US20010014996A1 - Wedge clamp type termination for elevator tension member - Google Patents
Wedge clamp type termination for elevator tension member Download PDFInfo
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- US20010014996A1 US20010014996A1 US09/845,866 US84586601A US2001014996A1 US 20010014996 A1 US20010014996 A1 US 20010014996A1 US 84586601 A US84586601 A US 84586601A US 2001014996 A1 US2001014996 A1 US 2001014996A1
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- Prior art keywords
- tension member
- termination device
- wedge
- set forth
- clamping surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/08—Arrangements of ropes or cables for connection to the cars or cages, e.g. couplings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/062—Belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/08—Arrangements of ropes or cables for connection to the cars or cages, e.g. couplings
- B66B7/085—Belt termination devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
- F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T24/00—Buckles, buttons, clasps, etc.
- Y10T24/39—Cord and rope holders
- Y10T24/3969—Sliding part or wedge
Definitions
- the present invention relates to elevator systems, and more particularly to tension members for such elevator systems.
- a conventional traction elevator system includes a car, a counterweight, two or more ropes interconnecting the car and counterweight, a traction sheave to move the ropes, and a machine to rotate the traction sheave.
- the ropes are formed from laid or twisted steel wire and the sheave is formed from cast iron.
- Wedge clamps operate by securing the elevator rope between opposed angled walls of the wedge clamps and a tear drop shaped wedge around which the cable is wound.
- the wedge acts to cam the rope against the walls of the wedge clamp during tensioning of the ropes.
- a benefit of this design is that the wedge may have a relatively sharp angle producing a large clamping force. Because the steel ropes have a high compressive strength the large clamping force has no deleterious effects on the rope such as crush or creep.
- the flat tension member includes a plurality of individual load carrying cords encased within a common layer of coating.
- An exemplary tension member of the type contemplated in this application is discussed in further detail in U.S. Ser. No. 09/031,108 filed Feb. 26, 1998 Entitled Tension Member For An Elevator and Continuation-In-Part Application Entitled Tension Member For An Elevator filed Dec. 22, 1998 under Attorney Docket No. 98-2143, both of which are entirely incorporated herein by reference.
- the coating layer surrounds and/or separates the individual cords and defines an engagement surface for engaging a traction sheave.
- the rope pressure may be distributed more uniformly throughout the tension member, traction is increased and smaller sheave diameters are possible.
- a method of terminating and securing flat tension members involves looping the members over a bar and clamping the end with a pair of plates. The plates are secured by a plurality of fasteners that pass through holes provided in the plates.
- Another method of terminating flat tension members includes a wedged end fastener wherein a wedge of material is positioned at the end of the tension member and clamped by a pair of plates. In such a configuration one of the plates comprises a wedge shaped cross section cooperating with the wedge of material and the second plate comprises a cross section of uniform thickness.
- the plates are similarly secured by a plurality of fasteners that pass through holes provided in the plates.
- a termination device for a tension member having a compressible outer coating has a wedge disposed in a socket having cooperating jaw surfaces. The rope is wrapped around the wedge and inserted with the socket and clamped therein by forces generated by the tension in the member and the cooperation of the wedge and jaw surfaces.
- a principal feature of the present invention is the geometry of the wedge, particularly the angle of the wedge, including its length and width.
- the wedge is sized and the angle is selected to provide sufficient clamping force to resist slippage of the rope without exceeding the compressive stress capability of the tension member.
- the wedge comprises a domed top portion to efficiently distribute the tension of the rope across the wedge.
- FIG. 1 is perspective view of an elevator system having a tension member termination device according to the present invention
- FIG. 2 is a perspective view of an embodiment of a termination clamp, showing an optional tension clamp device
- FIG. 3 is a cross sectional view of the embodiment shown in FIG. 2 taken substantially along lines 3 - 3 ;
- FIG. 4 is perspective view of an alternate embodiment showing a pivot block
- FIG. 5 is a cross sectional view of the embodiment shown in FIG. 4 taken substantially along lines 5 - 5 ;
- FIG. 6 is diagrammatic cross sectional view of a wedge, tension member and jaw surface showing the relevant geometries and forces;
- FIG. 7 is a perspective view of an embodiment of a wedge showing ridges and locking features
- FIG. 8 is a perspective view of a plate of the tension clamp of FIG. 2;
- FIG. 9 is a front plan view of a plate of the tension clamp of FIG. 8.
- FIG. 1 Illustrated in FIG. 1 is a traction elevator system 12 .
- the elevator system 12 includes a car 14 , a counterweight 16 , a traction drive 18 , and a machine 20 .
- the traction drive 18 includes a tension member 22 , interconnecting the car 14 and counterweight 16 , and a traction sheave 24 .
- the tension member 22 is engaged with the sheave 24 such that rotation of the sheave 24 moves the tension member 22 , and thereby the car 14 and counterweight 16 .
- Tension member 22 is coupled to counterweight 16 and car 14 by terminal clamp 30 .
- geared machine 20 it should be noted that this configuration is for illustrative purposes only, and the present invention may be used with geared or gearless machines.
- this too is by way of example and the present invention may be used with other types of tension members including round coated tension members.
- terminal clamp 30 An embodiment of terminal clamp 30 is illustrated in more detail in FIG. 2. Tension member 22 is wrapped around wedge 32 and disposed within socket 34 . Terminal clamp 30 is attached to car 14 and counterweight 16 via attachment rod 36 attached to socket 34 by pin 38 . Attachment rod 36 is coupled to counterweight 16 and car 14 by threaded nuts 40 secured in place by cotter pin 42 . Also shown in FIG. 2 is an optional gripping jaw clamp 50 wherein tension member 22 is clamped within grooves 52 , 54 of plates 56 , 58 in a double overlap arrangement.
- clamp 30 operates to provide a secure termination of tension member 22 .
- lead portion 44 of tension member 22 is inserted within aperture 46 in the bottom portion of socket 34 , as viewed in the figure, wrap portion 47 of the tension member is then wrapped around wedge 32 and then tail portion 48 passed back out through aperture 44 .
- Wedge 32 is then inserted within opening 60 of socket 34 to the clamp position shown in FIG. 2 wherein lead portion 44 and tail portion 48 are clamped between jaw surfaces 62 , 64 respectively, of socket 34 .
- Termination clamp 30 is designed such that tension member 22 and attachment rod 36 are substantially axially aligned to allow for efficient load transfer and prevents undesirable rotation of termination clamp.
- FIGS. 4 and 5 An alternative embodiment of termination clamp 30 is shown in FIGS. 4 and 5 wherein attachment rod 36 is attached to pivot block 72 by pin 38 an in turn pivotally attached to socket 34 by pivot pin 74 and secured by cotter pin 76 .
- lead portion 44 of tension member 22 is inserted within aperture 46 in the bottom portion of socket 34 , as viewed in the figure, wrap portion 47 of the tension member is then wrapped around wedge 32 and then tail portion 48 passed back out through aperture 44 .
- Wedge 32 is then inserted within opening 60 of socket 34 to the clamp position shown in FIG. 5 wherein lead portion 44 and tail portion 48 are clamped between jaw surfaces 62 , 64 respectively, of socket 34 .
- pivot block 72 is then installed to prevent the wedge from being inadvertently dislodged from the socket if tension is lost in the member, as will be more fully described hereinbelow.
- this particular embodiment maintains tension member 22 and attachment rod 36 substantially axially aligned to allow for efficient load transfer.
- Pivot block 72 also permits angular displacement of tension member 22 relative to the car 14 or counterweight 16 without imparting large stresses within attachment rod 36 or socket 34 .
- Another advantage of this particular embodiment over that shown in FIGS. 2 and 3 is that the overall height the socket is reduced because the wedge 32 is inserted through the top of socket 34 . Pivot block 72 is then inserted within close proximity of the wedge thus reducing the overall height of termination clamp 30 .
- the geometry of wedge 32 is an important factor in producing normal forces 68 , 70 and properly retaining tension member 22 .
- the relevant parameters of wedge 32 controlling the normal force F n are shown with reference to FIG. 6 and include the length (L) designated by 78 , depth (d) represented by 80 , angle ⁇ represented by 82 and measured from centerline 83 to clamping surface 33 , 35 and the width (W) of tension member 22 (FIG. 2).
- the other factor relevant to controlling the normal forces 68 , 70 is the tension (T) in tension member 22 represented by 66 .
- the parameters L and d are somewhat dependant on ⁇ and are typically limited by available space in the hoistway (not shown). Given a nominal tension T, normal forces F n 68 , 70 (FIGS.
- tension member 22 is comprised of a urethane outer coating, or where the coating is another flexible elastomer, as they have a maximum compressive stress ( ⁇ c) capability of about 5 MPa before non-recoverable deformation, or creep, occurs.
- ⁇ c maximum compressive stress
- d ranges from about 60 mm to about 70 mm
- L is about 140 mm
- ⁇ ranges from about 9 degrees to about 10 degrees.
- a typical tension member 22 is comprised of a 30 mm wide flat flexible rope having a urethane outer coating and has a maximum tension capability of 30,000 N.
- a safety factor of about 12 is applied to elevator ropes and provides a maximum tension in member 22 of about 2500 N.
- Wedge 32 has length L of 140 mm and angle ⁇ of 10 degrees geometrically yielding diameter d as follows:
- the compressive stress limit of the material is not exceeded and therefore no creep will occur.
- termination clamp 30 to react out T in lead section 44 is important and is a function of F n and the coefficient of friction ( ⁇ ) between the tension member 22 and jaw surface 62 and the surface of wedge 32 .
- To properly maintain wedge 32 within socket 34 T must be preferably substantially reacted out within lead section 44 although a remainder may be transferred into wrap section 47 .
- An alternative embodiment of the present invention aimed at increasing the coefficient of friction between the tension member 22 and the jaw surface 62 , 64 and wedge 32 comprises a roughened surface on the jaws and the wedge.
- the surface is roughened by a sandblasting procedure. Sandblasting of the surfaces raises the coefficient of friction to 0.35 or greater.
- Other methods of increasing the surface friction include etching, machining, knurling and other suitable equivalents. In addition to raising the coefficient of friction the roughened surfaces would form small ridges and valleys.
- a characteristic of the urethane coating is its tendency to exhibit cold flow under high loading conditions.
- the urethane coating cold flows into and around the ridges and valleys, also referred to as locking features, in the wedge and socket and provides for a small but effective mechanical lock.
- the locking features increase the ability of the termination clamp to resist slippage of tension member 22 .
- the locking features may comprise grooves, striations 83 (FIG. 7), cuts, diamond pattern, or other suitable equivalents. It is important to note that the locking features reduce the required normal force as described hereinabove.
- the use of locking features as describes allows a reduction in the length L, or an increase in angle ⁇ to further minimize the risk of creep.
- FIG. 7 An alternative embodiment for wedge 32 is shown in FIG. 7 and includes ridges 84 , 86 forming a channel 88 therebetween.
- Ridges 84 , 86 are approximately the height of a cord within the coating of tension member 22 .
- a particular embodiment of tension member 22 is 3 mm thick having a cord with a 1.4 mm cord disposed therein.
- Ridges 84 , 86 for this particular embodiment would define a channel 88 having a depth of approximately 1 mm.
- Tension member 22 is disposed within channel 88 and wedge 32 is installed within socket 34 as described herein above.
- the benefit of ridges 84 , 86 are that they contain tension member 22 within channel 88 given the anticipated cold flow characteristics of the coating material.
- ridges 84 , 86 are sized to prevent compressive stress failure of tension member 22 by limiting the displacement of wedge 32 within socket 34 . In the event that a higher than anticipated normal force F n is transferred to the member ridges 84 , 86 will contact jaw surfaces 62 , 64 and arrest the travel of wedge 32 within socket 64 .
- tension clamp 50 for use with the termination clamp 30 is illustrated.
- the purpose of tension clamp 50 is to aid in terminating and reacting tension in member 22 and to equalize the tension between lead portion 44 and tail portion 48 as they enter socket 34 .
- Tension clamp 50 also assists termination clamp 30 in the unlikely event of that tension member 22 loses tension, such as for instance, during an abrupt stop of elevator car 14 .
- Tension clamp 50 is clamped onto the tail portion 48 and lead portion 44 prior to entering socket 34 . When engaged with the tension member 22 , tension clamp 50 cannot move thereon.
- Plates 56 , 58 as shown and described are identical, however it is within the scope of the present invention that the plates are different wherein one plate has a tension member groove and one plate has no groove.
- tension clamp 50 comprises a pair of plates 56 , 58 each having a tension member groove 52 , 54 approximately the thickness of the tension member 22 .
- Bore holes 51 are provided for through passage of fasteners 53 .
- Plates 56 , 58 further include leading edges 55 comprising a generous radius to facilitate a smooth transition of lead portion 44 and tail portion 48 from socket 34 into tension clamp 50 .
- the lead portion 44 is inserted into groove 52 of plate 56 and tail portion 48 into groove 54 of plate 58 and the plates are assembled together with fasteners 53 .
- the bolts 53 are tightened tension member 22 is clamped within the grooves 52 , 54 and are held resistant to slippage by plates 56 , 58 . In this way the tension member is prevented from moving relative to tension clamp 50 .
Abstract
A tension member termination device optimized for terminating flat tension members having compressible outer coatings, the device including a wedge and a socket each having cooperating surfaces positioned at a predetermined angle for clamping the tension member therebetween. The angle reliably secures the tension member while avoiding deleterious pressure and stress upon the tension member. The invention also provides a safety clamp for optional use with the tension member termination device.
Description
- The present invention relates to elevator systems, and more particularly to tension members for such elevator systems.
- A conventional traction elevator system includes a car, a counterweight, two or more ropes interconnecting the car and counterweight, a traction sheave to move the ropes, and a machine to rotate the traction sheave. The ropes are formed from laid or twisted steel wire and the sheave is formed from cast iron.
- Although conventional steel ropes and cast iron sheaves have proven very reliable and cost effective, there are limitations on their use. One such limitation is the traction forces between the ropes and the sheave. Typical techniques to increase the traction forces between the ropes and sheave result in reducing the durability of the ropes, increasing wear or the increasing rope pressure.
- Another limitation on the use of steel ropes is the flexibility and fatigue characteristics of steel wire ropes. The minimum diameter of a steel rope is dictated mostly by fatigue requirements and results in a relatively thick rope. The relatively thick cross section of a steel rope reduces its inherent flexibility necessitating a sheave having a relatively large diameter. The larger the sheave diameter, the greater torque required from the machine to drive the elevator system thereby increasing the size and cost of the elevator system.
- Another drawback of conventional round ropes is that smaller sheave diameters increase rope pressure shortening the life of the rope. Rope pressure is generated as the rope travels over the sheave and is directly proportional to the tension in the rope and inversely proportional to the sheave diameter D and the rope diameter. In addition, the shape of the sheave grooves, including such traction enhancing techniques as undercutting the sheave grooves, further increases the maximum rope pressure to which the rope is subjected.
- In a typical rope driven elevator installation rope wedge clamps are used for termination purposes. Wedge clamps operate by securing the elevator rope between opposed angled walls of the wedge clamps and a tear drop shaped wedge around which the cable is wound. The wedge acts to cam the rope against the walls of the wedge clamp during tensioning of the ropes. A benefit of this design is that the wedge may have a relatively sharp angle producing a large clamping force. Because the steel ropes have a high compressive strength the large clamping force has no deleterious effects on the rope such as crush or creep.
- In attempts to overcome the deficiencies and drawbacks of conventional round steel ropes for use in elevator systems coated tension members, including a relatively flat tension member, has been developed. The flat tension member includes a plurality of individual load carrying cords encased within a common layer of coating. An exemplary tension member of the type contemplated in this application is discussed in further detail in U.S. Ser. No. 09/031,108 filed Feb. 26, 1998 Entitled Tension Member For An Elevator and Continuation-In-Part Application Entitled Tension Member For An Elevator filed Dec. 22, 1998 under Attorney Docket No. 98-2143, both of which are entirely incorporated herein by reference.
- The coating layer surrounds and/or separates the individual cords and defines an engagement surface for engaging a traction sheave. As a result of the configuration of the tension member, the rope pressure may be distributed more uniformly throughout the tension member, traction is increased and smaller sheave diameters are possible.
- A method of terminating and securing flat tension members involves looping the members over a bar and clamping the end with a pair of plates. The plates are secured by a plurality of fasteners that pass through holes provided in the plates. Another method of terminating flat tension members includes a wedged end fastener wherein a wedge of material is positioned at the end of the tension member and clamped by a pair of plates. In such a configuration one of the plates comprises a wedge shaped cross section cooperating with the wedge of material and the second plate comprises a cross section of uniform thickness. The plates are similarly secured by a plurality of fasteners that pass through holes provided in the plates. A drawback to these types of termination methods is that the tension carrying capability of the termination relies solely on the clamping forces provided by the fasteners. In addition, the wedge type fastener limits the termination point of the member and hampers adjustability.
- The above art notwithstanding, scientists and engineers under the direction of Applicants' Assignee are working to develop more efficient and durable methods and apparatus to drive elevator systems.
- According to the present invention, a termination device for a tension member having a compressible outer coating has a wedge disposed in a socket having cooperating jaw surfaces. The rope is wrapped around the wedge and inserted with the socket and clamped therein by forces generated by the tension in the member and the cooperation of the wedge and jaw surfaces.
- A principal feature of the present invention is the geometry of the wedge, particularly the angle of the wedge, including its length and width. The wedge is sized and the angle is selected to provide sufficient clamping force to resist slippage of the rope without exceeding the compressive stress capability of the tension member. In addition, the wedge comprises a domed top portion to efficiently distribute the tension of the rope across the wedge.
- FIG. 1 is perspective view of an elevator system having a tension member termination device according to the present invention;
- FIG. 2 is a perspective view of an embodiment of a termination clamp, showing an optional tension clamp device;
- FIG. 3 is a cross sectional view of the embodiment shown in FIG. 2 taken substantially along lines3-3;
- FIG. 4 is perspective view of an alternate embodiment showing a pivot block;
- FIG. 5 is a cross sectional view of the embodiment shown in FIG. 4 taken substantially along lines5-5;
- FIG. 6 is diagrammatic cross sectional view of a wedge, tension member and jaw surface showing the relevant geometries and forces;
- FIG. 7 is a perspective view of an embodiment of a wedge showing ridges and locking features;
- FIG. 8 is a perspective view of a plate of the tension clamp of FIG. 2; and
- FIG. 9 is a front plan view of a plate of the tension clamp of FIG. 8.
- Illustrated in FIG. 1 is a
traction elevator system 12. Theelevator system 12 includes acar 14, acounterweight 16, atraction drive 18, and amachine 20. Thetraction drive 18 includes atension member 22, interconnecting thecar 14 andcounterweight 16, and atraction sheave 24. Thetension member 22 is engaged with thesheave 24 such that rotation of thesheave 24 moves thetension member 22, and thereby thecar 14 andcounterweight 16.Tension member 22 is coupled tocounterweight 16 andcar 14 byterminal clamp 30. Although shown as a gearedmachine 20, it should be noted that this configuration is for illustrative purposes only, and the present invention may be used with geared or gearless machines. In addition, although shown as a relativelyflat tension member 22, it should be noted that this too is by way of example and the present invention may be used with other types of tension members including round coated tension members. - An embodiment of
terminal clamp 30 is illustrated in more detail in FIG. 2.Tension member 22 is wrapped aroundwedge 32 and disposed withinsocket 34.Terminal clamp 30 is attached tocar 14 andcounterweight 16 viaattachment rod 36 attached tosocket 34 bypin 38.Attachment rod 36 is coupled tocounterweight 16 andcar 14 by threadednuts 40 secured in place bycotter pin 42. Also shown in FIG. 2 is an optionalgripping jaw clamp 50 whereintension member 22 is clamped withingrooves plates - Referring to FIG. 3
clamp 30 operates to provide a secure termination oftension member 22. In use,lead portion 44 oftension member 22 is inserted withinaperture 46 in the bottom portion ofsocket 34, as viewed in the figure,wrap portion 47 of the tension member is then wrapped aroundwedge 32 and thentail portion 48 passed back out throughaperture 44.Wedge 32 is then inserted within opening 60 ofsocket 34 to the clamp position shown in FIG. 2 whereinlead portion 44 andtail portion 48 are clamped between jaw surfaces 62, 64 respectively, ofsocket 34.Termination clamp 30 is designed such thattension member 22 andattachment rod 36 are substantially axially aligned to allow for efficient load transfer and prevents undesirable rotation of termination clamp. - Still referring to FIG. 3, in normal operation of the elevator system12 (FIG. 1), the tension (T) in
lead portion 44 oftension member 22 is in the direction indicated byarrow 66 which reacts inwrap portion 47 to forcewedge 32 farther intosocket 34 in the direction ofaperture 46. With the load intension member 22 forcingwedge 32 intosocket 34, a clamping force represented byarrow 68 clamps leadportion 44 againstjaw surface 62 and a clamping force represented byarrow 70clamps tail portion 48 againstjaw surface 64. Clampingforces jaws wedge 32 and are expressed as normal forces (Fn). The clamping forces generated byjaws wrap portion 47, react out the total tension (T) intension member 22 thereby retaining the member inclamp 30. - An alternative embodiment of
termination clamp 30 is shown in FIGS. 4 and 5 whereinattachment rod 36 is attached to pivotblock 72 bypin 38 an in turn pivotally attached tosocket 34 bypivot pin 74 and secured bycotter pin 76. In this particular embodiment,lead portion 44 oftension member 22 is inserted withinaperture 46 in the bottom portion ofsocket 34, as viewed in the figure, wrapportion 47 of the tension member is then wrapped aroundwedge 32 and thentail portion 48 passed back out throughaperture 44.Wedge 32 is then inserted within opening 60 ofsocket 34 to the clamp position shown in FIG. 5 whereinlead portion 44 andtail portion 48 are clamped between jaw surfaces 62, 64 respectively, ofsocket 34. It is an important feature of this embodiment that oncewedge 32 andtension member 22 are installed withinsocket 34pivot block 72 is then installed to prevent the wedge from being inadvertently dislodged from the socket if tension is lost in the member, as will be more fully described hereinbelow. In addition, this particular embodiment maintainstension member 22 andattachment rod 36 substantially axially aligned to allow for efficient load transfer.Pivot block 72 also permits angular displacement oftension member 22 relative to thecar 14 orcounterweight 16 without imparting large stresses withinattachment rod 36 orsocket 34. Another advantage of this particular embodiment over that shown in FIGS. 2 and 3 is that the overall height the socket is reduced because thewedge 32 is inserted through the top ofsocket 34.Pivot block 72 is then inserted within close proximity of the wedge thus reducing the overall height oftermination clamp 30. - The geometry of
wedge 32 is an important factor in producingnormal forces tension member 22. The relevant parameters ofwedge 32 controlling the normal force Fn are shown with reference to FIG. 6 and include the length (L) designated by 78, depth (d) represented by 80, angle φ represented by 82 and measured fromcenterline 83 to clampingsurface normal forces tension member 22 represented by 66. The parameters L and d are somewhat dependant on φ and are typically limited by available space in the hoistway (not shown). Given a nominal tension T,normal forces F n 68, 70 (FIGS. 3 and 5) are inversely related to φ. That is to say, if φ is too small, Fn will be too great andtension member 22 will experience compressive creep. This is particularly important in an embodiment wheretension member 22 is comprised of a urethane outer coating, or where the coating is another flexible elastomer, as they have a maximum compressive stress (σc) capability of about 5 MPa before non-recoverable deformation, or creep, occurs. On the other hand if φ is too large the normal forces will be too small the tension member will slip withintermination clamp 30. It is particularly advantageous to reduce the compressive stress ontension member 22. One way to reduce the compressive stress is to increase the length L over which the clamping forces are applied, however hoistway consideration are generally limiting in this regard. Taking the above referenced physical parameters in to consideration, in order to preclude exceeding σc the minimum φ can be predetermined in accordance with the formula: - φ=tan−1 [T/(σc *L*W)]
- In a typical application of the present invention for a tension member having a T of about 2500 N, d ranges from about 60 mm to about 70 mm, L is about 140 mm, φ ranges from about 9 degrees to about 10 degrees.
- The present invention will now be described with respect to a specific example of the
termination clamp 30 shown in FIGS. 4 and 5 by referring to FIG. 6. Atypical tension member 22, as described in the above related applications, is comprised of a 30 mm wide flat flexible rope having a urethane outer coating and has a maximum tension capability of 30,000 N. As is known in the art, a safety factor of about 12 is applied to elevator ropes and provides a maximum tension inmember 22 of about 2500N. Wedge 32 has length L of 140 mm and angle φ of 10 degrees geometrically yielding diameter d as follows: - d=2(L tan φ)=2(140 tan 20/2))=49.37 mm
- The determination of Fn with T equal to 2500 N is as follows:
- F n =T/sin φ=2500/sin (20/2)=14,397 N
- Since Fn is distributed over the entire area of
lead portion 44 the compressive stress σ on thetension member 22 is a function of the area of lead portion, A, clamped betweenwedge 32jaw surface 32, and is calculated as follows: - A=L*W=140*30=4,200 mm2
- The compressive stress in
tension member 22 is then determined as follows: - σF n /A=14,397/4,200=3.43 MPa
- In this particular example, the compressive stress limit of the material is not exceeded and therefore no creep will occur.
- The ability of
termination clamp 30 to react out T inlead section 44 is important and is a function of Fn and the coefficient of friction (μ) between thetension member 22 andjaw surface 62 and the surface ofwedge 32. In the example given,tension member 22 is comprised of a urethane coating andjaw surface 62, as well aswedge 32, is smooth steel and a conservative number for the coefficient friction between the surfaces is about μ=0.25. To properly maintainwedge 32 within socket 34 T must be preferably substantially reacted out withinlead section 44 although a remainder may be transferred intowrap section 47. The following relation, from clamping theory, provides the maximum reaction force Fr, or the amount of tension that can be reacted, in the example given for μ=0.25: - F r =μ*F n=0.25*14,397=3,599 N
- Therefore, recalling that the maximum T in the example given is 2500 N, all of the tension T will be reacted out of
tension member 22 in thelead portion 44 and the member will not slip withintermination clamp 30. - An alternative embodiment of the present invention aimed at increasing the coefficient of friction between the
tension member 22 and thejaw surface wedge 32 comprises a roughened surface on the jaws and the wedge. In one particular embodiment the surface is roughened by a sandblasting procedure. Sandblasting of the surfaces raises the coefficient of friction to 0.35 or greater. Other methods of increasing the surface friction include etching, machining, knurling and other suitable equivalents. In addition to raising the coefficient of friction the roughened surfaces would form small ridges and valleys. A characteristic of the urethane coating is its tendency to exhibit cold flow under high loading conditions. Under the loading conditions described above the urethane coating cold flows into and around the ridges and valleys, also referred to as locking features, in the wedge and socket and provides for a small but effective mechanical lock. The locking features increase the ability of the termination clamp to resist slippage oftension member 22. It is within the scope of the present invention that the locking features may comprise grooves, striations 83 (FIG. 7), cuts, diamond pattern, or other suitable equivalents. It is important to note that the locking features reduce the required normal force as described hereinabove. The use of locking features as describes allows a reduction in the length L, or an increase in angle φ to further minimize the risk of creep. - An alternative embodiment for
wedge 32 is shown in FIG. 7 and includesridges channel 88 therebetween.Ridges tension member 22. For example, a particular embodiment oftension member 22 is 3 mm thick having a cord with a 1.4 mm cord disposed therein.Ridges channel 88 having a depth of approximately 1 mm.Tension member 22 is disposed withinchannel 88 andwedge 32 is installed withinsocket 34 as described herein above. The benefit ofridges tension member 22 withinchannel 88 given the anticipated cold flow characteristics of the coating material. In addition,ridges tension member 22 by limiting the displacement ofwedge 32 withinsocket 34. In the event that a higher than anticipated normal force Fn is transferred to themember ridges wedge 32 withinsocket 64. - Referring now to FIGS. 2, 8 and9, the above mentioned
optional tension clamp 50 for use with thetermination clamp 30 is illustrated. The purpose oftension clamp 50 is to aid in terminating and reacting tension inmember 22 and to equalize the tension betweenlead portion 44 andtail portion 48 as they entersocket 34.Tension clamp 50 also assiststermination clamp 30 in the unlikely event of thattension member 22 loses tension, such as for instance, during an abrupt stop ofelevator car 14.Tension clamp 50 is clamped onto thetail portion 48 andlead portion 44 prior to enteringsocket 34. When engaged with thetension member 22,tension clamp 50 cannot move thereon.Plates - As described
hereinabove tension clamp 50 comprises a pair ofplates tension member groove tension member 22. Bore holes 51 are provided for through passage offasteners 53.Plates edges 55 comprising a generous radius to facilitate a smooth transition oflead portion 44 andtail portion 48 fromsocket 34 intotension clamp 50. - In use, the
lead portion 44 is inserted intogroove 52 ofplate 56 andtail portion 48 intogroove 54 ofplate 58 and the plates are assembled together withfasteners 53. When thebolts 53 are tightenedtension member 22 is clamped within thegrooves plates tension clamp 50. - When
optional tension clamp 50 is used in conjunction withtermination clamp 30, leadingportion 44 andtail portion 48 load share the full tension created bycar 14. In this regard, the analysis for determining the clamping performance established herein above is modified to reflect a load sharing in the tension in each of the cables. - While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.
Claims (27)
1. A termination device for a tension member comprising:
a socket having at least one jaw surface; and
a wedge having a centerline and at least one clamping surface positioned at a predetermined angle from the centerline, the wedge disposed within the socket with the at least one clamping surface juxtaposed to the jaw surface.
2. The termination device as set forth in wherein the tension member is disposed between the clamping surface and the jaw surface.
claim 1
3. The termination device as set forth in wherein the tension member includes a tensile force providing a normal force between the clamping surface and the jaw surface clamping the tension member therebetween.
claim 2
4. The termination device as set forth in wherein the tensile force is T, the predetermined angle is φ, and the normal force is Fn and is provided in accordance with the formula: Fn=T/tan φ
claim 3
5. The termination device as set forth in wherein the clamping surface includes a length, L, the tension member has a width, W, and includes a maximum compressive stress capability, σc, and wherein the minimum predetermined angle is determined in accordance with the formula:
claim 4
φ=tan−1(T/(σc *L*W))
6. The termination device as set forth in wherein the tension member is comprised of a inner load carrying member comprised of a first material and an outer portion comprised of a second material, wherein the outer portion defines a traction surface for the tension member, and wherein the normal force produces a stress less than the maximum compressive stress capability of the outer portion.
claim 5
7. The termination device as set forth in wherein the compressive stress capability of the outer material limits L and φ.
claim 6
8. The termination device as set forth in maximum compressive stress capability of the outer material is from about 2.5 MPa to about 5 MPa.
claim 7
9. The termination device as set force wherein the predetermined angle ranges from about 9 degrees to about 10 degrees and the length is about 140 mm.
claim 5
10. The termination device as set forth in wherein the tension member comprises a substantially round cross sectional shape or a substantially rectangular cross sectional shape.
claim 1
11. The termination device as set forth in wherein the tension member comprises a substantially rectangular cross section having a lead portion, a wrap portion and a tail portion, the at least one jaw surface comprises a first jaw surface and a second jaw surface, the at least one clamping surface comprises a first clamping surface and a second clamping surface positioned on either side of a plane passing through the centerline, the wedge further comprises a wrap section comprising a semi-circular shape disposed substantially tangentially between the first clamping surface and the second clamping surface, and wherein the lead portion is disposed between the first clamping surface and the first jaw surface, the wrap portion is disposed on the wrap section and the tail portion is disposed between the second clamping surface and the second jaw surface.
claim 3
12. The termination device as set forth in wherein the semicircular shape has a diameter ranging from about 60 mm to about 70 mm.
claim 11
13. The termination device as set forth in wherein the socket has an aperture and an opening further and wherein the lead portion and the tail portion extend through the aperture and the wedge is disposed within the opening.
claim 11
14. The termination device as set forth in wherein the wedge comprises a pair of ridges positioned orthogonally at each edge of the first and second clamping surfaces defining a channel therebetween receiving the tension member and contacting the jaw surface and limiting the normal force thereof.
claim 11
15. The termination device as set forth in further comprising a connecting rod attached to the socket in axial alignment with the aperture.
claim 13
16. The termination device as set forth in further comprising a pivot block pivotally connected to the socket and wherein the connecting rod is attached to the pivot block.
claim 15
17. A termination device as set forth in wherein at least one of the clamping surface and the jaw surface is textured to increase the coefficient of friction thereof.
claim 1
18. A termination device as set forth in wherein at least one of the clamping surface and the jaw surface includes locking features to mechanically lock the tension member therein.
claim 3
19. A wedge and socket termination device for a tension member, the wedge having a clamping surface includes a length, L, and an angle φ, the tension member having a tensile force, T, a width, W, and includes a maximum compressive stress capability, σc, and wherein the length, and angle are related in accordance with the formula:
φ=tan−1(T/(σc *L*W)
20. An elevator system having an elevator car, a counterweight and a tension member extending between the counterweight and the elevator car, the tension member being terminated to at least one of the car and the counterweight by a termination device comprising:
a socket having at least one jaw surface;
a wedge having a centerline and at least one clamping surface positioned at a predetermined angle from the centerline, the wedge disposed within the socket with the at least one clamping surface juxtaposed to the jaw surface and the tension member disposed between the clamping surface and the jaw surface; and
a connecting rod attaching the termination device to at least one of the car and the counterweight.
21. An elevator system as set forth in wherein the tension member comprises a substantially rectangular cross section having a lead portion, a wrap portion and a tail portion, the at least one jaw surface comprises a first jaw surface and a second jaw surface, the at least one clamping surface comprises a first clamping surface and a second clamping surface positioned on either side of a plane passing through the centerline, the wedge further comprises a wrap section comprising a semi-circular shape disposed substantially tangentially between the first clamping surface and the second clamping surface, and wherein the lead portion is disposed between the first clamping surface and the first jaw surface, the wrap portion is disposed on the wrap section and the tail portion is disposed between the second clamping surface and the second jaw surface.
claim 17
22. A tension clamp for clamping a lead portion and a tail portion of a tension member in a double overlap arrangement, the tension clamp comprising:
a first plate having a groove disposed therein receiving the lead portion and a second plate having a groove disposed therein receiving the tail portion; and
at least one fastener hole in each of the first and second plates receiving a fastener and clamping the lead portion and the tail portion therebetween.
23. The tension clamp as set forth in wherein the plates are generally planar and wherein at least one of the ends of the plates include a leading edge comprised of curved portion.
claim 19
24. An elevator system having an elevator car, a counterweight and a tension member extending between the counterweight and the elevator car, the tension member having a lead portion and a tail portion being terminated to at least one of the car and the counterweight by a wedge and socket termination device and including a tension clamp comprising:
a first plate having a groove disposed therein receiving the lead portion;
a second plate having a groove disposed therein receiving the tail portion; and
at least one fastener hole in each of the first and second plates receiving a fastener and clamping the lead portion and the tail portion therebetween in a double overlap arrangement.
25. A method for terminating a tension member comprising:
feeding the tension member into an aperture of a socket;
wrapping the tension member around a wedge;
feeding the tension member back through the aperture;
applying a tensile force in the tension member; and
compressing the tension member between the wedge and the socket.
26. A method according to wherein the compressing comprises compressing the tension member to a stress level below the maximum compressive stress capability of the tension member
claim 25
27. A method according to further comprising:
claim 25
positioning the tension member in a back-to-back arrangement;
placing a pair of plates on either side of the tension member;
inserting a plurality of fasteners through the plates;
tightening the fasteners; and
clamping the tension member between the plates in a double overlap arrangement.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/845,866 US6357085B2 (en) | 1998-12-31 | 2001-04-30 | Wedge clamp type termination for elevator tension member |
US10/805,490 USRE47035E1 (en) | 1998-12-31 | 2004-03-19 | Wedge clamp type termination for elevator tension member |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/224,045 US6256841B1 (en) | 1998-12-31 | 1998-12-31 | Wedge clamp type termination for elevator tension member |
US09/845,866 US6357085B2 (en) | 1998-12-31 | 2001-04-30 | Wedge clamp type termination for elevator tension member |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/224,045 Division US6256841B1 (en) | 1998-02-26 | 1998-12-31 | Wedge clamp type termination for elevator tension member |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/805,490 Reissue USRE47035E1 (en) | 1998-12-31 | 2004-03-19 | Wedge clamp type termination for elevator tension member |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010014996A1 true US20010014996A1 (en) | 2001-08-23 |
US6357085B2 US6357085B2 (en) | 2002-03-19 |
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Application Number | Title | Priority Date | Filing Date |
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US09/224,045 Expired - Lifetime US6256841B1 (en) | 1998-02-26 | 1998-12-31 | Wedge clamp type termination for elevator tension member |
US09/845,866 Ceased US6357085B2 (en) | 1998-12-31 | 2001-04-30 | Wedge clamp type termination for elevator tension member |
US10/805,490 Expired - Lifetime USRE47035E1 (en) | 1998-12-31 | 2004-03-19 | Wedge clamp type termination for elevator tension member |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/224,045 Expired - Lifetime US6256841B1 (en) | 1998-02-26 | 1998-12-31 | Wedge clamp type termination for elevator tension member |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/805,490 Expired - Lifetime USRE47035E1 (en) | 1998-12-31 | 2004-03-19 | Wedge clamp type termination for elevator tension member |
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US (3) | US6256841B1 (en) |
EP (1) | EP1140689B1 (en) |
JP (2) | JP4741730B2 (en) |
KR (1) | KR100826423B1 (en) |
BR (1) | BR9916482A (en) |
DE (3) | DE29924824U1 (en) |
ES (1) | ES2230916T3 (en) |
RU (1) | RU2248929C2 (en) |
WO (1) | WO2000040497A1 (en) |
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- 1999-12-17 BR BR9916482-5A patent/BR9916482A/en not_active IP Right Cessation
- 1999-12-17 KR KR1020017008220A patent/KR100826423B1/en active IP Right Grant
- 1999-12-17 WO PCT/US1999/030227 patent/WO2000040497A1/en active IP Right Grant
- 1999-12-17 DE DE29924824U patent/DE29924824U1/en not_active Expired - Lifetime
- 1999-12-17 DE DE29924841U patent/DE29924841U1/en not_active Expired - Lifetime
- 1999-12-17 DE DE69920961T patent/DE69920961T2/en not_active Revoked
-
2001
- 2001-04-30 US US09/845,866 patent/US6357085B2/en not_active Ceased
-
2004
- 2004-03-19 US US10/805,490 patent/USRE47035E1/en not_active Expired - Lifetime
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2011
- 2011-03-31 JP JP2011077276A patent/JP5341125B2/en not_active Expired - Lifetime
Cited By (21)
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US7695457B2 (en) * | 2000-02-02 | 2010-04-13 | Nemoto Kyorindo Co., Ltd. | Syringe barrel with roughened surface |
US20040087909A1 (en) * | 2000-02-10 | 2004-05-06 | Shigeru Nemoto | Syringe barrel with reinforcing rib |
US20040087910A1 (en) * | 2000-02-10 | 2004-05-06 | Shigeru Nemoto | Syringe barrel with roughened surface |
US7264612B2 (en) | 2000-02-10 | 2007-09-04 | Nemoto Kyorindo Co., Ltd. | Syringe barrel with guide |
US20040082919A1 (en) * | 2000-02-10 | 2004-04-29 | Shigeru Nemoto | Cylinder holder for a syringe barrel with rear surface projection |
US7344520B2 (en) | 2000-02-10 | 2008-03-18 | Nemoto Kyorindo Co Ltd | Syringe barrel with reinforcing rib |
US7393341B2 (en) | 2000-02-10 | 2008-07-01 | Shigeru Nemoto | Cylinder holder for a syringe barrel with rear surface projection |
WO2004069716A1 (en) * | 2003-01-28 | 2004-08-19 | Thyssen Elevator Capital Corp. | Termination device for an aramid-based elevator rope |
US6854164B2 (en) | 2003-01-28 | 2005-02-15 | Thyssen Elevator Capital Corp | Termination device for an aramid-based elevator rope |
CN1304265C (en) * | 2003-08-12 | 2007-03-14 | 因温特奥股份公司 | Elevator installation with a rocker device and rocker device for use in an elevator installation |
AU2005209671B2 (en) * | 2004-09-13 | 2011-07-14 | Inventio Ag | Belt end connection for fastening a belt end in a lift installation, and method for protecting and checking a belt end connection in a lift installation |
US20090127032A1 (en) * | 2004-09-13 | 2009-05-21 | Ernst Ach | Belt end connection for fastening a belt end in an elevator installation, and method for protecting and checking a belt end connection in an elevator installation |
US7740113B2 (en) * | 2004-09-13 | 2010-06-22 | Inventio Ag | Belt end connection for an elevator installation |
EP1886957A1 (en) | 2006-08-11 | 2008-02-13 | Inventio Ag | Lift belt for a lift system and method for manufacturing such a lift belt |
US20100178150A1 (en) * | 2006-08-16 | 2010-07-15 | Fargo Richard N | Elevator belt installation assembly and method of installing a belt |
DE202008001786U1 (en) | 2007-03-12 | 2008-12-24 | Inventio Ag | Elevator installation, suspension element for an elevator installation and device for producing a suspension element |
WO2012108872A1 (en) * | 2011-02-11 | 2012-08-16 | Otis Elevator Company | Termination assembly |
US9126805B2 (en) | 2012-02-13 | 2015-09-08 | Kone Corporation | Rope of an elevator and a method for manufacturing the rope |
US9868616B2 (en) | 2012-08-14 | 2018-01-16 | Mitsubishi Electric Corporation | Double-deck elevator |
US20150232302A1 (en) * | 2014-02-19 | 2015-08-20 | Kone Corporation | Elevator |
US9902595B2 (en) * | 2014-02-19 | 2018-02-27 | Kone Corporation | Elevator |
Also Published As
Publication number | Publication date |
---|---|
JP2011158095A (en) | 2011-08-18 |
US6357085B2 (en) | 2002-03-19 |
JP2002534644A (en) | 2002-10-15 |
EP1140689B1 (en) | 2004-10-06 |
DE69920961T2 (en) | 2005-11-17 |
DE29924824U1 (en) | 2006-03-16 |
US6256841B1 (en) | 2001-07-10 |
JP4741730B2 (en) | 2011-08-10 |
JP5341125B2 (en) | 2013-11-13 |
DE69920961D1 (en) | 2004-11-11 |
WO2000040497A1 (en) | 2000-07-13 |
KR100826423B1 (en) | 2008-04-29 |
ES2230916T3 (en) | 2005-05-01 |
EP1140689A1 (en) | 2001-10-10 |
DE29924841U1 (en) | 2006-03-09 |
USRE47035E1 (en) | 2018-09-11 |
BR9916482A (en) | 2001-11-06 |
KR20010092764A (en) | 2001-10-26 |
RU2248929C2 (en) | 2005-03-27 |
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