CA2178769C - Pipe junction holder with a novel torque-limiting device - Google Patents
Pipe junction holder with a novel torque-limiting device Download PDFInfo
- Publication number
- CA2178769C CA2178769C CA002178769A CA2178769A CA2178769C CA 2178769 C CA2178769 C CA 2178769C CA 002178769 A CA002178769 A CA 002178769A CA 2178769 A CA2178769 A CA 2178769A CA 2178769 C CA2178769 C CA 2178769C
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- CA
- Canada
- Prior art keywords
- bolt
- flange
- shank
- threaded
- threaded portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/06—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means comprising radial locking means
- F16L25/065—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means comprising radial locking means the locking means being actuated by radial screws
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/63—Frangible connections
-
- 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
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7041—Interfitted members including set screw
Abstract
Thus, the present invention provides a nut and bolt assembly having a lower threaded end and opposing upper threaded end. A first flange seats above the lower threaded end and an upper flange seats below the upper threaded end. A weak point having a known torque limit is provided below the upper flange. A nut is mounted on the upper threaded end. When the nut is turned beyond the torque limit of the weak point, it causes the bolt to break at the weak point. The bolt of the present invention is relatively inexpensive to make and use. It is designed preferably to be used in conjunction with a pressing member and a pipe junction holder for holding a pair of joined pipes.
Description
~ %87b~
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates generally to mechanical joint restraint devices and more particularly to a novel torque-limiting nut and bolt for clamping a pipe junction holder to a pair of axially coupled pipes and other mechanical joint fittings .
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates generally to mechanical joint restraint devices and more particularly to a novel torque-limiting nut and bolt for clamping a pipe junction holder to a pair of axially coupled pipes and other mechanical joint fittings .
2. Description of the Related Art Several types of pipe junction holders (mechanical restraint devices) are known in the art. A frequently used pipe junction holder is disclosed in U.S. patent No. 4,092,036, issued to Sato et al. on May 30, 1978. This pipe junction holder comprises a substantially annular body 10 having a plurality of integral spaced clamping blocks, each such clamping block comprising a lateral top wall which extends sloped downwardly away from the body 10. A through-hole is provided in the lateral top for inserting therethrough a bolt 30, which causes a pressing member attached thereto to bite into the pipe.
Several types of clamping means have been proposed for use with the above-described pipe junction holder. For example, Sato describes two types sTA-oz carr ~ 78169 of bolts which may be used with the above-described pipe junction holder.
In many applications it is desirable to install the pipe processing member at a predetermined torque. The Sato bolts are torqued to the desired value by external devices such as torque wrenches. Operator error or use of incorrect tools can result in installing such bolts at torques lower or greater than the desired torque.
More recently, a torque-limiting nut and bolt assembly has been proposed in U.S. Patent No. 4,627,774, issued to Bradley et al. on December 9, 1986 for use with the Sato pipe junction holder. The Bradley bolt includes a bolt shank having a threaded first end portion and a non-threaded second end portion, a secondary drive head on the second shank portion and a primary shearable drive head on the secondary drive bread.
A hollow nut is secured over both drive heads and a portion of the non-threaded shank section. The hollow nut drives the primary drive head which rotates relative to the secondary drive head until the primary drive head shears off at a predetermined torque releasing the nut and primary drive head. The secondary drive head remains on the shank for adjustment and removal of the bolt.
The present invention provides a novel torque-limiting nut and bolt which may be utilized with the above-described pipe junction holder. The nut and bolt of the present invention are relatively less expensive to manufacture and easier to install compared to the known prior art devices adapted for use with the above-noted pipe junction holder.
SUMMARY OF THE INVENTION
s The present invention provides a pipe junction holder, comprising a substantially annular body having an integral clamping block containing a through opening; a bolt having: (i) a lower threaded; (ii) a lower flange on the lower end; (iii) a shank having a neck for receiving a spanner thereon on the lower flange, said flange passing through the opening in the clamping block;
(iv) to a weak point on the shank; (v) an upper flange on the weak point; and (vi) an upper threaded end having threads in the direction opposite the direction of the threads on the lower end; a pipe pressing member having an internal threaded hole mounted on the lower threaded end of the bolt; and a nut having an internal threaded option and a set therein mounted on the upper threaded end in a 15 manner that enables the seat to be placed on the upper flange.
Examples of the more important features of the invention thus have been summarized rather broadly in order that detailed description thereof that follows may be better understood and in order that the contributions to the art may be 2 o appreciated. 'there are, of course, additional features of the invention that will be described hereinafter andl which will form the subject of the claims appended hereto.
~1187~9 BRIEF DESCRIPTION OF THE DRAWINGS
For detailed understanding of the present invention, references should be made to the following detailed description of the preferred embodiment taken in conjunction with the accompanying drawings, in which like elements have been given like numerals and wherein:
FIG.1 shows a partial sectional elevation view of a pipe junction holder positioned in relation to a pair of joined pipes.
FIG. 2 shows a torque-limiting bolt and nut according to the present invention for use with the pipe junction holer of FIG.1.
FIG. 2a shows a sectional elevation view of the nut shown in FIG. 2.
FIG. 3 shows the nut and bolt of FIG. 2 aligned with a pipe pressing member.
FIG. 4 shows the placement of the nut and bolt shown in FIG. 2 in the pipe junction holder positioned in relation to the pair of joined pipes shown in FIG. 1.
FIG. 5 shows the nut and bolt assembly of the present invention fully engaged with the pipe after the nut has been turned beyond a pre-determined torque limit.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG.1 shows a partial sectional view of a commonly used pipe junction holder 10 positioned for attachment with a pair of joined pipes 20 and 30, such as pipes joined to carry a fluid therethrough. Typically, to join two pipes together, the coupling end 22 of the first pipe 20 having an inside diameter at an internal surface 28 greater than the outside diameter at the surface 32 of the second pipe 30 is placed over the first pipe 30 as shown in FIG.1. The coupling 22 has an outside enlarged mouth 24, a vertical wall 26 having a plurality of spaced holes (not shown) for attaching thereto a pipe junction holder, such as the pipe junction holder 10. In other certain applications, the member 30 may be a pipe fitting coupled to the pipe 20.
The present invention, however, is equally applicable to such applications and other similar applications.
The pipe junction holder 10 has a substantially annular body 12 having an internal diameter defined at an internal surface 16 that in slightly greater than the outside diameter at the surface 32 of the pipe 30. The pipe junction holder 10 contains an annular projection 14 along its internal surface 16 that seats on the pipe 30 and abuts against the pipe mouth 24.
An annular insert 18 may be placed substantially conforming to the inside dimensions of the mouth 24 imay be placed therein. A plurality of spaced holes (not shown) are provided along the annular body 12. Such holes are aligned with the holes in the coupling flange 26 for coupling the flange 26 and the pipe junction holder 10 by a desired means, such as bolts (not shown).
The pipe junction holder 10 contains a plurality of integral clamping blocks 13 around the periphE:ry of the annular body 12 extending away from the annular projection 14. The clamping block 13 has a wall having slant surfaces l0 13a and 13b relative to the longitudinal surface of the pipe 30. A through hole in the block 13 is provided inserting therethrough a means for clamping the pipe junction holder 10 to the pipe 30. A substantially vertical wall 17 may be provided at the front of the wall to retain the claiming member to the clamping block 13.
As noted earlier, the present invention provides a novel nut and bolt clamping means for use with a pipe junction holder, such as shown in FIG. 1.
The clamping means of the present invention, however, may be utilized in any other suitable application. FIGS. 2 and 3 show the nut and bolt clamping means 2 o according to the present invention and FIGS. 4 and 5 show the use of the nut and bolt with the pipe junction holder 10 placed in relation to common types of joined pipes 20 and 30.
Turning now to FIGS. 2 and 3, the bolt 40 has an annular flange or shoulder 44 having a diameter that is greater than the smaller side of the hole 15, a lower threaded portion 42 and a substantially cylindrical shank 46, having dimensions that will enable the shank 46 to freely rotate in the hole 15. The s upper portion of the shank 46 has a neck 48 which preferably may be turned by utilizing readily available tool, such as a spanner. Any other suitable provision may be made in place of the neck 48 that will enable the bolt 40 to be turned by a desired means. The bolt has a weak point 50 between the neck 48 and a second flange 52, which preferably is smaller in diameter then the lower flange l0 44. The bolt 40 terminates at an upper threaded end 54 above the upper flange 52. The threads 56 made in the direction A-A on the upper end 54 are in opposite direction B-B to the threads 43 in the lower section 42.
A torque nut 60 having an upper threaded portion 62 and a lower hollow 15 unthreaded portion 64 is threadably placed (screwed) on to the upper threaded end 54. The lower hollow portion 64 has an internal diameter less than the diameter of the flange 52 so that when the nut 60 is fully engaged with the threads 56, the seat 65 rests, against the upper surface 53 of the flange 52.
Any further tightening of the nut 60 will cause the bolt to rotate. If the threads 56 on 2 o the upper portion 54 accepts the nut 60 in a clockwise rotation, then the entire bolt will rotate in the clockwise direction after the nut 60 has been fully engaged with the seat 53. A pipe pressing member s 70, such as a wedge, is designed to engage with threads 43 of the lower portion 42. When the pressing member 70 is fully engaged with the bolt 40, the lower end 45 of the flange 44 may be rest against the upper surface 71 of the pressing member 70. Teeth 76 and 78 are provided at the bottom side of the pressing s member 70 for biting into the pipe 30.
FIGS. 4 and 5 show use of the nut 60 and bolt 40 shown in FIGS. 2 and 3 with the pipe junction holder 10 shown in FIG. 1. To engage the bolt 40 and nut 60 with the pipe junction holder 10, the bolt 40 is inserted in the hole 15 of the to clamping block 12 so that thE~ shank 46 lies in the hole 15. The pressing member 70 is fully engaged with the lower threaded end 42 and the nut 60 is fully engaged with the upper threaded end 54. In this position, the seat 65 of the nut 60 rests on the uppeir flange surface 53 and the upper surface 45a of the bottom flange 44 is placed near or against the lower surface 13b of the 15 clamping block 12.
The nut 60 is then rotated in the direction A-A which causes the pressing member 70 to disengage from the lower end 42, thereby causing the pressing member 70 to move downward toward the pipe and eventually bite into the pipe 20 30 at points 76a and 78b (see FIG.S). When the torque on the nut 60 reaches a predetermined limit, the bolt breaks at the weak point 50. The bolt 40 may be removed by using an appropriate wrench in the neck 48 of the bolt 40. Any desired predetermined torque limit for the ~~7g:7b~
bolt 40 may be set by appropriately designing the weak point by known methods in the art. A torque limit of ninety (90) pounds is frequently used for clamping a pipe junction member of two joined pipes. The threaded break-off nut eliminates the need to replace the entire wedge assembly if the head breaks off prematurely. The pipe junction holders described herein are usually transported without protective packaging, which can cause some of the prior art bolts to break off. The design of the nut of the present invention ensures that the entire assembly remains together during transportation. Further, the vibration during transportation does not loosen the assembly.
Thus, the present invention provides a nut and bolt assembly having a lower threaded end and opposing upper threaded end. A first flange seats above the lower threaded end and an upper flange seats below the upper threaded end. A weak point having a known torque limit is provided below the upper flange. A nut is mounted on the upper threaded end. When the nut is turned beyond the torque limit of the weak point, it causes the bolt to break at the weak point.
The bolt of the present invention is relatively inexpensive to make and use. It preferably is designed for used with a wedge and a pipe junction holder for holding a pair of joined pipes. No special tools are required to install or replace the mechanical joint restraint device. The wedges Z ~ 7~~' b 9 preferably are designed to fit specific pipe sizes. Each wedge preferably is contoured to fit the outside diameter of its associated pipe. The wedges preferably are heat treated and the system of the present invention preferably is designed for use with various types of ductile iron pipes and pipe fittings. The system also is designed for high pressure applications, such as internal pipe pressures of up to 350 psi.
The foregoing description is directed to particular embodiments of the present invention for the purpose of illustration and explanation. It will be apparent, however, to one skilled in the art that many modifications and changes to the embodiment set forth above are possible without departing from the scope and the spirit of the invention. It is intended that the following claims be interpreted to embrace all such modifications and changes.
Several types of clamping means have been proposed for use with the above-described pipe junction holder. For example, Sato describes two types sTA-oz carr ~ 78169 of bolts which may be used with the above-described pipe junction holder.
In many applications it is desirable to install the pipe processing member at a predetermined torque. The Sato bolts are torqued to the desired value by external devices such as torque wrenches. Operator error or use of incorrect tools can result in installing such bolts at torques lower or greater than the desired torque.
More recently, a torque-limiting nut and bolt assembly has been proposed in U.S. Patent No. 4,627,774, issued to Bradley et al. on December 9, 1986 for use with the Sato pipe junction holder. The Bradley bolt includes a bolt shank having a threaded first end portion and a non-threaded second end portion, a secondary drive head on the second shank portion and a primary shearable drive head on the secondary drive bread.
A hollow nut is secured over both drive heads and a portion of the non-threaded shank section. The hollow nut drives the primary drive head which rotates relative to the secondary drive head until the primary drive head shears off at a predetermined torque releasing the nut and primary drive head. The secondary drive head remains on the shank for adjustment and removal of the bolt.
The present invention provides a novel torque-limiting nut and bolt which may be utilized with the above-described pipe junction holder. The nut and bolt of the present invention are relatively less expensive to manufacture and easier to install compared to the known prior art devices adapted for use with the above-noted pipe junction holder.
SUMMARY OF THE INVENTION
s The present invention provides a pipe junction holder, comprising a substantially annular body having an integral clamping block containing a through opening; a bolt having: (i) a lower threaded; (ii) a lower flange on the lower end; (iii) a shank having a neck for receiving a spanner thereon on the lower flange, said flange passing through the opening in the clamping block;
(iv) to a weak point on the shank; (v) an upper flange on the weak point; and (vi) an upper threaded end having threads in the direction opposite the direction of the threads on the lower end; a pipe pressing member having an internal threaded hole mounted on the lower threaded end of the bolt; and a nut having an internal threaded option and a set therein mounted on the upper threaded end in a 15 manner that enables the seat to be placed on the upper flange.
Examples of the more important features of the invention thus have been summarized rather broadly in order that detailed description thereof that follows may be better understood and in order that the contributions to the art may be 2 o appreciated. 'there are, of course, additional features of the invention that will be described hereinafter andl which will form the subject of the claims appended hereto.
~1187~9 BRIEF DESCRIPTION OF THE DRAWINGS
For detailed understanding of the present invention, references should be made to the following detailed description of the preferred embodiment taken in conjunction with the accompanying drawings, in which like elements have been given like numerals and wherein:
FIG.1 shows a partial sectional elevation view of a pipe junction holder positioned in relation to a pair of joined pipes.
FIG. 2 shows a torque-limiting bolt and nut according to the present invention for use with the pipe junction holer of FIG.1.
FIG. 2a shows a sectional elevation view of the nut shown in FIG. 2.
FIG. 3 shows the nut and bolt of FIG. 2 aligned with a pipe pressing member.
FIG. 4 shows the placement of the nut and bolt shown in FIG. 2 in the pipe junction holder positioned in relation to the pair of joined pipes shown in FIG. 1.
FIG. 5 shows the nut and bolt assembly of the present invention fully engaged with the pipe after the nut has been turned beyond a pre-determined torque limit.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG.1 shows a partial sectional view of a commonly used pipe junction holder 10 positioned for attachment with a pair of joined pipes 20 and 30, such as pipes joined to carry a fluid therethrough. Typically, to join two pipes together, the coupling end 22 of the first pipe 20 having an inside diameter at an internal surface 28 greater than the outside diameter at the surface 32 of the second pipe 30 is placed over the first pipe 30 as shown in FIG.1. The coupling 22 has an outside enlarged mouth 24, a vertical wall 26 having a plurality of spaced holes (not shown) for attaching thereto a pipe junction holder, such as the pipe junction holder 10. In other certain applications, the member 30 may be a pipe fitting coupled to the pipe 20.
The present invention, however, is equally applicable to such applications and other similar applications.
The pipe junction holder 10 has a substantially annular body 12 having an internal diameter defined at an internal surface 16 that in slightly greater than the outside diameter at the surface 32 of the pipe 30. The pipe junction holder 10 contains an annular projection 14 along its internal surface 16 that seats on the pipe 30 and abuts against the pipe mouth 24.
An annular insert 18 may be placed substantially conforming to the inside dimensions of the mouth 24 imay be placed therein. A plurality of spaced holes (not shown) are provided along the annular body 12. Such holes are aligned with the holes in the coupling flange 26 for coupling the flange 26 and the pipe junction holder 10 by a desired means, such as bolts (not shown).
The pipe junction holder 10 contains a plurality of integral clamping blocks 13 around the periphE:ry of the annular body 12 extending away from the annular projection 14. The clamping block 13 has a wall having slant surfaces l0 13a and 13b relative to the longitudinal surface of the pipe 30. A through hole in the block 13 is provided inserting therethrough a means for clamping the pipe junction holder 10 to the pipe 30. A substantially vertical wall 17 may be provided at the front of the wall to retain the claiming member to the clamping block 13.
As noted earlier, the present invention provides a novel nut and bolt clamping means for use with a pipe junction holder, such as shown in FIG. 1.
The clamping means of the present invention, however, may be utilized in any other suitable application. FIGS. 2 and 3 show the nut and bolt clamping means 2 o according to the present invention and FIGS. 4 and 5 show the use of the nut and bolt with the pipe junction holder 10 placed in relation to common types of joined pipes 20 and 30.
Turning now to FIGS. 2 and 3, the bolt 40 has an annular flange or shoulder 44 having a diameter that is greater than the smaller side of the hole 15, a lower threaded portion 42 and a substantially cylindrical shank 46, having dimensions that will enable the shank 46 to freely rotate in the hole 15. The s upper portion of the shank 46 has a neck 48 which preferably may be turned by utilizing readily available tool, such as a spanner. Any other suitable provision may be made in place of the neck 48 that will enable the bolt 40 to be turned by a desired means. The bolt has a weak point 50 between the neck 48 and a second flange 52, which preferably is smaller in diameter then the lower flange l0 44. The bolt 40 terminates at an upper threaded end 54 above the upper flange 52. The threads 56 made in the direction A-A on the upper end 54 are in opposite direction B-B to the threads 43 in the lower section 42.
A torque nut 60 having an upper threaded portion 62 and a lower hollow 15 unthreaded portion 64 is threadably placed (screwed) on to the upper threaded end 54. The lower hollow portion 64 has an internal diameter less than the diameter of the flange 52 so that when the nut 60 is fully engaged with the threads 56, the seat 65 rests, against the upper surface 53 of the flange 52.
Any further tightening of the nut 60 will cause the bolt to rotate. If the threads 56 on 2 o the upper portion 54 accepts the nut 60 in a clockwise rotation, then the entire bolt will rotate in the clockwise direction after the nut 60 has been fully engaged with the seat 53. A pipe pressing member s 70, such as a wedge, is designed to engage with threads 43 of the lower portion 42. When the pressing member 70 is fully engaged with the bolt 40, the lower end 45 of the flange 44 may be rest against the upper surface 71 of the pressing member 70. Teeth 76 and 78 are provided at the bottom side of the pressing s member 70 for biting into the pipe 30.
FIGS. 4 and 5 show use of the nut 60 and bolt 40 shown in FIGS. 2 and 3 with the pipe junction holder 10 shown in FIG. 1. To engage the bolt 40 and nut 60 with the pipe junction holder 10, the bolt 40 is inserted in the hole 15 of the to clamping block 12 so that thE~ shank 46 lies in the hole 15. The pressing member 70 is fully engaged with the lower threaded end 42 and the nut 60 is fully engaged with the upper threaded end 54. In this position, the seat 65 of the nut 60 rests on the uppeir flange surface 53 and the upper surface 45a of the bottom flange 44 is placed near or against the lower surface 13b of the 15 clamping block 12.
The nut 60 is then rotated in the direction A-A which causes the pressing member 70 to disengage from the lower end 42, thereby causing the pressing member 70 to move downward toward the pipe and eventually bite into the pipe 20 30 at points 76a and 78b (see FIG.S). When the torque on the nut 60 reaches a predetermined limit, the bolt breaks at the weak point 50. The bolt 40 may be removed by using an appropriate wrench in the neck 48 of the bolt 40. Any desired predetermined torque limit for the ~~7g:7b~
bolt 40 may be set by appropriately designing the weak point by known methods in the art. A torque limit of ninety (90) pounds is frequently used for clamping a pipe junction member of two joined pipes. The threaded break-off nut eliminates the need to replace the entire wedge assembly if the head breaks off prematurely. The pipe junction holders described herein are usually transported without protective packaging, which can cause some of the prior art bolts to break off. The design of the nut of the present invention ensures that the entire assembly remains together during transportation. Further, the vibration during transportation does not loosen the assembly.
Thus, the present invention provides a nut and bolt assembly having a lower threaded end and opposing upper threaded end. A first flange seats above the lower threaded end and an upper flange seats below the upper threaded end. A weak point having a known torque limit is provided below the upper flange. A nut is mounted on the upper threaded end. When the nut is turned beyond the torque limit of the weak point, it causes the bolt to break at the weak point.
The bolt of the present invention is relatively inexpensive to make and use. It preferably is designed for used with a wedge and a pipe junction holder for holding a pair of joined pipes. No special tools are required to install or replace the mechanical joint restraint device. The wedges Z ~ 7~~' b 9 preferably are designed to fit specific pipe sizes. Each wedge preferably is contoured to fit the outside diameter of its associated pipe. The wedges preferably are heat treated and the system of the present invention preferably is designed for use with various types of ductile iron pipes and pipe fittings. The system also is designed for high pressure applications, such as internal pipe pressures of up to 350 psi.
The foregoing description is directed to particular embodiments of the present invention for the purpose of illustration and explanation. It will be apparent, however, to one skilled in the art that many modifications and changes to the embodiment set forth above are possible without departing from the scope and the spirit of the invention. It is intended that the following claims be interpreted to embrace all such modifications and changes.
Claims (5)
1. A torque-limiting bolt for use in cooperation with an apparatus having a threaded aperture, comprising:
a. a lower threaded potion for engagement with the threaded aperture of the apparatus, said lower threaded portion having a top end and a bottom end;
b. a lower flange on said top end of said lower threaded portion;
c. a shank above said lower flange having a neck near said top for receiving a turning tool thereon and a weak point above said neck;
d. an upper flange above said weak point on said shank; and e. an upper threaded portion above said upper flange having threads in the direction opposite to the direction of the threads on said lower threaded portion, whereby the rotation of the bolt in the direction of the threads on said upper threaded portion causes the apparatus to disengage from said tower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point.
a. a lower threaded potion for engagement with the threaded aperture of the apparatus, said lower threaded portion having a top end and a bottom end;
b. a lower flange on said top end of said lower threaded portion;
c. a shank above said lower flange having a neck near said top for receiving a turning tool thereon and a weak point above said neck;
d. an upper flange above said weak point on said shank; and e. an upper threaded portion above said upper flange having threads in the direction opposite to the direction of the threads on said lower threaded portion, whereby the rotation of the bolt in the direction of the threads on said upper threaded portion causes the apparatus to disengage from said tower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point.
2. A torque-limiting bolt for use in cooperation with a first apparatus having a threaded aperture and a second apparatus having a non-threaded aperture, comprising:
a. a lower threaded portion having a top and a bottom;
b. an upper threaded portion having a top and a bottom;
c. a lower flange at said top of said lower threaded portion;
d. an upper flange at the bottom of said upper threaded portion;
e. a shank connecting said upper flange and said lower flange, said shank having a provision between said lower flange and said upper flange for turning said shank and a weak point between said turning provision and said upper flange; and f. said threads on said lower threaded portion and said upper threaded portion being in opposing direction such that rotation of the bolt in the direction of said threads on said upper threaded portion causes the apparatus to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point and said lower flange having circumference greater than the non-threaded aperture of the second apparatus and said upper flange having a circumference smaller than the non-threaded aperture of the second apparatus such that the second apparatus can be positioned over said upper flange to abut against said lower flange.
a. a lower threaded portion having a top and a bottom;
b. an upper threaded portion having a top and a bottom;
c. a lower flange at said top of said lower threaded portion;
d. an upper flange at the bottom of said upper threaded portion;
e. a shank connecting said upper flange and said lower flange, said shank having a provision between said lower flange and said upper flange for turning said shank and a weak point between said turning provision and said upper flange; and f. said threads on said lower threaded portion and said upper threaded portion being in opposing direction such that rotation of the bolt in the direction of said threads on said upper threaded portion causes the apparatus to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point and said lower flange having circumference greater than the non-threaded aperture of the second apparatus and said upper flange having a circumference smaller than the non-threaded aperture of the second apparatus such that the second apparatus can be positioned over said upper flange to abut against said lower flange.
3. A torque-limiting bolt for use in cooperation with an apparatus having a threaded aperture, comprising:
a. a first threaded shank at an upper end and a second threaded shank at a lower end for engagement with the threaded aperture of the apparatus;
b. a third shank between said first threaded shank and said second threaded shank, said third shank having a provision for rotating the bolt;
c. a first flange between said first threaded shank and said third shank and a second flange between said second threaded shank and said third shank;
d. a weak point between said first flange and said third shank; and e. said first threaded shank and said second threaded shank being threaded in opposing directions whereby the rotation of the bolt in the direction of said first threaded shank causes the apparatus to disengage from said second threaded shank thereby moving away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point.
a. a first threaded shank at an upper end and a second threaded shank at a lower end for engagement with the threaded aperture of the apparatus;
b. a third shank between said first threaded shank and said second threaded shank, said third shank having a provision for rotating the bolt;
c. a first flange between said first threaded shank and said third shank and a second flange between said second threaded shank and said third shank;
d. a weak point between said first flange and said third shank; and e. said first threaded shank and said second threaded shank being threaded in opposing directions whereby the rotation of the bolt in the direction of said first threaded shank causes the apparatus to disengage from said second threaded shank thereby moving away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point.
4. A torque-limiting nut and bolt assembly for use in cooperation with a first apparatus having a threaded aperture and a second apparatus having a non-threaded aperture, comprising:
a. a lower threaded portion having a top and a bottom;
b. an upper threaded portion having a top and bottom;
c. a lower flange on said top of said lower threaded portion;
d. an upper flange on said bottom of said upper threaded portion;
e. a shank between said upper flange and said lower flange, said shank having a provision between said lower flange and said upper flange for turning said shank;
f. a weak point between said turning provision and said upper flange;
g. said threads on said lower threaded portion and said upper threaded portion being in opposing directions, whereby the rotation of the bolt in the direction of said threads on said upper threaded portion causes the first apparatus to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point, said lower flange having a circumference greater than said upper flange such that the second apparatus can be positioned over said upper flange to rest against said lower flange; and h. a nut having a 'threaded portion and a seat therein, said nut placed on said upper threaded portion with said seat abutting said upper flange.
a. a lower threaded portion having a top and a bottom;
b. an upper threaded portion having a top and bottom;
c. a lower flange on said top of said lower threaded portion;
d. an upper flange on said bottom of said upper threaded portion;
e. a shank between said upper flange and said lower flange, said shank having a provision between said lower flange and said upper flange for turning said shank;
f. a weak point between said turning provision and said upper flange;
g. said threads on said lower threaded portion and said upper threaded portion being in opposing directions, whereby the rotation of the bolt in the direction of said threads on said upper threaded portion causes the first apparatus to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point, said lower flange having a circumference greater than said upper flange such that the second apparatus can be positioned over said upper flange to rest against said lower flange; and h. a nut having a 'threaded portion and a seat therein, said nut placed on said upper threaded portion with said seat abutting said upper flange.
5. A pipe junction holder for use in cooperation with an apparatus having a threaded aperture, comprising:
a. an integral clamping block containing a through opening;
b. a bolt having:
i. a lower threaded portion with a top and a bottom end;
ii. a lower flange on said top end of said lower threaded portion;
iii. a shank above said lower flange having a neck for receiving a turning tool thereon, said flange passing through the opening in the clamping block and a weak point on said shank above said neck;
iv. an upper flange above said weak point; and v. an upper threaded portion above said upper flange having a top end and a bottom end and having threads in the directions opposite the direction of the threads on said lower portion;
c. a pipe pressing member having an internal threaded hole for engaging said lower threaded portion of the bolt, whereby the rotation of the bolt in the direction of the threads on said upper portion causes said pipe pressing member to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point; and d. a nut having an internal threaded portion and a seat therein mounted on said upper threaded portion in a manner that enables said seat to be placed on said upper flange.
a. an integral clamping block containing a through opening;
b. a bolt having:
i. a lower threaded portion with a top and a bottom end;
ii. a lower flange on said top end of said lower threaded portion;
iii. a shank above said lower flange having a neck for receiving a turning tool thereon, said flange passing through the opening in the clamping block and a weak point on said shank above said neck;
iv. an upper flange above said weak point; and v. an upper threaded portion above said upper flange having a top end and a bottom end and having threads in the directions opposite the direction of the threads on said lower portion;
c. a pipe pressing member having an internal threaded hole for engaging said lower threaded portion of the bolt, whereby the rotation of the bolt in the direction of the threads on said upper portion causes said pipe pressing member to disengage from said lower threaded portion of the bolt and to move away from the bolt to a maximum threshold distance whereby further rotation of the bolt in the same direction causes the bolt to break at said weak point; and d. a nut having an internal threaded portion and a seat therein mounted on said upper threaded portion in a manner that enables said seat to be placed on said upper flange.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/491,270 | 1995-06-16 | ||
| US08/491,270 US5772252A (en) | 1995-06-16 | 1995-06-16 | Pipe junction holder with a novel torque-limiting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2178769A1 CA2178769A1 (en) | 1996-12-17 |
| CA2178769C true CA2178769C (en) | 2002-04-23 |
Family
ID=23951483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002178769A Expired - Lifetime CA2178769C (en) | 1995-06-16 | 1996-06-11 | Pipe junction holder with a novel torque-limiting device |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5772252A (en) |
| CA (1) | CA2178769C (en) |
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| JP3668547B2 (en) * | 1996-01-29 | 2005-07-06 | ヤマハ株式会社 | Karaoke equipment |
| US6612631B1 (en) * | 1997-08-19 | 2003-09-02 | Actek | Trench plate connector |
| US6578889B2 (en) * | 1997-08-19 | 2003-06-17 | Fred R. Pearl | Forged trench plate connector |
| US6161883A (en) * | 1998-07-01 | 2000-12-19 | Actek Enterprise, Inc. | Hoist ring with integral load ring and large diameter skirt |
| US6161884A (en) * | 1998-07-01 | 2000-12-19 | Actek Enterprises, Inc. | Source-coded unitary eye bolts |
| US6322273B1 (en) | 1999-10-08 | 2001-11-27 | The Ford Meter Box Company, Inc. | Joint restraint assembly |
| DE20001350U1 (en) * | 2000-01-27 | 2000-04-20 | Kukatsch Eckhard | Connector for tubular elements, especially handrails |
| CA2372418C (en) * | 2001-02-20 | 2011-09-20 | Katsutoshi Tenma | Supporting device for non-averaged force |
| US6641326B2 (en) * | 2001-12-21 | 2003-11-04 | General Electric Company | Removable stud for joining casing flanges |
| JP2003252218A (en) * | 2002-02-27 | 2003-09-10 | Toyoda Mach Works Ltd | Mounting structure of reservoir |
| US20030230897A1 (en) * | 2002-06-12 | 2003-12-18 | Ebaa Iron, Inc. | Restrained sleeve pipe coupling |
| US6739631B2 (en) | 2002-09-11 | 2004-05-25 | Radford S. Smith | Torque-limiting bolt-and-nut assembly |
| US20040062596A1 (en) * | 2002-09-27 | 2004-04-01 | Star Pipe Products, Inc. | Apparatus and method for joining tubulars |
| US7185924B1 (en) * | 2003-08-08 | 2007-03-06 | Sigma Corporation | Joint restraint assembly |
| US7484775B2 (en) * | 2004-07-13 | 2009-02-03 | Harold Kennedy, Jr. | Pipe joint restraint |
| JP5266956B2 (en) * | 2007-09-11 | 2013-08-21 | ダイキン工業株式会社 | Dual-use pipe joint, dedicated tool for this dual-use pipe joint, refrigeration equipment, separation type air conditioner |
| JP2009236153A (en) * | 2008-03-26 | 2009-10-15 | Honda Motor Co Ltd | Coupling structure for absorption refrigeration cycle |
| US9289220B2 (en) * | 2008-06-24 | 2016-03-22 | Extremity Medical Llc | Intramedullary fixation assembly and method of use |
| DE102012103672A1 (en) * | 2012-04-26 | 2013-10-31 | Arcus Elektrotechnik Alois Schiffmann Gmbh | shear bolt |
| US9366282B2 (en) | 2013-09-06 | 2016-06-14 | Thomas & Betts International Llc | Torque controlling break screw |
| JP5869051B2 (en) * | 2014-06-09 | 2016-02-24 | 三菱日立パワーシステムズ株式会社 | Rotating machine, rotating machine assembly method, rotating machine maintenance method |
| WO2016133748A1 (en) * | 2015-02-16 | 2016-08-25 | Schlumberger Technology Corporation | Bottom hole assembly connections |
| US9822910B2 (en) | 2015-05-19 | 2017-11-21 | Star Pipe Products, Ltd. | Joint restraint assembly |
| US10036497B2 (en) | 2015-10-28 | 2018-07-31 | Sigma Corporation | Joint restraint devices and methods of using same |
| US9739401B1 (en) | 2016-05-09 | 2017-08-22 | Harold Kennedy & Associates, Inc. | Pipe gripping elements and pipe joint restraints incorporating same |
| US10465732B2 (en) * | 2017-03-08 | 2019-11-05 | Connector Products Inc. | Captive shear bolt |
| DE102018217375A1 (en) * | 2018-10-11 | 2020-04-16 | Robert Bosch Gmbh | Centering screw for aligning two elements to each other, centering arrangement |
| MX2022009013A (en) | 2020-01-22 | 2022-10-10 | Burndy Llc | Wedge cable connector. |
| MX2022010036A (en) | 2020-02-17 | 2022-10-03 | Burndy Llc | Connector with captive interface. |
| US11511971B2 (en) * | 2021-03-30 | 2022-11-29 | Caterpillar Inc. | Adjustable length lifting bracket |
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| US3191486A (en) * | 1962-10-29 | 1965-06-29 | Martin Marietta Corp | Automatic torque indicating and applying devices |
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- 1995-06-16 US US08/491,270 patent/US5772252A/en not_active Expired - Lifetime
-
1996
- 1996-06-11 CA CA002178769A patent/CA2178769C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2178769A1 (en) | 1996-12-17 |
| US5772252A (en) | 1998-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20160613 |