CA1276818C - Adjustable motor-operated screw driving device - Google Patents

Adjustable motor-operated screw driving device

Info

Publication number
CA1276818C
CA1276818C CA000489632A CA489632A CA1276818C CA 1276818 C CA1276818 C CA 1276818C CA 000489632 A CA000489632 A CA 000489632A CA 489632 A CA489632 A CA 489632A CA 1276818 C CA1276818 C CA 1276818C
Authority
CA
Canada
Prior art keywords
sleeve
stop
housing
stop sleeve
actuating
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 - Fee Related
Application number
CA000489632A
Other languages
French (fr)
Inventor
Paul Durr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Application granted granted Critical
Publication of CA1276818C publication Critical patent/CA1276818C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141Mechanical overload release couplings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0064Means for adjusting screwing depth

Abstract

ABSTRACT OF THE DISCLOSURE

In a motor-driven screw driving device, a drive unit and a drive member are located within a housing and are interconnected by a torque-limiting coupling. The coupling is adjustable by changing the force applied to a spring element. The spring element is supported within a stop sleeve located within the housing and the stop sleeve is axially displaceable relative to the housing.
A depth stop on the drive spindle is adjustable relative to the stop sleeve. An actuating sleeve accessible on the exterior of the screw driving device affords the adjust-ment of the stop sleeve and the depth stop. A connecting element is secured to the actuating sleeve and is in engagement with the depth stop so that the actuating sleeve and depth stop can be rotated as a unit. The connecting element is selectively engageable with the stop sleeve so that the actuating sleeve and stop sleeve can be rotated as a unit for adjusting the torque-limiting coupling.

Description

:~'76~

The invention is directed to a motor-operated screw driving device. In the device according to the invention an adjustable torque-limiting coupling is positioned between a drive uni-t and a drive spindle for effecting the screw drivin~ opera~ion. A stop sleeve is mounted within, and is axially displaceabl~ adjustable relative to the housing of the device. An adjustable spring element is positioned wi-thin the stop sleeve for adjusting the torque-limiting coupling. Further, a depth stop is mounted on the stop sleeve and can be axially displaced along the sleeve. An actuating sleeve is connected to the depth s-top so that the actuatin~ sleeve and depth stop can be rotated as a unit for the axial displacement o the depth stop.
In known motor-operated scre~ driving devices an adjustable torque-limiting coupling is used as well as an adjustable depth stop~ The torque-limiting coupling is adjusted by varying a tension force applied by a spriny element located between a coupling part arranged for rotation with a drive spindle, and a power take-off part of a drive unit.
Accordinyly, a stop sleeve or bush acting as an abutment ~or the spring element is axially displaceable relative to the device housing. A first actuating sleeve connected with the stop sleeve affords -the ad~usting procedure. Separate from the first actuating sleeve is a second actuating sleeve Eor adjusting the depth stop. By means of the second actuaking sleeve, manually transmitted rotational movement is transmitted to the depth stop and it is axially displaced relative to the stop sleeve due to a threaded connection ~ith the device on which the ~epth stop is positioned.
In this known arran-~ement there is the particular disadvantage that, with respect to the handling of the device, there is the possibility of con~using -the actua'cing sleeves.
Therefore, -the primary object of the present invention is to provide a simple actuating device capable of being operated in a problem-free manner where a screw driving device of the type described above affords adjustment o~ the torque-limiting coupling and the depth stoP.
In accordance with the present invention, an .
actuating sleeve for the desired adjustment includes a connecting element affording a rigid connection with the stop sleeve so that the actuating sleeve and the stop sleeve can be rotated as a unit.
As a result, the actuating sleeve affords a double function in that in one position it can adjust the depth stop and in another position it can adjust the torque limiting coupling. Accordingly, a simple cons.truction is a~orded which faciliates the handling and adjustment of the screw driving device.
The actuating sleeve includes a pin-like connection member engageable in catch recesses in the front portion oE the stop sleeve so that interengagement is provided between the actuating sleeve and the stop sleeve. The catch recess can ~e provided in the stop sleeve or in a supporting ring mounted on the stop sleeve.

.

1~76~

~ re~erably, catch elements are provided on the actuating ~leeve and on the stop sleeve for ~ixing the actuating sleeve in position relative to the stop sleeve where the two sleeves can be ro-tated as a unit. Fur~h~r, by displacement of the catch elements into a spaced apart position it is possible to rotate the actuating sleeve relative to the stop sleeve.
The ar.rangement of the catch elements permits the user oE the screw driving device ko observe the position of the actuating sleeve for effecting the desired adjustments. Moreover, the catch elements prevent any accidental change in the position of the actuatin~ sleeve which might occur during vibration of the device or because of other outside influences.
The various features o novelt~ which charac-terize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had ko the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
IN THE DR~WINGS
Figure 1 is a side e].evational view of a sc~e~
driving device e~hodying the present inVention;
Figure 2 is an enlarged partial axially extending sectional view through the front part o~ the screw dr.iving device, as shown in Figure 1, with the depth stop and the screw driving insert removed, and, 1;27~i8:~
Figure 3 is a partial sectional view of the section shown in Fi~ure 2 with the actuating sleeve displaced into another operating posi-tion.
The screw driving device depicted in Figure 1 has a housing 1 in the form of a hand operated tool. The device has a Eront end at the left and a rear end at the right and -the various parts of the device have a similar front end and rear end orientation. A handle 2 is shown extending downwardly from the rear end of the housing 1 and a cable 3 extends in-to the lower end of the handle and serves as a current supply line. The screw driving device is operated by a trigger 4 for placing the device in the on or off condition. At the front end of the housing 1, an actuating sleeve 5 is positioned with a depth stop 6 projecting forwardly from the actuating sleeve. At the front end of the depth stop 6 there is a screw driving insert 7 extending forwardly out of the depth stop. The screw driving insert is a conventional member, accordingly, it is not described in ~urther detail.
In the right-hand or rear portion of Figure 2 a drive shat 8 from a motor (not shown) is illustrated.
At its front end, the drive shaft 8 has a pinion 8a engageable with a toothed WheeL 9 supported in a rotating bearing 11 on a drive spindle 12. Splndle 12 is a~ially divided into a rear spindle section 22 and a front spindle section 3~. The drive spindle is freely rotatable. The toothed wheel 9 acts as a power take-off part from the drive motor.
On the rear side of the toothed wheel 9 there .
.

~Z~ 8 is a roller bearing 13 in contact with the wheel. At its front side, the toothed wheel 9 has teeth 9a extending around the rear section 22 of the spindle. Immediately forward of the toothed wheel 9 is a disc-shaped coupling part 15 axially displaceably mounted on the rear section 22 of the drive spindle 12 and secured against relative rotation with the drive spindle by a splined connection 14 with the drive spindle.
The coupling part 15 has teeth 15a for engagement with the teeth 9a on the wheel 9. Attention is directed to the applicantls published European Patent Application No. 0 174 276 directed to the specific arrange-ment of the teeth 9a and 15a.
The rneshed inter-engagement of the teeth 15a on the coupling part 15 is effected with the teeth 9a on the front side of the wheel 9 by the biasing force of a spring element 16 made up of "Belleville" springs. The spring element 16 is supported at its front end by another roller bearing 17 which, in turn, bears against a securing ring 18 fitted into the inside surEace of an axially extending stop sleeve 19. Stop sleeve 19 projects axially forwardly from the region of the coupling part 15 toward the front end of the screw driving device. In combination~ the wheel 9, the couplincJ part 15 and the spring elemen~ 16 form a torque-limiting couplincJ 2]
Securely fitted on the front part of the rear section 22 oE the drive spindle 12 ls a ball bearing 23 which is axially displaceable between the supporting ring 24 fitted in the rear section 22 and a shoulder 22a at the front side of the ball bearing. The ball bearing 23 .

8~

is located just forward of -the roller bearing 17. Ball bearing 23 serves as a rotational bearing for the rear section 22 of the drive spindle 12.
Toward its rear end and on its radially outer surface, the s-t~p sleeve l9 is connected wi-th the housing 1 by a thread 25 so that the stop sleeve can be axially displaced relative to the housing for varying the biasing force afforded by the spriny 16. Forwardly of the thread 25, a radial borehole l9a is located in the stop sleeve l9 and a catch ball 26 is positioned in the borehole and is biased radially outwardly by a spring 27 into engagement with axially extending grooves 28 formed in the radially inner surface of the housing l. The grooves 28 extend in the circumferential direction around the inner surface of the housing 1.
Due to the interengagement of the catch ball 26 in the grooves 28, rotation of the stop sleeve l9 relative to the housing can be effected only after the biasing action 27 acting on the catch ball 26 is overcome.
Just forwardly of the borehole l9a, a graduated ring 29 is pressed on and encircles the outside surface of the stop sleeve 19. A viewing window 31 is formed in the housing 1 outwardly from the cJraduated ring 29 so that the adjusted torque stage of the device can be visually determ.ined. The maximum and minimum adjustment of the torque is defi.ned by a p.in 32 extending radially outwardly from the stop sleeve l9. By oVercomincJ the locking action of the catch ball 26, and rotating the stop sleeve l9 relative to the housing l, an adjustment of the torque can be attained.

'~ ~
. .

~.~'76818 A rotational bearing.33 for the front section 34 o~ the drive spindle 12 is located in the front region of the stop sleeve 19. In addition, a sealing ring in contact with and encircling the surface of the front section 34 is located just ahead of the rotational bearing 33. A connection ring 37, which is part of the depth stop 6 (not shown in Figures 2 and 3) is in threaded engagement, hy way of a thread 36, with the front end of . the stop sleeve 19.
~ctuating sleeve 5 is loca-ted radially outwardly from the front region of the stop sleeve 19 and its inner surface at its front end rests on the radially outer sur-face of the connection ring 37. Actuating sleeve 5 is formed of a plastics material and includes an axially elongated connecting element 38 in the form of a cast pin secured to the actuating sleeve. As can be seen in Figures 2 and 3, the coImecting element 38 is mounted in -a radially inwardly extending ring-like pro~ection on the actuating sleeve. The connecting element projects forward].y and rearwardly of the ring-like projection. .
At its front end 39a, the connecting element 38 is secured within an axially extending borehole 37a in the connection ring 37. ~he opposite rear end 3~b o~ the connecting element, as shown .in Figure ~, e~tends into a catch recess 19b in the stop sleeve 19. A plurality o~
the catch recesses l9b are arranged around the outer surface of the stop sleeve 19 with the recesses facing ~ .
toward the ~orward end of the stop sleeve.
In the engaged position of the actuating sleeve 5 with the stop sleeve 19, the actuating sleeve is : - 7 -~, .
- : . . .. : -1.2t~
held in a ~roove l9c encircling the outer surface of the stop sleeve 19 ~ust ahead of -the graduated ring 29. An annular bead 5a is formed at the rear end of the actuating sleeve and the bead resiliently seats within the groove l9c in the engaged posi-tion of the actuating sleeve with the stop sleeve. The bead 5a is formed on the ends of resilient Eingers formed in the actuating sleeve 5 so that the displacement of the bead 5a out of the groove l9c can be easily effected.
To operate the screw driving device, the screw driving insert 7 (not shown in Figures 2 and 3) is inserted into a receiving bore 39 in the enlarged front end of the front section 34 of the drive spindle.
Accordingly, the insert will rotate with the spindle. In the screw driving operation, which can be effected for driving or removing a screw, the ~ront section 34 of the drive spindle 12 is displaced toward the rear section 22 so that interengagement of the claw tooth collars or rings 34a and 22b is effected, whereby the drive spindle forms a unit arranged to be driven via the torque limiting coupling 21.
Torque is introduced from the drive shaft 8 through the torque limiting coupling 21 to the drive spindle 12 and then to the screw driving insext 7. The korque transmitted through the torque limiting coupling 21 is adjusted by varying the axial position of the stop sleeve 19 rela-tive to the housing. By this axial displacement the biasing force effected by the spring 16 on the coupling part 15 can be adjusted. The adjust-ment of the stop sleeve 19 is carried out by rotating the ~7~
actuatin~ sleeve 5. Due to the engagemen~ of the connecting element.38 in one o~ th.e catch recesses l9b, manual rotation of the actuating sleeve S rotates the stop sleeve 19 which is secured to the actuating sleeve so tha-t it rota~es with it. The axial displacement o the stop sleeve 19 is effected over the thread connection 25 with the housing 1.
To adjust the depth stop 6, it is necessary to displace the connecting ring 39 in the axial direction.
To perform such axial displacement, the actuating sleeve 5 is pulled forwardly relative to the stop sleeve 19 until its radially inwardly directed ring-like projection contacts a stop ring 41 fitted into the radially outer: .
surface of the stop sleeve 19. When the actuating sleeve is moved forwardly, the bead 5a is removed from the groove l9c and the rear end 38b of the connecting element 38 is moved out of the corresponding catch recess l9b.
Compare Figure 3, where the actuating sleeve is displaced forwardly out of engagement with the stop sleeve, with Figure 2 where the actuating sleeve is in engagement with the stop sleeve. Due to the connection between the actuating sleeve 5 and the connection ring 37 afforded by the connecting element 38, as the actuating sleeve is rotated~ the connecting ring is similarly rotated with the connecting ri.ng moving axially relative to the stop sleeve due to the threaded connection 36. As the connection ring is rotated relative to the stop sleeve the catch ball 36 biased by the spring 27 into the correspon-ding groove 28 prevents the stop sleeve from rotating 3~ along with the connection ring :, ~, ', ' ~

6~

As mentioned above, Flgure 3 illustrates the displaced position of the actuating sleeve 5 rela-tive to the stop sleeve 19 with the bead 5a displaced out of the groove l9c and bearin~ against a supporting flank l9d encircling the stop sleeve. The angled shoulder l9d faces toward the front end of the screw driving device, and the bead 5a is biased against the shoulder due to the arrangement of the actuating sleeve 5. ~ccordingly, movemen-t of the actuating sleeve 6 into the position shown in Figure 2 is possible only after displacing the bead over the shoulder 19d and to do this the operator of the device must prov:Lde a corresponding displacing force. :
Having described what is believed to be the best mode by which the invention may be performed, it will be seen that the invention may be particularly defined as follows:
Motor driven screw driving device comprising a housing having a front end and a rear end, a drive unit located within said housing adjacent the rear end thereof, a drive member located within the front end of said housing and extending from the front end of said housing for operative engagement with a screw for driving the screw into a receiving material, an adjustable tor~ue limiting coupling operatively onnecting said drive unit and said drive member, an axially elongated stop sleeve located within and extending in the front end-rear end direction oE said housing and.havi.ng a front end and a rear end, said stop sleeve is adjustably displaceable relative to the housing in the front end-rear end direction thereof, said torque limiting coupling includes an adjusta~le ~;~768~1~
sprin~ element located ~ithin said stop sleeve for adjusting said tox~ue limiting coupling, said stop sleeve includes a depth stop adjacent the front end thereof, said depth stop being displaceable in the front end-rear end direction of said housing relative to said stop sleeve, an actuating sleeve connected to said depth stop ~or rotating said depth stop, said actuating sleeve being displaceable in the ~ront end-rear end direction of sai.d housing, wherein the improvement comprises tha-t said actuating sleeve.includes a connec-ting member for selective interengagement with said stop sleeve so that said actuating sleeve and said stop sleeve can be rotated ::
as a unit.
While speci~icembo~imentso~ the invention have been shown and described in detail to illustrate the application o~ the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

~, .
~ ' ' ' ' "

Claims (3)

1. Motor driven screw driving device comprising a housing having a front end and a rear end, a drive unit located within said housing adjacent the rear end thereof, a drive member located within the front end of said housing and extending from the front end of said housing for operative engagement with a screw for driving the screw into a receiving material, an adjustable torque limiting coupling operatively connecting said drive unit and said drive member, an axially elongated stop sleeve located within and extending in the front end-rear end direction of said housing and having a front end and a rear end, said stop sleeve is adjustably displaceable relative to the housing in the front end-rear end direction thereof, said torque limiting coupling includes an adjustable spring element located within said stop sleeve for adjusting said torque limiting coupling, said stop sleeve includes a depth stop adjacent the front end thereof, said depth stop being displaceable in the front end-rear end direction of said housing relative to said stop sleeve, an actuating sleeve connected to said depth stop for rotating said depth stop r said actuating sleeve being displaceable in the front end-rear end direction of said housing, wherein the improvement comprises that said actuating sleeve includes a connecting member for selective interengagement with said stop sleeve so that said actuating sleeve and said stop sleeve can be rotated as a unit.
2. Motor driven screw driving device, as set forth in Claim 1, including means for securing said actuating sleeve and said stop sleeve in position so that said actuating sleeve and stop sleeve can be rotated as a unit and said means being axially displaceable so that said actuating sleeve can be rotated freely relative to said stop sleeve.
3. Motor driven screw driving device, as set forth in Claim 2, wherein said means comprises a bead at the rear end of said actuating sleeve, an annular groove in said stop sleeve for receiving said bead, a plurality of catch recesses in said stop sleeve arranged to receive such connection element so that rotation of said actuating sleeve through said connecting element effects the rotation of said stop sleeve.
CA000489632A 1984-09-03 1985-08-29 Adjustable motor-operated screw driving device Expired - Fee Related CA1276818C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3432382.1 1984-09-03
DE19843432382 DE3432382A1 (en) 1984-09-03 1984-09-03 MOTORIZED SCREWDRIVER

Publications (1)

Publication Number Publication Date
CA1276818C true CA1276818C (en) 1990-11-27

Family

ID=6244552

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000489632A Expired - Fee Related CA1276818C (en) 1984-09-03 1985-08-29 Adjustable motor-operated screw driving device

Country Status (12)

Country Link
US (1) US4630512A (en)
EP (1) EP0178252B1 (en)
JP (1) JPS6165785A (en)
AT (1) ATE34529T1 (en)
AU (1) AU573150B2 (en)
CA (1) CA1276818C (en)
DE (2) DE3432382A1 (en)
DK (1) DK156885C (en)
ES (1) ES8701007A1 (en)
FI (1) FI80397C (en)
NO (1) NO161544C (en)
YU (1) YU44568B (en)

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Also Published As

Publication number Publication date
NO161544B (en) 1989-05-22
FI80397B (en) 1990-02-28
EP0178252A3 (en) 1986-07-09
US4630512A (en) 1986-12-23
DK156885C (en) 1990-04-09
EP0178252A2 (en) 1986-04-16
YU44568B (en) 1990-10-31
FI853353L (en) 1986-03-04
DK399685A (en) 1986-03-04
JPS6165785A (en) 1986-04-04
FI853353A0 (en) 1985-09-02
DE3562872D1 (en) 1988-06-30
ES546682A0 (en) 1986-11-16
YU130985A (en) 1988-06-30
ES8701007A1 (en) 1986-11-16
JPH0536194B2 (en) 1993-05-28
DK399685D0 (en) 1985-09-02
FI80397C (en) 1990-06-11
NO853449L (en) 1986-03-04
AU4641185A (en) 1986-03-13
DK156885B (en) 1989-10-16
ATE34529T1 (en) 1988-06-15
EP0178252B1 (en) 1988-05-25
AU573150B2 (en) 1988-05-26
DE3432382A1 (en) 1986-03-13
NO161544C (en) 1989-08-30

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