DE202005003572U1 - Torque wrench, comprising telescopic shaft secured in position with clamping unit - Google Patents

Abstract

The tool (1), assembled of a tool head (2) with the square segment to be inserted into the socket and an adjacent shaft segment (4) and a second shaft segment (6) with a handle (5), can be adjusted in length as required. A plastic clamping ring with a lateral gap is attached to the joint area of the shaft segments (4, 6) and surrounded by a metal ring. An outer sleeve (14), designed similar to a union nut and provided with a textured outer surface (31), accommodates the arrangement of shaft segments (4, 6), inner ring, and intermediate ring and can be rotated in order to extend or shorten the shaft.

Description

The The invention relates to a torque tool, in particular a ratchet or a torque wrench, according to the characteristics in the preamble of protection claim 1.

at Torque tools, such as ratchets or torque wrenches, acts These are hand-operated tools that provide torque a workpiece, usually a screw or a nut, be exercised can. Such torque tools come in many technical areas for the Assembly of individual elements and assemblies for application.

Torque Tools come in many different sizes, each with a specific torque range Cover and offered in different versions. The size is limited by the power that an average person can muster and the lever length, to which a tool remains manageable.

To increase the possibilities and manageability already telescopic torque tools have been proposed. That's how it looks DE 200 09 679 U1 a torque tool in the form of a wrench before with a sleeve-shaped handle which is slidably mounted on a shaft telescopically. Between the shaft and the handle, an adjusting device is arranged, through which the handle on the shaft is lockable. For this purpose, the shaft has a plurality of annular grooves in which locking balls engage under the influence of a clamping ring and the shaft can be locked relative to the handle. This embodiment is expensive to manufacture. Also, a length adjustment of the shaft can only be done in stages. A similar proposal comes from the U.S. Patent 2,869,410 out.

Also the DE 40 00 650 A1 describes a telescopic torque tool for tightening or loosening screws or nuts, in which a length adjustment of the shaft is possible in predetermined levels.

Of the Invention is based on the prior art, the task, a torque tool of the generic type both constructive as well as for to improve the practical use, so in particular also a stepless length adjustment of the shaft possible is.

The solution This object is according to the invention in a torque tool according to the characteristics of protection claim 1.

crux the invention forms the interaction of the end of the pipe section fixable clamping ring and the displaceable on the shaft clamping ring, whereby a stepless length adjustment of the torque tool is enabled. The one with a longitudinal slot provided clamping ring is in front of the end of the pipe section of the handle arranged displaceable on the shaft. End on the pipe section the clamping ring can be fixed. When fixing the clamping ring At the pipe section, the clamping ring is under the influence of the clamping ring radially clamped with the shaft and the shaft relative to the Tube section locked.

The Invention allows in a structurally simple and reliable way a stepless length adjustment of the torque tool or shaft. To adjust the clamping ring solved. The shank can then be longitudinal in the tube section of the hand tool moved and the desired Length of the Torque tool can be adjusted. Subsequently, the clamping ring is set and over here the clamping ring the locking between the shaft and pipe section ensured.

The length adjustment is infinitely variable between a minimum length and a maximum length of the torque tool possible. The torque tool according to the invention or whose locking device comes with only a few components from, the structurally simple design and are less susceptible to interference.

advantageous Embodiments of the fundamental The idea of the invention is the subject of dependent claims 2 to 11th

At the Determining the clamping ring on the pipe section, the clamping ring with the shaft frictionally braced. Here, a force acting on the clamping ring from the clamping ring Axial force converted into a radial clamping force of the clamping ring. So that the clamping ring is not under the influence of the clamping ring deformed, the clamping ring on the outer circumference supported.

Basically the support the clamping ring by an appropriate design of the clamping ring be realized, for example, by a sleeve portion on the inner circumference of the clamping ring, which engages over the clamping ring during clamping and from the outside supported. As a result, deformation of the clamping ring is avoided during clamping.

In an embodiment considered particularly advantageous for practice, the clamping ring is supported by an intermediate ring which is enclosed by the clamping ring. The inner diameter of the intermediate ring and the outer diameter of the guided on the shaft clamping ring are coordinated so that the intermediate ring engages over the clamping ring and supported on the outer circumference. When clamping the intermediate ring is pushed by the clamping ring on the clamping ring, so that a reliable outer support of the clamping ring is ensured by the intermediate ring.

to Ensuring the clamping effect of the clamping ring this is slightly longer than the intermediate ring. The clamping ring then presses during the clamping process in the axial direction end on the clamping ring, whereby the adhesion between the clamping ring and shaft is effected.

The Determining the clamping ring end on the pipe section is advantageously schraubtechnisch. For this purpose, an internal thread is provided on the clamping ring, with which the clamping ring provided on an end on the pipe section External thread can be screwed on is. The release or tightening the locking device is done by turning of the clamping ring. For this purpose suffice a few turns to release the locking device, so that the shaft can then be moved longitudinally relative to the pipe section. The locking then takes place in the reverse manner, by the clamping ring is tightened on the pipe section.

to guide the shaft in the pipe section and also to support the shaft in the pipe section during operation of the torque tool is on the guided in the pipe section end side shaft portion at least one support ring Oriented orientation. To facilitate the assembly is the support ring slit lengthwise. The orientation of the support ring is ensured by an annular groove in the shaft, arranged in the support ring is. In this way, the support ring on the shaft in the longitudinal direction kept immovable.

The support function of the support ring is further improved, if this in addition an O-ring from a is associated with rubber-elastic material. The O-ring takes over a buffer effect, causing a compression of the support ring at a bending load during the assembly can be avoided or reduced.

Especially advantageous are two support rings at the end region of the shaft spaced apart. This is a stable support and guide of the shaft in the tube section of the handle.

In practice is provided that the clamping ring as well as the or the support rings made of plastic, whereas as an intermediate ring a metal ring used. Bring these materials or material pairings production and application technology and economic advantages.

The Invention is described below with reference to an illustrated in the drawings embodiment described in more detail. Show it:

1 an inventive torque tool with extended shaft in plan view;

2 in side view, partially in vertical longitudinal section, the torque tool with inserted shaft;

3 on an enlarged scale the section X of the 2 ;

4 on an enlarged scale the section Y of 2 ;

5 in the plan view of the handle with pipe section;

6 in the plan view of the tool head with shank;

7 a clamping ring in a vertical longitudinal section;

8th the clamping ring in plan view;

9 an intermediate ring in a vertical longitudinal section and

10 the intermediate ring in the plan view.

The 1 and 2 show a telescopic torque tool according to the invention 1 in the form of a ratchet in two different operating conditions - namely at extended maximum length ( 1 ) and an inserted minimum length ( 2 ).

The torque tool 1 has a tool head 2 with a drive pin 3 and one with the tool head 2 connected shaft 4 as well as a handle 5 made of plastic. With the handle 5 is a pipe section 6 coupled. The handle 5 is on an end 7 of the pipe section 6 pushed and fixed by press fit, which is secured by a two-component adhesive. The stopper 8th interspersed with his to the free end slightly conically widening shaft 9 a recess 10 in the handle 5 and lies with the flat widened headboard 11 on the handle 5 (see also 4 and 5 ).

The shaft 4 is in the pipe section 6 Telesko pierbar longitudinally displaceable stored. This is illustrated by the arrow P. By a locking device 12 can the shaft 4 relative to the pipe section 6 be arrested. In this way, by moving the shaft 4 in the pipe section 6 the length of the torque tool 1 be set. 1 shows the torque tool 1 with extended shaft 4 whereas the 2 the torque tool 1 with inserted shaft 4 represents. To limit the lower position of the shaft 4 in the pipe section 6 is a stop pin 13 provided, which the pipe section 6 transversely interspersed.

The locking device 12 includes a clamping ring 14 and one on the shaft 4 before the shank end 15 of the pipe section 6 displaceable arranged clamping ring 16 made of plastic. The inner diameter d _{iK of} the clamping ring 16 is corresponding to the diameter d _{s of} the shaft 4 tuned (see 6 and 7 ). As in particular the 8th can recognize, the clamping ring points 16 a longitudinal slot 17 on. Furthermore, there is an intermediate ring 18 made of metal, inside the clamping ring 14 stored and enclosed by this. The intermediate ring 18 engages over the clamping ring 16 during the clamping process and supports it from the outside. Based on 9 and 10 it becomes clear that the intermediate ring 18 is closed in itself.

Based on 3 you realize that the clamping ring 14 designed in the manner of a union nut. The clamping ring 14 has a sleeve section 19 with a floor 20 on, in which a passage opening 21 is provided, through which the shaft 4 is guided. At the inner periphery of the sleeve section 19 is a threaded section 22 with an internal thread 23 intended. With the internal thread 23 can the clamping ring 14 on a on the shaft end 15 of the pipe section 6 provided external thread 24 be screwed on. The operation of the locking device 12 takes place by a rotary movement of the clamping ring 14 , To lock the shaft 4 becomes the clamping ring 14 right-handed on the external thread 24 of the pipe section 6 screwed. The release takes place by a reverse left-handed rotary movement of the clamping ring 14 ,

With released locking device 12 can the shaft 4 in the pipe section 6 moved longitudinally and the desired length and thus the effective lever arm of the torque tool 1 be set. After the length is adjusted, the shaft becomes 4 locked. This is done by tightening the clamping ring 14 opposite the pipe section 6 , This is the clamping ring 14 moved axially in the direction of the arrow P1 and the clamping ring 16 against the shank end 15 of the pipe section 6 pressed, causing the clamping ring 16 with the shaft 4 is clamped non-positively. This will cause the stem 4 fixed in the desired position. The intermediate ring 18 grips the clamping ring during the clamping process 16 so that the clamping ring 16 is supported on its outer circumference. As a result, a deformation of the clamping ring 16 avoided during the clamping process. For this purpose, the inner diameter d _{iZ of} the intermediate _ring 18 and the outer diameter d _{aK of} the clamping ring 16 so matched to each other that the intermediate ring 18 the clamping ring 14 can positively overlap.

In the 7 and 10 are also the inner diameter of the clamping ring 16 with d _iK and the outer diameter of the intermediate _ring 18 _denoted by d _aZ .

One recognizes furthermore both in the 3 as well as on the basis of 7 and 9 in that the clamping ring 16 has a length I _K , which is slightly longer than the length I _{Z of} the intermediate ring 18 , In the exemplary embodiment, the difference in length is 2 mm. This measure represents the interaction between clamping ring 14 and clamping ring 16 for tightening the shaft 4 sure, so that's from the clamping ring 14 exerted axial force in a radial clamping force of the clamping ring 16 is implemented.

In the 2 as well as in the enlarged view of 4 you can see that in the pipe section 6 guided end section 25 of the shaft 4 two support rings 26 . 27 are provided. The support rings 26 . 27 are made of plastic and are longitudinally slotted. In the axial direction are the support rings 26 . 27 arranged at a distance a to each other. The support rings 26 . 27 are in ring grooves 28 . 29 (please refer 6 ) of the shaft 4 location-oriented and serve to guide the shaft 4 in the pipe section 6 and for supporting the shaft 4 in the pipe section 6 at a bending stress of the torque tool 1 under load.

Towards the tool head 2 of the shaft 4 seen front support ring 26 is an O-ring 30 assigned. This one is like the support ring 26 in the front ring groove 28 positioned. The O-ring 30 defines an upper stop of the shaft 4 in the maximum length opposite the clamping ring 4 or the clamping ring 16 when taking off the shaft 4 , Furthermore, the O-ring prevents 30 in that the clamping ring 16 with pulled-out shaft 4 over the ring groove 28 can slip.

The torque tool according to the invention 1 is infinitely variable in length between the minimum length and the maximum length. The lock can easily in the desired length position by the clamping ring 14 and the clamping ring 16 respectively. To improve the grip of the clamping ring 14 is its exterior surface by a corrugation 31 profiled.

1

torque tool

2

tool head

3

drive journal

4

shaft

5

handle

6

pipe section

7

End of v. 6

8th

Plug

9

Shank v. 8th

10

recess

11

Headboard v. 8th

12

Locking device

13

stop pin

14

clamping ring

15

shank end v. 6

16

clamping ring

17

longitudinal slot

18

intermediate ring

19

sleeve section

20

ground

21

Through opening

22

threaded portion

23

inner thread

24

external thread

25

Section v. 4

26

support ring

27

support ring

28

ring groove

29

ring groove

30

O-ring

31

knurl

P

arrow

P1

arrow

a

distance

d _iK

Inner diameter v. 16

d _aK

Outside diameter v. 16

d _iZ

Inner diameter v. 18

d _aZ

Outside diameter v. 18

d _s

Diameter v. 4

I _K

Length v. 16

I _Z

Length v. 18

Claims (11)

Torque tool, in particular ratchet or torque wrench, with a tool head ( 2 ), one with the tool head ( 2 ) connected shaft ( 4 ) and a handle ( 5 ), whereby the shaft ( 4 ) in one with the handle ( 5 ) coupled pipe section ( 6 ) telescopically mounted and by a clamping ring ( 14 ) is lockable, characterized in that on the shaft ( 4 ) in front of the pipe section ( 6 ) one with a longitudinal slot ( 17 ) provided clamping ring ( 16 ) arranged displaceable and the clamping ring ( 14 ) at the end on the pipe section ( 6 ), wherein the clamping ring ( 16 ) under the influence of the clamping ring ( 14 ) with the shaft ( 4 ) is clamped. Torque tool according to claim 1, characterized in that the clamping ring ( 16 ) by one of the clamping ring ( 14 ) included intermediate ring ( 18 ) is supported. Torque tool according to claim 2, characterized in that the intermediate ring ( 18 ) the clamping ring ( 16 ) overlaps. Torque tool according to claim 2 or 3, characterized in that the clamping ring ( 16 ) is longer than the intermediate ring ( 18 ). Torque tool according to at least one of claims 1 to 4, characterized in that the clamping ring ( 14 ) with an internal thread ( 23 ) on a pipe section ( 6 ) provided external thread ( 24 ) can be screwed on. Torque tool according to at least one of claims 1 to 5, characterized in that in the pipe section ( 6 ) end section ( 25 ) of the shaft ( 4 ) at least one support ring ( 26 . 27 ) is arranged location-oriented. Torque tool according to claim 6, characterized in that the support ring ( 26 . 27 ) is longitudinally slotted. Torque tool according to claim 6 or 7, characterized in that the support ring ( 26 . 27 ) in an annular groove ( 28 . 29 ) of the shaft ( 4 ) is arranged. Torque tool according to at least one of claims 6 to 8, characterized in that the support ring ( 26 ) an O-ring ( 30 ) assigned. Torque tool according to at least one of claims 6 to 9, characterized in that two support rings ( 26 . 27 ) are provided at a distance (a) from each other. Torque tool according to claim 1, one of claims 2 to 4 and at least one of claims 6 to 10, characterized in that the clamping ring ( 16 ) and the or each support ring ( 26 . 27 ) made of plastic and the intermediate ring ( 18 ) consist of metal.