DE202005007533U1 - Torque tool used as a ratchet or spanner comprises a clamping ring with a slot displaceably arranged on a shaft and clamped to the shaft by a tension ring, an intermediate ring surrounding the clamping ring, and a removal-preventing device - Google Patents

Abstract

Torque tool, especially a ratchet or torque spanner, comprises a tool head, a shaft (4), a handle, a tube section (6), and a tension ring (25). A clamping ring (27) with a slot displaceably arranged on the shaft is clamped to the shaft by the tension ring. An intermediate ring (29) surrounds the clamping ring and the clamping ring has a stop for positioning the intermediate ring and a removal-preventing device (14) restricting the displacement of the shaft in the tube section. Preferred Features: The clamping ring and a support ring (44) are made of plastic and the intermediate ring is made of metal.

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 or assemblies for use.

Torque Tools be in different sizes that each cover a specific torque range and in different designs offered. 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 so the shaft can be locked relative to the handle. The 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.

The Torque tool has a tool head and a with the Tool head connected shaft and a handle, wherein the Shaft telescoped in a coupled with the handle tube section stored and fixed by an end on the pipe section Locking ring is lockable.

crux invention forms the measure, that on the shaft a longitudinally slotted clamping ring is arranged displaceable, which under the influence of the clamping ring is clamped with the shaft. When fixing the clamping ring on the pipe section the clamping ring is clamped non-positively with the shaft. This is a force acting from the clamping ring on the clamping ring axial force in a implemented radial clamping force of the clamping ring. So that the clamping ring does not deform under the influence of the clamping ring, the Clamping ring on the outer circumference supported by an intermediate ring, which encloses the clamping ring. For positional orientation of the intermediate ring on the clamping ring is on Clamping ring provided a stop. Furthermore, the torque tool according to the invention a the displacement of the shaft in the pipe section limiting Ausziehsicherung on. As a result, an end stop is formed, which is the maximum Retraction of the shaft in the pipe section pretends and unintentional pulling out prevents the shaft from the pipe section.

essential to the invention is 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 allows becomes. The one with the longitudinal slot provided clamping ring is displaceable in the pipe section on the shaft arranged. End of the pipe section of the clamping ring can be fixed. When determining the clamping ring on the pipe section of the clamping ring clamped radially with the shaft under the influence of the clamping ring and the shaft relative to the pipe section arrested.

The invention enables a structurally simple and reliably functioning manner a continuous length adjustment of the torque tool or the shaft in the pipe section. To adjust the clamping ring is released. The shaft can then be moved longitudinally in the tube section of the hand tool and the desired length of the torque tool can be adjusted. Subsequently, the clamping ring is fixed and this ensures the locking between the shaft and pipe section via the clamping ring. The reliable support of the clamping ring through the intermediate ring is ensured by the stop on the clamping ring. This avoids that the intermediate ring can slip over the clamping ring and ensures that the clamping ring when clamping the assembly located above the clamping ring and encloses this.

The length adjustment is infinitely variable between a minimum length and a maximum length of the torque tool possible. The maximum length of the Torque tool is limited by the invention provided Ausziehsiche tion, which also unintentionally pulling out of the shaft prevents the pipe section.

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 one for the practice regarded as particularly advantageous embodiment the pull-out device comprises one in a transverse bore of the shaft under the inclusion of a compression spring arranged locking pin. Furthermore, on the inner circumference of the pipe section in the area of the free End of the pipe section provided an internal groove. In the inner groove reaches the locking pin when reaching the maximum extension length of Shaft locking for engagement.

at the length adjustment of the torque tool, the shaft is moved in the pipe section. in this connection the locking pin lies with its front side under the influence the compression spring on the inner circumference of the pipe section. As soon as the Shaft pulled out so far that the locking pin in the area the inner groove passes, the locking pin is pushed by the compression spring moved into the inner groove and locks a further extension movement of the shaft opposite the pipe section. The inventively provided pull-out works reliably and susceptible to interference.

The Inner groove has on its side facing the handle a circumferential sliding bevel on. The slip slope ensures that the locking bolt when telescoping Shaft and tube section shifted back against the force of the compression spring so that a smooth insertion of the shaft in the pipe section guaranteed is. Conveniently, is running? sliding bevel towards the rear to the inner tube at an angle of 20 °.

Of the Inner diameter of the intermediate ring and the outer diameter of the clamping ring are coordinated so that the intermediate ring engages over the clamping ring and on the outer circumference supported. At the Clamping is the intermediate ring through the clamping ring on the clamping ring pushed so that a reliable outer support of the clamping ring 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 solve the locking device, so that the shaft can then be moved longitudinally relative to the pipe section. The locking takes place in the reverse manner, by the clamping ring is tightened on the pipe section.

Around To improve the grip of the clamping ring, this is on his outer periphery provided with a profiling, in particular a knurling-like profiling. This measure is beneficial for the practical use, especially in the operation with damp or oily Hand.

to Determination of the shaft in the pipe section and also to support the Shaft in the pipe section when operating the torque tool is on the led in the pipe section End-side shaft portion arranged at least one support ring position-oriented. To facilitate assembly of the support ring is slit longitudinally. The location orientation of the support ring is ensured by an annular groove in the shaft on which the support ring arranged is. In this way, the support ring on the shaft in the longitudinal direction kept immovable.

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 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 a described 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 with extended shaft;

4 on an enlarged scale the section Y of 2 with inserted shaft;

5 in longitudinal section the handle with pipe section;

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

7 a clamping ring in a longitudinal section;

8th the clamping ring in plan view;

9 an intermediate ring in a longitudinal section;

10 the intermediate ring in plan view;

11 a clamping ring in a longitudinal section and

12 the clamping ring in a 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 positions - 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 from metal (see also 5 and 6 ). 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. For assembly reasons, the handle points 5 an opening at the end 8th on. This is when inserting the pipe section 6 in the handle 5 through a stopper 9 locked in the end 7 is mounted. The stopper 9 grips with his cylinder body 10 in the end 7 of the pipe section 6 and is there by a pin 11 fixes the cylinder body 10 and the pipe section 6 transversely interspersed. With his over the end 7 protruding headboard 12 closes the stopper 9 the opening 8th in the handle 5 , The stopper 9 forms with its cylinder body 10 a depth stop T for the shaft 4 in the pipe section 6 (see in particular 4 ).

The shaft 4 is in the pipe section 6 telescopically mounted longitudinally displaceable. This is illustrated by the arrow P. By a locking device 13 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 and also the 4 the torque tool 1 with inserted shaft 4 represents. As already explained, the plug forms 9 a depth stop T for limiting the lower position of the shaft 4 in the pipe section 6 ,

The upper layer of the shaft 4 in the maximum extension length is by a pull-out 14 limited. The pull-out protection 14 includes one in a transverse bore 15 of the shaft 4 under inclusion of a compression spring 16 arranged locking bolt 17 , The locking bolt 17 acts to limit the maximum extension length of the shaft 4 in the pipe section 6 with one on the inner circumference 18 of the pipe section 6 provided inner groove 19 together (see in particular 3 ).

When inserting or removing the shaft 4 in the pipe section 6 is the locking bolt 17 inside in the cross hole 15 relocated and slides with his face 20 on the inner wall 21 of the pipe section 6 along. This is shown by the 2 and 4 , When taking off the shaft 4 from the pipe section 6 arrives the locking pin 17 when reaching the maximum extension length with the inner groove 19 to cover ( 3 ). By the force of the compression spring 16 becomes the locking bolt 17 from the transverse bore 15 moved out and gets to his head end 22 in the inner groove 19 for engagement, allowing a further extension of the shaft 4 Is blocked. It can also be seen that the inner groove 19 on her to the handle 5 pointing page 23 a slip slope 24 having. The slip slope 24 allows the locking pin 17 for inserting the shaft 4 in the pipe section 6 moved out of the locked position and into the transverse bore 15 can be pressed back. As advantageous for practice is a slip 24 viewed at an angle α of 20 ° backwards to the inner wall 21 of the pipe section 6 going out.

The locking device 13 includes a clamping ring 25 and one on the shaft 4 before the shank end 26 of the pipe section 6 displaceable arranged clamping ring 27 made of plastic. The inner diameter d _{iK of} the clamping ring 27 is corresponding to the diameter d _{S of} the shaft 4 tuned (see 6 and 7 ). How the particular 8th can recognize, the clamping ring points 27 a longitudinal slot 28 on. Furthermore, there is an intermediate ring 29 made of metal, inside the clamping ring 25 stored and enclosed by this. The intermediate ring 29 engages and surrounds the clamping ring 27 and supports it from the outside. Based on 9 and 10 it becomes clear that the intermediate ring 29 is closed in itself. At the clamping ring 27 is a stop 30 provided in the form of a radially outwardly extending circumferential collar. By the stop 30 becomes the intermediate ring 29 on the clamping ring 27 Oriented orientation and slippage of the intermediate ring 29 between clamping ring 25 and clamping ring 27 prevented.

Based on 3 and 11 you realize that the clamping ring 25 designed in the manner of a union nut. The clamping ring 25 has a sleeve section 31 with a floor 32 on, in which a passage opening 33 is provided, through which the shaft 4 is guided. At the inner periphery of the sleeve section 31 is a threaded section 34 with an internal thread 35 intended. With the internal thread 35 can the clamping ring 25 on a on the shaft end 26 of the pipe section 6 provided external thread 36 ( 5 ) are screwed. The operation of the locking device 13 takes place by a rotary movement of the clamping ring 25 , To lock the shaft 4 becomes the clamping ring 25 right-handed on the external thread 36 of the pipe section 6 screwed. The release takes place by a reverse, left-handed rotational movement of the clamping ring 25 ,

At the outer circumference 37 is the clamping ring 25 with a profiling 38 provided in the form of a knurl ( 12 , This measure improves the grip of the clamping ring 25 , which is particularly advantageous when operating with wet or oily hands.

With released locking device 13 can the shaft 4 in the pipe section 6 moved longitudinally and the desired length and thus the effective lever 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 25 opposite the pipe section 6 , This is the clamping ring 25 moved axially in the direction of the arrow P1 and the clamping ring 27 against the shank end 26 of the pipe section 6 pressed, causing the clamping ring 27 with the shaft 4 is clamped non-positively. In this way the shaft becomes 4 fixed in the desired position. The intermediate ring 29 grips the clamping ring during the clamping process 27 so that the clamping ring 27 on its outer circumference 39 is supported. As a result, a deformation of the clamping ring 27 avoided during the clamping process. For this purpose, the inner diameter d _{iZ of} the intermediate _ring 29 and the outer diameter d _{aK of} the clamping ring 27 so matched to each other that the intermediate ring 29 the clamping ring 27 positively engages over.

In the 7 and 10 are also the inner diameter of the clamping ring 27 with d _iK and the outer diameter of the intermediate _ring 29 _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 27 a length I _K measured from the stop 30 to the opposite end 40 which is slightly longer than the length I _{Z of} the intermediate ring 29 , In the exemplary embodiment, the difference in length is 2 mm. This measure represents the interaction between clamping ring 25 and clamping ring 27 for tightening the shaft 4 sure, so that's from the clamping ring 25 exerted axial force in a radial clamping force of the clamping ring 27 is implemented. Furthermore, on the intermediate ring 29 at the end 40 a chamfer 41 intended.

In the 2 as well as in the enlarged view of 4 you can see that in the pipe section 6 guided end section 42 of the shaft 4 two support rings 43 . 44 are provided. The support rings 43 . 44 are made of plastic and are longitudinally slotted. In the axial direction are the support rings 43 . 44 arranged at a distance a to each other. The support rings 43 . 44 are in ring grooves 45 . 46 (see also 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.

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 locking device 13 by means of clamping ring 25 and clamping ring 27 respectively.

1

torque tool

2

tool head

3

drive journal

4

shaft

5

handle

6

pipe section

7

End of v. 6

8th

opening

9

Plug

10

cylinder body

11

pen

12

Headboard v. 9

13

Locking device

14

pull-out

15

cross hole

16

compression spring

17

locking pin

18

Inner circumference v. 6

19

inner groove

20

Face v. 17

21

Inner wall v. 6

22

Headboard v. 17

23

Page v. 19

24

sliding bevel

25

clamping ring

26

End of v. 6

27

clamping ring

28

longitudinal slot

29

intermediate ring

30

attack

31

sleeve section

32

Soil v. 25

33

Through opening

34

threaded portion

35

inner thread

36

external thread

37

Outer circumference v. 25

38

profiling

39

Outer circumference v. 27

40

End of v. 27

41

chamfer

42

Section v. 4

43

support ring

44

support ring

45

support ring

45

ring groove

46

ring groove

d _aK

Outside diameter v. 27

d _iK

Inner diameter v. 27

d _aZ

Outside diameter v. 29

d _iZ

Inner diameter v. 29

d _S

Diameter v. 4

I _K

Length v. 27

I _Z

Length v. 29

P

arrow

P1

arrow

T

depth stop

α

angle

a

Distance between 43 u. 44

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 ) mounted telescopically and by an end on the pipe section ( 6 ) fixable clamping ring ( 25 ) is lockable, characterized in that on the shaft ( 4 ) a longitudinally slotted clamping ring ( 27 ) is arranged displaceable, which under the influence of the clamping ring ( 25 ) with the shaft ( 4 ), wherein a clamping ring ( 27 ) enclosing intermediate ring ( 29 ) is provided and the clamping ring ( 27 ) a stop ( 30 ) to the positional orientation of the intermediate ring ( 29 ) and a displacement of the shaft ( 4 ) in the pipe section ( 6 ) limiting pull-out protection ( 14 ) is provided. Torque tool according to claim 1, characterized in that the pull-out protection ( 14 ) one in a transverse bore ( 15 ) of the shaft ( 4 ) incorporating a compression spring ( 16 ) arranged locking bolt ( 17 ) and on the inner circumference ( 18 ) of the pipe section ( 6 ) an inner groove ( 19 ) is provided, in which the locking bolt ( 17 ) for limiting the maximum extension length of the shaft ( 4 ) arrives blocking intervention. Torque tool according to claim 2, characterized in that the inner groove ( 19 ) Handgriffseitig a circumferential slip ( 24 ) having. Torque tool according to one of claims 1 to 3, characterized in that the clamping ring ( 27 ) is longer than the intermediate ring ( 29 ). Torque tool according to at least one of claims 1 to 4, characterized in that the clamping ring ( 25 ) with an internal thread ( 35 ) on one end of the pipe section ( 6 ) provided external thread ( 36 ) 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 ( 42 ) of the shaft ( 4 ) at least one support ring ( 43 . 44 ) is arranged location-oriented. Torque tool according to claim 6, characterized in that the support ring ( 43 . 44 ) is longitudinally slotted. Torque tool according to claim 6 or 7, characterized in that the support ring ( 43 . 44 ) on an annular groove ( 45 . 46 ) of the shaft ( 4 ) is arranged. Torque tool according to at least one of claims 6 to 8, characterized in that two support rings ( 43 . 44 ) are provided at a distance (a) from each other. Torque tool after at least ei nem of claims 1 to 9, characterized in that the clamping ring ( 27 ) and the or each support ring ( 43 . 44 ) made of plastic and the intermediate ring ( 29 ) consist of metal. Torque tool according to at least one of claims 1 to 10, characterized in that the clamping ring ( 25 ) on its outer circumference profiling ( 38 ) having.