WO2020177805A1

WO2020177805A1 - Torque tool

Info

Publication number: WO2020177805A1
Application number: PCT/DE2020/100062
Authority: WO
Inventors: Guido Schmidt; Thomas BRAKHAGE; Andreas Risse; Leo Sebastian BAYER
Original assignee: Hazet-Werk Hermann Zerver Gmbh & Co. Kg
Priority date: 2019-03-05
Filing date: 2020-01-31
Publication date: 2020-09-10
Also published as: EP3934848B1; DE102019105567A1; EP3934848A1; ES2950243T3; CN113508010A

Abstract

The invention relates to a torque tool, particularly a reversible ratchet (1), having a tool head (2), which has a chamber (5) having a chamber wall (7), a floor (8) and an opening (9). A ratchet wheel (6) having an output element (20) is rotatably mounted in the chamber (5). The chamber (5) is covered on the opening side by a cover (31). According to the invention, the cover (31) has a cover plate (32, 49) and a cover disc (33). The cover plate (32, 49) has an outer side edge (34) directed to the chamber wall (7) having a protruding spring (35). A groove (38) is provided in the chamber wall (7), in which groove the cover plate (32, 49) having the spring (35) is inserted. In the inserted position, the cover plate (32) is secured in position by the cover disc (33).

Description

Torque tool

The invention relates to a torque tool, in particular a switchable ratchet, according to the features in the preamble of claim 1.

Torque tools, such as ratchets or torque wrenches, are hand-operated turning tools with which a torque can be exerted on a workpiece, usually a screw or nut.

In particular, the invention relates to a reversible ratchet. This is a screwing tool with which a rotary movement in a certain direction is generated in a limited working space by repeated, sector-wise actuation, mostly for loosening or tightening screw connections. Such a ratchet, which is often referred to as a ratchet, produces a rotating one Rotational movement of the ratchet wheel. A reversal of the direction of rotation is possible by means of a switching device that can be operated from the outside.

EP 2 851 155 A2 describes a ratchet with fine teeth. Such is also evident from EP 1 118 433 B1. The ratchets have a tool head with a tool shaft and a handle. A ratchet wheel is rotatably mounted in the tool head. The ratchet wheel has teeth on its outer circumference. Furthermore, a locking piece is provided with teeth which face the external toothing of the ratchet wheel. The locking piece can be moved by means of a switching device along the circumferential direction of the ratchet wheel between a first switching position and a second switching position. In the first or second switching position, one tooth section of the locking piece is in engagement with the toothing of the ratchet wheel for ratcheting in a first or second direction of rotation, while the other tooth section of the locking piece is separated from the toothing of the ratchet wheel.

The ratchet mechanism with the ratchet wheel, the switching device and the locking piece are arranged in a chamber in the tool head. The chamber has a chamber wall, a bottom and an opening. The opening of the chamber is closed by a cover.

In the ratchet tool known from DE 699 30 339 T2, the cover is fixed on the opening side of the tool head by means of screws.

US 2013/0180366 A1 discloses a torque tool in the form of a reversible ratchet, in which the cover is fixed by means of a snap ring.

A locking of the cover and the ratchet wheel arrangement by means of a securing ring or a snap ring is also apparent from US Pat. No. 6,776,071 B1 and US 2003/0 205 113 A1.

Furthermore, EP 2 813 322 B1 includes a ratchet tool in the prior art in which the edge of the housing cover has a clip lip which is clipped as a fastening means into a groove-shaped recess of the housing for closing. On the basis of the prior art, the invention is based on the object of providing a torque tool, in particular a switchable ratchet, with a cover that is improved in terms of assembly technology and function.

The solution to this problem consists in a torque tool, in particular a switchable ratchet, according to the features of claim 1.

Advantageous configurations and developments of the torque tool according to the invention are the subject matter of the dependent claims 2 to 10.

The torque tool has a tool head that has a chamber with a chamber wall, a bottom and an opening. A ratchet wheel is rotatably mounted in the chamber or in a ratchet wheel chamber belonging to the chamber. The ratchet wheel has an output element, in particular in the form of an external polygon. On the opening side, the chamber is covered by a cover.

According to the invention, the cover has a cover plate and a cover plate. The cover plate has an outer side edge directed towards the chamber wall with at least one protruding tongue. A groove is provided in the chamber wall, into which the cover plate with the tongue or springs is inserted. In this inserted position, the cover plate is secured in position by the installed cover plate.

The cover according to the invention enables an efficient assembly of the components of the ratchet mechanism. Components of the switching mechanism are mounted in a cavity of the tool head belonging to the chamber. The cover plate is then pushed into the groove in the chamber wall above the switching mechanism. This closes the part of the opening located above the switchover mechanism. Due to the design of the cover plate with the spring, this is secured against falling out after insertion. Then the ratchet wheel is used. Then the cover plate is mounted. The cover disk has a central opening with which it encloses the outwardly protruding output element of the ratchet wheel. The cover plate is secured in position by the cover disk. The cover disk itself is secured by a locking ring. The securing ring engages with a first circumferential section in a groove running above the cover disk in the chamber wall. With a second circumferential section, the securing ring engages on an abutment arranged or formed on the rear edge section of the cover plate. The abutment can be formed by a groove arranged in the rear edge section of the cover plate. It is also possible that the abutment is formed by a projection or a step in the rear edge section of the cover plate.

The groove in the chamber wall above the cover plate and the groove in the rear edge section of the cover plate complement each other to form an annular groove and are at the same level. The groove in the chamber wall, in which the cover plate with the tongue or tongues is inserted, lies at a height level different from the height level of the aforementioned grooves, in particular lower with respect to the floor of the chamber.

The locking ring is preferably a spiral ring made of a flat wire, which runs partially bent over one another over the circuit. The grooves in the chamber wall and in the rear edge section of the cover plate form the counter-bearing for the locking ring. To assemble the locking ring, one end of the wire spiral can be easily pulled open and threaded. By rotating the locking ring, the spiral threads into the groove in the chamber wall and into the groove in the cover plate.

The cover plate has a rear edge section directed towards the cover plate, the contour of which is designed to be complementary to the outer circumference of the cover plate.

In practice, the cover plate is round or circular. Correspondingly, the rear edge section of the cover plate is designed in the shape of a circular arc.

Another aspect of the invention provides that the underside of the cover plate has a bearing receptacle in which the inner end of a changeover lever of the changeover device is supported. The bearing receptacle is particularly advantageously formed by a recess in the underside of the cover plate. The inner end of the switching lever has a bearing seat which is supported in the bearing receptacle or the recess.

Optionally, the cover plate can also be fixed by means of an adhesive. The adhesive is applied in particular in the area of the tongue and groove connection between the cover plate and the tool head.

The cover disk can be a separate component of the cover. It is also possible that the cover disk is part of the ratchet wheel or is preferably permanently connected to the ratchet wheel. In this way, the cover plate and the ratchet wheel form a unit and can be assembled together.

The invention is described in more detail below with reference to drawings. Show it:

FIG. 1 shows a torque tool according to the invention in the form of a switchable ratchet in perspective;

FIG. 2 shows the torque tool in a view from below;

FIG. 3 shows the torque tool in a view from above;

Figure 4 shows the tool head of a torque tool with mounted

Ratchet mechanism partially in section;

FIG. 5 shows a perspective view of the tool head with a view into the empty chamber of the tool head;

FIG. 6 shows a cover plate in a perspective view;

FIG. 7 the cover plate in a different perspective;

FIG. 8 the cover plate in a perspective view from below;

FIG. 9 a cover disk; FIG. 10 a locking ring;

FIG. 11 shows the tool head during an assembly process for the cover plate;

FIG. 12 shows the tool head of a torque tool during assembly of the ratchet wheel;

FIG. 13 shows an alternative embodiment of a ratchet wheel;

FIG. 14 the ratchet wheel in a side perspective;

FIG. 15 shows the torque tool with the cover plate and ratchet wheel in place before its assembly;

FIG. 16 shows the tool head of a torque tool in a perspective view with an alternative embodiment of a cover plate;

FIG. 17 shows the tool head according to FIG. 16 partially in section and

18 shows the cover plate according to the illustration of FIGS. 16 and 17 in one

Perspective.

FIGS. 1 to 3 show a torque tool in the form of a switchable ratchet 1. The ratchet 1 has a tool head 2 which is connected to a tool shank 3. A handle 4 is located on the end of the tool shaft 3 opposite the tool head 2.

A chamber 5 is formed in the tool head 2. In the chamber 5 a ratchet wheel 6 and the components of a ratchet and switching mechanism are mounted. The chamber 5 has a chamber wall 7, a bottom 8 and an opening 9 (see also FIGS. 4 and 5 in this regard). The chamber 5 in the tool head 2 comprises a circular ratchet wheel chamber 10. The ratchet wheel 6 is rotatably mounted in the ratchet wheel chamber 10. The ratchet wheel 6 has a circular bearing extension 11 which is mounted in a bore 12 in the base 8 of the tool head 2. Furthermore, a cavity 13, which is open to the ratchet wheel chamber 10 and has circular-arc-shaped rear wall sections 14, belongs to the chamber 5. A locking piece 15 is or will be in the cavity 13 recorded. The shank-side section 16 of the tool head 2 within the chamber 5 is stepped. The cavity 13 is delimited as an extension to the tool shank 3 by a bearing section 17 of the tool head 2. A substantially U-shaped recess 18 is provided above the cavity 13, which recess extends over the bearing section 17 in the direction of the tool shank 3. The bearing section 17 is traversed transversely by a bore 19.

An output element 20 in the form of an external square is used to transmit a torque generated by force on the handle 4 via the tool shaft 3 to the tool head 2 and the ratchet wheel 6 located therein about an axis of rotation to a workpiece. In the exemplary embodiment of the ratchet 6 shown here, the output element 20 is a one-piece component of the ratchet 6 made of the same material. The ratchet 6 has a toothing 21 on its outer circumference. This is a fine toothing on the outer circumference of the ratchet wheel 6.

The direction of rotation of the ratchet wheel 6 can be adjusted by means of a switching device 22 that can be actuated from the outside. The locking piece 15 is arranged in the cavity 13 which is open towards the ratchet wheel chamber 10. The locking piece 15 is displaceable in the cavity 13 along a circumferential section of the chamber 5 by the switching device 22. The locking piece 15 has a toothing on its side facing the ratchet wheel 6. By means of the switching device 22, the engagement of the toothing of the locking piece 15 in the toothing 21 of the ratchet wheel 6 for the transmission of a torque can be set in one direction of rotation.

The switching device 22 comprises a switching lever 23 with a pin body 24 rotatably mounted in the bore 19 in the tool head 2. The pin body 24 has a connector 25 protruding in the direction of the locking piece 15. The connector 25 engages in a pocket-like recess 26 on the back of the locking piece 15. In the connector 25, a longitudinal bore is provided in which a spring sleeve, not shown here, consisting of a sleeve and a compression spring, is incorporated. The spring-loaded sleeve rests with its end face against a support surface in the recess 26. Furthermore, a latching mechanism 27 is provided, by means of which the switching lever 23 can be latched in a switching position. The latching mechanism 27 has a spherical body 28 and a compression spring 29. The spherical body 28 and the compression spring 29 are arranged in a bore 30 in the tool head 2. On the rear side of the pin body 24 facing the spherical body 28, the latter has two detent detents, not shown here. These have a contour matched to the contour of the spherical body 28. The detents are arranged on the circumference of the pin body 24 at a distance from one another and each determine a switching position.

The opening 9 of the chamber 5 is covered by a cover 31. The cover 31 has a cover plate 32 and a cover disk 33. The cover plate 32 is U-shaped or tongue-shaped. The cover plate 32 is pushed into the recess 18 and covers the part of the chamber 5 above the cavity 13 and the switching device 22. Details of the cover plate 32 are shown in FIGS. 6, 7 and 8. A cover disk 33 is shown in FIG. 9.

The cover plate 32 has an outer side edge 34 directed towards the chamber wall 7. Projecting springs 35 are formed on the side edge 34. These each extend on the sides of the cover plate 32, starting from the rear edge section 36 of the cover plate 32 facing the ratchet wheel 6 in the direction of the front arch section 37. A groove 38 is provided in the chamber wall 7. This extends circumferentially in the wall section of the chamber wall 7 that delimits the recess 18. The cover plate 32 is pushed into the groove 38 with the tongues 35. In this position, the cover plate 32 is then secured in position by the cover disk 33. For this purpose, the cover disk 33 is guided with its central opening 39 over the output element 20 and placed on the front collar section 40 of the ratchet wheel 6.

The assembled cover disk 33 is secured by a locking ring 41. This is shown in FIG.

The rear edge section 36 of the cover plate 32 directed towards the cover disk 33 has a complementary design to the outer circumference of the cover disk 33 Contour on. As FIG. 9 shows, the cover disk 33 is designed in the shape of a circular ring. Correspondingly, the rear edge section 36 of the cover plate 32 is designed in the shape of a circular arc or circular arc section.

During assembly, the components of the switching device 22 and the latching mechanism 27 are assembled including the locking piece 15. The cover plate 32 with the springs 35 is then pushed laterally into the groove 38 in the chamber wall 7 (see FIG. 11). The cover 31 fills the recess 18 and covers the flea space 13 and the bearing section 17 including the bore 19. In this way, the components of the switching device 22 or the latching mechanism 27 are already secured in position.

As the illustration in FIGS. 7 and 8 show in particular, the cover plate 32 has a bearing receptacle 43 in the form of a recess on its underside 42. The bearing receptacle 43 has parallel side walls 44 which are connected to one another by a circular arc section 45. It can be seen that the lateral springs 35 of the cover plate 32 are interrupted or separated from one another by the slot-shaped recess.

The inner end 46 of the switching lever 23 is supported in the bearing receptacle 43 (FIG. 5).

After the cover plate 32 has been mounted, the cover disk 33 is guided with its central opening 39 over the polygonal output drive 20 and placed on the front side of the ratchet wheel 6. As already mentioned, the rear edge section 36 of the cover plate 32 is matched to the contour of the outer circumference of the cover disk 33. In this way, the cover plate 32 is secured in its position by the cover disk 33. The cover disk 33 is fixed by the locking ring 41.

A groove 47 extending over the circumference of the chamber wall 7 in the region of the ratchet wheel chamber 10 is provided in the chamber wall 7 above the cover disk 33. Furthermore, an abutment in the form of a groove 48 is arranged in the rear edge section 36 of the cover plate 32. The two grooves 47 and 48 correspond to one another and complement one another to form an abutment for the securing ring 41. The securing ring 41 is designed as a spiral ring which consists of a flat wire is wound. By opening the ends of the spiral ring, it can be threaded into grooves 47, 48 that function as an abutment. When mounted, the securing ring 41 engages with a first circumferential section in the groove 47 running above the cover disk 33 in the chamber wall 7 and with a second circumferential section in the groove 48 arranged in the rear edge section 36 of the cover plate 32. In this way, an efficient, simple and stable assembly of the components of the ratchet mechanism of the ratchet 1 is guaranteed. The assembled arrangement with inserted securing ring 41 can be seen in FIG.

In the exemplary embodiment described above, the cover disk 33 is a separate component and, together with the cover plate 32, forms the cover 31.

Figures 13, 14 and 15 show an embodiment of a ratchet wheel 6 'and a ratchet 1' equipped therewith. The cover disk 33 'is a one-piece component of the ratchet wheel 6' made of the same material. It can be seen that the cover disk 33 ′ is arranged above the circumferential toothing 12. The cover disk 33 'is accordingly mounted together with the ratchet wheel 6'. When the ratchet wheel 6 'is inserted, the cover plate 33' rests on or in the rear edge section 36 of the cover plate 32 and secures it in its position so that the cover plate 32 cannot slip out of its mounting position. The position of the ratchet wheel 6 'is then again secured, as described above, by means of the securing ring 41. This is illustrated by FIG.

Figures 16, 17 and 18 show a further embodiment of the tool head 2 of a torque tool or ratchet 1 according to the invention with an alternative embodiment of a cover plate 49. Otherwise, the ratchet 1 corresponds to the embodiment described above, so that corresponding components are provided with the same reference numerals . The above description applies accordingly.

The cover plate 49 has an abutment in the form of a projection 51 in its rear edge section 50. For this purpose, the rear region 50 is designed to be stepped over its arcuate or segment-shaped course. The securing ring 41 engages over the projection 51 with its second circumferential section. In this way, the securing ring 41 engages the abutment formed in the rear edge section 50 or the projection 51 and holds the cover plate 49 in its position.

Reference number:

1 - ratchet

1 'ratchet

2 - tool head

3 - tool shank

4 - handle

5 - chamber

6 - ratchet wheel

6 'ratchet wheel

7 - chamber wall

8 - floor

9 - opening

10 - ratchet chamber

11 - bearing process

12 - bore

13 - cavity

14 - rear wall section

15 - locking piece

16 - shaft-side section of 2

17 - storage section of 2

18 - recess

19 - bore

20 - output element

21 - toothing

22 - switching device

23 - switch lever

24 - pin body

25 - nozzle

26 - recess

27 - locking mechanism

28 - spherical body

29 - compression spring - Drilling

- cover

- cover plate

- cover disk

'- cover disk

- margin

- Feather

- rear edge portion of 32 - arch portion

- Nut

- opening

- collar section

- locking ring

- bottom of 32

- Stock taking

- sidewalls of 43

- arc segment

- inner end of 23

- Nut

- cover plate

- rear edge portion of 49 - protrusion

Claims

1. Torque tool, in particular switchable ratchet (1), with a tool head (2) which has a chamber (5) with a chamber wall (7), a base (8) and an opening (9), wherein in the chamber (5 ) a ratchet wheel (6) is rotatably mounted and the chamber (5) is covered on the opening side by a cover (31), characterized in that the cover (31) has a cover plate (32, 49) and a cover plate (33, 33 ') wherein the cover plate (32, 49) has an outer side edge (34) directed towards the chamber wall (7) with a protruding tongue (35) and a groove (38) is provided in the chamber wall (7) into which the cover plate ( 32, 49) is inserted with the spring (35) and is secured in position by the cover plate (33, 33 ').

2. Torque tool according to claim 1, characterized in that the cover plate (32, 49) has a rear edge section (36, 50) directed towards the cover disk (33, 33 '), the contour of which is complementary to the outer circumference of the cover disk (33, 33') is trained.

3. Torque tool according to claim 1 or 2, characterized in that the cover plate (33) with a central opening (39) encloses an output element (20) of the ratchet wheel (6).

4. Torque tool according to one of claims 1 to 3, characterized in that the cover plate (33, 33 ') are secured by a locking ring (41).

5. Torque tool according to claim 4, characterized in that the securing ring (41) with a first circumferential section in a groove (47) running above the cover disk (33) in the chamber wall (7) and with a second circumferential section on a rear edge section ( 36, 50) engages the cover plate (32) provided abutment.

6. Torque tool according to claim 5, characterized in that the abutment is formed by a groove (48) or a projection (51) in the rear edge portion (36, 50) of the cover plate (32, 49).

7. Torque tool according to one of claims 1 to 6, characterized in that the underside (42) of the cover plate (32, 49) has a bearing receptacle (43) in which the inner end (44) of a changeover lever (23) is supported.

8. Torque tool according to claim 7, characterized in that the bearing receptacle (43) is formed by a recess in the underside (42) of the cover plate (32, 49).

9. Torque tool according to one of claims 1 to 8, characterized in that the cover plate (32, 49) is fixed in the groove (38) by means of an adhesive.

10. Torque tool according to one of claims 1 to 9, characterized in that the cover plate (33) is part of the ratchet wheel (6 ') or is connected to the ratchet wheel (6').