EP4359172A1

EP4359172A1 - Torque tool

Info

Publication number: EP4359172A1
Application number: EP22732387.0A
Authority: EP
Inventors: Patrick Klatt; Christian BALLSIEPER
Original assignee: Hazet Werk Hermann Zerver GmbH and Co KG
Current assignee: Hazet Werk Hermann Zerver GmbH and Co KG
Priority date: 2021-06-23
Filing date: 2022-05-24
Publication date: 2024-05-01
Also published as: TW202304661A; US20240261946A1; CN116981544B; TWI809898B; WO2022268252A1; JP2024516587A; CN116981544A; DE202021103380U1

Abstract

The invention relates to a torque tool, in particular a torque screwdriver (1), having a handle (2) and an adjusting body (7), which can be rotated about the longitudinal axis (L) of the handle (2) and is intended for adjusting a torque, and also having a display (3) for an adjusted torque, the display comprising a digit roller counter (10), wherein the digital counter (10) has at least two digit rollers (11, 12, 13). According to the invention, the digit roller counter (10) is arranged in a hollow-cylindrical length portion (14) of the handle (2), which has a viewing window (16) through which the adjusted torque is visible, and the digit roller counter (10) has, along its central axis (ML), a passage (17), through which a shaft portion (18) is guided, wherein incorporated between two digit rollers (11, 12 and/or 12, 13) is a carrier disc (30), which is arranged for conjoint rotation in the handle (2), and the carrier disc (30) is rotatably assigned a selector wheel (33), which has a drive-toothing formation (39) and a selector-toothing formation (40), and wherein a digit roller (11, 12, 13) has an outer digit ring (20), which has a first ring portion (21) with a drive-toothing formation (22) and a second ring portion (23) with a selector element (24), and wherein the adjusting body (7) has means for transmitting a rotary movement of the adjusting body (7) to the digit roller (11), which is arranged on the adjusting body.

Description

torque tool

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

Torque tools, such as torque screwdrivers, are hand-held tools used to apply controlled torque to a workpiece, typically a bolt or nut. With adjustable torque tools, a defined tightening torque can be applied in order to ensure the necessary clamping force or assembly preload between the components to be connected.

In the case of torque screwdrivers, a release mechanism is usually housed in the handle. An adjusting device including a display for a torque to be adjusted is also provided in the handle or on the handle. The desired torque is set by compressing a compression spring, which is connected to an adjusting mechanism, usually a threaded spindle Adjusting body is rotated relative to a fixed part of the handle on the handle.

An adjustable torque screwdriver is known from US Pat. No. 9,421,675 B2. The set torque can be read on a display that is designed as a scale or nonius.

DE 202013 103740 U1 includes a torque wrench with a torque indicator as part of the prior art. The torque wrench has a display device for the set torque. The display device includes a digit roller counter with several digit rollers, which are linked via a gear. The digit rollers are arranged in a housing which grips the handle on the outside. The axle shaft of the gearbox goes through the gears on one side of the housing. To accommodate the roller counter, the housing must be in two parts. The housing is formed by an upper cover and a lower cover which face each other and are fixed to the handle of the torque wrench. This design is in need of improvement in terms of installation space and functionality.

Proceeding from the state of the art, the invention is based on the object of improving a torque tool, in particular a torque screwdriver, in terms of space, application and function.

The solution to this problem consists in a torque tool, in particular a torque screwdriver, according to claim 1.

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

Design and modifications of features of the torque tool, which individually or in combination make the invention technically advantageous, also result from the description and the accompanying drawings.

A torque tool according to the invention is in particular a torque screwdriver. The torque tool has a handle and an adjusting body that can be rotated about the longitudinal axis of the handle Setting a torque on. A set torque or the set value of the torque is shown on a display and can be read through a viewing window. The display includes a digit roller counter, which has at least two digit rollers.

According to the invention, the roller counter is arranged in a hollow-cylindrical longitudinal section of the handle. The viewing window is provided in the longitudinal section, through which the setting value of the torque can be seen. The viewing window is formed by a recess or an opening in the wall of the handle in the hollow-cylindrical longitudinal section. The roller counter has a passage in its central axis, through which a shaft section is guided. A carrier disc, which is non-rotatably arranged in the handle, is integrated between two digit rollers. A ratchet wheel is rotatably assigned to the carrier disk. The ratchet wheel has a drive toothing and a switching toothing. A digit roller has an outer digit ring provided with numbers, which has a first ring section with an inner drive toothing and a second ring section with a switching element. The setting body has means for transmitting a rotational movement of the setting body, the digit roller arranged on the side of the setting body.

The torque tool according to the invention is improved in terms of installation space and application as well as functionality. In the torque tool according to the invention, a compact roller counter with an internal gear chain is implemented in the handle. The roller counter is arranged in a hollow-cylindrical longitudinal section of the handle.

Preferably, the means for transmitting the rotational movement of the adjusting body and the drive toothing of the first digit roller adjacent to the adjusting body, ie the digit roller on the adjusting body side, are permanently engaged.

The setting body is permanently radially coupled to the first digit roller on the side of the setting body. This is done via drivers on the setting body and the drive toothing on the first digit roller. The first digit roll reflects the lowest setting value. Due to the permanent coupling, every rotary movement of the setting body is transferred to the first digit wheel. On the opposite side, the first digit roller has a switching element. This is preferably an inner toothed segment. A carrier disk is located between two digit rollers, ie, for example, the first digit roller on the actuator body side and the second digit roller that follows it. The carrier disk has an eccentric shaft journal on which the ratchet wheel is mounted or held. The carrier disc is non-rotatably connected to the handle. For this purpose, the carrier disk has, in particular, a radial projection which engages in a groove-shaped or slot-shaped recess on the inner circumference of the hollow-cylindrical longitudinal section. The ratchet wheel has a drive toothing and a switching toothing. The drive toothing interacts with the drive toothing of a digit roller. The switching toothing interacts with the switching element of a digit roller. The switching element on one side of the carrier disc ensures that after each full revolution the following digit roller is increased or decreased by a numerical value. At least two digit rolls are required for implementation. The system can be expanded in technically required and sensible numbers with a digit roller, a carrier disk and a ratchet wheel. Since the digit wheels each have a switching element, each full revolution of the previously arranged digit wheel causes a change of the following digit wheel by one digit. The number of switching elements determines how often the following digit wheel is advanced in one revolution. The number of switching elements and the number of forwarding are therefore proportional to each other.

The invention provides a torque tool, in particular a torque screwdriver, with a display in which the entire display system with the roller counter can be pushed into the handle as a unit. This takes place from the adjusting body side into the hollow-cylindrical longitudinal section of the handle. The roller counter and its components carry each other. The roller counter is mounted in the handle. This is achieved by the non-rotatable arrangement of the carrier discs in the handle. Centrally through the roller counter and the passage lying in the central axis is a Shaft section out. This particularly advantageous aspect of the torque tool according to the invention enables the connection or coupling of the components of the torque tool on the actuating body side and the components of the torque tool arranged on the output side of the roller counter, in particular the torque setting mechanism and an adjustment arrangement.

An advantageous embodiment provides that the carrier disc has a radial projection which protrudes or engages in a recess in the handle. In this way, an abutment or the abutment of the digit roller counter is realized via the carrier disk.

A further particularly preferred embodiment provides that the setting body has a socket with drivers which engage with the drive toothing of the digit roller on the side of the setting body. The drivers are preferably arranged on the end face of the connecting piece.

The shaft section guided through the central passage in the roller counter is preferably part of an adjustment shaft which is part of an adjustment arrangement via which a comparison between the setting value of a torque indicated by the roller counter and the triggering torque can be carried out.

A digit roller has a hub and a disk body arranged between the hub and the outer digit ring.

The ratchet wheel is mounted on a shaft journal which is eccentrically arranged on the carrier disc.

A carrier disc has a cup-shaped center piece. A radial disc section extends from the center piece concentrically around the center piece. The ratchet wheel is arranged in a receptacle of the carrier disc, which is arranged in the area of the outer circumference of the center piece. The disc section has an opening in the area of the receptacle. The ratchet wheel protrudes through the opening in some areas with the drive toothing, so that the number roller to the downstream pointing section of the drive toothing comes into engagement with the drive toothing of the digit roller connected downstream.

The switching toothing connects to the front side of the driving toothing. The drive teeth have a number of teeth and the ratchet teeth have a number of ratchet teeth, the number of drive teeth being twice the number of ratchet teeth. The ratio of the number of driving teeth to the number of switching teeth is 2:1. The number of driving teeth is therefore twice as large as the number of switching teeth.

The ratchet teeth are arranged at an angle to one another on a pitch circle, with each ratchet tooth being arranged congruently with a drive tooth. In the case of a ratchet wheel with six driving teeth, this correspondingly has three ratchet teeth which are arranged at an angle of 120° to one another.

Another practically advantageous embodiment of the digit roller counter is that a digit roller has an annular collar on the switching element side, which collar has a recess in the area of the switching element. The ring collar covers the ratchet teeth of the ratchet teeth except for one ratchet tooth. In each case one protruding switching tooth interacts with the switching element of a digit roller. After each complete revolution of a digit roller, the protruding switching tooth is caught by the switching element. The ratchet tooth is rotated further by 120° so that the next ratchet tooth protrudes from the ring collar. With the further turning of the switching tooth by 120°, the downstream digit roller is turned further by one counter.

While the first digit wheel, driven by the actuating body, performs a rotary movement, the ratchet wheel is held until, after a complete revolution, the actuating element of the first digit wheel engages with a ratchet tooth of the ratchet wheel and rotates it further by a circular arc segment, which causes the digit wheel to be moved by one digit is equivalent to. The following digit roll is consequently advanced or rotated by one digit. While the first digit wheel completes a further revolution, the second digit wheel rotates due to the permanent engagement between the drive toothing of the ratchet wheel and the second digit wheel and that of these subsequent further number rolls is not possible. Only when the second digit roller has itself completed a complete revolution is the third digit roller following the second digit roller switched over by one digit position.

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 torque screwdriver in a side view;

FIG. 2 shows a longitudinal section through the representation of FIG. 1 along the line AA;

FIG. 3 shows detail A corresponding to the representation of FIG. 2 in an enlarged representation;

Figure 4 is a perspective view of the handle of the torque

screwdriver;

FIG. 5 shows a first sectional representation through the handle according to the representation of FIG. 4;

Figure 6 is a second sectional view through the handle according to

Representation of Figure 4;

FIG. 7 is an end view of the handle from the adjusting body side and

FIG. 8 shows detail B from FIG. 7 on an enlarged scale;

FIG. 9 components of the torque screwdriver in an exploded view;

FIG. 10 shows a section through the representation of FIG. 9 along the line AD-AD;

FIG. 11 shows a section through the representation of FIG. 10 along the line AG-AG in a perspective view; FIG. 12 shows a section through the representation of FIG. 10 along the line AF-AF in a perspective view;

FIG. 13 shows the digit rollers of a digit roller counter in a perspective view;

FIG. 14 shows a perspective view of an adjusting body of a torque screwdriver;

FIG. 15 shows a vertical section through a roller counter;

FIG. 16 shows the components of the digit roller counter corresponding to the representation in FIG. 15 in an exploded view;

Figure 17 is a section through the representation of Figure 3 along the line U-U;

Figure 18 is a section through the view of Figure 3 along lines T-T;

FIG. 19 shows the components of a digit roller counter in a perspective exploded view;

Figure 20 shows the components of the digit roller counter from a different perspective and

FIG. 21 shows a further perspective exploded view of the components of a digit roller counter.

A torque tool according to the invention in the form of a torque screwdriver 1 and components thereof are described with reference to FIGS.

The torque screwdriver 1 has a handle 2 and a display 3 for a set torque and an output 4 . Integrated in the handle 2 is a setting device 5 for setting a specific torque or a defined tightening torque. The setting device 5 comprises an actuating mechanism, not described in detail here, with which the desired torque is set by compressing a compression spring 6 . The setting device 5 and its setting mechanism interact with a setting body 7 on the handle 2 . The adjusting body 7 can be rotated about the longitudinal axis L relative to the handle 2 . The torque is adjusted by rotating the adjusting body 7 relative to the fixed part of the handle 2 . In order to secure the torque set in each case against unintentional adjustment, the adjusting body 7 is fixed by means of a lock 8 which is actuated via a locking body 9 .

The output 4 of the torque screwdriver 1 is arranged on the front side in the handle 2 . The output 4 is designed to accommodate exchangeable insertion tools. The output 4 is equipped with a holding system designed for this purpose so that different insertion tools can be exchanged.

The display 3 for a set torque has a digit roller counter 10 with several digit rollers 11, 12, 13 arranged one behind the other. In the exemplary embodiment shown here, a total of three digit rollers 11, 12, 13 are provided. The digit roller counter 10 is arranged in a hollow-cylindrical longitudinal section 14 of the handle 2 . The wall 15 of the longitudinal section 14 is broken through by a viewing window 16 . A section of the roller counter 10 and the set torque can be seen through the viewing window 16 .

The roller counter 10 has a passage 17 in its central axis ML. A shaft section 18 is guided through the passage 17 . The shaft section 18 is part of an adjusting shaft 19, which is part of an adjusting arrangement, via which a comparison between the setting value of a torque displayed by the roller counter 10 and the triggering torque can be carried out.

The digit roller counter 10 and the components of the digit roller counter 10 belonging to the display 3 individually and in various configurations can be seen in particular in FIGS. 13 and 15 to 21.

A number roll 11, 12, 13 has an outer cylindrical number ring 20 provided with numbers. The number ring 20 includes a first ring section 21 a drive toothing 22 and a second rim portion 23 with a switching element 24 on. The drive toothing 22 is arranged circumferentially on the inner circumference of the first ring section 21 . The switching element 24 is formed by a single internally toothed toothed segment. On the side 25 of a digit roller 11, 12, 13 on which the switching element 24 lies, i.e. on the switching element side, each digit roller 11, 12, 13 has an annular collar 26 which has a recess 27 in the area of the switching element 24.

Each number roller 11, 12, 13 has a hub 28 and a disk body 29 arranged between the hub 28 and the outer number ring 20. Between two digit rollers 11, 12 and 12, 13, respectively, a carrier disk 30 held non-rotatably in the handle 2 is incorporated. The carrier disk 30 has a radial projection 31 which engages in a recess 32 in the handle 2 . A carrier disk 30 is supported in the handle 2 by the projection 31 projecting into the recess 32 and is held in a rotationally fixed manner.

A ratchet wheel 33 is rotatably associated with each carrier disk 30 . The ratchet wheel 33 is mounted on a shaft journal 34 which is arranged eccentrically on the carrier disk 30 . The carrier disk 30 has a pot-shaped central piece 35 with a radial disk section 36. The ratchet wheel 33 is arranged in a receptacle 37, which is arranged in the area of the outer circumference of the central piece 35. The disc section 36 has an opening 38 in the area of the receptacle 37 .

The ratchet wheel 33 has a drive toothing 39 and a switching toothing 40 . The switching toothing 40 adjoins the driving toothing 39 on the face side. The driving toothing 39 has a number of driving teeth 41. The switching toothing 40 has a number of switching teeth 42. The number of drive teeth 41 is twice as large as the number of ratchet teeth 42. In the example shown there are a total of three ratchet teeth 42 which are arranged on a pitch circle at an angle of 120° to one another. In each case one shifting tooth 42 is oriented congruently with a driving tooth 41 . The ratchet wheel 33 sits in the receptacle 37 on the shaft journal 34. The drive toothing 39 lies in some areas in the opening 38, so that the drive toothing 39 protrudes on both sides with respect to the disc section 36.

The roller counter 10 is introduced as a unit from the opening 43 on the actuating body side into the handle 2 and is positioned in the hollow-cylindrical longitudinal section 14 . The shaft section 18 is guided through the passage 17 . The projections 31 of the carrier discs 30 engage in the recesses 32 on the inner circumference of the longitudinal section 14 in a counter-acting manner.

The adjusting body 7 has a socket 44 . Drivers 45 are arranged on the end face of the connecting piece 44 . The drivers 45 are tooth-like in design and are arranged on an annular web 46 of the socket 44 so as to protrude outwards. Two drivers 45 are provided on the circumference at a small distance from one another and form a driver pair. On the circumference of the annular web 46 are two driver pairs formed by two drivers 45 diametrically opposite.

The drivers 45 of the adjusting body 7 are in engagement with the drive toothing 22 of the first digit roller 11 on the adjusting body side.

Between the first digit roller 11 and the second digit roller 12 and between the second digit roller 12 and the third digit roller 13, a carrier disk 30 is arranged in a rotationally fixed manner. The first carrier disk 30 between the first digit wheel 11 and the second digit wheel 12 has the task of transmitting a rotational movement between the first digit wheel 11 and the second digit wheel 12 . After a complete rotation of the first digit wheel 11, the second digit wheel 12 is rotated further by one digit or by one position. After the second digit roller 12 has performed a complete revolution, the following third digit roller 13 is moved on by one digit or one position.

As can be seen in FIG. 18, the shift toothing 40 is overlapped by the annular collar 26 . Two adjacent ratchet teeth 42 at an angle of 120° to one another are located on the inside of the collar 26 . The collar 26 slides over the two ratchet teeth 42. The ratchet wheel 33 stands still in this position until a digit roller 11, 12, 13 with the switching element 24 and the recess 27 moves over a ratchet tooth 40. The ratchet wheel 33 is released in this position and is rotated further by one position or one digit.

Since the ratchet wheel 33 engages with the drive toothing 39 in the drive toothing 22 of the subsequent second digit roller 12, the digit roller 12 is held in place by the ratchet wheel 33 while the first digit roller 11 is rotated. After a complete rotation of the first digit roller 11, the ratchet wheel 33 comes into engagement with the ratchet toothing 40 or a ratchet tooth 42 and the switching element 24. The ratchet wheel 33 is rotated further by one position and the digit roller 12 is adjusted by one digit. The ratchet teeth 42 are then again covered by the collar 26. The ratchet wheel 33 and the digit roller 12 are fixed in position or held stationary until the switching element 24, after another complete revolution, comes into engagement again with a ratchet tooth 42 and the ratchet wheel 33 and the digit roller 12 rotated one more position. In the same way, the third digit roller 13 is then rotated by one additional digit or position.

References:

1 - torque screwdriver 2 - handle

3 - display

4 - downforce

5 - adjustment device

6 - compression spring

7 - actuator

8 - latch

9 - locking body 10 - digit roller counter 11 - digit roller

12 - digit roll

13 - digit roll

14 - length section

15 - wall

16 - viewing window 17 - passage

18 - shaft section

19 - adjustment shaft

20 - number ring

21 - first wreath section

22 - drive teeth

23 - second wreath section

24 - switching element 25 - page of 11, 12, 13

26 - fret

27 - recess 28 - hub

29 - disk body

30 - carrier disk

31 - protrusion 32 - recess

33 - ratchet wheel

34 - shaft journal

35 - center piece

36 - disc section

37 - recording

38 - opening

39 - drive teeth

40 - shift teeth

41 - drive tooth

42 - shift tooth

43 - opening

44 - sock

45 - carrier

46 - ring land

L - longitudinal axis ML - central axis

Claims

Expectations

1. Torque tool, in particular a torque screwdriver (1), with a handle (2) and an adjusting body (7) that can be rotated about the longitudinal axis (L) of the handle (2) for setting a torque and a display (3) for a set torque , which comprises a digit roller counter (10), the digit roller counter (10) having at least two digit rollers (11, 12, 13), characterized in that the

Roller counter (10) is arranged in a hollow-cylindrical longitudinal section (14) of the handle (2), which has a viewing window (16) through which the set torque can be seen and the roller counter (10) has a passage (17 ) through which a shaft section (18) is guided, with a carrier disc (30) arranged non-rotatably in the handle (2) being integrated between two digit rollers (11, 12 or 12, 13) and the carrier disc (30) having a ratchet wheel ( 33) which has a drive toothing (39) and a switching toothing (40) and wherein a digit roller (11, 12, 13) has an outer number ring (20) which has a first ring section (21) with a drive toothing (22 ) and a second ring section (23) with a switching element (24) and wherein the adjusting body (7) has means for transmitting a rotational movement of the adjusting body (7) to the digit roller ( 11) has.

2. Torque tool according to claim 1, characterized in that the carrier disc (30) has a radial projection (31) which projects into a recess (32) in the handle (2).

3. Torque tool according to claim 1 or 2, characterized in that the adjusting body (7) has a connecting piece (44) with drivers (45) which are in engagement with the drive teeth (22) of the adjusting-body-side digit roller (11).

4. Torque tool according to one of claims 1 to 3, characterized in that the shaft portion (18) is part of an adjusting shaft (19) which is part of an adjusting arrangement, via which a comparison can be carried out between the setting value of a torque displayed by the roller counter (10) and the triggering torque.

5. Torque tool according to one of Claims 1 to 4, characterized in that each digit roller (11, 12, 13) has a hub (28) and a disc body (29) arranged between the hub (28) and the digit ring (20).

6. Torque tool according to one of Claims 1 to 5, characterized in that the ratchet wheel (33) is mounted on a shaft journal (34) which is arranged eccentrically on the carrier disc (30).

7. Torque tool according to one of Claims 1 to 6, characterized in that the carrier disc (30) has a pot-shaped central piece (35) with a radial disc section (36), the ratchet wheel (33) being arranged in a receptacle (37). , which is arranged in the area of the outer circumference of the center piece (35) and the disc section (36) in the area of the receptacle (37) has an opening (38).

8. Torque tool according to one of claims 1 to 7, characterized in that the switching toothing (40) adjoins the driving toothing (39) on the front side, the driving toothing (39) having a number of driving teeth (41) and the switching toothing (40) having a number of ratchet teeth (42), the number of driving teeth (41) being twice as large as the number of ratchet teeth (42), the ratchet teeth (42) being arranged at an angle to one another on a pitch circle and each ratchet tooth (42) is oriented congruently with a drive tooth (41).

9. Torque tool according to one of claims 1 to 8, characterized in that a digit roller (11) on the switching element side has an annular collar (26) which has a recess (27) in the region of the switching element (24).