Fastening device for fastening a reaction force transmission element to a housing of a screwing device, and screwing device

Abstract

The invention relates to a fastening device (10) for fastening a reaction force transmission element (104) to a housing (102) of a screwing device (100), the screwing device (100) having a housing portion (108) that extends in an axial direction and has a housing profile and an at least partially circumferential groove (112), having a retaining device (12) and having a locking ring (14), the retaining device (12) having a retaining ring (12a) with a retaining ring hole (12b), the holding ring hole (12b) having an inner profile adapted to the housing profile of the housing section (108), the locking ring (14) having a locking ring hole (14a) with an inner profile adapted to the housing profile of the housing section (108) and a thickness adapted to the groove (112), wherein the retaining ring (12) and the locking ring (14) are arranged coaxially with respect to one another and are held in the axial direction with respect to one another, wherein, in a basic position, the retaining ring hole (12a) and the locking ring hole (14a) at least partially overlap, wherein the locking ring (14) is arranged rotatably with respect to the retaining ring (12) about a central axis (M) common to the retaining ring (12), and in the state arranged on the housing section (108), the locking ring (14) can be rotated from the basic position with respect to the retaining ring (12) into a locking position in which the locking ring (14) engages with at least one locking section in the groove (112), wherein the retaining device (10) has a fastening section to which the reaction force transmission element (104) can be fastened.

Description

[0001] Fastening device for attaching a reaction force transmission element to a housing of a screwdriving device, as well as screwdriving device

[0002] The present invention relates to a fastening device for fastening a reaction force transmission element to a housing of a screwdriving device, and to a screwdriving device.

[0003] Screwdriving tools, such as screwdrivers or rotary screwdrivers, are used to tighten or loosen screws. Various types of screwdriving tools exist, driven, for example, pneumatically, hydraulically, or electrically. To absorb the reaction torque transmitted to the tool's housing during tightening or loosening, reaction force transmission elements, such as reaction arms, are used. There are also variants where this absorption is achieved via a reaction force transmission element attached to a specially shaped washer on the screw being tightened.

[0004] A reaction arm can, for example, be positively connected to the housing of the screwdriving tool and, during operation, is supported by the area surrounding the screw being worked. The known screwdriving tools can, for example, have a housing surrounding the output shaft, which has a housing profile with a splined shaft shape onto which the reaction arm is pushed with a correspondingly adapted ring. To secure the reaction arm against axial movement, a circumferential groove is provided in the housing profile, into which a retaining ring is inserted. The retaining ring can only be fastened or loosened with a tool. Therefore, relatively complex steps are necessary for fastening or removing the reaction arm. An example of a known screwdriving tool is the rotary screwdriver "DA2power," sold under the brand name "Plarad".From DE 203 01 759 Ul, it is known to fasten a reaction force transmission element to the screw device by means of a retaining ring and a locking device with a pawl engaging in a groove. To remove the reaction force transmission element, the retaining ring must again be released with a tool.

[0005] The object of the present invention is to provide a fastening device for attaching a reaction force transmission element to a screwdriving tool, thereby simplifying the handling of the reaction force transmission element. It is further an object of the present invention to provide a screwdriving tool with such a fastening device for the reaction force transmission element, in which simplified handling of the reaction force transmission element is possible.

[0006] The fastening device according to the invention is defined by the features of claim 1.

[0007] The screwing device according to the invention is defined by the features of claim 14.

[0008] The fastening device according to the invention for attaching a reaction force transmission element to the housing of a screwdriving device, wherein the screwdriving device has an axially extending housing section with a housing profile and with a groove or recess that at least partially circumferentially, comprises a retaining device and a locking ring. The retaining device has a retaining ring with a retaining ring hole, the retaining ring hole having an inner profile adapted to the housing profile of the housing section. The locking ring has a locking ring hole with an inner profile adapted to the housing profile of the housing section and a thickness adapted to the groove or recess. The retaining ring and the locking ring are arranged coaxially to each other and held or fixed axially to each other, wherein in a basic position the retaining ring hole and the locking ring hole at least partially overlap.The locking ring is rotatably arranged relative to the retaining ring about a central axis common to the retaining ring. In the state installed on the housing section, the locking ring can be rotated from its basic position relative to the retaining ring into a locking position in which at least one locking section of the locking ring engages in the groove. The retaining device also has a mounting section to which the reaction force transmission element can be attached.

[0009] The locking ring has a thickness (extent in axial direction) that is smaller than the width of the groove or recess (extent in axial direction), thus enabling engagement.

[0010] The fastening device according to the invention allows for the simple attachment of a reaction force transmission element to the housing of a screwdriving tool. By adapting the retaining ring and the locking ring to the housing profile of the screwdriving tool's housing section, the retaining ring and locking ring can be easily slid onto the housing profile in the axial direction of the housing section. Once the locking ring is positioned in the area of ​​the groove in the housing section, it can be rotated relative to the retaining ring, which remains in position due to the adaptation of the retaining ring hole to the housing profile in the direction of rotation. The groove allows the locking ring to be rotated so that its locking section engages in the groove.This results in an overlap between the locking section and at least part of the housing profile in the axial direction of the housing section, thus preventing axial movement of the fastening device through the interaction of the locking ring and the housing profile. The fastening section of the holding device allows the reaction force transmission element to be attached to the fastening device, so that the reaction force transmission element can be attached to the screwdriving device via the fastening device. The fastening device thus forms a kind of adapter between the reaction force transmission element and the screwdriving device. Furthermore, the fastening device according to the invention enables particularly easy handling.For example, a reaction force transmission element attached to the mounting device can be easily attached to and removed from the screwdriving tool together with the mounting device. Due to the coaxial arrangement of the retaining ring and locking ring, which are held or fixed axially relative to each other, the locking ring can advantageously be rotated relative to the retaining ring from its home position into the locking position and back to its home position for removal. Furthermore, the mounting device according to the invention offers the particular advantage that the mounting device can be attached to the housing section of the screwdriving tool without tools, since it is only necessary to slide the mounting device onto the housing section and rotate the locking ring to achieve the locking position. This allows for particularly easy handling.

[0011] In order to enable the fastening device to be positively attached to the housing section, the housing section has a housing profile with a cross-section having a changing radius. This housing profile, which deviates from a circular shape, is used by the fastening device according to the invention to, on the one hand, position the retaining ring rotationally fixed on the housing section and, on the other hand, to enable an axial overlap between the retaining ring and the housing profile in the locking position of the retaining ring, by means of a groove that provides an engagement point for the locking section of the retaining ring in the housing profile.

[0012] Preferably, the locking ring hole and the retaining ring hole are congruent in the basic position. In principle, the inner profile of the locking ring hole and the inner profile of the retaining ring hole can differ, provided that in the basic position the fastening device can be slid axially onto the housing profile of the housing section of the screw device. However, designing the locking ring hole and the retaining ring hole to be congruent offers the advantage that they can be manufactured easily and, moreover, the basic position of the locking ring is easily identifiable, since the locking ring hole and the retaining ring hole are perfectly aligned in this position. Within the scope of the invention, congruent shape means that the shape of the locking ring hole and the retaining ring hole are nearly identical.For example, if the housing profile has an involute profile shape with a multitude of involute profiles, the same number of appropriately adapted projections can be arranged at the locking ring hole and retaining ring hole, which lie on top of each other in the basic position, but do not necessarily have to have the exact same length.

[0013] It can be provided that the inner profile of the locking ring hole and the inner profile of the retaining ring hole have a shape inverse to that of the housing profile. This has the advantage that the retaining ring can be easily slid onto the housing section, since it is easy to see how the retaining ring must be positioned relative to the housing profile to allow it to be slid onto the housing section.

[0014] In a preferred embodiment of the invention, the locking ring can be fixed, preferably locked, in the locked position and / or in the home position relative to the retaining ring. This ensures that the locking ring remains in the locked position and is not unintentionally rotated into the home position. The fixing can be achieved, for example, by friction locking or positive locking.

[0015] Preferably, the fastening device according to the invention has an actuating device, wherein the locking ring is connected to the actuating device and can be rotated relative to the retaining ring by means of the actuating device. Rotating the locking ring is simplified by the actuating device, as it can be easily rotated by means of the actuating device. For example, the actuating device can be easily gripped and rotated, whereby the locking ring is also rotated.

[0016] The locking ring can, for example, be connected to the actuating device in an axial direction.

[0017] The actuating device can be sleeve-shaped and mounted on a bearing section of the holding device, rotatably supported, with the holding device being arranged coaxially to the retaining ring. This design provides a particularly advantageous form of actuating device, as it is both stably supported and can be conveniently operated from the outside. The bearing section can, for example, be formed by the retaining ring.

[0018] Preferably, the actuating device and the locking ring are connected by one or more axially extending bolts, the bolt being guided in an elongated hole formed in the holding device, or the bolts each being guided in an elongated hole formed in the holding device. The elongated hole can form a stop for the home position and the locking position, respectively, or the elongated holes can form corresponding stops, so that the locking ring can be actuated in a simple manner. For example, the stop in the locking position can prevent the locking ring from being rotated too far and accidentally reaching a position in which it no longer locks sufficiently.

[0019] In a preferred embodiment of the invention, the locking ring is mounted in a positioning ring which is received in the holding device. The positioning ring can form a stop projection, the stop projection having an axial distance A to the locking ring which is adapted to a distance B in the axial direction between a stop surface of the housing section and the groove on the housing section.

[0020] The stop projection on the positioning ring thus allows the fastening device to be positioned advantageously, since when the fastening device is slid onto the housing section, the stop projection can abut the stop surface of the housing section, thereby advantageously aligning the locking ring with the groove to allow it to be rotated into the locking position. The stop projection on the positioning ring thus facilitates the simple handling of the retaining ring according to the invention.

[0021] The invention can further provide that, to lock the locking ring in the locked position, a locking element arranged on the retaining ring engages in a locking recess in the locking ring. By means of the locking element, a positive locking fixation of the locking ring in the locked position is possible in a simple manner. In principle, a locking mechanism could also be arranged acting between the retaining ring and the actuating device.

[0022] Preferably, the fastening section has a fastening profile adapted for positive engagement with an element fastening profile of the reaction force transmission element. Torques are advantageously transmitted between the fastening device and the reaction force transmission element via this positive engagement, thereby enabling advantageous support by means of the reaction force transmission element.

[0023] The mounting section can be sleeve-shaped, with the mounting profile arranged on an inner wall of the mounting section. The reaction force transmission element can thus be designed to be inserted into the mounting section. Alternatively, the mounting profile could also be arranged on an outer wall of the mounting section, in which case it would have an inwardly directed mounting profile.

[0024] The mounting section may also include receptacles for fasteners to attach the reaction force transmission element. For example, the reaction force transmission element may be fastened using screws, and the mounting section may, for instance, have holes for the screws.

[0025] The fastening section can be formed by a first end section of the holding device in the axial direction, and the bearing section can be formed by a second end section of the holding device in the axial direction.

[0026] The invention further relates to a screwdriving device comprising a housing, an axially extending housing section with a housing profile, a socket wrench, a reaction force transmission element, and a fastening device according to the invention, wherein the fastening device is positively connected to the housing section and engages in the at least partially circumferential groove, and wherein the reaction force transmission element is attached to the fastening device. The fastening device thus forms a type of adapter for attaching the reaction force transmission element to the housing section, wherein the reaction force transmission element, together with the fastening device and preferably also together with the socket wrench, can be removed from the housing section without tools. This makes handling the reaction force transmission element particularly easy.

[0027] In the screw device according to the invention, the housing section can be, for example, a part of the housing surrounding the output shaft, such that the axial direction of the housing section corresponds to the axial direction of the output shaft.

[0028] Preferably, the reaction force transmission element is designed in a sleeve shape and surrounds the socket wrench, wherein the reaction force transmission element has an element mounting profile at an axial first end of the reaction force transmission element which is adapted to the mounting profile of the mounting section of the holding device.

[0029] Preferably, the reaction force transmission element has a reaction force transmission profile at an axial second end of the reaction force transmission element, which is adapted to a profile of a washer of a screw to be loosened.

[0030] The invention will be explained in more detail below with reference to the following figures. These show:

[0031] Fig. 1 shows a schematic sectional view of a part of a screw device according to the invention with a fastening device according to the invention.

[0032] Fig. 2 shows a schematic sectional view of the fastening device according to the invention.

[0033] Figure 1 schematically depicts a part of a screwdriving device 100 according to the invention. The screwdriving device 100 comprises a housing 102, a sleeve-shaped reaction force transmission element 104, and an output shaft 106. The output shaft serves for connection with a socket wrench 107. The housing 102 has a housing section 108 that extends in the axial direction of the output shaft 106. The housing section 108 has a housing profile with a changing radius in cross-section. In the embodiments shown in the figures, the housing profile has the form of a splined shaft or an involute profile shaft.

[0034] The screw device 100 according to the invention further comprises a fastening device 10 according to the invention for fastening the reaction force transmission element 104 to the housing 102. The fastening device 10 can be fastened to the housing 102 at a first side in the axial direction. The reaction force transmission element 104 is fastened to a second side in the axial direction.

[0035] The fastening device 10 has a holding device 12 by means of which the fastening device 10 can be positively connected to the housing section 108.

[0036] For this purpose, the retaining device 12 has a retaining ring 12a with a retaining ring hole 12b which has an inner profile inverse to the housing profile of the housing section 108, so that the retaining device 12 can engage with the housing profile of the housing section 108.

[0037] To secure the fastening device 10 in the position placed on the housing section 108, the fastening device 10, as can also be seen in Fig. 2, has a locking ring 14 which secures the fastening device 10 against loosening in the axial direction. The locking ring 14 engages in a groove 112 that is at least partially circumferential and is provided in the housing profile of the housing section 108.

[0038] In the embodiments shown in the figures, where the housing profile is formed in the form of an involute profile shaft with a plurality of radially projecting involute profiles, the groove 112 is only provided in the projecting involute profiles. As can be seen from the figures, the retaining device 12 is sleeve-shaped. An axially extending end section 12c forms a mounting section for securing the reaction force transmission element 104. The retaining ring 12a is arranged in an axially extending end section 12d of the retaining device 12, wherein a bearing section for a sleeve-shaped actuating device 16, which is mounted on the bearing section, is formed on the outside of the retaining ring 12.

[0039] The locking ring 14 is arranged in the retaining device 12 and is mounted in a positioning ring 17. The locking ring 14 is connected to the actuating device 16. Similar to the retaining ring 12 with its retaining ring hole 12a, the locking ring 14 has a locking ring hole 14a, the inner profile of which is also adapted to the housing profile of the housing section 108. Furthermore, the locking ring 14 has a thickness that is adapted to the width of the groove 112 in the axial direction. The thickness of the locking ring 14 is its axial extent. The retaining ring 12, the locking ring 14, and the actuating device 16 are arranged coaxially with each other. The locking ring 14 and the actuating device 16 are connected by means of several axially extending bolts 19.

[0040] In a basic position, the retaining ring hole 12a and the locking ring hole 14a overlap, and the fastening device 10 can be slid onto the housing profile of the housing section 108, with the inner profiles of the retaining ring hole 12a and the locking ring hole 14a engaging in the housing profile. The locking ring 14 can be rotated relative to the retaining ring 12 via the actuating device 16. When the locking ring 14 is located in the area of ​​the groove 112 during the sliding of the retaining ring 10 onto the housing section 108, the locking ring 14 can be rotated relative to the retaining ring 12 by means of the actuating device 16, whereby the locking ring 14 then engages with a locking section in the groove 112. In the axial direction, the locking section of the locking ring 14 covers parts of the housing profile of the housing section 108, so that the fastening device 10 is fixed in the axial direction by means of the locking ring 14.Due to the design of the housing profile of the housing section 108 in the form of an involute profile shaft, the inner profile of the locking ring 14, which is designed inversely to the housing profile, has inwardly projecting projections 14b that engage in the longitudinal grooves 108a formed between the projecting involute profiles when the locking ring 14 is pushed onto the housing section 108. These projections 14b each form a locking section that engages in the groove 112 in the keys when the locking ring 14 is in the locked position.

[0041] The bolts 19 are each guided in an elongated hole 21 formed in the holding device 12. The elongated holes 21 each form a stop for the basic position and the locked position.

[0042] The positioning ring 17 has a stop projection 18 that protrudes into the retaining ring hole 12b. The retaining device 12 can abut a stop surface 108b of the housing section 108 by means of the stop projection 18. The stop projection 18 has a distance A in the axial direction from the locking ring 14, which corresponds to the distance B in the axial direction between the stop surface 108b and the groove 112. In this way, when the retaining ring 10 is placed on the housing section 108, the locking ring 14 can be easily positioned relative to the groove 112, so that the locking ring 14 can be easily rotated from its initial position to the locked position.

[0043] In the locked position, the retaining ring 12 and the locking ring 14 can be locked relative to each other. For this purpose, a locking element (not shown) is arranged on the retaining ring 12a, which engages in a locking recess in the locking ring 14.

[0044] The fastening section has a fastening profile 20 into which an element fastening profile 104a of the reaction force transmission element 104 engages in a form-fitting manner. The fastening section is designed in a sleeve-like shape, with the fastening profile 20 arranged on an inner wall of the fastening section. The element fastening profile 104a is arranged accordingly on the outside of the reaction force transmission element 104. As can best be seen from Fig. 2, the fastening section also has receptacles 22 for fastening means 24, by means of which the reaction force transmission element 104 can be connected to the holding device 12. For example, the fastening means 24 are screws by means of which the reaction force transmission element 104 can be screwed to the holding device 12.

[0045] The reaction force transmission element 104 is sleeve-shaped. The element mounting profile 104a is arranged at an axial first end 104b. A reaction force transmission profile 104d is formed at an axial second end 104c of the reaction force transmission element 104; this profile is adapted to a washer 200 of a screw 210 to be loosened. The reaction force transmission element 104 surrounds the socket wrench 107.

[0046] The fastening device 10 advantageously enables the reaction force transmission element 104 and the socket wrench 107 to be connected to the screwdriving device 100 together without tools. This allows for particularly easy handling.

[0047] List of components Fastening device Holding device a Retaining ring b Retaining ring hole c First end section d Second end section Locking ring a Locking ring hole, b Projections Actuating device Positioning ring Stop projection Bolt Mounting profile Slotted hole Mounting elements Fasteners 0 Screw device 2 Housing 4 Reaction force transmission element 4a Element mounting profile 4b First end 4c Second end 4d Reaction force transmission profile 6 Output shaft 7 Socket wrench 8 Housing section 8a Longitudinal grooves 8b Stop surface 2 Groove 0 Washer 0 Screw A Spacing

[0048] B distance

[0049] M Central axis

Claims

Patent claims 1. Fastening device (10) for fastening a reaction force transmission element (104) to a housing (102) of a screwdriving device (100), wherein the screwdriving device (100) has an axially extending housing section (108) with a housing profile and with a groove (112) that is at least partially circumferential, with a retaining device (12) and with a locking ring (14), wherein the retaining device (12) has a retaining ring (12a) with a retaining ring hole (12b), wherein the retaining ring hole (12b) has an inner profile adapted to the housing profile of the housing section (108), wherein the locking ring (14) has a locking ring hole (14a) with an inner profile adapted to the housing profile of the housing section (108) and a thickness adapted to the groove (112), wherein the retaining ring (12) and the locking ring (14) are arranged coaxially to each other and are held axially to each other.wherein in a basic position the retaining ring hole (12a) and the locking ring hole (14a) at least partially overlap, characterized in that the locking ring (14) is rotatably arranged about a central axis (M) common with the retaining ring (12) relative to the retaining ring (12) and, in the state arranged on the housing section (108), the locking ring (14) is rotatable from the basic position relative to the retaining ring (12) into a locking position in which the locking ring (14) engages in the groove (112) at least with a locking section, wherein the retaining device (10) has a fastening section to which the reaction force transmission element (104) can be fastened.

2. Fastening device according to claim 1, characterized in that the locking ring hole (14a) of the locking ring (14) and the retaining ring hole (12a) of the retaining ring (12) are identical.

3. Fastening device according to claim 2, characterized in that the inner profile of the locking ring hole (14a) of the locking ring (14) and the inner profile of the retaining ring hole (12a) of the retaining ring (12) have a shape inverse to the housing profile.

4. Fastening device according to one of claims 1 to 3, characterized in that the locking ring (14) can be fixed, preferably locked, in the locking position and / or in the basic position relative to the retaining ring (12).

5. Fastening device according to one of claims 1 to 4, characterized by an actuating device (16) which is arranged on the holding device, wherein the locking ring (14) is connected to the actuating device (16) and is rotatable relative to the retaining ring (12) by means of the actuating device (16).

6. Fastening device according to claim 5, characterized in that the locking ring is connected to the actuating device (16) in an axial direction.

7. Fastening device according to claim 5 or 6, characterized in that the actuating device (16) is designed in a sleeve shape and is mounted on a bearing section of the holding device and rotatably mounted, wherein the holding device is arranged coaxially to the retaining ring (12).

8. Fastening device according to one of claims 5 to 7, characterized in that the actuating device (16) and the locking ring are connected via one or more bolts (19) extending in an axial direction, wherein the bolt is guided in an elongated hole formed in the holding device or the bolts are each guided in an elongated hole (21) formed in the holding device.

9. Fastening device according to one of the preceding claims, characterized in that, for locking the locking ring (14) in the locking position, a locking element arranged on the retaining ring (12a) engages in a locking recess in the locking ring (14).

10. Fastening device according to one of the preceding claims, characterized in that the fastening section has a fastening profile (20) which is adapted for positive engagement with an element fastening profile (104a) of the reaction force transmission element (104).

11. Fastening device according to claim 10, characterized in that the fastening section is designed in a sleeve shape, wherein the fastening profile is arranged on an inner wall of the fastening section.

12. Fastening device according to one of the preceding claims, characterized in that the fastening section has receptacles (22) for fastening means (24) for fastening the reaction force transmission element.

13. Fastening device according to one of the preceding claims, characterized in that the fastening section is formed by an axially first end section (12c) of the holding device. - 17 - and the bearing section is formed by a second end section (12d) of the holding device in the axial direction.

14. Screwing device (100) with a housing (102) with a housing section (108) extending in an axial direction and having a housing profile, with a socket wrench, with a reaction force transmission element and with a fastening device according to one of claims 1 to 13, wherein the fastening device is positively connected to the housing section and the fastening device (10) engages in the at least partially circumferential groove (112).

15. Screwing device according to claim 14, characterized in that the reaction force transmission element is sleeve-shaped and surrounds the socket wrench (107), wherein the reaction force transmission element has an element fastening profile at an axial first end of the reaction force transmission element which is adapted to the fastening profile of the fastening section of the holding device.

16. Screwing device according to claim 15, characterized in that the reaction force transmission element has a reaction force transmission profile at an axial second end of the reaction force transmission element which is adapted to a profile of a washer (200) of a screw (210) to be loosened.

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