Slugging wrench

Abstract

The present invention relates to a slugging wrench for exerting slugging force on a fastening member such as a nut during tightening or loosening thereof, the slugging wrench comprising: an arm, an impact absorbing element arranged on the arm for absorbing the slugging force, a receiving member for receiving the fastening member, wherein the receiving member is provided with an inner surface fitting in force-transmitting manner on an outer surface of the fastening member and preferably having in a view, such as in the in-feed direction, a shape such as a polygon, such as a hexagon, such as a dodecagon, wherein the inner surface is provided with two grooves suitable for receiving a clamping member for the purpose of providing a clamping action in respect of the fastening member.

Claims

1. A slugging wrench configured for exerting a slugging force on a fastening member during tightening or loosening thereof when hit with a hammer, the slugging wrench comprising: an arm; a receiving member integrated into an end of the arm, comprising a hole along an in-feed direction of the fastening member and configured for receiving the fastening member, the receiving member having an inner surface completely surrounding the hole radially and configured to fit, in force-transmitting manner, on an outer surface of the fastening member, and, comprising at least two wall parts having in a view, in the in-feed direction, a polygonal shape; and at least first and second clamping rings configured for providing a clamping action on the fastening member to retain the slugging wrench in position on the fastening member without being hand-held when located within the receiving member, wherein the inner surface of the receiving member is provided with at least two radial grooves respectively configured for receiving one of the first and second clamping rings, wherein the inner surface of the receiving member is configured to have a first nut engaging surface at a central part thereof, with situated, on the upper side and underside thereof in the in-feed direction, second and third nut engaging surfaces with the two radial grooves arranged therebetween in the in-feed direction in such a way that, along the in-feed direction, the slugging wrench has, in this order, the second nut engaging surface, the first clamping ring, the first nut engaging surface, the second clamping ring, and the third nut engaging surface, and wherein a rear wall of the radial grooves comprises bulges for pressing the clamping rings against the fastening member.

2. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings corresponds to one of the at least two grooves, and wherein each clamping ring is circular, or wherein each clamping ring is polygonal so as to match the shape of the inner surface.

3. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings provide a clamping force to the vertices of the fastening member which define a circumscribed circle or to flat parts of the fastening member.

4. The slugging wrench as claimed in claim 1, wherein the first and second clamping rings are made of a resilient metal providing a spring force when pressed on the bulges.

5. The slugging wrench as claimed in claim 1, wherein the inner surface is dimensioned relative to standard sizes of fastening members in order to provide a predetermined clearance between the outer surface of the fastening member and the inner surface of the slugging wrench, wherein the depth of the radial grooves is smaller than the difference between outer and inner radii of the first and second clamping rings.

6. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings is an open ring or retaining ring.

7. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings defines a clamping plane which has a cylindrical shape with some height and which extends over at least 80% of the periphery of a cylinder.

8. The slugging wrench as claimed in claim 1, wherein an inner diameter of each of the first and second clamping rings in non-tensioned state is smaller than a circumscribed circle of the fastening member intended for the slugging wrench.

9. The slugging wrench as claimed in claim 1, comprising a stop for positioning each of the first and second clamping rings in a rotational direction which is arranged in one of the respective radial grooves.

10. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings has a star shape on the inner side thereof, in the form of a wire-like ring with bends.

11. The slugging wrench as claimed in claim 1, wherein bulges for engaging on the fastening member are arranged on the inner side of each of the first and second clamping rings.

12. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings is embodied as a flat retaining ring.

13. The slugging wrench as claimed in claim 1, wherein each of the first and second clamping rings comprises pressing bulges for pressing against the outer wall of the groove.

14. The slugging wrench as claimed in claim 1, wherein the receiving member comprises at least one opening for providing a lateral passage for the fastening member.

15. The slugging wrench as claimed in claim 1, wherein the at least two wall parts have in a view, in the in-feed direction, a hexagonal shape.

16. The slugging wrench as claimed in claim 1, wherein the at least two wall parts have in a view, in the in-feed direction, a dodecagonal shape.

17. The slugging wrench as claimed in claim 4, wherein the resilient metal is steel.

18. The slugging wrench as claimed in claim 4, wherein the resilient metal is spring steel.

19. The slugging wrench as claimed in claim 5, wherein the depth of the radial grooves is less than 0.9 times the difference between the outer and inner radii of the first and second clamping rings.

20. The slugging wrench as claimed in claim 8, wherein the inner diameter of each clamping ring in the non-tensioned state is smaller than an inscribed circle of the inner surface.

21. The slugging wrench as claimed in claim 1, wherein the bulges are distributed long an inner surface of the at least two radial grooves.

22. The slugging wrench as claimed in claim 1, wherein the at least two radial grooves are circular.

23. The slugging wrench as claimed in claim 1, wherein the first and second clamping rings are circular.

Description

(1) Further advantages, features and details of the present invention will be described in greater detail herein-below on the basis of one or more preferred embodiments with reference to the accompanying figures. Similar, though not necessarily identical, components of different preferred embodiments are designated with the same reference numerals.

(2) FIG. 1 is a perspective view of a first preferred embodiment according to the present invention.

(3) FIG. 2 is a schematic top view of a further preferred embodiment.

(4) FIG. 3 shows two further preferred embodiments in cross-section.

(5) FIG. 4 shows a cross-sectional detail of the embodiment according to FIG. 1.

(6) FIG. 5 shows a cross-sectional detail of a further preferred embodiment.

(7) FIG. 6 shows a detail of a further preferred embodiment.

(8) FIG. 7 shows a perspective, front and side view of a detail of the embodiment according to FIG. 6.

(9) A first preferred embodiment (FIG. 1) according to the present invention relates to a slugging wrench 1 having an arm 9 and a receiving member 17. This comprises clamping rings (clamping members) 7, 8 arranged in a groove 6 on the inner side of ring 2 of the slugging wrench. Although the ring can be a hexagon, the present ring is a dodecagon. A central part of ring 2 of the slugging wrench is formed by nut engaging surfaces 3, and situated on the upper side are nut engaging surfaces 5 and on the underside nut engaging surfaces 5. Arranged therebetween are two grooves 12 which can for instance be formed by a milling operation. The dual embodiment of grooves 12 and the clamping rings 7, 8 arranged therein provides a relatively high clamping force relative to the nut (not shown).

(10) FIG. 2 shows that clamping rings 7, 8 are substantially circular with a recess with an opening, whereby they can be bent so far inward that they can be placed in a groove after the groove has been arranged in the ring of the slugging wrench.

(11) FIG. 3 shows cross-sections of two variants of ring 7, 8. Ring 7 is manufactured from a substantially wire-like material of for instance spring steel. The rounding of the wire-like material makes it possible for the nut to be pressed through the ring, wherein the ring is forced outward. Ring 8 is a variant in flat steel material. For the purpose of obtaining the same action as ring 7, it is provided on the inner side with a curvature or chamfering so that the ring is pressed outward during placing of the slugging wrench on a nut.

(12) FIG. 4 shows a cross-section of ring 2 of the slugging wrench according to FIG. 1 along the line IVIV. In this preferred embodiment the depth (D1) of the groove is no deeper than the cross-section of the ring or the thickness of the ring as seen in top view, at least at the locations of the ring wrench where the vertices of the nuts can be placed. This achieves that the ring can provide a clamping action between rear wall 19 of the groove and the nut.

(13) FIG. 5 shows a further variant wherein the rear wall 14 of the groove is provided with protrusions or bulges 13 for the purpose of providing a stop for the outer side of the ring 7 there-against. The positioning of these bulges 13 is such that it corresponds substantially to the centre of the surfaces 17 of the nut. A material tension can hereby be realized in the resilient ring 7 between bulges 13 and the vertices of the nut, whereby a strong spring force is realized in an alternative manner between the groove and the nut by means of ring 7.

(14) A preferred embodiment is embodied as open-end wrench, whereby the ring is open on one side with an opening which is substantially slightly larger than one of the side views of the nut. The head of this open-end wrench is shown from the top in a sectional view. As is per se usual in the case of an open-end wrench, it comprises two nut engaging surfaces 21, 22 for engaging a nut.

(15) As in previous preferred embodiments, grooves 24 are arranged in these engaging surfaces 21, 22 for receiving two springs 25, 26, one on each side of the head. The springs extend from a placing recess 28, 29 in a respective groove with a variable depth. Realized by means of this variable depth of the groove is that the spring can move outward during placing of the nut in the head, such as between surfaces 21, 22.

(16) When the nut is inserted, the springs bring about engagement on either side of two opposite side surfaces of the nut. An end part 31 of the spring optionally engages round the placed nut. Alternatively, the lateral clamping of the springs will suffice.

(17) For the purpose of the dual embodiment of the spring on either side, the spring is embodied as if it were a bent staple. The spring has for this purpose two legs 26, 26 and an end bridge element 31 for the mutual connection. Realized in advantageous manner by means of such a preferred embodiment is that damage to spring end parts is prevented.

(18) The present invention has been described in the foregoing on the basis of several preferred embodiments. Different aspects of different embodiments are deemed described in combination with each other, wherein all combinations which can be deemed by a skilled person in the field as falling within the scope of the invention on the basis of reading of this document are included. These preferred embodiments are not limitative for the scope of protection of this document. The rights sought are defined in the appended claims.