Speed wrench and hand grip combination

• US 5,005,448 A
• Filed: 12/19/1988
• Issued: 04/09/1991
• Est. Priority Date: 10/16/1986
• Status: Expired due to Term

• Current Assignee: Harvey M. Main
• Original Assignee: Harvey M. Main
• Inventors: Main, Harvey M.
• Primary Examiner(s): Smith, James G.
• Application Number:
  US07/287,476
• Time in Patent Office: 841 Days
• Field of Search: 81/58.1, 81/62, 81/63, 81/63.1, 81/63.2, 81/120, 81/121.1, 81/125, 81/177.1, 81/177.2, 81/492, 81/489, D 5/25, D 5/29
• US Class Current: 81/63
• CPC Class Codes: B25B 13/00 Spanners; Wrenches hand-driven gear-operated B25B17/00; impact wrenches B25B19/00; portable power-driven B25B21/00 ; spanners or wrenches pecially adapted for osteosynthesis A61B17/8875; machines for fitting together or separating metal parts B23P19/00 ; for mounting or dismounting wheels B60B29/003
• CPC Class Codes: B25B 13/461 with concentric driving and driven member
• CPC Class Codes: B25B 23/16 Handles in general B25G

Abstract

A speed wrench and complimentary hand grip, the wrench includes a casing which mounts a standard drive mechanism which has a drive member axially projecting from the casing in order to engage a work piece. The wrench has an added feature in the form of a drive head rigidly attached to the casing axially thereof on a side opposite the drive member. The drive head has parallel exterior sides and an interior axial cavity. Thus, the wrench may be torqued by both a normal auxiliary wrench having a wrench head that engages the exterior sides by a normal lug wrench which has a drive lug that may matably engage the cavity. The complimentary handle includes an annular grip portion and nestably receives the wrench. The hand grip has a cylindrical opening sized to receive the wrench casing and bail, and bail engagement means whereby rotation of the handle rotates the wrench. The opening also allows access to the drive head cavity while the handle and wrench are nested.

Claims

1. In a tool adapted to rotatable drive a work piece wherein said tool includes a casing with a cylindrical outer surface which mounts a drive mechanism having a drive member that projects axially from one side of the casing and that is adapted to selectively engage the work piece whereby rotation of said casing rotates said work piece, the improvement comprising a drive head rigidly attached to said tool and projecting axially from said casing on a second side thereof opposite said drive member, said drive head having a raised surface generally in a plane transverse to the common axis of said drive member and said drive head and having a plurality of flat exterior sides oriented along exterior planes which are parallel to said common axis, at least some of said exterior sides being parallel to one another, said drive head having an axial cavity formed in said raised surface, said cavity having a plurality of flat interior sidewalls oriented along interior planes which are parallel to said common axis, and a strap-like bail member extending across said casing on the second side thereof with said bail member having radial end portions attached to diametrically opposite outermost edge portions of said casing and extending upwardly therefrom coextensive with the cylindrical outer surface of said casing to maintain said bail in fixed set apart relation to a surface of said second side.

2. The improvement according to claim 1 wherein said cavity is square in cross-section about a plane transverse to said common axis and is adapted to matably engage a lug of an auxillary wrench whereby said auxillary wrench may be manipulated to apply leveraged mechanical torque to said drive member.

3. The improvement according to claim 1 wherein said drive head is directly attached to said casing.

4. The improvement according to claim 1 wherein said casing, said bail member and said drive head are formed of an integral one-piece construction.

5. The improvement according to claim 1 further comprising a hand grip sized to receive said tool in nested relation, said hand grip including an annular grip portion having an inner wall defining a cylindrical opening, a casing stop and a means for engaging said bail member, arrangement of said opening, said casing stop and said bail member engagement means being such that said hand grip will matably receive said casing and bail in a nested state whereby said hand grip may be rotated about said common axis to correspondingly rotate said work piece.

6. The improvement according to claim 5 including detent means on said hand grip for releasably retaining said hand grip and tool in the nested state.

7. The improvement according to claim 5 wherein said tool and said hand grip include registration means for permitting the nested state only at selected relative rotational positions.

8. The improvement according to claim 5 in which said hand grip further includes a circular drive ring, said drive ring having an inner edge defining a central circular opening with a diameter smaller than a diameter of said cylindrical opening, and in which said annular grip portion is molded unitarily about said drive ring in such a manner that said inner edge comprises said casing stop.

9. The improvement according to claim 8 in which said inner edge of said drive ring further comprises said bail engagement means.

10. The improvement according to claim 9 in which said bail engagement means includes bail engagement notches formed in said inner edge whereby said inner edge configures a keyway sized to engage the bail.

11. A speed wrench adapted to be both manually rotated abuot a central axis and selectively engaged by a wrenching tool having a working element in order to rotatably drive a tool that correspondingly drives a work piece, comprising:

a casing having a cylindrical exterior surface;

a reversible ratchet mechanism switchable between first and second drive states corresponding to opposite rotational drive directions, said drive mechanism being mounted in said casing and including a drive shaft projecting axially of said casing on a first side thereof adapted to couple a tool element whereby manual rotation of said casing will rotatably drive said drive shaft in a selected one of said drive directions;

a mechanical switch member connected to said ratchet mechanism to selectively switch said ratchet mechanism between said first and second rotational drive states; and

a drive head rigidly and axially attached to said casing on a second side thereof opposite said drive shaft and along a common axis therewith, said drive head comprising a bail member attached at opposite diametric locations on said casing and formed as a smooth uninterrupted extension of said cylindrical surface and having an opening sized to permit access to said mechanical switch member, said drive member configured to be engaged by the working element of said wrenching tool whereby said casing may be rotated with increased mechanical advantage by said wrenching tool.

12. A speed wrench according to claim 11 wherein said bail member having end portions rigidly attached to said casing.

13. A speed wrench according to claim 12 wherein said bail member has a strap-like configuration extending diametrically across said casing.

14. A speed wrench according to claim 11 wherein said drive head has a plurality of flat exterior sides oriented along exterior planes which are parallel to said common axis, at least some of said exterior sides being parallel to one another.

15. A speed wrench according to claim 14 wherein there are six exterior sides adapted to be engaged by said wrenching tool along the exterior of said drive head, said six exterior sides being organized as three parallel pairs of exterior sides in a generally hexagonal configuration.

16. A speed wrench according to claim 11 wherein said drive head has a cavity axially formed therein, and opening oppositely of said drive shaft, said cavity having a plurality of flat interior sidewall oriented along interior planes which are parallel to said common axis, said wrenching tool having a lug adapted to be matably received within said cavity.

17. The improvement according to claim 12 further comprising a hand grip sized to receive said tool in nested relation, said hand grip including an annular grip portion having an inter wall defining a cylindrical opening, a casing stop and a means for engaging said bail member, arrangement of said opening, said casing stop and said bail member engagement means arranged such that said hand grip will matably receive said casing and bail in a nested state whereby said hand grip may be rotated about said common axis to correspondingly rotate said work piece.

18. The improvement according to claim 17, further including detent means on saisd hand grip for releasably retaining said hand grip and tool in the nested state.

19. The improvement according to claim 18 wherein said tool and said hand grip include registration means for permitting the nested state only at selected relative rotational positions.

20. The improvement according to claim 18 further including a circular drive ring, said drive ring having an inner edge defining a central circular opening with a diameter smaller than a diameter of said cylindrical opening, said annular grip portion molded unitarily about said drive ring in such a manner that said inner edge comprises said casing stop.

21. The improvement according to claim 20 in which said inner edge further comprises said bail engagement means.

22. The improvement according to claim 20 in which said bail engagement means includes bail engagement notches formed in said inner edge.