Leverage screwdriver

• US 4,000,767 A
• Filed: 10/09/1975
• Issued: 01/04/1977
• Est. Priority Date: 10/09/1975
• Status: Expired due to Term

• Current Assignee: Jerome F. Geng
• Original Assignee: Jerome F. Geng
• Inventors: Geng, Jerome F.
• Primary Examiner(s): Smith, Al Lawrence
• Assistant Examiner(s): Zatarga, J. T.
• Application Number:
  US05/621,009
• Time in Patent Office: 453 Days
• Field of Search: 145/61 L, 145/50 R, 145/50 B, 145/61 G, 145/65
• US Class Current: 81/436
• CPC Class Codes: B25G 1/005 for screwdrivers, wrenches or spanners with additional levers, e.g. for increasing torque

Abstract

A leverage screwdriver assembly with a screw-driving tool receivably held at one end thereof within a drilled axial hole in the end of a gripping handle has a leverage handle pivotally secured to the gripping handle by means of coupling engagement therewith through a pivot member extending transversely through the axial hole. The pivot member, in addition to pivotally coupling the leverage and gripping handles, engages a bearing surface of the tool within the hole to restrain it against both longitudinal and rotary motion relative to the gripping handle.

Claims

1. A hand tool assembly for turning rotary fasteners, comprising:

a tool having a fastener-engaging end, an end opposite the fastener-engaging end, and an exterior bearing surface extending from said opposite end toward the fastener-engaging end; and

a handle assembly including

an elongate gripping handle with an axial hole at one end thereof receiving therewithin the opposite end of the tool,

an elongate leverage handle, and

a pivot member extending transversely into the axial hole through at least a portion of the gripping handle between one side thereof and the axial hole,

said pivot member being in coupling engagement outside of the axial hole with the leverage handle to secure it and the gripping handle together for relative pivotal movement therebetween and

being in engagement with the bearing surface of the tool within the hole to prevent axial rotary movement of the tool relative to the gripping handle while releasably restraining the tool against separation from the handle.

2. The hand tool of claim 1 in which said gripping handle has a pair of aligned transverse holes therethrough on opposite sides of the hole for receivably holding said pivot member, and said pivot member extends across the axial hole through said aligned holes.

3. The hand tool of claim 2 in which said gripping handle has a groove aligned and communicating with the pair of aligned holes and opening into the axial hole, and said pivot member resides partially in said groove and partially protrudes into the axial hole.

4. The hand tool of claim 2 including a pair of projecting head members respectively carried at a pair of opposite ends of the pivot member for restraining the pivot member against movement out of the aligned holes.

5. The hand tool of claim 4 in which said pair of opposite ends respectively extend through a pair of pivot openings in the leverage handle and the opposite ends of the pivot member are held in coupling engagement with the pivot openings by said head members.

6. The hand tool of claim 1 in which said pivot member extends through said gripping handle and has a pair of opposite ends protruding from opposite sides thereof in coupling engagement with the leverage handle.

7. The hand tool of claim 6 in which said leverage handle has a pair of substantially parallel legs secured to opposite ends of a cross-member and extending away therefrom toward the gripping handle on opposite sides thereof, and each of said legs has a pivot opening in pivotal coupling receipt of the opposite end of the pivot member adjacent thereto.

8. The hand tool of claim 7 wherein said leverage handle is movable between a closed position in which said gripping handle is sandwiched between the pair of opposite leg members and underlying the cross-member to an operative position in which the leverage handle extends substantially normal to the elongate axis of the gripping handle.

9. The hand tool of claim 1 in which said axial hole is cylindrical and said opposite end of the tool has a cylindrical section joined with said bearing surface of a diameter substantially equal to that of the axial hole, and said bearing surface is a planar chordal section spaced radially from the center axis of the cylindrical section by a distance substantially equal to the radial distance of the pivot member from the center axis of the axial hole.

10. The hand tool of claim 9 in which said axial hole is a cylindrical hole.

11. The hand tool of claim 9 in which the engagement of the innermost surface of the pivot member against the bearing surface frictionally restrains the tool against longitudinal movement relative to the gripping handle.

12. The hand tool of claim 11 in which the opposite end of the tool fits snugly between the side walls of the axial hole and the pivot member, and said gripping handle has a hole communicating with the axial hole from without the gripping handle for release of air from therewithin during insertion of the opposite end of the tool into the axial hole.