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Class Information
Number: 81/454
Name: Tools > Wrench, screwdriver, or driver therefor > Having work engaging and force exerting portion inserted into cavity (e.g., allen wrench, screwdriver) > With separate means for guiding or gripping work > Having pivoted, relatively movable, work gripping members
Description: Gripping means having two or more relatively movable members which grip the work between their work-contacting surfaces, at least one of the members being pivotally attached to the tool.

Sub-classes under this class:

Class Number Class Name Patents
81/455 With camming or wedging element for moving members 15

Patents under this class:

Patent Number Title Of Patent Date Issued
8596512 Clamping mechanism for an electric hammer Dec. 3, 2013
8347763 Wrench with a quickly rotatable driving head Jan. 8, 2013
8156847 Undercut screw feature and driver Apr. 17, 2012
8087329 Screwdriver for bone screws Jan. 3, 2012
7913593 Installation tool for a threaded object Mar. 29, 2011
6314845 Clamp for screwed fastening member Nov. 13, 2001
6145982 Eyeglass screwdriver Nov. 14, 2000
5797302 Screwdriver adapted to be coupled to an electric drill for automatic rotation thereof Aug. 25, 1998
5671642 Centering mechanism for a fastener driving device Sep. 30, 1997
5423825 Spinal fusion instruments and methods Jun. 13, 1995
5088359 Fastener nose piece feeder Feb. 18, 1992
4862774 Screw holder Sep. 5, 1989
4707900 Cylinder liner sleeve puller Nov. 24, 1987
4611515 Tool for control and use of miniature screws and threaded fasteners Sep. 16, 1986
4581963 Screw holding device for screwdrivers Apr. 15, 1986
4581962 Tool to capture, control and manipulate threaded fasteners Apr. 15, 1986
4539874 Tool driver and fastener apparatus Sep. 10, 1985
4462283 Screw driver apparatus Jul. 31, 1984
4455898 Tool for capture, control and manipulation of threaded fasteners Jun. 26, 1984
3949795 Sink clip inserting device Apr. 13, 1976

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