Tools – Wrench – screwdriver – or driver therefor – Handle or shank
Patent
1990-05-02
1990-10-02
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Handle or shank
16115, B25G 104
Patent
active
049600150
ABSTRACT:
An extendable torque bar has a multi-sided rack member with teeth extending along a side, which fits within a tubular member whose bore has a geometric configuration corresponding to the rack member. The rack member has an adapter for engaging a socket for a nut or bolt, or the like. The tubular member has a second adapter at its rear end for engaging a tool or other driving mechanism. A pawl is supported by an annular member which is affixed to the tubular member. The annular member has an outer surface shaped like the frustum of a cone. The pawl fits through an opening in the annular member and is held in place and pivots about a pivot member projecting through the annular member. The teeth of the pawl contact the teeth of the rack member by extending through a slotted opening in the tubular member. When the pawl teeth are in contact with the rack teeth, the edge of the pawl opposite the side of the pawl containing the teeth coincides with the plane of the outer surface of the annular member. A sleeve fits over the pawl and annular member. The top inner surface of the sleeve corresponds to the outer surface of the annular member and envelops that outer surface. The sleeve is slidable along the tubular shaft and locks the bar when it is urged against the annular member by biasing means.
REFERENCES:
patent: 2963930 (1960-12-01), Clothier et al.
patent: 4317393 (1982-03-01), Graffam
patent: 4703677 (1987-11-01), Rossini
patent: 4754670 (1988-07-01), Raymond
Drew Michael V.
Meislin D. S.
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