Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1993-11-29
1995-02-28
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5729, 81 5746, B25B 1700
Patent
active
053926714
ABSTRACT:
A new and improved power-driven wrench apparatus includes a housing assembly which includes a gear box portion, a pair of flexible shaft retention portions that extend outwardly from the gear box portion, respective bearing supports located on the flexible shaft retention portions, and a wrench head bearing assembly supported by the bearing supports of the housing assembly. The first gear assembly receives power from a power source. A pair of flexible-shaft gear assemblies is provided wherein each assembly includes a respective driven gear which meshes with the first gear assembly. A respective flexible shaft is connected to the respective driven gear, and a respective worm gear is connected to the respective flexible shaft. The respective driven gears are housed in the gear box portion of the housing assembly, and the pair of flexible-shaft gear assemblies and the respective worm gears are housed in the flexible shaft retention portions of the housing assembly. A cylindrical wrench head assembly is supported by the wrench head bearing assembly on the flexible shaft retention portions of the housing assembly. The cylindrical wrench head assembly includes a circumferential array of gear teeth for meshing with the respective worm gears of the flexible-shaft gear assemblies, such that the worm gears of the flexible-shaft gear assemblies rotate the cylindrical wrench head assembly around a central longitudinal axis which is perpendicular to the plane in which the flexible shaft retention portions of the housing assembly lie.
REFERENCES:
patent: 2693728 (1954-11-01), Shaff
patent: 3668949 (1972-06-01), Walker
patent: 4215601 (1980-08-01), Mann
patent: 4322989 (1982-04-01), Garolis
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