Torsion spring tensioning tool

Details Torsion spring tensioning tool Torsion spring tensioning tool

1995-11-13

1997-02-25

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

81486, 811763, B25B 1346

Patent

active

056050798

ABSTRACT:
A tool for applying rotational force to a coiled torsion spring of a door counterbalancing mechanism in order to wind the spring storing energy within the body of the spring. The tool includes a splittable housing which is fixedly mounted onto the winding cone of the torsion spring. The housing has a sprocket mounted thereon. On either side of the sprocket are annular grooves. Within one annular groove is to be located a right hand operated ratchet tool with a left hand ratchet tool connecting with the other annular groove. These ratchet tools are to be used sequentially in unison to create stored energy within the torsion spring.

REFERENCES:
patent: 2567563 (1951-09-01), Hribar
patent: 3651719 (1972-03-01), Wessel
patent: 3979977 (1976-09-01), Dorma
patent: 4142283 (1979-03-01), Walker
patent: 4253350 (1981-03-01), De Tarr
patent: 4526066 (1985-07-01), Steck
patent: 4691428 (1987-09-01), Engstrom

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