Pressure-operated power wrench

Details Pressure-operated power wrench Pressure-operated power wrench

1993-03-11

1994-05-17

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

173218, B25B 1346

Patent

active

053117972

ABSTRACT:
The power wrench has a substantially T-shaped configuration and comprises a transversely extending housing (10) and a headpiece (11) extending centrally therefrom. The housing (10) comprises a working cylinder (17) and an additional cylinder (21). Both cylinders guide a unit (60) having at the one end a working piston (25) and at the other end an additional piston (29). The lever (41) of the headpiece (11) engages in a coupling member (27). The additional cylinder (21) drives the return stroke. Its area is substantially smaller than that of the working cylinder (17), so that the return movement does not require much hydraulic fluid. The headpiece (11) can easily be exchanged. Its lever (41) loosely engages in the coupling member (27) of the unit (60).

REFERENCES:
patent: 4339968 (1982-07-01), Krieger
patent: 4765210 (1988-08-01), Mierbach et al.
Llhydraulik Grundlagen und Anwendung; 7th Edition, VEB Verlag Technik Berlin, 1961, p. 97.

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