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US 5,311,797 AGranted
Pressure-operated power wrench
AssigneePaul-Heinz Wagner
InventorsKlaus Ruessmann, Thomas Beyert, Paul-Heinz Wagner
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AssigneePaul-Heinz Wagner
InventorsKlaus Ruessmann, Thomas Beyert, Paul-Heinz Wagner
Estimating the term…
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).
A pressure-operated power wrench comprising a housing (10) which includes a working cylinder (17) with a working piston (25) movable therein, a headpiece (11) being connected to said housing (10) and comprising a rotatable annular member (43) which is coupled, for being taken along by rotation, to a lever (41) engaging said working piston (25), and an additional piston (29) being connected to said working piston (25) and being arranged in an additional cylinder (21) on the side opposite to said working cylinder (17),
Dependencies are inferred from the claim text.