Piston lock for power cylinders

Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Engages member coaxial with and rotatable relative to...

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92 20, 92 28, 92 29, F15B 1526

Patent

active

050204181

ABSTRACT:
A power cylinder of the type in which the piston may be locked to maintain the associated tool or clamp in a fixed position. A pair of guide rods extend in parallel spaced fashion through the bore of the cylinder from end to end of the cylinder and the piston includes a pair of spaced apertures passing the guide rods so that the piston may slide within the bore of the cylinder on the guide rods. The piston apertures are internally threaded and the guide rods include an externally threaded portion so that, following movement of the piston within the bore through a rapid advance portion of its stroke under the influence of pressure fluid, the internal threads in the piston apertures are brought into engagement with the externally threaded portions of the guide rods and the guide rods are thereafter rotated so as to threadably advance the piston to its final desired position in which the piston is lockingly held by the coacting threads. Rotation of the guide rods is achieved in one embodiment by a rack and pinion arrangement and is achieved in another embodiment by an air motor.

REFERENCES:
patent: 2773485 (1956-12-01), Geyer
patent: 2815005 (1957-12-01), Geyer
patent: 2886008 (1959-05-01), Geyer et al.
patent: 2918786 (1959-12-01), Geyer
patent: 2970573 (1961-02-01), Geyer
patent: 3236489 (1966-02-01), Mattocks et al.
patent: 3576151 (1971-04-01), Sendoykas
patent: 3668977 (1972-06-01), Beidler
patent: 3702535 (1972-11-01), House
patent: 3732783 (1973-05-01), Emenaker
patent: 3763747 (1973-10-01), Beichel et al.
patent: 4196654 (1980-04-01), Stearns
patent: 4462768 (1984-07-01), Westmoreland
patent: 4790234 (1988-12-01), Hampejs et al.

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