Expansible chamber devices – With assembly or disassembly facilitating means
Patent
1988-07-01
1989-12-05
Look, Edward K.
Expansible chamber devices
With assembly or disassembly facilitating means
92151, 92165R, 92168, 277 58, 277DIG10, 403 2, F01B 2908, F01B 700, F16J 1518
Patent
active
048844934
ABSTRACT:
Fluid actuator includes shear pins or threaded fasteners between a rod gland and a rod gland bearing which cause the rod gland bearing to separate from the rod gland in response to a predetermined jam clearance force being applied to the rod gland bearing upon engagement of a rod deformation either exteriorly or interiorly of the actuator with the rod gland bearing to clear such rod deformation. The shear pins or threaded fasteners are sized to withstand the usual internal pressures acting on the rod gland bearing. However, whenever a piston rod deformation engages the rod gland bearing, the entire actuator force is available to shear the shear pins or threaded fasteners which frees the rod gland bearing to allow movement of the rod gland bearing with the piston rod to clear the rod deformation. A single retainer plate may be used to retain both a plurality of headed shear pins and a retaining wire for the rod gland. Alternatively, a plurality of fasteners may be used in tension to secure a radial flange on the rod gland bearing to a radial end face of the rod gland. Also, a reduced area thickness may be provided on the radial flange in substantial axial alignment with a static seal between the rod gland and rod gland bearing to cause shearing of the radial flange at such reduced area thickness when a predetermined axial inward jam clearance force is applied to the piston rod in response to a rod deformation exteriorly of the actuator engaging the axial outer end of the rod gland bearing to free the rod gland bearing for movement with the rod to clear such rod deformation.
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Look Edward K.
Pneumo Abex Corporation
Williamson Mark A.
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