Expansible chamber devices – Piston – Non-circular
Patent
1988-08-22
1990-05-29
Garrett, Robert E.
Expansible chamber devices
Piston
Non-circular
92192, 92193, 277208, 277165, 384 32, F16J 100
Patent
active
049285777
ABSTRACT:
It is a question of a piston and cylinder unit comprising a cylinder barrel defining a piston space, a piston able to run axially in said barrel with a support action due to a peripheral bearing surface of the barrel. The piston includes at least one annular running belt which is coaxially arranged thereon along part of the length of the piston. The belt has a surface facing radially outwards which makes contact with the inner bearing surface of the barrel with sliding fit to support the piston, while an inwardly directed surface of the belt bears on an outer peripheral surface of the piston, which is spaced from the bearing surface of the barrel. The belt further has an inwardly directed retainer spur fitting into a groove-like peripheral recess in the piston. The belt is made of a material with resiliently elastic properties and is interrupted at one position on its periphery so that in the fitted condition of the belt there is a closed interruption able to be opened out for fitting purposes.
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Denion Thomas
Garrett Robert E.
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