Multi-stage extendible and contractible shaft with shock absorpt

Details Multi-stage extendible and contractible shaft with shock absorpt Multi-stage extendible and contractible shaft with shock absorpt

1974-08-02

1976-08-10

Schwadron, Martin P.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91408, 92 2, 92 52, 92 53, 92 85B, 92111, 92113, 92152, F15B 1522, F01B 1102

Patent

active

039734684

ABSTRACT:
An extendible and contractible shaft comprises a number of shaft members on a common longitudinal axis, each except the outermost member being telescoped within the one next adjacent. Each telescoped member has a piston slidably sealed to the inner wall of the next adjacent outer member to form a series of tandem arranged sealed pistons. Fluid passageways are provided between adjacent shaft members so that fluid supplied under pressure to an inlet port of the device flows through the passageways to all the piston heads, thereby extending the telescoped shaft members and at the same time driving fluid out from under each piston through fluid passageways to an exit port of the device. When the pressurized fluid flow is reversed to send pressurized fluid to the undersides of the pistons, thereby driving fluid above the piston heads out through the first mentioned port, there would normally be incurred substantial shock as each piston head strikes its stop in the retraction operation. The shock is prevented by provision of an annular rim at one or more of the piston heads with surfaces which gradually meet a corresponding surface of the next outer shaft member, thus progressively restricting the outward flow of fluid from above the piston heads and slowing down the retraction sufficiently to prevent shock. In another aspect a surface of the piston gradually meets a port exiting from above this piston to meter and slow down the outward fluid flow.

REFERENCES:
patent: 1548182 (1925-08-01), Burgin
patent: 3136221 (1964-06-01), Walker
patent: 3138066 (1964-06-01), Walker
patent: 3264952 (1966-08-01), Winders
patent: 3267815 (1966-08-01), Ortman et al.
patent: 3483798 (1969-12-01), Parrett
patent: 3559535 (1971-02-01), Connolly
patent: 3610100 (1971-10-01), Hoffman
patent: 3768578 (1973-10-01), Russell, Jr.
patent: 3838625 (1974-10-01), Bell

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