Spring devices – Fluid – Expansible-contractible chamber device
Patent
1976-04-13
1977-08-30
Cherry, Johnny D.
Spring devices
Fluid
Expansible-contractible chamber device
267 65R, F16F 902
Patent
active
040450082
ABSTRACT:
A gas spring, particularly adapted as a lifting means for hatch backs or trunk lids of motor vehicles, comprises a piston rod acting as a displacement piston, a housing cylinder containing a compressed gas, a guide piston near one end of the piston rod and in slidable relationship with the interior of the cylinder housing, characterized in that the piston rod is provided with an extension projecting beyond the guide piston, the closed end of the cylinder housing having a complementary receptacle for the piston rod extension, whereby when the piston rod is fully retracted into the cylinder housing, the extension enters the complementary space in the housing in a sealing manner, a valve being provided to permit the escape of fluid from the space as the extension passes thereinto, whereby the force acting to extend the piston rod is reduced to zero or nearly zero in the vicinity of the fully retracted position of the piston rod.
REFERENCES:
patent: 2071701 (1937-02-01), Mejean
patent: 2616687 (1952-11-01), Butterfield
patent: 3147966 (1964-09-01), Axthammer et al.
patent: 3559776 (1971-02-01), Schultze
patent: 3825244 (1974-07-01), Bauer
patent: 3937450 (1976-02-01), Bauer
patent: 3963225 (1976-06-01), Nicholls
patent: 3963227 (1976-06-01), Molders
Cherry Johnny D.
Suspa Federungstechnik Fritz Bauer & Sohne OhG
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