Spring devices – Fluid – Expansible-contractible chamber device
Patent
1981-12-10
1984-01-03
Barefoot, Galen L.
Spring devices
Fluid
Expansible-contractible chamber device
267130, 267124, 267 6426, 267140, 267141, F16F 700
Patent
active
044238592
ABSTRACT:
An impact damper for use, for example, between the stationary and reciprocating parts of a stamping machine to reduce the noise produced at the end of each stamping operation, consists of a two-stage telescopic gas pressure cylinder 10. A base 3 of the cylinder is fixed on the stationary part of the machine and the head 33 of an internal piston 14 is in permanent engagement with the reciprocating part 6. As the part 6 moves downwards, the piston 14 is retracted, but at first an external piston 13 remains stationary. There is therefore a small resistance to movement of the part 6. As the part 6 approaches the end of its downward movement at which noise is generated at the end of a stamping operation, the head 33 engages a ring 34 at the upper end of the external piston 3 so that the external piston also then starts to be retracted. The resistance to downwards movement is thus greatly increased as both the effective piston area and the gas pressure within the cylinder increase and thus the end part of the movement of the part 6 is cushioned.
REFERENCES:
patent: 1576152 (1962-03-01), Staats-Oels
patent: 2791094 (1957-05-01), Opitz
patent: 2939696 (1960-06-01), Tuczek
patent: 3180634 (1965-04-01), Heiser
patent: 3228638 (1966-01-01), Burch
patent: 3499505 (1970-03-01), DeCarbon
patent: 4005763 (1977-02-01), Wallis
Barefoot Galen L.
Brahan Thomas J.
Profil-Verbindungstechnik GmbH & Co. KG
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