Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Means includes element interfitting between working member...
Patent
1981-08-24
1984-04-17
Garrett, Robert E.
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Means includes element interfitting between working member...
92 18, 137 75, F15B 1526
Patent
active
044427565
ABSTRACT:
A temperature sensitive locking mechanism is provided for a fluid pressure actuator which will hold the shaft of the actuator in a spring compressing position until the occurrence of a pre-selected temperature in the vicinity of the actuator. Locking threads are provided on the exterior of the actuator, and a latching collet, having a plurality of peripherally spaced, internally threaded, latching arms cooperates with such threads and prevent movement of the actuator shaft by abutting a surface of a stop block which is in abutment with the actuator shaft. The radial faces of the threads are sufficiently angled so as to exert an outwardly directed camming force on the collet latching arms to permit the release of the latch under the axial forces produced by the spring bias on the actuator shaft. The collet latching arms are forcably retained in locked position by an encircling spring wire, the ends of which are connected by a fusible link. Expansion of the wire resulting from the link melting due to temperature increase causes the wire to un-coil and the above to occur.
REFERENCES:
patent: 2144893 (1939-01-01), Parker
patent: 2239673 (1941-04-01), Fowler
patent: 3463055 (1969-08-01), Bayles
patent: 3884125 (1975-05-01), Massie
patent: 4014415 (1977-03-01), Pickel
patent: 4093176 (1978-06-01), Contastin
patent: 4263839 (1981-04-01), Akkerman et al.
Baker CAC, Inc.
Garrett Robert E.
Meyer Richard S.
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