Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Includes interfitting parts engageable at plural positions...
Patent
1982-04-05
1984-07-03
Garrett, Robert E.
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Includes interfitting parts engageable at plural positions...
92 23, 92 29, 92 52, 92 53, 91169, F15B 1526
Patent
active
044572123
ABSTRACT:
A hydraulic ram for use in thrust-jacking of tunnel linings comprises a cylindrical outer member, a cylindrical inner member reciprocable within the outer member, and an extension member reciprocable within the inner member. A two-part clamping ring is provided for releasably locking the extension member to the inner member. An auxiliary drive is provided for retracting the extension member rapidly within the inner member. The auxiliary drive may be a mechanical spindle drive, or a hydraulic drive having an auxiliary piston reciprocable within an axial bore formed in the extension member. The clamping ring comprises spring means for urging the parts of the clamping ring in to the closed position, and piston-and-cylinder means for urging the parts of the clamping ring apart, against the biasing force of the spring means, to open the clamping ring.
REFERENCES:
patent: 2139185 (1938-12-01), Engel
patent: 2275722 (1942-03-01), Bowen
patent: 2604076 (1952-07-01), Trevaskis
patent: 2933070 (1960-04-01), Trumper et al.
patent: 4227850 (1980-10-01), Farmer et al.
Heitkamp Herbert
Hessel Heinz
Lagodka Manfred
Plester Karl-Heinz
Unger Eberhart
Garrett Robert E.
Gewerkschaft Eisenhutte Westfalia
Moritz Scott L.
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