Motors: expansible chamber type – Extension of unit having separately controlled working... – Control of motive fluid for one working member in response...
Patent
1986-06-19
1988-03-29
Garrett, Robert E.
Motors: expansible chamber type
Extension of unit having separately controlled working...
Control of motive fluid for one working member in response...
91167R, 91167A, F15B 1118
Patent
active
047335980
ABSTRACT:
A telescopic device for use in a crane jib, forklift truck, lighting tower, access platform or the like, having at least two extandable sections extending from a base section, in which each said extendable section is extended by a piston and cylinder assembly and in which, to extend the device, a similar hydraulic pressure is applied in the extension mode to all the assemblies and different hydraulic pressures are caused to exist in all the assemblies in the retraction mode, so that a selective extension sequence of the sections is effected.
REFERENCES:
patent: 3188917 (1962-10-01), Quale
patent: 3734464 (1973-05-01), Bushnell, Jr.
patent: 3754666 (1973-08-01), Suverkrop
patent: 3882759 (1975-05-01), Formwalt et al.
Bishop Robert B.
Innes Gordon
Denion Thomas E.
Garrett Robert E.
The 600 Group PLC
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