Patent ID: 8656825

Claim:
A composite material telescopic multi-cylinder hydraulic hoist said telescopic multi-cylinder hydraulic hoist being formed of composite material and being operable to undertake heavy duty applications, comprising: (a) an outer stage cylinder having one end sealed by a base member and an open end, formed of the composite material; (b) at least one additional cylinder disposed within the open end of the said outer stage cylinder such that there is an overlap between said cylinder stages, said at least one additional cylinder stage being formed of the composite material; (c) a hydraulic fluid port in communication with an interior of the cylinder stages; and (d) at least one seal mounted between cylinder stages, whereby forcing hydraulic fluid into said hydraulic fluid port causes said at least one additional cylinder stage to extend relative to said outer cylinder stage; whereby the cylinder stages have a modulus of elasticity which allows the cylinder stages to expand under the force of a momentary pressure spike, and upon release of the pressure spike, to retract to their original configuration.