Hand tools
First Claim
1. A hand tool comprising a hand holdable fluid powered actuator coupled by a flexible fluid conduit means to a fluid displacement device, the fluid powered actuator having operative elements mounted for relative movement therebetween, the fluid displacement device including a hand gripping means and a ground engagement means, said hand gripping means and said ground engagement means being mounted for relative movement therebetween to effect actuation of the fluid powered actuator, the fluid powered actuator having an operating member retained for movement against the action of biasing means, the operating member being coupled to at least one of said operative elements, the fluid displacement device further including first and second tubular elements slidingly interengaged, said hand gripping means being mounted with the first tubular element and the ground engagement means being mounted with the second tubular element, there being piston means slidingly engaged in the first tubular element and coupled by coupling means to the ground engagement means.
1 Assignment
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Accused Products
Abstract
A hand tool of a type where relative movement between operative elements is required. The hand tool includes a handpiece (C) and a separate fluid displacement device (P) which are coupled together by a flexible hose (H). The handpiece (C) has a fixed blade (36) and a movable blade (34). The displacement unit (P) has a handle (10) which can be moved relative to a ground engageable foot (18) thereby causing a piston (16) to displace fluid along the hose (H) and drive a piston (28) in handpiece (C) against the bias of a spring (38). Movement of piston (28) against the spring (38) causes cutting blade (34) to move toward blade (36). Spring (38) causes reverse movement of piston (28) upon pressure being released from the handle (10) to retract blade (34) from blade (36). The blades (34) and (36) can be replaced by other operative elments such as clamping jaws.
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Citations
16 Claims
- 1. A hand tool comprising a hand holdable fluid powered actuator coupled by a flexible fluid conduit means to a fluid displacement device, the fluid powered actuator having operative elements mounted for relative movement therebetween, the fluid displacement device including a hand gripping means and a ground engagement means, said hand gripping means and said ground engagement means being mounted for relative movement therebetween to effect actuation of the fluid powered actuator, the fluid powered actuator having an operating member retained for movement against the action of biasing means, the operating member being coupled to at least one of said operative elements, the fluid displacement device further including first and second tubular elements slidingly interengaged, said hand gripping means being mounted with the first tubular element and the ground engagement means being mounted with the second tubular element, there being piston means slidingly engaged in the first tubular element and coupled by coupling means to the ground engagement means.
- 5. A hand tool comprising a handpiece and a separate fluid displacement device, the handpiece having a fluid powered actuator and pair of operative elements, one of said operative elements being coupled to an operating member of the fluid powered actuator and the other of said operative elements fixed in position, a flexible conduit means communicating at one end with a first fluid chamber of the fluid powered actuator and at its other end with a second fluid chamber of the fluid displacement device, biasing means within the handpiece, the operating member being biased by said biasing means to a first position, the fluid displacement device having handle means and ground engagement means, the handle means being movable relative to the ground engagement means to cause fluid movement to occur in the first fluid chamber resulting in movement of the operating member from said first position against the bias of the biasing means.
Specification