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Home Generators or Motors Hand-held-power-operated-shears

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 Hand held power operated shears

Details
Inventors: Herrmann, Raymond J.;
Assignee: Bettcher Industries, Inc. (Birmingham, OH)
Primary Examiner: Nilson; Robert G.
Assistant Examiner:
Attorney, Agent or Firm: Watts, HOffmann, Fisher & Heinke

A servo valve comprises a valve body, an elongated chamber defined by the body and two oppositely facing annular pistons independently movable longitudinally within the body. Each piston has an inner annular first valve seat and an outer annular first obturating surface. A reciprocable valve stem is surrounded by the pistons. Two oppositely facing spaced annular second obturating surfaces are carried by the valve stem a fixed distance apart, with the pistons located between the two second obturating surfaces and reciprocable on the valve stem. Each of the second obturating surfaces is arranged to cooperate with one of the inner annular first valve seats to control fluid flow along the valve stem from a fluid inlet intermediate the pistons. Two annular second valve seats are fixed in the valve body. Each of the annular second valve seats is located to contact the outer annular first obturating surface of one of the two pistons to limit the longitudinal movement of the pistons away from each other and to control fluid flow past the outer annular first obturating surfaces. The pistons each include a surface for transmitting force to the piston in a direction away from the other piston.

DETAILED DESCRIPTION The present invention is directed to hand held power operated shears.
The power operated shears of the present invention overcome the shortcomings of the known power operated shears mentioned above and others by being closely similar in physical arrangement and operation to that of conventional manually operated scissors.
Other operating advantages of the hand held power operated shears of the present invention include a controllable rate of closing of blades and a controllable extent of closing.
The shape and orientation of the blades of the shears of the present invention and the relationship of the handles to the blades is similar to that of conventional scissors.
In use, one handle pivots independently of the two blades and the other handle.
Relative pivotal movement of the blades is controlled through linkages and a servo mechanism so the operation replicates that of conventional manually powered scissors.
During operation of the shears of the present invention, blade movement follows handle movement between relative open and closed positions of the blades.
The attitude of use and physical arrangement of the shears of the present invention is ergonometrically advantageous.
In particular, the relative arrangement of the handles and of the blades minimizes deviation from a natural wrist orientation in typical use.
The relative handle position and the force multiplier provided by a power actuator helps to relieve overuse injuries.
A relative reduction in the amount of handle movement required to close the blades provides a reduction of effort required by an operator which should result in a reduction of overuse injuries.
Improved cutting control is provided by changing the force and speed profiles as the blades close.
That is, the speed of blade movement is reduced relative to the speed of handle movement as the blades move towards the closed position.
Concurrently, the force of closing is increased to compensate for a decrease in mechanical advantage as the blades close


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