Hydraulic force resister

Details Hydraulic force resister Hydraulic force resister

1977-06-24

1979-04-10

Pinkham, Richard C.

Undertaking

272143, 272DIG5, A63B 2100

Patent

active

041484797

ABSTRACT:
A push-pull isokinetic exerciser composed of inner and outer telescoping tubes whose ends have handle pieces attached thereto. The inner tube defines an oil-filled chamber which encloses a piston whose actuating rod is attached to the handle end of the outer tube. The piston divides the chamber into right and left sections provided with valves that function alternately to allow oil to pass from the right section to the left section when the tubes are brought together by the handle pieces in a compression stroke, and that allow oil to pass from the left section to the right section when the tubes are pulled apart in an expansion stroke. The motion in the compression and expansion strokes is linear and affords uniform resistance to motion throughout the entire length of each stroke, so that the exercising effect is even and free of strain. Each handle piece is constituted by a cap which covers and protects the end of the tube to which it is attached, a U-shaped yoke secured to the base of the cap and having arms projecting therefrom and a handle bridging the arms, the handle having a longitudinal bore therein to receive the mid-section of a crossbar, whereby the user may engage the handle piece with either hand or foot, or may engage the ends of the crossbar protruding from the handle with both hands or both feet.

REFERENCES:
patent: 767008 (1904-08-01), Pelletier et al.
patent: 2825563 (1958-03-01), Lawton
patent: 3782722 (1974-01-01), Webb
patent: 3834696 (1974-09-01), Spector

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