Cushioning means for hydraulic system

Claim 1

IN A CUSHIONING MEANS FOR A HYDRAULIC SYSTEM THE COMBINATION OF A CONTAINER HAVING CLOSED ENDS WITH AN APERTURE THROUGH EACH END, A TUBE-LIKE RESILIENT DIAPHRAGM ARRANGED WITHIN SAID CONTAINER WITH THE ENDS THEREOF ALIGNED WITH AN OPERATIVELY CONNECTED AND SEALED TO SAID APERTURES AS TO DEFINE A CLOSED CIRCUIT FROM ONE APERTURE TO THE OTHER THROUGH THE CONTAINER, A HELICALLY WOUND COIL ARRANGED WITHIN SAID DIAPHRAGM AND SUPPORTED AT EACH END IN LIMITED LONGITUDINAL SLIDING ENGAGEMENT WITH SAID APERTURES, SAID COIL HAVING AN OUTER DIAMETER SLIGHTLY LESS THAN THE NORMAL INNER DIAMETER OF SAID DIAPHRAGM, AND SAID COIL HAVING A SUBSTANTIALLY SMOOTHLY CONTOURED OUTER SURFACE WITH THE LONGITUDINAL SECTIONAL WIDTH OF THE CONVOLUTION FORMING MEMBERS THEREOF BEING SUBSTANTIALLY GREATER THAN THE SPACING BETWEEN CONVOLUTIONS, SAID COIL HAVING A UNIFORM HELICAL SLIT FORMED BETWEEN THE CONVOLUTIONS THEREOF, AND MEANS TO PASS FLUID INTO SAID CONTAINER BETWEEN THE OUTER SURFACE OF SAID DIAPHRAGM AND THE INNER SURFACE OF THE SAID CONTAINER.