초록 ▼

An improved push-pull cable assembly (10) is provided with means for automatically compensating for changes in the cable\s effective length, thus requiring a minimum of adjustment over an extended period. To this end, the cable\s actuating rod (124) may be provided with a spring-loaded backlash comp

An improved push-pull cable assembly (10) is provided with means for automatically compensating for changes in the cable\s effective length, thus requiring a minimum of adjustment over an extended period. To this end, the cable\s actuating rod (124) may be provided with a spring-loaded backlash compensating coupling (30) operatively connecting the actuating rod with an operating lever (106) on the controlled mechanism. A helical compression spring (198) is provided at the end of the push-pull cable assembly such that the spring exerts a compressive force in the longitudinal direction of the actuating rod between a spring retainer (196) and a clevis fitting (122) pivotally connected to the controlled mechanism\s operating lever. The clevis fitting is slidably mounted with respect to the actuating rod such that the spring will tend to displace it from a compressed position (210) closer to the spring to an extended position (216) further away. The positions of both ends of the spring are adjusted with respect to the actuating rod such that the spring\s compressive force will exceed the force required to operate the valve and also any backlash will be fully taken up and a continuing force applied to the lever when a handle (116) at the other end of the cable is fully pushed in.

대표청구항 ▼

In a push-pull mechanism for moving a lever arm on a control device from a normal position established by an integrally provided stop to an alternative position, said push-pull mechanism comprising a flexible inner cable, an operating handle operatively connected at one end of said cable, an actuati

In a push-pull mechanism for moving a lever arm on a control device from a normal position established by an integrally provided stop to an alternative position, said push-pull mechanism comprising a flexible inner cable, an operating handle operatively connected at one end of said cable, an actuating rod having first and second ends, said first end operatively connected at a second end of said cable, and an outer sheath for restricting any spiraling or undulating tendencies in said inner cable so that said actuating rod will be caused to move a predetermined distance in a first longitudinal direction in response to said handle being moved by a distance equal to said predetermined distance plus a backlash distance from a pushed-in to a pulled-out position and to move in all opposite longitudinal direction when said handle is moved from said pulled-out position to said pushed-in position, the improvement comprising: a spring-loaded backlash compensating coupling operatively connecting said actuating rod with said lever, said spring-loaded coupling being provided with a first adjusting means for determining an effective distance between said lever and said operating handle when said handle is in its pulled-out position and with a second adjusting means for determining a pre-load compressive force exerted by said coupling against said lever when said handle is at a fully pushed-in position.