Kickout valve and circuit

Claim 1

In a hydraulic system comprising a hydraulic motor, a source of fluid under pressure, a first, control valve having an open position for directing fluid from said source to said motor for operation thereof, a spring means normally closing said control valve, a detent means for holding said valve in the open position, a line communicating pressure from between said control valve and said motor for releasing said detent means, a second, kickout valve in said line, said kickout valve being spring biased by kickout spring means to a normally closed position, means movable by said motor for opening said kickout valve thereby releasing said detent means and allowing the spring means of said first, control valve to return said first valve to its normally closed position wherein operation of the hydraulic motor is stopped, said kickout valve including a lever which is spring biased by said kickout spring means against a stop in its normally closed position, said motor comprising a cylinder having a cylinder rod reciprocally extendable from one end thereof, said means on said motor for opening said kickout valve comprising means on said cylinder rod for engaging said spring biased lever and wherein said kickout valve and lever are so positioned with respect to said cylinder rod as to be in the path of said means on said cylinder rod for opening said kickout valve when said rod is actuated, and wherein said kickout valve comprises a body, a first passage within said body having a reciprocable plunger therein, one end of said first passage being in fluid communication with said line, a ball check biased by a ball spring means contained within said first passage and contacting one end of said plunger as well as closing said first passage by sealing against a portion of said first passage, a second passage in said body at right angles to and intersecting said first passage, a rotatable shaft contained within said second passage and having a flat portion thereon receiving the other end of said plunger, a third passage within said body communicating said detent means and said first passage between said ball check and said second passage, said plunger being of a length with relation to the spacing of said flat portion to said ball check such that said ball check sealingly closes said first passage when said flat portion of said rotatable shaft is in contact with said other end of said plunger and wherein when said rotatable shaft is rotated to bring said other end of said plunger into contact with the full diameter of the shaft, said plunger displaces said ball check from its sealing position against said portion of said passage against the bias of said ball spring means and thereby allows fluid under pressure to flow from said line, through said first passage and around said spring and said ball check and into said third passage and hence into the detent means.