Chute for front end discharge concrete mixers

Claim 1

In a self propelled front end discharge concrete mixer unit having a bowl adapted for discharging concrete at the forward end of the unit, a movable chute including a pivot mounting between said movable chute and said mixer unit, a first power cylinder adapted for swinging the movable chute about its pivot at the forward end of the concrete mixer unit, said chute having two complementary sections consisting of a mounted section and an extendable section, and a hinged connection therebetween whereby said extension section is movable from a retracted doubled over position relatively to said mounted section to a second position wherein the extension section forms an elongated continuation of the mounted section, a fluid motor actuator including a cam, a cam follower forming a part of said extendable section and operatively engagable by said cam which biases the cam follower and extendable section about said hinged connection to displace said section from its retracted position to its extended position, locking means for defining the fully extended position of said extendable section wherein said first and second sections form complementary extensions of each other, and spring means biasing said cam to a position whereby said cam is disengagable with said cam follower when the retracted section of said chute is swung downwardly with the mounted chute section and providing for retractile movement of said cam as the extension chute is swung from extended to retracted position.