Power take-off

Claim 1

A power take-off unit attachable to an engine to support a pulley equipped pump of a hydraulic system in a position to be connected by a belt to a pulley on the crankshaft of a vehicle engine, said unit including a bracket attachable to said engine above and at one side of said shaft pulley, an arm, a pivotal connection between said arm and said bracket enabling said arm to swing in a vertical plane normal to the axis of the shaft and establishing a short inner end arm portion including a seat and a substantially longer outer arm portion including a manually engageable end and an intermediate concave seat, means operable to secure said pump to said concave seat with the pump pulley in transverse alignment with the shaft pulley, adjustable resilient means supported by said bracket and including an upwardly extending, adjustably backed coil spring the lower end of which is close to but above the seat in the shorter arm portion and said pivotal connection, a rod entrant of the seat in the shorter arm portion, and a connection between said rod and the lower end of said spring transmitting the pressure of said spring to the arm through the rod, said resilient means yieldably opposing movement of said pump towards said shaft pulley from a first position into a second position in which a belt may be placed in trained engagement with both pulleys or removed therefrom and in said first position, providing wanted tension on the belt, the distance between said pivotal connection and said manually engageable end portion of said arm being enough greater than the distance between said connection and the seat of the inner end of the arm such that mechanical advantage is afforded the user that the resistance of said resilient means encountered moving and holding the pump in said second position can be overcome with one hand while removing or replacing the belt with the other hand.