Abstract: The felling head is operatively installed at the front end of a tractor vehicle, and used for debrushing a brush covered terrain. It comprises a rigid framework, from which downwardly depends a pair of flat, spaced-apart elongated skates that slidingly rest on the ground and support the framework over ground. A pair of discoid saw blades are rotatably supported by the frame, with a ground clearance of a few inches relative to the plane of the skates. The framework is hingedly attached to the tractor vehicle by of a pair of linked parallel parallelograms forced into a common pivotal displacement, each having four rigid bars hingedly attached to one another so as to form a parallelogram configuration. A pair of hydraulic cylinders act on the parallelograms and on the frame, so as to allow vertical linear movement of the frame and a distinct vertical pivotal movement thereof.

Abstract: The snow discharge spout pipe from a snowblower is conventionally extended by spout extensions commanded by control rod linkages. The present ball and socket joints are used to interconnect each pair of successive link arms to one another, and some link arms to the snowblower casing. These joints are of the universal joint type, including a ball rotatable into a spherical socket. Each end of a link arm has such a joint. Each socket is composed of two ring members in mutual contact at their flat inner radial faces. These faces are precisely machined to obtain the desired clearance between the spherical surfaces of the ball and ring members. Each ball includes an axial bore, rotatably receiving a shoulder bolt. The bolt and ball have lubricating passages opening at the relatively movable bearing surfaces of the bolt, ball and ring members.