Abstract: A suspension for a tracked vehicle includes a bogie wheel assembly which has a pair of bogie wheels mounted to a walking beam. The walking beam is coupled to a body of the vehicle by a transversely-extending arm. The arm may be coupled to the body by a spherical bearing which permits angular rotation in at least two directions. The walking beam is connected to the body by shear members arranged in an inverted-V configuration. The shear members may be elastomeric springs.

Abstract: A suspension for a tracked vehicle includes a bogie wheel assembly which has a pair of bogie wheels mounted to a walking beam. The walking beam is coupled to a body of the vehicle by a transversely-extending arm. The arm may be coupled to the body by a spherical bearing which permits angular rotation in at least two directions. The walking beam is connected to the body by shear members arranged in an inverted-V configuration. The shear members may be elastomeric springs.

Abstract: A suspension for a tracked vehicle includes a bogie wheel assembly which has a pair of bogie wheels mounted to a walking beam. The walking beam is coupled to a body of the vehicle by a transversely-extending arm. The arm may be coupled to the body by a spherical bearing which permits angular rotation in at least two directions. The walking beam is connected to the body by shear members arranged in an inverted-V configuration. The shear members may be elastomeric springs.

Abstract: A feed roll for tree handling has a number of strips which substantially cover its outer face. The strips have leading and trailing edges shaped to interdigitate with one another. A layer of resilient or slippery material is located between the strips and a drum. The strips can rock slightly.

Abstract: A feed roll for tree handling has a number of resiliently mounted strips which substantially cover its outer face. The strips have leading and trailing edges shaped to interdigitate with one another. A layer of resilient material is located between the strips and a drum. The resilient material has a hardness of 80 or less on the Shore scale.

Abstract: A four way tilt mechanism maintaining the superstructure of an off-road vehicle generally horizontal while the vehicle is working on uneven terrain is disclosed. The tilt mechanism is very robust and provides independent adjustment of the angle of tilt relative to each of two pivot axes. The tilt mechanism incorporates a spherical bearing mounted on a shaft perpendicular to the longitudinal pivot axis of the tilt mechanism to eliminate end-play in the joint which forms the longitudinal pivot axis. The longitudinal and transverse pivot axes lie in the same plane so that many of the the forces which are transferred from the superstructure of the vehicle through the tilt mechanism to the chassis of the vehicle cannot cause a torque on the components of the tilt mechanism.

Abstract: A log feed roller mechanism has a pair of parallel drive rolls; a plurality of contour-edged bars flexibly mounted at spaced intervals around the outer surfaces of each of the rolls; and, a drive mechanism for drivingly counter-rotating the rolls about their respective longitudinal axes.

Abstract: A power saw having a stationary, tree-supporting platform disc, a rotatable tree cutting disc and drive means for rotating the cutting disc. The saw cutting elements have circular, conical or concave cutting faces with circumferential cutting edges. The cutting elements are removably attached to the saw by means of holders which absorb forces imparted to the cutting elements and transmit the forces to the cutting disc. The holders facilitate rapid replacement of dulled or damaged cutting elements.

Abstract: Apparatus is provided having a series of aligned swinging stops to simplify the operation of cutting unwanted end portions off lumber which moves generally sideways through the apparatus. The swinging stops can be used individually to locate an end of the lumber before cutting the lumber. Also any particular stop can swing out of the path of the lumber if the lumber is engaged against another stop. Each swinging stop has a first portion extending generally downwardly from a pivotal mounting for arcuate movement along a path aligned with the direction of travel of the lumber through the apparatus, and a second portion pivotally connected to the first portion below the pivotal mounting for movement in another arcuate path which is also aligned with the direction of travel of the lumber.