Abstract: A machine for grinding the depth gauges of saw chain cutter links includes a saw chain carrier mounted for movement toward and away from a power grinding element. As the carrier moves a cutter link toward the grinding element, the cutter tooth of such link moves beneath indexing structure which includes a shield plate which then moves with the carrier toward the grinding element. Upon continued movement, the shield plate contacts an indexing roller which forces the plate down against the top of the tooth. After the plate bottoms against the tooth, the plate forces the indexing roller upwardly. The roller, being linked to the grinding element, lifts the grinding element to its grinding position for grinding the depth gauge of such link. An alternative embodiment includes a brake activated by the carrier to hold the grinding element in its grinding position after the cutter tooth passes beneath the indexing roller.

Abstract: A hydraulic safety hose apparatus is disclosed, which includes a pressurized fluid source for producing hydraulic fluid pressure in the apparatus, a hydraulic safety hose, and a hydraulic pump. The hydraulic safety hose is composed of inner and outer hoses with an annular passage between them to receive pressurized fluid in the event of rupture of the primary inner hose. A series of bleed holes in the outer hose allows the escaping fluid to harmlessly dissipate under low pressure without endangering the operator and other persons in the vicinity of the hydraulic system.

Abstract: A saw chain grinding machine has a disc-shaped grinding wheel mounted for rotation in a fixed position on the base of a grinding machine. A saw chain holder is mounted at one end of a support arm extending across and beneath the wheel, with the opposite end of the support arm being mounted on the base for swinging movement about a pivot axis parallel to the axis of rotation of the grinding wheel. Swinging movement of the support arm causes a corresponding swinging movement of the saw chain holder along the periphery of the wheel. A stop fixed to the machine base limits swinging movement of the support arm in one direction to determine a grinding position for the saw chain holder along the periphery of the wheel. The support arm is adjustable lengthwise for moving the holder and thus a saw chain cutter element toward and away from the wheel in a line extending generally toward the axis of rotation of the wheel when the arm is in grinding position against its stop.