Abstract: A reciprocating impact tool such as a rammer or a breaker is provided with a lubricating oil supply system that supplies lubricating oil to a fuel supply line of the tool's two-cycle engine, thereby eliminating the need to premix the fuel and oil. The oil is supplied at a rate that varies with the speed of the reciprocating member of the tool, thereby assuring that the fuel and oil are mixed in the proper proportions. The oil pump delivers oil to the fuel supply line well-upstream of the engine's carburetor or other fuel supply device, thereby taking advantage of movement and vibration of the reciprocating member to assure that the delivered oil is thoroughly mixed with the fuel in the fuel line before the mixture is inducted into the engine's combustion chamber, leading to complete atomization of the oil and resultant benefits, including improved lubrication and complete combustion of the oil.

Abstract: A spring applied, hydraulically released (SAHR) parking and emergency brake system 1) can be manually overridden to permit towing or assisted vehicle transport when charge pump pressure is unavailable for the brakes, and 2) is reset either a) automatically when charge pump pressure becomes available or b) manually. Override is made possible by a manual override assembly that includes a manually-actuated hand pump and an override valve. The override valve is manually actuated to isolate the brake release actuators and the outlet of the hand pump from the system's reservoir and is reset to its open position in response to the presence of hydraulic pressure at a designated location of the braking system. Automatic reset of the override valve preferably is effected by the supply of pressurized fluid to a previously-unpressurized port of the override valve. The hand pump, override valve, and any other brake control valve(s) of the braking system preferably are incorporated into a single control module.

Abstract: A parking brake assembly positively engages the drive gear or another component of a wheel drive train and thus cannot slip. Accordingly, the brake assembly can be smaller in size, is less expensive to construct and install, and requires lower release pressures than are required for friction brake assemblies of comparable capacity. When used with industrial vehicles powered via an axle-mounted drive gear, the brake assembly preferably includes a pinion which meshes with the drive gear and a piston on which the pinion is supported. The piston (1) is spring applied towards a first position in which the piston and thus the shaft and the drive gear are mechanically locked from rotation and (2) can be pressure-driven to a second position permitting free rotation of the piston, pinion, and drive gear.

Abstract: A start circuit including: a current source; a start switch connected to the current source; a starter relay connected to the start switch; an anti-restart module connected to the starter relay, the anti-restart module including: a bi-directional thyristor having a gate, a first terminal connected to the starter relay and a second terminal connected to a ground; and a diode having a cathode and an anode, the anode being connected to the gate so as to allow current flow from the gate through the anode to the cathode; and a normally closed switch connected between the cathode and the ground, the normally closed switch becoming open upon detecting an engine run condition.

Abstract: A centrifugal vibratory exciter of this invention has a tubular rotatable exciter shaft on which a centrifugal mass is eccentrically fixed and in which a control shaft is axially slideably adjustable. Surrounding the exciter shaft, rotatable but not axially slideable relative to it, is a tubular counterweight carrier on which a counterweight mass is eccentrically fixed. A transverse pin carried by the control shaft projects through a slot in the exciter shaft that is elongated lengthwise of it and into a helical groove in the counterweight carrier, to translate axial adjustment of the control shaft into rotation of the counterweight carrier about the exciter shaft but to constrain the counterweight carrier to rotate with the exciter shaft in any position of axial adjustment of the control shaft.