Abstract: In a diaphragm fluid pump, a pump housing comprises a cylinder provided therein coaxially with an operating rod of a diaphragm piston assembly hermetically assembled within the housing, and a driving mechanism for the operating rod includes a piston element mounted on the free end of the operating rod and slidably engaged within the cylinder to regulate the axial movement of the operating rod, whereby the diaphragm piston assembly is reciprocated without twisting thereof.

Abstract: A fluid pressure brake unit with a fluid piston actuated wedge that moves a brake push rod in a direction perpendicular to the piston stroke has provided therein a forked wedge astraddle the push rod that engages on opposed wedge surfaces respectively two rollers placed on opposite sides of the push rod and two rollers affixed to the brake unit housing. For hand brake use, a rotatable member has a cam head engaging the push rod assembly to move it independently of the wedge action.

Abstract: An actuator for a spring brake used for parking and emergency has a spring operating on the brake push rod which will apply braking unless fluid pressure in the braking system applied to a piston overcomes spring pressure. To disable the spring brake the rod is retracted by a mechanism coupling the piston to the rod so that the brake is automatically restored into service when the piston is operated by the fluid pressure. The mechanism has a one-way clutch engaging a threaded push rod by means of a nut in non-self-locking engagement on the push rod threads.

Abstract: A pneumatic impact device comprising a housing, a drive piston and a piston rod. At the forward end of the piston rod there is attached a tool intended for metal working like punching, cropping or forging. The housing contains a drive chamber, an air charge chamber, a reverse chamber and a retard chamber. The piston rod is provided with two forward-facing, annular shoulders one of which constitutes a reverse piston for working in the reverse chamber and the other a retard piston for working in the retard chamber. For being protected from impact strains, the drive piston is longitudinally displaceable relative to the piston rod. During the working strokes, the drive piston cooperates with a backwardly facing shoulder on the piston rod, but just before the latter reaches the point where the tool hits the billet to be worked, the drive piston is stopped in the drive chamber and is thereby separated from the piston rod shoulder.

Abstract: This invention relates to a fluid pressure operated disc brake assembly that includes a tandem-arranged spring-applied fluid-pressure-related brake operating unit and an automatic slack adjuster mechanism which is actuated by a pair of springs to so compensate for wear of a disc brake rotor and/or brake shoes therefor that the brake shoes, while the brakes are released, are constantly lightly pressed against the brake rotor notwithstanding prior wear of the shoes and/or the rotor.

Abstract: This is concerned with a crusher clearing system using a plurality of hydraulic jacks disposed with relation to the adjustment ring and main frame of the crusher such that the jacks, as a unit, apply a generally vertical thrust directly between the upper main frame flange and the adjustment ring so that uncrushable material may be removed from the crushing cavity in a stalled or jammed crusher.

Abstract: A lever mechanism having an output end and an input end wherein the input end is pivotally mounted to a fixed support and provided with a track portion. The track portion has a spaced apart relationship to the pivot axis of the lever and is provided with a generally V-shaped portion and lateral side portions oppositely extending therefrom. A reference force is applied through a roller member which is positioned along the track by a variable input position signal applied thereto. The apex of the V-shaped portion is on a line through the pivot axis such that with the roller member held in a bottomed position and engaging both sides of the V-shaped portion there is no input moment applied to the lever mechanism and movement of the roller member in either direction from a null position produces a clockwise or counterclockwise motion of the output end of the lever mechanism, depending upon the direction of movement of the output end in response to the roller movement.

Abstract: There is herein disclosed a lift control system for a press unloader having an extendable and retractable jaw means for gripping and removing a part from the die cavity of a press with pivotal frame means supporting the jaw means for pivotal movement to lift the part from the die cavity and interconnected air operated power cylinder means to sequentially extend the jaw means, grip the part, lift the part, and retract the jaw means.

Abstract: A high pressure positive displacement gradient pump for two flowable materials utilizing two reciprocating pistons with the pair of pistons pumping in an overlapping reasonably pulse free manner. The gradient of the two flowable materials is created by adjustment of the stroke of each piston. Streams for the pair of pistons are combined and mixed in a mixing chamber. A third pair of pistons may deliver the mixed stream at high pressure to the desired location.

Abstract: A motor or processing machine, such as a lowspeed radial piston motor, having a piston with a socket formed therein operatively contacting a ball formed on one end of a piston rod, to form a ball-and-socket joint with articulated movement, and a shoe on the other end of the piston rod, adapted to glide on a rotating element of the machine, such as a crankshaft eccentric, in which the entire piston rod is formed from a bronze-base bearing metal, such as steel bronze. At least the shoe of the piston rod may be coated with a thin, soft run-in layer, such as tin, and a pocket may be formed in the shoe of the piston rod to provide hydrostatic relief.

Abstract: A brake cylinder for vehicles employes a spring plate as a transmission linkage between a piston and a piston rod coaxial with the piston. The spring plate is supported against a portion bearing against the piston rod. The inner end of the spring plate is acted upon by the piston.

Abstract: A fluid operated reciprocatable device has an outer, usually fixed, member nd an inner relatively movable member joined by a resilient member e.g., of rubber. The outer member is closed at one end so as to form an enclosure into which fluid under pressure can be admitted so as to displace the inner member in a given axial direction relative to the outer member. When a pulsating pressure is applied to the fluid the inner member vibrates axially in accordance with the pulses. The resilient member is proportioned so that its dimension in the axial direction is large in comparison with the thickness between the outer and inner members, e.g. 4 times larger. The properties of the resilient member are chosen so that it acts not only as a seal between the outer and inner members to contain fluid, but as a return spring whereby the inner member is returned, between fluid pulses, from an axially displaced position.

Abstract: According to the preferred embodiment of this invention, a cab of a tilt cab truck is mounted on a chassis frame by suspension springs. A hydraulic ram is arranged to move the cab from a riding position to a tilted position. The means connecting the ram to the cab permits free movement of the cab on its suspension springs when the cab is in its riding position and provides a restraint against movement between the ram and cab when the cab is in its tilted position.

Abstract: A push rod and tappet assembly for a cam actuated pump in which a tappet having a barbed shank is lightly press fitted, during assembly, part-way into the hollow end of the push rod so that during the initial operating cycle of the pump, as the cam on which the tappet rides rotates through the first cycle of rotation, the pump piston to which the push rod is connected bottoms out and the shank of the tappet will then be forced further into the push rod to a position to thereafter provide substantially zero clearance in the pump.

Abstract: A vehicle wheel spring brake actuator has a service braking piston and cylinder assembly and an auxiliary parking or emergency braking piston and cylinder assembly, the emergency braking piston being spring biassed towards a brake-applying position and normally held off by an opposing fluid pressure, upon release of which the spring force is transferred through the emergency braking piston and a force transferring member to the service braking piston to apply the brake. A quick release device is movable through a small distance to permit relative movement between the force transferring member to release the applied brake, the release device and the force transferring member extending through the emergency braking piston freely and with clearance.

Abstract: A hydraulic actuator for producing translational movement over a long distance having two jack cylinders with pistons mounted for reciprocal movement and connected to a worm wheel through a worm gear. When a piston is driving, the worm gear acts as a rack to turn the worm wheel and when a piston is being returned to its starting position the worm gear rotates. Means are provided to alternately switch from one cylinder to the other.