Abstract: Designed primarily for use in the production of heavy and medium oil in conjunction with a screw-type pump in relatively shallow or medium wells, the device comprises an inner mandrel within an outer casing situated below the pump and connected to the pump casing and prevents right-hand rotation in the event that the torque reaction of the pump increases due to sand, for example, and attempts to rotate the pump stator together with the production string tubing, but at the same time allows vertical movement of the string to take place for withdrawal purposes.

Abstract: A tandem parking brake caliper system for use with the rotor of a disc brake of a wheel of an automotive vehicle. The system includes a caliper adapted to be slidably mounted in a boss of an anchor extension mounted to a non-rotating portion of the vehicle. The caliper surrounds a radially outer peripheral portion of the rotor on opposite sides thereof. Frictional brake linings are mounted on the caliper surfaces which face the rotor. A movable piston is mounted in a bore of the caliper for engaging one of the linings for forcing the linings into engagement with the rotor upon the application of force onto the piston and the resulting translation of the caliper. An actuating lever is rotatably mounted to the assembly and includes a cam surface for engaging and applying translating force to a cam follower surface of the piston. The lever is connected to a cable actuating the lever.

Abstract: An air disc brake assembly having a shortened end cap and an integral air chamber bracket is provided. The shortened end cap is bolted to an end of the air cylinder which is opposite the end from which the piston extends. An air cylinder support portion is integral with the end cap and extends from the outer surface. This support portion has a plate with a recessed central portion and two end lobes for receiving air cylinder mounting bolts. A supporting web extends between the angular flange and the outer wall of the end cap to support the air cylinder. The end cap has stepped cylindrical surfaces to receive bearings and a fluted plan form.

Abstract: A brake lever is splined to an actuator shaft. A first face cam is splined to the actuator shaft and a second face cam is splined to a housing. Each face cam has plural opposed circumferentially spaced cam grooves. Rollers are positioned in the grooves. As the shaft is turned, rollers ride up the grooves in the opposite cams forcing the cams apart. The first cam is supported against axial movement in the housing by roller thrust bearings. The second cam slides along its splines pushing a piston against the force of a return spring to actuate the brake.

Abstract: A brake actuator shaft has a clutch on an inner end which drives a splined sleeve. The splined sleeve engages an inner projection to turn one piston part on another piston part and to effectively lengthen the piston part. When the shaft is turned by a brake lever, it operates an actuator which presses on the piston part and inward projection and which prevents further relative rotation of the piston parts, causing the clutch to slip. A gear on an outer surface of the rotating portion of the piston engages a pinion connected to a manual adjuster. A ratchet in the manual adjuster prevents rotation of the pinion and the gear in the piston shortening direction.

Abstract: Brake shoes for a disc brake assembly are held radially inward against ledge areas in a caliper and its support plate by plates bolted to the caliper. The plates extend axially and include first bolt receiving lateral portions and second brake shoe hold down portions which are angularly related. The angle is greater than a corresponding angle between the outer surfaces of the brake shoes and the bolt receiving surface in the caliper so that the brake shoes are pressed downward against the ledge as the bolts are tightened. One retention plate has an additional angularly related portion which urges the brake shoes in the direction of normal rotation of the disc.

Abstract: A cylindrical seal for mounting pins for disc brake calipers has two parts. The first part is an elastomeric seal with a central accordian portion and radially extending end flanges. The second portion is a helical spring made of flat wire coiled in telescoping sliding convolutions which hold flanges on the inner element against radial surfaces and which protect the inner element from heat and debris.

Abstract: A slack adjuster is for a disc brake of the type which includes a disc mounted for rotation about an axle and a caliper brake having a housing mounted on the axle in alignment with a friction surface of the disc. A braking piston is mounted in the housing for axial movement toward and away from the friction surface of the disc. Brake actuation produces rotating movement of a powershaft mounted in the housing which will in turn produce a corresponding axial movement of the braking piston through a non-rotating powershaft nut. An adjusting sleeve is between the piston and the powershaft nut and is threadably coupled to the piston and capable of rotation relative thereto to adjust the axial position of the piston. The adjusting sleeve is capable of rotating in a direction which will cause the piston to be adjusted toward the disc and is prevented from rotating in the opposite direction by a one-way clutch shaft between the adjusting sleeve and the housing.

Abstract: An improved connecting rod and piston device are provided for a brake slack adjuster. The connecting rod is formed of steel rod material having its opposite ends bent perpendicular to an elongated intermediate section. The first end is received within brake actuation linkage and the second end is received within a radial bore formed in the piston device to be entrapped therein when the piston device is installed in the brake slack adjuster.