Abstract: The invention relates to a drum brake with two shoes, each having a web (16) and a rim (18), of which the face confronting the drum receives a friction lining (20). The drum brake is arranged on a supporting plate (10) and also includes a mechanical control lever (34) comprising a body of considerable length and of small thickness in relation to its width, the body having, at a first end (36), an orifice (38) intended for receiving an articulated connection with the web (16) of one of the shoes (14) at an intermediate point near the orifice, and a notch intended for interacting with a spacer (62) making it possible to subject the shoes (12, 14) to a stress moving them away from one another, and at the second end (40), a fastening point for an actuating cable (54) of the lever. The cable is equipped with a ferrule (60) at its end interacting with the lever.
Abstract: A mechanical brake actuator for a shoe drum brake including a pair of brake shoes carried by a back plate wherein one pair of adjacent ends of the shoes engage an abutment fixed relative to the back plate, comprises an assembly including a pair of pivotally interconnected parts for co-action respectively with the brake shoes, one part being a force-applying lever engaging one shoe and the other part engaging the other shoe and extending therefrom to the lever to form a pivot member pivotally interconnecting the lever and strut, a pair of rollers on the pivot member, an opening in the abutment, and a pair of spaced surfaces on the abutment on opposite sides of the opening, the rollers being in rolling engagement with the spaced surfaces, and the lever and strut being movably disposed in the opening so that force applied the lever in one direction to pivot the lever about the pivot member urges the one shoe into engagement with the drum and urges the strut to displace the other shoe into engagement with the dru
Abstract: A mechanically-operated drum brake device which comprises a pair of brake shoes each coming in contact with an anchor at one end portion on the same side and engaging with a floating type actuator and a brake lever rotatably supported on the actuator at their other end portions, respectively. There is provided structure for holding in place the brake shoes and the actuator relative to a back plate at a predetermined distance therebetween in the axial direction of a brake drum. There is also provided a stop member to control the inward contracting movement of the brake shoes when the brake is released.
Abstract: A shoe drum brake of the type including a pair of shoes, a first having a cylindrical portion, a second strut having external screw thread portion telescopically received in the cylindrical portion, an adjusting nut threadingly engaging with the screw thread portion of the second strut and abutting with the first strut, and an automatic shoe clearance adjusting mechanism associated with a hand brake lever, the mechanism comprises a supporting shaft pivotally connecting the hand brake lever with one end of either of the first and second struts, and an adjust lever for rotating the adjusting nut in association with the movement of the hand brake lever. A spring is provided to bias the automatic shoe clearance adjusting mechanism toward a backing plate.
Abstract: A mounting for a shaft of a tool rotating at high speed comprises a rotatably journaled tube with an axial bore of a diameter exceeding that of the tool shaft. The latter is held in that bore by resilient inserts, such as soft springs or O-rings, whose elasticity coefficient is so chosen that the shaft has a critical speed well below the operating speed of the tool. A locking device, preferably actuated automatically by a speed sensor, consolidates the shaft with the tube until the system surpasses the critical speed.
Abstract: A band brake assembly includes a housing which carries a rotatable member and a band with a friction lining substantially surrounding the rotatable member. A parking brake lever is connected to a parking brake actuator and also to a plurality of links which are connected to respective ends of the band. The parking brake lever engages the housing and pivots relative to the housing to move the links and separate the band ends and contract the band in response to the movement of the parking brake actuator. A pivotal connection joins the links to each other and to the parking brake lever.
Abstract: A band brake assembly includes a band which carries a friction lining for engagement with a rotatable member. A casing surrounds the band and a hydraulic actuator cooperates with a pair of links which are engaged with respective ends of the band. When the hydraulic actuator is operated, the hydraulic actuator is moved toward the rotatable member such that the pair of links are pivoted oppositely about the moving hydraulic actuator. The pivoting links are coupled to the band such that movement of the hydraulic actuator causes the band to contract the friction lining into engagement with the rotatable member. The pair of links are optionally provided with rollers which roll on the casing and the hydraulic actuator when the latter is operated. It is also possible to eliminate the casing so that the rollers roll on the band when the hydraulic actuator is operated.
April 3, 1978
Date of Patent:
April 15, 1980
The Bendix Corporation
Donald D. Johannesen, Orla Lee Holcomb, Jr., Andrew F. Kazmierzak
Abstract: A duo-servo parking brake in which brake shoes are moved into contact with a brake drum on a wheel unit by a four-joint link assembly which is actuated by an actuation cable connecting to a pedal or handle actuable by the driver of a vehicle, and which is so disposed that the actuation cable may be led at a right-angle from the wheel unit and so avoid contact with vehicle suspension elements. Connections of links in the four-link assembly are all rotatory connections, whereby friction and wear of parts are reduced and improved transmission of braking force exerted by the actuation cable is achieved.