Alliedsignal Inc.

Clyde E Carr

Louis S Rodino

Donald D Johannesen

Orla L Holcomb, Jr

John R Wegh

Rodney R Rodriguez

The drum-in-hat assembly (10) comprises a disc brake (12) mounted slidably relative to a backing plate (18) which includes an opening (19) through which extends a reverse scissors actuator (40) for the drum brake (30) of the assembly (10). The drum brake (30) includes a pair of arcuate drum brake shoes (32, 34) supported relative to the backing plate (18), with the shoes (32, 34) having a pair of opposed brake shoe ends (36, 38) engaged by the actuator (40). The actuator (40) comprises a pair of levers (42, 46) pivotably attached to one another with each lever (42, 46) having a second lever end (48, 58) engaging a respective end (38, 36) of an associated brake shoe, wherein the second lever end (48, 58) has either a slot (49) or an edge (59) located laterally away from the other and engaging the associated brake shoe end (38, 36). The actuator (40) is free to float relative to the backing plate (18), and the levers (42, 46) are located within a housing (70) attached to the backing plate (18).

Drum-in-hat brake with reverse scissors actuator

The mechanically actuated brake (10) comprises a laterally movable sleeve housing (22) which is attached by slots (24) and connections (26) with the support plate (28). A mechanical actuator and adjuster mechanism (40) has parts (42, 48) received within a longitudinal through opening (27) of the housing (22), a first part (42) of the mechanism (40) abutting one brake shoe end (20) while a second part (48) of the mechanism (40) abuts the other brake shoe end (18). A lever (50) for service brake operation is attached pivotably by a connection pin (30) with the housing (22) and extends through a transverse through opening (29) of the housing (22). The lever (50) is received within a slot (49) of the second part (48) of the mechanism (40), and includes an actuating arm (57) which extends through the housing (22) and is engagable with an actuating arm ( 66) of a pawl (60) that actuates the adjuster portion of the mechanism (40). The pin connection (30) also mounts rotatably the pawl (60) to the housing (22). The pawl (60) includes a spring support flap (67) which receives one end of a spring (70) attached to the one brake shoe end (20). A return spring (80) extends between the connection (30) and another brake shoe end (18) in order to effect return of the associated brake shoe (12), to reduce the torque required to rotate a star wheel (44) of the mechanism (40), and to reduce the size of the spring (70) attached to the one brake shoe end (20).

Mechanically actuated brake with automatic adjustment

The parking brake lever cable retainer (90) comprises a wire form spring retainer (90) attached to a parking brake lever (40) in order to couple a cable (50) and cable ball (82) with the end of the lever (40). The lever (40) includes a pair of spaced-apart end feet (44, 45) with a longitudinal recess (46) extending therebetween such that the cable (50) is disposed within the longitudinal recess (46) and extends from one side (41) of the lever (40) to the opposite side (43) where the cable ball (82) is received within complementary-shaped openings (42) in each of the feet (44, 45). The wire form spring retainer (90) comprises a pair of arc-shaped resilient legs (91, 93) extending laterally across the lever (40) from free ends (91A, 93A) exerting opposite forces (D, E) against engagement slots (49) at the opposite side (43) of the lever (40), and at the one side (41) of the lever (40) the legs (91, 93) form a looped, generally circular-shaped portion (98) that engages the cable ball (82) and biass the cable ball (82) into the complementary-shaped openings (42). The cable (50) is free to travel downwardly as it pivots about the cable ball (82).

Parking brake lever cable retainer

The mechanically actuated brake (10) comprises a laterally movable sleeve housing (22) which is attached by way of slots (24) and connections (26) with the support plate (28). A mechanical actuator and adjuster mechanism (40) has parts (42, 48) received within a longitudinal through opening (27) of the housing (22), a first part (42) of the mechanism (40) abutting one brake shoe end (20) while a second part (48) of the mechanism (40) abuts the other brake shoe end (18). A lever (50) for service brake operation is attached pivotably by a connection pin (30) with the housing (22) and extends through a transverse through opening (29) of the housing (22). The lever (50) is received within a slot (49) of the second part (48) of the mechanism (40), and includes an actuating arm (57) which extends through the housing (22) and is engagable with an actuating arm (66) of a pawl (60) that actuates the adjuster portion of the mechanism (40). The pin connection (30) also mounts rotatably the pawl (60) to the housing (22). The pawl (60) includes a spring support flap (67) which receives one end of a spring (70) attached to the one brake shoe end (20).

The mechanically actuated brake (10) with automatic adjustment comprises an integral support plate (20) having first (22) and second (24) axially extending support bars which position associated pairs of brake shoe ends (13, 15, 17, 19). The brake shoe ends (13, 15, 17, 19) are biased together by respective spring mechanisms (16, 18), and the shoes (12, 14) are captured between the support bars (22, 24) and shoe web rests (21). A pawl (60) is attached to one (12) of the brake shoes (12, 14) and is biased by a resilient member (70). The pawl (60) includes a protrusion (66) which slidably engages an axially extending angled ramp surface (25) of the second support bar (24). An end (64) of the pawl (60) engages an adjuster mechanism (50) located between the second pair (17, 19) of brake shoe ends (13, 15, 17, 19). The first pair (13, 15) of brake shoe ends has a mechanical actuator slide (30) disposed therebetween, the mechanical actuator slide (30) providing pivotable support for an actuator lever (40) which engages one (12) of the brake shoes (12, 14).

Growing community of inventors

Galien, MI, United States of America

Clyde E Carr