Patent ID: 7011194
Filing Date: 2006-03-14
Classification: F16D

Abstract:
1. In a drum-in-hat park brake assembly for a vehicle having a first brake shoe and a second brake shoe that are respectively retained on a backing plate that is secured to the vehicle, said first brake shoe having a first web with a first engagement end and a second engagement end, said second brake shoe having a second web with a first engagement end and a second engagement end, said first engagement end of each of said first and second webs being aligned with an actuator assembly while said second engagement end of each of said first and second webs is spaced apart by an adjuster mechanism, spring means attached to said first and second webs for urging said first and second webs toward an anchor, the actuator assembly and said adjuster mechanism, said adjuster mechanism including a yieldable member for reducing the space between the second engagement end of each of said first and second webs to limit the braking force to a predetermined maximum, said adjuster mechanism being characterized by a threaded inter-engaged adjuster screw and adjustment nut, a sleeve for receiving in a first end of a limited portion of said adjuster screw, said limited portion of said adjuster screw being determined by said adjustment nut, a plunger having a limited portion received in a second end of said sleeve, a first flange on said second end of said sleeve, a second flange on said plunger that is located intermediate of first and second ends thereof and a yieldable member comprising a load limiting compression spring captive between said sleeve flange and said plunger flange, said limited portion of the plunger being located in said sleeve and acting to define a separation between said sleeve and plunger flanges with said separation being controlled by the degree of compression of the compression spring.