Norman R Hostetler

US Patent:

62061488, Mar 27, 2001

Filed:

Jan 29, 1999

Appl. No.:

9/239183

Inventors:

Joseph Carl Capek - Granger IN
Norman Lee Hostetler - Walkerton IN

Assignee:

Robert Bosch Corporation

International Classification:

F16D51/00

US Classification:

188 7951

Abstract:

A drum brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16). The first (12) and second (14) brake shoes have a first end (22,24) aligned on a hydraulic actuator assembly (26) and a second end (28,30) aligned on an anchor block (40). An adjustable strut mechanism (32) has an extendable shaft (33) with first end member (34) which engages the first brake shoe (12) and a second end member (36) which engages the second brake shoe (14). The first end member (34) is separated from the second end member (36) by a stem member (35). Stem member (35) has a threaded first end (39) which is mated with the second end member (36) and a smooth second end (31) which is retained in a bore of the first end member (34). The first (12) and second (14) brake shoes are urged toward the hydraulic actuator assembly (26) by a first resilient member (150) and toward the anchor block (40) by a second resilient member (48). The length of the extendable shaft (33) is adjusted by ratcheting a pawl (65) to rotate stem member (35) and establish a predetermined running clearance between the first (42) and second (44) friction pads and drum (46).

US Patent:

59572477, Sep 28, 1999

Filed:

Dec 12, 1997

Appl. No.:

8/989494

Inventors:

Daniel Ray Zylstra - Niles MI
Norman Lee Hostetler - Walkerton IN

Assignee:

Robert Bosch Technology Corp - Broadview IL

International Classification:

F16D 5100

US Classification:

188 78

Abstract:

A drum-in-hat brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16) by first (18) and second (20) pins connected to the backing plate (16). The first (12) and second (14) brake shoes are aligned on the backing plate (16) by an anchor post (40) and connected to a reverse actuator (26). The reverse actuator (26) receives an input force to respectively move first (42) and second (44) friction pads associated with the first (12) and second (14) brake shoes into engagement with a drum (46) to effect a brake application. The reverse actuator (26) includes a first lever (52) and a second lever (54), each of which have a flat plate (60,76) that extends through an opening (62) in the backing plate (16). A resilient member (90) located in the opening (62) maintains the flat plates (60,76) in a same perpendicular plane with respect to the backing plate (16). The first (52) and second (54) levers which are connected to the first (12) and second (14) brake shoes and to each other through a semi-circular indentation (70) on the first lever (52) adjacent a first end (56) which receives a semi-circular projection (82) extending from a first end (72) on the second lever (54).