Stretching brake shoe return springs

Details Stretching brake shoe return springs Stretching brake shoe return springs

1992-08-31

1996-04-16

Oberleitner, Robert J.

Metal working

Means to assemble or disassemble

Spring applier or remover

29267, B23P 1904

Patent

active

055070833

ABSTRACT:
A generally straight elongated lever tool is insertable through the notch between the ribs in the end of a heavy duty truck brake shoe. A notch in the end of the tool engages the wire between the coils of the return spring when the tool is inserted between the shoe ribs at the end of the shoe. The tool is fulcrummed about the end of the brake actuating S-cam or roller for stretching the spring. One side of the notched end of the tool is concave or cupped to contact one of the spring coils for direct axial lift or stretch to cause the spring end hook to snap over an anchor pin up installation. The opposite side of the notched end of the tool surface is inclined for spring removal such that upon reversed insertion of the tool with the inclined surface against the spring coil and fulcrumming about the S-cam or roller, the coil is deflected laterally upon stretching of the spring to cause the end hook to clear the anchor pin upon relaxation of the spring.

REFERENCES:
patent: 2489434 (1949-11-01), Riccio
patent: 2811772 (1957-11-01), Johnson
patent: 4063342 (1977-12-01), Mitchell et al.
patent: 5003680 (1991-04-01), Vesely et al.
patent: 5095603 (1992-03-01), Carruthers et al.
patent: 5165154 (1992-11-01), Miller

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