Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1989-01-12
1990-08-07
Look, Edward K.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 63, 188170, 188 111, F01B 2526, F01B 3112
Patent
active
049458183
ABSTRACT:
A first visual indicium (44) and a second visual indicium (50) are provided on a push rod (10) in an air operated diaphragm spring brake. The push rod (10) is mounted for reciprocal movement between an operative position and an inoperative position through an opening (26) in a service brake housing (16). The first indicium (44) comprises a discontinuity (45) in the surface of the push rod (10) having a leading edge (46) and grooves (48). The first indicium is positioned on the push rod such that the leading edge (46) will be exterior to the service chamber (12) only when the push rod is in the operative position and the brakes are substantially out of adjustment. The second visual indicium (50) comprises a second discontinuity formed of at least a leading edge (52) and a trailing edge (54). The second visual indicium (50) is positioned on the push rod whereby the trailing edge (54) will normally be exterior of the service chamber 12 adjacent the opening (26) when the push rod is in the inoperative position.
REFERENCES:
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patent: 3388682 (1968-06-01), Whiting
patent: 3431031 (1969-03-01), Ike
patent: 4207565 (1980-06-01), Isakson et al.
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patent: 4583071 (1986-04-01), Sebalos et al.
patent: 4757300 (1988-07-01), Sebalos
patent: 4776438 (1988-10-01), Schandelmeier
patent: 4800991 (1989-01-01), Miller
Denion Thomas
Lear Siegler Truck Products Corporation
Look Edward K.
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