Brakes – Operators – Spring
Patent
1990-11-27
1993-02-16
Butler, Douglas C.
Brakes
Operators
Spring
188 723, 188 7332, 188216, 188 729, B60T 1304
Patent
active
051862875
ABSTRACT:
A motor brake mechanism (10) includes retaining structure (46) permitting removal and replacement of friction discs (16, 18) without disassembling the brake mechanism. When the brake mechanism is detached from the motor, removal of a single bolt (46) permits radial removal and replacement of the friction discs. Minimizing of brake drag is enabled by adding low force compression springs (162, 164, 166, 168, 170, 172) without otherwise modifying the structure which prevents rotation of the pressure plates (38, 40) relative to the end plate (28) of the brake mechanism (10), wherein a first set of studs (42, 44, 46) provide both functions of non-rotatably mounting the pressure plates (38, 40) to the end plate (28) and mounting the low force compression springs, all separate from another set of studs (70, 72) mounting the brake lever (68) to the end plate (28). The brake solenoid (104) is mounted on another set of studs (122, 124) by resilient shock absorbers (126, 128, 130, 132) which perform dual functions of absorbing mechanical shock from the solenoid plunger (106) at the end of its travel stroke and minimizing solenoid buzz. The latter function is provided in conjunction with simplified single nut(148, 150) adjustment of the solenoid abutment surface (120). Separate cover mounting studs are eliminated, and the cover (98) is mounted on the same set of studs (70 and 72) which mount the brake lever (68). Improved and simplified pivot bearings are provided by hardened drive pins (64 and 66) providing substantially point contact and facilitating smooth pivotal bearing movement of the brake lever (68). A simplified manual release (182) includes a spacer (206) accommodating two friction discs (16, 18).
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"Stearns Spring-Set Disc Brakes Parts List for 55,000 Series", PTC Sheet 309, Oct. 31,1985, pp. S-607-1, FIGS. H, I, J, K, L.
"Stearns Spring-Set Disc Brakes", Catalog No. 200 68910M, Stearns Division, Rexnord Corporation 1989.
"Stearns Spring-Set Disc Brakes Installation and Service Instructions for Series 48,000" Sheet 300.10A, effective Mar. 21, 1989, p. S-700-1, P/N8-078-924,05, Stearns Division, Rexnord Corporation.
Lindner Bernard J.
Lorenz Harold
Butler Douglas C.
Rexnord Corporation
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