Brakes – Wheel – One-way brakes
Patent
1990-11-05
1992-08-25
Oberleitner, Robert J.
Brakes
Wheel
One-way brakes
188187, 188 823, 188 711, 188 727, 188 727, 192 7, 192 8A, 254344, 254347, 254903, F16D 6300
Patent
active
051410850
ABSTRACT:
The invention involves a hoist for raising and lower loads. The hoist includes a drive motor, gearing, a load brake and a cable-winding drum. The drum has an end with a splined annular member slidably engaging a similar splined annular member of a drum-concentric friction plate. The friction plate directly drives the drum during load raising and directly brakes the drum during load lowering. Because of the direct mechanical coupling between the drum and the friction plate, a failure in the gearing does not impair the ability of the friction plate to brake the load. Further details of the invention are set forth in the specification.
REFERENCES:
patent: 2053055 (1936-09-01), Wadd
patent: 2263064 (1941-11-01), Allin
patent: 3049340, Magnuson
patent: 4118013 (1978-10-01), Christison et al.
patent: 4227680 (1980-10-01), Hrescak
Harnischfeger Corp., "Beta Hevilift", 2-9.
Harter, "Mechanical Load Brakes", Sep. 13, 1965, pp. 140-143.
Harnischfeger Corp. drawing, "Load Brake Shaft Assembly", Apr. 4, 1978.
Harnischfeger Corporation
Oberleitner Robert J.
Poon Peter M.
Ruppin Richard C.
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