Brakes – Operators – Spring
Patent
1974-05-22
1976-07-06
Blix, Trygve M.
Brakes
Operators
Spring
188264A, 192 3N, F16D 6524
Patent
active
039677060
ABSTRACT:
A material handling device, such as a crawler type crane-excavator, is provided with a fail-safe brake having a piston which is normally spring biased into brake engaging position and which is moved to brake release position by a positive control. A port in the piston end of the brake housing is connected to an external source of pressurized air. A passage through the piston rod permits flow of this air to the opposite piston side, thereby equalizing the air forces thereon. The air intimately contacts the brake elements and biasing springs and is discharged from adjacent the springs to the outside through a one-way exhaust valve. When maximum purging is desired, the air discharge is disposed in the lowermost portion of the brake housing. In addition, the pressurized air may be conditioned and also provided with a lubricant or the like therein to help maintain proper brake functioning and reduce the possibility of corrosion of the brake parts. The pressurized air supply is contemplated as being responsive to release of the brake.
REFERENCES:
patent: 2356111 (1944-08-01), Weaks et al.
patent: 2487415 (1949-11-01), Bennett
patent: 2584191 (1952-02-01), Danly et al.
patent: 2821437 (1958-01-01), Lesher
patent: 2866525 (1958-12-01), Bauer
patent: 3334711 (1967-08-01), Anderson
patent: 3335823 (1967-08-01), Nagel
patent: 3366211 (1968-01-01), May
patent: 3536230 (1970-10-01), Williams
patent: 3773152 (1973-11-01), Sitton
Blix Trygve M.
Kazenske Edward R.
Northwest Engineering Company
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