Two force levels of mechanical braking for materials handling ve

Details Two force levels of mechanical braking for materials handling ve Two force levels of mechanical braking for materials handling ve

1991-09-27

1993-04-27

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303102, 303 93, B60T 858

Patent

active

052056201

ABSTRACT:
A materials handling vehicle employs a two step braking process where full brakes are applied to stop the vehicle quickly when it is traveling at a fast rate, and partial braking force is applied to stop the vehicle smoothly when it is traveling slowly. The amount of the braking force is controlled by the spring force applied to the braking shoes. Whenever the vehicle is moving at or less than a predetermined speed, only the brakes on one pair of wheels, typically the load wheel brakes, that is the brakes on the wheels under the load, will be used when braking action is requested. This will permit the vehicle to stop smoothly, and not abruptly as would be the case if full braking were to be applied. If the vehicle is moving faster than the predetermined speed, then full braking force will be applied by actuating the brakes on both pairs of wheels whenever requested by the operator or by the vehicle control system. Both the load wheel brakes and the steered wheel brakes are conventional spring applied brakes which are released by hydraulic pressure applied to individual brake cylinders.

REFERENCES:
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patent: 3288538 (1966-11-01), Marcellus
patent: 3376079 (1966-04-01), Ryskamp
patent: 3645352 (1972-02-01), Stark et al.
patent: 3761139 (1973-09-01), Rogers
patent: 4093313 (1978-06-01), Burckhardt
patent: 4235320 (1980-11-01), Polak et al.
patent: 4258831 (1981-04-01), Weber
patent: 4778223 (1988-10-01), Inoue

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