Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1996-09-05
1998-05-05
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182 21, B66F 1104
Patent
active
057462860
ABSTRACT:
A platform leveling system for an aerial lift truck utilizes a master/slave combination of helical hydraulic rotary actuators to automatically level the work platform in response to movements of the boom. For a two-stage aerial lift comprised of a lower boom and an upper boom, a first rotary actuator is coupled to the base of the lower boom, a second rotary actuator is coupled to the elbow where the upper boom is hinged to the lower boom, and a third rotary actuator is coupled directly to the platform and upper boom. Movement of the lower boom relative to the base causes the first rotary actuator to displace a fixed amount of hydraulic fluid, and movement of the upper boom relative to the lower boom caused the second rotary actuator to disperse a fixed amount of hydraulic fluid. The displacement of hydraulic fluid in the first and second rotary actuators (the master units) causes an equal amount of displacement in the third rotary actuator (the slave unit), which results in articulating the platform in direct response to movement of the boom in order to maintain the platform in a level position.
REFERENCES:
patent: 3616940 (1971-11-01), Milner
patent: 3844378 (1974-10-01), Balogh
patent: 4775029 (1988-10-01), MacDonald
patent: 4858723 (1989-08-01), Holmes et al.
Helac Corporation, "HB Series Helical Hydraulic Rotary Actuators".
Paul Weyer, Machine Design, "Boosting Performance of Rotary Actuators", Jul. 6, 1989, pp. 50-52 and 54.
Chin-Shue Alvin C.
Mat-3, Inc.
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