Step-platform operation

Details Step-platform operation Step-platform operation

1979-09-26

1981-06-30

Reese, Randolph A.

Railway rolling stock

Platforms

Trapdoors

105426, 105432, 105435, 105447, 105450, 280166, B61D 2302

Patent

active

042756642

ABSTRACT:
A step-platform operator 17 for transit vehicles for driving a step 19 and a platform 18 between open and closed positions, includes a reversible drive motor 42 driving the step and platform through a lever and linkage for providing differential motion between step and platform during the last portion of the closing cycle and the initial portion of the opening cycle and allowing a mechanical interlock between step and platform in fully closed position. Both platform and step are driven from a single drive unit. Additionally, the lever and linkage assembly utilizes the weights of the platform and the step to counterbalance each other and allow the use of a low power reversible drive motor to power the system.

REFERENCES:
patent: 1141064 (1915-05-01), Kunzelman
patent: 1183707 (1916-05-01), Winegarden
patent: 1419992 (1922-06-01), Szczurek
patent: 1425149 (1922-08-01), Swanson et al.
patent: 2162964 (1939-06-01), Nichols
patent: 2220035 (1940-10-01), Brack
patent: 3724396 (1973-04-01), Roth
patent: 3795205 (1974-03-01), Gritchen et al.
patent: 3913497 (1975-10-01), Maroshick
patent: 3955827 (1976-05-01), Wonigar
patent: 3957284 (1976-05-01), Wright

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