Switch stand

Details Switch stand Switch stand

1990-04-18

1991-10-01

Spar, Robert J.

Railway switches and signals

Switch stands

246218, B61L 506

Patent

active

050526421

ABSTRACT:
A railroad track switch stand includes a support frame having a throw crank operably mounted thereon for reciprocating a connecting rod. A pair of cams are mounted on the throw crank so as to rotate the throw crank on the frame. A throw arm is operably connected to the frame and associated with one cam so as to engage the cam and rotate the throw crank. A second throw arm is associated with the second cam so as to engage the second cam and rotate the throw crank. The throw arms are mounted on the frame so as to be out of engagement with the associated cams, until moved between first and second positions. Each throw arm has a cam-engaging roller which is slidably mounted, so as to engage the associated cam when the throw arm and cam are initially in adjacent positions, and so as to bypass engagement with the cam when the cam and throw arm are initially in opposite positions. The first and second throw arms are independently operable to allow either throw arm to throw the throw crank and thereby throw the associated railroad track switch.

REFERENCES:
patent: 3127138 (1964-03-01), Wilson et al.
patent: 3136509 (1964-06-01), Magnus
patent: 3363097 (1968-01-01), Wilhelm et al.
patent: 3621237 (1971-11-01), Hylen
patent: 3708660 (1973-01-01), Speight
patent: 4022409 (1977-05-01), Ensink et al.

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