Railway switches and signals – Switches – Snow protected
Patent
1990-04-23
1991-05-28
Spar, Robert J.
Railway switches and signals
Switches
Snow protected
292113, E01B 720, E01F 700
Patent
active
050186906
ABSTRACT:
A latch mechanism to secure a switch cover panel to a railroad track switch to cover the switch to avoid accumulations of ice and snow that would impede operation of the switch. An anchor bar is positioned beneath the housing of the cover panel. A linkage has a hook at a lower end that engages the anchor bar. The upper end of the linkage is connected to an over-center cam mechanism. A cam member is pivotally connected to a hinge plate secured to the upper surface of the switch cover panel housing. The upper end of the linkage is eccentrically connected to the cam member. A lever rotates the cam member on the hinge plate. Rotation of the cam member moves the upper end of the linkage from a relatively low position to a relatively elevated position to lift the hook for engagement with the anchor bar. Opposite rotation of the cam member releases the hook from the anchor bar. In the release position, the linkage can be rotated to a position out of latching alignment with the anchor bar whereby the switch cover panel can be moved away from the railroad track for purposes of access to the track rail.
REFERENCES:
patent: 983982 (1911-02-01), Davis
patent: 994486 (1911-06-01), Svenson
patent: 1153166 (1915-09-01), Knowles
patent: 1325977 (1919-12-01), Boardman
patent: 1390182 (1921-09-01), Ware
patent: 1661040 (1928-02-01), Gervasio
patent: 1758519 (1929-10-01), Janville
patent: 1931850 (1933-10-01), Moore
patent: 2966706 (1961-01-01), Christensen
patent: 3312820 (1967-04-01), Watkins
patent: 3806174 (1974-04-01), Herman
patent: 4671475 (1987-06-01), Widmer
Lowe Scott L.
Spar Robert J.
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