Invention Grant
- Patent Title: Railroad switch indicator with distance amplifier
- Patent Title (中): 铁路开关指示器带距离放大器
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Application No.: US12843011Application Date: 2010-07-24
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Publication No.: US08695928B1Publication Date: 2014-04-15
- Inventor: David A. Schalk
- Applicant: David A. Schalk
- Agent Grace J. Fishel
- Main IPC: B61L5/12
- IPC: B61L5/12

Abstract:
A railroad switch indicator for visually signaling the position of a pair of railroad switchpoints independently of the mechanism for operating the switch. The indicator includes a sleeve with windows in which is reciprocated a slide with reflectors selected ones of which are visible through the windows of the sleeve for indicating safety conditions of the track. An arm with an upwardly extending finder is attached to a transverse bar that moves the switchpoints. The finger engages the slide through lever arms. When the finger moves with the switchpoints, the lever arms move the slide a distance greater than the distance moved by the finger thereby increasing the sensitivity of the railroad switch indicator to movement of the switchpoints. Movement of the slide by the finger is resisted by springs or counterweights which urge the slide into a mid or default position signaling caution.
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