US Patent 7152830 Switch machine improvements
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Patent Inventor Names
Charles David Crawford0
Edward Armand Croteau0
John Patrick Dowell0
Maurizio Biagiotti0
Michael Lee Ashton0
Wallace Martindell Catanach, III0
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Patent abstract
A control mechanism for moving switch points on a railroad track, having a drive screw driven by a motor, a traveling block moving along the drive screw to position the switch points, an end stop on the drive screw for limiting movement of the traveling block, a hand crank for manually turning the drive screw, and a torque limiting clutch on the hand crank.
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US Patent 07152830 Switch machine improvements US Patent 7152830 Switch machine improvements
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Patent Number
07152830
Patent Number
7152830
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Official Website
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US Patent 07152830 Switch machine improvements
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Is a
Patent jurisdiction
Patent number
07152830
Date of patent
December 26, 2006
Patent application number
11005894
Date Filed
December 6, 2004
Patent primary examiner
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