All weather switch for railroads
AssigneeCanadian Patents and Development Limited
InventorsLawrence A. J. van Eyken, Semion Perlin
Life of this patent
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Abstract
An improved railroad stub switch is described in which the axial rail tension or compression forces due to temperature fluctuations are transmitted through the switch by means of radius arms connected to both the switch and fixed rails, thereby eliminating the need for expensive expansion joints at the switch. In a preferred embodiment, interlocking point shoes are also employed so as to hold the butt ends in vertical and horizontal register and transmit a signal to the trailing side rail of the impending approach of a load from the approach side rail, thereby reducing batter on the trailing side rail.
Claims7
A stub switch construction comprising:
- (a) a pair of fixed longitudinally extending parallel, spaced straight through rails;
- (b) a pair of fixed longitudinally extending parallel spaced turnout rails;
- (c) a pair of longitudinally extending parallel spaced switch rails movable at one end thereof between a first position in axial alignment with said longitudinally extending straight through rails and a second position in axial alignment with said longitudinally extending turn out rails;
- and
- (d) a pair of radius arms extending, on opposed sides of each of said switch rails, from a selected attachment point thereon to a selected attachment point on opposed sides of said straight through and turnout rails respectively, to thereby transmit axial rail tension and compression forces through said switch.
Dependencies are inferred from the claim text.