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Publication numberUS401472 A
Publication typeGrant
Publication dateApr 16, 1889
Publication numberUS 401472 A, US 401472A, US-A-401472, US401472 A, US401472A
InventorsTheodore Taylor
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric railway-track alarm
US 401472 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


ELECTRIC RAILWAY TRACK ALARM. No. 401,472. Patented Apr. 16, 1889.





SPECIFICATION forming part of Letters Patent No. 401,472, dated April 16, 1889.

Application filed October 8, 1888. Serial No, 287,501. (No model.)

To all whom it may concern.-

Be it known that I, THEODORE TAYLOR, of Cedarville, in the county of idodoc and State of California, have invented a new and Improved Electric Railway- Track Alarm, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a perspective View of my improved electric railway-track alarm, and Fig. 2 is a detail side elevation of one of the hooks for fastening the conductors to the rails.

Similar letters of reference indicate correspondin g parts in both views.

The object of my invention is to provide a simple and efficient alarm for use in connection with railway-tracks for indicating when the track is broken or displaced.

My invention consists in the combination, with the railway-rails, of conductors connected with the rails by suitable fastenings insulated and arranged to form a complete electric circuit, including a battery and an alarm device, all as hereinafter more fully described.

To the track-rails A A are attached the insulated conductors B B by means of the hookbolts 0. (Shown in detail in Fig. 2.) The conductors B B are made in sections, so that they may be easily applied to the rails, or re moved therefrom when necessary, and each conductor is provided with an insulating coating, a, of rubber or other suitable insulating material. The conductors B B are connected together at a distantpoint, b. The conductor 13 is connected with one pole of a battery, D, by means of the wire c. The conductor 13 is connected with the magnet d of the alarm apparatus by means of the wire 6, and the said magnet (Z is in electrical communication with the remaining pole of the battery D.

The alarm apparatus consists of a drum, f, with a cord, g, wound around it and carrying a weight, h, a scape-wheel, 'i, pallets j, working in the scape-wheel, a bell-hammer, it, operated by the pallets and adapted to strike the bell Z. Upon the shaft of the drum f is secured a ratchet-wheel, m,which ispreven ted fromturning by the pawl n. The pawl it carries the armature 0, and a spring, 19, connected with the pawl 11-, tends to draw the said pawl out of engagement with the ratchet-wheel m. So long as the circuit of the conductors B B is (30111- plete the electro-magnet dis energized, the armature 0 is drawn down, and the pawl 91 is kept in engagement with the ratchet m; but when the conductor B or B is broken the armature 0 is released and the spring 19 pulls up the pawl 01-, allowing the weight h to fall and give the alarm through the action of the scape wheel, pallets, and bell-hammer.

By means of my improvement any break in the rail will be instantly detected. Any means of generating an electric current may be employed, either battery or dynamo, as may be most convenient.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with the railroad-rails A A, the alarm apparatus, and an electric generator, of the insulated electric conductor B B, extending alongside and between the rails, and the hooks G, which pass through said rails and secure the conductors to the side thereof, all as shown and described.


i II' I. II A

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6271754Jul 1, 1999Aug 7, 2001Microlynx Systems, Ltd.Method and system for detecting intrusions into a particular region
Cooperative ClassificationB61L23/041