US1094494A - Electric railway. - Google Patents

Description

L. H. THULLEN.

ELECTRIC RAILWAY.

APPLICATION FILED MAY 2p, 1905.

1,094,494, Patented Apr. 28, 1914.

rent o' the track circuit and pole of the source G to points at or near the centers of the said cross bonds.

In Fig. 2 a supplementary return conductor 'F is shown such as is frequently einployecl to carry part of the return propulsion current load which would otherwise be carried entirely by the track rails. This supplementary return conductor may be in the forni of a copper wire or cable laid or strung along the track or it may be an iron or steel structure upon which the track is laid or any other suitable conductor. At L, lf, etc. I have shown my method of connecting this supplementary return track rails so tor with the said rails for the return current, and it will be seen that, as in the case of cross connections between tracks in Fig. 1, I here make my connections to points at or near the centers of the inductive cross bonds c, c, c?, etc. thereby avoiding the danger of short circuit-ing the track rails as regards thc alternating current flowing therein, but at the same time allowing a free path of low ohinic resistanqp for the propulsion current.

As here shown, the alternating si naling current for the track sections is supp ied by an alternating current generatpr 6 which is connected with ing along the trackway. At cach ji'inction of adjacent sectionsl l provide a transformer 7 the primary of which is connected with I connect the the signaling mains and the secondary with; As shown 1n the rails of a track section. Fig. l., each ot' these transformers comprises two sccondaries one of which is connected with the rails of a section of track T and the other of which is connected with the rails of a section of track T1. In Fig. 2 each transformer comprises only one secondary for the reason that only one track is here shown. `Each track section is also provided with a suitable relay 8 which is responsive to the alternating signaling current. llach relay controls a railway signal 9 tor the corresponding track section by means of a local circuit in the usual and well known manner.

Cl a im 1, An electric railway having two or more tracks and in which both rails of cach track are used as a return for the propulsion current. in combination with cross bonds having a high impedance to a signaling current and a low ohmic resistance to a propulsion current. and means for electrically connecting tho cross bonds ot' one track to the cross bonds of one or more adjacent tracks.

Q. An electric railway having two or more tracks and in which one or both rails of each track arc. used as a return for "ie propulsion cui-rent. in combination with rail bonds having high impedance to a signaling current signaling mains 5 Yextendg and low ohmic resistance to a propulsion current, and means for electrically connecting the rail bonds of one track to the rail bonds of one or more adjacent tracks.

3. In combination, an electric railway having two or more tracks, a plurality of block sections for each track, track circuits for the block sections, a source of propulsion current and a source o signaling current, inductive bonds cunnccted across the rails of each block adjacent the ends thereof and having high impedancil for signaling current an( low impedance for propulsion current, an electric connection from one bond to the adjacent bond, and an electric connection from a pair of bonds on one track to a pair of bonds on an adjacent track.

4. In an electric railway two or more tracks, a plurality of inductive cross bonds for each track, each cross bond connectin one rail of its track to the opposite rail, an a -plurality of electric bonds connecting one or more cross bonds of one track to one or more. cross bonds on each of the other tracks of the railway.

5. In an electric railway, a source of propulsion current, an inductive cross bond having high impedance to a signaling current and low ohmic resistance to a propulsion current connecting the rails on one side of ductor of the propulsion current.

6. In a signaling system of the type described, a plurality of pairs of parallel lines of rails included in the circuit of the propulsion current, means for cross-connecting said parallel lines of rails, said means comprising a conductor connected to one rail of each pair of rails and a conductor connected to one rail of cach pair of rails through reactance bonds. i

In a signaling system of the type described, a plurality of pairs of parallel lines of rails included in the circuit of the propulsion current, means for cross-connecting said parallel lines of rails, said means comprising a conductor connected to one rail of each pair of rails and a conductor connected to one rail of cach pair of rails through devices which will obstruct the flow of an alternating current.

8. In combination, an electric railway having two or more tracks the rails of which arc included in the circuit for the propulsion current, an inductive bond for each track connected across the rails of the track, and a conductor connectingr substantially the middle point of the winding of the bond for one track with substantially they middle point of the winding of the bond for another l track.

9. In combination, having n plurality of xsections for each track .ormed by insulations in hath lines of rails, inductive bonds connected across the rails of each block adjacent the ends of the block, a, conductor conncctin substantially the middle oint of each bong with substantially the nnddle point cf the adjacent bond for the adjacent block section, l

an electric railwav arallel tracks, block and an electrical connection between a conductor for one track and a smnlar conductor for another track.

In testimony whereof I have signed my 16 name to this specification in the presence of two subscribed witnesses.

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