US367901A - James p - Google Patents

Description

(No Model.)

J. P. FREEMAN. ARRESTER FOR ELECTRIC CURRENTS.

Patented'Aug. 9, 1887.

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To all whom, it may concern:

UNITED STATES PATENT OFFICE.

JAMES P. FREEMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO SAMUEL M. BRYAN, OF WVASHINGTON, DISTRICT OF COLUMBIA.

ARRESTER FOR ELECTRIC CURRENTS.

SPECIFICATION forming part of Letters Patent No. 367,901, dated August 9, 1887.

Application filed January 6, 1857. Serial No. 223,589. (No model.)

of the telephone-wire; but should this condition be disturbed by an excessive current upon the main line 3 10, the bobbin becomes magnetized and the pivoted armature 6 is attracted toward the edge ofthe head 2, breaking the circuit through the bracket 9, but making another circuit by contact with the block 7, through said block and conductor 8, to the ground.

The device thus constructed is wholly automatic in its action, and it results in an instant ground connection upon the main line being unduly charged, and an immediate breaking of the ground connection as soon as the main line is relieved of its excessive current, while when the parts are in their normal condition there is no undue resistance upon the main line. Vhere there is danger of the main line 310 being brought in contact with the conductors of electric-lighting systems,it is desirable to prevent the passage of a current from said conductors through the elcctro-magnet A in case ol'such contact. For this purpose I modify the contacts with the movable armature, so as to short-circuit said current and prevent such a constant flow.

The modified construction for this purpose is illustrated in Fig. 2, in which the bracket 13, of conducting material, connected to, but insulated from, the bracket 9, carries set-screw 15, making contact with an arm, 16, constituting a prolongation of the armature 6 on the opposite side of the pivot. In this case the main-line wire 3 is electrically connected with the bracket 13 and with one end of the spool- Be it known that I, J AMES 1 FREEMAN, a citizen of the United States, and a'resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Arresters for Electric Currents, of which the following is a specification.

My invention relates to that class of electriceurrent-arresting devices intended to relieve the main line of the effects of being suddenly overcharged with a heavy current, and to prcvent the injurious results of conducting such currents along a line not adapted to carry them; and my invention consists in a device constructed and arranged substantially as set forth hereinafter.

In the accompanying drawings, Figure 1 is a perspective view illustrating my improved device for arresting electric currents. Fig. 2 is a perspective view illustrating a 1nodification. Fig. 3 is a longitudinal cross section of the same.

An eleclromagnet, A, consists of a bobbin. of magnetic material, having heads 2 4, around which bobbin is coiled an insulated wire connected at one end to the section 3 of the main line and at the opposite end to the head 4, in electrical contact with a bracket, 5, preferably forming a part of said head, within which is pivoted an arm, 6, constituting a movable armature. The head 20f the bobbin carries an insulated block, 7, which extends below said head and is connected by a conductor, 8,with the ground, and extending in front of said head 2,and insulated therefrom, is a bracket,9,with which is connected the other section,10,of the main or telephone line, and which has an arm extending beneath the free end of the arm 6, and provided with a set-screw, 12, upon which the arm 6 rests when at the limit of its lowest motion. An insulated and perforated bracket, 13, is connected with the head 4 of the bobbin, and'serves as a means of seeu ring the'lightni ugarrester to any suitable support, with the pivoted armature (S in a horizontal position below the bobbin. So long as the line is in its nor mal condition there is a continuous electrical circuit from the section 3, the bobbin-wire metallic head 4, bracket 5, armature 6, setscrew 12, and bracket 9 to the other section,10,

connected with the metallic head and bracket 5, the other connections being the same as in the first instance. \Vhen the resisting device, constructed as shown in Fig. 2, is in its normal condition, the circuit is through the line-wire 3, electro-niagnet, armature 6, set-screw 12,and line-wire 10; but when the bobbin is magnetized and the armature is drawn against the block 7 and set-screw 15, breaking contact with set-screw 12, the main-line current, instead of going to ground through the armature 6, block 7, and conductor 8, is short-circuited through the bracket 13, set-screw 15, and armature 6 to the block 7, so that the bobbin and coil are practically cut out of the line during the time wire at 00, the opposite end of said wire being of the passage of the excessive current, howover long the same may last.

By making the bobbin magneticand including it in the linecircuit I produce a verysimple, cheap, and collective arrangement that is delicate in operation and not liable to get out oforder. 'llhebobbinbeing n'lagnetic, there is no necessity of a separate core, and the wire of the coil being wound immediately upon the bobbin the full magnetic effect of the currents passing through the coil is obtained, so that the device is operative under comparatively slight changes in the current, and by connecting the armature directly to the n'iagnetic bobbin the construction is simplified and the device mad e com pact.

The arrangementofthe above-described parts may be varied according to circumstances, the term of the electro-magnet being altered and the contacts differently arranged, without dcparting from the main feature oi'myinvention, whereby the eleetn'o-magnet is magnetized by the extra current to attract a movable armature, and thereby automatically change theline of conduction.

The above-desc'ribed device is adapted for use upon any lines liable to be overcharged, but is especially applicable in connection with telephone-lines and with systems in which underground cables are employed and in lines which are liable to contact with heavilyeharged electrie-lighting conductors.

\Vithout limiting myself to the precise construction and arrangement of parts shown, I claim 1. The combination of the electro-magnet A, having its coil and its metallic bobbin connected with one section of the main line, an armature pivoted below the cleetro-magnet and connected with the spool. at its pivoted end, an insulated block, 7, connected with the ground and secured to the magnet in a position above the free end olthe armature, and an insulated bracket connected with the other section of the main line and provided with a set-screw below the free end ot the armature, all substantially as set forth.

2. The combination of an electro-magnet having its coil connected with the bobbin and with one section of the main line, and a movable armaturc normallyin connection with the other section of the main line, an insulated block in connection with the ground, and an insulated contact-piece in constant electrical connection with the first section of the main line and arranged in position to make contact with the movable armature when the latter makes contact with the said block, substantially as set forth.

2;. The combination of the electromagnet. main-line conductor 3, connected with the coil of the magnet and with the ln'acket l3, sup porting a set-screw, 15, a pivoted armature extending over the set-screw 15, an insulatml bracket supporting a setscrew, l2, and connected with the other section of the main line, and an insulated block, 7, connected with the ground and arranged above the free end olthe armature, substantially as set l'orth.

t. An electric cut-out composed of a magnetic bobbin and a coil thereon, a conductinglever normally in the circuit connected to one head of the bobbin and an insulated ground connection upon the other head, and a bracket attached to said head and included in the mainline circuit,with which bracket the lever non malty contacts, substantially as described.

In testimony whereot'l: have signed my name to this specification in the presence of two subscribing witnesses.

\TAM'TGS it". lTlll' llEM/XN.

Witnesses:

(Inmates Il. Lovu'r'r, II 111 N u .\f Woo n.

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