US1305381A - Safety - Google Patents

Description

W. S. LEVIN.

RELAY. APPLICATION FILED MAY5, 1915.'

Patented June 3, 1919.

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W; S` LEVIN.

RELAY.

APPLICATION FILED MAY 5. I9I5.

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' 1,305,381. Pmndlune 3,1919.-

UNITED sTATEs PATENT oEEioE.

WALTER S. LEVIN, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE NATIONAL SAFETY APPLIANCE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORA- TION OF CALIFORNIA.

RELAY.

Specification of Letters Patent.

Patented June 3, 1919.

Application ledMay 5, 1915. Serial No. 25,895.

To all 'whom t may concern.'

Be it known that 1, WALTER S. LEVIN, a citizen of the United States, and a resident of San Francisco, county of San Francisco, State of California, have invented certain new and useful Improvements in Relays, of which the following is a description.

This invention relates to relays and to that class thereof which is especially useful in line circuits and train signaling and stopping apparatus. One of these relays is to be used at every signal or automatic stop location and is supplied with current through the necessary line wires connected with a proper battery through thev contacts of a track relay which in turn is connected, through the rails, with a battery at theJ other end of a neighboring blockthe `pres*- ence of a. train in this block shunting the current of the track relay thus causing it to drop its armature and open the circuit of the line relay which in turn drops its armature thus setting the proper caution and danger signals. One of the objects of the present invention is to make the use lof the back contact, which in all previous patterns of relays is held closed only by the weight of the armature, just as secure as the front contact normally used and this object has been obtained by the construction of the present invention which makes the back contacts just as secure as, or more so than, the front contacts of relays heretofore commonly used. Other objects will appear from the hereinafter description.

The invention will be understood by one skilled 'in the art from the following description taken in connection with the accompanying drawings wherein the same reference character indicates the same part in the several views.

Referring to the drawings:

Figure 1 is a cross sectional View, partly in elevation, illustrating one embodiment of the invention.

Fig. 2 is a horizontal section on staggered line 2 2 of Fig. 1.

Fig. 3 is a cross sectional view 0n line 3-3 of Fig. 1. y

Fig. 4 is a perspective view showing diagrammatically a simple embodiment of the invention.

. On the drawing the part marked 10 represents a casing, to the cover 11 of which 'are secured the several parts of the relay.

A represents a pair of electromagnets the windings of which are connected by wires R through a contact make and break device S to a battery T. These magnets are provided with L-shaped-pole pieces B which may be formed integral with the cores A. The two members are marked respectively, b1, b2, the latter being a projection on the ordinary form of pole piece b1. b3 represents screws which pass through the pole pieces and are screwed into the cover 11. O is an armature to which are secured the arms c1 and by which the armature is pivoted at 02 to lugs 12 on the cover 11. H 1sanother armature to which are secured the arms h1 by which the said armature is pivoted at 71.2 to lugs 13 projecting from the cover of the casing. The armatures are so constructed'and arranged that they coact respectively with the members b1 and b2 of the pole pieces B, and the movement of one is entirely free and independent of the movement of the other. D represents pieces or blocks of insulating material secured to the armature O and to which are secured the contact arms F and which insulate the said arms from the armatures. D is another 'piece of insulating material secured to the armature H and to which the Contact arm E is secured and by which said arm is insulated from the said armature H. G is an electromagnet supported by the L-shaped brackets 14 secured to the cover of the casing. The brackets 14 aiford respectively 'suitable supports fora block of insulating material 15 to carry suitable terminals or binding posts 16 to which the wiring shown diagrammatically in Fig. 4 may in practice be connected. This magnet is provided with vupwardly extending pole pieces N which are so arranged that they attract the armature C but have no influence on the armature H so as to effect its practical operation. In other words, no appreciable influence is exerted upon the armature H. In the 'diagrammatic view of'Fig. 4, for the purpose of clearer illustration, this magnet is shown elongated and the pole pieces near Vthe end of the armature C, but in practice when the said arms are held up by the-magnets A. The letters K'represent the back contacts respectively for each ofthe arms F, and K the back contact for the arm E and against which the said arms rest when they have been released from the magnets upon the opening ofthe said magnet circuit. M represents terminals or binding Vposts connected to the Contact "arms `F by fiexible connections L, and M is another terminalor binding post connected to the arm E by `a flexible connection L, Vthe said terminals being used to connect suitable wiring. C represents circuit wires,one section of which connects the magnet'G tothe back contact K, and the other sectionof which connects said magnet with the nterminal or post M, throughthe battery P.

The contact arm E is used only forcon-` trolling the circuit of the electromagnet'-G, while 'the arms F are used for 'controlling external circuits, any-number of which may be used, only two being shown for illustrating the action of the relay.

The operation of theV inventionfmay be briefly stated as follows :k Vhen the magnets A are energized by operating vthe contact making device S, the armatures C and H are drawn in contact with the pole pieces B and the contact arms F and E are'held firmly against the front contacts I and I. When the circuit of the magnet is broken by opening' the contact device S, the magnets A are deenergized, the armatures C and H are released fromthe pole pieces and drop away therefrom and the respective contact arms Fand E carried thereby come into en.

gagement with the back contacts IK and K respectively. The closing of-the contact between E and K causes the magnet G to'be energized, whereupon the armature C is attracted-by the pole pieces N and the contact arms F connected to ythe armature C are firmly held against the back contacts -l/Vhen the magnets vA are again energized, the 4armature C will not immediately be raised, as it is held down by the magnet G, but'the poleeXtension b2 attracts the armature H which raisesthe arm E out of engagenient with the contact K to open the circuit O, whereupon the magnet Gr is denergized and the armature 'C is released 'from the poles N of the magnets A, whereupon the arms carried thereby are Vraised and 'held against the front Ycontacts I. If desired, the ends of all of the contact arms may be provided with contact l'ingers el, e2, and f1, f?, as shown-in Figs. 1 and 3, which may be made 'of spring metalv whereby a yielding engagement with the frontrandbackrcntacts may be secured. y Y

As'many changes could be .made in the yabove construction and many apparently widely different embodiments vof the invention could be made without departing from lthescope thereof, I intend that all matter 'contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I desire it also to be understood that modifications ofthe structure may be made which fall within the scope of the claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In'a 'device of the class described, an electrolmagnet having a pole piece with a projection connectedthereto, an armature to be a'ttract'e'd'by vthe pole piece, another armature tobe "separately and independently attracted bythe sai'd projection, a contact arm connected'to e'ach armature, frontand rear contacts against whichthe arms Contactin one position or`the other, a second magnet, anda circuit connecting said second magnet and the arm connected to the second mentioned armature, said circuit being opened when the first magnet is energized and closed when the said 'iirst magnet is denergized, whereby these'co'nd magnet is energized and holdsthe arm connectedto'the irst armature incontact with the back contact.

2. In a device of the class described, an electromagnet, an -L-shaped pole piece therefor, an armature-attracted by one member ofthe said pole piece, another armature attracted by the other member"thereof independently of the first armature, contact arms carried by ture,lanother contact arm carried by the second armature, front and back contacts for each arm, another electromagnet to attract the first mentioned armature andhold the first mentioned arms in contact with the back contacts, the second magnet being in circuit with the arm carried by the second armature andthe back contactther'eof and energized when the'irst mentioned magnet isldenergized i V3. In a device of the class described, an electromagnet, a pole Ypiece therefor, said pole piece consisting of amain memberl and asecond member, a hinged armature adapted to be attracted by the main member of the said pole piece when the magnetis energized, a second hinged armature adapted to be attracted by the second member of the pole piece independently of the first armature when the magnet is energized, contact arms connected 'to and insulated from the rst mentioned armature, an arm connected to and insulated from the second mentioned armature, front and Aback contacts foreach varnna second magnet having pole 'pieces adjacent to and adapted to attract the first mentioned armature, said magnet being in circuitwith the last mentioned arm andthe the -first mentioned armathe second magnet Will be energized through the last mentioned arm and its back contact and will hold the arms carried by the first mentioned armature against the back contacts thereof, and upon the first mentioned magnet being energized the second mentioned arm Will be attracted by one member of the pole pieces independently of the first armature and break the circuit of the second magnet, whereupon the first mentioned armature will be attracted by the pole piece and the first mentioned arms will be held in engagement with the front contacts.

4. In a device of the class described, an electro-magnet having a core provided With an L-shaped pole piece, the separate arms of saidV L-shaped pole piece adapted to independently attract separate armatures, and armatures therefor, each armatureroperating respectively with a separate arm of said L-shaped pole piece.

5. In a device of the class described, a support, an electromagnet secured thereto, a second electromagnet secured to the said support pole pieces for each magnet secured adjacent to each other, nested armatures secured to the support and cooperating respeetively with separate portions of the pole piece of the first mentioned magnet, one of said armatures also coperating with the pole piece of the said second magnet, fixed contacts and contact arms insulatively connected With the respective armatures.

6. In a device of the class described, a support, an electromagnet secured thereto, a second electromagnet also secured to the said support, a stepped pole piece for the first mentioned magnet Dole piece for the second magnet, nested armatures pivotally secured to the support and cooperating respectively with the separate portions of said stepped pole piece, one of said armatures also coperating With the pole piece of said second magnet, fixed contacts and Contact arms insulatively connected with the respective armatures.

In Witness whereof, I have hereunto set my hand at San Francisco, county of San Francisco, State of California, this 26th day of April, 1915.

VALTER S. LEVIN.

In presence of- Gnonen C. FAULKNER, GoLDAH CHARMAK.

Copies 9! this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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