US691766A - Electric switch. - Google Patents

Description

' No. 69|,766. Patented Ian. 28, I902.

, E. M. HEWLETT.

ELECTRIC SWITCH.

(Application filed Jan. 12, 1900.)

(No Model.) '2 Sheets-Sheet I.

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' No. ssmss. I Patented Jan. 28, I902.

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ELECTRIC SWITCH.

(Application filed Jan. 12, 19 00.)

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NITED STATES PATENT OFFICE.

EDWARD M. HEWLETT, OF SCHENECTADY, YORK, ASSIGNOR TOTHE GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC SWITCH.

SPECIFICATION forming part of Letters Patent No. 691,766, dated January 28, 1902. Application filed January 12, 1900. Serial No. 1,173. (No model.)

To all whom it may concern:

Be it known-that I, EDWARD M. HEWLETT, a citizen of the United States, residing in Schenectady, county of Schenectady, State of New York,have invented certain new and useful Improvements in Electric Switches, (Case No. 1,488,) of which the following is a specification.

The object of my present invention is to provide a multiple-point switch by which connection of currents of large amperage may be made between or with difierent circuit-mains.

In carrying out my invention I provide a plurality of terminals, rotatively connected with one of which is a switch-arm carrying a bridge adapted to be shifted into connection with one of a number ofv cooperating terminals and locked in good conductive relation thereto. I provide ashunting-contact adapt-- ed to permit sparkless interruption of the main circuit in the manner customary in the construction of modern circuit-breakers and journal the support which carries the bridge for movement in a plane away from the terminals, so as to permit the bridge to be rotatively operated to connect any desired pair of terminals. I provide also means for looking the bridge into intimate electrical contact with the terminals, such as a toggle provided with an operating-lever for cramping or releasing the same.

My invention involves various features of construction,the novelty of which will be hereinafter definitely pointed out, and specifically indicated in the claims.

In the drawings which illustrate my invention, Figure 1 is a sectional view of a switch embodying my improvements. Fig. 2 is a plan, and Fig. 3 is a section on the plane of the line X X of Fig. 1.

The operating parts of the switch are secured to an insulating-base of marble, slate, or other non-combustible insulating material, as indicated at 1. Tothe rearof this maybe secured, by bolts or screws, 3. metal frame havinga flange on the inside, as indicated at 2, by which the apparatus may be bolted to the switchboard or other support. Upon the insulating-base 1 are mounted a plurality of terminals 3 3 3 3,secured to the base by screws passing from the rear, as indicated. The out:

movable arm which carries the bridge 6. The

inner part of the terminal 3 is hollowed to accommodate the movement of an extension 7, forming part of the rotary member of the switch. The end walls of the inner end of the terminal form: stops to limit the movement of this arm, as indicated in dotted lines in Fig. 2 at S 8. A metallic segment of a circle is .screwed to the base and provided with a groove, into which the extension 7 projects and which serves as a guide and an abutment to take the strain of the toggle. A pin 10 rests in a hole bored in the end of the arm and is pressed outwardly against the upper edge of the segment bya coil-spring, as indicated. This pin isslotted on its rear end, through which slot passes a pin 11, which prevents it from turning. The outer end of the pin carries a roller 12,wl1ich bears against the face of the segment 9. In the latter ata central point is a recess, into which the roller is projected by the spring and which serves to lock the switch in the central position. The

roller seated in the recess is indicated in Fig.

2 in dotted lines. This lock is, however',not sufficient to prevent a forced movement of the switch to either side.

Jourhaled on the end of the extension 7are two rods extending outwardly from the sup port, as indicated at 13 13 in Figs. 1 and 2.

and the terminal 3 atcated at 19, which bear firmly against the terminals upon the bridge-support. Upon the same pivot upon which the links 17 17 and the bridge 18 are journaled is journaled an arm 20, forked at its lower end and pivoted to the rotary switch member at 21. Integral with the part 7 isasocket 22 forahandie 23, by which the movable element of the switch may be rotated. A shunt-contact 24 is mounted upon the end of two or morelamiuse of spring metal, as phosphor-bronze, Se

cured to the bridge 6 and in good electrical contact with the metallic portion of the rotary switch. member, as indicated at 25. The length of the spring upon which the shuntcontact 24 is mounted is such as to permit said contact to be held by the resilience of the spring in engagement with its cooperating shunt-contact 24 until after the bridge has left the terminal. Thus, in closing, the shunt is first completed, and the spring carrying the contact is then put under tension, after which the bridge-contact is completed. The shunt-contact 24: is made of carbon and is inclosed in a chute 26, formed of two walls extending in a plane at right angles to the base. Outside of the chute-walls are two iron extensions, as 27 27, (see Fig. 3,) forming pole extensions of a core of a magnet-coil 28, included in series with the switch. This coil is formed of a few turns of heavy copper of sufficient capacity to carry the currents of heavy amperage for which the switch is used without undue heating. Between the adjacent terminals to which the switch may be shifted are placed barriers 29 29, of insulating refractory material, which rise above the plane of the terminals sufficiently to prevent the possibility of arcing from one to another. These barriers may be secured to the support in any suitable way. An efficientform (shown in the drawings) consists in boring two or more holes in the base and countersinking or enlarging the bore, as indicated at 30 in dotted lines in Fig. 1, and introducing a lead socket to receive the'screws.

In operating the switch the toggle is first knocked down by pulling outwardly the handle 16, when if the switch is in a vertical positionit will drop to the position indicated i n dotted lines in Fig. 1, first opening the main contacts between the terminals and the bridge 6 without arcing and producing a final break at the shunt-contact 24, the are being blown out by the magnetism developed by the coil 28. A cushion 31, of rubber or leather, set in the lever 15, receives the impact of the movable parts as they drop to the dotted position in Fig. v1. The switch may then be shifted by the handle 23 into position to engage one of the terminals 3 3 3 and closed by pressing outwardly from the base the handle 23 and then pressing toward the base the handle 16, thereby-cramping the toggle and forming a firm contact between the bridge and the two terminals to be connected.

It is desirable to prevent the passage of current across the joint between the pivot of the movable switch member and the terminal 3 after the main contact made by the bridge is opened. In order to effect this, I provide in the base of the pivotal point a few thin sheets or laminze of copper 32 in good conductive relation to the movable member, being screwed thereto, as indicated in Fig. 1, and pressed by a spring 33, nesting in a recess in the journal. This plate bears upon a hard-metal plate 34, screwed fast to the terminal 3. Thus there is a path for cnrrentto the shunt-contact independent of the joint between the movable member and the main terminal, and when the handle 23 is pressed a very firm engagement of plates and 33 is effected.

WVhat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. An electric switch comprising a movable switch member,a plurality of terminals adapted to be connected thereto, a circuit-closing contact movable outwardly in a plane away from the terminals, to permit the switch to be shifted laterally into cooperative relation to any desired contact, and a toggle for cramping the contacts into intimate engagement.

2. An electric switch comprising a rotary member movable in the plane parallel to the base, a plurality of terminals adapted to be engaged thereby, insulating-barriers between the terminals, a contact carried by the rotary member movable to and from the base to clear the barriers and a toggle for cramping the contacts in firm engagement.

3. An electric switch comprising a movable member journaled for movement in the plane parallel to the base and in continuous connection with one circuit-terminal, an arm mounted on the movable member and movable away from the base, a bridge for the terminals carried by said arm, a link between the arm and the movable member, and a toggle to cramp the bridge and effect a good contact.

4. In an electric switch, a plurality of terminals, a rotary switch member permanently connected with one of the same and adapted to effect connection with any of the others, a pivoted bridging-contact carried thereby to effect such connection, a switch-operating handle, a toggle connected to the bridgingcontact, a handle to cramp the same, and a link connecting the rotary member and the cramping-handle.

5. In an electric switch, the combination of a plurality of terminals, a switch-arm 7 journaled in one of them, a fixed guide engaging the end of the arm, a toggle and operatinghandle pivoted to the arm, a bridge-contact, and a pivoted arm provided with a handle carrying the contact and connected to the toggle.

6. In an electric switch, a plurality of terminals, a switch-arm, journaled in one of them for movement in a plane parallel to the base, a bridge-contact movable away from the IIO base, a shunt-contact to prevent arcing at the bridge, and a branch connection bet-ween the terminal and the switch-arm to divert the current to the shunt'contact from traversing the joint. 1

7. The combination in a-switch of a circuitterminal, a rotary switch-arm, an operatinghandle therefor, a bridging-contact carried thereby, and a plurality of metal laminze between the arm and the fixed terminal, said laminae bearing face on between the arm and the terminal and efiecting a good rotary contact to divert current from the joint and provide a yielding connection.

8. In an electric switch, a base, a rotary arm carrying a bridge-contact pivoted for movement away from the base, a fixed guide 9 for the end of the arm to brace the same when cramped and a toggle connected to the end of the arm to cramp the bridge-contact.

9. In an electric switch, a rotary arm carrying a bridge-contact pivoted for movement away from the base, a fixed guide for the end of the arm, a toggle connected to the arm to cramp the bridge-contact, a plurality of terminals, and stops for the arm when in position to close the circuit at the several terminals.

10. In anelectric switch, the combination of a rotary switch-arm journaled in a terminal, a'plurality of cooperating terminals, a bridge-contact, a pivoted arm 20 carrying the same, links 13 13, a toggle between the arm and the links, and a handle to operate the toggle. I

In Witness whereof I have hereunto set my hand this 10th day of January, 1899.

EDWARD M. HEVLETT.

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