US1091155A - Electric switch. - Google Patents

Description

T. E. MURRAY'.

ELECTRIC SWITCH.

APPLICATION FILED NOV. 27, 1912.

1,091,155. Patented Mar.24,1914

2 SHEETS-SHEET 1.

Patented Mar. 24, 1914.

2 SHEETSSHEET 2.

. ication.

THOMAS E. MURRAY, or` NEW YORK, N. Y.

' ELECTRIC SWITCH.

. specification of Letters Patent.

Patented Mar.'24,1914.

Application led November l1W, 1912. Serial No. 733,781.

To all whom it may concern:

` Be it -known that I, THOMAS E. MURRAY, a citizen of the United States, residing at New York, in the county of.New York and State of New York, have invented a certain new and useful Improvement in Electric Switches, of which the following is a speci- The invention is an electric switch, 'constructed to close circuit between termlnals vthrough a main fuse, and thereafter to connect a' second fuse in parallel with said main fuse.

The invention consists in the construction, hereinafter -set forth, whereby 'sald swltch 4may be operated to cut said fuses successively into circuit, and whereby access to the switch is prevented when the circuit is closed. In the accompanying drawings F1 ure l 1s a side elevation, showing the mova le portion of the switch raised to open circuit, and also the protective casing. Fig. 2 is a transverse sect-ion through the fixed and movable portions of the switch. Fig. 3 shows in elevation and partial section the position of the parts of the switch when the circuit is closed through the main fuse only. Fig. 4 shows the position of the parts of the switch when the circuit is closed through both fuses. Fig. 5 is a top view-of the device on a re- Y duced scale. In Figs-2, 3, and4 the protective casing is omitted.

Similar numbers of reference indicate like parts. a

The fixed part of the switch comprises a base block 1, preferably of porcelain or other refractory insulating material, secured inany suitable way to the bottom of the inelosing metal casing 2. In said block is a longitudinal recess, in which arel disposed spring clips 3, 4, to which clips the terminals of the line conductor 5 are connected, said conductor entering the casing through openings in its end walls. The spring clips are alike and are constructed 1n vthe following manner: The clip 4 comprises a metal plate 6 which is bent back on itself at 7, then upwardly and then downwardly, as shown at 8, to form one arm of the clip.

Said plate is secured upon the bottom of the recess in the base block by a screw bolt 9 passing through the bent back portion at 7. Another metal plate 10 is placed upon plate 6 and bent upwardly and then downwardly, as shown at 11, to form the other arm of the clip. This plate is secured Vin place by a screw bolt 12 which passes through both plates. The terminals of conductor 5 are provided with metal end pieces 13, having at proJecting plates 14 which are secured by the screws 15 to the upper plates, as 10, of said clips.

The movable part of the switch is constructed as followsz' 16 is a carrier of porcelain or other. refractoy insulating rnateial, suspended on two rods 17, 18, placed as shown in Fig. 3. Said rods pass loosely through openings in the cover 19 of casing 2 and in bosses 20 `on the under side thereof, and are connected above said cover by a bar 21. Surrounding said rods and interposed between minals of a main fuse strip 28 are interposed between the lower members of the loops 26 and plates 29, and are secured by screw bolts 30 passing through said plates 29 and loops 26 and entering bars 27. The-body portion of the fuse strip forms a loop with parallel arms which extends upwardly through an opening in the bottom of carrier 16 into a recess 31 in said carrier. At the bend 32 of said loop said strip is carried through an opening in a partition 33, offiber or other insulatmg material, which partition extends down between said parallel arms.

On carrier 16 are` two contact plates '34, l35, which are bent to lie against the upper surface of said carrier, and against the walls and bottom of the recess in said carrier. Said plates are secured in place by Vthe screw bolts 23. Above the carrier 16 and vbetween l the block and the bosses .20` is a second Vearrier' 36, of porcelain or lother refractory insulating material, 'having an opening 38. Extending across said carrier :and above the opening 38 is a bar 37, through which passes the threaded end of a rod 39, said end being secured to said bar by a nut. The rod 39 passes loosely through openings in the cover 19 and the bar 21, and on its up-A per end has a head 40, between which and said bar is a helical spring 41 which normally keeps the carrier 36 in elevated position and separated from the carrier 16, as shown in Fig. 3. On the under side of carrier 36 are two. Contact plates 42, 43, which register with the contact plates 34, on carrier 16. .Secured to said plates and extending across the opening in carrier 36 is a fuse strip 44.

In order to break circuit between the ter-v minals of line conductor 5,. the carriers 16 and 36 are both raised by hand, the contact plates 24, 25 being then withdrawn from the spring clips 3, 4, as shown in Fig. 1, and supported in their raised position by helical springs 22. In order to establish circuit through the main fuse 28, the bar 21 is pushed down to engage the plates 24, 25 into said clips, as shown in Fig. 3. In order to establish circuit also through the second fuse 44, the rod 39 is pushed down until the contacts 42, 43 on carrier 36 meet the contacts 34, 35 on carrier 16. The two fuses 28 and 44 are then in parallel.

As an illustration of a use of this device; in starting a` motor, circuit may first be closed through both fuses 28 and 44 to take the initial rush of current, and then after the motor has started, the fuse 44 may be raised out of circuit, leaving only the main fuse 28 in action. The cover 19 is downwardly flanged on both sides, and at one end. Its other end, when said cover is placed upon the casing 2, passes under a flange 45, Fig. 1, on the end wall of said casing. In the end flange is an yopening toy receive a slotted projection 46 on said casing, which projection receives a seal fastening 47. It is to be noted that even after the seal fastening has been removed, the cover cannot be taken from the casing unless the plates 24, 25 are raised out of the spring clips 3, 4. Then said cover can be slid oft the casing in the direction from right to left of Fig. 1.

I claim.:

l. An electric switch, comprising a support, circuit terminals thereon, a hollow nu vable carrier, a fusein said carrier having terminals on the exterior thereof coperating with said circuit terminals, a second carrier. movable independently of said first carrier, and a fuse on said second carrier having its terminals coperating with the fuse terminals on said first carrier.

2. An electric switch', comprising a support, circuit terminals thereon, a hollow movable carrier, two pairs of contacts thereon, the members of each pair being connected, a fuse in said carrier connected to said pairs, a second carrier movable independently of said first carrier, and a fuse on said 'second carrier having its terminals coperating with a member of each of said pairs of contacts; the remainingmembers of said pairs cooperating with said circuit terminals.

An electric switch, comprising-an inclosing casing, fixed circuit terminals therein, a movable carrier, contacts on opposite sides of said carrier, rods extending from said carrier through a wall of said casing, a connecting device for 'said rods outside of said wall, springs interposed between said device and said wall, a second movable carrier interposed between said first carrier and said wall, contacts on said carrier, a rod extending from said second carrier through said wall and connecting device, a head on said rod, and ,a spring interposed between said head and said connecting device.

4. An electric switch, comprising a casing, avslidable cover thereon, means for preventing lifting of said cover from said casing, a movable-switch member supported on y said cover, and a fixed switch member engaging with sa1d movable member and disposed within sa1d casing: whereby upon the engagement of said switch members remoral of said cover from said casing by slidmg as aforesaid 1s prevented.

In testimony whereof I have affixed my signature in presence of two witnesses.

THOMAS E. MURRAY. Witnesses:

GERTRUDE T. PORTER,

MAY T. MGGARRY.

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