US1504171A - Electric switch - Google Patents

Description

n H. E. WHITE ELECTRIC SWITCH Filed Jan; 16, 1920 .2 snurpsmea 1 is it J entrant HAROLD ELIJAH VEIIITE, OF EIONTCLAR, JERSEY, ASSIGNGR TO CROCKEB- WHEELER. COMPANY, OF All/IPERE, JERSEY, .A CRPORATON OF .NEV

JERSEY.

ELECTRIC SVJI'CI-I.

Application lcd January 16, 1920.

To @ZZ colto/m. t may concer-n 15e it known that l, Harrow lllmaixrr liilnrrn, a citizen ot the United States ot America7 and a resident o' lilontclair., in the county oit` Essex and State oit Blew Jerseyn have invented certain new and useful lmln'oven'ients in Electric Switchesj ot' which the 'following is a specification.

rEhe object ot this invention is to provide an electric switch ot substantial construe tion tor establishing and breaking electric circuits. A turther object is 'to provide an oil-switch within a container with a hi cover wherein the switch is Varricd by the cover and the parts are so organiz/.ed and arranged that the container n1= y be set against the wall and the cover hlted sutilciently to give access to the switch contacts for inspection ance-repair and to permit oit the removal ot. the oil-well. ik further object is to provide a suitable parallel movementy tor the movable contactfcarrying element of the switch whereby the contacts are brought together without being inclined to each other and good contact is insured.

In the accompanying two sheets ot drawings which form a part of this application- Figure 1 is a vertical section through a container with a switch embodying this invention on the line l-H ot Fig. 3, the cover being lifted. l

Figure 2 is a similar section, the cover being closed.

Figure 3 is a vertical section through the container on the line Ill-lll ot Fi.

Figure 4e is a vertical section thro gli the container on the line 117-117 of lliU 1 showing the no-voltage release magnet.

Figure 5 is a vertical section through the cover of the container on the line lil-V of F ig. 3.

The invention as illustrated is embodied in a starting switch for squirrel-cage ir- -duction motors. A container 5 with a hinged cover 6 encloses the switch and accessory apparatus, and the cover is a support for the switch. The switch comprises a fixed contactarrying element i' in the form of a slab of insulating material which is carried within the cover between parallel bars 8, 8 which are bolted to the sides of the cover. Switch terminals in a forward row 9; a middle row 10, and a rear row l1a are carried by this slab and torni the contacts of this element. A. movable contact- Serial No. 351,843.

carrying element l2, also in the form oit a slab orx insulating material, carries contacts 131 123 which may be brought into contact with either olf the side rows ol" switch terminals and the middle row, and suitably connect them. The movable contactecarrying element is carried by two plates lei, l-lf, and these are each carried from the support through parallel links 15, 16. ln addition there are links 17, 17 at the ends olf the switch in the Yform ot blocks mounted on a sha-it itl with a handle 19 by which the switch is operated. rl`liese links are ot thc saine length and parallel and in triangularly disposed relation to the other links. ilhe blocks also carry pins 20, 2l) which are engaged by the ends oli a coiled switch spring 21 which tends to bring` the switch to an intermediate open position troni either ot the two closed positions.

.n starting a motor with the switch, the handle is drawn forward whereby the movable clement ot' the switch is made to connect between the contacts in the middle row and the contacts in the rear row, and circuits are closed tor effecting the starting ot the motor on a low voltage. lnitial movement ot' the switch in the opposite direction is prevented by a roller 22 which is carried by one ont the blocks and is obstructed by a latch prong 23. This latch prong is carried by a lever 241 which connects through a link 25 with the armature 26` of a magnet The magnet has a threepole laminated core QS' which is supported in frame 29. rllhe armature is fulcrunied on one corner of one of the poles and is held ott from the other poles by a pair oit armature springs 30, 80. @losing ot the switch admits alternating current to the magnet and the latch prong is drawn. out o'lt the path of the roller. Having first closed the switch on the starting position, the handle can be thrown back whereby the movable element ot the switch is made to connect between the contacts in the middle row and the contacts in the forward row and establish the full-speed running connections. While the magnet releases on opening the switch9 the inertia ot the armature and latch is sui'iicient to prevent the prong from moving into the path of the roller before the switch can be thrown to the running position. Vhen the switch is thrown to the ruiming position it is latchcd by reason of the roller coming into engage ment with a second prong 3l, as the blocks 17, 17 are then in the position shown in dotted lines in Fig. 2. The adjustment is such that this prong when the magnet is energized projects only slightly into the path of the roller, suiiiciently to prevent the switch spring from returning the switch to open position, but not suiiiciently to obstruct the manual operation of the switch.

The switch elements are submerged, when the cover is down, in an oil-well 34, which is supported in the container on a shelf 35.

Since the switch and accessory parts, which may need inspection, are located in the cover, they are at a convenient height, readily accessible and in a good light when the cover is liited. The switch parts are in such relation to the oil-well that when withdrawn from the well by the lifting of the cover, any oil which temporarily adheres to these parts will drip back into the well and not reach any other parts of the apparatus.

It is trequently desirable to locate this apparatus against a. wallwhere floor space is to be found which is not needed for other purposes and conductors can be more conveniently led to it, and in such a position the extent to which the cover can be thrown back is limited, but with the switch organized and proportioned as shown and operating as set forth, the oil-well can be sutiiciently large yto permit oit the operation o'i the switch in at-he submerged position, and with the cover raised to the permissible extent there is enough space Ytor the oil-well to be ii'i'ted out to change the oil, so that a drain-cock, with the chance of leakage which it would have, need not be provided.

I claiml. An electric switch comprising a support, a fixed contact carrying element carried by the support, a movable contact-carrying element, and equal parallel links in a triangularly disposed relation for connecting points in fixed triangular relation on the movable contact-carrying element with points in fixed triangular relation on the support, substantially as described.

2. A double throw starting switch for elect-ric motors with a starting and a running position and an intermediate open position, a magnet in a circuit which is closed when the switch is closed, means for preventing throw ot the switch to running position which is withdrawn by the magnet when energized, means for holding the switch in running position which is held in operative position by the energized magnet, and automatic means for returning the switch to its open position.

Signed at East Orange, N. J., this 14th day oi2 January, 1920.

HAROLD ELIJAl-l VHITE.

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