US1685664A - Electric switch - Google Patents

Description

w 259 @928, L5 ff 1K., EAUIERSCHMIDT ELECTRIC SWITCH.

Filed April '7, 1925 um@ @UQVSCMWMML Patented Sept., 25, lQI-.,

KUN@ BUERSCHMIJDT, OF HARLSHORST, GERMANY, ASSGNOB, T0 GENERAL ELEC- TRIO COMPANY, A CORFORATIiI DF NEW" ELECTRIC S'EUEI.

Application filed April '.7, 1925, Serial No. 531,352.0, and n Germany May 3, 192e.

i eliminated or at least reduced to a minimum.

lrloreover, .it is important ifor Space economy and sa'lety that the striking distance between the contacts when the switch is open be a maxiniium lor a minimum spacing between conductors.

An object of .my invention is toln'ovide an improved electricl switch in which the sta-tic proi'iciities of t-he insulators are utilized to the bes" adwintage and in which a safe arcinp; distance between the contacts of the switch in the circuit open position thereof is obtained without so decreasingthe arcing distance between phase conductors as `to vnecessitate a great increase in the spacingv thereof.

`lli/ly invention will be better understood :trom the following description taken in con- 'nection with the accompanying,` drawing and its scope vwill be pointed out in the appended claims.

ln the accompanying drawing Fig. 1 is an elevation ot an electric switch embodying my invention Fig'. 2 is a plan oi the switch shown `in Fig. 1; Fig. 3 is a part sectional view on 'the line 3--3 ot Fig. 2; and Fig'. 4 is a plan oit modification of the embodiment ol" my invention shown in Fi 1 and 2. i

Referring now to the several iilrures o't the drawing, a plurality ot stationary supporting members, such as two substantially parat lel insulators 10 and 11, are mounted on a suitable framework which may comprise longitudinal and transverse s ructural meinbers such as channels 12 and 13, and plates 141-.

he insulators 10 and 11 support line terminals 15 and 16 respectively. and one of the insulators 10 supports a suitable contact 17. Cooperating` with the contact 17 is a contact 18 which is mounted on a suitable support such as a movable insulator 19. rlhis insulat-or is arranged for revolution about an axis intermediate the insulators 10 and 117 so as to act-nate the contact 18 from a position adjacent insulator 10 to a position adjacent insulator 11, indicated by the dot and dash lines, in the circuit opening movement ol the switch and vice versa. For this purpose, the .insulator 19 is mounted on one end of a crank 20 which is rigidly secured to a: shaft 21 rotu tai-,ably mounted on the supporting framework.

rlhe anis of revolution of the insulator 19, that is the shaft 21, may be substantally parallel to, and is preferably substantially equi- @5 distant 'from the insulators 10 and 11 in order to obtain the n'iaximuin distance between the contacts 1'? 'and 18 in the circuit open `positi on oi the switch. The axis ot the shaft 21 may liecoplanar with the axes olf both of 7U the insulators 1() and 117 as illustrated in Fig. 2, or oi'liset trom the plane oi the axes of the insulators 10 and 11 as illustrated in Fig. 4t. rl`he distance between the movable insulator 19 and its axis of revolutionn the shaft 21, 'To` or in other words the length ol. the crank 20', may be approximately equal to one-halt ot the distance between the insulators 10. and 11 in order to get the maximum Contact separation without the necessity o't'unduly spread- 8U ine; the phase conductors. For the samepurpose,` and also 'for stillness, the contact 18 may be relatively short.

lt will be obvious that with the arrangement shown in Figi'. 2, the arcingr distance be-4 35 tween conductors is reduced in the maximum transverse displacement of the contact 18 only by approximately one-halt the throw or' the Contact 18, while in the full open postion the contact 1S is so positioned as not to oo decrease the effective arcing distance ben tween phase conductors when a plurality of switches are employed side by side in the respective phase conductors. With the arrangement shown in F ig. 4, the arcing' disne tance between conductors is reduced still less, since the maximum transverse displacement ot the movable insi'ilatoii' 19 from the plane of the aires oi? the insulators 10 and`11 is considcrably less than the length oi' the crank 20.

ln either case, since the movable insulator does not have to transmit motion by rotation about its own axis, it is not submitted to torsion and the bending' stresses induced on contact separation and closure are relatively small.

ln order to insure correct alinement of the contacts 17 and 18 'for circuit closing, a guide plate 22 having' a sloping face may be mounted shown in detail in Fig. 3. This plate is lill) lilith lill) arranged so that the insulator supporting end of the crank rides up on the sloping face of the plate as the contact 18 'is moved to circuit' closing,r position.

For conducting current from the stationary insulator 11 to the movable insulator 19, an articulated connection *comprising links 23 and 24 may be used or these may serve merely to support a flexible conductor which carries thev current'. n For obtaining the necessary 'freedom' or universality of movement, thev links 23 and 211 are connected to each other at one end and at the otherend to the supports 11 and 19 respectively by any suitable means such as swivel mountings or universal joints, Vexamples 0i which are known to the art.

VVhatlelaim as new and desire .to secure i byQLetters Patent ot the United States is z- 1. An electric switchl comprising two stationary line terminal supports, a contact lmounted on one of said supports, a cooperating movable Contact and means for actuating said movable Contact to and from circuit closing'position with the stationarycontact,

mediate oi' and substantially parallel to said stationary supports Jfrom apposition adjacent one of them toa position adjacent the other. 3. An electric switch comprising two stationa'ry line terminal supports, a. Contact y mountedon one ofsaid supports, a cooperating movable Contact, and means for actuating said movable contact to and from circuit closing position with the stationary contact comprising a support mounted for movement ,about an axis substantially parallel to and equiidistantl `from said stationary supports from a position adjacent one of them to a position adjacent the other.

4t. An electric switch comprising' two substantially parallel stationary line terminal supports, a contact mounted on one of said supports, a cooperating movable contact, and means for actuutinpT said movable contact to and 'from circuit closing position with the stationarjv contact comprising a support mounted 'for revolution about un axis substantially parallel to and equidistant from said stationary supportsl trom a position ad jacent one of them to a position adjacent the other.

5. An electric switch comprising?r two sla tionary substautiallj/.f' parallel line lern'linal insulators, a contact mounted on one olE said insulators, a cooperatin;l contact, means for supportinfol and actuatingl said cooperating contact to and trom circuit closing.:T position with said stationary contact comprising an insulator mounted for revolution about an axis olfset from the plane of the axes ol said stationary insulators and cquidistant thereirom from a position adjacent one of them to a position adjacent the other.

G. An electric switch comprisiiu;` two stationary substantially parallel line, terminal insulators, a contact mounted on one of said insulators, a cooperatingcontact and means tor supporting and actuetingl said cooperatingr contact comprising au insulator mounted 'for revolution about an axis ollset 'from the plane oi the axes ot said stationary insulators and equidistant therefrom from a position adjacent one oi them to a position adjacent the other through an angle ol' approximately 1800.

7. An electric switch comprising two sub stantially parallel stationary line terminal supports, relatively movable coolrierating contacts, one being mounted on one ot .said supports, means for actuating' the other ot said contacts to and from circuit closing position with the stationary Contact connnisingr a supportmounted for revolution about an axis substantially parallel to and equidistant from said stationary supports from a position ad jacent one ot them to a position adjacent the other, and an articulated connection between said movable support and one of the stationary supports.

ln witness whereof. l have hereunto :ict mv hand this 18th nay oit March, 1025.

KUNG BAUERSCl-l MID'V

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