US1523570A - Electrical switch - Google Patents

Description

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I Afforgf' 2 Jan. 20, 1925.

Fatented dan. Z, i925.

n i r GEORGE VINTER AND ROBERT WINTER, DE T'JANCHESTER, ENG-LAND.

ELECTRICAL SWITCH.

Application led January 11, 1322.

To all fui/0m t may concern x Be it known that we, Geenen. ENTER and Reenviar VINTER, subjects of the King of Great Britain and Ireland, and residents of Manchester, in the county of Lancaster, England, have invented certain mprovements in Electrical Switches, of which the Jfollowing is a speciiication.

hese improvements relate to electrical plug switches of that type comprising a base plate, and a rotatable plug concentric with the base plate which plug carries radial arms serving as contact pieces to come against liXed contact pieces on the base plate to close the circuit when the plug carrying the pins which are the terminals of the lead and return wires is pushed into the socket.

The object of our present invention is to form a switch of the type above referred to, our invention consisting in the provision and particular combination of partswhich will ensure that, when the plug is rotated in order to close the electric circuit, said plug shall be secured to the base plate and cannot be withdrawn until the plug is rotated in the reverse direction and the circuit opened by the separating of the iXed and movable contacts within the switch body.

In carrying our improvements into effect we provide a switch comprising a base plate, a movable socket and a loose plug member, the base plate bearing contact pieces and the socket bearing radial blades to make contact with said ieces and close the circuit when desired. uch parts are known. On the socket or in such a position as to be movable therewith we fix a spring stop,hereinafter referred to as the locking spring, which when the switch is in the off position engages the edge of a fixed stop projecting Ytrom the base plate, such stop being hereinafter referred to as the locking member. rThe plug has formed with it or iiXed thereon in addition to the two pins serving as terminals for the lead and return wires a locking pin so formed that when the plug is pushed into position the three pins enter holes in the socket and the locking pin pushes the locking spring back to allow radial movement of the socket, the locking spring passing behind the locking' member, the edge of the locking member entering a transverse slot in the locking pin to keep the parts in the closed circuit position by friction.

le will now fully describe a method of Serial No. 528,394.

carrying the invention into effect with reference to the accompanying drawings, in which Figs. l and 2 are front and side elevations of the plug,

Figs. 3 and 4 are similar views of the socket bearing the contact arms,

Figs. 5 and 6 are similar views of the base plate and socket, and Fig. 7 is a sectional view o' the switch as a whole, the plug being shown in outline and the switch being in the closed circuit7 position.

ln Figures l and 2, l is a plug of known type having secured to the inner Jrace thereot1 the locking pin 2 having l'orined therein the transverse slot 3. et, 4 indicate pins, which maybe circular as shown, or of any cross section other than that of pin 2. They may be split as clearly shown in Figure 2. These pins et, 4t are the usual plug pins for the lead and return wires.

ln Figures 3 and t, 5 is a socket, the inner tace of which is shown inFig. 3, mounted on a spindle 6, bearing the contact arms 7 and having fitted thereto, the curved plate spring 8 (the locking spring). Figures 5, G and 7 show the socket 5 secured to the base plate 9 by means of the.' screwed spindle 6, and showing holes l0, il, 1l in the said socket adapted to receive the pins 2, et, 4 ot' the plug l, and also showing clearly in Figure 5, the relative position of these parts on the socket to the usual contact pieces l2 borne by the base plate 9, and the contact arms ot socket in the open circuit position. The plate spring 8 is shown in dotted lines in F igures 5 and G. lt will be seen that the curved end of the latter normally comes against the edge of a lockingl member' 13 secured to the base plate and prevents movement of the socket 5.

When it is desired to rotate the socket so as to close the circuit, the plug l is pushed into position, pin 2 ei'itering hole l0, and split pins 4i, 4s entering the holes ll, ll. The end of pin 2 therefore cornes against he locking spring 8 thus pushing it back as shown in section Figure 7, and out of contact with the locking member i3. The socket may now be turned clockwise as viewed in Figure 5, the locking springl S passing' behind the downwardly depeinling limb of the part 18, to bring the contact arms .7 against the contact pieces l2 carried by the base plate. The slot 3 in locking pin 2 allows oit' lll Qi" 1,523,57o

this movement, the downwardlydepending; end of locking member` 13 entering Said slot" 3. The edge of the looking spring 8, hailing now passed-behind the locking member13,'VA presses against the rear face of the latter, this is, that face thereof which is the nearer to the base plate, and by frictionmaintains the socket in the closed circuit position. A helicalspringl Vvsurrounding the .spindle `6 and pressing the vsocket and base platefap'a'rt.

` contact betweenithe the?, :then pin 2; and elfico-urs@ tlie'hole 10 wherein it ftamayfbe arcuate or other 'shape in 'ross section and the pins 4., 4C and their corresponding fholes :11, Y1 1 .im th'e.fsocket of lanypross section different from that of pin 2." Again-the locking pin 2 needV not be slot'- tecl but maybe formed with a foot or projection 'at right "angles thereto which foot, on the spring 8 beingpushed back by the lockingpinrand theplug turned, would Vengage .the :rear edge ,of lthe downwardly 'dependingedge of .lockingmember 13.

lock-ingfpin '2 may serve as the earthassists this frictlona'l locking spring, 8 on-y the. socket 5 .anclQth'e locking member 413 on the base plate.` The.v socketandbaseplate are thus Ihelfcl intheir irdh.) in@ relative positions, to keep,the1circuit closed,4 vllgiatyye elaimasfour invention and de"- To f )pen` the ci1fcuit,: ythe plug 1 ,is turned sire to secure by VLett-ers Patent iszcounter-clockwise as VieWechnFi'gure .55.. Inanelectric switch, a base plate'ha'ving thus disengaging. the contacts 7 land 12,.,and 7`electni'cal` Acor'ita'ctsy mounted thereon, an 'anatcthe same time movingthe locking spring 8,'Y from behind` member .13 andy disengaging the slot 3 lofpin 2 Afrom the vedge of 4the. saicll loekinggmember. Ou the plug l .beingwvi'thl cliawm'the looking spring resumes .its non. plate,i va cloyvnwardlyflependiiigggl mal: position against the edge of.locki'1g. brack'eton y"the member 1 3, thus preventing vany radial. move. mentAk of socket 5 until the .plug rwith its-spe?. cialslottecl pin 2.is Aagain inserted.) A awoolen case "or covershownin dotted linesatjl, lFigure .7, .isI Aprovided `toy prey'ent rotation of the socket by the fingers, .and the base and-socketmay be. formed of 'anygsuitablematerial yor combination of zma'terialsf '.heplugzmay be of fwood, asfisusual," and.' the metallparts also of. .the :usual metals.

We do not confine. ourselxes to the partic-V ular 'arrangement .shown of "lockingllmem ber 1B, locking springi8,andlocking ping." The. part 81nay be fon instance a straight, not curved, plate1of rspring'steel o-r othifwise, anclwof. suitable thickness... Also las a, ireater-precaution. .against tampering. the switch, lthe locking member '.13 na'y' bj. In rstim'ony Wh'e'reof-"Wehaehereunto provfiled.Withtwoormoredownwardlyeset "'our. lhns.- Y V j pendingl members, with a.. correspo'nfling; r GEORGE-WNTER; number of slots '3 inthe locking Furd R'BTI VINTER.'

cal'` contact blades 'on the 'socket' to make coni tact. ,y'vith the electrical contacts 'on the base borne the "socket and "opposite to 'an' or1" tice therein and.\norn'i'allyjiesting. against the the switch is in theoifposition, `a plug bear# tagt with the-'contact Jblades borne"b'y 'tl1`e sockt".tlirougli orifices in the latter, anclfa the ys'ock"e' t"'to 'pres-s, back tlie plateY` spring borne biylth'e -latter 'andrlallow the' socket'tto be; .rtate'cl Jwhen the plug is inserteclftherein, theV 4short of the 'Lshaped "braaketenteiq` ec'lgehof 'the bracketl 'on tl'iebas'e "plate when.

looking; pin' having a slot.' therein vborne y'by ing ;the slot lin the Vpin 'during'suchrotation gularly 'movable' socket rnmintefd a'on said base. plate'igmd v'Con-centri@y therewith, 'electri-e ing terminal pins 'which make electrical vcon-

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