US1299926A - Combined electric plug and switch. - Google Patents

Description

D. M. EDWARDS. COMBINED EvLEcmc PLUG AND SWITCH. A

APPLICATION FILED SEPT.27'. 19|?.

Patented Apr. 9,1919.

1M .w 9% N New U ww 99.. 9 N m. S. m .W ma W N wv Q. KN NN QN W Q 'wie 1% DAVID EDWARDS, OF LONDON, ENGLAND.

COMBINED ELECTRIC PLUG SWITCH.

To all whom may concern Be it known that I, DAVID MUSGRAVE ED- -wARD's, a subjectl of the King of'Great Britain, residing in London, England, have invented a certain new and useful Combined Electric Plug and Switch, of which the following is a speciiication.

The invention relates to a .combination of an electric switch with a wall socket and l)nhe invention differs. from other previously known devices for this ur vose in being ada tedy for easy application to switches o usual construction and mount- 'in'g and for this urpose the wall socket and plug are fitted y the side of and adapted to be placed on the same support as the switch.

According to the invention a wing, or projection, on the plug engages, when the plug is inserted in the socket, wlth a plunger operating the switch and displaces 1t against the resistance of a The device accor g to the invention 1s ver easily adapted to the conditions in which the plug and switch, o r the switch only, are to be made water-tight, but-1t 1s also very useful, wherever circuits conveying currents are closed or o ened by wall plug contacts, for example, or electric heating a paratus and for machine tools 1n worksliops.

In the accompanying drawings, Figures 1 and- 2 are, respectively, a sectional elevation and a plan of an example of a combined wall socket plug and switch according to the invention in which the combination 1s made water-tight. Fig. 3 shows the plug removed and replaced by a cap. F lgs. 4 and 5 show modifications in which the. parts are not inclosed in a water-tight casng.

In the example shown in' igs. 1-3, 1s a plug contact device of u sual construction, but provided on one side with a wing pro] ection 2 adapted to enga e with a plunger 3 sliding in a tubular gui e 4 bolted by flanges 5 to the cover 6 of a metal casing 7, in which is inclosed a tumbler switch 8 of usual type.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application led September 27, 1917. Serial No. 193,570.

Contact pins 9 and 10 of the plug 1 engage in well-known manner with tubular contacts in a porcelain socketll. The socket 11 is inserted in a short metal tube 12 screwthreaded externally and secured to the cover of the casing 7 by a ange 13. A circular nut 14 engaging with the thread of the tube .12 and provided with a milled head serves to compress arubber packing ring 15 to prevent any access of water to the socket. f the lit. of the plunger 3 in the tube 4 is not' suiicient to prevent water finding its way to the switch contacts a packed gland may be provided. A recess 16 in the plunger 3 engages with the pip 17 of the tumbler switch 8 and the arrangement is such that as the plug. 1' is inserted in its socket, the plunger is displaced by the wing 2 against .the resistance 'of a spring 18 to close the switch contacts 19, which are ,only completed when the plug contacts have been pushed home. f

On the withdrawal of the plug, the plunger 3 is rapidly forced back by 'the spring 18 and by the action of the switch springs the contacts 19 are released before the plug contacts have been withdrawn, so that no sparking at the plug contacts or shocks ,to the operator are possible either on the insertion or the withdrawal of the plug.

Fig. 1 shows in full lines the position of theplunger when the plug is inserted and the tumbler switch is closed; the positions of'theplunger and of the wing projection of the plug just before the insertion of the latter are shown by the dotted lines.

The helical spring 18 can be replaced by lanother suitable form, for example, by a plug of rubber or other elastic material.

As shown in Fig. 3, when the plug 1 is not in use, the socket can be closed by a metal cap 20 provided with an internal screw thread engaging with the thread on the tube 12.

The modifications shown in Figs. 4 and 5 are suitable for conditions which do not require that the parts should be wateretight. Similar parts are denotedby the same references as in the preceding figures.

In the device shown in Fig. 4, a spring 18 may be inserted in the tube 4 as shown in 1, but this spring may be omitted if the arrangements are such, as shown by the dotted lines, that the full travel of the plunger is completed before the tumbler switch has reached the dead point; in this position the tumbler contacts are engagement,.. but there is a ,torsional stress giving.

a quick release as soon as the plug is removed. i v In Fig. 5 the solid plunger is replaced by a piston 22, to which is attached a rod 23, enlarged at one part into a ring to receive the pip 17 of the tumbler. The rod 23 is shown supported by a guide 24. e

The invention is not limited to the tum bler type of switch, but is applicable to any type of tumbler switch havinga proJecting handle. A

Having thus describedv the nature of the said invention and the best means I know of carrying the saine into practical edect, I claim 1'. In combination, an electric switch, a casing for the switch, a handle operating the switc contacts and projecting throu h the said casing, a wall socket, a plug a apted to engage. in the said socket, a linearly sliding member engaging said handle, and a win on said Yplug adapted on the insertion of the plug in the socket to move said sliding member to close the switch contacts.

2. In. combination, an electric switch, a4

casing for the switch, a handle operating the switch contacts and projecting through the said casing, a wall socket, a plug adapted to engage in the said socket, .a-linearly sliding member engaging said 4handle, a wing` on4 j said plug adapted on'the-insertion of the lug in the soc et to move said sliding mem- Eer to close the switch contacts, and a spring adapted to move said slidingmember in the opposite direction when said plug is withdrawn from the socket.

3. In combination, an electric switch, a casing for the switch, a handle operating the switch contacts and vprojecting through the said casing, a wall socket, a plug adapted to engage in the said socket, a tubular casing, a plun er slidable in said casing, and means associated with said plunger and engaging saidhandle to close the switch contactswhen said plug is inserted in. said socket.

4. In combination, an electric switch, a casing for the switch, ahandle operating the switch contacts and projecting through the said casing, 'a wall socket, a plug' adapted to engage in the said socket, a tubular casing, a

ciated with saidplunger and'engaging said handle to close the switch contacts 'when said plug 'is -inserted in said socket, and a spring in said tubular casing to move the 'plunger and thereby operate the handleto open 4the said contacts.

5. In combination, an receptacle for the switch, a -cover for the top ofthe receptacle having an opening, a`

handle operating the switch and projecting through said opening, a socket on the said cover, -a plugbadapted to 4be inserted in said socket, a tu plunger slidable in said tubular casing and engaging with said handle, and means associated with the plug adapted to 'move said plunger and close said switch whenl the plug is inserted in the socket.

6. In combination, an electric switch, a receptacle for the switch, a cover for the top of the receptacle having an opening, a handle operating the switch and projecting through said. oening, a socket on the said cover, a plug a apted to be inserted in said socket,V a tubular casing on the cover, a plunger 'slidably mounted in said tubular casing and engaging with said handle, 'and a wing on said plug to engage and move said plunger to close said switch when the plug is inserted in the socket.

7. In combination, an electric switch, a receptacle for the switch, a cover for the top of the receptacle having an opening, a handle operating the switc .projecting through said opening, a socket on 'the said cover, a plug adapted to be inserted in said socket, a tubular casin on the cover, a plunger slidably rnounte in said tubular vcasing and engagin lwith said handle, a wing on said plug a apted to engage and move said plunger and close said switch whenl the plug is -inserted in the socket, and a spring in said tubular casing adapted to open the switch when the plug is w1thdrawn from the socket.

In testimony whereof I have signed my name to this specilication in the presence of two subscribing witnesses.

l D. M. EDWARDS.

Witnesses:

C. S. HOPKINS, W. S. Mmmm.

electric switch, a l

ular casing on the cover, a-

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