US1245068A - Attachment-plug fitting. - Google Patents

Description

G. B THOMAS.

ATTACHMENT PLUG FTTTING.

APPLICATION FILED APR.10. 19m.

1,245,068., Patentd Oct. 30,1917.

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GEORGE B. THOMAS, 011' BRIDGEPORT, CONNECTICUT, ASSIGNOB TO THE BRYANT ELEG- TRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

ATTACHMENT-PLUG FITTING.

Specification of Letters Patent.

Patented Oct. so, 1917.

Application filed April 10, 1916. Serial No. 90,167.

tacle with a signal device operated by theinsertion of the plug.

Referring to the. accompanying drawings,

Figure 1 is a perspective of a fitting in which my invention is embodied in one form;

Fig. 2 is a perspective of a detail;

Fig. 3 is a longitudinal section through the fitting; and t Fig. 4 is a plan with they cover plate removed.

With the increasing utilization of electricity for energizing domestic utensils of one sort or another and the consequent distribution of electrical implements among those unfamiliar with the dangers attendant upon their use, it becomes more and more important to surround these utensils with every possible safeguard against accident. One of the commonest sources of danger, for instance with electric fiat-irons or other resistance implements, is the possibility of the switch which controls the heating coil being turned on by any careless or mischievous person or child while the implement is in contact with, inflammable material. The safest way to i'meet this danger is to provide an alarm which notifies the user of the implement to break the connection. with the line circuit at the receptacle when the use of the implement has been completed.

For this purpose I have devised an attachment plug receptacle having associated therewith an alarm or indicator which is actuated upon the insertion of the attachment plug and thus warns the user of the danger which resides in leaving the attach ment plug inserted and thus prompts the user to withdraw the plug and thus break 7 the line connection at the receptacle. In the form here shown the present receptacle comprises an insulating body 10 of duplex-gang construction. Its interior comprises two chambers, one to receive the attachment plug 11, and the other to receive the lamp 12. The receptacle is covered by a face plate 13 having a plug-receiving aperture normally closed by the doors 14, while a bulls-eye 15 overlies the lamp 12. Within the plug-receiving chamber are the receptacle contacts in the form of studs 16 and 17 respectively connected by base straps 18 to their binding screws 19 and 20 which lie on v depressed ledges 21 and 22 at diagonally opposite corners of the receptacle chamber. An insulating lining 23 overlies the straps 18 and extends upward beyond the ledges 21 and 22 thus protecting the interior of the receptacle against stray wire beards.

In the adjacent chamber of the receptacle are arranged the terminals 24 and 25 for the lamp 12. The terminal 24 is directly connected with the binding screw 19 by means of the strap 26 which is let into the lower face of the base and connected at its opposite end to the strap 18 of the binding 'screw 19. Thelamp terminal 25 is provided with a spring bar 27 lying in a channel 28 in the base and extending into the plug receptacle chamber where it overlies and is normally spaced from a cooperating spring plate 29 secured at 30 to the base strap 18 of the binding screw 20. Under normal conditions the spring plates .27 and 29 are spaced apart, as indicated in Fig. 2. Upon the insertion of the attachment plug 11, however, the entering end of the plu engages the free end of the spring plate 2 and depresses the latter into engagement with the cooperating spring plate 29 (Fig. 3). The lamp 12 is thus connected in parallel with the plug circuit and remains lighted as long as the attachment plug is inserted in the receptacle, thus giving a warning indication that the plug shoul be withdrawn from the receptacle to break the line connection at this point.

The particular form of the contacts 27 and 29 will of course be changed to suit various forms of attachment plug and the arrangement of the parts may be variously modified without departing from what I claim, as my invention.

I claim as my invention 1. An attachment plug receptacle comprising a plug-receiving chamber, an electrically operated indicator adapted to be connected in parallel with the plug circuit connected in parallel with the plug circuit and spaced spring contacts in one branch of the indicator circuit automatically operated upon the insertion of the plug to establish the indicator circuit.

3. An attachment plug receptacle coinprising plug receptacle contacts, an asso ciated signaling device having in one branch ofits circuit a pair of normally spaced contacts and means automatically operated by the insertion of the plug for closing said contacts to energize said signaling device.

4. In an attachment plug receptacle an insulating base having adjoining chambers, plug-receiving contacts in one chamber, lamp-receiving contacts in the other chamber, a permanent connection between one or" the lamp contacts and one of the receptacle contacts and a pair of normally separated superposed straps adapted to be brought into contact by the insertion of an attachment plug in the receptacle. 7

5. An attachment plug receptacle comprising wire terminals, plug receiving contacts electrically connected thereto, associated signal lamp terminals, one of said terminals losing permanently connected in the circuit of one ct said receptacle terminals, and the other or" said lamp terminals 7. ln an attachment plug receptacle a wire terminal strap having an ofiset base,

a plug receptacle terminal permanently connected to said base, a spring terminal electrically connected to said base, an associated lamp terminal and a spring arm, extending therefrom into proximity to the receptacle terminal and normally spaced from said spring connector, but adapted to be moved into engagement therewith by the entering end of an attachment plug when the latter is brought into engagement with the receptacle terminal.

In testimony whereof l have signed my name to this specification, in the presence of two subscribing witnesses.

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