US753276A - A cobporation of illi - Google Patents

Description

UNITED STATES i Patented March 1, 1904.

PATENT OFFICE. v

DANIEL A. KIMBARK, OF CHICAGO, ILLINOIS, ASSIGNOR TO ELECTRIC SPECIALTY CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI- NOIS.

LA NIP SOCKET AND PLUG.

SPECIFICATION forming part of Letters Patent No. 753,276, dated March 1, 1904.

Application filed May 21, 1902. Serial Ho. 108,313. (No model.)`

To a/ZZ whom, it ,may concermi Be it known that I, DANIEL A. KIMBARK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lamp Sockets and Plugs, of which the followingv is a full, clear, and exact specification.

My invention relates more particularly to that class of lamp sockets and plugs used on lamps known as berth-lights7 and is shown in connection with such; but this is done for convenience of illustration and description, and it will be understood' that the invention is applicable to other uses where plugs and sockets are desirable; and the invention has for its primary object to provide a compact and simple form of plug and .socket of thisgeneral description.

With these ends inview my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by which the said objects and certain other objects hereinafter appearing are attained, all as tully described with reference to the accompanying drawings, and more particularly pointed out in the claims. In the said drawings, Figure 1 is a side elevation of a berth-light, showing the plug and socket in longitudinal section; and Fig.` Q is a transverse sectional view taken on the line 2 2, Fig. 1.

I is the electric light or lamp, which is provided, as usual, with a supporting arm or bracket 2, through which the conductor-wires pass, but which may be regarded as any other electrical appliance to be supplied with current through my improved socket and plug. To the lower end of the arm Eis secured a hub or joint-stock 3, which passes through an open.

number of notches 8, through which the lugs 7 pass when the stock 3 is inserted and when inserted beyond the inner edge of the plate 4 may be turned or rotated so as to engage with such inner face, and thereby lock the stoel; in place, the outer end of the barrel 5 being cut away, as shown at 9, for the movement ofthe pins or lugs 7.

The barrel 5 is formed with a shoulder or internal iiange 10, against which abuts a contact-collar 11, which is connected through the barrel 5 with one of the conductors or linewires 12. One end of the collar 11 is provided with a reduced extension 13, which is considerably thinner than the main portion of the collar, so that the same may be flared outwardly in the formpof'a funnel-shaped mouth for receiving the end of a contact-sleeve 111. This sleeve 14 is also provided with a reduced end or extension 15, which is adjoined to the larger part of the sleeve by a conical-shaped portion 16, and surrounding this reduced extension and conical-shaped portion is an insulating-sleeve 17, which is of substantially the same diameter as the maximum diameter of the contact-sleeve 14. The purpose of this particular formation is to provide for an internal insulating-sleeve 18 in the larger part of sleeve la without necessitating any increase in the diameter of the end 15, thereby allowing room for a second insulating-sleeve 19 to be placed around the reduced end 15 for separating the latter from the joint-stock 3. The sleeves 1 8 and 19 are screw threaded, the former externally and the latter internally, and the larger part of the contact-sleeve 10 screw-threaded internally, while the smaller part 15 screw-threaded externally for receiving these threaded insulating-sleeves. One end of sleeve 18 is' made conical on the exterior, as shown at 20, to lit the conical part 16 internally, and one end of insulating-sleeve 19 is made flaring, so as to it the conical part 20, and thus constitute continuous surfaces on both the interior and exterior of the plug. The joint-stock or hub Slis screw-threaded on the insulating-sleeve 19 and is secured to or formed on the arm or bracket 2 ofthe lampiixture in any suitable Way.

Within the insulation-sleeve 18 is screwed or otherwise secured a housing 21 for a reciprocating plunger 22, adapted to .slide back and forth therein and which when pushed outward impinges against a contact 23, screwed in or otherwise secured to the barrel 5`of the socket and having an aperture 24 or other means for the attachment of one of the wires or conductors 25, the contact 23 being of course insulated from contact-collar 11 by the barrel 5. The plunger contact 22 is thus forced outwardly by means of a coil-spring 26 or other suitable cushion located between the plunger and the inner end of the housing 21 and surroundinga guide-stem 27, formed on or secured to the plunger and passing through the end of the housing 21, which is contracted around the stem to form a shoulder for the abutment of spring 26. One of the conductors (28) is connected to housing 21, arranged within sleeves 15 18 and of course covered with suitable insulation, so as to avoid short-circuiting with sleeve 15.

As shown in Fig. 2, the lugs or pins 7 engage in countersinks or recesses 29 in the back of face-plate 4 after they are inserted and the bracket has been turned upv to its proper position, and the backward push produced by the spring-actuated plunger holds the pins or lugs 7 in the recesses 29, and when the plug is used on a lamp of the character described the pins are thus enabled to hold the lamp in an upright position, and they also prevent it from rattling.

Having thus described my invention, whatI claim as new therein, and desire to secure by Letters Patent, is-

1.' In a device for the purpose described the combination with a socket comprising two insulated contacts,of a plug comprising a springactuated plunger adapted to connect with one of said contacts and a contact adapted to slide over and connect with the other of said contacts and conductors electrically communicating with said contacts and plug respectively, said insulated contacts being arranged successively in the line of movement of the plug whereby the said contact of the plug will slide over one of them while approaching the other and the two may be far removed from each other, substantially as set forth.

2. In a device for the purpose described the combination with a socket comprising two nsulated contacts, of a plug comprising a contact adapted to engage with one of said contacts, a plunger-housing, a plunger in said housing, a contact-sleeve surrounding said housing and insulated therefrom and adapted to engage with the other one of said contacts in the socket, and conductors electrically communicating with said plunger-sleeve and contacts respectively, said insulated contacts being arranged-in succession in the direction of bodily movement of the plug whereby the plug will slide against one while approaching the other and the two may be far removed from each other, substantially as set forth.

3. In a device for the purpose described the combination with a socket comprising two insulated contacts, of a plug comprising a plunger-housing, a plunger in said housing adapted to connect with one of said contacts, a contactsleeve surrounding said housing and insulated therefrom and adapted to engage the other one of said contacts, said sleeve having a reduced end, a joint-stock surrounding said reduced end and insulated therefrom, means in connection with said joint-stock and socket for locking the joint-stock in the socket and conductors electrically communicating with said plunger, sleeve and contacts respectively, substantially as set forth.

4. In a device for the purpose described the combination with a socket comprising two insulated contacts, of a plug comprising a plunger-housing, a plunger in said housing adapted to engage one of said contacts, a contactsleeve surrounding said housing and insulated from said plunger and adapted to engage the other one of said contacts, said sleeve having a reduced end, an insulating-sleeve surrounding said reduced end, a joint-stock surrounding said insulating-sleeve, and means in connection with said joint-stock and socket for locking the joint-stock in the socket, and conductors electrically communicating with said plunger, sleeve and contacts respectively, substantially as set forth.

5. In a device for the purpose described the combination with a socket comprising two insulated contacts, of a plug comprising a plunger-housing', a plunger in said housing adapted to engage one of said contacts, a contactsleeve surrounding said housing and insulated fromsaid plunger and adapted to engage the other one of said contacts, said contact-sleeve having a reduced end, an insulating-sleeve secured on said reduced end and being of substantially the same diameter as said contactsleeve, a joint-stock secured on said insulating-sleeve and means in connection with said joint-stock and socket for locking the jointstock in the socket and conductors electrically communicating with said plunger, contactsleeve and contacts respectively, substantially as set forth.

6. In a device for the purpose described the combination with a socket comprising two insulated contacts and a face-plate secured to said socket and having a passage for a plug provided in its edge with one or more notches, of a plug comprising` two contacts adapted to engage with the aforesaid contacts respectively and one or more pins radiating from said plug and adapted to pass through said notches and engage behind said face-plate for locking the plug in the socket, substantially as set forth.

7. In a device for the purpose described the combination with a socket comprising two in- IOO IIO

sulated contacts, of a plug comprising a plunger-housing, a spring-actuated plunger in said housing', an insulating-sleeve surrounding said housing and having a tapered end, a contactsleeve surrounding said insulating-sleeve and adapted to contact with one of the aforesaid contacts and having a reduced end and a tal pered portion joining said reduced end to the main portion thereof, an insulating-sleeve surrounding said reduced end, a joint-stock surrounding said second insulating sleeve, and means in connection with said joint-stock for securing the plug in said socket, and conductors electrically communicating With said plunger and contacts respectively, substantially as set forth.

F. A. Horms, W. D. CROSS.

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