US1043380A - Lamp-socket. - Google Patents

Description

Patented Nov. 5, 1912.

H. C. WIRT L F. W. SANFORD.

y LAMP SOCKET.

APPLICATION FILED JUNI: 22, 1909.

rain srafrns rarnivr HERBERT C. WIRT, 0F PLYMOUTH, MASSACHUSETTS, `AND FRANKW. SANFORD, 0F

` CHICAGO, ILLINOIS.

LAMP-SOCKET.

Specification of Letters Patent.

Patented Nov. 5, MM2.

Application led June 22, 19Q8. Serial No. 439,705.

senting like parts.

This invention relates to lamp sockets and has for its objects to provide a novel means` l is attached and which is electrically confor retaining the. cap to the shell of the socket and also to provide a novel manner of mounting the circuit terminals on the porcelain base. 4

In accordance with our invention the cap is held to the shell of the socket by providing one of the parts on opposite sides with projections of uniform cross-sectional area throughout their length, which projections enter apertures in the other part. This construction not only securely holds the tw'o parts together, but prevents one part from turning on the other. The porcelain base of the socket is made in two sections, each of which is provided' with cavities or recesses having such a relation to each other that when the sections are in position, suitable chambers are formed `for receiving `the switch mechanism and the circuit terminals. Both the switch mechanism and the circuit terminals are mounted on.the lower section of the base and means separateffrom said terminals and switch mechanism is provided for securing the two sect-ions together.

The novel features wherein our invention resides will be more fully-hereinafter described and then pointed out in the appended claims.

Inpthe drawings wherein wehave illustrated one embodiment of our invention, Figure l is a side viewof a socket 'embodying the invention; Fig. 2 is an enlarged sec- -tional view on the line. :v -m, Fig. 1; Fig. 3

hicago,vcounty of Cook, and State off Illinois, respectively, have invented an Im. provement in Lamp-qockets, of which thei following description, in connection with; the accompanying drawing, isa specification, like characters on the drawing repre-l section on line a-a, Fig. 4; Fig. 7 i's a sectional view of the cap and shell showing the manner of removing the cap.

3 'is the shell of the socket and 4 the cap. thereof. Situated within the shell is the usual porcelain base which 4sustains the switch contacts 5 and 6, the contact 5 being electrically connected with a circuit terminal 8 to which one of the conducting wires may be attached, and the contact 61 being electrically connected to the usual center lamp terminal 9. `90 isv the second circuit terminal to which the other conducting wire nected with the screw shell 91. These are the parts which are commonly found in lamp sockets. y

One feature of our invention relates to the manner in'which the shell and the ca are secured together. In accordance wit this feature of the invention, either the cap or the shell has extending therefrom on 'oppcsite sides thereof projections 10 which are received in apertures 11 formed in the other part. In the present embodiment of our invention the projections are carried by the shell and the apertures are formed in the cap.

We prefer to make the projections 10 of Isubstantially uniform cross sectional area throughout their length and also to make them with all thesides thereof extendmg substantially, at right angles to the wall of drical as shown in the drawing, in which case the apertures 11 will have a corresponding shape. The shell is slightly larger than the porcelain base so that it 1s ossible 4to portion of the porcelain base; Fig. 6 is a y press `the side of the shell inward y adjacent l either one of the projections 10 suiiciently to withdraw the projection from the aperture 11 and then to separate the cap and the shell at this side. The projections 10 eX- tend radially so that the side walls thereof are perpendicular to the shell and form square shoulders for engagement with the walls of the apertures 11. As a result when the cap and the shell are locked together, it will beimpossible either to turn the cap with relation to the shell or to separate the cap from the shell by a longitudinal movement without first pushing inwardly on the side of the shell adjacent the cap, as seen in Fig. 7, to withdraw the projection from the aperture. These projections 10 ma be either formed bystriking up Vthe material of the shell or may be in the form of pins or other projections secured to the shell.

, One advantage of our present construction is that the projections and apertures may be placed at any desired points on the shell and cap. We prefer to place them opposite cach other, although this is not essential to the invention. We prefer also to so place them that a line connecting them extends at right angles to the key shaft 18. The advantage ot this construction is .that the strain or twisting action produced by 'the turning of the key 19 will not tend to disconnect the shell from the cap as might be the case if the projections were arranged in substantially the same plane as the key. The twisting strain to which the socket is subjected when the key is turned would tend to turn the shell relative to the ca about the axis of the key, and it will be -o vious that l this strain can be much better resisted when vto the projections are placed at right angles to the axis of the key.

The procelain base which supports the Acircuit terminals and switch contacts coinprises the two members 14 and 15 which are shown as being clamped together when in operative position by means of a clamp- 'i'ng bolt 16 that passesthrough the two members. The key shaft 18 carries the usual switch cam 7 and is provided at its end with a thumb piece or key 19. The shaft 18 is journaled in a bearing formed partly in each of the two members 14 and 15, said shaft being held in place between the two meinbers when the latter are clamped together by the bolt 16.

One feature of our invention relates to the manner in which the contacts and terminals are supported and according to this feature both contacts and both terminals 8 and 90 are supported entirely on the lower member 14 of the porcelain base. The member 14 is provided with the recess 20'in which the contacts are partially' received, and the member 15'is provided with an alined recess 21 which when the two members 14 and 15 are together forms with the recess 2O a cavity to receive both the switch contacts 5 and 6, as clearly seen in Fig. 2. The contact 6 is formed from a strip which is bent into V-shape and one arm of Which'is provided with the foot 40 which rests on the bottom of the recess 20 and through which the lamp terminal or stud 9 passes, said foot being held frml in placeby the head 41 formed on or app ied to the stud.

The contact 5 is held in position by a incasso clamping screw 24 which enters the member 14 from the bottom, as seen in Fig. 2, and the' same screw 24 screws into4 the terminal 8 and secures it in place.

IThe cap portion 15 of the porcelain base is provided with a side recess 26 in which the terminal 8 is received and in which the conducting wire leading to thev terminal 8 is also received. This side recess 26 leads into and connects with the 'recess or cavity 21 and the cap member 15 is pre-ferably made with a notch 44 to receive the upper end of the terminal 8, (see Fig. 2).

The terminal 90 is secured to the lower portion 14 of the porcelain base by a suitable screw 93 .(see Fig. 6) which passes through the screw shell 91 and thus electrically connects said terminal to the shell as well as securing the-terminal to the part 14 of the porcelain base. The cap portion 15 of the orcelain base is made with the recess 27 in which the terminal 90 is received. v

It will thus be seen that all the securing means for the terminals and contacts are located in the section 14 of the porcelain base and that the cap portion 15 can be re moved without disturbing any of these securing means.- It is possible, therefore, to remove the cap 4 and then to remove the clamping bolt 16 and the cap portion 15 of the porcelain base thereby to gain access to the terminals and the contacts without disturbing any of the devices used to secure said terminals and contacts'in their proper position.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent is A 1. In a lamp socket, the combination with a shell, of a cap, and means foi-,securing the cap and shell together comprising two radially-extending projections rigid .with one of said parts, the other art having apertures toreceivesaid projections, each projection having its side walls perpendicular to the walls of the part 'from which it extends and the walls of said parts adjacent one of said projections being capable of radial movement relative to each other to permit engagement and disengagement of the projections with the apertures, the perpendicular side walls of the projections preventing turning movement of the parts relative to each other.

2. In aA lamp socket, the combination with a shell having ri id therewith two oppositely-disposed cy indrical projections, the wall of the lamp socket adjacent one of the projections being capable of being pressed inwardly, of a cap for the socket, the portion of the cap which embraces the socket being imperforate except for two apertures adapt ed to receive the projections.'

3. 1n a lamp socket, the combination with a shell having rigid therewith two opponames to this specication in the presence sitfleily-diposed cyllidricil progections, ang of two subscribing Witnesses. a e s ot situate mi Wa etween sai v projejctions, of a cap Afor they shell, the por 5 tion 'of the cap which embraces the shell being imperforate except for two apertures Witnesses: which receive said projections. v LOUIS C. SMITH,

In testimony whereof we have signed our THOMAS J. DRUMMOND.

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