US1717525A - Lamp - Google Patents

Description

June 18, 1929.

E. E. SLICK LAMP Filed Nov. 28, 1925 2 Shets-Sheet l W (9 IINVE%TO R June 18, 1929. s c 1,717.525

Filed Nov. 28, 1925 2 Sheets-Sheet 2 w p MN Ax v QM Nv N WW WWW ME MM mum, mm, 4 QW NM.

Patented June 18, 1929.

UNHTED STATES EDWIN E. SLICK, O1? PITTSBURGH, PENNSYLVANIA.

LAMP.

Application filed November 28, 1925. Serial No. 71,921..

The present invention relates to a lamp and the process of manufacture, and more especially to an electric lamp made from glass and designed foruse as a table lamp.

The object of the invention is to simplify and cheapen the cost of lamps of'this character and particularly the base portion and the electric connections. With this object in view, the invention consists in the combinations and arrangements of parts and the process, as hereinafter described and more particularly pointed out, the advantages of which will be apparent to those skilled in the art from the following description.

In the drawings Figure 1 is a central vertical section through a lamp embodying my invention;

Figure 2 is a perspective view showing the insertible electric connection;

Figure 8 is a view similar to Figure 2, but showing a modification;

Figure 4c is a central vertical sect1on through the press mold, showing the pressing of the base; and f Figure 5 is a similar view through the blow mold, showing the blowing of the base.

Referring to the embodiment of theinvention illustrated in the drawings, the lamp consists of two glass parts, a base 1 and a shade 2. The base 1 consists of a pedestal portion 3 and a flange 4 formed integral therewith. The flange lextends outwardly from around the electric lamp socket 5. The edge of the flange is provided with three lugs 6 which engage the shoulder 7 of the shade 2 so as to leave air ventilating spaces 8 between the shade 2 and. the supporting flange 4.

The shade and the base and more especially the flange l are made of translucent glass. The shade and base are preferably finished with an etched or sand blasted surface on the outside, and may bear other decorations if desired.

The electric lamp socket 5 consists of a threaded metal shell 9 into which the electric lamp 10 is screwed. The lower end of the shell. has an inwardly extending flange 11 through which is formed a relatively large hole 12. The shell 9 is preferably secured in the base by casting it into the glass during the molding operation of the base, although it may be otherwise secured as by cement. The electrical connections are thereafter inserted. These connections are shown in Figure 2 and modification in Figure 3. The connections consist of an insulating disc 13 having a cen tral lamp engagingcontact 14 to which is soldered one of the leading in wires 15. The connection is made from the other leading in wire to the shell 9 by meansof a conducting ring 17 to which the leading inwire 16. is soldered as shown in Figure 2. The ring 17 lies in contact with the flange 11 and is supported thereby. The ring 17 is preferably formed with a U-shaped cross section as shown in Figures land 2, so as to be burnished around the edge of the insulating disc 13.

The ring 17 may, however, be made as a plain flat ring as indicated at 17 a 111 Figure 3, so as to lie between insulating disc 18 and the flange 11. l In assembling the lamp, theelectric wires 15 and 16, which are preferably bound together in a lamp cord 18, are inserted through the shell 19 and the insulating disc andconducting ring 17 are drawn into place as shown in Figure 1. The form ofsoeket and its electric connections not only allows it to be used where the socket is to be cast in, butis a very cheap construction to make. The electric lamp socket, whiledesigned particularly for use in lamps of this character in which the shell is cast in with the glass during the pressing operation, may have other applications.

The lamp is formed with a tapered .recess or depression below the open end of the socket shell 9, the recess tapering from a diameter ap- I proximately equal to that of the hole 12 through the bottom of the shell 9 to a smaller diameter at the neck 20. This enlarged re cess 19 allows sufiicient room for the wires which separate andeXtend to the conducting terminal through the insulating disc and to the contact ring 17. The pedestal of the lamp is hollow and has the opening 21 which extends to the recess 19, and allows the passage of the lamp cord 18 through the base of the lamp. The bottom of the lamp is preferably formed with short lugs 22 which provide clearance spaces 23 for the en'iergence of the lamp cord 18.

The process of forn'iing the base portion of the lamp is illustrated in Figures 4 and 5. In Figure 4, reference numerals 30 and 31 designate the two halves of a press mold in which the base is pressed. The bottom-of the press mold is closed by the bottom mold member 32 having an upwardly extending plunger 33 vwhich is designed to carry the socket shell 9. The upper end of the plunger is formedwith a shoulder 34 which. engages the,v

flange 11 of the shell 9 and prevents glass plungeris preferably formed with a tapered from beingpressed beyond it into theintes rior of the shell 9. The upper end of the extension 35 which extends through'the hole 12 in the shell and'forms the tapered recess 19 of the'completed lamp. The plunger 33 is smooth and has an easy fit in the shell 9 so i that it may be readily withdrawn therefrom.

The mold parts 30, 31 and 32 have formed between them the recess in which the shade carrying flange t is formed during the pressing operation. In 't'orming the lamp, 2. gob of glass is dropped into the open top of the I the plunger 33 or into close contact therewith,

mold and then a pressing plunger 36 descends to press the glass, as shown in Figure 4. The

plunger 36 has a reduced lower end 37 which is brought either against the upper end of leaving a very thin web ofglass 38 which can be easily punched or broken out to open the passage for the lamp cord connection.

The mold has a ring 39 through which the plunger--36 moves and which forms the legs 22 at the bottom of the base.

The lamp, as pressed, may be used directly.

However, it may be desired to give the base an enlarged contourby means of a blowing operatlon which is indicated 1n Figure 5. To carryout this blOWlIlg operation, the separable mold halves and 31 are removed and xseparable blow molds 40 and 41 are placed around the pressed blank. A blow head 42 having a ring 43 is then applied to the pressed blank and the glass blown into the form shown in Figures 5 and 1. V

The plunger 33 notonly holds the shell so that it is cast into the glass, but it closes the inner open end of the shell and also forms the recess 19 extending beyond the shell. The

plunger 33 and 36"cooperate to either form a completed passage to the shell through the hollow base of the lamp, or at most leave such passage obstructed by a very thin web 38 which can be readily punched out without danger of breaking the base, when the electric wire connections are to be inserted.

The base, after the pressing or blowing operations, has the electric lamp socket cast therein and also has the shade supporting flange 4 formed integrally with the pedestal portion of the base. The base portion and shade supporting flange, excepti'or the draw- ;ing in of the electric wiring, is therefore completely formed as an integral unit, and with 'the added shade forms a two-piece glass lamp which is not only attractive in appearance but which can be manufactured at a very low cost.

lVhile I have specifically described and illustrated the preferred embodiment of my invention, it is to be understood that the inand a lamp socket in the base comprising a metallic shell secured inqthe base and having an open bottom surrounded by an inwardly extending flange and plate of insulating material carrying a lampcontact inserted in the shelland retained by the flange.

3. An electric lamp comprising a glass base anda lamp socket in the base comprising a metallic shell secured in the baseand having an open bottom surrounded by an inwardly extending flange, a metal contact ring fitting against the flange and adapted to receive a connecting'wire and a plate of insulating material placed over the metal ring and having a central'lamp contact adapted to receive another conducting wire, said plate and ring beinginserted into the metallic shell within the base.

In testimony whereof I my hand.

have hereunto set EDWIN E. SLICK.

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