US2190834A - Lamp holder - Google Patents

Description

Feb. 20, 1940. J. GLAss'BERG LAMP HOLDER Filed May 17, 1938 2 Sheets-Sheetv l Feb. 2o, 1,940. GLASSBERG 2,190,834

LAMP HOLDER Y Filed May 1'17, 1938 2 Sheets-Sheet 2 ATTORNEY Patented Feb. 20, 1940 UNITED STATES .Partnr ori-ics LAMP` HOLDER Jacob GlassbergJ Hillside, Nul., assigner to Sam` son Investment Co., a` corporation of New Jersey Application May 17, 1938, Serial No. 2085382 1 Claim.l

This inventionV relates to holders or sockets for incandescent lamps, and more particularly to a socket or holder located in` a predetermined position with respect to a lens, reflector, refractor or other optical device. In one of its more specic aspects the invention is directed to a Figure 2is a cross-sectional view taken on line 2 2 of Figure l in the direction of the arrows.

Figure 3 is a fragment of an enlarged cross-` sectional View illustrating the relationship and manner of connecting a contact to the socketk chamber. r

Figure 4 is a top plan view of my improved holder.

Figure 5 is a cross-sectional view taken on line 5--5 of Figure 4.

Figure 6 is a plan View of the holder shown in Figure 5, but inverted.

Figure 7 is a vertical cross-sectional view of the holder and lamp base.

Figure 8 is a View in perspective of the lamp, base, holder and contact terminal, one above the other.

As shown `in the drawings, there is a lamp chamber or housing I0 open at the top and bottom so that a lamp I may be inserted therethrough. The lamp I is a prefocused lamp and maycomprise an envelope 2, a lament 3, and a base 4. Secured to the base are a pair of outwardly extending arcuate wings or lugs 5 and li.

The radius of the outer periphery of the wings i are equal, but the length of the arc of the outer periphery of the wings are dissimilar. The wings 5 and 6 are located at a predetermined distance and in a predetermined plane with respect to the filament 3, and bear the same angular relation to the filament, so one lamp may be replaced by` `face of ring I4.

of the housing I2 is greater than the outside diameter of the envelope of the lamp I. The interior of the housing l2 has a cylindrical recess extending from its 1bottom edge up to a point located an appreciable distance from said edge and defines a downwardly facing annular hat` shoulder i3 perpendicular to the axis of the chamber' I2.

A contact and locating annulus or ring I4 of Conducting materialhas a locating notch or slot ll:

l5 in the outer periphery thereof. The outside diameter of the ring i4 is slightly less than the outside diameter of the shoulder I3. Thering ifi is located in said chamber I2 and its upper V face is held in abutting relation with shoulderl' I3 by stud bolts It whose conical heads are located in countersinks and above the lower flat The chamberIZ has an elongated locating and positioning slot or recess Il therein extending upwardly from the shoulder gg I3 and this slot or recess Il bears a predetermined relationship with respect to a lens or other optical device which may be supported by chamber It. The ring I4 is so disposed on the shoulder I3 that the notch or slot I5 is in alignment with 25 the elongated slot Il in chamber I2 and the cross-sectional dimensions of the latter are slightly greater than the corresponding dimensions of the former. `The inside diameter of the ring I4 is approximately the same as the inside diameter of shoulder I3. A stud bolt I8 carrying a conductor I9 from a source of electric energy extends through the housing l2 and into the contact I4 to make electrical connection therewith.

As shown inFigures 4, 5, 6 and 8 there is a holder comprising a flat annulus or ring conductor 2i) having an upwardly extending key or lug 2l integral therewith at its outer periphery. The `cross-sectional dimensions of the key 2| 40 are slightly less than the corresponding dimensions of the locating notch or slot I5, and the length of said key 2| is less than the length of recess I'I so that the key may passupwardly through notch I5 and into the recess II.

The ouside diameter of ring 20 may be slightly less than the outside diameter of shoulder i3 and its inside diameter is just slightly greater than the cylindrical base l of the lamp I so that the same may pass therethrough. A rigid and thin short cylinder 22 having an outwardly extending flange 23 and an inwardly extending flange 2li is ccaxially disposed relative to the ring 20 and is rigidly secured thereto by rivets-passing through the ring 2li and iiange 23. The outside 55 diameter of the cylinder 22 is slightly less than the inside diameter of the ring I4 so that the same may be located in the opening of ring I4. The inside diameter of the ange 24 is the same as the inside diameter of the ring 2U, and the inside diameter of the cylinder 22 is slightly greater than the corresponding dimension between the wings and 5 of the base of the lamp. A pair of unequal openings 25. and 26 are cut out of the flange 24 and are of approximately the same size as the wings on the lamp I, with the opening 25 being narrower than wing 6, and are spaced from. each other as are saidwings so that the lamp may be inserted therein in one way only. And the openings are always located in the same and in a predetermined relationship with respect to the key 2 I. Struck out of said annular ring 2e are a pair of retaining or locking strips 27 `whose free ends 28 are bent upwardly and extend into slots or openings 29 in the flange 24. That portion of each strip under one extremity of the wing shaped openings in flange 24 is inclined gradually upward to the lower face of ilange 24 then extends along said lower face and is contiguous therewith from the cam or incline portion thereof to the short upwardly projecting portion of stop 28 which extends through the slot 29.

lThe shape of the upper face of ,each spring retaining or locking strip 2l are complements of the lower faces of the wings and the inner extremities of the strips 21 may be spaced a slight distance from the inner face of cylinder 22 so that the downwardly curved outer portion of the wings may make a snug fit therebetween.

The position of the stops with respect to the key 2l is always the same and predetermined in order that the position of `the filament of the lamp may always be the samey with respect to Q the key 2l and consequently with respect to the optical device.

The holder unit may be readily secured in the chamber I2 by inserting the key 2I through the opening I5 in the contact ring I4 and up into the elongated recess Il in the side of the chamber.

The holder unit is forced upwardly until the upper face of the annular member 23 abuts against the under face of the contact annulus Ml. And, in this position, the cylinder 22 is located in the central openingv of the annular member I4.

A sleeve 3d is located in the chamber I2! and may be demountable or may be keyed to the chamber and maintains the holder unit in a xed position against annular member I4. A closure plug 3I having a contact member 32 secured thereto makes electrical connection between the end terminal of the lamp and the ring 33, connected to a conducting wire 34 by bolt 35. Besides having the advantage of ready assembly with a supporting structure, it is apparent that even an unskilled workman must properly position the same and lamp may be replaced without disturbing an element other than the removal of the burned-out lamp.

When it is desired to mount the lamp in the chamber, the lamp with base down is inserted through the top of the chamber and the base extendsy through the opening of the holder, the lamp is rotated until the wings 5 and 6 are located in the openings 25 and 2B. The lamp is further rotated and upon rotation the wings ride up along the cam portions of the lock springs 2l and as they reach the under face of flange 24 cause the spring to be forced away from the flange 24 and this rotation is continued until the leading edges of the wings 5 and 6 strike the` stops 28 to locate the lamp in a predetermined position. lamp in this fixed position. When it is desired to remove the lamp, the operator inserts his hand through the top of the chamber and counter rotates the lamp to remove the wings from between the spring retainers and the ange 24 and locate the Wings in the openings in the flange 24 whereby the lamp may be withdrawn therefrom and a new lamp may be substituted therefor( Although, the invention has been described in detail, it is not to be limited thereby because it is subject to changes and modications within its scope.

I claim:

An incandescent lamp holder comprising an annular conducting member, a lug secured thereto adjacent the outer periphery thereof and extending upwardly therefrom, a collar secured to said annular member, a ange extending inwardly from said collar and spaced from said annular member, said ange havinga pair of unequally spaced openings therein, a pair of resilient retaining strips rstruck out of said an nular member and normally exerting force in a direction therefrom and towards said iiange, and a pair of stops located between said member and said flange.

JACOB GLASSBERG.

The springs 2l maintain the

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