US2298758A

US2298758A - Portable electric lamp

Info

Publication number: US2298758A
Application number: US388726A
Authority: US
Inventors: Fred V Fischer
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-04-16
Filing date: 1941-04-16
Publication date: 1942-10-13
Anticipated expiration: 1959-10-13

Description

oa. 13, 1942. F. v. FISCHER 2,298,758

PORTABLE ELECTRIC LAMP Filed April 16', 1941 f2 sheets-sheet 1 l l l Odi. 13, 1942. F, v FISCHER 2,298,758

PORTABLE ELECTRIC L'AMP Filed Aprill 16, 1941 Y 2 Sheets-Sheet 2 416 Zh We?? a? n w v 4f fred Jef' lclamp therefor;

Patented Oct. 13, 1942 UNITED STATES PATENT OFFICE PORTABLE ELECTRIC LAMP Fred v. Fischer, omaha., Neb1-. Application April 1s, 1941, serial' Nascanna (ci. 24o-452.1)

7 Claims.

It is an object of my invention to provide a i simple and durable portable electric lamp which may be quickly assembled and conveniently removably clampingly attached to various objects, posts, or xed supports to provide a conveniently supported light for workers in various arts, or for use by invalids confined to beds, since my improved clamp may be attached to objects, posts or members of round or rectangular shape.

Another object of my invention resides in the novel and inexpensive clamp which may be formed of suitable at metal or wire and preferably of a single piece of flat spring steel to which an electric lamp socket may be conveniently and adjustably attached or to which clamp may be attached an electric light fixture composed of two spaced parts having an interconnecting coil spring between such parts adapted to exert pressure upon the clamp to afford its detachable securement to curved or flat surfaces of objects or posts or various fixed members for convenient support thereon.

The invention also has for its object to provide an adjustable clamp for an electric light fixture wherein such clamp is composed of two separate comparatively stiff metallic Wire members which are supported on relatively spaced resiliently supported parts or members of the electric light fixture.

A further object of my invention finds embodiment in the construction and formation of a unitary clamp wherein the clamp members are an integral part of the ends of a resilient member or portion supported on relatively spaced parts of .the electric light fixture.

With the above and other objects in view, my invention consists in the novel combination, construction and arrangement of theY parts and members shown in preferred embodiment in the attached drawings, described in the following specification and particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a side elevation of an electric lamp support embodying my invention;

Fig. 2 is a longitudinal section through the electric lamp support shown inFig. l;

Fig. 3 is a cross-section taken on line 3--3 of lamp support` showing a modification of the Fig. 2; Fig. 4 is aside elevation of an electric Fig. 5 is a cross-section taken on line 5-5 of Fig. 4;

Fig. 6 is a side elevation of a modied electric lamp support including a unitary clamp embodying my invention;

Fig. '7 is an end view of the clamp shown in Fig. 6; l Fig. 8 is a side view of another modified electric lamp support embodying my invention;

Fig. 9 is an end view of the clamp shown in Fig. 8; and

Fig. 10 is a cross-section taken on line IIJ--IIJ of Fig. 8. j

Asshown in Figs. 1, 2 and 3, the electric lamp support consists of an electric lamp socket I0 for the electric light bulb II, a coil spring I2 having one end supported on said light bulb socket lo, a tubular support I3 for the other end of the coil spring I2, and al clamp I4 composed of spaced identical clamp members I5, one supported on the electric light bulb socket IIl and the other supported onV the tubular support I3.

' As shown in Figs. 1, 2 and 3, the electric light bulb socket I0 is provided withthe usual screw connections i6 forthetwo leads of the electric current conductor I'I which extends into the open end I8 of the socket I0 and which open end is of decreased diameter and exteriorly threaded to receive the interiorly threaded tubular cap I9 for screw-connection thereon.

. The socket I0 is formed with a shoulder 20 against which the cap I5 is screw-mounted to provide an annular groove 2I between the circular flange 22 of the socket IIJ and the ange 23 of the cap I9.

The tubular coil-spring-support I3 is also, like the socket I0, provided with a cap 24 which is screw-mounted on an exteriorly threaded portion 26 of decreased diameter. The spring support I3 is provided with a shoulder 25 which provides an abutment for the cap 24 whereby the circular flange 21 of the cap 24 and the circular flange 28 of the support I3 are maintained in relatively spaced position to provide an annular groove 29 therebetween.

The electric current conductor Il, which conducts an electric current from any source of electric power such as a power line or battery, extends through aligned centrally disposed passages extending through the support I3 and cap 2'4.

i The exterior faces of the caps I9 and 24 are each formed with a spiral groove 30 to receive therein the end portions of the coi1 spring I2.

The socket I0 and the support I3 are both formed with an integral lug 3I disposed within respectively the grooves 2l and 29 which lugs function to prevent rotation of the clamps I5 relatively to the socket II] and support I3.

As shown in Figs. 1 and 3J the clamp I4 consi-sts of two like clamping members I5, one mounted on the socket I and the other mounted on the spring support I3.

Each clamp member I is fabricated from a comparatively stiff piece of elongated metal prefo erably of round cross-section, and each clamp I5 is formed with a circular portion 32 at one end thereof which is adapted to be positioned in one of the grooves 2I or 29 for support therein.

It will be noted that the opening in the circular looped end 32 is not completely closed, vthat is, the terminal 33 is spaced from the curved portion 34 a distance to clear the lug 3I so that the lug 3I interts between the terminal 33 and the curved portion 34 to thereby prevent rotation of the clamps I5 relatively to the socket I0 and spring-support member I3.

The medial portion of each of the clamps I5 is provided with a curved or arcuate portion 35 which adapts the clamps I5 to engagement with and about objects having a curved surface, as for example, a round post 40 indicated by the broken lines in Fig. 1. The clamps may be somewhat strengthened by interposing a slight curve 36 in a reverse direction to the curve of the portion 35.

The free ends of the clamps I5 are flattened, as at 31, and straightened out to form opposed flat gripping faces, and such faces are preferably covered with felt or cork pads 38 to increase their frictional gripping or holding action when the lamp is clamped to a pair of opposed flat faces of an object 39 indicated by the dot and dash lines in Fig. 1.

In the modification shown in Figs. 4 and 5, the coil spring I2 and the clamps I5 are combined in one unit, that is, the clamps I5 are formed from or in extended end portions of spring I2 and are therefore integral therewith.

The formation or structure" of the spring end clamp portions, generally indicated by 4I, is the same as those above-described.

In the modification shown in Figs. 4 and 5, there is no necessity for providing the socket I0 and spring-supporting members I3 with separate caps I9 and 24 and therefore, the socket Ill and the support I3 may each be'formed` or cast or molded in one piece but each provided with `a pair of spaced

circular flanges

42 and 43 for retaining therebetween the clamp portions 4I of the spring.

Since the clamps and spring are formed integral with each other, the flanges 43 are each provided with a diagonal groove 44 to receive the end convolutions of the spring portion 4IA.

The lugs l3I are also dispensed with in the socket I Il and support I3 of the modification in Figs. 4 and 5.

The electric lamp or bulb II may be provided with any suitable type of reflector. The reflector 45 shown in Fig. 1 is provided with resilient prongs 46 adapted to embrace the socket Ii) for support of the reflector 45. y

The modification of my clamp shown inFigs. 6 and '1 is somewhat similar to that shown in Figs. 4 and 5 except that the medial coiled spring portion 4IA is dispensed with by providing the looped portions 4IB'with -upwardly extended integral portions 4IC. The extensions 4IC are bent back :upon themselves orextended in lreverse direction to provide double thickness in the form of spaced clamp handles 41 and the doubled portions are preferably flattened as clearly shown in Fig. 7.

The medial portion 4ID, which is also preferably flattened, is formed as an integral part with the clamp portions 4IC and is curved to provide spring action between the clamp portions 4I when the handles 41 are pressed toward one another to spread the clamping ends 4I.

The modification shown in Figs. 6 and 7 substitutes a flat arcuate spring portion 4ID for the coil spring portion 4I'A shown in Figs. 4 and 5 and incorporate integral portions of the clamp into the handle formations 41.

The modification of my invention shown in Figs. 8, 9 and 10, embodies features of the two clamps shown in Figs. 4, 5, 6 and '1 in a unitary ctla'nlip constructed preferably of bent flat spring s ee In the clamp shown in Figs. 8, 9 and 10, the overlapped portions 4IC, which constitute the clamp handles 41, are connected by the curved or arcuate spring portion 4ID formed integrally therewith.

The clamping `parts of the clamp include the oppositely curved portions 4IE which are adapted to clampingly engage a circular member 40 as indicated by broken lines. The outer parallel extensions 4I F are adapted to clampingly engage flattened sides of an object 39 as indicated by broken lines, and the end portions 4IGr are bent right-angularly toward one another and preferably formed with toothed edges whereby same may frictionally engage opposed faces of a flat member such as 48 indicated by broken lines.

The opposed clamp portions 4IH formed integrally with and intermediately the handle portions 4IC and the circular clamping portions 4IE are bent into angular formations and each provided with an elongated slot 49 Vfor support therein of the electric light fixture which includes the socket 50, the nipple 5I, through vwhich the electric current conductor I1 extends, and a pair of securing nuts 52.

'Ihe electric light fixture may, as shown by dot and dash lines, be mounted on the clamp in relatively different angular positions because the nipple 5I, upon loosening of the nuts 52, may be positioned in either ends of the slots 49 which extend through the angularly bent portions 4IH.

I claim as my invention:

1. A portable electric light lamp including an electric lamp socket, a tubular member spaced from said socket, a coil spring interposed be tween and connecting said socket and said tubular member, clamping means including a pair of clamping members extending one from said socket and the other from said tubular member, and an electric current conductor extending through said tubular member and through the longitudinal axis of the convolutions of said coil spring into connections with said socket.

2. A portable electric light lamp as embodied in claim 1 and including said clamping members formed integrally with said coil spring, one of said clamping members being formed with one end of said coil springand the other of said clamping members with the Vother endofA vsaid coil spring. f f

3. A portable electric light lamp including an electric light socket-havingl anannular groove thereon, a ytubular member vspaced 'from said `socket and having an -annular groove thereon, a coil spring extending between and connecting said socket and said tubular member, said coil spring including a pair of clamping members, one of said clamping members being formed integrally with one end of said spring and the other of said clamping members being formed integrally with the other end of said spring, and an electric current conductor extending through said tubular member into connection with said socket.

4. A portable electric light lamp including an electric lamp socket having an annular groove, a tubular member disposed in spaced relation to said socket and having an annular groove, a clamp comprising a pair of spaced clamping members, a portion of one of said clamping members being secured in said groove on said socket and a portion of the other of said clamping members being secured in said groove on said tubular member, a resilient clamp portion formed integrally with said clamping members, and an electric current conductor extending through said tubular member into connection with said socket.

5. A portable electric light lamp as embodied in claim 4 and including each of said clamping members having an extended overlapped integral portion, said extended overlapped portions constituting spaced handles and being formed integrally with said resilient clamp portion.

6. A portable electric light lamp as embodied in claim 4 and including each of said clamping members having an extended portion, said extended portions constituting spaced handles, and including said resilient clamp portion comprising an arcuate bent portion formed integrally with said extended handle portions.

7. A portable electric light lamp including a pair of spaced elongated clamping members, each of said clamping members having an arcuate object-engaging medial portion and a straight object-engaging terminal portion, both of saidA