US2034913A - Electric hand lamp - Google Patents

Description

March 24, 1936. Q 2,034,913

ELECTRIC HAND LAMP Filed March 31, 1954 Patented Mar. 24, 1936 ELECTRIC HAND LAMP Josef Kriis, Frankfcrt-on-the-Main, Germany Application March 31, 1934, Serial No. 718,507 In Germany July 16, 1932 8 Claims.

My invention relates to an electric hand lamp which can be attached to any article by means of a spring clamp. The part which carries the lamp bulb is rotatably mounted on the spring 5 clamp, whereby the rays of the lamp can be directed towards any point independently of the position of the clamp. The spring clamp is so formed that it acts by pressure and friction on the article on which it is clamped in order to effeet a secure hold on articles of any shape. The bulb socket is in one piece with the ring which surrounds the spring clamp and may be of insulating material, and spring rods are provided which partially form the pivot of the clamp and partially lie at right angles thereto and constitute the braking fixation of the ring, whereby the bulb is automatically secure in every position relative to the clamp. A self-locking device may also be provided for the bulb provided with a reflector.

The utility of the hand lamp extends to all places having an electric supply, such as works, mills, industrial establishments and so forth.

In the accompanying drawing which illustrates a constructional example,

Figure 1 is a side elevation,

Figure 2 is a rear elevation.

Figures 3 and 3a are detached front and fragmentary side elevations respectively of parts of the clamp.

Fig. 4 is a view in section taken on line AB of Figure 1.

Figure 5 is a view in section taken on line C-D of Figure 4 and Figure 6 is a view in section taken on line EF of Figure 4.

In the drawing, the lamp casing a has a tubular lug b and is mounted on the socket c which is of insulating material and has a ring 01 provided with tooth shaped indentations. A resilient,

4,0 semiannular ring 6 is connected by a pin f to the neck of the socket c and engages with nose-like projections g in the tooth-like indentations of the ring 11, whereby the rotatable lamp casing is locked in every position. The bulb h is mounted 45 in a corresponding screw thread in the socket c and receives current through the contact pins 1' and k in the usual manner.

The current is supplied through a cable I which engages by means of a bend m with a recess n 50 in the socket c, the recess communicating with two passages o and p which lead the electric wires to the contact pins 2 and k. The arrangement of the cable in the above described manner secures the connections against breakage by a pull on 55 the cable.

The socket c has a ring-shaped extension q the inner part of which is turnably engaged by crosswise arranged rods 1' and s which are mountclamping position by means of a spring r. The jaws each carry at the clamping point a pair of semi-cylindrical presses y of rubber, which are tiltably mounted by the aid of Wires 2 in the jaws 10 v and 10 respectively. The tiltable mounting of the presses permits them to accommodate themselves to the shape of the article to which the lamp is clamped, and owing to the twin semi-cylindrical form of the presses an attachment to 15 the said article takes place by pressure and friction. Owing to the tiltability at the clamping point each pull strengthens the grip on the said article. The presses are preferably formed of rubber having cotton or other fibrous material 2 extending through it. The tilting effect and strengthening of the attachment is improved if each semi-cylindrical part y has a separate turning place a or e. The clamp jaw v engages the rod s by means of a circular hole and only the 25 jaw w is rendered movable relative thereto by means of a slot z" whereby the application of the hand lamp to a supporting article is facilitated.

The whole bulb socket can be turned 360 de 30 grees round the clamp and remains fixed in every position, and the lamp casing a can also be turned 360 degrees and also remains fixed in every position.

I claim: 35

1. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on means forming a pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp.

2. In a portable electriclamp, the combination with a lamp socket provided with an annular ex tension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a 2 pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp, and means fixedly secured to said pivot axis and slidably engaging the annular extension of said lamp socket for preventing tilting movement of the latter about the pivot axis of said clamping jaws.

3. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis cf which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a common pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp, said pivot axis comprising a tube, rods slidably arranged in the ends of said tube and projecting therefrom and means for urging the rods outwardly in engagement with the inner side of said annular exten- 4. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a common pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp, and a lamp casing adjustably secured to the lamp socket and adapted to be rotatably adjusted about the axis of the same.

5. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on means forming a pivot axis which is positioned diametrically in the opennig of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp, and a lamp casing adjustably secured to the lamp socket and adapted to be rotatably adjusted about the axis of the same, said lamp casing having a light emitting opening arranged in a plane parallel to the axis of said socket.

6. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a common pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the longitudinal axis of said clamp, and means secured to said axis and engaging the annular extension of said lamp socket for preventing tilting movement of the latter about the pivot axis of said clamping jaws, said means comprising tubular members fixedly secured at a right angle to said pivot axis, rod-like members slidably arranged in the outer ends of said tubular members and projecting therefrom and means for urging said rod-like members outwardly in engagement with the inner side of the annular extension of said socket.

7. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a common pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the 1ongitudinal axis of said clamp, and a spring about said pivot axis and engaging one end of each jaw for urging the other ends of the jaws into closed position, and a pair of rubber presses mounted pivotally in double bearing on each clamping end of the jaws, said presses being provided with substantially semi-cylindrical pressure faces.

8. In a portable electric lamp, the combination with a lamp socket provided with an annular extension the center axis of which extends at a right angle to the longitudinal axis of said socket, of a clamp extending through the opening of said annular extension, said clamp comprising two jaws pivotally mounted between their ends on a common pivot axis which is positioned diametrically in the opening of said annular extension and slidably abuts with both of its ends the inner side thereof, whereby said lamp socket may be adjusted to any position in a circle about the 1ongitudinal axis of said clamp, and means including spring pressed rod members secured to said axis and engaging the annular extension of said lamp socket for preventing tilting movement of the latter about the pivot axis of said clamping jaws, one of said clamping jaws being provided with a circular hole through which one of said rod members passes to prevent its movement, the other jaw being provided with a slot through which the other rod member passes to prevent its movement.

JOSEF loads.

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