US1395490A - Lamp - Google Patents

Description

w. W.'GRAFF'.

LAMP.

APPLICATION FILED JAN- 14, 1918.

1,395,490. Patented No'vi 1,1921" V v Wmigenibfi UNITED STATES PATENT OFFICE.

WALTER W. GRAIF, OF EAST CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO JOHN O. SCHMITT, OF CLEVELAND OHIO.

LAMP.

Specification of Letters Patent.

Patented Nov. 1. 1921.

Application filed January 14, 1918. Serial No. 211,756.

To all whom it may concern:

Be it known that I, WALTER V. GRAFF, a citizen of the United States, residing at East Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Lamps, of which the following is a full, clear, and exact description.

This invention relates to lamps for motor vehicles and has particular reference to what is generally known as a spot-light, the 0bject of the invention being to provide certain features of construction in a lamp of this character by which the lamp and its reflector can be moved forwardly or rearwardly'with respect to the lens, or can be taken as a unit entirely out of the casing.

\Vith a lamp embodying my invention, the source of light, that is to say, the lamp proper and its reflector can be slid back and forth so as to throw distant more or less concentrated beams, or give a diffused light which spreads considerably, and when the lamp proper and its reflector are slid out of the casing it can be very conveniently used as a trouble lamp.

In one embodiment of my invention I employ a casing, which by preference is cylindrical, and I mount the source of light, 2'. e., the lamp proper and its reflector on a plunger which can be moved inwardly or out- 'wardly through the rear end of the casing,

and I further arrange the rear end of the casing so that said end can be disconnected from the casing to allow the lamp proper and its reflector to be slid entirely from the casing.

The invention may be further briefly summarized as consisting in certain novel details of construction and combinations and arrangements of parts which will be described in the specification and set forth in the appended claim.

In the accompanying sheet of drawings illustrating my invention, Figure 1 is a side view of my improved lamp with the attaching bracket, parts being'broken away; Fig. 2 is a front View of the same; and Fig. 3 shows the lamp proper and the reflector removed from the casing so that the device can be used as a trouble lamp.

The lamp includes a casing 10 which is preferably cylindrical in shape, and is of sufiicient length to enable the lamp proper, to be referred to presently, to be shifted back and forth, from or toward the lens to obtain the desired concentration of beams, or diffusion of light. The casing has attached to it a suitable bracket or clamp 11 by which the lamp may be attached to a suitable support, which will generally be some part of the windshield construction, when the lamp is used as a so-called spot light. In this instance, the clamp 11 is connected to the casing through the medium of a ball 12 which the clamp engages with a universal action which enables the lamp to be turned so as to direct the light in any desired direction. In this instance the clamp is composed of suitably shaped plates 11 and 11 through which pass short bolts 11 by which the plates of the clamp are caused to tightly grip the ball 12, and also the support to which the lamp is designed to be attached.

At the front of the casing there is a fixed lens 13, andat the rear of the casing there is a cap-like end 14 which has a central opening and is removably attached to the casing. If desired, this end or cap can be normally fastened in place by the ordinary bayonet joint, although any other device for removably attaching the cap may be employcd.

The incandescent lamp or lamp roper 15, and a curved reflector 16 are carried at the forward end of a plunger 17 which extends centrally and axially into the casing, this plunger passing through the central opening of the end cap 1 1. The plunger, which is adapted to be slid back and forth, has a bearing in the end cap, this construction providing a fairly free sliding connection between the plunger and the casing, and at the same time the lamp is positioned centrally or on a longitudinal axis of the casing. lVit-h this arrangement, by moving the plunger in or out, the lamp 15 can be positioned close to the lens or at a distance therefrom, and in this way the distance that the beams of light are thrown can be varied as desired, and at the same time whether the beams are concentrated or diffused can be controlled. The end cap 14 has a set screw 14 by which the plunger can be fastened in any position of adjustment.

The current supplying conductors 18 for the lamp 15, extend into the rear end of the plunger 17 and through the plunger to the lamp. At the rear end of the plunger I prefer to provide a switch which is shown conventionally at 19, and by which the current can be turned on and off. This switch may be of any suitable construction, but

preferably involving a rotary part whichalong the plunger to its forward end so as to act as an extension reflector and as a protector for the lamp 15 and reflector 16, this being clearly illustrated in Fig. 3.

While I have shown only the preferred form of my invention, it will be obvious that the construction'imay ibevai'id inrdetails, and I aim inmy claimto-coverall modifications which do not involveaideparture from the spirit a-ndscopeofmy'invem.

tion in its broadest aspects.

Having described a my invention whatfi'l claim is:

In a lamp a'xca sing havi'n'g'aialllensaatiits front end, and at. its rearvendshavingaacup-i:

shaped or concave closure,:-a plunger Tfreely slidable through said closure,:;and;provided at its forward end with a lamp and reflector, said lamp, reflector, plunger-andrrear-end closure being removable as a'unitifrom the casing, and when so: removed, theclosure be ing movable along the; lunger so as'. to Barround the lamp and re ector and: serve as-a hood therefor.

In testimony whereofil hereuntonafiiiriny signature, p

WALTER W.:'.GRAIF'.'

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