US1848812A

US1848812A - wiley

Info

Publication number: US1848812A
Authority: US
Publication date: 1932-03-08
Anticipated expiration: 1949-03-08

Description

March 8, 1932. MWILEY 1,848,812

REFLECTOR AS SEMBLY Filed Jun 16, 1930 Patented Mar. 8, 1932 LEE 1:. WILEY, or MARION,

INDIANA, Assrcuoaro nnmaimno'rmc COMPANY, or

MARION, INDIANA, A CORIOBATION OF. INDIANA I Application filed June 16,

This invention relates to the reflector and lamp assembly of electric lanterns or flashlights and has for its primary objects to provide means for locking the lamp in focus and to reduce manufacturing costs.

which Other and further objects and advantages will become apparent as the disclosure proceeds and the description is read in conjunction with the accompanying drawings in 1 is a perspective view of the base of a re ector provided with a single lead lamp socket thread;

Fig. 2 is a perspective view of the lock nut employed to hold the lamp in proper adjustment;

Fig. 3 is a vertical sectional view through the reflector assembly showing a lamp and lock nut in place; and

Fig. 4 is a rear view of the same.

Reflectors of the type now in use are usually equipped with a tubular socket which extends rearwardly from the base of the reflector and is threaded to receive the screw base of the lamp. When the lamp is screwed firmly in place, it is supposed to be in focus, but such is seldom the case because of inaccuracies in the manufacturing processes and the wear on the parts.

Another difficulty with the old type of reflector assembly is that the lamp often becomes loose within its socket causing the focus to be destroyed and many times resulting in a failure of the base of the lamp to make contact with the battery cell terminal.

Referring now to the drawings, the reflector 10 is of the usual semi-spherical or parabolic form, the base being slightly raised at 11 and apertured at 12 leaving an annular marginal flange 13. The inner surface 14 of the reflector is nickel or chrome plated as usual.

A single punching operation is all that is necessary to extrude a helical lip 15 from the flange 13 which begins at a point 16 and extends approximately half way around the flange where a radial slit 17 is necessarily formed.

The pitch of the helical lip is approximately twice that of the screw base so that th dista-nc'e between the edge is cf-the' flag;

and the point 19 of the would be substantiallythe' pitch of the thread 'on'i-thelamp baser Since the lamp is intended to fit rather loosely within the re flector fsocket' the approx= imations inthe forming of thieiiigle lead thread in the reflector do-n ot' racy of the focus obtainable, nut, hereinafter to be described,firmly' holds the lamp' in its proper'positioni A preferred lock nut 2O 'i'sTshown in Fig} 2"and' is forme'diby extruding a helical'lip 2l'from a relatively thin washer'22, the prob" ess bein exactly the same as that described withiref' e'rence to the reflector. The slit23 formed in making the helical lip is somewhat less in length than the width of the annular member so that the outer wall of the nut remains intact. To facilitate turning, the outer edge of the nutis scalloped, as shown at 24.

The reflector assembly is shown clearly in Fig.- 3 where the cooperation between the rounded threads 25 of the screw base, the lamp 26, the reflector socket consisting of the single lead thread, and most apparent.

As will be noticed, the crowding of the annular flange 13 of the reflector and the inner wall of the lock nut into the hollow of the the lock nut is made lamp threads accomplishes a most satisfactory locking of the lamp within the reflector.

The single lead threads in the reflector and the lock nut may, of course, be formed in other ways than the one described, as for example by having the lip extend clear around the aperture, and it will be understood that m any other details may be varied without departing from the spirit of this invention, the scope of which is indicated in the appended claims.

I claim as my invention:

1. A flashlight reflector provided with an aperture, and a locking nut adapted to be having a single conen a d with the base behind. the reflector to loo t e base and refiectortightlyto ether.

2. A flashlight reflector rovide with an r aperture, the material of t e reflector about 5 the aperture forming an inwardly directed flange broken at one point and formed to provide a screwthread having a single convolution, and a locking disk having an opening, the material of the disk about the open- 10 ing beingbroken at one point and formed to provide a screwthread similar to that of the reflector, in combination with a lamp havin a screwthreaded baseadapted to be engafid and lockedvn'th the reflector and looking I:

5 threads} 3. A flashlight reflector provided with an aperture, the material of the reflector about the aperture forming an inwardly directed flange broken at one point,v a portion of the 20 flange being struck out in one direction from the plane of the rema nder of the flange to provide a screwthread having a sin Ie con volution, a lamp having a sorewthrea ed base adapted to be engaged with the reflector aper- 3 ture, and a locking nut adapted to be engaged with the base behind thereflectorto lock the base and reflectortightiy to ether. J In testimony whereof I aiiix my signature.

:6 LEE M. WILEY..