US2342470A

US2342470A - Black-out flashlight adapter

Info

Publication number: US2342470A
Application number: US448037A
Authority: US
Inventors: Leslie E Hunt
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-06-22
Filing date: 1942-06-22
Publication date: 1944-02-22
Anticipated expiration: 1961-02-22

Description

Feb. 22, 1944. -r 2,342,470

BLACKOUT FLASHLIGHT ADAPTER Filed June 22, 1942 2 Sheets-Sheet l '26 ML. A 29 6'4 I I :2/ /7 /6' I l j l 5 Z? O Q Z /f t 20 I Inventor I 28 L I ZesZz' EH10? i i y \Ear, I

5 i 5. Attorneys Feb. 22, 1944. L. E. HUNT BLACKOUT FLASHLIGHT ADAPTER Filed June 22, 1942 2 Sheets-Sheet 2 Inventor .ZesZz'eZ/fiaaf Attorney;

Patented Feb. 22, 1944 UNITED STATES PATENT OFFICE BLACK-OUT FLASHLIGHT ADAPTER Leslie E. Hunt, Bay City, Mich.

Application June 22, 1942, Serial No. 448,037

1 Claim. (01. 240-113) This invention relates to new and useful improvements in photographic flashlights and more particularly to filtering means therefor. During wartime and under blackout conditions it is prohibitive to take pictures by flash bulb light. However, it is feasible to take pictures by invisible rays such as infra-red, so it is therefore the principal object of the present invention to provide a filter which can be readily attached to a flash bulb reflector so that only infra-red rays will be filtered to the end that these rays may be used to take pictures with the use of infrared ray sensitive film.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings:

Figure 1 represents a front elevational view of the attachment.

Figure 2 is a vertical sectional view through the attachment.

Figure 3 is a fragmentary inside elevational view of the attachment.

Figure 4 is an enlarged fragmentary detailed sectional view taken substantially on the line 4-4 of Figure 1.

Figure 5 is a vertical sectional view through a modified form of the invention.

Referring to the drawings wherein like numerals designate like parts, it can be seen in broken lines that numeral 5 denotes a flash bulb mounted in a reflector 6, the enlarged front edge portion of which is rolled or beaded as at I.

Numeral 8 generally refers to the attachment which comprises an annular front wall 9 having a backwardly disposed circumferential flange I0 through which set screws H are adapted to be fed inwardly behind the head I to prevent displacement of the attachment 8 from the reflector. A packing gasket l2 may be interposed between the inner side of the wall 9 and the beaded edge portion 1 of the reflector 6 to exclude the possibility of the escape of any light rays.

The central portion of the wall 9 is formed with a round or other shaped opening l3 over which is disposable a frame l4. The frame ll has a continuous rectangular or other formed shoulder l5 at the inner side thereof within which can be disposed a filtering pane l8, held in.place by a plurality of swingable detents IT. The frame ll. of course, has an opening ll through which the invisible infra-red rays passed by the filter Hi can project.

, that numerous cha on this frame I4 is engageable with a boss 2| to hold the frame M in closed position.

Obviously, an attachment such as this can be readily applied to the conventional flash bulb reflector.

A modification of the invention is shown in Figure 5 wherein reference character 5a denotes a flash bulb and reference character 6a a reflector therefor. This modified attachment is generally referred to by numeral 23 and comprises a cylindrical shell 24 having a rib. 25 at its inner side to abut thebeaded edge of the reflector 6a. Screws 26 are feedable through threaded openings in the shell 24 to engage against the reflector 6 behind the beaded ends of the reflector.

The outer end of the shell 21 is flanged inwardly and then outwardly as at 21. Numeral 28 denotes a filtering plate which may be of some suitable plastic and this is provided with a flange 29 at its edge portion for slipped disposition over the flange 21. This may depend upon friction alone or be held in place as shown in Figure 1.

While the foregoing specification sets forth the invention in specific terms, it is to be understood es in the shape, size and materials may be r orted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

In combination with a light reflector having a beaded forward edge, a flanged rim for disposition over the beaded edge of the reflector provided with set screws for disposition behind the beaded edge, said rim having an opening, a swingable frame hingedly connected to the rim adjacent one edge of the opening, a rib on the inner face of the frame deflning a seat adapted for receiving the edges of a light flltering element, and pivoted fasteners carried by the rib and having a free end overlying the filtering element to secure the latter in the frame.

LESLIE E. HUNT.