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Publication numberUS2276735 A
Publication typeGrant
Publication dateMar 17, 1942
Filing dateOct 4, 1941
Priority dateOct 4, 1941
Publication numberUS 2276735 A, US 2276735A, US-A-2276735, US2276735 A, US2276735A
InventorsDuffield Miller Fred
Original AssigneeDuffield Miller Fred
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lantern slide clamp
US 2276735 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

-March 17, 1942. F. D'. MILLER LANTERN SLIDE CLAMP 2 Sheets-Sheet 1 Filed Oct. 4, 1941 2 717517 l MILL-E llforuey March 17, 1942. MILLER 2,276,735

. LANTERN SLIDE CLAMP Filed Oct. 4, 1941 2 Sheets-Sheet 2 I m'en for m 2 7%]; D.M/LLE/? A III/rue Patented Mar. 17, 1942 LANTERN SLIDE CLAMP Fred Duffield Miller, Altoona, Pa.

Application October 4, 1941, Serial No. 413,671 2 Claims. (01. 88-26) The present invention relates to new and useful improvements in slide clamps for projecting lanterns and has for its primary object to pro-- vide, in a manner as hereinafter set forth, novel means for holding a plurality or series of slides for facilitating the showing thereof.

Another very important object of the invention is to provide a lantern slide clamp of the aforementioned character comprising unique means for centering or framing the slide being projected.

Other objects of the invention are to provide a lantern slide clamp of the character described- Which will be comparatively simple in construction, strong, durable, highly efiicient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specificaticn, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure l is a perspective view, showing an embodiment of the present invention in use.

Figure 2 is a view in front elevation of the device.

Figure 3 is an end elevational view.

Figure 4 is a vertical sectional view through the holder, taken substantially on the line 4 --4 of Figure 3.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises substantially channel-shaped, opposed upper and lower bars I and 2, respectively, of resilient metal or other suitable material. The channel bars I and 2 are adapted to receive therebetween a series of lantern slides 3. The flanges 4 of the bars I and 2 are inwardly bowed in a manner to frictionally grip the sides of the lantern slides 33. The web of the upper bar I has formed transversely therein at longitudinally spaced points grooves or channels 5 the purpose of which will be presently set forth.

Mounted on a conventional projecting lantern 6 is a holder which is designated generally by the reference numeral I. The holder 1 comprises a plate 8 having an aperture 9 therein. Onthe upper and lower edges of the plate 8 are integral guide flanges III of angular cross section which are adapted to slidably receive the bars I and 2' with the slides 3 therein.

The upper guide ID has pressed downwardly therein a transversely extending rib or detent II which is engageable in the grooves or depressions 5 in the upper bar I,

Mounted on the lower guide I!) is a bowed spring I2 on which the bar 2 rides and which is maintained under tension thereby. The spring I2 terminates in downturned end portions I3 which are engaged with the ends of the lower guide II] for securing said spring against longitudinal movement in the holder '1.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, the spring I2 yieldingly urges the bar I upwardly against the upper guide I0. The detent II is located above the vertical center of the light aperture 9 in the plate 8. A groove or channel 5 is provided in the bar I for each of the lantern slides '3 above the vertical center thereof. As the bars I and 2 are moved through the holder I the slides 3 are brought into registry with the light aperture 9. When the correct position is reached the detent II is engaged in the adjacent groove or channel 5 for releasably holding and centering the slide being shown. Of course, to shift the slides it is only necessary to exert sufficient force to overcome the tension of the spring I2. The clamping bars I and 2 may be used to support a series of slides in any suitable mount other than the holder 1, as, for example, when it is desired to view said slides without projecting them on a screen.

It is believed that the many advantages of a lantern slide clamp constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understod that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. A lantern slide clamp comprising a holde including a plate having a light aperture therein,

angular guide flanges on the upper and lower ends of said plate, a pair of opposed channel bars, for the reception of a series of slides, operable in the holder and slidable on said guides, resilient means on one of the guides for yieldingly urging one of the bars against the other guide, and coacting means on said one bar and on said other guide for releasably securing the slides in adjusted position in the holder, the lastnamed means including a transverse detent on said other guide, said one bar having a series of transverse grooves therein at longitudinally spaced points for the reception of said detent.

2. A lantern slide clamp of the character described comprising a plate having a light aperture therein, guides of angular cross section said channel bars being inwardly bowed for en- 10 gaging and frictionally gripping the sides of the slides, one of the bars having a plurality of transversely extending grooves at longitudinally spaced points in its web portion, a detent on one of the guides engageable in the grooves for re leasably securing the slides in adjusted .position in the holder, and a bowed spring mounted on the other guide and engaged with the other bar for yieldingly urging said one bar against said one guide, said spring including downturned end portions engaged with said other guide for retaining said spring against longitudinal movement thereon.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2452745 *Apr 3, 1946Nov 2, 1948Getter HermanStill picture attachment for moving picture projectors
US2457914 *May 22, 1944Jan 4, 1949Otto R NemethConvertible film gate construction
US2477107 *Aug 31, 1946Jul 26, 1949Bausch & LombSlide projector
US2515602 *Jul 13, 1946Jul 18, 1950Jablon Theodore MAdapter for slides in a still projector
US2534561 *Jun 15, 1946Dec 19, 1950John SilverDevice for displaying photographic transparencies
US2583510 *Jun 14, 1948Jan 22, 1952Ingram Frederick BPicture viewing device
US2595978 *Apr 12, 1950May 6, 1952Viewlex IncFilmstrip transporting mechanism
US2597449 *Nov 9, 1950May 20, 1952Universal Camera CorpSlide projector with rotatable slide mount
US2674920 *Jul 17, 1952Apr 13, 1954Three Dimension CompanyStereoscopic viewer
US2853045 *Feb 12, 1957Sep 23, 1958Thomas Laurence CIndicator for serving tray
US2892274 *May 29, 1953Jun 30, 1959Afton Leonard NHand slide viewer
US2971434 *Jan 23, 1957Feb 14, 1961Sylvania Electric ProdProjection slide holder
US3164058 *Dec 1, 1960Jan 5, 1965Columbia Broadcasting Syst IncFilm projector and optical system therefor
US3466126 *Apr 22, 1966Sep 9, 1969Sakamoto YoshichikaSlide-holding frame and a file plate for filing such frames
US3712726 *Mar 30, 1971Jan 23, 1973Reibel RPhotographic viewer
US4682430 *Mar 27, 1986Jul 28, 1987Plasti-Line, Inc.Price chip support strip
U.S. Classification40/701, D16/233
International ClassificationG03B23/00, G03B23/14
Cooperative ClassificationG03B23/14
European ClassificationG03B23/14