US2153573A

US2153573A - Nonabrading reloadable cartridge

Info

Publication number: US2153573A
Application number: US102231A
Authority: US
Inventors: Donald H Kinloch
Original assignee: DuPont Film Manufacturing Corp
Current assignee: DuPont Film Manufacturing Corp
Priority date: 1936-09-23
Filing date: 1936-09-23
Publication date: 1939-04-11
Anticipated expiration: 1956-04-11

Description

April 3 D. H. KINLOCH NONABRADING HELOADABLE CARTRIDGE Filed Sept. 25, l93

INVENTOR ATTORNEY Patented Apr. 11, 1939 UNITED STATES PATENT OFFICE 2,153,513 NONABRADING RELOADABLE CARTRIDGE Application September 23, 1936, Serial No. 102,231

Claims.

This invention relates to a non-abrading reloadable cartridge for photographic film. A principal object is to provide a reloadable cartridge that cannot scratch or streak the film during unwinding, retraction and reloading even under careless or unskilled use. Another object. of this invention is to provide a simple and inexpensive cartridge that can be readily reloaded and adjusted in a dark room by the amateur.

Further objects will more plainly appear from the detailed specification and description hereinafter setvforth.

The present invention is primarily directed to cartridges for use in miniature or so-called Candid cameras that employ perforated cine-film having a sensitized surfacethat is often hypersensitized in a dark room by the user just before loading in the camera. This film presents an extremely delicate surface readily marredby prior cartridges even when under unusual care. Fur-.

-thermore prior cartridges provide no means for preventing unavoidable oraccidental pressure on the delicate surfaces of the film by the lips of the film-slot during extraction or retraction of u the film. In prior devices this causes much serious damage to the film and is a source of frequent grief to the user and manufacturer. These and other disadvantages in the prior art have been efiiciently overcome by the present invention which provides means for preventing the harmiul effects of pressure on the delicate film surfaces by positively separating the film guide lips in light-excluding spaced relationship.

The accompanying drawing shows diagrammatically in Figure 1: a perspective view of the assembled cartridge; t

Figure 2: an exploded view in perspective of the cartridge showing the caps, spool, separators m and casing;

Figure 3: a longitudinal cross section taken on the vertical axis of the cartridge;

Figure 4: a longitudinal section of a detail taken on the line 44 in Figure 1 showing the separators; Figure 5: a modified detail of the guide separators in Figure 4.

The cartridge comprises a cylindrical tubular casing III open at both ends and having a straight 5o longitudinal outwardly projecting slotted film guide provided with lips I8 extending the length of the casing. The guide I! is lined on the inside of both lips l8 with light-excluding material H such as velvet or felt ribbon. The remainder of the cartridge i0 is unlined. Over the top of the casing '10 is slidably fitted a rigid cylindrical cup shaped cap ll having a guide 32 adapted to fit over the lips I! of the casing Ill. The guide 22 is provided with an inwardly projecting separator l8 adapted to fit in between the lips 18 and (Cl. 242-'l1) to hold them apart in spaced relationship between the cap guides 32. The cap II is provided with an annular outwardly projecting collar 20 which forms a guide bearing seal for the exterior of the spool shank and an inwardly projecting annular groove 2| which cooperates with a ridge upon the flange of the film spool to form a lightlock. Cap l2 which fits on the bottom of the easing has a similar guide portion 32 or 32' (Fig. 5) which engages the lips of the casing. This cap is further provided with an inwardly projecting collar 22 which engages the inner periphery of the shank and forms a bearing seal therefore. The cap I2 is further provided with an annular groove 23 which cooperates with a ridge on the lower flange of the film spool to form a light lock.

The spool comprises the usual hollow shank,

member and the usual film slit as shown in Figure 3. The lower portion of the shank is provided with the usual spool key 24, countersunk with respect to the lower spool fiange 25 and adapted to engage the rewind key in the camera, not shown. The upper portion of the shank is provided with a knurled thumb screw 28 that projects upwardly from the upper flange 26. The spool I3 is providedwith film retainingend

fianges

25 and 26 having outwardly projectingridges 21.

The spool I3 is adapted to slidably fit into the casing l0 and the caps H and 12 so that the ridges 21 may rotate in slidable light-excluding contact with the end caps, II and 12, forming an efiicient light seal therewith.

To assemble the cartridge the reeled spool 12 is placed in'the casing Ill and the film I4 is drawn through the plush-lined guide lips 18. The top cap II is slipped over the top end of the casing in, permitting the thumb screw 28 to project through the opening 30, the collar 20 fitting around the thumb screw 28 and the ridges 21 fitting against the inwardly projecting grooves 2| to form a light seal therewith. The bottom cap I: is slipped over the lower end of the casing 10 so that the inwardly projecting collar 22 engages the inner periphery of the lower end of the shank of the spool 13 so that the ridge 2| fits against the inwardly projecting grooves 2| and 22 to form a light seal therewith. The caps Ii and I! are then fixed on the casing with readily removable and resealable adhesive tape 3|.

When the cartridge is thus assembled the guide lips 18 are securely held in position by the guide lips l5 and the lip separators It as shownin Figure 4 (or 29 as shown in Figure 5) both at the top and bottom of the cartridge. The separators it as shown in Figure 4 (or 29 as shown in Figure 5) furthermore hold the lips l8 securely apart, thus preventing them from exerting any harmful pressure on the delicate surfaces of the film it, the light-excluding material IT having When the cartridge is in the camera the camera rewind key is engaged with the spool key 24 and the thumb screw 28 is used to advance or retract and adjust the film and draw it taut against the sprocket in the camera. After exposure the cartridge may be taken to the dark room and the detachable seal 3| removed, the cap H slipped off and the reeled spool ll slipped out of the casing ID by gripping the thumb screw 28. The film I4 may then be developed.

The cartridge may be readily reloaded in a dark room with fresh or hypersensitized film in the following manner: a suitable length of film i4 is engaged with the spool shank slits and reeled on the spool l3, no paper leader being needed. The reeled spool I3 is slipped into the cylindrical case I so that the free end of the film l4 will slide through the guide lips l8 held apart by the separators l6 (or 29). The cap H is slipped over the top end of the casing Ill and the cartridge may then be removed to white light, where replaceable sealing tape 3| may be applied to hold cap I I in place. In working in the dark room the thumb screw 28 afiords readily accessible means for removing and inserting the spool l3 in the cartridge.

A wide choice of materials is available for the construction of my novel cartridge. Any inexpensive non-fogging sheet metal of sufiicient rigidity to prevent accidental distortion of'the casing 10 may be used as no cumbersome retaining'clamps are necessary with my improved cartridge which also avoids the use of complicated looking or fastening devices suggested in the prior art for retaining the cartridge in its assembled position. Preferred materials are rigid lacquered brass sheeting, dye cast aluminum, rigid cellulose derivative compositions, and rigid plastics such as phenol condensation products of the type known as Bakelite, or the like. The lining of the guide lips l8 are preferably velvet ribbon, having sufiiciently high pile to adequately light-seal the opening. However, any other suitable non-fogging, light-excluding, easily compressible fabric, such as plush or felt may be used.

The hereindescribed combined light sealing action of the ridges 21 with the grooves 2| and 23 make it unnecessary to provide a lining for the casing III or felt discs for the caps II and I2.

A preferred cartridge structure inexpensive enough to be given away with the purchase of the film may be made according to my invention from lacquered brass sheeting for the caps II and II, the casing Ill and spool l3, and velvet ribbon for the lining of the guide lips l8.

While applicant has herein described his novel reloadable, non-abrading cartridge in detail, he does not contemplate limitation thereto, but does include all forms and modifications within the language and scope of the appended claims.

I claim l. A non-abrading reloadable light-proof film cartridge comprising an -unlined tubular casing provided witha straight longitudinal outwardly projecting slotted film guide having lips lined with light-excluding material; a removable and resealable cup shaped cap sealed over each end of said casing; said caps having portions fitting over said guide, said portions having inwardly projecting members approximately the width of said slotted guide for holding said lips apart; and a roll of projecting substantially hemispherical indentations adapted to hold said lips apart; and a roll of sensitized film carried by a spool provided with end fianges adapted to slidably fit and rotate in light excluding contact in said cartridge.

3. A film cartridgecomprlsing a tubular casing provided with a straight longitudinal slotted film guide having outwardly projecting lips lined with light-excluding material, a removable cup shaped cap on each end of the casing having a portion fitting over the lips of the film guide, an inwardly projecting member extending between the lips of the film guide for holding said lips apart and an annular groove; and a'film spool provided with end flanges having an annular ridge which is adapted to contact with the respective caps and form a light-lock with the respective annular grooves.

4. A film cartridge comprising a tubular casing provided with a straight longitudinal slotted film guide having outwardly extending lips lined with light-excluding material, a removable cup shaped cap on each end of the casing having a portion fitting over the lips of the film guide and an annular groove, the upper cap being further provided with an outwardly extending annular collar which forms a bearing seal for the exterior periphery of the film spbol shank, the lower cap being further provided with an inwardly extending annular collar which forms a bearing seal for the inner periphery of the film spool shank; and a film spool having a hollow shank which is adapted to extend through the upper cap and an upper and lower. flange having annular ridges which are adapted to contact with the respective caps and form a light-lock with the respective annular groove s.

5. A film cartridge comprising a tubular casing provided with a straight longitudinal slotted film guide having outwardly projecting lips lined with light-excluding material, a removable cup shaped cap on each end of the casing having a portion fitting over the lips of the film guide, an inwardly projecting member extending between the lips of the film guide for holding said lips apart, and an annular groove, the upper cap being further provided with I an outwardly extending annular collar which forms a bearing seal for the exterior periphery of the film spool shank, the lower cap being further provided with an inwardly extending annular collar which forms a bearing seal for the inner periphery of the film spool shank and a film spool having a hollow shank which is adapted to extend through the upper cap and an upper and lower flange having annular ridges which are adapted to contact with the respective caps and form a light-lock with the respective annular grooves.

DONALD H. KINLOCH.