US2733872A - Wurzel - Google Patents

Description

H. WURZEL 2,733,872

DRIVING MEANS FOR ROLLS, SPOOLS, AND THE LIKE Feb. 7, 1956 2 Sheets-Sheet 1 Filed Jan. 6, 1954 FIG. 2

FIG.

.IIIIIIIIIIAI fi l I I FIG. 4

FIG. 3

INVENTOR HUGO WURZEL ATTORNEY Feb. 7, 1956 H. WURZEL 2,733,872

DRIVING MEANS FOR ROLLS, SPOOLS, AND THE LIKE Filed Jan. 6, 1954 2 Sheets-Sheet 2 FIG. 5

FIG. 6

INVENTOR HUGO WURZEL ATTORNEY United States Patent Long Island City, N. Y., a corporation of New x Application January 6, 1954, Serial No. 402,519 1 Claims. (Cl. 242-11 This invention relates to improvements in driving means forrolls, spools and the like, and more particularly to a driving means of the type adapted to be interposed between the'film -wind knob and the film-rewind roll of a loaded camerafor driving the roll so as the wind up the film following each exposure thereof.

A general object of the invention is the provision of a drivingmeans of the stated type characterized by simple andinexpensive construction and which at the same time is positive in its action and thoroughly dependable in operation. I

Another object of the invention is the provision of a driving means as aforesaid, which may itself be simply assembled and, disassembled, as well as one permitting easy and quick coupling and uncoupling of the film roll therewith. i I 3A more particular object of the invention is the provision of a driving means for a camera film roll of the type employing a key shaft turnable by a film wind knob mountedexternally of the camera case and a driving key carried by the key shaft and adapted to be cooperated with the film roll, wherein the driving key is in the form of a web, ,as distinguished from a pin, and is detachably yet effectively secured within ,aslot provided in the key shaft by a spring retaining ring seated in a groove thereforealso provided in the key shaft.

' A further object of the invention is the provision of a film roll 'driving. means as last above characterized, wherein the spring retaining ring is operative to secure the web. key against both axial and radial separation from the key shaft.

Thelabove and other. objects and advantages of a film roll: driving means according to the invention will appear fromthe following detailed description thereof, in which reference is made to the accompanying drawings, illustrating apreferred physical embodiment thereof, wherein Fig. l is a view, partly in section, looking into the film roll space of an opened camera case, which illustrates a driving means for driving. the film roll contained in said space through a film wind knob mounted externally ofithe camera case;

FEigfZis aview similarto Fig. 1,, but with the film wind knob and associated parts turned throughout an angle of 90;

Fig. 3 is a side elevation of the key shaft constituting one component of the driving means of the invention, with key omitted;

Fig. 4 is a front elevation thereof;

Fig. 5 is a side elevation of a web-form of driving key according to the invention;

Fig. 6 is a front edge view thereof;

Fig. 7 is a view looking into the head or driving end of the key shaft with key assembled thereon and secured by a spring retaining ring; and

Fig. 8 is a view similar to Fig. 1 but with all parts shown in side elevation.

Referring to the drawings, reference numeral 10 designates the frame or body of a camera case, and more par- 2,733,872 Patented Feb. 7, 1956 "ice 2 ticularly the frame portionwhich defines and end of the film-roll space into which a film rewind roll 11 is inserted. As is usual, the roll 11 is adapted to be driven manually by a knob 12 mounted externally of the camera case and whose under face bears on a wear collar 13 aflixed to the outer face of said case.

According to the invention, the knob is aflixed by suitable means (not shown) to the outer end of a key shaft 15 of length to extend from the knob through the frame 10 and to project a short distance into the film roll space. As best seen in Fig. 3, the key shaft has a large diameter portion 16, a neck portion 17 of lesser diameter resulting in the formation of a shoulder 18, and a smaller.

diameter driving end or head portion 19 spaced axially from the neck portion by a groove 20. By reference to Fig. 2, the larger portion 16 of the key shaft extends into a closely fitting opening 22 provided thereforin the frame 10, the cylindrical wall surface of said opening thus providing a bearing for the key shaft. The shoulder 18 is so located axially in said opening thatit serves as an abutment for an internal flange 23 formed on said frame to extend about the shaft opening at its inner end, the smaller diameter opening defined by said flange accommodating the neck portion 17 of the key shaft. Thus, the frame flange 23 and shaft shoulder 18 cooperate to locate the key shaft in one axial direction, i. e, by preventing inward movement of the key shaft beyond an axial position in which its shoulder engages said frame flange.

According to a further feature of the invention, the key shaft 15 is provided with a diametrical slot 24 cut through the head and neck portions and extending well into the large diameter portion thereof, and also intersecting the shaft groove 20. Such slot provides for the reception of a web key 25 which, as shown in Figs. 5 and 6, is flat and generally rectangular in shape, whereby it may be stamped from sheet metal and hardened. As best seen in Fig. 5, the key has adriving or head end 25a of appreciably greater width than the diameter .of the head portion 19 of the key shaft and a seating end 25b of lesser width and which is adapted to extend into the portion of the slot 24 cutting through the large diameter portion 16 of the key shaft. In its wider end, the key is provided with opposite edge slots 26a, 26b which are spaced outwardly from its front end edge a distance corresponding to the distance that the key shaft groove 20 is spaced from the end face of the key shaft. Moreover, the slots 26a, 26b have width corresponding to the width of the key shaft groove 20, and their depth is such that the width of the key between the bottom of the slots corresponds to the diameter of the circle of the bottom of said shaft groove, although such width dimension may be slightly greater than said diameter. It will also be observed that the wider and narrower ends of the web key 25 are defined one from the other by opposite shoulders 27a, 2711 which are spaced a slight distance from the slots 26a, 26b and are preferably rounded as shown. As seen in Fig. l, the shoulders 27a, 27b, following final assembly of the key 25 in the key shaft groove 24, are adapted to abut loosely on the inner wall of the frame flange 23, thus to locate the key shaft in the other axial direction, i. e. prevent its outward movement.

A web key as described is adapted to be secured against axial and radial separation from the key shaft 15 by means of a spring retaining ring 28, preferably a so-called E ring as disclosed in United States Patent No. 2,411,761, dated November 26, 1946. Such a ring is of the open type, that is to say, a large gap is provided between its open ends whereby the ring may be assembled in its groove by simple radial deformation, and it is provided with middle and end lugs or protrusions 28a, 28b, 28c,

off the ring body, the-lugs terminating in inner arcuate edges which lie on a circle of somewhat smaller diameter than that of the circle ofthe bottom ofthe groove in which the ring seats, whereby, when assembled in its groove, the ring secures itself. with spring pressure.

Thus, accrding-;to-.the invention,- a web key. such. as the key,25 may be locatedfandsecured to thekey shaft 1'5fsi1'nplyby inserting the narrow end 25b of the key shaft into the shaft slot .24 to a depth such that the key slots 26d, 26b line up with theshaft grooveliiand thereupon. .assemblingfthe retainingring- 225 in said groove in the: usual "manner... Dining suchassembly, at least the ring ,end.1ugs,.-28b, .z cmove into thekey slots 26a, Zeb and tlfiereby securely lock the key in operating position tosth'e.keylshaft.- WhenLit-isdesired to remove the key fr'on'uthe keysh'aft for repair-or replacement purposes, suchmay befited simply by disassembling the retaining ring 28! from the shaft. groove 20 in the usual manner, whereuppnthe key may. besimply withdrawn from the key,slot 24..- Itis' a further feature of the invention that upon.:removahbfihblkey from the'keyshaft the entire keyshaftassemblymay be difassernbled from the camera simplyjbypull exerted on theknobll l Diie to the-.Widthlof the .widehendZsa of the Web key being,..greater.tlian the diameter of the head end 19- of the key. shaft,..the side. edges of the key extend radially from the-latter, as-shown inFigs. 7 and Such extend ing,,si'de'. edges serve as diametrically! opposed driving Wingsaprojecting radially from the driving or head end of the key .shaft andfare.thus capable of driving a member proyidedtwithlasuitably shaped key-hole which is cooperated therewith; r i

' Referring to Fig. l, the end disc 11:: of the filr'n roll 1ft is-provided .with a key-hole 11b shaped complementally to.the-head end 19 of. the keyshaft and the aforesaid driving wings,providedthereon by the extending side edgesofth'e key 24. Thus, the film roll may besirnply coupled .to the key shaft by moving it to a position such th'atth'e driving end of the key shaft enters the key hole llb'whereupon. the roll maybe driven by manual rotation of theknob 12, and uncoupling of the film roll may be eifcted "in equally simple manner merely by moving the roll axiallyaway from the key shaft.

Without further analysis, it will be seen that the film roll. drive described above achieves the objectives there for outlinedin the foregoing. That isto say, the webfojrmdriving key employed in such a drive gives more positive action than the'prior pin-form driving key, and it's' -,construction, as well asthat of the key shaft, is such that it 'rnay beassembled with the key shaft and disassembledfth'erefr'om. in. exceedingly simple manner. Moreover, a.drivi1igmeans according to the present invention,

is'capable of 'bein'g assembledand disassembled as a Wholev from thev camera,.thus permitting easy repair andlo'r, replacement. when such is required. Finally, the driving; means. ofithe invention may be inexpensively manufactureiand its initial assembly costs are low as comparedito those involved-with prior film roll driving means;

As -many'changes could be made in carying out the above construction without departing'trom th'c scope of the invention, it is intended that all matter contained in the above description or shown in'the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. Means for driving .acamera film roll from a film wind knob mounted externally of the camera comprising, in combination-,a key shaft eXtending'throIigI'i an opening in the frame and 'being'affixed at its outer end to said knob, the: key a shaft beingsprovided adjacenbzitfi inner end with a circular groove and: having;a:diametri al through slot intersecting said groove, a web-formifldriw ing key received in said slot, and an open=endedspring retaining ring seated 'in' said groove and 'co'acti'tig' with said key to secure itagainstbothaxialand radial displacement.

2. Driving means as set forth in claim 1, wherein said key is provided in its; opposite: edgest-witlrzslots shaped and positioned so as .to regist'errwithsaidigtoove" and through-whichthe ring .extends.:.

3. Driving: means asset forthfinclaim ikqwhcreintsaildt key shaft and said keyare eachtprovidediwith: means which operate conjointly to secure the' keytsliaft againsv axial displacement.

4. Driving meansas set forth.int-claim;l,z whereimisaidr key shaft and said key are provided! withi'facingfishouli ders providing axially spacedabutmentslfor meanst'on; the frame, said abutment means preventing axitilfidi'splacement of the'key shaftrelative to frame.

5. Means for drivinga camerazfilm rollxfromcai film' w'md knob mounted externally. ofithecamerafcomprisingg in combination, a. key shaft fextendingithrough an op'en ing in the frame and being affixed at its outer end'tfiisaid" knob, the key shafthaving ai large diameterouter end portion separated "from .a smallerfrdiameter'inner portion by a shoulder located near the inner-- endofi saidlopening and which abuts the outer side of an- 'internal frameflange extending along sai'd openingtatits' inner endf' the inner end portion of the key shaft=beingprovidd"with" a circular groove and 'both said outer-and 'innenend portions having a diametrical slot cutting throughsnid groove, a web-form key receive'd in saidslotand havin'g one end portion of greater width than thedi'ametefof said inner end portion whereby its side edg'esext'end radially therefrom, the other end portion ofsaidkey -'ex"- tending into and being containedwitliim-the' circum ference of the largerdiameter end of the-keyshaft', said radially extending side edges of the key beifig provided with opposite slots disposed in registry 'witlfitliefgroove, a spring retaining ring seated 'in" the-groover'andpassing through 'said' opposite slots, said radiallywxtendlii'gfstde edges terminating in outwardly" facing shbulderfwlficlf abut the inner 'side'of saidinternal' framefianger References Citedhthefilmfthid'patent UNITED STATESQP'ATENTSI.

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