US 2252685 A
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Description (OCR text may contain errors)
Aug. 19, 1941.
D. L. BABCOCK I 2,252,685
FILM srmcme APPARATUS Filed Dec. 2., 1938 Dav/0%. fiabcock INVENT OR Y I h ATTORNEY Patented Aug. 19, 1941- UNITED STATES PATENT OFFICE FIIM S PLICING APPARA'I'UQ A David L. Babcock, Rochester, N. 1., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application December 2,1938, Serial No. 243,605 .5 Claims.. (Cl-15442) I The present invention relates to a cinematographic film splicing apparatus, and more particularly to the hinged connection for the film clamp associated therewith.
One object of the present invention is to provide a film; splicing apparatus which is simple and emcient in operation, and which can, above all, be produced at low cost. Another object is at!) provide such a splicing apparatus with one or more hingedfilm clamps the hinged structure of which is simple to correspond with the low cost of the complete splicing apparatus, but which is eiilcient in operation. And another object is to provide a hinged structure for the film clamp.
all oi'the parts of which, except'a single spring member,.are integral with the hinged parts and are stamped out with said parts: And a further object is to provide a hingedstructure of the type described, the parts of which can be assembled practically without the use of tools and securely interlock with one another. And another object is to provide a hinged structure where the hinged parts are held in their assembled positions by a spring me'mber'which in turn serves as, pintle bearings for the film clamp. And another object is to provide a hinged structure of the type described wherein said spring member in combination with cam portions on ,the -hinged .part integral with the film clamp normally acts to forcesaid clamp toward its film holding position when the same is moved from its raised position, and which exerts a clamping pressure on said clamp when the same is in its film holding position.
v The novel features that I consider characteristic of my invention areset forth with particu larity in the appended-claims.- The invention it- 'sel i,;however, both as to its organization and its objects and advantages thereof, will best be understood from the following description of a specific embodiment when read in connection l-lofFig.2,
' Fig. v4 is a section taken substantially on line Fig; 5 is an enlarged plan view of that portion of the splicing apparatus including the hinged structure for one of the film clamps, andshowing the clamp in its clamping posltion, and Fig. 6 is an elevation of the cutting and scrap ing tool adapted for use with the splicing 'apbase plate proper from a table or like support 1 on which the apparatus might be'positioned.
This apparatus is portable, but the plate is provided with two countersunk openings I! through which screws may be passed it it'should be desired to mount the apparatus onto atable or.
like support. The top of the base plate may be provided with a plurality of film engaging pins 13 spaced from one another longitudinally of the base plate by distances equal to the spacings of the perforations in a cinematogrpahic film strip F,'see Fig. 2, whereby said' pins are adapted to engage said film perforations to locate the film longitudinally oi said base plate. Although only one row of these pins It has been shown, where- ;by the film is engaged only at one margin, two
.rows 01 such pins may be provided, as is well method of: operationptogether with additional 1 .known in the art, so that both margins of film the film strip thereon, see Fig. 2, or to be raised to permit a film to be placed on or removed from said pins. To permit the film clamp n to engage the film F, the same is provided with an aperture l5 through which the pins I! extend when the clamp is in its film holding position.
To provide a proper cutting of the film strip F, the base plate I0 is provided with two elongated slots l6 and I! which extend transversely of the base plate and across the film path thereon. The outside edge of each of these slots I5 and I1 provides a shearing edge along which the film is cut when; the cutting and scraping tool I8, see Fig. 6, which is equal in thickness to the width of saidslot, is inserted edgewise intoeach slot with the end l8 thereof extending through the slot at one end thereof and at an acute angle to the base plate so that its arcuate portion 28 will engage the under side of the base plate 10 at the end ofthe slot and act as a fulcrum point, about which the tool can be pivoted downwardly toward the base and through the slots to cut the film along the shearing edge of each of the slots.
After the two film endshave been trimmed as described, the scrapingand cutting tool is turned edge u of the base plate. The ends :1 of this spring member 28 are turned outwardly as shown, see Fig. 5, to engage the pintle recesses equal to the thickness of the ear 25 so that no reversed end for end and the nose 2! on the end thereof is inserted in the slot IS with the scraping edge 22 of the tool overhanging the shearing edge of said slot, after which the tool is recipnocated in the slot across the surface of the film and adjacent thereto to remove the emulsion from the film. The nose 2| is equal in width to that of the slot It so that when the same is inserted therein 21 and act as pintle bearings for the film clamp. The width of the slot 28 is made substantially spring member 28' is then located against the turned down edge .i I between the under side of no sideway movement of the tool will ensure, and
v the scraping edge 22 is equal to the amount of overlap which the film splice will have so that the correct width of emulsion is removed from the film strip thereby. The end of the tool I8 is cut away as indicated at 28 so as to permit of the nose 2! extending into the slot l8 to serve as a guide for the scraping edge as described. After the film ends have been trimmed and the emulsion has been removed from the end of. one
as described, cement is applied tothe scraped film end and the other filr'n end is removed from its locating pins I3 and replaced on said pins after being advanced longitudinally of the base toward the slots one perforation. Due to the positions of the two shearing edges of the slots l8 and I I relative to each other and the locatin pins I; this single perforation advance of the one film end will give the desired overlap for the splice which will be equal to the width of emulsion scraped from the other film end. Pressure may be applied to the splice in any suitable manner during the time the cement is drying, and one way of inducing this pressure would be to lay the tool fiatwise across the splice and press down thereon.
The splicing apparatus as a whole or its method of operation forms-no part of the present inventhe base platev l8 and the boss 88 after which the ends of the spring member may be retracted by a special tool until they snap. into said pintle recesses. The inherent resiliency of the spring member 28 will serve to hold the parts in this assembled position, and -the spring member will normally force the ears 25 longitudinally of the slots 28 so that the forward edge 82 of eachof said ears will be pressed into engagement with the base plate It at the end of its respective slot 26. I
It is desirable that the film clamp will normally be moved to its clamping position when the same is not in its upright posltion,and that the same, when in its film holding position, will exert a pressure on the film strip. The hinged structure is so formed and arranged that these functions are performed by the hinge structure itself. The forward edge 82 of each ear 25 is formed so as to provide a fairly steep cam portion 85, a gradual cam portion 88 continues with said cam portion 85, and a break 81. Referring now to Fig. 3, when the film clamp I4 is in: its full raised position the above the lower comer 88 of the base plate at the end of the slot 28 and the force of the spring the total cost of the'splicing apparatuswill not be substantially increased due to its incorporation thereon.
Coming now to the invention, each film clamp is provided at its rear end with a pair-of spaced downwardly depending ears 25 which extend through a pair of slots 28 in the base plate 18 adjacent one down turned edge thereof. These ears 28 may be stamped out with the film clamp 18 and turned down afterward to make side of the base plate It at therear of the slot member 28 being applied slightly below said base in this position will tend to hold the film clamp in its raised position, or even tend to rotate it further back about the pintle bearings. Backward movement of the film clamp I8 is limited, however, by the engagement of the rear edge 88 of the clamp withthat portion of the top of the base plate l8 between the slots 28.
Now when the clamp I l is moved downwardly from its upright'posltion enough to bring the cam portion 88 intoengagement with the corner 88 at the end of the slot 28, the force of the spring member 28 will tend to force said cam portion against said corner in the manner of'a wedge, and the cam portion will resolve this spring pressure into a component force which will tend about its pintle bearings this cam surface may 28 therein. and a boss 88 formed in the down be gradual. when the clamp has rotated nearly to its holding position, the cam portion comes into engagement with the corner 88, and since this cam portion is at a fairly steep angle with respect to said corner 88, the component force of the spring pressure resolved thereby will be considerably stronger than that resolved by the snapped to its film holding position through this last part of its movement. The cam portion I is in eifect a straight portion at a fairly steep angle to the corner 38 so that the force of the spring member intended to press the ear under a 4 film holding position the corner]! has not reached the end of the cam portion 35.- Due'to this fact, the spring member will constantly tend to force .the ears under the corner 38, even when the clamp is in its film holding position, so
for pivoting said clamp member to said base member and normally acting to move the same to its clamping position relative to the top of said Y base plate, said means including a' double-ended spring hinge pintle, thedntermediate portion thereof engaging said turned down edge between that there will be a component force tending to rotate the clamp about its pintle bearings when the same is in its film holding position, which force will give the desired That portion of each of the film clamps ll adapted to overlie the picture area of the film strip when in holdingposition may be raised as indicated at Ill so that when not in use the tool I! may be slid under the clamp between the same and the base plate id, as shown in ,Fig. l, for the purpose of keeping the complete apparatus intact or for packing purposes. The free ends of the film clamp may project beyond the edge of the baseplate II, as indicated at ll, so that they may be easily grasped by the operator to be raised.
pressing action ofthe 'filmclamp on the film strip.
said slots, and each-of the ends thereof engaging a portion of one of said base plate. a
2. A film splicing block comprising abase plate plate having a turneddown edge, and provided with a pair of spaced elongated slots adjacent said turned down edge and extending away therefrom, means on saidbase plate for engaging and positioning a film strip for operations necessary said ears extending below to splicing, a clamp member,- a pair of spaced;
ears depending downwardly from one end of said clamp member, and each one thereof extending V through one of said spaced elongated slots, each of said ears provided with a pintle recess'located I below said base plate, and a double ended spring member having its intermediate portion engaging that portion of. said turned down edge between said-slots, andits ends turned outwardly to enspring member tends to force said ears into abut- It will be apparent from the above description that the novel hinge structure'for the film clamp v can be produced at low cost in keeping with the complete splicing apparatus, and since the parts thereof are integral withthe parts of the apparatus, with the exception of the spring member,
they can be stamped out at the same time as said gagesai'd pintle recesses in said ears to provide pintle bearings for said clamp, whereby said ment with one end of said slots. e
3. A film splicing block comprising a base plate having a turned down edge, and provided with a pair of spaced; elongated slots adjacent said turned down edge and extending away therefrom, means on said base plate for engaging and positioning a film stripfor operations necessary to splicing, a boss projecting inwardly from said turned down edge and located between said slots and spaced below the bottom of saidbase plate,
parts; thereby eliminating separate operatlons' which are costly in production. Further, the ease withwhich this hinge structure can be assembled cuts down. any assembly charge per unit almost to'nothing. Although this hinge structure is very simple and can be produced at low cost, it nevertheless is emcient inop'eration. It is adapted to hold the film clamp in its full raised position, move the same toward its holding position when moved from said full raised position, and finally it is adapted to apply pressure to the film strip when in its film holding position; all features desirable of a film clamp on a splicing apparatus, and all of which features are only found in more expensive and more complicated hinge struc- Although I have shown and described a certain specific embodiment of my invention, I am" fully aware that many modifications thereof are possible. My invention, therefore, is not to be restricted except insofar as is necessitated by the l splicing, aclamp member for holding said film prior art and 'by the spirit of the appended claims.
Having thus described my invention what I claim is new and desire to secure by Iiettersv Par ent of the United States is:-
' pair of spaced elongated slots adjacent said turned down edge and extending away therefrom, means on said base plate for engaging and positioning a film strip for operations necessary for said clamp, whereby said spring member is said base plate,- a pair of spaced ears depending downwardlyfrom one end of saidclamp member, a and each thereof extending through one of said. slots, eachof said ears provided with a pintle recess located below said base plate, and a double ended spring .member having its intermediate portion engaging said turned down edge between the underside of saidbase plate and said boss, and its ends turned outwardly to engage'said pintle recesses in said ears to provide pintle bearings held in its assembled position by its own resiliencywhich also'normally holds each of said ears against one end of its respective slot. 7 4. ,A film splicing block comprising a base plate having a,turned downedge, and provided with a pair of spaced elongated slots adjacent said turned down edge and extending away therefrom, .lneans on said base plate for engaging-and positioning-a film strip for operations necessary to strip on said base plate, a pair of 'spacedears depending downwardly from one end of said clamp member and each one thereof extending member having its intermediate portion" engaging that portion ofsaid turned downedge between said slots, and its ends turned outwardly to e'n sage said pintle recesses to provide pintle bearto splicing, a clamp member for holding s id film strip on said base plate, a pair of spaced ears depending downwardly from one-end of said clamp member and each one. thereof extending of each earabutting the end of said slots pro-- through one of said spaced elongated slots, means lugs for said clamp, whereby said spring member normally forces one edge of each oi said ears into abutment with one end of said slots, that edge vided with a cam portion which-when engaging the end of said slots resolves the force of said spring member into a component force which tends to rotate said clamp into its clamping position about said pintle bearings, and which exerts having a turned down edge, and provided with a pair of spaced elongated slots adjacent said turned down edge and extending away therefrom, 7
means on said base plate for engaging and positioning a fllm strip for operations necessary to splicing, a clamp member for holding said film strip on said base plate, a pair of spaced ears depending downwardly from one end oi said clamp'member and each one thereof extending through one of said spaced elongated slots, each of said ears provided with a pintle recess located below said base plate, a double ended spring member having its intermediate portion engaging that portion of said turned down edge between said slots, and its ends turned outwardly to engage said pintle recesses to provide pintle bearings for said clamp, whereby said spring member normally i'orces one edge oi each of said ears into abutment with the end of said slots, that edge 01' each'ear abutting the end of said slots provided with a first cam surface which when engaging the end of said slots resolves the force or said spring into a component ioroe which tends to rotate said clamp toward its clamping position about said pintle bearings, and a second cam portion continuous with said first cam portion, and which when engaging the end oi said slots resolves the force oi said spring member intoa component force greater than that induced by said first mentioned cam surface, and which is adapted to snap the clamp into its clamping position and induce a constant pressure thereon while