US892547A - Light-shield for moving-picture machines. - Google Patents

Description

PATBNTED JULY 7, 1908 J. J. 'PINK.

MOVING PICTURE MACHINES. APPLICATION nun p01. 2, 1907.

LIGHT SHIELD FOR 2 SHBETSSHEET 1.

PA-TBNTEDJULY 7, 1908. J. J. PINK.

LIGHT SHIELD FOR MOVING PICTURE APPLICATION TILED OCT.2. 1907- MAGHI'NES.

2 SHEETS-QUIET 2 ull I ig/(02",

.J'oiui] 73m Z a in the course of this specification and t film comesto a position of rest in the'path of when the machine is not UNITED STATES PATENT OFFICE.

JOHN -IIi\'l\', Ul CHICAGO, ILLINOIS, A SSICXO It 'I() VIASCOIE MANUFACTURING COMPANY,

OF CHICAGO, ILLINOIS,

.\ CORPORATION OF OKLAHOMA.

LIGHT-SHIELD FOR MOVING-PICTURE MACHINES.

Application filed October 2,

To all whom it may concern:

Be it known that I, JOHN J. PINK, a citizen of the United States, residing in the city of Chicago, in the county of Cook and State of" Illinois, have invented certain new and usel'ul Improvements in Light-Shields for Moving-Picture Machines, of which the following is a full, clear, and exact description.

My invention relates to certain new and useful improvements in light shields for moving picture machines, and designs to provide means for automatically shutting oil, or rather intercepting the light from the lamp, which forms part of the outfit, whenever the machine ceases to o erate, or .is running much below its norma speed.

In moving picture machines, the rays of light are concentrated at a point-adjacent to the film or ribbon, and inasmuch as the latter isusually composed of a highly imflammable and combustible materjal, there is constant (1211 'er of its ignition from the intense heat of the ight; when, however, the film is in mo tion the danger is avoided but in case the gcr-is most imminent. I

One of the objects of this invention is to provide a light shield operable by the moving picture machine itself and so arranged that in operation the shield will be in position to intercept the rays the concentrated ravs of light then the dan- Specification of Letters Patent.

oflight from the lamp, but that when the machine is in operation the shield is thereby I moved into a position outside of the rays of light.

.-\nother-objectis to provide a shield that is operable by a hand operated or motor operatcd picture machine.

Another object is to provide a shield which is operated with very small increase of power.

Another object-is to provide aishicld that is operated by gravity to bring it into the light intercepting position.

Other objects and advantages will a )pear he cssentials'features will be .more )articula-rly pointed out in the claims appended thereto.

-The invention is fully described in the following specification and clearly illustrated in the drawings accompanying the same, in which Figure 1 is a side view of a moving picture main shaft 15 that Jinn-lune, a lightshictd, a lamp house arid a metorforoperating themachine. Fig.2is aview Patented July 7, 1908. 1907. Serial No. 395,473.

partly in plan and partly in horizontal section showing the belt connection between the picture machine and the-shield, the line of sec tion being indicated at 22 Fig. 1. Fig. 3 is a face view of the shield mechanism looking in the direction of the arrow 3, in Fig. 1,-and showing the shield in the intercepting position. Fig. 4 is a vertical cross section taken on line 44 Fig. 3, the shield being shown in its raised position in full lines, and in the intercepting position in dotted lines. Fig. 5 is a face view of a fragment of the shield mechanism, showing the governor cam in a position occupied when the machine is running. Fig. 6 is a face view of the cam disk, and Fig. 7 is adctail section of the cam disk and connecting parts.

In Figs. 1 and '2 A, represents a moving picture machine, of the type shown and de Y scribed in Letters Patent of the 'United States No. 850,567, issued April 16, 1907, upon an invention of J. A. Crosby and myself. This machinChas a magazine 1], in which is journaled a spool that carries the film 12, and from which the latter is unwound as it passes through the machine.

As is usual the film passes around a number of guide spools 13 and through a guiding mechanism- 14 where it is held in a flat condition. At this point the light passes through the film and through a lens 15, from which it is projected upon the screen or ourtain. A (rank 16 mounted upon a shaft 16, is provided for the operation of'the machine by hand and a'pulley 17 is also provided for the operation oi" the machine by means of other motive power; here sl'i'own as an electric motor '20, geared to -thc machine by moans-of abolt 21. which passes around the pulley 17. which pulley is secured upon the forms part of theo eruting mechanism of the machine. The s aft 18 carries a Fly wheel 18. and a secondpulley 19, which is belted lo the shield mechanism and said shalt may be considered as the motor operated driving shaft and the shaft 16 as the hand operated driving shaft, the two being geared together so as to operate in unison. The'construction, of machines of this type is well known and is fully described in the patent above referred to and forgthis reason requires no further description so far as this specification is concerned.

Behind the rwhirw a less; hearse B, of ordinary form, which is arranged to furnish 65 the arm 81 being fast upon a rock shaft 83 the light 21:2? projecting the pictures upon the journaled in the u per ends of the standscrccn. The lamp house and machine are ardsfQ'PA light shield or shutter 90, is secured preferably mounted upon a suitably supupon the rock shaft 83, in any suitable man ported base 30, and between them is placed ner and is of such size as to completely inter- 5 the shield mechanism (J, which may' also be cept the rays of light issuing from the lamp 70 secured upon the base '30. house. A weight 84is' adjustably secured Referring to Figs. 3 to 7 inclusive, 40, '40, upon an arm 85 which extends back from the represent two standards that are secured to light shield and is secured upon the shaft 83, the base, said standards being, preferably, and said weight forms a counterbalance for 10 vertically ad'ustable so as to vary the posithe light shield. The arm 80 is so posi- 75 tion of the'sliield proper and as shown the tioned with respect to the notch 73, that it standards are each made in two pieces bolted will occu y a raised position whenever the together, the bolts passing through slots in notch rid the adjacent ends of the standard sections. the light shield in its raised position, permit- The upper ends of the standards are conting the rays of light from the lamp to pass nectcd by an arch piece -11, to make a rigid to and through the'film and lens. frame work for the support of the operating The operation of the machine is as folparts. A shaft 50, journalcd in the standlowsz- Vhenever the machine is in a posiards 40, 40, and is held against longitudinal movement therein by means of two collars 51, arranged u on either side of the standard 40 and securec upon the shaft by means of set nuts 52. Shield operating mechanism is mounted u on the shaft :30 and is connected to the mac 1ine so as to be operated thereby and said mechanism will be presently described. As shown a shiftable belt pulley 60, is loosely mounted upon said shaft 50 and is connected to the driving pulley 19 of the machine by means of a belt 61. Said pulley 60, is provided with a. beveled friction face 62, adapted for engagement with a beveled friction face 71 of a cam disk 70, that is secured upon a spindle 72, journaled in a hollow-stud 42 upon the standard The pulley 60 is further provided with a hub 63,

' to which are secured a number of s wring arms 64 which carry weights 65, and have their other ends secured upon a collar 66 fast upon 40 the shaft 50. This structure forms a centrifugal governor which when running at high speed moves the beveled friction face 62, of the pulley ('50, into trictioi'zal engagement with the beveled friction face of the cam disk, thereby turning the same upon its axis. Said disk is formed with a notch 73 in its periphery, which notch is of such size and shape as to ride upon the cylindrical face 67 of the pulley 60. It will be perfectly obvious that when the notch has won brought into register with. the pulley 60 the lattermay be moved across the plane of the cam disk, thereby bringing the body of the pulley into the notch of the cam. disk. When brought to this osition, any further rotation of the cam disl: becomes impossible, it being locked by reason of thecngagcment of'the pulley with the notch 73 of the cam disk. The cam disk is therefore maintaI -vd in such position so long as the notch rides upon the periphery 67 of the pulley. off the li ht. It is perfectly obvious that as The spindle 72 of the cam disk Carries soon as't 1e machine ceases to run, the light an arm upon its outer end which arm is shield will imrswdia-tely fa li, thereby autoconnected to a second 8 a iink 82, I mgtically shutting off the light.

gagement and the light shield is hanging down from the rock shaft 83, and in the path of the rays of light from the lamp house. If now, the crank 16, be turned or the pulley 17 be rotated by the motor at the proper s egd to operate the machine, the governor connection with the machine, the shifting pullev 60, will be forced against the cam disk y the action of the governor, and the eled friction faces of the pulley and cam disk, thereby swinging the arm 80 upward, raising the link 82, turning the arm 81, shaft 0 83, and consequently raising thelight shield 90 out of the rays of light from the lamp house. As soon as the notch 73 of the cam disk comes-into register with the periphery 67 of the pulley 60, the latteris drawn under 05 the cam disk, causing the notch to ride upon the periphery of the pulley and thereby maintaining the light shield in its raised or operative position; and it will be somain tainted as long as the machine is being opereither belt is broken, or the operator ceases to turn the-crank, the shaft '50 will stop, the spring arms 6 1 will straighten out, thereby moving the pulley 60 out of the notch 73, 1 15 allowing the'cam disk to turn upon its axis .and allowing the light shield to fall b its own weight, thereby shutting off the ight from'the film 'andavoiding any danger of ignition from the heat of the light. It sometimes happens that the film itself becomes unmanageable and unwinds from its spool and falls into path of the rays of obli ed to stop the machine without turning am aware that various alterations and' Letters Patent-f- J-'-and constructed to actuate the first named- L tion.

modifications of this device are possible without departing from the spirit of my invention and I do not therefore desire to limit myself to the exact construction shown and described.

I claim as new and desire to secure by 1. In a'device of the class described, the combination of a light shield, a member connected ,to the light shield and containing an enga ement means, a rotatable and slidable 'mem er having an engagement means coact- --ing with said first name engagement means engagement means to raise the shield, and means for throwing said engagement means out of gear when the shield is m'raised posi- 2. In a device of the -class described, the combination of a light shield, a rotatable and .slidable member, a notched cam disk arranged to be turned by frictional engagement'therewith, and connections between the cam disk and light shield.

"3. In ardevice of the class described, the combination of a light shield, a shiftable v friction device controlled by the operation of a moving picture machine, and including a governor arranged to shift said friction de-' vice when run at 'high s cod, and a notched disk connected to the light shield and arranged to be operated by the shiftable friction device to operate the-light shield.

4. In a device of the class described, the combination of a light shield, arotatable member operated by a suitable moving picture machine, and a friction member connected with the light shield, and operated,

by said rotatable member, said rotatable member and friction member being relatively mm'able in a longitudinal direction with respect to their axes of rotation and said friction member being constructed and arranged to be thrown out of gear with the having ran e ate by a moving rotatable member when the shield is raised. 5. In a device of. the class described, the

combination of a shield, a shiftable pulley,

ada ted to be geared to a moving picture mac inc and rotated thereby, a governor operated b said pulley to-shift the same, a friction dis engaged by said ulley and arranged to be. parti-ally rotate thereby and connections between said disk and shield.

' 6'. In a device of the class described, the combination of a shield, a shiftable pulley,

a beveled friction face, a governor 'arto shift said pulley, mechanism operate by a moving icture machine arranged to operate the ul ey, a cam disk having a eripheral notc engaged by said friction ace, and connections between the cam disk and shield.

7. Ina device of the class described, the combination of a shield, a shiftable pulley havin a beveled friction face, a governor'arran e to shift said pulley, mechanism operpicture machine arranged to rotate said pul ey, a notched cam disk enaged by said friction face and connections between the cam disk and shield.

8. In a device of the class,described, the

combination'of ashield, a pulley having a beveled frictionface, mechanism for rotating said pulley operated by amoving picture machine, a overnor arranged'to shift said ulley, a dis having a' beveled face engaged by the beveled face of the pulley and 'containing a peripheral notch, and connections between the disk and shield.

In witness whereof, I have executed the above application for Letters Patent at Chicago, county of Cook and State of Illinois, this 26th day of September 1907.

JOHN J. PINK.

Witnesses:

CHARLES U. SHERVEY, FRANK W. BEMM.

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