US1233816A - Shutter for moving-picture machines. - Google Patents

Description

C. R. SMITH.

SHUTTER FOR MOVING PICTURE MACHINES,

APPLICATION FILED 1AN.24.1911.

.- WIT/VESSEL? C. H. SMITH.

sHumR Foa MOVING PICTURE MACHINES.

APPLICATION FILED JAN.24, 1917.

1,283,8 1 6. Patented July 17, 1917.

2 SHEETS-SHEET 2.

BY f' ATTORNEYS i0 on the stem 7 of the tmaf D STATES Infra.'rrrl OFFICE.

OHARLES SMITH, OF FORT SCOTT, KANSAS, ASSIGNOR OF ONE-HALF T0 FRANK B.

. SMITH, 0F HUME, MISSOURI.

SHUTTEB FOB MOVING-PICTURE MACHINES.

Specification of Letters Patent.

Application led January 24, 1817. Serial No. 144,156.

To all whom it may concern.'

Be it lmown that I, CHARLES R. Sm'rrr, a citizen of the United States, and a resident of Fort Scott, in the county of Bour- 5 bon and State of Kansas, have invented a new and Improved Shutter for Moving- Picture Machines, of which the following is a full, clear, and exact description. My invention relates to shutters vfor moving-picture machines. An object thereof. 1s to provide a simple, easily operated de vlce which may be applied to existing machlnes without any alteration to the machines. A further ob]ect of the invention is to provide a shutter that will give a better dis solving effect of light which'is less noticeable by the eye.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed. In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a longitudinal section through the shutter mechanism;

Fig. 2 is a front elevation of the shutter; Fig. 3 is a cross section on line 3 3, Fig. 1; Fig. 4 is a perspective view of the pinion carrier which forms the timing device of the shutter;

Fig. 5 is a perspective view of the inner blade carrier; Fig. 6 is an enlarged front elevation of the said blade carrier with the pinion carrier .provided therein; and Fig. 7 is an elevation of a shutter blade. Referring to the drawings, 6 is a driving shaft which is free to revolve in a tubular stem 7 of the T-shaped inion carrier 8. The end of the stem 7 of t e pinion carrier is threaded into a bracket justable on the slotted arm 10 of the support 11, the support being rigidly secured to the machine 12.

A blade carrier 13 is mounted to revolve pinion carrier. It is preferably provided with a tubular eXtension 14, the end of whichextension bears -on a collar 15 threaded onto the stem 7 in front of the bracket 9 and secured to the .5 sleeve by a set screw 16 or any other suitable means. The bearings 17 of the blade carrier 13 and the extension 14 are preferably ball bearings. The inner face ofthe carrier 13 is preferably recessed and therein a gear 18 is provided which meshes with pinions 19 revoluble in the carrier 8. A similarblade carrier 20 is provided opposite the blade carrier 13.- It has also a ear 21 in mesh with the pinions 19 and a caring surface 17 on the sleeve of the pinion carrier, but its tubular extension 22 lits snugly onto the shaft 6 and is secured thereto by a set screw 23 so as to participate in the rotation of the shaft.

A circular blade 211 is secured to each of the carriers. Each of the blades is provided with sectorial openings 25. the sides of which form an angle of about 15 with a radius intersecting the remote end of the side. The width of said openings 25 are substantially 1% times that of the part 26 spacing the openings and which forms the effective part of the blade for shutting olf the light. It will be noted that the blades 24 are so mounted on their carriers that dur- `lng their revolutions in opposite directions the openings 25 thereof will coincide yat intervals.

The timing of the blades 24 relative to the lens opening 27 is obtained by the displacement of the pinion carrier 8 in the bracket 9. To displace and retain the pinion carrier 8 in the displaced position in the bracket 9, a clamp 28 is secured 'to the collar 15. This clamp has a resilient extension 29 which normally bears in an indented surface 30 of a sector 31 extending from the bracket 9. By turning the extension 29 the pinion carrier 8 can be moved from the position shown in full line in Fig. 6 to the position shown in dotted line in said figure, and whereby the meeting of the edges of the blades 24.- may be caused to be in the center above or below the center of the lens opening 27.

The end of the stem 7 is provided with a ball race or collar'32 with which coperates a ball race 33 secured t0 the shaft 6. It will be noted that whenever the pinion carrier 8 is displaced within the bracket 9 the shaft 6 will participate in the longitudinal displacement thereof so that the relation between the various movable parts of the shutter remain undisturbed. The slotted arm 10 permits the adjustment of the bracket 9 thereupon so that the distance of the blades 24 from the lens opening 27 may be Varied in accordance with the spread of the lens and its focal length.

I claim:

1. A shutter for moving-picture machines, comprising a driving shaft, a T-shaped pinion carrier havin a tubular stem free to revolve on said shaft, abracket into which the end of said tubular stem is threaded, a pinion in each of the shoulders ofthe carrier, a blade carrier secured to the shaft and having a gear surface in mesh with the pinions, a similar carrier revoluble on the stem ofthe pinion carrier and having a gear surface in mesh with the pinions, aperturedvblades secured to the carriers, means secured to the A stem of the pinion carrier whereby the same may be threaded in the bracket, and an indented sector associated with the bracket, said means for threading the pinion carrierv having a resilient portion normally in engagement with the sector, whereby the pinion carrler is prevented from revolving on the shaft and wherebythe relative position of the blades may be adjusted substantially as and for the purpose set forth.

2.- In combination with a moving-picture machine, adriving shaft, a shutter mounted on the shaft, a bracket for the shutter, a slotted arm for supporting said bracket, and

means whereby said bracket may be adjusted on the slotted arm substantially as and for the purpose set forth.,

3. In combination with a moving-picture,

machine, a driving shaft, a double-disk shutter carried by and driven from' the shaft, a bracket for supporting the shutter, means for moving the shutter to and from the bracket to vary the .relation between the two disks ofthe shutter, a support having a f' comprising a driving shaft, a pinion carrier having a tubular stem free to revolve on said shaft, a pinion on the carrier, a pair of facing shutter blades each having a gear in mesh with the pinion, and means associated with the stem of the pinion carrier for preventing its rotation and displacing the pinion carrier angularly on the shaft.

In testimony whereof 1 have signed my name to this specicationin the presence of y two subscribing witnesses.

CHARLES R. SMTH.

Witnesses:

JOHN E. HALL, E. M. HARRISO

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