US1142103A - Safety-shutter for motion-picture machines. - Google Patents

Description

F. R. KLINK.

SAFETY SHUTTER FOR MGTIQN PICTURE MACHihEL..

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APPLICATION FILED OCT. 8. i913. 1,142,103. Pmnted June 8,1915.

2 SHEETS-SHEET 2- SHOT/110,50

safety shutter whereb y UNITED sTATEs PATNT onirica; y

FEDEBIOK R. KLINK, 0F CANTON, OHIO, ASSIGNOB OFONE-THIBI) TO JOHN A.

rBIERNOWER. ANDwONE-THIBD TO VALENTINE L. -NEY, BOTH OF CANTON, OHIO.

SAFETY-SHUTTER FOR MOTION-PICTURE MACHINES.

`Applicationiled. October 8,`

To all whom, it may concern Be it known that I, FREDERICK R. KLINK, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a lnew and useful Safety Shutter for Motion Picture Ma chines, of which the following is a specification.

My invention relates to improvements in motion picture machines and especially to a to prevent ignition of the film in cases of breakage or slackness resulting from defective operation of the Hlm-moving mechanism.

The objects vof the invention are to generally improve devices of the character mentioned, to provide means whereby, when the film breaks, or becomes slack, the light from the condensing lens may be instantly cut off cnas not to impinge upon the inflammable Further objects are to so construct the device that it may be small, compact and will not interfere in any yway with the operation ofthe machine upon which it is arranged.

Further, it is desired -to accomplish the result intended in an instantaneous and automatic manner while being absolutely non'- injurious 4to the film. l

These objects, together with other objects readily apparent to those skilled in the art, may be attained by the construction disclosed in the accompanying drawings inN which for the purpose of illustration I have shownthat form of the'device appropriate foruse on a N o. 6A Cameragraph, of wellknown construction.

In the drawings Figure 1 is a side elevation of a motion picture machine illustrating the application of my invention. 4iig. 2 is a front elevation of the tension-contact device and one of the film guide rollers. Fig. 3 is a side elevation of the same, also showing the tension-contact device in position to actuate the shutter. Fig.v 4 is a horizontal enlarged sectional view on the line Jr-4 of Fig. 2. Fig. 5 is an enlarged sectional view on the line 5*--5 of 2. Fig. 6isl a front elevation of the shutter somewhat enlarged. Fig. 7 is a rear view of the shutter arm. Fig. 8 is a side view ofthe same. Fig. 9 is a front end view of the shutternsupporting stem. Fig. 10 yis a side view of the same. Fig.v11 isa wiring diagram showing how the ten- ,speineation af Letters Patent.

Patented JuneS, 191'5. 1913. serial 1ro. 793.9131.

sion-contact device and shutter are included in the electric circuit for operating the device. Fig. 12 is .a perspective view'of the tensinn-contact device and the two film guide rollers. 1

Throughout the several views similar reference `'numerals indicate similar parts.

'Morespecifically describing the construction disclosed in the said drawings, the numeral 1 indicates generally the lamp house, the numeral 2 the condenser hood, the numeral 3 the upper film magazine, the nu meral 4 the lower film magazine and the numeral 5, generally the machine head. All of these parts, in the relation shown-are to be found'in motion picture machines now in common use andare not claimed herein.

As will`be understood by those skilled inl the art the film 6 is unwound from a reel in the upper lm magazine, passes through the mechanism of the machine head, where the` light issuing from the lamp h useL through the condensing vlens impinges upon it, and thence passes to the take-up reel in the lower film magazine. As clearly shown in Fig. 1 the film passes from the take-up feed sprocket 7 downwardly through the base 8, on theaupper surface of which are arranged the film- guide rollers 9 and 10. 'Between the sprocket 7 and said guide rollers the film is maintained taut by reason of the neces- -sary tension in drawing the -same through the machine head and onto the take-up reel. When the film breaks, however, that portion of it between the sprocket 7 and said guide rollers either separates entirely or instantly becomes slack'. The tension of the film between said sprocket and rollers is-therefore l a most certain' criterion of the said film with respect to breakage.

the condition of I therefore propose, by the present invention, to utilize a ycombination of electrical and mechanical means adapted to automatically cut off the light issuing from the condensing lens the instant that the film intermediatethe sprocket 7 and rollers 9 and 10 becomes slack or separated.

Such means as just .described comprises a shutter generally indicated by the reference numeral 11 arranged iupon the condenser hood and normally tending to move into p0- sition to cut ofi' the light issuing from the condensing lens. Said shutter is, however, prevented from movement into such position by means adapted to be actuated by `a cur-V ber 13. 4 Connected' to the portion 16 is a pin 24 round hub 14 which provides with the projecting collared portion 16 andv at the other end to the in- 17. At the free end of 18 is rotatably mountlixedly connected ner end of the arm said arm, on the screw ed the roller 19.

Upon the hub 14 is coiled the spring 20, one end of which is fastened to the member 13 arin 17 and normally tends to pivotally move said arm with the shaft 15 into the forward position illustrated in dotted lines in Fig. 3-

Below .the hub 14 the binding post 21 is connected to the member 13, as by meansof the insulating washers and thimble at 22 and the screw 23, whereby said binding post makes no conductivecontact with the .mem-

adapted to engage and form conductive contact with the binding post 21 when the arm 17 is in the forward position, as illustrated in dotted lines in Fig. 3. Y

The base 12 is firmly connected to some fixed portion of the motion picture machine, as for instance the support for the roller 10, as illustrated in Fig. 5, and the roller 19 is adapted to engage the lm 6 intermediate the sprocket 7 and rollers 9 and 10, whereby held in the upright the arm 17 is normally in Figs 2 and 3,

position shown particularly and in full lines in Fig. 3. tension of the film 6 is suilicient to overcome the tension of the spring 20; the arm 17 will` be maintained in said upright position, but

should said film break or become slack the Y roller 19 will be no longer restrained thereby and the spring. 20 willV instantly movel said roller forward and downward into the position illustrated in dotted lines in Fig. 3, whereupon conductive contact will be made between the pin 24 and binding post 21.

' Referring, now, to the mechanism upon the condenser hood'2,it will be noted that a base 2 5, preferably Aof brass or other nonmagnetic material is provided, and adapted to. be connected `1n any suitable mechanical manner .to the side of the hood 2.

Formed integrallywith the base' 25, or xedly connected thereto, is a forward projection 26, lying in tleplane ofthe base 25,

while the other end is connected to thev So long as the.

and provided with two spaced, laterally extending flanges 27 and 28.

Fixedly mounted upon the base 25 is an electro-magnet 29 provided with the lpole pieces 30. One of the ends 31 of the magnet winding is connected to the binding post 32 while the other end 33 isconnected to the binding post 34. The pole :pieces 30 are somewhat rearwardly spaced from the flange 28 and an armature 35 is arranged intermediate the flange 28 and said pole pieces. `Fixedly connected to said armature is a trip pin 36 apertures in the fianges 27 and 28, within which apertures it is longitudinally slidable. If'desired the armature 36 may also be provided With additional guide` pins 37 slidably extending through spaced apertures in the fiange 28. A coiled spring 38 arranged upon the trip pin 36 intermediate the flanges nected to said pin 36, and by bearing against which extends forwardly through 27 and 28 has its forward -end conthe flange 28 normally urges the pin 37 with the armature 35 to its most forward posi tion. The armature 35 and pin 36 are, however, adapt'ed to be drawn backwardly against the tension of the spring 38 when the` magnet 29 is energized.

For the purpose of preventing. actual con tact of the armature 35 with the pole pieces 30 some non-magnetic substance should be interposed between' said'armature and pole pieces. This may be accomplished by the attachment of small pieces of non-magnetic material, such as brass or aluminum to either the pole pieces or the armature. In the' drawings I have illustrated such pieces 39, as attached to the armature.

Connected to the lower portion of the flange 27, the shutter supporting stein 40 projects forwardly. Said stem is preferably round and tubularas shown in Fig. 9, and at the forward end is provided with a quadrantal projection 41. j

Extending through the stem 40 and the flange 27 is a 'connecting' screw 42, which at its forward end extends also through the central aperture 43 of the shutter arm 44 for the purpose of pivotally connecting said arm to the stem 40.

The face of the arm 44 engaging the for.

`ward end of the stem 40 is provided with a half-circular projection 45 adapted to lit into the three-quarter recess 46 on the end of the stem 40 produced by the projection 41. Said projection 41 will thus enter thel half-.circular recess 47,. and, when the arm 44 and stem 40 are connected by means of the screw 42, the arm 44 is adapted to pivotally move, such pivotal movement being restricted toa one-quarter revolution of the arm 44 about the screw 42. The projection 41 is so' disposed that the limitation mentioned will permit the arm 44 to assume the vertical position illustrated in full lines in be raised out of the tion, as hereinbefore described, and. the

Fig. 6 or the horizontal position illustrated in dotted' lines in Fig. 8. When inthe vertical position the shutter proper 48, preferably consisting of a sheet metal disk, will path of the light emanating from the condensing lens, whereas, when said arm is in the horizontal position, as shown in dotted .lines in Fig. 6, said shutter will completely cut oi said light.

Connected to the arm 44 is a curved member 49 in which is arranged af groove 50 on a curved line concentric with the lscrew 42. The forward end of the trip pin 36 is adapted to be seated inl said groove 50, and at lthe end of said groove on the arm 44'is a deeper recess 51, constituting a notch into which the forward end of the pin 36 extends to hold v"the shutter in the raised or vertical position. Coiled about the stem 40, with one of its ends connected to the fiange 27 and the other connected to the arm 44 is the sp1-ing 52,

which normally urges the arm 44 into the) horizontal position to cut off the light.

Connected to the shutter Aproper 48 is the small knob 53 whereby to conveniently, manually raise the shutter into the vertical position. As the shutter is raised from the horizontal to the vertical position it will be understood that the forward end ogfthe pin 36 rides along the curved groovei50 until it drops into the recess 51. The shutter will then be held in vertical position, being restrained by the pin 36, until such time as the magnet 29 is energized to draw the armature 35 and pin 36 backward. It will beunderstood that in any position of the shutter 48 the pin 36 'cannot move farther forwardly than the member 49, in the groove 50 of which the forward end ofthe pin 36 is constantly seated.

In wiring the device some source of current, as the battery 54, shown in Fig..11, should be pi'ovided. From one side vof said battery the wire 55 may lead directly to the binding post 32. From the wire 56 may leadto switch the wire 59 may lead to the binding post 21. When the switch 58 is closed, it will .be noted that a circuit is completed provided the larm Yis in the lower, horizontal position, wi the pin 24 makingcontact with the binding post 21.

When the moving picture machine is not in operation or is not provided with a iilm, it may be desired to open the switch 58 to prevent unnecessary flow of current. When the film is in the machine, however, the arm 17 kwill be normally held 1n upright posiswitch 58 should then bel closed so that should the break orbecome slack the lcircuit may be closed by the operation of H the'arm 17 t as hereinbefore described andthe said support, engaging said groove,

the binding post 3 4 the base 12. From i the other poleof the battery 54 the' wire 57 may lead toY a switch 58, and from said so as to cutoii` the light the forward position instantaneously, as in thel case of a broken film. It will thus be seen that my invented device affords protect tion against ignition of the film under either of the dan erous conditions indicated.

.It should be pointed out that the invention herein described is capable of application to many other forms of apparatus than the No. 6A Cameragraph shown, and even in the case of this particular machine I do not desire to be limited to the details of construction herein disclosed, for while such construction is the best form in which I have contemplated embodying my invention, it will be understood that many changes may be made as circaqmstances require or experience suggests without departing from the spirit of the invention, within the scope of the appended claims.

I claim 1. In a device of the character described, a support, a shutter, a shutter arm connected thereto and having pivotal connection with said support, a curved member connected to said shutter arm and provided with a groove concentric with the axis of pivotal connection of said shutter arm and support said grooves providedv with a recessedvprtion, and atrip pin lconnectd to a apted to move` into and out of engagement with said curved member, and adapted to be seated in said recessed `portion to holdl said shutter arm against pivotal movement.

2. In a device of the character described, a support, a shutter, a shutter arm connected thereto and having pivotal connection Dwith said support, said arm provided with a curved portion concentric with the axis of pivotal connection of said shutter arm and support, a trip pin connected to said support, said curved portion provided withy a shutter and having pivotal connection with n p said support, said shutter arm being' prol vided with a curved portion concentricI with the axis of pivotal connection of saidv shutter arm and support and provided with a 4 1 y l 1,142,1s

recess, spring means normally tending to armature, whereby to retract said trip pinV plvotally move said shutter arm, a trip pin and free said shutter arm romthe restraint slidably connected to said support, and proof said pin.

' vided at its 'rear end with an armature, In testimony that I claim the above, I 15 spring means tending tourge the front end have hereunto subscribed my name in the of said pin into engagement with said curved presence of two witnesses.

portion and into said recess, said pin, when FREDERICK R KLINK in' said recess, adapted `to prevent pivotal movement ofvsaid shutter arm' and an elec- Witnesses:

-. tro-magnet mounted upon said support and WILLIAM H. MILLER,

adapted, when energized', fto attract rsaid HAzEL OWEN.

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