US686045A - Curtain-shutter. - Google Patents

Description

BEST AVNLABLE COP:

No. 686,045. Patented Nov. 5, 1901.

W. F. FOLMER.

CURTAIN SHUTTER.

' Applicati on filed June 297 1901.

2 Sheets$heet I.

(No Model.

M m m w E Fl WITNESSES 5 BEST AVAzLABLE-COP No. 686,045. v Patented Nov. 5, I901.

. r W. F. .FOLMER. CURTAIN'SHUTTER.

(Application md June 29. 19cm 2 Sheets-Sheet 2.

A TTORNE YS r light on the subject.

then pointed out in the claims.

line 6 6 of Fig. 5.

BEST AVAILABLE cos;

UNITED STATES PATENT OFFICE.

lNlLLlAM F. FOLM ER, OF NEW YORK, N. Y.

CU RTAIN-SHUTTEFL.

'srncmcsrron forming part of Letters Patent Ito 686,045, dated November 5, 1901.

' Application and 1m 29,1001. scan in. seats. on model.)

To all whom it may concern.-

Be it known that 1, WILLIAM F. Fomma, a citizen of the United States, and a resident of the city of New York, borough of Manhattan,

5 in the county and State of New York, have invented new and useful Improvements in Curtain-Shutters, of which the following is a full, clear, and exact description.

The invention relates to photographic cam-- no eras;

and its" object is to provide a new and improved curtain-shutter adapted .to be set for time or instantaneous work and arranged to givea continuous or timewarying exposure of the plate, according to the intensity of the Thus for a land-andsky subject, for instance, the darker land foreground is longer subjected to the'actinic' action of the rays-of light than the sky por tion, and the whole exposure is continuous 20 and uniformly graduated in time to insure uniform or gradual exposure of the plate.

The invention also consistent novel fea tu res and parts and combinations of the same, as will be fully described hereinafter and A practical embodlmeutof my'invention is,

represented in the accompanying drawings, forming a part of thisspeciiication, in which similar characters of reference represent cor- 3o responding parts inall the figures.

transverse section of the im- Figure 1 is a provement on the line 1 1 of Fig. 2. Fig. 2 is a longitudinal sectional elevation of the same with the plate-holder frame in position.

5 Fig. 3 is a rear elevation of the same. Fig. i

is a front elevation of the same. enlarged face view illustrating the attachment of a curtain on .its roller. Fig. 6 is a sectional side elevation of the same on the Fig. 7 is a similar view of the same on the line 7 7 of Fig. '5. Fig. 8 is a plan view of the dash-pot. Fig. 9 is an enlarged sectional elevation of the lower-cur- Fig. 5 is an tain rollers and the pulleys for the cords, and 5 Fig. 10 is a face view of a modified form of the adjacentends of the main curtains.

The curtain-shutter is mounted in a suitably-constructed casing A, having an ope u-' ing A, adapted to be opened and closed (for go focusing or for making the exposure) y a main curtain consisting, essentially, of an pper curtain B and a lower curtain l5, hav g their. adjacent ends B B arranged such'a distanceapart as to form an exposure-opening B, through which the light passes from the lens to the plate during the time the curtains B and B move in an upward direction to move the said opening through the field of exposure. The size of the opening B can be increased or diminished, according to the subject under treat-- ment and as hereinafter more fully described, and the said opening B varies automatically in size during this movement through the field of exposure-that is, the opening increases gradually during the timeit traverses from the bottom of the casing the field of exposure from the bottom to the.

top, so that the upper portion of the field is more exposed'than the lower portion, whereby in the case,'for instance, of a laud aud-sky' subject the foreground, which appears on the top of the plate, is subjected longer to the action of the'actinicruys of light than the sky portion, which icon the. lower portion of the plate, and consequently a better picture will be the final result.

-The' upper curtain B winds on the springactuated roller 0, of any approved construc tion and having its shaft 0' journaled in suitable bearings in the sides of the casing A, and on one outer end of the shaft C is arranged a knob C, under the'control of the operator, increast? or decrease the tension of its spring, the shaft being normally locked in position bya spring-pressed,pawl C, engaging ashoulder 0 on the shaft, as is plaiulyindicsted in Figs. 1 and 4. ,The lower curtain B winds on and unwinds/from an ordinary roller D, attached at its-ends to shafts E E], mounted to turu'in suitable bearings in the sides of the casing A. (See Figs. 1 and 9.) A flexible connection connects the curtain B with the curtain B, so that when the curtain B' is wound up by the operator turning the-shaft E that the curtain is drawn along in a downward direction against the tension of the spring in its roller 0, andiwhen the exposure is to be made and the roller D is unlocked,

B and by this action draws the curtain B in an upward direction to unwind this curtain for turning the shaft C by hand .to

B from at roller D. The flexible connec- 35 hold the shaft E in an outermost position and BEST AVAILABLE con 'tion referred to consists,-essentially, of cords mounted on the shafts E and E, respectively.

Thepulle'ys G and G are provided with gearwheels G and G in mesh with gear-wheels G, secured on a shaft G journaled in suitable hearings in the sides of the casing 5., so that when the pulley G is rotated the other pulley G rotates positively with it. A knob .G is secured on the outer end of the shaft G to permit the operator to turn the shaft and gear-wheels G to rotate the gear-wheels G? and G and the cone-pulleys G G to wind up or unwind the cords F F whenever it is desired to increase or diminish the size of the opening Bbetweeu the ends of the curtains. The pulley G normally rotates with the shaft .Eund roller D, while the pulley G is mounted to rotate loosely on the shaft E.

The pulley 1; G :may bra-disconnected from the shaft E by .35-

the operator, and for this purpose a clutch is provided, consisting, essentially, of a clutch member G formed on the pulley G and adapted to be engaged by a clutch member G secured on the shaft E, the latter being movable longitudinally in its bearing in the casing A and in a'bearing D, formed in the roller D. (See Fig. 9.) A spring Eiscoiled on the shaft E within the roller D, its inner end resting on the bearing D and its outer end pressing against a pin E tonormally the clutch member G in mesh with the clutch shutter.

. memberTl.

\Vhen the shaft E is pressed inward against the tension of the spring E by the operator, then the clutch member G moves out of engagement with the clutch member Q", and the pulleys G G can now be turned independently of the roller D and the shafts E E by the operator turning the knob D, as previously explained.

A stop-collar E) is secured on the inner end .of the shaft E and is adapted to abutagainst the bearing Dto limit the outward movement of the. shaft E topr'event the clutch member G from creating undue friction when engaging the clutch member G, so that the shaft it and the parts connected therewith rotate freely to insure proper closing of the curtain- The roller D is rigidly secured on the shaft E, and a key E on the shaft E ongages a keyway on the corresponding end of the roller I), as is plainly shown in Fig. 9, so that the shaft 151s at all times connected with roller D whether the shaft is pressed inward, as previously explained, or extends in an outermost'position, as shown in Fig. 9.

In order to set the curtain-sluitter for instantaneous or time work, the following arrangement is provided: On the outer end of the shaft E is secured a knob 15'', adapted to be taken hold of by the operator for turning the shaft E and roller I), together with the assets pulleys G and G, to wind up the curtain B on the said roller D and to draw theeurtain lldownward in front of the opening A, as previously explained. A pinion E is secured on the shaft E adjacent to the knob E, and this pinion is in mesh with a gear-wheel H, mounted to rotate loosely on a stud ll, secured to one side of the casing A. The face of the gear-wheel H is formed with ratchetteeth H adapted to be engaged by the free end of a pawl I, mounted to swing on a stud I, carried by the side of the casingA. A

spring I presses the free end of the pawl I to hold the same in engagement with the ratchet-teeth I-P, the. said spring I being attached to a guide-pin 1', extending through an elongated slot 1 in the upper end of the pawl I. (See Fig.'4.) The extreme upper end 1 of the pawl I is adapted to engage either of the notches l or I in a spring-plate 1 secured to the side of the casing, as shown in Figs. 1 and 4. The lower or free end of the pawl I is also adapted to engage a timestop li and 3 limiting-stop H, formed on the .face of the gear-wheel II, inside of the teetlr H thereof. (See Fig. 4.) Now when the pawl I is in the position shown in Fig. land the end 1 of the pawl is in engagement with the notch 1, then the free end of the pawl en: gages the ratchet-teeth ll, so that when the operator turns the knob E to wind up the curtain B on the roller D then the pawl-I glides at its free end loosely over the teeth H of the ratchet-wheel II, and when the curtain is wound up the desired distance and the operator releases the knob'E then. the pawl I looks with the ratchet-teeth H and consequently locks the gear-wheel H, the pinion E", the shaft E, the roller D, and the pulleys G G against return movement. When the pawl I is now pushed outward out of engagement with the corresponding ratchettooth ll of the gearuvheel H, then the parts mentioned are unlocked and the curtainB flies upward, being pulled in this direction by the cord F, and the curtain B winds up on its roller C by the action of the spring thereof. In order to swing the pawl I outward, an inflatable bulb .I is employed, connected by a pipe J with a hand-b'ulb under the control of the operator, the said bulb J being interposed between the side of the casing and the rear face of the pawl I, as will be understood by reference to Figs. 1 and i. If desired, the

'pawl I may he swung out of engagement with the end 1 with the notch l and to bring the free end of'the pawl into the paths of the stops ll and ll. For the purpose mentioned the knob i is turned until the curtains are set (with the curtain ll wound up on roller U) and the stop ll is opposite the free end The operator now swings the pawl over-against the stop-pin H, and on releasing the pawl I by inflating the bulb J or working the lever K the curtains move upward by the action of the spring on the roller C until the free end of the pawl I abu'ts against the stop-pin H,

The opening B new I coincides with the opening A ',,and the exposure is made for such a length of time as is "desired,- and then the operator on releasingthebulb J or'leverK allows the pawl I to. swing inwardout of engagement with the 'stoppin H, and the curtains now move to Closed position.

, In order to govern the winding up of the curtain B and the unwinding of the curtain B when making the exposure, the following device is provided. On the outer end of the shaftpE' (see Figs. 1 and 3) is secured a pinionL, in mesh with 'a gear-wheel L, mounted 2 .to rotate loosely. on a stud L carried by the ,casiug A, and on the said gear-wheel L is secured or formed a diametrically--extending guideway L', engaged by a wrist-pin L, se-

[cured in place on the guideway byfn clamping-screw Li. The wrist-pin L ispiyotally i1 ,j"-"".onnect ed by a "pitman N with a piston N;

.p mounted to reciprocate. in a dash-pot cylin- L3 the'cutside 'ot the cylinder N Now by turning the sleeve N theslits N may be uncovbred-more or less, so asto admit more or less 4 'late the downward movement of the piston graduated ouits face, as shown in Fig. 3, to .permit ot" setting the cylinder N to govern der N,,'}attached to the casingtA, the said cylinder being provided in its-side with diffe'rent-sized slits N, gradually increasing in ,size'froin the top to the bottom, as isvplainly indicated in'F ig. 3, the said slits being adapted to register with a rectangular slit N formed in a sleev'e'N, mounted to turn on air to the upper end of the cylinder to regu N in=the said 'cylinder and governthe unwinding speed of the vroller D; The dashpot 'cylinder- N is' provided on'its top with an apertureN, gradually'decreasing in size, as is plainly indicated in dotted lines in Fig.

8,-and the said aperture registers withan aperture N formed in a cap N mounted to turn on the'uppor end of'the cylinder N. Now by turning the cap N the aperture N connects with awideror narrower portion of the aperture N, so that more or less air is admitted to the cylinder to control the move- 1 mentof the piston therein.

The gear .\vlieel L previously mentioned is the unwinding speed of the'roller D. By adjusting the wrist-pin L in the diametrical guideway L? the throwot the'pistou N in the cylinder N is regulated, it being understood that after the adjustment of the wrist-pin the latterissecured in place by the screw L.

. The gearing L L is so proportioned that the wrist-pin does not make more than one-half a turn for the entire closing travel of thecur- BESTAVNMELE oohof the pawl I, engagiuga ratchet-tooth H on i the wheel H.

'winds up the safety-curtain.

In order to cover the opening 13 during'the' time the said opening'is moved downward through the field of xposure, a safety-curtain O is provided, winding on a spring-actuated roller 0, journaled in the upper portion by a corresponding lip 13, formed on the end 33 of the curtain B, so that when the curtain B is in'an uppermost position and the 6perator turns the knob E to wind up the e-urtain B on the roller D, then the said lip. B

engages the lip 0 and thereby moves the safety-curtain 0 down with the curtain B,

the safety-curtain then unwinding from its spring-actuated roller 0'. It is understood that normally the end 0' of the safety-curthe end B is above the end 0 at the time the curtain B isunwoiind nndthe curtain D is wound up on its roller, and hence when the knobE is turned,as previously explained,

tain .0 abu'ts against the crossbar A", so that the lip B engages the lip 05 for the'purposo mentioned.

On the end Oof the safety-curtain O are formed pins 0, adapted to engage the ,inclined ends R of spring-arms R, secured to the inside of the casing, in the lower porti'on thereof, the said spring-ar|ns R having elongated slots R,-adapted to be engaged by thesaid pins O'atthe time thecurtain moves into, alowermost position and the safety-curloo min O'has been drawn clear across the opening A. It is understood that when the curtain'B is wound up andthe curtain O-moves down with it then the pins Offinally move into engagement with the inclined ends R of the spring-arms R, so as to press the latter apart until the pins 0 finally-snap into the openings It, thus locking the curtain O'in an extended position.- On further winding up the curtain B the ii 13 oils on the li 0 P P p but as the pins 0 now engage the apertures R it is evident that the end 0 turns with the said pins astrunnions and the lip Bifiually moves out of engagement with the lip o On the further winding up of thetcurtain B on the roller D and the drawing of the curtain B downward in the rear of the'safetycurtain O the projecting ends of the crossbar'forming the end B of the curtain B .finally move in engagement with the inclined ends of the arms B, so th the latter are pressed outward and finally move out of engagement with the pins 0, so that the safetycurtain is automatically released and immediately ilies upward owing to the action of the spring in the roller 0, which latter now This releasing of the safety-curtain takes place at the time 4 curtain O is automatically released and flies BEST AVAILABLE GOP" &

' 3 the end B has well passed the lower end of the opening A, so that there is no danger.

whatever of'li'ght passing through the opening A. From the foregoing it is evident that the safcty-curtainO is actuated when setting the curtains B and B.

In order to insure asecure fastening of the curtains l3 and B and their rollers- C and D, I provide the arrangement'shown in Figs. 5, 6, and 7-thatis, the roller-end of each curtain is formed with eyes produced by lips B and B bent in opposite directions and cemented or otherwise secured to'the rollers C and D, so that in winding up and unwinding a pull is always exerted against either of theeyes B or B to prevent the same frombecoming loose on the rollers.

The ends 13 B of the curtains B B are preferably curved, as indicated in Fig. 10, to

make the opening B smaller at the middle than at the sides to admit more light to the Y sides of the sensitive plate than at thesniddle thereof. This is doneto equali ze rt'lie' power ofthe lens, which is more intense atihecem ter of the field than at the sides thereof. The operation is as follows: When the'casing A is placed .in position on the rear end of the camera and in front of the plate-holder and it is desired to set the shutter for instan taneous work, then theioper'ator' moves the pawl I into the position shown -in' Fig. 4 and then turns the knob E, so .a'sto wind up the curtain B on the roller D and to unwind the curtain B from its spring-actuated roller 0.

During this movement of. the curtains l3 and B the safety-curtain O is drawn along, as previously explained,jand when the curtain B has been completely wound up on its roller D and the curtain B'has beenextended-compietely over-the opening A then the safety-4 back to its normal position withthe curtains B and B locked in place by the pawl I engaging a'ratchet-tooth H .on the gear-wheel H. .-Now when it is desired to make the exposure the operator either inflates the bulb J or presses-thehand-lever K to move the pawl Ioutof engagement with the ratchet-tooth H, so that the roller D is free to rotate, and with it the friction-rollers G G, to permit the curtains B and "B to move upward, the curtain B being wound up by its spring-actuated -roller 0. During this upward movement of the curtains B and Bthe cords F'aud F unwind from .their cone-pulleys G G at a diflerential rate of speed from that ofthe curtain B, so that the opening B increases in size during the upward travel of the opening Y through the field of exposure. It is.nndersto d that at the beginning of the unwinding '0! the curtain B the cords F F are at the smallest diameters of their pulleys G G, and as the unwinding takes place toward the large diameters of the pulleys it is evident that more is unrceled in proportion to the unwinding of the curtain 1-3, so that the upper curtain B gradually winds up faster than seems pears at the bottom of the plate, at the'ti'me I the opening B is smallest. The dash-pot mechanism-graduates the winding up of the curtain B and the unwinding of the curtain B", and as the piston N is p itively connected with the shaft E and oller D, as previously explained, it will be understood that more or less air can be admitted to the upper end of the cylinder, so that the downward movement or the piston N is faster or slower, according to the ambunt of air admitted.

From the foregoing it will be understood that when the exposure is made more time is given to the ioregroundof the subject than Jae he sky; but as this action is gradual no demarcation line will be produced-on the plate, as would be the case if the opening; are i scribed the curtains I B may be moved so far apart as to allow full focusing, or the opening B may be-diminished to leave but a narrow slit between the ends of thocurtaius to allow of using the shutter for very high speed work.

By the use of the dash-pot controller the time of the exposure is graduated frorn'one part of the plate to the other;

Having thus described my inven tion, I claim as new and desire to secure by Letters Patent 1. A curtain shutter having an exposure: opening adapted to be gradually increased in size while moving over the field of exposure, as set forth.

2. A curtain-shutter having an exposure opening adapted to be gradually increased in size while moving over the field of exposure in the direction from the bottom of the. field to the top thereof, as set forth;

3. A'curtain-shutter having a plurality of curtains movingatadiiferential rateofspeed, with the adjacent ends spaced apart, as set forth. v 4. A curtain-shutter having a plurality of curtains forming an exposure-opening between adjacent ends, and means for moving the curtains at a differential rate of speed to vary the size of: the opening while traversing the field of exposure, as set forth.

5. A curtain-shutter having a plurality of curtains forming an exposure-opening between adjacent ends, the said opening being adapted to be gradually increased in size while moving over the field of exposure-and ICU one of the curtains being adjustable relative a taoh'cdat one end to the unwinding curtain 5 means comprising flexible connections at- 60 and extending loosely through the other car- BEsrA 6, A'curtain-shutter having a plurality of curtains forming an exposure-opening between adjacent ends, the said opening being adapte'dito'be gradually increased in size 5 while moving over the iield of exposure, winding-up' meansffor one of the'curtains, and

means for connectingthe curtains witheach other to unwind one curtain while winding up the other one, as set forth 1o 7. A curtain-shutter having'a plurality 'of wcurtainsforming an exposure-opening betweenadjacent ends, winding-up meansv for one of the curtains, and meansfiorconnecting thecnrtains with ,each other to unwind one :5 curtain while'winding up the other one, the said oonnectingmeans beiugarrauged to wind upthe' first curtain ata diiferential speed from that of the unwinding one,jas set forth; 8. A curtain-shutter having a plurality of so curtains'f orining'an'exposureopen ng between adjacent ends, winding-up lllGflllQfiJf one oE-thecurtjains, and meanslfogconn'e ctin g the curtains with each other; tounwind one curtain while winding up the other one, the :5 se'rd connecting means beingarranged to wind nr'gthe firstcurtainguicker than the othercu'rtain is unwoundga s set forth. 5

9; A curtain-shutter having a plurality of curtains forming ,an exposure-opening be-' 39;"78611 adjacent ends, winding-up means for; one of the curtains, meansfor'connecting the 1 curtains with each other to unwind one cur; this while winding up the other" one, the said means comprising flexible connections atand extending loosel y through the other cur-. tain, and cone-pulleys on which wind the said flexible connections, as set forth.-

10. A curtain-shutter havinga plurality of 40 curtains formingan exposure-opening .be-

tween adjacent ends, winding-up means for one of the curtains, means for connecting the curtains with each other to unwind one cur-, tain while winding up the other one, the said,

tached at one end to the unwinding curtain and extending loosely through the other ourtain, and cone-pulleys on which wind the said'tlexibie connections, the said cone-pul- 5o leys turning with the roller of the unwinding curtain, as set forth. 1

11, A curtain-shutter having a plurality of curtains forming an exposure-opening between adjacent ends, windingup means for one of the curtains, means for connecting the curtains with each other to unwind one ourtain whilewinding up the other one, the'said means comprising flexible connections attached at one end to the unwinding curtain tain, concpulleys on which wind the said flexible connections, and means for setting the winding-up curtaiii relative to theot-her curtain, as set forth.

12. A curtainshuttcrhaving a plurality of adapted to be gradually increased in size while moving over thefield of exposure, a

a roller for-the lowerourtain, and a variable connection between the adjacent ends of the curtains, as set forth.

13. A curtain-shutter having a plurality of curtains forming an exposure-opening between adjacent ends, a spring-actuated roller for theupper curtain, a roller for the lower curtain, a flexiblejconnection attached stone, end to the free end of the ion er curtain and xtending loosely through'the free end of the "upper curtain, and conc-pulleys mounted to turn with the roller for the lower curtain, as set forth.

14. A curtain-shutter having a pluralityoi. curtains forming an exposure-opening between adjacent ends, a spring-actuated roller th the -upper curtain,-a roller: for the lower curtain, a flexible connection attached atone end to the freeend of the lower curtain and extending loosely through thefree efidot the -;upper curtain, cone-pulleys mounted to turn with the roller for the lower curtain, and manuallycontrolled means for connecting and disconnecting the cone-pulleys from the lower roller, as set forth.

curtain provided with a roller, a. connection between'the curtains, to wind up the upper curtain faster than the lower curtain nnwinds,

ate the winding up of the upper curtain and the unwinding of the lower curtain, as set forth;

16. A curtain-shutterhaving an upper curtain provided with aspring-rolier, a lower curtain provided with a roller, a connection between the curtains, to wind up the upper curtain faster than the Iowercurtain unwinds, and a dash-pot for the lower roller, to graduate the winding up of the upper curtain and the unwinding oi the lower on rtain, the dashpot,having a variable inlet, as set forth.

' 17. Acurtain-shutterhavingan uppercurtain provided with a spring-roller, a lower curtain provided with a roller, a connection between the curtains, to wind up the upper curtain faster than. the lower curtain unwinds, a dash-pot for the lower roller to graduate the windingup of the upper curtain and the unwinding of the lower curtain, and a variable connection between the dash-pot and the said lower roller, as set forth.

p 18. A curtain-shutterhavingashutter-curtain provided with an exposuge opening adapted to be gradually increased in size while moving over the field of exposure and a dash-pot for controlling the speed of the shutter-curtain, as set forth.

1.). Acurtain-shutterhavingashutter-curtain provided with an exposure opening adapted to be gradually increased in size while moving over the field of exposure and curtains forming an exposure-opening bet een adjacent ends, the said opening being a dash-pot for controlling the speed of the spring-actuated roiler'for theupper curtain,

15. Acurtain-shntterhaving an upperenrtain provided with a spring-roller,'a lower and a dash pot for the lower roller, to gradu- 25 "released as soon: asethe shntt to move the sa fefy eurmin" intoa-n es en'ae ST AV BLE 6 ACQPY shutter-curtain, the dash-pot having a. variable inletto vary the speed, as set forth.

- 20; A camera-shutter having a dash-pot for controllingth'e speed of the shutter, and comprising acylinderhavingsli ts in its side wall,

a piston in saidcylinder and connected with the shutter-curtain, and aeut-ofi sleeve having a. slit and movable on the said cylinder to regulate the inlet-of nines set forth.

to BL 'A earnel zyshiitter'having a dash-pot,

comprising a cylindei-providetl with a gcadually-tapering slot-in its head, apistonin the said cylinder and conneeted-with the s'hnttercurtain, and a. regnlating-capmovable on the w :5, sa d cylinder and hnvingnn open ng iregistering with the. said slot, as set forth.

22. A curtain-shutterhaving-a safety-chm tain automatically picked npfwhile setting the shutter emi -automatically 'rclessed ms soon asthe shutter is-set. v

.23; A cuvtain-shntten h tvin g a:niniincni tain and a safetyicurtain adapted-to benntoinatically picked up bythe, main cui' tnin" while'settingthe shutten nnd automatic'ailj I means on fliesaid curtain n l-engaging the said safety-curtain bylhe aid-main .cui tai c v n position omsetung' the mnrn. ul'tain, asset forth. '3

} 25.'A cu'i'tnimshuticr hay111g mnin cm '1 aim-it Spl'ing;a C.i,U:ti,8dS&fY-.C main, means on the snidTcm-tains'for.engaging the said safety-curtain lry the snid nmin curtain. to

move the'snfetyeurtain into an'ex'tended sitionwhen setting theu-nmih' cni-tnin and xneans tor zintomstically reieasin g the safety enrtaimas soon as the main curtain is set, substantially as described.

and adapted to -be engaged by-the said en- 'gaging-idevicm'end a spring for pressingthe safety-curteimas set foi-th. V

- 28; A curtain-shutter having a main cur- :ed to' be moved into a closed positionbytho satiety-eni-tniin'nd means on the said main said safety-curtain, as set forth.

".nmnetdthis spceilicntionin the presence of two sn scribing witnesses.

'lv tncsses Y EYERARD l3. MARSHALH;

'26. A curtain-shutter having it mein cnrtain, a spring-actuated safety-curtain, a con- 's'aid-safety-enrtain, to'bring theengaging dee o I 0 ,viee into positive engagement with the-said I tain provided with s spring-actuated roller',-

6 i tain, a springfictuated safety-curtninadaptsaid nnin cui tain, spring-items havingopenf ,ings -for engagement-by pins on the said. 4

cu rtni'n and adapted to engage the'snid springarms to release the said pins and thereby the In testimony whereof I have signed my 1 itLiAM nominal V

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