US929742A

US929742A - Mechanism for operating rolling metallic shutters.

Info

Publication number: US929742A
Application number: US43966208A
Authority: US
Inventors: Lester G Wilson
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-06-22
Filing date: 1908-06-22
Publication date: 1909-08-03
Anticipated expiration: 1926-08-03

Description

L. G. WILSON.

MEGHANISM FOE OPERATING ROLLING METALLIC SHUTTBRS.

APPLICATION FILED JUNE 22, 190B.

Patented Aug. 3, 1909.

2 SHEETS-SHEET 1.

- wmyEssEs: A? W ATTORNEYS L. G. WILSON. MECHANISM FOR OPERATING ROLLING METALLIC SHUTTERS.

APPLICATION FILED JUNE 22, 1908.

929,742. Patented Aug. 3. 1909.

2 SHEETSSEBIJT 2,

INVENTOR 1.155756 G. W/L50/v.

WITNESSES:

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ATTORNEYS LESTER G. WILSON, OF LARCHMONT, NEW YORK.

MEGHANISM FOR OPERATING ROLLING METALLIO'BHUTTERS.

' Specification of Letters Patent.

Patented Aug. '3, 1909.

Application filed'J'une 22, 1908. Serial No. 439,882.

the means employed for raisingand lowering the large corrugated metal or interlocking slat shutters now so generally used to protect the doors and windows of large buildings at night, and when not in regular use, and is especially useful when the shaft u on which such shutter is rolled or unrolle is placed below instead of above in which case the shutter-must be drawn up to close and let down to open.

The object of my invention isto arrange a shutter of the above described type Which may be readily opened or closed, and which may be stopped at any desired point; which will require a minimumof effort to operate it, when the proper means is employed, but which is positively locked and cannot be moved howevergreat the force otherwise applied; in which the shutter is always tightly stretched; and in which the operating mechanism, is simple, substantial, and not easily deranged.

My invention will be best understood by reference to the drawings Where- Figure 1 is an elevation looking from the rear, or inside, of a metal shutter fitted with my improved operating mechanism. Fig.2 is a sectional elevation along the line (Ir-'1) of Fig.'1- and Fig. 3 is a plan, part in section,' along the line cd through the: axis of the shutter roller, the view being taken from above, and the shutter itself being omitted.

1 is ashutter of corrugated iron or steel fixedlyattache'd to

barrels

2, 2, 2, and adapted to open and close awindow opening 3; the edge or end of the curtain is providedwith a bar, 4, operating to make a close mechanical joint with the to of the=wi-ndow frame when the shutter is cosed, as also to stiffen and protect the end of the shutter.

. Attached to the window ire-meat one side. is :a worm gear, 5, composed of a worm, -6,

engaging a wheel, 7, WhlCl'l is carried by the shaft, -8,-bearing at its other extremitya s rocket wheel, At the top of the-winow frame is mounted a shaft, 10,- carry-in sprocket wheels lland 12, fixedly-attache to each end; these Wheels lie in planes intersecting that ofthe curtain near the outer edges of the runways, 13 and 14-, in which the curtain moves and one of these planes, that of sprocket wheel 12, is also that of the worm gear sprocket wheel, 9. The peripheries of these sprocket wheels project into the runways approximately to their central plane. Shaft 10 itself is hollow and has, at one end, a journal 12 fixedly attached thereto and working in asuitable journal box setin the side of th shutter frame or opening. At the other end of the hollow shaft is a suitably formed-plug 11 also fixedly attached; thisplug has the sprocket wheel 11 exteriorly V eyed to it and is centrally bored to receive a short shaft section 11 itself firmly keyed to a wall socket 11 by a pin 12 upon which shaft section it is free to rotate. A coiled spring 1 1 of selected strength is fixed,at one end to the shaft section 11 and, at the other end, to an internal plug 12 'riveted or keyed straight down tobe fixedly attached to the periphery of a-fla-n edpulley, 17, keyed-to one end of the barre shaft, 18, and the other 16 being similarly-attached to a second flan ed.pu1ley,"19, identical with 17and simi arly fastened to the shaft, 18', the chain first passing back, however, over the worm gearsprocket, 9, and engaging therewith.

The shutter roller consists ofa shaft 18, which is attached to the window frameby suitable bearings, 20, 20, and besides carr v-. ing the pulleys, 17, and 19, also supports the

barrels

2, 2, 2, to'which the inner shutter end is fastened and upon: and from which the shutter is rolled. These rollers may be thought of as relatively thin flat disks with a centraL-hub 2 on one side and a flatenipheral rim 2*- on the other, the hub belng bored for-an easy fit over shaft 10 and the other diameter of the rim'being gradually decreasedover a segment of its circumfer ence un til it meets a radial :and axial shoulder, 21, .a ainst which the curtain end is abutted; t 's construction causes the rolling and :un-ro'lling of the curtain upon its barrels I riability in the necessary applied power which would Otherwise result. Collars, 22, 22, retain the rollers in their correct axial position. Inclosed within the rim of each rollerand attached to it at 23 is a spiral spring, 24, preferably of flat material, so selected as to have a suitable number of turns and tension; the inn'er'end of this spring is attached to shaft 18 at 25. The

barrels

2, 2, 2, may, therefore, turn in either direction upon shaft 18 against the resistance of spring 24, within limits detgrmined by the length of the spring, its tension, and the torsional force applied. Suppose, now, the curtain to be down or open. To raise it I rotate the hand wheel, 26, carried by the worm gear shaft, 8

in the proper direction, thereby pulling u on the curtain end throughthe instrumenta 'ty of the sprocket chains and causing the curtain to unwindfrom the

barrels

2, 2, 2; the shaft 18, through the springs, 24, will also rotate tending thereby to wind upon the pulleys 17,. 19, that length of sprocket chain which is released by the unwinding of the curtain.

The shutter 1 is, necessarily, of considerable thickness so that the diameter and consequent circumference of'the cylinder which is formed as it rolls'and unrolls, changes very rapidly and has minimum and maximum limits widely difierent. When the curtain begins to rise this circumference is greatest but continuously decreases as the curtain is unrolled until, finally, when-the latter is fully closed, it becomes least. The effect of this is, that for successive revolutions of the shutter barrels the length of the shutter unrolled and, hence the length of sprocket chain to be wound uponthepulleys, 17, 19, becomes less and less. But since the sprocket chain itself has material thickness it must, as it winds upon these pulleys, steadily increase the effective diameter of the cylinder uponwhich it, itself, rolls. An actually greater length of chain is therefore required for each succes sive revolution of the pulleys. By using the previously described spring connection between the

rollers

2, 2, 2, and the shaft v18,

' these just mentioned opposing conditions are reconciled inasmuch as this shaft need not revolve with the same angular velocity as the rollers, but is free to turn relatively thereto,

' while tending continually to rotate, there fore, in the same direction as the roller it will, in fact, only rotate sufficiently in amount to hold the chain and shutter taut.

The relative rotative movement of the pulleys and the barrels may be continuously in the one direction or the other, as the shutter rolls or unrolls, or part1 in the one direction and partly in the ot er; this depends largely upon the diameter of the pulleys with reference to the diameter of the rolled shutter. If the pulley diameter is less than that of the fully rolled shutter the pulleys will,

rotate more rapidly than the rollers until such time as the decreasing diameter of the rolled shutter shall become equal to the increasing diameter of the chain wound pulleys after which the pulleys will revolve less ra idly than the curtain rollers. I pu leys be of greater diameter than the fully Should the rolled shutter they will, of course, revolve the coiled shutter whenthe latter is about half'unwound and with some tension on the rings, 24, at this point. In this way, as the s sliutter begins to unroll, the pulleys move relatively to the shaft so as to lessen the spring tension to a minimum when the shutter reaches its midway position, after which the relative directionof movement is reversed so as to restore the spring tension to a maximum as the shutter is furtherunrolled to its limit. It should be noted that the

bar extensions

15, 15, to which the

chains

16, 16 are attached are well below the to of the bar; this is so that the top flat of the ar may be firmly seated against the underside of the top of the shutter opening before the attaching points of the chain and bar begin to'turn over the to of the sprocket wheels and out of the vertlcal plane of the curtain. As explained, there is always tension upon the springs 24, so that, no matter in what position, their tendency is at all times, to coil the shutter upon the barrels. This keeps the shutter front. stretched and smooth and so as to always present a good appearment upon the shutter barrels, tending always to coil the shutter, must be established and is aided by the s ring 11* of the top shaft 10 which I set so that it has, always, a tendency to. raise the shutter. This setting 1s easily accom lished by thrusting a pin into diametral ho cs 13 and using this pin as a lever to rotate the shaft 11 joined to the end of the spring, the key pin 12 being adapted to fit any one of a number of similar diametral holes placed in the shaft for its reception. The direction of rotation is so chosen that s ring 11 has minimum tension when the s utter s up or fully closed but is increased as the shutter is lowered.

By employing a' properly proportioned worm gear as an operative means, the shutter may be raised or lowered with ease no matter how large or massive it may be; being an irreversible device, however, the shutter can not be operated by my force, however, great, applied elsewhere or from the outside.

rmaintained. This stretching of the shutter fore, for light or ventilation without fear of casual trespassers since it may not be moved from the outside and does not afford an easy footing for climbers.

I may, if I choose, substitute for the upper spring shaft 10 as described, an ordinary straight shaft with sprocket wheels firmly fixed thereto and Imay also vary many of the details of design and construction in my invention without departing from its true spirit, and now, having described its pre-' ferred embodiment,

I claim:

1. In a flexible metallic shutter having one end attached to and adapted to coil upon a roller; journals within said roller and elastically attached thereto; and means attached to the journals and to the free end of the shutter and cooperating with an irreversible driving device whereby the shutter may be operated.

2. In a flexible metallic shutter havingone end attached to and adapted to oil upon a roller; journals within said rolle and elastically attached thereto; means guided by overhead pulleys and attached to said journals and t e free end of said shutter; and an irreversible driving device cooperating with said means and adapted to operate the shutter.

3. In a flexible metallic shutter having one end attached to barrels and adapted to coil thereon, a shaft assing through the center of each barrel am elastically attached thereto; pulleys fixedly attached to the ends of said shaft; sprocket chains cooperating with overhead sprocket wheels and attached, as

, to one end, to theeriphery of each pulley the other ends 0 sa1d chains being attached to, the free end of the shutter; and

an irreversible driving device engaging one of said sprocket chains and adapted to oper- I ate the curtain.

4. In a flexible metallic shutter having one end attached to barrels and adapted to coil thereon, a shaft assing'through the center of each barrel and elastically attached thereto; flanged pulleys fixedly attached to the ends of said shaft; s rocket chains cooperating with overhead wheels and attached, as 'to one end, to the periphery of each pulley the other ends of said chains being attached to the free end of the shutter; and a sprocket wheel driven by a worm gear enga ing one of said sprocket chains, whereby sai curtain may be raised or lowered.

5. In a flexible metallic shutter having one end attached to barrels and adapted to coil thereon, a shaft through the center of each barrel and elasticallyl. attached thereto;

'flanged pulleys fixedly attached to the ends of said shaft; overhead s rocket wheels fixedly related to one anot er and having torsional s ring connection with fixed centers upon whic they rotate; sprocket chains cooperating with said overhead sprocket wheels and attached, as to one end, to the peri hery of each pulley the other ends of said c ll'ains. being attached to the free end of the shutter; and a sprocket wheel driven by a worm gear engaging one of said sprocket chains, whereby said curtain may be raised or lowered.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LESTER G. WILSON.

Witnesses: ELMER SHIRLYOUNG, JOHN A. KEHLENBEGK.