US1054993A - Screen. - Google Patents

Description

L. SIMON.

SCREEN.

, AIPLIOATION FILED 11.12.12, 1911.

Patented Mar. 4, 1913.

3 SHEETS-SHEET 1- INVENTOR mamas WIT E8858 a sums-sum 2.

INVENTOR ATTORNEYS Patented Mar. 4, 1913.

L. SIMON.

scum APPLIOATION FILED MAR. 18, 1911.

- WITINESSES L. SIMON.

t SCREEN. APPLICATION FILED MAR. 18, 1911.

s sums-sum a.

Patented Mar. 4,

INVENTOR ATTORNEYS UNITED STATES PATENT OFFICE- I .LEOPOLD smon, on NEW roan, N. Y.

- scam-1N.

Specification of Letters Patent.

' Application aieuiafchis, 1911. Serial 110415.200.

To all whom it may concern Be it known that I, LEOPOLD Sti ton, a

citizen of the United States, residing-at New to adjustable screens adapted to be used as awnings.

One of the objects of the resent invention is to provide a practical, e cient and easily operated device of the above character.

Another object is to provide a screen which will be simple and compact in construction.

Another object is't-o provide simple and practical adjusting means therefor.

Another object is to the kind described which will have few parts and will be cheap to manufacture.

A further object is to provide amimproved device of the above character adapted to shut out the direct light, yet permit the admission of reflected light and fresh air.

Another object is to provide .an eflicient alarm device.

Other objects will bein part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction'hereinafter set forth, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, wherein are shown severalvario'us possible embodiments of the-present invention, Figure l is an elevational view of one form of screen as applied to a window, with certain parts broken away for the sake of clearness; Fig.

2 is an end View of; the. device shown in Fig.

1; Fig. 3 is a transverse sectional view taken on the line X-X of Fig. 1; Fig. 4 is a plan 1 view of the device shown in Fig. 1, showing section; Fig'. 5 is a SGCtlOIlfll a portion in Y-Y of- Fig. 1', with view taken .on the line the screen member's set at a different angle. Fig. 6 is an enlarged end view wit-h certain parts in section, and omitted for clearness. Fig. 7 is an enlarged detail sectional view;

rovide a device of Fig. 8 is a diagrammatic view showing the manner in which the screen members are raised; Fig. 9 is a'modification; and Fig. 10

- is another modification showing diagrammatically the screen member applied to a curved window.

similarreference characters refer to similar parts throughout the several views of the drawings.

- Referring now to the drawings, particularly Fig. 1, 1 represents the window frame,

to the corners of which are secured upper brackets 2 and lower brackets 3. Extending intermediate these brackets vertically are;

square guiding and supporting members or rods 4 having cylindrical bearing ends 5, provided with ball-bearings if desired as shown in Fig. 6, whereby the same may turn freely on their supports. At the upper part of each of the rods 4 is a curved member 6 supported by a pin 7 (see Fig. 6), to which is secured a clamp, arm, or frame member 8. At the lower part of the rod 4 may be positioned a similarly curved'member 9 carrying a lower clamp, arm or frame member 11 and which, as will hereinafter appear,

may be held in different positions longi tudinally of the guides t by pins'lO, adapted to enter any of openings 10 in said guides. The lower arms 11 have rectangular openings engaging'the rods 4 permitting movement of the arms longitudinally of the guides but preventing said arms and guides from rotating relatively to each other. The upper and lower clamping members 8 and 11,support a strip of flexible screening material, such'as canvas or the like, 12, which is secured to each by a metal clamp strip 13 riveted or screwed in place as indicated in Fig. 7, These frame members at opposite sides of the screen are connected in the first modification herein shown by links comprising longitudinal angle bars 14 pivotally secured to the opposite ends of each of the above described and spaced equal distances apart are a plurality of similar supports Patented Mar. 4, 1913.

, ing

thereby forming a row or series of screen longitudinal movement on said rods but caused to rotate therewith; Thus each guide rod is provided with pairs of oppositely extending arms movable toward and from each other,and' the link connections between similarly disposed arms of each pair form pairs of upper and lower links, the links of each pair moving in opposite directions as the rods i are rotated. 'Preferably certain of the frame members 8 and ,11 of each series are so located as to contact the guide rods at the extreme limit of their rotary, or angular, movement, so as to, prevent the screen members from completely closing on each other, and hence space is left for the passage of air between the screen members when in theirextreme angular position. On each of the end brackets 2, and supported also by the guide rods 4, is a bearing member 15 adapted to support a transverse rotatable winding drum or bar 16. Suitable ball-bearings such as indicated by the dotted lines 17, Fig. 7, may be applied thereto if so desired. At substantially equal intervals along this transverse drum or bar 16 are attached cords 18 which are secured to the lower frame members or supports 11 by eyes 19 or other suitable means (see Fig. 5). Wound about the ends of the bar 16 are cords 20 to which are attached. weights 21. When the screen members are not held in lower position by the pins-l0, the weights and cords descend thus automatically rotating the drum 16 and winding the cords 18 thereon, and as said cords are attached to the lower frame members the latter will be elevated, thus raising the members by reducing their effective vertical extent. Any desired vertical length of screen members may be secured by means of the pins 10, which may be inserted in any one of the openings 10' arranged at different heights along the guide rods 4.

The screening or awning material 12 of each screen member is folded upon itself in a zig-zag manner, as shown in Fig. 8, when the screen is raised, being guided and held in position by rings 22 surrounding the cords 18. One cord to each screen member is usually sufficient, although three may be used if so desired, as shown in Fig. 7, that is, one intermediate cord member and two outer cords 23, passing over suitable pulleys 24 positioned in the angle iron or longitudi- 11' have rectangular openings en- H gaging the rods 4, so, as to be capable of nal members 14. The pulleys are supported to rotate in bearings 24? so that as the screens rotate, the pulleys may retain alinement with the cords. Preferably the outer cords are disposed adjacent the edges of the screens, so as to support the screens, pre

venting undue bulging under the influence of the wind.

' Suitable means such as shown in Figs. 1 and 6 are preferably connected to the end screen members, to which the others are connected, forholding the same in adjusted position in windy weather. A simple and convenient form of mechanism comprises a wheel 25 having depressions or teeth on the periphery thereof formed'integrally with or mounted upon the rod 4 and adaptedto be engaged bya sliding bolt member 26 mounted uponthelower bracket 3 having one end adapted to engage the depressions of the wheel in a well known manner to prevent a rotation thereof.

The upper part of the screen is preferably inclosed within a hood or cover 27 as shown in Fig. 2, in order to protect the mechanism as much as possible from the rain and snow. If desired, this hood may be provided with an opening 28 to display a sign or advertising matter mounted on a translucent backing, which may be illuminated at night by an electric light 29 having its rays re flected on the back of the sign by means of a mirror 30.. The hood may be constructed of any suitable material but is preferably made of frosted glass or the like. By providing the screen with a source of electric energy, for example a battery, suitable wiring and a hell or other means for sounding an alarm, a burglar alarm may be provided as shown in dotted lines in Fig. 1.

In the burglar alarm construction shown, thecords 18 of the screen are composed of material adapted to conduct an electrical current, consisting preferably of copper wire suitably insulated and protected by an outer steel casing. These cords may be attached to'the rotatable bar 16 in any suitable manner, for example, by the plugs 31,

which in this case are insulated. In order that the cords for each screen member may be in electrical circuit with each other suitableconnecting cords 32 extend from the upper and lower ends of the adjacent cords.

A modification of this connection of the various cords of the screen members (shown in Fig. 4) is provided by passing a continuous cord through a seriesof apertures 33 in the rotatable bar 16. The cord will pass from one of these apertures through holes in the upper and lower frame bars of the screen -member, thence to the lower frame bar of the adjacent screen member, thence through the upper frame bar-of this latter screen member to the next aperture in the rotatable bar,

and so on through all the connected to each other.

v gitudinal members 14, as shown in Fig. 4,

y means of the set of single contact plates 34 attached to either end of one of said members, and the set of contact plates 35, and 36 attached to'either end of the other .of

said members. According to this construction, when the longitudinal member having the set of double contact plates is moved to the rightfcontact plate 35 will contact with the single contact plate 34 and when the member is moved to the left, contact plate 36 will contact therewith.

A'battery 37 connected in vseries'in the circuit is connected to the contact plates 35 1 and 36 at one end of the longitudinal member by a line-38. These contact plates are insulated from thelon 'tudinal member to which they areattache and are electrically The current flows from either one or the other of said contact plates, according to the position of the longitudinal member to which they are attached, through the contact plate 34, thence by the line 39 through the cords 18 and connecting cords 32, the cords, as shown,- being connected in series. After leaving the last cord in the series thecu-rrent travels throu h the line 40 and traverses the field, of t e electro-magnet 41. From there it flows to the switch 42and thence returns to the battery by the line 43. Connected in parallel with the battery is a bell or alarm circuit which includes a line- 44 leading from the battery to a bell 45,'and from there to a stationary contact member 46. According to the construction outlined, a slight current controlled by the resistance of the circuit continually passes through the screen circuit, energizing the elect-ro magnet, which thereby holds the switch in normal position out .of contact with the contact member in members having been thereby brought to-' gether, the screen members are locked in their closed position, as usual, by the bolt 26,.

The cords in the embodiment shown are sufficiently close together to prevent the'body of a man passing therebetween, even if -the canvaso-r other screening material were re-.

moved. To effect an entrance it might therefore be necessary tocut one or more of the cords. Ifthisbe done the switch 42,-

which, as noted, is normally held out of contact with the member46 by the electromagnet, will drop into contact with' this member, thus completing the bell circuit.

The current will then travel from the battery throughthe line 44, through the bell,

through the member 46, through the switch 42 and return to the battery by the line 43.

The alarm will be in this way sounded. If,

on the other hand, the burglar were aware of the bolt preventin the screen from openi-ng he might slip is hand between the screen membersand-withdraw the bolt. If this were done, however, and the screen {members opened only slightly, contact f'would be broken between the contact plates .on the upper longitudinal members, which, 3 as noted, are in series with the electro-magnet, the switch would drop as before and ;the bell circuit again com leted, whereby i the-alarm would be sounded:

In the modification shown in.Fig. 9 sub- 'gstantially the same form of screen is used Qas that illustrated in the other figures, ex-

cept that the upper bracket is in the form of la hinge 48, (see 9), whereby. thescreen .lower part of. the screen is preferably pro-- {vided with a roller member 49 adapted to ftraverse a curved rod acting as a track 50 idet-achably connected to a bracket-51 secured l to the side of the building. When the screen i is-swung in against the building], the arm 50 mav be detached. If desired t is arm may be hinged so that when the'screen is swung ;in, the arm will lie flat against the side of the building. a The screen may be held at any desired angle, by any suitable means.

Fig; 10 illustrates a modification of the present invention particularly adapted for curved windows. The general construction and arrangement of the parts are substantially the same as that described in connection with the modification shown in' Fig. 1, although the screen members are positioned parallel to each other and normal to the tan- I nt of the curve .at its central portion. achscreen frame is connected by one or -morecurved bars 52 whereby the same may be swun from the position shown in full linesto t at shown in dotted lines. I

The ,operation .of the present device'fis substantially as follows :--The screen as a whole is ap lied to the window frame, as

above "descri ed, and the bolt 26 is remdved.

from the teeth in the wheel 25. Assuming the screen members to be m their uppermost position, they will be maintained 1n such position by the weights 21. When it is desired to extend thescreen over the window opening the lower frame members may be glrasped and pulled downwardly or away cm the upper frame members whereupon the screen will beelongated or extended and the pins 10 having been inserted in one of the openings 10 in each guide 4, the member 9 will serve to restrain contraction of the screens under the influence of the weights 21. Of course, it will be obvious that the screen members may be extended by rotating the drum 16 in a direction to raise the weights 21, whereupon the lower frame members will move down under the influence of gravity. The screen having been extended or contracted and fixed inpreferred position, a link 14 may be grasped and moved longitudinally, or, as in the present instance, horizontally in either direction, whereupon the screen members may be Sl'. multaneously rotated and disposed at substantially any preferred angle, the angular disposition of the screens being governed by the results desired. The least obscuring results may be obtained by setting the planes of the screens normal to the window opening whereupon both light and air may enter the opening which is tius practlcally unobstructed. \Vhen it is desired to partially shut out thelight and at the same time ermit the passage of air, the screen mem ers will be set at such an angle that the light passing the edge of one will fall upon the plane of another, the screens in such a position permitting air to pass therebetween so that ventilation is not substantially interfered with.

It will be observed that with the upper and lower frame members connected to the guide bars 4 as described, any horizontal movement of one of the lower members, for

instance by one of the links 14, will result in a similar movement of the upper frame member so that although the screen members may be of flexible material, such as canvas, both ends of the screen members are, similarly moved in horizontal planes by the manipulation of the screen supporting members. After placing the screenmembers in the desired position they are preferably locked in place by the bolt 26. As the sun moves around to'a differentrelative position in the course of the day, the screen members may be turned as may be necessary in the manner above described. The modification shown in Fig. 9 is operated in substantially the same manner and is particularly adapted for windows above the street level. It is quite clear that this form of screen may be used as an awning, permitting plenty of light and air to enter the room and also giving an unobstructed view of the street in both directions.

It is to be understood that the screening material used in connection with the screen members may be made of such material that the screen is rendered fire-proof. For example. the screen members may be ofsteel or other heat resisting material, 'so that when closed they are adapted to prevent fire from entering a window or other openingin which the screen may be laced.

It is thus seen that tiiis invention provides for a simple and practical device which will be comparatively cheap to manufacture and easy to install, accomplishing, among others, all the objects and advantages above pointed out.

many changes could be made in the above construction and. many a parently widely different embodiments of t is invention could be made without departing from the scope thereof, it is intended that all matter contained in--the---above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention, which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is: d

1. In a screen, in combination, a plurality of screen members placed in a row, means adapted to adjust the position-of said screen members angularly, comprising movable longitudinal members attached to said screen members, said longitudinal members being adapted, when moved. to move said screen members, upright rods placed at opposite ends of said row, each of said rbds' being provided with a wheel having depressions on the periphery thereof, and a bolt adapted to move into and out of said depressions and thereby retain said row of screen members in a given position after angular adjustment thereof.

2. In a screen, in combination, of screen members, a support therefor, means adapted to adjust the angular position of said screen members with respect to a vertical plane passing through saidsupport. means adapted to adjust the length of said screen members while permitting the angular adjustment of said screen members, and means adapted to adjust the angular position of said screen members with respect to a a plurality horizontal plane passing through said support.

In a screen, in combination, a plurality of screen members, a support therefor, means adapted to adjust the angular position of said screen members with respect to a vertical plane passing'through said members, means adapted to adjust the length of said members while permitting the angular adustment of said screen members. and means adapted to adjust the angular position of said screen members with respect to a horizontal plane passing through said support,

.ed .to adjust the length of. said members said members, comprising a projecting bar st-ituting a track, and means adapted to hold said curve at. substantially its middle point.- and longitudinal members attached to said comprising a projecting bar, and a device! associated with said screen members adapted to hold said members in a given position with respect to said bar.

4. In a screen, in combination, a plurality of screen members placed in a row, an upright rod placed at either end of said row, means adapted to adjust said screen members angularly with respect to a vertical plane passing through said members, means adaptwhile permitting the angular adjustment thereof, and means adapted to adjust the angular position ofsaid screen members with respect to a horizontal plane passing through constituting a track and roller members adapted to move upon said track, said roller members being attached to said upright rods.

5. In a screen, in coml'iination, a frame providing a window opening, a plurality of vertically disposed screen members arranged in said opening, means to move said screen members in one direction thereby to adjust their position with respect to the vertical plane of said opening, and means adapted to adjust the angular position of said screen members with respect to the horizontal plane of said opening, comprising a projecting bar, consaid screen members at a given position upon said track.

6. In a screen, in combination, a plurality of screen members arranged in a curved series, the plane of each of said=scrcen members being disposed in parallel relation with respect to the plane of each of the others of said .series, the plane of each of said screen members in its normal position being perpendicular to the tangent plane, touching screen members, said being adapted, when moved, screen members.

7. In a device of the character described, in combination, a screen, means adapted to support said screen, comprising a cord adapted to serve as an electrical, conductor, means adapted to adjust the angular position of said screen with respect to a vertical. plane passing through said screen, and means adapted to produce an alarm, com-- prising an electrically actuated device including said' cord in circuit, whereby when said screen is opened said means will be actuated.

8. In ascreen, in combination, a plurality of screen members, means adapted to adjust the length of said members, comprising a cord attached to each of said screen members, means coacting with said cord adapted to raise said members, said cord being composed of material adapted to conduct an electric current, a source of electrical energy longitudinal members to rotate said associated with the cords of said members,

and means adapted to produce an alarm whereby when any one of said cords is severed said alarm will be actuated.

9. In a screen, in combination, a plurality of screen members, means adapted to move said members in one direct-ion and thereby adjust the position of said members with respect to a vertical plane passing through said members, said means comprising longitudinal members attached to opposite sides of each of said screen members, contact members attached to one of said longitudinal members, a single contact member attached to the other of said longitudinal members, said single member being adapted to touch and to thereby make electrical contact with one of said other contact mem bers, a source of electrical energy connected in series with said contact members, and means adapted to produce an alarm whereby when contact between said members is interrupted sai d alarm will be given.

10. In a screen, in combination, a plurality of screen members, means adapted to rotate said members together in the same direction and thereby adjust the position of said members with respect to a vertical plane passing through said members, said means comprising longitudinal members attached to opposite sides of each of said screen members, contact members attached to one of said longitudinal members, a single contact member'attached to the other of said longitudinal. members, said single member being adapted. to make electrical contact with one or the other of said contact members according to the direction of movement of said longitudinal members, means adapted to adjust the length of said screen members, comprising a cord attached to each of said cords constituting an electric conductor and each being insulated from said rotatable rod, a source of electrical energy connected in series with the cords of each of said members and with said contact members, and means adapted to produce an alarm, whereby when the electric circuit is interrupted between said contact members and when any one of said cords is severed, said alarm will be actuated.

11. In a screen, in combination, a plurality of screen members, means adapted to adjust the length of said members, compris- .1ng a rotatable rod and. cords adapted to raise said screen members, each of said cords constituting an electric conductor, and being connected in series with respect to eachother, a battery connected in series with said cords, a bell circuit, an electro-magnet in series with said cords, and an armature associated with said magnet, said armature constituting a switch in said bell circuitwhereby when any one of ered said switch will move to close said bell Haus '105 members and a rotatable rod, each of sa d said cords is sev- I adjust the length of said 10 into said tube, and thence to successive screen members, a battery connected in series with said cord, a bell circuit, an electro-magnet in series with said cord, and an armature adapted to be attracted thereby,

5 said armature constituting a switch in said ity of screen members,

bell circuit whereby when said cord is severed said armature will move to close said bell circuit to thereby sound an alarm.

13. In a screen, in combination, a pluralmeans adapted to adust the angular position of said screen memberswith respect to a vertical plane passing therethrough, means adapted to adjust the length of said screen members, and

means adapted to adjust the angular position of said screen members with respect to a horizontal plane passing therethrough,

said aforementioned means being adapted to permit any one of the adjustments from any position of said screen members.

14. In a screen, in combination, a plurality of screen members, a support therefor, means adapted to adjust the angular position of said screen members with respect to a vertical plane passing through said support, means adapted to adjust the length of said members while permitting the adjustment of said angular position, means adapted to adjust the angular position of said screen members with respect to a horizontal plane passing through said support and means adapted to hold said members in a given adjustment.

15. In an apparatus of the character described, in combination, a pair of rotatable drum, and a cord connecting said connected to each r guide rods, a cord attached supporting members, pairs of links connecting said members, one pair adapted to move toward and from the other, said links being so connected to said members that the links of each pair move in opposite direct-ions as said members rotate, a plurality of extensible screen members extending between the pairs of links, means connecting the screen members to each pair of links, a winding drum and the movable pair of links.

16. In an apparatus of the character described, in combination, guide rods spaced apart, a link pivotally o a second link pivotally connected to each rod and movable toward and from the first link, a plurality of screen members pivotally connected to each link, a, winding drum supported by said to said drum link pivotally connecte means carried by the toward and from a pair of rotatable scribed, in combination,

a pair of parallel,

rotatable rods spaced apart, each rod having arms oppositely extending therefrom and stationary relative thereto, extending therefrom and dinally thereof, the latter rotatable relative to said' rods, links con: necting said arms forming pairs of parallel links, one pair movable toward and from the other pair, screen member supports pivotally connected tothe links of each air, awinding drum, cords attached to said d i'um and to said screen member supports, and means adapted to automatically rotate the drum in a direction to move one pair of links toward the other pair.

arms oppositely movable longituarms being non- 18. In an apparatus of the character described, in combination, a pair of rotatable guide rods rectangular in cross-section spaced apart, a link pivotally connected to 'each rod, movable arms having rectangular openings engaging said ide rods, a second to each arm and movable toward and from the firstlink, a

plurality of screen supportspivotally connected to each link, a winding drum, cords attached to said drum and connected to the Screen supports of said second link, automatic means to rotate said drum and thereby move said second link toward the first, and

secure the second lin in the position to .which it may be moved.

19. In an apparatus ofthe character described, in combination, a pair of rotatable supporting'members, pairs of links connecting said members, one pair adapted to move the other, said links being so connected to said members that the links of each pair move in opposite directions as the members rotate, a plurality of screen members extending between the pairs of links, and means connecting the screen members to each pair of links.

20. In an ap aratus of the character described, in com ination, a pair of parallel rotatable rods, each rod having pairs of arms, one pair of arms movable toward and from the other, links ivotally connecting said arms forming pairs of links, a plurality of screen members extending between the pairs of links, and means pivotally connecting the screen members to the links of each pair. v

21. In an apparatus of the character described, in combination, a pair of parallel rotatable guide rods, each rod having pairs of oppositely extending arms, one pair of arms movable toward and from the-other, means whereby said arms rotate with said rods, links pivotally connecting said arms uide rods adapted to,

. tate able longitudinally thereof, mounted to ro-' tate therewith, extending in opposite directions, links connecting said arms forming pairs of links, a plurality of screen members extending between the pairs of links, and means pivotally connecting the screen members to the links of each pair.

23. In an apparatus of the character de-- scribed, in combination, a pair of parallel rotatable guide rods, rectangular in cross section, each rod-having a pair of arms fixed thereWith,'said arms extending in opposite directions, and a pair of arms provided with a rectangular opening engaging said rod and movable longitudinally thereof, links connecting said arms forming pairs of links, a plurality of screen members extending be tween the pairs of links, and means pivotally connecting the screen members to the links of each pair. I

24. In an apparatus of the character described, in-combination, a pair of parallel rotatable rods, pairs of links connecting said rods, one-pair adapted to move toward and from the other, said links being so connected to said rods that the links of each pair move in opposite directions as the rods are roand screen supporting members pivotally connecting the lmks of each pair.

25. In an apparatus ofth'e character described, in combination, a pair of-parallel rotatable rods, pairs of links connecting said rods, one pair adapted to move toward and from the other, said links being so connected to said rods that the links of each pair move in opposite directions as the rods are rota t ed, screen supporting members pivotally connecting the llnks of each pair, and flexible screens connected to the screen supporting members and extending between the pairs of links. J

26. In an apparatus of the character de-' scribed, in combination, a pair of arallel rotatable rods, pairs of links connecting said rods, one pair adapted to move toward and from the other, said links being so connected -to'said rods that the links of each pair move in opposite directions as the rods are rotated, sc p en supporting members pivotally connecting the links of each pair, flexible screens connected to the screen supporting members and extending between the pairs of links, a rotary drum, and cords attached to said drum and to the movable pair of links, said cords being disposed to support the screens adjacent their edges.

' 27. In an apparatus of the character described, in combination, a pair of parallel rotatable rods, pairs of links connecting said rods, one pair adapted to move toward and from the other, said links being so connected to said rods that the links of each pair move in opposite directions as the rods are rotated, screens supporting members pivotally connecting the links of each pair, flexible screens connected to the screen supporting members and extending between the pairs of links, a rotary drum, cords attached to said drum and to the movable pair of links, said cords being disposed to support the screens adjacent their edges, and rotatable rollers carried by the other pair of links adapted to guide said cords.

28. In an apparatus of the character described, in combination, a pair of rotatable supporting members, pairs of links connecting said members, one pair adapted to move toward and from the other, said links being so connected to said members that the links of each pair move in op osite directions as the members rotate, a p urality of screen members extending between the pairs of links, means connecting the screen members to each pair whereby they are rotated as the links move,and means whereby space is left between the screen members at the limit of their rotary movement in either direction.

29. In an apparatus of the character described, in combination, a pair of parallel rotatable rods, pairs of links connecting said rods, one pair adapted to move toward and from the other, said links being so connected to said rods that the links of each pair move in, opposite directions as the rods rotate, a

plurality of screen supporting members members between the pairs of links, said rods being disposed in the path of movement of certain of said support-ing members.

In testimony whereof I aflix my signa: ture, in the presence of two witnesses.

LEOPOLD SIMON.

Witnesses J THOMSON, L. A. WATSON.

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