US1761061A - Ventilator - Google Patents

Description

2 Sheet s-Shee? 1 H. L. VAN ZILE VENTILATOR Filed June 20. 192a 7 8110111110; 77mg .Vrm Z 7' 7e June 3, 1930.

1 i: g a

I June 3, 1930; V N z VENTILATOR Filed June 20, 1928 2 SheetsSheet 2" anoeni oi 715W A 147/7 Z775 $51 M a t tome Patented June 3, 1930 HARRY L. VAN 'ZILE,

or NEW YORK, N. Y. I

, vEn'rILA'roR Application filed June 20,

The present invention has reference to ventilating devices and relates particularly to the species thereof applicable to doors or the like, to afford ventilation thru the same.

' Primarily, the object of the invention is to produce an improved device of the class aforesaid, Wherein'the opening by way of which the air currents pass, is divided into cell like passages, 'so constructed and arranged'as tooffer the leastobstruction tothe flow of air th-erethru; the currents in entering or leaving theventilator are diffused by one 'or nore closures movable at substantially right angles against the open ends of the air passages in order to avoid disturbing direct drafts;the exterior edges or boundary limits of the closures and the partitions being disposed in offset relation, thereby preventing vision, and passage of light inevery direction.

A secondary object is to provide a device of the nature mentioned with a closure which, When shut,will effectively subdue encoun-- tered acoustic waves, thus hindering the I transmission of sound from one room to an-' other thru a door equipped with this ventilator.

A third object is theprovisien in a device of the'type set forth, of means for holding a closure partly or fully retracted from the opening wherewith it is associated.

A fourth objectis the production of a device of thecharacter disclosed,adapted for insertion into an opening out therefor in a door, without thense of molding or other extra trim ordinarily employed for such purposes.

A'special object of the invention is to sup ply a device of the kind referred to, which shall be distinguished by its attractive appearance, affording as well full andnniirn paired circulation of air therethru.

A general object is to furnish a device for the purposes stated which'shall be strong and rigid altho composed of light material;

readily cleaned; easy and" noiseless to operate;'not liable to get out of working order; and capable besides of economical manufacture.

Other objects of the invention will in part be obvious and in part be brought out more i I, certain'parts being in section and other 1928. Serial No. 286,943.

OFFICE" fully in'a detailed description hereinafter contained.

The inventionconsists in the various combinations and subcombinations of elements, arrangements and interrelative disposition of parts, andpeculiar features of construction pertaining to the improved device,- as herein described and defined in the appended claims.

Practical embodiments of the invention are, illustrated on the drawings hereto annexed and wherein Figure I is'a combined plan view and section of one exemplification of this improved ventilator, the section being taken on the line I "I of Fig. II,:loo'king down thereon, With parts broken away, 1 i

Fig. II is an enlarged fragmentaryl front view, looking inan upward directionin Fig.

parts being omitted;

Fig. III is ail-enlarged cross-section, taken on the line IIIIII of Fig. 1, looking froin'the left toward the right, the parts being in extended or open relation;

' .Fig; IV is also an enlarged sectioiitaken on the line IV-IV of Fig. I looking'froni right to left, the parts being shown in closed or collapsed condition.

Vis another enlarged section taken on the line VV'of FigLI looking in the same st direction as for the preceding figure, name- 1y from right to left, the parts being illus i trated'in their closed position; i

I Fig. VI is a fragmentary rear elevation of a somewhat modified form of the invention, certain parts being broken away; e

VII is alfragmentary top plan view 1 of the modification shown in Fig. .VI, the parts being depicted in open relation; and

"Fig. VIII is a perspective view of a detailpertaining to a connection between the parts.

succinctly 0utlined,'the invention. as it exists in the embodiments thereof, herein exemplified, comprises a flanged frame adapted for insertion into an opening provided therefor in a door to which it is applied, with theflanges ofthe frame. overlying-the door onits inner'side. This frame is interiorly divided into a plurality of therefrom to graduate the flow, the movevantages.

of the ventilator.

ment of the closures taking place against the V ends of the cells for the purpose of difi'using the currents and avoiding the disturbing influences of drafts. Even in full open or extended condition, the offset relation of the closures perimetral edges to those. of the partitions, effectively obstruct vision and light rays atevery angle and from either side A soft medium attached to the inside face of one of the closures serves whilethe latter is pressed against the adjacent face of the frame to deaden and exclude sound waves striking the ventilator.

Obviously, the greatest benefit will be derived from the invention by using it in its entirety after the manner hereinabove expressed, although it may be noted that an operative device of acceptable design may be produced by employing a less number of parts with correspondingly diminished ad- Further, it will be observed by experts familiar with inventions of analogous import, that the combined frame and closures herein disclosed are susceptible of various modifications having the same end in view. ,Therefore, let it be understood that the annexed drawings are offered by the way of example only, and are not put forth as representing the sole means of reducing the invention to practice.

Referring now to the before mentioned views for a detailed description of the invention, the same comprises a frame denoted as a whole by the reference numeral 11 and composed of relatively narrow top and bottom, right and left side strips numbered 12, 13, 14 and 15, respectively, preferably of metal plate, such as sheet steel.- Of these strips, the top and bottom ones are considerably longer than the side strips so that an elongated, parallelogrammic box-shaped structure of constricted width and of comparatively shallow depth is formed. This box frame is of suitable dimensions to be received in an opening cut therefor into or above the uppermost panel of a door A. The near, side edges of the top and bottom strips 12, 13, are extended upwardly anddownwardly so as to constitute flange-like appendages 16, 17 respectively, adapted to overlie the face of the door at the inner or room side thereof. Obviously, any other means whichwillv locate the frame 11 relatively to the depth or thickness of the door A, can

equally as well be substituted for the flanges 16, 17.

lnteriorly, frame 11 is divided up by lengthwise or crosswise running, unequally spaced partitions 2122 and 232 l25 26 27, into a plurality of endwise open, straightsidcd cells B, O, D, E, F, G, H, J, K, L, M, N, P and Q, of different sizes. From Fig. 11 which represents the lefthand, half portion of the frame in full size, it will be noted that the upper and lower end cells, designated. B and K, and substantially of the same dimensions, are about half the size of cells C and L. The proportions of the latter are again half or nearly so of cell 1), while lower cells M and N, separated by a sub-partition 29, together equal cell D in area. Cell E included between transverse partitions 2627, is somewhat more than twice the size of cell D, while the lower tier of cells P, Q, divided by subpartition 30 have each fifty percent of the area of cell E. The intermediate row of cells F, G, H and J, altho of the same length as the cells in the corresponding upper'row, namely B, O, D and E, have only about half of the vertical height of the latter. Interposed betweenpartitions 24 25, is a rather narrow cell space or compartmentR which reaches from the top to the bottom strip. The purpose of the aforementioned cells will be more fully hereinafter referred to. It will be understood, that the other or rigat hand portion of the frame will be arranged on the same order as the left half just above described. And it is also plainly seen that by adding or leaving out. one or more of the middle cells E, J and PQ, the said frame may be increased or shortened in length, to fit any particular size of door required.

The extremities of the three species of partitions, 2122; 2S-24E-2526-27 and 2930, as well as the boundary strips 12-13 and 1516, are bent over right angularly as indicated at 32, 33, 34 to form feet or flanges, by means of which all. of these parts may be anchored in position, thru the agency of electric spot-welding, or by any other appropriate method of fastening. Where the various partitions cross one another, their intersections are oppositely notched out, as exemplified at 36, 37 (Fig. VIII), in order to fit one into the other and leave the edges thereof flush or even with the front and rear faces of the frame. The interfitting joints of the partitions taken in conjunction with the endwise anchoring thereof to the perimetral strips constituting the frame proper, is conducive of a very rigid and compact structure, capable of being manufactured from light sheet material. By reason of the fact that all of the exterior and interior parts of which the frame is constructed are disposed in parallelism with. the flow of the air passing between them or thru the cells encompassed thereby, no appreciable diminution of the flow takes place, such fits-for instance does occur when the partitions oryanes, as they may also he term-edema in oblique or angular, relation to the passing 'cifi'rents.

For the purpose of diffusing the air currents as they travel in either direction by way of the cellular frame, and to obviate 'dirent-air drafts from one roem to another, as well as to obstruct undeviating rays of light and vision therethru, one or more closures "4'0,

' i 41 areprovided. These closures ma if desired, be made to cooperate with either, or both of the front and rear faces of the said frame, i. e. on opposite sides of the door. A

convenient way of mounting the afore'named closures or cover plates, so that they may he moved away from or up against the fr'arnes faces, in graduated amounts, is clearly depicted in Figs. III and IV.

' The means for carrying the closure plates 40, 41, may include-upper and lower pairs of interconnected links 42 43, 4445 respectively, disposed in sets of four each, spaced a short distance from the'transverse ends of the frame 11. The links spoken of, are locat'ed betweenthe partitions 24, 25, within the narrow vertical cells B. The lipper por tio'n's'of said partitions are provided centrally with 'aligned guides that may he in the nature ofelonga'ted apertures '47, wherein are slida'bly received the terminals of a stud "48, one for each ofthe said cells B. To the shanks of studs 48 are jointly pivoted the upper extremities of links 42'43, the lower ends whereof have hinge connections with oppositely arranged ears 50, resp projecting inwardly from the closures 40, 41, in proisi'inityt'o the bottom edges thereof. The lower extremities of the other pair of links 44, 'ar'ehinged together on 53 fixed in the middle of said partiti'ons24, 25, in close adjacency tothe bottom strip 13 of the frame 11.

Slotted ears 56, 57 areattached to thefsam'e sides of the closures 40, 41, respectively, as the before mentioned ears, 50, 'el heing substantially aligned therewith, hut in contiguity to the top edges of. the said closures. The upper limits of the lower pairof links 44, 45 are pivotally connected to ears 56, '57, while intermediately; of their lengths these links are movahly jointed by shoulderedlri V- ets 58, 59 to the npperlinks '42, "43 respectively. I i

By preferenceand =asxshown, a rod '61vis arranged to, extendloetween the lower and outer ends of the links42 pertaining fto'both sets thereof, at the front, side of thefranie 11L Said rod is adapted to be engaged by the interiors of downwardly open gaps 62 (Fig. 111s wherewith the 'a'foresaiid'ears are 'formed; The latter, of which there may be several, as will lo'eohser'ved from Fig. I,*are

spaced at certain intervals :epart along the ectiyely,

constricted so as to require urging-overthe rod 61, thus'making itneces'sary to apply some force to frfeebr disconnect the ears 50 from the said'ro'd. The yielding connections of the lower'and u 'oper terminals of the links 43, 45 with the ears 51, "57', respectively, {on the outer or rear closure 41, "optionally be made permanent, that is,"not disconneetihl'e, no need exists for removing the "clos'nre last referred to. I rearward'ly "projecting, outer eictremities'of the lihks 43, 45, may be jointedlyconnected For this asbmwhe to the npp'er and lower ears 57, 51- bysh'oul dered and headed studs 67-, 69 respectively, fixedly "secured to the" last -'named links,

operator, against "either one of the "closures, in a direction against the frame, to' move them from open to' the fully closed position thereof illustrated by Figs. IV -an'd V, the

studs 48 to which the sets of links42, '43 are pivoted,- travel upwardly iiithe elengated guide apertures 47. contemporaneousl the studs 4, 69 will also "move in an upward direction withinthe islets of theeafs 56, 57 By'virtne of the 'censtr tioiiehtwn and descrihed,"the in'oi efnentsofthe front and rear closures 40, 41, towards enemy from one 1 another, "always take place in planes parallel with'the corresponding facesjof the frame 11;.

. Besides, these erasures can he eonveniently opened and closed in gra'duated amounts so as to permit mo er-less air pass thruthe 'cell'uQ larly divided frame. In entirely-b'p'eii condition, the areas defined by th l'in'ear measure- "ments of the perimetral edges of the closures multiplied by their distances away from the frames'faces, a're'fsuchasto establish an airflow capacity aroundrthe' edges of the closure and between the latter and I the'fra-me', considerably inexcess ofthe air-flow capacity thru the said frame, Thus itwill be comprehended, that; practically ,no diminution 6f the flow oft-he air ctirrentsdo occur in transit thru this ventilator, 'Still no'di'rect drafts can reach the occupants-off a room the door whereof is fui'hish'edfwithhne of these devices. This is becaiise the fair flowing 'by way 'of the latter is forced-liar a short distance to ifol'low the door before itei-fters and passes their the frame, In issuing at theoppos'ite side? of the-"ddei', the "air-is s reader) and down as well as sidewise in every direction before it diffuses in to the room.

With the object of reinforcing and promoting rigidity of the rear closure plate 41, the same is channelled thruout its length, as indicated at 7 3. At the lateral extremities of the said closure, the channels or corrugations spoken of, are made to taper or converge into the plane of the plate proper, giving the closure a neatand finished appearance. On the face of the front closure 40 adjacent to its bottom edge, are provided one or more hollow, shell-like grips 74 that may be formed by striking up the same from the plate of which this closure is composed.

In order to provide clearances for the rod 61 in the forward edges of the full size transverse partitions 25, 26 and 27, the same are notched out as depicted at 75 (Figs. IV and By virtue of the reason that the subpartitions 29, 30, are of less depth than the main '.divisions,the former do not require notching of their frontwise facing edges.

' The rod just above referred to, moves into and is received in said notches when the closures are shut tight. VJhile two of such clo sures have been shown, it is entirely feasible to employ only one of them, preferably the front plate. The rear closure 41' and its carriers, namely the links 43, 45 may well be omitted, without detracting either from the operativeness or efficiency of the device, except that the cell forming partitions will be exposed from the doors exterior.

No matter at what angles or directions lines are drawn tangential to the perimentral edges of the closures, these lines will intersect one or more of the transverse and longitudinal partitions. Or stated in other words, one or the other of the aforesaid partitions will obstruct any and all lines of sight or rays of light, from either side of the device, thus rendering it impossible for a person standing outside of the door to look thru the ventilator into the room, or vice versa, irrespective of the position in which this person stands or occupies.

The reason why the partitions adjacent to the transverse extremities of the frame 11, are spaced closer together, making the end cells smaller in size than those in the middle,

' is because these end compartments are protively exclude all rays of light and obstruct vision in every direction.

At 76, 77 are indicated that fins or ribs project inwardly of the narrow vertical cells B, from the partitions.24- defining the same. These fins serve to block vision thru the last named cells whether the closure-carrying linkages are wholly received therein or extended outwardly therefrom. It will be observed thatthe upper ends of ribs 76, 77, which are located in reversely offset disposition on opposite sides of the guide apertures 47, reach in parallelism therewith from a point about halfway between the extremities of the said apertures, downwardly within a short distance above the fixed hinge pins 53. The major part of each of the fins referred to, is obliquely disposed with respect to the perpendicular direction of the said guide 47, for the purpose of affording proper clearance between the inner side edges of links 45, 46, when the latter are in folded condition.

From an inspection of Fig. IV it will be observed the relative positions of the link 42 and the rib 47 (shown in dot-and-dash lines). A convenient way of producing the said ribs or fins is by slitting around three of their sides and bending them up at the fourth sides thereof, at substantially right anglesto the fiat faces of the strips whereof the paritions 24, 25 are formed, in opposed relation, inwardly of the said cells R. The openings remaining in the said partitions after the fins in question have been struck up therefrom, do not in the least interfere with the light and sight obstructing properties of the aforenamed partitions.

The front closure is preferably made in the nature of a shallow box with outstanding cumambient edges at the interior face thereof. Within walls ,7 8 is received a fiat dishshaped frame 79 composed of a bottom (79) and sides 80. Inclosed by the latter and overlying the bottom is a thick piece of sheet felt 81, or other appropriate sound deadening material. The outer edges of framesides 80 are bent, as denoted at 82, inwardly over this material so as to retain the same in place. In a similar manner are the corresponding edges of the walls 78 folded over the first namedside-edges 82, as represented at 88, to secure the interior frame 79 in its assigned position within the closure 40. At such times as this closure is pushed up against the frame 11, the felt facing 81 is forced into close contact with the flanges 16, 17 and the therewith flushedges of side strips 14, 15.

The effect of this arrangement is that transmission of acoustic waves from sideto side of the door thru the device is entirely subdued or prevented. Even rattling of parts occasioned by forceful shutting of the door, is quieted down to such an extent. by the felt packing, to make all vibrations of this kind perimentral walls 78 surrounding its cirtrain r practically unnoticeable. Any desired means for retaining the frame: 11 in position, may of course be employed, such for nstance as suitable screws (not'shown) entered lnto the material'of which the door is made, thru appropriate openings provided therefor in one or bothof the top and'bottbm strips 12,

13, of the said frame. I

- The exemplification of the invention given by Figs. VI aiidVII, is practicallvthe same asthe previously described structure, except that certain details thereof have been modified as will hereinafter appear. Thus it will be seenthat instead of having three rows of cells in vertical height, this modificationof h v n ilator ay be v ded. u i o .en y two. tiers, the upper and lower cells whereof, which are alike, bein Y numberedC D and loped edges 782 of the' supplementary vframe r fasfenfedfoth lqs res nertransverse face. .4.

' itud ea q nd ry s ps, fo s n e the upper ne 12% b yon he fe t-lpad on ai 79. which is etral walls 78* 4 ."j' In the space intervening between thelast named walls and edges, is containedlthe linkage by means ofwhichthe single closure is operablysustained from the frame lla At each Q closure is oscillat ably mounted a link me lt 48*, having rigid, double'arms l QflfiB, provided at their ends with hook-shapedotf: sets {91that are received in elongated guides 47* attached to the front "faces of the top d t m fl n es 62 7.5 The fse w armed thf fi a r le ure are afiet e c i m un p i y n le wi e d r n o er e wit ni aidf g de 7% While t e dy p r ion of le' same i h P r a s o w eck ng mo.- tion, is retained in position by keepers oOe Disposed in parallelism withthe frames long ns rame 9 o a to. c r th same; and i g t ngu art ela on tethe i first men: on d el m n 8% i anot er l nke em nt 53?; r he att r s os i lat bly carried by re:

' tainers 51 from' onelof the flanges .16, The

[ranged to divideitinto compartments of .dif

feIiehtISiZS, Of -'Said. 'coinpartrnentsfone nearthe centreof the frame is the largesgone last named element, hich alsojhas the longer bod'yportion, is in conformity with the shorter link element 485,;forin'ed with arms; t

' such a manner,

withthe opposed flanges 16?, 17. .1 illustrates the closure retracted from the door n place of individual" iselesed' i not vlimiteol position i by over-lapping 'scal{ V spaced inwardlyfromthe perim-l f the transverse extremities ofthe 6 6-.

' the; like ieqmprising a one whereof is indicated at 44?. The extremity of" this'arm is provided with an offset 52 that is afforded limited travel with-i in a guide 56'f aflixed to the closure' lOin proximity to the body portionfof the, element 48*, as will be readily observed rmm an inspection of Fig. VI. The arms ofthe hereinabove referred to, rightangularlyafl a d nk-e m n 's 4 v t with their respective guides 47*" and 56?; iiithat not only is the single closure 40 enabled to move into open or closed positions, but the movement the said closure is always maintainedi p'arallel "Fig. VII

inserted frame 11 that is, inentirely open er i qn w t espe 9 eeel S" %-D By reasonof the fa'ctthat the closure 40 is om the linir elen ents suspended sidewise fr specified, the weight of the formerfsufiices to 1 hold the latter in the positioninto which they are moved, by the operator manipulating itlie said closure.

' tothe precise fea tures ,of construction and arrangement'i r P r s haw a i d, nor to any Par ticular flstructural make-up. 61' design. w 'ieh i a red ed o Pra ti e as, n merous, changes may bemade in the details With depart g fromth nr miphset h I rific n any fi s hief invention, or even vantag s-. t. v "Hav ngl w d erib in en e W at I la m by Letters Pat 0f r A'ren l e f ers r he like 9 1; pri i m a pl ality o ghtrobstruetng mem er inter y of said fram a 19: u s r et i lud ng a ramereverfand disposed across the -face' of the frame for f ame; jbeing pr ject beyo d he; lat erin L re pos on fvthe lo u e 1 "A venti tor for i ser ion in door p.1

and 53 cooperate In its broader-aspects theinvention herein 7 a novel r n a d des t protect he United States is ioo mevem at e y-t0 b t Who ly eyond a -m an for ecinr-q ab y. i on-,

he li e compr i g a re tangu a frame;

plurality of spaced apart vision prjeventing em erstwit n h la r,

saidmem ers bet ing d p sed in'pl nes parallel w Sides of I aid e; a clos re cooperating wi hv th spa betwee h said: por ngmea s fo said losuresincluding closuref alway's parallel tota given plane I 3. A ventilator for rectangularfframe, a

plurality. of. members within the latter "arinsertion-in a door, or

members, and: sup:

i ipro 'ab e ementscoas ing to maintai-n the eral places and more remote from said frame centre is small er, and one further away therefrom is still smaller, and a closure movable away from the said frame to open up the said compartments to the flow of air therethru, said closure be ing of greater size than the face of the frame to an extent at least suficient to block all of said different size compartments to the passage of light thru the same, when the closure is moved into any of its compartment uncovering positions.

L'A ventilator for doors or the like comprising a rectangular frame, a plurality of Vision obstructing nembers therewithin, said members being arranged in substantial parallelism with sides of said frame, a closure disposed across the face of the latter, and means hingedly carrying said closure at sevrestricting the movement thereof with respect to the frame to maintain the closure always parallel with the frames face. 7

5. A ventilator, for doors or the like comprising a frame, a plurality of light obstructing members arranged. in parallelism with sides of said frame, a closure disposed across the face of the frame, and means carrying said closure affording movement thereof in planes parallel with the frames face, said means including a suspendingelement pivotally connected to the closure and covered therebywhen the same is moved to abut the face of the said frame.

6. A ventilator for doors or the like comprising a frame provided with vision obstructing members interiorly thereof, a clos ure disposed across the face of said frame, and elements having pivotal and slidable connections with the frame and said closure arranged therebetween, a portion of said elements extending beyond the faceof the frame when the closure is opened.

7. A ventilatorfor doors or the like comprising a'frame provided with space apart light intercepting members interiorly thereof, a closure disposedacross said frame and prising a frame and'away therefrom,

movable in parallelism toward and away from the face thereof, and a sound-deadening cushion carried by said closure and overlying a plurality of the areas included between said members when the closure is moved to maximum adjacency to the said frame.

8. A ventilator for doors or the like comprovided with spaced apart vision obstrucing members interiorly thereof, a closure extending across the face of said frame and translationally movable toward and a sound-deadening cushion carried at theinner side of saidclosure adjacent the face of the frame, said cushion being adapted to overlie-said face and a plurality of the areas bounded by said members'when the closure is moved to close the ventilator againstthe passage of air therethrough.

9. A ventilator for doors or the like comprising a frame provided interiorly thereof with spaced apart light intercepting members, a closure capable of covering the face of said therefrom, and a s0und-deadening cushion disposed at the inner side of said closure adjacent the frameadapted to cover its face and overliea plurality of the spaces between said members upon being moved thereagainst the perimetral area between the edges of the closure and the surface of the frame, when the closure is fully open, being substantially greater than the face-area of the frame.

' 10. prising a rectangular frame provided interiorly thereof with vision preventing members, said members being disposed in parallelism with sides of said frame, and a closure mounted to extend across the face of the frame, said closure being parallely movable toward and away from the frame and having a somewhat larger face area than the latter, such mount permitting an air-flow capacity between the perimetral edges of the closure and the face of the'frame which is substantially greater than the air flow capacity through" the said frame, when the closure is fully open.

11. A ventilator for doors or the like comprising a rectangular. frame provided interiorly thereof with. spaced apart light obstructing members, a closure extending across the face of said frame and movable to open or close the same, said closure having an area substantially greater than the frame but the air-flow capacity around the edges of the closure and between the latter and the surface of the said frame, when the said closure is fully open, being greater than the air-flow capacity through the frame, and pivoted closure operating means connecting the closure to the frame. i

12. A ventilator for doors or the like comprising a frame provided interiorly thereof with spaced apart vision obstructing members, a closure disposed across the face of said frame for movement in parallelism with the frame-plane, pivoted means connecting the'frame and the said closureserving to retain the latter in any position parallel to the face of the frame, and means permitting ready removal'of the said closure from said connecting means to expose the spaces between said members. 7 a

13. A ventilatorforndoors or the like com prising a frame provided interiorly thereof with spaced apart vision intercepting vane members disposed inparallelism with sides of the frame, and a closure extending across the face of the latter and suported for movement away from said frametoany predetermined limit of separation from the frame, the dimensionsof said closure being such that in any adjusted position .of it within such frame and movable toward and away A ventilator'for doors or the like comlimit of separation from the frame'a line of 1 vision drawn across its edge through the one or I frame opening will be intercepted by more of the said vane members. x '7 14. A ventilator for doors or the like com prising a frame provided interiorly thereof With vision obstructing vane members, c10s ure members capable of coacting with opposite faces of said frame, and mechanism operatively connecting'said closure With the frame affording them movement in parallelism toward and'away from the respective faces of the said frame.

' HARRY L. VAN ZILE.

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