Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1639474 A
Publication typeGrant
Publication dateAug 16, 1927
Filing dateNov 11, 1926
Priority dateNov 11, 1926
Publication numberUS 1639474 A, US 1639474A, US-A-1639474, US1639474 A, US1639474A
InventorsWhitmore John P
Original AssigneeColumbia Mills Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Window blind
US 1639474 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Patent-ed Aug. 16, 1927.



wnmow nLnm.

Application inea November 11, 192s. sei-iai in. 147,740.

. This invention relates to blinds for controlling the admissidnof light through windows, doors, and the like, and articularly to blinds of the type known as enetian 6 blinds. The principal object of the invention is to provide a Venetian blind which will admit a-maximum amount of light to a room/while at the same time minimizing the glare upon the eyes of persons in the room.

Blinds of the type known as Venetian blinds comprise, in general, a plurality of flat strips extending transversely of the window orother opening, and disposed one above the other so as to provide spaces therebetween, and means for tilting said slats in either direction from the horizontal so as to control the admission of light through said spaces. Such slats may therefore be tilted into such a position as to reflect exterior light from the upper surfaces 'thereof into the room to light the same while wholly preventing or reducing-to a minimum the direct passage of .light rays between the slats into certain portions of theroom, for example,l

the lowerportionv thereof. This .is of material advantage, for example, in oflice rooms andthe like where persons are normally engaged within .said room and particularly inl the lower portion thereof, since it provides ample light within' the room without causing the light rays to reach thee es of such persons directly. Aparticular o ject of my invention'islto increase the reflection of 1i ht from the upper surfaces of the s'latsand t us provide an increased amount of indirect lighting while at the saine time reducing or maintaining `at a minimumA the reflection of light from the. surfaces of the 'slats which are-normally disposed inwardly toward the room under .such conditions.

The above objects are accomplished accordin to my invention by providing eachof sai slats of the'Venetian blind with a reflecting upper surface having a meli t tlic lusterl and a light absorbing lower surface capable of reflecting materiell less light than the uppersurface. Di erent means may be emp oyed for? roviding the slats withthe above describe *surfacesand tions embodying my invention.

The accpgpanymg drawings illustrate certain ein iments' of my invention, Aand referring thereto:

I will now describe certain specific construc` Fig. 1 is an inside elevation of a Venetian blind embodying my invention.

Fig. 2 is -a vertical section thereof on line 2--2 in Fig. 1.

Fig. 3 is an enlarged vertical sectionof one of the slats of said Venetian blind.

Fig. 4 is a partial vertical section on line 4--4 in Fig. 1 but with the slats tilted to a different position.

Fig. 5 is a view similari` to Fig. 3, vshowing a modified form of Slat.

The Venetian blind is shown as mounted, within a framel comprising vertical side members 1 and horizontal top and 'bottom members 2 and 3. Said frame maybe the frame of a window, door or any other opening ina wall, but for vthe purpose of illustration it may be considered` as being a frame of a window 1n an exterior wall of a room. Y

Anupper supporting plate or sill 4 is secured in position beneath ythe top frame member 2 and ma be provided with a roove 5' extending longitudinally thereof an with .pulleys 6, 7 and 8 rotatably mounted on shafts'9'therein. l l

A top slat 10 may be provided at its ends with projecting pins 11 which may be rotatably mounted in brackets 12 depending from the sill`4. Two fabricl supportiig` strips 13 may be secured at their upper en to the supporting slat 10so as to constitute loops extending downwardly 'to' the bottom .of the space to be occupied'by the blind. In

the bottom of the loo so formed a bottom slat 14 may be secure in any suitable man-- ner. A plurality of transverse supporting strips .16 of suitable fabric extend across bevtween the opposite'sides of strips, 13 at positions equally spaced throughout the height thereof and the transverse slats 17 rest upon said transversestri sv 16 and between the opposite sides of strips 13 and extend transversely. substantially across the entire width of the openin between the side membersl.

Lifting cor s 20 are secured in aiiysiiit` able manner to the bottom slat 1 .4-'aiidjpass upwardly through slots 22 in thel'slatsl( and Vthroughslots 23 `in the top slat '10 and over4 pulleys 6 and 7, thence through groove 5 and over pulle 8, and thence downwardly into position a jacent one, of the side members 1, said cords being advantageously joined togethery at their .ends or being formed as a j single so as toprov'ide a loop at position. Suitable means such as headed stud 24 may be provided so that the ends of said cords may be secured. thereto so as to hold the bottom Slat 14 in any position to which it may be-raised, as is customary in such devices.

In order to provide for tilting the slats of the blind, a cord 27 may be secured at one end to the top of the upper slat 10 as indicated at 28 and may extend around behind and beneath said slat as indicated at 29, passing over pulley 30 on bracket 12 and downwardly alongside one of the side members 1 to form a loop 3l, thence upwardly i in front of the upper slat 10 and around above and behind the same as indicated at 32, and may be secured at its other end to the bottom of said slat 10 as shown at 33. It

.may be seen that with such an arrangement pulling of the cord at one side of loop `31 will cause the slats'to be tilted in one direction while pulling at the other side vof said loop will cause the s'lats to be tilted in the reverse direction.

The upper slat l0 may be provided with a spring catch 35 adapted to engage in any one of a plurality of notches 36 in bracket 12 so as to hold said slat, together with the slats 17, in any one of a plurality of different positions to which they may be tilted by the tilting means above described.

The above described parts of the blind are all well-known in practice and form no essential art of my invention, but have been described in some detail order that a clear understanding may be had of the advantages of such invention. lAccording to this invention each of the slats 17 and also if desired the upper slat 10 an bottom slat 14) is provided with an upHer light reflecting surface 40 having a meta ic luster and a consequently high ca acity for light ,reflection and a hght absor ing lower sur- 'face 41 capable of reflecting materially less lightthan said upper surface. One meansl o formin ysuch surfaces lis illustrated particularly in Fig. 3 in which the slat 17 is shown as a strip of wood or metal, the upper surface vof which is coated with a light reflecting coating 40 consisting, for example, of metallic paint such as aluminum or bronze aint, and its lower surface coated with a i ht absorbin material, such as a non-metallic paint. he aluminum paint which may advantageousl be used for coating the uppe'r surface ofy the slats consists of aluminum powder in a body of lacquer or varnish or other suitable material. Y Y Underl normal conditions, with fairly strong light outside,.theV blindmay advantageously be adjusted to a position in which vthe slats are inclined outwardly and downwardly forexample, to the position shown in Fig. 2. With the slats in such position a relatively small amount of light is per- `with an upper surface ha eyes ofthe persons in the lower portion of the room and below the level of the major portion of the blind is substantially entirely.

prevented. Light rays indicated at a, however, strike the upper surfaces of the slats and are effectively reflected therefrom as indicated at b so as to strike the ceiling 0r the opposite wall of the room and thus light the same indirectly. Light rays such as 1ndicated at a however, upon being reflected as at b', strike the lower surfaces of the slats and are largely absorbed thereby so that there is a minimum amount of li ht reflected from the lower surfaces of the s ats to the eyes of persons in the room. It is possible, therefore, with such a construction, to look .d-

rectly at the blind without obtaining anyv effect of glare, asall that is seen is the light absorbing lower surfaces of the slats, While at the same time the room is well lighted by means of the light rays reflected from the upper surfaces of the slats.

It will be understood of course, that the Venetian blind above described may be adjusted to any other desired sition. For example, when the exterior hght is dim as in case of cloudy weather the slats may be inclined downwardly and inwardly as shown in Fig. 4 so as to permit a eater proportion of the li ht rays from t e exterior to pass directly through the s aces 15 between the slats as indicated at c. i en the slats are in this position they 'also serve torefiect light from the exterior into the room, while at the same time no objectionable glare is produced, since the persons in the room are in general somewhat'below the `level of the major ortion of the blind and hence would see on y the edges or the lower surfaces of most of the slats, while even if' the upper surfaces of such slats were visible from certain rtions of the room, there would be but little reiiection therefrom owing)to the dimness of the exterior light.

' ther means ma be employed for pro- .yiding the light re ecting and light absorbing surfaces of the slats. For example, as shown in Fi 5 each of the slats 1 may constitute a at strip of met-a1 whose upper surface 40 may be polished or otherwise treated so as to .give it a hi h metallic luster and' a co uently hig reflecting power, while a coating 41 of suitable ht absorbing material such as vnon-meta c paint may be applied to the lower surface thereof.

I claim:

`1. In a Venetian blind, a slat lprovided a metallic luster and a wer surface of lig t absorbing material.

.2. in venetian blind, l ne provided Lese-,474 i "3 with .lghc'reniing u mim having a light absoring coating 'of non-,metallic a metallic'luster and a lixhrabsorb' lowerA paint on its' lower surface.

l surface capable of reflecting materia y less In testimony whereof I have hereunto l. light than said upper surface. subscribed my name .this 3 day of November,

3. In a Venetian blind, a slat comprising 1926. a flat strip having a light reflecting coat of metallic paint on its upper surface JOHN IP. WHITMORE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2549167 *Nov 15, 1945Apr 17, 1951Henry J BrubakerLight controlling means
US2572957 *Nov 26, 1948Oct 30, 1951Shaw Robert PRoom illuminator
US2857634 *Feb 9, 1956Oct 28, 1958GarbadeReversible slat assemblage
US3048375 *Dec 19, 1960Aug 7, 1962Radiant Ceilings IncMeans for controlling radiant heat loss or gain
US3992053 *Sep 26, 1974Nov 16, 1976Lewis David HrytzakSun shield for automobiles
US4018024 *Sep 22, 1975Apr 19, 1977William StelzerLouvered windows comprising insulating pairs of superimposed panes
US4327795 *Jan 12, 1981May 4, 1982Wheeler Everett TWindow casement
US4508154 *Dec 2, 1983Apr 2, 1985Wheeler Everett TWindow casement
US4773733 *Nov 5, 1987Sep 27, 1988John A. Murphy, Jr.Venetian blind having prismatic reflective slats
US5121785 *May 27, 1988Jun 16, 1992Yamaha CorporationImproved slat for blinds
US5388000 *Dec 14, 1993Feb 7, 1995Bartenbach; ChristianAnti-glare fitment
US5765307 *Sep 20, 1996Jun 16, 1998Grimes; Ronald R.Window blind systems
US6119759 *Apr 11, 1997Sep 19, 2000Assaad; ElieOpening and closing device for use with a shutter system for protecting a building space
US6450235Feb 9, 2001Sep 17, 2002Han-Sen LeeEfficient, natural slat system
US6763873Apr 10, 2002Jul 20, 2004Han-Sen LeeEfficient, natural slat system, covering and method
US6769472 *Apr 30, 2001Aug 3, 2004Han-Sen LeeEfficient, natural slat system and covering
US7055231 *Jul 17, 2003Jun 6, 2006David BlachleyMethod of manufacturing a prefinished fiberboard shutter
US7536766May 3, 2006May 26, 2009David BlachleyRemovable louver shutter assembly method
US8091281Jun 15, 2004Jan 10, 2012David BlachleyRemovable louver shutter
US8522478Mar 12, 2005Sep 3, 2013David BlachleyReady to assemble shutter
US20050056382 *Jun 30, 2004Mar 17, 2005Sassan KhajaviWindow blinds with rotating slats that have different faces
US20060022376 *May 12, 2005Feb 2, 2006Prince Kendall WWindow covering parts and apparatus and methods for making the same
US20060113046 *May 12, 2005Jun 1, 2006Prince Kendall WStiffened parts for window covering and methods for making the same
US20060191648 *Feb 28, 2005Aug 31, 2006Vlach Dennis PVertical blind with outward facing radiant barrier
US20070183053 *Apr 6, 2005Aug 9, 2007Ellemor John WLight absorbing elements
US20080202703 *May 3, 2007Aug 28, 2008Ian Robert EdmondsDaylighting system comprising light re-direction elements in a Venetian blind
US20080271856 *May 15, 2006Nov 6, 2008Koninklijke Philips Electronics, N.V.Daylight Shielding Device
US20110083817 *Apr 14, 2011Levolux A.T. LimitedExterior Solar Shading With Light Redirection
WO2005003498A2 *Jun 30, 2004Jan 13, 2005Sassan KhajaviWindow blinds with rotating slats that have different faces
U.S. Classification160/236, 49/74.1, 296/136.1, 359/596
International ClassificationE06B9/38, E06B9/386
Cooperative ClassificationE06B9/386
European ClassificationE06B9/386