US 2266160 A
Description (OCR text may contain errors)
- Dec. 16, 1941. F. J. BURNS SPRING ACTUATED BLIND 2 Sheets-Sheet '1 Filed Dec. 26, 1940 'INVE NTOR 1941- F. J. BURNS SPRING ACQTUATED BLIND 2 Shests-Sheet 2 Filed Dec. 26, 1940 gn w VENTOR. a 7776 Patented Dec. 16, 1941' 2.266.160 srnmc ACTUATED nnmn Fred J. Burns. Saginaw, Mich., assignor to The Columbia Mills, Inc., New York, N. Y., a corporation of New York Application December 26, 1940, Serial No. 371,633 9 Claims. (01. 156-17) This invention relates ,to Venetian blinds and more particularly to means for the operation thereof.
One of the prime objects of the invention is to provide a spring actuated Venetian blind in which the raising and lowering of the slats is accomplished in the manner of an ordinary window shade.
Another object is to provide a spring actuated blind which eliminates the conventional lifting cords and the cord looking or anchoring means associated therewith.
A further object is to provide a practical and effective spring actuated blind operable in the same manner as is a window shade for evenly raising and lowering the blind, and which holds the slats in any set adjusted position.
A still further objectis to provide a spring actuated blind in which the actuating means is compact and readily assembled, and which is designed to lessen spring friction and eliminate fatigue.
A further object still is to provide a blind composed of relatively few parts, simple in design and rugged in construction, which can be economically manufactured and readily assembled.
With the above and other objects in view, the present invention consists in the combination and arrangement of parts, hereinafter more fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims, it being understood that changes may bemade in the form, size, proportions and minor details of construction, without departing from the spirit, or sacrificing any of the advantages of the invention.
In the drawings: r
Fig. 1 is a'longitudinal frontelevational view, showing my spring actuated blind with the face board of the head box broken away to show the interior;
Fig. 2 is a top plan elevational view;
3 is an enlarged transverse sectional view taken on the line 33 of Fig. 1;
Fig. 4 is also a transverse sectional view taken on the line 4-4 of Fig. 1;
Fig. 5 is a similar view taken on the line 5-5 of the tilt spools showing the tape opening therein.
Referring now to the drawings in which I have shown the preferred embodiment .of my invention. The numeral 8 indicates the head box of the blind which is adapted to be mounted and supported on suitable brackets 9 provided on the window casing l0. End and intermediate brackets -l I, I2, and I3 respectively, are mounted in the head box 8 and a horizontally disposed shaft 1 4 is journaled therein, one end of said shaft being fiatted as at l5 to engage and extend through the hub l6 of a worm wheel ll, said hub being journaled in an opening B provided in the bracket I3, and a small collar 18 is provided on the opposite end of the shaft l4 adjacent the bracket H to prevent longitudinal shifting thereof.
Cylindrical tape spools [9 are mounted on the shaft I4 in spaced relation, said spools being open at one end and having hubs 20 cast integral therewith, or may be made up of assembled stamped parts, and set screws 2| are provided in said hubs to facilitate securing the spools on the shaft. A longitudinally disposed gap or opening 22 is provided in the cylindrical surface of the spool l9, and slotted openings 23 are provided directly adjacent the ends of the metal to facilitate the attachment of the upper ends of the ladder tape 24, said tape extending downwardly through openings 25 provided in the bottom wall of the head box, and slats 2B are carried in this ladder tape in the usual manner.
A sleeve member 2T-is rotatably mounted on the shaft l4 intermediate the spools l9, and sheaves 28 and 29 respectively, are mounted on said sleeve adjacent the ends thereof, said sheaves being disposed within the spool members l9, and metal lift tape members 30 are anchored thereto.
Circumferentially arranged, slotted openings 3| are provided in the 'cylindrical face of the spools l9 to accommodate said tape andpermit the tilting of the spools, said tape leading downwardly through the slats, the extreme end being anchored to the bottom rail 32 of the blind. Transversely disposed concave slots S are provided in the bottom rail 32 and a staple member U is also mounted in the rail in alignment with each slot, the staple projecting into said opening so that the end of the tape may be threaded therethrough and then secured by means of a metal clip X crimped around the loop of tape. This eliminates the possibility of breakage of the lifting tape at this point, and insures free tilting or swiveling of the bottom rail.
' A notched ratchet wheel 33 is rigidly mounted on the intermediate bracket l2 (see Fig. 4 of the drawings), and is centrally bored to accommodate the sleeve 21 which extends therethrough, a spool 34 being mounted on the sleeve directly adjacent said ratchet wheel, and a plurality of pawls 35 are mounted on said spool for engagement with the toothed ratchet member 33 as the blind is operated.
A spring element 36 is mounted on the sleeve 21 as shown, one end being anchored to the sheave 23, the opposite end of the spring being anchored to a non-rotatable floating bracket 31 which is slidable longitudinally on the sleeve 21; and it will be obvious that this floating bracket will move longitudinally in the head box as the blind is operated to wind and tension the spring.
A tilting mechanism '1 forms a part of the blind operating mechanism, and comprises a worm 38 journaled on the plate extension 39 which is mounted on the end bracket [3, said worm meshing with and driving the worm wheelthe hub of which is iournaled in the end bracket 13. A cord sheave I is provided'on the one end of the worm shaft II and a tilt cord 42 is trained thereover, the ends of the cord hanging down within easy reach of the blind operator so that the slats may be tilted to any desired angle.
I wish to direct particular attention to the length, as well as lessening spring friction and "snaking of the spring as the blind is drawn down.
In practice and when it is desired to lower the blind, the operator grasps the bottom rail 32 and exerts a downward pull thereon; downward travel of the blind unwinds the metal tape from the sheaves 28 and rotates the sleeve 21, winding and tensioning the spring element 36, the floating bracket3'l to which the spring is at-- tached, 'moving longitudinally a distance sufflcient to smoothly and evenly accommodate the spring, then when the blind has been lowered to desired position, one of the pawls 35 drops into the notch 43 of the ratchet member 33 and the mechanism will be held in set position, the several pawls permitting stopping of the blind in comparatively short steps.
To release, the operator again grasps the bottom rail of the blind, gives it a slight downward pull to release the engaged pawl from the notched portion 43 of the ratchet wheel 33 and the spring tension draws the blind upwardly until manually checked or in fully raised position, this operation being exactly the same as when raising a window shade.
I wish to direct particular attention to the fact that one shaft and sleeve construction makes a -very compact unit; it is operable to tilt, stop,
raise, or lower, and can be confined in a head box of limited height and depth.
It will, of course, be understood that the floating bracket can be of any desired design, and various changes and modifications may be made without departing from the spirit of the invention. I The mechanism is simple, practical, and economical; and all parts can be readily manufactured and assembled by comparatively unexperienced workmen.
What I claim is:
1. A Venetian blind provided with ladder tape, slats, a bottom rail, and lift tapes; a tilt shaft. a rotatable lift sleeve, sheaves mounted on said sleeve and about which the lift tapes are wound;
an energy storing spring element on said sleeve to lift said blind: a non-rotatable element, one
end of said spring element being connected to said sleeve with the opposite end connected to a shiftable non-rotatable element and automatic means to secure the blind against lifting movement.
2. A Venetian blind of the class described comprising a support, a longitudinally disposed shaft, a lift sleeve rotatably mounted thereon, sheaves mounted on said sleeve, lift-tape wound on the sheaves and connected to the bottom rail of the blind, a spring element anchored to the sleeve and to a non-rotatable element movable 101181- tudinally on said sleeve as the spring is tensioned, and automatic means to secure the blind against lifting movement. 3. A Venetian blind including a support, a shaft mounted to rock therein, a sleeve revolvably mounted on said shaft, sheaveson said sleeve and tapes wound thereon and connected to the bottom rail of the blind, a spring element mounted on said sleeve with one end anchored thereto, a nonrotatable bracket mounted to float on said sleeve and to which the opposite end of the spring is connected, and means to secure the blind against lifting movement.
4. A Venetian blind of the class described and comprising a support, a longitudinally disposed shaft mounted therein, a ladder tape supported from the shaft and including spaced slats and a bottom rail, a sleeve rotatable on said shaft, sheaves mounted on the sleeve, lifting tape connected to the bottom rail and adapted to be wound on said sheaves, a spring element mount-' ed on said sleeve to lift said blind, a stationary ratchet, and a pawl assembly mounted on said sleeve and automatically engageable and disengageable with said ratchet when the blind is operated.
5. A Venetian blind of the character described comprising a head box having a longitudinally disposed shaft mounted therein, tape drums fixed on said shaft and having ladder tape connected thereto, slats carried thereby and including a bottom rail, a sleeve revolvably mounted on said shaft intermediate the drums, sheaves on said sleeve, lifting-tape wound on said sheaves and connected to said bottomrail; a non-rotatable, longitudinally adjustable element mounted on said sleeve; a spring element also mounted on said sleeve and anchored to the sheave and nonrotatable element respectively, and automatically operable means for securing said blind against lifting movements.
. 6. A Venetian blind of the class described comprising a head box having a longitudinally disposed shaft rockably journaled therein, spaced apart drums mounted on said shaft, ladder tape anchored to the drums, slats mounted therein in spaced relation and including a bottom rafl, a sleeve on the shaft, sheaves mounted thereon, tapes anchored to and wound on said sheaves with the lower ends anchored to the bottom rail, a spring element anchored to one of said sheaves, means for non-rotatably anchoring the opposite end of said spring element, a locking ratchet, and a pawl assembly mounted on the sleeve and engageable with the ratchet for holding the blind in set position.
'7. In a Venetian blind wherein is provided a support with slats, ladder tape, and lift tape; a shaft, a rotatable sleeve mounted thereon; sheaves fixed on said sleeve and to which said lifting tape is connected, a non-rotatable floating brackat on the sleeve, a spring element anchored to said sleeve and bracket, respectively: a station- .ary ratchet; a pawl assembly rotatably molmted on said sleeve and overhanging said ratchet, one of said pawls being automatically engageable with said ratchet for holding the blind in set position. 1
8. A Venetian blind structure of the class described comprising a support, brackets secured thereto and a shaft mounted to rock therein,
' spaced apart spools on said shaft, ladder tape anchored thereto, slats ca'rried thereby and including a bottom rail, a sleeve on said shaft, sheaves on said sleeve, and lifting tape anchored I to and wound thereon with the lower ends secured to said bottom rail, a non-rotatable bracket I slidable on said sleeve, a stationary ratchet wheel, a revolvable pawl assembly mounted onthe sleeve der tape and including a bottom rail, a sleeve journaled on said shaft, sheaves mounted thereon within said drums, lift tape wound on said sheaves and connected to the bottom rail, a non-' rotatable floating bracket on the sleeve; a spring mounted on the sleeve and connected to one of the sheaves and to the bracket, respectively; a fixed ratchet wheel, and a pawl assembly on the sleeve and engageable with the ratchet wheel to hold the blind in set position.
. FRED J. BURNS.