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Fixed element 41 includes shroud portion 43 which covers pulley 39 and retains the cord or chain. The inventive design provides superior operating characteristics and, because the clutch can be built with as few as two parts, much lower cost. Each of the two parts, fixed housing element 15 and rotating pulley element 17, can be formed in a single piece which can be injection molded using a plastic material or die cast using a metal such as zinc. The important factors are the number of coils in the spring, the amount by which the spring must expand to fit over the cylindrical extension, the thickness, the width and the bending characteristics of the spring coils, and the coefficient of friction between the spring and the cylindrical extension. In the preferred embodiment, this is accomplished by a number of small ribs 33 which slightly deform roller 3 upon insertion. 5, cut-away to show the spring; FIG. Embodiments are disclosed which are configured for use in roller shades and for other types of window coverings. This is the rotational direction, as explained above, in which clutch assembly 5 releases and provides little resistance to rotation. contral Rotate the pulley and grip the chain up to the extent that the chain comes out of the right side of the guard, and then pull down with both the ends dangling out of the clutch. It also is essentially devoid of lost motion which makes it more aesthetically pleasing to operate. For the clutch shown in FIG.

One can also tackle the problem related to the brackets positioning. Quite often blinds get stuck while rolling up. contral s4 The preferred embodiment uses only two parts, both of which can be molded. Referring now to FIG. No additional manufacturing operations are required except for the very simple assembly operation of fitting the two parts together. 8 shows a clutch assembly with the same operating algorithm as the clutch of FIG. The brackets and the pivoting assembly depicted are made according to U.S. Pat. Those who are expert in the art of wrap spring clutches will be familiar with the methods and techniques required. It is also to be understood that the following claims are 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. This lost motion is apparent upon beginning to raise the shade. Shaft portion 87 extends axially from bearing and mounting portion 85 of fixed housing 79. Further understanding of our invention will become apparent upon consideration of the following detailed description in conjunction with the drawings, in which: FIG. Sleeve 25 of rotating pulley element 17 is formed so as to fit irrotatably into roller 3. Spring 55 has one end formed into radially extending tail 57. In the downward direction, additional force is needed to overcome the holding torque of the clutch, but the weight of the shade contributes some amount of that force, depending on the amount of the shade that is unrolled, so that the total pull on the operating cord is always less than the holding torque of the clutch. Whereas prior art clutch mechanisms for roller shades are intended not to slip, or to slip only to save themselves, in this case, lowering of the shade is accomplished by overriding the clutch, causing it to slip. Accordingly, it is an object of our invention to provide a mechanism for the operation of roller window shades that has the advantages of cord loop operation but is less expensive to manufacture than the similarly operated mechanisms of the prior art. The fixed and the rotating elements form a wrap spring clutch that is configured to slip in one direction almost without resistance, and to provide moderate resistance to slippage in the other direction. So, it may be necessary to re-position them appropriately and timely. The device of our invention contains fewer parts than the clutches of the prior art. It is to be expected that larger and non-standard window sizes would continue to be fitted with prior art clutches. Another object of our invention is to provide a roller shade mechanism with minimal lost motion. The clutch is assembled by inserting rotating pulley element 81 into fixed housing 79. Since all blinds and shades are different, we always recommend checking with your blind manufacturer or retailer first before making any modifications to your blinds. 4,009,745. ZebraBlinds takes no liability for any issues or damaged caused through following DIY methods. Another embodiment shows the application of our invention to installations in which the mounting is to a board or a headrail. roller blind accessory spring mechanism larger FIGS. Rotating pulley element 17 is generally comprised of three portions, pulley 23, sleeve 25, and spring 27. By pushing the pin, it will release the blinds and allow you to pull them off of the mount. However, none of the prior art devices is comprised of only two component parts. blinds However, sometimes, roller blinds can function in an irregular manner when they develop malfunction in their clutch.

Such installations are appropriate to Venetian blinds, or balloon shades that are raised by cords that lift the shade from the bottom. roller FIG. A cover, which is not shown, snaps over the open face of shroud portion 83 to keep the clutch together. 1 shows a mounted shade and roller assembly. Spring 55 is formed in a closely wound cylindrical helix to fit snugly about cylindrical extension 45. However, it is not necessary for the operator to apply all of the torque needed to force the clutch to slip when lowering the shade, because the weight of the depending portion of the shade itself exerts a torque in that same direction. Brackets 9 and 11 support the shade and roller assembly. 8 is a perspective view of a clutch similar to the embodiment of FIG. roller blind 38mm mechanism clutch spring china larger The cord loop eliminates the need for handling of the shade material or a protective shield attached thereto, and the clutch mechanism allows the height of the shade to be precisely set. In elevating the shade, it is, of course, necessary for the operator to apply all of the torque needed to raise the shade. Generally, fixed housing 79 is comprised of shroud portion 83, bearing and mounting portion 85, and shaft portion 87, while rotating pulley element 81 is comprised of pulley portion 89, bearing portion 91, and spring portion 93. Nos. This clutch mechanism is designed to release for raising the shade so as to minimize effort. Other prior art devices for controlling window shades include friction brakes as exemplified by U.S. Pat. Press the chain with full force until the position of the pulley fits into the place. Pivoting assembly 7 is inserted into the opposite end of roller 3. In a typical installation, the opposite end of the window shade roller would be affixed to a suitable pin or gudgeon arrangement which would be mounted to its own bracket. Among these are U.S. Pat. 1, but from a different angle, and with one half of the clutch cut away; FIG. CUSTOM DRAPERY VALANCES AND CORNICE BOARDS, How To Put The Chain Back On A Roller Blind, How to Choose the Right Custom Roller Shades for Your Needs, The Best Color Combinations You Can Use in Blinds, Top Reasons Why Cellular Shades Are Still A Popular Home Decoration Option. You must know it in detail so that the blinds can work properly and give an extraordinary, imperial look to your living place. As with the previously described embodiments, rotating the pulley in one direction releases the grip of spring portion 93 of rotating pulley element 81 on shaft portion 87 of fixed housing 79, permitting easy movement in that direction. Most of the time, the clutch is broken so it should be replaced as soon as possible. Required fields are marked *. According to your need and design of your room, pop out or open the connector from one of the side ends and then pull the chain out to fix the problem of the blinds. No. And, of course, the rotational direction can be more easily altered. After it is done, you can pop the clutch off. And, as before, the weight of the shade contributes to this torque. a fixed housing element including an extending shaft; a rotating pulley element comprising a pulley member rotatably mounted to said housing element and adapted to receive therealong an operating cord or chain; at least one helically wound axially mounted spring which makes a frictional braking contact with said shaft and having one end thereof irrotatably affixed to said rotating pulley element. Another limitation inherent in the design of our inventive clutch is that the approximate weight of the shade determines the design of the clutch spring. Clutch assembly 5 is inserted into the one end of roller 3 and is prevented from slipping by the friction of a tight fit, or by contact between some feature on the inside of roller 3 and the outside of the sleeve portion of the pulley that fits therein, as described later. 5,228,491 reveals an example of the former, and U.S. Pat.

The characteristics of the clutch should be chosen so that it will slip at a torque somewhat greater than the highest torque that can be realized from the weight of the largest shade to be used. (NEW YORK, NY, US), Click for automatic bibliography However, clutch devices tend to be somewhat more expensive than the ratchet and pawl devices, and they require some amount of lost motion to insure proper operation. roller clutch blind shade mechanism parts types sidewinder 28mm 25mm supplier wholesale larger 32mm clutch roller mechanism blinds customized middle larger Keeping the spring as a separate part allows the clutch more easily to suit a variety of shade sizes and weights. During assembly, as rotating element 35 is fitted over cylindrical extension 45, slot 53 is aligned with tail 57 and they fit together with minimal clearance. As shown in FIG. Ratchet and pawl mechanisms are often difficult to engage and can only be set at heights corresponding to the tooth spacing of the ratchet. It is objectionable to have more friction than is needed. 2004-2022 FreePatentsOnline.com. Firstly, pull the clutch back into the blinds and hang them on the wall. To lower the shade, the operator pulls on the cord, in the direction that further tightens the helical spring about the tubular portion of the housing, with sufficient force to overcome the holding torque provided by the helical spring. Hold the clutch in such a manner that barrel faces upwards and the base faces downwards of the blinds and slide the chain from the left side of the guard. When someone pulls the chain of custom roller blinds in the up or down position for raising or lowering the blinds, it can disturb the spring tension and makes it hard to move the blind. This has the advantage of only two component parts, but lacks the adaptability of the version with separate wire springs. clutch curtain window factory china roller larger mechanism blind In the preferred embodiment of FIGS. No. An alternative embodiment for the same use and of the same general configuration uses discrete wire springs. blind roller mechanism china clutch duty heavy larger roller No. roller shade clutch mechanisms blindparts parts clutches The resistance provided by clutch assembly 5 to that rotation holds the shade in position. 6, the clutch assembly includes cylindrical extension 45 of fixed element 41. This document discloses a method of using two springs in a balanced configuration to eliminate bearing loads that otherwise occur in spring clutches of this configuration. Spring 55 acts in the same way as spring 27 of the preferred embodiment. 2-4 depict the preferred embodiment of our inventive clutch. A further object of our invention is to provide a roller shade mechanism that requires less lifting force than the friction brakes of the prior art. An advantage inherent in the design of our clutch is the absence of lost motion. The need to predetermine the direction of winding, together with the potential for low manufacturing cost, make this invention an ideal clutch mechanism for prefabricated shades. What Are Valance Returns and Do You Need Them? Privacy Policy A further disadvantage of friction brake mechanisms is that they require a substantial number of component parts, usually including friction pads, a spring, and an adjustment screw. One thing that you should be keeping mind is to trim the new cord according to the size of the blinds. Here are some points to remember while taking care of custom roller blinds: By following the above-mentioned steps, you can sort out the problem of fixing a roller window blind clutch. Therefore, when raising the shade, the operator must, at the very least, provide a force equal to twice the weight of the shade, since the weight must be lifted and the brake force must be overcome. Fixed housing element 15 is generally comprised of shroud portion 19 and cylindrical extension 21. As well, if you are uncomfortable on your own, look for the help of a professional. If the sleeve were to have a circular outside shape, then any variation in the size of either part would cause the fit to be too loose or too tight.

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ed element 41 includes shroud po