But while doing this, keep it in mind to always use a flat-head screwdriver to pop the clutch of the blinds. No. Your email address will not be published. 9. In the preferred embodiment of FIGS. blind 38mm 32mm This lost motion is apparent upon beginning to raise the shade. FIG.
roller blind 38mm mechanism clutch spring china larger 7, but in which the two springs 73 and 75 are molded as a part of rotating element 77. contral s4 To prevent such expansion of spring portion 93, shaft portion 87 of fixed housing 79 has shoulder 101 whose inside diameter is slightly smaller than the inside diameter of spring portion 93. 5, cut-away to show the spring; FIG. 38mm 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. 
4,009,745. The clutch based devices are operated with cord loops that hang from one end of the shade roller. Spring 55 has one end formed into radially extending tail 57. Roller blinds consist of a little pin on the opposite side of the cord. An additional object of our invention is to provide a clutch controlled roller shade mechanism that does not exhibit a surging or oscillatory motion while being lowered. Rotating pulley element 17 is generally comprised of three portions, pulley 23, sleeve 25, and spring 27. 5 is a perspective view of another embodiment of the invention; FIG. 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. & Terms of Use. No. 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. roller blind accessory spring mechanism larger Detach the blinds from the wall and pull out the clutch (the part with the chain). Therefore, the range of weights that such a mechanism would be expected to support can be rather limited. 5 shows the assembled clutch of this second embodiment of the invention. Another embodiment shows the application of our invention to installations in which the mounting is to a board or a headrail. 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. Firstly, pull the clutch back into the blinds and hang them on the wall. 3 is another perspective view of the same clutch showing the opposite face of the clutch, together with its bracket and cord loop; FIG. It is objectionable to have more friction than is needed. This deformation provides sufficient frictional contact between the roller and the clutch to permit the shade to be rolled onto the tube without slippage. 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. clutch roller mechanism blinds customized middle larger This introduction of an additional component part does tend to increase cost, but it simplifies the plastic molds and allows greater adaptability to differing performance requirements. As can be seen in FIG. The preferred embodiment uses only two parts, both of which can be molded. 4,623,012 discloses a mechanism for the operation of the latter type of blind. It also permits the shade to be operated from one end rather than from the center which can be difficult to reach if the window is behind a piece of furniture. roller clutch blind shade mechanism parts types sidewinder 28mm 25mm supplier wholesale larger 32mm It is to be expected that larger and non-standard window sizes would continue to be fitted with prior art clutches. These devices apply a fixed torque to resist rotation of the shade roller no matter which direction the roller is turned. 
2-4, this corresponds to separating spring 27 from the rest of rotating pulley element 17. 
4,323,105, 4,223,714, and 4,094,904. With our inventive clutch mechanism, it is possible to lower the shade by pulling directly on the shade itself without damaging the mechanism. 3,135,369, 4,372,432, 4,433,765 and U.S. patent application Ser. Sleeve 25 of rotating pulley element 17 is formed so as to fit irrotatably into roller 3. In the direction for lowering the shade, the clutch requires that a high torque be applied for slippage to occur. 
It will thus be seen that the objects set forth above among those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the construction of the inventive spring clutch without departing from the spirit and scope of the invention, 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. 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. In the case of roller shades, it is usually the central element of the clutch that is fixedly mounted to a wall or ceiling. 
FIG. Spring 27 of rotating pulley element 17 must have an inside diameter that is slightly smaller than the outside diameter of cylindrical extension 21 of fixed housing element 15. 
However, this embodiment provides the advantage that the characteristics of spring 55 can be easily modified to accommodate a wide range of shade sizes and weights. 
Since our clutch mechanism is likely to find its major application in mass produced, prefabricated shades, this consideration is not really a limitation at all. Shroud portion 19 of fixed housing element 15 has bearing sleeve 29, best seen in FIG. 995,422. The brackets and the pivoting assembly depicted are made according to U.S. Pat.
Prior art clutch mechanisms overcome some of the disadvantages of ratchet and pawl devices, but they have some disadvantages of their own. unoversal This is an advantage in public buildings where shades are operated by those unfamiliar with cord operation. The shade is operated by a cord loop which passes over a pulley in the device. Nos. 
This permits the shade to be raised. As mentioned above, the clutch mechanism provides a significant advantage over symmetric friction brake devices because, in those devices, the friction must also be overcome when raising the shade, whereas, the clutch of our invention releases when raising the shade so that the force required is only slightly greater than the weight of the shade. Shroud portion 83 covers the pulley and, in the particular part shown, provides exit slots in both the front and back for the operating cord loop which is not shown. 
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. 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. Take the chain from the bottom of the roller, bring both ends together, and then fit the connector into it to shut the blinds. 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. So, it may be necessary to re-position them appropriately and timely. Other objects and advantages of our invention will become apparent from the descriptions that follow. blinds clutch roller blind spring chain mechanism shangri 38mm cassette larger The height of the shade is adjusted by pulling on one or the other side of cord loop 13. Privacy Policy 
Most of the time, the clutch is broken so it should be replaced as soon as possible. Therefore, it can be less expensive to produce. 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. As well, if you are uncomfortable on your own, look for the help of a professional. When cord 13 is no longer pulled, clutch assembly 5 again holds shade 1 in position. This clutch mechanism is designed to release for raising the shade so as to minimize effort. 9 has only two component parts. The shade will remain at the selected position with no further action required of the operator. What Are Valance Returns and Do You Need Them? 
When cord loop 13 is pulled so as to produce clockwise motion of roller 3, as seen from the clutch end in FIG. Brackets 9 and 11 support the shade and roller assembly. 
Ratchet and pawl mechanisms are often difficult to engage and can only be set at heights corresponding to the tooth spacing of the ratchet. In this situation, one can replace the whole chain of the blind. 6, the clutch assembly includes cylindrical extension 45 of fixed element 41. This mounting is also convenient where a wooden or aluminum headboard is employed. This facilitates the mounting of the clutch to a headrail, such as is commonly used with Venetian blinds. Tension in the operating cord, in the direction which winds the shade onto its roller, loosens the helical spring and reduces its frictional hold on the tubular portion of the housing. The clutch of our invention requires prior determination of the direction in which the shade is to be wound onto the roller. To lower the shade, the opposite side of cord loop 13 is pulled. It also is essentially devoid of lost motion which makes it more aesthetically pleasing to operate. Save my name, email, and website in this browser for the next time I comment. FIGS. The solution to the problem lies in the thorough cleaning of the pawl and lubricant application to the rotating part of the blinds. However, bi-directional clutch devices contain a larger number of parts which makes them more expensive to manufacture. For the clutch shown in FIG. Shaft portion 87 extends axially from bearing and mounting portion 85 of fixed housing 79. Another advantage is discussed in U.S. patent application Ser. No. Required fields are marked *. contral The device is, in effect, an overrunning spring clutch that is designed to slip in either direction, but at different values of applied torque.
All rights reserved. 
Shade material 1 is partially wound around roller 3. Another object of our invention is to provide a roller shade mechanism with minimal lost motion. 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. Copyright ZebraBlinds.com.
An alternative embodiment for the same use and of the same general configuration uses discrete wire springs. 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. 2004-2022 FreePatentsOnline.com. The device of our invention contains fewer parts than the clutches of the prior art. The two spring arrangement of the clutch of FIG. 
Spring 55 is formed in a closely wound cylindrical helix to fit snugly about cylindrical extension 45. 7, but made from two molded parts. However, this mounting arrangement is often inconvenient. However, sometimes, roller blinds can function in an irregular manner when they develop malfunction in their clutch. Most prefabricated, mass produced shades are made of rather light shade material and they are made for the most popular and standard window sizes. roller contral mechanism The rotational direction in which resistance is produced depends upon the direction in which the helix of spring 27 is formed. However, the more complex and more expensive clutch mechanisms also come in various sizes to accommodate shade of differing weights. The clutch is held together by barbs 47 which are molded as a part of fixed element 41 and which protrude through hole 49 located at the end of rotating element 35. 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. 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. roller Also, the lost motion can contribute to an oscillating, or surging motion while the shade is lowered. And, of course, the rotational direction can be more easily altered. 4,433,765, that each of the spring can have fewer turns which provides for smoother operating characteristics. If such a thing happens then take the cap off to uncover the pin and tighten it by using a plier or replace the cap. This mechanism has been in use for many years, but it is notoriously unpopular among users. 
9 discloses an embodiment of the inventive clutch in which the stationary element is the exterior one. Spring 55 acts in the same way as spring 27 of the preferred embodiment. 5-8 can, as well, be incorporated into the general design depicted in FIG. Easy to use and maintain cordless roller shades. The preferred embodiment of our invention consists of only two parts, a pulley and a housing, both of which can be produced by injection molding of plastic. Criticisms include the necessity of handling the shade material in order to operate the shade, and unreliable operation. roller blind accessory curtain 28mm clutch shade mechanism shutter components parts larger blind roller 38mm mechanism curtain shade accessories clutch shades chain manual ball 4sets package tube In this embodiment, two springs 59 and 61 are employed. contral 5 and 6, although this is clearly not a requirement. Our invention provides a mechanism that is similar in many respects to a clutch device in that it is operated by means of a cord loop which hangs from one end of the shade roller. It occurs when brackets are placed too far from one another. Some prior art clutches offer the advantage that they can operate in either direction of rotation. 4 is a perspective view of the clutch, similar to the view of FIG. 1, but from a different angle, and with one half of the clutch cut away; FIG. Neither of these last mentioned items are a part of our invention. These blinds are easy to install and give a stylish and elegant look to your house especially with a dark and deep shade. 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. You must know it in detail so that the blinds can work properly and give an extraordinary, imperial look to your living place. One thing that you should be keeping mind is to trim the new cord according to the size of the blinds. No. Rotation of the pulley teeth: Keep rotating the pulley until the tip of the chain reaches the left side of the guard and then put the chain in right place. The resistance provided by clutch assembly 5 to that rotation holds the shade in position. 995,422. Referring now to FIG. Like the preferred embodiment of our invention, the embodiment of FIG. blind mechanism roller clutch manual larger 5,228,491 reveals an example of the former, and U.S. Pat. Fixed element 41 includes shroud portion 43 which covers pulley 39 and retains the cord or chain. In the present example, the clutch must provide sufficient resistance to clockwise movement to support the weight of the shade material and yet not so much resistance as to make lowering of the shade too difficult. The prior art mechanism most commonly used for controlling the vertical position of a roller window shade is the ratchet and pawl mechanism, a recent example of which is shown in U.S. Pat. 1, shade material 1 will be elevated. When that force exceeds the holding capability of clutch 5, the clutch slips, permitting the shade to be lowered. This permits the external, rotating element to be fitted into the shade roller, as exemplified by the embodiments above described. Rotating element 35 is comprised of cylindrical sleeve 37 which is configured to fit into a shade roller, and pulley 39 adapted to receive the operating cord or chain. Keeping the spring as a separate part allows the clutch more easily to suit a variety of shade sizes and weights. 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. 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. FIG. 
This method is appropriate for the blinds which have ball and chain styles of cords. ZebraBlinds takes no liability for any issues or damaged caused through following DIY methods. 1 shows a mounted shade and roller assembly. 43mm The prior art also contains examples of clutch mechanisms that are adapted for the operation of roller shades. On the other hand, many prior art clutches require a substantial movement of the pulley before the shade begins to move. The clutch can be adapted easily to accommodate know shade weights. 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. Further understanding of our invention will become apparent upon consideration of the following detailed description in conjunction with the drawings, in which: FIG. This increases the force tending to rotate element 17 in the counter-clockwise direction. In fact, to rule out any difficulty, cleaning should be done very carefully. In FIG. These devices suffer from the disadvantage that a substantial force is needed to raise the shade. 2-4 depict the preferred embodiment of our inventive clutch. As shown in FIG. 6 is a perspective view of the clutch of FIG. 9 is a partially cut-away, perspective view of an alternative embodiment of the inventive clutch configured for mounting by the outside element rather than the inside element. Outer rim 30 of shroud portion 19 is formed so as to keep cord loop 13 in engagement with the pulley teeth and to act as a cover and guide for the cord. (NEW YORK, NY, US), Click for automatic bibliography Therefore, friction devices are usually made to be adjustable in the field.
The prior art does contain examples of other wrap spring clutch mechanisms used to operate roller shades. Press the chain with full force until the position of the pulley fits into the 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. 8 is a perspective view of a clutch similar to the embodiment of FIG. Fixed housing element 15 is generally comprised of shroud portion 19 and cylindrical extension 21. mechanism Such installations are appropriate to Venetian blinds, or balloon shades that are raised by cords that lift the shade from the bottom. In elevating the shade, it is, of course, necessary for the operator to apply all of the torque needed to raise the shade. 7 shows another embodiment of our invention. This rotation tends to unwind spring 27 and loosen its grip on cylindrical extension 21 of fixed housing element 15. When the shade is stationary, the torque due to the weight of the shade material hanging from the roller tends to tighten the helical spring about the tubular core to hold the shade in place. To restore the correct working of blinds, it is necessary for you to know the way of fixing roller blind clutch. An alternative embodiment of our invention can advantageously be constructed by separating the spring portion from the remainder of rotating element. 
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. By pushing the pin, it will release the blinds and allow you to pull them off of the mount. roller mechanism blinds clutch plastic blind larger In order for the pulley to rotate in the other, counter-clockwise direction, it is necessary for that sufficient torque be applied through the operating cord to the pulley to overcome the holding capability of the clutch and cause it to slip. 38mm mechanisme blinde rolgordijn roller shade clutch mechanisms blindparts parts clutches roller alibaba mechanism clutch blinds website larger blind Counter-clockwise rotation tends to tighten the grip of spring 27 about cylindrical extension 21.
A cover, which is not shown, snaps over the open face of shroud portion 83 to keep the clutch together. This requires expensive field service. After assembly, sleeve 37 and spring 55 rotate together, as one piece. s6 contral mechanism blind roller mechanism china clutch duty heavy larger All rights reserved. Those with expertise in the art of spring clutch design will realize that, among the parameters that can be adjusted are, the grip of spring 55 on cylindrical extension 45, the number of turns of spring 55, and the size of the wire of which spring 55 is wound. 9, rib 95 is visible, and ribs 97 and 99 are partially visible, having been cut away to show the interior of the clutch. roller duty heavy blind 38mm clutch spring larger mechanism clutch curtain window factory china roller mechanism blind larger FIG. blinds
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