Rotating pulley element 17 is generally comprised of three portions, pulley 23, sleeve 25, and spring 27. 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. The brackets and the pivoting assembly depicted are made according to U.S. Pat. How to Automate My Home Getting Started with Smart Homes. This is the rotational direction, as explained above, in which clutch assembly 5 releases and provides little resistance to rotation. Dont stress about broken chains or clutches again. 995,422. 4 is a perspective view of the clutch, similar to the view of FIG. Shade material 1 is partially wound around roller 3. 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.
Our inventive mechanism provides a holding torque sufficient to support the shade at any elevation. Spring 55 is formed in a closely wound cylindrical helix to fit snugly about cylindrical extension 45. roller blind accessory curtain 28mm clutch shade mechanism shutter components parts larger 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. 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. No. The prior art does contain examples of other wrap spring clutch mechanisms used to operate roller shades. generation, Spring clutch assembly with reduced radial bearing forces, Structure of cloth curtain lift controller, Apparatus for opening and closing a window shade or the like, Screen-operating device for use in a roller blind, <- Previous Patent (Guide system for ver).
FIG. Referring now to FIG. Further understanding of our invention will become apparent upon consideration of the following detailed description in conjunction with the drawings, in which: FIG. 4,009,745.
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. This clutch mechanism is designed to release for raising the shade so as to minimize effort. The pulley has an extension which fits tightly into a hole in the end of the shade roller, and a further extension in the form of a helical coil spring which fits snugly about a tubular portion of the housing. 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. Nos.
6, rotating element 35 has two slots, 51 and 53, axially oriented on opposite sides of the outer walls of sleeve 37. 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.
The clutch is assembled by inserting rotating pulley element 81 into fixed housing 79.
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.
blind roller mechanism china clutch duty heavy larger FIG. 43mm 9, rib 95 is visible, and ribs 97 and 99 are partially visible, having been cut away to show the interior of the clutch.
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. 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. As shown in FIG.
4, about which pulley 23 is piloted. This increases the force tending to rotate element 17 in the counter-clockwise direction. Another embodiment shows the application of our invention to installations in which the mounting is to a board or a headrail. Privacy Policy FIG. When the fixed and rotating elements are assembled, spring 27 must be slightly expanded to fit over cylindrical extension 21. 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. Fixed housing element 15 is generally comprised of shroud portion 19 and cylindrical extension 21. 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. Roller blinds consist of a little pin on the opposite side of the cord.
Bearing and shaft portion 85 has four mounting ribs for positioning in a roll formed Venetian blind headrail.
blind roller 38mm mechanism curtain shade accessories clutch shades chain manual ball 4sets package tube In the preferred embodiment of FIGS. An advantage inherent in the design of our clutch is the absence of lost motion. As can be seen in FIG. Keeping the spring as a separate part allows the clutch more easily to suit a variety of shade sizes and weights. 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.
2-4 depict the preferred embodiment of our inventive clutch. roller mechanism blinds clutch plastic blind larger
In the preferred embodiment, this is accomplished by a number of small ribs 33 which slightly deform roller 3 upon insertion. 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. Other prior art devices for controlling window shades include friction brakes as exemplified by U.S. Pat. This deformation provides sufficient frictional contact between the roller and the clutch to permit the shade to be rolled onto the tube without slippage. In the direction for raising the shade, the overrunning clutch slips at a low torque because the spring tends to unwind. 2004-2022 FreePatentsOnline.com. No. Shroud portion 19 of fixed housing element 15 has bearing sleeve 29, best seen in FIG. 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. FIG. 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.
No. This is an advantage in public buildings where shades are operated by those unfamiliar with cord operation. And, as before, the weight of the shade contributes to this torque. No. All rights reserved. The friction brake must provide a force no less than the weight of the shade that is to be supported.
blind 38mm blinds clutch roller blind spring chain mechanism shangri 38mm cassette larger 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. Firstly, pull the clutch back into the blinds and hang them on the wall. Again as before, the clutch must be designed so that this torque can be easily provided by the operator of the shade. 6 is a perspective view of the clutch of FIG. These blinds are easy to install and give a stylish and elegant look to your house especially with a dark and deep shade. FIGS. The shade is operated by a cord loop which passes over a pulley in the device. Disclaimer: Please follow these instructions at your own risk. On the other hand, many prior art clutches require a substantial movement of the pulley before the shade begins to move. Ratchet and pawl mechanisms are often difficult to engage and can only be set at heights corresponding to the tooth spacing of the ratchet. Your email address will not be published.
An alternative embodiment for the same use and of the same general configuration uses discrete wire springs. Sleeve 25 of rotating pulley element 17 is formed so as to fit irrotatably into roller 3. roller roller duty heavy blind 38mm clutch spring larger mechanism The controlling torque of the clutch is transmitted to the mechanism for lifting the blind by a rod or shaft axially affixed to the central element. By pushing the pin, it will release the blinds and allow you to pull them off of the mount. 7, but in which the two springs 73 and 75 are molded as a part of rotating element 77. Save my name, email, and website in this browser for the next time I comment.
Most of the time, the clutch is broken so it should be replaced as soon as possible. Press the chain with full force until the position of the pulley fits into the place. These devices apply a fixed torque to resist rotation of the shade roller no matter which direction the roller is turned. 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. 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. This permits the shade to be raised. When that force exceeds the holding capability of clutch 5, the clutch slips, permitting the shade to be lowered. 5-8 can, as well, be incorporated into the general design depicted in FIG. However, friction brakes are quite variable, depending upon heat, humidity, wear, and even the length of time that the shade has been in position. In fact, to rule out any difficulty, cleaning should be done very carefully.
5, cut-away to show the spring; FIG. When cord 13 is no longer pulled, clutch assembly 5 again holds shade 1 in position. When the cord is first pulled, some motion is required before the shade begins to move. As shown, the clutch assembly uses the same molded parts as are used in the embodiment of FIGS. (NEW YORK, NY, US), Click for automatic bibliography The rotational direction in which resistance is produced depends upon the direction in which the helix of spring 27 is formed.
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. The resistance provided by clutch assembly 5 to that rotation holds the shade in position.
ZebraBlinds takes no liability for any issues or damaged caused through following DIY methods.
However, this mounting arrangement is often inconvenient. roller contral mechanism Like the preferred embodiment of our invention, the embodiment of FIG. 6, the clutch assembly includes cylindrical extension 45 of fixed element 41. The device contains a means for receiving a wall or ceiling mounted window shade bracket. Brackets 9 and 11 support the shade and roller assembly. No. 4,729,418, but many other types would also be usable. 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. The prior art also contains examples of clutch mechanisms that are adapted for the operation of roller shades.
It is characteristic of spring clutches, having helical springs radially confined within a cylinder, that the springs tend to expand in the axial direction when loaded. Many a time, problems crop up due to the small parts of the blinds which we generally dont think about. 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. 9. 9 has only two component parts. It is to be expected that larger and non-standard window sizes would continue to be fitted with prior art clutches. 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. Required fields are marked *. 8 shows a clutch assembly with the same operating algorithm as the clutch of FIG.
Spring 55 acts in the same way as spring 27 of the preferred embodiment. No. 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. 3,135,369, 4,372,432, 4,433,765 and U.S. patent application Ser. General Clutch Corporation (Stamford, CT), 160/291, 160/298, 160/307, 160/308, 160/319, 160/321, 160/323.1, 192/8C, 192/81C, 192/41S, GOTTLIEB, RACKMAN & REISMAN, P.C. Quite often blinds get stuck while rolling up. Another reason is that plastic beads break off from the chain.
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.
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. Prior art clutch mechanisms overcome some of the disadvantages of ratchet and pawl devices, but they have some disadvantages of their own. Shaft portion 87 extends axially from bearing and mounting portion 85 of fixed housing 79. 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. In this embodiment, the clutch assembly is comprised of two parts, fixed housing element 15 and rotating pulley element 17. 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. A cover, which is not shown, snaps over the open face of shroud portion 83 to keep the clutch together. One can also tackle the problem related to the brackets positioning. 5 is a perspective view of another embodiment of the invention; FIG. To lower the shade, the opposite side of cord loop 13 is pulled. One thing that you should be keeping mind is to trim the new cord according to the size of the blinds. When cord loop 13 is released, the weight of shade material 1 that is hanging from roller 3 produces a force that tends to rotate roller 3 in a counter-clockwise direction as seen from the clutch end. It is a significant advantage of the invention that the clutch releases for motion in the upward direction, so that little additional force is needed beyond that necessary to overcome the weight of the shade itself. 7 is a perspective, partially cut-away view of a third embodiment of our inventive clutch that employs two springs; and.
Helical spring 27, as seen in FIG. blinds This mechanism has been in use for many years, but it is notoriously unpopular among users. 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. Since these shades are made to order, they are more expensive and can bear the additional cost of more expensive hardware. 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. In the direction for lowering the shade, the clutch requires that a high torque be applied for slippage to occur. In its preferred embodiment, it can advantageously be used to raise and lower window shades.
Accordingly, FIG. This lost motion is apparent upon beginning to raise the shade. mechanism clutch curtain window factory china roller larger mechanism blind 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. Your email address will not be published. The shade will remain at the selected position with no further action required of the operator.
Nos.
After assembly, sleeve 37 and spring 55 rotate together, as one piece. Other objects and advantages of our invention will become apparent from the descriptions that follow. 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. It is with the cylindrical inside surface of shaft portion 87 which spring portion 93 of rotating pulley element 81 makes contact to produce the clutching action.
5,228,491 reveals an example of the former, and U.S. Pat. For the clutch shown in FIG. The preferred embodiment uses only two parts, both of which can be molded. The solution to the problem lies in the thorough cleaning of the pawl and lubricant application to the rotating part of the blinds. roller clutch blind shade mechanism parts types sidewinder 28mm 25mm supplier wholesale larger 32mm 32mm 1, shade material 1 will be elevated. clutch roller mechanism blinds customized middle larger 9, The two component parts of the clutch are fixed housing 79 and rotating pulley element 81.
Criticisms include the necessity of handling the shade material in order to operate the shade, and unreliable operation. Roller blinds are considered to be the simplest way to transform a room and provide the perfect solution for the windows of your house. So, it may be necessary to re-position them appropriately and timely. The device is, in effect, an overrunning spring clutch that is designed to slip in either direction, but at different values of applied torque. Counter-clockwise rotation tends to tighten the grip of spring 27 about cylindrical extension 21. FIG. Also, the lost motion can contribute to an oscillating, or surging motion while the shade is lowered. This method is appropriate for the blinds which have ball and chain styles of cords.
This invention relates to roller systems for window shades, screens, hanging lamps and the like. With our inventive clutch mechanism, it is possible to lower the shade by pulling directly on the shade itself without damaging the mechanism. A spring clutch mechanism for the operation of roller shades and other rollable items.
FIG. As well, if you are uncomfortable on your own, look for the help of a professional. roller alibaba mechanism clutch blinds website larger blind unoversal roller The height of the shade is adjusted by pulling on one or the other side of cord loop 13. & Terms of Use. Those who are expert in the art of wrap spring clutches will be familiar with the methods and techniques required. roller blind accessory spring mechanism larger This facilitates the mounting of the clutch to a headrail, such as is commonly used with Venetian blinds.
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