ed element 41 includes shroud po

2022.07.31
why does my kitten chew on everything

ed element 41 includes shroud po

Fixed element 41 includes shroud portion 43 which covers pulley 39 and retains the cord or chain. It also is essentially devoid of lost motion which makes it more aesthetically pleasing to operate. But while doing this, keep it in mind to always use a flat-head screwdriver to pop the clutch of the blinds. One thing that you should be keeping mind is to trim the new cord according to the size of the blinds. Care is needed in the design of spring 27 and cylindrical extension 21. Again as before, the clutch must be designed so that this torque can be easily provided by the operator of the shade. 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. In the preferred embodiment of FIGS. The device of our invention contains fewer parts than the clutches of the prior art. blind 38mm Easy to use and maintain cordless roller shades. Copyright ZebraBlinds.com. 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. 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. The device is, in effect, an overrunning spring clutch that is designed to slip in either direction, but at different values of applied torque. 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.

This lost motion is apparent upon beginning to raise the shade.

However, the more complex and more expensive clutch mechanisms also come in various sizes to accommodate shade of differing weights. roller blind 38mm mechanism clutch spring china larger When cord loop 13 is pulled so as to produce clockwise motion of roller 3, as seen from the clutch end in FIG. When the fixed and rotating elements are assembled, spring 27 must be slightly expanded to fit over cylindrical extension 21. In this embodiment, the clutch assembly is comprised of two parts, fixed housing element 15 and rotating pulley element 17. The preferred embodiment uses only two parts, both of which can be molded. No. 2004-2022 FreePatentsOnline.com.

Also, the lost motion can contribute to an oscillating, or surging motion while the shade is lowered. However, this mounting arrangement is often inconvenient. 3 is another perspective view of the same clutch showing the opposite face of the clutch, together with its bracket and cord loop; FIG. This clutch mechanism is designed to release for raising the shade so as to minimize effort. Detach the blinds from the wall and pull out the clutch (the part with the chain). 995,422.

Another reason is that plastic beads break off from the chain. Since these shades are made to order, they are more expensive and can bear the additional cost of more expensive hardware. 7 is a perspective, partially cut-away view of a third embodiment of our inventive clutch that employs two springs; and. It is an additional advantage of this inventive clutch that each of the two component parts can be die cast or injection molded. However, sometimes, roller blinds can function in an irregular manner when they develop malfunction in their clutch. 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. Required fields are marked *. 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.

Therefore, it can be less expensive to produce. Criticisms include the necessity of handling the shade material in order to operate the shade, and unreliable operation. This is the rotational direction, as explained above, in which clutch assembly 5 releases and provides little resistance to rotation. Roller blinds are considered to be the simplest way to transform a room and provide the perfect solution for the windows of your house. The height of the shade is adjusted by pulling on one or the other side of cord loop 13. To lower the shade, the operator pulls one leg of the cord loop until the shade is at the desired height. The clutch can be adapted easily to accommodate know shade weights. 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. Shade material 1 is partially wound around roller 3. The device contains a means for receiving a wall or ceiling mounted window shade bracket. 3, will slip easily when rotating pulley element 17 is rotated in the clockwise direction. This method is appropriate for the blinds which have ball and chain styles of cords.

This mechanism has been in use for many years, but it is notoriously unpopular among users. A spring clutch mechanism for the operation of roller shades and other rollable items. 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. As well, if you are uncomfortable on your own, look for the help of a professional. 3,135,369, 4,372,432, 4,433,765 and U.S. patent application Ser. FIGS.

Some prior art clutches offer the advantage that they can operate in either direction of rotation. Fixed housing element 15 is generally comprised of shroud portion 19 and cylindrical extension 21. 9 discloses an embodiment of the inventive clutch in which the stationary element is the exterior one. 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. All rights reserved. Therefore, friction devices are usually made to be adjustable in the field. Accordingly, FIG. Spring 59 has tail 63 which is captured in slot 65, and spring 61 has tail 67 which is captured in slot 69 on the opposite side of sleeve 71. 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. FIG. 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. 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. 1 shows a mounted shade and roller assembly.

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. 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). In FIG. 9 has only two component parts. Other objects and advantages of our invention will become apparent from the descriptions that follow.

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. The two spring arrangement of the clutch of FIG. 9, The two component parts of the clutch are fixed housing 79 and rotating pulley element 81. FIG. 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. On the other hand, many prior art clutches require a substantial movement of the pulley before the shade begins to move. The shade will remain at the selected position with no further action required of the operator. However, friction brakes are quite variable, depending upon heat, humidity, wear, and even the length of time that the shade has been in position. Pivoting assembly 7 is inserted into the opposite end of roller 3. Those who are expert in the art of wrap spring clutches will be familiar with the methods and techniques required. 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. 5, cut-away to show the spring; FIG. The shade is operated by a cord loop which passes over a pulley in the device. Your email address will not be published. An alternative embodiment for the same use and of the same general configuration uses discrete wire springs. The solution to the problem lies in the thorough cleaning of the pawl and lubricant application to the rotating part of the blinds. 2 is a perspective view of the preferred embodiment of the inventive roller window shade clutch showing the end which, in use, is inserted into an opening in the end of the shade roller; FIG. 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. To raise the shade, the operator pulls the other leg of the cord loop until the shade reaches the desired position, again with no further action required to hold it in position. FIG. Keeping the spring as a separate part allows the clutch more easily to suit a variety of shade sizes and weights. In the direction for raising the shade, the overrunning clutch slips at a low torque because the spring tends to unwind. 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. This facilitates the mounting of the clutch to a headrail, such as is commonly used with Venetian 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. 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. 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.