Patent Application
20130186722
The present invention relates to a deceleration device for window shade, and more particularly to a deceleration device that provides good applicability and can be mounted in a shade roller tube of any window shade that has already been provided with an automatic winding mechanism, and can work with the automatic winding mechanism by gradually increasing the resistance to the winding of a shade fabric around the shade roller tube by the automatic winding mechanism, so as to prevent the shade fabric from being instantaneously lifted to adversely damage the window shade.
Conventionally, a window shade, such as a Roman shade, includes a traverse shade roller tube, a lifting unit, a shade fabric connected to a lower edge of the shade roller tube, and an automatic winding mechanism installed in the shade roller tube and connected to the shade fabric. With the above arrangements, the window shade can be automatically wound up around the shade roller tube.
Since the automatic winding mechanism is designed without being subjected to any resistance when it winds up the shade fabric around the shade roller tube, a relatively strong instantaneous winding force provided by the automatic winding mechanism would possibly form a high impact on the window shade to result in undesirable damage of the window shade. To overcome the aforesaid disadvantage, various deceleration mechanisms for window shade have been developed for preventing the damage caused by the upward instantaneous winding force. However, all the currently commercially available deceleration mechanisms for window shade are so designed that they are assembled to an automatic winding mechanism for use. In the case of a window shade that already includes an automatic winding mechanism but not a deceleration mechanism, the user has to discard the old window shade and replace it with a new one equipped with an automatic winding mechanism having a deceleration mechanism assembled thereto, in order to overcome the problem caused by the strong and instantaneous winding force. Under this circumstance, it is obviously an unnecessary waste to discard the still useful old window shade and the automatic winding mechanism thereon just because the conventional deceleration mechanism has limited applicability and can not be separately mounted on the shade roller tube for use with the existing automatic winding mechanism.
It is therefore desirable to develop a deceleration device that provides good applicability and can be used with any window shade, so as to protect the window shade against damage due to instantaneous lifting of the shade fabric thereof by the automatic winding mechanism.
In view of the drawbacks in the prior art, it is tried by the inventor to develop an improved deceleration device that has good applicability for use with any window shade to protect the same against damage.
A primary object of the present invention is to provide a deceleration device for window shade, which provides good applicability and can be mounted in a shade roller tube of any window shade that has already been provided with an automatic winding mechanism, and work with the automatic winding mechanism by gradually increasing the resistance to the winding of a shade fabric around the shade roller tube by the automatic winding mechanism, so as to prevent the shade fabric from being instantaneously lifted to adversely damage the window shade.
To achieve the above and other objects, the deceleration device for window shade according to a preferred embodiment of the present invention includes a casing, and a deceleration mechanism movably fitted in the casing with a front end protruded from the casing.
In the preferred embodiment, the casing is formed of at least two covering members closed to one another, and the deceleration mechanism is movably received in between the covering members.
In the preferred embodiment, the deceleration mechanism includes a barrel movably received in the casing, a shaft fitted in the barrel, a screw extended through the barrel to connect to the shaft, an elastic element put around the shaft, and a stopper fitted around a rear end of the shaft to locate behind the elastic element and contacting with an inner surface of the casing.
In the preferred embodiment, the barrel includes a locating block formed at a front end thereof to forward protrude from the casing, and a pipe portion formed at a rear end thereof. The pipe portion is provided on an inner surface with two diametrically opposite guide slots corresponding to each other; and the shaft is provided on an outer surface at a front end thereof with two radially outward raised blocks for correspondingly and movably engaging with the two guide slots.
In the preferred embodiment, the shaft is tapered toward the rear end, around where the stopper is fitted.
In the preferred embodiment, the stopper is provided with a slit extending a full axial length thereof.
With the above arrangements, the deceleration device provides good applicability because the casing can be mounted in a shade roller tube of any window shade that has already been provided with an automatic winding mechanism and the deceleration mechanism can work with the automatic winding mechanism by gradually increasing the resistance to the winding of a shade fabric around the shade roller tube by the automatic winding mechanism, so as to prevent the shade fabric from being instantaneously lifted to adversely damage the window shade.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
The present invention will now be described with some preferred embodiments thereof and with reference to the accompanying drawings.
Please refer to
The casing 1 is formed of at least two covering members closed to one another. In the illustrated preferred embodiment, there are two covering members 11, 12.
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The deceleration device for window shade according to the present invention is novel, improved and industrially practical for use. The present invention is novel and improved because the casing can be mounted in a shade roller tube of any window shade that already has an automatic winding mechanism, and the deceleration mechanism can work with the automatic winding mechanism by gradually increasing the resistance to the winding of the shade fabric around the shade roller tube by the automatic winding mechanism, so as to prevent the shade fabric from being instantaneously lifted to adversely damage the window shade. And, the present invention is industrially practical for use because the deceleration device can be used with a window shade having an automatic winding mechanism to thereby have good applicability, and products derived from the present invention would no doubt satisfy the current market demands.
The present invention has been described with a preferred embodiment thereof and it is understood that many changes and modifications in the described embodiment can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
