Patent Application
20190024448
The present invention generally relates to curtain accessory technology, and more specifically, relates to a pull-cord control device for a curtain without an operation cord.
Curtains are generally made of cloth, hemp, aluminum pieces, wood pieces, or metal materials, and have functions of shading and heat insulation and adjusting the light in the rooms. Control methods of the curtains include manual and electric methods. The manual curtains include manual opening and closing curtains, manual bead roller blinds, manual silky vertical curtains, manual wood louvers, manual Roman blinds, and manual organ curtains. The electric curtains include electric opening and closing curtains, electric roller blinds, electric silky louvers, electric canopy curtains, electric wood louvers, electric Roman blinds, and electric organ curtains. With the development of the curtains, the curtains have become indispensable interior decorations with a perfect combination of functionality and decoration.
However, an electric curtain needs to be limited by the power supply. The lifting operation of the electric curtain is troublesome without the external power supply. A traditional manual curtain not only needs a power unit for pulling back the curtain, but also needs a control device for fixing the curtain. Most of the current control devices use gear control, and gear control is easy to cause damage to pull cords of the curtains. Moreover, because the gears are made of metal, the gears are easy to rust and have high production cost. In addition, the use of gear control is not easy to adjust the amount of tension of the pull cords.
A technical problem to be solved of the present disclosure is to provide a pull-cord control device for a curtain without an operation cord, to conveniently adjust the amount of friction between the control device and the pull-cord, so as to conveniently control a lifting position of the curtain.
To resolve the above-mentioned technical problems, the present invention provides a pull-cord control device for a curtain without an operation cord. The control device includes a pull-cord, a base, and a pressing plate rotatably mounted to the base through a rotation shaft. The pressing plate forms a pressing portion that cooperates with the base to clamp or loosen the pull-cord. The base forms a plurality of first friction shafts. The first friction shafts extend from a side of the base facing the pressing portion. The pressing portion forms a plurality of second friction shafts staggered with the corresponding first friction shafts, and the second friction shafts extend from a side of the pressing portion facing the base. An end of the pressing plate forms a fixing pole. A first end of the pull-cord is connected to a retractable-cord device of the curtain, and a second end of the pull-cord extends between the first friction shafts and the second friction shafts, and is connected to a curtain body of the curtain after extending about the fixing pole. When the curtain body moves up and down, the pressing plate is rotated relative to the base between a clamping position and a loose position about the rotation shaft under the action of the pull-cord. When the pressing plate is in the clamping portion, the second friction shafts actuate the pull-cord to wander between the first friction shafts and the second friction shafts.
Furthermore, the pressing plate includes two parallel side plates, opposite ends of the fixing pole are disposed between ends of the side plates away from the pressing portion.
Furthermore, the base defines a slot for accommodating the pressing portion, the first friction shafts are disposed between two sidewalls of the slot.
Furthermore, when the pressing portion and the base are in the clamping position, a distance between upper edges of the first friction shafts and a bottom wall of the slot is greater than a distance between lower edges of the second friction shafts and the bottom wall of the slot.
Furthermore, each of the first friction shafts and the second friction shafts comprises a shaft core and a friction-material layer wrapped around the shaft core.
Furthermore, a total number of the first friction shafts and the second friction shafts is not less than three, and a difference between the numbers of the first shafts and the second shafts is not more than one.
Furthermore, the second friction shafts are disposed between the side plates, and bottom sides of the side plates define a plurality of avoiding recesses corresponding to the first friction shafts.
Furthermore, the rotation shaft is located at an end of the pressing plate away from the fixing pole, or located between the fixing pole and the pressing portion of the pressing plate.
According to the above-mentioned technical solutions, the present disclosure has at least the following advantages. The embodiment of the present disclosure provides the first friction shafts on the base and the second friction shafts on the pressing plate. The use of the first friction shafts and the second friction shafts can effectively increase the friction between the device and the pull-cord. By changing the number and positional relationship of the first friction shafts and the second friction shafts, the friction between the pull-cord and the first friction shafts and the second friction shafts can be controlled. The friction between the first friction shafts, the second friction shafts and the pull-cord is superimposed by the gravity of the curtain itself, and can be balanced with the pulling force of the retractable-cord device, so that the curtain can be arbitrarily adjusted to any height, so as to facilitate the lifting operation of the curtain body.
The invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the following illustrative embodiments and illustrations are merely illustrative of the invention, and are not intended to limit the invention, and the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Referring to
The embodiment of the present disclosure provides the first friction shafts 11 on the base 1 and the second friction shafts 21 on the pressing plate 2. The use of the first friction shafts 11 and the second friction shafts 21 can effectively increase the friction between the control device and the pull-cord 3. By changing the number and positional relationship of the first friction shafts 11 and the second friction shafts 21, it is possible to control the amount of friction between the pull-cord 3 and the first and second friction shafts 11 and the second friction shafts 21. The gravity of the curtain itself is superimposed by the friction between the first and second friction shafts 11 and 21 and the pull-rope 3 can be balanced with the pulling force of the retractable-cord device 5, so that the curtain body 6 of the curtain can be arbitrarily adjusted to any height to facilitate the lifting operation of the curtain body 6.
In an alternative embodiment, the pressing plate 2 includes two parallel side plates 22. Opposite ends of the fixing pole 41 are disposed between ends of the side plates 22 away from the pressing portion.
In the embodiment, forming the fixing pole 41 can obtain a support point for the rotation of the pressing plate 2 driven by the pull-cord 3. Using the principle of the lever, the pressing plate 2 can be moved in a direction away from the base 1 when the retractable-cord device 5 retracts the curtain body 6.
In an alternative embodiment, the base 1 defines a slot (not labeled) for accommodating the pressing portion. The first friction shafts 11 are disposed between opposite sidewalls of the slot.
In the embodiment, defining the slot facilitates fixing the position of the pressing portion, so that the cooperation between the base 1 and the pressing plate 2 is more stable, and the control device can be more streamlined.
In an alternative embodiment, when the pressing portion and the base 1 are in the clamping position, a distance between upper edges of the first friction shafts 11 and a bottom wall of the slot is greater than a distance between lower edges of the second friction shafts 21 and the bottom wall of the slot.
In the embodiment, the distance between the upper edges of the first friction shafts 11 and the bottom wall of the slot is greater than the distance between the lower edges of the second friction shafts 21 and the bottom wall of the slot, so as to ensure that there is contact area between the pull-cord 3 and the first friction shafts 11 and the second friction shafts 21, and the friction is provided.
Referring to
In the embodiment, adding the friction-material layer 212 enables the pull-cord 3 to be completely abutted against surfaces of the first friction shafts 11 and the second friction shafts 21, so as to effectively increase the contact area between the pull-cord 3 and the first friction shafts 11 and the second friction shafts 21, thereby improving the friction.
In an alternative embodiment, a total number of the first friction shafts 11 and the second friction shafts 21 is not less than three, and a difference between the numbers of the first shafts 11 and the second shafts 21 is not more than one.
In an alternative embodiment, the second friction shafts 21 are disposed between the two side plates 22, and bottom sides of the side plates 22 further define avoiding recesses 24 corresponding to the first friction shafts 11.
In the embodiment, defining the avoiding recesses 24 corresponding to the first friction shafts 11 can function to fix and limit the first friction shafts 11, and can also make a greater staggered setting of the second friction shafts 21 and the first friction shafts 11.
Referring to
In the embodiment, according to the principle of the lever, the rotation shaft 42 can be flexibly disposed at one end or the middle of the pressing plate 2, so as to effectively improve the flexibility of the control device.
In an alternative embodiment, the base 1 and the pressing plate 2 are integrally formed by injection molding, and the injection molding integrated molding method is beneficial to improve production efficiency and save production cost.
Referring to
While the embodiments of the present disclosure have been shown and described, it is understood by those skilled in the art that various changes, modifications, replacement, and variants can be made in the embodiments without departing from the principles and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2016/110246 | 12/16/2016 | WO | 00 |
