Patent Description:
With the development of the society and the innovation of technologies, the daily life is increasingly intelligentized. More and more intelligent furniture appears in our daily life. As a daily necessity, an electric curtain is a popular and commonly used intelligent furniture, which adopts different control manners, such as remote controller, wire control, and voice control. It can be also closed at a set timing. Existing electric curtains are generally driven by a motor with reducer. However, they cannot be opened or closed by hand if there is a power cut, which may significantly influence the user experience.

China patent application no. <CIT>, titled "Force Balance Assembly of Cordless Curtain", discloses a force balance assembly. The force balance assembly adopts a variable-force spiral spring. By setting related performance parameters and numbers of the spiral spring, a torque force of the spiral spring and the gravity of the curtain cloth are kept at a balance state during the stroke of the curtain, so that the curtain can hover at any position. In another document, <CIT>, a motorized roller curtain is described using a spiral spring device mounted inside of a second end of the roller and having a fixed shaft. It further contains a rotation stop notch provided on the outer rotatable frame, whereby the outer rotatable frame is synchronously rotated with the roller. It traditionally describes two fixed brackets configured for fixing the spiral spring device and the motor respectively. It is required only a small outer force to break the force balance, and lift the curtain by pushing or pulling, which provides an excellent experience for user.

In addition, considering different sizes, for example, various lengths and widths, of a window, different materials of curtains, and different weight/unit area of curtains of different materials, manufacturers produce a variety of spiral spring devices and rollers with different specifications, so that a customer can choose and match up. This satisfies diversified demands for customers, but too many specifications of spiral spring devices and rollers impose a large challenge to the manufacturers in terms of management of research, development, production, assembling, sale, and inventory. Therefore, for the purpose of cost controlling, the manufacturers can only produce curtains with limited standard sizes and limited number of curtains cloths, assemble the whole of curtains, and wholesale them to the retailers, which then sale the hovering rolling curtains to customers. This, however, seriously affect a market size of this kind of hovering rolling curtain, since curtains belong to highly customized products.

In view of the above, the present application provides a rolling curtain and an assembling method thereof. In some embodiments, the present application provides a havoring-type rolling curtain.

A rolling curtain provided in the present application adopts the following technical solution. A rolling curtain includes:.

Preferably, a first stop plate is provided on the first fixed bracket, a first stop groove is provided on an outer end of the fixed shaft, the first stop plate is inserted in the first stop groove, a second stop plate is provided on the second fixed bracket, a second stop groove is provided on an outer end of the motor, and the second stop plate is inserted in the second stop groove.

In the above technical solution, since the fixed shaft and the motor themselves cannot be rotated, it is required an outer structure to fix them. A first stop plate is provided on the first fixed bracket, and a second stop plate is provided on the second fixed bracket in the present application to prevent the fixed shaft and the motor from being rotated. The first stop plate and the second stop plate also have a role of supporting, which can support the whole rolling curtain.

Preferably, a bearing is sleeved on a housing of the motor, the bearing matches with the inner wall of the roller, a driving plate is provided on a motor shaft of the motor, and the driving plate is interfered with the stop strip so that the driving plate drives the roller to rotate.

In the above technical solution, since the motor itself cannot be rotated, there is a friction force between the motor and the inner wall of the roller. The friction forces are hard to control and differ from each other between different rolling curtain. A bearing is provided between the motor and the inner wall of the roller in the present application, extremely reducing the friction force at this position. The rolling curtains produced by different batches have little difference, which is not easy to influence the balance condition of the hovering rolling curtain.

Preferably, a through hole is provided on an inner end of the spiral spring, a mounting plane is provided at a corresponding position on the fixed shaft, a screw hole is provided on the mounting plane, the inner end of the spiral spring is fixedly connected to the mounting plane of the fixed shaft by screw, a hook is provided on an outer end of the spiral spring, a traverse rod is provided on the outer rotatable frame, and the hook is hooked on the traverse rod.

In the above technical solution, since the outer contour of the fixed shaft is an arc surface, which is not easy to mount the inner end of the spiral spring, so that the spiral spring is unstable and easily to be dissembled. A mounting plane (where the section of the fixed shaft has a D-shape) is provided on the fixed shaft, the inner end of the spiral spring has a certain radian, which could be understood as an elastic gasket, so that the inner end of the spiral spring can be well and stably fixed after locking by a screw.

Preferably, the spiral spring device further includes an auxiliary spiral spring, an auxiliary shaft and a key, two ends of the auxiliary shaft are rotatably provided in the shaft holes of two adjacent vertical partition plates respectively, the auxiliary spiral spring with one end fixed connected to the auxiliary shaft and the other end fixedly connected to the outer rotatable frame is sleeved on the auxiliary shaft, key holes are provided on centers of the fixed shaft and the auxiliary shaft, the key is inserted in the key hole of the auxiliary shaft from the keyhole of the fixed shaft, so that the fixed shaft and the auxiliary shaft are synchronously rotated.

Repeated disassembling and assembling of the spiral spring device for adjusting is also a tedious operation. In the above technical solution, an auxiliary spiral spring and an auxiliary shaft are provided in the present application in order to avoid this condition. Generally, the key is preferably inserted in the key hole of the auxiliary shaft, so that the fixed shaft and the auxiliary shaft are synchronously rotated, which can be regarded as one shaft. The auxiliary spiral spring has the same effect as the other spiral springs. The key can be taken out when the torque force of the spiral spring is too large in the adjusting process, so that the auxiliary shaft won't be synchronously rotated with the fixed shaft, which is equivalent that the auxiliary spiral spring is disused, having no function. The torque force of the spiral spring device and the gravity of the curtain cloth can under a balance. It is easy to adjust since the spiral spring device is not necessary to be disassembled.

Preferably, the auxiliary spiral spring has a same torsion variation curvature as that of the spiral spring, the torque force of the auxiliary spiral spring is smaller than that of the spiral spring in the same position.

In the above technical solution, since the torque force of the auxiliary spiral spring is an additional variable, which is a key factor for adjusting the torque force. If the torsion value of the auxiliary spiral spring is relatively large, it cannot play a role of adjusting. Therefore, the torque force of the auxiliary spiral spring in the present application is reduced.

Preferably, the spiral spring device further includes a plurality of auxiliary spiral springs and a plurality of auxiliary shafts, and the plurality of auxiliary shafts are coaxial arranged.

In the above technical solution, a plurality of auxiliary spiral springs are provided, and each of the auxiliary spiral springs can be used or disused, so as to enlarge the adjusting range of torque force of the spiral spring device, satisfying various demands of customers.

Preferably, the key holes and the key all have rectangular sections.

In the above technical solution, the rectangular key has a better transmission effect.

Preferably, a plurality of reserved holes for dodging the screws are provided on the key, and the reserved holes have an oblong shape.

In the above technical solution, the key in the present application needs to be moved back and forth, so a plurality of reserved holes for allowing the screws to move are provided on the key, the reserved holes have an oblong shape, so as to be moved back and forth in a certain range.

Preferably, the inner wall of the roller is a rough surface, configured for increasing the friction force between the spiral spring and the inner wall of the roller.

In the above technical solution, the spiral spring is loosened in the roller to abut against the inner wall of the roller. The inner wall of the roller in the present application is designed as a rough surface to increase the friction force between the spiral spring and the inner wall of the roller, prevent the axial movement of the spiral spring device in the interior of the roller when the spiral spring is tightened.

The present application provides another technical solution. An assembling method of the above hovering rolling curtain includes the following steps:.

In the above technical solution, the assembling method in the present application can realize the assembling of the spiral spring at retailers or customers, which is convenient for assembling on site. The torque force of the spiral spring device can be adjusted in a certain range to satisfy the demands of different sizes and different materials of the curtain cloth for customers, further to meet the demand of highly customization, which is expected to expand the market size.

In conclusion, the present application can achieve at least one of the following beneficial effects:.

The hovering rolling curtain in the present application could realize a control by both manual and automatic operations. The curtain can be manually closed when there is a power cut or a remote controller is not available, improving use experience for a user.

The spiral spring device in the present application is newly designed, so as to be assembled at retailers and even by the customers themselves. The torque force of the spiral spring device can be adjusted in a certain range to satisfy the demand of different curtain cloth sizes and different curtain cloth materials for customers, further to meet the demand of highly customization, which is expected to expand the market size.

In the present application, when customers want to change curtain cloths in different weights afterwards, it is chosen to decrease or increase a spiral spring according to that the curtain cloth becomes lighter or heavier, obviously reducing the replacement cost.

A bearing is provided between the motor and the inner wall of the roller in the present application, extremely reducing the friction force at this position. The rolling curtains produced by different batches have little difference, which is not easy to influence the balance condition of the hovering rolling curtain.

Listing of reference signs: <NUM> roller; <NUM> stop strip; <NUM> curtain cloth groove; <NUM> curtain cloth; <NUM> snap-in strip; <NUM> lower rod; <NUM> motor; <NUM> second stop groove; <NUM> bearing; <NUM> driving plate; <NUM> spiral spring device; <NUM> fixed shaft; <NUM> pin hole; <NUM> first stop groove; <NUM> mounting plane; <NUM> screw hole; <NUM> screw; <NUM> key hole; <NUM> outer rotatable frame; <NUM> shaft hole; <NUM> rotation stop notch; <NUM> pin hole; <NUM> traverse rod; <NUM> vertical partition plate; <NUM> spiral spring; <NUM> through hole; <NUM> hook; <NUM> inserting pin; <NUM> auxiliary spiral spring; <NUM> auxiliary shaft; <NUM> key hole; <NUM> key; <NUM> reserved hole; <NUM> first fixed bracket; <NUM> first stop plate; <NUM> second fixed bracket; and <NUM> second stop plate.

The present application is further described in details below in combination with <FIG>.

Generally, a stroke length of a single spiral spring matches with the length of a curtain cloth, while a torsion curve of single spiral spring is not to be directly related to the gravity of the curtain cloth, as long as an appropriate number of spiral springs are provided to ensure that the torque force of the spiral spring matches with the gravity of the curtain cloth to realize a balance. Therefore, for a given length of a curtain cloth, a matching spiral spring, as well as an appropriate number thereof, can be chosen based on calculation or experience to match with curtain cloths of different materials and with different widths. The technical solutions of the present application are made based on this principle.

Referring to <FIG> and <FIG>, a rolling curtain disclosed in an embodiment of the present application includes a roller <NUM>, a curtain cloth <NUM>, a lower rod <NUM>, a motor <NUM>, a spiral spring device <NUM>, a first fixed bracket <NUM> and a second fixed bracket <NUM>. A stop strip <NUM> is provided on an inner wall of the roller <NUM>. A semi-opened curtain cloth groove <NUM> is provided on an outer wall of the roller <NUM>. An upper end of the curtain cloth <NUM> is fixedly connected in the curtain cloth groove <NUM> of the roller <NUM> by a snap-in strip <NUM>. The lower rod <NUM> is horizontally arranged on a lower end of the curtain cloth <NUM>. The motor <NUM> is mounted at an inner side of one end of the roller <NUM> and is configured for driving the roller <NUM> to rotate, further to lift the curtain cloth <NUM>. The spiral spring device <NUM> is mounted at an inner side of the other end of the roller <NUM> for providing the hovering force. The first fixed bracket <NUM> and the second fixed bracket <NUM> are positioned at two ends of the roller <NUM> respectively and are configured for fixing the spiral spring device <NUM> and the motor <NUM> respectively. The material of the roller <NUM> generally adopts cylindrical extruded section bar.

Referring to <FIG>, <FIG>, <FIG> and <FIG>, the spiral spring device <NUM> includes a fixed shaft <NUM>, an outer rotatable frame <NUM>, a spiral spring <NUM> and an inserting pin <NUM>. A shaft hole <NUM> is provided on the outer rotatable frame <NUM>. The fixed shaft <NUM> is inserted in the shaft hole <NUM> of the outer rotatable frame <NUM>. The spiral spring <NUM> is sleeved on the fixed shaft <NUM>, with one end thereof fixedly connected to the fixed shaft <NUM> and the other end thereof fixedly connected to the outer rotatable frame <NUM>. A rotation stop notch <NUM> is provided on the outer rotatable frame <NUM>. The rotation stop notch <NUM> is engaged with the stop strip <NUM> on the roller <NUM>. The outer rotatable frame <NUM> is synchronously rotated with the roller <NUM>. Pin holes <NUM>, <NUM> corresponding to each other are provided on the fixed shaft <NUM> and the outer rotatable frame <NUM> respectively. The spiral spring <NUM> is tightly screwed and mounted in the outer rotatable frame <NUM>. The inserting pin <NUM> is inserted in the pin holes <NUM>, <NUM> of the fixed shaft <NUM> and the outer rotatable frame <NUM> for fixedly connecting the fixed shaft <NUM> to the outer rotatable frame <NUM>.

Referring to <FIG>, a first stop plate <NUM> is provided on the first fixed bracket <NUM>. A first stop groove <NUM> is provided on an outer end of the fixed shaft <NUM>. The first stop plate <NUM> is inserted in the first stop groove <NUM>. A second stop plate <NUM> is provided on the second fixed bracket <NUM>. A second stop groove <NUM> is provided on an outer end of the motor <NUM>, and the second stop plate <NUM> is inserted in the second stop groove <NUM>. Since the fixed shaft <NUM> and the motor <NUM> themselves cannot be rotated, it is required an outer structure to fix them. The first stop plate <NUM> is provided on the first fixed bracket <NUM>, and the second stop plate <NUM> is provided on the second fixed bracket <NUM> in the present application to prevent the fixed shaft <NUM> and the motor <NUM> from being rotated. The first stop plate <NUM> and the second stop plate <NUM> also have a role of supporting, which can support the whole rolling curtain.

Referring to <FIG>, <FIG>, a bearing <NUM> is sleeved on a housing of the motor <NUM>. The bearing <NUM> is matched with the inner wall of the roller <NUM>. A driving plate <NUM> is provided on a motor shaft of the motor <NUM>. The driving plate <NUM> is interfered with the stop strip <NUM> so that the driving plate <NUM> drives the roller <NUM> to rotate. Since the motor <NUM> itself cannot be rotated, there is a friction force between the motor <NUM> and the inner wall of the roller <NUM>. The friction forces are hard to control and differ from each other between different rolling curtains. The bearing <NUM> is provided between the motor <NUM> and the inner wall of the roller <NUM> in the present application, extremely reducing the friction force at this position. The rolling curtains produced by different batches have little difference, which is not easy to influence the balance condition of the hovering rolling curtain.

Referring to <FIG>, a through hole <NUM> is provided on an inner end of the spiral spring <NUM>. A mounting plane <NUM> is provided at a corresponding position on the fixed shaft <NUM>. A screw hole <NUM> is provided on the mounting plane <NUM>. The inner end of the spiral spring <NUM> is fixedly connected to the mounting plane <NUM> of the fixed shaft <NUM> by screw <NUM>. A hook <NUM> is provided on an outer end of the spiral spring <NUM>. A traverse rod <NUM> is provided on the outer rotatable frame <NUM>. The hook <NUM> is hooked on the traverse rod <NUM>. Since the outer contour of the fixed shaft <NUM> is an arc surface, which is not easy to mount the inner end of the spiral spring <NUM>, so that the spiral spring <NUM> is unstable and easily to be dissembled. The mounting plane <NUM> (where the section of the fixed shaft <NUM> has a D-shape) is provided on the fixed shaft <NUM>, the inner end of the spiral spring <NUM> has a certain radian, which could be understood as an elastic gasket, so that the inner end of the spiral spring <NUM> can be well and stably fixed after locking by screw <NUM>.

In this embodiment, the inner wall of the roller <NUM> is rough surface, which is configured for increasing the friction force between the spiral spring <NUM> and the inner wall of the roller <NUM>. The spiral spring <NUM> is loosened to abut against the inner wall of the roller <NUM>. The inner wall of the roller <NUM> in the present application is designed as a rough surface to increase the friction force between the spiral spring <NUM> and the inner wall of the roller <NUM>, prevent the axial movement of the spiral spring device <NUM> in the interior of the roller <NUM> when the spiral spring <NUM> is tightened.

The assembling method of the above hovering rolling curtain includes the following steps:.

The detail sequency of the steps is not limited in the present application, some steps can be exchanged, for example, there is no difference whether mounting the motor <NUM> firstly or mounting the spiral spring device <NUM> firstly, which are both feasible.

The implementation principle of the present application is:.

The spiral spring device <NUM> in the Embodiment <NUM> is required to be disassembled repeatedly, and the adjusting is also a tedious operation. Embodiment <NUM> is provided in the present application in order to prevent this situation.

Referring to <FIG> <FIG>, <FIG> and <FIG>, it differs from Embodiment <NUM> in that the spiral spring device <NUM> further includes an auxiliary spiral spring <NUM>, an auxiliary shaft <NUM> and a key <NUM>. Two ends of the auxiliary shaft <NUM> are rotatably provided in the shaft holes <NUM> of two adjacent vertical partition plates <NUM> respectively. The auxiliary spiral spring <NUM> with one end fixed connected to the auxiliary shaft <NUM> and the other end fixedly connected to the outer rotatable frame <NUM> is sleeved on the auxiliary shaft <NUM>. Key holes <NUM>, <NUM> are provided both on centers of the fixed shaft <NUM> and the auxiliary shaft <NUM>. The key <NUM> is inserted in the key hole <NUM> of the auxiliary shaft <NUM> from the keyhole <NUM> of the fixed shaft <NUM>, so that the fixed shaft <NUM> and the auxiliary shaft <NUM> are synchronously rotated.

In this embodiment, the auxiliary spiral spring <NUM> has a same torsion variation curvature with that of the spiral spring <NUM>, the torque force of the auxiliary spiral spring <NUM> is smaller that of the spiral spring <NUM> in the same position. Since the torque force of the auxiliary spiral spring <NUM> is an additional variable, which is a key factor for adjusting the torque force. If the torsion value of the auxiliary spiral spring <NUM> is relatively large, it cannot play a role of adjusting. Therefore, the torque force of the auxiliary spiral spring <NUM> in the present application is reduced. Under the same processing technology, the width of the auxiliary spiral spring <NUM> is designed to be smaller than the width of the spiral spring <NUM>. For a simple example, the curtain cloth <NUM> is pushed to lift when the target pulling force of the hovering rolling curtain reaches <NUM> (it is required to against the friction of the system and the resistance of the motor), and it is better to provide a tolerance of <NUM> by the torque force of the auxiliary spiral spring <NUM>.

Referring to <FIG>, the key holes <NUM>, <NUM> and the key <NUM> all have rectangular sections. The rectangular key <NUM> has a better transmission effect. A plurality of reserved holes <NUM> for dodging the screws <NUM> are provided on the key <NUM>, and the reserved holes <NUM> have an oblong shape. The key <NUM> in the present application needs to be moved back and forth, so a plurality of reserved holes <NUM> for dodging the screws <NUM> are provided on the key <NUM>, the reserved holes <NUM> have an oblong shape, so as to be moved back and forth in a certain range.

When the screwing depth of the screw <NUM> is relatively small, the screw <NUM> is not interfered with key <NUM>, and has no impact on inserting or taking out the key <NUM>, the reserved holes <NUM> can also be omitted.

The implementation principle of this embodiment is that: the auxiliary spiral spring <NUM> and the auxiliary shaft <NUM> are provided in the present application. Generally, the key <NUM> is preferably inserted in the key holes <NUM>, <NUM> of the auxiliary shaft <NUM>, so that the fixed shaft <NUM> and the auxiliary shaft <NUM> are synchronously rotated, which can be regarded as one shaft. The auxiliary spiral spring <NUM> has the same effect as the other spiral springs <NUM>. The key <NUM> can be taken out when the torque force of the spiral spring device <NUM> is too large in the adjusting process, so that the auxiliary shaft <NUM> won't be synchronously rotated with the fixed shaft <NUM>, which is equivalent that the auxiliary spiral spring <NUM> is disused, having no function. The torque force of the spiral spring device <NUM> and the gravity of the curtain cloth <NUM> can reach a balance. It is easy to adjust since the spiral spring device <NUM> is not necessary to be disassembled.

Claim 1:
A rolling curtain, characterized by comprising:
a roller (<NUM>), wherein a stop strip (<NUM>) is provided on an inner wall of the roller (<NUM>) and a half open curtain cloth groove (<NUM>) is provided on an outer wall of the roller (<NUM>);
a curtain cloth (<NUM>), wherein an upper end of the curtain cloth (<NUM>) is fixedly connected in the curtain cloth groove (<NUM>);
a motor (<NUM>), mounted at an inner side of a first end of the roller (<NUM>) and configured for driving the roller (<NUM>) to rotate to lift the curtain cloth (<NUM>);
a spiral spring device (<NUM>), mounted at an inner side of a second end of the roller (<NUM>) and comprising a fixed shaft (<NUM>), an outer rotatable frame (<NUM>), a plurality of spiral springs (<NUM>) and a inserting pin (<NUM>), wherein a shaft hole (<NUM>) is provided on the outer rotatable frame (<NUM>), the fixed shaft (<NUM>) is inserted in the shaft hole (<NUM>) of the outer rotatable frame (<NUM>), the plurality of the spiral springs (<NUM>) are sleeved on the fixed shaft (<NUM>) side by side, a plurality of vertical partition plates (<NUM>) for separating adjacent spiral springs (<NUM>) are provided on the outer rotatable frame (<NUM>), a first end of the spiral spring (<NUM>) is fixedly connected to the fixed shaft (<NUM>) and a second end of the spiral spring (<NUM>) fixedly connected the outer rotatable frame (<NUM>), a rotation stop notch (<NUM>) is provided on the outer rotatable frame (<NUM>), the rotation stop notch (<NUM>) is engaged with the stop strip (<NUM>) on the roller (<NUM>), the outer rotatable frame (<NUM>) is synchronously rotated with the roller (<NUM>), pin holes (<NUM>, <NUM>) corresponding to each other are provided on the fixed shaft (<NUM>) and the outer rotatable frame (<NUM>) respectively, the spiral spring (<NUM>) is mounted in the outer rotatable frame (<NUM>), and the inserting pin (<NUM>) is inserted in the pin holes (<NUM>, <NUM>) of the fixed shaft (<NUM>) and the outer rotatable frame (<NUM>) for fixedly connecting the fixed shaft (<NUM>) to the outer rotatable frame (<NUM>); and
a first fixed bracket (<NUM>) and a second fixed bracket (<NUM>), which are positioned at two ends of the roller (<NUM>) respectively and are configured for fixing the spiral spring device (<NUM>) and the motor (<NUM>) respectively.