Patent Description:
An electric curtain is known from the prior art, for example from document <CIT>, which discloses respectively an electric curtain according to the preamble of each of the claims <NUM> and <NUM>. In general, an electric curtain comprises a curtain rod installed onto a wall and configured to be corresponsive to an upper edge of a window, a curtain body (such as a piece of curtain cloth) hung under the curtain rod, and an electric motor for controlling the curtain body to an open or closed position.

However, both ends of the curtain rod are usually assembled with an accessory for aesthetic purposes, and the accessories of the conventional electric curtain generally have the issue of inconvenient installation or removal, which is not conducive to maintenance, repair, or replacement of the accessories.

In the control of the conventional electric curtain to the open or closed position, the electric motor is used to drive a belt to rotate, so that it is necessary to adjust the tightness of the belt during an installation or after a long- time use, but the conventional electric curtain usually does not have the function of adjusting the tightness of the belt, which has been criticized for a long time.

In view of the aforementioned drawbacks of the prior art, the discloser of this disclosure based on years of experience in the related industry to conduct extensive research and experiment, and finally provided a feasible solution to overcome the drawbacks of the prior art.

Therefore, it is a primary object of this disclosure to provide an electric curtain to facilitate the installation and removal of accessories and coupling members and adjusting the tightness of the belt.

To achieve the aforementioned and other objectives, this disclosure discloses an electric curtain according to the independent claims.

Compared with the prior art, the electric curtain of this disclosure has the effects of facilitating the installation and removal of the accessory and the coupling member to make the repair, maintenance or replacement of other accessories easier, as well as adjusting the tightness of the belt.

The technical contents of this disclosure will become apparent with the detailed description of preferred examples accompanied with the illustration of related drawings as follows. It is intended that the examples and drawings disclosed herein are to be considered illustrative rather than restrictive.

With reference to <FIG> and <FIG> for an electric curtain (hereinafter referred to as "electric curtain") in accordance with the first and second example of this disclosure respectively, the electric curtain <NUM> has at least one end assembled with an accessory <NUM>. In this example, both ends of the electric curtain <NUM> are assembled with an accessory <NUM>. For simplicity, only one end is used as an example for illustrating this disclosure.

In <FIG>, the electric curtain <NUM> of the first example of this disclosure comprises a curtain rod <NUM>, a frame <NUM> and a coupling member 4A.

The curtain rod <NUM> has two ends, one having an edge <NUM>. The curtain rod <NUM> has a belt <NUM> passing into the interior thereof.

The frame <NUM> is a metal frame detachably fixed to the interior of the end (which is the end having the edge <NUM>) of the curtain rod <NUM> and has a protruding structure T1 protruding from the end of the curtain rod <NUM>, and the protruding structure T1 has a fixed portion <NUM> as shown in <FIG>. The frame <NUM> has a driven wheel <NUM>, and the driven wheel <NUM> of a preferred example is pivotally installed to the fixed portion <NUM> of the protruding structure T1. The belt <NUM> is installed around the driven wheel <NUM>.

The coupling member 4A is detachably coupled between the protruding structure T1 and the accessory <NUM>, and the coupled coupling member 4A is disposed between the curtain rod <NUM> and the accessory <NUM>. This disclosure further comprises a plurality of first screw members <NUM>, and the coupling member 4A is detachably fixed to the protruding structure T1 and the accessory <NUM> by the plurality of first screw members <NUM>. The first screw member <NUM> includes but not limited to a socket set screw.

Wherein, the coupling member 4A is surrounded around the protruding structure T1 and has a first penetrating screw hole <NUM> formed thereon, and a part of the first screw members <NUM> is screwed into the first penetrating screw hole <NUM>, and a first projection <NUM> protruding from the first penetrating screw hole <NUM> is formed as shown in <FIG>, and the first projection <NUM> is provided for abutting against the outer surface of the protruding structure T1, so that the coupling member 4A can be detachably fixed to the protruding structure T1.

This disclosure further comprises another coupling member 4C (or a second coupling member 4C). The coupling member 4A (or the first coupling member 4A) is detachably coupled to the protruding structure T1, and the other coupling member 4C is fixed to or integrally formed with the accessory <NUM>. The other coupling member 4C is surrounded around the coupling member 4A and has a second penetrating screw hole <NUM>, and the other part of the plurality of first screw members <NUM> is screwed into the corresponding second penetrating screw hole <NUM>, and a second projection <NUM> slightly protruding out from the second penetrating screw hole <NUM> is formed after screw connection as shown in <FIG>, and the second projection <NUM> abuts against the outer peripheral wall of the coupling member 4A, so that the other coupling member 4C together with the accessory <NUM> are detachably fixed to the coupling member 4A.

In other examples not shown in the figures, this disclosure further comprises a single coupling member 4A (or 4C) having an end fixed to or integrally formed with an accessory <NUM> (not shown in the figure) and the other end detachably coupled to the protruding structure T1.

When it is necessary to maintain, repair or replace other accessories, or even adjust the tightness of the belt <NUM> (as described in details below), users only need to remove the first screw member <NUM> in order to remove the accessory <NUM> and the coupling member 4A and/or the coupling member 4C easily. On the other hand, the accessory <NUM> and the coupling member 4A and/or the coupling member 4C can be installed easily. Therefore, this disclosure provides convenient installation and removal.

In <FIG>, the frame <NUM> of this disclosure is movably fixed to an end of the curtain rod <NUM>, so that the frame <NUM> can be moved linearly back and forth with respect to the curtain rod <NUM> in order to adjust the tightness of the belt <NUM>.

The curtain rod <NUM> has a rail 11A, and the frame <NUM> is slidably coupled to the rail 11A and has a fixing screw hole <NUM>. The rail 11A has two side panels <NUM> parallel to each other and separated from each other, and a spacing <NUM> formed between the two side panels <NUM>. This disclosure further comprises at least one second screw member <NUM>, and this example has two second screw members <NUM>, and each second screw member <NUM> has a screw rod <NUM> and a screw top <NUM> coupled to an end of the screw rod <NUM>, and the screw rod <NUM> is passed through the spacing <NUM> and screwed into the fixing screw hole <NUM>, so that the second screw member <NUM> can be secured to clamp and fix the two side panels <NUM> between the screw top <NUM> and the frame <NUM> tightly as shown in <FIG>.

When it is necessary to adjust the tightness of the belt <NUM>, the second screw member <NUM> is loosened, so that the frame <NUM> can be controlled to move linearly with respect to the curtain rod <NUM> to adjust the tightness of the belt <NUM>. When the belt <NUM> is adjusted to a desired tightness, the second screw member <NUM> is secured again.

Of course, there can be two rails of the curtain rod <NUM>, and they are the rail 11A and the other rail 11B arranged opposite to each other. The other rail 11B also has two side panels <NUM> arranged parallel to each other and separated from each other and a spacing <NUM> defined between the two side panels <NUM>. The rail 11A forms a sliding slot 110A by two side panels <NUM> and other structures, and the rail 11B also forms a sliding slot 110B by two side panels <NUM> and other structures. The frame <NUM> has two slidable connecting plates 21A, 21B configured to be corresponsive to the two rails 11A, 11B respectively and a connecting plate <NUM> coupled between the ends of the two slidable connecting plates 21A, 21B, and the two slidable connecting plates 21A, 21B slidably coupled to the two sliding slots 110A, 110B respectively and have the fixing screw hole <NUM> separately.

In <FIG>, the length of the coupling member 4C after connection must be long enough to protrude out from the edge <NUM> of the curtain rod <NUM> in order to cover the edge <NUM>, so that the gap between the curtain rod <NUM> and the frame <NUM> and/or the gap between the curtain rod <NUM> and the coupling member 4A can be hidden.

In <FIG> and <FIG>, the electric curtain <NUM> in accordance with the second example of this disclosure is substantially the same as that of the first example, and the differences between the second example and the first example are described below.

The frame <NUM> is a frame formed by plastic injection molding. The frame <NUM> comprises a protruding structure T2 and a slidable connecting block <NUM> coupled to the protruding structure T2. In a preferred example, the protruding structure T2 comprises a protruding body <NUM> and a cover <NUM> covering the protruding body <NUM>, and the protruding structure T2 has a fixed portion <NUM> formed between the protruding body <NUM> and the cover <NUM> as shown in <FIG>. Wherein, the protruding body <NUM> has a column <NUM> disposed vertically inside the fixed portion <NUM>, and the column <NUM> has an insert hole <NUM> formed along the lengthwise direction thereof, and the cover <NUM> is configured to be corresponsive to the fixed portion <NUM> and covered onto the protruding body <NUM>, so as to sheath on and cover a driven wheel <NUM> of the column <NUM> and limit the driven wheel <NUM> in the fixed portion <NUM> between the cover <NUM> and the protruding body <NUM> for protection. The belt <NUM> is wound around the driven wheel <NUM>. The cover <NUM> has a through hole <NUM> formed at a position corresponding to the insert hole <NUM>.

The second example of this disclosure further comprises a fastener <NUM>, and the fastener <NUM> can be passed through the through hole <NUM> and inserted into the insert hole <NUM> to fix the cover <NUM> onto the protruding body <NUM>.

The sliding slot 110B of the curtain rod <NUM> has a volume greater than that of the the sliding slot 110A, and the volume of the slidable connecting block <NUM> and the volume of the slidable connecting plate 21A are corresponsive to those of the sliding slot 110B and the sliding slot 110A respectively, so that the frame <NUM> can be slidably coupled to the sliding slot 110B by the slidable connecting block <NUM>. The slidable connecting block <NUM> has a fixing screw hole <NUM> formed at a position corresponding to the spacing <NUM> of the rail 11B, and the screw rod <NUM> of the second screw member <NUM> is passed through the spacing <NUM> and screwed into the fixing screw hole <NUM>. When the second screw member <NUM> is secured, the two side panels <NUM> of the rail 11B are clamped tightly and fixed between the screw top <NUM> and the slidable connecting block <NUM> as shown in <FIG>. In <FIG>, the sliding slot 110B is defined and enclosed by a top plate <NUM> of the curtain rod <NUM>, the plurality of side plates <NUM>, and the two side panels <NUM>.

When it is necessary to adjust the tightness of the belt <NUM>, the second screw member <NUM> is loosened, and the frame <NUM> is controlled to move linearly with respect to the curtain rod <NUM> in order to adjust the tightness of the belt <NUM>. After the belt <NUM> is adjusted to an appropriate tightness, the second screw member <NUM> is secured again.

In addition, the coupling member 4B of the second example is a hollow cylinder with an interior space <NUM>. The outer end of the protruding body <NUM> has a corresponding panel <NUM> in a shape corresponding to that of the interior space <NUM>. The coupling member 4B is surrounded around the protruding structure T2 and the corresponding panel <NUM> is plugged into the interior space <NUM>, so that the coupling member 4B can be fixed to the protruding structure T2.

Claim 1:
An electric curtain (<NUM>), comprising:
a curtain rod (<NUM>);
a belt (<NUM>) passing into the interior of the curtain rod (<NUM>);
an electric motor for driving the belt (<NUM>) to rotate;
a frame (<NUM>), detachably fixed to the curtain rod (<NUM>) and having a protruding structure (T1) protruding from an end of the curtain rod (<NUM>), and the protruding structure (T1) having a fixed portion (<NUM>), and the fixed portion(<NUM>) having a driven wheel (<NUM>) around which the belt (<NUM>) is installed, and the frame (<NUM>) being movably fixed to the curtain rod (<NUM>);
an accessory (<NUM>) for aesthetic purposes assembled on at least the end of the curtain rod (<NUM>) from which the protruding structure (T1) of the frame (<NUM>) is protruding; and
a coupling member (4A, 4C), detachably coupled between the protruding structure (T1) and the accessory (<NUM>), and the coupled coupling member (4A, 4C) being disposed between the curtain rod (<NUM>) and the accessory (<NUM>); characterized in that the electric curtain (<NUM>) further comprises:
a plurality of first screw members (<NUM>) and a second screw member (<NUM>), and the coupling member (4A or 4C) being detachably coupled by the plurality of first screw members, and the curtain rod having a rail (11A), and the frame (<NUM>) being slidably coupled to the rail and having a fixing screw hole (<NUM>) formed thereon, and the rail having two side panels (<NUM>), and a spacing (<NUM>) being defined between the two side panels, and the second screw member having a screw rod (<NUM>) and a screw top (<NUM>), and the screw rod passing through the spacing and being spirally coupled to the fixing screw hole, and the two side panels being included between the screw top and the frame (<NUM>).