Roll screen device

Abstract

To provide a roll screen device configured in such a manner of mounting a roll-up drum to a screen frame in an easy and reliable manner.SOLUTION: A roll screen device, in which a winding shaft 6 thereof has a shaft core member 18 equipped with a runner portion 12 that moves within an upper horizontal frame rod 2 of a screen frame 1 and a winding drum 19 for winding a screen that is connected to the shaft core member 18 for relative rotation about a central axis L of the winding shaft 6 and for relative movement up and down along the central axis L, is configured such that one end and the other end of a torsion spring 7 are connected to the winding drum 19 and the shaft core member 18, respectively, a compression spring 27 as a separate member from the torsion spring 7 is interposed between the winding drum 19 and the shaft core member 18, the winding drum 19, when the winding drum 19 rises relative to the shaft core member 18, engages with the shaft core member 18 and becomes non-rotatable, and the winding drum 19, descends due to its own weight, the engagement between the winding tube 19 and the shaft core member 18 is released, which makes the winding tube 19 rotatable.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a roll screen device attached to a building opening for the purpose of light shielding, heat insulation, privacy, insect prevention, prevention of pollen intrusion, and the like.

Background Art

[0002] A roll screen device in which a screen for light shielding, heat insulation, privacy, insect prevention, prevention of pollen intrusion, etc. is stretched inside a screen frame attached to a building opening, and this screen is opened and closed by an operation frame that can move horizontally within the screen frame, is known as disclosed in Patent Document 1.

[0003] A known roll screen device includes a winding cylinder 2 having a restoring body 18' that generates a rotational force for winding the screen built therein, and a moving bar 1 for opening and closing the screen, which are respectively attached to a screen frame composed of upper and lower guide rails 10, 12 and left and right fixed bars 3, 4 so as to be horizontally movable along the guide rail 10 by runners provided thereon. One of the two screens 5, 5 is stretched between the winding cylinder 2 and one of the fixed bars 3, and the other screen 5 is stretched between the winding cylinder 2 and the moving bar 1. The two screens 5, 5 are wound around the winding cylinder 2 or unwound from the winding cylinder 2 by the movement operation of the moving bar 1 to be opened and closed.

[0004] However, in such a roll screen device, generally, when attaching the winding cylinder to the screen frame, the restoring body is twisted by rotating the runner with respect to the winding cylinder to accumulate the restoring force in the screen winding direction, and the winding cylinder must be attached to the screen frame in a state where the accumulated restoring force prevents the winding cylinder from rotating. Therefore, not only is the attachment work troublesome, but there is also a problem that the winding cylinder may unexpectedly rotate during the attachment work, causing an obstacle to the attachment work.

[0005] Therefore, in a known roller screen device, an anti-return rotation mechanism composed of gears 7'a and 19'a is formed between the runner 7' and the winding cylinder 2', and the winding cylinder 2' is attached to the screen frame while preventing the rotation of the winding cylinder 2' by this anti-return rotation mechanism. That is, with the meshing between the gear 7'a on the runner 7' side and the gear 19'a on the winding cylinder 2' side released, the runner 7' is rotated to accumulate a restoring force in the restoring body 18', and then the runner 7' and the winding cylinder 2' are pulled towards each other by the tensile force of the restoring body 18' to mesh the gears 7'a and 19'a with each other, thereby preventing the rotation of the runner 7'. When the runner 7' is suspended from the guide rail 10 in this state, the restoring body 18' extends due to the weight of the winding cylinder 2' and the meshing of the gears is released, so that the winding cylinder 2' can rotate back.

[0006] However, in a known roller screen device, the restoring body 18' made of a coil spring not only has an elastic force capable of accumulating a restoring force for winding the screen, but also has an elastic force capable of effectively activating the anti-return rotation mechanism composed of the gears 7'a and 19'a by pulling the runner 7' and the winding cylinder 2' towards each other when attaching the winding cylinder 2' to the screen frame, and an elastic force capable of releasing the anti-return rotation mechanism by separating the runner 7' and the winding cylinder 2' after suspending the runner 7' from the guide rail 10. Therefore, it is difficult to select a spring with an optimal elastic force. If the selection of the spring is incorrect, it may cause inconveniences such as difficulty in attaching the winding cylinder to the screen frame or inability to smoothly open and close the screen.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The technical problem of the present invention is to provide a roll screen device that enables easy selection of a spring having an optimal elastic force, allows for easy and reliable attachment of a winding cylinder to a screen frame, and enables smooth opening and closing of the screen.

Means for Solving the Problem

[0009] To solve the above problems, the present invention provides a winding shaft with a built-in torsion spring that generates a rotational force for winding a screen on a screen frame composed of upper and lower horizontal frame bars and left and right vertical frame bars, and an operation frame for performing opening and closing operations of the screen. The winding shaft and the operation frame are attached so as to be horizontally movable. One of the two screens is stretched between the winding shaft and one of the vertical frame bars, and the other screen is stretched between the winding shaft and the operation frame. In a roll screen device in which the two screens are wound around the winding shaft or fed out from the winding shaft by the movement operation of the operation frame, the winding shaft includes a shaft core member having a runner portion that moves within the upper horizontal frame bar of the screen frame, and a winding cylinder for winding the screen that is coupled to the shaft core member so as to be relatively rotatable about the central axis of the winding shaft and relatively vertically movable along the central axis. One end and the other end of the torsion spring are connected to the winding cylinder and the shaft core member, and a compression spring separate from the torsion spring is interposed between the winding cylinder and the shaft core member. When the shaft core member is pushed by the compression spring and descends relative to the winding cylinder, the winding cylinder engages with the shaft core member and becomes non-rotatable. When the winding cylinder descends against the compression spring due to its own weight, the engagement between the winding cylinder and the shaft core member is released and the winding cylinder becomes rotatable.

[0010] In the present invention, it is desirable that a hollow cap is attached to the upper end of the winding cylinder, an engagement shaft that fits into the cap is provided on the shaft core member, and protrusions that engage with each other at a position where the winding cylinder rises relative to the shaft core member are formed on the engagement shaft and the cap, respectively. Further, in the present invention, it is preferable that a spring shaft extending downward from the engagement shaft and fitting into the winding cylinder is provided on the shaft core member, and the compression spring is interposed between a spring receiving portion provided on the spring shaft and the cap.

[0011] Furthermore, in the present invention, the runner portion has a rectangular shape in plan view, and has guide rollers rotatable about a vertical axis at a pair of diagonal portions, and is inserted into the upper horizontal frame bar in a posture with the longitudinal direction of the runner portion oriented in the longitudinal direction of the upper horizontal frame bar, and then rotated by 90 degrees to be placed on a guide rail inside the upper horizontal frame bar, and the guide rollers are configured to contact the inner wall surface of the upper horizontal frame bar when moving inside the upper horizontal frame bar along the guide rail.

Advantages of the Invention

[0012] According to the present invention, the accumulation of the rotational force for winding up the screen is performed by a torsion spring, and when attaching the winding cylinder to the screen frame, the winding cylinder is engaged with the shaft core member to make it non-rotatable, or after attaching the winding cylinder to the screen frame, the operation of releasing the engagement between the winding cylinder and the shaft core member to make the winding cylinder rotatable is performed by a compression spring separate from the torsion spring. By configuring in this way, a spring having an appropriate elastic force can be easily selected for each application. As a result, the attachment of the winding cylinder to the screen frame can be performed simply and reliably, and the opening and closing of the screen can be performed smoothly.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0014] The figure shows an embodiment of a roll screen device according to the present invention. This roll screen device is attached to building openings such as building windows and entrances for the purposes of light shielding, heat insulation, eye concealment, insect prevention, prevention of pollen intrusion, etc. and used.

[0015] As shown in FIG. 1, the roll screen device includes a screen frame 1 composed of upper and lower horizontal frame bars 2 and 3 and left and right vertical frame bars 4 and 5, and a take-up shaft 6 with a built-in torsion spring 7 (see FIG. 2) that generates a rotational force for winding the screen, and an operation frame 8 for opening and closing the screen. They are attached so as to be horizontally movable along the upper and lower horizontal frame bars 2 and 3. By connecting one end and the other end of one of the two screens (for example, an insect net) 9 to the take-up shaft 6 and one of the vertical frame bars (left vertical frame bar) 4, the one screen 9 is stretched between the take-up shaft 6 and one vertical frame bar 4. At the same time, by connecting one end and the other end of the other screen 10 to the take-up shaft 6 and the operation frame 8, the other screen 10 is stretched between the take-up shaft 6 and the operation frame 8. The screen frame 1 is opened and closed by winding the two screens 9 and 10 onto the take-up shaft 6 or feeding them out from the take-up shaft 6 by the movement operation of the operation frame 8.

[0016] At this time, the take-up shaft 6 moves while winding and feeding out the screens 9 and 10. When the screens 9 and 10 are wound up and the screen frame 1 is opened, it occupies a position in contact with the left vertical frame bar 4. When the screens 9 and 10 are fed out and the screen frame 1 is closed, it occupies a position approximately in the middle of the left and right vertical frame bars 4 and 5.

[0017] Also, when the operation frame 8 pulls out the screens 9 and 10 from the winding shaft 6 to close the screen frame 1, it occupies a position where it abuts against the right vertical frame rod 5. When the screens 9 and 10 are wound around the winding shaft 6 to open the screen frame 1, it occupies a position where it abuts against the winding shaft 6 that abuts against the left vertical frame rod 4. When the screen frame 1 is closed, the operation frame 8 can be fixed to the right vertical frame rod 5 by means such as a magnet or a hook.

[0018] Among the upper and lower horizontal frame rods 2 and 3, the upper horizontal frame rod 2 is composed of a groove-shaped member with an open lower surface as shown in FIG. 2, and inside it, there are guide rails 13 and 13 that slidably support the runner portion 12 at the upper end of the winding shaft 6. The lower horizontal frame rod 3 has a flat rail shape and is configured to guide the lower end portion of the operation frame 8 and to guide a screen guide 14 that guides the lower end portion of the winding shaft 6 and the lower end portions of the screens 9 and 10.

[0019] The operation frame 8 is made movable along the lower horizontal frame rod 3 by placing a roller 15 provided at its lower end on the lower horizontal frame rod 3. The upper end portion of the operation frame 8 is guided by the front and rear side walls 2a and 2b of the upper horizontal frame rod 2 by fitting into the upper horizontal frame rod 2.

[0020] As shown in FIGS. 1 and 2, the screen guide 14 is formed by connecting a plurality of grooved guide pieces 16 made of synthetic resin in a row so as to be bendable. One end of the screen guide 14 is connected to the lower end portion of the left vertical frame rod 4, and the other end of the screen guide 14 is inserted into the operation frame 8 from the opening at the lower end of the operation frame 8 and is configured to be introduced into the operation frame 8 or led out from the operation frame 8 along the lower horizontal frame rod 3 as the operation frame 8 moves horizontally. Note that since the screen guide 14 is a known one and is commonly used in this type of roll screen device, a detailed description thereof will be omitted.

[0021] As shown in FIGS. 2 to 4, the take-up shaft 6 includes a shaft core member 18 having a runner portion 12 at its upper end that moves along the guide rails 13, 13 within the upper horizontal frame bar 2 of the screen frame 1, and a winding cylinder 19 for winding the screen, which is coupled to the shaft core member 18 so as to be relatively rotatable about the central axis L of the take-up shaft 6 and relatively displaceable in the direction along the central axis L. One end of each of the two screens 9, 10 is connected to the winding cylinder 19.

[0022] The winding cylinder 19 has a cylindrical shape, and a hollow cap 20 composed of a dish-shaped portion 20a and a cylindrical portion 20b is fixedly attached to the upper end thereof. Inside the winding cylinder 19, a spring connecting member 21 is attached at a position closer to the lower side than the vertical midpoint so as to be fixed to each other in the rotational direction with respect to the winding cylinder 19 but relatively displaceable in the direction of the central axis L.

[0023] As is apparent from FIGS. 3 and 4, the shaft core member 18 has the runner portion 12, an engagement shaft 22 having a triangular prism shape that extends downward from the lower end of the runner portion 12 and fits into the cap 20, and a cylindrical spring shaft 23 that extends downward from the lower end of the engagement shaft 22 and fits into the winding cylinder 19. One end (upper end) 7a of the torsion spring 7 is fixed to the spring shaft 23, and the other end (lower end) 7b of the torsion spring 7 is fixed to the spring connecting member 21. Thus, when the shaft core member 18 and the winding cylinder 19 are relatively rotated, the torsion spring 7 is twisted, and rotational energy for winding the screen is accumulated in the torsion spring 7.

[0024] On the outer periphery of the engaging shaft 22 and the inner periphery of the dish-shaped portion 20a of the cap 20, protrusions 24 and 25 that engage with each other in the rotational direction at an engaging position where the winding cylinder 19 is raised with respect to the shaft core member 18 (see FIG. 3) are respectively formed. By the engagement of the protrusions 24 and 25, relative rotation between the winding cylinder 19 and the shaft core member 18 is suppressed. When the winding cylinder 19 is lowered to a disengaged position (see FIG. 2) with respect to the shaft core member 18, the engagement of the protrusions 24 and 25 is released, and relative rotation between the winding cylinder 19 and the shaft core member 18 becomes possible. In the illustrated example, three protrusions 24 are formed on the outer periphery of the engaging shaft 22 at 120-degree intervals, and one rod-shaped protrusion 25 is formed on the inner periphery of the cap 20. However, the engaging shaft 22 does not necessarily have to be triangular prism-shaped, and it may be other polygonal prism-shaped or cylindrical. Also, the number and arrangement of the protrusions 24 and 25 provided on the engaging shaft 22 and the cap 20 are not limited to the illustrated example as long as they are the number and arrangement that can engage and disengage with each other when necessary.

[0025] A spring receiving portion 26 is attached to the spring shaft 23, and a compression spring 27 separate from the torsion spring 7 is interposed in a compressed state between the spring receiving portion 26 and the lower end of the cap 20. By this compression spring 27, the winding cylinder 19 is biased upward with respect to the shaft core member 18. In other words, by the compression spring 27, the shaft core member 18 is biased downward with respect to the winding cylinder 19.

[0026] As is apparent from FIG. 4, the runner portion 12 has a rectangular shape in plan view, and guide rollers 28, 28 rotatable about a vertical axis are provided at a pair of diagonal corners of the runner portion 12. When the runner portion 12 moves inside the upper horizontal frame bar 2, the guide rollers 28, 28 are configured to contact the inner surfaces of the side walls 2a, 2b of the upper horizontal frame bar 2 and be guided.

[0027] When assembling the roller screen device having the above configuration, when attaching the winding shaft 6 to the screen frame 1, the winding shaft 6 with one ends of the two screens 9 and 10 connected respectively is rotated relative to the runner portion 12 and the winding cylinder 19 to store rotational energy in the torsion spring 7. The operation is to hold the runner portion 12 and the winding cylinder 19 with both hands, and while compressing the compression spring 27 and lowering the winding cylinder 19 to a non-engagement position (see FIGS. 2 and 7) where the protrusion 25 of the cap 20 does not engage with the protrusion 24 of the engagement shaft 22, relatively rotate the winding cylinder 19 and the shaft core member 18. After that, if the runner portion 12 is released, the shaft core member 18 is pushed down by the compression spring 27 and displaced to the engagement position (see FIG. 3). In other words, since the winding cylinder 19 rises relative to the shaft core member 18, the protrusion 24 of the engagement shaft 22 engages with the protrusion 25 of the cap 20, and the relative rotation between the winding cylinder 19 and the shaft core member 18 is blocked. In this state, the winding shaft 6 is attached to the screen frame 1. Along with the attachment, the operation frame 8 is attached to the screen frame 1, the other end of one screen 9 is connected to one vertical frame rod 4, and the other end of the other screen 10 is connected to the operation frame 8.

[0028] The attachment of the winding shaft 6 to the screen frame 1 is performed as follows. That is, as shown in FIGS. 5 and 6, the runner portion 12 of the winding shaft 6 is inserted into the inside of the upper horizontal frame rod 2 from below with its longitudinal direction oriented in the longitudinal direction of the upper horizontal frame rod 2, pushed up above the guide rails 13, 13, and then the winding shaft 6 is rotated by 90 degrees. As shown in FIGS. 7 and 2, the runner portion 12 is placed on the guide rails 13, 13. After that, if the winding cylinder 19 is released, the winding cylinder 19 descends to the non-engagement position by its own weight, and the engagement of the protrusions 24 and 25 is released, so that the winding cylinder 19 becomes rotatable, and the screens 9 and 10 can be opened and closed by moving and operating the operation frame 8.

[0029] Thus, in the present invention, the accumulation of the rotational force for winding up the screen is performed by a torsion spring, and when the winding cylinder is attached to the screen frame, the winding cylinder is engaged with the shaft core member to make it non-rotatable, or after the winding cylinder is attached to the screen frame, the engagement between the winding cylinder and the shaft core member is released to make the winding cylinder rotatable. This operation is performed by a compression spring separate from the torsion spring. As a result, a spring having an appropriate elastic force can be easily selected for each application. Consequently, the attachment of the winding cylinder to the screen frame can be performed simply and reliably, and the opening and closing of the screen can be performed smoothly.

Explanation of Reference Numerals

[0030] 1 Screen frame 2 Upper horizontal frame bar 3 Lower horizontal frame bar 4 Left vertical frame bar 5 Right vertical frame bar 6 Winding shaft 7 Torsion spring 8 Operation frame 9, 10 Screen 12 Runner part 13 Guide rail 18 Shaft core member 19 Winding cylinder 20 Cap 22 Engagement shaft 23 Spring shaft 24, 25 Projection 26 Spring receiving part 27 Compression spring

Claims

1. In a roll screen device, a winding shaft having a torsion spring for generating a rotational force for winding a screen is built into a screen frame composed of upper and lower horizontal frame bars and left and right vertical frame bars, and an operation frame for opening and closing the screen are attached so as to be horizontally movable. One of the two screens is stretched between the winding shaft and one of the vertical frame bars, and the other screen is stretched between the winding shaft and the operation frame. By the movement operation of the operation frame, the two screens are wound around the winding shaft or unwound from the winding shaft. In this roll screen device, the winding shaft includes a shaft core member having a runner portion that moves within the upper horizontal frame bar of the screen frame, and a winding cylinder for winding the screen that is coupled to the shaft core member so as to be relatively rotatable about the central axis of the winding shaft and relatively vertically movable along the central axis. One end and the other end of the torsion spring are connected to the winding cylinder and the shaft core member, and a compression spring separate from the torsion spring is interposed between the winding cylinder and the shaft core member. When the shaft core member is pushed by the compression spring and descends relative to the winding cylinder, the winding cylinder engages with the shaft core member and becomes non-rotatable. When the winding cylinder descends against the compression spring due to its own weight, the engagement between the winding cylinder and the shaft core member is released and the winding cylinder becomes rotatable. A roll screen device characterized by the above.

2. A hollow cap is attached to the upper end of the winding cylinder, an engaging shaft that fits into the cap is provided on the shaft core member, and protrusions that engage with each other at a position where the winding cylinder has risen relative to the shaft core member are formed on the engaging shaft and the cap, respectively. The roll screen device according to claim 1, characterized by this.

3. A spring shaft that extends downward from the engaging shaft and fits into the winding cylinder is provided on the shaft core member, and the compression spring is interposed between a spring receiving portion provided on the spring shaft and the cap. The roll screen device according to claim 2, characterized by this.

4. The runner part has a rectangular shape in plan view and has guide rollers rotatable about a vertical axis at a pair of diagonal corners, and is inserted into the upper horizontal frame bar in a posture with the longitudinal direction of the runner part directed in the longitudinal direction of the upper horizontal frame bar, and then rotated by 90 degrees to be placed on a guide rail inside the upper horizontal frame bar, and the guide rollers are configured to contact the inner wall surface of the upper horizontal frame bar when moving inside the upper horizontal frame bar along the guide rail. The roll screen device according to any one of claims 1 to 3, characterized in that.

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