Screen device

Abstract

To improve the appearance and safety of a screen device by making the length of an operation string adjustable which hangs from a pulley by a simple means.SOLUTION: In a screen device for raising and lowering a screen 2 by rotating a screen support shaft 10 with an operation of an operation string 1, a handle 27 is attached to the lower end of the operation string 1, a stop groove 28 into which the operation string 1 is stopped in a pressed manner is formed in the handle 27, the lower part of the operation string 1 is folded upward by lifting the handle 27, and the length of the operation string 1 hanging down from a pulley 20 can be adjusted by pressing the upper part of the operation string 1 into the stop groove 28 of the handle 27 and stopping and placing the handle 27 at the position.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a screen device in which a pulley is attached to a screen support shaft that supports a screen, an operating cord is wound around the pulley, and the screen support shaft is rotated by operating the operating cord to raise and lower the screen. [Background technology]

[0002] A screen device in which a pulley is attached to a screen support shaft that suspends and supports a screen, an operating string such as a ball chain is wound around the pulley, and the screen support shaft is rotated by operating the operating string to raise and lower (open and close) the screen is well known, as disclosed in Patent Document 1, for example. In this type of screen device, the operating string typically has a loop shape or a continuous linear shape.

[0003] In the case of a looped control cord, when the screen is raised or lowered, the control cord simply moves along the loop, and the length of the control cord hanging down from the pulley does not change, but in the case of a continuous linear control cord, the length of the control cord hanging down from the pulley changes when the screen is raised or lowered, and the hanging length is at its maximum when the control cord is pulled down to raise (open) the screen. In this case, the lower end of the control cord tends to touch the floor, which not only looks unsightly, but also poses problems such as the hanging control cord getting in the way when cleaning the room and potentially becoming entangled in children's hands or feet, leading to unexpected accidents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-4536 Summary of the Invention [Problem to be solved by the invention]

[0005] A technical object of the present invention is to improve the appearance of the screen device and increase safety at the same time by making it possible to adjust the length of the operating cord hanging down from the pulley by a simple means. [Means for solving the problem]

[0006] The present invention is a screen device having a screen support shaft that supports a screen, a pulley attached to the end of the screen support shaft, and an operating cord wound around the pulley, and configured so that the screen is raised and lowered by rotating the pulley with the operating cord, which rotates the screen support shaft.The screen device has a handle attached to the lower end of the operating cord, and a retaining groove formed in the handle into which the operating cord is pushed to hold it.By lifting the handle, the lower part of the operating cord is folded upward, and in this state the upper part of the operating cord is pushed into the retaining groove of the handle to hold the handle in place, making it possible to adjust the length of the operating cord hanging down from the pulley.

[0007] In the present invention, The stop groove The holding force when the operating cord is pushed into the handle is The aforementioned Even if the weight of the folded part of the operating string acts, the handle will not come off the operating string, but the handle and the folded part of the operating string holding power When an external force exceeding this acts, the handle will come off the operating cord.

[0008] In the present invention, the handle has a truncated cone shape with a diameter at the upper end being smaller than a diameter at the lower end, Stop groove is formed on the side surface of the handle along the axis of the handle, Stop groove The groove width is equal to or less than the cord width of the operating cord. In addition, in the present invention, the handle is cylindrical, the retaining groove is formed on the side surface of the handle along the axis of the handle, and the groove width of the retaining groove is equal to or smaller than the cord width of the operating cord. [Effects of the Invention]

[0009] Even if the operating cord hangs down significantly from the pulley when the screen is closed, the length of the operating cord hanging down from the pulley can be adjusted to be shorter by folding the lower part of the operating cord upward and pushing the upper part of the operating cord into the stop groove of the handle to stop the handle in that position, thereby improving the aesthetic appearance. Also, when an external force acts on the handle or operating cord, it comes out of the closed state, so there is no risk of the operating cord getting caught on a child's body. the law of nature It won't get tangled and is safer. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partially cutaway longitudinal sectional front view of a main portion of a screen device according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is an enlarged view of a main part of FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view of the screen when it is raised by operating the operating cord from the state shown in FIG. 6. [Figure 8] FIG. 8 is a cross-sectional view of a state in which the hanging length of the operating cord has been adjusted to be shorter than the state in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the screen device according to the present invention will be described below. As shown in Figures 1 to 8, the screen device of this embodiment is a vertical-opening type screen device that opens and closes an opening in a screen frame 4 attached to a building opening 3 by raising and lowering a screen 2 by operating an operating cord 1. As shown in Figures 1 and 6, the screen 2 is in a closed state when it is lowered to cover the opening in the screen frame 4, and as shown in Figures 7 and 8, the screen 2 is in an open state when it is raised to open the opening in the screen frame 4.

[0012] The screen frame 4 has a winding box 6 extending horizontally at its upper end, a first vertical frame rod 7 extending downward from the first end, which is the left end of the winding box 6, and a second vertical frame rod 8 extending downward from the second end, which is the right end of the winding box 6.

[0013] The winding box 6 has a square cylindrical shape and has an opening at the bottom for allowing the screen 2 to extend downward, and a screen support shaft 10 to which the upper end of the screen 2 is connected is housed inside the winding box 6 so as to be rotatable about a horizontal first axis L1, and by rotating the screen support shaft 10 with the operating cord 1, the screen 2 is wound around the screen support shaft 10 to rise (open) or unwound from the screen support shaft 10 to fall (close). A first end cap 11 is attached to a first end of the winding box 6, and a second end cap 12 is attached to a second end of the winding box 6. The first end cap 11 rotatably supports one end of the screen support shaft 10, and a rotation transmission mechanism 13 is disposed inside the second end cap 12 to transmit the operating force of the operating cord 1 to the screen support shaft 10 as a rotational force.

[0014] The screen 2 moves up and down with its left and right side edges guided by the first vertical frame rod 7 and the second vertical frame rod 8. One of a pair of interlocking tapes constituting a slide fastener is attached along the left and right side edges of the screen 2. The interlocking tape 14 has a tape base 14a with many interlocking teeth 14b attached to the end of the tape base 14a. As shown in FIG. 2, the interlocking teeth 14b of the interlocking tape 14 slidably engage with slits 15a of inner rails 15 inserted inside the first vertical frame rod 7 and the second vertical frame rod 8, respectively. This prevents the left and right side edges of the screen 2 from coming off the first vertical frame rod 7 and the second vertical frame rod 8 even when wind pressure or the like acts on the screen 2. A movable crosspiece 16, which also serves as a weight, is attached to the lower end of the screen 2. When the screen 2 is closed, the weight of the movable crosspiece 16 causes the screen 2 to descend.

[0015] As is clear from Figures 1, 3 and 5, the rotation transmission mechanism 13 has an internal gear-shaped pulley 20 supported inside the second end cap 12 so as to be rotatable around a second axis L2 parallel to the first axis L1, and a spur gear 21 that meshes with the internal teeth 20a of the pulley 20 on the first axis L1, with the operating cord 1 wound around the pulley 20 and the spur gear 21 attached to the end of the screen support shaft 10, so that when the pulley 20 is rotated with the operating cord 1, the spur gear 21 rotates, causing the screen support shaft 10 to rotate.

[0016] Specifically, when the operating cord 1 is pulled down, in FIG. 3, the pulley 20 and spur gear 21 (and therefore the screen support shaft 10) rotate counterclockwise, causing the screen support shaft 10 to wind up the screen 2, thereby releasing the screen 2 as shown in FIG. 7. When the operating cord 1 is loosened, the weight of the movable crosspiece 16 causes the screen 2 to descend, causing the screen support shaft 10 (and therefore the spur gear 21) and pulley 20 to rotate clockwise, closing the screen 2 and lifting the operating side portion 1A of the operating cord 1 as shown in FIG. 6. In this case, because the number of teeth of the internal teeth 20a of the pulley 20 is greater than the number of teeth of the spur gear 21, the rotation speed of the spur gear 21 (and therefore the screen support shaft 10) when opening or closing the screen 2 is greater than the rotation speed of the pulley 20. Therefore, it can be said that the pulley 20 and the spur gear 21 constitute a speed change mechanism for increasing the rotation speed of the screen support shaft 10.

[0017] The operating cord 1 is made of a ball chain and is formed by attaching a large number of balls 24 at regular intervals to a series of flexible wires 23, and has a first end 1a and a second end 1b on the opposite side thereof, and is wound around the pulley 20 so that the portion on the side of the first end 1a hangs down on the front side of the pulley 20 as the operating side portion 1A and the portion on the side of the second end 1b hangs down on the rear side of the pulley 20 as the driven side portion 1B, an operating handle 27 is attached to the first end 1a of the operating cord 1, and the second end 1b of the operating cord 1 is introduced inside the second vertical frame rod 8. Therefore, when the handle 27 is moved up and down to open or close the screen 2, the operating side portion 1A of the operating cord 1 hangs down from the pulley 20 outside the second vertical frame rod 8, and the driven side portion 1B of the operating cord 1 hangs down on the No. 2 It moves up and down inside the vertical frame rod 8.

[0018] In addition, the second end cap 12 is formed with an outlet for leading out the operating side portion 1A of the operating cord 1 downward, and a locking groove is formed on the edge of the outlet, into which a ball 24 can be locked by inserting the wire 23 portion of the operating cord 1.When the screen 2 is open, the operating cord 1 is inserted into this locking groove and the ball is locked on the groove edge of the locking groove, so that the screen 2 can be held in any open position against the load of the movable crosspiece 16.

[0019] The handle 27 may have any shape as long as it is easy to grip with one hand, such as a cylindrical or polygonal prism shape, but preferably has a truncated cone shape with the diameter of the upper end 27a being smaller than the diameter of the lower end 27b, as shown in Figures 6 to 8.

[0020] When the handle 27 is pulled down to fully open the screen 2, the operating side portion 1A of the operating cord 1 hangs down from the pulley 20 as shown in FIG. 7. To prevent this long hanging operating side portion 1A from interfering with cleaning or the movement of people or spoiling the appearance, a stop groove 28 is formed on the side of the handle 27 as a means for adjusting the length of the operating cord 1. As shown in FIG. 8, by lifting the handle 27, the lower end 1Aa of the operating side portion 1A of the operating cord 1 is folded back upward, and in this state, the lower end 1Aa is inserted into the stop groove 28. The aforementioned By pushing in the upper part of the operating side part 1A of the operating cord 1 and holding the handle 27 in that position (adjustment position), the length of the operating cord 1 hanging down from the pulley 20 can be adjusted to be shorter.

[0021] The retaining groove 28 is formed over the entire length of the handle 27, and the length of the retaining groove 28 is a length that spans over the plurality of balls 24 (preferably 3-4 balls) of the operating cord 1. The groove width of the retaining groove 28 is equal to or slightly smaller than the width of the balls 24, and the depth of the retaining groove 28 is smaller than the radius of the cross section of the handle 27. As a result, the handle 27 is held in the adjusted position by the frictional force between the plurality of balls 24 press-fitted into the retaining groove 28 and the groove wall of the retaining groove 28. The retaining force at this time is large enough that the handle 27 will not come off the operating cord 1 even when the weight of the handle 27 and the folded-back lower end 1Aa of the operating cord 1 acts on the handle 27, but that the handle 27 will easily come off the operating cord 1 when an external force greater than the retaining force acts on the handle 27 and the lower end 1Aa of the operating cord 1. Therefore, when adjusting the length of the operating cord 1, the operating side portion 1A of the operating cord 1 is folded back to form a loop, and even if a child or the like touches this portion, the handle 27 will come off the operating cord 1 and the operating cord 1 will not get caught on the child's body. the law of nature It won't get tangled and is extremely safe.

[0022] In the above embodiment, a ball chain is used as the operating cord 1, but the operating cord 1 may be something other than a ball chain, for example, a rope-like cord formed by bundling or combining wires. In this case, the width of the retaining groove formed in the handle is set to a size that allows a part of the rope-like operating cord to be press-fitted. Furthermore, the screen device of the above embodiment is a roll screen device that raises and lowers a screen 2 such as an insect net by winding it onto the screen support shaft 10 and unwinding it from the screen support shaft 10, but the present invention can also be applied to a honeycomb screen device that raises and lowers a honeycomb structure screen by winding a suspension cord that supports the screen onto the screen support shaft and unwinding it from the screen support shaft. [Explanation of symbols]

[0023] 1 Operating cord 2 screens 10 Screen support shaft 20 pulleys 27 Handle 27a Upper end 27b Bottom end 28 Stop groove

Claims

1. A screen device having a screen support shaft for supporting a screen, a pulley attached to the end of the screen support shaft, and an operating cord wound around the pulley, wherein the screen support shaft is rotated by operating the pulley with the operating cord to rotate the pulley, thereby raising and lowering the screen, A handle is attached to the lower end of the operating cord, and a retaining groove is formed in the handle to push the operating cord into and secure it. By lifting the handle, the lower part of the operating cord is folded upward, and in this state, the upper part of the operating cord is pushed into the retaining groove of the handle to secure the handle in that position, thereby making it possible to adjust the length of the operating cord hanging down from the pulley. A screen device characterized by:

2. The holding force when the operating cord is pushed into the stop groove of the handle is such that the handle will not come off the operating cord even when the weight of the handle and the folded-back portion of the operating cord acts on the handle, but the handle will come off the operating cord when an external force greater than the holding force acts on the handle and the folded-back portion of the operating cord.

2. The screen device according to claim 1.

3. The handle has a truncated cone shape with a diameter at an upper end smaller than a diameter at a lower end, The locking groove is formed on the side surface of the handle along the axis of the handle, and the width of the locking groove is equal to or less than the width of the operating cord.

3. The screen device according to claim 1, wherein the first and second projections are arranged parallel to each other.

4. The handle is cylindrical, The locking groove is formed on the side surface of the handle along the axis of the handle, and the width of the locking groove is equal to or less than the width of the operating cord.

3. The screen device according to claim 1, wherein the first and second projections are arranged parallel to each other.

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