JP2005023682A - Winding type screen device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a screen from being wound around a winding shaft in a wrong direction, that is, in the reverse direction, by using a simple structure. <P>SOLUTION: In a winding type screen device, the winding shaft, around which the screen is wound, is rotatably supported by a driving cap and a bearing cap, which are provided at both ends of a screen box, and the driving cap is provided with a driving means for normally and reversely rotating the winding shaft through a manual operation, so that the screen can be paid out and wound. The winding type screen device is provided with a mechanism for preventing the reverse winding of the screen, which blocks a driving force in the pay-out direction of the screen while transferring only a driving force, generated by the operation of the driving means, in the winding direction of the screen to the winding shaft, after the screen is wholly paid out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to various types of winding screen devices such as a blindfold screen, a light shielding screen, a heat insulation screen, and a roll screen door for insect protection installed in a building opening.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a take-up type screen device that operates an operating string to draw out or wind up a screen is generally well known without mentioning an example. In this type of screen device, generally, a pulley member connected to a winding shaft of the screen is rotated forward and backward by operating an operation member such as an operating string or a chain, thereby rotating the winding shaft, and feeding out the screen. Or it is taking up.
However, in this type of conventional screen device, the pulley member and the take-up shaft can normally be freely rotated in the forward and reverse directions by the operation member, so that the operation member is operated when the screen is fully extended. When the operation member is further operated without stopping, the winding shaft is wound in the wrong direction, that is, the screen is wound in the reverse direction. As a result, the screen is forcibly taken up and the screen may be damaged, and the screen device itself may be damaged.
[0003]
[Problems to be solved by the invention]
In view of the above, the technical problem of the present invention is to provide a winding screen device that can prevent the screen from being wound in the wrong direction on the winding shaft, that is, reversely wound, with a simple structure. There is.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention supports a winding shaft around which a screen is wound with a drive cap and a bearing cap provided at both ends of the screen box, and forward and reverse rotation of the winding shaft on the drive cap by manual operation. In the take-up type screen device that allows the screen to be unwound and taken up by providing the drive means, when the take-up shaft is driven in the take-up direction of the screen, the take-up shaft is driven by the drive means. The drive force is transmitted to the shaft, but when the take-up shaft is driven in the screen feed direction, the weight of the bottom bar does not act on the screen as the feed direction rotational force after the screen is fully fed, or by reverse winding of the screen. When the weight of the bottom bar becomes the resistance force of the rotary drive of the winding shaft, transmission of the driving force is cut off Now, it is characterized in that it has attached a screen counter-wound prevention mechanism.
[0005]
In a preferred embodiment of the winding screen device of the present invention, the reverse winding prevention mechanism of the screen is configured by interposing a ratchet between the transmission shaft and the winding shaft in the driving means, and the ratchet and winding When the drive shaft is driven in the screen winding direction, the ratchet engages with the take-up shaft regardless of whether the transmission shaft rotates forward or backward. When the transmission protrusion on the transmission shaft and the engagement protrusion on the ratchet are always engaged, and the winding shaft is driven in the screen feeding direction, the weight of the bottom bar acts as a rotational rotational force on the winding shaft via the screen. When the weight of the bottom bar becomes the resistance force of the rotational drive of the winding shaft due to the reverse winding of the screen, the transmission projection on the transmission shaft It is possible to configure so that the engagement with the engagement protrusion in the belt is released, and the reverse rotation prevention mechanism for the screen is fitted to the end of the take-up shaft. An opening is formed in the peripheral surface, and a ratchet formed in a substantially C shape by cutting off a part of the cylinder having the same diameter as the fitting portion of the shaft cap is fitted into the opening. A flexible shaft having a smaller diameter than the other circumferential surfaces is formed at both circumferential ends of the ratchet, and the flexible shaft is formed on the inner circumferential surface of the flexible portion. An engaging protrusion is formed, and is engaged with the engaging protrusion of the ratchet when the winding shaft is rotated in the winding direction of the screen by operating the driving means at the tip of the transmission shaft of the transmission member. To transmit the driving force in the winding direction of the screen. When the take-up shaft is rotated in the screen feed direction, the weight of the bottom bar does not act as a feed direction rotational force on the take-up shaft through the screen after the screen is fully fed, or the bottom bar is wound by reverse winding of the screen. When the weight of the winding shaft becomes the resistance to the rotational drive of the take-up shaft, the engaging protrusion of the ratchet is pressed in the direction in which the flexible portion bends in the diameter expansion direction, causing the transmission member to idle, It can be set as the structure which formed the transmission protrusion which interrupts | blocks the driving force of a direction.
In this case, the ratchet can be reversely mounted by reversing its direction, and the engagement protrusion in the ratchet can be configured so that the winding shaft is in the winding direction of the screen. The portion where the transmission projection engages when rotating is the opposing surface facing the transmission projection, and the portion with which the transmission projection engages when the take-up shaft rotates in the screen feed-out direction is due to the transmission projection. By deforming the flexible portion by pressing, the slope can be released.
[0006]
Furthermore, the bottom bar attached to the tip of the screen can be provided with a weight for applying a feeding direction rotational force to the take-up shaft through the screen.
[0007]
The take-up screen device having the above-described configuration transmits a driving force to the take-up shaft when the take-up shaft is driven in the screen take-up direction, but the take-up shaft is driven in the screen feed direction. Drives when the weight of the bottom bar does not act on the screen as a rotational force in the feeding direction after the screen is fully extended, or when the weight of the bottom bar becomes the resistance force of the rotary drive of the take-up shaft due to the reverse winding of the screen. Cut off power transmission. Therefore, after the screen has been fully fed, the winding shaft can be rotated in the screen winding direction by operating the driving means, but the driving force in the screen feeding direction is not transmitted to the winding shaft. It is possible to prevent the winding shaft from being wound in the wrong direction, that is, reverse winding, and thus to prevent the screen or the screen device itself from being damaged.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show an embodiment in which the winding screen device of the present invention is applied to an insect screen.
As shown in FIGS. 1 and 2, the insect screen has a screen box 2 mounted along an upper frame member (not shown) of a building opening, and a winding supported rotatably inside the box 2. A shaft 4, an insect repellent net 7 that forms a screen wound around the winding shaft 4 and whose tip is led out from the slit 6 on the lower surface of the box 2, and a bottom bar 8 attached to the tip of the net 7 A pair of left and right guide rails 9 that are vertically provided downward from both ends of the box 2 and that slidably guide the left and right ends of the net 7 and the bottom bar 8 when the net 7 is opened and closed. By operating an operating string 18 that constitutes a part of drive means 17 provided on the drive cap 12 to be described later and rotating the take-up shaft 4 forward and backward, the net 7 is drawn out and taken up. So that possible.
[0009]
As shown in FIG. 1, the screen box 2 has a bearing cap 11 and a driving cap 12, each of which includes end covers 13 and 14 and main bodies 15 and 16, attached to the left and right ends, respectively. The winding shaft 4 is rotatable by shaft caps 20, 22 fitted to both ends of the winding shaft 4 on shaft support portions 15 a, 16 a protruding from the surfaces facing the inside of the box 2 of the main bodies 15 and 16. I support it. Further, a slit 6 is provided on the lower surface of the box 2 for leading out the net 7 wound around the winding shaft 4 (see FIG. 2).
[0010]
A drive cap 12 attached to one end (right end side in FIG. 1) of the box 2 is provided with drive means 17 for rotating the winding shaft 4 forward and backward. The driving means 17 is configured by rotatably supporting a pulley 24 having a built-in one-way clutch mechanism around which an operating string 18 as an operating means for feeding or winding the net 7 is wound. The driving means 17 in the drive cap 12 transmits a driving force to the winding shaft 4 when the winding shaft 4 is driven in the winding direction of the net 7. 7, when the net 7 is driven in the unwinding direction, the weight of the bottom bar 8 does not act on the net 7 as a rotating force in the unwinding direction after the net 7 is fully unrolled, or the weight of the bottom bar 8 is wound by reverse winding of the net 7. A reverse-winding prevention mechanism for the net 7 is provided, which interrupts transmission of the driving force when the rotational force of the shaft 4 becomes resistance.
A one-way clutch mechanism is also accommodated inside the end cap 14 of the drive cap 12, and a clutch cylinder 12 a forming a part of the clutch mechanism is integrally formed on the inner surface side of the end cap 14.
[0011]
The reverse winding prevention mechanism of the net 7 will be described in more detail. The reverse winding prevention mechanism is, as shown in detail in FIG. 3, the fitting portion of the shaft cap 22 fitted to the end portion of the winding shaft 4. An opening 22b is formed on the circumferential surface of 22a, and a ratchet 26 formed in a substantially C shape by cutting a part of a cylinder having the same diameter as the fitting portion 22a of the shaft cap 22 is formed in the opening 22b. The shaft cap 22 is configured by fitting and inserting the transmission shaft 28a of the transmission member 28 for transmitting the driving force for winding the net 7 by the operation of the driving means 17 to the winding cap 4. Yes.
[0012]
The ratchet 26 is formed with flexible portions 26a which are smaller in diameter than the other peripheral surfaces and elastically flexible at both peripheral ends, and engaging protrusions 26b on the inner peripheral surface of the flexible portion 26a. In addition, a transmission protrusion 28b that engages with the engagement protrusion 26b is formed on the peripheral surface of the transmission shaft 28a of the transmission member 28.
The engagement protrusion 26b in the ratchet 26 is used when the winding shaft 4 is rotated in the winding direction of the net 7 as clearly shown in FIGS. 4A and 4B (see FIG. 4A). ) Is a facing surface 26c facing the transmission projection 28b, while the winding shaft 4 is rotated in the net 7 feeding direction (see FIG. 4B). The portion where the transmission projection 28b engages is a slope 26d that is disengaged by deforming the flexible portion 26a by pressing by the contact of the transmission projection 28b.
[0013]
That is, the transmission projection 28b engages with the engagement protrusion 26b of the ratchet 26 when the winding shaft 4 is rotated in the winding direction of the net 7 by the operation of the driving means 17, and the winding of the net 7 is performed. The driving force in the take-off direction can be transmitted. On the other hand, when the take-up shaft 4 is rotated in the feed-out direction of the net 7 by the operation of the drive means 17, the weight of the bottom bar 8 after the net 7 is fully drawn out. Does not act on the take-up shaft 4 via the net 7 as a feeding direction rotational force, or when the weight of the bottom bar 8 becomes a resistance force of the rotational drive of the take-up shaft 4 due to the start of reverse winding of the net 7. The engagement protrusion 26b of the ratchet 26 is pressed in the direction in which the flexible portion 26a bends in the diameter increasing direction, causing the transmission member 28 to idle, so that the driving force in the feeding direction of the net 7 is cut off. It is. Therefore, the flexible portion 26a needs to have elastic flexibility necessary for the above operation.
[0014]
The one-way clutch mechanism in the drive cap 12 prevents the transmission member 28 from rotating due to the rotational force from the winding shaft 4 side, but the rotational force due to the operation of the operation string 18 in the drive means 17 The net 7 can be transmitted to the take-up shaft 4 for taking up or unwinding the net 7 through 28.
[0015]
The configuration of the one-way clutch mechanism will be described. A clutch spring 30 that is urged in the diameter-reducing direction and pressed against the surface of the clutch cylinder 12a is applied to the clutch cylinder 12a provided on the inner surface of the end cap 14 of the drive cap 12. Are formed, and outwardly bent portions (not shown) facing each other are formed at both ends of the clutch spring 30. On the other hand, the base end of the transmission shaft 28a of the transmission member 28 protrudes around the inner cylinder portion 28e rotatably supported in the clutch cylinder 12a and the clutch spring 30 wound around the clutch cylinder 12a. An outer cylinder part 28c having a notch part 28d is provided in a part of the periphery, and the pulley 24 is rotatably fitted to a circumferential surface around the outer cylinder part 28c, and protrudes to the inner surface of the pulley 24. The provided engaging convex portion 24a is inserted into the cutout portion 28d with a sufficient gap therebetween.
[0016]
The pair of bent portions of the clutch spring 30 are positioned on both sides of the engaging convex portion 24a projecting from the pulley 24 in the cutout portion 28d of the outer cylinder portion 28c. The clutch spring 30 is urged in the diameter reducing direction around the clutch cylinder 12 a, but the direction in which the engagement convex portion 24 a pushes one of the pair of bent portions of the clutch spring 30 by the rotation of the pulley 24 is the same. In this direction, the winding diameter of the clutch spring 30 is increased and the winding around the clutch cylinder 12a is released.
[0017]
Therefore, when the pulley 24 in the clutch mechanism is rotated in either direction, the engagement convex portion 24a provided on the inner surface of the pulley 24 is engaged with one of the bent portions 30a at both ends of the clutch spring 30. The bent portion 30a is moved in the direction in which the winding diameter of the clutch spring 30 is increased. Therefore, the frictional force between the clutch spring 30 and the clutch cylinder 12a is reduced, and the pulley 24 rotates while pressing the outer cylinder part 28c of the base part of the transmission shaft 28a by the engagement convex part 24a. It is transmitted to the transmission shaft 28 a and transmitted to the winding shaft 4 via the ratchet 26.
However, even if a rotational force acts on the transmission shaft 28 a by a rotational force from the winding shaft 4, the inner side surface of the notch portion 28 d in the outer cylindrical portion 28 c of the transmission shaft base portion is a pair of bent portions of the clutch spring 30. The direction in which any one of 30a is pushed is the direction in which the winding diameter of the clutch spring 30 is reduced to increase the winding around the clutch cylinder 12a, so that the transmission shaft 28a is fixed to the end cover 14 in the drive cap 12 and is wound up. The shaft 4 does not rotate, that is, the net 7 is not drawn out.
[0018]
Reference numeral 32 in FIGS. 1 and 2 denotes a weight attached to the bottom bar 8 attached to the tip of the net 7, and this weight 32 applies tension to the net 7 that is fed out, and the net 7. For applying a feeding direction rotational force to the take-up shaft 4 via The weight 32 need not be provided if the bottom bar itself has a necessary weight.
[0019]
The take-up screen device having the above-described configuration transmits a driving force to the take-up shaft 4 when the take-up shaft 4 is driven in the take-up direction of the net 7. In the case of driving in the direction, the weight of the bottom bar 8 does not act as a rotational force in the feeding direction on the net 7 after the net 7 is fully fed, or the weight of the bottom bar 8 is reduced by the reverse winding of the net 7. The transmission of the driving force is cut off when the rotational driving resistance is reached. Therefore, after the net 7 is fully extended, the winding shaft 4 can be rotated in the winding direction of the net 7 by operating the driving means 17, but the driving force in the net 7 feeding direction is transmitted to the winding shaft 4. Therefore, the net 7 can be prevented from being wound around the winding shaft 4 in the wrong direction, that is, reversely wound, and the damage to the net 7 or the screen device itself can be suppressed.
[0020]
As shown in FIGS. 3 and 5, the ratchet 26 is related to the mechanism for preventing the reverse rotation of the drive cap 12 and the net 7 by fitting the ratchet 26 upside down (reference numeral 26 'in the figure). The structure is configured to perform reverse transmission. Since the structure and operation of the ratchet 26 'are the same as those of the ratchet 26, the reference numeral is indicated by "'" and the description thereof is omitted.
In the above-described embodiments, the case where the structure related to the drive cap 12 and the reverse winding prevention mechanism of the net 7 is provided on the right side of the screen box 2 is described. However, it can be provided on the left side of the screen box 2 as necessary. In this case, the fact that the ratchet 26 can be reversed is effective in that the parts can be shared.
[0021]
【The invention's effect】
As described in detail above, the winding screen device of the present invention transmits a driving force to the winding shaft when the winding shaft is driven in the winding direction of the screen. When the screen is driven in the unwinding direction, the weight of the bottom bar does not act on the screen as a rotational force in the unwinding direction after the entire screen is unfolded, or the weight of the bottom bar becomes the resistance of the rotational drive of the winding shaft due to reverse winding of the screen The transmission of driving force is cut off when it becomes force. Therefore, after the screen is fully fed, the winding shaft can be rotated in the screen winding direction by operating the driving means. However, since the driving force in the screen feeding direction is not transmitted to the winding shaft, the screen is wound. It is possible to prevent the winding shaft from being wound in the wrong direction, that is, reverse winding, and thus to prevent the screen or the screen device itself from being damaged.
Thus, according to the winding screen device of the present invention, it is possible to prevent reverse winding of the screen with a simple structure.
[Brief description of the drawings]
FIG. 1 is a partially broken front view of an embodiment of a winding screen device according to the present invention.
FIG. 2 is a cross-sectional side view of the same.
FIG. 3 is an exploded perspective view showing a structure of a reverse winding prevention mechanism for a screen.
4A and 4B are cross-sectional views of a screen reverse winding prevention mechanism, in which FIG. 4A shows a state when the transmission shaft is driven in the screen winding direction, and FIG. 4B shows a state when the transmission shaft is driven in the direction of feeding the screen. It shows the state.
5A and 5B are cross-sectional views similar to FIG. 4 when the ratchet in the reverse winding prevention mechanism is reversed.
[Explanation of symbols]
2 Screen box 4 Winding shaft 7 Net 8 Bottom bar 11 Bearing cap 12 Drive cap 17 Drive means 20, 22 Shaft cap 22a Fit portion 22b Opening portion 26, 26 'Ratchet 26a, 26a' Flexible portion 26b, 26b 'Engagement Protrusions 26c, 26c 'Opposing surfaces 26d, 26d' Slope 28 Transmission member 28a Transmission shaft 28b Transmission projection 32 Weight

Claims (6)

The winding shaft around which the screen is wound is supported by drive caps and bearing caps provided at both ends of the screen box, and the driving cap is provided with driving means for rotating the winding shaft forward and backward by manual operation. In the take-up type screen device that enables feeding and winding,
When the winding shaft is driven in the winding direction of the screen, the driving force is transmitted to the winding means. However, when the winding shaft is driven in the screen feeding direction, the entire screen is driven. When the weight of the bottom bar does not act on the screen as a rotational force in the feeding direction after feeding, or when the weight of the bottom bar becomes the resistance force of the rotary drive of the take-up shaft due to reverse winding of the screen, With a reverse-winding prevention mechanism for the screen,
A roll-up screen device characterized by that. The reverse winding prevention mechanism of the screen is configured by interposing a ratchet between the transmission shaft and the winding shaft in the driving means,
Between the ratchet and the take-up shaft, the ratchet engages the take-up shaft regardless of the forward / reverse rotation of the transmission shaft,
Between the transmission shaft and the ratchet, when the winding shaft is driven in the screen winding direction, the transmission projection on the transmission shaft and the engaging projection on the ratchet are always engaged, and the winding shaft is in the direction of feeding the screen. In the case of driving, the weight of the bottom bar does not act as a rotational force on the take-up shaft via the screen, or the weight of the bottom bar becomes a resistance force for the rotational drive of the take-up shaft due to reverse winding of the screen. When the transmission projection on the transmission shaft is disengaged from the engagement protrusion in the ratchet and idles,
The winding screen device according to claim 1. The reverse winding prevention mechanism for the screen is provided with an opening in the peripheral surface of the fitting portion of the shaft cap that is fitted to the end of the take-up shaft, and a cylinder having substantially the same diameter as the fitting portion of the shaft cap in the opening. A ratchet formed in a substantially C shape by cutting off a part of the shaft, and configured by inserting and inserting a transmission shaft of the driving means into the shaft cap,
A flexible portion having a smaller diameter than that of the other peripheral surface and a flexible portion is formed on both peripheral ends of the ratchet, and an engaging protrusion is formed on the inner peripheral surface of the flexible portion,
When the winding shaft is rotated in the winding direction of the screen by the operation of the driving means at the tip of the transmission shaft of the transmission member, the engaging member is engaged with the engaging protrusion of the ratchet in the winding direction of the screen. The driving force is transmitted, but when the take-up shaft is rotated in the drawing direction of the screen by operating the driving means, the weight of the bottom bar is applied to the take-up shaft via the screen after the whole drawing of the screen. When the weight of the bottom bar becomes the resistance force of the rotational drive of the take-up shaft due to the reverse winding of the screen, the engagement protrusion of the ratchet is bent in the direction in which the flexible portion bends in the diameter increasing direction. Pressed to idle the transmission member, and formed a transmission projection that cut off the driving force in the screen feeding direction,
The winding screen device according to claim 1. The take-up screen device according to claim 3, wherein a reverse transmission operation is performed by mounting the ratchet with its direction reversed. The engaging protrusions in the ratchet have a portion where the transmission projection engages when the winding shaft is rotated in the screen winding direction as an opposing surface facing the transmission projection, and the winding shaft is in the screen feeding direction. 5. A portion where the transmission protrusion engages when rotating is a slope on which the engagement is released by deforming the flexible portion by pressing with the transmission protrusion. Roll-up screen device. The take-up screen device according to any one of claims 2 to 5, wherein a weight for applying a feeding direction rotational force to the take-up shaft is attached to the bottom bar attached to the tip of the screen.

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