JP2008013950A - Light control member lifting device for window - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for lifting a light control member for windows such as pleat screens capable of performing manual operations for directly lifting up and down a light control member and an operation for pulling a cord, having excellent aesthetic appearance, and preventing an undue load from being applied to a worker when the light control member is lifted. <P>SOLUTION: A lowering cord drum 14 around which an operation cord 6 for lowering is wrapped and a rising cord drum 13 around which an operation cord 5 for rising is wrapped are disposed coaxially with the drum 10 for winding a spring. A ratchet mechanism 33 is interposed between the drum 10 for winding the spring and the rising cord drum 13 and the lowering cord drum 14. When one of the operation cords 5, 6 is pulled, the ratchet mechanism 33 selectively engages one of the rising cord drum 13 and the lowering cord drum 14 with the drum 10 for winding the spring to integrally rotate the drum 10 for winding the spring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  This invention lifts and lowers the light control member for windows, such as a roman shade, a pleat screen, a roll screen, and a blind, and also has the function to hold | maintain a light control member in arbitrary open positions and closed positions. Relates to the device.

  In a dimming member lifting device for a window that lifts and lowers a dimming member such as a roman shade or a pleated screen used for dimming on the indoor side of a building window, the dimming member is mounted using a constant load spring mechanism. A device that is held at an arbitrary open position or closed position is known (for example, see Patent Document 1 or 2).

Among these, in Patent Document 1, a first pulley and a second pulley are pivotally supported on a pair of pivots projecting from a head box, and an upper ring-shaped cord groove and a lower portion are respectively provided on the first pulley and the second pulley. A ring-like groove on the side, and a connecting cord made of a twin-cored wire that has a terminal portion separated from each other and fixed to the bottom rail via a light-modulating member in the upper-side ring-shaped groove. The ring-shaped groove has an S-shaped spring member having a first spring portion and a second spring portion.
In Patent Document 2, a constant load spring mechanism is attached to an operating shaft that raises the light control member, and a chain wheel is fixed to the operating shaft or a driving shaft connected to the operating shaft via a bevel gear. Endless chain is wrapped around the wheel.

In Patent Literatures 1 and 2, the light control member and the spring force of the leaf spring of the constant load spring mechanism are balanced, and the light control member is manually operated by lowering or pushing up the bottom rail attached to the lower end of the light control member. Can be held at any open position, and in Patent Document 2, in addition to the operation of directly gripping the light control member by hand, it can be operated by a chain suspended from the operating shaft or the drive shaft. Yes.
JP 2005-226226 A JP 54-38648 A

However, even if the windows of the building are at a height that is easy to sweep out, such as a sweep window or waist window, the elderly or children may not be able to reach the light control members attached to these windows. In the case of a skylight or a skylight, the window light-adjusting member elevating device disclosed in Patent Document 1 cannot be used because it is at a height that is normally out of reach of the householder.
On the other hand, in the dimming member elevating device for windows of Patent Document 2, it is possible to raise and lower the dimming member by extending the chain to a reachable height regardless of the installation height of the window. In the technique of Patent Document 2, members such as a constant load spring mechanism, an operation shaft, a drive shaft, a chain wheel, and an endless chain are directly connected, and even when the bottom rail of the light control member is directly lowered or pushed up by hand, it is endless. Since the chain rotates in conjunction with it, not only the appearance is remarkably impaired, but also a heavy load is applied to the operator who operates the bottom rail, which is not preferable.

  The present invention has been made in the background of such circumstances, and the purpose of the present invention is to perform both the manual operation for directly raising and lowering the light control member by hand and the pulling cord operation, and it has a good appearance and is suitable for the operator. An object of the present invention is to provide a dimming member elevating device for a window that has no burden.

  In accordance with the above-mentioned object, the invention of claim 1 is a constant load in which a leaf spring is wound between a pair of spring winding drums on a head box that suspends a light control member for windows such as a pleated screen. A dimming member for a window is moved up and down by a spring mechanism, and a spring force of a leaf spring of a constant load spring mechanism is applied to the dimming member to hold the dimming member at an arbitrary open position or closed position. In the apparatus, the pair of spring winding drums includes a lowering cord drum wound with the lowering operation cord of the light control member, and a rising cord drum similarly wound with the operation cord for raising the light control member. One of the operating cord for raising and the operating cord for lowering is disposed between the one spring winding drum, the raising cord drum, and the lowering cord drum. Tow up A ratchet mechanism in which a cord drum and a descending cord drum are selectively engaged with one of the spring winding drums to rotate the ascending cord drum or the descending cord drum integrally with the one spring winding drum It is characterized by interposing.

  The ascending cord drum and the descending cord drum are normally disengaged from one of the spring winding drums. When the bottom rail at the lower end of the light control member is directly raised and lowered manually, Does not work with the drum. Therefore, since an extra load is not given to the operator who operates manually, it is excellent in workability. Further, when either one of the ascending operation cord or the descending operation cord is pulled, either the ascending cord drum or the descending cord drum connected to the operation cord is connected to one of the spring winding drums via the ratchet mechanism. The drum is engaged, and the drum is raised or lowered in conjunction with one of the spring winding drums.

The invention of claim 2 is characterized in that, in the invention of claim 1, the rotation of the ascending cord drum and the descending cord drum associated with one spring winding drum is set in opposite directions.
In the present invention, in order to switch between engagement and disengagement of one spring winding drum and the rising or lowering cord drum by using a ratchet which is a one-way tooth, a lifting cord drum interlocked with one spring winding drum, The lowering cord drums rotate in opposite directions.

According to a third aspect of the present invention, in the first or second aspect of the invention, the ascending operation cord or the descending operation cord is pulled by a predetermined stroke on each of the ascending cord drum and the descending cord drum, and then released. In this case, rewinding means for rewinding the ascending operation cord or the descending operation cord to the ascending cord drum or the descending cord drum is connected to the ascending stroke.
In the rewinding means of the present invention, an elastic member such as a coil spring or a spiral spring is used, and is stretched between the head box and the ascending cord drum and between the head box and the descending cord drum. .

  These rewinding means pull either one of the ascending operation cord or the descending operation cord by a predetermined stroke, and either the ascending cord drum or the descending cord drum is linked with one of the spring winding drums. When the dimming member is raised or lowered, one of the ascending cord drum and the descending cord drum connected to the operated side extends the traction stroke. When the pulled operation cord is released, the extended rewinding means is reduced and returned to the no-load state, and either the ascending drum or the descending cord drum connected to the rewinding means is operated in the opposite direction to the operation. As a result, the operation cord pulled is wound up upward by an amount equivalent to the traction stroke, and returns to the non-traction state.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the light control member is positioned at the lowest limit on the lowering drum, and further when the lowering operation cord is pulled, A stopper mechanism for preventing the lowering drum from rotating is provided.
According to this configuration, when the lowering operation cord is further pulled after the light control member is positioned at the lowest limit, the stopper mechanism prevents the lowering drum from rotating, so that the light control member is connected to the light control member. The hanging strap does not sag inside the head box. As a result, stable performance can be exhibited well over a long period of time.

According to the light control member elevating device for a window according to the present invention, both the manual operation for directly raising and lowering the bottom rail at the lower end of the light control member and the pulling cord operation can be performed, and the light control member is manually operated by the intervention of the ratchet device. Even if it is lowered or pushed up directly, the operation code is not interlocked, so it looks good. Furthermore, since an operator does not give a mischievous load when raising and lowering the light control member, an easy operation without requiring force is sufficient.
Further, since the rotation of the ascending cord drum and the descending cord drum associated with one spring winding drum is set in the opposite directions, a compact ratchet device in which the number of parts is omitted can be configured. Furthermore, the head box can be restrained to an existing size by winding the suspension string connected to the light control member coaxially with either one of the pair of spring winding drums.

In addition, when the ascending operation code or the descending operation code is pulled to a predetermined stroke on the ascending cord drum and the descending cord drum and then released, the ascending operation code or the descending operation code is equivalent to the towing stroke. By connecting the rewinding means that rewinds the minute code to the ascending cord drum or descending cord drum, the cord operation repeats the operation of pulling and releasing the traction, so each operation code is different from the endless type. Can be as short as necessary.
Furthermore, since the lowering drum is provided with a stopper mechanism that prevents the lowering drum from rotating, even if the lowering operation cord is pulled more than necessary, the stopper mechanism prevents the lowering drum from rotating. Since it does not sag inside the head box, a stable lifting function can be satisfactorily exhibited for a long time.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a dimming device lifting device for windows of the present invention is applied to a pleated screen will be described with reference to the drawings.
1 is a perspective view of the pleated screen slightly opened, FIG. 2 is a schematic plan view of the pleated screen, FIG. 3 is an enlarged plan view of III-III and III-III in FIG. 2, and FIG. FIG. 5 is a sectional front view of FIG. 3, FIG. 6 is an enlarged plan view of VI-VI, VI-VI part of FIG. 2, and FIG. 5 is a sectional front view of FIG. 6, FIG. 8 is an enlarged plan view of the VIII-VIII and VIII-VIII portions of FIG. 2, FIG. 9 is a sectional front view of FIG. 8, and FIG. 10B is a cross-sectional side view of the head box, FIG. 11A is a schematic view showing the engagement between the guide groove and the guide pin, and FIG. 11B is the head. FIG. 12 is a perspective view of the periphery of the stopper mechanism.

A pleated screen 1 shown in each drawing includes a head box 2 fixed to an indoor side upper portion of a window frame (not shown), a bellows-folded screen 3 suspended up and down from the head box 2, and a lower end of the screen 3. And an operation cord 5 dedicated to ascent and an operation cord 6 dedicated to descending are suspended from one end of the head box 2.
The screen 3 and the bottom rail 4 can be moved up and down by manual operation for directly raising and lowering them by hand, as well as by an operation cord 5 for raising, an operation cord 6 for lowering, and cord operation. 7 can be used to stop the screen 3 at an arbitrary opening position by any of these four operations.

  Inside the one end portion side of the head box 2, the above-described constant load spring mechanism 7 in which a leaf spring 12 is wound between a pair of spring winding drums 10 and 11 is disposed. On both sides of the drum 10, an ascending cord drum 13 and a descending cord drum 14 are coaxially disposed. A suspension string drum 10a is integrally provided on one side of one spring winding drum 10, and a suspension string 15 for raising and lowering the screen 3 is wound around the suspension string drum 10a. A saw blade 10b is formed on the outer periphery of the flange portion of the drum 10a.

  An ascending operation cord 5 guided by guide rollers 16a and 16b is wound around the inside of the one end portion of the head box 2 around the ascending cord drum 13, and the descending cord drum 14 is similarly provided with the head cord 2 of the head box 2. A lowering operation cord 6 guided by the guide rollers 17a and 17b is wound around the inside of the one end side, and the raising operation cord 5 is the same as the leaf spring 12 from the upper side of the head box 2 on the rising cord drum 13. The lowering operation cord 6 is wound in the direction (counterclockwise in FIG. 5), whereas the lowering operation cord 6 is wound around the lowering cord drum 14 from the bottom plate 2a side of the head box 2 in the opposite direction to the leaf spring 12 (in FIG. Direction).

  The leaf spring 12 has different numbers of windings on the spring winding drums 10 and 11 depending on the opening positions of the screen 3 and the bottom rail 4. For example, the screen 3 and the bottom rail 4 are raised to the uppermost position directly below the head box 2. In the state, most of it is wound around the other spring winding drum 11, and its own spring force acts as a force for rotating one spring winding drum 10 counterclockwise in FIG. Yes.

The hanging string 15 fed out from the hanging string drum 10a toward the intermediate portion of the head box 2 is branched into two on the way, and the two hanging strings 15a and 15b are used to increase the lifting stroke of the screen 3. A plurality of guide rollers 18a → guide rollers 18b → guide rollers 18c → guide rollers 18b are sequentially wound from one end to the other end of the upper surface of the box 2, and then one suspension string 15a is moved from the guide roller 18d to the head. The bottom plate 2a of the box 2 and the screen are connected to the bottom rail 4 and the other hanging strap 15b passes from the guide roller 18b through the guide roller 18c → the guide roller 18e, and then the bottom plate 2a of the head box 2 and the screen. And is connected to the bottom rail 4.
As a result, when either the manual operation or the operation cords 5 and 6 are used, one of the spring winding drum 10 and the hanging string drum 10a rotates integrally to wind or feed the hanging strings 15a and 15b. The screen 3 and the bottom rail 4 are raised or lowered together.

  Between the guide rollers 18a and 18b, there is a tensioner 20 in which three tension pins 20a, 20b and 20c are erected from the bottom plate 2a, and the head box 2 is reciprocated in the longitudinal direction on these tension pins 20a to 20c. The above-described suspension strings 15a and 15b are wound to apply a predetermined tension to the suspension strings 15a and 15b. With such a configuration, the load of the screen 3 and the bottom rail 4 and the suspension strings 15a and 15b The tension is balanced with the spring force of the leaf spring 12 of the constant load spring mechanism 7 so that the screen 3 and the bottom rail 4 can be stopped at an arbitrary opening position.

4 and 5 show a non-operating state in which the manual operation and the cords 5 and 6 are not pulled, and most of the leaf spring 12 of the constant load spring mechanism 7 is attached to the other spring winding drum 11. It is wound up and is in a fully closed state in which the screen 3 and the bottom rail 4 are raised to the uppermost position directly below the head box 2.
In this state, when the bottom rail 4 is manually pulled downward, one spring winding drum 10 of the constant load spring mechanism 7 rotates counterclockwise in FIG. 5, and the other spring winding drum 11 is rotated. 5 rotates clockwise, and the leaf spring 12 is wound up from the other spring winding drum 11 to one spring winding drum 10.

The hanging string drum 10a adjacent to the one spring winding drum 10 is rotated together with the one spring winding drum 10 in the counterclockwise direction in FIG. 15a and 15b are fed out, and the screen 3 and the bottom rail 4 are lowered.
Since the spring force of the leaf spring 12 of the constant load spring mechanism 7 is set to balance the load of the screen 3 and the bottom rail 4 and the tension of the suspension straps 15a and 15b, the screen 3 and the bottom rail 4 At any point in time when the downward pulling by manual operation is canceled, it stops at any open position.

  Further, when the bottom rail 4 in which the screen 3 is in an arbitrary open position is pushed up manually, the hanging straps 15, 15 a, 15 b and the constant load spring mechanism 7 are operated in reverse to the above-described lowering, The screen 3 and the bottom rail 4 are lifted together, and the screen 3 and the bottom rail 4 stop at an arbitrary position no matter at which point the manual push-up is released.

A first cord return drum 13a is provided integrally on the spring winding drum 10 side of the ascending cord drum 13, and a second cord return is provided on the spring winding drum 10 side of the lowering cord drum 14. A drum 14a is integrally provided, a first rewind string 21 is wound around the first cord return drum 13a, and a second rewind string 22 is wound around the second cord return drum 14a. Has been.
One end portions of the first and second rewind strings 21 and 22 are folded in the vicinity of the intermediate portion of the head box 2 and fixed to the head box 2 using screws 24a and 24b in the vicinity of the guide stoppers 23a and 23b. The folded portions of the first and second rewind strings 21 and 22 are wound around tension rollers 25a and 26a provided at one end portions of the return springs 25 and 26, respectively.

  The return springs 25 and 26 are elastic members corresponding to the rewinding means of the present invention, and coil springs are used in this embodiment. The other ends of the return springs 25 and 26 are locked to hooks 27a and 27b projecting from the other end of the head box 2, and in a non-operating state in which the screen 3 is not raised or lowered, a constant load spring It is held in an appropriate stretched state by the spring force acting from the leaf spring 12 of the mechanism 7 through the first and second rewind strings 21 and 22.

With this configuration, the ascending operation cord 5 passes through the ascending cord drum 13 and the first cord returning drum 13a, and the first rewinding string 21 and the one return spring 25 are integrally connected. 5, the ascending cord drum 13 rotates clockwise in FIG. 5 to feed the ascending operation cord 5, and the first cord returning drum 13 a integrated with the ascending cord drum 13 also rotates in the clockwise direction in FIG. 5. Then, the first rewind string 21 is wound up and the return spring 25 is extended.
When the pulling of the ascending operation cord 5 is released, the return spring 25 is contracted and the first rewind string 21 is pulled back toward the initial position, and the ascending cord drum 13 and the first cord returning drum 13a are moved as shown in FIG. The operation cord 5 is rotated counterclockwise as a unit, and the ascending operation cord 5 is wound around the ascending cord drum 13 by the traction amount to return to the initial position before towing.

On the other hand, the lowering operation cord 6 is integrally connected to the second rewind string 22 and the other return spring 26 via the lowering cord drum 14 and the second cord returning drum 14a, and pulls the lowering operation cord 6. Then, the lowering cord drum 14 rotates counterclockwise in FIG. 5 to feed the lowering operation cord 6, and the second cord return drum 14a integrated with the lowering cord drum 14 also rotates counterclockwise in FIG. Then, the second rewind string 22 is wound up and the return spring 25 is extended.
Further, when the pulling of the lowering operation cord 6 is released, the return spring 26 is reduced and the second rewinding string 22 is pulled back toward the initial position, and the lowering cord drum 14 and the second cord returning drum 14a are moved as shown in FIG. The lower operation cord 6 is rotated in the clockwise direction, and the lowering operation cord 6 is wound around the lowering cord drum 14 by the pulling amount to return to the initial position before the pulling.
The guide stoppers 23a and 23b also serve as a restriction for the extension of the return springs 25 and 26. The maximum extension amount of the return springs 25 and 26 is determined by the tension rollers 25a and 26a and the guide stoppers 23a and 23b of the return springs 25 and 26. It is regulated at the stage where it abuts.

  In this way, on the one end portion side of the head box 2, the drum unit 30 in which a plurality of drums are arranged around one spring winding drum 10 of the constant load spring mechanism 7, and the other spring winding drum. 11 and a drum unit 31 in which a plurality of drums are arranged. In this embodiment, common equipment is used for these drum units 30 and 31 for the convenience of sharing parts, but it is mainly on one drum unit 30 side that functions to raise and lower the screen 3 and the bottom rail 4. The components of the other drum unit 31 are not necessarily shared.

  The inside of one drum unit 30 is a hollow hole 32 whose center is partitioned by a partition wall 10 c, and a ratchet mechanism 33 is incorporated in the hollow hole 32. The ratchet mechanism 33 includes ratchets 34a and 34b that are provided as unidirectional teeth on both side surfaces of the partition wall 10c, ratchet holders 35a and 35b that slide the hollow holes 32 in the axial direction on both sides of the partition wall 10c, and the ratchet. Friction rollers 36a and 36b and clutch springs 37a and 37b accommodated on the opposite side of the partition wall 10c of the holders 35a and 35b, and the ratchet holders 34a and 34b of the partition wall 10c Ratchets 38a and 38b, which are opposite one-way teeth, are provided.

  As shown in FIGS. 10 (a) and 11 (a), dog-shaped guide grooves 40a and 40b are symmetrically arranged on the outer peripheral surfaces of the ratchet holders 35a and 35b, while the first and second cords are provided. Guide pins 41a and 41b are projected from the return drums 13a and 14a. The guide pins 41a and 41b are loosely inserted into the guide grooves 40a and 40b, and the first and second cord return drums 13a and 14a are inserted. By rotating either of these, the ratchet holders 35a and 35b can slide the hollow hole 32 in the axial direction.

  FIG. 4 shows a non-actuated state of the ratchet mechanism 33 in which the ascending operation cord 5 and the descending operation cord 6 are not operated, and the guide pins 41a and 41b are located in the circumferential direction portions of the guide grooves 40a and 40b. The holders 35a and 35b are located on the opposite side of the partition wall 10c, and the ratchets 34a and 34b of the partition wall 10c do not mesh with the ratchets 38a and 38b of the ratchet holders 35a and 35b.

The ratchet mechanism 33 is actuated by pulling one of the operation codes 5 and 6. For example, when the screen 3 and the bottom rail 4 are in the lowest fully open position or the intermediate open position, most or most of the leaf spring 12 of the constant load spring mechanism 7 is wound around one spring winding drum 10. ing. When the ascending operation cord 5 is pulled from such a state, the ascending cord drum 13 and the first cord returning drum 13a rotate integrally in the clockwise direction in FIG. 5, and the return spring 25 is extended.
In addition, the guide pin 41a of the first cord return drum 13a moves from the circumferential portion of the guide groove 40a to the inclined portion, and slides the ratchet holder 35a in the direction of the partition wall 10c, thereby ratcheting the ratchet holder 35a and the partition wall 10c. 38a and 34a mesh.

As a result of this engagement, one spring winding drum 10 of the constant load spring mechanism 7 and the hanging string drum 10a adjacent thereto are rotated clockwise in FIG. 5 and are suspended from the hanging string drum 10a. 15, 15a and 15b are pulled in, and the screen 3 and the bottom rail 4 rise.
The maximum pulling amount of the ascending operation cord 5 is the maximum until the guide stopper 23a of the return spring 25 comes into contact with the guide stopper 23a. The one-code return drum 13a rotates in the reverse direction, the guide pin 41a moves to the circumferential portion of the guide groove 40a, the ratchet holder 35a is slid in the direction opposite to the partition wall 10c, and the ratchets 38a, 34a are engaged. Canceled. As a result, the constant load spring mechanism 7 does not reverse but maintains the current state.

  The operation code 5 for lifting that has been released is returned to the initial position before towing by the reduction of the return spring 25, and the screen 3 and the bottom rail 4 can be moved to the desired position by repeating the operation of the operation code 5 for raising. To the closed position.

  When the screen 3 and the bottom rail 4 are in the uppermost fully closed position or the intermediate open position, most or most of the leaf spring 12 of the constant load spring mechanism 7 is wound around the other spring winding drum 11. Has been. When the lowering operation cord 6 is pulled from such a state, the lowering cord drum 14 and the second cord returning drum 14a rotate integrally in the counterclockwise direction of FIG. 5 to extend the return spring 26. . Further, the guide pin 41b of the second cord return drum 14a moves from the circumferential portion of the guide groove 40b to the inclined portion, and slides the ratchet holder 35b in the direction of the partition wall 10c to thereby ratchet the ratchet holder 35b and the partition wall 10c. 38b and 34b mesh.

By this engagement, one spring winding drum 10 of the constant load spring mechanism 7 and the hanging string drum 10b adjacent to the drum 10 rotate together counterclockwise in FIG. 5 and are suspended from the hanging string drum 10a. The strings 15, 15a, 15b are drawn out, and the screen 3 and the bottom rail 4 are lowered.
The pulling amount of the lowering operation cord 6 is restricted by the guide stopper 23a similarly to the raising operation cord 5, and when the lowering operation cord 6 is released, the lowering cord drum 14 and the second cord return drum are released. 14a reversely rotates, the guide pin 41b moves to the circumferential portion of the guide groove 40b, and the ratchet holder 35b is slid in the direction opposite to the partition wall 10c, so that the meshing of the ratchets 38b and 34b is released. As a result, the constant load spring mechanism 7 does not reverse but maintains the current state.

  The operation code 6 for lowering that has been released is lifted and returned to the initial position before towing by the reduction of the return spring 26, and the screen 3 and the bottom rail 4 can be moved to the desired position by repeating the operation of the operation code 6 for lowering. Descends to the open position.

A stopper mechanism 42 is provided in the vicinity of one drum unit 30, and the hanging strap 15 for raising and lowering the screen is stretched between the hanging drum 10a and the guide roller 18a without being loosened. Yes.
The stopper mechanism 42 includes a slider 43 disposed so as to be slidable in the inner longitudinal direction of the head box 2, a fixed guide roller 44 rotatably supported on the head box 2 side, and a shaft 43 rotatably supported by the slider 43. The movable guide roller 45 and the return spring 46 that repels the slider 43 toward the one drum unit 30 are provided. The suspension string 15 is wound around the fixed guide roller 44 and the movable guide roller 45 in an S shape. ing.

  The drum unit 30 side of the slider 43 is formed in a wedge shape, and a saw tooth 43a that meshes with the saw tooth 10b of the hanging drum 10a is formed on the upper surface thereof. A rod 43b projects from the slider 43 on the side opposite to the drum unit 30. The rod 43b is inserted into the projecting piece 2b on the head box 2 side, and a return spring 46 is externally inserted into the rod 43b. 46 is contracted between the slider 43 and the protruding piece 2b.

The elastic force of the return spring 46 is set to be smaller than the tension of the suspension string 15 wound around the fixed guide roller 44 and the movable guide roller 45. As shown in FIG. It is separated from the drum 10a.
When the screen 3 and the bottom rail 4 are in the uppermost fully closed position or the lowermost fully open position, the stopper mechanism 42 configured in this way maintains the separated state between the slider 43 and the hanging string drum 10a. ing.

  When the screen 3 and the bottom rail 4 are at the lowest fully opened position, and the pulling operation cord 6 is further pulled, the hanging drum drum 10a rotates counterclockwise in FIG. However, since the screen 3 and the bottom rail 4 are already at the lower limit and do not descend any further, the hanging strap 15 relaxes between the guide rollers 44 and 45. As a result, the elastic force of the return spring 46 acts on the slider 43, slides the slider 43 toward the hanging string drum 10a, and the saw teeth 10b and 43a mesh to prevent the hanging string drum 10a from rotating. .

  Therefore, even if the screen 3 and the bottom rail 4 are already positioned at the lowest limit, and the pulling operation cord 6 is further pulled from this state, the hanging string 15 is unnecessarily drawn out from the hanging string drum 10a. Since there is nothing, the hanging strap 15 is not entangled in a mischief, and a highly reliable lifting operation can be stably performed for a long time.

It is a perspective view of the state where the pleat screen which shows one example of the present invention was opened a little It is a schematic plan view of the pleated screen which shows one example of this invention. FIG. 3 is an enlarged plan view of III-III and III-III portions of FIG. 2. FIG. 3 is an enlarged cross-sectional plan view of III-III and III-III portions of FIG. 2. FIG. 4 is a sectional front view of FIG. 3. FIG. 4 is an enlarged plan view of VI-VI and VI-VI portions of FIG. 2. FIG. 7 is a sectional front view of FIG. 6. It is an enlarged plan view of the VIII-VIII, VIII-VIII part of FIG. It is a cross-sectional front view of FIG. (A) is the schematic which shows engagement of a guide groove and a guide pin, (b) is a cross-sectional side view of a head box. (A) is the schematic which shows engagement of a guide groove and a guide pin, (b) is a cross-sectional side view of a head box. It is a perspective view around a stopper mechanism.

Explanation of symbols

1. Pleated screen (light control member of the present invention)
DESCRIPTION OF SYMBOLS 2 ... Head box 3 ... Screen 4 ... Bottom rail 5 ... Lifting operation code 6 ... Lowering operation code 7 ... Constant load spring mechanism 10, 11 ... Spring winding drum 10a ... Hanging string drum 12 ... Leaf spring 13 ... Lifting Cord drum 14 ... Descent cord drums 15, 15a, 15b ... Hanging strings 25, 26 ... Return spring (rewinding means of the present invention)
DESCRIPTION OF SYMBOLS 21 ... 1st rewind string 22 ... 2nd rewind string 30, 31 ... Drum unit 33 ... Ratchet mechanism 35a, 35b ... Ratchet holder 34a, 34b, 38a, 38b ... Ratchet 40a, 40b ... Guide groove 41a, 41b ... Guide pin 42 ... Stopper mechanism 43 ... Slider

Claims (4)

A constant load spring mechanism in which a leaf spring is wound between a pair of spring winding drums is disposed on a head box that hangs a light control member for a window such as a roman shade or a pleated screen.
In the dimming member elevating device for windows, the spring force of the leaf spring of the constant load spring mechanism is applied to the dimming member so as to hold the dimming member at an arbitrary open position or closed position.
One of the pair of spring winding drums is a descending cord drum wound with the operation cord for lowering the light control member and a rising cord drum similarly wound with the operation cord for raising the light control member. Arranged coaxially with one side,
Ascending cord drum and descending cord drum are pulled by one of the ascending operation cord and descending operation cord between the one spring winding drum, ascending cord drum and descending cord drum. And a ratchet mechanism that selectively engages one of the spring winding drums and rotates the ascending cord drum or the descending cord drum together with the one spring winding drum. Dimming member lifting device for windows. The dimming member lifting / lowering device for windows according to claim 1, wherein rotation of the ascending cord drum and the descending cord drum accompanying the one spring winding drum is opposite to each other. When the lifting operation code or the lowering operation code is pulled by a predetermined stroke on each of the ascending cord drum and the lowering cord drum and then released, the lifting operation code or the lowering operation code is used as a towing stroke. The window dimming member lifting / lowering device according to claim 1, wherein a rewinding unit that rewinds the same amount to the ascending cord drum or the descending cord drum is connected. The stopper mechanism for preventing the lowering drum from rotating when the lowering operation cord is further pulled after the light control member is positioned at the lowest limit. The light control member raising / lowering device for windows in any one.

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