JP6998695B2 - Cloaking device - Google Patents

Description

The present invention relates to a shielding device such as a horizontal blind or a pleated curtain.

A horizontal blind is an example of a shielding device. As one type of operating device for adjusting the angle of the slats of the horizontal blind and raising and lowering the slats, an operating rod for adjusting the angle of the slats is hung from one end of the headbox, and the operating rod is penetrated from the headbox. Or, there is one in which the lifting cord is hung separately without letting it.

In such a horizontal blind, by rotating the operation rod, the slats are rotated via the angle adjusting device and the ladder cord arranged in the head box. Further, the bottom rail and the slat are pulled up by pulling the elevating cord pulled out from the head box, and the bottom rail and the slat are lowered by pulling the pulled out elevating cord into the head box.

Inside the head box, a bottom rail and a self-weight drop prevention device for preventing the self-weight drop of the slats as a solar shielding material are provided. When the elevating cord is pulled out and then released, this self-weight descent prevention device is in a locked state that prevents the elevating cord from being pulled into the headbox and prevents the bottom rail and slat from descending by their own weight. If it is pulled out to, the locked state is released and the bottom rail and the slats can be lowered by the self-weight descent. It is also possible to pull out the elevating cord from the locked state to pull up the bottom rail and slats.

Patent Document 1 describes a damper including a centrifugal governor that generates a braking force and a shaft (cord catch) connected to a brake portion, and the elevating cord comes into contact with the outer peripheral surface of the shaft to move the elevating cord. Discloses a blind elevating device with a damper, characterized in that the shaft is rotated and the brake portion is activated. By using this damper, it is possible to reliably give resistance to the movement of the elevating cord due to the descent of its own weight.

Japanese Unexamined Patent Publication No. 2005-030083

By the way, in a shielding device such as a horizontal blind, the number of slats supported by the ladder cord increases as the bottom rail descends, so that the number of slats supported on the bottom rail decreases, and as a result, the slats move up and down. The load applied to the cord is reduced. For this reason, there arises a problem that the load applied to the elevating cord and the resistance force antagonize each other and the bottom rail does not descend to the lowest position and stops halfway.

An object of the present invention is to provide a shielding device in which a shielding material is configured to be able to appropriately descend to the lowest position.

According to the present invention, it is a shielding device that moves a shielding material by pulling a cord, and includes a damper that brakes the movement of the cord that is driven by the movement of the shielding material, and the damper has the cord. A shielding device comprising a cord catch to be sandwiched and having at least one of the following configurations (1) and (2) is provided.
(1) A configuration in which the resistance force between the cord catch and the cord is reduced as the shielding material moves.
(2) The code is a code having an number of n, of which a code having a number of 1 or more and n-1 or less is sandwiched between the code catches, and the n is a natural number of 2 or more. Constitution.

According to the present invention, for example, since the resistance force between the cord catch and the cord is reduced as the shielding material is lowered, the shielding material can be appropriately lowered to the lowest position. .. Alternatively, since it has a configuration in which a part of the cords is sandwiched between the cord catches among a plurality of cords, the resistance between the cords and the cords is higher than that when the entire cords are sandwiched between the cords and the cords. Can be reduced and the shielding material can be appropriately lowered to the lowest position.

From yet another aspect, it is a shielding device that moves the shielding material by pulling the cord, and includes a damper that brakes the movement of the cord that is driven by the movement of the shielding material, and the damper is said to have the same. A cord catch for sandwiching a cord is provided, and there are a plurality of the cords, the cord relating to a part thereof is sandwiched between the cord catches, and the remaining cords are not sandwiched between the cord catches. A shielding device is provided.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.

Preferably, the cord has a different diameter depending on its longitudinal position.

Preferably, the cord comprises a portion having a first diameter and a portion having a second diameter smaller than the first diameter in its longitudinal direction.

Preferably, the cord has a different coefficient of friction depending on its longitudinal position.

Preferably, the cord comprises a portion having a first coefficient of friction and a portion having a second coefficient of friction smaller than the first coefficient of friction in its longitudinal direction.

Preferably, the cord comprises a portion consisting of a cord having an number of n and a portion consisting of a cord having a number of 1 or more and n-1 or less in the longitudinal direction thereof, wherein n is a natural number of 2 or more. Therefore, the resistance force between the cord catch and the cord is reduced as the shielding material descends.

Preferably, when the bottom of the shield is above the reference position, the resistance between the cord catch and the cord is the first resistance, otherwise it is with the cord catch. The resistance force with the cord is a second resistance force smaller than the first resistance force.

Preferably, the reference position is located in a range of 1 to 20% of the movable range from the lowest position related to the movable range of the bottom of the shielding material.

Preferably, the cord supports the shielding material at substantially equal intervals, and the cord having the number of 1 or more and n-1 or less is selected in a combination having symmetry in the position supporting the shielding material.

Preferably, the cord having the number of 1 or more and n-1 or less is two cords supporting both ends of the shielding material.

Preferably, the cord having the number of 1 or more and n-1 or less is all the cords other than the two cords supporting both ends of the shielding material.

Preferably, the shielding material supported by the cord is a bottom rail.

Preferably, the damper is a plurality of dampers including the first and second dampers, and the code having the number of 1 or more and n-1 or less is distributed to the plurality of dampers including the first and second dampers. Be pinched.

It is a schematic diagram which looked at the solar radiation shielding device which concerns on 1st to 4th Embodiment from the front. FIG. 3 is a schematic view of the solar radiation shielding device shown in FIG. 1 as viewed from the left side surface of FIG. It is a schematic diagram which looked at the region A surrounded by the alternate long and short dash line of FIG. 1 from the front. It is a schematic diagram which looked at the inside of the head box which concerns on 1st and 2nd Embodiment from the upper surface. It is a schematic diagram which shows the inside of the centrifugal governor shown in FIG. It is a schematic diagram which shows the schematic structure of the cord catch and the elevating cord which concerns on 1st Embodiment. It is a figure which shows the PP cross section of FIG. 6A and the QQ cross section of FIG. , (C) and (d) are side views showing a mode in which these are sandwiched between the cord catches. It is a schematic diagram which shows the schematic structure of the cord catch and the elevating cord which concerns on 2nd Embodiment. It is a schematic diagram which looked at the inside of the head box which concerns on 3rd Embodiment from the upper surface, and is the figure for demonstrating the outline of the elevating cord in particular. 9 (a) is a view showing an RR cross section and FIG. 9 (b) is a view showing an SS cross section, where (a) is an RR cross section in which an elevating cord is sandwiched between cord catches. (B) is an SS cross section showing a mode in which an elevating cord is sandwiched between cord catches. It is a schematic diagram which looked at the inside of the head box which concerns on 4th Embodiment from the upper surface, and is the figure for demonstrating the outline of the elevating cord in particular. It is a figure which shows the TT cross section of FIG. 11, and is the side view which shows the mode that the elevating cord is sandwiched by a cord catch. It is a schematic diagram which shows the centrifugal governor which concerns on 4th Embodiment, particularly knurling. FIG. 5 is a side view showing a mode in which an elevating cord is sandwiched between cord catches according to a fifth embodiment (a modification of the fourth embodiment).

Embodiment to carry out the invention

Hereinafter, an embodiment in which the solar radiation shielding device according to the present invention is embodied in a horizontal blind will be described with reference to the drawings. The arrow W direction shown in the drawing indicates the longitudinal direction of the head box 1 described later. The arrow H direction indicates the height direction of the head box 1. The arrow D direction indicates the lateral direction of the head box 1.

(First Embodiment)
(1) Description of Configuration (1-1) Overall Configuration of Horizontal Blinds As shown in FIGS. 1 and 2, the horizontal blinds according to the first embodiment are connected to the horizontal blinds from the headbox 1 via a plurality of ladder cords 2. A multi-stage slats 3 are suspended and supported, and a bottom rail 4 is suspended and supported at the lower end of the ladder cord 2. The multi-stage slat 3 and bottom rail 4 function as a solar shielding material.

As shown in FIGS. 1 and 3, a plurality of guide pulleys 24 (three in this embodiment) are arranged in the head box 1 in the vicinity of each ladder code 2. As shown in FIG. 4 (not shown in FIG. 1 and FIG. 3 in consideration of visibility), the guide pulley 24 is configured to be rotatable by a shaft 26 in the guide pulley case 25, and the shaft 26 is configured. It is pivotally supported by the guide pulley case 25. The ladder cord 2 is inserted into the head box 1 through an insertion hole 27 provided at the bottom of the head box 1. The upper end portion thereof is attached to the drum 6, and the angle adjusting shaft 7 is fitted in the central portion of the drum 6.

Therefore, when the angle adjusting shaft 7 is rotated, the drum 6 is rotated, and one of the ladder cords 2 is pulled up with the rotation of the drum 6, so that the angles of the slats 3 are adjusted in the same phase.

An operation rod 8 is suspended and supported at one end of the head box 1. When the operation unit 13 on the operation rod 8 is rotated, the angle adjusting shaft 7 is rotated via a gear box (not shown) arranged in the head box 1. Therefore, the angle of each slats 3 can be adjusted by rotating the operation unit 13.

A plurality of (three in this embodiment) elevating cords 10 (an example of a "cord" in the claims) are inserted into the slats 3, and one end of the elevating cords 10 is attached to the bottom rail 4. That is, each guide pulley 24 is arranged corresponding to each elevating cord 10.

As shown in FIGS. 3 and 4, the other end of the three elevating cords 10 is a cord composed of the knurl 20 in the damper 5 and the pinching pulley 23 via the guide pulleys 24 arranged in the arrow W direction. Through the catch 30, the guide is guided to a self-weight drop prevention device 11 (shown in FIG. 1, not shown in FIGS. 3 and 4 in consideration of visibility) arranged at one end of the head box 1.

Each elevating cord 10 is inserted into the operating rod 8 from its own weight descent prevention device 11 via a gear box (not shown), and its tip is connected to a cord equalizer 13a provided below the operating portion 13. Therefore, when the cord equalizer 13a is pulled downward and the elevating cord 10 is pulled out from the head box 1, the bottom rail 4 is pulled up and the slats 3 are pulled up.

Then, if the pull-out operation of the elevating cord 10 is stopped and the elevating cord 10 is released, the self-weight descent prevention device 11 is activated to prevent the self-weight descent of the slat 3 and the bottom rail 4. Further, when the elevating cord 10 is slightly pulled downward from the state where the self-weight descent prevention device 11 is operating, the operation of the self-weight descent prevention device 11 is released, and the slats 3 and the bottom rail 4 can be lowered by their own weight. Will be. As the self-weight descent prevention device 11, for example, a known self-weight descent prevention device 11 disclosed in Japanese Patent Application Laid-Open No. 2001-173343 may be used. That is, the slats 3 and the bottom rail 4 (an example of the "bottom of the shielding material" in the claims) which are the shielding materials can be raised and lowered by pulling the elevating cord 10.

(1-2) Damper Next, the damper 5 will be described with reference to FIGS. 3 to 5. The damper 5 according to the present embodiment is configured to brake the movement of the elevating cord 10 which is driven by the self-weight lowering of the slats 3 and the bottom rail 4 which are shielding materials. Further, the damper 5 has a knurl 20, a shaft 21, a centrifugal governor 22, and a compression pulley 23, which are provided in the damper case 5a.

<Knurling>
The knurl 20 is fixed to the shaft 21. Further, the knurling 20 is subjected to knurling on the outer peripheral surface. As a result, the contact resistance between the elevating cord 10 and the knurl 20 increases, the displacement of the elevating cord 10 and the knurl 20 are surely synchronized, and the moving speed of the elevating cord 10 is decelerated (that is, the descent speed of the bottom rail 4 is decelerated). ) Can be transmitted more reliably.

<Centrifugovernor>
The centrifugal governor 22 includes a governor case 22d, and the knurl 20 and the pinching pulley 23 are rotatably supported by the governor case 22d. In the present embodiment, the centrifugal governor 22 is provided on both sides of the knurl 20 and the pinching pulley 23, but may be provided on only one side. As shown in FIG. 5, the centrifugal governor 22 has a one-way clutch 22a, a planetary gear mechanism 22b, a shaft 22e, and a blade 22c in the governor case 22d.

The rotation of the shaft 21 is input to the one-way clutch 22a. The one-way clutch 22a is in a non-transmission state in which the rotation of the shaft 21 of the lorlet 20 cannot be transmitted to the shaft 22e via the planetary gear mechanism 22b when the elevating cord 10 is displaced in the ascending direction of the bottom rail 4. When the elevating cord 10 is displaced in the descending direction of 4, the rotation of the shaft 21 of the lorlet 20 is set to a transmission state in which the rotation of the shaft 21 can be transmitted to the shaft 22e via the planetary gear mechanism 22b. The blade 22c is configured to suppress rotation of the knurl 20 when rotational power is applied to the knurl 20 in the transmission state of the one-way clutch 22a.

That is, when the elevating cord 10 is displaced due to the weight of the slat 3 when the slat 3 is lowered, the rotation of the shaft 21 of the knurl 20 is transmitted to the shaft 22e in the centrifugal governor 22, and the centrifugal governor 22 is the elevating cord 10. Resistance is given to the displacement, and the displacement of the elevating cord 10 is suppressed. Therefore, it is possible to reduce the displacement speed that is accelerated by the weight of the slat 3 when the slat 3 is lowered.

More specifically, when the knurl 20 rotates due to the displacement of the elevating cord 10 of the bottom rail 4, the planetary gear mechanism 22b in the centrifugal governor 22 accelerates this and transmits it to the shaft 22e, which accompanies the rotation of the shaft 22e. The blade 22c rotates. Centrifugal force acts by the rotation of the blade 22c, and the blade 22c comes into contact with the inner wall of the governor case 22d of the centrifugal governor 22 to generate a frictional force. As a result, the rotation of the knurl 20 is suppressed. Therefore, where the displacement speed increases at an accelerating rate as the slat 3 descends, the displacement of the elevating cord 10 is suppressed, so that the displacement speed of the bottom rail 4 during the descending operation of the slat 3 can be reduced. ..

On the other hand, if the operator displaces the elevating cord 10 during the ascending operation of the slat 3, the rotation of the shaft 21 of the knurl 20 is not transmitted to the shaft 22e by the one-way clutch 22a. The operator's operation on the code 10 means that the centrifugal governor 22 does not function and operates as it is. Therefore, it is possible to operate the slats 3 without imposing a load on the operator during the raising operation.

<Pressure pulley>
The pinching pulley 23 is configured to reliably contact the elevating cord 10 by pressing the elevating cord 10 together with the knurl 20. As a result, the movements of the elevating cord 10 and the knurl 20 can be synchronized. In other words, the knurl 20 and the pinching pulley 23 function as the cord catch 30. This makes it possible to more reliably transmit the deceleration due to the centrifugal governor 22.

(1-3) Lifting Code Next, the lifting cord 10 sandwiched between the knurl 20 and the pinching pulley 23 (that is, the cord catch 30) will be described.

The load _Fg applied to the elevating cord 10 corresponding to the own weights of the slats 3 and the bottom rail 4 changes depending on the displacement (height) of the bottom rail 4. That is, as the slats 3 are lowered, the slats 3 are supported by the ladder cord 2 and the load applied to the elevating cord 10 becomes smaller.

As shown in FIGS. 6 and 7, the elevating cord 10 according to the present embodiment is configured so that its diameter is different from the middle of the arrow W direction. In consideration of visibility, members other than the elevating cord 10 and the cord catch 30 are not shown in FIGS. 6 and 7. That is, the elevating cord 10 is a portion sandwiched by the cord catch 30 when the bottom rail 4 is at a relatively high position within its own movable range, and its cross section is Φ ₁ (claims). The normal portion 10a having an example of the "first diameter" in the above, and the portion sandwiched by the cord catch 30 when the bottom rail 4 is at a relatively low position within its own movable range, and its cross section is Φ. It has a small resistance portion 10b having a diameter of Φ2 smaller than ₁ (an example of the “ _second diameter” in the claims).

When the normal portion 10a passes through the cord catch 30 when the slat 3 and the bottom rail 4 are lowered, the elevating cord 10 is displaced while the normal portion 10a is sandwiched between the cord catch 30. That is, the knurl 20 in the cord catch 30 rotates with the displacement of the elevating cord 10. Then, since the rotation is input to the centrifugal governor 22 as described above, the resistance force F1 acts so as to reduce the moving speed of the elevating cord ₁₀ .

On the other hand, when the small resistance portion 10b passes through the cord catch 30 when the slats 3 and the bottom rail 4 are lowered, the diameter Φ ₂ of the small resistance portion 10b is small, so that the normal force applied from the cord catch 30 to the small resistance portion 10b. Is small, and the frictional force acting between the small resistance portion 10b and the cord catch 30 is also small. Therefore, the torque for rotating the knurl 20 becomes insufficient. That is, even if the elevating cord 10 is displaced, the frequency of occurrence of the phenomenon that the knurl 20 in the cord catch 30 does not rotate and the elevating cord 10 slips increases. As a result, the resistance force F2 (an example of the " _second resistance force" in the claims) that acts to reduce the moving speed of the elevating cord 10 without properly inputting the rotation of the lorlet 20 to the centrifugal governor 22). Is smaller than the resistance force F ₁ (an example of the "first resistance force" in the claims) that normally acts when the portion 10a passes through the cord catch 30.

That is, if the size of Φ2 and the length of the small resistance portion 10b in the longitudinal direction are appropriately selected, the bottom rail ₄ is located at a relatively low position within its own movable range and becomes the weight of the slats 3 and the bottom rail 4. Even when the load applied to the corresponding elevating cord 10 is small, the bottom rail 4 can be lowered to the lowest position. In particular, it is preferable to select the size of Φ ₂ and the length of the small resistance portion 10b in the longitudinal direction so that the resistance force F ₂ applied to the elevating cord 10 is always smaller than the load F _g . As a result, the bottom rail 4 can be appropriately lowered to the lowest position when the lowering operation is restarted even if the lowering operation is temporarily stopped in the middle.

In carrying out the present embodiment, the ratio of the normal portion 10a and the small resistance portion 10b in each elevating cord 10 is appropriately selected so that the descending speed of the elevating cord 10 does not become too large while considering the above. Is preferable. In particular, a reference position corresponding to the boundary between the normal portion 10a and the small resistance portion 10b is provided in the movable range of the bottom rail 4, and this is set from the lowest position related to the movable range of the bottom rail 4, for example, 1 to 20 in the movable range. It is preferably located in the% range. Furthermore, any two numerical values of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 It is preferably located in the range between.

Further, although three elevating cords 10 are used in the present embodiment, the normal portion of each elevating cord 10 is applied so that the same resistance force is applied to each of the elevating cords 10 for each height of the bottom rail 4. It is preferable to appropriately select the ratio of 10a and the small resistance portion 10b. In particular, when all the elevating cords 10 are sandwiched between the cord catches 30, it is preferable to unify the lengths of the small resistance portions 10b in each elevating cord 10. This is to avoid the inclination of the bottom rail 4 due to the unbalanced resistance applied to the bottom rail 4.

Regarding the diameter Φ2 of the small resistance portion 10b, for example, the elevating cord ₁₀ having a diameter of Φ2 is jointly processed into the elevating cord ₁₀ having _a diameter of Φ1, only the core of the elevating cord 10 is taken out, and the elevating cord 10 is used. This can be achieved by heat shrinking, stretching the elevating cord 10 and the like.

(2) Description of Operation Next, the operation of the horizontal blind equipped with the damper 5 will be outlined.

(2-1) The ascending cord equalizer 13a is pulled downward by the operator, and the ascending cord 10 is pulled out from the head box 1. The elevating cord 10 is attached to the bottom rail 4 by inserting the self-weight drop prevention device 11 in the head box 1, the damper 5, and the slats 3. Therefore, a force in the vertically upward direction is applied to the bottom rail 4 by such a drawer, the bottom rail 4 is pulled up, and the slat 3 is also pulled up at the same time. At this time, the one-way clutch 22a in the damper 5 is in a non-transmission state in which the rotation of the shaft 21 of the knurl 20 cannot be transmitted to the shaft 22e. That is, the braking force of the centrifugal governor 22 is not applied, and the burden on the operator is small.

(2-2) Lifting stop When the pull-out operation of the lifting cord 10 is stopped by the operator and released, the self-weight drop prevention device 11 in the head box 1 is activated to prevent the self-weight drop of the slats 3 and the bottom rail 4. Rail.

(2-3) When the elevating cord 10 is slightly pulled by the operator from the state where the descending self-weight descent prevention device 11 is activated and the bottom rail 4 is stopped at a desired position, the self-weight descent prevention device during operation is in operation. 11 is released, and the bottom rail 4 descends by its own weight. At this time, the one-way clutch 22a in the damper 5 is in a transmission state in which the rotation of the shaft 21 of the knurl 20 can be transmitted to the shaft 22e. That is, since the elevating cord 10 is subjected to the resistance force due to the centrifugal governor 22, the slats 3 slowly descend together with the bottom rail 4. In other words, the acceleration of the descending speed can be prevented.

(2-4) Stop descent When the elevating cord 10 near the cord equalizer 13a that rises with the descent of the slat 3 and the bottom rail 4 is stopped by the operator's hand grasping or the like, the descent of the bottom rail 4 stops. .. Then, when the elevating cord 10 is released, the self-weight drop prevention device 11 in the head box 1 is activated again. Then, the weight drop of the slats 3 and the bottom rail 4 is prevented.

(2-5) End of descent The elevating cord 10 has a normal portion 10a and a small resistance portion 10b, so that the resistance force F ₂ applied to the elevating cord 10 when the small resistance portion 10b passes through the cord catch 30 is determined. The resistance force F1 applied to the elevating cord ₁₀ when the normal portion 10a passes through the cord catch 30 is smaller than that of the normal portion 10a. With this configuration, the bottom rail 4 reaches the lowest position and stops.

(2-6) When the operation unit 13 of the tilt operation rod 8 is rotated by an operator, the angle adjusting shaft 7 rotates via a gear box (not shown) arranged in the head box 1. Then, the drum 6 rotates with the rotation of the angle adjusting shaft 7, and one of the ladder cords 2 is pulled up with the rotation of the drum 6, so that the angle of each slats 3 is adjusted in the same phase according to the rotation. ..

(3) Action and effect According to the above-described embodiment, the following action and effect can be achieved.

The elevating cord 10 has a normal portion 10a and a small resistance portion 10b. Therefore, the resistance force F ₂ applied to the elevating cord 10 when the small resistance portion 10b passes through the cord catch 30 is higher than the resistance force F ₁ applied to the elevating cord 10 when the normal portion 10a passes through the cord catch 30. Is small. With such a configuration, the bottom rail 4 can be lowered to the lowest position while reducing the lowering speed of the slats 3 and the bottom rail 4.

(Second Embodiment)
In the second embodiment, as shown in FIG. 8, the elevating cord 10 is a portion sandwiched by the cord catch 30 when the bottom rail 4 is in a relatively high position within its own movable range and is coated. The unprocessed normal portion 10a and the portion sandwiched by the cord catch 30 when the bottom rail 4 is at a relatively low position within its own movable range and are coated (for example, coating with fluorine, etc.). ) Is provided with a small resistance portion 10b.

The coefficient of friction of the coated small resistance portion 10b (an example of the "second friction coefficient" in the scope of the patent claim) is the coefficient of friction of the uncoated normal portion 10a (the scope of the patent claim). It is smaller than an example of the "first coefficient of friction" in.

In other words, when the small resistance portion 10b passes through the cord catch 30, the frictional force acting between the small resistance portion 10b and the cord catch 30 becomes small. Therefore, the torque for rotating the knurl 20 becomes insufficient, and even if the elevating cord 10 is displaced, the phenomenon that the knurl 20 in the cord catch 30 does not rotate and the elevating cord 10 slips increases. .. As a result, the resistance force F ₂ that acts to slow down the moving speed of the elevating cord 10 without properly inputting the rotation of the knurl 20 to the centrifugal governor 22 acts when the normal portion 10a passes through the cord catch 30. It is smaller _than the resistance force F1.

That is, if the material to be appropriately coated and the length of the small resistance portion 10b in the longitudinal direction are selected, the bottom rail 4 is at a relatively low position within its own movable range and corresponds to the own weight of the slats 3 and the bottom rail 4. Even when the load applied to the elevating cord 10 is small, the bottom rail 4 can be lowered to the lowest position.

(Third Embodiment)
The first and second embodiments disclose, for example, the case where the slats 3 have three insertion points and have three elevating cords 10 corresponding to the respective insertion points. Then, as shown in FIGS. 9 and 10, these three elevating cords 10 are integrated in the middle of the longitudinal direction, and the other end on the cord equalizer 13a side is configured to be one elevating cord 10. .. In consideration of visibility, members other than the elevating cord 10 and the cord catch 30 are not shown in FIGS. 9 and 10.

That is, as shown in FIG. 9A, when the bottom rail 4 is at a relatively high position within its own movable range, the three elevating cords 10a are sandwiched by the cord catch 30. , As shown in FIG. 9B, when the bottom rail 4 is in a relatively low position within its own range of motion, one integrated elevating cord 10b is sandwiched by the cord catch 30. Become.

Assuming that such an elevating cord 10 is referred to as a set of elevating cords 10, it is between the cord catch 30 and a portion of the elevating cord 10 consisting of one (referred to as a small resistance portion 10b for convenience). The frictional force in the above is smaller than the frictional force between the cord catch 30 and a portion of a set of elevating cords 10 consisting of three cords (referred to as a normal portion 10a for convenience). This is because the contact area is smaller in the case of one than in the case of three.

Therefore, when the small resistance portion 10b passes through the cord catch 30, the torque for rotating the knurl 20 becomes insufficient, and even if the elevating cord 10 is displaced, the knurl 20 in the cord catch 30 does not rotate. The frequency of occurrence of the phenomenon that the knurling cord 10 slips increases. As a result, the resistance force F ₂ that acts to slow down the moving speed of the elevating cord 10 without properly inputting the rotation of the knurl 20 to the centrifugal governor 22 acts when the normal portion 10a passes through the cord catch 30. It is smaller _than the resistance force F1.

That is, if the boundary position between the normal portion 10a and the small resistance portion 10b is appropriately selected, the bottom rail 4 is at a relatively low position within its own movable range and moves up and down corresponding to the weight of the slats 3 and the bottom rail 4. Even when the load applied to the cord 10 is small, the bottom rail 4 can be lowered to the lowest position.

(Fourth Embodiment)
In the fourth embodiment, as shown in FIGS. 11 and 12, a part of the three elevating cords 10 is configured so as not to be sandwiched by the cord catch 30. In consideration of visibility, members other than the elevating cord 10 and the cord catch 30 are not shown in FIG. Here, regarding the cord catch 30, it is assumed that two elevating cords 10 out of the three elevating cords 10 are sandwiched between the cord catches 30 and one of them is not sandwiched. In particular, among the three elevating cords 10, the elevating cord 10c that hangs down at the center is not sandwiched between the cord catches 30, but the elevating cords 10a that hang down at both ends are sandwiched so that the slats 3 and the bottom rail 4 can be made. The balance can be maintained without tilting with respect to the horizontal direction. Specifically, as shown in FIGS. 11 to 13, the knurl 20 according to the fourth embodiment dismantling is in the longitudinal direction as compared with the knurl 20 according to the first to third embodiments (see FIG. 5). It is characterized by a short length. Similarly, the pinching pulley 23 also has a shorter length in the longitudinal direction than the pinching pulley 23 according to the first to third embodiments according to the knurl 20. That is, the non-pinched state is realized by passing the elevating cord 10c that is not pinched by the cord catch 30 through the position of the end that does not come into contact with the knurl 20.

With such a configuration, the frictional force between the elevating cord 10 and the cord catch 30 is reduced. This is because the contact area is smaller in the case of two than in the case of three. That is, the torque for rotating the knurl 20 becomes insufficient, and even if the elevating cord 10 is displaced, the frequency of occurrence of the phenomenon that the knurl 20 in the cord catch 30 does not rotate and the elevating cord 10 slips increases. As a result, the resistance force of the centrifugal governor 22 can be reduced and the bottom rail 4 can be lowered to the lowest position. In addition, various elevating cords 10 disclosed in the first to third embodiments may be appropriately combined and adopted so that the descending speed of the elevating cord 10 does not become too high.

Further, in the present embodiment having three elevating cords, it is preferable that the elevating cords 10 supporting both ends of the bottom rail 4 are sandwiched between the cord catches 30 and the elevating cords 10 related to the center are not sandwiched. This is to avoid the inclination of the bottom rail 4 due to the unbalanced resistance applied to the bottom rail 4. Of course, the configuration is not limited to this as long as it is configured to prevent an unbalanced resistance force from being applied. In particular, among the plurality of elevating cords 10, it is preferable that some of the elevating cords 10 are sandwiched in such a combination that the elevating cords 10 support the bottom rail 4 with symmetry. Therefore, a configuration in which the elevating cord 10 supporting both ends shown in FIG. 11 is sandwiched and the elevating cord 10 related to the center is not sandwiched is also included in such a preferred embodiment.

Further, Table 1 shows the combinations of the elevating cords 10 satisfying the above-mentioned symmetry when the number of the elevating cords 10 is increased to five. For the notation in Table 1, each elevating code 10 will be referred to as "elevating code 10-i". i is an identifier of the elevating cord 10, and i = 1, 2, 3 ... From one end to the other based on the position supporting the bottom rail 4. In the table, "○" indicates a pinched state, and "x" indicates a non-pinched state. Referring to Table 1, the pattern 4 is a pattern 4 in which two elevating cords 10 (elevating cords 10-1, 10-5) supporting both ends of the bottom rail 4 are sandwiched between the cord catches 30 among the five elevating cords 10. It means that the other three elevating cords 10 (elevating cords 10-2, 10-3, 10-4) are sandwiched without being worn. In this embodiment, the horizontal blind is taken as an example of the shielding device, but it should be noted that the embodiment can be applied to a Roman shade or the like, which tends to have a large number of elevating cords 10. The same applies when the number of the lifting cords 10 is 6 or more (particularly preferably 7, 9, 11, 13, etc.).

(Fifth Embodiment)
In the present embodiment, a damper 5 for reducing the moving speed of each elevating cord 10 is separately provided. Even in such a case, the elevating cord 10 disclosed in the first to fourth embodiments can be appropriately adopted to lower the bottom rail 4 to the lowest position.

Here, it will be described as a modification of the fourth embodiment described above. In FIG. 14, dampers 5 are provided on both sides inside the head box 1, the one on the left side is the damper 5l, and the one on the right side is the damper 5r (of the "first and second dampers" in the claims). One case). Here, the elevating cords 10-1, 10-2, 10-3 extend toward the damper 5l, and the elevating cords 10-4, 10-5 extend toward the damper 5r. However, as shown in the figure, the elevating cords 10-2 and 10-4 are not sandwiched between the cord catches 30. That is, FIG. 14 shows the state of pattern 2 in Table 1. Of course, the number of dampers 5 is not limited to two, nor is it limited to horizontal blinds. It should be noted that the embodiment can also be applied to Roman shades and the like. Further, it can also be applied to a shielding device (pleated screen or the like) composed of two shielding materials. In such a case, since the two bottom rails are provided, the elevating cords supporting the respective bottom rails are appropriately distributed to a plurality of dampers and sandwiched, and some of the elevating cords are not sandwiched.

Further, not limited to the first to fourth embodiments, the braking force applied to the plurality of dampers 5 for the plurality of elevating cords 10 is configured to be different from each other, and a desired braking force is realized as a whole. You can also.

(Modification example)
The above-mentioned first to fifth embodiments can be carried out in the following embodiments in which they are appropriately modified.

In the first to third embodiments described above, the elevating cord 10 has a normal portion 10a and a small resistance portion 10b, but is not limited to this, and is between the cord catch 30 so that a plurality of resistance forces of 3 or more are applied. There may be three or more portions configured so that their resistances differ from each other. Alternatively, the resistance force may be continuously changed according to the position of the elevating cord 10 in the longitudinal direction.

In the above-mentioned first to fifth embodiments, the number of the elevating cords 10 is a plurality of three, but may be one, two, or four or more. In particular, in the third embodiment, one set of elevating cords 10 has three at one end and one at the other end, but in the longitudinal direction, a portion consisting of n elevating cords and one or more elevating cords are used. It may be an elevating cord 10 composed of a portion consisting of an elevating cord of n-1 or less (a natural number of n ≧ 2). In other words, the number of elevating cords 10 related to one end may be larger than the number of elevating cords 10 related to the other end.

In the first to fifth embodiments described above, the code catch 30 is disclosed as a part of the damper 5, but the present invention is not limited to this, and the code catch 30 may be provided separately from the damper 5.

In the above first to fifth embodiments, the knurling is performed on the knurling 20, but if the frictional force between the elevating cord 10 and the knurling 20 can be sufficiently obtained, the knurling may not be performed.

In the first to fifth embodiments described above, the one-way clutch 22a is used, but the one-way clutch 22a may not be provided if resistance may be applied during the raising operation of the slat 3.

In the first to fifth embodiments described above, the centrifugal governor 22 is adopted as the deceleration mechanism, but the knurl 20 may be configured to incorporate an oil damper instead of the centrifugal governor 22.

In the above 1st to 5th embodiments, the present invention is applied to the horizontal blind that raises and lowers the slats 3, but the present invention is not limited to this, and the present invention is applied to a shielding device such as a pleated curtain that raises and lowers a shielding material such as a curtain cloth. May be applied.

1 ... Headbox, 2 ... Ladder Code, 3 ... Slat, 4 ... Bottom Rail, 5 ... Damper, 5a ... Damper Case, 5l ... Damper, 5r ... Damper, 6 ... Drum, 7 ... Angle adjustment shaft, 8 ... Operation rod, 10 ... Elevating cord, 10a ... Elevating cord (normal part), 10b ... Elevating cord (small resistance) Part), 10c ... Elevating cord (non-sandwiched), 10-i: Elevating cord (with identifier), 11 ... Self-weight descent prevention device, 13 ... Operation unit, 13a ... Code equalizer, 20 ... lauret, 21 ... axis, 22 ... centrifugal governor, 22a ... one-way clutch, 22b ... planetary gear mechanism, 22c ... blade, 22d ... governor case, 22e ... Shaft, 23 ... Damper, 24 ... Guide, 25 ... Guide, Case, 26 ... Shaft, 27 ... Insertion hole, 30 ... Code catch.

Claims (8)

It is a shielding device that moves a shielding material by pulling a cord, and includes a damper that brakes the movement of the cord that follows the movement of the shielding material, and the damper catches a cord that sandwiches the cord. A shielding device comprising a configuration in which a resistance force between the cord catch and the cord is reduced as the weight of the shielding material drops . The shielding device according to claim 1 , wherein the cord has a different diameter depending on its position in the longitudinal direction. The shielding device according to claim 2 , wherein the cord includes a portion having a first diameter and a portion having a second diameter smaller than the first diameter in the longitudinal direction thereof. The shielding device according to any one of claims 1 to 3 , wherein the cord has a friction coefficient that differs depending on its position in the longitudinal direction. The shielding device according to claim 4 , wherein the cord includes a portion having a first friction coefficient and a portion having a second friction coefficient smaller than the first friction coefficient in the longitudinal direction thereof. The code includes a portion consisting of a code having an number of n in the longitudinal direction and a portion consisting of a code having a number of 1 or more and n-1 or less, and the n is a code having a natural number of 2 or more. The shielding device according to any one of claims 1 to 5 , wherein the resistance force between the cord catch and the cord is reduced as the shielding material descends. .. When the bottom of the shielding material is above the reference position, the resistance force between the cord catch and the cord is the first resistance force, and in other cases, the cord catch and the cord The shielding device according to any one of claims 1 to 6 , wherein the resistance force between the two is a second resistance force smaller than the first resistance force. The shielding device according to claim 7 , wherein the reference position is located in a range of 1 to 20% of the movable range from the lowest position related to the movable range of the bottom of the shielding material.

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