JP2017008613A - Shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielding device capable of reducing a lowering speed of a shield material while suppressing the occurrence of displacements among a plurality of lifting cords.SOLUTION: A shielding device according to the present invention lifts/lowers shield material by pulling a tensile cord or an object connected to the tensile cord. In the tensile cord, a separate resistance cord is connected to a plurality of lifting cords provided on the side of the shield material. The shielding device makes input rotation applied to a rotary resistor by the resistance cord driven in association with self-weight descent of the shield material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shielding device.

  In the horizontal blind, the end on the support side of the tension cord is attached to the bottom rail, and the bottom rail is raised and lowered by changing the lead length of the tension cord from the head box by the operation on the tension cord operation side There are things.

  In such horizontal blinds, normally, the head box is provided with a stopper portion for holding the tension cord so that the bottom rail does not descend by its own weight, and is locked at the stopper portion by the operation on the operation side of the tension cord. Release the state and lower the bottom rail by its own weight.

  In such a horizontal blind, if the hand is released from the tension cord in a state where the stopper portion is unlocked, the bottom rail may fall down to the lower limit position and generate noise.

  In order to solve such a problem, in Patent Document 1, three lifting cords are respectively wound around the drums arranged in the head box, and the drums are rotated as the bottom rail descends to generate rotational resistance. By doing so, the descent speed of the bottom rail is reduced.

Japanese Utility Model Publication No. 56-70094

  However, in the configuration of Patent Document 1, three lifting cords are wound around the drums, respectively. Therefore, when resistance is not uniformly applied to the three lifting cords or slip occurs between the lifting cords and the drum. There is a problem that the relative position between the three lifting / lowering cords shifts (position shift occurs).

  This invention is made | formed in view of such a situation, and provides the shielding apparatus which can reduce the descent | fall speed of a shielding material, suppressing generation | occurrence | production of position shift between several raising / lowering cords. Is.

  According to the present invention, there is provided a shielding device that lifts and lowers a shielding material by pulling a tension cord or an object connected thereto, wherein the tension cord is separated from a plurality of lifting cords provided on the shielding material side. There is provided a shielding device in which an input rotation is applied to a rotating resistor by the resistance cord that is configured to be connected to the shield material as the weight of the shielding material is lowered.

  The shielding device of the present invention is configured such that an input rotation is applied to the rotating resistor by a resistance cord connected to a plurality of lifting cords, and a rotational resistance is given to the resistance cord by its reaction. Yes. In the present invention, since the rotational resistance is collectively applied to the resistance cord, the resistance is equally applied to the plurality of lifting cords connected to the resistance cord. In addition, since the plurality of lifting / lowering cords are connected to each other at the connection portion with the resistance cord, there is no positional displacement between the plurality of lifting / lowering cords. Therefore, according to the present invention, it is possible to reduce the descending speed of the shielding material while suppressing the occurrence of misalignment between the plurality of lifting cords.

  In the present invention, the “resistance cord” means an arbitrary cord capable of applying input rotation to the rotating resistor, and the material and cross-sectional shape thereof are not particularly limited, and are chain-like, columnar, Includes belts and tapes.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, in the shielding device, a support side and an operation side of the tension cord are led out from the head box, and the lead length on the support side of the tension cord is changed by pulling the tension cord or the object to shield the tension cord. It is a shielding device that raises and lowers a material.
Preferably, the resistance cord is one of a ball chain and a cord having a diameter larger than that of the tension cord.
Preferably, a stopper portion configured to be switchable between a locked state that prevents the tension cord from being driven and a released state that permits the movement of the tension cord is provided, and the stopper portion is configured to lower the weight of the shielding material. A release state maintaining function for maintaining the release state.
Preferably, the stopper portion can be brought into a released state by pulling the tensile cord when the stopper portion is in a locked state, and the tensile cord is moved when the stopper portion is in the released state. The locked state can be achieved by pulling.
Preferably, the elevating cord and the resistance cord are connected by a connection method selected from welding, bonding, sewing, caulking, knotting, and engagement between knots and holes.
Preferably, a pulley that engages with the resistance cord, and a pressing body that is disposed adjacent to the pulley and has an inner wall shaped along the outer peripheral surface of the pulley, the resistance cord is disposed between the pulley and the pressing plate. The pulley is rotated along with the movement of the resistance cord by being inserted into the rotation cord, and the input rotation is applied to the rotation resistor along with the rotation.
Preferably, it includes a stopper portion configured to be able to switch between a locked state that prevents the tension cord from being driven and a released state that allows movement of the tension cord, and the rotating resistor is more than the stopper portion, Provided on the operating side of the tension cord.

It is a front view which shows the horizontal blind of 1st Embodiment of this invention. It is an enlarged view of the upper right part of the horizontal blind of FIG. It is the schematic diagram which extracted and tensioned the tension | pulling cord 19 and its related member from FIG. 1, (a) shows the state in which the bottom rail 4 exists in a lower limit position, (b) pulls down the operation side 19o of the tension | pulling cord 19 The bottom rail 4 is in a raised position. 4 is a cross-sectional view showing a configuration of a stopper portion 16. FIG. FIG. 3 is an exploded perspective view showing a main part of a stopper part 16. It is a bottom view of the carriage 33 showing the guide groove 49 of the stopper portion 16. FIG. 6 is a cross-sectional view showing the operation of the stopper portion 16. FIG. 6 is a cross-sectional view showing the operation of the stopper portion 16. 1A shows the operation rod 8, the support case 11, and the code equalizer 10 in FIG. 1, and the operation rod 8 and the support case 11 show a cross section passing through the contact surfaces of the support base 11a and the cover 11b. . (B) shows a state in which the code equalizer 10 is pulled down from the state of (a). (A) is sectional drawing which passes along the center of the base cord 12a of the part of the support case 11 of Fig.9 (a). (B)-(c) is AA sectional drawing in (a), (b) shows the state by which the base cord 12a is arrange | positioned in the cord insertion groove 14b, (c) is a raising / lowering cord. 9 shows a state where it is arranged in the cord insertion groove 14b. (A) is a perspective view which shows the support base 11a and its internal components, (b) is an exploded perspective view of (a). It is the disassembled perspective view which looked at the state of FIG.11 (b) from another angle. 3 is a perspective view showing a configuration in which a rotation resistor 15 is supported by a window frame 25 fixedly installed on a wall surface adjacent to a horizontal blind 30. FIG. (A)-(b) is drawing corresponding to Drawing 9 (a) in the state where bottom rail 4 was lowered to the lower limit position vicinity in the horizontal blind of a 2nd embodiment of the present invention. (A) And (b) shows the state before the area | region R which does not arrange | position a ball | bowl passes the rotation transmission pulley 14, and the state after passing, respectively. (A)-(b) respond | corresponds to Fig.14 (a)-(b), (a) shows the state which the bottom rail 4 fell to the lower limit vicinity, (b) is (a). In this state, the bottom rail 4 is lowered by a distance corresponding to the region R and reaches the lower limit. It is drawing corresponding to Fig.9 (a) in the state in which the bottom rail 4 fell to near lower limit position in the horizontal blind of 3rd Embodiment of this invention. (A) is drawing corresponding to Fig.9 (a) in the state in which the bottom rail 4 fell to near lower limit position in the horizontal blind of 4th Embodiment of this invention. (B) is a perspective view which shows the rotation transmission pulley 14 in (a). In (a), the rotation transmission pulley 14 is shown in a simplified manner. (A)-(b) is a figure corresponding to Drawing 3 (a)-(b) in the horizontal blind of a 5th embodiment of the present invention. (A)-(b) is a figure corresponding to Drawing 3 (a)-(b) with a horizontal blind of a 6th embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic items shown in the following embodiments can be combined with each other. In addition, the invention is independently established for each feature.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the horizontal blind shown in FIGS. 1 to 12, a plurality of slats 3 are suspended from a hollow head box 1 via a plurality of ladder cords 2, and a bottom rail 4 is suspended from the lower end of the ladder cord 2. Supported below. The ladder cord 2 is a form of “slat support cord”. The structure of the “slat support cord” is not limited as long as it can support and rotate the slat 3. For example, the slat support cord includes two warps separated from each other, and one warp is provided on one edge of the slat. A configuration may be employed in which the other warp is attached to the other edge of the slat.

  A plurality of support members 5 are disposed in the head box 1, and a tilt drum 6 is rotatably supported by the support members 5. The upper end portion of the ladder cord 2 is attached to the tilt drum 6, and the angle adjusting shaft 7 is fitted and inserted into all the tilt drums 6 at the center portion of the tilt drum 6. Therefore, when the angle adjusting shaft 7 is rotated, all the tilt drums 6 are rotated, and one of the warp yarns of the ladder cord 2 is pulled up as the tilt drum 6 rotates, whereby each slat 3 and bottom rail. 4 is angle adjusted in phase.

  An operation rod 8 made of a cylinder is suspended and supported at one end of the head box 1, and a support case 11 is provided at the lower end of the operation rod 8. When the operation rod 8 is rotated by holding the support case 11, the angle adjustment shaft 7 is rotated via a gear mechanism disposed in the head box 1. Therefore, the angle of each slat 3 can be adjusted by rotating the operation rod 8. The support case 11 functions as a case for supporting a rotation resistor 15 described later, and also functions as a grip for facilitating the operation of the operation rod 8.

  A plurality (three in this embodiment) of lifting / lowering cords 9l, 9c, 9r (simply referred to as “elevating / lowering cord 9” when distinction is unnecessary) are suspended from the head box 1, and each of the lifting / lowering cords is suspended. One end of 9 is attached to the bottom rail 4. A turning pulley 21 is pivotally supported on each support member 5 by an axial center 23 in the front-rear direction, and an elevating cord 9 introduced into the head box 1 can be guided to turn in the left-right direction of the head box. Each support member 5 has a space through which other lifting cords can pass in the left-right direction. Therefore, as shown in FIG. 2, the other end of the right end elevating cord 9r is turned and guided by the support member 5, and the non-operating side elevating cord (left end and middle elevating cords 9l and 9c in FIG. 2) is supported by each. Through the member 5, the inside of the head box 1 is guided in the direction of the operation rod 8. Then, after passing through a stopper portion 16 and a guide roller 31 a (shown in FIG. 4) provided in the head box 1, the tube is inserted into the cylindrical operation rod 8. As shown in FIG. 9A, the other end of the lifting / lowering cord 9 is connected to one end of the ball chain 12 at the connection portion 13, and the other end of the ball chain 12 passes through the passage 11 d in the support case 11. Are attached to the code equalizer 10. The connection method of the lifting / lowering cord 9 and the ball chain 12 is not particularly limited, and the lifting / lowering cord 9 and the base cord 12a may be connected or the lifting / lowering cord 9 and the ball 12b may be connected. Examples of the connection method of the lifting / lowering cord 9 and the ball chain 12 include welding, bonding, sewing, caulking, fastening, and engagement between a knotted ball and a hole. The ball chain 12 is configured by arranging a large number of balls 12b at substantially equal intervals along a base cord 12a. In the present embodiment, as shown in FIG. 3, the cord to which the lifting / lowering cord 9 and the ball chain 12 are connected is the tension cord 19, and the side led out from the head box 1 and attached to the bottom rail 4 is the tension cord. 19 is a support side 19 s, and a side led out from the head box 1 and attached to the cord equalizer 10 is an operation side 19 o of the tension cord 19. As shown in FIG. 3, the support side 19 s and the operation side 19 o are derived from different positions of the head box 1. In this example, the operation side 19o is derived from a position different from the position where the lifting / lowering cord 9 is derived. However, the operation side 19o may be derived from the same position as the position where one of the lifting / lowering codes 9 is derived. As the bottom rail 4 is raised, the lead-out length of the support side 19s of the tension cord 19 is shortened, and the lead-out length of the operation side 19o of the tension cord 19 is lengthened. The support side 19s and the operation side 19o of the tension cord 19 are functional concepts that vary depending on the height position of the bottom rail 4. Which range of the tension cord 19 is the support side 19s and which range is the operation side 19o. It cannot be drawn, and the same portion of the tension cord can be the support side 19s and the operation side 19o.

  The stopper portion 16 is a heart cam stopper in one example, and a specific configuration example will be described below. As shown in FIG. 4, a case 32 of the stopper portion 16 is fixed to the support member 5 in the vicinity of the gear box 31 in the head box 1.

  A carriage 33 is supported in the case 32 so as to be movable in the longitudinal direction of the head box 1. An insertion portion 34 for inserting the lifting / lowering cord 9 is formed in the lower portion of the carriage 33.

  A hold spring 35 is disposed at the center of the carriage 33. As shown in FIG. 5, the hold spring 35 is formed by removing the central portion of the elastic metal plate and bending both ends into a cylindrical shape to form the pressing portions 36 a and 36 b of the lifting / lowering cord 9. 36a and 36b are disposed in the carriage 33 in a state of being folded in half so as to face each other.

  The carriage 33 is provided with a mountain-shaped portion 33a protruding between the pressing portions 36a, 36b of the hold spring 35, the hold spring 35 is positioned in the vertical direction by the mountain-shaped portion 33a, and the longitudinal direction of the head box 1 with respect to the carriage 33 That is, in FIG. 4, it is supported so as not to move in the left-right direction.

  Further, the pressing portions 36a and 36b can be bent in a direction away from the mountain-shaped portion 33a. A first pulley 38 is rotatably supported at the end of the case 32 on the gear box 31 side. A second pulley 39 is rotatably supported at the end of the case 32 on the support member 5 side.

  The lifting / lowering cord 9 is inserted from the gear box 31 to the lower side of the first pulley 38 and guided into the support members 5 between the pressing portions 36 a and 36 b of the hold spring 35 and the second pulley 39. And it is guided below the head box 1 via a pulley 21 in the support member 5.

  The holding spring 35 sandwiches the lifting / lowering cord 9 by the pressing portions 36a and 36b by the spring force. Accordingly, a predetermined frictional force acts between the pressing portions 36 a and 36 b and the lifting / lowering cord 9, and when the lifting / lowering cord 9 moves in the case 32, the carriage 33 is moved together with the hold spring 35. .

  Further, when the movement of the carriage 33 is prevented in the case 32, the movement of the hold spring 35 is inhibited, so that the lifting / lowering cord 9 moves while friction with the pressing portions 36a and 36b.

  A stopper cam 40 is rotatably supported on the case 32 above the second pulley 39. That is, the stopper cam 40 is supported so that its base end portion can turn with respect to the case 32 with the shaft 41 as a rotation fulcrum, and the shaft 41 is located above the second pulley 39.

  The distal end portion of the stopper cam 40 is formed as a curved surface facing the outer peripheral surface of the second pulley 39, and a gear-like unevenness is formed as a non-slip 42 on the peripheral surface.

  When the stopper cam 40 rotates toward the second pulley 39, the slip stopper 42 reaches the vicinity of the outer peripheral surface of the second pulley 39, and the distance between the slip stopper 42 and the outer peripheral surface of the second pulley 39 is as follows. The diameter of the lifting / lowering cord 9 is set to be sufficiently smaller.

  Therefore, even if the lifting / lowering cord 9 moves further in the slat lowering direction with the lifting / lowering cord 9 sandwiched between the stopper cam 40 and the second pulley 39 as shown in FIG. The above movement is prevented.

  Further, engaging projections 43 are formed on both side surfaces of the stopper cam 40, respectively. A pair of support pieces 44 extending on both sides of the stopper cam 40 are formed on the stopper cam 40 side of the carriage 33, and the stopper cam 40 rotates between the support pieces 44.

  On the upper edge of each support piece 44, an engagement recess 45 is formed in which the engagement protrusion 43 is engaged. The engaging recess 45 is formed downward from the upper edge of each support piece 44, and an inclined surface 46 is formed on the upper side edge on the stopper cam 40 side so as to increase in width toward the stopper cam 40 side. It has become.

  When the carriage 33 moves forward toward the stopper cam 40 as shown in FIG. 4, the engagement protrusion 43 is guided downward in the engagement recess 45, the stopper cam 40 rotates downward, and the carriage 33 is When retracted in the direction away from the stopper cam 40, as shown in FIG. 7, the engaging protrusion 43 is guided on the inclined surface of the engaging recess 45, and the stopper cam 40 is rotated upward.

  A cam mechanism 47 is formed between the carriage 33 and the case 32. That is, below the first pulley 38, the cam shaft 48 is supported on the bottom surface of the case 32 so as to be movable only in the front-rear direction of the head box 1.

  A guide groove 49 for guiding the cam shaft 48 is formed on the lower surface of the carriage 33. As shown in FIG. 6, the guide groove 49 stops at each position P1 to P4 while rotating the cam shaft 48 in order of the first to fourth positions P1 to P4 as the carriage 33 moves. It comes to hold.

  Next, the operation of the stopper portion 16 configured as described above will be described. As shown in FIG. 4, in the state where the lifting / lowering cord 9 is sandwiched between the stopper cam 40 and the second pulley 39, the movement of the lifting / lowering cord 9 in the slat lowering direction is prevented. At this time, the cam shaft 48 is located at the first position P1 in the guide groove 49.

  When the lifting / lowering cord 9 is pulled out from the head box 1 from this state, the lifting / lowering cord 9 moves in the direction of arrow A, and the carriage 33 moves in the same direction. Then, the cam shaft 48 moves from the first position P1 to the second position P2, and further movement of the carriage 33 in the same direction is prevented.

  At this time, as the carriage 33 moves, the stopper cam 40 rotates upward, and as shown in FIG.

  If the lifting / lowering cord 9 is released from this state, the lifting / lowering cord 9 moves in the direction of arrow B and the carriage 33 moves in the same direction due to the weight of the slat 3 and the bottom rail 4.

  Then, the cam shaft 48 moves from the second position P2 to the third position P3, and further movement is prevented. Therefore, after the carriage 33 moves slightly in the direction of the arrow B, further movement in the same direction is prevented and stops in the state shown in FIG.

  In this state, since the sandwiching of the lifting / lowering cord 9 by the stopper cam 40 is maintained in a released state, the lifting / lowering cord 9 resists friction with the hold spring 35 based on the weight of the slat 3 and the bottom rail 4. To move in the direction of arrow B. Accordingly, the slat 3 and the bottom rail 4 are lowered by their own weight.

  In the state shown in FIG. 8, after the slat 3 is lowered to a desired position and then the lifting / lowering cord 9 is pulled out, the carriage 33 moves in the direction of arrow A, and the camshaft 48 moves from the third position P3 to the fourth position P4. Move to.

  Then, further movement of the carriage 33 in the same direction is prevented, and the stopper cam 40 is maintained in a state in which the sandwiching of the lifting / lowering cord 9 is released as shown in FIG. In this state, the lifting / lowering cord 9 can be pulled out from the head box 1 and the slat 3 can be pulled up to a desired position.

  When the lifting / lowering cord 9 is released from the state where the cam shaft 48 is located at the fourth position P4, the lifting / lowering cord 9 moves in the direction of arrow B due to the weight of the slat 3 and the bottom rail 4, and the carriage 33 moves in the same direction. Move to.

  Then, as shown in FIG. 4, the stopper cam 40 is rotated downward to sandwich the lifting / lowering cord 9 with the second pulley 39, thereby preventing the lifting / lowering cord 9 from moving in the same direction. The weight drop of the slat 3 and the bottom rail 4 is prevented.

  At this time, the cam shaft 48 moves from the fourth position P4 to the first position P1 and stops.

  As described above, the stopper portion 16 is configured to be switchable between a locked state that prevents the tension cord 19 (elevating cord 9) from being driven and a released state that allows the tension cord 19 (elevating cord 9) to move. Yes. Moreover, the stopper part 16 is provided with the cancellation | release state maintenance function which maintains the said cancellation | release state while the dead weight of the bottom rail 4 falls. Further, the stopper portion 16 is released by pulling the tension cord 19 when the stopper portion 16 is in the locked state, and is brought into the locked state by pulling the tension cord 19 when the stopper portion 16 is in the released state. It is comprised so that it may become. In the case of a movable roller type stopper provided at the cord outlet of the head box as in Patent Document 1, the bottom rail can be lowered by its own weight by releasing the stopper portion by pulling the tension cord obliquely. If the tension cord flutters and touches the moving roller while the rail is descending its own weight, the stopper may be locked again and the bottom rail's own weight may stop descending. On the other hand, after the stopper portion 16 is released, the stopper portion 16 does not enter the locked state until the tension cord is pulled again. Therefore, it is possible to avoid the stopper portion 16 from being locked inadvertently while the bottom rail 4 is lowered by its own weight.

Next, the structure of the support case 11 and the members inside the support case 11 will be described in detail with reference to FIGS.
The support case 11 includes a support base 11a and a cover 11b (shown in FIG. 1) fixed to the support base 11a. The cylindrical portion 14f of the rotation transmission pulley 14 is inserted into the pulley bearing portion 11e of the support base 11a, and the rotation transmission pulley 14 is rotatably supported with respect to the support base 11a. A center shaft 15b having a non-circular cross section of the rotation resistor 15 is fitted into the fitting hole 14e of the rotation transmission pulley 14, so that the center shaft 15b rotates integrally with the rotation transmission pulley 14. A case 15 a of the rotation resistor 15 is accommodated in the accommodation portion 14 d of the rotation transmission pulley 14.

  The rotation transmission pulley 14 has a plurality (six in this embodiment) of engaging projections 14a protruding in the radial direction from the annular main body portion 14g and arranged at equal intervals in the circumferential direction. The inner surface of the recess 14c between the mating protrusions 14a is shaped to engage the ball 12b. The main body portion 14g and the engagement protrusion 14a are disposed in the pulley accommodating portion 11g of the support base 11a. In this state, when the ball chain 12 moves so as to pass through the passage 11d, the ball 12b is engaged with the recess 14c, and the rotation transmission pulley 14 rotates. Further, the side wall 11a1 of the support case 11 prevents the ball 12a from escaping in the radial direction. Each engaging protrusion 14a is provided with a cord insertion groove 14b through which the lifting / lowering cord 9 and the base code 12a of the ball chain 12 can be inserted. As shown in FIG. 10B, the width W of the cord insertion groove 14b is larger than the diameter of the base cord 12a, and there is a gap between the side wall 11a1 of the support case 11 and the rotation transmission pulley 14. The base cord 12a is not engaged with the cord insertion groove 14b. When the lifting / lowering cord 9 is not engaged with the cord insertion groove 14b, the width W of the cord insertion groove 14b is preferably larger than the sum of the diameters of the plurality of lifting / lowering cords 9. However, as shown in FIG. 10C, even when the width W of the cord insertion groove 14b is smaller than the sum of the diameters of the plurality of (three in this embodiment) lifting / lowering cords 9, the inner surface of the cord insertion groove 14b. By making the torque generated by the friction between the lifting / lowering cord 9 smaller than the minimum torque required for the rotation of the rotation transmission pulley 14, the lifting / lowering cord 9 can be slid with respect to the cord insertion groove 14b. .

  The rotation resistor 15 includes a case 15a, a central shaft 15b protruding in the axial direction from the case 15a, and a rotation restricting protrusion 15c protruding in the radial direction from the case 15a. The rotation resistor 15 is fixed to the cover 11b so as not to rotate when the rotation restricting projection 15c is engaged with the cover 11b. The case 15a and the cover 11b may be integrated instead of separate. Further, the fitting recess between the rotation restricting protrusion 15c and the cover 11b may be omitted. Since the rotation resistor 15 is configured to generate rotation resistance when the center shaft 15b rotates relative to the case 15a, the rotation resistance when the center shaft 15b rotates as the rotation transmission pulley 14 rotates. Will occur.

  The configuration of the rotation resistor 15 is not particularly limited as long as the rotation resistance is generated by the rotation of the central shaft 15b relative to the case 15a. The configuration of the rotation resistor 15 is not particularly limited. Is moved and moving members (eg, pistons, wings, screws) move in the viscous fluid with the rotation of the central shaft 15b (eg: rotational movement, linear movement; linear movement is rotation of the central axis by screw feed, etc.) By using a mechanism for converting to linear movement inside the case), or configured to rotate with the central shaft 15b as the central shaft 15b rotates. A friction member (eg, rubber or governor metal) is pressed against the inner surface of the case 15a or a surface fixed in the case by centrifugal force to generate frictional resistance. Which resistance is configured to generate the magnetic body and the metal relatively moving or rotating, and air resistance damper due to the rotation blade. When the rotational input with respect to the central axis is in the upward direction of the blind, it is preferable to provide a one-way function that reduces or does not cause rotational resistance. The one-way function may be configured outside the rotation resistor 15, for example, by providing a one-way clutch between the center shaft 15 b and the pulley, and the configuration in which the rotation restricting projection 15 c and the cover 11 b are not engaged during the upward rotation. (Co-rotation) may be used. Further, the rotation resistor 15 is of a type in which the resistance value changes depending on the rotation position of the rotation input with respect to the central axis (or the number of rotations from a predetermined state) (for example, a resistance in the rotation resistor 15). When the body moves with the rotation input, the resistance value changes). When rotating in the descending direction of the shielding material, the resistance value is set to change as the number of rotations increases. It is preferable to do.

  Since the configuration using the resistance force generated when the moving member moves in the viscous fluid has a simple configuration, there is an advantage that the size can be easily reduced. On the other hand, in the configuration using the centrifugal force, when the rotational speed of the central shaft 15b is small, the rotational resistance becomes very small, so that the braking force when the bottom rail 4 approaches the lower limit position and the descending speed decreases is very low. Becomes smaller. For this reason, generation | occurrence | production of the problem that the bottom rail 4 does not go down to a minimum position can be suppressed.

Here, the operation of the horizontal blind according to the present embodiment will be described.
As shown in FIG. 1, when the bottom rail 4 is in the lower limit position, the code equalizer 10 is brought into contact with the lower surface of the support case 11 as shown in FIGS. 1 to 3A and 9A. The ball 12b of the ball chain 12 is engaged with the recess 14c of the rotation transmission pulley 14. In this state, when the operation side 19o of the tension cord 19 is pulled down, the rotation transmission pulley 14 rotates counterclockwise as shown in FIG. 9A, and the lead-out length of the lifting / lowering cord 9 from the head box 1 (that is, the tension cord 19). The lead-out length of the support side 19s) is shortened, and the bottom rail 4 is raised as shown in FIG. As the rotation transmission pulley 14 rotates, the central shaft 15b of the rotation resistor 15 rotates, so that rotation resistance is generated. At this time, if the above-described one-way function is provided, the rotational resistance at the time of ascent is reduced or does not act, so that the ascending operating force can be reduced as compared with when the one-way function is not provided.

  After the operation side 19o of the tension cord 19 is continuously pulled down and the connecting portion 13 passes through the rotation transmission pulley 14, the lifting cord 9 passes through the cord insertion groove 14b of the rotation transmission pulley 14. In the present embodiment, since the lifting / lowering cord 9 is not engaged with the cord insertion groove 14b, the rotation transmission pulley 14 is not rotated as the lifting / lowering cord 9 moves.

  FIGS. 3B and 9B show a state after the operating side 19o of the tension cord 19 is pulled down and the bottom rail 4 reaches the vicinity of the upper limit position. When the hand is released from the tension cord 19 in this state, the stopper portion 16 is operated and the stopper portion 16 holds the lifting / lowering cord 9 so that the bottom rail 4 does not descend by its own weight.

  In this state, when the operation side 19o of the tension cord 19 is slightly pulled down, the locked state of the lifting / lowering cord 9 at the stopper portion 16 is released, and the bottom rail 4 is lowered by its own weight.

  As the bottom rail 4 is lowered by its own weight, the ball chain 12 moves toward the head box 1, and when the ball chain 12 reaches the rotation transmission pulley 14, the rotation transmission pulley 14 starts to rotate. Then, when the central shaft 15b of the rotation resistor 15 rotates with the rotation of the rotation transmission pulley 14, a rotation resistance is generated. Therefore, a braking force is applied to the movement of the ball chain 12, and the speed at which the bottom rail 4 lowers its own weight. Reduced. Further, since the braking force acts on the ball chain 12 at once, resistance is evenly applied to the plurality of lifting cords 9 and the bottom rail 4 is lowered in parallel. When a rotational resistor that depends on the rotational speed is used, the dead weight of the shielding material (in this embodiment, the total weight of the bottom rail 4 and the weight of the slat 3 supported on the bottom rail 4) decreases. As the lowering speed of the bottom rail 4 decreases, the rotational resistance decreases and the bottom rail 4 descends to the lower limit. When a rotational resistor that depends on the rotational position is used, as the position of the bottom rail 4 is lowered (the engagement position of the chain is changed), the position of the resistor inside the rotational resistor moves, and accordingly the central axis Rotational resistance decreases and the bottom rail 4 descends to the lower limit.

  By the way, when the stopper portion 16 is configured to pass the lifting / lowering cord 9 but not the ball chain 12, the ball chain 12 is drawn into the head box 1 as the bottom rail 4 descends, and the stopper portion. When 16 is reached, the ball chain 12 interferes with the stopper portion 16 and the bottom rail 4 descends. Therefore, in the present embodiment, the ball chain 12 is disposed so that the ball chain 12 does not reach the stopper portion 16 until the bottom rail 4 reaches the lower limit position, and preferably the ball chain 12 does not reach the head box 1. doing. For this reason, the region where the rotation resistor 15 can be rotated is the stopper portion 16 or the head box 1 after the first ball 12bs (illustrated in FIG. 9A) of the ball chain 12 reaches the rotation transmission pulley 14. Depends on the moving distance of the ball chain 12 until reaching. And in order to lengthen this movement distance, the rotation resistor 15 should just be arrange | positioned in the position as far as possible from the head box 1, Therefore, in this embodiment, the rotation resistor 15 is the front-end | tip part of the operation stick | rod 8. The support case 11 is attached to the support case 11.

  When the configuration of this embodiment is applied to a horizontal blind that has already been installed, the operation rod, grip, and lifting / lowering cord of the horizontal blind are connected to the operation rod 8 and support case (damper, pulley, It is only necessary to replace the assembly 11 and the tension cord 19 (the cord to which the lifting / lowering cord 9 and the ball chain 12 are connected), and there is no need to arrange new components in the head box 1. Therefore, the configuration of the present embodiment can be easily applied to the already installed horizontal blind. Further, since no new parts are arranged in the head box 1, the head box 1 is not increased in size.

The present invention can also be implemented in the following modes.
The present invention is also applicable to a shielding device whose shielding material is other than slats. In this case, the tilt drum, the shaft, and the tilt rotation transmission mechanism may be omitted. In this case, it is not an operation bar (tilt operation in this embodiment) but a support bar.

In the above embodiment, the elevating cord and the chain are inserted into the operation rod. For example, a non-cylindrical support member for supporting the rotation resistor from the head box may be supported in a suspended manner, and the support member may be supported by the support member.
-Moreover, you may comprise so that a rotation resistor may be supported by objects (window frame etc.) fixedly installed in housings and housings, such as a wall surface adjacent to a shielding apparatus. Specifically, in the form shown in FIG. 13, one end of the two lifting cords 9 l and 9 r is attached to the bottom rail 4, and the other end passes through the head box 1 and is adjacent to the suspended position of the operation rod 8. It is led out from a cord outlet 26 provided at the position. A ball chain 12 is connected to the other ends of the lifting cords 9l and 9r, and a knob 27 is attached to the tip of the ball chain 12. A support base 11a is fixed with a screw 29 or the like to a window frame 25 fixedly installed on a wall surface adjacent to a horizontal blind 30 which is a shielding device. A rotation transmission pulley 14 and a rotation resistor 15 are mounted on the support base 11a to form a damper / pulley assembly, and a cover is attached to the support base 11a. Even in such a form, by engaging the ball chain 12 with the rotation transmission pulley 14 as in the above embodiment, an input rotation is applied to the rotation resistor 15 as the weight of the bottom rail 4 is lowered to generate a rotation resistance. Can be made.
In the above embodiment, the rotation resistor 15 is provided on the support case 11 attached to the tip of the operation rod 8 (that is, the tip of the support rod). You may provide in a position.
The present invention can also be applied to a shielding device that does not have a bottom rail (a scooping curtain, a roll-up blind, etc.). This is because even in such a shielding device, the shielding material can be raised and lowered by changing the lead-out length of the tension cord on the support side.
In the above embodiment, the case 15a of the rotation resistor 15 is fixed and the central shaft 15b is rotated. However, the rotation resistance is generated by fixing the central shaft 15b and rotating the case 15a. May be. In this case, instead of using the rotation transmission pulley 14, the ball chain 12 may be engaged with the outer periphery of the case 15a and the case 15a may be rotated to generate rotational resistance.
In the above embodiment, the rotational resistance 15 is generated only in the portion of the ball chain 12, but the bottom rail 4 is lowered so that the rotational resistance is also generated in the portion of the lifting / lowering cord 9 that passes through the rotational resistor 15. A rotational resistance may be generated over the entire length of the range. For example, when the width of the cord insertion groove 14b is narrowed or the code insertion groove 14b is formed in a V shape, the lifting / lowering cord 9 is engaged with the cord insertion groove 14b to transmit rotation as the lifting / lowering cord 9 moves. The pulley 14 can be configured to rotate.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment and will be described below with a focus on differences.

  FIG. 14 shows the positional relationship between the cord equalizer 10 and the support case (damper / pulley / assembly) 11 when the bottom rail 4 is lowered to the vicinity of the lower limit position. In this state, the cord equalizer 10 is disposed near the lower surface 11f of the support case 11, but is not in contact with the lower surface 11f.

  In the self-weight lowering type shielding device, normally, as the bottom rail 4 is lowered, the ratio of the load of the shielding material supported by the ladder cord 2 and the head box 1 increases, and the load applied to the lifting / lowering cord 9 decreases. The shielding device always has the resistance of each part, and when it is lowered in the direction of extending the bending state of the shielding material like a pleated screen or honeycomb screen, there is also the resistance of the shielding material itself, so it can only overcome the total resistance. If the load does not act on the bottom rail 4, the bottom rail 4 may not reach the lower limit position.

  In order to prevent such a phenomenon from occurring, in this embodiment, as shown in FIG. 14A, when the lowest ball 12be of the ball chain 12 passes through the rotation transmission pulley 14, as shown in FIG. ), The ball 12be is arranged so that the bottom rail 4 does not reach the lower limit position, and a region R in which no ball is arranged is provided between the ball 12be and the code equalizer 10. According to such a configuration, the lowering speed of the bottom rail 4 is reduced to an appropriate speed while a large number of balls 12b of the ball chain 12 pass through the rotation transmission pulley 14 as in the first embodiment, and the balls 12be. Passes through the rotation transmission pulley 14, and as shown in FIG. 14 (b), the rotation transmission pulley 14 does not rotate while the region R where no balls are arranged passes through the rotation transmission pulley 14, so that rotation resistance is generated. First, as shown in FIG. 15B, the bottom rail 4 easily reaches the lower limit position.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG. The present embodiment is similar to the second embodiment, and hereinafter, differences will be mainly described.

  In the configuration of the second embodiment, no rotational resistance is generated after the ball 12be has passed through the rotation transmission pulley 14, so that the lowering speed of the bottom rail 4 may be too high depending on the configuration of the shielding device.

  Therefore, in the present embodiment, as shown in FIG. 16, the ball 12 bf is arranged so that the bottom rail 4 does not reach the lower limit position when the specific ball 12 bf of the ball chain 12 passes through the rotation transmission pulley 14. The pitch at which the balls 12b are provided between the balls 12bf and the cord equalizer 10 is increased (for example, twice as long), and the cord (for example, the base cord 12a) that does not engage with the rotation transmission pulley 14 is used between these pitches. According to such a configuration, since the rotation speed of the rotation transmission pulley 14 is reduced after the ball 12bf passes through the rotation transmission pulley 14, the rotation resistance generated by the rotation resistor 15 is reduced. In the second embodiment, the rotational resistance suddenly disappears after the ball 12be passes through the rotation transmission pulley 14, but in this embodiment, a certain amount of rotational resistance remains after the ball 12bf passes through the rotation transmission pulley 14. The lowering speed of the bottom rail 4 does not become too large. Therefore, according to this embodiment, the bottom rail 4 can reach the lower limit position without the lowering speed of the bottom rail 4 becoming too large.

In the present embodiment, the pitch _{P L} than ball 12Bf provided a ball 12b at the lower side more than twice is preferable for the pitch _{P U} in above the ball 12Bf. If it is greater than 1 and less than 2 times, when one of the two adjacent balls 12b is engaged with the recess 14c of the rotation transmission pulley 14, the other ball 12b is engaged with the recess 14c. It is because it is easy to collide with the engaging protrusion 14a without being combined. Pitch _{P L} is an integral multiple (2 times, 3 times, etc.) of the pitch _{P U} is preferably.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment and will be described below with a focus on differences.

  In the present embodiment, as shown in FIG. 17A, instead of the ball chain 12, a columnar columnar cord 18 is connected to the plurality of lifting / lowering cords 9 at the connection portion 13. Moreover, as the rotation transmission pulley 14, as shown in FIG.17 (b), the thing of the structure which can be engaged with the columnar cord 18 is used. The columnar cord 18 preferably has a larger outer diameter than the lifting / lowering cord 9. In this case, the contact area between the columnar cord 18 and the rotation transmission pulley 14 is increased, and the columnar cord 18 is less likely to slip with respect to the rotation transmission pulley 14.

  In one example, the columnar cord 18 is configured by covering an inner core formed of a polyester resin or a polyamide resin with an outer cord knitted with nylon or a polyester resin. With this configuration, the linearity of the columnar cord 18 is ensured by the center core, durability in the extending direction can be ensured, and collapse in the reduced diameter direction can be prevented.

  As shown in FIG. 17B, the rotation transmission pulley 14 includes first and second claw portions 117 and 118 that protrude radially outward, and a recess 17 is provided between the claw portions 117 and 118. . A large number of claw portions 117 and 118 are provided at equal intervals in the circumferential direction. The claw portions 117 and 118 include protrusions 117b and 118b that protrude from the base portions 117a and 118a toward the concave portion 17, respectively. The protrusions 117b and 118b bite into the columnar cord 18, so that the columnar cord 18 is a rotation transmission pulley. 14 is engaged. Further, since the claw portions 117 and 118 are alternately arranged in the circumferential direction, the columnar cord 18 engages with the rotation transmission pulley 14 while meandering, whereby the columnar cord 18 and the rotation transmission pulley 14 are engaged. The holding power of is increased.

  In the present embodiment, when the columnar cord 18 moves toward the head box 1 as the weight of the bottom rail 4 is lowered, the rotation transmission pulley 14 is rotated, and the rotation resistor 15 is rotated by the rotation, thereby rotating resistance. Is generated, and the lowering speed of the bottom rail 4 is reduced.

  Even when the rotation transmission pulley 14 is rotated using the columnar cord 18 as in the present embodiment, the rotation resistance is reduced as the bottom rail 4 approaches the lower limit position as shown in the second to third embodiments. It can be constituted as follows.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment and will be described below with a focus on differences.

  In this embodiment, the rotation transmission pulley 14 rotates with the movement of the ball chain 12, and the rotation is transmitted to the rotation resistor 15, so that a rotation resistance is generated and the lowering speed of the bottom rail 4 is reduced. The point is common to the first embodiment. On the other hand, in this embodiment, the rotation transmission pulley 14 and the rotation resistor 15 are disposed in the head box 1. The rotation transmission pulley 14 is supported so as to be rotatable with respect to the head box 1, and the case 15 a of the rotation resistor 15 is supported so as not to rotate with respect to the head box 1. A pressing body 101 having an inner wall shaped along the outer peripheral surface of the rotation transmission pulley 14 is provided adjacent to the rotation transmission pulley 14. The ball chain 12 is inserted between the rotation transmission pulley 14 and the presser body 101. When the bottom rail 4 is lowered by its own weight, a force in a direction away from the rotation transmission pulley 14 is applied to the ball chain 12, but the ball chain 12 escapes in the radial direction when the ball chain 12 abuts against the inner wall of the pressing body 101. The rotation transmission pulley 14 is reliably rotated as the ball chain 12 moves. When the central shaft 15b of the rotation resistor 15 rotates with the rotation of the rotation transmission pulley 14, rotation resistance is generated. In the present embodiment, a grip 51 is provided at the lower end of the operation rod 8. The grip 51 is provided so that the operation rod 8 can be easily rotated.

  Since the stopper portion 16 has a configuration suitable for holding the lifting / lowering cord 9, when the ball chain 12 reaches the stopper portion 16 in the movable range of the bottom rail 4, the stopper portion 16 12 cannot be held properly, and the bottom rail 4 falls by its own weight. Therefore, in this embodiment, the tension cord 19 is routed in the head box 1 so that the ball chain 12 does not reach the stopper portion 16 in the movable range of the bottom rail 4 (between the upper limit position and the lower limit position). . Here, a specific configuration example will be described with reference to FIG. As shown in FIG. 18 (a), the stopper portion 16 is disposed at the substantially left end of the head box 1, a turning pulley 20 is disposed at the left end side of the head box 1, and the rotation transmission pulley 14 and the rotation resistor 15 are disposed. Is arranged on the right end side of the head box 1. The turning pulley 20 has the same configuration as the rotation transmission pulley 14. The tension cord 19 is hung on the turning pulley 20 and the rotation transmission pulley 14, the operation side 19 o is suspended from the rotation transmission pulley 14 side, and the support side 19 s is suspended via the stopper portion 16.

  According to such a configuration, since the length of the tension cord 19 between the stopper portion 16 and the rotation transmission pulley 14 is increased, the bottom rail 4 is in the lower limit position as shown in FIG. When the lifting / lowering cord 9 is inserted into the stopper portion 16 and the bottom rail 4 is raised to near the upper limit as shown in FIG. 18B, the ball chain 12 is hooked on the rotation transmission pulley 14. can do. Therefore, when the bottom rail 4 is not lowered, the stopper 16 can reliably prevent the bottom rail 4 from lowering its own weight, and when the bottom rail 4 is lowered by its own weight, the lowering speed of the bottom rail 4 can be suppressed.

The present invention can also be implemented in the following modes.
In the above-described embodiment, the operation side 19o is inserted into the operation rod 8, but the operation side 19o does not need to be inserted into the operation rod 8 and is from a position different from the suspended position of the operation rod 8. It may be drooped.

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIG. The present embodiment is similar to the fifth embodiment, and hereinafter, differences will be mainly described.
In this embodiment, a columnar cord 18 is connected to the lifting / lowering cord 9 instead of the ball chain 12. The configuration of the columnar cord 18 is as described in the fourth embodiment. Further, as the rotation transmission pulley 14, as described in the fourth embodiment, one having a configuration suitable for engagement with the columnar cord 18 is used.
Also in this embodiment, when the bottom rail 4 is lowered by its own principle, when the bottom rail 4 is not lowered, the stopper 16 reliably prevents the bottom rail 4 from falling by its own weight while the bottom rail 4 is lowered by its own weight. The descending speed of the bottom rail 4 can be suppressed.

1: Head box, 2: Ladder cord, 213: Slat, 4: Bottom rail, 5: Support member, 6: Drum, 7: Angle adjustment shaft, 8: Operating rod, 9: Lifting cord, 10: Cord equalizer, 11 : Support case, 12: Ball chain, 13: Connection part, 14: Rotation transmission pulley, 15: Rotating resistor, 16: Stopper part, 19: Tension cord, 19s: Support side of tension cord, 19o: Operation of tension cord Side, 20: turning pulley, 101: holding plate

Claims (8)

A shielding device that raises and lowers a shielding material by pulling a tension cord or an object connected thereto,
The tension cord is configured by connecting separate resistance cords to a plurality of lifting cords provided on the shielding material side,
A shielding device in which an input rotation is applied to a rotating resistor by the resistance cord that is driven as the weight of the shielding material is lowered. In the shielding device, a support side and an operation side of the tension cord are led out from the head box, and the lead length on the support side of the tension cord is changed by pulling the tension cord or the object to raise and lower the shielding material. The shielding device according to claim 1, which is a shielding device to be operated. The shielding device according to claim 1, wherein the resistance cord is one of a ball chain and a cord having a diameter larger than that of the tension cord. A stopper portion configured to be switchable between a locked state that prevents the tension cord from being driven and a released state that allows movement of the tension cord;
The said stopper part is a shielding apparatus as described in any one of Claims 1-3 provided with the cancellation | release state maintenance function which maintains the said cancellation | release state while the dead weight of the said shielding material falls. The stopper portion can be released by pulling the tensile cord when the stopper portion is in a locked state, and by pulling the tensile cord when the stopper portion is in the released state. The shielding apparatus as described in any one of Claims 1-4 which can be in the said locked state. The said raising / lowering cord and the said resistance cord are connected by the connection method selected from welding, adhesion | attachment, sewing, crimping, knotting, and engagement of a knotted ball and a hole. The shielding apparatus as described in one. A pulley that engages the resistance cord, and a pressing body that is disposed adjacent to the pulley and has an inner wall shaped along the outer peripheral surface of the pulley,
The resistance cord is inserted between the pulley and the pressing plate, so that the pulley is rotated with the movement of the resistance cord, and an input rotation is applied to the rotating resistor with the rotation. The shielding device according to any one of claims 1 to 6. A stopper portion configured to be switchable between a locked state that prevents the tension cord from being driven and a released state that allows movement of the tension cord;
The shielding device according to claim 1, wherein the rotation resistor is provided closer to the operation side of the tension cord than the stopper portion.