JP6383260B2 - Elevating device for shielding material - Google Patents

Description

  The present invention relates to a device for raising and lowering a shielding material for a solar shading device such as a pleated screen, a roman shade, a horizontal blind, and a shielding material for a vertical folding partition door.

  Conventionally, the head box suspends and supports the solar shading material, hangs the lifting cord from the lifting cord winding shaft supported rotatably in the head box, and connects the lower end of the lifting cord to the lower end of the solar shading material In addition, there is disclosed an elevating device for a solar shading material configured such that the solar shading material can be pulled up based on rotational torque in the hoisting cord winding direction applied to the hoisting cord winding shaft by a spring (for example, Patent Documents). 1). In this solar shading lifting device, a constant load spring is wound around the lifting and lowering cord winding shaft, so that a constant rotational torque is applied regardless of the lifting and lowering of the solar shielding material, and the lifting and lowering cord winding shaft is inclined on the outer peripheral surface. A conical pulley that changes in three stages (small diameter part, intermediate part, and large diameter part) is attached so that the angle becomes steeper sequentially from the small diameter side toward the large diameter side. When the elevating cord is wound around the conical pulley and the elevating cord is fed out from the conical pulley and the solar shading material is lowered, the feeding end of the elevating cord from the conical pulley is moved from the small diameter side to the large diameter side of the conical pulley. Transition towards. That is, when the lifting / lowering cord winding shaft rotates in the lifting / lowering cord winding direction, the lifting / lowering cord is wound from the large diameter side to the small diameter side of the conical pulley.

  On the other hand, the constant load spring is rotatably supported in the vicinity of the lifting / lowering cord winding shaft in a state where the spring steel is wound in a spiral shape, and the tip of the constant load spring is attached to a pulley fitted to the lifting / lowering cord winding shaft. Wound up. The constant load spring is fed from the pulley by the rotation of the lifting / lowering cord winding shaft in the lifting / lowering cord winding direction, and is wound around the pulley by the rotation of the lifting / lowering cord winding shaft in the lifting / lowering cord feeding direction. The constant load spring can apply a constant rotational torque to the lifting / lowering cord winding shaft in the winding direction of the lifting / lowering cord regardless of the winding amount of the pulley. Also, as the lifting cord is extended from the conical pulley and the slat is lowered, the weight of the slat acting on the lifting cord decreases linearly, whereas it acts on the lifting cord via the conical pulley based on the rotational torque of the constant load spring. The lifting load to be reduced is configured to decrease in a quadratic curve at the small diameter part, the intermediate part, and the large diameter part of the conical pulley. Further, the lifting load is set so as to always exceed the slat weight.

  In the elevating device for solar shading material configured as described above, when the slat is lowered, the damping rate of the elevating load with respect to the slat descending distance can be changed in three stages by the small diameter part, the intermediate part and the large diameter part of the conical pulley. it can. Further, since the lifting load can be reduced in a quadratic curve at the small diameter part, the intermediate part and the large diameter part, the lifting cord is suspended and supported from the small diameter part and the large diameter part in the process of raising and lowering the slat. In the range, the load difference between the lifting load and the slat weight can be reduced. Further, since the lifting load can be set by the rotational torque of the constant load spring and the three-step inclination angle of the conical pulley, the lifting load having a small load difference from the slat weight can be set stably and easily. It is like that.

JP 2000-130052 (Claim 1, paragraphs [0030] to [0035], FIG. 1 and FIG. 2)

  However, in the conventional solar shading material lifting apparatus disclosed in Patent Document 1, when the solar shading material is formed of a hygroscopic material, the weight of the solar shading material changes depending on the humidity, or the lifting and lowering device Since the lifting load applied to the cord changes depending on the tension of the solar shielding material, the solar shielding material can be moved up and down unintentionally without maintaining the balance between the weight of the solar shielding material and the lifting load applied to the lifting cord. There was a bug. For this reason, in the raising and lowering device of the solar radiation shielding material shown in the above-mentioned conventional patent document 1, the urging force (elastic force) of the constant load spring and the weight of the weight in the bottom rail provided at the lower end of the solar radiation shielding material are finely defined. There is a problem that it is necessary to set, and the assembly work becomes troublesome.

  The object of the present invention is to lift and lower the shielding material, which does not require fine setting of the urging force of the cord winding urging member and the weight of the weight in the bottom rail, and can prevent the bottom rail from unintentionally moving up and down. To provide an apparatus.

  As shown in FIGS. 1 and 3, the first aspect of the present invention is a head rail 11, a shielding material 12 that is suspended from the head rail 11 and can be unfolded, and horizontally at the lower end or below the shielding material 12. A bottom rail 13 provided extending in the direction, a lifting / lowering cord 14 having a lower end coupled to the bottom rail 13, a winding drum 16 rotatably provided in the head rail 11 and winding the lifting / lowering cord 14 in a feedable manner. And a winder member 17 for urging the winding drum 16 to rotate in the direction of winding the lifting / lowering cord 14, and a rotatable member mounted in the head rail 11. Relative rotation between the center rod 18 in which the winding drum 16 is inserted so as not to rotate relative to the center rod 18 in the direction in which the winding rod 14 is wound up. The clutch portion 19 that enables or disables the rotation and disables or enables the relative rotation with the center rod 18 in the direction in which the lifting / lowering cord 14 is fed out, the outer ring portion 32 fixed to the head rail 11, and the relative rotation to the outer ring portion 32. The torque generator 21 further includes an inner ring portion 33 that can be inserted and connected to the clutch portion 19, and a torque generator 34 that is interposed between the inner ring portion 33 and the outer ring portion 32 and generates a predetermined torque. When the bottom rail 13 cannot be raised by the urging force of the cord winding urging member 17 and the bottom rail 13 can be lowered against the urging force of the cord winding urging member 17, the torque generating device 21 However, the weight of the shielding member 12 and the bottom rail 13 prevents the lifting / lowering cord 14 from being fed out from the winding drum 16, and the cord winding biasing member 17 is attached. When the bottom rail 13 can be raised by force and the bottom rail 13 cannot be lowered against the urging force of the cord winding urging member 17, the torque generating device 21 is connected to the cord winding urging member 17. The lift cord 14 is configured to be prevented from being wound around the winding drum 16 by the urging force.

  The second aspect of the present invention is an invention based on the first aspect, and further, as shown in FIGS. 1 and 3, the inner ring portion 33 of the torque generator 21 is loosely fitted to the center rod 18. It is connected to the clutch part 19.

  A third aspect of the present invention is an invention based on the first aspect, and further, as shown in FIGS. 9 and 10, the clutch with the inner ring portion 73 of the torque generating device 61 fitted into the clutch portion 59. It is connected to the part 59.

  A fourth aspect of the present invention is an invention based on the first aspect, and is characterized in that the cord winding biasing member 17 is a spiral spring as shown in FIG.

  A fifth aspect of the present invention is an invention based on the first aspect, and is characterized in that an operating lever 38 is provided on the bottom rail 13 as shown in FIG.

  A sixth aspect of the present invention is an invention based on the second or third aspect, further characterized in that a pulley is fitted on the center rod, and an operation chain is stretched over the pulley.

  In the lifting device according to the first aspect of the present invention, the clutch portion enables relative rotation with the center rod in the direction of winding the lifting cord and disables relative rotation with the center rod in the direction of feeding the lifting cord. When the bottom rail cannot be raised by the urging force of the cord winding urging member and the bottom rail can be lowered against the urging force of the cord winding urging member, the torque generator includes a shielding material and The lifting / lowering cord is prevented from being unwound from the winding drum by the weight of the bottom rail. As a result, the torque generated by the torque generating device acts on the center rod that rotates in conjunction with the rotation of the winding drum that winds and feeds the lifting / lowering cord via the clutch portion, thereby folding the shielding material. No load torque is generated for rotation of the center rod in the direction, and load torque is generated for rotation in the direction of deploying the shielding material, thereby preventing the shield and the bottom rail from descending due to their own weight. . As a result, the bottom rail can be prevented from unintentionally descending, and the urging force of the cord winding urging member and the weight of the weight in the bottom rail need not be set finely.

  In addition, the clutch portion disables relative rotation with the center rod in the direction in which the lifting / lowering cord is wound up and allows relative rotation with the center rod in the direction in which the lifting / lowering cord is fed out, and by the biasing force of the cord winding biasing member When the bottom rail can be raised and the bottom rail cannot be lowered against the urging force of the cord winding urging member, the torque generator causes the lifting cord to be wound by the urging force of the cord winding urging member. Stops being wound on the take-up drum. As a result, the torque generated by the torque generator acts on the center rod that rotates in conjunction with the rotation of the winding drum that winds and feeds the lifting / lowering cord via the clutch portion, thereby unfolding the shielding material. A load torque is not generated for the rotation in the direction, and a load torque is generated for the rotation of the center rod in the direction to fold up the shielding material, thereby preventing the bottom rail from rising. As a result, the bottom rail can be prevented from unintentionally rising, and the urging force of the cord winding urging member and the weight of the weight in the bottom rail need not be set finely.

  In the lifting device according to the second aspect of the present invention, since the inner ring portion of the torque generator is connected to the clutch portion in a state of loosely fitting to the center rod, the clutch portion and the torque generator have a longer overall length. These outer diameters can be reduced. As a result, the size of the clutch portion and the torque generator in the diameter direction can be made compact.

  In the lifting device according to the third aspect of the present invention, since the inner ring portion of the torque generating device is connected to the clutch portion in a state of being fitted into the clutch portion, the overall outer diameter of the clutch portion and the torque generating device is increased. However, their overall length can be shortened. As a result, the size in the longitudinal direction of the clutch portion and the torque generator can be made compact.

  In the lifting device according to the fourth aspect of the present invention, since the cord winding biasing member is a spiral spring, a biasing force (elastic force) that biases the winding drum to rotate in the direction of winding the lifting cord is provided. Can be constant.

  In the lifting device according to the fifth aspect of the present invention, since the operation lever is provided on the bottom rail, the shield can be moved up and down simply by gripping the operation lever and operating it in the vertical direction. As a result, the shield can be quickly moved up and down. Further, since no operation chain or pulley is required, the number of parts can be reduced.

  In the lifting device according to the sixth aspect of the present invention, since the pulley is fitted to the center rod and the operation chain is stretched over the pulley, the shield can be moved up and down by operating the operation chain. As a result, the shield can be folded up to the vicinity of the upper end without reaching the upper end of the shield.

It is a front view of the horizontal blind containing the raising / lowering apparatus of the shielding material of 1st Embodiment of this invention. It is a top view of the horizontal blind containing the raising / lowering apparatus. It is the sectional view on the AA line of FIG. 7 which shows the torque generator and clutch part of the raising / lowering apparatus. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a principal part perspective view containing the torque generator and clutch part of the raising / lowering apparatus. It is a side view of the horizontal blind containing the raising / lowering apparatus. It is a front view of the horizontal blind containing the raising / lowering apparatus of the shielding material of 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 3 which shows the torque generator and clutch part of the raising / lowering apparatus. It is the EE sectional view taken on the line of FIG.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
As shown in FIG.1 and FIG.8, the raising / lowering apparatus of a shielding material is applied to the pleats screen 10 in this embodiment. Further, the lifting / lowering device for the shielding material includes a head rail 11, a shielding material 12 suspended from the head rail 11, a bottom rail 13 that extends horizontally at the lower end of the shielding material 12, and a bottom rail 13 that has a lower end. And a lifting / lowering cord 14 coupled to the head rail 11 and a winding drum 16 rotatably provided in the head rail 11. The head rail 11 is attached to a ceiling, a wall, or a window frame so as to extend in the horizontal direction via a bracket 15 (FIG. 8). The shielding member 12 includes a plurality of folds 12a extending in the horizontal direction with a predetermined interval, and a plurality of shielding elements which are partitioned into a flat plate extending in the horizontal direction by the folds 12 and bent in a zigzag manner in the vertical direction. And a piece 12b. The shielding member 12 is configured such that the folding angle of the shielding element piece 12b at the fold 12a is increased when the shielding material 12 is deployed, and the bending angle of the shielding element piece 12b at the fold 12a is reduced when folded. A weight (not shown) is accommodated in the bottom rail 13. Further, the upper end of the lifting / lowering cord 14 is attached to a winding drum 16 and is wound around the winding drum 16 so as to be fed out. Reference numeral 12c in FIG. 1 is a plurality of through holes formed in the vertical center of the plurality of shielding pieces 12b in the vertical direction, and the elevating and lowering portions extending vertically in these through holes 12c. The cord 14 is loosely inserted.

  On the other hand, the lifting / lowering device for the shielding material includes a cord winding urging member 17 that urges the winding drum 16 to rotate in the direction in which the lifting / lowering cord 14 is wound, and a center that is rotatably mounted in the head rail 11. It further includes a rod 18, a clutch portion 19 fitted into the center rod 18, and a torque generator 21 provided adjacent to the clutch portion 19 and generating a predetermined torque (FIGS. 1 and 2). The center rod 18 is provided on the head rail 11 so as to extend in the longitudinal direction. The winding drum 16 is rotatably accommodated in a case 22 attached in the head rail 11 and is fitted into the center rod 18 so as not to be relatively rotatable. Thereby, the center rod 18 is rotatably attached to the head rail 11 through the case 22 together with the winding drum 16. The cord winding biasing member 17 is a spiral spring accommodated in the case 22 in this embodiment. The cord winding urging member 17 has its inner end fixed to the center rod 18 and its outer end fixed to the case 22 so that the winding drum 16 rotates in the direction of winding the lifting cord 14. It is configured to always urge with a constant load. That is, the cord winding biasing member 17 is a constant load spring.

  In this embodiment, the urging force (elastic force) of the cord winding urging member 17 is not so great as to raise the bottom rail 13 against the dead weight of the shielding material 12 and the bottom rail 13. Although it is so small that the bottom rail 13 is lowered by its own weight, the bottom rail 13 is set within a range in which the bottom rail 13 can be prevented from being lowered by the torque generated by the torque generator 21. In other words, when the bottom rail 13 cannot be raised by the urging force of the cord winding urging member 17 and the bottom rail 13 can be lowered against the urging force of the cord winding urging member 17, the torque The generator 21 is configured to prevent the lifting / lowering cord 14 from being fed out of the winding drum 16 due to the weight of the shielding member 12 and the bottom rail 13. In this embodiment, two lifting cords 14 are provided, and two cases 22, winding drums 16 and cord winding biasing members 17 are provided. In this embodiment, two lifting cords are provided and two cases, winding drums and cord winding biasing members are provided. However, three or more lifting cords are provided, and the case, winding drum and cords are provided. Three or more winding urging members may be provided.

  The clutch portion 19 is fitted in the center of the center rod 18 (FIGS. 1 and 2). Specifically, a single holder 23 is attached to the head rail 11 so as to be positioned between the two cases 22, 22, and a hollow intermediate shaft 24 is rotatably attached to the holder 23. The clutch portion 19 is fitted into the intermediate shaft 24 so as not to be relatively rotatable, and the center rod 18 is inserted so as not to be relatively rotatable. As shown in detail in FIGS. 3, 5, and 6, the clutch portion includes an outer ring 26 that can be inserted through the intermediate shaft 24, a plurality of cylindrical rollers 27 that are in contact with the outer peripheral surface of the intermediate shaft 24, and a plurality of rollers. 27 holds the assembly state of the outer ring 26, the roller 27, and the leaf spring 29, the roller housing space 28 that accommodates the outer ring 26 in the outer ring 26, the leaf spring 29 formed by integrally molding a thin metal spring material. And a disk-shaped shield plate 31 (FIGS. 3 and 6). The roller accommodating space 28 includes a floor 28a, an upper surface opening 28b, a gradually narrowing side wall surface 28c, a gradually widening side wall surface 28d, a back wall surface 28e, and a side surface opening 28f (FIGS. 5 and 6). ). The side opening 28 f is formed with a height slightly larger than the height of the roller 27 and with a width slightly smaller than the diameter of the roller 27. Further, the leaf spring 29 includes a large circumferential portion 29 a that contacts the edge of the outer ring 26, a disk portion 29 b that is formed in a disk shape, a spring base portion 29 c that contacts the back wall surface 28 e of each roller accommodating space 28, The pressing portion 29d is pressed against the central outer peripheral surface and presses the roller 27 against the narrow side wall surface 28c. When the intermediate shaft 24 rotates in the direction in which the roller 27 approaches the gradually widened side wall surface 28d, the intermediate shaft 24 and the outer ring 26 enter the idle rotation mode, and the intermediate shaft 24 rotates in the direction in which the roller 27 gradually approaches the narrow side wall surface 28c. When this is done, the intermediate shaft 24 and the outer ring 26 are in the torque transmission mode. That is, when the center rod 18 and the intermediate shaft 24 rotate in the direction in which the lifting / lowering cord 14 is wound, the clutch portion 19 can rotate relative to the intermediate shaft 24 of the outer ring 26 and the center in the direction in which the lifting / lowering cord 14 is fed out. When the rod 18 and the intermediate shaft 24 rotate, the outer ring 26 is configured to be unable to rotate relative to the intermediate shaft 24.

  On the other hand, the torque generating device 21 is loosely fitted to the center rod 18, that is, loosely fitted to the intermediate shaft 24 through which the center rod 18 is inserted so as not to be relatively rotatable (FIGS. 3, 4, and 7). The torque generator 21 is connected in a state adjacent to the clutch part 19. Specifically, as shown in detail in FIGS. 3 and 4, the torque generator 21 is inserted into the outer ring portion 32 fixed to the head rail 11, the outer ring portion 32 so as to be relatively rotatable, and the clutch portion 19. The inner ring portion 33 is connected to the inner ring portion 33 and the outer ring portion 32 is interposed between the inner ring portion 33 and the outer ring portion 32 to generate a predetermined torque. The torque generator 34 is a torsion coil spring in this embodiment. Further, the outer diameter of the outer ring portion 32 is formed substantially the same as the outer diameter of the outer ring 26 of the clutch portion 19, and the inner diameter of the outer ring portion 32 is formed slightly larger than the outer diameter of the torsion coil spring 34. Further, a pair of locking pieces 32a and 32a project from the surface of the outer ring portion 32 opposite to the clutch portion 19, and the holder 23 has either one of these locking pieces 32a or 32a sandwiched between the outer ring and the outer ring. A pair of locked pieces 23a that prevent the rotation of the portion 32 are provided in a protruding manner (FIGS. 3 and 7).

  By inserting the inner ring portion 33 into the outer ring portion 32, a spring accommodating space 36 that can accommodate the torsion coil spring 34 is formed between the inner ring portion 32 and the outer ring portion 33 (FIGS. 3 and 4). The inner ring portion 33 is loosely fitted to the intermediate shaft 24, that is, is configured to be rotatable relative to the intermediate shaft 24. The outer diameter of the inner ring portion 33 is formed smaller than the outer diameter of the outer ring portion 32 and slightly larger than the inner diameter of the torsion coil spring 34 in a state where no torsional load is applied. Thereby, when the torsion coil spring 34 is fitted into the outer peripheral surface of the inner ring portion 33, the torsion coil spring 34 applies an appropriate tightening force to the outer peripheral surface of the inner ring portion 33. Further, a cylindrical portion 33a having the same inner diameter as that of the inner ring portion 33 and having a smaller outer diameter than the inner ring portion 33 is provided on the opposite surface of the inner ring portion 33 to the surface of the clutch portion 19. Is formed with a pair of slits 33b, 33b extending in the longitudinal direction of the intermediate shaft 24 (FIG. 3). Further, a ring-shaped concave portion 26a into which the cylindrical portion 33a can be inserted is formed on a surface of the outer ring 26 of the clutch portion 19 facing the torque generating device 21, and the pair of the pair of the inner circumferential surfaces of the concave portion 26a. A pair of ribs 26b, 26b that can be inserted into the slits 33b, 33b are provided in a projecting manner. By inserting the pair of ribs 26 b and 26 b of the outer ring 26 into the pair of slits 33 b and 33 b of the inner ring part 33, the inner ring part 33 of the torque generator 21 is connected to the outer ring 26 of the clutch part 19.

  A pair of hooks 34 a and 34 b are formed at both ends of the torsion coil spring 34 by bending both ends of the torsion coil spring 34 outward in the radial direction of the spring 34, and these hooks 34 a and 34 b are connected to the outer ring portion 32. It is latched by a pair of latched portions 32b and 32c formed on the inner peripheral surface (FIG. 4). Further, a torsion coil spring 34 is fitted on the outer peripheral surface of the inner ring portion 33, and the spring accommodating space 36 is filled with a lubricant such as grease in a state where the inner ring portion 33 is inserted into the outer ring portion 32 (FIGS. 3 and 4). ). This lubricant is charged to keep the slip between the inner ring portion 33 and the torsion coil spring 34 substantially constant, that is, to keep the torque between the outer ring portion 32 and the inner ring portion 33 at a predetermined value. In this embodiment, the torque between the outer ring portion 32 and the inner ring portion 33 is urged by the cord winding biasing member 17 with a constant load so that the winding drum 16 rotates in the direction in which the lifting cord 14 is wound. In this state, the lifting / lowering cord 14 is set to a value that prevents the lifting / lowering cord 14 from being fed out of the winding drum 16 by the dead weight of the shielding member 12 and the bottom rail 13. A closing member 37 is inserted into the opening 32d of the surface of the outer ring portion 32 facing the clutch portion 19 (FIG. 3). Further, an operation lever 38 for raising and lowering the shielding member 12 is provided at the center of the bottom rail 13 (FIGS. 1 and 8). The operation lever 38 includes a holding portion 38 a that holds the bottom rail 13 from below, and a holding portion 38 b that protrudes from the holding portion 38 a toward the room and is held by the operator in order to move the shielding material 12 up and down. Since the shield 12 can be lifted and lowered simply by gripping the grip portion 38b of the operation lever 38 and operating it in the vertical direction, the shield 12 can be quickly lifted and lowered.

  The operation of the lifting / lowering device for the shielding material configured as described above will be described. The clutch portion 19 can rotate relative to the intermediate shaft 24 of the outer ring 26 when the center rod 18 and the intermediate shaft 24 rotate in the direction in which the roller 27 approaches the side wall surface 28d gradually, that is, in the direction in which the lifting / lowering cord 14 is wound up. Thus, when the center rod 18 and the intermediate shaft 24 rotate in the direction in which the roller 27 gradually approaches the narrow side wall surface 28c, that is, the direction in which the lifting / lowering cord 14 is fed, the outer ring 26 cannot be rotated relative to the intermediate shaft 24. Thereby, the clutch part 19 enables relative rotation with the center rod 18 in the direction in which the lifting / lowering cord 14 is wound, and disables relative rotation with the center rod 18 in the direction in which the lifting / lowering cord 14 is fed out. Further, the urging force (elastic force) of the cord winding urging member 17 is not so large as to raise the bottom rail 13 against the own weight of the shielding material 12 and the bottom rail 13, and is caused by the own weight of the shielding material 12 and the bottom rail 13. Although the bottom rail 13 is so small that the bottom rail 13 is lowered, the bottom rail 13 is set within a range in which the bottom rail 13 can be prevented from being lowered by the torque generated by the torque generator 21. In the state where the bottom rail 13 can be lowered against the urging force of the cord winding urging member 17, the torque generating device 21 is moved up and down by the weight of the shielding member 12 and the bottom rail 13. 14 can be prevented from being fed out of the winding drum 16. As a result, the torque generated by the torque generator 21 acts on the center rod 18 that rotates in conjunction with the rotation of the winding drum 16 that winds and unwinds the lifting / lowering cord 14 via the clutch portion 19. A load torque is not generated for the rotation of the center rod 18 in the direction in which the shielding material 12 is folded up, and a load torque is generated for the rotation in the direction in which the shielding material 12 is deployed. Lowering due to the weight of the bottom rail 13 can be prevented. As a result, the bottom rail 13 can be prevented from descending unintentionally. That is, when the raising / lowering operation of the shielding member 12 is not performed, the bottom rail 13 is fixed at that position regardless of the position, and does not move up and down unintentionally.

  In addition, since it is not necessary to set the urging force of the cord winding urging member 17 and the weight of the weight in the bottom rail 13, it is possible to manufacture the device relatively easily. When operating the operation lever 38 to raise the bottom rail 13, it is necessary to resist the weight of the shielding member 12 and the bottom rail 13, but it is supported by the urging force of the cord winding urging member 17, The bottom rail 13 can be raised with a relatively small operating force. Further, when the operation lever 38 is operated to lower the bottom rail, it is necessary to resist the urging force of the cord winding urging member 17 and the torque generated by the torque generator 21, but the shielding material 12 and the bottom rail 13. Therefore, the bottom rail 13 can be lowered with a relatively small operating force.

<Second Embodiment>
9 to 11 show a second embodiment of the present invention. 9 to 11, the same reference numerals as those in FIGS. 1 to 5 denote the same components. In this embodiment, the inner ring portion 73 of the torque generator 61 is fitted and connected to the clutch portion 59 (FIGS. 10 and 11). That is, the inner ring portion 73 of the torque generator 61 also serves as the outer ring 66 of the clutch portion 59. The clutch portion 59 is fitted into the center of the center rod 18 as in the first embodiment. That is, a holder 63 is attached to the head rail 11 so as to be positioned between the two cases 22, 22, a hollow intermediate shaft 64 is rotatably attached to the holder 63, and a clutch portion is further attached to the intermediate shaft 64. 59 is inserted so as not to be relatively rotatable, and the center rod 18 is inserted so as not to be relatively rotatable. The clutch portion 59 includes an outer ring 66 through which the intermediate shaft 64 can be inserted, a plurality of cylindrical rollers 67 in contact with the outer peripheral surface of the intermediate shaft 64, and a roller storage space for storing the plurality of rollers 67 in the outer ring 66. 68, a plate spring 69 formed by integrally molding a thin metal spring material, and a disk-shaped shield plate 71 (FIG. 10) for maintaining the assembled state of the outer ring 66, the roller 67 and the plate spring 69. Have

  On the other hand, the torque generating device 61 is connected to the clutch portion 59 by inserting the outer ring portion 72 fixed to the head rail 11 and the outer ring portion 72 so as to be relatively rotatable and also serving as the outer ring 66 of the clutch portion 59. It has an inner ring portion 73 and a torque generating portion 74 that is interposed between the inner ring portion 73 and the outer ring portion 72 and generates a predetermined torque. The outer ring portion 72 sandwiches either one of a pair of locking pieces 72 a and 72 a protruding from the outer ring portion 72 with a pair of locked pieces 63 a protruding from the holder 63, thereby holding the holder 63 in the holder 63. Fixed. Thereby, rotation of the outer ring part 72 is prevented. Also, by bending both ends of the torsion coil spring 74 outward in the radial direction of the spring 74, a pair of hooks 74a and 74b are formed at both ends of the torsion coil spring 74, respectively. Are respectively locked by a pair of locked portions 72b and 72c formed on the inner peripheral surface. Further, a torsion coil spring 74 is fitted on the outer peripheral surface of the inner ring portion 73, and the spring accommodating space 76 is filled with a lubricant such as grease in a state where the inner ring portion 73 is inserted into the outer ring portion 72. The closing member 77 is inserted into the opening 72 d on the surface facing the portion 59. The configuration other than the above is the same as that of the first embodiment.

  In the lifting / lowering device for the shielding material configured as described above, since the inner ring portion 73 of the torque generating device 61 is connected to the clutch portion 59 in a state of being fitted into the clutch portion 59, the clutch portion 59 and the torque generating device 61 Although the overall outer diameter is larger than that of the first embodiment, the total length thereof can be made shorter than that of the first embodiment. As a result, the sizes of the clutch portion 59 and the torque generator 61 in the longitudinal direction can be made compact. Since operations other than those described above are substantially the same as those in the first embodiment, repeated description will be omitted.

  In the first and second embodiments described above, the clutch portion enables relative rotation with the center rod in the direction of winding the lifting / lowering cord and disables relative rotation with the center rod in the direction of feeding the lifting / lowering cord. When the bottom rail cannot be raised by the urging force of the cord winding urging member and the bottom rail can be lowered against the urging force of the cord winding urging member, the torque generating device Although it was configured to prevent the lifting / lowering cord from being unwound from the take-up drum due to the weight of the shielding material and the bottom rail, the clutch portion disables relative rotation with the center rod in the direction of winding the lifting / lowering cord and lifts / lowers. The bottom rail can be raised by the urging force of the cord winding urging member while allowing relative rotation with the center rod in the direction in which the cord is fed out. When the bottom rail cannot be lowered against the urging force of the mounting urging member, the torque generator prevents the lifting / lowering cord from being wound around the winding drum against the weight of the shielding member and the bottom rail. You may comprise as follows. In this case, the weight of the shielding member and the bottom rail is not so great that the bottom rail is lowered against the urging force of the cord winding urging member, and the bottom rail is raised by the urging force of the cord winding urging member. Although it is so large, it is set within a range in which the bottom rail can be prevented from rising by the torque generated by the torque generator. As a result, the weight in the bottom rail can be eliminated or the weight of the weight can be reduced, so that the lifting cord is not intended and the weight of the shielding material and the bottom rail is unintentionally without increasing the operation of raising the shielding material. Can be prevented from being wound around the winding drum.

  Further, in the first and second embodiments, the shielding material is expanded when the folding angle of the shielding element piece at the fold is increased and the bending angle of the shielding element piece at the fold is reduced. The screen lifting / lowering device of the present invention is applied to the screen, but the space between the roman shade where the shielding material is flattened and folded up like a bellows, and the plurality of slats (shielding materials) extending in the horizontal direction is widened. Even if the elevating device for a shielding material according to the present invention is applied to a solar radiation shielding device such as a horizontal blind that is expanded and the interval between a plurality of slats (shielding materials) is narrowed, or a vertical folding partition door Good. When the lifting / lowering device for a shielding material according to the present invention is applied to a horizontal blind, the bottom rail extends horizontally below the shielding material (lowermost slat).

  In the first and second embodiments, the torque generating unit that generates a predetermined torque between the inner ring portion and the outer ring portion is configured by a torsion coil spring. However, the torque generating unit is configured by an electromagnet, an oil damper, or the like. It may be configured. Specifically, when the torque generating part is constituted by an electromagnet, a permanent magnet is attached to the outer peripheral surface of the inner ring part, and a magnetic core part is provided on the inner peripheral surface of the outer ring part so as to face the permanent magnet with a gap therebetween. A magnetic force is generated in the magnetic core portion by winding a coil and passing an electric current through the coil, and a predetermined force is generated between the inner ring portion and the outer ring portion by an attractive force between the magnetic force generated in the magnetic core portion and the magnetic force of the permanent magnet. Torque can be generated. This torque can be adjusted by changing the voltage or current flowing through the coil. Also, when the torque generator is configured with an oil damper, viscous oil is sealed between the outer ring part and the inner ring part, and when the inner ring part rotates in one direction with respect to the outer ring part, the oil is agitated and has a large resistance. However, when rotating in the other direction, a plurality of blades that hardly agitate the oil and have only a small resistance are attached to the outer ring portion or the inner ring portion. This torque can be adjusted by changing the viscosity of the oil and the mounting angle of the blades.

  In the first and second embodiments, the operation lever for raising and lowering the shielding material is provided on the bottom rail. However, a pulley is fitted to the center rod, and the shielding material is elevated and lowered on this pulley. An operation chain may be hung. Furthermore, in the first and second embodiments, the operation lever for raising and lowering the shielding material is provided on the bottom rail. However, an operation for fitting the pulley to the center rod and raising and lowering the shielding material is performed. The chain may be stretched around this pulley. In this case, since the shield can be raised and lowered by operating the operation chain, the shield can be folded up to the vicinity of the upper end without reaching the upper end of the shield.

DESCRIPTION OF SYMBOLS 11 Head rail 12 Shielding material 13 Bottom rail 14 Lifting cord 16 Winding drum 17 Cord winding urging member 18 Center rod 19, 59 Clutch portion 21, 61 Torque generator 32, 72 Outer ring portion 33, 73 Inner ring portion 34, 74 Torsion coil spring (torque generator)
38 Control lever

Claims (6)

A head rail; a shielding member that is suspended from the head rail and can be unfolded; a bottom rail that extends in a horizontal direction at a lower end or below the shielding member; and a lift that has a lower end coupled to the bottom rail. In a lifting / lowering device for a shielding material, including a cord and a winding drum that is rotatably provided in the head rail and winds the lifting / lowering cord so as to be fed out.
A cord winding biasing member that biases the winding drum to rotate in a direction in which the lifting cord is wound;
A center rod rotatably mounted in the head rail and fitted with the take-up drum in a relatively non-rotatable manner;
A clutch portion that is fitted into the center rod and enables or disables relative rotation with the center rod in the direction of winding the lifting / lowering cord and disables or enables relative rotation with the center rod in the direction of feeding the lifting / lowering cord. When,
An outer ring portion fixed to the head rail, an inner ring portion inserted into the outer ring portion so as to be relatively rotatable and connected to the clutch portion, and interposed between the inner ring portion and the outer ring portion, and generate a predetermined torque. A torque generator having a torque generator,
When the bottom rail cannot be raised by the urging force of the cord winding urging member and the bottom rail can be lowered against the urging force of the cord winding urging member, the torque generating device is The lifting cord is prevented from being unwound from the winding drum by the dead weight of the shielding material and the bottom rail, the bottom rail can be raised by the biasing force of the cord winding biasing member, and When the bottom rail cannot be lowered against the urging force of the cord winding urging member, the torque generating device causes the lifting cord to be wound around the winding drum by the urging force of the cord winding urging member. A lifting and lowering device for a shielding material, characterized in that it is configured to prevent it from being taken.   2. The lifting / lowering device for a shielding material according to claim 1, wherein an inner ring portion of the torque generating device is connected to the clutch portion while being loosely fitted to the center rod.   The lifting / lowering device for a shielding material according to claim 1, wherein an inner ring portion of the torque generating device is coupled to the clutch portion in a state of being fitted into the clutch portion.   2. The lifting / lowering device for a shielding material according to claim 1, wherein the cord winding urging member is a spiral spring.   The raising / lowering apparatus of the shielding material of Claim 1 with which the operation lever was provided in the said bottom rail.   The lifting / lowering device for a shielding member according to claim 2 or 3, wherein a pulley is fitted to the center rod, and an operation chain is stretched over the pulley.

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