JP2015057533A - Operation cord, and shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar shielding device improved in safety, and to provide an operation cord used for opening/closing a shielding member of the solar shielding device.SOLUTION: An operation cord of the invention is an operation cord which is wound around an operation pulley and is used for opening/closing a shielding member by rotating the operation pulley, and the operation cord has at least two connection parts each of which is separated when a separation force of a magnitude exceeding a holding force is applied. The connection part is configured so that the holding force is changed depending on a direction to which the connection part is directed. The connection parts are arranged so that at least one of the connection parts is under a low holding force state in a case that at least the another of the connection parts is under a high holding force state, in a state that the cord is wound around the operation pulley.

Description

  The present invention relates to a shielding device such as a horizontal blind, a raising curtain, a pleated screen, and a roll screen, and an operation cord used for opening and closing a shielding material of the shielding device.

  In the solar radiation shielding device, an endless operation cord is hung on an operation pulley rotatably supported at one end of the head box, and the operation pulley is operated to rotate the operation pulley, thereby shielding the solar radiation. There are things that raise and lower the material. When such an endless operation cord is suspended from the operation pulley, the endless edge of the operation cord may be caught by a resident moving in the room or other moving objects.

  Therefore, the endless operation cord has a fail-safe function that ensures the safety of the occupant by being separated by the tensile force when an excessive tensile force that exceeds the tensile force that acts during normal operation is applied. Some are provided with a connection part (patent documents 1 and 2).

  In Patent Document 1, when the connecting portion is engaged with the operation pulley, in order to solve the problem that the connecting portion may not be properly separated even if a large force is applied to the operation cord, Two connecting portions are provided with an interval longer than the length to be engaged. With such a configuration, since at least one of the two connecting portions is not engaged with the operation pulley, the above problem is solved.

  In Patent Document 2, in a connecting member for connecting both ends of an operation cord, a stopper that can move up and down is provided in the connecting member, and the holding force is changed depending on the direction of the connecting member. Such a configuration provides a safety mechanism that is difficult to separate when the shielding member is raised and lowered, and that is easy to separate when the shielding member is stopped at the raised position.

JP 2011-6929 A Japanese Patent No. 4832180

Even in Patent Documents 1 and 2, safety is ensured at a high level. However, when the inventor studied to further increase safety, the following points were noticed.
In Patent Document 1, although two connecting portions are provided, the holding force of each connecting portion needs to be large enough not to come off during the elevating operation of the solar radiation shielding material. When it is adopted, there is a possibility that the operation cord is not separated at the connecting portion when it is caught by the operation cord with a light force. Further, in Patent Document 2, it is assumed that the operation cord is caught by a light force with a strong holding force of the connection member, and in this case, the operation code may not be separated at the connection portion.

  As described above, in the prior art, safety is ensured at a high level, but there is room for further improvement.

  This invention is made | formed in view of such a situation, and provides the operation code used in order to open and close the shielding apparatus with which safety | security was improved, and the shielding material of a shielding apparatus.

  According to the present invention, the operation cord is used to open and close the shielding member by being rotated on the operation pulley and opening and closing the shielding material, and the operation cord has a separation force exceeding a holding force. At least two connecting portions that are separated when added, the connecting portion is configured such that the holding force changes according to the direction in which the connecting portion is directed, and the connecting portion is hooked on the operation pulley. An operation cord is provided in which, when at least one of the connecting portions is in a high holding force state, another at least one of the connecting portions is in a low holding force state. .

  In many shielding devices, the maximum tension applied to one of the two portions of the operation cord suspended from the operation pulley is greater than the maximum tension applied to the other (the portion with the larger maximum tension is the high tension portion). The part with the smaller maximum tension is the low tension part.) The inventor uses this difference in maximum tension to configure the connecting portion so that the holding force of the connecting portion changes depending on the direction in which the connecting portion is directed, and when the connecting portion is located in the high tension portion. The present inventors have come up with the idea that a high holding force state is set and a low holding force state is set when the connecting portion is located in a low tension portion. Further, the operation cord is provided with at least two connecting portions, and when at least one of these connecting portions is in a high holding force state, the connecting portion is arranged so that at least one of them is in a low holding force state. By doing so, it has been devised that there is always a connecting part in a low holding force state. According to such a configuration, the connecting portion in the low holding force state is not separated during normal operation, but is easily separated when a relatively small force is applied from the outside. Even in the case of a failure, the connecting portion is surely separated and the safety is improved.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the operation cord includes n (n is 3 or more) connecting portions, and the n connecting portions have a distance between two closest connecting portions from a half of the outer periphery of the operating pulley. Is also arranged to be separated.
Preferably, the connecting portion includes a moving member that can move in accordance with a change in a direction in which the connecting portion is directed, and the holding force is changed in accordance with the movement of the moving member.
Preferably, the engaging portion of the connecting portion is configured to be disengaged by spreading outward in the radial direction of the operation cord, and the moving member is configured to be engaged with the engaging portion from an outer peripheral side of the engaging portion. The holding force of the connecting portion is changed by restricting / non-regulating deformation in the direction in which the joint portion spreads.

According to the present invention, there is also provided a shielding device that opens and closes a shielding material by rotating the operation pulley by operation of an operation cord mounted on the operation pulley, wherein the operation code is the operation code. An apparatus is provided.
Preferably, the maximum tension applied to one of the two portions of the operation cord suspended from the operation pulley is greater than the maximum tension applied to the other, and the portion with the larger maximum tension is a high tension portion, The portion with the smaller maximum tension is set as a low tension portion, and the connecting portion is in a high holding force state when located in the high tension portion, and is held low when located in the low tension portion. It is configured to be in a force state.
Preferably, the holding force of the connecting portion in the high holding force state is larger than the maximum tension applied to the high tension portion, and the holding force of the connecting portion in the low holding force state is the maximum force applied to the low tension portion. Greater than tension.
Preferably, a one-way clutch that does not transmit the rotation of the operation pulley in the direction in which the shielding material is lowered to a drive shaft for opening and closing the shielding material is provided.
Preferably, the connecting portion includes a moving member that is movable in accordance with a change in a direction in which the connecting portion is directed, and is configured so that a holding force changes as the moving member moves, The movement is configured to be promoted by the movement promoting member.

  According to another aspect of the present invention, there is provided a shielding device that opens and closes a shielding material by rotating the operation pulley by an operation of an operation cord mounted on the operation pulley, and the operation cord is larger than a holding force. A connecting portion that is separated when a separating force is applied, and the connecting portion is configured such that the holding force changes with the movement of the moving member at a position where the operation cord is turned, and the moving member A shielding device is provided that is configured to be facilitated by a movement promoting member. In this case, the number of connecting portions may be one.

It is a front view of the pleat screen of a 1st embodiment of the present invention. It is a right view of the pleat screen of FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 2 is an exploded perspective view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. It is sectional drawing which shows the structure of a stopper apparatus. It is an expanded view which shows the stopper guide groove of a stopper apparatus. The ball chain 13 of 1st Embodiment of this invention is shown, (a) shows the state which main cords 13a and 13b and connection parts 17a and 17b are isolate | separated, (b) shows the state which these were connected. (A)-(b) is an enlarged view of the area | regions X and Y of Fig.10 (a), respectively. It is a perspective view of the connection part 17a of Fig.11 (a). It is a front view of the 1st connection member 41a. It is a top view of the 1st connection member 41a. It is a side view of the 1st connection member 41a. It is CC sectional drawing of FIG. FIG. 6 is a front view of a second connecting member 42. FIG. 6 is a rear view of the second connecting member 42. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is sectional drawing which shows the fitting state of the 1st connection member 41a and the 2nd connection member 42. FIG. (A)-(b) is a figure corresponding to Drawing 11, and shows the state where connecting part 17a is in a low holding power state, and connecting part 17b is in a high holding power state. A state in which the ball chain 13 is rotated by half a circle from the state of FIG. 2 and the bottom rail 5 is raised is shown. The connection parts 17a and 17b of the ball chain 13 of 2nd Embodiment of this invention are shown. The operation cord 14 of 3rd Embodiment of this invention is shown, (a) shows the state with which main code 14a, 14b and connection part 17a, 17b are isolate | separated, (b) shows the state with which these were connected. (A)-(b) is an enlarged view of the area | regions X and Y of FIG.26 (b), respectively. The ball chain 13 of 4th Embodiment of this invention is shown, (a) shows the state with which main cords 13a and 13b and connection part 17a, 17b were isolate | separated, (b) shows the state with which these were connected. It is a perspective view which shows the connection structure of main cord 13a, 13b and connection part 17a, 17b. (A) shows the state where the connecting portion 17b in the low holding force state is fitted to the operation pulley 11, and (b) shows the ball chain according to the fifth embodiment of the present invention, in which the number of connecting portions is three. 13 shows a state in which the ball chain 13 of (b) is hung on the operation pulley 11. The modification of the ball chain 13 of 5th Embodiment of this invention is shown. It is a figure corresponding to FIG. 2 for demonstrating the operating method of the solar radiation shielding apparatus of 6th Embodiment of this invention. It is a perspective view of the connection part 17a of the ball chain 13 of 8th Embodiment of this invention. The state in which the ball chain 13 of the ninth embodiment of the present invention is hooked on the operation pulley 11 is shown, (a) is the connecting portion 17a in the low holding force state, (b) is the connecting portion 17a in the high holding force state. It shows the state that is. The state in which the ball chain 13 of the ninth embodiment of the present invention is hooked on the lower pulley 64 is shown, (a) is a state in which the connecting portion 17a is in a high holding force state, (b) is a state in which the connecting portion 17a is in a low holding force state. It shows the state that is. The member which comprises the connection part 17a of the operation cord 14 of 10th Embodiment of this invention is shown, (a) is a disassembled sectional view, (b) is a disassembled perspective view of the holding force switching unit 100. The connection part 17a of the operation cord 14 of 10th Embodiment of this invention is shown, (a) shows the state in which the connection part 17a is in a high holding force state, (b) shows the state in which the connection part 17a is in a low holding force state. . The connection part 17a of the ball chain 13 of 11th Embodiment of this invention is shown, (a) shows the state in which the connection part 17a is in a high holding force state, (b) shows the state in which the connection part 17a is in a low holding force state. . In 11th Embodiment of this invention, the state by which the movement of the moving member 40 is accelerated | stimulated by the mode switching pulley 66 is shown, (a) is the connection part 17a in a low holding force state, (b) is the connection part 17a holding high. Indicates the state that is in the force state. In 11th Embodiment of this invention, the state by which the movement of the moving member 40 is accelerated | stimulated by the tapered surface 64d provided in the lower pulley 64 is shown.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other. The invention is established independently for each feature. In the following description, “ball chain” can be appropriately read as “operation code”, and the pleat screen can be appropriately read as “sunlight shielding device”.

1. First Embodiment A pleated screen according to a first embodiment of the present invention shown in FIGS. 1 to 2 has a screen 4 suspended from a head box 1 and a bottom rail 5 attached to the lower end of the screen 4. The screen 4 enables the fabric to be folded in a zigzag shape.

  Between the head box 1 and the bottom rail 5, a pitch holding cord 39 for holding the pitch of the folds of the screen 4 is provided. The pitch holding cord 39 is provided with a large number of annular holding portions 57 at equal intervals. After the holding portions 57 are inserted into the screen 4, the lifting cord 7 for raising and lowering the bottom rail 5 is held by the holding portion 57. The holding portion 57 is prevented from coming off from the screen 4 by being inserted into the screen 4, thereby enabling the pitch of the screen 4 to be held. The pitch holding cord 39 and the lifting / lowering cord 7 are arranged on opposite sides of the screen 4.

  A pitch holding cord holding member 56 that holds the pitch holding cord 39 and a lifting / lowering cord holding member 55 that holds the lifting / lowering cord 7 are attached to the bottom rail 5. The pitch holding cord 39 and the lifting / lowering cord 7 are attached to the bottom rail 5 by these holding members.

  The upper end of the lifting / lowering cord 7 is attached to the winding shaft 10. The winding shaft 10 rotates together with the drive shaft 12. At one end of the head box 1, an operation unit unit 23 including a ball chain 13, an operation pulley 11, and a transmission clutch 21 is provided. The ball chain 13 is hooked on the operation pulley 11, and the rotational force in the pulling direction of the bottom rail 5 (direction of arrow A in FIG. 1) applied to the operation pulley 11 by the ball chain 13 is transmitted via the transmission clutch 21. It is transmitted to the drive shaft 12. The transmission clutch 21 is configured to transmit the rotational force in the direction of arrow A in FIG. 1 but not to transmit the rotational force in the direction of arrow B in FIG.

  Here, an example of a specific mechanism (one-way cooker) in which the transmission clutch 21 transmits only rotation in one direction will be described with reference to FIGS. The mechanism shown below is an example, and the transmission clutch 21 may have another mechanism as long as it has a similar function.

  The shaft 71 is supported so as not to rotate with respect to the head box 1. The drive drum 72 is supported so as to be rotatable with respect to the shaft 71 and immovable in the axial direction. The rotational force applied to the operation pulley 11 is transmitted to the drive drum 72 via a drive gear (not shown) that rotates integrally with the operation pulley 11 and a transmission gear 89 that meshes with the drive gear.

  Adjacent to the drive drum 72, a clutch drum 73 is supported so as to be rotatable with respect to the shaft 71 and movable in the axial direction. As shown in FIG. 5, the clutch drum 73 has a guide groove 74 formed on the outer peripheral surface thereof, and the guide groove 74 is formed by offsetting an engagement groove 75 and a release groove 76 in the axial direction.

  A slip spring 77 is disposed between the drive drum 72 and the clutch drum 73. The clutch drum 73 is urged in the direction away from the drive drum 72, that is, in the direction of arrow E shown in FIG. 3, by the urging force of the slip spring 77 with the drive drum 72 as a fulcrum.

  A collar 78 is non-rotatably fitted to the shaft 71 adjacent to the clutch drum 73, and a stop spring 79 is wound around the outer peripheral surface of the collar 78. As shown in FIG. 4, both end portions 80a and 80b of the stop spring 79 are bent in the radial direction, and an engaging portion 73a of the clutch drum 73 protrudes between the both end portions 80a and 80b.

  When the engaging portion 73a comes into contact with one of the end portions 80a and 80b of the stop spring 79, the friction between the stop spring 79 and the collar 78 increases, and the rotation of the clutch drum 73 is prevented. ing.

  A rotary drum 81 is supported around the clutch drum 73 so as to be rotatable and movable in the axial direction. The rotating drum 81 is formed with an engaging recess 82 that opens to the drive drum 72 side, and the engaging recess 82 is engaged with an engaging protrusion 83 formed on the drive drum 72. Accordingly, the rotating drum 81 is rotated integrally with the driving drum 72.

  A hemispherical clutch convex portion 84 that engages with the guide groove 74 of the clutch drum 73 is formed on the inner peripheral surface of the rotary drum 81. When the rotating drum 81 rotates, the clutch convex portion 84 is guided by the guide groove 74, and the rotating drum 81 moves in the axial direction.

  On the inner peripheral surface of the rotating drum 81, an engaging portion 85 that contacts the end portions 80a and 80b of the stop spring 79 is formed. When the engaging portion 85 is engaged with one of the end portions 80a and 80b, the friction between the stop spring 79 and the collar 78 is reduced, and the stop spring 79 and the clutch drum 73 are rotated together with the rotary drum 81. The

  A transmission drum 86 is supported at the tip of the shaft 71 so as to be rotatable and immovable in the axial direction. A pair of sawtooth driven locking teeth 87 are formed on the end surface on the base end side of the transmission drum 86, that is, on the end surface facing the rotating drum 81.

  A pair of sawtooth drive locking teeth 88 are formed on the end surface of the rotating drum 81, that is, on the end surface facing the transmission drum 86. Then, when the rotary drum 81 is rotated and moved to the transmission drum 86 side, the drive locking teeth 88 are engaged with the driven locking teeth 87, and the rotary drum 81 and the transmission drum 86 are rotated together. Further, concave portions (four in this example) are provided on the winding shaft side in the axial direction of the transmission drum 86 and are fitted to the output shaft 21a. The output shaft 21a is fitted to the drive shaft 12, and the rotation of the transmission drum 86 is transmitted to the drive shaft 12 through the output shaft 21a.

  As shown in FIGS. 6 and 7, when the rotary drum 81 moves to the drive drum 72 side, the engagement between the drive locking teeth 88 and the driven locking teeth 87 is released, and the transmission drum 86 can be freely moved. It can be rotated. The transmission drum 86 is coupled to rotate integrally with the drive shaft 12.

Next, the operation of the transmission clutch 21 will be described.
When the operation pulley 11 is rotated in the pulling direction of the bottom rail 5, the rotational force is transmitted to the rotary drum 81 via a drive gear (not shown), a transmission gear 89, and the drive drum 72.

  Then, the clutch convex portion 84 is guided into the engagement groove 75, the rotary drum 81 moves toward the transmission drum 86, and the driving locking teeth 88 engage with the driven locking teeth 87. Then, the rotation of the drive drum 72 is transmitted to the transmission drum 86 via the rotary drum 81, and the drive shaft 12 is rotated based on the rotation of the transmission drum 86 in the direction of arrow A in FIG. At this time, after the drive locking teeth 88 are engaged with the driven locking teeth 87, the engaging portion of the rotary drum 81 contacts the end 80a of the stop spring 79, so that the clutch drum 73 and the stop spring 79 are driven. It is rotated integrally with the drum 72.

  On the other hand, when the operation pulley 11 is rotated in the pulling-down direction of the bottom rail 5, the rotational force in the direction of arrow B in FIG. 5 is transmitted to the rotating drum 81, and the clutch protrusion 84 moves to the release groove 76. The engagement of the locking teeth 88 and the driven locking teeth 87 is released, the driving locking teeth 88 idle in the direction of arrow B in FIG. 5, and the rotational force in the direction of arrow B in FIG. It is not transmitted to the drive shaft 12.

  With the above configuration, the transmission clutch 21 transmits only the rotation in one direction applied to the operation pulley 11 to the drive shaft 12.

  The drive shaft 12 is inserted through the stopper device 24 at the intermediate portion of the head box 1. When the ball chain 13 is released after the bottom rail 5 is lifted, the stopper device 24 stops the rotation of the drive shaft 12 and prevents the bottom rail 5 from dropping its own weight.

  Here, the operation of the stopper device 24 will be described with reference to FIGS.

  As shown in FIG. 8, the stopper device 24 includes a stopper drum 94, a stopper case 95 disposed around the stopper drum 94, and a stopper ball 96 disposed therebetween. On the outer peripheral surface of the stopper drum 94, there is provided a stopper guide groove 98 having the outer peripheral surface shape shown in FIG. A slide groove 97 extending in the direction along the drive shaft 12 and having a semicircular cross section is provided on the inner peripheral surface of the stopper case 95. The stopper ball 96 is disposed between the stopper guide groove 98 and the slide groove 97. Accordingly, the stopper ball 96 can move only in the direction along the drive shaft 12, and when the stopper drum 94 is rotated, the stopper ball 96 moves on the outer peripheral surface of the stopper drum 94 along the stopper guide groove 98. It moves along the slide groove 97 while circling relatively.

  The structure of the stopper guide groove 98 will be described with reference to a development view shown in FIG. In FIG. 9, when the stopper drum 94 is rotated in the direction in which the bottom rail 5 is pulled up (in the direction of arrow A in FIG. 1), the stopper ball 96 moves relatively on the stopper guide groove 98 in the direction of arrow C in FIG. .

  When the stopper drum 94 is rotated in the direction in which the screen 4 is pulled down (the direction of arrow B in FIG. 1), the stopper ball 96 moves relatively in the direction of arrow D on the stopper guide groove 98.

  A pull-down groove 99 is formed on one side of the outer peripheral surface of the stopper drum 94. A first return groove 50 that branches in the direction of arrow C communicates with the pull-down groove 99, and the first return groove 50 joins the pull-up groove 51 in the direction of arrow C.

  The pulling groove 51 communicates with a stop groove 52 that branches in the direction of arrow D. The stop groove 52 stops at a locking portion 53 in the direction of arrow D, and passes through a second return groove 54 that extends in the direction of arrow C. It joins the pull-down groove 99.

  In the stopper device 24 configured as described above, when the drive shaft 12 is rotated in the pulling direction of the screen 4 via the transmission clutch 21 based on the operation of the ball chain 13, the stopper ball 96 moves in the pulling groove 51. Move in the direction of arrow C.

  When the ball chain 13 is released after the screen 4 is pulled up to a desired position, the lifting / lowering cord 7 is rewound by the weight of the screen 4, the stopper drum 94 is rotated via the drive shaft 12, and the stopper ball 96 is pulled up. It moves in the direction of arrow D in the groove 51.

  Then, the stopper ball 96 engages with the locking portion 53, and further rotation of the stopper drum 94 is prevented. Therefore, in this state, the weight drop of the screen 4 is prevented.

  Next, when the screen 4 is lowered, if the screen 4 is slightly lifted by operating the ball chain 13, the stopper ball 96 passes from the locking portion 53 through the second return groove 54 into the lowering groove 99. Guided.

  Then, since the stopper ball 96 can go around in the pull-down groove 99 in the direction of arrow D, if the ball chain 13 is released, the screen 4 can be lowered by its own weight.

  Further, when the screen 4 is further lifted from the state in which the stopper ball 96 is engaged with the locking portion 53, the ball chain 13 is operated in the pulling direction of the screen 4.

  Then, the stopper ball 96 is guided from the locking portion 53 through the second return groove 54 into the pull-down groove 99, and further guided through the first return groove 50 into the pull-up groove 51. Therefore, the screen 4 can be lifted by the ball chain 13.

  As shown in FIG. 1, the drive shaft 12 is inserted through the governor device 36 on the side of the stopper device 24. The governor device 36 suppresses the rotational speed of the drive shaft 12 to a predetermined value or less without stopping the rotation of the drive shaft 12, and suppresses the descending speed when the weight of the bottom rail 5 is lowered to a predetermined speed or less.

  Here, the operation of the pleated screen will be described. When the interior portion of the ball chain 13 is pulled in the direction of arrow A in FIG. 2, the rotational force generated by the force is transmitted to the transmission clutch 21 via the operation pulley 11. Since the transmission clutch 21 is configured to transmit only the rotational force in the direction of arrow A in FIG. 1 to the drive shaft 12, the rotational force generated by pulling the ball chain 13 in the direction of arrow A in FIG. Is transmitted to the drive shaft 12, and the drive shaft 12 is rotated. By the rotation of the drive shaft 12, the winding shaft 10 rotatably supported by the support member 8 in the head box 1 rotates in the direction of arrow A in FIG. 1, and the lifting / lowering cord 7 is spirally wound, The bottom rail 5 attached to the tip of the lifting / lowering cord 7 rises.

  If the hand is released from the ball chain 13 in this state, the stopper device 24 is activated to prevent the bottom rail 5 from dropping its own weight. In this state, when the ball chain 13 is pulled again in the direction of arrow A in FIG. 2 and then released, the operation for preventing the weight of the stopper device 24 from dropping is released, and the lifting / lowering cord 7 is rewound from the winding shaft 10. The bottom rail 5 is lowered.

  Since the transmission clutch 21 does not transmit the rotational force in the direction of arrow B in FIG. 1, even if the outside portion of the ball chain 13 is pulled down in the direction of arrow B in FIG. 2, the force is transmitted to the drive shaft 12. First, the ball chain 13 is idle. Accordingly, even if the outside of the ball chain 13 is pulled down, little tension is applied to the ball chain 13.

  Next, a specific configuration of the ball chain 13 will be described with reference to FIGS. As shown in FIGS. 10A and 10B, the ball chain 13 is formed of synthetic resin balls 16 on a polyester cord 15 at equal intervals. Each ball 16 is formed by forming a long spherical solid body on the surface of the cord 15 with a molding machine, and each ball 16 is fixed to the cord 15 so as not to move. For convenience of illustration, in FIG. 10, the number of balls 16 is smaller than those in FIGS.

  The ball chain 13 can be formed by connecting two main cords 13a and 13b with two connecting portions 17a and 17b. Each of the main cords 13 a and 13 b includes a large number of balls 16 on the cord 15, and hemispherical portions 16 a are provided at both ends of the cord 15. In the present embodiment, the main cord 13a and the main cord 13b have the same length.

  As shown in FIGS. 10 to 11, the connecting portions 17 a and 17 b have the same configuration, and are connected to the main cords 13 a and 13 b in a state where the connecting portions 17 are vertically inverted. Hereinafter, although description is advanced about the connection part 17a, the same description is applied also to the connection part 17b.

  As shown in FIGS. 11 to 12, the connecting portion 17 a is formed by connecting a first fitting portion 43 provided at one end of two first connecting members 41 a and 41 b to a cylindrical second connecting member (first (Second fitting portion) 42. The basic configuration of the first connecting members 41a and 41b is the same, but the first connecting member 41a is a movement that accommodates the columnar moving member 40 in a round shaft-like fitting projection 45 so as to be slidable. The point which the member accommodating part 29 is provided differs from the 1st connection member 41b. The length of the moving member accommodating portion 29 in the depth direction is longer than the length of the pin-shaped moving member (moving pin) 40 in the height direction (for example, 1.5 times or more, preferably 2 times or more). . As shown in FIG. 11A, when the fitting protrusion 45 of the first connecting member 41a faces downward, the moving member 40 moves to the substantially tip of the fitting protrusion 45 to connect The part is in a high holding force state. On the other hand, as shown in FIG. 11B, when the fitting protrusion 45 of the first connecting member 41 a faces upward, the moving member 40 moves to a position away from the tip of the fitting protrusion 45. And a connection part will be in a low holding power state.

  As shown in FIGS. 11 to 12, the first connecting members 41 a and 41 b have a hemispherical portion 20 that is half the shape of the ball 16 formed on one end of a connecting cord 19 made of the same material as the cord 15, and the other end. The 1st fitting part 43 is formed in. A ball 44 having the same shape as the ball 16 is fixed between the hemispherical portion 20 and the first fitting portion 43, and the interval between the first fitting portion 43 and the ball 44 and the interval between the ball 44 and the hemispherical portion 20. Is the same as the interval between the balls 16.

  The hemispherical portion 20 and the first fitting portion 43 are formed at both ends of the connecting cord 19 with the same synthetic resin as the ball 16. The base end portion of the first fitting portion 43 is formed in a hemispherical shape similar to the end portion of the ball 16, and a round shaft-like fitting protrusion 45 is formed at the distal end portion of the first fitting portion 43. Is formed.

  As shown in FIGS. 12 to 15, an enlarged diameter portion 46 is formed in line symmetry with respect to the center of the round shaft on the outer peripheral surface of the distal end portion of the fitting protrusion 45. Each is formed with a recess 47 having a semicircular cross section.

  As shown in FIGS. 12 and 16, a rotation restricting portion 48 that protrudes in the radial direction of the round shaft is formed in the base end portion of the fitting protrusion 45 so as to be axisymmetric with respect to the center. Each rotation restricting portion 48 is formed at a position 45 degrees away from the recess 47 in the circumferential direction with respect to the center of the round shaft.

  The second connecting member 42 is formed as a second fitting portion that is formed into a cylindrical shape with the same synthetic resin as the first fitting portion 43 and the balls 16 and 44, and has a fitting hole. As shown in FIG. 18, the openings 49 a and 49 b on both sides are formed in a bowl shape that allows insertion of the tip end portion including the enlarged diameter portion 46 of the fitting protrusion 45. In addition, the openings 49a and 49b have shapes in which the direction of the bowl shape is rotated 90 degrees with respect to the center of the cylinder.

  A circular hole 50 having a diameter that allows the distal end portion of the fitting projection 45 to turn is formed inside the second connecting member 42. And the latching | locking part 51a, 51b which prevents the detachment from the circular hole 50 of the enlarged diameter part 46 of the 1st connection member 41a is formed in the opening edge of the short axis direction of the saddle shape of the opening part 49a, respectively. Locking portions 51c and 51d that prevent the expanded portion 46 of the first connecting member 41b from coming out of the circular hole 50 are formed on the opening edge in the short axis direction of the bowl-shaped portion 49b.

  In addition, on the inner side of the locking portions 51a and 51c, protrusions 52 that engage with the recesses 47 are formed on the inner peripheral surface of the circular hole 50, respectively. In order to connect the first connecting member 41a and the second connecting member 42, the fitting protrusion 45 of the first fitting portion 43 of the first connecting member 41a is connected to the opening of the second connecting member 42. It inserts in 49a and rotates the 1st fitting part 43 90 degree | times clockwise with respect to the 2nd connection member 42. As shown in FIG. Then, the recess 47 of the fitting protrusion 45 is engaged with the protrusion 52 in the circular hole 50, and the rotation restricting portion 48 is moved from the bowl-shaped corner of the opening 49a to the adjacent corner, Positioning is performed as shown in FIG.

  Similarly, the fitting protrusion 45 of the first connecting member 41b is inserted into the other opening 49b of the second connecting member 42 and rotated 90 degrees for positioning. Then, as shown in FIG. 11, the first connecting members 41 a and 41 b are connected via the second connecting member 42.

  In this state, the enlarged diameter portion 46 of the fitting protrusion 45 of each of the first connecting members 41 a and 41 b engages with the locking portions 51 a to 51 d of the second connecting member 42, and the second connecting member 42. Is held in the circular hole 50. Further, the outer shape in a state where the first fitting portion 43 is fitted to both sides of the second connecting member 42 is formed to be the same shape as the ball 16. The hemispherical portions 20 of the first connecting members 41a and 41b are welded and fixed to the hemispherical portions 16a that are outsert-molded at both ends of the main cords 13a and 13b, so that a ball having the same shape as the ball 16 is formed. When the first connecting members 41a and 41b are connected by the second connecting member 42, the endless ball chain 13 is formed as shown in FIG. In the ball chain 13 configured as described above, balls of the same shape are formed at the same interval over the entire length of the cord 15 and the connecting cord 19 of the connecting portions 17a and 17b. Therefore, the ball chain 13 can circulate without limitation with respect to the operation pulley 11.

  By the way, in Fig.11 (a), as for the connection part 17a, the fitting protrusion 45 of the 1st connection member 41a faces the lower side, and the moving member 40 is arrange | positioned at the substantially front-end | tip of the fitting protrusion 45. FIG. Therefore, in FIG. 11B, the connecting portion 17b has the fitting protrusion 45 of the first connecting member 41a facing upward and the moving member 40 of the fitting protrusion 45 in FIG. Since it is arrange | positioned in the position away from the front-end | tip, it is a low holding power state. On the other hand, as shown in FIGS. 23A to 23B, the fitting protrusion 45 of the first connecting member 41a of the connecting portion 17a faces upward, and the first connecting member 41a of the connecting portion 17b is fitted. In the state where the protrusion 45 faces downward, the connecting portion 17a is in a low holding force state, and the connecting portion 17b is in a high holding force state. Thus, whether the connecting portions 17a and 17b are in the high holding force state or the low holding force state depends on the direction in which the fitting protrusion 45 of the first connecting member 41a faces. In other words, the connecting portions 17a and 17b are configured such that the holding force changes with the movement of the moving member 40 at a position where the ball chain 13 is turned. The connecting portions 17a and 17b are arranged separated from each other in the ball chain 13 so that when one is in a high holding force state, the other is in a low holding force state (so that the ball chain 13 is substantially divided into two in the circumferential direction). Has been. The connecting portions 17a and 17b are oriented in the same direction with respect to the circumferential direction of the ball chain 13 indicated by an arrow C in FIG. That is, the fitting protrusion 45 is directed in the direction of the arrow C in both the connecting portions 17a and 17b. Since the connecting portions 17a and 17b are oriented in this way, when one of the connecting portions 17a and 17b is located inside the room and the other is located outside the room, one is in a high holding force state and the other is low. It becomes a holding power state.

  The holding force when the connecting portions 17a and 17b are in a high holding force state is a normal pulling force that acts on the ball chain 13 during a normal solar shading material raising / lowering operation. It is set not to deviate from. Only when a large pulling force exceeding the normal pulling force is applied to the ball chain 13, the second connecting member 42 is connected to the second connecting member 42 by the expanded diameter portion 46 of the fitting protrusion 45 due to the elasticity of the synthetic resin of the second connecting member 42. The opening portions 49 a and 49 b of the member 42 are pushed and expanded so that the fitting protrusion 45 is detached from the second connecting member 42. As described above, the connecting portion 17a in the high holding force state is separated only when a certain large force is applied.

  On the other hand, the holding force when the connecting portions 17a and 17b are in the low holding force state is smaller than the holding force in the high holding force state, and even when a small force is applied, such as when it is caught by a light force. It is designed to be easily separated. By the presence of the connecting portion 17b in such a low holding force state, the loop-shaped ball chain 13 is always separated when it is caught with a light force, so that safety is improved.

Here, the effect of this embodiment is demonstrated using FIG.
In the state of FIG. 2, the connecting portion 17a and the connecting portion 17b are located inside and outside the room of the ball chain 13, respectively, the connecting portion 17a is in a high holding force state, and the connecting portion 17b is low. It is in the holding power state. When the bottom rail 5 is raised, the room inner portion of the ball chain 13 is pulled down in the direction of arrow A. At this time, a relatively strong separation force is applied to the connecting portion 17a, but since the connecting portion 17a is in a high holding force state, the ball chain 13 is not separated at the connecting portion 17a. Further, even when the room inner portion of the ball chain 13 is pulled down, no force is applied to the connecting portion 17b located at the outer portion of the ball chain 13, so that the connecting portion 17b in the low holding force state is not separated. On the other hand, in this state, when the ball chain 13 is caught with a light force, the connecting portion 17b which is in a low holding force state is separated to prevent the occurrence of an accident.

  When the ball chain 13 is pulled down in the direction of arrow A in FIG. 2 and the ball chain 13 is rotated by a half circumference, the positions of the connecting portion 17a and the connecting portion 17b are reversed as shown in FIG. In this state, the connecting portion 17b is in a high holding force state, and the connecting portion 17a is in a low holding force state. When the interior portion of the ball chain 13 is pulled down in the direction of arrow A in FIG. 24, a relatively strong separation force is applied to the connecting portion 17b, but the connecting portion 17b is in a high holding force state. The ball chain 13 is not separated. Further, in this state, when the ball chain 13 is caught with a light force, the connecting portion 17a in the low holding force state is separated and the occurrence of an accident is prevented.

  When the bottom rail 5 is lowered from the state shown in FIG. 24, the operation of preventing the self-weight drop of the stopper device 24 is released by lowering the room inner portion of the ball chain 13 in the direction of the arrow A. The ball chain 5 is lowered by releasing its hand. As described above, when the bottom rail 5 is lowered, a force is applied only to the connecting portion 17b in the high holding force state, and no force is applied to the connecting portion 17a in the low holding force state. The connecting portion 17a that is in a state does not come off unintentionally.

  The following can be said from the above contents. The maximum tension applied to one of the two parts of the ball chain 13 depending from the operation pulley 11 is greater than the maximum tension applied to the other part. The portion with the largest maximum tension is the high tension portion, and the portion with the smaller maximum tension is the low tension portion. In this embodiment, since the bottom rail 5 is lifted / lowered using only the interior portion of the ball chain 13, tension is applied only to the interior portion of the ball chain 13. Therefore, the room inner part of the ball chain 13 is a high tension part, and the room outer part of the ball chain 13 is a low tension part. The holding force of the connecting portions 17a and 17b in the high holding force state is larger than the maximum tension applied to the high tension portion, and the holding force of the connecting portions 17a and 17b in the low holding force state is the maximum force applied to the low tension portion. Make it larger than the tension. When the connecting portions 17a and 17b are located at the high tension portion, the connecting portions 17a and 17b are in a high holding force state, and when the connecting portions 17a and 17b are located at the low tension portion, the connecting portions 17a and 17b are placed. By configuring the connecting portion so that 17b is in a low holding force state, the connecting portion of the ball chain 13 is not separated by the operating force when the bottom rail 5 is raised and lowered, and is caught on the ball chain 13 with a light force. In this case, the connecting portion of the ball chain 13 is easily separated, so that safety is improved.

  In addition, it is as follows when expressed using torque applied to the operation pulley 11. The maximum torque required when rotating the operation pulley 11 in one direction is larger than the maximum torque required when rotating the operation pulley 11 in the other direction. The rotation direction with the larger maximum torque is the high torque rotation direction, and the rotation direction with the smaller maximum torque is the low torque rotation direction. In the present embodiment, when the bottom portion 5 of the ball chain 13 is pulled down to raise the bottom rail 5, the rotation direction of the operation pulley 11 is the high torque rotation direction, and the opposite direction is the low torque rotation direction. The holding force of the connecting portions 17a and 17b in the high holding force state is such that the torque when the operation pulley 11 is rotated in the high torque rotation direction by applying a tension corresponding to the holding force to the ball chain 13 in the high torque rotation direction. Set to be larger than the maximum torque. On the other hand, the holding force of the connecting portions 17a and 17b in the low holding force state is such that the torque when rotating the operation pulley 11 in the low torque rotation direction by applying a tension corresponding to the holding force to the ball chain 13 is low torque rotation. Set to be larger than the maximum torque in the direction. By setting the holding force of the connecting portions 17a and 17b in this way, it is possible to prevent the connecting portions 17a and 17b from being unintentionally separated during operation.

The present invention can also be implemented in the following embodiments.
In addition to the pleated screen, the present invention can also be applied to various solar shading devices (eg, horizontal blinds, scooping curtains, roll screens) that raise and lower the solar shading material using operation codes. Further, the present invention can also be applied to other shielding devices (eg, curtain rails, accordion curtains, vertical pleated screens, vertical roll screens, panel curtains, etc.) that open and close the shielding material using operation codes.
In the above embodiment, the fitting protrusions 45 of the first connecting members 41a and 41b are inserted into the fitting holes of the second connecting member 42, and both are fitted to each other to rotate relative to each other. However, the fitting protrusions 45 of the first connecting members 41a and 41b may be elastically fitted into the fitting holes of the second connecting member 42 (that is, pushed in by applying a strong force).
In the above embodiment, the bottom rail 5 is raised by lowering the room inner part of the ball chain 13, but the bottom rail 5 may be raised by lowering the room outer part of the ball chain 13. In that case, the room outside part of the ball chain 13 becomes a high tension part, and the room inside part becomes a low tension part. Accordingly, the ball chain 13 has a high holding force state when the connecting portions 17a and 17b are located on the outside portion of the ball chain 13 and a low holding force state when located on the inside portion of the room. By attaching the to the operation pulley 11, it is possible to improve safety while preventing the connecting portion of the ball chain 13 from being separated during operation.
・ In addition to the clutch method described above, the one-way clutch is a ratchet type in which the input side always engages the rotating body on the output side only in one rotation direction and transmits torque, or the needle type (inner ring peripheral surface) It is also possible to use another method such as a method in which the needle provided on the outer ring is moved in the rotational direction between the meshing position and the non-meshing position with respect to the cam surface of the outer ring.

2. Second Embodiment In the first embodiment, the connecting portions 17a and 17b have a three-member configuration including the first connecting members 41a and 41b and the second connecting member 42. However, in the present embodiment, the connecting portions 17a and 17b are connected to each other. As shown in FIG. 25, 17b has a two-member configuration including a first connecting member 41a and a second connecting member 41c. The second connecting member 41c has a configuration similar to that of the first connecting member 41b of the first embodiment, and the fitting portion 46 is fitted to the first connecting member 41b of the first embodiment. The portion 43 and the second connecting member 42 are combined. Therefore, the fitting structure of the first connecting member 41a and the second connecting member 41c of the present embodiment is the same as the fitting structure of the first connecting member 41a and the second connecting member 42 of the first embodiment. is there.

  Even in the configuration of the present embodiment, depending on the direction of the fitting protrusion 45 of the first connecting member 41a, it is determined whether the connecting portions 17a and 17b are in a high holding force state or a low holding force state. . Therefore, also in the present embodiment, as in the first embodiment, safety is enhanced by any one of the connecting portions 17a and 17b being in a low holding force state.

3. Third Embodiment As shown in FIGS. 26 to 27, in this embodiment, the operation cord is not a ball chain but an endless operation cord 14 having no ball.

  As shown in FIGS. 26 to 27, the operation cord 14 can be formed by connecting two main cords 14a and 14b with two connecting portions 17a and 17b. The main cords 14a and 14b are obtained by coating a core 86a formed of polyester, nylon or the like with an outer cord 86b knitted from polyester, and the linearity of the operation cord 14 is secured by the core 86a. Durability in the direction of elongation is ensured. At both ends of the main cords 14a and 14b, the core 86a is removed to form a cord insertion portion 86c.

  As in the first embodiment, the connecting portions 17a and 17b are formed by connecting the first fitting portion 43 provided at one end of the two first connecting members 41a and 41b to a cylindrical second connecting member (first (Second fitting portion) 42. Each of the first connecting members 41a and 41b includes a connecting cord 61. And the endless operation cord 14 is formed by fixing both by the method of sewing or welding in the state which inserted the connection cord 61 in the cord insertion part 86c.

  Even in the configuration of the present embodiment, depending on the direction of the fitting protrusion 45 of the first connecting member 41a, it is determined whether the connecting portions 17a and 17b are in a high holding force state or a low holding force state. . Therefore, also in the present embodiment, as in the first embodiment, safety is enhanced by any one of the connecting portions 17a and 17b being in a low holding force state.

You may implement the said embodiment in the following aspects.
The fitting structure of the connecting portions 17a and 17b is not particularly limited, and may be a three-member configuration as in the first embodiment or a two-member configuration as in the second embodiment.
The outer shape of the connecting portions 17a and 17b may not be a ball shape.
The main cords 14a and 14b may be of a string shape thinner than that shown in FIG.
The main cords 14a and 14b and the connecting portions 17a and 17b may be connected by a method other than the above.

4). Fourth Embodiment As shown in FIGS. 28 to 29, the present embodiment is similar to the first embodiment, but in this embodiment, the connecting portions 17a and 17b can be attached to and detached from the main cords 13a and 13b. By being connected, an endless ball chain 13 is formed.

  Balls 16b are provided at both ends of the main cords 13a and 13b. As in the first embodiment, the connecting portions 17a and 17b are formed by connecting the first fitting portion 43 provided at one end of the two first connecting members 41a and 41b to a cylindrical second connecting member (first (Second fitting portion) 42. The first connecting members 41a and 41b are each formed of a synthetic resin in a substantially rectangular parallelepiped shape, and a locking hole 82 opened in an oval shape is provided on the upper surface thereof so that the ball 16b can be inserted. Yes. As shown in FIG. 29, an insertion hole 83 connected to the locking hole 82 is opened at the center of the base end face of each of the first connection members 41 a and 41 b, and the insertion hole 83 is connected to the first connection via the guide groove 84. An opening is formed on the upper surface of the member 41. Then, when the ball 16b formed at the end of the main cords 13a and 13b is inserted into the locking hole 82 and the cord 15a connected to the ball 16b is inserted into the insertion hole 83 from the guide groove 84, the ball 16b is engaged. It is held in the stop hole 82.

  Even in the configuration of the present embodiment, depending on the direction of the fitting protrusion 45 of the first connecting member 41a, it is determined whether the connecting portions 17a and 17b are in a high holding force state or a low holding force state. . Therefore, also in the present embodiment, as in the first embodiment, safety is enhanced by any one of the connecting portions 17a and 17b being in a low holding force state.

You may implement the said embodiment in the following aspects.
This embodiment is applicable to operation codes other than the ball chain 13. In that case, instead of providing the balls 16b at both ends of the main cord, another shape of locking body may be provided. And the locking hole 82 should just be made into the shape which can lock the locking body.
The fitting structure of the connecting portions 17a and 17b is not particularly limited, and may be a three-member configuration as in the first embodiment or a two-member configuration as in the second embodiment.

5. 5th Embodiment As demonstrated in 1st Embodiment, in the state of FIG. 2, the connection part 17a is a high holding force state, and the connection part 17b is a low holding force state. In this state, when the interior portion of the ball chain 13 is pulled down in the direction of arrow A in FIG. 2, the connection portion 17b in the low holding force state engages with the operation pulley 11 as shown in FIG. It will be in the state. In this state, even when the ball chain 13 is caught with a light force, the operation pulley 11 may interfere and the connecting portion 17b may not be properly separated. Therefore, in the present embodiment, as shown in FIG. 30B, the ball chain 13 is provided with three connecting portions 17a, 17b, 17c, and these three connecting portions 17a, 17b, 17c It arrange | positions so that the distance between connection parts may leave | separate from the outer periphery half of the operation pulley 11. FIG. By arranging the three connecting portions 17a, 17b, and 17c in this manner, even when one connecting portion is engaged with the operation pulley 11, as shown in FIG. Since it is in a low holding force state, when it is caught on the ball chain 13 with a light force, it is surely separated and safety is improved.

  As a modified example, as shown in FIG. 31A, the ball chain 13 may be provided with four connecting portions 17a, 17b, 17c, and 17d. Even in this case, the four connecting portions may be arranged such that the distance between the two closest connecting portions is more than half of the outer periphery of the operation pulley 11.

  By generalizing the above contents, by providing n connection parts (n is 3 or more) in the operation cord so that the distance between the two closest connection parts is more than half of the outer periphery of the operation pulley 11. Even when one connecting part is engaged with the operation pulley, the other connecting part is in a low holding force state, so that when it is caught by the operation cord with a light force, it is surely separated and the safety is improved. It is done. The n connecting portions are preferably oriented in the same direction with respect to the circumferential direction of the operation cord. Moreover, it is preferable to provide n connection parts so that an operation code may be divided into n in the circumferential direction.

6). Sixth Embodiment In the first embodiment, the bottom rail 5 is raised by lowering the room inner part of the ball chain 13 to the arrow A in FIG. 2, and the room inner part of the ball chain 13 is moved in the direction of the arrow A in FIG. The bottom weight 5 is lowered by releasing the weight lowering prevention operation of the stopper device 24 by pulling it down, so that the outside portion of the ball chain 13 is not used.

  On the other hand, in this embodiment, as in Japanese Patent No. 3378813, a stopper device for preventing the bottom rail 5 from dropping its own weight is provided closer to the operation pulley 11 than the transmission clutch 21, and the operation of lowering the room chain outside portion of the ball chain 13 is performed. By releasing the disconnection clutch of the transmission clutch 21, the connection between the operation pulley 11 and the drive shaft 12 is released. Therefore, in the present embodiment, the room inner portion of the ball chain 13 is pulled down to raise the bottom rail 5, and the room outer portion of the ball chain 13 is pulled down to lower the bottom rail 5. Since the tension applied to the ball chain 13 when the disconnecting clutch is disconnected is lower than the tension applied to the ball chain 13 when the bottom rail 5 is pulled up, the interior portion of the ball chain 13 is high as in the first embodiment. It becomes a tension part, and the room outside part of the ball chain 13 becomes a low tension part. Therefore, also in the present embodiment, safety can be improved while preventing the connecting portion of the ball chain 13 from being separated during operation, based on the same principle as in the first embodiment.

You may implement the said embodiment in the following aspects.
The bottom rail 5 may be lowered in synchronization with the pulling-down operation by pulling down the room outside portion of the ball chain 13 in the direction of arrow B in FIG. Usually, the tension applied to the ball chain 13 when the bottom rail 5 is lowered is smaller than the tension applied to the ball chain 13 when the bottom rail 5 is pulled up. The portion becomes a high tension portion, and the room outside portion of the ball chain 13 becomes a low tension portion. Therefore, also in such an embodiment, safety can be enhanced while preventing the connecting portion of the ball chain 13 from being separated during operation by the same principle as in the first embodiment.

7). Seventh Embodiment In the first and sixth embodiments, of the two portions of the operation cord that hangs down from the operation pulley, the portion that rotates the operation pulley in the direction to raise the solar shading material (the lift operation portion) is high tension. However, in spring type roll screens, the tension applied to the operation cord when raising the solar shading material may be smaller than the tension applied to the operation cord when lowering the solar shading material. . In such a case, of the two portions of the operation cord that hangs down from the operation pulley, the portion that rotates the operation pulley in the direction in which the solar radiation shielding material is lowered (the lowering operation portion) is the high tension portion. Even in such a case, it is possible to improve safety while preventing the connecting portion of the ball chain 13 from being separated during operation by the same principle as in the first embodiment.

8). Eighth Embodiment An eighth embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment, and is mainly different in that a slit-like air vent 29a is provided on the fitting protrusion 45 of the first connecting member 41a. Hereinafter, the difference will be mainly described.

  In the first embodiment, the columnar moving member 40 is accommodated in the moving member accommodating portion 29 provided in the round shaft-like fitting protrusion 45 of the first connecting member 41 a. The holding force of the connecting portion is changed by moving the moving member 40, but the opening diameter of the moving member accommodating portion 29 and the outer diameter of the moving member 40 are substantially the same or the difference between them is very small. Since the inside of the moving member accommodating portion 29 is almost a sealed space, as shown in FIG. 23 (b), the moving member 40 is located substantially at the tip of the fitting protrusion 45 as shown in FIG. 23 (a). When the moving member 40 moves to a position away from the tip of the fitting protrusion 45, there is a problem that the movement of the moving member 40 may be hindered by the air in the moving member accommodating portion 29 interfering. .

  In this embodiment, as shown in FIG. 33, by providing the fitting protrusion 45 with a slit-like air vent portion 29 a communicating with the moving member accommodating portion 29, the moving member accommodating portion 29 is moved when the moving member 40 is moved. It becomes easy for air inside to escape, and the moving member 40 can move smoothly. The shape of the air vent portion 29a is not particularly limited, and may be a through hole communicating with the moving member accommodating portion 29, for example. When the air vent portion 29a is formed in a slit shape, the friction between the moving member 40 and the inner surface of the moving member accommodating portion 29 is reduced, and an advantage that the moving member 40 becomes easier to move is obtained.

  Further, a member surrounding the fitting protrusion 45 (e.g., the second connecting member 42 in the first embodiment, the second connecting member in the second embodiment, so that the air in the moving member accommodating portion 29 is more easily removed). 41c) may also be provided with an air vent.

9. Ninth Embodiment A ninth embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment, and is mainly different in that the movement of the moving member 40 is promoted by a movement promoting member (magnet in the present embodiment). Hereinafter, the difference will be mainly described.

  It is necessary to change the connecting portion in the operation pulley to a strong state as early as possible.

  In the present embodiment, as shown in FIG. 34, the moving member 40 is formed of a magnetic material (material that sticks to the magnet), and the magnet is adjacent to each engaging recess 11a of the operation pulley 11 on which the ball chain 13 is mounted. 11b is provided. As shown in FIG. 34 (a), when the connecting portion 17a is engaged with the engaging recess 11a, the attractive force between the moving member 40 and the magnet 11b moves toward the tip of the fitting protrusion 45 (FIG. 34). A force in the direction of arrow A in (a) is applied to the moving member 40. The movement of the moving member 40 is hindered by its own weight or a resistance force such as a frictional force with the inner surface of the moving member accommodating portion 29. However, as the position of the connecting portion 17a approaches the highest point of the operation pulley 11, the resistance force due to the weight of the moving member 40 decreases, and when the position of the connecting portion 17a exceeds the highest point of the operating pulley 11, the moving member 40 Movement is promoted by its own weight and attractive force. Therefore, at a certain point while the connecting portion 17a is engaged with the operation pulley 11 and swivels around the operation pulley 11, the moving member 40 is placed at the tip of the fitting protrusion 45 as shown in FIG. And the connecting portion 17a changes from the low holding force state to the high holding force state. The moving member 40 moves at any timing before reaching the highest point, when reaching the highest point, or after reaching the highest point. After reaching the highest point, the moving member 40 moves in the direction of travel of the connecting portion 17a by the combined force of its own weight and attractive force. As described above, in this embodiment, since the magnetic force is applied to the moving member 40 to promote the movement of the moving member 40, the mode can be switched at an early stage.

  Here, the attractive force of the magnet is applied to the moving member 40 to promote the movement of the moving member 40. However, the moving member 40 is composed of a magnet, and between the magnet provided on the operation pulley 11 and the moving member 40. A repulsive force may be generated and the movement of the moving member 40 may be promoted by the repulsive force. Furthermore, you may use together the attractive force and repulsive force by a magnet.

  Further, instead of providing the operation pulley 11 with a magnet, a magnetic force generated by a magnet provided at another position may be applied to the moving member 40. For example, as shown in FIG. 35, a weight 65 having a lower pulley 64 may be disposed at the lower end of the loop of the ball chain 13, and a magnet 64 b may be provided adjacent to the engaging recess 64 a of the lower pulley 64. In this case, the connecting portion 17a changes from the high holding force state shown in FIG. 35 (a) to the low holding force state shown in FIG. 35 (b).

10. Tenth Embodiment A tenth embodiment of the present invention will be described with reference to FIGS. In the embodiments so far, the holding force of the connecting portion has been switched by moving the moving member 40 in the moving member accommodating portion 29 provided in the fitting protrusion 45. With this configuration, the holding force of the connecting portion is switched. Specifically, in the present embodiment, the engaging portion of the connecting portion is configured to be disengaged by spreading outward in the radial direction of the operation cord 14, and the moving member 40 has an outer periphery of the engaging portion. From the side, the holding force of the connecting portion is changed by regulating / non-regulating deformation in the direction in which the engaging portion spreads. Hereinafter, the structure of a connection part and a moving member is demonstrated in detail.

  In this embodiment, as shown in FIGS. 36 to 37, the connecting portion 17 a is composed of complementary key-shaped portions 14 c and 14 d provided at both ends of the operation cord 14 and the holding force switching unit 100. .

  The key mold portions 14c and 14d are formed by melting the end portion of the operation cord 14 by applying heat or ultrasonic vibration in a state where the end portion of the operation cord 14 is sandwiched between split molds having a predetermined cavity shape. can do.

  As shown in FIG. 36 (b), the holding force switching unit 100 welds the hook-shaped members 90, 91 in a state where the cylindrical moving member 40 is accommodated inside the pair of hook-shaped members 90, 91. Can be formed. A moving member 40 is slidably disposed in the moving member accommodating portion 29 in the holding force switching unit 100. The frame-shaped members 90 and 91 and the moving member 40 are provided with openings 90a, 91a and 40a that are substantially the same as or slightly larger than the diameter of the operation cord 14, respectively. Are arranged in a line in the holding force switching unit 100, and the operation cord 14 can be inserted through these openings.

  A method of attaching the holding force switching unit 100 to the operation cord 14 is as follows. First, one end of the operation cord 14 is inserted into the openings 90a, 91a, and 40a, and in this state, the key-shaped portions 14c and 14d at both ends of the operation cord 14 are engaged. Next, as shown in FIG. 37 (a), the engaging portions 14 h of the key-shaped portions 14 c and 14 d are pulled into the moving member accommodating portion 29, and the engaging portions 14 h are moved from the longitudinal center of the moving member accommodating portion 29. The holding force switching unit 100 is fixed to the operation cord 14 using the fixing member 69 in a state of being disposed at the shifted position.

  As shown in FIG. 37A, in the state where the engaging portion 14h is surrounded by the moving member 40, the key-shaped portions 14c and 14d are not easily separated even if a tensile force is applied to the operation cord 14. Therefore, in the state of FIG. 37A, the connecting portion 17a is in a high holding force state.

  On the other hand, when the direction of the connecting portion 17a is reversed in accordance with the operation of the operation code 14, the moving member 40 slides within the moving member accommodating portion 29, and the state shown in FIG. In this state, since the engaging portion 14h is not surrounded by the moving member 40, the lock-shaped portions 14c and 14d are relatively easily separated when a tensile force is applied to the operation cord 14. Accordingly, in the state of FIG. 37 (b), the connecting portion 17a is in a low holding force state.

11. Eleventh Embodiment The eleventh embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the holding force of the connecting portion is switched by still another configuration. Also in this embodiment, similarly to the tenth embodiment, the moving member 40 changes the holding force of the connecting portion by restricting / non-restricting deformation in the direction in which the engaging portion expands from the outer peripheral side of the engaging portion. Configured as follows. Hereinafter, the structure of a connection part and a moving member is demonstrated in detail.

  In the present embodiment, an enlarged diameter portion 14 g is provided at one end of the ball chain 13. The expanded diameter portion 14g can be formed by the same method as the key-shaped portions 14c and 14d. At the other end of the ball chain 13, an engagement arm 63 that can be engaged with the expanded diameter portion 14g is formed. The engagement arm 63 can be formed by outsert molding or the like. The outer shape of the engagement arm 63 is substantially the same as that of the ball 16.

  The cord 15 adjacent to the expanded diameter portion 14g has a hook-shaped moving member 40 that can surround the expanded diameter portion 14g and the engaging portion 14h of the engaging arm 63 and is slidable relative to the cord 15. Provided.

  As shown in FIG. 38A, in the state where the engaging portion 14 h is surrounded by the moving member 40, the expanded diameter portion 14 g and the engaging arm 63 are not easily separated even when a tensile force is applied to the ball chain 13. Therefore, in the state of FIG. 38A, the connecting portion 17a is in a high holding force state.

  On the other hand, when the direction of the connecting portion 17a is reversed in accordance with the operation of the ball chain 13, the moving member 40 slides along the small diameter portion 14e, and the state shown in FIG. In this state, since the engaging portion 14h is not surrounded by the moving member 40, the expanded diameter portion 14g and the engaging arm 63 are relatively easily separated when a tensile force is applied to the ball chain 13. Accordingly, in the state of FIG. 38B, the connecting portion 17a is in a low holding force state.

The moving member 40 may be moved only by its own weight, or the movement of the moving member 40 may be promoted by the movement promoting member. The movement promoting member may be a magnet as described in the ninth embodiment, or may be mechanical means as described below.
FIG. 39 shows an example in which a mode switching pulley 66 is provided adjacent to the operation pulley 11. The mode switching pulley 66 includes a rotating plate 66a and a protrusion 66b provided so as to protrude from the main surface of the rotating plate 66a. In the present embodiment, the plurality of protrusions 66b are provided at equal intervals in the circumferential direction. The rotating plate 66 a is configured to rotate at a higher speed than the operation pulley 11 in conjunction with the rotation of the operation pulley 11.

  The operation pulley 11 is provided with an engagement recess 11a that engages with the ball 16 or the engagement arm 63, and a pocket 11c that is provided adjacent to the engagement recess 11a and avoids interference with the moving member 40. Yes. The plurality of engaging recesses 11 a and pockets 11 c are provided on the outer periphery of the operation pulley 11 at equal intervals in the circumferential direction so as to match the pitch of the balls 13 of the ball chain 13.

  As shown in FIG. 39 (a), when the engagement arm 63 is engaged with the engagement recess 11a and goes around the operation pulley 11, the mode switching pulley 66 rotates at a higher speed, and the protrusion 66b. By pushing up the moving member 40 from below, the moving member 40 quickly moves to a position adjacent to the engagement arm 63 as shown in FIG. As a result, the connecting portion 17a is quickly switched from the low holding force state to the high holding force state.

  FIG. 40 shows an example in which mode switching is performed using the lower pulley 64 disposed at the lower end of the loop of the ball chain 13. The lower pulley 64 is provided with an engagement recess 64a that engages with the ball 16 or the engagement arm 63, and a pocket 64c that is provided adjacent to the engagement recess 64a and that avoids interference with the moving member 40. Yes. A tapered surface 64d is provided between the engaging recess 64a and the pocket 64c.

  The tapered surface 64d is formed at a position where it abuts on the tapered surface 40d of the moving member 40 and pushes the moving member 40 upward when the engaging arm 63 is engaged with the engaging recess 64a. According to such a configuration, when the engagement arm 63 is engaged with the engagement recess 64a, the moving member 40 is forcibly separated from the engagement arm 63, so that the connecting portion 17a is lowered from the high holding force state. Switch to holding force state reliably. In addition, in order to lengthen the range in which the taper surface 64d and the taper surface 40d can contact, the inclination of the taper surface 64d is made gentler than that of the taper surface 40d.

1: Head box 4: Screen 5: Bottom rail 7: Lifting cord 8: Support member 10: Winding shaft 11: Operation pulley 12: Drive shaft 13: Ball chain 14: Operation cord 21: Transmission clutch 24: Stopper device 36: Governor device 39: Pitch holding cord 40: Moving member

Claims (10)

An operation cord that is used to open and close the shielding member by being rotated on the operation pulley and rotating the operation pulley.
The operation cord includes at least two connecting portions that are separated when a separating force exceeding a holding force is applied,
The connecting portion is configured such that the holding force changes according to the direction in which the connecting portion is directed,
In the state where the connecting portion is hooked on the operation pulley, when at least one of the connecting portions is in a high holding force state, at least one of the connecting portions is in a low holding force state. The operation code is arranged as follows. The operation cord includes n (n is 3 or more) connecting portions, and the n connecting portions are arranged such that the distance between the two closest connecting portions is more than half of the outer periphery of the operating pulley. The operation code according to claim 1, which is disposed in The said connection part is provided with the moving member which can move with the change of the direction in which the said connection part is turned, and it is comprised so that holding force may change with the movement of the said movement member. 2. The operation code according to 2. The engaging portion of the connecting portion is configured to be disengaged by spreading outward in the radial direction of the operation cord, and the moving member is configured so that the engaging portion is disengaged from the outer peripheral side of the engaging portion. The operation cord according to claim 3, wherein the operation cord is configured to change a holding force of the coupling portion by restricting / non-regulating deformation in a spreading direction. A shielding device that opens and closes a shielding material by rotating the operation pulley by operation of an operation code hung on the operation pulley;
The said operation code is a shielding apparatus which is the operation code as described in any one of Claims 1-4. The maximum tension applied to one of the two portions of the operation cord suspended from the operation pulley is greater than the maximum tension applied to the other, and the portion having the larger maximum tension is defined as the high tension portion, and the maximum tension The part with the smaller is the low tension part,
The connection portion is configured to be in a high holding force state when positioned in the high tension portion and to be in a low holding force state when positioned in the low tension portion. The shielding apparatus as described. The holding force of the connecting portion in a high holding force state is greater than the maximum tension applied to the high tension portion, and the holding force of the connecting portion in a low holding force state is greater than the maximum tension applied to the low tension portion. The shielding device according to claim 6 which is large. The shielding according to any one of claims 5 to 7, further comprising a one-way clutch that does not transmit rotation of the operation pulley in a direction in which the shielding material is lowered to a drive shaft for opening and closing the shielding material. apparatus. The connecting portion includes a moving member that can move according to a change in a direction in which the connecting portion is directed, and is configured such that a holding force changes as the moving member moves, and the movement of the moving member moves. The shielding device according to claim 5, wherein the shielding device is configured to be promoted by a promotion member. A shielding device that opens and closes a shielding material by rotating the operation pulley by an operation of an operation cord mounted on the operation pulley;
The operation cord includes a connecting portion that is separated when a separation force having a magnitude exceeding the holding force is applied,
The connecting portion is configured such that the holding force changes with the movement of the moving member at a position where the operation cord is turned,
A shielding device configured to facilitate movement of the moving member by a movement promoting member.