JP5193849B2 - Blind operating device - Google Patents

Description

  The present invention relates to a blind operating device.

  2. Description of the Related Art Conventionally, there is known a so-called horizontal blind operating device that lifts and lowers a plurality of slats supported at regular intervals through an endless operation cord suspended from one end of a head box. In this horizontal blind, generally, a plurality of slats extending in the horizontal direction and a bottom rail disposed at the lower end thereof are supported by a ladder-like support cord suspended from the head box. Then, the slats are moved up and down by pulling up and down the lifting cord that vertically extends downward from the inside of the head box through each slat and is connected to the bottom rail at the lower end.

  For example, the following configuration is known as an operating device that raises or lowers an elevating cord. That is, a drum for winding the lifting / lowering cord is provided on a drive shaft that is pivotally supported inside the head box, and the upper end of the lifting / lowering cord is locked to the drum. Then, a pulley is connected to one end side of the drive shaft via a transmission mechanism including a gear, and the drive shaft is rotated by rotating the pulley through operation of an operation cord. The drum rotates with the rotation of the drive shaft, and the slats are moved up and down by the winding cord being wound or unwound on the drum.

  However, the conventional blind operating device has the following problems. That is, the blind provided with the operation device is used, for example, as a sunshade or blindfold by being attached to a window.For example, when an indoor person walks in the vicinity of the blind, the loop portion of the operation code is There was a risk of entanglement with a part of the human body such as hands and arms. In particular, when the operation cord is entangled with the neck, it can be a big problem. Therefore, in order to solve such problems, for example, blind operating devices such as those described in Patent Documents 1 and 2 have been proposed. In any of these operation devices, when a part of a human body such as a neck is entangled with the loop portion of the operation cord, both sides of the operation cord are simultaneously pulled downward.

  In the operation device of Patent Document 1, while lifting both sides of the operation cord wound on the lower side of the pulley upward, both sides of the operation cord are suspended downward while being hooked on the upper side walls of the pulley case. Yes. That is, the operation code is routed in an M shape. When both sides of the operation cord are pulled downward at the same time, a downward force is applied to the pulley case via both side walls thereof, so that the pulley case is moved from the head box and the like together with the pulley and the operation cord. Come off. This avoids problems such as neck tightening due to the operation cord.

Further, in the operation device of Patent Document 2, in a pulley case that supports a pulley around which a ball chain is wound, a lower portion of a support hole into which a shaft portion of the pulley is inserted and supported is cut out slightly. When both sides of the ball chain are pulled downward at the same time, the shaft portion of the pulley passes downward so as to expand the notch portion of the pulley case. Deviate from. This avoids problems such as neck tightening due to the operation cord.
US Pat. No. 6,116,325 US Pat. No. 6,749,000 specification

  According to the operation devices of Patent Documents 1 and 2, problems such as neck tightening due to the operation cord are certainly avoided. However, the operation devices of Patent Documents 1 and 2 still have room for improvement in the following points. In other words, as described above, since the operation device of Patent Document 1 needs to handle the operation code in a special form such as an M-shape, there is a problem that the operation work of the operation code becomes complicated. Further, in the same document, since the normal operation is performed with both sides of the operation cord hooked on the upper side walls of the pulley case, both sides of the pulley case and the operation cord are operated during the operation. There is a risk that the force required for the operation of the operation cord, that is, the operation force may increase due to the sliding resistance generated between the operation code and the operation force.

  On the other hand, the operation device of Patent Document 2 does not require special handling of the operation code as found in Patent Document 1. That is, the normal handling is such that both sides of the ball chain wound around the upper part of the pulley are suspended in the tangential direction of the pulley. For this reason, problems such as complicated handling of the ball chain or increased operating force do not occur. However, in Patent Document 2, as described above, when both sides of the ball chain are pulled downward at the same time, the shaft portion of the pulley passes downward so that the notch portion of the pulley case is expanded. The configuration is adopted. For this reason, every time the pulley is removed from the pulley case, the notch portion of the pulley case gradually expands, which may cause the pulley to be easily detached from the pulley case.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a blind operating device capable of stably maintaining the magnitude of the external force required to remove the pulley over a long period of time. Is to provide.

  In the first aspect of the present invention, the rotational force is operatively connected to the pulley by rotating a pulley supported rotatably at one end of the head box through the operation of an endless operation cord wound around the pulley. In a blind operating device that transmits to a drive shaft that is rotatably supported inside the head box via a transmission mechanism, and lifts and lowers the solar shading material supported suspended from the head box through the rotation of the drive shaft. The pulley is detachably connected to a connection member of the transmission mechanism that is exposed to the outside of the head box outside the head box, and a magnetic force attracting each other is applied between the pulley and the connection member. That the connection state with respect to the connection member is maintained by being adsorbed by the connection member through an adsorption force by magnetic force. And effect.

  According to the present invention, when an external force exceeding the attractive force due to the magnetic force is applied through the operation cord, the pulley around which the operation cord is wound is detached from the head box together with the pulley case. The magnetic force does not change greatly even if the pulley or the like is repeatedly removed. For this reason, the magnitude of the external force required to remove the pulley can be stably maintained over a long period of time. Further, unlike the case where a configuration in which the pulley case or the like is removed from the head box by urging the pulley case downward or the like through the operation cord, no special handling of the operation cord is required. This is because it is not necessary to hook the operation cord on the pulley case in order to bias the pulley case downward.

  According to a second aspect of the present invention, in the blind operating device according to the first aspect, the pulley is provided with a magnet or a magnetic body, while the connecting member is provided with a magnetic body or a magnet, The gist of the invention is to apply magnetic forces attracting each other between the connecting members.

  According to the present invention, since it is only necessary to provide a magnet and a magnetic body attracted to the pulley and the connecting member side of the transmission mechanism, the pulley can be attracted to the head box side without complicating the configuration. it can. Note that the magnitude of the external force required for the pulley to come off from the head box side can be easily set through the adjustment of the attractive force (magnetic force) by the magnet.

  According to a third aspect of the present invention, in the blind operating device according to the first or second aspect, the pulley is rotatably accommodated in a pulley case and via an opening formed in the pulley case. The pulley and the connecting member are engaged and connected so as to be integrally rotatable, and the connecting surfaces of the pulley and the connecting member are aligned with each other along the rotation direction of the pulley and the connecting member. The gist of the invention is that a taper taper that decreases in diameter toward the opposite side surface is formed.

  According to the present invention, when an external force exceeding the attractive force due to the magnetic force acts on the pulley via the operation cord, when the pulley is detached from the head box together with the pulley case, the pulley is smoothly detached without being caught by the connecting member.

  According to a fourth aspect of the present invention, in the blind operating device according to any one of the first to third aspects, the pulley is connected to the connecting member through a concavo-convex structure formed between the connecting member and the pulley. The concavo-convex structure includes a plurality of convex portions and a plurality of concave portions that are fitted to each other, and a draft surface is formed at a portion where the convex portions and the concave portions are engaged with each other. The gist.

  According to the present invention, when an external force exceeding the attractive force due to the magnetic force acts on the pulley via the operation cord, when the pulley is detached from the head box together with the pulley case, specifically, between the pulley and the connecting member, The pulleys can be smoothly removed from the head box without being caught between the protrusions and the recesses that fit together.

  According to a fifth aspect of the present invention, in the blind operating device according to the third or fourth aspect, a latching portion that opens upwardly projects from a lower portion of the side surface of the pulley case on the head box side, The gist of the latching portion is that the latching portion is extrapolated from below and latched to a latching portion provided at a lower portion of the head box.

  It is assumed that the operation cord is operated while being pulled obliquely in a direction along the rotation center axis of the pulley, for example, in the blind operator side (a direction away from the head box). At this time, according to the present invention, the hook portion of the pulley case is hooked to the hook portion of the head box, so that the displacement of the pulley case toward the operator is restricted. Therefore, unintentional drop-off from the pulley case during normal operation, and thus the pulley accommodated therein, from the head box is suppressed. In addition, since the latching | locking part of a pulley case is hooked by being extrapolated to the to-be-latched part by the side of a head box from the downward direction, the downward displacement of the said pulley case is accept | permitted. For this reason, when an external force exceeding the attractive force due to the magnetic force acts downward on the pulley via the operation cord, the pulley is smoothly detached from the head box together with the pulley case.

  According to a sixth aspect of the present invention, in the blind operating device according to the fifth aspect, the head box is engaged with an upper portion of the pulley case to restrict relative displacement with respect to the head box. The gist of the invention is that a stopper handle is provided which is disengaged from the upper position of the pulley case and is disengaged from a release position allowing relative displacement with respect to the head box.

  For example, when installing a blind in a place operated by many people, it may be desired to prevent the pulley case from being detached from the head box. In such a case, the relative displacement of the pulley case with respect to the head box may be restricted by displacing the stopper handle from the release position to the engagement position. Here, the relative displacement of the pulley case with respect to the head box includes a displacement of the pulley case in a direction away from the head box or a downward displacement of the pulley case with respect to the head box. As described in claim 5, normally, the lower portion of the pulley case is maintained in a state where displacement in a direction away from the head box is restricted. In this state, according to the present invention, if the stopper handle is engaged with the upper part of the pulley case to restrict the displacement of the pulley case upper part in the separating direction with respect to the head box, the two upper and lower parts of the pulley case In this case, the displacement in the separation direction with respect to the head box is restricted. Further, the downward displacement of the pulley case with respect to the head box is also restricted through the engagement of the stopper handle. Therefore, the pulley case does not come off the head box even when an external force exceeding the attracting force by the magnetic force acts on the pulley in the direction away from or below the head box. In this way, the effective state and the invalid state of the blind protection function can be easily switched through the operation of the stopper handle.

  A seventh aspect of the present invention is the blind operating device according to any one of the first to sixth aspects, wherein the pulley has a cylindrical shape around which the operation cord is wound and both ends are opened. A drive pulley, a cylindrical power transmission member that is provided so as to be integrally rotatable inside the drive pulley, and is connected to the connection member of the transmission mechanism via an opening of the drive pulley, and the drive pulley The gist of the invention is that it includes a clutch mechanism that cuts off power transmission between the drive pulley and the power transmission member when a predetermined rotational force is applied.

  For example, when the operation cord is further operated while the solar radiation shielding material is held at the predetermined upper limit position or lower limit position, it is assumed that an excessive operating force acts on the drive pulley. In this regard, according to the present invention, when a predetermined rotational force is applied to the drive pulley, power transmission between the drive pulley and the power transmission member is interrupted. Therefore, it is possible to suppress an excessive rotational load from being applied to the drive pulley, and hence the connecting portion between the power transmission member and the transmission mechanism. Further, unintentional disconnection of the operating device from the head box is also suppressed.

  According to an eighth aspect of the present invention, in the blind operating device according to the seventh aspect, the clutch mechanism is disposed in an annular shape inside the power transmission member and penetrates a peripheral wall of the power transmission member. A plurality of pins that engage with a plurality of engaging recesses formed on the inner peripheral surface of the drive pulley at intervals in the circumferential direction, and each pin is provided on the inner peripheral side of each pin to transmit the power to the pin A ring spring that holds each pin in a state of being engaged with an engagement recess of the drive pulley while urging the member in the radial direction all the time and leaving a part of the pin on the power transmission member side. The gist of this is

  Normally, each pin provided in the power transmission member is engaged with the drive pulley while leaving a part of each pin on the power transmission member side by the elastic force of the ring spring provided on the inner peripheral side of these pins. It is held in a state engaged with the recess. For this reason, the rotational force of the drive pulley around which the operation cord is wound is transmitted to the power transmission member via each pin. The rotational force of the power transmission member is transmitted to the drive shaft in the head box via the transmission mechanism.

  Here, for example, when the operation cord is pulled while the solar shading material such as the slat is at the lower limit position or the upper limit position, an excessive rotational load acts on the pulley, leading to damage of the pulley. There is concern. There is also a concern that the operating device may be detached from the head box, although the situation should not be removed. In this regard, according to the present invention, when an overload is applied to the pulley (more precisely, the driving pulley around which the operation cord is wound), that is, a force exceeding the engaging force between each pin and each engaging recess of the driving pulley is applied, Each pin is displaced inward of the power transmission member against the elastic force of the ring spring, and the diameter of the ring spring is reduced accordingly. As a result, the engagement state between each pin and the drive pulley is released, and the power transmission of the drive pulley and the power transmission member is interrupted. Therefore, only the driving pulley around which the operation cord is wound rotates, and this rotational force is not transmitted to the power transmission member. In this way, when the aforementioned so-called overload is applied to the drive pulley, the drive pulley idles, so that excessive rotation occurs in the drive pulley, and consequently, the connecting portion between the power transmission member and the transmission mechanism side, and the like. It can suppress that load is applied. Further, unintentional disconnection of the operating device from the head box is also suppressed.

  According to a ninth aspect of the present invention, in the blind operating device according to the seventh aspect, the power transmission member is provided so as to be displaceable in a direction along the axis of the drive pulley and through the opening of the drive pulley. A plurality of convex portions and a plurality of concave portions constituting the concave-convex structure are provided in a ring shape through engagement with the connection member through a concave-convex structure provided between the transmission mechanism and the connection member. By forming a draft angle surface at the portions that engage with each other, when the power transmission member rotates, a force in a direction in which the engagement with the convex portion and the concave portion is released is counteracted by the coupling member. The force is applied to the power transmission member as a force, and the clutch mechanism is disposed on the side of the power transmission member opposite to the connection member and constantly biases the power transmission member toward the connection member. And by the spirit thereof to become comprises a biasing member for maintaining the coupling state between the power transmitting member and the connecting member.

  In normal times, the power transmission member is constantly urged toward the connecting member by the urging force of the urging member disposed on the side opposite to the connecting member. Thereby, a power transmission member is maintained in the state connected with the connection member via the opening part of the drive pulley. That is, through operation of the operation cord, the drive pulley and the power transmission member rotate integrally, and this rotational force is transmitted to the drive shaft in the head box via the connecting member and eventually the transmission mechanism.

  Here, for example, when the operation cord is further pulled while the solar shading material such as the slat is at the lower limit position or the upper limit position, an excessive rotational load acts on the pulley, leading to damage of the pulley. There is concern. In addition, there is a concern that the operating device may be unintentionally disconnected from the headbox in spite of the situation that should not be removed. In this regard, according to the present invention, when an overload is applied to the pulley (more precisely, the drive pulley around which the operation cord is wound and the power transmission member provided so as to rotate integrally therewith), the power transmission member Is displaced against the urging force of the urging member in a direction in which the engagement between the concave portion and the convex portion is released, that is, in a direction away from the connecting member. For this reason, the power transmission of the power transmission member and the connecting member is interrupted. Therefore, although the drive pulley and the power transmission member rotate, this rotational force is not transmitted to the connection member of the transmission mechanism. As described above, when the above-described overload is applied to the pulley, it is possible to prevent an excessive rotational load from being applied to a connection portion with the transmission mechanism side and the like by the pulley rotating idly. Further, unintentional disconnection of the operating device from the head box is also suppressed.

  According to a tenth aspect of the present invention, in the blind operating device according to any one of the first to ninth aspects, the connecting member is provided on both the front surface and the back surface of the head box. This is the gist.

  According to the present invention, the operating device can be attached to either the front side or the back side of the head box. That is, the blind operation type can be easily reversed from side to side.

  According to the present invention, the magnitude of the external force required to remove the pulley can be stably maintained over a long period of time while avoiding special handling of the operation cord.

<First Embodiment>
A first embodiment in which the present invention is embodied as a so-called horizontal blind will be described below with reference to FIGS.

<Overview of the whole>
As shown in FIG. 1, a horizontal blind has a multistage slat (sunlight shielding material) 13 suspended from a head box 11 via a plurality of ladder cords 12, and a bottom at the bottom of these ladder cords 12. The rail 14 is attached. The upper end portion of the ladder cord 12 is supported by a tilt device (angle adjusting device) (not shown) disposed inside the head box 11. The tilt device rotates the slats 13 in the vertical direction in the same phase via the ladder cord 12 based on the rotation of the drive shaft 15 disposed inside the head box 11.

  Each slat 13 is penetrated by a plurality of lifting cords 16 suspended from the head box 11, and the lower ends of the lifting cords 16 are connected to the bottom rail 14. The upper end of the lifting / lowering cord 16 is wound around a winding device (not shown) disposed inside the head box 11. The winding device winds and unwinds the lifting / lowering cord 16 based on the rotation of the drive shaft 15. And the bottom rail 14 raises / lowers through winding or unwinding of the raising / lowering cord 16, and the slat 13 also raises / lowers along with this.

  The angle adjustment operation and the raising / lowering operation of each slat 13 are performed through the operation of the operation device 21 provided at one end of the head box 11. That is, the operating device 21 is operatively connected to the drive shaft 15 via a gear box 22 provided inside the head box 11, and the operation of the endless operating cord 23 suspended from the operating device 21 is used to operate the slat 13. An angle adjustment operation or an elevating operation is performed.

<Gearbox>
As shown in FIG. 2, an output bevel gear 31 fixed to the end of the drive shaft 15 and two input bevel gears 32 and 33 meshing with the output bevel gear 31 are rotatably provided in the gear box 22. Yes. The two input bevel gears 32 and 33 rotate about an axis orthogonal to the rotation center axis of the output bevel gear 31. The ends of the input shafts 32a and 33a of the two input bevel gears 32 and 33 are exposed to the outside through the side wall of the gear box 22 and the side wall of the head box 11. The operating device 21 can be operatively connected to the input shafts 32 a and 33 a via transmission mechanisms 34 and 35 provided outside the head box 11.

  Usually, the operating device 21 is connected to the front side (for example, indoor side) of the two transmission mechanisms 34 and 35. For example, when the operating device 21 is connected to the transmission mechanism 34 corresponding to one input shaft 32 a, the operating force of the operation cord 23 is transmitted to the input bevel gear 32 via the transmission mechanism 34, and the input bevel gear 32. With the rotation, the output bevel gear 31 and the drive shaft 15 rotate integrally. Similarly, when the operating device 21 is connected to the transmission mechanism 35 corresponding to the input shaft 33a, the output bevel gear 31 and the drive shaft 15 are rotated with the rotation of the other input bevel gear 33 through the operation of the operation cord 23. Rotate together.

<Connecting part on the head box side>
Next, the structure of the transmission mechanisms 34 and 35 on the head box 11 side to which the operating device 21 is operatively connected will be described.

  As shown in FIG. 3, in the gear box 22, a columnar support portion 41 is formed on the outer surfaces of two side walls facing each other with the output bevel gear 31 interposed therebetween. These support portions 41 have insertion holes 42 into which the input shafts 32a and 33a of the input bevel gears 32 and 33 are rotatably inserted. On the other hand, in the head box 11, an insertion hole 43 through which the support portion 41 of the gear box 22 can be inserted is formed on the side walls facing each other with the gear box 22 interposed therebetween. The support portions 41 of the gear box 22 are inserted into the insertion holes 43 from the inside and exposed to the outside. And the transmission mechanisms 34 and 35 are provided corresponding to the exposed part of these support parts 41. As shown in FIG. Note that these transmission mechanisms 34 and 35 have the same configuration except that the attachment portion to the head box 11 is different between the front side and the back side. For this reason, in this example, only the configuration of the transmission mechanism 35 on the back side will be described, the same reference numerals will be given to the member configuration of the transmission mechanism 34 on the front side, and the duplicate description will be omitted.

  As shown in FIG. 4, the transmission mechanism 35 includes a square plate-like base 51 attached from the outside so as to cover the exposed portion of the support portion 41. The base 51 is fixed to the gear box 22 by an engagement protrusion 52 formed at the upper part thereof being inserted through the side wall of the head box 11 and a countersunk screw 53 being inserted and tightened at the lower part thereof. Has been. The rotation of the base 51 is restricted by the engagement protrusion 52 penetrating through the side wall of the head box 11. Further, a part of the engaging protrusion 52 is locked to the inner surface of the side wall of the head box 11, so that the upper portion of the base 51 is restricted from being separated from the outer surface of the side wall of the head box 11. For this reason, the base 51 is securely fixed to the head box 11.

  A through hole 54 having a slightly smaller diameter than the outer diameter of the support portion 41 of the gear box 22 is formed in the central portion of the base 51. An annular shaft portion 55 that extends along the through hole 54 protrudes from the outer surface of the base 51. A connecting member 56 having a truncated cone shape is inserted into and supported by the shaft portion 55 so as to be rotatable. On the outer peripheral surface of the connecting member 56, a taper surface 57 having a diameter that decreases toward the side opposite to the head box 11 is formed. Further, a support hole 58 through which the shaft portion 55 can be inserted is formed in the central portion of the connecting member 56. In addition, on the side surface of the connecting member 56 opposite to the head box 11, a number of concave teeth 59 extending in the radial direction of the connecting member 56 are annularly arranged around the support hole 58. The inner shape of the concave teeth 59 is a rectangular parallelepiped shape, and the draft surfaces that incline so as to approach each other toward the inner bottom surface of the concave teeth 59 on the inner surfaces of two pairs (four in total) facing each other. 59a is formed. Further, on the side surface of the connecting member 56 opposite to the head box 11, an annular housing recess 60 is formed around the support hole 58 in a countersink shape. Four engaging recesses 61 communicating with the recess 60 are extended to the concave tooth 59 side. The four engaging recesses 61 are provided at equal intervals in the circumferential direction of the connecting member 56. And the magnet receiving member 71 integrally formed with magnetic bodies, such as iron, is mounted | worn with the accommodation recessed part 60. As shown in FIG. In this example, the magnet receiving member 71 is made of an iron-type sintered metal.

  The magnet receiving member 71 includes a cylindrical insertion portion 72 having one end opened, and an annular flange 73 formed on the opening edge of the insertion portion 72. Four engaging protrusions 74 are provided on the peripheral surface of the flange 73. These engaging protrusions 74 are formed at equal intervals in the circumferential direction of the magnet receiving member 71. And the magnet receiving member 71 is inserted in the accommodation recessed part 60 in the state which made each engagement protrusion 74 correspond to each engagement recessed part 61. As shown in FIG. As shown in FIG. 3, the insertion portion 72 of the magnet receiving member 71 is inserted into the through hole 54 of the base 51 exposed in the support hole 58. The distal end surface of the insertion portion 72 is in contact with the input shaft 33 a exposed from the insertion hole 42 of the gear box 22. The flange 73 of the magnet receiving member 71 is fitted in the housing recess 60, and the engagement protrusions 74 are fitted in the engagement recesses 61. Thereby, the relative rotation between the magnet receiving member 71 and the connecting member 56 is restricted. Further, the side surface of the magnet receiving member 71 opposite to the head box 11 and the side surface of the connecting member 56 opposite to the head box 11 are in a state in which there is no level difference, that is, in a flush state. In this state, the magnet receiving member 71 is fixed to the input shaft 33a by inserting the screw 75 from the flange 73 side of the magnet receiving member 71 and fastening it to the input shaft 32a. Therefore, the input bevel gear 33, the magnet receiving member 71, and the connecting member 56 rotate integrally around the shaft portion 55 of the base 51. The head of the screw 75 is kept in a state of being accommodated in the insertion portion 72 of the magnet receiving member 71. That is, the head of the screw 75 does not protrude from the outer surface of the magnet receiving member 71.

  The operating device 21 is detachably connected to one of the two transmission mechanisms 34 and 35 configured as described above. There are two types of horizontal blind operation types: a right operation type in which the operation code 23 is suspended from the right end of the head box 11, and a left operation type in which the operation code 23 is also suspended from the left end of the head box 11. Which type is used determines which of the two transmission mechanisms 34 and 35 the operating device 21 is connected to. In this example, when the operation device 21 is connected to the transmission mechanism 34 on the front side of the head box 11, the right operation type is used, and when the operation device 21 is connected to the transmission mechanism 35 on the back side, the left operation type is used. It becomes.

<Operation device>
Next, the configuration of the blind operating device will be described in detail.
<Pulley case>
As shown in FIG. 3, the pulley case 81 of the operating device 21 includes a case main body 82 disposed outside the head box 11 and a cover 83 attached to the case main body 82. Both the case main body 82 and the cover 83 are made of a synthetic resin material.

  As shown in FIG. 4, the case main body 82 has a bottomed box shape that opens from one side to the lower part, and the bottom wall on the head box 11 side is connected to the connecting member 56 on the head box 11 side. A circular opening 84 having a larger diameter is formed. Further, in the inverted U-shaped side wall of the case main body 82, a locking projection 85 is formed on the outer surface of the two end portions located at the lower portion thereof, and an engagement hole 86 is also formed on the top thereof. ing.

  Further, as shown in FIG. 5, a hooking portion 87 having an L-shaped cross section extending in the left-right direction is formed at the bottom of the bottom surface of the case body 82. A latching groove 87a is formed on the top surface of the latching portion 87 over its entire length. Two hooks 11a and 11b provided opposite to each other at both side edges along the longitudinal direction on the bottom surface of the head box 11 can be engaged with the hooking groove 87a (see FIG. 3). ). As shown in FIG. 5, a stopper member 88 having an L-shaped cross section is formed on the upper surface of the bottom surface of the case main body 82. As shown by a one-dot chain line in the upper left of FIG. 3, the stopper member 88 is engageable with a stopper handle 89 that is slidably provided on upper portions of side walls facing each other. The stopper handle 89 will be described in detail later.

  As shown in FIG. 5, the cover 83 covers the opening in the side portion of the case main body 82, and is formed in a plate shape having an inverted U-shaped outer shape corresponding to the opening. Two locking walls 90 project from the side edges of the cover 83 so as to be orthogonal to the cover 83, and the locking walls 90 have locking holes corresponding to the locking projections 85 on the case body 82 side. 91 is formed. Further, an engagement protrusion 92 corresponding to the engagement hole 86 on the case body 82 side is formed on the top of the cover 83. And while inserting this engagement protrusion 92 into the engagement hole 86 of the case main body 82 from the inside, the lower part of the side wall of the case main body 82 is interposed between the two locking walls 90, 90 to lock the side wall. The cover 83 is fixed to the case body 82 by the protrusion 85 being locked in the locking hole 91 on the cover 83 side.

<Pulley>
As shown in FIG. 3, a pulley 100 is rotatably accommodated in the pulley case 81. The pulley 100 includes a cylindrical driving pulley 101 having both ends opened, and a cylindrical power transmission member 102 fitted to the driving pulley 101. Both the drive pulley 101 and the power transmission member 102 are made of a synthetic resin material.

<Drive pulley>
As shown in FIG. 4, a plurality of claw members 103 are provided on the outer peripheral surface of the drive pulley 101. The claw members 103 are provided in two rows in the direction along the rotation center axis of the drive pulley 101 and at regular intervals around the rotation center axis. Among these claw members 103, the first claw member 103 a constituting the row farther from the cover 83 and the second claw member 103 b constituting the row closer to the cover 83 are the rotational directions of the drive pulley 101. Are arranged in a staggered manner. An operation cord 23 is wound between the first and second claw members 103a and 103b.

  Further, as shown in FIG. 5, a protrusion 104 that protrudes on the opposite side of the cover 83 is formed on the upper portion of the first claw member 103 a that forms a row far from the cover 83. An inclined surface 104 a is formed on the inner surface of each protrusion 104 so as to be separated from the rotation center axis of the drive pulley 101 toward the tip. And the space part which consists of the inclined surface 104a of each 1st nail | claw member 103a and the side surface on the opposite side to the cover 83 of the drive pulley 101 is frustoconical shape corresponding to the external shape of the connection member 56 provided in the head box 11 side. Make. That is, the connecting member 56 provided on the head box 11 side can be fitted to the side surface portion of the drive pulley 101 on the head box side. Each inclined surface 104 a constitutes a draft taper surface on the drive pulley 101 side corresponding to the draft taper surface 57 of the connecting member 56.

  Further, four pin engaging recesses 105 are formed on the inner peripheral surface of the drive pulley 101. Each pin engaging recess 105 extends in the direction of the rotation center axis of the drive pulley 101 and is arranged at equal intervals around the rotation center axis.

<Power transmission member>
As shown in FIG. 4, in the power transmission member 102, a cylindrical magnet housing portion 106 is recessed at the center of the side surface on the cover 83 side, and an annular spring is provided around the magnet housing portion 106. A housing portion 107 is formed. Further, four through holes 108 corresponding to the pin engaging recesses 105 of the drive pulley 101 are formed in the outer peripheral wall of the power transmission member 102. The through holes 108 are arranged at equal intervals around the axis of the power transmission member 102. Further, on the outer peripheral wall of the power transmission member 102, a spring engaging portion 109 is cut out at a side edge portion on the cover 83 side. The spring engaging portion 109 is formed at a predetermined angle (obtuse angle) around the axis of the power transmission member 102. The power transmission member 102 is fitted into the drive pulley 101 such that the four through holes 108 coincide with the four pin engaging recesses 105 on the drive pulley 101 side.

  In the magnet housing portion 106 of the power transmission member 102, a cylindrical permanent magnet 110 and a disk-shaped yoke 111 made of a magnetic material such as iron are housed and fixed. In addition, as shown in FIG. 6A, in the spring accommodating portion 107 of the power transmission member 102, four cylindrical pins 112 are accommodated corresponding to the through holes 108, respectively. The pin 112 is made of, for example, a stainless steel material, and a small diameter portion 112a is formed on the center outer peripheral surface thereof. The pins 112 can be engaged with the pin engaging recesses 105 on the drive pulley 101 side through the through holes 108.

  An annular back spring 113 is accommodated inside each pin 112 inside the spring accommodating portion 107. The back spring 113 is engaged with the small diameter portion 112 a of each pin 112. Thereby, the engagement state of the back spring 113 and each pin 112 is suitably maintained. Further, the outer diameter of the back spring 113 is set to be slightly larger than the inner diameter of the inner peripheral surface on the large diameter side of the spring accommodating portion 107. For this reason, the back spring 113 is held in a state in which both ends thereof are slightly reduced in diameter by being engaged with the spring engaging portion 109. Each pin 112 is biased in the radial direction of the drive pulley 101 by the elastic force of the back spring 113.

  Normally, as shown in FIG. 6A, each pin 112 is held in a state of being engaged with the pin engaging recess 105 on the drive pulley 101 side through each through hole 108. Precisely, each pin 112 engages with the pin engaging recess 105 with a part of the pin 112 remaining inside the through hole 108. For this reason, when a predetermined rotational operation force is applied to the drive pulley 101 through the operation of the operation cord 23, the drive pulley 101 and the power transmission member 102 rotate integrally. On the other hand, when an excessive rotational operation force exceeding the elastic force of the back spring 113 is applied to the drive pulley 101, each pin 112 is connected to the back spring 113 as shown in FIG. It is displaced toward the center of the power transmission member 102 against the elastic force. The engagement between each pin 112 and the pin engagement recess 105 of the drive pulley 101 is released, so that the drive pulley 101 rotates relative to the power transmission member 102. That is, as shown in FIG. 6C, the pin engaging recess 105 is rotationally displaced relative to the pin 112, and the drive pulley 101 rotates so-called with respect to the power transmission member 102. In this manner, each pin 112 functions as a clutch mechanism that transmits or blocks power between the drive pulley 101 and the power transmission member 102.

  On the other hand, on the side surface of the power transmission member 102 opposite to the cover 83, a large number of convex teeth 114 corresponding to the concave teeth 59 formed on the coupling member 56 on the head box 11 side are annularly formed. The external shape of these convex teeth 114 is a rectangular parallelepiped shape, and two pairs (four in total) located on opposite sides thereof are inclined so as to approach each other toward the tip of the convex teeth 114. A draft surface 114a is formed. Each convex tooth 114 is engaged with each concave tooth 59 of the connecting member 56.

<Stopper>
A stopper handle 89 is provided on the upper side wall of the head box 11 facing each other so as to be slidable along the side wall. As shown in FIGS. 7A and 7B, the stopper handle 89 is connected to the upper portion of the side wall of the head box 11 via a fitting portion 121 having a U-shaped cross section that is fitted in a retaining state. 11 is supported at the top. An extending portion 122 extending in one direction along the outer surface of the head box 11 is formed at the lower portion of the side wall located outside the head box 11 of the two side walls facing each other in the fitting portion 121. . In addition, on the outer surface of the side wall located outside the head box 11 of the fitting portion 121, a contact portion 123 orthogonal to the side wall is formed on the side edge portion opposite to the extending direction of the extending portion 122. ing. A lower surface of the contact portion 123 is formed as a contact surface 123 a that is a curved surface corresponding to the outer surface shape of the upper portion of the pulley case 81.

  The stopper handle 89 is located between an unlock position (engaged release position) indicated by a two-dot chain line in FIGS. 7A and 7B and a lock position (engaged position) indicated by a solid line in FIG. Displace the slide.

  As shown in FIG. 8 (a), the unlocking position is such that the stopper handle 89 is positioned laterally with respect to the operating device 21, and the extending portion 122 is against the stopper member 88 on the pulley case 81 side. This is the position where the disengaged state is reached. When the stopper handle 89 is held in the unlocked position, the extended portion 122 is disengaged from the stopper member 88, so that the pulley case 81 is displaced downward and the head on the upper side thereof. Displacement in a direction away from the box 11 is allowed.

  As shown in FIG. 8B, the lock position is a position where the stopper handle 89 is positioned inside the operating device 21 and the extended portion 122 is engaged with the stopper member 88 on the pulley case 81 side from the inside. It is. When the stopper handle 89 is held at the lock position, the extended portion 122 engages with the stopper member 88, so that the pulley case 81 is displaced downward and separated from the head box 11 on the upper side. Displacement in the direction is restricted.

  It should be noted that the displacement of the stopper handle 89 from the unlocked position to the locked position is as shown in FIG. 7A by a solid line. The contact surface 123a) is regulated by contacting the upper outer surface of the pulley case 81.

<Aspect of case attachment>
Next, an aspect of mounting the operating device configured as described above to the head box will be described. Here, it is assumed that the operating device 21 is attached to the front side of the head box 11.

  The operating device 21 is attached to the head box 11 as follows. That is, as shown in FIG. 9A, the hook 87 provided at the lower portion of the case main body 82 is provided at the upper portion of the case main body 82 while engaging the protrusion 11a of the head box 11 from below. The stopper member 88 is moved closer to the recess 11c formed in the corresponding portion on the head box 11 side. Then, the pulley case 81 is held in a state of being fixed to the head box 11 by an attractive force acting between the permanent magnet 110 built in the pulley case 81 and the magnet receiving member 71 on the head box 11 side. At this time, each convex tooth 114 on the power transmission member 102 side and each concave tooth 59 on the connecting member 56 side are held in an engaged state. Therefore, the rotational force of the power transmission member 102 is transmitted to the connecting member 56 through the engagement relationship between the convex teeth 114 and the concave teeth 59.

<Left / Right change>
In horizontal blinds, it is assumed that there are many cases where it is desired to change the operation type to the left or right depending on the installation location or the like. In this case, the operating device 21 may be detached from the transmission mechanism 34 or the transmission mechanism 35 provided on the opposite sides of the head box 11 and the removed operating device 21 may be attached to the transmission mechanism 35 or the transmission mechanism 34. . Since the operating device 21 is only fixed to the head box 11 side using the magnetic force of the permanent magnet 110, the operating device 21 can be easily attached and detached without using any tools or the like. it can.

  In this example, as described above, the case where the operation device 21 is connected to the transmission mechanism 34 is the right operation type, and the case where the operation device 21 is connected to the transmission mechanism 35 is the left operation type. For example, when the type is changed from the right operation type to the left operation type, the following is performed. That is, as shown in FIGS. 10A and 10B, the operating device 21 attached to the transmission mechanism 34 is removed, and the removed operating device 21 is positioned on the opposite side of the transmission mechanism 34. Attach to. If the front and back of the horizontal blind including the head box 11 are reversed after the operation device 21 is replaced, the left / right reversal of the operation type of the blind is completed. When removing the operating device 21, for example, the upper portion of the operating device 21 is gripped and pulled in a direction parallel to the inclined surface 104 a of the drive pulley 101, so that the operating device 21 can be easily removed from the head box 11. Can be removed.

<Operation of operation device>
Next, the operation of the operating device configured as described above will be described. Here, it is assumed that the operating device 21 is connected to the transmission mechanism 34 on the front side.

  In the operation of the operation cord 23, more precisely, in the loop-shaped operation cord 23 suspended from the operation device 21, when one part corresponding to the lifting / lowering operation of the blind is pulled downward, the operation device 21 side The drive pulley 101, the power transmission member 102, the coupling member 56 on the head box 11 side, and the input bevel gear 32 rotate integrally. Then, the output bevel gear 31 and eventually the drive shaft 15 are rotated based on the rotation of the input bevel gear 32 so that each slat 13 is moved up and down. Incidentally, in the operation cord 23 suspended from the operation device 21, when the other side portion that is not used when the slats 13 are moved up and down is pulled downward, the tilting device provided inside the head box 11 is used. Through operation, each slat 13 is rotated up and down. That is, the inclination angle in the vertical direction of each slat 13 is changed.

  During this normal blind operation, the operation cord 23 may be operated while being pulled in a direction along the rotation center axis of the pulley 100, for example, in a blind operator side (a direction away from the head box 11). is there. At this time, the hook portion 87 of the pulley case 81 is hooked on the protrusion 11a of the head box 11, whereby the displacement of the pulley case 81 toward the operator is restricted. Therefore, the unintentional drop-off of the pulley case 81 and the pulley 100 accommodated therein during the normal operation from the head box 11 is suppressed.

<When overload is applied to the drive pulley>
Here, it is assumed that an excessive operation torque acts on the pulley 100 when the slats 13 are moved up and down. For example, when the operation cord 23 is further pulled in a state where the slat 13 is at the lower limit position (down position) or the upper limit position (up position), an excessive rotational load acts on the pulley 100. There is a concern that the pulley 100 may be damaged. Moreover, there is a concern that the operating device 21 may be detached from the head box 11. Such a concern is eliminated through the following protection operation in the controller device 21 of the present embodiment. That is, when the pulley 100 (more precisely, the driving pulley 101 around which the operation cord 23 is wound) is overloaded, that is, a force exceeding the engaging force between each pin 112 and each pin engaging recess 105 of the driving pulley 101 is applied. Each pin 112 is displaced inward of the power transmission member 102 against the elastic force of the back spring 113, and the back spring 113 is contracted in diameter (see FIG. 6B). As a result, the engagement state between each pin 112 and the drive pulley 101 is released, and the power transmission between the drive pulley 101 and the power transmission member 102 is interrupted. Therefore, only the driving pulley 101 around which the operation cord 23 is wound rotates, and this rotational force is not transmitted to the power transmission member 102 and, consequently, the connection member 56 on the head box 11 side. As described above, when an overload (excessive rotational operation force) is applied to the drive pulley 101, the drive pulley 101 is idled, so that the drive pulley 101, and hence the power transmission member 102 and the transmission mechanism 34 or the transmission. It is possible to prevent an excessive rotational load from being applied to a connection portion with the mechanism 34 or the like. Further, the operating device 21 is not unintentionally detached from the head box 11.

<When both ends are pulled simultaneously>
Further, as described above, the operation cord 23 is hung down from the operation device 21 in a loop shape. Due to this configuration, the following problems are assumed to occur. That is, the blind provided with the operation device 21 is used, for example, as a sunshade or a blindfold by being attached to a window. For example, when an indoor person walks in the vicinity of the blind, the loop portion of the operation code 23 is used. May entangle with a part of the human body such as hands and arms. In this case, as shown in FIG. 9B, both sides of the operation cord 23 wound around the pulley 100 are simultaneously pulled downward or the like, so that the operation cord 23 is pulled with respect to the pulley 100. It is conceivable that an excessive external force is applied. Depending on the magnitude of the external force applied to the pulley 100, there is a concern that the pulley 100, and consequently the transmission mechanism 34 or the transmission mechanism 35 on the head box 11 side to which the pulley 100 is coupled, may be damaged.

  Such a concern is eliminated through the following protection operation in the controller device 21 of the present embodiment. That is, when an external force exceeding the attractive force due to the magnetic force acts on the pulley 100 through the operation cord 23, for example, the pulley 100 is detached from the head box 11 together with the pulley case 81. That is, as indicated by a two-dot chain line in FIG. 9A, the entire operation device 21 is detached downward from the head box 11. As a result, an excessive force is not applied to the pulley 100, and hence the transmission mechanisms 34 and 35 to which the pulley 100 is connected, and problems such as breakage of these are avoided. It should be noted that the magnitude of the external force required to disengage the pulley 100 from the head box 11 can be easily set through adjustment of the attractive force (magnetic force) by the permanent magnet 110.

  Here, in a state where the operating device 21 is attached to the head box 11, the coupling member 56 is held in a state where the coupling member 56 is fitted to the side surface portion of the drive pulley 101 on the head box 11 side. The surface is formed with a draft taper surface 57, while each first claw member 103 a on the drive pulley 101 side is formed with an inclined surface 104 a that contacts with the draft taper surface 57. For this reason, as shown in FIG. 9C, when a downward external force is applied to the pulley 100, the inclined surface 104 a of the drive pulley 101 is guided to the taper surface 57 of the connecting member 56. It slides down in a shape.

  Therefore, when the operating device 21 is detached from the head box 11, the drive pulley 101 is not caught by the connecting member 56. The draft surface 114 a is also formed on each convex tooth 114 on the power transmission member 102 side, while the inner shape of each concave tooth 59 on the connecting member 56 side corresponds to the outer shape of each convex tooth 114. Is formed. Therefore, when the operating device 21 is detached from the head box 11, the convex teeth 114 are not caught by the concave teeth 59. Further, since the latching portion 87 of the pulley case 81 is latched by being extrapolated from below into the ridge 11a or ridge 11b on the head box 11, the downward displacement of the pulley case 81 is allowed. The For this reason, when an external force exceeding the attracting force due to the magnetic force acts downward on the pulley 100 through the loop portion of the operation cord 23, the hook portion 87 of the pulley case 81 and the protrusion on the head box 11 side. The latching with 11a, 11b is easily released. Therefore, when both sides of the operation cord 23 are pulled downward or the like at the same time, the operation device 21 is smoothly detached from the head box 11.

  When the operating device 21 is detached from the head box 11, the blind device can be operated again by attaching the detached operating device 21 to the head box 11. Since the operating device 21 is configured to be connected to the head box 11 using the magnetic force of the permanent magnet 110, the reattachment of the detached operating device 21 to the head box 11 is easy.

  For example, when the blind is installed in a place (such as a nursing home or a hotel) operated by many people, it may be desired to prevent the pulley case 81 from being detached from the head box 11. In such a case, the stopper member 88 may be slid and displaced from the unlock position indicated by the two-dot chain line in FIGS. 7A and 7B to the lock position indicated by the solid line in FIG. Thereby, the pulley case 81 can be prevented from being detached from the head box 11. That is, normally, the lower part of the pulley case 81 is maintained in a state where displacement in a direction away from the head box 11 is restricted. In this state, if the stopper member 88 is engaged with the upper portion of the pulley case 81 to restrict the displacement of the upper portion of the pulley case 81 in the separating direction with respect to the head box 11, the pulley case 81 has two upper and lower portions. In this case, the displacement in the separation direction with respect to the head box 11 is restricted. Therefore, the pulley case 81 does not come off the head box 11 even when an external force exceeding the attracting force due to the magnetic force acts on the pulley 100 downward. Thus, the effective state and the invalid state of the blind protection function can be easily switched through the operation of the stopper member 88.

<Effect of Embodiment>
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The pulley 100 is detachably connected to the connecting member 56 of the transmission mechanism 34, 35 on the side of the head box 11 at the side, and the pulley 100 and the connecting member 56 are attracted to each other. By applying a matching magnetic force, the connected state of the pulley 100 to the connecting member 56 is maintained. For this reason, when both sides of the operation cord 23 suspended from the operation device 21 are simultaneously pulled downward, the pulley 100 around which the operation cord 23 is wound is detached from the head box 11 together with the pulley case 81. The magnetic force does not change greatly even if the operating device 21 is repeatedly removed. For this reason, the magnitude | size of the external force required in order to remove the operating device 21 can be stably maintained over a long period of time. As a result, it can suppress that the operating device 21 unintentionally remove | deviates from the head box 11. FIG. Unlike the case where the pulley case 81 is urged downward through the operation cord 23 to remove the pulley case 81 from the head box 11, no special handling of the operation cord 23 is required. This is because it is not necessary to hook the operation cord 23 on the pulley case 81 in order to bias the pulley case 81 downward.

  In addition, an excessive force is not applied to the pulley 100, and hence the transmission mechanisms 34 and 35 to which the pulley 100 is connected, and the breakage of these can be avoided. In addition, it is possible to prevent the occurrence of a problem due to the neck being caught in the loop portion of the operation code 23.

  (2) By providing the permanent magnet 110 on the pulley 100 side and the magnet receiving member 71 made of a magnetic material on the connecting member 56 side, a magnetic force attracting each other acts between the pulley 100 and the connecting member 56. I made it. For this reason, since it is only necessary to provide a magnet and a magnetic body attracted to the pulley 100 and the connecting member side of the transmission mechanism, the pulley can be attracted to the head box side without complicating the configuration.

  In addition, it is possible to easily set the magnitude of the external force required to remove the pulley from the head box side through adjustment of the attractive force (magnetic force) by the magnet. Further, by using the permanent magnet 110 as a means for fixing the pulley 100 to the head box 11, even if the operating device 21 is repeatedly detached from the head box 11, the attractive force on the head box 11 side changes greatly. There is nothing. That is, the load at which the pulley 100 is detached from the head box 11 is constant and uniform. Therefore, when the same external force is applied to the operation cord 23, the situation that the pulley 100 may or may not come off cannot occur, and the reliability of the protection operation of the operation device 21 is ensured. .

  (3) The pulley 100 is engaged and connected so as to be integrally rotatable through an opening 84 formed in the pulley case 81 so as to be fitted on the connecting member 56. The outer peripheral surface of the connecting member 56 is formed with a punching taper surface 57 that is reduced in diameter as it is separated from the head box 11, while a pulling taper is formed on a side portion of the pulley 100 to which the connecting member 56 is fitted. A plurality of inclined surfaces 104a are formed on each first claw member 103a as a pulling taper surface on the pulley 100 side corresponding to the surface 57. For this reason, when an external force (particularly, an external force downward) exceeding the adsorption force due to the magnetic force acts on the pulley 100 via the operation cord 23, the pulley 100 is smoothly caught without being caught by the connecting member 56. Deviate from.

  (4) A draft surface 114 a is formed on each convex tooth 114 provided on the side of the pulley 100. Further, the inner shape of each of the concave teeth 59 on the connecting member 56 side with which the convex teeth 114 engage was formed corresponding to the outer shape of the convex teeth 114. For this reason, when an external force exceeding the attracting force due to the magnetic force acts on the lower side of the pulley 100 or the like via the operation cord 23, each of the convex teeth 114 of the pulley 100 has each concave tooth 59 on the connecting member 56 side. The head box 11 can be smoothly removed without being caught by the head box 11.

  (5) At the lower part of the side surface of the pulley case 81 on the head box 11 side, a hooking portion 87 having a U-shaped cross section that opens upward is provided, and the hooking portion 87 is hooked provided at the lower portion of the head box 11. The protrusions 11a and 11b as parts are extrapolated from below and are hooked. For this reason, even when the operation cord 23 is operated in a state where the operation cord 23 is pulled obliquely toward the operator side of the blind, for example, the pulley case 81 is obtained by the protrusions 11a and 11b being hooked on the hook portion 87. Displacement to the operator side is restricted. Therefore, unintentional dropping of the pulley case 81 during normal operation is suppressed.

  In addition, since the latching | locking part 87 of the pulley case 81 is latched by extrapolating from the downward direction on the protrusion 11a, 11b by the side of the head box 11, the downward displacement of the said pulley case 81 is accept | permitted. For this reason, when an external force exceeding the attracting force due to the magnetic force acts downward on the pulley via the operation cord 23, the hook portion 87 of the pulley case 81 and the protrusions 11a and 11b on the head box 11 side The latch is easily released. That is, during normal use, the pulley case 81 is unlikely to be detached from the head box 11, and when both sides of the operation cord 23 are pulled downward simultaneously, the pulley case 81 is smoothly detached from the head box 11. Therefore, during normal use, the pulley case 81 does not frequently come off from the head box 11, so that the operability of the blind is ensured. On the other hand, when a large external force is applied to the pulley 100 and there is a possibility of damage or the like, the pulley 100 is smoothly detached from the head box 11 to protect the pulley 100 or the like.

  (6) A stopper member 88 having an L-shaped cross section is formed on the upper side surface of the pulley case 81 on the head box 11 side. The upper edge of the head box 11 includes an engagement position that engages with the stopper member 88 and restricts displacement in a direction away from the head box 11, and the stopper member 88. A stopper handle 89 is provided that is displaced between the release position where the engagement is released. For this reason, through the operation of the stopper handle 89, the valid state and the invalid state of the blind protection function can be easily switched. Therefore, even when the loop portion of the operation cord 23 is pulled downward, it is possible to easily cope with the case where it is desired not to remove the pulley case 81 from the head box 11.

  (7) The pulley 100 is fitted to the drive pulley 101 around which the operation cord 23 is wound, and the drive pulley 101 is slidably rotatable, and the transmission mechanism 34, through the opening of the drive pulley 101, And a power transmission member 102 engaged and connected to the 35 connecting members 56. And the clutch mechanism which interrupts the power transmission between these drive pulleys 101 and the power transmission members 102 was provided.

  The clutch mechanism includes a plurality of pins 112 arranged in an annular shape inside the power transmission member 102, and is provided on the inner peripheral side of each pin 112 so that each pin 112 is always in the radial direction of the power transmission member 102. And a back spring 113 for energizing all at once. Normally, each pin 112 is engaged with each pin engaging recess 105 formed on the inner peripheral surface of the drive pulley 101 while leaving a part thereof on the power transmission member 102 side by the elastic force of the back spring 113. Retained. That is, the drive pulley 101 and the power transmission member 102 can rotate together. For example, when the operation cord 23 is further operated in a state where the slat 13 is at the lower limit position or the upper limit position, the force exceeding the engagement force between each pin 112 and each pin engagement recess 105 of the drive pulley 101 is a pulley. When acting on 100, each pin 112 is displaced inward of the power transmission member 102 against the elastic force of the back spring 113. As a result, the engagement state between each pin 112 and the drive pulley 101 is released, and the power transmission between the drive pulley 101 and the power transmission member 102 is cut off. For this reason, for example, when operated beyond the lower limit position and the upper limit position of each slat 13, only the drive pulley 101 rotates. Therefore, an excessive rotational load is not applied to the connecting portion between the pulley 100 and the transmission mechanisms 34 and 35, and the operation device 21 is protected. At this time, the operating device 21 does not come off the head box 11. As described above, the operating device 21 is detached from the head box 11 only when a downward external force or the like is applied to the loop portion of the operation cord 23.

  (8) The transmission mechanisms 34 and 35 are provided on the front and back of the head box 11, and the operating device 21 is connected to the head box 11 side using the attractive force of the permanent magnet 110 with respect to the connecting member 56. For this reason, it is very easy to attach and detach the operating device 21. Further, by attaching the operating device 21 to any one of the transmission mechanisms 34 and 35, the operating type of the blind can be easily changed left and right.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The present embodiment is basically configured similarly to the first embodiment, but differs from the first embodiment in the configuration of the pulley around which the operation cord is wound. Therefore, the same reference numerals are given to the same member configurations as those in the first embodiment, and the duplicate description thereof is omitted.

  As shown in FIG. 11, a pulley 200 rotatably accommodated in a pulley case 81 includes a drive pulley 201 around which an operation cord 23 is wound, a power transmission member 202 fitted therein, and a permanent. A magnet holding member 203 in which the magnet 110 and the yoke 111 are accommodated, and a wave washer 204 interposed between the magnet holding member 203 and the power transmission member 202 are provided. The drive pulley 201, the power transmission member 202, and the magnet holding member 203 are all made of a synthetic resin material.

  As shown in FIGS. 13 and 14, a plurality of engaging recesses 211 are formed on the inner peripheral surface of the drive pulley 201 at predetermined intervals around the axis of the drive pulley 201. Each engaging recess 211 is formed so as to open to the cover 83 side.

  The power transmission member 202 is formed in a bottomed cylindrical shape with one side opened. A circular hole 221 is formed at the center of the bottom surface of the power transmission member 202, and a number of convex teeth 114 are annularly arranged around the hole 221. Further, the outer shape of the power transmission member 202 corresponds to the inner shape of the drive pulley 201. That is, on the outer peripheral surface of the power transmission member 202, engagement convex portions 222 corresponding to the respective engagement concave portions 211 on the drive pulley 201 side are formed at predetermined intervals around the axis of the power transmission member 202. Furthermore, four engaging recesses 223 are formed around the axis of the power transmission member 202 at predetermined intervals on the inner peripheral surface of the power transmission member 202. Each engaging recess 223 is open to the cover 83 side. As shown in FIG. 12, the power transmission member 202 is configured so that the engagement protrusions 222 on the outer peripheral surface thereof are aligned with the engagement recesses 211 of the drive pulley 201. It is fitted from. As shown in FIG. 11, the engagement protrusions 222 come into contact with the non-open portions of the engagement recesses 223 opposite to the cover 83, so that the power transmission member 202 is inserted into the drive pulley 201. Displacement is regulated. In this state, the bottom surface (side surface opposite to the cover 83) of the power transmission member 202 is exposed to the outside through the opening on the driving pulley 201 opposite to the cover 83. Then, the power transmission member 202 rotates integrally with the drive pulley 201 through the engagement relationship between each engagement protrusion 222 and each engagement recess 211. The power transmission member 202 is slidable in a direction along the axis of the drive pulley 201 by guiding each engagement convex portion 222 to each engagement concave portion 211.

  As shown in FIG.13 and FIG.14, the magnet holding member 203 is formed in the bottomed cylindrical shape which one side opened. The outer diameter of the magnet holding member 203 is substantially the same as the inner diameter of the hole 221 of the power transmission member 202. An annular flange 231 is formed on the opening edge of the magnet holding member 203. Further, on the outer peripheral surface on the opening side of the magnet holding member 203, four engagement convex portions 232 corresponding to the respective engagement concave portions 223 on the power transmission member 202 side are formed including the flange portions 231. Each engagement convex portion 232 is provided at predetermined intervals in the circumferential direction of the power transmission member 202. A permanent magnet 110 and a yoke 111 are accommodated inside the magnet holding member 203. The magnet holding member 203 is opposite to the convex teeth 114 of the power transmission member 202 in a state in which the engagement convex portions 232 on the outer peripheral surface thereof are aligned with the engagement concave portions 223 on the power transmission member 202 side. It is fitted from the opening. The magnet holding member 203 rotates integrally with the power transmission member 202 through the engagement relationship between the engagement protrusions 232 and the engagement recesses 223. That is, the magnet holding member 203 in which the permanent magnet 110 and the yoke 111 are accommodated, the power transmission member 202, and the drive pulley 201 rotate integrally.

  In addition, the length of the magnet holding member 203 in the axial direction in each engagement convex portion 232 of the magnet holding member 203 is the length along the axial direction of the power transmission member 202 in each engagement concave portion 223 on the power transmission member 202 side. It is set smaller than this. In general, as shown in FIG. 11, between each engagement convex portion 232 of the magnet holding member 203 and an inner surface facing each engagement convex portion 232 in each engagement concave portion 223 of the power transmission member 202. A predetermined gap D is formed. Therefore, when a predetermined external force is applied to the power transmission member 202 toward the cover 83, the power transmission member 202 slides toward the cover 83 against the elastic force of the wave washer 204. To do. The displacement of the power transmission member 202 toward the cover 83 is restricted by the inner surface of each engagement recess 223 of the power transmission member 202 coming into contact with each engagement projection 232 on the magnet holding member 203 side. As shown in FIG. 11, the magnet holding member 203 is displaced to the cover 83 side by abutting the pressing portion 233 provided on the inner surface of the cover 83 via the yoke 111 and the permanent magnet 110. Is regulated.

  The manner of mounting the operating device 21 configured in this way to the head box 11 is similar to the first embodiment in that the hook portion 87 at the bottom of the case body 82 is connected to the ridge 11a at the bottom of the head box 11. The stopper member 88 at the upper part of the case main body 82 is brought close to the recess 11c on the head box 11 side while being engaged with 11b from below. Then, the pulley case 81 is held in a state of being fixed to the head box 11 by an attractive force acting between the permanent magnet 110 and the magnet receiving member 71. Further, the left / right change of the blind operation direction can be performed in the same manner as in the first embodiment. That is, it is only necessary to replace the operating device 21 between the transmission mechanisms 34 and 35.

<Operation of operation device>
Next, the operation of the operating device configured as described above will be described. Here, it is assumed that the operating device 21 is connected to the transmission mechanism 34.

  When the slats 13 are moved up and down, as in the first embodiment, in the loop-shaped operation cord 23 suspended from the operating device 21, the one side portion corresponding to the lifting operation is moved downward. Just pull it to. Then, the drive pulley 201, the power transmission member 202, and the magnet holding member 203 on the operating device 21 side, the connecting member 56 on the head box 11 side, and the input bevel gear 32 rotate integrally. Then, the output bevel gear 31 and eventually the drive shaft 15 are rotated based on the rotation of the input bevel gear 32 so that each slat 13 is moved up and down. Further, when the inclination angle in the vertical direction of each slat 13 is changed, as in the first embodiment, this is also used on the other side of the operation cord 23 that is not used when the slats 13 are moved up and down. What is necessary is just to pull a part below. In this normal blind operation, even when the operation cord 23 is operated in a state of being pulled toward the blind operator, for example, the hooking portion 87 of the pulley case 81 is attached to the protrusion 11a of the head box 11. The fact that the pulley case 81 is prevented from unintentionally falling off from the head box 11 by being hooked is the same as in the first embodiment.

<When overload is applied to the drive pulley>
Here, for example, when the operation cord 23 is further pulled in a state where the slat 13 is at the lower limit position (the position where it is fully lowered) or the upper limit position (the position where it is fully raised), an excessive rotational load is applied to the pulley 200. As described above, there is a concern that the pulley 200 may be damaged due to the action. Similarly, there is concern about the operating device 21 coming off the head box 11. Such a concern is eliminated in the operating device 21 of the present embodiment by the power transmission member 202 being displaced toward the cover against the elastic force of the wave washer 204. That is, as described above, each convex tooth 114 of the power transmission member 202 is formed with a draft angle surface 114a, and the inner peripheral surface of each concave tooth 59 of the connecting member 56 with which these teeth are engaged is also provided. A draft surface 59a corresponding to the slope surface 114a is formed. For this reason, for example, when a rotational force is applied to the power transmission member 202 engaged with the slat 13 in a state where the rotation of the connecting member 56 is restricted by reaching the upper limit position or the lower limit position, The rotational force of the power transmission member 202 is applied to the cover 83 side through the engagement between the draft surface 59a of each concave tooth 59 of the connecting member 56 and the draft surface 114a of each convex tooth 114 of the power transmission member 202. Converted into force. As the power transmission member 202 rotates, each convex tooth 114 rotates relative to the connecting member 56 in such a way as to get over each concave tooth 59 on the connecting member 56 side. That is, as each convex tooth 114 gets over each concave tooth 59, the state shown in FIG. 15A that engages with the concave tooth 59 and the concave shape shown in FIG. Repeated. Therefore, only the driving pulley 201 around which the operation cord 23 is wound rotates, and this rotational force is not transmitted to the connecting member 56 on the head box 11 side. As described above, when an overload (excessive rotational operation force) is applied to the drive pulley 201, the drive pulley 201 is idled, thereby connecting the drive pulley 201 and the transmission mechanism 34 or the transmission mechanism 35. For example, an excessive rotational load is suppressed. Further, the operating device 21 is not unintentionally detached from the head box 11.

  As can be seen from the foregoing, the power transmission member 202 that slides in the axial direction relative to the drive pulley 101 and the wave washer 204 that constantly urges the power transmission member 202 toward the connection member 56 are connected to the drive pulley 101. It functions as a clutch mechanism that transmits or cuts power to and from the member 56.

<When both ends of the operation cord are pulled simultaneously>
In addition, as described above, for example, when a person indoors walks in the vicinity of the blind, the loop portion of the operation code 23 is entangled with a part of the human body such as a hand or an arm, and both sides of the operation code 23 are connected. Are simultaneously pulled downward or the like. Then, when an external force exceeding the attractive force due to the magnetic force acts on the pulley 200 downward, for example, via the operation cord 23, the pulley 200 is detached from the head box 11 together with the pulley case 81. As a result, an excessive force is not applied to the pulley 200, and hence the transmission mechanisms 34 and 35 to which the pulley 200 is coupled, and problems such as breakage of the pulley 200 are avoided. In order to prevent the pulley case 81 from being detached from the head box 11, the stopper handle 89 is indicated by a two-dot chain line in FIGS. 7A and 7B, as in the first embodiment. What is necessary is just to slide-displace from the unlock position to the lock position shown with the continuous line in the same figure.

<Effect of Embodiment>
Therefore, according to the present embodiment, in addition to the effects (1) to (6) of the first embodiment, the following effects can be further obtained.

  In the drive pulley 201, a power transmission member 202 engaged and connected to the connection member 56 on the transmission mechanisms 34 and 35 side is provided so as to be able to rotate integrally and to be displaced in a direction along the axis of the drive pulley 201. Further, a wave washer 204 that constantly urges the power transmission member 202 toward the connecting member 56 is disposed between the power transmission member 202 and the magnet holding member 203. The connected state between the power transmission member 202 and the connecting member 56 is maintained by the elastic force of the wave washer 204.

  Here, a draft angle surface 114a is formed on each convex tooth 114 of the power transmission member 202, and an inner peripheral surface of each concave tooth 59 of the connecting member 56 with which these teeth engage is also formed on the draft angle surface 114a. A corresponding draft angle surface 59a is formed. For this reason, a part of the rotational force of the power transmission member 202 acts on the power transmission member 202 as a reaction force in a direction away from the connecting member 56. The reaction force increases as the rotational force of the power transmission member 202 increases. For example, when the operation cord 23 is further operated while the slat 13 is at the lower limit position or the upper limit position, and the reaction force becomes larger than the elastic force of the wave washer 204, the power transmission member 202 is The wave washer 204 is displaced in a direction away from the connecting member 56 against the elastic force of the wave washer 204. As a result, the power transmission between the power transmission member 202 and the connecting member 56 is cut off. Therefore, an excessive rotational load is not applied to the connecting portion between the pulley 200 and the transmission mechanisms 34 and 35, and the operation device 21 is protected.

<Other embodiments>
The first and second embodiments may be modified as follows.
In the first and second embodiments, the magnet receiving member 71 and the input shafts 32a and 33a of the input bevel gears 32 and 33 are connected together by the screw 75 so as to be integrally rotatable. Also good. For example, as shown in FIG. 16, two connecting projections 241 having a fan-shaped cross section with a central angle of, for example, 90 ° are formed opposite to each other at the distal end portion of the insertion portion 72 in the magnet receiving member 71. On the other hand, the input shafts 32a and 33a of the input bevel gears 32 and 33 are formed with two fitting recesses 242 having a fan-shaped cross section into which the connecting projection 241 on the magnet receiving member 71 side is fitted. The relative rotation of the magnet receiving member 71 with respect to the input bevel gears 32 and 33 is restricted by fitting the coupling protrusions 241 into the fitting recesses 242. In this way, the rotational force of the magnet receiving member 71 and thus the connecting member 56 can be reliably transmitted to the input bevel gears 32 and 33 through the engagement between the connecting projection 241 and the fitting recess 242.

  In the first and second embodiments, the clutch mechanism is provided in the operating device 21 that is detachably provided on the head box 11 side by using the magnetic force of the permanent magnet 110, but the clutch mechanism is provided in the head box 11. It is also possible to apply to a fixed operating device. Also in this case, it is possible to prevent an excessive rotational force from being applied to the pulley 100 or the like.

  In the first and second embodiments, the permanent magnet 110 is provided on the pulley 100 side, but may be provided on the head box 11 side. In this case, a counterpart member to which the permanent magnet 110 is attracted is provided on the pulley 100 side.

  In the first and second embodiments, the convex teeth 114 are provided on the pulley 100 side and the concave teeth 59 are provided on the connecting member 56 side. However, the convex teeth 114 are provided on the connecting member 56 side and the concave teeth 59 are provided on the connecting member 56 side. You may provide in the pulley 100 side. Even in this case, power can be transmitted between the pulley 100 and the connecting member 56 through the engagement of the convex teeth 114 and the concave teeth 59.

  In the first and second embodiments, the shape of the hook portion 87 on the pulley case 81 side may be changed as appropriate. The displacement of the pulley case 81 toward the front side may be restricted while allowing the pulley case 81 to fall.

  In the first and second embodiments, the present invention has been embodied as a so-called horizontal blind operating device. However, the general operation of the blind, such as a roll screen and a pleat screen, which moves up and down the shielding material through the operation of the operation code. It can be applied as a device.

  In the first and second embodiments, the pulley case 81 can be omitted.

The front view of a horizontal blind. The schematic plan view which shows the structure of a gear box. FIG. 1 is a sectional view taken along line 1-1 of FIG. The disassembled perspective view of the operating device of 1st Embodiment. The disassembled perspective view of an operating device similarly. (A) is a front view of the operating device with the cover removed in a normal state, (b) is a front view of the operating device showing an excessive rotational force applied to the drive pulley, and (c). These are front views of the operating device which shows relative rotation with respect to the power transmission member of a drive pulley. (A), (b) is a perspective view which shows the lock position and unlock position of a stopper handle. (A), (b) is a rear view of the operating device showing the locked position and unlocked position of the stopper handle. (A) is a side cross-sectional view showing a manner in which the operating device is attached to the head box or a manner in which the operating device is detached from the head box, and FIG. FIG. 4C is a cross-sectional side view of the main part showing the relationship between the inclined surface of the drive pulley and the pulling taper surface of the connecting member when the operating device falls off, and FIG. 4D is the power when the operating device falls off. The principal part sectional side view which shows the relationship between the convex tooth of a transmission member, and the concave tooth of a connection member. (A), (b) is a perspective view which shows the aspect of attachment or detachment of the operating device at the time of changing the blind operating direction right and left. Sectional drawing of the operating device of 2nd Embodiment. The front view of the operating device in the state which similarly removed the cover. The disassembled perspective view of an operating device similarly. The disassembled perspective view of an operating device similarly. (A) is principal part sectional drawing which shows the state which the convex tooth of the power transmission member engaged with the concave tooth of the connection member, (b) is the convex tooth of the power transmission member from the concave tooth of the connection member. The principal part sectional side view which shows the state which isolate | separated. The perspective view which shows the connection structure of the magnet receiving member and input bevel gear of other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Head box, 11a, 11b ... Projection shape (hook part), 13 ... Slat (sunlight shielding material), 15 ... Drive shaft, 23 ... Operation code, 34, 35 ... Transmission mechanism, 21 ... Operation device, 56 ... connecting member, 57 ... draft taper surface, 59 ... concave teeth (concave, concave-convex structure), 59a ... draft angle surface, 81 ... pulley case, 84 ... opening (pulley case), 87 ... latching part, 89 ... stopper Handle, 100, 200 ... pulley, 101, 201 ... drive pulley, 102, 202 ... power transmission member, 104a ... inclined surface (draft angle), 105 ... pin engaging recess (engaging recess) constituting the clutch mechanism, 110 ... permanent magnet, 111 ... magnet receiver (magnetic body), 112 ... pin constituting the clutch mechanism, 113 ... back spring (ring spring) constituting the clutch mechanism, 114 ... convex teeth (convex portion, Convex structure), 114a ... draft surface, 204 ... wave washer (urging member).

Claims (10)

A pulley supported rotatably at one end of the head box is rotated through the operation of an endless operation cord wound around the pulley, and this rotational force is operatively connected to the pulley via a transmission mechanism. In a blind operating device that transmits to a drive shaft that is rotatably supported inside, and raises and lowers a solar shading material that is suspended and supported from the head box through rotation of the drive shaft.
The pulley is detachably connected to a connection member of the transmission mechanism that is exposed to the outside of the head box outside the head box, and a magnetic force attracting each other is applied between the pulley and the connection member. A blind operating device in which a connection state with respect to the connection member is maintained by being attracted to the connection member through an attractive force due to magnetic force. The blind operating device according to claim 1,
A blind operating device in which the pulley is provided with a magnet or a magnetic body, and the connecting member is provided with a magnetic body or a magnet so that a magnetic force attracting each other acts between the pulley and the connecting member. . In the blind operating device according to claim 1 or 2,
The pulley is rotatably housed in a pulley case and is engaged and connected so as to be integrally rotatable through an opening formed in the pulley case so as to be fitted to the connecting member.
The blind operating device in which the pulley and the connecting member are formed on the peripheral surfaces along the rotation direction of each of the pulleys and the connecting members so as to reduce the diameter of the pulley toward the side surface opposite to the connecting member of the pulley. In the operating device of the blind as described in any one of Claims 1-3,
The pulley is connected to the connecting member through a concavo-convex structure formed between the pulley and the connecting member so as to be integrally rotatable. The concavo-convex structure includes a plurality of convex portions and a plurality of concave portions that are fitted to each other. A blind operating device in which drafted surfaces are formed at portions of the recess that engage with each other. In the operating device of the blind according to claim 3 or claim 4,
A hooking portion that opens upward is projected from a lower portion of the side surface of the pulley case on the head box side, and the hooking portion is externally attached to a hooking portion provided at a lower portion of the head box from below. Blind operating device stopped. The blind operating device according to claim 5,
The head box has an engagement position that engages with an upper portion of the pulley case and restricts relative displacement with respect to the head box, and an engagement position with the upper portion of the pulley case is released and relative displacement with respect to the head box. The blind operating device is provided with a stopper handle that is displaced between the release position and the release position. In the operating device of the blind as described in any one of Claims 1-6,
The pulley is provided with a cylindrical driving pulley around which the operation cord is wound and opened at both ends, and is provided in the driving pulley so as to be integrally rotatable and connected to the transmission mechanism through the opening of the driving pulley. A cylindrical power transmission member coupled to the member, and a clutch mechanism that blocks power transmission between the drive pulley and the power transmission member when a predetermined rotational force is applied to the drive pulley. A blind operating device comprising: The blind operating device according to claim 7,
The clutch mechanism is arranged in an annular shape inside the power transmission member and penetrates the peripheral wall of the power transmission member and is formed on the inner peripheral surface of the drive pulley at intervals in the circumferential direction. A plurality of pins engaged with the engaging recesses of
Provided on the inner peripheral side of each of the pins, and constantly energizing each pin in the radial direction of the power transmission member, leaving a part of the pin on the power transmission member side, An operating device for a blind, comprising: a ring spring that is held in an engaged state with an engaging recess. The blind operating device according to claim 7,
The power transmission member is provided so as to be displaceable in a direction along the axis of the drive pulley and engages with the connection member through an uneven structure provided between the drive pulley and the connection member of the transmission mechanism via the opening of the drive pulley. Concatenate,
The plurality of convex portions and the plurality of concave portions constituting the concave-convex structure are provided in an annular shape, and when the power transmission member rotates by forming a draft surface on the engaging portions of the convex portions and the concave portions. Is configured so that a force in a direction in which the engagement between the convex portion and the concave portion is released is applied to the power transmission member as a reaction force from the connecting member,
The clutch mechanism is disposed on the opposite side of the connection member of the power transmission member, and constantly urges the power transmission member toward the connection member to thereby establish a connection state between the power transmission member and the connection member. A blind operating device comprising an urging member for maintenance. In the operating device of the blind as described in any one of Claims 1-9,
The connecting member is a blind operating device provided on both the front surface and the back surface of the head box.

Images