JP2018193753A - Blind shutter device - Google Patents

Abstract

To lift and lower a bottom rail in a well-balanced manner, and prevent slats from protruding.SOLUTION: A blind device (100) includes: a plurality of ladder cords (4) hanging down from a head part (1) with a predetermined interval; a bottom rail (5) provided at lower ends of the plurality of ladder cords; a plurality of slats (6) supported by the ladder cord between the bottom rail and the head portion with a predetermined interval; lifting/lowering cords (71, 76) hanging from the head portion and engaged with the bottom rail for lifting and lowering the bottom rail; and a winding drum (3) on which the lifting/lowering cord is attached for winding up the lifting/lowering cord. The lifting /lowering cords are suspended so as to face each other in a front/rear direction of the slat, and the opposing lifting/lowering cords are attached to the same winding drum in a separate manner.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a blind device in which a plurality of slats are supported in a tiltable manner.

Conventionally, the slats can be tilted by rotating the ladder cord in conjunction with the rotating shaft in the head box fixed to the window frame, and the lifting and lowering cord is operated and wound in conjunction with the rotation of the rotating shaft. There is known a horizontal blind device that can move the bottom rail up and down by performing (see, for example, Patent Document 1).
In the blind device described in Patent Document 1, the lifting / lowering cords are not passed through the center of the slat in the front-rear direction of the slat, but are disposed on the front side and the rear side of the slat. Thereby, it is not necessary to make a hole for passing the lifting / lowering cord through the slat, and the incidence of light from this hole can be prevented. The lifting / lowering cord disposed on the front side of the slat and the lifting / lowering cord disposed on the rear side are respectively suspended from different positions in the longitudinal direction of the head box.
Moreover, the raising / lowering code | cord | chord arrange | positioned by the front side and rear side of a slat is attached to the raising / lowering drum which each differs in a head box.

Japanese Patent No. 5937296

In the blind device described in Patent Literature 1, the bottom rail is provided with lifting cords alternately in the front-rear direction in the longitudinal direction, such as the rear side, the front side, and the rear side. Therefore, the lifting / lowering cord winds up the bottom rail with a non-uniform center of gravity balance in the front-rear direction.
When the bottom rail is rolled up by the lifting / lowering cord, the horizontal balance of the bottom rail is broken and the slats stacked on the bottom rail sometimes collapse to the front side excessively. The appearance of the blind device was damaged by the slats being pushed forward.

  Then, this invention is made | formed in view of the said subject, and it aims at providing the blind apparatus which can raise / lower a bottom rail with sufficient balance and can prevent collapse of a slat.

  In order to achieve the above object, a blind device according to the present invention includes a plurality of ladder cords suspended from a head portion at a predetermined interval, a bottom rail provided at lower ends of the plurality of ladder cords, and the bottom A plurality of slats supported by the ladder cord at a predetermined interval between the rail and the head portion, and ascending and descending that is suspended from the head portion and engaged with the bottom rail to raise and lower the bottom rail And a winding drum to which the lifting / lowering cord is attached and winds the lifting / lowering cord, and the lifting / lowering cord is suspended so as to face each other in the front-rear direction of the slat, These are respectively attached to the same winding drum.

  Moreover, it is preferable that the edge part of the said raising / lowering cord which mutually opposes is attached to the position where the said winding drum differs, respectively.

  Moreover, it is preferable that the said winding drum has a slit extended along a longitudinal direction, and the edge part of the said raising / lowering cord is latched by the said slit.

  Moreover, it is preferable that the winding drum is provided with a slide member that is movable in the axial direction on the outer peripheral surface thereof, and the lifting cord is attached to the slide member.

  Moreover, it is preferable that the said raising / lowering cord is respectively hung down from the several position mutually spaced apart, and the said winding drum is provided between the said raising / lowering cords adjacent.

  The lifting / lowering cord includes a front lifting / lowering cord hanging from the front side of the slat and a rear lifting / lowering cord hanging from the rear side of the slat. Is fixed to the bottom rail, and the other end is preferably attached to the winding drum.

  Moreover, it is preferable that the said raising / lowering cord is one code | cord | chord and it is bridge | crossed over the said bottom rail and it is return | folded.

  Further, the ladder cord is provided with an insertion wheel through which the lifting / lowering cord is inserted, and the lifting / lowering cord is inserted through the insertion wheel except at least a part of the insertion wheel from the head portion. preferable.

  In addition, it is preferable that the head portion includes a rotating member that is rotatable about an axis and that guides the lifting / lowering cord in a hanging direction by linking the lifting / lowering cord on an outer peripheral surface.

  According to the present invention, the bottom rail can be lifted and lowered in a balanced manner to prevent the slats from collapsing.

It is a figure which shows the whole blind apparatus. It is a figure for demonstrating the structure of a winding drum. It is an exploded view for demonstrating the structure of a drum base and a drum main body. It is sectional drawing along the AA line shown in FIG. It is a top view of a slat. It is a figure which shows the raising / lowering cord wound around the winding drum. It is a figure which shows the attachment state of a winding drum and a raising / lowering cord. It is a figure for demonstrating operation of a blind apparatus. It is a figure which shows the modification of an raising / lowering cord. It is a figure for demonstrating the structure of a ring member. It is a figure which shows the state in which the ring member was attached to the drum main body. It is the figure which cut along the longitudinal direction the winding drum in which the ring member was attached.

  A preferred embodiment of the present invention will be described with reference to the drawings. In addition, embodiment shown below is one illustration and can take a various form in the scope of the present invention.

<Configuration of blind device>
FIG. 1 is a schematic view showing the entire blind device. FIG. 2 is a perspective view for explaining the configuration of the winding drum. FIG. 3 is an exploded view for explaining only the configuration of the drum base and the drum body extracted from the winding drum. FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. FIG. 5 is a plan view of the slat. FIG. 6 is a schematic perspective view showing an elevating cord wound around a winding drum. FIG. 7 is a cross-sectional view showing an attachment state of the winding drum and the lifting / lowering cord.

The blind device 100 is fixed to a window frame or the like to ensure visibility from the inside of the room to the outside, to prevent the view from the outside to the room, or to allow light or wind to be taken into the room, It is a cover that prevents light and wind from entering the room.
As shown in FIG. 1, the blind device 100 is provided in the head box 1, a head box (head portion) 1 that is attached to the window frame via the bracket B, an operation portion 2 that operates the blind device 100. The winding drum 3, the ladder cord 4 hanging downward from the head box 1, the bottom rail 5 attached to the lower end of the ladder cord 4, and the head box 1 and the bottom rail 5 are supported. A plurality of slats 6, 6... And a lifting / lowering cord 7 that lifts and lowers the bottom rail 5.
For convenience of explanation, in the drawings, the longitudinal direction of the blind device 100 is described as “L”, the height direction as “H”, the front-rear direction as “FR”, the front side as “F”, and the rear side as “R”. .

(Head box)
The head box 1 is attached in a state where the blind device 100 is installed on the window frame, and is attached to the window frame via the bracket B. An operation unit 2 and a take-up drum 3 are provided inside the head box 1. Ladder cords 4 and elevating cords 7 are suspended from a plurality of locations of the head box 1 at a predetermined interval in the longitudinal direction L.

(Operation section)
The operation unit 2 is provided at one end of the head box 1 in the longitudinal direction L, and an operation cord 21 hanging from the head box 1 and an operation pulley 22 around which the operation cord 21 is wound in the head box 1. And have.
The operation cord 21 is an endless cord. By pulling the operation cord 21 up and down, an operation related to raising and lowering the bottom rail 5 by tilting the slat 6 and winding the raising and lowering cord 7 is performed.
The operation pulley 22 transmits the power transmitted from the operation cord 21 as a rotational force to the rotation shaft Rs that is rotatably supported in the head box 1. The rotating shaft Rs is attached so as to penetrate the winding drum 3 and rotate integrally with the winding drum 3, and rotates the winding drum 3 in response to transmission of force from the operation unit 2. .

(Winding drum)
Two winding drums 3 are provided in series in the longitudinal direction L in the head box 1 of the blind device 100. The two winding drums 3 are disposed between the adjacent lifting cords 7. As shown in FIG. 2, the winding drum 3 includes a drum base 31 that is attached to the head box 1 and a drum body 32 that winds the lifting cord 7.
One end of the winding drum 3 is rotatably mounted on the drum base 31 via a winding drum cover 33a and a drum holder 33b, and the other end of the winding drum 3 is mounted on the drum base 31 with a drum stop mechanism 34. It is rotatably attached via.
As shown in FIGS. 3 and 4, the drum base 31 has insertion openings 31 a and 31 b through which the ladder cord 4 and the lifting cord 7 are inserted. The insertion openings 31a and 31b are respectively formed on one end side in the longitudinal direction L and on the front side F and the rear side R of the drum base 31 in the front-rear direction FR (see FIG. 4 for the insertion openings 31a on the front side F). reference.).
For example, a rotating member 31c such as a cylindrical roller is rotatably supported on each insertion opening 31a via a shaft 31d. The rotating member 31c facilitates the movement of the lifting / lowering cord 7 between the inside and the outside of the head box 1. The lifting / lowering cord 7 is wound around the drum body 32 through the insertion openings 31a and 31b while being guided by the rotating member 31c, and is drawn out from the drum body 32 through the insertion openings 31a and 31b (hanging down). Or). That is, in the rotating member 31c, the lifting / lowering cord 7 is bridged on the outer peripheral surface to guide the lifting / lowering cord 7 in the hanging direction.

As shown in FIGS. 2 and 3, the drum main body 32 has a cylindrical shape, and the rotation axis Rs is inserted along the axis. A plurality of grooves 32a extending a predetermined length from one end to the other end are provided on the outer peripheral surface of the drum main body 32 at predetermined intervals in the circumferential direction. For example, four grooves 32a are provided at equal intervals. Most of the groove 32 a has a bottom, and is formed in a state that does not penetrate the drum body 32.
When the drum main body 32 is attached to the drum base 31, the groove 32a extends from the end opposite to the insertion openings 31a and 31b toward the end on the insertion openings 31a and 31b side. Of the plurality of grooves 32a, the two grooves 32a spaced apart from each other by 180 ° in the circumferential direction have slits 32b penetrating the drum body 32 in the thickness direction.
The end of the lifting / lowering cord 7 is locked and attached to the slit 32b. The slit 32b is formed in the groove 32a at the end of the drum body 32 opposite to the insertion openings 31a and 31b when the drum body 32 is attached to the drum base 31. The slit 32b extends along the longitudinal direction L by a predetermined length.

As shown in FIG. 3, the drum stop mechanism 34 includes a stop drum 34a, a stop drum cap 34b, and a stopper 34c that rotate integrally with the rotation shaft Rs and are rotatably attached to the drum base 31. The stop drum cap 34b is interposed between the stop drum 34a and the other end of the take-up drum 3, and the stopper 34c is pivoted on a pin 34d projecting from the stop drum cap 34b toward the stop drum 34a. It is worn.
In the drum stop mechanism 34, when the elevating cord 7 fixed to the end of the drum main body 32 on the drum stop mechanism 34 side is tensioned when the slat 6 is lowered, the stopper 34c is moved between the stop drum 34a and the stop drum cap 34b. A position that does not protrude outward in the radial direction of the stop drum 34a is held.

  Thus, when the lifting / lowering cord 7 is unwound from the winding drum 3 and the bottom rail 5 comes into contact with an obstacle (not shown) and the lifting / lowering cord 7 is loosened, the stopper 34c is moved between the stop drum 34a and the stop drum cap 34b. In the meantime, it protrudes outward in the radial direction of the stop drum 34 a and comes into contact with a stopper block portion (not shown) of the drum base 31. As a result, the rotation of the stop drum 34a, the stop drum cap 34b, and the drum body 32 is prevented, and the lowering of the bottom rail 5 is stopped.

The winding drum 3 further includes a ladder drum 35 and a ladder clamp 36. The end of the ladder cord 4 is fixed to a ladder clamp 36, and the ladder clamp 36 is slidably fitted on the ladder drum 35.
A ladder clamp 36 is fitted on the ladder drum 35 so as to be slidable in the circumferential direction. The ladder drum 35 is configured to slide in the circumferential direction with a predetermined frictional force with respect to the ladder clamp 36. A rotation shaft Rs is inserted into the ladder drum 35. The ladder drum 35 rotates with the rotation axis Rs. Along with the rotation of the ladder drum 35, the ladder clamp 36 also rotates together with the tilt movement of the slat 6.
Two or more winding drums 3 may be provided. Specifically, the winding drums 3 are provided according to the length of the blind device 100, the number of the lifting cords 7, and the like.

(Ladder code)
The ladder cord 4 is suspended from the head box 1 at a predetermined interval in the longitudinal direction of the head box 1. For example, the ladder cord 4 hangs down from the head box 1 at the same position as the lift cord 7 in the longitudinal direction L. Further, the ladder cord 4 may be suspended from the head box 1 between the two lifting cords 7.
Since the ladder clamp 36 is slidably fitted on the ladder drum 35, the ladder cord 4 whose tip is fixed to the ladder clamp 36 has the rotational force of the rotary shaft Rs by the operation of the operation cord 21 as a ladder. It is transmitted to the drum 35 and tilted in the height direction H.
As shown in FIG. 4, the ladder cord 4 includes a hanging portion 41 b hanging from the head box 1 on the front side F and the rear side R at a predetermined interval in the front-rear direction FR, and hanging portions on the front side F and the rear side R. It has the connection part 41c which connects 41b. The connecting portions 41c are provided in pairs in the height direction H with a slight space enough to accommodate the slats 6. A loop-shaped insertion portion (insertion wheel) 41d through which the lifting / lowering cord 7 is inserted is formed at a connection position between the hanging portion 41b and the connecting portion 41c.

(Bottom rail)
As shown in FIG. 1, the bottom rail 5 is attached to the lower ends of the ladder cord 4 and the lifting / lowering cord 7, and when the lifting / lowering cord 7 is wound up, the slats 6, 6 arranged on the upper side of the bottom rail 5. ... are piled up.
As shown in FIG. 4, the bottom rail 5 has a cover 51 that fixes the elevating cord 7 on the lower surface 5 a of the bottom rail 5. Moreover, the bottom rail 5 has the opening part 5b in which the other end of the raising / lowering cord 7 mentioned later is inserted in the lower surface 5a.

(Slat)
The slat 6 is a thin plate-like member, and is held by the ladder cord 4 in a state where the connecting portion 41c of the ladder cord 4 extends in the horizontal direction with a predetermined interval in the vertical direction. A plurality of slats 6 are provided between the head box 1 and the bottom rail 5, and the front edge and the rear edge in the front-rear direction FR are positioned on the upper side and the lower side in the vertical direction by the operation of the operation unit 2. It can be rotated and tilted.
As shown in FIG. 5, the slat 6 has a notch 61 recessed in the front-rear direction FR at the front edge and the rear edge at a position where the ladder cord 4 and the lifting cord 7 are suspended in the longitudinal direction L. The connecting portion 41 c of the ladder cord 4 is engaged with the notch 61.

(Elevating cord)
As shown in FIG. 1, the lifting / lowering cord 7 is suspended from the head box 1 at two positions at a predetermined interval along the longitudinal direction L of the blind device 100.
As shown in FIGS. 4 and 5, at each hanging position in the head box 1, the lifting / lowering cord 7 includes two separate front lifting / lowering cords 71 and a rear R lifting / lowering cord 76 in the present embodiment. Have. One end of the front elevating cord 71 is attached to the drum body 32 in the head box 1, and the other end is fixed to the bottom rail 5 by hanging down the front side F of the slat 6 from the insertion opening 31 a on the front side F.
One end of the rear lifting / lowering cord 76 is attached to the drum body 32 in the head box 1, and the other end is attached to the bottom rail 5 by hanging down the rear side R of the slat 6 from the insertion opening 31 b on the rear side R. ing.

As shown in FIGS. 6 and 7, the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are guided by the rotating member 31c in the insertion opening 31a on the front F and the insertion opening 31b on the rear R, respectively. 32 is wound around the outer periphery. One end of each of the front raising / lowering cord 71 and the rear raising / lowering cord 76 is engaged with the slit 32 b of the drum main body 32.
As shown in FIG. 4, the other ends of the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are sandwiched by the cover 51 in a state of being inserted into the opening 5 b formed in the lower surface 5 a of the bottom rail 5. Is fixed.

In the present embodiment, the lifting / lowering cord 7 is suspended from two places, but depending on the length of the blind device 100, it may be suspended from three or more places. The number of take-up drums 3 is also changed.
Further, the attachment position of the lifting / lowering cord 7 in the drum main body 32 may not be a position separated by 180 °, and can be arbitrarily set as long as it is a different position in the drum main body 32, for example, a position separated by 90 °. Or they may be attached at the same position.

[Arrangement of each configuration]
Next, the arrangement of each component in the blind device 100 will be described.
As shown in FIG. 1, two winding drums 3 are arranged in series along the longitudinal direction L of the blind device 100 in the head box 1. The two winding drums 3 and 3 are arranged so that the slits 32b of the respective drum bodies 32 face each other. That is, the winding drums 3 and 3 are disposed between the ladder cord 4 and the lifting cord 7 that are suspended from two places. In the embodiment, the elevating cord 7 is suspended from both ends of the head box 1 in the longitudinal direction L.
Further, the front lifting / lowering cord 71 is suspended from the insertion opening 31a on the front F, and the rear lifting / lowering cord 76 is suspended from the insertion opening 31b on the rear R.
By disposing the winding drum 3 between the two lifting / lowering cords 7, only the operation unit 2 can be disposed between the ladder cord 4 and the end portion of the slat 6. Compared with the configuration in which the winding drum 3 is arranged in addition to the operation unit 2 between the ladder cord 4 and the end portion of the slat 6, the blind device 100 is provided from the ladder cord 4 and the lifting / lowering cord 7 to the end portion of the slat 6. Therefore, it is possible to suppress the end portion of the slat 6 from drooping.

  In the head box 1, the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are attached to the drum main body 32 at positions separated by 180 °. By separating the attachment positions of the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 from each other, it is possible to prevent the cords 71 and 76 from being entangled with each other when the winding drum 3 winds the cords 71 and 76.

The front lifting / lowering cord 71 and the rear lifting / lowering cord 76 that are suspended from the same position in the longitudinal direction L are arranged at positions facing each other in the front-rear direction FR of the slat 6, and the drum body 32 of the same winding drum 3. Is attached.
Therefore, it is not necessary to prepare the winding drum 3 for the front lifting / lowering cord 71 and the winding drum 3 for the rear lifting / lowering cord 76 separately. Thus, the blind device 100 having a narrow width in the front-rear direction FR can be configured, and the number of components can be suppressed. Therefore, in the blind device 100, an orderly arrangement of components in the head box 1 can be achieved. it can.

As shown in FIG. 4, the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are inserted into the insertion portion 41 d except for a portion of the insertion portion 41 d of the ladder cord 4 from the head box 1.
If the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are inserted into all the insertion portions 41d of the ladder cord 4, even if the slats 6, 6. The ladder cord 4 is in a state of being caught by the front lifting / lowering cord 71 and the rear lifting / lowering cord 76. That is, the ladder cord 4 is in a state where the slats 6, 6... Are opened without moving in the vertical direction. As a result, a gap is formed between the slats 6, 6..., And the function as the blind device 100 cannot be sufficiently exhibited.
For example, referring to FIG. 8B, when a part of the insertion portion 41 d on the upper side of the ladder cord 4 is caught by the front lifting / lowering cord 71 and the rear lifting / lowering cord 76, the ladder cord 4 is connected to the front lifting / lowering cord 71. It can be seen that the gap is opened by a distance from the rear lifting / lowering cord 76.

On the other hand, in the blind device 100, the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 do not pass through a part of the insertion portion 41 d of the upper ladder cord 4 in the height direction H in the front-rear direction FR. Thus, all the slats 6 can be tilted.
Note that “excluding a part of the insertion portions 41 d” is assumed to be a range in which, for example, the nearest 3 to 10 slats 6 are supported from the head box 1. However, the range in which the lifting / lowering cord 7 cannot be inserted through the insertion portion 41d can be appropriately changed depending on the configuration of the blind device 100.

  Although not shown, the ladder cord 4 may be suspended between two lifting cords 7 shown in FIG. In this case, in the head box 1, only the ladder drum 35 and the ladder clamp 36 may be provided between the winding drums 3 and 3.

[Operation of blind device]
Next, the operation of the blind device 100 will be described with reference to FIG.
FIG. 8 is a diagram for explaining the operation of the blind device 100, FIG. 8 (a) is a diagram showing the horizontal state of the slats, and FIG. 8 (b) is a diagram showing the tilted state of the slats. is there.
First, by pulling the loop-shaped operation cord 21, the operation pulley 22 around which the operation cord 21 is wound rotates. The rotational force of the operation pulley 22 is transmitted to the rotation axis Rs via a gear (not shown), and is converted into a force that rotates the rotation axis Rs.

As the rotation shaft Rs rotates, the ladder drum 35 and the ladder clamp 36 to which the ladder cord 4 is fixed rotate, and the ladder cord 4 has either the front side F or the rear side R in the front-rear direction FR upward. It moves and the other moves downward and tilts (change from the state of FIG. 8A to the state of FIG. 8B).
When the operation cord 21 is further pulled, the ladder clamp 36 idles on the ladder drum 35, and the drum body 32 starts to rotate without the slat 6 being tilted. As the drum body 32 rotates, the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are wound around the drum body 32 and the bottom rail 5 starts to rise.

In the blind device 100, the bottom rail 5 rises from the front side R and the rear side F in a state of being sandwiched between the front side lifting / lowering cord 71 and the rear side lifting / lowering cord 76, respectively. It is possible to reliably prevent the slats from being destroyed from posture.
Thus, even if the bottom rail 5 is tilted when the bottom rail 5 is lifted, it is possible to prevent the bottom rail 5 from tilting when the bottom rail 5 is lifted and prevent the slats 6, 6. Therefore, the appearance of the blind device 100 during the lifting operation is not impaired.

  Further, since the rotation members 31 c are provided in the insertion openings 31 a and 31 b of the head box 1, the front elevating cord 71 and the rear elevating cord 76 are rotated when the drum body 32 is wound with the rotation. The top is rolled up smoothly. Furthermore, since the front lifting / lowering cord 71 and the rear lifting / lowering cord 76 are not in contact with the edges of the insertion openings 31a and 31b, damage due to contact with the head box 1 can be avoided.

As described above, according to the blind device 100, since the lifting / lowering cord 7 is disposed before and after the slat 6, the bottom rail 5 is not wound up with an uneven balance during winding, and the bottom rail 5 is in its posture. It is possible to rise straight while maintaining Thereby, the balance of the bottom rail 5 is not lost and tilted, and the appearance can be improved. Further, the slats 6 stacked on the upper surface of the bottom rail 5 do not collapse to the front and rear sides with the inclination of the bottom rail 5, and the appearance at the time of winding can be improved.
Moreover, since the raising / lowering cord 7 arrange | positioned before and behind the slat 6 with the same winding drum 3 can be wound up, the four raising / lowering cords 7 can be wound up with the two winding drums 3. FIG. Thereby, the inclination of the bottom rail 5 can be prevented by the two winding drums 3, and it is possible to deal with a narrow type blind device. Furthermore, since the front and rear lifting / lowering cords 7 can be simultaneously wound with one winding drum 3, the time required for winding can be shortened and the number of parts of the blind device 100 can be reduced.

Moreover, since the one end part of the raising / lowering cord 7 is attached to the bottom rail 5, the raising / lowering cord 7 does not slide on the surface of the bottom rail 5, and the operation resistance at the time of operation can be reduced.
Further, since the two winding drums 3 are disposed between the adjacent lifting / lowering cords 7, the ladder cord 4 is compared with the case where the winding drum 3 is disposed outside the lifting / lowering cord 7 and the ladder cord 4. The distance from the end of the slat 6 to the end of the slat 6 can be shortened, and the bending due to the weight of the end due to the length of the slat 6 can be suppressed.
Moreover, since the weight of the bottom rail 5 and the slat 6 acts on the lifting / lowering cord 7 by half, the load acting on the lifting / lowering cord 7 is reduced compared to the conventional case, and the operability is improved. Further, the lifting of the bottom rail 5 caused by the load acting on the lifting / lowering cord 7 can be suppressed.

<Modification>
The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present invention.
For example, as shown in FIG. 9, the lifting / lowering cord may be composed of a single cord. FIG. 9 is a view showing a modification of the lifting / lowering cord.
Below, the structure of the raising / lowering cord 7A is demonstrated. For convenience of explanation, the configuration will be described along the extending direction from one end to the other end of the lifting / lowering cord 7A.

The lifting / lowering cord 7 </ b> A is formed of a single cord, has two ends, and both ends are attached and locked to the slit 32 b of the drum body 32.
In a state where one end of the lifting / lowering cord 7 is attached to the drum main body 32, the other end is suspended from the head box 1 through the insertion opening 31 a on the front side F, for example. The lifting / lowering cord 7 changes the extending direction from the lower side to the upper side so as to straddle the bottom rail 5 along the lower surface 5a while being inserted through the insertion portion 41d of the ladder cord 4 except for a part.
On the lower surface 5 a, the lifting / lowering cord 7 is inserted through a space formed between the bottom rail 5 and the cover 51.
The other end of the lifting / lowering cord 7A extends upward along the ladder cord 4, enters the head box 1 through the insertion opening 31b on the rear side R, is wound around the drum body 32, and is slit 32b. It is locked to.
Even when the lifting / lowering cord 7A is used, at least the same actions and effects as those of the above embodiment can be obtained. Furthermore, by forming the lifting / lowering cord 7A with a single cord, the work burden of attaching the lifting / lowering cord 7A to the winding drum 3 can be reduced.

Further, as shown in FIGS. 10 to 12, the winding drum 3 may have a ring member (sliding member) 8 that is slidable on the drum main body 32.
FIG. 10 is a view for explaining the configuration of the ring member, FIG. 10 (a) is a plan view of the ring member, and FIG. 10 (b) is a perspective view of the ring member. FIG. 11 is a perspective view showing a state in which the ring member is attached to the drum body. FIG. 12 is a cross-sectional view of the winding drum to which the ring member is attached along the longitudinal direction.

As shown in FIGS. 10A and 10B, the ring member 8 includes two flange-shaped step portions 81 that protrude radially outward from the outer peripheral surface. A slit 81 a having a predetermined interval in the circumferential direction is formed between the two step portions 81. The slit 81 a extends along the axis x of the ring member 8, and the width of the slit 81 a extends along the axis x.
Each step 81 extends substantially 180 ° on the outer peripheral surface of the ring member 8. An accommodating portion 82 for attaching the end portions of the elevating cords 7 and 7A is formed at a position where the two step portions 81 face each other.

Each accommodating portion 82 is formed by a pair of side walls 82a extending radially outward and facing each other in the circumferential direction, a circumferential wall 82b extending from each of the side walls 82a in the circumferential direction, and a stepped portion 81. And a bottom wall 82c. A housing space 83 for housing the elevating cords 7 and 7A in the housing portion 82 is defined by a side wall 82a, a peripheral wall 82b, and a bottom wall 82c.
A slit 82d extending radially outward is formed in the bottom wall 82c, and the slit 82d is continuous with the slit 81a. The slit 82d has a circular opening on the radially inner side.

  A recess 81b is formed along the axis x of the ring member 8 on the outer peripheral surface of the ring member 8 facing the slit 81a. When the lifting / lowering cords 7 and 7A are attached to the accommodating portion 82, the lifting / lowering cords 7 and 7A are accommodated in the recess 81b.

  The ring member 8 has four protrusions 84 and 85 that protrude radially inward on the inner peripheral surface and extend in the axial direction. Of the four protrusions, the protrusion 84 formed on the inner peripheral surface at the same position as the accommodating portion 82 is formed with a wider width in the circumferential direction than the protrusion 85 formed between the protrusions 84. The four protrusions 84 and 85 are arranged at equal intervals from each other.

  As shown in FIG. 11, the ring member 8 is attached to the drum main body 32 by fitting the protrusions 84 and 85 into the groove 32 a of the drum main body 32. The ring member 8 is movable in the longitudinal direction L on the drum main body 32. The grooves 32a of the drum main body 32 may be formed to dimensions corresponding to the protrusions 84 and 85, respectively. That is, the dimension in the circumferential direction of the groove 32 a engaged with the protrusion 84 is larger than the dimension in the circumferential direction of the groove 32 a engaged with the protrusion 85.

  As shown in FIG. 12, by providing the ring member 8, the lifting / lowering cords 7 and 7A are attached to the winding drum 3 by attaching the end portions of the lifting / lowering cords 7 and 7A through the slits 81a and 82d. Therefore, as compared with the configuration in which the drum body 32 is directly attached to the drum body 32, the drum body 32 can be easily performed without removing it from the drum base 31.

DESCRIPTION OF SYMBOLS 1 Head box 2 Operation part 3 Winding drum 31 Drum base 31b Insertion opening part (opening part)
31c Rotating member 32 Drum body 32a Groove 32b Slit 4 Ladder cord 41a, 41b Hanging part 41c Connection part 41d Insertion part (insertion wheel)
5 Bottom rail 5a Lower surface 51 Cover 6 Slat 7 Lift code 71 Front lift code 76 Rear lift code 8 Ring member (slide member)
x axis 100 blind device

Claims (9)

A plurality of ladder cords suspended from the head portion at a predetermined interval;
A bottom rail provided at the lower end of the plurality of ladder cords;
A plurality of slats supported by the ladder cord at a predetermined interval between the bottom rail and the head portion;
A lifting cord that hangs down from the head part and is engaged with the bottom rail, and lifts and lowers the bottom rail;
A winding drum to which the lifting cord is attached and winds the lifting cord; and
The blind device is characterized in that the lifting cords are suspended so as to face each other in the front-rear direction of the slats, and the opposing lifting cords are respectively attached to the same winding drum.   2. The blind device according to claim 1, wherein ends of the lifting cords facing each other are respectively attached to different positions of the winding drum. The winding drum has a slit extending along the longitudinal direction;
The blind device according to claim 1 or 2, wherein an end portion of the elevating cord is locked to the slit. The winding drum is provided with a slide member that is movable in the axial direction on the outer peripheral surface thereof,
The blind device according to claim 1, wherein the elevating cord is attached to the slide member. The elevating cords are respectively suspended from a plurality of positions separated from each other,
The blind device according to any one of claims 1 to 4, wherein the winding drum is provided between the adjacent lifting cords.   The elevating cord includes a front elevating cord suspended from the front side of the slat and a rear elevating cord suspended from the rear side of the slat, and each of the front elevating cord and the rear elevating cord has one end The blind device according to any one of claims 1 to 5, wherein the blind device is fixed to a bottom rail and has the other end attached to the winding drum.   The blind device according to any one of claims 1 to 6, wherein the elevating cord is a single cord, and is folded around the bottom rail. The ladder cord is provided with an insertion wheel through which the elevating cord is inserted,
The blind device according to any one of claims 1 to 7, wherein the lifting / lowering cord is inserted into the insertion wheel excluding at least a part of the insertion wheel from the head portion.   9. The head according to claim 1, further comprising: a rotating member that is rotatable about an axis, and that includes a rotating member that spans the elevating cord on an outer peripheral surface and guides the elevating cord in a hanging direction. A blind device according to claim 1.

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