JP5401720B2 - Blind lift height determining device - Google Patents

Description

  The present invention relates to a lifting / lowering height position determination device for a blind that can regulate the lifting / lowering of the shielding material when the shielding material is positioned at a desired lifting height, and that can adjust the lifting / lowering height position.

  2. Description of the Related Art Conventionally, a device described in Patent Document 1 has been known as a lift height position determination device for this type of blind. According to this, the stopping means is an output shaft provided with a winding drum for winding up the cord of the blind which is a shielding material, or a screw member integrally connected to the shaft, and is screwed to the screw member and manually operated. It consists of a moving nut that is prevented from rotating in a cylindrical cage that is prevented from rotating in the casing by possible restraining means. When the output shaft rotates to raise and lower the blind, the moving nut moves in the gauge accordingly, and the moving nut contacts the stopper integrated with the cage, so that the blind is stopped at the bottom stop position. A stop state is detected. Further, since the bottom stop point is adjusted by releasing the cage restrained state by the restraining means and driving and rotating the cage, the unwinding position of the blind can be adjusted.

JP-A-9-25776

  By the way, in general, an output shaft or shaft that is a rotating shaft that rotates to raise and lower the shielding material is a long shaft, and predetermined bending is allowed and set according to the standard. Therefore, when the output shaft is actually rotating, there is a case where the output shaft is rotating while being bent like a jump rope according to the load of the shielding material acting on the output shaft. When such a bending of the output shaft occurs, the screw member integrally connected to the output shaft also rotates with a slight inclination, and the moving nut that engages with the screw member is inclined with respect to the cage. There is a problem that the movement may be hindered.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a blind lifting height determination device that is less likely to be hindered in operation even when the rotating shaft is bent.

In order to achieve the above-described object, the invention according to claim 1 is directed to the rotation of a winding drum that is disposed in the head box and winds and unwinds the lifting / lowering cord to lift and lower the shielding member. In the lifting height determining device for a blind that can be regulated when positioned at a desired lifting height,
A rotating cylinder provided coaxially with a rotating shaft for rotationally driving the winding drum, and rotatable integrally with the rotating shaft;
A drive cylinder that is coaxially disposed in the rotary cylinder and is inserted in the axial direction so as to be relatively rotatable without engaging the rotary axis;
A slider that is disposed between the rotating cylinder and the driving cylinder , is movable in these axial directions by rotation of the rotating cylinder or the driving cylinder, and is controlled to move by engaging with an end of the driving cylinder ; With
When the slider is engaged with the end of the drive cylinder and the movement is restricted, the rotation of the rotary cylinder, the rotation shaft, and the take-up drum is restricted, and the elevation height of the blind is determined.
The drive cylinder can be rotated from the outside of the head box without rotating the rotary shaft.

  According to a second aspect of the present invention, in the blind height determining apparatus according to the first aspect, a worm gear that rotates integrally with the drive cylinder is provided at one end of the drive cylinder, and the worm gear is a part of the head box. It can be operated from the opening formed in the above.

  According to a third aspect of the present invention, in the blind height determining apparatus according to the first or second aspect, a male screw is formed on the outer periphery of the drive cylinder, and the male screw is formed on the inner periphery of the slider. A guided portion is formed on the outer periphery of the slider, and the guided portion is not rotatable relative to the guide portion formed on the inner periphery of the rotating cylinder and is axially disposed. Is characterized in that it is movably engaged.

  According to a fourth aspect of the present invention, in the blind height determining apparatus according to the first or second aspect, a female screw is formed on the inner periphery of the rotating cylinder, and the female screw is formed on the outer periphery of the slider. A guided portion is formed on the inner periphery of the slider, and the guided portion is relatively non-rotatable with respect to the guide portion formed on the outer periphery of the drive cylinder and in the axial direction. Is characterized in that it is movably engaged.

  According to the present invention, since the rotating shaft is inserted so as to be relatively rotatable without engaging the driving cylinder, the driving cylinder is not affected by the bending of the rotating shaft that occurs when the rotating shaft is driven to rotate. Therefore, the drive cylinder does not tilt, and it is possible to prevent the slider from being hindered from moving.

  Further, the position of the slider can be adjusted by rotating the drive cylinder from the outside of the head box without rotating the rotating shaft.

  According to the second aspect of the invention, since the position of the slider with respect to the drive cylinder can be adjusted by operating the worm gear from the opening formed in the head box, it is easy to adjust the lifting position of the shielding material. Can be done.

It is a front view of the blind to which the raising / lowering height determination apparatus of the blind which concerns on this invention is applied. It is a top view of the raising / lowering height determination apparatus which concerns on embodiment of this invention. It is a disassembled perspective view of the principal part of the raising / lowering height determination apparatus of a blind. It is aa sectional drawing of FIG. It is a half sectional view showing the state of the raising / lowering height determination apparatus in case a blind is in the middle of raising / lowering. It is a half sectional view showing the state of the raising / lowering height determination device when the blind is stopped at the set position. It is a half sectional view of the raising / lowering height determination apparatus of the blind which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the blind to which the blind lifting height determining apparatus according to the present invention is applied can be applied to any blind that can lift and lower a shielding material suspended from a head box. The thing represents the example applied to the pleated screen. However, the present invention is not limited to this, and the present invention can be applied to any type of blind such as a horizontal blind using a large number of slats suspended from a head box via a ladder cord as a shielding material.

  The blind 10 has a head box 12 attached to a wall surface or a ceiling surface via a bracket 11, and a rotary shaft 14 is rotatably disposed in the head box 12. The rotating shaft 14 is made of a long object, but it is not necessarily made of a single member, and may be composed of a plurality of members connected to each other. The outer peripheral surface of the rotating shaft 14 is a polygon such as a hexagon.

  The rotary shaft 14 is inserted so as not to rotate relative to the take-up drum 16 that is also disposed in the head box 12, and the upper end of the lifting / lowering cord 18 is taken up and unwound in the take-up drum 16. Connected as possible. The lower end of the lifting / lowering cord 18 is connected to the head box 12 and the bottom rail is disposed at the lowermost end of the screen 20 through each of the hooks of the screen 20 having a hook as a shielding material hanging from the head box 12. 22 is connected. The rotary shaft 14 is operated by an operation cord 26 that hangs down from a control unit 24 provided at one end of the head box 12, and is switched between a state where rotation can be driven and a state where rotation is restricted by a stopper 27. However, the rotational drive of the rotating shaft 14 can be an electric type, and the rotating shaft 14 can be connected to the output shaft of the electric motor.

  The lifting height determination device 28 according to the present invention is disposed in the head box 12 and restricts the rotational drive of the rotating shaft 14 when the screen 20 is positioned at a desired lifting height, thereby allowing the winding drum 16 to move. Regulates rotational drive.

  Specifically, as shown in FIGS. 2 and 3, the lifting height determining device 28 includes a rotary cylinder 30 provided coaxially with the rotary shaft 14, a drive cylinder 32 provided coaxially within the rotary cylinder 30, and rotation. A slider 34 disposed between the cylinder 30 and the drive cylinder 32, a worm 40, and a case 38 which accommodates these and is fixed in the head box 12 are provided.

  One end 30a of the rotating cylinder 30 protrudes from one end of the case 38, and is supported by the case 38 so as to be rotatable and immovable in the axial direction. As shown in FIG. 5, the rotary shaft 14 is inserted into the rotary cylinder 30 in the axial direction, and one end 30 a of the rotary cylinder 30 is engaged with the rotary shaft 14. 14 is integrated with the rotary shaft 14. On the inner peripheral surface of the rotating cylinder 30, a plurality of guide portions 30 b are provided so as to project substantially over the entire length in the axial direction at two positions spaced apart in the circumferential direction.

  The drive cylinder 32 is coaxially arranged in the rotary cylinder 30 and is inserted into the drive cylinder 32 in the axial direction so as to be relatively rotatable without being engaged with the rotary shaft 14. A male screw 32a is formed on the outer periphery of the drive cylinder 32, and a worm wheel 32b is formed on one end of the outer periphery. Further, a protrusion 32c is formed in the axial direction from the side surface of the worm wheel 32b in the direction in which the male screw 32a is formed. One end of the drive cylinder 32 on the worm wheel 32 b side is rotatably supported by the other end of the case 38, and the other end is rotatably supported by the rotary cylinder 30. It is pivotally supported so that it cannot move.

  As shown in FIG. 4, a worm 40 meshes with the worm wheel 32b, and these constitute a worm gear. The lower end portion 40 a of the worm 40 protrudes outside the case 38. Further, as shown in FIG. 3, a wrench hole 40b into which a hexagon wrench can be inserted is formed at the lower end portion 40a of the worm 40, and a hex wrench is inserted into the wrench hole 40b from the outside of the head box 12 to provide the worm 40. Can be operated.

  A slider 34 is disposed between the rotary cylinder 30 and the drive cylinder 32. In the slider 34, guided portions 34 a penetrating in the axial direction are formed in concave shapes at two positions spaced apart in the circumferential direction on the outer peripheral surface thereof, and engage with the guide portions 30 b of the rotary cylinder 30, respectively. As a result, the slider 34 is not relatively rotatable with respect to the rotary cylinder 30 but is engaged with the guide portion 30b so as to be movable in the axial direction. A female thread 34 b is formed on the inner peripheral surface of the slider 34 and is screwed with the male thread 32 a of the drive cylinder 32. Accordingly, the slider 34 is moved in the axial direction of the rotary cylinder 30 and the drive cylinder 32 by the rotational drive of the rotary cylinder 30 or the drive cylinder 32. Further, an engagement convex portion 34c is formed on the surface of the slider 34 facing the worm wheel 32b in the axial direction. When the slider 34 moves the drive cylinder 32 to the end on the worm wheel 32b side, the engagement convex portion 34c is formed. The part 34c and the protrusion 32c are engaged, and further movement of the slider 34 is restricted.

Next, the operation of the lifting height determination device 28 according to the present embodiment will be described.
When the screen 20 is moved up and down, the operation code 26 is operated to rotate the rotary shaft 14. Since the winding drum 16 rotates integrally with the rotating shaft 14, the lifting / lowering cord 18 is wound or unwound on the winding drum 16, and the screen 20 is moved up and down. At this time, in the lifting / lowering height determination device 28, if the slider 34 is positioned at an intermediate position in the axial direction of the rotating cylinder 30 and the driving cylinder 32 as shown in FIG. 5, the rotating cylinder 30 rotates integrally with the rotating shaft 14. The slider 34 also rotates integrally with the rotary cylinder 30, while the drive cylinder 32 does not rotate due to the self-lock effect of the worm gear, so the rotary cylinder 30 rotates relative to the drive cylinder 32, and the slider 34 It is guided by 32 male screws 32 a and moves in the axial direction of the rotary cylinder 30 and the drive cylinder 32.

  When the screen 20 descends, as shown in FIG. 6, when the slider 34 moves in a direction approaching the protrusion 32c and the engagement protrusion 34c engages with the protrusion 32c, the slider 34 moves further. Therefore, the rotation of the rotary cylinder 30 is restricted. Thereby, the rotation of the rotating shaft 14 and the winding drum 16 is restricted, and the lowering of the screen 20 is restricted. Thus, the position where the lowering of the screen 20 is restricted becomes the lower limit position of the screen 20, and the screen 20 cannot be lowered further.

  The rotation of the rotating shaft 14 is restricted only by engaging the engaging projection 34c of the slider 34 with the protrusion 32c of the worm wheel 32b. Therefore, the operation cord 26 is operated in the opposite direction to rotate the rotating shaft. When the rotary cylinder 14 is driven to rotate in the opposite direction, the rotary cylinder 30 rotates in the opposite direction, so that the slider 34 moves in a direction in which the engaging protrusion 34c is separated from the protrusion 32c, and the screen 20 rises. .

  Since the rotary shaft 14 is inserted so as to be relatively rotatable without engaging with the drive cylinder 32, even if the rotary shaft 14 bends when the rotary shaft 14 is driven to rotate, the influence of the drive cylinder 32 is affected. Therefore, it is possible to prevent the drive cylinder 32 from being tilted. Similarly, the rotary cylinder 30 is not easily affected by this, so that the movement of the slider 34 is not hindered.

  As shown in FIG. 5, when the slider 34 is in the middle of the rotary cylinder 30 and the drive cylinder 32 in the axial direction, a hexagon wrench (not shown) is inserted into the wrench hole 40 b of the worm 40 and the worm 40 is rotated. The rotation is transmitted to the worm wheel 32b meshing with the worm 40, and the drive cylinder 32 rotates. As a result, the rotational force of the drive cylinder 32 is also transmitted to the slider 34. However, when the screen 20 is stopped, the rotational shaft 14 is restricted from being rotationally driven by the stopper 27 or by a load from the shielding material. Accordingly, since the rotation of the rotary cylinder 30 is also restricted, the drive cylinder 32 rotates relative to the rotary cylinder 30, and the guided part 34 a of the slider 34 is guided by the guide part 30 b of the rotary cylinder 30. It moves in the axial direction of the drive cylinder 32. In this way, when the slider 34 is moved so as to approach the protrusion 32c, the lower limit position of the screen 20 rises. Conversely, when the slider 34 is moved to the opposite side of the protrusion 32c, the screen 20 Lower limit position is lowered.

  Therefore, by rotating the worm 40, the lower limit position of the screen 20 can be set to a desired elevation height.

  Specifically, when the lower limit position is set lower than the current set position, the worm 40 is rotated from the state in which the engaging convex portion 34 c of the slider 34 is engaged with the protruding portion 32 c of the drive cylinder 32. If the slider 34 is further moved in the direction of the protrusion 32c, the slider 34 is restricted from further movement, so that the drive cylinder 32 and the rotary cylinder 30 rotate integrally through the slider 34, and the rotary shaft 14 is rotated. Rotates, the lifting cord 14 is unwound from the winding drum 16, and the screen 20 descends. When the screen 20 is lowered to a position to be newly set as the lower limit position, when the rotation operation of the worm 40 is stopped, the setting of the lower limit position is completed.

  In order to make the lower limit position higher than the current set position, when the operation code 18 is operated to raise the screen 20 to a position to be newly set as the lower limit position, the stopper 27 is operated at that position to raise the screen. Stop. Here, the worm 40 is rotated so that the engaging projection 34c of the slider 34 moves in a direction to engage with the protrusion 32c of the drive cylinder 32. Setting is complete.

  Thus, by rotating the worm 40, the adjustment work of the elevation height of the screen 20 can be easily performed.

  In the above embodiment, the lower limit position of the screen 20 is determined in the lifting height determination device 28, but the present invention is not limited to this, and the upper limit position of the screen 20 may be determined.

  In the above embodiment, the slider 34 is set to move toward the one end side of the drive cylinder 32 having the worm wheel 32b as the screen 20 approaches the set position. However, the present invention is not limited to this. The slider 34 may move in the direction of the one end 30a of the rotary cylinder 30 on the opposite side to the worm wheel 32b. When the movement of the slider 34 is regulated, the slider 34 is regulated at a portion close to the support point of the rotary cylinder 30 with respect to the rotary shaft 14, whereby torsion generated in the rotary cylinder 30 can be reduced.

  Further, in order to operate the worm 40, an opening can be formed in the head box 12, and the operation can be performed from the opening. Furthermore, although the wrench hole 40b into which the hex wrench can be inserted is formed in the worm 40, the wrench hole 40b is not limited to this, and the mechanism for driving the drive cylinder 32 to rotate is not limited to the worm gear. The worm 40 may be provided with a dial that can be directly operated by hand without using a tool such as a wrench.

  In the above embodiment, the drive cylinder 32 has a male screw 32 a, the rotary cylinder 30 has a guide portion 30 b, and the slider 34 has an internal thread 34 b that is screwed with the male screw 32 a of the drive cylinder 32. However, the present invention is not limited to this, and as shown in FIG. 7, a female screw is provided on the inner periphery of the rotating cylinder, and the driving cylinder is provided. A guide part is formed on the outer periphery of the slider, a male screw is formed on the outer periphery of the slider, and a guided part is formed on the inner periphery, and the female screw of the rotary cylinder and the male screw of the slider are screwed together, and the slider is fitted on the guide part of the drive cylinder. The slider may be engaged with each other so that the slider is not rotatable relative to the drive cylinder but is guided by the guide so as to be movable in the axial direction.

  Moreover, a guide part and a to-be-guided part can be comprised by arbitrary means, such as a spline, a key, and a polygonal fitting.

12 Head box 14 Rotating shaft 16 Winding drum 18 Lifting cord 20 Pleated screen (shielding material)
28 Lifting Height Determining Device 30 Rotating Tube 30b Guide Part 32 Drive Tube 32a Male Screw 32b Worm Wheel (Worm Gear)
34 Slider 34a Guided part 34b Female screw 40 Worm (worm gear)

Claims (4)

The shielding material (20) is disposed in the head box (12), and the shielding material (20) rotates the winding drum (16) that winds and unwinds the lifting cord (18) to raise and lower the shielding material (20). In the blind lifting height determining device that can be regulated when positioned at the lifting height,
A rotating cylinder (30) provided coaxially with a rotating shaft (14) for rotationally driving the winding drum (16) and capable of rotating integrally with the rotating shaft;
A drive cylinder (32) disposed coaxially in the rotary cylinder and inserted in the axial direction so as to be relatively rotatable without engaging the rotary shaft;
A slider (34) which is disposed between the rotating cylinder and the driving cylinder and is movable in these axial directions by rotation of the rotating cylinder or the driving cylinder and whose movement is restricted by engaging with the end of the driving cylinder. ) And
When the slider is engaged with the end of the drive cylinder and the movement is restricted, the rotation of the rotary cylinder, the rotation shaft, and the take-up drum is restricted, and the elevation height of the blind is determined.
A blind lifting height determining device characterized in that the drive cylinder (32) can be rotated from the outside of the head box without rotating the rotating shaft.   A worm gear (32b, 40) that rotates integrally with the drive cylinder (32) is provided at one end of the drive cylinder (32), and the worm gear (32b, 40) is formed in a part of the head box (12). The blind lifting / lowering height determining apparatus according to claim 1, wherein the blind lifting / lowering height determining apparatus can be operated from an opening.   A male screw (32a) is formed on the outer periphery of the drive cylinder (32), and the male screw (32a) is screwed with a female screw (34b) formed on the inner periphery of the slider (34). A guided portion (34a) is formed on the outer periphery of the slider (34), and the guided portion (34a) rotates relative to the guide portion (30b) formed on the inner periphery of the rotating cylinder (30). 3. The blind lifting height determining apparatus according to claim 1, wherein the engaging height is disengaged and movable in the axial direction.   A female screw is formed on the inner periphery of the rotating cylinder (30), and the female screw is screwed with a male screw formed on the outer periphery of the slider (34). A guided portion is formed, and the guided portion engages with a guide portion formed on the outer periphery of the drive cylinder (32) so as not to be relatively rotatable and movable in the axial direction. The apparatus for determining an elevation height of a blind according to claim 1 or 2.

Images