JP4419121B2 - Electric assist blind - Google Patents

Description

  The present invention relates to an electrically assisted blind that assists a manual lifting operation of a blind by an electric motor.

  Since wooden venetian blinds and high window venetian blinds that are manually operated are heavy, the lifting operation is lightened using a reduction gear. In the case of a relatively small blind, if a reduction gear is used, even a powerless user does not have trouble with the blind lifting operation. However, when the size of the blind becomes large, it is difficult for a powerless user to perform the blind lifting operation even if the reduction gear is used.

  As a solution to this problem, Japanese Patent Laid-Open No. 2002-309868 proposes an electric assist blind that assists the manual lifting operation of the blind with an electric motor. The electric assist blind pulls the operation cord on the operation pulley to rotate the operation pulley, transmits the rotation of the operation pulley to the lifting mechanism via the reduction gear, and rotates the lifting mechanism to tilt and lift the slat. It is a blind, and an electric motor is directly connected to the output shaft of the reduction gear, and an up / down detecting switch for detecting that the operation cord is pulled in the up / down direction is provided. When the up detection switch is turned on, the electric motor The electric motor rotates in the descending direction when it rotates in the ascending direction and the descending detection switch is turned on.

In this electric assist blind, it is necessary to turn off the electric motor so that the up / down detection switch is not turned on when the operation cord is rotated to adjust the inclination of the slat and the operation pulley is rotated.
JP 2002-309868 A

  An object of the present invention is an electric assist blind capable of manually lifting and lowering relatively heavy blinds such as wooden venetian blinds and high window venetian blinds even by a weak user, and adjusting the inclination of the slats Therefore, when the operation cord is pulled to rotate the operation pulley, the up / down detection switch is not turned on without turning off the electric motor.

  In order to achieve the above object, the means adopted by the present invention is to pull an operation cord hung on an operation pulley provided in the head box, rotate the operation pulley, transmit the rotation of the operation pulley to the drive shaft of the lifting mechanism, In the blind of the type in which the drive shaft is rotated and the slats are tilted and raised, electric assist means including an electric motor connected to the drive shaft directly or through a reduction gear is provided, and the operation pulley is lifted from the basic position. The electric motor is rotated in the slat ascending direction when rotated in a direction more than a predetermined angle, and the electric motor is rotated in the slat descending ascending direction when rotated in the descending direction by a predetermined angle or more.

  Since the electric assist blind according to the present invention is a method of manually assisting the raising and lowering operation of the slats with an electric motor, even if the user is weak, it is easy to use relatively heavy blinds such as wooden blinds and large blinds for high windows. It is possible to go up and down. In addition, since the electric assist means of the present invention does not start the electric motor during the slat tilt adjustment, the slat tilt adjustment can be performed without turning off the power. Furthermore, since this electric assist means can be retrofitted to the existing manual blind by unitizing, the existing manual blind can be easily modified to the electric assist blind.

  In order to facilitate unitization, the electric assist means includes a supporter supported by the head box, a disk loosely fitted on the rotating shaft of the operation pulley, a spring that presses the disk against the operation pulley, and a dog provided on the disk. The first and second switches that are engaged with the dog and operated, and when the disc rotates together with the operation pulley in the upward direction by a predetermined angle or more, the dog operates the first switch to move the electric motor in the slat upward direction. When the disk is rotated and the disc rotates together with the operating pulley in the descending direction by a predetermined angle or more, the dog preferably operates the second switch to rotate the electric motor in the slat descending direction. The spring is interposed between a cap and a disk provided at the tip of the rotating shaft of the operation pulley protruding from the head box.

  The supporter has a first return spring that returns a disk that rotates more than a predetermined angle in the upward direction to a position immediately before engagement with the first switch, and a disk that rotates more than a predetermined angle in the downward direction to a position immediately before engagement with the second switch. It is desirable to provide a second return spring for returning so that the electric motor stops rotating as soon as the operation cord is released.

  The predetermined angle in the ascending and descending direction from the basic position of the operating pulley is set to a rotation angle at which the operating pulley rotates the slats from the horizontal position to the tilt limit in the ascending and descending directions. The second switch operates when the dog rotates in a certain angle descending direction of 20 ° or less beyond a predetermined angle, and the second switch operates when the dog rotates in a certain angle descending direction of 20 ° or less than a predetermined angle in the descending direction. It is preferable to set so. It is desirable that the first and second switches are attached to the supporter so that the predetermined angular position that operates by engaging with the dog can be adjusted.

The blind of the present invention will be described based on an embodiment shown in the drawings.
1 and 2 are a partial cross-sectional plan view and a front view showing a main part of the electric assist blind according to the embodiment of the present invention, and FIG. 3 is a rear view of the supporter.

  As shown in FIGS. 1 and 2, in a head box 2 of a blind 1, an elevating mechanism 3 having a winding drum, an output side reduction gear 5 directly connected to a drive shaft 4 of the elevating mechanism, the gear and a cup The electric motors 7 connected via the ring 6 are arranged in a row. A rotating shaft 9 of the input side reduction gear 8 that meshes with the output side reduction gear 5 protrudes in front of the head box 2. Outside the head box 2, an operation pulley 10 is attached to the rotary shaft 9 so as to rotate integrally, and an operation cord 11 is hung on the operation pulley 10.

  When one of the operation cords 11 is pulled and the operation pulley 10 is rotated in one direction, the drive shaft 4 of the elevating mechanism rotates in a direction in which the slats are inclined and lifted, and the other operation cord 11 is pulled and the operation pulley 10 is moved. When rotated in the reverse direction, the drive shaft 4 of the elevating mechanism rotates in the direction in which the slats tilt and descend downward. At this time, the electric motor 7 is also rotated manually.

  A disk 12 adjacent to the front side of the operation pulley 10 is fitted on the rotary shaft 9 so as to be capable of mutual rotation. A cap 13 is fixed to the tip of the rotary shaft 9, and a spring 14 that presses the disk 12 against the operation pulley 10 is interposed between the cap 13 and the disk 12. The disk 12 comes into contact with the ball 15 charged in the operation pulley 10. The disk 12 is provided with a dog 16 projecting in the radial direction and a bumper 17 projecting to the front side.

  A supporter 18 that covers the lower front half of the disk 12 is attached to the head box 2 via bolts or the like. As shown in FIG. 3, the position of the first switch 19 that engages with the dog and operates when the disc rotates more than a predetermined angle from the basic position to the slat ascending side on the left or right side of the supporter 18 can be adjusted. When the disc rotates more than a predetermined angle from the basic position to the lower side of the slat, the second switch 20 that engages and operates with the dog is fixed to the left and right other side so that the position can be adjusted.

  On the back surface of the supporter 18, first and second spring chambers 23 and 24 are provided on the left and right sides, and the first and second return springs 21 and 22 are disposed therein. The first return spring 21 is engaged with the bumper to return the disk to a predetermined upward angle position when the disk rotates from the basic position to the slat upward side by a predetermined angle or more. The second return spring 22 is engaged with the bumper when the disk rotates from the basic position to the slat lowering side by a predetermined angle or more, and tries to return the disk to the predetermined lowering angular position.

  Next, slat inclination adjustment and elevating operation will be described with reference to a schematic diagram 4 showing the operation. When the slat is in the horizontal state, as shown in FIG. 4A, the disk 12 is arranged so that the dog 16 and the bumper 17 are at the apex, and the disk 12 is set as the basic position. Since the disk 12 is pressed against the operation pulley 10 by a spring and frictionally contacts the operation pulley 10 via a ball, the disk 12 rotates integrally with the operation pulley 10 unless rotation is stopped.

  As shown by an arrow B in FIG. 4B, the disk 12 that is rotated integrally with the operation pulley 10 when the operation cord is pulled is moved from the basic position in FIG. The dog 16 does not engage the first switch 19 until it rotates 90 °, so the electric motor does not start. The angle range in which the dog 16 rotates from the basic position to a predetermined angle in the slat ascending direction is a rotation angle at which the operation pulley rotates the slat from the horizontal position to the tilting limit in the ascending direction. It is. In this region, even if the electric motor is not turned off, there is no possibility that the electric motor is started and the slat rises during the slat inclination adjustment.

  As shown by an arrow C in FIG. 4 (c), the disk 12 that is further pulled with the operation cord and rotates integrally with the operation pulley 10 has an angle of 20 ° or less after exceeding a predetermined angle toward the slat ascending side. When rotated by 10 °, the dog 16 engages with the first switch 19, so that the electric motor is activated and rotates in the slat rising direction. Therefore, if the operation cord is continuously pulled, the disk 12 is prevented from rotating by the first switch 19 and slips. However, since the operation pulley 10 rotates as it is, the slat rises. Since this raising operation is supported by the electric motor, the burden on the user is greatly reduced. A rotation range of 20 ° or less after the dog 16 exceeds a predetermined angle in the slat rising direction is a slat rising operation region.

  Therefore, when the operation code is released, the return spring 21 reverses the disk 12 via the bumper 17 to return to the state shown in FIG. 4B, so that the rotation of the electric motor stops. Here, when the operation cord is pulled again, the dog 16 immediately engages with the first switch 19, so that the electric motor rotates instantaneously and the slat rises.

  As shown by an arrow D in FIG. 4 (d), the disk 12 that is pulled together with the operation cord 10 and rotated integrally with the operation pulley 10 has a predetermined angle from the basic position in FIG. The electric motor does not start until the dog 16 and the second switch 20 are not engaged until rotating. The angle range in which the dog 16 rotates from the basic position to a predetermined angle in the slat descending direction is a rotation angle at which the operation pulley rotates the slat from the horizontal position to the tilt limit in the descending direction. It is. In this region, even if the electric motor is not turned off, there is no possibility that the electric motor is started and the slat is lowered during the slat inclination adjustment.

  As shown by an arrow E in FIG. 4 (e), the disk 12 that is further pulled with the operation cord and rotates integrally with the operation pulley 10 has an angle of 20 ° or less exceeding a predetermined angle toward the slat descending side. When rotated, the dog 16 engages with the second switch 19, so that the electric motor is activated and rotates in the slat rising direction. Therefore, when the operation code is continuously pulled, the disk 12 is prevented from rotating by the second switch 20 and slips, but the operation pulley 10 rotates as it is, and the slat is lowered. A rotation range of 20 ° or less after the dog 16 exceeds a predetermined angle in the slat descending direction is a slat descending operation region.

  Therefore, when the operation code is released, the return spring 21 reverses the disk 12 via the bumper 17 to return to the state shown in FIG. 4B, so that the rotation of the electric motor stops. When the operation cord is pulled again, the dog 16 is immediately engaged with the second switch 20, so that the electric motor is instantaneously rotated and the slat is lowered.

Partial cross-sectional plan view showing the main part of the electric assist blind of the present invention embodiment, The principal part front view of the electrically assisted blind of FIG. The rear view of the supporter of FIG. 1 is a schematic diagram showing the operation of the electric assist blind of FIG. 1, (a) is a basic position, (b) is a slat ascending adjustment region, (c) is a slat ascending operation region, and (d) is a slat descending side. (C) shows the slat lowering operation area.

Explanation of symbols

1: Blind 2: Head box 3: Elevating mechanism 4: Drive shaft 5: Reduction gear (output side)
6: Electric motor 7: Coupling 8: Reduction gear (input side)
9: Rotating shaft 10: Operation pulley 11: Operation code 12: Disc 13: Cap 14: Spring 15: Ball 16: Dog 17: Bumper 18: Supporter 19: First switch 20: Second switch 21: First return spring 22 : Second return spring 23: first spring chamber 24: second spring chamber

Claims (5)

In the blind of the method of rotating the operation pulley by pulling the operation cord hung on the operation pulley, transmitting the rotation of the operation pulley to the drive shaft of the lifting mechanism, and rotating the drive shaft to tilt and lift the slat, When the electric motor coupled to the drive shaft directly or through a reduction gear and the operation pulley rotate from the basic position by a predetermined angle or more in the ascending direction, the electric motor is rotated in the ascending direction of the slat and lowered. An electric assist blind comprising: an electric assist means configured to rotate the electric motor in a descending and ascending direction of the slats when the electric motor rotates by a predetermined angle or more in a direction. The disc is loosely fitted to the rotating shaft of the operating pulley and is adjacent to the front side of the operating pulley, and fixed to the tip of the rotating shaft. A cap that is provided between the cap and the disk and presses the disk against the operation pulley, a dog provided on the disk, a supporter supported by the head box, and the supporter. And when the disc rotates together with the operation pulley in a rising direction by a predetermined angle or more, the dog operates the first switch to move the electric motor. When the disc rotates together with the operation pulley in the descending direction by a predetermined angle or more, the dog operates the second switch to rotate the electric motor in the slat descending direction. Electric assist blind. The supporter has a first return spring that returns a disk that rotates more than a predetermined angle in the upward direction to a position immediately before engagement with the first switch, and a disk that rotates more than a predetermined angle in the downward direction before the engagement with the second switch. The electric assist blind according to claim 1, further comprising a second return spring that returns to the back. The electric assist blind according to claim 1 or 2, wherein the first and second switches are attached to the supporter so as to be able to adjust a predetermined angular position that operates by engaging with the dog. 4. The predetermined angle in the upward and downward directions of the operating pulley is set to a rotation angle at which the operating pulley rotates the slat from a horizontal position to a tilt limit in the upward and downward directions. The electric assist blind according to one. The first switch is activated when the dog rotates in an upward direction of an angle of 20 ° or less beyond a predetermined angle in the upward direction, and the second switch is an angle of 20 ° or less in excess of a predetermined angle in the downward direction. The electric assist blind according to any one of claims 1 to 4, wherein the electric assist blind operates when rotating in a descending direction.

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