JP2011137316A - Blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blind which is equipped with a function of regulating a motion of the blind by an operation through an operation portion in detection of sagging of a hoisting and lowering cord, and which can prevent a failure from being caused even by the continuation of the operation of the operation portion after the regulation of the ascending/descending motion. <P>SOLUTION: A sagging-detection means 40 includes an input shaft 44 which is rotated integrally with a rotating shaft 26 capable of rotatively driving a winding drum 24, and a stopper 46 which can slide in a direction almost parallel to the rotational direction of the input shaft 44 and which regulates the rotation of the rotating shaft 26 by being engaged with the input shaft 44 when a lighting-control cord 32 is sagged. Upon application of torque equal to/higher than a predetermined level to the input shaft 44 by an operating physical force from an operation cord 30 when the input shaft 44 and the stopper 46 are engaged with each other, the input shaft 44 is elastically deformed and idly rotated with respect to the stopper 46, so as to temporarily permit the rotation of the rotating shaft 26. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a blind capable of detecting a slack of a cord that performs a lifting operation of the shielding material when the shielding material is raised and lowered.

  In the blinds, if the slack occurs in the cord that performs the lifting / lowering operation of the shielding material when the shielding material is lifted / lowered, it is not aesthetically pleasing, and a malfunction may occur due to the slack cord. It has been conventionally performed to detect slack.

  For example, in Patent Document 1, the upper end of the first shielding member is attached to the head box, the upper end of the second shielding member is attached to the intermediate bar attached to the lower end of the first shielding member, and the head box is suspended from the head box. One end of the light control cord is attached to the intermediate bar, and as the light control cord moves up and down, the intermediate bar rises and falls, and one end of the lift cord that hangs up and down from the head box is the second shielding material. The other end of the lifting / lowering cord is attached to the lower end, and the other end of the lifting / lowering cord is connected to the winding device provided in the head box so that winding and unwinding are possible. In a blind where the lower end of the second shielding material is raised and lowered after being wound and unwound, a slack detecting means for detecting slack of the dimming cord is provided, and when the slack detecting means detects slack To regulate the winding of the winding device code descending disclose.

  By controlling the winding to the winding device when the slack is detected in this way, the dimming cord from between the first shielding material folded and folded while the slack of the dimming cord is generated. Can be prevented from dandruff.

JP 2002-115474 A

  However, if the operator continues to operate the operation unit without noticing it even though the lifting operation of the cord is restricted to prevent the occurrence of slack, the operation unit and the slack detection means are overloaded. Therefore, there is a problem that it may cause a failure such as damage of each part.

  The present invention has been made in view of such a problem, and in a blind having a function of restricting the operation of the blind by an operation from the operation unit when the slack of the elevating cord is detected, the operation unit continues to be operated after the elevating operation is restricted. It is an object of the present invention to provide a blind that can prevent a failure from occurring.

In order to achieve the above-described object, the invention according to claim 1 is characterized in that the upper end of the shielding material is attached to the head box, and one end of the lifting / lowering cord hanging down from the head box is attached to the shielding material. Based on this operation, the elevating member that raises and lowers the shielding material rotates, and a slack detecting means for detecting slack of the elevating cord is provided in the head box, and the slack detecting means detects the slack of the elevating cord. In the blind in which the slack detection means regulates the rotation of the elevating member due to the operation from the operation unit,
An idle rotation means for interrupting the transmission of the operation force is provided in an operation force transmission path from the operation section to the looseness detection means, and the idle rotation means is in a state where the looseness detection means regulates the movement of the lifting member. When the operating force exceeds a predetermined value, transmission of the operating force is cut off.

According to a second aspect of the present invention, in the first aspect of the present invention, the slackness detecting means includes an input shaft that rotates integrally with a lifting member to which an operation force from the operation portion is transmitted, and substantially parallel to a rotation direction of the input shaft. A stopper that is slidable in any direction and is urged in a direction to engage with the input shaft, and engages with the input shaft when the lifting cord is slackened, and restricts rotation of the input shaft,
The idling means is provided on the input shaft.

According to a third aspect of the present invention, in the second aspect of the present invention, the input shaft includes a base portion that is coupled to the elevating member so as to be integrally rotatable, and an engaging portion that can be engaged with the stopper. ,
The idling means has an elastic portion that elastically connects the base portion and the engaging portion, and the elastic portion is deformed when a predetermined torque or more is applied to the input shaft in a state where the engaging portion and the stopper are engaged. Thus, the engaging portion and the stopper are disengaged.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a plurality of the elastic portions and the engaging portions are provided at predetermined angles around the base portion.

  The invention according to claim 5 is the one according to any one of claims 1 to 4, wherein the elevating member is a take-up drum in which the other end of the elevating cord is connected so as to be wound and unwound. It is characterized by having.

The invention according to claim 6 is the one according to any one of claims 1 to 4, wherein the shielding material is a first shielding material having an upper end attached to a head box, and a lower end of the first shielding material. An intermediate bar attached, and a second shielding member having an upper end attached to the intermediate bar,
The elevating member has a winding drum in which the other end of the cord whose one end is attached to the lower end of the second shielding member is connected so as to be wound and unwound,
The slack detecting means detects slack of a lifting / lowering cord having one end attached to an intermediate bar.

  According to the present invention, even when the operation of the operation unit is forcibly continued even though the slack detection means regulates the rotation of the elevating member, the idle rotation occurs when the operation force exceeds a predetermined value. Since the means interrupts the transmission of the operating force, each part is not subjected to a load more than a predetermined value, and damage to each part can be prevented.

  By forming the idling means in the slack detection means, it is possible to cancel the regulation of the rotation of the elevating member and allow the rotation of the elevating member. Damage to each part can be prevented. Further, the idling means can be easily configured without changing the design of existing parts other than the slackness detecting means.

  Even if the restriction is released by the idling means and the input shaft connected to the lifting member so as to rotate integrally is rotated, the stopper is biased in the direction of engaging with the input shaft. Engage. By repeating this engagement and disengagement, a signal is given to the operator, and the operator can recognize the abnormality. By providing a plurality of elastic portions and engaging portions around the base portion, the cycle of the engagement and non-engagement can be shortened to further clarify the signal to the operator.

It is a front view of the blind which concerns on the 1st Embodiment of this invention. It is a sectional side view showing the slack detection means which concerns on 1st Embodiment. It is a perspective view of the input shaft of the slack detection means which concerns on the 1st Embodiment of this invention. It is a sectional side view showing the state where the engaging part and stopper of the slack detecting means concerning a 1st embodiment were engaged. It is a sectional side view showing the state where engagement with the engaging part of the slack detection means concerning a 1st embodiment and a stopper was released temporarily. (A) is a side view showing a mode that the 1st shielding material of the blind concerning a 1st embodiment has risen to the middle, and (b) expresses the state where the 2nd shielding material was convoluted. It is a side view, (c) is a side view showing a state when the raising / lowering cord is further raised even after the second shielding material is folded. It is a front view of the blind which concerns on the 2nd Embodiment of this invention. It is a sectional side view showing the slack detection means which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 6 are views showing a first embodiment of a blind according to the present invention.

  In the figure, reference numeral 10 denotes a head box, which is fixed to a window frame, a wall surface or the like by a bracket 11.

  An upper end of an upper screen 14 that is a first shielding material is attached to the head box 10. Further, an intermediate bar 18 is attached to the lower end of the upper screen 14, and the upper end of the lower screen 16 as the second shielding material is attached to the intermediate bar 18, and the lower end of the lower screen 16 is a weight bar 20. These upper screen 14, intermediate bar 18, lower screen 16 and weight bar 20 constitute a shielding material. Each of the upper screen 14 and the lower screen 16 is a pleated screen that can be folded in a zigzag manner.

  A lifting / lowering cord 22 is suspended from the head box 10 so that it can be lifted / lowered. One end of the lifting / lowering cord 22 is connected to the weight bar 20 through each of the hooks of the upper screen 14, the intermediate bar 18, and the lower screen 16. Is done. The other end of the lifting / lowering cord 22 is connected to a winding drum 24 rotatably supported in the head box 10 so as to be wound and unwound.

  A rotary shaft 26 passes through the take-up drum 24 so as to rotate integrally. The rotary shaft 26 capable of rotating the take-up drum 24 is connected to a pulley 29 via a control unit 28. An operation cord 30 as an operation portion is hung on the pulley 29, and the operation cord 30 is suspended from one end (the right end in FIG. 1) of the head box 10. When the operation cord 30 is operated, the operating force is transmitted from the rotary shaft 26 to the winding drum 24, and the winding drum 24 rotates to wind or unwind the lifting cord 22, thereby removing the shielding material. A lifting operation is performed.

  Similarly, a dimming cord 32, which is another lifting cord, is suspended from the head box 10 so as to be lifted and lowered. One end of the dimming cord 32 is connected to the intermediate bar 18 through each ridge of the upper screen 14, and the other end of the dimming cord 32 is changed in direction in the head box 10 to the length of the head box 10. It extends along the direction, is led out from one end of the head box 10 via a stopper 34 in the head box 10, is suspended and connected to the operation knob 36.

  The head box 10 is provided with a slack detecting means 40 that detects slack of the dimming cord 32 and regulates the rotation of the winding drum 24 and the rotating shaft 26. As shown in FIG. 2, the slack detecting means 40 includes a case 42 fixed in the head box 10, an input shaft 44 that rotates integrally with the rotary shaft 26, and a rotation direction of the input shaft 44 in the case 42. A stopper 46 is slidable in a parallel direction, and a spring 48 is an elastic body that biases the stopper 46.

  As shown in FIGS. 2 and 3, the input shaft 44 is engaged with a stopper 44 and a base portion 44 a through which the rotation shaft 26 penetrates at the center thereof and is connected to the rotation shaft 26 so as to rotate integrally therewith. It has a joint portion 44b, and an elastic portion 44c as idle means for elastically connecting the base portion 44a and the engaging portion 44b.

  The elastic portion 44c is a substantially L-shaped elastic arm that extends in the outer diameter direction from the outside of the cylindrical base portion 44a and then extends in the circumferential direction, and the engaging portion 44b is formed of the elastic arm. Projecting from the outer peripheral surface of the tip to the outer peripheral side. Two sets of the engaging portion 44b and the elastic portion 44c are provided to face each other at a position separated by 180 degrees around the base portion 44a.

  An insertion passage 46a is formed in the stopper 46, and the dimming cord 32 is inserted through the insertion passage 46a. Further, the stopper 46 is formed with teeth 46 b that can be engaged with the engaging portion 44 b of the input shaft 44. The stopper 46 is urged by a spring 48 in a direction toward the one side surface 42 a of the case 42.

  In a normal state in which no slack occurs in the dimming cord 32, one side wall 46 d of the insertion passage 46 a is pressed leftward in FIG. 2 by the tension of the dimming cord 32, and the stopper 46 resists the biasing force of the spring 48. The teeth 46b of the stopper 46 are separated from the moving path of the input shaft 44 and are separated from the engaging portion 44b of the input shaft 44.

  On the other hand, when slack occurs in the dimming cord 32, the stopper 46 reaches a position where it comes into contact with the one side surface 42a by the biasing force of the spring 48, and the teeth 46b enter the moving path of the input shaft 44, 44 is engageable with the engaging portion 44b of the input shaft 44 and prevents the input shaft 44 from rotating in one direction.

  The operation of the blind configured as described above will be described. First, in the state shown in FIG. 1, the lifting / lowering cord 22 is almost completely unwound from the winding drum 24, and the weight bar 20 is at the lowermost end. Further, the dimming cord 32 is led out to some extent from the head box 10, and the intermediate bar 18 is at an intermediate height in the vertical direction. Accordingly, the upper screen 14 and the lower screen 16 have approximately the same exposure ratio.

  From this state, when the operation knob 36 at the right end in FIG. 1 of the head box 10 is pinched and the stopper 34 is released and moved downward or upward, one end of the dimming cord 32 moves upward or downward. The intermediate bar 18 is raised or lowered. In accordance with the movement of the intermediate bar 18, the exposure ratio between the upper screen 14 and the lower screen 16 changes, and the screen with the smaller exposure ratio is folded from the bottom accordingly.

  As shown in FIG. 6A, in the state where the upper screen 14 is not completely folded and exposed at a certain exposure rate, the operation cord 30 is set as shown in FIG. When the pulley 29 is operated in the direction of arrow A and rotated in the winding direction of the lifting / lowering cord 22 (in the direction of arrow B in FIG. 6B), as shown by the arrow C in FIG. Rises. As the weight bar 20 moves up, the lower screen 16 is initially folded from below, and the lower screen 16 is completely folded. Thereafter, when the operation of the operation cord 30 is further continued as shown by an arrow A in FIG. 6C, the intermediate bar 18 rises together with the weight bar 20 as shown by an arrow C in FIG. When the intermediate bar 18 rises, slack occurs in the light control cord 32 that has supported the intermediate bar 18.

  As a result, in the slack detection device 40, as shown in FIG. 2, the stopper 46, which is regulated so as to be separated from the input shaft 44 by the dimming cord 32, loses the tension of the dimming cord 32. 4, the stopper 46 is slid by the biasing force of the spring 48, and the teeth 46b of the stopper 46 have been rotated from the position indicated by the two-dot chain line to the position indicated by the solid line, as indicated by the arrow A in FIG. Engage with the engaging portion 44 b of the input shaft 44. As a result, the rotation of the input shaft 44 is restricted. Therefore, the rotation of the rotary shaft 26 integrally connected to the input shaft 44 is also restricted, and the winding drum 24 can no longer rotate in the winding direction of the lifting / lowering cord 22. The lifting operation of the weight bar 20 is forcibly stopped.

  However, after the rotation of the input shaft 44 is restricted in this way, if the operation cord 30 is continuously operated to rotate the winding drum 24 in the winding direction of the lifting / lowering cord 22, Torque in the rotational direction is applied. When the operating force exceeds a predetermined value, the elastic portion 44c is deformed from a state indicated by a two-dot chain line to a state indicated by a solid line as indicated by an arrow A in FIG. The engagement is released. As a result, the input shaft 44 is allowed to rotate until the engagement portion 44b disposed opposite to the released engagement portion 44b at a position spaced 180 degrees is engaged with the teeth 46b, and the input shaft 44 is rotated again. Be regulated. When the operation cord 30 is continuously operated, engagement and disengagement between the engaging portion 44b and the teeth 46b are repeated, and the rotation shaft 26 is in a state where the rotation of the rotation shaft 26 is restricted and allowed. Since the rotation is repeated every 180 degrees, the operator can finally notice the abnormality and stop the operation.

  At this time, when the engaging portion 44b of the input shaft 44 and the teeth 46b of the stopper 46 are engaged, a click feeling and / or a sound is generated, so that a signal is given to the operator. Abnormalities can be informed.

  As described above, even if the lifting operation of the lifting / lowering cord 22 is restricted but the operation is forcibly continued, the elastic portion 44c of the input shaft 44 is deformed and the engaging portion 44b, the stopper 46, Since the input shaft 44, the rotary shaft 26, and the take-up drum 24 can be idled with respect to the stopper 46 by temporarily releasing the engagement, each portion is not subjected to a predetermined load or more. Can prevent damage.

  Next, a second embodiment will be described based on FIGS.

  In this embodiment, the upper end of a screen 50 that is a shielding material is attached to the head box 10, and the lower end of the screen 50 is a weight bar 20. The screen 50 is a pleated screen as in the first embodiment.

  A lifting / lowering cord 22 is suspended from the head box 10 so as to be lifted / lowered, and one end of the lifting / lowering cord 22 is connected to the weight bar 20 through each hook of the screen 50. The other end of the lifting / lowering cord 22 is connected to the winding drum 24 so as to be wound and unwound after passing through the slack detecting means 40 in the head box 10. Since the configuration of the winding drum 24, the rotating shaft 26, the control unit 28, the pulley 29, and the operation cord 30 is the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIG. 8, the slack detection means 40 has the same configuration as that of the first embodiment except for the configuration of the stopper 46, and therefore only the stopper 46 will be described.

  In the first embodiment, the stopper 46 is provided with an insertion passage 46a through which the dimming cord 32 is inserted. In this embodiment, instead of the insertion passage 46a, an insertion hole 46c that is inserted in the vertical direction is formed. The elevating cord 22 is inserted in the insertion hole 46c in the vertical direction. The other end of the lifting / lowering cord 22 inserted through the insertion hole 46 c is connected to the winding drum 24.

  As shown in FIG. 8, when tension is applied to the lifting / lowering cord 22, the lifting / lowering cord 22 presses one side wall 46 e of the insertion hole 46 c, and abuts against one side surface 42 a of the case 42 against the urging force of the spring 48. Thus, the engaging portion 44b of the input shaft 44 and the teeth 46b of the stopper 46 are kept at a separated position.

  However, if the weight bar 20 comes into contact with an obstacle and cannot be lowered while the operation code 30 is operated and the screen 50 is lowered, the lifting code 22 is slackened. As a result, in the slack detection device 40, the lifting / lowering cord 22 does not press the one side wall 46e of the insertion hole 46c, so that the stopper 46 slides to the left in FIG. The teeth 46b of the stopper 46 and the engaging portions 44b of the input shaft 44 are engaged with each other. Thereby, the rotation of the input shaft 44 is restricted, the rotation of the winding drum 24 in the unwinding direction of the lifting / lowering cord 22 is restricted, and further loosening of the lifting / lowering cord 22 is prevented.

  Further, after the rotation of the input shaft 44 is restricted, when the operation cord 30 is continuously operated and the winding drum 24 is rotated in the unwinding direction of the lifting / lowering cord 22, the same as in the first embodiment. The elastic portion 44c is deformed and the engaging portion 44b gets over the teeth 46b, and these engagements are temporarily released, and the input shaft 44 is disposed opposite to the released engaging portion 44b at a position 180 degrees apart. The rotation is allowed until the engaged portion 44b engaged with the tooth 46b.

  As a result, even when the lowering operation of the lifting / lowering cord 22 is restricted but the operation is forcibly continued, the elastic portion 44c of the input shaft 44 is deformed and the engagement portion 44b and the stopper 46 are Since the input shaft 44, the rotary shaft 26 and the take-up drum 24 can be idled with respect to the stopper 46 by temporarily releasing the engagement, each part is not subjected to a predetermined load, and Damage can be prevented.

  In the above embodiment, the input shaft 44 is idled with respect to the stopper 46 by releasing the engagement between the input shaft 44 and the stopper 46 by the elastic portion 44c which is the idling means. However, the present invention is not limited to this. Alternatively, the idling means may release the coupling between the input shaft 44 and the rotating shaft 26 by an operating force that is greater than or equal to a predetermined value, thereby causing the rotating shaft 26 to idle with respect to the input shaft 44. .

  Moreover, in the above embodiment, the idling means is provided in the slackness detecting means, whereby the idling means can be easily configured without changing the design of existing parts other than the slackness detecting means. However, the present invention is not limited to this, and it is possible to provide the idling means in any one of the paths through which the operating force from the operation code 30 to the slackness detecting means 40 is transmitted. It is also possible to provide an idling means for interrupting transmission of the operating force when the operating force from the part exceeds a predetermined value.

  Further, three or more engaging portions 44b and elastic portions 44c of the input shaft 44 may be provided around the base portion 44a at predetermined angular intervals.

  The above-described configuration of the slack detection means 40 is merely an example, and any other configuration may be used.

10 Head box 14 Upper screen (first shielding material, shielding material)
16 Lower screen (second shielding material, shielding material)
18 Intermediate bar (shielding material)
22 Lifting code 24 Winding drum (lifting member)
26 Rotating shaft (elevating member)
30 Operation code (operation unit)
32 Dimming cord (elevating cord)
40 Slack detection means 44 Input shaft 44a Base 44b Engagement part 44c Elastic part (idling means)
46 Stopper 50 Screen (shielding material)

Claims (6)

The upper end of the shielding material (14, 16, 18, 50) is attached to the head box (10), and one end of the elevating cord (22, 32) hanging from the head box (10) so as to be able to be raised and lowered is the shielding material (14, 16). , 18, 50), and a lifting member (24, 26) for lifting and lowering the shielding material based on an operation from the operation unit (30) is rotated, and the head box (10) is lifted and lowered. A slack detecting means (40) for detecting slack in the cords (22, 32) is provided, and the slack detecting means (40) is operated when the slack detecting means (40) detects slack in the lifting cord (22, 32). In the blind that regulates the rotation of the elevating members (24, 26) by the operation from the unit,
An idle rotation means for interrupting transmission of the operation force is provided in an operation force transmission path from the operation section (30) to the looseness detection means (40). The idle rotation means includes a looseness detection means (40) and an elevating member (24). 26) A blind, characterized in that the transmission of the operation force is cut off when the operation force from the operation unit exceeds a predetermined value in a state where the motion of (26) is restricted. The slack detection means (40) includes an input shaft (44) that rotates integrally with the elevating members (24, 26) to which an operation force from the operation unit is transmitted, and a direction substantially parallel to the rotation direction of the input shaft (44). When the lifting / lowering cords (22, 32) are loosened, they are engaged with the input shaft (44) to be engaged with the input shaft (44). A stopper (46) for restricting rotation,
The blind according to claim 1, characterized in that the idling means is provided on an input shaft (44). The input shaft (44) has a base portion (44a) coupled to the elevating member (26) so as to be integrally rotatable, and an engaging portion (44b) that can be engaged with the stopper (46).
The idling means has an elastic part (44c) that elastically connects the base part (44a) and the engaging part (44b), and the engaging part (44b) and the stopper (46) are engaged. The elastic part (44c) is deformed when the torque exceeding a predetermined value is applied to the input shaft (44), and the engaging part (44b) and the stopper (46) are disengaged. Blinds.   The blind according to claim 3, wherein a plurality of the elastic portions (44c) and the engaging portions (44b) are provided around the base portion (44a) at predetermined angles.   The said raising / lowering member has a winding drum (24) with which the other end of the said raising / lowering cord (22) is connected so that winding and unwinding are possible, The Claim 1 thru | or 4 characterized by the above-mentioned. Blinds. The shielding material includes a first shielding material (14) having an upper end attached to the head box (10), an intermediate bar (18) attached to a lower end of the first shielding material (14), and an intermediate bar (18). A second shielding material (16) having an upper end attached to
The elevating member has a winding drum (24) in which the other end of the cord having one end attached to the lower end of the second shielding member (16) is connected so as to be wound and unwound,
The blind according to any one of claims 1 to 4, wherein the slack detecting means (40) detects slack of a lifting / lowering cord (32) having one end attached to the intermediate bar (18).

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