JP4745182B2 - blind - Google Patents

Description

  The present invention relates to a blind that includes an elevating cord and a dimming cord and that can change the exposure ratio of a first shielding material and a second shielding material.

  Conventionally, what was described in patent document 1 is known as this kind of blind. In the device described in Patent Document 1, a slack detecting means for detecting slack of the dimming cord is provided, and when the slack detecting means detects slack of the dimming cord, the lifting operation of one end of the lifting / lowering cord is regulated. It is like that. Specifically, the other end of the lifting / lowering cord is connected to a winding device provided in the head box so as to be wound and unwound, and when the slack detecting means detects slack of the light control cord, the winding device It is possible to prevent the situation where the dimming cord dandruff from between the first shielding material that is folded up by raising the blind while the slack of the dimming cord is generated is restricted. Yes.

Japanese Patent No. 3691373

  However, the above-described conventional configuration is such that the other end of the lifting / lowering cord is connected to the winding device so that it can be wound and unwound, so that the other end of the lifting / lowering cord is suspended from the head box via a stopper. It cannot be applied to a so-called cord type configuration that forms a portion.

  Thus, when slack occurs in the dimming cord in the cord type, when the operation of raising one end of the lifting / lowering cord is performed, the lower end of the second shielding member raises the intermediate bar together, The load of the intermediate bar and the first shielding material is also applied to the lifting / lowering cord, and there is a problem that each part is overloaded and the manufacturable dimensions are limited.

  The present invention has been made in view of such a problem, and its object is to provide a blind capable of preventing slack and overload of a dimming cord in a cord type blind and increasing the manufacturable size. To do.

In order to achieve the above-described object, according to the first aspect of the present invention, the upper end of the first shielding member is attached to the head box, and the upper end of the second shielding member is attached to the intermediate bar attached to the lower end of the first shielding member. One end of the lifting / lowering cord attached to the head box is attached to the lower end of the second shielding material, and one end of the dimming cord hanging from the head box is attached to the intermediate bar. The lower end of the second shielding member is raised and lowered by moving up and down, and the intermediate bar is raised and lowered by raising and lowering one end of the dimming cord so that the first shielding member and the second shielding member are exposed. In the blind where the proportion changes,
The other end of the lifting / lowering cord is suspended from the head box via the first stopper to form a first operating portion, and the other end of the dimming cord is suspended from the head box via the second stopper. A slack detecting means is provided for detecting slack of the dimming cord, and the slack detecting means includes a third stopper capable of engaging a lifting / lowering cord different from the first stopper, and the slack of the dimming cord When this occurs, the third stopper locks the lifting / lowering cord and disables the operation of the first operation portion.

According to a second aspect of the present invention, the slack detecting means according to the first aspect is characterized in that the dimming cord hanging from the head box is wound in the head box, and the slide is slidable together with the guide. a lifting cord and a lockable third stopper by said guide and slack dimming code, characterized in that the third stopper slides to lock the lift cord.

  The invention according to claim 3 is characterized in that the guide according to claim 1 is urged by the urging means in a sliding direction in which the third stopper locks the elevating cord.

  According to the present invention, when the slack of the dimming cord occurs, the slack detecting means locks the lift cord and disables the operation of the first operation portion. The slack of the light control cord can be prevented. Thereby, the overload to the first stopper or the like due to the load of the intermediate bar and the first shielding material acting on the lifting / lowering cord can be reduced, and the manufacturable dimensions can be increased.

  According to the second aspect of the present invention, when slack occurs in the dimming cord, the tension of the dimming cord does not act on the guide around which the dimming cord is wound. 3 stoppers can lock the lifting cord.

  According to the third aspect of the present invention, when the tension is no longer applied to the guide, the third stopper can be moved together with the guide in the direction of locking the lifting / lowering cord by the biasing means.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 8 are views showing an 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. An intermediate bar 18 is attached to the lower end of the upper screen 14, and the upper end of the lower screen 16, which is a second shielding material, is attached to the intermediate bar 18. A lower end of the lower screen 16 is a weight bar 20. For example, the upper screen 14 and the lower screen 16 are each formed of a pleated screen that can be folded in a zigzag shape.

  A plurality of elevating cords 22 are suspended from the head box 10 so as to be able to move up and down, and one end of the elevating cord 22 is inserted through each ridge of the upper screen 14, each intermediate bar 18 and each ridge of the lower screen 16, and the weight bar 20. Connected to

  The other end of the lifting / lowering cord 22 is changed in direction in the head box 10 and extends along the longitudinal direction of the head box 10, and is connected to one end of the head box 10 via a stopper 24 as a first stopper in the head box 10. The head box 10 is led out from (the right end in FIG. 1), is suspended from one end of the blind (the right end in FIG. 1), and is connected to the operation knob 26 to constitute a first operation unit.

  Similarly, a plurality of dimming cords 32 are suspended from the head box 10 so as to be able to move up and down so as to overlap the elevating cords 22 in FIG. Inserted and connected to the intermediate bar 18. The other end of the dimming cord 32 is changed in direction in the head box 10 and extends along the longitudinal direction of the head box 10, and the head box 10 has a stopper 34 as a second stopper in the head box 10. The head box 10 is led out from the other end (left end in FIG. 1), is suspended from the other end (left end in FIG. 1) of the blind, and is connected to the operation knob 36 to constitute a second operation unit.

  In the head box 10, a cord guide 38 is installed for introducing the lifting / lowering cord 22 and the dimming cord 32 into the head box 10 and changing the direction. As shown in FIGS. 2 to 4, the code guide 38 is formed with insertion holes 38a and 38b through which the dimming cord 32 and the lifting / lowering cord 22 pass, and in the vicinity above the insertion holes 38a and 38b. A plurality of rollers 38c and 38d are pivotally supported. The lifting / lowering cord 22 is guided rightward by the roller 38d after passing through the insertion hole 38b. The dimming cord 32 is guided by the roller 38c after passing through the insertion hole 38a.

  Further, a slack detecting means 40 is provided between the cord guide 38 provided on the most leading side of the lifting / lowering cord 22 in the head box and the stopper 24. The slack detection means 40 includes a case 42 composed of a lower case and an upper case fixed to the head box 10, a slide member 44 that can slide in the longitudinal direction of the head box 10 in the case 42, and a slide member 44. The guide 46 is pivotally supported with the pivot shaft up and down, the sandwiching roller 48 pivotally supported by the slide member 44 with the pivot shaft forward and backward, and formed on the upper case so as to face the sandwich roller 48. As a biasing means for biasing the slide member 44 toward the lifting / lowering cord lead-out end, a receiving portion 50 protruding downward, a gear portion 52 formed in the lower case and capable of meshing with the clamping roller 48 Spring 54.

  All the lifting cords 22 pass through the case 42 of the slack detecting means 40 and pass between the clamping roller 48 and the receiving part 50 in the case 42. These sandwiching rollers 48 and the receiving portion 50 constitute a third stopper for locking the lifting / lowering cord 22. The spring 54 urges the slide member 44 to which the guide 46 is attached in the direction in which the pinching roller 48 of the third stopper and the receiving portion 50 engage the lifting cord 22.

  The dimming cord 32 located closest to the lead-out end side of the lifting / lowering cord 22 passes through the slack detecting means 40 and is wound around the guide 46, and then the direction of the cord guide 38 is changed by the roller 38c. Then, it passes through the insertion hole 38a and hangs down. As a result, the tension of the dimming cord 32 acts on the guide 46.

  In a normal time when the dimming cord 32 is not slack, the tension of the dimming cord 32 is set to be larger than the urging force of the spring 54, and the slide member 44 is urged to the left side in the drawing to hold the clamping roller 48. As shown in FIG. 2 to FIG. 4, it is positioned at a position that is farther from the receiving portion 50.

  The operation of the blind configured as described above will be described. First, in the state shown in FIG. 1, one end of the lifting / lowering cord 22 is lowered, and the weight bar 20 is at the lowermost end. The other end of 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.

  In the state shown in FIG. 1, when the operation knob 36 at the other end (the left end in FIG. 1) of the head box 10 is pinched to release the stopper 34 and move it downward or upward, the dimming cord 32 One end can move up or down to raise or lower the intermediate bar 18. 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.

  In order to raise the blind completely from a state in which the upper screen 14 is not completely folded as shown in FIG. 1 and is exposed at a certain exposure rate, the operation knob 26 is operated, and the stopper 24 is moved. Release and move down. As a result, one end of the lifting / lowering cord 22 moves upward, and the weight bar 20 rises. As the weight bar 20 is raised, the lower screen 16 is initially folded from below, and when the lower screen 16 is completely folded, the intermediate bar 18 is lifted as shown in FIG. At this time, the light control cord 32 supporting the intermediate bar 18 is slackened.

  Thereby, in the slack detection device 40, the tension acting on the guide 46 is released. Then, the slide member 44 to which the guide 46 is attached receives the urging force of the spring 54, and the sandwiching roller 48 receives the force in the same direction from the lifting / lowering cord 22 that moves in the outlet direction. As shown in FIG. 3, the clamping roller 48 slides in a direction approaching the receiving portion 50. The sandwiching roller 48 meshes with the gear portion 52, and the sandwiching roller 48 sandwiches and lifts the lifting / lowering cord 22 together with the receiving portion 50. Thus, the movement of the lifting / lowering cord 22 is prohibited, and the operation knob 26 cannot be operated.

  In order to release this inoperability, the operation knob 36 is operated to release the stopper 34, and one end of the light control cord 32 is moved upward to raise the intermediate bar 18. At this time, since the tension of the dimming cord 32 acts on the guide 46 of the slack detecting means 40, the guide 46 and the slide member 44 return to the state shown in FIGS. 2 to 4, and the holding roller 48 is separated from the receiving portion 50. The elevating cord 22 can be moved. When the operation knob 26 is operated with the upper screen 14 completely folded and the stopper 24 is released and moved downward, the weight bar 20 rises and the upper screen 14 and The lower screen 16 is also folded. Since the dimming cord 32 is not slacked in the folded state, it does not swell from the folded upper screen 14 and does not deteriorate the appearance.

  Alternatively, before the operation knob 26 is operated, the operation knob 36 is operated from the state shown in FIG. 1 to raise one end of the dimming cord 32 so that the intermediate bar 18 is completely raised in advance, and then lifts and lowers. When the one end of the cord 22 is raised, the lifting operation of the blind ends when the weight bar 20 reaches the intermediate bar 18, and therefore the blind can be raised without the slack detection means 40 operating.

  On the other hand, when lowering one end of the lifting / lowering cord 22, the clamping roller 48 is kept away from the receiving portion 50, so that the slack detecting means 40 does not operate and the movement of the lifting / lowering cord 22 is prohibited. It will never be done.

  Thus, in this embodiment, since the slack detecting means 40 directly locks the lifting / lowering cord 22, when the slack of the dimming cord 32 occurs, the movement of the lifting / lowering cord 22 can be prohibited.

  Further, in the situation where the load of the intermediate bar is applied to the lifting / lowering cord as shown in FIG. 5, the lifting / lowering cord 22 is locked by the slack detecting means 40, so that the stopper 24 and the like are prevented from being overloaded. be able to. As a result, the manufacturable dimensions can be increased.

  In this embodiment, the slide member 44 is biased by the spring 54 in the direction in which the lifting / lowering cord 22 is locked. However, the sandwiching roller 48 can move together with the sliding member 44 as the lifting / lowering cord 22 moves. If so, the spring 54 may be omitted.

It is a front view of the blind concerning embodiment of this invention. FIG. 2 is a partially enlarged plan view of the head box in FIG. 1 in a normal state (excluding the upper case of the slack detection means). It is sectional drawing seen along the 3-3 line of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a front view showing the state which operated the raising / lowering cord from the state of FIG. 1, and the intermediate bar lifted. FIG. 3 is a diagram corresponding to FIG. 2 when slack of the dimming cord occurs. FIG. 4 is a diagram corresponding to FIG. 3 when slack of the dimming cord occurs. FIG. 5 is a diagram corresponding to FIG. 4 when slack of the dimming cord occurs.

Explanation of symbols

10 Head box 14 Upper screen (first shielding material)
16 Lower screen (second shielding material)
18 Intermediate bar 22 Lifting cord 24 Stopper (first stopper)
26 Operation knob (first operation part)
32 Dimming cord 34 Stopper (second stopper)
36 Operation knob (second operation part)
40 Slack detecting means 46 Guide 48 Nipping roller (third stopper)
50 Receiving part (third stopper)
54 Spring (biasing means)

Claims (3)

The upper end of the first shielding member (14) is attached to the head box (10), and the upper end of the second shielding member (16) is attached to the intermediate bar (18) attached to the lower end of the first shielding member (14). One end of the lifting / lowering cord (22) hanging down from the head box (10) is attached to the lower end of the second shielding member (16), and the dimming cord (32) hanging down from the head box (10) Is attached to the intermediate bar (18), and the lower end of the second shielding member (16) is raised and lowered by raising and lowering one end of the raising and lowering cord (22). In the blind in which the exposure ratio of the first shielding material (14) and the second shielding material (16) is changed so that the intermediate bar (18) is raised and lowered by moving up and down,
The other end of the lifting / lowering cord (22) is suspended from the head box via the first stopper (24) to form the first operating portion (26), and the other end of the dimming cord (32) is the second stopper (34). ) To form a second operation part (36) hanging from the head box, provided with a slack detecting means (40) for detecting slack of the dimming cord (32), and a slack detecting means (40). Is provided with a third stopper (48, 50) capable of locking an elevating cord (22) different from the first stopper (24), and when the light adjusting cord (32) is loosened, the third stopper (48, 50) locks the lifting / lowering cord (22) and disables the operation of the first operating portion (26). The slack detecting means (40) is capable of sliding along with the guide (46) around which the dimming cord hanging from the head box is wound, and capable of engaging the lifting cord with the slide. The blind according to claim 1, further comprising: a third stopper (48, 50), wherein when the dimming cord is loosened, the guide slides and the third stopper locks the lifting cord.   The blind according to claim 2, wherein the guide is biased by a biasing means (54) in a sliding direction in which the third stopper locks the lifting cord.

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