JP2545994Y2 - Safety stop for shutter blinds - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a shutter blind which raises and lowers a number of slats to open and close an opening and tilts the slats to block light and ventilate the air.

[0002]

2. Description of the Related Art Conventionally, a blind of this type is composed of a number of slats connected by a link mechanism. An opening is opened and closed by raising and lowering the slat, and the slat is tilted with the opening closed. Shade and ventilate. The lifting and lowering of the slats is performed by a moving body attached to a chain which is connected to the lowermost end of the link mechanism and is mounted between a driving sprocket attached to the main shaft and a driven sprocket arranged below the opening. Driving is performed, and tilting of the slat is performed by a slat tilting mechanism connected to the uppermost portion of the link mechanism and installed coaxially with the main shaft.
The present applicant has previously disclosed such a blind lifting and lowering device as disclosed in Japanese Utility Model Laid-Open No. 61-78993 and Japanese Utility Model Application No.
No. 146924.

[0003]

However, in the blind having such a structure, even if an obstacle intervenes during the closing operation of the blind and the slat at the lowermost end collides with the obstacle, the blind has a problem. Since the moving body attached to the slat further drives the slat in the closing direction, there is a possibility that the slat, the slat mounting portion, an obstacle, or the like may be damaged. The purpose of the present invention is to solve such a problem.The purpose of the present invention is to stop the lowering of the slat when the load on the slat exceeds a predetermined value due to the collision of the slat with an obstacle during the closing, etc. An object of the present invention is to provide a safety device for shutter blinds that does not damage slats or obstacles.

[0004]

In order to achieve the above object, the present invention has the following arrangement. That is, the present invention
A frame, a main shaft laterally mounted in an upper horizontal frame of the frame and connected to a motor, a drive sprocket mounted on the main shaft, and a driven sprocket disposed at a lower portion of the frame; A flexible transmission member such as a chain or a toothed belt mounted between the two sprockets, and a vertically movable frame disposed between the left and right vertical frames of the frame to cover an opening formed by the frame. A plurality of slats, a link mechanism that continuously supports the plurality of slats and enables the slats to tilt, and is attached to the flexible transmission member and connected to one end of the link mechanism. A moving body that raises and lowers a large number of slats by rotating the main shaft, and a slat tilting mechanism that is provided coaxially with the main shaft and that is connected to the link mechanism and tilts each slat by rotating the main shaft. Prepared A safety stop device for a shutter blind, wherein the safety stop device contacts a limit switch for stopping driving of a slat, a spring member connected to the flexible transmission member, and the flexible transmission member, And an actuating member that moves by the flexure of the flexible transmission member to actuate the limit switch.

[0005]

In the closing operation of the blind, if the slat at the lowermost end collides with an obstacle and a load exceeding a predetermined level is applied to the slat, the moving body is prevented from moving in the closing direction. However, since the driving sprocket connected to the main shaft further rotates in the direction to close the blind, the flexible transmission member moves further against the spring force of the spring member. Due to the movement, the flexible transmission member is bent, and the bending causes the operating member to abut on the limit switch, thereby operating the limit switch to stop the movement of the blind. As a result, the rotation of the driving sprocket is stopped, the movement of the moving body is stopped without exerting an excessive force on the lowermost slat, and there is no possibility that the lowermost slat, the slat mounting portion, or an obstacle is damaged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of the shutter blind of the present invention, and FIG. 2 is a perspective view of the shutter blind of the present invention.

The frame 1 includes an upper horizontal frame 1A, a lower horizontal frame 1B, and left and right vertical frames 1C. An opening 2 is formed by the upper horizontal frame 1A, the lower horizontal frame 1B, and the left and right vertical frames 1C. . Between the left and right vertical frames 1C, a blind 3 composed of a large number of slats 5 is arranged so as to be able to move up and down along guide grooves 1D provided in the vertical frame 1C. A mounting piece 24 is fixed in the upper horizontal frame 1A, and the main shaft 9 is rotatably supported along the horizontal frame 1A by the mounting piece 24. The drive sprocket 7 is mounted on both ends of the main shaft 9. Are arranged, and are driven together with the driving of the main shaft 9. The main shaft 9 is driven by a motor (not shown) arranged in the upper horizontal frame 1A.

The left and right vertical frames 1C rotatably support a shaft 11A below the vertical frame 1C, and the driven sprocket 11 is disposed on the shaft 11A. A chain 15 as a flexible transmission member is mounted between the two sprockets 7 and 11. One end of the chain 15 is attached to the upper part of a moving body 17 guided vertically vertically by a roller 17A in the vertical frame 1C, and the other end is connected to the moving body 17.
Is connected to the other end of a spring member 18 having one end attached thereto, and the movement of the chain 15 drives the moving body 17 in the vertical direction. The moving body 17 has an L-shaped supporting portion 17B at an intermediate portion in the lateral direction of the vertical frame 1C. Reference numeral 19 denotes a lever. The lever 19 supports the plurality of slats 5 at an intermediate portion thereof so as to be tiltable and vertically movable along the guide groove 1D of the vertical frame 1C. The ends are connected to each other by a link 20 to form a link mechanism 21. The lever 19 located at the uppermost end is provided with a known slat tilting mechanism 22.
And a lever 19 located at the lowermost end is tiltably attached to a support portion 17B formed on the moving body 17. Reference numeral 23 denotes a limit switch.
3 is attached to a mounting piece 24 fixed to the upper horizontal frame 1A. An inverted operating member 25 is further attached to the mounting piece 24 by a shaft 26 so as to be swingable in the vicinity of the driving sprocket 7.
5 is the chain 15 and the other is the limit switch 2.
3 is in contact. Limit switch 2 for actuating member 25
The other end of a spring member 29, one end of which is attached to a pin 27 fixed to the mounting piece 24, is connected to the distal end of the third side. To the spring force.

Next, the operation of the safety stop device of the present invention will be described. When the blind 3 is closed, the driven sprocket 11 is driven in a counterclockwise direction in FIG. 1, and the chain 15 meshing with the sprocket 11
Is driven in a direction to move the. During the closing operation, when the lowermost slat 5 collides with an obstacle and is prevented from moving in the closing direction, the moving body 17 supporting the lowermost slat 5 is also prevented from moving. You. However, the driving sprocket 7 connected to the main shaft 9
Further pulls the chain 15 to further drive the moving body 17 in the closing direction irrespective of the collision of the slat 5 with the obstacle. The chain 15 causes the chain member 15 to
Move further by stretching. With respect to the pulling of the chain 15 by the driving sprocket 7, the moving body 17
Since the one end of the chain 15 attached to the shaft 15 is prevented from moving by the moving body 17, the chain 15 that has passed the drive sprocket 7 bends as shown in FIG. The limit switch 23 is pressed by swinging by the spring force of a spring member 29 connected to the operating member 25. When the limit switch 23 is pressed, the limit switch 23 is operated, and a stop signal is transmitted to the control circuit to stop the motor. Thereby, the movement of the moving body 17 is stopped without exerting an excessive force on the slat 5 at the lowermost end, and there is a possibility that the mounting portion between the slat 5 and the slat 5 and the slat 5 at the lowermost end or an obstacle may be damaged. Absent.

In order to release the operation of the limit switch 23, the drive sprocket 7 is driven to rotate in the opposite direction (the direction in which the blind 3 is opened). The rotation of the driving sprocket 7 in the opposite direction to that described above
The operating member 25 swings in a direction away from the limit switch 23 while extending the spring member 29 by the tension of the chain 15. The swing of the operating member 25 releases the operation of the limit switch 23, and the blind 3 is opened and closed.

The present invention is not limited to the above configuration, and various configurations can be adopted without departing from the technical scope of the present invention. For example, in the present embodiment, the operation of the limit switch is performed by the swinging motion of the operating member, but the limit switch may be operated by the reciprocating motion of the operating member. In this embodiment, the spring member connected to the flexible transmission member has one end connected to the movable body and the other end connected to the flexible transmission member. In this case, the connection position of the spring member to the flexible transmission member is set at a point symmetrical position with respect to the moving body with respect to an intermediate point of a line connecting the center points of both sprockets. Is preferred.

[0012]

[Effects of the Invention] Since the present invention is provided with the safety stop device having the above-described configuration, even if an obstacle or the like collides with the slat at the lowermost portion, the slat or the like is not damaged, and the slat is not damaged. Driving can be safely stopped.

[Brief description of the drawings]

FIG. 1 is a side view showing a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing a preferred embodiment of the present invention.

FIG. 3 is an explanatory view showing the operation of the safety stop device of the present invention.

[Explanation of symbols]

 Reference Signs List 7 driving sprocket 11 driven sprocket 15 flexible transmission member 17 moving body 18 spring member 23 limit switch 25 operating member

Claims (1)

(57) [Scope of request for utility model registration] 1. A frame, a main shaft laterally provided in an upper horizontal frame of the frame and connected to a motor, a drive sprocket mounted on the main shaft, and a lower portion of the frame. Driven sprocket, a flexible transmission member mounted between the two sprockets, and a vertically movable frame disposed between the left and right vertical frames of the frame to cover an opening formed by the frame. A number of slats, a link mechanism that continuously supports the number of slats and allows the slats to tilt, and is attached to the flexible transmission member and connected to one end of the link mechanism; A moving body that raises and lowers a number of slats by rotating the main shaft, and a slat tilting mechanism that is provided coaxially with the main shaft, is connected to the link mechanism, and tilts each slat by rotating the main shaft. Naruto Shutter Bly A safety switch, wherein the safety stop includes a limit switch for stopping driving of the slat, a spring member connected to the flexible transmission member,
An actuating member that abuts on the flexible transmission member and moves by bending of the flexible transmission member to operate the limit switch.