JPH0512595U - Safety device for shutter - Google Patents

Abstract

(57) [Abstract] [Purpose] A safety device that allows the limit switch 28 to detect an obstacle hitting either of the widthwise ends of the movable member 22. [Arrangement] When an obstacle hits the end of the movable member 22 near the arm 26, the movable member 22 is pushed up in the direction of arrow C and swivels around the tip of the arm 24.
6 rotates the rotary cylinder 32 via the arm 36, and the plunger 28A is pushed into the limit switch 28 so that the limit switch 28 stops the drive motor of the shutter body. When an obstacle hits the other end of the movable member 22, the arm 24 is prevented from turning around the arm 26 by the guide surface 18C.
The tip end of 26 is raised while maintaining the horizontal state while being guided by the inclined guide surfaces 18C and 18D, and the arm 26 operates the limit switch 28 via the arm 36.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for a shutter, which is provided at a lower end portion of the shutter body and stops the operation of the shutter body by interfering with an obstacle.

[0002]

[Prior Art]

 The shutter that opens and closes the building entrance has a movable member at the lower end of the shutter body that is moved up and down.When this movable member hits an obstacle, the switch is activated and the vertical movement of the shutter body stops. ing.

However, when the movable member that hits the obstacle hits the obstacle over the entire width direction, or when the obstacle hits one end in the width direction, the switch is surely operated, but the other end in the width direction. When an obstacle hits, only the hit part is raised, and the part corresponding to the switch does not rise, so the switch may not operate reliably.

[0004]

[Problems to be solved by the device]

 In consideration of the above facts, the present invention aims to obtain a safety device for a shutter that can reliably detect any obstacle in the width direction of a movable member that hits the obstacle.

[0005]

[Means for Solving the Problems]

 A safety device for a shutter according to the present invention is a safety device for a shutter, wherein a movable member provided at a lower end portion of a shutter body hits an obstacle to operate a switch, and slides both ends in a width direction of the movable member. A pair of opposing guide surfaces that guide each other at a distance substantially equal to the width dimension of the movable member and that are inclined and parallel to each other, and the upper side of the pair of opposing guide surfaces separates from the other. And a detection unit that detects an end rise of the movable member guided by the guide surface inclined to the side.

[0006]

[Action]

 If an obstacle hits the entire widthwise direction of the movable member while the shutter body is moving, the entire movable member is raised and the detector detects this, so that the movement of the shutter body is stopped. If an obstacle hits the end of the movable member that is guided by the guide surface that is inclined at the one end in the width direction of the movable member and the upper side of the pair of opposed guide surfaces is away from the other guide surface, Since the end of the movable member is pushed up, the detection unit corresponding to this end can detect the rise of the movable member. On the other hand, if an obstacle hits the end of the movable member, which is the end of the movable member and is inclined toward the other guide surface, the end of this movable member Since the other end is guided by the inclined guide surface and rises while maintaining a substantially horizontal state, the detector can detect the rise of the movable member and stop the movement of the shutter body.

[0007]

【Example】

 FIG. 2 shows a shutter to which the present invention is applied. The plurality of shutter slats 12, which are the main bodies of the shutter, have their upper and lower ends connected to each other, and their lateral ends can be vertically moved by being guided by guide rails 14 and 15. The upper end of the shutter slat 12 is wound around the winding shaft in the winding device 16 by the motor driving force.

As shown in FIG. 1, a U-shaped block 18 having an open lower end is fixed to the lower end of the shutter slat 12. The width direction of the block 18, that is, the outer and inner ends of the building are projecting pieces 18A and 18B that are bent toward each other, and L-shaped arms 24 and 26 fixed to the upper end of the movable member 22. Have been stopped for each. This allows the movable member 22 to project below the block 18 and rise into the block 18.

Opposing surfaces that are continuous with the protruding pieces 18A and 18B are guide surfaces 18C and 18D, which are arranged parallel to each other and are inclined. This inclination direction is such that the upper end of the guide surface 18C approaches the guide surface 18D, and conversely the upper end of the guide surface 18D is inclined away from the guide surface 18C. In this case, the distance between the guide surface 18C and the guide surface 18D is approximately equal to the distance between the tip portions of the arms 24 and 26, and in the state of FIG. 1, the tip portion of the arm 24 is centered around the tip portion of the arm 26. It is preferable that the guide surface 18C impedes this rotation when it tries to rotate in the clockwise direction, and the tip end of the proximity switch 26 is raised along the guide surface 18D. That is, when an upward force is applied to the movable member 22 near the arm 24 from an obstacle in the direction of arrow A, the guide surfaces 18C and 18D move the movable member 22 in the direction of arrow B along the inclination direction of the guide surface. As shown in FIG. 3B, the movable member 22 is raised while maintaining the horizontal state. Further, when a rising force is applied to the movable member 22 near the arm 26 in the direction of the arrow C from the obstacle, the arm 26 is turned around the arm 24 as shown in FIG. 3 (A). ing.

A rotary cylinder 32 is arranged to transmit the rise of the arm 26 to the plunger 28A of the limit switch 28 mounted on the ceiling surface in the block 18. The rotary cylinder 32 is accommodated in a substantially C-shaped guide cylinder 34 provided in the block 18, and an arm 36 protruding in the radial direction is interposed between the arm 26 and the plunger 28A. Therefore, when the arm 26 is raised, the rotary cylinder 32 is rotated so that the arm 36 is raised together with the arm 26, and the arm 36 presses the plunger 28A as shown in FIG.

Although the cross-sectional structure of FIG. 1 is uniform in the longitudinal direction of the block 18 (left-right direction in FIG. 2), only the limit switch 28 (including the plunger 28A) is only part of the longitudinal direction of the block 18, that is, Only one is provided. However, since the rotary cylinder 32 is rotated around the axis even when a part of the arm 26 is lifted, the limit switch 28 is reliably operated. When the limit switches 28 are provided at a plurality of positions in the longitudinal direction of the block 18, the arm 26 may be brought into direct contact with the plunger 28A.

Next, the operation of this embodiment will be described. The motor in the winding device 16 operates to move the shutter slat 12 up and down. If an obstacle hits the movable member 22 during the operation of the shutter slat 12, the movable member 22 is raised and the limit switch 28 detects this, and this detection signal is sent to a control device (not shown) wirelessly or by wire. Then, the motor in the winding device 16 is stopped. The movement of the shutter slats 12 is stopped. In this case, as shown in FIG. 3 (A), when a rising force acts from an obstacle near the arm 26, which is one end in the width direction of the movable member 22, the guide surface 18D causes the arm 26 to rotate about the arm 24. Since there is no obstruction, the arm 26 rotates the rotary cylinder 32 via the arm 36, the plunger 28A is pressed, and the rise of the movable member 22 is detected.

Further, as shown in FIG. 3B, when an obstacle exerts a rising force on the other end of the movable member 22 in the width direction, the tip end of the arm 24 moves the tip end of the arm 26 by the guide surface 18C. Since the turning around the center is blocked, the movable member 22 ascends in the direction of arrow B along the guide surfaces 18C and 18D while maintaining a substantially horizontal state. Therefore, the arm 26 rotates the rotary cylinder 32 via the arm 36, and the plunger 28A is pushed into the limit switch 28, which also stops the motor in the winding device 16.

As described above, the limit switch 28 can be operated regardless of which of the widthwise ends of the movable member 22 is in contact with the obstacle.

In the above embodiment, the tip ends of the arms 24 and 26 are in contact with the guide surfaces 18C and 18D in a substantially point contact state, but the tip portions of the arms 24 and 26 are parallel to the guide surfaces 18C and 18D. It may be provided.

[0016]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to reliably detect even if an obstacle hits one end of the movable member in the width direction.

[Brief description of drawings]

1 is a cross-sectional view taken along the line I-I of FIG.

FIG. 2 is a front view showing a shutter to which the present invention is applied.

3A is an operation diagram showing a state in which an obstacle hits one side of the movable member in FIG. 1 and the movable member is inclined. FIG.
(B) is an operation diagram showing a state where the movable member is lifted while maintaining a horizontal state due to an obstacle hitting another side of the movable member.

[Explanation of symbols]

 12 Shutter Slat 18 Block 22 Movable Member 24 Arm 26 Arm 28 Limit Switch

Claims (1)

[Scope of utility model registration request] 1. A safety device for a shutter, wherein a movable member provided at a lower end portion of a shutter main body hits an obstacle to operate a switch, and guides both ends of the movable member in a width direction in a slidable manner. A pair of opposing guide surfaces facing each other at an interval substantially equal to the width dimension of the movable member and inclined to be parallel to each other, and a guide whose upper portion of the pair of opposing guide surfaces is inclined toward the side away from the other. A detection unit for detecting an end rise of the movable member guided by the surface,
A safety device for a shutter, characterized by having: