JP2502655B2 - Ventilation fan shutter opening and closing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter opening / closing device for a ventilation fan, which is mainly attached to a wall.

2. Description of the Related Art A conventional shutter opening / closing device for a ventilation fan of this type has a structure as shown in FIGS. 3 and 4. That is, the shutter 23 is pivotally attached to the rear opening 21 of the frame body 20 by the fulcrum shaft 22. The ends of the plurality of shutters 23 are connected to the connecting rod 25 by the shaft 24, and the connecting rod 25 is connected to the connecting rod 26 of the interlocking switch 29. Further, a lock claw 27 is provided in a part of the frame body 20, and a spring 28 for urging the shutter 23 in the closing direction is further attached to the connecting rod 25.
It was connected with.

In the above configuration, when the ventilation fan is operated, the power is turned on by pulling the cord (not shown) of the interlocking switch 29 downward to supply the power to the motor (not shown) to rotate the blades. At this time, the connecting rod 26 included in the interlocking switch 29 is also pulled downward at the same time. On the other hand, the connecting rod 25 is biased upward by the spring 28 between the connecting rod 25 and the frame body 20, but at the same time, the front end portion 30 of the connecting rod 25 is also biased toward the side surface side of the frame body 20 by the weak force of the spring 28. Are in contact with each other.
As a result, the downward movement of the connecting rod 26 causes the connecting rod 25 to move.
As shown in FIG. 4, the front end portion 30 of the No. 1 starts to move obliquely downward (arrow in FIG. 4). Therefore, the front end portion 3 of the connecting rod 25 moves so as to avoid the lock claw 27 and opens the shutter 23 connected to the connecting rod 25. Further, closing the shutter is the reverse operation. The action of the lock claw 27 is for the purpose of preventing the flap 23 from fluttering caused by the outside wind or the pressure difference between the inside and the outside when the connecting rod 26 does not move downward, that is, when the interlock switch 29 is not operated. When the shutter 23 is opened from the shutter 23 side, the front end portion 30 of the connecting rod 25 is urged by the spring 28, so that the front end portion 30 of the connecting rod 25 contacts the frame body 20 and moves downward. When it moves, it abuts the lock claw 27 and the connecting rod 25 does not move downward anymore. As a result, there is no further opening of the shutter 23, and it is possible to prevent noise due to flapping.

Problems to be Solved by the Invention In such a conventional configuration, it is necessary to provide a certain distance between the lock claw 27 and the front end portion 30 of the connecting rod 25. This is because, when the shutter is opened, the connecting rod front end 30 does not move in the lateral direction but moves obliquely downward, so that the distance L for avoiding the lock claw 27 is required. The function of preventing flapping is not sufficient, and there is a problem in that the generation of noise due to some flapping must be compromised.

The present invention solves such a problem, and an object of the present invention is to reduce the flapping phenomenon of the shutter caused by the outside wind and the pressure difference between the inside and outside of the shutter when the shutter is closed, and to reduce the noise generated thereby. is there.

Means for Solving the Problems In order to solve this problem, the present invention relates to a connecting rod movably connected to a shutter and movably provided in the vertical direction, and one end of which is rotatably connected to the connecting rod. A predetermined distance between two upper and lower claws connected to the upper end of a connecting rod connected to a spring for urging the other end upward and an interlocking switch provided below the frame, and protruding from the connecting rod. The shutter of the ventilation fan having a lock claw that is provided in the frame body and that has a lock claw that is close to the front end of the actuating plate when the actuating plate contacts the upper claw. The switchgear is configured.

Operation With this configuration, when the shutter is opened, when the connecting rod is pulled down by the interlocking switch, the operating plate first moves between the claws of the connecting rod and contacts the lower claw, while the front end of the operating plate is locked by the locking claw. Get away from. Then, the operating plate moves downward together with the connecting plate to open the shutter.

On the other hand, when the shutter tries to open due to an external factor when the shutter is closed, the actuating plate is in a position where it abuts on the upper claw by the spring, so that its front end abuts the lock claw and cannot move any more. The connecting rod is also unable to move downward, which prevents the shutter from flapping.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A plurality of shutters 1 are rotatably provided by support pins 10 at the outdoor opening of the frame 6 of the ventilation fan main body. One end of each shutter 1 is movably connected to a connecting rod 2 so as to open and close in conjunction with each other, and the connecting rod 2 is provided so as to be vertically movable. Further, the connecting rod 2 has claws 12 and 13 cut and raised at two positions above and below the tip of the portion integrally extending forward on the indoor side, and one end of the flat plate-like actuating plate 3 is rotatable by a movable fulcrum. It is provided in. The operating plate 3 has its other end connected to a spring 7 which is fixed to the frame body 6 and urges the frame body 6 upward, and a connecting rod 8 which is connected to an interlocking switch arranged below the frame body 6, and has the above-mentioned claw. It is placed between 12 and 13. The width of the other end of the operating plate 3 is slightly narrower than the interval between the claws 12 and 13, and the claws 12 and 13 have a dimensional relationship in which the claws 12 and 13 can be rotated by the gap (hereinafter referred to as a predetermined rotation range). . And the operating plate 3 is the upper claw
The lock claw 5 is cut and raised at a position very close to the front end of the actuation plate 3 of the frame 6 when the lock claw 5 is in contact with the lock plate 12.

 The operation of the ventilation fan having the above structure will be described below.

When a pulling string (not shown) of the interlocking switch 9 is pulled downward to operate the ventilation fan, the motor is energized and the connecting rod 8 is pulled down. Then, the operating plate 3 is also pulled down, but the operation at this time is divided into the following two. That is, first, as shown in FIG. 2 (A), the other end of the operating plate 3 is rotated within a predetermined rotation range against the tension of the spring 7 with the rotation fulcrum 4 as a fulcrum to contact the lower claw 13. Contact. During this time, the front end portion of the operating plate 3 moves away from the position where the lock claw 5 is adjacent. Next, as shown in FIG. 2 (B), the operating plate 3
Is in contact with the lower claw 13, so that when it is further pulled down by the connecting rod 8, the connecting rod 2 is integrally moved downward. At this time, the front end portion of the operating plate 3 moves as shown in FIG. 2 (A). Therefore, it is not caught on the lock claw. Then, the shutter 1 connected to the connecting rod 2 is opened.

On the other hand, when the shutter 1 tries to open due to external factors such as the outside wind or the pressure difference between the inside and outside of the room, the operating plate 3 is pulled upward by the spring 7 and abuts on the upper claw 12 at this time. In this state, even if the connecting rod 2 connected to the shutter 1 moves downward and the operating plate 3 is moved diagonally downward,
The lock claw 5 prevents the operation plate 3 from moving forward,
Therefore, the movement of the connecting rod 2 is stopped, and the fluttering of the shutter 1 is prevented.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the present invention, the normal shutter opening / closing operation is smoothly performed without being caught by the shutter flap prevention mechanism, while the shutter flap prevention mechanism is used. Since the operating plate and the lock claw can be provided at positions very close to each other, the fluttering phenomenon is almost eliminated, and it is possible to prevent noise from being generated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a shutter opening / closing device of a ventilation fan according to an embodiment of the present invention, FIG. 2 is a side sectional view for explaining the operation of the shutter opening / closing device, and FIG. FIG. 4 is a perspective view of the shutter opening / closing device of the ventilation fan, and FIG. 4 is a front view for explaining the operation of the shutter opening / closing device. 1 ... Shutter, 2 ... Connecting rod, 3 ... Actuating plate, 5 ...
Lock claw, 6 ... Frame, 7 ... Spring, 12,13 ...
nail.

Claims (1)

(57) [Claims] 1. A shutter rotatably provided at an outdoor side opening of a frame of a ventilation fan main body, a connecting rod movably connected to the shutter and vertically movable, and one end of the shutter. It is rotatably connected to a connecting rod and is connected to the upper end of a connecting rod connected to a spring for urging the other end upward and an interlocking switch provided below the frame, and projects from the connecting rod. An operating plate disposed with a predetermined rotation range between the upper and lower claws, and the locking claw that is close to the front end of the operating plate when the operating plate abuts the upper claw. A shutter opening / closing device for a ventilation fan provided on the frame.