JPS6314271Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter device having, in addition to a shutter, a spring that applies a restoring force to a connecting rod connected to the shutter.

Conventionally, in this type of shutter device used for ventilation fans, for example, the shutter is connected to the operating mechanism that controls its opening and closing via a connecting rod, and the shutter, which extends through the connecting rod, resists a spring that applies a restoring force to the shutter. It was designed to be operated in the open position, which required a considerable amount of operating force and had the troublesome drawback.

The present invention has been developed in view of the above-mentioned circumstances, and the object thereof is to provide a shutter device that can be opened easily with little force.

Hereinafter, an embodiment in which the present invention is applied to a shutter device for a ventilation fan will be explained with reference to the drawings. First, in FIG. 4 and the shutter 5, especially the shutter 5.
Regarding this, a total of three pieces, upper, middle, and lower, are arranged in the outdoor opening of the support frame 1, and the intermediate parts near the upper end of each are attached to both left and right sides of the support frame 1 by means of a support shaft 6. It is pivoted to the wall so that it can move up and down. Reference numeral 7 denotes a link connected to each upper end of such a shutter 5 by a rivet 8, and in detail, each shutter 5 is connected to the upper end thereof by a rivet 8.
It forms an L-shape (anti-L-shape) integrally having a vertical part 7a extending from above to below along the vertical part 7a and a horizontal part 7b extending forward from the lower end of this vertical part 7a, A U-shaped notch 9 is formed at the tip of the horizontal portion 7b. Reference numeral 10 denotes an operating mechanism below the notch 9, which also includes a pull plate 11, a switch that controls energization/disconnection of the motor 3 according to the vertical movement of the pull plate 11, and a lowered pull plate 11. The switch box 12 has a built-in locking mechanism (not shown) for holding the switch box 12, and the pull plate 11 has a draw string 13 hanging from the lower end of the switch box 12 projecting downward. A hole 14 is formed in the upwardly projecting upper end of the switch box 12, and the hole 14 and the connecting rod 7, particularly the notch 9, are connected by a ring 15.

Now, in addition to the above, 16, 17, and 18 are holes in the vertical part 7a of the connecting rod 7 that are used for connection with the shutter 5 by the rivet 8, of which the uppermost hole 16 is abbreviated as rivet 8. In addition to forming round holes with the same diameter, the holes 17 at the middle position and the holes 18 at the lowest position are respectively
6 is formed in the shape of a long hole extending along a circular arc locus, so that the continuous rod 7 is connected to the topmost shutter 5 as a whole.
It has a structure that allows it to rotate within a predetermined range back and forth around the connecting part. 19 connects the connecting rod 7 and the support frame 1 in order to give the connecting rod 7 a restoring force which will be described later.
Specifically, it is a spring stretched between the hole 20 formed near the middle of the vertical part 7a of the connecting rod 7 and the protrusion 21 cut and formed on the left side wall of the support frame 1. The projecting piece 21 is always located below the hole 20 even when the connecting rod 7 moves up and down as the shutter 5 is opened and closed, as will be described later. The spring 19 is also stretched so that its support frame side attachment end 19a is always located below the connecting rod side attachment end 19b. In this case, the spring 19 is one that generates a spring force smaller than the closing force due to the shutter 5's own weight from the open state. On the other hand, 22 is the horizontal part 7 of the connecting rod 7.
b A protrusion cut and formed on the lower edge, 23 is the protrusion 22
The support frame 1 has a rearward inclined portion 23a that collides with the support frame 1
This stopper is also cut and raised at the bottom of the left side wall.

Next, to describe the operation, first, before the entire body is operated, the spring 19 pulls the connecting rod 7 forward and downward, as shown in FIG. 1, thereby creating a margin in the front of the holes 17 and 18. On the other hand, the ring 15 is tilted forward and the projecting piece 22 is brought into contact with the stopper 23. Therefore, the connecting rod 7 is not pulled any further, and the shutter 5 is held in the closed state by its own weight, and even if it receives an opening force from the outside such as an outside wind, the connecting rod 7 will not be pulled in this direction, especially the stopper 23. By continuing to be restrained by the inclined portion 23a, it is also restrained and held in the closed state. On the other hand, when the pull string 13 is pulled down, the pull plate 11 is pulled down at the same time, and a switch (not shown) in the switch box 12 is actuated to energize the motor 3 and connect it via the ring 15. Rod 7 also receives the operating force here. Therefore, the connection 7 that received the operating force in this way
At first, it rotates rearward around the connection part with the highest shutter 5, slightly resisting the spring force of the spring 19, and
As a result, the protruding piece 22 is shifted from the stopper 23,
Thereafter, it moves downward while compressing the spring 19, that is, in accordance with the spring force of the spring 19, and pulls down each upper end of the shutter 5 by the rivet 8, and conversely pulls down the portion of the shutter 5 ahead of the support shaft 6. Raise the shutter to the "open" state as shown in Figure 2. Therefore, during this time, all operations except the first are performed according to the spring force of the spring 19, and the shutter 5 can therefore be opened easily with less force than in the past.
It can be very convenient. Incidentally, when the shutter 5 is opened in this way, the blades 2 have started to rotate based on the activation caused by the energization of the motor 2, and therefore, the blades 4, which continue to rotate, are not contaminated indoors. The air is forcibly discharged outdoors through the open part of the shutter 5, that is, the outdoor opening of the support frame 1, and fresh air commensurate with the amount of discharge is naturally drawn in from the outdoors for ventilation. Further, the operating state of the ventilation fan (the open state of the shutter 5) is maintained by the lock mechanism within the switch box 12 continuing to hold the pull plate 11 in the lowered position.

When the pull string 13 is pulled down again from the above-mentioned operating state, the lock mechanism in the switch box 12 causes the pull plate 11 to be pulled down.
is released from holding, but since the connecting rod 7 is pulled down in accordance with the spring force of the spring 19 at this time as well, the operation requires less force. Furthermore, after the holding of the pull plate 11 is released in this way, the shutter 5 returns naturally due to its own weight resisting the spring force of the spring 19, and also to the upper part of the connecting rod 7. The return of the shutter 5 also occurs naturally with the return of the shutter 5, and only the forward return of the link 7 that has returned upward, that is, the return to the position controlled by the stopper 23 as described above, is the only time the link 7 returns. This is done by the spring force of the spring 19, which is expanded as the spring 7 rises.

Although one embodiment of the present invention has been described above, the present invention is not limited thereto, and is particularly suitable for use not only as a ventilation fan having blades and a motor, but also as a shutter device for other equipment or as a stand-alone shutter device. In addition, the number of shutters, the specific shapes and configurations of each part, etc. can be changed as appropriate without departing from the gist of the invention.

As is clear from the above description, the present invention not only has a shutter that is pivoted to be vertically movable on a support frame to open and close, but also has a linking rod that is connected to the shutter and moves up and down, and operates this linking rod. an operating mechanism that opens and closes the shutter; and a return mechanism that is stretched between the support frame and the connecting rod and is brought into contact with a stopper provided on the connecting rod to prevent downward movement of the connecting rod when the shutter is closed. The shutter is equipped with a spring that applies a force, and the spring is set to generate a spring force that is smaller than the closing force due to the shutter's own weight from the open state, so that the mounting end on the support frame side is always mounted on the connecting rod side. It is characterized by being stretched so that it is located below the end, and with this, the shutter can be opened without resisting the spring force, and on the contrary, it can be opened in accordance with the spring force, so it requires less force. It has the valuable practical effect of being able to open easily with a small amount of force, and also being able to be operated in accordance with the spring force when closing, and thus being able to close lightly with a small amount of force. Since the shutter is restrained and held in the closed state by the stopper, it will not open even if it receives an opening force from the outside such as an outside wind, and its so-called flapping can be prevented. This has the added effect of preventing the occurrence of such problems.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view with the shutter closed, and FIG. 2 is a longitudinal side view with the shutter opened. In the figure, 1 is the support frame, 5 is the shutter, 7 is the link,
10 is an operating mechanism, 19 is a spring, 19a is a mounting end on the support frame side, 19b is a mounting end on the connecting rod side, and 23 is a stopper.

Claims (1)

[Scope of utility model registration request] In addition to having a shutter that is pivotally supported to be vertically movable on a support frame to open and close, a connecting rod that is connected to the shutter and moves up and down, an operating mechanism that operates this connecting rod to open and close the shutter, and the support. A spring is provided that is stretched between the frame and the connecting rod and provides a return force to the connecting rod to cause it to collide with a stopper provided to prevent downward movement of the connecting rod when the shutter is closed. , the spring is set to generate a spring force smaller than the closing force due to the shutter's own weight from the open state, and the spring is stretched so that its mounting end on the supporting frame side is always located below the mounting end on the connecting rod side. A shutter device characterized by comprising: