JPH01230945A - Shutter opening and closing device for ventilation fan - Google Patents

Abstract

PURPOSE:To facilitate opening operation of a shutter and hence prevent the generation of flapping during shutter closing, by installing a cam which is supported by a connection plate, rotating in sliding contact with a stiffening plate, and a stopper which inhibits said connection plate from moving in a vertically downward direction. CONSTITUTION:When a string attached ot an interlocking switch 8 is pulled down, force is transmitted to a connection wire 7, which allows a cam 6 to rotate its circular part 6a in sliding contact with a stiffening plate 13 against the tensile force of an auxiliary spring 9. As a result, a cam support pin 10 and a connection plate 5 move horizontally. This motion eliminates the contact between the connection plate 5 and a stopper 12. When the tensile force of the spring 9 is balanced with the action force of the wire 7, the rotation of the cam 6 comes to a halt and the connection plate 5 moves downward. When the cam 6 is pulled down to a specified position, separated from the stiffening plate 13, a shutter 2 is brought into open state. On the other hand, when the shutter 2 during closed state is subjected to external force or outside wind which opens the shutter, the connection plate 5, which is pulled to the side of a frame member 1 by the action of a spring 11, moves vertically downward as it is, as a result, a rising part 5a is placed into contact with the stopper 12 and moves no further. It is, therefore, possible to prevent any possible flapping in the shutter 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a shutter opening/closing device that turns on and off the motor of a ventilation fan attached to the wall of a house and opens and closes the shutter by operating a pull string connected to a switch. It is related to.

2. Description of the Related Art Conventionally, a shutter opening/closing device for a ventilation fan of this type has a structure as shown in FIGS. 4 and 5.

That is, the frame 10 of the mK fan, a part of which is shown in the figure.
A plurality of shutters 102 are attached to the outdoor side opening of the shutter 1 in a manner that they can be opened and closed, and a connecting plate 10 is movably connected to the shutters 102 and is displaced in conjunction with the opening and closing of the shutters 102.
5, and pull down this connecting plate 106 to close the shutter 1.
A connecting wire 107 has one end hooked to a hole provided in a part of the connecting plate 105 and the other end hooked to a pull string interlocking switch 108 in order to open the connecting wire 107 , and a cut-and-raised part provided at the frame body 101 at one end. The spring 11 is hooked on the connecting plate 105 and the other end is hooked on the connecting plate 105 to bias the shutter 102 in the closing direction.
1, and when the connecting plate 105 tries to move vertically downward,
A stopper 112 is provided so that a portion of the connecting plate 105 comes into contact with the stopper 112. In such a configuration,
By pulling the switch 108, the connecting wire 10
7 is pulled down, and at the same time, the connecting plate 106 is also pulled down, and the shutter 102 is opened. At this time, the hook of the connecting wire 107 of the switch 10B is located inside the frame body than the hook of the connecting wire 107 of the connecting plate 105, so when the pull string of the switch 108 is operated, After moving down (arrow 1 in Figure 5)
, moves downward (arrow 2 in Figure 5). On the other hand, shutter 10
When the shutter 2 is closed, when a force in the direction of opening is applied by the outside wind, the connecting plate 105 falls vertically downward, so that it comes into contact with the stopper 112 and the shutter 102 does not open.

That is, when the shutter is closed, the shutter is prevented from fluctuating due to the outside wind, and when the shutter is opened or the blind pull string switch 108 is operated, the connecting plate 105 moves to avoid the stopper 112.

Problems to be Solved by the Invention In such a conventional configuration, the connecting plate 105 must not touch the locking plate 112 when initially moving diagonally downward to the left. If the distance between the connecting plate 105 and the locking plate 112 becomes too small (usually 2.5H or less), the connecting plate 105 will hit the locking plate 112 when the pull cord switch 108 is operated, and the shutter 102 will not open, or the distance may become too small. If it's too big (usually 5 or more), the shutter will be 10.
2, when the door is closed, it opens slightly in response to the outside wind, causing a fluttering phenomenon.

Furthermore, if the ear portion formed by bending the end of the shutter 102 falls inward, the connecting plate 105 will also fall inward, and even if the connecting plate 105 moves vertically downward, the stone /<-11zK
M et al. The tumble prevention function disappears. On the other hand, if the ears of the shutter 102 are tilted outward, the connecting plate 106 comes into contact with the stopper 112 even during normal operation of the pull string, and the shutter 102 may not open.

The present invention is intended to solve these problems, and the problem is that the shutter varies due to variations in the distance between the connecting plate and the stopper, and inclination of the shutter ears.

It is an object of the present invention to provide a shutter opening/closing device for a ventilation fan that prevents the shutter from getting caught when opening.

Means for Solving the Problem In order to solve this problem, the present invention provides a plurality of shutters that are supported to be openable and closable at the outdoor side opening of a frame body having an indoor side and an outdoor side opening, and a shutter that is movable to the shutter. A fulcrum shaft is attached to a mounting surface that extends outward via a connecting plate that is connected to the connecting plate and is displaced in conjunction with the opening and closing movement of the connecting plate, and an upright part that extends forward above the connecting plate. A cam having an arcuate portion and rotatably supported by a cam, an upper end of which is connected to a position above and outward from the fulcrum shaft, and a lower end of which is connected to a pull-string-operated interlocking switch fixed below the frame. a connecting wire, an auxiliary spring biasing the cam in a direction opposite to the force exerted by the connecting wire, a stopper protruding from the frame and located near the lower end of the rising edge of the connecting plate, and the shutter. a contact plate provided upright on the frame that abuts the arcuate portion of the cam when closed; and a shutter spring that biases the connecting plate in a direction that constantly pulls the connecting plate upward and toward a side surface of the frame. This constitutes a shutter opening/closing device for a ventilation fan.

Operation With this configuration, when the pull string of the interlocking switch is pulled down, the cam first rotates with its arcuate portion slidingly abutting against the abutting plate, moving the connecting plate in the horizontal direction, and connecting the connecting plate and the stopper. After that, the connecting rod moves downward and the shutter is opened. On the other hand, when the shirt is being put on and closed, if the shutter receives a force in the direction of opening (due to the outside wind), the connecting plate will move vertically downward, and its upright part will come into contact with the stopper, causing the shutter to no longer move. , since the shutter does not open, the shutter does not flap.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3. A plurality of shutters 2 are rotatably supported at the outdoor opening of the frame 1 of the ventilation fan by support pins 4 fixed to the frame 1, and ears are bent at the ends of the shutters 2. movably connected by plastic rivets 3 to
A connecting plate 5 is provided which is displaced in conjunction with the opening/closing movement of the shutter 2. A mounting surface 5b is provided above the connecting plate 5 and extends outward via a rising portion 5a extending forward.
A cam 6 having an arcuate portion 6a at its upper end is rotatably supported on this mounting surface 6b by a cam support pin 1o, and is positioned below the frame 1 at an upper and outer position with respect to the cam support pin 10 of the cam 〇. The upper end of a connecting wire 7, the lower end of which is connected to an interlocking switch 8, which is identified and operated by a pull cord (not shown), is connected. Further, an auxiliary spring 9 is connected above the cam 6 to bias the cam 6 in the opposite direction to the direction in which the cam 6 is rotated by the connecting wire 7. A stopper 12 protruding from the frame 1 is provided near the lower end of the mounting surface 5a of the connecting plate 5. Further, a contact plate 13 is provided upright on the frame 1 at a position where the arcuate portion 6a of the cam 6 contacts when the shutter 2 is closed. The contact surface of the contact plate 13 with the cam 6 is formed in the direction in which the arc portion 6a slides when the cam 6 rotates. Furthermore, a shutter spring 11 is attached above the connecting plate 5 to urge the connecting plate 5 to constantly pull it upward and toward the side surface of the frame 1.

In the above configuration, when the pull string of the interlocking switch 8 is pulled down to open the shutter 2, force is transmitted to the connecting wire 7 and the cam 6 slides its arcuate portion 6a against the contact plate 13 against the tension of the auxiliary spring 9. The cam support pins 10 move inwardly and horizontally, and the connecting plate 5 also moves inwardly and horizontally. This operation eliminates the contact between the connecting plate 5 and the stopper 12 (FIG. 3A). When the tension of the auxiliary spring 9 and the force acting on the connecting wire 7 match, the rotation of the cam 6 stops and the connecting plate 6 moves downward. (
(FIG. 3B) Then, when the cam 6 is separated from the abutment plate 13 and pulled down to a predetermined position, the shutter 2 becomes open. (Fig. 3C) In this way, by dividing the force detection direction of the connecting plate 6 into two, horizontal and downward, the stopper 1
2 and the connecting plate 5 do not come into contact with each other during a normal shutter 2 opening operation. On the other hand, when the shutter 2 is closed, if it receives an external force in the direction of opening due to outside wind, the shutter spring 1
1, the connecting plate 5 is pulled toward the side surface of the frame 1, so it moves vertically downward, and its rising portion 6
Since the shutter a contacts the stopper 12 and is no longer effective, the shutter 2 does not fluctuate.

In addition, since the stopper 12 is provided near the lower end of the rising portion 6a of the connecting plate 6, even if there is some dimensional variation in the assembly variation 9 of the parts, the distance fiL between the two will not become so large, and the flapping will not occur when the shutter 2 is closed. does not occur.

Further, even if the ear at the end of the shutter 2 falls outward or inward, the movement direction of the connecting plate 6 can be divided into two, horizontal and downward, as described above, and the stopper 12
Since the position is near the lower end of the rising portion 5a of the connecting plate 5, the opening operation of the shutter 2 is performed smoothly, and no flapping occurs when the shutter 2 is closed.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, there is provided a cam that is supported by a connecting plate and rotates while its arcuate portion is in sliding contact with the abutting plate, and a cam that rotates vertically below the connecting plate. Since the shutter is equipped with a stopper that prevents movement of the shutter, even if there are assembly variations of parts, dimensional variations, or slight distortion of the shutter shape, the shutter opening operation will be performed smoothly without getting stuck. This has the effect that the shutter does not fluctuate for a while when it is closed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a ventilation fan shutter opening/closing device according to an embodiment of the present invention, Fig. 2 is a front view of the same, Fig. 3 is an explanatory diagram of the main parts of the same, and Fig. 4 is a conventional ventilation fan shutter opening/closing device. FIG. 5 is a perspective view of the same operation. 2...Shutter, 6...Connection plate, 6.
...Cam, 6a... Arc part, end...
...Connection wire, 8...Interlocking switch, 1o.
...Cam support pin, 12...Stopper,
13... Collapse plate. Name of agent: Patent attorney Satoshi Nakao, male and 1 other person Kadokarimoto 2~ Shutter 5 - Umiomomi 7 - Iichi Ryoto Kayawai Y - δ-taps 4/su Figure 2 Figure 3 Figure 3 (G) Figure 4

Claims (1)

[Claims] a plurality of shutters supported to be openable and closable at the outdoor side opening of a frame body having an indoor side and an outdoor side opening; a connecting plate movably connected to the shutter and displaced in conjunction with the opening/closing movement of the shutter; a cam having an arcuate portion rotatably supported by a fulcrum shaft on a mounting surface extending outwardly via a rising portion extending forward above the connecting plate; and the fulcrum shaft of the cam. a connecting wire having an upper end connected to a pull-string-operated interlocking switch fixed to a lower part of the frame body and a connecting wire connected at an upper end to a position above and outwardly from the frame, and in a direction opposite to the force exerted by the connecting wire on the cam; an auxiliary spring that biases; a stopper that protrudes from the frame and is located near the lower end of the rising edge of the connecting plate; and an abutment provided upright on the frame that abuts the arcuate portion of the cam when the shutter is closed. A shutter opening/closing device for a ventilation fan comprising a contact plate and a shutter spring that always pulls up the connection plate upward and urges it toward the side surface of the frame.