JPH042344Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a ventilation fan, particularly a ventilation fan that can stop the fan by opening only the shutter.

"Prior art" By operating the operating member, (1) the shutter closes and the fan stops (2) the shutter opens and the fan rotates to force exhaust air or supply air (3) the shutter opens,
A conventional example of a ventilation fan that can perform three operations including natural ventilation by stopping the fan is the ventilation fan shown in Japanese Utility Model Application Publication No. 167031/1983. As shown in FIG. 7, the ventilation fan is equipped with a seesaw lever 104, and by pulling one of the seesaw levers 104, the power switch 105 of the ventilation fan is turned on and off, and by pulling the other seesaw lever 104, the ventilation fan is turned on and off. Shutter 1 installed on the front of the ventilation fan
This controls the opening and closing of 02.

However, in the above conventional example, the seesaw lever 104
Since both sides of the ventilation fan are pulled, the operation is selective in which one to pull, and it is necessary to determine which one to pull, but it is troublesome to select the operating member for operating the ventilation fan.
Also, like a normal ventilation fan, it is complicated to pull the seesaw lever twice to open the shutter and rotate the fan. Further, if the seesaw lever 104 is provided as shown in FIG. 7, there is a problem that the dimensions of the ventilation fan in the inside and outside directions inevitably become large.

``Problems to be solved by invention'' The invention disclosed in Japanese Patent Publication No. 55-36893 solves these problems, but it has many components, is difficult to manufacture, and has poor durability. Because of this, the operating noise is also loud. Therefore,
It is difficult to ensure long-term operation. Also, it cannot be manufactured cheaply.

This invention solves the above problems, is easy to operate, and does not require increasing the internal and external dimensions of the ventilation fan.
(1) Shutter closing fan stops (2) Shutter opening fan rotation
(3) The purpose of the present invention is to provide a ventilation fan that is simple in construction, reliable in operation, durable, low in operation noise, and equipped with an inexpensive switch in a ventilation fan that can be set to the shutter open/fan stop position. .

[Structure of the idea]

"Means for Solving the Problem" This invention uses a spring that biases the shutter in the closing direction in a ventilation fan that can rotate the fan when the shutter is open, stop the fan when the shutter is open, and stop the fan when the shutter is closed. The contact lever has one end pivoted on a switch slide mechanically connected to the shutter, and is biased by a spring in a direction away from the contact that energizes the fan motor. A contact proximity guide is provided with a cam follower and guides the cam follower to a position where the shutter is opened by the forward movement of the switch slide from the original position where the shutter is closed and the contact is open, and the contact is closed by a contact lever. and a first locking groove that stops the cam follower with a slight displacement in the backward movement direction of the switch slide while keeping the shutter open and the contact closed, and a first locking groove that stops the cam follower by slight movement of the switch slide while keeping the shutter open and the shutter open. A second locking groove guides the cam follower to the position where the contact lever opens the contact, and a second locking groove guides the cam follower to the original position so that the shutter is closed by the return movement of the switch slide and the contact remains open. This is a ventilation fan characterized by a fixed cam with a return guide groove that guides the fan to its original position.

"Example" Hereinafter, an example of this invention will be described with reference to the drawings. FIG. 1 is a side view showing the whole. The frame 1 of the ventilation fan is open at the front and back (the left side is the outside side and the front part, and the right side is the indoor side and the rear part). A shutter 2 is provided in the front opening of the frame 1. The shutter 2 is fixed to the frame 1 of the ventilation fan so that it can be opened and closed outwardly around the shaft 3. The arms 4 provided near the opening fixed to the shaft 3 are parallel to each other, and are rotatably connected to the connecting rod 5 by pins 4a so that the shutters 2 are interlocked. The upper pin 5a of the connecting rod 5 is fitted into an elongated hole 6a of the switch shutter interlocking rod 6 in the internal and external directions. The interlocking rod 6 is slidably fitted to the vertical guide 6b of the frame 1, one end is locked to the upper end, and the other end is locked to the upper end of the frame 1.
It is pulled up by a tension coil spring 7 that is locked to the. Further, a switch slide 9 is connected to the lower end of the switch shutter interlocking lever 6. The switch slide 9 is a switch 11 fixed to the frame 1.
It is attached so that it can move up and down, and a string 12 for operation is connected to the lower end.

FIG. 2 is a side view showing details of the switch 11 of FIG. 1. The switch slide 9 is slidably engaged with vertical guides 13a provided above and below the switch body 13, and is only allowed to move up and down by covering the switch body 13 with a cover (not shown). A contact lever 15 is pivotally attached to one end of the switch slide 9 by a pin 14. pin 1
The contact lever 15 is connected to the pin 1 by a torsion coil spring 16 which is inserted into the pin 1 and has one end locked to the switch slide 9 and the other end locked to the contact lever 15.
4 in the counterclockwise direction, and is also urged by the same spring 16 in the axial direction of the pin 14 toward the opposite side in the figure. The contact lever 15 is provided with, for example, a dog 18 so as to be able to hold down a normally open contact 17 fixed in the middle, and a cam follower 19 is provided at the tip end thereof to protrude in a direction perpendicular to the plane of the paper. The cam 21 is provided so that the cam follower 19 can close and open the contact 17 by a combination of the rotational position of the contact lever 15 about the pin 14 and the vertical position of the switch slide 9. .

The shape of the cam 21 is a vertical portion 21 that does not displace the cam follower 19 parallel to the switch slide 9 to the left or right.
g, a contact proximity guide part 21a that rotates the contact lever 15 clockwise around the pin 14 as the cam follower 19 descends from top to bottom, and a contact proximity guide part 21a that rotates around the lower end of the contact proximity guide part 21a to rotate the cam follower 1
1st locking groove 21b that is locked when 9 moves to the right
and a second locking groove 21 adjacent to the first locking groove 21b.
c, and a return guide groove 21d for returning the cam follower 19 to its original position as the contact lever 15 rises is provided on the rear side of the second locking groove 21c. The bottom of the return guide groove 21d is oblique with respect to the plane of the drawing so that the lower end is deep and the upper end is shallow.
Triggers 13b and 13c are provided on the switch body 13 opposite to the first and second locking grooves 21b and 21c so that the cam follower 19 cannot move unless it passes through each of these grooves. A power supply 22 is connected to a fan motor 23 via a contact 17. A fan 24 attached to a fan motor 23 is placed overlapping the shutter 2 with a gap therebetween.

In the state shown in FIG. 2, the switch slide 9 is energized by the tension coil spring 7, the switch slide 9 is at the upper limit position, the switch shutter interlocking rod 6 is at the upper limit position, and the link rod 5 rises to move the arm 4 counterclockwise around the shaft 3. The shutter 2 is closed at the rotation limit position. Dotsugu 18
is located above, the contact 17 is open, and the cam follower 19 is in contact with the vertical portion 21g slightly above the top 21e of the cam 21.

In FIG. 2, when the string 12 is pulled downward, the switch slide 9 goes down, and the contact lever 15 also goes down, so the cam follower 19 goes down and when it slides on the contact proximity guide part 21a, the contact lever 15 goes down. and a torsion coil spring 16 centered around the pin 14.
The dog 18 presses the contact 17 as shown in FIG. 3, so that the fan motor 23 is energized and the fan 2
4 rotates. On the other hand, as the switch slide 9 descends, the switch shutter interlocking rod 6 descends against the tension coil spring 7, pulling down the connecting rod 5 via the pin 5a, so that the arm 4 rotates clockwise around the shaft 3 and the shutter 2 open. This forces ventilation. When the cam follower 19 passes the lower end of the contact proximity guide portion 21a, the contact lever 15 rotates clockwise due to the spring force of the torsion coil spring 16, and the cam follower 19 moves to the right to engage the trigger 13b. stopped due to interference.

When the string 12 is loosened, the switch slide 9, the contact lever 15, and the cam follower 19 are slightly raised by the tension coil spring 7 as shown in FIG. , enters the first locking groove 21b and moves to the right, and is held by being pressed against the groove bottom along the right wall of the first locking groove 21b. This slight rise of the switch slide 9 causes the contacts to close and the shutter to remain open.

When the string 12 is pulled in the state shown in FIG. 4, the switch slide 9, the contact lever 15, and the cam follower 1
9 descends, and when the cam follower 19 crosses the protrusion 21f that separates the first and second locking grooves 21b and 21c, the contact lever 15 moves counterclockwise around the pin 14 due to the spring force of the torsion coil spring 16. As the dog 18 rotates in the right direction, the contact 17 is opened, the fan motor 23 is cut off, and the fan 24 is stopped. Since the cam follower 19 moves to the right, when the string 12 is loosened, the cam follower 19 is blocked by the trigger 13c and rises by the spring force of the tension coil spring 7 to enter the second locking groove 21c. , is pressed against the groove bottom along the right wall of the second locking groove 21c, as shown in FIG. As a result, the shutter 2 remains open and natural ventilation takes place. By inching the string 12 in this manner, the open state of the shutter 2 hardly changes.

In FIG. 5, when the string 12 is pulled, the switch slide 9, the contact lever 15, and the cam follower 19 all descend, and the cam follower 19 moves into the second locking groove 21c.
When it comes off, the contact lever 15 further rotates counterclockwise around the pin 14 due to the spring force of the torsion coil spring 16, and comes into contact with an extension 21d' of one side wall of the return guide groove 21d. When the string 12 is loosened, the switch slide 9 and the contact lever 15 rise due to the spring force of the tension coil spring 7, and the cam follower 19 enters the return guide groove 21d and rises. Push the contact lever 15 against pin 1.
4, the cam follower 19 slides on the bottom of the return guide groove 21d, twists the contact lever 15 on the pin 14, and releases the coil spring 16.
The pin is moved axially against the axial spring force of the pin in a direction away from the view perpendicular to the plane of the paper of FIG. Then, when the cam follower 19 comes out of the upper end of the return guide groove 21d, the contact lever 15 slides on the pin 14 in the axial direction due to the spring force in the axial direction of the pin 14 of the torsion coil spring 16, and the cam follower 19 moves to a position deeper than the bottom of the return guide groove 21d and contacts the vertical portion 21g of the cam 21. On the other hand, as the switch shutter interlocking lever 6 rises by pulling up the switch slide 9, the pin 5a is pulled up and the linking lever 5 rises, so that the arm 4 rotates counterclockwise around the shaft 3 to close the shutter 2.

[Effect of idea]

This invention is capable of changing from the state where the shutter is closed and the fan is stopped to the state where the shutter is open, the fan rotates, the shutter opens, the fan stops, the shutter closes, and the fan stops by simply pulling and loosening the string 12 of the operating member. In this ventilation fan, which is easy to operate and understand, the above operation is made to revolve around a cam 21 on which a cam follower 19 provided at the end of a contact lever 15 pivotally connected to a switch slide 9 is fixed. It has few components, is inexpensive, operates reliably, is durable, and operates quietly.

[Brief explanation of the drawing]

Figure 1 is a side view of an embodiment of this invention, Figure 2 is a side view looking inside the switch in Figure 1, Figures 3 to 6 are side views showing the operation of Figure 2, and Figure 7. is a side view of a conventional example. 1... Frame, 2... Shutter, 3... Axis, 4...
Arm, 4a... pin, 5... connecting rod, 5a... pin, 6... switch shutter interlocking rod, 6a... long hole, 6b... guide, 7... tension coil spring, 9
...Switch slide, 11...Switch, 12
... String, 13 ... Switch body, 13a ... Guide, 13b, 13c ... Trigger, 14 ... Pin,
15... Contact lever, 16... Torsion coil spring, 17... Contact, 18... Dog, 19... Cam follower, 21... Cam, 21a... Contact proximity guide section, 21b... First Locking groove, 21c...Second locking groove, 21d...Return guide groove, 21d'...
...Extension part, 21e...Top part, 21f...Protrusion, 2
1g... Vertical part, 22... Power supply, 23... Fan motor, 24... Fan, 102... Shutter,
104... Seesole lever, 105... Power switch.

Claims (1)

[Scope of utility model registration request] A ventilation fan that can rotate the fan when the shutter is open, stop the fan when the shutter is open, and stop the fan when the shutter is closed has a spring 7 that biases the shutter 2 in the closing direction and is mechanically connected to the shutter 2. A contact lever 15 is pivotally attached at one end to the switch slide 9 and is biased by a spring 16 in a direction away from a contact 17 that energizes the fan motor 23. The contact lever 15 can press the contact 17 and has a cam follower at the tip child 19 is provided, shutter 2
A contact proximity guide portion 21 that guides the cam follower 19 to a position where the shutter 2 is opened by the forward movement of the switch slide 9 from the original position of closed and contact 17 open, and the contact 17 is closed by the contact lever 15.
a, a first locking groove 21b that stops the cam follower 19 by a minute displacement in the backward movement direction of the switch slide 9 while keeping the shutter 2 open and the contact 17 closed;
a second locking groove 21c that guides the cam follower 19 to a position where the contact lever 15 opens the contact 17 while the shutter is open due to the slight movement of the switch slide 9;
A cam 21 is fixedly provided with a return guide groove 21d that guides the cam follower 19 to the original position so that the shutter 2 is closed by the return movement of the switch slide 9 and the contact 17 is kept open. ventilation fan.