JPH01127829A - Shutter device for ventilating fan - Google Patents

Abstract

PURPOSE:To permit the holding of the closed position of a shutter as well as the simple releasing of the closing and holding of the same upon opening the shutter by a method wherein equal forces having the same sense are applied on both sides of the supporting parts of a lock plate to retreat the recessed section of the lock plate from a shaft member at the back side of a connecting plate from the side of the same member by applying the tensile force of the lock plate when shutter blades are opened. CONSTITUTION:When an opening force is applied on shutter blades 4, being closed, equal forces, having the same sense, are applied on both fore-and-aft sides of the supporting parts of a lock plate 10 through the pins 7, 8 of a connecting plate 6 whereby the pivoting of the lock plate 10 is precluded. When a pulling string is pulled, a downwardly pivoting force is operated on the lock plate 10 from the side of the connecting member 16 to pivot only the lock plate 10 and retreat the recessed part 12 of the rear end rim of the lock plate 10 from the pin 8 whereby the connecting plate 6 may be pivoted downwardly, and respective shutter blades 4 are opened simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a ventilation fan shutter device for opening and closing a ventilation opening of a ventilation fan.

[Prior Art] A conventional shutter device for a ventilation fan includes a shutter blade that is supported on the ventilation fan main body side as a fulcrum for opening/closing movement at the midpoint of an arm that enters into the ventilation fan main body, and an opening/closing movement of the shutter blade in the arm portion. The puller includes a vertically movable connecting plate that is rotatably connected to the connecting fulcrum with the connecting fulcrum at a position retracted from the fulcrum of movement, and has an interlock mechanism attached to the connecting plate and the lower part of the ventilation fan body. It has a structure in which the sliding rod of the string switch is connected with a connecting member. Multiple shutter blades are connected by connecting plates,
When the connecting plate is moved downward by pulling the pull string of the pull string switch, it opens and is maintained open by the action of the interlock mechanism. When the interlock is released by pulling the drawstring again, each shutter blade closes due to its own weight and the biasing force of the elastic member. This type of shutter device is disclosed in Japanese Utility Model Application Publication No. 57-188021 and Japanese Utility Model Publication No. 55-5874.

[Problems to be Solved by the Invention] In the conventional ventilation fan shutter device described above, when an opening force is applied to the shutter blade in the closed state, the interlock mechanism is released, so the connecting plate is also attached to the shutter blade. The shutter blade can be moved open. Therefore, there is a problem that the shutter blade may flap due to external wind or the like. Some shutter blades are equipped with a mechanism to keep the shutter blade closed when closed, but the mechanism is extremely complicated.
Since the structure is such that an operating force is applied indirectly to the connecting plate, force is required to open and close the shutter blade, which poses a problem in that opening and closing the shutter blade feels heavy.

This invention has been made to solve such conventional problems, and is a ventilation fan that can hold the shutter blade in the closed position when closed, and can easily release the closed holding when opened, and has a simple configuration and does not require large operating force. The purpose of this invention is to obtain a shutter device.

[Means for Solving the Problems] A shutter device for a ventilation fan according to the present invention has an arm portion that is disposed vertically in a ventilation opening at the rear end of the ventilation fan main body and that enters into the front side of the ventilation fan main body, A plurality of shutter blades are rotatably supported on the ventilation fan body at the intermediate point of the arm portion, and the distal ends of each of the arm portions are rotatably connected to each other in the vertical direction at the shaft support of the shutter blade. a connecting plate that can be rotated; front and rear shaft members that are planted apart from each other in the front and back direction in front of the rotational fulcrum of the connecting plate; and a pivot that is rotatably supported on the ventilation fan body between the shaft members. On the front side of the shaft support, there is a rectangular long hole for connecting to the front shaft member, and on the rear side of the shaft support, the end edge thereof is close to the rear shaft member. A lock plate having a concave portion, a connecting member that vertically connects a pull string switch having an interlock mechanism and a connecting portion between the shaft support of the lock plate and the shaft member on the front side, and a connecting member that connects the lock plate at all times. It is equipped with an elastic member that is biased in a direction to rotate it upward.

[Operation] In this invention, when a force in the direction of opening the shutter blade in the closed state is applied, an equal force in the same direction is applied to both sides of the shaft support of the lock plate via the front and rear shaft members provided on the connecting plate. As a result, the lock plate cannot rotate on the shaft support, and neither the shutter blade nor the connecting plate can move. When a tensile force is applied to the lock plate from the connecting member side, the lock plate rotates downward, but within the rotation range allowed by the long hole in the downward rotation, the recess of the lock plate is separated from the shaft member on the rA side of the connecting plate, so that it becomes connected to the front shaft member, and as the lock plate rotates, the connecting plate moves and each shutter blade opens. Then, when the connecting member is released, both the elastic member and the shutter blade's own weight act to close the shutter blade, and the lock plate returns to the state where it cannot rotate again.

[Embodiment] Figures 1 to 3 all show a shutter device for a ventilation fan as an embodiment of the present invention. The shutter device of this example is disposed vertically in a ventilation opening on the back side of the ventilation fan body 1, and is located between an arm portion 2 that enters the front side (left side in the figure) of the ventilation fan body 1. A plurality of (three in the illustrated example) shutter blades 4 each having a shaft support 3 for opening/closing motion in the arm portion 2, and an end portion of each shutter blade 4 separated forward from the shaft support 3 for opening/closing motion in the arm portion 2. It is provided with a connecting plate 6 which is connected with its side as a connecting fulcrum 5 and can be rotated in the vertical direction.

In each shutter blade 4, a shaft formed on a bin plate screwed to the left and right inside of the ventilation opening of the ventilation fan body 1 is passed through a hole provided in the middle part of the arm portion 2, and the shaft support 3 is configured. Each of the shaft supports 3 can rotate within a vertical plane. A connecting plate 6 connecting each shutter blade 4 is formed in an L-shape or a single-shape, and an elastic pin made of an elastic material is passed through a hole provided in each arm portion 2 of the shutter blade 4. A connecting fulcrum 5 is formed to connect each shutter blade 4 in an interlocking relationship in the vertical direction. Two pins 7.8 are installed in a portion of the connecting plate 6 that extends forward from the blade connecting side, spaced apart from each other in the front-rear direction, and protrude laterally. A pin 9 is also implanted in the ventilation fan body 1 between the front and rear pins 7.8. These pins 7°8.9 are arranged so as to constitute each vertex of a nearly right triangle, with pin 9 located at the lowest position.

The spacing between pins 7 and 9 is greater than the spacing between pins 8 and 9, and slightly smaller than the spacing between pins 7.8. A lock plate 10 whose planar shape is approximately unequal trapezoid is attached to the pin 9 so as to be rotatable in a vertical plane. This lock plate 10 is formed with an elongated hole 11 in the shape of a lattice for inserting the front pin 7 into the lock plate 10 on the front side of the pivot support by the pin 9, and an end on the rear side of the pivot support. A recess 12 close to the rear pin 8 is formed on the edge. The elongated hole 11 extends in the vertical direction, and extends with its upper side bent rearward, and a hole formed for inserting the pin 8 during installation is connected to the hole 13. One end of a spring 14, which is fixed to the upper part of the ventilation fan body 1, is fixed to the upper side of the elongated hole 11 of the lock plate 10, and a biasing force is always applied to rotate upward (clockwise direction). There is. When this biasing force is applied, the pin 7 is in contact with the lowermost end of the elongated hole 11 of the lock plate 10, and the pin 8 is close to or in contact with the recess 12 of the lock plate 10 (see FIG. 1).

A pull cord switch 15 with an interlock mechanism attached to a portion between the pins 9 and 7 of the lock plate 10 and the lower part of the ventilation fan body 1 is connected to a connecting member 1 above and below.
6, and is configured such that the tensile force caused by pulling the pull string of the pull string switch 15 acts on the lock plate 10 as a force to rotate it downward (in the counterclockwise direction in the figure).

In this ventilation fan shutter device, even if a force is applied to the closed shutter blade 4 in the direction of opening it, the shutter blade 4 is closed and does not move. When the side force acts, an equal force in the same direction (-downward) acts on both the front and rear sides of the shaft support of the lock plate 10 via the front and rear pins 7.8 provided on the connecting plate 6, and the lock plate 10 It becomes impossible to rotate around pin 9 of the pivot support.

If the lock plate 10 cannot be rotated, the shirt will not turn.

Neither the tab blade 4 nor the connecting plate 6 can move.
Therefore, even if external wind or the like acts on the shutter blade 4 in the closed state, the shutter blade 4 will not flap. A force is applied to the lock plate 10 to rotate it downward. Then, at first, only the lock plate 10 rotates counterclockwise within the range allowed by the vertical length of the elongated hole 11 of the lock plate 10. As only the lock plate 10 rotates, the recess 12 on the rear edge of the lock plate 10 retreats from the pin 8 on the rear side of the connecting plate 6, and after the pin 7 comes into contact with the upper end of the elongated hole 11, it becomes free. The connecting plate 6 is connected to the lock plate 10 by the pin 7, and as the lock plate 10 rotates, the connecting plate 6 rotates downward to open the shutter blades 4 all at once. During this time pin 7
When the drawstring is pulled to the end of the stroke of the drawstring switch 15, the interlock mechanism is activated and the locking state is established.
Each shutter blade 4 is held open.

When the drawstring is pulled after this, the interlock mechanism is unlocked, and the locking force of the spring 14 that pulls the lock plate 10 upward and the weight of the shutter blade 4 causes the lock to shake. direction, the connecting plate 6 is also pulled up, and the shutter blades 4 are closed all at once. After the lock plate 10 has been rotated to the position where the shutter blade 4 is closed, the concave portion 12 on the rear edge of the lock plate 10 is again in a position close to or in contact with the bin 8, thereby holding the shutter blade 4 in the closed state. In other words,
The shutter blade 4 can be reliably held in the closed position when closed, the closed holding can be easily released by a normal opening operation, and a tensile force can be applied directly to the connecting plate 6 with a simple configuration. This provides a ventilation fan shutter device that does not require large operating force.

[Effects of the Invention] As is clear from the description of the embodiments, according to the present invention, when a force in the direction of opening the shutter blade in the closed state is applied, the force is applied to the shutter blade through the front and rear shaft members provided on the connecting plate. As a result, an equal force in the same direction acts on both sides of the lock plate's shaft support, and the lock plate cannot rotate on the shaft support, and neither the shutter blade nor the connecting plate can move, and a tension is applied to the lock plate from the connecting member side. When a force is applied, the lock plate rotates downward, and within the rotation range allowed by the long hole in the downward rotation, the recess of the lock plate separates from the shaft member on the rear side of the connecting plate. Therefore, the lock plate can be rotated freely. Therefore, the shutter blade can be securely held in the closed position without flapping when the shutter blade is closed, and the above-mentioned closed holding can be easily released by the normal opening operation. Since the actuator acts on the actuator, it also has the advantage that the operating force does not become large.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a shutter device as an embodiment of the present invention when it is closed, FIG. 2 is a side sectional view showing the lock plate when it is unlocked, and FIG. 3 is a side sectional view showing the same when the lock plate is unlocked. In Figure 0, which is a side sectional view showing the situation,
1 is the ventilation fan body, 2 is the arm part, 3 is the shaft support, 4 is the shutter blade, 5 is the connection fulcrum, 6 is the connection plate, 7° 8.9
10 is a lock plate, 11 is a long hole, 12 is a recessed portion, 14 is a spring, 15 is a drawstring switch, and 16 is a connecting member. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Masuo Oiwa (2 people from Ike) Figure 1/l・j:j! -f: 5717 Figure 2, Figure 3I! lJ

Claims (1)

[Claims] A plurality of pieces are disposed vertically in a ventilation opening at the rear end of the ventilation fan body, have an arm portion that enters the front side of the ventilation fan body, and are each pivotably supported on the ventilation fan body at a midpoint of the arm portion. a shutter blade, a connection plate to which the distal ends of each of the arms are rotatably connected, and which can rotate in the vertical direction on the shaft support of the shutter blade;
The front and rear shaft members are planted apart from each other in the front and back direction on the front side of the rotation fulcrum of this connecting plate, and are rotatably supported on the ventilation fan body between the shaft members, and the A lock plate having a rectangular long hole for connecting to the front shaft member, and having a concave portion at the end edge of the lock plate on the rear side of the shaft support, which is close to the rear shaft member; A connecting member that vertically connects a connecting portion between the shaft support and the front shaft member and a pull string switch having an interlock mechanism, and a connecting member that is always biased in a direction to rotate the lock plate upwardly. including an elastic member that is
The concave portion of the lock plate is configured to move away from the shaft member on the rear side of the connection plate within a rotation range allowed by the elongated hole when the lock plate is rotated downward by the connection member. A ventilation fan shutter device characterized by: