Ventilation system

Abstract

We provide ventilation equipment. [Solution] The fall prevention unit 1 comprises a first bracket 10 attached to the indoor side surface 73A of the frame 73, a second bracket 20 attached to the side surface 74A of the shielding plate 74 facing the opening, and a first rod-shaped member 30 and a second rod-shaped member 40 made of synthetic resin sheets. The first rod-shaped member comprises a first mounting end attached to the first bracket, a first free end provided opposite to the first mounting end, and a first intermediate portion provided between the first mounting end and the first free end. The second rod-shaped member comprises a second mounting end attached to the second bracket, a second free end provided opposite to the second mounting end, and a second intermediate portion provided between the second mounting end and the second free end. The first free end of the first rod-shaped member has a first through hole that is smaller than the second free end of the second rod-shaped member, and the second intermediate portion of the second rod-shaped member is passed through the first through hole of the first rod-shaped member.

Claims

1. A main body having a lower surface formed with an intake port for taking in indoor air or an outlet port for blowing out outside air, to which a duct is connected, A cylindrical opening extending downward from the lower surface of the main body, A frame portion extending in a flange shape from the lower end of the aforementioned opening, with its outer and inner edges being rectangular in shape, A shielding plate is provided to the frame portion so as to be openable and closable, and its outer edge is square in shape. It includes a fall prevention part that prevents the shielding plate from falling, The aforementioned fall prevention part is A first bracket attached to either the lower surface of the main body, the inside of the opening, or the interior side surface of the frame, A second bracket is attached to the side of the shielding plate facing the opening, It comprises a first rod-shaped member and a second rod-shaped member made of a synthetic resin sheet, The first rod-shaped member is, The first mounting end attached to the first bracket, A first free end is provided opposite the first mounting end, It comprises a first intermediate portion provided between the first mounting end and the first free end, which is more elongated than the first mounting end and the first free end, The second rod-shaped member is The second mounting end attached to the second bracket, A second free end is provided opposite to the second mounting end, It comprises a second intermediate portion provided between the second mounting end and the second free end, which is more elongated than the second mounting end and the second free end, The aforementioned first bracket is A plate-shaped first base attached to the lower surface of the main body, the inner surface of the opening, or the indoor side surface of the frame, It comprises a plate-shaped first projection that protrudes from the end of the first base, The aforementioned second bracket is A plate-shaped second base attached to the shielding plate, It comprises a plate-shaped second projection that protrudes from the end of the second base, The constricted portion of the first mounting end of the first rod-shaped member is inserted into the first mounting hole that passes through the first protrusion of the first bracket. The constricted portion of the second mounting end of the second rod-shaped member is inserted into the second mounting hole that passes through the second protrusion of the second bracket. A ventilation device characterized in that the first free end of the first rod-shaped member has a first through hole formed to be smaller than the second free end of the second rod-shaped member, and the second intermediate portion of the second rod-shaped member is passed through the first through hole of the first rod-shaped member, or the second free end of the second rod-shaped member has a second through hole formed to be smaller than the first free end of the first rod-shaped member, and the first intermediate portion of the first rod-shaped member is passed through the second through hole of the second rod-shaped member.

2. The ventilation device according to claim 1, characterized in that a plurality of the aforementioned fall prevention parts are provided.

3. The frame portion is provided with four connecting members, each located between the four corners of the frame portion and the four corners of the shielding plate, which hold the shielding plate below the frame portion and also serve as shafts for opening and closing the shielding plate. The aforementioned connecting member is A ball support part made of synthetic resin is provided on one of the frame portion and the shielding plate, and the tip of the ball portion is spherical. The frame portion and the other of the shielding plate are provided with a ball receiving portion made of synthetic resin that detachably grips the ball portion of the ball support portion, The ball receiving portion of the connecting member grips the ball portion of the ball support portion, maintaining a closed state where the lower part of the opening is shielded by the shielding plate. In this closed state, the ball receiving portion of the connecting member has a wide gap that allows the ball connecting portion of the ball support portion, which is narrower than the ball portion, to be inserted onto an imaginary line connecting the centers of the ball portions of each other (excluding an imaginary line connecting the centers of the ball portions of the diagonally opposite connecting members). The ventilation device according to claim 2, characterized in that there are four ways of opening the shielding plate, wherein one of the four connecting members and another connecting member provided next to the one connecting member in the circumferential direction along the outer edge of the shielding plate are selected as the shaft for opening and closing.

4. The ventilation device according to claim 1 or claim 2, characterized in that the first rod-shaped member and the second rod-shaped member extend in a straight line, thereby restricting the shielding plate from opening completely.

5. The ventilation device according to claim 1 or claim 2, characterized in that the first rod-shaped member and the second rod-shaped member are flexible.

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