JPH0532550B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door closer that returns a door provided at an entrance or exit of a building from an open position to a fully closed position. This invention relates to a door closer in which a spring is built into the cylinder and meshes with a pinion attached to an output shaft that is linked to the opening and closing of the door, and constantly biases the piston in the door closing direction.

BACKGROUND ART Conventionally, a door closer is attached to a door and is always energized toward a fully closed position to automatically close an open door.

Furthermore, some door closers are designed to hold the door in a fully open state once it is fully opened.

However, none of these methods allows the door to be stopped at any intermediate position between the front closed position and the fully open position and to automatically maintain that position. Therefore, in the past, if you did not need to fully open the door and wanted to open it at any position in between, you would either manually support the door when it was opened at any position, or you would place a separate holder between the door and the floor. It was necessary to support it by pinching it.

Therefore, in the present invention, when the door is stopped at an arbitrary position between the fully closed position and the fully open position,
The technical problem is to be able to automatically hold the door in its stopped position.

The technical means to achieve this technical problem is to connect a brake rotary plate to the output shaft that is linked to the door, so that the brake does not act on the brake rotary plate when the door is opened or closed, and the door stops. In some cases, a brake mechanism is provided in which the brake acts on the brake rotary plate.

This action is such that when a fully closed door is manually opened, the door opens smoothly because the brake of the brake mechanism is not acting on the brake rotating plate that is interlocked with the door via the output shaft. When the door is stopped at an arbitrary open position, a brake is applied to the brake rotation by a brake mechanism to hold the door at the open position. After that, if you want to close the door that has been opened at a desired position, manually force the door in the closing direction. This will release the brake of the brake mechanism that was acting on the brake rotating plate, so the door will be closed by the door closer. A spring automatically operates to the fully closed position. When the door is stopped at an arbitrary position in this way, it can be automatically held at that position.

As is clear from the above, according to the above-mentioned technical means, the door can be held at any position simply by stopping it at a desired position, and this can be done with extremely simple operation. Additionally, the door can be opened and stopped at any position from the fully closed position to the fully open position.

Examples to which the present invention is applied will be described below. In the figure, the door closer mainly consists of a cylinder device 1 for opening and closing the door and a brake mechanism 2 for stopping the door. The cylinder device 1 is the first
A first piston 4 is slidably inserted into the cylinder body 3, a rack 5 is formed on the first piston 4, and a pinion 6 that meshes with the rack 5 is provided. An output shaft 7 is connected to this pinion 6, and a door (not shown) is interlocked with this output shaft 7. The first cylinder body 3 is divided into two cylinder chambers 9 and 10 by the first piston 4,
The direction in which the first piston 4 is moved through the rack 5, pinion 6, and output shaft 7 to close the door (direction A in the figure)
A spring 8 is provided in the cylinder chamber 9 to press the cylinder. On the other hand, the brake mechanism 2 includes a brake rotating plate 11 attached to the output shaft 7, and a brake shoe 15 attached to a brake arm 14 whose one end is rotatably supported by a shaft 13 on a bracket 12.
This brake shoe 15 is the brake rotating plate 1
1 can come into contact with it. Further, a second piston 17 is slidably inserted into the second cylinder body 16, and two cylinder chambers 18 and 19 are formed within the second cylinder body 16 by the second piston 17. A piston rod 20 is connected to the second piston 17, and the pressure receiving areas of the second piston 17 on both cylinder chambers 18 and 19 sides are made the same. A pin 21 is attached to the tip of the piston rod 20 extending toward the cylinder chamber 18, and this pin 21 engages with an elongated hole 22 formed at the other end of the brake arm 14. Furthermore, a spring 23 is provided between the other end of the brake arm 14 and the second cylinder body 16, and acts to press the brake shoe 15 against the brake rotation plate 11 via the brake arm 14.

A first passage 24 communicating with the cylinder chamber 10 in the first cylinder body 3 is connected to a second passage 26 communicating with the cylinder chamber 9 via a check valve 25. This check valve 25 allows flow from the second passage 26 to the first passage 24 . The cylinder chamber 18 in the second cylinder body 16 communicates with the first passage 24, and the cylinder chamber 19 communicates with the second passage 26 via a reverse valve 27 that allows flow in the direction of the second passage 26. . Said second piston 17
A throttle passage 28 is formed in which the cylinder chamber 18 and the cylinder chamber 19 communicate with each other.

The operation of the embodiment configured as described above will be explained.

First, when you want to open the door, when you manually open the door, the output shaft 7 and pinion 6 that are interlocked with the door rotate clockwise in the figure (opposite to the A direction), and the first piston 4 is moved by the spring 8. move to the right in the figure against the At this time, the fluid in the cylinder chamber 9 flows into the cylinder chamber 10 from the second passage 26 via the reverse valve 25 and the first passage 24. Therefore, the second piston 17 is in the state shown in the figure, and the brake shoe 15 attached to the brake arm 14 by the spring 23 comes into contact with the brake rotation plate 11. However, since the brake rotating plate 11 rotates clockwise with the rotation of the output shaft 7, the brake arm 14 has a spring 23.
A moment is generated that tries to rotate the brake rotor plate 11 counterclockwise, and the braking force acting on the brake rotor plate 11 is reduced, so the brake rotor plate 1 is substantially rotated.
Since the brake does not act on 1, there is no problem in opening the door.

Next, when you want to hold the opened door in an arbitrary open position, when you manually stop the door at the arbitrary position and then release your hand from the door, the restoring force of the spring 8 causes the first piston 4 to move to the left in the figure. The brake rotating plate 11 is pressed in the direction of the
tries to rotate counterclockwise (direction A), but
Due to the clockwise rotation moment acting on the brake arm 14 due to the movement of the brake rotating plate 11 and the elastic force of the spring 23, the brake shoe 15 is
is pressed against the brake rotary plate 11, so a brake is acting on the brake rotary plate 11. Therefore, the first piston 4 does not move and the door is also held in its open position.

If you want to close the door held in this open position, manually force the door in the closing direction, and the first piston 4 will be pushed to the left in the figure.
The pressure inside the cylinder chamber 10 increases. This fluid pressure is transmitted from the first passage 24 to the cylinder chamber 18 in the second cylinder body 16, and the second piston 17 moves downward in the figure against the spring 23. For this reason, the brake arm 14 is pulled downward in the drawing around the shaft 13 via the piston rod 20, and the brake shoe 15 is separated from the brake rotary plate 11 and the brake is released. After that, even if you release your hand from the door, the brake is released, so the first piston 4 moves to the left in the figure due to the elastic force of the spring 8, and the first piston 4 moves to the left in the figure to open the door via the rack 5, pinion 6, and output shaft 7. move in the closing direction. At this time, pressure continues to be generated in the cylinder chamber 10 due to the movement of the first piston 4 by the spring 8, and the fluid in the cylinder chamber 10 flows from the first passage 24 through the cylinder chamber 18, the throttle passage 28, and the cylinder chamber 19. It flows into the cylinder chamber 9 from the second passage 26 . Since a pressure difference is maintained between the cylinder chambers 18 and 19 by the throttle passage 28, the second piston 17 continues to be pressed downward in the figure. When the door moves to the fully closed position, the first piston 4 stops and the pressure inside the cylinder chamber 10 decreases.
Since the pressure difference between the cylinder chambers 18 and 19 is also eliminated, the second piston 17 is moved upward in the figure by the spring 23, and the piston rod 20 is also moved upward. Therefore, the brake shoe 15 is pressed against the brake rotating plate 11 via the brake arm 14, and the brake is applied.

In this way, the door can be opened and closed and the door can be held open at any position.

[Brief explanation of drawings]

The figure is a schematic sectional view of a door closer to which the present invention is applied. 1... Cylinder device, 2... Brake mechanism, 3
...First cylinder body, 4...First piston, 5
...Rack, 6...Pinion, 7...Output shaft, 8
... Spring, 11 ... Brake rotating plate, 14 ... Brake arm, 15 ... Brake shoe, 16 ...
...Second cylinder body, 17...Second piston, 2
0... Piston rod, 23... Spring, 24...
First passage, 25, 27... Check valve, 26... Second
Passage, 28...Aperture passage.

Claims (1)

[Claims] 1 A rack formed on a piston slidably inserted into the cylinder is engaged with a pinion attached to an output shaft that is linked to the opening and closing of the door, and a spring is inserted into the cylinder that constantly biases the piston in the door closing direction. In the door closer installed in the interior, a brake rotating plate is connected to the output shaft, and the brake does not act on the brake rotating plate when the door is opened/closed, and the brake acts on the brake rotating plate when the door is stopped. A door closer with an optional open position holding device, characterized by being provided with a mechanism.