JPH0452355B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] 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. The present invention relates to a door closer in which a spring is built into the cylinder so that the formed rack 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.

[Conventional technology]

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

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

[Problem to be solved by the invention]

However, none of these methods allows the door to be stopped at any intermediate position between the fully closed position and the fully open position and to be automatically held at that position. Therefore, conventionally, there was no need to fully open the door, and if you wanted to open it at an arbitrary position in the middle, you had to manually support the door when it was opened at the arbitrary position, or manually adjust the fully closed position. It was hot (Jitko Showa 47-13351
(Refer to Japanese Patent Application Laid-open No. 135441/1983).

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.

[Means to solve the problem]

The technical means for achieving this technical problem is that the first cylinder 3 is slidably inserted into the first cylinder 3.
A rack 5 formed on the piston 4 meshes with a pinion 6 attached to an output shaft 7 that is linked to the opening and closing of the door, and a spring 8 that always biases the first piston 4 in the door closing direction is connected to the first cylinder 3. The door closer is connected to the cylinder chambers 9 and 10 of the first cylinder 3 through a check valve 25 that allows pressure fluid to flow when the door is moved in the opening direction, and is connected to the output shaft. A brake rotating plate 11 is connected to the brake rotating plate 11 via a transmission mechanism 31 that rotates in conjunction only when the door moves in the closing direction.
A brake shoe 15 is provided which is constantly pressed by a spring 23 to generate braking force.
5 is provided in parallel with the check valve 25, and receives fluid pressure from the first cylinder 3 when the door moves in the closing direction, and biases the brake shoe 15 and the brake rotary plate 11 in a direction to separate them. 2nd cylinder 1
6. A door closer with an optional open position holding device, characterized in that a second piston 17 of No. 6 is provided, and the cylinder chambers 18 and 19 of the second piston 17 are communicated through a throttle passage 28.

[Effect]

When the fully closed door is manually opened, pressure fluid flows between the cylinder chambers 9 and 10 of the first cylinder 3 via the check valve. In addition, since the output shaft 7 that is linked to the door is not connected to the brake rotation plate 11 by the transmission mechanism 31, no braking force is generated even if the brake shoe 15 is pressed against the brake rotation plate 11 by the spring 23. , the door opens smoothly.

When the door is stopped at an arbitrary open position, the spring 8 installed in the first cylinder 8 tries to move the door in the closing direction, but the transmission mechanism 31 causes the output shaft 7 and the brake rotary plate 11 to interlock. Spring 23
The brake shoe 15 is pressed against the brake rotating plate to generate a braking force, and the door is held at an arbitrary open position.

Thereafter, when the door held at an arbitrary position is manually held and forcibly closed in the closing direction, the second piston 17 of the second cylinder 16, which is provided in parallel with the check valve 25 and receives the fluid pressure from the first cylinder 3, opens. Spring 2
3, the brake shoe 15 and the brake rotary plate 11 are separated, and the separated position of the brake shoe 15 is maintained by the pressure difference generated between the cylinder chambers 16 and 18 via the throttle passage 28. The door is automatically closed to the fully closed position by the spring 8 in the first cylinder 3. When the door reaches the fully closed position,
The pressure difference between the cylinder chambers 16 and 18 is eliminated by the throttle passage 28, and the second piston 17 returns to its original state in which the brake shoe 15 is pressed against the brake rotating plate 11 by the urging force of the spring 23.

When the door is stopped at an arbitrary position in this way, the door is automatically held at the arbitrary open position.

〔Example〕

Examples to which the present invention is applied will be described below. In the figure, the door closer mainly includes a cylinder device 1, a brake mechanism 2, and a speed increasing gear mechanism 30. The cylinder device 1 has its first cylinder body 3
A first piston 4 having a rack 5 therein is slidably inserted, and a pinion 6 attached to an output shaft 7 interlocked with the door meshes with the rack 5. The first cylinder main body 3 is divided into two cylinder chambers 9 and 10 by the first piston 4, and the first piston 4 is connected via a rack 5, a pinion 6, and an output shaft 7 in the direction of closing the door ( A spring is provided in the cylinder chamber 9 to press in the direction A in the figure. A transmission mechanism 31 such as a ratchet that transmits rotational force in only one direction is connected to the output shaft 7 via a speed increasing gear mechanism 30.
Then, the brake rotary plate 11 of the brake mechanism 2 is connected. This transmission mechanism 31 has a function of disconnecting the output shaft 7 and the brake rotating plate 11 when the door moves in the opening direction, and interlocking the output shaft 7 and the brake rotating plate 11 when the door moves in the closing direction. I have it too. In the brake mechanism 2, a second piston 17 is slidably inserted into the second cylinder body 16, and two cylinder chambers 18 and 19 are formed in the second cylinder body 16 by the second piston 17. The second piston 17 is provided with a piston rod 20, and a brake shoe 15 is attached to the tip of the piston rod 20 extending toward the cylinder chamber 18 side. This brake shoe 15 is constantly pressed against the brake rotating plate 11 by a spring 23. The cylinder chamber 10 in the first cylinder body 3 is connected to the first cylinder chamber 10 through a cushion mechanism 32.
The passage 24 is connected to the cylinder chamber 9 via a check valve 25 and a second passage 26 . This check valve 25 allows flow only in the direction 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 , the cylinder chamber 19 communicates with the second passage 26 , and both cylinder chambers 18 and 19 communicate with a throttle passage 28 provided in the second piston 17 . It's communicating.

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

First, if you want to open the door, manually open the door, and the output shaft 7 and pinion 6 will rotate.
The first piston 4 moves to the right in the figure via the rack 5 against the spring 8. At this time, the fluid in the cylinder chamber 9 flows from the second passage 26 into the cylinder chamber 10 via the check valve 25 and the first passage 24. Therefore, the second piston 17 is moved to the left in the figure by the spring 23 and presses the brake shoe 15 against the brake rotation plate 11. However, since the output shaft 7 is connected to the brake rotating plate 11 from the speed increasing gear mechanism 30 via the transmission mechanism 31, the brake rotating plate 11
Even if it is restrained by the brake shoe 15,
Since the output shaft 7 rotates in the opening direction by the transmission mechanism 31 without being restrained by the brake rotary plate 11, there is no problem with the door opening operation.

Next, if you want to hold the opened door at 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 toward the left in the figure. (closed direction),
Since the output shaft 7 and the brake rotor plate 11 are interlocked for rotation in the closing direction by the transmission mechanism 31, the brake rotor plate 11 tries to rotate in the closing direction, but the spring 23
Therefore, the brake shoe 15 is connected to the brake rotating plate 11.
Since the output shaft 7 is pressed and the brake is applied, rotation of the output shaft 7 in the closing direction is prevented and the door is 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, and the first passage 24
The cylinder chamber 1 in the second cylinder body 16 via
The pressure inside 8 increases. Therefore, the second piston 17 moves to the right in the figure against the spring 23, and the brake shoe 15 is separated from the brake rotating plate 11, thereby releasing the brake. After that, even if the hand is released from the door, since the brake is released, the first piston 4 continues to move to the left in the figure due to the elastic force of the spring 8, and the door moves in the closing direction. At this time, pressure continues to be generated in the cylinder chamber 10 by the spring 8,
Due to the pressure difference between the two cylinder chambers 18 and 19 due to the throttle passage 28 of the second piston 17, the second piston 1
7 is pressed rightward in the figure, so the brake continues to be released. When the door reaches the fully closed position,
The first piston 4 stops and the pressure inside the cylinder chamber 10 decreases, and the pressure difference between the two cylinder chambers 18 and 19 is also eliminated, so the second piston 17 is moved by the spring 23.
Move to the left in the diagram and brake 15.
is pressed against the brake rotating plate 11 to apply the brake.

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

〔Effect of the invention〕

As is clear from the above, according to the above-mentioned technical means, the door can be held at any open position simply by stopping the door at any position, and this can be done with an extremely simple operation. Additionally, the door can be stopped at any position from the fully closed position to the fully open 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, 15 ... Brake shoe, 16 ... Second cylinder body, 17
...Second piston, 20...Piston rod, 2
3... Spring, 24... First passage, 25... Check valve, 26... Second passage, 28... Throttle passage, 31
...transmission mechanism.

Claims (1)

[Claims] 1 A rack formed on the first piston slidably inserted into the first cylinder is engaged with a pinion attached to an output shaft that is linked to opening and closing of the door, and the first piston is slidably inserted into the first cylinder.
A door closer in which a spring that constantly biases a piston in a door closing direction is installed in the first cylinder, and allows pressure fluid to flow between the cylinder chambers of the first cylinder when the first cylinder moves in the door opening direction. A brake rotary plate is connected to the output shaft via a check valve, and a brake rotary plate is connected to the output shaft via a transmission mechanism that rotates in conjunction only when the door moves in the closing direction, and is constantly pressed by a spring to control the output shaft. A brake shoe that generates power is provided, and the brake shoe is provided in parallel with the check valve, and receives fluid pressure from the first cylinder when the door moves in the closing direction to cause the brake shoe to rotate. A second piston of a second cylinder is provided which urges the plate away from the plate, and this second piston is provided.
A door closer with an arbitrary open position holding device, characterized in that cylinder chambers of a piston are communicated through a throttle passage.