JPS6039422Y2 - door opening/closing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a door opening/closing device having a function of maintaining an automatic door in a closed position.

Generally, automatic doors sometimes open due to external forces such as wind pressure or pressure differences between indoors and outdoors.

Conventionally, in order to prevent such opening, pressure fluid from a fluid pressure source is stored in an accumulator, and when the door is closed, this pressure fluid is supplied via a switching valve to prevent the door from opening. Opening/closing devices have been proposed that prevent the door from opening by continuously supplying pressure fluid even when the door is in the closed position.

However, such conventional devices have problems such as the former requiring a separate accumulator, which increases the size of the opening/closing device, and the latter, which continues to supply pressurized fluid even in the closed position. However, there were problems such as an increase in power consumption and going against energy saving efforts.

Therefore, the present invention was developed in view of the above-mentioned problems.A small cylinder is provided inside the door drive cylinder, and pressure fluid is sealed in the chamber of this small cylinder to maintain the door open position. We provide a new door opening/closing device that releases the interior of the cylinder to release the door from the open position, and prevents the door from opening under normal conditions due to external forces such as wind pressure or pressure differences between indoors and outdoors, or manually. The purpose is to

The present invention will be described below based on an embodiment shown in the drawings.

The figure shows a case in which the present invention is applied to a door opening/closing device that converts linear motion due to the supply and discharge of pressure fluid into rotational motion and uses this rotational motion to open and close a door.

That is, a piston 2 is slidably inserted into the door drive cylinder body 1, a rack part 3 is formed in the center of the piston 2 in parallel to the sliding direction, and a pinion gear 4 that meshes with this rack part 3 is formed. It is pivotally supported on the cylinder body 1.

Two cylinder chambers 5, 5a are formed in the cylinder body 1 by the piston 2, and a port P1 connectable to a pressure fluid source (not shown) is connected to the cylinder chamber 5 from the passage through a check valve 7. It communicates with the end face side of the piston 2, and also communicates with the cylinder chamber 5 from the passage 6 through the cushion adjustment valve 8, and from the passage 6 with the cylinder chamber 5 through the speed adjustment valve 9 at a position to the right of the left end position of the piston 2 in the figure. It goes through.

On the other hand, the port P2 connectable to the pressure fluid source is the same as described above.
The passage 6a communicates with the end face side of the cylinder chamber 5a via the check valve 7a and the cushion adjustment valve 8a, and the passage 6a communicates with the left side of the right end position of the piston 2 in the figure via the speed adjustment valve 9a. .

If the door is in the closed position while the piston 2 is moving to the right as shown in the figure, then the piston 2
is formed with a long hole 10 opening to the cylinder chamber 5 side,
A hollow member 11 that is always fitted into the elongated hole 10 is fixed to the cylinder body 1, and the interior thereof and the elongated hole 10 are isolated from the cylinder chamber 5 to form a lock chamber 12.

This lock chamber 12 is connected to the port P1 via a check valve 13.
A lock release mechanism 14 is provided which is connected to the passage 6 communicating with the check valve 13 and stops the function of the check valve 13.

This lock release mechanism 14 is composed of a slidable valve 15, a chamber 16, 17 formed by this valve 15, and a push rod 18 provided on the valve 15.
The chamber 17 communicates with a port P3 into which pilot pressure for unlocking flows.

The push rod 18 can pass through the chamber 16 and come into contact with the check valve 13.

Note that the lock release mechanism for stopping the function of the check valve 13 is not limited to the above embodiment.

Next, the operation of an embodiment configured as described above will be explained.

First, when opening the door, pressure fluid is supplied from the pressure fluid source to port P2 based on the door opening signal, and this pressure fluid opens the check valve 7a and flows into the cylinder chamber 5a.
Port P1 is also connected to a tank (not shown).

At the same time, pilot pressure flows into the chamber 17 from the port P3 of the lock release mechanism 14, the valve 15 rises, and the push rod 18
This pushes up the check valve 13 and releases the sealed state of pressure fluid in the lock chamber 12.

Therefore, the piston 2 is pushed and moved to the left in the figure by the pressure fluid flowing into the cylinder chamber 5a, and the pressure fluid in the other cylinder chamber 5 is transferred from the passage 6 to the port via the speed adjustment valve 9 and the cushion adjustment valve 8. The pressure fluid in the lock chamber 12 is discharged from the passage 6 through the check valve 13 through the port P1.

The movement of the piston 2 causes the pinion gear 4 meshing with the rack portion 3 to rotate, and this rotational force is transmitted directly to the door to open the door, or transmitted via a chain or the like to open the door. do.

When the door is in the fully open position, that is, when the piston 2 approaches the left end in the figure, the port of the speed adjustment valve 9 is shut off, so the pressure fluid in the cylinder chamber 5 is discharged only from the cushion adjustment valve 8, and its flow rate is controlled. The cushioning effect works and the door slowly opens fully.

Next, when closing the door, pressure fluid is supplied from the pressure fluid source to port P1 based on the door closing signal, and port P
2 and port P3 connect to the tank.

Therefore, the pressure fluid flowing into port P1 is
is opened to flow into the cylinder chamber 5, and check valve 13 is opened to flow into the lock chamber 12.

At this time, the pressure fluid flowing into the port P1 flows into the chamber 16 of the lock release mechanism 14, pushes down the valve 15 together with the push rod 18, and normalizes the function of the check valve 13.

The piston 2 is pushed and moved rightward in the figure by the pressure fluid that has flowed into the cylinder chamber 5 and the lock chamber 12, and the pressure fluid in the other cylinder chamber 5 is moved through the speed adjustment valve 9a and the cushion adjustment valve 8a. From passage 6a to port 1
- Exhausted through P2.

This movement of the piston 2 causes the pinion gear 4 meshing with the rack portion 3 to rotate, and this rotational force is transmitted to the door to close the door.

When the door is in the fully closed position, that is, when the piston 2 approaches the right end in the figure, the port of the speed adjustment valve 9a is shut off, so the pressure fluid in the shilling chamber a is discharged only from the cushion adjustment valve 8a, and its flow rate is reduced. A controlled cushioning effect works and the door slowly closes completely.

In this way, the door is opened and closed by supplying and discharging pressure fluid to the ports P, P2.

When the door is currently fully closed, if a force is applied to open the door due to wind pressure or a difference in air pressure between indoors and outdoors, or if a force is applied manually to open the door, The opening force acts on the piston 2 via the pinion gear 4 and the rack part 3, and the piston 2 tries to move to the left in the figure, but due to the action of the check valve 13, the lock chamber 12
Since the pressure fluid inside is completely enclosed, the piston 2 does not move, that is, the door is held in the fully closed position.

Therefore, as long as the pressure fluid in the lock chamber 12 is sealed, the door will not be operated by external force and can be maintained in a fully closed state.

In addition, in the above embodiment, a door opening/closing device was described in which the linear motion of the piston due to the supply and discharge of pressure fluid is converted into rotational motion by the relationship between the rack and pinion, and this rotational motion directly or indirectly opens and closes the door. The present invention can be applied to various pressure fluid type door opening/closing devices, such as a door opening/closing device that opens and closes a door using the linear motion of a piston by supplying and discharging pressure fluid via its piston rod.

As is clear from the above, according to the present invention, a new chamber (lock chamber) is formed in one of the cylinder chambers of the door opening/closing device, and pressurized fluid is sealed in this chamber to maintain the door open position. This prevents the door opening/closing device itself from becoming larger.
In addition, if pressure fluid is sealed at one end (locked state), there is no need to continue supplying new pressure fluid, and the door can be reliably kept in the fully closed position against external forces due to wind pressure and pressure differences between indoors and outdoors, as well as manual opening force. It has the advantage of being able to retain

[Brief explanation of drawings]

The figure is a schematic diagram showing an embodiment of a door opening/closing device to which the present invention is applied. 1...Cylinder body, 2...Piston,
5, 5a...Cylinder chamber, 10...Elongated hole, 11...Hollow member, 12...Lock chamber, 13...Reverse Stop valve, 14...Lock release mechanism, Pl, P2. P3...Port.

Claims (1)

[Scope of utility model registration request] In a door drive cylinder that operates a piston to open and close a door by supplying and discharging pressure fluid, an elongated hole is formed at the end of the piston on the chamber side to which pressure fluid is supplied when the door is opened, and the cylinder is always fitted into this elongated hole. A hollow member is attached to the cylinder body, a lock chamber is formed within the hollow member and the elongated hole, and this lock chamber is connected to a pressure fluid supply and discharge passage through a check valve whose forward direction is flow toward the lock chamber. When the door is fully closed, the lock chamber is sealed and locked by the action of the check valve, and when the door is opened/closed, the lock chamber and the supply/discharge passage are brought into communication to stop the function of the check valve. A door opening/closing device characterized by being provided with a lock release mechanism.