JP3254118B2 - Speed adjustment device and speed adjustment method for door closer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed adjusting device and a speed adjusting method for a door closer, and more particularly to a speed adjusting device and a speed adjusting method for a door closer that can be controlled to keep a door closing speed appropriately.

[0002]

2. Description of the Related Art FIG. 10 shows a front view of a door closer attached to a door. The housing 2 of the door closer is fixed to the door 44, and the main shaft 12 protrudes from the housing 2. An arm 41 is connected to the main shaft 12.

On the other hand, an arm 42 is fixed to the frame 40 on the wall surface, and the arm 42 and the arm 41 connected to the main shaft 12 are connected by bolts 43. When the door 44 is opened and closed about the hinge 50,
The main shaft 12 is rotated by the arms 42 and 41.
After the door 44 is opened, the door 44 is opened by the door closer.
Automatically closes.

FIG. 11 is a plan sectional view of a door closer. The cylinder 3 in the housing 2 is filled with hydraulic oil, and the piston 4 is provided so as to be movable in the directions of arrows 91 and 92. The cylinder section 3 is separated into a first cylinder section 3a and a second cylinder section 3b by the piston 4, and the working oil is also filled in the piston internal space 4K. The piston 4 in the cylinder 3 is urged by a spring 8 in the direction of arrow 92.

When the door 44 (FIG. 10) is opened, the main shaft 12 rotates in the direction of arrow 94. A pinion 13 is fixed to the main shaft 12, and the pinion 13 is
And mesh with a rack 11 formed therein. When the main shaft 12 rotates in the direction of the arrow 94, the piston 4 moves in the direction of the arrow 91 against the spring 8.

A through hole 5 and a through hole 6 are formed in the piston 4. When the piston 4 moves in the direction of the arrow 91, the hydraulic oil in the first cylinder portion 3a passes through the through hole 5 and passes through the piston internal space. 4K through the through-hole 6
Move to the cylinder part 3b. A ball 7 that regulates the flow of the hydraulic oil in one direction is located near the through hole 6.

That is, while the piston 4 is moving in the direction of the arrow 91, the ball 7 is moving in the direction of the arrow 92 due to the momentum of the movement of the piston 4. Therefore, the through hole 6
Is open, so that the hydraulic oil can flow out of the piston internal space 4K toward the second cylinder portion 3b.

After the door 44 is opened, the piston 4 is moved and returned in the direction of arrow 92 by the bias of the spring 8. The movement of the piston 4 in the direction of the arrow 92 causes the main shaft 12 to move.
Rotates in the direction of arrow 93, whereby the door 44 automatically closes. When the door 44 is closed, it is necessary to maintain a relatively low speed and a constant speed in order to ensure safety and the like.

When the piston 4 moves in the direction of arrow 92, the ball 7 moves in the direction of arrow 91 to close the through hole 6. Thereby, the hydraulic oil located in the second cylinder portion 3b cannot pass through the through hole 6. In this case, the hydraulic oil in the second cylinder portion 3b flows out into the piston internal space 4K through the port 24, the oil passage 22, and the port 23.

A manual adjustment control valve 45 is screwed into the oil passage 22, and the movement amount of the hydraulic oil flowing from the port 24 to the oil passage 22 is restricted. By restricting the movement amount of the hydraulic oil, the pressure of the hydraulic oil is applied to the piston 4, the rotation of the main shaft 12 is suppressed, and the
Is relatively slow.

The manual adjustment control valve 4
Numeral 5 can be rotated from the outside of the housing 2 by a driver or the like. By this rotation operation, the manual adjustment control valve 45 moves the arrow 91,
It is possible to adjust the amount of hydraulic oil that advances and retreats in the 92 direction and flows out of the oil passage 22 from the port 24. That is, the closing speed of the door 44 can be adjusted by the manual adjustment control valve 45.

Here, in the closing operation of the door 44, for example, a strong wind may hit the door 44, and the door 44 may be rapidly closed at a high speed. In such a case, it is necessary to prevent a sudden closing operation of the door 44 in order to ensure safety and the like. When the door 44 receives an external factor such as a strong wind, the speed of the closing operation is suppressed in FIG.
And a conventional example as shown in FIG.

FIGS. 12 and 13 are enlarged views of the vicinity of the manual adjustment control valve 45 and the oil passage 22 shown in FIG. A cylinder 49 is fixed in the oil passage 22, and a valve 47 is located in the cylinder 49. The valve 47 is urged by a spring 48 in the direction of arrow 92. The valve 47 has a valve recess 47H. on the other hand,
A valve retainer 4 is provided at the tip of the manual adjustment control valve 45.
6 are provided, and the valve presser convex portion 46 of the valve presser 46 is provided.
T is fitted in the valve recess 47H.

The hydraulic oil from the second cylinder portion 3b passes through the port 24, passes through the valve space 47S, passes through the cylinder 49, the oil passage 22, and the port 23, and flows into the piston internal space 4K. When an external factor such as a strong wind is applied to the door 44 (FIG. 10) and the door 44 tries to close rapidly at a high speed, the movement of the piston 4 causes the hydraulic oil in the second cylinder portion 3b to abruptly move. Strong pressure is applied.

As a result, the valve 47 moves in the direction of arrow 91 against the spring 48. FIG. 13 shows a state in which the valve 47 has moved in the direction of the arrow 91. As shown in FIG. 13, the valve space 47S is closed by the movement of the valve 47, and the hydraulic oil from the second cylinder portion 3b cannot flow into the oil passage 22. As a result, the piston 4 shown in FIG.
Is prevented from moving in the direction of the arrow 92, and the door 44 is prevented from closing suddenly at a high speed. Actually, the hydraulic oil gradually flows out from the gap between the ball 7 and the through hole 6 and the valve space 47S, so that the door 44 is gradually closed.

[0016]

The conventional door closer has the following problems. When an external factor such as a strong wind is applied to the door 44, the valve 47 moves in the direction of arrow 91 to prevent the outflow of hydraulic oil. Therefore, when the valve 47 closes the valve space 47S, the speed of the closing operation of the door 44 rapidly decreases, and the closing speed of the door 44 changes stepwise. For this reason, the closing speed of the door 44 becomes unstable, and the closing operation of the door 44 rattles, giving an unpleasant impression.

Accordingly, an object of the present invention is to provide a speed adjusting device and a speed adjusting method in a door closer that can always maintain a door closing speed at an appropriate speed.

[0018]

According to a first aspect of the present invention, there is provided a speed adjusting device for a door closer, comprising: a speed adjusting mechanism for adjusting a closing speed of a door; a current speed detecting means for detecting a current closing speed of the door; Control means for controlling the speed adjusting mechanism based on the control signal.

According to a second aspect of the present invention, there is provided a speed adjusting device for a door closer, wherein the main shaft rotates according to the opening and closing operation of the door, a speed adjusting mechanism for adjusting a closing speed of the door, and a current speed detecting means for detecting a current rotational speed of the main shaft. And control means for controlling the speed adjusting mechanism based on the current rotational speed.

According to a third aspect of the present invention, there is provided a speed adjusting device for a door closer, wherein the speed adjusting device is positioned movably within a cylinder filled with hydraulic fluid and a first chamber and a second chamber. A piston that separates into chambers, the piston moving with rotation of the main shaft, a flow path for communicating hydraulic fluid in the first chamber and hydraulic fluid in the second chamber of the cylinder, and adjusting a flow rate of the hydraulic fluid flowing in the flow path. By controlling the flow rate adjusting means for changing the pressure of the hydraulic fluid with respect to the piston, the current speed detecting means for detecting the current rotational speed of the main shaft, the flow rate adjusting means based on the current rotational speed, and closing the door. Control means for adjusting the speed,
It is characterized by having.

According to a fourth aspect of the present invention, there is provided a speed control method for a door closer, comprising a piston movably positioned in a cylinder filled with a hydraulic fluid and separating the interior of the cylinder into a first chamber and a second chamber. A speed control method for a door closer having a piston moving with opening and closing, and a flow path for communicating a hydraulic fluid in a first chamber and a hydraulic fluid in a second chamber of the cylinder, wherein the flow is controlled based on a detected current closing speed of the door. By adjusting the flow rate of the hydraulic fluid flowing in the passage, the pressure of the hydraulic fluid on the piston is changed, and the closing speed of the door is adjusted.

[0022]

According to the first aspect of the present invention, there is provided a speed adjusting device for a door closer, comprising a control means for controlling a speed adjusting mechanism for adjusting a door closing speed based on a current closing speed detected by a current speed detecting means. .

As described above, by the feedback control based on the current door closing speed, the door closing speed can always be maintained at an appropriate speed. Therefore, for example, when the door attempts to close at a high speed due to an external factor such as a strong wind, the closing operation can be suppressed and the door closing speed can be appropriately maintained. Further, for example, when the closing speed of the door is low, it is possible to promote the closing operation and maintain the closing speed of the door appropriately.

According to a second aspect of the present invention, there is provided a speed adjusting device for a door closer, comprising a control means for controlling a speed adjusting mechanism for adjusting a closing speed of the door based on the current rotational speed of the spindle detected by the current speed detecting means. .

As described above, the feedback control based on the current rotational speed of the main shaft makes it possible to always maintain the door closing speed at an appropriate speed. Therefore, for example, when the door attempts to close at a high speed due to an external factor such as a strong wind, the closing operation can be suppressed and the door closing speed can be appropriately maintained. Further, for example, when the closing speed of the door is low, it is possible to promote the closing operation and maintain the closing speed of the door appropriately.

According to a third aspect of the present invention, there is provided a speed adjuster for a door closer, which controls a flow rate adjusting means for adjusting a flow rate of a working fluid flowing in a flow path based on a current rotational speed of a main shaft detected by a current speed detecting means. Control means for adjusting the closing speed of the door is provided.

As described above, by the feedback control based on the current rotational speed of the main shaft, the pressure of the hydraulic fluid on the piston can be controlled, and the closing speed of the door can always be maintained at an appropriate speed. Therefore, if the door attempts to close at a high speed due to external factors such as strong winds,
It is possible to suppress the closing operation and keep the door closing speed appropriately. Further, for example, when the closing speed of the door is low, it is possible to promote the closing operation and maintain the closing speed of the door appropriately.

According to a fourth aspect of the present invention, there is provided a speed control method for a door closer, comprising the steps of adjusting the flow rate of the hydraulic fluid flowing through the flow passage based on the detected closing speed of the door, thereby changing the pressure of the hydraulic fluid with respect to the piston. Adjust the closing speed of.

As described above, by the feedback control based on the current closing speed of the door, the pressure of the hydraulic fluid on the piston can be controlled, and the closing speed of the door can always be maintained at an appropriate speed. Therefore, for example, when the door attempts to close at a high speed due to an external factor such as a strong wind, the closing operation can be suppressed and the door closing speed can be appropriately maintained. Further, for example, when the closing speed of the door is low, it is possible to promote the closing operation and maintain the closing speed of the door appropriately.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speed adjusting device and a speed adjusting method in a door closer according to the present invention will be described with reference to the drawings.

[First Embodiment] FIG. 1 is an external front view of a door closer according to a first embodiment. A main shaft 12 protrudes from the housing 2, and an arm 41 shown in FIG. 10 is connected to the main shaft 12. Note that the main shaft 12 rotates according to opening and closing of the door 44 (FIG. 10).

A control unit 15 (control means) and an encoder 14 (current speed detection means) are provided below the housing 2. The encoder 14 detects the rotation speed of the main shaft 12. Since the encoder 14 is publicly known, its internal configuration is omitted. A motor 16 covered by an auxiliary case 26 is provided on a side surface of the housing 2. The motor 16 is fixed to the housing 2 by screws 25.

FIG. 2 is a plan sectional view of the door closer according to the present embodiment. Caps 9 and 10 are screwed into both ends of the housing 2, respectively, and a cylinder portion 3 is formed therein, and the cylinder portion 3 is filled with hydraulic oil. The piston 4 has an arrow 9 in the cylinder portion 3.
The piston 3 allows the cylinder 3 to move in the first and second directions.
) And a second cylinder portion 3b (second chamber). Through holes 5 and 6 are formed in the piston 4, and the working oil is also filled in the piston internal space 4K. In addition,
The piston 4 in the cylinder portion 3 is urged by a spring 8 in the direction of arrow 92.

When the door 44 (FIG. 10) is opened, the main shaft 12 rotates in the direction of arrow 94. A pinion 13 is fixed to the main shaft 12, and the pinion 13 is
And mesh with a rack 11 formed therein. That is,
The piston 4 moves with the rotation of the main shaft 12. In this case, as the main shaft 12 rotates in the direction of arrow 94, the piston 4 moves in the direction of arrow 91 against the spring 8.

By the movement of the piston 4 in the direction of the arrow 91, the hydraulic oil in the first cylinder portion 3a passes through the through hole 5, passes through the through hole 6 from the piston internal space 4K, and moves to the second cylinder portion 3b. . The ball 7 is located in the vicinity of the through hole 6, and while the piston 4 is moving in the direction of the arrow 91, the ball 7 is moving in the direction of the arrow 92 by the movement of the piston 4. For this reason, the through-hole 6 is open, and the hydraulic oil can flow out of the piston internal space 4K toward the second cylinder portion 3b.

After the door 44 is opened, the piston 4 moves and returns in the direction of arrow 92 by the bias of the spring 8. The movement of the piston 4 in the direction of arrow 92 causes the main shaft 12 to move.
Rotates in the direction of arrow 93, whereby the door 44 automatically closes. When the door 44 is closed, it is necessary to maintain a relatively low speed and a constant speed in order to ensure safety and the like.

When the piston 4 moves in the direction of arrow 92, the ball 7 moves in the direction of arrow 91 to close the through hole 6. Thereby, the hydraulic oil located in the second cylinder portion 3b cannot pass through the through hole 6. In this case, the hydraulic oil in the second cylinder portion 3b flows from the oil passages 27 and 21 formed in the cap 10 to the groove 20, the port 24,
It flows out into the piston internal space 4K through the oil passage 22 and the port 23.

A manual adjustment control valve 18 is screwed into the oil passage 22 to limit the amount of hydraulic oil flowing out of the port 24 to the oil passage 22. By restricting the movement amount of the hydraulic oil, the pressure of the hydraulic oil is applied to the piston 4, and the rotation of the main shaft 12 is suppressed, so that the door 4
The closing speed of No. 4 becomes relatively slow.

The manual adjustment control valve 1
Numeral 8 can be rotated from the outside of the housing 2 by a driver or the like. With this rotation operation, the manual adjustment control valve 18 moves the arrow 91,
The amount of hydraulic oil that moves back and forth in the 92 direction and flows out from the port 24 to the oil passage 22 can be adjusted. That is, the closing speed of the door 44 can be adjusted by the manual adjustment control valve 18.

Here, in the closing operation of the door 44, for example, a strong wind may hit the door 44, and the door 44 may be rapidly closed at a high speed. In such a case, it is necessary to prevent a sudden closing operation of the door 44 in order to ensure safety and the like. A configuration for suppressing the speed of the closing operation when the door 44 receives an external factor such as a strong wind will be described below.

As shown in FIG. 2, an oil passage 27 formed in the cap 10 is provided with an automatic adjustment control valve 17.
Is screwed. The automatic adjustment control valve 17 is connected to the central shaft 16J of the motor 16,
With the rotation of No. 6, it advances and retreats in the oil passage 27. In the present embodiment, the automatic adjustment control valve 17 is directly connected to the center shaft 16J, but may be connected via a gear or the like, for example. The control unit 15 outputs a signal based on the rotation speed of the main shaft 12 fetched from the encoder 14 and controls the forward / reverse rotation of the motor 16. Note that the automatic adjustment control valve 17, the motor 16, and the like are flow rate adjusting means in the present embodiment.

Since the cap 10 is screwed into the housing 2, the communication between the oil passage 21 in the cap 10 and the port 24 formed in the housing 2 is ensured. A groove 20 is formed over the entire inner surface. This groove 20 communicates with a port 24 formed in the housing 2.

That is, since the groove 20 is formed over the entire inner surface of the housing 2, the cap 10
Even if the oil passage 21 is stopped in any direction due to the influence of the tightening, the oil passage 21 and the port 24 communicate with each other via the groove 20. A packing 19 is attached to the cap 10 to ensure that the working fluid is sealed in the cylinder 3.

FIG. 3A shows an automatic adjustment control valve 1.
7 shows an enlarged view of the vicinity of the front end. An orifice 17G is formed at the tip of the automatic adjustment control valve 17. The inner diameter L <b> 2 of the oil passage 27 is formed to have substantially the same length as the diameter of the tip of the automatic adjustment control valve 17.
The inner diameter L <b> 3 is formed slightly larger than the diameter of the automatic adjustment control valve 17 near the portion where the oil passage 27 communicates with the oil passage 21. In addition, FIG.
It is the figure which looked at the automatic adjustment control valve 17 from the front-end | tip direction.

That is, in the state shown in FIG. 3, the hydraulic oil from the oil passage 27 flows out to the oil passage 21 through the orifice 17G. A valve screw 17X is formed on the automatic adjustment control valve 17, and is screwed into a cap screw 10X formed on the housing 2.

When the automatic adjustment control valve 17 moves in response to the rotation of the motor 16 and moves, for example, in the direction of arrow 92 from the state shown in FIG. 3, the space area of the orifice 17G at the closed position P1 increases. And, by increasing the space area of the orifice 17G,
The flow rate of the hydraulic oil from the oil passage 27 gradually increases, and the valve is fully opened when the groove tip position P3 reaches the closing position P1.

Conversely, the automatic adjustment control valve 1
7 moves in response to the rotation of the motor 16 and moves in the direction of arrow 91, the orifice 17G at the closed position P1
Has a smaller space area. Then, as the space area of the orifice 17G decreases, the flow rate of the hydraulic oil from the oil passage 27 gradually decreases, and when the groove end position P2 reaches the closed position P1, the valve is completely closed, and the oil passage is closed. 27
From the oil passage 21 is completely prevented from flowing out.

As described above, by moving and adjusting the automatic adjustment control valve 17, the oil passage 27 is moved from the oil passage 21 to the oil passage 21.
It is possible to adjust the flow rate of the hydraulic oil flowing toward, and control the movement of the piston 4 in the direction of the arrow 92, that is, the speed of the closing operation of the door 44 (FIG. 10). In addition,
The groove 20, the port 24, the oil path 22, the port 23, and the piston internal space 4K from the oil paths 27 and 21 are the flow paths in the present embodiment. In addition, the motor 16, the automatic adjustment control valve 17, the cylinder 3, the piston 4, the hydraulic oil, the ball 7, and the like are the speed adjustment mechanism in the present embodiment.

FIG. 4 shows a hardware configuration diagram of a main part of the control unit 15. CPU 31 and ROM are connected to bus line 30
32 and a RAM 33 are connected. CPU 31 is RO
Each unit is controlled according to the program stored in M32. Further, the bus line 30 has an input port 3
4. The output port 35 is connected. The CPU 31
The data from the encoder 14 is taken in via the input port 34. Further, the CPU 31 outputs a signal to the motor 16 via the output port 35.

FIG. 5 shows a flowchart of the program stored in the ROM 32. The control of the door closing operation in the present embodiment will be described with reference to this flowchart. Assume now that the door closer is in the state shown in FIG. FIG. 6 shows a state in which the door 44 is opened by 75 degrees, and the piston 4 is moving in the direction of the arrow 92. It is assumed that no external factors such as strong wind are applied to the door 44 and the door is closed in a normal state.

First, the CPU 31 takes in the current rotational speed V of the main shaft 12 from the encoder 14 via the input port 34 (step S2). Next, preset in the RAM 33,
The stored reference rotation speed Vref is read and compared with the current rotation speed V detected by the encoder 14 to determine whether or not the current rotation speed V is higher than the reference rotation speed Vref (step S4). As the reference rotation speed Vref, a rotation speed of the main shaft 12 in a normal state in which an external factor such as a strong wind is not applied to the door 44 is set.

In this case, since no external factor such as strong wind is applied to the door 44, the current rotational speed V is equal to the reference rotational speed Vref, and the steps S4 to S4 are performed.
Return to 2. Normally, as shown in FIG. 6, the automatic adjustment control valve 17 is retracted in the direction of the arrow 92, and the valve is fully opened.

For this reason, the hydraulic oil from the oil passage 27 flows out to the oil passage 21 without restriction. Then, the flow rate of the hydraulic oil is suppressed by the manual adjustment control valve 18 as described above, and the piston 4 moves in the direction of the arrow 92 at a relatively slow speed due to the pressure of the hydraulic oil.

Thus, the door 44 (FIG. 10) is gradually closed, and FIG. 7 shows a completely closed state. With the door 44 completely closed, the main shaft 12 rotates by about 15 degrees and stops. As a result, a sufficient load can be applied in the closing direction of the door 44, and the door 44 can be completely closed.

Next, control when an external factor such as a strong wind is applied to the door 44 will be described. As shown in FIG. 8, it is assumed that the piston 4 is moving in the direction of the arrow 92, and an external factor such as strong wind is applied to the door 44. As described above,
The CPU 31 shown in FIG. 4 first takes in the current rotational speed V of the main shaft 12 from the encoder 14 through the input port 34 (Step S2).

Next, the CPU 31 compares the reference rotation speed Vref stored in the RAM 33 with the current rotation speed V (step S4). Since the door 44 is now affected by strong winds or the like, the current rotational speed V of the main shaft 12 is faster than the reference rotational speed Vref, and the process proceeds from step S4 to S6. Then, the CPU 31 outputs a signal to the motor 16 through the output port 35, and rotates the motor 16 by a predetermined angle so as to proceed in a direction in which the automatic adjustment control valve 17 closes (the direction of the arrow 91).

As described above, when the automatic adjustment control valve 17 advances in the direction of arrow 91, the flow rate of the hydraulic oil flowing from the oil passage 27 to the oil passage 21 is suppressed (see FIG. 3). As a result, the pressure of the hydraulic oil on the piston 4 increases, and the movement of the piston 4 in the direction of arrow 92 is suppressed, so that the closing speed of the door 44 is limited. The CPU 31 repeats such processing, and gives a signal to the motor 16 in step S6 until the reference rotation speed Vref becomes equal to the current rotation speed V. As described above, the door 44 is subjected to the feedback control, and closes at a constant speed even when receiving an external factor such as a strong wind.

In step S6, a signal can be given to the motor 16 so that the automatic adjustment control valve 17 advances in the direction of the arrow 91 by a movement amount corresponding to the difference between the reference rotation speed Vref and the current rotation speed V. That is, the necessary rotation angle of the motor 16 is calculated based on the difference between the reference rotation speed Vref and the current rotation speed V, and the motor 16
Output the signal. Thereby, one step S6
By the above processing, a substantially proper closing speed of the door 44 can be obtained.

[Second Embodiment] Next, as a second embodiment, a door closer shown in FIG. 9 will be described. This door closer differs from the first embodiment in that the manual adjustment control valve 18 is not provided in the oil passage 22.
For this reason, the number of parts can be reduced and the cost of the door closer can be reduced. In addition, a sealing member 51 is attached to the end of the oil passage 22 to prevent leakage of hydraulic oil.

In this embodiment, since the manual adjustment control valve 18 is not provided, the closing speed of the door 44 cannot be manually adjusted to an appropriate speed. Therefore, the closing speed of the door 44 is automatically adjusted by the control valve 1.
7 only. That is, the CPU 31 in the control section 15 takes in the current rotational speed V of the main shaft 12 from the encoder 14 and this current rotational speed V
If it is determined that it is later than ref, an output signal is given to the motor 16 to move the automatic adjustment control valve 17 in the direction of arrow 92.

As a result, the amount of hydraulic oil flowing from the oil passage 27 to the oil passage 21 increases, and the pressure of the hydraulic oil on the piston 4 decreases, so that the piston 4 moves in the direction of the arrow 92 at a relatively high speed. As a result, the closing operation of the door 44 can be promoted to obtain an appropriate closing speed. In addition,
When the current rotation speed V of the main shaft 12 is higher than the reference rotation speed Vref, the closing speed of the door 44 is suppressed as in the first embodiment.

[Other Embodiments] In each of the above embodiments, the embodiment in which the piston 4 moves with the rotation of the main shaft 12 has been described. However, other configurations are used as long as the piston moves with the opening and closing of the door. You may. Further, by detecting the current rotational speed V of the main shaft 12, the door 4
Although the closing speed of 4 was grasped, the present invention is not limited to this, and other means may be adopted as long as the closing speed of the door can be accurately detected.

Further, the motor 16, the automatic adjustment control valve 17, the cylinder section 3, the piston 4, the hydraulic oil, the ball 7 and the like are exemplified as the speed adjusting mechanism, but any other mechanism capable of adjusting the closing speed of the door can be used. A configuration can also be employed. Further, although the encoder 14 is used as current speed detecting means for detecting the current closing speed of the door 44 and the current rotational speed of the main shaft 12, other configurations may be adopted as long as these speeds can be accurately detected. Can also.

In addition, the shapes and structures of the cylinder portion 3, the piston 4, and the like are not limited to the above embodiments.

[Brief description of the drawings]

FIG. 1 is an external front view of a door closer to which a first embodiment of the present invention is applied.

FIG. 2 is a plan sectional view of the door closer shown in FIG.

FIG. 3A is an enlarged view of the vicinity of the automatic adjustment control valve shown in FIG. 1, and FIG. 3B is a view of the automatic adjustment control valve viewed from the front end direction.

FIG. 4 is a diagram showing a hardware configuration of a main part of a control unit shown in FIG.

FIG. 5 is a flowchart of a program stored in a ROM shown in FIG. 7;

FIG. 6 is an operating state (part 1) of the door closer shown in FIG. 2;
FIG.

FIG. 7 is an operating state (part 2) of the door closer shown in FIG. 2;
FIG.

FIG. 8 is an operating state (part 3) of the door closer shown in FIG. 2;
FIG.

FIG. 9 is a plan sectional view of a door closer to which a second embodiment of the present invention is applied.

FIG. 10 is an external front view of a door closer attached to a door.

FIG. 11 is a plan sectional view showing a conventional door closer.

12 is a sectional plan view showing an operation state (No. 1) of the door closer shown in FIG.

13 is a plan sectional view showing an operation state (part 2) of the door closer shown in FIG.

[Explanation of symbols]

 3 ····· Cylinder section 3a ······ 1st cylinder section 3b ······ 2nd cylinder section 4 ····· Piston 12 ···· Main spindle 14 ····· Encoder 15 ······ Control unit 16 ······ Motor 17 ······ Automatic adjustment control valve

Claims (4)

(57) [Claims] 1. A speed adjusting mechanism for adjusting a closing speed of a door, a current speed detecting means for detecting a current closing speed of a door, and a control means for controlling the speed adjusting mechanism based on the current closing speed. A speed adjusting device for a door closer. A main shaft rotating in accordance with an opening and closing operation of the door; a speed adjusting mechanism for adjusting a closing speed of the door; a current speed detecting means for detecting a current rotational speed of the main shaft; A speed adjusting device for a door closer, comprising: control means for controlling a speed adjusting mechanism. 3. A main shaft rotating in response to an opening and closing operation of a door, a piston movably positioned in a cylinder filled with hydraulic fluid, and separating the inside of the cylinder into a first chamber and a second chamber, the main shaft comprising: A piston that moves with rotation of the cylinder, a flow path that allows the hydraulic fluid in the first chamber and the hydraulic fluid in the second chamber to communicate with each other, and by adjusting the flow rate of the hydraulic fluid flowing in the flow path, Flow rate adjusting means for changing pressure; current speed detecting means for detecting a current rotational speed of the main shaft; control means for controlling the flow rate adjusting means based on the current rotational speed to adjust a closing speed of a door. A speed adjusting device for a door closer. 4. A piston , which is movably located in a cylinder filled with hydraulic fluid and separates the inside of the cylinder into a first chamber and a second chamber, wherein the piston moves with opening and closing of a door. A flow path for communicating the working fluid in the room and the working fluid in the second chamber, wherein the flow rate of the working fluid flowing in the flow path is adjusted based on the detected current closing speed of the door. And changing the pressure of the hydraulic fluid with respect to the piston to adjust the closing speed of the door.