JPH10184180A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop a door at an arbitrary position in an opening process, and properly close the door in a closing process. SOLUTION: A valve 82 is energized toward an X1 direction with a spring 88, and a projection 86 is formed on the valve 82. In addition, the projection 86 is formed to be capable of protruding in a high pressure chamber 50. When the edge 46a of a piston 46 is not in contact with the projection 86, or when a door is wide open, a releasing valve 90 closes for preventing the outflow of oil from the high pressure chamber 50. On the other hand, when the piston 46 comes in contact with the projection 86, or when the door is closed, the releasing valve 90 opens and oil flows out from the high pressure chamber 50 via a hole 62. According to this construction, the oil of the high pressure chamber 50 flows out through the releasing valve 90, even when the oil pressure of the high pressure chamber 50 drops at the time of closing the door and a stop valve 78 consequently closes. As a result, the door can be completely closed without stopping in a closing process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door closer, and more particularly to a door closer that can stop a door at an arbitrary position.

[0002]

2. Description of the Related Art A door closer capable of stopping a door at an arbitrary position has been proposed (Japanese Utility Model Laid-Open No. 3-331).
No. 74). FIG. 12 shows a part of the configuration of such a conventional door closer 2. The cylinder 4 of the door closer 2 is filled with oil. The piston 6 and a door (not shown) are configured to move in conjunction with each other. Piston 6
Is biased rightward (X2 direction) by a return spring (not shown).

[0003] When the door is opened, it interlocks with the movement of the door,
The piston 6 moves to the left (X1 direction) against the urging force of the return spring. At this time, the oil flows rightward from the low pressure chamber (not shown) via the oil passage 8 and the check valve 10 and flows into the high pressure chamber 12.

When the hand is released from the door, the piston 6 attempts to return to the right due to the urging force of the return spring, but the oil in the high-pressure chamber 12 flows through the oil passage 8 by the action of the check valve 10. There is no going back. Also, the steel valve 14
Since the solenoid 16 and the valve spring 18 are closed with a predetermined strength, the oil in the high-pressure chamber 12 does not flow out through the steel valve 14. Therefore, the piston 6 stops at this position. Therefore, the door linked to the piston 6 also stops at the position where the hand is released.

In order to close the door from the stopped state, the door may be slightly pushed in the closing direction. As a result, a rightward force is applied to the piston 6. Due to the resultant force of this force and the urging force of the return spring, the pressure in the high-pressure chamber 12 increases, and the steel valve 14 opens. The high pressure chamber 1 is opened via the open steel valve 14.
2 oil spills. The spilled oil is
0, 22, return to the low pressure chamber via a speed control valve (not shown). As a result, the piston 6 moves rightward at a predetermined speed.

When the piston 6 moves to the right, the oil in the high-pressure chamber 12 pushed by the piston 6 further flows out of the opened steel valve 14. Thus, once the steel valve 14 is opened, the oil in the high-pressure chamber 12 continues to flow through the opened steel valve 14. Therefore, the piston 6 continues to move rightward. Thus, even if the door is slightly pushed in the closing direction and then the hand is released, the door linked to the piston 6 continues to move in the closing direction. That is, the door can be completely closed by only slightly pushing the door in the closing direction.

[0007]

However, the conventional door closer 2 has the following problems. Immediately before the door is completely closed, the biasing force of the return spring acting on the piston 6 is not so strong because the piston 6 has moved considerably to the right. In addition, just before the door closes, resistance due to the latch of the door,
The movement of the door, i.e., the piston 6 due to the deformation resistance of the airtight cushion material provided between the door and the door frame, etc.
Movement is hindered. For this reason, the pressure in the high-pressure chamber 12 decreases, and the steel valve 14 may be closed before the door closes. This does not ensure that the door is closed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a door closer which can stop a door at an arbitrary position when opening and can surely close the door when closing. Aim.

[0009]

According to a first aspect of the present invention, there is provided a door closer which moves in a first direction in a housing in conjunction with movement of a working fluid filled in the housing in the opening direction of the door and closes the door. A moving body that moves the inside of the housing in the second direction in conjunction with the movement in the direction, moves the working fluid in the housing by the movement, and a biasing unit that urges the moving body in the second direction. A door closer that controls a moving speed of a door by a flow resistance of a working fluid with respect to the movement of the moving body, wherein the moving body is moved in a second direction with respect to the moving body when the moving body is located on a first direction side from a predetermined reference position. When the predetermined initial external force is not applied, the moving body is prevented from moving in the second direction,
When the moving body is applied with the initial external force, the moving body is allowed to move in the second direction, and when the moving body is in the second direction from the reference position, the initial moving force is applied. Closing movement control means for allowing the moving body to move in the second direction regardless of the presence or absence of the moving body.

In the door closer according to the present invention, the working fluid filled in the housing moves in the first direction in the housing in conjunction with the movement of the door in the opening direction, and the door closer moves in the closing direction of the door. A moving body that moves the working fluid in the housing by the movement, and a biasing unit that urges the moving body in the second direction. In the door closer that controls the moving speed of the door by the flow resistance of the working fluid with respect to the space, the space whose volume is reduced by the movement of the moving body in the first direction in the space filled with the working fluid in the housing is defined as a first space. The space in which the volume is reduced by the movement of the moving body in the second direction is defined as a second space.
Check valve means for allowing the working fluid in the first space to flow to the second space and preventing the working fluid in the second space from flowing to the first space; When the pressure is less than a predetermined value, the flow of the working fluid in the second space to the first space is prevented, and when the fluid pressure in the second space exceeds the predetermined value, the flow of the working fluid in the second space to the first space is permitted. First valve means,
When the moving body is on the first direction side from the predetermined reference position, the flow of the working fluid in the second space to the first space is prevented, and when the moving body is on the second direction side from the reference position. A second valve means for allowing the working fluid in the second space to flow to the first space, and the check valve means, the first valve means, and the second valve means are arranged in parallel. And

According to a third aspect of the present invention, in the door closer according to any one of the first and second aspects, the reference position is adjustable.

[0012]

The door closer of claim 1 is
If the predetermined initial external force in the second direction is not applied to the moving body when the moving body is located on the first direction side from the predetermined reference position, the moving body is prevented from moving in the second direction. When the initial external force is applied to the moving body, the moving body is allowed to move in the second direction, and when the moving body is located on the second direction side from the reference position,
Closing movement control means is provided which allows movement of the moving body in the second direction regardless of whether or not an initial external force is applied.

Therefore, when the door is opened to some extent, the opened door can be stopped at an arbitrary position,
If the door is slightly pushed in the closing direction, the stop is released and the door closes. In a state where the door is closed to some extent, the door is closed without stopping irrespective of the presence or absence of a closing operation by a person. For this reason, the door can be reliably closed to the end. Further, even when the opening amount of the door is small, the door can be closed securely. That is, the door can be stopped at an arbitrary position when the door is opened, and the door can be securely closed when the door is closed.

According to a second aspect of the present invention, there is provided a door closer, wherein the check valve means, the first valve means, and the movable body are moved from a predetermined reference position to a first position.
When the moving body is in the second direction from the reference position, the first space of the working fluid in the second space is blocked when the moving body is in the second direction from the reference position. And a second valve means for allowing the flow to the valve, and these three valve means are arranged in parallel.

Therefore, the door can be opened by allowing the flow of the working fluid in the first space to the second space by the check valve means. Also, the check valve means prevents the working fluid in the second space from flowing into the first space, and the first valve means prevents the working fluid in the second space from flowing when the fluid pressure in the second space is lower than a predetermined value. Preventing the flow of the working fluid from the second space to the first space by the second valve means when the moving body is on the first direction side from a predetermined reference position; Thus, the opened door can be stopped at an arbitrary position. Further, when the fluid pressure in the second space exceeds a predetermined value by the first valve means, the working fluid in the second space is allowed to flow to the first space, so that the stop is released by slightly pushing the door in the closing direction. Being able to close the door.

Further, when the moving body is located in the second direction from the reference position by the second valve means, the working fluid in the second space is allowed to flow to the first space, thereby allowing the second space to move. The door can be reliably closed to the end regardless of the magnitude of the fluid pressure.

That is, by using a simple configuration in which three valve means are arranged in parallel, the door can be stopped at an arbitrary position when opened, and the door can be securely closed when closed. A possible door closer can be realized.

According to a third aspect of the present invention, the door closer is configured to be able to adjust a reference position. Therefore, the door can be more reliably closed by adjusting the reference position in accordance with the secular change of the urging force of the urging means and the variation in resistance caused by the latch or the like generated when the door is closed. Further, it is possible to adjust the limit of the degree of opening in which the opened door can be stopped in accordance with the use of the door and the use environment. For this reason, the door can be closed more safely and reliably.

[0019]

FIG. 1 is a plan view showing the appearance of a door closer 30 with a stop function according to an embodiment of the present invention. The door closer 30 includes a housing 3 as a housing.
2 is provided. The housing 32 is attached to the door 24. The door 24 is supported rotatably about a hinge 28 with respect to a door frame 26 fixed to a house or the like. The pinion shaft 40 protruding from the housing 32 has
An arm 34 is attached. The arm 34 is attached to the door frame 26 via a link 36 and a bracket 38.

When the door 24 is opened (the door 24 is rotated in the direction R1 around the hinge 28), the pinion shaft 40
Rotate in the direction. Conversely, when the door 24 is closed (the door 24 is rotated in the R2 direction around the hinge 28), the pinion shaft 40 rotates in the R1 direction.

FIG. 2 shows a horizontal section of a main part of the door closer 30 of FIG. FIG. 3A is a right side view of a main part of the door closer 30. FIG. 3B shows a cross section S in FIG. 3A.
1-S1 is shown.

The inner surface 32a of the housing 32 shown in FIG. 2 is formed in a substantially cylindrical shape, and both ends of the housing 32 are closed in a liquid-tight manner by end plugs 42 and 44. The inside of the housing 32 is filled with oil as a working fluid. A piston 46 that is a moving body is disposed inside the housing 32.

In the drawing, a space on the left side (X1 direction) of the piston 46 is a low-pressure chamber 48 as a first space. A space on the right side (X2 direction) of the piston 46 is a high-pressure chamber 50 as a second space. The volume of the low-pressure chamber 48 is
6 decreases in the X1 direction (first direction). On the other hand, the volume of the high-pressure chamber 50 decreases when the piston 46 moves in the X2 direction (second direction).

A pinion gear 40a mounted on the pinion shaft 40 meshes with a rack 46b formed on the piston 46. When the pinion shaft 40 rotates in the direction R2, the piston 46 moves in the direction X1. Conversely, when the pinion shaft 40 rotates in the R1 direction, the piston 46 moves in the X2 direction. That is, the piston 46 moves in the X1 direction in conjunction with the movement of the door 24 (see FIG. 1) in the opening direction, and the piston 46 moves in the X2 direction in conjunction with the movement of the door 24 (see FIG. 1) in the closing direction. Go to

In the low-pressure chamber 48, a coil spring 52 as an urging means is disposed. The piston 46 is urged by the coil spring 52 in the X2 direction.

A check valve 58, which is a check valve means, is provided on the high pressure chamber 50 side of the piston 46. The check valve 58 allows the oil in the low pressure chamber 48 to flow to the high pressure chamber 50 and prevents the oil in the high pressure chamber 50 from flowing back to the low pressure chamber 48.

FIG. 4 is an enlarged view of the vicinity of the high-pressure chamber 50 shown in FIG. As shown in FIG. 4, the check valve 58 includes a spherical valve element 58b. Due to the pressure difference between the pressure in the low pressure chamber 48 and the pressure in the high pressure chamber 50, the oil passage 58a is closed or opened by the valve body 58b.

As shown in FIG. 4, a hole 6 is formed in the end plug 44 so as to penetrate in the thrust direction (X1, X2 directions).
0 is provided. The substantially cylindrical valve element 7 is provided in the hole 60.
4 and a spring 76 are fitted and sealed by a lid 80 provided with a thread groove. The valve element 74 is urged by a spring 76 in the X1 direction. An elastic body (for example, urethane rubber) 72 is fitted into the end of the valve body 74 in the X1 direction.

From the X1 direction end side of the hole 60, the O-ring 7
The valve seat 68 fitted with a 0 is fitted. The valve seat 68 is provided with a hole 68a so that oil can flow out from the hole 68a.

When the pressure (fluid pressure) of the high-pressure chamber 50 is equal to or lower than a predetermined value, the force of the spring 76 pressing the valve body 74 in the X1 direction is superior, and the hole 68a of the valve seat 68 is provided in the valve body 74. It is closed by the elastic body 72. Conversely, when the pressure in the high-pressure chamber 50 exceeds a predetermined value, the force of the oil in the high-pressure chamber 50 pushing the valve body 74 in the X2 direction through the hole 68a of the valve seat 68 causes the spring 76 to move the valve body 74 to X1. Superior to the pushing force in the direction
4 retreats in the X2 direction (see FIG. 5).

The valve body 74, the spring 76, the elastic body 72,
The O-ring 70 and the valve seat 68 constitute a stop valve 78 as first valve means.

The end plug 44 has a thrust direction (X
Another hole 62 is provided so as to penetrate in the (X1, X2 direction). A substantially cylindrical valve element 82 and a spring 88 are fitted into the hole 62, and a cover 92 having a thread groove is provided.
Sealed. The valve element 82 is urged in the X1 direction by a spring 88.

A projection 86 is formed at the end of the valve body 82 in the X1 direction. The projection 86 is provided with a hole 44b provided on the end surface 44a on the X1 direction side of the end plug 44.
Through the high pressure chamber 50. An O-ring 84 is attached to the base of the projection 86 of the valve element 82.

When the end surface 46a of the piston 46 in the X2 direction is located on the X1 side of a predetermined reference position, that is, the end surface 46a of the piston 46 is
When the valve body 82 is not in contact with the distal end 86a of the valve body 82, the valve body 82 is pushed in the X1 direction by the spring 88. Therefore, the O-ring 84 is pressed against the bottom surface 62 a of the hole 62 on the X1 direction side, and prevents the oil in the high-pressure chamber 50 from flowing out through the hole 62.

On the other hand, when the end surface 46a of the piston 46 is on the X2 direction side from the predetermined reference position, that is, when the end surface 46a of the piston 46 is
6a, the valve element 82 is connected to the spring 8
8 is pushed in the X2 direction against the urging force. Therefore,
The close contact between the O-ring 84 and the bottom surface 62a of the hole 62 is released (see FIG. 6), and the oil in the high-pressure chamber 50 flows out through the hole 62.

The valve body 82, projection 86, spring 88, O
The ring 84 constitutes a release valve 90 which is a second valve means. The above-described check valve 58, stop valve 78 and release valve 90 correspond to the closing movement control means.

The end plug 44 has a radial direction (X
1, a direction perpendicular to the X2 direction).
4 are provided. The hole 64 is provided so as to intersect with the holes 60 and 62 described above. Therefore, the oil that has flowed out of the high-pressure chamber 50 via the above-described stop valve 78 and release valve 90 passes through the hole 64 and a speed adjusting valve 94 (see FIG. 3B) described later, and enters the low-pressure chamber 48 (see FIG. 1). Return.

It should be noted that, as shown in FIG.
An O-ring 66 is fitted around the outer periphery of the cylinder 4 to prevent oil leakage. Further, an O-ring 54 and a backup ring 5
6 is fitted. The O-ring 54 and the backup ring 56 ensure liquid tightness with the inner surface 32a of the housing 32, thereby preventing oil leakage between the low-pressure chamber 48 and the high-pressure chamber 50.

As shown in FIG. 3B, the housing 32 is provided with a speed regulating valve 94 which is a bottleneck. As described above, any oil that has flowed out of the high-pressure chamber 50 through the stop valve 78 and the release valve 90 passes through the hole 64 through the oil passage 93, the speed adjustment valve 94, and the oil passage 98 shown in FIG.
And returns to the low-pressure chamber 48 (see FIG. 1). Therefore,
The flow rate of the oil returning from the high-pressure chamber 50 to the low-pressure chamber 48 can be kept substantially constant. That is, the closing speed of the door 24 can be maintained substantially constant. The oil flow rate can be adjusted by adjusting the speed adjusting valve 94. An O-ring 96 is attached to the outer periphery of the speed adjustment valve 94 near the end in the X2 direction to prevent oil leakage from the speed adjustment valve 94.

Next, the operation of the door closer 30 will be described with reference to FIGS. As described above, FIG.
When the door 24 shown in FIG. 2 is opened, the pinion shaft 40 rotates in the R2 direction, and accordingly, the piston 46 shown in FIG.
Moves in the X1 direction against the urging force of the coil spring 52. Thus, the oil in the low pressure chamber 48 flows to the high pressure chamber 50 via the check valve 56.

Here, when the hand is released from the door 24, the piston 46 receives a force in the X2 direction due to the urging force of the coil spring 52 and attempts to return to the X2 direction. However, due to the action of the check valve 58, the oil in the high-pressure chamber 50
(See FIG. 4), it is not possible to return to the low pressure chamber 48.

The hydraulic pressure in the high-pressure chamber 50 rises due to the urging force of the coil spring 52.
The stop valve 78 shown in FIG. 4 is set so as not to open. Therefore, the oil in the high pressure chamber 50 is supplied to the stop valve 7.
There is no return to the low pressure chamber 48 via 8.

Further, the reference position shown in FIG.
Is set corresponding to the position of the cylinder 46 immediately before closing. For this reason, when the door 24 is opened to the extent that a person can enter and exit, as shown in FIG. 4, the end surface 46a of the piston 46 is on the X1 direction side of the reference position. Therefore, the end surface 46a of the piston 46 is
2 is not in contact with the tip 86a of the projection 86, and the release valve 9
0 remains closed. Therefore, the oil in the high-pressure chamber 50 does not return to the low-pressure chamber 48 via the release valve 90.

As described above, even if the hand is released from the door 46, the oil in the high-pressure chamber 50 does not return to the low-pressure chamber 48, and therefore, the piston 46 does not return in the X2 direction. Therefore, the opened door 24 stops at that position.

Next, the opened door 24 is slightly pushed by a hand or the like in the closing direction shown in FIG. Thereby, the pinion shaft 4
0 rotates in the R1 direction, and the piston 46 shown in FIG.
Receives force (initial external force) in the direction. Thereby, the high pressure chamber 5
The oil pressure of 0 further increases. Thus, the high pressure chamber 5
When the zero pressure exceeds a predetermined value, the stop valve 78 opens.

FIG. 5 shows a state where the stop valve 78 is open. When the stop valve 78 opens, the oil in the high-pressure chamber 50
3B through the hole 68a, the hole 60, and the hole 64 of the valve seat 68.
And returns to the low-pressure chamber 48 through an oil passage 93, a speed adjusting valve 94, and an oil passage 98 shown in FIG.

Thus, as shown in FIG. 5, the piston 46 moves at a predetermined speed in the X2 direction. Piston 46
Moves in the X2 direction, the oil in the high-pressure chamber 50 pushed by the piston 46 further flows out of the opened stop valve 78. As described above, once the stop valve 78 is opened, the oil in the high-pressure chamber 50 continues to flow out through the opened stop valve 78. Therefore, the piston 46 continues to move in the X2 direction. For this reason, even if the door 24 is slightly pushed in the closing direction and then the hand is released from the door 24, the door 24 linked to the piston 46 continues to move in the closing direction.

When the piston 46 continues to move in the X2 direction in this manner, the end surface 46a of the piston 46 eventually reaches the reference position and comes into contact with the tip 86a of the projection 86 of the release valve 90. The end surface 46 a of the piston 46 is the tip 8 of the projection 86.
Upon contact with 6a, the release valve 90 opens.

FIG. 6 shows a state in which the release valve 90 is open.
When the release valve 90 is opened, the oil in the high-pressure chamber 50 is supplied to the hole 44 b and the hole 6 provided in the end face 44 a of the end plug 44.
2, through the hole 64, returns to the low pressure chamber 48 through the oil passage 93, the speed regulating valve 94, and the oil passage 98 shown in FIG. 3B.

In this manner, when the door 24 is closed, the urging force of the coil spring 52 becomes weak,
The movement of the piston 46 may be hindered by resistance or the like caused by a latch (not shown) generated when closing the high pressure chamber 5.
0, the hydraulic pressure of the stop valve 78 decreases as shown in FIG.
Even if is closed, the oil in the high-pressure chamber 50 returns to the low-pressure chamber 48 through the release valve 90. Therefore, the door 24 closes without stopping at the time of closing.

FIG. 7 shows the state of the release valve 90 when the door 24 is closed. When the door 24 is closed, the end surface 46 a of the piston 46 and the end plug 44 are closed.
Is in contact with the end surface 44a. At this time, the capacity of the high-pressure chamber 50 (see FIG. 6) is minimized, and the oil in the high-pressure chamber 50 has almost returned to the low-pressure chamber 48 (see FIG. 2).

It should be noted that the door 24 is closed from the closed state.
Is slightly opened, the release valve 90 remains open as shown in FIG. Therefore, in this case, when the user releases his / her hand from the opened door 24, the door 24 closes without stopping in that state.

FIG. 8 is a horizontal sectional view of a main part of a door closer 130 having a stop function according to another embodiment of the present invention. The door closer 130 differs from the above-described door closer 30 in that the position of the projection bar 186 as a projection is adjustable with respect to the valve body 182 of the release valve 190. Other configurations are the same as those of the door closer 30.

FIG. 9 is a right side view of a main part of the door closer 130. 10 and 11 are drawings for explaining a method of adjusting the release valve 190. As shown in FIG. 10, a female thread is cut in a valve body 182 constituting the release valve 190. On the other hand, the projection bar 186 is externally threaded, and the valve body 182 and the projection bar 186 are screwed together.

An X1-direction portion of the projection bar 186 projects into the high-pressure chamber 50. An X2 direction side portion of the projection bar 186 is provided with a hole 192 provided at the center of the lid 192.
A protrudes outward from the end plug 44 via a.
The O-ring 100 is attached to the hole 192a of the lid 192 to prevent oil in the release valve 190 from leaking.

As shown in FIG. 9, the X
A minus slot is provided in the end portion 186b on the two directions, and a minus driver is engaged with the end portion 186b, and the projection bar 186 is rotated by rotating the projection bar 186. The high pressure chamber 5 shown in FIG.
Adjust the protrusion length to zero. The position of the tip 186a of the projection bar 186 on the X1 direction side is the reference position.

FIG. 11 shows the high pressure chamber 50 of the projection bar 186.
7 shows a state in which the length of the protrusion is adjusted to be shorter. FIG.
When the adjustment is performed as shown in FIG. 1, the reference position is in the X2 direction as compared with the case of FIG. That is, when adjusted as shown in FIG. 11, the position where the door 24 can be stopped with the door 24 opened is closer to the closing direction than in the case of FIG. That is, even when the door 24 is slightly opened, the door 24 can be stopped.

As described above, by adjusting the reference position, the limit of the open / close position at which the door 24 can be stopped can be set freely.

In each of the above embodiments, the oil flowing from the high pressure chamber through the stop valve and the oil flowing out of the high pressure chamber through the release valve pass through a common bottleneck (speed control valve). The oil flowing from the high-pressure chamber through the stop valve and the oil flowing out of the high-pressure chamber through the release valve return to the low-pressure chamber through different bottlenecks. You can also.

In each of the above embodiments, the second
Is configured to include a valve body and a projection provided on the valve body, but the second valve means is not limited to this, and the movable body is moved from the predetermined reference position to the first position. When the moving body is in the second direction from the reference position, the first space of the working fluid in the second space is blocked when the moving body is in the second direction from the reference position. What is necessary is just to allow the flow to.

Further, in each of the above-described embodiments, three valve means of the check valve means, the first valve means and the second valve means are provided as the closing movement control means. As means, one or two or four or more valve means may be provided. In short, as the closing movement control means, the second movement of the moving body when the predetermined initial external force in the second direction is not applied to the moving body when the moving body is on the first direction side from the predetermined reference position. In the case where the initial external force is applied to the moving body, the moving body is allowed to move in the second direction, and the moving body is moved in the second direction from the reference position. In some cases, it is sufficient that the moving body is allowed to move in the second direction regardless of whether or not the initial external force is applied.

Further, in each of the above-described embodiments, the door closer having two spaces of the first space and the second space as the space filled with the working fluid has been described as an example.
The present invention can also be applied to a door closer having three or more spaces as a space filled with a working fluid.

In each of the above embodiments, the coil spring is used as the urging means, but the urging means is not limited to this. For example, as the urging means, a gas cylinder utilizing the repulsive force of gas, or a means utilizing magnetic force or gravity can be used.

In each of the above embodiments, oil is used as the working fluid, but the working fluid is not limited to this. For example, a liquid or semi-fluid other than oil can be used as the working fluid. Further, a gas can be used as the working fluid.

[Brief description of the drawings]

FIG. 1 is an external plan view of a door closer 30 with a stop function according to an embodiment of the present invention.

FIG. 2 is a drawing showing a horizontal section of a main part of the door closer 30 of FIG.

FIG. 3A is a right side view of a main part of the door closer 30. FIG. FIG. 3B is a drawing showing a cross section S1-S1 in FIG. 3A.

FIG. 4 is an enlarged view of the vicinity of a high-pressure chamber 50 shown in FIG.

FIG. 5 is a drawing showing a state in which a stop valve 78 is opened.

FIG. 6 is a drawing showing a state in which a release valve 90 is opened.

FIG. 7 shows the release valve 9 with the door 24 closed.
FIG.

FIG. 8 is a drawing showing a horizontal cross section of a main part of a door closer 130 having a stop function according to another embodiment of the present invention.

9 is a right side view of a main part of the door closer 130. FIG.

FIG. 10 is a drawing for explaining a method of adjusting a release valve 190.

11 is a drawing for explaining a method of adjusting a release valve 190. FIG.

FIG. 12 is a drawing showing a part of the configuration of a conventional door closer 2.

[Explanation of symbols]

 46 ··· piston 46a ··· end face of piston 50 ··· high pressure chamber 62 ··· hole 78 ··· stop valve 82 ··· valve body 86 ··· projection 88 ···・ Spring 90 ・ ・ ・ ・ ・ ・ Release valve

Claims (3)

[Claims] A working fluid filled in a housing moves in a first direction in the housing in conjunction with the movement of the door in the opening direction, and moves in the housing in a movement in the closing direction of the door. Second
And a biasing means for biasing the moving body in the second direction, wherein the moving body moves the working fluid in the housing by the movement. In a door closer for controlling a moving speed of a door, when a predetermined initial external force in a second direction is not applied to the moving body when the moving body is located in a first direction side from a predetermined reference position, The movement in the second direction is prevented, and when the initial external force is applied to the moving body, the moving body is allowed to move in the second direction, and the moving body is moved in the second direction from the reference position. If it is on the side,
A closing movement control means for allowing the moving body to move in the second direction regardless of whether or not an initial external force is applied. The working fluid filled in the housing moves in the first direction in the housing in conjunction with the movement of the door in the opening direction, and moves in the housing in the movement in the closing direction of the door. Second
And a biasing means for biasing the moving body in the second direction, wherein the moving body moves the working fluid in the housing by the movement. In a door closer for controlling a moving speed of a door, a space whose volume is reduced by movement of a moving body in a first direction in a space filled with a working fluid in a housing is defined as a first space; The space in which the volume is reduced by the movement in the direction of is defined as the second space, and the working fluid in the first space is allowed to flow to the second space,
Check valve means for preventing the flow of the working fluid in the space to the first space; when the fluid pressure in the second space is equal to or lower than a predetermined value, the flow of the working fluid in the second space to the first space is prevented; First valve means for allowing the working fluid in the second space to flow to the first space when the fluid pressure in the second space exceeds a predetermined value, and when the moving body is located on the first direction side from a predetermined reference position. A flow that prevents the flow of the working fluid in the second space to the first space and allows the flow of the working fluid in the second space to the first space when the moving body is on the second direction side from the reference position. 2. A door closer, comprising: a second valve means; and the check valve means, the first valve means, and the second valve means arranged in parallel. 3. The door closer according to claim 1, wherein said reference position is adjustable.