JPH10131602A - Automatic door closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic door closing device opening/closing a door always smoothly while being simple in structure and easy to manufacture and invisible at the time of closing the door so as to make the appearance of the door neat. SOLUTION: An automatic door closing device is composed of a link 6 fitted between a door 1 and an opening upper frame, and automatic door closing mechanism 7. In this case, the automatic door closing mechanism 7 is composed of a guide 5 provided along the lower face of the opening upper frame, a sliding body 76 moving in the guide 5, a damper member 71, a piston rod 72 slidably fitted with play into a guide pipe 73, with one end fixed to a piston of the damper member 71 and with the other end fixed to the sliding body 76, a tension spring 78 energizing the sliding body 76 in a direction of drawing it onto the damper member 71 side, and a spring member 9 acting in a direction of closing the door 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic closing device for a door, and more particularly, to a device for automatically and lightly operating the closing of a door, and for maintaining an open state of a door and performing another closing operation. The present invention relates to an automatic door closing device that can be operated only by opening and closing the door without using such a method.

[0002]

2. Description of the Related Art Conventionally, doors attached to entrances and other entrances are sometimes provided with an automatic closing device for automatically closing an open door. By the way, an automatic door closing device that has been widely used in the past is that a casing is filled with hydraulic oil, and a cylinder provided in the casing or the casing is also used as a cylinder, and the door is closed in the cylinder. A piston that moves following the opening and closing operation, and a needle valve that adjusts the flow rate of hydraulic oil between the cylinder top side and the bottom side to adjust the closing speed of the door are provided, and a casing or a cylinder is provided. And a spring for moving the piston in the direction to close the door. Then, the body of the automatic closing device of this door is attached to the door side, and the upper side of the fitting frame or Kamoi, on the fixed side such as Nakagami,
The distal end of a link that is protruded and pivotably attached to the main body is attached to the main body. The closing speed of the door is controlled by adjusting the spring pressure contained in the casing and the flow rate of the hydraulic oil by the needle valve. Furthermore, even if the flow of hydraulic oil is closed by the needle valve, a small orifice separate from the needle valve is attached to the piston or cylinder separately from the needle valve so that the door automatically closes slower than the minimum speed of speed adjustment by oil amount adjustment. It is provided so as to ensure the minimum flow rate of hydraulic oil flowing between the left and right chambers in the cylinder.

[0003]

In the conventional automatic closing device for a door, a main body composed of a casing containing a cylinder, a needle valve, a spring and the like and filled with hydraulic oil, and a protruding and protruding portion extending from the main body. Although it is composed of provided links, the device itself is extremely bulky in order to close the door by spring pressure or the like. Therefore, if this door automatic closing device is attached to the upper part of the door in an external form, it must be installed at a position that stands out well on the appearance of the door, and the appearance of the door is damaged, and the installation location of the automatic door closing device, According to the material and color tone of the door, automatic closing devices for doors of many types and colors have to be prepared, which has a problem that the cost is increased.

Further, since the inner diameter of the orifice provided separately from the flow path in which the flow rate of the hydraulic oil is adjusted by the needle valve is extremely small, 0.2 to 0.3 mm, the orifice is mixed into the hydraulic oil. It may be clogged with fine dust generated, or dust caused by wear pieces of the member generated by wear of the member during use. In addition, since the orifice is only released at the inlet / outlet of the hydraulic oil, dust that has entered the orifice is not easily discharged, and if the orifice is clogged in this way, the door cannot be reliably closed. There was a problem.

The present invention solves the problems of the above-mentioned conventional automatic closing device for doors, is simple in structure and manufacturing, can smoothly open and close the door at all times, and cannot be seen from the outside when the door is closed. An object of the present invention is to provide an automatic door closing device capable of clearing the appearance of the door.

[0006]

In order to achieve the above object, an automatic door closing device according to the present invention comprises a link provided between a door and an upper frame, the link moving following the opening and closing of the door, and a link above the opening. An automatic door closing mechanism arranged on either the lower surface of the frame or the upper end of the door, and the automatic door closing mechanism guides the lower door of the opening upper frame or the guide along the upper end of the door and the opening and closing of the door. Inside, a damper member that regulates the speed by regulating the flow rate of hydraulic oil in one direction, and a guide pipe that has one end fixed to the piston of the damper member and the other end fixed to the slide. A movably loosely fitted piston rod,
It is characterized by comprising a tension spring for urging the sliding body toward the damper member and a spring member for acting in the direction to close the door.

In the automatic door closing device according to the present invention, the link that moves following the opening and closing of the door is stored in the gap between the upper surface of the door and the upper opening frame, and regulates the swing speed of the link. An automatic door closing mechanism consisting of a damper member, etc. is located on either the lower surface of the upper opening frame or the upper end of the door, so the structure is simple and easy to install, and when the door is closed, The closing device is completely invisible from the outside, and the appearance of the door is clear.

In this case, an oil guide groove through which hydraulic oil flows through the piston of the damper member, a valve seat surface formed on the open end surface of the oil guide groove, on which a ball valve is seated, and a ball seat on the valve seat surface When the valve is seated, a small groove engraved on the valve seat surface for conducting the oil guide groove can be formed.

Thus, when the door is opened and closed, clogging due to fine dust can be naturally removed by moving the ball valve, and the manufacturing is simpler than the conventional method of perforating a fine hole. Operational reliability is improved.

Further, the automatic door closing mechanism may be provided with a stopper mechanism comprising a stopper fixed body and a movable stopper body swingably mounted on the slide body side.

Thus, the door can be kept open without using parts such as a door stop.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic door closing device according to the present invention will be described below with reference to the drawings. 1 to 6
1 shows a first embodiment of the automatic door closing device of the present invention. This automatic door closing device is configured such that one end is pivotally mounted on a door 1 which can be opened and closed via a hinge 3 on a pillar or an opening vertical frame 2 or the like, and is installed between the door 1 and the opening upper frame 4. It comprises a link 6 that moves following opening and closing, and an automatic door closing mechanism 7 provided in a guide 5 serving as a door stop provided along the lower surface of the upper opening frame 4. In the present embodiment, the spring member 9 acting in the direction to close the door 1 constituting the automatic door closing mechanism 7 is
Side.

A guide 5, which is disposed along the lower surface of the upper opening frame 4 and fixed by screws or the like, comes into contact with the upper part of the door 1 and also serves as a door stop, and has a U-shaped cross section. And has a length that reaches almost the entire length of the upper frame 4. As shown in FIG. 2 (A), on the side of this guide 5 which doubles as a door stop,
A notch 5a is formed within a predetermined range so that the link 6 does not contact the side wall of the guide 5. The guide 5 accommodates an automatic closing mechanism 7 that expands and contracts following the opening and closing operation of the door and automatically closes the door.

The automatic door closing mechanism 7 includes a damper member 71 fitted and fixed in the guide 5 having a side wall surface serving as the guide rail 51, a piston rod 72 of the damper member 71,
A guide pipe 73 into which the distal end of the piston rod 72 is inserted, a sliding body 76 having a roller 77 fixed to the distal end of the guide pipe 73 with a pin 74, and a tension member extending between the piston rod 72 and the guide pipe 73. And sliding body 7
The tension spring 78 urges the piston rod 72 toward the damper member 71, i.e., pulls the piston rod 72 into the guide pipe 73.

As shown in detail in FIG. 3, the damper member 71 has a cylinder 71S having a required diameter that fits in the guide 5 and a length necessary for opening and closing the door 1, and a sealing degree is increased at the outer peripheral portion. Piston 71 provided with sealing material such as V packing
P is slidably inserted, and a rod cover 71K provided with a seal material is fixed to an end of the cylinder 71S by a screw or the like so that hydraulic oil does not leak from the inside of the cylinder 71S.

The piston 71P has a piston rod 72
The right side (top side chamber) R2 is fixed inside the cylinder 71S filled with hydraulic oil by the piston 71P while the base end side of the right side is fixed.
And a left chamber (bottom side chamber) R1. A ball valve fitting groove 71M is formed on the other end side. A ball valve 71B is fitted into the ball valve fitting groove 71M, and a piston 71P is formed. From the outer peripheral surface of the ball valve fitting groove 71M
Oil guide groove 71N is formed so as to be electrically connected to the oil guide groove 7N.
A ball valve 71 is provided on a valve seat surface 70O formed on the 1N opening surface.
A spring S is provided to urge B to be seated. Also,
When the ball valve 71B is seated on the valve seat surface 71O, a small groove 71L is engraved on the valve seat surface 71O so as to conduct the oil guide groove 71N.
Even if the seat is seated on the valve seat surface 71O with the biasing force of
Hydraulic oil is supplied to the right chamber R2 of the cylinder 71S little by little through L.
To the left ventricle R1. Thus, the movement of the hydraulic oil filled in the cylinder 71S is controlled by the ball valve 71B.
And the small groove 71L to restrict the moving speed of the piston 71P.

Since the oil guiding small groove 71L is formed on the valve seat surface 71O which is in contact with or faces the ball valve 71B over the entire length thereof, even if dust enters the small groove 71L, Each time the door 1 is opened or closed, the ball valve 71
By the movement of B, the dust is naturally cleaned, and the dust that has entered the small groove 71L is also discharged.

The guide pipe 73 has a piston rod 72 slidably fitted to the base end thereof, and a sliding body 76 fixed to the distal end of the guide pipe 73 by a pin 74. Further, a pin P1 is locked in the vicinity of the distal end side of the guide pipe 73, and the pin P1 and the piston rod 7 at a position where sliding is not hindered.
2 and a pin P2 protruding in the vicinity of the base end side of the tension spring 7
8 so that the sliding body 76 is always urged toward the damper member 71, that is, in a direction in which the piston rod 72 is drawn into the guide pipe 73. The tension spring 78 can be formed in a coil shape and inserted into the outer periphery of the guide pipe 73 to reduce the bulk. The tensile force of the tension spring 78 is configured to be selectable and replaceable according to the weight of the door 1 and the like, so that it can be applied to various doors 1. In this embodiment, the distal end of the piston rod 72 is inserted into the guide pipe 73. However, the piston rod 72 is formed of a pipe member, and the guide pipe 73 is inserted into the distal end of the piston rod 72. It can also be configured by inserting.

A roller 7 is mounted on a sliding body 76 fixed to the end of the guide pipe 73 so as to protrude from the side surface of the sliding body 76.
7 is rotatably supported, and the sliding member 76 is smoothly moved along the longitudinal direction of the guide 5 while the roller 77 of the sliding member 76 is in contact with the inner surface of the guide rail 51 of the guide 5.

One end of this roller shaft 79 is projected from the sliding body 76 on the sliding body 76 supporting the roller 77,
One end of the link 6 is pivotally supported by the roller shaft 79, and the guide pipe 73, the piston rod 72, and the damper member 71 are driven via the link 6 which swings by opening and closing the door 1.

In order to hold the door 1 open, a stopper mechanism 8 is provided in the guide 5. As shown in detail in FIG. 4, the stopper mechanism 8 is fixed to a stopper movable body 81 protruding from a distal end of a sliding body 76 and to a guide 5 for locking or unlocking the stopper movable body 81. And a stopper fixing body 82 to be formed. The stopper movable body 81 has a stopper piece 81H protruding at a distal end portion, and a base end side of the stopper movable body 81 is supported by a sliding body 76 so as to be swingable about a shaft 84, and a spring 83 is attached to an outer periphery of the shaft 84. The biasing force of the spring 83 allows the movable stopper 81 to swing in the arrow direction shown in FIG.

A stopper fixing body 82 which is disposed opposite to the stopper movable body 81 and locks or unlocks the stopper piece 81H following the opening / closing operation of the door is fitted into the guide 5 to fit. The stopper fixing body 82 forms a deformed M-shaped groove 82M with a height difference for guiding the stopper piece 81H to a surface facing the stopper piece 81H. The stopper piece 81H of the stopper movable body 81 protruding from the sliding body 76 that moves in the guide 5 according to the opening angle of the door 1 swings left and right according to the groove shape when moving by being guided by the groove 82M. The groove 82M swings up and down due to the height difference. Then, at a predetermined opening angle of the door 1, the door 1 holds the locked state by the action of the stopper mechanism 8, and then when the door 1 is opened again beyond this set angle, the stopper piece 81H is guided to the groove 82M. The door 1 moves again to be disengaged from the locking of the groove 82M, and the door 1 operates in the closing direction.

Next, a description will be given of a groove 82M provided with a height difference for guiding the stopper piece 81H. As shown in detail in FIG. 4A, when the door 1 is opened, the sliding body 76 moves via the link 6 according to the opening of the door 1. This sliding body 76
, The stopper piece 81H of the stopper movable body 81 approaching the groove 82M is smoothly guided to the entrance a of the groove 82M. The groove 82M has a width of the stopper piece 81H,
The width and depth are determined so as to match the protruding height, and are provided at the relative positions of the stopper pieces 81H that move inside the guide 5. Then, a groove 82 is formed through
The inclined portion b is formed so that the depth of M gradually becomes shallower.
Thereby, the stopper piece 81H is further increased depending on the opening degree of the door 1.
4A, the stopper piece 81H is pushed up in the direction of the arrow in FIG. 4B by the inclined portion b, and the stopper movable body swings upward against the spring 83. When the door 1 is opened to the fixed position angle, the stopper piece 81H is attached to the lower bottom c of the groove 82M by the spring 83.
The door 1 is closed by the urging force of the tension 78 of the automatic door closing mechanism 7 while the door is prevented from being further opened. In accordance with the movement of the door 1 in the closing direction, the stopper piece 81H falls into a lower engaging lower bottom portion d formed so as to have a step from the innermost lower bottom portion c of the groove 82M. This low bottom d for locking
The door 1 is held in an open state by fitting and holding the stopper piece 81H on the door 1. Next, when the door 1 is closed from the open and held state, if the door 1 is further swung in the opening direction once, the stopper movable body 81 also moves via the link 6 and the sliding body 76 following the swing. . As a result, the stopper piece 81H also moves from the locking lower bottom portion d,
Since the lower bottom portion c adjacent thereto is at a high position, the stopper piece 81H is prevented from moving in the direction of the lower bottom portion c, and moves in the direction of the lowest bottom portion e adjacent to the other side. The bottom surface of the lowest bottom portion e gradually increases, and the return guide groove portion f is inclined so as to continue to the bottom surface position of the entrance portion a.
Is provided, the stopper piece 81H moves along the return guide groove f to unlock the door 1 in the open state.

The structure of the stopper mechanism is not limited to that of the present embodiment, but has a similar function, that is, a so-called push catch (locked when the door is opened, and unlocked when the door is further opened from the locked state). A mechanism referred to as a “mechanism” can be applied.

The spring member 9 provided on the support shaft of the link 6 on the door 1 acting in the closing direction of the door 1 is provided in a main body case 90 provided to be embedded in the upper surface of the door 1 as shown in FIG. A torsion spring 91 is disposed at the upper end of the torsion spring 91, and a turning member 92 is locked at the upper end of the torsion spring 91.
The lower end of the first member 1 is locked to a bottom member 95 fixedly adjustable by a locking pin 91. A rectangular shaft 93 is formed at the upper end of the rotating member 92, and the link 6 is fitted to the rectangular shaft 93, so that when the link 3 swings by opening and closing the door 1, the rectangular shaft 93 fitted to the link 3 is formed. The rotating member 92 is simultaneously rotated via 93, and the torsion spring 91 stores the urging force for urging the door 1 through the link 6 in the closing direction. When the door 1 is closed, the spring member 9 is provided on the upper surface of the door 1 by setting the urging force for urging the torsion spring 91 in the closing direction of the door 1 via the link 6 to the torsion spring 91. To In addition, a protrusion 92a that is inserted into a notch 90a formed in the main body case 90 is formed on the rotating member 92 so that the rotation angle of the rotation member 92, that is, the swing angle of the door 1, can be regulated. A screw hole 90 for fixing the main body case 90 to the door 1 is provided in the main body case 90.
b is formed.

When the main body case 90 is formed in a cylindrical shape like the spring member 9 shown in FIG.
0b are formed at two places.

In this embodiment, the spring member 9 is connected to the shaft 6 of the link 6 on the door 1 side so that the shape of the guide 5 serving as a door stop provided along the lower surface of the upper opening frame 4 can be reduced. However, the position of the spring member is not limited to this, and a tension spring acting in the direction of closing the door 1 in parallel with the tension spring 78 is stretched in the guide 5 also serving as a door stop. It can also be configured. In this case, the tension spring is made up of the guide pipe 73 or the sliding body 76 and the damper member 7.
It is stretched between the fixed side near 1.

Next, the operation of the above automatic door closing device will be described. When the door 1 is opened, the link 6 swings following the opening of the door, and the sliding body 76 of the automatic closing mechanism 7 that supports the end of the link 6 is moved along the guide rail 51. When the opening speed of the door 1 is faster than the operating speed of the damper member 71, the tension spring 7
8 and the guide pipe 73 externally fitted to the piston rod 72 relatively moves against the urging force of the torsion spring 91,
As the tension spring 78 is extended, the piston rod 72 is simultaneously pulled by this force. Due to the movement of the piston rod 72, the piston 71 of the damper member 71 also slides in the cylinder 71S. When the piston 71 moves, the hydraulic oil in the cylinder 71S is moved from the left chamber R1 to the right chamber R2.
And flows through the oil guide groove 71N. Thus, even in the initial stage when the door 1 is opened faster than the operating speed of the damper member 71, the door 1 can be smoothly opened only by applying a force corresponding to the urging force of the tension spring 78 and the torsion spring 91. it can. Then, when the opening speed of the door 1 is lower than the operating speed of the damper member 71 or the door 1 is opened to a predetermined position and stopped, the piston rod 72 of the damper member 71 further moves to the predetermined position by the tension of the tension spring 78. It is pulled out and stops. The open state of the door 1 can be held by the stopper mechanism 8.

Next, in order to close the door 1, the stopper mechanism 8 is removed by swinging the door 1 once more in the opening direction, so that the urging force of the tension spring 78 can be obtained without operating the door 1 in particular. By the piston rod 72 being pulled into the guide pipe 73, the sliding body 76 is
The door 1 is closed sharply until it is drawn to the side 1 and the piston rod 72 is completely drawn into the guide pipe 73.

Further, since a force is applied to the door 1 in the closing direction by the torsion spring 91 of the spring member 9 disposed at the support shaft position of the link 6 on the door 1 side, the piston in the closing direction is acted upon by the force in the closing direction. 71P moves inside the cylinder 71S from the left chamber R1 side to the right chamber R2 side by the action of the tension spring 78.
At this time, the hydraulic oil in the cylinder 71S flows from the right chamber R2 to the left chamber R1 while the flow rate is adjusted. For this reason, the force in the closing direction by the torsion spring 91 is buffered by the damper member 71, and the swing speed of the link 6, that is,
The closing speed of the door 1 is regulated and becomes slow, and the door 1 is closed slowly.

In the automatic door closing device, only the link 6 is exposed to the outside of the door 1, and when the door 1 is completely closed, the link 6 is also shown in FIG. 2 (A). Is stored in the gap formed between the upper surface of the door 1 and the upper opening frame 4 as described above, so that the automatic closing device for the door is not visible from the outside.

Next, FIG. 7 shows a second embodiment of the automatic door closing apparatus according to the present invention. The automatic door closing device is installed between a door 1 which is provided on a pillar or an opening vertical frame 2 or the like via a hinge 3 so as to be openable and closable, and a shaft 93 formed on an opening upper frame 4, and follows the opening and closing of the door 1. The door 6 includes a link 6 that moves along with the door 1, an automatic door closing mechanism 7 provided at the upper end of the door 1, and a stopper device (not shown). In the present embodiment, a groove-shaped guide 11 having an upper surface opened at the upper end of the door 1 is formed, and the automatic door closing mechanism 7 shown in the first embodiment is fitted into the guide 11. A damper member 71 fitted and fixed in the inside, a piston rod 72 of the damper member 71,
A guide pipe 73 into which the distal end of the piston rod 72 is inserted, a sliding body 76 having a roller 77 fixed to the distal end of the guide pipe 73, and a sliding member extending between the piston rod 72 and the guide pipe 73, A tension spring 78 for urging the moving body 76 toward the damper member 71, i.e., a direction for pulling the piston rod 72 into the guide pipe 73, is provided.
One end is pivoted. In this embodiment, a stopper mechanism (not shown) for holding the door 1 open is provided with a sliding member 7 as in the above-described first embodiment.
6 comprises a stopper movable body protruding from the distal end of the sliding member 6 and a stopper fixed body for locking or unlocking the movable movable stopper. Is fixed in the guide 11 in which the stopper movable body protruding is located. The automatic closing mechanism 7
The spring member 9 acting in the direction to close the door 1 constituting
As in the first embodiment, a torsion spring is disposed in the main body case, the turning member 93 is locked on the upper end of the torsion spring, and the lower end of the torsion spring is adjustably fixed by a locking pin. The spring member configured to be locked on the upper side is turned upside down and provided so as to be embedded in the upper frame 4. Other basic configurations and operations of the automatic door closing device of the present embodiment are the same as those of the first embodiment.

[0033]

According to the automatic door closing device of the present invention, the structure and manufacturing are simple, the door can be opened and closed smoothly at all times, and the link that moves following the opening and closing of the door is connected to the upper surface of the door. An automatic door closing mechanism, which is stored in a gap between the upper frame of the opening and a damper member for regulating the swing speed of the link, is disposed on one of the lower surface of the upper frame and the upper end of the door. Because of this, the structure is simple and easy to install, and when the door is closed, the automatic closing device is not visible at all from the outside,
The appearance of the door can be reduced.

Further, by forming a groove for securing the minimum flow rate of the hydraulic oil flowing through the cylinder along the entire length of the valve seat surface, clogging of the ball valve due to fine dust can be prevented when the door is opened and closed. It can be naturally removed by the movement, and is easier to manufacture than the conventional method of perforating a fine hole, thereby improving the operation reliability.

Further, by providing the automatic door closing mechanism with a stopper mechanism consisting of a stopper fixed body and a movable stopper body swingably mounted on the sliding body side, the door can be opened without using parts such as a door stop. It can be kept open.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of an automatic door closing device according to the present invention, with a door opened.

FIG. 2 is a front view of the same; FIG.
(B) shows a state where the door is closed.

3A and 3B are explanatory views of an automatic door closing mechanism, wherein FIG. 3A is a sectional view of a damper member, FIG. 3B is a plan view of a sliding body, and FIG. 3C is an enlarged sectional view of a ball valve portion.

4A and 4B are explanatory views of a stopper mechanism, in which FIG. 4A is a plan view and FIG. 4B is a longitudinal sectional side view.

FIG. 5 shows explanatory views of a spring member, where (a) is a plan view,
(B) is a partial front sectional view, and (c) is a bottom view.

6A and 6B are explanatory views of a modification of the spring member, where FIG. 6A is a plan view, FIG. 6B is a partial cross-sectional front view, and FIG. 6C is a bottom view.

FIG. 7 is a plan view showing a second embodiment of the automatic door closing device according to the present invention, with the door opened.

[Explanation of symbols]

 Reference Signs List 1 door 11 guide 2 pillar 3 hinge 4 opening upper frame 5 guide 51 guide rail 6 link 7 automatic closing mechanism 71 damper member 72 piston rod 73 guide pipe 74 rod 76 sliding member 77 guide roller 78 tension spring 79 roller shaft 8 stopper mechanism 81 Stopper movable body 82 Stopper fixed body 83 Spring 84 Shaft 9 Spring member

Claims (3)

[Claims] 1. A link which is provided between a door and an upper frame of an opening and moves according to opening and closing of the door, and an automatic closing mechanism provided on one of a lower surface of the upper frame of the opening and an upper end of the door. The automatic closing mechanism comprises a guide along the lower surface of the opening upper frame or the upper end of the door, a sliding body that moves in the guide according to opening and closing of the door, and a speed control by regulating the flow rate of the hydraulic oil in one direction. A damper member for adjustment, a piston rod having one end fixed to the piston of the damper member and the other end slidably fitted to a guide pipe having the other end fixed to a sliding body, and a piston rod slidably fitted to the damper member side. An automatic closing device for a door, comprising a tension spring for urging and a spring member acting in a direction to close the door. 2. An oil guide groove through which hydraulic oil flows through a piston of a damper member, a valve seat surface formed on an opening end face of the oil guide groove, on which a ball valve sits, and a ball valve on the valve seat surface. 2. The automatic closing device for a door according to claim 1, wherein a small groove engraved on a valve seat surface for conducting the oil guide groove when the seat is seated is formed. 3. The automatic door closing mechanism according to claim 1, wherein the automatic door closing mechanism is provided with a stopper mechanism including a stopper fixed body and a movable stopper body swingably mounted on the slide body side. Closure device.