JP3374109B2 - Automatic door closing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door closing device, and more particularly to a door opening device that can be operated lightly, and the closing can be easily adjusted according to the weight of the door, etc. The present invention relates to an automatic door closing device that can be closed at any time, and that can hold an open state of the door and perform a reclosing operation only by opening and closing the door without using other parts or the like.

[0002]

2. Description of the Related Art Conventionally, doors attached to entrances and other entrances and exits are sometimes provided with an automatic closing device for automatically closing an opened door. By the way, an automatic door closing device that has been widely used in the past is filled with hydraulic oil in a casing, and the inside of a cylinder provided in the casing, or this casing also serves as the cylinder, and the door is closed in the cylinder. Inside the casing or cylinder, there is a piston that moves following the opening / closing operation and a needle valve that adjusts the amount of hydraulic fluid between the cylinder top and bottom sides to adjust the closing speed of the door. A spring for moving the piston in the direction of closing the door is provided in the. Then, the main body of the automatic closing device of this door is attached to the door side, and the upper side of the fitting frame or the fixed side such as the Kamoi, Naka Kamoi,
The tip of a link that is pivotally mounted so as to be bendable is attached to this 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 is installed in the piston or cylinder separately from the needle valve so that the door automatically closes at a slower speed than the minimum speed for speed adjustment by adjusting the oil amount. The holes are drilled to ensure the minimum flow rate of hydraulic oil flowing between the left and right chambers in the cylinder.

[0003]

SUMMARY OF THE INVENTION In the conventional automatic door closing device, a main body including a casing containing a cylinder, a needle valve, a spring, etc. and filled with hydraulic fluid, and a main body made of a casing capable of bending and stretching. Although it is composed of an installed link, the device itself is extremely bulky in order to close the door by the spring pressure stored in the main body.
Therefore, if this door automatic closing device is attached to the upper part of the door in an external form, it has to be installed in a position that is conspicuous in terms of the appearance of the door, impairing the appearance of the door, and the installation location of the door automatic closing device. The automatic closing device for many types and colors of doors must be prepared according to the material and color of the door, which causes a problem of increased cost.

Further, since the working oil is sealed in the cylinder, it is necessary to prevent oil leakage and the like, which requires precision in the manufacture of the cylinder and the flow rate of the working oil by the needle valve. The inner diameter of the orifice provided separately from the flow path adjusted to be 0.2 to 0.3
Since the diameter is extremely small, such as mm, the particles may be clogged with fine dust mixed in the hydraulic oil, or wear debris of a member generated due to wear of the member during use, for example, debris due to packing fragments or the like. Moreover, this orifice is
Since it is only released at the inlet / outlet of the hydraulic oil, there is a problem that the dust once entering the orifice is not easily discharged, and if the orifice is clogged like this, the door cannot be closed reliably. .

The present invention solves the problems of the conventional automatic door closing device described above, operates without using hydraulic oil, and has a simple structure and manufacture, and the opening and closing force of the door is always adjustable. It is an object of the present invention to provide an automatic door closing device that can smoothly close the door and that does not appear from the outside when the door is closed and that makes the appearance of the door clean.

[0006]

In order to achieve the above object, an automatic door closing device of the present invention is provided between a door and an upper frame of an opening, and a link that moves following the opening and closing of the door and an opening above the opening. It consists of an automatic door closing mechanism arranged on either the frame or the upper part of the door, and the automatic door closing mechanism is connected to the guide along the upper frame of the opening or the door and one end of the link, and according to the opening and closing of the door The sliding body that slides in the guide, the flow rate of air in one direction, and the air damper member that adjusts the speed when the door is closed by the air pressure generated in the cylinder, and one end of which is fixed to the piston of the air damper member. An automatic door closing device comprising a piston rod having an end fixed to a sliding body and a spring mechanism for urging the door in a closing direction.
The structure includes a torsion spring and a torsion spring in a tubular body.
A spring holder that can be twisted from the outside
The cam that acts as a chi and the mesh that engages with this
It is characterized in that the cam shaft for fixing is housed .

In the automatic door closing device of the present invention, when the door is opened, the piston of the air damper member can be moved with a low load through the link to perform the door opening operation lightly and the door can be closed. During operation, the piston moving in the return direction compresses the air in the cylinder and gradually increases the piston's movement resistance, making the door closing speed relatively fast in the initial stage according to the door closing angle, and slower just before closing. As described above, the door can be surely closed while preventing injury such as finger packing. Also, by using the air damper member, the structure of the automatic door closing mechanism is compact and the manufacturing is simple, and it can be attached to either the upper frame side of the opening or the door side, and the automatic door closing when the door is closed. The device is completely invisible from the outside, and the appearance of the door can be made neat.

In particular, the torsional force of the spring mechanism can be adjusted by inserting a wrench or the like into the spring mechanism body from the outside of the body embedded and fixed in the upper part of the door or the opening upper frame, so that the door can be mounted. The door closing force can be easily adjusted either before or after mounting, and the door can be surely closed with a closing force suitable for each door.

Further, in this case, the spring mechanism can be constructed so that the biasing force of the torsion spring can be adjusted by an external operation while being attached to the door side or the opening upper frame.

Thus, after the automatic closing device is mounted, the urging force of the torsion spring can be adjusted to be increased or decreased. Therefore, when the urging force of the torsion spring is weakened when mounting on a door or the like, the mounting can be easily performed. Moreover, it is possible to easily adjust all the doors properly by adjusting the required urging force after mounting.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the automatic door closing device of this embodiment, as shown in FIGS. 4 and 5, a spring mechanism 2 for urging the automatic door closing mechanism 1 toward the door D and a direction for closing the door D is provided. The automatic door closing mechanism 1 and the spring mechanism 2 are attached to the upper frame F such as the upper frame.
The links 3 are used to connect the two.
The support of the door D is provided on the pillar H or the like so as to be openable and closable via the hinge T, so that the link 3 is inserted into the gap G formed between the door D and the opening upper frame F. It is constructed so as to rotate around the spring mechanism 2 following the opening and closing of the door D.

As shown in FIGS. 1 and 2, the automatic door closing mechanism 1 has an air damper member having a diameter and a length such that a piston 1P is fitted therein and can be embedded in an upper portion of a door D or an opening upper frame F. 1A and a guide 1B having a square pipe shape and having a stopper mechanism 1S inside are joined together via a joint 1C 1
It consists of sticks of books. Hereinafter, as shown in FIG. 4, in the present embodiment, a case will be described in which the automatic door closing mechanism 1 is installed so as to be embedded in the upper portion of the door D, but the present invention is not limited to this use example, and the automatic door closing is performed. Open the upper frame F of the mechanism 1.
It is also possible to dispose the spring mechanism 2 along with the spring mechanism 2 so as to be embedded in the upper portion of the door D so as to be used.

The air damper member 1A is hermetically closed by fitting a plug 11 to one end of a round pipe material to form a cylinder 10 of the air damper member, and a short tubular joint 1C is fitted and fixed to the other end. The piston 1P is formed so as to be slidably fitted between the plug 11 and the joint 1C. The length of the air damper member 1A is a stroke in which the piston 1P moves in response to opening and closing of the door D. To determine.

The piston 1P is provided with a piston rod 12 protruding from the joint 1C so as to be inserted into the guide 1B. The piston 1P does not act in the opening direction of the door inside the piston 1P. First, the air passage is formed with the ball valve 13 for adjusting the air pressure for adjusting the speed in the closing direction. Orifices 14 formed at both ends of this air passage
The a and 14b are formed by opening at different positions so as to sandwich the seal 15 fitted to the outer peripheral surface of the piston. The ball valve 13 has a through hole 14 which is a part of an air passage.
The spring S is inserted into the valve seat so as to be pressed by a required biasing force. Further, the pressing force of the ball valve 13 against the valve seat can be adjusted by rotating the screw 17 screwed to the piston, so that the elastic force of the spring S can be adjusted, thereby adjusting the speed at which the door is opened. To do so.

As described above, by forming the air passage communicating with the inside and outside of the cylinder and the ball valve 13 for limiting the flow rate of air in one direction in the piston 1P, the piston 1P is hermetically sealed in the left direction in FIGS. When moving toward the plug 11, the piston 1P moves to compress the air in the cylinder 10 of the air damper member, and the air pressure and the spring pressure of the spring S press the ball valve 13 toward the valve seat side. The air passage is completely sealed, so the piston 1P
The air pressure in the cylinder 10 of the air damper member is increased by the movement of the air damper member, and acts to gradually increase the resistance to the movement of the piston 1P. The speed is adjusted so that the speed becomes slower as it increases. On the contrary, when the door is opened, when the piston 1P moves to the right side in the drawing, a negative pressure is generated inside the cylinder 10 of the air damper member 1A that is hermetically sealed according to the movement of the piston 1P. Due to this negative pressure, the ball valve 13 is opened so as to be separated from the valve seat against the spring pressure of the spring S, and the orifices 14a and 14b of the air passage are electrically connected to each other, whereby the ball valve 13 is connected to the outer peripheral portion of the piston 1P. Air is introduced into the cylinder 10 through a slight gap with the inner surface of the cylinder. Thereby, air resistance does not act on the movement of the piston 1P, the movement of the piston 1P is smooth, and the opening operation of the door D can be performed lightly.

On the other hand, the rectangular pipe-shaped guide 1B is provided with a stopper device 1S inside the tip portion on the side opposite to the air damper member 1A. In this stopper device 1S, a pin 18P is inserted into the base side of a stopper cam 18 having a hook-shaped tip, and both ends of the pin are swingably supported by a guide 1B. To support the pin 18P on the guide 1B, the pin 18P penetrating the stopper cam 18 is inserted into the elongated hole 1H formed in the guide 1B, whereby the stopper cam 18 swings about the pin 18P. At the same time, it can move in the direction of the long hole using the long hole 1H as a guide. Further, a spring S2 is interposed between the stopper cam 18 and the stopper 19 fitted and fixed to the end of the guide 1B and the base end of the stop cam, and the stopper cam 18 is constantly pressed by the spring pressure toward the air damper member 1A side. Then, the stopper cam 1
8 between the back surface of the hook portion and the inner surface of the guide 1B.
1, the hook portion side of the stopper cam 18 is urged so as to be pushed down in FIG. 2 and can be locked with the stopper movable body 16 on the piston rod 12 side.
As shown in FIG. 2, the hook portion has a tip end side inclined surface 18a.
The engaging piece 18b protruding between the rear end side inclined surface 18c and the rear end side inclined surface 18c is formed in a V shape at the tip of the stopper cam 18.

At the tip of the piston rod 12, a stopper movable body 16 is formed integrally with a sliding body to which one end of the link 3 is rotatably connected. As shown in FIG. 3, the movable stopper 16 has a hook-shaped engaging piece 16a projecting from the distal end thereof, which can be engaged with the hook portion of the stopper cam 18, and the movable stopper 16 is moved by the movement of the piston 1P. The guide wheel 16G is rotatably provided so as to move smoothly in the guide 1B. The guide wheel shaft 16S that rotatably supports the guide wheel 16G has a long hole H formed in one side surface of the guide 1B.
One end of the link 3 is connected to the guide wheel shaft 16S that penetrates through the guide wheel shaft 16S. As a result, when the link 3 moves along with the opening and closing of the door D, the guide wheel shaft 16 can move along the elongated hole H of the guide 1B, and a smooth door opening / closing operation can be performed.

The air damper member 1A and the joint 1C are integrally fixed with a knock pin 1N. The joint 1C and the guide 1B are attached by screws (not shown). The air damper member 1A and the guide 1B are formed into a single rod-like member through the via, and can be embedded in the upper frame of the door or the upper frame of the opening frame, and the piston moves inside the air damper member in accordance with the opening / closing operation of the door. Make it possible to move smoothly.

Further, the spring mechanism 2 is, as shown in FIG. 6, a cylindrical main body 21 having a mounting flange 21a embedded in the upper frame F or the door D side and capable of being screwed, and this main body. A spring stopper 2 that is rotatably fitted in the inside 21
3 and the spring stop groove 2 formed in the inner bottom portion of the cylindrical main body 21.
1b and spring stopper groove 23 formed on the lower surface of spring stopper 23
a torsion spring 26 that is locked so as to be hung between b,
A cam 2 which is inserted into a cam fitting insertion hole 23a formed in the upper part of the spring stopper 23 through a pressing spring 27 in a rotation-stopped state.
4, a cam shaft 25 which is rotatably locked in one direction with the cam 24, and an inner peripheral surface of the cam shaft 25 which is prevented from protruding from the cylindrical main body 21 by the action of the pressing spring 27. An upper lid 22 is formed to form a stepped cam shaft fitting hole 22d and rotatably press and support the cam shaft 25 to fix the cam shaft 25 to the main body 21.

The mounting flange 21a of the main body 21 and the upper lid 22 have the same planar shape, and when the upper lid 22 is overlaid on the mounting collar 21a, the projection 22a on the upper lid 22 side is placed in the locking hole 21c of the mounting collar 21a. When the spring mechanism 2 is inserted and locked with a screw 22B and is embedded in the upper frame F or the door D side with a screw, the spring mechanism 2 is integrated.

As shown in FIG. 8, the spring stopper 23 has a bottomed cam fitting insertion hole 23a and a lower portion with a diameter smaller than the main body of the spring stopper 23 by the wire diameter of the torsion spring 26. The boss portion 23d thus formed is projected, and the spring stop groove 23b is formed in the boss portion 23d. The shape of the cam fitting hole 23a is
The cam fitted in the hole has a shape such that it moves in the vertical direction but does not rotate in the circumferential direction, for example, an elliptical shape having a rotation preventing shape as shown in the drawing.

As shown in FIG. 9, the outer shape of the cam 24 is determined so that the cam 24 is fitted into the cam fitting hole 23a of the spring stopper 23 in a non-rotating manner, and the cam 24 has a one-way clutch on its upper surface. Claws or sawtooth claws to act 2
At least two 4a are projected at equal intervals, a spring fitting hole 24b for fitting the pressing spring 27 is formed on the lower surface, and a polygonal shape, for example, a hexagonal shape is formed on the upper surface of the central portion. An adjustment hole 24c for adjusting the elastic force of the torsion spring is formed.

As shown in FIG. 10, the cam shaft 25 has an outer diameter which is rotatably fitted in the main body 21, and has a link stopper shaft 25a at the upper portion so as to project through the upper lid and a cam. The shaft 25 has a diameter smaller than that of the main body and has a shape such that the link to be fitted is a rotation stopper, for example, a square shape as shown in the drawing, and the link stopper shaft 25 is formed at the center of the main body.
A through hole 25c is formed so as to also penetrate a, and a screw hole 25b for preventing the link 3 from coming off is formed in a part of the link stopper shaft 25a. Angle-shaped or saw-teeth shaped claws 25d that act as a one-way clutch capable of engaging with the claws 24a of the cam 24 are formed on the outer peripheral portion at each required angle. This cam 2
The four claws 24a and the claws 25d of the cam shaft 25 are shaped so as to mesh with each other in one direction of rotation of the cam and not mesh with each other in the opposite direction of rotation, thereby acting as a one-way clutch. To

As shown in FIG. 11, the torsion spring 26 is formed by winding it in a coil shape.
Both ends 26a and 26b are bent to form an engaging piece.
When 6a is locked to the cam shaft 25 or the link shaft 27 side and the other end 26b is locked to the spring stopper 23 side, respectively, when the cam shaft 25 or the link shaft 27 and the spring stopper 23 are rotated freely, the rotation thereof is performed. The deviation is transmitted to the torsion spring 26 so that the spring is twisted. As a result, when the link 3 rotates in response to the opening operation of the door D, the cam shaft 25 or the link shaft 27 is simultaneously rotated via the link stop shaft of the cam shaft fitted to the link 3 to link the torsion spring 26. The urging force for urging the door D in the closing direction is stored via the unit 3. In addition, in this embodiment, when the door D is closed, the spring mechanism 2 is set to a state in which the biasing force that biases the torsion spring 26 in the direction of closing the door D via the link 3 remains, and the opening upper frame is set. It is provided on the F side or the door side, and the biasing force of the torsion spring can be adjusted by an external operation while the spring mechanism 2 is attached to the door side or the opening upper frame.
Then, when the door D is closed, the link 3 is rotated via the cam shaft 25 or the link shaft 27 by the biasing force of the torsion spring 26 that stores the biasing force in the closing direction. Use it to close the door D.

Next, the order of assembling the spring mechanism 2 using the components constructed as described above will be described. Body 2
The torsion spring 26 is inserted into the inside of 1. At this time, one end 26a of the torsion spring is locked in the spring stop groove 21b on the inner bottom surface of the main body, and the other end 26b is locked in the spring stop groove 23b of the spring stopper 23 inserted into the main body 1. The cam 24 is fitted into the cam fitting hole 23a of the spring stopper 23 via the pressing springs 27, 27. In this case, the pressing spring 27 is
4 of the cam shaft 25 and the claw 24 of the cam 24 which are urged so as to always push up and are fitted and supported by the upper lid 22.
Make sure to mesh with a. Since the camshaft fitting insertion hole 22d having a stepped inner peripheral surface is bored in the upper lid, the stepped surface formed on the outer peripheral surface of the camshaft 25 is brought into contact with the hole 22d,
Although allowing the cam shaft 25 to rotate, the cam shaft 25 is prevented from coming out of the main body.

In order to increase or decrease the strength of the torsion spring, the screw mechanism 2 is attached to the through hole 25c from the outside of the upper end (in FIG. 6) of the cam shaft to the adjusting hole 24c. When a tool, for example, a hexagon wrench (not shown) is inserted and fitted into the adjustment hole 24c and the wrench is rotated, the cam 24 is also rotated. This cam 24
Since the spring stopper is fitted into the spring stopper in a rotation-stopped state, the spring stopper 23 also rotates together, and the torsion spring can be rotated in the twisting direction to increase the strength of the torsion spring. On the other hand, in order to weaken the strength of the torsion spring, the hexagon wrench inserted in the adjustment hole 24c is pushed so that the tip of the hexagon wrench pushes the inner bottom of the adjustment hole 24c, so that the pushing spring is not affected. Then, the cam 24 is pushed down, the engagement between the pawls with the cam shaft is released, and the hexagon wrench is rotated in the direction opposite to the direction of increasing the strength of the cam shaft.

As shown in FIG. 7, the link 3 can be inserted into a gap G between the door D and the opening upper frame F, and when the door D is closed, it is completely immersed in the gap G and outside the door D. Make a thin plate so that it is not exposed. In addition, one end of the link 3 is shown in FIG.
As shown in FIG. 5, a rectangular hole 31 for fitting and locking the rectangular link stop shafts 25a, 27a at the upper end of the cam shaft 25 or the link shaft 27 is formed, and the other end is a stopper provided at the tip of the piston rod. The guide wheel shaft hole 32 is formed so that the guide wheel shaft 16S of the movable body 16 can be mounted.

Next, the operation of the automatic door closing device of the embodiment shown in FIGS. 1 to 11 will be described. When you open the door D,
The link 3 locked to the spring mechanism 2 fixed to the upper part of the door or the upper frame of the door rotates around the cam shaft 25 as an axis following the operation thereof, and the stopper movable body (the movable end of the link 3 is locked). The sliding body 16 moves in the guide 1B according to the rotation of the link 3. At this time, the piston 1P also moves inside the cylinder 10 of the air damper member 1A to the side opposite to the plug 11 (to the right in FIG. 1) via the piston rod 12 to which the movable stopper body 16 is fixed. This piston 1P
At the time of the movement, a negative pressure is generated in the cylinder 10 of the air damper member, the ball valve 13 is separated from the valve seat against the spring pressure, and the air damper member 1A is opened by the air passage member 1A from the opened air passage. Air is sucked into the piston 1
The movement of P and the stopper movable body 16 is performed lightly.

Then, at the position where the stopper movable body 1 is opened up to the set fully opened angle, the stopper movable body 1 is moved to the positions shown in FIGS.
When the stopper 6 moves, the hook-shaped engaging piece 16a of the stopper movable body 16 moves the inclined surface 1 of the hook portion of the stopper cam 18.
8a slides. As a result, the stopper cam 18 retracts along the elongated hole 1H against the spring S2, and the tip end side thereof is temporarily pushed up against the spring S1 and passes through the hook portion of the stopper cam 18. Time point, about 1
When the stopper cam 18 is opened to about 10 degrees, the stopper cam 18 is pushed back by the spring S2, the hook portion of the stopper cam 18 and the hook-shaped engaging piece 16a are locked, and the door is opened (9
It is held at 0 degrees.

Next, when the door D is closed from the open state,
When you pull or push the door D in the direction to close it strongly, this door D
Swinging pushes the stopper movable body 16 via the link 3, and the hook movable engagement member 16 of the stopper movable body 16
a pushes up the hook portion of the stopper cam 18 again against the spring, the engaging piece 16a disengages from the hook portion of the stopper cam 18, and the engagement between the engaging piece 16a and the hook portion of the stopper cam 18 is released. , The piston rod 12 and the piston 1P are moved in the direction opposite to that when the door is opened. When the stopper movable body 16 and the stopper cam 18 are released from each other, the force of the torsion spring 25 of the spring mechanism 2 twisted when the door is opened acts to forcibly rotate the link shaft 22. Since the link 3 is locked to the link shaft 22, the rotation of the link shaft 22 forcibly rotates the link 3, and the door D swings in the direction closed by the torsion spring 25. Move.

When the piston D moves in the cylinder 10 toward the plug 11 by swinging the door D in the closing direction, the ball valve 13 compresses the pressure of the spring and the compressed air on the head side of the air damper member. Cylinder 1 that is closed because it is pressed to the valve seat side by force and the air passage is closed
The air inside 0 is compressed. At the beginning of closing the door D, the compression rate of the air in the cylinder 10 is low, so the moving speed of the piston is high, but the air pressure in the cylinder 10 increases as the piston moves. In this way, the pressure increase of the compressed air gradually becomes a state in which the movement of the piston is braked, the speed at which the door D is closed becomes gradually slower, and becomes slower at the position immediately before the complete door closing. However, the door is securely closed by the action of the torsion spring.

In this automatic door closing device, only the link 3 is exposed to the outside of the door D, and when the door D is completely closed, the link 3 is also closed as shown in FIG. Since it is stored in the gap formed between the upper surface of D and the opening upper frame F, this automatic door closing device cannot be seen from the outside.

The embodiment of the present invention has been described above. However, even if the air in the cylinder when the door is closed is somewhat leaked, the function and effect can be achieved, and conversely, the air can be positively leaked. It is also possible to adjust the closing speed of the door by adjusting the leakage amount.

FIG. 12 shows another embodiment of the spring mechanism 2, which is embedded in the upper frame F or the door D side of the opening and can be screwed in the same manner as the embodiment shown in FIG. And a cylindrical main body 21 having a mounting flange
1, a link shaft 27 that is rotatably fitted within an allowable angle, and a spring stopper 23 that is fitted to the link shaft 27 in a freely rotatable manner and that is fitted and inserted into the main body 21.
A torsion spring 26 that is inserted into the main body 21 and that locks the link shaft 22 and the spring stopper 23 so as to be suspended between them.
And the torsion spring 26, the link shaft 27, the spring stopper 2
3 is enclosed in the main body 21, and comprises a back cover 28 fitted and fixed on the side opposite to the mounting flange of the main body 21.

Incidentally, the spring stopper 23 in this embodiment.
Is formed with a protrusion (not shown) fitted into a plurality of notches (not shown) formed in the main body 21, so that the protrusion is fitted into the tubular main body 21 so as not to rotate, and
By rotating the spring stopper 23 so that it is fixed at a predetermined angle position by this protrusion, the torsion spring 26 is twisted by the twist generated between the spring stopper 23 and the link shaft 27, and a rotational force is applied to the link shaft 27. Thus, the closing force of the door D can be adjusted according to the weight of the door. In this embodiment, the pressure of the torsion spring is adjusted by rotating the back cover 28, and since the other constructions and operations are the same as those of the embodiment shown in FIG. 6, detailed description thereof will be omitted.

[0037]

According to the automatic door closing apparatus of the present invention, when the door is opened, the piston of the air damper member can be moved with a low load through the link, and the door can be opened lightly. During the door closing operation, the piston moving in the return direction compresses the air in the cylinder to gradually increase the movement resistance of the piston, so that the door closing speed is relatively fast at the beginning according to the door closing angle, and immediately before closing. The door can be securely closed while preventing injuries such as finger stuffing so that it can be slowed down. Furthermore, by using an air damper member, the structure of the automatic door closing mechanism is compact and easy to manufacture. The door can be attached to either the upper frame side of the opening or the door side, and when the door is closed, the automatic door-closing device cannot be seen from the outside, and the appearance of the door must be clean. Kill.

In particular, a spring mechanism is provided in a tubular body, a torsion spring, a spring receiver capable of externally adjusting the torsion spring, a cam acting as a one-side clutch, and this. Since the camshaft that meshes and fixes the link is housed and configured, the torsional force of the spring mechanism can be easily adjusted from the outside before or after mounting the door, so it is always The door can be surely closed with a closing force suitable for each door.

Further, since the spring adjusting mechanism can adjust the biasing force of the torsion spring from the outside, it is possible to adjust the increase or decrease of the biasing force of the torsion spring after the automatic closing device is mounted. At this time, if the biasing force of the torsion spring is weakened before mounting, the mounting can be easily performed, and after the mounting, the required biasing force can be easily adjusted to properly close all the doors.

[Brief description of drawings]

FIG. 1 shows an automatic door closing mechanism of an embodiment of an automatic door closing device according to the present invention, where (A) is a sectional view showing a state in which the door is completely closed, and (B) is a view immediately before the door is completely opened. Sectional view of the state,
(C) is a sectional view of a state in which the door is completely opened.

2A and 2B show the same automatic door closing mechanism, FIG. 2A is a sectional view of an air damper member, FIG. 2B is a sectional view of a guide portion, and FIG.

FIG. 3 shows a movable stopper body, (A) is a plan view,
(B) is a sectional view.

FIG. 4 is a plan view showing an opened / closed state of a door equipped with an automatic closing device.

FIG. 5 shows the opened / closed state of the door equipped with the automatic closing device,
(A) is a front view showing a state where the door is completely opened, and (B) is a front view showing a state where the door is completely closed.

FIG. 6 is a sectional view of a spring mechanism.

FIG. 7 shows a link, (A) is a plan view, (B) is a front view, and (C) is a bottom view.

FIG. 8 shows a spring stopper, (A) is a plan view, (B) is a vertical sectional front view, and (C) is a bottom view.

FIG. 9 shows a cam, (A) is a plan view, (B) is a partially cutaway front view, (C) is a bottom view, and (D) is a side view.

FIG. 10 shows a cam shaft, (A) is a plan view, (B) is a vertical sectional front view, (C) is a bottom view, and (D) is a partially broken side view.

FIG. 11 shows a torsion spring, (A) is a front view, (B)
Is a plan view.

FIG. 12 is a sectional view showing another embodiment of the spring mechanism.

[Explanation of symbols]

D door F opening top frame 1 Automatic door closing mechanism 1A Air damper member 1B guide 1C fitting 1P piston 1S stopper mechanism 10 cylinders 12 piston rod 16 Stopper movable body (sliding body) 18 Stopper cam 2 spring mechanism 21 body 22 Top cover 23 Spring stopper 24 cams 25 cam shaft 26 Torsion spring 3 links

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Claims (2)

(57) [Claims] 1. A link which is installed between a door and an upper opening frame and moves in accordance with opening and closing of the door, and an automatic door closing mechanism arranged on either the upper opening frame or the upper part of the door, The automatic door closing mechanism is connected to one end of the link and the guide along the upper frame of the opening or the door, and the sliding body that slides in the guide when the door is opened and closed, and restricts the air flow rate in one direction. An air damper member that adjusts the speed when the door is closed by the air pressure generated in the cylinder, a piston rod whose one end is fixed to the piston of the air damper member, and the other end is fixed to the sliding body, and a spring mechanism that biases the door in the closing direction. Door with and
In the automatic closing device of,
Twisting spring inside and adjusting twisting spring from outside
Enabled spring support and one-sided clutch acting
And a cam shaft that meshes with this and fixes the link
Automatic closure device of the door, characterized by being configured pay. 2. The door according to claim 1, wherein the spring mechanism is configured so that the biasing force of the torsion spring can be adjusted by an external operation while being attached to the door side or the opening upper frame. Automatic closing device.