JP2001193345A - Automatic door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply structure automatic door closer which operates without hydraulic fluid, can easily be produced and always open and close smoothly and also makes the appearance of a door neat by making the device invisible from the outside when the door is closed. SOLUTION: This door closer is provided with a link which is constructed between the door and the opening upper frame and moves following the opening and closing of the door, a guide 1B wherein an automatic door closing mechanism 1 is arranged in either the opening upper frame or an upper section and the door closing mechanism 1 is arranged along the opening frame or the upper section of the door, a slide body 16 connected to one end of the link and sliding in the guide 1B following the opening and closing of the door, and air damper member 1A limiting the flow rate of air in one direction and adjusting the door speed when the door closes by the air pressure generated in a cylinder 10, a piston rod 12 wherein one end of the piston rod 12 is fixed to the piston 1P of the air damper member 1A and the other end is fixed to the slide body 16, and a spring mechanism 2 to energize the door in the direction to close the door.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically closing a door, and more particularly to a device for automatically opening and closing a door, easily adjusting the closure according to the weight of the door, etc., and always properly and automatically. The present invention relates to an automatic door closing device capable of closing the door in an open state and performing the operation of holding and re-closing the door in an open state 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 are sometimes provided with an automatic closing device for automatically closing an open door. By the way, the automatic closing device of the door which has been widely used in the past is filled with a working oil in a casing, 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 with the spring pressure contained 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 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.

In addition, since the hydraulic oil is sealed in the cylinder, it is necessary to prevent oil leakage and the like, so that the cylinder must be manufactured with high accuracy and the flow rate of the hydraulic oil is controlled by a needle valve. The inner diameter of the orifice provided separately from the flow path for adjusting the diameter is 0.2 to 0.3.
Since the diameter is extremely small, such as mm, it may be clogged with fine dust mixed in the hydraulic oil, or wear debris of the member generated due to wear of the member during use, for example, debris due to broken packing and the like. And this orifice
Since the hydraulic fluid is only released at the inlet / outlet of the hydraulic oil, dust that has once entered the orifice is not easily discharged, and if the orifice is clogged in this way, there is a problem that the door cannot be reliably closed. .

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional automatic door closing device, operates without using hydraulic oil, has a simple structure and manufacture, and always adjusts the opening and closing force of the door. It is an object of the present invention to provide an automatic door closing device that can smoothly close the door and can make the appearance of the door invisible when the door is closed.

[0006]

In order to achieve the above object, an automatic door closing device according to the present invention is provided with a link which is provided between a door and an upper frame and moves along with the opening and closing of the door. It consists of an automatic door closing mechanism arranged in the upper part or the upper frame of the opening, and the automatic door closing mechanism is a guide along the upper part of the door or the upper frame of the opening,
A sliding body that is connected to one end of the link and slides in the guide according to opening and closing of the door, an air damper member that limits the flow rate of air in one direction, and adjusts the speed at the time of closing the door by air pressure generated in the cylinder, An automatic door closing device comprising: a piston rod having one end fixed to a piston of an air damper member and the other end fixed to a sliding body; and a spring mechanism for urging the door in a closing direction. , A torsion spring, a spring receiving member capable of adjusting the torsion spring from the outside, a cam acting as a one-way clutch, and a cam shaft meshing with the cam and fixing the link. The camshaft and the cam are formed with an insertion hole for inserting a predetermined twist adjustment jig through the camshaft and the cam, and the tip end of the jig is rotated by a spring receiver. Mating mating possible Forming a, and the insertion hole of the cam, characterized in that the formation of the contact piece which is pressed by the stepped portion formed in the vicinity of the tip portion of the jig.

This automatic closing device for a door can move the piston of the air damper member through a link with a low load during the opening operation of the door, and can perform the opening operation of the door lightly. By compressing the air in the cylinder with the piston moving in the return direction and gradually increasing the movement resistance of the piston, the closing speed is initially relatively fast according to the closing angle, and becomes slow immediately before closing. To
The door can be securely closed while preventing injury such as finger stuffing. In addition, by using the air damper member, the structure of the automatic door closing mechanism is compact and easy to manufacture, and can be attached to either the door side or the opening upper frame, and the automatic door closing device when the door is closed. Can be seen from outside, and the exterior of the door can be made clear. Also, since the torsion force of the spring mechanism can be adjusted by inserting a jig into the spring mechanism main body from the top of the door or the outside of the main body embedded and fixed in the upper frame of the opening, before or after the mounting of the door. In any case, the adjustment of the door closing force can be easily performed, and the door can always be closed with a closing force suitable for each door, and the automatic closing device is attached. Adjustment of the biasing force of the torsion spring can be adjusted later, so when mounting to a door etc., if the biasing force of the torsion spring is reduced and installed, it can be easily installed and easily adjusted to the required biasing force after installation Thus, all doors can be properly closed. In particular, when the torsion spring is strengthened, the spring holder can be directly rotated together with the cam, whereby the twisting adjustment jig of the cam can be prevented from twisting and the movement of the cam can be kept smooth. When the torsion spring is weakened, the cam and the camshaft are disengaged by pressing the contact piece of the cam insertion hole by the step formed near the tip of the twist adjusting jig. The spring holder can be rotated in the reverse direction.

[0008] In this case, the piston of the air damper member communicates with the inside and outside of the cylinder to conduct air, a valve seat surface formed at the opening end surface of the communication hole, and the piston is urged by the valve seat surface. And a seated ball valve.

Thus, when opening and closing the door, the flow of the air in one direction can be reliably restricted by moving the ball valve, and the reliability of operation is improved.

[0010] The automatic door closing mechanism may be provided with a stopper mechanism comprising a stopper cam pivotally mounted on the guide side and a stopper movable body mounted on the sliding body side.

Thus, the door can be kept open only by opening and closing the door without providing a stopper device externally.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the automatic door closing device of this embodiment has an automatic door closing mechanism 1 attached to an open door D side and a spring mechanism 2 for urging the door D in a closing direction. Is attached to an upper frame F of an opening such as a gate, and the automatic closing mechanism 1 and the spring mechanism 2 are connected by a link 3 for use. The door D is supported on a pillar H or the like so as to be openable and closable via a hinge T so that the link 3 is inserted into a gap G formed between the door D and the upper opening frame F. It is constructed so as to be installed and rotate around the spring mechanism 2 following the opening and closing of the door D.

As shown in FIGS. 3 and 4, the automatic door closing mechanism 1 has an air damper having a diameter and a length which allow a piston 1P to be inserted therein, and which can be embedded in the upper part of the door D or in the upper frame F of the opening. A member 1A and a stopper mechanism 1 in a square pipe shape
The guide 1B provided with S is joined by a single rod-shaped member via a joint 1C. Hereinafter, as shown in FIG.
In this embodiment, a case will be described in which the automatic door closing mechanism 1 is mounted so as to be buried in the upper part of the door D. However, the present invention is not limited to this use example, and the automatic door closing mechanism 1 is attached along the upper opening frame F. The spring mechanism 2 can be used by being buried in the upper part of the door D and used, and the same operation and effect can be obtained.

The air damper member 1A is hermetically sealed by fitting a plug 11 at 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 at the other end. The piston 1P is formed so as to be slidably fitted between the stopper 11 and the joint 1C. The length of the air damper member 1A is determined by the stroke of the piston 1P moving in response to opening and closing of the door D. Determined to have.

The piston 1P has a piston rod 1 having a length penetrating through the joint 1C and inserted into the guide 1B.
2, and an air passage having a ball valve 13 for adjusting the air pressure for adjusting the speed in the closing direction is formed inside the piston 1P without acting on the opening direction of the door D. . Orifices 14 formed at both ends of this air passage
The openings a and b are formed 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 conduction hole 14 which is a part of an air passage.
Is inserted by the spring S so as to be pressed by a required urging force. Further, the pressing force of the ball valve 13 against the valve seat is determined by adjusting the resilient force of the spring S to the screw 1 screwed into the piston 1P.
7 can be adjusted by rotating the door D.
Be able to adjust the speed when opening.

As described above, the air passage communicating with the inside and outside of the cylinder 10 and the ball valve 1 for limiting the flow rate of air in one direction are provided.
3 in the piston 1P, the piston 1P
When P moves toward the sealing plug 11 in the left direction in FIGS. 3 and 4, the air in the cylinder 10 of the air damper member 1A is compressed by the movement of the piston 1P, and the air pressure and the spring S Ball valve 13 by pressure
Is pressed to the valve seat side, and the air passage is completely sealed, so that the movement of the piston 1P increases the air pressure in the cylinder 10 of the air damper member 1A and gradually increases the resistance to the movement of the piston 1P. In operation, the speed is adjusted in the closing direction of the door D so that the speed is initially high, but the speed becomes slow as the closing angle increases. Conversely, when the door D is opened, when the piston 1P moves rightward in the drawing, a negative pressure is generated inside the cylinder 10 of the sealed air damper member 1A according to the movement of the piston 1P. Due to this negative pressure, the ball valve 13 is separated from the valve seat against the spring pressure of the spring S and opened, and the air passage orifices 14a and 14b are electrically connected to each other. Air is introduced into the cylinder 10 through a slight gap with the inner surface of the cylinder. Thereby, the piston 1
The air resistance stops acting on the movement of P and the piston 1P
Is smoothly moved, and the opening operation of the door D can be performed lightly.

On the other hand, the guide 1B in the shape of a square pipe is provided with a stopper device 1S inside the distal end opposite to the air damper member 1A. The stopper device 1S is configured such that a pin 18P is inserted into the base of a stopper cam 18 having a hook-shaped tip, and both ends of the pin are swingably supported by a guide 1B. The pin 18P is supported by the guide 1B by inserting a pin 18P penetrating through the stopper cam 18 into an elongated hole 1H formed in the guide 1B.
Numeral 8 swings about the pin 18P and is movable in the long hole direction using the long hole 1H as a guide. Also,
The stopper cam 18 has a spring S2 interposed between the stopper 19 fitted to the end of the guide 1B and the base end of the stopper cam 18, so that the stopper cam 18 is constantly pressed toward the air damper member 1A by spring pressure. Further, a spring S1 is interposed between the back surface of the hook portion of the stopper cam 18 and the inner surface of the guide 1B, whereby the hook portion side of the stopper cam 18 is urged to push down in FIG. The stopper movable body 16 on the side can be locked. The hook portion is, as shown in FIG.
8a and the engaging piece 18 projecting between the rear end side inclined surface 18c.
b 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. 5, the stopper movable body 16 has a hook-shaped engagement piece
The guide wheel 16G is rotatably provided so as to protrude and move the stopper movable body 16 smoothly within the guide 1B by the movement of the piston 1P. Guide wheel shaft 16S that rotatably supports this guide wheel 16G
Penetrates a long hole H formed on one side surface of the guide 1B, and a guide wheel shaft 16S protruding from the long hole H is provided with a link 3
Are connected at one end. Accordingly, when the link 3 moves 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 the door can be smoothly opened and closed.

The air damper member 1A and the joint 1C are fixed so as to be integrated by a knock pin 1N. The joint 1C and the guide 1B are attached with screws (not shown). , The air damper member 1A and the guide 1B become one rod-like body, and the door D
And the piston 1P can smoothly move in the air damper member 1A following the opening / closing operation of the door D.

As shown in FIG. 6, the spring mechanism 2
A cylindrical main body 21 having a mounting flange 21a embedded in the opening upper frame F or the door D side and capable of being screwed;
A spring holder 2 rotatably inserted into the main body 21
3 and a spring retaining groove 2 formed in the inner bottom of the cylindrical main body 21.
1b and a spring retaining groove 23b formed on the lower surface of the spring receiving member 23
And a torsion spring 26 which is locked in such a manner
And a cam 24 which is inserted into a cam insertion hole 23a formed in the upper part of the spring receiving member 23 through a pressing spring 27 in a detented state, and is rotatably and locked in one direction with the cam 24. A camshaft 25 and a stepped camshaft insertion hole 22d are formed on the inner peripheral surface of the camshaft 25 so that the camshaft 25 does not protrude from the cylindrical main body 21 by the action of the pressing spring 27. And an upper lid 22 which is rotatably pressed and supported and fixed to the main body 21.

The camshaft 25 and the cam 24 are provided with insertion holes 25c and 24c, respectively, through which the camshaft 25 and the cam 24 are inserted to insert a predetermined twist adjusting jig J. A fitting hole 23e is formed in which the tip J1 of the twist adjustment jig J is fitted so as to be able to rotate.

Also, at the bottom of the insertion hole 24c of the cam 24,
A contact piece 24d that is pressed by a step J2 formed near the tip of the twist adjustment jig J is formed.

In this case, the cam shaft 25 and the cam 24
The insertion holes 25c and 24c are formed in a circular cross-section so that the shaft of the twist adjustment jig J can penetrate, and the fitting hole 23e is a polygonal column, for example, a rectangular column-shaped jig. It is formed in a square hole shape that matches the jig tip J1 so that the tip J1 is rotatably fitted.

The bottom of the insertion hole 24c of the cam 24 is
When the contact piece 24d protrudes inward, the fitting hole 2
It is formed in the same square hole shape as 3e.

Thus, the spring mechanism 2 can directly rotate the spring holder 23 when adjusting the strength of the torsion spring 26. That is, when the torsion spring 26 is strengthened, the spring holder 23 can be directly rotated together with the cam 24.
3 is rotated against the torsion spring 26,
Temporary fixation due to twisting occurs between the cam 24 and the spring receiving member 23, so that the sliding of the cam 24 in the cam fitting insertion hole 23a is not hindered. Sliding can be maintained. When the torsion spring 26 is weakened, the contact piece 24d at the bottom of the insertion hole 24c of the cam 24 is pressed by a step J2 formed near the tip J1 of the torsion adjusting jig J. Cam 2
4 can be disengaged from the camshaft 25 and the spring holder 23 can be rotated in the reverse direction.

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

As shown in FIG. 8, the spring receiving member 23 has a bottomed cam fitting insertion hole 23a and a cam fitting insertion hole 2 at its upper part.
A fitting hole 23e into which the tip J1 of the twist adjustment jig J is rotatably fitted is provided at the center of the bottom of the bottom 3a.
3, a boss 23d having a diameter smaller than that of the torsion spring 26 by the diameter of the torsion spring 26 is protruded, and the spring retaining groove 23 is formed in the boss 23d.
b is formed. The shape of the cam fitting hole 23a is such that the cam 24 fitted in the cam fitting hole 23a moves in the vertical direction but does not rotate in the circumferential direction, for example, a detent shape as shown. In an oval or the like.

As shown in FIG. 9, the outer shape of the cam 24 is determined so that it can be inserted into the cam receiving hole 23a of the spring receiving member 23 in a detent-like manner. At least two claw-shaped or saw-tooth-shaped claws 24a are protruded at regular intervals so as to perform the following. On the lower surface, a spring fitting hole 24b for fitting the pressing spring 27 is formed.
At the center, an insertion hole 24c for inserting the twist adjustment jig J is formed, and at the bottom of the insertion hole 24c of the cam 24,
A contact piece 24d that is pressed by a step J2 formed near the tip of the twist adjustment jig J is formed.

As shown in FIG. 10, the cam shaft 25 has an outer diameter rotatably inserted into the main body 21, and has a link stopper shaft 25a at an upper portion thereof so as to protrude through the upper lid 22.
Is formed in a shape having a smaller diameter than the main body of the camshaft 25 and a shape in which the link 3 to be fitted is prevented from rotating, for example, a rectangular shape as shown in the figure. An insertion hole 25c for inserting the twist adjustment jig J is formed so as to penetrate the link stopper shaft 25a, and a screw hole 25b for retaining the link 3 is formed in a part of the link stopper shaft 25a. And an insertion hole 2 on the lower surface side.
On the outer peripheral portion of 5c, at each required angle, a mountain-shaped or saw-tooth-shaped claw 25d that functions as a one-way clutch that can be engaged with the claw 24a of the cam 24 is formed. The claw 24a of the cam 24 and the claw 25d of the cam shaft 25 mesh with each other with respect to rotation of the cam in one direction, and do not mesh with each other when rotating in the opposite direction. To do it.

As shown in FIG. 11, the torsion spring 26 is formed by winding in a coil shape.
Of both ends 26a, 26b are bent to form engagement pieces.
6a is locked to the camshaft 25 side, and the other end 26b is locked to the spring holder 23 side.
And the torsion spring 26 is twisted. Thereby, when the link 3 rotates in response to the opening operation of the door D, the link stopper shaft 25 of the cam shaft 25 fitted to the link 3
a, the camshaft 25 is simultaneously rotated through the torsion spring 2
A biasing force for biasing the door D in the direction to close the door D via the link 3 is stored in 6. In this embodiment, when the door D is closed, the spring mechanism 2 connects the link 3 to the torsion spring 26.
The urging force for urging the door D in the closing direction is set to remain in the opening upper frame F or the door D side, and the spring mechanism 2 is moved to the door side or the upper side as described above. The urging force of the torsion spring 26 can be adjusted by an operation from the outside while being attached to the frame. And
When the door D is closed, the urging force of the torsion spring 26, which stores the urging force urging in the closing direction, is applied to the link 3 via the camshaft 25.
Is rotated, and the door D is closed using the force for returning the link 3.

Next, the order of assembling the spring mechanism 2 using the components configured as described above will be described. Body 2
The torsion spring 26 is inserted into the inside 1. At this time, one end 26a of the torsion spring is engaged with the spring retaining groove 21b on the bottom surface of the main body, and the other end 26b is engaged with the spring retaining groove 23b of the spring holder 23 that is inserted into the main body 1. The cam 24 is inserted into the cam insertion hole 23a of the spring receiver 23 via the pressing springs 27, 27.
Is inserted. In this case, the pressing spring 27 urges the cam 24 so as to always push it up, and causes the claw 25a of the cam shaft 25 fitted and supported by the upper lid 22 to mesh with the claw 24a of the cam 24. Since a camshaft insertion hole 22d having a stepped inner peripheral surface is bored in the upper lid 22, the stepped surface formed on the outer peripheral surface of the camshaft 25 is brought into contact with the camshaft insertion hole 22d.
Although the cam shaft 25 is allowed to rotate, the cam shaft 25 is prevented from coming out of the main body.

The strength of the torsion spring 26 is adjusted by increasing or decreasing the strength of the torsion spring 26 by directly rotating the spring holder 23 with the torsion adjusting jig J with the spring mechanism 2 attached. That is, when the torsion spring 26 is strengthened, the distal end portion J1 of the torsion adjusting jig J is fitted into the fitting hole 23e formed in the spring receiving member 23, and the spring receiving member 23 is cammed together with the cam 24. Is rotated directly in the twisting direction. Also,
When the torsion spring 26 is weakened, the contact piece 24d at the bottom of the insertion hole 24c of the cam 24 is pressed by a step J2 formed near the tip end J1 of the torsion adjusting jig J. And the claws 24a and 25d of the cam shaft 25 are disengaged from each other, and the spring holder 23 is rotated in the reverse direction.

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. When the door D is closed, the link 3 is completely immersed in the gap G and is outside the door D. In the form of a thin thin plate so as not to be exposed. Further, one end of the link 3 is
As shown in the figure, a rectangular hole 31 is formed for fitting and locking to the rectangular link stopper shafts 25a, 27a at the upper end of the cam shaft 25 or the link shaft 27, and the other end is provided with 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 is attached.

Next, the operation of the above automatic door closing device will be described. When the door D is opened, the link 3 locked on the spring mechanism 2 fixed to the upper portion of the door or the upper frame rotates following the operation thereof around the cam shaft 25 and locks the tip of the link 3. Movable stopper (sliding body) 16
Moves in the guide 1B according to the rotation of the link 3.
At this time, the piston 1P also moves in the cylinder 10 of the air damper member 1A to the side opposite to the plug 11 (to the right in FIG. 3) via the piston rod 12 to which the movable stopper 16 is fixed. When the piston 1P moves, 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 moved from the opened air passage. Cylinder 1
The air is sucked into the space 0, and the movement of the piston 1P and the movable stopper 16 is performed lightly.

At the position where the stopper is opened to the set full opening angle, the stopper movable body 1 is moved to the state shown in FIGS.
6 moves, the hook-shaped engaging member 16 a of the stopper movable body 16 is moved by the inclined surface 18 of the hook portion of the stopper cam 18.
Slide with a. As a result, the stopper cam 18 retreats along the elongated hole 1H against the spring S2, and its distal end is temporarily pushed up against the spring S1 to pass through the hook portion of the stopper cam 18. At about 11
When the stopper cam 18 is released to about 0 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 (90).
Degree).

Next, when closing the door D from the open state,
When the door D is pulled or pushed in the closing direction, the door D
Of the stopper pushes the movable stopper 16 through the link 3, and the hook-shaped engaging member 16 of the movable stopper 16 is moved.
a pushes up the hook portion of the stopper cam 18 again against the spring S2, the engaging piece 16a is disengaged 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. 16, the piston rod 12 and the piston 1P are moved in the direction opposite to the direction when the door is opened. When the stopper between the stopper movable body 16 and the stopper cam 18 is released, the force of the torsion spring 26 of the spring mechanism 2 that is twisted when the door is opened acts, and the link shaft 22 is forcibly rotated. 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 a direction to be closed by the torsion spring 26. I do.

When the piston 1P moves toward the stopper 11 in the cylinder 10 by swinging in the direction in which the door D is closed, the ball valve 13 causes the pressure of the spring S and the air of the air damper member head side sealed to be closed. Since the air passage is closed by being pressed to the valve seat side by the compression force, the closed cylinder 1
The air inside 0 is compressed. When the door D starts to close, the compression rate of the air in the cylinder 10 is low, so that the moving speed of the piston is fast. However, the air pressure in the cylinder 10 increases with the movement of the piston. The gradually increasing pressure of the compressed air in this manner causes a state in which the movement of the piston 1P is braked, and the speed at which the door D is closed gradually decreases. However, the door D is securely closed by the action of the torsion spring 26.

In the automatic door closing device, only the link 3 is exposed to the outside of the door D. 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 upper frame F of the opening, the automatic closing device for the door is invisible from the outside.

Although the embodiment of the automatic door closing apparatus of the present invention has been described above, the function and effect can be achieved even if the air in the cylinder when the door is closed slightly leaks. The closing speed of the door can be adjusted by adjusting the amount of the leakage.

[0041]

According to the automatic door closing device of the present invention, at the time of opening the door, the piston of the air damper member can be moved with a low load via the link, and the door can be opened easily. During the closing operation of the door, the air in the cylinder is compressed by the piston moving in the return direction, and the movement resistance of the piston is gradually increased. The door can be closed securely while preventing injuries such as finger stuffing, etc., and the use of an air damper member makes the structure of the automatic closing mechanism compact and easy to manufacture. It can be attached to either the upper frame or the door side, and when the door is closed, the automatic closing device can not be seen at all from the outside, making it possible to make the appearance of the door clear. That. Also, the torsional force of the spring mechanism
Since the jig can be inserted into the spring mechanism body from the top of the door or from the outside of the body buried and fixed in the upper opening frame, the jig can be adjusted, so that the door closing force can be adjusted before or after the door is installed. Can be easily performed, the door can always be closed with a closing force suitable for each door, and the biasing force of the torsion spring can be increased or decreased after the automatic closing device is installed. When mounting to doors, etc., if the torsion spring is weakened and installed, the installation can be performed easily and easily adjusted to the required biasing force after installation, and all doors can be properly adjusted. Can be closed. And
In particular, when the torsion spring is strengthened, the spring holder can be directly rotated together with the cam, thereby preventing the cam from being twisted by the jig for adjusting the twist of the cam and keeping the movement of the cam smooth. When the torsion spring is weakened, the cam and the camshaft are disengaged by pressing the contact piece of the cam insertion hole by the step formed near the tip of the twist adjusting jig. The spring holder can be rotated in the reverse direction.

Further, the piston of the air damper member is formed with a conduction hole through which air is conducted, a valve seat surface formed on the open end surface of the conduction hole, and a ball valve which is urged and seated on the valve seat surface. In addition, when the door is opened and closed, the movement of the ball valve can reliably restrict the flow rate of air in one direction, thereby improving the operation reliability.

Further, by providing a stopper mechanism in the automatic door closing mechanism, even if a stopper device is not provided outside,
The door can be kept open only by opening and closing the door.

[Brief description of the drawings]

FIG. 1 is a plan view showing an open / closed state of a door to which an embodiment of the automatic door closing device of the present invention is attached.

FIG. 2 is a front view showing the open / closed state of the door equipped with the automatic closing device for the door, wherein FIG.
(B) is a front view showing the state where the door was completely closed.

FIG. 3 shows an embodiment of an automatic closing device for the door, (A)
Is a cross-sectional view showing the automatic closing mechanism in a state where the door is completely closed, (B) is a cross-sectional view showing the automatic closing mechanism in a state immediately before the door is completely opened, and (C) is a state in which the door is completely opened. It is sectional drawing which shows the automatic closing mechanism of a state.

4A and 4B show the automatic door closing mechanism, wherein FIG. 4A is a sectional view of an air damper member, FIG. 4B is a sectional view of a guide section, and FIG. 4C is a plan view of the guide section.

5A and 5B show a stopper movable body, and FIG.
(B) is a sectional view.

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

7A and 7B show a link, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a bottom view.

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

9A and 9B show a cam, wherein FIG. 9A is a plan view, FIG. 9B is a partially cutaway front view, FIG. 9C is a bottom view, and FIG. 9D is a side view.

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

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

[Explanation of symbols]

 D Door F Opening upper frame 1 Automatic closing mechanism 1A Air damper member 1B Guide 1C Joint 1P Piston 1S Stopper mechanism 10 Cylinder 12 Piston rod 16 Stopper movable body (sliding body) 18 Stopper cam 2 Spring mechanism 21 Main body 22 Upper lid 23 Spring receiver 23e Fitting hole 24 Cam 24c Insertion hole 24d Contact piece 25 Cam shaft 25c Insertion hole 26 Torsion spring 3 Link

Claims (3)

[Claims] 1. An automatic door closing mechanism which is provided between a door and an upper frame of an opening and moves along with the opening and closing of the door, and an automatic door closing mechanism arranged on an upper portion of the door or on an upper frame of the opening. Is a guide along the upper part of the door or the upper frame of the opening, a sliding body connected to one end of the link, and sliding in the guide according to the opening and closing of the door,
While limiting the flow rate of air in one direction, an air damper member that adjusts the speed at the time of closing the door by air pressure generated in the cylinder, and one end fixed to the piston of the air damper member,
In a door automatic closing device including a piston rod having the other end fixed to a sliding body and a spring mechanism for urging the door in a closing direction, a torsion spring including a spring mechanism in a cylindrical main body; A torsion spring can be adjusted to be twisted from the outside, and a cam that acts as a one-way clutch and a cam shaft that meshes with the one-way clutch and that fixes the link are housed in the camshaft and the cam. An insertion hole for inserting a predetermined twist adjustment jig is formed through the cam shaft and the cam, and a fitting hole is formed in the spring receiver so that the tip of the jig is rotatably fitted. And a contact piece which is pressed by a step formed near the tip of the jig in the insertion hole of the cam. 2. A communication hole communicating with the piston of the air damper member between the inside and the outside of the cylinder to allow air to flow, a valve seat surface formed at an opening end face of the communication hole, and seated by being biased by the valve seat surface. The automatic closing device for a door according to claim 1, wherein a ball valve is formed. 3. The automatic door closing mechanism according to claim 1, further comprising a stopper mechanism comprising a stopper cam provided on the guide side so as to be swingable and a stopper movable body provided on the sliding body side. Automatic door closing device as described.