JPH08184252A - Automatic closing device for double sliding door - Google Patents

Abstract

PURPOSE: To provide a device of a simple construction in which spring forces can be easily adjusted and improved weather resistance can be provided without causing a lowering of cushioning action and sounds of air leak in a device provided with a pneumatic pressure cushion, in relation to an automatic closing device of a double sliding door. CONSTITUTION: In an automatic closing device of a double sliding door wherein a return spring 14 is mounted between an outer cylinder 1 and an end 17 of a pipe 9 which is inserted into the cylinder 1, and a flexible cup-shaped piston 12 is provided at an end of the pipe 9 and a regulating valve 7 is provided to adjust the flow of air compressed by the piston 12, a threaded rod 18 in an extending direction of the spring 14 is rotatably inserted into the end 4 of the cylinder 1 or into the end 17 of the pipe 9. A spring receiver 24 is brought into threaded engagement with the rod 18 in a free state and an end of the spring 14 is engaged with the threads of the receiver 24. An insertion groove 27 for a driver or a grip is provided at a projected end of the rod 18 to rotate the rod 18. Returning forces of the door can be adjusted by rotating the rod 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding door automatic closing device, and more particularly to a device having a pneumatic cushion for returning an opened door by the force of a spring.

[0002]

2. Description of the Related Art When a sliding door is opened, a device for automatically closing the door by the restoring force of a spring deformed by the opening operation is known. In addition to the above-mentioned ones that use the return force of the spring, there are also ones that use a weight or an electric drive device, but those that use the return force of the spring are simple and compact. The advantage is that no additional work such as electrical wiring is required.

An automatic closing device utilizing the restoring force of a spring is
A tension coil spring is usually used as a spring, and a damper is usually provided by using a pneumatic cushion in order to prevent the door from being gradually accelerated by the spring and being shockedly closed. FIG. 4 shows an example of a typical structure of a conventional device of this type. The pipe 9 is axially movably inserted through the outer cylinder 1 with a gap 11 between the return spring 14 and the pipe 9. Connect the ends to the end 4 of the outer cylinder and the end 17 of the pipe.
And a piston 33 for fixing a gap between the outer cylinder and the pipe to the tip of the pipe 9. A check valve 34 for guiding outside air into the outer cylinder 1 is provided at the end portion 4 of the outer cylinder, and the outer cylinder 1
A needle valve 7 for limiting the outflow amount of air from the inside is provided.

In the automatic closing device of this kind of structure, the outer cylinder 1 is usually fixed in the groove of the upper frame for guiding the upper side of the sliding door, and the end of the pipe 9 is fixed to the sliding door via the bracket 23. Fix it. When the door is opened, the opening operation pulls the pipe 9 axially from the outer cylinder 1, and at the same time, the spring 14 is also stretched. At this time, the piston 33 moves to the right in the figure, and the check valve 34 is placed in the space created by the backward movement of the piston.
Outside air is inhaled through the. When the hand is released from the opened door, the door starts to move in the closing direction by the restoring force of the spring 14. With this return operation, the piston 33 provided at the tip of the pipe
Compress the air introduced into the space between the end 4 of the outer cylinder and the piston 33. The check valve 34 does not allow the air in this cavity to flow out, so that the compressed air flows out through the needle valve 7. Therefore, by adjusting the opening degree of the needle valve 7, the return speed of the door can be adjusted and the door can be closed quietly.

[0005]

The automatic closing device utilizing the restoring force of the spring 14 increases the force of the spring 14 when the force of the spring 14 is increased.
Because of the extra force required to open the door, the spring 14
It is necessary to set the return force of the to the minimum necessary force. Also, in order to close the door smoothly with a small spring force,
It is necessary to mount the automatic closing device so that the upper frame and the lower frame for guiding the door are arranged with accurate parallelism and straightness, and the guide direction thereof and the moving direction of the pipe 9 are correctly aligned.

However, even if the above construction is accurately performed when constructing a building, the building is often deformed due to secular change, causing an error in the positional relationship among the above-mentioned members. This error appears as resistance when the door is opened and closed, and the door that was smoothly closed at the time of new construction stops on the way and does not close. Occurrence of poor closing due to such deformation of the building has been the biggest problem of the automatic closing device using the restoring force of the spring.

One way to solve this problem is to allow the spring force of the closing device to increase when the sliding resistance of the door increases. For example, the actual Kaisho 58-1
No. 20376 discloses a sliding door in which one end of a spring that closes a door is fixed to an adjusting screw via a cord body, and the cord body is wound around the adjusting screw so that the restoring force of the spring can be increased. An automatic closing device has been proposed.

However, a big problem of the device in which the spring force is adjustable is that the structure becomes complicated. In order to make the spring force adjustable, the adjusting mechanism must be located at the end of the spring. To prevent the moving parts from appearing to the outside as much as possible and to prevent dust from entering the device, insert a pipe slidably into the outer cylinder,
The most rational structure is shown in FIG. 4 in which the spring 14 is housed in the pipe. However, in the case of this structure, the end portion 4 of the outer cylinder fixing the both ends of the spring 14 and the end portion 17 of the pipe are part of the partition wall forming the air chamber of the air compressed by the piston 33. Therefore, it must have an airtight structure. Therefore, it is impossible to use the spring force adjusting mechanism as shown in the above-mentioned publication for the spring installed in the pipe 9, and as disclosed in the above-mentioned publication, the adjustable spring is the outer cylinder. Since it has to be placed outside, the structure of the device becomes complicated, and since the moving parts are exposed to the outside, there is a problem of dust entering the moving parts, which is disadvantageous in terms of maintenance and weather resistance. is there.

Further, as shown in FIG. 4, in the structure in which the check valve 34 is provided in order to prevent the air compressed by the piston 33 from leaking, a certain amount of air flow occurs around the valve body, or to a certain extent. Check valve 3 if no pressure difference occurs
4 does not close, and therefore the check valve 34 is not closed until the check valve 34 is completely closed after the piston 33 starts to return.
There was a problem in that the air flow that flows backwards generated noise, which was very annoying.

The present invention has been made in order to solve the problems of the above-mentioned conventional device, and the gap 1 is formed in the outer cylinder 1.
1, a pipe 9 is inserted between the pipes 1, and a return spring 14 is installed in the pipe between the end 4 of the outer cylinder and the end 17 of the pipe, and the gap 11 is provided at the tip of the pipe 9. An automatic closing device for a sliding door, which is provided with closing pistons 12 and 33 and an adjusting valve 7 that adjusts the outflow amount of air compressed by the returning operation of the pistons. When the dynamic resistance increases,
The structure is such that the spring force of the spring housed in the pipe can be easily adjusted, and thereby the cushioning action using air pressure is not impaired and the sound of air leakage does not occur. Moreover, it is an object to obtain a device having excellent weather resistance in which a spring and a movable part are not exposed to the outside.

[0011]

According to the present invention, the pipe 9 is inserted into the outer cylinder 1 with a gap 11 in between, and the return spring 14 is inserted in the pipe 9 and the end 4 of the outer cylinder and the pipe. An adjustment for mounting between the end portion 17 and the pistons 12, 33 for closing the gap 11 at the tip portion of the pipe 9 and adjusting the outflow amount of the compressed air by the returning operation of the pistons. In the automatic closing device for the sliding door provided with the valve 7, the end 4 of the outer cylinder or the pipe 9
A screw rod 18 extending in the extending direction of the return spring 14 is rotatably inserted into an end portion 17 of the spring spring 24, and a spring receiver 24 is screwed into the screw rod 18 in a free state. It is characterized in that the ends of are fitted.

The screw rod 18 is attached to the end portions 4 and 17 thereof.
And a projecting end thereof is provided with an insertion groove 27 or a knob for a driver which is used when the screw rod is rotated. Further, a seal ring 25 is provided at a penetrating portion of the screw rod 18 to prevent air from leaking through the space between the screw rod 18 and the through hole.

Further, in the apparatus of the present invention, the flexible cup-shaped piston 12 is used as a piston for compressing the air in the outer cylinder 1 when the door is returned, and the gap between the outer cylinder 1 and the pipe 9 is used. An air flow path 6 that communicates 11 with the atmosphere is provided.

[0014]

The point that the pipe 9 is pulled out from the outer cylinder 1 and the return spring 14 is stretched when the door is opened is the same as in the conventional structure shown in FIG. At this time, in the space 5 on the left side of the piston 12 in the drawing, the gap between the cup-shaped piston 12 and the outer cylinder 1 which are bent toward the diameter reduction side due to the air flow path 6, the gap 11, and the pressure difference between the air before and after the piston. The outside air flows in through the gap. Therefore, the device of the present invention does not require the check valve 34 provided in the conventional structure of FIG.

When the hand is released from the opened door, the door returns to the spring 1
It recovers due to the elastic energy stored in 4. At this time, the piston 12 compresses the air in the air chamber 5 on the left side of the piston in the figure, and the compressed air leaks out through the adjusting valve 7, so that the return speed of the pipe 9, that is, the direction of closing the door. Movement speed is adjusted. This action is similar to that of the conventional structure shown in FIG. However, since the check valve 34 is not provided, the air noise generated when the check valve 34 flows backward does not occur.

The restoring force of the door can be adjusted by inserting a driver into the insertion groove 27 and rotating the screw rod 18, or by providing a knob at the base end of the screw rod 18 and rotating the knob. When the sliding resistance of the door is small, the screw rod 18 is turned counterclockwise (when the screw rod 18 is a right-hand screw). The spring receiver 24 is screwed into the screw rod 18 in a free state, but since the end portion of the return spring 14 is fitted to the outer periphery of the spring receiver 24, the spring receiver 24 rotates together with the return spring 14 due to the torsional resistance. Is suppressed, and the spring receiver 24 is screwed toward the tip end side of the screw rod 18 to weaken the spring force of the return spring 14.

When the resistance of the sliding door increases due to the aging of the building and the sliding door does not completely close automatically, the screw rod 18 is rotated clockwise. As a result, the spring receiver 24 is screwed toward the base end side of the screw rod 18, and the spring force of the return spring 14 is increased. If you increase the spring force and the door closes too fast,
The return speed is adjusted by squeezing the adjusting valve 7.

The air chamber 5 on the left side of the piston 12 in the figure
Is connected to the end 17 of the pipe passing through the threaded rod 18 through the pipe 9. The seal ring 25 prevents air from leaking from the gap between the screw rod 18 and its through hole when the air in the air chamber 5 is compressed, and ensures that the return speed is adjusted by the adjusting valve 7. I'm trying to do it. A nut member (spring holder) that is normally moved back and forth with the screw rod 18.
Although it is common sense to provide a slip key or other detent means when providing 24, in the device of the present invention, the nut member 24 is completely free and the return spring 14 fitted thereto is twisted. Since the nut member 24 is prevented from co-rotating due to the rotation resistance, the structure is very simple, and since the moving nut member 24 is provided, the problem that the diameter of the pipe 9 becomes thicker does not occur, and the spring force is prevented. By making the adjustment possible, it is possible to prevent the device structure from becoming complicated and the device from becoming large.

[0019]

1 shows an embodiment of an automatic closing device according to the present invention. The outer cylinder 1 has brackets 2 and 3 on both ends thereof.
Is fixed in the groove of the upper frame of the sliding door. One end of the outer cylinder 1 is closed by a head member 4 integrated with the bracket 3. The head member is provided with a through hole 6 for communicating the air chamber 5 in the outer cylinder 1 with the outside air, and a needle valve 7 is provided in the through hole. A guide sleeve 8 made of bearing metal or the like is fitted to the other end of the outer cylinder 1, and a pipe 9 is slidably inserted into the guide sleeve 8. A gap 11 is formed between the outer cylinder 1 and the pipe 9, and a cup-type piston 12 that closes the gap is fixed to the tip portion of the pipe 9. The cup-shaped piston 12 is made of a flexible material and is mounted toward the air chamber on the head member 4 side. A through hole 13 that communicates the gap 11 with the atmosphere is provided at the end of the outer cylinder 1 on the side opposite to the head member. Instead of the through hole 13, a gap or groove through which air can pass may be provided in the fitting portion of the guide sleeve 8.

At the center of the inner side of the head member 4, a fixed side spring receiver 15 having a thread on the outer periphery to which the coil of the return spring 14 is fitted is fixed by a screw 16. On the other hand, a cylindrical end piece 17 is fitted and fixed to the end of the pipe 9,
A screw rod 18 is rotatably inserted in the center hole of the end piece. This end piece 17 is a flange member 2
1 is integrally provided, and a bracket 23 sandwiched between the flange member 21 and the head 22 of the screw rod is fixed to a sliding door (not shown).

A return spring 14 is provided on the outer periphery of the screw rod 18.
The moving side spring bearing 24 provided with a thread to be fitted with the coil is screwed, and the return spring 14 has ends on both the outer circumferential thread of the fixed spring bearing and the outer circumferential thread of the moving side spring bearing 24. The part is fitted and mounted. No thread is cut in the part of the threaded rod 18 that penetrates the end piece 17, and an O-ring 25 is pressed against the penetrating part from the inside by a holding spring 26 that is inserted between the O-ring 25 and the moving side spring receiver 24. This O-ring 25
Prevents the air from leaking from the pipe 9 side to the outside air through the gap between the end piece 17 and the screw rod 18.

The screw rod head 22 has a screwdriver insertion groove 27.
The screw rod 18 can be rotated by inserting the tip of the drier into the groove 27 with the sliding door closed. Instead of providing the insertion groove 27, the head 22 of the screw rod
Of course, it is also possible to have a structure in which the knob is picked up and directly rotated by a finger.

The operation of the apparatus of the illustrated embodiment constructed as described above has been described in the section of the above-mentioned operation, and will be omitted here.

The seal structure for preventing the leakage of air from between the end piece 17 and the screw rod 18 is shown in FIG. 2 or FIG.
The structure shown in FIG. The structure of FIG. 2 has a screw rod 1
8 is a structure in which a groove 28 is provided in the neck portion and an O-ring 25 for sealing is fitted in the groove. The structure shown in FIG. 3 is between the back surface of the head of the screw rod 18 and the end surface of the end piece 17. It is a structure with an O-ring 25 interposed.

The screw rod 18 may be provided on the head member 4 side of the outer cylinder. Since the head member 4 is located near the vertical frame of the window or the pillar of the door, there is usually no space for inserting a driver between the head member 4 and the vertical frame or pillar. Therefore, the screw rod 18 is attached to the head member 4 of the outer cylinder.
When it is provided on the side, the structure is such that a knob, a hexagonal head, or an engaging groove is provided on the outer circumference so that the head of the screw rod 18 can be rotated from the side.

[0026]

As described above, according to the present invention, the restoring force can be adjusted when the sliding door becomes heavy due to aging deformation of the building, etc., the structure is simple, and the springs and movable parts are exposed. There is an effect that it is possible to provide an automatic closing device for a sliding door, which is excellent in maintainability and weather resistance of the structure. Further, the device of the present invention has a simple structure and is compact, does not generate air leakage noise, and does not leak cushion air, so that the return speed of the door can be adjusted accurately.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment.

FIG. 2 is a diagram showing another example of the seal structure.

FIG. 3 is a view showing still another example of the seal structure.

FIG. 4 is a sectional side view showing an example of a conventional structure.

[Explanation of symbols]

 1 Outer cylinder 4 Head member 6 Through hole 7 Needle valve 9 Pipe 12 Cup type piston 14 Return spring 17 End piece 18 Screw rod 24 Moving side spring bearing 25 O-ring 27 Insert groove

Claims (3)

[Claims] 1. A pipe (9) inserted into the outer cylinder (1) with a gap (11) interposed between the end (4) of the outer cylinder and the end (17) of the pipe. A return spring (14) located inside the pipe (9)
And a piston (12) fixed to the tip of the pipe (9) to close the gap (11), and a regulating valve (7) for regulating the outflow amount of compressed air by the returning operation of the piston.
In an automatic closing device for sliding doors equipped with and, a screw rod (18) in the direction of extension of the return spring (14) is turned around the end (4) of the outer cylinder or the end (17) of the pipe (9). It is movably inserted, the spring bearing (24) is screwed into this screw rod (18) in a free state, and the end of the return spring (14) is fitted to the thread of this spring bearing. Automatic closing device for sliding doors. 2. The screw rods (18) are attached to the ends (4, 17).
Through which the engaging portion (27) or knob for rotating the screw rod is provided.
The automatic closing device for a sliding door according to claim 1, characterized in that a seal ring (25) is provided between 8) and the through hole. 3. The air flow communicating with the atmosphere through the gap (11) between the outer cylinder (1) and the pipe (9), wherein the piston according to claim 1 is a flexible cup-shaped piston (12). Automatic sliding door closing device according to claim 1 or 2, characterized in that it is provided with a passage (6).