JPH0245415Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a door closing device for sliding doors, and more specifically, in a door closing device that secures the closing force using a spring or weight, etc., this invention uses a hydraulic cylinder to control the speed when closing the door. This is what I did.

In door closing devices for sliding doors that secure the door closing force using springs, weights, etc. and automatically close when the sliding door is released from the fully open position, conventionally, in order to control the speed during the closing operation, Some have been provided that utilize pneumatic cylinders. However, with the method of using air pressure, it is difficult to control the speed to ensure smooth movement due to its compressibility, and it is especially difficult to control the speed immediately after the hand is released. There were problems with these facilities, such as making users feel uneasy and sometimes leading to accidents.

This idea aims to solve the above-mentioned problem by using a hydraulic cylinder instead of a pneumatic cylinder, and in a door closing device for sliding doors that uses springs, weights, etc. to secure the door closing force, A hydraulic cylinder with a double structure cylinder tube is used for speed control, and the interior of the inner cylinder tube where the piston rod operates is divided into chamber A and chamber B separated by the piston, and the inner cylinder tube and outer cylinder tube are divided into chambers A and B. The space between them is room C,
The A and C chambers and the B and C chambers are communicated through two flow paths each, a flow path having a check ball valve interposed therein and a flow path having a flow rate restricting valve interposed therebetween, and Two side holes are provided at intervals in the circumferential wall of the internal cylinder tube so that chambers A, B, and C communicate with each other depending on the piston position. Chambers A and C and chambers B and C communicate with each other only through the flow restrictor valves to allow pressurized oil to flow. The door closing speed of the delayed section and the buffer section within these sections can be adjusted by the above-mentioned flow throttle valve, and the check ball valve is manually operated against the spring in the delayed section and the buffer section. The object of the present invention is to provide a door closing device for a sliding door characterized in that, by opening the door, the door can be closed at a speed faster than the speed set by the flow rate restricting valve.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

In the embodiments shown in FIGS. 1 to 7, a hydraulic cylinder for speed control is incorporated into a door closing device for a sliding door that secures the door closing force using a tension spring.

In the sliding door device shown in Fig. 1, 1 is a sliding door, 2 is a sliding door;
3 is a hanging door wheel plate attached at intervals to the upper end of the sliding door 1; 3 is a wheel rotatably pivoted on the hanging door wheel plate 2;
4 is a rail that guides the wheels 3 in a freely rolling manner; 5 is a door closing device installed above the closing side of the door 1;
One end of the tension spring 7 is connected to the head cover section 6a at one end of the speed control cylinder 6 installed at a fixed position, and the tip of the rod 8 protruding from the rod cover section 6b at the other end of the cylinder 6 and the other end of the tension spring 7 are connected. The lower end of the metal fitting 9 is connected to the hanging door wheel plate 2 on the door opening side. In the sliding door device described above, the sliding door 1 is manually moved to the open position in the direction of arrow X from the fully closed position shown in FIG. The cylinder 6 for speed control is moved in the closing direction by the tension spring 7, and the speed control cylinder 6 is moved in the closing direction by the tension spring 7.
As shown in FIG. 2, from the fully open position to the fully closed position, there is a delayed section in which the sliding door 1 gradually operates in the closing direction, a high speed section in which the sliding door 1 operates at high speed by the tension spring 7, and a gradual closing operation near the fully closed position. Control is divided into buffer sections.

The structure of the speed control cylinder 6 includes valve bodies 10 and 11 for controlling the flow rate and flow incorporated into the head cover part 6a and rod cover part 6b forming both ends of the cylinder 6. A small diameter inner cylinder tube 12 and an outer cylinder tube 13 surrounding the inner cylinder tube 12 at a distance are provided between the head cover section 6a and the rod cover section 6b. A piston 14 is slidably fitted into the internal cylinder tube 12, which is integrally formed with the tip of a rod 8 that slides through the rod cover portion 6b. The inside of the internal cylinder tube 12 is partitioned by a piston 14 into a chamber A on the side where the door is closed and a chamber B on the side where the door is open.
Room C is between the two. Two side holes 1 are provided at intervals in the peripheral wall of the internal cylinder tube 12.
5 and 16 are provided to appropriately communicate the C chamber, A chamber, and B chamber. In addition, the operating valve body 10 has two passages 17 and 1 that communicate the tips of the A chamber and the C chamber.
A flow rate restricting valve 19 is provided in the passage 17, and a check ball valve 21 biased by a spring 20 is provided in the passage 18.
Distribution to room A is possible, but distribution from room C to room A is not allowed. Similarly, the operating valve body 11 is provided with two passages 22 and 23 that communicate the B chamber and the C chamber,
A flow rate restricting valve 24 is provided in the passage 22, and a check ball valve 26 biased by a spring 25 is provided in the passage 23, and the check ball valve 25 allows flow from the C chamber to the B chamber. Distribution from room B to room C is not allowed.

Furthermore, a passage 27 is provided in the piston 14 that communicates the A chamber and the B chamber, and a check ball valve 29 biased by a spring 28 is interposed in the passage 27, so that the flow from the B chamber to the A chamber is possible. Therefore, distribution from room A to room B is not allowed.

In the figure, 30 is a gasket that keeps oil tight between chambers A and C, 31 is a gasket that keeps oil tight between chambers B and C, and 3
2 is the gasket that keeps rooms A and C oil-tight, 33 and 3
4 is a gasket that maintains oil tightness between chamber C and the outside.

In the hydraulic cylinder 6 having the above structure, as shown in FIG. 4, the A and B chambers are filled with control oil O.
Air a is sealed in the upper part of chamber C, and the air a
has the role of absorbing changes in oil volume due to temperature changes and changes in oil level equivalent to the rod volume when the rod 8 moves in and out, with a small change in air pressure.

Next, the operation of the door closing device having the above configuration will be explained.

FIG. 3 shows the sliding door 1 in the fully closed position, in which the piston 14 is at the left end position in the figure (door closed side).
It is in.

When the sliding door 1 is manually pulled in the opening direction of the X direction from the above-mentioned fully closed state, the piston 14 is moved to the right, and the oil in the B chamber opens the check ball valve 29 and flows into the A chamber, so that the piston 14 moves to the right without resistance.
This is the manual opening process, and the sliding door 1 shown in Figure 5
becomes fully open.

When the sliding door 1 is released in the fully open state, the spring 7 causes the sliding door 1 to move in the closing direction in the Y direction, and the piston 14 also moves to the left. At this time, the oil in the A chamber flows through the side holes 15 and 16 into the C
It is in a state where it can flow into the chamber without much resistance. On the other hand, since the pressure in chamber B becomes negative, oil tries to flow from chamber C to chamber B through passage 23, but check ball valve 26 is restricted by spring 25 so that it does not operate during normal automatic closing operation. Therefore, it flows from the C chamber to the B chamber only through a slight gap in the flow rate restricting valve 24 on the passage 22 side. That is, by adjusting the throttle valve 24, the oil flow from the C chamber to the B chamber is gradually passed through while being throttled by the gap between the throttle valves 24, so that until the piston 14 passes through the side hole 15,
In this state, gradually continue moving to the left. This piston 1
The section from the right end position to the side hole 15 is the delayed section. At this time, when the sliding door 1 is manually moved in the closing direction and the piston 14 is forced to move to the left, the check ball valve 26 opens against the spring 25, and oil flows from the C chamber to the B chamber. However, the piston 14 can move to the left with slight resistance.

The state shown in FIG. 6 in which the piston 14 has passed through the side hole 15 is immediately after entering the high speed section. After the piston 14 passes through the side hole 15 and until the side hole 16 is closed, the oil in the A chamber is mainly drained into the side hole 1.
The piston 14 continues to move to the left at a high speed because the piston 14 flows out from the side hole 15 into the B chamber and flows into the B chamber from the side hole 15. This section is the high-speed section.
Note that the speed cannot be adjusted in this section, and the closing speed of the sliding door 1 depends on the amount of oil flowing into the B room side from the side hole 15, the throttling condition of the throttle valve 24, or the oil flow from the side hole 16 into the A room side. It is determined by the outflow amount and the degree of restriction of the throttle valve 19.

The state shown in FIG. 7 in which the piston 14 has passed through the side hole 16 is immediately after entering the buffer zone. After the piston 14 passes through the side hole 16, A
The oil in the room tries to flow out to room C through the passages 17 and 18, but since the check ball valve 21 is restricted by the spring 20 so that it does not operate during the normal automatic closing operation, there is no escape route for a moment, and the oil flows into room A. Since the internal pressure of the piston 14 is increased and resists the leftward movement of the piston 14, the leftward movement speed of the piston 14 decreases. Piston 14
The buffer section is the section from when it passes through the side hole 16 until it returns to the fully closed state shown in FIG. In addition, when the sliding door is manually closed in the buffer section and the piston 14 is forced to move to the left, the check ball valve 21 works against the spring 20, so the oil in the A chamber side flows into the C chamber. Because it flows to
The piston 14 moves to the left without resistance.

As described above, in the left stroke of the piston 14 in the closing direction, the first delayed section is slow, the middle high speed section is fast, and the final buffer section is slow. It closes quickly in the middle and slowly at the end. The speed adjustment of the above-mentioned delayed section and buffer section is performed by the flow rate restrictor 1.
By adjusting the degree of constriction of 9 and 24, the amount can be increased or decreased as desired.

Note that this invention is not limited to the above-mentioned embodiment, but also eliminates the side hole 15 provided in the internal cylinder tube 12 on the door opening side, makes the passage 22 that communicates the C chamber and the B chamber large in diameter, and If the amount of restriction of the flow rate restricting valve 24 interposed in the passage 22 is reduced and the amount of oil in the A chamber flowing from the side hole 16 to the C chamber to the passage 22 to the B chamber is increased, as shown in FIG. It is also possible to use the section from the fully open state to the side hole 16 shown in FIG. 7 as a high-speed section. in this case,
The speed in this high-speed section can also be adjusted by the flow rate restrictor 24, and the sliding door 1 operates as shown in FIG.

Further, in the above embodiment, the door closing force is secured by the tension spring 7, but as shown in FIG. 9, instead of the spring, a weight 40, a wire 41, a pulley
A combination of these may also be used. Furthermore, the first
In the embodiments shown in FIGS. 7 to 7, the spring is attached outside the cylinder, but it goes without saying that it may be incorporated inside the cylinder, and a liquid other than oil can be used as the operating liquid.

As is clear from the above explanation, according to the sliding door closing device of this invention, a piston is fitted as a cylinder for speed control when closing the door in a door closing device that secures door closing force using a spring or weight. A double-structured hydraulic cylinder consisting of an inner cylinder tube and an outer cylinder tube is used, and a flow rate is applied to a passage communicating between both chambers partitioned by a piston in the inner tube and a chamber between the inner tube and the outer tube. By providing a throttle valve and a check ball valve and controlling the flow direction and amount of pressure oil, the door closing stroke can be operated in a delayed section, a high speed section, and a buffer section. Furthermore, since the closing operation is controlled using hydraulic pressure, the operation can be performed smoothly and safety is improved. Further, the speeds of the delayed section and the buffer section can be adjusted very easily by adjusting the flow rate restricting valve.
Furthermore, in these delayed sections and buffer sections, when it is desired to operate at a speed different from the automatic speed controlled by the flow restrictor, for example, at a faster speed, the check ball valve is opened against the spring by manual operation. This has various advantages such as being able to easily close the door at a faster speed different from the set speed.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a sliding door equipped with a door closing device according to this invention, Fig. 2 is a drawing showing the opening/closing operation process of the sliding door, Fig. 3 is a sectional view of the speed control cylinder when it is fully closed, and Fig. 4 The figure is a sectional view taken along the - line in Fig. 3, Fig. 5 is a sectional view of the cylinder at full throttle, Fig. 6 is a sectional view of the cylinder in the high-speed section immediately after the delayed section, and Fig. 7 is a sectional view of the cylinder in the high-speed section immediately after the high-speed section. FIG. 8 is a cross-sectional view of the cylinder when the door is opened, FIG. 8 is a drawing showing the opening/closing operation process of a modified example of this invention, and FIG. 9 is a drawing showing a modified example in which the door closing force is secured by a weight. 1... Sliding door, 5... Door closing device, 6... Speed control cylinder, 7... Tension spring, 8... Rod,
12...Inner cylinder tube, 13...Outer cylinder tube, 14...Piston, 15, 16
... Side hole, 17, 18, 22, 23 ... Passage, 1
9, 24...Flow rate restrictor valve, 21, 26, 29...
Check ball valve.

Claims (1)

[Scope of utility model registration request] In a door closing device that connects a spring, weight, etc. to a metal fitting attached to a sliding door to bias the sliding door toward the closing side and secure the door closing force, an internal cylinder tube into which a piston is fitted and an internal cylinder tube surrounded by the internal cylinder tube are used. A double-structured hydraulic cylinder for speed control consisting of an external cylinder tube is provided, and the rod connected to the piston is connected to the sliding door via a metal fitting, while the left and right cylinders in the internal cylinder tube partitioned by the piston are connected to the sliding door via a metal fitting. The chamber and the chamber between the inner cylinder tube and the outer cylinder tube are connected to a passageway with flow rate restricting valves provided in the valve bodies on both sides of the cylinder, and a check ball valve biased by a spring. A delayed section in which oil flows only through the flow rate restricting valve from the fully open position to the fully closed position of the door closing operation section, which communicates with the passageway and through a side hole provided in the peripheral wall of the internal cylinder tube. and,
It is configured to operate separately into a high-speed section in which the flow flows through the side hole and a buffer section in which the flow flows only through the flow restrictor valve.Furthermore, in the delayed section and the buffer section, the non-return ball is manually operated against the spring. A door closing device for a sliding door, characterized in that, by opening a valve, the door can be closed at a speed faster than the speed set by the flow rate restricting valve.