JP3000553U - Sliding door brake - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In a sliding door braking device that uses an air cylinder, dust does not adhere to the air adjustment valve.
Also, to provide a braking device that does not lose its braking function due to running out of oil. [Arrangement] An auxiliary circuit 14 is provided outside the cylinder 11, and the auxiliary circuit is provided with a rod cover 15 and a head cover 16.
Connected to the air holes 19 and 20 formed in the above, and the air in the air chamber 21 accompanying the expansion and contraction movement of the piston rod 13 is circulated through the auxiliary circuit, and an air adjusting valve is attached to the air hole provided in the head cover. is doing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a braking device for a sliding door that is suspended from an upper rail to open and close.

[0002]

[Prior art]

 FIG. 2 shows a sliding door device, and the sliding door 1 is suspended on an upper rail 3 by suspending tools 2, 2 attached to the upper end thereof. A roller is pivotally supported by the hanging tool 2, and the sliding door 1 can be opened and closed by rolling the upper rail 3. Reference numeral 4 in the same figure is a self-closing device, which has a spring spring built therein and always applies a spring force for winding the wire 5. Therefore, if the tip of the wire is not attached to the hanger 2, the sliding door 1 will be pulled by the wire 5 to close the doorway.

Reference numeral 6 in the figure denotes a braking device composed of an air cylinder. The rod 7 of the air cylinder 6 extends, but when the sliding door 1 is closed, it is attached to the above-mentioned hanging tool 2 by 8 mm. Contacts the tip of the rod 7 and retracts the rod 7. When the rod 7 retracts, the air in the cylinder flows through the small nozzle, so that the closing speed of the sliding door 1 is suppressed and the sliding door 1 is closed gently. The nozzle is provided on the head cover of the air cylinder. On the contrary, when the sliding door 1 is opened, the rod 7 is extended by being pulled by the magnet provided at the hitter 8 and the rod 7 extends. In this case, the air in the cylinder flows out from the rod hole formed in the rod cover. . That is, the rod hole is relatively large so that the air in the cylinder flows out leaving a gap between the rod hole and the rod.

By the way, the conventional air cylinder has a seal in which oil is impregnated in the piston, and the oil forms a film between the inner surface of the cylinder and the outer circumference of the piston to prevent air leakage. ing. However, the above oil leaks from the cylinder through the gap of the rod hole as the piston rod repeatedly projects, the oil contained in the seal gradually decreases, and the oil film between the cylinder and piston is cut off. Sometimes. As a result, air flows out from the gap between the cylinder and piston, losing the braking function and shortening the life of the air cylinder.

On the other hand, the air vent valve (nozzle) provided at the tip of the cylinder has a structure in which the size of the air port can be adjusted. However, since the nozzle is exposed to the outside, dust adheres to the air port. It may interfere with the outflow of air. Therefore, in this case, the piston rod is not sufficiently contracted, and as a result, the sliding door cannot be completely closed.

[0006]

[Problems to be solved by the present invention]

 As described above, the conventional braking device has the above problems. The problems to be solved by the present invention are these problems. The air cylinder, which is a braking device, operates properly to quietly close the sliding door, and the air cylinder has a long life and high durability. Provide a device.

[0007]

[Means for Solving the Problems]

 The braking device of the present invention is configured to solve the above problems, and an auxiliary circuit is provided in an air cylinder that is a damper. The auxiliary circuit is provided between the rod cover of the air cylinder and the head cover, and is connected to an air hole communicating with the air chamber. The auxiliary circuit is provided with a tube or a tube so that the air in the air chamber flows. Made of tube. A regulating valve is arranged in the air hole formed in the head cover to regulate the outflow amount of air from the air chamber. In addition, the rod hole formed in the rod cover is provided with bearings and seals so that no gap is left between it and the piston rod.

[0008]

[Action]

 By the way, when the sliding door is closed, the abutment attached to the hanger of the sliding door comes into contact with the receiver at the tip of the piston rod of the air cylinder to retract and compress the piston rod. Then, the air in the air chamber is pushed by the piston, flows out from the air port on the head cover side, passes through the adjusting valve provided in the air hole, and flows to the auxiliary circuit. From the auxiliary circuit, the air hole on the rod cover side to the air chamber. Pour in. Therefore, there is no inflow or outflow of external air, and no dust adheres to the regulating valve. In addition, since the rod hole formed in the rod cover does not leave a gap with the piston rod, oil does not leak. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0009]

【Example】

 FIG. 1 shows an embodiment of a braking device according to the present invention, and the braking device comprises an air cylinder as is apparent from the drawing. In the figure, 11 is a cylinder, 12 is a piston, 13 is a piston rod, and 14 is an auxiliary circuit. A rod cover 15 and a head cover 16 are provided at both ends of the cylinder 11, the piston 12 reciprocally slides in the cylinder 11, and a piston rod 13 protruding from the rod cover 15 expands and contracts together with the piston 12. Further, at the tip of the piston rod 13, there is provided a receiver 17 with which the contact attached to the suspender comes into contact, and a urethane piece 18 is fixed to the front end of the receiver 17.

The auxiliary circuit 14 is made of a vinyl tube, a copper tube, or the like, and is configured to allow air to flow. Both ends of the auxiliary circuit 14 are connected to the rod cover 15 and the head cover 16, and the air holes 19 and 20 are provided. It is in communication. The air holes 19 and 20 communicate with the air chamber 21 of the cylinder 11. An air adjusting valve is attached to the air hole 20 formed in the head cover 16, and the adjusting valve is composed of a needle 23 having a knob 22, and the needle 23 is fitted in the air hole 20. Then, the knob 23 can be rotated to move the needle 23 in and out to adjust the amount of outflow of air, and the lock nut 24 is fixed at a predetermined position.

Although the piston rod 13 is in the most retracted state in FIG. 1, when the hit provided on the hanging member of the sliding door abuts on the receiver 17, the piston rod 13 has to project and extend largely. However, when the projecting piston rod 13 retracts, the air in the air chamber 21 enters the air hole 20 through the air port, flows through the auxiliary circuit 14, and again from the air hole 19 on the rod cover 15 side to the air chamber 21 of the cylinder 11. Go to. That is, the air flowing out from the air chamber 21 flows through the auxiliary circuit 14 and returns to the air chamber 21 so as to circulate. On the contrary, when the piston rod projects, on the contrary, it flows out from the air hole 19 to flow through the auxiliary circuit 14, and then returns from the air hole 20 to the air chamber 21.

Here, the piston rod 13 projects from the rod cover 15, but a hole formed in the rod cover 15 has a bearing 25 and a seal 26 is provided between the piston rod 13 and the piston rod 13. There is no gap, and the oil attached to the piston rod 13 does not leak out. There is a certain amount of clearance on the outer circumference of the piston rod 13 in order to connect the air hole 19 and the air chamber 21. As described above, the braking device of the present invention is provided with the auxiliary circuit in the air cylinder and the air is circulated through the auxiliary circuit, and the following effects can be obtained.

[0013]

[Effect of device]

 The braking device of the present invention has an auxiliary circuit, and the air accompanying the expansion and contraction of the piston rod does not flow out or inflow from the outside, and the air circulates through the auxiliary circuit. Therefore, the phenomenon that the foreign dust enters and adheres to the adjusting valve to prevent the air from flowing out, the piston rod does not move backward, and the sliding door cannot be completely closed is eliminated. Also, dust does not adhere to the piston and wear the cylinder. Of course, the oil does not leak due to the protrusion of the piston rod, and the braking function is not lost due to the oil shortage between the piston and cylinder.

[Brief description of drawings]

FIG. 1 is an embodiment showing a braking device of the present invention.

FIG. 2 is a sliding door device.

[Explanation of symbols]

 11 Cylinder 12 Piston 13 Piston rod 14 Auxiliary circuit 15 Rod cover 16 Head cover 17 Receiver 18 Urethane piece 19 Air hole 20 Air hole 21 Air chamber 22 Knob 23 Needle 24 Lock nut 25 Bearing 26 Seal

Claims (1)

[Scope of utility model registration request] 1. A braking device for a sliding door using an air cylinder, wherein an auxiliary circuit is provided outside the cylinder, and the auxiliary circuit is formed between the rod cover and the head cover of the cylinder to form the head cover and the rod cover. A braking device for a sliding door, which is connected to an air hole, the air hole communicates with an air chamber of a cylinder, and an air regulating valve is provided in the air hole of the head cover.