JPS5810865Y2 - Door closer back check device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a back-check device for a door closer, and more specifically to a device for controlling the opening rotation of a door when an abnormal load is applied in the opening direction due to wind pressure or other factors when the door is opened. It is something.

Conventionally, various types of back-check devices have been implemented, but all of the existing devices have a configuration that adjusts the flow rate of hydraulic oil, so when the temperature fluctuates, such as in summer and winter,
Since the viscosity of hydraulic oil changes with temperature changes, the oil flow rate changes, resulting in changes in the backcheck effect and variations in the backcheck angle (door opening angle), which are common drawbacks.

Therefore, the present invention was developed in view of the above-mentioned drawbacks of the conventional technology.
We replaced the conventional oil volume adjustment method with a pressure adjustment method that is unaffected by temperature changes, and by appropriately configuring a hydraulic mechanism that compresses when the door opens at a predetermined angle, the temperature can be adjusted. To obtain a back check device which aims to obtain a stable back check effect and back check angle regardless of changes, and also to be able to statically brake the opening of a door without generating an impact by gradually obtaining the above back check effect. It is something that

The drawings showing the embodiments of the present invention will be described in detail below.
First, the door closer A has a piston 5 elastically loaded with a compression spring 4 in a cylinder 3 formed by closing both left and right ends of a housing 1 with end plugs 2, 2, and a piston 5 carved into one side of the piston 5. A rack 6 is engaged with a pinion 9 which is supported by a shaft 8 in a pinion chamber 7 provided in the housing 1, and the shaft 8 is fixed to an operating arm whose one end is pivotally connected to a door mounting frame (not shown). The piston 5 is interlocked with the opening and closing of a door (not shown) to which the housing 1 is fixed, and the compression spring 4 elastically biases the piston 5 as a closing force.
Further, the head of the piston 5 is provided with a check valve 13 that allows the hydraulic oil filled in the cylinder 3 to flow from the spring chamber 10 side to the piston head chamber 12.On the other hand, the housing 1 and the peripheral wall of the piston 5 are provided with the above-mentioned A passage hole 14 that communicates the pinion chamber 7 and the piston head chamber 12, and a passage hole 14 that communicates the pinion chamber 7 and the piston head chamber 12.
0, and one of the passage holes 14 is equipped with a speed adjustment valve 16 for adjusting the opening/closing speed of the door by adjusting the flow rate. is the same as the conventional one.

Thus, the present invention provides a hydraulic mechanism 1 inside the compression spring 4.
7, and when the door is opened to a predetermined angle, the internal pressure is increased by being pushed by the piston 5, and the opening rotation of the door is controlled by this internal pressure,
As shown in FIGS. 1 to 3, this hydraulic mechanism 17 includes a small cylinder 18 disposed inside the compression spring 4, a pressure valve 19 mounted on the rear end of the small cylinder 18, and
A small compression spring 20 is installed inside the pressure valve 19 with one end supported.
A small piston 21 is loaded to form a pressurizing chamber 22,
When the door reaches a predetermined opening angle, the small piston 21 is pushed in by the head of the piston 5 against the elastic force of the small compression spring 20, and the pressurizing chamber 22 is pressurized. The pressure valve 19 is provided to control the opening rotation of the door, and the pressure valve 19 is connected to the pressure chamber 22 side to a passage hole 24 provided in the valve body 23 to communicate the spring chamber 10 and the pressurization chamber 22. It is formed by sequentially and coaxially arranging a valve ball 25, a washer 26, an elastic valve 27, and a washer 26, and when the internal pressure of the pressurizing chamber 22 becomes too high, the valve ball 25 is pushed toward the elastic valve 27 side. The passage hole 24 is opened, and the oil in the pressurizing chamber 22 flows through the passage hole 2.
4 to the spring chamber 10, and when the internal pressure further increases, the elastic valve 27 is compressed and deformed by the valve ball 25, and the passage hole 24 is compressed and deformed.
The structure is designed to close the valve and cut off the flow of oil.

Here, the passage hole 24 is formed such that a small diameter portion 24a and a large diameter portion 24b are coaxial, and the valve ball 25 is movable in the axial direction in the small diameter portion 24a. On the other hand, the elastic valve H is installed in the large diameter portion 24b with washers 26 and 26 interposed between the large diameter portion 24b, and an oil passage 28 is formed between the large diameter portion 24b and the peripheral wall of the large diameter portion 24b. The valve ball 25 is made to impact on the valve seat 29 by its elastic restoring force, and normally the pressurizing chamber 22 is isolated from the spring chamber 10.

In the above configuration, the door (not shown) is connected to the piston 5.
When the door is closed, the door closer A is in the state shown in FIG. 1, and the hydraulic mechanism 17 is also in the state shown in FIG. The piston 21 is spaced apart from the piston 5 to enable normal door opening rotation.

When the door is opened from the closed state, the piston 5 slides to the left on the drawing paper while compressing the compression spring 4, and the normal opening rotation is performed, but the hydraulic mechanism 17 does not operate at this time.

When the door reaches a preset opening angle, the head portion of the piston 5 comes into contact with the small piston 21, which is pushed by the small compression spring 2.
Since it is pushed into the small cylinder 18 against zero elastic force, the pressure chamber 22 is pressurized and the internal pressure is increased, and the opening rotation of the door is controlled by this internal pressure.

In other words, a backcheck effect is produced. If the internal pressure becomes too high at this time, the valve ball 25 is pressed and separated from the valve seat 29 and the passage hole 24 is opened, so that the oil in the pressurized chamber 22 passes through the oil passage 28 of the passage hole 24. When the internal pressure is further increased, the valve ball 25 is further pushed and moved, thereby compressing the elastic valve 27.

At this time, the elastic valve 27 is deformed to expand its diameter as shown in FIG. 3, so the oil passage 28 is closed and the flow of oil is interrupted, thereby completely stopping the opening of the door.

When the door is rotated from the above-mentioned open position to the door closing direction, the piston 5 is pushed and slid to the right by the restoring force of the compression spring 4, and at the same time, the hydraulic mechanism 17 is moved by the restoring force of the small compression spring 20. As a result, the small piston 21 is pushed and slid to the right to return to the state shown in FIG.

At this time, oil flows from the piston head chamber 12 side to the speed regulating valve 1.
6 to the spring chamber 10, while the oil in the spring chamber 10 passes through the gap between the small cylinder 18 and the small piston 21 to the pressurizing chamber 2.
2.

The door is closed by the above operation.

Also, according to the present invention, the small cylinder 18 has an oil passage hole 3.
On the other hand, a seal ring 31 is provided around the tip of the small piston 21, and a check valve 33 is arranged in a passage hole 32 provided to communicate the spring chamber 10 and the pressurizing chamber 22. If formed in this way, the oil can flow from the spring chamber 10 to the pressurizing chamber 22 more quickly when the small piston 21 returns to sliding, so that the hydraulic mechanism 17 when the door is closed is This can make the return process smoother.

As explained above, according to the door closer back check device according to the present invention, the compression spring 4 of the door closer
A hydraulic mechanism 17 is disposed inside the hydraulic mechanism 17, and when the door opens at a predetermined angle, the piston 5 compresses the small piston 21 to increase the internal pressure in the pressurizing chamber 22 of the hydraulic mechanism 17, and this internal pressure opens the door. Since the hydraulic mechanism 17 is configured to control the opening rotation, it is possible to obtain a constant back check effect regardless of changes in the viscosity of the hydraulic oil due to temperature changes. To,
Since the pressure valve 19, which is formed by incorporating the valve ball 25 and the elastic valve 27, is installed and formed, if the internal pressure of the pressurizing chamber 22 becomes too high due to the pushing action of the small piston 21 when the door is opened,
The valve ball 25 moves due to the internal pressure, opens the passage hole 24, and allows oil to flow into the spring chamber 10. When the internal pressure further increases, the valve ball 25
Since the elastic valve 27 is compressed and deformed to block the passage hole 24, the back-check effect described above does not occur suddenly but works gradually. It has the effect of reducing impact force and achieving a static back-check effect.

[Brief explanation of drawings]

Fig. 1 is a vertical side view showing the back check device for a door closer according to the present invention in a closed state, and Figs. 2 and 3 respectively show the hydraulic mechanism in the device. FIG. 3 is an enlarged longitudinal side view of the back check operation state. 3...Cylinder, 4...Compression spring, 5
... Piston, 10 ... Spring chamber, 17
...Hydraulic mechanism, 19...Pressure valve, 18
...Small cylinder, 20 ...Small compression spring, 21 ...Small piston, 22 ...Pressure chamber, 24 ...Passage hole , 25...benkyoku,
27...Elastic valve.

Claims (1)

[Scope of utility model registration request] In a door closer, a compression spring 4 is used to elastically bias a piston 5, which is inserted into a cylinder 3 and linked to the opening and closing of the door, as a door closing force, and when a predetermined opening angle is reached, the piston performs a compression action. A hydraulic mechanism 17 that can control the opening rotation of the door using this internal pressure is disposed inside the compression spring. The pressurized chamber 22 in the small cylinder is equipped with a passage hole 24 that communicates the pressurized chamber with the spring chamber 10 when the internal pressure exceeds a predetermined internal pressure, and when the internal pressure becomes excessive, the passage hole A back check device for a door closer, characterized in that a pressure valve 19 formed by coaxially housing a valve ball 25 and an elastic valve 27 so as to be able to close the same is attached to the above-mentioned small cylinder.