JPS5815596B2 - Door closing speed adjustment device for door closers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a door closing speed adjusting device for a door closer.

In general, a door closer is configured to automatically close a door after it has been opened, early at first and later just before closing, by moving a piston housed in a cylinder while being controlled by oil.

By the way, conventional door closers of this type have a rack 3 in a cylinder 1 filled with oil, which meshes with a pinion 2 for transmitting the rotational force of the door, as shown in FIGS. 1 and 2. A piston 4 carved in the recessed part is accommodated, and a compression chamber a and a non-compression chamber are formed on both sides of the piston 4 by the spring force of a spring 5 compressed between the rear end of the piston 4 and the inner wall of the cylinder 1. The two chambers a and b are communicated through a first speed passage 6 and a second speed passage 7 provided in the peripheral wall of the cylinder 1, and a speed regulating valve 8 is provided in the passages 6 and 7.
, 9 are generally provided.

FIG. 1 shows a state in which the door enters the closing operation from the fully open position, but at this time, the compression chamber a and the non-compression chamber A are communicated through the first speed passage 6, and the oil liquid is The fluid flows quickly and the door closes quickly, but when the door is about to close as shown in FIG. 2, the first speed passage 6 is blocked and the compression chamber a and the non-compression chamber A are communicated with each other through the second speed passage 7. The amount of oil pushed out by the piston 4 is reduced, and as a result,
The door closing speed is controlled and the door closes gently.

However, according to the above door closing speed adjusting device, if a strong external force such as wind pressure is applied to the door just before closing, the door will quickly fully close, which may cause damage to the door and other accessories.

Furthermore, it was extremely dangerous as there was a risk of pinching hands.

In view of the above-mentioned drawbacks, the present invention is an improvement on the above-mentioned drawbacks.
To provide a door closing speed adjusting device for a door closer that can always maintain a slow closing speed even if a strong external force such as wind pressure is applied to the door just before closing.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

In FIG. 3, 11 is a door closer fixed to a door (not shown) that rotates around a hinge; 12
．． Reference numeral 13 denotes a continuous rod, and the ends of each of the continuous rods 12 and 13 are pivotally connected, and the base end of the continuous rod 12 is pivotally connected to a support bracket (not shown) fixed to a wall surface or the like.

Reference numeral 14 denotes a rotation shaft rotatably supported at a predetermined position on the side wall 15a side of the case 15, and the base end of the connecting rod 13 is engaged with the upper end 14 of the rotation shaft so that the rotation of the door can be transmitted. Tighten and fix with a bolt 17 through a washer 16.

A pinion 18 is fitted and fixed to the intermediate portion of the rotating shaft 14.

Reference numeral 19 denotes a piston rod, one end of which is bolted to a case seat plate 20 provided on a side wall 15b opposite to the side wall 15a of the case 15, and is provided to protrude horizontally toward the rotating shaft 14 side.

A piston 21 is screwed onto the tip of the piston rod 19, and a part of the piston 21 is provided with an oil passage 22 that penetrates in the axial direction, and the passage 22 has a slightly larger diameter on the rod 19 side. This portion constitutes a valve seat and accommodates the valve ball 23.

A cylinder 24 is slidably fitted onto the piston 21 and filled with oil, and has a rack 25 on the outer end surface 24a on the rotating shaft 14 side, which engages with the pinion 18.
It protrudes toward the side wall 15a of the case 15.

Reference numeral 26 denotes a return spring compressed and interposed between the outer end surface 24b of the cylinder 24 on the rod 19 side and the side wall 15b of the case 15. The spring force of this spring 26 creates a compression chamber a and a non-compression chamber on both sides of the piston 21. and by constantly biasing the cylinder 24 to the left in FIG.
The piston 21 is located at the right end in the cylinder chamber.

In this state, the door will be open.

Reference numerals 27 and 28 denote oil passages formed in the peripheral wall of the cylinder 24, through which oil flows when the door is closed.

The oil passage 27 has openings 29 and 30 at both ends near the inner end surface 24a' of the cylinder 24 on the rack mounting side and near the end surface 21a of the piston 21 in the open state. A first speed regulating valve 31 is incorporated in the middle.

Further, the oil passage 28 is connected to the oil passage 27 bp just before closing the door.
A passage for communicating the compression chamber a and the non-compression chamber A after the opening 30 of the piston 21 is closed,
One end opening 32 is opened between the end surface 21b of the piston 21 in the open state and the rod-side inner end surface 24b' of the cylinder 24, and the other end opening 33 is opened near the center of the cylinder 24. A second speed regulating valve 34 is installed in the middle of the passage 23.

35 is a flow rate adjustment valve for adjusting the flow rate of the oil incorporated into the oil passage 28 on the upstream side of the second speed adjustment valve 34.

The structure of this flow rate regulating valve 35 is shown in FIGS. 4 and 5. In the drawings, 36 is a hole bored in the peripheral wall of the cylinder 24, and its tip 36' intersects with the oil passage 28. It is.

37 is an adjustment screw screwed into the hole 36, and 38 is an O-ring.

Reference numeral 39 denotes a bypass oil passage, one end opening (not shown) communicates with the opening 32 of the oil passage 28 in the non-compression chamber in close proximity to the opening 32 of the oil passage 28 at a circumferentially shifted position, and the other end opening 39 communicates with the light scattering end portion 36'.

40 is a piston for opening and closing the oil passage 28;
This is slidably inserted into the light scattering end portion 36' that intersects with the oil passage 28, and one end edge 40 thereof is formed in a trapezoidal shape, and a hole 36 is formed in the center. A through hole 41 that communicates the oil passage 28 and the bypass oil passage 39.
Moreover, the through hole 41 has a small diameter on the adjustment screw 37 side and a large diameter on the bypass passage 39 side.

A spring 42 is compressed and interposed between the adjustment screw 37 and the piston 40. The spring force of the spring 42 normally urges the piston 40 toward the bypass oil passage 39 to open the oil passage 28. state, and the bypass oil passage 39 is connected to the oil passage 28 through the through hole 41 of the piston 40.
When the door receives a strong external force such as wind pressure, the piston 40 is pressed by the oil against the spring force and closes the oil passage 28. If this condition continues, the spring force of the spring 42 will gradually overcome the pressurized oil pressure on the side of the bypass oil passage 39 and press the piston 40 little by little towards the side of the passage 39. There is.

When the metal door (not shown) is opened, the pinion 18 fitted and fixed to the rotating shaft 14 is activated as the door opens.
rotates clockwise, and as a result, the rack 25 meshed with the pinion 18 moves to the right, and the cylinder 24 moves in the direction of the arrow in FIG. It is located at the position indicated by the chain line.

At this time, the oil-liquid method immediately flows from the compression chamber a into the non-compression chamber through the oil passage 22 of the piston 21 and into the cylinder 2.
4 moves smoothly and the door opens fully.

Next, when the door begins to close, the cylinder 24 is pressed by the urging force of the return spring 26 and moves to the left from the state indicated by the dashed line in the figure.

At this time, the oil passage 22 of the piston 21 is closed by the valve ball 23, so the oil flows through the oil passage 27, which communicates the non-compression chamber and the compression chamber a, to the first speed regulating valve 31. While the flow rate is being adjusted, it flows from the non-compression chamber to the compression chamber a, and as a result, the cylinder 24 moves relatively quickly in the direction opposite to the direction of the arrow shown in the figure, and the door is closed until just before closing.

In this manner, just before the door is closed, the opening 30 of the oil passage 27 is closed by the piston 21, and the non-compression chamber and the compression chamber a are communicated through the oil passage 28 and the bypass oil passage 39.

Then, the oil flows from the non-compression chamber to the compression chamber a while its flow rate is adjusted by the second speed regulating valve 34, thereby slowing down the moving speed of the cylinder 24 and gently closing the door.

At this time, the piston 4 disposed to intersect with the oil passage 28
0 is biased toward the bypass oil passage 39 by the spring force of the spring 42, and the oil passage 28 is held open as shown in FIG.

Then, when a strong external force such as wind pressure is applied to the door in the closing direction during slow closing immediately before closing, the external force is applied to the rotation axis 1.
4 pinion 18 and rack 25 to the cylinder 24
The cylinder 24 is then rapidly moved in the direction opposite to the direction of the arrow in FIG.

Then, the oil in the non-compression chamber is pressurized, and as a result,
The piston 40, which is disposed to intersect with the oil passage 28, is pressed toward the adjustment screw 37 by the pressurized oil in the bypass oil passage 39 against the biasing force of the spring 42, as shown in FIG. The oil passage 28 is closed to block the flow of oil from the non-compression chamber to the compression chamber a, and the door closing operation is stopped.

When the pressurized state of the oil continues, the oil on the side of the bypass oil passage 39 flows through the through hole 41 of the piston 40.
Since the oil flows into the hole 36 side through The oil passage 28 opens little by little and begins to flow into the compression chamber a while the amount of oil flowing out from the non-compression chamber is controlled.

Then, the cylinder 24 slowly moves in the direction opposite to the direction of the arrow in FIG. 3 even though the door is receiving strong external force such as wind pressure, and the door fully closes while maintaining a slow speed.

If a strong external force is applied to the door again during this slow closing, the oil passage 28 that communicates the non-compression chamber with the compression chamber a will be damaged by the piston 4.
0, the door is opened and closed in the manner described above, and the door closes while maintaining a slow speed.

The same operation is repeated when opening and closing the door. As above,
The present invention compresses a spring when the door is opened, moves the cylinder and the piston provided in the cylinder relatively, and automatically closes the door with the stored force of the spring. The oil filled in the chambers on both sides of the piston in the cylinder in front of the end face is throttled by a speed regulating valve installed in the middle of the oil passage on the cylinder peripheral wall to reduce the closing speed and ensure quiet closing. Door
In the closer, a hole intersecting the passage is provided in the middle of the oil passage provided with the speed adjustment valve, and a piston-type flow rate adjustment device slides in the hole in a manner intersecting with the passage to open and close the passage. A valve is provided, and a spring acting on one end of the flow rate adjustment valve is used to maintain the flow rate adjustment valve in a state in which the passage is open at all times, and the other end of the flow rate adjustment valve is connected to the inside of the cylinder via a bypass passage. Of the chambers on both sides of the piston, the chamber is connected to the side where the oil liquid is compressed and pushed out when the door is closed, and the pressure in this chamber is applied to the other end of the flow rate regulating valve in opposition to the spring, and when the door is closed, When wind pressure or the like in the closing direction acts on the door, the flow rate adjustment valve is moved in a direction in which the passage is closed against the spring, and the flow rate adjustment valve is connected to both ends of the valve. By providing a small diameter through hole, when the passage is closed by the valve, the hydraulic pressure on both sides of the valve is balanced, and the spring force operates the valve in the opening direction. When an external force such as a gust of wind or strong wind pressure acts on the door in the direction of closing the door, the flow control valve automatically completely blocks off the oil passage, temporarily interrupting the door's closing, and then The oil pressure on both sides of the flow rate adjustment valve approaches equilibrium through the small-diameter through hole, and the spring force overcomes the flow rate adjustment valve to gradually open the flow rate adjustment valve and perform an adjustment operation to increase the oil flow rate in the passage, The door can be moved in the closing direction again and the closed end can be reached quietly and safely.

Therefore, there is no fear that the door or other accessories will be damaged or that human hands will be trapped, making it extremely safe.

Furthermore, even if a strong external force such as wind pressure continues to be applied to the door, the door gradually closes at a slow speed from the stopped state, which is extremely convenient.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views explaining the operation of a conventional door closer, and Figure 3 is a door closer equipped with the device of the present invention.
A vertical sectional view of the closer, and FIGS. 4 and 5 are cross-sectional views of the device of the present invention, with FIG. 4 showing the piston before operation, and FIG. 5 not showing the piston after operation. 11...Door closer, 21...
Piston, 24...Cylinder, 26...
・Returning spring, 27.28... Oil passage, 32... Opening, 39... Bypass oil passage, 39'... Opening , 40...
・Piston, 41...Through hole, 42...
·spring.

Claims (1)

[Claims] 1 When the door is opened, the spring is compressed to move the cylinder and the piston provided in the cylinder relatively, and the stored force of this spring automatically closes the door. The door is designed to slow down the closing speed by throttling the oil filled in the chambers on both sides of the piston in the cylinder with a speed regulating valve installed in the middle of the oil passage provided on the cylinder peripheral wall, so that the door closes quietly. In the closer, a hole intersecting the passage is provided in the middle of the oil passage provided with the speed adjustment valve, and a piston-type flow rate adjustment device slides in the hole in a manner intersecting with the passage to open and close the passage. A valve is provided, and a spring acting on one end of the flow rate adjustment valve is used to maintain the flow rate adjustment valve in a state in which the passage is open at all times, and the other end of the flow rate adjustment valve is connected to the inside of the cylinder via a bypass passage. Of the chambers on both sides of the piston, the chamber is connected to the side where the oil liquid is compressed and pushed out when the door is closed, and the pressure in this chamber is applied to the other end of the flow rate adjustment valve in opposition to the spring, and when the door is closed, When wind pressure or the like in the closing direction acts on the door, the flow rate adjustment valve is moved in a direction in which the passage is closed against the spring, and the flow rate adjustment valve is connected to both ends of the valve. A small-diameter through hole is provided so that when the valve closes the passage, hydraulic pressure on both sides of the valve is balanced, and the spring force operates the valve in the opening direction. Door closing speed adjustment device for door closers.