JP3349675B2 - Door closer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door closer, and more particularly, to a door closer which is provided with a countermeasure against flow noise caused by air filled with a predetermined amount together with a fluid such as hydraulic oil.

[0002]

2. Description of the Related Art An example of a conventional door closer will be described with reference to FIGS. 3 to 5 show a state where the door closer main body 1 is attached to the door substantially horizontally.
The door closer main body 1 is provided with a cylinder 2 filled with hydraulic oil inside the door closer main body 1 along its longitudinal direction.
In addition, both front and rear ends in the axial direction are sealed by end plugs 3 and 4, respectively, to be in a sealed state. A predetermined amount of air 5 is mixed in the cylinder 2 together with the hydraulic oil. This is to prevent the cylinder 2 and the like from being damaged by absorbing the pressure increase in the cylinder 2 due to the temperature rise and the like by the compression of the air 5.

The door closer main body 1 is provided with a pinion shaft 6 orthogonal to the cylinder 2, and an end 7 of the pinion shaft 6 projects from the door closer main body 1. An arm is attached to the protruding end 7, a bracket is attached to a tip of the arm, and the bracket is attached to a mounting frame of the door. On the other hand, the door closer main body 1 is attached to the door, whereby the pinion shaft 6 is configured to rotate according to the opening / closing operation of the door. The door, arm and bracket are not shown.

A piston 8 is provided inside the cylinder 2 so as to be movable in the axial direction of the cylinder 2 by the rotation of the pinion shaft 6. The piston 8 has a piston head 9 formed on the front end side, a disc-shaped spring holding wall 10 formed on the rear end side, and a piston internal space 11 formed between the piston head 9 and the spring holding wall 10. . In addition, the piston head 9 and the spring holding wall 10 are connected by the connecting portion 12, and the piston head 9,
The piston 8 is formed by integrally forming the spring holding wall 10 and the connecting portion 12. In addition, the connecting portion 12 includes
As shown in FIG. 6, a rack 13 that meshes with the pinion gear 6a of the pinion shaft 6 is formed.

[0005] As described above, the cylinder 2 is divided into two oil chambers as a whole by the piston 8 being housed in the cylinder 2. That is, a front oil chamber 14 (a space between the piston head 9 and the front end plug 3) on the front side of the piston head 9 and a rear oil chamber 15 (a space between the piston head 9 and the rear end plug 4) on the rear side. The rear oil chamber 15 is provided with a spring holding wall 1.
0 and the spring receiving space 16 between the rear end plug 4
And the piston internal space 11.
The spring housing space 16 is provided with a spring 17 for urging the piston 8 toward the front oil chamber 14.

Further, the front oil chamber 14 and the rear oil chamber 15 are
A communication hole 18 formed substantially at the center of the piston head 9 (on the center axis of the cylinder 2) is communicated with the door closer main body 1 via an adjustment flow path 19 formed substantially parallel to the cylinder 2. The communication hole 18 is provided with a check valve 20 which is closed when the piston 8 moves to the front oil chamber 14 side, that is, when the door is closed. An adjustment valve 21 for adjusting the flow rate of the working oil flowing through the inside 19 is provided.

The regulating valve 21 has a valve body 22 movable in the regulating flow path 19, and a V groove 23
When the adjustment valve 21 is moved in the adjustment flow path 19 by a driver or the like, the valve element 22 moves as shown in FIG. 7, and accordingly, the V-groove 23 and the adjustment flow path inner peripheral surface 19 are formed.
The cross-sectional area of the space between “a” and “a” changes in size, whereby the flow rate can be adjusted.

On the other hand, the piston internal space 11 and the spring accommodating space 16 communicate with each other through a through hole 24 substantially at the center of the disk-shaped spring holding wall 10 (on the center axis of the cylinder 2). The through hole 24 has a large diameter so that the hydraulic oil can flow freely even when the piston 8 moves. That is, by increasing the size of the through hole 24, the piston internal space 11
And the spring accommodating space 16 are integrated into one rear oil chamber 15.
It is formed as.

Next, the operation of the door closer having the above configuration will be described. First, in the fully closed state of the door shown in FIG. 3, the piston 8 is in the front oil chamber 14 side (the left side in the figure).
It is located in. When the door starts to be opened from this state, the pinion shaft 6 rotates according to the door opening operation, and the piston 8 moves to the spring 17 side (the right side in the figure) (the state of FIG. 4).
At the time of opening the door, in which the piston 8 moves toward the spring housing space 16 against the urging force of the spring 17, the hydraulic oil on the rear oil chamber 15 side becomes the front oil via the communication hole 18 and the adjustment flow path 19. It flows to the chamber 14 side.

On the other hand, when the door is closed, as shown in FIG. 5, the piston 8 is moved toward the front oil chamber 14 by the elastic restoring force of the spring 17, but the check valve 20 is closed.
Hydraulic oil is supplied to the piston internal space 1 only through the adjustment flow path 19.
1 (rear oil chamber 15 side). Here, the adjustment flow path 1
As a result of the flow rate of the hydraulic oil flowing through the inside 9 being adjusted by the throttle amount of the adjustment valve 21, the moving speed of the piston 8 is adjusted,
The closing speed is adjusted and controlled.

[0011]

As described above, in this type of door closer, as the piston 8 moves,
Although the filled hydraulic oil flows through the adjustment flow path 19, since the predetermined amount of air 5 is mixed in the cylinder 2 as described above, the air 5 also flows with the flow of the hydraulic oil. Together, they flow in the adjustment flow path 19.

That is, when the door 5 is attached to the door as shown in FIGS.
Although it accumulates above the piston internal space 11 in the cylinder 2, the adjustment flow path 19 is located on the upper side in this mounted state, and therefore, when the door is opened, the adjustment flow path 19 is located on the piston internal space 11 side. The hydraulic fluid and air 5 (FIG. 3) flow into the adjustment flow path 19 together with the hydraulic oil from the opening 19b, and V
The oil flows into the front oil chamber 14 from the groove 23. When the door is opened, the check valve 20 is open, but the communication hole 18 is
The air 5 collected above does not pass through the check valve 20.

When the door is closed, the air 5 that has moved to the front oil chamber 14 via the adjustment flow path 19 is
The flow enters the adjustment flow path 19 through the opening 19c on the side, and emits flow noise. Further, when the door is closed, since the check valve 20 is in the closed state and the hydraulic oil flows only through the adjustment flow path 19, the flow noise when the air 5 passes through the V-groove 23 is mainly communicated. It becomes even more intense than when the door is opened when the hydraulic oil flows through the hole 18. Therefore, especially, the flow noise at the time of closing the door is a problem.

In this type of door closer in which the front oil chamber 14 and the rear oil chamber 15 in front of and behind the piston head communicate with each other through the adjustment flow path 19 having the adjustment valve 21, conventionally, the inside of the cylinder 2 Since the air 5 mixed into the cylinder 2 flows freely in the cylinder 2 together with the fluid, there is a problem that the flow noise is generated every time the air 5 in the cylinder 2 passes through the regulating valve 21. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the mixed air is retained at a predetermined location so that the mixed air does not enter the adjusting flow passage. An object of the present invention is to provide a door closer which can prevent a flow noise generated when passing through a regulating valve inside the door closer.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a door closer according to the present invention has a piston head 9 provided in a fluid chamber of a door closer main body 1 so that the piston head 9 can be mounted. On both sides, an adjustment channel 1
9 and the first fluid chamber 14 and the second fluid chamber 1
A door closer provided with an adjusting valve 21 for adjusting the moving speed of the piston head 9 by adjusting the flow rate of the fluid flowing in the adjusting channel 19. , The door closer body 1 is provided with a third fluid chamber 16 communicating with the fluid chamber via a communication passage, and the fluid chamber and the third fluid chamber 16 are filled with a fluid, and In the third fluid chamber 16, in order to absorb a pressure increase in the fluid chamber and the third fluid chamber 16,
A passage opening 28 on the third fluid chamber 16 side of the communication passage is formed so that a predetermined amount of air 5 is mixed in and the air 5 in the third fluid chamber 16 can be prevented from entering the fluid chamber. It is characterized by projecting toward the third fluid chamber 16 side.

In the door closer having the above configuration, a third fluid chamber 16 is provided separately from the first fluid chamber 14 and the second fluid chamber 11 which communicate with each other through an adjustment flow path 19 having an adjustment valve 21. A predetermined amount of air 5 is contained in the third fluid chamber 16. Since the third fluid chamber 16 and the fluid chamber communicate with each other through the communication passage, the fluid can flow freely through the communication passage, but the air 5 is prevented from entering the fluid chamber.
Since the passage opening 28 of the communication passage on the third fluid chamber 16 side is provided so as to protrude toward the third fluid chamber 16 side, the third fluid chamber 16
There is no possibility that the air 5 contained in the fluid chamber enters the fluid chamber through the communication path.

That is, since the air 5 always attempts to be located on the upper side, the air 5 is located not along the central portion of the third fluid chamber 16 but along the inner wall surface thereof. Therefore, the air 5 flows into the third fluid chamber 1
In the inner wall surface of No. 6, it is located at the uppermost position in the state where the door closer main body 1 is attached. On the other hand, since the passage opening 28 of the communication passage is protruding, the passage opening 28 is always located at the lower side from the uppermost position regardless of the mounting state of the door closer body 1, and the air 5 is
It will accumulate on the upper side.

As described above, regardless of the installation state of the door closer, the air 5 accumulates above the passage opening 28, so that the fluid flows through the fluid chamber and the third fluid chamber with the movement of the piston head 9. Air 5
Always stays in the third fluid chamber 16 and does not enter the regulating channel 19 through the fluid chamber. Therefore, only the fluid passes through the adjustment valve 21 in the adjustment flow path 19.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same components as those of the above-described conventional device are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a cross section of a door closer main body 1 of the door closer according to the present embodiment, and shows an operation state when the door closer is closed in a substantially horizontal state.

The door closer main body 1 is provided with a cylinder 2 filled with hydraulic oil therein, as in the prior art, and a piston 8 is movably mounted in the cylinder 2. The piston 8 includes a front end side piston head 9, a rear end side disk-shaped spring holding wall 10, and a connecting portion 12 that connects the piston head 9 and the spring holding wall 10 in the axial direction to integrate them. A front oil chamber 14 (first fluid chamber) is formed between the piston head 9 and the front end plug 3, and a piston internal space 11 (first fluid chamber) is formed between the piston head 9 and the spring holding wall 10. Two fluid chambers).
Further, the front oil chamber 14 and the piston internal space 11 are connected to the communication hole 18 of the piston head 9 provided with the check valve 20,
In the present embodiment, the fluid chamber is constituted by the front oil chamber 14 and the piston internal space 11 through the adjustment flow path 19 having the adjustment valve 21.

Further, a rack 13 (see FIG. 6) which meshes with the pinion shaft 6 is formed in the connecting portion 12, and the piston 8 can move along the axial direction of the cylinder 2 by the rotation of the pinion shaft 6. In addition, since the piston head 9 and the spring holding wall 10 are connected by the connecting portion 12, the piston head 9 and the spring holding wall 10 move integrally.

A spring 17 is housed between the spring holding wall 10 and the rear end plug 4, and the piston 17 constantly biases the piston 8 toward the front end plug 3.

The above configuration is the same as the conventional one, but in the door closer according to the present embodiment, the spring holding wall 1
The point that the cap 25 is provided on the side of the spring 17 is different from the conventional one. As shown in FIG. 2, the cap 25 has a substantially U-shaped cylindrical portion 26 having an open end, and an annular flange portion 27 formed at an open end of the cylindrical portion 26 toward the outside. It consists of. The cylindrical portion 26 and the flange portion 27 are formed coaxially, and the cylindrical portion 26 is formed in a tapered shape tapering toward the side opposite to the opening side. Is located at the center of the opposite end (on the central axis of the cylindrical portion 26).
Is formed. That is, the fluid hole 28 is formed at a position farthest from the flange 27.

The cap 25 having the above structure is pressed and fixed to the spring holding wall 10 by pressing the flange portion 27 by the spring 17, and is installed so that the fluid hole 28 faces the rear end plug 4 side. ing. More specifically, the cylinder 2 is installed so that the center axis of the cylinder 2 and the center axis of the cap 25 are substantially coincident with each other. The fluid hole 28 of the cap 25 is located on the center axis, and the fluid hole 28 is It is located farthest from the wall 10.

By providing the cap 25 in this manner, a gap between the cap 25 and the rear end plug 4 is provided.
A spring accommodating space 16 (third fluid chamber) accommodating the spring 17 is formed. In this embodiment, a predetermined amount of air 5 is mixed into the spring accommodating space 16.
This absorbs a pressure rise in the cylinder 2 due to a temperature rise or the like.

The spring accommodating space 16 and the piston internal space 11 communicate with each other through an oil passage (communication passage) including a fluid hole 28 of the cap 25 and a through hole 24 of the spring holding wall 10. The flow of each other's hydraulic oil is ensured. In other words, a partition wall is formed from the spring holding wall 10 and the cap 25, and the piston inner space 11 and the spring accommodating space 16 are partitioned by the partition wall. The partition wall is operated by an oil passage formed in the partition wall. Oil flow is ensured. Moreover, the fluid hole 28, which is the passage opening of the oil passage on the spring housing space 16 side, prevents the air 5 in the spring housing space 16 from entering the piston housing space 11 side.
It is provided so as to protrude toward the spring housing space 16 and is located on the central axis of the spring housing space 16.

With respect to the amount of protrusion of the fluid hole 28 from the flange 27, if the front oil chamber 14 is rotated upward, air 5 will accumulate on the surface of the flange 27 of the rear oil chamber 15. At this time, it is desirable that the fluid hole 28 is located below the layer of the air 5. Further, the cap 25 is assembled into the main body 1 from the rear end plug 4 side from the flange portion 27 side, but the cap 25 inserted into the cylinder 2 rolls over in the cylinder 2 so that the fluid hole 28 side faces the spring holding wall 10 side. It is desirable to set the protruding amount so as not to cause the problem. Preferably, the diameter is at least 2/3 of the diameter of the cylinder 2 and is as large as possible within a range where the cap 25 does not contact the rear end plug 4.

Next, a method of mixing the above-mentioned predetermined amount of air 5 in the door closer having the above configuration will be described. First, at the time of assembling the door closer main body 1, after the air 5 is mixed into the front oil chamber 14 and the piston internal space 11, after assembly, the door closer main body 1 is set upright so that the rear end plug 4 is upward, and the pinion shaft is rotated. The air 5 is guided upward by rotating the piston 6 to move the piston 8 to flow the hydraulic oil. By positioning the spring housing space 16 upward and causing the hydraulic oil to flow by the movement of the piston 8, the air 5 can be introduced into the spring housing space 16 through the oil passage. A state in which air 5 is mixed can be created. After the air 5 is once stored in the spring housing space 16,
The door closer body 1 may be leveled, or the spring housing space 16 may be used.
Even if it is set upright on the lower side, the fluid hole 28 protrudes toward the spring accommodating space 16 and is located closer to the center of the spring accommodating space 16 than the other inner wall surface of the spring accommodating space 16. There is no possibility that the air 5 returns to the piston internal space 11 side. However, besides this mixing method, for example, a predetermined amount of air 5 can be mixed directly into the spring accommodating space 16. The piston 8 moves by a predetermined amount along the axial direction of the cylinder 2.
9b is always open to face the piston internal space 11 so that it does not go beyond the spring holding wall 10 to the spring housing space 16 side.

On the other hand, a predetermined amount of air 5 is
When the door closer body 1 is horizontally mounted on a door or the like as shown in FIG. 1 and the door is opened and closed, for example, as shown in FIG. 1, the piston 8 reciprocates back and forth according to the rotation of the pinion shaft 6. This operation is the same as the conventional one.

However, in the present embodiment, since the cap 25 is provided on the spring housing space 16 side of the piston 8 and the air 5 is mixed only into the spring housing space 16, no flow noise is generated when the piston moves. is there.

That is, when the door is opened, the piston 8 moves to the spring housing space 16 side. Although the oil flows out to the oil chamber 14 side, even if the hydraulic oil flows out from the spring housing space 16 side to the piston internal space 11 side through the fluid hole 28, the air 5 stays in an upper state as shown in FIG. It is. In the horizontally mounted state, the uppermost portion in the spring accommodating space 16 is the upper cylinder wall surface, and the fluid hole 28 is located on the central axis of the cylinder 2 and is separated from the upper cylinder wall surface. That's why. Note that the same applies even if the state of FIG. 1 is reversed upside down.

When the door is closed, the hydraulic oil flows in the direction opposite to the direction when the door is opened. However, since the air 5 is not mixed in the front oil chamber 14 side, only the hydraulic oil passes through the adjustment flow path 19. It will be.

As described above, the air 5 is mixed only into the spring accommodating space 16 and the air 5
The spring housing space 1 of the piston 8 does not
Since the cap 25 having the fluid hole 28 is provided on the side 6, even if the piston 8 moves in accordance with the opening / closing operation, the air 5 always stays in the spring accommodating space 16 and only the hydraulic oil is adjusted. It passes through the regulating valve 21 in the path 19. Therefore, the generation of the flowing noise can be prevented beforehand and surely.

The shape of the cap 25 can be freely changed in accordance with the amount of the air 5 mixed therein. However, the fluid hole 28 is provided at the tip farthest from the flange 27, and the fluid hole 28 is provided. It is preferable to be located on the central axis of the cap 25. This makes it possible to reliably prevent the air 5 from entering the piston internal space 11 irrespective of the mounting state such as the mounting angle of the door closer. Further, the cap 25 can be formed integrally with the piston 8.

Further, in the above embodiment, the spring accommodating space 1
6 is provided as a third fluid chamber by providing a cap 25, but a third fluid chamber may be separately provided in addition to the cylinder 2, and a predetermined amount of air 5 may be mixed into the third fluid chamber. That is,
As in the above-described embodiment, the third fluid chamber and the fluid chamber may not be provided coaxially or may have a configuration in which the volume of the third fluid chamber changes as the piston 8 moves. At least when the first fluid chamber and the second fluid chamber communicated with each other by the adjustment flow path 19 before and after the piston head 9 are formed, the fluid chamber including the first fluid chamber and the second fluid chamber is Separately, by providing a third fluid chamber communicating with the fluid chamber via a communication passage, mixing a predetermined amount of air 5 into the third fluid chamber, and preventing the air 5 from entering the fluid chamber side. Therefore, only the hydraulic oil passes through the adjustment valve 21 in the adjustment flow path 19, so that the flow noise can be prevented. Therefore, the third fluid chamber may be one that communicates with the first fluid chamber or one that communicates with both fluid chambers, in addition to the one that communicates with the second fluid chamber.

[0038]

As described above, in the door closer according to the present invention, a predetermined amount of air is not introduced into the first fluid chamber and the second fluid chamber communicated via the adjustment flow path, Since a predetermined amount of air is put in a third fluid chamber different from that of the first fluid chamber and this air is retained in the third fluid chamber, only the fluid passes through the regulating valve in the regulating flow path. In addition, the flow noise generated due to the air passing through the regulating valve together with the fluid can be prevented beforehand and surely.

Although air is mixed in the third fluid chamber different from the fluid chamber, the flow of the fluid between the fluid chamber and the third fluid chamber is ensured by the communication passage. The air in the fluid chamber can absorb and mitigate the pressure rise in the fluid chamber and the third fluid chamber due to the temperature rise and the like.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a main part of a door closer according to an embodiment of the present invention.

FIG. 2 shows a main part of the door closer of the embodiment;
(A) is a plan view, (B) is a one-sectional view.

FIG. 3 is a sectional front view showing a main part of a conventional door closer.

FIG. 4 is a sectional front view showing a main part of a conventional door closer in use.

FIG. 5 is a sectional front view showing a main part of a conventional door closer in use.

FIG. 6 is a sectional plan view showing a main part of a conventional door closer.

FIG. 7 shows a main part of the conventional door closer in use, wherein (a), (c), and (e) are front views, (b),
(D) and (f) are PP of (a), (c) and (e), respectively.
Line end view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Door closer main body, 5 ... Air, 9 ... Piston head, 11 ... Piston internal space (2nd fluid chamber), 14 ... Front oil chamber (1st fluid chamber), 16 ... Spring accommodating space (3rd fluid chamber), 19: adjustment flow path, 21: adjustment valve, 28: fluid hole (passage opening)

Claims (1)

(57) [Claims] A piston head (9) is installed in a fluid chamber of a door closer body (1), and the piston head (9) is provided.
A first fluid chamber (14) and a second fluid chamber (11) communicating with each other via an adjustment channel (19) are formed on both sides of the adjustment channel (19). The adjustment flow path (19)
In a door closer provided with an adjusting valve (21) for adjusting a moving speed of a piston head (9) by adjusting a flow rate of a fluid flowing in the inside, the door closer main body (1) is connected to the door closer main body through a communication passage. A third fluid chamber (16) communicating with the fluid chamber is provided, the fluid chamber and the third fluid chamber (16) are filled with a fluid, and the third fluid chamber (16) is filled with a fluid. A predetermined amount of air (5) is mixed to absorb the pressure increase in the chamber and the third fluid chamber (16), and the air (5) in the third fluid chamber (16) is added to the fluid chamber. A door closer characterized in that a passage opening (28) of the communication passage on the third fluid chamber (16) side protrudes toward the third fluid chamber (16) so as to prevent entry.