JPH0611353Y2 - Cam type damper mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a damper mechanism for a door closer, and more particularly to a cam type damper mechanism using a cam.

[Conventional technology]

Conventionally, as one of damper mechanisms for door closers,
A cam type damper mechanism as shown in the figure is known. That is, the cam type damper mechanism is fixed to, for example, the cylinder 100 attached to the frame (not shown) side, the shaft 101 attached to the door (not shown) side, and the cylinder chamber 100a side in the cylinder 100. First cam 104 and shaft 1
The second cam 102, which is fitted to one end side of 01, presses against the first cam 104 by the elastic force of the spring 103 in the cylinder chamber 100b. And
In this cam type damper mechanism, the second cam 102 is lifted by the cam surface (lower surface) of the first cam 104 against the elastic force of the (compression) spring 103 as the shaft 101 rotates when the door is opened, for example. . On the other hand, when closed, the shaft 10
The second cam 102, which rotates with the rotation of 1, descends along the cam surface (lower surface) of the first cam 104 against the restoring force (elastic force) of the spring 103. 10
A check valve (not shown) provided in 2 brakes the descending speed of the second cam 102.

[Problems to be solved]

However, in the cam type damper mechanism having such a configuration, the elasticity of the spring 103 is increased when the door is opened quickly or the viscous resistance of the damper oil increases due to low ambient temperature. The rise of the second cam 102 due to the force is delayed and the second cam 102 cannot come into contact along the cam surface of the first cam 104. In other words, a predetermined braking force may not be obtained at the time of closing, and a reliable operation may not be obtained. is there.

Further, in the cam type damper mechanism having such a configuration,
If the door side is opened by a certain angle and then the force of the hand or the wind is applied, for example, the door may become larger and may open suddenly, which is a problem.

Therefore, in view of the above-mentioned conventional drawbacks, the present invention has an object to provide a cam type damper mechanism capable of surely performing a predetermined operation even when an external force is applied to the door side.

[Means for solving problems]

That is, the present invention relates to the first cam and the second cam fixed to the upper side and the lower side in the cylinder and the lower surface of the first cam when the shaft side or the cylinder side rotates within a certain angle until the door is closed. The first sloped surface for braking the rotational movement of the shaft side or the cylinder side while pressingly contacting the provided first braking surface and the first sloped surface when the shaft side or the cylinder side rotates beyond a certain angle when the door is opened. A second sloped surface for braking the rotational movement of the shaft side or the cylinder side of the second braking surface provided on the lower surface of the cam while press-contacting the second braking surface. The second sloped surface is serrated with the shaft to rotate integrally with the shaft. 3rd cam to do and these 1st
A fluid filled and sealed in the cylinder between the cam and the third cam and in the cylinder between the second cam and the third cam;
It is provided inside the third cam and is opened to allow passage of the fluid in the cylinder between the first cam and the third cam when the door is opened up to a certain angle, and is fixed until the door is closed. A check valve that closes to prevent passage of fluid in the cylinder between the second cam and the third cam during the closing operation within an angle and the closing operation over a certain angle, and the check valve. When the valve is closed, the flow amount of the fluid in the cylinder between the second cam and the third cam when it flows into the cylinder between the first cam and the third cam is adjusted by the speed control rod. And a valve seat having a passage for adjusting rotation of the shaft or cylinder by braking.

[Action]

In the cam type damper mechanism of this invention, while the third cam attached to the shaft side is regulated by the braking force by the fluid pressure,
Further, it rotates while being regulated to slide along the sloped surfaces of the first and second cams that are fixed to the cylinder side and sandwich the third cam from above and below, in other words, the third cam does not rotate idly and is surely rotated. It is capable of performing a predetermined operation.

Further, the cam type damper mechanism of the present invention, for example, when the shaft is rotated within a certain angle range until the door is completely closed, the first cam of the third cam that rotates together with the shaft is rotated.
When the inclined surface descends while being in pressure contact with the first braking surface of the first cam and the fluid in the cylinder between the second cam and the third cam passes through the passage of the third cam, the passage amount is controlled. The rotation of the shaft side can be braked.

Further, in the cam type damper mechanism of the present invention, for example, when the shaft is rotated over a certain angle to open the door by a certain angle or more, the second sloped surface of the third cam that rotates together with the shaft causes the first cam to rotate. When the fluid in the cylinder between the second cam and the third cam passes through the valve passage of the third cam while coming into pressure contact with the second braking surface of the third cam, the passage amount is controlled to rotate the shaft side. The operation is designed to be braked.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a cam type damper mechanism according to the present invention. This cam type damper mechanism constitutes a door closer together with a door closing mechanism (not shown), and a first cam 2 fixed to the cylinder 1 side. And a second cam 3 and a third cam 5 which rotates integrally with the shaft 4 fitted on the shaft 4 side,
It is composed of a fluid 6 filled and sealed in the cylinder 1.

The cylinder 1 has a substantially cylindrical shape and is attached to the door frame (not shown) side, and accommodates the first cam 2, the second cam 3 and the third cam 5 in an internal cylinder chamber.

The first cam 2 is shown in FIG. 2 (however, FIG. 2 shows a state when the shaft (door) is rotated (opened) by 30 °).
Thus, the lower surface side has the first braking surfaces 2a and 2b and the second braking surfaces 2c and 2d. In the first cam 2 of this embodiment, the third cam 5 side (that is, the shaft 4) is closed until the first braking surfaces 2a and 2b are completely closed.
(2) When the door is opened at a fixed angle, that is, at 120 degrees, the second braking surface 2c, 2d is opened within a range of 180 degrees while braking the rotational movement in the range of 0 to 120 degrees. Moreover, the rotational movement of the third cam 5 side (that is, the shaft 4 side) is braked. Then, as shown in FIG. 3, the central portion of the first cam 2 is moved to a third position by fluid pressure.
Mechanism for braking the cam 5 (check valve mechanism)
Part of is formed. That is, in this first cam 2,
The shaft 4 is fitted in a rotatable state.

The second cam 3 and the first cam 2 always sandwich the third cam 5 from above and below. More specifically,
First and second slope surfaces 5a to 5d described after the third cam 5
From the lower side so that the third cam 5 comes into pressure contact with the first braking surface 2a, 2b or the second braking surface 2c, 2d of the second cam 2.
As shown in FIG. 2, the first pushing surfaces 3a and 3b and the second pushing surfaces 3c and 3 are provided on the upper surface side thereof.
d and.

The shaft 4 is attached to the door (not shown) side, and is attached so as to be vertically movable on the center side of the third cam 5 by serration engagement or the like.

The third cam 5 is inserted between the first cam 2 and the second cam 3, and has a first sloped surface 5a, 5b and a second sloped surface on the upper surface side thereof.
It has slope surfaces 5c and 5d. On the central side of the third cam 5, a check valve mechanism already proposed by the applicant, that is, as shown in FIG.
A valve passage 7 through which a fluid 6 such as oil flows in and out and a valve seat 9 provided with a check valve 8 are attached. Further, a speed control rod 10 penetrates through the center of the valve seat 9 on the side of the passage 9a. The fluid 6 is enclosed between the cams in the cylinder 1.

Next, the operation of the cam type damper mechanism of this embodiment will be described.

(1) When the door opens up to 120 ° The third cam 5 on the shaft 4 side rotates with the opening operation of the door, and as shown in FIG. 4, the first pushing surface 3 of the second cam 3 is moved.
While being pushed by a and 3b, the first sloped surfaces 5a and 5b become the first
The cam 2 rises in pressure contact with the first braking surfaces 2a, 2b. Then, at this time, the fluid in the cylinder 1 between the first and third cams 2 and 5 pushes the check valve 8 from the valve passage 7 and opens the check valve 8.
It flows into the cylinder 1 between the cams 3 and 5.

(2) When the door opens beyond 120 ° to 180 ° When the door opens, the third cam 5 on the shaft 4 side rotates, and when the shaft 4 side further rotates from the state shown in FIG. 5, this time. As shown in FIG. 6, while being pushed by the second pushing faces 3c, 3d of the second cam 3, the second slope faces 5c, 5d are pushed.
Is lowered while being in pressure contact with the second braking surfaces 2c, 2d of the first cam 2, so that a large braking force acts on the shaft 4 side thereof and can be prevented from being suddenly released due to wind. That is, at this time, the fluid 6 is in the space compressed in the cylinder 1 between the second and third cams 3 and 5,
An attempt is made to flow into the cylinder 1 between the first and third cams 2 and 5 from the passage 9a of the valve seat 9, but since the flow is restricted by the adjusting rod 10, a predetermined braking force acts on the shaft. To do.

(3) When the door is closed from 180 ° to 120 ° While the door is being closed, the third cam 5 on the shaft 4 side is rotated and pushed by the second pushing surfaces 3c and 3d of the second cam 3. The second slope surfaces 5c and 5d are the first braking surface 2 of the first cam 2.
Presses against c and 2d and rises. Then, at this time, the fluid 6 compressed in the cylinder 1 between the first and third cams 2 and 5 pushes the check valve 8 from the valve passage 7 and opens the cylinder between the second and third cams 3 and 5. It flows into 1.

(4) From the state where the door is opened by 120 ° until it is closed The third cam 5 on the shaft 4 side rotates with the closing operation of the door, and when the shaft 4 side further rotates from the state shown in FIG. As shown in, the first pushing surface 3 of the second cam 3
While being pushed by a and 3b, the first sloped surfaces 5a and 5b become the first
The cam 2 comes into pressure contact with the first braking surfaces 2a, 2b and descends. Therefore, as in the case of the second stage, a predetermined braking force acts on the shaft 4 side, and the door does not close at high speed even if it is strongly pressed by the hand, for example.

〔effect〕

As described above, according to the cam type damper mechanism of the present invention, the third cam attached to the shaft side is inserted between the first and second cams fixed to the cylinder side, and the third cam is fixed from the vertical direction. Since the pivotal movement is restricted, when it is used in a door closer together with a door closing mechanism, for example, the movement of the door and the movement of the third cam can be matched well with respect to changes in the external environment. We can provide high price.

Further, when the cam type damper mechanism according to the present invention is used in a door closer together with a door closing mechanism, for example, when the door is opened by a certain angle or more, the rotational movement of the third cam is braked by the fluid pressure. Therefore, it is possible to prevent the door from being suddenly opened and closed by being blown by the wind.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a cam type damper mechanism according to the present invention, FIG. 2 is a development view showing first to third cams according to the present invention, and FIG. Sectional views of such a cam type damper mechanism, FIGS. 4 to 6 are development views for explaining the operation of the cam type damper mechanism according to the present invention, and FIG. 7 is a configuration diagram showing a conventional type cam type damper mechanism. Is. 1 ... Cylinder, 2 ... First cam, 2a, 2b ... First braking surface, 2c, 2d ... Second braking surface, 3 ... Second cam, 4 ... Shaft, 5 ... Third cam , 5a, 5b ... first slope surface, 5c, 5d ... second slope surface, 6 ... fluid, 7 ... valve passage, 8 ... check valve, 9 ... valve seat, 9a ... passage, 10 ... speed control rod.

Claims (1)

[Scope of utility model registration request] 1. A first cam (2) and a second cam (3) fixed to an upper side and a lower side of a cylinder (1) and a shaft (4) side or a cylinder within a constant angle until the door is closed. When the (1) side rotates, the rotation operation of the shaft (4) side or the cylinder (1) side is braked while being in pressure contact with the first braking surface (2a, 2b) provided on the lower surface of the first cam (2). Second slope provided on the lower surface of the first cam (2) when the shaft (4) side or the cylinder (1) side rotates beyond a certain angle when the door is opened and the first sloped surface (5a, 5b) for A second sloped surface (5c, 5d) for braking the rotational movement of the shaft (4) side or the cylinder (1) side while being pressed against the surface (2c, 2d). It is engaged with serrations and rotates integrally with the shaft (4). Between the third cam (5) and the inside of the cylinder (1) between the first cam (2) and the third cam (5) and between the second cam (3) and the third cam (5). Fluid (6) filled and sealed in the cylinder (1)
And the fluid (provided inside the third cam (5)) between the first cam (2) and the third cam (5) in the cylinder (1) when the door is opened to a certain angle. 6) is the second cam (3)
And the third cam (5) are allowed to move, and inside the cylinder (1) during the door closing operation within a certain angle until the door is closed and the door opening operation exceeding the certain angle. Closed to prevent the fluid (6) between the second cam (3) and the third cam (5) from passing between the first cam (2) and the third cam (5). The check valve (8) and the second cam (3) and the third cam when the check valve (8) is closed.
Fluid (6) in cylinder (1) between cam (5)
Is adjusted on the shaft (4) side or the cylinder () by adjusting the passing amount when the gas flows into the cylinder (1) between the first cam (3) and the third cam (5) by the speed control rod (10). 1) A valve seat (9) having a passage (9a) for braking the rotational operation of the cam type damper mechanism.