JP6711712B2 - Speed control valve for door closer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a speed control valve for a door closer used in a door closer (door self-closing device) that slowly and automatically closes an opened door.

Generally, a door closer includes a housing having a sealed space filled with hydraulic oil, and a piston urged by a coil spring is reciprocally arranged in the sealed space of the housing. A rack and pinion mechanism is attached to the piston, and a rotary shaft is connected to the pinion of the rack and pinion mechanism so as to penetrate the upper and lower housings. Further, one end of a link mechanism is connected to the upper end of the rotary shaft, and the other end of the link mechanism is connected to the upper frame side of the door opening of the building.

When the door is opened, the rotational movement is transmitted to the rotary shaft via the link mechanism, and is converted into the linear movement of the piston via the rack and pinion mechanism. As a result, the piston moves in the closed space of the housing to compress the coil spring, and when the hand is released from the door, the repulsive force of the compressed coil spring causes the door to slowly and automatically close. There is. The closing speed of the door is adjusted by controlling the flow rate of the hydraulic oil flowing in conjunction with the movement of the piston with the speed adjusting valve.

By the way, a door equipped with such a door closer does not flow smoothly even if an external force in the closing direction is applied to the door to forcefully close it while the door closer is slowly and automatically closing the door. Is controlled by the speed control valve and is constant, so it cannot be forcibly closed.

Therefore, as disclosed in Patent Document 1 below, a configuration is known in which a relief valve that is opened and closed according to the internal pressure of hydraulic oil is provided in the housing. According to this configuration, when an external force in the closing direction is applied to the door in order to forcibly close the door, the relief valve is opened and the working oil also flows into the flow passages other than the speed control valve. There are known configurations that can be forcibly closed.

Further, as disclosed in Patent Document 2 below, a door is forced in a backcheck section in which a backcheck speed adjusting valve and a relief valve are combined to control the speed in the opening direction of the door to prevent a sudden opening. A configuration that can be opened automatically is also known.

However, these configurations are not easy to assemble, because it is necessary to arrange multiple components of the relief valve in the housing and to provide a dedicated flow path for that in advance in the housing, and it is applicable to existing door closers. There is a problem that you can not do it.

Japanese Patent No. 4864944 JP-A-7-4134

Therefore, an object of the present invention is to provide a speed adjusting valve for a door closer, which has been made in view of the above conventional problems and which is excellent in assemblability and which can be applied with a forced opening/closing function even in an existing door closer.

A housing having a sealed space filled with hydraulic oil, a piston that is reciprocally movable in the sealed space while being biased by a piston biasing means, and divides the sealed space into a high pressure chamber and a low pressure chamber; A piston moving mechanism for moving the piston, and a door closer for controlling the opening/closing speed of the door by adjusting the flow rate of the hydraulic oil flowing from the high pressure chamber to the low pressure chamber in conjunction with the movement of the piston. In the used door closer speed adjusting valve, the door closer speed adjusting valve is inserted and attached to the housing having a shaft portion in which a passage for hydraulic oil flowing from the high pressure chamber to the low pressure chamber is formed. Furthermore, while the high pressure chamber and the low pressure chamber are shut off in normal times, the high pressure chamber is controlled when an external force in the controlling direction acts on the door while controlling the opening/closing speed of the door. And a coil spring for urging the ball in a direction to shut off the high pressure chamber and the low pressure chamber as a relief valve for communicating hydraulic fluid in the high pressure chamber to the low pressure chamber by communicating with the low pressure chamber. And a holding means arranged inside the passage for holding the ball and the coil spring inside the passage, so that the relief valve is integrally provided inside the speed adjusting valve for the door closer. It is characterized by being

Further, it is preferable that the biasing force of the coil spring can be adjusted by moving the holding means in the axial direction.

Furthermore, it is preferable that the speed control valve for the door closer is a delayed action speed control valve used to close a certain section very slowly when closing the door.

As described above, the speed control valve for the door closer according to the present invention has the relief valve integrally provided inside the speed control valve for the door closer, so that it is excellent in assemblability and forcibly opens and closes the existing door closer. Functions can be applied.

The front view of the state which attached the door closer using the speed control valve for door closers of the embodiment of the present invention to a door is shown. The schematic sectional drawing in the cross section CC of FIG. 1 is shown. The side view in the arrow D of FIG. 2 is shown. FIG. 4 is a schematic cross-sectional view of the vicinity of a delayed action speed control valve taken along the line EE in FIG. 3, showing a state where the door is in a delayed action section.

Hereinafter, the speed control valve according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, 101 indicates a door opening of a building, and the door opening 101 is composed of a space surrounded by a rectangle by an upper frame 102, a pair of left and right vertical frames 103, and a lower frame (not shown). A door 104 is attached to one vertical frame 103 via a hinge (not shown) so that the door opening 101 can be opened and closed. The door 104 is designed to be slowly and automatically closed from the open state by the door closer 1.

The door closer 1 is a parallel type that opens to the right (right hand) and includes a door closer body 2. The door closer body 2 includes a housing 3 having a closed space 3a (see FIG. 2) filled with hydraulic oil (not shown), and the housing 3 is attached to the upper end of the door 104 by a metal fitting (not shown).

As shown in FIG. 2, inside the housing 3 (closed space 3a), the piston 4 is arranged so as to be capable of reciprocating while being biased rightward in FIG. Is partitioned by the piston 4 into a high pressure chamber A (small region on the right side of FIG. 2) and a low pressure chamber B (large region on the left side of FIG. 2). In FIG. 2, reference numeral 6 denotes a pair of left and right end plugs. These end plugs 6 are fitted into the fitting hole 3b by screwing the outer peripheral male screw portion 6a into the female screw portion 3c of the fitting hole 3b of the housing 3. It is worn. The coil spring 5 corresponds to the piston urging means of the present invention.

A hollow portion 4a is formed inside the piston 4, and the hollow portion 4a communicates with the high pressure chamber A via the first passage 7 and also communicates with the low pressure chamber B via the second passage 8. A check valve 9 for controlling the flow of hydraulic oil is installed on the high pressure chamber A side of the first passage 7, and the high pressure chamber A and the low pressure chamber B are connected and disconnected by the check valve 9. That is, the hollow portion 4a constitutes a part of the low pressure chamber B. The check valve 9 includes a valve body 10, a ball housing portion 10a is formed in the valve body 10, and a ball 11 is movably housed therein. When the door is closed, the check valve 9 presses the ball 11 against the inner wall of the ball accommodating portion 10a communicating with the first passage 7 by the inner pressure of the high pressure chamber A to close the first passage 7 and close the high pressure chamber A side. The hydraulic oil is prevented from flowing out to the low pressure chamber B side.

A rack and pinion mechanism 12 is incorporated in the hollow portion 4 a of the piston 4. The rack and pinion mechanism 12 includes a rack 13 formed in the hollow portion 4a and a pinion 14 that meshes with the rack 13 so that the rotary shaft 15 can vertically penetrate the housing 3 in the pinion 14. Is linked to. In FIG. 1, reference numeral 16 is a cup that covers the lower end of the rotary shaft 15. The rack and pinion mechanism 12 corresponds to the piston moving mechanism of the present invention.

One end of a link mechanism 30 is connected to the upper end of the rotary shaft 15. The other end of the link mechanism 30 is connected to the upper frame 102 side of the door opening 101 of the building. Specifically, the link mechanism 30 includes a main arm 31 and a connecting arm 32, one end of the main arm 31 is connected to the upper end of the rotating shaft 15, and the other end of the main arm 31 has one end of the connecting arm 32. Are rotatably connected around a shaft 33. On the other hand, a base end of a stay (triangular plate) 34 is attached to the upper frame 102 of the door opening 101, and the other end of the connecting arm 32 is connected to the tip of the stay 34 rotatably around a shaft 35. ing.

Further, three speed adjusting valves (not shown) are attached to the side wall 17 of the housing 3 so as to face a flow path (not shown) connecting the high pressure chamber A and the low pressure chamber B of the closed space 3a. In addition, the closing speed of the door 104 is adjusted by controlling the flow rate of the working oil flowing in the closed space 3a in conjunction with the movement of the piston 4.

Further, as shown in FIG. 3, a delayed action speed adjusting valve 40 is attached to the side wall 17 of the housing 3 outside the end plug 6. As shown in FIG. 4, a plus-type engagement groove 40a into which an operation tool such as a driver is inserted and engaged is formed on the end surface of the base end portion of the delayed action speed control valve 40. The delayed action speed control valve 40 has a shaft shape that extends from the base end portion toward the tip end with a male screw portion 40b and a shaft portion 40c. The delayed action speed adjusting valve 40 corresponds to the speed adjusting valve for a door closer of the present invention.

Inside the tip end side of the shaft portion 40c, a first communication passage 40e extending rearward in the axial direction from the tip end of the shaft portion 40c, and a diameter smaller than the first communication passage 40e are provided in the rearward axial direction. And a second communication passage 40f extending in the direction. Further, a through passage 40g orthogonal to the second communication passage 40f is formed in the shaft portion 40c, and the through passage 40g communicates with the end portion of the second communication passage 40f.

The shaft portion 40c has a sliding shaft portion 40d on the tip side thereof. The outer diameter of the sliding shaft portion 40d is smaller than the other portion of the shaft portion 40c (the portion other than the sliding shaft portion 40d). An elongated flow rate adjusting groove 40h is formed on the peripheral surface of the sliding shaft portion 40d so as to communicate with the first communication passage 40e. A female screw portion 40i is provided on the inner periphery on the tip side of the first communication passage 40e.

A ball 51, a coil spring 52, and a plug 53 are provided as a relief valve 50 inside the first communication passage 40e. The ball 51 is pressed by an urging force of the coil spring 52 against an inner wall formed in a communication portion between the first communication passage 40e and the second communication passage 40f, and is arranged so as to block the flow of the hydraulic oil. The plug 53 has a male screw portion 53a on the outer periphery and is screwed into the female screw portion 40i of the first communication passage 40e so as to hold the ball 51 and the coil spring 52 inside the first communication passage 40e. It is arranged. That is, the relief valve 50 is integrally provided inside the delayed action speed adjusting valve 40. The plug 53 corresponds to the holding means of the present invention.

The plug 53 has a hexagonal through hole 53b, and hydraulic oil can move through the hexagonal through hole 53b. By inserting an operating tool such as a hexagonal wrench into the hexagonal through hole 53b to move the plug 53 axially in the axial direction to move the plug 53 and change its position in the axial direction, the biasing force of the coil spring 52 against the ball 51 is increased. Can be increased or decreased, and the force required to open the relief valve 50 can be adjusted.

As shown in FIG. 4, the insertion hole 18 into which the delayed action speed control valve 40 is inserted communicates with the high pressure chamber A through the third passage 18a. The insertion hole 18 communicates with the low pressure chamber B via the fourth passage 18b and a flow path (not shown). On the inner wall of the insertion hole 18, a female screw portion 18c with which the male screw portion 40b of the delayed action speed adjusting valve 40 is screwed is formed.

When the delayed action speed adjusting valve 40 is inserted into the insertion hole 18 and the male screw portion 40b is screwed into the female screw portion 18c, a gap is formed around the shaft portion 40c of the insertion hole 18, and There is no gap around the moving shaft portion 40d. In this state, the third passage 18a and the fourth passage 18b are connected to each other through the gap formed around the shaft portion 40c, the flow rate adjusting groove 40h, the first communication passage 40e, and the hexagonal through hole 53b. Communicate with each other. As a result, the high pressure chamber A and the low pressure chamber B communicate with each other, so that the delayed action speed adjusting valve 40 is axially screwed back and forth with an operating tool such as a screwdriver to change the position of the flow amount adjusting groove 40h to change the position of the flow amount adjusting groove 40h. It is possible to adjust the closing speed of the door 104 by changing the flow passage area and controlling the flow rate of the working oil flowing from the high pressure chamber A to the low pressure chamber B in conjunction with the movement of the piston 4.

Further, the passage formed by the gap formed around the shaft portion 40c, the through passage 40g, the second communication passage 40f, the first communication passage 40e, and the hexagonal through hole 53b is a relief valve 50 in normal times. The flow of hydraulic oil is blocked by. At this time, when an external force is applied to the door 104 in the closing direction and a force equal to or greater than the biasing force of the coil spring 5 is applied, the internal pressure of the hydraulic oil in the high pressure chamber A increases, and the pressure on the second communication passage 40f side increases. The ball 51 moves to the left in FIG. 4 beyond the biasing force of the coil spring 52, and the second communication passage 40f and the first communication passage 40e communicate with each other, whereby the relief valve 50 is opened.

Further, in the delayed action section in which the flow rate of the hydraulic oil is controlled via the delayed action speed adjustment valve 40, all the other three speed adjustment valves (not shown) are closed. Therefore, when the relief valve 50 is closed, the hydraulic oil flows out only from the flow rate adjusting groove 40h of the delayed action speed adjusting valve 40, so that the door 104 is closed very slowly in this section.

Next, the operation of the speed control valve according to the embodiment of the present invention having the above configuration will be described.

When the door 104 is operated to be opened, the rotational movement thereof is transmitted to the rotary shaft 15 via the link mechanism 30, and the rotary shaft 15 rotates. As a result, the pinion 14 rotates clockwise in FIG. 2, and the piston 4 linearly moves in the closed space 3a of the housing 3 in the leftward direction in FIG. 2 while compressing the coil spring 5 via the rack and pinion mechanism 12. As a result, the hydraulic oil in the low pressure chamber B flows into the ball housing portion 10a through the second passage 8, the hollow portion 4a and the first passage 7 and moves the ball 11 to the high pressure chamber A side to open the first passage 7. , Outflow into the high pressure chamber A. The door 104 is opened while accumulating the force of moving in the closing direction.

When the hand is released from the door 104, the compressed coil spring 5 expands due to its repulsive force, and the piston 4 linearly moves in the closed space 3a of the housing in the right direction in FIG. At this time, the first passage 7 is closed by the balls 11 of the check valve 9 being pressed against the inner wall of the ball housing portion 10a by the internal pressure of the high pressure chamber A, so that the hydraulic oil in the high pressure chamber A is discharged from the first passage 7. It does not flow out to the low pressure chamber B, but flows out to the low pressure chamber B via the delayed action speed control valve 40. The pinion 14 rotates counterclockwise in FIG. 2, the rotational force of the rotating shaft 15 is transmitted to the link mechanism 30, and the door 104 slowly and automatically closes.

When the door 104 is in the delayed action section in which a certain section is closed very slowly during closing, if an external force in the closing direction is manually applied to the door 104 to forcefully close the door 104, the hydraulic oil in the high pressure chamber A is Internal pressure increases. Then, a force to the left in FIG. 4 is applied to the ball 51 via the through passage 40g of the delayed action speed control valve 40 communicating with the high pressure chamber A and the second communication passage 40f. When the internal pressure of the high pressure chamber A exceeds the urging force of the coil spring 52, the second communication passage 40f and the first communication passage 40e, which were blocked by the ball 51, communicate with each other and the relief valve 50 is opened. When the relief valve 50 is opened, the hydraulic oil also flows into the low pressure chamber B from other than the flow rate adjusting groove 40h, and the door 104 can be forcibly closed.

If the door 104 is released and the external force in the closing direction is released while the relief valve 50 is open, the internal pressure of the high-pressure chamber A decreases, the urging force of the coil spring 52 prevails, and the passage 40f and the passage 40e are separated. It is blocked by the ball 51, and the operating oil returns to a state where it flows out to the low pressure chamber B only from the flow rate adjusting groove 40h.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiment added with such changes or improvements can be included in the technical scope of the present invention.

For example, in the above-described embodiment, the holding means that holds the ball 51 and the coil spring 52 inside the first communication passage 40e is the plug 53 including the hexagonal through hole 53b, but the holding means is not limited to this. The holding means may be any one that is located in the first communication passage and can hold the ball 51 and the coil spring 52 inside the first communication passage 40e and move the hydraulic oil.

Further, in the above-described embodiment, the relief valve 50 is provided in the delayed action speed adjusting valve 40, but the speed is suddenly opened by controlling the speed of three speed adjusting valves (not shown) and the opening direction of the door. It can also be applied to a back check speed control valve that prevents the above. That is, any speed adjustment valve that controls the opening/closing speed of the door can be applied to any of them.

1: Door closer 2: Door closer body 3: Housing 3a: Sealed space 3b: Fitting hole 3c: Female screw part 4: Piston 4a: Cavity part 5: Coil spring 6: End plug 6a: Male screw part 7: First passage 8: Second passage 9: Check valve 10: Valve main body 10a: Ball accommodating portion 11: Ball 12: Rack and pinion mechanism 13: Rack 14: Pinion 15: Rotating shaft 17: Side wall 18: Insertion hole 18a: Third passage 18b : Fourth passage 18c: female screw portion 30: link mechanism 31: main arm 32: connecting arm 34: stay 40: delayed action speed adjusting valve (speed adjusting valve for door closer)
40a :engagement groove 40b :male screw part 40c :shaft part 40d :sliding shaft part 40e :first communication passage 40f :second communication passage 40g :through passage 40h :flow rate adjusting groove 40i :female screw portion 41 :O ring 50: Relief valve 51: Ball 52: Coil spring 53: Plug (holding means)
53a: Male screw part 53b: Hexagonal through hole 101: Door opening part 102: Upper frame 103: Vertical frame 104: Door A: High pressure chamber B: Low pressure chamber

Claims (3)

A housing having a closed space filled with hydraulic oil,
A piston which is arranged in the closed space so as to be capable of reciprocating in a state of being biased by a piston biasing means, and which partitions the closed space into a high pressure chamber and a low pressure chamber;
A piston moving mechanism for moving the piston,
In a speed control valve for a door closer used in a door closer that controls the opening/closing speed of a door by adjusting the flow rate of hydraulic oil flowing from the high pressure chamber to the low pressure chamber in conjunction with the movement of the piston,
The door closer speed adjusting valve has a shaft portion in which a passage through which hydraulic oil flowing from the high pressure chamber to the low pressure chamber flows is formed, and is attached to the housing.
During normal times, the high-pressure chamber and the low-pressure chamber are shut off, and when an external force in the controlling direction acts on the door while controlling the opening/closing speed of the door, the high-pressure chamber and the low-pressure chamber are separated from each other. A ball, a coil spring for urging the ball in a direction to shut off the high pressure chamber and the low pressure chamber, and a ball as a relief valve for communicating hydraulic fluid in the high pressure chamber to the low pressure chamber. The relief valve is integrally provided inside the speed adjusting valve for the door closer by providing a holding means arranged inside the passage so as to hold the coil spring inside the passage. A speed adjustment valve for a door closer. 2. The speed adjusting valve for a door closer according to claim 1 , wherein the biasing force of the coil spring can be adjusted by moving the holding means in the axial direction. 3. The door closer according to claim 1 or 2, wherein the speed control valve for the door closer is a delayed action speed control valve used for very slowly closing a certain section when closing the door. Speed control valve.

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