JP2567305B2 - Back check and closing delay device in door closer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a polymer viscous fluid, other viscous fluid, and a spring, and when the door is automatically closed by the restoring force of the spring, the viscous fluid is used. A large braking force can be applied to the door based on the resistance force of the door, so that not only can the door be closed slowly but also the wind pressure due to strong wind in the opening direction of the door and the artificial opening of the door forcefully. If an overload occurs due to external force, etc., a back check operation that further applies braking force acts on the door, causing the door to open suddenly, causing damage, etc. The purpose is to prevent the occurrence of.

[0002]

2. Description of the Related Art As a conventional door closer, a hydraulic cylinder provided in a horizontally long body case is internally provided with a piston for interposing a return spring, and a rack is formed on one side wall of the piston. Correspondingly, it is widely known that one side of a cylinder is engaged with a pinion rotatably supported by a pinion shaft.

[0003]

However, even in the above-mentioned door closer, a back check operation area and a delayed action operation area which is slowly closed for a person trying to pass by a wheelchair or the like are provided. However, if the door is opened or closed abruptly and with a strong force, or if a load is applied to the door due to strong wind blowing in the opening or closing direction, etc. The opening and closing speed suddenly increases, which may cause physical disabilities and danger to the passage of wheelchairs, the elderly, children, etc., and at that time, an unpleasant squeak noise is generated due to the collision between the rack and the pinion. Even when the door is damaged or the door is not loaded by an external force, the door closing speed is set so high that it cannot be used by people in a wheelchair. It has a problem point.

The present invention has been made in view of the above problems of the conventional door closer, and when the load due to an external force is not applied to the door within the range of the maximum opening angle from the closed position. In either case, a large braking force is maintained so that the door is always closed at a slow speed for people passing by a wheelchair, and an external force is applied in the door opening direction. When a load due to is applied, the pressure due to the viscous fluid,
By utilizing the relative relationship with the force of the spring that biases the control valve, the braking force is automatically adjusted to increase, and when the normal load condition is restored, the braking force is immediately demodulated to a steady value. The objective is to obtain an ideal door closer with a simple structure in which an excessive force is not applied to the components due to overload when the door is opened.

[0005]

In order to achieve the above object, the present invention defines a pair of chambers in a casing whose upper end is sealed by a lid, by a rotary shaft pivotally supported at the center thereof. , A pair of rotary blades projecting from the rotary shaft so as to be divided into a high-pressure chamber and a low-pressure chamber, are rotatably mounted inside, and filled with a viscous fluid, In a door closer that can be biased by a return spring in the rotational direction, the high pressure chamber and the low pressure chamber of the pair of chambers are connected to each other through narrow passages, and the casing is used for back check and delayed action. Both adjusting screws, in a wide communication passage that communicates one high-pressure chamber and the other low-pressure chamber in the pair of chambers, each control valve is movable, and in the back-check adjustment screw, That The node valve is screwed by urging it with an adjusting spring in the direction opposite to the valve seat, and a pair of variable passages are formed between each valve seat of the communication passage and each of the adjusting valves. The passages are automatically adjusted so that they can be opened and closed and opened and closed by the reaction of the control valve by the force relationship between the pressure of the viscous fluid flowing from the high pressure chamber and the control spring force, and the response of the control valve by the pressure of the viscous fluid. An object of the present invention is to provide a back check and door closing delay device in a door closer characterized by the above.

[0006]

The opening force of the door is applied to the rotary shaft as a rotary force in one direction, so that the rotary shaft and the rotary vanes integrated with the rotary shaft are rotated in the same direction. At this time, the viscous fluid in one high-pressure chamber flows into the other high-pressure chamber and the other low-pressure chamber that are in communication with the high-pressure chamber, and the viscous fluid in the other high-pressure chamber is adjusted for back check in the casing. After flowing into the screw side, it flows into one of the low pressure chambers from the delayed action adjusting screw side. At this time, the restoring force (closing force) is stored in the return spring by the rotation of the rotating shaft. When the door is opened normally, the pressure of the viscous fluid flowing from the other high-pressure chamber into the communication passage is maintained at a steady value, and since the pressure of the viscous fluid is smaller than the force of the adjusting spring, that pressure and the adjusting spring Since the balance of the force relationship with is maintained, the control valve of the back check adjustment screw does not respond. On the other hand, since the adjusting valve of the delayed action adjusting screw is not biased by the spring, it opens in response to the pressure of the viscous fluid, and the above passage is maintained in the fully opened state.
The resistance force (braking force) due to the viscous fluid does not work in the entire opening direction of the door.

However, when the door is overloaded by an external force due to the door being suddenly opened with a strong force, the door being opened in a strong wind, or the like, the pressure of the viscous fluid in the high pressure chamber becomes high. This flows from the other high pressure chamber into the communication passage and is applied to the control valve. Therefore,
When the pressure of the viscous fluid applied to the control valve becomes larger than the force of the control spring, the control spring is compressed, which causes the control valve to respond in the closing direction, and the variable passage between the inner wall surface of the casing and the casing is reduced. Further, as the pressure of the viscous fluid increases, the control valve closes the variable passage, and the flow rate of the viscous fluid in the passage decreases less than in normal times or stops flowing completely, increasing the braking force and increasing the door It exerts an action against the external force, that is, a back check action, and the door opening speed is extremely reduced. When the above-mentioned overload condition is eliminated, the adjustment spring returns the adjustment valve,
Since the above-mentioned passage has a normal size, the door is opened in a normal state.

In the closing direction of the door, the rotating shaft and the rotating blades are rotated in the opposite direction to that when the door is opened by the restoring force stored in the return spring. It becomes a high-pressure chamber, and the viscous fluid in this high-pressure chamber flows into the other high-pressure chamber and both low-pressure chambers, and the viscous fluid in the other high-pressure chamber flows into the communication passage of the casing and flows into the delayed action adjusting screw side. After that, it flows from the back check adjustment screw side which is the other end to one of the low pressure chambers. Therefore, the pressure of the viscous fluid is applied to the adjusting valve of the delayed action adjusting screw, and the adjusting valve responds to close the other variable passage, and the viscous fluid stops flowing in the variable passage, so Only the passage that connects the high-pressure chamber and the low-pressure chambers will flow, but since the passage is formed to be considerably smaller than the communication passage of the casing, the resistance force when viscous fluid flows through this passage. Occurs and this becomes the braking force.

That is, in the door closing direction, the door is slowly closed from the maximum door opening angle by the spring effect and the delayed action effect due to the so-called delayed action effect in which a large braking force is exerted over the entire area. Also, by tightening or loosening the back check adjusting screw and the delayed action adjusting screw, the passage between the valve seat on the inner wall of the casing and the adjusting valve can be made smaller or larger, and the braking force By adjusting the door closing speed, it is possible to arbitrarily adjust it.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2 which is a sectional view taken along the line II-II, a casing 1 having a low and low cylindrical shape is in a syrup state by a lid 2 whose opening at the upper end is fixed by a set screw (not shown). And a mounting seat 1a for mounting the door on a door (not shown) from one side of the outer periphery is integrally formed. Further, the casing 1 has a cylindrical rotation shaft 3 in which a shaft hole (not shown) is recessed in the center of the bottom wall thereof.
, The lower end of which is fitted into the shaft hole through the interposition of a bearing (not shown), and the upper end is rotatable through the shaft hole (not shown) that penetrates the lid 2 and a liquid-tight state through the interposition of a bearing (not shown). Is supported by the rotating shaft 3 and the two projecting portions 4 and 4 opposed to the inner wall surface 1b of the casing 1. 6 are symmetrically defined.

In the illustrated embodiment, the rotary shaft 3 has a pair of rotary vanes 7 and 7 protruding symmetrically in the radial direction.
Are integrally formed, and the rotary vanes 7, 7 are inserted in the pair of chambers 5, 6 so as to be rotatable by a predetermined angle in the circumferential direction. Further, on the rotary shaft 3, a pair of chambers 5, 6 are divided by rotary vanes 7, 7 to form a high pressure chamber 5a,
An upper passage 8 that communicates between the 6a and a lower passage 9 that communicates between the low pressure chambers 5b and 6b are formed so as to penetrate radially and be smaller than a communication passage 10 of the casing 1 which will be described later. The passage 8 and the lower passage 9 are communicated with each other through the communication hole 12 at the axial center portion of the rotary shaft 3, so that the high pressure chamber 5
a, 6a and the low pressure chambers 5b, 6b are in communication with each other. As another means for obtaining such a communication state, it is not shown between the rotary shaft 3 and the pair of rotary blades 7, 8 and the inner wall surface of the casing 1 and the inner wall surfaces of the protruding portions 4, 4 respectively. The gap passages may be formed separately. Reference numeral 11 in the figure indicates a valve seat opening.

Further, the casing 1 has a communication passage 10 formed at one side thereof for connecting the low pressure chamber 5b of the one chamber 5 and the high pressure chamber 6a of the other chamber 6 to each other. The communication passage 10 is located at a base end portion of one protruding portion 4 of the casing 1 and has upper passages 10a and 10a recessed in the back surface of the lid 2 corresponding to the left and right side portions thereof, and the upper passages 1 and 10, respectively.
To the side wall of the casing 1 in communication with the inner ends of 0a and 10a,
Left and right vertically long passages 10b, 10 penetrating vertically to the bottom
b, and both lower longitudinal passages 10b and 10b are formed by a lower passage 10c that is provided so as to communicate with each other at a substantially intermediate portion thereof. The lower ends of the vertical passages 10b and 10b are screw holes 13 and 13, respectively, and a back check adjusting screw 14 and a delayed action adjusting screw 15 are respectively provided in the O-ring 16 in the screw holes 13 and 13. 1
It is liquid-tight via 6 and screwed so as to be movable and adjustable in the vertical direction in FIG.

The back check adjusting screw 14 and the delayed action adjusting screw 15 are provided with a male screw portion 14a,
Valve rods 14b and 15b having a small diameter are extended upward coaxially with 15a, and the valve rods 14b and 15b are provided in the longitudinal passage 10 respectively.
The valve rods 14b and 15b are fitted with disc-shaped control valves 17 and 18 so as to be slidable in the vertical direction. Valve rod 1 of the adjusting screw 14 for back check
4b is inserted into a mounting hole 19 whose upper end is recessed in the back surface of the lid 2 so as to be rotatable and slidable. Further, the adjusting valve 17 of the adjusting screw 14 includes the adjusting valve 17 and the adjusting valve 17.
Between the valve rod 14b and the upward step portion 14c provided at the boundary between the male screw portion 14a, the valve rod 14b is urged upward by the adjusting spring 20 of the exterior. Normally, the spring 20 causes the vertical passage 10b to be extended. Is separated upward from a valve seat 21 provided at the upper end of the casing 1, and between the inner wall surface of the casing 1, that is, between the valve seat 21 and the control valve 17,
The variable passage 22 is opened.

On the other hand, the adjusting valve 18 of the delayed action adjusting screw 15 is not biased by a spring, and is simply moved upward or downward by applying the pressure of the viscous fluid flowing in the communication passage 10. In addition, the control valve 18 is prevented from being detached from the valve rod 15b by the retainer 25 fixed to the tip of the valve rod 15b, and is not slid upward. A variable passage 24 is opened between the control valve 18 and a valve seat 23 provided at the upper end of the vertically elongated passage 10b, and the control valve 18 slides in the vertical direction so that the passage 24 can be opened and closed. Has become. That is, the two variable passages 22 and 24 are
The low pressure chamber 5b of the one chamber 5 and the high pressure chamber 6a of the other chamber 6 are opened through the communication passage 10, and both the variable passages 22 and 24 and the communication passage 10 are opened. It is formed to be considerably larger than the pair of upper and lower passages 8 and 9.

Therefore, the variable passages 22 and 24 can be adjusted to be larger or smaller by screwing or loosening the adjusting screws 14 and 15 to move them up and down, thereby increasing the viscosity. The resistance force by the fluid is adjusted, the braking force is arbitrarily adjusted, and when the door is opened, a strong wind or the like overloads the rotating shaft 3 in the door opening direction.
The pressure of the viscous fluid in the high-pressure chambers 5a, 6a of the pair of chambers 5, 6 becomes high, the fluid flows into the communication passage 10, and the pressure applied to the control valve 17 of the back-check adjusting screw 14 is the adjusting spring. When the force exceeds 20, the adjusting spring 20 is compressed and the adjusting valve 17
However, as shown by the solid line in FIG. 2, it descends and sits on the valve seat 21, the variable passage 22 is closed, the braking force due to the resistance force of the viscous fluid increases, and the back check acts and the overload is eliminated. Then, the adjusting valve 20 is raised by the adjusting spring 20, and the variable passage 22 is automatically returned to the original state by opening.

When the rotating shaft 3 is rotated in the door closing direction by the door closing force, the pressure of the viscous fluid in the low pressure chambers 5b and 6b of the pair of chambers 5 and 6 becomes high, and the fluid is connected to the communication passage 1.
0, and the pressure thereof causes the control valve 18 of the delayed action control screw 15 to descend as shown by the chain double-dashed line in FIG. 2 and seat on the valve seat 23, whereby the variable passage 2
Since 4 is closed, the braking force due to the resistance force of the viscous fluid increases, and the delayed action acts. At this time, the adjusting valve 17 of the back-check adjusting screw 14 is moved up by the adjusting spring 20 as shown by the two-dot chain line in FIG.

Further, as is well known, the casing 1 is internally provided with a return spring (not shown) having one end hooked to a fixed member such as the casing 1 and the other end hooked to a rotary member such as the rotary shaft 3 respectively. When the rotating shaft 3 is rotated in the door opening direction by the door opening force, a restoring force (door closing force) is accumulated in the return spring, and the restoring force closes the door.

FIG. 3 shows another embodiment of the device of the present invention. In this case, the communication passage 1 that connects the low pressure chamber 5b and the high pressure chamber 6a of the pair of chambers 5 and 6 in the casing 1 to each other.
0 has both ends thereof opened in the left and right side walls of the casing 1 and linearly penetrates through, and at the base of one of the protruding portions 4 in the casing 1, each lateral hole 10d opened on both the left and right sides thereof. 10d, the low pressure chamber 5b, the high pressure chamber 6
a and the communication passage 10 are communicated with each other, and the back check adjustment screw 14 and the delayed action adjustment screw 15 are O respectively in screw holes 13 and 13 provided at the left and right ends of the communication passage 10.
It is liquid-tight through the rings 16 and 16 and is screwed so as to be movable in the axial direction. Further, the valve seats 21 and 23 of the control valves 17 and 18, which are slidably mounted on the valve rods 14b and 15b of the two adjusting screws 14 and 15, respectively, are
The adjusting valve 17 of the back-check adjusting screw 14 is formed in the central portion of the communication passage 10 and on both left and right sides thereof.
An adjusting spring 20 for urging the valve seat 21 in a direction opposite to the valve seat 21 is disposed between the adjusting valve 17 and a spring receiver 26 provided at a substantially central portion of the communication passage 10, and each of the valve seats The variable passages 22 and 24 described above are formed between the control valves 21 and 23 and the control valves 17 and 18, respectively, and the other configurations are similar to those in the above-described embodiment.

In the door closer constructed as described above, as shown in FIG. 4, the casing 1 is fixed to the upper portion of the door 27 on the suspension side by the set screw (not shown) with its mounting seat 1a. At the protruding end (not shown) of the rotating shaft protruding outward from the lid 2 of the casing 1, the step screw 28
The other end of the arm 29 having one end fixed thereto and one end of the adjusting arm 30 are rotatably pivoted by a step screw 31 or the like, and the other end of the adjusting arm 30 is attached to the mounting arm 32.
Rotatably and pivotally attached to the upper frame 34a of the door mounting frame 34 by means of a step screw 33 and the like, and a screw 35.
It will be attached to the door 27 by fixing with.

[0020]

Since the present invention is configured as described above, the control valve of the delayed action adjusting screw is moved by the pressure of the viscous fluid at the same time when the door is closed, and the passage is closed to stop the braking force. Is increased and the delayed action effect is exerted, so that not only in the normal state where external force due to strong wind in the closing direction of the door or forced closing etc. is not applied, but also in the case of overload due to external force etc. , The door will always be closed slowly within the range from the maximum opening angle to the closing position.
Therefore, there is no danger of the door closing suddenly, and it is possible to guarantee the safety of persons with physical disabilities, persons in wheelchairs and the elderly, children, and the like.

When the door is being opened and an external force is applied in the opening direction to cause an overload, the pressure of the viscous fluid increases and the pressure is applied to the control valve of the back check adjusting screw. When the pressure becomes greater than the force of the adjusting spring, the adjusting valve moves by compressing the adjusting spring, which reduces the passage between the valve seat and the adjusting valve or closes the passage to reduce the braking force. By increasing the size, the back check function works, eliminating the danger of the door opening suddenly, and preventing damage due to the impact between the door and the wall, and damage caused by excessive force on the mounting arm, mounting bracket, etc. it can.

Further, at the time of closing the door, the operation of closing the passage in the case of overload or closing the passage and the return operation of the passage when the overload disappears are caused by the force of the adjusting spring.
Since it is automatically and instantaneously performed depending on the relationship with the pressure of the viscous fluid, even if the overload is applied at any door opening angle within the door opening angle range, this can be immediately dealt with.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a back check and door closing delay device in a door closer according to the present invention.

FIG. 2 is a vertical sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the device of the present invention.

FIG. 4 is a plan view showing a state where a door is attached using a door closer provided with the device of the present invention.

[Explanation of symbols]

 1 Casing 2 Lid 3 Rotating Shaft 5 Pair of Chambers 6 Pair of Chambers 5a High Pressure Chamber 6a High Pressure Chamber 5b Low Pressure Chamber 6b Low Pressure Chamber 7 Pair of Rotating Blades 10 Communication Passage 14 Back Check Adjustment Screw 15 Delayed Action Adjustment Screw 17 Control Valve 18 Control Valve 20 Control Spring 21 Valve Seat 23 Valve Seat 22 Pair of Variable Passages 24 Pair of Variable Passages

Claims (1)

(57) [Claims] 1. A casing, whose upper end is closed by a lid, is divided into a pair of chambers by a rotary shaft rotatably supported at the center thereof, and these chambers are divided into a high pressure chamber and a low pressure chamber. A door closer in which a pair of rotary blades projecting from the rotary shaft are partitioned so as to be rotatable and filled with viscous fluid, and the rotary shaft is urged by a return spring in one rotation direction. In the above, the high pressure chamber and the low pressure chamber of the pair of chambers are communicated with each other through narrow passages, and the casing has two adjustment screws for back check and delayed action with one of the high pressure chambers of the pair of chambers. In the wide communication passage that communicates with the other low pressure chamber, each control valve can be moved, and the back check adjustment screw is attached with the adjustment spring in the direction opposite to the valve seat. Energize Screwed together to form a pair of variable passages between the valve seats of the communication passages and the adjusting valves, and the variable passages adjust the pressure of the viscous fluid flowing from the high pressure chamber. A back check and closing door in a door closer characterized in that it is automatically adjusted to be wide and narrow and to be opened and closed by the response of the control valve by the force relationship with the spring force and the response of the control valve by the pressure of the viscous fluid. Delay device.