JP3245335B2 - 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 an input for converting a door opening rotation force into a linear motion of a piston, and moving the piston forward so as to accumulate a return force of a coil spring by the opening operation. The present invention relates to a door closer that moves a piston by a returning force of a coil spring, and particularly to a door closing assisting means for assisting a door closing operation until the door is completely closed when various resistances are generated immediately before the door is closed and the door is incompletely closed. And a door closer having the same.

[0002]

2. Description of the Related Art In a conventional hydraulic door closer, as shown in FIG. 4, a piston 3 is inserted into a cylinder chamber formed in a housing 2 to define a front cylinder chamber 2c and a rear cylinder chamber 2d. A coil spring 5 is elastically attached to the front cylinder chamber 2c, and the coil spring 5 urges the piston 3. A main shaft 6 is passed through the piston 3 at right angles and is axially supported by the housing 2. , The spindle 6
Is engaged with the rack 3b formed at the opening edge of the piston 3, and when the door is opened by human power and the main shaft 6 is rotated clockwise when the door is opened, the piston 3 compresses the coil spring 5. The hydraulic fluid in the front cylinder chamber 2c, whose volume is reduced, communicates with the communication hole 3d formed in the piston 3 and the check valve. 3e, it flows to the rear cylinder chamber 2d to guarantee the forward movement of the piston 3. Also, after the door is opened at a certain angle, when a person passes through after the door passes, the coil The piston 3 moves backward by the bias of the spring 5, and at this time, the working fluid in the rear cylinder chamber 2 d whose volume is reduced passes through a fluid passage 3 n having a speed adjusting valve 3 m formed in the piston 3. Flow to the front cylinder chamber 2c So that the can adjust the closing speed with suppressing the backward speed of the piston 3 by.

[0003] The door closer having the above structure is provided with various resistances immediately before the door is closed, specifically, a resistance due to deformation (warpage, distortion) of the movable member, and a door closer to the fitting portion between the door frame and the door. Tight rubber to maintain the airtightness, or contact resistance with the mall to cushion the impact between the door frame and the door, resistance due to the increase in indoor air pressure, or coil of the door closer when air pressure resistance of air conditioning occurs. There is a problem that the door cannot be completely closed only by the returning force of the spring 5. This problem can be solved by using a strong spring for the coil spring 5 because the return force is large even immediately before the door is closed, so that the door can be securely closed. However, not only is it difficult to adjust the closing speed, but also when the door is opened. Since a new problem that a large force is required arises, it cannot be put to practical use.

[0004] In addition, the actual fair 5-3 provided with a guide rail
In a door closer disclosed in Japanese Patent No. 6944, a method using a coil spring for reinforcement in a guide rail can be adopted, but it cannot be used in a door closer having no guide rail.

The present invention has been devised in view of the above points, and when various resistances are generated immediately before the door is closed and the door is incompletely closed, the door closing assist assists the door closing operation until the door is completely closed. to provide a door closer having means
The purpose is.

[0006]

According to the present invention, as a means for solving the above-mentioned problems, a piston 3 is slidably fitted into a cylinder chamber formed in a housing 2 and connected to a door. The main shaft 6 that rotates in conjunction with the rotation of the shaft 3 is axially inserted into the housing 2 so as to be orthogonal to the piston 3,
The pinion 6a provided on the piston 3 and a rack 3b formed on the main shaft 6 is engaged, before the piston 3 is moved forward so as to reduce the front cylinder chamber 2c by the rotation of the door opening direction of the main shaft 6 The coil spring 5 in the lower cylinder chamber 2c is compressed, and the return force of the coil spring 5 causes the piston 3 to return so as to reduce the rear cylinder chamber 2d so that the output shaft 7 rotates in the door closing direction. A rotary encoder 9 for detecting a signal corresponding to the rotation of the main shaft 6 is provided, and a detection signal of the rotary encoder 9 is input to detect a rotation angle of the main shaft 6 and a necessary motor is provided. A control unit 10 for outputting a control signal is provided, and the piston is inserted through an end face of the housing 2 that closes a front cylinder chamber 2c. Down 3 opposite to the rod member 7 is provided, the rod member pushing means 11 on the outer end of the rod member 7 is connected, said rod member pushing means 1
1 uses a motor 11g as a drive source and
When 1 g is not driven, it is assured that the rod member 7 is freely pushed outward by the piston 3. When the motor 11 g is driven, the rotation of the motor 11 g is converted to linear motion to drive the rod member 7. The control unit 10 is configured such that the rod member 7 is pushed into contact with the piston 3 so as to be able to push the rod member 7 until the piston 3 reaches the completely closed position. When it is detected that the rotation angle corresponding to the incompletely closed state close to ＝= (α + β) °, the motor start signal for starting the motor 11g is output, and the motor is started. The drive of the motor 11g is stopped when the main shaft 6 reaches the initial rotation angle = α ° corresponding to the fully closed state of the door in response to the door being completely closed after outputting the signal. A door closer characterized by outputting a motor drive stop signal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a door closer according to the present invention will be described below with reference to FIGS. First, FIG.
The configuration of the door closer will be described with reference to FIG. In this door closer, flange portions 2a and 2b of a housing 2 are fastened and fixed to a mounting plate 1 fixed to a top end portion of the door with screws with bolts (not shown), and a piston 3 slides in a cylinder chamber formed in the housing 2. The closed space between the guide bush 4a and the piston 3, which is freely inserted and screwed to the front end of the cylinder chamber, is a front cylinder chamber 2c and is an end plug screwed to the rear end of the cylinder chamber. The closed space between the piston 4b and the piston 3 is a rear cylinder chamber 2d,
A coil spring 5 for urging the piston 3 is housed in the front cylinder chamber 2c, and is externally connected via a link mechanism (not shown).
A main shaft 6 whose end is connected to the upper part of the door frame is inserted into a shaft hole (not shown) formed in the housing 2, and is further passed orthogonally to a long hole-shaped opening 3 a opened on both sides of the piston 3. A pinion 6 formed on the main shaft 6 is supported at both ends by the housing 2 via bearings (not shown) at both ends and sealed by an oil seal (not shown).
a is engaged with a rack 3b formed on the lower edge of the opening 3a on both sides of the piston 3, and the main shaft 6 is opened by the door opening operation.
Is rotated clockwise in the figure, the rotation of the pinion 6a and the rack 3b causes the piston 3 to move in the direction of compressing the coil spring 5 due to the rotation-linear motion conversion, and the coil spring 5 accumulates the restoring force. The rod member 7 is inserted through the guide bush 4a, is supported by a slide bearing (not numbered), and is sealed by an oil seal (not numbered).

Thus, the front cylinder chamber 2c and the opening 3a of the piston 3 communicate with each other through a communication hole 3d formed in the center of the front end wall of the piston 3, and
The opening 3a and the rear cylinder chamber 2d communicate with each other via a check valve 3e provided at the center of the rear end wall of the piston 3, so that the piston 3 moves in the left direction in FIG. The valve 3e is opened so that the hydraulic fluid in the front cylinder chamber 2c flows to the rear cylinder chamber 2d. Further, the front sliding surface 3f and the rear sliding surface 3f of the piston 3
annular space 3h between the outer peripheral surface of slightly smaller by the cylinder wall between the g is secured, said annular space 3h and piston
Fluid path 3n (first port threaded aperture 3a are communicated in emissions 3 and the annular space 3h and the rear cylinder chamber 2d is provided with a speed regulating valve 3m for adjusting the closing speed drilled in the cylinder wall 3n ′, the valve hole 3n ″ and the second port 3n ″ ″), the hydraulic fluid in the rear cylinder chamber 2d is moved forward when the piston 3 moves rightward in the drawing. It flows to the part cylinder chamber 2c.

Then, the end plug 4c is screwed into the guide bush 4a, and a retaining plate 7a formed in the middle of the rod member 7 is formed inside the guide bush 4a and the end plug 4b. The piston 3 is accommodated in a large-diameter stroke ensuring space 8 and the piston 3 is fully moved leftward in FIG.
Is fully moved to the left, the retaining plate 7
a serves to prevent the rod member 7 from coming off by stopping against the left end of the stepped end surface of the stroke security space 8.

The main shaft 6 is set such that an initial rotation angle (α °) corresponding to the fully closed state of the door is 15 °,
Thus, the coil spring 5 is slightly compressed to maintain the urging force when the door is fully closed. Then, a rotary encoder 9 for detecting a signal corresponding to the rotation of the main shaft 6 is provided, a detection signal of the rotary encoder 9 is input, a rotation angle of the main shaft 6 is detected, and a necessary motor control signal is output. And a rod member pushing means 11 connected to an end of a front rod portion 7b protruding from the end plug 4c of the rod member 7.

The rod member pushing means 11 is connected to a linear member 11b fitted and guided by a linear guide 11a at the front end of the rod member 7, and a gear is mounted on a rack 11b 'formed on the linear member 11b. A pinion 11d fixed to the outer end of the output shaft of the box 11c meshes with the bevel gear 11e fixed to the inner end of the output shaft of the gear box 11c, and a bevel gear 11f fixed to the inner end of the input shaft of the gear box 11c.
Is engaged with the input shaft of the gear box 11c and the output shaft of the motor 11g.
Bevel gears 11e, 11 when motor 11g is not driven
f, the rotation resistance of the pinion 11d is not large, and the rack 11b 'has a small thrust.
1 can be easily rotated clockwise in the figure when the pinion 11d is linearly moved to the left in FIG.
When 1 g is not driven, it is assured that the rod member 7 is freely pushed outward by the piston 3, and when the motor 11g is driven, the pinion 11d rotates counterclockwise in FIG. The linear motion member 11b is linearly moved rightward in FIG. 1 via a rack so that the rod member 7 can contact the piston 3 and be pushed. In order to ensure that the rod member 7 is freely pushed outward by the piston 3 when the motor 11g is not driven, a pinion 11d and a shaft on which the pinion 11d is mounted are connected. A one-way clutch bearing may be interposed between them. As shown in FIG. 3A, the rod member 7 does not block the communication hole 3d.
As shown in (b), the concave portion 7c is formed in the rod member 7, or the communication hole 3d is formed eccentrically.

The control unit 10 determines that the main shaft 6 has a rotation angle = (α +
β) When the rotary encoder 9 detects that the rotation angle has been reached, a motor start signal for starting the motor 11g is output, and the door is completely closed after outputting the motor start signal. When the rotary encoder 9 detects that the main shaft 6 has reached the initial setting rotation angle = α ° corresponding to the fully-closed state of the door in response to the state, the motor 11g stops driving the motor 11g. It is configured to output a stop signal.
α ° can be arbitrarily set to an angle larger than 15 ° and β ° can be arbitrarily set to an angle larger than 0 °. (0 ° is not included.) Β °
Can be configured so that it can be detected even in the range of 0 ° to 1 °, but if this range is included, it is possible to determine whether the door is completely closed or incompletely closed. Since a boundary cannot be formed, it is excluded because it causes a malfunction, and this range is theoretically included.

Next, the operation of the door closer of the above embodiment will be described with reference to FIGS. 2 (a), 2 (b), 2 (c) and 2 (d). FIG. 2A shows a state in which the door is fully closed. In this state, the main shaft is stopped at the rotation angle of the initially set rotation angle (α °) = 15 °, the piston 3 is moved to the right by the initial urging force of the coil spring 5, and
The rear cylinder chamber 2d has a minimum volume. The rack 11b 'has moved to the right with respect to the pinion 11d, and the left end of the rack 11b' has meshed with the pinion 11d. The rod member 7 is in contact with the piston 3, and the motor 11g is not driven. FIG. 2B shows a state in which the door is fully opened. In this state, the piston 3 is moved to the left, and the coil spring 5 is compressed by the piston 3 to accumulate the restoring force, and the rear cylinder chamber 2d has the maximum volume. The rod member 7 is pushed completely to the left by the piston 3, and the stopper plate 7a stops abutting on the left step end surface of the stroke guarantee space 8 to prevent the rod member 7 from falling off. The motor 11g is not driven. In the step of changing from FIG. 2A to FIG. 2B, that is, in the step of fully opening the door from the fully closed state, the main shaft 6 rotates clockwise to rotate the pinion 6a and the rack 3b-straight line. The piston 3 is turned into the coil spring 5 by the motion conversion.
The rod member 7 moves forward while compressing the front cylinder chamber 2.
c, the rear cylinder chamber 2d is expanded, and the hydraulic fluid in the front cylinder chamber 2c is
Flow to d. As described above, when the piston 3 pushes the rod member 7 to the left, the linear member 11b connected to the rod member 7 is guided by the linear guide 11a and moves to the left, and the rack 11b ' Rotation with pinion 11d-
Bevel gear 11 in gear box 11c by linear motion conversion
e and 11f rotate without driving. At this time, a signal is input to the control unit 10 from the rotary encoder 9. Even if a signal corresponding to the rotation angle of the main shaft 6 at (15 + β) ° is input at the start of opening the door, the signal is instantaneously input. Since this is an input and not a continuous input signal, the control unit 10
No activation start signal is output for 1g. FIG. 2C shows a state where the door is being closed. In this state, the piston 3 is in the middle of returning to the right due to the returning force of the coil spring 5,
Since the motor 11g is not driven, the rod member 7 remains stopped. FIG. 2D shows that the door closing operation stagnates in an incompletely closed state close to the fully closed state of the door, and in response to this, the main shaft 6 rotates within a rotation angle (α + β) ° of 16 ° to 25 °. It is in a stopped state. The cause of this state is
When the return force of the coil spring 5 is reduced, the return force of the coil spring 5 alone causes resistance or the like due to deformation (warpage, distortion) of the movable member constituting the door closer. When this state continues for a predetermined time, the control unit 10 determines whether or not the state of the signal input has passed a predetermined time in the range of 16 ° to 25 °. 11g, and the motor 11g is started. Then, the pinion 11d rotates counterclockwise and moves to the right of the rack 11b ', and the rod member 7 pushes the piston 3 to the right, so that the piston 3 moves to the state shown in FIG. It moves and the door is completely closed. Then, the rotary encoder 9 detects that the main shaft 6 has reached the initial setting angle of 15 °, and the control unit outputs a motor drive stop signal to the motor 11g, and the motor 11 stops driving. When resistance or the like does not occur even immediately before the door is fully closed, the door is fully closed only by the returning force of the coil spring 5. During this operation step, a signal is input from the rotary encoder 9 to the control unit 10, but since the signal input to the control unit 10 does not continue for a predetermined time, the control unit 10 does not output a motor start start signal to the motor 11g. Then, even if the door is fully closed and the signal input state of the control unit 10 becomes 15 °, the motor drive start signal is not output, and therefore, the motor drive stop signal is not output. 2B through the process of FIG. 2C from the process of FIG.
In the operation step (d) or the operation step changing to the step of FIG. 2A, that is, in the operation step in which the door is closed from the fully opened state, the piston 3 is moved rightward by the return force of the coil spring 5. The rack 3b and the pinion 6
The output shaft 6 rotates counterclockwise to close the door due to the linear-rotational motion conversion with a, and the closing torque of the main shaft 6 is transmitted to the door via a link mechanism (not shown), and the door is closed. At this time,
The working fluid in the rear cylinder chamber 2d, whose volume is reduced, flows to the front cylinder chamber 2c through a liquid passage 3n having a speed control valve 3m.

Next, modified examples included in the technical scope of the present invention will be described. The control unit 10 receives a detection signal of a rotary encoder 9 provided corresponding to the main shaft 6 and detects a rotation angle of the main shaft 6. In the above embodiment,
The control unit 10 sets the rotation angle of the main shaft 6 to 15 °, and the control unit 10 detects the rotation angle of the main shaft 6 as 15 °. However, when the door is fully closed, the initial rotation of the main shaft 6 is performed. It is not necessary to limit the angle to 15 °, and the angle can be set to a desired angle, for example, 13 °, depending on the mounting conditions. In that case, the control unit 10 sets the rotation angle of the main shaft 6 to 13 °. May be detected as 0 ° instead of detecting as 0 °. The linear member 11b and the rod member 7 may have an integral shape or a connection structure. Also, the rod member 7
The stopper preventing plate 7a may be formed integrally or a separate member may be fixed. Further, the stopper preventing plate 7a and the rod halves on both sides thereof may be combined and integrated. May be.

[0015]

As described above, according to the door closer of the present invention, when various resistances are generated just before the door is closed and the door is incompletely closed, the rotary angle of the main shaft 6 is adjusted by the rotary encoder 9. Upon detection, the control unit 10 outputs a motor start signal, the motor 12g starts, and the rod member 7 moves forward the piston 3, so that the door can be closed in a completely closed state, and the rod member 7 is smoothly moved by the piston 3. When the next door is opened, the piston moves forward without any trouble, and when various resistances do not occur immediately before the door is closed, the rod member 7 does not move and the piston returns due to the returning force of the coil spring 5. 3, the door can be closed until the door is completely closed. Also,
ADVANTAGE OF THE INVENTION According to the door closer of this invention, since it can be manufactured even if it adds a simple improvement to a conventional door closer, it is easy to manufacture, and since it can be manufactured compactly using a small motor, the mounting space can be reduced.

[Brief description of the drawings]

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

FIG. 2 is an operation process diagram of the door closer of FIG. 1; 2A is a cross-sectional view corresponding to a state where the door is fully closed, FIG. 2B is a cross-sectional view corresponding to a state where the door is fully opened, FIG. 3 is a cross-sectional view corresponding to an incompletely closed state close to a fully closed state of the door.

FIGS. 3A and 3B are cross-sectional views of a main part of the door closer of FIG. 1, in which FIGS.

FIG. 4 is a cross-sectional view of a conventional door closer.

[Explanation of symbols]

2 ... housing, 2c ... front cylinder chamber, 2d ... rear cylinder chamber, 3 ...
Piston, 3b Rack, 5 Coil spring, 6 Spindle , 6a Pinion, 7 Rod member, 9 Rotary encoder, 10 Control unit, 11
..Rod member pushing means, 11g ... motor,

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05F 15/12 E05F 3/10

Claims (1)

(57) [Claims] A piston is slidably inserted into a cylinder chamber formed in a housing, is connected to a door, and rotates the door.
A main shaft rotating in conjunction with the piston is inserted into the housing so as to be orthogonal to the piston, and a rack formed on the piston and a pinion provided on the main shaft are engaged with each other,
The rotation of the main shaft in the door opening direction causes the piston to move forward so as to reduce the front cylinder chamber, compressing the coil spring in the front cylinder chamber, and the return force of the coil spring causes the piston to reduce the rear cylinder chamber. In a door closer configured so that the main shaft rotates in the closing direction, a rotary encoder that detects a signal corresponding to the rotation of the main shaft is provided, and a detection signal of the rotary encoder is input. A control unit that detects a rotation angle of the main shaft and outputs a necessary motor control signal is provided, and a rod member penetrating from an end face portion closing a front cylinder chamber of the housing and facing the piston is provided. A rod member pushing means is connected to an outer end of the rod member, and the rod member pushing means comprises: When the motor is not driven, the rod member is freely pushed outward by the piston when the motor is not driven. When the motor is driven, the rotation of the motor is directly driven. The control unit is configured to push the rod member into contact with the piston and push the rod member until the piston reaches a completely closed position. When it is detected that the rotation angle corresponding to the near incomplete closing state has become a rotation angle of (α + β) °, a motor start signal for starting the motor is output, and the motor start signal is output. After the output, when the main shaft reaches an initial setting rotation angle = α ° corresponding to the fully closed state of the door in response to the door being completely closed, a motor drive for stopping the driving of the motor. Door closer characterized in that it outputs a stop signal.