JP2013155495A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door closer that has simple constitution and is easy to manufacture and control.SOLUTION: A door closer includes an input shaft (3) which rotates as a door is opened and closed, an energizing member (4) which accumulates spring force for rotating the input shaft (3) in a door closing direction by rotation of the input shaft accompanying opening-directional rotation of the door, transmission gears (6) which speed up the rotation of the input shaft (3), and a generator (5) including a stator (52) and a rotor (53) provided opposite the stator (52) and coupled through the transmission gears (6), and is characterized in using induced electromotive force of the generator (5) generated corresponding to a rotating speed of the input shaft (3) accompanying opening and closing of the door to damp the door.

Description

  The present invention relates to a door closer that adjusts the closing speed when an opened door is automatically closed.

  A door closer is used to automatically close the opened door. A general door closer has a structure including an urging member that stores a spring force in the door closing direction by rotation of the door in the opening direction, and an oil damper that reduces rotation of the urging member in the door closing direction. . The oil damper relaxes the speed of the piston by moving the oil through the orifice provided in the cylinder when the piston returns by the spring force of the urging member. The speed of the closing direction rotation is regulated. However, in a door closer using an oil damper, the viscosity of the oil changes depending on the air temperature, so that the speed in the door closing direction varies depending on the season and usage environment. Patent Document 1 discloses a door closer that solves this problem and adjusts the closing of the door at a constant speed.

  The door closer described in Patent Document 1 regulates the door closing to a constant speed with electric power. This door closer has an input shaft that rotates by the rotation of the door, a spring that stores a spring force that rotates and biases the door in the closing direction by the rotation of the input shaft by the rotation of the door, and an induced electromotive force by the rotation of the door that opens and closes And a rotation control means driven by the power generation speed control means. The power generation regulating means has a rotor having a magnet and a stator wound with a coil. The rotor is connected to the input shaft, and generates an induced electromotive force when the door rotates in the closing direction.

  The rotation control means includes a charging capacitor, a brake circuit, and a rotation control circuit. The charging capacitor is charged by the power generation by the power generation control means, and the rotation control circuit is activated by charging the charging capacitor. The brake circuit is connected to a coil of the stator in the power generation speed control means, and brakes (dumps) the rotational speed of the rotor by energizing the stator. The operation of this brake circuit is controlled by a rotation control circuit.

  The brake circuit brakes the rotational speed of the door, which is the input shaft, by braking the rotational speed of the rotor. Since the spring force (restoring force) of the spring is large at the start of door closing, the brake circuit decelerates the rotational force of the rotor and brakes the door so that the door rotates at a constant speed in the closing direction. On the other hand, when approaching the end of the door closing, the spring force of the spring decreases and the rotational force of the rotor decreases, and the brake circuit weakens the braking force to the rotor and increases the rotational speed of the rotor. As a result, the door rotates at a constant speed in the closing direction. According to such a door closer of Patent Document 1, since an oil damper is not used, the door can be closed at a constant speed without being affected by temperature.

JP 2000-130005 A

  However, since the door closer of Patent Document 1 has a structure in which electric power generated in conjunction with the rotation of the door is charged into a charging capacitor and used for speed control of the door, many circuits such as a charging capacitor, a brake circuit, and a rotation control circuit Need. For this reason, since the structure is complicated and the production is troublesome, it cannot be made compact, and the control is complicated and the cost is high.

  The present invention has been made in consideration of such conventional problems, and can regulate the rotational speed of the door without accumulating the generated power and using it for door speed control, Accordingly, an object of the present invention is to provide a door closer that can be provided at a low cost with a simple configuration that is easy to manufacture and control.

  The door closer according to the present invention includes an input shaft that rotates as the door is opened and closed, and an urging force that stores a spring force for rotating the input shaft in the door closing direction by the rotation of the input shaft that is rotated in the opening direction of the door. A member, a transmission gear for accelerating the rotation of the input shaft, a stator, and a generator having a rotor provided opposite to the stator and connected via the transmission gear. The induced electromotive force of the generator generated according to the rotational speed of the accompanying input shaft is used for door damping.

  The biasing member is preferably a spiral spring.

  The generator has a plurality of resistors as a load, and the resistance value is small when the door is opened larger than a predetermined angle, and the resistance value is large when the door is closed and smaller than the predetermined angle. It is preferable that a load circuit including a changeover switch to be changed is provided.

  The load circuit is preferably provided with a diode for rectifying so that an induced electromotive force is not generated when the door is rotated in the opening direction but an induced electromotive force is generated when the door is rotated in the closing direction.

  The resistor is preferably a variable resistor.

  The changeover switch is preferably a mechanical switch that is operated by rotation of the input shaft.

  According to the door closer of the present invention, when the rotor connected to the input shaft rotates, the generator generates an induced electromotive force, and when a current flows through the load circuit, a reverse rotational force is applied to the input shaft via the rotor. Works. As a result, the rotational speed when the door is opened and closed can be regulated. As described above, in the present invention, the rotational speed of the door can be damped without storing the induced electromotive force for controlling the speed of the door. For this reason, it becomes a simple structure, manufacture and control are easy, and it can be made cheap.

  Since the urging member is a spiral spring, the dimension in the length direction is shorter than that of the coil spring, so that the size can be reduced.

  A load switch of the generator is provided with a changeover switch and a plurality of resistors. When the door is opened larger than a predetermined angle by the changeover switch, the resistance value is decreased, and when the door is closed and smaller than the predetermined angle, the resistance is decreased. Since the value is changed so as to be increased, when the door is closed and the force of the urging member becomes weak, it is possible to prevent the door from being greatly damped.

  Since the diode is provided in the load circuit of the generator, an induced electromotive force is not generated when the door is rotated in the opening direction, and an induced electromotive force is generated when the door is rotated in the closing direction. When the door is opened, energy for closing the door is stored in the biasing member, so that the door is not dumped more than necessary.

  Since the resistor is a variable resistor, the value of the resistor can be initialized according to the door.

  Since the changeover switch is a mechanical switch, it can operate stably without requiring a complicated circuit as compared with an electric changeover switch operated by voltage.

It is a front view of the state where the door closer by the present invention was attached to the door. It is a top view of the door closer of the present invention. It is a front view of the door closer of the present invention. It is a top view at the time of removing a cover in FIG. It is explanatory drawing which shows the internal structure of a door closer. It is a circuit diagram of a generator. It is explanatory drawing which shows an example of the operation | movement of the closing direction rotation of a door.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 to 7 show a door closer according to an embodiment of the present invention. FIG. 1 is a front view showing a state in which the door closer is disposed on the door, FIG. 2 is a plan view of the door closer, FIG. FIG. 5 is a plan view of the upper part, FIG. 5 is an internal structure diagram, FIG. 6 is a circuit diagram of a load circuit, and FIG. 7 is an explanatory diagram of an example of operation.

  As shown in FIG. 1, the door closer 1 is attached to the upper part of the indoor surface side of the door 100 attached to the wall 110 of a building so that opening and closing is possible. The door closer 1 and the wall 110 are connected by an arm member 120. The arm member 120 is formed by a first arm 121 on the wall body 110 side and a second arm 122 on the door closer 1 side connected to the first arm 121 via a hinge shaft 123. The end of the first arm 121 on the wall 110 side is hinged to a bracket 130 attached to the wall 110, and the end of the second arm 122 on the door closer 1 side is connected to the input shaft 3 of the door closer 1. . In such a structure, by rotating the door 100 in the opening and closing direction, this rotation is transmitted to the input shaft 3 of the door closer 1 via the arm member 120, and the input shaft 3 rotates in the forward and reverse directions.

  2 to 4 show the door closer 1 of this embodiment. The door closer 1 includes a case 2 serving as an outer shell, and an input shaft 3, a biasing member 4, a generator 5, and a transmission gear 6 are disposed in the case 2.

  The input shaft 3 is provided on the upper end side of the door closer 1 (see FIG. 3), and the input end 31 is connected to the second arm 122 of the arm member 120 (see FIG. 1). The input end 31 of the input shaft 3 is a non-circular shape such as a quadrangle (see FIG. 2), and the input shaft 3 is rotated in the forward / reverse direction by transmitting the rotational force accompanying the opening / closing of the door 100 from the second arm 122. Rotate to. The input shaft 3 extends in the axial direction (vertical direction) in the case 2, and an urging member 4 is attached to an intermediate portion in the length direction (see FIG. 3). Are connected (see FIG. 5).

  In this embodiment, a spiral spring is used as the biasing member 4 (see FIG. 4). The spiral spring has one end 41 locked to the input shaft 3 and the other end 42 locked to the case 2. The biasing member 4 is wound by the rotation of the input shaft 3 due to the rotation of the door 100 in the opening direction, whereby the biasing member 4 has a spring force that rotates the input shaft 3 in the reverse direction (door closing direction). Stored as energy. By using a spiral spring as the urging member 4 in this way, the axial length can be shortened compared to the case of using a coil spring. For this reason, it is possible to reduce the size of the door closer 1 by shortening the entire length thereof, and there is an advantage that handling and appearance are improved. As the urging member 4, a coil spring can be used.

  As shown in FIG. 5, the transmission gear 6 is provided at the end portion of the input shaft 3 in the length direction. The transmission gear 6 is formed by a gear train in which a plurality of gears are engaged, and the rotation of the input shaft 3 is increased and transmitted to a generator 5 described later. The transmission gear 6 includes a large-diameter first gear 61 connected to a terminal portion of the input shaft 3, a small-diameter second gear 62 meshed with the first gear 61, a coaxial large-diameter third gear 63, and a third gear. A small-diameter fourth gear 64 meshed with the gear 63, a coaxial large-diameter fifth gear 65, and a small-diameter sixth gear 66 meshed with the fifth gear 65. A sixth gear 66 is connected to the rotor shaft 51 of the rotor 53. When the rotational speed of the input shaft 3 is set to 1, for example, the acceleration rate can be 1: 125. The rotation of the input shaft 3 is transmitted to the rotor shaft 51 at such a large acceleration rate. As a result, the rotor shaft 51 rotates at a high speed when the door 100 is opened and closed between the 0 ° state where the door 100 is closed and the 90 ° state where the door 100 is open. The transmission gear 6 is not limited to the illustrated gear train, and can be appropriately selected according to the speed increasing ratio.

  As shown in FIG. 5, the generator 5 includes a stator 52 having magnets formed in two or more poles and a rotor 53 provided corresponding to the stator 52. The rotor 53 includes a rotor shaft 51 connected to the input shaft 3 via the transmission gear 6 and a coil 54 attached to the rotor shaft 51, and the coil 54 is opposed to the stator 52 with a predetermined gap. Yes. Therefore, when the rotation of the input shaft 3 accompanying the opening / closing of the door 100 is transmitted to the rotor shaft 51 via the transmission gear 6, the generator 5 generates an induced electromotive force by rotating the rotor 53, and the load circuit has a current. Flows to the input shaft 3 via the rotor 53 in the reverse direction. Therefore, the rotation of the input shaft 3 when the door 100 rotates in the closing direction can be adjusted by the spring force of the biasing member 4 in the return direction. There is a commutator (not shown) between the rotor 53 and the load circuit 7. Without being limited to such an embodiment, the stator 52 may be formed of a coil and the rotor 53 may be formed of a magnet.

  As shown in FIG. 6, a load circuit 7 is connected to the generator 5. The load circuit 7 includes two first resistors 71 and a second resistor 72 connected in series, and a changeover switch 73 that switches the resistors 71 and 72. Variable resistors are used as the resistors 71 and 72. It is sufficient that at least one resistor is provided in the load circuit 7. In addition, the 1st resistor 71, the 2nd resistor 72, and the changeover switch 73 are attached to the position shown in FIG. Projecting upward are the pins of the first resistor 71 and the second resistor 72.

  In the load circuit 7, when the changeover switch 73 is closed (turned on), the second resistor 72 is short-circuited and the first resistor 71 is connected to the generator 5, and when the changeover switch 73 is opened (turned off). The first resistor 71 and the second resistor 72 are connected to the generator 5 in series. In a state where only the first resistor 71 is connected to the generator 5, the resistance value of the load circuit 7 is small, so that a large current flows and the induced electromotive force of the generator 5 becomes large. As a result, the damping force acting on the input shaft 3 is large, and the door 100 rotates at a slow speed due to the spring force of the urging member 4 being deflected. On the other hand, in the state where the first resistor 71 and the second resistor 72 are connected in series, the resistance value of the load circuit 7 is large, so that the current is small and the induced electromotive force of the generator 5 is small. Accordingly, the damping force acting on the input shaft 3 is reduced. At this time, since the spring force of the urging member 4 is weak, the door 100 can rotate without being damped more than necessary.

  In FIG. 6, reference numeral 74 denotes a diode inserted between the generator 5 and the resistors 71 and 72. The diode 74 operates to pass a current through the load circuit 7 only when the door 100 rotates in the closing direction, and to cut off the current when the door 100 rotates in the opening direction. Therefore, when the door 100 rotates in the opening direction by the opening operation, the generator 5 does not generate an induced electromotive force, and the reverse rotational force from the generator 5 does not act on the input shaft 3. The opening operation of the door 100 can be performed smoothly. On the other hand, when the door 100 rotates in the closing direction by the spring force of the urging member 4, the generator 5 generates an induced electromotive force, and a current flows through the load circuit, whereby a damping force acts on the input shaft 3. For this reason, damping against the spring force of the biasing member 4 is performed, and the rotational speed of the door 100 due to the spring force of the biasing member 4 can be reduced. The speed control in the closing operation of the door 100 is adjusted according to the opening / closing angle of the door 100. A cam member 8 is provided in order to perform adjustment in accordance with the opening / closing angle.

  As shown in FIGS. 2 and 3, the cam member 8 is attached to the input shaft 3 to rotate integrally with the input shaft 3. As shown in FIG. 6, the changeover switch 73 is switched on and off in accordance with the rotation angle of the input shaft 3 (opening / closing angle of the door 100). In order to perform this switching, the cam member 8 is formed in a fan shape in which a part of an arc is cut out. When the cut-out portion faces the change-over switch 73, the change-over switch 73 is turned off, and the cut-out portion is removed. When the other part faces the changeover switch 73, the changeover switch 73 is turned on. In this embodiment, the changeover switch 73 is turned on by the cam member 8 when the door 100 angle is 90 ° to 20 °, and the changeover switch 73 is turned off when the door angle is 20 ° to 0 °. The shape of the cam member 8 is set so that it may be made. Instead of using a cam, a magnet may be attached to a disc attached to the input shaft 3, and the contact of the changeover switch 73 may be attracted or separated by this magnetic force. Since the above-described cam or magnet is a mechanical switch that is operated by the rotation of the input shaft, for example, it may not be an electronic component that requires a 5V power source, and switching can be performed stably.

  Next, the operation of this embodiment will be described. As shown in FIG. 1, when the door 100 is rotated in the opening direction with the door closer 1 attached to the door 100, the input shaft 3 rotates in the same direction, and the rotor 53 of the generator 5 rotates at high speed via the transmission gear 6. Rotate. When the door 100 rotates in the opening direction, the current of the load circuit 7 is interrupted by the diode 74, so that the damping of the generator 5 does not act on the door 100. For this reason, the door 100 can be opened smoothly. When the door 100 is rotated in the opening direction, the urging member 4 is tightened, so that a spring force that rotates the door 100 in the closing direction is stored in the urging member 4.

  After the door 100 is opened, it is rotated in the closing direction by the spring force of the biasing member 4. As the door 100 rotates in the closing direction, the input shaft 3 rotates in the same direction, and the rotor of the generator 5 rotates at high speed via the transmission gear 6. When the door 100 rotates in the closing direction, the load circuit 7 is energized by the diode 74, and an induced electromotive force is generated. As a result, the rotational force in the reverse direction of the input shaft 3 acts, so that the rotational speed in the closing direction of the door 100 is damped.

  In the rotation of the door 100 in the closing direction, the cam member 8 rotates with the rotation of the input shaft 3, and the changeover switch 73 is turned on and off in accordance with the opening / closing angle of the door 100. In this embodiment, the changeover switch 73 is turned on when the opening angle of the door 100 is 90 ° to 20 °. In the ON state of the changeover switch 73, only the first resistor 71 is connected to the generator 5, and the resistance value of the load circuit 7 is small, so that the induced electromotive force is large. The door 100 rotates at a slow speed due to the spring force of the biasing member 4 being deflected. On the other hand, when the opening angle of the door 100 is smaller than 20 °, the changeover switch 73 is turned off. For this reason, the 1st resistor 71 and the 2nd resistor 72 will be in the state connected in series, the resistance value of a load circuit will become large, and an induced electromotive force will become small. That is, in this state, since the spring force of the urging member 4 is small, large damping can be prevented.

  In such an embodiment, since the speed of the door is not controlled using oil, the speed of the door can be reliably controlled without being affected by the season or the environmental temperature. Further, the generator 5 does not need a capacitor for storing the induced electromotive force, and the door 100 can be regulated. In addition, the load circuit can be simplified. Operation is stable.

  Further, since the cam member 8 is provided on the input shaft 3 and the change-over switch 73 of the load circuit 7 is turned on and off, damping according to the rotation angle of the input shaft 3, that is, the door opening / closing angle can be performed reliably.

  In addition, by providing the load circuit 7 with the diode 74, the generator 5 generates an induced electromotive force when the door 100 rotates in the closing direction, and does not generate an induced electromotive force when the door 100 rotates in the open direction. No mechanical clutch is required. Thereby, it becomes a simpler structure and can be reduced in size.

  In this embodiment, since the variable resistors are used as the first resistor 71 and the second resistor 72, when the door closer 1 is attached to the door 100, the initial speed for arbitrarily adjusting the speed of closing the door 100 is adjusted. Setting can be performed easily. In addition, even after attachment to the door 100, the speed of the closing rotation of the door 100 can be adjusted by adjusting the resistance value, which is convenient for use.

  The present invention is not limited to the above embodiments, and various modifications can be made. In the above embodiment, the two resistors of the first resistor 71 and the second resistor 72 are provided in the load circuit 7, but the number of resistors may be at least one, and three or more. May be. Further, fixed resistors may be used as the resistors 71 and 72. In the above embodiment, the diode 74 is provided, but the diode 74 may be omitted. In this case, damping by the generator 5 can be performed by rotating the door 100 in both the closing direction and the opening direction. Further, a capacitor for storing the induced electromotive force of the generator 5 may be provided in the load circuit 7, and the door 100 may be illuminated by connecting an LED or the like to this capacitor.

  INDUSTRIAL APPLICABILITY The present invention is suitable as a door closer that can perform door damping by induced electromotive force with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Door closer 2 Case 3 Input shaft 4 Energizing member 5 Generator 6 Transmission gear 7 Load circuit 8 Cam member 51 Rotor shaft 52 Stator 53 Rotor 54 Coil 71 1st resistor 72 2nd resistor 73 Changeover switch 74 Diode 100 Door 110 Wall Body 120 Arm member 130 Bracket

Claims (6)

An input shaft that rotates as the door opens and closes;
An urging member that stores a spring force for rotating the input shaft in the door closing direction by rotation of the input shaft accompanying rotation of the door in the opening direction;
A transmission gear for increasing the rotation of the input shaft;
A stator and a generator having a rotor provided opposite to the stator and connected via the transmission gear;
A door closer characterized in that an induced electromotive force of the generator generated according to a rotation speed of an input shaft accompanying opening and closing of a door is used for door damping.
The door closer according to claim 1, wherein the biasing member is a spiral spring.
The generator includes
A plurality of resistors as loads, and a changeover switch for changing the resistance value to be small when the door is opened larger than a predetermined angle, and to increase when the door is closed and smaller than the predetermined angle; The door closer according to claim 1, further comprising a load circuit comprising:
4. The load circuit is provided with a diode that rectifies so as not to generate an induced electromotive force when the door rotates in the opening direction but to generate an induced electromotive force when the door rotates in the closing direction. Door closer.
The door closer according to claim 3, wherein the resistor is a variable resistor.
  The door closer according to claim 3, wherein the changeover switch is a mechanical switch that operates by rotation of the input shaft.

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