JPH09206153A - Motor-driven reclining chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate danger and faults due to the catching of a part of a body or the like at the time of turning the backrest part and leg supporting part of a motor-driven reclining chair. SOLUTION: When one of switches 12, 13, 14 and 15 is operated and the elevation or lowering of the backrest part or the leg supporting part is instructed, corresponding to respective instructions, a control means 17 pulls out data from a memory part 18 and changes the setting of the discrimination value of a discrimination value setting circuit (sets it smaller in the case of lowering than the case of elevation.) Then, a relay circuit 21 is operated by driving a relay driving circuit 20, one of motors 6 and 8 is connected to a motor driving circuit 22 also as the setting of the rotating direction and the motor driving circuit 22 is operated. The detection output of a current detection circuit 25 for detecting the current of the motor driving circuit 22 and the discrimination value are compared by a comparator circuit 23 and the operation of the motor driving circuit 22 is stopped when the detection output exceeds the discrimination value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric reclining chair for rotating a rotating portion such as a backrest portion and leg supporting portions, and particularly to the rotation and the rotation when the rotating portion is rotated. A foreign matter or a rotation blocking object such as a person's hand is sandwiched between the base of the electric reclining chair that supports the rotating portion, and the motor for rotating the rotating portion fails due to a load, or it is painful. It is characterized by preventing problems such as

[0002]

2. Description of the Related Art Conventionally, a reclining chair has a leg support portion for supporting a leg of a seated person on the front side of a seat surface portion formed on the upper surface side of its base body, and a leg support portion for supporting the seated person on the rear side thereof. A backrest portion for receiving the back is provided, and the leg support portion, the backrest portion, and the like are configured as turning portions so that the inclination angle can be adjusted.

Further, this reclining chair is an electric type (hereinafter referred to as an electric type) which rotates a rotating portion by driving a motor as a drive source for rotating each rotating portion by operating a switch of an operating portion. , Electric recliner chairs), and these electric recliner chairs rotate the motor forward or reverse by any switch operation of the seated person, thereby moving the respective rotating parts in the ascending or descending direction, respectively. It is configured to rotate and adjust each rotating portion to a desired tilt angle.

[0004]

In this electric reclining chair, the driving force of the motor for rotating each rotating portion is set to be the same regardless of the rotating direction, and each rotating portion is moved upward. Since the weight of the seated person is received when the seat is turned, the driving force of the motor is set excessively in order to secure the turning force of the turning portion that can turn against the weight of the seated person.

Therefore, when the rotating direction of the rotating portion instructed by the operating portion is the descending direction, when a foreign substance or a rotating obstruction such as a human hand is sandwiched between the base body and the rotating portion. As a result, an excessive force is applied to the rotation obstructing object, which causes a problem such as a failure of the motor due to the load, damage to a foreign object, or a pain on a part of the human body.

[0006]

In order to solve this problem, an electric reclining chair according to the present invention has a seat portion formed on the upper surface side of a base body and a backrest portion to which one end is attached to the rear side of the seat surface portion. A leg support portion, one end of which is attached to the front side of the seat surface portion, is provided as a rotating portion that is rotatable in an ascending direction and a descending direction, and the rotating portion is driven according to a rotating direction instruction of an operating portion. In an electric reclining chair provided with a motor that can be rotated via a force transmission unit, a current detection circuit that detects a drive current of the motor,
A discriminant value setting circuit that sets an overload discriminant value of the drive current, a comparison circuit that compares the detected value of the current detection circuit and the discriminant value of the discriminant value setting circuit, and a rotation direction instruction from the operation unit are provided. When it is in the ascending direction, the setting of the overload determination value is changed so that the turning force of the rotating portion is smaller than that in the case of rotating in the descending direction, and based on the determination value of the comparison circuit. And a current control circuit for controlling the motor drive circuit.

According to the present invention, when the rotation direction instruction from the operation portion is the downward direction, the overload determination is made so that the turning force of the rotation portion is smaller than that in the case of the upward rotation. Since the setting of the value is changed, even if a foreign matter or a rotation obstruction such as a human hand is sandwiched between the base body and the rotation portion, an excessive force will not be applied, Motor failure due to load, foreign matter damage, or
Problems such as giving pain to a part of a person's body do not occur.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is such that a seat surface portion is formed on the upper surface side of a base body, and one end portion is attached to the rear side of the seat surface portion or the front of the seat surface portion. The leg support part, one end of which is attached to the part side, is provided as a rotating part that is rotatable in an ascending direction and a descending direction, and the rotating part is provided via a driving force transmitting part in accordance with a rotating direction instruction of the operating part. In an electric reclining chair provided with a motor for rotating the motor, a current detection circuit that detects a drive current of the motor, a determination value setting circuit that sets an overload determination value of the drive current, and a detection value of the current detection circuit. And a comparison circuit for comparing the discriminant value of the discriminant value setting circuit, and the rotation direction instruction from the operation unit is the ascending direction,
A current for changing the setting of the overload determination value so as to reduce the turning force of the rotating portion as compared with the case of rotating in the descending direction, and for controlling the motor drive circuit based on the determination value of the comparison circuit. An electric reclining chair including a control circuit, wherein the turning force of the turning portion is made smaller when the turning direction instruction from the first operation portion is the descending direction than when the turning operation is performed in the ascending direction. Since the setting of the overload determination value is changed as described above, even when a foreign matter or a rotation obstruction such as a human hand is sandwiched between the base body and the rotation portion, Since no excessive force is applied, problems such as motor failure due to load, damage to foreign matter, and pain in a part of the human body do not occur.

(Embodiment 1) An embodiment of the invention described in claim 1 of the present invention will be described below with reference to FIGS. 1 and 2. An embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 2, reference numeral 1 denotes an electric reclining chair, and the electric reclining chair 1 includes a base 2 to be placed on a floor surface, a seat surface portion 3 formed on the upper surface side of the base 1, and a rear portion of the seat surface portion 3. A backrest 4 for receiving the back of a seated person, one end of which is attached to the side, and a leg support portion 5 for supporting the leg of the seated person, the one end of which is attached to the front side of the seat surface portion 3. Has become.

Further, the backrest portion 4 and the leg support portion 5 are mounted as rotating portions, respectively, and the one backrest portion 4 has a back receiving surface 4a for receiving the back of a seated person. 3a and a first position (shown by a chain line) to be located in substantially the same direction, and the seat surface portion 3
The seat back surface is rotatable between a second position (shown by a solid line) in which the back receiving surface 4a is positioned in a direction substantially orthogonal to the seat surface. The direction of rotation is the first
The case of rotating in the second position direction from the position is referred to as the ascending direction, and the case of rotating from the second position in the first position direction is referred to as the descending direction.

The other leg support portion 5 has a third position (shown by a chain line) in which the upper surface 5a for receiving the legs of the seated person is located in substantially the same direction with respect to the seat surface of the seat surface portion.
And a fourth position (indicated by a solid line) in which the upper surface 5a is located in a direction substantially orthogonal to the seat surface 3a of the seat surface portion 3. The direction of rotation is called the descending direction when rotating from the third position to the fourth position direction, and the ascending direction when rotating from the second position to the first position direction. .

The backrest portion 4 is adapted to rotate when the driving force of the first motor 6 (shown in FIG. 1) is transmitted by the first driving force transmission portion (not shown). The leg support 5 includes a second motor 8 (shown in FIG. 1).
The driving force is transmitted by the second driving force transmitting portion 9 (shown by the alternate long and short dash line) so that it is rotated.

Reference numeral 10 is a controller for driving and controlling the first and second motors 6, 8, and this controller 10 is a first operating portion for instructing the turning direction of the power switch 11 and the backrest portion 4. , And a second operation portion for instructing the rotation direction of the leg support portion 5, respectively. The first operation section includes a switch 12 for raising the backrest 4 and a switch 13 for lowering the backrest 4, and the second operation section
The operating portion of the switch 1 for raising the leg support portion 5
4 and a switch 15 for lowering the backrest 4.

Next, the circuit configuration in the embodiment of the present invention will be described with reference to FIG. Reference numeral 16 denotes a CPU including a control circuit 17 and a memory unit 18, and each switch 12, 13, 14, 15 operated by a seated person on the control circuit.
When each rotation direction instruction signal is input from the control circuit 17, the control circuit 17 recognizes the rotation direction based on the input rotation instruction direction instruction signal and determines which switch the signal is input from. It is recognized whether the object to be rotated is the backrest portion 4 or the leg support portion 5.

When the condition is clarified by the recognition of the rotating direction and the object to be rotated, the control circuit 17 extracts the data corresponding to the condition from the data previously recorded in the memory unit 18, The data is input to the discriminant value setting circuit 19 to set the discriminant value of the discriminant value setting circuit 19. Further, the control circuit 17 outputs a relay drive signal created in accordance with the above-described clarified condition to drive the relay drive circuit 20, and operates the relay circuit 21 by driving the relay drive circuit. The relay circuit 21 includes a first motor 6 used when rotating the backrest 4.
The relay circuit 21 is provided between the second motor 8 used to rotate the leg supporting portion 5 and the motor driving circuit 22 for inputting a driving current to each of them.
The motor drive circuit 22 is electrically connected to one of the first and second motors 6 and 8 according to the relay drive signal from the control circuit 17, and the connected motor is The connection is made so that the direction of rotation thereof (determined depending on whether the rotating direction of the backrest portion 4 or the leg support portion 5 is the descending direction or the ascending direction) is either normal rotation or reverse rotation.

When the connection is completed, the motor drive circuit 22
Is activated by the control circuit 17, and the motor drive circuit 22 detects the motor drive current by the current detection circuit 25. The detection output is input to the comparison circuit 23 together with the discrimination value of the discrimination value setting circuit 19 and compared. When the detection output of the current detection circuit 25 is smaller than the discriminant value, the switches 12, 13, 14,
While the signal indicating the rotation direction is being input while any one of 15 is being operated, the motor drive circuit 22 outputs a drive current to one of the first and second motors 6 and 8 corresponding to the signal. It will be output.

Also, in the present embodiment, the switch 1
Backrest 4 by operating any one of 2, 13, 14 and 15
Alternatively, when the leg support portion 5 is rotated and then the operation of any of the switches 12, 13, 14, 15 that is operating the rotation is stopped and stopped at a predetermined angle, the predetermined angle The CPU 16 is provided with a holding circuit 24 for operating the motor drive circuit 22 so as to maintain the above.

Next, the discriminant value of the discriminant value setting circuit 19 will be explained. As for this discriminant value, the weight of the seated person on the backrest portion 4 and the leg support portion 5 and the weight of the placed luggage are abnormal. If it is applied significantly or is applied during rotation, the value of the current flowing through any of the first and second motors 6 and 8 increases abnormally, that is, the motor drive circuit 2
It is set in order to prevent a problem such as a failure of the first and second motors 6 and 8 and an electric circuit due to an abnormally large drive current output from the second motor 2.

As a result, when the comparison value indicates that the detection output of the current detection circuit 25 becomes larger than the discrimination value by the comparison by the comparison circuit 23, the control circuit 17 which inputs the comparison value causes the control circuit 17 to input the comparison value. The operation of the drive circuit 22 is stopped, and the driving of the first and second motors 6 and 8 is stopped. Further, the discriminant value set by the discriminant value setting circuit 19 is set to the discriminant value when the backrest portion 4 and the leg support portion 5 are rotated in the ascending direction as compared with the discriminant value when rotating in the descending direction. By increasing, the turning force in the ascending direction is made stronger than the turning force in the descending direction.
The reason for this is that when rotating in the ascending direction, it will rotate against the load of the seated person, etc., so it is necessary to make it larger than the turning force in the descending direction, and the backrest. When the part 4 and the leg support 5 are rotated in the descending direction, a part of the body of the person who is playing or a foreign object ( Since a rotation obstruction object such as a play tool is easily caught, when such a situation occurs, an excessive force is not applied to the rotation obstruction object.
Problems such as damage to foreign objects or pain on a part of the human body do not occur.

Further, in the first embodiment, since the weight of the seated person is applied to the backrest portion 4 rather than the leg support portion 5, the set value is set when the backrest portion 4 is rotated in both the descending direction and the ascending direction. Is set to be larger than when the leg support portion 5 is rotated. In the first embodiment, a first motor 6 for rotating the backrest portion 4 and a second motor 8 for rotating the leg supporting portion 5 are provided, and a relay drive is used for switching between them. The circuit 20 and the relay circuit 21 are provided, but the driving force of one motor is
Means for selectively switching between the driving force transmitting portion and the second driving force transmitting portion 9 may be provided to selectively rotate the backrest portion 4 and the leg support portion 5, and further, one motor By changing the transmission force ratio of the drive force of the motor using a transmission gear or the like, the first drive force transmission section and the second drive force transmission section 9 simultaneously transmit the drive force of the motor and the backrest section. 4 and the leg support 5 may be rotated at the same time.

[0021]

As described above, according to the electric reclining chair of the present invention, when the backrest portion or the leg support portion attached to the base body as the rotatable portion is rotated by the driving force of the motor, The discriminant value of the discriminant value setting circuit 19 for setting the magnitude of the turning force of the turning portion is larger than the turning force when turning in the descending direction of the turning force. Since the setting is changed so that even if a foreign matter or a rotation obstruction such as a human hand is caught between the base body and the rotating portion when the rotating portion is rotated in the descending direction, , No excessive force is applied,
Problems such as motor failure due to load, damage to foreign objects, and pain in a part of the human body will not occur.
Further, since the turning portion has a larger turning force for turning in the ascending direction than a turning force for turning in the descending direction, it is possible to turn against the load of a seated person or the like. It's easy.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an electric reclining chair according to an embodiment of the present invention.

FIG. 2 is a side view of the electric reclining chair according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric reclining chair 2 Base body 3 Seating surface portion 3a Seating surface 4 Backrest portion 4a Back receiving surface 5 Leg support portion 5a Upper surface 6 First motor 8 Second motor 9 Second driving force transmission unit 10 Controller 12 Switch 13 Switch 14 Switch 15 Switch 16 CPU 17 Control circuit 18 Memory section 19 Discrimination value setting circuit 20 Relay drive circuit 21 Relay circuit 22 Motor drive circuit 23 Comparison circuit 24 Holding circuit 25 Current detection circuit

Claims (1)

[Claims] 1. A seat back portion is formed on an upper surface side of a base body, and a backrest portion having one end portion attached to a rear portion side of the seat surface portion, or a leg support portion having one end portion attached to a front portion side of the seat surface portion is raised. And an electric reclining chair provided with a motor for rotating the rotating portion in a descending direction and rotating the rotating portion via a driving force transmitting portion in accordance with an instruction of the rotating direction of the operating portion. A current detection circuit that detects a drive current of a motor, a determination value setting circuit that sets an overload determination value of the drive current, and a comparison circuit that compares the detection value of the current detection circuit with the determination value of the determination value setting circuit. When the rotation direction instruction from the operation unit is the up direction, the overload determination value is set so that the turning force of the rotation unit is smaller than that in the case of rotating in the down direction. And change the ratio An electric reclining chair comprising a current control circuit for controlling the motor drive circuit based on the judgment value of the comparison circuit.