JP2013078451A - Electric bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen a degree of designing freedom because prior electric beds have a low degree of designing freedom, including a crank handle mounting position.SOLUTION: The electric bed is so constituted that the rotating side of the rotation-linear motion conversion mechanism in the actuator is configured with a DC motor and decelerating mechanism. as to utilize an actuator 9 including rotation-linear motion conversion mechanism to up/down or undulate a floor part to selectively supply power to the DC motor by a controller 18 connected to commercial power supply or by a manual generator 1 driven by the crank handle 7. The manual generator has a reversibly operating DC motor and accelerating mechanism housed in a container 5 and, outside the container, the crank handle connected to an input shaft of the accelerating mechanism and a feeding cable 8. The accelerating mechanism is configured with worm gear mechanism with a worm wheel on the crank handle side and a multiple-threaded screw worm on the DC motor side, reducing greatly size and weight.

Description

  The present invention relates to an electric bed, and more particularly to an electric bed capable of moving up and down and raising and lowering a floor in an emergency such as a power failure.

  Various types of electric beds have been proposed and used in the prior art, in which the floor is lifted and lowered by an actuator having a DC motor, a speed reduction mechanism, and a rotation-linear motion conversion mechanism. In such an electric bed, a controller for operating the DC motor of the actuator using a commercial power source is provided, and a predetermined DC voltage is obtained from the commercial power source by this controller and applied to the DC motor. . For example, 24V is widely used as the DC voltage.

  Moreover, in such an electric bed, many measures are taken so that the floor can be lifted and lowered even when the commercial power source is out of power.

  For example, in Patent Document 1, a connection hole for detachably connecting an end portion of a crank handle is formed at the rear portion of an actuator so that the output shaft of the electric motor can be rotated by a manual handle.

  Further, in Patent Document 2, a gear transmission mechanism is provided on a main drive shaft extending from an output shaft of an electric motor to a screw shaft constituting a rotation-linear motion conversion mechanism, and a crank handle can be connected in a lateral direction of the main drive shaft. A drive shaft is configured.

  As described above, in Patent Document 1 and Patent Document 2, since the crank handle is attached to the actuator, there is a restriction on the position where the crank handle is installed. Therefore, there is also a restriction on the installation position of the actuator. In some cases, it must be installed in a place where it is difficult to operate.

  Moreover, in patent document 3, the battery for supplying electric power at the time of a power failure is provided. Other documents have proposed a solar cell as a battery.

  In the case of using a battery at the time of a power failure, the cost becomes high, and in the case of a rechargeable type, if it is forgotten to charge, it may not be used in an emergency, and it is troublesome to monitor the amount of charge, etc. , Hard to get the necessary power.

Japanese Patent No. 2670759 Japanese Utility Model Publication No. 58-196648 Japanese Patent No. 2832908

  The problem to be solved by the present invention is that the conventional electric bed has a low degree of design freedom including the installation position of the crank handle for manual operation at the time of a power failure or the like. The purpose is to expand the degree.

  In order to solve the above-described problem, in the present invention, in a bed in which the raising / lowering and undulating operation of the floor is performed using an actuator having a rotation-linear motion conversion mechanism, the rotation side of the rotation-linear motion conversion mechanism of the actuator is We propose an electric bed that consists of a DC motor and a speed reduction mechanism, and that selectively supplies power to the DC motor using a controller connected to a commercial power source and a manual generator driven by a crank handle.

  Further, according to the present invention, in the above configuration, a plurality of actuators are installed corresponding to the raising and lowering and undulation portions, and the power supply to the DC motor of each of the plurality of actuators is performed by a controller connected to a commercial power source. An electric bed configured to be selectively performed from a common manual power generator via a changeover switch is proposed.

  According to the present invention, in the above-described configuration, the manual power generator stores the DC motor capable of reversible operation and the speed increasing mechanism connected to the rotating shaft of the manual power generator. A crank handle connected to the input shaft of the speed mechanism and a power supply cable connected to the power source side of the DC motor are provided, and a connector that can be connected to the power source side connector of the DC motor is provided at the front end side of the power supply cable. We propose an electric bed with a built-in configuration.

  In the present invention, in the above configuration, the speed increasing mechanism proposes an electric bed in which the crank handle side is configured as a worm wheel and the DC motor side is configured as a worm, and the worm is configured as a plurality of screws. Propose an electric bed.

  The present invention also proposes an electric bed in which the DC motor and the speed increasing mechanism of the manual power generator are the same as those of the actuator DC motor and the speed reducing mechanism in the above configuration.

  According to the present invention, in the above-described configuration, the manual power generator proposes an electric bed configured such that the crank handle is installed at an appropriate position of the operable bed or is detachably supported at an appropriate position of the bed.

  In an ordinary state, the electric bed according to the present invention feeds DC power from the commercial power source to the DC motor of the actuator to cause the floor portion to move up and down and undulate. Therefore, the floor controller can be moved up and down and undulated using a remote controller in the same way as a normal electric bed.

  On the other hand, when the commercial power supply fails, for example, when a person lying on the floor of the bed is prevented from using the remote controller to raise or lower the floor, When power supply to the DC motor of the actuator cannot be performed or when it is not performed, the crank handle of the manual power generator is driven to rotate to generate DC power, and the DC motor constituting the actuator is driven to rotate by this DC power. Then, the floor is moved up and down or undulated through the rotation-linear motion conversion mechanism.

  In such ascending / descending and raising / lowering operations, it is only necessary to obtain a predetermined displacement, and a constant controlled operation such as a constant speed operation is not necessarily required. Can be moved up and down and up and down without causing the person lying on the floor to feel uncomfortable.

  Since the actuator and the manual power generation device provided with the crank handle may be connected by a power supply cable, both the actuator and the manual power generation device have a high degree of freedom in their installation. In particular, the manual power generator can be installed in a suitable place on the bed, or can be removably supported in a suitable place and can be held by hand during use, making it very easy for the operator to operate the crank handle. it can.

  In the electric bed according to the present invention, the manual power generator may be provided in each case when there are a plurality of places where the floor portion is lifted or lowered, and the connection of the power supply cable to the manual power generator is selected by the connector. By making it possible, it is possible to cope with the operations at a plurality of locations with a common manual power generator. Further, the connection between the common manual power generator and the DC motors of a plurality of actuators can be easily performed using a changeover switch.

  In the present invention, the speed increasing mechanism constituting the manual power generator can be greatly reduced in size and weight by being constituted by a worm gear mechanism in which the crank handle side is a worm wheel and the DC motor side is a worm.

  At this time, the worm can be configured as two or more threads, that is, a plurality of threads, and the effect of friction can be reduced by increasing the torsion angle. Generally, the number of revolutions required as a power generator is at least 1500 rpm (25 Hz), for example, and the input revolutions possible with a manual device is considered to be close to the limit value of 120 rpm (2 Hz). The speed increase ratio should be 12.5 or more. In the present invention, a manual power generator that satisfies the above-described requirements in size and structure that can be easily operated by increasing the speed ratio and transmission efficiency by using two or more threads as the worm. Can be realized.

  In the present invention, the DC motor and speed increasing mechanism of the manual power generator can be configured in the same manner as the DC motor and speed reducing mechanism of the actuator, which can greatly reduce the cost.

  Furthermore, in the present invention, in the state where the floor portion is raised and lowered in the manual power generator, if an abnormal load is applied to the actuator due to a human part being sandwiched between the floor portions, the load increases. Appears as an increase in the required torque of the crank handle of the manual power generator, so that an abnormality can be detected, and since the crank handle and the actuator are not directly mechanically coupled, the safety is high.

FIG. 1 is an explanatory view conceptually showing the configuration and operation of an example of a manual power generator used in an electric bed according to the present invention. FIG. 2 is an external view of the main body of an example of the manual power generator used in the electric bed according to the present invention. FIG. 3 is a longitudinal sectional view of an example of a manual power generator used in the electric bed according to the present invention. FIG. 4 is a front view showing a configuration of a DC motor and a speed increasing mechanism which are components of an example of a manual power generator used in the electric bed according to the present invention. FIG. 5 is a plan view showing a configuration of a DC motor and a speed increasing mechanism, which are components of an example of a manual power generator used in the electric bed according to the present invention. FIG. 6 is a left side view showing a configuration of a DC motor and a speed increasing mechanism which are components of an example of a manual power generator used in the electric bed according to the present invention. FIG. 7 is an explanatory view conceptually showing an embodiment of the electric bed of the present invention. FIG. 8 is an explanatory view conceptually showing another embodiment of the electric bed of the present invention. FIG. 9 is an explanatory diagram conceptually showing a state in which the manual power generator is installed on the bed in the embodiment of the electric bed of the present invention. FIG. 10 is an explanatory view conceptually showing another state in which the manual power generator is installed on the bed in the embodiment of the electric bed of the present invention. FIG. 11 is an explanatory view conceptually showing another embodiment of the electric bed of the present invention. FIG. 12 is an explanatory view conceptually showing still another embodiment of the electric bed of the present invention.

  Next, an embodiment of an electric bed according to the present invention will be described with reference to the accompanying drawings. First, an electric bed according to the present invention and a manual power generator used therein will be described. In the figure, reference numeral 1 generally indicates a manual power generator, and the manual power generator 1 is a reversible DC motor 2. The speed increasing mechanism 4 connected to the rotating shaft 3 is stored in the container 5. A crank handle 7 connected to the input shaft 6 of the speed increasing mechanism 4 and a power supply cable 8 connected to the power source side of the DC motor 2 are provided outside the body 5. A power supply connector 12 that can be connected to a power supply side connector 11 of a DC motor 10 that constitutes an actuator 9 for performing raising and lowering and raising / lowering operations of the floor in the electric bed of the present invention is provided on the distal end side of the power supply cable 8. ing. Reference numeral 13 denotes a power receiving cable, and 14 denotes a speed reduction mechanism that is a component of the actuator 9. Reference numeral 18 denotes a controller connected to a commercial power source, and a power supply cable 19 from the controller 18 is connected to the DC motor 10 constituting the actuator 9. In this embodiment, the body 5 of the manual power generator 1 has a configuration in which a pair of shell bodies divided in the longitudinal direction are coupled with screws (not shown) to support each element in a retracted state.

  Here, the speed increasing mechanism 4 will be described in detail. As shown in FIGS. 3 to 6, the speed increasing mechanism 4 uses the crank handle 7 side as a worm wheel 15 and projects the input shaft 6 against the worm wheel 15. The dc motor 2 side is configured as a worm 16 that meshes with the worm wheel 15. Since the worm 16 is configured as a double thread and its torsion angle is larger than the friction angle, the worm gear mechanism can be reversibly operated. In such a worm gear mechanism, for example, a large speed increase ratio (reduction ratio) of 1/32 can be easily obtained. Incidentally, a member denoted by reference numeral 17 indicated by a two-dot chain line in the figure indicates a support member for the input shaft 6, the worm wheel 15 and the worm 16.

  Next, FIG. 7 is an explanatory view conceptually showing an embodiment of the electric bed of the present invention. In this figure, a floor portion that is rotatably supported by the floor portion support frame 20 and corresponds to the back of the user. 21 shows a configuration in which 21 is rotated by a linear motion member 23 of an actuator 9 connected to a push-up arm 22 provided on the lower side of the rotation fulcrum side.

  In the electric bed according to the present invention described above, in normal times, the DC electric motor 10 of the actuator 9 is supplied with DC power from the commercial power source through the controller 18 through the power supply cable 19 to perform the raising and lowering and undulating operation of the floor. Make it. Therefore, the floor controller 2 can be lifted and lowered by using a remote controller in the same manner as a normal electric bed.

  On the other hand, when the commercial power supply is interrupted, for example, when a person lying on the floor of the bed is prevented from using the remote controller to move the floor up and down and undulate, the controller 18 is used. When the power supply to the DC motor 10 of the actuator 9 cannot be performed or is not performed, the manual power generator 1 connects the power supply connector 12 of the power supply cable 8 to the actuator 9 as shown in FIGS. After connecting to the power source side connector 11 of the DC motor 10 to be configured, the device 5 is held and the crank handle 7 is driven to rotate.

  The rotation of the crank handle 7 is accelerated by the speed increasing mechanism 4 and the electromotive force is generated by rotating the rotor of the DC generator 2. The generated DC power is received from the power supply cable 8 and the connectors 12 and 11. 13 is supplied to the DC motor 10 constituting the actuator 9 through 13 to operate the actuator 9.

  Thus, by moving the linearly moving member 23 of the actuator 9 to the left in FIG. 7, for example, the floor 21 can be rotated and raised by the push-up arm 22, and the crank handle 7 is rotated in the reverse direction. The floor 21 can be rotated and lowered by the reverse operation to the above.

  In such ascending / descending or raising / lowering operation, it is only necessary to obtain a predetermined displacement, and a constant controlled operation such as a constant speed operation is not necessarily required. By operating the actuator 9, the above-described floor portion 21 can be smoothly operated without causing the user on the bed to feel uncomfortable.

  In the electric bed of the present invention, the actuator 9 and the manual power generation device 1 provided with the crank handle 7 may be connected by the power feeding cable 8. Therefore, both the actuator 9 and the manual power generation device 1 have a degree of freedom in their installation. high. In this case, the power supply cable 8 can be connected and disconnected without using a connector as shown in FIG.

  For example, as shown in FIG. 9, the manual power generator 1 is installed on the end side in the longitudinal direction of the bed so that the crank handle 7 can be operated from the outside of the foot board 24 on the foot side of the bed. As shown in FIG. 4, the crank handle 7 can be installed from the side of the bed so that it can be operated at the end in the width direction of the bed, or can be installed at an appropriate place on the bed. Or, it is not installed immovably in the proper place of the bed, but it can be detachably supported in the proper place of the bed and can be removed by hand during use, making it very easy for the operator to operate the crank handle 7. be able to.

  In addition, in the electric bed of the present invention, when there are a plurality of places where the floor portion is lifted or lowered, for example, in FIG. 11, the floor portion to be rotated corresponds to the floor portion 21 and the thigh portion of the user. In such a case, the manual power generator 1 may be provided at a plurality of locations, in this case, each of the floor portions 21 and 26, or an actuator. In the configuration in which the connection of the power supply cable 8 to the power supply connector 12 is connected by the power supply connector 12 as described above, the actuator 9 to which the power supply connector 12 is connected is selected, so that the common manual power generator 1 can lift and lower the plurality of positions. Or it can be made to respond | correspond to undulation operation | movement. In addition, as shown in FIG. 12, the common manual power generator 1 and the DC motors of the plurality of actuators 9 can be easily connected by the power feeding cable 8 using the changeover switch 27.

The specifications of the embodiment of the manual power generator 1 described above will be described as follows.
Manual input: 10 to 50 [N]
Manual input shaft speed: 30 to 120 [rpm]
Reduction ratio (speed increase ratio): 1 / 15.5
Number of rotations of rotating shaft: 465 to 1860 [rpm]
Power generation: 10-30 [VA]

  In this embodiment, the speed increasing mechanism 4 constituting the manual power generator 1 is constituted by a worm gear mechanism in which the crank handle 7 side is a worm wheel 15 and the DC motor 2 side is a double threaded worm 16. The size and weight can be greatly reduced. For this reason, it is possible to realize the manual power generator 1 that can store the components in the container 5 that can be held by hand and satisfy the above-described specifications. it can.

  In the electric bed of the present invention, the manual power generator 1 has the same DC motor 2 and speed increasing mechanism 4 as the DC motor 10 and the speed reducing mechanism 14 of the actuator 9 that performs the raising / lowering and raising / lowering operations of the floor. It can be set as a structure, and a significant reduction in cost can be aimed at by carrying out like this.

  Since the present invention is as described above, the electric bed has a high degree of design freedom, including a position of a crank handle that is manually operated in the event of a power failure of the commercial power supply, and has a high performance and safety. It has a feature that it can be provided at a low cost, and is very highly usable as an electric bed for hospitals and homes.

DESCRIPTION OF SYMBOLS 1 Manual generator 2 DC motor 3 Rotating shaft 4 Speed increasing mechanism 5 Body 6 Input shaft 7 Crank handle 8 Power supply cable 9 Actuator 10 DC motor 11 Power supply side connector 12 Power supply connector 13 Power receiving connector 14 Deceleration mechanism 15 Worm wheel 16 Worm 17 Support member 18 Controller 19 Power supply cable 20 Floor support frame 21 Floor 22 Push-up arm 23 Linear motion member 24 Footboard 26 Floor 27 Switch

Claims (8)

In a bed that uses an actuator having a rotation-linear motion conversion mechanism for raising and lowering and raising and lowering the floor portion, the rotation side of the rotation-linear motion conversion mechanism of the actuator is configured by a DC motor and a speed reduction mechanism, to the DC motor An electric bed characterized in that power is selectively supplied by a controller connected to a commercial power source and a manual power generator driven by a crank handle. A plurality of actuators are installed corresponding to the elevation and undulation part, and the power supply to the DC motors of the plurality of actuators is performed by a controller connected to the commercial power source, and a changeover switch is connected from a common manual power generator. The electric bed according to claim 1, wherein the electric bed is selectively performed. The manual power generator stores a DC motor capable of reversible operation and a speed increasing mechanism connected to its rotating shaft in a container, and a crank connected to the input shaft of the speed increasing mechanism outside the container. A handle and a power supply cable connected to the power source side of the DC motor are provided, and a connector that can be connected to a power source side connector of the DC motor is provided at the front end side of the power supply cable. The electric bed according to claim 1 or 2. 4. The electric bed according to claim 3, wherein the speed increasing mechanism includes a worm wheel on the crank handle side and a worm on the DC motor side. The electric bed according to claim 4, wherein the worm is configured as a plurality of screws. 6. The electric bed according to claim 1, wherein the DC motor and the speed increasing mechanism of the manual power generator have the same configuration as the DC motor and the speed reducing mechanism of the actuator. The electric bed according to any one of claims 1 to 6, wherein the manual power generator is installed at an appropriate position of the bed where the crank handle can be operated. The electric bed according to any one of claims 1 to 6, wherein the manual power generator is configured to be detachably supported at an appropriate position of the bed.

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