JP2013078450A - Manual bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand the flexibility of design because the flexibility of the design including the installation position of a crank handle or an actuator is limited in a conventional manual bed.SOLUTION: In this manual bed, the upward/downward or rise/fall operation of a floor part 19 is performed by use of the actuator 9 having a rotation-linear movement conversion mechanism. In the bed, the rotation side of the rotation-linear movement conversion mechanism of the actuator comprises a DC electric motor and a deceleration mechanism, and the power supply to the DC electric motor is performed by a manual power generator 1 driven by the crank handle 7. The manual power generator stores the reversibly operable DC electric motor and an acceleration mechanism in a body 5, and is provided with the crank handle connected to an input shaft of the acceleration mechanism and a power supply cable 8, outside the body. The acceleration mechanism is configured by a worm gear mechanism wherein the crank handle side is a worm wheel, and wherein the DC electric motor side is a worm having a plurality of screw threads to drastically reduce size and weight.

Description

  The present invention relates to a manual bed for hospital use, home use, etc., in which raising and lowering and raising / lowering operations of a floor portion are manually performed using a crank handle.

  BACKGROUND ART Conventionally, various types of manual beds for hospitals, homes, etc., in which the floor is lifted or lowered manually using a crank handle, have been proposed and used. In such a manual bed, the screw shaft is rotated by the crank handle, so that the female screw engaged with the screw shaft is directly moved, and the arm or the like for raising and lowering the floor and raising and lowering is moved forward and backward. An actuator having a rotation-linear motion conversion mechanism is widely used.

  The drive end of the screw shaft of the actuator is supported by a floor support frame or the like by a gimbal mechanism or the like, and a crank handle is connected to the drive end. In the configuration in which the drive end of the screw shaft is supported near the end in the longitudinal direction of the bed, the crank handle can be directly connected to the drive end of the screw shaft, but the drive end is located on the inner side. In this case, it is necessary to interpose a rigid rod between the crank handle and the drive end of the screw shaft.

  For example, in the bed of Patent Document 1, since the screw shaft is provided closer to the head side of the bed and the crank handle of the actuator is provided at the foot side end, a long drive is provided between the crank handle and the screw shaft. A bar is provided.

  As described above, in the conventional manual bed, there is a restriction on the position where the crank handle is installed. Therefore, there is a restriction on the installation position of the actuator, and a rigid rod must be interposed between the crank handle and the actuator. Therefore, the degree of freedom in designing the entire bed is low.

Japanese Examined Patent Publication No. 6-40849

  The problem to be solved by the present invention is that the conventional manual bed has a low degree of design freedom including the installation position of the crank handle and the actuator, and the present invention aims to expand this degree of freedom. .

  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 a manual bed that consists of a DC motor and a speed reduction mechanism, and that uses a manual power generator driven by a crank handle to supply power to the DC motor.

  In the present invention, in the above-described configuration, a plurality of actuators are installed corresponding to the elevation and undulation sites, and power supply to the DC motors of the plurality of actuators is selected from a common manual power generator via a changeover switch. A manual bed 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 a manual bed with a built-in configuration.

  In the present invention, in the above configuration, the speed increasing mechanism proposes a manual 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. Suggest a manual bed.

  The present invention also proposes a manual bed in which the DC motor and speed reduction mechanism of the actuator and the DC motor and speed increasing mechanism of the manual power generator are the same in the above configuration.

  Further, in the present invention, in the above configuration, the manual power generator proposes a manual bed in which 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 the manual bed according to the present invention, the crank handle of the power generator is rotationally driven to generate DC power, and the DC motor constituting the actuator is rotationally driven by this DC power, via the rotation-linear motion conversion mechanism. Move the floor up and down and make ups and downs.

  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 addition, when using a bed for a specific patient (for example, a patient with dementia) who is in danger of operating the bed, the bed is equipped with the manual power generator according to the present invention or the crank handle for operating the manual power generator. By avoiding this, only a predetermined operator having a manual power generator or a crank handle can perform the operation, and safety can be ensured.

  In addition, when the DC motor of the actuator is operated by a commercial power supply, a necessary control circuit or the like is unnecessary, so that the cost is lower than that of a so-called electric bed.

  In the manual bed of the present invention, when there are a plurality of places where the floor portion is moved up and down and the undulation operation is performed, a manual power generation device may be provided for each operation, and a power supply cable is connected to the manual power generation device. By making it possible to select by the connector, it is possible to cope with the operation 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 direct current motor and the speed reduction mechanism of the actuator and the direct current motor and the speed increase mechanism of the manual power generator can be configured in the same manner, and thus the cost can be significantly reduced.

  Furthermore, in the present invention, when an abnormal load is applied to the actuator, such as when a human part is sandwiched between floor portions, the increase in the load appears as an increase in the required torque of the crank handle of the manual power generator, As a result, an abnormality can be detected, and the crank handle and the actuator are not directly coupled mechanically, so that safety is high.

FIG. 1 is an explanatory view conceptually showing the configuration and operation of an example of a manual power generator used for a manual 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 manual bed according to the present invention. FIG. 3 is a longitudinal sectional view of an example of the manual power generator used for the manual 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 a manual 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 a manual bed according to the present invention. FIG. 6 is a left side view showing the configuration of a DC motor and a speed increasing mechanism, which are components of an example of a manual power generator used in a manual bed according to the present invention. FIG. 7 is an explanatory view conceptually showing an embodiment of the manual bed of the present invention. FIG. 8 is an explanatory diagram conceptually showing a state where the manual power generator is installed on the bed in the embodiment of the manual bed of the present invention. FIG. 9 is an explanatory view conceptually showing another state in which the manual power generator is installed on the bed in the embodiment of the manual bed of the present invention. FIG. 10 is an explanatory view conceptually showing another embodiment of the manual bed of the present invention.

  Next, an embodiment of a manual bed according to the present invention will be described with reference to the accompanying drawings. First, a manual 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 portion in the manual 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. 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 manual bed of the present invention. In this figure, a floor portion that is rotatably supported by the floor portion support frame 18 and corresponds to the back of the user. 19 shows a configuration in which 19 is rotated by a linear motion member 21 of an actuator 9 connected to a push-up arm 20 provided on the lower side of the rotation fulcrum side.

  In the above configuration, in the manual bed according to the present invention, the manual power generator 1 connects the power supply connector 12 of the power supply cable 8 to the power supply side connector 11 of the DC motor 10 constituting the actuator 9, as shown in FIG. After that, the container 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 to rotate the rotor of the DC generator 2 to generate an electromotive force, and the generated DC power constitutes an actuator 9 through the power supply cable 8. The actuator 9 is operated by being supplied to the DC motor 10.

  Thus, by moving the linear motion member 21 of the actuator 9 to the left in FIG. 7, for example, the floor portion 19 can be rotated and raised by the push-up arm 20, and the crank handle 7 is rotated in the reverse direction. The floor portion 19 can be pivoted and lowered by an operation reverse 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 19 can be smoothly operated without causing the user on the bed to feel uncomfortable.

  In the manual 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, so that 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, in addition to being attachable / detachable by the connector as described above.

  For example, as shown in FIG. 8, 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 22 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.

  Further, in the manual bed of the present invention, when there are a plurality of places where the floor portion is lifted or lowered, for example, in FIG. 10, the floor portion to be rotated corresponds to the floor portion 19 and the user's thigh. 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 19 and 23, and the 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. Further, as shown in FIG. 10, the connection between the common manual power generator 1 and the DC motors of the plurality of actuators 9 by the power feeding cable 8 can be easily performed using the changeover switch 24.

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.

  Further, in the manual bed of the present invention, the manual power generator 1 is configured so that the DC motor 2 and the speed increasing mechanism 4 constituting the same are the same as the DC motor 10 and the speed reducing mechanism 14 of the actuator 9 that lifts and lowers 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, there is a feature that it is possible to provide a high-performance and high-safety manual bed at a low cost with a very high degree of design freedom including the installation position of the crank handle and the actuator. It is very useful as a manual 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 Feeding cable 9 Actuator 10 DC motor 11 Power supply side connector 12 Feeding connector 13 Power receiving cable 14 Deceleration mechanism 15 Worm wheel 16 Worm 17 Support member 18 Floor support frame 19 Floor 20 Push-up arm 21 Linear motion member 22 Footboard 23 Floor 24 Changeover 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 A manual bed characterized in that power is fed by a manual power generator driven by a crank handle. A plurality of actuators are installed corresponding to the raising and lowering and undulation sites, and the power supply to the DC motor of the plurality of actuators is selectively performed from a common manual power generator via a changeover switch. The manual bed according to claim 1. 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 manual bed according to claim 1 or 2. 4. The manual bed according to claim 3, wherein the speed increasing mechanism is configured with a worm wheel on the crank handle side and a worm on the DC motor side. 5. The manual bed according to claim 4, wherein the worm is configured as a plurality of screws. 6. The manual bed according to claim 1, wherein the direct current motor and the speed reduction mechanism of the actuator and the direct current motor and the speed increase mechanism of the manual power generator have the same configuration. The manual bed according to any one of claims 1 to 6, wherein the manual power generator is installed at a proper position of the bed where the crank handle can be operated. The manual 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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