JP2010207541A - Electrical bed with lifting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical bed with a lifting mechanism which simultaneously attains lowering and a large lifting quantity (raising) of a base frame with a simple configuration, and is small in the output of an actuator required for raising and lowering the base frame. <P>SOLUTION: The lifting mechanism 10 is provided with a switching structure where an auxiliary link 18 supports the base frame 12 while the base frame 12 is lowered, the auxiliary link 18 and a lifting link 15 support the base frame 12 when switching from the auxiliary link 18 to the lifting link 15, and the lifting link 15 supports the base frame 12 while the base frame 12 is raised. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric bed provided with an elevating mechanism used for nursing care or the like.

  In recent years, electric beds used for nursing care equipped with an elevating mechanism have both a low floor for the purpose of preventing the cared person from falling and a sufficiently high floor for the purpose of reducing the burden of assistance work. It has been demanded.

  On the other hand, an electric bed equipped with a conventional lifting mechanism has guide members provided on the base toward the both ends, and the guide members have undulating leg members mounted on the upper ends so as to be movable. A short restricting arm is pivotably connected between the intermediate portion of the undulating leg member and the both ends of the base, compared to the undulating leg member, and the undulating leg member is positioned near the lower end of the undulating leg member. An auxiliary link having one end side movably attached to a guide member provided along the other end, and the other end side rotatably connected to the restricting arm, the upper end side of the hoisting leg member, and the auxiliary link An interval adjusting mechanism is provided between the one end sides of the hoisting leg member, and by adjusting the space between the upper end side of the hoisting leg member and the one end side of the auxiliary link by the interval adjusting mechanism, the upper end side of the hoisting leg member , One end side of the auxiliary link, the base and the undulating leg member respectively Is moved along the interior material, contoured to displace the angle between the leg member and the regulating arms are configured to adjust the base height (for example, see Patent Document 1.).

  In addition, a leg composed of a grounding part that is grounded to the floor surface and a leg part that is attached to the grounding part so as to be raised and lowered is arranged in the front and rear, and the front part and the rear part of the support frame that are long in the front and rear direction, A pair of front and rear legs are connected to each other on the same side and movable in the front-rear direction, and between the front part of the support frame and the front leg, and the rear part and the rear side of the support frame It is the structure provided with an expansion-contraction type actuator between each leg body (for example, refer patent document 2).

  Further, it is configured to be movable up and down via a fixed frame installed on the floor and a link mechanism including at least a pair of link members configured in a substantially X shape on the fixed frame, and supports the floor. A movable side frame, a drive arm for pushing up one link member of the pair of link members and operating the two link members apart from each other so as to be swingable. A telescopic part of a telescopic actuator for swinging the operating arm is connected to the tip of the operating arm that is swingably mounted around the same axis as the swing axis of the drive arm for swinging operation. In addition, the actuator is provided on the other link member (see, for example, Patent Document 3).

Japanese Patent No. 3575690 JP 2005-65710 A JP 2005-348893 A

  However, in an electric bed equipped with a conventional lifting mechanism, in order to increase the lifting amount of the base frame, it is necessary to lengthen the lifting link and increase the rotation angle during lifting, but the base frame has a low floor. In order to reduce the height from the floor surface at the time, there is a problem that the longer the link for raising and lowering, the smaller the angle with respect to the floor surface, and the greater the output of the actuator necessary for raising the base frame. Further, when the auxiliary link is used, the structure becomes complicated.

  The present invention has been made in view of the above problems, and it is possible to achieve both a reduction in the floor of the base frame and a large raising / lowering amount (increasing the floor) with a simple configuration. An object of the present invention is to provide an electric bed provided with a lifting mechanism with a small output of a required actuator.

  The first problem-solving means of the present invention includes a base frame on which a user is placed, a leg portion that is placed on the floor and supports the base frame, a first link that rotates about the leg portion as a fulcrum, An imaginary line connecting the end portion on the base frame side and the fulcrum forms an acute angle with respect to the first link and is shorter than the first link, and the end portion is centered on the fulcrum in conjunction with the first link. A second link that pivots to the first link, a first slider that is provided on the first link and is slidable with the base frame, and a second slider that is provided on the end of the second link and is slidable with the base frame. An elevating mechanism comprising a slider and an actuator coupled to at least one of the first link and the second link, and extending and contracting to rotate the first link and the second link; The lifting mechanism is Raised floor when the scan frame wherein the first link supporting the base frame, low floor when the base frame is a configuration in which the second link supporting the base frame.

  The second problem-solving means is configured such that the second link includes an auxiliary link fixed between the first slider and the fulcrum of the first link.

  The third problem solving means is configured such that one end of the actuator is connected to the end of the second link.

  The fourth problem-solving means is configured such that the other end of the actuator is provided on the floor side from the one end of the actuator.

  The fifth problem solving means is configured such that the elevating mechanism is provided on each of the head side and the foot side of the base frame and is independently controlled.

  In the present invention, the lifting mechanism of the electric bed includes a switching structure in which the first link supports the base frame when the base frame is high, and the second link supports the base frame when the base frame is low. With a single actuator, it is possible to achieve both a reduction in the floor of the base frame and a large raising / lowering amount (increasing the floor). Also, when the base frame is at a low floor, the second link slider at the end of the second link is in contact with the base frame, and the second link is shorter than the first link. The link angle β formed by the imaginary line connecting the fulcrum that is the center of rotation and the end of the second link and the horizontal line is larger than the link angle of the first link, and the output of the actuator during elevation can be reduced.

  In addition, by configuring the second link with an auxiliary link fixed between the first slider and the fulcrum of the first link, the length of the auxiliary link can be shortened and the floor can be lowered. Moreover, regardless of the length of the first link, the auxiliary link can be attached in an upright state even when the bed height is low.

  In addition, by connecting one end of the actuator to the end of the second link, the angle γ formed by the imaginary line connecting the fulcrum that is the rotation center of the first link and the end of the second link and the expansion / contraction direction of the actuator is small. Thus, since the expansion / contraction direction of the actuator approaches the tangential direction of the rotation trajectory of the end portion of the second link, the output of the actuator during ascent / descent can be reduced.

  Further, by providing the other end of the actuator on the floor side from the one end of the actuator, the imaginary line connecting the fulcrum that is the rotation center of the first link and the end of the second link further than the third problem solving means and the actuator. The angle γ formed with the expansion / contraction direction becomes small, and the expansion / contraction direction of the actuator becomes closer to the tangential direction of the rotation locus of the end portion of the second link, so that the output of the actuator during ascent / descent can be reduced.

  In addition, the elevating mechanism is provided on the head side and the foot side of the base frame, respectively, and is controlled independently, so that the base frame is moved up and down horizontally, and the head side and foot side actuators are A desired inclination can be given to the base frame by changing the amount of expansion and contraction. For example, you can easily get on and off the bed.

It is explanatory drawing which shows the side surface of the low floor state of the electric bed provided with the raising / lowering mechanism of this invention. It is explanatory drawing which shows the side surface of the switching state from the auxiliary link of the electric bed provided with the raising / lowering mechanism of this invention to the raising / lowering link. It is explanatory drawing which shows the side surface of the elevated floor state of the electric bed provided with the raising / lowering mechanism of this invention. It is explanatory drawing which shows the side surface of the state which controlled the raising / lowering mechanism of the head side of this invention, and the leg side independently. It is a graph which shows the relationship between the angle (180 degree-gamma) of an actuator, and an actuator output.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1-4 is explanatory drawing which shows the side surface of the electric bed 1 provided with the raising / lowering mechanism 10 of this invention. 1 is a low floor state of the electric bed 1, FIG. 2 is a switching state from the auxiliary link 18 to the lifting link 15, FIG. 3 is a high floor state of the electric bed 1, and FIG. It is in a controlled state. The same parts and functions will be described using the same reference numerals.

  The lifting mechanism 10 of the electric bed 1 includes a base frame 12 on which a user is placed and a guide rail 11 is provided on the floor surface, a leg portion 13 that is placed on the floor surface and supports the base frame 12, and a leg portion 13. A lift link 15 (first link) that rotates around the fulcrum 14 and a virtual line 17 that connects the end 16 on the base frame 12 side and the fulcrum 14 form an acute angle α with respect to the lift link 15 and the lift link 15. The auxiliary link 18 (second link) whose end 16 is rotated around the fulcrum 14 in conjunction with the lifting link 15 and the guide rail 11 of the base frame 12 provided on the lifting link 15 is slidable. An elevating link slider 19 (first slider), an auxiliary link slider 20 (second slider) provided at the end portion 16 of the auxiliary link 18 and slidable with the guide rail 11 of the base frame 12, and an auxiliary In conjunction with the end portion 16 of the link slider 20, it expands and contracts constituted the lifting link 15 and the auxiliary link 18 from the actuator 21 that rotates integrally.

  The auxiliary link 18 is configured to be fixed between the lifting link slider 19 of the lifting link 15 and the fulcrum 14 (intermediate) by bolts, welding, or the like, but rotates around the fulcrum 14 as indicated by a virtual line 17. It is also possible to use a link. Moreover, it is also possible to give the lift link 15 and the auxiliary link 18 the same effect by using a single plate.

  One end 22 of the actuator 21 is connected to the end portion 16 of the auxiliary link 18, and the other end 23 is connected to the actuator bracket 24, and is provided on the floor surface side from the one end 22 of the actuator 21. The lifting mechanism 10 provided independently on the head side and the foot side is controlled independently.

  The elevating mechanism 10 is configured such that the auxiliary link 18 supports the base frame 12 when the base frame 12 is at a low floor (FIG. 1), and the auxiliary link 18 and the elevating link when switching from the auxiliary link 18 to the elevating link 15 (FIG. 2). 15 has a switching structure in which the elevating link 15 supports the base frame 12 when the base frame 12 is elevated (FIG. 3).

  Operation | movement of the raising / lowering mechanism 10 of the electric bed 1 of this invention is demonstrated using FIGS. 1-4. In addition, since the raising / lowering mechanism 10 is the same thing installed on the head side and the foot side with the center of the base frame 12 as an axis | shaft, operation | movement of the raising / lowering mechanism 10 on the head side is demonstrated and operation | movement on the foot side is demonstrated. Omitted.

  When the one end 22 which is the movable part of the actuator 21 extends to the upper left in FIG. 1 from the low floor state in FIG. 1, the auxiliary link slider 20 slides along the guide rail 11 in the left direction in FIG. Since the auxiliary link 18 is fixed in the middle of the lifting link 15 by bolts, welding, or the like, the auxiliary link 18 rotates counterclockwise around the fulcrum 14 as the auxiliary link slider 20 slides, The frame 12 rises.

  When the one end 22 of the actuator 21 continues to extend to the upper left, the elevating link 15 and the auxiliary link 18 rotate counterclockwise about the fulcrum 14, and the elevating link slider 19 provided on the elevating link 15 slides with the guide rail 11. It touches as possible (FIG. 2).

  When the one end 22 of the actuator 21 continues to extend to the upper left, the elevating link 15 and the auxiliary link 18 rotate counterclockwise about the fulcrum 14, and the auxiliary link slider 20 provided at the end 16 of the auxiliary link 18 is Move away from the guide rail 11. Then, the base frame 12 is supported by the elevating link 15 and rises to a raised floor state (FIG. 3).

  Although the ascending operation of the base frame 12 from the low floor state to the high floor state has been described with reference to FIGS. 1 to 3, the descending operation of the base frame 12 from the high floor state to the low floor state is the opposite of the ascending operation.

  FIG. 4 shows a case where only the head-side actuator 21 is extended from the low floor state of FIG. The head-side and foot-side lifting mechanisms 10 can be controlled independently, and when only the head-side actuator 21 is extended, only the head side of the base frame 12 can be raised.

  In the electric bed 1 provided with the lifting mechanism 10 of the present invention, the base frame 12 is switched between the lifting link 15 and the auxiliary link 18 by switching the support of the base frame 12, thereby reducing the floor of the base frame 12 and increasing the lifting amount ( Higher flooring) can be achieved. Further, when the base frame 12 is at a low floor, the auxiliary link slider 20 at the end portion 16 is in contact with the guide rail 11 of the base frame 12, and the auxiliary link 18 is shorter than the lift link 15. The link angle β formed by the imaginary line 17 connecting the fulcrum 14 and the end 16 and the horizontal line is larger than the angle formed by the lifting link 15 and the horizontal line, and the output of the actuator 21 during lifting can be reduced.

  Further, since the auxiliary link 18 is fixed in the middle of the elevating link 15, the length of the auxiliary link 18 can be shortened and the floor of the base frame 12 can be reduced. Further, the space on the floor side of the base frame 12 can be effectively utilized. Further, regardless of the length of the lift link 15, the auxiliary link 18 can be attached in a standing state (vertical) even when the height of the base frame 12 is low.

  Further, by connecting the one end 22 of the actuator 21 to the end 16, the angle γ formed by the virtual line 17 and the expansion / contraction direction of the actuator 21 is reduced, and the expansion / contraction direction of the actuator 21 is the rotation locus of the end 16. Therefore, as shown in FIG. 5, the angle γ is reduced, and the output of the actuator 21 during elevation can be reduced.

  In addition, by providing the other end 23 of the actuator 21 on the floor side with respect to the one end 22 of the actuator 21, the angle γ formed by the virtual line 17 and the expansion / contraction direction of the actuator is further reduced, and the expansion / contraction direction of the actuator 21 is Since the tangential direction of the rotation locus of the end portion 16 of the auxiliary link 18 is closer, the output of the actuator 21 at the time of raising and lowering can be reduced.

  In addition, the elevating mechanism 10 is provided on the head side and the foot side of the base frame 12 and is controlled independently, so that the base frame 12 is raised and lowered in the horizontal direction, and the head side and the foot side. The base frame 12 can be given a desired inclination by changing the amount of expansion / contraction of the actuator 21. For example, it is possible to easily get on and off the bed.

DESCRIPTION OF SYMBOLS 1 Electric bed 10 Lifting mechanism 12 Base frame 13 Leg 14 Supporting point 15 Lifting link (first link)
16 End 17 Virtual line 18 Auxiliary link (second link)
19 Lift link slider (first slider)
20 Auxiliary link slider (second slider)
21 Actuator

Claims (5)

A base frame on which the user is placed;
Legs that are placed on the floor and support the base frame;
A first link that rotates about the leg as a fulcrum;
An imaginary line connecting the end portion on the base frame side and the fulcrum forms an acute angle with respect to the first link and is shorter than the first link, and the end portion is centered on the fulcrum in conjunction with the first link. A second link that pivots to
A first slider provided on the first link and slidable with the base frame;
A second slider provided at the end of the second link and slidable with the base frame;
An elevator mechanism connected to at least one of the first link and the second link, and configured to extend and contract and rotate the first link and the second link;
The elevating mechanism is an electric bed in which the first link supports the base frame when the base frame is high and the second link supports the base frame when the base frame is low. 2. The electric bed according to claim 1, wherein the second link includes an auxiliary link fixed between the first slider of the first link and the fulcrum. The electric bed according to claim 1 or 2, wherein one end of the actuator is connected to the end of the second link. The electric bed according to claim 3, wherein the other end of the actuator is provided closer to the floor surface than the one end of the actuator. 5. The electric bed according to claim 1, wherein the elevating mechanism is provided on each of a head side and a foot side of the base frame and is controlled independently.

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