JP2010273759A - Driving device for reclining bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device for a reclining bed, capable of at least freely tiltably driving a bed frame by a simple structure and capable of reducing loads on the driving device supporting the bed frame during tilting. <P>SOLUTION: The reclining bed 1 has the bed frame 4 which can be freely tilted and vertically lifted relative to a base 3 set on a floor surface. The driving device 2 for the reclining bed 1 includes: the first and second links 5 and 6 rotatably linked between the base 3 and the bed frame 4 and symmetrically disposed relative to a vertical surface V; the first and second telescopic actuators 7 and 8 rotatably linked between the base 3 and the bed frame 4 and symmetrically disposed relative to the vertical surface V; the first and second sliding mechanisms 9 and 10 capable of advancing linking points of the first and second links 5 and 6 to the bed frame 4, respectively, parallel in the direction of extension of the bed frame 4; and a restraining member 11 rotatably linked between the bed frame 4 and the first link 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reclining bed drive device, and more particularly to a reclining bed drive device that can be vertically raised and lowered or tilted.

  Patent Document 1 discloses a bed having a pair of parallel link mechanisms rotatably connected between a base and a bed frame so that the bed frame can be raised and lowered while swinging and tilted. . In this bed, when the bed frame is raised and lowered, the bed frame moves up and down while swinging by connecting the pair of parallel link mechanisms with a connecting rod and rotating the pair of parallel link mechanisms. On the other hand, when the bed frame is tilted, the connection by the connecting rod is manually released.

  Patent Document 2 discloses a pair of links that are connected between a base and a bed frame so as to be rotatable on the base side and are slidably connected along the front-rear direction on the bed frame side to form a square shape. A pair of actuators rotatably and telescopically connected between the bed frame and the pair of links, and a pair of regulating members rotatably connected between the bed frame and the pair of links (two The bed is disclosed in which the bed frame is vertically movable and tiltable.

Japanese Patent No. 3013926 JP 2005-65710 A

  According to the bed of Patent Document 1, a bed installation space exceeding the length of the bed in the front-rear direction is required by swinging the bed frame while moving up and down, that is, moving the bed frame in the front-rear direction. Also, there is a risk of instability to the user. In addition, according to the bed of patent document 1, in order to switch a raising / lowering mode and a tilt mode, manual operation regarding connection or cancellation | release of a connecting rod is required, and there also exists a problem that it takes an effort.

  According to the bed of Patent Document 2, since the pair of actuators are connected to the pair of links, the load of the bed frame and the user is eventually supported by the pair of links. In particular, when the bed is tilted or when the user sits at the end of the bed, a large load is applied to the pair of actuators and the pair of links, particularly the lower actuator and link. Further, the bed of Patent Document 2 has a problem that the number of members is large because the regulating members are connected to the pair of links, that is, the two regulating members are provided.

  Further, in the actuator that is lowered during tilting, for example, when the user moves to the lower end of the bed frame and a large load is applied to the end, the actuator has a larger tensile direction. A force is applied, and an undesirable load is applied to the actuator. The actuator is robust against the force in the compression direction, but is not relatively robust against the force in the tensile direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a reclining bed driving device that drives a bed frame at least in a tiltable manner with a simple configuration and that reduces the load on the driving device that supports the bed frame during tilting. is there. Another object of the present invention is to provide a reclining bed drive device that drives the bed frame vertically and tiltably with a simple configuration, and reduces the load on the drive device that supports the bed frame during tilting. Is to provide.

  In a first aspect, the present invention provides a reclining bed having a bed frame that can be vertically moved up and down and tilted with respect to a base installed on a floor surface. The first and second links arranged symmetrically with respect to a predetermined vertical plane, and connected to the base and the bed frame so as to be rotatable and extendable, respectively, and symmetrical with respect to the vertical plane. The first and second actuators, the first and second links, and the bed frame connected to each other are connected to each other along a direction in which the bed frame extends. A liner having a first and second slider mechanism and a restricting member rotatably connected between the bed frame and one of the first and second links To provide a bed of the drive unit.

  In a second aspect, the present invention provides a reclining bed having a bed frame that can be tilted with respect to a base installed on a floor surface. The reclining bed is rotatably connected between the base and the bed frame. First and second links arranged symmetrically with respect to the vertical plane of the head, an actuator pivotably and telescopically connected between the base and the bed frame, and between the base and the bed frame A third link that is pivotally coupled to the vertical plane and that is disposed symmetrically to the actuator with respect to the vertical plane, and a coupling point between the first and second links and the bed frame. Any of the first and second slider mechanisms, each of which can be translated along the extending direction, the bed frame, and the first and second links. Or having a rotatably linked regulating member between one to provide a driving device for reclining bed.

(1) By connecting a regulating member between the bed frame and one of the first and second links, the bed frame can be stabilized by a simple configuration with a reduced number of parts. Vertical up and down is achieved.
(2) By connecting the regulating member only between the bed frame and one of the first and second links, it is applied to one actuator or the third link during tilting. It is possible to reduce the load, particularly the load in the tensile direction.
(3) Since the actuator is connected between the bed frame and the base, the load applied to the link is reduced, and a robust drive device is provided.
(4) The drive device according to the first aspect of the present invention makes the reclining bed vertically movable and tiltable. The drive device according to the second aspect of the present invention is reclined by simplifying the structure in which one of the first and second actuators of the drive device of the first viewpoint is replaced with a mere third link. Make the bed tiltable.

It is a top view of the drive device of the reclining bed concerning Example 1 of the present invention. It is a mechanism figure of the drive device of the reclining bed concerning Example 1 of the present invention, and has shown the low floor state. It is an operation | movement diagram of FIG. 2, Comprising: The high floor state is shown. FIG. 3 is an operation diagram of FIG. 2 showing a tilt state. (A) is the elements on larger scale around the slot shown in Drawing 3, and (B) is the elements on larger scale around the slot shown in Drawing 4. It is a mechanism figure of the drive device of the reclining bed which concerns on Example 2 of this invention, Comprising: The tilt state is shown.

  According to the embodiment of the present invention, the connection point between one of the first and second actuators and the base is slidable. According to this aspect, when the bed frame is tilted, sliding of the one actuator and the bed frame is allowed to prevent a tensile force from being applied to the one actuator. . Further, according to this embodiment, when lowering one of the actuators, for example, the foot side from the low floor state in which the first and second actuators are contracted, the head side actuator is not driven and the head side is driven. Even if only the side actuator is extended, the bed frame can be tilted while reducing the load applied to the actuator.

  A reclining bed drive device according to an embodiment of the present invention includes a support member that is disposed on the base and is slidable with the bed frame when the bed frame is tilted. According to this aspect, at the time of tilting, the bed frame is supported by elements other than the actuator and the link, so the burden on the actuator and the link is reduced.

  According to the embodiment of the present invention, the restricting member is connected to a link disposed on the foot side of the first and second links. According to this embodiment, when the bed frame is vertically raised and lowered, the bed frame is stably raised and lowered, and when the bed frame is tilted to lower the foot side and raise the head side, the bed frame is particularly arranged on the foot side. It is possible to reduce the burden on the actuator and the link.

  According to the embodiment of the present invention, when providing a drive device for a reclining bed having only a tilt function, one of the first and second actuators is a third link, for example, non-extensible. Therefore, it is exchanged for a rigid body having the same length as the shortest length of one actuator. According to this embodiment, the function is limited, but an inexpensive reclining bet having a simple configuration is provided.

  According to the embodiment of the present invention, the first and second links and the first and second actuators are respectively arranged in a “C” shape.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a top view of a reclining bed driving apparatus according to an embodiment of the present invention. FIG. 2 is a mechanism diagram of a reclining bed according to an embodiment of the present invention, and shows a low floor state. FIG. 2 is a mechanism diagram corresponding to the side view of FIG. 1, but the order in which the elements are viewed is changed so that the link relationship between the elements becomes clear. The same applies to FIGS. 3 and 4 described later.

[overall structure]
Referring to FIGS. 1 and 2, the reclining bed 1 of the present embodiment has a bed frame 4 that can be vertically raised and lowered with respect to a base 3 installed on the floor surface. The drive device 2 of the reclining bed 1 includes first and second links 5 and 6 that are rotatably connected between a base 3 and a bed frame 4 and are symmetrically arranged with respect to a vertical plane V, and a base. 3 and the bed frame 4 are pivotally connected to each other, arranged symmetrically with respect to the vertical plane V, and extendable and contractable, and the first and second actuators First and second slider mechanisms 9 and 10 that can translate the connecting points of the links 5 and 6 and the bed frame 4 along the direction in which the bed frame 4 extends, and the bed frame 4 and the first link. And a restricting member 11 that is pivotably connected between the first member 5 and the second member 5.

  Referring to FIG. 1, the first and second links 5, 6 and the like are arranged symmetrically with respect to the vertical plane at the center in the width direction of the reclining bed 1. Therefore, in the following, with respect to the elements arranged in plane symmetry in this way, the element on one side will be mainly described, and the element on the other side will be referred to the description on the one side.

[base]
The base 3 includes a foot leg 3a, a head leg 3b, and an intermediate leg 3c that holds both the legs 3a and 3b constant by connecting the legs 3a and 3b. Yes. A foot bracket 3d and a head bracket 3e are attached to the intermediate leg 3c. An elongated hole 3f is formed in the foot side bracket 3d. A pin 7a, which is a connection point between the first actuator 7 and the base 3, is slidably engaged with the elongated hole 3f.

[Bed frame, first and second slider mechanisms]
A first guide rail 4 a is formed on the foot side of the bed frame 4. A second guide rail 4 b is formed on the head side of the bed frame 4. A first roller 5c that is pivotally supported by a pin 5b that is a connection point between the first link 5 and the bed frame 4 is slidably engaged with the first guide rail 4a. A second roller 6c that is pivotally supported by a pin 6b that is a connection point between the second link 6 and the bed frame 4 is slidably engaged with the second guide rail 4b. The first slider mechanism 9 includes a first guide rail 4a and a first roller 5c. The second slider mechanism 10 has a second guide rail 4b and a second roller 6c.

[First and second links]
One end of the first link 5 is rotatably connected to the base 3, in particular, the foot-side leg 3 a via a pin 5 a. The other end of the first link 5 is connected to the bed frame 4 via the first slider mechanism 9 so as to be able to rotate and translate. One end of the second link 6 is rotatably connected to the base 3, in particular, the head side leg 3b, via a pin 6a. The other end of the second link 6 is connected to the bed frame 4 via the second slider mechanism 10 so as to be able to rotate and translate. On the base 3, the pins 5a and 6a are located at the same height. On the bed frame 4, the pins 5b and 6b are located at the same height.

[First and second actuators]
The first and second actuators 7 and 8 are disposed in the center of the reclining bed 1 in the width direction. One end of the first actuator 7 is rotatably and slidably connected to the base 3, particularly the foot side bracket 3d, via a pin 7a and a long hole 3f. The other end of the first actuator 7 is rotatably connected to the bed frame 4 via a pin 7b. One end of the second actuator 8 is rotatably connected to the base 3, in particular, the head side bracket 3e via a pin 8a. The other end of the second actuator 8 is rotatably connected to the bed frame 4 via a pin 8b. On the base 3, the pins 7a and 8a are located at the same height. On the bed frame 4, the pins 7b and 8b are located at the same height. The first and second actuators 7 and 8 have cylinder sides connected to the bed frame 4 side and pistons connected to the base 3 side.

  In particular, the drive device 2 includes the first and second links 5 and 6, the first and second actuators 7 and 8, and the first and second slider mechanisms 9 and 10 in the ascending / descending direction of the bed frame 4. It is basically arranged symmetrically with respect to the intermediate plane along (the vertical plane having the normal line along the extending direction of the bed frame 4). The expansion / contraction direction of the first actuator 7 intersects the axial direction of the first link 5. The expansion / contraction direction of the second actuator 8 intersects the axial direction of the second link 6.

[Regulatory members]
One end of the regulating member (regulating arm) 11 is rotatably connected to the bed frame 4. The other end of the restricting member 11 is rotatably connected to the first link 5. In the bed frame 4, the connection point between the regulating member 11 and the bed frame 4 and the connection point between the first and second links 5 and 6 and the bed frame 4 are located at the same height. The connection point of the restricting member 11 with the first link 5 is located at the intermediate point of the first link 5 (intermediate point of the pins 5a and 5b).

[Tilted bed frame support structure]
A holder 12 is mounted on the base 3, particularly on the tip of the foot side leg 3 a. A support roller (support member) 13 is disposed in the holder 12. On the other hand, a support receiver (sliding plate) 14 is attached to the bottom of the bed frame 4 on the foot side. When the bed frame 4 is inclined at a predetermined angle, that is, tilted, the support roller 13 supports the bed frame 4 while sliding with the support receiver (sliding plate) 14.

  Next, operation | movement of the drive device 2 of the reclining bed 1 demonstrated above is demonstrated.

[Low floor]
Still referring to FIG. 2 showing the low floor state, the first and second actuators 7 and 8 are also in the contracted or shortest state, and the first and second rollers 5c and 6c are in the first and second states. The guide rails 4 a and 4 b are positioned closer to the center along the front-rear direction of the bed frame 4. As a result, the first and second links 5 and 6 are in a fallen state, and the bed frame 4 is in a low floor state. In the low floor state, the pin 7a, which is a connection point between the first actuator 7 and the base 3, is located closer to the center in the longitudinal direction of the bed frame 4 in the long hole 3f.

[At the time of high floor]
FIG. 3 is an operation diagram of FIG. 2 and shows a high floor state. Referring to FIGS. 2 to 3, when the first and second actuators 7 and 8 are similarly extended, the first and second actuators 7 and 8 rotate in directions opposite to each other. The second links 5 and 6 rotate in directions opposite to each other, and the first and second rollers 5c and 6c are disposed on the first and second guide rails 4a and 4b at both ends in the front-rear direction of the bed frame 4. Slide toward each other. As a result, the first and second links 5 and 6 stand while rotating in opposite directions to push the bed frame 4 into a raised floor state. In the elevated floor state, the pin 7a, which is a connection point between the first actuator 7 and the base 3, is located closer to the center along the longitudinal direction of the bed frame 4 in the elongated hole 3f.

[When tilting]
FIG. 4 is an operation diagram of FIG. 2 and shows a tilt state. 2 to 4, when the contracted state of the first actuator 7 on the foot side is maintained and the second actuator 8 on the head side is extended, the second actuator 8 is rotated counterclockwise in the figure. The second link 6 on the head side rotates clockwise in the figure, and the second roller 6c on the head side moves on the second guide rail 4b in the front-rear direction of the bed frame 4. Slide toward the head. As a result, the second link 6 stands up while rotating clockwise in the figure, and pushes up the head side of the bed frame 4 to bring the bed frame 4 into a tilted state where the foot side is low and the head side is high.

  5A is a partially enlarged view around the elongated hole shown in FIG. 2, and FIG. 5B is a partially enlarged view around the elongated hole shown in FIG. During the tilting operation, the pin 7a, which is a connection point between the first actuator 7 and the base 3, is moved along the longitudinal direction of the base 3 in the elongated hole 3f from the head side shown in FIG. Slide to the foot side as shown in). As a result, the first actuator 7 and the bed frame 4 are allowed to slide slightly toward the foot side, and a force in the tensile direction is prevented from being applied to the first actuator 7, and the tilt is smoothly performed. Executed. At this time, the first and second links 5 and 6 and the restricting member 11 restrict the bed frame 4 from excessively moving to the foot side.

  When the bed frame 4 is inclined to a predetermined angle and the foot side of the bed frame 4 is lowered to a predetermined height, the support receiver 14 on the bed frame 4 side is placed on the support roller 13 on the base 3 side. Thereafter, as the support roller 13 and the support receiver 14 slide, the bed frame 4 is further tilted while being stably supported. In order to change from the high floor state shown in FIG. 3 to the tilt state shown in FIG. 4, the first actuator 7 on the foot side may be reduced.

  FIG. 6 is a mechanism diagram of the drive device for the reclining bed according to the second embodiment of the present invention, and shows a tilted state. As for the driving device according to the present embodiment, the description of the first embodiment will be referred to as appropriate for the points common to the driving device of the first embodiment. Hereinafter, the driving device according to the first embodiment and the first embodiment will be mainly described. Differences between the driving devices will be described.

  Referring to FIG. 6, the drive device 2 for the reclining bed 1 according to the second embodiment of the present invention includes a second actuator 8 that is rotatably connected to the base 3 and the bed frame 4 and is extendable. In place of the first actuator 7 shown in FIG. 2, the first actuator 7 is rotatably connected between the base 3 and the bed frame 4 and symmetrically arranged with the second actuator 8 with respect to the vertical plane V. 3 links 15.

  A rigid body such as a pipe having the same length as the shortest length of the first actuator 7 shown in FIG. 4 can be adopted for the third link 15. According to the present embodiment, the tilting operation is realized with a simple configuration in which the number of actuators used is small.

  The drive device of the present invention is suitably used as a drive device for a general reclining bed, a nursing care or a reclining bed for a hospital.

DESCRIPTION OF SYMBOLS 1 Reclining bed 2 Drive device 3 Base 3a Foot side leg part 3b Head side leg part 3c Intermediate leg part 3d Foot side bracket 3e Head side bracket 3f Elongated hole 4 Bed frame 4a 1st guide rail (foot side guide)
4b Second guide rail (head side guide)
5 First link (foot side link)
5a pin (base connection point)
5b pin (connection point with bed frame)
5c 1st roller 6 2nd link (head side link)
6a pin (connection point with base)
6b pin (connection point with bed frame)
6c 2nd roller 7 1st actuator (foot side actuator)
7a pin (connection point with base)
7b pin (connection point with bed frame)
8 Second actuator (head side actuator)
8a pin (connection point with base)
8b pin (connection point with bed frame)
9 First slider mechanism 10 Second slider mechanism 11 Restriction member (regulation arm)
11a pin (connection point with bed frame)
11b pin (connection point with the first link)
12 Holder 13 Support roller 14 Support receiver (sliding plate)
15 Third link

Claims (5)

In a reclining bed having a bed frame that can be vertically raised and lowered with respect to a base installed on a floor surface,
A first link and a second link, which are rotatably connected between the base and the bed frame, and are symmetrically arranged with respect to a predetermined vertical plane;
A first actuator and a second actuator, which are pivotably and telescopically connected between the base and the bed frame, and are arranged symmetrically with respect to the vertical plane;
A first and a second slider mechanism that enable translational movement of the connecting points between the first and second links and the bed frame, respectively, along the extending direction of the bed frame;
A restricting member rotatably connected between the bed frame and one of the first and second links;
A drive device for a reclining bed, comprising:   The reclining bed driving device according to claim 1, wherein a connection point between one of the first and second actuators and the base is slidable.   The reclining bed driving device according to claim 1, further comprising a support member that is disposed on the base and is slidable with the bed frame when the bed frame is tilted.   The reclining bed drive device according to any one of claims 1 to 3, wherein the restricting member is connected to a link disposed on a foot side of the first and second links. In a reclining bed having a bed frame that is tiltable with respect to a base installed on the floor surface,
A first link and a second link, which are rotatably connected between the base and the bed frame, and are symmetrically arranged with respect to a predetermined vertical plane;
An actuator pivotably and telescopically connected between the base and the bed frame;
A third link pivotably connected between the base and the bed frame and disposed symmetrically to the actuator with respect to the vertical plane;
First and second slider mechanisms that respectively translate the connection points of the first and second links and the bed frame along the extending direction of the bed frame;
A regulating member rotatably connected between the bed frame and one of the first and second links;
A drive device for a reclining bed, comprising:

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