JPH04371104A - Bed device - Google Patents

Abstract

PURPOSE:To produce a bed device which can vertically move a bed frame vertically movably provided above a basic body without horizontally sliding the bed frame. CONSTITUTION:The ends on the one sides of the third and fourth arms 13,14 are connected to the first and second shafts 3,4 rotatably provided on a basic body 1 rotated by a driving mechanism 8. The other ends of the arms 13,14 are severally connected to a bed frame rotatably and slidably in a horizontal direction, and the one end of the fifth arm 21 is pivotally mounted on the middle of at least either of the arms, and the other end of the arm 21 is pivotally mounted on the bed frame 18.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed device in which the height of a bed frame on which bedding is placed can be adjusted.

0002

BACKGROUND OF THE INVENTION For example, in a bed apparatus used as an examination table or a treatment table, it is convenient if the height of the bed frame on which bedding is placed can be adjusted during examination or treatment.

[0003] Conventionally, as a bed device that can move a bed frame up and down, the present applicant has developed a
We proposed what is shown in Publication No. 9134. The bed device disclosed in this publication has a structure in which the bed frame is vertically movable and the inclination angle can be adjusted.

The vertical drive of the bed device will be briefly explained with reference to FIG. 5. That is, the bed device has a base 51 supported by casters 50 and a bed frame 52 disposed above the base 51. A horizontal rod 53 with both ends fixed is installed across the base 51 in the width direction. One end of a gas spring 54 serving as a driving source is pivotally attached to this horizontal rod 53. This gas spring 54
One end of a first connecting rod 56a and one end of an operating rod 57 are pivotally connected to the operating shaft 55. One end of a second connecting rod 56b is pivotally attached to the other end of the operating rod 57. The other ends of the first and second connecting rods 56a and 56b are
They are connected and fixed to a first shaft 58 and a second shaft 59, respectively, which are rotatably provided on the base body 51.

One end of a first arm 60 is connected and fixed to each of the first shaft 58 and the second shaft 59. One end of a second arm 61 is pivotally connected to the other end of each first arm 60. The other end of the second arm 61 is rotatably connected to one end and the other end of a bed frame 52 disposed above the base 51, respectively. When the actuating shaft 55 is driven in the projecting direction by the gas spring 54 and the pair of first arms 60 are rotated in the counterclockwise direction shown by the arrow, the second arm 61 is driven in the upward direction. be done. Thereby, the bed frame 52
can be raised.

Furthermore, the operating shaft 5 of the gas spring 54
When the bed frame 5 is driven in the retracting direction, the second arm 61 is driven in the lowering direction, which is the opposite direction to the previous one, and the bed frame 52 is moved down in conjunction with the second arm 61.

By the way, according to such a configuration, the vertical movement of the bed frame 52 is caused by the first and second shafts 58 and 59.
It is interlocked with a pair of first arms 60 that rotate about the fulcrum. When the bed frame 52 is linked to the arcuate movement of the first arm 60, it not only moves up and down horizontally but also as shown in FIG.
It moves up and down while sliding horizontally as shown by the chain line. That is, one end surface 52a of the bed frame 52 in the longitudinal direction protrudes horizontally by the dimension X during the vertical movement than in the lowered position and the raised position.

[0008] Therefore, the end surface 52 of the bed frame 52
Since it is necessary to secure enough space on the a side for this bed frame 52 to swing, not only is a large installation space required, but also without securing enough space. There have been cases where the end surface 52a has been hit against a wall.

[0009]

[Problems to be Solved by the Invention] As described above, since the conventional bed device has a structure in which the bed frame moves up and down while sliding horizontally, extra space can be secured in the horizontal direction of the bed frame. There was something I had to do.

The present invention was made based on the above circumstances, and its object is to provide a bed device that allows the bed frame to be moved up and down without horizontally sliding it. be.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a base body in which a first axis and a second axis are provided in parallel and rotatably; a first arm to which is fixed, a second arm having one end fixed to the second shaft, one end of the first arm and the second arm; It has a connecting member whose both ends are rotatably connected to the other end, and a drive shaft that is driven forward and backward, and the tip of the drive shaft is rotated to the other end of the first arm. a drive mechanism movably connected to the connecting member; a third arm and a fourth arm each having one end fixed to the first shaft and the second shaft; , the third arm and the fourth arm are arranged horizontally above the base body, and the other ends of the third arm and the fourth arm are connected to each other so as to be rotatable and slidable in the horizontal direction. - a bed frame that is driven in the vertical direction in conjunction with the rotation of the arm, and one end of which is pivotally connected to the middle of at least one of the third arm and the fourth arm; The present invention is characterized by comprising a fifth arm which is pivotally attached to the bed frame and prevents the bed frame from sliding in the horizontal direction when the bed frame is driven in the vertical direction.

0012

[Operation] According to the above configuration, the third arm and the fourth arm
When the bed frame swings and the bed frame is driven up and down,
This is because each of the arms is allowed to slide horizontally relative to the bed frame, and the fifth arm prevents the bed frame from sliding horizontally relative to the base. When the bed frame is driven up and down, it does not slide horizontally.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The bed device shown in FIGS. 1 and 2 has a base 1 in the shape of a rectangular frame. Casters 2 are provided at the four corners of the base 1, so that the base 1 can be moved freely.

The base body 1 rotatably supports a first shaft 3 and a second shaft 4, which are arranged parallel to each other and spaced apart from each other along the width direction of the base body 1. A pair of first arms 5 are fixed to the first shaft 3 at a midway portion, and the second
A second arm 6 is attached to the shaft 4 at one end thereof.

The other end of the first arm 5 projects toward the lower surface of the base 1, and one end of a prismatic connecting member 7 is pivotally attached to the other end. The other end of the connecting member 7 is pivotally connected to one end of the second arm 6 that projects toward the lower surface of the base 1.

A drive mechanism 8 is provided on the upper surface of the intermediate portion of the connecting member 7. This drive mechanism 8 has a drive source 9 that integrates a motor and a speed reducer (both not shown). One end side of the housing 9a of the drive source 9 is rotatably connected to a bracket 10 provided on the upper surface of the connecting member 7.

A sleeve 11 is provided at the other end of the housing 9a of the drive source 9. One end of a drive shaft 12 is slidably provided on the sleeve 11. The drive shaft 12 is driven forward and backward in the axial direction by the operation of the drive source 9.

That is, a female threaded body (not shown) which is rotationally driven by the drive source 9 is provided within the sleeve 11 . A male threaded portion (not shown) formed at one end of the drive shaft 12 is screwed into this female threaded body. Further, the drive shaft 12 is held non-rotatably and slidably in the axial direction relative to the sleeve 11. Therefore, when the motor 8 operates and the female threaded body is rotationally driven, the drive shaft 12 is driven forward and backward in the axial direction.

The distal end of the drive shaft 12 is pivotally connected to the other end of a first arm 5 provided on the first shaft 3. Therefore, when the drive shaft 12 is driven in the protruding direction from the state shown in FIG. 1, the first arm 4 is rotationally driven in the clockwise direction shown by arrow a in FIG. .

One end of a pair of third arms 13 is fixed to both ends of the first shaft 3, and a pair of fourth arms 14 are fixed to both ends of the second shaft 4. One end is fixed. The other end of the third arm 13 is fixed to both ends of the first interlocking shaft 15, and the other end of the fourth arm 14 is fixed to both ends of the second interlocking shaft 16. There is.

Rollers 17 are rotatably provided at both ends of the first and second interlocking shafts 15 and 16, respectively. Each roller 17 is rotatably engaged with a rail 19 provided on both inner surfaces of a bed frame 18 disposed above the base 1.

One third arm 13 and the fourth arm 1
One end of a fifth arm 21 is pivotally connected to the end of the fifth arm 21 via a first connecting shaft 21a. This fifth arm 2
1 is attached to the inner surface of one side of the bed frame 18.
are pivotally connected via a connecting shaft 21b. therefore,
The fifth arm 21 is arranged so that the bed frame 18 can freely slide horizontally and the rollers 17 provided at both ends of the first and second interlocking shafts 15 and 16 can be moved from the rail 19. It prevents it from coming off.

[0023] The fifth arm 21 is connected to the third arm 21.
The length is set to be half the length of the third arm 13, and one end thereof is pivotally attached to a half point (center) of the third arm 13 in the length direction. As a result, the length of the fifth arm 21, indicated by X in FIG. 4, is the same as half the length of the third arm 13, indicated by Y.

Although not shown, a mattress may be placed on the upper surface of the bed frame 18, for example, via a floorboard, or via an auxiliary frame having a back-raising function and a leg-raising function. It has become so.

Next, the operation of the bed device having the above structure will be explained. When the bed frame 18 is raised from the state shown by the solid line in FIG. 3, the drive source 9 of the drive mechanism 8 is activated to drive the drive shaft 12 in the direction of protruding from the sleeve 11. When the drive shaft 12 is driven in the projecting direction, the first arm 5 fixed to the first shaft 3 rotates in the clockwise direction shown by arrow a in FIG. A connecting member 7 whose one end is connected to the other end slides in the direction shown by arrow b. When the connecting member 7 slides, the second arm 6 connected to the connecting member 7 rotates in the same clockwise direction as the first arm 5.

In this way, the first arm 5 and the second arm
When the arm 6 rotates clockwise, the first shaft 3 and the second shaft 4 are interlocked with these rotations. These first and second axes 3
, 4 rotate, the third arm provided on the first shaft 3 rotates.
Since the arm 13 and the fourth arm 14 provided on the second shaft 4 rotate in the direction of standing up from the collapsed state, each arm 1
The first and second interlocking shafts 15 and 16 connected to 3 and 14 are displaced upward.

When the first and second interlocking shafts 15 and 16 are displaced upward, the bed frame 18 is interlocked with the displacement, so that the bed frame 18 is moved from the position shown by the solid line in FIG. 3 to the position shown by the chain line. Can be raised to position.

By the way, when the bed frame 18 is raised, when the third arm 13 rotates about the end connected to the first shaft 3 as a fulcrum, the roller 17 provided at the other end is rotated. - Slide rule 19. Therefore, bed frame 1
8 rises without being slid in the horizontal direction relative to the base 1. Moreover, the bed frame 18
A fifth arm 21, one end of which is pivotally connected to the middle of the third arm 13, is pivotally connected to the other end. Therefore, even if a horizontal external force is applied to the bed frame 18, the bed frame 18 will not slide horizontally.

The length a of the fifth arm 21 is set to be the same as the half length b of the third arm 13,
One end of the third arm 13 is pivotally connected to the center of the third arm 13 in the longitudinal direction.

On the other hand, as shown in FIG. 4, the pivot point of the third arm 13 is A, the middle point is B, the other end to which the roller 17 is attached is C, and one end is at the middle point B. If the other end of the connected fifth arm 21 is D, AB=BD, BD=B
Since C, triangle ABD (AB'D') and triangle B
CD(B'C'D') are both isosceles triangles.

Therefore, when the third arm 13 is rotated upward from the collapsed state in the standing direction, each of the above triangles maintains an isosceles triangle shape, so that the other end D of the fifth arm 21 is As shown by the arrow, it is vertically displaced to an upper point D', and points C and D are displaced to upper points C' and D' while maintaining substantially the same height in the horizontal direction. Thereby,
The bed frame 18 can be raised in a horizontal state without sliding in the horizontal direction.

[0032] Also, the raised bed frame 18
Even when the bed frame 18 is driven in the downward direction, the above-mentioned conditions are maintained and the bed frame 18 does not tilt or slide horizontally.

If the bed frame 18 is driven up and down in this way, the bed frame 18 can be moved up and down without having to secure an extra space at the longitudinal end of the bed frame 18. , the space required to install the bed device can be reduced.

Note that the present invention is not limited to the above-mentioned embodiment, and can be modified in various ways. For example, in the above embodiment, the fifth arm is connected to only one third arm.
A fifth arm may be connected to each of the pair of third arms.

[0035] Also, the other ends of the third and fourth arms are connected to the first and fourth arms.
Although it is slidably and rotatably connected to the bed frame via the second interlocking shaft and the roller, a roller is directly provided at the other end of each arm, and these rollers are It may also be configured to be slidably engaged with the lever. In other words, the first
, the second interlocking axis may not be used.

[0036]

Effects of the Invention As described above, the present invention allows the third and fourth arms, which are rotated by a drive mechanism to move the bed frame up and down, to be rotated relative to the bed frame. In addition to being movably and slidably connected, one end of the fifth arm is pivotally connected to the middle part of at least one of these arms, and the other end is pivotally connected to the bed frame. , the bed frame is driven up and down by the fifth arm without sliding in the horizontal direction.

In other words, since the bed frame is vertically driven up and down without moving in an arc as in the conventional case, there is no need to secure extra space at the end of the bed frame, which reduces the amount of space necessary for installation. Space can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a plan view as well.

FIG. 3 is an explanatory diagram when similarly raising the bed frame.

FIG. 4 is an explanatory diagram of the length relationship between the third arm and the fifth arm.

FIG. 5 is a schematic explanatory diagram of a conventional bed device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Base body, 3... First shaft, 4... Second shaft, 5... First arm, 6... Second arm, 7... Connecting member, 8... Drive mechanism, 12... Drive shaft , 13...Third arm, 14...Fourth arm, 17...Roller, 18...Bed frame, 21...Fifth arm.

Claims (1)

[Claims] Claims: 1. A base body in which a first axis and a second axis are parallel and rotatable; a first arm having a middle portion fixed to the first axis; a second arm having one end fixed to the shaft; both ends rotatably connected to one end of the first arm and the other end of the second arm, respectively; a drive mechanism provided on the coupling member, the coupling member having a drive shaft that is driven forward and backward, and the distal end of the drive shaft being rotatably coupled to the other end of the first arm; a third arm and a fourth arm each having one end fixed to the first shaft and the second shaft, and a third arm horizontally disposed above the base body; The other ends of the - arm and the fourth arm are rotatably and horizontally slidably connected, and are driven vertically in conjunction with the rotation of the third and fourth arms. The bed frame is provided with one end pivotally connected to the middle part of at least one of the third arm or the fourth arm, and the other end pivotally connected to the bed frame. A bed device comprising a fifth arm that prevents the bed from sliding in the horizontal direction when being driven in the vertical direction.