JP3524178B2 - Magnetic levitation type anti-vibration bed - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic levitation type anti-vibration bed in which a bed body is levitated by utilizing a magnetic repulsive force.

[0002]

2. Description of the Related Art Conventionally, a vibration-proof bed as shown in FIG. 5 is known. The anti-vibration bed B includes a pair of front and rear support rods R rotatably provided on a floor F around a support shaft, and a bed body B1 pivotally supported by the support shaft at the tip of the support rod R. It is basically composed of Then, the pair of front and rear support rods R and the bed body B1
And the floor F form a parallelogram link structure,
The bed body B1 can move up and down while being restricted by this link structure.

Magnets M having the same poles facing each other are provided on the bottom surface of the bed body B1 and the floor F.
The bed body B1 is magnetically levitated on the floor F in a state where the repulsive force of the magnet M and the weight of the bed body B1 are balanced. Such an anti-vibration bed B is installed in, for example, an ambulance, and a stretcher S carrying a patient is attached to the bed body B1.
When placed on the bed, their weights are also added on the bed body B1, and the bed body B1 is lowered against the repulsive force of the magnet M, and the repulsive force of the magnet M and the added weight are balanced. It becomes a state. In this state, the vibration of the vehicle body is absorbed by the repulsive elastic force of the magnet M and is not directly transmitted to the bed body B1.

The vibration of the running vehicle is absorbed by the repulsive elastic force and is not directly transmitted to the patient lying on the stretcher S, so that the lying state is stable. The magnetic levitation type vibration isolation structure is superior in vibration absorption efficiency to the spring type and has a simple structure. Therefore, many vibration proof structures will be replaced by the magnetic levitation type in the future. There is a situation.

[0005]

By the way, in the conventional anti-vibration bed B as shown in FIG. 5, the support rod R moves up and down with respect to the floor F against the repulsive force of the magnet M. Rotates around the fulcrum on the floor F side,
For example, as indicated by the chain double-dashed line, the tip of the bed body B1 moves in the horizontal direction by a distance d, and this movement applies a horizontal force to the lying person on the stretcher S, so that the lying person moves on the stretcher S. It had a problem of shifting in the front-back direction.

Further, when the bed body B1 moves in the front-back direction, this movement causes a displacement between the opposing surfaces of the upper and lower magnets M, and this displacement reduces the magnetic pole surface that contributes to the repulsive force of the magnet M, which is effective. In addition, there is a problem that the repulsive force of the magnet cannot be used.

Further, if the bed body B1 moves in the front-rear direction, in order to install the anti-vibration bed B, a large amount of installation space corresponding to the amount of movement is required, especially for the vehicle. However, there is a problem in that it cannot be installed in a narrow vehicle compartment space.

The present invention has been made to solve the above-mentioned problems, and the repulsive force of the magnet is always effectively utilized without applying a force in the front-back direction to a lying person on the bed. It is an object of the present invention to provide a magnetic levitation type anti-vibration bed which can be installed in a narrow space such as a vehicle.

[0009]

According to another aspect of the present invention, there is provided a magnetic levitation type anti-vibration bed in which a magnet having pole faces of the same polarity opposed to each other is provided on the back surface of the bed body and on the floor. , A magnetic levitation type anti-vibration bed configured such that the repulsive force of these magnets causes the bed body to float above the floor, and the vertical vibration of the bed body is absorbed by the repulsive force of the magnets. between the floor each pair of link mechanisms in the width direction at front and rear positions of the bed body is interposed, the link mechanism has a front and rear links disposed obliquely between the bed body and the floor and the rod is constituted by the connected front and rear auxiliary rods between these front and rear link rod and the bed body or the floor, the front of the bed body and the floor
And the front contact of the rear auxiliary rod side it is connected
And the end of the rear link rod to the lower edge of the bed body.
The other is characterized in movable der <br/> Rukoto in the longitudinal direction while contacting on the floor.

The magnetic levitation type vibration damping bed according to claim 2 of the present invention is the magnetic levitation type vibration damping bed according to claim 1, wherein the effective length of each auxiliary rod is 1 / the effective length of each link rod. The dimension is set to 2, and the tip end portion of each auxiliary rod is connected to the midpoint portion of the effective length of the link rod.

The magnetic levitation type vibration damping bed according to claim 3 of the present invention is the magnetic levitation type vibration damping bed according to claim 1 or 2, wherein the end of each of the link rods movable in the front-rear direction has a width. Each roller is rotatably supported about a horizontal axis extending in the direction.

[0012]

According to the magnetic levitation type anti-vibration bed of the first aspect, the repulsive force of the magnets provided on the back surface of the bed body and on the floor so that the magnetic pole surfaces having the same polarities face each other The main body is floating on the floor. Further, when the floor vibrates up and down, this vibration is absorbed by the elastic force due to the repulsive force of the magnet, and the bed body is in a state where the vibration is alleviated. Then, the link mechanism interposed between the floor and the bed body, before the front and rear link rod provided therebetween, is provided between the these link rods and the bed body or floor
Side and rear auxiliary rods, the ends of the link rods on either side of the bed body and the auxiliary rods of the floor are connected to each other so that the bed body can move forward and backward. The bed body does not shift in the horizontal direction even if it moves up and down relative to the bed body.

According to the magnetic levitation type vibration isolation bed of the second aspect, since the effective length of the auxiliary rod is set to 1/2 of the effective length of the link rod, the effective length of the auxiliary rod and the link are linked. Two isosceles triangles are formed with half the rod effective length.One isosceles triangle has its base formed in the space between the bed body and the floor, and the other isosceles triangle has a base. Is formed on the bed body or floor, and the ends of the link rods are movable in the horizontal direction on the bed body or floor. Corresponds to the above-mentioned relative movement in the vertical direction, and the bed body does not shift laterally while maintaining a horizontal posture.

According to the magnetic levitation type anti-vibration bed of the third aspect, a roller rotatably supported about a horizontal axis extending in the width direction is provided at the end of the link rod movable in the front-rear direction. Therefore, the rotation of the roller about the horizontal axis smoothly moves the link rod in the lateral direction.

[0015]

EXAMPLE In this example, a magnetic levitation type anti-vibration bed mounted on a vehicle will be described below with reference to the drawings.
The anti-vibration bed according to the present invention is not limited to an on-vehicle bed, but can be applied as a normal bed for a home or a bed.

FIG. 1 is a perspective view showing an example of a magnetic levitation type vibration damping bed according to the present invention, and FIG. 2 is a view taken along the line A thereof. As shown in these drawings, a vibration-proof bed 1 is provided on a floor F of a vehicle in parallel with a lower frame 2 and an upper portion of the lower frame 2 with a predetermined interval. A bed main body 3, a pair of link mechanisms 4 in the vehicle width direction interposed between the bed main body 3 and the lower frame 2, and a magnetic levitation mechanism 5 for levitating the bed main body on the floor F are basically configured. There is.

The lower frame 2 is made of an L-shaped material, and one side portion of the L-shaped material is fixedly adhered to the floor F and the other side portion is erected on the floor F. A pair of front and rear brackets 21 are provided so as to project upward at the upper edge of the state.

The bed body 3 is processed into a rectangular parallelepiped having an opening at the bottom by pressing a metal flat plate.
Side plates 31 are formed on both sides in the vehicle width direction,
A guide recess 32 extending in the vehicle length direction is provided in the upper surface portion, and the guide recess 32 guides the wheel S1 of the stretcher S on the bed body 3 as shown by the chain double-dashed line in FIG. ing. A pair of front-rear brackets 33 are provided on the edge of the side plate 31 so as to face the bracket 21 on the lower frame 2 side and project downward.

The link mechanism 4 includes a front link arm 41 that is forwardly advanced and is inserted between the front bracket 21 of the lower frame 2 and the front bracket 33 of the bed body side plate 31, and the front link arm. A front auxiliary link arm (front auxiliary link rod) 42 bridged between the central portion of the arm (front link rod) 41 and the side plate 31;
A rear link arm (rear link rod) 43, which extends forward from the rear of the lower frame 2 and between the brackets 33 on the rear side of the bed main body side plate 31, a central portion of the rear link arm 43, and the side plate 31. The rear auxiliary link arm (rear auxiliary link rod) 44 is bridged between the two.

The lower end of the front link arm 41 is rotatably supported around a shaft 41a provided on the front bracket 21 of the lower frame 2.
A front roller 41c rotatably supported around a shaft 41b is provided at the upper end portion, and an outer peripheral surface of the front roller 41c is in contact with a lower edge portion of the side plate 31. The lower end of the rear link arm 43 is rotatably supported around a shaft 43a provided on the rear bracket 21 of the lower frame 2, and the upper end thereof is rotatable around a shaft 43b. The rear roller 43c is pivotally supported on the
The outer peripheral surface of the rear roller 43c is in contact with the lower edge of the side plate 31.

The upper end portion of the front auxiliary link arm 42 is the front bracket 33 of the side plate 31 of the bed body 3.
Is rotatably supported around a shaft 42a provided on the front link arm 4 by a shaft 42b.
1 and is connected to the front auxiliary link arm 42 and the front link arm 4
1 is relatively rotatable about the shaft 42b. Further, the rear auxiliary link arm 44 has its upper end rotatably supported around a shaft 44a provided on the rear bracket 33 of the side plate 31 of the bed body 3, and the lower end thereof is supported by the shaft 44b. Coupled to the rear link arm 43, the rear auxiliary link arm 44 and the rear link arm 43 are relatively rotatable around the shaft 44b.

In the present invention, the effective length of the front link arm 41, that is, the distance between the shaft center of the shaft 41a and the shaft center of the shaft 41b is equally divided into two parts, and the shaft 42b is formed at the midpoint portion.
Is dimensioned so that the axis of
The effective length of the front auxiliary link arm 42 is set to ½ of the effective length of the front link arm 41. Therefore, the shaft 41
a distance between the shaft center of a and the shaft center of the shaft 42b, distance between the shaft center of the shaft 42b and the shaft center of the shaft 41b, and distance between the shaft center of the shaft 42b and the shaft center of the shaft 42a. Are all the same distance m
It has become.

Further, the effective length of the rear link arm 43 is set to be the same as the effective length of the front link arm 41, and the axial support states thereof are also the axial support states of the front link arm 41 and the front auxiliary link arm 42. Is symmetrically set and is set similarly.

On the other hand, the magnetic levitation mechanism 5 includes an upper magnet housing box 52 provided on the back surface of the bed body 3 and a lower magnet housing box 51 provided between the pair of lower frames 2.
The upper permanent magnet 52a is housed and fixed in the upper magnet housing box 52, and the lower permanent magnet 51a is housed and fixed in the lower magnet housing box 51. The upper magnet housing box 52 has an opening on the lower surface,
The lower magnet housing box 51 has openings on the upper surface, and the openings are positioned so as to face each other.
Further, the lower permanent magnet 51a and the upper permanent magnet 52a housed in the magnet housing boxes 51, 52 have the same poles facing each other, and the bed body 3 floats above the floor F by their repulsive force. It has become.

The operation of the present invention will be described below with reference to FIG. FIG. 3 is an explanatory diagram for explaining the operation of the magnetic levitation bed shown in FIG. 1. (a) shows a state in which no load is applied on the bed body, and (b) shows a person lying on the bed body. The lying stretcher is placed, and (c) shows the bed body tilted.

First, when the stretcher S carrying a recumbent is not placed on the bed body 3, as shown in FIG. 3B, the bed body 3 has a weight and a magnetic levitation mechanism 5. The magnets 51a and 52a facing each other are floated on the lower frame 2 via the link mechanism 4 in a state of balance with the repulsive forces.

Next, when the stretcher S on which the lying person is placed is placed on the bed body 3, this time, as shown in FIG. 3B, the bed body 3 has the weight of the lying person and the stretcher. Since the weight of S and the weight of S are added, the bed body 3 is lowered by the amount of the increase in weight against the repulsive force of the magnets 51a and 52a. When the bed main body 3 descends, the lower edge of the side plate 31 of the bed main body 3 presses the front roller 41c and the rear roller 43c downward.
1 rotates clockwise around the shaft 41a, and the rear link arm 43 rotates counterclockwise around the shaft 43a.

The shaft 4 of each link arm 41, 43
The rollers 41c and 43 are rotated by the rotation around 1a and 43a.
c move in a direction in which they approach each other while being in contact with the lower edge of the side plate 31 of the bed body 3. At this time, the front auxiliary link arm 42 and the rear auxiliary link arm 4 connected to the midpoint portion of the effective length of the front link arm 41 and the rear link arm 43.
Since the horizontal movement of the bed main body 3 is restricted by 4, the bed main body 3 does not move in the horizontal direction but descends to a height balanced with the repulsive force of the magnetic force.

In the state shown in FIG. 3B, the vertical vibration of the vehicle is transmitted to the bed main body 3 via the floor F, the lower frame 2 and the link mechanism 4, but the bed main body 3 has inertia. By the vertical movement of the lower frame 2 while maintaining the present position, the front link arm 41 and the rear link arm 43 rotate in opposite directions about the shaft 41a and the shaft 43a, and accordingly, the front roller 41c.
The rear roller 43c and the rear roller 43c roll around the shafts 41b and 43b while being in contact with the lower edge of the side plate 31, respectively, and the vibration of the vehicle in the vertical direction is absorbed.

Since the front link arm 41 and the rear link arm 43 are connected to the side plate 31 of the bed body 3 via the front auxiliary link arm 42 and the rear auxiliary link arm 44, respectively, even if the bed body 3 is on the floor F. Even if the bed body 3 vibrates relative to the vertical direction, the bed body 3 is restricted by the auxiliary link arms 62 and 64 and does not move in the horizontal direction.

Next, when the stretcher S is put on and off the bed body 3, as shown in FIG. 3C, a stretcher with a recumbent placed on the rear portion of the bed body 3 (on the right side of the figure). Since the weight of S is biasedly applied, the biased weight load causes the bed body 3 to tilt downward to the right. Then, due to this inclination, the bed body 3 of the stretcher S is
It is easy to get on and off the vehicle.

FIG. 4 is a side view showing another example of the magnetic levitation type vibration damping bed. In the case of the vibration-proof bed 10 of this example, only one set of link mechanisms 4 in the vehicle width direction is provided between the vehicle longitudinal direction central portion of the lower frame 20 and the vehicle body longitudinal direction central portion of the bed body 30.
0 is provided, and the magnetic levitation mechanism 50 is provided in all of the anti-vibration bed 10 and at two positions in the rear portion, which is a great difference from the anti-vibration bed 1 of the previous example.

Specifically, a bracket 210 is provided at the center of the lower frame 20 in the vehicle length direction so as to project upward.
A link arm 410 is rotatably supported around a shaft 410a of the bracket 210. On the other hand, the side plate 310 of the bed main body 30 is formed with a long hole 340 extending in the lateral direction on the right side of the central portion, and the column-shaped protrusion 410b provided on the upper end of the link arm 410 is formed in the long hole 340. The protrusion 410b is slidably inserted into the elongated hole 340.

On the other hand, on the side plate 310 of the bed body 30,
A bracket 330 is projectingly provided at a central portion in the vehicle length direction so as to face the bracket 210 of the lower frame 20, and an auxiliary link arm 420 is rotatably supported around a shaft 420a of the bracket 330. . The effective length of the auxiliary link arm 420 is 1 of the effective length of the link arm 410.
The length is set to / 2, and the lower end of the link arm 410 is rotatably supported around the midpoint of the effective length of the link arm 410 about the shaft 420b.

A pair of lower permanent magnets 51 is provided between the pair of lower frames 20 in the vehicle width direction and on both sides in the vehicle length direction.
a is provided and a pair of side plates 31 in the vehicle width direction
A pair of upper permanent magnets 52a corresponding to the pair of lower permanent magnets 51a in the vehicle length direction are provided between 0. The surfaces of the lower permanent magnet 51a and the upper permanent magnet 52a are set so that the pole faces of the same pole face each other.

Therefore, the repulsive force of the lower permanent magnets 51a and the upper permanent magnets 52a provided on both sides in the vehicle length direction of the anti-vibration bed 10 causes the bed body 30 to move to the floor F.
The link mechanism 40 interposed between the bed main body 30 and the lower frame 20 restrains the horizontal movement of the bed main body 30 and stabilizes the floating state. The operations of the magnetic levitation mechanism 50 and the link mechanism 40 of the vibration isolation bed 10 of this example are the same as those of the vibration isolation bed 1 of the previous example.

As described above, in the vibration-proof bed 10 of this embodiment, the link mechanism 40 is formed as one set in the vehicle length direction, and the upper end of the link arm 410 is provided with the protrusion 410b instead of the roller. Therefore, the number of parts can be reduced correspondingly, which is convenient for reducing the manufacturing cost.

In the above embodiment, the link arms 41,
The rollers 41c, 43c or the protrusions 410b are provided on the upper ends of the link arms 41, 43, 4 and
An auxiliary link arm 42 is provided between the bed 10 and the bed body 3, 30.
However, the present invention is not limited to the link mechanisms 4 and 40 configured as described above, and the link arms are connected to the side plate 31 of the bed body 3.
Is rotatably supported about a horizontal axis, and a roller is rotatably supported on the lower end of the link arm about a horizontal axis extending in the vehicle width direction. The roller is supported on the upper edge of the lower frame 2. The auxiliary link arm having an effective length that is half the length of the link arm may be provided between the central portion of the link arm and the lower frame 2.

[0039]

According to the magnetic levitation type anti-vibration bed of the first aspect of the present invention, the repulsion of the magnets provided on the back surface of the bed body and on the floor so that the magnetic pole surfaces having the same polarities face each other. Due to the force, the bed itself is floating above the floor. Further, when the floor vibrates up and down, this vibration is absorbed by the elastic force due to the repulsive force of the magnet, and the bed body is in a state where the vibration is alleviated. Then, the link mechanism interposed between the floor and the bed body has a front and rear link rod provided therebetween, is provided between the these link rods and bed body or floor forward And the rear auxiliary rod, and the end of each link rod on either side of the bed body and the auxiliary rod in the floor is connected to the bed main body because the end of each link rod is movable in the front-back direction. The bed body will not be displaced in the horizontal direction even if it moves up and down relative to.

As described above, the magnetic levitation type anti-vibration bed according to claim 1 of the present invention does not move laterally like the conventional one even if the bed body vibrates vertically with respect to the floor. , Comfortable lying is realized without applying a force in the front-back direction to a lying person on the bed body. Further, since there is no change in the area of the facing surfaces of the upper and lower magnets, the repulsive force of the magnets can always be effectively utilized. Further, since the bed body does not shift back and forth, it is possible and convenient to install the anti-vibration bed in a narrow space such as in a vehicle.

According to the magnetic levitation type anti-vibration bed of the second aspect, the effective length of each auxiliary rod is set to 1/2 of the effective length of the link rod. Two isosceles triangles are formed with half the effective length of the link rod, and one isosceles triangle has its base formed in the space between the bed body and the floor, and another isosceles triangle. Since the bottom side is formed on the bed body or floor, and the end of the link rod is movable in the bed body or floor in the horizontal direction, when the bed body moves vertically relative to the floor, The bottom side expands and contracts to correspond to the relative movement in the vertical direction, and the bed body does not shift laterally while maintaining a horizontal posture.

According to the magnetic levitation type anti-vibration bed of the third aspect of the present invention, the roller rotatably supported around the horizontal axis extending in the width direction is provided at the end of the link rod movable in the front-rear direction. Since the roller is provided, the lateral movement of the link rod is smoothly performed by the rotation of the roller about the horizontal axis.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a magnetic levitation type vibration damping bed according to the present invention.

FIG. 2 is a view on arrow A in FIG.

3A and 3B are explanatory views for explaining the operation of the magnetic levitation bed shown in FIG. 1, where (A) is a state in which no load is applied on the bed body, and (B) is a lying person on the bed body. The lying stretcher is placed, and (c) shows the bed body tilted.

FIG. 4 is a side view showing another example of the magnetic levitation bed according to the present invention.

FIG. 5 is an explanatory side view illustrating a conventional magnetic levitation bed.

[Explanation of symbols]

1,10 Anti-vibration bed 2,20 Lower frame 21,210 Bracket 3,30 Bed body 31,310 Side plate 32 Guide recess 33 Bracket 4,40 Link mechanism 41 Front link arm (front link rod) 41a, 41b Shaft 42 Front auxiliary Link arms 42a, 42b Shaft 43 Rear link arm (rear
Link rod) 43a, 43b Axis 44 Rear auxiliary link arm 44a, 44b Axis 410 Link arm 420 Auxiliary link arm 5,50 Magnetic levitation mechanism 51 Lower magnet housing box 51a Lower permanent magnet 52 Upper magnet housing box 52a Upper permanent magnet F Floor S Stretcher

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47C 17/00-25/02 A47C 29/00 A61G 3/00 A61G 7/08

Claims (3)

(57) [Claims] 1. A back surface of a bed main body and a floor are provided with magnets whose magnetic pole surfaces having the same poles face each other, and the repulsive force of these magnets causes the bed main body to float above the floor.
A magnetic levitation type anti-vibration bed configured such that the vertical vibration of the bed body is absorbed by the repulsive force of the magnet, and a front side of the bed body is provided between the bed body and the floor.
And each pair of link mechanisms at a rearward position in the width direction is interposed, the link mechanism has a front and rear link rod provided obliquely between the bed body and the floor, these
It is composed of a connected front and rear auxiliary rods between the front and rear link rod and the bed body or the floor, bed body and front and rear <br/> auxiliary rod side it is connected of the floor the front and the end of the rear Li <br/> Nkuroddo under the bed body edge or floor of the
Magnetically levitated vibration damping bed, wherein movable der Rukoto in the longitudinal direction in contact with the above. With wherein the effective length of the respective auxiliary rod is dimensioned to 1/2 of the effective length of the respective phosphorus <br/> Kuroddo, in the tip effective length of the link rod of the auxiliary rod The magnetic levitation type anti-vibration bed according to claim 1, wherein the magnetic levitation type anti-vibration bed is connected to point portions. 3. A process according to claim 1, characterized in that the front and rear at the end of each link rod movable in a direction which is rotatably journalled about a horizontal axis extending in the width direction roller are respectively provided Alternatively, the magnetic levitation type anti-vibration bed described in 2.