JPH0337417B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rocking bed, and particularly to a rocking bed suitable for use as a hospital bed.

[Conventional technology]

Traditionally, we have treated critically ill patients, patients with long-term limited movement (paralytic patients, people with head injuries, people with multiple sclerosis, people with broken spines, and patients who are unable to make voluntary movements or who are involuntary). Severely injured patients who need to be restrained from moving, including convulsive movements, can be left immobile in hospital beds, resulting in a variety of complications (descending pneumonia, atelectasis, thrombophlebitis, pulmonary embolism,
Preventing complications that are known to cause urinary stones, urinary tract infections, pressure ulcers, osteoporosis, muscle wasting, ectopic bone formation, constipation and fecal impaction, and orthostatic hypotension. To address this issue, a swinging hospital bed has been proposed.

As a swinging hospital bed like this,
There is one described in Publication No. 6279, and this conventional rocking hospital bed has a U-shaped bed with a pedestal with pillars erected at both ends, and a stretcher part pivotably supported by both pillars. The keel member and this U with stretcher part
It is composed of a swinging mechanism for swinging the letter-shaped keel member.

[Problem that the invention seeks to solve]

In such a conventional swinging bed, in order to minimize the output of the drive device in the swinging mechanism, the distance between the swinging part of the U-shaped keel with a stretcher, the patient's center of gravity, and the center of rotation is made small. However, if the patient's weight is heavier than the reference weight, the center of gravity will move upward, so a weight commensurate with the amount of movement of the center of gravity is placed on the horizontal part of the U-shaped keel. , balancing.

However, in such a conventional rocking bed, the center of gravity adjustment means simply places a weight on the horizontal part of the U-shaped keel member, so there is a problem that fine adjustment of the center of gravity is difficult. , removal of the weight is complicated.

The present invention aims to solve these problems, and aims to provide a rocking bed that has a simple structure but allows fine adjustment of the center of gravity to be performed easily and quickly. purpose.

[Means for solving problems]

For this reason, the rocking bed of the present invention includes a frame having pillars erected at both ends thereof, a stretcher part pivotably supported by the pillars in a swingable manner, and a bed protruding from and fixed to the stretcher part. A bearing interposed between a support shaft and the support column, and a swinging mechanism for swinging the stretcher section via the support shaft, according to changes in the weight, etc. of a patient lying on the stretcher section. A center of gravity adjustment mechanism for adjusting changes in the center of gravity of the rocking body is provided, and the center of gravity adjustment mechanism has a male threaded rod hanging down from the lower portions of both left and right sides of the stretcher portion, and a female threaded portion screwed into the male threaded rod. A pair of weights screwed to each male threaded rod on both sides of the stretcher section are rotated at the same time at the same speed to adjust the weights up and down in conjunction with each other. The weight interlocking device is composed of
It is characterized by comprising pulleys respectively attached to the pair of weights, and a wire or chain suspended from the same pair of pulleys.

[Effect]

In the above-mentioned rocking bed of the present invention, the center of gravity can be adjusted by simultaneously raising and lowering a pair of weights that are attached to the bottom of the left and right sides of the stretcher so that they can be raised and lowered. It can be done quickly and accurately without causing any damage.

Further, since the vertical adjustment of each weight is performed by rotating each weight with respect to the threaded rod, fine adjustment is possible.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 to 5 show a rocking bed as a first embodiment of the present invention. Figure 1 is a front view thereof, and Figure 2 is its front view. 3 is a side view of the main part, FIG. 4 is a schematic diagram showing the hydraulic swing mechanism, FIG. 5 is a flowchart for explaining its operation, and FIGS. 6 and 7 are This shows a rocking bed as a second embodiment of the present invention, and FIG. 6 is a schematic diagram showing its hydraulic rocking mechanism, and FIG. 7 is a flowchart for explaining its operation. FIG. 8 is a side view of essential parts showing a swing type bed as a third embodiment of the present invention.

As shown in FIGS. 1 to 3, the swinging bed of this embodiment includes a movable pedestal 1, a stretcher section 2 with a fence,
A support shaft 3 attached to this stretcher section 2 with a fence,
Bearing 4 for supporting the support shaft 3 on the movable frame 1
, a hydraulic swing mechanism 5 for swinging the fenced stretcher section 2, and a center of gravity adjustment mechanism 6 capable of adjusting the center of gravity of the entire rocking body including the fenced stretcher section 2 and the patient. .

This movable frame 1 includes a lower frame 10, casters 11 attached to the lower frame 10, and supports 12, 12 erected at both ends of the lower frame 10 in the middle part.
It is composed of.

The stretcher section 2 with a fence has the supports 12 of the movable frame 1.
The H-shaped aggregate 13 is pivotally supported in a swingable manner.
A floor plate member 14 attached to the type aggregate 13, a pine 15 placed on the floor plate member 14, a pair of left and right fence members 16 slidably disposed in the dovetail grooves 13c of the H type aggregate 13, 16, and a support portion 18 that is attached to the fence member 16 and can support a cushion (pad member) 17.

Furthermore, as shown in Figures 3 and 4, H-type aggregate 1
The stretcher section 2 with fences is mounted between the support shafts 3, 3 and the columns 12, 12 fixed to the vertical members 13a, 13a of 3, respectively, and can pivotally support the support shafts 3, 3. The stretcher section 2 with rails is pivotally supported on a movable pedestal 1, and is attached to the movable pedestal 1 so as to be swingable by a hydraulic swing mechanism 5. a drive device (balanced rotary actuator) 19 for swinging the fenced stretcher section 2 through one of the shafts 3, 3; a working fluid supply system 20 for supplying working fluid to the drive device 19; A swing control system 21 for controlling this working fluid supply system 20 is provided.

The drive device 19, as shown in FIG.
A casing 24 which is formed with a pair of fan-shaped fluid pressure chambers 23, 23 for driving the blade 22 to rotate within a required angle range of ± (approximately 120° in this case). It is composed of the following.

Further, the working fluid supply system 20 includes a drive device 19 in the hydraulic swing mechanism 5, as shown in FIG.
The working fluid supply system 20 includes a working fluid pump 27, a working fluid supply pipe 28a connecting the working fluid pump 27 and the drive device 19, 28b
The working fluid pump 27 drives a fluid pressure cylinder 25 made of a non-magnetic material, a free piston 26 made of a magnetic material fitted in the fluid pressure cylinder 25, and a free piston 26 made of a magnetic material. It is composed of electromagnetic coils 27a and 27b attached to both ends 25a and 25b of the fluid pressure cylinder 25, respectively.

The working fluid supply pipes 28a and 28b are connected to both wall surfaces 25c and 25d of the fluid pressure cylinder 25 and to both ends 23 of the fan-shaped fluid pressure chambers 23 and 23 of the drive device 19.
a, 23b, respectively, a variable orifice 29 is inserted in the working fluid supply pipe 28a, and an oil cooler 30 as a working body cooler is inserted in the working fluid supply pipe 28b. There is.

These variable orifice 29 and oil cooler 30 constitute a working fluid supply system 20, and the total amount of oil discharged from the free piston 26 in this working fluid supply system 20 is determined by the sector-shaped fluid pressure chamber 23,
It is set larger than the total volume of 23.

Furthermore, the swing control system 21 includes an electromagnetic coil 27
A control device 31 that alternately switches the supply of power to the electromagnetic coils 27a and 27b at required intervals (for example, 2 minutes) and outputs control signals to the electromagnetic coils 27a and 27b and the variable orifice 29, respectively; A power switch 32 sends an operating signal for the hydraulic swing mechanism 5 to the control device 31, a manual switch 33 serves as a setting device that sends a swing cycle setting signal and a swing angle setting signal to the control device 31, and A rotary position sensor 34 detects the rotation angle of the blade 22, and each wall surface 23 of the fan-shaped fluid pressure chambers 23, 23 has a rotary position sensor 34 and a rotary position sensor 34 that detects the rotation angle of the blade 22.
The limit switches 35a and 35b detect contact with the switches 35a and 23d, and a clock 36 outputs a clock signal to the control device 31.

The control device 31 includes a computer equipped with a memory and a CPU, and receives the swing angle setting signal from the manual switch 33 and the actual angle signal from the rotary position sensor 34 so that the difference is zero. a first control unit 3 that outputs a first switching signal when detecting that the
1a, a second control section 31b that receives detection signals from limit switches 35a and 35b and outputs a second switching signal, and first and second control sections 31
a swing angle mode switching control section 31c that receives a switching signal from at least one of the electromagnetic coils 27a and 31b and sends a switching control signal for switching power supply to the electromagnetic coils 27a and 27b; An oscillation period control section 31d receives a switching control signal from 31c, a clock signal from clock 36, and an oscillation period setting signal from manual switch 33, and sends an orifice amount control signal to variable orifice 29.
It is composed of the following.

Furthermore, as shown in FIG.
two pairs of male threaded rods 42 protruding downward from 4a;
A cylindrical weight 43 having a female threaded part 43a in its central hole that is screwed into the male threaded part 42a formed on the outer periphery of each of these male threaded rods 42, and cylindrical weights 43, 43 disposed on both sides. It is composed of a weight interlocking device 44 for adjusting the vertical movement in conjunction with each other.

The weight interlocking device 44 is attached to each weight 43 and includes a pulley 44a and a pair of left and right pulleys 4.
4a, 44a and a wire or chain 44b. Further, a wire or chain may be provided for interlocking the front and rear pulleys 44a, 44a.

In addition, the code 13b in the figure indicates the horizontal member of the H-shaped aggregate 13, and 45 indicates the floor.
*2, *3, and *4 indicate that they are in communication or connection with each other, and in Figures 1 to 3, the working fluid supply pipes 28a, 2
8b is omitted from illustration.

Since the swingable bed according to the first embodiment of the present invention is constructed as described above, first, a locking mechanism for preventing swinging (not shown) is used to secure the stretcher portion with rails to the bed.
After fixing the patient in a horizontal position and placing the seriously ill patient on his back on the mat 15, cushions (pad members) 17, 17 are placed so as to hold the patient's chest.
It is inserted between the patient's chest and the support part 18.

At this time, the cushion (pad member) 17,1
The end portion of 7 is fixed to the support portion 18 with a fastener (magic tape) or the like.

Then, using a band (not shown) or the like, the patient is
Secure it to the stretcher section 2 with a fence.

In this state where the patient is tied to the stretcher section 2 with rails, the center of gravity is adjusted by using the center of gravity adjustment mechanism 6.

First, depending on the patient's physique and weight, the weight is moved to a position approximately commensurate with the patient's weight in order to prevent the center of gravity of the entire swinging member from moving upward or downward from the standard center of gravity for a patient of normal weight. 43 up and down.

At this time, when the weight 43 on one side is rotated and moved up and down, the weight 43 on the other side is also moved up and down via the weight interlocking device 44.

In this way, by bringing the center of gravity of the whole swinging closer to or aligning with the swing center, the driving force of the drive device 19 and the working fluid supply system 20,
Pump capacity can be reduced.

Then, when the power switch 32 is turned on with the center of gravity adjusted in this way,
As shown in FIG. 5, first, in block A1, the rotation direction flag F is set to zero (counterclockwise as shown in FIG. 4) for initialization (step a1), and then the manual switch 33 is set to zero (counterclockwise as shown in FIG. 4).
[Here, the _{swing angle setting value 0 is set} to the maximum swing angle. ] and read the current time T from the clock 36 (step a2), and set the current time T to the value Tn stored in the first memory (step a2).
a3).

Then, the rotation direction flag F is determined (step a4), and if F=0 (counterclockwise), the electromagnetic coil 27a is turned on in order to perform counterclockwise rocking in block A2, and further The electromagnetic coil 27b is turned off, and the drive device 19
The blades 22 of the blades 22 are rotated in the forward direction (step a).
5).

Further, the actual rotation angle θ of the blade 22 is read from the rotary position sensor 34 (step a6),
Is the actual rotation angle θ greater than or equal to the target rotation angle ₀ (step a7) or is the limit switch 35a
until it turns on (step a8).
The blade 22 is rotated in the forward rotation direction.

Then, in steps a7 and a8, θ≧
₀ or the ON state of the limit switch 35a is detected, the rotation direction flag F is set to 1 (clockwise as shown in FIG. 4) (step a9).

Also, the rotation direction flag F is determined (step a4), and if F=1 (clockwise), block A
3, in order to perform clockwise rocking, the electromagnetic coil 27b is turned on, and the electromagnetic coil 27a is turned off, and the blade 2 of the drive device 19 is turned on.
2 in the reverse direction (step a10).

Further, the actual rotation angle θ of the blade 22 is read from the rotary position sensor 34 (step a1).
1) The blade 22 is rotated in the normal rotation direction until the actual rotation angle θ becomes less than or equal to the target rotation angle _-0 (step a12) or the limit switch 35b is turned on (step a13).

Then, in steps a12 and a13, θ
≦ _-0 or when the ON state of the limit switch 35b is detected, the rotation direction flag F is set to 0 (the fourth
counterclockwise as shown in the figure) (step a1).
4).

In this way, after counterclockwise and clockwise rotations are performed in blocks A2 and A3, the target rotation angle is ₀ (here,
In order to temporarily stop the swing at the maximum deflection angle position,
Currently excited electromagnetic coil 27a (27b)
is maintained in the on state, and the blades 22 of the drive device 19 are stopped (step a15).

Next, in block A5, in order to adjust the swing period, the current time T is read from the clock 36 (step a16), and the current time memory value Tn is set to 1.
The current time T is stored as the previous stop time T _o-1 and the current stop time Tn (step a1).
7).

Then, the difference (Tn-T _o-1 ) between the current stop time Tn and the previous stop time T _o-1 is taken (step a18), and the actual period Tw [=2 (Tn −
T _o-1 )] and the target period T ₀ (step a1
9) If the difference (Tw - T ₀ ) is less than the predetermined value (-ε), reduce the opening degree of the variable orifice 29 by a predetermined amount (step a20), so that the actual cycle Tw becomes the target cycle T ₀ . Decrease and adjust the rocking speed.

Further, if the difference (Tw - T ₀ ) is larger than the predetermined value ε, the opening degree of the variable orifice 29 is increased by a predetermined amount (step a21), so that the actual period Tw becomes the target period T ₀
Adjust the oscillation speed to increase the speed so that the difference (Tw
-T ₀ ) is within the predetermined value ε, the opening degree of the variable orifice 29 is not adjusted.

After adjusting the opening degree of the variable orifice 29 in steps a19 to a21, the process returns and in the next process flow, the processes of blocks A2 to A5 described above are executed again.

At this time, if block A2 was processed in the previous processing flow, step a9
Since the rotation direction flag F is changed from zero to 1 in the next process flow, the process of block A3 is performed, that is, the process flow is performed in the order of blocks "A2 → A4 → A5". , Block "A3 → A4 → A5"
The processing flows performed in this order are executed alternately.

Thereby, the patient can be swung at a predetermined period T ₀ and a predetermined swing angle ₀ while the patient is fixed to the stretcher section 2 with rails. This swinging state of the fenced stretcher section 2 is shown by the two-dot chain line in FIG.

Furthermore, the working fluid pump 27 in the working fluid supply system 20 is arranged below and apart from the fenced stretcher section 2, and furthermore, it is constituted by a cylinder type pump equipped with a free piston 26 made of magnetic material. The operating noise is extremely low and is difficult to transmit, making it suitable for use in caring for critically ill patients.

In addition, the fence member 16 is a vertical member 13a of the H-shaped aggregate 13, as shown by the two-dot chain line in the right half of FIG.
The patient can move up and down along the dovetail groove 13c, thereby making it easier to move the patient to the bed.

A rocking bed as a second embodiment of the present invention is as follows:
As shown in FIGS. 6 and 7, the working fluid supply system 20'
and a swing control system 21' are different from the first embodiment, and in FIGS. 6 and 7, the same reference numerals as in the first embodiment shown in FIGS. 1 to 5 indicate substantially the same components.

This working fluid supply system 20' includes an oil tank 3
7, an electric motor 38, a working fluid pump 39 that receives rotational driving force from the electric motor 38 and pumps out working oil from the oil tank 37, a discharge port 39a of the oil tank 37 and the pump 39, and a fan-shaped fluid pressure Working fluid supply pipes 28a, 28 connected to both ends 23a, 23b of the chambers 23, 23, respectively
a', 28b, 28b', and a three-way switching valve 40 inserted into these working fluid supply pipes 28a, 28a', 28b, 28b'.

The three-way switching valve 40 is in a forward rotation communication state A, a reverse communication communication state B, and a stop cutoff state C.
It is configured so that it can take on three states,
In the forward rotation communication state A achieved by the electromagnetic coil 40a being energized and the electromagnetic coil 40b being de-energized, oil discharged from the pump 39 passes from the working fluid supply pipe 28a' to the working fluid supply pipe 28a to the fan-shaped fluid pressure chamber. The oil discharged from the end 23a of the fan-shaped fluid pressure chamber 23 is connected to the oil tank 3 through the working fluid supply pipe 28b and the working fluid supply pipe 28b'.
7.

Moreover, the three-way switching valve 40 has its electromagnetic coil 40
In the reverse communication state B achieved by the energized state of b and the de-energized state of the electromagnetic coil 40a, oil discharged from the pump 39 passes from the working fluid supply pipe 28a' to the working fluid supply pipe 28b to the fan-shaped fluid pressure chamber 2.
The oil discharged from the end 23b of the fan-shaped fluid pressure chamber 23 is connected to the working fluid supply pipe 28a from the working fluid supply pipe 28a.
It is connected to be supplied to the oil tank 37 through 8b'.

Furthermore, the three-way switching valve 40 includes an electromagnetic coil 40
The pump 39, the oil tank 37, and the sector-shaped fluid pressure chambers 23, 23 are configured to be in a cut-off state in a stop cut-off state C achieved by a return spring (not shown) when the pumps a and 40b are in a non-energized state.

A pump 3 is connected to the working fluid supply pipe 28a'.
A pressure valve 41 is inserted, which is in a communicating state when the discharge pressure from the valve 9 exceeds a predetermined pressure, and is in a closed state otherwise.

Further, the swing control system 21' includes a three-way switching valve 40
a control device 31 that alternately switches the supply of power to the electromagnetic coils 40a, 40b every required time (for example, 2 minutes) and outputs control signals to the electromagnetic coils 40a, 40b and the variable orifice 29, respectively; A power switch 32 that sends an activation signal for the hydraulic swing mechanism 5 to the control device 31, and a manual switch 33 as a setting device that sends a swing period setting signal and a swing angle setting signal to the control device 31.
, a rotary position sensor 34 that detects the rotation angle of the support shaft 3 or the rotation angle of the blade 22;
Both ends 23a, 2 of fan-shaped fluid pressure chambers 23, 23
3b and a clock 36 that outputs a clock signal to the control device 31.

Since the rocking bed according to the second embodiment of the present invention is constructed as described above, after the patient has been secured and the center of gravity has been adjusted in the same manner as in the first embodiment, the power switch 32 is turned on. Then, as shown in FIG. 7, first, in block B1, the rotation direction flag F is set to zero (counterclockwise as shown in FIG. 6) for initialization (step b1), and then the manual switch 33 is set to zero (counterclockwise as shown in FIG. 6).
From the swing cycle set value (target cycle) T ₀ and the swing angle set value (target rotation angle) ₀ [Here, the swing angle set value ₀ is set to the maximum swing angle. ] and the current time T from the clock 36 (step b2), and the current time T is set to the value Tn stored in the first memory (step b3).

Then, the rotation direction flag F is determined (step b4), and if F=0 (counterclockwise), the electromagnetic coil 40a is turned on in order to perform counterclockwise rocking in block B2, and further With the electromagnetic coil 40b turned off, the three-way switching valve 4
0 to the forward rotation energization state A, and the blades 22 of the drive device 19 are rotated in the forward rotation direction (step b5).

Further, the actual rotation angle θ of the blade 22 is read from the rotary position sensor 34 (step b6),
Is the actual rotation angle θ greater than or equal to the target rotation angle ₀ (step b7) or is the limit switch 35a
until it turns on (step b8).
The blade 22 is rotated in the normal rotation direction.

Then, in steps b7 and b8, θ≧
₀ or the ON state of the limit switch 35a is detected, the rotation direction flag F is set to 1 (clockwise as shown in FIG. 6) (step b9).

Also, the rotation direction flag F is determined (step a4), and if F=1 (clockwise), block B
3, in order to perform clockwise rocking, the electromagnetic coil 40b is turned on, the electromagnetic coil 40a is turned off, the three-way switching valve 40 is placed in the reverse energization state B, and the blade 22 of the drive device 19 is rotated in the reverse direction. direction (step b10).

Further, the actual rotation angle θ of the blade 22 is read from the rotary position sensor 34 (step b1
1) The blade 22 is rotated in the normal rotation direction until the actual rotation angle θ becomes less than or equal to the target rotation angle _-0 (step b12) or the limit switch 35b is turned on (step b13).

Then, in steps b12 and b13, θ
≦ _-0 or when the ON state of the limit switch 35b is detected, the rotation direction flag F is set to 0 (sixth
counterclockwise as shown in the figure) (step b1).
4).

In this way, after counterclockwise and clockwise rotations are performed in blocks B2 and B3, the target rotation angle is ₀ (here,
In order to temporarily stop the swing at the maximum deflection angle position,
The currently excited electromagnetic coils 40a and 40b are both turned off, the three-way switching valve 40 is placed in the stop cut-off state C, and the blades 22 of the drive device 19 are stopped (step b15).

Next, in block B5, in order to adjust the swing period, the current time T is read from the clock 36 (step b16), and the current time memory value Tn is set to 1.
The current time T is stored as the previous stop time T _o-1 and the current stop time Tn (step b1
7).

Then, the difference (Tn-T _o-1 ) between the current stop time Tn and the previous stop time T _o-1 is calculated (step b).
18), the real period Tw [=2(Tn−
T _o-1 )] and the target period T ₀ (step b1
9) If the difference (Tw - T ₀ ) is less than the predetermined value (-ε), reduce the opening degree of the variable orifice 29 by a predetermined amount (step b20), so that the actual period Tw becomes the target period T ₀ . Decrease and adjust the rocking speed.

Further, if the difference (Tw - T ₀ ) is larger than the predetermined value ε, the opening degree of the variable orifice 29 is increased by a predetermined amount (step b21), so that the actual period Tw becomes the target period T ₀
Adjust the oscillation speed to increase the speed so that the difference (Tw
-T ₀ ) is within the predetermined value ε, the opening degree of the variable orifice 29 is not adjusted.

After adjusting the opening degree of the variable orifice 29 in steps b19 to b21, the process returns and in the next processing flow, the processes of blocks B2 to B5 described above are executed again.

At this time, if block B2 was processed in the previous processing flow, step b9
Since the rotation direction flag F is changed from zero to 1 in the next process flow, the process of block B3 is performed, that is, the process flow is performed in the order of blocks "B2 → B4 → B5". , Block "B3 → B4 → B5"
The processing flows performed in this order are executed alternately.

Thereby, the patient can be swung at a predetermined period T ₀ and a predetermined swing angle ₀ while the patient is fixed to the stretcher section 2 with rails. This swinging state of the fenced stretcher section 2 is shown by the two-dot chain line in FIG.

Furthermore, since the working fluid pump 39 in the working fluid supply system 20' is located below and away from the fenced stretcher section 2, the operating noise is extremely low.
Moreover, it is difficult to convey, making it suitable for use in nursing seriously ill patients.

Note that the pilot oil pressure of the working fluid pump 39 or the rotation of the electric motor 38 may be adjusted without providing the variable orifice 29.

Further, in the rocking bed according to the third embodiment of the present invention, as shown in FIG.
The male threaded rods 42, 42 of the center of gravity adjustment mechanism 6 are provided to protrude in the longitudinal direction of the horizontal member 13b of the mold aggregate 13, and the weights 43, 43 are interlocked by a weight interlocking device 44. .

The other configurations of the third embodiment are similar to those of the first and second embodiments, and the effects can also be substantially the same as those of the first and second embodiments.

〔Effect of the invention〕

As detailed above, according to the swing bed of the present invention, the following effects and advantages can be obtained.

(1) The center of gravity can be adjusted quickly and accurately by simultaneously raising and lowering a pair of weights that are attached to the lower left and right sides of the stretcher so that they can be adjusted up and down. can be done.

(2) Fine adjustment is possible because each weight can be adjusted up and down by rotating each weight relative to the threaded rod.

(3) Since the pulley forming the weight interlocking device is attached to the weight in advance, the structure is simple and the work of assembling the swing bed is simple.

[Brief explanation of the drawing]

1 to 5 show a swing bed as a first embodiment of the present invention, in which FIG. 1 is a front view thereof, FIG. 2 is a perspective view thereof, and FIG. 3 is a side view of essential parts thereof. Figure 4 is a schematic diagram showing the fluid pressure swing mechanism, Figure 5
The figure is a flowchart for explaining its operation, and Figures 6 and 7 show a rocking bed as a second embodiment of the present invention, and Figure 6 shows its hydraulic rocking mechanism. The schematic diagram and FIG. 7 are flowcharts for explaining its operation, and FIG. 8 is a side view of essential parts showing a swing type bed as a third embodiment of the present invention. 1...Movable frame, 2...Stretcher section with fence, 3...
...Spindle, 4... Bearing, 5... Fluid pressure swing mechanism,
6... Center of gravity adjustment mechanism, 10... Lower frame body, 11...
... caster, 12 ... pillar, 13 ... H-shaped aggregate,
13a...Vertical member, 13b...Horizontal member, 13
c... Dovetail groove, 14... Floor board member, 14a... Lower surface, 15... Pine, 16... Fence member, 17...
Cushion, 18... Support part, 19... Drive device, 20, 20'... Working fluid supply system, 21, 2
1'... Rocking control system, 22... Vane, 23... Fan-shaped fluid pressure chamber, 23a, 23b... End, 23c,
23d...Wall surface, 24...Casing, 25...
Fluid pressure cylinder, 25a, 25b... outer periphery of both ends, 25c, 25d... wall surface, 26... free piston made of magnetic material, 27... cylinder type pump, 2
7a, 27b...electromagnetic coil, 28a, 28a',
28b, 28b'... Working fluid supply pipe, 29... Variable orifice, 30... Oil cooler as a working fluid cooler, 31... Control device, 31a... First control section, 31b... Second control unit. Control unit, 31c...
... Rocking angle mode switching control section, 31d ... Rocking period control section, 32 ... Power switch, 33 ... Manual switch, 34 ... Rotary position sensor, 35a, 35b ... Limit switch, 3
6...clock, 37...oil tank, 38...
...Electric motor, 39...Pump for working fluid, 39
a...Discharge port, 40...Three-way switching valve, 40a, 4
0b... Electromagnetic coil, 41... Pressure valve, 42... Male threaded rod, 42a... Male threaded portion, 4
3... Cylindrical weight, 43a... Female threaded part, 44...
...Weight interlocking device, 44a...Pulley, 44b...
Wire or chain, 45...floor.

Claims (1)

[Claims] 1. It is equipped with a pedestal frame with struts erected at both ends, and a stretcher section swingably supported by the struts, and an intervening structure between the support shafts protruding from and fixed to the stretcher section and the struts. a center of gravity that adjusts changes in the center of gravity of the rocking body due to changes in the weight, etc. of a patient lying on the stretcher; A pair of weights are provided with an adjustment mechanism, and the center-of-gravity adjustment mechanism has a male threaded rod suspended from the lower portions of the left and right sides of the stretcher portion, and a female threaded portion that is screwed to the male threaded rod, and is adjusted up and down. and a weight interlocking device for simultaneously rotating a pair of weights screwed to each male threaded rod on both sides of the stretcher part at the same speed to adjust the weights up and down in conjunction with each other, A rocking bed characterized in that the weight interlocking device is composed of pulleys respectively attached to the pair of weights, and a wire or chain suspended from the same pair of pulleys.