JP3117060B2 - Swing bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a swing bed.
In particular, it relates to an improvement of the swing drive mechanism.

[0002]

2. Description of the Related Art Conventionally, severely ill patients or patients who have been subject to long-term body movement limitation (paralysis-resistant patients, people with injured heads, people with complex sclerosis, people with broken back columns, and patients with voluntary movements) Various complications (respiratory pneumonia, atelectasis, thrombophlebitis) due to the inability to move a disabled person or a severely injured patient who needs to prohibit movement including involuntary seizures) , Pulmonary embolism, urolithiasis, urinary tract infections, pressure ulcers, osteoporosis, muscle wasting, ectopic bone formation, constipation and fecal stool, orthostatic hypotension) In order to prevent various complications, a swing bed has been proposed.

FIG. 6 shows such an oscillating bed. A gantry 1 with casters 5, a column 102 erected at the center of the gantry 1 in the width direction, and an upper end of the column 102 The stretcher 2 includes a stretcher 2 that is swingably mounted on a support shaft 103 and a hydraulic cylinder 105 as a swing drive source for swinging the stretcher 2. Here, the hydraulic cylinder 105 has a lower end portion of the cylinder portion 105a swingably attached to the center of the gantry 1 in the width direction by a swing shaft 101b, while a pin 101c is provided at an eccentric position of the stretcher portion 2 of the ram 105b. It is pivoted by

Then, the hydraulic cylinder 105 is repeatedly extended and retracted, and the stretcher 2 is repeatedly pivoted in the following order: horizontal state → leftward swing → horizontal state → rightward swing → horizontal state. It can be moved.

By the way, in the above-mentioned conventional oscillating bed, the stretcher 2 swings around a support shaft 103 on a fixed point at the upper end of the support column 102. Therefore, when the stretcher 2 is swung to the left (or right), the trajectory of the left edge 11a (or the right edge 11b) of the bed 11 on the stretcher 2 should draw an arc around the support shaft 103. become. Therefore, the left edge 11a (or right edge 11
b) may possibly collide with the left end (or right end) of the gantry 1. To prevent this, the maximum swing angle may be set small, the width of the gantry 1 in the width direction may be reduced, Or it is designed to raise the support.

As a result, in the conventional oscillating bed, the desired oscillating effect cannot be obtained because the oscillating angle is narrow, the gantry is unstable due to the short width of the gantry, or There are problems such as the parts being too high.

In order to solve such a problem, the present inventors have proposed a swing bed provided with a swing guide link mechanism earlier (Japanese Patent Application No. 5-45789). In this link mechanism, as shown in FIG. 7, a pair of rods 110, 111 having the same length and arranged to intersect with each other has their lower ends fixed to the center line a of the gantry 1 by gantry pivots 110a, 111a. −a, and the upper ends thereof are respectively connected to the center line a− of the stretcher 2 by stretcher pivots 110b and 111b.
It is pivotally mounted at a position symmetrical with respect to a.

The eccentrically mounted hydraulic cylinder 105 (see FIG. 8) is contracted or extended to swing the stretcher 2 in the same manner as in the apparatus shown in FIG. 6. For example, the hydraulic cylinder 105 is contracted. When the stretcher 2 rotates rightward, as the stretcher 2 rotates right, the rods 110 and 111 rotate rightward about the gantry pivots 110a and 111a, respectively.
The stretcher pivot 110b rotates to the position shown by reference numeral 110b 'and the stretcher pivot 111b guides the stretcher 2 to the position shown by reference numeral 111b'. Then, at this time, the swing center O of the stretcher 2 moves substantially parallel to the right and moves to the position indicated by reference O '. That is, when the stretcher 2 swings rightward, the stretcher 2 moves rightward as a whole while moving rightward, so that the right edge 11 b of the bed 11 collides with the right end of the gantry 1. There is no danger, and the swing angle can be made sufficiently large. As a result, there is an advantage that the position of the stretcher does not need to be particularly high.

Since the link mechanism is formed symmetrically to the left and right, when the hydraulic cylinder 105 is extended and the stretcher 2 is turned (swinged) leftward (swinging), it is the same as when turning right. Needless to say.

[0010]

In the case of the latter (the apparatus shown in FIGS. 7 and 8), when the stretcher is inclined,
The hydraulic cylinder will support the stretcher in an inclined position, so that the supporting force of the hydraulic cylinder cannot be used effectively, so that a large-capacity hydraulic cylinder is required and a long stroke is required. Therefore, there is a problem that the apparatus cost is high. The present invention seeks to solve such a problem.

[0011]

According to a first aspect of the present invention, there is provided a oscillating bed comprising: a gantry;
A stretcher portion disposed above the mount and a pair of equal-length rods arranged to intersect with each other, and each lower end of the rod has a pair of mounts at symmetric positions of the mount. On the other hand, each of the upper ends of the rods is pivotally connected via a pivot, and each of the upper ends of the rods has a swing guide link mechanism pivotally mounted via a pair of stretcher pivots at a symmetrical position of the stretcher. Guide portions extending in the longitudinal direction of the respective rods are formed on surfaces facing each other, and a sliding body is provided so that both ends thereof are slidably fitted to both of the guide portions. A driving device capable of reciprocating the sliding body in the horizontal direction is provided, and the two rods are effectively moved so that the stretcher can swing by the horizontal reciprocation of the sliding shaft by the driving device. The length, the distance between the pair of gantry pivots, and the Interval is characterized in that is set.

According to a second aspect of the present invention, there is provided the oscillating bed according to the first aspect, wherein the guide portion is formed by a guide rail attached to each of the rods. Rollers capable of rolling contact with the guide rail are attached to both ends of the sliding shaft.

[0013] The oscillating bed according to claim 3 further comprises:
The oscillating bed according to claim 1 or 2, wherein the driving device is formed of an electric motor, and a horizontally arranged screw shaft that is rotationally driven by the electric motor is provided,
On the other hand, a nut portion capable of being screwed with the screw shaft is formed on the sliding body.

According to a fourth aspect of the present invention, there is provided the oscillating bed according to any one of the first to third aspects, wherein the effective length of the both rods is 444.77 mm, and the distance between the pair of pedestal pivots. , And the distance between the pair of stretcher shafts is 229 mm.

According to a fifth aspect of the present invention, in the rocking bed, a gantry, a stretcher provided above the gantry, and a pair of equal lengths intersecting each other are provided. And each lower end of the same rod is pivotally connected to a symmetrical position of the above-mentioned pedestal via a pair of pedestal pivots, while each upper end of the same rod is paired at a symmetrical position of the above-mentioned stretcher. And a swing guide link mechanism pivotally attached via a stretcher shaft of the stretcher, and a guide portion extending in the length direction of the rod is formed on one of the pair of rods. A sliding member having a slidable engaging portion is provided so as to be capable of reciprocating in a horizontal direction by a driving device.

A swing bed according to a sixth aspect of the present invention,
6. The oscillating bed according to claim 5, wherein the driving device is formed of an electric motor, and a horizontally arranged screw shaft that is rotationally driven by the electric motor is provided. A nut portion capable of being screwed is formed.

[0017]

In the swing type bed according to the present invention, the stretcher section swings while being guided by the pair of rods of the swing guide link mechanism. Then, since the pair of rods rotate about the respective pivots of the respective rods with respect to the gantry, the swinging part swings while swinging while moving the swing center substantially horizontally in the direction of rotation. Rotation of each rod about each gantry pivot moves the sliding body in the horizontal direction, and applies rollers attached to both ends of the sliding body along guide portions (guide rails) formed on each of the rods. This is done by rolling the rollers together.

The effective length of each of the rods, the distance between the pair of pedestal pivots, and the distance between the pair of pallet pivots are set so that each of the rods can be rotated by moving the sliding body in the horizontal direction. Each is set to a predetermined size. In particular, in the case of the oscillating bed according to the third and sixth aspects, since the screw mechanism formed by the screw shaft and the nut portion screwed to the screw shaft has a decelerating action, a large oscillating motion is achieved by a small electric motor. Driving force can be obtained.

Further, in the case of the oscillating bed according to the fifth and sixth aspects, since only one of the rods is engaged with the sliding member, the sliding can be performed without setting the main part dimensions as described above. The moving body can reciprocate in the horizontal direction.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a swing type bed according to an embodiment of the present invention when the stretcher is in a horizontal position (neutral state). FIG. FIG. 3 is a front view when the stretcher is at the left tilt position, FIG. 4 is a front view of the drive mechanism, and FIG. 5 is a view taken along the line AA of FIG. 1 to 5
6, the same reference numerals as those in FIGS. 6 to 8 indicate substantially the same members.

As shown in FIG. 1, the oscillating bed of this embodiment also includes a gantry 1 and a stretcher 2 disposed above the gantry 1 in the front-rear direction (the direction perpendicular to the plane of FIG. 1). Direction) and a pair of equal-length rods 3 and 4 arranged so as to cross each other. Reference numeral 5 indicates wheels (casters) attached to the gantry 1. The lower ends of the rods 3 and 4 are pivotally attached to the longitudinal end surface of the gantry 1 via a pair of gantry pivots 6 and 7, and the upper ends of the rods 3 and 4 are laid via a pair of gantry pivots 8 and 9. It is pivotally attached to the longitudinal end face of the stretcher 2 to form a swing guide link mechanism.

A bed 11 is detachably mounted on the upper surface of the stretcher 2. When the stretcher 2 is parallel to the gantry 1 (when the stretcher 2 is in a horizontal state), the pair of rods 3 and 4
Are arranged symmetrically with respect to the center line aa as shown in FIG. 1, and their geometrical intersection points are also located on the center line aa. Rails 1 having a U-shaped cross section that extend in the longitudinal direction of the rods 3 and 4 and constitute a guide portion on surfaces of the rods 3 and 4 facing each other.
3, 14 are attached.

On the other hand, a machine frame 20 is erected on the gantry 1,
A screw shaft 21 is horizontally attached to the machine frame 20 with both ends thereof rotatably supported (see FIG. 4). The machine frame 20 is formed integrally with the gantry 1 in a zigzag manner by a pair of left and right vertical frames 20b having lower ends attached to the gantry 1 and both vertical rods 20a. The female screw 18 formed at the center of the sliding body 17 is screwed and attached to the screw shaft 21,
The screw shaft 21 and the female screw 18 constitute a screw mechanism.

Further, a slide needle bearing 19 provided with a flexible band 19a which slides in a crawler shape on the lower surface of the horizontal frame 20a of the machine frame 20 is attached to the upper surface of the sliding body 17, and the left and right sides of the machine frame 20 are provided. A pair of circular holes 17a through which a pair of guide rods 22 having a circular cross section attached between the vertical frames 20b can penetrate are formed in the sliding body 17 (see FIG. 5). The pair of guide rods 22 are attached below the screw shaft 21 in parallel with the screw shaft 21 and in parallel with each other. In this way, the screw shaft 21
When rotating forward and backward, the sliding body 17 along the screw shaft 21,
In FIGS. 1 and 4, it is possible to reciprocate in the left-right direction.

Shafts 15a and 16a are protrudingly provided on opposite sides of the sliding body 17 in opposite directions, and the two shafts 15a and 16a are respectively rolled on rails 13 and 14 attached to the rods 3 and 4, respectively. Possible rollers 15, 16 are rotatably mounted.
Electric motor 30 as a drive source for rotating screw shaft 21 forward and reverse
Is attached to the gantry 1. Output shaft of electric motor 30
A power consisting of a spur gear 32, 33, a worm gear 34, a transmission shaft 35, 36, a set of bevel gear 37, and a gear 38 meshing with the gear 31 between the gear 30a and the gear 31 attached to the screw shaft 21. A transmission mechanism 39 is interposed.

In this embodiment, the above-described drive mechanism including the rods 3, 4, the sliding body 17, the screw shaft 21, the power transmission mechanism 39, the electric motor 30, and the like can be mounted on any of the front and rear ends of the oscillating bed. Or one of them. The drive mechanism may be provided at both front and rear ends of the oscillating bed. In that case, however, a control device for synchronously operating both electric motors 30 is required.

In the above configuration, when the electric motor 30 is driven from the state shown in FIG.
The sliding body 17 screwed to 21 moves rightward in FIGS. The roller 15 attached to the slide 17 is the rod 3
Of the sliding member 17
The rod 3 rotates clockwise about the gantry pivot 6 as the rod moves left and right.

Since the sliding member 17 is also provided with a roller 16 which is rotatably fitted to the rail 14 of the rod 4, the rod 4 also moves about the gantry pivot 7 as the sliding member 17 moves to the right. When the sliding body 17 rotates clockwise and the sliding body 17 moves to the end point of the rightward movement, the rods 3 and 4 are in the inclined state shown in FIG. 2, and by tilting the rods 3 and 4 in this manner, The gantry 2 attached to each upper end of the rods 3 and 4
And the bed 11 can be tilted to the right.

When the electric motor 30 is rotated in the reverse direction to rotate the screw shaft 21 from the state shown in FIG.
When the slider 17 moves to the left and passes through the neutral state (horizontal posture) shown in FIG. 1 and the sliding body 17 moves to the end point of the leftward movement, the rods 3 and 4 become inclined as shown in FIG. State
By tilting the rods 3 and 4 in this way, the gantry 2 and the bed 11 can be tilted to the left. By the way, when the above-mentioned rods 3 and 4 rotate rightward or leftward, the rods 3 and 4 respectively rotate around the gantry pivots 6 and 7, and generally, that is, except for special cases. The geometrical intersection of the two rods 3, 4 does not move linearly.

However, in this embodiment, the effective length of the pair of rods 3 and 4 (the distance between the pivots 6 and 9 and the pivots 7 and
8) is 444.77 mm, the distance between the pair of gantry pivots 6 and 7 is 400 mm, and the distance between the pair of stretcher pivots 8.9 is 2
By setting the distance to 29 mm, when the sliding body 17 is moved from the neutral state to the left and right by 138 mm (the total stroke is 276 mm), the displacement of the sliding body 17 in the vertical direction can be up to 1,74 mm.
The sliding member 17 can be moved almost linearly by such a design.

As a result of the above-described dimension setting, the vertical dimension between the gantry pivots 6 and 7 and the center of the sliding body 17 in the neutral state is 20
The vertical dimension between the gantry pivots 6 and 7 and the stretcher pivots 8 and 9 is 314.5 mm. Black points a to m in FIG. 4 indicate geometric plots of the center point X of the sliding body 17 when the sliding body 17 is moved left and right.

The above-mentioned displacement of 1,747 mm corresponds to the rod 3,
4 and the backlash of each of the pivots 6, 7, 8, 9 and the backlash of the rollers 15, 16 against the rails 13, 14. Further, since the slide needle bearing 19 and the guide rod 22 act to linearly move the sliding body 17, the sliding body 17 can be substantially linearly moved. As described above, the stretcher can be swung by the horizontal linear reciprocating motion of the sliding body 17, so that, for example, when a hydraulic cylinder is used as a drive source, the operating force of the hydraulic cylinder can be used efficiently, and Can be used.

In addition, it is possible to employ a simple drive mechanism that uses an electric motor as a drive source and converts the rotational motion into a linear motion by a screw mechanism, and can utilize the deceleration function of the screw mechanism. In addition, the electric motor can be reduced in capacity. Note that the rotary output shaft of the electric motor may be horizontally arranged, a screw may be engraved on the rotary output shaft, and the screw may be screwed into the sliding body 17 so that the linear sliding body 17 is reciprocated by the electric motor. .

In the embodiment described above, a pair of rollers 15 and 16 are rotatably mounted on the sliding body 17 and both rollers 15 and 16 are rolled and contacted with the rails 13 and 14 of the rods 3 and 4, respectively. Since the driving force of 30 is distributed to the two rods 3 and 4, the load on each of the rods 3 and 4 can be reduced, and the rollers 15 and 16 are sandwiched between the rods 3 and 4. , Without the risk of falling off, and therefore a U-shaped rail 1
Although there is an advantage that the use of the three and the four is possible and the assembling becomes easy, the effective length of the two rods 3 and 4, the interval between the pair of gantry pivots 6 and 7, and the pair of the stretcher part pivots 8 and 9 are provided. There is a restriction that each interval must be set to a predetermined value.

Next, a modified example of the simplified structure which solves this point will be described. That is, the roller 15 or the roller is
Only one of the rollers 16 is rotatably mounted, and a rail that rotatably fits the roller 15 or the roller 16 is mounted on one of the rods 3 and 4. In this modification, the rail is

[Outside 1] The ends are U-shaped for assembly.)

Also in the case of this modification, the sliding member 17 is moved in the left and right direction (see FIGS.
In the left and right directions), the swinging of the stretcher is performed by rotating the rod 3 (or 4) via the roller 15 (or 16), and the sliding body 17 and the roller 15 (or 16) are rotated.
Since only one of the rods 3 (or 4) is engaged via the shaft, the stretcher 2 can be rocked without any dimensional restriction as in the above-described embodiment. .

Further, a second modified example of the simplified structure will be described. In the second modification, the driven end (the left end in FIG. 1) of the screw shaft 21 is supported by the vertical frame 20b of the machine frame by a spherical bearing, and the drive end (the right end in FIG. 1). Along the guide formed on the vertical frame 20b of the machine frame,
It is mounted so that it can move vertically. Therefore, in the second modified example, the sliding body 17 is moved up and down as the sliding body 17 is moved in the horizontal direction without the dimensional restriction as in the above-described embodiment in order to move the sliding body 17 substantially horizontally. , The screw shaft 21 can swing around the spherical bearing at the driven side end to follow the vertical displacement of the sliding body 17, and the stretcher swings. .

Since the drive-side end is vertically displaced, a mechanism corresponding to this displacement (for example, a timing belt type transmission mechanism constantly tensioned by a tension pulley) is employed as a part of the drive mechanism. There is a need.

[0038]

As described above, according to the swing bed of the present invention, the following effects and advantages can be obtained. (1) Since the stretcher can be rocked by horizontal linear reciprocating motion, for example, when a hydraulic cylinder is used as a drive source, the operating force of the hydraulic cylinder can be used efficiently. (2) It is possible to use a simple drive mechanism that converts the rotational motion of a drive source having a rotational motion output such as an electric motor into linear motion by a screw mechanism. (3) In the case of (2) above, the deceleration function of the screw mechanism can be used,
The capacity of the driving source can be reduced. (4) The gantry can be swung largely without increasing the height of the gantry, and a large oscillating angle can be obtained while keeping the width of the gantry large. Good. (5) The load on the stretcher is dispersed, which is advantageous in terms of durability.

[Brief description of the drawings]

FIG. 1 is a front view of a swing type bed according to an embodiment of the present invention when a stretcher is in a horizontal position (neutral state).

FIG. 2 is a front view when the stretcher is at a right tilt position.

FIG. 3 is a front view when the stretcher is at a left tilt position.

FIG. 4 is a front view of the driving mechanism.

FIG. 5 is a view taken in the direction of arrows AA in FIG. 4;

FIG. 6 is a front view of a conventional rocking bed.

FIG. 7 is a front view showing another conventional rocking bed with a hydraulic cylinder omitted.

FIG. 8 is a front view in which the description of the link mechanism is omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mount 2 Stretch part 3, 4 Rod 5 Caster 6, 7 Mount pivot 8, 9 Strut pivot 11 Bed 13, 14 Rail 15 and 16 as guide part Roller 15a, 16a Shaft 17 Sliding body 17a Round hole 19 Slide needle bearing 19a Flexible belt 20 Machine frame 20a Horizontal frame 20b Vertical frame 21 Screw shaft 22 Guide rod 30 Electric motor 30a Output shaft 39 Power transmission mechanism

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toru Takahashi 363-1 Aonohara, Tsukui-cho, Tsukui-gun, Kanagawa Prefecture 1 Japan MDM Tsukui Factory (56) References JP-A-6-233716 (JP) , A) Japanese Patent Publication No. 5-82216 (JP, B2) Japanese Patent Publication No. 6-53086 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61G 7/008

Claims (6)

(57) [Claims] 1. A oscillating bed, comprising: a gantry, a stretcher disposed above the gantry, and a pair of equal-length rods intersecting each other. Each lower end is pivotally connected to a symmetric position of the gantry via a pair of gantry pivots, while each upper end of the rod is pivotally attached to a symmetric position of the gantry via a pair of gantry pivots. A guide portion extending in the longitudinal direction of each of the pair of rods is formed on opposing surfaces of the pair of rods, and is slidable on both sides with each of the two guide portions. A sliding body having an engaging portion is provided so as to be capable of reciprocating in a horizontal direction by a driving device. The reciprocating movement of the sliding body in a substantially horizontal direction by the driving device causes the swinging of the stretcher in the left-right direction. So that the effective length of the two rods, A swing bed, wherein a distance between a pair of gantry pivots and a distance between a pair of stretcher part pivots are set. 2. The oscillating bed according to claim 1, wherein the guide portion is formed by a guide rail attached to each of the rods, and each engagement portion of the sliding body is each of the guide rails. An oscillating bed, comprising a roller which can be rolled and contacted with the bed. 3. The oscillating bed according to claim 1, wherein the driving device is formed of an electric motor, and a horizontally arranged screw shaft that is driven to rotate by the electric motor is provided. An oscillating bed, wherein a nut portion that can be screwed with the screw shaft is formed on a sliding body. 4. The swing bed according to claim 1, wherein an effective length of the two rods is 444.77 mm, a distance between a pair of gantry pivots is 400 mm, and a distance between a pair of stretcher part pivots is 229 mm. A oscillating bed characterized in that the bed is configured to each of the following dimensions. 5. A oscillating bed, comprising: a gantry, a stretcher disposed above the gantry, and a pair of equal-length rods intersecting each other. Each lower end is pivotally connected to a symmetric position of the gantry via a pair of gantry pivots, while each upper end of the rod is pivotally attached to a symmetric position of the gantry via a pair of gantry pivots. A guide portion extending in the longitudinal direction of one of the pair of rods is provided, and the guide portion has a slidable engaging portion. An oscillating bed, wherein the sliding body is provided so as to be capable of reciprocating in a horizontal direction by a driving device. 6. The oscillating bed according to claim 5, wherein the driving device is formed by an electric motor, and a horizontally arranged screw shaft rotatably driven by the electric motor is provided. A swingable bed, wherein a nut portion capable of being screwed with the screw shaft is formed on the bed.