JPH08117293A - Pitch type rocking bed - Google Patents

Abstract

PURPOSE: To prevent the occurrence of torsional deformation due to an eccentric load of a rocking frame by arranging a hydraulic cylinder on the center axial line of a bed. CONSTITUTION: A hydraulic cylinder 13 positioned on the center axial line of a bed is installed between a rocking frame 10 and a base frame 1, and telescopically operated to vertically move the frame 10 at a position near the top section thereof. Also, a gate type support frame 20 of rigid structure is erected between the rocking frame 10 and an intermediate frame 2, so as to resist the torsional deformation of the rocking frame 10 due to an eccentric load, thereby allowing a stable vertical rocking motion simply through the arrangement of the hydraulic cylinder only on an intermediate axial line, instead of a pair of right and left cylinders conventionally required. The frame 20 has a base section fitted to a support shaft 11 and a shoe 23 at the forward end thereof is slidably coupled to a dovetail groove 17a on the frame 10, thereby allowing the vertical rocking rotation of the frame 10 to be followed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pitching type rocking bed, and more particularly to improvement of a rocking drive mechanism thereof.

[0002]

2. Description of the Related Art Conventionally, severely ill patients and patients who have been subject to long-term limitation of body movement (paralysis-resistant patients, people with head injuries, people with complex sclerosis, people with broken spines, and patients have been given voluntary exercise Various complications (submissive pneumonia, atelectasis, thrombophlebitis) due to immobility or severely injured patients who need to prevent movement of patients including involuntary convulsive movements to lie in hospital beds , Pulmonary embolism, urinary stones, urinary tract infections, pressure ulcers, osteoporosis, muscle wasting, ectopic bone formation, constipation and stools, orthostatic hypotension. A rocking bed has been proposed to prevent various complications.

As the rocking bed, a roll-type rocking bed that is rotated around a longitudinal axis of the bed alternately in a left-right direction by a predetermined angle, and a head side and a leg side of the bed are alternately arranged. A vertical swing type rocking bed which is designed to be lifted up is known.

In the case of a vertical rocking type rocking bed, between the rocking frame and the base frame, the head side extension / contraction drive means (eg hydraulic cylinder) and the leg side extension / contraction drive means (eg hydraulic pressure) are provided. Cylinder) is interposed, and both hydraulic cylinders are alternately extended and contracted to perform pitching of the rocking frame. In order to prevent the rocking frame from being twisted and deformed when an eccentric load is applied to the moving frame), conventionally, a pair of left and right hydraulic cylinders are provided near the head and near the legs, respectively.
Vertical swing is performed while supporting the swing frame on both left and right sides.

[0005]

By the way, as described above, it is effective to prevent the deformation due to the eccentric load by disposing a pair of hydraulic cylinders on the head side and on the leg side, respectively. When pitching the frame vertically,
There is a problem that a pair of left and right hydraulic cylinders must be expanded and contracted in a precisely synchronized manner, which necessitates a complicated control device and causes an increase in cost.

The present invention is intended to solve such a problem, and one telescopic drive means is attached to each of the head side and the leg side at the center of the longitudinal direction of the bed so that the vertical direction of the swing frame is increased. By swinging, the control device can be simplified and the cost can be reduced, while a highly rigid gate-type support frame is attached to stabilize the bed. To aim.

[0007]

In order to achieve the above object, the pitching type rocking bed according to claim 1 is supported by the base frame and the base frame in the pitching type rocking bed. An intermediate frame and an oscillating frame supported by the intermediate frame so as to be vertically swingable. A pair of left and right supporting shafts, which serve as a center of rotation when the oscillating frame is vertically swung, have a head side end of the intermediate frame. The base frame, which is respectively provided near the part and the end on the leg side, and faces the respective positions of the end on the head side and the end on the leg side on the center line in the longitudinal direction of the swing frame. One expansion / contraction drive means is interposed between the upper and lower positions, and each expansion / contraction end of each expansion / contraction drive means is connected to the rocking frame on each straight line connecting the pair of left and right support shafts. Each is pivotally attached via an axis A supporting frame capable of countering the eccentric load acting on the swing frame following the vertical swing rotation of the swing frame is interposed between the swing frame and the intermediate frame. Is characterized by.

According to a second aspect of the present invention, there is provided the vertical rocking bed according to the first aspect, wherein the support frame pivots the base frame on the pair of left and right supporting shafts. A pair of left and right pivoting arms that are movably supported and a horizontal rod that is rigidly connected between the respective tip ends of the pivoting arms constitute a gate-type supporting frame, while the pivoting frames are provided on both sides of the pivoting frame. Dovetails parallel to the longitudinal direction are formed,
A shoe member slidably fitted in each dovetail groove is attached to each of the gate-shaped support frames.

Further, the pitching type rocking bed according to claim 3 is the pitching type rocking bed according to claim 1 or 2, wherein the pair of left and right supports is provided on both left and right side surfaces of the rocking frame. It is characterized in that the shaft is provided with a bearing member which is fitted respectively from above to act as a bearing when the swing frame is rotated.

[0010]

In the above-described vertical rocking bed of the present invention, when one of the expansion / contraction driving means near the head side end or the leg side end is expanded / contracted, the rocking frame is moved to the opposite side. Tilting (vertical rotation) with the spindle near the end as the center of rotation
To do. At this time, the gate-shaped support frame is displaced following the swing frame, and acts to prevent the swing frame from being twisted and deformed by the eccentric load.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vertical type rocking bed as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view thereof, FIG. 2 is a side view showing its vertical shaking state, and FIG. ,
(b) is its front view, FIG. 4 is its side view showing its horizontal state,
5 is a plan view of the same, and FIG. 6 is a cross-sectional view near the dovetail groove of FIG.
6 is a sectional view taken along the line VI-VI of FIG. 7, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5, FIG. 8 is an enlarged side view of an essential part thereof, and FIG. 9 is an enlarged side view of the vicinity of the bearing member.

In FIGS. 1 and 2, reference numeral 1 indicates a base frame, and an intermediate frame 2 is arranged above the base frame 1. A pair of left and right links 3 and 4 (referred to as link 3,
4 are provided at the head-side end (left end in FIG. 2) and the leg-side end (right end in FIG. 2) of the bed, respectively.], The base frame 1 and the intermediate frame. By extending and contracting the rolling hydraulic cylinder 5 interposed between the center and the center of the bed, the center line A-A in the longitudinal direction of the bed is taken.
As shown by the chain double-dashed line in FIG. 3 (a), the intermediate frame 2 can be horizontally swung (horizontally rotated) to the left or right around the center (see FIG. 5).

Reference numeral 6 denotes casters attached to the four corners of the base frame 1. Also, reference numerals 3a and 4a
[Figs. 3 (a) and 3 (b)] show the pivots of the links 3 and 4.
A swing frame 10 is arranged above the intermediate frame 2. A mat (not shown) is laid on the upper surface of the swing frame 10.

The swing frame 10 is a head-side support shaft projecting from both side surfaces of the intermediate frame 2 near the head and legs.
11 and a first tilting state in which the head side is lifted about one of the shafts 12 of the leg side as a rotation center (see FIG. 2).
(State shown in solid line) and the second part where the leg side is lifted
In the tilting state (state shown by the chain double-dashed line in FIG. 2), by selecting and operating either one of the pitching hydraulic cylinders 13 and 14, it becomes possible to pitch (pitch rotation). There is.

That is, the swing frame 10 is rotated (vertical pitch).
For this purpose, hydraulic cylinders 13 and 14 are arranged near the head-side end and the leg-side end of the base frame 1 with their base ends pivotally attached by pivots 13c and 14c, respectively. The upper ends of the piston rods (expanding and contracting ends) 13a and 14a of the hydraulic cylinders 13 and 14 are attached to the cross members 15 and 16 attached to the swing frame 10 to the brackets 15a and 16a.
It is attached via the rotating pins 13b and 14b.

The hydraulic cylinders 13 and 14 are interposed between the intermediate frame 2 and the swing frame 10. Code 2b
And 2c are intermediate frames 2 for axially supporting the base ends of the hydraulic cylinders 13 and 14 via shafts 13c and 14c.
Shows the bracket attached to the. Note that the brackets 2b and 2c are shown in FIG.
Description is omitted in the other drawings.

Here, in this embodiment, the swing frame 10 is rotated in each tilting direction by a dedicated hydraulic cylinder 13 (or 14) as a telescopic drive means. There is. Therefore, the hydraulic cylinders 13 and 14 are arranged on the longitudinal centerline AA of the bed, that is, the swing frame 10.

The rotary pins 13b and 14b are located on the straight lines B--B and C--C connecting the support shafts 11 and 12, respectively (see FIG. 5), and one hydraulic cylinder 13 ( Or 14) by expanding and contracting the rocking frame 10
The other hydraulic cylinder 14 (or 1
3) does not hinder the tilting of the swing frame 10.

As described above, the hydraulic cylinders 13 and 14 are both arranged on the longitudinal centerline AA of the bed, and the tilting of the swing frame 10 in each direction is performed by one dedicated unit. Since the hydraulic cylinder 13 (or 14) is used, when the rocking frame 10 is tilted, if a lateral eccentric load is applied to the rocking frame 10, the rocking frame 10
There is a risk that the 10 will be twisted, tilted to the left or right, or the bed will tip over.

In order to prevent such inconvenience, in this embodiment, the following portal support frames 20 are attached to the head side and the leg side, respectively. Since the gate-type support frame 20 has exactly the same configuration on the head side and the leg side, the gate-type support frame 20 attached to the head side will be described in detail below.

The gate type support frame 20 is composed of a pair of left and right rotating arms 21 and 21, and a horizontal rod 22 mounted between the front end portions of both rotating frames 21 and 21. Each base end of 21 is rotatably attached to a pair of left and right support shafts 11 attached to the intermediate frame 2 (see FIG. 2).
Here, the horizontal rod 22 is firmly coupled to each upper end portion of the rotating arms 21 and 21, and together with the pair of rotating arms 21, constitutes a highly rigid gate-shaped support frame 20. Furthermore, the rotating arm 21,
The shoe members 23, 23 are respectively attached to the pins 24,
It is pivoted by 24.

On the other hand, dovetail grooves parallel to the length direction of the swing frame 10 are formed on the left and right lower surfaces near both ends of the swing frame 10.
A guide plate 17 formed with 17a is attached (Fig. 6).
Each shoe member 23 is formed with a shoe 23a slidably fitted in each dovetail groove 17a. Hydraulic cylinder 13
Or, one of the two is extended to lift the head side of the rocking frame 10 in the first tilting or the leg part in the second tilting, and the rocking frame 10 supports the leg side supporting shaft.
12 or the spindle 11 on the head side is tilted about the center of rotation.

For this purpose, the support shafts 12 or 11 are fitted on both side surfaces of the swing frame 10 near the legs or the head from above to support the bearings during the first or second tilting of the swing frame 10. Bearing members 30 acting as are respectively attached (see FIG. 9). The bearing member 30 is formed with an opening 30a having an inclined surface that expands downward, and there is some error in the length direction between the support shaft 11 or 12 and the swing frame 10. The bearing member 30 to the support shaft 11 or 12
It can be easily fitted to. Further, when the swing frame 10 tilts, the bearing member 30 on the lifted side can be detached upward from the support shaft 11 or the support shaft 12 through the opening 30a.

In the above structure, when the hydraulic cylinder 13 is extended so as to bring the swing frame 10 from the horizontal state to the first tilting state in which the head side is lifted, the swing frame is moved.
10, the bearing member 30 on the leg side engages with the support shaft 12 and becomes the center of rotation, and the swing frame 10 rotates clockwise in FIG. 2 to raise the head side of the first frame. It is in a tilted state (state shown by solid line in FIG. 2).

At the start of this tilting, the bearing member 30 on the head side
Needless to say, the shaft is disengaged upward from the support shaft 11, and since the tilting rotation is performed around the support shaft 12, that is, the axis C-C, the hydraulic cylinder 14 does not interfere with the tilting rotation. With this tilting, the portal support frame 20 on the head side rotates clockwise around the support shaft 11 in FIG. 2, and at this time, the shoe member 23 of the portal support frame 20 slides in the dovetail groove 17a. To follow.

As described above, since the portal support frame 20 is always displaced integrally with the swing frame 10 when the swing frame 10 tilts, an eccentric load acts on the swing frame 10 to swing the swing frame 10. Even if the frame 10 is twisted, the gate-shaped support frame 20 acts against this twist,
The swing frame 10 is not easily twisted and deformed.

That is, a pair of left and right rotating arms 21, 21 constituting the gate-shaped support frame 20 are slidably fitted to the dovetail grooves 17a on both sides of the swing frame 10 via shoes 23a, The support frame 20 and the swing frame 10 form an integral structure. Therefore, in order for the rocking frame 10 to undergo torsional deformation, it is necessary to use a highly rigid gate-type support frame.
20 will be transformed. However, the portal support frame
Since the structure of 20 does not easily deform, even if an eccentric load is applied to the swing frame 10, the gate-shaped support frame 20 sufficiently opposes this eccentric load, and the swing frame 10 is easily There is no deformation.

Therefore, although the single hydraulic cylinder 13 is attached to the central portion of the swing frame 10, stable vertical pitching and tilting can be achieved. When the hydraulic cylinder 13 is contracted from the first tilted state, the rocking frame 10 in the first tilted state rotates counterclockwise around the support shaft 12 in FIG. 2 and returns to the horizontal state. At this time, the bearing member 30 near the head is fitted onto the support shaft 11 from above, and the swing frame 10 is stably supported on the intermediate frame 2.

When the swing frame 10 which has returned to the horizontal state in this way is brought into the second tilted state in which the hydraulic cylinder 14 is extended and the leg side is lifted, the swing frame 10 causes the support shaft 11 to move. As a center, it rotates counterclockwise in FIG. 2 (state shown by a chain double-dashed line in FIG. 2). It goes without saying that, at this time, the gate-shaped support frame 20 on the leg side operates so as to stabilize the swing frame 10, as in the case of the first tilted state described above.

In this way, the rocking frame 10 is changed from the horizontal state to the first tilting state in which the head side is lifted, to the horizontal state, to the second tilting state in which the leg side is lifted, to the horizontal state.
By operating the pair of hydraulic cylinders 13 and 14 sequentially,
Can be rocked. In this case, since it is only necessary to operate one hydraulic cylinder for each tilting direction, it is possible to reduce the equipment cost and simplify the control system (compared to the case where two hydraulic cylinders are operated in synchronization). Become.

In the above embodiment, the hydraulic cylinder is used as the expansion / contraction driving means, but the expansion / contraction driving means is composed of a screw rod which is rotationally driven by, for example, an electric motor and a nut which is screwed to the screw rod. However, the same effects as those of the hydraulic cylinder can be obtained. In this case, it is preferable to rotatably attach the screw rod to the intermediate frame 2 and attach the nut to the swing frame 10 in order to prevent vibration.

[0032]

As described in detail above, according to the vertical swing type rocking bed of the present invention, the following effects and advantages can be obtained. (1) The bed can be vertically rocked by providing only one hydraulic cylinder on each of the head side and the leg side, so that the structure is simple and the weight can be reduced. (2) By the above (1), the control system of the hydraulic cylinder can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a pitching type rocking bed as one embodiment of the present invention.

FIG. 2 is a side view showing the same vertical pitching state.

FIG. 3 (a) is a front view showing the same rolling state. (b) A front view showing the same horizontal state.

FIG. 4 is a side view showing the horizontal state.

FIG. 5 is a plan view of the same.

6 is a cross-sectional view near the dovetail groove and is a cross-sectional view taken along the line VI-VI of FIG.

7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is an enlarged side view of the relevant part.

FIG. 9 is an enlarged side view of the vicinity of the bearing member.

[Explanation of symbols]

 1 Base frame 2 Intermediate frame 3,4 Link 5 Rolling hydraulic cylinder 6 Castor 10 Swing frame 11,12 Spindle 13,14 Vertical swing hydraulic cylinder 15,16 Cross member 17 Guide plate 17a Dovetail 20 Gate type support Frame 21 Rotating arm 22 Horizontal rod 23 Shoe member 23a Shoe 24 Pin 30 Bearing member 30a Opening

Claims (3)

[Claims] 1. A vertical swing type rocking bed comprising a base frame, an intermediate frame supported by the base frame, and a swing frame supported by the intermediate frame so as to be vertically swingable. A pair of left and right support shafts, which serve as the center of rotation during the vertical swing rotation, are provided respectively near the head-side end and the leg-side end of the intermediate frame, and the head on the longitudinal centerline of the swing frame. One expansion / contraction driving means is provided between each position near the side end portion and the leg side end portion and a position on the base frame facing the position, and each expansion / contraction driving means. Each of the expansion and contraction ends of is pivotally attached to the rocking frame via a pivot on each straight line connecting the pair of left and right supporting shafts, and is attached to the rocking frame in accordance with the vertical swing rotation of the rocking frame. Eccentric load acting Support frame could challenge, characterized in that it is interposed between the swing frame and the intermediate frame, the pitch wobble bed. 2. The vertical rocking bed according to claim 1, wherein the support frame includes a pair of left and right rotating arms whose base ends are rotatably supported by the pair of left and right supporting shafts.
A horizontal rod rigidly coupled between the front end portions of the rotary arms constitutes a gate-shaped support frame, and dovetail grooves parallel to the longitudinal direction are formed on both sides of the swing frame. A vertical rocking type rocking bed, characterized in that shoe members slidably fitted in the dovetail grooves are attached to the respective gate type support frames. 3. The vertical rocking bed according to claim 1 or 2, wherein the left and right side surfaces of the rocking frame are fitted to the pair of left and right supporting shafts from above, respectively. A pitching type rocking bed, characterized in that it is provided with a bearing member that acts as a bearing when rotating.