JP2002315796A - Bedsore prevention mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reasonably reduce an intake sound and an exhaust sound of an intake and exhaust valve provided in a bedsore prevention mat. SOLUTION: An intake and exhaust valve A is comprised of, a nearly tubular valve body 51a forming parts of first and second air passages 21 and 22, the intermediate portion of the valve body 51a, and by providing a connecting portion 51b integrally connecting air chambers 1' and 2' of first and second air cells 1 and 2, and an air passage 21a communicatively connecting end connections 51d in the valve body 51a, providing an intake and exhaust route 8 communicatively connecting the air passage 21a and the air chambers 1' and 2' of the first and second air cells 1 and 2 in the connecting portion 51b, and expanding the diameter of the intake and exhaust route 8 from the opening 8a on the air passage side end to an opening 8b on the air chambers 1' and 2' side of the air cells 1 and 2, a swirl of air current occurring in the opening 8b of the intake and exhaust route 8 is reduced and an intake sound and an exhaust sound are reduced at the time of intake and exhaust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mat for preventing floor rubbing, and more particularly, to an improvement in a mat for preventing floor rubbing which alternately takes in and exhausts air cells constituting a mat body.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show a conventional mat for preventing floor rubbing. This floor rubbing prevention mat 100
The air cells 100a and the air cells 100b, each of which is configured to expand into a substantially cylindrical shape, are alternately arranged on the sheet 101 and are arranged in parallel.
And 100b are held by a holding belt 102 to form an integral mat body 100 '. The upper surface of the mat body 100 'described above is covered with a sheet 100c for use. The floor rubbing prevention mat 100 has two systems of air passages, that is, a first air passage 103a and a second air passage 103a.
And an air passage 103b. First air passage 103
a, the second air passage 103b includes an intake / exhaust valve 105a,
Alternatively, an intake / exhaust passage 105 provided in the intake / exhaust valve 105b.
a ', 105b', each air cell 100 described above.
a or each of the air cells 100b.

The first and second air passages 103a and 103b are respectively connected to an air supply device (not shown) such as a compressor and an operating valve, and air is supplied to air cells 100a and 100b having different systems. Supply and exhaust are controlled separately. That is, the floor rubbing prevention mat 100 is made up of the air cells 100a and 100a.
b), air is exhausted from the air chamber of the other air cell by opening an operating valve (not shown) at the same time as inhaling and expanding the air passage of one of the systems. By repeating this at predetermined intervals between the air passages 100a and 100b of both systems, the air cells 100a and the air cells 100b alternately expand and contract alternately.

[0004]

FIG. 12 to FIG.
The intake / exhaust valve 105a (same for 105b) used for the above-mentioned conventional floor rubbing prevention mat 100 is shown. The intake and exhaust valve 105a includes a hollow and nipple-shaped valve body 132 having connection ports 131 at both ends, a central portion of the valve body 132, and the first and second air cells 100.
a, a communication unit 133 for integrally communicating with the air chambers of 100b
And are integrally molded. At the end of this communication part 133,
A plate 136 is formed, and the plate 136 is adhered by being sandwiched between outer skins of the first and second air cells 100a, 100b, thereby forming the air cells 100a, 10b.
The intake and exhaust valves 105a and 105b are provided at one end of the valve 0b.

[0005] As shown in FIG.
The connection ports 131 at both ends are connected to the first and second air passages 103.
a, 103b, the air supply pipes 130a, 130b
(FIG. 13). Further, in the communication portion 133, the intake / exhaust passage 105a '(1) communicating between the air passage 134 communicating between the connection ports 131 of the valve body 132 and the air chambers of the first and second air cells.
05b ').

[0006] As shown in FIG.
5a 'and 105b' extend through the air passage 1 straight.
34 and the air chambers of the first and second air cells 100a and 100b. In use, the air is drawn into the first air cells 100a from the first air passages 134 to expand the first air cells 100a and to exhaust the air filled in the second air cells 100b. I do. At the same time, air is sucked into the second air cells 100b from the second air passages 134 to expand the respective second air cells 100b,
The operation of evacuating the air filled in a is periodically performed, and the portions to which the user's weight is added are alternately shifted to prevent floor rubbing.

[Problems to be solved by the invention]

As described above, the intake and exhaust valves 105a and 105b provided in the first and second air cells 100a and 100b of the floor rubbing prevention mat 100 are configured as shown in FIG. These intake and exhaust valves 105a, 105b
The air passages 105a 'and 105b' connecting the air passage 132 penetrating the valve body 132 and the air chambers of the first and second air cells 100a and 100b are formed as through holes having a constant inner diameter. First and second air cells 100
When a and 100b individually expand or contract, air passes through.

For example, as shown in FIG. 13, when air is sent from the air passage 134 into the first air cell 100a to expand the first air cell 100a,
From the air passage 134 of the intake / exhaust valve 105a, air is sent into the air chamber of the first air cell 100a through the intake / exhaust passage 105a '. At this time, a strong jet flow is generated from the opening at the inner end of the suction / exhaust passage 105 ', and at the same time, the air generated around the periphery of the opening is drawn by the negative pressure of the jet flow to generate air. The swirling and violent turbulence causes the turbulent air flow in the swirl e <b> 1 to generate an intake sound “hugh”. Note that this intake noise also occurs in the intake / exhaust valve 105a of the second air cell 100a.

On the other hand, when the air in the expanded first air cell 100a is exhausted, as shown in FIG. 14, the air in the air cell 100a enters the intake / exhaust passage 105a 'of the intake / exhaust valve 105a. Since the flow of air is converged and discharged when passing through the entrance opening, air separates into a bubble at the edge within the opening and the vortex e2
Is generated, and the generation of the vortex e2 generates an exhaust sound called “Hugh Hugh”. This exhaust noise also occurs in the intake / exhaust valve 105b of the second air cell 100a.

As described above, the intake sound at the time of intake and the exhaust sound at the time of exhaust are generated by the first and second air cells 100.
The sound is generated each time the a and b are inflated and contracted, so that the sound is harsh to a user, especially a bedridden sick person, and causes stress.

SUMMARY OF THE INVENTION It is an object of the present invention to rationally reduce intake and exhaust sounds of intake and exhaust valves provided on a floor rubbing prevention mat as described above.

[0012]

In order to solve the above-mentioned problems, the present invention provides a mat body by alternately arranging and arranging first air cells and second air cells. Air passages of different systems are individually connected to the second air cells. By performing intake and exhaust through these air passages, the first air cell and the second air cell are alternately expanded and contracted at a predetermined time interval, thereby alternately changing the pressing portion to which the weight of the user is applied. In addition, it is possible to prevent a situation in which a concave pressure is applied only to a part of the user, thereby preventing floor rubbing.

The intake / exhaust valve comprises a substantially tubular valve body, an intermediate portion of the valve body, and a connecting portion for integrally connecting the air chambers of the first and second air cells. In the connection portion, an air passage communicating between the connection ports at both ends of the valve body and an intake / exhaust passage communicating between the air chambers of the first and second air cells are formed so as to penetrate therethrough.

The diameter of the intake / exhaust passage is tapered from the opening at the intake / exhaust passage end to the opening at the air chamber end of the air cell. Therefore, at the time of intake, the air flows from the air passage of the valve body to the first and second air passages through the intake and exhaust passages.
Although the air flow in a state of being ejected into the air chambers of both air cells is generated, the diameter of the air intake / exhaust passage is expanded to increase the diameter of the air cell side opening of the air cell. The flow of air ejected from the part also slows down.
Thereby, the influence of the negative pressure generated by the jet flow blown out from the opening as described above is reduced. As a result, the size of the vortex of the air generated as it is drawn by the negative pressure of the jet flow generated around the opening edge is effectively reduced, and the intake of "Hugh" generated by the turbulent air flow of the vortex part Sound can be reduced.

On the contrary, when the air in the expanded first or second air cell is exhausted, the air in the air cell passes through the intake / exhaust passage of the intake / exhaust valve. At this time, the air in the air chamber enters from the opening on the air chamber side of the intake / exhaust passage, and the air flow converges in the opening. However, since the diameter of the opening is relatively large, the air is The speed at which the light is focused is reduced, and the light is discharged as it is. As a result, the vortex generated when air separates from the bubble at the edge portion in the opening is effectively reduced, and the exhaust sound of “whirl” generated by the generation of the vortex during exhaust can be reduced. In addition, the description of the mat for preventing external rub according to claim 2 will be described together with the embodiment of the present invention.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The floor rubbing prevention mat A shown in FIGS. 1 and 2 is provided with a first air cell 1 and a second air cell 2 which expand into a substantially cylindrical shape on a rectangular spread sheet 5 made of a polyurethane sheet, a PVC sheet, or the like. I do. The first and second air cells 1 and 2 are alternately arranged in the length direction of the spread sheet 5 and arranged in parallel. On the upper surface of the spread sheet 5, two holding belts 4 are arranged in parallel at appropriate intervals in the width direction.
By inserting the first and second air cells 1 and 2 between them, they are held side by side on the spread sheet 5 to form an integral mat body a. At both ends of the spread sheet 5, mounting seat portions 6 used when the apparatus is placed on a bed are extended. Although the first and second air cells 1 and 2 in the present embodiment are formed at both ends in a tapered shape by the above-described sheet portion 6, the first and second air cells used in the present invention have the above-described shape. However, the shape is not limited to this, and may be set to an arbitrary shape. For example, the first and second air cells including the sheet portions at both ends may be formed in a substantially rectangular shape in plan view (not shown).

The two holding belts 4 have a cross section inverted U.
An adhesive portion 4b which is bent in a letter shape and is bent in a substantially inverted T-shape is formed at both ends (FIGS. 5 and 6). The two holding belts 4 are successively fixed on the upper surface of the sheet 5 with the adhesive portion 4b spread thereon at a predetermined interval, that is, at an interval substantially equal to the diameter of the first and second air cells 1 and 2. Thus, the insertion portions 4a of the first and second air cells 1 and 2 formed in a substantially arch shape in side view are arranged side by side on a line (FIGS. 1 and 5). First
The second air cells 1 and 2 are sequentially inserted through the insertion portions 4a of the both holding belts 4 so that the upper surface of the spread sheet 5 is held in an alternately parallel state, thereby holding the mat body a integrally. Constitute.

A surface fastener 6a is provided on the lower surface of one end of the first and second air cells 1 and 2 constructed as described above.
And spread the first and second air cells 1 and 2 on the sheet 5
When it is fixed at the mounting position on the floor, it is detachably engaged with the hook-and-loop fastener 6b stuck to the spread sheet 5 side, and the first and second air cells 1 and 2 are fixed to the fixed position on the spread sheet 5. Removably attached and fixed. The hook-and-loop fastener 6b described above may be replaced with fastening means such as hooks.

As shown in FIG. 5, the first and second air cells 1 and 2 are made by cutting a polyurethane leather into a strip.
It is composed of a plurality of strip-shaped sheets 1a (2a). Further, the two belt-shaped sheets 1a (2a) are overlapped with the resin layer side inward, and the periphery thereof is welded with a high-frequency welder to form an air chamber 1 '(2') which is kept airtight. is there. Both ends of the first and second air cells 1 and 2 are formed in a substantially trapezoidal shape, and an air passage and an air chamber 1 ′ are formed on the lower surface on one end side.
Intake and exhaust valves 51 and 52 communicating with (2 ') are provided. The intake / exhaust valves 51 and 52 connect the first air cell 1 to the first air passage 21 and connect the second air cell 2 to the second air passage 22, and are arranged alternately in the full length direction of the mat body a. The first and second air cells 1 and 2 are attached to the lower surface of one end. The structure of the intake and exhaust valves 51 and 52 will be described later.

The mat body a configured as described above includes:
Two air passages, that is, a first air passage 21 and a second air passage 22 are provided. First and second air passages 2
Reference numerals 1 and 22 are formed of a flexible pipe such as a vinyl pipe, and are connected to the switching valve 70, respectively. The switching valve 70 is connected to an air supply source 60 such as a compressor. If necessary, the air supplied from the air supply source 60 is supplied to the first and second air passages 21 and 22 and the intake / exhaust valve. The air supplied to the first and second air cells 1 and 2 of the mat body a is supplied to the first and second air cells 1 and 2 of the mat body a through the first and second air cells 51 and 52. And the air is separately exhausted through the first, second and second air passages 21 and 22.

As shown in FIG. 1, the first air passage 21
Are arranged in a single shape along one side of the mat body a, connected to each of the intake / exhaust valves 51 at regular intervals, and connected to each of the first air cells 1. Also,
The second air passage 22 is also installed in the same manner as the above-described first air passage 21, and is connected to each of the intake / exhaust valves 52 to be connected to each of the second air cells 2.

The above-described first and second air passages 21 and 22
The switching valve 70 for connecting the base end of the air supply 60 includes a switchable intake valve and an exhaust valve (not shown).
The air supplied from the first air passage 21 and the second air passage 22 is switched and supplied to the first air passage 21 or the second air passage 22.
One of the air cells 1 and 2 is expanded. For example, the switching valve 70 opens the intake valve, sucks air from the intake port 71, and expands the group of the first air cells 1 through the first air passage 21. The switching valve 50 switches an exhaust valve (not shown) in parallel with the switching valve 50, and naturally exhausts the air charged in the second air cell 2 through the air passage 22 from the exhaust port 72. Second air cell 2
Contract the group of.

After a lapse of a predetermined time, for example, about 5 minutes, while maintaining the above state, the switching valve 70 switches the intake valve, takes in air into the group of the second air cells 2 through the air passage 22, and expands. (FIG. 2). In addition, the switching valve 70 switches an exhaust valve (not shown) in parallel with the switching valve 70, and exhausts the air filled in the first air cell 1 through the first air passage 21 from the exhaust port 72. The group of the first air cells 1 is contracted (FIGS. 2 and 9). Thereafter, the above cycle is repeated, and the first air cell 1
And the group of the second air cell 2 are, for example, 5
By alternately inflating and deflating after a period of about a minute, the site where the user's weight is added is alternately shifted to prevent floor rubbing.

The above mat A for preventing floor rubbing
Are intake and exhaust valves 51, 52 for connecting the first and second air passages 21 and 22 with the first and second air cells 1 and 2, respectively.
Is provided. The intake and exhaust valves 51, 52 have exactly the same configuration. That is, both valves have valve bodies 51a and 52a formed in a substantially tubular shape. Valve bodies 51a, 52
a is a connection port 51 for connecting the pipes 13a and 13b forming the first and second air passages 21 and 22 at both ends.
In addition, a straight air passage 21a is provided between the connection ports 51d, and a step is formed on the outer periphery of the connection port 51d to form a shape like a bamboo shoot nipple (FIG. 3).

At the center of the valve bodies 51a, 52a, a connecting portion 51b is integrally formed so as to protrude therefrom. Inside the air passage 21a, the air chambers 1 ', 2 of the first and second air cells 1, 2 are formed. , And an intake / exhaust passage 8 communicating therewith is formed through (FIGS. 3 and 4). An elliptical plate 51c is integrally formed on the protruding end of the connecting portion.
To the strip-shaped sheets 1a, 2 of the first and second air cells 1, 2.
The air intake / exhaust valves 51 and 52 are attached and fixed to predetermined positions of the first and second air cells 1 and 2 while maintaining airtightness by bonding them in a manner sandwiched therebetween.

The intake / exhaust passage 8 is formed so that the diameter of the opening 8b on the air chamber 1 ', 2' side is larger than that of the opening 8a on the air passage 21a side. That is, the intake / exhaust passage 8 is
It is configured to expand in a tapered shape from the opening 8a to the opening 8b having a relatively large diameter, and the shape of the hollow portion is set to be a truncated cone. Incidentally, the intake / exhaust passage 8 of this embodiment has an inner diameter of the opening 8a on the air passage 21a side of 4 mm and an inner diameter of the opening 8b on the air chambers 1 ', 2' side of 6 m.
m, and this setting provided a good noise reduction effect (Table 1). However, the inner diameter of the intake / exhaust passage is limited to the above-described value because a suitable effect can be obtained by making the diameter of the opening on the air chamber side appropriately larger than the diameter of the opening on the air passage side. is not. Table 1 shows the test results of this example.

[Table 1]

Next, the suction / exhaust valves 51, 5 when the floor rubbing prevention mat A constructed as described above is operated.
The relationship between the flow of air passing through the inside 2 and the intake sound and exhaust sound will be described. When air is supplied to the first air passage 21 by the switching operation of the switching valve 70, the air is supplied to the first air passage 21 and the air passage 21 of the intake / exhaust valve 51.
a and the air chamber 1 ′ of the first air cell 1 after passing through the intake / exhaust passage 8.
And the first air cell 1 (air cell group) expands. At the same time, each second air cell 2
Air is discharged from the second air cell 2 and the second air cell 2 group contracts.

At this time, the air supplied from the air supply source 60 passes through the intake / exhaust passage 8 from the air passage 21a of the intake / exhaust valve 51, flows into the inside of the first air cell 1, and flows out. Is generated. As described above, since the diameter of the opening 8b on the air chamber 1 'side of the first air cell 1 is increased, the flow velocity of the air ejected from the opening 8b is also reduced as compared with the case where the diameter of the intake / exhaust passage is constant. (FIG. 7). Thereby, the opening 8b
The influence of the negative pressure generated around is reduced. As a result, the size of the vortex of the air generated by being drawn into the negative pressure of the jet flow generated around the opening 8b is reduced, and the intake sound of “Hugh” generated by the turbulent air flow in the vortex portion is effectively reduced. Can be reduced.

Conversely, when air is supplied to the second air passage 22 by the switching operation of the switching valve 70, this air passes through the second air passage 22, the air passage 22 a of the intake / exhaust valve 52 and the intake / exhaust passage 8. Then, the air is injected into the air chamber 2 'of the second air cell 2, and the second air cell 2 (air cell group) expands. At the same time, each first air cell 1
Air is discharged from the first air cell, and the expanded first air cell 1 group contracts. At this time, when the air in the air chamber 1 ′ of the first air cell 1 enters through the opening 8 b of the intake / exhaust passage 8 on the air chamber 1 ′ side, the flow of air is focused.
As described above, since the diameter is set large, the speed at which air converges is reduced, and the air passes through the intake / exhaust passage as it is and is discharged through the first air passage 21 (FIG. 8). Is that vortices generated when air separates in a bubble shape at the rim portion in the opening 8b are effectively reduced,
The exhaust noise of "hue" generated by the generation of the vortex during exhaust is reduced. In the above-described embodiment, the space in the intake / exhaust passage 8 is formed in a truncated cone shape. However, according to the gist of the present invention, it is essential that the intake / exhaust port is expanded toward the air chamber. The cross section of the exhaust port may be a shape other than a circle, for example, a cross section such as a hexagon or an octagon.

[0030]

As described above, the present invention provides an anti-friction mat according to the present invention comprising a valve body, and a connecting portion for connecting the valve body to the air chambers of the first and second air cells. In the valve body, an air passage is formed so as to penetrate therethrough, and in the communication portion, an intake and exhaust passage communicating between the air passage and the air chambers of the first and second air cells is penetrated. Is tapered from the air passage side end to the air chamber side end of the air cell.

Therefore, when the air is sucked into the first air cell or the second air cell, the flow of the air that flows through the air passage of the valve body and is ejected into the air chamber of the first air cell or the second air cell is generated. As described above, since the intake / exhaust passage is enlarged so as to expand the diameter of the opening on the air chamber side of the air cell, the speed of the air flow ejected from the opening into the fumarole is reduced. Therefore, the effect of the negative pressure generated by the jet flow blowing from the opening is reduced, and as a result, the scale of the air vortex generated to be drawn into the negative pressure of the jet flow generated around the opening edge is effective. And the intake noise of "Hugh" generated by the turbulent air flow in the vortex portion can be effectively reduced.

When the air in the expanded first or second air cell is exhausted, the air in the air cell passes through the intake / exhaust passage of the intake / exhaust valve. When the air flows into the opening, the air flow converges at the opening. However, as described above, since the diameter of the opening on the air chamber side of the intake / exhaust passage is formed to be large, the speed at which air converges in the opening is reduced,
It is discharged as it is. Therefore, the vortex generated when air separates in a bubble shape inside the opening edge is effectively reduced by the convergence of the air flow, and the exhaust sound called “Hugh” generated by the generation of the vortex during the exhaust is effectively reduced. Can be reduced.

In the floor rubbing prevention mat according to the second aspect, the inner diameter of the intake / exhaust passage is changed to a truncated cone shape so as to expand from the air passage side toward the air chamber of the air cell.
Since the shape of the intake and exhaust passages through which the air flows is made smooth, the intake and exhaust flows passing through the intake and exhaust passages can be passed relatively smoothly without unnecessary disturbing. Contributes to reduction of noise and exhaust noise.

[Brief description of the drawings]

FIG. 1 is a plan view showing a floor rubbing prevention mat according to the present invention.

FIG. 2 is a longitudinal sectional view of the mat.

FIG. 3 is a perspective view showing an intake / exhaust valve.

FIG. 4 is a longitudinal sectional view of the intake / exhaust valve.

FIG. 5 is a perspective view showing a state where an air cell of the mat body is disassembled.

6A and 6B are longitudinal sectional views of the mat body, wherein FIG. 6A shows a state where two groups of air cells are inflated, and FIG. 6B shows a state where one group of air cells is inflated.

FIG. 7 is a longitudinal sectional view showing an intake / exhaust valve at the time of intake.

FIG. 8 is a longitudinal sectional view showing an intake / exhaust valve at the time of exhaust.

FIG. 9 is a longitudinal sectional view showing the mat in a gagged state.

FIG. 10 is a plan view showing a conventional floor rubbing prevention mat.

FIG. 11 is a longitudinal sectional view showing the mat in a gagged state.

FIG. 12 is a perspective view showing a conventional intake / exhaust valve.

FIG. 13 is a vertical sectional view showing the intake state of a conventional intake / exhaust valve.

FIG. 14 is a longitudinal sectional view showing an exhaust state of a conventional intake / exhaust valve.

[Explanation of symbols]

 A: floor rubbing prevention mat a: mat body 1 ... first air cell 1 '... air chamber 2 ... second air cell 2' ... air chamber 8 ... intake / exhaust passage 8a ··· Opening (air passage side) 8b ··· Opening (air chamber side) 21 and 22 ··· Air passage 21a ··· Air passage 51 and 52 ··· Intake and exhaust valve 51a ··· valve body 51c ···・ Plate 51b ・ ・ ・ Contact part 51d ・ ・ ・ Connection port

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Akashi 1 Kobe, Yoshida-cho, Haibara-gun, Shizuoka Okamoto F-term in Shizuoka Plant (Reference) BC13 BC14 CA15 DA04 DA05 DA06 DA10

Claims (2)

[Claims] 1. A mat body is formed by arranging first air cells and second air cells that expand into a substantially columnar shape alternately and in parallel, and the first and second air cells are provided with first air of different systems. The first and second air passages are connected via intake and exhaust valves, respectively, and intake and exhaust are performed through the intake and exhaust valves and the first and second air passages.
A floor rubbing prevention mat for alternately expanding and contracting an air cell and a second air cell at a predetermined time interval, wherein the intake and exhaust valves are used to connect an air supply pipe serving as first and second air passages. A substantially tubular valve body provided with connection ports at both ends, an intermediate portion of the valve body, and a communication portion communicating between the air chambers of the first and second air cells. An air passage communicating between the connection ports at both ends is provided, and an intake / exhaust passage communicating between the air passage and the air chambers of the first and second air cells is penetrated in the communication portion. A floor rubbing prevention mat in which the diameter of the intake / exhaust passage is tapered from the opening at the air passage side end to the opening at the air chamber side end of the air cell. 2. The floor rubbing prevention mat according to claim 1, wherein the inside diameter of the intake / exhaust passage is changed into a truncated cone shape.