JP2005095417A - Lightweight bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed which is lightweight so as to be easy to carry and assemble, which is rigid and excellent in design and corrosion resistance, and which can be recycled. <P>SOLUTION: The bed consists of a base frame part, a bed main body head-side frame part, a bed main body leg-side frame part, and a component frame part attached to each frame part. Each frame part consists of Al-Zn-Mg-based alloy extruding material. The bed is divided into three bodies of the base frame part, the bed main body head-side frame part, and the bed main body leg-side frame part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bed that is easy to transport and assemble, has good corrosion resistance and is easy to recycle, and is particularly suitable for a nursing care bed and a medical bed.

  At present, home care beds are mainly used in rentals, and they are transported to users' homes and assembled locally. Therefore, on the assumption that the assembly operator can carry it by hand, the bed main body has a divided structure so that one mouth is 25 kg or less (see, for example, Patent Document 1). Furthermore, a subdivided nursing bed as disclosed in Patent Document 2 has been proposed as a method for facilitating transportation and assembly.

JP-A-8-229078 JP 2001-258953 A

  However, at present, the frame of such a bed is made of iron and has a total weight of nearly 100 kg, so it must be divided finely as in Patent Document 2, which increases the burden on the assembly operator and the transportation cost. There's a problem. That is, since the iron bed is heavy, its frame is divided into three as shown in FIG. 1; a base frame portion 1 that becomes a base, a head side frame portion 2 of the bed main body, and a leg side frame portion 3. Since the main body portion constituting the longitudinal direction is divided into two parts, an additional part such as a coupling device is required, so that the weight is increased. Furthermore, when divided as described above, since the rigidity thereof is lowered, a reinforcing member, a coupling member, and the like are added, so that the weight is increased.

  Furthermore, since iron generally has not very good corrosion resistance, it requires a coating for anticorrosion, which causes high costs. Furthermore, iron home care beds are not recyclable and are currently treated as industrial waste after use, which may cause environmental problems in terms of resource and energy savings.

  An object of the present invention is to provide a recyclable bed that is light in weight, has high rigidity, and has high design properties.

  The invention according to claim 1 is a bed composed of a base frame portion, a bed main body head side frame portion, a bed main body leg side frame portion, and a component frame portion attached to each frame portion. Is a lightweight bed characterized by being made of an Al—Zn—Mg alloy extruded material and being divided into three bodies: a base frame part, a bed main body head side frame part, and a bed main body leg side frame part.

  According to a second aspect of the present invention, there is provided a bed including a base frame portion, a bed main body head side frame portion, a bed main body leg side frame portion, and a component frame portion attached to each of the frame portions. The light weight bed is characterized in that the frame part and the bed main body leg side frame part constitute an integral frame part.

  According to a third aspect of the present invention, in the lightweight bed according to the first or second aspect, the non-movable frame portion and the non-removable frame portion of the component frame portion attached to the base frame portion are joined to the base frame portion by welding. The non-movable frame part and the non-removable frame part in the part frame part attached to the bed main body side frame part are joined to the bed main body head side frame part by welding, and the main body leg side A lightweight bed characterized in that a non-movable frame portion and a non-removable frame portion in a component frame portion attached to the frame portion are joined to the bed main body leg side frame portion by welding.

  Since the lightweight bed according to the present invention is lightweight, the number of divisions can be reduced and the number of packaging can be reduced. In addition, the burden on the assembly operator can be reduced. Furthermore, it is easy to recycle and is excellent from the viewpoint of environmental problems. Therefore, there is an industrially remarkable effect.

Hereinafter, embodiments of the present invention will be described.
In general, a bed equipped with an iron floor raising, back raising, and knee raising mechanism is usually a base frame portion 1 that becomes a base, a head side frame portion 2 of the bed main body, and a leg side frame portion 3 of the bed main body as shown in FIG. It is divided into three.

According to the bed of the present invention, each frame portion is formed of an aluminum alloy extruded material, thereby reducing weight and improving corrosion resistance and allowing easy recycling.
The weight reduction not only reduces the burden on the assembly worker, but also makes it possible to integrate what was heavy and divided in the iron bed by reducing the weight, reducing the number of divisions, and transporting. make it easier.
In bed recycling, aluminum is known to be more recyclable than iron bed, which was industrial waste, and it can be seen that recycling is easy. In addition, disinfection and sterilization of beds used for home care and medical treatment are essential even when they are discarded. However, since aluminum dissolves and regenerates, there is an advantage that more advanced disinfection and sterilization can be performed at the same time. is there.
Furthermore, since the corrosion resistance is improved by using aluminum, it is not necessary to apply a strict anticorrosion coating such as an iron bed.

In addition, when the bed frame is made of an aluminum alloy extruded material, a simple and functional structure can be obtained relatively easily and the design is excellent.
The aluminum alloy extruded material has the advantage that the cross-sectional shape has a high degree of freedom in design, and members of various cross-sectional shapes can be manufactured. As shown in FIG. It is easy to form 5 into a curved shape with an aluminum alloy extruded material, and it can be formed simply by extruding with its cross-sectional shape, and secondary processing is unnecessary.

In addition, the use of an aluminum alloy extruded material promotes the integration of the frame, thereby reducing the weight and increasing the rigidity.
That is, since the head side frame part 2 and the leg side frame part 3 are heavy in weight, they have conventionally been divided, but can be made light by making an aluminum alloy, and the bed body shown in FIG. Like the frame part 4, the head side frame part and leg side frame part of the bed body can be integrated, thereby eliminating the need for reinforcing members and connecting members required when adopting a split structure, and reducing weight. And the number of packaging can be reduced, and the transportation cost is reduced.
In order to make the bed more rigid, it is preferable to use a high-strength alloy and to join the non-movable frame part and the non-removable frame part by welding.
When a high strength alloy is used, high rigidity can be achieved, and further weight reduction can be expected by thinning the member. Moreover, a simple and highly rigid structure can be obtained by welding.

  By the way, as for joining methods other than welding, mechanical joining methods such as bolt tightening, rivet joining, and mechanical caulking can be considered, but processing such as increase in the number of parts such as bolts, deterioration of assemblability, drilling and notch cutting, etc. This is not preferable because a problem due to an increase in the size of the material causes a cost increase and a weight increase. However, depending on the type of aluminum alloy, since the strength of the joint portion is reduced by welding due to the effect of heat, an alloy of high strength and a small strength reduction due to welding is selected as the material of the aluminum alloy.

Generally, there are three types of aluminum alloys used for the structure: non-heat-treatable Al—Mg-based alloys, heat-treated Al—Mg—Si-based alloys, and Al—Zn—Mg-based alloys.
A non-heat-treatable Al-Mg alloy has a small decrease in strength even if it is affected by the heat of welding, but it is difficult to manufacture a hollow shape material, and the shape is limited and the degree of freedom in design is significantly reduced. Not suitable for. The heat-treatable Al—Mg—Si-based alloy is affected by the heat effect of welding and the base material becomes dull and the strength is significantly reduced. After that, when quenching and tempering treatment is performed, the same strength as the base material is obtained. In order to heat-treat a relatively large object such as a bed, a large heat-treatment furnace is required, and it is practically difficult when considering mass production. On the other hand, the Al—Zn—Mg based alloy has higher strength than the above two types of alloys, and the strength decreases after welding, similar to the same heat treatment type Al—Mg—Si based alloy. The strength gradually recovers by natural age hardening, and after one month, the strength recovers to near the strength of the base material.

  Therefore, the weldability of the above three types of aluminum alloys was determined from the strength of the butt weld joint obtained by a tensile test. Table 1 shows the test conditions and Table 2 shows the test results.

As is apparent from Table 2, the Al—Zn—Mg alloy 7N01-T5 has a smaller strength reduction after welding and the strength is lower than the Al—Mg—Si alloy 6N01-T5 of the same heat treatment type alloy. I understand that it is expensive.
Therefore, when manufacturing a lightweight bed, it is preferable to use an Al—Zn—Mg-based alloy because a bed with good weight reduction, corrosion resistance, and recyclability can be manufactured.
In addition, although the Example of this invention was shown about the bed for home care, application of this invention is applicable to not only the limitation but the bed in general.

The bed frame divided into the base frame part, the head side frame part of the bed body and the leg side frame part. A bed main body frame in which the head side frame portion and leg side frame portion of the bed main body according to the present invention are integrated. Example of frame shape by aluminum extrusion

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base frame part 2 Head side frame part of bed main body 3 Leg side frame part of bed main body 4 Parts frame part 5 Integrated bed main body frame part 6 Curved surface

Claims (3)

In a bed composed of a base frame part, a bed main body head side frame part, a bed main body leg side frame part, and a component frame part attached to each frame part, each frame part is an Al-Zn-Mg alloy. A lightweight bed comprising an extruded material and divided into a base frame part, a bed body head side frame part, and a bed body leg side frame part. In a bed composed of a base frame part, a bed main body head side frame part, a bed main body leg side frame part, and a component frame part attached to each frame part, the bed main body head side frame part and the bed main body leg side frame A lightweight bed characterized in that the portion constitutes an integral frame portion. The lightweight bed according to claim 1 or 2, wherein a non-movable frame portion and a non-removable frame portion in a component frame portion attached to the base frame portion are joined to the base frame portion by welding, and the bed main body. The non-movable frame portion and the non-removable frame portion in the component frame portion attached to the head side frame portion are joined to the bed main body head side frame portion by welding, and the component frame portion attached to the main body leg side frame portion A non-movable frame portion and a non-removable frame portion are joined to the bed main body leg side frame portion by welding.

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