JPH11244168A - Shutter type bathtub cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain lightening in weight by reducing the thickness by more than a specified % by increasing the height in spite of having a flexure value almost equal to that of a conventional shutter type bathtub cover. SOLUTION: This bathtub cover is formed into a band-shaped molding having any arbitrary length by repeatedly mutually welding soft band-shaped pieces 3 for connection at the terminal parts in the longitudinal direction of the band- shaped molding molded by simultaneously extruding slender hollow rod-shaped members 1 made of rigid synthetic resins and the band-shaped pieces 3 for connection made of soft synthetic resins for mutually connecting these members 1. In this case, the rigid slender hollow rod-shaped member 1 is formed to have the height of about 15 mm higher than conventional one by more than 10% and the thickness of about 0.7 mm which is thinner than conventional one by more than 20%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated hollow formed of a polypropylene-based resin or an ABS-based resin which is placed on the upper surface of a large bathtub to prevent steam in the bathtub from being diffused or the temperature of the hot water to be reduced. The present invention relates to a shutter type bathtub lid having an arbitrary length formed by repeating welding of soft connecting strips at longitudinal ends of a soft strip extruded simultaneously with a rod-shaped member.

[0002]

2. Description of the Related Art Conventionally, an elongated hollow rod-shaped member of a bathtub lid has
It is made of ABS or polypropylene resin. This bathtub lid usually has a thickness of 0.9 mm and a width of 2 mm.
Some have a size of 8.5 mm and a height of 13.5 mm.

[0003]

However, the conventional shutter-type bathtub lid has a large wall thickness, so that the weight is heavy, so that the required amount of raw materials is increased and the material cost is increased. In addition, there is a drawback that the bathtub lid is difficult to handle because it is heavy.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an industrially advantageous shutter-type bathtub lid capable of reducing the required amount of material while having the same deflection value. is there.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following technical means. The invention according to claim 1 is characterized in that an elongated hollow rod-shaped member made of a hard synthetic resin and a connecting strip made of a soft synthetic resin for connecting these members are simultaneously extruded and formed at a longitudinal end of a strip-shaped molded product. In a shutter-type bathtub lid formed by repeatedly welding certain soft connection strips to form a strip having an arbitrary length, the height of the hard elongated hollow rod-shaped member is set to 1 in the conventional art.
The thickness is about 15 mm, which is relatively high, and the wall thickness is about 0.2 mm, which is about 20% thinner than the conventional one.
The technical means of forming to 7 mm was adopted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an elongated hollow rod-shaped member 1 of the present invention and a flexible synthetic resin connecting strip 3 for connecting these members. It is sectional drawing which shows embodiment which superposed high frequency dielectric heating, and heat-welded and connected. The elongated hollow bar-shaped member 1 has rib pieces 2 for reinforcement in the height direction formed at substantially the same time at the center.

[0007] The present invention relates to a retractable shutter-type bathtub lid in which a number of elongated hollow rod-shaped members 1 made of hard synthetic resin are connected via connecting strips 3 made of soft synthetic resin.

According to the present invention, when the elongated hollow member 1 is made of polypropylene, the connecting strip 3 is made of ethylene / vinyl acetate copolymer (EVA), ethylene / ethyl acrylate (EEA) or a mixture thereof. When using ABS for the member 1, use PVC, polyester, or urethane elastomer for the connecting strip 3,
Each is simultaneously extruded and heat-welded by high-frequency heating or the like. The strips 3 simultaneously formed at both ends in the longitudinal direction of the elongated hollow rod-shaped member 1 are repeatedly welded under pressure by high-frequency dielectric heating to form an arbitrary length to form a shutter-type bathtub lid. . The present invention is also applicable to the case where polypropylene is used for the elongated hollow member 1 and the connecting strip 3 is made of soft polypropylene which is softened by adding a modifier to polypropylene.

Here, the point that the shutter type bathtub lid of the present invention is superior to the conventional shutter type bathtub lid will be described. The formula for calculating the second moment of area I is I = 1 /
12 × (AD3−BC3) (see FIG. 1). As can be understood from this formula, the height (D, C) can be raised to the third power.

That is, taking advantage of the fact that the height is slightly increased, for example, the height is increased by about 10% from 13.5 mm to 15 mm, and the thickness is reduced by about 20% from 0.9 mm to 0 mm. In the case of 0.7 mm, the deflection value is approximately equal when the amount of deflection is calculated by approximating the second moment of area by the above equation. When the weight was calculated under these conditions, the thickness could be reduced, so that the conventional height of 13.5 mm and thickness of 0.9 mm were obtained.
Is about 340 g / m, the height of the present invention is 15
mm and a thickness of 0.7 mm, it is approximately 300 g / m. Thus, the weight per meter can be reduced by about 12%.

[0011]

According to the present invention, the following effects can be obtained based on the above configuration. (1) The shutter type bathtub lid according to the present invention is light in weight and convenient to handle. (2) Despite having a deflection value substantially equal to the deflection value of the conventional shutter-type bathtub lid, by increasing the height by approximately 10%, the wall thickness can be reduced by 20%, and as a result, the weight can be reduced. It can be 12% lighter.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shutter-type bathtub cover according to an embodiment of the present invention.

[Explanation of symbols]

1 ···· Elongated hollow rod-shaped member 2 ··· Reinforcing rib piece 3 ···

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[Procedure amendment]

[Submission date] November 10, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 1]

Claims (1)

[Claims] 1. An elongated hollow rod-shaped member made of a hard synthetic resin,
Repeated welding of the soft connecting strips at the longitudinal ends of the strip formed by simultaneously extruding the soft synthetic resin connecting strips connecting these to each other to form a strip of any length. In the shutter-type bathtub lid formed into a molded product, the height of the hard elongated hollow rod-shaped member is increased to about 15 mm, which is more than 10% higher than the conventional one, and the thickness is about 0.7 m, which is about 20% thinner than the conventional one.
m, a shutter-type bathtub lid.