JPS6147526A - Housing of digital clinical thermometer and its preparation - Google Patents

Abstract

PURPOSE:To perfectly prevent alcohol from penetrating into a clinical thermometer, by engaging a transparent window panel with the temp. display window opening of an outer shell from the interior of said shell to mold the same outside a partial inner shell. CONSTITUTION:A housing 1 after the completion of molding consists of an outer shell 2 and a partial inner shell 4, which is provided with the transparent window panel 3 engaged with the temp. display window opening 2' of the outer shell 2 from the interior of said outer shell 1 so as to be capable of seeing said window panel 3 only from the outside. The transparent window panel 3 is protruded so as to be thickened from the surface of one flat surface. For example, the partial inner shell 4 is primarily molded from a butadiene/styrene resin and engaged with the core 6, which is inserted in the cavity of a mold 5 for molding a housing 1, to be inserted in the cavity and, after molding, the outer shell 2 is molded from an appropriate resin contracted with cooling, for example, polyphenylene oxide (PPO). In such a state that the core 6 engaged with the partial inner shell 4 is inserted in the mold 5, the molten resin for molding the outer shell 2 is injected from a gate 7 to fill the space 8 generated between the partial inner shell 4, core 6 and the inner surface of the mold 5 and cooled to mold the outer shell 2.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a housing for a digital thermometer and a method for manufacturing the same.

<Prior art> The housing of a digital thermometer is a flat cylinder with one end open and the other end transformed into a thin cylinder in order to attach the thermometer t-1ffl. It has a temperature display window (7) through which a digital temperature display section using a liquid crystal device is fixed.

<Problems to be Solved by the Invention> Conventionally, the housing that is located inside the temperature display window opening and the see-through window sheet metal that fits into the window opening are each molded separately using plastic, and the housing is directly fitted from the outside into the entire window opening of the window plate. Alternatively, an O-ring is fitted around the outer periphery of the window plate and fitted into the window opening from the outside, and the outer periphery of the window plate and the inner periphery of the window opening are fixed with adhesive. However, this
In addition to being time-consuming, when the product is immersed in alcohol for disinfection, the alcohol penetrates between the window plate and the window opening and damages the electronic circuit inside the thermometer, making it unusable. It will stop happening.

Means for Solving the Problems> Therefore, the present invention provides an outer shell having a temperature display window opening as a housing of a thermometer, and a see-through window plate 41 that fits into the temperature display window opening of the outer shell from the inside of the outer shell. It is characterized in that it is composed of a cylindrical partial inner shell that protrudes from the surface, and the outer shell is molded outside the partial inner shell so as to fit into the transparent window sheet metal temperature display window opening from the inside. As for the manufacturing method, a cylindrical partial inner shell that covers the entire transparent window plate protruding from the second side is molded, and this partial inner shell is housed in a thermometer 7/Using molding, and the transparent window plate is used to display the temperature of the mold. It fits into the window opening forming part, and then a plastic that shrinks as it cools is injected into the mold to form an outer shell having a temperature display window opening outside the partial inner shell, and the plastic that shrinks as the outer shell shrinks as it cools. It is characterized in that the inner shell is secured by tightening the entire circumference of the partial inner shell, and the see-through window plate is tightened from the circumference around the inner circumference of the temperature display window opening to form a seal.

According to the present invention, an outer shell is formed on the outside of a partial inner shell having a transparent window plate protruding from the surface, and the transparent window plate is inserted into the temperature display window opening provided in the outer shell from inside the outer shell. It is fitted.

<Example> In the drawings, l is a molded housing, which has an outer shell K, a temperature chart of the outer shell λ, and a see-through window plate 3 fitted into the display window opening loco' from the inside of the outer shell. , and a partial inner shell μ from which only the window plate 3 can be seen from the outside. The term "partial inner shell" refers to the fact that the inner shell is not entirely different from the outer shell.

The inner part of the shell may have a cylindrical shape as a whole, or, as shown in Figure 2, it may have a step-like cut in each of the oppositely facing flat surfaces and scratches, and the cylindrical part μ′ is only partially present. The transparent window plate 3 is often thickened and protrudes from one flat surface.

In the present invention, the inner shell of this part ≠ the entire body is formed by primary molding, for example, of butadiene-styrene resin, and the gold to be molded is formed! This part of the inner shell 'f is inserted into the core 6 into the cavity of
A suitable resin, such as polyphenylene oxide (ppo
: The outer shell λ is molded at a shrinkage rate of about o, jqb per unit length. Figure 3.4 shows the state in which the core 6 fitted with the inner shell is inserted into the mold j. Molten resin for molding the outer shell is injected from the gate 7, and the inner shell and the core 6 are inserted into the mold j. and mold j
The space tK created between the inner surfaces of the shell is filled with molten resin, and the outer shell is formed after the resin has cooled.

In this case, the surface of the transparent window plate 3 protruding from the surface of the partial inner shell is as shown in the enlarged view in FIG. The small protrusion j' is brought into close contact with the resin to prevent the resin for molding the outer shell from entering between them, and when molded, the 5th.
As shown in Figure 6, the surface periphery 3' of the transparent window plate and its protruding portion b' from the inner shell are covered and surrounded with a resin for molding the outer shell, and a temperature display window opening x/ Form all at the same time. As mentioned above, the resin for molding the outer shell contracts as it cools, so the shrinkage causes the inner shell of the υ part to be tightened from the complete rotation υ, and the inner shell to be tightly fixed, as well as to protrude from the surface of the inner shell of the transparent window plate. Tighten the area around it to ensure a secure seal.

In addition, when molding the entire outer shell, immediately after molding, set the temperature at an appropriate temperature, for example, around 100°F (about 100°F), and insert the inner shell into the mold with the inner shell as the core. The flow of the outer shell molding resin inside is improved, and at the same time it blends in with the surface of the partial inner shell, increasing the adhesion effect between the partial inner shell and the outer shell molded thereon.

Effect> As is clear from the above, the 7-Using of the present invention has a reliable seal between the temperature display window opening and the transparent window plate that closes the opening, so even if it is immersed in an alcohol solution, the This completely prevents alcohol from entering the inside of the thermometer.

Furthermore, during manufacturing, the partial inner shell and outer shell are molded individually, but since the outer shell is molded on top of the partial inner shell, it is necessary to fix the transparent window plate later by fitting it into the temperature display window opening of the outer shell. It takes a lot of time and effort, and it is possible to produce products with high efficiency with a reliable seal between the temperature display window opening and the transparent window plate.

[Brief explanation of drawings]

Fig. 7 is a perspective view of the housing of the digital thermometer according to the present invention, Fig. 2 is a perspective view of the partial inner shell, and Fig. 3 is a longitudinal section of the core and the partial inner shell inserted into the outer shell molding chamber. figure,
FIG. 4 is a cross-sectional view of the same as above, FIG. 5 is an enlarged longitudinal sectional side view of the main part of the molded housing, and FIG. 6 is an enlarged longitudinal sectional front view of the molded housing. ′ is the temperature display window opening, 3 is the transparent window plate, ≠ is the partial inner shell, j is the gold search,
B indicates the core.

Claims (2)

[Claims] (1) In the housing of a digital thermometer equipped with a transparent temperature display window, an outer shell having a temperature display window opening, and a transparent window plate that fits into the temperature display window opening of the outer shell from inside the outer shell. A digital thermometer comprising a cylindrical partial inner shell protruding from the surface, and the outer shell is molded outside the partial inner shell by fitting a see-through window plate into a temperature display window opening from the inside. housing. (2) A cylindrical partial inner shell having a transparent window plate protruding from the surface is first molded, and this partial inner shell is housed in the mold of the thermometer housing, and the transparent window plate is placed inside the temperature display window opening forming part of the mold. Then, a plastic that shrinks as it cools is injected into the mold to form an outer shell with a temperature display window opening outside the inner shell, and the shrinkage of the outer shell as it cools causes the inner shell to move around the inner shell. A method for manufacturing a housing for a digital thermometer, characterized in that both shells are secured together by tightening, and a see-through window plate is tightened around the inner periphery of a temperature display window opening for sealing.