JPH06193422A - Manufacture of resin made oil level gauge - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of an oil level gauge suitable for production of various kinds of oil level gauges, of which the shaft parts are different from each other in length, possible to minimize the number of metal molds, easy to maintain and control and possible to manufacture at a low cost. CONSTITUTION:A cover part 1 furnished with a grip part 2 on its outside surface side and a screw part 3 on its inside surface side and a shaft part 4 the section of which is sequare are integrally moulded of a heat resistant synthetic resin material by injection molding. By a press machine, the head end side of the shaft part 4 is cut in accordance with length of an oil level gauge 10, and simultaneously, a scale 6 for measurement of oil level is stamped on the head end part of the cut shaft part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an oil level gauge for measuring the oil level of general-purpose engine oil used as a drive source for mowers and generators, and oil for automobile missions. (Also referred to as an oil level gauge).

[0002]

2. Description of the Related Art As shown in FIG. 2, an oil level gauge 10 of this type comprises a lid portion 1 provided with a screw portion 3 and a grip portion 2 and a shaft portion 4, and a tip portion of the shaft portion 4 has a tip portion. In general, the scale 6 for measuring the oil level is formed. The material used for the oil level gauge 10 may be one that is entirely made of heat-resistant synthetic resin, or one that is made of synthetic resin for the lid portion 1 and is made of metal such as steel for the shaft portion 4.

By the way, the conventional manufacturing method of the oil level gauge includes: a. If the whole is made of resin: i) Although not shown, a method of integrally molding the entire gauge including a scale for measuring the oil level by injection molding, and ii) screw part 3 as shown in FIG. A lid portion 1 having a grip portion 2 and a shaft portion 4 are separately formed, and a proximal end large-diameter portion 4a of the shaft portion 4 is inserted into a hole 20 for connection provided in the lid portion 1 for adhesion. There is a method of bonding with an agent. Also, b. When the shaft part is made of metal: iii) As shown in FIG. 5, the metal round bar 21 is cut into a predetermined length (FIG. 5 (a)). At the base end of the round bar 21, 2
The groove 22 of the strip is processed (FIG. 5 (b)). The tip end side of the round bar 21 is pressed and flattened, and at the same time, a scale 23 for measuring the oil level is engraved (FIG. 5 (c)). In a state where the base end portion (groove 22 processed portion) of the round bar 21 is inserted into a mold (not shown), a lid portion 1 having a screw portion 3 and a grip portion 2 is formed by a synthetic resin, and integrated. There is a method of converting (FIG. 5 (d)).

[0004] As a prior art, Jpn.
There is a level gauge described in Japanese Patent No. 516.

[0005]

However, the above conventional manufacturing method has the following disadvantages.
The method of i) above uses a metal mold for resin molding even when manufacturing oil level gauges that have a common grip part and differ only in the length of the shaft part, in other words, the position of the scale for measuring the oil level. You will need it. Therefore, it is necessary to replace the mold every time the position of the scale changes, which complicates the work and also requires that many kinds of molds be stored until the end of the spare parts, and the maintenance Management is difficult. In particular, recently, there is a tendency to produce various kinds in small quantities, which is difficult to deal with.

In the above method ii), the temperature of engine oil usually rises to 100 ° C. or higher, but there are few adhesives whose adhesive strength is maintained even in such a high temperature environment.
In addition, the material of the synthetic resin that can be used in connection with the adhesive is limited, and in addition, there is a risk of defective adhesion and the shaft portion coming off the lid portion.

In the method iii), it takes a lot of time to manufacture the shaft portion and the manufacturing cost becomes high.

The present invention has been made in view of the above points, and is suitable for the production of various types of oil level gauges with a small amount of shaft portions having different lengths, and the number of molds can be minimized.
It is an object of the present invention to provide a method for manufacturing an oil level gauge that can be easily maintained and managed at low cost.

[0009]

In order to achieve the above object, the manufacturing method of the present invention comprises: (a) a lid portion having a screw portion and a grip portion, and a shaft portion, which are made of a heat-resistant synthetic resin material. The length of the shaft portion is adjusted by integrally molding and (b) cutting the tip side of the shaft portion as needed, and a scale for measuring the oil level is pressed at the tip of the shaft portion by a press machine. Alternatively, it is stamped with a hot stamping machine.

When the scale is marked by a hot stamping machine, it is possible to color the scale portion with a color different from the material of the shaft portion.

[0011]

According to the manufacturing method of the present invention having the above-mentioned structure, the shaft portion does not come off from the lid portion due to the component (a), and the work of integrating both portions with an adhesive or the like becomes unnecessary. In addition, the type of synthetic resin is not limited in relation to the adhesive. When the length of the shaft part is set to the longest one among the multiple types of oil level gauges with different lengths at the time of molding by the component (b), the length of the shaft part of the oil level gauge to be manufactured is set. The length of the shaft part can be adjusted by cutting a part (unnecessary part) in accordance with the above, and at the same time or subsequently to this, a scale for measuring the oil level is engraved on the tip part of the shaft part. Set up. Therefore, it is possible to manufacture a plurality of types of oil level gauges having different shaft lengths by using a common mold.

Further, according to the manufacturing method of the second aspect, since the scale portion is colored with a color different from that of the shaft portion, the oil adhesion position can be clearly discriminated and the oil level (oil level) can be measured. It will be easier. In particular, a yellow cloth is often used for a resin oil level gauge for a general-purpose engine, and it may be difficult to distinguish it from oil in the related art, but such disadvantages are improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for manufacturing an oil level gauge according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view sequentially showing a manufacturing method according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an oil level gauge manufactured by the manufacturing method of the present invention.

First, as shown in FIG. 1A, a lid portion 1 having a grip portion 2 on the outer surface side and a screw portion 3 on the inner surface side,
An oil gauge material 5 is manufactured by integrally molding a shaft portion 4 having a rectangular cross section with a heat-resistant synthetic resin material by injection molding using a mold (not shown). The oil level gauge material 5 has a solid structure as a whole, and the length of the shaft portion 4 is adjusted to the longest one of a plurality of types of oil level gauges 10 (FIG. 2) having different lengths. For heat resistant synthetic resin material,
Nylon (polyamide resin), nylon mixed with glass fiber, phenol resin, or other resin is used. Further, the oil level gauge material 5 is usually colored yellow so that the oil injection position can be easily determined.

A large amount of the above-mentioned oil level gauge material 5 is manufactured in advance, and the tip side of the shaft portion 4 is cut by a press (not shown) according to the length of the oil level gauge 10 (FIG. 2). At the same time, the scale 6 for measuring the oil level is engraved with the cut shaft portion 4 having a slightly flat tip (FIG. 1 (b)). The flattening and marking of the scale 6 are usually performed by cold pressing. Also, the tip portion of the shaft portion 4 is flattened, the cutting is performed for adjusting the length,
The order of the three steps of and the marking of the scale 6 is not particularly limited, and for example, a method of simultaneously performing the step of, the step of simultaneously performing the step of, and the step of the subsequent step of There is.
The scale 6 includes a high level H and a low level L as shown in FIG. 1 (b), and also includes an uneven surface (gauge surface) that alternately inclines in an oblique direction between both levels. Oil is applied to this uneven surface. Attach it. In this way, the oil level gauge 1 shown in FIG.
No. 0 is manufactured, but the structure of the oil level gauge 10 itself is conventionally known.

FIG. 3 is a perspective view sequentially showing a manufacturing method according to another embodiment of the present invention. FIG. 3 (a) is common to FIG. 1 (a), and the oil level gauge material 5 is manufactured by the same method as in the above embodiment. Subsequently, as shown in FIG. 3B, the tip side of the shaft portion 4 is cut in accordance with the length of the oil level gauge 10 (FIG. 2).

Next, a scale 6 is engraved on the tip of the cut shaft portion 4 by a hot stamping machine (not shown), and a color different from the material color (yellow) of the shaft portion 4 distinguishes it from oil. An easy color (for example, gray) is colored (FIG. 3 (c)). The marking and coloring of the scale 6
The heating is performed at about the deformation temperature of the resin while simultaneously applying pressure. In this way, the oil level gauge 11 in which the scale 6 is colored with a color different from that of the shaft portion 4 is manufactured.

[0019]

As is apparent from the above description,
The oil level gauge manufacturing method according to the present invention has the following effects.

(1) After molding various types of oil level gauges having a common lid portion and different shaft portion lengths by using a common mold, the length of the shaft portion is adjusted and a scale is marked. Since it can be easily manufactured, the number and type of molds can be minimized, and the maintenance and management thereof is easy.

(2) Suitable for small-lot production of various types and can be manufactured at low cost.

(3) In the manufacturing method according to the second aspect, since the scale portion can be colored with a color different from that of the shaft portion, the oil adhesion position can be easily determined when measuring the oil level, which is convenient.

[Brief description of drawings]

FIG. 1A and FIG. 1B are perspective views sequentially showing a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an oil level gauge manufactured by a manufacturing method of the present invention.

3 (a) to 3 (c) are perspective views sequentially showing a manufacturing method according to another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional oil level gauge, showing a state before the shaft portion is bonded to the lid portion.

5 (a) to 5 (d) are perspective views sequentially showing a method of manufacturing a conventional oil level gauge.

[Explanation of symbols]

 1 Lid part 2 Grasping part 3 Screw part 4 Shaft part 5 Gauge material 6 Scale 10/11 Oil level gauge

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[Procedure amendment]

[Submission date] July 31, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 4]

[Figure 3]

[Figure 5]

Claims (2)

[Claims] 1. A lid portion having a screw portion and a grip portion,
The shaft part and the shaft part are integrally molded with a heat-resistant synthetic resin material, and the length of the shaft part is adjusted by cutting the tip side of the shaft part as necessary, and at the end of the shaft part, an oil surface is formed. A method for producing a resin-made oil level gauge, which comprises engraving a scale for level measurement with a press or a hot stamping machine. 2. The method for producing a resin oil level gauge according to claim 1, wherein when marking the scale with a hot stamping machine, a color different from the material of the shaft portion is colored at the scale portion.