JPS5831796Y2 - filler cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a filler cap used for a fuel container such as an automobile fuel tank.

Conventionally, as shown in FIG. 1A, the cap as described above has its lower part locked in a locking part 1a formed by bending the upper end of a mouth cylinder 1 made of a pipe of a fuel container into an inverted U-shape. A cap body 2 is formed with a locking portion 2a that protrudes toward the center so as to appear, and a disc-shaped retainer 3 is supported within the cap body 2 by a shaft (not shown) so as to be rotatable relative to the cap body 2. and a backing 4 made of an elastic material and having a sealing part 4a into which the outer peripheral part 3a of the retainer 3 is fitted and pressed onto the mouth cylinder 1.

This filler cap has a notch in which the locking part 2a of the cap body 2 is loosely inserted into the locking part 1a of the mouth cylinder 1, and a locking part 1a of the mouth cylinder 1 in the locking part 2a of the cap body 2. A notch to be loosely inserted is provided in a part of the circumference, and the cap body 2 is placed over the mouth cylinder 1 and rotated with both the locking parts 1a and 2a aligned with the other notch. By this,
Attachment and removal operations are carried out by locking both the locking parts 1a and 2a, and releasing the locking of the locking parts 1a and 2a by an operation opposite to the above-mentioned operation.

However, since the contact area between the cap body 2 and the retainer 3 is large, a large operating force is required to rotate the cap body 2 when attaching and detaching the filler cap.
Since the backing 4 swells when it comes into contact with or is immersed in fuel such as gasoline, the diameter of the backing 4 increases as shown from the solid line to the chain line in Figure 1, in the radial direction where the backing 4 and retainer 3 fit together. There was a problem that the dimensions became smaller and the fitting between the two became disconnected.

The present invention is an attempt to solve the above-mentioned problems of the conventional ones, by providing a protrusion that protrudes upward on the retainer, and making the metal contact with the cap body over a small area by the protrusion. In addition, the rotational operating force of the cap body is small, making it easy to attach and detach, and the thickness of the center side of the backing is made thinner than the sealing part, so that even if the backing swells with fuel, its outer periphery will be reduced. The purpose of the present invention is to provide a filler cap in which the diameter of the filler cap is not increased and the backing is prevented from coming off the retainer.

Incidentally, as an example of a backing having a thinner central portion, the one described in Japanese Utility Model Application Publication No. 59-3126 is known.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In FIG. 2, reference numeral 3 denotes a retainer made of a metal plate, and this retainer 3 has an annular and truncated conical projection 13b projecting upward.

3c is provided, and the retainer 3 is
contacts the cap body 2, and the contact area between them is reduced.

In addition, the backing 4 has an outer peripheral portion (a seal portion 4a formed therein).
The thickness of the part closer to the center is made thinner, and a gap is formed between this thinner part 4b and the IJ j-su 3, and a seal part 4a is formed below the thinner part 4b. so that it protrudes, and the backing 4 is swollen by the fuel and 1
In case of bumps, reduce the thickness as shown by the chain line in Figure 2.
Although this portion 4b is deformed, the depth of fit between the seal portion 4a and the outer peripheral portion 3a of the retainer 3, that is, the fit dimension in the radial direction is not changed.

In addition, in this example, the configuration other than those described above and the operation of attaching and detaching the cap are the same as those shown in Part 1A, so the same components are given the same reference numerals as in Figure 1 in Figure 2. The explanation will be omitted.

Further, FIG. 3 shows another embodiment of the present invention.

In this embodiment, there is only one truncated conical protrusion 3d in contact with the cap body 2 of the retainer 3, and the thinner part 4b (7) of the backing 4 has an annular shape on the outer periphery. By forming the folds 4c, the elongation in the radial direction when the backing 4 swells is absorbed by the folds 4C.
It is only different from the one in Figure 2.

In this embodiment, the pleats may be provided at multiple locations in the radial direction of the backing 4.

In addition, in this invention, a key provided in the retainer 3! 7:
The protrusion that comes into contact with the pump body 1 is 1. If the instep area can be reduced, 1. =, e j, The shape and number can be changed as appropriate, without being limited to the m-shape or the truncated cone shape, such as one that makes point contact at multiple locations in the circumferential direction.

As explained above, in the filler cap of the present invention, the retainer is provided with an upwardly protruding protrusion that makes contact with the cap body, and the contact area of these parts is reduced, so that the rotational operation force of the cap body is reduced when attaching and detaching the cap. Small size 2
．． The first bullet landing operation is facilitated, and since the thickness of the part of the backing closer to the center than the seal part is made thinner, even if the backing swells with fuel, it is possible to prevent the outer peripheral part from expanding in the radial direction. However, the fit between the backing and the retainer does not come off or become unstable, and the backing can be reliably crimped onto the mouth of the fuel container, resulting in good fuel sealing performance. effective.

[Brief explanation of drawings]

Fig. 1a is a partial vertical sectional view showing a conventional filler cap; Fig. 3 is a partial vertical cross-sectional view showing a filler cap, and Fig. 3 is a partial vertical cross-sectional view showing a same-sex embodiment. 1... Mouth tube, 1a... Locking part 1.2
... Cap body, 2a ... Locking part,
3...Retainer, 3a...Outer periphery, a
b, 3c, 3d...-protrusion, 4...
・Backing, 4a... Seal part, 4b...
・・・Reduced thickness, 4c...Folds. 1

Claims (2)

[Scope of utility model registration request] (1) A cap body having a locking part that is locked from below to a locking part provided on the mouth cylinder of the fuel container, and a circle supported within the cap body so as to be rotatable relative to the cap body. In a filler cap comprising a plate-shaped retainer and a backing having a seal portion into which an outer peripheral portion of the retainer is fitted and crimped onto the mouth portion, the filler cap protrudes upward from the retainer and comes into contact with the cap body. A filler cap 0 characterized in that a protrusion is provided to reduce the area, and the thickness of the center side of the backing is made thinner than the seal part of the backing. (2) The filler cap according to claim (1) of the utility model registration, in which pleats are formed in the thinner part of the backing.