JPH0318825Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a fuel filler cap equipped with a fuel filler valve for a cartridge type fuel tank used in an oil stove or the like.

As shown in FIGS. 1 and 2, in the conventional fuel filler cap, the top 1a of the cap 1 is formed into a hollow annular projection, the inner curled portion 1b constitutes a female valve, and the hollow portion of the annular projection is formed. 3, fit the hem 2c of the valve case 2 and fix it with point caulking 4.
On the other hand, an inner cylinder 6 fitted with a rubber ring 5 which becomes a male valve.
is slidably fitted into the valve case 2 via four convex surfaces 2a periodically formed on the inner wall, and the inner cylinder 6 is constantly pressed downward between the valve case 2 and the inner cylinder 6. A spring 9 is interposed to bring the male valve made of the rubber ring 5 into pressure contact with the female valve made of the curled part 1b. 2
b is a concave surface formed by providing a convex surface 2a on the valve case 2, and serves as a passage for fuel and air bubbles. 7
8 is the oil hole drilled at the bottom of the recess 2d provided in the upper part of the valve case 2, and 8 is the recess 2d in the valve case 2.
There are multiple air outflow holes drilled around the periphery.

After screwing the fuel filler cap 10 configured as described above to the filler port of a fuel tank filled with fuel via the cap 1, the fuel tank is turned upside down and the fuel filler cap 10 is turned over.
When loaded into a kerosene stove etc. with the 0 side facing down, the protrusion provided on the kerosene stove pushes up the protrusion 6a and pushes the inner cylinder 6 upwards, separating the male valve from the female valve, so that fuel is supplied to the kerosene stove. Ru.

In the case of such a structure, if the protrusion of the kerosene heater is always placed in the center of the protrusion 6a and pushed up the inner cylinder 6 straight upwards, no problem will occur, but in the unlikely event that the protrusion is off center and protrudes. When pushing up the inner cylinder 6 by applying a diagonal force to the portion 6a, there are four convex surfaces 2a provided on the valve case 2, and a relatively large gap between the outer circumferential wall of the inner cylinder 6 and the convex surface 2a inevitably occurs. A convex surface 2a with a gap is generated, and since the outer circumferential wall of the inner cylinder 6 and the convex surface 2a are in line contact, a specific convex surface 2a and the outer wall of the inner cylinder 6 rub against each other, causing damage to the sliding surfaces of both. A wound occurs and the inner cylinder 6
Accidents that impede the smooth sliding of the wheels begin to occur. This phenomenon appears after using the product for about a year.

The present invention has been made to solve the above problems, and aims to provide a fuel filler cap that will not cause the above-mentioned accidents even if the fuel tank is used for many years.

3 to 6 showing an embodiment of the present invention will be described below. Inside the top 11a of the cap 11 is a triangular annular protrusion 1 with a higher center side.
1b, the inner side thereof is curled 11c to form a female valve 21, and the hollow part 13 of the annular projection 11b is
Then, the hem 12c of the valve case 12 is fitted, and the vicinity of the end of the hem 12c is caulked 14 to fix the valve case 12 to the cap 11. On the other hand, the inner cylinder 16 in which the male valve 22 is formed by fitting the rubber ring 15 into an annular recess 16b having an arcuate cross section provided in the body at the tip end is arranged at equal intervals on the cross section of the valve case 12 and on the outer periphery of the inner cylinder 16. The valve case 12 is slid through three convex portions 12a formed by step-drawing the valve case 12 in the sliding direction so as to make surface contact with the inner cylinder 16 with a width of about 1/6 of the length. A spring 19 is movably fitted and interposed between the valve case 12 and the inner cylinder 16 to constantly press the inner cylinder 6 downward and bring the male valve 22 into pressure contact with the female valve 21.
Reference numeral 12b denotes a recessed portion formed by providing a convex portion 12a on the valve case 12, which serves as a passage for fuel and air bubbles, and further includes a lower fuel outflow hole 12b. Reference numeral 18 designates an air outflow hole cut outward from the top of the valve case 12, and reference numeral 23 designates a packing for preventing oil leakage from the fuel filler port when the fuel filler cap 20 is screwed onto the fuel filler port of the fuel tank. .

The fuel filler cap 20 having the above-described configuration is used by being screwed onto the fuel filler port of a fuel tank in the same way as the conventional fuel filler cap 10.

In this case, the convex portion 12 provided on the valve case 12
Since there are three pieces a, it is easy to center the valve case 12 during molding, and the valve case 12 can be drawn so that it is in close contact with the outer peripheral wall of the inner cylinder 16 with almost no gap. Since it is in surface contact with the portion 12a at a predetermined width, there is almost no lateral vibration when the inner cylinder 16 slides up and down. Even if a force in an oblique direction is applied to the valve 22, the inner cylinder 16 always slides straight upward, and the fuel filler cap 20 does not suffer from accidents that occur with the conventional fuel filler cap 10.

In the above embodiment, the three convex portions 12a of the valve case 12 are arranged at equal intervals in the cross section of the valve case 12 and have a width of about 1/6 of the outer circumferential length of the inner cylinder 16.
Although the valve case 12 is formed by step drawing in the sliding direction so as to be in contact with the inner cylinder 16, it is not limited to the above values as long as the contact with the inner cylinder 16 is in a surface contact state.

The present invention consists of a valve case whose hem is fixed to a cap in which a female valve is formed by inwardly curling an annular protrusion provided at the center of the top, and a spring that fits inside the valve case and presses downward into the interior. and an inner cylinder having a male valve formed at the lower end to fit with the female valve, the valve case being in surface contact with the outer circumferential wall of the inner cylinder at equal intervals and with a predetermined width in the cross section of the valve case. This fuel filler cap for a cartridge type fuel tank is characterized in that the valve case is provided with three convex portions by step drawing in the sliding direction, so that the following effects are achieved.

(1) The valve case and inner cylinder have their axes aligned well and maintain surface contact with almost no gaps.
Since the inner cylinder always slides up and down smoothly, the service life of the fuel filler cap can be significantly extended.

(2) Since the valve case has three convex surfaces, it is easy to center the valve case, which improves the efficiency of highly accurate stepped drawing forming and contributes to reducing the cost of the fuel filler cap.

(3) The axes of the valve case and inner cylinder are well aligned and maintain surface contact with almost no gaps, so the male valve and female valve are always pressed together smoothly, preventing oil leaks. can be prevented.

(4) The valve case and the inner cylinder maintain surface contact with almost no gaps, so even if the protrusion of a kerosene heater or other device is slightly misaligned and an oblique force is applied to the male valve, the inner cylinder remains intact. Since the cylinder always slides up and down smoothly, it is possible to increase the working margin when manufacturing kerosene stoves, etc., contributing to cost reduction by improving work efficiency.

[Brief explanation of the drawing]

1 and 2 are conventional examples, FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIGS. 3 to 6 are examples of the present invention. 3 is a plan view, FIG. 4 is a BB vertical sectional view, FIG. 5 is a bottom view, and FIG. 6 is a CC sectional view of FIG. 4. DESCRIPTION OF SYMBOLS 11... Cap, 11a... Top part, 11b... Annular protrusion, 11c... Curl, 12... Valve case, 12a...
Convex portion, 12c... Hem, 16... Inner cylinder, 19... Spring, 2
1...Female valve, 22...Male valve, 20...Fuel filler cap.

Claims (1)

[Scope of utility model registration request] A valve case having a hem fixed to a cap formed by inwardly curling an annular protrusion provided at the center of the top part to form a female valve, and a spring that fits inside the valve case and presses it downward into the inside. In an inner cylinder having a male valve formed at the lower end to fit with the female valve,
Three convex portions having a predetermined width are provided on the inner surface by step drawing in the sliding direction so that they are spaced at equal intervals in the cross section of the valve case and are in surface contact with the outer circumferential wall of the inner cylinder with a predetermined width. A fuel filler cap for a cartridge type fuel tank, comprising the valve case.