JPH076115Y2 - Liquid leak prevention cap - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention is provided with a vent hole for adjusting the internal pressure of a fuel tank of a vehicle, other liquid containers, etc. The present invention relates to an improvement of a liquid leakage prevention cap having a function of preventing liquid leakage from these ventilation holes when various fluctuations occur.

<Prior art> When the liquid container falls over or when it shakes suddenly in a direction other than the vertical direction, liquid is discharged from the breather passage that connects the inside of the fuel tank to the outside air or the vent hole of the valve element provided in the middle of the fuel pipe As for the structure to prevent leakage,
As shown in No. 59-56188, a valve body that can close the ventilation hole is elastically supported by a spring in the closing direction, and the ventilation hole is always opened by the weight above it. In addition, a vertically movable valve element is installed in the valve box as seen in Japanese Utility Model Publication No. 60-159880, and when the valve element is tilted by a predetermined angle or more, the weight operates and the valve element is In addition to moving the valve hole in the closing direction, and in the structure incorporated in the cap as in the present invention, a spherical closing valve element can be freely moved below the vent hole as seen in U.S. Pat.No. 4,162,021. The housed items are proposed.

In all of these conventional products, the weight of the weight is directly used as the force for actuating the closing valve body, so that a large weight (valve body) is required to obtain the large force required to ensure the closing. ) Was required. Therefore, if the weight is largely occupied inside the cap, the weight of the cap is increased, or conversely, if the weight of the weight is reduced to reduce the weight, the certainty of the operation at the time of falling cannot be obtained. It had a problem to be solved.

Therefore, the inventors of the present invention urge the cut valve (3) by the closing spring (4) in the closing direction of the vent hole (2) provided in the plug body (1) as typified by FIG. At the same time, a lever (5) rotatable against the closing spring (4) of the cut valve (3) is pivotally supported at one end, and the other end of the lever (5) is provided at the weight accommodating chamber (6). Weight that can roll inside (7)
We have developed a liquid leakage prevention cap that is placed below the
It is proposed in Japanese Utility Model Sho 62-4363 (Japanese Utility Model Sho 63-114962).

In the liquid leakage prevention cap having such a structure, under normal conditions, the weight (7) is placed on one end of the lever (5), and the cut valve (3) levers the lever to prevent the closing spring (4) from being biased by a small weight. To maintain the vent hole (2) in an open state. When falling or when there is a sudden swing in a direction other than the vertical direction, the weight (7) is removed from one end of the lever (5), the pressing of the lever (5) is released, and the lever (5) is urged to cut. The valve (3) closes the vent (2). In this way, the lever (5) is interposed between the weight (7) and the cut valve (3),
The light weight also has the effect of opening the vent hole against the bias of the closing spring (4). This has the feature that a small weight can be surely opened and closed.

<Problems to be solved by the device> This structure has some features that are not available in the past and is put to practical use. However, as a result of subsequent studies, it was cut when positive pressure (the tank internal pressure is higher than the external pressure). When the valve (3) is closed, it is pushed by its positive pressure, and the force required to open the valve when it returns to normal is larger than the force that would otherwise be required. It became clear. Therefore, the problem was the need to normally open the valve regardless of the pressure in the tank and to stabilize it at the set pressure.

<Means for Solving the Problem> Then, as a result of various studies, in such a liquid leakage prevention cap, the packing (8) of the cut valve (3) is attached to the lever (5) at a position away from the center thereof. Retaining solved the problem.

<Operation> With such a structure, the cut valve (3) is closed at the time of positive pressure and the packing (8) of the cut valve (3) is closed.
Even if is pressed to a positive pressure, if the valve is opened when it returns to normal, it will be pulled open in a biased position near the holding position of the packing (8), so it will open even with a small force, and the valve will open. Be constant.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a first embodiment of the present invention. FIG. 1 is a side view of a liquid leakage prevention cap, showing a fragmentary side view, and FIG. 2 is a sectional view taken along line AA in FIG. . FIG. 3 is a central sectional view of only the cut valve of the first embodiment. FIG. 4 is a central sectional view of the second embodiment.

The illustrated plug body (1) comprises an outer cap (11), an inner cap (12) and an inner cap bottom lid (13) inserted and fitted into the outer cap (11). Inner cap (12)
Is equipped with an external thread and an O-ring packing (14) for screwing into the inlet of a fuel pipe that extends to the fuel tank. A positive pressure valve (15) is provided above the plug body (1) to open the fuel tank to adjust the internal pressure when the positive pressure exceeds a predetermined pressure, and vice versa. Negative pressure valve (1
6) and the accommodation chamber (17), and the positive pressure valve (15) and the negative pressure valve (16) are biased in opposite directions by the springs (18) (19).

Inside the inner cap (12) of the stopper body (1), there is a storage chamber (17) such as the positive pressure valve (15), but the direction of closing the vent hole (2) provided in the partition wall (23) separating it. The cut valve (3) is biased by the closing spring (4). Although details of the cut valve (3) will be described later, the structure is such that the packing (8) is held near the middle of the lever (5). The closing spring (4) of the cut valve (3) is provided between the intermediate portion of the lever (5) and the outer lid (13) of the inner cap, and the lever (5) can rotate against this. As you can see, one end is pivotally supported. The other end of the lever (5) is arranged below the weight (7) which can roll in the weight accommodating chamber (6). The solid line shows the state in which the ventilation hole (2) is opened in the normal state, but when it is abnormal, the ventilation hole (2) can be closed like the two-dot chain line.

An example of a mode in which the packing (8) of the cut valve (3) is cantilevered near the middle of the lever (5) is shown in FIGS. 3 and 4. The packing (8) is provided with a holding protrusion (9) at a position apart from the center of the back surface of the dish.
The holding protrusion (9) is loosely fitted in a holding hole (20) provided in the lever (5). A hole (10) is provided at the center of the packing (8). This hole (10) is a lever (5)
It is inserted in the protrusion (21) of. When the ventilation hole (2) is opened from the closed state by the cut valve (3) and the lever (5) is rotated and separated, this hole (1
0) is opened to allow gas to flow in and out, which serves to open the packing (8) more easily. Even if this hole (10) is not provided as shown in FIG. 4, by holding the packing (8) at a position apart from the center, it becomes much easier to open than the conventional cut valve.

<Effect of the device> The liquid leakage prevention cap having such a structure can be normally opened regardless of the pressure in the tank.
It can be stabilized at the set pressure.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a side view of a liquid leakage prevention cap, showing a fragmentary side view, and FIG. 2 is a sectional view taken along line AA in FIG. . FIG. 3 is a central sectional view of only the cut valve of the first embodiment. FIG. 4 is a central sectional view of the second embodiment. FIG. 5 is a fragmentary side view of a conventional liquid leakage prevention cap. (1) Plug, (2) Vent hole (3) Cut valve, (4) Closing spring (5) Lever, (6) Weight accommodating chamber (7) Weight, (8) Packing (9) Holding protrusion, (10) ) Hole (20) Holding hole provided on the lever (21) Lever protrusion

Claims (1)

[Scope of utility model registration request] 1. A lever (5) having a base portion rotatably rotatably supported at a lower portion of a stopper (1) and having a curved front portion, and a cut valve () is provided on an upper surface of the lever (5). 3) is provided with a closing spring (4) between the lower surface and the bottom lid of the plug body, and the cut valve (3) is urged in the closing direction of the vent hole (2) provided in the plug body (1). The other end of the lever (5), which is rotatable against the closing spring (4) of (3), is provided with a weight accommodating chamber (6).
In a liquid leakage prevention cap, which is arranged below a weight (7) which can roll inside, the lever (5) with the packing (8) of the cut valve (3) separated from the center of the packing (8). A liquid leakage prevention cap, characterized in that the liquid leakage prevention cap is held on the lever (5) at a position close to the support shaft.