JPS5821409Y2 - tank cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tank cap that fits into an inlet of an oil tank, a fuel tank, etc.

Generally, this type of tank cap is tightened and fitted with a rubber elastic sealing member interposed between the cap and the tank inlet.

By the way, when screwing and tightening the cap onto the injection port, there is a tendency to tighten the cap too strongly in order to achieve a good seal.

In this case, in the conventional cap, the sealing member is easily damaged by being strongly twisted due to the relative rotation between the cap and the inlet edge of the tank, and the sealing member no longer performs its original sealing function.

The present invention aims to solve this problem and improve the durability of the sealing member.

That is, in the tank cap of the present invention, the lid is slidably fitted onto the top of the plug that is screwed into the inlet of the tank, and a spring is installed between the back surface of the top of the lid and the top surface of the plug. Establish and warn.

The spring is installed between the lid and the plug so as to press the inner circumferential surface of the side of the lid, and the locking part formed at one end of the spring is connected to an opposing protrusion formed on the top surface of the plug. The spring is located between the two parts, and the direction in which the spring extends from the locking part is aligned with the direction in which the lid is rotated when the lid is tightened.

The tank cap of the present invention is attached to the tank inlet by rotating the lid body and rotating the stopper integrally with the lid body.
If the lid is rotated more than the predetermined tightening state, the lid will idle relative to the stopper.

Therefore, a predetermined sealing force is maintained, and even if the lid is excessively tightened, the sealing member will not be twisted accordingly, preventing damage and having good durability.

Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

As shown in FIGS. 1 and 2, the inlet 11 of the tank 1 and the cylindrical portion 21 of the stopper 2 are each formed with a screw so that they can be screwed together.

A rubber annular seal member 4 having a circular cross section is fitted onto the outer periphery of the proximal end of the cylindrical portion 21 .

On the upper surface of the circular top 22 of the plug body 2, an annular partition wall 2 is formed on the outer periphery.
3 are provided concentrically, and their opposing ends 231 and 232 are bent toward the center, forming a notch between them.

The top 22 of the plug 2 is covered with a lid 3, and the open end of the lid 3 forms a curved portion 24, and is fitted onto the top 22 of the plug so that it can rotate relative to the top 22 in the circumferential direction. has been done.

A torsion coil spring 5 is inserted between the side inner circumferential surface of the lid 3 and the partition wall 23 in a compressed state in its centripetal direction.
The inner peripheral surface of the side part is pressed.

The winding direction of the spring 5 coincides with the rotating direction of the lid body 2 when the cap is tightened, and the lower end of the spring 5 forms a hook portion 51 between the opposite ends 231 and 232 of the partition wall 23. It is located in

Next, the operation of the cap will be explained with reference to FIGS. 3 to 5.

In the state shown in FIG.
When the lid 3 is screwed into the hole shown in the figure) and rotated clockwise, the plug 2 and the spring 5 become one body due to the frictional resistance between the spring 5 and the spring abutting surface of the plug 2 due to the biasing force of the spring 5. The spring 5 rotates as shown in Figure 4.
The hook portion 51, which serves as a locking portion, is hooked to the end portion 231 of the partition wall 23 of the plug body 2.

When the lid 3 continues to rotate further, the spring 5 pressed against the lid 3 and its inner circumferential surface, and the hook portion of the spring 5 press the end 2 of the partition wall.
31 rotates integrally with the plug 2 to which it is hooked, the plug 2 is screwed into the tank inlet 11, and the sealing force by the seal member 4 increases.

If the lid body 3 continues to rotate further, the sealing force increases and the frictional resistance between the sealing member 4 and its contact surface increases, but since the spring 5 is twisted in the winding direction and compressed in the centripetal direction. The frictional resistance between the spring 5 and the inner peripheral surface of the lid body 3 with which it comes into contact decreases.

Thus, the sealing member 4 reaches a preset sealing force.
When the frictional resistance on the side reaches a predetermined value, the frictional resistance becomes larger than the frictional resistance on the spring 5 side.

Therefore, when the lid 3 is rotated any further, the lid 3 idles relative to the stopper 2 and the spring 5 hooked thereto.

That is, in this tank cap, a predetermined sealing force is reliably obtained, and the seal member 4 is free from twisting and damage caused by excessive tightening of the cap, and the durability of the seal member 4 can be significantly improved. .

Further, after a predetermined sealing force is obtained, the lid body 3 smoothly idles without generating any abnormal noise due to its idle operation.

Next, when removing the tank cap, rotate the lid 3 counterclockwise.

As a result, the spring 5 is wound back and expanded in the centrifugal direction, and rotates counterclockwise together with the lid, so that the hook 51 of the spring 5 is attached to the end 2 of the partition wall 23 as shown in FIG.
It is hung on 32.

When the lid 3 continues to rotate further, the lid 3, spring 5, and stopper 2 rotate integrally, and are disengaged from the tank inlet 11 and removed.

As mentioned above, the tank cap of the present invention is designed to idle when a predetermined sealing force is reached when tightened to the tank inlet. It has good durability because there is no friction, twisting, or damage to the sealing member due to tightening, and there is no abnormal noise caused by the idling operation of the lid after the specified sealing force is obtained, and the structure is simple. It exhibits extremely excellent practical effects.

In the embodiment, a torsion coil spring 5 is used as the spring, but it is also possible to use a simple C-shaped spring instead of a coiled one as long as sufficient frictional force can be obtained at the outer circumference.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a tank cap according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 to 5 are explanatory views of its operation. DESCRIPTION OF SYMBOLS 1...tank, 11...tank inlet, 2...stopper, 23...stopper partition,
231, 232... Opposing ends of partition walls, 3...
... Lid body, 4 ... Seal member, 5 ...
·spring.

Claims (1)

[Scope of utility model registration request] The lid is slidably fitted onto the top of the plug that screws into the tank inlet, and a spring is inserted between the lower surface of the top of the lid and the top of the plug with its biasing force to push the inner periphery of the side of the lid. The locking portion formed at one end of the spring is positioned between opposing protrusions formed on the upper surface of the plug body, and the spring extends in the direction of extension from the locking portion. A tank cap characterized in that the tightening of the lid body is arranged to match the direction of rotation.