JPS5828987Y2 - Sealing material for container lids - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing material used for a screw-on container lid.

The present invention is an improvement of sealing materials, particularly O-rings, and provides good airtight sealing performance for screw-in lids used for automobile fuel tanks, radiator tank caps, etc. .

Conventionally, when attaching a screw-in cap to the container mouth,
Many of them have a structure that limits the tightening torque in order to protect the equipment, and when the tightening torque reaches a certain value, a ratchet mechanism is activated, causing the lid to idle and prevent it from being screwed in any further.

Even if containers with this structure are sealed at low temperatures, they often leak when the temperature rises and the pressure inside the container increases.

In this case, an O-ring or a flat backing is used as the sealing material.

In particular, when the contents of an automobile fuel tank are volatile, such as gasoline, not only the gasoline leaks, but also its vapor leaks outside, which can lead to serious problems.

The purpose of the present invention is to eliminate the defects of the conventional sealing materials described above, and the O-ring 3 made of an elastic body is formed with a groove 3a around the entire outer circumferential side surface, and a fin is formed around the entire lower surface of the O-ring 3. The gist is a sealing material for a container lid in which a protrusion 3b of a shape is formed.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the sealing material with a portion cut out, and Figure 2 is a longitudinal cross-sectional view showing the sealing material used in a screw-in cap. The left part shows the sealing material when it is not compressed.

FIG. 3 is an enlarged view of section A in FIG. 2.

1 is a lid, 2 is a container mouth formed with a female thread, and 3 is a sealing material. A ratchet mechanism 4 is built in the lid as usual, and when the tightening torque exceeds a certain value, it is struck by the pressure of a spring 4a. (Ratchet) 4b slips and prevents tightening from proceeding.

The sealing material 3 has an annular groove 3a formed over the entire circumference of the outer circumferential side of a prototype O-ring, and fin-like protrusions 3b on the lower surface of the O-ring.

As the lid 1 is screwed in, the groove 3a is compressed by a constant torque and flexes to close the entrance of the groove, and due to this deformation, the protrusion 3b on the lower surface moves in a direction so as to come into close contact with the inside of the container mouth 2. to seal the mouth.

When the pressure inside the container increases in this state, the pressure further presses the protrusion of the sealing material against the inside of the container mouth, making the seal even more reliable.

In the above embodiment, the groove 3a has a U-shaped cross section, but the groove 3a is not limited to this shape as long as it can bring the protrusion 3b closer to the container mouth.

Similarly, the protrusions 3b are not limited to those having a triangular cross section, but may also be of a thin plate shape or the like, as long as they fit closely to the mouth of the container and effectively isolate the inside and outside of the container.

Since the sealing material of the present invention is formed by providing the groove 3a and the protrusion 3b on the O-ring as described above, as the lid is tightened, the protrusion 3a expands outward and comes into close contact with the inside of the container opening. As the internal pressure increases, the adhesion becomes stronger,
Tightening ensures prevention of liquid and steam leakage from the lid without significantly increasing the torque, and is effective in terms of safety.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the sealing material of the present invention, and Fig. 2 is a longitudinal side view of a screw-in cap using the sealing material, with the sealing material pressed against the right side. , shows the sealing material when it is not pressed against the left part. FIG. 3 is an enlarged view of portion A in FIG. 2. 1: Lid, 2: Container mouth, 3: Seal material, 3a: Groove, 3b
: protrusion, 4: ratchet mechanism, 4a spring, 4b
: Surface ratchet.

Claims (1)

[Scope of utility model registration request] A groove 3a is formed on the entire circumference of the outer peripheral side surface of the O-ring 3 made of an elastic body.
A sealing material for a container lid in which a fin-like protrusion 3b is formed on the entire circumference of the lower surface.