JPS6021264B2 - pressure vessel cap - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cap for a pressure vessel.

More specifically, the present invention relates to a lock-type cap used, for example, in the fill port of an automobile fuel tank.
Conventionally, screw-on caps for pressure vessels, etc., simply have a threaded portion on the skirt at the bottom of the lid, so when tightening the cap manually without using a machine, the operating force is required. There are individual differences, and this difference in operating force impairs the airtightness within the container, resulting in liquid leakage, gas leakage, and the like.

In order to improve the drawbacks of such a secondary structure, a latch member is provided on the inner wall surface of the outer shell of the lid, and a claw is provided on the upper side of the inner body to control the torque of the tightening operation for pressure vessels. A cap has been proposed (Tokusei Sho 5)
1-53122).

However, in such caps, the inner body and the claws protruding from the upper part are made of synthetic resin such as polyacetal or nylon, so there may be regional differences between cold and warm regions or differences in winter. The physical properties of the synthetic resin change significantly due to seasonal differences such as summer, and temperature differences due to time differences such as night and day, resulting in changes in the torque value. Therefore, it is difficult to control the torque at a constant value. Not only is this unsatisfactory, but since bending force is constantly acting on the synthetic resin claw, there is a problem with durability, and if the claw becomes worn or damaged, it is virtually impossible to repair or replace it. be. Further, since the shape of the claw portion is complicated, complicated steps are required to form the claw portion. Furthermore, since the claw protrudes horizontally from the upper side of the main body and is received by the latch member on the inner wall surface of the outer shell, the diameter of the outer shell is inevitably large, which makes it difficult to use the limited space. This may be inconvenient for caps used in The present invention was made in order to improve the conventional cap as described above, and includes a cap body for closing the opening of a pressure vessel, a handle member for screwing the cap body into the closing opening, the handle member and the A pressure vessel cap having a torque transmitting means provided between the cap body and the handle member for transmitting a constant rotational torque of the handle member to the cap body, wherein the torque transmitting means is arranged between the cap body and the handle member. It has an internal space formed in between and a branch part that projects radially from an embossed part formed in the center, and a claw part formed at the tip of the branch part has an elastic surface in the axial direction of the pressure vessel cap. a slope spring installed in the internal space so as to have the following characteristics; a latch member provided on the handle member side or the cap body side and with which the claw portion engages in the axial direction;
The cap for a pressure vessel is characterized in that it has a rib that projects between the support parts from the other side of the side where the latch member is provided and rotates the leaf spring in conjunction with the other side.

Next, the present invention will be explained in detail with reference to the drawings.
That is, as shown in FIGS. 1 to 3, a cap body 2 having a hollow part inside and a threaded part 1 on the outside has a handle member 4 equipped with a handle 3 on the top, and a ring-shaped plate. Either the stopper member 5 made of the above material is brought into contact with the flange portion 6 of the cap body 2 and the green bottom portion 7 of the handle member 4 and fixed with a screw 9 through a washer 8, or the cylindrical edge of the handle member 4 is fixed inside. caulking (not shown)
The handle portion 4 is covered by the following method. Although the handle portion 4 is usually made of metal, the cap body is made of synthetic resin such as polyacetal or nylon, or metal. In the space 10 thus formed by the cap body 2 and the handle portion 4, a latch member 11 is provided on the horizontal surface of the bottom periphery of the cap body 2.

Preferably, the latch member 11 is formed integrally with the cap body 2, but it is also possible to manufacture only the latch member at the edge and fix it to the bottom peripheral green portion of the cap body 2. On the other hand, the emposu part 1 protrudes upward in the central part.
A metal five-plate spring, for example, a cross-shaped plate spring 14, is inserted into the space 10 so that the distal end 13 of the metal spring 14 has a shape of 2 and is pressed against the latch member 11. Therefore, since the top of the embossed part 11 is always pressed by the handle member 14, the leaf spring 14 has its tip end 1
3 will always press the latch member 11. This tip portion 13 is provided with a protrusion 15 that protrudes downward as a claw portion, and this ensures engagement with the latch member 11. Furthermore, a spring guide rib 16 protrudes downward from the internal ceiling surface of the handle member 4 on the side of the support part 14a of the leaf spring 14 in order to prevent rotation of the spring 14 and the handle member 4, and a cap body. It is slidably provided on the internal bottom surface of 2. In this way, a torque transmission means T is constructed between the cap body 2 and the handle portion 3. Note that an O-ring 17 is fitted with iron between the threaded portion 1 and the flange portion 6 on the outer side of the cap body 2. Figure 4 shows
FIG. 6 is a sectional view showing another embodiment of the cap according to the invention.

In the case of the figure, a latch member 18 is provided within a space 10 formed by the cap body 2 and the handle member 4 on a horizontal surface of the ceiling peripheral portion of the handle member 4. This latch member 18 may be formed integrally with the handle member 4, or only the latch member 18 may be manufactured separately and fixed to the green portion of the ceiling portion of the handle member 4. . On the other hand, a metal leaf spring, for example, a cross-shaped leaf spring 2, has an embossed part 19 projecting downward in the central part, and has a tip end 20 pressed against the latch member 18.
1 is inserted into the space 10. Therefore, the leaf spring 21 always keeps the bottom of the embossed part 19 on the cap body 2.
Since the tip portion 20 is pressed by the latch member 18, the tip portion 20 always presses the latch member 18. This tip 201 is provided with an upwardly projecting projection 22 as a pawl, which ensures engagement with the latch member 18. Furthermore, a guide rib 23 protrudes upward from the inner bottom surface of the cap body 2 on the side of the support portion 21a of the leaf spring 21 in order to prevent the spring 21 and the handle member 4 from rotating. It is slidably installed on the internal ceiling surface. In this way, a torque transmission means T is constructed between the cap body 2 and the handle member 3. Note that the cap shown in FIG. 4 is similar to the cap shown in FIGS. 1 to 3 in other parts, so the same → numbers indicate the same parts. The pressure vessel cap constructed in this manner is used in the following manner.

In other words, the seat 24 is like a filler port of an automobile fuel tank.
Then, the cap is screwed onto the seat 24 by applying the threaded portion 1 of the cap and rotating the handle 3 of the cap. In this case, when the handle 3 is rotated, the latch portion of the torque transmitting means T provided between the cap body 2 and the handle member 4 is pressed into contact with the claw portion due to the spring restoring force of the leaf spring. When the clutch is activated and the rotational operating force reaches a certain value, only the handle member 4 begins to idle. When the handle member 4 starts to spin idly, a clicking sound of the clutch is emitted, so that the degree of vertical attachment of the cap can be easily determined, and the pressure inside the container can be maintained constant. The pressure vessel cap according to the present invention has the above-described structure, so when the cap is used, when the clutch is activated and the operating force reaches a certain level, only the handle portion will idle; Since the operating force is not transmitted to the main body, and the operating sound is emitted when the handle rotates idly, it is easy to determine whether the cap is attached vertically and the operation can always be controlled with a constant torque.

Therefore, the pressure inside the container can always be kept constant. In addition, since a metal leaf spring is used in the clutch mechanism,
Its physical properties do not change due to temperature changes, and it is not only able to maintain a constant torque but also has durability. Furthermore, since the structure is simple, the number of parts is small and manufacturing is easy, and even if the spring breaks down, it can be replaced. Furthermore, since the latch part is provided in the horizontal part of the space, the outer diameter can be smaller than that of the conventional product, and therefore it can be used in places where only limited space is available. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the pressure vessel cap according to the present invention with the handle portion removed, FIG. 2 is a plan view of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the cap, and FIG. 4 is a cross-sectional view showing another embodiment of the cap of the present invention.

1...Threaded part, 2...Cap body, 3...
...Handle, 4...Handle member, 5...
... Stopper member, 10 ... Space part, 11,
18... Latch section, 12, 19... Emboss section, 13, 20... Spring tip, 14, 21...
...Plate spring, 15, 22...Protrusion of leaf spring, 1
6,23...Rib, 17...○Ring, 24...
…seat.

Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A cap body that closes an opening of a pressure vessel, a handle member for screwing the cap body into the opening, and a cap body provided between the handle member and the cap body, so that a constant rotational torque of the handle member is transferred to the cap body. A pressure vessel cap having a torque transmitting means for transmitting to the main body, the torque transmitting means protruding radially from an internal space formed between the cap main body and the handle member and an embossed part formed in a central portion. It has a support rod part, and a plate spring installed in the internal space so that a claw part formed at the tip of the support rod part has elasticity in the axial direction of the pressure vessel cap, and a leaf spring installed on the handle member side or A latch member provided on the cap main body side and with which the pawl engages in the axial direction; and a latch member provided protruding between the support rod from the other side on which the latch member is provided, causing the leaf spring to rotate in conjunction with the other side. 1. A cap for a pressure vessel, characterized in that it has a rib that allows the pressure vessel to open.