JP2012067824A - Dust-proof cover for gas socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-proof cover capable of preventing a cap part from being left without being attached to a socket when the socket is not used.SOLUTION: An attachment ring part 2 which is to be attached to a base end part of the socket S is connected to cap part 3 which is to be fitted into an outer circumference of the top end part of the socket S by means of a connection arm part 4. When the cap part 3 is detached from the socket S, the connection arm part 4 supports the cap part 3 while allowing the axial line of the cap part to accord with the axial line of the socket S.

Description

  The present invention relates to a dustproof lid for a gas socket for preventing dust from entering and adhering to a connection hole of the gas socket.

  Generally, this type of dustproof lid is detachably fitted to a mounting ring portion (mounting portion) attached to the base end portion of the socket and the outer periphery of the tip end portion of the socket, as described in Patent Document 1 below. A cap portion (dust-proof portion) and a connecting arm portion that connects the cap portion and the mounting ring. The connecting arm portion is configured to be elastically deformable by an elastic member such as rubber. Then, when the connecting arm portion is elastically deformed, the cap portion moves between an attachment position fitted to the outer periphery of the tip end portion of the socket and a separation position separated from the socket in a direction orthogonal to the axis. Can be done.

  In the dustproof lid for gas socket having the above-described configuration, when the socket is used, the cap portion is removed from the socket, and the plug is connected to the socket. At this time, since the cap portion is connected to the socket via the connecting arm portion and the mounting ring, a situation where the cap portion is lost can be prevented. When the socket is not in use, the plug is removed from the socket. Thereafter, the cap portion is fitted to the outer peripheral surface of the front end portion of the socket. This prevents dust from entering the connection hole of the socket.

JP 2010-48368 A

  In the conventional dustproof lid for a gas socket, when the socket is not used, the cap portion is supported by the connecting arm portion, but the cap portion hangs downward due to its own weight and is spaced downward from the socket. For this reason, the user of the socket sometimes forgot to fit the cap portion into the socket and left it alone. In such a case, dust enters and adheres to the connection hole of the socket. In particular, if dust adheres to the packing provided inside the socket, the dust may be interposed between the packing and the tip end surface of the plug when the plug is connected, which may reduce the airtightness between the socket and the plug. is there.

In order to solve the above problems, the present invention provides a mounting portion that is attached to the base end portion of the socket, and a connection hole that is detachably attached to the distal end portion of the socket, and is formed in the distal end surface of the socket at the time of mounting And a connecting arm portion that connects the dust-proof portion and the mounting portion, and the dust-proof portion is attached to the tip of the socket, and the socket is perpendicular to the axis thereof. In the dust cover for a gas socket in which the connecting arm portion is formed so as to be elastically deformable so that the connection arm portion can be moved between the separated positions separated in the direction to be moved, when the dust-proof portion is removed from the socket, The dust-proof portion is supported by the connecting arm portion in a state of facing the front end surface of the socket.
In this case, the dustproof portion is formed in a bottomed cylindrical shape, and the outer periphery of the tip of the socket is removably fitted from the tip opening of the dustproof portion, so that the dustproof portion is detachably attached to the socket. It is desirable that
Further, when the dust-proof portion is removed from the socket, the dust-proof portion has the opening facing the tip end surface of the socket, and the axis is aligned with the axis of the socket. It is desirable that the arm is supported.

  According to the present invention having the above-described configuration, when the plug is removed from the socket, the dustproof portion is positioned in front of the socket so as not to be separated in a direction perpendicular to the axis of the socket. Therefore, the user attaches the dustproof part to the socket without forgetting. Therefore, dust can be prevented from entering the connection hole.

FIG. 1 is a front view showing a first embodiment of the present invention. FIG. It is a top view which shows the same embodiment. 3 is a cross-sectional view taken along line XX of FIG. FIG. 4 is a plan cross-sectional view showing a state in which the cap portion of the embodiment is fitted to the outer periphery of the distal end portion of the socket. FIG. 5 is a plan cross-sectional view showing a state in which the cap portion of the same embodiment is removed from the socket and positioned at the removal position. FIG. 6 is a plan sectional view showing a state in which the cap portion of the embodiment is separated from the socket in a direction orthogonal to the axis thereof and is located at the separation position. FIG. 7 is a plan view showing a state where the socket using the dustproof lid of the embodiment is connected to the plug of the gas stopper. FIG. 8 is a front view showing a second embodiment of the present invention. FIG. 9 is a plan view showing the same embodiment. FIG. 10 is a right side view showing the same embodiment. FIG. 11 is a cross-sectional view taken along line XX of FIG. 12 is a cross-sectional view taken along line XX of FIG. FIG. 13 is a plan sectional view showing a state in which the cap portion of the embodiment is fitted to the outer periphery of the distal end portion of the socket. FIG. 14 is a plan sectional view showing a state in which the cap portion of the embodiment is fitted to the outer periphery of the distal end portion of the socket. FIG. 15 is a plan sectional view showing a state in which the cap portion of the same embodiment is removed from the socket and positioned at the removal position. FIG. 16 is a plan sectional view showing a state in which the cap portion of the embodiment is separated from the socket in a direction orthogonal to the axis thereof and is located at the separation position. FIG. 17 is a plan view showing a state in which the socket using the dustproof lid of the embodiment is connected to the plug of the gas stopper. FIG. 18 is a front view showing a state where the socket using the dust cover of the embodiment is connected to the plug of the gas stopper.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 7 show a first embodiment of the present invention. As shown in FIGS. 1 to 3, the dust-proof cover 1 for a gas socket according to this embodiment includes an attachment ring part (attachment part) 2, a cap part (dust-proof part) 3, and a connecting arm part 4. The mounting ring portion 2, the cap portion 3, and the connecting arm portion 4 are integrally formed of the same material as a whole. However, the attachment ring portion 2, the cap portion 3, and the connecting arm portion 4 are not necessarily formed of the same material, and may be integrally provided by different materials.

The mounting ring portion 2 has a circular shape, and as shown in FIGS. 4 to 7, the base end portion of the socket S defined in Japanese Industrial Standard JIS S 2135 (the right end portion in each drawing; the joint portion Sa is Attached to the provided end). That is, on the outer peripheral surface of the base end portion of the socket S, an annular recess Sb that extends annularly about the axis L of the socket S is formed. An attachment ring portion 2 is attached to the annular recess Sb. The attachment ring portion 2 is inserted into the socket S from one end thereof by being expanded in diameter against its own elasticity, and then attached to the annular recess Sa so as not to fall off by being reduced in diameter. As described above, the mounting ring portion 2 needs to be elastically expanded and contracted, and for this purpose, it is made of rubber or other resin having elasticity.

  The attachment ring part 2 is for attaching the dustproof lid 1 to the socket S by being attached to the socket S itself, and if it has such an attachment function, it should be necessarily formed in a ring shape. Alternatively, other shapes may be used. For example, a protruding portion that protrudes in the radial direction is formed at the tip of the socket S, and a through hole that extends in the direction of the axis L of the socket S is formed in the protruding portion. Then, it may be formed in a shaft shape so that it can be attached to the through hole so as not to drop off by expanding the diameter.

  The cap portion 3 is for preventing dust from entering a connection hole (not shown) formed in the front end surface of the socket S when the socket S is not used. The cylindrical portion 3a and the cylindrical portion 3a The bottom part 3b which closes one end opening part is formed in the bottomed cylindrical shape. The cap part 3 is made of the same material as the mounting ring part 2. Therefore, the cap part 3 can be expanded and contracted by its own elasticity. The inner diameter of the cap portion 3 in the natural state of the cylindrical portion 3a, that is, the inner diameter when no external force is applied to the cylindrical portion 3a, is set to be slightly smaller than the outer diameter of the tip portion of the socket S. Therefore, the tip of the socket S is fitted into the cylindrical portion 3a in a press-fit state. In this fitted state, the connection hole of the socket S is covered with the cap portion 3. Therefore, dust can be reliably prevented from entering the connection hole. Moreover, since the inner peripheral surface of the cylindrical portion 3a is pressed against the outer peripheral surface of the socket S due to the elasticity of the cylindrical portion 3a, the cap portion 3 is prevented from coming out of the socket S due to the frictional resistance therebetween.

  An annular protrusion 3c is formed on the inner peripheral surface of the cylindrical portion 3a. When the cylindrical portion 3a is extrapolated to the distal end portion of the socket S until the bottom portion 3b hits the distal end surface Sc of the socket S (the position of the dust cover 1 relative to the socket S at this time is the mounting position). .), An annular stepped surface Sd formed at the tip of the socket S (this annular stepped surface is formed on the outer peripheral surface of the operation cylinder Sf described later) and is arranged so as to be in an annular pressure contact. ing. Further, when the annular projecting portion 3c is in press contact with the stepped surface Sc, the cylindrical portion 3a is more reliably prevented from coming out of the tip end portion of the socket S and dust entering the connection hole. In this manner, the cap portion 3 is prevented from coming out of the socket S and entering the connection hole of the dust by the annular projecting portion 3c, so that the cylindrical portion 3a is not necessarily pressed into the outer peripheral surface of the distal end portion of the socket S. There is no need for fitting, and the inner diameter of the cylindrical portion 3a may be equal to or slightly larger than the outer diameter of the tip of the socket S. In addition, the entry of dust into the connection hole is also prevented by the front end surface Sc of the socket S abutting against the bottom 3b. However, the bottom 3b does not necessarily have to abut against the front end surface Sc. In that case, when the cap portion 3 is positioned at the attachment position, the bottom portion 3b is separated forward from the tip surface Sc.

  As shown in FIG. 3, the cap part 3 is arranged with the opening part facing the attachment ring part 2. In addition, the mounting ring portion 2 and the cap portion 3 are arranged in a state where their axis lines coincide with each other and are spaced apart from each other by a predetermined distance in the axis line L direction. The attachment ring portion 2 and the cap portion 3 are connected by a connecting arm portion 4. The connecting arm portion 4 has an elongated plate shape with a rectangular cross section, and one end portion thereof (the right end portion in FIG. 3) is integrally provided on the outer peripheral portion of the end surface located on the cap portion 3 side of the mounting ring portion 2. The other end portion is integrally provided on the inner peripheral portion of the end face located on the attachment ring portion 2 side of the cap portion 3. Therefore, as shown in FIG. 5, when the attachment ring portion 2 is attached to the socket S, the cap portion 3 is supported by the socket S via the connecting arm portion 4 and the attachment ring portion 2. At this time, the connecting arm portion 4 extends in parallel with the axis L of the socket S. The connecting arm portion 4 may have a square cross section or a circular cross section, and the cross sectional shape is arbitrary.

As is apparent from the fact that the connecting arm portion 4 is formed integrally with the attachment ring portion 2 and the cap portion 3, the connection arm portion 4 is made of an elastic material such as rubber, like the attachment ring portion 2 and the cap portion 3. Therefore, the connecting arm portion 4 can be elastically deformed. By elastically deforming the connecting arm portion 4, the cap portion 3 can move between an attachment position shown in FIG. 4 and a separation position shown in FIG.

  As shown in FIG. 5, the length of the connecting arm portion 4 is set so that the cap portion 3 is positioned forward of the socket S in the axis L direction when the connecting arm portion 4 is in a natural state without being deformed. Has been. Further, the connecting arm part 4 is elastically deformable, but when the cap part 3 is supported in a state where no external force acts on the connecting arm part 4 and is horizontal, the cap part hardly deforms. 3 is strong enough to support. In particular, in this embodiment, the connecting arm portion 4 supports the cap portion 3 in a state where the axis line thereof coincides with the axis line L of the socket S. Hereinafter, the position shown in FIG.

  When the cap portion 3 is located at the removal position, the end surface 3b on the opening side of the cap portion 3 is located on the proximal end side of the socket S by a slight distance from the distal end surface Sc of the socket S in the axis L direction. Yes. This is because the chamfer Se is formed on the outer peripheral surface of the tip of the socket S. The end surface 3b may be positioned at the same position as the front end surface Sc of the socket S when the cap portion 3 is positioned at the removal position, or may be positioned slightly forward from the front end surface Sc. In any case, since the length of the connecting arm portion 4 is set so that the end surface 3b on the opening side of the cap portion 3 is located at substantially the same position as the front end surface Sc of the socket S, it is shown in FIG. As described above, when the cap portion 3 is fitted to the outer peripheral surface of the front end portion of the socket S, that is, when the cap portion 3 is positioned at the mounting position, the connecting arm portion 4 is elastically deformed into a substantially “<” shape.

  For example, when a plug (not shown) provided in the gas stopper G shown in FIG. 7 is connected to the socket S to which the dustproof lid 1 having the above structure is attached, as shown in FIG. It is assumed that it is fitted to the outer periphery of the tip of S and is located at the mounting position. In order to connect the plug to the socket S from this state, the cap portion 3 is first moved to the front side in the direction of the axis L of the socket S (left side in FIG. 4), and removed from the socket S and removed as shown in FIG. To position. Thereafter, as shown in FIG. 6, the cap portion 3 is moved in a direction orthogonal to the axis L of the socket S, and the entire cap portion 3 is separated from the socket S in a direction orthogonal to the axis L (hereinafter, this time) The position of the cap portion 3 is referred to as a separated position). The cap portion 3 does not necessarily have to be entirely separated from the socket S, and may be moved until the plug can be inserted into the connection hole of the socket S. In this embodiment, the cap 3 is moved until the axis of the cap 3 is oriented in a direction perpendicular to the axis L of the socket S. However, the cap 3 is inclined with respect to the axis L of the socket S. You may move only to the extent.

  Next, the plug of the gas plug G is inserted into the connection hole of the socket S. Then, the plug is connected to the socket S so as not to be detached by a known coupling mechanism (not shown) built in the socket S. If the cap part 3 can be moved freely in this state, the cap part 3 is moved in a direction approaching the socket S by the elasticity of the connecting arm part 4. And the cap part 3 hits the gas stopper G and stops.

  When the plug is removed from the socket S, the operation cylinder Sf of the socket S is moved rightward in FIG. Then, the connection state between the socket S and the plug is released, and the plug can be extracted from the socket S. When the plug is removed from the socket S, the cap portion 3 is returned to the removal position shown in FIG. Thereafter, the cap part 3 is moved to the right in FIG. The cap part 3 is moved to the attachment position shown in FIG. As a result, the socket S and the dust cover 1 are returned to the original state.

  As described above, according to the dust cover 1 according to the present invention, when the plug is extracted from the socket S, the cap portion 3 is moved to the removal position by the connecting arm portion 4. When the cap portion 3 is located at the removal position, the cap portion 3 is located in front of the socket S in a state where its axis is aligned with the axis L of the socket S. Therefore, the user may forget to fit the cap portion 3 into the socket S and leave it alone, as compared with the conventional dustproof lid in which the cap portion is supported in a state of being separated from the socket in a direction perpendicular to the axis. Can be significantly reduced. Moreover, the user can fit the cap portion 3 into the socket S simply by moving the cap portion 3 toward the socket S in the direction of the axis L thereof. Therefore, the cap part 3 can be easily fitted into the socket S.

  8 to 18 show a second embodiment of the present invention. In the dustproof lid 1 ′ of this embodiment, two connecting arm portions 4 are provided. The two connecting arm portions 4 are arranged 180 degrees apart from each other in the circumferential direction of the mounting ring portion 2 and the cap portion 3. The connecting arm portion 4 does not extend straight, but extends in a state where a part thereof is bent so as to substantially follow the outer peripheral surface of the socket S. Of course, like the above embodiment, the two connecting portions 4 may be formed immediately and arranged parallel to the axis L of the socket S. Moreover, although the connection arm part 4 is formed in the circular arc shape of a cross section, you may form it in the flat plate shape of a cross-sectional rectangle.

  In the dustproof lid 1 ′ having the above configuration, the mounting ring portion 2 is fitted and fixed to the proximal end portion of the socket S. In this case, the annular recess Sa is not formed on the outer peripheral surface of the base end portion of the socket S, and the attachment ring portion 2 is merely fitted to the outer peripheral surface of the base end portion of the socket S. However, since the inner diameter of the mounting ring portion 2 is smaller than the outer diameter of the base end portion of the socket S, the mounting ring portion 2 is elastically greatly expanded in the state where it is attached to the socket S. The inner peripheral surface of the part 2 is pressed against the outer peripheral surface of the socket S with a large elastic force. Accordingly, a large static frictional resistance is generated between the inner peripheral surface of the mounting ring portion 2 and the outer peripheral surface of the socket S, and the mounting ring portion 2 is fixed to the socket S by the static frictional resistance.

  The socket S to which the dust cover 1 'is attached can be connected to the plug or removed from the socket in the same manner as described above. However, in the case of using the dustproof lid 1 ′, the moving direction is limited when the cap portion 3 is moved from the removed position to the separated position. That is, in the dust-proof lid 1 ′, since the two connecting arm portions 4 are provided, the cap portion 3 cannot be moved in the direction connecting the connecting arm portions 4 and 4. The cap part 3 is moved in a direction orthogonal to the direction connecting the connecting arm parts 4 and 4. In this case, the cap portion 3 may be moved upward as indicated by an arrow in FIG. 16 or may be moved downward. In this embodiment, it is moved downward. Further, as shown in FIG. 17, the cap portion 3 removed from the socket S is in contact with the operation cylinder Sf that has advanced, but it may be in contact with the gas plug G as in the above embodiment. . Conversely, also in the above-described embodiment, the cap portion 3 may be abutted against the operation cylinder Sf.

In addition, this invention is not limited to said embodiment, Various modifications can be employ | adopted.
In the above embodiment, the cap portion 3 fitted to the outer periphery of the front end portion of the socket S is used as a dustproof portion, but the dustproof portion is a disc portion having an outer diameter substantially the same as the outer diameter of the front end portion of the socket. And a projecting portion having a circular cross section formed at the center of one end surface of the disk portion. The projecting portion is press-fitted into the connection hole of the socket so as to be detachable, and the disk portion is inserted into the socket. You may make it press on a front end surface.
In the above embodiment, the cap 3 is configured such that the axis of the cap 3 coincides with the axis L of the socket S when the cap 3 is positioned at the removal position. As long as is opposed to the tip surface Sc of the socket S, the axis of the cap 3 may be eccentric or inclined with respect to the axis L of the socket S.

  The dust-proof lid according to the present invention can be used for a socket defined in Japanese Industrial Standard JIS S 2135.

L axis S socket 1 dustproof lid for gas socket 2 mounting ring (mounting section)
3 Cap part (dustproof part)
4 connecting arms

Claims (3)

A mounting portion attached to the base end portion of the socket, a dust-proof portion that is detachably attached to the tip end portion of the socket, and blocks a connection hole formed in the tip end surface of the socket at the time of mounting, and the dust-proof portion and the mounting portion And the dust-proof portion moves between an attachment position attached to the tip of the socket and a separation position separated from the socket in a direction perpendicular to the axis. In the dustproof lid for the gas socket in which the connecting arm portion is formed so as to be elastically deformable,
A dustproof lid for a gas socket, wherein the dustproof portion is supported by the connecting arm portion in a state of facing the tip end surface of the socket when the dustproof portion is detached from the socket. The dustproof part is formed in a bottomed cylindrical shape, and the dustproof part is detachably attached to the socket by fitting the outer periphery of the tip of the socket in a removable manner from the tip opening of the dustproof part. The dustproof lid for a gas socket according to claim 1. When the dust-proof portion is removed from the socket, the connecting arm portion is in a state where the dust-proof portion has its opening facing the tip end surface of the socket and its axis is aligned with the axis of the socket. The dustproof lid for a gas socket according to claim 2, wherein the dustproof lid is supported by.

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