JP5226482B2 - Dust-proof cap for plug - Google Patents

Description

  The present invention relates to a dust cap for a plug that prevents dust from adhering to a plug of a gas plug or other gas appliance.

  In general, an annular sealing surface is formed on the front end surface of the plug of the gas device, and when the socket is connected to the plug, the plug is inserted into the socket. Then, the sealing surface of the plug is pressed and brought into contact with the distal end portion of the connection tube provided inside the socket. As a result, the socket communicates with the plug via the connection cylinder. In this case, if dust adheres to the sealing surface, the sealing performance between the plug and the connecting tube, and thus between the plug and the socket, is deteriorated. Therefore, in the device described in Patent Document 1 below, when the socket is not connected to the plug, a bottomed cylindrical dust cap is attached to the plug, thereby preventing the dust from adhering to the seal surface of the plug. doing.

Japanese Utility Model Publication No. 7-43874

  However, when the plug is not fitted with a dust cap, for example, after the socket connected to the plug is removed and until the dust cap is fitted to the plug, the seal surface is exposed to the outside. Dust may adhere to the surface. In such a case, even if a dust-proof cap is attached to the socket, the dust remains attached to the sealing surface, and the sealing performance between the plug and the socket is deteriorated at the next connection between the plug and the socket. There was a problem.

In order to solve the above problems, the present invention provides a plug having a bottomed cylindrical cap body having a bottom portion at the base end portion and an opening at the tip end portion, and having an annular sealing surface formed at the tip end portion. In a dustproof cap for a plug that prevents dust from adhering to a seal surface formed on a tip end surface of the plug by being inserted into the cap body up to a predetermined mounting position, the cap body inside the cap body When the cap main body is fitted to the plug, the distal end of the cap abuts against the distal end of the plug, so that the plug enters the cap main body. A brush member that is moved to the proximal end side of the cap body upon insertion, and a biasing hand that biases the brush member from the proximal end side to the distal end side of the cap body And a rotating means for rotating the brush member as the brush member moves. The tip of the brush member is provided with a plug of the plug between the cap body and the brush member. A sliding contact portion that abuts on the seal surface when inserted into the cap body and slides on the seal surface as the brush member rotates is provided.
In this case, the cap body extends spirally along the inner peripheral surface of the cap body, and one end portion on the base end side of the cap body is fixed to the cap body, and the distal end side of the cap body A plurality of supports having the other end thereof fixed to the brush member are provided, and the other end of the support is elastically deformed in the axial direction of the cap body with respect to the one end. It is desirable that the cap body can be elastically deformed so as to be displaced in the circumferential direction, and the biasing means and the rotating means are constituted by the support. In particular, one end of the plurality of supports is provided on the base, and the other end of the plurality of supports is provided on the brush member, and the support, the base, and the brush member are integrally formed of resin. It is desirable that the base is fixed to the cap body.
Preferably, a plurality of the sliding contact portions are provided, and the plurality of sliding contact portions are arranged apart from each other in the circumferential direction on a circumference centering on the axis of the cap body. In particular, the rotation angle of the brush member from when the seal surface contacts the sliding contact portion to when the plug reaches the mounting position is a central angle determined by two sliding contact portions adjacent in the circumferential direction. It is desirable to set a larger angle.

  According to this invention having the above-described characteristic configuration, when the brush member is pressed and moved by the plug when the plug is inserted into the cap body, the brush member is rotated by the rotating means. Then, the sliding contact portion of the brush member slides in the circumferential direction on the seal surface of the plug, and dust attached to the seal surface is scraped off. Further, when the plug is pulled out from the cap body, the brush body is biased by the biasing means, so that the brush body moves together with the plug in a state where the sliding contact portion is pressed against the seal surface. Then, the brush body is rotated by the rotating means along with this movement. Therefore, the sliding contact portion slides on the sealing surface even when the plug is extracted from the cap body. Therefore, dust adhering to the seal surface can be more reliably rubbed off.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 10 show a first embodiment of the present invention. In this embodiment, the present invention is applied to a dust cap 2 attached to a plug portion 12 of a gas plug 1. Of course, the dust cap 2 can also be used for plugs of gas equipment other than the plug 12 of the gas plug 1.

  First, the gas plug 1 will be briefly described. The gas plug 1 has a gas plug body 11. The gas stopper main body 11 is formed with a protruding portion that protrudes from one side portion thereof, and most of the protruding portion on the tip side is a plug 12. Inside the gas stopper main body 11, there are a valve accommodating hole 13, an inflow hole 14 extending from the lower end surface of the gas stopper main body 11 to the bottom surface of the valve accommodating hole 13, and from the inner peripheral surface of the valve accommodating hole 13 to the tip surface of the plug 12. An extending outflow hole 15 is formed. When the valve body 16 rotatably accommodated in the valve accommodation hole 13 is located at the closed position shown in FIG. 2, the gap between the inflow hole 14 and the outflow hole 15 is blocked by the valve body 16, and the gas plug 1 is Closed. When the valve body 16 is rotated from the closed position to the open position by the handle 17, the inflow hole 14 and the outflow hole 15 communicate with each other through the gas passage 16 a formed in the valve body 16, and the gas plug 1 is in the open state. become. When the gas stopper 1 is opened, the gas flowing in from the inflow hole 14 flows out from the outflow hole 15. It is also possible to use the inflow hole 14 as an outflow hole and the outflow hole 15 as an inflow hole.

  The plug 12 has a circular cross section, and the outflow hole 15 extends on the inner axis. An annular engagement groove 12 a is formed on the outer peripheral surface of the plug 12. A tapered sealing surface 12b having a smaller diameter toward the distal end side is formed on the distal end surface of the plug 12 in a state in which the axis line thereof coincides with the axial line of the plug 12. Instead of or together with the sealing surface 12b, another sealing surface may be formed on the tip surface of the plug 12. For example, an annular flat surface 12 c formed outside the seal surface 12 b may be used as the seal surface, or a seal surface may be formed at the intersection 12 d between the tip surface of the plug 12 and the inner peripheral surface of the outflow hole 15.

  Next, the dust cap 2 according to the present invention will be described in detail. The dust cap 2 has a cap body 21 as shown in FIGS. The cap body 21 is made of a material having both predetermined strength and elasticity, such as hard rubber, and has a cylindrical portion 21a and a bottom portion 21b that closes the base end portion (right end portion in FIG. 2) of the cylindrical portion 21a. doing. The inner diameter of the cylindrical portion 21a is set to be substantially the same as the outer diameter of the plug 12 so that the plug 12 can be inserted and removed. One end portion of the connecting band 21c is integrally provided at the proximal end portion of the outer peripheral surface of the cylindrical portion 21a. The other end of the connecting band 21c is rotatably attached to the gas plug main body 11. As a result, the cap body 21 can be rotated with respect to the gas stopper body 11 to be positioned at an appropriate position, and the cap body 21 is detached from the gas stopper body 11 and the dust cap 2 is lost. It can be prevented beforehand.

  On the inner peripheral surface of the cap main body 21, an engagement protrusion 21d that extends in a ring shape in the circumferential direction is formed. The engaging protrusion 21d is disposed so as to fit into the engaging groove 12a of the plug 12 when the plug 12 is inserted into the cap body 21 to a predetermined mounting position. Then, when the engaging protrusion 21d is fitted into the engaging groove 12a, the cap body 21 is mounted on the plug 12 so as not to move with a predetermined amount of force. In the mounted state, the cap body 21 covers the tip of the plug 12 and prevents the dust from adhering to the seal surface 12b.

  As shown in FIGS. 4 and 5, a guide member 22 is inserted into the cap body 21. As shown in FIGS. 4 to 7, the guide member 22 has a bottomed cylindrical shape, and is fitted and fixed to the inner periphery of the cap body 21 with the bottom portion abutting against the bottom portion 21 b of the cap body 21. ing. The guide member 22 may be formed integrally with the cap body 21. That is, the cap body 21 and the guide member 22 may be integrally formed and used as the cap body. A pair of long hole cam holes 22 a are formed in the peripheral wall portion of the guide member 22. The pair of cam holes 22 a extend in a spiral shape and are disposed 180 degrees apart in the circumferential direction of the guide member 22. Only one cam hole 22a may be formed, or three or more cam holes may be formed. Further, the cam hole 22a penetrates the peripheral wall portion of the guide member 22 from the inner peripheral surface to the outer peripheral surface, but it is not necessarily required to penetrate to the outer peripheral surface, and may be formed as a groove on the inner peripheral surface. .

  A brush member 23 is inserted in the inner periphery of the guide member 22 so as to be movable in the axial direction of the guide member 22, that is, in the axial direction of the cap body 21, and rotatable in the circumferential direction of the cap body 21. As shown in FIGS. 4, 5, and 8 to 10, a pair of guide protrusions 23 a are formed on the outer peripheral surface of the rear end portion of the brush member 23. The pair of guide protrusions 23a, 23a are disposed 180 degrees apart in the circumferential direction, and are inserted into the pair of cam holes 22a, 22a of the guide member 22 so as to be slidable in the longitudinal direction. Therefore, when the brush member 23 moves in the guide member 22 in the axial direction, the brush member 23 rotates in the forward and reverse directions according to the moving direction. As is apparent from this, in the dust cap 2 of this embodiment, the rotating means 3 is constituted by the cam hole 22a and the guide projection 23a.

  The brush member 23 is urged from the proximal end side to the distal end side of the cap body 21 by a coil spring (biasing means) 24 disposed between the brush member 23 and the bottom of the guide member 22. Before the dust cap 2 is attached to the plug 12, the brush member 23 is stopped by the guide protrusion 23a being pressed against the inner surface of the tip end portion of the cam hole 22a by the biasing force of the coil spring 24. Hereinafter, the position of the brush member 23 at this time is referred to as an initial position. When the brush member 23 is positioned at the initial position, the tip end surface of the brush member 23 is positioned inside the cap body 21. That is, the cap body 21 is located on the proximal side from the distal end surface.

  When the plug 12 is inserted into the cap main body 21 to a predetermined position in a state where the brush member 23 is located at the initial position, that is, when the plug 12 is inserted to a position at a short distance from the mounting position, the sealing surface 12b of the plug 12 is inserted. Abuts against the front end surface of the brush member 23. Therefore, until the plug 12 reaches the mounting position after the plug 12 hits the brush member 23, the brush member 23 maintains the tip end face against the tip end face of the plug 12, and the biasing force of the coil spring 24 is applied. Accordingly, the cap body 21 is moved to the proximal end side. Hereinafter, the position of the brush member 23 when the plug 12 is inserted to the mounting position is referred to as a terminal position. When the brush member 23 is moved by the plug 12 from the initial position to the terminal position, the brush member 23 is rotated in one direction by the rotating means 3. When the plug 12 positioned at the mounting position is extracted from the cap body 21, the brush member 23 is moved from the terminal position to the initial position by the coil spring 24. At this time, the brush member 23 is rotated in the other direction by the rotating means 3.

  A large number of contact protrusions 23 b are formed on the tip surface of the brush member 23. The contact protrusions 23b are arranged at equal intervals in the circumferential direction of the brush member 23. A sliding contact surface 23c is formed on the front end surface of the contact protrusion 23b. The sliding contact surface 23c is constituted by a part of the same tapered surface as the seal surface 12b. The width of the slidable contact surface 23c in the radial direction of the brush member 23 is the same as or slightly wider than the width of the seal surface 12b so that the slidable contact surface 23c can contact the seal surface 12b from the inner periphery to the outer periphery. Is set. Therefore, when the plug 12 is inserted into the cap body 21, each sliding contact surface 23c contacts the seal surface 12b over its entire width. Then, the sliding contact surface 23 c is pushed by the seal surface 12 b, and the brush member 23 is moved to the proximal end side of the cap body 21 by the plug 12. In this embodiment, only the sliding contact surface 23c of the brush member 23 is in contact with the plug 12. However, in the case where another seal surface is formed on the plug 12 in addition to the seal surface 12b, A sliding contact surface in contact with the sealing surface is also formed on the brush member 23.

  A circumferential interval between two sliding contact surfaces 23c, 23c adjacent in the circumferential direction, that is, a line passing through the axis of the brush member 23 and the circumferential center of the two sliding contact surfaces 23c, 23c is formed. The central angle α (see FIG. 9) is set to an angle smaller than the rotation angle at which the brush member 23 is rotated by the rotation means 3 while the brush member 23 moves between the initial position and the end position. Therefore, when the brush member 23 is moved from the initial position to the end position by the plug 12, the entire seal surface 12b is rubbed against the slidable contact surface 23c.

  In the dust cap 2 having the above configuration, it is assumed that the plug 12 is not inserted into the cap body 21 as shown in FIGS. At this time, the brush member 23 is located at the initial position. When the plug 12 is inserted into the cap body 21 to a predetermined position, the seal surface 12b hits the sliding contact surface 23c. Therefore, when the plug 12 is further inserted. The brush member 23 is moved from the initial position to the end position side. Accordingly, the brush member 23 is rotated. Then, the sliding contact surface 23c slides on the seal surface 12b. Therefore, dust adhering to the seal surface 12b is scraped off by the sliding surface 23c. Moreover, since the entire seal surface 12b is abraded by the sliding contact surface 23c while the brush member 23 moves from the initial position to the end position, dust is scraped off from the entire seal surface 12b. Therefore, when the socket is attached to the plug 12 next time, it is possible to prevent dust from interposing between the contact surface between the sealing surface 12b of the plug 12 and the socket. Even when the plug 12 is extracted from the cap body 21, the seal surface 12b is scratched by the sliding contact surface 23c. Therefore, the dust adhering to the seal surface 12b can be more reliably scraped off.

  Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same components as those in the above embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  11 to 17 show a second embodiment of the present invention. In the dustproof cap 2A of this embodiment, the cap body 21 and the guide member 22 are made of hard resin. Further, the guide member 22 is formed as a cylindrical body having both ends opened, and the base end portion thereof is fitted and fixed to the base end portion of the inner peripheral surface of the cap body 21. Of course, also in this embodiment, the cap body 21 and the guide member 22 may be integrally formed and used as the cap body. This is also clear from the fact that in this embodiment, the plug 12 is inserted into the guide member 22, that is, the plug 12 is inserted into the cap body 21 via the guide member 22.

  In this embodiment, the sphere 4 is used instead of the engagement protrusion 21d of the above embodiment, and the plug 12 and the guide member 22 are locked by the sphere 4. Since this locking mechanism is well known, its structure will be briefly described. As shown in FIGS. 11 and 12, the distal end portion of the peripheral wall portion of the guide member 22 is provided with a plurality of spaces spaced at equal intervals in the circumferential direction. Through-holes 22b are formed. The spherical body 4 is inserted into the through hole 22b so as to be movable in the axial direction of the through hole 22b and immovable in the radial direction. As shown in FIG. 11, when the brush member 23 is positioned at the initial position, the outer peripheral surface of the brush member 23 abuts on the inner end of the sphere 4, and the outer end of the sphere 4 is moved to the outer periphery of the guide member 22. It protrudes outward from the surface. As shown in FIG. 11, when the plug 12 is inserted into the guide member 22 to the mounting position, and thereby the brush member 23 is moved to the terminal position, the brush member 23 is moved from the through hole 22 b to the proximal end side of the cap body 21. It separates and the spherical body 4 becomes movable inside. When the sphere 4 moves inward, the inner end of the sphere 4 fits into the engagement groove 12a, and the plug 12 and the guide member 22 are locked so as not to move in the axial direction of each other.

  An operation tube 25 is slidably provided on the outer peripheral surface of the guide member 22. The operation cylinder 25 is urged toward the distal end side of the cap body 21 by a coil spring 26. As shown in FIG. 11, when the brush member 23 is located at the initial position, the annular contact surface 25 a formed on the inner peripheral surface of the operation cylinder 25 hits the sphere 4 and stops. On the other hand, when the brush member 23 moves to the end position, as shown in FIG. 12, the operation cylinder 25 is moved to the tip end side of the cap body 21 by the coil spring 26, and the annular contact surface 25a causes the spherical body 4 to move to the guide member. 22 is moved toward the inside of the engagement groove 12a. In addition, the operation cylinder 25 stops when the annular contact surface 25 a abuts against the annular protrusion 22 c formed on the outer peripheral surface of the distal end portion of the guide member 22. In this state, the sphere 4 is prevented from moving outward in the radial direction, and a state in which a part of the inside of the sphere 4 is fitted in the engagement groove 12a is maintained. As a result, the plug 12 is maintained inserted in the cap body 21.

  When the operation cylinder 25 is returned to the position shown in FIG. 11 against the urging force of the coil spring 26 in a state where the plug 12 is inserted into the cap body 21, the sphere 4 can move outward and the engagement groove 12a. Escape from. As a result, the plug 12 can escape from the guide member 22. When the plug 12 is extracted from the guide member 22, the brush member 23 returns from the terminal position to the initial position and stops. Thereafter, when the hand is released from the operation tube 25, the annular contact surface 25a is abutted against the spherical body 4 by the coil spring 26, and the operation tube 25 is maintained at the original position shown in FIG.

  A through hole 23d is formed in the central portion of the brush member 23 so as to penetrate the brush member 23 in the axial direction. The through hole 23d is provided so as to be movable within a predetermined range in a state where the valve body 5 is prevented from coming off. The valve body 5 is made of a relatively hard and elastic material such as hard rubber. A tapered surface 51 is formed on the distal end surface of the valve body 5. As shown in FIG. 12, the taper surface 51 has such a dimension that the intermediate portion in the radial direction presses against the intersecting portion between the tip end surface and the inner peripheral surface of the plug 12 in an annular shape. On the other hand, a pressing projection 21e is formed at the center of the bottom 21b of the cap body 21 that faces the valve body 5. When the plug 12 is inserted into the guide member 22 to the mounting position, the pressing protrusion 21e hits the base end surface of the valve body 5, and is a tapered surface in a state in which the valve body 5 is elastically compressed and deformed in the axial direction. 51 is abutted against the intersection of the plug 12.

  An annular protrusion 23 e is formed on the tip surface of the brush member 23. The annular protrusion 23a is formed integrally with the outer periphery of the contact protrusion 23b. Thereby, the spherical body 4 is prevented from entering between the two contact protrusions 23b, 23b adjacent in the circumferential direction, and each contact protrusion 23b is reinforced.

  In the dust cap 2 </ b> A having the above configuration, when the plug 12 is inserted into the cap main body 21 (guide member 22) to the mounting position, the sphere 4 is fitted into the engagement groove 12 a of the plug 12 and the plug 12 is locked to the guide member 22. . In this state, the plug 12 does not come out of the cap body 21 unless the operation tube 25 is moved to the proximal end side of the cap body 21. Therefore, the cap 2A can be securely attached to the plug 12. When the plug 12 is inserted into the cap body 21, the valve body 5 moves to the proximal end side of the cap body 21 together with the brush member 23, and the proximal end surface of the valve body 5 is pressed immediately before the plug 12 reaches the mounting position. It strikes against the protrusion 21e. Therefore, when the plug 12 is inserted to the mounting position, the tapered surface 51 of the valve body 5 is pressed against the intersecting portion of the plug 12 with the pressing protrusion 21e elastically deforming the valve body 5. As a result, the opening of the plug 12 is closed by the valve body 5. Therefore, gas leakage from the outflow hole 15 can be prevented.

  18 and 19 show a third embodiment of the present invention. In the dustproof cap 2B of this embodiment, a coil spring 6 serving as an urging means is provided instead of the pressing protrusion 21e. The coil spring 6 comes into contact with the base end surface of the valve body 5 and urges the valve body 5 toward the distal end side when the plug 12 is inserted to a position a short distance from the mounting position. Yes. Therefore, when the plug 12 is inserted to the mounting position, the coil spring 6 presses the valve body 5 against the intersection of the plug 12. The coil spring 6 may bias the valve body 5 from the beginning when the brush member 23 is located at the initial position.

  20 and 21 show a fourth embodiment of the present invention. In the dust cap 2C of this embodiment, a single tubular member 30 is used instead of the guide member 22, the brush member 23, and the coil spring 26 of the first embodiment. The entire cylindrical member 30 is integrally formed of resin, and is inserted into the cap body 21 with its axis line coincided with the axis line of the cap body 21. The cylindrical member 30 includes a base portion 31, a plurality of support portions (support bodies) 32, and a brush portion (brush member) 33 that are sequentially arranged from the base end side to the distal end side of the cap body 21. The base 31, the support 32, and the brush 33 may be formed separately from each other and fixed to each other.

  The base portion 31 is formed in a disc shape or a ring shape, and is inserted into the base end portion of the cap body 21 so as not to move in the axial direction. In addition, the base 31 is prevented from rotating by a projection 21 f provided on the bottom 21 b of the cap body 21. Therefore, the base 31 is provided in a substantially fixed state on the cap body 21.

  The plurality of support portions 32 extend in a spiral shape with the same twist angle in the same direction along the inner peripheral surface of the cap body 21. One end portion of the support portion 32 located on the base end side of the cap body 21 is provided integrally with the base portion 31. The other end of the support portion 32 is provided integrally with the brush portion 33. The support portion 32 is formed to be elastically deformable, and when the brush portion 33 moves in the axial direction of the cap body 21, it elastically deforms so that the twist angle changes correspondingly. When the support portion is elastically deformed in such a manner, one end portion of the support portion 32 is fixed to the cap body 21, so that the other end portion of the support portion 32 is rotationally displaced in the circumferential direction of the cap body 21 relative to the one end portion ( Moving. As a result, the brush part 33 rotates.

  The brush portion 33 has substantially the same shape as the portion of the brush member 23 according to the first embodiment that is located on the distal end side of the cap body 21 from the portion where the coil spring 24 abuts. Therefore, a contact protrusion 33 a and a slide surface 33 b corresponding to the contact protrusion 23 b and the slide surface 23 c of the brush member 23 are formed on the tip surface of the brush portion 33. Of course, the sliding surface 33b hits the sealing surface 12b of the plug 12 when the plug 12 is inserted into the cap body 21 to a predetermined position. Therefore, when the plug 12 is further inserted to the mounting position, the brush portion 33 is pressed and moved to the proximal end side of the cap body 21 by the plug 12. Of course, at this time, the support portion 32 is elastically compressed and deformed. When the plug 12 is extracted from the cap body 21, the brush portion 33 is returned to the original position by the elastic force of the support portion 32. Moreover, the brush portion 32 is rotated by the support portion 32 as the cap body 21 moves in the axial direction. As is clear from this, in this embodiment, the support portion 32 is used as the urging means and the rotating means. Note that the inner diameter of the cap body 21 is set to be substantially the same as the outer diameter of the plug 12.

  In the dustproof cap 2C having the above-described configuration, as described above, when the plug 12 is inserted into and removed from the cap body 21, the support portion 32 is elastically deformed, so that the brush portion 33 is moved in the axial direction of the cap body 21. Moved. At this time, the support portion 32 is elastically deformed so that its twist angle changes. That is, the support portion 32 is elastically deformed in the circumferential direction simultaneously with the elastic deformation in the axial direction of the cap body 21. In addition, one end of the support portion 32 located on the base end side of the cap body 21 is fixed to the cap body 21. Therefore, when the support portion 32 is elastically deformed, the other end portion of the support portion 32 moves in the circumferential direction while moving in the axial direction of the cap body 21. As a result, the brush portion 33 rotates while moving in the axial direction of the cap body 21. Therefore, the sliding surface 33b of the brush portion 33 slides on the seal surface 12b of the plug 12, and dust adhering to the seal surface 12b is scraped off.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above-described embodiment, the rotating means 3 is constituted by the cam hole 22a and the guide protrusion 23a. However, it is possible to adopt a rotating means having another known structure.
Further, in the above-described embodiment, the plurality of sliding contact surfaces 23c and 33b that are spaced apart from each other in the circumferential direction are formed. However, the sliding contact surfaces 23c and 33b may be formed annularly in a continuous manner in the circumferential direction. Good.
Furthermore, the slidable contact surfaces 23c and 33b which are slidable contact portions are constituted by a part of the tapered surface. That is, it is formed as a surface. However, you may form in a linear form or a brush form, without forming as a surface. Further, the sliding contact portion may be formed separately from the brush member 23 or the brush portion 33 and fixed to the brush member 23 or the brush portion 33. In such a case, it is desirable that the sliding contact portion is made of hard rubber, a sponge-like porous material, or the like.

1 is a front view showing a gas stopper equipped with a dustproof cap according to a first embodiment of the present invention. It is a front sectional view showing the same gas stopper in the state before attaching a dustproof cap to the plug. It is a front sectional view showing the same gas stopper in the state where a dustproof cap is attached to the plug. It is an expanded sectional view which shows the plug and dustproof cap of the same gas stopper in the state before attaching a dustproof cap to a plug. It is an expanded sectional view which shows the plug and dustproof cap of the same gas stopper in the state which attached the dustproof cap to the plug. It is a front view which shows the guide member currently used in the gas stopper. It is sectional drawing which follows the XX line of FIG. It is a front view which shows the brush member currently used in the gas stopper. It is a left view of the brush. It is sectional drawing which follows the XX line of FIG. It is a front sectional view showing a second embodiment of a dust cap for a gas stopper according to the present invention in a state before the plug is attached. It is a front sectional view showing the second embodiment with a plug attached. It is a front view which shows the guide member used in the embodiment. It is a right view of the same guide member. It is a front view which shows the brush member used in the embodiment. It is a left view of the brush member. It is sectional drawing which follows the XX line of FIG. It is a front sectional view showing a third embodiment of a dust cap for a gas stopper according to the present invention in a state before the plug is attached. It is a front sectional view showing the third embodiment with a plug attached. It is a front sectional view showing a fourth embodiment of a dust cap for a gas stopper according to the present invention in a state before the plug is attached. It is a front sectional view showing the same 4th embodiment in the state where a plug was installed.

Explanation of symbols

2 Dust cap 2A Dust cap 2B Dust cap 2C Dust cap 3 Rotating means 12 Plug 12b Seal surface 21 Cap body 23 Brush member 23c Sliding contact surface (sliding contact portion)
24 Coil spring 32 Support part (support body)
33 Brush part (brush member)

Claims (5)

A plug with a bottomed cylindrical cap body having a bottom at the base end and an open end is inserted, and a plug having an annular sealing surface formed at the distal end is inserted into the cap body to a predetermined mounting position. In the dustproof cap for plugs that prevents dust from adhering to the sealing surface of the plug,
It is provided inside the cap body so as to be movable and rotatable in the axial direction of the cap body, and when the cap body is fitted to the plug, the tip end portion abuts against the sealing surface of the plug. A brush member that is moved to the proximal end side of the cap body as the plug is inserted into the cap body, and a biasing member that biases the brush member from the proximal end side to the distal end side of the cap body. And a force means,
Between the cap body and the brush member, a rotating means for rotating the brush member as the brush member moves is provided,
The tip of the brush member is provided with a sliding contact portion that contacts the seal surface when the plug is inserted into the cap body and slides on the seal surface as the brush member rotates. A dustproof cap for plugs. Inside the cap body, spirally extends along the inner peripheral surface of the cap body, one end on the proximal end side of the cap body is fixed to the cap body, and the other end on the distal end side of the cap body A plurality of supports having a portion fixed to the brush member are provided, and the other end of the cap body of the cap body is elastically deformed in the axial direction of the cap body. 2. The dustproof cap for a plug according to claim 1, wherein the urging means and the rotating means are configured by the support so as to be elastically deformable so as to be displaced in the circumferential direction.   One end of the plurality of supports is provided on the base, the other end of the plurality of supports is provided on the brush member, and the support, the base, and the brush member are integrally formed of resin, The dust cap for a plug according to claim 2, wherein the base is fixed to the cap body. A plurality of the sliding contact portions are provided, and the plurality of sliding contact portions are arranged apart from each other in a circumferential direction on a circumference centering on an axis of the cap body. A dust cap for a plug according to any one of the above.   The angle at which the brush member rotates between the time when the seal surface comes into contact with the sliding contact portion and the time when the plug reaches the mounting position is determined by a central angle determined by two sliding contact portions adjacent in the circumferential direction. The dustproof cap for plugs according to claim 4, wherein the dustproof cap is set at a large angle.

Images