JP2010025192A - Gas cock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the waterproofness of a space S3 surrounded by a back surface of an operation handle 2 and a top surface 36 of a cock 3 and a cylindrical part 33, and to maintain permeability for a long time in a gas cock wherein the cock 3 is stored in a cock storage part 30 so as to turn freely, and the operation handle 2 for turning the cock 3 is attached to the cylindrical part 33 continued to an opening end of the cock storage part 30 through a waterproofing packing 10 so as to relatively turn. <P>SOLUTION: A skirt 24 covering an outer periphery of the cylindrical part 33 is disposed on the back surface of the operation handle 2, the waterproofing packing 10 is made to pressure-contacte between an outer periphery of an opening end of the cylindrical part 33 and an inner peripheral surface of the skirt 24, a through-hole 11 penetrates a wall constituting the cylindrical part 33 in a region covered by the skirt 24, and at least a part of the through-hole 11 is opened to a region on which the waterproofing packing 10 is not attached, and a water impermeable ventilating member 1 is filled in the through-hole 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas stopper, and more particularly to a gas stopper having a structure in which a waterproof packing is provided between a gas stopper body and an operation handle.

In general, as shown in FIG. 5, the gas stopper is formed with a thread accommodating portion (30) that opens upward in the drawing in the center of the gas flow path (31a) inserted through the gas stopper main body (31). In addition, a truncated cone-shaped thread (3) that can be rotated by rotating the operation handle (2) is accommodated in the thread accommodating part (30). The inner peripheral surface of the thread accommodating portion (30) and the outer peripheral surface of the thread (3) are in a mutually sliding relationship via the sliding portion (35).
Further, the gas passage hole (3a) passes through the thread (3), and when the thread (3) is rotated 90 degrees by operating the operation handle (2) from the fully opened state shown in FIG. The gas flow path (31a) and the gas passage hole (3a) are in a fully closed state where they intersect at a right angle.

A cylindrical portion (33) is coaxially extended upward at the upper end opening portion of the screw housing portion (30), and the open end portion of the cylindrical portion (33) is provided on the back surface of the operation handle (2). At the same time that it fits into the annular groove (23), it projects in the center of the top surface (36) of the thread (3) in the recess (22) provided in the center of the back of the operation handle (2). The shaft (32) is fitted into the relative rotation blocking state. As a result, the operation handle (2) is mounted so as to be rotatable relative to the cylindrical portion (33), and the screw (3) rotates together with the operation handle (2) to rotate the operation handle (2). By moving, the gas passage (31a) can be opened and closed by rotating the thread (3).
In addition, between the circumference of the operation shaft (32) of the thread (3) in the gas plug body (31) and the back surface of the operation handle (2), place the thread (3) in the thread housing part (30). A presser spring (4) for pressing is interposed in a compressed state, and the thread (3) is accommodated while being pushed into the thread accommodating part (30) by the urging force of the presser spring (4).

Gas plugs for gas meters installed outdoors and gas plugs installed in commercial kitchens are in an environment where water can easily enter the gas plug main body (31) due to rain water, water sprinkling, or the like. When water enters the gas plug main body (31), rust is generated in the gas plug main body (31) and the sliding part (35) becomes rusted. ) Sticks, and there is a problem that the operation of the screw (3) cannot be performed. Therefore, in this type of gas stopper, it is necessary to reliably prevent water from entering the gas stopper body (31).
For this purpose, in the one shown in the figure, a waterproof packing (20) is provided in the annular groove (23), and the waterproof packing (20) includes an upper end of the cylindrical portion (33) and a back surface of the operation handle (2). A grease layer (45) for lubrication and sealing is provided over the entire upper end of the sliding part (35) between the thread (3) and the thread housing part (30). Yes.

In this way, the waterproof packing (20) prevents rain water or water from entering the gas plug body (31) from the gap between the cylindrical portion (33) and the operation handle (2). In addition, the grease layer (45) prevents the sliding portion (35) from being rusted. Thereby, generation | occurrence | production of the rust in a gas stopper main body (31) can be prevented, and the sticking of the screw | thread (3) by rust and the operation failure of the operation handle (2) accompanying it can be prevented.
As described above, in the gas stopper provided with the waterproof packing (20) and the grease layer (45), the inner peripheral surface of the cylindrical portion (33), the top surface (36) of the thread (3), and the operation handle The space surrounded by the back surface of (2) becomes a sealed airtight space (S).

  A gas stopper having such an airtight space (S), which is used for a gas meter for a gas meter installed outdoors due to a rise in the outside air temperature, and for a gas stopper used in a kitchen, near the gas stopper. When the temperature around the gas plug rises due to the use of the heating device, the temperature in the airtight space (S) rises. Accordingly, the inside of the airtight space (S) is pressurized and expands, and the pressure applied to the top surface (36) of the thread (3) increases. In this case, a force is applied to the thread (3) in a direction in which it is pushed down to the bottom side of the thread accommodating part (30).

  In this way, when the pressure applied to the thread (3) increases due to an increase in the temperature of the gas stopper, the thread (3) is pressurized. It becomes difficult to rotate, and smooth operation of the gas stopper becomes difficult.

In view of this, there is an invention disclosed in Japanese Patent Application Laid-Open No. 2005-195055 in which the above airtight space (S) is not generated.
In this case, as shown in FIG. 6, the screw (3) in the screw container (30) of the gas plug main body (31) and the operation handle (2) are connected via a drive shaft (40). The drive shaft (40) and the operation handle (2) are screwed with a screw (41) to prevent relative rotation.

A screw hole (42) into which the screw (41) can be screwed penetrates in the vertical center of the operation handle (2), and the outer peripheral surface of the cylindrical portion (33) of the gas plug main body (31) and the screw hole (42). A waterproof packing (20) is interposed between the covering operation handle (2) and the skirt portion (24).
In this conventional gas plug, the upper open portion of the screw hole (42) is filled with a non-water-permeable ventilation member (44).

The ventilation member (44) is not permeable to water but is made of a material having air permeability.Therefore, the ventilation member (44) has water in the space (S2) below the back surface of the operation handle (2) through the ventilation member (44). However, the air does not enter through the ventilation member (44), the gap between the screw (41) and the screw hole (42), and the periphery of the shaft portion (43) of the drive shaft (40). Communication with the outside is possible. As described above, since the space (S2) is not maintained in an airtight state, in the configuration in which the ventilation member (44) is provided on the operation handle (2), the temperature outside the gas plug increases. However, the inside of the space (S2) is not pressurized, and the pressure pushed downward does not act on the thread (3). Therefore, there is no inconvenience that the thread (3) is fixed in the thread housing part (30) by pressurization and the operability is deteriorated.
JP 2005-195055 A

  However, in the above configuration, since the open end portion of the screw hole (42) of the operation handle (2) is filled with the ventilation member (44), the gas plug is connected to the outdoor pipe as well as the gas plug for the gas meter. When the entire surface is coated for rust prevention, the outer surface of the ventilation member (44) is also covered with the coating member, and the air permeability of the ventilation member (44) is lost. In addition, in the case of a gas stopper provided indoors or in a kitchen, dust, oil, detergent or the like adheres to the outer surface of the ventilation member (44), and the ventilation member (44) is clogged. Breathability is lost.

  Therefore, with the above configuration, it is difficult to ensure air permeability over a long period of time in the space (S2) between the thread (3) and the back surface of the operation handle (2), and the ventilation member (44) If clogged with paint, dust or the like, the space (S2) becomes a sealed airtight space (S) as in the case of FIG. As described above, even in the invention shown in FIG. 6, the pressure applied to the thread (3) fluctuates due to a change in the temperature around the gas stopper, and in some cases, it is difficult to rotate the thread (3). Insufficient to resolve.

  According to the present invention, “a gas opening for opening and closing the gas flow path is rotatably accommodated through a sliding portion in a gas accommodating portion that opens to one side of the gas plug main body, In the gas stopper, in which the cylindrical portion is continuously provided on the same axis, and an operation handle for rotating the screw is attached to the cylindrical portion via a waterproof packing so as to be relatively rotatable. It is an object of the present invention to maintain air permeability for a long period of time while ensuring the waterproofness of the space surrounded by the back surface of the handle, the top surface of the thread and the cylindrical portion.

(1) The solving means of the present invention taken in order to solve the above-mentioned problem is as follows: “A skirt portion is provided on the back surface of the operation handle to cover the outer periphery of the cylindrical portion;
The waterproof packing is provided between the outer periphery of the open end of the cylindrical portion and the inner peripheral surface of the skirt portion,
A through-hole penetrating the constituent wall of the cylindrical portion is formed at a predetermined position of the cylindrical portion covered with the skirt portion,
At least a part of the through hole is open to a non-mounting area of the waterproof packing, and the through hole is filled with a non-water-permeable ventilation member.
The technical means operates as follows.
The gas plug body has a configuration in which a cylindrical portion is continuously provided from the open end of the thread accommodating portion. The outer periphery of the cylindrical portion is covered with a skirt portion of the operating handle. It is mounted so that it can rotate freely. Since a waterproof packing is provided between the outer periphery of the open end of the cylindrical portion and the skirt portion, water does not enter the cylindrical portion through the gap between the skirt portion and the cylindrical portion. Therefore, the waterproofness in the gas plug body is ensured.
Further, a through hole is formed in the cylindrical portion, and the through hole is filled with a non-water-permeable ventilation member. The through hole is provided in a range of the cylindrical portion covered with the skirt portion of the operation handle, and at least a part of the through hole is set not to be covered with the waterproof packing. Is not sealed by the waterproof packing, and at least a part thereof is open to the gap between the cylindrical portion and the skirt portion.
Therefore, when the through-hole is filled with a ventilation member, the ventilation member is non-water-permeable, and therefore, it is possible to prevent liquid such as water from entering the cylindrical portion from the ventilation member. Further, since at least a part thereof is open to the gap between the cylindrical portion and the skirt portion, air can be vented through the gap. Therefore, ventilation is ensured in the space surrounded by the back surface of the operation handle, the top surface of the thread, and the cylindrical portion while having a waterproof function. Moreover, the outer surface of the ventilation member is covered with a skirt portion and is not exposed to the outside of the gas stopper.

(2) The gas stopper of the invention according to claim 2 is the gas stopper according to claim 1, wherein the waterproof packing is an annular flange piece that is in close contact with an open end surface of the cylindrical portion, and an outer peripheral surface of the cylindrical portion. Is formed in a substantially inverted L-shaped cross section from the peripheral wall portion closely contacting with
The peripheral wall portion covers the outer surface of the ventilation member in the through hole in a non-contact state ”, and the outer surface of the ventilation member filled in the through hole has a peripheral wall portion of the waterproof packing. Since the inner surface is coated without being in close contact, the outer surface of the ventilation member is protected by the peripheral wall portion of the waterproof packing while maintaining the air permeability of the ventilation member.

(3) The gas plug of the invention according to claim 3 is the gas plug according to claim 1 or 2, wherein the ventilation member is made of a metal sintered body. The sintered body is formed in a cross-sectional shape that substantially matches the size and shape of the through hole, and the sintered body is forcibly pressed into the through hole, thereby filling the through hole with the sintered body. Can do.

(4) The gas plug of the invention according to claim 4 is the gas plug according to claim 3, wherein an annular groove portion having the skirt portion as an outer peripheral wall is formed on the back surface of the operation handle,
A range including the through hole of the cylindrical portion is rotatably accommodated in the annular groove portion,
In a predetermined position corresponding to the through hole in the inner peripheral wall of the annular groove portion, a circumferential groove portion opened in the annular groove portion is formed in the circumferential direction,
The ventilation member is press-fitted into the through-hole, and its tip is inserted into the circumferential groove and is engaged in the groove width direction ”. The gas is introduced into the annular groove provided in the operation handle. The cylindrical part of the stopper main body is accommodated, and the through hole provided in the cylindrical part is made to correspond to the circumferential groove part in the annular groove part. And while pressing the metal sintered compact as a ventilation member into a through-hole, the front-end | tip part is inserted in a circumferential groove part. Then, the front end portion of the ventilation member engages with the circumferential groove portion in the groove width direction.
Thereby, in addition to the normal removal prevention structure, the operation handle is provided with a removal prevention structure by the ventilation member, so that the safety is improved.

(5) The gas plug of the invention according to claim 5 is the gas plug according to any one of the above claims, wherein a grease layer is provided on a peripheral edge of the top surface of the spiral following the sliding portion, The grease layer is covered with an annular protective cover, and the through-hole is formed closer to the open end of the cylindrical portion than the protective cover. ” Rust prevention of moving parts is ensured. Further, since the grease layer is covered with a protective cover, the grease layer does not flow toward the open end of the cylindrical portion regardless of the direction of the gas stopper.

According to the first aspect of the present invention, the space surrounded by the back surface of the operation handle, the top surface of the thread, and the cylindrical portion can be vented to the outside through the ventilation member. Even if the temperature changes, the pressure in the space does not fluctuate. Thereby, since the pressure applied to the top surface of the thread does not fluctuate, it is possible to prevent the disadvantage that the thread is pressurized and fixed in the thread accommodating portion, making it difficult to open and close the gas stopper.
In addition, since the ventilation member is covered with the skirt part of the operation handle, in the case of a gas stopper for an outdoor gas meter, even if the entire gas stopper is painted together with the piping, the paint is inside the skirt part. Never invade. Therefore, there is no inconvenience that the outer surface of the ventilation member is clogged with the paint. Similarly, in the case of a gas plug for a kitchen, it is possible to prevent dust, oil, detergent or the like from adhering to the outer surface of the ventilation member.
In addition, in the gas stopper having a structure in which the space is sealed, after the gas stopper is assembled, the gas leakage from the sliding portion of the screw cannot be detected from the outside, so to check the gas leakage, Once the operation handle is assembled to the cylinder without waterproof packing and leakage inspection is performed, if there is no abnormality, remove the operation handle, attach the waterproof packing, and then reassemble the operation handle to the cylinder. It was. As described above, in the conventional gas stopper in which the space is sealed, in order to perform the gas leak inspection, the assembly process is required twice. In addition, the gas leak inspection can be performed even after the gas stopper is assembled, the reassembly process after the inspection is not required, and the gas leak inspection process can be simplified.

  According to the invention of claim 2, since the outer surface of the ventilation member filled in the through hole is covered with the peripheral wall portion of the waterproof packing, the outer surface of the ventilation member is waterproof with the skirt portion of the operation handle. Double protection is provided with the peripheral wall of the packing. Therefore, clogging of the ventilation member due to adhesion of paint or oil can be more reliably prevented. Since the waterproof packing is not in close contact with the ventilation member, there is no problem with the ventilation property of the ventilation member.

  According to the invention of claim 3, in addition to the breathability and water repellency of the ventilation member, heat resistance, corrosion resistance and weather resistance can be expected, and machining of the ventilation member can be performed according to the size and shape of the through hole. It is free.

  According to the invention of claim 4, in addition to the effect of the invention of claim 3, the ventilation member can also be used as a retaining member for the operation handle, and the safety of the gas plug can be improved. .

  Further, according to the invention according to claim 5, since the grease layer ensures the rust prevention of the sliding portion of the spiral housing portion, the pivoting operation of the spiral is made more reliable and smooth. Become. In addition, since the grease layer covered with the protective cover does not flow toward the open end of the cylindrical portion, the grease layer does not reach the through hole, and the ventilation member is clogged with grease. There is no.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a gas stopper according to a first embodiment of the present invention, and FIG. 2 is a main part of a mounting portion for a waterproof packing (10) and a ventilation member (1) in the gas stopper of FIG. It is an expanded sectional view.
As shown in FIG. 1, the gas stopper main body (31) of this embodiment is open upward in the drawing and has a screw storage portion (30) for storing a screw (3) having an inverted frustoconical shape. ) And a cylindrical portion (33) continuous to the open end thereof, and the thread accommodating portion (30) communicates with the gas flow path (31a) of the gas plug body (31). In addition, a gas passage hole (3a) communicating with the gas flow path (31a) passes through the thread (3).

  When the thread (3) is housed in the thread housing part (30), the inner peripheral surface of the thread housing part (30) and the outer peripheral surface of the thread (3) are slidable sliding parts ( 35), and the periphery of the top surface (36) of the thread (3) corresponding to the upper end of the sliding part (35) located above the gas passage hole (3a) is used for lubrication and sealing. Grease is applied to form a grease layer (45), which reliably prevents water droplets, detergent, dust and the like from entering the sliding portion (35). The entire area of the grease layer (45) is covered with an annular protective cover (46) made of an elastic material such as a synthetic resin or rubber to prevent the grease from flowing out from the grease layer (45) to other places. Yes.

The open end of the cylindrical portion (33) is an annular thin portion (33a) that is thinner than the base end side, and the operation handle (2) is rotatably attached to the annular thin portion (33a). Is done.
Incidentally, in the vicinity of the base end portion of the annular thin portion (33a), as shown in FIG. 2, a through hole (11) penetrates at one place or a plurality of places. The through hole (11) is formed in a stepped shape in which the outer peripheral surface (38) side of the annular thin part (33a) is a large diameter hole, and the through hole (11) has no water permeability but has air permeability. A vent member (1) having a certain property is fitted.

As the ventilation member (1), a metal sintered body can be adopted, and in particular, it has good air permeability, strong water repellency, and is excellent in corrosion resistance and heat resistance. The sintered body is preferable.
In a state where the ventilation member (1) is press-fitted into the through hole (11) from the outside of the annular thin portion (33a), the outer surface (12) on the large-diameter shaft side of the ventilation member (1) is an annular thin portion. The dimension is set so as to be located slightly behind the outer peripheral surface (38) of (33a).

With the through hole (11) filled with the ventilation member (1), the annular groove (23) of the operation handle (2) is fitted into the annular thin wall portion (33a), and the operation handle (2) is attached to the gas plug body ( Attach to 31).
As shown in FIG. 1 described above, a concave portion (22) is provided in the center of the back surface of the operation handle (2), and the collars (26) and (26) are directed outward from a plurality of surrounding locations. Projecting.
The flanges (26) and (26) are engaged from below with engagement flanges (34) partially projecting inward from the base end of the annular thin part (33a), and the thread (3 A pair of operation shafts (32) projecting from the center of the top surface (36) of the operation handle (2) is fitted into the recess (22) at the center of the back surface of the operation handle (2) in a state of preventing relative rotation. As a result, the operation handle (2) can be rotated relative to the cylindrical portion (33) and attached in a retaining state, and the operation handle (2) can be rotated so that the screw (3) is shared. The gas channel (31a) can be opened and closed. A presser spring (4) for pushing the screw (3) into the screw housing portion (30) is interposed between the operation shaft (32) and the back surface of the operation handle (2).

   An annular skirt portion (24) covering the outer peripheral surface (38) of the annular thin portion (33a) is suspended on the outer peripheral side of the flanges (26) and (26) on the back surface of the operation handle (2). An annular groove (23) that can accommodate the annular thin portion (33a) is formed inside the skirt portion (24). A waterproof packing (10) is attached so as to cover the outer peripheral surface (38) from the open end surface (37) of the annular thin portion (33a).

  As shown in FIG. 2, the waterproof packing (10) includes a peripheral wall portion (18) that is in close contact with the outer peripheral surface (38) of the annular thin portion (33a), and an inward extension from the upper end of the peripheral wall portion (18). A thin annular body made of synthetic rubber having a substantially inverted L-shaped cross section from an annular flange piece (17) formed and closely attached to an open end face (37) of the annular thin part (33a), the annular flange piece The upper annular rib (15) protrudes upward from the base end of (17), and the outer annular rib (16) protrudes obliquely downward outward from the vicinity of the upper end of the peripheral wall (18). It is installed.

  The upper annular rib (15) is fitted with the annular thin portion (33a) in the annular groove (23), and in the state where the operation handle (2) is completely attached to the gas plug main body (31), the annular groove portion The outer annular rib (16) is slidably in close contact with the ceiling surface (27) of (23), and the outer annular rib (16) is slidably in close contact with the inner peripheral surface of the skirt portion (24). Thus, the operation handle (2) rotates relative to the annular thin portion (33a) with the waterproof packing (10) interposed between the annular thin portion (33a) and the annular groove portion (23). By being movably attached, waterproofing in the gas plug body (31) is secured.

The lower end of the peripheral wall portion (18) of the waterproof packing (10) is provided with a gap (13) in which the lower end portion of the through hole (11) of the annular thin wall portion (33a) is exposed, and the ventilation member (1 The outer surface (12) of the cylindrical portion (33) is located deeper than the outer peripheral surface (38) to which the peripheral wall portion (18) is in close contact, so that the gap (13 ) Through the ventilation member (1). As a result, the space (S3) surrounded by the top surface (36) of the thread (3), the back surface of the operation handle (2), and the cylindrical portion (33) is not sealed, and has a breathable space. It becomes.
Incidentally, since the ventilation member (1) has a characteristic of impervious water, water does not enter the cylindrical portion (33) from the gap (13).

  Further, the outer surface (12) of the ventilation member (1) in the through hole (11) provided in the annular thin wall portion (33a) of the cylindrical portion (33) is a peripheral wall portion (18) of the waterproof packing (10), Since it is covered twice with the skirt part (24) of the operation handle (2), for example, in the case of a gas stopper for a gas meter, when coating for rust prevention is applied to the entire stopper, The paint does not adhere to the outer surface (12) of the member (1). Similarly, in the case of a gas stopper provided in the kitchen, the outer surface (12) of the ventilation member (1) is not clogged with dust, oil, detergent or the like.

In addition, even after assembly of the gas plug, the gas leak inspection can be carried out using the ventilation member (1), so that the trouble of disassembling and reassembling for the gas leak inspection can be saved, and the gas leak inspection is performed. Becomes easy.
Further, the grease layer (45) provided on the peripheral edge of the top surface (36) of the thread (3) ensures the lubricity and sealing performance of the sliding portion (35), but this grease layer (45) Is provided below the through hole (11) provided in the annular thin part (33a) and is covered with the protective cover (46), so that the grease layer (45 ) Does not flow out to the through hole (11) side. Therefore, the ventilation member (1) is not clogged with grease.

What is shown in FIG. 3 is a longitudinal cross-sectional view of the gas stopper of the second embodiment, and FIG. 4 is an enlarged cross-sectional view of the main part thereof.
As in the gas stopper of the first embodiment, the annular thin portion (33a) of the cylindrical portion (33) is rotatable in the annular groove portion (23) on the back surface of the operation handle (2). At the same time, the operating handle (2) is engaged with the engagement flange (34) of the gas plug main body (31) by engaging the flange (26) of the operating handle (2) with the cylinder of the gas plug main body (31). It is configured to be attached to the portion (33) so as to be rotatable and to be prevented from coming off.

A through hole (11) is passed through a predetermined position of the annular thin portion (33a) on the open end side of the cylindrical portion (33), and the flange portions (26) and (26) are connected to the engaging flanges (34) and (34). ) On the inner peripheral wall (28) of the annular groove (23) corresponding to the through-hole (11) from the non-protruding area of the cylindrical portion (33) (see FIG. 3). The circumferential groove portion (19) is provided so as to open to the annular groove portion (23), and the skirt portion (24) corresponding to the circumferential groove portion (19) and the through hole (11) has an insertion hole (29). Is provided.
The through hole (11) is formed as a stepped hole having a larger diameter on the skirt portion (24) side than the inner peripheral wall (28) side, and the insertion hole (29) is formed on the through hole (11). A circular hole having a diameter substantially matching the large diameter is formed, and the groove width of the circumferential groove portion (19) is formed to substantially match the small diameter of the through hole (11).

That is, in the gas stopper of this embodiment, as described above, the flanges (26) and (26) of the operation handle (2) are connected to the gas stopper main body ( The circumferential groove (19), the through hole (11), and the insertion hole (29) are in a straight line in the state before the start of use of the gas stopper, just fitted in the cylindrical portion (33) of 31). The ventilation member (1) is continuously inserted from the insertion hole (29) into the through hole (11) and the circumferential groove (19). As a result, the body portion of the ventilation member (1) is press-fitted into the through hole (11), and the tip end portion thereof engages in the groove width direction in the circumferential groove portion (19).
Incidentally, the peripheral wall portion (18) of the waterproof packing (10) to be in close contact with the outer periphery of the open end portion of the annular thin portion (33a) in the annular groove portion (23) is set to a dimensional relationship that does not cover the through hole (11). Yes.
Also in this embodiment, a stainless sintered body is used as the ventilation member (1), and it is molded into a shape having a small diameter shaft portion and a large diameter shaft portion that can be press-fitted into the stepped through hole (11). In addition, the tip of the small-diameter shaft portion is extended as it is to be positioned in the circumferential groove portion (19).

Since the sintered body is made of stainless steel and has hardness, the operation handle (2) is a gas in the state where the tip of the ventilation member (1) is inserted into the circumferential groove (19) through the through hole (11). With respect to the cylindrical part (33) of the plug body (31), the stopper part is prevented from coming off.
That is, in this embodiment, the operation handle is restricted to 90 degrees by the engagement of the rotation restricting pin (39) and the engaging convex portion (not shown) of the gas plug body, The engagement relationship between the flanges (26) and (26) and the engagement flanges (34) and (34) is maintained, and the operation handle cannot be removed, but the rotation restricting pin (39) is removed. Even in this case, since the distal end portion of the ventilation member (1) is engaged with the circumferential groove portion (19) of the operation handle (2), the operation handle (2) does not fall off and is higher in safety. It has become a thing.

  Further, the space (S3) can be freely vented to the outside due to the air permeability of the ventilation member (1), so the pressure in the space (S3) does not fluctuate. Therefore, when the gas stopper is stored or transported for a long period of time, it is possible to prevent the problem that the thread (3) is fixed inside the thread housing portion (30) due to a change in pressure applied to the thread (3).

The whole longitudinal cross-sectional view of the gas stopper of 1st embodiment of this invention. The principal part expanded sectional view of FIG. The whole longitudinal cross-sectional view of the gas stopper of 2nd Embodiment of this invention. The principal part expanded sectional view of FIG. The whole longitudinal cross-sectional view of the conventional gas stopper. The whole longitudinal cross-sectional view of the other conventional gas stopper.

Explanation of symbols

(1) ・ ・ ・ ・ ・ ・ ・ Ventilation member
(10) ... Waterproof packing
(11) ... ・ Through hole
(2) ・ ・ ・ ・ ・ ・ ・ Operation handle
(3) ...
(3a) ... ・ Gas flow path
(30) ...
(31) ... Gas plug body
(35) ... Operating handle
(36) ...

Claims (5)

A gas passage for opening and closing the gas flow path is rotatably accommodated in a gas accommodating portion that opens to one side of the gas plug main body, and a cylindrical portion is coaxially connected to the open end of the gas gas accommodating portion. In addition, in the gas stopper in which an operation handle for rotating the thread is attached to the cylindrical portion so as to be relatively rotatable via a waterproof packing,
A skirt portion that covers the outer periphery of the cylindrical portion is provided on the back surface of the operation handle,
The waterproof packing is provided between the outer periphery of the open end of the cylindrical portion and the inner peripheral surface of the skirt portion,
A through-hole penetrating the constituent wall of the cylindrical portion is formed at a predetermined position of the cylindrical portion covered with the skirt portion,
At least a part of the through hole is open to a non-mounting area of the waterproof packing, and the through hole is filled with a non-water-permeable ventilation member. 2. The gas stopper according to claim 1, wherein the waterproof packing is formed in an approximately L-shaped cross section from an annular flange piece that is in close contact with the open end surface of the cylindrical portion and a peripheral wall portion that is in close contact with the outer peripheral surface of the cylindrical portion. And
The gas stopper according to claim 1, wherein the peripheral wall covers the outer surface of the ventilation member in the through hole in a non-contact state.   The gas plug according to claim 1 or 2, wherein the ventilation member is made of a metal sintered body. The gas stopper according to claim 3, wherein an annular groove portion having the skirt portion as an outer peripheral wall is formed on the back surface of the operation handle,
A range including the through hole of the cylindrical portion is stored in the annular groove portion,
In a predetermined position corresponding to the through hole in the inner peripheral wall of the annular groove portion, a circumferential groove portion opened in the annular groove portion is formed in the circumferential direction,
The gas plug according to claim 1, wherein the ventilation member is press-fitted into the through-hole, and a distal end portion of the ventilation member is inserted into the circumferential groove portion and engaged with the groove width direction.   The gas stopper according to any one of claims 1 to 4, wherein a grease layer is provided on a peripheral edge of the top surface of the thread following the sliding portion, and the grease layer is covered with an annular protective cover. The gas plug is characterized in that the through hole is formed closer to the open end of the cylindrical portion than the protective cover.

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