JP4129469B2 - Gas stopper - Google Patents

Description

  The present invention relates to a gas stopper, and more particularly, to a gas stopper of a type that opens and closes a gas passage by turning a screw housed in a stopper body by turning an operation knob.

In a gas stopper of the type that opens and closes the gas passage by rotating the operation knob by rotating the operation knob, the operation knob and the lock are prevented from being relatively rotated by the engaging means provided between them. Is engaged.
As an example of this kind of gas stopper, as shown in FIG. 5A, a stopper provided with a gas passage (1a) arranged in a straight line and an upwardly open spiral container (10) provided therebetween. A main body (1), a tapered thread (2) that is accommodated in the thread accommodating part (10) and expands toward the top surface, and a cylindrical part that is continuous with the open end of the thread accommodating part (10) (11) includes an operation knob (3) that is pivotably mounted in a state of being prevented from being detached and is capable of rotating the screw (2). (Patent Document 1)

An operation shaft (24) having a pair of mutually parallel plane portions (24a) protrudes from the center of the top surface of the coil (2), and the operation shaft (24) includes a coil spring (4). And the stopper (5) is inserted. The coil spring (4) prevents the helix (2) from being lifted, and the stopper (5) has the operating shaft (24) inserted into a through hole (50) that has the same shape as the cross section of the operating shaft (24). By inserting it, it rotates together with the screw (2), and the rotation range of the operation knob (3) and screw (2) is restricted. The operation knob (3) is engaged with the tip of the operation shaft (24) of the screw (2), and the operation knob (3) and the screw (2) are assembled so as to be integrally rotatable. Thus, when the operation knob (3) is rotated, the thread (2) is pressed against the bottom of the thread housing portion (10), and the operation knob (3) is used with the operation shaft (24) as a rotation axis. ) In the same direction.
In this case, since the operation shaft (24) protrudes relatively high in the center of the top surface of the thread (2), the operation shaft (24) is used for machining when machining the tapered surface of the thread (2). It is easy to hold as a chucking portion, and high-precision processing can be performed in a stable state.

However, since the engagement portion between the screw (2) and the operation knob (3) is provided at the tip of the operation shaft (24), the engagement portion of the operation shaft (24) and the taper shape of the screw (2) The distance from the sliding surface becomes longer. Further, since the engaging portion with the operation knob (3) is a flat portion (24a) on both sides of the operation shaft (24) and is close thereto, a force is applied when the operation knob (3) is rotated. If a large force is applied to only one of the biased and flat surfaces (24a), a force to tilt the screw (2) along with the operating shaft (24) is generated, and a biased force is applied to the sliding surface. However, the operating force increases.
In this way, the turning operation of the thread (2) is difficult to perform smoothly, and there may be a problem that the operability is deteriorated.

On the other hand, what is shown in (B) of FIG. 5 is housed in the screw housing portion (10) by rotating the operation knob (3), similar to that shown in (A) of FIG. In this conventional example, a pair of engaging pieces (23) and (23) are provided at symmetrical positions along the peripheral edge of the upper end of the thread (2). The rear surface of the operation knob (3) is provided with engagement recesses (33) (33) that engage with the engagement pieces (23) (23).
In this case, the engagement part between the thread (2) and the control knob (3) is set at each position facing the top surface, which is the maximum diameter of the thread, and is on the tapered sliding surface of the thread (2). Since it is provided at a close position, it is possible to apply a force in the rotational direction almost evenly as compared with the gas stopper shown in the above (A), and no force to push the screw (2) acts. Therefore, the thread (2) can be smoothly rotated and the operability of the thread (2) is good.

However, in this conventional example, when the engagement piece (23) (23) is used as a chucking portion for holding the thread (2) when the taper surface of the thread (2) is processed, the chucking is performed. As the part, the engagement pieces (23) and (23) are short and difficult to hold, and when the chucking is performed with a strong force, the engagement pieces (23) and (23) are bent or deformed. Not suitable for processing.
Japanese Patent Laid-Open No. 9-42486 JP 2000-329251 A

As described above, in the gas stopper having the conventional configuration, as shown in FIG. 5 (A), the operation shaft (24) as the engaging portion between the screw (2) and the operation knob (3) is not connected to the screw (2). In the case of a configuration projecting high at the center, holding the operating shaft (24) stabilizes the chucking of the thread (2) and enables highly accurate machining. There is a problem that the dynamic operation is not performed smoothly and the operability is deteriorated. In addition, as shown in FIG. 5 (B), when the two engaging portions are provided at symmetrical positions on the periphery of the maximum diameter of the thread (2), the operability of the thread (2) is good. In machining the taper sliding surface of the thread (2), the chucking of the thread (2) is not stable, and there has been a problem that high-precision machining cannot be performed.
Also, when pulling out the screw (2) from the screw housing part (10), the screw (2) is pulled out by holding the operating shaft (24) or the engaging pieces (23) (23). ), The operation shaft (24) or the engagement pieces (23) (23) may be damaged.

The present invention provides a plug body having a thread accommodating portion that communicates with a gas passage and opens on one side;
A gutter that is rotatably accommodated in the grommet accommodating portion and opens and closes the gas passage;
An operation knob that is attached to a cylinder portion that is continuous with the open end of the screw housing portion so as to be rotatable relative to the cylinder portion, and that is engaged with the top surface of the screw via an engaging means. It is an object of the present invention to ensure high machining accuracy of the thread and to maintain smooth operability with an operation knob.

In order to solve the above-mentioned problems, the solution means of the present invention is as follows: `` The engagement means are provided at symmetrical positions along the periphery of the top surface of the thread, and at the center of the top surface. The holding shaft for holding protrudes higher than the engaging means ”.
Since the engagement means for the screw and the control knob are provided at symmetrical positions along the periphery of the top surface of the screw, it is easy to apply a force in the rotating direction to the screw when turning the knob. Even if the engagement position between the operation knob and the screw is slightly shifted in the radial direction, the force in the rotational direction can be applied substantially evenly. In addition, since the holding shaft for holding the thread protrudes higher than the engaging means at the center of the top surface, the holding shaft is used when processing the thread, handling the thread, or pulling the thread. Can be used.

In addition, as in the invention of claim 2, “the engaging means is a pair of engaging convex portions or a pair of engaging concave portions provided on the top surface of the thread and a back surface of the operation knob corresponding thereto. A pair of engaging grooves or a pair of engaging protrusions provided at each position;
In the rear surface of the operation knob corresponding to the holding shaft, an accommodation recess capable of accommodating the tip of the holding shaft is provided. ”The engagement projection is engaged with the engagement recess, and the engagement recess is engaged. The mating protrusions are engaged with each other, and the operation knob and the screw can be integrally rotated. An accommodation recess is provided in the center of the rear surface of the operation knob, and accommodates the tip end portion of the holding shaft that protrudes higher than these when the engagement means is engaged.

  Further, when pulling out the tool, as in the third aspect of the present invention, the tool is held on the holding shaft by “providing an engaging portion with which the tool for pulling out can be engaged at or near the tip of the holding shaft”. By being engaged with the engaging portion, it is easy to pull out the thread from the thread storing portion.

  Further, as in the invention of claim 4, the engaging portion is “a screw hole provided so as to open to the tip of the holding shaft or a different diameter portion provided on a peripheral wall near the tip”. Then, the screw and the tool can be integrated by screwing the tool into the screw hole or hooking the tool on the different diameter portion.

  In the inventions according to claims 1 and 2, since the engagement means between the thread and the operation knob is provided at a symmetrical position on the periphery of the top surface of the thread, the force in the rotating direction can be easily applied to the thread. The smooth operability can be maintained. Further, since the machining operation can be performed while holding a holding shaft provided separately from the engaging means at the time of machining, highly accurate machining can be maintained by stable chucking. Furthermore, since the holding shaft can be held during the assembly operation of the gas stopper and the extraction operation from the thread receiving portion, the workability is good and the engagement means with the operation knob is damaged. There is no inconvenience.

  According to the third and fourth aspects of the present invention, by using the engaging portion (screw hole or different diameter portion) provided on the holding shaft, it becomes easy to attach the drawing tool to the screw, and the workability of the screw drawing operation is improved. Can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a gas stopper according to an embodiment of the present invention in an assembled state.
The gas plug of this embodiment is a so-called screw gas plug in which the upstream screw cylinder portion (12) and the downstream screw cylinder portion (13) are connected to the plug body (1) so as to be coaxially arranged. A thread accommodating part (10) is provided between the upstream screw cylinder part (12) and the downstream screw cylinder part (13), and the thread (2) to be accommodated in the thread accommodating part (10) is operated. The gas stopper is configured to open and close the flow path of the gas stopper by being rotated along with the rotation of the knob (3).

[About the configuration of the plug body (1)]
As shown in FIG. 1, the plug body (1) is connected between the upstream screw cylinder portion (12) and the downstream screw cylinder portion (13) which are coaxially arranged, and an inverted cone. An upwardly-opening thread accommodating part (10) capable of accommodating the trapezoidal thread (2) is provided, and a cylindrical part for rotatably engaging the operation knob (3) is provided at the upper open end. (11) is extended.
A gas pipe (not shown) is connected to the upstream screw cylinder portion (12) and the downstream screw cylinder portion (13).
Further, in the vicinity of the upper open part of the thread receiving part (10), a presser barb part (14) is projected inward so as to be partially located.

[About Sen (2)]
The thread (2) is an inverted frustoconical body having a size that is just accommodated in the thread accommodating part (10) and that expands upward, and includes an upstream screw cylinder part (12) and a downstream screw cylinder. A gas passage hole (22) communicating with the gas passage formed of the portion (13) passes therethrough.
FIG. 1 shows a fully opened state of the gas stopper with the gas passage hole (22) of the thread (2) communicating with the gas passage. From this state, the thread (2) is moved together with the operation knob (3). When turned 90 degrees, the passage is closed.
Further, at the symmetrical position along the peripheral edge of the top surface of the thread (2), as shown in FIG. 1 and FIG. As a means, a pair of arc-shaped engaging projections (20) and (20) are provided so as to project. The engaging projections (20) and (20) are formed so as to draw an arc slightly smaller in diameter than the maximum diameter of the top surface of the thread (2), and the projecting position thereof is the gas passage hole ( 22) is set so as to be located above the open end.

Furthermore, a cylindrical holding shaft (21) is provided at the center of the top surface so as to protrude higher than the engaging convex portions (20) and (20).
The holding shaft (21) has a screw hole (26) that opens to the upper end along the axis, and a circumferential groove in the vicinity of the upper end has a concave groove (27). Has been.
An annular groove (25) for receiving the lower end of the coil spring (4) is formed concentrically with the spiral (2) so as to surround the base end of the holding shaft (21).

[About the control knob (3)]
As shown in FIGS. 1 and 3, the cylindrical portion (11) is rotatably fitted in a position corresponding to the cylindrical portion (11) of the plug body (1) on the lower surface of the operation knob (3). The annular groove (31) is formed so as to open downward, and the central recess (32) in which the upper end of the holding shaft (21) is accommodated in a loose fit state is also open downward in the center. In addition, the engagement grooves (30) in which the engagement protrusions (20) and (20) are respectively fitted in the relative rotation prevention state from the mutually opposing positions of the central recess (32) to the side. (30) is extended and extended downward.
The depth of the central recess (32) is set deeper than the engagement grooves (30) and (30), and the formation position of the engagement grooves (30) and (30) with respect to the center recess (32). Is set at a position along the forming direction of the knob portion (35) on the upper surface of the operation knob (3).

Further, the presser foot part (14) is located below the presser foot part (14) (14) from the non-formation area of the presser foot part (14) projecting partially on the inner peripheral surface of the upper open part of the thread receiving part (10). Engagement hooks (34) (34) that are pushed in to engage with the presser hooks (14) (14) so as to be rotatable from below are provided so as to protrude in a predetermined direction. .
By engaging the engaging hooks (34) (34) below the presser hooks (14) (14), the operation knob (3) is prevented from coming off with respect to the plug body (1). In this state, the cylindrical portion (11) is engaged with the annular recessed groove (31), the upper end portion of the holding shaft (21) is engaged with the central recessed portion (32), and the engaging convex portions (20) and (20) are engaged. Corresponding to each of the concave grooves (30) and (30), the cylindrical portion (11) is an annular concave groove (31), and the engagement flange portions (34) and (34) are presser flange portions (14) and (14). The engaging protrusions (20) and (20) are fitted into the engaging grooves (30) and (30) in a substantially tightly fitted state, respectively, and the operation knob ( The spiral (2) is set to rotate simultaneously with the rotation of 3).

Further, a gap of a predetermined width is formed between the holding shaft (21) and the inner peripheral surface of the central recess (32), and this gap is provided on the top surface of the thread (2). A coil spring (4) is interposed between the annular groove (25). The free height of the coil spring (4) is higher than the distance from the bottom of the annular groove (25) to the bottom of the central recess (32) when the operation knob (3) is attached to the plug body (1). The coil spring (4) is interposed between the annular groove (25) and the central recess (32) in a compressed state.
The engaging hooks (34) and (34) are engaged with the presser hooks (14) and (14) from below, and the operation knob (3) is attached to the stopper main body (1) in a retaining state. Therefore, the thread (2) is constantly pressed to the bottom side of the thread housing part (10) by the elastic return force of the coil spring (4).

[Assembly of gas stopper]
To assemble the gas stopper, first apply a lubricant or sealant such as grease or oil to the sliding surface of the thread (2), and store the thread (2) in the thread housing (10) of the body (1). . At this time, the holding shaft (21) protruding from the center of the top surface of the thread (2) can be pinched with a jig or a finger and can be accommodated from the upper open part of the thread accommodating part (10). Good sex.

Then, after placing the coil spring (4) in the annular groove (25) around the holding shaft (21), the engagement flanges (34) (34) of the operation knob (3) are connected to the plug body (1 ) And press the operation knob (3) against the elastic return force of the coil spring (4) in correspondence with the non-formation area of the presser foot (14). The operation knob (3) is rotated so that the) is positioned below the presser barbs (14) and (14). As a result, the operation knob (3) is attached to the stopper main body (1) in a state of being prevented from coming off, and the coil spring (4) is compressed between the screw (2) and the operation knob (3). And the thread (2) is pressed against the bottom of the thread housing part (10) by the coil spring (4), so that it has a stable posture in the thread housing part (10). Will be housed.
At this time, the cylindrical portion (11) of the plug body (1) is fitted into the annular groove (31) of the operation knob (3) so as to be relatively rotatable, and the distal end portion of the holding shaft (21) of the thread (2) Is housed in the center recess (32) in a loosely fitted state, and the engaging protrusions (20) and (20) are fitted into the engaging recessed grooves (30) and (30) in a substantially tightly fitted state. The operation knob (3) can be rotated with respect to the plug body (1), and can be mounted so as to be integrally rotatable with the screw (2).

  The gas passage hole (22) of the pipe (2) communicates with the upstream screw cylinder (12) and the downstream screw cylinder (13), and the operation knob (3) is opened from this fully open state. In any of the closed states of the gas passage rotated 90 degrees, the engagement hooks (34) (34) are set to be engaged with the lower surfaces of the presser hooks (14) (14). . The engaging grooves (30), (30) are formed along the extending direction of the knob portion (35) and are engaged with the engaging grooves (30), (30). (20) (20) Since it is formed at a predetermined position along the penetration direction of the gas passage hole (22) of the spiral (2), in the state where the operation knob (3) is attached, the knob portion (35 ) Is the same as the direction of the gas passage hole (22).

  For example, as shown in FIG. 1, when the knob portion (35) is positioned parallel to the gas passage from the upstream screw cylinder portion (12) to the downstream screw cylinder portion (13), the thread (2) The gas passage hole (22) is in a fully opened state of the gas stopper communicating with the gas passage, and from this state, the operation knob (3) is rotated 90 degrees by holding the knob part (35), and the knob part ( When 35) is positioned at right angles to the gas passage, the thread (2) is also rotated 90 degrees, the gas passage hole (22) goes straight to the gas passage, and the gas stopper is closed. .

When the operation knob (3) is rotated, a force in the rotation direction acts on the pair of engagement protrusions (20) and (20), which are the engagement parts with the operation knob (3). The positions where the portions (20) and (20) are formed are symmetrical positions along the peripheral edge of the top surface constituting the maximum diameter of the thread (2). The distance from the sliding surface in (2) is close. Therefore, even if the distance from the center of the thread (2) to each of the engaging portions is slightly deviated, it is easy to apply the force in the rotational direction from the operation knob (3) to the thread (2) almost evenly. In addition, the force for defeating the thread (2) does not act with the turning operation of the thread (2).
Therefore, the thread (2) can be smoothly rotated in accordance with the operation of the operation knob (3) in the thread housing portion (10).

  To remove the screw (2) from the screw holder (10) during maintenance, etc., just hold the holding shaft (21) with your finger as in the case of holding the screw (2). ) Is fixed to the spiral housing part (10), as shown in FIG. 4, the tool (40) for pulling is hooked into the groove (27) and pulled out, although not shown, The screw part is screwed into the screw hole (26) opened at the tip of the holding shaft (21) and integrated with the screw (2), the tool together with the screw (2) and the plug body (1 ), The thread (2) can be removed from the thread housing part (10).

In addition to using the holding shaft (21) as a chucking part when machining the taper surface of the thread (2), when handling the thread (2), the holding shaft (21) can be gripped to work. Therefore, workability in the manufacturing process such as processing, movement, and assembly is improved.
In the above-described embodiment, the engagement protrusions (20) and (20) are provided on the thread (2) as the engagement means between the thread (2) and the operation knob (3). The engagement groove (30) (30) is provided in (3), but the engagement recess is provided in the thread (2), and the engagement protrusion that can be fitted to this is provided in the operation knob (3). Also good.
Moreover, it is good also as a structure which provides the protruding item | line with which a tool can be engaged instead of the groove (27) provided in the holding shaft (21).

Sectional drawing of the assembly state of the gas stopper in embodiment of this invention. The top view of the thread | bridging employ | adopted as the gas stopper in embodiment of this invention. The bottom view of the operation knob employ | adopted as the gas stopper in embodiment of this invention. Explanatory drawing which shows a mode that a lead is pulled out. (A) and (B) are both exploded perspective views of a conventional gas stopper.

Explanation of symbols

(1) ............ Body body
(10) ....
(11) ・ ・ ・ ・ ・ ・ ・ ・ Cylinder
(2) ...
(3) ..... Control knob
(20) ..... engaging means (engagement convex part)
(21) ... Holding shaft

Claims (4)

A plug body having a thread accommodating portion communicating with the gas passage and opened on one side;
A gutter that is rotatably accommodated in the grommet accommodating portion and opens and closes the gas passage;
An operation knob that is attached to a cylinder portion that is continuous with the open end of the screw housing portion so as to be rotatable relative to the cylinder portion, and that is engaged with the top surface of the screw via an engaging means. In a gas stopper comprising:
The engaging means is provided at symmetrical positions along the periphery of the top surface of the thread, and a holding shaft for retaining the thread protrudes higher than the engaging means at the center of the top surface. A gas stopper characterized by that. 2. The gas stopper according to claim 1, wherein the engaging means includes a pair of engaging convex portions or a pair of engaging concave portions provided on the top surface of the thread, and a back surface of the operation knob corresponding thereto. A pair of engaging grooves or a pair of engaging protrusions provided at a position,
The gas stopper according to claim 1, wherein an accommodation recess capable of accommodating the tip of the holding shaft is provided on a back surface of the operation knob corresponding to the holding shaft.   The gas plug according to claim 1 or 2, wherein an engagement portion capable of engaging with a tool for drawing out is provided at or near the tip of the holding shaft.   The gas plug according to claim 3, wherein the engaging portion is a screw hole provided to open to a tip of the holding shaft or a different diameter portion provided on a peripheral wall near the tip.

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