JP3437193B2 - Seal plug pusher - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal plug pushing tool for pushing an elastic seal plug into the end of a fluid transport pipe to close the end of the fluid transport pipe. The present invention relates to a seal plug pushing tool for closing the air purging pipe by pushing the elastic seal plug after purging the air in the pipe from the pipe.

[0002]

2. Description of the Related Art Conventionally, as a seal plug pushing tool of this type, as shown in FIG. 5, for example, a flat front face F having a diameter substantially equal to the inner diameter of a pipe P which is a fluid transport pipe into which an elastic seal plug S is to be pushed. A disc-shaped pushing portion E having a groove is provided at the tip of a thin shaft R, which is widely used.

[0003]

However, when the elastic seal plug S is pushed into the pipe P by the above-mentioned seal plug pushing tool, the shaft R is thin, so that the axis of the shaft R is displaced from the axis of the pipe P and is slanted. Therefore, the direction of the force applied to the elastic seal plug S becomes unstable, and there is a risk that the elastic seal plug S may be reversed inside the pipe P, for example. Therefore,
It is conceivable to make the shaft R thick so as to prevent the axis of the shaft R from deviating from the axis of the pipe P, but this causes a drawback that the seal plug pushing tool itself becomes heavy.
Further, when the elastic seal plug S is pushed into the pipe P with such a seal plug pushing tool, the elastic seal plug S is compressed in the axial direction of the pipe P over the entire end surface in contact with the front surface F of the pushing portion E. Therefore, a large force acts to spread the elastic seal plug S in the radial direction of the pipe P, and as a result, the pushing resistance becomes too large, and it becomes difficult to push the elastic seal plug S into the pipe P, and it is pushed deeply. When it was necessary, there was a problem that workability was particularly poor.

Therefore, an object of the present invention is to reduce the pushing resistance of the elastic seal plug when it is pushed into the fluid transport pipe, and to easily push the elastic seal plug deep into the fluid transport pipe in a stable posture. (EN) Provided is a seal stopper pushing tool having good workability.

[0005]

To achieve this object, the seal plug pushing tool according to the present invention is characterized in that it comprises a grip portion and a pushing rod portion which can be inserted into a fluid transport pipe. A large-diameter guide portion that can be slidably fitted in the fluid transport pipe and a small-diameter pushing tip portion having a smaller diameter than the large-diameter guide portion, and the small-diameter pushing tip portion is formed in a tubular shape. And its effects are as follows.

[0006]

That is, in order to push the elastic seal plug into the end portion of the fluid transport pipe, as shown in FIG. 3, for example, the large-diameter guide portion 2a is fitted inside while slidingly contacting the inner peripheral surface of the pipe P which is the fluid transport pipe. Then, the elastic seal plug S is pushed into the pipe R by the small-diameter pushing tip portion 2b while holding the grip portion, so that the large-diameter guide portion 2a has a stable posture in which the axial center of the large-diameter guide portion 2a is substantially aligned with the axial center of the pipe P. Therefore, the small-diameter push-in tip 2b can always be contacted and pressed against the elastic seal plug S in a stable posture on the basis of this, and, in addition, the elastic seal plug S has the front surface F of the push part E as in the conventional case. Instead of being pressed by the entire end surface in contact with (see FIG. 5), a cylindrical small-diameter pushing tip 2b.
As a result of being pushed in, the elastic seal plug S is deformed into a state in which a part of the elastic seal plug S has entered the space around the small diameter pressing tip 2b and the space inside thereof, and the elastic seal plug S projects in the radial direction of the pipe P at the time of pressing. The pressure contact force to do so can be reduced by that amount, and when viewed from the tip side of the small diameter pushing tip 2b, this bites into the elastic seal stopper S so as to grip it, so that the elastic seal stopper S is stable without being inverted. It is possible to reliably push the pipe P deep into the pipe P while keeping it in this posture.

[0007]

Therefore, it is possible to provide a seal plug pushing tool having a small work resistance and capable of pushing an elastic seal plug deep into a fluid transportation pipe in a stable posture and with good workability. As shown in FIG. 3, when the inner surface of the distal end of the cylindrical small-diameter pushing tip portion 2b is formed into the taper surface 3 which is divergent, the elastic seal plug is the pushing rod tip portion 2b.
Therefore, it is easy for the elastic seal plug S to be gripped by the small-diameter pushing tip 2b more easily. It easily bites into and is easily locked. Further, when the large-diameter guide portion 2a is formed in a cylindrical shape (see FIG. 3), even if it is made thicker so that the entire inner peripheral surface of the pipe P is slidably contacted and easily guided when fitted, It is possible to make a seal plug pushing tool that is relatively lightweight and easy to handle,
Further, the pushing rod portion is composed of a large-diameter pushing cylinder member and a small-diameter pushing cylinder member each having the large-diameter guide portion and the small-diameter pushing tip portion, and the large-diameter pushing cylinder member is detachably fitted onto the outside. It is also possible to form a double structure in which a threaded portion that is screwed and connected is formed at the base end portion of the small diameter pushing cylinder member.
It is not bulky to carry or store, and when pushing the elastic seal plug into a thick pipe, use the larger diameter pushing cylinder member,
When pushing into a thin pipe, the outside large-diameter pushing cylinder member can be removed, and the small-diameter pushing cylinder member can be used as a seal plug pushing tool.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seal plug pushing tool according to the present invention will be described below with reference to the drawings. The seal plug pushing tool shown in FIG. 1 is a pipe P at the branch portion of the variant cheese for air purging, which is an example of a fluid transport pipe during gas piping work.
After purging the air in the pipe (see FIG. 2), the elastic seal plug S of the independent bubble is pushed in to close the pipe P, which can be inserted into the grip portion 1 and the pipe P. And a small-diameter pushing cylinder member 2T. The large-diameter pushing cylinder member 2T is detachably fitted and screwed. A threaded portion 5 for coupling and connecting is formed at 4 at the base end portion of the small diameter pushing cylinder member 2t. The large-diameter pushing cylinder member 2T and the small-diameter pushing cylinder member 2t of the pushing rod portion 2 have the same configuration except that the sizes are different. Therefore, the large-diameter pushing cylinder member 2T will be described below. It is composed of a cylindrical body integrally formed with a large-diameter guide portion 2a capable of sliding contact with the inside and a small-diameter pushing tip portion 2b having a smaller diameter than the large-diameter guide portion 2a. It is formed on the tapered surface 3.

Reference numeral 6 in the drawing denotes a collar portion. This is so that, for example, when the elastic seal plug S is pushed into the pipe P for air purging via the pipe connected thereto (see FIG. 2), the pushing rod portion 2 does not go deeper than its entire length. This is to prevent the elastic seal plug from entering too deeply and to avoid the risk that the hand holding the grip 1 hits the open end of the tube into which the elastic seal plug should be pushed. Next, the procedure for pushing the elastic seal plug S into the pipe P (see FIG. 2) using the above seal plug pushing tool will be outlined. FIG. 2 shows an air purging jig used for gas piping work. This is for purging the air in the pipe from the pipe P at the branched portion of the irregular-shaped cheese and for closing the pipe P by pushing in the elastic seal plug S of the independent bubble after purging the air. The diffusion pipe X is vertically connected to the pipe P through the mounting portion J, the ball valve V, and the guide portion G.
In the figure, T is a fastener for fastening the mounting portion J to the pipe P, and O is an O-ring. When the air purging ends and the gas pipe is replaced with a flammable gas, the ball valve V is closed, the guide portion G and the diffusion pipe X are removed from the ball valve V, and the cylindrical elastic seal plug S is attached to the ball valve V. After pushing into the open end, the guide part G is attached again. At this time, the guide portion G is configured so as to abut against the upper end surface peripheral portion of the elastic seal plug S from above and hold it downward.
Serves as a retaining device. Ball valve V in this state
Open and open the elastic seal plug S using the above seal plug pushing tool.
After pushing into the bottom of the pipe P, pull out the seal stopper pushing tool, loosen the fastening tool T, and fix the mounting portion J and the ball valve V.
Is removed from the pipe P, the upper part of the pipe P is cut, and a cap (not shown) is fused there, and a series of sealing operations are completed.

[Other Embodiments] As shown in FIG. 4, in this seal stopper pushing tool, a thin rod portion 7 that connects the grip portion 1 and the large-diameter guide portion 2a is formed in the pushing rod portion 2. At the same time, the elastic seal plug S is fitted into the opening end of the fluid transport pipe P to be pushed into a lid shape so that the axial center of the rod portion 7 becomes the axial center of the fluid transport pipe by the cooperation of the large diameter guide portion 2a. A guide lid member 8 for inserting the small-diameter pushing tip portion 2b into the fluid transport pipe in a substantially matched posture may be slidably fitted on the rod portion 7.

Further, the tip edge of the small-diameter pushing tip portion 2b is formed in an uneven shape in the circumferential direction so that the elastic seal plug portion S can be more easily locked, and at the same time, the radial expanding deformation force at the time of pushing. May be controlled more effectively.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a seal stopper pushing tool according to an embodiment.

FIG. 2 is a side view of an air purging jig.

FIG. 3 is an operation explanatory view of the seal stopper pushing tool according to the present invention.

FIG. 4 is a vertical sectional side view of a seal stopper pushing tool according to another embodiment.

FIG. 5 is a seal stopper pushing tool in a conventional example.

[Explanation of symbols]

1 grip 2 Push rod part 2a Large diameter guide 2b Small diameter pushing tip S Elastic seal plug P fluid transport pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B25B 25/00-33/00 B23P 19/00-21/00

Claims (4)

(57) [Claims] 1. A seal plug pushing tool for pushing an elastic seal plug (S) into an end portion of the fluid transport pipe (P) to close the end portion of the fluid transport pipe (P), the grip portion (1). )When,
A push rod portion (2) that can be inserted into the fluid transport pipe (P), and the fluid transport pipe (P) is attached to the push rod portion (2).
A large-diameter guide portion (2a) capable of sliding contact with the inside and a small-diameter pushing tip portion (2b) having a smaller diameter than the large-diameter guide portion (2a) are formed, and the small-diameter pushing tip portion (2b) is formed into a tubular shape. A seal stopper pushing tool formed on the. 2. The seal plug pushing tool according to claim 1, wherein an inner surface of the tip of the cylindrical small-diameter pushing tip portion (2b) is formed into a tapered surface (3). 3. The seal plug pushing tool according to claim 1, wherein the large-diameter guide portion (2a) is formed in a tubular shape. 4. A large-diameter pushing cylinder member (2T) and a small-diameter pushing cylinder member (2t) each having the large-diameter guide portion (2a) and the small-diameter pushing tip portion (2b). ) And a screw portion (5) for detachably fitting the large diameter pushing cylinder member (2T) so as to be screwed and connected to the base end portion 4 of the small diameter pushing cylinder member (2t). The seal stopper pushing tool according to claim 3, wherein