JP2524645Y2 - Hole saw with pipe piercing piece holding function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention forms perforations in the peripheral wall of the upper and lower regions of the horizontal neutral plane, eccentric from the vertical neutral plane of the pipe and parallel to the vertical neutral plane. The present invention relates to a technique in which a perforated piece of a pipe can be held and taken out without dropping in a hole saw.

[Prior Art] In a buried supply pipe for city gas, when a branch pipe E is branched from a main pipe A shown in FIG. 8, a branch split type pipe joint constituted by a pair of split joint members B1 and B2. B is hermetically coupled in a holding state, and a coupling joint member D to which a punch (not shown) having a hole saw (not shown) attached is attached to one of the split joint members B1 via a slide shutter C in an airtight manner. The punch C is attached to the coupling joint member D, the shutter C is opened, the drill Q is formed in the main pipe A with a hole saw, the shutter C is closed, and the branch pipe E is exchanged with the drill. Construction was performed by the procedure of connecting to the connection joint member D.

As described above, in the construction method in which the perforation Q is formed from the side of the main pipe A, the perforator must be attached to the coupling joint member D extending horizontally and radially outward from the main pipe A.
, A relatively large space for attaching the drilling machine is required on the outer side in the horizontal direction, that is, on the side of the main pipe A, so that the excavation volume of the ground becomes large and the construction becomes complicated. In addition, if another pipe is already buried relatively close to the side of the main pipe A, there may be a case where the construction becomes impossible due to the restriction on the excavation space of the ground.

Therefore, as shown in FIG. 9, the vertical axis of the drilling machine (not shown) for forming the drilling Q, that is, the vertical axis of the hole saw F attached to the drilling machine is set to the vertical neutral axis passing through the axis C1 of the main pipe A. Eccentric from the plane HCL and set parallel to the vertical neutral plane HCL, whereby the perforation Q is formed in the horizontal neutral plane LC of the main pipe A.
A branch-split type pipe joint B formed on the peripheral wall of the upper and lower regions of L to enable connection of the branch pipe E has been devised.

[Problem to be Solved by the Invention] However, when a perforation Q is formed in the main pipe A using the branch-and-split type pipe joint B shown in FIG. Is one split joint member
It will fall into B1.

Therefore, conventionally, after the perforation Q is formed and the perforator and the hole saw F are removed, for example, the perforated piece q is sucked out by a magnet bar and taken out.

However, since the inner and outer surfaces of the perforated piece q are curved surfaces having a predetermined radius of curvature, the perforated piece q is attracted to the magnet bar in a point contact state, and is inferior in attraction. Therefore, when pulling out and removing the perforated piece q, one of the joint members B1
When it comes into contact with the inner surface of the hole, it easily falls and there is an annoyance that the perforated piece q must be sucked again.

Further, in the case where the main tube A is a corrosion-resistant tube coated with a resin layer, the magnet rod has a low attraction force, and thus has a problem that the main tube A is more easily dropped.

These problems can be solved by increasing the attraction force (magnetic force) of the magnet bar. However, the opening b1 through which the hole saw F formed in one of the split joint members B1 is inserted and removed is considered. Since the vertical dimension l of the perforated piece q is considerably longer than the diameter of the port b1, in which a plug (not shown) or a shutoff valve (not shown) is detachably mounted after the perforation Q is formed, If the piece q is not sucked in the vertical posture, it cannot be taken out from the mouth b1, and there is a problem that the work of sucking in the vertical posture is extremely difficult.

The present invention has been made in view of the above circumstances,
It is possible to reliably hold and take out the perforated piece without dropping the perforated piece onto the split joint member, and it is possible to improve the workability by eliminating the cumbersome work of taking out and collecting the perforated piece conventionally required. Rather, the friction resistance during drilling is extremely small, so that predetermined drilling work can be performed smoothly and smoothly, and the function of holding the drilling piece is ensured even for long-term use to achieve a longer life. It is an object of the present invention to provide a hole saw having a function of holding a pierced piece of a pipe.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method of manufacturing a fuel cell system, comprising: an eccentricity from a vertical neutral plane of a pipe; In a hole saw that forms a hole in the hole saw, a vertical axis is provided in the cylindrical main body of the hole saw so as to be swingable via an elastic member and always positioned concentrically with the cylindrical main body by the elastic return force of the elastic member. At the lower end of the vertical shaft, a sphere-shaped piercing piece holding portion which swells radially outward and cooperates with the inner surface of the peripheral wall of the cylindrical main body to pinch the piercing piece of the tube is provided. At the center, it is mounted so as to be relatively rotatable around the axis of the vertical axis.

[Operation] According to the present invention, the hole saw descends in parallel with the vertical neutral plane while rotating eccentrically from the vertical neutral plane of the pipe to form perforations in the peripheral walls of the upper and lower regions of the horizontal neutral plane of the pipe. During the process, the perforated piece holding portion abuts on the surface of the region above the horizontal neutral plane of the pipe in the rotation stopped state. Then, as the perforated piece holding section descends with the hole saw to a position corresponding to the horizontal neutral plane of the pipe while the rotation is stopped, the vertical axis is set to the outer curvature of the pipe, that is, the outer curvature of the perforated piece. Eccentrically while swinging in the radial direction of the tube against the elastic force of the elastic member along.

As the hole saw is further rotated while rotating, and the perforated piece holding part moves downward from a position corresponding to the horizontal neutral plane of the pipe, the perforated piece holding section is located below the horizontal neutral plane of the pipe. Along the outer surface of the curvature of the perforated piece in the region of the above, swing back to the position concentric with the hole saw together with the vertical axis due to the elastic return force of the elastic member, and the perforated piece on the inner surface side of the peripheral wall of the cylindrical main body of the hole saw. By pressing, when the drilling is completed, the drilling piece is pinched by the cooperation of the drilling piece holding part and the inner surface of the peripheral wall of the cylindrical main body, and the drilling piece can be taken out by pulling up the hole saw in this state It is.

By the way, at the time of drilling as described above, the drilling piece holding portion is formed of a spherical member, and at the spherical center portion thereof, it is relatively rotatable around the axis of the vertical axis. Since the holding portion does not rotate only by elastic contact with a point or a line, the rotational frictional resistance at the time of drilling does not increase, and the frictional resistance to the downward movement of the hole saw also decreases, thereby facilitating the predetermined drilling operation. Not only can it be performed lightly, but also the wear of the perforated piece holding portion can be extremely reduced, and a predetermined perforated piece holding function can be ensured for a long-term use to extend the life. It is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention,
In the figure, a hole saw 1 includes a cylindrical main body 1A having a cutting blade 1a formed at a lower end, and a shank 1B concentrically provided on the upper side of the cylindrical main body 1A.

A vertical shaft 3 is provided in the cylindrical main body 1A via an elastic member 2.
Are mounted concentrically and swingably, and a holding member 4 is provided by attaching a spherical member having a diameter considerably larger than the outer diameter of the vertical shaft 3 to the lower end of the vertical shaft 3. I have.

The elastic member 2 is made of, for example, a relatively hard solid rubber having a circular cross section and metal flanges on its upper and lower end surfaces.
5A, 5B are integrally joined by, for example, vulcanization baking, and the male screw member 6A extending upward at the center of the upper flange 5A.
Is fixed, and a male screw member 6B extending downward is fixed to the center of the lower flange 5B.

The upper male screw member 6A has a screw hole 7 formed at the center of the ceiling 1C in the cylindrical main body 1A of the hole saw 1, that is, a vertical axis that is concentric with the vertical axis C2 of the hole saw 1, and faces the ceiling 1C upward from the lower surface. The elastic member 2 is attached to the inside of the cylindrical main body 1A by screwing into the screw hole 7 formed in the cylindrical body 1A.

The vertical shaft 3 has a screw hole 3A formed concentrically with the vertical axis at the upper end, and a flange 3B extending radially outward near the upper side of the lower end. Therefore, screw hole 3A
Is screwed onto the lower male screw member 6B on the elastic member 2 side, so that the vertical shaft 3 is concentrically and swingably attached to the cylindrical main body 1A of the hole saw 1 via the elastic member 2.

The holding part 4 is for holding a perforated piece described later in cooperation with the inner surface of the peripheral wall of the cylindrical main body part 1A of the hole saw 1, and is made of a spherical member formed of hard rubber or hard resin into a spherical shape. A mounting hole 4B penetrating in the vertical direction is formed through the center portion thereof, and the lower end of the vertical shaft 3 is inserted into the mounting hole 4B so that the upper end of the holding portion 4 made of the spherical member is connected to the vertical shaft. 3 and a bottom flange 3C on the lower end surface of the vertical shaft 3.
Is fixed by screwing the holding part 4 to the vertical axis 3
Is attached to the lower end of the shaft so as to be relatively rotatable about the axis C3 of the vertical shaft 3.

Further, a horizontal hole 3D is formed through the upper end of the vertical shaft 3 to penetrate therethrough, and the horizontal hole 3D communicates with the fixing member insertion hole 6b formed horizontally through the lower male screw member 6B, The vertical shaft 3 is fixed to the lower side of the elastic member 2 by inserting a fixing member 9 made of, for example, a spring pin. In the drawings, reference numerals 10 and 10 denote spring washers.

 Next, the operation of the above configuration will be described.

First, as shown in FIG. 2, the main pipe A is airtightly held and integrally joined by a branch-split type pipe joint B composed of a pair of split joint members B1 and B2, and is joined to one split joint member B1. The hole saw 1 attached to the drilling machine (not shown) is lowered from the formed port b1, that is, the port b1 to which a plug or a shutoff valve (not shown) is removably mounted. That is, at a position where the hole saw 1 is eccentric to the right side of the drawing from the vertical neutral plane HCL of the main pipe A, the vertical neutral plane H
Lower while rotating parallel to CL.

As a result, the cutting blade portion 1a of the hole saw 1 is
Cutting is started by contacting the surface of the upper region, and the spherical member forming the holding portion 4 slides on the surface of the region (see FIG. 3).

As cutting progresses as the hole saw 1 descends,
The holding portion 4 descends while sliding on the outer surface of the curvature of the main tube A, and inclines the vertical axis 3 in the radial direction of the main tube A with the elastic member 2 as a fulcrum, against the elasticity of the elastic member 2. Holder 4 is main pipe A
As shown in FIG. 4, the holding section 4 is eccentric from the vertical neutral plane HCL by the maximum eccentric amount, and the vertical axis 3 is at the maximum inclination angle by lowering to the position corresponding to the horizontal neutral plane LCL. It will reach the rocking position.

Further, as the hole saw 1 descends, the holding portion 4 descends while sliding on the surface of the region below the horizontal neutral plane LCL, and the elastic member 2 returns the vertical shaft 3 together with the vertical shaft 3 to the hole saw 1. After swinging back on the vertical axis C2, as shown in FIG. 5, the hole piece q generated by the hole saw 1 being formed by the hole saw 1 Pressing against the inner surface of the peripheral wall, the cooperation of the inner surface of the peripheral wall and the holding portion 4 securely clamps the perforated piece q.

By pulling up the hole saw 1 with a drilling machine, the drilling piece q can be taken out.

Through the above steps (1) to (4), the perforation Q is formed in the main pipe A and the perforated piece q is taken out from the outside. At the time of forming the perforation Q, the holding portion 4 made of a spherical member is attached to the peripheral wall of the main pipe A. Relative to the hole saw 1 only by elastically abutting against the surface of the main pipe A, that is, the non-rotating state is maintained. Since a large frictional resistance does not work, predetermined drilling by the hole saw 1 can be performed smoothly and smoothly, and wear of the holding portion 4 itself can be extremely suppressed.

FIG. 6 shows another embodiment of the present invention, in which the elastic member 2 comprises an upper base member 11A attached to a hole saw 1.
And a plurality of coil springs 2A, 2B interposed between the lower base member 11B attached to the upper end of the vertical shaft 3 and connecting the two base members 11A, 11B. A hemisphere 3F is formed at the upper end, and this hemisphere
The vertex of 3F is brought into contact with the lower surface of the upper base member 11A, and the vertical shaft 3 with the holding portion 4 is configured to be swingable with the contact point as a fulcrum. In this embodiment, Functions and effects similar to those of the above-described embodiment are achieved.

FIG. 7 shows still another embodiment of the present invention. In this embodiment, a spherical holding portion 4 is provided at the lower end of the vertical shaft 3 by integral molding or integral formation, and a hemispherical head 3E is provided at the upper end.
The hemispherical head 3E is fitted into the hemispherical recess 1d formed in the ceiling 1C of the hole saw 1 and the hemispherical head 3E is formed.
The lower surface of 3E is supported by an elastic member 2 made of a disc spring or a coil spring, and the elastic member 2 is supported by a spring receiver 12 screwed to a ceiling C. in this case,
The vertical shaft 3 and the spherical holding portion 4 are configured to be relatively rotatable and swingable around the axis C3 of the vertical shaft 3 around the fitting portion between the hemispherical head 3E and the hemispherical concave portion 1d. In this embodiment, the same operation and effect as those of the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, when the hole saw descends while rotating to form a predetermined perforation, the perforated piece holding portion is placed in the region above the horizontal neutral plane of the tube. Oscillates radially outward of the pipe against the elastic force of the elastic member along the outer surface of curvature, and in the area below the horizontal neutral plane of the pipe, the elastic return force of the elastic member along the outer surface of the curvature of the pipe By oscillating and returning in the radial direction of the pipe, the perforated piece is pressed against the inner surface of the peripheral wall of the cylindrical main body of the hole saw via the holding portion, and at the time of completion of the perforation, the perforated piece is cylindrically connected to the holding portion. Since it can be securely clamped in cooperation with the inner surface of the peripheral wall of the main body, the perforated piece can be reliably held and taken out without dropping the perforated piece into the split joint member. After drilling, drill using magnet bar etc. This eliminates the need for cumbersome removal and collection operations such as when removing pieces, and improves the workability of the entire predetermined drilling operation.

In addition, since the piercing piece holding portion is formed of a spherical member and is attached to the lower end of the vertical axis at the sphere center so as to be relatively rotatable around the vertical axis, the lowering of the piercing piece together with the hole saw Since the holding portion does not rotate only by elastic contact with a point or a line, the rotational frictional resistance at the time of drilling does not increase, and the frictional resistance to the downward movement of the hole saw also decreases, thereby facilitating the predetermined drilling operation. Not only can it be done lightly,
The wear of the perforated piece holding portion is extremely reduced, so that a predetermined perforated piece holding function can be ensured and the life can be extended even when used for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, FIGS. 2 to 5 are partially cutaway front views for explaining a drilling operation state,
FIG. 6 is a longitudinal sectional front view showing another embodiment, FIG. 7 is a longitudinal sectional front view showing still another embodiment, FIG. 8 is a semi-longitudinal front view for explaining an example of a conventional drilling operation, FIG. 9 is a vertical sectional front view for explaining another example of the conventional punching operation. DESCRIPTION OF SYMBOLS 1 ... Hole saw 1A ... Cylindrical main body part 2 ... Elastic member 3 ... Vertical axis 4 ... Perforated piece holding part made of a spherical member A ... Original pipe (tube) C2 ... Axis line of hole saw HCL ... Vertical neutral plane of pipe LCL ... Pipe Horizontal neutral surface of Q: Perforated q: Perforated piece

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiaki Minamide 1 at 153 Tajimecho, Kishiwada-shi, Osaka Nippon Steel Pipe Fitting Co., Ltd. 57-122310 (JP, U) Jiko 62-36567 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A hole saw which is eccentric from a vertical neutral plane of a pipe, is parallel to the vertical neutral plane, and forms perforations in upper and lower peripheral walls of the horizontal neutral plane of the pipe, wherein a hole is formed in a cylindrical main body of the hole saw. A vertical shaft is attached so as to be swingable via an elastic member and always positioned concentrically with the cylindrical main body by the elastic return force of the elastic member, and is formed of a spherical member at the lower end of the vertical shaft. A piercing piece holding portion that swells in the radial direction and holds the piercing piece of the tube in cooperation with the inner surface of the peripheral wall of the cylindrical main body is relatively rotatable around the axis of the vertical axis at the spherical center thereof. A hole saw provided with a function of holding a pierced piece of a pipe, characterized by being attached.