JPH0444705Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a boring bar for drilling holes in asphalt or concrete road surfaces.

[Conventional technology]

When detecting gas leaks or water leaks using the sense of smell and hearing, first use a boring bar to drill a deep hole in the area detected by the detector, and then insert an odor rod or auditory probe into the hole. A rod is inserted to determine leakage and water leakage.

The conventional boring bar required for the above-mentioned detection work, as seen in Registered Design No. 686528, has an aperture at the tip and the upper end of the bar is housed in a handle pipe, and the handle pipe is held in the hand. By holding it and moving it up and down repeatedly, the head of the through-hole bar is struck by the cap attached to the upper end of the handle pipe, and the impact (reaction) drives the through-hole bar into the ground to penetrate the hole. It's structured.

When drilling a hole in a road surface, etc. using the boring bar configured as described above, the tip of the drilled through-hole bar may come into contact with or cut the high-voltage cable buried above ground. ,
Because high voltage current flows through the through-hole bar to the handle pipe side, electric shock accidents can occur, which is extremely dangerous.

Conventionally, the above-mentioned electric shock accidents were prevented by having workers wear rubber or other gloves when drilling, or by covering the circumferential surface of the handle pipe with an insulating layer made of rubber or plastic. .

[Problem that the invention aims to solve]

However, when drilling a hole, the handle pipe must be moved up and down repeatedly with strong force, so if you are wearing rubber gloves, your grip will become weak and you will not be able to do the job properly. As the pipe is gripped and moved up and down, the insulating layer of rubber or plastic that covers it gradually slips down to the bottom end of the handle pipe, wrinkles or tears, and the insulating effect is no longer achieved. There was a problem in that the coated insulation was slippery and could not be completely gripped, which hindered drilling operations.

Therefore, the technical problem of the present invention is to be able to perform hole drilling work using a boring bar safely without causing an electric shock accident, and to prevent the insulating layer formed on the handle pipe from shifting or wrinkling during work. The goal is to be able to grip it firmly without slipping or slipping.

[Means for solving problems]

The measures taken in the present invention to solve the above technical problems are as follows.

A through-hole bar is inserted from below into a handle pipe whose upper end opening is closed with a lid plug, and the handle pipe is repeatedly moved up and down to strike the head of the through-hole bar with the lid plug. In a boring bar configured to drive a through-hole bar into a road surface, etc., a double-sided adhesive tape is wrapped around the peripheral grip portion of the handle pipe, and the surface of this grip is covered with an insulating layer. Cover with water.

[Effect]

The above means works as follows.

Since the entire circumferential grip of the handle pipe is covered with an insulating layer, electric shock can be prevented even if the underground cable is touched during drilling work.

In order to form the insulation layer coating on the grip surface of the handle pipe wrapped with double-sided adhesive tape,
This insulating layer is firmly adhered to the double-sided adhesive tape, which solves the problem of it shifting downward or wrinkled during work, and makes it possible to ensure perfect insulation effects.

The surface of the insulating layer covering the handle pipe wrapped with double-sided adhesive tape has unevenness due to the thickness of the wrapped double-sided adhesive tape, so these unevenness acts as a non-slippery and makes drilling work smooth. However, it makes it possible to proceed safely.

As described above, the above-mentioned technical problem can be solved by the above-mentioned means, and the problems of the conventional technology can be solved.

〔Example〕

Hereinafter, preferred embodiments of the boring bar according to the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, which shows the manufacturing process of the boring bar according to the present invention, and Fig. 2, which shows an enlarged front cross-sectional view of the manufactured boring bar, the reference numeral 1 indicates the metal It is a handle pipe made of a pipe, and protrusions 2, 3, and 4 for anti-slip purposes are formed protruding in the circumferential direction at the lower end, middle section, and upper end of the pipe 1, respectively. The area between 3 and 4 is the lower grip 1a, and the area between the protrusions 3 and 4 is the upper grip 1.
It has become b. Reference numeral 1t denotes an internal chamber of the handle pipe 1, the upper end of which is closed by a lid plug body 4a that hits the head of a through-hole bar described below, and the end opening 5 of the handle pipe 1 is equipped with a through-hole bar. A retaining fitting 6 is attached.

Although the illustrated retaining fitting 6 is of a screw type, it may be of any other type such as a hook type or a tightening ring type. In addition, anti-slip protrusions 2, 3,
The number of numerals 4 and their formation positions are not limited to those shown in the drawings.

Next, 7 is a metal through-hole bar provided with a cone 7a for through-hole at the lower end and a striking head 7b at the upper end.
The root end side (the impact head 7b side) is inserted into the internal chamber 1t of the handle pipe 1 through the tip opening 5 so as to be vertically slidable.

Further, 8 indicates each grip 1 of the handle pipe 1.
A double-sided adhesive tape wound spirally or at intervals on the circumferential surfaces of a and 1b, and 9 is this double-sided adhesive tape 8.
It shows an insulating layer made of rubber or plastic that is formed to cover the entire surface of the handle pipe 1 wrapped with. The illustrated insulating layer 9 is constructed using a heat-shrinkable tube with a thickness of approximately 1 to 2 mm. Therefore, if this is placed over the surface of the handle pipe 1 and heated, the shrinkage effect and the adhesive action of the double-sided adhesive tape 8 will combine to form a strong insulating layer 9 on the surface of the handle pipe 1. I can do it. Further, on the surface of this insulating layer 9, a spiral shape or irregularities 1S at regular intervals are formed due to the thickness of the double-sided adhesive tape 8 wrapped around the inner handle pipe 1, and this serves to prevent slipping during drilling work. .

The boring bar according to the present invention is as described above, and when not in use such as during transportation, carrying, or storage, the boring bar 7 is attached to the root end side of the through-hole bar 7 (the striking head 7b) as shown in FIG. side) into the internal chamber 1t of the handle pipe 1 to shorten the entire length as much as possible, and operate the stopper fitting 6 to lock the through-hole bar 7 in the pushed-in state. Prevent accidents caused by sudden slipping out.

In addition, when using it, remove the retaining metal fitting 6 to free the through-hole bar 7, and hold the lower grip 1a with one hand from above the insulating layer 9 as shown in FIG. When the upper grip 1b is grasped, the awl 7a at the lower end is positioned at the hole, and the handle pipe 1 is repeatedly and forcefully brought down, the impacting lid plug 4a will impact the head 7b of the through-hole bar 7. This impact causes the through-hole bar 7 to descend, making it possible to make a hole for a gas leak detector or water leak detector in a road surface or the like.

Then, during this drilling work, handle pipe 1
The convex parts 2, 3, and 4 protruding from the circumferential surface of the handle pipe 1 and the unevenness 1S made of the double-sided adhesive tape 8 prevent both grips from slipping, and the handle pipe 1 can be moved up and down reliably. You can get the effect of length. In addition, the insulating layer 9 that covers the entire handle pipe 1 including the above-mentioned convex portions 2, 3, and 4 protects the worker from electric shock when the through-hole bar 7 comes into contact with an underground cable during drilling work. I can do it.

〔effect〕

As described above, according to the boring bar according to the present invention, the insulating layer coated on the handle pipe can protect the worker from electric shock. Since the adhesive tape is coated on the upper surface of the handle pipe wrapped with adhesive, the insulating layer is firmly adhered by the adhesive tape, so even if the handle pipe is repeatedly moved up and down, the insulating layer will not shift downward. There is no need to worry about it getting wrinkled or tearing, and it has a perfect electric shock prevention effect, making it possible to safely drill holes in road surfaces, etc., and the double-sided adhesive tape wrapped around the pipe surface is insulated. Since the surface of the layer has irregularities to prevent slipping, it has the advantage that drilling operations can be performed reliably and safely without the grip slipping, and it can be easily constructed and manufactured at low cost. Combined with this, its practical effects are extremely high.

[Brief explanation of the drawing]

Figure 1 is a front view showing the state in which the boring bar according to the present invention is manufactured, Figure 2 is an enlarged front sectional view of the manufactured boring bar, and Figure 3 is an explanatory view showing the state in use. It is. 1 is a handle pipe; 2, 3, and 4 are anti-slip protrusions; 4a is a cap; 5 is a tip opening; 6 is a stopper; 7 is a through-hole bar; 7a is a drill; 7b is a striking head; 8 is double-sided adhesive tape, 9 is an insulating layer.

Claims (1)

[Scope of Claim for Utility Model Registration] A through-hole bar is inserted from below into a handle pipe whose upper end opening is closed with a lid plug, and the handle pipe is repeatedly moved up and down to close the through-hole bar with the lid plug. In a boring bar configured to drive a hole into a road surface or the like by striking the head of the handle pipe, a double-sided adhesive tape is wrapped around the grip portion of the circumferential surface of the handle pipe, and This boring bar is characterized in that the surface of the grip is coated with an insulating layer.