JPH0118254Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drilling machine for drilling holes in gas pipes, water pipes, etc. using a cutter.

[Prior art and its problems] Since the cutting direction of the cutting tool in the conventional drilling machine is clockwise rotation, the rotating direction of the rotating shaft to which this cutting tool is attached is naturally clockwise rotation.

On the other hand, the screws cut at the base of the branch member called a water valve or service ch, which are attached to a branch part to take out a branch pipe from a gas or water pipe, are right-handed threads according to the standard. If you attach a drilling machine to a water faucet or service tee and try to drill a hole, the reaction force from the drilling will be in the counterclockwise direction, causing the screws to loosen at the attachment part of the branching member, making the drilling unstable, or causing severe damage. In some cases, the branch member may come off. For this reason, the operator is required to drill holes while checking each screw for slackness, which poses a problem of poor workability. This also applies to the case where the drilling machine is attached to the branch member with a right-handed screw.

[Purpose of the present invention] The present invention proposes a punching machine that does not cause loosening of the screw at the attachment part between the branch member joined to the presser fitting with a right-handed thread and the punching machine attached to this with a right-handed threaded joint. The purpose is to

[Structure of the present invention] The configuration of the present invention is as follows.

The lower end is fixed to a branch member such as a water faucet or a service chi which is connected to the holding metal fitting with a right-hand thread, the cutter is lowered to the main pipe by penetrating the inside of the branch member, and the cutter is rotated by a motor. 1. A drilling machine for drilling a branch hole in a main pipe, characterized in that the cutting rotation direction of the cutter is set only to the left.

[Function] The above-mentioned drilling machine connects the lower end of the drilling machine with a right-hand thread to the head of a branching member that is joined with a right-hand thread to a presser fitting attached to a conduit, starts the drilling machine, and connects the head of the branch member with a right-hand thread. When the axis of rotation is lowered, the axis of rotation descends through the bifurcation member and the blade begins to cut the conduit. During this cutting, since the blade rotates to the left, the reaction force due to the cutting causes the branch member to rotate to the right and acts in the tightening direction.
As a result, the branching member connected to the presser fitting with a right-handed thread and the punching machine connected to this branching member with a right-handed thread do not loosen.

[Embodiment and its operation] An embodiment of the present invention described above will be described in detail based on the accompanying drawings.

1 is a water main pipe, 2 is a holding fitting fixed to the main pipe 1, 3 is a water tap screwed onto the holding fitting 2 with a right-hand screw, and 4 is a drilling machine, which is connected to an electric motor. a counterclockwise rotating shaft 5' driven by the
The rotary shaft 5' has a hole saw 5 whose cutting direction is in the counterclockwise rotation direction, which is attached to the tip of the rotary shaft 5', and is further screwed into the outer periphery of an adapter 9 screwed onto the outer periphery of the upper opening of the water faucet 3 with a right-handed thread. This configuration has a tightening ring 8 on the support portion 6. Numerals 10, 11, and 12 are packings for maintaining the sealing properties between the water main 1 and the holding fitting 2, the water faucet 3 and the adapter 9, and the adapter 9 and the flange 7 of the support part 6 of the drilling machine 4, respectively. , 13 are faucets that open and close the channels within the water distribution faucet 3.

Next, an example of the use of the above-mentioned drilling machine will be explained.

First, the holding fitting 2 that fixed the water faucet 3 to the main pipe 1
, an adapter 9 is attached on this water faucet 3, and a perforator 4 is fixed thereon using a tightening ring 8.

Next, the stopper 13 is opened and the hole saw 5 is moved to the support part 6.
The hole saw 5 is lowered from position a to position b on the outer surface of the water main 1, and brought into contact with the outer surface while giving counterclockwise rotation to the hole saw 5. When the hole saw 5 comes into contact with the outer surface and starts cutting the water main 1, a reaction force is generated in the hole saw 5 from the outer surface of the water main 1, and the rotating shaft 5'
A rightward rotational force (torque) is applied to the main body of the drilling machine 4 through the screws, but this rotational force acts in the tightening direction at the threaded portions of the tightening ring 8, adapter 9, and water distribution faucet 3.

When the drilling of the main pipe 1 is completed, the rotation of the rotating shaft 5' is stopped, the hole saw 5 is pulled up to the original position above the water faucet 3, that is, the position a, and the faucet 13 inside the water faucet 3 is closed. . As a result, if fluid is flowing in the main pipe 1, it will no longer flow above the water distribution faucet 3.

[Effects of the present invention] As described above, in the present invention, the cutting rotation direction of the cutting tool (hole saw) in the drilling machine is set to the left, and the drilling is performed by giving leftward rotation to the rotating shaft. The reaction force based on this will be in the clockwise rotation direction, and therefore, the reaction force will act in the tightening direction on the branch member connected to the presser fitting with a right-hand thread, or on the drilling machine connected to this branch member with a right-hand thread. This has the effect of preventing loosening at the right-hand screw joint.

[Brief explanation of the drawing]

The figure is a sectional view showing a part of a perforated pipe, a water distribution faucet, and a perforating machine showing an embodiment of the present invention. 1... Main pipe (pipe to be perforated), 2... Holding metal fitting, 3
... water faucet, 4 ... drilling machine, 5 ... hole saw,
5'...Rotation axis.

Claims (1)

[Scope of utility model registration request] The lower end is fixed to a branch member such as a water faucet or a service chi which is connected to the holding metal fitting with a right-hand thread, the cutter is lowered to the main pipe by penetrating the inside of the branch member, and the cutter is rotated by a motor. 1. A drilling machine for drilling a branch hole in a main pipe, characterized in that the cutting rotation direction of the cutter is set only to the left.