JPS6035549Y2 - Retractable reaming device for thread cutting machine - Google Patents

Description

[Detailed Description of the Invention] The present invention has a first position that is in contact with the inner 5 walls of the center hole provided in the goo head body and is completely retracted from the passage of the cut pipe to be threaded by the chaser, and This relates to a retractable reamer device for a thread cutter that is pivoted so as to freely swing between a second position diagonally touching the inner surface of the tip edge of the thread cutter and controls protrusion to the second position only when necessary.

In a thread cutting machine, a triangular plate-shaped reamer is known that can be freely inserted from the rear surface of the gouging head main body and has its center tip projected into the center of the center hole between the holes of the gouging head.

However, since the reamer protrudes into the passage of the pipe to be cut, it is troublesome to remove it from the back of the Goui head body when it is not needed and attach it to the main body only when necessary. Although it is an accessory, since it is a completely separate item, there is a high risk of losing it during removal, making it extremely troublesome to use.

The purpose of the present invention is to eliminate such drawbacks. Specifically, the present invention is designed to provide a guinea pig on the back surface between chaser insertion grooves provided at equal angular intervals on the head body, and approximately on the inner circumferential wall of the center hole of the head body. The reamer is characterized by a first position in contact with the reamer and a rod-shaped reamer projecting diagonally toward the center of the center hole that is freely movable and pivotally supported.When not in use, the first position
Since it can be swung into position and retracted without colliding with the pipe to be cut, there is no risk of losing it, and it can be easily used at any time.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 indicates the main body of the goo head, and FIG. 1 shows the back side thereof.

A support arm 3 with a cutout 2 that fits into a support shaft protrudes from one side of the head body, and an operation arm 5 with a blade-like piece 4 that fits into a receiving piece and positions the cutting on the other side. A plurality of chaser insertion grooves 6 (four in this example) are provided at equal angular intervals on the front surface, in which radial protrusions 7 protruding from the rear surface are cut rearward, and a center hole is formed in the center. 8 will be provided.

Into the chaser insertion groove 6, chasers 9 are inserted one by one, which move to a radially inward thread cutting position and a radially outer thread cutting upper position (shown).

The movement of the chaser 9 is performed as is known in the art.
A ring-shaped cover (not shown) that allows reversible rotation is attached to the front surface of the chaser 9, and the inner surface of the chaser 9 is engaged with each of a plurality of spiral cams formed on the inner surface of the cover. Apply by rotation.

In this embodiment, a mounting seat 11 having almost the same degree of rearward protrusion as the protrusion 7 is provided between adjacent chaser insertion grooves 6 on the back surface of the goo head main body 1, as shown in FIGS. 1 and 2.
1, a U-shaped mounting piece 12 with the mounting groove 14 in the radial direction of the head body 1 is attached, and a support shaft 15 whose center almost coincides with the hole wall 8a of the center hole 8 is attached to both side wall pieces of the mounting piece 12. 1
The bent part of the rod-shaped reamer 17, which is bent in an F-shape and approximately matches the width W of the mounting groove 14, is fitted onto the support shaft 15, and is loosely fitted onto the shaft, so that one end The other end of the coil-shaped spring 16, which is attached to the mounting piece 12, is attached to the reamer 17 inside the support shaft 15.

The reamer 17 brings the linear cutting blade part 18 into contact with the hole wall 8a of the center hole 8 as shown by the chain line in FIG. It moves to a first position where it springs, and a second position where the blade part 18 points toward the center of the center hole 8 and protrudes diagonally forward.In the second position, the cut pipe a that is fed through the center of the center hole It protrudes obliquely from the rear end edge toward the center, and chamfers the inner periphery of the end surface by the protrusion.

A blind hole opened toward the outer periphery of the support shaft 15 is provided in the side wall 13 at one end of the mounting piece 12, and the spring 20 is inserted into the engagement ball 2.
1 is fitted therein, and the support shaft 15 is provided with a holding hole 22 into which a part of the engagement ball 21 is fitted in the rotational phase of the second position.

In this embodiment, the reamer 17 is placed in the first position shown by the chain line in FIG. 2
The position is held by fitting into 2.

The present invention has the configuration as exemplified above, in which the reamer 17 is attached to the Goui head main body 1 by the support shaft 15, and when not in use, it is brought into contact with the inner hole wall 8a of the center hole 8 between the chasers 9, so that the chaser 9 moves forward and backward. The reamer 17 is retracted to the first position where it does not obstruct the passage of the pipe to be cut, and protrudes to the second position only when necessary, and since the reamer 17 is attached to the head main body 1 as described above, it cannot be lost. There is no fear of this, and the protruding movement to the second position when necessary can be easily operated with a fingertip on the rear surface of the goo head main body 1.It is not large like conventional products, and has the effect of making handling convenient. Motsu.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of the back side of the goo head main body 1, FIG. FIG. 1...Gui head body, 6...Chaser insertion groove, 7...Protrusion, 8...Center hole, 8a...Hole wall , 9... Chesor 1
2...Mounting piece, 15...Support shaft, 17
... Reamer, 18 ... Cutting blade section, 19
...Bundle section.

Claims (1)

[Scope of utility model registration request] A plurality of chaser insertion grooves into which chasers are inserted to move to a radially inner thread cutting position and an outer thread cutting position are provided at equal angular intervals, and each chaser at the thread cutting position is protruded from the center of the pipe to be cut. The back surface between the chaser insertion grooves of the Goo head main body, which has a center hole for passing through, is displaced into a first position where it is almost in contact with the inner circumferential wall of the center hole, and a second position where it projects diagonally toward the center of the center hole. A retractable reamer device for a thread cutting machine, characterized in that a rod-shaped reamer is freely movably supported and installed.