JP7054044B2 - Chamfering tool - Google Patents

Description

The present invention relates to a chamfering tool for chamfering a pipe end.

In Patent Document 1, a cylindrical portion having a cutting edge and into which the end of a pipe to be machined is inserted, and a disk-shaped rotary torque for gripping the tubular portion by hand when rotating the tubular portion are added. A chamfering tool including a grip portion, a cylindrical portion, and a shaft-shaped portion connecting the cylindrical portion and the grip portion for applying rotational torque is disclosed.

JP-A-2002-239825

In such a chamfering tool, when it is attempted to attach a long cutting edge in the axial direction, there is a problem that the cylindrical portion and thus the chamfering tool becomes long in the axial direction. If the chamfering tool becomes long in the axial direction, there is a risk that the chamfering work will be adversely affected, for example, the rotation operation by the grip portion to which the rotational torque is applied becomes unstable.
An object of the present invention is to provide a chamfering tool that can be made compact in the axial direction and can perform chamfering work more stably.

In order to achieve the above object, the chamfering tool of the invention according to claim 1 has a cutting edge, a tubular chamfering portion for holding the cutting edge and an end portion of a pipe to be inserted, and a chamfering portion when rotating the chamfering portion. In a chamfering tool provided with an operation handle operated by an operator, a chamfering portion and a shaft portion having an outer diameter smaller than that of the operating handle, which connects the chamfered portion and the operating handle, the chamfered portion is the above. It has a cutting edge accommodating portion for holding the cutting edge, and the end portion of the cutting edge accommodating portion on the operation handle side projects from the chamfered portion to the outer peripheral surface of the shaft portion.

According to the invention of claim 1 of the above configuration, since a part of the cutting edge accommodating portion protrudes to the outer peripheral surface of the shaft portion (in other words, a part of the outer peripheral surface of the shaft portion is arranged as the cutting edge accommodating portion). Even if the cutting edge is long in the axial direction, it is possible to prevent the entire chamfered portion from becoming long and the chamfering tool from becoming long. A chamfering tool that is compact in the axial direction can stably perform the rotation operation of the operation handle and thus the chamfering work. In addition, the portion of the cutting edge accommodating portion that protrudes from the outer peripheral surface of the shaft portion can be used as a portion for hooking a finger when rotating the operation handle, further stabilizing the rotation operation of the operation handle and thus the chamfering work. It can be done.

Front view of the chamfering tool of one embodiment. Rear view of chamfering tool. Top view of the chamfering tool. Bottom view of the chamfering tool. Left side view of the chamfering tool. Right side view of the chamfering tool. Sectional view of the chamfering tool with the pipe inserted. The figure for demonstrating how to use a chamfering tool.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings.
As shown in FIG. 8, the resin pipe 101 used for the water supply / hot water supply pipe is inserted and connected to a joint (not shown), and the end of the resin pipe 101 is used to reduce the insertion force into the joint. The outer peripheral edge may be chamfered. The chamfering tool 1 of the present embodiment is used for chamfering the outer peripheral edge of the resin pipe 101.

As shown in FIGS. 1 and 7, the chamfering tool 1 includes a cutting edge 2, a cylindrical chamfering portion 3 for holding the cutting edge 2, and a cylindrical operation handle 4 as a clue when an operator operates the chamfering tool 1. And a cylindrical shaft portion 5 for connecting the chamfered portion 3 and the operation handle 4. The chamfered portion 3, the operation handle 4, and the shaft portion 5 are arranged on the same axis L and integrally molded with a synthetic resin material. As shown in FIG. 7, a lightening hole 13 is formed at the position of the axis L of the chamfering tool 1. The lightening hole 13 reaches the inside of the operation handle 4 from the inside of the chamfered portion 3 through the inside of the shaft portion 5, and is opened at the end surface of the operation handle 4.

As shown in FIGS. 1 to 4 and 7, the chamfered portion 3 has a cylindrical outer cylinder 6 into which the resin pipe 101 is inserted, a cylindrical guide pillar 7 inserted into the resin pipe 101, and an outer cylinder. An annular bottom plate 8 connecting the base end of the guide pillar 7 and the base end of the guide pillar 7 is provided on the same axis L. As shown in FIGS. 6 and 7, an annular insertion space 9 is formed in the L direction of the axis by being surrounded by the inner peripheral surface of the outer cylinder 6, the outer peripheral surface of the guide pillar 7, and the end surface of the bottom plate 8. There is. In order to facilitate insertion into the resin pipe 101, the guide pillar 7 has a tip portion 7a protruding from the insertion space 9, and the outer peripheral edge of the tip portion 7a is an R surface.

As shown in FIGS. 1 to 5 and 7, a recess 4a is formed on the outer peripheral surface of the operation handle 4. The recesses 4a are formed of long grooves that extend linearly in the L direction of the axis, and a plurality of the recesses 4a are arranged at equal intervals in the circumferential direction. The plurality of recesses 4a serve as a non-slip when the operator rotates the operation handle 4.

As shown in FIGS. 1 to 4 and 7, the shaft portion 5 is for appropriately separating the chamfer portion 3 and the operation handle 4 in order to facilitate the operation of the chamfering tool 1. The outer diameter of the shaft portion 5 is smaller than the outer diameter of the chamfered portion 3 and the outer diameter of the operation handle 4 in consideration of the reduction of the amount of meat constituting the chamfering tool 1 and the ease of gripping the operation handle 4. .. Therefore, between the chamfered portion 3 and the operation handle 4, an annular protruding space 5a centered on the axis L is formed in the axis L direction.

As shown in FIGS. 1 and 7, in the chamfered portion 3, the cutting edge accommodating portion 11 is formed so as to straddle the outer peripheral surface of the outer cylinder 6 and the outer peripheral surface of the shaft portion 5. In other words, a part of the cutting edge accommodating portion 11 provided in the chamfered portion 3 is projected from the chamfered portion 3 to the outer peripheral surface of the shaft portion 5 (hereinafter referred to as the protruding portion 11a), and the protruding space 5a is used. The ring is partially cut off by the protruding portion 11a.

The cutting edge accommodating portion 11 includes a holding recess 12 for accommodating and holding the cutting edge 2. The holding recess 12 extends linearly in the L direction of the axis in the front view (state in FIG. 1), and the axis is closer to the axis L toward the operation handle 4 in the bottom view (state in FIG. 7). It extends linearly in the L direction. At the end of the bottom surface of the holding recess 12 on the chamfered portion 3 side, a cutting tool opening 12a that communicates the inner space of the holding recess 12 and the insertion space 9 is formed. A screw hole 12b is formed in the intermediate portion in the longitudinal direction on the bottom surface of the holding recess 12.

The cutting edge 2 has a rectangular plate shape, and a cutting edge 2a is attached to one end edge in the lateral direction. A screw hole 2b is formed at an intermediate position in the longitudinal direction of the cutting edge 2. The cutting edge 2 is accommodated in the holding recess 12 of the cutting edge accommodating portion 11. The cutting edge 2 housed in the holding recess 12 has a screw hole 2b that coincides with the screw hole 12b of the holding recess 12. The cutting edge 2 is fixed to the holding recess 12 by the screw 15 inserted into the matching screw hole 2b and the screw hole 12b. A part of the cutting edge 2a of the cutting edge 2 accommodated and fixed in the cutting edge accommodating portion 11 is exposed to the insertion space 9 via the cutting edge opening 12a. A discharge recess 12c is formed in the vicinity of the blade opening 12a on the inner surface of the holding recess 12 so as to face the cutting edge 2a of the cutting blade 2.

As described above, the bottom surface of the holding recess 12 is inclined with respect to the axis L so as to approach the axis L as it approaches the operation handle 4. Therefore, the cutting edge 2 (blade tip 2a) accommodated and held in the cutting edge accommodating portion 11 is also inclined with respect to the axis line L so as to approach the axis line L as it approaches the operation handle 4. According to the inclination of the cutting edge 2, the vicinity of the bottom plate 8 of the insertion space 9 is formed in a tapered shape having a small diameter on the bottom plate 8 side.

As shown in FIGS. 7 and 8, in order to chamfer the resin pipe 101 using the chamfering tool 1 of the present embodiment, the resin pipe 101 is inserted into the insertion space 9 of the chamfering portion 3 to form the resin pipe 101. The tip is brought into contact with the cutting edge 2. In this state, when the chamfering tool 1 is rotated via the operation handle 4 and the chamfering tool 1 and the resin pipe 101 are relatively rotated, the cutting edge 2 inclined with respect to the tip of the resin pipe 101 is outside the tip. Chamfer by scraping the periphery. The shavings of the resin pipe 101 generated at this time are discharged to the outside through the discharge recess 12c.

Then, by performing the relative rotation between the chamfering tool 1 and the resin pipe 101 at a predetermined rotation number, the resin pipe 101 advances in the insertion space 9 in the axis L direction and eventually comes into contact with the bottom plate 8, and thus the tip of the resin pipe 101. Will be chamfered in a shape along the taper shape on the inner side of the insertion space 9.

As described in detail above, in the chamfering tool 1 of the present embodiment, a part of the outer peripheral surface of the shaft portion 5 is used for arranging the cutting edge accommodating portion 11. Therefore, even if the cutting edge 2 is long in the axis L direction, the chamfering portion 3 does not become long in the axis L direction, so that the chamfering tool 1 can be made compact. The chamfering tool 1, which is compact in the axis L direction, can stably perform the rotation operation of the operation handle 4, and thus the chamfering work.

Further, in the cutting edge accommodating portion 11, the protruding portion 11a of the shaft portion 5 toward the outer peripheral surface can be used as a portion for hooking a finger when rotating the operation handle 4. Therefore, the rotation operation of the operation handle 4 and the chamfering work can be performed more stably.

<Modification example>
The present invention can also be implemented, for example, in the following embodiments.
○ Separate the guide pillar 7. Then, guide columns 7 having different outer diameters are prepared so as to be compatible with resin pipes 101 having different inner diameters.

1 ... Chamfering tool, 2 ... Cutting blade, 3 ... Chamfering part, 4 ... Operation handle, 5 ... Shaft part, 11 ... Cutting blade accommodating part, 101 ... Pipe.

Claims (1)

A cutting edge, a cylindrical chamfered portion that holds the cutting edge and the end of the pipe is inserted, an operation handle operated by an operator when rotating the chamfered portion, and the chamfered portion and the operation handle. In a chamfering tool provided with a chamfering portion and a shaft portion having an outer diameter smaller than that of the operating handle, which connects with and
The chamfered portion has a cutting edge accommodating portion for holding the cutting edge, and the end portion of the cutting edge accommodating portion on the operation handle side projects from the chamfered portion to the outer peripheral surface of the shaft portion. , The chamfering tool in which the cutting edge is housed in the cutting edge accommodating portion over the protruding portion from the chamfering portion .

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