JPH0236641Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a new pipe groove cutting device for forming a circumferential groove for a retaining ring on the outer peripheral surface of a synthetic resin pipe.

[Prior art]

As shown in Fig. 1, when connecting synthetic resin pipe A and pipe fitting B via seal ring C, pipe A will come off if this is done alone.
A retaining ring D is often used.

However, in order to use this retaining ring D, it is necessary to machine a circumferential groove E in the pipe A to fit the retaining ring D, but this groove machining must be done manually on site. There was a problem that it was troublesome and time consuming.

[Purpose of invention]

The present invention was made in view of the above-mentioned conventional problems.The part of the main body into which the pipe end is inserted and the pipe is held is used as a main body rotating part having a handle shaft, and a groove cutting blade is attached to this part in the semi-longitudinal direction. A main body rotating part cover that is movably inserted and held by a spring, is threadedly engaged with the main body rotating part, and moves in the axial direction as the main body rotating part rotates, and the main body rotating part cover is covered with the main body rotating part cover. The inner circumferential surface of is a conical surface, and this conical surface serves as a guide surface for the groove cutting blade, and the opposite end of the groove cutting blade is engaged, and as the main body rotating part cover advances and retreats in the axial direction, the groove cutting blade moves in the radial direction An object of the present invention is to provide a simple pipe groove cutting device that can easily form a circumferential groove at the end of a pipe on site by having a structure that moves forward and backward to bite into and detach from the pipe. .

[Structure and implementation examples of the idea]

Hereinafter, the present invention will be explained with reference to an embodiment of the drawings.

In FIGS. 2 to 4, reference numeral 1 denotes a bottomed cylindrical main body, which is divided into a main body rotating part 2 and a main body stationary part 3, both of which are coaxially connected with bearings so as to be relatively rotatable. The main body rotating part 2 has a pipe end receiving recess 2
Bearing seat 22 has a conical outer circumferential surface 2A having a conical outer circumferential surface 2A whose diameter increases toward the opening side.
A threaded handle shaft 23 extending from the center of the fitting portion is coaxially protruded from the outer surface of the bottom. Conical outer peripheral surface 2A of main body rotating part 2
A cutting blade insertion hole 2 is provided in the peripheral wall of the
4 and a facet discharge hole 25 shown in FIG. The inner diameter of the main body stationary part 3 is the pipe end receiving recess 2.
The bearing 4 has a cylindrical shape larger than the inner diameter of the bearing 4.
The conical outer circumferential surface 3A is connected to the conical outer circumferential surface 2A of the main body rotating section 2, and the predetermined width of the outer circumferential surface at one end is a conical outer circumferential surface 3A that is continuous with the conical outer circumferential surface 2A of the main body rotating section 2.

Reference numeral 5 designates a main body rotating part cover, which is cup-shaped and has a main body rotating part receiving recess 51 with a conical cutting blade guide inner circumferential surface 5A, and the handle shaft 23 is inserted into a screw hole 52 formed in the bottom wall. The cutting blade guide inner circumferential surface 5A faces the conical outer circumferential surface 2A so as to be movable in the axial direction. . This anti-rotation pawl 32 extends from the outer surface of the main body stationary part 3 toward the main body rotating part 2 side with a radial interval between it and the conical outer peripheral surface 3A, and an engagement groove 53 is formed on the outer surface of the main body rotating part cover 5.
It protrudes inward.

Reference numeral 6 denotes a split cylindrical pipe holder, and the half body 61 has a support rod 62 protruding in the radial direction, and the support rod 62 is inserted into the through hole 33 formed in the main body stationary part 3. and is secured with a split pin 34. A spring 7 is interposed between the pipe holder 6 and the inner surface of the main stationary portion 3 and presses the pipe holder 6 against the pipe A.

Reference numeral 8 denotes a groove cutting blade, which is inserted into the cutting blade insertion hole 24 of the main body rotating part 2 with its cutting edge facing the pipe end receiving recess 21 side of the main body rotating part 2, and as shown in FIG. As a result, the opposite end of the rotating body portion cover 5 is urged toward the cutting blade guide inner peripheral surface 51 side and protrudes from the main body rotating portion 2, and is engaged with the cutting blade guide inner peripheral surface 51. Reference numeral 10 denotes a handle, which is attached to the shaft end of the handle shaft 23 with a nut 11.

Next, a case will be described in which the circumferential groove E shown in FIG. 1 is formed in the pipe A using this apparatus.

(a) Setting the pipe Insert the side of the pipe A to be grooved into the main body 1, and insert the pipe end to the bottom of the pipe end receiving recess 21 of the main body rotating part 2. This determines the position of the circumferential groove E to be cut. Next, the pipe A is sandwiched between the halves 61, 61 of the pipe holder 6, and the pipe is held by the spring pressure of the spring 7. At this time, the cutting edge of the groove cutting blade 8 is retracted into the cutting blade insertion hole 24 of the main body rotating section 2.

(b) Grooving work Hold pipe A in one hand and turn handle 10.
Rotate the main body rotating section 2. When the main body rotating part 2 rotates, the cutting edge of the groove cutting blade 8 comes to engage with the outer peripheral surface of the pipe A and moves in the circumferential direction while cutting this. That is, when the handle shaft 23 rotates, the main body rotating part cover 5 screwed thereon advances toward the main body stationary part 3 side, that is, gradually moves to the left in the figure, since the thread of the handle shaft 23 is a reverse thread. Therefore, the groove cutting blade 8 is pushed toward the pipe A side by the cutting blade guide inner circumferential surface 51 against the elasticity of the spring 9, and the cutting edge gradually engages deeply with the pipe A, and as the handle 10 rotates. The cut gradually becomes deeper. The cutting depth is determined by the amount of advance of the main body rotating part cover 5 in the axial direction, and in this embodiment, the main body rotating cover 5 moves to the left and its bottom hits the bottom of the main body rotating part 2, causing the handle 10 to move. It is designed so that a circumferential groove E with a predetermined groove cutting depth can be obtained even if rotation becomes impossible.

(c) Pipe Removal After completing the groove cutting, the handle 10 is rotated in the opposite direction to move the main body rotating part cover 5 backward in the axial direction, that is, to the right in the figure. Since the groove cutting blade 8 receives elasticity directed outward in the radial direction by the spring 9, it moves outward in the radial direction as the main body rotating section cover 5 moves to the right, and the main body rotating section cover 5 moves backward to its original position. Then, the cutting edge comes out of the machined groove and is retracted into the cutting blade insertion hole 24 of the main body rotating section 2. Next, the pipe holder 6 is opened against the elasticity of the spring 7 and the pipe A is pulled out from the main body 1 and the holder 6.

[Effects of the invention] As explained above, with this invention, by simply inserting the pipe into the main body and rotating the handle, the groove cutting blade elastically held in the rotating part of the main body cuts the pipe as the cover of the rotating part of the main body moves in the axial direction. Since it cuts into the pipe to a predetermined depth while cutting, it is possible to easily form a circumferential groove of a predetermined depth at a predetermined position from the end of the pipe, allowing highly accurate groove machining to be performed efficiently on site. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the connection between a pipe and a pipe joint, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention.
3 is a right side view of FIG. 2, FIG. 4 is a partial external view of the main body rotating portion in the above embodiment, and FIG. 5 is a partially enlarged view showing the holding structure of the groove cutting blade in the above embodiment. DESCRIPTION OF SYMBOLS 1... Main body, 2... Main body rotating part, 3... Main body stationary part, 5... Main body rotating part cover, 5A... Cutting blade guide inner peripheral surface, 6... Pipe holder, 7... Spring, 8 ... Groove cutting blade, 9 ... Spring, 10
... Handle, 21 ... Pipe end receiving recess, 22
......, 23... Threaded handle shaft, 24... Cutting blade insertion hole, 25... Cutting chip ejection hole, 32... Detent pawl, 51... Body rotating part receiving recess, 52
...screw hole, 61 ... half-split body, 62 ... support rod.

Claims (1)

[Scope of utility model registration request] A main body rotating part having a threaded handle shaft and a pipe end receiving recess and a cutting blade insertion hole formed in the radial direction, and a cylindrical main body stationary part connected to the main body rotating part via a bearing so as to be relatively rotatable. a main body divided into two parts, a main body rotating part cover through which the handle shaft is screwed and passed over the main body rotating part so that it can move forward and backward in the axial direction, and which is prevented from rotating with respect to the main body stationary part, and a cutting edge that receives the pipe end. A grooved cutting blade that is inserted into the cutting blade insertion hole toward the recess and receives an elastic force directed outward in the radial direction, and a radial support rod, the radial support rod being inserted into the hole formed in the stationary part of the main body. and a pipe holder for elastically holding the pipe, and the main body rotating part cover has a conical cutting blade guide inner peripheral surface whose diameter decreases toward the bottom side, and the cutting blade guide has the groove on the inner peripheral surface of the cutting blade guide. A groove cutting device for a pipe, characterized in that an end protruding from the main body rotating portion and opposite to the cutting edge is elastically engaged.