JPH11351484A - Synthetic resin conduit scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin conduit scraper that is able to perform the cutting of a peripheral surface at the pipe end of a plastic pipe to be fushed and the chamfering of a pipe end face simultaneously, prior to a fusion with a plastic pipe joint. SOLUTION: This synthetic resin conduit scraper 1 is comprised of a scraper body 11 rotatable in the circumferential direction in a state that the pipe end is inserted from one end side, a blade 12 whose cutting edge 121 is made to be free of contact with an outer surface of the pipe end of this plastic pipe inserted from the scraper body 11 via a fastener 14, and a chamfering part 13 installed in the part where a face plate 115 installed at the other end side of the scraper body 11 corresponds to a pipe end edge of the synthetic resin conduit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting an outer surface of an end portion of a synthetic resin pipe made of polyethylene, polypropylene, or the like so that the pipe is easily welded to the synthetic resin pipe joint prior to the fusion. The present invention relates to a scraper for a synthetic resin pipe capable of chamfering a pipe edge simultaneously.

[0002]

2. Description of the Related Art Synthetic resin pipes are used as piping materials for water distribution, water supply, drainage, gas and the like. As a characteristic of such a pipe material, when compared with a conventional metal pipe such as a cast iron pipe or a steel pipe, it does not corrode, is resistant to ground deformation such as an earthquake,
It has features such as light weight and easy work such as piping.

[0003] Above all, about January 1, 1995
In the Hyogoken-Nanbu Earthquake (Great Hanshin-Awaji Earthquake) that occurred on the 7th, many damages occurred in cast iron pipes and steel pipes used for water pipes and gas pipes, such as detachment of joints and broken pipes. On the other hand, it was proved that there was no damage with the polyethylene pipe for gas.

[0004] In particular, an EF (electrofusion) in which a synthetic resin pipe and a synthetic resin pipe joint are heated and fused by a heating wire.
When the joining is performed, the synthetic resin pipe and the synthetic resin pipe joint are integrated, and the joint does not come off even when an external force such as pulling or bending is applied. However, in the case of heat fusion, excellent fusion performance cannot be obtained unless the surface to be fused is cleaned. Therefore, it is necessary to perform an operation (scraping) of peeling the outer surface of the outer surface corresponding to the fusion bonding portion of the synthetic resin tube.

[0005] As a jig for performing this scraping,
For example, Japanese Patent Application Laid-Open No. 6-179118 proposes a scraper for plastic pipes. On the other hand, apart from this, it is also necessary to remove (chamfer) the burrs on the edge of the plastic tube. These two operations are performed separately. Therefore, it is troublesome and time-consuming, and it is cumbersome from the viewpoint of workability. In particular, chamfering has a problem that there is an individual difference in finish.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and, prior to fusion with a synthetic resin pipe joint, removes the outside of the pipe end of the synthetic resin pipe to be fused. An object of the present invention is to provide a scraper for a synthetic resin pipe that can simultaneously perform surface cutting and chamfering of a pipe edge.

[0007]

SUMMARY OF THE INVENTION The present invention provides a scraper body rotatable in the circumferential direction with a tube end of a synthetic resin tube inserted from one end, and a synthetic resin tube inserted from the scraper body. For the outer surface of the end of the resin tube,
The blade includes a blade whose cutting edge can be freely contacted via a fastener, and a chamfered portion provided on a portion of a face plate provided on the other end side of the scraper main body, the portion corresponding to a pipe edge of the synthetic resin pipe. It is a scraper for synthetic resin tubes.

[0008]

A scraper for a synthetic resin pipe according to the present invention comprises a scraper body rotatable in a circumferential direction in a state in which a pipe end of the synthetic resin pipe is inserted from one end side, and a synthetic resin inserted from the scraper body. With respect to the outer surface of the end of the pipe, a blade whose cutting edge is freely accessible via a fastener, and a face plate provided on the other end side of the scraper main body, at a pipe edge of the synthetic resin pipe. The end of the synthetic resin tube is inserted from one end of the scraper body by forming a chamfered portion provided in the corresponding part, and the blade end of the blade is rotated while rotating the scraper body, so that the end of the synthetic resin tube ends. Can be cut by contacting the outer surface of the tube, and following the cutting process, it can be pressed in further to bring the pipe edge into contact with the blade of the chamfer, and the chamfer can also be performed in one step. so Runode, better work efficiency, also,
The chamfer can be in a uniform finished state without individual differences.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing an example of the synthetic resin pipe scraper of the present invention. As shown in FIG. 1, the scraper 1 for a synthetic resin pipe of this example includes a scraper main body 11, a blade 12, and a chamfered portion 13.

The scraper body 11 is provided with a flange 112 along the circumferential direction on the outer circumference at one end side of the cylindrical portion 111.
An annular body 113 is connected by struts 114, 114 so as to face the flange 112 at a predetermined interval. A face plate 115 is provided on the other end side of the cylindrical portion 111.
The cylindrical portion 111 is provided with a plurality of slits 111a for discharging chamfer chips to the outside along the axial direction.
The scraper main body 11 is rotatable clockwise in the circumferential direction when viewed from the side where the face plate is provided, with the end of the synthetic resin tube inserted from one end side.

Between the flange 112 of the scraper body 11 and the annular body 113, one of the supports 114 is used to hold the fastener 14.
The blade 12 is provided through the handle 15.
The cutting edge 121 can be brought into contact with the outer surface of the tube end of the synthetic resin tube by tilting the handle, and by raising the handle 15, the blade edge 121 can be pulled up from the outer surface of the tube end of the synthetic resin tube. Have been able to.

A face plate 115 provided on the other end side of the cylindrical portion 111 of the scraper main body 11 has a chamfered portion 13 having V-shaped blade portions 131, 131 at a portion corresponding to a pipe edge of a synthetic resin pipe. , 13 are provided.

Hereinafter, a state in which the pipe end of the synthetic resin pipe is processed by using the synthetic resin pipe scraper 1 shown in FIG. 1 will be described with reference to FIG. First, as shown in FIG. 2A, the pipe end of the synthetic resin pipe 2 is inserted into the scraper main body 11 from one end side, and the handle 15 is turned down so that the cutting edge 121 is attached to the pipe end of the synthetic resin pipe. The scraper body 11 is manually rotated clockwise in the circumferential direction as viewed from the side where the face plate 115 is provided in a state where the scraper body 11 is in contact with the outer surface of the scraper. Thereby, the cutting edge 121 comes into contact with the outer surface of the tube end of the synthetic resin tube 2 and is cut in the circumferential direction. Subsequently, the tube ends of the synthetic resin tube 2 are sequentially pushed into the state shown in FIG. 2B, and the outer surface thereof is cut over a predetermined width.

Thereafter, the blade 12 is pulled up by raising the handle 15 until the cutting edge 121 is separated from the outer surface of the tube end of the synthetic resin tube 2 until the handle 15 is raised, as shown in FIG. In this state, the tube end of the synthetic resin tube 2 is pushed down to the other end of the tubular portion 111, and the tube end of the synthetic resin tube 2 is brought into contact with the blade portions 131 of the chamfered portions 13. , Do the chamfering. As described above, in the scraper 1 for a synthetic resin pipe of the present invention, the chamfering of the pipe end can be performed in one step following the cutting of the outer surface of the pipe end of the synthetic resin pipe 2.

FIG. 3 is a partial sectional view showing another example of the scraper for a synthetic resin pipe of the present invention. In the case of this example, the face plate 115 provided on the other end side of the cylindrical portion 111 of the scraper main body 11 has concave blade portions 141 and 141 at a portion corresponding to the tube end of the synthetic resin tube. A plurality of chamfers 14 are provided. Other structures are
Since it is the same as that described with reference to FIG. 1, the corresponding drawing number is attached and the detailed description is omitted.

FIG. 4 is a partial sectional view showing still another example of the scraper for a synthetic resin pipe of the present invention. In the case of this example, a V-shaped blade portion 151 is provided on the face plate 115 provided on the other end side of the cylindrical portion 111 of the scraper main body 11 at a portion corresponding to the pipe edge of the synthetic resin pipe in the circumferential direction. A chamfered portion 14 is provided along. The other structure is the same as that described with reference to FIG. 1, and accordingly, the corresponding drawing numbers are attached and the detailed description is omitted.

[0017]

The scraper for a synthetic resin pipe of the present invention
As described above, prior to fusion with the synthetic resin pipe joint, cutting of the outer surface of the pipe end of the synthetic resin pipe to be fused and chamfering of the pipe end are performed in one step. Efficiently,
In addition, a uniform finished state can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an example of a scraper for a synthetic resin pipe having a full blade.

2A and 2B are explanatory views illustrating a state in which a pipe end of a synthetic resin pipe is machined using the scraper for a synthetic resin pipe shown in FIG. 1; FIG. 2A illustrates an outer surface of the pipe end of the synthetic resin pipe; FIG. 4B is a partial cross-sectional view illustrating a state immediately before the end of cutting the outer surface of the tube end of the synthetic resin pipe, and FIG. FIG. 4 is a partial cross-sectional view for explaining a state in which a pipe edge is chamfered.

FIG. 3 is a partial cross-sectional view showing another example of a scraper for a synthetic resin pipe having a main blade.

FIG. 4 is a partial cross-sectional view showing still another example of a scraper for a synthetic resin pipe having a main blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scraper for synthetic resin pipes 2 Synthetic resin pipes 11 Scraper main body 12 Blades 13, 14, 15 Chamfered parts 14 Fasteners 111 Cylindrical parts 121 Cutting edges 131, 141, 151 Blade parts

Claims (1)

[Claims] 1. A scraper body rotatable in a circumferential direction in a state in which a tube end of a synthetic resin tube is inserted from one end side, and an outside of a tube end of the inserted synthetic resin tube from the scraper body. A blade having a cutting edge freely contactable with a surface via a fastener, and a face plate provided on the other end side of the scraper main body, provided on a portion corresponding to a pipe edge of the synthetic resin pipe. A synthetic resin pipe scraper comprising a chamfer.