WO2002002264A1

WO2002002264A1 - Ratchet pipe cutter

Info

Publication number: WO2002002264A1
Application number: PCT/JP2001/005447
Authority: WO
Inventors: Shouichirou Kimura; Genichirou Suzuki
Original assignee: Kyoto Tool Co., Ltd.
Priority date: 2000-06-30
Filing date: 2001-06-25
Publication date: 2002-01-10
Also published as: JP2002018636A; AU2001266328A1

Abstract

A pipe cutter capable of being used as a rotary pipe cutter with an excellent work efficiency in a large working space and used as a ratchet pipe cutter in a small working area, comprising a main body having a grip part and a pair of tip parts of C-shape in side view, a rotating body of C-shape in side view installed between the pair of tip parts, a sliding body installed slidably on the rotating body, and a cutting blade installed on the sliding body, wherein the tip parts of the main body and the rotating body form a ratchet mechanism and a pair of rollers are fitted pivotally on the rotating body so as to face an opening part, a coiled spring is installed in the sliding body and the cutting blade faces the pair of rollers and positioned apart sideways from the center axis of the coiled spring, and the cutting blade presses a cut pipe continuously by the resilient force of the coiled spring.

Description

Specification

Ratchet pipe cutter

Technical field

TECHNICAL FIELD The present invention relates to a pipe cutter for cutting a pipe such as a steel pipe, a copper pipe, a lead pipe, and a stainless steel pipe by a worker holding a grip portion by hand.

Background art

As is well known, there are a rotary type and a ratchet type in the pipe cutter, and the utility model registration No. 2549490 discloses that a coil spring is biased from the coil spring original end to the tip end. A roller blade is positioned on the leading end side on the center axis of the coil spring, and the pair of support rollers and the roller blade sandwich the pipe to revolve the force-titter body with respect to the pipe, thereby forming the coil spring. A rotary pipe cutter for cutting while continuously pressing a roller blade against a pipe by an elastic restoring force is disclosed.

Also, in Japanese Patent No. 2509869, a tip having an opening is formed in a forked shape so as to face each other, a ratchet locking claw is attached to the inner surface thereof, and a ratchet wheel feed pin is fixed. A rotating body with an opening on one side and a rim with a gear carved on the inner circumference on both sides, two receiving rollers mounted on the rotating body, and a threaded rod with ratchet wheel And a cutting blade mounted to be able to move forward and backward through the shaft, and the shape of the ratchet wheel at the tip of the screw rod is substantially swastika in cross section and in a helical shape, and at least one of the two receiving rollers is used. A ratchet-type pipe turret having a stopper provided coaxially with a roller is disclosed.

The rotary set pipe cutter is used to cut a pipe during a pipe cutting operation. There is an advantage that the pipe can be cut efficiently because there is no useless operation to press the blade once again.However, the entire tool must be rotated with respect to the pipe, and it cannot be used in a place with a small working space. There was a problem.

Further, since the ratchet type pipe cutter cuts the pipe by rotating only the rotating body with respect to the pipe by a ratchet mechanism, the rotary type pipe cutter can work even in a narrow space where the cutting work cannot be performed with a rotary type pipe power cutter. Although it has the advantage, the cutting blade was screw-fed in the axial direction of the pipe by rotating the rotating body once with respect to the main body.

Therefore, the inventor of the present invention can use a highly efficient mouth-type pipe cutter in a place with a large work space, and in a place with a small work space in which the entire tool cannot be rotated with respect to the pipe. The technical challenge was to provide a pipe cutter that had the advantages of both types, which could also be used as a ratchet type pipe cutter. A coil spring is used for the cutting blade delivery mechanism of the pipe cutter, and the cutting blade is positioned parallel to the center axis of the coil spring by cutting the cutting blade at a position laterally separated from the center axis of the coil spring by the spring force of the coil spring. , The coil spring storage part protrudes from the main body and is provided. It is unnecessary and can be used as a ratchet type pipe cutter in a place with a small work space as before, and in a place with a large work space, the spring of the coil spring can be used without rotating the rotating body relative to the main body. The remarkable knowledge that the cutting blade can be continuously sent out toward the pipe by the generated force and that the entire tool can be made compact has been obtained, and the above-mentioned technical problem has been achieved. Disclosure of the invention The technical problem can be solved by the present invention as described below.

That is, the pipe cutter according to the present invention includes a main body including a grip portion and a pair of C-shaped front end portions in a side view, the front and both side walls of the grip portion extending in a bifurcated shape and having a main body side opening and facing each other. A C-shaped rotator that is rotatably mounted via a rim between the pair of tips, a slidable member that is slidably mounted on the rotator, and a cut that is mounted on the slidable member. And a blade, and a ratchet engaging claw is provided on a C-shaped tip portion of the main body in a side view, and a rim inner peripheral surface of the rotating body is provided on the inner peripheral surface of the rim. A gear that engages with the ratchet locking claw is engraved to form a ratchet mechanism, and a pair of rollers is protruded from the main body side opening of the rotating body so that the opening is desired. The sliding body is rotatably mounted on the shaft. A spring is mounted, the cutting blade faces the pair of rollers at an equal distance across the opening, and is positioned at a position laterally away from a center axis of the coil spring. The pipe to be cut inserted into the opening and brought into contact with the pair of rollers is continuously pressed in parallel with the central axis by the elastic force of the coil spring. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1

FIG. 1 is a front view showing a pipe cutter according to the present invention, FIG. 2 is a bottom view showing the pipe cutter shown in FIG. 1, and FIG. 3 is a pipe cutter shown in FIG. FIG. 4 is a plan view of the rotating body, FIG. 4 is an explanatory view showing a ratchet locking claw at the tip of the main body of the pipe cutter shown in FIG. 1, and FIG. 5 is a sectional view of the pipe cutter shown in FIG. Fig. 6 is a vertical sectional view taken along line A. Fig. 6 shows the structure of the rotating body. FIG. 7 is a longitudinal sectional view showing the movement of the sliding body in the rotating body. In these figures, 1 is a grip portion which is gripped by an operator during a pipe cutting operation. A main body 6 comprising a pair of C-shaped front end portions 5, 5 'having side opening portions 4, 4' in which the front side walls 3, 3 of the grip portion 2 extend bifurcated and face each other; A C-shaped rotator 7 rotatably mounted between the tips 5, 5 ', a slide 8 slidably mounted on the rotator 7, and a slidable body 8 mounted on the slide 8 And a cutting blade 27. As shown in FIG. 4, the ratchet locking pawls 10 and 10 are provided with the torsion coil panels 11 and 11 on the inner surface 9 of the back curved portion of the one-sided distal end 5 of the distal ends 5 and 5. They are urged in the same direction and are separated from each other while being prevented from resilience of the torsion coil panels 11 and 11 by the pins 12 and 12. The inner surfaces of the tips 5 and 5 are separated. On the other hand, concentric guides 13 and 13 are formed symmetrically around the ratchet locking pawls 10 and 10 except for the outer peripheral edges of the tips 5 and 5 '.

As shown in FIG. 6, the rotating body 7 has rims 14, 14, formed at both ends of a narrow cylinder, and both side walls formed on the inner wall while leaving the rims 14, 14 ′. A front portion 16 having a C-shape in side view and including the peripheral wall of the narrow cylinder so as to form an opening 15 having substantially the same shape as the openings 4, 4; A substantially C-shaped case body comprising a rear curved portion 17 on the inner side of the rear curved portion of the rear curved portion, the inside of which is shaped so that the sliding body 8 can be slidably mounted, and which has a U-shaped outer shape so as to be able to be stored. 18 and a pair of rollers 19, 19 rotatably arranged on one inner surface of one of the side walls of the front portion 16, and the rollers 19, 19 are provided. As shown in FIG. 3, the rollers 19 and 19 are provided with a roller opening so as to support the pipe to be cut (see FIG. 7) 20 inserted into the opening 15 of the front part 16. 1 5 As shown in FIG. 6, the narrow cylindrical peripheral wall on the opposite side to the narrow cylindrical peripheral wall on the side of the rollers 19, 19 is configured so that the sliding member 8 can be inserted thereinto. Both sides A round hole 2 1 through which a feed screw 30 described later is inserted is formed on the upper surface of the rear portion 17 formed on the narrow cylindrical peripheral wall of the rollers 19, 19 on the side of the rollers 19, 19. Are provided. As shown in FIG. 3, a gear 22 engaging with the ratchet locking claws 10, 10 is engraved on the inner peripheral surface of the rim 14, and a gear of the rotating body 7 is formed. The rotating body 7 and the ratchet locking claws 10 and 10 of the main body 6 are ratchet-engaged with the main body 6 so that the rotating body 7 can rotate only in one direction (the direction of arrow X in FIG. 5). It has become.

As shown in FIG. 6, the sliding body 8 was closed by providing a round hole 23 fitted on the upper surface side round hole 21 on the upper surface side of the case body 18 through which the feed screw 30 passed, and the bottom surface was opened. L-shaped side view formed by the rectangular cylindrical holder 24 and the forked bearing support pieces 25, 25 protruding from the bottom side walls at right angles to the longitudinal direction of the rectangular cylindrical holder 24. A cutting blade holder 26, a cutting blade 27 pivotally mounted between the two bearing support pieces 25, 25, and a play inserted into the rectangular cylindrical holder 24 with play. Spring 28, the bolt-shaped feed screw 30 provided with a knob knob 29 at the tip, and the inside of the square cylindrical holder 24 having the same shape as the inner peripheral shape of the square cylindrical holder 24. A feed nut 31 having an outer peripheral shape capable of reciprocating the same and having a nut tube in the center of which a tip of the feed screw 30 is screwed, and the rectangular cylindrical holder The inner periphery 2 4 of the opening-side end through a said transmission Ri nut 3 1 and a C-ring retaining ring 3 2 which is fixed in a state of pressing the spring 2 8. On both side walls of the rectangular cylindrical holder 24 from which the support pieces 25, 25 protrude, convex guides 33 running in the longitudinal direction of the rectangular cylindrical holder 24 are provided from the bottom end. In addition to being formed up to the upper surface end, a groove-shaped guide portion 34 is formed on the upper surface of the convex guide portion 33 from a position where the groove-shaped guide portion 34 does not reach the upper surface end.

Therefore, in the rotating body 7, the convex guide part 33 of the rectangular cylindrical holder 24 is fitted on the inner wall of the rear part 17 of the rotating body 7 on which the sliding body 8 is slidably mounted. A guide groove 35 passing therethrough is formed, and the feed screw 30 and the feed nut 3 are formed at the open end of the rear wall 17 inside the guide groove 35 by excessively rewinding the feed screw 30. A projecting portion 36 is formed so that the sliding member 8 does not fall off the case member 18 when the screw engagement with 1 is released.

Then, as shown in FIG. 6, the sliding body 8 passes the tip of the feed screw 30 passed through the rear round hole 21 of the case body 18 through the round hole 23 of the rectangular cylindrical holder 2, and further, as shown in FIG. After inserting the spring 28 into the rectangular cylindrical holder 24 and screwing the tip of the feed screw 30 into the feed nut 31, the bolt part 37 of the feed screw 30 is The spring 28 and the feed nut 31 are housed in the rectangular cylindrical holder 24 and the C ring retaining ring 32 is fixed to the rectangular cylindrical holder 24 and slides on the rear part 17 of the case body 18. It is mounted as possible (see Fig. 7). The retaining ring 32 prevents the spring 28 and the feed nut 31 inserted into the rectangular cylindrical holder 24 from falling out of the rectangular cylindrical holder 24.

The cutting blade 27 of the sliding body 8 attached to the case body 18 faces the rollers 19, 19 of the case body 18 at the same distance from each other across the opening 15 and feeds the sliding body 8. screw

By turning 30, the feed nut 31 screwed with the feed screw 30 is shifted toward the knob 29 of the feed screw 30, and the spring 28 in the rectangular cylindrical holder 24 is turned by the feed screw. The cutting blade 27, which is urged in the direction of the knob 29 of 30 and is located on the center axis of the spring 28 at a position laterally away from the tip side of the feed screw 30, is provided with rollers 19, The pipe to be cut 20 abutted on 19 is continuously pressed in parallel with the central axis by the elastic force of the spring 28.

Precutting blade 3 9 is bolted to recess 3 8 formed on the rear back of case body 18

It is detachably fixed by 40.

The shape of the rectangular cylindrical holder 24 may be a square other than a square (for example, a pentagon or a hexagon). Next, the operation (action) will be described.

The pipe to be cut 20 is inserted into the opening formed by the openings 4 and 4 of the main body 6 and the opening 15 of the rotating body 7, and comes into contact with the rollers 19 and 19 of the case body 18 (see FIG. (See (a) in the figure). Then, the feed screw 30 is turned to bring the cutting blade 27 of the slide 8 into contact with the pipe 20 to be cut (see (b) of FIG. 7). Even if the feed screw 30 is further turned after the cutting blade 27 comes into contact with the pipe to be cut 20, the sliding body 8 moves because the cutting blade 27 is in contact with the pipe to be cut 20. However, the feed nut 31 screwed into the feed screw 30 is moved closer by the screw feed action, and the spring 28 is moved between the inside of the upper surface of the rectangular cylindrical holder 24 and the feed nut 31 accordingly. It is compressed (see (c) in Fig. 7). Since the cutting blade 27 is continuously pressed against the pipe 20 to be cut by the resilient force of the compressed spring 28, the cutting is performed continuously with the cutting by the cutting blade 27. The blade 27 is sent out toward the pipe 20 to be cut.

When the main body 6 is rotated in the direction of arrow Y shown in FIG. 5 while holding the nip 2 of the main body 6 with the pipe 20 to be cut fixed, the ratchet locking claws 10, 10 of the main body 6 are rotated. Is locked to the gear 22 engraved on one of the rims 14 of the rotating body 7, so that the cutting blade 27 turns around the pipe 20 to be cut by an amount corresponding to the rotation of the drip portion 2. A notch is cut into the outer periphery of the pipe 20 to be cut, and then the grip portion 2 of the main body 6 is returned in the direction opposite to the arrow Y direction. Only idle.

Therefore, in a place where the working space is narrow, by repeating the above operation, only the rotating body 7 orbits the outer periphery of the pipe 20 to be cut, and the cutting blade 27 is continuously driven by the elastic force of the spring 28. Since it is in a state of being sent out toward the pipe to be cut 20, the cutting blade 27 bites into the pipe to be cut 20 by the orbiting operation of the rotating body 7, and a cut is cut in the outer periphery of the pipe to be cut 20. And the pipe to be cut 20 is Be cut off.

In a place where the entire tool can be turned around the pipe 20 to be cut in a wide work space, if the main body 6 is continuously rotated in the direction of the arrow Y, only the turning of the drip portion 2 can be performed. The cutting blade 27 rotates around the outer circumference of the pipe 20 to be cut, and a cut is cut in the outer circumference of the pipe 20 to be cut, and the cutting blade 27 continues to be cut by the elastic force of the spring 28. , The cutting blade 27 digs into the pipe 20 to be cut by the orbiting operation of the entire tool without the action of the ratchet mechanism, and a cut is cut into the outer periphery of the pipe 20 to be cut. The pipe to be cut 20 is cut.

Embodiment 2

This embodiment is a modification of the first embodiment. FIG. 8 is a perspective view showing a sliding body in the pipe cutter according to the present embodiment. The same reference numerals as those in the figure denote the same or corresponding parts, and 41 denotes a concave guide part 43 running on the cylindrical holder 24 in the longitudinal direction at a symmetrical position on the peripheral wall of the cylindrical holder 14. A sliding body formed from one end to the upper end, and a rotating body (not shown) on which the sliding body 41 is slidably mounted is provided with an inner wall of a rear portion 17 of the cylindrical holder 42. A guide projection (not shown) is formed to fit in the concave guide 43 and pass therethrough.

In the pipe cutter according to the present embodiment, the same operation and effect as those of the first embodiment can be obtained.

Embodiment 3.

This embodiment is a modification of the first embodiment. FIG. 9 is a vertical cross-sectional view illustrating the relationship between a round hole formed in a case body and a feed screw in a pipe cutter according to the present embodiment. In this figure, the same reference numerals as those in FIGS. 1 to 7 denote the same or corresponding parts. In the present embodiment, the thickness of the upper surface of case body 18 in which round hole 21 is formed is increased so that the direction perpendicular to the axial direction of feed screw 30 inserted into round hole 21 is increased. Wobble can be prevented. Therefore, the convex guide portion 33 of the rectangular cylindrical holder 24 and the guide groove portion 35 of the rotating body 7 in the first embodiment are not necessarily required.

Embodiment 4.

The present embodiment is a modification of the first embodiment, and FIG. 10 is a cross-sectional view showing a relationship between a case body and a sliding body in a pipe force cutter according to the present embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 7 denote the same or corresponding parts, and reference numeral 44 denotes a square having no convex guide portion 33 of the rectangular cylindrical holder 24 in the first embodiment. This is a sliding body composed of a cylindrical holder 45. The inner wall of the rear part 17 of the rotating body 7 has a space for the forked bearing support pieces 25, 25 of the cutting blade holder 46 to reciprocate. Guide projections 48 and 48 projecting to the front surface 47 where the pieces 25 and 25 are provided are formed.

In the pipe cutter according to the present embodiment, the same operation and effect as those of the first embodiment can be obtained. Industrial applicability

According to the present invention, it is possible to provide a pipe cutter that can be used not only in a place where the working space is wide, but also in a place where the working space where the whole tool cannot be rotated with respect to the pipe to be cut is narrow. Further, since the coil spring can be stored in the tool body, a compact pipe cutter can be provided. Therefore, it can be said that the industrial applicability of the present invention is very high. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view showing a pipe cutter according to the present invention.

FIG. 2 is a bottom view showing the pipe cutter shown in FIG.

FIG. 3 is a plan view of a rotating body in the pipe cutter shown in FIG. FIG. 4 is an explanatory view showing a ratchet locking claw at the tip of the main body of the pipe cutter shown in FIG.

FIG. 5 is a vertical sectional view taken along line AA of the pipe force cutter shown in FIG. FIG. 6 is an exploded perspective view illustrating the structure of a rotating body.

FIG. 7 is a longitudinal sectional view showing the movement of the sliding body in the rotating body.

FIG. 8 is a perspective view showing a sliding body in the pipe force cutter according to the present embodiment.

FIG. 9 is a longitudinal sectional view for explaining the relationship between a round hole formed in a case body and a feed screw in the pipe cutter according to the present embodiment.

FIG. 10 is a cross-sectional view showing a relationship between a case body and a sliding body in the pipe cutter according to the present embodiment.

Explanation of reference numerals

1 Pipe cutter

2 Grips

3, 3 'forward both side walls

4, 4 'Body side opening

5, 5 'tip

6 Body

7 rotating body Sliding body

, Back curve inside

0, 10 Ratchet locking claw 1, 1 1 Twisted pinion 2, 1 2 pin

3, 13 Concentric guides 4, 14, rim

5 Opening

6 Front

7 Rear

8 Case body

9, 1 9 rollers

0 pipe to be cut

1 Round hole

2 gear

3 Round hole

4 Holder

5, 25 Supporting piece

6 Cutting blade holder

7 Cutting blade

8 Spring

9 Knob

0 Lead screw

1 Feed nut

2 retaining ring Convex guide Groove guide Guide groove Projection Porto 4

Pre-cutting blade Bolt Sliding body HONOLEDA Concave guide Sliding body HONOLEDA Front

4 8 Guide projection

Claims

The scope of the claims

A main body comprising a pair of C-shaped front end portions in a side view, in which the grip portion and the front side walls of the grip portion extend bifurcated and have a main body side opening portion and face each other, and a rim interposed between the pair of front end portions. A pipe cutter comprising a C-shaped rotating body which is rotatably mounted in a side view, a sliding body slidably mounted on the rotating body, and a cutting blade mounted on the sliding body. Further, a ratchet locking claw is resiliently provided at a C-shaped front end of the main body in a side view, and a gear engaged with the ratchet locking claw is provided on an inner peripheral surface of a rim of the rotating body. A pair of rollers are rotatably mounted on the rotating body so that the pair of rollers protrude from the opening on the main body side so that the opening is desired. A coil spring is mounted in the sliding body, and the cutting blade is The cutting blade is inserted into the opening and is positioned laterally away from the center axis of the coil spring, facing the pair of rollers at the same distance from the opening. A pipe cutter characterized in that a pipe to be cut which is brought into contact with said roller is continuously pressed in parallel with said central axis by the elastic force of said coil spring.