JPS58181513A - Ratchet type pipe cutter - Google Patents

Abstract

PURPOSE:To obtain an easily handled cutter, by providing a feed shaft with a ratchet teeth to a roller cutter blade placed at a face-to-face position to a contactor. CONSTITUTION:An almost semicircular arc shaped supporting arm 5 is integrally formed to a main unit 1 of a pipe cutter, and holding rollers 7 for stably holding a pipe P to be cut with a roller cutter blade 11 are rotatably supported to shafts 9 of the arm 5. A cutter blade feed shaft 13, to whose point end the blade 11 is rotatably supported by a bearing, is movably mounted in the direction of an axial line of the shaft 13 to the inside of a shaft groove 2 formed to the unit 1, and ratchet teeth 15 are formed to a bottom face of the shaft 13. Accordingly, a handle 3 is gripped to pull a feed lever 21, and the shaft 13 can be intermittently stepped advancing in the radial direction to cut the pipe P and facilitate handling with simple construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutter with a simple structure in which the blade is fed by a ratchet mechanism.

The present invention particularly provides a new and simple pistol-shaped cutter, which allows you to easily feed the cutting blade by holding the handle and pulling the feed button, which corresponds to the trigger of a pistol. The purpose of the present invention is to provide a cutter with a simpler structure and easier operation and handling than conventional ones, suitable for cutting pipes in narrow working spaces such as construction sites where gas pipes and water pipes are buried. It is.

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

The blade cutter according to the present invention has a main body l having a handle 3, and a substantially semicircular arc-shaped support arm 5 is integrally formed on the main body l. The support arm 5 is provided with at least 3 pieces of wire fP on the outer periphery of the flat wire along with the roller cutter blade 11 that cuts the wire fP to be cut.
Holding rollers 7.7 for stable holding at points are rotatably supported around shafts 9,9. The number #'i of the holding rollers 7.7 may be two or more. Furthermore, the holding roller 7.7 is preferably a rotating body, but it may also be a mere stationary contact.

Furthermore, the holding rows 27, 7 themselves are also rollers, and the cutting blade 11
It is also possible to use a three-blade type cutter with a roller blade similar to the one described above. However, if the holding roller is also configured as a roller blade, the width W of the roller in the axial direction as shown in Fig. 2 cannot be obtained, so there is a possibility that the 79igP will wobble in the axial direction. It is desirable to provide a guide arm as described below. In any case, book holding roller 7.
7 is ・f in the present invention, including the above-mentioned variations.
It has been identified as a contact for holding the tube.

A roller blade 1 is installed at the tip of the shaft groove 2 formed in the main body 1.
A cutter blade feed shaft 13 rotatably supported by a cutter blade feed shaft 13 is mounted movably in the axial direction of the cutter blade feed shaft 13, that is, in the half-shuttle direction of the flat Eve P. The feed shaft 13 has, for example, a rectangular cross section, and ratchet teeth 15 are formed on its lower surface. A ratchet pawl 23, which is rotatably supported on the feed gear 21 via a pivot pin 20, is engaged with the ratchet teeth 15. Send/
The odd-21 is rotatably supported by the main body 1 via a pivot pin 17. The claw 23≠ locks on the bottle 6 installed in the main body l, and the claw 23 feeds the pin 6 using the pin 6 as a fulcrum.
It is designed so that it can perform a see-saw movement depending on the operation. One end of a first torsion coil spring 29 provided on the main body l is pressed against the claw 23, and the claw 23 is always biased counterclockwise in FIG. The other end of the spring 29 is locked to the main body 1 or the feed lever 21. On the other hand, one end of a second threaded coil spring 31 provided on the main body 1 is locked to the feed lever 21, and the feed lever 2
1 is always urged counterclockwise around the bottle 17. 'The other end of the second barb 31 is locked to the main body l or the claw 23.

A recess 41 formed by guide walls 33 and 34 formed integrally with the main body 1 has an opening, and a recess 35 is fitted into the recess provided at the lower end of the recess. A spring 39 disposed in the groove constantly applies an upward pressing force, so that the lock pawl 35 is normally engaged with the ratchet teeth 15 of the feed shaft 13. The locking pawl 35 has a notched shoulder 36, into which the tip flange 22 of the feed/4-21 is engaged. The push-down opening and the pawl 35 can be unlocked from the ratchet teeth 13. The guide walls 33 , 34 are discontinuous in order to allow the tip hook 22 of the feed lever 21 to project into the groove 41 in order to engage the shoulder 36 of the locking pawl 35 . ratchet) claw 23, mouth, claw 35, hook 22, first. Second spring 29
, 31, etc. are arranged in a recess 4 continuous with the shaft groove 2 of the main body 1, and are not visible from the outside by fixing the lid cup 45 (FIG. 2) to the main body 1 with screws.

In the pistol-shaped 9-point cutter constructed as described above, by holding the handle 3 and pulling the feed lever 21, which corresponds to the trigger of the pistol, the feed shaft 13#f is intermittently moved in the radial direction. F'll Chi, Send Shire/? -21 is fed when it is pulled toward the handle 3 side.-21 rotates clockwise around the bottle 17, and as a result, the support shaft 2 of the claw 23
1 (therefore, pawl 23-1>1) moves in a clockwise arc around the pin 17, so that pawl 23 engages ratchet tooth 1.
5, the feed shaft 13 is advanced by one step in the A-vehicle radial direction. When the feed lever 21 is released, the spring 31
It then returns to its initial position. Therefore, feed the entire cutter and repeat +21 while moving the cutter.
If the roller cutter blade 11 is rotated around A
It can bite into Eve P and eventually cut /4 Izo P. Note that the lock pawl 35 is for preventing the feed shaft 13 from moving to the left in FIG.
The direction is as follows.

When the feed shaft 13 is returned to the initial position after the cutting of the knob P is completed, the feed shaft 7-21 can be rotated in the opposite direction away from the handle 3, that is, in the counterclockwise direction. As a result, the ratchet pawl 23 is pulled down diagonally to the left in FIG. Since the feed shaft 13 is pushed down by the hook 22 of the holder 21, the feed shaft 13 has two claws 23.
35 degrees, and the slave cutter blade 11Fi can be moved back greatly by the return spring 60.

Note that 14 is a knob of the feed shaft 13 that serves as a handle when moving the feed shaft 13 forward.

In the above configuration, in order to cut the dive P, it is necessary to rotate the entire cutter at least around the mother dive P. Depending on the work site, it may not be possible to rotate the entire cutter once around the pi fP. It is advantageous to see the roller cutter blade. That is, in that case, three different points on the outer circumference of the Tsuyaia'P will be cut at the same time with three blades, so feed the cutter by holding the handle 3.9-2
This is because it is sufficient to reciprocate within the angular range in which the bird according to No. 1 repeats the - motion.

However, in the case of such a 3-plane force, the 3 rollers and the ripping blade are all located in one plane that includes the cutting line of the 4-beam, so /4' IsoP is actually the 3-plane force. The roller cutter blade maintains only a line contact. Therefore, Neude p
or the cutter may wobble in the axial direction.
In such a case, grip means for holding the blades on both sides of the cutter body are required. As an example, a pair of scissor-shaped guide arms JOA, 50B as shown in FIG. 1-2 can be considered. Guide arm 50A.

50B is pivoted at a fulcrum 51 fixed to the feed shaft 13,
One end of the 7 is connected by a compression spring 53. A flat ear "P" is held between the other ends of the guide arms 50A and 50B.The guide arms soA and soB gradually expand as the feed shaft 13 moves forward, and continue to hold the flat ear "P" between the guide arms 50A and 50B. !The contact point with fP is shifted little by little.The strength L of the compression spring 53 is preferably set so that it can be held with a certain amount of force in its free state.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a flat cutter according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a left side view of Fig. 1. figure. l...Body, 3...Handle, 7...Holding roller, 1
1... Roller cutter blade, 13... Feed shaft, 15...
・Ratch 8° tooth, 21... Feed lever - 123...
ratchet pawl. Patent applicant: Kis Kogyo Co., Ltd. Patent attorney Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney Kyo Nakayama Patent attorney Akira Yamaguchi Figure 3 7 4y:J

Claims (1)

[Claims] 1. A main body having a handle, a plurality of flat iso-holding contacts attached to the main body, and holding a pipe at at least three points on the circumference together with a skeleton contact mounted opposite to the contacts. Roller blade, blade, and inside the above body/? It has a feed shaft with ratchet teeth that is movably attached in the radial direction and holds the roller cutter blade at its tip, and a feed lever that is pivotally supported on the main body and has a ratchet pawl that engages with the ratchet teeth of the feed shaft. The ratchet type Mideka is characterized by being able to feed the feed shaft intermittently in the radial direction of the pipe by holding the handle and operating the upper feed lever.