JPH05185314A - Biting releasing mchanism in cutting tool - Google Patents

Abstract

PURPOSE:To very easily release the biting of ratchet teeth into a ratchet pawl and a reversing preventive pawl by arranging a releasing member errectedly provided on the side surface of the releasing member body in which a fitting hole for the head of a lockedly-engaging pin is formed in the eccentric position of the bottom surface. CONSTITUTION:In the case where cutting work is interrupted on the way, or the continuation of cutting work becomes impossible due to an excessive load, when it becomes necessary to return a rotary edge on the way, a releasing member 20 removed from a case is turned by inserting the head of an lockedly- engaging pin 17 into a fitting hole 21b that has been formed in the bottom surface 21a and by applying a lever action making a center of the fitting hole 21b while grasping the end of a handle 22. The projected part 21d on the side surface of the turned releasing member 20 strikes a projection 19b that has been errectedly provided on the surface of a releasing plate 19, so that the releasing plate 19 is moved in the releasing direction by cam action, and the engagement of ratchet teeth 9 with a ratchet pawl 13 and a reversing preventive pawl 14 is released. As a result, the rotary edge can be freely rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when ratchet teeth for driving a rotary blade in a ratchet type cutting tool, ratchet pawls and anti-reversal pawls meshing with the ratchet teeth are engaged with each other, release the engagement. It relates to a release mechanism for.

[0002]

2. Description of the Related Art Conventionally, a sickle-shaped rotary blade having ratchet teeth formed on the outer surface is attached to the tip of a substrate having a curved fixed blade having an inner blade at its tip so as to surround an object to be cut. The base plate is provided with a ratchet pawl that meshes with the ratchet teeth and a reverse rotation prevention pawl, and the ratchet teeth are reciprocally moved so that the mouth width of the fixed blade and the rotary blade is finally zero and positioned between them. A ratchet type cutting tool configured to cut an object to be cut is disclosed in Japanese Patent Publication No. 58-28049.

The cutting tool having the structure disclosed in this publication, after cutting an object to be cut, has a ratchet claw locked to a locking pin implanted in the substrate and a release plate connected to a reverse rotation preventing claw. The pawl and the reverse rotation preventing pawl are moved in the releasing direction to release the engagement with the ratchet teeth, and the rotary blade is set in a free state to prepare for surrounding and cutting work of the next object to be cut.

However, when the cutting tool is used for cutting, the cutting force applied to the object to be cut acts as a reaction on the ratchet pawl and the reverse rotation preventing pawl that mesh with the ratchet teeth. Therefore,
For example, when it is desired to stop the cutting work on the way or when the cutting work cannot be continued due to excessive load, the release plate is moved to disengage the ratchet teeth from the ratchet pawl and the reverse rotation preventing pawl. Therefore, when the release plate is moved in the release direction, it is difficult to move the release plate because the ratchet teeth are tightly engaged with the ratchet pawl and the reverse rotation preventing pawl. In particular, when the ratchet pawl is mechanically driven by using an electric motor or the like, it is driven with a large force, so that there is a problem that the biting is strong and the release plate cannot be pushed by hand. It was

[0005]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that the conventional ratchet-type cutting tool releasing tool causes the ratchet teeth, ratchet pawls, and reverse rotation preventing pawls to bite during the cutting operation. It is extremely difficult to cancel.

[0006]

According to a first aspect of the present invention, a sickle-shaped rotary blade having ratchet teeth formed on the outer surface is to be cut at the tip of a substrate having a curved fixed blade having an inner blade at its tip. It is mounted so that it can surround an object, and the base plate is provided with a ratchet pawl that meshes with the ratchet teeth and a reverse rotation prevention pawl, and the ratchet teeth are reciprocally moved to finally set the mouth width between the fixed blade and the rotary blade. In addition to cutting the object to be cut placed between them as zero, the release plate is planted in the base plate to release the engagement with the ratchet teeth by moving the ratchet pawl and the reverse rotation preventing pawl in the releasing direction. A release mechanism for releasing the engagement of the ratchet teeth with the ratchet pawl and the reverse rotation preventing pawl in the cutting tool locked with the stop pin, wherein the lock pin is fitted on the head at an eccentric position on the bottom surface. Mounting hole The release tool has a handle protruding from the side surface of the formed release tool body, and a protrusion provided upright along a side edge of the release plate surface on the release direction side. According to a second aspect of the present invention, a handle is projectingly provided on a side surface of a release tool body in which the release mechanism has a shape other than a cylindrical shape, and a fitting hole for fitting the head of the locking pin is formed on the bottom surface. And a ratchet tooth, a ratchet pawl, and a reverse rotation preventing pawl in the middle of the cutting work. (EN) An object of the present invention is to provide a releasing tool for a cutting tool capable of releasing the bite of the cutting tool very easily.

[0007]

When the fitting hole formed on the bottom surface of the release tool is fitted to the head of the locking pin, the tip of the handle is gripped, and the release tool is rotated about the fitting hole by levering. The protruding portion on the side surface of the release tool hits a protrusion provided on the surface of the release plate to move the release plate in the release direction by a cam action.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of the first invention, in which a cutting tool 1 is of an electric type, and a DC motor 4 is installed in a horizontal cylindrical portion 3 of a handheld case 2. The speed reduction mechanism 5 and the rotating cam 6a are arranged from the base portion to the front portion.

A plate-shaped substrate 7 is provided at the tip of the horizontal cylindrical portion 3, and a curved fixed blade 8 having a blade portion 8a at the tip is integrally extended at the tip of the substrate 7. In addition, a sickle-shaped rotary blade 10 having a blade portion 10a on the inside and ratchet teeth 9 on the outside surface is fixed to the tip of the fixed blade 8 by a shaft 12 so as to surround an object to be cut 11 such as a cable. There is.

The substrate 7 is also provided with a ratchet pawl 13 and a reverse rotation preventing pawl 14 which mesh with the ratchet teeth 9. The ratchet pawl 13 has a base end rotatably connected to a rocking plate 6c of a reciprocating mechanism 6 including a rotary cam 6a, a crank 6b, and a rocking plate 6c by a shaft 15 and has a pawl formed at the tip thereof. The spring 16 presses and meshes with the ratchet teeth 9.

The reverse rotation preventing claw 14 is rotatably supported by a locking pin 17 implanted in the base plate 7, and a spring 18 causes the claw at the tip end to press-engage with the ratchet teeth 9.

A releasing plate 19 for moving the ratchet pawl 13 and the reverse rotation preventing pawl 14 in the releasing direction is locked to the locking pin 17 for locking the reverse rotation preventing pawl 14.
The release plate 19 has a plate shape as a whole, and the ratchet pawl 1
3 and pins 13a and 14a protruding from the tip of the reverse rotation preventing claw 14 are movably connected in the releasing direction, and a protrusion 19b is provided upright along the side edge 19a on the releasing direction side of the surface. ..

Further, the release mechanism A together with the protrusion 19b.
As shown in FIG. 3, the releasing tool 20 constituting the above is formed with a fitting hole 21b to the head of the locking pin 17 at an eccentric position of a bottom surface 21a of a cylindrical releasing tool body 21 having a predetermined diameter. At the same time, a handle 22 having an appropriate length is projected on the side surface 21c.

The releasing tool 20 is housed by being fitted into a fitting recess 23 formed on the outer surface of the horizontal cylindrical portion 3 of the case 2.

In the drawings, reference numeral 24 is a battery for driving the electric motor 4 housed in the grip 25 of the case 2, and reference numeral 26 is a switch connected between the battery 24 and the electric motor 4. ..

In the cutting tool having the above-mentioned structure, the release plate 19 is manually moved to the release side to release the meshing between the ratchet teeth 9, the ratchet pawl 13 and the reverse rotation preventing pawl 14 and the rotary blade is in a free state. 2 is rotated to the position shown by the chain line in FIG. 2 to place the object to be cut 11 inside the fixed blade 8, and then the rotary blade 10 is rotated again to the position shown in the solid line in FIG. The ratchet pawl 13 and the reverse rotation preventing pawl 14 are engaged with each other and sandwiched between the fixed blade 8 and the rotary blade 10.

Next, when the switch 26 is turned on to rotate the electric motor 4, the swing plate 6c of the reciprocating mechanism 6 swings, and the ratchet pawl 13 connected to the swing plate 6c causes the rotary blade 10 to rotate the shaft 12. The fixed blade 8 rotates intermittently about the center, and the mouth width d between the fixed blade 8 and the rotary blade 10 gradually decreases.
The rotary blade 10 bites into the object 11 to be cut, and the object 11 to be cut is cut when the mouth width d becomes zero.

When it is necessary to return the rotary blade on the way, for example, when it is desired to stop the cutting operation on the way, or when it becomes impossible to continue the cutting operation due to too much load, as shown in FIG. In addition, the release tool 20 removed from the case 2 is provided with a fitting hole 21b formed in the bottom surface 21a of the release tool 20.
And the fitting hole 21b
Rotate by applying a lever action around.

The rotating release tool 21 has a protruding portion 21d on the side surface and a ridge 19 provided upright on the surface of the release plate 19.
The releasing plate 19 is moved in the releasing direction by a cam action upon hitting b, and the engagement between the ratchet teeth 9, the ratchet pawl 13 and the reverse rotation preventing pawl 14 is released, so that the rotary blade can be freely rotated.

In particular, since the releasing tool 20 can be rotated by gripping the tip of the handle 22, it is rotated by a large rotational force according to the lever principle, and the ratchet teeth 9, the ratchet pawl 13 and the reverse rotation preventing pawl 14 are connected. Even if the release plate 19 cannot be moved only by using a tight hand and using a hand, the release plate 19 can be released very easily.

FIG. 5 shows a releasing tool 20 according to another embodiment of the first invention, in which a part of the fitting hole 21b is opened to the side surface 21c. Therefore, even if the diameter is small, it can be largely eccentric, and since the position of the fitting hole 21b is exposed to the outside, the fitting can be performed while visually confirming that the fitting pin 21 is fitted to the head. Very easy to operate.

FIG. 6 shows the outline of the operation of one embodiment of the second invention. The entire structure and the structure of the cutting tool used are the same as those of the above embodiment, but the releasing tool 2 is used.
The configuration of 0 is different.

That is, in the releasing tool 21, the bottom surface 21a of the releasing tool body 21 has an elliptic cylindrical shape, and the fitting hole 21b for the head of the locking pin 17 is formed at the center position of the bottom surface 21a. Therefore, the released release tool 20 is rotated to move the release plate 19 in the release direction by the cam action with the protruding portion 21d of the side surface hitting the ridge 19b provided upright on the surface of the release plate 19 to move the ratchet teeth 9 and the ratchet teeth. Nail 1
Since the meshing with 3 and the reverse rotation preventing claw 14 is released, the rotary blade can be returned to the free state as in the embodiment of the first invention.

As described above, according to the present invention, since the releasing tool body 21 is not cylindrical, the locking pin 17 is located at the center position of the bottom surface 21a.
Even with the configuration in which the fitting hole 20b for the head is formed, the cam action can be exerted.

Of course, when the fitting hole 21b is provided at the eccentric position of the bottom surface 21a, the release plate 19 is moved by a larger cam action.

Further, in the above-described embodiment, the releasing tool 20 is fitted in the fitting recess 23 formed on the outer side surface of the horizontal tubular portion 3 of the case 2 so that it can be carried, so that it is easy to use. In addition, for example, a U-shaped leaf spring is arranged in the fitting recess 23 to release the release tool 2.
Relieve tool 2 by holding 0 as an elastic pressure or by bolts.
There is no need to worry about losing the release tool 20 by fixing 0.

[0028]

According to the present invention, a sickle-shaped rotary blade having ratchet teeth formed on the outer surface can surround an object to be cut at the tip of a substrate having a curved fixed blade having an inner blade at the tip. The base is provided with ratchet pawls and reverse rotation preventing pawls that mesh with the ratchet teeth, and the ratchet teeth are reciprocally moved to finally set the mouth width of the fixed blade and the rotary blade to zero and in between. In a cutting tool configured to cut an object to be cut, the engagement between a ratchet tooth and a ratchet pawl and a reverse rotation preventing pawl that mesh with the ratchet tooth is released by a releasing tool that utilizes a lever action and a cam action.

Therefore, for example, when it is desired to stop the cutting operation on the way or when it becomes impossible to continue the cutting operation due to too much load, the ratchet teeth for driving the rotary blade, the ratchet pawl that meshes with the ratchet teeth, and the The engagement with the reverse rotation prevention claw can be released very easily and easily,
In particular, it is most suitable when the ratchet pawl is mechanically driven by using an electric motor or the like and the engagement plate is strong and the release plate cannot be pushed by hand.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the first invention.

FIG. 2 is a front partial view in which a part of FIG. 1 is cut away.

FIG. 3 is a perspective view showing a release tool in the embodiment shown in FIG.

FIG. 4 is an explanatory view showing a releasing action in the embodiment shown in FIG.

FIG. 5 is a perspective view showing a releasing tool according to another embodiment of the first invention.

FIG. 6 is an explanatory view showing a releasing action in the embodiment of the second invention.

[Explanation of symbols]

1 ... Cutting tool, 7 ... Substrate, 8a ... Blade part, 8 ... Fixed blade, 9
... ratchet teeth, 11 ... object to be cut, 13 ... ratchet pawl, 14 ... reverse rotation preventing pawl, 17 ... locking pin, 19 ... release plate, 19a ... side edge, 19b ... ridge, 21 ... release tool,
21a ... bottom surface, 21b ... fitting hole, 21c ... side surface, 21 ...
Release tool body, 22 ... Handle, A ... Release mechanism.

Claims (2)

[Claims] 1. A sickle-shaped rotary blade having ratchet teeth formed on its outer surface is attached to the tip of a substrate having a curved fixed blade having an inner blade at its tip so as to surround an object to be cut. , The substrate is provided with ratchet pawls and reversing prevention pawls that mesh with the ratchet teeth, and the ratchet teeth are reciprocally moved to finally set the mouth width of the fixed blade and the rotary blade to zero and to be cut. In a cutting tool in which a release plate is locked to a locking pin planted in the base plate for cutting an object and moving the ratchet pawl and the reverse rotation preventing pawl in the releasing direction to release the engagement with the ratchet teeth. A release mechanism for releasing the engagement of the ratchet teeth with the ratchet pawl and the reverse rotation preventing pawl, wherein the release tool body has a fitting hole for the head of the locking pin formed at an eccentric position on the bottom surface. On the side A biting release mechanism in a cutting tool, comprising: a release tool having a handle projecting thereon and a projection provided upright along a side edge of the release plate surface on the release direction side. 2. A sickle-shaped rotary blade having ratchet teeth formed on the outer surface is pivotally attached to the tip of a substrate having a curved fixed blade having an inner blade at its tip so as to surround an object to be cut. , The substrate is provided with ratchet pawls and reversing prevention pawls that mesh with the ratchet teeth, and the ratchet teeth are reciprocally moved to finally set the mouth width of the fixed blade and the rotary blade to zero and to be cut. In a cutting tool in which a release plate is locked to a locking pin planted in the base plate for cutting an object and moving the ratchet pawl and the reverse rotation preventing pawl in the releasing direction to release the engagement with the ratchet teeth. A release mechanism for releasing the engagement of the ratchet teeth with the ratchet pawl and the reverse rotation preventing pawl, wherein a fitting hole for fitting the head of the locking pin is formed on the bottom surface in a shape other than a cylinder. Release tool Disengagement in a cutting tool, comprising: a release tool having a handle projecting from a side surface of a main body, and a protrusion provided upright along a side edge on the release direction side of the release plate surface. mechanism.