JPH091418A - Portable cutter - Google Patents

Abstract

PURPOSE: To make a cutter for a long size article such as a cable small, light, and excellent in handling, efficiency, and effectiveness. CONSTITUTION: A link holder 11 lineary moved in the axial line A-A direction of a main body 1, and two blade members 21 and 25 turnably supported on a cutter pin 9 fitted to a stay 6, are joined respectively by a link 17 to turn the blade members 21 and 25 in an opposite direction with each other. In the blade members 21 and 25, groove parts 22 and 26 for receiving a long size article, opened to the forward tip of the pin 9 and having nearly uniform width, are provided on the axial line A-A, and cutting is made by crossing the groove parts 22 and 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held cutting machine for cutting a long rod-shaped object made of metal or non-metal or a combination of metal and non-metal.

[0002]

2. Description of the Related Art A bar-shaped long object made of metal or non-metal, or a bar-shaped long object made of a combination of metal and non-metal, such as deformed rebars, profiles, wires and cables, As a hand-held cutting machine for cutting at construction sites, a fixed blade member and a movable blade member are arranged with their blades facing each other, and the movable blade member is swung by human power or power to close the blades. There is known a type in which a long object sandwiched between them is cut (Japanese Patent Publication No. 58-28049, JP-A-4-208).
186).

In these devices, a movable blade member is rotatably attached to the tip of a fixed blade member, a long object is surrounded by these, and the movable blade member is swung to allow the long object to bite into the blade portion to form two blade portions. The cutting is completed when the gap between is zero. The long object is inserted by separating the movable blade member from the turning drive mechanism and opening the front of the blade portion of the fixed blade member, so that the two blade portions are formed into concave arc shapes to receive and surround the long object. Is made.

Further, some of the pumps that use a fluid pressure cylinder instead of an electric motor as power have been put to practical use.
In this product, two blade members are usually movable together, and since the blade member is swung by the piston of the fluid pressure cylinder to cut a long object at once, it is more efficient and efficient than the above. It is excellent.

In this device, a long object is inserted from the tips of the two movable blade members to surround them. Therefore, the movable blade member has its tip open at an interval allowing insertion of a long object before the operation is started, and the blade portions are formed into concave arc shapes by following the manual type or the electric type. ing.

[0006]

In the above-mentioned manual type or electric type, it is necessary to separate the movable blade member from the turning drive mechanism and open the front portion of the fixed blade member to insert a long object. Therefore, not only is it inconvenient to use, but it also takes a long time from the start to the end of cutting because the movable blade member is swung little by little to continuously cut a long object little by little. Or, there is a waste of human power and power, and there is a problem in terms of efficiency.

On the other hand, the above-mentioned fluid pressure cylinder type is easy to use, and is superior in efficiency and efficiency to the manual type and the electric type, but the recessed portions of the two blade members are at the tip. Since the cutting stroke starts from a state in which the gap is larger than the gap and a considerably large gap is formed between the elongated object and the long object, the piston stroke of the fluid pressure cylinder becomes large. Therefore, the piston stroke is proportionally large for large diameter cylinders, and the fluid pressure cylinder and swivel drive mechanism cannot be increased in size and length. It is against the demand for things.

Therefore, the present invention solves the above-mentioned problems of the conventional hand-held cutting machine, is easy to use, is excellent in efficiency and efficiency, and enlarges large-diameter long objects. The purpose of the present invention is to provide a hand-held cutting machine capable of cutting without increasing the length.

[0009]

That is, the present invention firstly provides:
Two stays that extend forward and are parallel to each other are fixed to the tip of the main body including the driving mechanism, and two blade members that are overlapped with each other are rotatably fitted to the cutter pins installed on them.
A link holder that linearly moves in the axial direction of the main body by a driving mechanism and a swing drive mechanism that is composed of two links whose both ends are rotatably connected to the link holder and the two blade members are provided. Further, two blade members are provided with a groove portion for receiving a long object, which is opened to the front end of the cutter pin and has a substantially uniform width as a whole and whose rear surface in the cutting and turning direction forms a blade portion on the main body axis. , Was adopted.

Secondly, in addition to the above-mentioned first structure, the present invention secondly provides a return spring means for rotating the two blade members from a cutting end position to a position where the groove portions overlap each other, and a stop at a position where the groove portions overlap each other. It is configured to include a positioning means for performing the operation.

Further, in the third aspect of the present invention, in addition to the above-mentioned first or second configuration, a tip-end member of the two blade members is provided with an opening stop member for turning the other blade member in a state of being overlapped with each other. It was Then, the opening preventing member and the positioning means, which is provided at the two blade members and is configured to contact the opening preventing member provided at the other blade member with each other at a position where the two groove portions overlap each other, and the two blade members are cut. A return spring means for rotating the groove from the end position to the position where the grooves overlap each other is provided.

The two blade members and the links in the first, second, and third configurations of the present invention have the same dimensions,
It is preferable that the link holder is shaped and arranged symmetrically with respect to the main body axis, or that the link rod holder is coupled to the piston rod by using a fluid pressure cylinder as a driving mechanism. Further, the return spring means in the third configuration of the present invention is a screw recoil spring and is arranged so as to surround the cutter pin and both ends are locked to the stay and the blade member, or each two blade members, a link and an opening stop member. It is preferable that the stopper and the stopper have the same size and shape and are arranged symmetrically with respect to the main body axis.

[0013]

[Operation] When a rod-shaped long object, which is an object to be cut, is inserted into the two overlapping groove portions and the link holder is driven forward, the two links turn the two blade members in opposite directions about the cutter pin. Let As a result, the two groove portions move in opposite directions, and the rear surface in the turning direction performs cutting while pushing the long object in opposite directions,
Cutting is completed when the grooves completely cross each other.

Since the groove has a substantially uniform width and is not formed in a concave arc shape, there is almost no unnecessary stroke in the cutting process, and a long object having a maximum diameter equal to the width of the groove is short in the link holder. Can be cut with a stroke.

Further, when the return spring means and the positioning means are provided, the return after the completion of cutting is smoothly and accurately performed,
When the stop member is provided, the cutting is smoothly performed. Furthermore, if the blade members, links, etc. are arranged symmetrically with respect to the axis line with the same size and shape, the long object is cut from both sides with a uniform force and local overload is not caused.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. At the tip of a main body 1 containing an oil tank, a pump, a pump driving electric motor, a fluid pressure cylinder, a battery and a required fluid passage, and a control valve (not shown). , The piston rod 2 of the fluid pressure cylinder is arranged so as to be linearly reciprocated between a position substantially the same as the front end surface and a position protruding forward from this, and the axis of the piston rod 2, that is, the body 1 Axis A
A pair of U-shaped side brackets 4 are provided so as to project symmetrically with respect to -A.

A connecting portion 7 at the base end of the stay 6 is tightly fitted in each bracket 4, and a stop pin 5 inserted through these.
The two stays 6 are detachably connected to the tip of the main body 1. The stay 6 is in the form of a vertically long block as a whole, and has a boss 8 extending in a direction perpendicular to the stop pin 5 at the tip thereof. The stays 6 are fixed to the main body 1 in parallel with each other.

The link holder 11 has a U-shaped side surface, and a short cylindrical mounting piece 13 protruding from the bottom surface of the bottom plate 12 thereof.
Is fitted into a mounting hole 3 at the tip of the piston rod 2 and is detachably fixed by a retainer (not shown). The outer surfaces of two parallel receiving plates 14 contact the inward side surface of the bracket 4. There is. As a result, the link holder 11
Moves stably in a straight line in the direction of the axis AA.

Two support pins 15 are arranged symmetrically with respect to the axis AA, and these support pins 15 are provided in the link holder 11.
Both ends are fitted in and fixed to the receiving plate 14 of the above and are installed in parallel with each other. These support pins 15 are rotatably supported by penetrating the base ends of two links 17 having the same size and shape. Moreover, these links 17 are the receiving plates 1
4 are inserted with their front and rear positions shifted, and are supported by a support pin 15 by a spacer 18 so as not to move in the axial direction.

Next, the blade members 21 and 25 are made of flat plates and have the same size and shape. When these blade members are overlaid on each other, there is no space between the bosses 8 of the two stays 6. It is rotatably supported by a cutter pin 9 which is inserted and penetrates through them. Also, the two links 17 extend obliquely forward in the direction away from the axis AA,
The tip portions thereof are rotatably connected to the two blade members 21 and 25 by link pins 16 at symmetrical positions with the axis AA interposed therebetween, and the link holder 11 and the two links 17 are connected to each other. The swivel drive mechanism 10 that simultaneously rotates the blade members 21 and 25 at the same angle is configured.

The blade members 21 and 25 have an arcuate outer peripheral portion located in front of the cutter pin 9 with the cutter pin 9 as the center, open to the front end of the cutter pin 9 and have a substantially uniform width. Groove 2 for receiving long objects
2, 26 on the axis AA. In FIG. 1, the upper overlapping blade member 21 is rotated counterclockwise in the cutting stroke, and the lower overlapping blade member 25 is rotated clockwise. The surface toward the rear is a blade portion 23, 27 for cutting a long object
Is formed.

Further, these blade members 21 and 25 are provided with an end face U-shaped opening stop member 31 at the outer peripheral edge portion near the tips slightly rearward of the groove portions 22 and 26 in the cutting and turning direction with the screw 3.
2 and the other blade members 2 attached to each other.
The outer peripheral edge portions of the reference numerals 1 and 25 are fitted in a stacked state. The opening preventing member 31 prevents the blade members 21 and 25 from being twisted due to the resistance of the long object at the time of cutting and makes a gap between them to make the cutting extremely difficult or impossible. It may not be necessary depending on the nature.

Further, when the cutting is completed and the link holder 11 is retracted, the blade members 21 and 25 are rotated via the link 17, and the return spring means 33 for assisting this movement.
Is provided. The return spring means 33 includes the stays 6 on both sides and the blade members 21 facing the stays 6, respectively.
It is composed of a torsion coil spring whose both ends are locked to 25 and is wound around the boss 8 and is designed so as not to disturb the operation and carrying, but the pulling arranged in substantially the same direction as the axis AA. It may be a coil spring.

Furthermore, in the case where the return spring means 33 is provided, if there is a dimensional error or rattling of each part, the blade member 21,
There is a concern that 25 may overturn and stop at a position where the groove portions 22 and 26 do not completely overlap with each other, which may hinder the insertion of a long object. Therefore, in this embodiment, the groove portion 2 of each blade member 21, 25 is
A plate-shaped stopper 35 is attached to the opposite side of the opening stop member 31 with screws 36 sandwiching 2, 26, and the opening stop piece 31 of the other blade member 21, 25 is located at a position where the grooves 22, 26 completely overlap each other. Contacted. The opening preventing member 31 and the stopper 35 constitute the positioning means 30.

In this embodiment having such a structure, a rod-shaped long object M, which is an object to be cut, such as a cable, is used as the groove portions 22 and 26.
Is inserted into the fluid pressure cylinder until it is almost in contact with the bottom, and the pressure oil pressurized by a pump is fed into the fluid pressure cylinder to move the piston rod 2 and the link holder 11 straight forward integrally.
Therefore, the two links 17 also move forward as a unit, and the link pins 18 having their tips connected to the blade members 21 and 25 respectively move on an arc centered on the cutter pin 9 to move into the groove 22. , 26 are swung simultaneously in the direction in which the other blade members 21, 25 are shielded from each other and at the same angle in the opposite directions.

A long object M having a maximum diameter equal to the groove width is inserted in the groove portions 22 and 26, and therefore, a long object M having a smaller diameter than this.
Against this, when the piston rod 2 starts to move forward, cutting is started with a very slight useless stroke, and the blade portions 23 and 27, which are rear surfaces in the turning direction of the groove portions 22 and 26, move the long object M. Push in opposite directions and proceed with cutting along their mating surfaces. During this time, the long object M is located on the axis A-A and cut from both sides, and the cutting is completed when the grooves 21 and 25 completely cross each other and there is no overlapping portion.

FIG. 5 shows a state in which the operation is started from the inoperative position in FIG. 1 and the cutting is completed, and during this time, the two links 17 widen the distance between the tips and rotate in the directions to open each other. While having a function as a toggle mechanism that causes the blade members 21 and 25 to perform a cutting operation. That is, according to the present embodiment, there is almost no useless stroke, and the axis A--A
By making the link 17 and the blade members 21 and 25 symmetrical with respect to each other, it is possible to efficiently utilize the motive force and evenly feed the blade members 21 and 25 from both sides to the long object M for smooth cutting. it can.

In addition, in this embodiment, the end surface of the stopper 35 is located on the same plane as the blade portions 23 and 27 of the groove portions 22 and 26, whereby the long object M is cut at the time of cutting.
The end face of the stopper 35 is pushed adjacent to the position, and the portion where the long object M is held on a straight line in the vicinity of the cutting point can be lengthened to cut more smoothly.

When the cutting is completed and the pressure oil of the fluid pressure cylinder is discharged, the piston rod 2 and the link holder 11 are integrally retracted by the return spring and the return spring means 33 built in the cylinder, and the two blade members 21 and 25 are also removed. It turns in the opposite direction to the above and stops when the opening stop member 31 contacts the stopper 35.

Next, the cutting machine of the present embodiment has a link holder 1
The mounting piece 13 of No. 1 is removably fitted into the mounting hole 3 of the piston rod 2, and the connecting portion 7 of the stay 6 is detachably connected to the bracket 4 by the stop pin 5 and is attached to the main body 1. It can be used as one of the attachments in a tool in which various tools such as crimping and compressing are exchanged for use on one main body 1, and it can be accurately used by the mounting piece 13 and the fixing pin 5. Since it is positioned and attached to the main body 1, it is easy to handle. Needless to say, it may be a cutting-only machine.

It should be noted that the link holder 11 does not directly reciprocate linearly by means of a fluid pressure cylinder, but its motive power is controlled by the axis A
The linear reciprocating motion may be performed by human power or an electric motor using an appropriate transmission mechanism that converts the force in the −A direction.
Further, the stopper 35 serving as a positioning means for preventing excessive return when the return spring means 33 is provided is, for example, a pin protruding from the stay 6 and brought into contact with the outer peripheral edges of the blade members 21 and 25 at a predetermined position. May be

[0032]

As described above, the movement of the link holder, which is linearly moved by the motive force, is changed to the rotational movements of the two blade members in the opposite directions via the link, so that the groove portions of substantially uniform width provided in the blade members are formed. According to the present invention, which cuts the long objects inserted into them by changing from the overlapped state to the crossed state, the stroke of the link holder is short because there is almost no unnecessary stroke in the cutting process, and therefore the large stroke is large. It is possible to cope with a long-diameter object without increasing the size of the driving mechanism or the turning drive mechanism and increasing the size thereof. That is, it has the advantages that it is easy to insert a long object, is easy to use, is excellent in efficiency and efficiency, and is small and lightweight and easy to handle.

Further, when the return spring means and the positioning means are provided, it is possible to return to the inactive position smoothly and accurately after the completion of cutting to prepare for the next cutting work. The two blade members are overlapped with each other so that cutting can be smoothly performed.

Further, when the link and the blade members are arranged in the same size and shape as those symmetrically with respect to the axis of the main body and the long object is placed on this axis, the long object is partially passed. Efficient and reliable cutting can be performed with equal force from both sides without generating a load.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a view seen in the direction of the arrow X in FIG.

3 is a cross-sectional view taken along the line YY of FIG.

FIG. 4 is a view as seen in the Z direction shown in FIG.

5 is a front explanatory view showing a state at the completion of cutting in the embodiment of FIG.

[Explanation of symbols]

1 main body, 6 stays, 9 cutter pins, 10 turning drive mechanism, 11 link holders, 17 links, 21, 2
5 blade members, 22, 26 groove portions, 23, 27 blade portions, 30
Positioning mechanism, 31 Opening prevention member, 33 Return spring member, 35 stopper,

Claims (7)

[Claims] 1. Two parallel stays fixed to the tip of a main body including a driving mechanism and extending forward; two stays rotatably fitted to cutter pins installed on the two stays and superposed on each other. One blade member; a link holder that is linearly moved in the axial direction of the main body by the driving mechanism, and two links whose both ends are rotatably connected to the link holder and each of the two blade members. A long drive in which the two blade members are opened to the front tip of the cutter pin and have a substantially uniform width as a whole, and the rear surface in the cutting and turning direction forms a blade portion. A hand-held cutting machine having a groove for receiving on the axis. 2. The hand-held cutting machine according to claim 1, wherein return spring means for rotating the two blade members from a cutting end position to a position where the groove portions overlap each other,
And a hand-held cutting machine comprising positioning means for stopping the groove portions at a position where they overlap each other. 3. The hand-held cutting machine according to claim 1, wherein an opening stop member for turning the two blade members in a state where the other blade members are overlapped with each other is provided at a tip end portion of the two blade members. Positioning means comprising a stopper provided on the opening preventing member and the two blade members and contacting an opening preventing member provided on the other blade member at a position where the two groove portions overlap each other; A hand-held cutting machine, comprising: return spring means for rotating one blade member material from a cutting end position to a position where the groove portions overlap each other. 4. A hand-held cutting machine according to claim 3, wherein the return spring means is a torsion coil spring which is arranged so as to surround the cutter pin and whose both ends are locked by the stay and the blade member. 5. The handheld device according to claim 1, wherein the two blade members and the links have the same size and shape and are symmetrically arranged about the axis. Cutting machine. 6. The hand-held type according to claim 3, wherein each of the two blade members, the link, the stop member and the stopper have the same size and shape, and are symmetrically arranged about the axis. Cutting machine. 7. The handheld cutting machine according to claim 1, wherein the driving mechanism is a fluid pressure cylinder, and the link holder is coupled to a piston rod of the fluid pressure cylinder.