JP3078576U - Hand cutter for metal bar and its support cover - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to easily secure higher workability and safety without complicating the configuration. A slide rod (slider) slidable with respect to a base, a guide piece provided at a tip of the slide rod, and a return spring for biasing the guide piece in a direction away from the base. The guide body 34 having the combination of the above is disposed on the lower surface of the support cover 18 so as to ensure the movement of the guide piece in the radial direction of the disk-shaped rotary blade 14 along the introduction concave portion 26.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention covers a metal rod hand cutter and a disk-shaped rotary blade that can cut metal bars such as rebars and metal pipes under the rotational drive of a disk-shaped rotary blade. The present invention relates to a support cover for closing and opening a lower opening end of a protective cover.

[0002]

[Prior art]

 A portable so-called hand cutter with a disk-shaped rotary blade driven by a motor is used to cut a metal bar such as a reinforcing bar or a metal pipe, and stands up from a floor surface or a wall surface. It is also provided as a tool for cutting and removing metal rods that have been extended or are almost flush with their surfaces.

[0003] As a so-called flush-cutting hand cutter, for example, a disk-shaped rotary blade disposed at a tip end position of a main body also serving as a grip portion is disposed with its lower surface along a floor surface or the like. A form disclosed in, for example, Japanese Utility Model Registration No. 3066069 which can be supported is known.

[0004] In the hand cutter of this embodiment, the disk-shaped rotary blade is usually covered with a protective cover. The main body, which partially exposes the disk-shaped rotary blade and ensures the introduction of the bar to be cut from the blade edge of the disk-shaped rotary blade toward the center, that is, the introduction of a metal bar, also serves as a gripping portion. The protective cover is formed so as to extend from the side wall to the upper wall in a cutout shape extending along the axis of the cover.

That is, in this type of hand cutter, the direction of the tip of the main body is the working direction of the hand cutter, that is, the cutting direction of the bar to be cut. Then, the hand-cutter is pushed out along the axis of the main body in the distal direction, and the disk-shaped rotary blade is pressed against the bar-to-be-cut so as to be advanced.

[0006]

[Problems to be solved by the invention]

 By the way, the hand cutter of the form disclosed in the aforementioned Utility Model Registration No. 3066069 merely cuts a bar material to be cut up from a floor surface or the like, flush with the floor surface. For example, it is often used, for example, when cutting a bar to be cut away from the floor surface.

In the case where the hand cutter is used at a position distant from the floor surface, that is, in a state where the hand cutter is floated from the floor surface or the like, unlike the case where the hand cutter is used along the floor surface or the like, the hand cutter does However, since it is not easy to regulate the movement of the hand cutter, there is a possibility that the disk-shaped rotary blade may accidentally suddenly come into contact with and hit the bar to be cut while holding the hand cutter. Such abrupt contact of the disk-shaped rotary blade with the bar to be cut or the like easily causes breakage or damage of the disk-shaped rotary blade, in particular, the blade edge, so that a reduction in safety is inevitable.

[0008] Further, it is an ideal cutting posture of a hand cutter of this type that a disk-shaped rotary blade is addressed to a bar to be cut at a right angle and the cutting is further advanced in the right angle state. If the cutting progress in the right angle state is reliably obtained, the breakage and damage of the blade of the disk-shaped rotary blade can be sufficiently prevented, and the life of the entire disk-shaped rotary blade can be maintained longer. According to this, it is possible.

However, in the conventional hand cutter, since the contact of the disk-shaped rotary blade with the bar to be cut and the entry angle are not regulated at all, the right-angle contact of the disk-shaped rotary blade with the bar to be cut is not performed. It is not easy to move at right angles and at right angles, and the accuracy tends to depend on the attention of the worker or the work technique. Therefore, in cutting work with the hand cutter floating above the floor or the like, the easiness of the work tends to be reduced, and the workability itself is unavoidable.

An object of the present invention is to provide a hand cutter for a metal bar and a support cover therefor, which can easily ensure higher workability and safety without complicating the configuration.

[0011]

[Means for Solving the Problems]

 In order to achieve this object, according to the hand cutter for a metal bar of the present invention, the lower surface opening of the protective cover is provided by the support cover having the substantially concave notch-shaped introduction recess similarly to the protective cover. A combination of a slider whose end is closed and covered and slidable with respect to the base, a guide piece provided at the tip of the slider, and a return spring capable of biasing the guide piece in a direction away from the base. The guide body having the guide member is disposed on the lower surface of the support cover so as to prevent the movement of the guide piece in the radial direction of the disk-shaped rotary blade along the introduction recess.

Then, the guide piece of the guide body is addressed to the bar to be cut, and the hand cutter is pushed in under a pressing force against the biasing force of the return spring, so that the bar to be cut is inserted into the introduction recess. In order to guarantee the introduction, the hand cutter for metal bars of this invention is constructed.

The support cover of the metal bar hand cutter of the present invention includes a slider that can slide on the base, a guide piece provided at the tip of the slider, and a separating direction from the base. A guide body having a combination with a return spring capable of displacing the guide piece at the bottom is provided on the lower surface of the disk-shaped rotary blade so that the guide piece can be moved in the radial direction along the introduction recess. are doing.

[0014]

[Embodiment of the invention]

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

As shown in FIGS. 1 and 2, a hand cutter 10 for a metal bar according to the present invention includes a main body 12 having a built-in motor, a disk-shaped rotary blade 14 driven to rotate by the motor, An upper surface 14a of the disk-shaped rotary blade and a protective cover 16 with an open lower surface that covers the peripheral edge 14b are provided, and the disk-shaped rotary blade is closed and covered by a support cover 18 to close the lower surface open end of the protective cover. The lower surface 14c of the blade is covered.

In the hand cutter 10 of this type, the main body 12 is formed into a shape that can also serve as a gripping part, that is, a shape that is easy to grip, for example, a substantially cylindrical shape, and decelerates the driving force of a motor (not shown). A so-called speed reduction mechanism (not shown) for transmitting and outputting is provided in the distal end portion 12a of the main body.

The protective cover 16 is provided integrally with a housing 20 which is disposed and fixed at the distal end position of the main body 12. As shown in FIG. 2, inside the housing 20, a direction changing mechanism (not shown) for transmitting and converting the output of the speed reduction mechanism to the rotation of the drive shaft 22 protruded inside the protective cover 16 is provided. ) Is provided, and a disc-shaped rotary blade 14 is connected and fixed to the drive shaft.

Here, as can be seen from FIGS. 1 and 2, in the hand cutter 10, a bar to be cut, that is, a reinforcing bar, a metal, is formed in a radial direction from a peripheral edge 14 b of the disk-shaped rotary blade. An introduction recess 26 that allows the introduction of a metal rod 24 such as a pipe made of metal is provided with a flat notch shape extending from the side wall of the protective cover to the upper wall, for example, a plane extending in the radial direction of the disk-shaped rotary blade 14. As a substantially U-shaped notch, a part of the disk-shaped rotary blade 14 is defined and formed on the protective cover 16 so as to be exposed. The introduction concave portion 26 is also formed as a cutout having the same shape in a plane on the support cover 18 for closing and covering the lower surface opening end of the protective cover 16.

Reference numeral 28 in FIG. 2 denotes a substantially U-shaped cover body that covers the outer periphery of the introduction concave portion 26, and by providing this cover body, intrusion of cut pieces and the like into the protective cover 16. Has been prevented.

Reference numeral 30 in FIG. 1 denotes an auxiliary grip for an operator to grip together with the main body 12, and this auxiliary grip is adapted to screw a corresponding screw end into a mounting hole 32 shown in FIG. For example, it is fixedly provided in a form extending laterally from the housing 20.

Such a hand cutter 10 is supported by gripping the main body 12 and the auxiliary grip 30 together. Then, as shown by arrows in FIGS. 1 and 2, the hand cutter 10 itself is advanced with respect to the bar to be cut (metal bar) 24, and the bar to be cut is introduced into the introduction concave portion 26. This makes it possible to cut the metal bar by the disk-shaped rotary blade 14.

Here, as shown in FIG. 1 and FIG. 2, in the hand cutter 10 of the present invention, a guide body 34 that serves as a progress guide of the hand cutter 10 with respect to the bar 24 to be cut is provided on the lower surface of the support cover 18. It is arranged.

The guide body 34 includes a slider 38 that can slide with respect to a base 36, a guide piece 40 provided at the tip of the slider, and a return spring 42 that can bias the guide piece in a direction away from the base. Are formed.

As can be seen from FIG. 1, in this embodiment, the guide piece 40 has an engagement end 40 a with which the bar 24 to be cut can be engaged at one side end (up and down in the figure). The guide piece is integrally fixed to, for example, the tip of a pair of left and right slide rods which are formed into a substantially L-shape to be integrated and serve as a slider 38, for example, a pair of left and right slide rods. A pair of left and right slide rods (sliders) 38 extending rearward from the guide piece 40 are inserted and arranged in the base 36 through the insertion holes 36a so as to be freely slidable in the axial direction. A spring 42 is provided so as to apply a biasing force in a direction in which the guide piece 40 is separated from the base.

As the return spring 42, for example, a compression coil spring can be used. The compression coil spring is wound around the slide rod 38 between the guide piece 40 and the base 36.

The guide piece 40 is fixedly attached to the tip of the slide rod 38 by screwing a set screw 43 or the like. A stopper 44 is attached to the rear end of the slide rod 38 with a set screw 45 or the like, so that the slide rod is prevented from being detached from the base 36.

For example, the guide body 34 is pre-assembled on the basis of the base 36 so that the movement of the guide piece 40 in the radial direction of the disk-shaped rotary blade 14 along the introduction recess 26 can be ensured. For example, it is arranged and fixed on the lower surface of the support cover 18 under the fixation by a plurality of fixing pins 46 and the like.

The guide piece 40 of the guide body is provided outside the opening of the introduction recess 26 and aligned with the introduction recess. That is, when the bar 24 to be cut is cut by the hand cutter 10 having such a guide body 34, as shown in FIGS. 1 and 2, the hand cutter itself advances with respect to the bar to be cut. First, the guide piece 40 is brought into contact with the bar to be cut. Then, the hand cutter 10 is pushed into the bar 24 to be cut under a pressing force against the biasing force of the return spring (compression coil spring) 42, and the bar to be cut is introduced into the recess 26 under the pushing. By this, cutting of the bar to be cut by the disk-shaped rotary blade 14 becomes possible.

When the hand cutter 10 is pushed into the bar 24 to be cut, the guide piece 40 is moved under the sliding of the slide rod 38 against the base 36 against the biasing force of the return spring 42. 1. It moves (retreats) to the right in the figure as indicated by the arrow in FIG. In other words, the retraction of the guide piece 40 guarantees the introduction of the bar to be cut 24 into the introduction concave portion 26 and the cutting of the bar to be cut by the disk-shaped rotary blade 14.

As described above, in the hand cutter 10 of the present invention, since the guide piece 40 of the guide body is located outside the opening of the introduction recess 26, the disc-shaped rotary blade 14 exposed in the introduction recess is formed. Functions as a protective body. Therefore, unexpected and sudden contact or collision of the disk-shaped rotary blade 14 with the bar 24 to be cut during the cutting operation can be sufficiently and reliably prevented by the guide piece 40.

When the bar 24 to be cut is introduced into the recess 26, it is necessary to push the hand cutter 10 against the biasing force of the return spring 42. That is, abrupt contact of the concave material to be cut with the disk-shaped rotary blade 14 is reliably prevented.

As described above, according to the present invention, abrupt contact of the disk-shaped rotary blade 14 with the bar 24 to be cut can be prevented, and thus the blade edge of the disk-shaped rotary blade caused by the sharp contact and the like can be prevented. Prevention of breakage, damage, etc. of 14b certainly improves its safety.

Since it is sufficient to push the hand cutter 10 in the same manner as in the related art against the biasing force of the return spring 42, the workability is not reduced.

Further, a guide piece 40 is provided at the tip of a slide rod 38 slidable with respect to the base 36, and it is sufficient to apply a biasing force of a return spring 42 to this slide rod, which complicates the configuration. Is not accompanied.

In addition, since the engagement end 40 a engageable with the bar to be cut 24 is provided at one end of the guide piece 40, the positioning of the introduction concave portion 26 and the hand cutter 10 with respect to the bar to be cut is easy. And the stability of the position of the hand cutter with respect to the bar to be cut at the time of cutting is also improved. Therefore, according to the hand cutter 10, the workability and the reliability of the work can be easily improved.

Here, it is preferable to form the guide piece 40 of the guide body so as to extend in the vertical direction thereof, that is, in the axial direction of the bar 24 to be cut. As described above, if the guide piece 40 has a vertically long shape extending in the axial direction of the cut bar 24, the guide piece comes into surface contact with the peripheral surface of the cut bar 24 over a wide range along the axis. Since the guide pieces are in line contact with each other, the guide pieces can also function as right angle guides for defining the right angle of the disc-shaped rotary blade 14 with respect to the bar to be cut.

At the time of the cutting, if the disk-shaped rotary blade 14 is advanced at right angles to the bar 24 to be cut, it becomes easy to cut the bar to be cut substantially horizontally. Such advancement of the disk-shaped rotary blade 14 at right angles to the bar 24 to be cut also leads to prevention of breakage, damage, and the like of the cutting edge of the disk-shaped rotary blade. In this case, the life of the disk-shaped rotary blade can be sufficiently maintained, so that the safety of the disk-shaped rotary blade is further improved.

Further, the disk-shaped rotary blade 14 can be easily advanced at right angles to the bar 24 to be cut without depending on the attention of the operator and the working technique, so that the workability and the workability are further improved. Be improved.

Incidentally, it is desirable that the support cover 18 provided with the guide body 34 be detachable from the protective cover 16. For example, the support cover 18 is attached by a set screw 48 inserted through an insertion hole (not shown) of the protective cover 16.

As described above, if the support cover 18 is made detachable, the usage of the hand cutter 10 can be appropriately selected. In other words, when the hand cutter 10 is used along the floor or the like, if the support cover 18 is removed, the cutting of the bar 24 to be cut can be ensured in the same manner as in the past, so that the hand cutter 10 can be used. There is no loss of functionality.

If the support cover 18 provided with the guide body 34 is formed as a single piece, the guide body can be attached to the hand cutter only by attaching the support cover without any operation to the conventional hand cutter 10. Can be arranged. That is, attachment to the existing hand cutter 10 can be easily performed.

Here, in the embodiment of the present invention, a compression coil spring is illustrated as the return spring 42, but it is sufficient if the guide piece 40 can be biased in a direction away from the base 36, so The invention is not limited thereto, and another spring member, for example, a tension coil spring, a bamboo spring, or the like may be used.

In this embodiment, the return spring 42 composed of a compression coil spring is wound around the slide rod 38 between the guide piece 40 and the base 36, but is guided in the direction away from the base 36. It is sufficient to apply a biasing force for biasing the piece to the slide rod, and eventually to the guide piece, and the present invention is not limited to this. For example, a return spring may be provided inside a hollow base.

In this embodiment, the pair of right and left slide rods 38 is embodied as a slider. However, the slider is slidable with respect to the base 36 and the guide piece 40 is positioned with respect to the base. Since it is sufficient if the rotation is impossible, the number of the slide rods is not limited to this as long as it is plural. In addition, by providing a rotation restricting means including a combination of a guide groove extending in the axial direction of the slide rod 38 and an engagement protrusion capable of slidingly contacting the guide groove, a single slide rod can be used as a pair of right and left slide rods. It can also be used as a slider similar to a slide rod.

Further, the present invention is not limited to the slide rod. For example, by disposing a square rod having a substantially square cross section in the same manner as the slide rod 38, it can be used as a slider.

Further, a plate-like member can also be used as a slider. When the plate-like member is used as a slider, a pair of left and right holding members formed in a substantially U-shape or the like can be used as the base 36 slidably supported.

Further, in the embodiment of the present invention, the guide piece 40 has a substantially L-shape in plan view, but the guide piece 40 is not limited to this as long as it has a shape capable of contacting the bar 24 to be cut. The guide piece may be formed in various other shapes. However, if the guide piece 40 has a substantially L-shape in plan view as in this embodiment, the engagement end 40a of one side end protrudingly provided on the guide piece will be the introduction recess 26 for the bar to be cut, and furthermore, In addition to functioning as positioning of the hand cutter 10, stabilization of the position of the hand cutter with respect to the bar to be cut at the time of cutting can also be ensured at the same time. Therefore, improvement of the workability and the reliability of the work can be easily ensured by forming the guide piece 40 into a substantially L-shaped plane.

The above-described embodiment is for explaining the present invention, and does not limit the present invention in any way, and all modifications and alterations within the technical scope of the present invention are included. It goes without saying that this invention is included in the invention.

[0049]

[Effect of the invention]

 As described above, according to the present invention, according to the hand cutter for a metal bar, since the guide piece of the guide body functions as a protective body for the disc-shaped rotary blade exposed in the introduction recess, the cutting work is performed during the cutting operation. The guide piece can sufficiently and surely prevent sudden and sudden contact or collision of the disc-shaped rotary blade with the bar to be cut, and when introducing the bar to be cut into the introduction recess. In addition, since it is required to push the hand cutter against the biasing force of the return spring, sudden contact of the concave material to be cut with the disk-shaped rotary blade is surely prevented from this point as well.

[0050] Therefore, breakage, damage, and the like of the cutting edge of the disk-shaped rotary blade due to abrupt contact and the like are prevented, and thereby its safety is reliably improved.

Then, a guide piece is provided at the tip of the slider slidable with respect to the base, and it is sufficient to apply a biasing force of the return spring to the slider, which may complicate the configuration. Absent.

Further, if the guide piece of the guide body is formed in a vertically long shape extending in the axial direction of the bar to be cut, the guide piece forms a right angle defining the right angle of the disk-shaped rotary blade with respect to the bar to be cut. It can also function as a guide. If the disk-shaped rotary blade is advanced at right angles to the bar to be cut, breakage or damage of the blade edge of the disk-shaped rotary blade can be prevented, and the life of the entire disk-shaped rotary blade can be maintained longer. According to this, since it is sufficiently possible, the safety of the disk-shaped rotary blade is further improved.

Further, since the disk-shaped rotary blade can be easily moved at right angles to the bar to be cut without depending on the attention of the operator and the work technique, the workability and the workability are further improved. Be improved.

In addition, since the engagement end engageable with the bar to be cut is provided at one end of the guide piece, the positioning of the introduction concave portion with respect to the bar to be cut, and furthermore, the hand cutter can be easily performed. At the time of cutting, the stability of the position of the hand cutter with respect to the bar to be cut is also improved. Therefore, the workability and the reliability of the work can be easily improved by the hand cutter.

According to the support cover of the hand cutter for a metal bar of the present invention, the guide body is arranged on the hand cutter only by attaching the support cover without any operation on the conventional hand cutter. Can be set up. In other words, it can be easily installed on existing hand cutters.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic plan view of a metal bar hand cutter and its support cover according to the present invention, as viewed from a lower surface side.

FIG. 2 is a partially cutaway schematic side view of a metal bar hand cutter and its support cover.

[Description of Signs] 10 Hand cutter for metal bar 16 Protective cover 18 Support cover 26 Introducing recess 34 Guide body 36 Base 38 Slider (slide rod) 40 Guide piece 42 Return spring

Claims (6)

[Utility model registration claims] 1. A main body having a built-in motor; a disk-shaped rotary blade rotatably driven by the motor; a protective cover for covering at least an upper surface and a peripheral edge of the disk-shaped rotary blade; A substantially concave notch-shaped introduction recess formed and defined from the side wall of the protective cover to the upper wall so that the rod to be cut can be introduced in the radial direction from the cutting edge of the blade. In the hand cutter, a support cover having a substantially concave notch-shaped introduction concave portion like the protective cover closes and covers the lower opening end of the protective cover, and a slider slidable with respect to the base; A guide body having a combination of: a guide piece provided at the tip of the slider; and a return spring capable of biasing the guide piece in a direction away from the base, is provided with a disk-shaped rotary blade along the introduction recess. The guide piece of the guide body is disposed on the lower surface of the support cover so as to ensure the movement of the guide piece in the radial direction. The guide piece of the guide body is applied to the bar to be cut, and is subjected to a pressing force against the biasing force of the return spring. A hand cutter for a metal bar, wherein the hand cutter is pushed in to ensure the introduction of the bar to be cut into the introduction recess. 2. A main body having a built-in motor; a disk-shaped rotary blade rotatably driven by the motor; a protective cover for covering at least an upper surface and a peripheral edge of the disk-shaped rotary blade; A substantially concave notch-shaped introduction recess formed and defined from the side wall of the protective cover to the upper wall so that the rod to be cut can be introduced in the radial direction from the cutting edge of the blade. In a hand cutter, a support cover having a substantially concave notch-shaped introduction concave portion like a protective cover closes and covers the lower surface open end of the protective cover, and a slider slidable with respect to a base; It has a combination of a guide piece which is formed in a vertically elongated shape extending in the axial direction of the cutting bar and is provided at the tip of the slider; and a return spring which can bias the guide piece in a direction away from the base. A guide body is disposed on the lower surface of the support cover so as to ensure the movement of the guide piece in the radial direction of the disk-shaped rotary blade along the introduction recess. The metal bar is characterized in that it is possible to guarantee the introduction of the bar to be cut into the introduction recess by pushing the hand cutter under the pressing force against the biasing force of the return spring. Hand cutter. 3. A main body having a built-in motor; a disk-shaped rotary blade rotatably driven by the motor; a protective cover for covering at least an upper surface and a peripheral edge of the disk-shaped rotary blade; A substantially concave notch-shaped introduction recess formed and defined from the side wall of the protective cover to the upper wall so that the rod to be cut can be introduced in the radial direction from the cutting edge of the blade. In the hand cutter, a support cover having a substantially concave notch-shaped introduction concave portion like the protective cover closes and covers the lower opening end of the protective cover, and a slider slidable with respect to the base; A combination of a guide piece provided at one end of the slider and having an engagement end engageable with the bar to be cut and a return spring capable of biasing the guide piece in a direction away from the base. Have A guide body is provided on the lower surface of the support cover so as to ensure the movement of the guide piece in the radial direction of the disk-shaped rotary blade along the introduction recess, and the guide piece of the guide body is used as a bar to be cut. A hand for a metal bar, characterized in that the hand cutter is pushed in under a pressing force against the biasing force of the return spring, thereby ensuring the introduction of the bar to be cut into the introducing recess. cutter. 4. An upper surface of a disk-shaped rotary blade and a lower surface opening end of a protective cover for covering a peripheral edge are closed and formed so as to have a substantially cutout-shaped introduction recess like a protective cover. A support cover for a hand cutter for a metal bar, comprising: a slider slidable with respect to a base; a guide piece provided at the tip of the slider; and a biasable guide piece in a direction away from the base. A metal rod having a guide body having a combination of a return spring and a lower surface thereof so as to ensure the movement of the guide piece in the radial direction of the disk-shaped rotary blade along the introduction recess. Support cover for hand cutter. 5. An upper surface of a disk-shaped rotary blade and a lower surface opening end of a protective cover for covering a peripheral edge are closed and formed so as to have a substantially cutout-shaped introduction recess like a protective cover. And a slider slidable with respect to the base; formed in a vertically elongated shape extending in the axial direction of the bar to be cut, and provided at the tip of the slider. A guide body having a combination of a guide piece and a return spring capable of biasing the guide piece in a direction away from the base is provided on the lower surface thereof so as to ensure the movement of the guide piece along the introduction recess. Support cover for hand cutters for metal bars. 6. An upper surface of a disk-shaped rotary blade and a lower surface opening end of a protective cover for covering a peripheral edge are closed and formed so as to have a substantially flat notch-shaped introduction recess like the protective cover. And a slider slidable with respect to a base portion; and an engagement end provided at a tip of the slider and capable of engaging with a bar to be cut, having one end. And a return spring capable of biasing the guide piece in a direction away from the base portion. A lower surface of the guide body, which can guarantee movement of the guide piece along the introduction recess. Support cover for hand cutters for metal bars, which is included in the company.