JP2005138220A - Mounting structure for dust case in cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a dust case in a cutting tool, which facilitates detachment/attachment of the dust case for collecting cut powder compared with a conventional bolting structure in a cutting machine such as a portable circular sawing machine. <P>SOLUTION: The mounting structure for a dust case in a cutting tool has the following constitution. The mounting of the front part of the dust case 50 to a cutting machine body 10 is executed by hooking a hooking part to a hooking receiving part. The mounting of the rear part of the dust case 50 is executed by the engagement of the tip part of a locking bar 30 by pushing and turning it. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dust case mounting structure for cutting dust collection provided in a cutting tool such as a chip saw cutter.

2. Description of the Related Art Conventionally, for example, a cutting tool such as a tip saw cutter has been provided with an integrated dust case for collecting cutting powder (cut powder) generated by cutting. This dust case is a cassette type that can be attached to and detached from the cutting machine main body, and can be easily cleaned by discarding the cut dust collected from the cutting machine main body.
JP-A-6-190628

However, since the conventional dust case is configured to be screwed to the cutting machine main body at, for example, two places, it is necessary to perform tightening and loosening operations of each thumbscrew (wing screw) when attaching and detaching. However, there has been a problem that attaching and removing the dust case itself is troublesome.
An object of the present invention is to provide an easy-to-use dust case mounting structure that can be attached and detached more easily than in the past.

For this reason, this invention was set as the attachment structure of the structure described in the claim of a claim.
According to the attachment structure of the first aspect, the cutting unit is hooked on the hook receiving unit, and the lock bar is pushed and operated to engage the bent portion of the tip with the engaged portion. Since the dust case is attached to the main body, the dust case can be attached to and detached from the main body of the cutting machine easily and quickly as compared with conventional screwing.
According to the mounting structure of the second aspect, since the engagement state of the lock bar with the dust case is held by the biasing force, the dust case can be mounted in a stronger and more reliable state.

Next, the best embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cutting machine 1 to which a dust case 50 is attached by the attachment structure of the present embodiment. The cutting machine 1 is a so-called portable circular saw machine, and includes a cutting machine body 10 having a circular cutting blade (saw blade) 11 and a base 20 placed on a cutting material (not shown). Yes.
The dust case 50 is attached to the side of the cutting machine body 10. FIG. 3 shows the cutting machine body 10 with the dust case 50 removed. The cutting machine body 10 includes a blade case 13 that rotatably supports the cutting blade 11 in a state of covering a cutting edge in a range of approximately half the upper side of the cutting blade 11, and an electric motor 14 attached to the back side of the blade case 13. A main handle 15 provided at the rear of the blade case 13 (the rear side in the cutting progress direction, the left side in FIG. 3), and the side provided at the front part (the front side in the cutting progress direction, the right side in FIG. 3) of the blade case 13 A handle 16 is provided. The cutting blade 11 rotates using the electric motor 14 as a drive source. Further, the blade case 13 is provided with a cutting blade cover 17 that covers substantially the lower half of the lower side of the cutting blade 11 so as to be openable and closable (movable in an arc) along the range of the half circumference.
The base 20 is rotatably supported on the front end portion of the blade case 13 via a support shaft 21. The cutting blade 11 protrudes to the lower surface side of the base 20 through an insertion groove 20 a provided in the base 20. By changing the rotation position of the base 20 with respect to the cutting machine main plate 10 around the support shaft 21, the protruding dimension of the cutting blade 11 to the lower surface side of the base 20 can be changed. The cutting depth with respect to 11 cutting materials can be changed.
The cutting blade 11 rotates in the counterclockwise direction as indicated by a white arrow in FIG. For this reason, the cutting powder generated by the cutting is wound upward from the cutting site (the front end portion of the cutting blade 11). A cylindrical duct portion 13c is formed on the inner peripheral side of the blade case 13 and above the cutting site. The wound cutting powder rides on the air flow generated by the rotation of the cutting blade 11 and flows into the duct portion 13c. The duct portion 13 c is opened near the upper end portion of the blade case 13. The cutting powder that has flowed into the duct portion 13c flows into the dust case 50 through the upper opening of the duct portion 13c. The upper opening is provided with a vertical edge 13f having a fitting recess 13e and a horizontal edge 13g extending horizontally from the lower portion of the vertical edge 13f to the rear side.

As shown in FIG. 3, a wall portion 13 h is formed on the side surface of the blade case 13 along substantially the upper half circumference of the cutting blade 11. The inner side of the wall portion 13h is an attachment recess 13d for fitting the dust case 50 therein. In the mounting recess 13d, almost the entire dust case 50 is fitted to a certain depth. In FIG. 4, the dust case 50 removed from the cutting machine body 10 is shown alone. The dust case 50 in the present embodiment forms a thin box (case) that is attached along the side surface of the blade case 13, and the side surface that is fitted into the attachment recess 13d (visible on the front side in FIG. 4). The dust collecting port 50a is provided on the upper portion of the surface.
A partition edge 50b is provided in the dust collection port 50a. When the dust case 13 is attached to the attachment recess 13d, the partition edge 50b is fitted into the fitting recess 13e, thereby forming a continuous partition wall by the partition edge 50b and the vertical edge 13f. The partition wall (partition edge 50b and vertical edge 13f) and the lateral edge 13g define a part of the dust collection port 50a, so that the cut powder once collected does not flow back into the duct portion 13c. .
A hook 50c is provided at the front of the dust case 50. Corresponding to the hook portion 50c, a hook receiving portion 13b is provided at the front portion in the mounting recess 13d. By attaching the hook 50c to the hook receiving portion 13b, the front side of the dust case 50 is attached so as not to be detached from the mounting recess 13d.
Further, an opening 50 d for allowing the lock bar 30 to pass therethrough is provided at the rear part of the dust case 50. A guide edge 50e and a stopper edge 50f are provided at the edge of the opening 50d on the inner surface side of the bottom plate 50h of the dust case 50. Hereinafter, the portion of the bottom plate portion 50h of the dust case 50 where the guide edge portion 50e and the stopper edge portion 50f are provided is referred to as an engaged portion 50g.

The lock bar 30 is provided on the cutting machine body 10 side. Details of the lock bar 30 are shown in FIG. The tip of the lock bar 30 is bent in an L shape. The lock bar 30 can rotate about its axis (around the axis excluding the tip bent portion 30a, the same applies hereinafter) and in the axial direction (the tip bent portion 30a is positioned with the tip bent portion 30a protruding toward the mounting recess 13d. It is supported so as to be movable within a certain range in the axial direction of the removed portion (the same applies hereinafter).
The lock bar 30 is urged by a compression spring 31 in a direction (arrow B direction in FIG. 6, hereinafter referred to as “pulling direction”) in which the bent end portion 30a of the lock bar 30 protrudes toward the mounting recess 13d. For this reason, the lock bar 30 has a direction in which the protruding portion 30a is protruded toward the mounting recess 13d against the biasing force of the compression spring 31 (arrow A direction in FIG. 6, hereinafter referred to as “pushing direction”). ).
The rear end side of the lock bar 30 protrudes to the back side of the blade case 13. A knob 32 is attached to the protruding portion. The user holds the knob 32, moves the lock bar 30 in the axial direction (pushing direction or pulling direction), and rotates it around the axis, thereby turning the tip bent portion 30a to the engaged portion 50g of the dust case 50. It is possible to engage and disengage, and thus the mounting recess 13d and thus the dust case 50 can be locked and unlocked with respect to the cutting machine body 10.
That is, after the bent end 30a of the lock bar 30 is inserted into the opening 50d of the dust case 50, the knob 32 is picked to move the lock bar 30 in the pushing direction, and further rotated about 90 ° about the axis. When returning to the rear drawing direction, the leading end bent portion 30a is fitted between the guide edge portion 50e and the stopper edge portion 50f and engaged with the engaged portion 50g. This engaged state is held by the compression spring 31. That is, in the state in which the distal end bending portion 30a is fitted between the guide edge portion 50e and the stopper edge portion 50f, the movement of the lock bar 30 in the pulling direction (arrow B direction) and the rotation around the axis are restricted. The rear portion of the dust case 50 is locked in a state where it is attached to the attachment recess 13d and thus to the cutting machine body 10.
Conversely, in this locked state, once the lock bar 30 is moved in the push-in direction (arrow A direction), the lock bar 30 can be rotated about its axis, and the tip bent portion can be rotated by rotating about the 90 ° axis. The engaged state with respect to the engaged portion 50g of 30a can be released. When the engaged state of the distal bent portion 30 with respect to the engaged portion 50g is released, the attachment state of the dust case 30 mainly by the lock bar 30 is unlocked.
In this way, by pulling the knob 32 and pushing the lock bar 30 around, the bent end 30a of the lock bar 30 is engaged with and disengaged from the dust case 50, and the dust case 50 is cut. The attachment state with respect to the main body 10 can be locked / unlocked.

  According to the mounting structure of the dust case 50 configured as described above, the dust case 50c is hooked on the hook receiving portion 13b provided on the cutting machine body 10 side while the hook portion 50c provided at the tip of the dust case 50 is hooked. 50, the front side of the dust case 50 is fitted into the mounting recess 13d, and then the lock bar 30 is pushed and engaged so that the bent end portion 30a of the dust case 50 is engaged with the engaged portion 50g of the dust case 50. It is fixed to the cutting machine body 10. Therefore, the dust case 50 can be attached and detached more easily and quickly than the conventional configuration in which a plurality of locations of the dust case are screwed with thumb screws.

Various modifications can be made to the embodiment described above. For example, the configuration in which the hook portion 50c is provided on the dust case 50 side and the hook receiving portion 13b is provided on the cutting machine main body 10 side is illustrated, but conversely, the hooking portion is provided on the cutting machine main body side and the hook receiving portion is provided. May be provided on the dust case side, in other words, one of the hook part and the hook receiving part that are engaged with each other in the dust case removal direction is provided on the dust case side, and the other is provided on the cutting machine main body side. do it.
Moreover, although the structure which provides the lock bar 30 in the cutting machine main body 10 side was illustrated, it is good also as a structure provided in the dust case side.
Further, although the configuration in which the distal end side of the lock bar 30 is bent in an L shape and the distal end bending portion 30a is provided is illustrated, the distal end bent portion may be bent in a T shape.
Moreover, although the structure which fixes the front part side of a dust case by the engagement state by a hook part and a hook receiving part, and fixes the rear part side with a lock bar was illustrated, you may comprise reversely. That is, it is good also as a structure which fixes the front side of a dust case with a lock bar, and fixes the rear part side by engagement with a hook part and a hook receiving part.
Furthermore, the configuration in which the hook-type fixing portion by the hook portion 50c and the hook receiving portion 13b and the push-type fixing portion by the lock bar 30 are provided one by one is illustrated. It is good also as a structure provided in multiple places.

It is a figure which shows illustrated embodiment, and is the whole perspective view which looked at the portable Marnoco board from the front diagonally backward. This figure shows a state in which the rear side of the dust case is broken and the bent end portion of the lock bar is engaged with the engagement edge. It is the whole perspective view which similarly looked at the portable Marnoko board from the back side slanting back. It is the perspective view which looked at the portable Marunoko board of the state where the dust case was removed from the front diagonally back. It is the perspective view which looked at the dust case simple substance from the back side. It is a cross-sectional view of the front mounting portion of the dust case. It is a cross-sectional view of the rear part attachment part of a dust case.

Explanation of symbols

1 ... Cutting machine (portable marnoco board)
DESCRIPTION OF SYMBOLS 10 ... Cutting machine main body 11 ... Cutting blade 13 ... Blade case 13b ... Hook receiving part, 13c ... Duct part, 13d ... Mounting recessed part 13e ... Insertion recessed part, 13f ... Vertical edge, 13g ... Horizontal edge 14 ... Electric motor 15 ... Main Handle 16 ... Side handle 17 ... Cutting blade cover 20 ... Base 30 ... Lock bar, 30a ... Bend 31 ... Compression spring 32 ... Knob 50 ... Dust case 50a ... Dust collection port, 50b ... Partition edge, 50c ... Hook , 50d ... opening 50e ... guide edge, 50f ... stopper edge, 50g ... engaged part, 50h ... bottom plate part

Claims (2)

A structure for attaching the dust case to the cutting machine main body in a cutting machine provided with a cutting blade and a dust case attached to the cutting machine main body for collecting cutting powder generated by cutting processing Because
A hooking part is provided on one of the cutting machine body or the dust case, and a hook receiving part on which the hooking part is hooked is provided on the other, and the lock bar can be moved in the axial direction on the one and rotated about the axis. Provided possible, provided the engaged portion to which the tip engagement portion of the lock bar is engaged on the other,
The hook portion is hooked on the hook receiving portion, and the tip engaging portion is engaged with the engaged portion by pushing and rotating the lock bar, and the other is attached to the one. Dust case mounting structure.   The attachment structure according to claim 1, wherein the lock bar is biased in a direction in which the tip engagement portion is engaged with the engaged portion.

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