JP3893571B2 - Drilling blade rotation prevention structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation preventing structure for a drilling blade for preventing a rotating body provided with the drilling blade from rotating when replacing the drilling blade in a punching tool for drilling a plate material such as a wall material.
[0002]
[Prior art]
Conventionally, punching has been performed on a plate material using a punching tool. For example, when opening a wall box or the like attached to the back surface of a wall material to face the wall surface, etc. Then, a punching tool as shown in FIGS. 5 and 6 may be used.
In the figure, the punch 1 is detachably attached to a handy-type rotary drive tool, the rotary shaft 2 is rotationally driven by the rotary drive tool, and one end is detachably fixed to the rotary shaft 2. A center shaft 3 that provides the position of the drilling center of a through-hole to be drilled in a plate material such as a wall material, and the lower portion of the rotary shaft 2 are detachably fitted into the center through-hole, and are predetermined from the center through-hole. And a cutting depth adjusting means for limiting the moving distance of the rotating body 4, and a part to be gripped by hand at the time of drilling. And a main body 8 provided with a cover body 9 for preventing scattering of chips generated when drilling.
[0003]
The rotating body 4 has a blade body bracket 5 fixed thereto via a screw 5 a, and a drilling blade 6 is sandwiched and fixed to the outer wall of the blade body bracket 5 by a head of a fixing screw 7. The piercing blade 6 can be detached from the side of the piercing tool 1 in the center axis direction by loosening the fixing screw 7 using a screwdriver or the like.
[0004]
The cover body 9 is formed integrally with the main body 8, and is detachably attached to a cup-shaped tubular portion 9a that covers the entire rotating body 4 and an opening formed on a side surface of the tubular portion 9a. And a lid member 9b.
[0005]
When replacing the drilling blade 6, the conventional drilling tool 1 configured in this way is fixed to the blade bracket 5 by using a screwdriver or the like from the side of the drilling tool 1. After loosening and removing in the center axis direction, the new drilling blade 6 can be brought into contact with the outer wall of the blade body bracket 5 in the reverse procedure and the fixing screw 7 can be tightened.
[0006]
[Problems to be solved by the invention]
However, in the conventional drilling tool, when the drilling blade 6 is replaced, when the fixing screw 7 is loosened or tightened with a screwdriver or the like, the rotating body 4 easily turns to the left and right, and stable tightening work cannot be performed. . In addition, when starting to loosen the fixing screw 7 or when tightening it tightly at the end, the driver or the like is deviated due to the moment of pressing, and the rotating body 4 is suddenly rotated and the drilling blade 6 moves. There was a risk of cutting the hand with the drilling blade 6 on the opposite side, which was very dangerous. As a result, tightening work had to be careful.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotation preventing structure for a drilling blade that can safely replace and install the drilling blade.
[0008]
[Means for Solving the Problems]
The rotation prevention structure of the drilling blade according to the invention of claim 1 is applied to a wall material or the like by rotating a rotating body provided with a drilling blade with respect to a main body provided with a cover body that prevents scattering of chips. in piercer piercing the hole, the rotation of the rotating body a rotation prevention structure of the cutting head can be prevented with respect to the body, the first engagement provided on a rotating body provided with the hole punch bit and engagement portion, and a second engaging portion provided in the main body, and a piercer having a, during replacement of the hole punch bit is inserted from the opening of the cover body, the first engagement portion of the rotating body and A rotation preventing body that engages with a second diameter portion of the main body and prevents the rotation of the rotating body relative to the main body is provided.
[0010]
According to a second aspect of the present invention, there is provided the punching blade rotation preventing structure according to the second aspect of the present invention, wherein the rotary body provided with the punching blade of the punching tool rotates with respect to the main body to punch a through hole in the wall material or the like. A through-hole provided in the rotating body and penetrating in the direction of the rotation axis, and an insertion portion provided in a cover body provided in the main body of the punching tool so as to correspond to the through-hole of the rotating body. When, during replacement of the cutting head, as well as through the through hole of the rotating body, in Rukoto tip is inserted into the insertion portion of the cover member, the rotating member relative to the body is relatively A detent pin for preventing the rotation is provided.
[0011]
According to a third aspect of the invention, there is provided the rotation preventing structure for the drilling blade, wherein the cover body can be opened sideways, and when the rotation prevention body is attached, the drilling blade of the rotating body is the cover body. It is held at a position facing the side opening.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
In the figure, the punch 1 is detachably attached to a handy-type rotary drive tool, the rotary shaft 2 is rotationally driven by the rotary drive tool, and one end is detachably fixed to the rotary shaft 2. A center shaft 3 that provides the position of the center of the through hole formed in a plate material such as a wall material, and a center through hole 4a that is concentric with the center position of the through hole formed in the plate material are provided below the rotary shaft 2. A rotating body 4 having a pair of perforating blades 6 which are detachably inserted and are opposed to each other with a predetermined distance from the central through hole, and a cutting depth adjusting means for limiting a moving distance of the rotating body 4 And a main body 8 provided with a cover body 9 that serves as a part to be gripped by hand at the time of drilling and prevents scattering of chips generated when the through hole is drilled. Therefore, only the rotating body 4 rotates with respect to the main body 8.
[0013]
The rotating body 4 is fixed in a non-rotating state by pivotally supporting a convex portion formed on the lower outer surface of the rotating shaft 2 in a concave portion notched in the axial direction on the inner surface of the central through hole 4a. Further, in this rotating body 4, fixing portions 4b are formed at positions on both sides spaced apart from the central through hole 4a by a predetermined distance, and a substantially rectangular parallelepiped blade bracket 5 is screwed to the fixing portion 4b. It is attached via. Further, a female screw is threaded on the outer wall of the blade bracket 5, and a plate material is placed between the head of the fixing screw 7 screwed on the female screw and the outer wall of the blade bracket 5. A perforating blade 6 for cutting is sandwiched. The piercing blade 6 can be detached from the side of the piercing tool 1 in the center axis direction by loosening the fixing screw 7 using a screwdriver or the like.
[0014]
Further, a pair of through holes 4c are formed at opposite ends of the rotating body 4, and a pair of insertion holes are inserted into the bottom wall of the cover body 9 integrated with the main body 8 at positions facing the through holes 4c. A portion 9c is provided so that a round bar detent pin 10 can be inserted from the opening of the cover body 9 and can be inserted into the through hole 4c of the rotating body 4 so as to be inserted into the insertion portion 9c of the cover body 9. It has become.
[0015]
On the other hand, the cover body 9 includes a cup-shaped cylindrical portion 9a that covers the entire rotating body 4 and a lid member 9b that is detachably attached to an opening formed on a side surface of the cylindrical portion 9a. Has been.
Further, the center shaft 3 can be retracted to the inner side via the expansion / contraction spring 2a when pressed against the plate material.
[0016]
Next, the exchanging operation of the drilling blade in the drilling tool configured as described above will be described.
In order to replace the drilling blade 6, first, as shown in FIG. 1, the non-rotating pin 10 is inserted into the through hole 4 c of the rotating body 4 of the drilling tool 1, and further inserted into the insertion part 9 c of the cover body 9. To prevent rotation. Next, as shown in FIG. 4, the cover member 9b is removed, the fixing screw 7 is loosened with a screwdriver, and the drilling blade 6 is moved in the axial direction to be removed. Then, a new drilling blade 6 is attached and the fixing screw 7 is tightened with a screwdriver. Next, the rotation prevention pin 10 is once removed, the rotating body 4 is rotated 180 degrees, the rotation prevention pin 10 is inserted again, and the opposite drilling blade 6 is replaced in the same manner. After exchanging the drilling blade 6, the lid member 9 b is attached, the detent pin 10 is removed, and the drilling tool 1 is used.
[0017]
Thus, the rotation prevention structure of the drilling blade of the present embodiment has the through hole 4c as the first engaging portion that penetrates in the rotation axis direction provided in the rotating body 4 provided with the drilling blade 6 of the punching tool 1. The rotation preventing pin 10 as a rotation preventing body is passed through the second end, and the distal end portion of the rotation preventing pin 10 is provided in the main body 8 of the punch 1 in correspondence with the through hole 4c of the rotating body 4. It is inserted in the insertion part 9c as an engaging part.
[0018]
Therefore, when the drilling blade 6 is replaced, while the fixing screw 7 is loosened or tightened with a screwdriver or the like, the rotary body 4 and thus the drilling blade 6 are held at a fixed position. Can be performed stably. In particular, when starting to loosen the fixing screw 7 or finally tightening it tightly, the driver or the like is deviated due to the moment of pressing, and the rotating body 4 suddenly rotates and the drilling blade 6 moves. Thus, it is possible to reliably avoid the danger of cutting the hand with the drilling blade 6 on the opposite side, and the replacement operation can be performed with confidence.
[0019]
Further, the punching tool 1 of the present embodiment is provided with the cover body 9, but the rotating body 4 is fixedly facing the outside from the opening when the fixing screw 7 of the punching blade 6 removes the cover member 9b of the cover body 9. Since it is held in the position, it is easier to work than replacing the drilling blade 6 by putting a hand in the narrow gap of the cylindrical portion 9a from the front opening side facing the wall material of the cover body 9. Can be reliably replaced, and can be operated safely.
[0020]
By the way, although the piercing tool 1 of the said Example has shown the thing provided with the cover body 9, when implementing this invention, it can apply also to the piercing tool which is not provided with the cover body 9. FIG. This case corresponds to the aspect of claim 1. Further, the center shaft 3 comes into contact with the wall material and can be retracted via an internal expansion spring when pressed. However, the center shaft 3 is fixed and can be applied to a punch that does not retract. Can do.
[0021]
And in the said Example, although the rotation prevention pin 10 which is a rotation prevention body is formed with the round bar, it is not restricted to this, For example, a square bar may be sufficient. Furthermore, in the said Example, although the 1st engaging part of Claim is formed by the through-hole 4c of the rotary body 4, and the 2nd engaging part is formed by the insertion part 9c of the cover body 9, this invention is implemented. In order to do so, not only those that engage with the through hole 4c by inserting the anti-rotation pin 10 that is a rod member, but for example, a locking recess or the like that opens laterally in the rotating body 4 and the body 8 is formed, The rotation preventing body may be provided with a locking projection that engages with these locking recesses and the like to prevent rotation. In addition, the main body 8 may be provided with a locking projection that advances and retreats in the vertical direction, and the rotation of the rotating body 4 may be prevented by a sliding operation. Anything can be used as long as it can be held in a fixed position.
[0022]
【The invention's effect】
As described above, the rotation preventing structure for a drilling blade according to the first aspect of the present invention has the first engagement portion provided in the rotating body provided with the drilling blade of the punching tool and the first engaging portion provided in the main body of the punching tool. Engaging the second engaging portion with the first engaging portion of the rotating body and the second engaging portion of the main body to prevent the rotating body from rotating relative to the main body. It is provided with a movement preventing body. Therefore, by using the anti-rotation body when replacing the drilling blade, the rotating body can always be held at a fixed position with respect to the main body. The danger of turning and cutting the hand with the drilling blade can be reliably avoided, and the drilling blade can be replaced with peace of mind.
[0023]
The main body of the drilling tool according to the claim 1 is Ru Tei includes a cover body for preventing the scattering of chips. Therefore, the side of the cover body can be opened, and the drilling blade of the rotating body that is prevented from rotating from the opening can be replaced, so that the operation can be performed by putting a hand into the narrow gap from the front opening of the cover body. The replacement work can be performed safely and easily as compared with the case of doing so.
[0024]
According to a second aspect of the present invention, there is provided a rotation preventing structure for a drilling blade provided in a rotating body provided with a drilling blade of a drilling tool, and a through-hole penetrating in the rotation axis direction and a chip provided in a main body of the drilling tool. An insertion part provided in the cover body that prevents scattering, corresponding to the through hole of the rotating body, and a through hole of the rotating body, and a tip part is inserted into the insertion part of the cover body And a rotation preventing body for preventing the rotating body from rotating relative to the main body. Therefore, in particular, the rotation of the rotating body can be prevented with a simple structure.
[0025]
According to a third aspect of the present invention, there is provided the rotation preventing structure for the drilling blade according to the first or second aspect , wherein the cover body can be opened laterally, and when the rotation prevention body is attached, The piercing blade of the rotating body is held at a position facing the opening on the side of the cover body. Therefore, especially when exchanging the drilling blade, the drilling blade faces the opening of the cover body, so that the exchanging operation of the drilling blade can be performed reliably and safely.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rotation preventing structure for a drilling blade in an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a rotation prevention structure for a drilling blade in an embodiment of the present invention.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a perspective view showing a state when exchanging the drilling blade of FIG. 1; FIG.
FIG. 5 is a perspective view showing a conventional punch.
FIG. 6 is a perspective view showing a state in which a drilling blade in a conventional drilling tool is replaced.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drilling tool 4 Rotating body 4c Through-hole 8 Main body 9 Cover body 9c Insertion part 10 Anti-rotation pin

Claims (3)

In a drilling tool for drilling a through hole in a wall material or the like by rotating a rotating body provided with a drilling blade with respect to a main body provided with a cover body that prevents scattering of chips, the rotation with respect to the main body A structure for preventing rotation of a perforated blade capable of preventing rotation of the body ,
A first engagement portion provided on a rotating body provided with the drilling blade;
A second engagement portion provided on the main body, and a drilling tool comprising:
At the time of exchanging the drilling blade, the rotating body is inserted from the opening of the cover body and engaged with the first engaging portion of the rotating body and the second diameter portion of the main body, so that the rotating body is relative to the main body. rotation prevention structure of the cutting head, characterized in that manner to anda rotation preventing member to prevent the rotation. In the drilling tool in which the rotating body provided with the drilling blade of the drilling tool rotates the hole relative to the main body to drill the through hole in the wall material or the like,
Provided on the rotating body, a through hole penetrating in the axial direction,
An insertion part provided corresponding to the through hole of the rotating body in the cover body for preventing the scattering of chips provided in the main body of the punching tool;
During replacement of the cutting head, as well as through the through hole of the rotating body, in Rukoto is inserted into the insertion portion of the tip portion the cover member, the rotating member relative to the body is relatively rotated rotation prevention structure of the cutting head, characterized by comprising a locking pin to prevent the. The cover body can be opened to the side, and when the rotation preventing body is attached, the drilling blade of the rotating body is held at a position facing the side opening of the cover body. The rotation prevention structure for a drilling blade according to claim 1 or 2 .

Images