JPH0886181A - Excavating tool - Google Patents

Abstract

PURPOSE: To improve an excavating tool, so that a headed spring pin for drive fitting an excavating tool main body into a tool mounting part is applicable. CONSTITUTION: A tool main body 3 of an excavating tool 1 is fitted into a tool mounting part 4, and fixed by a headed spring pin 5. The spring pin 5 comprises a head part 5a and a shaft part 5b, wherein a first slotting groove 12 extended over the total length and a second slotting groove 13 extended from the head part 5a to the middle of the shaft part 5b are formed in the axial direction. The second slotting groove 13 assists a deformation function in the head part 5a of the first slotting groove 12. In the case of driving the spring pin 5 directly into fitting holes 10, 11, deformation for surely reducing the width of the first slotting groove 12 is applied. In the case of driving a fixing pin into a through hole of the spring pin 5, deformation for increasing the width of the first slotting groove 12 is applied. A mounting ring having a deformation function is installed in the fitting hole 11 positioned on the center side. A casing bit, an auger bit and a chipper and so on are applied as the excavating tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling tool, and more particularly to a tool body having a drilling tip attached to and detached from a tool mounting portion by a spring pin having a head.

[0002]

2. Description of the Related Art Conventionally, as an excavating tool of this kind, one using a driving pin is, for example, Japanese Patent Laid-Open No. 5-1.
Those disclosed in Japanese Patent No. 57109, Japanese Utility Model Laid-Open No. 5-64290, etc. are known.

[0003]

However, in the one having the spring pin with a collar and the spring pin for driving shown in FIG. 3 of the former publication, since the strength of the collar portion is high, this portion is made small. This is necessary, and there is a problem in that during excavation, the progress of wear of this portion is accelerated. Also, since the mounting strength is not so high,
There was a problem that the drilling tip was damaged due to backlash and the life was shortened.

Further, in the case of utilizing the elastic ring as disclosed in the latter publication, there is a problem that the driving pin cannot be fixed unless the assembly crossing is good and the removal of the driving pin is very difficult due to the presence of earth and sand. there were.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and a tool main body having a drilling tip is fitted into a tool mounting portion, and a mounting provided in common to both of them. The hole provides a mounting structure for a drilling tool in which a spring pin with a head is driven.

That is, the spring pin comprises a head portion and a shaft portion, and in the axial direction thereof, a first slit groove extending over the entire length and a second slit groove extending halfway from the head portion to the shaft portion. Each is prepared. Also, to enhance the elastic deformation function, a through hole should be drilled in the axial center of the spring pin, and it is applicable both when driving into the mounting hole and when driving the fixing pin into the through hole. To be done. Further, also in the case of the sleeve shape for the first slit groove,
Since it has an elastic force, it does not need to extend over the entire length, and a part may be left on the opposite side of the head. In this case, it is possible to form the third slit groove on the opposite side.

Further, in the excavating tool of the present invention, if the mounting ring is provided in the mounting hole located on the center side among the mounting holes, the function of closely adhering to the spring pin is enhanced, which is effective.

Further, regarding the fitting structure of the tool body and the tool mounting portion, first, after the shank portion of the tool body is mounted in the mounting hole formed in the block-shaped holder constituting the tool mounting portion, the holder and The case where the spring pin is mounted through the mounting hole provided through the side portion of the shank portion is applied. Also, on the shank portion side, a split groove is formed in the central portion so as to form a bifurcated mounting portion, and when the mounting portion and the split groove are fitted to the center remaining portion and the side recessed portion of the holder, the tool is The case where the internal socket is bored on the main body side and the tool mounting portion side is inserted into the internal socket is applied.

[0009]

In the excavating tool of the present invention, since the first slit and the second slit are formed in the head portion of the spring pin used for mounting, the diameter of the spring pin is reduced. The function of expanding the diameter can be surely performed. That is, when the spring pin is directly driven into the mounting hole, it has a function of narrowing the width of the first slit groove and widening the width of the second slit groove.

On the other hand, when the fixing pin is driven into the through hole of the spring pin, the width of the first slit groove is widened and the width of the second slit groove is narrowed. In short, the conventional product without the second slit is
The strength of the head is large, and the deforming function becomes small accordingly, so that the head cannot be designed large.

[0011]

EXAMPLES Examples of drilling tools according to the present invention will be described below.
Description will be given with reference to the drawings.

1 to 3, reference numeral 1 denotes a drilling tool applied to a casing bit, in which a tool main body 3 having a drilling tip 2 is fitted in a tool mounting portion 4 and a spring pin with a head. Fixed by 5. In this case, the tool mounting portion 4 is applied with the block-shaped holder 4 and welded into the notch portion of the casing tube (not shown).
Regarding the fitting of the tool body 3 and the holder 4, the shank portion 3a on the tool body 3 side is provided with the dividing groove 7 in the central portion so as to form the bifurcated mounting portions 6, 6, and the holder 4 side Is provided with side recesses 9, 9 so as to form a central remaining portion 8. Further, both the tool body 3 and the holder 4 are provided with mounting holes 10 and 11 having a common axis line.
A spring pin 5 with a head is driven into this. Further, the mounting holes 10 are formed separately from the mounting portions 6 and 6, but in the case of the illustration, one mounting hole 10a is
The taper hole is formed so as to fit the head portion 5a of the spring pin 5, and the other mounting hole 10b is formed as a circular hole.

Therefore, the spring pin 5 has the structure shown in FIG.
As clearly shown in (a) to (d), it is composed of a head portion 5a and a shaft portion 5b, and in the axial direction of the shaft portion 5b, a first slit slot 12 extending over the entire length and a shaft portion from the head portion 5a. The second slit grooves 13 extending to the middle of the portion 5b are provided at positions displaced in the circumferential direction. In this case, the second
The two slit grooves 13 are added so that the first slit grooves 12 can be easily deformed so that the width of the first slit grooves 12 can be reduced during the driving. As a result, the deformation amount of the head portion 5a having the large diameter is adjusted to be substantially equal to the deformation amount of the shaft portion 5b. In addition, the spring pin 5 can be removed by the shaft portion 5b.
It is performed by applying a striking force by applying a driver (not shown) to the end of the.

5 to 7, the drilling tool 1 is also applied to a casing bit, but the tool body 3
Regarding the fitting into the holder 4, the shank 3a of the tool body 3 is inserted into the mounting hole 4a of the holder 4. As clearly shown in FIG. 7, the shank portion 3a is applied with bulges on both end sides in consideration of stability during mounting. Further, for example, a C-shaped mounting ring 14 shown in FIGS. 8A and 8B, which has a deforming function, is located in the mounting hole 11 located on the center side. This is to increase the adhesion with the spring pin 5 and increase the mounting strength. When the spring pin 5 is removed, the inner diameter of the mounting hole 11 can be made larger than that of the mounting hole 11a, so that the spring pin 5 is prevented from coming off and can be retained in the mounting hole 11 as it is.

Further, as the spring pin 5 as shown in FIG. 9 is applied, a through hole 15 is bored in the central portion of the shaft in order to enhance the deforming function, and the overall shape is a slit. It is shaped like a hump. Also, the second
The slit slot 13 is illustrated as being located at a position opposite to the first slit groove 12 on the same radius line. The spring pin 5 is directly driven into the mounting holes 10 and 11. Therefore, the deformation function of the head portion 5a is the same as that in FIG. 4 described above.

Further, in the spring pin 5 shown in FIG. 10, the head portion 5a has a cylindrical shape.
Two slit slots 13 are formed as in FIG.
The fixing pin 16 is driven into the through hole 15 of the spring pin 5. And this spring pin 5
Unlike the above-described deformation function, the width of the first slit groove 12 is expanded and the width of the second slit groove 13 is reduced. If the fixing pin 16 is removed by applying a striking force from the head 5a side of the spring pin 5,
Can be removed alone. This is because the impact force from the opposite direction causes the spring pin 5 to come off together. Further, the first slit groove 12 does not need to extend over the entire length due to the relation of the mounting hole 10b, and a part may be left on the opposite side of the head portion 5a as illustrated. If necessary, the third slit groove 17 can be formed on the opposite side. The third slit groove 17 is usually formed so as to extend beyond the end of the first slit groove 12.

In addition, FIG.
The shank portion 3a of the tool body 3 is attached to the attachment portion 21 of the holder 4 welded to the spiral blade 20. Then, the excavating tool 1 is mounted on the holder 4 by the spring pin 5 described above.
It is fixed to the spiral wing 20 via. Furthermore, FIG.
The excavating tool 1 is applied to a ripper for a civil engineering machine, and the tool mounting portion 4 is inserted into the internal socket 22 of the tool body 3. The spring pin 5 described above is also applied to the mounting in this case.

[0018]

As described above, according to the present invention, when the excavating tool 1 is attached, the spring pin 5 with a head is attached.
Is applied so that the deformation function of the head is surely obtained.

Therefore, there is an advantage that the excavation tool 1 can be easily attached and detached, and the time for replacement work can be shortened.

[Brief description of drawings]

FIG. 1 is a conceptual exploded perspective view showing an embodiment of a drilling tool of the present invention,

FIG. 2 is a front view showing a state of attachment to a holder,

FIG. 3 is a plan view in which a part is sectioned.

4A and 4B are explanatory views showing a spring pin, where FIG. 4A is a front view, FIG. 4B is a plan view, FIG. 4C is a side view from a diagonally lower left direction, and FIG. Figure,

FIG. 5 is a front view of another embodiment showing a state of attachment to a holder,

FIG. 6 is a plan view in which a part is sectioned,

FIG. 7 is a cross-sectional view of a shank portion,

FIG. 8 is an explanatory view of a mounting ring, (a) is a front view,
(B) is a side view,

FIG. 9 is an explanatory view showing another embodiment of the spring pin,
(A) is a front view, (b) is a right side view, (c) is a left side view, (d) is a partial sectional view with respect to a left side view,

FIG. 10 is a perspective view showing another embodiment of the spring pin.

FIG. 11 is a conceptual partial perspective view showing another embodiment of the drilling tool of the present invention;

FIG. 12 is a conceptual perspective view showing another embodiment of the drilling tool of the present invention.

[Explanation of symbols]

 1 Drilling Tool 2 Drilling Tip 3 Tool Body 4 Tool Mounting Part (Holder) 5 Spring Pin 5a Head 5b Shaft 10 Mounting Hole 11 Mounting Hole 12 First Sliding Groove 13 Second Sliding Groove 14 Mounting Ring 15 Penetration Hole 16 Fixing pin 17 Third slit slot 22 Internal socket

Claims (9)

[Claims] 1. A tool main body 3 having a drilling tip 2 is fitted into a tool mounting portion 4, and a headed spring is provided in mounting holes 10 and 11 provided in common to both of them. In the excavating tool in which the pin 5 is driven, the spring pin 5 has a head portion 5a and a shaft portion 5b, and in the axial direction thereof, a first slit groove 12 and a first slit groove 12 extending over the entire length. The slotting groove 12 is a second slotting groove 13 which is located at a position displaced in the circumferential direction and extends from the head portion 5a to the middle of the shaft portion 5b. 2. The excavating tool according to claim 1, wherein among the mounting holes 10 and 11 according to claim 1, a mounting ring 14 is provided in the mounting hole 11 located on the center side. 3. The spring pin 5 according to claim 1,
By forming the through hole 15 in the central portion of the shaft,
The drilling tool according to claim 1 or 2, which has a sleeve shape. 4. The excavating tool according to claim 1, wherein a fixing pin 16 is driven into the through hole 15 of the spring pin 5 according to claim 3. 5. The excavating tool according to claim 3, wherein the spring pin 5 according to claim 3 has the first slit groove 12 extending to the vicinity of the opposite end of the head portion 5a. 6. The spring pin 5 according to claim 5 has a head portion 5a at a circumferential position displaced from the first slit groove 12.
6. The drilling tool according to claim 5, further comprising a third slit groove 17 extending axially from the opposite end to the end of the first slit groove 12. 7. The tool body 3 according to claim 1, after being mounted in a mounting hole 4a formed in a block-shaped holder 4, penetrates the holder 4 and a side portion of the shank portion 3a of the tool body 3. 7. The drilling tool according to claim 1, wherein the drilling tool is mounted by the spring pin 5 from the mounting holes 10 and 11 provided in the hole. 8. On the shank portion 3a side according to claim 7, a dividing groove 7 is formed in the central portion so as to form a bifurcated attaching portion 6, 6, and the dividing groove 7 and the attaching portion 6,
7. The drilling tool according to claim 1, wherein 6 is fitted in the holder 4. 9. An internal socket 21 is bored on the shank portion 3a side according to claim 7, and the internal socket 2
The excavating tool according to claim 1, wherein the tool mounting portion 4 is inserted into the tool 1.