JPH1150773A - Vertical hole drilling bit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drill a vertical hole with a desired diameter according to the kind of a vertical hole and also always transport each bit in the assembled state by removably assembling a small-diameter bit at the tip, a medium- diameter bit in the middle and a largediameter bit at the base end in such a manner as to be substantially like an inverted cone and connecting the same one another. SOLUTION: A vertical hole drilling bit M installed at the lower end of a rotary auger (m) comprises a small-diameter bit A, a mediumdiameter bit B and a large-diameter bit C, wherein each bit is formed by a cutter suspended on the lower surface of a three-way radial rotary b de, a connecting shaft having a substantially rectangular section, and a fitting hole. The small-diameter bit A, the medium-diameter bit B in the middle, and the largediameter bit C at the base end are respectively removably assembled in such a manner as to be substantially like an inverted cone to be connected to one another. In the case of erecting a power mast, drilling is performed by the whole formed like an inverted cone, and in the case of erecting a mast for telephone works, drilling is performed by the combination of the medium-diameter bit B and the small-diameter bit A without the large-diameter bit C.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は、竪孔掘削用ビッ
トに関する。The present invention relates to a bit for excavating a pit.

【０００２】[0002]

【従来の技術】従来、竪孔掘削用ビットとしては、竪孔
の径の大きさに応じたビットを個別に用意して、用途に
応じて排土オーガの先端につけ換えをしていた。2. Description of the Related Art Conventionally, as a bit for pit excavation, a bit corresponding to the diameter of the pit has been prepared individually and replaced with the tip of an earth removal auger according to the application.

【０００３】たとえば、交通信号用や水銀灯用の電柱を
立設するための竪孔は、小径用ビットを用い、電話工事
用電柱を立設するための竪孔は、中径用ビットを用い、
電力用の電柱を立設するための竪孔は、大径用ビットを
用いており、竪孔の種類により、これらのビットを選択
して付け換えしている。[0003] For example, a vertical hole for erecting a power pole for a traffic signal or a mercury lamp uses a small-diameter bit, and a vertical hole for erecting a telephone pole for telephone work uses a medium-diameter bit.
A vertical hole for erecting a power pole for electric power uses a large-diameter bit, and these bits are selectively replaced according to the type of the vertical hole.

【０００４】[0004]

【発明が解決しようとする課題】ところが、竪孔の種類
によりビットを取り換えるためには、これらの多種のビ
ットを、個別に携帯しておかねばならず、また、従来の
ビットは、水平状の回転翼の下面にカッタを突設した形
状のものであったため、水平掘削による竪孔形成の掘削
効率も良好でない欠点があった。However, in order to change bits depending on the type of the pit, it is necessary to carry these various bits individually. Since the cutter had a shape protruding from the lower surface of the rotor, there was a disadvantage that the excavation efficiency of forming a vertical hole by horizontal excavation was not good.

【０００５】[0005]

【課題を解決するための手段】この発明は、先端に小径
用ビットを、中間に中径用ビットを、基端に大径用ビッ
トを、それぞれ取り外し自在に組立て連結してなる竪孔
掘削用ビットを提供せんとするものである。SUMMARY OF THE INVENTION The present invention is directed to a vertical digging method in which a small-diameter bit is provided at a distal end, a medium-diameter bit is provided at an intermediate portion, and a large-diameter bit is provided at a base portion. It does not provide any bits.

【０００６】また、各ビットの放射状の回転翼は、回転
方向の回転翼ほど漸次長く形成したことにも特徴を有す
る。Also, the radial rotor of each bit is characterized in that it gradually becomes longer as the rotor in the rotational direction becomes longer.

【０００７】[0007]

【発明の実施の形態】この発明では、回転オーガの先端
に大径用ビットを、その下方に中径用ビットを、更に、
その下方に小径用ビットを取付けて竪孔の掘削作業を行
う。In the present invention, a large-diameter bit is provided at the tip of a rotating auger, a medium-diameter bit is provided below the large-diameter bit, and
Excavation work of the pit is carried out by attaching a small diameter bit below it.

【０００８】各ビットは、上方から下方に向って大径、
中径、小径と漸次略円錐状に形成されることになり、し
かも各ビットの回転翼は回転方向の回転翼ほど漸次長く
形成しているため、円滑な掘削土の細粒化・細粉砕化が
可能となる。Each bit has a large diameter from top to bottom.
Medium and small diameters are gradually formed into a substantially conical shape, and the rotating blades of each bit are formed gradually longer as the rotating blades in the rotating direction become smoother. Becomes possible.

【０００９】しかも、竪孔の径の種類に応じて各ビット
を取り付け、取り外しすることにより、適確な掘削作業
が行える。In addition, by attaching and detaching each bit according to the type of the diameter of the pit, accurate excavation work can be performed.

【００１０】更には、各ビットの脱着作業も竪孔の種類
に応じて不要のビットを取り外すのみですむために、ビ
ットの搬送、脱着作業も簡便に行なえる。[0010] Furthermore, since it is only necessary to remove unnecessary bits in accordance with the type of the pit, it is possible to easily carry and remove the bits.

【００１１】[0011]

【実施例】この発明の実施例を図面にもとづき詳説する
と、図１は、本発明の竪孔掘削用ビットＭを回転オーガ
ｍ下端に装着した状態を示す説明図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a state in which a bit M for excavating a pit is mounted on the lower end of a rotating auger m.

【００１２】竪孔掘削用ビットＭは、図４〜図９に示す
ように、小径用ビットＡと中径用ビットＢと、大径用ビ
ットＣとより構成されている。As shown in FIGS. 4 to 9, the bit M for excavating a pit includes a bit A for small diameter, a bit B for medium diameter, and a bit C for large diameter.

【００１３】各ビットＡ，Ｂ，Ｃは、三方に放射状の回
転翼ａ，ｂ，ｃと、その下面に垂設したカッター１，
２，３と、中央上方に突設した断面略矩形状の連結シャ
フト４，５，６と、中央下部に穿設した嵌入孔７，８，
９とより、それぞれ構成されている。Each of the bits A, B, and C has three rotating rotors a, b, and c, and cutters 1,
2, 3; connecting shafts 4, 5, 6 having a substantially rectangular cross section projecting upward from the center;
9, respectively.

【００１４】しかも、各ビットＡ，Ｂ，Ｃは、それぞれ
の回転翼ａ，ｂ，ｃが、ビットの回転方向にある回転翼
ほど順次長く形成されており、従って、回転翼ａ，ｂ，
ｃは、それぞれ長さがすべて異なるように形成されてい
る。In addition, each of the bits A, B, and C is such that each of the rotary blades a, b, and c is formed so as to be sequentially longer as the rotary blades are in the direction of rotation of the bit.
c are formed so as to have different lengths.

【００１５】図５、図７、図９に基づいて説明すると、
回転方向Ｒを矢印の方向とすれば、回転翼ａの長さaL
と、回転翼ｂの長さbLと回転翼cLとの長さの関係はaL<b
L<cLとなる。Referring to FIG. 5, FIG. 7, and FIG.
If the rotation direction R is the direction of the arrow, the length aL of the rotor a
And the relationship between the length bL of the rotor b and the length of the rotor cL is aL <b
L <cL.

【００１６】更には、小径用ビットＡの連結シャフト４
は、中径用ビットＢの嵌入孔８に下方より嵌着自在であ
り、中径用ビットＢの連結シャフト５は、大径用ビット
Ｃの嵌入孔９に下方より嵌着自在であり、大径用ビット
Ｃの連結シャフト６は回転オーガｍの下端の嵌入孔10に
下方より嵌着自在である。Further, the connecting shaft 4 of the small diameter bit A
Can be fitted into the fitting hole 8 of the medium-diameter bit B from below, and the connecting shaft 5 of the medium-diameter bit B can be freely fitted into the fitting hole 9 of the large-diameter bit C from below. The connecting shaft 6 of the diameter bit C can be fitted into the fitting hole 10 at the lower end of the rotating auger m from below.

【００１７】Ｄは、小径用ビットＡの下方に連結したヘ
ッドカッターを示し、ヘッドカッターＤの中央上部に
は、小径用ビットＡの嵌入孔７に嵌着自在の連結シャフ
ト11が突設されている。Reference character D denotes a head cutter connected below the small diameter bit A, and a connection shaft 11 protruding from the upper portion of the center of the head cutter D so as to fit into the insertion hole 7 of the small diameter bit A. I have.

【００１８】12は、連結シャフト４，５，６，11の周面
に形成した固定用孔、13は固定ボルトを示す。Reference numeral 12 denotes a fixing hole formed on the peripheral surface of the connection shafts 4, 5, 6, and 11, and reference numeral 13 denotes a fixing bolt.

【００１９】また、小径用ビットＡと中径用ビットＢと
大径用ビットＣの各回転翼ａ，ｂ，ｃは、小径用から大
径用に至る回転翼程長く形成されており、しかも、各回
転翼ａ，ｂ，ｃは同一ビットにおいて、回転方向に向う
程順次長く形成されていることになり、従って、大、
中、小径用の各ビットは、すべて長さが異なり、かつ回
転方向に向う程長く形成されたことになる。The rotating blades a, b, and c of the small-diameter bit A, the medium-diameter bit B, and the large-diameter bit C are formed to be longer as the rotary blades from the small-diameter to the large-diameter are used. , Each of the rotary blades a, b, and c is formed so as to be sequentially longer in the same bit as it goes in the rotation direction.
Bits for medium and small diameters are all different in length, and are formed to be longer in the direction of rotation.

【００２０】この発明の実施例は上記のように構成され
ており、電力用電柱を立設する大径の竪孔を掘削する場
合には図１に示すように、回転オーガｍに、大径用ビッ
トＣを連結し、次いで中径用及び小径用の各ビットＢ，
Ａを連結し、全体を逆円錐形状に形成する。The embodiment of the present invention is configured as described above. When excavating a large-diameter vertical hole on which an electric power pole is to be erected, as shown in FIG. Bits C for the medium diameter and the bits B for the small diameter,
A is connected and the whole is formed in an inverted conical shape.

【００２１】他方、電話工事用電柱を立設する中径の竪
孔を掘削する場合には、すでに組立てた大径用、中径
用、小径用の各ビットから、大径用ビットＣを取り外し
て中径用ビットＢと小径用ビットＡの組合わせにより掘
削する。On the other hand, when excavating a medium-diameter pit where a telephone pole for telephone work is to be erected, the large-diameter bit C is removed from the large-diameter, medium-diameter, and small-diameter bits already assembled. Excavation is performed by combining the bit B for medium diameter and the bit A for small diameter.

【００２２】また、交通信号用や水銀灯用の電柱を立設
する小径の竪孔を掘削する場合には、中径用及び大径用
の各ビットＢ，Ｃを取り外して掘削する。In the case of excavating a small-diameter pit on which an electric pole for a traffic signal or a mercury lamp is erected, the bits B and C for the medium-diameter and the large-diameter are removed and excavated.

【００２３】勿論、いずれの掘削形態でもヘッドカッタ
ーＤはビットの中央下部に装着しておく。Of course, in any excavation mode, the head cutter D is mounted at the lower center of the bit.

【００２４】このように、本発明の実施例では、必要に
応じて各ビットを取り付け、或は取り外して使用できる
ため、装着作業が簡便であり、また、各ビットの組合わ
せでは、逆円錐形状に形成できるので掘削作業が円滑と
なる。As described above, according to the embodiment of the present invention, each bit can be attached or detached as required, so that the mounting operation is simple. Excavation work can be performed smoothly.

【００２５】更には、回転翼の長さが異なるので、掘削
効率もよく、土壌の細粒化、細粉砕化が充分に行える効
果がある。Further, since the lengths of the rotor blades are different, the excavation efficiency is good, and there is an effect that the soil can be sufficiently refined and pulverized.

【００２６】[0026]

【効果】この発明によれば、請求項１の発明では小径用
ビット、中径用ビット及び大径用ビットを略逆円錐形状
になるように組立て、しかも竪孔の種類に応じて必要に
より大径用、中径用の各ビットを取り去ることにより所
望の径の竪孔を掘削することができ、しかも、常に各ビ
ットの組立て状態で搬送が行える効果がある。According to the present invention, the small-diameter bit, the medium-diameter bit and the large-diameter bit are assembled so as to have a substantially inverted conical shape in accordance with the first aspect of the present invention. By removing the diameter and medium diameter bits, it is possible to excavate a vertical hole having a desired diameter, and it is possible to always carry the bits in the assembled state.

【００２７】請求項２の発明では、各ビットの回転翼が
回転方向ほど漸次長く形成したので、土壌の細粒化、細
粉砕化が充分に行える効果を有する。According to the second aspect of the present invention, since the rotating blades of each bit are formed gradually longer in the direction of rotation, there is an effect that the soil can be sufficiently refined and pulverized.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明ビットの使用時の全体図。FIG. 1 is an overall view when a bit of the present invention is used.

【図２】ヘッドカッタの側面図。FIG. 2 is a side view of a head cutter.

【図３】同底面図。FIG. 3 is a bottom view of the same.

【図４】小径用ビットの側面図。FIG. 4 is a side view of a small diameter bit.

【図５】同底面図。FIG. 5 is a bottom view of the same.

【図６】中径用ビットの側面図。FIG. 6 is a side view of a medium diameter bit.

【図７】同底面図。FIG. 7 is a bottom view of the same.

【図８】大径用ビットの側面図。FIG. 8 is a side view of a large diameter bit.

【図９】同底面図。FIG. 9 is a bottom view of the same.

【図１０】各ビットの組付け状態を示す側面図。FIG. 10 is a side view showing an assembled state of each bit.

【図１１】同底面図。FIG. 11 is a bottom view of the same.

【符号の説明】[Explanation of symbols]

Ａ 小径用ビット Ｂ 中径用ビット Ｃ 大径用ビット ａ 回転翼 ｂ 回転翼 ｃ 回転翼 ４ 連結シャフト ５ 連結シャフト ６ 連結シャフト ７ 嵌入孔 ８ 嵌入孔 ９ 嵌入孔 A Bit for small diameter B Bit for medium diameter C Bit for large diameter a Rotating blade b Rotating blade c Rotating blade 4 Connecting shaft 5 Connecting shaft 6 Connecting shaft 7 Fitting hole 8 Fitting hole 9 Fitting hole

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 先端に小径用ビットを、中間に中径用ビ
ットを、基端に大径用ビットを、それぞれ取り外し自在
に組立て連結してなる竪孔掘削用ビット。1. A bit for excavating a pit, wherein a bit for a small diameter is provided at a distal end, a bit for a medium diameter is provided at an intermediate portion, and a bit for a large diameter is provided at a proximal end so as to be detachably connected. 【請求項２】 各ビットの放射状の回転翼は、回転方向
の回転翼ほど漸次長く形成したことを特徴とする請求項
１記載の竪孔掘削用ビット。2. The pit excavation bit according to claim 1, wherein the radial rotary wing of each bit is formed so as to be gradually longer toward the rotary direction.