JP2004084409A

JP2004084409A - Cylindrical structure chuck device

Info

Publication number: JP2004084409A
Application number: JP2002250182A
Authority: JP
Inventors: Chiaki Kageyama; 影山　千秋
Original assignee: JUKANKYO SEKKEISHITSU KK
Current assignee: JUKANKYO SEKKEISHITSU KK
Priority date: 2002-08-29
Filing date: 2002-08-29
Publication date: 2004-03-18
Anticipated expiration: 2022-08-29
Also published as: JP3963011B2

Abstract

<P>PROBLEM TO BE SOLVED: To realize structural simplification by saving power equipment such as hydraulic equipment. <P>SOLUTION: For transmission of rotation of a rotary driveshaft to a cylindrical structure fitted thereon, a cylindrical structure chuck device positions a plurality of chuck pieces between them. A cylindrical structure side periphery of the rotary driveshaft is formed in a polygon, and a rotary driveshaft side face and a cylindrical structure side face of each chuck piece are respectively formed in a face capable of abutting one or two adjacent flat portions of the polygon and in a curved face capable of abutting the cylindrical surface of the structure. Each chuck piece is supported on the rotary driveshaft as allowed to move slightly in a radial direction of the rotary driveshaft and to move slightly in an axial direction when pushed by the cylindrical structure fitted on the rotary driveshaft, so that when the rotary driveshaft is rotated, vertices on the longest diameter of either the polygonal surface of the rotary driveshaft or the opposing chuck piece surface lock upstream of middle points on the shortest diameter of the other with respect to the rotation direction to effect final chucking. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、基礎杭その他種々の円筒状構造体を回転させつつ地中に埋設する装置又は上記円筒状構造体を所要目的のため回転させる装置において、回転駆動軸の回転を円筒状構造体に伝達するため該円筒状構造体を回転駆動軸にチャックするためのチャック装置に関する。
【０００２】
【従来の技術】
従来、下端に掘削刃を設けた鋼管杭の回転圧入装置や、外周面にらせん翼を設けた鋼管杭の回転埋設装置における鋼管杭チャック装置として、回転駆動部がわに、油圧シリンダにより開閉されるチャックバンドを上記鋼管杭を囲む状態に支持させ、該チャックバンドの締着により鋼管杭を回転駆動部に回転伝達可能にチャックするものや、油圧シリンダにより進退されるクサビを上記鋼管杭と回転駆動部との間に楔入させて鋼管杭を回転駆動部に回転伝達可能にチャックするものが知られている。
【０００３】
しかし、これら従来装置は、いずれも、油圧シリンダ及び油圧源を必要とし、しかも前者のバンド方式では、油圧シリンダを回転部に、油圧源を固定部にそれぞれ配置するため、鋼管杭回転時及び停止時ごとに油圧シリンダと油圧源を接離する面倒な操作が必要となるばかりでなく、回転しながらのチャックバンドの増し締めができない欠点があり、また後者のクサビ方式では、構造が複雑となる等の難点があった。
【０００４】
【発明が解決しようとする課題】
本発明は、油圧機器を一切省略し、それに伴い従来装置にみられた油圧シリンダと油圧源との面倒な接離操作を解消し、しかも構造の簡素化を実現することを課題とする。
【０００５】
【課題を解決するための手段】
そこで、本発明は、
回転駆動軸の回転を、これと嵌合された円筒状構造体に伝達すべく両者間に複数のチャックピースを介在させ、
上記回転駆動軸の円筒状構造体がわ周面を多角形に形成すると共に、上記各チャックピースの回転駆動軸がわ面を上記多角形の１又は隣接２平面部に当接しうる面に、円筒状構造体がわ面を該構造体の円筒面に当接しうる湾曲面にそれぞれ形成し、
上記各チャックピースは、回転駆動軸の径方向に若干移動自在且つ回転駆動軸に嵌合される円筒状構造体に押されて軸方向に若干移動自在の状態で、上記回転駆動軸にそれぞれ支持され、
上記各チャックピースを、上記軸方向移動時に、円筒状構造体がわに移動させて初期チャックを行わせるカム手段を備え、
上記回転駆動軸の回転により、該回転駆動軸の多角面及びそれと対面するチャックピース面のいずれか一方の最長径の頂点が他方の最短径の中点より回転方向手前に係止して最終チャックを行うようにした、
円筒状構造体チャック装置を提案する。
【０００６】
本発明における「回転駆動軸と円筒状構造体の嵌合」とは、円筒状構造体内周に回転駆動軸を嵌入するもの、及び円筒状構造体外周に中空回転駆動軸を被嵌するものを含む。
【０００７】
また、上記「カム手段」は、上記チャックピースの上端部及び回転駆動軸のそれに対応する部位のいずれか一方又は両方にカムを設けたもの、上記チャックピースの中間部及び回転駆動軸のそれに対応する部位のいずれか一方又は両方にカムを設けたもの、上記チャックピースの下端部及び回転駆動軸のそれに対応する部位のいずれか一方又は両方にカムを設けたもの、上記チャックピースの上、下両端部及び回転駆動軸のそれに対応する両部位のいずれか一方又は両方にカムを設けたもの、その他種々の態様のものがある。
以下図面を参照して本発明の実施例について詳述する。
【０００８】
【実施例】
図１、２、３は円筒状杭の上端部を回転駆動軸の外周に被嵌するタイプに実施した例である。図１において、モータ（２）及び減速機（３）を備えた回転駆動装置（１）をリーダマスト（４）に昇降自在に支持させ、該駆動装置（１）の下端から下方へ突出した六角軸の出力軸（５）に、本例では六角軸からなる回転駆動軸（６）を、その上部の六角ソケット（７）を嵌合することにより同心的に接続し、この駆動軸（６）の外周に、円筒状構造体として、本例では鋼管からなる円筒状杭（８）の上端部分をチャックピース（９）…を含む本発明のチャック装置を介して着脱自在に被嵌する。（１０）は出力軸（５）とソケット（７）とに差しこんだ接続ピンである。
【０００９】
上記チャック装置の構造は次のようである。まず、回転駆動軸（６）は、図２（イ）、（ロ）に示すように、正六角軸の軸本体の上端に、上方へ拡大するテーパーカム面（１１’）を外周面に有する逆切頭円錐状カム（１１）と、それと連続してソケット（７）との間に短軸（１２）とを形成し、該短軸（１２）に上部リング（１３）を軸方向へ若干距離摺動自在に被嵌すると共に、該リング（１３）の外周縁に、上記カム面（１１’）と適宜間隔をあけたフランジ状上部ホルダー（１４）を下向きに突設してあり、また駆動軸（６）の下端部には、短筒状下部リング（１５）をピン（１７）により固定すると共に、該リング（１５）の外周縁に、上記駆動軸（６）外側面と適宜間隔をあけたフランジ状下部ホルダー（１６）を上向きに突設してある。
【００１０】
上記チャックピース（９）…は、本例では六角駆動軸（６）に対応して板状体の６枚で構成されており、各ピース（９）…の駆動軸（６）がわの内側面を、該六角軸の各平面部（６’）とほぼ同一幅で該平面部（６’）にほぼ全面当接しうる平面に、また円筒状杭（８）がわの外側面を該円筒状杭（８）の円筒内周面に全面当接しうる湾曲面に形成し、さらにチャックピース（９）…の上端部の内側面に、上記テーパーカム面（１１’）に対応するテーパー従動面（９’）…を形成すると共に、上端部外側面に受動フランジ（１８）…を突設し、該フランジ（１８）…は、円筒状杭（８）がチャックピース（９）…の外周に被嵌されたとき、該杭（８）上端の押し上げを受ける。
【００１１】
上記のようなチャックピース（９）…は、常時はその下端部を下部リング（１５）のホルダー（１６）内側に自重により降下すると共に、上端部を、自重により降下する上部リング（１３）のフランジ（１４）内側に位置させてそれぞれ保持されると共に、そのテーパー従動面（９’）…をテーパーカム面（１１’）に対面させた最下位の位置にあり、しかもチャックピース（９）…の上端部はホルダー（１４）との間に若干距離径方向（円筒状杭方向）へ移動できるクリアランス（ａ）…を、下端部はホルダー（１６）との間に同じくクリアランス（ｂ）をそれぞれ設けると共に、上部リング（１３）は上記ソケット（７）との間に若干距離軸方向へ移動を許すクリアランス（ｃ）を設けてある。
【００１２】
上記チャックピース（９）…の駆動軸（６）及び円筒状杭（８）に対する関係についてみると、上述の最下位にあるときのチャックピース（９）…は、図２（ロ）に示すように駆動軸（６）の平面部（６’）…にピース内側平面を平行に当接もしくは対面させて円筒状杭（８）の内周面に対し非圧接の状態をとり、それにより駆動軸（６）の回転を円筒状杭（８）に伝達しないチャック解除の状態をとる関係にある。またチャックピース（９）…が押し上げられ、その従動面（９’）…がカム面（１１’）に押されて図３（イ）のように径方向へ若干移動したときは、各チャックピースの上端部分が円筒状杭（８）の内周面に圧接して初期チャックに至る。その状態で駆動軸（６）が回転すると、同図（ロ）に示すように該駆動軸（６）における最長外径（Ｌ）の頂点（Ｐ）…がチャックピース（９）…における最短内径（ｌ）の中点（Ｑ）…より回転方向手前の点に係止して、駆動軸（６）の自由回転を抑止し、それにより駆動軸（６）の回転を円筒状杭（８）に伝達する最終チャック状態をとると共に、上記駆動軸（６）の頂点（Ｐ）…からチャックピース（９）…に及ぼす外方への押圧力により各チャックピース（９）…をさらに円筒状杭（８）内周面に圧接させてチャックを強化する関係におかれている。
【００１３】
（１９）は上記短軸（１２）に被嵌した伸縮性ゴムリングである。
【００１４】
上例の作用を操作とともに次に説明する。各部を図２の状態においた後、回転駆動装置（１）をマスト（４）の最上位まで上昇させ、その状態で接続すべき円筒状杭（８）をクレーンにより駆動軸（６）の下に吊りこむ。回転駆動装置（１）を徐々に降下させ、その駆動軸（６）を円筒状杭（８）の上端部内に挿入していく。各チャックピース（９）…の受動フランジ（１８）…が円筒状杭（８）上端に押されてチャックピース（９）…全体が押し上げられると、各従動面（９’）…がカム面（１１’）に押されて各チャックピース（９）…が径方向に移動して円筒状杭（８）内周面に圧接し、それにより初期チャックの状態に至る。そこで、モータ（２）の始動により回転駆動軸（６）を回転させると、図３（ロ）のように該駆動軸（６）の頂点（Ｐ）…がチャックピース（６）…の中点（Ｑ）…より手前の点にそれぞれ係止して最終チャック状態をとり、それにより駆動軸（６）の回転がチャックピース（９）…を介して円筒状杭（８）に確実に伝達されると共にチャック状態を強化される。
【００１５】
円筒状杭（８）を地中に埋設した後該杭（８）から駆動軸（６）を外す場合は、上記モータ（２）を寸動操作により小角度逆回転させて駆動軸（６）の平面部（６’）…に対しチャックピース（９）…の内側平面がほぼ平行に対面する図２（ロ）に近い状態におき、それにより上述のチャック強化を解除する。ついで回転駆動装置（１）を引き上げると、まず駆動軸（６）が、未だ円筒状杭（８）内周面に圧接しているチャックピース（９）…内から上記クリアランス（ｃ）だけ引き上げられ、それにより各チャックピース（９）…従動面（９’）…がカム面（１１’）から離脱して円筒状杭（８）との圧接から解放される。そこで回転駆動装置（１）をさらに引き上げると、チャックピース（９）…を装備された駆動軸（６）全体が円筒状杭（８）内から容易に抜き出される。
【００１６】
図４の他の実施例は、円筒状杭（８ａ）の上端部を中空回転駆動軸（６ａ）の内筒内に嵌入するタイプに実施した例である。回転駆動軸（６ａ）の正六角内筒内に、６枚のチャックピース（９ａ）…を保持させ、該チャックピース（９ａ）…は、駆動軸（６ａ）がわの外側面を駆動軸六角内筒の各１平面部（６’ａ）…とほぼ全面当接しうる平面に、円筒状杭（８ａ）がわの内側面を該杭（８ａ）の外周面にほぼ全面当接しうる湾曲面にそれぞれ形成してあり、これらチャックピース（９ａ）…を、駆動軸（６ａ）の内筒に設けた内側フランジ状上部ホルダー（１４ａ）及び内側フランジ状下部ホルダー（１６ａ）により、クリアランス（ａ）、（ｂ）、（ｃ）を設けて若干距離軸方向移動自在及び同じく径方向移動自在に保持してあり、他の構造は、図１、２、３に準じて適宜設計される。
【００１７】
本例においては、円筒状杭（８ａ）の上端部に駆動軸（６ａ）内筒を被嵌して各チャックピース（９ａ）…を受動フランジ（１８ａ）…を介して杭（８ａ）で押し上げると、各従動面（９’）…がカム面（１１’）に押されて各チャックピース（９ａ）…が径内方へ移動して杭（８ａ）外周面に当接し、初期チャックの状態に至る。ついで駆動軸（６ａ）を回転させると、図４（ハ）に示すように、各チャックピース（９ａ）…における最長外径（Ｌａ）、（Ｌａ）の両頂点（Ｐａ）、（Ｐａ）が、駆動軸（６ａ）における最短内径（ｌａ）の隣り合う平面部（６’ａ）、（６’ａ）の中点（Ｑａ）、（Ｑａ）より手前の点にそれぞれ係止して最終チャック状態をとると共に、チャック状態を強化する。
【００１８】
図５のさらに他の実施例は、回転駆動軸（６ｂ）の正六角内筒内に６枚のチャックピース（９ｂ）…を保持させ、各チャックピース（９ｂ）…の駆動軸（６ｂ）がわ外側面を、駆動軸六角内筒の隣接２平面部（６’ｂ）（６’ｂ）、…のほぼ各半面に当接しうる山形屈曲面に、円筒状杭（８ｂ）がわ内側面を該杭の外周面に当接しうろ湾曲面にそれぞれ形成し、他の構造は図４と実質的に同一である。本例によれば、最終チャックにおいて、同図（ロ）に示すように各チャックピース（９ｂ）…の最長外径（Ｌｂ）の頂点（Ｐｂ）が駆動軸（６ｂ）の最短内径（ｌｂ）の中点（Ｑｂ）より手前に係止する。
【００１９】
本発明における回転駆動軸の円筒状杭との嵌合周面には、四角形、五角形、六角形等の多角形であるが、楕円形に形成したものもある。
【００２０】
【発明の効果】
本発明の円筒状構造体チャック装置によれば、従来チャック装置に使用されていた油圧機器はもとより他の動力機器をも一切省略することができ、それに伴い装置全体の小型化、簡素化を実現することができ、しかも操作においては、回転駆動軸を回転させれば自動的にチャック状態をとることができると共に、従来装置におけるような油圧シリンダと油圧源との面倒な接離操作を解消でき、操作の能率化、簡素化を達成できるのである。
【図面の簡単な説明】
【図１】回転駆動装置に接続された本発明チャック装置の一部切欠正面図である。
【図２】（イ）チャック装置部分の一部切欠拡大正面図である。
（ロ）（イ）図のＡ−Ａ線断面図である。
【図３】（イ）チャック装置部分のチャック状態の一部切欠拡大正面図である。
（ロ）（イ）図のＢ−Ｂ線断面図である。
【図４】（イ）他の実施例の拡大縦断正面図である。
（ロ）（イ）図のＣ−Ｃ線断面図である。
（ハ）チャック状態の同上断面図である。
【図５】（イ）さらに他の実施例の図４（ロ）と同一切断面による断面図である。
（ロ）チャック状態の同上断面図である。
【符号の説明】
１　回転駆動装置
６、６ａ、６ｂ　回転駆動軸
６’、６’ａ、６’ｂ　回転駆動軸の平面部
８、８ａ、８ｂ　円筒状杭
９、９ａ、９ｂ　チャックピース
１１、１１ａ　カム
１１’、１１’ａ　カム面
１４、１４ａ　上部ホルダー
１６、１６ａ　下部ホルダー
１８、１８ａ　受動フランジ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for burying underground while rotating a foundation pile or other various cylindrical structures or a device for rotating the cylindrical structure for a required purpose, wherein the rotation of a rotary drive shaft is applied to the cylindrical structure. The present invention relates to a chuck device for chucking the cylindrical structure to a rotary drive shaft for transmission.
[0002]
[Prior art]
Conventionally, as a rotary press-fitting device for steel pipe piles provided with an excavation blade at the lower end, or a steel pipe pile chuck device in a rotary embedding device for steel pipe piles provided with spiral wings on the outer peripheral surface, the rotation drive unit is opened and closed by a hydraulic cylinder. A chuck band that supports the steel pipe pile in a state surrounding the steel pipe pile and tightens the chuck band to chuck the steel pipe pile so that rotation can be transmitted to a rotation drive unit, or a wedge that is advanced and retracted by a hydraulic cylinder rotates with the steel pipe pile. It is known that a steel pipe pile is inserted into a wedge between a drive unit and a chuck to transmit a rotation of a steel pipe pile to a rotation drive unit.
[0003]
However, each of these conventional devices requires a hydraulic cylinder and a hydraulic source, and in the former band system, the hydraulic cylinder is disposed on the rotating part and the hydraulic source is disposed on the fixed part, so that the steel pipe pile is rotated and stopped. Not only does it require cumbersome operation of connecting and disconnecting the hydraulic cylinder and hydraulic source every time, but it also has the drawback that it is not possible to retighten the chuck band while rotating, and the latter wedge method has a complicated structure. And so on.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to omit a hydraulic device altogether, to eliminate a troublesome operation of connecting and disconnecting a hydraulic cylinder and a hydraulic power source, which has been seen in conventional devices, and to realize a simplified structure.
[0005]
[Means for Solving the Problems]
Therefore, the present invention
A plurality of chuck pieces are interposed between the two to transmit the rotation of the rotary drive shaft to the cylindrical structure fitted thereto,
The cylindrical structure of the rotary drive shaft forms a polygonal peripheral surface, and the rotary drive shaft of each of the chuck pieces has a surface that can abut against one or two adjacent planar portions of the polygon, The cylindrical structure is formed with curved surfaces that can abut against the cylindrical surface of the structure,
Each of the chuck pieces is slightly movable in the radial direction of the rotary drive shaft, and is supported by the rotary drive shaft while being slightly movable in the axial direction by being pushed by a cylindrical structure fitted to the rotary drive shaft. And
Each of the chuck pieces is provided with a cam means for moving the cylindrical structure at the time of the axial movement and performing an initial chuck,
Due to the rotation of the rotary drive shaft, the vertex of the longest diameter of one of the polygonal surface of the rotary drive shaft and the chuck piece surface facing the rotary drive shaft is locked before the middle point of the other shortest diameter in the rotation direction, and the final chuck is rotated. To do
A cylindrical structure chuck device is proposed.
[0006]
The term "fitting of the rotary drive shaft and the cylindrical structure" in the present invention means that the rotary drive shaft is fitted around the inner periphery of the cylindrical structure and that the hollow rotary drive shaft is fitted around the outer periphery of the cylindrical structure. Including.
[0007]
Further, the "cam means" is provided with a cam at one or both of an upper end portion of the chuck piece and a portion corresponding to that of the rotary drive shaft, and corresponds to an intermediate portion of the chuck piece and that of the rotary drive shaft. A cam is provided at one or both of the parts to be moved, a cam is provided at one or both of the lower end of the chuck piece and a part corresponding to that of the rotary drive shaft, and the upper and lower chuck pieces are provided. There are cams provided at one or both of both ends and both corresponding portions of the rotary drive shaft, and various other embodiments.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0008]
【Example】
FIGS. 1, 2, and 3 show examples in which the upper end of a cylindrical pile is fitted to the outer periphery of a rotary drive shaft. In FIG. 1, a rotary drive (1) including a motor (2) and a speed reducer (3) is supported on a leader mast (4) so as to be able to move up and down, and a hexagon protruding downward from a lower end of the drive (1). A rotary drive shaft (6), which in this example is a hexagonal shaft, is concentrically connected to the output shaft (5) of the shaft by fitting a hexagonal socket (7) on the upper end thereof. The upper end portion of a cylindrical pile (8) made of a steel pipe in this example as a cylindrical structure is removably fitted to the outer periphery of the cylindrical pile via a chuck device of the present invention including chuck pieces (9). (10) are connection pins inserted into the output shaft (5) and the socket (7).
[0009]
The structure of the chuck device is as follows. First, as shown in FIGS. 2A and 2B, the rotary drive shaft (6) has a tapered cam surface (11 ') that expands upward on the outer peripheral surface at the upper end of a regular hexagonal shaft main body. A short axis (12) is formed between the inverted frustoconical cam (11) and the socket (7) in succession, and the upper ring (13) is slightly attached to the short axis (12) in the axial direction. A flange-shaped upper holder (14), which is fitted to the ring (13) so as to be slidable at a distance and is spaced from the cam surface (11 ') at an appropriate distance, protrudes downward from the outer peripheral edge of the ring (13). A short cylindrical lower ring (15) is fixed to a lower end portion of the drive shaft (6) by a pin (17), and an outer peripheral edge of the ring (15) is appropriately spaced from an outer surface of the drive shaft (6). A flange-shaped lower holder (16) with an opening is projected upward.
[0010]
In the present embodiment, the chuck pieces (9) are composed of six plate-like bodies corresponding to the hexagonal drive shafts (6), and the drive shafts (6) of the respective pieces (9). The side surface is set to a plane having substantially the same width as each plane portion (6 ') of the hexagonal axis and capable of contacting the flat surface portion (6') almost entirely, and the outer surface of the cylindrical pile (8) is set to the cylindrical shape. A tapered driven surface corresponding to the tapered cam surface (11 ') is formed on the inner surface of the upper end of the chuck piece (9). (9 ') are formed, and a passive flange (18) is protruded from the outer surface of the upper end portion. The flange (18) has a cylindrical pile (8) formed on the outer periphery of the chuck piece (9). When fitted, the pile (8) is pushed up.
[0011]
The above-mentioned chuck pieces (9)... Always drop their lower ends into the holder (16) of the lower ring (15) by their own weight, and lower their upper ends by the weight of the upper ring (13). The tapered driven surface (9 ')... Is located at the lowest position where the tapered driven surface (9') faces the tapered cam surface (11 '). The upper end has a clearance (a) that can be moved in the radial direction (the direction of the cylindrical pile) a little distance from the holder (14), and the lower end has the same clearance (b) between the holder and the holder (16). At the same time, the upper ring (13) is provided with a clearance (c) between the socket (7) and the socket (7) to allow a slight movement in the axial direction.
[0012]
Looking at the relationship between the chuck pieces (9)... With respect to the drive shaft (6) and the cylindrical pile (8), the chuck pieces (9). The inner surface of the piece is brought into non-contact with the inner peripheral surface of the cylindrical pile (8) by bringing the inner surface of the piece into parallel contact with or facing the flat portion (6 ') of the drive shaft (6). The rotation of (6) is not transmitted to the cylindrical pile (8), so that the chuck is released. When the chuck pieces (9) are pushed up and their driven surfaces (9 ') are pushed by the cam surface (11') and slightly move in the radial direction as shown in FIG. Is pressed against the inner peripheral surface of the cylindrical pile (8) to reach the initial chuck. When the drive shaft (6) rotates in this state, the top (P) of the longest outer diameter (L) of the drive shaft (6) becomes the shortest inner diameter of the chuck piece (9) as shown in FIG. (L) Midpoint (Q): Locked at a point in the rotation direction before, to prevent free rotation of the drive shaft (6), and thereby rotate the drive shaft (6) to the cylindrical pile (8). , And each of the chuck pieces (9) is further pushed by a cylindrical pile by an outward pressing force exerted on the chuck pieces (9) from the apex (P) of the drive shaft (6). (8) The chuck is brought into pressure contact with the inner peripheral surface to strengthen the chuck.
[0013]
(19) is an elastic rubber ring fitted on the short shaft (12).
[0014]
The operation of the above example will be described below together with the operation. After each part is in the state of FIG. 2, the rotary drive (1) is raised to the top of the mast (4), and the cylindrical pile (8) to be connected in this state is moved below the drive shaft (6) by a crane. Hang it on. The rotary drive (1) is lowered gradually and its drive shaft (6) is inserted into the upper end of the cylindrical pile (8). When the passive flange (18) of each chuck piece (9) is pushed to the upper end of the cylindrical pile (8) and the entire chuck piece (9) is pushed up, each driven surface (9 ') ... 11 '), the chuck pieces (9) move radially and press against the inner peripheral surface of the cylindrical pile (8), thereby reaching the state of the initial chuck. Then, when the rotary drive shaft (6) is rotated by starting the motor (2), the apex (P) of the drive shaft (6) becomes the middle point of the chuck piece (6) as shown in FIG. (Q)... Each of which is locked at a point in front of it to take the final chuck state, whereby the rotation of the drive shaft (6) is reliably transmitted to the cylindrical pile (8) via the chuck pieces (9). And the chuck condition is strengthened.
[0015]
When the drive shaft (6) is removed from the pile (8) after the cylindrical pile (8) is buried in the ground, the motor (2) is reversely rotated by a small angle by a jogging operation to drive the drive shaft (6). 2 (b) in which the inner planes of the chuck pieces (9)... Face substantially parallel to the plane portions (6 ′) of. Then, when the rotary driving device (1) is pulled up, first, the drive shaft (6) is pulled up only by the clearance (c) from the inside of the chuck pieces (9) which are still pressed against the inner peripheral surface of the cylindrical pile (8). Thereby, each chuck piece (9)... Driven surface (9 ′) is separated from the cam surface (11 ′) and released from the pressure contact with the cylindrical pile (8). Then, when the rotary drive device (1) is further pulled up, the entire drive shaft (6) equipped with the chuck pieces (9)... Is easily pulled out from the cylindrical pile (8).
[0016]
FIG. 4 shows another embodiment in which the upper end of the cylindrical pile (8a) is fitted into the inner cylinder of the hollow rotary drive shaft (6a). Six chuck pieces (9a) are held in a regular hexagonal inner cylinder of the rotary drive shaft (6a), and the chuck pieces (9a)... A curved surface capable of abutting the inner surface of the cylindrical pile (8a) almost entirely to the outer peripheral surface of the pile (8a) on a plane capable of substantially abutting on each one plane portion (6'a) of the inner cylinder. These chuck pieces (9a) are formed by the inner flange-like upper holder (14a) and the inner flange-like lower holder (16a) provided in the inner cylinder of the drive shaft (6a) to form a clearance (a). , (B) and (c) are provided and held so as to be slightly movable in the axial direction and also movable in the radial direction, and the other structures are appropriately designed according to FIGS.
[0017]
In this example, the inner shaft of the drive shaft (6a) is fitted to the upper end of the cylindrical pile (8a), and each chuck piece (9a) is pushed up by the pile (8a) via the passive flange (18a). , Each driven surface (9 ') is pressed by the cam surface (11'), and each chuck piece (9a) moves radially inward and comes into contact with the outer peripheral surface of the pile (8a), and the state of the initial chuck is changed. Leads to. Then, when the drive shaft (6a) is rotated, as shown in FIG. 4 (c), the longest outer diameters (La) and the two vertexes (Pa) and (Pa) of each of the chuck pieces (9a). The final chuck is locked by being locked to the plane point (6'a) adjacent to the shortest inner diameter (la) of the drive shaft (6a), the middle point (Qa) of (6'a), and the point before (Qa). Take the state and strengthen the chuck state.
[0018]
In another embodiment of FIG. 5, six chuck pieces (9b)... Are held in a regular hexagonal inner cylinder of a rotary drive shaft (6b), and the drive shaft (6b) of each chuck piece (9b). The outer surface is a mountain-shaped bent surface which can contact almost half of the adjacent two flat portions (6'b) (6'b) of the hexagonal inner cylinder of the drive shaft, and the cylindrical pile (8b) has an inner surface. Are respectively formed on the curved surface of the scale which abuts the outer peripheral surface of the pile, and the other structure is substantially the same as that of FIG. According to the present example, in the final chuck, the vertex (Pb) of the longest outer diameter (Lb) of each chuck piece (9b)... Is the shortest inner diameter (lb) of the drive shaft (6b) as shown in FIG. In front of the middle point (Qb).
[0019]
The fitting peripheral surface of the rotary drive shaft to the cylindrical pile in the present invention is a polygon such as a square, a pentagon, or a hexagon, but may be formed into an ellipse.
[0020]
【The invention's effect】
According to the cylindrical structure chuck device of the present invention, it is possible to omit not only the hydraulic device used in the conventional chuck device but also any other power device, thereby realizing the miniaturization and simplification of the entire device. In operation, the chucking state can be automatically set by rotating the rotary drive shaft, and the cumbersome operation of moving the hydraulic cylinder and hydraulic power source away from the conventional device can be eliminated. Thus, the operation can be streamlined and simplified.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of a chuck device of the present invention connected to a rotary drive device.
FIG. 2 (a) is a partially cutaway enlarged front view of a chuck device portion.
(B) It is an AA sectional view taken on the line of (a).
FIG. 3 (a) is a partially cutaway enlarged front view of a chuck state of a chuck device portion.
FIG. 3B is a cross-sectional view taken along the line BB of FIG.
FIG. 4 (a) is an enlarged vertical sectional front view of another embodiment.
(B) It is CC sectional view taken on the line of (A).
(C) FIG.
FIG. 5 (a) is a cross-sectional view taken along the same cross section as FIG. 4 (b) of still another embodiment.
(B) It is a sectional view of the same in a chuck state.
[Explanation of symbols]
1 Rotary drive device 6, 6a, 6b Rotary drive shaft 6 ', 6'a, 6'b Rotary drive shaft flat portion 8, 8a, 8b Cylindrical pile 9, 9a, 9b Chuck piece 11, 11a Cam 11', 11'a Cam surface 14, 14a Upper holder 16, 16a Lower holder 18, 18a Passive flange

Claims

A plurality of chuck pieces are interposed between the two to transmit the rotation of the rotary drive shaft to the cylindrical structure fitted thereto,
The cylindrical structure of the rotary drive shaft forms a polygonal peripheral surface, and the rotary drive shaft of each of the chuck pieces has a surface that can abut against one or two adjacent planar portions of the polygon, The cylindrical structure is formed with curved surfaces that can abut against the cylindrical surface of the structure,
Each of the chuck pieces is slightly movable in the radial direction of the rotary drive shaft, and is supported by the rotary drive shaft while being slightly movable in the axial direction by being pushed by a cylindrical structure fitted to the rotary drive shaft. And
Each of the chuck pieces is provided with a cam means for moving the cylindrical structure at the time of the axial movement and performing an initial chuck,
Due to the rotation of the rotary drive shaft, the vertex of the longest diameter of one of the polygonal surface of the rotary drive shaft and the chuck piece surface facing the rotary drive shaft is locked before the middle point of the other shortest diameter in the rotation direction, and the final chuck is rotated. To do
A cylindrical structure chuck device.