JPS6337179Y2 - - Google Patents

Info

Publication number
JPS6337179Y2
JPS6337179Y2 JP1983110386U JP11038683U JPS6337179Y2 JP S6337179 Y2 JPS6337179 Y2 JP S6337179Y2 JP 1983110386 U JP1983110386 U JP 1983110386U JP 11038683 U JP11038683 U JP 11038683U JP S6337179 Y2 JPS6337179 Y2 JP S6337179Y2
Authority
JP
Japan
Prior art keywords
drill
drill bit
key
holder
drill holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP1983110386U
Other languages
Japanese (ja)
Other versions
JPS6018188U (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP11038683U priority Critical patent/JPS6018188U/en
Publication of JPS6018188U publication Critical patent/JPS6018188U/en
Application granted granted Critical
Publication of JPS6337179Y2 publication Critical patent/JPS6337179Y2/ja
Granted legal-status Critical Current

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Landscapes

  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Description

【考案の詳細な説明】 この考案はドリルビツトの打撃動作と回転動作
とによつて穿孔加工を行うように構成されたハン
マードリルにおいて、ドリルビツトを回転駆動可
能に支持するための支持装置に関するもので、そ
の目的はドリルビツトを確実に把持してドリルビ
ツトへの回転伝達効果を高めうるハンマードリル
におけるドリルビツトの支持装置を提供すること
である。
[Detailed Description of the Invention] This invention relates to a support device for rotatably supporting a drill bit in a hammer drill configured to perform drilling operations by the striking and rotational movements of the drill bit. The object is to provide a support device for a drill bit in a hammer drill that can securely grip the drill bit and enhance the effect of transmitting rotation to the drill bit.

以下、本考案の一実施例を図面に従つて説明す
る。
An embodiment of the present invention will be described below with reference to the drawings.

ハンマードリルの本体Hに可転支持されたほぼ
円筒状のドリルホルダ1は本体Hに内装された図
示しない駆動機構を介して回転駆動され、その先
端付近はこのドリルホルダ1の軸孔1a内に挿脱
されかつ軸孔1aに嵌挿された図示しない叩打部
材で打撃動作のために前後方向に往復動されるド
リルビツト2を支持するために本体Hの前方に突
出されている。
A substantially cylindrical drill holder 1 rotatably supported by the body H of the hammer drill is rotationally driven via a drive mechanism (not shown) built into the body H, and the vicinity of its tip is inserted into the shaft hole 1a of the drill holder 1. It projects forward of the main body H to support the drill bit 2, which is reciprocated in the front and back direction for a striking action with a striking member (not shown) that is inserted and removed and inserted into the shaft hole 1a.

ドリルホルダ1の突出部の中央部付近に対し相
対向状に開設された1対のキー孔4,4はドリル
ビツト2の基端部付近に対し軸方向に沿つて凹設
されて前後端に凹曲面状の端面3a,3aをもつ
1対のキー溝3,3と同幅で、側断面がそれぞれ
内方に向つて先細状のほぼ台形状で、それぞれ軸
方向に沿つて長孔状に形成され、かつ、このキー
孔4の一側にはこの一側の外周付近が凹欠されて
それぞれ掛止部5,5が回転対称状に形成され、
この両掛止部5に対向するキー孔4の他側面がそ
れぞれ押圧面4a,4aとなる。
A pair of key holes 4, 4, which are opened opposite to each other near the center of the protrusion of the drill holder 1, are recessed along the axial direction near the base end of the drill bit 2, and are recessed at the front and rear ends. It has the same width as a pair of key grooves 3, 3 having curved end surfaces 3a, 3a, and has a substantially trapezoidal side cross section tapering inward, and is formed in the shape of a long hole along the axial direction. Further, on one side of the key hole 4, a recess is formed near the outer periphery of the one side, and hook portions 5, 5 are formed in a rotationally symmetrical manner, respectively.
The other side surfaces of the keyhole 4 facing both the hooking portions 5 serve as pressing surfaces 4a, 4a, respectively.

ドリルホルダ1の先端部付近に凹設された位置
決め孔6〜6はそれぞれドリルホルダ1の外周面
に対しその円周を4等分する位置に配置されてい
る。
The positioning holes 6 to 6 recessed near the tip of the drill holder 1 are respectively arranged at positions dividing the circumference of the outer peripheral surface of the drill holder 1 into four equal parts.

ドリルホルダ1の両キー孔4内に対しそれぞれ
ドリルホルダ1の半径方向への移動可能でほぼ密
嵌状に嵌装されたキー7,7は軸孔1a内への脱
落を規制するために側面がキー孔4に近似したほ
ぼ台形状で、その内端部7aが軸孔1a内に突出
されるように形成されていて、ドリルビツト2を
軸孔1a内に挿入したときには両キー7の内端部
7aがそれぞれドリルビツト2のキー溝3内に係
入され、ドリルビツト2がドリルホルダ1に対し
共転可能に支持される。そして、両キー7の内端
部7aはそれぞれ両キー溝3内に対し両端面3a
との間には遊隙が形成されてドリルビツト2の前
後方向への遊動が許容されるように嵌合され、ド
リルビツト2に回転動作と打撃動作とを伝達する
ことができる。
Keys 7, 7, which are movable in the radial direction of the drill holder 1 and are fitted into both key holes 4 of the drill holder 1 in an almost tight fit, are attached to the side surfaces to prevent them from falling into the shaft hole 1a. has a substantially trapezoidal shape similar to the key hole 4, and is formed such that its inner end 7a protrudes into the shaft hole 1a, and when the drill bit 2 is inserted into the shaft hole 1a, the inner ends of both keys 7 The portions 7a are respectively engaged in the key grooves 3 of the drill bit 2, and the drill bit 2 is supported for rotation with the drill holder 1. The inner end portions 7a of both keys 7 are located at both end surfaces 3a with respect to the inside of both key grooves 3, respectively.
The drill bit 2 is fitted in such a manner that a clearance is formed between the drill bit 2 and the drill bit 2 to allow the drill bit 2 to move back and forth, thereby transmitting rotational motion and striking motion to the drill bit 2.

両キー7の一側面にそれぞれ突設された正面ほ
ぼ三日月型状の突片7b,7bはキー7がドリル
ビツト2の挿脱時にキー孔4内で傾動したときに
軸孔1a内へのキー7の脱落を規制してキー7の
嵌装姿勢を保持するためにドリルホルダ1の両掛
止部5に対しそれぞれ当接可能に対置されてい
る。
Protrusions 7b, 7b, which are approximately crescent-shaped in the front and are provided on one side of both keys 7, respectively, prevent the key 7 from moving into the shaft hole 1a when the key 7 tilts within the key hole 4 when inserting or removing the drill bit 2. In order to prevent the key 7 from falling off and to maintain the fitted position of the key 7, the two locking parts 5 are disposed opposite to each other so as to be able to come into contact with both hooking parts 5 of the drill holder 1.

ほぼ円筒状のチエンジリング8はドリルホルダ
1に対し摺転可能に外嵌され、その先端部付近に
対しドリルホルダ1の位置決め孔6に対向して貫
設された通孔8a内にはリング状のスプリング9
で内方に付勢された球状のロツク部材10が各位
置決め孔6との係脱可能に嵌合され、一方、チエ
ンジリング8の内周面にはドリルビツト2をドリ
ルホルダ1の軸孔1a内に挿脱するときにキー溝
3内から脱離されるキー7の半径方向への移動を
許容するために逃げ部8b,8bが相対向状に凹
設されていて、チエンジリング8を90゜ずつ回動
してロツク部材10を各位置決め孔6に係合した
ときにはチエンジリング8を両逃げ部8bが両キ
ー7にそれぞれ対向する位置(第4図参照)、若
しくは、両逃げ部8bが両キー7に対して90゜回
転した位置(第3図参照)で選択的にロツクする
ことができ、両逃げ部8bを両キー7から退避さ
せたときには両キー7をチエンジリング8とドリ
ルビツト2の両キー溝3との間で挾持する一方、
両逃げ部8bを両キー7に対向させたときにはド
リルビツト2をドリルホルダ1の軸孔1aに挿脱
することができる。
A substantially cylindrical chain ring 8 is slidably fitted onto the outside of the drill holder 1, and a ring-shaped chain ring 8 is inserted into a through hole 8a that is penetrated near the tip of the chain ring 8, facing the positioning hole 6 of the drill holder 1. spring 9
A spherical lock member 10 biased inwardly is removably fitted into each positioning hole 6, while a drill bit 2 is inserted into the shaft hole 1a of the drill holder 1 on the inner peripheral surface of the change ring 8. In order to allow the key 7 to move in the radial direction when it is inserted or removed from the keyway 3, relief parts 8b, 8b are recessed to face each other, and the change ring 8 is rotated 90 degrees at a time. When the lock member 10 is rotated and engaged with each positioning hole 6, the change ring 8 is moved to a position where both relief portions 8b are opposite to both keys 7 (see Fig. 4), or both relief portions 8b are positioned opposite to both keys 7. It can be selectively locked at a position rotated by 90 degrees with respect to 7 (see Fig. 3), and when both relief parts 8b are retracted from both keys 7, both keys 7 are locked between both change ring 8 and drill bit 2. While being held between the key groove 3,
When both escape portions 8b are opposed to both keys 7, the drill bit 2 can be inserted into and removed from the shaft hole 1a of the drill holder 1.

チエンジリング8に外嵌されたカバー部材11
はゴム材等でほぼ溝付き円筒状に形成されてい
る。
Cover member 11 fitted onto change ring 8
is formed of a rubber material or the like into a substantially grooved cylindrical shape.

続いて、上記した構成をもつ実施例の作用と効
果を説明する。
Next, the operation and effects of the embodiment having the above configuration will be explained.

さて、本例ではドリルホルダ1にはドリルビツ
ト2のキー溝3と同幅をもつ1対のキー孔4を開
設し、両キー孔4内にはドリルホルダ1の回転を
ドリルビツト2に伝達するためにキー溝3内に内
端部7aが係入される1対のキー7をドリルホル
ダ1の半径方向への移動可能でキー溝3との係脱
可能に嵌装するとともに、ドリルホルダ1には前
記半径方向へのキー7の移動を許容する逃げ部8
bが内周面に凹設されたチエンジリング8を回動
操作可能に外嵌してある。
Now, in this example, a pair of keyholes 4 having the same width as the keyway 3 of the drill bit 2 are provided in the drill holder 1, and in both keyholes 4 there are holes for transmitting the rotation of the drill holder 1 to the drill bit 2. A pair of keys 7 whose inner ends 7a are inserted into the keyway 3 are fitted so as to be movable in the radial direction of the drill holder 1 and detachable from the keyway 3. is a relief portion 8 that allows movement of the key 7 in the radial direction.
A change ring 8, which is recessed in the inner circumferential surface, is rotatably fitted onto the outside.

このため、チエンジリング8を回動操作するだ
けでドリルビツト2をドリルホルダ1に係止した
状態と、ドリルホルダ1へのドリルビツト2の着
脱が可能な状態とに容易に変換することができ、
ドリルホルダ1へのドリルビツト2の着脱操作を
簡便化及び円滑化しうる効果を有する。
Therefore, by simply rotating the change ring 8, it is possible to easily change the state in which the drill bit 2 is locked to the drill holder 1 and the state in which the drill bit 2 can be attached to and removed from the drill holder 1.
This has the effect of simplifying and smoothing the operation of attaching and detaching the drill bit 2 to the drill holder 1.

また、ドリルホルダ1の軸孔1a内にドリルビ
ツト2を挿入したときにはドリルビツト2が両キ
ー7を介してドリルホルダ1に対し確実かつ安定
に支持されるとともにドリルホルダ1の回転をド
リルビツト2に対し両キー7を介して確実に伝達
することができる。
Furthermore, when the drill bit 2 is inserted into the shaft hole 1a of the drill holder 1, the drill bit 2 is reliably and stably supported to the drill holder 1 via both keys 7, and the rotation of the drill holder 1 is controlled in both directions relative to the drill bit 2. The information can be reliably transmitted via the key 7.

とくに、ドリルホルダ1の回転トルクがキー孔
4の押圧面4aを介してキー7に伝達され、さら
に、キー7の側面とキー溝3の側面とを介してド
リルビツト2に伝達され、それぞれ押圧方向と直
交しかつ密着状に面接触される押圧面と受圧面と
を介して伝達されるため、回転伝達時の押圧力の
局部的集中化や押圧方向の不適正等に起因する部
材間の喰い込みやタツキを排除してドリルビツト
2に対する回転伝達効果を著しく高めうる効果が
ある。
In particular, the rotational torque of the drill holder 1 is transmitted to the key 7 via the pressing surface 4a of the key hole 4, and is further transmitted to the drill bit 2 via the side surface of the key 7 and the side surface of the keyway 3, so that the rotational torque of the drill holder 1 is transmitted in the pressing direction. Because the rotation is transmitted through a pressing surface and a pressure receiving surface that are perpendicular to each other and in close surface contact with each other, there is no possibility of bite between the members due to local concentration of pressing force during rotation transmission or improper pressing direction. This has the effect of significantly increasing the effect of transmitting rotation to the drill bit 2 by eliminating jamming and twisting.

すなわち、本考案はハンマードリルの本体に可
転支持されたほぼ円筒状のドリルホルダにはこの
ドリルホルダの軸孔に挿脱されるドリルビツトに
凹設されたキー溝と同幅をもつキー孔を開設し、
このキー孔内には前記ドリルホルダの回転を前記
ドリルビツトに伝達するために前記キー孔を貫通
して前記キー溝内に係入されるキーを前記ドリル
ホルダの半径方向への移動可能で前記キー溝との
係脱可能に嵌装するとともに、前記ドリルホルダ
には前記半径方向への前記キーの移動を許容する
逃げ部が内周面に凹設されたチエンジリングを回
動操作可能に外嵌したことによつて、チエンジリ
ングを回動操作するだけでドリルビツトをドリル
ホルダに係止した状態と、ドリルホルダへのドリ
ルビツトの着脱が可能な状態とに容易に変換する
ことができ、ドリルホルダへのドリルビツトの着
脱操作を簡便化及び円滑化しうる効果を有する。
That is, in the present invention, a substantially cylindrical drill holder rotatably supported by the body of a hammer drill is provided with a keyhole having the same width as the keyway formed in the drill bit that is inserted into and removed from the shaft hole of the drill holder. established,
A key is inserted into the key hole and is movable in the radial direction of the drill holder. A change ring is fitted to the drill holder so as to be removable from the groove, and a change ring is rotatably fitted to the drill holder, and the drill ring has a relief part recessed in the inner peripheral surface to allow movement of the key in the radial direction. By rotating the change ring, it is possible to easily change the state in which the drill bit is locked to the drill holder and the state in which the drill bit can be attached to and removed from the drill holder. This has the effect of simplifying and smoothing the operation of attaching and detaching the drill bit.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本考案の一実施例を示すもので、第1図
は支持装置の側断面図、第2図は同じくドリルビ
ツトの挿脱途中の状態を示す側断面図、第3図は
第1図のX−X線断面図、第4図は第2図のY−
Y線断面図、第5図は第1図のZ−Z線断面図で
ある。 1……ドリルホルダ、1a……軸孔、2……ド
リルビツト、3……キー溝、4……キー孔、7…
…キー、8……チエンジリング。
The drawings show one embodiment of the present invention; FIG. 1 is a side sectional view of the support device, FIG. XX cross-sectional view, Figure 4 is Y- in Figure 2.
FIG. 5 is a sectional view taken along the Z--Z line in FIG. 1. 1... Drill holder, 1a... Shaft hole, 2... Drill bit, 3... Keyway, 4... Key hole, 7...
...Key, 8...Change ring.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ハンマードリルの本体に可転支持されたほぼ円
筒状のドリルホルダにはこのドリルホルダの軸孔
に挿脱されるドリルビツトに凹設されたキー溝と
同幅をもつキー孔を開設し、このキー孔内には前
記ドリルホルダの回転を前記ドリルビツトに伝達
するためのキーを前記ドリルホルダの半径方向へ
の移動可能で前記キー溝との係脱可能に嵌装する
とともに、前記ドリルホルダには前記半径方向へ
の前記キーの移動を許容する逃げ部が内周面に凹
設されたチエンジリングを回動操作可能に外嵌し
たことを特徴とするハンマードリルにおけるドリ
ルビツトの支持装置。
A nearly cylindrical drill holder rotatably supported by the body of the hammer drill has a keyhole with the same width as the keyway in the drill bit that is inserted into and removed from the shaft hole of the drill holder. A key for transmitting the rotation of the drill holder to the drill bit is fitted in the hole so as to be movable in the radial direction of the drill holder and engageable with and detachable from the key groove, and 1. A support device for a drill bit in a hammer drill, characterized in that a change ring having an inner circumference recessed with a recess for allowing movement of the key in a radial direction is rotatably fitted onto the outside.
JP11038683U 1983-07-15 1983-07-15 Support device for drill bit in hammer drill Granted JPS6018188U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11038683U JPS6018188U (en) 1983-07-15 1983-07-15 Support device for drill bit in hammer drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11038683U JPS6018188U (en) 1983-07-15 1983-07-15 Support device for drill bit in hammer drill

Publications (2)

Publication Number Publication Date
JPS6018188U JPS6018188U (en) 1985-02-07
JPS6337179Y2 true JPS6337179Y2 (en) 1988-10-03

Family

ID=30256739

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11038683U Granted JPS6018188U (en) 1983-07-15 1983-07-15 Support device for drill bit in hammer drill

Country Status (1)

Country Link
JP (1) JPS6018188U (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866638A (en) * 1981-07-24 1983-04-20 デユロフアツク・カルトロ・アクチセルスカベツト Tool shaft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866638A (en) * 1981-07-24 1983-04-20 デユロフアツク・カルトロ・アクチセルスカベツト Tool shaft

Also Published As

Publication number Publication date
JPS6018188U (en) 1985-02-07

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