IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0925390
(2010-10-20)
|
등록번호 |
US-8721333
(2014-05-13)
|
우선권정보 |
JP-2009-249983 (2009-10-30) |
발명자
/ 주소 |
- Takashi, Tetsuya
- Nakayama, Shozo
|
출원인 / 주소 |
- J. Morita Manufacturing Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
0 |
초록
▼
An air-driven rotary cutting tool including a grip part, a head part provided at a distal end of the grip portion, and a rotor of double-wheel type rotatably installed in a hollow portion formed in the head part. The rotor has a first turbine blade portion provided with a plurality of first turbine
An air-driven rotary cutting tool including a grip part, a head part provided at a distal end of the grip portion, and a rotor of double-wheel type rotatably installed in a hollow portion formed in the head part. The rotor has a first turbine blade portion provided with a plurality of first turbine vanes surrounding the rotary axis and a second turbine blade portion integrally formed with the first turbine blade and having a plurality of second turbine vanes surrounding the rotary axis. The first turbine vane has, on its side when seen in a direction into the rotary axis, a concave shape concaved in a direction of rotation of the rotor, and the second turbine vane has, on its side, a concave shape concaving in a direction opposite from the first turbine vane.
대표청구항
▼
1. An air-driven rotary cutting tool comprising: a grip part adapted to be held by an operator;a head part provided at a distal end of said grip part; anda rotor provided in a hollow portion formed in said head part with a bearing in between said rotor and said head part, said rotor being rotatable
1. An air-driven rotary cutting tool comprising: a grip part adapted to be held by an operator;a head part provided at a distal end of said grip part; anda rotor provided in a hollow portion formed in said head part with a bearing in between said rotor and said head part, said rotor being rotatable around a rotary axis thereof:said rotor comprising a first turbine blade portion provided with a plurality of first turbine vanes surrounding said rotary axis and a second turbine blade portion integrally formed with said first turbine blade portion and having a plurality of second turbine vanes surrounding said rotary axis;said head part including in said hollow portion an air supply port for emitting air into said first turbine blade portion of said rotor from an air supply passage provided at said grip part, a guide portion for guiding air from said first turbine blade portion into said second turbine blade portion, and an exhaust port for exhausting air from said second turbine blade portion to an exhaust passage provided at said grip part; andair emitted from said air supply port blowing into a first air channel provided between said first turbine vanes and activating said first turbine blade portion from a substantially perpendicular direction relative to said rotary axis of said rotor to rotate said rotor around an axial center of said rotary axis and being exhausted from said first air channel of said first turbine blade portion along an axial direction of said rotary axis, the air further being guided by a second air channel provided at said guide portion into a third air channel provided between said second turbine vanes of said second turbine blade portion, the air thus guided into said third air channel of said second turbine blade portion activating said second turbine blade portion in a direction substantially perpendicular to said rotary axis to further promote rotation of said rotor, and then the air being exhausted from said third air channel and into said exhaust port; whereineach of said plurality of first turbine vanes has such a concave shape on a side thereof seen in a direction into said rotary axis as to be concaved from an upstream side into a downstream side in a rotational direction of said rotor, while each of said second turbine vanes has such a concave shape on a side thereof as to fall be concaved into an opposite direction from said first turbine vanes. 2. The air-driven rotary cutting tool as set forth in claim 1, wherein: said second air channel comprises a plurality of concave spaces defined by: a plurality of wall portions, which are formed on an inner circumference of said hollow portion of said head part and are parallel to said rotary axis, anda bottom wall portion, which is formed between said plurality of wall portions and across planes parallel to said rotary axis; andeach of said plurality of concave spaces is defined by: a first face constituting a surface of said bottom wall portion,a second face comprised of a curved surface continuously erecting from a centrifugal side of said first face relative to said rotary axis, anda third face and a fourth face constituting inner surfaces on a bottom wall portion side of said wall portions disposed at both sides of said bottom wall portion. 3. The air-driven rotary cutting tool as set forth in claim 2, wherein said bottom wall portion is directed from said axial center of said rotary axis in a radial direction. 4. The air-driven rotary cutting tool as set forth in claim 2, wherein said bottom wall portion is obliquely directed, with respect to a radial direction from said axial center of said rotary axis, so as to be centrifugal into said downstream side of said rotational direction of said rotor. 5. The air-driven rotary cutting tool as set forth in any one of claims 2 to 4, wherein connecting portions of said first and second faces and of said third and fourth faces are continuously formed with a curved surface. 6. The air-driven rotary cutting tool as set forth in claim 5, wherein said third face provided on an upstream side in said rotational direction of said rotor is formed with a fifth face slanted toward said bottom wall portion and formed by cutting out an opening side of said concave space. 7. An air-driven rotary cutting tool comprising: a grip part adapted to be held by an operator;a head part provided at a distal end of said grip part; anda rotor provided in a hollow portion formed in said head part with a bearing in between said rotor and said head part, said rotor being rotatable around a rotary axis thereof:said rotor comprising a first turbine blade portion provided with a plurality of first turbine vanes surrounding said rotary axis and a second turbine blade portion integrally formed with said first turbine blade portion and having a plurality of second turbine vanes surrounding said rotary axis;said head part including in said hollow portion an air supply port for emitting air into said first turbine blade portion of said rotor from an air supply passage provided at said grip part, a guide portion for guiding air from said first turbine blade portion into said second turbine blade portion, and an exhaust port for exhausting air from said second turbine blade portion to an exhaust passage provided at said grip part; andair emitted from said air supply port blowing into a first air channel provided between said first turbine vanes and activating said first turbine blade portion from a substantially perpendicular direction relative to said rotary axis of said rotor to rotate said rotor around an axial center of said rotary axis and being exhausted from said first air channel of said first turbine blade portion along an axial direction of said rotary axis, the air further being guided by a second air channel provided at said guide portion into a third air channel provided between said second turbine vanes of said second turbine blade portion, the air thus guided into said third air channel of said second turbine blade portion activating said second turbine blade portion in a direction substantially perpendicular to said rotary axis to further promote rotation of said rotor, and then the air being exhausted from said third air channel and into said exhaust port; whereinsaid second air channel comprises a plurality of concave spaces defined by: a plurality of wall portions, which are formed on an inner circumference of said hollow portion of said head part and are parallel to said rotary axis; anda bottom wall portion, which is formed between said plurality of wall portions and across planes parallel to said rotary axis,each of said plurality of concave spaces is defined by: a first face constituting a surface of said bottom wall portion;a second face comprised of a curved surface continuously erecting from a centrifugal side of said first face relative to said rotary axis; anda third face and a fourth face constituting inner surfaces on a bottom wall portion side of said wall portions disposed at both sides of said bottom wall portion, andsaid third face provided on an upstream side in said rotational direction of said rotor is formed with a fifth surface slanted toward said bottom wall portion and formed by cutting out an opening side of said concave space. 8. The air-driven rotary cutting tool as set forth claim 7, wherein an area where said second air channel is provided is, with respect to a circumferential direction around said rotary axis, larger than an area where said air supply port is provided. 9. The air-driven rotary cutting tool as set forth in claim 8, wherein said area where said second air channel is provided is, with respect to a circumferential direction around said rotary axis, formed in an entire peripheral area of said circumferential direction of said rotary axis except for an area close to said exhaust port. 10. The air-driven rotary cutting tool as set forth in claim 7, wherein: there are a plurality of second air channels, and an area where said second air channels are provided is divided into a plurality of areas, andeach first face of that is included in each of said plurality of areas is disposed at a different angle with respect to a radial direction of said rotary axis. 11. The air-driven rotary cutting tool as set forth in claim 10, wherein a tangential angle formed between a center line of said first face included in said each of said plurality of areas and a tangential line where the center line crosses an inner circumference of said hollow portion becomes smaller toward said downstream side in said rotational direction of said rotor. 12. The air-driven rotary cutting tool as set forth in claim 11, wherein: said rotor has a ring-like hub comprising two ring portions which are of different diameters and concentric therewith; andsaid first turbine blade portion is provided on an outer circumference of one of said two ring portions, while said second turbine blade portion is provided on an outer circumference of another one of said two ring portions, said one of said two ring portions being greater in diameter than said another one of said two ring portions.
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