IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0788387
(2004-03-01)
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우선권정보 |
JP-P2003-075338(2003-03-19); JP-P2003-114010(2003-04-18); JP-P2003-398611(2003-11-28) |
발명자
/ 주소 |
- Ohmori,Yasuki
- Sasaki,Yasuo
- Fujisawa,Haruhisa
|
출원인 / 주소 |
|
대리인 / 주소 |
Antonelli, Terry, Stout and Kraus, LLP
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인용정보 |
피인용 횟수 :
13 인용 특허 :
7 |
초록
▼
A combustion type power tool capable of avoiding damage to seal members and a housing to prolong a service life, and capable of enhancing operability and workability. Temperature elevation of a combustion chamber frame due to combustion of a mixture of combustible gas and air is detected by a temper
A combustion type power tool capable of avoiding damage to seal members and a housing to prolong a service life, and capable of enhancing operability and workability. Temperature elevation of a combustion chamber frame due to combustion of a mixture of combustible gas and air is detected by a temperature sensor disposed in a housing. If the detected temperature exceeds a preset temperature, ignition of an ignition plug is prohibited by a prohibiting unit in spite of ON operation of a trigger switch. In this state, alarming is performed by a display to notify the user of the inoperable state of the tool. Similar control can be made when the temperature sensor is disposed at a cylinder, an exhaust cover and the housing.
대표청구항
▼
What is claimed is: 1. A combustion-type power tool comprising: a housing having an inside, one end, and a lower side; a handle extending from the housing and provided with a trigger switch; a head section closing the one end of the housing and formed with a combustible gas passage; a motor attache
What is claimed is: 1. A combustion-type power tool comprising: a housing having an inside, one end, and a lower side; a handle extending from the housing and provided with a trigger switch; a head section closing the one end of the housing and formed with a combustible gas passage; a motor attached to the head section; a push lever provided to the lower side of the housing and movable upon pushing onto a workpiece; a cylinder secured to the inside of the housing and formed with an exhaust hole; a piston slidably disposed in the cylinder and reciprocally movable in an axial direction of the cylinder; a combustion-chamber frame provided in the housing and guidedly movable along the cylinder, the combustion-chamber frame having one end abuttable on and separable from the head section in interlocking relation to the movement of the push lever, a combination of the head section, the cylinder, the piston and the combustion-chamber frame defining a combustion chamber; a driver blade extending from the piston toward a side opposite to the combustion chamber; seal portions providing sealing relations between the combustion chamber frame and the head section and between the combustion chamber frame and the cylinder when the combustion chamber frame is brought into abutment with the head section; a fan rotatably positioned in the combustion chamber and connected to the motor; an ignition plug exposed to the combustion chamber for igniting a mixture of air and the combustible gas in the combustion chamber in response to operation of one of the trigger switch and the head switch; an exhaust check valve selectively opening the exhaust hole, the combustible gas being supplied into the combustion chamber through a combustible gas passage, and being explodingly combusted upon ignition of the ignition plug for moving the piston; a temperature detecting unit detecting a temperature associated with one of the housing and the handle; and an avoiding unit that avoids overheating to one of the housing, the handle, and components in the housing, the avoiding unit being connected to the temperature detecting unit for controlling operation of one of the ignition plug and the fan based on a temperature detected by the temperature detecting unit. 2. The combustion-type power tool as claimed in claim 1, wherein the avoiding unit comprises prohibiting means that prohibits ignition of the ignition plug when the temperature detected by the temperature detecting unit exceeds a predetermined temperature. 3. The combustion-type power tool as claimed in claim 2, wherein the temperature detecting unit is disposed at the combustion chamber frame. 4. The combustion-type power tool as claimed in claim 2, wherein the temperature detecting unit is disposed at the cylinder. 5. The combustion-type power tool as claimed in claim 2, wherein one of the components in the housing comprises an exhaust cover covering the exhaust check valve for changing a exhausting direction into an axial direction of the housing, the temperature detecting unit being disposed at the exhaust cover. 6. The combustion-type power tool as claimed in claim 2, wherein the temperature detecting unit is disposed at a wall of the housing. 7. The combustion-type power tool as claimed in claim 2, further comprising alarm means disposed at one of the housing and the handle for alarming that the temperature detected by the temperature detecting unit exceeds the predetermined temperature. 8. The combustion-type power tool as claimed in claim 1, wherein the avoiding unit controls operation of the fan based upon the temperature detected by the temperature detecting unit. 9. The combustion-type power tool as claimed in claim 1, wherein the avoiding unit controls operation of the ignition plug based on the temperature detected by the temperature detecting unit. 10. The combustion-type power tool as claimed in claim 1, wherein the avoiding unit controls operation of one of the ignition plug and the fan based on the temperature detected by the temperature detecting unit so as to at least avoid thermal damage to the seal portions. 11. The combustion-type power tool, comprising: a housing having an inside, one end, and a lower side; a handle extending from the housing and provided with a trigger switch; a head section closing the one end of the housing and formed with a combustible gas passage; a motor attached to the head section; a push lever provided to the lower side of the housing and movable upon pushing onto a workpiece; a cylinder secured to the inside of the housing and formed with an exhaust hole; a piston slidably disposed in the cylinder and reciprocally movable in an axial direction of the cylinder; a combustion-chamber frame provided in the housing and guidedly movable along the cylinder, the combustion-chamber frame having one end abuttable on and separable from the head section in interlocking relation to the movement of the push lever, a combination of the head section, the cylinder, the piston and the combustion-chamber frame defining a combustion chamber; a driver blade extending from the piston toward a side opposite to the combustion chamber; seal portions providing sealing relations between the combustion chamber frame and the head section and between the combustion chamber frame and the cylinder when the combustion chamber frame is brought into abutment with the head section; a fan rotatably positioned in the combustion chamber and connected to the motor; an ignition plug exposed to the combustion chamber for igniting a mixture of air and the combustible gas in the combustion chamber in response to operation of one of the trigger switch and the head switch; an exhaust check valve selectively opening the exhaust hole, the combustible gas being supplied into the combustion chamber through a combustible gas passage, and being explodingly combusted upon ignition of the ignition plug for moving the piston; a temperature detecting unit detecting a temperature associated with one of the housing and the handle; and an avoiding unit that avoids overheating to one of the housing, the handle, and components in the housing, the avoiding unit being connected to the temperature detecting unit for controlling operation of one of the ignition plug and the fan based on a temperature detected by the temperature detecting unit; wherein the avoiding unit comprises prohibiting means that prohibits ignition of the ignition plug when the temperature detected by the temperature detecting unit exceeds a predetermined temperature; and wherein the avoiding unit further comprises a cooling control unit that controls rotation of the motor when the temperature detected by the temperature detecting unit exceeds the predetermined temperature so as to rotate the fan until the temperature detected by the detecting unit becomes not more than the predetermined temperature. 12. The combustion-type power tool comprising: a housing having an inside, one end, and a lower side; a handle extending from the housing and provided with a trigger switch; a head section closing the one end of the housing and formed with a combustible gas passage; a motor attached to the head section; a push lever provided to the lower side of the housing and movable upon pushing onto a workpiece; a cylinder secured to the inside of the housing and formed with an exhaust hole; a piston slidably disposed in the cylinder and reciprocally movable in an axial direction of the cylinder; a combustion-chamber frame provided in the housing and guidedly movable along the cylinder, the combustion-chamber frame having one end abuttable on and separable from the head section in interlocking relation to the movement of the push lever, a combination of the head section, the cylinder, the piston and the combustion-chamber frame defining a combustion chamber; a driver blade extending from the piston toward a side opposite to the combustion chamber; seal portions providing sealing relations between the combustion chamber frame and the head section and between the combustion chamber frame and the cylinder when the combustion chamber frame is brought into abutment with the head section; a fan rotatably positioned in the combustion chamber and connected to the motor; an ignition plug exposed to the combustion chamber for igniting a mixture of air and the combustible gas in the combustion chamber in response to operation of one of the trigger switch and the head switch; an exhaust check valve selectively opening the exhaust hole, the combustible gas being supplied into the combustion chamber through a combustible gas passage, and being explodingly combusted upon ignition of the ignition plug for moving the piston; a temperature detecting unit detecting a temperature associated with one of the housing and the handle; and an avoiding unit that avoids overheating to one of the housing, the handle, and components in the housing, the avoiding unit being connected to the temperature detecting unit for controlling operation of one of the ignition plug and the fan based on a temperature detected by the temperature detecting unit; and wherein the avoiding unit comprises prohibiting means that prohibits ignition of the ignition plug when the temperature detected by the temperature detecting unit exceeds a predetermined temperature; and wherein the avoiding unit comprises a cooling control unit that controls rotation of the motor when the temperature detected by the temperature detecting unit exceeds the predetermined temperature so as to rotate the fan until the temperature detected by the detecting unit becomes not more than the predetermined temperature. 13. The combustion-type power tool as claimed in claim 12, wherein the cooling control unit comprises a fan rotation continuing unit that continues rotation of the fan until the temperature detected by the detecting unit becomes not more than the predetermined temperature. 14. The combustion-type power tool as claimed in claim 12, wherein the cooling control unit comprises a fan rotation speed controller that controls rotation speed of the fan to a first rotation speed when the temperature detected by the detecting unit is not more than the predetermined temperature, and to a second rotation speed higher than the first rotation speed when the temperature detected by the detecting unit exceeds the predetermined temperature, the fan rotation speed controller maintaining the second rotation speed until the temperature detected by the detecting unit becomes not more than the predetermined temperature. 15. A combustion-type power tool comprising: a housing defining an outer frame; a combustion chamber provided in the housing; a fan positioned in the combustion chamber; a motor that drives the fan; an ignition plug having an ignition point exposed to the combustion chamber; a temperature detecting unit detecting a temperature of a target to be temperature-detected; and an avoiding unit that avoids overheating to the target, the avoiding unit controlling operation of one of the ignition plug and the motor based on a temperature detected by he temperature detecting unit. 16. The combustion-type power tool as claimed in claim 15, wherein the target to be temperature-detected is a part associated with the combustion-type power tool. 17. The combustion-type power tool as claimed in claim 16, wherein the part is at least one of the housing and a handle of the combustion type power tool. 18. The combustion-type power tool as claimed in claim 15, wherein the avoiding unit controls operation of the motor based upon the temperature detected by the temperature detecting unit. 19. The combustion-type power tool as claimed in claim 15, wherein the avoiding unit controls operation of the ignition plug based on the temperature detected by the temperature detecting unit. 20. The combustion-type power tool as claimed in claim 15, wherein the avoiding unit controls operation of one of the ignition plug and the motor based on the temperature detected by the temperature detecting unit so as to at least avoid thermal damage to seal portions of the combustion-type power tool.
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