IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0637571
(2003-08-11)
|
우선권정보 |
JP-0233387 (2002-08-09); JP-0233388 (2002-08-09) |
발명자
/ 주소 |
- Shima, Yukihiro
- Ohmori, Yasuki
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
24 인용 특허 :
14 |
초록
▼
A combustion-powered nail gun drives nails into a workpiece when both a head switch and a trigger switch are turned ON. The head switch is turned ON when a push lever is urged against the workpiece. Fuel/air mixture in a combustion chamber is ignited when the head switch and the trigger switch are t
A combustion-powered nail gun drives nails into a workpiece when both a head switch and a trigger switch are turned ON. The head switch is turned ON when a push lever is urged against the workpiece. Fuel/air mixture in a combustion chamber is ignited when the head switch and the trigger switch are turned ON irrespective of an order in which the head switch and the trigger switch are turned ON, whereby “successive-shot driving” can be performed in which the trigger switch is maintained in its ON position while successively driving a plurality of nails at different locations of the workpiece by repeatedly pushing and releasing the push lever toward and away from the workpiece.
대표청구항
▼
1. A combustion-powered tool for driving a fastener into a workpiece, comprising:a housing having an upper end portion, a lower end portion, an inner surface, and an outer surface;a push lever supported at the lower end portion of the housing;a head cover disposed at the upper end portion of the hou
1. A combustion-powered tool for driving a fastener into a workpiece, comprising:a housing having an upper end portion, a lower end portion, an inner surface, and an outer surface;a push lever supported at the lower end portion of the housing;a head cover disposed at the upper end portion of the housing;a cylinder fixedly disposed in the housing and formed with an exhaust hole;a piston slidably movably disposed in the cylinder and dividing the cylinder into an upper chamber and a lower chamber, the piston being movable toward its lower dead center and its upper dead center;a combustion chamber frame disposed within the housing and movable in interlocking relation with the movement of the push lever to bring into contact with and out of contact from the head cover, wherein a combustion chamber is defined by the combustion chamber frame, the head cover, and the piston when the combustion chamber frame is in contact with the head cover;a driver blade extending from the piston into the lower chamber, a fastener driving operation being performed by the driver blade in accordance with the movement of the piston toward the lower dead center;a spark plug exposed to the combustion chamber for igniting a fuel/air mixture provided in the combustion chamber;a first switch that is turned ON when the combustion chamber is detected to be hermetically sealed and OFF when the combustion chamber is detected to be open to atmosphere;a second switch that is turned ON when manipulated by an operator and OFF when manipulation by the operator is stopped; anda control unit for controlling the spark plug to ignite the fuel/air mixture when both the first switch and the second switch are turned ON irrespective of an order in which the first switch and the second switch are turned ON. 2. The combustion-powered tool according to claim 1, further comprising a fan rotatably disposed in the combustion chamber, wherein the fan is rotated when at least one of the first switch and the second switch is turned ON. 3. The combustion-powered tool according to claim 1, further comprising gaseous fuel introducing means for introducing gaseous fuel into the combustion chamber in synchronism with a timing at which one of the first switch and the second switch is turned ON, wherein generation of a spark by the spark plug is delayed a first predetermined period of time from the timing when one of the first switch and the second switch is turned ON. 4. The combustion-powered tool according to claim 3, wherein after generation of the spark, subsequent generation of the spark is prohibited for a second predetermined period of time. 5. The combustion-powered tool according to claim 1, further comprising alerting means for alerting the operator that the fastener driving operations are ready to be performed, the alerting means visually signaling the operator from at least two different locations on the housing when one of the first switch and the second switch is turned ON. 6. The combustion-powered tool according to claim 1, further comprising alerting means for audibly signaling the operator that the fastener driving operations are ready to be performed. 7. A combustion-powered tool for driving a fastener into a workpiece, comprising:a housing having an upper end portion, a lower end portion, an inner surface, and an outer surface;a push lever supported at the lower end portion of the housing;a head cover disposed at the upper end portion of the housing;a cylinder fixedly disposed in the housing and formed with an exhaust hole;a piston slidably movably disposed in the cylinder and dividing the cylinder into an upper chamber and a lower chamber, the piston being movable toward its lower dead center and its upper dead center;a combustion chamber frame disposed within the housing and movable in interlocking relation with the movement of the push lever to bring into contact with and out of contact from the head cover, wherein a combustion chamber is defined by the combustion c hamber frame, the head cover, and the piston when the combustion chamber frame is in contact with the head cover;a driver blade extending from the piston into the lower chamber, a fastener driving operation being performed by the driver blade in accordance with the movement of the piston toward the lower dead center;a spark plug exposed to the combustion chamber for igniting a fuel/air mixture provided in the combustion chamber;a first switch that is turned ON when the combustion chamber is detected to be hermetically sealed and OFF when the combustion chamber is detected to be open to atmosphere;a second switch that is turned ON when manipulated by an operator and OFF when manipulation by the operator is stopped; anddelaying means for delaying opening of the combustion chamber to atmosphere until the piston moves back to its upper dead center from its lower dead center. 8. The combustion-powered tool according to claim 7, wherein the delay means comprises a supporting member for supporting the combustion chamber frame to a position where the combustion chamber is hermetically sealed. 9. The combustion-powered tool according to claim 8, wherein the supporting member comprises a solenoid and a plunger wherein the plunger is engageable with and disengageable from the combustion chamber frame depending upon whether the solenoid is energized or deenergized. 10. The combustion-powered tool according to claim 8, wherein the supporting member comprises a solenoid, a plunger, and a timer, wherein the timer measures a predetermined period of time and the solenoid is energized during the predetermined period of time, the plunger being held in contact with the combustion chamber frame when the solenoid is energized. 11. The combustion-powered tool according to claim 8, wherein the supporting member comprises an engagement member engageable with a groove formed in the combustion chamber frame, and a resilient member for urging the engagement member toward the groove. 12. The combustion-powered tool according to claim 8, wherein the supporting member comprises a sealing member provided to the cylinder, the sealing member being in slidable contact with the combustion chamber frame. 13. The combustion-powered tool according to claim 7, wherein the delay means comprises a piston detector for detecting that the piston has returned to the upper dead center and generating a detection signal when the piston detector detects that the piston has returned to the upper dead center; a solenoid energized when the detection signal is not generated from the piston detector and deenergized when the detection signal is generated from the piston detector under a condition when both the first switch and the second switch are turned ON; and a plunger moved to a first position when the solenoid is energized and to a second position when the solenoid is deenergized, wherein the plunger is engaged with the combustion chamber frame when the plunger is in the first position whereas the plunger is disengaged from the combustion chamber frame when the plunger is in the second position. 14. The combustion-powered tool according to claim 13, wherein the position detector optically detects that the piston has returned to the upper dead center. 15. The combustion-powered tool according to claim 13, wherein the position detector magnetically detects that the piston has returned to the upper dead center. 16. The combustion-powered tool according to claim 13, wherein the position detector ultrasonically detects that the piston has returned to the upper dead center. 17. The combustion-powered tool according to claim 13, wherein the position detector comprises a vibration acceleration sensor that detects vibration acceleration generated at a time when the piston has returned to its upper dead center.
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