COMBUSTION-POWERED TOOL WITH IMPROVED IGNITION STARTING FEATURE
First Claim
1. A combustion-powered driving tool for driving fasteners into a workpiece, comprising:
- a push lever;
a push switch that detects that the push lever is pressed against the workpiece and outputs a first signal indicative of a pressed condition;
a trigger switch that instructs driving the fastener into the workpiece and outputs a second signal indicative of an instruction to drive the fastener;
a combustion chamber;
a sparkplug that is exposed in the combustion chamber and ignites a mixture of air and flammable gas in the combustion chamber to create a driving force for driving the fastener into the workpiece; and
a controller that is responsive to the first signal and the second signal and commences an igniting operation of the sparkplug at a timing after expiration of a period of time staring from a timing at which the first signal is output from the push switch.
1 Assignment
0 Petitions
Accused Products
Abstract
A combustion-powered driving tool for driving nails or other fasteners includes a push lever, a push switch, a trigger switch, a combustion chamber, a sparkplug, and a control section. The push switch is provided for detecting that the push lever is pressed against the workpiece and outputs a first signal indicative of a pressed condition. The trigger switch is provided for instructing to drive the fastener into the workpiece. The trigger switch outputs a second signal indicative of an instruction to drive the fastener. The sparkplug is exposed in the combustion chamber and ignites a mixture of air and flammable gas in the combustion chamber to create a driving force for driving the fastener into the workpiece. The control section is responsive to the first signal and the second signal and commences an igniting operation of the sparkplug at a timing after expiration of a prescribed period of time staring from a timing at which the first signal is output from the push switch.
24 Citations
12 Claims
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1. A combustion-powered driving tool for driving fasteners into a workpiece, comprising:
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a push lever; a push switch that detects that the push lever is pressed against the workpiece and outputs a first signal indicative of a pressed condition; a trigger switch that instructs driving the fastener into the workpiece and outputs a second signal indicative of an instruction to drive the fastener; a combustion chamber; a sparkplug that is exposed in the combustion chamber and ignites a mixture of air and flammable gas in the combustion chamber to create a driving force for driving the fastener into the workpiece; and a controller that is responsive to the first signal and the second signal and commences an igniting operation of the sparkplug at a timing after expiration of a period of time staring from a timing at which the first signal is output from the push switch. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combustion-powered driving tool for driving fasteners into a workpiece, comprising:
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a housing having a first end and a second end opposite the first end; a head section for fixing to the first end of the housing and having a flammable gas channel formed therein; a motor; a battery for driving the motor; a cylinder; a piston slidably movably disposed inside the cylinder; a combustion chamber frame that moves to contact and separate from the head section and that forms a combustion chamber together with the head section, the cylinder, and the piston when the combustion chamber frame is in contact with the head section; a fan rotatably disposed in the combustion chamber and driven to rotate by the motor; a sparkplug exposed in the combustion chamber for igniting a mixture of air and flammable gas in the combustion chamber, the flammable gas being supplied into the combustion chamber via the flammable gas channel, wherein explosive combustion caused by firing of the sparkplug moves the piston toward the second end of the housing and a fastener is driven into the workpiece in accordance with the movement of the piston; a push lever movably provided to the second end of the housing; a push switch that detects that the push lever is pressed against the workpiece and outputs a first signal indicative of a pressed condition; a trigger switch that instructs driving the fastener into the workpiece and outputs a second signal indicative of an instruction to drive the fastener; a temperature sensor that senses ambient temperature; a battery voltage detector that detects a battery voltage; and a controller that is responsive to the first signal and the second signal and commences an igniting operation of the sparkplug at a timing after expiration of a period of time staring from a timing at which the first signal is output from the push switch. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification