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US 4,267,914 AGranted
Anti-kickback power tool control
AssigneeBlack & Decker Inc.
InventorDavid A. Saar
Life of this patent
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AssigneeBlack & Decker Inc.
InventorDavid A. Saar
Estimating the term…
An impending kickback condition is the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The change in force applied to the power driven tool or other implement is monitored by measuring the rate of change of speed of the tool or implement, and if the speed is decreasing, the rate of change of speed is compared with a threshold value which may be either preset or variable. If this threshold value is exceeded, an output control signal is generated which inhibits the coupling of power to the tool or other implement and/or applies a brake to stop the tool or implement. In order for power to once again be coupled from the motive power source to the shaft, the start switch must be opened and then reclosed or some other signal provided by the operator or another predetermined condition must be met.
In a power tool of the type having an implement driven by a motive power source, the improvement of a system for detecting an impending kickback condition in the power tool comprising:
In a power tool of the type having an implement driven by a motive power source, the improvement of a system for detecting an impending kickback condition in the power tool comprising:
In a power tool of the type having an implement driven by a motive power source, the improvement of an anti-kickback control system for said power tool comprising:
In a power tool of the type having a rotary shaft connected to drive an implement and an electric motor coupled to said rotary shaft to impart a rotary motion thereto, said electric motor being adapted to be connected to a source of electrical power through a switching device, the improvement of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to drive an implement and a pneumatic motor couple to said rotary shaft to impart a rotary motion thereto, said pneumatic motor being adapted to be connected to a source of compressed air through a valve, the improvement of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to drive an implement and an internal combustion engine coupled to said rotary shaft to impart a rotary motion thereto, said internal combustion engine being coupled to said rotary shaft by means of a clutch, the improvment of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to drive an implement and a motive power source coupled to said rotary shaft to impart a rotary motion thereto, the improbement of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to an implement and an electric motor coupled to said rotary shaft to impart a rotary motion thereto, said electric motor being adapted to be connected to a source of electrical power through a switching device, the improvement of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to an implement and a pneumatic motor coupled to said rotary shaft to impart a rotary motion thereto, said pneumatic motor being adapted to be connected to a source of compressed air through a solenoid operated valve, the improvement of an anti-kickback control system comprising:
In a power tool of the type having a rotary shaft connected to an implement and an internal combustion engine coupled to said rotary shaft to impart a rotary motion thereto, said internal combustion engine being coupled to said rotary shaft by means of a solenoid operated clutch, the improvement of an anti-kickback control system comprising:
In a power tool of the type having an implement driven by a motive power source, the improvement of an anti-kickback control system for said power tool comprising:
In a power tool of the type having a rotary shaft connected to drive an implement and an electric motor coupled to said rotary shaft to impart a rotary motion thereto, said electric motor being adapted to be connected to a source of electrical power through a switching device, the improvement of an anti-kickback control system for said power tool comprising:
A method of detecting an impending kickback condition in a power tool of the type having an implement driven by a motive power source, the method comprising the steps of:
A method of detecting an impending kickback condition in a power tool of the type having an implement driven by a motive power source, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having an implement driven by a motive power source, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to drive an implement and an electric motor coupled to said rotary shaft to impart a rotary motion thereto, said electric motor being adapted to be connected to a source of electrical power through a switching device, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to drive an implement and a pneumatic motor coupled to said rotary shaft to impart a rotary motion thereto, said pneumatic motor being adapted to be connected to a source of compressed air through a valve, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to drive an implement and an internal combustion engine coupled to said rotary shaft to impart a rotary motion thereto, said internal combustion engine being coupled to said rotary shaft by means of a clutch, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to drive an implement and a motive power source coupled to said rotary shaft to impart a rotary motion thereto, said method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to an implement and an electric motor coupled to said rotary shaft to impart a rotary motion thereto, said electric motor being adapted to be connected to a source of electrical power through a switching device, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to an implement and a pneumatic motor coupled to said rotary shaft to impart a rotary motion thereto, said pneumatic motor being adapted to be connected to a source of compressed air through a solenoid operated valve, the method comprising the steps of:
A method of eliminating kickback in a power tool of the type having a rotary shaft connected to an implement and an internal combustion engine coupled to said rotary shaft to impart a rotary motion thereto, said internal combustion engine being coupled to said rotary shaft by means of a solenoid operated clutch, the method comprising the steps of:
Dependencies are inferred from the claim text.