Powered circular saw retention apparatus for retractable saw blade guard
First Claim
1. A retention apparatus for an electrically powered hand-held circular saw, the circular saw having a retractable lower saw blade guard, a saw blade, a saw-blade motor for rotating the saw blade, and a power on/off switch that Supplies electrical power to the saw-blade motor when activated, the retention apparatus comprising:
- a lower saw blade guard (LSBG) holder coupled to the power on/off switch wherein the LSBG holder engages the lower saw blade guard only when the lower saw blade guard is in a substantially retracted position and maintains the lower saw blade guard in the retracted position when power is applied to the motor, and releases the lower saw blade guard to allow the lower saw blade guard to return to a default position of covering the saw blade when power is not applied to the motor.
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Accused Products
Abstract
A retention apparatus for an electrically powered hand-held circular saw having a retractable lower saw blade guard, that holds the lower saw blade guard in the retracted position as long as the power on/off switch is activated. This lower saw blade guard holder enables the saw operator to readily manipulate the saw with one hand while using the other hand to improve the safety environment of the cutting action, such as holding the material to be cut, or keeping the power cord out of the path of the saw during the cutting activity. In one embodiment, the lower saw blade guard holder comprises an electromagnet, wired to the power on/off switch, which holds a section of ferromagnetic material on the lower saw blade guard. Another embodiment of this invention has the lower saw blade guard holder mechanically latched by a latch that is mechanically coupled to the power on/off switch. In one embodiment, the lower saw blade guard holder also contains a lamp for lighting up the material being cut.
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Citations
20 Claims
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1. A retention apparatus for an electrically powered hand-held circular saw, the circular saw having a retractable lower saw blade guard, a saw blade, a saw-blade motor for rotating the saw blade, and a power on/off switch that Supplies electrical power to the saw-blade motor when activated, the retention apparatus comprising:
a lower saw blade guard (LSBG) holder coupled to the power on/off switch wherein the LSBG holder engages the lower saw blade guard only when the lower saw blade guard is in a substantially retracted position and maintains the lower saw blade guard in the retracted position when power is applied to the motor, and releases the lower saw blade guard to allow the lower saw blade guard to return to a default position of covering the saw blade when power is not applied to the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrically powered hand-held circular saw comprising:
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a retractable lower saw blade guard; a saw blade; a saw-blade motor for rotating the saw blade; a power on/off switch that supplies electrical power to the saw-blade motor when activated; and a retention apparatus, the retention apparatus comprising; a lower saw blade guard (LSBG) holder coupled to the power on/off switch wherein the LSBG holder engages the lower saw blade guard only when the lower saw blade guard is in a substantially retracted position and maintains the lower saw blade guard in the retracted position when power is applied to the motor, and releases the lower saw blade guard to allow the lower saw blade guard to return to a default position of covering the saw blade when power is not applied to the motor. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for holding a retractable lower saw blade guard of an electrically powered hand-held circular saw, the circular saw having a motor and a power on/off switch, the lower saw blade guard having a lever for manually urging the lower saw blade guard to a substantially retracted position the method comprising the steps of:
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engaging the lower saw blade guard only when the lower saw blade guard is in a substantially retracted position and holding the lower saw blade guard in the substantially retracted position with a retention mechanism for as long as the power on/off switch is activated to apply power to the motor; and automatically releasing the lower saw blade guard when power is not applied to the motor. - View Dependent Claims (17, 18, 19, 20)
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Specification