Magnetic drill press with alternate power source
AssigneeBlack & Decker Inc.
InventorDaniele C. Brotto
Life of this patent
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Abstract
A magnetic drill is provided with an alternate power source. The drill is comprises of: an electric motor for driving a tool; a controller configured to receive an AC input signal and operable to control a drive signal to the electric motor; an electromagnet arranged in a base of the drill housing and operable, in response to a DC voltage, to magnetically couple the base to a surface proximate to the base; an AC/DC converter configured to receive the AC input signal and operates, independent from the controller and in the presence of the AC input signal, to output a DC voltage to the electromagnet; and an alternate power source circuit that monitors the DC voltage output by the converter and, in the absence thereof, provides an alternate DC voltage to the electromagnet.
Claims12
A magnetic drill, comprising:
- a housing with a base configured to attach to a surface;
- an electric motor for driving a tool;
- a controller configured to receive an AC input signal and operable to control a drive signal to the electric motor;
- an electromagnet arranged in the base of the housing and powered by a DC voltage, to magnetically couple the base to the surface;
- a converter configured to receive the AC input signal and, independent from the controller and in a presence of the AC input signal, to output the DC voltage to the electromagnet;
- an alternate power source circuit that monitors the DC voltage output by the converter and, in a absence of the DC voltage, provides an alternate DC voltage to the electromagnet.
A magnetic drill, comprising:
- a housing with a base configured to attach to a surface;
- an input to receive an input voltage signal;
- a controller configured to receive the input voltage signal;
- an electromagnet arranged in the base of the housing and powered by the input voltage signal to magnetically couple the base to the surface;
- a first diode interposed between the input and the electromagnet;
- and
- an alternate power source circuit having a battery coupled in series with a second diode, wherein the second diode is forward biased in a absence of the input voltage signal across the first diode and thereby electrically couples the battery to the electromagnet, the second diode having a cathode electrically coupled to a node and the node is interposed between the first diode and the electromagnet.
Dependencies are inferred from the claim text.