Magnetic drill press with alternate power source
AssigneeBlack & Decker Inc.
InventorDaniele C. Brotto
Life of this patent
Estimating the term…
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.
Claims19
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 the 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 the 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 and a second diode that monitors the input voltage signal and electrically couples the battery to the electromagnet in the absence of the input voltage signal, second diode having a cathode electrically coupled to a node interposed between the first diode and the electromagnet.
A magnetic drill, comprising:
- a housing with a base configured to attach to a planar surface;
- an electromagnet arranged in the base of the housing and operable, in response to a DC voltage, to magnetically couple the base to a surface proximate to the base;
- an electric motor for driving a tool;
- a converter configured to receive an AC input signal operates, in the presence of the AC input signal, to output a DC voltage to the electromagnet;
- a controller configured to receive the DC voltage from the converter and operable to energize the electromagnet;
- and
- an alternate power source circuit that monitors the DC voltage output by the controller using a detector and, in the absence thereof, provides an alternate DC voltage to the electromagnet, where the detector is interposed between the alternate DC voltage and the electromagnet.
Dependencies are inferred from the claim text.