# US 10,369,670 B2 · Magnetic drill press with alternate power source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,369,670 B2 - Document ID: US10369670B2 - Status: Granted - Kind: B2 - Application number: 16/149,923 - Filed: 2018-10-02 - Published: 2019-01-31 - Granted: 2019-08-06 - Earliest claimed: 2014-04-25 - Assignees: Black & Decker Inc. - Applicants: Black & Decker Inc. - Inventors: Daniele C. Brotto - Web page: https://patentgrep.com/patent/US10369670B2 ## CPC - B23Q 3/1543: {using electromagnets} - B23B 39/14: with special provision to enable the machine or the drilling or boring head to be moved into any desired position, e.g. with respect to immovable work - B25H 1/0071: {by magnetic means} - B23B 2260/024: Batteries - B23B 2260/062: Electric motors - B23B 2270/32: Use of electronics - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B25H: WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS (storing or packaging B65) ## 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. ## Claims ### Claim 1 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 and, in the presence of the AC input signal, to output a DC voltage; 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. ### Claim 2 (depends on 1) The magnetic drill of claim 1 further comprises a switch for powering on and off the motor, wherein the switch having at least two terminals placed in series with the converter. ### Claim 3 (depends on 1) The magnetic drill of claim 1 wherein the controller determines a number of occurrences or an amount of time when the battery is energizing the electromagnet and generates a notification when the number of occurrences of the amount of time exceeds a predefined threshold. ### Claim 4 (depends on 1) The magnetic drill of claim 1 wherein the detector generates a user perceptible alert when the battery is electrically coupled to the electromagnet. ### Claim 5 (depends on 1) The magnetic drill of claim 1 wherein the controller determines a number of occurrences or an amount of time when the battery is energizing the electromagnet and generates a notification when the number of occurrences of the amount of time exceeds a predefined threshold. ### Claim 6 (depends on 2) The magnetic drill of claim 2 wherein the detector further comprises a first diode interposed between the converter and the electromagnet. ### Claim 7 (depends on 6) The magnetic drill of claim 6 wherein the alternate power source circuit includes a battery. ### Claim 8 (depends on 7) The magnetic drill of claim 7 wherein the detector monitors the DC voltage output by the controller and electrically couples the battery to the electromagnet in the absence of a DC voltage output from the converter. ### Claim 9 (depends on 8) The magnetic drill of claim 8 wherein the detector is further defined as a second diode having a cathode electrically coupled to a node interposed between the first diode and the electromagnet. ### Claim 10 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 and, in the presence of the AC input signal, to output a DC voltage; a controller configured to receive the DC voltage from the converter and operable to energize the electromagnet; a first diode interposed between the converter and the controller; and an alternate power source circuit having a battery coupled in series with a second diode, wherein the second diode is forward biased in an absence of the AC input 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 controller and the electromagnet. ### Claim 11 (depends on 10) The magnetic drill of claim 10 further comprises a switch for powering on and off the motor, wherein the switch having at least two terminals placed in series with the converter. ### Claim 12 (depends on 10) The magnetic drill of claim 10 further comprises a charging circuit configured to receive the AC input signal and maintain charge of the battery. ### Claim 13 (depends on 10) The magnetic drill of claim 10 wherein the detector generates a user perceptible alert when the battery is electrically coupled to the electromagnet. ### Claim 14 (depends on 10) The magnetic drill of claim 10 wherein the controller is configured to monitor the battery and generate a notification to replace the battery based on condition of the battery. ### Claim 15 (depends on 10) The magnetic drill of claim 10 wherein the controller determines a number of occurrences or an amount of time when the battery is energizing the electromagnet and generates a notification when the number of occurrences of the amount of time exceeds a predefined threshold.