Accessible temporary magnet control for magnetic drill press

Patent metadata

Field	Value
Publication number	US-9849581-B2
Application number	US-201414256098-A
Country	US
Kind code	B2
Filing date	Apr 18, 2014
Priority date	Apr 19, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A drill press includes a main housing, a base coupled to the main housing and having an electromagnet, a drill unit supported by the main housing for relative movement therewith, a first switch selectively electrically connecting the electromagnet to a power source to energize the electromagnet, and a second switch for selectively interrupting power to the electromagnet.

First claim

What is claimed is:

1. A drill press comprising:
a main housing;
a handle coupled to the main housing;
a base coupled to the main housing and including an electromagnet;
a drill unit supported by the main housing for relative movement therewith;
a toggle switch actuatable between a closed state, in which power is delivered to the electromagnet from a power source to energize the electromagnet, and an open state, in which power to the electromagnet is interrupted; and
a normally closed momentary switch wired in series with the toggle switch for selectively interrupting power to the electromagnet when the toggle switch is in the closed state, wherein the momentary switch is proximate the handle, and wherein the momentary switch is actuatable by a user of the drill press with a single hand, while gripping the handle, to interrupt power to the electromagnet when the toggle switch is in the closed state.

2. The drill press of claim 1 , wherein the normally closed momentary switch includes an internal spring that biases the normally closed momentary switch into a normally closed state.

3. The drill press of claim 1 , wherein the normally closed momentary switch is actuated by a plunger movable in a direction transverse to a drilling axis.

4. The drill press of claim 1 , wherein the second switch includes an internal spring that biases the second switch into a normally closed state.

5. The drill press of claim 1 , wherein the second switch is actuated by a plunger movable in a direction transverse to a drilling axis.

6. A method of attaching an electromagnet in a base of a drill press to a workpiece, the method comprising:
positioning the base on the workpiece;
energizing the electromagnet by actuating a first switch to electrically connect the electromagnet to a power source;
interrupting power to the electromagnet by actuating a second switch;
re-positioning the base on the workpiece; and
re-energizing the electromagnet by releasing the second switch.

7. The method of claim 6 , wherein the second switch is a normally closed momentary switch.

8. The method of claim 6 , wherein the first switch is actuatable between an open state, in which power to the electromagnet is interrupted, and a closed state, in which power is delivered to the electromagnet.

9. The drill press of claim 8 , wherein actuating the second switch opens the second switch to interrupt power to the electromagnet regardless of the state of the first switch.

10. The drill press of claim 6 , wherein the second switch is wired in series with the first switch.

11. The drill press of claim 6 , further comprising a handle coupled to the main housing, wherein the second switch is proximate the handle, and wherein actuating the second switch is done by a user of the drill press with a single hand, while gripping the handle, to interrupt power to the electromagnet.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Timmons Terry L

Classifications

• Y10T408/554

  Magnetic or suction means · CPC title

• B23B45/00

  Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• B25H1/0021

  Stands, supports or guiding devices for positioning portable tools or for securing them to the work (B23B41/00 takes precedence) · CPC title

• Y10T408/13

  with randomly-actuated stopping means · CPC title

• B25H1/0071 Primary

  by magnetic means · CPC title