Pilot pin for drill press

Patent metadata

Field	Value
Publication number	US-9873156-B2
Application number	US-201415032721-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Nov 1, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A pilot pin assembly is slidably receivable within a tool bit of a drill press. The pilot pin assembly includes a first pin defining an interior cavity, and a second pin at least partially received within the interior cavity of the first pin. A spring is positioned within the interior cavity for biasing the second pin toward an extended position relative to the first pin.

First claim

What is claimed is:

1. A magnetic drill press operable to perform work on a workpiece with a tool bit, the magnetic drill press comprising:
a base attachable to the workpiece;
a housing supported by the base;
a motor positioned within the housing;
a spindle coupled to the motor for rotation about a rotational axis, the tool bit being attachable to the spindle for co-rotation therewith; and
a pilot pin assembly at least partially extending through the tool bit for providing an indication where the rotational axis intersects the workpiece, the pilot pin assembly including a first pin and a second pin telescopically received within the first pin,
wherein the spindle includes a bore coaxial with the rotational axis, and wherein the first pin is at least partially receivable within the bore.

2. The magnetic drill press of claim 1 , wherein the second pin is movable between an extended position and a retracted position relative to the first pin.

3. The magnetic drill press of claim 2 , wherein the first pin defines an interior cavity, and wherein in the retracted position, a greater length of the second pin is contained within the interior cavity of the first pin compared to the extended position.

4. The magnetic drill press of claim 3 , wherein the pilot pin assembly further includes a spring positioned within the interior cavity for biasing the second pin toward the extended position.

5. The magnetic drill press of claim 4 , wherein the second pin is movable against the bias of the spring from the extended position to the retracted position.

6. The magnetic drill press of claim 2 , wherein the first pin defines an outer periphery, and wherein no portion of the second pin protrudes from the outer periphery of the first pin when in the retracted position.

7. The magnetic drill press of claim 1 , wherein the pilot pin assembly assumes a first configuration in which both of the first and second pins are in an extended position relative to the tool bit when neither the pilot pin assembly nor the tool bit are in contact with the workpiece.

8. The magnetic drill press of claim 7 , wherein the pilot pin assembly assumes a second configuration in which the first pin is in the extended position and the second pin is in a retracted position relative to the first pin when only the second pin is in contact with the workpiece.

9. The magnetic drill press of claim 8 , wherein the pilot pin assembly assumes a third configuration in which the first pin is in a retracted position relative to the tool bit and the second pin is in the retracted position relative to the first pin when the tool bit is in contact with the workpiece.

10. The magnetic drill press of claim 9 , wherein the pilot pin assembly transitions from the first configuration to the second configuration to the third configuration in sequence as the tool bit is lowered onto the workpiece.

11. The magnetic drill press of claim 9 , wherein the pilot pin assembly transitions from the third configuration to the second configuration to the first configuration in sequence as the tool bit is raised from the workpiece.

12. The magnetic drill press of claim 9 , wherein the spindle includes a bore coaxial with the rotational axis, and wherein the first pin is received within the bore only when the pilot pin assembly assumes the third configuration.

13. The magnetic drill press of claim 8 , wherein the spindle includes a bore coaxial with the rotational axis, and wherein the first pin is positioned outside the bore when the pilot pin assembly assumes the second configuration.

14. The magnetic drill press of claim 1 , further comprising a spring positioned in the bore for biasing the pilot pin assembly outward from the tool bit.

15. The magnetic drill press of claim 14 , further comprising a seat positioned in the bore between the spring and the pilot pin assembly.

16. The magnetic drill press of claim 1 , wherein the first pin includes a shank portion and a tubular portion interference fit to the shank portion.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Timmons Terry L
• Plowman Andrew M
• Alves Brian

Classifications

• B23B51/0453

  with ejecting devices · CPC title

• B23Q9/0007

  Portable machines comprising means for their guidance or support directly on the workpiece · CPC title

• B25H1/0071

  by magnetic means · CPC title

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2260/136

  Springs · CPC title