Pilot pin for drill press

Patent metadata

Field	Value
Publication number	US-11110522-B2
Application number	US-201816218695-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Nov 1, 2013
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

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

2. The pilot pin assembly of claim 1 , wherein the second pin is movable against the bias of the spring from the extended position to a retracted position.

3. The pilot pin assembly of claim 2 , 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 pilot pin assembly 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.

5. The pilot pin assembly of claim 1 , wherein the first pin includes a shank portion and a tubular portion interference fit to the shank portion.

6. The pilot pin assembly of claim 5 , wherein the tubular portion defines the interior cavity, and wherein the shank portion includes a plug receivable within the interior cavity.

7. The pilot pin assembly of claim 6 , wherein an end of the spring is adjacent the plug within the interior cavity.

8. The pilot pin assembly of claim 6 , wherein the spring is positioned between the plug and the second pin.

9. The pilot pin assembly of claim 1 , wherein the first pin is movable toward an extended position relative to the tool bit, wherein the pilot pin assembly assumes a first configuration in which both of the first pin and the second pin is in the extended position relative to the tool bit when neither the pilot pin assembly nor the tool bit are in contact with a workpiece.

10. The pilot pin assembly of claim 9 , 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.

11. The pilot pin assembly of claim 10 , 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.

12. The pilot pin assembly of claim 11 , 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.

13. The pilot pin assembly of claim 11 , 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.

14. A pilot pin assembly slidably receivable within a tool bit of a drill press, the pilot pin assembly comprising:
a first pin having a shank portion and a tubular portion, the tubular portion defining an interior cavity;
a second pin at least partially received within the interior cavity; and
a spring positioned within the interior cavity for biasing the second pin toward an extended position relative to the first pin,
wherein the spring is positioned between the shank portion and the second pin.

15. The pilot pin assembly of claim 14 , wherein the second pin is movable against the bias of the spring from the extended position to a retracted position.

16. The pilot pin assembly of claim 15 , 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.

17. The pilot pin assembly of claim 15 , 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.

18. The pilot pin assembly of claim 14 , wherein the tubular portion is interference fit to the shank portion.

19. The pilot pin assembly of claim 14 , wherein the shank portion includes a plug receivable within the interior cavity.

20. The pilot pin assembly of claim 19 , wherein the spring is positioned between the plug and the second pin.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Timmons Terry L
• Plowman Andrew M
• Alves Brian

Classifications

• B23B47/26

  Liftable or lowerable drill heads or headstocks; Balancing arrangements therefor {(weight and flexion compensation B23Q11/001)} · CPC title

• B23B51/0453

  with ejecting devices · CPC title

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2260/136

  Springs · CPC title

• B23B51/0426 Primary

  with centering devices · CPC title