Hole saw arbor assembly

Patent metadata

Field	Value
Publication number	US-10532412-B2
Application number	US-201715712268-A
Country	US
Kind code	B2
Filing date	Sep 22, 2017
Priority date	Sep 23, 2016
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A cutting tool includes a hole saw, a pilot bit, and an arbor assembly. The assembly includes a shank having a first end and a second end. The first end of the shank is removably coupled to the hole saw and to the pilot bit, and the second end of the shank is configured to be coupled to a power tool. The assembly also includes a sleeve moveable along the shank and a first ball bearing disposed on the sleeve. The first ball bearing engages the hole saw to releasably secure the hole saw to the shank. The assembly includes a second ball bearing disposed on the shank. The second ball bearing engages the pilot bit to releasably secure the pilot bit to the shank. When the sleeve moves toward the second end of the shank, the first and second ball bearings disengage the hole saw and the pilot bit.

First claim

What is claimed is:

1. A cutting tool comprising:
a hole saw;
a pilot bit; and
an arbor assembly including
a shank having a first end and a second end and defining a longitudinal axis extending through the first and second ends, the first end of the shank removably coupled to the hole saw and to the pilot bit, the second end of the shank configured to be coupled to a power tool,
a sleeve moveable along the shank in a direction parallel to the longitudinal axis,
a first ball bearing disposed on the sleeve and moveable with the sleeve the first ball bearing engaging the hole saw to releasably secure the hole saw to the shank, and
a second ball bearing disposed on the shank and moveable relative to the sleeve, the second ball bearing engaging the pilot bit to releasably secure the pilot bit to the shank,

wherein the sleeve is moveable to a first position where the hole saw and the pilot bit are secured to the arbor assembly, to a second position where the first ball bearing disengages the hole saw, allowing removal of the hole saw from the shank, and to a third position where the second ball bearing disengages the pilot bit, allowing removal of the pilot bit from the shank.

2. The cutting tool of claim 1 , wherein the shank defines a recess, and wherein the first ball bearing aligns with the recess when the sleeve moves toward the second end of the shank.

3. The cutting tool of claim 2 , wherein the first ball bearing is moved radially outward to engage the hole saw when the sleeve moves toward the first end of the shank, and wherein the first ball bearing is moved radially inward to disengage the hole saw when the sleeve moves toward the second end of the shank.

4. The cutting tool of claim 3 , wherein the hole saw includes an end cap defining a channel, wherein the channel receives the first ball bearing when the sleeve moves towards the first end of the shank.

5. The cutting tool of claim 1 , wherein the shank defines an opening, wherein the opening receives a portion of the pilot bit, and wherein the second ball bearing extends into the opening and engages the portion of the pilot bit when the sleeve moves towards the first end of the shank.

6. The cutting tool of claim 5 , wherein the second ball bearing is moved radially inward to engage the pilot bit when the sleeve moves toward the first end of the shank, and wherein the second ball bearing is moved radially outward to disengage the hole saw when the sleeve moves toward the second end of the shank.

7. The cutting tool of claim 5 , wherein the opening is a hex-shaped opening, and wherein the pilot bit includes a hex-shaped shaft that is received in the hex-shaped opening.

8. The cutting tool of claim 5 , wherein the arbor assembly further includes a spring element supported by the sleeve, and wherein the spring element aligns with and engages the second ball bearing when the sleeve moves towards the first end of the shank.

9. The cutting tool of claim 1 , wherein the first ball bearing is part of a plurality of first ball bearings circumferentially spaced around the shank, and wherein the plurality of first ball bearings engages the hole saw to releasably secure the hole saw to the shank.

10. The cutting tool of claim 1 , wherein the arbor assembly further includes a spring coupled to the sleeve, and wherein the spring biases the sleeve toward the first end of the shank.

11. The cutting tool of claim 10 , wherein the spring includes a coil spring positioned around a portion of the shank.

12. The cutting tool of claim 11 , wherein the spring is positioned within the sleeve.

13. A cutting tool comprising:
a hole saw; and
an arbor assembly including
a shank having a first end and a second end and defining a longitudinal axis extending through the first and second ends, the first end of the shank removably coupled to the hole saw, the second end of the shank configured to be coupled to a power tool,
a sleeve moveable along the shank in a direction parallel to the longitudinal axis and including an aperture, and
a ball bearing supported in the aperture and axially moveable with the sleeve relative to the shank in the direction parallel to the longitudinal axis as the sleeve slides along the shank, the ball bearing engaging the hole saw to releasably secure the hole saw to the shank,

wherein when the sleeve moves toward the second end of the shank, the ball bearing moves radially inward and disengages the hole saw, allowing removal of the hole saw from the shank.

14. The cutting tool of claim 13 , wherein the shank defines a recess, and wherein the ball bearing aligns with the recess when the sleeve moves toward the second end of the shank.

15. The cutting tool of claim 14 , wherein the ball bearing is moved radially outward to engage the hole saw when the sleeve moves toward the first end of the shank, and wherein the ball bearing is moved radially inward to disengage the hole saw when the sleeve moves toward the second end of the shank.

16. The cutting tool of claim 15 , wherein the hole saw includes an end cap defining a channel, wherein the channel receives the ball bearing when the sleeve moves towards the first end of the shank.

17. The cutting tool of claim 13 , wherein the ball bearing is part of a plurality of ball bearings circumferentially spaced around the shank, and wherein the plurality of ball bearings engages the hole saw to releasably secure the hole saw to the shank.

18. The cutting tool of claim 13 , wherein the arbor assembly further includes a spring coupled to the sleeve, and wherein the spring biases the sleeve toward the first end of the shank.

19. The cutting tool of claim 18 , wherein the spring includes a coil spring positioned around a portion of the shank within the sleeve.

20. An arbor assembly for use with a hole saw and a pilot bit, the arbor assembly comprising:
a shank having a first end and a second end and defining a longitudinal axis extending through the first and second ends, the first end of the shank configured to be coupled to the hole saw and to the pilot bit, the second end of the shank configured to be coupled to a power tool;
a sleeve moveable along the shank in a direction parallel to the longitudinal axis;
a spring biasing the sleeve toward the first end;
a first ball bearing disposed on the sleeve and moveable with the sleeve, the first ball bearing configured to extend radially outward and engage the hole saw to releasably secure the hole saw to the shank; and
a second ball bearing disposed on the shank and moveable relative to the sleeve, the second ball bearing configured to extend radially inward and engage the pilot bit to releasably secure the pilot bit to the shank;
wherein when the sleeve moves toward the second end of the shank, the first ball bearing is configured to axially move with the sleeve and to extend radially inward to disengage the hole saw and the second ball bearing is configured to extend radially outward to disengage the pilot bit, allowing removal of the hole saw and the pilot bit from the shank.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Ward Bryan C

Classifications

• B23B2260/136

  Springs · CPC title

• B23B2260/022

  Balls · CPC title

• B23B51/0473 Primary

  Details about the connection between the driven shaft and the tubular cutting part; Arbors · CPC title

• B23B51/0426

  with centering devices · CPC title

• B23B2231/0204

  Connection of shanks to working elements of tools · CPC title