Bit puller

Patent metadata

Field	Value
Publication number	US-2017246733-A1
Application number	US-201615055988-A
Country	US
Kind code	A1
Filing date	Feb 29, 2016
Priority date	Feb 29, 2016
Publication date	Aug 31, 2017
Grant date	—

Abstract

A bit puller incorporates an inner element with a longitudinal axis and having a central shaft, a base with external threads and an engagement mechanism internal to the inner element adapted to engage a drill bit. An outer element is concentric with the inner element and has a foot portion for engaging a work piece. Internal threads in the outer element are adapted to engage the external threads of the base wherein rotation of the inner element with respect to the outer element withdraws the inner element along the longitudinal axis.

First claim

What is claimed is:

1 . A bit puller comprising:
an inner element with a longitudinal axis and having
a central shaft,
a base, said base having external threads, and,
an engagement mechanism internal to the inner element adapted to engage a drill bit;
an outer element concentric with the inner element and having
a foot portion for engaging a work piece, and
internal threads adapted to engage the external threads of the base wherein rotation of said inner element with respect to the outer element withdraws the inner element along the longitudinal axis.

2 . The bit puller as defined in claim 1 wherein rotation of the inner element about the longitudinal axis engages the engagement mechanism on the drill bit.

3 . The bit puller as defined in claim 1 wherein rotation of a grip on the inner element about the longitudinal axis engages the engagement mechanism on the drill bit.

4 . The bit puller as defined in claim 2 wherein the central shaft further comprises a connector distal from the base.

5 . The bit puller as defined in claim 4 wherein said connector is adapted for engagement by a drill motor.

6 . The bit puller as defined in claim 2 wherein the outer element comprises a first bifurcated section and a second bifurcated section attached with a longitudinal hinge, said sections rotatable about the longitudinal hinge to an open position to be received about the inner element and rotatable to a closed position engaging the internal threads with the external threads.

7 . The bit puller as defined in claim 6 wherein the sections have foot portions engaging a workpiece.

8 . The bit puller as defined in claim 6 further comprising a first lever arm extending from the first bifurcated section and a second lever arm extending from the second bifurcated section, said first and second lever arms substantially aligned with the bifurcated sections in the closed position.

9 . The bit puller as defined in claim 8 further comprising a locking mechanism engaging the first and second lever arms in the closed position.

10 . The bit puller as defined in claim 3 wherein the engagement mechanism comprises a concentric cavity in the central shaft of the inner element to receive the drill bit, said central shaft having slits allowing the cavity to contract to engage the drill bit on an inner wall.

11 . The bit puller as defined in claim 10 wherein the inner element has tapered threads circumscribing the central shaft and the grip has a bore with complimentary threads engaging the tapered threads.

12 . The bit puller as defined in claim 11 wherein the base comprises a collar concentric with the central shaft.

13 . A method for extraction of a drill bit comprising:
engaging a drill bit in an attachment mechanism internal to an inner element; receiving an outer element having internal threads on external threads on the inner element; rotating the inner element with respect to the outer element urging a foot portion of the outer element into contact with a workpiece; withdrawing the inner element on a longitudinal axis thereby extracting the drill bit.

14 . The method as defined in claim 13 wherein engaging the bit is accomplished with a connector.

15 . The method as defined in claim 13 wherein engaging the drill bit comprises a collapsing a cavity in the inner element to bring an inner surface of the cavity into contact with the drill bit.

16 . The method as defined in claim 13 wherein receiving an outer element comprises:
opening the outer element opened by rotating bifurcated sections on a longitudinal hinge to an open position;
placing the outer element around the inner element with a foot portion of the sections engaging the workpiece;
closing the outer element concentrically around the inner element bringing the inner thread into operable engagement with the external thread.

17 . The method as defined in claim 13 wherein engaging a drill bit in an attachment mechanism comprises:
concentrically placing the outer element over the bit with a foot portion engaging the workpiece;
placing the inner element over the bit with the bit extending into a central cavity in a shaft;
rotating the inner element whereby the outer threads of the collar are engaged with the inner threads of the outer element over substantially the entire thread length with the bit extended into the cavity;
attaching the grip to a central shaft of the inner element with complimentary threads on the grip engaging tapered threads on the shaft;
rotating the grip to compress the cavity engaging the bit.

18 . The method as defined in claim 17 further comprising:
further rotating the grip to initiate rotation of the inner element in the outer element;
rotating the inner element upward along on the threads of the outer element thereby removing the drill bit from the workpiece along the longitudinal axis.

Assignees

• Boeing Co

Inventors

• Shehab Kareem Gamal

Classifications

• B25B27/18 Primary

  withdrawing broken threaded parts or twist drills · CPC title

• B23B47/00 Primary

  Constructional features of components specially designed for boring or drilling machines; Accessories therefor (working-spindles, bearing sleeves therefor B23Q1/70; for machine tools in general B23Q) · CPC title

• B25B27/023

  using screws · CPC title