David J Shea

US Patent:

7441433, Oct 28, 2008

Filed:

Jan 11, 2007

Appl. No.:

11/622013

Inventors:

Mike M. Ghiran - Lake Orion MI, US
Spyros P. Mellas - Waterford MI, US
David H. Shea - Lake Orion MI, US
Paul D. Larsen - Fenton MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

B21C 37/29

US Classification:

72 71, 72 55, 72325

Abstract:

A tool forms a threaded hole in a hydroformed part while the part remains in a hydroforming die cavity and under pressure. The tool has a hole-piercing end portion adapted on advancement of the tool to pierce and form a hole in the part and an extruding portion adapted on continued tool advancement to extrude an annular extrusion that extends into the tube interior. An adjacent sealing portion of the tool seals the hole during the ongoing advancement and extrusion of the annular extrusion so that hydroforming fluid remains under pressure. A thread-forming portion of the tool forms an internal thread within the annular extrusion upon the continued advancement and rotation of the tool.

US Patent:

7731466, Jun 8, 2010

Filed:

Nov 2, 2007

Appl. No.:

11/934471

Inventors:

David H. Shea - Lake Orion MI, US
Brian K Bartnick - Ortonville MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F16B 33/00

US Classification:

4113663, 411308, 411411

Abstract:

The thread form can provide a controlled thread stiffness which can more evenly distribute loads and can be less sensitive to changes in relative pitch. The controlled stiffness of the thread can provide a desired cantilever bending of the thread under assembled load. The thread form can utilize a traditional thread form at and/or above the pitch diameter, thereby maintaining the area of contact close to that of a standard thread form. Standard gaging implements can be used to ascertain the thread pitch and for quality control. The thread form includes a side extending between the crest and the root. The side has a first portion extending from the crest toward the root and the second portion extending from the first portion toward the root. The first and second portions extend toward the root in different orientations relative to the thread.

US Patent:

8220301, Jul 17, 2012

Filed:

Jul 13, 2008

Appl. No.:

12/172242

Inventors:

Mike M. Ghiran - Lake Orion MI, US
Spyros P. Mellas - Waterford MI, US
David H. Shea - Lake Orion MI, US
Thomas W. McClure - Brookfield WI, US
Darrell W Rebman - Kimball Township MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

B21D 28/28
B21D 31/02

US Classification:

72 55, 72 71, 72325, 7237027

Abstract:

A tool adapted to form and method of forming a tapped hole within a workpiece in a single pass, includes a piercing section operable to punch a pilot hole in and produce a slug attached to the workpiece, and a tapping section operable to form a female thread along the periphery of the hole, and more preferably, an extruding section operable to push workpiece material away from the exterior surface defined thereby, an expanding section operable to expand the diameter of the hole, a sealing section operable to seal the hole during a hydroforming process, and a burnishing section operable to further expand and treat the periphery of the hole prior to tapping.

US Patent:

20120097726, Apr 26, 2012

Filed:

Oct 26, 2010

Appl. No.:

12/912003

Inventors:

David H. Shea - Lake Orion MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

B26F 3/00

US Classification:

225 2

Abstract:

A method of separating a length of single-strand wire at a notch location includes forming at least one notch in the length of single-strand wire at the notch location. The notch location is subjected to tensile strain until the notch location ruptures at the notch to separate the length of single-strand wire into a first single-strand wire and a second single-strand wire. After separation of the length of single-strand wire, the first and second single-strands each present a generally tapered end that corresponds to the notch location.

US Patent:

20120251256, Oct 4, 2012

Filed:

Dec 29, 2011

Appl. No.:

13/339564

Inventors:

David H Shea - Lake Orion MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

B23D 77/12
B23D 77/14

US Classification:

408145

Abstract:

A reamer reams a tapered hole in a casting to provide a desired surface roughness of the walls defining the tapered hole. The reamer includes a shank having at least one cutting tool of diamond material, the cutting face extends along a tapered length to a length corresponding to the length of the tapered hole. The cutting face has a plurality of undulations along the cutting face. The undulations include alternating crests and troughs that machine the walls of the tapered hole and provide thereon a surface roughness within desired limits of surface roughness.