David D Spence

Address:

10206 Great Pln Ln, Houston, TX 77064

Phone:

2819551445

VIN:

3FAHP08119R216857

Make:

FORD

Model:

FUSION

Year:

2009

US Patent:

7835502, Nov 16, 2010

Filed:

Feb 11, 2009

Appl. No.:

12/369449

Inventors:

David Arthur Spence - Hartland WI, US
Richard Cary Schmidt - Verona WI, US

Assignee:

Tomotherapy Incorporated - Madison WI

International Classification:

H01J 35/08
H05G 1/00

US Classification:

378143, 378204

Abstract:

An x-ray target pedestal assembly and a method of protecting the x-ray target from breaking down as a result of the extreme heat that is produced when an electron beam is aimed at the target to produce x-rays. The target is submerged in cooling fluid and is rotated by a constant flow of the cooling fluid over and around the target in order to dissipate heat. The fluid is guided by integrated flow diverters in the target cover. The target may also be protectively coated either in its entirety or along the electron beam path in order to further protect it from the heat of the electron beam impact or from breakdown as a result of attack of free radicals or other chemically reactive components of the cooling fluid which are produced in the extreme target environment.

US Patent:

52979210, Mar 29, 1994

Filed:

Jul 8, 1993

Appl. No.:

8/089404

Inventors:

Scott L. Springer - Milwaukee WI
David A. Spence - Milwaukee WI

Assignee:

Rite-Hite Corporation - Milwaukee WI

International Classification:

B65G 6900

US Classification:

414401

Abstract:

A device for releasably locking a parked vehicle at a loading dock during loading and unloading thereof. The device is provided with a carriage mounted for vertical adjustment relative to the front wall of the dock and adapted to be yieldably engaged by a depending safety bar of the parked vehicle. A hook-like member is mounted on the carriage for independent rectilinear movement between an operative mode wherein the vehicle safety bar is lockingly engaged thereby and an inoperative safety bar-release mode. A power-actuated unit is mounted on the carriage and is connected by a linkage assembly to the hook-like member and effects movement thereof between the operative and inoperative modes. The linkage assembly includes a pair of pivotally connected links one of which has an end portion pivotally connected to the hook-like member and the other has an end portion pivotally connected to a lower portion of the carriage. One of the links is pivotally connected to a movable portion of the unit and when the latter is moving in one relative direction causes the linkage assembly to move the hook-like member to the operative mode.

US Patent:

20160108582, Apr 21, 2016

Filed:

Sep 16, 2015

Appl. No.:

14/856178

Inventors:

- Oak Creek WI, US
David A. SPENCE - Hartland WI, US
Justin Jerome PIPOL - Union Grove WI, US
Michael David Thompson - Oak Creek WI, US

International Classification:

E01B 27/02

Abstract:

A regulator moldboard and grader blade assembly is provided and includes a moldboard having at least one transversely extending pin, the pin having a notch with a surface inclined toward the moldboard. At least one grader blade has at least one mounting opening having a flared surface complementary to the notch so that the blade is hangable on the pin so that the notch draws the blade against the moldboard as a fastener tightens the blade to the moldboard.

US Patent:

20150083914, Mar 26, 2015

Filed:

Sep 18, 2014

Appl. No.:

14/490312

Inventors:

- Oak Creek WI, US
David A. Spence - Hartland WI, US

International Classification:

G01B 11/27
E01B 35/00

US Classification:

2503381, 2504931

Abstract:

A railway reference machine is provided for surveying and aligning a railroad track, and includes a collapsible projector assembly having a pusher buggy assembly, and a lifting device. A plurality of projectors is mounted to a projector cart. The pusher buggy assembly has extendable and retractable linkage sections such that the linkage sections are stackable and nestable within a space defined by the lifting device and the projector cart. At one end, the pusher buggy assembly is connected to the projector cart and at an opposite end is connected to the lifting device such that the projector cart pivots upwardly about a pivot point to rest the projector assembly in a space defined by a chassis being dimensional for supporting the reference machine, and pivots downwardly about the pivot point to lower the projector assembly on the railroad track.