David C Carpenter

US Patent:

8079322, Dec 20, 2011

Filed:

Jul 17, 2009

Appl. No.:

12/504977

Inventors:

David A. Carpenter - Clarksville MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

F41A 33/00
F42B 8/00

US Classification:

116 23, 434 11, 102498

Abstract:

A shock tube apparatus may include a plenum to hold a volume of gas. The plenum may include a hollow chamber having a first end and a second end located opposite one another along a longitudinal axis, the first end of the chamber defining a shock egress opening. A valve assembly may be positioned at the first end of the chamber to seal the shock egress opening. A piston may be positioned within a recess located at the second end of the chamber. The piston may separate a first volume located between the piston and the first end of the chamber from a smaller second volume located between the piston and the second end of the chamber. A tension supporting rod may connect the valve assembly to the piston. A release valve may be in fluid connection with the second volume and a switch may be operable to open the release valve to release gas from the second volume and trigger opening of the valve assembly to generate a shock wave through the shock egress opening.

US Patent:

20060206233, Sep 14, 2006

Filed:

Mar 9, 2005

Appl. No.:

11/076004

Inventors:

David Carpenter - Clarksville MD, US
Daniel Puzio - Baltimore MD, US
Michael O'Banion - Westminster MD, US

International Classification:

G06F 19/00

US Classification:

700159000, 700195000, 700180000

Abstract:

An apparatus for obtaining a desired cut in a workpiece and a method of using the same is provided. The apparatus has a base with a cutting member moveably coupled thereto. A scanner is coupled with the base for scanning the profile of the workpiece desired to be cut. A computing device may use information from the scanning process to control transverse and longitudinal stepper motors to move the cutting member through a desired cutting path to achieve a cut based on the profile of the workpiece, such as a cope cut. A user can store profiles of previously scanned workpieces in a memory component of the computing device.

US Patent:

20140000471, Jan 2, 2014

Filed:

Jun 27, 2012

Appl. No.:

13/534246

Inventors:

David Alan Carpenter - Clarksville MD, US
Brandon S. Recchia - Parkville MD, US
Paul Andrew Shipley - Millers MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

F42B 5/02

US Classification:

102439, 102430

Abstract:

A telescoped ammunition cartridge assembly including a case having a front end and a base end positioned along a longitudinal axis. A projectile is positioned along the longitudinal axis towards the front end of the case. An endcap is coupled to the front end of the case and is adapted to retain the projectile entirely within the case. A primer is positioned along the longitudinal axis towards the base end of the case. A primer support is coupled to the base end of the case and is adapted to support the primer within the case. The cartridge assembly includes at least one obturating lip seal to seal at least one of the endcap or the primer support to the case.

US Patent:

55734847, Nov 12, 1996

Filed:

Feb 27, 1995

Appl. No.:

8/394892

Inventors:

David P. Carpenter - Dunkirk MD

International Classification:

A63B 21072

US Classification:

482108

Abstract:

An auxiliary handle for a dumbbell includes a pair of weighted hook members each joined to a handle by a threaded stud. The hook members are adapted to engage the handle of a dumbbell. The studs are oppositely threaded so that rotation of the handle in one direction moves the hook members away from each other and into engagement with the dumbbell weights, thus securing the auxiliary handle to the dumbbell. The auxiliary handle may be used by a spotter to assist in handling the dumbbell.

US Patent:

54156076, May 16, 1995

Filed:

Sep 24, 1993

Appl. No.:

8/125751

Inventors:

David P. Carpenter - Dunkirk MD

International Classification:

A63B 21072

US Classification:

482106

Abstract:

An exercise device is shown formed from a weight having a C-shaped cross-section with an inner diameter large enough to fit over and at least partially about the bar of a dumbbell. In the preferred embodiment, a pair of weights are joined by a hinge to permit them to open about the bar and to then close upon it.

US Patent:

50887319, Feb 18, 1992

Filed:

Oct 29, 1990

Appl. No.:

7/605990

Inventors:

David P. Carpenter - Dunkirk MD

International Classification:

A63B 2304
A61H 102

US Classification:

272131

Abstract:

An arm exercise machine is shown having a housing with a pivot mechanism therein. Extending from the housing are first and second braces which extend in opposite directions with the pivot there between. A pivot rod is attached to the pivot mechanism and may be rotated about that mechanism by a user grasping the pivot rod. During such rotation, the first and second braces support the housing and counteract the user's rotation.

US Patent:

47186640, Jan 12, 1988

Filed:

Jun 19, 1985

Appl. No.:

6/746630

Inventors:

David P. Carpenter - Fort Washington MD

Assignee:

M. Michael Carpenter - Tarzana CA

International Classification:

A63B 2100

US Classification:

272130

Abstract:

A portable, light weight exercise machine is shown that includes a housing for carriage and storage of various parts which make up the machine. To use the machine, it is placed upon a table and the parts removed from the housing. A resistance device which forms a the major component of the machine is placed into its operating position by rotating a pivot head 180 degrees without the need to assemble or disassemble any parts. Once the resistance device is placed into its operating position, a lever is attached to the pivot head which the user may hold or attach to his or her ankles to exercise his or her upper or lower body while sitting upon the housing to retain it upon the table.

US Patent:

57715408, Jun 30, 1998

Filed:

Jan 22, 1997

Appl. No.:

8/785927

Inventors:

David A. Carpenter - Clarksville MD
Mikhail Gelfand - Milford CT
Edward T. Rude - Columbia MD

Assignee:

TorqMaster, Inc. - Stamford CT

International Classification:

E05F 108

US Classification:

16308

Abstract:

A hinge that provides equilibration and variable friction for a display screen or a laptop lid. In the preferred embodiment, a torsion rod provides a restoring force which increases as the lid is moved either direction from its vertical position. A friction hinge, of well know design, uses a spring band about a shaft. One end of the torsion rod is coupled to the end of the band of the friction hinge, so that the moment in the torsion rod increases or decreases the moment in the spring band of the hinge, modifying the frictional torque accordingly. This allows the frictional torque to be low as the lid is first opened, and larger as the display reaches the useful range of its motion.