David Lee Witcher

US Patent:

6932537, Aug 23, 2005

Filed:

Aug 10, 2004

Appl. No.:

10/914098

Inventors:

David L. Witcher - Salisbury NC, US

International Classification:

E01F015/00

US Classification:

404 6, 404 10

Abstract:

A modular energy absorbing soft wall system consisting of a plurality of partially overlapping interlocking panel structures slidably mounted on anchors on the side surface of an elongated concrete roadway barrier or median. Each panel consists of a flexible core layer sandwiched between an front and rear high density plastic layer. The core layer consists of a plurality of vertically extending air chambers. An elongated top piece with a flat bottom and an arched top is secured to the top portion of the core layer. The bottom portion of the system rests upon intermittent supports which extend to the road surface. During a vehicular impact energy is absorbed when the plastic layers deform, the chambers collapse, and the trapped air in the chambers escape out apertures in the inner plastic layer and through the bottom of the rubber layer.

US Patent:

20030095834, May 22, 2003

Filed:

Oct 24, 2002

Appl. No.:

10/278925

Inventors:

David Witcher - Salisbury NC, US

International Classification:

E01F013/00

US Classification:

404/006000

Abstract:

A modular energy absorbing soft wall system consisting of a plurality of partially overlapping interlocking panel structures slidably mounted on anchors on the side surface of an elongated concrete roadway barrier or median. Each panel consists of a flexible core layer sandwiched between an front and rear high density plastic layer. The core layer consists of a plurality of vertically extending air chambers. An elongated top piece with a flat bottom and an arched top is secured to the top portion of the core layer. The bottom portion of the system rests upon intermittent supports which extend to the road surface. During a vehicular impact energy is absorbed when the plastic layers deform, the chambers collapse, and the trapped air in the chambers escapes out apertures in the inner plastic layer and through the bottom of the rubber layer.

US Patent:

20130174331, Jul 11, 2013

Filed:

Dec 20, 2012

Appl. No.:

13/721186

Inventors:

David L. Witcher - Southport NC, US

Assignee:

Michcar Partners, LLC - Bingham Farms MI

International Classification:

A42B 3/12

US Classification:

2413

Abstract:

A protective helmet includes an outer shell and a controlled air dissipation (CAD) assembly installed within the outer shell. The CAD assembly includes an inner shell liner releaseably mounted to the outer shell, a primary bellows unit disposed between an outer surface of the inner shell liner and the inside surface of the outer shell, and a secondary bellows unit disposed between an inner surface of the inner shell liner and the head of a person wearing the protective helmet.

US Patent:

20150359287, Dec 17, 2015

Filed:

Aug 24, 2015

Appl. No.:

14/833448

Inventors:

- Bingham Farms MI, US
David L. Witcher - Oak Island NC, US

International Classification:

A42B 3/12

Abstract:

A protective helmet includes an outer shell and a controlled air dissipation (CAD) assembly installed within the outer shell. The CAD assembly includes an inner shell liner releaseably mounted to the outer shell, a primary bellows unit disposed between an outer surface of the inner shell liner and the inside surface of the outer shell, and a secondary bellows unit disposed between an inner surface of the inner shell liner and the head of a person wearing the protective helmet.

US Patent:

20140123371, May 8, 2014

Filed:

Jan 10, 2014

Appl. No.:

14/152490

Inventors:

- Bingham Farms MI, US
David L. Witcher - Oak Island NC, US

International Classification:

A42B 3/12

US Classification:

2413

Abstract:

A protective helmet includes an outer shell and a controlled air dissipation (CAD) assembly installed within the outer shell. The CAD assembly includes an inner shell liner releasably mounted to the outer shell, a primary bellows unit disposed between an outer surface of the inner shell liner and the inside surface of the outer shell, and a secondary bellows unit disposed between an inner surface of the inner shell liner and the head of a person wearing the protective helmet. The primary bellows unit and the secondary bellows unit are thermally bonded to respective outer and inner surfaces of the inner shell liner.