David J Schroepfer

US Patent:

6666525, Dec 23, 2003

Filed:

Jun 17, 2002

Appl. No.:

10/173086

Inventors:

David J. Schroepfer - Trinidad CO 81082

International Classification:

B60B 100

US Classification:

301 80, 301104, 3011105, 301 58

Abstract:

The spoked wheel apparatus is symmetrical, is reversible, employs spokes that are threaded on both ends, and is capable of supporting a tubeless tire, without air leaking from the tire. A hub assembly for the wheel apparatus includes two sides, and each side includes a plurality of alternately crossing spokes that are connected between the hub assembly and a wheel rim portion. Each hub side includes an interchangeable and reversible drive dowel assembly capable of receiving a drive sprocket or disc brake. For a hub side, some spokes are connected between outer portions of the hub side to the wheel rim portion, and some spokes are connected between inner portions of the hub side to the wheel rim portion. Alternating pairs of inner and outer spokes come into interference contact midway between the hub assembly and the wheel rim portion, whereby strengthening and stabilizing effects are provided between the interfering spokes.

US Patent:

20040025977, Feb 12, 2004

Filed:

Aug 7, 2002

Appl. No.:

10/215499

Inventors:

David Schroepfer - Trinidad CO, US

International Classification:

C22F001/04

US Classification:

148/524000

Abstract:

Generally, a wheel rim production method in accordance with the invention includes the steps of obtaining a length of extruded heat treatable metal alloy, preferably aluminum alloy, that has a cross-section of a wheel rim; heat treating the length of heat treatable metal alloy; winding or otherwise shaping the heat-treated length of metal alloy into a ring, leaving free ends in the ring forming a ring gap between the free ends; preparing the free ends of the ring for providing mating surfaces for welding; welding the mating surfaces of the ring, preferably using electron beam welding, to form a completed wheel rim; and finishing the completed wheel rim to achieve desired wheel rim parameters. In accordance additional aspects of the invention, additional steps can be carried out prior to obtaining a length of extruded heat treatable metal alloy that has a cross-section of a wheel rim.

US Patent:

20060090341, May 4, 2006

Filed:

Oct 30, 2004

Appl. No.:

10/977903

Inventors:

David Schroepfer - Trinidad CO, US

International Classification:

B21D 53/26

US Classification:

029894340

Abstract:

A solid forged cylindrical ring with no welds is machined to form a cycle wheel rim for a spoked wheel. Holes are drilled in the inner perimeter of the rim to receive spokes from the hub. This process can produce rims used an many other forms of wheel assemblies.

US Patent:

20060225794, Oct 12, 2006

Filed:

Apr 6, 2006

Appl. No.:

11/278868

Inventors:

Robert REINICKE - Mission Viejo CA, US
David SCHROEPFER - Trinidad CO, US

Assignee:

Circle Seal Controls, Inc. - Corona CA

International Classification:

F16K 5/10

US Classification:

137614170

Abstract:

A vent and relief valve having a valve body that is in fluid communication with the interior of a tank containing a fluid. A vent valve and relief valve are positioned within the valve body. The vent valve is capable of being configured into an open position to vent fluid from the interior of the tank. The relief valve is capable of being configured into an open position to relieve pressure within a tank. The relief valve is also capable of engaging the vent valve to form a seal to substantially prevent fluid from flowing from the tank. The valve body also includes a valve seat having a first surface that releasably engages the vent valve when the vent valve is in a closed position and a second surface that releasably engages the relief valve when the relief valve is in a closed position.

US Patent:

20070215833, Sep 20, 2007

Filed:

Mar 17, 2006

Appl. No.:

11/378039

Inventors:

Robert Reinicke - Mission Viejo CA, US
David Schroepfer - Trinidad CO, US

Assignee:

CIRCOR INTERNATIONAL, INC. - Burlington MA

International Classification:

F16K 1/18

US Classification:

251294000, 251298000

Abstract:

A valve for controlling the flow of cryogenic fluid. The valve includes a valve body and a sealing member pivotably mounted within the valve body. The valve also includes an actuator mechanism that pivots the sealing member from a closed position to an open position to allow flow of fluid through the valve body. The sealing member provides a seal against a portion of said valve body to substantially prevent flow of fluid through the valve in the closed position. A linkage connects the sealing member and the actuator mechanism. The linkage is capable of translating the direction of a force from the actuator mechanism to a direction suitable for pivoting the sealing member toward either the open position or the closed position.