Douglas P Roth

US Patent:

6408576, Jun 25, 2002

Filed:

Oct 20, 2000

Appl. No.:

09/693212

Inventors:

Douglas Roth - West Palm Beach FL 33417

International Classification:

E04G 1502

US Classification:

52 85, 52254, 52255, 522871, 249 48, 249209

Abstract:

Doorway or passageway arches and a mold and method for making doorway arches, wherein the arches comprise pre-fabricated plaster, two sides that are substantially perpendicular to each other, a concave arcuate side extending between the sides and flanges extending outward from each side for securing the arch to adjoining walls defining a comer, and the mold comprises a base, at least two perpendicularly disposed slots, at least one slidably insertable and removable board for each slot, a mold projecting upward from said base and having a convex side extending between opposing ends of said boards, flanges disposable along the boards and a volume for receiving a hardening agent, such as plaster.

US Patent:

20150040393, Feb 12, 2015

Filed:

Aug 7, 2013

Appl. No.:

13/961186

Inventors:

Yevgeniy Shteyman - West Palm Beach FL, US
Matthew R. Porter - West Palm Beach FL, US
Mrinal Munshi - Orlando FL, US
Douglas R. Roth - Oviedo FL, US

International Classification:

B23P 15/00
F01D 25/30

US Classification:

2988802

Abstract:

Manufacture of a gas turbine exhaust diffuser shell (A/B) to achieve a final cross-sectional shell geometry by forming an opening () in the shell to receive a strut shield collar (); forming a compensating outward bowing () of the shell around the opening that departs from a desired final shell geometry in an amount and shape that compensates for a welding shrinkage when welding the collar in the opening; and welding the collar in the opening. This produces the desired shell geometry after the welding. The collar may be welded proximate an edge () of the diffuser shell, such as along an intersection of an axial plane with the diffuser shell. A multi-bolt flange () may be welded to or otherwise formed along this edge for assembling an annular exhaust diffuser duct (A-B, A/B) in an exhaust section () of a gas turbine engine.

US Patent:

20150044039, Feb 12, 2015

Filed:

Aug 8, 2013

Appl. No.:

13/961920

Inventors:

Yevgeniy Shteyman - West Palm Beach FL, US
Matthew R. Porter - West Palm Beach FL, US
Mrinal Munshi - Orlando FL, US
Douglas R. Roth - Oviedo FL, US

International Classification:

F01D 25/30

US Classification:

415207, 2989008

Abstract:

Manufacture of an arcuate diffuser shell (A/B) assembled from an axially forward portion (A) and an axially aft portion (B), the two portions welded to respective sides of an arcuate flange (A) via two respective pairs of circumferential welds (A/B and A/B or and or and ). Each pair of welds comprises first and second welds on opposed surfaces () of the shell. The first and second welds compensate each other with respect to welding process shrinkage, eliminating weld warping () of the shell. The first and second welds may have equal cross sectional areas or equal masses over a circumferential span of the flange.

US Patent:

20150044046, Feb 12, 2015

Filed:

Aug 7, 2013

Appl. No.:

13/961029

Inventors:

Yevgeniy Shteyman - West Palm Beach FL, US
Matthew R. Porter - West Palm Beach FL, US
Mrinal Munshi - Orlando FL, US
Douglas R. Roth - Oviedo FL, US

International Classification:

F01D 25/08
B22D 31/00
B22D 25/02

US Classification:

416 95, 29888

Abstract:

A method for casting a collar () for a heat shield () of a strut () in a gas turbine exhaust section (). A casting geometry () is defined with extra wall thickness () in an area of wall curvature (), which provides a flow path beyond a final geometry of the collar to facilitate a flow of molten metal in the mold (). The extra thickness is removed after casting, leaving the collar in its final geometry, which may have uniform wall thickness (T, T2). The extra thickness in the casting geometry may be provided by increased radius (R3) in the wall curvature and/or by casting feed portals () that span the wall curvature between a tubular portion () and a flange () of the collar.