Frederick P Lewis

US Patent:

48941212, Jan 16, 1990

Filed:

Aug 26, 1988

Appl. No.:

7/244570

Inventors:

Oscar Luthi - Nashua NH
Frederick S. Lewis - Nashua NH
Lawrence A. Carlsmith - Amherst NH

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

D21C 902
D21C 906

US Classification:

162329

Abstract:

A method and apparatus for forming on the outside of a permeable, rotatable drum by feeding a pulp slurry through a mat forming and pressing zone, followed by a mat washing zone. In the mat washing zone, the mat is washed with liquid from the first source and then washed with liquid from a second source. A Washing baffle has a first portion extending from its upstream end partially along the outside surface of the drum and slightly spaced from the outside surface of the drum. This first portion is followed by a second portion extending partially along the outside surface of the drum and spaced further from the outside surface of the drum than the first portion. A valve is provided for controlling the velocity of liquid through a slot into a circumferential space separating the washing baffle from the drum.

US Patent:

48082651, Feb 28, 1989

Filed:

Nov 23, 1987

Appl. No.:

7/124167

Inventors:

Oscar Luthi - Nashua NH
Frederick S. Lewis - Nashua NH
Lawrence A. Carlsmith - Amherst NH

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

D21C 902
D21C 906

US Classification:

162 60

Abstract:

A pulp mat is formed on the outside of a permeable, rotatable drum by feeding a pulp slurry through a mat forming and pressing zone, followed by a mat washing zone. In the mat washing zone, the mat is washed with liquid from a first source and then washed with liquid from a second source. A washing baffle has a first portion extending from its upstream end partially along the outside surface of the drum and slightly spaced from the outside surface of the drum. This first portion is followed by a second portion extending partially along the outside surface of the drum and spaced further from the outside surface of the drum than the first portion.

US Patent:

46434399, Feb 17, 1987

Filed:

Oct 2, 1985

Appl. No.:

6/783176

Inventors:

Frederick Lewis - Nashua NH
Robert W. Munson - Pelham NH

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

F16J 1532

US Classification:

277 95

Abstract:

The external seal is mounted on a housing about a rotary shaft projecting through an opening in the housing. The seal is a resilient, flexible member having a generally tubular body portion with an annular lip extending radially outwardly from one end of the body portion and a flange extending radially outwardly from the other end of the body portion. The lip extends into a sealing chamber formed by the outside of the housing and a replaceable sealing member which has an inside surface spaced from and parallel to the outside of the housing. The tubular portion of the seal extends through an annulus formed by the shaft and the replaceable member. The outwardly extending flange is used to prevent the clamp holding the seal to the shaft from falling out.

US Patent:

54805457, Jan 2, 1996

Filed:

Aug 3, 1994

Appl. No.:

8/285462

Inventors:

Frederick S. Lewis - Nashua NH

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

B01D 3306

US Classification:

2103803

Abstract:

A washer drum is provided with unique cross bracing which prevents twisting, reduces vortex formation in radial inflow ports, and further provides support for the decking between closely spaced intermediate heads.

US Patent:

52813436, Jan 25, 1994

Filed:

Apr 20, 1993

Appl. No.:

8/048222

Inventors:

Frederick S. Lewis - Nashua NH
Lewis F. Empie - Amherst NH
Rollin E. Brown - Nashua NH

Assignee:

Ingersoll-Rand Company - Woodcliff Lake NJ

International Classification:

B01D 3309

US Classification:

210784

Abstract:

A method and apparatus for filtering pulp fibers from a pulp slurry, using a combination of vacuum, hydrodynamic and hydrostatic forces in order to achieve a more effective deposition of pulp fibers onto the filter surface and enhanced flow of filtrate through the cylinder. The apparatus is in the form of an improved vacuum filtration system, in which the filtrate outlet tube is disposed along the axis of rotation of the rotary cylinder and the filtrate inlet and outlet ports of each filtrate conduct are radially offset from one another in the direction of intended rotation of the cylinder. During various phases of filter operation, vacuum forces generated by the vacuum source cooperate with either hydrodynamically or hydrostatically generated forces, which together act upon columns of filtrate in the filtrate conduits as the cylinder rotates.