Dale A Lehman

US Patent:

6457940, Oct 1, 2002

Filed:

Jul 21, 2000

Appl. No.:

09/621201

Inventors:

Dale T. Lehman - Solon OH 44139

International Classification:

F04D 706

US Classification:

415206, 298894, 4151212, 416235

Abstract:

An impeller for a molten metal pump includes an exterior bearing mounting surface that is trued about the axis of the impeller and drive shaft assembly. Another impeller arrangement includes a pumping chamber having an axis offset from the impeller axis to achieve a volute pumping arrangement. In a further arrangement, the impeller is provided with peripheral pumping chambers intersecting the peripheral surface of the impeller. In each of the foregoing arrangements, a plate may be fixed to the pump drive shaft at a location axially spaced from the impeller inlet to screen debris and to pump molten metal to the impeller inlet.

US Patent:

6468039, Oct 22, 2002

Filed:

May 25, 2001

Appl. No.:

09/865772

Inventors:

Dale T. Lehman - Solon OH 44139

International Classification:

F04D 2938

US Classification:

416181, 416185, 415200

Abstract:

An impeller for a molten metal pump includes a base and a plurality of vanes having openings for flow of molten metal there through during pumping, Alternatively, or in combination with the vane openings, a single drain opening extending through the base of the impeller may be provided remote of the rotational axis of the impeller. In another embodiment, an impeller provides axial and radial pumping. The multiflow impeller includes at least one pumping chamber inclined into the direction of rotation to provide axial pumping.

US Patent:

6562286, May 13, 2003

Filed:

Mar 13, 2001

Appl. No.:

09/804845

Inventors:

Dale T. Lehman - Solon OH 44139

International Classification:

C21B 712

US Classification:

266 45, 266239, 4174233

Abstract:

A molten metal pump includes a base member submerged in the molten metal, a support member supported above the level of the molten metal by a post extending from the base member through a clearance bore in the support member and a coupling securing the post to the support member. The coupling is mounted to the support surface and includes gripping members operable to a locked position engaging the upper end of the post and to an unlocked position releasing the post. The coupling is aligned with the clearance bore in the support member to permit the post to be assembled or disassembled by axial movement through the clearance bore when the coupling is in the unlocked position.

US Patent:

6755614, Jun 29, 2004

Filed:

Oct 16, 2002

Appl. No.:

10/272221

Inventors:

Dale T. Lehman - Solon OH 44139

International Classification:

F04D 706

US Classification:

415200, 416185, 416241 B

Abstract:

An impeller for a molten metal pump includes a base and a plurality of vanes having openings for flow of molten metal there through during pumping. Alternatively, or in combination with the vane openings, a single drain opening extending through the base of the impeller may be provided remote of the rotational axis of the impeller. In another embodiment, an impeller provides axial and radial pumping. The multiflow impeller includes at least one pumping chamber inclined into the direction of rotation to provide axial pumping.

US Patent:

6837678, Jan 4, 2005

Filed:

Sep 25, 2003

Appl. No.:

10/670537

Inventors:

Dale T. Lehman - Solon OH, US

International Classification:

F04D 2938

US Classification:

415181, 415200, 415185

Abstract:

An impeller for a molten metal pump includes a base and a plurality of vanes having openings for flow of molten metal there through during pumping. Alternatively, or in combination with the vane openings, a single drain opening extending through the base of the impeller may be provided remote of the rotational axis of the impeller. In another embodiment, an impeller provides axial and radial pumping. The multiflow impeller includes at least one pumping chamber inclined into the direction of rotation to provide axial pumping.

US Patent:

41191412, Oct 10, 1978

Filed:

May 12, 1977

Appl. No.:

5/796175

Inventors:

Bruno H. Thut - Bainbridge OH
Dale T. Lehman - Solon OH

International Classification:

F28F 902
F28F 2102

US Classification:

165 82

Abstract:

A heat exchanger comprising an elongated tubular cylindrical member having fluid ingress and egress openings adjacent to its opposite ends and external flanges at opposite ends one of which flanges has a counterbore facing in the direction away from the cylindrical member. A plurality of graphite tubes within the cylindrical member having their opposite ends connected to graphite headers one of which is connected through a graphite end member to one end of the cylindrical member and the other of which has an outside diameter slightly less than the inside diameter of the cylindrical member and within which it is slidable or floats. The floating header has an external circumferential groove with outwardly inclined ends. A seal is provided at the end of the cylindrical member at which the floating header is located which seal includes packing in the counterbore in the adjacent flange and a gland member slidable on the floating header and adjustable towards the flange. A part of the gland member overlies one end of the external groove in the floating header member.

US Patent:

42444233, Jan 13, 1981

Filed:

Jul 17, 1978

Appl. No.:

5/924912

Inventors:

Bruno H. Thut - Bainbridge OH
Dale T. Lehman - Solon OH

International Classification:

F28F 912

US Classification:

165 82

Abstract:

A heat exchanger comprising an elongated tubular cylindrical member having fluid ingress and egress openings adjacent to its opposite ends and external flanges at opposite ends one of which flanges has a counterbore facing in the direction away from the cylindrical member. A plurality of graphite tubes within the cylindrical member having their opposite ends connected to graphite headers one of which is connected through a graphite end member to one end of the cylindrical member and the other of which has an outside diameter slightly less than the inside diameter of the cylindrical member and within which it is slidable or floats. The floating header has an external circumferential groove with outwardly inclined ends. A seal is provided at the end of the cylindrical member at which the floating header is located which seal includes packing in the counterbore in the adjacent flange and a gland member slidable on the floating header and adjustable towards the flange. A part of the gland member overlies one end of the external groove in the floating header member.