Richard R Koehn

US Patent:

43691536, Jan 18, 1983

Filed:

Apr 27, 1981

Appl. No.:

6/257781

Inventors:

Richard C. Nash - New Prague MN
David W. Hanson - Golden Valley MN
Richard R. Koehn - Prior Lake MN

Assignee:

Fabcon, Inc. - Savage MN

International Classification:

B29D 702

US Classification:

264 62

Abstract:

A machine for casting concrete panels. The machine disclosed casts hollow core concrete panels in a single casting operation utilizing a slipform technique to fill cores with core material which can be dumped from the core after curing of the concrete has been accomplished. Vibration of the slipform during casting facilitates free flow of concrete around the slipform and core material extruded from slipforms. The slipform has a closed front portion which is tapered to a reduced cross section. The machine utilizes a casting pallet employing improved side form cleaning apparatus. The machine also includes improved finishing screeds for applying decorative three-dimensional finishes on the top surface of cast panels.

US Patent:

D2725177, Feb 7, 1984

Filed:

Jun 15, 1981

Appl. No.:

6/273476

Inventors:

Richard R. Koehn - Prior Lake MN

Assignee:

Fabcon, Inc. - Savage MN

International Classification:

D0808
D0806
D2599

US Classification:

D 8349

US Patent:

46447270, Feb 24, 1987

Filed:

Feb 4, 1986

Appl. No.:

6/825852

Inventors:

David W. Hanson - Golden Valley MN
Richard R. Koehn - Prior Lake MN
Richard C. Nash - New Prague MN
Lonnie G. Fox - Burnsville MN

Assignee:

Fabcon, Inc. - Savage MN

International Classification:

E04C 516

US Classification:

52687

Abstract:

The chairs include a lower chair portion for supporting multiple prestressing cables at the bottom of a plank and a narrow upper chair portion for supporting an upper prestressing cable located in the web between the hollow cores of the prestressed plank. The upper chair portion can be inserted into the strand receiving cups of the lower portion to form a structurally sound support for accurately placing the top and bottom reinforcing strands in the plank as it is cast.

US Patent:

43987613, Aug 16, 1983

Filed:

Aug 3, 1981

Appl. No.:

6/289712

Inventors:

David W. Hanson - Golden Valley MN
Richard C. Nash - New Prague MN
Richard R. Koehn - Prior Lake MN

Assignee:

Fabcon, Incorporated - Savage MN

International Classification:

B66C 142

US Classification:

294 81R

Abstract:

A device for both lifting and dumping of core material from long hollow core concrete panels. The device utilizes a pair of retractable clamp members to engage the longitudinal groove in the side of the panel.

US Patent:

44576820, Jul 3, 1984

Filed:

Jan 14, 1983

Appl. No.:

6/458016

Inventors:

Richard C. Nash - New Prague MN
David W. Hanson - Golden Valley MN
Richard R. Koehn - Prior Lake MN

Assignee:

Fabcon, Inc. - Savage MN

International Classification:

B29C 1100

US Classification:

425219

Abstract:

A machine for casting concrete panels. The machine disclosed casts hollow core concrete panels in a single casting operation utilizing a slipform technique to fill cores with core material which can be dumped from the core after curing of the concrete has been accomplished. Vibration of the slipform during casting facilitates free flow of concrete around the slipform and core material extruded from slipforms. The slipfom has a closed front portion which is tapered to a reduced cross section. The machine utilizes a casting pallet employing improved side form cleaning apparatus. The machine also includes improved finishing screeds for applying decorative three-dimensional finishes on the top surface of cast panels.