Frederick Foster Hunt

US Patent:

62006789, Mar 13, 2001

Filed:

Jun 6, 1995

Appl. No.:

8/470415

Inventors:

Frederick F. Hunt - Jacksonville FL
Donald J. Gillette - Guilford CT

Assignee:

Florida Wire & Cable, Inc. - Jacksonville FL

International Classification:

E04C 500
D07B 100

US Classification:

428371

Abstract:

Concrete strengthening members, particularly prestressing tendons such as strands of steel wire, are provided with a strongly adherent plastic coating which may be substantially impermeable for improved corrosion resistance, and/or which may have embedded therein abrasive or grit-form particles to provide improved bond with the concrete, and particularly to provide controllable bond transfer in prestressing tendons of the pre-tensioned type. The plastic coating preferably is applied electrostatically in powder form, and fusion bonded by heat. The abrasive can be applied by spraying during a viscous state of the heated resin, and can be varied as to size and spacing density so as to control the surface condition and the bonding effect. Fusion and curing heat may come from preheating of the member before application of the resin powder, which preferably is a heat curable, thermosetting epoxy. Coating thickness and grit application are readily variable to meet particular requirements.

US Patent:

41211243, Oct 17, 1978

Filed:

Jul 26, 1976

Appl. No.:

5/709008

Inventors:

Frederick C. Hunt - Aurora OH

International Classification:

H02H 3302

US Classification:

310 13

Abstract:

An electrodynamic force generator or vibrator employing plural ring permanent magnets and a round magnetic structure of the center gap type that is split on a horizontal plane passing through the center and a support and guidance system for supporting the vibratory table and coil consisting of a plurality of horizontal damped cantilever springs joined to "C" shaped damped compensating springs. Typically, a round drive coil of plural turns surrounds a central core or pole of the magnetic structure and is influenced by flux on all sides. Shorted turn coils surround the drive coil and are stationary upon the outer pole to provide reduction of inductance. The drive coil is attached to a table structure which is supported and guided in the magnet structure. The support and guidance system for the table and drive coil of the force generator consists of three or more sets of horizontal damped cantilever springs joined to a like number of "C" shaped essentially vertical damped springs which compensate for the shortening effect of the horizontal spring during long excursion of the table of the force generator.