Donald C Tolefson

US Patent:

D3671844, Feb 20, 1996

Filed:

Oct 7, 1994

Appl. No.:

D/029528

Inventors:

Donald C. Tolefson - Gloucester VA

US Classification:

D 6337

US Patent:

D3763382, Dec 10, 1996

Filed:

Oct 7, 1994

Appl. No.:

D/029527

Inventors:

Donald C. Tolefson - Gloucester VA

US Classification:

D12114

US Patent:

D3976424, Sep 1, 1998

Filed:

Apr 3, 1997

Appl. No.:

D/069901

Inventors:

Donald C. Tolefson - Gloucester VA

International Classification:

1211

US Classification:

D12114

US Patent:

51409275, Aug 25, 1992

Filed:

Jan 2, 1991

Appl. No.:

7/636691

Inventors:

Donald C. Tolefson - Gloucester VA

Assignee:

Motion Technology - Hampton VA

International Classification:

B63H 2166

US Classification:

114244

Abstract:

A motion compensation and tension control system (MCATS) for a surface vessel overboarding, umbilical cable supported, submersible payload is provided with a housing containing a pair of spaced parallel guide rods attached to oppositely disposed housing end plates. Two identical carriages, slidably disposed on the pair of guide rods, each include two parallel slide tubes rigidly attached by a cross plate and by an axle, with a plurality of sheaves rotatably supported by each axle. Motion of each carriage as a rigid body along the guide rods is elastically restrained by, either extension or compression springs. The surface vessel umbilical cable is received through an opening in one of the end plates, reeved around the two sets of sheaves, and mechanically connected to the other end plate. Wave induced surface vessel motion is transmitted through the umbilical cable and absorbed, or compensated for, by the spring restrained carriage motion before it reaches the submersible payload. Suitable electrical and/or optical connections between the surface vessel and the payload may be made through the umbilical cable.

US Patent:

D4100972, May 18, 1999

Filed:

Sep 4, 1996

Appl. No.:

D/059191

Inventors:

Donald C. Tolefson - Gloucester VA

International Classification:

2606

US Classification:

D26 28