Gerard K Forsberg

US Patent:

51990059, Mar 30, 1993

Filed:

Aug 14, 1992

Appl. No.:

7/929233

Inventors:

Gerard K. Forsberg - Lauderdale Lakes FL

Assignee:

Argotec, Inc. - Ft. Lauderdale FL

International Classification:

H04R 900

US Classification:

367175

Abstract:

A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is provided with reduced weight and high power by forming the electromagnetic assembly with a permanent magnet structure consisting of two coaxial longitudinally juxtaposed members each having permanent magnets radially poled oppositely to the permanent magnets of the other coaxial member, each of the permanent magnets of one coaxial member forming a series magnetic circuit with one of the permanent magnets of the other coaxial member. As a result of this arrangement, the amount of iron required for pole pieces of the electromagnetic assembly is reduced without reducing power. Furthermore, the size or volume is also reduced as compared to an equivalent projector.

US Patent:

50479970, Sep 10, 1991

Filed:

Jul 19, 1990

Appl. No.:

7/554401

Inventors:

Gerard K. Forsberg - Lauderdale Lakes FL

Assignee:

Argotec, Inc. - Ft. Lauderdale FL

International Classification:

G01V 138

US Classification:

367191

Abstract:

A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is rendered capable of operating at reduced resonant frequency by providing liquid mass loading for the pistons. The mass loading is achieved by utilizing a structure which constricts a body of liquid on one side of the piston. The constricted liquid may be sea water or a liquid sealed within the body of the unit. In accordance with a further aspect of the invention, a seal assembly is provided for the moving pistons which not only provides a sealing function but which also acts to radially center the pistons and to provide an axially directed restoring force thereto during piston oscillation. The electromagnetic assembly, in accordance with still a further aspect of the invention, is formed with a permanent magnet structure arranged in a cylindrical configuration with the opposed pistons on opposite axial ends thereof to reduce magnetic leakage losses.

US Patent:

50620894, Oct 29, 1991

Filed:

Nov 13, 1990

Appl. No.:

7/611729

Inventors:

Bernard Willard - Davie FL
Gerard K. Forsberg - Lauderdale Lakes FL

Assignee:

Argotec Inc. - Ft. Lauderdale FL

International Classification:

H04R 1500

US Classification:

367172

Abstract:

A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is rendered capable of operating at reduced resonant frequency by providing liquid mass loading for the pistons. The mass loading is achieved by utilizing a structure which constricts a body of liquid on one side of the piston. The constricted liquid may be sea water or liquid sealed within the body of the unit. In accordance with a further aspect of the invention, a seal assembly is provided for the moving pistons which not only provides a sealing function but which also acts to radially center the pistons and to provide an axially directed restoring force thereto during piston oscillation. The electromagnetic assembly, in accordance with still a further aspect of the invention, is formed with a permanent magnet structure arranged in a cylindrical configuration with the opposed pistons on opposite axial ends thereof to reduce magnetic leakage losses.