The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Feb. 10, 1986
Adolph E Goldfarb, Westlake Village, CA (US);
Delmar K Everitt, Morro Bay, CA (US);
Drew Plakos, Bloomington, MN (US);
Other;
Abstract
Pontoons along both sides of the vehicle can be filled with either air or water, at the user's preference. When the pontoons are filled with air the vehicle floats in water and is driven along the water surface by a propeller and also by a tread drive. When the pontoons are filled with water the vehicle sinks in water and is driven along the bottom by, again, the propeller and treads. In either event when the vehicle comes to a dry surface it continues to be driven along that surface by the treads. The pontoons are provided with a hole and plug for use in filling or draining them. Preferably the interior spaces of the pontoons communicate through a cross-connection chamber that rougly equalizes the amount of water in the two pontoons, so that the vehicle has minimal tendency to capsize or ride in the water at a cant. An unusual two-worm-and-worm-gear drive train provides power to the tread drivers both fore and aft with high mechanical advantage and very few moving parts. The worm gears slide laterally along the tread-driver axles under action of a manually manipulated shifter, to disengage the worm gears from the worms for free-wheeling unpowered play; the motor power is controlled by the same shifter.