Paul R Jacobs

US Patent:

49097032, Mar 20, 1990

Filed:

Dec 2, 1988

Appl. No.:

7/279023

Inventors:

Paul R. Jacobs - Corcoran MN

International Classification:

F03D 704

US Classification:

416 89

Abstract:

A multi-blade, variable pitch wind driven propeller in which a shock absorber is connected with each blade to dampen movement in both the radially inward and radially outward movements of the blade. Tension springs are connected with the blades to move them inwardly against centrifugal force, and in a preferred form of the invention, the tension spring has a variable rate so that it exerts greater resistance near its limit of outward travel. A coil compression spring may also be connected with each blade to absorb loads at the inner limit of travel of the blade and to impart an initial impetus to outward movement of the blade. In addition, retrofit lock nut means is provided for attachment to the ball stud connected to the butt end of each blade to extend along substantially the entire length of the stud and achieve a ratio of ball stud diameter, in inches, to rotor radius, in feet, of least as much as 0. 100, thereby minimizing the risk of failure of the stud.

US Patent:

46840133, Aug 4, 1987

Filed:

Apr 24, 1986

Appl. No.:

6/858565

Inventors:

Paul J. Jacobs - Moundsview MN

Assignee:

T. O. Plastics, Inc. - Minneapolis MN

International Classification:

B65D 8550
B65D 134

US Classification:

206423

Abstract:

A thin relatively stiff but somewhat resilient sheet of plastic material is formed into a series of aligned, identically-shaped and dimensioned cavities for holding thin-walled plastic flower pots with the cavities having ribs formed on their inside surfaces and hand-access cutouts in their side walls. As an added feature, a skirt or flange for lifting and carrying the tray is provided and suitable drain holes may also be provided.