Rodger D Pratt

US Patent:

45313970, Jul 30, 1985

Filed:

Dec 2, 1983

Appl. No.:

6/557334

Inventors:

Rodger Pratt - Kirkland WA

International Classification:

B21J 918

US Classification:

72451

Abstract:

This invention is directed to a power operated crimping tool having two movable links. On the lower end of one of the movable links there is a stud and on the lower end of the other movable link there is a recess. There is a power operated movable piston which operatively connects with a plunger. The plunger connects with toggles and in turn the toggles connect with an appropriate movable link. The operator can control the application of power to the power operated movable piston to move the pistons and thereby move the plunger and thereby move the toggles and the two movable links.

US Patent:

46717218, Jun 9, 1987

Filed:

Mar 12, 1984

Appl. No.:

6/588388

Inventors:

Rodger Pratt - Kirkland WA
Michael Sparling - Woodinville WA

International Classification:

B66C 100

US Classification:

414 10

Abstract:

This invention is directed to an apparatus for lifting objects. The apparatus is suspended from a cable which is attached to a crane. The apparatus is used in construction such as in the construction of buildings. The apparatus can connect with a precast concrete panel and lift the precast concrete panel to a desired opening in a building under construction. Also, the apparatus can lift building material to a desired opening in a building, to a proper location in a dam under construction, and to a tower under construction such as a high voltage electric line tower, a radio and television tower and the like. The crane can be on top of the article being constructed such as a building or a dam or the crane can be on the ground. The cable is suspended from the crane and attaches to the apparatus so that the position of the apparatus can be varied both horizontally and vertically and also away from the article under construction and toward the article under construction.

US Patent:

53122186, May 17, 1994

Filed:

Jun 9, 1992

Appl. No.:

7/895740

Inventors:

Rodger D. Pratt - Kirkland WA
Michael J. Sparling - Kirkland WA

International Classification:

B66C 122

US Classification:

414 10

Abstract:

Apparatus for lifting objects into preformed openings in buildings. These openings can be recessed. The apparatus has a frame which has a head section and a tail section. The head section and tail section are rotably mounted to each other. A backstand is provided which is attached to the head section for preventing the objects to be lifted from moving as the objects are transported. Supports or forks are also provided which protrude from the head section and are used to support the objects to the transported. The apparatus has a leveling system which includes movable counterweights attached to chains. The movable counterweights balance the effect of the objects that the apparatus supports, keeping it level in the horizontal direction. The backstand can be folded down into the head section and the tail section folded onto the head section. Prior to or after use, as the apparatus is a lightweight, compact system, it can be transported in a pickup truck.