Thomas H Roth

US Patent:

7604434, Oct 20, 2009

Filed:

Oct 11, 2005

Appl. No.:

11/247842

Inventors:

Thomas L. Roth - Cincinnati OH, US

International Classification:

E01C 19/22

US Classification:

404112

Abstract:

An apparatus for leveling and smoothing a surface that permits blades to be easily installed and removed from their corresponding trowel arms. The blades are formed such that attachment of a blade to the trowel arm is achieved by simply attaching the blade using one or more threaded bolts. Further, the blades of the subject invention are formed without the need of riveting or welding operations thereby significantly decreasing the manufacturing time and expense of the blades.

US Patent:

62199315, Apr 24, 2001

Filed:

Mar 10, 1998

Appl. No.:

9/041080

Inventors:

Thomas H. Roth - Moreno Valley CA

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

G01B 500

US Classification:

33645

Abstract:

A target base (10) for attaching an apparatus (13) to an object (11) has a substantially rigid body (12) with a mount surface (14) adapted to couple the apparatus (13) to the body (12), and a base surface. A suction cup (46) affixed to the base surface (18) of the target base (10) has a suction cavity (62) defined by a deformable sealing lip (64) at the perimeter of the suction cup (46). The sealing lip (64) and suction cavity (62) form with the object (11) a vacuum chamber (66). A vacuum system (44) includes vacuum passages (50, 52) for communicating a vacuum pressure to the vacuum chamber (66). One or more contact members (60) are affixed to the body and have contact surfaces which engage the object (11) to provide consistent off-set positioning of the target base (10) with respect to the object (11).