Anthony E Angelucci

US Patent:

60983000, Aug 8, 2000

Filed:

Jun 25, 1998

Appl. No.:

9/104708

Inventors:

Anthony Angelucci - Philadelphia PA

International Classification:

G01C 926

US Classification:

33451

Abstract:

A level tool is arranged to facilitate gradient measurement and matching of lines on inclined surfaces, such as to establish parallel reference lines when installing roofing materials. The tool has a rule-like base member defining an elongated reference edge, and has a centrally located protrusion on its lower surface and a level on its upper surface for sensing orientation of the tool around an axis perpendicular to the base member and to the level. A plurality of resilient members depend from the protrusion and serve to stabilize the level tool when determining parallel lines. The level can have a fluid filled disk or circularly arched tube with a captive air bubble, and preferably is graduated to mark positions of the bubble. The tool is placed on the inclined surface so that the raised protrusion and at least one of the resilient members rests against the inclined surface and a reference edge is parallel to the plane of the surface and aligned to a pre-existing line to be matched with a parallel line. The protrusion and resilient members in combination avoid the influence of bumps in the surface and allows the tool to be rolled transversely to bring the reference edge near or against the pre-existing line while tilting the level to move the bubble radially outwardly.

US Patent:

58061975, Sep 15, 1998

Filed:

Dec 6, 1995

Appl. No.:

8/568246

Inventors:

Anthony Angelucci - Philadelphia PA

International Classification:

G01C 926

US Classification:

33451

Abstract:

A level tool is arranged to facilitate gradient measurement and matching of lines on inclined surfaces, such as to establish parallel reference lines when installing roofing materials. The tool has a rule-like base member defining an elongated reference edge, and has a centrally located protrusion on its lower surface and a level on its upper surface for sensing orientation of the tool around an axis perpendicular to the base member and to the level. The level can have a fluid filled disk or circularly arched tube with a captive air bubble, and preferably is graduated to mark positions of the bubble. The tool is placed on the inclined surface so that the raised protrusion rests against the inclined surface and a reference edge is parallel to the plane of the surface and aligned to a pre-existing line to be matched with a parallel line. The protrusion avoids the influence of bumps in the surface and allows the tool to be rolled transversely to bring the reference edge near or against the pre-existing line while tilting the level to move the bubble radially outwardly. The orientation of the tool is noted from the bubble position.