Adjustable framing tool for laying out hip and valley rafters

Details Adjustable framing tool for laying out hip and valley rafters Adjustable framing tool for laying out hip and valley rafters

2007-12-07

2008-10-21

Guadalupe-McCall, Yaritza (Department: 2841)

Geometrical instruments

Straightedge type

Multiplane angularly adjustable

C033S423000

Reexamination Certificate

active

07437826

ABSTRACT:
An adjustable framing tool10for laying out hip and valley rafters216. A planar body12has a measuring edge14and first and second scribing edges16,18disposed at right angles to the measuring edge. An arm assembly20comprising first and second parallel arms22,24disposed on opposite sides of the planar body is rotatably mounted on the planar body. The arm assembly extends across an arcuate slot40in the planar body centered on the pivot of the arm assembly. A thumb screw42selectively positions the arm assembly at any rotational position. The measuring edge is numbered in increments from 0 to 12, the length of the measuring edge being equal to 12 times the secant of the angle c formed by the hip or valley rafter218with the nearest common rafter208. The slot is numbered in increments expressed as the pitch of the main roof202.

REFERENCES:
patent: 1821103 (1931-09-01), Luginbuhl
patent: 5419053 (1995-05-01), Kathan
patent: 6314652 (2001-11-01), English

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