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US 4,599,805 AGranted
Transmutable rule
OwnerAmando C. Padillainventor
Life of this patent
Estimating the term…
Abstract
A pair of simple rules, each having a body portion identical with a standard rule and a head at one end cooperating with the other rule, for placing the two rules in an arrangement forming a T-square, and enabling one to be moved or slid along the other. A modified form includes means for releasably binding the two rules together in set position.
Claims4
A transmutable rule comprising,
- a pair of individual rules,
- each individual rule having scales along its side edges and each having a longitudinal slot therein extending nearly, but not entirely, its full length, and
- each individual rule including guide means at one end engageable in the slot of the other individual rule in interfitting relation in which the individual rules are mutually perpendicular, and relatively slideable, and remain in said perpendicular relation throughout their sliding movement, each guide means being resiliently attached to a respective one of said rules,
- each rule having mutually opposed gripping elements, one of which is on the guide means thereof, so positioned that when the guide means of one rule is in the slot of the other, said opposed gripping elements frictionally engage a structural element of the other rule;
- and the guide means, through the resiliency thereof, effects yieldable frictional gripping by said opposed gripping elements on the other rule, in the absence of positive locking.
2 more elements
Dependencies are inferred from the claim text.