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US 5,685,120 AGranted
Building system
OwnerKirpal Singh Sihrainventor
Life of this patent
Estimating the term…
Abstract
A building system has interlocking frame members which interengage to form a rectilinear frame. To prevent the interengaged frame members from disengaging, a lock element is associated with a joint between frame members. This lock element is a rotary lock with a trilobal locking surface. Additional locking capability can be provided by a lock ring or collar which surrounds a joint between two frame members and prevents unintentional disengagement.
Claims7
A building member having two opposite end regions connected by a neck, the neck having a cross-section which is a regular triangle with three convex sides;
- the sides meeting at apices which define three corners of the neck;
- and
- wherein the degree of convexity of two adjacent convex sides is such that if one corner of the neck is placed at an apex of an imaginary right angle, then the two adjacent convex sides of the triangle form tangents to lines defining that right angle.
Dependencies are inferred from the claim text.