Joints and connections – Articulated members – Lockable at fixed position
Patent
1991-10-23
1992-11-17
Kundrat, Andrew V.
Joints and connections
Articulated members
Lockable at fixed position
403359, 403380, F16C 1100
Patent
active
051637715
ABSTRACT:
Interlocking surface elements are created in such a way that there is almost 100% engagement between the surfaces, so that they positively lock together, and will not cam with respect to each other. Each element comprises a number of uniformly dimensioned semi-conically shaped surfaces emanating from a common center and disposed in an alternating inverted configuration. Each surface has first and second edges extending in a longitudinal direction. A flat surface of substantially constant dimension in a plane substantially perpendicular to the longitudinal direction connects the first and second edges of adjacent, alternately inverted, semi-conically shaped surfaces, so as to maximize the engagement area between the elements. The elements may be of vacuum formed plastic, molded plastic, or metal stampings. They may be circular (e.g. disc shaped) in plan, and the semi-conically shaped surfaces may all be hollow.
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patent: 1541007 (1925-06-01), Thiemer
patent: 1779805 (1930-10-01), Dunwoodie
patent: 3819402 (1989-04-01), Schneider
patent: 4620530 (1986-11-01), Lanier
patent: 4913135 (1990-04-01), Mattingly
Bremer Orthopedics Brochure "Halo Vest"; 1987.
Barr Randall A.
Bremer Paul W.
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