Static structures (e.g. – buildings) – Installed screed or unit with specified feature retaining... – Stonelike material base type; e.g. – concrete set
Patent
1977-06-29
1979-01-09
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Installed screed or unit with specified feature retaining...
Stonelike material base type; e.g., concrete set
52376, 52729, E04C 3292
Patent
active
041331559
ABSTRACT:
A joist structure having a configuration useful for constructing concrete-forming structures. The joist is comprised of an upwardly opening channel and an oppositely facing downwardly opening keyhole-shaped channel. The joist is an extruded elongate member having the respective channel end walls abutting each other. The upwardly facing channel has a generally rectangular form with the side walls being considerably wider than the end walls to accommodate standard wooden beam sizes, such as a 2 .times. 4. The downwardly facing channel, somewhat narrower and shorter than the upwardly facing channel, has a keyhole shape which considerably increases the compressive and torsion strength of the overall joist. The keyhole shape also accommodates keyhole-shaped inserts for strengthening the joist at high stress points, such as bearing surfaces and the mid-point between spans. The keyhole-shaped inserts can be provided in varying lengths according to the need and can incorporate mounting holes for the joist.
REFERENCES:
patent: 2182015 (1939-12-01), Davis
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