Static structures (e.g. – buildings) – Stepped; e.g. – stair – Tread unit on horizontal tread member connected to riser
Patent
1999-02-03
2000-02-29
Friedman, Carl D.
Static structures (e.g., buildings)
Stepped; e.g., stair
Tread unit on horizontal tread member connected to riser
52182, 52183, 52191, E04F 1100
Patent
active
060294086
ABSTRACT:
The present invention is a prefabricated step and stairway system, where the prefabricated step is preferably a precast concrete step having an elongate body substantially triangular in cross-section having a first side as a tread, a second side as a riser adjacent the first side, and a third side, and the step further has a first and second end which preferably include an attachment member to attach the step between a pair of stringers. The attachment member is preferably integrated metal plates proximate to the first end and second end to facilitate attachment between a pair of stringers, and preferably includes one or more reinforcing members attached to the metal plates and integrated throughout the length of the body to strengthen the step. The prefabricated steps are rigidly secured either to intermediate runners between a pair of stringers, upon a brace, or directly to stringers to form a stairway. There is also provided an inventive mold for forming a precast concrete step preferably at remote locations to the installation site of the stairway.
REFERENCES:
patent: 3055146 (1962-09-01), Lobato
patent: 3814371 (1974-06-01), Locricchio
patent: 4951434 (1990-08-01), Schmidt
Cavaness Investment Corporation
Friedman Carl D.
Isaf Louis T.
Maddox Nkeisha J.
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