Spiral staircase and connecting metals for spiral staircase
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 16, 1999
Grant Date -
N/A
app pub date -
Jul 15, 1997
filing date -
Nov 23, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spiral staircase includes a shaft pole for the staircase, a plurality of arms spirally connected to the outer periphery of the shaft pole, treads fixed to the upper surface of each arm, a plurality of balusters fixed to the outside end portion of a plurality of arms in parallel with the shaft pole, and a plurality of handrails mounted and connected between the balusters pillars, wherein each of the arms is connected to the shaft pole by an arm connecting metal, each baluster is connected to each arm by a baluster connecting metal, and the baluster and the handrails are connected by a handrail connecting metal. Since the connecting metals are used for the connection between the shaft pole and the arms, between the arms and the balusters and between the balusters and the handrails, connection and assembly of the spiral staircase can be carried out easily, reliably and firmly without requiring skilled labor, and the cost of the production and high operation efficiency can be accomplished.
First Claim
Other Claims data not available