Title:
SPIRAL STAIRS
Document Type and Number:
Japanese Patent JP2023033015
Kind Code:
A
Abstract:
To provide spiral stairs having a step board with high strength while preventing an accident of falling to the outside.SOLUTION: Spiral stairs have a foundation 1, a support pole 2, a plurality of step boards 3 and a plurality of stringers 4. The support pole 2 is erected on the foundation 1. Each step board 3 is in a long plate-like shape, has an insertion hole penetrating in a thickness direction at one end in a longitudinal direction and has the support pole 2 inserted into the penetration hole. Each step board 3 is spirally arranged and shifted in the same rotational direction so that it is partially overlapped and supported each other from the lowest stage to the uppermost stage on the foundation 1. Each stringer 4 is erected on the foundation 1 and connects and supports the other end in the longitudinal direction of the plurality of step boards 3 arranged at an interval in a vertical direction.SELECTED DRAWING: Figure 1
Inventors:
AKITAYA YONEO
Application Number:
JP2021139448A
Publication Date:
March 09, 2023
Filing Date:
August 27, 2021
Export Citation:
Assignee:
COSMO SYSTEM KK
International Classes:
E01D19/02; E04F11/032
Attorney, Agent or Firm:
Atsushi Suda
Previous Patent: How to simulate odor diffusion
Next Patent: Cages for rolling bearings and rolling bearings
Next Patent: Cages for rolling bearings and rolling bearings