Title:
SPIRAL STAIRCASE
Document Type and Number:
Japanese Patent JPS54139222
Kind Code:
A
Abstract:
This invention relates to improvements in or relating to outdoor spiral stairs comprising a column of galvanized pipe, a plurality of footstep means fixed with the column to a spiral direction and supporting means having a U-shaped bolt and nuts. Unlike the conventional welding and drilling method, a plurality of footstep means are firmly fixed with the column by clamping the supporting means by the U-shaped bolt and nuts.
Inventors:
TAKENAGA YOSHIROU
Application Number:
JP4587678A
Publication Date:
October 29, 1979
Filing Date:
April 20, 1978
Export Citation:
Assignee:
AKEBONO KIKAI KK
International Classes:
E04F11/02; E04F11/032; (IPC1-7): E04F11/02
Domestic Patent References:
| JPS52155826A | 1977-12-24 | |||
| JPS52151220A | 1977-12-15 | |||
| JP48060315B |