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Stair system with expandable center

Inactive Publication Date: 2005-12-29
SORENSON ROBERT E JR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] Another object of the present invention is to reduce the assembling complexity of the system.
[0012] It is yet another object of the p

Problems solved by technology

A major cost portion of any construction project, whether residential, commercial, or industrial, is that of stair construction.
These craftsmen are necessary whether building one stair or multiple stairs of the same design, because of the small variations between floor heights, and floors may lead to a not so perfectly level or square.
Considering various aspects this system is limited in many ways as pivotable blocks make the assembly bulky and costly without added benefit addi

Method used

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  • Stair system with expandable center
  • Stair system with expandable center
  • Stair system with expandable center

Examples

Experimental program
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Example

REFERENCE NUMERALS

[0027]20 . . . outer stringer [0028]25 . . . central stringer [0029]31 . . . riser [0030]32 . . . tread [0031]33 . . . corner bend [0032]34 . . . lip [0033]35 . . . bolt hole [0034]36 . . . handrail aperture [0035]37 . . . lap seam [0036]41 . . . handrail post [0037]42 . . . post receptacle [0038]43 . . . bracket [0039]44 . . . handrail system [0040]46 . . . first projecting structure [0041]48 . . . receiving grove [0042]50 . . . second projecting structure

DETAILED DESCRIPTION OF THE DRAWINGS

[0043] A further understanding of the present invention may be obtained with reference to the following description taken in conjunction with the accompanying drawings. However, the embodiments used for describing the invention are illustrative only and no way limiting scope of the invention. A person skilled in the art will appreciate that many more embodiments of the invention are possible without deviating from the basic concept of the invention any such embodiment will f...

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PUM

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Abstract

A staircase assembly comprising a plurality of stringers, and; a plurality of stair units, having treads and risers wherein stair unit is secured by means of fastening means on each corner to said plurality of stringers, said stringers, having a diagonally shaped series of equally spaced substantially vertical structure notched out of one side to define the length and height of each step of the stair assembly. The said tread,-forming a channel by rolling the leading edge for holding the riser of the stair unit installed immediately below, and each stair unit is secured by means of fastening means on each corner to said plurality of stringers, said channels further engaging other stair unit laterally sliding for providing horizontal adjustability.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from the provisional application No. 60 / 583,203 filed on Jun. 28, 2004. The applicant filed a disclosure document on 12 Sep. 2003; Ser. No. 541,502.STATEMENT REGARDING COPYRIGHTED MATERIAL [0002] Portions of the disclosure of this patent document contain material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the Patent and Trademark Office file or records, but otherwise reserves all copyright rights whatsoever. FIELD OF INVENTION [0003] This invention generally relates to a staircase system, more specifically to an adjustable staircase system and, still more precisely to a staircase system with expandable center that is easily and quickly built, cost effective and is safe to be installed by an average worker. BACKGROUND OF THE INVENTION [0004] A major cost portion of an...

Claims

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Application Information

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IPC IPC(8): E04F11/00E04F11/025E04F11/18E04F19/10
CPCE04F11/025E04F11/1041E04F11/1812
Inventor SORENSON, ROBERT E. JR.
Owner SORENSON ROBERT E JR
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