Circular stairway and method of making same
OwnerDavid M. Weingarten, Lucia E. Howardinventors
Life of this patent
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Abstract
A circular stairway and method of making same, including a helical newel formed by installing a cylindrical tube or pipe with its longitudinal axis concentric with the vertical axis about which the circular staircase is to wind. The treads are then affixed to the tube in either cantilever fashion or are bridged between the tube and an outer wall. The tube is subsequently cut along helically extending lines disposed beneath the tread line and at approximately the handrail elevation. The tube material between these lines is then removed to leave a helically extending ribbon of tube material forming the tread supporting helical newel. As an alternative, the several components of the stairway can be pre-fabricated and transported to a site for assembly.
Claims16
A circular staircase comprising:
- a helical newel including a ribbon-like member cut from a tube having a longitudinal axis and a diameter of at least 2'6", said ribbon-like member being helical in configuration, rigidly attached to a support structure and having an axis of revolution lying along a vertical line normal to a horizontal base;
- and
- a plurality of stair treads affixed to said ribbon-like member and extending radially outwardly relative to said axis of revolution, said stair treads being disposed at regular increments along said ribbon-like member.
A method of making a circular staircase comprising the steps of:
- mounting a length of first tube having a central axis and a diameter of at least 2'6" so that said central axis extends in a vertical direction;
- severing a strip of material from said tube leaving a generally helical first ribbon-like member forming a rigid helical newel;
- and
- affixing a plurality of stair treads to said ribbon-like member said stair treads extending radially away from said central axis.
Dependencies are inferred from the claim text.