Stairway tread support device and system
OwnerKelly Kristian Kvolsinventor
Life of this patent
Estimating the term…
Abstract
A tread support device for stairways is generally triangular with two parts which pivot in relationship to one another to allow selection of any desired riser height. Precalculated groups of holes on each of the two parts overlap, with different sets of holes overlapping at different riser heights separated by different increments of ⅛ inch. An alignment guide allows easy selection of the desired riser height, after which the holes which are aligned and overlapping are fastened together to keep the device whole. A complete system consists of left-handed and right-handed tread support units, along with right and left handed units designed to meet the base of the steps with adjustable bolts. A stairway may be built using uncut stringers by use of the invention.
Claims14
A stairway tread support device for use on a set of stairs, the tread support device comprising:
- a pivot point;
- a first lower part, the lower part having a vertical fin;
- a second upper part, the upper part and the lower part pivoting relative to one another about the pivot point;
- a first riser height H measured at a first edge of the device distal from the pivot point, the riser height H having a plurality of values;
- a first plurality of holes passing through the fin of the lower part;
- a second plurality of holes passing through the upper part;
- a first pair of holes including a first hole of the first plurality of holes and a second hole of the second plurality of holes which are overlapping when the riser height H is a first riser height H1;
- the first and second plurality of holes arranged so that as the riser height H increases by a first increment X from H1 to a riser height H2, the first pair of holes are no longer overlapping and a second pair of holes including a third hole of the first plurality of holes and a fourth hole of the second plurality of holes do overlap;
- a fastener dimensioned and configured to pass through the overlapping pairs of holes and disposed within an overlapping pair of holes;
- a second tread support device, the second tread support device having a second tread support device pivot point;
- a second tread support device lower part, the second tread support device lower part having a second tread support device vertical fin;
- a second tread support device upper part, the second tread support device upper part and the second tread support device lower part pivoting relative to one another about the second tread support device pivot point;
- a second tread support device first riser height H measured at a second tread support device second edge distal from the second tread support device pivot point, the second tread support device riser height H having a plurality of values;
- a second tread support device first plurality of holes passing through the second tread support device fin of the second tread support device lower part;
- a second tread support device second plurality of holes passing through the second tread support device upper part;
- a third pair of holes including a fifth hole of the second tread support device first plurality of holes and a sixth hole of the second tread support device second plurality of holes which are overlapping when the second tread support device riser height H is the first riser height H1;
- the second tread support device first and second plurality of holes arranged so that as the second tread support device riser height H increases by the first increment X from H1 to the riser height H2, the third pair of holes are no longer overlapping and a fourth pair of holes including a seventh hole of the second tread support device first plurality of holes and an eighth hole of the second tread support device second plurality of holes do overlap;
- a second fastener dimensioned and configured to pass through the overlapping pairs of holes of the second tread support device and disposed within an overlapping pair of holes;
- the second tread support device further comprising:
- a height adjustment mechanism separate from the pluralities of holes, the height adjustment mechanism providing a second independent adjustment to the riser height H of the second tread support device, the height adjustment mechanism located on the second tread support device second edge;
- the second edge being shorter than the first edge.
Dependencies are inferred from the claim text.