Static structures (e.g. – buildings) – Stepped; e.g. – stair
Reexamination Certificate
1999-01-14
2001-05-15
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Stepped; e.g., stair
C052S190000, C052S188000, C052S191000, C052S187000, C052S088000
Reexamination Certificate
active
06230454
ABSTRACT:
BACKGROUND OF INVENTION
This invention relates to a universal modular tread and riser unit for mounting on a stairway stringer for supporting a tread and a riser of a stairway, which unit includes structure for accommodating a stairway of any pre-selected rise and length. Once the rise and length of the stairway is selected, all of the units used with the stairway can be sized at one time for forming a stairway having the pre-selected rise and length.
Metal channels have been used for forming a stairway. See for example, U.S. Pat. No. 4,635,416 to Ayala. With this apparatus, each channel must be positioned individually to accommodate a stairway having a pre-selected rise and length.
U.S. Pat. No. 4,709,520 to Vochatzer shows stair brackets that must be individually positioned to accommodate a stairway of pre-selected rise and length. Guide tabs are provided to locate the bracket on a stringer having a pre-selected slope.
Other modular stair forming units are shown in U.S. Pat. No. 5,293,722 to Reimann and U.S. Pat. No. 5,806,254 to Bennett.
From the above it can be seen that what is needed is a universal modular tread and riser unit for mounting on a stairway stringer, which unit includes structure for accommodating a stairway of any pre-selected rise and length. Once the rise and length of the stairway is selected, it is desirable to have all all of the units used with the particular stairway sized easily at one time. It is further desirable to have the capability of mounting all of these units to a stairway stringer with the unit properly positioned on the stringer to have the treads horizontal and the risers vertical.
SUMMARY OF INVENTION
A universal modular tread and riser unit for positioning on a stairway stringer having a predetermined slope. The unit, including an elongate tread wall having two ends, including a connecting end and a free end. An elongate riser wall having two ends, including a connecting end and a free end. The riser wall having its connecting end joined to the connecting end of the tread wall with the riser wall oriented in a depending perpendicular relation to the tread wall. A pair of spaced apart vertical side walls is secured on either side of the connected tread wall and riser wall. The side walls are spaced apart sufficiently to receive a stairway stringer with the free end of the tread wall resting on the stringer and the free end of the riser wall resting on the stringer. The tread wall having a breakaway portion located at the free end of the tread wall for sizing the length of the tread wall between the ends of the tread wall, and the riser wall having a breakaway portion located at the free end of the riser wall for sizing the length of the riser wall between the ends of the riser wall.
REFERENCES:
patent: 5791101 (1999-05-01), Wallace
patent: 5806254 (1998-09-01), Bennet
patent: 5899032 (1998-08-01), Buzby
Chavez Patrick J.
Conover Richard C.
Friedman Carl D.
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