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US 12,644,287 B2Granted
Stair nosing
AssigneeMacneil IP LLC
InventorDavid S. Iverson
Life of this patent
Estimating the term…
Abstract
An injection molded stair nosing has a tread member, a front portion of which is downwardly and backwardly canted from the horizontal by about 5 to about 7 degrees. The front portion is supported by a plurality of spaced apart support ribs underneath the front portion. Each support rib may have a front concave surface to fit to a curved transition of a stair tread to a stair riser or nose. A back portion of the tread member is tapered to mitigate any interference with the foot or shoe of a user.
Claims9
A stair nosing integrally molded of an elastomer and comprising:
- a tread member having a back end and a front end, an upper surface of the tread member spaced from a general lower surface thereof;
- a riser member having a top end joined to the front end of the tread member by a convexly curved transition and a bottom end downwardly displaced from the top end;
- the tread member including a front portion adjacent to the front end, an angle of the upper surface when taken within the front portion being in the range of about 5 degrees to about 7 degrees;
- the general lower surface of the tread member being downwardly displaced from the upper surface of the tread member by a substantially constant thickness when measured within the front portion of the tread member;
- and
- a plurality of support ribs each downwardly extending from the general lower surface of the tread member within the front portion thereof, each support rib having a lower edge, most of each of the lower edges of the support ribs conforming to a common horizontal plane and operable to support the front portion of the tread member on a horizontal stair tread, wherein the support ribs are spaced apart from each other and are parallel to each other, and wherein each support rib rearwardly extends from the front end of the tread member.
3 more elements
A stair nosing comprising:
- a tread member having a front end, a back end, an upper surface and a general lower surface;
- a riser member having a top end joined to the front end of the tread member by an upwardly convex curved transition and a bottom end downwardly displaced from the top end, the riser member having a front surface and a general rear surface;
- the tread member having a front portion rearwardly extending from the front end of the tread member, a plurality of support ribs downwardly extending from the general lower surface of the tread member at least within the front portion of the tread member, each support rib having a front end joined to the general rear surface of the riser member;
- each support rib having lower margin, most of the lower margin conforming to a common horizontal plane, a concave portion of the lower margin disposed adjacent to and transitioning to the general rear surface of the riser member, whereby the concave portion of the lower margin of each support rib may conform to a convexly curved transition located at a front end of a tread on which the stair nosing is installed.
1 more element
Dependencies are inferred from the claim text.