Stock material or miscellaneous articles – Longitudinally sectional layer of three or more sections – Next to unitary sheet of equal or greater extent
Reexamination Certificate
2002-01-29
2003-07-22
Thomas, Alexander S. (Department: 1772)
Stock material or miscellaneous articles
Longitudinally sectional layer of three or more sections
Next to unitary sheet of equal or greater extent
C428S054000, C428S058000, C428S060000, C052S179000
Reexamination Certificate
active
06596362
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a wooden stairtread, more particularly to a wooden stairtread having all surfaces thereof covered by higher quality wood.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional wooden stairtread, as disclosed in U.S. Pat. No. 5,985,398, is shown to have a rectangular shape, a length, height and depth, and includes a nose member
1
and an elongate tread body
2
interconnected to each other. The nose member
1
is made of a single, unbroken, solid piece of higher quality wood, and extends the full height and full length of the stairtread. The nose member
1
has a first longitudinal edge surface
101
and a second longitudinal edge surface
102
opposite to the first longitudinal edge surface
101
. The second longitudinal edge surface
102
is rounded in cross section to form the nose of the stairtread. The elongate tread body
2
includes a core layer
201
having a top face, a top layer
202
having a bottom face glued to the top face of the core layer
201
, and a longitudinal edge surface
203
glued to the first longitudinal edge surface
101
of the nose member
1
. The core layer
201
is made of a plurality of first elongate thicker lamellas
201
′ which are glued laterally and adjacently to each other. The first elongate thicker lamellas
201
′ are made of lower quality wood, and include one thicker lamella
201
″ that is most distal from the nose member
1
. The thicker lamella
201
″ is made of a single, unbroken piece of lower quality wood material, and extends the full length of the stairtread. The top layer
202
is made of a plurality of single, unbroken, second elongate thinner lamellas
202
′ which are glued laterally and adjacently to each other. The second elongate thinner lamellas
202
′ are made of higher quality wood. The top layer
202
and the nose member
1
define continuous higher quality wooden apparent top and nose surfaces of the stairtread.
Although the conventional wooden stairtread uses a combination of the higher and lower quality wood materials to help reduce consumption and destruction of forest resources, the stairtread does not convey a wholly covered higher quality wood appearance.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a wooden stairtread having all surfaces thereof covered by higher quality wood.
According to this invention, a wooden stairtread having a length, height and depth, comprises an elongate nose member, an elongate tread body, and a tread end member. The elongate nose member extends the full length and full height of the stairtread, is made of higher quality wood, and has a longitudinal front curved surface, a longitudinal connecting end surface opposite to the longitudinal front curved surface, and two opposite lateral end surfaces. The longitudinal connecting end surface has upper and lower longitudinal edges. The elongate tread body extends the full length and full height of the stairtread, and has first and second longitudinal connecting end surfaces. The first longitudinal connecting end surface is connected to the longitudinal connecting end surface of the nose member. The second longitudinal connecting end surface is opposite to the first longitudinal connecting end surface. The tread body includes at least one elongate core layer, at least one upper surface layer, and at least one lower surface layer. The elongate core layer is between the first and second longitudinal connecting end surfaces, and has top and bottom sides. The upper surface layer is secured to the top side of the core layer, and has a top side flush with the upper longitudinal edge of the longitudinal connecting end surface of the nose member. The lower surface layer is secured to the bottom side of the core layer, and has a bottom side flush with the lower longitudinal edge of the longitudinal connecting end surface of the nose member. The core layer includes two lateral end members and at least one middle core member between the lateral end members. Each of the lateral end members has an end face that is flush with a respective one of the lateral end surfaces of the nose member. The lateral end members and the upper and lower surface layers are made of higher quality wood. The middle core member is made of lower quality wood. The tread end member is opposite to the nose member, is made of higher quality wood, and is connected to the second longitudinal connecting end surface of the tread body.
REFERENCES:
patent: 5985398 (1999-11-01), Bellegarde
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