Wooden Structure for Stair

Abstract

A wooden structure for a stair having tread and riser surfaces includes a tread member including a tread core layer made of lower quality wood and having a tread bottom face, and a tread lamella layer fixed on top of the tread core layer, made of higher quality wood, and having a tread top face. The tread member has a first height, and tread front and rear end faces respectively interconnecting front and rear ends of the tread top and bottom faces. A front nose member has a front nose rear face connected to the tread front end face and having a part extending downwardly from the tread front end face and adapted to face the riser surface, a front decorative face, and front nose top and bottom ends spaced apart from each other by a second height that is larger than the first height.

1 . A wooden structure for a stair which has a tread surface and a riser surface, said wooden structure comprising:
 a tread member including a tread core layer made of lower quality wood and having a tread bottom face, and a tread lamella layer fixed on top of said tread core layer, made of higher quality wood, and having a tread top face opposite to said tread bottom face, said tread member having a first height, a tread front end face interconnecting front ends of said tread top and bottom faces, and a tread rear end face interconnecting rear ends of said tread top and bottom faces; and   a front nose member made of wood and having a front nose rear face connected to said tread front end face and having a part extending downwardly from said tread front end face and adapted to face the riser surface, a front decorative face opposite to said front nose rear face, a front nose top end interconnecting top ends of said front nose rear face and said front decorative face, and a front nose bottom end interconnecting bottom ends of said front nose rear face and said front decorative face, said front nose top and bottom ends being spaced apart from each other by a second height that is larger than said first height.   
     
     
         2 . The wooden structure of  claim 1 , wherein said lower quality wood is selected from the group consisting of rubber wood, pine wood, cedar wood, defective higher quality wood, high density fiber material, wood core board, plywood board, and particle board. 
     
     
         3 . The wooden structure of  claim 1 , wherein said tread core layer of said tread member is made of a single wood piece. 
     
     
         4 . The wooden structure of  claim 1 , wherein said higher quality wood is selected from the group consisting of oak wood, maple wood, poplar wood, cherry wood, beech wood, alder wood, and hemlock wood. 
     
     
         5 . The wooden structure of  claim 1 , wherein said front nose rear face is connected to said tread front end face through a mortise-and-tenon joint, said tread front end face having a tenon of said mortise-and-tenon joint that projects forwardly from said tread front end face and that extends along the length of said tread member, said front nose rear face having a mortise of said mortise-and-tenon joint that extends inwardly from said front nose rear face and that extends along the length of said front nose member to receive said tenon. 
     
     
         6 . The wooden structure of  claim 5 , wherein said front decorative face has a non-planar surface, said front nose member having a non-uniform thickness in a front-to-rear direction and which varies from said front nose top end to said front nose bottom end. 
     
     
         7 . The wooden structure of  claim 6 , wherein said front nose member is made of higher quality wood selected from the group consisting of oak wood, maple wood, poplar wood, cherry wood, beech wood, alder wood, and hemlock wood. 
     
     
         8 . The wooden structure of  claim 1 , wherein said tread member further has at least one tread lateral end face extending from said tread front end face to said tread rear end face, said wooden structure further comprising at least one side nose member connected to said tread lateral end face through a mortise-and-tenon joint. 
     
     
         9 . The wooden structure of  claim 8 , wherein said front nose member further has two opposite front nose left and right lateral ends, said side nose member further having a side nose front end face fixed to one of said front nose left and right lateral ends, a side nose rear end face extending rearwardly beyond said tread rear end face by a distance, and side nose top and bottom end faces spaced apart from each other by a height similar to said second height. 
     
     
         10 . The wooden structure of  claim 8 , wherein said side nose member is made of higher quality wood selected from the group consisting of oak wood, maple wood, poplar wood, cherry wood, beech wood, alder wood, and hemlock wood. 
     
     
         11 . The wooden structure of  claim 1 , further comprising a riser member having a top portion clamped by said part of said front nose rear face against the riser surface. 
     
     
         12 . The wooden structure of  claim 11 , wherein said riser member includes a riser core layer made of lower quality wood and adapted to abut against the riser surface, and a riser lamella layer fixed to an outer surface of said riser core layer and made of higher quality wood.