Patent ID: 9644371
Date: 2017-05-09
CPC Classifications: A47B,B32B,E04C,Y10T

Claim:
1. A board panel comprising: a rectangular top of three or more stacked layers, wherein at least two layers are a hard material and at least one layer is a soft elastic pressure absorbing material; a front face layer and a back face layer are layers of a hard material in which slits are provided in parallel with a vertical side of said rectangular top; said slits have a length of ½ to ¾ of said vertical side, and one end thereof touches the horizontal side of said rectangular top; and said slits include one type in which one end thereof touches an upper horizontal side of said rectangular top, forming upper slits, and another type in which one end thereof touches a lower horizontal side of said rectangular top, forming lower slits, said slits have a depth that do not penetrate through the board panel, wherein said slits provided on the front face layer alternate between slits touching the upper horizontal side and slits touching the lower horizontal side of said rectangular top, said slits provided on the back face layer alternate between slits touching the upper horizontal side and slits touching the lower horizontal side of said rectangular top, and wherein said front face layer and said back face layer alternate between slits touching the upper horizontal side and the lower horizontal side.