JP2010035969A5 - - Google Patents

Claims (7)

In a cushion for a chair comprising a seat with a seat surface that supports the thighs of the left and right legs when sitting,
The seat portion includes a base plate, a cushion portion provided on the upper surface side of the base plate, and a surface material provided on the upper surface of the cushion portion to form the seat surface,
A sciatic hole penetrating from the upper surface to the lower surface of the base plate is provided in a portion corresponding to the sciatic portion of the base plate, and the upper surface of the base plate is formed on the upper surface of the base plate corresponding to the thighs of the left and right legs. Forming a pair of recesses recessed from the general surface of
The recess of the base plate is formed so as to incline downward from the portion corresponding to the base of the thigh toward the front end side of the base plate,
Protrusions facing the thighs of the left and right legs when seated are detachably provided between the pair of recesses on the front end side of the seat,
A chair cushion, comprising: a sciatic cushion fitted into the sciatic hole; and a net-like support sheet provided on the base plate and supporting the sciatic cushion. A base body having upper and lower surfaces that are removably attached to the base plate, a cushion body provided on the upper surface of the base body, a projection surface provided on the upper surface of the cushion body, and the base The cushion for a chair according to claim 1, further comprising an attachment / detachment mechanism that allows the body to be attached to and detached from the base plate. The attachment / detachment mechanism includes a nut provided on the base body, a bolt insertion hole formed at a position corresponding to the nut and penetrating the base plate, and a bolt inserted into the bolt insertion hole and screwed into the nut. The chair cushion according to claim 2, comprising: The cushion for a chair according to any one of claims 1 to 3, wherein the cushion portion is provided with a raised portion for raising the rear end edge portion and both side edge portions of the seat portion. The chair cushion according to claim 4, wherein a maximum thickness H inside the raised portion is 20 mm ≦ H ≦ 45 mm. The chair cushion according to any one of claims 1 to 5, wherein the cushion portion is evacuated to cover the outer surface. A frame-shaped reinforcing bracket is provided on the lower surface of the rear end side of the base plate, and a hanging body that can be locked to a seat portion of an existing chair that hangs downward from the reinforcing bracket is provided on the rear end side of the reinforcing bracket. The chair cushion according to any one of claims 1 to 6, wherein the chair cushion is provided.