Formation of foamed resin article
An embedment member of a foamed resin article such as a seat pad formed in a mold. The mold is provided with engaging projections and a pocket portion formed in or on an inner surface of a core thereof. A surface of the embedment member is positioned to face the core and the surface is superposed onto the surface of the core such that the projections enter into large opening portions. Then, the embedment member is slid in such a manner as to introduce the projections into narrow portions and wide portions, thereby retaining the embedment member to the core. In this state, an end portion of the embedment member is fitted into the pocket portion. To release the foamed resin article from the mold, the foamed resin article is slid in a direction opposite to the direction of the aforementioned sliding.
1. An embedment member that attaches to an inner surface of a mold for forming a seat pad by foaming and to be integrated with the resin foam when a resin material is foamed in the mold, wherein
said embedment member is provided with a concave portion that engages with an engaging projection formed on the inner surface of the mold to hold the embedment member to the inner surface of the mold, wherein the concave portion is provided at a first exterior face of the embedment member, said first exterior face being planar in the vicinity of the concave portion,
said engaging projection has a thin leg and an enlarged head, and
said concave portion has a narrow portion to be engaged with the leg, a wide portion to be engaged with the head, and a passage portion for the passage of the head,
wherein, the wide portion is positioned behind the narrow portion with respect to the planar first exterior face of the embedment member, such that the wide portion is provided at an interior of the embedment member, wherein both the narrow portion and the passage portion open directly from the planar first exterior face of the embedment member, wherein said narrow portion and said wide portion extend linearly from the passage portion toward a front side of the seat pad, wherein an outer periphery of each of the narrow portion and the passage portion is entirely enclosed by the planar first exterior face of the embedment member, and wherein the narrow portion is narrower than the passage portion.
2. An embedment member as claimed in claim 1 , wherein said concave portion has a large opening portion as said passage portion which is larger than said head, and said narrow portion and said wide portion extend from the large opening portion.
3. An embedment member as claimed in claim 2 , wherein the large opening portion has a taper portion in which the width is gradually reduced toward the narrow portion and the wide portion.
4. An embedment member as claimed in claim 3 , wherein said narrow portion and said wide portion linearly extend from the large opening portion.
5. An embedment member as claimed in claim 4 , wherein a plurality of said concave portions are provided and are positioned such that the directions in which the narrow portions and the wide portions extend from the large opening portions of the respective concave portions lie on a straight line and are the same as each other.
6. An embedment member as claimed in claim 4 , wherein a plurality of said concave portions are provided and are positioned such that the directions in which the narrow portions and the wide portions extend from the large opening portions of the respective concave portions are parallel to each other and the same as each other.