Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se
Reexamination Certificate
1997-09-12
2001-07-03
Vargdt, Mathieu D. (Department: 1732)
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
C425S174400, C425S179000, C425S470000, C425S472000, C425SDIG002, C249S117000, C249S160000, C249S163000, C156S272200
Reexamination Certificate
active
06254370
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a form for manufacturing a resin mold for molding an ultraviolet-curable resin which is poured therein by exposure to ultraviolet radiation, and a clamping jig for clamping such a resin mold.
2. Description of the Related Art
Generally, product development projects include a stage for manufacturing replicas of a new product for the purpose of making various appraisals of its qualities such as appearances, etc. One well known process of producing replicas is a vacuum casting method which employs a matrix of silicone rubber. According to this method, a master model as a pattern for producing replicas is formed, and then embedded in a thermosetting liquid silicone rubber compound. Then, after the thermosetting liquid silicone rubber compound is vulcanized, the master model is removed, and a thermosetting resin is poured into the mold cavity that has been created in the thermosetting liquid silicone rubber compound. The poured thermosetting resin is cured with heat, producing a replica.
To meet demands for forming replicas quickly, there has been proposed a process of producing replicas as disclosed in Japanese laid-open patent publication No. 3-11471, for example. The disclosed process employs a mold made of a transparent RTV (room-temperature-vulcanizable) silicone rubber compound. An ultraviolet-curable liquid resin such as an epoxy resin or an acrylic reactive resin is poured into the mold, and then cured into a replica by exposure to ultraviolet radiation.
The conventional process disclosed in the above publication is disadvantageous in that it is considerably time-consuming to produce the molded replica, and hence fails to satisfy user's demands for a quick overall period required from the designing of a master model until appraisals of the replica.
The applicant has proposed a process of simply and quickly producing a replica by generating a master model, forming a matrix of silicone rubber based on the master model, and pouring a resin into the matrix, as disclosed in Japanese patent application No. 8-274068.
According to the above proposed process, a matrix having a cavity complementary in shape to a replica to be formed is constructed of a vulcanized body of transparent photo-setting liquid silicon rubber compound, and a photo-setting liquid resin is poured into the cavity in the matrix. Light emitted from a light source outside of the matrix is applied to the photo-setting liquid resin through the matrix for thereby curing the photo-setting liquid resin into a replica.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a form for manufacturing a resin mold easily and quickly.
A major object of the present invention is to provide a clamping jig for reliably clamping a resin mold to produce a high-quality molded product.
REFERENCES:
patent: 4824628 (1989-04-01), Curfman
patent: 5011633 (1991-04-01), Neefe
patent: 5039469 (1991-08-01), Martell et al.
patent: 5885514 (1999-03-01), Tensor
patent: 446040A1 (1991-09-01), None
patent: 0 832 726 A2 (1998-04-01), None
patent: 58-122813 (1983-07-01), None
patent: 3-11471 (1991-01-01), None
patent: 3-114711 (1991-05-01), None
patent: 4-018313 (1992-01-01), None
Kita Tarou
Matsuoka Yasuhiko
Guss Paul A.
McDowell Suzanne E.
Shonan Design Co., Ltd.
Vargdt Mathieu D.
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