| 摘要 |
A molding apparatus for forming a molded piece that includes a positive impression of an object, the molded piece comprising a monolithic block that is larger than the object. The apparatus comprises a container in which a negative impression of the object is formed by casting it in a fast-setting flowable compound, and a mold extension that snaps on to the container and provides an additional mold volume that is contiguous with the negative impression. The invention further comprises a mixing apparatus for mixing fast-setting compounds. In one embodiment, the mixing apparatus comprises a cylindrical jar with a screw-on lid. A rod passes through an aperture in the lid and moves axially with respect to the jar. The end of the rod external to the jar is configured as a handle, and the end of the rod internal to the jar is connected to a circular mesh. The circular mesh is oriented parallel to the bottom of the jar and has an outer diameter which is slightly less than the smallest inner diameter of the jar. Mixing is accomplished by repeatedly moving the mesh axially from the lid to the bottom of the jar and back again. The mesh cross-members have a cross-section which acts to break up clumps as they form, and the holes passing through the mesh have a constriction which advantageously adds turbulence to the mixture, enhancing the mixing efficiency of the mesh.
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