| 摘要 |
A cup-shaped well formed of sheet metal has its side wall bulged outwardly into an exterior circumferential bead and its open end exteriorly screw-threaded and extending through a hole in the bottom wall of the percolator body. The circumferential bead is resilient and has spaced apart parallel portions perpendicular to the axis of the well and connected by an arcuate cross-section circumferential portion. One of the parallel portions of the bead abuts the bottom side of said wall, and a nut is screwed on said threaded end in abutment with the top side of said wall to fasten the well on said wall, and on the exterior of the bottom of said well is a resilient sheet metal nut to receive a screw for separably securing the base of the percolator on said body.
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