| 摘要 |
Apparatus for making a dome-shaped sealing element for a vaginal speculum fr om an annular workpiece (37) of closed cell polyethylene foam sheet material comprising a mould (28) defining an open ended cavity having a circular cros s- sectional shape smaller in diameter than the outside diameter of the workpiece, a loading station (32) wherein said workpiece may be applied to t he mould to rest on the mould to cover a mouth of said cavity, an insertion station (33) wherein a plunger with a convex head forces the workpiece into said cavity so as to cause the workpiece to adopt a domed shape with a conca ve side directed towards the mouth of the cavity, a heating station (34) wherei n radiant heating means heat the concave side of the workpiece in the mould cavity to soften a surface layer thereof, a cooling station (35) wherein the said surface layer is allowed to cool in the mould cavity, and an unloading station (36) wherein a plunger with a concave head pushes the shaped workpie ce from the cavity, conveyor means to shift the mould from station to station, and control means to effect coordinated operation of the conveyor means and the respective plungers and radiant heating means.
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