screw-elevator

from The Century Dictionary.

• noun A form of passenger-elevator in which the cage is lifted by a screw.
• noun A dentists' tool, consisting of a staff having a gimlet-screw on the end to screw into the root of a tooth in order to pull it out.
• noun In surgery, a conical screw of hard rubber used to force open the jaws of maniacs or persons suffering from lockjaw.