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US 4,391,127 AGranted
Proximity sensor
AssigneeE. I. Du Pont de Nemours and Company
InventorWilliam E. Hawkins
Life of this patent
Estimating the term…
Abstract
A sensor for detecting a break in a continuously advancing web. A vacuum tube extends through a plenum in a jet body. Air under pressure is introduced into the plenum and discharges through an annular orifice surrounding the tube onto a flared end. A low pressure switch in communication with the tube senses the absence of a web from its normal path of advance adjacent the flared end.
Claims3
A proximity sensor comprising:
- a body having a plenum therein in communication with inlet and outlet passages;
- an elongated tube extending through the plenum and projecting from the outlet passage, said tube having a lesser diameter than the outlet passage, presenting an annular discharge orifice, and a flared end located externally of said body and the discharge orifice;
- and
- a pressure switch having a sensing chamber in communication with the tube.
1 more element
Dependencies are inferred from the claim text.