G - Physics – 01 – J
Patent
G - Physics
01
J
292/4, 73/52
G01J 5/02 (2006.01) G05G 5/12 (2006.01)
Patent
CA 2027180
ABSTRACT OF THE DISCLOSURE It is known to retain a pyrometer in a sighting tube by means of anut that is locked in place by a length of wire. In the present invention the nut encloses a ratchet mechanism formed by two coaxial collars with inclined ratchet teeth at their ends. The teeth are urged together by a helical spring, one of the collars being prevented from rotation relative to the nut by means of a pin that engages a slot in the collar. The other collar has an annular face which is urged by a disc spring against a washer locked with the body of the pyrometer so as to form a friction clutch. The ratchet allows the nut to be tightened but it can only be untightened by overcoming the friction of the clutch.
Dawson Peter G.
Fetherstonhaugh & Co.
Smiths Industries Public Limited Company
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