Acoustic micrometer
OwnerHenri Perreaultinventor
Life of this patent
Estimating the term…
Abstract
An acoustic micrometer for measuring the exact distance between two electrically interconnected metallic objects is disclosed. The micrometer comprises a micrometer head having an electrical contact at one end adapted to engage one of the metallic objects when taking a measurement, a housing secured to the other end of the micrometer head and adapted to physically engage the other metallic object, a battery located in the housing, electrical contact means connected to one terminal of the battery and mounted at the end of the housing so as to engage the other metallic object when taking a measurement, and a sound generator and speaker assembly adapted for connection of the micrometer head to emit an audible signal when the electrical circuit is completed between the metallic objects.
Claims4
A hand-held acoustic micrometer of the inside type for measuring the exact distance between two electrically-interconnected metallic objects, at least one of which is a flat surface, comprising:
- (a) a micrometer head comprising a barrel having a closed outer end and a spindle telescopically and rotatably inserted through the other end of said barrel and protruding from said other end of said barrel, a stud protruding from said closed outer end of said barrel and forming an electrical contact adapted to engage the other one of said metallic objects when taking a measurement;
- a straight rod secured at one end to the protruding portion of said spindle and axially aligned with said stud;
- (b) a housing secured to the other end of said rod at its inner end and having a cavity opening at the outer end of said housing, a base plate secured to the outer end of said housing and closing said cavity of said housing, said base plate forming an outer flat surface perpendicular to the common axis of said stud end of said rod and adapted to physically engage said flat surface of said one metallic object, so as to maintain said axis perpendicular to said last-named flat surface, said base plate made of electric insulating material and having a cavity opening at its outer flat surface;
- (c) a battery located in said housing cavity;
- (d) a resilient electrical contact blade connected to one terminal of said battery and mounted within said cavity of said base plate and biased to take a free standing position in which it protrudes from said outer flat surface of said base plate, so as to bend inwardly and make good electrical contact with said one metallic object when said base plate physically engages said flat surface of said one metallic object;
- and
- (e) a sound generator and speaker assembly removably connected between the other terminal of said battery and said stud and emitting a sound when the electrical circuit is completed between the metallic objects through said stud and through said contact blade.
Dependencies are inferred from the claim text.