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US 5,854,552 AGranted
Moving magnet indicating instruments with a plurality of damping fluid migration barriers
OwnerVincent H. Roseinventor
Life of this patent
Estimating the term…
Abstract
Moving magnet indicating instruments in which a damping fluid migration barrier projects from the inside of one wall of the bobbin coil and another damping fluid migration barrier projects from the face of the rotor which confronts that wall.
Claims14
A moving magnet indicating instrument, comprising:
- a coil bobbin defining a chamber, which chamber contains a quantity of damping fluid;
- a rotor shaft rotatably mounted in said bobbin and extending through said chamber and through at least one aperture in a wall of said chamber;
- a magnetic rotor fixedly mounted on said rotor shaft and located in said chamber;
- a first damping fluid migration barrier projecting into said chamber from said wall thereof and surrounding the axis of said rotor shaft;
- and
- a second damping fluid migration barrier projecting from a face of said rotor which confronts said wall of said chamber and surrounding the axis of said rotor shaft.
3 more elements
A moving magnet indicating instrument, comprising:
- a first coil bobbin defining a first chamber, which chamber contains a quantity of damping fluid;
- a second coil bobbin defining a second chamber, which chamber contains a quantity of damping fluid;
- a first rotor shaft rotatably mounted in said first and second bobbins and extending through said first and second chambers and through an aperture in a wall of said first chamber and an aperture in a wall of said second chamber;
- a second rotor shaft rotatably mounted in said first bobbin and extending through said first chamber and through said aperture in said wall of said first chamber;
- first and second magnetic rotors mounted respectively on said second rotor shaft and said first rotor shaft and located respectively in said first and second chambers;
- said second rotor shaft being hollow and containing a part of said first rotor shaft;
- said first and second rotor shafts each having an outer end projecting from the face of said first bobbin remote from said second bobbin;
- a first pointer mounted on said projecting end of said first rotor shaft;
- and
- a second pointer mounted on said projecting end of said second rotor shaft.
7 more elements
A moving magnet indicating instrument, comprising:
- a coil bobbin defining a chamber, which chamber contains a quantity of damping fluid;
- a rotor shaft rotatably mounted in said bobbin and extending through said chamber and through apertures in opposite walls of said chamber;
- a magnetic rotor fixedly mounted on said rotor shaft and located in said chamber;
- a first damping fluid migration barrier projecting into said chamber from one of said opposite walls thereof and surrounding the axis of said rotor shaft;
- a second damping fluid migration barrier projecting from the face of said rotor which confronts said one of said opposite walls and surrounding the axis of said rotor shaft;
- a third damping fluid migration barrier projecting into said chamber from the opposite one of said walls thereof and surrounding the axis of said rotor shaft;
- a fourth damping fluid migration barrier projecting from the face of said rotor which confronts said opposite one of said walls and surrounding the axis of said rotor shaft;
- and
- first and second pointers secured respectively to the opposite ends of said rotor shaft.
6 more elements
Dependencies are inferred from the claim text.