Indicating instrument with migration barriers
OwnerVincent H. Roseinventor
Life of this patent
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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. Certain fluids have a tendency to migrate, or “creep,” over surfaces they contact. The fluid migration barriers of the present invention prevent unwanted migration of fluid out of a cavity by providing a sharp peak over which the fluid cannot creep.
Claims21
A fluid migration barrier system for preventing the migration of a fluid out of a chamber, comprising:
- a housing defining a chamber, wherein the chamber has at least a first opening defined by a first perimeter edge of the housing and a closed end substantially opposite the first opening, and wherein an axis is defined between the center of the first opening and the center of the closed end;
- a fluid disposed in the chamber;
- a first ridge on the housing surrounding the axis of the chamber;
- wherein the first ridge forms a first sharp edge, thereby discouraging the fluid in the chamber from migrating over the surface of the housing beyond the first ridge.
An indicating instrument, comprising:
- a housing defining a chamber having at least a first opening;
- a fluid disposed in the chamber;
- a rotatable element having an axis of rotation and rotatably mounted in the chamber;
- a shaft, concentric with and attached to the rotatable element and extending through at least the first opening;
- and
- a first fluid migration barrier on the housing surrounding the axis of rotation of the rotatable element and discouraging the migration of the fluid over the surface of the housing beyond the first fluid migration barrier.
An indicating instrument, comprising:
- a housing defining a chamber having at least a first opening;
- a fluid disposed in the chamber;
- a rotatable element having an axis of rotation and rotatably mounted in the chamber;
- a shaft, concentric with and attached to the rotatable element, extending through at least the first opening;
- and
- a first fluid migration barrier on the rotatable element surrounding the axis of rotation of the rotatable element and discouraging the migration of the fluid over the surface of the rotatable element beyond the first fluid migration barrier.
Dependencies are inferred from the claim text.