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US 2003/0206274 A1Published application
Ophthalmic refractor having gear phasing hub
AssigneeReichert, Inc.
InventorChristopher Goris
Life of this patent
Estimating the term…
Abstract
A subjective ophthalmic refractor comprises a cylinder power adjustment knob for simultaneously actuating a cylinder power scale and an indexable lens carrier drive assembly. The drive assembly includes a gear phasing hub designed to allow a scale marking to be centered in a display window of the refractor and components of the drive assembly to be set in proper rotational orientation as independent operations.
Claims10
An ophthalmic refractor comprising:
- a viewing path;
- a housing having a display window;
- a lens carrier holding a plurality of lenses, said lens carrier being rotatably mounted in said housing to permit a chosen one of said plurality of lenses to be positioned in said viewing path;
- a rotatable adjustment knob;
- first and second gears fixed to said adjustment knob for rotation therewith;
- a ring-shaped scale including an internal gear meshing with said first gear, said scale having angularly spaced markings viewable through said display window;
- a third gear meshing with said second gear;
- a driver plate coaxial with said third gear and operatively connected to said lens carrier for rotating said lens carrier;
- and
- means for selectively securing said driver plate to said third gear at any chosen angular orientation relative to said third gear.
7 more elements
An ophthalmic refractor comprising:
- a viewing path;
- a housing having a display window;
- at least one lens carrier holding a plurality of lenses, said at least one lens carrier being mounted in said housing for rotation about a carrier axis to permit a chosen one of said plurality of lenses to be positioned in said viewing path;
- a rotatable adjustment knob;
- a drive assembly operably connected to said adjustment knob for rotating said at least one lens carrier in response to rotation of said adjustment knob;
- a rotatable scale operably connected to said adjustment knob, said scale having angularly spaced markings viewable through said display window and said scale rotating in response to rotation of said adjustment knob;
- and
- means for temporarily disconnecting said drive assembly from said adjustment knob to allow independent rotation of said scale in response to rotation of said adjustment knob without an accompanying actuation of said drive assembly.
5 more elements
Dependencies are inferred from the claim text.