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US4426140A Expired / Lapsed US ⏱️ 0.0 years remaining

Refractor suspension system

Assignee: CAMBRIDGE INSTRUMENTS Inc A DEL CORP
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Filing: 1980-08-11
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Granted: 1984-01-17
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Expires: 2000-08-11
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Abstract

Abstract A compact refraction instrument for use in both the objective and subjective examination of human eyes. The instrument incorporates an alignment mode, a retinoscopy mode, a distance mode and near mode. For carrying out the functions associated with these modes, the instrument includes a Brewster stereoscope, a mode change system, and a system for supporting a plurality of binocular/monocular vision testing slides. The instrument also includes a refractor system and apparatus for suspending the refractor system in the optical paths before the Brewster stereoscope. The refractor suspension system includes a frame support, a refractor support plate, an apparatus secured between the frame and refractor support plate for pivoting the refractor support plate about an axis substantial coincident with an axis in the plane of and centered between the two optical axes of the refractor. The apparatus for pivoting includes: first and second slides pivotly connected to the frame and slidably coupled to the refractor support plate; a third slide; apparatus for producing relative motion between the third slide and the refractor support plate; and a link for coupling the third slide with one of the first and second slides. The refractor support plate also includes apparatus for adjusting the interpupilary distance between the optical axes of the refractor.

Inventors

  • 👤 Donn E. Stephens

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 19:59
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/0083; A61B3/02; A61B3/028

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 71 words
Apparatus for supporting and positioning the halves of refractor, each half having an optical axis, said apparatus comprising: (a) support means; (b) refractor support plate; and (c) means, secured between said support means and said refractor support plate, for pivoting said refractor support plate about an axis substantially coincident with an axis in the plane of and centered between said optical axes said means for pivoting being offset from said plane.
Claim 2
Dependent Claim 71 words
Apparatus for supporting and positioning the halves of refractor, each half having an optical axis, said apparatus comprising: (a) support means; (b) refractor support plate; and (c) means, secured between said support means and said refractor support plate, for pivoting said refractor support plate about an axis substantially coincident with an axis in the plane of and centered between said optical axes said means for pivoting being offset from said plane.
Claim 3
Dependent Claim 64 words
The apparatus as set forth in claim 1, wherein: said means for pivoting includes first and second slides, said slides being pivotally connected to said support means, said first slide being connected to said refractor support plate for translation along a first axis, said second slide being connected to said refractor support plate for translation along a second axis which intersects said first axis.
Claim 4
Dependent Claim 50 words
The apparatus as set forth in claim 2, wherein: for at least one position of said first slide and one position of said second slide, said first and second axes are tangent to an imaginary circle centered at said axis in the plane of and centered between said optical axes.
Claim 5
Dependent Claim 101 words
The apparatus as set forth in claim 2 or 3, wherein: said means for pivoting includes a third slide connected to said refractor support plate, means for producing relative motion between said third slide and said refractor support plate along a third axis and means for coupling said third slide to said first slide, whereby relative motion between said third slide and said refractor support plate pivots said first slide about its connection with said support means and produces relative motion between said refractor support plate and said first slide to thereby pivot said refractor support plate about said pivot axis.
Claim 6
Dependent Claim 24 words
The apparatus as set forth in claim 4, wherein: said refractor support plate includes means for adjusting the interpupilary distance between said refractor halves.

References Cited (Backward Citations)

US1804690A Cited
US2095235A Cited
US2266797A Cited
US2596264A Cited
US2949810A Cited
US4243304A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-01-16 1987-07-18 1988-01-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-01-16 1991-07-18 1992-01-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-01-16 1995-07-18 1996-01-17 $7700.00 Window Closed / Lapsed

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