US3848339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylometer
Assignee: Individual
•
Filing: 1973-02-09
•
Granted: 1974-11-19
•
Expires: 1993-02-09
Abstract
Abstract A hand-held device for measuring the curvature of cylindrical or toroidal surfaces such as optical lenses. A longitudinally movable plunger or spindle extends from a rotationally adjustable indicator dial with its work-contact end bisecting a transverse support frame which carries a parallel pair of work-contact buttons spaced apart by the length of a chord of the curved work surface whose midspan is to be contacted by the plunger. The consequent dial read-out is a factor (in mm.) from which the curvature of the arc can be obtained, as by reference to tabulated data. The support frame is detachable from the indicator unit and a progressive series of such frames having buttons spaced apart by different chord lengths are provided for measuring both convex and concave workpieces of different curvatures. The pair of work-contact buttons are flat-ended cylinders which make point contact of an edge of the cylinder with an arcuate workpiece; when worn, such contact points can be shifted by rotating the button in the frame and thus maintain extreme precision of the instrument.
Inventors
- 👤 R Strasbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:45
CPC Classifications
G; G01; G01B; G01B3/00; G01B3/22; G01B3/24; G01B5/00; G01B5/20; G01B5/213
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A cylometer comprising in combination: a support carrying a projecting pair of contact members laterally spaced apart by the length of a chord which they are adapted to span upon contacting the curved surface of a workpiece, said contact members being mutually parallel, selectively rotatable cylinders, each characterized by an annular work-contact perimeter disposed perpendicular to its cylindrical axis and adapted for changeable point contact with the curved work surface, a longitudinally reciprocable plunger disposed parallel with said cylinders, transecting said support intermediate the contact members and having an end adapted to contact the workpiece in line with the midpoint of said chord, and indicator means responsive to movement of said plunge for indicating the perpendicular distance between said chord and the work-contacting end of the plunger, whereby the curvature of said workpiece can be determined.
Claim 2
Dependent Claim
136 words
A cylometer comprising in combination: a support carrying a projecting pair of contact members laterally spaced apart by the length of a chord which they are adapted to span upon contacting the curved surface of a workpiece, said contact members being mutually parallel, selectively rotatable cylinders, each characterized by an annular work-contact perimeter disposed perpendicular to its cylindrical axis and adapted for changeable point contact with the curved work surface, a longitudinally reciprocable plunger disposed parallel with said cylinders, transecting said support intermediate the contact members and having an end adapted to contact the workpiece in line with the midpoint of said chord, and indicator means responsive to movement of said plunge for indicating the perpendicular distance between said chord and the work-contacting end of the plunger, whereby the curvature of said workpiece can be determined.
Claim 3
Dependent Claim
34 words
A cylometer according to claim 1 wherein said support is detachably secured to the plunger and indicator means, whereby supports having contact members with spans of different chord lengths are interchangeable in the cylometer.
Claim 4
Dependent Claim
28 words
A cylometer according to claim 1 wherein said indicator means are adjustably mounted on said plunger, whereby they may be preset to the plane of a particular chord.
Claim 5
Dependent Claim
20 words
A cylometer according to claim 1 wherein said contact members are individually rotatable cylinders having annularly enlarged, flat work-contact ends.
Claim 6
Dependent Claim
21 words
A cylometer according to claim 2 in combination with a plurality of said detachable supports having spans of different chord length.
Claim 7
Dependent Claim
117 words
An attachment for detachable connection to a cylometer assembly having a longitudinally reciprocable plunger and graduated indicator means activatable by movement of said plunger, said attachment comprising a transverse arm medially apertured for free passage therethrough of the contact end of such plunger, coupling means surrounding said aperture for engagement with the cylometer assembly, and a pair of mutually parallel, selectively rotatable, cylindrical work-contact members spaced apart along said arm equidistant on opposite sides of said aperture so as by point contact with the annular perimeter thereof to span a chord of a curved workpiece of which the arcuate center may be contacted by said plunger upon passing through said aperture, parallel to said cylindrical work-contact members.
Claim 8
Dependent Claim
117 words
An attachment for detachable connection to a cylometer assembly having a longitudinally reciprocable plunger and graduated indicator means activatable by movement of said plunger, said attachment comprising a transverse arm medially apertured for free passage therethrough of the contact end of such plunger, coupling means surrounding said aperture for engagement with the cylometer assembly, and a pair of mutually parallel, selectively rotatable, cylindrical work-contact members spaced apart along said arm equidistant on opposite sides of said aperture so as by point contact with the annular perimeter thereof to span a chord of a curved workpiece of which the arcuate center may be contacted by said plunger upon passing through said aperture, parallel to said cylindrical work-contact members.
Claim 9
Dependent Claim
41 words
An attachment according to claim 6 wherein said work-contact members are cylinders having flat, annularly enlarged, work-contact faces, and means for anchoring same in said arm at selected rotational positions whereby edge contact points of their contact faces may be changed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |