US3712741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the accurate measurement of dimensions of objects, especially the diameter of cylindrical objects
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1970-10-19
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Granted: 1973-01-23
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Expires: 1990-10-19
Abstract
Abstract The apparatus comprises two identical carriages mounted in opposite relation and driven in horizontal translational motion on a stationary frame, a stirrup mounted on each carriage for supporting an emitting and receiving optical system which defines a substantially vertical light ray having high definition, an optical gage and stops which are supported together with the cylindrical object to be measured on a fixed stage which is located substantially in the central horizontal plane of the stirrups, the stage being provided with a vertical slot for the passage of the light rays which are produced by the optical system. The optical system comprises a stable light source, a photosensitive receiver, a capillary tube on each stirrup arm for defining the path of the light ray with high precision. Means are also provided for controlling the rotation of the carriage-drive systems according to a preestablished program, for recording the relative displacements of the carriages and indicating numerically the relative translational displacements of the two light rays.
Inventors
- 👤 P Revert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:28
CPC Classifications
B; B07; B07C; B07C5/00; B07C5/04; B07C5/10; G; G01; G01B; G01B11/00; G01B11/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
314 words
An apparatus for the accurate measurement of the diameter of cylindrical objects, comprising a stationary horizontal frame, a roller-bearing table mounted on said stationary horizontal frame, two identical carriages on said table supported by highprecision roller-bearings, each of said carriages carrying a substantially stirrup-shaped member and being located in oppositely-facing relation, each of said carriages being displaceable in horizontal translational motion on said frame by a driving unit, means for recording and indicating the state of translational motion of one of said carriages relative to the other, a light emitting And receiving optical system mounted on each of said stirrups providing between the top and bottom arms of the stirrup a high definition substantially vertical light ray in fixed relation to said stirrup, a stationary supporting stage located substantially in a central horizontal plane of said stirrups, a vertical slot in said stage through which said light rays defined by said stirrups pass, the cylindrical object whose diameter is to be measured resting on said supporting stage, and means for detecting at the time of translational motion of each of said carriages the occultation of the light rays by the cylindrical object to be measured, said optical system producing a high-definition light ray including in the direction of travel of light a light source, a first capillary tube fixed on the first arm of said stirrup, a second capillary tube and a photosensitive receiver fixed on the second arm of said stirrup, said two capillary tubes having very substantially the same geometrical axis defining said light ray with very high precision, four parallel bars mounted on said supporting stage parallel to the axis of the objects to be measured, the two external ones of said bars being optical stops limiting the translation of each luminous ray and the two internal ones of said bars being secondary gauges of distance during a series of measurements.
Claim 2
Independent Claim
314 words
An apparatus for the accurate measurement of the diameter of cylindrical objects, comprising a stationary horizontal frame, a roller-bearing table mounted on said stationary horizontal frame, two identical carriages on said table supported by highprecision roller-bearings, each of said carriages carrying a substantially stirrup-shaped member and being located in oppositely-facing relation, each of said carriages being displaceable in horizontal translational motion on said frame by a driving unit, means for recording and indicating the state of translational motion of one of said carriages relative to the other, a light emitting And receiving optical system mounted on each of said stirrups providing between the top and bottom arms of the stirrup a high definition substantially vertical light ray in fixed relation to said stirrup, a stationary supporting stage located substantially in a central horizontal plane of said stirrups, a vertical slot in said stage through which said light rays defined by said stirrups pass, the cylindrical object whose diameter is to be measured resting on said supporting stage, and means for detecting at the time of translational motion of each of said carriages the occultation of the light rays by the cylindrical object to be measured, said optical system producing a high-definition light ray including in the direction of travel of light a light source, a first capillary tube fixed on the first arm of said stirrup, a second capillary tube and a photosensitive receiver fixed on the second arm of said stirrup, said two capillary tubes having very substantially the same geometrical axis defining said light ray with very high precision, four parallel bars mounted on said supporting stage parallel to the axis of the objects to be measured, the two external ones of said bars being optical stops limiting the translation of each luminous ray and the two internal ones of said bars being secondary gauges of distance during a series of measurements.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1, including means for carrying out automatic programming of the measuring cycles.
Claim 4
Dependent Claim
45 words
An apparatus according to claim 1, said driving unit for the translational motion of each of said carriages being a stepping motor mounted on said frame rotating a lead-screw through a reduction-gear unit, said lead-screw engaging in a floating nut rigidly fixed to said carriage.
Claim 5
Dependent Claim
54 words
An apparatus according to claim 1, said driving unit for the translational motion of each of said carriages being a motor of the continuous rotation type with rotary coder mounted on said frame to rotate a lead-screw through a reduction gear unit, said lead-screw engaging in a floating nut rigidly fixed to said carriage.
Claim 6
Dependent Claim
61 words
An apparatus according to claim 1, said means for indicating the state of translational motion of one carriage with respect to the other including a step counter accounting in the direction of subtraction the movements of translation bringing said two carriages towards each other and in the direction of addition the movements of translation of relative withdrawal of said two carriages.
Claim 7
Dependent Claim
64 words
An apparatus according to claim 4, said means for indicating the state of translational motion of one of said carriages with respect to the other including an angular displacement counter accounting in the direction of subtraction the movements of translation bringing said two carriages towards each other and in the direction of addition the movements of translation of relative withdrawal of said two carriages.
Claim 8
Dependent Claim
14 words
An apparatus according to claim 1, wherein the light source is an incandescent lamp.
Claim 9
Dependent Claim
15 words
An apparatus according to claim 1, wherein the light source is a gallium arsenide diode.
Claim 10
Dependent Claim
14 words
An apparatus according to claim 1, wherein the photosensitive receiver is a silicon photodiode.
Claim 11
Dependent Claim
45 words
An apparatus according to claim 1, each of said motors being controlled automatically by a sequence of pulses, stopping or changing of direction of the motors being initiated by the occultations of each light ray by the optical stop and the object to be measured.
Claim 12
Dependent Claim
19 words
An apparatus according to claim 10, the sequence of pulses establishing a unitary cycle for measuring a single object.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 10, the sequence of pulses establishing a repetitive cycle for rapid measurement of a large series of objects.
Claim 14
Dependent Claim
39 words
An apparatus according to claim 1, including means for automatic progression of objects to be measured in the measurement field along a slot, side walls for said slot in the shape of a V in said stationary supporting stage.
Claim 15
Dependent Claim
51 words
An apparatus according to claim 1, inclUding a predetermination device, means associated with said device for recording and indicating the state of translational motion of said carriages said device readjusting said means periodically to the dimension of said reference stops and manual means for introducing the dimension in said predetermination device.
Claim 16
Dependent Claim
93 words
Apparatus as described in claim 1, two of said bars being fixed to said supporting stage on one side of said object, the other two of said bars being on the opposite side of said object and being free and forming a leg of a hairpin shaped member having the same coefficient of expansion as that of the object to be measured, the other extremity of said hairpin shaped member being fixed to said supporting stage at the same point as said fixed bars whereby automatic compensation for variations of temperatures is obtained.
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |