US3656239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring apparatus
Assignee: English Electric Co Ltd
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Filing: 1969-04-07
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Granted: 1972-04-18
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Expires: 1989-04-07
Abstract
Abstract Apparatus for measuring the diameter of a workpiece includes a wheel which is rotated by contact with the workpiece and drives a pulse generator. The number of pulses generated during each revolution is counted and gives a direct indication of the workpiece diameter. The wheel is positioned by a unit which automatically sets the pressure of the wheel against the workpiece and retracts the wheel if any of a number of fault conditions occurs such as the feeding of the wheel against the side of a shoulder on the workpiece; reaching the limit of travel of the wheel without having reached the workpiece; over-pressure on the wheel caused, for example, by swarf between the wheel and the workpiece; and excessive forward movement of the wheel.
Inventors
- 👤 Desmond Ernest Hutchinson
- 👤 John David Bickerdike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
G; G01; G01B; G01B3/00; G01B3/12; G01B7/00; G01B7/001; G01B7/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
Apparatus for measuring at least one dimension of an object, said apparatus comprising a wheel mounted for rotation, a pulse generator mounted for being driven by said wheel, wheel moving means actuable to advance and retract said wheel relative to said object, resiliently biased means mounted for urging said wheel into contact with said object when said wheel is in an advanced position, and means responsive upon application thereto of an excessive reaction by virtue of a fault effecting movement of the wheel in the direction of retraction of said wheel moving means to initiate retraction of said wheel, by said wheel moving means.
Claim 2
Dependent Claim
104 words
Apparatus for measuring at least one dimension of an object, said apparatus comprising a wheel mounted for rotation, a pulse generator mounted for being driven by said wheel, wheel moving means actuable to advance and retract said wheel relative to said object, resiliently biased means mounted for urging said wheel into contact with said object when said wheel is in an advanced position, and means responsive upon application thereto of an excessive reaction by virtue of a fault effecting movement of the wheel in the direction of retraction of said wheel moving means to initiate retraction of said wheel, by said wheel moving means.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 1 wherein means are provided to initiate retraction of said wheel, if when said wheel is in an advanced position, said wheel moves in the direction of advancement of said wheel by more than a predetermined distance.
Claim 4
Dependent Claim
32 words
Apparatus as claimed in claim 1, wherein means are provided to initiate retraction of said wheel if the latter advances to a limit of its travel without said wheel engaging said object.
Claim 5
Dependent Claim
35 words
Apparatus as claimed in claim 1, wherein said wheel retracting means further includes a housing arranged for mounting at a predetermined distance from said object, said wheel moving means being slidable relative to said housing.
Claim 6
Dependent Claim
24 words
Apparatus as claimed in claim 14, wherein power-operated means are provided for effecting slidable movement of said wheel moving means relative to the housing.
Claim 7
Dependent Claim
52 words
Apparatus as claimed in claim 1, including an arm carrying said wheel; a notched member of said wheel moving means; pivot means for said arm urged into engagement with said notched member; and means to initiate retraction of said wheel in response to movement of the pivot means out of said engagement.
References Cited (Backward Citations)
US2554171A
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US2988218A
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US3077804A
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US3481042A
Cited
US3509635A
Cited
US3524130A
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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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |