Patent US3653251A successfully refreshed from Google Patents.
US3653251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe bending
Assignee: BAC AND BRITISH AEROSPACE
•
Filing: 1970-02-17
•
Granted: 1972-04-04
•
Expires: 1990-02-17
Abstract
Abstract Producing replicas of a sample pipe using a numerically controlled pipe bending machine, by deriving a Programme for the machine from the sample pipe, modifying the Programme in accordance with measurement of a test bend of pipe material, and bending pipe material on the machine in accordance with the modified Programme.
Inventors
- 👤 Paul Valentine Coonan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:38
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/12; G; G05; G05B; G05B19/00; G05B19/02; G05B19/42; G05B19/4202; G05B19/4207; Y; Y10; Y10S; Y10S72/00; Y10S72/702
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A method of producing pipes, to conform with a given sample pipe, using a numerically controlled pipe bending machine, comprising the steps of: giving a test bend of specified nominal angle and radius to a specimen of the pipe material on the machine, measuring the radius of the actual test bend produced, deriving from the given sample pipe a fundamental programme for the machine in terms of a series of straight pipe portions of specified lengths angularly joined at specified angles, modifying the fundamental programme in accordance with the measured radius of the test bend, and thereafter bending pipe material on the machine using the modified programme.
Claim 2
Independent Claim
107 words
A method of producing pipes, to conform with a given sample pipe, using a numerically controlled pipe bending machine, comprising the steps of: giving a test bend of specified nominal angle and radius to a specimen of the pipe material on the machine, measuring the radius of the actual test bend produced, deriving from the given sample pipe a fundamental programme for the machine in terms of a series of straight pipe portions of specified lengths angularly joined at specified angles, modifying the fundamental programme in accordance with the measured radius of the test bend, and thereafter bending pipe material on the machine using the modified programme.
Claim 3
Dependent Claim
61 words
A method of producing pipes according to claim 1, wherein the fundamental programme is modified by reducing the specified lengths of straight pipe portions to the extent necessary to mate up with the start and finish of each of the bends which will replace the angular joins of the fundamental programme, having regard to the measured radius of the test bend.
Claim 4
Dependent Claim
25 words
A method of producing pipes according to claim 1, wherein the radius of the actual test bend is measured on the outside of the bend.
Claim 5
Dependent Claim
58 words
A method of producing pipes according to claim 3, wherein the radius is measured by means of an instrument having two fixed feet and a movable foot midway between them, spring-loaded to the position in which the three feet are aligned, a geared-up dial gauge being provided to measure departure of the movable foot from the aligned position.
Claim 6
Dependent Claim
38 words
A method of producing pipes according to claim 1, wherein the fundamental programme is further modified to compensate for ''''spring-back,'''' on the basis of measurements of the actual angles produced in two test bends of different nominal angles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |