US3869776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating curved fittings and device for effecting same
Assignee: Individual
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Filing: 1973-08-16
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Granted: 1975-03-11
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Expires: 1993-08-16
Abstract
Abstract The present invention enables a manufacture of thickwalled fittings subjected to the effects of high temperatures, pressures and (or) aggressive media. Fittings manufactured according to the invention are designed for a high flow velocity. The formation of a curved fitting is effected by two pairs of dies, one thereof has flat working surfaces and the other, arcuate recesses. A tubular blank is successively reconstructed by said pairs of dies in the course of one or two strokes of a press.
Inventors
- 👤 Evgeny Nikolaevich Moshnin
- 👤 Nikolai Ivanovich Romashko
- 👤 Vyacheslav Pavlovich Nikolaev
- 👤 Viktor Alexeevich Odnodushny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:43
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/292; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49442; Y10T29/49444
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
174 words
A method of fabricating a curved fitting from a tubular blank having a round cross-section through the intermediary of a first pair of dies having substantially flat working surfaces and a second pair of dies having arcuate recesses extending in longitudinal and transverse sections thereof, comprising the steps of: a. imparting double-sided compression to said tubular blank by said first pair of dies so as to deform the round shape of the cross-section of said tubular blank into a shape having an oval cross-section; b. positioning said deformed tubular blank in close contact between the dies forming said second pair of dies, said dies being disposed on either side of the major axis of said oval cross-section of said blank until completion of the sequence of fabricating said curved fitting; and c. simultaneously bowing and compressing said deformed tubular blank by closing the dies forming said second pair, and moving said dies along the major axis of the oval cross-section of said deformed blank so as to shape said blank into said curved fitting.
Claim 2
Independent Claim
174 words
A method of fabricating a curved fitting from a tubular blank having a round cross-section through the intermediary of a first pair of dies having substantially flat working surfaces and a second pair of dies having arcuate recesses extending in longitudinal and transverse sections thereof, comprising the steps of: a. imparting double-sided compression to said tubular blank by said first pair of dies so as to deform the round shape of the cross-section of said tubular blank into a shape having an oval cross-section; b. positioning said deformed tubular blank in close contact between the dies forming said second pair of dies, said dies being disposed on either side of the major axis of said oval cross-section of said blank until completion of the sequence of fabricating said curved fitting; and c. simultaneously bowing and compressing said deformed tubular blank by closing the dies forming said second pair, and moving said dies along the major axis of the oval cross-section of said deformed blank so as to shape said blank into said curved fitting.
Claim 3
Independent Claim
174 words
A method of fabricating a curved fitting from a tubular blank having a round cross-section through the intermediary of a first pair of dies having substantially flat working surfaces and a second pair of dies having arcuate recesses extending in longitudinal and transverse sections thereof, comprising the steps of: a. imparting double-sided compression to said tubular blank by said first pair of dies so as to deform the round shape of the cross-section of said tubular blank into a shape having an oval cross-section; b. positioning said deformed tubular blank in close contact between the dies forming said second pair of dies, said dies being disposed on either side of the major axis of said oval cross-section of said blank until completion of the sequence of fabricating said curved fitting; and c. simultaneously bowing and compressing said deformed tubular blank by closing the dies forming said second pair, and moving said dies along the major axis of the oval cross-section of said deformed blank so as to shape said blank into said curved fitting.
Claim 4
Independent Claim
174 words
A method of fabricating a curved fitting from a tubular blank having a round cross-section through the intermediary of a first pair of dies having substantially flat working surfaces and a second pair of dies having arcuate recesses extending in longitudinal and transverse sections thereof, comprising the steps of: a. imparting double-sided compression to said tubular blank by said first pair of dies so as to deform the round shape of the cross-section of said tubular blank into a shape having an oval cross-section; b. positioning said deformed tubular blank in close contact between the dies forming said second pair of dies, said dies being disposed on either side of the major axis of said oval cross-section of said blank until completion of the sequence of fabricating said curved fitting; and c. simultaneously bowing and compressing said deformed tubular blank by closing the dies forming said second pair, and moving said dies along the major axis of the oval cross-section of said deformed blank so as to shape said blank into said curved fitting.
Claim 5
Independent Claim
196 words
A device for manufacturing a curved fitting from a tubular blank of a round cross-section, comprising a first pair of dies having substantially flat working surfaces movable in relative opposite directions, said dIes being retainable in a fixed position at a predetermined minimum distance therebetween until completion of the manufacturing sequence for said curved fitting; and a second pair of dies including a first die and a second die each having arcuated recesses extending in both longitudinal and transverse sections thereof, the radius of curvature of each recess of said dies in the transverse section being smaller than the radius of curvature of the outer surface of said tubular blank, the dies of said second pair being movable towards each other transversally relative to the direction of movement of the dies of said first pair, said relative movement of the dies of said first pair towards each other being adapted to reshape the round cross-section of said tubular blank into an oval cross-section, and said movement of the dies of said second pair towards each other imparting simultaneously bowing and compressing to said reconstructed tubular blank, so as to form said blank into said curved fitting.
Claim 6
Independent Claim
196 words
A device for manufacturing a curved fitting from a tubular blank of a round cross-section, comprising a first pair of dies having substantially flat working surfaces movable in relative opposite directions, said dIes being retainable in a fixed position at a predetermined minimum distance therebetween until completion of the manufacturing sequence for said curved fitting; and a second pair of dies including a first die and a second die each having arcuated recesses extending in both longitudinal and transverse sections thereof, the radius of curvature of each recess of said dies in the transverse section being smaller than the radius of curvature of the outer surface of said tubular blank, the dies of said second pair being movable towards each other transversally relative to the direction of movement of the dies of said first pair, said relative movement of the dies of said first pair towards each other being adapted to reshape the round cross-section of said tubular blank into an oval cross-section, and said movement of the dies of said second pair towards each other imparting simultaneously bowing and compressing to said reconstructed tubular blank, so as to form said blank into said curved fitting.
Claim 7
Dependent Claim
54 words
A device as claimed in claim 2, comprising said first die of said pair of dies with the arcuate recesses designed to be mounted by said dies with the predominantly flat working surfaces and a transfer of these dies across the direction of the movement of said pair of dies with the arcuate recesses.
Claim 8
Dependent Claim
113 words
A device as claimed in claim 3, comprising a movable cross-piece affixed whereto is the second die of said pair of dies with the arcuate recesses; two plates placed symmetrically with regard to said second die, also mounted upon said movable cross-piece and projecting with regard to said second die; inclined platforms upon free ends of said plates and inclined platforms upon peripheral sections of said dies with the predominantly flat working surfaces; said inclined platforms upon said plates and said dies being designed to interact with each other, thereby said dies with the predominantly flat working surfaces approach each other as said cross-piece moves to said first die with the arcuate recess.
Claim 9
Dependent Claim
39 words
A device as claimed in claim 4, comprising guides in said dies with the predominantly flat working surfaces, designed to interact with said plates mounted upon said cross-piece and for centering that cross-piece in the course of its movement.
Claim 10
Dependent Claim
41 words
A device as claimed in claim 5, comprising holes in said dies with the predominantly flat working surfaces, placed across said surfaces; rods passed through said holes and designed to prevent skewing of said dies in the course of their movement.
Claim 11
Dependent Claim
47 words
A device as claimed in claim 6, comprising in said first die with the arcuate recess projections with holes passed through which are said rods, thereby preventing a transfer of said dies with the predominantly flat working surfaces in the direction of the movement of said cross-piece.
Claim 12
Dependent Claim
68 words
A device as claimed in claim 7, comprising compressed springs fitted over said rods on both sides of each projection with said holes, one end of each spring being butted against one die of said pair of dies and the other, against said projection, thereby these springs separate said dies with the predominantly flat working surfaces from each other, as said plates cease to act upon these dies.
Claim 13
Dependent Claim
52 words
A device as claimed in claim 8, comprising in said arcuate recess of said first die flat longitudinal walls placed at a maximum distance from the bottom of this recess and designed for said second die of said pair of dies with the arcuate recesses to be placed between these longitudinal walls.
Claim 14
Dependent Claim
25 words
A device as claimed in claim 9, comprising said first die with the arcuate recess placed lower than said second die with the arcuate recess.
Claim 15
Dependent Claim
76 words
A device as claimed in claim 10, comprising an opening in the middle of said arcuate recess of said first die; an additional die designed to be arranged by means of a rod in said opening and for the formation of an additional branch in said tubular blank, wherein a hole is made beforehand, whereto said rod is to be plassed; a means for a transfer of said additional diE with the aid of said rod.
Claim 16
Dependent Claim
35 words
A device as claimed in claim 11, comprising an additional cross-piece affixed to said rod with is connected to the additional die, said additional cross-piece being designed to be transferred by means of said plates.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |