Patent US3583189A successfully refreshed from Google Patents.
US3583189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triple die ring corrugator
Assignee: Calumet and Hecla Inc
•
Filing: 1969-10-28
•
Granted: 1971-06-08
•
Expires: 1989-10-28
Abstract
Abstract Apparatus for helically corrugating metal tubing in which guides establish an axis of transit for a tubing to be corrugated and in which three die rings encircle the axis of transit relatively eccentric therewith for indentably engaging the tubing to generate a helical groove therein when relative rotation is imparted between the tubing and the die rings.
Inventors
- 👤 Donald G Kelstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
182 words
Apparatus for helically corrugating metal tubing comprising: guide means establishing an axis of transit for a tubing to be corrugated; a first freely rotatable die ring encircling said axis and eccentric therewith in a first radial direction for indentably engaging said tubing; second and third freely rotatable die rings encircling said axis spaced closely adjacent said first die ring in close coupled relationship on opposite sides thereof forming entrant and exit rings disposed eccentrically relative to said axis in a second radial direction diametrically opposite said first radial direction and having radially inwardly extending annular working surfaces disposed adjacent the axially inner ends thereof for indentably engaging said tubing axially closely adjacent the indentable engagement by said first die ring in the said close coupled relationship therewith to reduce bending moments on the tube; carrier means mounting said first, second and third die rings in said relative eccentric and close coupled relationship; and drive means for rotating one of said tubing and said carrier means generally about said axis to impart axial movement to said tubing and generate a helical groove therein.
Claim 2
Dependent Claim
182 words
Apparatus for helically corrugating metal tubing comprising: guide means establishing an axis of transit for a tubing to be corrugated; a first freely rotatable die ring encircling said axis and eccentric therewith in a first radial direction for indentably engaging said tubing; second and third freely rotatable die rings encircling said axis spaced closely adjacent said first die ring in close coupled relationship on opposite sides thereof forming entrant and exit rings disposed eccentrically relative to said axis in a second radial direction diametrically opposite said first radial direction and having radially inwardly extending annular working surfaces disposed adjacent the axially inner ends thereof for indentably engaging said tubing axially closely adjacent the indentable engagement by said first die ring in the said close coupled relationship therewith to reduce bending moments on the tube; carrier means mounting said first, second and third die rings in said relative eccentric and close coupled relationship; and drive means for rotating one of said tubing and said carrier means generally about said axis to impart axial movement to said tubing and generate a helical groove therein.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1 wherein said first die ring has axially opening cavities at its opposite sides for nestably receiving the tube engaging working surfaces of said second and third die rings in said closely spaced and close coupled relationship.
Claim 4
Dependent Claim
46 words
Apparatus according to claim 2 wherein the positions of indentable engagement of said second and third die rings are spaced longitudinally apart from the position of indentable engagement of said first die ring by 1 1/2 turns of the groove to be formed in the tubing.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 2 wherein said annular working surfaces have inside diameters of greater dimension than the outside diameter of the uncorrugated tubing.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 1 wherein said die rings are disposed at respective angles relative to transverse planes intersecting said axis perpendicularly.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 5 wherein said second and third die rings are inclined oppositely of said first die ring.
Claim 8
Dependent Claim
32 words
Apparatus according to claim 1 wherein said guide means comprise a pair of tubular bushings freely rotatably mounted in said carrier means in axially spaced relationship to admit said die rings therebetween.
Claim 9
Dependent Claim
186 words
Apparatus for helically corrugating metal tubing comprising: guide means establishing an axis of transit for a tubing to be corrugated; a first freely intermediate rotatable die ring encircling said axis and eccentric therewith and having a radial web terminating in an annular working surface for indentably engaging said tubing and presenting cavities to each side of said web; second and third freely rotatable entrant and exit die rings encircling said axis and disposed at least partially within an adjacent cavity to be spaced closely axially adjacent said first die ring on opposite sides thereof and disposed eccentrically relative to said axis with radially inwardly extending annular working surfaces disposed adjacent the axially inner ends thereof for indentably engaging said tubing axially closely adjacent the indentable engagement by said first die ring to reduce bending moments on the tube; carrier means mounting said first, second and third die rings in said relative eccentric and close coupled relationship; and drive means for rotating one of said tubing and said carrier means generally about said axis to impart axial movement to said tubing and generate a helical groove therein.
Claim 10
Dependent Claim
186 words
Apparatus for helically corrugating metal tubing comprising: guide means establishing an axis of transit for a tubing to be corrugated; a first freely intermediate rotatable die ring encircling said axis and eccentric therewith and having a radial web terminating in an annular working surface for indentably engaging said tubing and presenting cavities to each side of said web; second and third freely rotatable entrant and exit die rings encircling said axis and disposed at least partially within an adjacent cavity to be spaced closely axially adjacent said first die ring on opposite sides thereof and disposed eccentrically relative to said axis with radially inwardly extending annular working surfaces disposed adjacent the axially inner ends thereof for indentably engaging said tubing axially closely adjacent the indentable engagement by said first die ring to reduce bending moments on the tube; carrier means mounting said first, second and third die rings in said relative eccentric and close coupled relationship; and drive means for rotating one of said tubing and said carrier means generally about said axis to impart axial movement to said tubing and generate a helical groove therein.
Claim 11
Dependent Claim
37 words
Apparatus according to claim 8 wherein the entrant and exit die rings are inclined forwardly at approximate angles of 10* and 4*, respectively; and the intermediate die ring is inclined rearwardly at an angle of approximately 6*.
Claim 12
Dependent Claim
46 words
Apparatus according to claim 8 wherein the entrant die ring is inclined forwardly at a predetermined angle and the exit die ring inclined forwardly at a lesser angle; and wherein the intermediate die ring is inclined rearwardly at an angle between said predetermined and lesser angles.
Claim 13
Dependent Claim
39 words
Apparatus according to claim 8 wherein the axially inward outer edges of the second and third die rings are relieved with conical tapers to facilitate entry into a corresponding cavity for the nested relationship of the several die rings.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |