EP0343973A1 - Improvenments in helically formed tubing - Google Patents
Improvenments in helically formed tubing Download PDFInfo
- Publication number
- EP0343973A1 EP0343973A1 EP89305279A EP89305279A EP0343973A1 EP 0343973 A1 EP0343973 A1 EP 0343973A1 EP 89305279 A EP89305279 A EP 89305279A EP 89305279 A EP89305279 A EP 89305279A EP 0343973 A1 EP0343973 A1 EP 0343973A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clinching
- seam
- strip
- tubing
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
Definitions
- This invention concerns improvements in and relating to helically formed tubing.
- Such helically formed lock-seam tubing has a variety of uses.
- the tubing is usually of generally cylindrical configuration, although for some purposes it is desired that the tubing be corrugated. Corrugation of lock-seam tubing requires additional manufacturing steps that correspondingly increase the cost of the tubing.
- an object of the invention is to provide a simple means of forming corrugated, helically wound tubing.
- this object is achieved by providing that a pair of rollers arranged to engage internal and external surfaces of the tubing during forming thereof, in order to effect finishing of the seam in the tubing,are further so shaped and arranged that they serve the additional function of forming a helical corrugation in the wall of the tubing, in the region of the finished seam.
- the invention accordingly provides a novel tube forming process, a machine for carrying out such process, and an improved corrugated tube helically formed by such a process.
- the single figure of the accompanying drawing is a sectional elevation of the forming head of a machine for the production of helically wound lock-seam tubing, shown in the process of forming such tubing.
- the reference numeral 1 illustrates the forming head of a machine for the production of helical lock-seam tubing.
- the machine is of generally known type including means for feeding a metal strip into the forming head 1, and means for forming on the longitudinal edges of the metal strip flanges that are interlocked with one another in the finished tubing.
- Such features of the machine will be familiar to one skilled in the art of the production of helically wound lock-seam tubing, and will therefore not be further described in detail.
- the machine is provided with a pair of clinching rollers 2 and 3, of which the roller 2 is supported for rotation within the tubing at the point of formation of a closed helix of the metal strip, via a bracket 4 secured to the forming head 1.
- the roller 3 is mounted externally of the tubing via a further bracket 5 secured to the frame of the machine in a manner not shown.
- the external roller 3 has a circumferential groove 6 which, in cooperation with the circumference of roller 2 serves to effect closure and compression of the lock-seam of the tubing substantially in the manner of known machines.
- the groove 6 of roller 3 is located within a recess defined by a further groove 7 of the clinching roller 3.
- the roller 2 is of correspondingly larger diameter, or is displaced radially relatively to the axis of the formed tubing, so that it extends into the groove 7 of the clinching roller 3.
- the invention provides for the production of helically corrugated lock-seam tubing wherein the lock-seam and the corrugation are formed simultaneously in a simple manner without the requirement of additional post-forming steps as needed in hitherto known processes.
Abstract
Description
- This invention concerns improvements in and relating to helically formed tubing.
- It is known to form metal tubing by winding helically a strip of sheet metal and joining the marginal edges of adjacent helices of the metal strip by clinching together marginal flanges formed on the strip whereby the flanges are interlocked to form a seam.
- Such helically formed lock-seam tubing has a variety of uses. The tubing is usually of generally cylindrical configuration, although for some purposes it is desired that the tubing be corrugated. Corrugation of lock-seam tubing requires additional manufacturing steps that correspondingly increase the cost of the tubing.
- Accordingly an object of the invention is to provide a simple means of forming corrugated, helically wound tubing.
- In accordance with the invention this object is achieved by providing that a pair of rollers arranged to engage internal and external surfaces of the tubing during forming thereof, in order to effect finishing of the seam in the tubing,are further so shaped and arranged that they serve the additional function of forming a helical corrugation in the wall of the tubing, in the region of the finished seam. The invention accordingly provides a novel tube forming process, a machine for carrying out such process, and an improved corrugated tube helically formed by such a process.
- Further preferred features and advantages of the invention will become apparent from the accompanying description of one example of the invention, taken in conjunction with the accompanying drawing and any accompanying Claims.
- The single figure of the accompanying drawing is a sectional elevation of the forming head of a machine for the production of helically wound lock-seam tubing, shown in the process of forming such tubing.
- Referring to the drawing, the reference numeral 1 illustrates the forming head of a machine for the production of helical lock-seam tubing. The machine is of generally known type including means for feeding a metal strip into the forming head 1, and means for forming on the longitudinal edges of the metal strip flanges that are interlocked with one another in the finished tubing. Such features of the machine will be familiar to one skilled in the art of the production of helically wound lock-seam tubing, and will therefore not be further described in detail.
- Suffice it to say that at the point in the machine at which the finished lock-seam is produced, the machine is provided with a pair of
clinching rollers 2 and 3, of which theroller 2 is supported for rotation within the tubing at the point of formation of a closed helix of the metal strip, via abracket 4 secured to the forming head 1. The roller 3 is mounted externally of the tubing via afurther bracket 5 secured to the frame of the machine in a manner not shown. - The external roller 3 has a circumferential groove 6 which, in cooperation with the circumference of
roller 2 serves to effect closure and compression of the lock-seam of the tubing substantially in the manner of known machines. However, unlike known machines the groove 6 of roller 3 is located within a recess defined by afurther groove 7 of the clinching roller 3. Theroller 2 is of correspondingly larger diameter, or is displaced radially relatively to the axis of the formed tubing, so that it extends into thegroove 7 of the clinching roller 3. - As a result of the above described construction of
rollers 2 and 3, a lock-seam 8 formed on the finished tubing is displaced outwardly so that it lies at the crest of a helical corrugation 9 formed in the finished tubing. - Accordingly, the invention provides for the production of helically corrugated lock-seam tubing wherein the lock-seam and the corrugation are formed simultaneously in a simple manner without the requirement of additional post-forming steps as needed in hitherto known processes.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8812370 | 1988-05-25 | ||
GB888812370A GB8812370D0 (en) | 1988-05-25 | 1988-05-25 | Improvements in helically formed tubing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0343973A1 true EP0343973A1 (en) | 1989-11-29 |
EP0343973B1 EP0343973B1 (en) | 1992-08-12 |
Family
ID=10637508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890305279 Expired EP0343973B1 (en) | 1988-05-25 | 1989-05-24 | Improvenments in helically formed tubing |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0343973B1 (en) |
AU (1) | AU3685189A (en) |
CA (1) | CA1337963C (en) |
DE (1) | DE68902423T2 (en) |
ES (1) | ES2034630T3 (en) |
GB (1) | GB8812370D0 (en) |
WO (1) | WO1989011351A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6003220A (en) * | 1995-03-08 | 1999-12-21 | Protol A. G. | Method and apparatus for producing helically wound lock-seam tubing |
SE507901C2 (en) * | 1995-03-08 | 1998-07-27 | Protol Ag | Method and apparatus for making spiral-folded tubes, and such spiral-folded tubes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE57341C (en) * | E. zimmermann in Berlin N., Uferstr. 6a 1 Tr | Device for the production of tubes from a smooth sheet metal strip by winding it together in a helical manner | ||
GB1599379A (en) * | 1978-05-31 | 1981-09-30 | Spiro Investment Sa | Tube-forming machines |
EP0273312A2 (en) * | 1986-12-22 | 1988-07-06 | Pacific Roller Die Co., Inc. | Method for welding ribbed pipe |
-
1988
- 1988-05-25 GB GB888812370A patent/GB8812370D0/en active Pending
-
1989
- 1989-05-24 ES ES89305279T patent/ES2034630T3/en not_active Expired - Lifetime
- 1989-05-24 EP EP19890305279 patent/EP0343973B1/en not_active Expired
- 1989-05-24 CA CA 600586 patent/CA1337963C/en not_active Expired - Fee Related
- 1989-05-24 DE DE1989602423 patent/DE68902423T2/en not_active Expired - Fee Related
- 1989-05-25 WO PCT/GB1989/000582 patent/WO1989011351A1/en unknown
- 1989-05-25 AU AU36851/89A patent/AU3685189A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE57341C (en) * | E. zimmermann in Berlin N., Uferstr. 6a 1 Tr | Device for the production of tubes from a smooth sheet metal strip by winding it together in a helical manner | ||
GB1599379A (en) * | 1978-05-31 | 1981-09-30 | Spiro Investment Sa | Tube-forming machines |
EP0273312A2 (en) * | 1986-12-22 | 1988-07-06 | Pacific Roller Die Co., Inc. | Method for welding ribbed pipe |
Also Published As
Publication number | Publication date |
---|---|
AU3685189A (en) | 1989-12-12 |
WO1989011351A1 (en) | 1989-11-30 |
GB8812370D0 (en) | 1988-06-29 |
CA1337963C (en) | 1996-01-23 |
DE68902423D1 (en) | 1992-09-17 |
DE68902423T2 (en) | 1993-02-04 |
EP0343973B1 (en) | 1992-08-12 |
ES2034630T3 (en) | 1993-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4197728A (en) | Flexible piping method and apparatus of producing same | |
CN100488756C (en) | Composite strip capable of winding to form a helical pipe and method thereof | |
US4368088A (en) | Method of manufacturing corrugated tube | |
US3981172A (en) | Method and apparatus for expanding spirally welded pipe | |
US1580760A (en) | Method and apparatus for making flexible metal lined tubes | |
US4058997A (en) | Apparatus for manufacturing tubes | |
EP0343973A1 (en) | Improvenments in helically formed tubing | |
KR19980702841A (en) | Method and apparatus for manufacturing spirally wound fixed seam | |
CA2065196C (en) | Flexible metal conduit and method of making the same | |
GB2213748A (en) | Machine for producing spirally-seamed corrugated metal tubing | |
EP0845311A1 (en) | Silencer shell forming apparatus | |
US3677047A (en) | Forming of tubular metal ducting | |
US7117709B2 (en) | Flange sleeve and method for the production thereof | |
US3635063A (en) | Manufacture of ring gear and other ring blanks | |
US3918283A (en) | Tubular articles and method of making same | |
JP2754070B2 (en) | Rope receiving drum and method of manufacturing the same | |
WO1994007620A1 (en) | Improvements in and relating to machines for forming helically wound lock-seam tubing having multiple wall thickness | |
US3240042A (en) | Fabricated tubing and the method and apparatus for producing the same | |
US2049100A (en) | Helical bellows and method of making the same | |
US2157598A (en) | Apparatus and method for corrugating metal tubing | |
HU223347B1 (en) | Method and apparatus for producing helically wound lock-seam tubing | |
US3280851A (en) | Fabricated finned tubing | |
SU1011060A3 (en) | Method for making magnetic circuit of stator for dc generator | |
IL41655A (en) | Method and apparatus for joining the edges of two metal sheet portions together | |
US3457749A (en) | Flexible tube forming machine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE ES FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19900321 |
|
17Q | First examination report despatched |
Effective date: 19910222 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE ES FR GB IT NL SE |
|
REF | Corresponds to: |
Ref document number: 68902423 Country of ref document: DE Date of ref document: 19920917 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: DOTT. FRANCO CICOGNA |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2034630 Country of ref document: ES Kind code of ref document: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
EAL | Se: european patent in force in sweden |
Ref document number: 89305279.5 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19970524 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 728V |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 728Y |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980515 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19980527 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980528 Year of fee payment: 10 Ref country code: ES Payment date: 19980528 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19980531 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19980602 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980625 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990524 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990525 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19990525 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990531 |
|
BERE | Be: lapsed |
Owner name: S.A. SPIRO MACHINES Effective date: 19990531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19991201 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990524 |
|
EUG | Se: european patent has lapsed |
Ref document number: 89305279.5 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000131 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19991201 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000301 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20020304 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050524 |