US4124422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing flexible pipe with socket section
Assignee: Kubota Corp
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Filing: 1976-05-11
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Granted: 1978-11-07
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Expires: 1996-05-11
Abstract
Abstract A method is disclosed for the production of flexible pipes having a socket in which a socket element is fixed in overlapping relation to one end portion of a fabricated flexible pipe. The end portion of the pipe is elastically reduced in diameter and the socket element overlapped or telescoped with the reduced end portion. The socket element is then fixed to the reduced end portion of the pipe firmly under elastic stress when the reducing pressure is released. An elastic member may be interposed between the end portion of the pipe and the socket element at the overlap.
Inventors
- 👤 Hiroshi Kusano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:25
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29C57/04; B29C65/00; B29C65/56; B29C65/565; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5229; B29C66/52296; B29C66/52298; B29C66/53; B29C66/534; B29C66/5344; B29C66/70; B29C66/72; B29C66/721; B29C66/7212; B29C66/73; B29C66/739; B29C66/7394; F; F16; F16L; F16L47/00; F16L47/06; B29L; B29L2031/00; B29L2031/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A method of producing a flexible pipe with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) elastically contracting the diameter of the one end portion of the pipe, (b) fitting an elastic member on the outer surface of the one end portion of the pipe with an adhesive between the one end portion and the elastic member, (c) bringing a socket element shaping mandrel against the end surface of the pipe, (d) winding resin-impregnated reinforcing fiber around the outer surface of said elastic member and the mandrel to form the socket element, and (e) relieving the elastic diametrical contraction after the resin is set.
Claim 2
Independent Claim
122 words
A method of producing a flexible pipe with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) elastically contracting the diameter of the one end portion of the pipe, (b) fitting an elastic member on the outer surface of the one end portion of the pipe with an adhesive between the one end portion and the elastic member, (c) bringing a socket element shaping mandrel against the end surface of the pipe, (d) winding resin-impregnated reinforcing fiber around the outer surface of said elastic member and the mandrel to form the socket element, and (e) relieving the elastic diametrical contraction after the resin is set.
Claim 3
Dependent Claim
31 words
A method as set forth in claim 1, characterized in that an adhesive is applied to the outer surface of the elastic member around which the resin-impregnated reinforcing fiber is wound.
Claim 4
Dependent Claim
35 words
A method as set forth in claim 1, characterized in that the outer surface of said elastic member is covered with a resin in advance which is chemically resistant to the socket element forming material.
Claim 5
Dependent Claim
78 words
A method as set forth in claim 1, characterized in that a hollow annular body whose cross-sectional shape is variable is fitted over said one end portion of the pipe and a pressure receiving jig which prevents the diametrical expansion of the outer diameter of said hollow annular body is fitted over the outer surface of the latter, whereupon pressurized fluid is fed into the hollow of said hollow annular body to diametrically contract said one end portion.
Claim 6
Independent Claim
140 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) providing a press mold for the shaping of the socket element, (b) fitting the press mold over the outer surface of one end portion of the pipe in a position such that the socket element carried by the press mold overlaps such one end portion of the pipe, (c) elastically reducing the diameter of such one end portion of the pipe by the press mold and in this condition completely forming the socket element, and (d) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directed radially outwardly upon releasing the reduction.
Claim 7
Independent Claim
140 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) providing a press mold for the shaping of the socket element, (b) fitting the press mold over the outer surface of one end portion of the pipe in a position such that the socket element carried by the press mold overlaps such one end portion of the pipe, (c) elastically reducing the diameter of such one end portion of the pipe by the press mold and in this condition completely forming the socket element, and (d) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directed radially outwardly upon releasing the reduction.
Claim 8
Dependent Claim
40 words
A method as set forth in claim 5, characterized in that disposed inside said press mold is a shaping inner mold having an outer shape conforming to the shape of the inner surface of the socket section to be formed.
Claim 9
Dependent Claim
26 words
A method as set forth in claim 6, characterized in that the socket element consisting of unset resin is enclosed and contacted by said press mold.
Claim 10
Dependent Claim
60 words
A method as set forth in claim 6, characterized in that after a reinforcing material is wound around the outer surface of said one end portion of the pipe and around the outer surface of the shaping inner mold, the press mold is fitted over and a resin is poured into the winding of reinforcing material in said press mold.
Claim 11
Dependent Claim
26 words
A method as set forth in claim 5, characterized in that the socket element consisting of unset resin is enclosed and contacted by said press mold.
Claim 12
Independent Claim
205 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) providing a wedge member having an outer surface inclined with respect to the pipe axis, (b) adhesively securing said wedge member to the outer surface of the end portion of the pipe with the larger diametered side of said inclined outer surface positioned outwardly of said one end portion, (c) providing a socket element having an inclined inner surface whose maximum diameter is smaller than the maximum diameter of the inclined outer surface of said wedge member, (d) fitting said socket element in overlapping relation with respect to said end portion of the pipe and moving said socket element relatively toward the outer side of said end portion of the pipe so that the wedge member and socket element are adhesively secured together, (e) elastically reducing the diameter of said end portion of the pipe, and (f) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directly radially outwardly through said wedge member upon releasing the reduction.
Claim 13
Independent Claim
205 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) providing a wedge member having an outer surface inclined with respect to the pipe axis, (b) adhesively securing said wedge member to the outer surface of the end portion of the pipe with the larger diametered side of said inclined outer surface positioned outwardly of said one end portion, (c) providing a socket element having an inclined inner surface whose maximum diameter is smaller than the maximum diameter of the inclined outer surface of said wedge member, (d) fitting said socket element in overlapping relation with respect to said end portion of the pipe and moving said socket element relatively toward the outer side of said end portion of the pipe so that the wedge member and socket element are adhesively secured together, (e) elastically reducing the diameter of said end portion of the pipe, and (f) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directly radially outwardly through said wedge member upon releasing the reduction.
Claim 14
Dependent Claim
18 words
A method as set forth in claim 10, characterized in that said wedge member comprises an elastic member.
Claim 15
Independent Claim
192 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) overlapping the socket element with respect to the end portion of the flexible pipe to provide a clearance therebetween, (b) providing an elastic member thicker than the clearance between the outer surface of the pipe and the inner surface of the socket element, (c) applying an adhesive to the inner and outer surfaces of said elastic member, (d) inserting said elastic member with the adhesive applied thereto into said clearance, (e) inserting an inner mold into said end portion of the pipe, (f) disposing an outer mold about the outer surface of said end portion of the pipe enclosing and contacting the socket element, (g) elastically reducing the diameter of the end portion of the pipe by means of said outer mold, and (h) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directed radially outwardly through said elastic member upon releasing the reduction.
Claim 16
Independent Claim
192 words
A method for the production of flexible pipes with a socket in which to a prefabricated flexible pipe there is fixed a socket element overlapping the end portion of said flexible pipe, characterized by: (a) overlapping the socket element with respect to the end portion of the flexible pipe to provide a clearance therebetween, (b) providing an elastic member thicker than the clearance between the outer surface of the pipe and the inner surface of the socket element, (c) applying an adhesive to the inner and outer surfaces of said elastic member, (d) inserting said elastic member with the adhesive applied thereto into said clearance, (e) inserting an inner mold into said end portion of the pipe, (f) disposing an outer mold about the outer surface of said end portion of the pipe enclosing and contacting the socket element, (g) elastically reducing the diameter of the end portion of the pipe by means of said outer mold, and (h) fixing the socket element in the entire overlap to the reduced end portion of the pipe firmly under the elastic stress thereof directed radially outwardly through said elastic member upon releasing the reduction.
References Cited (Backward Citations)
US3149861A
Cited
US3217400A
Cited
US3036948A
Cited
US3770480A
Cited
US3969170A
Cited
US3971578A
Cited
US3953059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |