Patent US2728967A successfully refreshed from Google Patents.
Patent US3893794A successfully refreshed from Google Patents.
US3893794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming a socket in thermoplastic pipe
Assignee: Renolit Nederland BV
•
Filing: 1973-10-09
•
Granted: 1975-07-08
•
Expires: 1993-10-09
Abstract
Abstract An apparatus for forming a socket on a tube of a thermoplastic material, in which an upsetting movement is effected so that the socketed end is given a wall thickness which is at least equal to the wall thickness of the initial pipe. The apparatus comprises a mandrel, a two-part mold and a thrust member. An annular molding chamber is produced which has a radial dimension which is at least equal to the wall thickness of the pipe to be treated.
Inventors
- 👤 Petrus Marinus Acda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:04
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
234 words
An apparatus for forming a socket in a pipe end, comprising: a mandrel adapted to be inserted in the pipe end, comprising a base part and a removable shaping ring having at least one portion having a diameter greater than the outside diameter of the pipe; clamping means for holding said pipe coaxially with said mandrel; a mold enclosing a cavity coaxial with the mandrel, comprising axially separable first and second parts having a parting face intersecting said cavity at a location of greatest diameter of said cavity, said first mold part at an end away from said parting face and adjacent said clamping means having a first interior cylindrical surface having a diameter substantially equal to the outside diameter of the pipe, said second mold part at an end away from said parting face having a second interior cylindrical surface having a diameter at least equal to said outside diameter; a thrust member having a tubular portion whose wall thickness is at least equal to that of the pipe, said tubular portion slidably mounted on said base part of said mandrel for relative axial motion and having an outside surface slidable within said second interior surface of the second mold part; means for producing relative axial displacement between said clamping member and said mandrel, mold and thrust member; and means for displacing said thrust member axially with respect to said mandrel and mold.
Claim 2
Independent Claim
234 words
An apparatus for forming a socket in a pipe end, comprising: a mandrel adapted to be inserted in the pipe end, comprising a base part and a removable shaping ring having at least one portion having a diameter greater than the outside diameter of the pipe; clamping means for holding said pipe coaxially with said mandrel; a mold enclosing a cavity coaxial with the mandrel, comprising axially separable first and second parts having a parting face intersecting said cavity at a location of greatest diameter of said cavity, said first mold part at an end away from said parting face and adjacent said clamping means having a first interior cylindrical surface having a diameter substantially equal to the outside diameter of the pipe, said second mold part at an end away from said parting face having a second interior cylindrical surface having a diameter at least equal to said outside diameter; a thrust member having a tubular portion whose wall thickness is at least equal to that of the pipe, said tubular portion slidably mounted on said base part of said mandrel for relative axial motion and having an outside surface slidable within said second interior surface of the second mold part; means for producing relative axial displacement between said clamping member and said mandrel, mold and thrust member; and means for displacing said thrust member axially with respect to said mandrel and mold.
Claim 3
Dependent Claim
124 words
An apparatus as claimed in claim 1, wherein said mandrel comprises an insertion end having a conical portion whose diameter decreases from the base part toward the insertion end, and means for preventing radial distortion of the shaping ring during formation of the socket; said shaping ring is slidable on a portion of said base part, and may be slid off said base part and removed over said insertion end, said shaping ring having exterior cylindrical portions of stepwise varying diameters and adjoining conical transition portions; and said mold comprises corresponding internal cylindrical and conical surfaces, the cavity between said mandrel and said mold defining a pipe socket having a wall thickness at least as thick as approximately the wall thickness of the pipe.
Claim 4
Dependent Claim
34 words
An apparatus as claimed in claim 2 wherein said mandrel insertion end comprises a cylindrical portion extending beyond said conical portion, having an outer diameter approximately equal to the inner diameter of the pipe.
Claim 5
Dependent Claim
51 words
An apparatus as claimed in claim 1 wherein the base part of said mandrel further comprises means extending toward an insertion end for contacting a stop surface on said first mold part so as to locate said first part axially with respect to said base part when the mold is closed.
Claim 6
Dependent Claim
48 words
An apparatus as claimed in claim 4 wherein said first mold part is biased axially away from said clamping means, and said second mold part is biased axially away from said thrust member toward said clamp with a biasing force greater than that applied to said first part.
Claim 7
Dependent Claim
31 words
An apparatus as claimed in claim 4, wherein said means for displacing said thrust member is a hydraulic cylinder connected to a portion of the base part end of the mandrel.
Claim 8
Dependent Claim
19 words
An apparatus as claimed in claim 6, wherein said first mold part is longitudinally split along an axial plane.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |