US4052872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stanchions
Assignee: SPRINGBOK APPOINTMENTS Ltd Pty
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Filing: 1975-12-01
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Granted: 1977-10-11
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Expires: 1995-12-01
Abstract
Abstract A method and apparatus for manufacturing a stanchion or tube having at least two integral bulbous portions thereon are disclosed. The method involves defining at least two spaced cavities on the outside of a stanchion tube, the inner surfaces of the cavities being shaped to define the outer contours of the integral bulbous portions of the completed stanchion. A predetermined quantity of flowable and substantially incompressible material within the tube between the inner ends of two oppositely directed rods extending into the tube from the ends thereof, to cause the tube to deform in substantial conformity with the inner surface of the cavities. The process is repeated on any other regions having cavities formed on the outside thereof without firstly removing the rods from the tube.
Inventors
- 👤 Peter Erwin Herr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/10; B21D22/105; B21D15/00; B21D15/04; B21D15/10; B21D15/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T29/53; Y10T29/53709; Y10T29/53717; Y10T29/53722; Y10T29/53996
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
268 words
A method of manufacturing a stanchion or tube having at least two integral bulbous portions thereon comprising the steps of: a. providing at least two spaced fixed split cavities on the outside of a stanchion tube, the inner surfaces of the cavities being shaped to define the outer contours of the integral bulbous portions of the completed stanchion; b. applying a compressive force to a predetermined quantity of flowable and substantially incompressible material within the tube between the inner ends of two rods extending into the tube from the ends thereof, and one of which rods passes completely through the region of one of the cavities, this first compression being effected in the region of the other of the cavities to cause the tube to deform into substantial conformity with the inner surface of the said other cavity; c. releasing the compressive force between the rod ends; d. withdrawing the rod passing completely through the said one cavity such that its end is at least in the region of the end of the said one cavity most remote from the already formed bulbous portion; e. moving the other rod into the region of the said one cavity; f. applying a compressive force to a predetermined quantity of flowable and substantially incompressible material in the latter region to cause the walls of the tube to deform into substantial conformity with the said one cavity, and g. releasing the compressive force on the rods and moving them apart at least sufficiently to enable the tube to be removed therefrom after the split cavities are moved apart to an open position.
Claim 2
Independent Claim
268 words
A method of manufacturing a stanchion or tube having at least two integral bulbous portions thereon comprising the steps of: a. providing at least two spaced fixed split cavities on the outside of a stanchion tube, the inner surfaces of the cavities being shaped to define the outer contours of the integral bulbous portions of the completed stanchion; b. applying a compressive force to a predetermined quantity of flowable and substantially incompressible material within the tube between the inner ends of two rods extending into the tube from the ends thereof, and one of which rods passes completely through the region of one of the cavities, this first compression being effected in the region of the other of the cavities to cause the tube to deform into substantial conformity with the inner surface of the said other cavity; c. releasing the compressive force between the rod ends; d. withdrawing the rod passing completely through the said one cavity such that its end is at least in the region of the end of the said one cavity most remote from the already formed bulbous portion; e. moving the other rod into the region of the said one cavity; f. applying a compressive force to a predetermined quantity of flowable and substantially incompressible material in the latter region to cause the walls of the tube to deform into substantial conformity with the said one cavity, and g. releasing the compressive force on the rods and moving them apart at least sufficiently to enable the tube to be removed therefrom after the split cavities are moved apart to an open position.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 in which the cavities are defined by rigid bulbous elements.
Claim 4
Dependent Claim
28 words
A method as claimed in claim 2 in which the bulbous elements are located in split die assemblies during formation of the integral bulbous portions of the tube.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 1 in which the rods are urged together to effect compression of the material by means of at least one hydraulic piston and cylinder assembly.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 1 in which an axially directed compressive force is applied to the tube during formation of the integral bulbous portions.
Claim 7
Dependent Claim
18 words
A method as claimed in claim 1 in which the said material is a slug of elastomeric material.
References Cited (Backward Citations)
GB887002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |