Patent US3871801A successfully refreshed from Google Patents.
US3871801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for enclosing expanded plastic material for moulding parts
Assignee: Pont a Mousson SA
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Filing: 1972-11-24
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Granted: 1975-03-18
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Expires: 1992-11-24
Abstract
Abstract A machine for enclosing fine pre-expanded particles for subsequent moulding in a mould, comprising pouring into a moulding cavity of a mould through a large charging opening of the mould, by the effect of gravity and in bulk, a mass of preexpanded but still inflatable particles the volume of which is at least equal to that of the part to be manufactured. The mass is compressed in such manner as to reduce interstitial spaces between the particles and expel a part of the trapped air. The desired volume of the part is completed by charging an excess amount of particles, after which the particles are subjected to an agglomerating treatment by water vapour and/or other agent and the part is stripped from the mould.
Inventors
- 👤 Rudolf C Buchmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/02; B29C44/10; Y; Y10; Y10S; Y10S264/00; Y10S264/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
276 words
A machine for enclosing particles of preexpanded plastics material for subsequent moulding of a part, said machine comprising in combination: a stand, a moulding box supported in a fixed position relative to said stand and having a moulding cavity and a large upper charging opening; a closing cover capable of closing said charging opening in a fluidtight manner; means for locking said cover in the closing position; a mould charging device having a bin whose capacity is at least equal to that of said moulding cavity and has a lower pouring opening having a shape and dimensions substantially corresponding to those of said upper charging opening, said cover and said charging device being vertically movable relative to the moulding box and stand and said bin being capable of descending partly into the moulding cavity; first shifting means for shifting the cover and the charging device vertically with respect to the stand and selectively toward and away from and coaxially of the moulding cavity; at least one of the elements consisting of the cover and the charging device being movable transversely of the moulding box to allow the other of said elements to be shifted toward the moulding box by the first shifting means; closure means for said pouring opening, said closure means being capable of being withdrawn to allow passage for said material substantially throughout said pouring opening to allow the material to fall into said moulding cavity; means for selectively withdrawing said closure means and putting said closure means in their closing position, said closure means being in their closing position capable of compressing said material upon descent of said bin into the mould cavity.
Claim 2
Dependent Claim
276 words
A machine for enclosing particles of preexpanded plastics material for subsequent moulding of a part, said machine comprising in combination: a stand, a moulding box supported in a fixed position relative to said stand and having a moulding cavity and a large upper charging opening; a closing cover capable of closing said charging opening in a fluidtight manner; means for locking said cover in the closing position; a mould charging device having a bin whose capacity is at least equal to that of said moulding cavity and has a lower pouring opening having a shape and dimensions substantially corresponding to those of said upper charging opening, said cover and said charging device being vertically movable relative to the moulding box and stand and said bin being capable of descending partly into the moulding cavity; first shifting means for shifting the cover and the charging device vertically with respect to the stand and selectively toward and away from and coaxially of the moulding cavity; at least one of the elements consisting of the cover and the charging device being movable transversely of the moulding box to allow the other of said elements to be shifted toward the moulding box by the first shifting means; closure means for said pouring opening, said closure means being capable of being withdrawn to allow passage for said material substantially throughout said pouring opening to allow the material to fall into said moulding cavity; means for selectively withdrawing said closure means and putting said closure means in their closing position, said closure means being in their closing position capable of compressing said material upon descent of said bin into the mould cavity.
Claim 3
Dependent Claim
44 words
A machine as claimed in claim 1, comprising second shifting means for shifting at least said one of the elements transversely of the moulding box to allow said other of said elements to be shifted toward the moulding box by the first shifting means.
Claim 4
Dependent Claim
20 words
A machine as claimed in claim 1, wherein the cover and the charging device are both laterally movable in translation.
Claim 5
Dependent Claim
45 words
A machine as claimed in claim 1, wherein said second shifting means comprise a fixed horizontal runway, a carriage movable along the runway, and said first shifting means comprise cylinder devices having a vertical motion suspending the cover and the charging device from the carriage.
Claim 6
Dependent Claim
23 words
A machine as claimed in claim 3, comprising a vertically movable support structure on which the cover and the charging device are mounted.
Claim 7
Dependent Claim
90 words
A machine as claimed in claim 3, wherein said second shifting means comprise a cylinder device, a support pivotably mounted relative to the stand, the cylinder device having one end pivotably mounted relative to the stand and an opposite end pivotably connected to the support so that the cylinder device is capable of moving the support in a curvilinear path, and said first shifting means comprise cylinder devices having a vertical motion in their operative position above the mould respectively connecting the cover and the charging device to the support.
Claim 8
Dependent Claim
13 words
A machine as claimed in claim 1, wherein the cover is transversely movable.
Claim 9
Dependent Claim
40 words
A machine as claimed in claim 7, comprising a vertically movable support structure to which structure the charging device is rigidly secured, the cover being carried by said support structure along which it is movable transversely of the moulding box.
Claim 10
Dependent Claim
27 words
A machine as claimed in claim 8, wherein the charging bin comprises in its lower part transverse passages for permitting a free transverse displacement of the cover.
Claim 11
Dependent Claim
34 words
A machine as claimed in claim 9, wherein the moulding box has an upper edge surface and the bin has a slidable outer sealing means adapted to bear resiliently against the upper edge surface.
Claim 12
Dependent Claim
24 words
A machine as claimed in claim 1, wherein the lower part of the bin has sealing means adapted to slide into the moulding cavity.
Claim 13
Dependent Claim
56 words
A machine as claimed in claim 1, wherein the moulding box has an upper edge surface and the cover comprises a plate adapted to bear against the upper edge surface, and a projecting portion which downwardly projects from said plate which is for compressing the plastics material and is capable of sliding in the moulding cavity.
Claim 14
Dependent Claim
54 words
A machine as claimed in claim 1, wherein the cover comprises a plate, lugs integral with the plate means defining apertures in the lugs, means defining apertures on the moulding box, and detachable pins engaged in the apertures which are brought into alignment with each other for locking the cover to the moulding box.
Claim 15
Dependent Claim
68 words
A machine as claimed in claim 1, wherein the moulding box has a lateral wall which is pivotable for the purpose of opening the moulding box and stripping the part from the mould, and the cover has rigid legs adapted and arranged to be positioned astride lateral walls of the moulding box including said pivotable lateral wall for preventing the pivotable lateral wall from opening the moulding box.
Claim 16
Dependent Claim
23 words
A machine as claimed in claim 14, wherein said legs are part of said means for locking the cover to the moulding box.
References Cited (Backward Citations)
US3042793A
Cited
US3756762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |