Patent US4256679A successfully refreshed from Google Patents.
US4256679A
Expired / Lapsed
US
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Process and device for filling cavities, particularly mold cavities, with a reactive, flowable mixture
Assignee: Maschinenfabrik Hennecke GmbH
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Filing: 1979-06-28
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Granted: 1981-03-17
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Expires: 1999-06-28
Abstract
Abstract The instant invention broadly relates to a process and apparatus for filling a cavity with a reactive mixture. More particularly, the invention relates to a process for filling cavities, particularly mold cavities, with a reactive, flowable mixture which preferably forms foam, wherein at least two reaction components are brought into a mixing zone, where they are mixed and then brought into the cavity, the improvement wherein at the beginning of the filling process, during a limited time interval, the reaction mixture is fed into the cavity under low flow velocity until the mixture has reached a certain level in the cavity, and subsequently the remaining mixture to be injected, is fed in under increased flow velocity.
Inventors
- 👤 Ulrich Osinski
- 👤 Rene Kummer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:32
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/365; B29C31/00; B29C31/04; B29C31/041; B29K; B29K2105/00; B29K2105/0002; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
106 words
In a process for filling a mold with a reactive, flowable mixture which preferably forms foam, wherein at least two reaction components are brought into a mixing means, where said components are mixed and subsequently brought into a cavity of a mold, the improvement wherein, at the beginning of the filling process, a first portion of the reaction mixture is fed into the cavity of said mold under low flow velocity until the mixture has reached a preselected level in the cavity of said mold, less than full, and subsequently the remaining portion of the mixture to be injected is fed in under increased flow velocity.
Claim 2
Dependent Claim
106 words
In a process for filling a mold with a reactive, flowable mixture which preferably forms foam, wherein at least two reaction components are brought into a mixing means, where said components are mixed and subsequently brought into a cavity of a mold, the improvement wherein, at the beginning of the filling process, a first portion of the reaction mixture is fed into the cavity of said mold under low flow velocity until the mixture has reached a preselected level in the cavity of said mold, less than full, and subsequently the remaining portion of the mixture to be injected is fed in under increased flow velocity.
Claim 3
Dependent Claim
88 words
The process of claim 1, wherein said remaining portion is stored in a variable volume storage means until said preselected level in the cavity of said mold is reached by said first portion of the reaction mixture, and wherein said remaining portion is injected into the cavity of said mold once said preselected level is reached and that towards the end of the filling process the volume of said storage means is decreased to a minimum and the stored mixture is pushed into the cavity of said mold.
Claim 4
Dependent Claim
16 words
The process of claim 2, wherein said storage means is simultaneously used as a mixing means.
Claim 5
Dependent Claim
15 words
The process of claim 2, wherein the minimum volume of said storage means is zero.
Claim 6
Dependent Claim
21 words
The process of claim 1, wherein the reaction mixture is injected into the cavity of said mold at its lowest point.
Claim 7
Dependent Claim
13 words
The process of claim 2, wherein said storage means is kept under pressure.
Claim 8
Dependent Claim
23 words
The process of claim 2, wherein the volume change of said storage means is caused by an expandable wall of said storage means.
Claim 9
Dependent Claim
13 words
The process of claim 7, wherein said expandable wall is an elastic membrane.
Claim 10
Dependent Claim
83 words
In an apparatus for introducing reactive components into a cavity comprising an interconnecting mold and mixing means, the exit opening of said mixing means corresponding to the feed opening of said mold and component feed lines leading to said mixing means, the improvement wherein said mixing means is connected to a storage means, whose walls at least partially consist of an elastic membrane, behind which an elastic membrane cavity is arranged, said membrane being connected with a pressure source and a venting nozzle.
Claim 11
Dependent Claim
83 words
In an apparatus for introducing reactive components into a cavity comprising an interconnecting mold and mixing means, the exit opening of said mixing means corresponding to the feed opening of said mold and component feed lines leading to said mixing means, the improvement wherein said mixing means is connected to a storage means, whose walls at least partially consist of an elastic membrane, behind which an elastic membrane cavity is arranged, said membrane being connected with a pressure source and a venting nozzle.
Claim 12
Dependent Claim
20 words
The apparatus of claim 9, wherein said elastic membrane cavity is separated from the reactive components by said elastic membrane.
Claim 13
Dependent Claim
27 words
The apparatus of claim 9, wherein said elastic membrane and the opposite wall form an angle which opens toward the cavity of said mold to be filled.
Claim 14
Dependent Claim
16 words
The apparatus of claim 9, wherein said membrane is attached to a housing by a frame.
Claim 15
Dependent Claim
25 words
The apparatus of claim 12, wherein said frame is designed as a seal to prevent reaction mixture from entering the cavity behind said elastic membrane.
Claim 16
Dependent Claim
83 words
In an apparatus for introducing reactive components into a cavity comprising an interconnecting mold and a mixing means, the exit opening of said mixing means corresponding to the feed opening of said mold, and component feed lines leading to said mixing means, the improvement wherein said mixing means is immediately connected with a storage means whose volume can be changed opposite its exit direction by a movable piston, wherein the maximum volume of the storage chamber is a multiple of the minimum volume.
Claim 17
Dependent Claim
83 words
In an apparatus for introducing reactive components into a cavity comprising an interconnecting mold and a mixing means, the exit opening of said mixing means corresponding to the feed opening of said mold, and component feed lines leading to said mixing means, the improvement wherein said mixing means is immediately connected with a storage means whose volume can be changed opposite its exit direction by a movable piston, wherein the maximum volume of the storage chamber is a multiple of the minimum volume.
Claim 18
Dependent Claim
13 words
The apparatus of claim 14, wherein said storage chamber contains said mixing means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |