Patent US3880227A successfully refreshed from Google Patents.
US3880227A
Expired / Lapsed
US
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Arrangement for heating and cooling a double-walled mold
Assignee: THERMOVOX GmbH
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Filing: 1973-06-08
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Granted: 1975-04-29
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Expires: 1993-06-08
Abstract
Abstract An arrangement for heating and cooling a double-walled mold, expecially a mold for molding bodies of plastic material, in which the hollow space between the mold walls is connected by feed and return conduits to a pair of tanks respectively containing a heating and a cooling fluid so that such fluids may be selectively transmitted to the hollow space to cool, respectively heat the mold, and wherein pump means are provided in the return conduits to produce at the connection of the return conduits with the hollow space a suction pressure which is greater than the pressure at which the heating or the cooling fluid enters the hollow space.
Inventors
- 👤 Adolf Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:06
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/34; B29C41/46; B29C35/00; B29C35/007; B29C41/02; B29C41/04; B29C41/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
211 words
An arrangement for heating and cooling a double-walled mold having thin walls, especially for molding bodies of plastic material, said double-walled mold defining between the walls thereof a space adapted to be flown through by a liquid heating or cooling medium, said arrangement comprising a pair of closed pressure tanks located at an elevation higher than that of said mold and respectively adapted to contain a liquid cooling and a liquid heating medium; a feed conduit connecting each of said tanks with said space of said mold for feeding liquid medium by gravity from the respective tank into said space; a return conduit connecting each of said tanks with said space of said mold for returning liquid medium from said space into the respective tank; valve means in each of said conduits for permitting and preventing passage of liquid medium therethrough; a single suction pump provided only in each of said return conduits for producing a suction pressure at the junction of said return conduit with said space which is slightly greater than the pressure at which the respective liquid medium enters said space through said feed conduit; and heat exchanger means in each of said return conduits, downstream of the pump, for heating, respectively cooling the fluid medium passing therethrough.
Claim 2
Dependent Claim
211 words
An arrangement for heating and cooling a double-walled mold having thin walls, especially for molding bodies of plastic material, said double-walled mold defining between the walls thereof a space adapted to be flown through by a liquid heating or cooling medium, said arrangement comprising a pair of closed pressure tanks located at an elevation higher than that of said mold and respectively adapted to contain a liquid cooling and a liquid heating medium; a feed conduit connecting each of said tanks with said space of said mold for feeding liquid medium by gravity from the respective tank into said space; a return conduit connecting each of said tanks with said space of said mold for returning liquid medium from said space into the respective tank; valve means in each of said conduits for permitting and preventing passage of liquid medium therethrough; a single suction pump provided only in each of said return conduits for producing a suction pressure at the junction of said return conduit with said space which is slightly greater than the pressure at which the respective liquid medium enters said space through said feed conduit; and heat exchanger means in each of said return conduits, downstream of the pump, for heating, respectively cooling the fluid medium passing therethrough.
Claim 3
Dependent Claim
28 words
An arrangement as defined in claim 1, and including bypass means for circulating the liquid medium through the respective tank without feeding the liquid medium into said space.
Claim 4
Dependent Claim
41 words
An arrangement as defined in claim 2, wherein said bypass means comprises a conduit connecting the feed conduit of each tank with the return conduit of the respective tank upstream of the pump therein and a valve in each connecting conduit.
Claim 5
Dependent Claim
37 words
An arrangement as defined in claim 2, wherein said bypass means comprises a additional conduit connecting the return conduit of a tank upstream of said pump with the respective tank, and valve means in said additional conduit.
Claim 6
Dependent Claim
24 words
An arrangement as defined in claim 1, and including means mounting the mold turnable rotatably about two axes which are normal to each other.
Claim 7
Dependent Claim
215 words
An arrangement for heating and cooling a double-walled mold having thin walls, especially for molding bodies of plastic material, said double-walled mold defining between the walls thereof a space adapted to be flown through by a liquid heating or cooling medium, said arrangement comprising a pair of closed pressure tanks respectively adapted to contain a liquid cooling and a liquid heating medium and filled with compressed gas above the liquid medium therein; a feed conduit connecting each of said tanks with said space of said mold for feeding liquid medium by the pressure of the compressed gas from the respective tank into said space; a return conduit connecting each of said tanks with said space of said mold for returning liquid medium from said space into the respective tank; valve means in each of said conduits for permitting and preventing passage of liquid medium therethrough; a single suction pump provided only in each of said return conduits for producing a suction pressure at the junction of said return conduit with said space which is slightly greater than the pressure at which the respectively liquid medium enters said space through said feed conduit; and heat exchanger means in each of said return conduits, downstream of the pump, for heating, respectively cooling the fluid medium passing therethrough.
Claim 8
Dependent Claim
215 words
An arrangement for heating and cooling a double-walled mold having thin walls, especially for molding bodies of plastic material, said double-walled mold defining between the walls thereof a space adapted to be flown through by a liquid heating or cooling medium, said arrangement comprising a pair of closed pressure tanks respectively adapted to contain a liquid cooling and a liquid heating medium and filled with compressed gas above the liquid medium therein; a feed conduit connecting each of said tanks with said space of said mold for feeding liquid medium by the pressure of the compressed gas from the respective tank into said space; a return conduit connecting each of said tanks with said space of said mold for returning liquid medium from said space into the respective tank; valve means in each of said conduits for permitting and preventing passage of liquid medium therethrough; a single suction pump provided only in each of said return conduits for producing a suction pressure at the junction of said return conduit with said space which is slightly greater than the pressure at which the respectively liquid medium enters said space through said feed conduit; and heat exchanger means in each of said return conduits, downstream of the pump, for heating, respectively cooling the fluid medium passing therethrough.
Claim 9
Dependent Claim
37 words
An arrangement as defined in claim 6, and including a further conduit connecting the part of one of the tanks which is filled with compressed gas with a feed conduit, and valve means in said further conduit.
Claim 10
Dependent Claim
98 words
An arrangement as defined in claim 6, and including means providing communication between the gas-filled parts of the two tanks. permitting and preventing passage of liquid medium therethrough; a single suction pump provided only in each of said return conduits for producing a suction pressure at the junction of said return conduit with said space which is slightly greater than the pressure at which the respective liquid medium enters said space through said feed conduit; and heat exchanger means in each of said return conduits, downstream of the pump, for heating, respectively cooling the fluid medium passing therethrough.
Claim 11
Dependent Claim
28 words
An arrangement as defined in claim 6, and including bypass means for circulating the liquid medium through the respective tank without feeding the liquid medium into said space.
Claim 12
Dependent Claim
41 words
An arrangement as defined in claim 9, wherein said bypass means comprises a conduit connecting the feed conduit of each tank with the return conduit of the respective tank upstream of the pump therein and a valve in each connecting conduit.
Claim 13
Dependent Claim
37 words
An arrangement as defined in claim 9, whErein said bypass means comprises an additional conduit connecting the return conduit of a tank upstream of said tank with the respective tank, and valve means in said additional conduit.
Claim 14
Dependent Claim
23 words
An arrangement as defined in claim 6 and including means mounting the mold rotatably about two axes which are normal to each other.
References Cited (Backward Citations)
US3259175A
Cited
US3525098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |