US3690802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of hollow objects, in particular bottles of thermoplastic material utilizing injection blowing method
Assignee: Individual
•
Filing: 1970-08-26
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Granted: 1972-09-12
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Expires: 1990-08-26
Abstract
Abstract An apparatus for the production of hollow articles, such as bottles, from thermoplastic synthetic plastic material by the injection and blowing process, having an extruder, an injection mould, a blowing mould arranged at a distance therefrom and a transport or transmission device which bring the pre-mouldings formed in said injection mould into said blowing mould after removal from said injection mould. The apparatus includes several intermittently advanceable blowing mandrels formed as mould cores for the injection mould, which are provided with supply conduits for a heating or cooling medium as well as a blowing air supply conduit, the cooling or heating medium throughflow conduits of all blowing mandrels are connected one behind the other and the cooling or heating medium flows successively through all blowing mandrels.
Inventors
- 👤 Stefan Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:23
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/4242; B29C49/42421; B29C49/42422; B29C49/02; B29C49/06; B29C49/061; B29C49/062; B29C49/063; B29C49/64; B29C49/6409; B29C49/6463; B29C35/00; B29C35/16; B29C2035/1616; B29C2049/023; B29C2949/00; B29C2949/07; B29C2949/0715; B29C35/02; B29C35/04; B29C35/041
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
185 words
In a blow moulding machine having an extruder, an injection mould and a blowing mould, a transport device for bringing the pre-mouldings formed in the injection mould into the blowing mould; said machine adapted for the production of hollow articles, such as bottles, from thermoplastic synthetic plastic material, and comprising several intermittently advanceable blowing mandrels formed as mould cores about a central hub forming a mandrel star for said injection and blowing moulds, each of said mould cores being provided with supply conduits for a heating or cooling medium as well as a blowing air supply conduit, the cooling or heating medium throughflow conduits of all of said blowing mandrels being serially arranged and connected one behind the other so that the cooling or heating medium flows successively through all of said blowing mandrels, each of which at any one time is in a different step of the working cycle of said machine, whereby irregular heating or cooling of said mandrels is substantially eliminated and precision temperature control of said pre-mouldings is achieved at any one point or step in the cycle of said machine.
Claim 2
Dependent Claim
185 words
In a blow moulding machine having an extruder, an injection mould and a blowing mould, a transport device for bringing the pre-mouldings formed in the injection mould into the blowing mould; said machine adapted for the production of hollow articles, such as bottles, from thermoplastic synthetic plastic material, and comprising several intermittently advanceable blowing mandrels formed as mould cores about a central hub forming a mandrel star for said injection and blowing moulds, each of said mould cores being provided with supply conduits for a heating or cooling medium as well as a blowing air supply conduit, the cooling or heating medium throughflow conduits of all of said blowing mandrels being serially arranged and connected one behind the other so that the cooling or heating medium flows successively through all of said blowing mandrels, each of which at any one time is in a different step of the working cycle of said machine, whereby irregular heating or cooling of said mandrels is substantially eliminated and precision temperature control of said pre-mouldings is achieved at any one point or step in the cycle of said machine.
Claim 3
Dependent Claim
25 words
The apparatus according to claim 1, wherein the supply of the cooling or heating medium takes place at the mandrel situated in the blowing position.
Claim 4
Dependent Claim
29 words
The apparatus according to claim 2, wherein the cooling or heating medium flows through the blowing mandrels successively in the direction of the intermittent further stepping of the mandrels.
Claim 5
Dependent Claim
24 words
The apparatus according to claim 2, wherein the cooling or heating medium flows through the blowing mandrels successively contrarily of the further stepping direction.
Claim 6
Dependent Claim
56 words
The apparatus according to claim 2, wherein the connection of the cooling or heating medium passages of the mandrels with one another and the supply and withdrawal of the cooling or heating medium take place through connection conduits in a spindle on which said hub of the blowing mandrel star is rotatable with its supply passages.
Claim 7
Dependent Claim
50 words
The apparatus according to claim 5, wherein there is arranged in at least one of the parts movable in relation to one another a radially movable sealing piece containing the connection conduits, which bears with a certain pressure on the other of the parts movable in relation to one another.
Claim 8
Dependent Claim
19 words
The apparatus according to claim 6, wherein the application pressure of the sealing piece is achieved by spring effect.
Claim 9
Dependent Claim
45 words
The apparatus according to claim 7, wherein radially movable sealing pieces are inserted into the spindle, each of which pieces covers over the supply passage and the discharge passage of two adjacent blowing mandrels and is in turn sealed off in relation to the spindle.
Claim 10
Dependent Claim
23 words
The apparatus according to claim 8, wherein the seal ensures the resilient abutment pressure of said sealing pieces by reason of its dispositions.
Claim 11
Dependent Claim
27 words
The apparatus according to claim 9, wherein shunt conduits are provided connectable in parallel with parts of the series connection of the cooling or heating medium conduit.
Claim 12
Dependent Claim
16 words
The apparatus according to claim 10, wherein the throughflow quantity in the shunt conduits is regulable.
Claim 13
Dependent Claim
24 words
The apparatus according to claim 11, wherein the throughflow cross-section of at least one of said main conduit or said auxiliary conduits is variable.
Claim 14
Dependent Claim
19 words
The apparatus according to claim 12, wherein the length and/or position of said shunt conduit are selectable and/or variable.
Claim 15
Dependent Claim
34 words
The apparatus according to claim 13, wherein two or more shunt conduits which may be provided with different position and/or length can be connected in parallel with one section of the main throughflow conduit.
Claim 16
Dependent Claim
34 words
The apparatus according to claim 14, wherein a bore or opening, connecting the supply conduit for the throughflow medium with its outlet conduit, as shunt to the entire throughflow conduit of said blowing mandrel.
Claim 17
Dependent Claim
50 words
The apparatus according to claim 15, characterized in that in blowing mandrels having coaxially arranged inlet and return conduits for the cooling or heating medium, further shunt bores or openings are provided in distribution over the length of these passages, which connect the inlet and return conduits with one another.
Claim 18
Dependent Claim
58 words
The apparatus according to claim 16, wherein three coaxial throughflow passages are provided for the cooling or heating medium in said blowing mandrel, of which the two outer are more or less greatly connectable with one another and the throughflow medium can be deflected out of one of these two passages more or less intensely into the other.
Claim 19
Dependent Claim
33 words
The apparatus according to claim 17, wherein the deflection of the throughflow medium from one passage into the other and back is accomplished by constrictions in these passages which may be displaceably formed.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |