Patent US3782877A successfully refreshed from Google Patents.
US3782877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for separating the surplus of thermoplastic material from the neck portions of blow-molded containers
Assignee: Bekum Maschinenfabriken GmbH
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Filing: 1971-04-13
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Granted: 1974-01-01
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Expires: 1991-04-13
Abstract
Abstract The funnel-shaped surplus of thermoplastic material which is partially separated from the neck portion of a container formed in the mold of a blow molding machine is held by a sleeve which is movable axially of and surrounds the blowing mandrel. Prior to separation of the neck portion of a freshly formed container from the calibrating end of the mandrel, the neck portion and the surplus material are subjected to an intensive cooling action and the sleeve is then moved angularly and/or axially of the mandrel, or vice versa, to effect full separation of the surplus material from the neck portion. The container is thereupon separated from the mandrel prior to separation of surplus material from the sleeve, and the surplus material is deflected laterally to be collected independently of the containers.
Inventors
- 👤 G Mehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:34
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/50; Y; Y10; Y10S; Y10S425/00; Y10S425/806
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
202 words
In a blow molding machine wherein deformable thermoplastic blanks are converted into containers having neck portions, a combination comprising an open-and-shut mold arranged to accommodate a blank; a blow mandrel having a calibrating portion and movable axially to introduce said calibrating portion into said mold with attendant conversion of a portion of the blank in said mold into the neck portion of a container and into a ring constituting a surplus of thermoplastic material which adheres to the neck portion; severing means surrounding said mandrel and arranged to cooperate with said mold to effect an at least partial separation of the surplus from the neck portion; a sleeve surrounding said mandrel and arranged to penetrate into the surplus; means for effecting a relative axial movement between said sleeve and said mandrel to thereby lift and completely separate the surplus which is held by said sleeve from the neck portion on said calibrating portion; means on said sleeve for retaining the surplus on said sleeve after penetration of the latter into said surplus and during relative movement between said sleeve and said mandrel; and stripping means for separating the surplus from said sleeve and said means for retaining said surplus on said sleeve.
Claim 2
Dependent Claim
202 words
In a blow molding machine wherein deformable thermoplastic blanks are converted into containers having neck portions, a combination comprising an open-and-shut mold arranged to accommodate a blank; a blow mandrel having a calibrating portion and movable axially to introduce said calibrating portion into said mold with attendant conversion of a portion of the blank in said mold into the neck portion of a container and into a ring constituting a surplus of thermoplastic material which adheres to the neck portion; severing means surrounding said mandrel and arranged to cooperate with said mold to effect an at least partial separation of the surplus from the neck portion; a sleeve surrounding said mandrel and arranged to penetrate into the surplus; means for effecting a relative axial movement between said sleeve and said mandrel to thereby lift and completely separate the surplus which is held by said sleeve from the neck portion on said calibrating portion; means on said sleeve for retaining the surplus on said sleeve after penetration of the latter into said surplus and during relative movement between said sleeve and said mandrel; and stripping means for separating the surplus from said sleeve and said means for retaining said surplus on said sleeve.
Claim 3
Dependent Claim
53 words
A combination as defined in claim 1, wherein said stripping device comprises a member having an opening large enough to permit passage of said sleeve but too small to permit passage of the surplus so that the surplus is intercepted by said member in response to movement of said sleeve through said opening.
Claim 4
Dependent Claim
50 words
A combination as defined in claim 1, wherein said mold has a conical surface and said severing means has an annular cutting edge which severs said portion of the blank and strikes against said conical surface in response to penetration of said calibrating portion into said portion of the blank.
Claim 5
Dependent Claim
32 words
A combination as defined in claim 1, wherein said sleeve has a conical portion which is arranged to penetrate into the surplus and is provided with surplus-retaining projections constituting said retaining means.
Claim 6
Dependent Claim
33 words
A combination as defined in claim 1, further comprising means for rotating said sleeve with reference to said mandrel in the course of said relative axial movement between said sleeve and said mandrel.
Claim 7
Dependent Claim
31 words
A combination as defined in claim 5, wherein said means for rotating comprises a helical slot in said sleeve and a pin secured to said mandrel and extending into said slot.
Claim 8
Dependent Claim
55 words
A combination as defined in claim 1, wherein said stripping means comprises a second sleeve surrounding said first mentioned sleeve and means for holding said second sleeve against axial movement while said first mentioned sleeve moves axially to move the surplus against said second sleeve with attendant separation of surplus from said first mentioned sleeve.
Claim 9
Dependent Claim
21 words
A combination as defined in claim 7, further comprising resilient means for biasing said sleeves axially and away from each other.
Claim 10
Dependent Claim
24 words
A combination as defined in claim 1, wherein said severing means comprises a discrete annular cutting device which is movable axially of said sleeve.
Claim 11
Dependent Claim
17 words
A combination as defined in claim 9, wherein said cutting device is movable axially of said mandrel.
Claim 12
Dependent Claim
46 words
A combination as defined in claim 10, further comprising a cylinder connected with said cutting device, a piston connected with said mandrel and received in said cylinder, and biasing means for biasing said piston in a direction to withdraw said calibrating portion into said cutting device.
Claim 13
Dependent Claim
26 words
A combination as defined in claim 11, wherein said sleeve surrounds said cutting device and a portion of said cutting device normally extends from said sleeve.
Claim 14
Dependent Claim
85 words
A combination as defined in claim 9, wHerein said cutting device is rigid with said mandrel and said sleeve comprises a projection, said stripping means including a stationary member having an opening for said sleeve and being arranged to intercept said projection to thereby arrest the sleeve while said mandrel moves axially toward said mold, and further comprising resilient means arranged to store energy in response to movement of said mandrel toward the mold while said sleeve is held against movement by said stationary member.
Claim 15
Dependent Claim
28 words
A combination as defined in claim 13, further comprising a crosshead secured to said mandrel and tie rods secured to said projection and slidably extending through said crosshead.
Claim 16
Dependent Claim
47 words
A combination as defined in claim 14, further comprising means for moving said mandrel axially and including a motion transmitting member connected to the end of said mandrel opposite said calibrating portion, said crosshead being disposed between said end of said mandrel and said motion transmitting member.
Claim 17
Dependent Claim
71 words
A combination as defined in claim 1, wherein said mold includes a plurality of sections having surfaces which abut against each other in the closed position of said mold, said surfaces having recesses defining cavities flanking the neck portion of a container in said mold and arranged to receive wing-shaped portions of the surplus in response to introduction of said calibrating portion into said portion of the blank in said mold.
Claim 18
Dependent Claim
29 words
A combination as defined in claim 16, wherein said mold sections have cutting edges arranged to sever the wing-shaped portions of the surplus from the container in said mold.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |