US3685751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for granulating thermoplastic materials
Assignee: KraussMaffei Extrusion GmbH
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Filing: 1970-12-15
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Granted: 1972-08-22
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Expires: 1990-12-15
Abstract
Abstract A machine for granulating thermoplastics material includes a cutter head which rotates in a plane parallel to a nozzle plate through which material is extruded. The spacing between the head and plate is adjustable by an arrangement which includes a bush surrounding a spindle carrying the cutter head. An adjustable stop on the bush co-operates with a counter-stop on a differential screw device in order to adjust the spacing. The bush is biased to prevent backlash in the differential screw device.
Inventors
- 👤 Dietmar Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:36
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
In a machine for granulating thermoplastics material comprising a cutter head, a nozzle plate spaced from the cutter head by a small adjustable clearance, means for extruding thermoplastics material through the nozzles of the nozzle plate, a spindle carrying the cutter head, and a bush surrounding at least a part of said spindle, the improvement comprising means defining a stop mounted on said bush, means defining a differential screw adjustement device, a counter-stop co-operating with the screw adjust-ment device and in abutting relationship with the said stop, and means acting continuously on the stop and counter-stop whereby any free-play in the threads of the differential screw thread adjustment device is eliminated.
Claim 2
Dependent Claim
111 words
In a machine for granulating thermoplastics material comprising a cutter head, a nozzle plate spaced from the cutter head by a small adjustable clearance, means for extruding thermoplastics material through the nozzles of the nozzle plate, a spindle carrying the cutter head, and a bush surrounding at least a part of said spindle, the improvement comprising means defining a stop mounted on said bush, means defining a differential screw adjustement device, a counter-stop co-operating with the screw adjust-ment device and in abutting relationship with the said stop, and means acting continuously on the stop and counter-stop whereby any free-play in the threads of the differential screw thread adjustment device is eliminated.
Claim 3
Dependent Claim
22 words
A machine according to claim 1, wherein the stop is in the form of an eccentric that can be adjusted and locked.
Claim 4
Dependent Claim
24 words
A machine according to claim 2, wherein the stop is rotatable about an axis at right angles to the spindle of the cutter head.
Claim 5
Dependent Claim
23 words
A machine according to claim 1, wherein the counter-stop is so mounted as to be capable of axial movement, but not of rotation.
Claim 6
Dependent Claim
37 words
A machine according to claim 1, wherein the differential adjusting device comprises a fixed screw-threaded bush and the screw thereof comprises a first part which screws in said bush and a second part which engages the counterstop.
Claim 7
Dependent Claim
20 words
A machine according to claim 5, in which the threads on the two parts of the screw differ in pitch.
Claim 8
Dependent Claim
15 words
A machine according to claim 5, comprising a dial gauge for monitoring the fine adjustment.
Claim 9
Dependent Claim
17 words
A machine according to claim 7, in which the dial gauge lies in contact with the stop.
Claim 10
Dependent Claim
27 words
A device according to claim 1, wherein said means continuously acting on the stop and counter-stop comprises a piston and cylinder operated by a fluid under pressure.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |