US3785527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus to control feed of material to an extruder
Assignee: KraussMaffei Extrusion GmbH
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Filing: 1973-04-10
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Granted: 1974-01-15
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Expires: 1993-04-10
Abstract
Abstract Control apparatus to control feed of material to an extruder, particularly rubber or plastics material, comprising a housing for a feed screw, a hopper formed as a material feed aperture in the housing and divided into two portions by a baffle seated with a tight seal on the feed screw, a first of the two portions receiving material to be extruded and feeding said material into said second portion, which second portion contains a piston to maintain the material in the second portion in compacted form, means feeding material to the first portion being controlled in dependence upon the position of the piston in the second portion.
Inventors
- 👤 W Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:11
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/285; B29C48/288; B29C48/2888; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/60; B29B7/74; B29B7/7476; B29B7/7495; B29C48/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
Control apparatus, to control feed of material to be extruded to an extruder, comprising a housing; a feed screw rotatably mounted in said housing; a hopper formed as a material feed aperture in said housing; a baffle seated with a tight seal on said feed screw and dividing said material feed aperture into a first portion to receive material to be extruded and a second portion for sensing the amount of material in said hopper; means communicating said first portion with said second portion whereby material fed to said first portion is fed into said second portion; pressure means to maintain material in said second portion in a compacted state; and sensing means to sense the amount of material in said second portion.
Claim 2
Dependent Claim
123 words
Control apparatus, to control feed of material to be extruded to an extruder, comprising a housing; a feed screw rotatably mounted in said housing; a hopper formed as a material feed aperture in said housing; a baffle seated with a tight seal on said feed screw and dividing said material feed aperture into a first portion to receive material to be extruded and a second portion for sensing the amount of material in said hopper; means communicating said first portion with said second portion whereby material fed to said first portion is fed into said second portion; pressure means to maintain material in said second portion in a compacted state; and sensing means to sense the amount of material in said second portion.
Claim 3
Dependent Claim
27 words
Control apparatus as claimed in claim 1, wherein said pressure means comprise a pressure-loaded control piston slidably mounted in said second portion of said material feed aperture.
Claim 4
Dependent Claim
42 words
Control apparatus as claimed in claim 2 wherein said sensing means comprise limit switches and a member on the piston rod of said control piston to operate said limit switches at upper and lower extremities of the stroke of said control piston.
Claim 5
Dependent Claim
32 words
Control apparatus as claimed in claim 3, wherein said limit switches are adapted to control operation of material feeding means which feed material to said first portion of said material feed aperture.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |