US3926219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection nozzle for foaming machines
Assignee: Bayer AG
•
Filing: 1974-12-19
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Granted: 1975-12-16
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Expires: 1994-12-19
Abstract
Abstract An injecting nozzle for injecting reactants into the mixing chamber of a foam machine mixing head wherein the needle which seals the nozzle opening also controls the communication between the feed conduit and the return conduit of the recycle system. The needle by means of an annular groove carried on its shaft or on the nozzle housing or by ''''means'''' of annular grooves on both allows the reactants to recycle through the return conduit when the nozzle opening is sealed but prevents such recirculation when the nozzle opening is open. Thus, the recycle path and the pouring path are identical or almost so and any dynamic disturbance upon changing of modes is eliminated.
Inventors
- 👤 Heinrich Ersfeld
- 👤 Klaus Nadolski
- 👤 Walter Schneider
- 👤 Klaus Schulte
- 👤 Heinrich Boden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:57
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7631; Y; Y10; Y10S; Y10S366/00; Y10S366/604; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86887
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
207 words
An injection nozzle for injecting reactants into the mixing chamber of a foam machine mixing head which comprises a housing having a longitudinal bore adapted to receive a nozzle needle, a nozzle opening located in a traverse wall which terminates one end of said bore, a first traverse bore entering the longitudinal wall of the longitudinal bore at a point adjacent to said nozzle opening, a second traverse bore entering said longitudinal wall at a point remote from the point of entry of said first traverse bore and an annular groove immediately adjacent to said traverse wall; and a nozzle needle slidingly disposed within said longitudinal bore of the housing and having one end adapted to sealingly engage said nozzle opening and the other end coupled to a positive control means for moving said needle a preset longitudinal distance into or out of engagement with said nozzle opening; said nozzle needle being provided with an annular groove so positioned that when the nozzle needle is in sealing engagement with the nozzle opening the annular groove provides communication between said first traverse and said second traverse bores and when said nozzle needle is moved its preset distance out of engagement they provide no communication between said traverse bores.
Claim 2
Dependent Claim
207 words
An injection nozzle for injecting reactants into the mixing chamber of a foam machine mixing head which comprises a housing having a longitudinal bore adapted to receive a nozzle needle, a nozzle opening located in a traverse wall which terminates one end of said bore, a first traverse bore entering the longitudinal wall of the longitudinal bore at a point adjacent to said nozzle opening, a second traverse bore entering said longitudinal wall at a point remote from the point of entry of said first traverse bore and an annular groove immediately adjacent to said traverse wall; and a nozzle needle slidingly disposed within said longitudinal bore of the housing and having one end adapted to sealingly engage said nozzle opening and the other end coupled to a positive control means for moving said needle a preset longitudinal distance into or out of engagement with said nozzle opening; said nozzle needle being provided with an annular groove so positioned that when the nozzle needle is in sealing engagement with the nozzle opening the annular groove provides communication between said first traverse and said second traverse bores and when said nozzle needle is moved its preset distance out of engagement they provide no communication between said traverse bores.
Claim 3
Dependent Claim
85 words
The injection nozzle of claim 1 wherein a cross-channel extends from said first traverse bore to the longitudinal wall of the longitudinal bore at a point distant from the nozzle opening and the nozzle needle is provided with an annular groove so positioned that it provides communication between said cross-channel and said second traverse bore when the needle is in sealing engagement with the nozzle opening and it does not provide such communication when the nozzle needle is moved its preset distance out of engagement.
Claim 4
Dependent Claim
218 words
An injection nozzle for injecting reactants into the mixing chamber of a foam machine mixing head which comprises a housing having a longitudinal bore adapted to receive a nozzle needle, a nozzle opening located in a traverse wall which determines one end of said bore and a first traverse bore entering the longitudinal wall of the longitudinal bore at a point adjacent to said nozzle opening and a second traverse bore entering said longitudinal wall at a point remote from the point of entry of said first traverse bore and an annular groove immediately adjacent to said traverse wall; and a nozzle needle slidingly disposed within said longitudinal bore of the housing and having one end adapted to sealingly engage said nozzle opening and the other end coupled to a positive control means for moving said needle a preset longitudinal distance into or out of engagement with said nozzle opening; said nozzle needle being provided with an annular groove so positioned that when the nozzle needle is in sealing engagement with the nozzle opening the annular groove provides communication between said first traverse and said second traverse bores and at least partially overlaps said housing annular groove but when said nozzle needle is moved its preset distance out of engagement it provides no communication between said traverse bores.
Claim 5
Dependent Claim
218 words
An injection nozzle for injecting reactants into the mixing chamber of a foam machine mixing head which comprises a housing having a longitudinal bore adapted to receive a nozzle needle, a nozzle opening located in a traverse wall which determines one end of said bore and a first traverse bore entering the longitudinal wall of the longitudinal bore at a point adjacent to said nozzle opening and a second traverse bore entering said longitudinal wall at a point remote from the point of entry of said first traverse bore and an annular groove immediately adjacent to said traverse wall; and a nozzle needle slidingly disposed within said longitudinal bore of the housing and having one end adapted to sealingly engage said nozzle opening and the other end coupled to a positive control means for moving said needle a preset longitudinal distance into or out of engagement with said nozzle opening; said nozzle needle being provided with an annular groove so positioned that when the nozzle needle is in sealing engagement with the nozzle opening the annular groove provides communication between said first traverse and said second traverse bores and at least partially overlaps said housing annular groove but when said nozzle needle is moved its preset distance out of engagement it provides no communication between said traverse bores.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |