US3675374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct pressure treating device
Assignee: Pangborn Corp
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Filing: 1970-11-09
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Granted: 1972-07-11
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Expires: 1990-11-09
Abstract
Abstract A direct pressure treating device includes a nozzle and a lower chamber communicating with the nozzle. A middle chamber is disposed between the lower chamber and an upper chamber, while the upper chamber communicates with a feed hopper. A first valve is arranged between the lower and middle chamber, a second valve is between the middle and upper chambers, and a third valve is between the upper chamber and feed hopper. At least one of these valve is diaphragm operated with the diaphragm being arranged in a closed housing and disposed in such a manner as to overcome the force of sealing means for thereby opening the valve.
Inventors
- 👤 Harvey H Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:12
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0046
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
180 words
A direct pressure treating device comprising a treating nozzle, a lower chamber communicating with said nozzle, a middle chamber communicating with said lower chamber, an upper chamber communicating with said middle chamber, a feed hopper communicating with said upper chamber through an outlet opening, a first valve between said lower chamber and said middle chamber, a second valve between said middle chamber and said upper chamber, a third valve between said upper chamber and said feed hopper, said third valve being a slidable gate valve having an opening movable into and out of registry with the outlet opening of said feed hopper, said first and second of said valves being a diaphragm operated valve and including a valve seat, a closure member for selectively seating against said seat for closing communication therethrough, a diaphragm, transmitting means connecting said diaphragm to said closure member, a housing, said diaphragm being in said housing, sealing means for urging said closure member against said seat, and pressure means connected to said housing for overcoming the force of said sealing means to open said valve.
Claim 2
Dependent Claim
180 words
A direct pressure treating device comprising a treating nozzle, a lower chamber communicating with said nozzle, a middle chamber communicating with said lower chamber, an upper chamber communicating with said middle chamber, a feed hopper communicating with said upper chamber through an outlet opening, a first valve between said lower chamber and said middle chamber, a second valve between said middle chamber and said upper chamber, a third valve between said upper chamber and said feed hopper, said third valve being a slidable gate valve having an opening movable into and out of registry with the outlet opening of said feed hopper, said first and second of said valves being a diaphragm operated valve and including a valve seat, a closure member for selectively seating against said seat for closing communication therethrough, a diaphragm, transmitting means connecting said diaphragm to said closure member, a housing, said diaphragm being in said housing, sealing means for urging said closure member against said seat, and pressure means connected to said housing for overcoming the force of said sealing means to open said valve.
Claim 3
Dependent Claim
34 words
A device as set forth in claim 1 wherein said transmitting means includes a stem connected to said diaphragm and movable therewith, and said closure member being a conical skirt mounted on said stem.
Claim 4
Dependent Claim
57 words
A device as set forth in claim 2 wherein the housing for said first valve is mounted in said middle chamber and the housing for said second valve is mounted in said upper chamber, said sealing means for each of said first and second valves being a spring mounted on its stem and urging said skirt upward.
Claim 5
Dependent Claim
50 words
A device as set forth in claim 3 wherein said pressure means includes a single pressure line for opening said skirt, said skirt being mounted on said stem in a floating self-centering manner, and a spacer being mounted on said stem to limit the amount of movement of said diaphragm.
Claim 6
Dependent Claim
41 words
A device as set forth in claim 1 wherein said gate valve includes a slidable plate, an operating member flexibly connected to said plate for controlling the sliding movement thereof, and a piston and cylinder assembly connected to said operating member.
Claim 7
Dependent Claim
42 words
A device as set forth in claim 5 wherein said plate is made of wear resistant polyurethane, a leaf spring reacting against said plate for maintaining said plate in a horizontal plane, and said piston and cylinder assembly including stroke limiting means.
Claim 8
Dependent Claim
98 words
A device as set forth in claim 1 wherein said pressure means also actuates said gate valve, said lower chamber being under constant pressure and said middle chamber being under intermittent pressure, and sequential control means connected to said pressure means for simultaneously opening said first valve and said gate valve, then for closing said first valve and said gate valve, then fOr exhausting said middle chamber to the atmosphere, then for opening said second valve while said first valve and said gate valve remain closed, and then for pressurizing said middle chamber to complete the sequential cycle.
Claim 9
Dependent Claim
39 words
A device as set forth in claim 7 wherein said sequential control means includes a level detection unit in said lower chamber for initiating the sequential cycle in accordance with the level of treating material in said lower chamber.
Claim 10
Dependent Claim
77 words
A device as set forth in claim 8 wherein said level detection unit includes a tilting bin in said lower chamber disposed under the valve seat of said first valve, a discharge opening in said bin, air circulating lines, a moving member disposed for breaking the circulation of said air lines, and resilient means connecting said moving member to said bin for breaking the circulation when said bin is in a predetermined position in said lower chamber.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |