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US3870168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly for preventing the escape of dust particles during a more or less flowing transfer of powdered material
Assignee: Individual
•
Filing: 1973-03-02
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Granted: 1975-03-11
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Expires: 1993-03-02
Abstract
Abstract An assembly for preventing the escape of dust particles during a more or less flowing transfer of powdered and like material. A receiving means has an opening at its top edge sufficient to permit ready introduction and lowering down into the interior of the receiving means, as well as subsequent removal therefrom, of supply means for the material. A housing for emitting a jet of compressed air and a vacuum housing are arranged opposite each other and adjacent the top edge of the receiving means whereby an air jet carpet can be formed between said housings serving as a blocking layer to minimize the risk of the escape of clouds of dust particles during unloading of the powdered material.
Inventors
- 👤 Per Tybring Aralt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:05
CPC Classifications
F; F17; F17D; F17D3/00; F17D3/14; F17D3/145; B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; B65; B65G; B65G69/00; B65G69/18; B65G69/185; B65G69/186; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
An assembly for preventing the escape of dust particles from a hopper having upstanding walls during transfer thereto of powdered material and the like from a powdered material supply means, said assembly comprising baffles located interiorily of said hopper adjacent the top thereof and defining an access opening in said hopper to permit entry thereto of said powdered material supply means, said baffles extending downwardly and inwardly of said hopper to deflect any movement of dust particles away from said access opening, first and second opposedly directed housing components disposed at the top of said hopper at a location above said baffles, a source of compressed air, conduit means for communicating compressed air from said source to the first of said housing components, said first housing component including means for directing a curtain flow of compressed air therefrom across said hopper access opening in the direction of said second housing component, said second housing component being open to permit entry of compressed air thereto, a duct encircling an upper portion of said hopper, means for maintaining a condition of vacuum in said duct, and means for establishing communication between said duct and both the interior of said hopper and said second housing component.
Claim 2
Dependent Claim
203 words
An assembly for preventing the escape of dust particles from a hopper having upstanding walls during transfer thereto of powdered material and the like from a powdered material supply means, said assembly comprising baffles located interiorily of said hopper adjacent the top thereof and defining an access opening in said hopper to permit entry thereto of said powdered material supply means, said baffles extending downwardly and inwardly of said hopper to deflect any movement of dust particles away from said access opening, first and second opposedly directed housing components disposed at the top of said hopper at a location above said baffles, a source of compressed air, conduit means for communicating compressed air from said source to the first of said housing components, said first housing component including means for directing a curtain flow of compressed air therefrom across said hopper access opening in the direction of said second housing component, said second housing component being open to permit entry of compressed air thereto, a duct encircling an upper portion of said hopper, means for maintaining a condition of vacuum in said duct, and means for establishing communication between said duct and both the interior of said hopper and said second housing component.
Claim 3
Dependent Claim
203 words
An assembly for preventing the escape of dust particles from a hopper having upstanding walls during transfer thereto of powdered material and the like from a powdered material supply means, said assembly comprising baffles located interiorily of said hopper adjacent the top thereof and defining an access opening in said hopper to permit entry thereto of said powdered material supply means, said baffles extending downwardly and inwardly of said hopper to deflect any movement of dust particles away from said access opening, first and second opposedly directed housing components disposed at the top of said hopper at a location above said baffles, a source of compressed air, conduit means for communicating compressed air from said source to the first of said housing components, said first housing component including means for directing a curtain flow of compressed air therefrom across said hopper access opening in the direction of said second housing component, said second housing component being open to permit entry of compressed air thereto, a duct encircling an upper portion of said hopper, means for maintaining a condition of vacuum in said duct, and means for establishing communication between said duct and both the interior of said hopper and said second housing component.
Claim 4
Dependent Claim
203 words
An assembly for preventing the escape of dust particles from a hopper having upstanding walls during transfer thereto of powdered material and the like from a powdered material supply means, said assembly comprising baffles located interiorily of said hopper adjacent the top thereof and defining an access opening in said hopper to permit entry thereto of said powdered material supply means, said baffles extending downwardly and inwardly of said hopper to deflect any movement of dust particles away from said access opening, first and second opposedly directed housing components disposed at the top of said hopper at a location above said baffles, a source of compressed air, conduit means for communicating compressed air from said source to the first of said housing components, said first housing component including means for directing a curtain flow of compressed air therefrom across said hopper access opening in the direction of said second housing component, said second housing component being open to permit entry of compressed air thereto, a duct encircling an upper portion of said hopper, means for maintaining a condition of vacuum in said duct, and means for establishing communication between said duct and both the interior of said hopper and said second housing component.
Claim 5
Dependent Claim
38 words
The assembly according to claim 1, wherein the first housing component and the second housing component have substantially horizontal guard members extending outwardly therefrom into the access opening adjacent the top of the hopper and above the baffles.
Claim 6
Dependent Claim
118 words
The assembly according to claim 1, wherein the baffle members are formed with a branch portion which initially is curved and then extends obliquely downwards and outwardly of said hopper into said duct as a guide plate defining with the walls of the upper portion of the hopper openings communicating said hopper to said duct and wherein the second housing component is connected to the duct by a conduit designed with a control flap, regulation of said flap governing the flow of air from the first housing component to the second housing component and in association with the baffles directing portions of the air curtain flow to be forced downwards into the hopper and thence into the duct.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |