US3589568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable hollow shaft, helix, and drum for feeding solids
Assignee: PPG Industries Inc
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Filing: 1969-04-17
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Granted: 1971-06-29
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Expires: 1989-04-17
Abstract
Abstract A finely divided solids feeder is disclosed comprising a chamber having a shaft running through an airtight chamber to a feed bin located outside of the chamber. The hollow shaft, which is covered except for a port near the exit end of the chamber, has a helix running through it; the helix going completely through the hollow shaft of the chamber and into a feed bin located outside of the chamber. The shaft is provided with a second opening in the feed bin so that material can be discharged into the feed bin. The chamber and feed bin are provided with airtight seals and provision is made in the feed bin to introduce inert gas to thereby prevent any possible chemical reaction of materials being fed. The chamber, helix and hollow shaft rotate in the same direction. Rotation of the hollow shaft and tension on the helix permit metered feed.
Inventors
- 👤 Charles H Hoelscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:58
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687; B; B01; B01F; B01F35/00; B01F35/71; B01F35/717; B01F35/7173; B01F35/71731; B01J; B01J8/00; B01J8/0015; B01J8/002; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
An apparatus for feeding metal powders to a bin comprising a rotating drum, a hollow drive shaft housed in part in said drum and having located within it a helix, an opening provided in the hollow drive shaft positioned in the rotating drum for the introduction of material from the drum into the helix, means for charging material to the drum, means for rotating the hollow shaft, helix and drum simultaneously and in the same direction, a bin located outside of said drum for receiving a portion of the said hollow shaft and helix, means on this said portion of the hollow shaft located in said bin for discharging material contained within the helix into the bin.
Claim 2
Independent Claim
117 words
An apparatus for feeding metal powders to a bin comprising a rotating drum, a hollow drive shaft housed in part in said drum and having located within it a helix, an opening provided in the hollow drive shaft positioned in the rotating drum for the introduction of material from the drum into the helix, means for charging material to the drum, means for rotating the hollow shaft, helix and drum simultaneously and in the same direction, a bin located outside of said drum for receiving a portion of the said hollow shaft and helix, means on this said portion of the hollow shaft located in said bin for discharging material contained within the helix into the bin.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said drum is provided with a vane attached to the drum wall.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein means are provided to apply tension to said helix.
Claim 5
Dependent Claim
15 words
The apparatus of claim 1 wherein said drive shaft is centrally located in same drum.
Claim 6
Independent Claim
127 words
A method of feeding an easily deformable powder to a bin in free-flowing state comprising introducing the powder to a drum, rotating the drum to thereby cause the powder to fall against a hollow shaft member traversing the interior of the drum and rotating in the same direction as the drum, feeding the powder from the drum through an opening in the hollow shaft member to a helix located in the hollow shaft, transporting the powder along the helix to a bin positioned outside of the said drum by free flow along the helix by rotating the helix in the same direction as the hollow shaft and the drum and discharging the powder in said bin through an opening in the hollow shaft located in said bin.
Claim 7
Independent Claim
127 words
A method of feeding an easily deformable powder to a bin in free-flowing state comprising introducing the powder to a drum, rotating the drum to thereby cause the powder to fall against a hollow shaft member traversing the interior of the drum and rotating in the same direction as the drum, feeding the powder from the drum through an opening in the hollow shaft member to a helix located in the hollow shaft, transporting the powder along the helix to a bin positioned outside of the said drum by free flow along the helix by rotating the helix in the same direction as the hollow shaft and the drum and discharging the powder in said bin through an opening in the hollow shaft located in said bin.
Claim 8
Dependent Claim
20 words
The method of claim 5 wherein said bin is blanketed with a gas inert to the powder being fed thereto.
Claim 9
Dependent Claim
27 words
The method of claim 5 wherein the powder is selected from the group consisting of alkali metals, alkaline earth metals, zinc, lead, organic acids and solid polymers.
Claim 10
Dependent Claim
11 words
The method of claim 5 wherein the powder is metallic lithium.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein the inert gas is selected from the group consisting of argon and helium.
References Cited (Backward Citations)
US2738960A
Cited
US3053227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |