Patent US3822809A successfully refreshed from Google Patents.
US3822809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loose product metering apparatus
Assignee: Individual
•
Filing: 1973-02-08
•
Granted: 1974-07-09
•
Expires: 1993-02-08
Abstract
Abstract Apparatus for metering loose products such as powder or granules, comprises co-axial metering and compensating worms rotatable in a casing from which the metering worm delivers product into a delivery tube. The worms are independently driven and servo-control means dependent on the torque of the metering worm controls the rate of rotation of the compensating worm which feeds product to the metering worm. By this means the amount of product distributed by the metering screw is strictly proportioned to the speed of rotation of the metering screw.
Inventors
- 👤 J Pellerin
- 👤 P Foucault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:35
CPC Classifications
B; B65; B65G; B65G33/00; B65G33/24; B65B; B65B1/00; B65B1/04; B65B1/10; B65B1/12; B65B37/00; B65B37/08; B65B37/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
Apparatus for effecting continuous metered distribution of a dry loose pulverulent product, such as granules, powders, and the like, said apparatus comprising a metering screw and a compensator screw each supported for independent rotation in a casing having a product outlet for receiving product fed thereto by said metering screw, separate drive means for said compensating and metering screws, a supply from which product is received by said compensator screw for movement thereby to said metering screw, and control means coupled to said compensating screw drive means for rotating said compensator screw in dependence on the rate of delivery of product by the metering screw, said compensator and metering screws having axes of rotation in alignment and in continuation of one another, said casing including a conditioning chamber between the ends of said casing and said compensator and metering screws have free ends facing each other inside said casing substantially vertically in the vicinity of the inlet end of said conditioning chamber.
Claim 2
Dependent Claim
162 words
Apparatus for effecting continuous metered distribution of a dry loose pulverulent product, such as granules, powders, and the like, said apparatus comprising a metering screw and a compensator screw each supported for independent rotation in a casing having a product outlet for receiving product fed thereto by said metering screw, separate drive means for said compensating and metering screws, a supply from which product is received by said compensator screw for movement thereby to said metering screw, and control means coupled to said compensating screw drive means for rotating said compensator screw in dependence on the rate of delivery of product by the metering screw, said compensator and metering screws having axes of rotation in alignment and in continuation of one another, said casing including a conditioning chamber between the ends of said casing and said compensator and metering screws have free ends facing each other inside said casing substantially vertically in the vicinity of the inlet end of said conditioning chamber.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, wherein the casing is constituted by a sleeve which at its ends carries drive means for the respective screws.
Claim 4
Dependent Claim
44 words
Apparatus according to claim 1, wherein said drive means for said compensator screw includes a motor having a constant drive torque, and said drive means for said metering screw includes a motor having a variable speed dependent on the required rate of product delivery.
Claim 5
Independent Claim
117 words
An apparatus for continuous metered distribution of a pulverulent product, comprising a casing accommodating a compensator screw and a metering screw, said metering screw being coaxial with and downstream from said compensator screw, said screws having facing adjacent ends, said casing having an inlet along said compensator screw and an outlet along said metering screw, constant torque drive means for said compensator screw compensating for variations in amounts of product supplied to the compensator screw to insure that said end of the metering screw adjacent said compensator screw is constantly filled, and adjustable speed drive means for said metering screw, the rotational speed of the metering screw determining the amounts of the product delivered at the output.
Claim 6
Independent Claim
117 words
An apparatus for continuous metered distribution of a pulverulent product, comprising a casing accommodating a compensator screw and a metering screw, said metering screw being coaxial with and downstream from said compensator screw, said screws having facing adjacent ends, said casing having an inlet along said compensator screw and an outlet along said metering screw, constant torque drive means for said compensator screw compensating for variations in amounts of product supplied to the compensator screw to insure that said end of the metering screw adjacent said compensator screw is constantly filled, and adjustable speed drive means for said metering screw, the rotational speed of the metering screw determining the amounts of the product delivered at the output.
Claim 7
Dependent Claim
43 words
An apparatus according to claim 4, wherein said casing forms a conditioning chamber at said end of said metering screw, said end of said compensator screw adjacent said end of said metering screw being located at an upstream end of the conditioning chamber.
Claim 8
Dependent Claim
44 words
An apparatus according to claim 5, wherein said ends of said metering and compensator screws are free ends, and wherein said constant torque drive means and said adjustable speed drive means are arranged at other ends of their respective screws remote from each other.
Claim 9
Dependent Claim
24 words
An apparatus according to claim 5, wherein said ends of the compensator and metering screw are substantially perpendicular to the axis of the casing.
Claim 10
Dependent Claim
19 words
An apparatus according to claim 4, further comprising a hopper supplying unmetered quantities of the product at said inlet.
Claim 11
Dependent Claim
32 words
An apparatus according to claim 4, wherein the speed of said constant torque drive means is variable for compensating for changes in the amount of the product conveyed by said compensator screw.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |