Patent US3568886A successfully refreshed from Google Patents.
US3568886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low capacity weigher and feeder
Assignee: Merrick Scale Manufacturing Co
•
Filing: 1969-03-18
•
Granted: 1971-03-09
•
Expires: 1989-03-18
Abstract
Abstract A low capacity weigher and feeder for handling capacities from 100 pounds per hour to a fraction of a pound per hour comprising a bin discharging material into a screw prefeeder or conveyor inclining to and transferring the material into a rotating drum declining from the transfer end of the screw conveyor and supported by a beam fulcrumed at the point of transfer between the screw conveyor and the drum and connected to a low capacity strain gauge for controlling the rate of feed and integrating the weight of said material. Both the screw conveyor and the drum are rotated by separate variable speed motors which are regulated by the strain gauge and a pulser wheel with its pickup coil.
Inventors
- 👤 John L Christmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
G; G01; G01G; G01G11/00; G01G11/04; G01G11/043
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
In a low capacity material weigher and feeder, a screw conveyor having a material inlet and outlet, a beam fulcrumed at the material outlet of the screw conveyor, and a drum rotatably supported by and extended in the horizontal plane of the beam and one end communicating with the material outlet of the screw conveyor.
Claim 2
Dependent Claim
55 words
In a low capacity material weigher and feeder, a screw conveyor having a material inlet and outlet, a beam fulcrumed at the material outlet of the screw conveyor, and a drum rotatably supported by and extended in the horizontal plane of the beam and one end communicating with the material outlet of the screw conveyor.
Claim 3
Dependent Claim
32 words
In a low capacity material, weigher and feeder as claimed in claim 1, two variable motive means, one being connected to the screw conveyor and the other being connected to the drum.
Claim 4
Dependent Claim
47 words
A low capacity material weigher and feeder as claimed in claim 1, wherein the beam is fulcrumed intermediate the ends thereof with the end of the drum communicating with the material outlet of the screw conveyor extended beyond the fulcrum in the direction of the screw conveyor.
Claim 5
Dependent Claim
48 words
A low capacity material weigher and feeder as claimed in claim 1, wherein the beam comprises two parts, the first part rotatably supporting the drum, and the second part extending in the direction of the screw conveyor, both parts being connected together and fulcrumed at the same point.
Claim 6
Dependent Claim
33 words
In a low capacity material weigher and feeder as claimed in claim 4, motive means supported by the first part of the beam and operatively connected to the drum to rotate the same.
Claim 7
Dependent Claim
46 words
In a low capacity material weigher and feeder as claimed in claim 4, counterbalance weights mounted on the first and second parts of the beam to maintain the center of gravity of the beam and the drum a small distance below the fulcrum of the beam.
Claim 8
Dependent Claim
70 words
In a low capacity material weigher and feeder as claimed in claim 4, a strain gauge connected to the second part of the beam, a pulser wheel actuated by the rotation of the drum, an electric coil receiving electric pulses from the pulser wheel, means electrically connected to the strain gauge and the electric coil and arranged to control the speed of rotation of the screw conveyor and the drum.
Claim 9
Dependent Claim
87 words
In a low capacity material weigher and feeder as claimed in claim 2, a strain gauge connected to the beam on one side of the beam fulcrum, a pulser wheel driven by the motive means connected to the drum, an electric coil receiving electric pulses from the pulser wheel, and means electrically connected to the strain gauge, the electric coil and the two motive means and arranged to control the speed of said motive means and the speed of rotation of the screw conveyor and the drum.
Claim 10
Dependent Claim
40 words
In a low capacity material weigher and feeder as claimed in claim 1, vanes rotatably supported in the outlet of the screw conveyor and operatively connected to the screw conveyor to rotate therewith and produce a uniform discharge of material.
Claim 11
Dependent Claim
26 words
A low capacity material weigher and feeder as claimed in claim 1, wherein the screw conveyor and the drum extend in declining planes from each other.
Claim 12
Dependent Claim
37 words
In a low capacity material weigher and feeder as claimed in claim 7 stops adjustably mounted above and below the second part of the beam to limit the beam deflection and protect the strain gauge from damage.
Claim 13
Dependent Claim
34 words
In a low capacity material weigher and feeder as claimed in claim 7, a spring interposed between the strain gauge and the second part of the beam to protect the strain gauge from damage.
Claim 14
Dependent Claim
41 words
In a low capacity material weigher and feeder as claimed in claim 1, a scraper blade fixedly supported by the drum and positioned in the drum to scrape the interior of the drum and prevent material build up in the drum.
Claim 15
Dependent Claim
42 words
A low capacity material weigher and feeder as claimed in claim 1, wherein the drum is rotatably supported by the beam by providing rings secured to and encircling the drum, and wheels rotatably supported by the beam to ride on the rings.
References Cited (Backward Citations)
US491064A
Cited
US1022305A
Cited
US2533852A
Cited
US2900110A
Cited
US2889077A
Cited
US3107819A
Cited
US3253745A
Cited
US3301442A
Cited
US3318438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |