US3749257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unloading machine
Assignee: Yamashita Iron Works Ltd
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Filing: 1971-07-08
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Granted: 1973-07-31
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Expires: 1991-07-08
Abstract
Abstract This machine unloads articles piled up in layers on a pallet successively from the uppermost layer. The machine includes a movable conveyor adapted for horizontal reciprocal movement between a predetermined front position and a rear position to send out the articles rearward and an elevator for supporting articles on the pallet in the path of movement of the conveyor. The movable conveyor is provided, at its front end with a lower endless belt for scooping up the articles in frictional contact therewith and an upper endless belt disposed above the lower endless belt for preventing the articles from tumbling during scooping-up operation. These belts are driven in the direction to send out the articles rearward by a motor fixedly mounted on part of a support structure by way of chain-sprocket transmission mechanism. The upper and lower endless belts are adapted to be driven at a higher velocity when the movable conveyor is moved forward than when it is retracted.
Inventors
- 👤 U Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:08
CPC Classifications
B; B65; B65G; B65G59/00; B65G59/02; B65G59/023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
An unloading machine comprising a movable conveyor supported on a support structure and including a number of rollers adapted to be moved reciprocally between a front position and a rear position, article scooping means mounted at the front end of said conveyor, drive means for moving said conveyor toward and away from articles together with said scooping means and means for preventing said articles from moving away from said scooping means, said article scooping means being provided with a rotary body for lifting said articles in frictional contact therewith and means disposed above said rotary body for preventing said articles from tumbling, each of said rotary body for lifting said articles and said means for preventing said articles from tumbling comprising at least one endless belt, both of said belts being adapted to be driven in such directions as to send said articles toward the rear of said movable conveyor.
Claim 2
Dependent Claim
150 words
An unloading machine comprising a movable conveyor supported on a support structure and including a number of rollers adapted to be moved reciprocally between a front position and a rear position, article scooping means mounted at the front end of said conveyor, drive means for moving said conveyor toward and away from articles together with said scooping means and means for preventing said articles from moving away from said scooping means, said article scooping means being provided with a rotary body for lifting said articles in frictional contact therewith and means disposed above said rotary body for preventing said articles from tumbling, each of said rotary body for lifting said articles and said means for preventing said articles from tumbling comprising at least one endless belt, both of said belts being adapted to be driven in such directions as to send said articles toward the rear of said movable conveyor.
Claim 3
Dependent Claim
220 words
An article unloading machine comprising a support structure, a movable conveyor including a number of rollers reciprocally movable in horizontal direction on said support structure, means for supporting articles in the path of movement of said conveyor, a plurality of lower endless belts disposed side by side along the width of front end of said movable conveyor, at least one upper endless belt disposed above said lower endless belts in facing relationship therewith and spaced apart therefrom by a distance for passing said articles, conveyor drive means for reciprocating said movable conveyor along said path and bringing said lower endless belts into contact with said articles, a motor fixedly mounted on said support structure at its side portion, endless chains to be driven by said motor and trained over a distance longer than the length of path of said movable conveyor, means for driving said upper and lower endless belts and rollers of said movable conveyor in such directions as to scoop up said articles and send out the same backward when said chains are driven, and means for preventing said articles from moving away from said lower endless belts, said upper and lower endless belts and said rollers being adapted to be driven at a lower velocity when said movable conveyor is moved backward than when it is advanced.
Claim 4
Dependent Claim
220 words
An article unloading machine comprising a support structure, a movable conveyor including a number of rollers reciprocally movable in horizontal direction on said support structure, means for supporting articles in the path of movement of said conveyor, a plurality of lower endless belts disposed side by side along the width of front end of said movable conveyor, at least one upper endless belt disposed above said lower endless belts in facing relationship therewith and spaced apart therefrom by a distance for passing said articles, conveyor drive means for reciprocating said movable conveyor along said path and bringing said lower endless belts into contact with said articles, a motor fixedly mounted on said support structure at its side portion, endless chains to be driven by said motor and trained over a distance longer than the length of path of said movable conveyor, means for driving said upper and lower endless belts and rollers of said movable conveyor in such directions as to scoop up said articles and send out the same backward when said chains are driven, and means for preventing said articles from moving away from said lower endless belts, said upper and lower endless belts and said rollers being adapted to be driven at a lower velocity when said movable conveyor is moved backward than when it is advanced.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |