Patent US3693391A successfully refreshed from Google Patents.
US3693391A
Expired / Lapsed
US
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Steel plate bending apparatus
Assignee: Individual
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Filing: 1971-06-03
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Granted: 1972-09-26
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Expires: 1991-06-03
Abstract
Abstract A steel plate bending apparatus so constructed that, when an end bending of the steel plate is required, the steel plate is inserted between an upper roll and a pair of lower rolls, the top roll being predeterminedly positioned in a movable manner with respect to the bottom rolls, so that the end bending of the steel plate may be effected in a single operation without reinserting again the steel plate.
Inventors
- 👤 Masunori Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:25
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A steel plate bending apparatus comprising: a pair of lower rolls positioned horizontally and parallel to each other; a base stand supporting said pair of lower rolls; an upper roll capable of free vertical displacement; a pair of terminal supporting stands for said upper roll incorporated on said base stand for displacement of said upper roll above the said lower rolls and in direction parallel with the said lower rolls; means on said base stand to rotate said lower rolls; means for displacing said terminal supporting stands in forward and rearward directions; and hydraulically driven means located on supporting stands to move said upper roll in upward and downward directions.
Claim 2
Dependent Claim
110 words
A steel plate bending apparatus comprising: a pair of lower rolls positioned horizontally and parallel to each other; a base stand supporting said pair of lower rolls; an upper roll capable of free vertical displacement; a pair of terminal supporting stands for said upper roll incorporated on said base stand for displacement of said upper roll above the said lower rolls and in direction parallel with the said lower rolls; means on said base stand to rotate said lower rolls; means for displacing said terminal supporting stands in forward and rearward directions; and hydraulically driven means located on supporting stands to move said upper roll in upward and downward directions.
Claim 3
Dependent Claim
65 words
A steel plate bending apparatus as claimed in claim 1, wherein said supporting stands are provided with cylinders having pistons therein, and wherein said upper roll is provided with bearings connected to said pistons, further including a pair of indicating lines in fluid communication with said cylinders to accurately adjust the bending operation of said steel plate by detecting the parallelism of said upper roll.
Claim 4
Dependent Claim
90 words
A steel plate bending apparatus as claimed in claim 1, in which said means for displacing said terminal supporting stands in forward and rearward directions is a motion transmitting mechanism which comprises: a pair of feed screws having worm wheels and being located at one extreme end of the said supporting stands; female threaded portions formed in said supporting stands for engagement with said feed screws; an electrically-driven, bracket-supported shaft; and worms fixed to both ends of said shaft and in engagement with said worm wheels of said feed screws.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |