Patent US3653293A successfully refreshed from Google Patents.
US3653293A
Expired / Lapsed
US
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Press unloader
Assignee: Individual
•
Filing: 1970-08-07
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Granted: 1972-04-04
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Expires: 1990-08-07
Abstract
Abstract A press unloader having a reciprocating tray for receiving workpieces ejected from an upper die in a press. The tray is shifted to the work-receiving position at a rate controlled by the upward rate of the press ram and is rapidly retracted at a rate independent of the rate of the press ram so that the next workpiece may be conveniently loaded into the press.
Inventors
- 👤 Bernard J Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:22
CPC Classifications
B; B21; B21D; B21D43/00; B21D43/02; B21D43/16; B21D45/00; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2027; Y10T83/2029; Y10T83/2092; Y10T83/2198
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
168 words
In combination a press having a vertically reciprocating ram on which an upper die is adapted to be mounted for cooperation with a lower die mounted on the bed of the press, a press unloader for receiving workpieces ejected from the upper die when the dies are vertically separated, said unloader comprising a tray shiftable from a work-receiving position disposed between the vertically separated upper and lower dies to a retracted position out of the path of travel of the upper die, means operative with the upward movement of the press ram and movable aT a rate determined by the upward rate and movable at a rate determined by the upward rate of travel of the press ram for shifting said tray from said retracted position to said workreceiving position, means for retracting the tray at a rate of travel greater than said rate of tray travel during shifting to the work-receiving position, and means for actuating the tray retracting means when the ram reaches a predetermined position.
Claim 2
Dependent Claim
168 words
In combination a press having a vertically reciprocating ram on which an upper die is adapted to be mounted for cooperation with a lower die mounted on the bed of the press, a press unloader for receiving workpieces ejected from the upper die when the dies are vertically separated, said unloader comprising a tray shiftable from a work-receiving position disposed between the vertically separated upper and lower dies to a retracted position out of the path of travel of the upper die, means operative with the upward movement of the press ram and movable aT a rate determined by the upward rate and movable at a rate determined by the upward rate of travel of the press ram for shifting said tray from said retracted position to said workreceiving position, means for retracting the tray at a rate of travel greater than said rate of tray travel during shifting to the work-receiving position, and means for actuating the tray retracting means when the ram reaches a predetermined position.
Claim 3
Dependent Claim
44 words
The combination set forth in claim 1 wherein said means for shifting the tray from the retracted position to the work-receiving position is adapted to move the tray at a rate proportional to the rate of travel of the ram on its upward stroke.
Claim 4
Dependent Claim
27 words
The combination set forth in claim 1 wherein said means for shifting the tray from the retracted position to the work-receiving position comprises a vertically reciprocating shaft.
Claim 5
Dependent Claim
22 words
The combination set forth in claim 3 including means for interengaging said shaft and the ram on the upstroke of the ram.
Claim 6
Dependent Claim
23 words
The combination set forth in claim 4 wherein said last-mentioned means includes a fluid cylinder having a piston operatively connected with said shaft.
Claim 7
Dependent Claim
31 words
The combination set forth in claim 5 wherein the piston is adapted to shift said shaft vertically in opposite directions in response to application of fluid pressure to opposite sides thereof.
Claim 8
Dependent Claim
85 words
The combination set forth in claim 6 wherein said means for shifting the tray to the work-receiving position comprises abutment means located between said ram and the upper end portion of said shaft and valve means for directing pressure fluid to one side of the piston for interengaging said abutment means on the upward stroke of the ram for causing said tray to shift from said retracted position to said work-receiving position at a rate controlled by the upward rate of travel of the ram.
Claim 9
Dependent Claim
67 words
The combination set forth in claim 7 wherein said means for retracting said tray includes said cylinder and said means for actuating the tray retracting means includes valve means which when actuated is adapted to apply pressure fluid to the opposite side of the piston for displacing said shaft downwardly at a rate in excess of the rate of travel of the ram on its downward stroke.
Claim 10
Dependent Claim
34 words
The combination set forth in claim 8 including an actuator for said last-mentioned valve means, said actuator being disposed so as to be tripped by the ram when the ram reaches a predetermined position.
Claim 11
Dependent Claim
20 words
The combination set forth in claim 1 wherein said predetermined position is adjacent the upper end of the ram stroke.
Claim 12
Dependent Claim
168 words
In combination a press having a vertically reciprocating ram on which an upper die element is adapted to be mounted for cooperation with a lower die mounted on the bed of the press, a press unloader for receiving workpieces ejected from the upper die when the dies are vertically separated, said unloader comprising a tray shiftable from a work-receiving position disposed between the vertically separated upper and lower dies to a retracted position out of the path of travel of the upper die, means operative with the upward movement of the press ram for shifting the tray from said retracted position to said work-receiving position at a rate of travel determined by the rate of travel of the ram, means biasing the tray toward said retracted position for retracting the tray at a rate of travel greater than the rate at which the tray is shifted to the work-receiving position, and means for rendering said biasing means effective as the ram approaches the upper end of its stroke.
Claim 13
Dependent Claim
168 words
In combination a press having a vertically reciprocating ram on which an upper die element is adapted to be mounted for cooperation with a lower die mounted on the bed of the press, a press unloader for receiving workpieces ejected from the upper die when the dies are vertically separated, said unloader comprising a tray shiftable from a work-receiving position disposed between the vertically separated upper and lower dies to a retracted position out of the path of travel of the upper die, means operative with the upward movement of the press ram for shifting the tray from said retracted position to said work-receiving position at a rate of travel determined by the rate of travel of the ram, means biasing the tray toward said retracted position for retracting the tray at a rate of travel greater than the rate at which the tray is shifted to the work-receiving position, and means for rendering said biasing means effective as the ram approaches the upper end of its stroke.
Claim 14
Dependent Claim
25 words
The combination set forth in claim 11 including means for rendering said biasing means ineffective as the ram approaches the lower end of its stroke.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |