US3552253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bar shear apparatus
Assignee: Amforge Inc
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Filing: 1968-08-26
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Granted: 1971-01-05
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Expires: 1988-08-26
Abstract
Abstract Apparatus for shearing steel bar stock and the like including improved means for removably mounting a cutter block member to a power ram and means for controlling the stroke of the ram through use of an electrical timing device.
Inventors
- 👤 Thomas J Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:14
CPC Classifications
B; B23; B23D; B23D36/00; B23D36/0008; B23D36/0033; B23D36/0058; B23D15/00; B23D15/12; B23D15/14; B23D21/00; B23D25/00; B23D25/02; B23D25/04; Y; Y10; Y10T; Y10T83/00; Y10T83/404; Y10T83/412; Y10T83/525; Y10T83/541; Y10T83/544; Y10T83/869; Y10T83/8691; Y10T83/8696; Y10T83/8821; Y10T83/8858
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
213 words
In bar apparatus for shearing metal bar stock and the like, said apparatus including a hydraulically actuated piston-cylinder assembly for driving a power ram member through a predetermined shearing stroke, the improvement comprising, in combination, pump means for supplying oil under pressure to said cylinder for moving said power ram in a predetermined direction, said oil being supplied to a first end of said cylinder to move said power ram through a shearing stroke and being supplied to a second end of said cylinder to return said power ram to its idling position, valve means between said pump means and said cylinder for directing said oil to a selected one of said cylinder ends, timing means, means for initiating operation of said timing means at the beginning of a shearing stroke, and valve control means responsive to said timing means for controlling said valve means, said valve means being moved to a first position to initiate movement of said power ram through a shearing stroke and said timing means being operative after a preselected time to actuate said valve control means and cause movement of said valve means to a second position thereby effecting a reversal of the movement of said power ram after movement of the latter through a predetermined shearing stroke.
Claim 2
Dependent Claim
213 words
In bar apparatus for shearing metal bar stock and the like, said apparatus including a hydraulically actuated piston-cylinder assembly for driving a power ram member through a predetermined shearing stroke, the improvement comprising, in combination, pump means for supplying oil under pressure to said cylinder for moving said power ram in a predetermined direction, said oil being supplied to a first end of said cylinder to move said power ram through a shearing stroke and being supplied to a second end of said cylinder to return said power ram to its idling position, valve means between said pump means and said cylinder for directing said oil to a selected one of said cylinder ends, timing means, means for initiating operation of said timing means at the beginning of a shearing stroke, and valve control means responsive to said timing means for controlling said valve means, said valve means being moved to a first position to initiate movement of said power ram through a shearing stroke and said timing means being operative after a preselected time to actuate said valve control means and cause movement of said valve means to a second position thereby effecting a reversal of the movement of said power ram after movement of the latter through a predetermined shearing stroke.
Claim 3
Dependent Claim
47 words
The invention of claim 1 where said valve control means includes solenoid means, said solenoid means being energized upon the beginning of a shearing stroke, and said timing means serving to effect deenergization of said solenoid means a preselected time after the beginning of said shearing stroke.
Claim 4
Dependent Claim
30 words
The invention of claim 1 where said timing means includes a potentiometer for setting said preselected time, the setting of said potentiometer thereby determining the length of said shearing stroke.
Claim 5
Dependent Claim
29 words
The invention of claim 2 including an electrical start switch, said start switch serving to effect energization of said solenoid while simultaneously initiating the operation of said timing means.
Claim 6
Dependent Claim
45 words
The invention of claim 1 where said valve means comprises a two-position hydraulically controlled valve, and said valve control means including second valve means for directing a portion of said oil to a selected side of said hydraulically controlled valve to control the position thereof.
Claim 7
Dependent Claim
65 words
The invention of claim 5 where said valve control means further includes solenoid means, said solenoid means being energized upon the beginning of a shearing stroke, and said timing means serving to effect deenergization of said solenoid means a preselected time after the beginning of said shearing stroke, said solenoid means being connected with said second valve means for controlling the position of the latter.
Claim 8
Dependent Claim
288 words
In bar shear apparatus for shearing metal bar stock and the like, said apparatus including a hydraulically actuated piston-cylinder assembly for driving a power ram member through a predetermined shearing stroke, the improvement comprising, in combination, pump means for supplying oil under pressure to said cylinder for moving said power ram in a predetermined direction, said oil being supplied to a first end of said cylinder to move said power ram through a shearing stroke and being supplied to a second end of said cylinder to return said power ram to its idling position, first valve means comprising a two-position hydraulically controlled valve between said pump means and said cylinder for directing said oil to a selected one of said cylinder ends, second valve means for directing a portion of said oil to a selected side of said first valve means to control the posItion thereof, solenoid means connected to said second valve means to control the position of the latter, timing means, an electrical start switch for effecting energization of said solenoid means while simultaneously initiating the operation of said timing means, said solenoid means thus being energized upon the beginning of a shearing stroke and said timing means serving to effect deenergization of said solenoid means a preselected time after the beginning of said shearing stroke, said first valve means thus being moved to a first position to initiate movement of said power ram through a shearing stroke and said timing means being operative after a preselected time to deenergize said solenoid means and effect movement of said first valve means to a second position thereby causing a reversal of the movement of said power ram after movement of the latter through a predetermined shearing stroke.
Claim 9
Dependent Claim
288 words
In bar shear apparatus for shearing metal bar stock and the like, said apparatus including a hydraulically actuated piston-cylinder assembly for driving a power ram member through a predetermined shearing stroke, the improvement comprising, in combination, pump means for supplying oil under pressure to said cylinder for moving said power ram in a predetermined direction, said oil being supplied to a first end of said cylinder to move said power ram through a shearing stroke and being supplied to a second end of said cylinder to return said power ram to its idling position, first valve means comprising a two-position hydraulically controlled valve between said pump means and said cylinder for directing said oil to a selected one of said cylinder ends, second valve means for directing a portion of said oil to a selected side of said first valve means to control the posItion thereof, solenoid means connected to said second valve means to control the position of the latter, timing means, an electrical start switch for effecting energization of said solenoid means while simultaneously initiating the operation of said timing means, said solenoid means thus being energized upon the beginning of a shearing stroke and said timing means serving to effect deenergization of said solenoid means a preselected time after the beginning of said shearing stroke, said first valve means thus being moved to a first position to initiate movement of said power ram through a shearing stroke and said timing means being operative after a preselected time to deenergize said solenoid means and effect movement of said first valve means to a second position thereby causing a reversal of the movement of said power ram after movement of the latter through a predetermined shearing stroke.
References Cited (Backward Citations)
US2788070A
Cited
US3170376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |