Patent US3668919A successfully refreshed from Google Patents.
US3668919A
Expired / Lapsed
US
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Combination hydraulic shearing and pressbrake machine
Assignee: Individual
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Filing: 1970-09-11
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Granted: 1972-06-13
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Expires: 1990-09-11
Abstract
Abstract A combination hydraulic shearing and pressbrake machine is disclosed which includes auxiliary hydraulic cylinders in addition to main cylinders to actuate the ram. The auxiliary cylinders are held at rest during the shearing mode of operation but actuated together with the main cylinders during the pressbrake operation, in which the auxiliary cylinders serve particularly to support and maintain maximum parallelism of the ram. A control device is also disclosed which switches the operation of the auxiliary cylinders relative to the main cylinders and which further regulates the upper and lower limit positions of the reciprocating ram.
Inventors
- 👤 Toshio Hongo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:05
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/02; B21D5/029; B23; B23D; B23D15/00; B23D15/12; B23D15/14; B30; B30B; B30B15/00; B30B15/007; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8858; Y10T83/8864
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A combination hydraulic shearing and pressbrake machine which comprises a reciprocating ram, a set of main hydraulic cylinders actuating said ram and a plurality of auxiliary hydraulic cylinders each having a piston rod disposed normally in spaced apart relation to said ram during the shearing mode of operation, said auxiliary hydraulic cylinders being arranged to operate in the pressbrake mode of operation together with said main cylinders to actuate the ram.
Claim 2
Dependent Claim
71 words
A combination hydraulic shearing and pressbrake machine which comprises a reciprocating ram, a set of main hydraulic cylinders actuating said ram and a plurality of auxiliary hydraulic cylinders each having a piston rod disposed normally in spaced apart relation to said ram during the shearing mode of operation, said auxiliary hydraulic cylinders being arranged to operate in the pressbrake mode of operation together with said main cylinders to actuate the ram.
Claim 3
Dependent Claim
197 words
In a combination hydraulic shearing and pressbrake machine of the class described including main cylinders and auxiliary cylinders, an oil path switching device which comprises a main and change-over valve control unit and a ram stroke regulating unit, said valve control unit including a frame, a cam shaft slidably journalled in bearings secured to said frame, a bell crank having one end secured to said cam shaft, a main valve supplying an oil pressure to the main cylinders, a plunger connecting between the other end of said bell crank and said main valve, cam means mounted on said cam shaft, a rotary lever pivotted on said frame and disposed to engage said cam means, a pedal resiliently held in position and connected to said rotary lever, a shifting leVer connected to said cam shaft, a change-over valve supplying an oil pressure to the auxiliary cylinders, and a plunger connecting between said shifting lever and said change-over valve, and said ram stroke regulating unit including a screw rod parallel with said cam shaft and rotatably mounted in said frame and means operatively associated with said screw rod for setting the upper and lower limit positions of the ram.
Claim 4
Dependent Claim
197 words
In a combination hydraulic shearing and pressbrake machine of the class described including main cylinders and auxiliary cylinders, an oil path switching device which comprises a main and change-over valve control unit and a ram stroke regulating unit, said valve control unit including a frame, a cam shaft slidably journalled in bearings secured to said frame, a bell crank having one end secured to said cam shaft, a main valve supplying an oil pressure to the main cylinders, a plunger connecting between the other end of said bell crank and said main valve, cam means mounted on said cam shaft, a rotary lever pivotted on said frame and disposed to engage said cam means, a pedal resiliently held in position and connected to said rotary lever, a shifting leVer connected to said cam shaft, a change-over valve supplying an oil pressure to the auxiliary cylinders, and a plunger connecting between said shifting lever and said change-over valve, and said ram stroke regulating unit including a screw rod parallel with said cam shaft and rotatably mounted in said frame and means operatively associated with said screw rod for setting the upper and lower limit positions of the ram.
Claim 5
Dependent Claim
20 words
The machine as defined in claim 2 wherein said cam means is provided with grooves for receiving said rotary lever.
Claim 6
Dependent Claim
17 words
The machine as defined in claim 2 wherein said cam means is contacted by cam follower means.
Claim 7
Dependent Claim
33 words
The machine as defined in claim 2 wherein said ram stroke regulating unit further includes dog members movable along said screw rod to select the upper and lower limit positions of the ram.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |