GB1485077A - High response unloading valve and press overload protection system including same - Google Patents
High response unloading valve and press overload protection system including sameInfo
- Publication number
- GB1485077A GB1485077A GB3575275A GB3575275A GB1485077A GB 1485077 A GB1485077 A GB 1485077A GB 3575275 A GB3575275 A GB 3575275A GB 3575275 A GB3575275 A GB 3575275A GB 1485077 A GB1485077 A GB 1485077A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- spool
- pressure
- press
- movement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
- B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
- B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Presses (AREA)
Abstract
1485077 Hydraulic presses GULF & WESTERN MFG CO 29 Aug 1975 [11 Oct 1974 (2)] 35752/75 Heading B5F [Also in Division F2] In a pressure relief valve for an overload protection system of a press, the chambers 148, 182 at opposite ends of a spool valve element 188 are normally at equal pressure but on press overload pressure in chamber 182 rises relative to that in chamber 148 so that the spool moves to the left to connect chamber 148 to a drain port 150 via valve surfaces 162, 154. Thereafter the excess pressure in chamber 182 accelerates the spool movement so that cylindrical portion 174 moves out of bore 158 to connect the chamber 182 to the drain port 150 and relieves the pressure in a piston-cylinder device of the press. The spool has a central square portion with rounded movement-guiding corners between which flows takes place from the chamber 148 to the drain port 150. This flow is throttled by a surface 176 on the spool to damp the movement of the spool towards the end of its movement to the left. The two chambers are supplied with pressure by a pump and are interconnected by a check valve. In a modification two dump valves are arranged in series between the chamber 182 and the piston-cylinder of the press, both valves allowing a restricted flow to the piston-cylinder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/514,107 US3955396A (en) | 1974-10-11 | 1974-10-11 | Press overload protection system |
US05/514,106 US4015620A (en) | 1974-10-11 | 1974-10-11 | High response unloading valve |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1485077A true GB1485077A (en) | 1977-09-08 |
Family
ID=27058096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3575275A Expired GB1485077A (en) | 1974-10-11 | 1975-08-29 | High response unloading valve and press overload protection system including same |
Country Status (8)
Country | Link |
---|---|
AU (1) | AU475805B2 (en) |
BR (1) | BR7506635A (en) |
CA (1) | CA1032850A (en) |
DE (3) | DE7531586U (en) |
ES (1) | ES441700A1 (en) |
FR (1) | FR2287330A1 (en) |
GB (1) | GB1485077A (en) |
IT (1) | IT1047514B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19532962A1 (en) * | 1995-09-07 | 1997-03-13 | Ulrich Keller | Hydraulic overload control valve, esp. on presses |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2800832C2 (en) * | 1978-01-10 | 1986-09-04 | L. Schuler GmbH, 7320 Göppingen | Overload protection device for a press |
FR2460410A1 (en) * | 1979-06-28 | 1981-01-23 | Paul Hydraulique | Hydraulic circuit overpressure protection valve - has relief valve connected to differential piston to detect surges |
DE3305264A1 (en) * | 1983-02-16 | 1984-08-16 | L. Schuler GmbH, 7320 Göppingen | Device for limiting the pressing force on mechanical presses |
DE19615926C1 (en) * | 1996-04-22 | 1997-07-17 | Fraunhofer Ges Forschung | Overload-fuse device for power path of mechanical press |
DE19637804A1 (en) * | 1996-09-17 | 1998-03-19 | Ulrich Keller | Valve unit for hydraulic overload safety in presses |
DE19643104A1 (en) * | 1996-10-21 | 1998-04-23 | Ulrich Keller | Valve mechanism, especially for hydraulic overload protection of presses |
ES2185434B1 (en) * | 1999-06-17 | 2004-06-16 | Fagor, S. Coop. | HYDRAULIC SECURITY CIRCUIT IN A PRESS. |
DE10015785B4 (en) * | 2000-03-30 | 2016-05-25 | Ulrich Keller | Simple, safe and fast valve device, especially for hydraulic overload devices on presses |
CN105697430A (en) * | 2016-01-21 | 2016-06-22 | 杭震 | Hydraulic overload protection device and mechanical press with hydraulic overload protection device |
-
1975
- 1975-08-27 AU AU84314/75A patent/AU475805B2/en not_active Expired
- 1975-08-29 GB GB3575275A patent/GB1485077A/en not_active Expired
- 1975-09-23 IT IT5146975A patent/IT1047514B/en active
- 1975-09-24 CA CA236,262A patent/CA1032850A/en not_active Expired
- 1975-10-04 DE DE19757531586 patent/DE7531586U/en not_active Expired
- 1975-10-04 DE DE19757612882 patent/DE7612882U1/en not_active Expired
- 1975-10-04 DE DE19752544507 patent/DE2544507C3/en not_active Expired
- 1975-10-10 ES ES441700A patent/ES441700A1/en not_active Expired
- 1975-10-10 FR FR7531119A patent/FR2287330A1/en active Granted
- 1975-10-10 BR BR7506635A patent/BR7506635A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19532962A1 (en) * | 1995-09-07 | 1997-03-13 | Ulrich Keller | Hydraulic overload control valve, esp. on presses |
Also Published As
Publication number | Publication date |
---|---|
BR7506635A (en) | 1976-08-17 |
DE2544507B2 (en) | 1979-04-05 |
ES441700A1 (en) | 1977-04-01 |
CA1032850A (en) | 1978-06-13 |
DE2544507A1 (en) | 1976-09-02 |
AU475805B2 (en) | 1976-09-02 |
FR2287330B1 (en) | 1982-03-26 |
AU8431475A (en) | 1976-09-02 |
DE7531586U (en) | 1976-09-30 |
IT1047514B (en) | 1980-10-20 |
FR2287330A1 (en) | 1976-05-07 |
DE7612882U1 (en) | 1976-09-30 |
DE2544507C3 (en) | 1979-11-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920829 |