FR2419899A1 - Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers - Google Patents

Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers

Info

Publication number
FR2419899A1
FR2419899A1 FR7807748A FR7807748A FR2419899A1 FR 2419899 A1 FR2419899 A1 FR 2419899A1 FR 7807748 A FR7807748 A FR 7807748A FR 7807748 A FR7807748 A FR 7807748A FR 2419899 A1 FR2419899 A1 FR 2419899A1
Authority
FR
France
Prior art keywords
crane
solenoid
operated valve
end stop
control levers
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.)
Withdrawn
Application number
FR7807748A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7807748A priority Critical patent/FR2419899A1/en
Publication of FR2419899A1 publication Critical patent/FR2419899A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment

Abstract

The control mechanism has a hydraulic valve (35) which supplies fluid to an operating jack or motor for hoisting, slewing or derricking the crane. The valve is operated by a lever (47) through the spring loaded connecting rod (52). The connecting rod is attached to a cylinder (51) and the lever to the piston rod (54). If the mechanism is overloaded, the solenoid valve (63) opens and allows the cylinder (51) to move and close the hydraulic valve (35) without moving the lever.
FR7807748A 1978-03-17 1978-03-17 Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers Withdrawn FR2419899A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7807748A FR2419899A1 (en) 1978-03-17 1978-03-17 Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7807748A FR2419899A1 (en) 1978-03-17 1978-03-17 Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers

Publications (1)

Publication Number Publication Date
FR2419899A1 true FR2419899A1 (en) 1979-10-12

Family

ID=9205930

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7807748A Withdrawn FR2419899A1 (en) 1978-03-17 1978-03-17 Automatic overload or end stop for crane - has solenoid-operated valve to release fluid without moving control levers

Country Status (1)

Country Link
FR (1) FR2419899A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478607A1 (en) * 1980-03-21 1981-09-25 Manjot Roger Safety system for hydraulic lifting appts. - uses dual-threshold hydraulic pressure detection systems controlling movements of lifting arms
EP0037348A2 (en) * 1980-03-21 1981-10-07 Roger Manjot Safety device for hydraulically operated lifting device
FR2534643A1 (en) * 1982-10-15 1984-04-20 Bennes Marrel Hydraulic circuit loading monitor for mobile crane

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149150B (en) * 1959-10-28 1963-05-22 Demag Zug Gmbh Mobile crane with an overload protection device
DE1276307B (en) * 1966-10-01 1968-08-29 Miag Muehlenbau & Ind Gmbh Device for automatic limitation of the load torque on jib cranes with hydraulic drive
DE1289277B (en) * 1964-11-25 1969-02-13 Miag Muehlenbau & Ind Gmbh Device for securing against exceeding the permissible load torque for cranes with jibs
US3645407A (en) * 1970-06-15 1972-02-29 Daniel F Przybylski Overload protector for crane booms
US3792780A (en) * 1971-12-02 1974-02-19 Kidde & Co Walter Mechanism for positioning and restricting crane control levers to prevent dangerous load condition
DE2344168A1 (en) * 1973-09-01 1975-03-06 Krueger & Co Securing unit for crane's operating linkage - is actuated when predetermined maximum load moment is exceeded

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149150B (en) * 1959-10-28 1963-05-22 Demag Zug Gmbh Mobile crane with an overload protection device
DE1289277B (en) * 1964-11-25 1969-02-13 Miag Muehlenbau & Ind Gmbh Device for securing against exceeding the permissible load torque for cranes with jibs
DE1276307B (en) * 1966-10-01 1968-08-29 Miag Muehlenbau & Ind Gmbh Device for automatic limitation of the load torque on jib cranes with hydraulic drive
US3645407A (en) * 1970-06-15 1972-02-29 Daniel F Przybylski Overload protector for crane booms
US3792780A (en) * 1971-12-02 1974-02-19 Kidde & Co Walter Mechanism for positioning and restricting crane control levers to prevent dangerous load condition
DE2344168A1 (en) * 1973-09-01 1975-03-06 Krueger & Co Securing unit for crane's operating linkage - is actuated when predetermined maximum load moment is exceeded

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478607A1 (en) * 1980-03-21 1981-09-25 Manjot Roger Safety system for hydraulic lifting appts. - uses dual-threshold hydraulic pressure detection systems controlling movements of lifting arms
EP0037348A2 (en) * 1980-03-21 1981-10-07 Roger Manjot Safety device for hydraulically operated lifting device
EP0037348A3 (en) * 1980-03-21 1982-08-11 Roger Manjot Safety device for hydraulically operated lifting device
FR2534643A1 (en) * 1982-10-15 1984-04-20 Bennes Marrel Hydraulic circuit loading monitor for mobile crane

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Legal Events

Date Code Title Description
ST Notification of lapse