FR2261216A1 - Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls - Google Patents

Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls

Info

Publication number
FR2261216A1
FR2261216A1 FR7405457A FR7405457A FR2261216A1 FR 2261216 A1 FR2261216 A1 FR 2261216A1 FR 7405457 A FR7405457 A FR 7405457A FR 7405457 A FR7405457 A FR 7405457A FR 2261216 A1 FR2261216 A1 FR 2261216A1
Authority
FR
France
Prior art keywords
servo
pressure
derricking
controls
overload protection
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Withdrawn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
FR7405457A
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.)
TICO AB
Original Assignee
TICO AB
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 TICO AB filed Critical TICO AB
Priority to FR7405457A priority Critical patent/FR2261216A1/en
Publication of FR2261216A1 publication Critical patent/FR2261216A1/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Withdrawn legal-status Critical Current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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
  • Jib Cranes (AREA)

Abstract

The system is for use with hydraulic cranes having a first actuator, typically a jib derricking ram, and others hydraulically actuated to vary the load on the first one. Fluid pressure in the first actuator is ascertained by a primary detector which opens or shuts at a predetermined pressure, a pressure-reducing connection between an unpressurised union and the servo controls of the other actuators referred to. The pressure-reduction connection can be between the servo fluid reservoir and a pre-control valve connected to the control distributor for the other actuator. Where there are several such, all their pre-control valves can be connected to the primary detector, in each case via a non-return valve.
FR7405457A 1974-02-14 1974-02-14 Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls Withdrawn FR2261216A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7405457A FR2261216A1 (en) 1974-02-14 1974-02-14 Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7405457A FR2261216A1 (en) 1974-02-14 1974-02-14 Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls

Publications (1)

Publication Number Publication Date
FR2261216A1 true FR2261216A1 (en) 1975-09-12

Family

ID=9135066

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7405457A Withdrawn FR2261216A1 (en) 1974-02-14 1974-02-14 Servo-controlled crane overload protection - has derricking ram pressure detector releasing pressure from servo-controls

Country Status (1)

Country Link
FR (1) FR2261216A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100973A (en) * 1976-04-05 1978-07-18 Altec Industries, Inc. Side load protection arrangement for rotating equipment
EP0003939A2 (en) * 1978-03-01 1979-09-05 Michel Gutierrez Improvements in hydraulically operated lifting devices
FR2600316A1 (en) * 1986-06-19 1987-12-24 Fiskars Ab Oy CONTROL DEVICE FOR THE ARROW OF A HYDRAULIC CRANE

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100973A (en) * 1976-04-05 1978-07-18 Altec Industries, Inc. Side load protection arrangement for rotating equipment
EP0003939A2 (en) * 1978-03-01 1979-09-05 Michel Gutierrez Improvements in hydraulically operated lifting devices
FR2418766A1 (en) * 1978-03-01 1979-09-28 Michel Gutierrez IMPROVEMENT IN HYDRAULIC CONTROLLED LIFTING DEVICES
EP0003939A3 (en) * 1978-03-01 1980-04-16 Michel Gutierrez Improvements in hydraulically operated lifting devices
FR2600316A1 (en) * 1986-06-19 1987-12-24 Fiskars Ab Oy CONTROL DEVICE FOR THE ARROW OF A HYDRAULIC CRANE

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Legal Events

Date Code Title Description
ST Notification of lapse