FR2224659A1 - Safety mechanism for telescopic boom crane - Google Patents

Safety mechanism for telescopic boom crane

Info

Publication number
FR2224659A1
FR2224659A1 FR7427034A FR7427034A FR2224659A1 FR 2224659 A1 FR2224659 A1 FR 2224659A1 FR 7427034 A FR7427034 A FR 7427034A FR 7427034 A FR7427034 A FR 7427034A FR 2224659 A1 FR2224659 A1 FR 2224659A1
Authority
FR
France
Prior art keywords
load
stem
telescopic boom
safety mechanism
cylinder
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.)
Granted
Application number
FR7427034A
Other languages
French (fr)
Other versions
FR2224659B1 (en
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.)
Tadano Iron Works Co Ltd
Original Assignee
Tadano Iron Works Co Ltd
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
Priority claimed from JP4924171A external-priority patent/JPS5145139B1/ja
Priority claimed from JP8366471U external-priority patent/JPS4838293U/ja
Application filed by Tadano Iron Works Co Ltd filed Critical Tadano Iron Works Co Ltd
Priority to FR7427034A priority Critical patent/FR2224659A1/en
Publication of FR2224659A1 publication Critical patent/FR2224659A1/en
Application granted granted Critical
Publication of FR2224659B1 publication Critical patent/FR2224659B1/fr
Granted 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
    • B66C23/905—Devices for indicating or limiting lifting moment electrical

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

The hydraulic jack includes cylinder inside which slides a tightly sealed piston linked to a stem extending out of the cylinder. It has a constraint detector to detect all load in the axial direction of the hydraulic jack, corresponding to the load on the stem. A strain-gauge rigidly fixed to the jack will detect all load and emit an electrical signal. As a preferred addition to this claim at least one gauge is lodged between the cylinder's bottom and its supporting axis or on the periphery of the piston's stem
FR7427034A 1971-07-06 1974-08-02 Safety mechanism for telescopic boom crane Granted FR2224659A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7427034A FR2224659A1 (en) 1971-07-06 1974-08-02 Safety mechanism for telescopic boom crane

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4924171A JPS5145139B1 (en) 1971-07-06 1971-07-06
JP8366471U JPS4838293U (en) 1971-09-13 1971-09-13
FR7427034A FR2224659A1 (en) 1971-07-06 1974-08-02 Safety mechanism for telescopic boom crane

Publications (2)

Publication Number Publication Date
FR2224659A1 true FR2224659A1 (en) 1974-10-31
FR2224659B1 FR2224659B1 (en) 1978-09-15

Family

ID=27250345

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7427034A Granted FR2224659A1 (en) 1971-07-06 1974-08-02 Safety mechanism for telescopic boom crane

Country Status (1)

Country Link
FR (1) FR2224659A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401407A1 (en) * 1977-06-16 1979-03-23 Preux Roger Electronic control of crane motor output - uses pressure transducer in hydraulic ram to monitor crane load
WO2002052115A2 (en) * 2000-12-22 2002-07-04 Schwing Gmbh Device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar
WO2020201289A3 (en) * 2019-04-01 2021-01-21 Schwing Gmbh Piston rod unit, hydraulic cylinder and articulated mast

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401407A1 (en) * 1977-06-16 1979-03-23 Preux Roger Electronic control of crane motor output - uses pressure transducer in hydraulic ram to monitor crane load
WO2002052115A2 (en) * 2000-12-22 2002-07-04 Schwing Gmbh Device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar
WO2002052115A3 (en) * 2000-12-22 2002-12-12 Schwing Gmbh F Device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar
US7007590B2 (en) 2000-12-22 2006-03-07 Schwing Gmbh Device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar
WO2020201289A3 (en) * 2019-04-01 2021-01-21 Schwing Gmbh Piston rod unit, hydraulic cylinder and articulated mast

Also Published As

Publication number Publication date
FR2224659B1 (en) 1978-09-15

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