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EP0158740A3 - Hydraulic overload protection device for a lifting apparatus - Google Patents

Hydraulic overload protection device for a lifting apparatus Download PDF

Info

Publication number
EP0158740A3
EP0158740A3 EP84116265A EP84116265A EP0158740A3 EP 0158740 A3 EP0158740 A3 EP 0158740A3 EP 84116265 A EP84116265 A EP 84116265A EP 84116265 A EP84116265 A EP 84116265A EP 0158740 A3 EP0158740 A3 EP 0158740A3
Authority
EP
European Patent Office
Prior art keywords
control
protection device
overload protection
relieved
pump
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Withdrawn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
EP84116265A
Other languages
German (de)
French (fr)
Other versions
EP0158740A2 (en
Inventor
Wolfgang Dipl.-Ing. Kötter
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0158740A2 publication Critical patent/EP0158740A2/en
Publication of EP0158740A3 publication Critical patent/EP0158740A3/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Withdrawn legal-status Critical Current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)
  • Fluid-Pressure Circuits (AREA)
  • Control And Safety Of Cranes (AREA)

Abstract

Es wird eine hydraulische Überlastungsschutzvorrich­ tung (10) für den Auslegerarm (11) eines Ladekrans vorge­ schlagen, bei der ein den Auslegerarm betätigender Hydro­ zylinder (16, 17) von einem Wegeventil (19,21) angesteuert wird, dessen Steuerschieber (22) zur Begrenzung des Last­ moments über ein druckgesteuertes Sicherheitsventil (41) mit Druckmittel von einer Pumpe (32) beaufschlagbar ist und somit aus einer lastmomenterhöhenden Arbeitsstellung (27) zumtndest in eine Mittelstellung (24) zurückstellbar bzw darin gegen Handbetätigung blockierbar ist. Das Wegeventil (19, 22) weist eine neben einer Rücklaufkammer (66) liegen­ de Steuerkammer (48) auf, in die der Steuerschieber mit seinem äußeren Kolbenabschnitt (64) ragt und die über eine Drossel (47) mit dem Sicherheitsventil (41) verbunden und über eine Steuerkante (68) zum Tank entlastbar ist. Die Steuerkante (68) arbeitet als hydraulischer Anschlag, der nach Rückstellung des Steuerschiebers (22) aus einer last­ momenterhöhenden Arbeitsstellung (27) in eine Mittelstel­ lung (24) den von der Pumpe (32) kommenden Druckmittel­ strom zum Tank (33) entlastet. It will be a hydraulic overload protection device device (10) for the boom arm (11) of a loading crane in which a hydro actuating the cantilever arm cylinder (16, 17) controlled by a directional valve (19,21) is, the control slide (22) to limit the load moments via a pressure-controlled safety valve (41) with pressure medium from a pump (32) and thus from a working position increasing the load torque (27) at least in a middle position (24) resettable or is lockable against manual operation. The directional valve (19, 22) has one next to a return chamber (66) de control chamber (48), into which the control spool with protrudes its outer piston portion (64) and the one Throttle (47) connected to the safety valve (41) and can be relieved to the tank via a control edge (68). The Control edge (68) works as a hydraulic stop that after resetting the control spool (22) from a load torque-increasing working position (27) in a middle position tion (24) the pressure medium coming from the pump (32) current to the tank (33) is relieved.

EP84116265A 1984-04-14 1984-12-22 Hydraulic overload protection device for a lifting apparatus Withdrawn EP0158740A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3414182 1984-04-14
DE19843414182 DE3414182A1 (en) 1984-04-14 1984-04-14 HYDRAULIC OVERLOAD PROTECTION DEVICE FOR A LIFTER

Publications (2)

Publication Number Publication Date
EP0158740A2 EP0158740A2 (en) 1985-10-23
EP0158740A3 true EP0158740A3 (en) 1988-10-19

Family

ID=6233616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116265A Withdrawn EP0158740A3 (en) 1984-04-14 1984-12-22 Hydraulic overload protection device for a lifting apparatus

Country Status (2)

Country Link
EP (1) EP0158740A3 (en)
DE (1) DE3414182A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK131618B (en) * 1973-01-26 1975-08-11 Hojbjerg Maskinfabrik As Crane, in particular truck crane with a load torque limiting control device.
DE2154631B2 (en) * 1970-11-04 1977-07-21 Hiab Foco AB, Hudiksvall (Schweden) Overload protection unit for loading crane - has safety valve with regulating and control pistons for isolation of hydraulic drive
EP0055247A2 (en) * 1980-12-23 1982-06-30 Firma PALFINGER Loading crane

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154631B2 (en) * 1970-11-04 1977-07-21 Hiab Foco AB, Hudiksvall (Schweden) Overload protection unit for loading crane - has safety valve with regulating and control pistons for isolation of hydraulic drive
DK131618B (en) * 1973-01-26 1975-08-11 Hojbjerg Maskinfabrik As Crane, in particular truck crane with a load torque limiting control device.
EP0055247A2 (en) * 1980-12-23 1982-06-30 Firma PALFINGER Loading crane

Also Published As

Publication number Publication date
DE3414182A1 (en) 1985-10-24
EP0158740A2 (en) 1985-10-23

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19841222

AK Designated contracting states

Designated state(s): DE FR GB IT

PUAL Search report despatched

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AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19881221

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KOETTER, WOLFGANG, DIPL.-ING.