GB1126727A - Safe load control device for cranes - Google Patents

Safe load control device for cranes

Info

Publication number
GB1126727A
GB1126727A GB32175/67A GB3217567A GB1126727A GB 1126727 A GB1126727 A GB 1126727A GB 32175/67 A GB32175/67 A GB 32175/67A GB 3217567 A GB3217567 A GB 3217567A GB 1126727 A GB1126727 A GB 1126727A
Authority
GB
United Kingdom
Prior art keywords
boom
linkage
switch
elevation
fluid
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
Application number
GB32175/67A
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.)
Grove Manufacturing Co
Original Assignee
Grove Manufacturing Co
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 Grove Manufacturing Co filed Critical Grove Manufacturing Co
Publication of GB1126727A publication Critical patent/GB1126727A/en
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/06—Cranes in which the lifting movement is done with a hydraulically controlled plunger
    • B66C2700/062—Cranes in which the lifting movement is done with a hydraulically controlled plunger mounted on motor vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1,126,727. Safety devices for jib-cranes. GROVE MFG. CO. 12 July, 1967 [21 July, 1966], No. 32175/67. Heading B8B. A safe load control device for a telescopic boom, comprised of a base-section 1, a midsection 2 and a fly-section 3, pivoted at 6 to a pair of supports 7 comprises an hydraulic pressure switch 19 with a fluid pressure input from fluid motors 10, 11 for luffing the boom and a mechanical input through a linkage 40 sensing the elevation of the boom through tilting of the fluid motors 10, 11. The switch 19 receives the fluid pressure through a line 39 and acts through a piston-rod 24 to close a microswitch 34 against the action of a compression spring 29 the loading of which is varied by the linkage 40 in accordance with the elevation attitude of the boom. There is thus a differential action in the switch 19 between boom elevation information through the linkage 40 and load information through the pressure in the fluid motors 10, 11. The microswitch 34 when closed operates a warning light and an audio alarm and, through a combined electrical-hydraulic circuit, Fig. 6 (not shown), prevents the operation of any of the controls for the apparatus except in the direction to reduce the overload.
GB32175/67A 1966-07-21 1967-07-12 Safe load control device for cranes Expired GB1126727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US566856A US3371800A (en) 1966-07-21 1966-07-21 Safe load control device for cranes

Publications (1)

Publication Number Publication Date
GB1126727A true GB1126727A (en) 1968-09-11

Family

ID=24264683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32175/67A Expired GB1126727A (en) 1966-07-21 1967-07-12 Safe load control device for cranes

Country Status (3)

Country Link
US (1) US3371800A (en)
DE (1) DE1531187A1 (en)
GB (1) GB1126727A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461989A (en) * 1967-11-29 1969-08-19 Chance Co Ab Mechanism for preventing excessive relative swinging of an articulated aerial device
US3641551A (en) * 1968-12-19 1972-02-08 Grove Mfg Co Safe load control system for telescopic 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
DE2400310C3 (en) * 1974-01-04 1981-02-26 Erhard 5509 Kell Kirsten Tilting moment protection for a telescopic jib crane
US4146998A (en) * 1977-02-16 1979-04-03 Teco, Inc. Position responsive valve for controlling the retraction rate of a lower boom in an articulated boom assembly
FR2390718A1 (en) * 1977-05-13 1978-12-08 Preux Roger SYSTEM FOR MEASURING THE FORCE EXERCISED ON TWO OR MORE HYDRAULIC CYLINDERS SUPPORTING THE SAME LOAD
FR2418766A1 (en) * 1978-03-01 1979-09-28 Michel Gutierrez IMPROVEMENT IN HYDRAULIC CONTROLLED LIFTING DEVICES
DE3678905D1 (en) * 1985-11-27 1991-05-29 Oil Control Spa HYDRAULIC LOAD LIMITING DEVICE FOR HYDRAULIC CRANES.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL95141C (en) * 1955-03-12
US3269560A (en) * 1964-12-28 1966-08-30 Drott Mfg Corp Safety control for cranes

Also Published As

Publication number Publication date
US3371800A (en) 1968-03-05
DE1531187A1 (en) 1969-07-31

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