GB595209A - Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus - Google Patents

Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus

Info

Publication number
GB595209A
GB595209A GB843445A GB843445A GB595209A GB 595209 A GB595209 A GB 595209A GB 843445 A GB843445 A GB 843445A GB 843445 A GB843445 A GB 843445A GB 595209 A GB595209 A GB 595209A
Authority
GB
United Kingdom
Prior art keywords
jib
luffing
control
lever
cranes
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
GB843445A
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.)
EDWARD ERNEST MILLS
Anglo Iranian Oil Co Ltd
Original Assignee
EDWARD ERNEST MILLS
Anglo Iranian Oil Co Ltd
Filing date
Publication date
Application filed by EDWARD ERNEST MILLS, Anglo Iranian Oil Co Ltd filed Critical EDWARD ERNEST MILLS
Publication of GB595209A publication Critical patent/GB595209A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes 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
    • B66C23/88Safety gear
    • B66C23/92Snubbers or dashpots for preventing backwards swinging of jibs, e.g. in the event of cable or tackle breakage

Landscapes

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

Abstract

595,209. Jib cranes; end stop-gears. ANGLO-IRANIAN OIL CO., Ltd., and MILLS, E. E. April 5, 1945, No. 8434. f Classes 78(iv) and 78(v)] [Also in Group XXXVII] A device applied to the luffing unit of jib cranes or like apparatus for preventing overluffing comprises two control units operated respectively by the luffing control member when this is set into the up position and by the jib when this reaches its inner limiting position, the arrangement being, such that when both control units are operated the luffing unit is rendered ineffective for further upward movement of the jib. In the embodiment shown in which luffing of the jib is effected by a petrol motor controlled by a hand-lever b, the control device comprises two switches c, d, [see Group XXXVII], which are arranged in a 'circuit for earthing the magneto through the frame of the crane and which are adapted to be closed by the lever when this is moved to the " up " position and by the jib when it reaches its upward limiting position, respectively. When the luffing unit is an electric motor closure of the two switches serves to interrupt the supply to the motor and if necessary operate a brake. In the case of a Diesel or like engine the control circuit may serve to operate a solenoid to disengage a driving clutch.
GB843445A 1945-04-05 Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus Expired GB595209A (en)

Publications (1)

Publication Number Publication Date
GB595209A true GB595209A (en) 1947-11-28

Family

ID=1629334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB843445A Expired GB595209A (en) 1945-04-05 Improvements in and relating to safety devices for preventing over-luffing in jib cranes and like apparatus

Country Status (1)

Country Link
GB (1) GB595209A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840244A (en) * 1953-06-22 1958-06-24 Jr Thomas W Thomas Boom stop ram
GB2314550A (en) * 1996-06-27 1998-01-07 Seatrax Inc Hdraulic boom stop for a crane
CN102730581A (en) * 2012-06-29 2012-10-17 上海三一科技有限公司 Main luffing mast rope collection operating device and crane including same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840244A (en) * 1953-06-22 1958-06-24 Jr Thomas W Thomas Boom stop ram
GB2314550A (en) * 1996-06-27 1998-01-07 Seatrax Inc Hdraulic boom stop for a crane
GB2314550B (en) * 1996-06-27 2000-06-28 Seatrax Inc Hydraulic boom stop
CN102730581A (en) * 2012-06-29 2012-10-17 上海三一科技有限公司 Main luffing mast rope collection operating device and crane including same

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