GB686177A - Improvements relating to cranes - Google Patents

Improvements relating to cranes

Info

Publication number
GB686177A
GB686177A GB2469749A GB2469749A GB686177A GB 686177 A GB686177 A GB 686177A GB 2469749 A GB2469749 A GB 2469749A GB 2469749 A GB2469749 A GB 2469749A GB 686177 A GB686177 A GB 686177A
Authority
GB
United Kingdom
Prior art keywords
jib
extension
shaft
pulley
around
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
GB2469749A
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.)
Ransomes & Rapier Ltd
Original Assignee
Ransomes & Rapier 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
Application filed by Ransomes & Rapier Ltd filed Critical Ransomes & Rapier Ltd
Priority to GB2469749A priority Critical patent/GB686177A/en
Publication of GB686177A publication Critical patent/GB686177A/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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks
    • B66C2700/0364—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks with a slewing arm
    • B66C2700/0371—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks with a slewing arm on a turntable

Landscapes

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

Abstract

686,177. Jib cranes. RANSOMES & RAPIER, Ltd., and STOKES, A. S. Sept. 15, 1950. [Sept. 26, 1949] No. 24697/49. Class 78 (iv). Luffing. A single luffing rope 24 controls the movements of the jib 12 about its heel pivot 14 and of an extension 16 about a hinge 18 on the jib. The rope 24 passes from a drum 50, around pairs of pulleys on the shaft 48 and on a shaft 46 carried by the jib 12, and around pulleys on shafts 26 and 32 carried respectively by the jib 12 and by the extension 16 and is dead-ended to the shaft 26. Inward luffing movement of the jib 12 is limited by a stop 52. The balance of the system is such that the jib 12 is held on its stop 52 while the extension is lowered from its uppermost position as shown in full lines in Fig. 2 to the broken line position. The jib and extension are then connected for movement together by engagement of a cross-bar 58 secured to guys 54 on the extension with the end of slots 60 on the jib. When the extension has reached the horizontal it is restrained against further downward rotation by engagement of a further cross bar 84, carried by guys 82 on the extension, with a fixed stop 86: the main jib may be further lowered with the extension horizontal. The relative movement of the extension 16 and the jib 12 may be prevented or reduced by a catch 80 which may be moved to obstruct the movement of the cross-bar 58 in the slot 60. The extension may, as an alternative to the arrangement shown, move with the jib during the initial derricking out and alone subsequently. Balancing. To compensate for the variation in the ratio of the forces required to support the extension and the main jib under varying loads, the hoisting rope 62 is led from the winch 64 over guide pulleys 66 and 67, Fig. 3, around a pulley 68 on the shaft 32 near the heel of the extension, around a pulley 70 on the shaft 26 carried by the main jib and over a further pulley 72 on the shaft 32 to the jib-end pulley at the end of the extension. Specification 470,295 is referred to.
GB2469749A 1949-09-26 1949-09-26 Improvements relating to cranes Expired GB686177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2469749A GB686177A (en) 1949-09-26 1949-09-26 Improvements relating to cranes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2469749A GB686177A (en) 1949-09-26 1949-09-26 Improvements relating to cranes

Publications (1)

Publication Number Publication Date
GB686177A true GB686177A (en) 1953-01-21

Family

ID=10215831

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2469749A Expired GB686177A (en) 1949-09-26 1949-09-26 Improvements relating to cranes

Country Status (1)

Country Link
GB (1) GB686177A (en)

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