GB362285A - Improvements in or relating to luffing jib cranes - Google Patents

Improvements in or relating to luffing jib cranes

Info

Publication number
GB362285A
GB362285A GB828431A GB828431A GB362285A GB 362285 A GB362285 A GB 362285A GB 828431 A GB828431 A GB 828431A GB 828431 A GB828431 A GB 828431A GB 362285 A GB362285 A GB 362285A
Authority
GB
United Kingdom
Prior art keywords
lever
cam
pivot
pull
link
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
GB828431A
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.)
EDWIN FAWCITT
THOMAS SMITH AND SONS RODLEY L
Original Assignee
EDWIN FAWCITT
THOMAS SMITH AND SONS RODLEY L
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 EDWIN FAWCITT, THOMAS SMITH AND SONS RODLEY L filed Critical EDWIN FAWCITT
Priority to GB828431A priority Critical patent/GB362285A/en
Publication of GB362285A publication Critical patent/GB362285A/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

Landscapes

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

Abstract

362,285. Jib cranes. SMITH & SONS (RODLEY), Ltd., T. and FAWCITT, E., Steam & Electric Crane Works, Rodley, Leeds. March 18, 1931, No. 8284. [Class 78 (iv).] Overload indicator mechanism of the kind which is operated by the pull on the luffing rope has the rope connected to a weight or spring-loaded lever system operating the indicator in which the leverage is varied by a cam and linkage in accordance with the maximum safe load at different radii. The pointer 1 works over an indicator quadrant 2 and is actuated by an arm 3 connected by a link 4 to a lever 5 working on a pivot 6 and provided with a weight 7 or spring. The end of the luffing rope 8 is connected to links 11 mounted on a pivot 12 on the lever 5. The weight 7 normally overcomes the pull of the luffing rope so that the pointer indicates a safe load. A link 13 is pivotally connected to the upper end of the links 11 and to a bent lever 14 mounted on a pivot 15 on the crane structure and having at its free end a roller engaging a cam 17 having an undulating contour. The cam is connected by an arm 19 and link 20 to the jib 9. The arrangement is such that variations in the inclination of the jib cause variations in the effective leverage of the pull on the lever 5 and corresponding indications of the pointer. In a modification a toggle linkage is arranged between the cam mechanism and the luffing rope linkage.
GB828431A 1931-03-18 1931-03-18 Improvements in or relating to luffing jib cranes Expired GB362285A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB828431A GB362285A (en) 1931-03-18 1931-03-18 Improvements in or relating to luffing jib cranes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB828431A GB362285A (en) 1931-03-18 1931-03-18 Improvements in or relating to luffing jib cranes

Publications (1)

Publication Number Publication Date
GB362285A true GB362285A (en) 1931-12-03

Family

ID=9849550

Family Applications (1)

Application Number Title Priority Date Filing Date
GB828431A Expired GB362285A (en) 1931-03-18 1931-03-18 Improvements in or relating to luffing jib cranes

Country Status (1)

Country Link
GB (1) GB362285A (en)

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