GB385601A - Improvements in jib cranes, derricks and the like - Google Patents

Improvements in jib cranes, derricks and the like

Info

Publication number
GB385601A
GB385601A GB925531A GB925531A GB385601A GB 385601 A GB385601 A GB 385601A GB 925531 A GB925531 A GB 925531A GB 925531 A GB925531 A GB 925531A GB 385601 A GB385601 A GB 385601A
Authority
GB
United Kingdom
Prior art keywords
jib
pivoted
indicator
lever
bell
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
GB925531A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB925531A priority Critical patent/GB385601A/en
Publication of GB385601A publication Critical patent/GB385601A/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

Abstract

385,601. Jib cranes. FARNSWORTH, A. W. Devonshire Club, St. James's Street, London. March 26, 1931, Nos. 9255 and 17823. [Class 78 (iv).] A safe-load indicator, or warning or cut-out device for luffing cranes, comprises a bell-crank or like angle lever of relatively small dimensions pivoted on the jib, one arm of the lever being subject to a force due to the load, acting with a smaller leverage as the jib is raised, and the other arm being connected with the indicator or other safety device. A correcting device may be employed to move the indicator scale as the jib is luffed. As shown in Fig. 1, the head-sheave B is carried on the short arms 2 of a pair of bell-crank levers pivoted on the jib at 6, the long arms 4 of the levers bear on springs 7. The motion of the lever is transmitted by a member 10 to a pointer moving over a scale marked " safe " and " danger." The levers are arranged so that the effective radius of the short arms 2 is very small when the jib is nearly vertical, but the arms 2 are long enough to accommodate the bearings for the pins 1, 6. In a modification, Fig. 3, the load-sheave D is supported in a bight of the rope C, which is anchored at 1 to the bell-crank lever 2, 4. The indicator may be connected to a gong or buzzer. A correcting device (not claimed), which may be used with the invention, comprises a scale 13, Fig. 5, marked " safe " and " danger " pivoted on the jib and moved by a cam 22 also pivoted on the jib and connected with the base F by a link 25, or 251.
GB925531A 1931-03-26 1931-03-26 Improvements in jib cranes, derricks and the like Expired GB385601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB925531A GB385601A (en) 1931-03-26 1931-03-26 Improvements in jib cranes, derricks and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB925531A GB385601A (en) 1931-03-26 1931-03-26 Improvements in jib cranes, derricks and the like

Publications (1)

Publication Number Publication Date
GB385601A true GB385601A (en) 1932-12-28

Family

ID=9868446

Family Applications (1)

Application Number Title Priority Date Filing Date
GB925531A Expired GB385601A (en) 1931-03-26 1931-03-26 Improvements in jib cranes, derricks and the like

Country Status (1)

Country Link
GB (1) GB385601A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1138909B (en) * 1960-03-10 1962-10-31 Demag Ag Shock absorbers for grapple winches
DE1156211B (en) * 1961-03-18 1963-10-24 Ernst Henkel Device for measuring and monitoring the load torque on crane systems or the like.
US5131801A (en) * 1990-12-10 1992-07-21 Tandy Corporation Forklift fork tilt angle indicator
AT399518B (en) * 1990-08-10 1995-05-26 Glanzstoff Austria SPINNING MACHINE FOR CONTINUOUS PRODUCTION OF FILAMENTS
CN102384241A (en) * 2011-07-14 2012-03-21 山起重型机械股份公司 Fixed pulley device of crane

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1138909B (en) * 1960-03-10 1962-10-31 Demag Ag Shock absorbers for grapple winches
DE1156211B (en) * 1961-03-18 1963-10-24 Ernst Henkel Device for measuring and monitoring the load torque on crane systems or the like.
AT399518B (en) * 1990-08-10 1995-05-26 Glanzstoff Austria SPINNING MACHINE FOR CONTINUOUS PRODUCTION OF FILAMENTS
US5131801A (en) * 1990-12-10 1992-07-21 Tandy Corporation Forklift fork tilt angle indicator
CN102384241A (en) * 2011-07-14 2012-03-21 山起重型机械股份公司 Fixed pulley device of crane

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