US1338726A - Luffing mechanism for jib-cranes - Google Patents

Luffing mechanism for jib-cranes Download PDF

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Publication number
US1338726A
US1338726A US327641A US32764119A US1338726A US 1338726 A US1338726 A US 1338726A US 327641 A US327641 A US 327641A US 32764119 A US32764119 A US 32764119A US 1338726 A US1338726 A US 1338726A
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Prior art keywords
jib
cranes
pulley
pulleys
rocking
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US327641A
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Goudie John Nicolson
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Individual
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    • 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
    • B66C23/06—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 with jibs mounted for jibbing or luffing movements
    • B66C23/08—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 with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths
    • B66C23/10—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 with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-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
    • B66C2700/0307—Cranes in which it is essential that the load is moving horizontally during the luffing movement of the arm or jib

Definitions

  • This invention relates to jib cranes which are designed toizif the load along a horizontal path and it consists in an improveducing mechanism comprising a rocking beam fulcrumed in the free end of the jib and equipped at opposed ends with pulleys wrapped bythe hoisting rope, and means for rocking the beam, the arrangement being such that the vertical component of the outward movement of the lower pulley is balanced by the oppositely directed vertical component of the inward movement of the upper pulley whereby the load is lufed in a substantially horizontal path.
  • the improvedizing mechanism comprises a rocking beam A fulcrumed at B on the free end of the jib C and equipped at its upper end with a pulley D and at its lower end with a pulley E, the requisite rocking movement being imparted to the beam by means of a suitable rod F connected to a bell-crank-lever G operable by a hand controlled screw and nut mechanism as at II under the control of the operator.
  • the hoisting rope I which is coiled around a suitable hoisting drum K and passes over a guide pulley L, embraces'the pulleys D, E, and is preferably held against disengagement from the pulley E by a guard M.
  • the base of the jib is preferably mounted in a ball bearing N provided with feet O permitting insertion under the base of a suitable jacl-up truck.
  • the base ' may be secured to a floor by suitable ties P.
  • I claim 1 The combination with a jib of a rocking beam fulcrumed in the free end of said jib, two pulleys one disposed at the upper end of said beam and one disposed at the lower end of said beam, a hoisting rope wrapping said pulleys and means for rocking said beam, the disposition of the fulcrum of the beam in relation to the pulleys being such that the vertical component of the outward movement of the lower pulley is balanced by the oppositely directed vertical component of the inward movement of the upper pulley whereby the load is luffed in a substantially horizontal path, substantially as described.

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

Description

J. N. GOUDIE. LUFFING. MEGHANISM FOR JIB CRNES.
APPLICATION FILED ocT. I. 1919.
1,338,726. y Patented May 4,1920.
am /Snani/ x Mofa.,
zzz/70a JOHN NICOLSON GOUDIE, OF HUNTERS QUAY, SCOTLAND.
LUFFING MECHANISM FOR JIB-CRANES.
Application filed October 1, 1919.
To all whom t may concern:
Be it known that I, JOHN NicoLsoN Gomma, a Subj ect of the King of the United Kingdom of Great Britain and Ireland, and residing at Hunters Quay, Firth of Clyde, Scotland, have invented a certain new and useful Improvement in Lu'fling Mechanism for Jib-Cranes, of which the following is a specification.
This invention relates to jib cranes which are designed to luif the load along a horizontal path and it consists in an improved luing mechanism comprising a rocking beam fulcrumed in the free end of the jib and equipped at opposed ends with pulleys wrapped bythe hoisting rope, and means for rocking the beam, the arrangement being such that the vertical component of the outward movement of the lower pulley is balanced by the oppositely directed vertical component of the inward movement of the upper pulley whereby the load is lufed in a substantially horizontal path.
The invention is illustrated in elevation in the ligure of the accompanying drawing.
As shown the improved luing mechanism comprises a rocking beam A fulcrumed at B on the free end of the jib C and equipped at its upper end with a pulley D and at its lower end with a pulley E, the requisite rocking movement being imparted to the beam by means of a suitable rod F connected to a bell-crank-lever G operable by a hand controlled screw and nut mechanism as at II under the control of the operator.
The hoisting rope I, which is coiled around a suitable hoisting drum K and passes over a guide pulley L, embraces'the pulleys D, E, and is preferably held against disengagement from the pulley E by a guard M.
When it is desired to luf the load, it is requisite merely to rock the beam A into a position such as is indicated by the dotted lines.
It will be readily seen that the vertical component of the outward movement of the lower pulley E is balanced by the oppositely directed vertical component vof the inward movement of the upper pulley D and that Specification of Letters Patent.
Patented May 4, 1920.
Serial No. 327,641.
the load will be constrained to follow a substantially horizontal path. The base of the jib is preferably mounted in a ball bearing N provided with feet O permitting insertion under the base of a suitable jacl-up truck. The base 'may be secured to a floor by suitable ties P.
I claim 1. The combination with a jib of a rocking beam fulcrumed in the free end of said jib, two pulleys one disposed at the upper end of said beam and one disposed at the lower end of said beam, a hoisting rope wrapping said pulleys and means for rocking said beam, the disposition of the fulcrum of the beam in relation to the pulleys being such that the vertical component of the outward movement of the lower pulley is balanced by the oppositely directed vertical component of the inward movement of the upper pulley whereby the load is luffed in a substantially horizontal path, substantially as described.
2. rIhe combination with a jib of a rocking beam fulcrumed in the free end of said jib, two pulleys one disposed at the upper end of said beam and one disposed at the lower end of said beam, a hoisting rope wrapping said pulleys and a bell-crank lever on said jib, a rod operatively connecting said beam with said bell-crank lever and manually operable screw and nut mechanism for operating said bell-crank lever for rocking said beam, the disposition of the fulcrum of the beam in relation to the pulleys being such that the vertical component of the outward movement of the lower pulley is balancedk by the oppositely directed vertical component of the inward movement of the upper pulley whereby the load is lufl'ed in a substantially horizontal path, substantiallyl as described.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
JOHN NICOLSON GOUDIE.
Witnesses KATE FOTHERINGHAM, ISABEL ROLLO.
US327641A 1919-10-01 1919-10-01 Luffing mechanism for jib-cranes Expired - Lifetime US1338726A (en)

Priority Applications (1)

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US327641A US1338726A (en) 1919-10-01 1919-10-01 Luffing mechanism for jib-cranes

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US327641A US1338726A (en) 1919-10-01 1919-10-01 Luffing mechanism for jib-cranes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030170104A1 (en) * 2002-03-06 2003-09-11 Carroll Elmer C. Vehicle boom assembly and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030170104A1 (en) * 2002-03-06 2003-09-11 Carroll Elmer C. Vehicle boom assembly and method
US6860703B2 (en) * 2002-03-06 2005-03-01 Elmer C. Carroll, Jr. Vehicle boom assembly and method

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