US3855954A - Jib cranes - Google Patents

Jib cranes Download PDF

Info

Publication number
US3855954A
US3855954A US00398917A US39891773A US3855954A US 3855954 A US3855954 A US 3855954A US 00398917 A US00398917 A US 00398917A US 39891773 A US39891773 A US 39891773A US 3855954 A US3855954 A US 3855954A
Authority
US
United States
Prior art keywords
jib
hook
link
axis
movement
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 - Lifetime
Application number
US00398917A
Other languages
English (en)
Inventor
D Quick
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.)
Navistar International Corp
Original Assignee
International Harverster Corp
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 International Harverster Corp filed Critical International Harverster Corp
Application granted granted Critical
Publication of US3855954A publication Critical patent/US3855954A/en
Assigned to NAVISTAR INTERNATIONAL CORPORATION reassignment NAVISTAR INTERNATIONAL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL HARVESTER COMPANY
Assigned to NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE reassignment NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: NAVISTAR INTERNATIONAL TRANSPORTATION CORP. (MERGED)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B66C23/62—Constructional features or details
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • 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
    • B66C2700/0392—Movement of the crane arm; Coupling of the crane arm with the counterweights; Safety devices for the movement of the arm

Definitions

  • ABSTRACT A jib crane wherein the hook is mounted on the jib for movement along the length of the jib, power means being provided to effect said movement of the hook in response to the raising and lowering of the jib.
  • movement of the hook is controlled so that the distance between the hook and the pivot axis of the jib remains within predetermined limits as the jib is raised or lowered.
  • This invention relates to jib cranes and particularly to mobile jib cranes such as are commonly constructed upon a truck or tractor chassis.
  • the object of the present invention to provide a jib crane wherein the position of the hook on the jib can be quickly and simply varied and once selected so that the distance of the hook from the machine remains substantially constant during raising and lowering of the jib.
  • a crane having a jib mounted for pivotal movement about a horizontal axis to effect raising and lowering of a load, a hook mounted on the jib for movement to vary the position of the hook on the jib relative to the pivot axis of the jib, powered means to effect said movement of the hook, and control means arranged to actuate said powered means in response to the pivotal movement of the jib so as to increase said distance as the jib pivots in one direction and decrease said distance as the jib pivots in the oppositedirection.
  • control means are arranged so that the horizontal distance between the hook and the jib pivot axis remains within predetermined limits as the jib is raised or lowered.
  • the powered means is a double acting hydraulic cylinder and the control means includes a hydraulic valve controlling the supply of fluid to the cylinder.
  • the valve is actuated through a linkage connected to the jib and the hook so that, when the jib is moved, the valve is actuated to energize the cylinder to effect a compensating movement to the hook and, when the required amount of movement of the hook is achieved, the valve is returned to a neutral position.
  • a crane comprising a support structure, a jib mounted on said support structure for pivotal movement relative thereto about ment of the jib to effect movement 'of the hook carrier relative to the jib to increase the distance measured in the direction of the length of the jib between the hook and the jib pivot axis as the jib is raised and to decrease said distance as the jib is lowered.
  • a valve' may be arranged to meter fluid to jib lifting cylinder and the hook moving cylinder in accordance with the jib angle to effect a compensating movement of the hook as the jib is raised and lowered.
  • the control for the powered means which affects the movement of the hook can be operated manually independent of the automatic control means sothat the operator may initially position the hook inv the desired location on the jib having regard to the weight of the load to be lifted.
  • the hook may be mounted on a track or carriageway attached to the jib and extending in a general direction of the length of the jib, so that the hook may be moved along the carriageway by the powered means as required.
  • the jib may be of a telescopic construction with one section pivoted to the main frame of the machine, and a hook carried by another section. In this construction, the position of the hook is varied by the powered means by extending or retracting the telescopic section.
  • the jib may comprise two articulated sections, the angular relations of which may be varied by the powered means, to achieve the required change in the position of the hook.
  • FIG. 1 is a schematic representation of a mobile jib crane
  • FIG. 2 is an enlarged view of portion of the jib and support frame, with a section of the jib broken away to a horizontal axis, means operably connected between the support structureand the jib to effect pivotal moveshow components 'of the mechanism disposed within the jib; and
  • FIG. 3 is a cross-sectional view takenalong line 3-3 in FIG. 2.
  • the crane comprises a vehicle 5 mounted on transport wheels 6 and carrying a jib 8 pivotally mounted at 9 to a support frame 10, mounted on the vehicle 5.
  • the pair of hydraulic lift cylinders 13 are mounted between the support frame 10 so that the outer end of the jib may be raised or lowered by extending or retracting the hydraulic cylinder 13 to cause the jib to pivotabout the connection thereof to the support frame.
  • the above described construction is typical of many well-known mobile jib cranes.
  • a pair of parallel rails 15 attached to the jib by a plurality of longitudinally spaced bracket assemblies 16.
  • the hook 18 is supported on a shaft 19 carrying apair of spaced rollers 20, which engage the respective rails 15.
  • the length of the rails 15, and the disposition thereof on the jib is such that the hook may be moved along the track to any working position within the designed capacity of the crane, having regard to the load to be lifted at that particular position.
  • the double acting hydraulic cylinder 22 is mounted to the jib with the free end of the piston rod 23 of the cylinder connected to the shaft 19 from which the hook 18 is suspended. Actuation of the hydraulic cylinder 22 causes the rollers to move along the tracks 15 in order to vary the position of the hook 18 on the jib relative to the pivot axis of the jib.
  • the telescopic control arm 25 is pivotally connected at the upper end to the bracket 26 secured to the jib, while the lower end of the control arm is pivotally connected to the lug 29 secured to the end of the piston rod 23 connected to the shaft 19.
  • the telescopic control arm 25 is in theposition shown in full outline in FIG. 2 and, as the hook is moved along the jib towards the fully extended position (shown in broken outline), the control arm 25 will pivot relative to the jib and retract andextend as necessary in accordance with the movement of the hook.
  • the control arm 25 is connected via the rod 30 to one arm 31 of the bell crank 32, pivotally mounted on the bracket 34, attached to the jib.
  • the other arm 36 of the bell crank is connected via the rod 38 to the spool 40 of the hydraulic control valve 41 mounted on the support frame 10. It will thus be seen that, as the jib pivots relative to the support frame and as the hook assembly moves along the jib, movement will be imparted to the spool 40 of the hydraulic valve
  • the hydraulic valve 41 is connected via the line 45 to a source of pressurized hydraulic fluid, and via the line 46 to a hydraulic fluid storage tank.
  • the respective ends of the double acting hydraulic cylinder 22 are each connected to ports of the valve so that fluid under pressure may be delivered to the respective ends of the double acting cylinder, depending upon the position of the spool of the valve, and fluid may be returned from either end of the cylinder to the storage tank.
  • the bell crank 32 as a unit will pivot about the pivot axis of the jib, and thus effect movement of the spool of the valve.
  • the direction in which the spool moves will be determined by'whether the jib is being raised or lowered, and the valve 41 is arranged to supply fluid to one or the other end of the hydraulic cylinder connected to the hook, depending on whether the jib is rising or falling.
  • the valve 41 when the jib is being raised, the valve will supply fluid to the cylinder to move the hook outwardly from the pivot axis of the jib and vice versa.
  • the hook is moved inwardly on the jib as the jibis lowered and vice versa, and thus, if the jib is lowered below the horizontal position, the hook will be moved closer to the machine frame as a result of the movement of the jib and this movement will be accumulative with the movement induced by the cylinder 22.
  • the reverse action applies as the jib is moved upwardly to the horizontal position.
  • the accumulating of the two hook movements in the below horizontal movement of the jib is of very minimal significance as the angle of movement of the jib is relatively small, and the combined movement has little effect on the stability of the crane when the jib is at a low angle.
  • the linkage mechanism may be suitablymodified to effect a change in the direction of hook movement as the jib moves through the horizontal position.
  • a crane having a jib pivotally mounted on a frame for pivotal movement about a horizontal axis, a hook supported on the jib, means for moving the hook along the jib for positioning the hook at a preselected horizontal distance from the axis, means for pivoting the jib about the axis, and means for actuating the hook moving means, wherein the improvement comprises:
  • a first link having a plurality of substantially straight telescopic segments and being pivotally connected at the opposite ends thereof respectively to the jib and to the moving means;
  • a second link having a plurality of crank arms and being pivotally mounted between the arms on the jib adjacent the axis;
  • a third link having a substantially straight and rigid body and being pivotally connected at one end to one of the segments of the first link and pivotally connected at the opposite end to one of the crank arms of the second link;
  • a fourth link having a substantially straight and rigid body and being pivotally connected at one end to another crank arm of the second link and pivotally connected at the opposite end to the actuating means for automatically operating the actuating means in response to pivotal movement of the jib for maintaining the hook at the preselected horizontal distance from the axis.
  • the moving means include a pair of rails connected to the jib, carriage having rollers and riding on the rails, the hook being dependently mounted on the carriage, and a double acting hydraulic ram and cylinder unit having one end mounted to the jib and the other end mounted to the carriage; and, wherein the actuating means include a hydraulic valve mounted on the frame and having a flow control spool connected to the opposite end of the fourth link, and hydraulic pipe lines connecting the hydraulic ram and cylinder unit to the hydraulic valve and the hydraulic valve to a source of hydraulic fluid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00398917A 1972-09-21 1973-09-17 Jib cranes Expired - Lifetime US3855954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB051972 1972-09-21

Publications (1)

Publication Number Publication Date
US3855954A true US3855954A (en) 1974-12-24

Family

ID=3765342

Family Applications (1)

Application Number Title Priority Date Filing Date
US00398917A Expired - Lifetime US3855954A (en) 1972-09-21 1973-09-17 Jib cranes

Country Status (4)

Country Link
US (1) US3855954A (enExample)
CA (1) CA1002004A (enExample)
FR (1) FR2213223B1 (enExample)
GB (1) GB1393225A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693384A (en) * 1985-12-20 1987-09-15 Gilmore Transportation Services, Inc. Excavator boom derrick
GB2222996A (en) * 1988-09-21 1990-03-28 Graham John Darby Lifting device for tractor; lifting attachment
US5188247A (en) * 1991-11-04 1993-02-23 Keith Jastrow Lifting apparatus
US20220219950A1 (en) * 2021-01-08 2022-07-14 International Business Machines Corporation Jib crane mechanism

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443421A1 (fr) * 1978-12-08 1980-07-04 Gesa Bras de levage auto-chargeant mobile
CN115258986A (zh) * 2022-07-25 2022-11-01 中国石油化工股份有限公司 一种多功能伸缩桅杆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595029A (en) * 1922-10-31 1926-08-03 Smith Robert Arthur Crane for lifting, lowering, and transporting loads
US2548038A (en) * 1947-10-24 1951-04-10 Leona N Moliskey Fluid pressure actuated lifting apparatus
US3352441A (en) * 1964-10-28 1967-11-14 Alden Lars Anders Gustaf Crane boom
US3373885A (en) * 1966-07-08 1968-03-19 Virgil E. Allison Loading attachment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279493A (fr) * 1960-11-10 1961-12-22 Grue perfectionnée

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595029A (en) * 1922-10-31 1926-08-03 Smith Robert Arthur Crane for lifting, lowering, and transporting loads
US2548038A (en) * 1947-10-24 1951-04-10 Leona N Moliskey Fluid pressure actuated lifting apparatus
US3352441A (en) * 1964-10-28 1967-11-14 Alden Lars Anders Gustaf Crane boom
US3373885A (en) * 1966-07-08 1968-03-19 Virgil E. Allison Loading attachment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693384A (en) * 1985-12-20 1987-09-15 Gilmore Transportation Services, Inc. Excavator boom derrick
GB2222996A (en) * 1988-09-21 1990-03-28 Graham John Darby Lifting device for tractor; lifting attachment
US5188247A (en) * 1991-11-04 1993-02-23 Keith Jastrow Lifting apparatus
US20220219950A1 (en) * 2021-01-08 2022-07-14 International Business Machines Corporation Jib crane mechanism
US11945104B2 (en) * 2021-01-08 2024-04-02 International Business Machines Corporation Jib crane mechanism

Also Published As

Publication number Publication date
DE2346789B2 (de) 1977-06-23
FR2213223A1 (enExample) 1974-08-02
FR2213223B1 (enExample) 1977-09-09
CA1002004A (en) 1976-12-21
GB1393225A (en) 1975-05-07
DE2346789A1 (de) 1974-04-11

Similar Documents

Publication Publication Date Title
US2646182A (en) Loading and unloading apparatus
US2990072A (en) Material handling mechanism
US4674944A (en) Forklift variable reach mechanism
US2911111A (en) Mobile hydraulic crane
US4602462A (en) Boom articulating mechanism for aerial devices
JPH1087278A (ja) 自走クレーン
US3481489A (en) Means for extending and retracting boom sections of a crane
US3253716A (en) Crane having articulated boom
US4363409A (en) Multi-purpose utility vehicle
US4016992A (en) Lift truck with rotatable load-handling apparatus
US3032207A (en) Loading boom with adjustable extension arm
US4274795A (en) Load carrying vehicles
US2961102A (en) Hydraulic swinging boom-type hoist
US3855954A (en) Jib cranes
US3478894A (en) Extensible and retractable boom construction for cranes
CN210505307U (zh) 叉吊轮式起重机
US2774484A (en) Gantry
US2350641A (en) Truck loader
US3554395A (en) Crane
US2763385A (en) Tractor mounted hydraulic loader
US2674378A (en) Removable counter weight for truck cranes
US3198359A (en) Reaching type loader
US2251435A (en) Tipping vehicle
US2407012A (en) Safety device for dump trucks
US3100049A (en) Outriggers for vehicles

Legal Events

Date Code Title Description
AS Assignment

Owner name: NAVISTAR INTERNATIONAL CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004546/0650

Effective date: 19860220

Owner name: NAVISTAR INTERNATIONAL CORPORATION, ILLINOIS

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004546/0650

Effective date: 19860220

AS Assignment

Owner name: NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE,

Free format text: MERGER;ASSIGNOR:NAVISTAR INTERNATIONAL TRANSPORTATION CORP. (MERGED);REEL/FRAME:005195/0610

Effective date: 19870317