US3615067A - Load balancer - Google Patents

Load balancer Download PDF

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Publication number
US3615067A
US3615067A US808424A US3615067DA US3615067A US 3615067 A US3615067 A US 3615067A US 808424 A US808424 A US 808424A US 3615067D A US3615067D A US 3615067DA US 3615067 A US3615067 A US 3615067A
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US
United States
Prior art keywords
arm
force
arms
load
balancer
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
US808424A
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English (en)
Inventor
Noel G Goudreau
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.)
CONCO-TELLUS Inc
ConocoPhillips Co
Original Assignee
Conoco Inc
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 Conoco Inc filed Critical Conoco Inc
Application granted granted Critical
Publication of US3615067A publication Critical patent/US3615067A/en
Assigned to CONCO-TELLUS INC. reassignment CONCO-TELLUS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HEICO, INC.,
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66C23/005—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 balanced jib, e.g. pantograph arrangement, the jib being moved manually

Definitions

  • This invention relates to a loading balancer assembly wherein four arms are utilized to form a parallelogram linkage with one of the arms including a downward, load bearing extension having an offset portion so that the load can be moved around obstructions. Another of the arms is counterbalanced and pivotally mounted on a standard so that the overall linkage can be pivoted to raise or lower the load. Furthermore, the load bearing arm may be moved from side to side. To provide balancing for the load, a hydraulic cylinder may be used as a force a plying means to one of the arms if the same is coupled thereto by a connection that will permit relative horizontal movement therebetween.
  • a spring reel having a spring loaded cable extending therefrom is mounted in such a way that the cable may extend to one of the arms to apply a generally horizontal force thereto, which force provides a moment which is equal and opposite to a moment provided by the offset center of gravity of the load bearing arm due to the offset therein.
  • FIG. 1 is a side elevation of a loading balancer assembly embodying the invention
  • FIG. 2 is a fragmentary, enlarged side elevation illustrating force applying means provided in the balancer assembly according to the invention.
  • FIG. 3 is a schematic illustrating the static vectors involved in the invention.
  • FIG. 1 An exemplary embodiment of a balancer made according to the invention is illustrated in FIG. 1 and is seen to be supported from an overhead track 10 by means of a trolley 11 having supporting wheels 12 and 13 engaged with the track.
  • a hanger 14 depends from the trolley 11 and has a pair of spaced depending arms 15 (only one of which is shown) which are each formed of a pair of spaced apart plates.
  • Mounting bracket extends from a location between the upper ends of the arms 15 to mount pivotally, a fluid cylinder 21 having a piston rod 22 connected by a pin 23 to a pair of spaced apart side plates 24 (only one of which is shown), with the pin 23 extending transversely therebetween.
  • This force applied to the follower shaft 57 is transmitted to a fourth arm of the parallelogram linkage to the first arm 50.
  • This fourth arm comprises a pair of spaced links (only one of which is shown) which receive at their lower ends the follower shaft 57 and at their upper ends carry a link pin 67 which pivotally connects to the first arm 50.
  • the work support arm 54 carries a work holding fixture 70 at its lower end for engaging a workpiece 73 shown in broken lines.
  • the fixture 70 is pivotally mounted at 74 to the lower extremity of the work support arm 54.
  • Other fixtures including a swivel hook, could be used.
  • a load held by fixture 70 can be balanced to provide for easy manual manipulation thereof by controlling the amount of pressure applied to the cylinder 21 which, because of the construction including the parallelogram linkage, would cause constant balancing of the load in any of the range of positions for the loading balancer.
  • force applying means are provided to provide an equal and opposite moment about the pivot point 53 and such means may be best understood with reference to FIG. 2.
  • a spring reel 90 of conventional construction is mounted on a pivot 92 and has a wire rope cable 94 extending therefrom, the latter being spring loaded as is well-known in the art.
  • a rotatable sheave 96 is mounted on one of the side plates 24 by any suitable means adjacent the ends of the slots 59 and the cable 94 is passed about the same and then secured to the third arm 55 by a nut or other suitable fastener 98 associated with the pivot point 57.
  • the spring reel 90 will cause a force to be applied to the third arm 55 in a generally horizontal direction, which force will act towards the right as viewed in FIG. 2.
  • the applied force is constant for all positions of the pivot point 57 in slot 59.
  • the work-support arm 54 includes an offset portion in the lower arm portion 81 so that the center of gravity of the arm is at a point 100 also designated by the legend CG.
  • the force of gravity acting on the center of gravity at the point 100 provides a force acting in the direction of an arrow 102 and designated F which force is spaced from the line defined by the pivot points 53, 56 and 74 by a distance designated D
  • F force acting in the direction of an arrow 102 and designated F which force is spaced from the line defined by the pivot points 53, 56 and 74 by a distance designated D
  • M is equal to the product of the downward force or weight of the arm F and the distance D
  • a force F is also acting at the pivot point 57 which will be applied to the pivot point 56 thru the third arm 55.
  • the point of action of the force F is separated from the fulcrum point 53 by a distance D, and the product of the force F and D will provide a moment M tending to rotate the arm 54 in a counterclockwise direction about the point 53.
  • the force applying means provided in the form of the spring reel 90 in effect act upon the work supporting arm by virtue of the interconnection by the cable 94 to the third arm 55 which, in turn, is connected. to the second, or work supporting arm 54.
  • a force could be applied to the second arm 54 by suitable connections other than those shown.
  • the illustrated construction is preferred to the extent that the force applying means may be made relatively compact with respect to the remainder of the balancing.
  • a loading balancer assembly including a mount having a base member; a generally horizontal first arm pivotally mounted on said base member for rotation about a generally horizontal axis; a generally vertical second arm adapted to receive a load to be hoisted and balanced by said assembly, said second arm being pivotally connected to one end of said first arm and including an offset portion between its ends; a third arm pivotally connected to said second arm; and a fourth arm pivotally connected at one end to said first arm and at its other end to said third arm, said arms between said pivotal connections forming a parallelogram; and a counterweight operatively connected to one of said arms; the improvement comprising: means for applying a force to one of said arms to produce a torque substantially equal and opposite to the torque produced by the weight of the offset portion of the second arm.
  • a load balancer assembly according to claim 1 wherein said force applying means is connected to one of said arms to apply the force in a generally horizontal direction.
  • a load balancer assembly according to claim 4 wherein said spring means comprises a spring reel affixed to said base member and having a spring loaded cable extending therefrom to one of said arms.
  • a load balancer assembly according to claim 5 wherein said cable is connected to said third arm; and roller means interposed between said spring reel and said third arm and engaging said cable so that said cable extends from said roller means to said third arm in a generally horizontal direction.
  • a loading balancer assembly including a mount having a base member; a generally horizontal first arm pivotally mounted on said base member for rotation about a generally horizontal axis; a generally vertical second arm adapted to receive a load to be hoisted and balanced by said assembly, said second arm being pivotally connected to one end of said first arm and including an oifset portion between its ends; a third arm pivotally connected to said second arm; and a fourth arm pivotally connected at one end to said first arm and at its other end to said third arm, said arms between said pivotal connections forming a parallelogram; a counterweight operatively connected to one of said arms; means for applying a generally vertical force to said third arm; and means interconnecting said third arm and said generally vertical force applying means to allow relative horizontal movement therebetween; the improvement comprising: a means for applying a force to said second arm to produce a torque substantially equal and opposite to the torque produced by the weight of the offset portion of the second arm, said last named force applying means comprising spring means.
  • said interconnecting means comprises at least one plate extending adjacent said base member and including a generally horizontal guide slot, to receive a roller carried by both said third and fourth arms; and said spring means includes a spring reel secured to said plate and having a spring loaded cable extending therefrom, a sheave mounted on said plate adjacent one end of said guide slot, said cable being trained about said sheave from said spring reel and secured to the pivotal connection between said third and fourth arms.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Manipulator (AREA)
  • Handcart (AREA)
US808424A 1969-03-19 1969-03-19 Load balancer Expired - Lifetime US3615067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80842469A 1969-03-19 1969-03-19

Publications (1)

Publication Number Publication Date
US3615067A true US3615067A (en) 1971-10-26

Family

ID=25198723

Family Applications (1)

Application Number Title Priority Date Filing Date
US808424A Expired - Lifetime US3615067A (en) 1969-03-19 1969-03-19 Load balancer

Country Status (5)

Country Link
US (1) US3615067A (de)
DE (1) DE1959456C3 (de)
FR (1) FR2033711A5 (de)
GB (1) GB1250082A (de)
SE (1) SE366003B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945597A (en) * 1973-03-07 1976-03-23 J. D. Moller Optische Werke Gmbh Microsurgical operating unit
US4736922A (en) * 1985-06-03 1988-04-12 Karapita Alexander D Suspension system
WO1998015487A1 (en) * 1996-05-31 1998-04-16 Karl Helge Vestin Device for weight outbalancing in connection with lifts

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427995A1 (fr) * 1978-06-05 1980-01-04 Pernot Alain Dispositif de manutention omnidirectionnel
CN106239475B (zh) * 2016-09-13 2018-07-31 渤海大学 悬挂式气动平衡移载机械手

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945597A (en) * 1973-03-07 1976-03-23 J. D. Moller Optische Werke Gmbh Microsurgical operating unit
US4736922A (en) * 1985-06-03 1988-04-12 Karapita Alexander D Suspension system
WO1998015487A1 (en) * 1996-05-31 1998-04-16 Karl Helge Vestin Device for weight outbalancing in connection with lifts

Also Published As

Publication number Publication date
FR2033711A5 (de) 1970-12-04
GB1250082A (de) 1971-10-20
DE1959456A1 (de) 1970-09-24
SE366003B (de) 1974-04-08
DE1959456C3 (de) 1974-09-12
DE1959456B2 (de) 1974-02-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CONCO-TELLUS INC., MENDOTA, IL. A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HEICO, INC.,;REEL/FRAME:003828/0909

Effective date: 19810101