EP0621227A2 - Gelenkiger Ladearm für Baumstämme - Google Patents

Gelenkiger Ladearm für Baumstämme Download PDF

Info

Publication number
EP0621227A2
EP0621227A2 EP94301603A EP94301603A EP0621227A2 EP 0621227 A2 EP0621227 A2 EP 0621227A2 EP 94301603 A EP94301603 A EP 94301603A EP 94301603 A EP94301603 A EP 94301603A EP 0621227 A2 EP0621227 A2 EP 0621227A2
Authority
EP
European Patent Office
Prior art keywords
boom
pivot
articulating
link
outer boom
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.)
Withdrawn
Application number
EP94301603A
Other languages
English (en)
French (fr)
Other versions
EP0621227A3 (de
Inventor
Terry A. Stoychoff
Omar J. Fakhoury
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.)
Iowa Mold Tooling Co Inc
IOWA MOLD TOOLING CO
Original Assignee
Iowa Mold Tooling Co Inc
IOWA MOLD TOOLING CO
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 Iowa Mold Tooling Co Inc, IOWA MOLD TOOLING CO filed Critical Iowa Mold Tooling Co Inc
Publication of EP0621227A2 publication Critical patent/EP0621227A2/de
Publication of EP0621227A3 publication Critical patent/EP0621227A3/de
Withdrawn legal-status Critical Current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
    • B66C23/54—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 pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors

Definitions

  • This invention relates to articulating booms and more particularly to an articulating boom for loading logs.
  • Articulating booms usually consist of an inner and an outer boom. These booms are connected by a hydraulic cylinder which causes the outer boom to rotate with respect to the inner boom.
  • the inner boom is conventionally connected by a hydraulic cylinder to a base and is allowed to pivot with respect to the base by action of the hydraulic cylinder.
  • a grapple is typically located on the remote end of the outer boom. This allows the articulating boom to pick up and move heavy objects, such as logs, from one position to another. In a typical application, the articulating boom is used to load logs onto a truck for transportation and later to take the logs off the truck for delivery at a mill.
  • a typical prior art construction has a couple of problems.
  • the rotation between the upper boom and lower boom is limited to approximately 161° for a variety of reasons.
  • the pivot point of the two booms must be placed substantially below the centerline of the boom structure. This creates a more complex design.
  • Another problem of note is that the moment arm which can be applied to the outer boom is considerably less when the outer boom is fully retracted than when it is fully extended. This effectively limits the lifting capacity of the loader in certain configurations.
  • An exemplary embodiment of the invention achieves the foregoing object in a construction for an articulating boom that includes an inner boom, an outer boom near an end of the inner boom and a short link extending between the adjacent ends of the inner and outer booms.
  • a first pivot connects the link to an end of the inner boom and a second pivot spaced from the first pivot connects the link to the end of the outer boom.
  • a motor is located to interconnect the booms and is operable to effect relative movement between the booms.
  • the structure is completed by a synchronizing mechanism interconnecting the adjacent ends of the boom so that when the motor effects relative movement between the booms, the outer boom will swing about the adjacent end of the inner boom about the first and second pivots and the link will swing about the inner boom about the first pivot.
  • This construction increases the arc of relative movement between the inner and outer booms while maintaining an acceptable moment arm that provides good lifting capacity without requiring an overly large motor.
  • the structure is simple and therefore economically manufactured and maintained to promote long life.
  • the synchronizing mechanism is a set of mating gears.
  • the gears have equal pitches.
  • one of the gears is centered on the first pivot and the other of the gears is centered on the second pivot.
  • first and second pivots are on the centerlines of respective ones of the booms.
  • the outer boom has a grapple connected to a remote end thereof.
  • the motor is preferably a hydraulic cylinder.
  • an upright mast which has a post and a base.
  • the base is rotatable about the post in a horizontal plane through 360° so that the boom can be rotated through 360°.
  • the upright mast is located on a movable platform.
  • FIG. 1 shows one prior art design of an articulating log loader boom.
  • the inner boom 10 is connected to the outer boom 12 by side-by-side flanges 14 (only one of which is shown).
  • Each flange 14 mounts a pair of pivot pins 16,18.
  • the outer boom 12 and the inner boom 10 pivot relative to each other about the pin 16 while the pivot pin 18 is connected to the rod end 19 of a hydraulic cylinder 20.
  • the cylinder end 21 of the hydraulic cylinder 20 is pivotally connected to a pivot collar 22 on the inner boom 10 via a pivot pin 24.
  • Another hydraulic cylinder 27 (Fig.
  • dimension D1 shows the moment arm generated between the inner and outer booms 10 and 12 by the hydraulic cylinder 20 when the outer boom 12 is fully extended.
  • Dimension D2 shows the rather minuscule moment arm over which the hydraulic cylinder 20 operates when the outer boom 12 is fully retracted.
  • Fig. 2 illustrates one of the difficulties that arises from the limited relative motion attainable between the inner boom 10 and the outer boom 12 as mentioned previously. Because of the limited relative motion, the grapple 31 cannot be moved any closer to the base 30 than illustrated in Fig. 2, even when the outer boom 12 is fully retracted. Consequently, loading logs adjacent the base 30 is difficult.
  • FIGs. 3 and 4 One embodiment of the invention is illustrated in Figs. 3 and 4 and in the interest of brevity, identical, but primed, reference numerals are used on their counterparts heretofore described in connection with the description of the prior art.
  • the inner boom is 10' while the outer boom is 12', etc.
  • the inner boom 10' is connected to the outer boom 12' by a single link 32 on the centerlines of the boom.
  • the link has two spaced pivot pins 34 and 35.
  • the pivot pin 34 connects the link 32 to the outer boom 12 while the pivot pin 35 connects the link 32 to the inner boom 10'.
  • a pair of the links 32 can be employed, one on each side of the booms, with the pivot pins 34,35 extending through the two booms 10',12' and the two links 32.
  • the use of the links 32 allow movement of the outer boom from a position such as shown in Fig. 3 wherein the centerlines 36 and 37 of the inner and outer booms 10',12', respectively are geometrically congruent to one wherein they are almost parallel but spaced a distance approximately equal to the distance between the centerlines of the pivot pins 34,35.
  • a synchronizing means interconnects the adjacent end of the booms 10' and 12'.
  • the synchronizing mechanism is in the form of a pair of mating sector gears 39,40.
  • the sector gear 39 is a affixed to the outer end of the inner boom 10' while the sector gear 40 is affixed to the inner end of the outer boom 12'. That is to say, the sector gears 39 and 40 are affixed to adjacent ends of the inner and outer booms 10',12' and with their centers on the pivot pins 35 and 34 respectively.
  • the sector gear 40 includes a depending tongue 42 which captures a pivot pin 44.
  • the pivot pin 44 is connected to the rod end 19' of the hydraulic cylinder 20'.
  • the cylinder end 21' of the hydraulic cylinder 20' is connected to a pivot collar 22' by a pivot pin 24'.
  • the outer boom 12' pivots about the pivot axis defined by the pivot pin 34.
  • the pivot axis defined by the pivot pin 34 translates in an arc about the pivot axis defined by the pivot pin 35.
  • the sector gears 39 and 40 are of equal pitch diameter.
  • the links 32 will pivot 1° in the same direction. In some instances, however, it may be desirable to increase or decrease the rates of relative pivotal movement of the outer boom 12 and links 32 in which case, different pitch diameters for the sector gears 39,40 will be selected.f
  • the inner boom 10' is pivoted by a pivot pin 28' to an upright boom mast, generally designated 50.
  • the mast 50 includes a base 46 mounted on the upper end of a post 48.
  • the base 46 is journaled on the post 48 for rotation about a horizontal axis and in a horizontal plane through a full 360°.
  • a hydraulic motor (not shown) is typically employed to drive the base 46 about the aforementioned vertical axis.
  • the pivot collar 22' also mounts a pivot pin 26' which is connected to the rod end of a hydraulic cylinder 45.
  • the opposite end of the cylinder 45 is connected via a pivot pin 49 to the base 46. Consequently, the inner boom 10' may be elevated or lowered about the pivot pin 28' by appropriate operation of the cylinder 45.
  • the entire boom assembly, including the post 48 is mounted to the bed of a truck 52.
  • the spacing between the booms 10',12' provided by the links 32 between the pivot points 34 and 36 provide for greater rotation of the outer boom 12' relative to the inner boom 10', in the preferred embodiment 175° or more, than the prior art structure shown in Fig. 1.
  • the use of the links 32 allow the pivot pins 34 and 36, and the pivot axes defined thereby, to be located on the centerline of the inner boom 10, and 12, respectively. This provides a simpler design than in the prior art, allowing elimination of the flanges 14.
  • boom of the invention is not limited to log loading users but may find utility in other material handling operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP94301603A 1993-04-22 1994-03-07 Gelenkiger Ladearm für Baumstämme. Withdrawn EP0621227A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5146393A 1993-04-22 1993-04-22
US51463 1993-04-22

Publications (2)

Publication Number Publication Date
EP0621227A2 true EP0621227A2 (de) 1994-10-26
EP0621227A3 EP0621227A3 (de) 1994-12-28

Family

ID=21971454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94301603A Withdrawn EP0621227A3 (de) 1993-04-22 1994-03-07 Gelenkiger Ladearm für Baumstämme.

Country Status (4)

Country Link
EP (1) EP0621227A3 (de)
AU (1) AU665896B2 (de)
CA (1) CA2120219A1 (de)
NZ (1) NZ260020A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016046224A1 (de) * 2014-09-22 2016-03-31 Schwing Gmbh Knickmast

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122681B (de) * 1959-05-26 1962-01-25 Meiller Fahrzeuge Auslegerkran mit hydraulischem Antrieb, insbesondere fuer die Montage an Lastkraftwagen
US3032206A (en) * 1960-02-23 1962-05-01 Humboldt Company Mobilized lifting and loading boom
US3035722A (en) * 1959-09-01 1962-05-22 Carl H Anderson Vehicle loading device
FR2193776A1 (de) * 1972-07-26 1974-02-22 Outillage Nle S E Indle
FR2331511A1 (fr) * 1975-11-14 1977-06-10 Brun Jean Louis Dispositif de liaison de deux bras constitutifs d'un ensemble de levage
WO1992004515A1 (en) * 1990-08-30 1992-03-19 Up-Right, Inc. Platform leveling apparatus
EP0518569A2 (de) * 1991-06-06 1992-12-16 Alan Chadwick Gelenkarmsystem

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122681B (de) * 1959-05-26 1962-01-25 Meiller Fahrzeuge Auslegerkran mit hydraulischem Antrieb, insbesondere fuer die Montage an Lastkraftwagen
US3035722A (en) * 1959-09-01 1962-05-22 Carl H Anderson Vehicle loading device
US3032206A (en) * 1960-02-23 1962-05-01 Humboldt Company Mobilized lifting and loading boom
FR2193776A1 (de) * 1972-07-26 1974-02-22 Outillage Nle S E Indle
FR2331511A1 (fr) * 1975-11-14 1977-06-10 Brun Jean Louis Dispositif de liaison de deux bras constitutifs d'un ensemble de levage
WO1992004515A1 (en) * 1990-08-30 1992-03-19 Up-Right, Inc. Platform leveling apparatus
EP0518569A2 (de) * 1991-06-06 1992-12-16 Alan Chadwick Gelenkarmsystem

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016046224A1 (de) * 2014-09-22 2016-03-31 Schwing Gmbh Knickmast

Also Published As

Publication number Publication date
AU5771194A (en) 1994-10-27
NZ260020A (en) 1995-04-27
CA2120219A1 (en) 1994-10-23
AU665896B2 (en) 1996-01-18
EP0621227A3 (de) 1994-12-28

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