EP2197779A2 - Articulated mechanical arm - Google Patents
Articulated mechanical armInfo
- Publication number
- EP2197779A2 EP2197779A2 EP08789695A EP08789695A EP2197779A2 EP 2197779 A2 EP2197779 A2 EP 2197779A2 EP 08789695 A EP08789695 A EP 08789695A EP 08789695 A EP08789695 A EP 08789695A EP 2197779 A2 EP2197779 A2 EP 2197779A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- arm
- rigid sections
- rigid section
- rigid
- angle
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/301—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom with more than two arms (boom included), e.g. two-part boom with additional dipper-arm
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
Definitions
- This invention relates to an articulated mechanical arm. More particularly but not exclusively, it relates to an articulated mechanical arm having a large angular range of articulation. Even more particularly but not exclusively it relates to an articulated mechanical arm having an angular range of articulation suitable for use in underhead and overhead work.
- Mechanical arms are seen in wide use provided by a number of manufacturers for applications including digging.
- such mechanical arms utilise rigid beam sections connected to each other at pivot points.
- the rigid sections pivot in a vertical plane within an angular range less than a reflex angle.
- Such limited angular freedom of motion suits the application of such a mechanical arm for low level work such as digging.
- the use of such an arm for overhead work is limited due to restrictions placed upon the angular freedom of articulation of the arm by the design of the arm and the pivot points.
- Discrete pieces of equipment for example "cherry pickers" are used for overhead, high level working.
- a platform is elevated, typically using a scissor-like mechanism, or with rigid sections which pivot in a vertical plane with an angular range less than a reflex angle in order to provide a base from which work can be conducted.
- an articulated mechanical arm comprising: a plurality of rigid sections; at least two of the rigid sections being pivotable relative to each other, about a pivot point such that a fulcrum located at a proximal end of a second of the at least two rigid sections, adjacent the pivot point, can cross a longitudinal axis of a first of the at least two rigid sections.
- Such an articulated mechanical arm allows for operation both as a digger arm and as a "cherry picker” due to the range of movement of the first rigid section relative to the second rigid section.
- the arm can thus function as a mechanical digger or as a cherry picker with little more effort than swapping the digger bucket for a cherry picker platform.
- the mechanical arm when used on a vertical plane, would be suitable for both higher level (eg overhead) work as well as for lower level work (eg below head height).
- the angular range of the first and second rigid sections may range from an acute angle through an obtuse angle to a reflex angle.
- the working angle of operation between the adjacent first and second rigid sections may range from being an acute through an obtuse to a reflex angle in either direction.
- the articulated mechanical arm may comprise one or more hydraulic or pneumatic cylinders, the cylinders having a fulcrum centre which is arranged to load and/or move at least one of the plurality of a rigid sections to which it is pivotally connected relative to another of the plurality of rigid sections.
- the articulated mechanical arm may comprise a pivotal motion assistance mechanism, for example a ratchet clamp.
- the pivotal motion assistance mechanism may be arranged to assist relative pivotal movement of rigid sections independently of any other external object, for example the ground.
- the articulated mechanical arm may comprise actuators such as hydraulic cylinders or angular actuators such as hydraulic motors.
- the articulated mechanical arm may comprise fittings arranged to receive at least one attachment.
- the articulated mechanical arm may comprise a control mechanism arranged to control the orientation of the at least one attachment.
- the attachment may comprise at least one of the following: cherry picker platform, bucket, pneumatic or hydraulic drill, pneumatic or hydraulic hammer, pallet lifting forks, or a hedge or bush cutter.
- the articulated mechanical arm may comprise a mechanism for temporarily moving the fulcrum of a cylinder which would otherwise obstruct the movement of the rigid sections to a configuration suitable for overhead operation.
- the articulated arm may comprise a damping mechanism arranged to dampen gravity assisted movement of pivotally connected adjacent rigid sections.
- Figure 1 is a schematic representation of an articulated mechanical arm according to an aspect of the present invention shows a typical digging application comprising two rigid sections where the superior angle of operation ⁇ s and the inferior angle of operation ⁇ j are both defined by the relative angles of the axis 21 of the first rigid section 2 and the axis 22 of the second rigid section 3;
- Figure 2 is a plan view of a pivot region of the articulated mechanical arm of Figure 1 ;
- Figures 3 to 6 are representations of two rigid sections of the articulated mechanical arm of Figure 1 being configured for an overhead application;
- Figures 7 to 9 are representations illustrating the introduction into the articulated mechanical arm of a further rigid section so as to allow work at higher levels and at positions more distant to the support base;
- Figures 10 to 14 are cross-sectional side elevations of the pivot region of a second embodiment of an articulated arm according to an aspect of the present invention.
- Figure 15 is a schematic diagram showing the first section 2 and second section 3 of the arm 1 in figure 1 , in alternate configurations.
- an articulated mechanical arm 1 comprises first rigid section 2 and second rigid section 3, a pivot 4, a hydraulic ram 5 and a base 6;
- the base 6 comprises a mechanical digger, a tractor, or any suitable vehicle, for example a four wheel drive, all terrain vehicle.
- the present embodiment comprises an attachment in the form of bucket 7 for digging purposes.
- the inferior angle of operation ⁇ j is less than 180 degrees and the articulated mechanical arm 1 operates in the manner of a standard digger arm where the fulcrum 20 of the ram 5 operates exclusively within the superior angle of operation ⁇ s and does not intersect the axis 21 of the first rigid section 2.
- the first rigid section 2 has a recess 8 extending partway along its longitudinal axis from the pivot 4 so as to define a substantially U-shaped channel therein.
- the recess 8 allows part, or all of, the ram 5 to pass from one side of the first rigid section 2 to the other. This, changes the point of action of the fulcrum 20 of the ram 5 from the superior angle ⁇ s of operation to the inferior angle of operation ⁇ j.
- the second rigid section 3 pivots with respect to the first rigid section such that the inferior angle of operation ⁇ j can be a reflex angle. This allows the use of the arm 1 for high level applications for example as a "cherry picker", with the fitting of a suitable platform 9.
- the drawings represent the sequence of events to raise the cherry picker platform from ground level upwards.
- the downward load is maintained such that the longitudinal axis of the second rigid section 3 passes overcentre of the pivot 4.
- the longitudinal axis of the second rigid section 3 crosses or intersects the longitudinal axis of the first rigid section 2 so that the fulcrum 20 now operates in the inferior angle of operation ⁇ j.
- the ram 5 extends further such that second rigid section 3 rotates further about the pivot 4 and the superior angle of operation ⁇ s reduces accordingly, such that it may become an acute angle.
- an additional rigid section 11 allows operation of the arm 1 such that the platform 9 can be at even a higher level or at a position more distant from the support base 6.
- the extra section allows the platform 9 to remain upright even at ground level and a control mechanism 12 maintains the platform 9 level in operation.
- first rigid section 2 and second rigid section 3 are used for the convenience of describing their relationship to one another and do not reflect their positions in a plurality of rigid sections.
- Figures 10 to 14 show a second embodiment of an articulated arm subsection that is substantially the same as that of Figure 1. Accordingly, similar parts are accorded the same reference numerals.
- the arm 1 comprises an additional ram 13 and a cam 14.
- the cam 14 is rotatably linked to the additional ram 13, the pivot 15, the first rigid section 2 and the ram 5.
- Extension of additional ram 13 changes the position of the pivot 15 of the ram 5 from its position within the superior angle of operation ⁇ s to a position within the inferior angle of ⁇ j through actuating rotation of the cam 14.
- a ratchet 16 maintains the second rigid section 3 in the overcentre position until released.
- the additional ram 13 retracts to reverse the rotation of the cam 14 to return the anchor pivot 15 of the ram 5 to its original position within the superior angle of operation ⁇ s .
- Extension of the ram 5 now rotates the second rigid section 3 in a direction to further reduce the superior angle ⁇ s while the ratchet 16 offers minimal resistance. - S -
- this mechanism When this mechanism in its original position it can be used to prevent either unwanted downward or unwanted upward overcentring of the second rigid section 3.
- the prevention of unwanted downward overcentring of the arm 1 is important when the arm 1 is operating in the superior angle of operations, for example as a cherry picker.
- the prevention of unwanted upward overcentring of the arm 1 is important when the arm is operating in the inferior angle of operation, for example digging, where the mechanism limits the inferior angle of operation to less than 180 degrees.
- Such an arrangement allows the overcentring of the second rigid section 3 with respect to the first rigid section 2 without the use of the ground or other external body as a counterload.
- any suitable mechanism may be employed in order to limit either of the superior, or the inferior, angles of operation to less than 180 degrees.
- the second rigid section of the arm may be mounted alongside, externally, of the first rigid section. This obviates the requirement for the provision of a recess in the first rigid section to allow passage of the proximal end and fulcrum of the second rigid section overcentre.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES20070639 IES20070639A2 (en) | 2007-09-07 | 2007-09-07 | Articulated mechanical arm |
PCT/IE2008/000084 WO2009031131A2 (en) | 2007-09-07 | 2008-09-03 | Articulated mechanical arm |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2197779A2 true EP2197779A2 (en) | 2010-06-23 |
EP2197779B1 EP2197779B1 (en) | 2016-04-20 |
Family
ID=40404239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08789695.7A Active EP2197779B1 (en) | 2007-09-07 | 2008-09-03 | Articulated mechanical arm |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2197779B1 (en) |
IE (1) | IES20070639A2 (en) |
WO (1) | WO2009031131A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012135934A2 (en) * | 2011-04-04 | 2012-10-11 | Vehicules Inpak Inc./Inpak Vehicles Inc. | A vehicle-mounted articulated arm for discharging bins |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1102366B (en) * | 1959-07-03 | 1961-03-16 | Focke Wulf Ges Mit Beschraenkt | Height-adjustable work platform with articulated mast |
US4461369A (en) * | 1981-03-30 | 1984-07-24 | Amador Hydraulic Services Limited | Articulated boom and assembly therefor |
SE456575B (en) * | 1985-04-25 | 1988-10-17 | Hiab Foco Ab | CRAN OUR VIPPARM IS TURNABLE RELATIVELY THE MAIN ARM THROUGH A LINKING SYSTEM |
FR2600634B1 (en) * | 1986-06-24 | 1988-09-23 | Guilhem Claire | DEVICE FOR CONTROLLING THE ARTICULATION OF TWO ARMS OF AN E NGIN |
SE466911B (en) * | 1990-08-29 | 1992-04-27 | Hiab Ab | VIPPARMSKRAN |
EP1770050B1 (en) * | 2005-09-29 | 2009-12-23 | Steindl Krantechnik Ges.m.b.H | Foldable crane |
-
2007
- 2007-09-07 IE IES20070639 patent/IES20070639A2/en not_active IP Right Cessation
-
2008
- 2008-09-03 EP EP08789695.7A patent/EP2197779B1/en active Active
- 2008-09-03 WO PCT/IE2008/000084 patent/WO2009031131A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009031131A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009031131A2 (en) | 2009-03-12 |
WO2009031131A3 (en) | 2009-06-25 |
EP2197779B1 (en) | 2016-04-20 |
IES20070639A2 (en) | 2011-02-16 |
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