US3902295A - Boom construction and method for making same - Google Patents
Boom construction and method for making same Download PDFInfo
- Publication number
- US3902295A US3902295A US472965A US47296574A US3902295A US 3902295 A US3902295 A US 3902295A US 472965 A US472965 A US 472965A US 47296574 A US47296574 A US 47296574A US 3902295 A US3902295 A US 3902295A
- Authority
- US
- United States
- Prior art keywords
- boom
- plate
- weld
- plates
- castings
- 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
Links
Images
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
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
-
- 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
- E02F3/32—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 working downwardly and towards the machine, e.g. with backhoes
Definitions
- An excavator boom has attachment means formed on opposite ends thereof for attachment to a vehicle and to a work implement.
- the boom comprises a pair of continuous and uninterrupted upper and lower plates and a pair of side plates, all secured together by four continuous welds to form a box section throughout the length of the boom.
- the boom is generally V-shaped and has a third attachment means formed at the apex thereof.
- the various plates and attachment means are positioned in suitably arranged fixtures and are tack Welded together. The boom is then placed on each of its sides for final welding purposes.
- An object of this invention is to provide a boom construction which exhibits a high degree of structural integrity and an economical method for expeditiously making the same.
- the boom comprises attachment means formed on opposite ends thereof, a pair of continuous and uninterrupted upper and lower plates and side plates secured to the upper and lower plates by four continuous weld means extending substantially the full length ofthe boom.
- the boom is fabricated by positioning the various plates and attachment means in suitably arranged gigs and fixtures and by initially tack welding them together. The boom is then laid on each of its sides for the final welding operation.
- FIG. I is aside elevational view of a hydraulic excavator employing a boom of this invention thereon;
- FIG. 2 is an enlarged. side elevational view of the boom
- FIG. 3 is an enlarged sectional view taken in the direction of arrows IIIIII in FIG. 2;
- FIG. 4 is an enlarged sectional view taken in the direction of arrows IVIV in FIG. 2;
- FIG. 5 is a view similar to FIG. 4 but illustrating a prior art weldment
- FIG. 6 is an enlarged cross sectional view taken in the direction of arrows VIVI in FIG. 2;
- FIG. 7 is a view similar to FIG. 3 but showing attachment structure exploded with the welds removed there from;
- FIG. 8 is an enlarged top plan view of one end of the boom. taken in the direction of arrows VIIIVIII in FIG. 2.
- FIG. I illustrates a hydraulic excavator 10 having a first end of a boom ll of this invention pivotally mounted thereon by a first pivot means 12.
- the second end of the boom is attached to a work implement. such as a bucket I3, by a second pivot means 14 and intermediate stick 15.
- the boom is generally V-shapcd and has a pair of first double-acting hydraulic cylinders 16 (one shown) each attached to an apex thereof by a third pivot means 17.
- the head end of the cylinders are each pivotally attached on the vehicle by a fourth pivot means 18 to fa.- cilitate raising or lowering of the boom under control of the operator.
- a second double-acting hydraulic cylinder 19 has its head end mounted on an upper side of the boom by a fifth pivot means 20 and its rod end is attached to the upper end of stick 15 by a sixth pivot means 21.
- a third double-acting hydraulic cylinder 22 is pivotally interconnected between an upper end of stick I5 and bucket 13, through suitable linkage means 23, to selectively pivot the bucket on the stick.
- boom 11 comprises a pair of continuous and uninterrupted upper and lower plates 24 and 25, respectively, and a pair of side plates 26 se cured thereto.
- the structurally integrated plates form a box section substantially throughout the full length of the boom.
- Each side plate 26 comprises a pair of plates 26 and 27 secured together at a transverse weld 28 (FIG. 3).
- the weld is backed-up throughout its length by a flat member 29 disposed interiorly of the boom.
- the booms structural integrity is not adversely affected by such a weld.
- the major stresses imposed on the boom during operation thereof occur adjacent to its apex, at attachment means 17 (FIG. I).
- each plate 26 may have a thickness T (e.g., I in.) which is greater than the thickness T (e.g., in.) of each plate 27.
- the forward end of each plate 26 is preferably machined to form a taper throughout a forward portion L of its length to match the thickness of a respective, co-planar plate 27. Such a construction substantially reduces the overall weight of the boom without adversely affecting its bending strength.
- each weld means 30 has a generally V-shaped cross section terminating at an apex thereof at an L- shaped angle bar 31 which functions as a back-up means for the weld.
- FIG. 5 illustrates a prior art weldment wherein a pair of plates 25' and 26' are secured together by a weld 30' which terminates at its apex at a rolled section 31 formed on plate 25'.
- angle bar 31 (FIG. 4) can be suitably sized and positioned to provide a zero clearance between the angle bar and side plate 26 and a precisely controlled clearance C at the apex or root of weld 30 to assure the formation of structurally sound weldments.
- pivot means 17 comprises an attachment means including a pair of bell castings32 each extending through an annular opening 33 formed through a respective side plate 26 and secured thereto by an annular weld 34.
- An annular first flange 35 is formed on each bell casting to extend radially outwardly therefrom to abut inner surface portions of plate 26 to precisely position the bell casting thereon and to also provide a weld back-up means thereat for weld 34.
- An annular second flange 36 extends axially inwardly from each bell casting to underlie a respective end of an intermediate cylindrical connecting member 37.
- a pair of annular welds 38 secure the opposite ends of the connecting member to the bell castings.
- first pivot means 12 comprises an attachment means or yoke at the first end of the boom having a pair of bearing bushings 39 secured thereon for pivotally mounting the boom on the frame of vehicle 10.
- second pivot means 14 comprises an attachment means or casting 40 welded on the second or forward end of the boom for pivotal attachment to stick is.
- fifth pivot means comprises an attachment means or casting 41 secured on upper plate 24 for pivotally attaching the head end of cylinder 19 thereon.
- METHOD OF FABRICATION Boom I1 is fabricated by first flame cutting and shaping upper, lower and side plates 2426. Openings 33 (FIG. 7) are formed through the side plates and eastings 32 and member 37, presecured together by welds 38, are suitably mounted therein. The vertical legs of preshaped angle bars 31 are then tack welded to the side plates in a suitable fixture whereby each leg projects slightly beyond a lateral end of a side plate to precisely set clearance C (FIG. 4) for subsequent formation of the weld grooves for welds 30.
- Lower plate is then mounted in a suitable fixture, in its FIG. 2 position.
- the side plates, having castings 32 and member 37 tack welded thereto, are then accurately positioned on the bottom plate 25 and tack welded thereto.
- Top plate 24 is then positioned on the side plates and tack welded thereto along with castings 32 and 4] and bushings 39.
- the tack welded sub-assembly is then turned on a first side thereof to complete the exposed major welds, including a weld 34 and two of the four continuous welds securing the upper, lower and side plates together.
- the boom is then turned over onto its second. opposite side and a similar welding operation is effected thereon to complete the major welds.
- the boom is then mounted on excavator 10 (FIG. 1) and attached to the various cylinders and stick 15.
- a generally Vshaped boom comprising attachment means on a first end of said boom Ill adapted for attachment on a vehicle.
- four continuous weld means each securing a lateral side of each one of said upper and lower plates to a respective one of said side plates and second attachment means disposed at an apex of said boom comprising a pair of annular castings each disposed in an opening formed through a respective side plate and an intermediate cylindrical conneeting member secured between said castings.
- attachment means pivotally mounts said boom on a frame of an excavator and further comprising another attachment means on a second, opposite end of said boom pivotally attached to a work implement.
- the boom of claim 1 further comprising an L- shaped angle bar disposed interiorly of said boom and secured to each of said weld means at an apex thereof. said weld means and a respective angle bar being coterminus at least substantially throughout the length of said boom.
- each of said side plates comprises first and second co-planar plates and a weld, disposed transversely relative to said side plates, securing said first and second plates together.
- the boom of claim 4 further comprising a flat back-up member secured to said weld and abutting said first and second plates, interiorly of said boom.
- the boom of claim 1 further comprising an annular first flange formed on each of said castings to extend radially outwardly therefrom to abut inner surface portions of a respective side plate.
- the boom of claim 7 further comprising an annular second flange formed on each of said castings to extend axially inwardly to underlie a respective end of said connecting member and an annular weld securing each of said castings to a respective end of said connecting member at said second flange.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Component Parts Of Construction Machinery (AREA)
- Body Structure For Vehicles (AREA)
- Jib Cranes (AREA)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US472965A US3902295A (en) | 1974-05-28 | 1974-05-28 | Boom construction and method for making same |
CA221,235A CA1014113A (en) | 1974-05-28 | 1975-03-04 | Boom construction and method for making same |
BR2354/75A BR7501842A (pt) | 1974-05-28 | 1975-03-26 | Haste movel para escavadoras e processo para a sua fabricacao |
BE155586A BE828157A (fr) | 1974-05-28 | 1975-04-21 | Construction de fleche et procede pour la fabriquer |
US05/570,985 US4034876A (en) | 1974-05-28 | 1975-04-23 | Boom construction and method for making same |
JP50052128A JPS5812423B2 (ja) | 1974-05-28 | 1975-05-01 | ブ−ムコウゾウ オヨビ ソノセイゾウホウホウ |
DE2521805A DE2521805C2 (de) | 1974-05-28 | 1975-05-16 | Hydraulikbagger mit einem stumpfwinkligen Ausleger |
FR7515945A FR2273121B1 (pt) | 1974-05-28 | 1975-05-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US472965A US3902295A (en) | 1974-05-28 | 1974-05-28 | Boom construction and method for making same |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/570,985 Division US4034876A (en) | 1974-05-28 | 1975-04-23 | Boom construction and method for making same |
Publications (1)
Publication Number | Publication Date |
---|---|
US3902295A true US3902295A (en) | 1975-09-02 |
Family
ID=23877620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US472965A Expired - Lifetime US3902295A (en) | 1974-05-28 | 1974-05-28 | Boom construction and method for making same |
Country Status (7)
Country | Link |
---|---|
US (1) | US3902295A (pt) |
JP (1) | JPS5812423B2 (pt) |
BE (1) | BE828157A (pt) |
BR (1) | BR7501842A (pt) |
CA (1) | CA1014113A (pt) |
DE (1) | DE2521805C2 (pt) |
FR (1) | FR2273121B1 (pt) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4069637A (en) * | 1976-08-09 | 1978-01-24 | Caterpillar Tractor Co. | Tubular section boom |
WO1980000857A1 (en) * | 1978-10-12 | 1980-05-01 | Int Harvester Co | Boom arm with rock deflection feature |
US4997333A (en) * | 1989-11-22 | 1991-03-05 | Ford New Holland, Inc. | Backhoe boom lock |
US5015148A (en) * | 1989-01-23 | 1991-05-14 | Ford New Holland, Inc. | Loader mounting frame |
DE3938835A1 (de) * | 1989-11-23 | 1991-05-29 | Sued Chemie Ag | Verfahren zur oxidation von organischen verunreinigungen in abwaessern |
US5088881A (en) * | 1989-11-22 | 1992-02-18 | Ford New Holland, Inc. | Tapered pin mounting for loaders |
US5111578A (en) * | 1989-11-22 | 1992-05-12 | Ford New Holland, Inc. | Method of manufacturing a backhoe boom |
US5125787A (en) * | 1989-11-22 | 1992-06-30 | Ford New Holland, Inc. | Backhoe boom construction |
US5269061A (en) * | 1992-02-28 | 1993-12-14 | Dresser Industries, Inc. | Method for forming structural unit |
US5746861A (en) * | 1996-09-06 | 1998-05-05 | Caterpillar Inc. | Method of manufacturing a structural portion of a construction machine |
USD410471S (en) * | 1997-06-06 | 1999-06-01 | Hitachi Construction Machinery Co., Ltd. | Large-sized excavator |
US5984618A (en) * | 1997-06-30 | 1999-11-16 | Caterpillar Inc. | Box boom loader mechanism |
US5993139A (en) * | 1997-06-30 | 1999-11-30 | Caterpillar Inc. | Box boom lift arm assembly |
US20030118433A1 (en) * | 2001-12-20 | 2003-06-26 | Janes Brian R. | Load bearing member arrangement and method |
US20040191043A1 (en) * | 2003-03-31 | 2004-09-30 | Davis Jeremy D. | Structural member of a work machine |
US20050204590A1 (en) * | 2004-03-22 | 2005-09-22 | Yoshiyuki Takano | Construction machine |
US20090223093A1 (en) * | 2006-02-09 | 2009-09-10 | Bernhard Willaredt | Support Arm for a Work Machine |
US20130223967A1 (en) * | 2010-11-05 | 2013-08-29 | Hitachi Construction Machinery Co., Ltd. | Working Machine |
US20130343854A1 (en) * | 2011-05-19 | 2013-12-26 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machine |
WO2014029516A1 (de) * | 2012-08-24 | 2014-02-27 | Putzmeister Engineering Gmbh | Mastarm für einen betonverteilermast |
EP2711466A1 (en) * | 2011-05-19 | 2014-03-26 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machinery |
JP2015178744A (ja) * | 2014-03-19 | 2015-10-08 | コベルコ建機株式会社 | 溶接構造物及び建設機械 |
JP2016089375A (ja) * | 2014-10-30 | 2016-05-23 | 日立建機株式会社 | 建設機械用ブーム |
US9719242B2 (en) | 2015-09-18 | 2017-08-01 | Caterpillar Inc. | Node for a space frame |
US9739030B1 (en) * | 2015-09-24 | 2017-08-22 | Emery J. Sova | Excavator operator compartment between two booms |
US20180202125A1 (en) * | 2016-12-16 | 2018-07-19 | J.C. Bamford Excavators Limited | Arm Assembly |
US10428489B2 (en) * | 2014-11-06 | 2019-10-01 | Kobelco Construction Machinery Co., Ltd. | Arm for construction machine |
US11225770B2 (en) * | 2017-09-25 | 2022-01-18 | Hitachi Construction Machinery Co., Ltd. | Work arm of work machine |
WO2023049428A1 (en) | 2021-09-27 | 2023-03-30 | Caterpillar Inc. | Boom assembly |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2445481A1 (fr) * | 1978-12-29 | 1980-07-25 | Poclain Sa | Structure mecano-soudee d'un bras de force |
JPS58104493U (ja) * | 1982-01-12 | 1983-07-15 | マックス株式会社 | 空気タンク用ドレン装置 |
JPS58180947U (ja) * | 1982-05-29 | 1983-12-02 | 日立建機株式会社 | 油圧シヨベルのフロント構造 |
JPS6195917A (ja) * | 1984-10-17 | 1986-05-14 | Yukiaki Suzuki | 合成樹脂体の成形方法及びこの方法に用いる合成樹脂成形用金型 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1974458A (en) * | 1932-10-19 | 1934-09-25 | Gen Steel Castings Corp | Dipper handle |
US2243965A (en) * | 1940-03-20 | 1941-06-03 | Pettibone Mullken Corp | Dipper |
US2610754A (en) * | 1949-10-20 | 1952-09-16 | Leo A Inskeep | Dipper handle |
US2652940A (en) * | 1950-08-24 | 1953-09-22 | Northwest Engineering Corp | Excavating dipper |
US2910190A (en) * | 1955-09-07 | 1959-10-27 | Baas Erwin | Boom arm |
US2972425A (en) * | 1959-01-14 | 1961-02-21 | James O Anderson | Trench hoe dipper |
US3139201A (en) * | 1962-05-28 | 1964-06-30 | Rolfes August | Front end loader scoop for handling potatoes and the like in the bulk |
US3254780A (en) * | 1964-09-24 | 1966-06-07 | Deere & Co | Lift arm structure for power loaders |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1178100A (fr) * | 1957-07-02 | 1959-05-04 | Faucheux Ets | Chargeur hydraulique adaptable aux tracteurs |
DE1843992U (de) * | 1961-10-11 | 1961-12-21 | Lidio Gherner | Bagger mit ausleger und greifkuebel. |
US3298548A (en) * | 1965-10-29 | 1967-01-17 | Case Co J I | Extensible back hoe assembly |
US3589539A (en) * | 1969-06-27 | 1971-06-29 | Hein Werner Corp | Backhoe having an articulated gooseneck boom |
JPS5151687Y2 (pt) * | 1972-06-20 | 1976-12-10 |
-
1974
- 1974-05-28 US US472965A patent/US3902295A/en not_active Expired - Lifetime
-
1975
- 1975-03-04 CA CA221,235A patent/CA1014113A/en not_active Expired
- 1975-03-26 BR BR2354/75A patent/BR7501842A/pt unknown
- 1975-04-21 BE BE155586A patent/BE828157A/xx not_active IP Right Cessation
- 1975-05-01 JP JP50052128A patent/JPS5812423B2/ja not_active Expired
- 1975-05-16 DE DE2521805A patent/DE2521805C2/de not_active Expired
- 1975-05-22 FR FR7515945A patent/FR2273121B1/fr not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1974458A (en) * | 1932-10-19 | 1934-09-25 | Gen Steel Castings Corp | Dipper handle |
US2243965A (en) * | 1940-03-20 | 1941-06-03 | Pettibone Mullken Corp | Dipper |
US2610754A (en) * | 1949-10-20 | 1952-09-16 | Leo A Inskeep | Dipper handle |
US2652940A (en) * | 1950-08-24 | 1953-09-22 | Northwest Engineering Corp | Excavating dipper |
US2910190A (en) * | 1955-09-07 | 1959-10-27 | Baas Erwin | Boom arm |
US2972425A (en) * | 1959-01-14 | 1961-02-21 | James O Anderson | Trench hoe dipper |
US3139201A (en) * | 1962-05-28 | 1964-06-30 | Rolfes August | Front end loader scoop for handling potatoes and the like in the bulk |
US3254780A (en) * | 1964-09-24 | 1966-06-07 | Deere & Co | Lift arm structure for power loaders |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4159796A (en) * | 1976-08-09 | 1979-07-03 | Caterpillar Tractor Co. | Method for making a boom |
US4069637A (en) * | 1976-08-09 | 1978-01-24 | Caterpillar Tractor Co. | Tubular section boom |
WO1980000857A1 (en) * | 1978-10-12 | 1980-05-01 | Int Harvester Co | Boom arm with rock deflection feature |
US5015148A (en) * | 1989-01-23 | 1991-05-14 | Ford New Holland, Inc. | Loader mounting frame |
US5088881A (en) * | 1989-11-22 | 1992-02-18 | Ford New Holland, Inc. | Tapered pin mounting for loaders |
US4997333A (en) * | 1989-11-22 | 1991-03-05 | Ford New Holland, Inc. | Backhoe boom lock |
US5111578A (en) * | 1989-11-22 | 1992-05-12 | Ford New Holland, Inc. | Method of manufacturing a backhoe boom |
US5125787A (en) * | 1989-11-22 | 1992-06-30 | Ford New Holland, Inc. | Backhoe boom construction |
DE3938835A1 (de) * | 1989-11-23 | 1991-05-29 | Sued Chemie Ag | Verfahren zur oxidation von organischen verunreinigungen in abwaessern |
US5269061A (en) * | 1992-02-28 | 1993-12-14 | Dresser Industries, Inc. | Method for forming structural unit |
US5746861A (en) * | 1996-09-06 | 1998-05-05 | Caterpillar Inc. | Method of manufacturing a structural portion of a construction machine |
USD410471S (en) * | 1997-06-06 | 1999-06-01 | Hitachi Construction Machinery Co., Ltd. | Large-sized excavator |
US5984618A (en) * | 1997-06-30 | 1999-11-16 | Caterpillar Inc. | Box boom loader mechanism |
US5993139A (en) * | 1997-06-30 | 1999-11-30 | Caterpillar Inc. | Box boom lift arm assembly |
US7165929B2 (en) * | 2001-12-20 | 2007-01-23 | Caterpillar Inc | Load bearing member arrangement and method |
US20060251503A1 (en) * | 2001-12-20 | 2006-11-09 | Caterpillar Inc. | Load bearing member arrangement and method |
US20030118433A1 (en) * | 2001-12-20 | 2003-06-26 | Janes Brian R. | Load bearing member arrangement and method |
US20040191043A1 (en) * | 2003-03-31 | 2004-09-30 | Davis Jeremy D. | Structural member of a work machine |
US20050204590A1 (en) * | 2004-03-22 | 2005-09-22 | Yoshiyuki Takano | Construction machine |
US20090223093A1 (en) * | 2006-02-09 | 2009-09-10 | Bernhard Willaredt | Support Arm for a Work Machine |
US20130223967A1 (en) * | 2010-11-05 | 2013-08-29 | Hitachi Construction Machinery Co., Ltd. | Working Machine |
EP2711466A4 (en) * | 2011-05-19 | 2015-05-20 | Hitachi Construction Machinery | ARM FOR CONSTRUCTION MACHINES |
US9315966B2 (en) * | 2011-05-19 | 2016-04-19 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machine with upper ends of rear plate protruding upward |
EP2711466A1 (en) * | 2011-05-19 | 2014-03-26 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machinery |
EP2711467A4 (en) * | 2011-05-19 | 2015-03-11 | Hitachi Construction Machinery | ARM FOR CONSTRUCTION MACHINE |
US20130343854A1 (en) * | 2011-05-19 | 2013-12-26 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machine |
US9255378B2 (en) | 2011-05-19 | 2016-02-09 | Hitachi Construction Machinery Co., Ltd. | Arm for construction machine |
WO2014029516A1 (de) * | 2012-08-24 | 2014-02-27 | Putzmeister Engineering Gmbh | Mastarm für einen betonverteilermast |
JP2015178744A (ja) * | 2014-03-19 | 2015-10-08 | コベルコ建機株式会社 | 溶接構造物及び建設機械 |
JP2016089375A (ja) * | 2014-10-30 | 2016-05-23 | 日立建機株式会社 | 建設機械用ブーム |
US10428489B2 (en) * | 2014-11-06 | 2019-10-01 | Kobelco Construction Machinery Co., Ltd. | Arm for construction machine |
US9719242B2 (en) | 2015-09-18 | 2017-08-01 | Caterpillar Inc. | Node for a space frame |
US9739030B1 (en) * | 2015-09-24 | 2017-08-22 | Emery J. Sova | Excavator operator compartment between two booms |
US20180202125A1 (en) * | 2016-12-16 | 2018-07-19 | J.C. Bamford Excavators Limited | Arm Assembly |
US10815637B2 (en) * | 2016-12-16 | 2020-10-27 | J.C. Bamford Excavators Limited | Arm assembly |
US11225770B2 (en) * | 2017-09-25 | 2022-01-18 | Hitachi Construction Machinery Co., Ltd. | Work arm of work machine |
WO2023049428A1 (en) | 2021-09-27 | 2023-03-30 | Caterpillar Inc. | Boom assembly |
Also Published As
Publication number | Publication date |
---|---|
JPS5812423B2 (ja) | 1983-03-08 |
BE828157A (fr) | 1975-10-21 |
JPS50153403A (pt) | 1975-12-10 |
CA1014113A (en) | 1977-07-19 |
DE2521805C2 (de) | 1984-10-31 |
FR2273121A1 (pt) | 1975-12-26 |
DE2521805A1 (de) | 1975-12-18 |
BR7501842A (pt) | 1976-04-20 |
FR2273121B1 (pt) | 1982-05-21 |
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