US20230081760A1 - Work machine - Google Patents

Work machine Download PDF

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Publication number
US20230081760A1
US20230081760A1 US17/802,159 US202117802159A US2023081760A1 US 20230081760 A1 US20230081760 A1 US 20230081760A1 US 202117802159 A US202117802159 A US 202117802159A US 2023081760 A1 US2023081760 A1 US 2023081760A1
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US
United States
Prior art keywords
arm
link rod
pin
hydraulic cylinder
attachment
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.)
Pending
Application number
US17/802,159
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English (en)
Inventor
Daisuke KUMATA
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD. reassignment HITACHI CONSTRUCTION MACHINERY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUMATA, Daisuke
Publication of US20230081760A1 publication Critical patent/US20230081760A1/en
Pending legal-status Critical Current

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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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • 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
    • E02F3/308—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 outwardly
    • 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
    • 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
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • 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
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/425—Drive systems for dipper-arms, backhoes or the like
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings
    • E04G23/082—Wrecking of buildings using shears, breakers, jaws and the like
    • 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
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
    • E02F3/3681—Rotators
    • 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
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/401—Buckets or forks comprising, for example, shock absorbers, supports or load striking scrapers to prevent overload

Definitions

  • the present invention relates to a work machine equipped with a heavy attachment.
  • a hydraulic excavator comprising a boom supported on an upper structure so as to be raised and lowered, an arm rotatably supported at the distal end of the boom, and an attachment (for example, bucket) rotatably supported at the distal end of the arm (for example, see Patent Literature 1).
  • the attachment operates in the gravity direction in accordance with the extension of a hydraulic cylinder supported on the back of the arm, and operates in the direction opposite to the gravity direction in accordance with the contraction of the hydraulic cylinder.
  • an object of the present invention is to provide a work machine capable of rotating an attachment while appropriately supporting a load applied to the attachment.
  • the present invention provides a work machine comprising: an undercarriage; an upperstructure supported on the undercarriage so as to turn thereon; a front working device including a boom supported on the upperstructure so as to be raised and lowered, an arm rotatably supported at a distal end of the boom, and an attachment rotatably supported at a distal end of the arm, wherein the arm includes: a pair of side surfaces that faces each other in a width direction of the front working device; and a body side surface and a back side surface that face each other in a direction perpendicular to the width direction of the front working device, each of which is connected to ends of the pair of side surfaces, the front working device includes: a hydraulic cylinder that is attached to the body side surface of the arm, and is supplied with and discharges hydraulic oil to extend and contract; and a link mechanism configured to cause the attachment to dump when the hydraulic cylinder extends and cause the attachment to crowd when the hydraulic cylinder contracts, the linkage mechanism includes: a first link
  • FIG. 1 is a side view of a work machine according to the present invention.
  • FIG. 2 is a perspective view of an arm and cutter.
  • FIG. 3 illustrates an attitude of the cutter when a hydraulic cylinder contracts.
  • FIG. 4 illustrates an attitude of the cutter when the hydraulic cylinder extends.
  • FIG. 1 is a side view of a work machine 1 according to the present invention.
  • the front, rear, left, and right are refereed based on the viewpoint of an operator who boards and operates the work machine 1 unless otherwise noted.
  • the work machine 1 includes an undercarriage 2 and an upperstructure 3 supported on the undercarriage 2 .
  • the undercarriage 2 includes a pair of left and right crawlers 8 .
  • a traveling motor not illustrated
  • the pair of left and right crawlers 8 rotates in accordance therewith, whereby the work machine 1 can travel.
  • the undercarriage 2 may be a wheel-mounted type undercarriage instead of including the crawlers 8 .
  • the upperstructure 3 is supported on the undercarriage 2 so as to turn thereon.
  • the upperstructure 3 mainly includes a turn frame 5 serving as a base, a cab (operator's seat) 7 arranged at the front left side of the turn frame 5 , a front working device 10 mounted at the center of the front end of the turn frame 5 so as to rotate in the vertical direction, and a counterweight 6 arranged at the rear of the turn frame 5 to balance the weight between the front working device 10 and the upperstructure 3 .
  • cab 7 In the cab 7 , an internal space where an operator who operates the working machine 1 boards is formed. Inside the cab 7 , a seat (not illustrated) on which the operator sits and operation devices (steering, pedal, lever, switch, etc.) which are operated by the operator sitting on the seat are arranged. The operator who is boarding the cab 7 operates the operation devices, whereby the undercarriage 2 travels, the upperstructure 3 turns, and the front working device 10 operates.
  • operation devices steering, pedal, lever, switch, etc.
  • the front working device 10 includes a boom 11 supported on the upperstructure 3 so as to be raised and lowered, an arm 12 rotatably supported at the distal end of the boom 11 , a cutter (attachment) 13 rotatably supported at the distal end of the arm 12 , hydraulic cylinders 14 , 15 , 16 for driving the boom 11 , the arm 12 , and the cutter 13 , a link mechanism 17 , and a stopper 18 (see FIG. 2 ).
  • the arm 12 has a body side surface 12 a , a back side surface 12 b , a left side surface 12 c (side surface), and a right side surface (not illustrated).
  • the body side surface 12 a and the back side surface 12 b face each other in a direction perpendicular to the lateral direction (width direction of the front working device 10 ).
  • the left side surface 12 c and the right side surface face each other in the lateral direction.
  • Each of the body side surface 12 a and the back side surface 12 b is connected to the end portions of the left side surface 12 c and right side surface.
  • the work machine 1 equipped with the cutter 13 works with the distal end of the arm 12 positioned forward of the distal end of the boom 11 (that is, with the body side surface 12 a facing downward and the back side surface 12 b facing upward).
  • the cutter 13 is one of the examples of a demolition attachment designed to grasp and destroy an object (for example, buildings). As described later, the cutter 13 has the number of components, and also includes hydraulic actuators (a turn motor 13 b , hydraulic cylinders 13 e , 13 f ), and thus the cutter 13 is heavier than other attachments such as a bucket.
  • the cutter 13 mainly includes a mounting bracket 13 a , the turn motor 13 b , a pair of blades 13 c , 13 d , and a pair of hydraulic cylinders 13 e , 13 f.
  • the mounting bracket 13 a is rotatably supported at the distal end of the arm 12 via a pin 13 g extending in the lateral direction (width direction of the front working device 10 ). Furthermore, the mounting bracket 13 a is rotatably connected to one end of a link rod 17 a , which will be described later, via a pin 13 h extending in the lateral direction.
  • the pin 13 h is arranged closer to the back surface side 12 b of the arm 12 than the pin 13 g . In other words, in the working attitude of the front working device 10 , the pin 13 h is arranged above the pin 13 g.
  • the turn motor 13 b rotates the components 13 c to 13 f with respect to the mounting bracket 13 a .
  • the turn motor 13 b rotates the components 13 c to 13 f about a rotation axis extending in a direction perpendicular to the pins 13 g , 13 h .
  • the hydraulic oil is supplied from a hydraulic pump (not illustrated) mounted on the upperstructure 3 to the turn motor 13 b , and returns to a hydraulic oil tank (not illustrated) mounted on the upperstructure 3 from the turn motor 13 b.
  • the pair of hydraulic cylinders 13 e , 13 f is supplied with the hydraulic oil, whereby the pair of blades 13 c , 13 d is opened and closed. More particularly, when the hydraulic oil is supplied to bottom chambers of the hydraulic cylinders 13 e , 13 f and the hydraulic oil in rod chambers thereof is discharged, the pair of blades 13 c , 13 d is closed. On the other hand, when the hydraulic oil is supplied to the rod chambers of the hydraulic cylinders 13 e , 13 f and the hydraulic oil in the bottom chambers is discharged, the pair of blades 13 c , 13 d is opened.
  • the hydraulic cylinder 16 is supplied with and discharges the hydraulic oil, and extends and contracts in accordance therewith.
  • the hydraulic cylinder 16 has a cylinder tube 16 a , a piston (not illustrated), a cylinder rod 16 b , and a cap 16 c .
  • the hydraulic cylinder 16 extends along the back side surface of the arm 12 in the longitudinal direction of the arm 12 .
  • the proximal end of the cylinder tube 16 a is rotatably supported at the proximal end side of the arm 12
  • the distal end of the cylinder rod 16 b is rotatably connected to a link rod 17 b , which will be described later.
  • the cylinder tube 16 a is a cylindrical member capable of being supplied with and discharging the hydraulic oil.
  • the cylinder tube 16 a is closed at the proximal end side and opened at the distal end side.
  • the piston reciprocates within the cylinder tube 16 a . Furthermore, the piston divides the internal space of the cylinder tube 16 a into a bottom chamber at the proximal end side and a rod chamber at the cap 16 c side.
  • the cap 16 c is attached to the distal end of the cylinder tube 16 a via a bolt (not illustrated) or the like.
  • the cap 16 c includes a through hole for allowing the cylinder rod 16 b to project while preventing the piston from projecting.
  • extension of the hydraulic cylinder 16 When the hydraulic oil is supplied from the hydraulic pump to the bottom chamber and the hydraulic oil in the rod chamber returns to the hydraulic oil tank, the piston moves in a direction for causing the cylinder rod 16 b to project from the cylinder tube 16 a (hereinafter, this operational action is referred to as “extension of the hydraulic cylinder 16 ”). On the other hand, when the hydraulic oil is supplied from the hydraulic pump to the rod chamber and the hydraulic oil in the bottom chamber returns to the hydraulic oil tank, the piston moves in a direction for withdrawing the cylinder rod 16 b into the cylinder tube 16 a (hereinafter, this operational action is referred to as “contraction of the hydraulic cylinder 16 ”).
  • FIG. 2 is a perspective view of the arm 12 and cutter 13 .
  • the link mechanism 17 is connected to the cutter 13 and the hydraulic cylinder 16 .
  • the link mechanism 17 rotates the cutter 13 with respect to the arm 12 in accordance with the extension and contraction of the hydraulic cylinder 16 .
  • the link mechanism 17 has a long bar-shaped link rod 17 a (first link rod), a pair of long bar-shaped link rods 17 b (second link rod), and pins 17 c , 17 d , 17 e (first pin, second pin, third pin) extending in the lateral direction.
  • the link rod 17 a is arranged at the back side surface 12 b side of the arm 12 .
  • the link rod 17 a extends along the back side surface 12 b of the arm 12 .
  • the link rod 17 a is not necessarily parallel to the back side surface 12 b .
  • One end of the link rod 17 a is rotatably connected to the mounting bracket 13 a via the pin 13 h .
  • the other end of the link rod 17 a is rotatably connected to each one end of the pair of link rods 17 b via the pin 17 d.
  • the pair of link rods 17 b is rotatably supported on the left side surface 12 c and right side surface of the arm 12 , respectively, via the pin 17 c .
  • one end thereof projects toward the back side surface 12 b of the arm 12
  • the other end thereof projects toward the body side surface 12 a of the arm 12 .
  • the one end of the pair of link rods 17 b (end portion at the back side surface 12 b side) is rotatably connected to the other end of the link rod 17 a via the pin 17 d .
  • a distance A between the pin 17 c and the pin 17 e is set equal to or more than a distance B between the pin 17 c and the pin 17 d (AB).
  • the stopper 18 is fixed to the back side surface 12 b of the arm 12 .
  • the stopper 18 is fixed to the back side surface 12 b at a position where the other end of the link rod 17 a abuts when the hydraulic cylinder 16 extends.
  • the top surface of the stopper 18 has a concave shape so as to be along the other end of the link rod 17 a.
  • FIG. 3 illustrates an attitude of the cutter 13 when the hydraulic cylinder contacts.
  • the link rod 17 b rotates counterclockwise in FIG. 3 about the pin 17 c .
  • the link rod 17 b rotates about the pin 17 c such that the end porion at the back side surface 12 b side moves toward the distal end side of the arm 12 and the end portion at the body side surface 12 a side moves toward the proximal end side of the arm 12 .
  • the link rod 17 a moves in a direction for pushing the cutter 13 at the position of the pin 13 h (that is, above the pin 13 g ).
  • the cutter 13 rotates in a direction indicated by an arrow in FIG. 3 (that is, crowd operation).
  • the “crowd operation” is an operation for rotating the cutter 13 toward the body side surface 12 a of the arm 12 . Then, while the distal end of the arm 12 is positioned forward of the distal end of the boom 11 , by the crowd operation, the cutter 13 rotates in the gravity direction.
  • FIG. 4 illustrates an attitude of the cutter 13 when the hydraulic cylinder extends.
  • the link rod 17 b rotates clockwise in FIG. 3 about the pin 17 c .
  • the link rod 17 b rotates about the pin 17 c such that the end portion at the back side surface 12 b side moves toward the proximal end side of the arm 12 and the end portion at the body side surface 12 a side moves toward the distal end side of the arm 12 .
  • the link rod 17 a moves in a direction for pulling the cutter 13 at the position of the pin 13 h (that is, above the pin 13 g ).
  • the cutter 13 rotates in a direction indicated by an arrow in FIG. 4 (that is, dump operation).
  • the “dump operation” is an operation for rotating the cutter 13 toward the body side surface 12 a of the arm 12 .
  • the distal end of the arm 12 is positioned forward of the distal end of the boom 11 , by the dump operation, the cutter 13 rotates in a direction opposite to the gravity direction (hereinafter, referred to as an “antigravity direction”).
  • the other end of the link rod 17 a abuts the stopper 18 just when the hydraulic cylinder 16 extends to the maximum or immediately therebefore (that is, just before the hydraulic cylinder 16 extends to the maximum).
  • Just when the hydraulic cylinder 16 extends to the maximum is, for example, when the piston gets abutted the inner surface of the cap 16 c . This prevents the cutter 13 from further rotating in the antigravity direction. As a result, a force in the direction for causing the hydraulic cylinder 16 to further extend is blocked from being transmitted from the cutter 13 to the hydraulic cylinder 16 through the link mechanism 17 .
  • the pressure receiving area at the bottom side of the piston is larger than the pressure receiving area at the rod side thereof to which the cylinder rod 16 b is connected. Furthermore, as compared with the case where an amount of projection of the cylinder rod 16 b is large, in the case where the amount of projection of the cylinder rod 16 b is small, the hydraulic cylinder 16 can stably hold a load.
  • the hydraulic cylinder 16 contracts in order to cause the cutter 13 to perform the crowd operation, it is possible to hold the cutter 13 with a large force as compared with the case where the cutter 13 is held while the hydraulic cylinder 16 extends. Therefore, in the work performed while the distal end of the arm 12 projects forward of the distal end of the boom 11 , even if an unexpected load is applied to the cutter 13 and thus the cutter 13 nearly rotates further toward the body side surface 12 a of the arm 12 , the hydraulic cylinder 16 can stably support the cutter 13 with a sufficiently large force.
  • the link rods 17 a , 17 b are elastically deformed by a load exerted thereto. Therefore, the link mechanism 17 also functions as a cushioning material for absorbing the load applied to the cutter 13 and preventing the load from being transmitted to the hydraulic cylinder 16 . That is, according to the embodiment described above, it is possible to reduce the load applied from the cutter 13 to the hydraulic cylinder 16 .
  • the distance A between the pin 17 c and the pin 17 e is set to be equal to or more than the distance B between the pin 17 c and the pin 17 d , a force generated by the hydraulic cylinder 16 can be increased and transmitted to the cutter 13 . As a result, it is possible to support the load acting on the cutter 13 more appropriately.
  • the link rod 17 a abuts the stopper 18 before the hydraulic cylinder 16 extends to the maximum.
  • the force in the direction for causing the hydraulic cylinder 16 to further extend can be prevented from being transmitted from the cutter 13 to the hydraulic cylinder 16 through the link mechanism 17 .
  • the cutter 13 has been described as one of the examples of attachments, however, a specific example of the attachments is not limited thereto.
  • the attachment may be a hanging attachment having a hook for hanging a material to be hung. It should be noted that the present invention can be applied to the work machine 1 equipped with a heavy attachment, thereby achieving particularly advantageous effects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Shovels (AREA)
  • Working Measures On Existing Buildindgs (AREA)
US17/802,159 2020-05-21 2021-05-18 Work machine Pending US20230081760A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2020088960A JP7287919B2 (ja) 2020-05-21 2020-05-21 作業機械
JP2020-088960 2020-05-21
PCT/JP2021/018759 WO2021235426A1 (ja) 2020-05-21 2021-05-18 作業機械

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US17/802,159 Pending US20230081760A1 (en) 2020-05-21 2021-05-18 Work machine

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US (1) US20230081760A1 (ja)
EP (1) EP4155464A4 (ja)
JP (1) JP7287919B2 (ja)
KR (1) KR20220126296A (ja)
CN (1) CN115135833A (ja)
WO (1) WO2021235426A1 (ja)

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JP7402559B1 (ja) 2022-09-30 2023-12-21 株式会社丸順 土工機械のアタッチメント

Citations (2)

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US7828505B2 (en) * 2005-03-18 2010-11-09 Yanmar Co., Ltd. Loading device for working machine
JP2013104275A (ja) * 2011-11-16 2013-05-30 Sumitomo (Shi) Construction Machinery Co Ltd 高所解体機

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JP3659393B2 (ja) 1999-02-15 2005-06-15 コベルコ建機株式会社 土木作業機の作業アタッチメント
KR200462294Y1 (ko) * 2010-02-10 2012-09-04 최창덕 크레인용 고철절단기
CN101942845B (zh) * 2010-08-25 2012-04-25 江苏柳工机械有限公司 装载机单动臂正转六连杆动力快换工作装置
KR101254912B1 (ko) * 2012-04-23 2013-04-15 주식회사 제이케이 중장비용 절단기의 간극 조절장치
CN202925585U (zh) * 2012-12-05 2013-05-08 山东山工机械有限公司 用于机器的横梁装置以及具有这种横梁装置的机器
US11311402B2 (en) 2013-05-06 2022-04-26 Aspen Medical Partners, Llc Scoliosis brace
CN203361216U (zh) * 2013-06-07 2013-12-25 江苏柳工机械有限公司 装载机加长型工作装置
JP6241949B2 (ja) 2014-12-18 2017-12-06 キャタピラー エス エー アール エル 作業用走行機体におけるフロントアタッチメント
CN205062867U (zh) * 2015-05-21 2016-03-02 徐工集团工程机械股份有限公司科技分公司 提高装载机铲装能力的控制装置
JP6905963B2 (ja) 2018-08-14 2021-07-21 日立建機株式会社 建設機械

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7828505B2 (en) * 2005-03-18 2010-11-09 Yanmar Co., Ltd. Loading device for working machine
JP2013104275A (ja) * 2011-11-16 2013-05-30 Sumitomo (Shi) Construction Machinery Co Ltd 高所解体機

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Publication number Publication date
JP7287919B2 (ja) 2023-06-06
EP4155464A4 (en) 2024-07-10
CN115135833A (zh) 2022-09-30
EP4155464A1 (en) 2023-03-29
JP2021183767A (ja) 2021-12-02
WO2021235426A1 (ja) 2021-11-25
KR20220126296A (ko) 2022-09-15

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