US3462029A - Rocker support for bucket attachment - Google Patents

Rocker support for bucket attachment Download PDF

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Publication number
US3462029A
US3462029A US702708A US3462029DA US3462029A US 3462029 A US3462029 A US 3462029A US 702708 A US702708 A US 702708A US 3462029D A US3462029D A US 3462029DA US 3462029 A US3462029 A US 3462029A
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US
United States
Prior art keywords
stick
bucket
lug
bucket attachment
opening
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
US702708A
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English (en)
Inventor
George W Mork
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.)
NORTHWEST ENGINEERING Co A CORP OF
Original Assignee
Bucyrus Erie Co
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Filing date
Publication date
Application filed by Bucyrus Erie Co filed Critical Bucyrus Erie Co
Application granted granted Critical
Publication of US3462029A publication Critical patent/US3462029A/en
Assigned to NORTHWEST ENGINEERING COMPANY A CORP OF DE reassignment NORTHWEST ENGINEERING COMPANY A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUCYRUS-ERIE COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E02F3/28—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
    • E02F3/413—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with grabbing device
    • E02F3/4135—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with grabbing device with grabs mounted directly on a boom

Definitions

  • a support for the clamshell bucket attachment of a stick clam excavator comprises a rst bracket attached to an excavator stick and including parallel depending plates provided with rocker openings having elongated, at bottom edges transverse to the plane of movement of the stick.
  • a second bracket attached to a bucket assembly includes spaced arms between the plates which carry rocking lugs.
  • the lugs are received in the openings and are rockable therein to allow limited transverse pivotal motion of the bucket assembly; and have elongated, flat bottom edges which are in alignment and engageable with the bottom edges of the openings to minimize oscillation of the attachment.
  • the upper edges of the openings and lugs are shaped to define sets of facing, centrally located relatively closely spaced tapered thrust bosses which take initial thrust loads and minimize lost motion between the two brackets, but which can slide past one another in either direction to allow rocking.
  • This invention relates, but is not limited to, excavating machines of the type known as stick claims, in which a clamshell bucket attachment is connected directly to the end of a live stick or boom so that the stick can be used to force the bucket downwardly into the ground. It resides more specifically in a support for such a bucket attachment which provides the necessary rigidity to allow the stick to force the bucket down but still allows a desirable limited freedom of movement in a transverse plane to compensate for uneven ground conditions.
  • free transverse pivotability reduces the rigidity of the support and could make it dicult to apply substantial digging force with the stick without causing a transverse buckling. Further, the free transverse pivotability could result in undesirable lateral oscillation of the bucket as the stick is being swung between digging and dumping areas.
  • rocker type support including rocking lugs which have elongated, at bottom edges that are aligned and engageable with elongated at bottom edges of rocker openings. Transverse pivotal movement in either direction causes the lugs to rock about their oposite edges so that there is a moment arm which helps to urge the bucket attachment to return to a vertical position, and minimizes oscillation.
  • Another specific object is to provide a rocking lug and opening in which the top edge of the opening is engageable with the lug to limit a rocking motion.
  • Still another specific object of the invention is to provide a construction in which a lug is rockable in an opening, but where both the lug and the opening are shaped to provide centrally located, facing thrust bosses which minimize lost motion and take initial thrust loads while being capable of sliding past one another in either direction to allow for rocking.
  • the invention also contemplates the provision of a support having all of the foregoing and other advantages which is mechanically strong and adaptable to large machines while being relatively simple and inexpensive to manufacture, assemble and maintain.
  • FIG. 1 is a schematic side view in elevation of a stick clam excavator incorporating a bucket attachment support according to this invention
  • FIG. 2 is an enlarged fragmentary end view in elevation, partially broken away and with a tilted or rocked position of the bucket attachment shown in broken lines, showing the support of PIG. l, and
  • FIG. 3 is an enlarged fragmentary side view in elevation, with parts shown broken away and in cross section. further illustrating the support of FIG. 1.
  • FIG. 1 of the drawings is a generally conventional stick clam type of excavator, and for that reason it is not shown and will not be described in detail.
  • the machine includes a main frame 1 which is revolvably mounted on a crawler base 2.
  • a boom 3 is footed on the frame 1 and is actuated in a vertical plane by means of a pair of parallel hydraulic hoist cylinders 4, only one of which can be seen in FIG. l.
  • a handle or stick 5 is pivotally mounted at the end of the boom 3 and is actuated in the same vertical plane by means of a hydraulic digging cylinder 6.
  • a clamshell bucket attachment designated generally by .the reference numeral 7 is mounted at the end of the stick 5 by means of the support which constitutes this invention and which will be described in detail hereinafter.
  • the bucket attachment 7 shown in FIG. 1 is of the type shown and described in detail in the copending application of George W. Mork and Carl F. Novotny, Ser. No. 702,728, led Feb. 2, 1968 to which reference may be had for a more detailed description. It comprises, in essence, a hydraulic cylinder casing 8, a cross head housing 9 attached to the rod end of the casing ⁇ 8, and bucket halves 10 pivotally mounted at the outer end of the housing 9.
  • the rod (not shown) of the cylinder 8 operates in the housing 9 to move a cross head 11 which extends outwardly on opposite sides of the housing 9 and is connected to respective bucket halves 10 by thrust links 12, extension and retraction of the rod obviously causing opening and closing of the bucket halves 10.
  • this particular type of bucket attachment is highly satisfactory, it would be possible to use other types of attachments known to the art with the support of this invention, and the invention is not necessarily limited to the particular attachment 7 that is shown.
  • the support for the bucket attachment 7 comprises a first or upper bracket designated generally by the reference numeral 13 which is pivotally attached to the end of the stick by means of a transverse pin 14.
  • the entire bucket attachment 7 in effect depends from the bracket 13, and, therefore, the pin 14 forms a conventional mounting for the bucket attachment 7 which allows it to pivot relatively freely in the same vertical plane as the stick 5 and boom 3.
  • the bracket 13 includes quill portions 15 on laterally opposite sides of the tip of the stick 5, which portions actually receive the pin 14, suitable means (not shown) being provided to lock the pin 14 in place. It further includes, as integral or attached members, opposite, generally U-shaped, downwardly depending support plates 16 which are connected at their upper ends to the quill portions 15 and have central thickened portions 17 parallel to and aligned with one another. Angled cover plates 18 extend between the outside side edges of tht plates 16 to form a generally enclosed unit.
  • each plate 16 is provided with a rocker opening 19, the two openings 19 being the same and in line with one another, and lying in parallel planes transverse to the plane of movement of the boom 3 and stick 5.
  • the rocker openings 19 are generally rectangular in form, and have elongated, fiat bottom edges 20, which are also transverse to the planes of the boom 3 and stick 5.
  • the top edge of each opening 19 is shaped to define a generally centrally located, downwardly facing tapered thrust boss 21 which has a flat thrust bearing surface 22 at its apex.
  • the support further comprises a lower or second bracket designated generally by the reference numeral 23.
  • the bracket 23 includes a central or base portion 24 and spaced, plate-like, parallel upwardly extending arms 25 which are connected thereto by bolts 26.
  • the arms 25 are received between and outwardly ,face respective support plates 16.
  • Each arm 25 carries an integral or attached rocker lug 27 which faces outwardly and is received in a respective rocker opening 19 to support the second bracket 23 from the first bracket 13.
  • the lugs 27 are also of generally rectangular configuration and have elongated, fiat bottom edges 28 which are in alignment and engageable with the opening bottom edges 20.
  • the upper edge of each lug 27 is shaped to define a generally central, tapered, upwardly facing thrust boss 29 having a fiat thrust bearing surface 30 at its apex.
  • the lugs 27 extend outwardly through the openings 19; and square cover plates 31 are secured to the laterally outermost surfaces of the lugs 27 by means of bolts 32.
  • the plates 31 help in preventing the entry of dirt, pebbles, etc. which could clog up the rocker openings 19 or otherwise interfere with operation.
  • the base of the cylinder casing 8 is attached to the bracket base portion 24 by a rotatable connection 33 which can be of any suitable type known to the art and is, therefore, shown only schematically.
  • Any suitable form of conventional hydraulic motor 34 is mounted on the base 24 and is operable through suitable circuitry (not shown) to effect rotation of the casing 8. This results in what is termed a swivel action in which the entire bucket attachment 7 can be rotated about its longitudinal axis. This allows the orientation of the bucket to be changed and is useful, for example, should it be desired to dig a wider trench or dig a trench parallel to the line of advance of the machine.
  • the second bracket 23 In the normal position shown in the drawings, in which the bucket attachment 7 is off the ground and hanging vertically, the second bracket 23 is in a lowered position with respect to the first bracket 13. In this position, the lugs 27 are at the bottoms of the openings 19 with the fiat lug bottom surfaces 28 fiat against the fiat bottom edges of the openings 19. In this position, respective thrust bosses 21 and 29 face and are in alignment with one another, with the surfaces 22 and 30 facing slightly separated vertically, all as can best be seen in full lines in FIG. 2.
  • the bucket attachment 7 is first opened and then lowered by means of the stick 5, and/or the boom 3, until it rests on the ground. Further downward movement of the tip of the stick 5 will then, in effect, cause the rocker lugs 27 to move upwardly in the openings 19. The first phase of this movement, substantially regardless of whether the ground is level or not, will result in the two thrust bosses 21, 29 on each side being moved together. As soon as the surfaces 22, 30 meet, there is a direct butting connection between the stick 5 and bucket attachment 7 so that the stick 5 can then be used to force the bucket attachment 7 downwardly.
  • the bucket attachment 7 is capable of tilting transversely to a position where the rocker lugs 27 have rocked to the position shown in dotted lines in FIG. 2, or to a corresponding position in the opposite direction.
  • the dotted line position shown in FIG. 2 has been reached, no further transverse tilting in that direction is possible, however, since the top edge of the lug 27 engages the top edge of the opening 19 as seen, this being accomplished by having the height of the opening 19 less than the length of the lug 27 or by any other configuration providing the desired engagement.
  • the bosses 21, 29 simply slide past one another in either direction as required. Subsequent lifting of the stick 5 will of course allow the elements to resume their normal positions.
  • the transverse pivotal movement allowed by the rocker connection between the brackets 13, 23 is very important in compensating for laterally uneven ground conditions which might occur, for example, in digging along the side of a hill or where one side or half of the bucket hits a rock or is in harder ground.
  • the concept of providing for such movement is of course not new per se, but the rocker construction shown provides a number of major advantages over any other known arrangement.
  • using openings and lugs with elongated fiat bottom edges or surfaces transverse to the plane of the stick 5 is important in that it provides a moment arm tending to keep the bucket attachment 7 vertical at all times. That is, whenever the bucket attachment tilts, the lugs 27 rock about their opposite edges.
  • bosses 21, 29 are important. To provide for rocking of the lugs 27, it is obvious that there must be a substantial vertical distance between the top edges of the lugs 27 and the openings 19 when the elements are in normal position with the edges 28, 20 in engagement. This would ordinarily result in considerable undesirable lost motion before the bracket 13 could corne down and establish a direct connection between the top edges of the lugs 27 and openings 19, enabling the stick 5 to exert a downward force.
  • the bosses 21, 29 ⁇ minimize the gap and minimize lost motion by providing a quick initial engagement, but they can easily slide or move past one another in either direction so that they do not interfere with the desired tilting and ultimate nal engagement.
  • the construction shown is obviously relatively simple, while being of great mechanical strength so that it is readily adaptable to large machines.
  • a rst bracket adapted to be attached to a live excavator stick and including a downwardly depending support plate defining a rocker opening having an elongated at bottom edge
  • a second bracket adapted to be connected to a bucket attachment and including an upwardly extending arm facing the plate and provided with a rocker lug that is received in the opening and that has an elongated at bottom edge aligned and engageable with the bottom edge of the opening, the top edges of the lug and opening being vertically spaced when the bottom edges are in engagement to allow the lug to rock with respect to the opening.
  • top edges of the lug and opening are shaped to define centrally located, facing thmst bosses which, when the bottom edges are in engagement, are in alignment and spaced apart a distance less than the spacing between the top edges, the bosses being adapted to be moved directly against one another to transmit a force from one bracket to the other and to slide past one another in either direction to allow the lug to rock.
  • top edges of the lug and opening are shaped to define centrally located, facing thrust bosses which, when the bottom edges are in engagement, are in alignment and spaced apart a distance less than the spacing between the top edges, the bosses being adapted to engage one another to transmit a force from one bracket to the other and to slide past one another in either direction to allow the lug to rock.
  • first bracket has a pair of spaced plates, each with a rocker opening, the two openings being in parallel planes; and the second bracket has two spaced arms facing respective plates, each having a lug received in a respective opening.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Shovels (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Earth Drilling (AREA)
  • Component Parts Of Construction Machinery (AREA)
US702708A 1968-02-02 1968-02-02 Rocker support for bucket attachment Expired - Lifetime US3462029A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70270868A 1968-02-02 1968-02-02

Publications (1)

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US3462029A true US3462029A (en) 1969-08-19

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US702708A Expired - Lifetime US3462029A (en) 1968-02-02 1968-02-02 Rocker support for bucket attachment

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US (1) US3462029A (de)
JP (1) JPS4811123B1 (de)
DE (1) DE1905471C3 (de)
GB (1) GB1252652A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2122294A1 (de) * 1971-01-18 1972-09-01 Poclain Sa
US3726349A (en) * 1967-12-23 1973-04-10 Orenstein & Koppel Ag Hydraulically operable apparatus for making slit trenches
DE2343558A1 (de) * 1972-08-25 1974-02-28 Caterpillar Tractor Co Greifschalen-baggerkorb
US3896950A (en) * 1974-01-02 1975-07-29 Willard E Mccain Excavating machine
US4032025A (en) * 1975-06-20 1977-06-28 Audie B. Tomlinson Backhoe bucket tilt
US4497608A (en) * 1983-06-13 1985-02-05 The Trustees Of The Toronto General Burying Grounds Monument foundation digger
US20110081193A1 (en) * 2008-06-08 2011-04-07 Lars Gunnar Nilsson Method and arrangement related to a swing damper
US20210062454A1 (en) * 2019-08-28 2021-03-04 Raymond E. Bergeron Excavator mounted head and assembly for supporting and angularly adjusting a clamshell style bucket assembly during such as a dredging operation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5824947Y2 (ja) * 1975-04-03 1983-05-28 株式会社豊田自動織機製作所 ボウキ ニオケル カイセンロ−ラ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725996A (en) * 1953-04-22 1955-12-06 Paul F Britton Universal head for controlling clamshell bucket and similar material handling devices
US2755946A (en) * 1952-01-02 1956-07-24 James I Bevan Clamshell earth-moving machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755946A (en) * 1952-01-02 1956-07-24 James I Bevan Clamshell earth-moving machine
US2725996A (en) * 1953-04-22 1955-12-06 Paul F Britton Universal head for controlling clamshell bucket and similar material handling devices

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726349A (en) * 1967-12-23 1973-04-10 Orenstein & Koppel Ag Hydraulically operable apparatus for making slit trenches
FR2122294A1 (de) * 1971-01-18 1972-09-01 Poclain Sa
DE2343558A1 (de) * 1972-08-25 1974-02-28 Caterpillar Tractor Co Greifschalen-baggerkorb
US3896950A (en) * 1974-01-02 1975-07-29 Willard E Mccain Excavating machine
US4032025A (en) * 1975-06-20 1977-06-28 Audie B. Tomlinson Backhoe bucket tilt
US4497608A (en) * 1983-06-13 1985-02-05 The Trustees Of The Toronto General Burying Grounds Monument foundation digger
US20110081193A1 (en) * 2008-06-08 2011-04-07 Lars Gunnar Nilsson Method and arrangement related to a swing damper
US20210062454A1 (en) * 2019-08-28 2021-03-04 Raymond E. Bergeron Excavator mounted head and assembly for supporting and angularly adjusting a clamshell style bucket assembly during such as a dredging operation
US11613868B2 (en) * 2019-08-28 2023-03-28 Raymond E. Bergeron Excavator mounted head and assembly for supporting and angularly adjusting a clamshell style bucket assembly during such as a dredging operation

Also Published As

Publication number Publication date
DE1905471C3 (de) 1974-10-17
JPS4811123B1 (de) 1973-04-11
GB1252652A (de) 1971-11-10
DE1905471A1 (de) 1969-08-28
DE1905471B2 (de) 1974-03-14

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Date Code Title Description
AS Assignment

Owner name: NORTHWEST ENGINEERING COMPANY 201 WEST WALNUT STRE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUCYRUS-ERIE COMPANY;REEL/FRAME:004433/0395

Effective date: 19850314