US3314709A - Hydraulically operated mechanical grab - Google Patents

Hydraulically operated mechanical grab Download PDF

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Publication number
US3314709A
US3314709A US442328A US44232865A US3314709A US 3314709 A US3314709 A US 3314709A US 442328 A US442328 A US 442328A US 44232865 A US44232865 A US 44232865A US 3314709 A US3314709 A US 3314709A
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US
United States
Prior art keywords
piston
piston rod
cylinder
grab
hydraulically operated
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
US442328A
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English (en)
Inventor
Gabriel L Guinot
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.)
Poclain SA
Original Assignee
Poclain SA
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 Poclain SA filed Critical Poclain SA
Application granted granted Critical
Publication of US3314709A publication Critical patent/US3314709A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/14—Grabs opened or closed by driving motors thereon
    • B66C3/16—Grabs opened or closed by driving motors thereon by fluid motors
    • 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

Definitions

  • This invention relates to an hydraulically operated mechanical grab of the kind comprising an hydraulic cylinder, a piston slidable in said cylinder, a piston rod connected with said piston and projecting through the lower end of said cylinder, two or more grab members each pivotally connected with the outer free end of said piston rod and each pivotally connected to an arm or link which is in turn pivotally connected with said cylinder, said piston also being provided with a piston rod projecting through the upper end of said cylinder for connection with jib of a crane or the like.
  • the object of the present invention is to overcome this disadvantage and with this object the invention consists of an hydraulically operated mechanical grab of the kind described wherein the lower piston rod to which the grab members are pivoted is connected with the piston or part of the piston and rotatable about its axis relative to said piston or part of said piston.
  • FIGURE 1 is a longitudinal axial section of the hydraulic grab showing the grab members in side elevation
  • FIGURE 2 is a similar view to FIGURE 1 of an alternative embodiment.
  • the grab comprises a double acting hydraulic jack 6 including an hydraulic cylinder 10 in which is slidably mounted a piston comprising two separa-ble piston parts 9a, 912, said piston is connected with an upper piston rod 6d, and a lower piston rod 6a.
  • the upper piston rod 6d projects through the upper end of the cylinder 10 and is provided with a substantially U-shaped or forked outer free end 15 by means of which the grab can be attached to the jib of a crane or the like.
  • the lower piston rod 6a projects through the lower end of the cylinder 10 and is provided at its outer free end with a cross arm 3 fixed to said piston rod by means of a nut 7 screwed onto a screw threaded portion 6c of a projection 6b at the end of the piston rod.
  • the projection 61) is of polygonal cross section and is seated in an aperture 3a of corresponding cross-section whereby said cross arm 3 is prevented from rotating relative to the piston rod.
  • grab members 1 and 2 are pivotally mounted on horizontal pivots and 4 re spectively and said grab members are each pivotally connected to one end of a link or lever 13 and 14 respectively whilst said links or levers are pivotally connected at their opposite ends to lugs 11 and 12 respectively on the cylinder 10.
  • the part 9a of the piston 9a, 9b is integral with the lower piston rod 6a and is connected in axial alignment with the piston part 9b in such a manner that the two parts 90, 9b of the piston are rotatable relative to each other about their axis.
  • the upper piston part 915 is provided with an inverted T-section projection 8 which fits into a correspondingly shaped recess in the lower piston part 9a.
  • the conduit 19 in the upper piston rod 6d is connected with the bottom chamber of the cylinder through a substantially radial duct 20 in the lower piston rod 6a, said duct communicating with said conduit 19 through a ducted plug member 21 mounted in an axial bore in said lower piston rod 6a, said plug being provided in its external surface with an annular groove or channel 21a connected on one side with a radial bore in said plug leading to the conduit 19 and on the other side with said duct 20 in the piston rod 6a.
  • the piston rod can rotate about its axis relative to said plug 21 whilst maintaining communication between duct 20 and conduit 19.
  • FIG- URE 2 differs from the embodiment according to FIG- URE 1 in that it is provided with a one-piece piston 9 integrally connected with the upper piston rod 6:! and connected with the lower piston rod 6a in a similar manner to that described with reference to FIGURE 1. With this construction the pressure fluid conduit 19 communicates directly with the lower cylinder chamber as shown.
  • FIGURE 2 embodiment further differs from that according to FIGURE 1 in that the grab members 1 and 2 are pivoted directly to the lower piston rod about a common horizontal axis 22 thus dispensing with the cross arm 3 of FIGURE 1.
  • the hydraulic grab according to the invention operates in a similar manner to known grabs but in the event of damage or fracture of the lower piston rod 6a said piston rod can be replaced without any need for replacing the piston or other parts of the grab assembly.
  • An hydraulically operated mechanical grab comprising an hydraulic cylinder, a piston slidable in said cylinder, a piston rod connected with said piston, the lower part of said rod projecting through the lower end of said cylinder, at least two grab members each rotatable with and mounted on the free end of said lower part of said piston rod in such manner as to pivot about an axis which is transverse to the longitudinal axis of said lower rod part and each grab member pivotally connected with said cylinder, the upper part of said rod projecting through the upper end of said cylinder for connection with the jib of crane wherein said lower part of said piston rod is connected with said upper part of piston rod by connecting means mounted for relative free rotation of said parts of piston rod around their common axis, said connecting means being located Within said cylinder.
  • each of said grab members is pivotally connected with a cross-arm rigidly secured to the outer free end of the lower piston rod.
  • each of said grab members is pivoted directly to the outer free end of said lower piston rod about a common pivot axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Jib Cranes (AREA)
US442328A 1964-03-25 1965-03-24 Hydraulically operated mechanical grab Expired - Lifetime US3314709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR968586A FR1398053A (fr) 1964-03-25 1964-03-25 Perfectionnements aux bennes preneuses

Publications (1)

Publication Number Publication Date
US3314709A true US3314709A (en) 1967-04-18

Family

ID=8826305

Family Applications (1)

Application Number Title Priority Date Filing Date
US442328A Expired - Lifetime US3314709A (en) 1964-03-25 1965-03-24 Hydraulically operated mechanical grab

Country Status (5)

Country Link
US (1) US3314709A (de)
BE (1) BE769275Q (de)
DE (1) DE1267813B (de)
FR (1) FR1398053A (de)
GB (1) GB1060187A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421791A (en) * 1966-12-20 1969-01-14 Hiab Foco Ab Catching tool for a loading crane
US3451151A (en) * 1966-11-07 1969-06-24 Poclain Sa Bucket ejector assembly for an excavating grab
US3481640A (en) * 1966-11-24 1969-12-02 Poclain Sa Means for orientating the earth working implement of a mechanical earth working machine
US3759564A (en) * 1971-03-08 1973-09-18 Pierce Pacific Manuf Inc Grapple
US3795421A (en) * 1972-11-29 1974-03-05 P Vohl Grapple assembly
US3814471A (en) * 1971-01-18 1974-06-04 Poclain Sa Grab buckets
US3881263A (en) * 1973-04-18 1975-05-06 Poclain Sa Angular position controller for clam-shell bucket
US3914886A (en) * 1972-08-25 1975-10-28 Caterpillar Tractor Co Clamshell bucket assembly and valve means associated therewith
US5443294A (en) * 1993-09-22 1995-08-22 Hawco Manufacturing Co. Single-line clamshell bucket

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487880A1 (fr) * 1981-01-21 1982-02-05 Poclain Sa Benne preneuse, notamment a coquilles
FR2563253B1 (fr) * 1984-04-20 1987-08-14 Lapalus Gaston Benne preneuse
AU2013245510B2 (en) * 2012-10-19 2017-09-28 Joy Global Surface Mining Inc Fluid conveyance system
DE202015005202U1 (de) * 2015-07-21 2016-10-24 Rolf Mieger Greifermechanik für den Greifer einer Baumaschine
DE202020104693U1 (de) 2020-08-13 2021-11-16 Rolf Mieger Antrieb für einen Greifer, Greifer und Baumaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US539962A (en) * 1895-05-28 Bucket for dredging-machines
FR1136481A (fr) * 1955-10-13 1957-05-23 Poclain Atel Benne-preneuse à commande hydraulique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023044A (en) * 1956-04-03 1962-02-27 Joy Mfg Co Grapple
DE1808867U (de) * 1960-02-06 1960-03-31 Ahlmann Carlshuette K G Hydraulischer zwei- oder mehrschalengreifer.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US539962A (en) * 1895-05-28 Bucket for dredging-machines
FR1136481A (fr) * 1955-10-13 1957-05-23 Poclain Atel Benne-preneuse à commande hydraulique
DE1123264B (de) * 1955-10-13 1962-02-01 Poclain Atel Greiferbagger

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451151A (en) * 1966-11-07 1969-06-24 Poclain Sa Bucket ejector assembly for an excavating grab
US3481640A (en) * 1966-11-24 1969-12-02 Poclain Sa Means for orientating the earth working implement of a mechanical earth working machine
US3421791A (en) * 1966-12-20 1969-01-14 Hiab Foco Ab Catching tool for a loading crane
US3814471A (en) * 1971-01-18 1974-06-04 Poclain Sa Grab buckets
US3759564A (en) * 1971-03-08 1973-09-18 Pierce Pacific Manuf Inc Grapple
US3914886A (en) * 1972-08-25 1975-10-28 Caterpillar Tractor Co Clamshell bucket assembly and valve means associated therewith
US3795421A (en) * 1972-11-29 1974-03-05 P Vohl Grapple assembly
US3881263A (en) * 1973-04-18 1975-05-06 Poclain Sa Angular position controller for clam-shell bucket
US5443294A (en) * 1993-09-22 1995-08-22 Hawco Manufacturing Co. Single-line clamshell bucket

Also Published As

Publication number Publication date
GB1060187A (en) 1967-03-01
FR1398053A (fr) 1965-05-07
BE769275Q (fr) 1971-11-03
DE1267813B (de) 1968-05-09

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