US3807783A - Cable-operated mechanical grapple - Google Patents

Cable-operated mechanical grapple Download PDF

Info

Publication number
US3807783A
US3807783A US00296209A US29620972A US3807783A US 3807783 A US3807783 A US 3807783A US 00296209 A US00296209 A US 00296209A US 29620972 A US29620972 A US 29620972A US 3807783 A US3807783 A US 3807783A
Authority
US
United States
Prior art keywords
link
arms
scoop
grab
scoops
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
US00296209A
Other languages
English (en)
Inventor
Huuksloot L Van
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.)
Nemag NV
Original Assignee
Nemag NV
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 Nemag NV filed Critical Nemag NV
Application granted granted Critical
Publication of US3807783A publication Critical patent/US3807783A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B66C3/12—Grabs actuated by two or more ropes

Definitions

  • the arms are mutually connected at some distance from their free end and are provided at their free ends with a grab-controlling means.
  • Each scoop on the side thereof opposite the side contacting the opposite scoop during closing of the grab is pivotally connected to the associated link-arms. This same side of each scoop is at the same time connected to a tensile point situated in the transversely symmetry plane of the grab.
  • the contact side of each scoop has a point which is connected with a fixed point on the link-arm of the not-associated or opposite scoop between the pivot connection of the link-arms and their free ends.
  • the present invention relates to a grab of the type comprising a set of receptacle devices or scoops to which pairs of link-arms are attached on opposite sides of the longitudinal symmetry plane of the grab.
  • the arms are mutually connected at some distance from their free ends and provided at their free ends with the grab controlling means.
  • Such a device is known from the older Netherlands Pat. application 671 1272 in Applicants name.
  • the by-pass pulleys of the controlling means for the grab are positioned substantially in the same horizontal plane as the fulcrum of the link-arms when each scoop is rotated by 70 percent out of the vertical plane.
  • each scoop on the outer side thereof opposite the side in contact with the other scoop during closing of the grab is pivotally connected to the associated link-arms. Adjacent this pivotal connection is a point on the scoop connected to a tensile point situated in the transverse symmetry plane of the grab.
  • a point on the scoop connected to a tensile point situated in the transverse symmetry plane of the grab Adjacent this pivotal connection is a point on the scoop connected to a tensile point situated in the transverse symmetry plane of the grab.
  • On the inner side of each scoop in contact with the other scoop-during closing of the grab is a point which is connected with a fixed point on the linkarm of the not-associated scoop between the pivot of the link-arms and their free ends.
  • the opening angle,'or the angle of rotation of the link-arms can be chosen considerably smaller with the device of the invention than with previous devices.
  • the link between the link-arms may be of a lighter construction since one of the link-arms need not be staggered inwardly from the pivot as was necessary in previous devices.
  • connection between the contact side of the scoop and the opposite link-arm can be formed inexpensively by a cable.
  • FIG. 1 shows a grab according to the invention in its closed position
  • FIG. 2 shows the grab in its opened position.
  • the grab or scoop device of the present invention comprises the receptacle devices or scoops l and 2.
  • a link-arm 3 is attached to the scoop l and a link-arm 4 is attached to the scoop 2.
  • a by-pass pulley 5 is provided, and at the end of the link-arm 4 remote from the scoop 2 a by-pass pulley 6 is provided.
  • To link-arm 4 is also attached a by-pass pulley 7.
  • the controlling cable 9 for opening and closing the grab is fixed at a point 10 on link-arm 4 and as clearly shown in FIG. 2 passes in an upward direction after passing over and along the pass-by pulleys 5, 6 and 7.
  • the link-arms 3 and 4 are provided in pairs disposed on both sides of the longitudinal symmetry plane of the grab (i.e., a plane parallel to the plane of the sheet of drawings).
  • the pivot between the link-arms 3 and 4 is indicated in the drawing by 8.
  • the connection between link-arm 3 and the associated scoop 1 consists of a pivot 11, whereas the connection between link-arm 4 and the associated scoop 2 is formed by a pivot 12.
  • the cables 15 and 16 are united at a point 17 situated in the transverse symmetry plane of the grab construction (i.e., a plane perpendicular to the plane of the sheet of drawings).
  • Adjacent the upper end of the inner side of the scoop l which contacts scoop 2 during closing of the grab is a point 18 which is connected through a cable 20 to a point 22 situated on the not-associated linkarm, i.e., link-arm 4.
  • a point 19 is situated adjacent the upper end of the inner side of the scoop 2, which contacts scoop 1 during closing of the grab.
  • Point 19 is connected through a cable 21 to a point 23 situated on the not-associated link-arm, i.e. link-arm 3.
  • a grab comprising:
  • a first scoop having a closed bottom, an outer side,
  • a second scoop having a closed bottom, an outer side
  • said first and second pairs of link-arms being pivotally connected at a fulcrum point adjacent the midpoints thereof;
  • control cable means for selectively pivoting said pairs of link-arms about said fulcrum point from a closed position wherein said inner sides of said first and second scoops are in contact, to an open position wherein said bottoms of said first and second scoops are vertically positioned;
  • tension means connected to said outer sides of said first and second scoops for causing said first and second scoops to pivot with respect to the respective pairs of link-arms thereof during pivoting of said pairs of link-arms from said closed position to said open position;
  • said tension means comprises a first cable connected to said first scoop, and a second cable connected to said second scoop, said first and second cables being joined at a point vertically aligned above the area of contact between said first and second scoops when in said closed position.
  • a grab as claimed in claim 1, wherein said means for limiting comprises a first cable connected between said first scoop and said second pair of link-arms, and a second cable connected between said second scoop and said first pair of link-arms.
  • each linkarm of said first and second pairs of link-arms extends in a single plane throughout the entire length thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US00296209A 1971-10-07 1972-10-10 Cable-operated mechanical grapple Expired - Lifetime US3807783A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7113803,A NL171690C (nl) 1971-10-07 1971-10-07 Schaargrijper.

Publications (1)

Publication Number Publication Date
US3807783A true US3807783A (en) 1974-04-30

Family

ID=19814201

Family Applications (1)

Application Number Title Priority Date Filing Date
US00296209A Expired - Lifetime US3807783A (en) 1971-10-07 1972-10-10 Cable-operated mechanical grapple

Country Status (6)

Country Link
US (1) US3807783A (enrdf_load_stackoverflow)
JP (1) JPS568179B2 (enrdf_load_stackoverflow)
DE (1) DE2248386C3 (enrdf_load_stackoverflow)
FR (1) FR2156135B1 (enrdf_load_stackoverflow)
GB (1) GB1357275A (enrdf_load_stackoverflow)
NL (1) NL171690C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975044A (en) * 1973-08-07 1976-08-17 Dravo Corporation Reeving system for a scissor-type clamshell bucket
US4395066A (en) * 1980-05-30 1983-07-26 Nemag B.V. Grab
US6179357B1 (en) * 1999-03-01 2001-01-30 Edwin Zenith Gabriel Automatically-actuated cargo and personnel scooping apparatus with pivoted extensions, magnets and buckets
CN111252662A (zh) * 2015-05-01 2020-06-09 内马赫有限公司 四缆线操作的剪式抓斗

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2943889C3 (de) * 1979-10-31 1982-04-01 Mannesmann AG, 4000 Düsseldorf Mehrseilgreifer
NL8204386A (nl) * 1982-11-12 1984-06-01 Nemag Nv Vorkschaargrijper.
NL2017563B1 (en) * 2016-09-30 2018-04-10 Nemag Nv Grab shell, grab and method of manufacturing a grab shell

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE286248C (enrdf_load_stackoverflow) *
US479149A (en) * 1892-07-19 Well-excavator
US991473A (en) * 1909-08-25 1911-05-09 Coke W Ballard Dredger.
US2617211A (en) * 1947-07-21 1952-11-11 William A Olson Clamshell bucket
US3544150A (en) * 1967-08-16 1970-12-01 Nemag Nv Grab

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE214434C (enrdf_load_stackoverflow) *
FR530464A (fr) * 1921-02-01 1921-12-23 Pohlig J Ag Appareil de déchargement à double pelle sans bâti de pelle fixe
FR763214A (fr) * 1933-10-31 1934-04-26 Dispositif pour augmenter l'ouverture des bennes automatiques
DE682481C (de) * 1936-11-04 1939-10-16 Francois Besnard Foerderkuebel
US3488080A (en) * 1968-03-25 1970-01-06 Alexander Hamilton Automatic grapple

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE286248C (enrdf_load_stackoverflow) *
US479149A (en) * 1892-07-19 Well-excavator
US991473A (en) * 1909-08-25 1911-05-09 Coke W Ballard Dredger.
US2617211A (en) * 1947-07-21 1952-11-11 William A Olson Clamshell bucket
US3544150A (en) * 1967-08-16 1970-12-01 Nemag Nv Grab

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975044A (en) * 1973-08-07 1976-08-17 Dravo Corporation Reeving system for a scissor-type clamshell bucket
US4395066A (en) * 1980-05-30 1983-07-26 Nemag B.V. Grab
US6179357B1 (en) * 1999-03-01 2001-01-30 Edwin Zenith Gabriel Automatically-actuated cargo and personnel scooping apparatus with pivoted extensions, magnets and buckets
CN111252662A (zh) * 2015-05-01 2020-06-09 内马赫有限公司 四缆线操作的剪式抓斗
CN111252662B (zh) * 2015-05-01 2022-06-28 内马赫知识产权有限公司 四缆线操作的剪式抓斗
EP3677536B1 (en) * 2015-05-01 2025-07-02 Nemag IP B.V. Four cable operated scissors grab

Also Published As

Publication number Publication date
DE2248386B2 (de) 1980-01-03
JPS4846106A (enrdf_load_stackoverflow) 1973-07-02
NL7113803A (enrdf_load_stackoverflow) 1973-04-10
GB1357275A (en) 1974-06-19
NL171690C (nl) 1983-05-02
FR2156135A1 (enrdf_load_stackoverflow) 1973-05-25
DE2248386C3 (de) 1984-11-15
NL171690B (nl) 1982-12-01
JPS568179B2 (enrdf_load_stackoverflow) 1981-02-21
FR2156135B1 (enrdf_load_stackoverflow) 1977-08-26
DE2248386A1 (de) 1973-04-19

Similar Documents

Publication Publication Date Title
US3807783A (en) Cable-operated mechanical grapple
US1564655A (en) Lumber-loading device
US3718362A (en) Hoist apparatus
US2916322A (en) Grapple for handling logs or the like
US3790204A (en) Grapple with semi-automatic latch
US3975044A (en) Reeving system for a scissor-type clamshell bucket
US3582127A (en) Swivel-head grapple
US3437369A (en) Handling apparatus
US3224491A (en) Hatch cover system
US3099476A (en) Stone grapple
US3582128A (en) Lifting tongs for handling heavy products
US3521925A (en) Gate operating mechanism for conveying buckets
US4176872A (en) Grab or the like
US870812A (en) Grab-bucket and operating mechanism.
US1171393A (en) Excavating apparatus.
US3488080A (en) Automatic grapple
US1712870A (en) Revolving grapple
US2224913A (en) Material handling apparatus
US3716265A (en) Grab
US1434065A (en) Grab bucket
US1434478A (en) Hoisting device
US1441023A (en) Unloading mechanism
US3690716A (en) Choker grapple
US3043620A (en) Log handling tongs
US2090817A (en) Clam bucket