US3544150A - Grab - Google Patents

Grab Download PDF

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Publication number
US3544150A
US3544150A US748089A US3544150DA US3544150A US 3544150 A US3544150 A US 3544150A US 748089 A US748089 A US 748089A US 3544150D A US3544150D A US 3544150DA US 3544150 A US3544150 A US 3544150A
Authority
US
United States
Prior art keywords
grab
cables
cistern
supporting plates
cisterns
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
US748089A
Other languages
English (en)
Inventor
Leendert Van Huuksloot
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 US3544150A publication Critical patent/US3544150A/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
    • B66C3/12—Grabs actuated by two or more ropes

Definitions

  • the pivot for the supporting plates is so designed, that the portion of the supporting plate of a cistern connected to said cistern is located on one side of that pivot and its extension carrying the by-pass and securing means for the controlling cable on its other side, whereas the portions of the other cistern substantially lie in the same plane.
  • This invention relates to a grab comprising two mutually pivotal cisterns the supporting plates of which are extended beyond the fulcrum and at their ends are provided with means for by-passing and contingently tying up the controlling cable or cables.
  • the invention has for its object to provide a grab of the type described which normally is indicated as a grab, so that the construction as a whole is light in weight and easily manageable whereas from his control cabin the operator of the grab is in a position to properly survey the run of the controlling cable or cables and the filling and emptying of the grab, respectively.
  • the pivot for the supporting plates is so designed that the portion of the supporting plate of a cistern connected to said cistern is located on one side of said pivot and its extension carrying the bypass and securing means for the controlling cable or cables on its other side, whereas said portions of the other cistern substantially lie in the same plane.
  • the grab cisterns are capable of being opened to such an extent that with suflicient spread their bottoms will extend in the vertical plane. Furthermore, in this way a grab can be constructed which is of lightweight, nevertheless robust design. The pivotal construction as such can also be extremely simple.
  • the elongated portions of the supporting plates of the cisterns, positioned on the side of the latter and supporting the by-pass pulleys of the controlling cable or cables, are connected at their edges by a plate to form a protective casing for said by-pass pulleys.
  • a further advantage of said measure is that the grab in itself becomes somewhat more rigid.
  • the grab of the invention comprises no frame or housing in which the cisterns with their extended portions are received.
  • the grab cisterns have ears formed on their backs and spaced from their bottoms for tying up cables or the like which on the other hand are connected to a common point of suspension. This measure contributes to a material saving of weight in the grab construction.
  • FIG. 1 shows a top view of an opened grab according to the invention
  • FIG. 2 is a side view thereof
  • FIG. 3 shows the grab of the invention perspectively schematically represented also in half-opened position.
  • Cistern 1 is provided with supporting plates 3 and 4 which are secured to the bottom 5 of the cistern 1, e.g., by welding. At its back, at 6, the cistern is fully opened.
  • the bottom 5 extends along and beyond both sides of the supporting plates 3 and 4 and is connected to the side plates 7 and 8 having the pattern shown in FIG. 1, i.e., at 9 and 10 they are connected again to the supporting plates 3 and 4, e.g., they are fixed to them by welding.
  • a stiffening element e.g., a tube forming a connection between the side plates 7, 8 mutually, and the supporting plates 3 and 4, respectively.
  • the cistern 2 is secured to sup porting plates 12 and 13 which are fixed to the bottom 14 by welding, whereas said cistern is sideways defined by plates 15 and 16, secured at 17 and 18 to the supporting plates 12 and 13, respectively.
  • the supporting plates 3 and 4, and 12 and 13, respectively, are hingedly secured to each other at 19. According to the invention this is achieved in a particular manner.
  • the supporting plates 3 and 4 are disposed on the outside of the pivot 19, whereas the extensions 20 and 21 are positioned exactly on the other side of that pivot, in this case on its inside.
  • 22 and 23 represent box bushes secured to the supporting plate 12, the extension of which is indicated 26.
  • the supporting plate 12 and its extension 26 may contingently consist of one piece.
  • Box bushes 24 and 25 are secured to the supporting plate 13, the extension of which is indicated 27.
  • the supporting plate 13 with its extension 27 may also contingently form one entirety.
  • 28 and 29 are journals forming the fulcrum for the pivot 19.
  • the journal 28 forms a fixed connection between the supporting plate 3 and its extension 20 whereas the journal 29 forms a fixed connection between the supporting plate 4 and its extension 21.
  • the pivot 19 as a whole can be designed as a roller bearing; however it is also possible to apply a so-called slide hearing.
  • a box bushing, represented in the drawing 30, mutually connects the supporting plate extensions 20, 21 and can also serve for stiffening the pivot 19. Possibly the pivot shaft of the pivot 19 could be extended so as to render the box bush 30 superfluous.
  • the grab of the invention is held in cables 37, 38 and 39, 40, respectively, which are fixed to the cistern in ears formed on it for that purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Storing, Repeated Paying-Out, And Re-Storing Of Elongated Articles (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
US748089A 1967-08-16 1968-07-26 Grab Expired - Lifetime US3544150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE6711272,A NL159934C (nl) 1967-08-16 1967-08-16 Grijper met twee, via paren plaatvormige draagarmen, onderling scharnierbaar verbonden bakken.

Publications (1)

Publication Number Publication Date
US3544150A true US3544150A (en) 1970-12-01

Family

ID=19800966

Family Applications (1)

Application Number Title Priority Date Filing Date
US748089A Expired - Lifetime US3544150A (en) 1967-08-16 1968-07-26 Grab

Country Status (9)

Country Link
US (1) US3544150A (da)
BE (1) BE719201A (da)
DK (1) DK124192B (da)
FI (1) FI46942C (da)
FR (1) FR1578416A (da)
GB (1) GB1183903A (da)
NL (1) NL159934C (da)
NO (1) NO127717B (da)
SE (1) SE347940B (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807783A (en) * 1971-10-07 1974-04-30 Nemag Nv Cable-operated mechanical grapple
US3975044A (en) * 1973-08-07 1976-08-17 Dravo Corporation Reeving system for a scissor-type clamshell bucket
US4538848A (en) * 1982-11-12 1985-09-03 Nemag B.V. Grab

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1116020A (en) * 1966-05-26 1968-06-06 Nemag Nv Grab

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1116020A (en) * 1966-05-26 1968-06-06 Nemag Nv Grab

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807783A (en) * 1971-10-07 1974-04-30 Nemag Nv Cable-operated mechanical grapple
US3975044A (en) * 1973-08-07 1976-08-17 Dravo Corporation Reeving system for a scissor-type clamshell bucket
US4538848A (en) * 1982-11-12 1985-09-03 Nemag B.V. Grab

Also Published As

Publication number Publication date
FI46942C (fi) 1973-08-10
DE1756903B2 (de) 1976-04-22
NL159934C (nl) 1982-03-16
FI46942B (da) 1973-05-02
NL159934B (nl) 1979-04-17
BE719201A (da) 1969-01-16
DE1756903A1 (de) 1970-08-27
DK124192B (da) 1972-09-25
GB1183903A (en) 1970-03-11
SE347940B (da) 1972-08-21
FR1578416A (da) 1969-08-14
NO127717B (da) 1973-08-06
NL6711272A (da) 1969-02-18

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