US3716265A - Grab - Google Patents

Grab Download PDF

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Publication number
US3716265A
US3716265A US00020877A US3716265DA US3716265A US 3716265 A US3716265 A US 3716265A US 00020877 A US00020877 A US 00020877A US 3716265D A US3716265D A US 3716265DA US 3716265 A US3716265 A US 3716265A
Authority
US
United States
Prior art keywords
grab
side plates
containers
cables
controlling
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
US00020877A
Other languages
English (en)
Inventor
Hunksloot 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 US3716265A publication Critical patent/US3716265A/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 side plates of the containers are elongated beyond their fulcrum and means are provided at their ends for leading the controlling cable or cables.
  • the side plates are almost in a direct line with the closing edges of the grab containers and beyond the fulcrum are staggered so that they may pass each other.
  • the ends of t e side plates supporting the rollers for leading the controlling cable when in opened position of the grab are almost in the same horizontal plane as the pivot of t e grab containers.
  • the ends of the side plates of one of t e grab containers supporting bypass rollers of the controlling cable form an angle of about 90 with respect to the remaining portion of the side plates.
  • This invention relates to a grab comprising two mutually pivotal cisterns, secured in a carrier, the side plates of said container being elongated beyond their fulcrum and means being provided at their ends for leading round dr tying up the controlling cables.
  • a grab of this type s already known.
  • the object of the invention is to improve a grab so that a much simpler and more compact construction is possible, especially as far as the controlling mechanism is concerned.
  • this is achieved in that the side plates are almost in a direct line with the closing edges of the grab containers and, beyond the fulcrum, are so staggerdly designed that they are capable of passing each other, whereas the ends of the side plates, supporting the rollers for leading the controlling cables round, in the opened position of the grab, are almost in the same horizontal plane as the pivot of the grab cisterns or containers. So a construction is obtained in which the controlling mechanism in the opened position of the grab is disposed practically completely within the space encompassed by the grab containers. A further advantage of this construction is that the closing force has reached its maximum at the end of the closing movement. Finally a very favourable rate of weightzcontent is obtained comparable with that of a so-called Trem-grab.
  • a preferential embodiment for constructing the controlling mechanism within an as much confined space as possible is obtained as the ends of the side plates of one of the grab containers, said ends supporting the by-pass rollers of the controlling cable, form an angle of about 90 degrees with respect to the remaining portion of said side plates. So the axles of the by-pass rollers are capable of being positioned as nearly to the fulcrum of the side plates of the grab container as possible which results in a favourable closing characteristic of the grab which latter on the other hand has the great advantage of being able to be widely opened.
  • FIG. 1 shows very schematically a side view of a grab according to the invention in closed position
  • FIG. 2 the grab in its opened position
  • FIG. 3 perspectively, the left portion of the grab of FIGS. 1 and 2, respectively and
  • FIG. 4 perspectively, its right portion.
  • 1 represents a portion of the carrier construction of the grab which at point 2 is hung to one or more lifting cables.
  • 3 is a lever arm which at 4 is pivotally secured to the carrier 1. As appears from FIGS. 3 and 4 the portions 1 and 3 of the grab are provided in pairs.
  • the side 7 of one grab container is elongated with a side plate 10 the end 11 of which beyond the fulcrum 9 is staggerdly designed, i.e. the portion 11 is not disposed in the same plane, therefore not in a direct line with the portion 10 of the side plate.
  • FIG. 3 illustrates one of the controlling cables which is led over the discs 14 and 15 which cables are finally secured at point 16-. By exerting a tensile force upon the cables 13 the grab containers 5 and 7 may be closed. As also appears from the drawing the side plates 10 and 12 are secured to the grab containers in question near their closing edges.
  • FIG. 17 is a roller or disc the purpose of which is to keep the controlling cables 13 free from the pivot axle 9 during the opening and closing of the grab, by which wear of the cables 13 may be prevented.
  • FIG. 3 shows how the left portion of the grab is designed.
  • the side plates 12 are provided with bores 18 through which the pivot axle 9 extends.
  • the ends 23 of the side plate are staggered with respect to the remaining portion 12 of the side plates, which ends 23 are connected by a bar 19. Further a bar 20 is provided, supports 21 being disposed between the bars 19 and 20.
  • These carriers comprise axles for the bypass rollers 15 for the controlling cable 13.
  • the roller 17 the purpose of which as already observed is to keep the controlling cables 13 free from the pivot axle 9 is freely rotatably supported on a shaft secured between the ends 23-.
  • the grab In the position illustrated in FIG. "1 the grab is closed, the controlling cables 13 passing over the discs 22, 14 and 15 in the way indicated. The entire controlling mechanism however is disposed within the contour of the grab. Now the grab, which in the position illustrated, may be filled with the material to be conveyed, may be transported 'with the help of lifting cables secured at point 2 and the controlling cables 13.
  • a grab comprising a carrier, two mutually pivotal containers secured to said carrier, each of said containers having side plates elongated beyond their fulcrum, the ends of said side plates of one of said containers extending at an angle of substantially from the remaining portion of said side plates,,said ends of said side plates of said one container extending substantially downwardly when said containers are in the opened position, rollers mounted at the ends of said side plates for guiding a controlling cable, said side plates being substantially in a direct line with the closing edges of said containers, said side plates having portions beyond said fulcrum stag-"

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Chain Conveyers (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
US00020877A 1966-05-26 1970-03-27 Grab Expired - Lifetime US3716265A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6607301.A NL156367B (nl) 1966-05-26 1966-05-26 Grijper.

Publications (1)

Publication Number Publication Date
US3716265A true US3716265A (en) 1973-02-13

Family

ID=19796707

Family Applications (1)

Application Number Title Priority Date Filing Date
US00020877A Expired - Lifetime US3716265A (en) 1966-05-26 1970-03-27 Grab

Country Status (10)

Country Link
US (1) US3716265A (fi)
BE (1) BE699022A (fi)
DE (1) DE1506532C3 (fi)
DK (1) DK115005B (fi)
ES (1) ES340963A1 (fi)
FI (1) FI46832C (fi)
GB (1) GB1116020A (fi)
NL (1) NL156367B (fi)
NO (1) NO124986B (fi)
SE (1) SE309664B (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538848A (en) * 1982-11-12 1985-09-03 Nemag B.V. Grab

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL159934C (nl) * 1967-08-16 1982-03-16 Nemag Nv Grijper met twee, via paren plaatvormige draagarmen, onderling scharnierbaar verbonden bakken.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538848A (en) * 1982-11-12 1985-09-03 Nemag B.V. Grab

Also Published As

Publication number Publication date
NO124986B (fi) 1972-07-03
ES340963A1 (es) 1968-09-16
NL6607301A (fi) 1967-11-27
DE1506532B2 (de) 1979-07-26
NL156367B (nl) 1978-04-17
DE1506532C3 (de) 1980-03-27
GB1116020A (en) 1968-06-06
DK115005B (da) 1969-08-25
DE1506532A1 (de) 1969-07-24
SE309664B (fi) 1969-03-31
FI46832B (fi) 1973-04-02
FI46832C (fi) 1973-07-10
BE699022A (fi) 1967-11-03

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