EP0348010B1 - Pincer grab - Google Patents
Pincer grab Download PDFInfo
- Publication number
- EP0348010B1 EP0348010B1 EP19890201648 EP89201648A EP0348010B1 EP 0348010 B1 EP0348010 B1 EP 0348010B1 EP 19890201648 EP19890201648 EP 19890201648 EP 89201648 A EP89201648 A EP 89201648A EP 0348010 B1 EP0348010 B1 EP 0348010B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jaws
- transmission
- grab
- drive unit
- coupling
- 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
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
- B66C3/14—Grabs opened or closed by driving motors thereon
- B66C3/16—Grabs opened or closed by driving motors thereon by fluid motors
Definitions
- the drive unit comprises at least one pressure cylinder, the ends of which are coupled by means of two at least more or less U-shaped coupling members to two respective pairs of transmission arms, each connected to a jaw.
- the active ends of the pressure cylinder transmit the force generated thereby onto the transmission arms at an axial distance relative to the pivot centre line. The tensile and pressure forces occurring can be absorbed easily using simple mechanical constructions.
- the pincer grab 1 will be further apparent without explanation.
- the jaws 6, 7 can pivot around the shafts 4, 5 between the closed position shown particularly clearly in fig. 1 in which they together form a grab and a desired open position.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Manipulator (AREA)
- Earth Drilling (AREA)
- Jigs For Machine Tools (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Description
- The invention relates to a pincer grab, comprising:
a frame with attachment means for coupling to a hoisting device;
two jaws carried by that frame and pivotable around mutually parallel horizontal centre lines, which jaws have complementary edges facing one another and which can together form a grab;
a drive unit, for example at least one hydraulic cylinder, with coupling means for coupling to a controllable energizing unit, for example a source for a medium under pressure; and
transmission means which are arranged between said drive unit and said jaws;
whereby the disposition is such that through suitable energizing of said drive unit said jaws can be moved between a closed position, wherein they together form a grab, and an open position;
the transmission means being arranged such that the forces produced in a vertical plane by the drive unit are transmitted in substantially that same vertical plane onto the jaws, such that no or only negligible torsion can occur in said transmission means,
the transmission means comprise at least two pairs of transmission arms bearing the respective jaws, each pair being disposed symmetrically in relation to the vertical central transverse plane of said jaws. - Such a pincer grab is known from DE-A-2 536 709. According to this prior art the transmission of forces by means of coupling means can take place only for such that be respective steps forming part of the transmission arms transmit the pitching forces via a sight-surface to the abutting sight-surface of the next-following plate. Due to this structural arrangement it cannot be avoided that the force transmission does not take place in one single verticle plane, but rather from the one plate part to the next-following plate part. Such a force transmission necessarily causes a sheer stress between the related plate parts. The occurance of the torsional forces in this prior art structure can have various disadvantages. Torsion is usually a phenomenon not taken into account in the design. Constructions are therefore often over-dimensioned in order to empirically reduce the consequences to a minimum. The further drawback can occur that various parts of the construction start to assume mutual positions different from those required. In additionan elastic torsion implies the presence of a relatively weak element in the mechanical chain and a consequently reduced force transmission.
- It is a purpose of the invention to provide a pincer grab free of these defects of the prior art.
- In order to realise this purpose the pincer grab of the invention is characterized in that each transmission arm is a flat plate having considerably larger dimensions in its vertical plane than transversely thereof.
- A further elaboration of the latter two embodiments displays the special feature that the drive unit comprises at least one pressure cylinder, the ends of which are coupled by means of two at least more or less U-shaped coupling members to two respective pairs of transmission arms, each connected to a jaw. Thus achieved with this variant in a very simple manner and without the occurrence of torsion is that the active ends of the pressure cylinder transmit the force generated thereby onto the transmission arms at an axial distance relative to the pivot centre line. The tensile and pressure forces occurring can be absorbed easily using simple mechanical constructions.
- The invention will now be elucidated with reference to the drawing of several embodiments to which the invention is not limited. In the drawing:
- fig. 1 shows a side view, partly along the cross section I-I as in fig. 2, of a pincer grab according to the invention;
- fig. 2 shows a top view;
- fig. 3 shows a side view;
- fig. 4 shows a frontal view of an alternative; and
- fig. 5 shows the detail V of fig. 4.
- The figures 1, 2 and 3 show a pincer grab I in a first embodiment. This comprises a
frame 2 with attachment means 3 for coupling to a hoisting device (not drawn). Thepincer grab 1 further comprises twojaws 6, 7 carried by theframe 2 and pivotable around mutually parallelhorizontal shafts 4, 5, said jaws havingcomplementary edges jaws 6, 7 can together form a closed grab in the manner clearly indicated in fig. 1. Thepincer grab 1 further comprises ahydraulic cylinder 10 withconnections 11 for coupling to a controllable source for hydraulic oil. - Extending between the
ends hydraulic cylinder 10 on the one side andtransmission arms jaws 6 and 7 respectively, on the other are U-shapedcoupling members hydraulic cylinder 10 onto thetransmission arms respective pivot joints - From the figures 1, 2 and 3 it will be apparent that the forces generated by the
drive unit transmission arms - The operation of the
pincer grab 1 will be further apparent without explanation. Through a suitable energising of thehydraulic cylinder 10 via theconnections 11 thejaws 6, 7 can pivot around theshafts 4, 5 between the closed position shown particularly clearly in fig. 1 in which they together form a grab and a desired open position. - Fig. 4 shows a
pincer grab 24 in side view. In this figure the elements which correspond with those according to figures 1, 2 and 3 are indicated with the same reference numerals as therein. These elements will therefore not be further discussed. - The
pincer grab 24 bears two jaws, only one of which is drawn. This has thereference numeral 26. Thisjaw 26 is carried by twotransmission arms arms jaw 26.Hydraulic cylinders transmission arm 28 viatransmission arms 30, 31 (see also fig. 5) which are connected to thehydraulic cylinder 129 by means of apivot joint 32. - The embodiment according to fig. 4 therefore comprises, at variance with the embodiment according to figures 1, 2 and 3, two
hydraulic cylinders coupling members - With respect to the embodiment as in the figures 1, 2 and 3 attention is further drawn to the presence of a
coupling arm 33 which is connected for pivoting with thetransmission arms pivot shafts 4, 5. A symmetrical movement of thejaws 6, 7 is thereby always assured. - Attention is finally drawn to the fact that the
transmission arms jaws
Claims (2)
- Pincer grab (1), comprising:
a frame with attachment means for coupling to a hoisting device;
two jaws (6,7) carried by that frame and pivotable around mutually parallel horizontal centre lines, (4,5), which jaws have complementary edges (8,9) facing one another and which can together form a grab;
a drive unit, for example at least one hydraulic cylinder (10), with coupling means for coupling to a controllable energizing unit, for example a source for a medium under pressure; and
transmission means (14,15 ; 16,17) which are arranged between said drive unit (10) and said jaws (6,7);
whereby the disposition is such that through suitable energizing of said drive unit (10) said jaws (6,7) can be moved between a closed position, wherein they together form a grab, and an open position;
the transmission means being arranged such that the forces produced in a vertical plane by the drive unit are transmitted in substantially that same vertical plane onto the jaws, such that no or only negligible torsion can occur in said transmission means,
the transmission means comprise at least two pairs of transmission arms (14,15 ; 16,17) bearing the respective jaws (3,4), each pair being disposed symmetrically in relation to the vertical central transverse plane of said jaws,
characterized in that each transmission arm (14,15 ; 16,17) is a flat plate having considerably larger dimensions in its vertical plane than transversely thereof. - Pincer grab as claimed in claim 1, characterized in that the drive unit comprises at least one pressure cylinder (10), the ends of which are coupled by means of two at least more or less U-shaped coupling members (18,19) to two respective pairs of transmission arms (14,15 ; 16,17), each connected to a jaw (6,7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8801591A NL8801591A (en) | 1988-06-22 | 1988-06-22 | PINCH BIN. |
NL8801591 | 1988-06-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0348010A1 EP0348010A1 (en) | 1989-12-27 |
EP0348010B1 true EP0348010B1 (en) | 1994-08-31 |
Family
ID=19852505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890201648 Expired - Lifetime EP0348010B1 (en) | 1988-06-22 | 1989-06-21 | Pincer grab |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0348010B1 (en) |
DE (1) | DE68917805T2 (en) |
DK (1) | DK172593B1 (en) |
ES (1) | ES2058474T3 (en) |
NL (1) | NL8801591A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5297831A (en) * | 1991-07-23 | 1994-03-29 | Bakker Hydraulic B.V. | Pincer grab |
DE4219352C2 (en) * | 1992-06-12 | 1995-01-05 | Alfred Kinshofer | Clamshell buckets |
CN105060110B (en) * | 2015-07-26 | 2016-12-07 | 南通乐士机械有限公司 | One determines moment grab bucket |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2622915A (en) * | 1950-03-24 | 1952-12-23 | Horn Mfg Company | Grapple fork |
DE1127560B (en) * | 1959-08-27 | 1962-04-12 | Alfawerk Foerderanlagen G M B | Hydraulic grab |
FR1354668A (en) * | 1963-04-17 | 1964-03-06 | Schwermaschb Kirow Veb | Articulated elbow, in particular for electro-hydraulic clamshells |
US3641689A (en) * | 1969-07-07 | 1972-02-15 | Billings R O | Hydraulically actuated clamshell buckets |
DE2536709A1 (en) * | 1975-08-18 | 1977-03-03 | Alfred Kinshofer | Hydraulic twin:jaw grab - has one jaw lever supported on ram rod clear of cylinder with other levers |
US4405167A (en) * | 1981-03-02 | 1983-09-20 | Alfred Kinshofer | Clamshell |
-
1988
- 1988-06-22 NL NL8801591A patent/NL8801591A/en not_active Application Discontinuation
-
1989
- 1989-06-19 DK DK302589A patent/DK172593B1/en not_active IP Right Cessation
- 1989-06-21 EP EP19890201648 patent/EP0348010B1/en not_active Expired - Lifetime
- 1989-06-21 DE DE1989617805 patent/DE68917805T2/en not_active Expired - Fee Related
- 1989-06-21 ES ES89201648T patent/ES2058474T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE68917805D1 (en) | 1994-10-06 |
DK302589A (en) | 1989-12-23 |
DK172593B1 (en) | 1999-02-08 |
ES2058474T3 (en) | 1994-11-01 |
EP0348010A1 (en) | 1989-12-27 |
DK302589D0 (en) | 1989-06-19 |
NL8801591A (en) | 1990-01-16 |
DE68917805T2 (en) | 1995-01-05 |
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