EP0348010A1 - Pincer grab - Google Patents
Pincer grab Download PDFInfo
- Publication number
- EP0348010A1 EP0348010A1 EP19890201648 EP89201648A EP0348010A1 EP 0348010 A1 EP0348010 A1 EP 0348010A1 EP 19890201648 EP19890201648 EP 19890201648 EP 89201648 A EP89201648 A EP 89201648A EP 0348010 A1 EP0348010 A1 EP 0348010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jaws
- grab
- drive unit
- pincer
- 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.)
- Granted
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 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 energising unit, for example a source for a medium under pressure; and transmission means which are arranged between the drive unit and the jaws; whereby the disposition is such that through suitable energising of the drive unit the jaws can be moved between a closed position, wherein they together form a grab, and an open position.
- the invention has for its object to embody a pincer grab such that the problems described above do not occur.
- the pincer grab according to the invention displays to this end the feature that the transmission means are arranged such that the forces produced by the drive unit in a vertical plane are transmitted in substantially that same vertical plane onto the jaws, such that no or only negligible torsion can occur in the transmission means. With this construction the weak link in the chain is eliminated and the total pincer grab can be lighter whilst an improved force transmission is nevertheless achieved.
- the transmission means comprise at least two pairs of transmission arms bearing the jaws, each disposed symmetrically in relation to the vertical central transverse plane of the jaws.
- a comparatively light and nevertheless mechanically strong and stiff construction is achieved with a variant whereof the transmission arms have considerably larger dimensions in a vertical plane than transversely thereof, such that the arms possess an increased stiffness and mechanical strength in the plane in which the forces are transmitted.
- 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 figures 1, 2 and 3 show a pincer grab 1 in a first embodiment.
- This comprises a frame 2 with attachment means 3 for coupling to a hoisting device (not drawn).
- the pincer grab 1 further comprises two jaws 6, 7 carried by the frame 2 and pivotable around mutually parallel horizontal shafts 4, 5, said jaws having complementary edges 8, 9 facing one another such that the jaws 6, 7 can together form a closed grab in the manner clearly indicated in fig. 1.
- the pincer grab 1 further comprises a hydraulic cylinder 10 with connections 11 for coupling to a controllable source for hydraulic oil.
- 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.
- Fig. 4 shows a pincer grab 24 in side view.
- 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 the reference numeral 26.
- This jaw 26 is carried by two transmission arms 27, 28. These arms 27, 28 are situated on the lengthwise ends of the jaw 26. Hydraulic cylinders 128, 129 transmit the forces generated thereby onto the transmission arm 28 via transmission arms 30, 31 (see also fig. 5) which are connected to the hydraulic cylinder 129 by means of a pivot joint 32.
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)
Abstract
a frame (2) with attachment means (3) for coupling to a hoisting device;
two jaws (6,7) carried by that frame (2) 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 (11) for coupling to a controllable energising unit, for example a source for a medium under pressure; and
transmission means (14,15,16,17,18,19) which are arranged between the drive unit and the jaws;
whereby the disposition is such that through suitable energising of the drive unit the jaws can be moved between a closed position, wherein they together form a grab, and an open position.
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 energising unit, for example a source for a medium under pressure; and
transmission means which are arranged between the drive unit and the jaws;
whereby the disposition is such that through suitable energising of the drive unit the jaws can be moved between a closed position, wherein they together form a grab, and an open position. - Such a pincer grab is known.
- With this known pincer grab the transmission means are embodied such that torsional forces can occur therein. The occurrence of torsional forces can have various disadvantages. Torsion is usually a phenomenon not taken into account in the design. Constructions are therefore often over-dimensioned in order empirically to reduce the consequences to a minimum. The further drawback can occur that various parts of the construction start to assume mutual positions other than those required. In addition an elastic torsion forming implies the presence of a relatively weak element in the mechanical chain and a reduced force transmission.
- The invention has for its object to embody a pincer grab such that the problems described above do not occur. The pincer grab according to the invention displays to this end the feature that the transmission means are arranged such that the forces produced by the drive unit in a vertical plane are transmitted in substantially that same vertical plane onto the jaws, such that no or only negligible torsion can occur in the transmission means. With this construction the weak link in the chain is eliminated and the total pincer grab can be lighter whilst an improved force transmission is nevertheless achieved.
- In order to ensure the desired symmetry an embodiment can display the characteristic that the transmission means comprise at least two pairs of transmission arms bearing the jaws, each disposed symmetrically in relation to the vertical central transverse plane of the jaws.
- A comparatively light and nevertheless mechanically strong and stiff construction is achieved with a variant whereof the transmission arms have considerably larger dimensions in a vertical plane than transversely thereof, such that the arms possess an increased stiffness and mechanical strength in the plane in which the forces are transmitted.
- 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 1 in a first embodiment. This comprises a
frame 2 with attachment means 3 for coupling to a hoisting device (not drawn). The pincer grab 1 further comprises twojaws frame 2 and pivotable around mutually parallelhorizontal shafts 4, 5, said jaws havingcomplementary edges jaws hydraulic 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 U-shaped coupling 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 the
hydraulic cylinder 10 via theconnections 11 thejaws 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. - 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 the
reference 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 - Attention is finally drawn to the fact that the
transmission arms jaws
Claims (4)
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 energising 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 energising of said drive unit said jaws can be moved between a closed position, wherein they together form a grab, and an open position;
characterized in that
the transmission means are 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.
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 true EP0348010A1 (en) | 1989-12-27 |
EP0348010B1 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) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0527515A1 (en) * | 1991-07-23 | 1993-02-17 | Bakker Hydraulic B.V. | Pincer grab |
DE4219352A1 (en) * | 1992-06-12 | 1993-12-16 | Alfred Kinshofer | Two-shell gripper mechanism - has shell side walls swivelable in support and has shell support side walls formed by hollow profiles |
CN105060110A (en) * | 2015-07-26 | 2015-11-18 | 安庆市港机制造有限责任公司 | Fixed-torque grab bucket |
Citations (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
Patent Citations (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 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0527515A1 (en) * | 1991-07-23 | 1993-02-17 | Bakker Hydraulic B.V. | Pincer grab |
US5297831A (en) * | 1991-07-23 | 1994-03-29 | Bakker Hydraulic B.V. | Pincer grab |
DE4219352A1 (en) * | 1992-06-12 | 1993-12-16 | Alfred Kinshofer | Two-shell gripper mechanism - has shell side walls swivelable in support and has shell support side walls formed by hollow profiles |
CN105060110A (en) * | 2015-07-26 | 2015-11-18 | 安庆市港机制造有限责任公司 | Fixed-torque grab bucket |
CN105060110B (en) * | 2015-07-26 | 2016-12-07 | 南通乐士机械有限公司 | One determines moment grab bucket |
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 |
EP0348010B1 (en) | 1994-08-31 |
DK302589D0 (en) | 1989-06-19 |
NL8801591A (en) | 1990-01-16 |
DE68917805T2 (en) | 1995-01-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7854571B1 (en) | Systems and methods for handling piles | |
EP1157925A3 (en) | Snubber thrust mount | |
CA1248057A (en) | Power lift for a lifting device | |
CA1210560A (en) | Flexible joint | |
CA1300556C (en) | Loader boom construction | |
EP0348010A1 (en) | Pincer grab | |
EP0440669A1 (en) | Rotator unit | |
US4932832A (en) | Backhoe gripping attachment | |
CA1280784C (en) | Swivel head for grapple | |
KR870008667A (en) | MULTI-JOINTED ROBOT | |
GB1596877A (en) | Vehicle frame | |
US4185945A (en) | Cylinder mounting | |
GB1561216A (en) | Flexing beam assembly | |
US4358147A (en) | Mounting and actuating apparatus for tongs | |
EP0226657A1 (en) | Apparatus for operating working element of excavator | |
US3034820A (en) | Material handling device | |
EP0882910A3 (en) | Toroidal type continuously variable transmission | |
US4175907A (en) | Shovel linkage | |
CA2053910A1 (en) | Crane | |
GB2082142A (en) | Dual function gripper for refuse containers | |
US4792006A (en) | Drive shaft coupling | |
JP2002513451A (en) | Frame assembly for construction machinery | |
UST984004I4 (en) | Grader blade actuator | |
JP2724138B2 (en) | Coupling device | |
SU1686063A1 (en) | Device for connecting links of rod of hydraulic gate |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE ES FR GB IT LU NL SE |
|
17P | Request for examination filed |
Effective date: 19900614 |
|
17Q | First examination report despatched |
Effective date: 19901128 |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: BAKKER HYDRAULIC B.V. |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO INGG. FISCHETTI & WEBER |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE ES FR GB IT LU NL SE |
|
REF | Corresponds to: |
Ref document number: 68917805 Country of ref document: DE Date of ref document: 19941006 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2058474 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
EAL | Se: european patent in force in sweden |
Ref document number: 89201648.6 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20020530 Year of fee payment: 14 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030621 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 20030729 Year of fee payment: 15 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20030621 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040621 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20040625 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20040629 Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20040630 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050621 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050622 Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050622 |
|
EUG | Se: european patent has lapsed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060228 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20060228 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20060629 Year of fee payment: 18 Ref country code: DE Payment date: 20060629 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20060630 Year of fee payment: 18 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20050622 |
|
BERE | Be: lapsed |
Owner name: *BAKKER HYDRAULIC B.V. Effective date: 20070630 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20080101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080101 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080101 |