EP1386878B1 - Hydraulic stone grab with means to incite additional functions - Google Patents

Hydraulic stone grab with means to incite additional functions Download PDF

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Publication number
EP1386878B1
EP1386878B1 EP03077162A EP03077162A EP1386878B1 EP 1386878 B1 EP1386878 B1 EP 1386878B1 EP 03077162 A EP03077162 A EP 03077162A EP 03077162 A EP03077162 A EP 03077162A EP 1386878 B1 EP1386878 B1 EP 1386878B1
Authority
EP
European Patent Office
Prior art keywords
grab
hydraulic
slidable part
stone grab
clamp
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
EP03077162A
Other languages
German (de)
French (fr)
Other versions
EP1386878A1 (en
Inventor
Joseph Jacobus Kennis
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP1386878A1 publication Critical patent/EP1386878A1/en
Application granted granted Critical
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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
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
    • B66C1/445—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated
    • B66C1/447—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated by hydraulic or pneumatic motors

Definitions

  • the invention concerns a stone grab of the type where with a hydraulic cylinder a packet stones or such is clamped to be transported.
  • This type is especially used with hydraulic cranes.
  • the stone grab is adjustable.
  • a part is expandable where the adjustment is fixed with lock pins.
  • the invention contains a solution where with auxiliary cylinders the lock pins are operated where no extra hydraulic components have to be added to the crane or suspension.
  • An often used type grab has in the hydraulic rotator a connection for the supply and discharge conduit for the clamping cylinder. To operate the stone grab according to the invention the existing connections and operation valves can be used.
  • auxiliary cylinders To operate the auxiliary cylinders there is a slidable mechanism installed where conduits of the clamping cylinder are switched to one of the lock pins and after that served from the operator seat.
  • the width of the grab is set with the help of the clamping cylinder and after that the lock pin is reset after switching over.
  • the switching over is accomplished by placing the stone grab on the ground and lower the crane some centimetres after that.
  • the rotator will be disconnected and can rotate free by which the rotator operates the slidable part with a cam the switching valves.
  • By turning the rotator into the lifting position and lift the stone grab the clamping cylinder will be activated for clamping the packet stones and the stone grab is rotating fixed to the rotator.
  • Fig. 1 is with (1) the stone grab indicated.
  • Stone grab (1) is connected to the crane with swing (2) on rotator (3).
  • Stone grab (1) has near the suspension switching mechanism (4) in which are located the hydraulic valves (5) and (6).
  • the adjustment mechanism (7) is suspended by rods (8).
  • Clamping cylinder (9) is connected with clamping arms (10) which pivot around pivots (11).
  • In adjustment mechanism (7) are two lock pin cylinders (12) which are double acting and each is foreseen with two lock pins (13).
  • the adjustment mechanism consists of two hollow profiles (14) having inside draw bars (15) with borings (16). By adjusting the draw bars (15) the length can be adjusted.
  • the switching mechanism (4) is connected to slidable part (17) with suspension eye (18).
  • Slidable part (17) is foreseen with coupling plate (19).
  • Coupling plate (19) is oblong and is locked in the lifting position by plates (20) which have fitting notches.
  • Between suspension eye (18) and coupling plate (19) is a cylindric part (21) which permits axial movement and rotating in switching mechanism (4).
  • Cam (22) is connected to coupling plate (19) which can operate valves (5) and (6) on rotating slidable part (17).
  • Cam member (22) has such a position that in lifting position valves (5) and (6) are in point of departure.
  • Fig. 6 the hydraulic diagram is given.
  • Conduit (23) to press out cylinder (9) goes via valve (5) and valve (6) where in point of departure the connection is open.
  • the return conduit (24) is connected with the return conduits of lock pin cylinders (12).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Earth Drilling (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The clamp is suspended from a connecting part (17) which can be rotated when retracted. At least one hydraulic switching valve (5, 6) in the clamp can be operated by a cam. The locking pin for altering the size of the clamp, depending on the size of the brick package being handled, is manipulated by lowering the clamp to the floor and allowing the crane to drop several centimetres, which disengages the rotary part (3) of the crane and allows it to rotate freely in order to operate the cam for the switching valve. The rotary part is then rotated into the lifting position and the clamp is raised, causing the clamp cylinder (9) to be activated for picking up the brick package.

Description

  • The invention concerns a stone grab of the type where with a hydraulic cylinder a packet stones or such is clamped to be transported. This type is especially used with hydraulic cranes.
    Because the to be transported packets differ in dimension the stone grab is adjustable. For this purpose a part is expandable where the adjustment is fixed with lock pins. These lock pins are removed by hand , after which with the hydraulic clamping cylinder will be adjusted and then the lock pins are reset by hand and locked.
    This operation requires manual effort and walking from the operator seat to the grab and visa versa causes a considerable interruption of the labour.
  • The invention contains a solution where with auxiliary cylinders the lock pins are operated where no extra hydraulic components have to be added to the crane or suspension. An often used type grab has in the hydraulic rotator a connection for the supply and discharge conduit for the clamping cylinder. To operate the stone grab according to the invention the existing connections and operation valves can be used.
  • To operate the auxiliary cylinders there is a slidable mechanism installed where conduits of the clamping cylinder are switched to one of the lock pins and after that served from the operator seat. The width of the grab is set with the help of the clamping cylinder and after that the lock pin is reset after switching over. The switching over is accomplished by placing the stone grab on the ground and lower the crane some centimetres after that. The rotator will be disconnected and can rotate free by which the rotator operates the slidable part with a cam the switching valves. By turning the rotator into the lifting position and lift the stone grab the clamping cylinder will be activated for clamping the packet stones and the stone grab is rotating fixed to the rotator.
  • The invention will be explained with the help of the drawing.
  • Fig. 1 shows partly in cross section the stone grab on the side.
  • Fig. 2 shows in cross section the switching mechanism in switching position.
  • Fig. 3 shows in cross section the switching mechanism in lifting position.
  • Fig. 4 shows cross section IV-IV
  • Fig. 5 shows cross section V-V.
  • Fig. 6 shows the hydraulic diagram according to the invention.
  • Fig. 7 shows the mechanism for adjustment.
  • Fig. 8 shows a cross section over the lock pin.
  • Fig. 9 shows schematic a mechanical operation of the lock pins in closed position
  • Fig. 10 shows the mechanical operation in the position where two lock pins are retracted.
  • In Fig. 1 is with (1) the stone grab indicated. Stone grab (1) is connected to the crane with swing (2) on rotator (3). Stone grab (1) has near the suspension switching mechanism (4) in which are located the hydraulic valves (5) and (6). The adjustment mechanism (7) is suspended by rods (8). Clamping cylinder (9) is connected with clamping arms (10) which pivot around pivots (11). In adjustment mechanism (7) are two lock pin cylinders (12) which are double acting and each is foreseen with two lock pins (13).
    The adjustment mechanism consists of two hollow profiles (14) having inside draw bars (15) with borings (16). By adjusting the draw bars (15) the length can be adjusted.
  • The switching mechanism (4) is connected to slidable part (17) with suspension eye (18). Slidable part (17) is foreseen with coupling plate (19). Coupling plate (19) is oblong and is locked in the lifting position by plates (20) which have fitting notches. Between suspension eye (18) and coupling plate (19) is a cylindric part (21) which permits axial movement and rotating in switching mechanism (4). Cam (22) is connected to coupling plate (19) which can operate valves (5) and (6) on rotating slidable part (17). Cam member (22) has such a position that in lifting position valves (5) and (6) are in point of departure.
    In Fig. 6 the hydraulic diagram is given. Conduit (23) to press out cylinder (9) goes via valve (5) and valve (6) where in point of departure the connection is open. The return conduit (24) is connected with the return conduits of lock pin cylinders (12). When valve (5) or (6) is activated conduit (23) is closed and connected with conduit (25) or (26) with lock pin (12) and are operated by the operating handles of clamping cylinder (9)
  • For keeping stone grab (1) in balance it is necessary to have the same adjustment on both sides.
  • The procedure is as follows:
  • The stone grab (1) is placed on the ground.
  • The arm of the crane is lowered.
  • With the rotator (3) slidable part (17) is turned a quarter turn so that valve (5) is activated.
  • With the handle of clamping cylinder (9) draw bars (15) are made free with lock pin cylinder
  • With the rotator (3) slidable part (17) is returned in the departing position. (12).
  • With the handle of the clamping cylinder (9) the stone grab (1) is set on the correct clamping width.
  • With the rotator (3) slidable part (17) is turned a quarter turn so that valve (5) is activated.
  • With the handle of the clamping cylinder (9) draw bars (15) are secured with lock pin cylinder (12).
  • With the rotator (3) slidable part (17) is returned in the departing position.
    • To adjust the other draw bars (15) the same procedure is executed with the help of valve (6).
    After adjustment coupling plate (19) is lifted and locked between plates (20) by lifting the stone grab (1).
    The mechanical version requires only turning of slidable part (17) to set a set of lock pins (13) free where at the returning the lock pins (13) come to position.

Claims (4)

  1. Hydraulic stone grab comprising a rotating element enabling connection of the grab to a mobile hydraulic crane, the grab further comprising a switching mechanism (4) for switching from one mode of operation to another mode of operation, both modes of operation utilising a hydraulic circuit characterised in that the switching mechanism comprises a slidable part (17) comprising at its lower end a cam member (22), said slidable part being slidable relative to a box member of the switching mechanism (4), and when the slidable part is in the slided-in position, position in which it is located within the housing the cam activates one or more valves (5, 6) for switching from a principal mode to an additional mode of operation by rotation of the slidable part (17).
  2. Hydraulic stone grab according to claim 1 characterised in that the slidable part (17) is foreseen with a suspension eye (18) and an oblong plate (19) which at the slided-in position comes free from notches in a plate (20), wherein by rotation of the slidable part (17) the cam member (22) activates the one or more valves (5, 6).
  3. Hydraulic stone grab according to claim 1 or 2 characterised in that the stone grab (1) is foreseen with an adjusting mechanism, wherein draw bars (15) in a hollow profile (14) are locked with lock pins (13) which are activated by cylinders (12)
  4. Hydraulic stone grab according to any of claims 1, 2 or 3 characterised in that in use the slidable part (17) is slided-in by placing the stone grab (1) on the ground and lowering the crane.
EP03077162A 2002-07-31 2003-07-10 Hydraulic stone grab with means to incite additional functions Expired - Lifetime EP1386878B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1021187 2002-07-31
NL1021187A NL1021187C2 (en) 2002-07-31 2002-07-31 Hydraulic brick clamp connectable to mobile hydraulic crane, has locking pin position changed using cam operated hydraulic switching valve

Publications (2)

Publication Number Publication Date
EP1386878A1 EP1386878A1 (en) 2004-02-04
EP1386878B1 true EP1386878B1 (en) 2004-11-03

Family

ID=27607218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03077162A Expired - Lifetime EP1386878B1 (en) 2002-07-31 2003-07-10 Hydraulic stone grab with means to incite additional functions

Country Status (4)

Country Link
EP (1) EP1386878B1 (en)
AT (1) ATE281399T1 (en)
DE (1) DE60300132D1 (en)
NL (1) NL1021187C2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101979307B (en) * 2010-10-14 2012-08-08 三一汽车起重机械有限公司 Single-cylinder pin plugging/unplugging mechanism for telescopic crane
CN102718128A (en) * 2012-06-19 2012-10-10 田利新 Synchronizing mechanism for heavy manipulator
CN102815551A (en) * 2012-08-03 2012-12-12 安徽省池州市盛大专用车装备制造有限公司 Gripper for loading and unloading stacked bricks
CN103626028B (en) * 2013-11-05 2016-06-08 江苏多元机械有限公司 A kind of unpowered fixture
CN105366537A (en) * 2015-11-17 2016-03-02 盐城苏工高科机械有限公司 Hydraulic clamping jaw of heavy type lifting device
CN105398952B (en) * 2015-11-30 2017-09-26 江苏多元机械有限公司 A kind of finished product is laid bricks fixture
CN106946151B (en) * 2017-03-16 2018-05-25 昆明理工大学 A kind of hydraulic clamp

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370528A (en) * 1942-07-15 1945-02-27 Robert A Fontaine Material handling device
US2564357A (en) * 1947-03-15 1951-08-14 Albert R Falkner Moving means for building blocks
FR2159342A1 (en) * 1972-11-06 1973-06-22 Brun Paul Le
GB1556369A (en) * 1976-12-14 1979-11-21 Hy Mac Ltd Grabs
DE29717320U1 (en) * 1997-09-27 1998-01-08 Hermann Steinweg Kg Baumaschin Device for gripping and lifting stacks, in particular stone stacks

Also Published As

Publication number Publication date
NL1021187C2 (en) 2003-06-06
ATE281399T1 (en) 2004-11-15
DE60300132D1 (en) 2004-12-09
EP1386878A1 (en) 2004-02-04

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