EP0364728B1 - Hebeklemme - Google Patents

Hebeklemme Download PDF

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Publication number
EP0364728B1
EP0364728B1 EP89116719A EP89116719A EP0364728B1 EP 0364728 B1 EP0364728 B1 EP 0364728B1 EP 89116719 A EP89116719 A EP 89116719A EP 89116719 A EP89116719 A EP 89116719A EP 0364728 B1 EP0364728 B1 EP 0364728B1
Authority
EP
European Patent Office
Prior art keywords
spindle
spindle part
jaw
lifting clamp
clamp according
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
EP89116719A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0364728A1 (de
Inventor
Willy Schwenger
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.)
Carl Stahl GmbH
Original Assignee
Carl Stahl GmbH
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 Carl Stahl GmbH filed Critical Carl Stahl GmbH
Priority to AT89116719T priority Critical patent/ATE82940T1/de
Publication of EP0364728A1 publication Critical patent/EP0364728A1/de
Application granted granted Critical
Publication of EP0364728B1 publication Critical patent/EP0364728B1/de
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
    • B66C1/48—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces to vertical edge portions of sheets, tubes, or like thin or thin-walled articles

Definitions

  • the invention relates to a lifting clamp with the features of the preamble of claim 1.
  • a generic lifting clamp is previously known from US-A-3 269 766. Such lifting clamps serve as load suspension means for transporting metal sheets, welded structures, machine bodies or the like.
  • a one-piece spindle is rotatably mounted in the clamp body as a device for moving the jaw.
  • the protrusion of that part of the spindle via which the spindle can be driven for the movement of the jaw and which protrudes from the lifting body on the side of the clamp body facing away from the load receiving space is correspondingly large if the distance the two jaws are large to each other.
  • the spindle of the known lifting clamp has a ball head on its end protruding into the load receiving space, on which the jaw is pivotably arranged. This ensures that under load, that is, if a part, for example a sheet metal plate, is clamped between the two opposing jaws and is lifted off the floor by means of the lifting clamp, the pivotable jaw is pivoted downwards under the load and thereby the clamping gap between them opposite jaws shortened, which leads to an increased clamping of the picked up goods in the clamping gap.
  • the greater the weight of the lifting good that is clamped between the two jaws the greater the tendency of the adjustable jaw to pivot downwards and the greater the clamping or holding force between the two opposing jaws. This leads to an increase in safety when using such lifting clamps.
  • an adjusting spindle which is used in clamping and measuring devices.
  • the adjusting spindle is designed in two parts, its first spindle part being rotatably mounted in the clamp body and the second spindle part being guided longitudinally in the first spindle part and being drivable by it. Thanks to the adjustment spindle designed in this way, the movable jaw for holding a workpiece or an object to be measured can be set faster than is the case with one-piece spindles.
  • These known tensioning and measuring devices which have the two-part adjusting spindle, are not intended for lifting and transporting loads and are also not suitable for this.
  • the invention has for its object to provide a lifting clamp in which a more compact design can be achieved with safe operation of the same, in order to increase the possible uses for lifting clamps.
  • This object is achieved by a lifting clamp with the features of claim 1.
  • the fact that in a lifting clamp according to the characterizing part of claim 1 instead of a one-piece spindle according to the prior art as an apparatus for moving the jaw, an at least two-part spindle can be used can be by means of a rotational movement of the first spindle part of the two-part spindle, which is rotatably mounted in the clamp body, the inside of the load receiving space of the lifting clamp for clamping or releasing a good to be transported, second spindle part which can be moved forwards or backwards with the jaw, which is guided longitudinally in the first spindle part and can be driven by it, telescopically extend or retract from it.
  • the second spindle part has the ball head with the pivotable jaw, in addition to the advantage of the smaller overhang of the spindle, full safety is achieved in the lifting clamp according to the invention by shortening the clamping gap as in the known lifting clamp.
  • the movement path of the movable jaw runs in a straight line, preferably in a horizontal plane.
  • the second spindle part has an external thread for guiding in an internal thread of the first spindle part and the first spindle part has an external thread for guiding in a continuous internal thread of the clamping body, the external thread of the first spindle part and that of the second spindle part are opposed to each other.
  • all threads of the spindle drive used have approximately the same thread pitch.
  • the two-part spindle according to the invention achieves a travel of twice the distance covered by the movable jaw with one spindle revolution than with the lifting clamps according to the prior art with only one spindle drive and comparable thread pitch. Furthermore, this means that in the lifting clamp according to the invention, the clamping gap formed by the two jaws can be increased or decreased in half the time compared to what has been known to date.
  • the first spindle part is rotatable but axially immovable, preferably by means of a bushing, which runs parallel to the path of movement of the movable jaw in the clamp body, in this in the clamp body.
  • the second spindle part can be driven and moved without the first spindle part executing such an axial movement.
  • a constant and very small protrusion of the end of the two-part spindle facing away from the load receiving space from the clamp body can be achieved, which can be advantageous when the lifting clamp is used in particularly confined spaces.
  • the second part of the spindle with the jaw then behaves with regard to the distance that can be covered and the time required for this, just as with a one-piece spindle with a comparable thread pitch.
  • the two-part spindle has an anti-twist protection which secures the two spindle parts against mutual twisting. It is hereby achieved that when driving, i.e. the rotation of the first spindle part, the second spindle part is not carried along during the rotary movement by frictional forces between the threads of the first and second spindle parts, which could prevent the jaw to be moved from moving to or away from the opposite jaw, but rather from the rotational movement of the first spindle part positively coupled via the anti-rotation protection in any case results in a corresponding feed movement of the second spindle part with the jaw.
  • the adjustable and pivotable jaw is convex on its side facing the opposite jaw, the radius of curvature the convex side of the jaw is larger than the pivot radius of the jaw when pivoting the same on the ball head. This leads to a further increase in safety when using the lifting clamp according to the invention.
  • an actuating member in the form of a star grip is provided for driving the first spindle part of the two-part spindle.
  • a star grip enables the spindle of the lifting clamp to be opened and closed quickly and powerfully.
  • the actuating member is usually a spindle mandrel, which is only supplied loosely with the respective lifting clamp and which can be used to open or close the lifting clamp, i.e. to rotate the one-piece spindle, into the end of the load receiving space opposite the same for the rotary movement. The result of this is that this spindle mandrel can be lost very easily and that the known lifting clamps can then only be opened or closed using other tools.
  • the spindle mandrel is firmly connected to the end of the one-piece spindle of the known lifting clamp, this entails the risk that the lifting clamp will itself unintentionally opens by itself, especially if this mandrel protrudes below the lifting clamp in its closed position for clamping a good to be transported, so that when the good is set down, this mandrel can be actuated, for example by placing the lifting clamp on another adjacent plate stack, and the The lifting clamp opens automatically to let go of the goods.
  • the lifting clamp has a clamp body designated as a whole as 10, which is essentially C-shaped in the side view shown in the figure and which delimits a load-receiving space 12.
  • a fixed jaw 16 or a device designated as a whole by 18 is received, by means of which a movable jaw 20 can be moved towards or away from the fixed jaw 16.
  • a width-adjustable clamping gap 22 for receiving the goods to be transported is delimited by the two jaws 16 and 18.
  • a shackle 26 is rotatable on the upper side of the clamp body 10 about a bolt 24 passing through the clamp body 10, i.e. essentially a U-shaped part for receiving a load hook (not shown) ) of the crane, articulated.
  • the fixed jaw 16 is embedded in a recess 28 of the leg 14a of the clamp body 10 and is firmly connected to it via a screw connection 30.
  • the fixed jaw 16 protrudes with its side facing the movable jaw over this recess to form a flat and essentially vertical clamping surface 31 for the material to be clamped out of the recess 28.
  • the device 18 for moving the movable jaw 20 is formed from a two-part spindle 32 which has a first and a second spindle part 34 and 36, respectively.
  • the first spindle part 34 has an uninterrupted external thread 38, which is guided in a continuous internal thread 40 of the leg 14b of the clamp body 10, which is cut into a bore of the leg 14b of the clamp body 10, which runs essentially horizontally, and whose diameter corresponds to the diameter of the corresponds to the first spindle part 34 to be accommodated.
  • the external thread 38 of the first spindle part 34 has a greater length than the continuous internal thread 40 of the leg 14b of the clamp body 10.
  • first spindle part 34 Inside the first spindle part 34 there is a bore 42, the length of which is somewhat shorter than the length of the external thread 38 of the first spindle part 34.
  • An internal thread 44 is cut into this bore 42, the diameter of which corresponds to the diameter of the second spindle part 36 an external thread 46 of the second spindle part 36 is guided, which extends for the longitudinal movement of the movable jaw 20 over the entire length of the second spindle part 36.
  • the external thread 38 of the first spindle part 34 and the continuous internal thread 40 of the clamp body 10 are each a right-hand thread and the external thread 46 of the second spindle part 36 and the internal thread 44 of the first spindle part are each a left-hand thread.
  • the external thread 38 of the first spindle part 34 and the external thread 46 of the second spindle part 36 are therefore counter to one another. All threads used for the spindle drive have approximately the same thread pitch.
  • the latter has a ball head 48.
  • the movable jaw there is a recess 50 corresponding to the diameter of the ball head 48 for receiving the ball head 48, which in a known and therefore not shown manner by means of a snap ring 52 for the connection of the movable jaw 20 with the ball head 48 in this recess 50 is held.
  • the movable jaw 20 is mounted on the ball head 48 in such a way that it can be pivoted up or down by a certain amount about the ball center axis 54 running perpendicular to the plane of the drawing.
  • the side 56 of the movable jaw 20 facing the fixed jaw 16 is convex, the radius of curvature of the convex side being greater than the pivot radius of the movable jaw 20 when pivoting on the ball head 48.
  • the latter On the underside of the second spindle part 36, the latter has a holding part 58 which is fixedly connected to it and which has two ends 60a and 60b which run at right angles to one another, the end 60b running parallel to the movement path of the movable jaw 20 in a likewise longitudinal guide 62 in the leg 14b of the clamp body 10 is guided axially.
  • This holding part 58 represents an anti-rotation device that prevents the two spindle parts 34 and 36 from rotating against one another, which impairs the movement of the movable jaw 20.
  • the longitudinal guide 62 extends lengthwise through the entire leg 14b of the clamp body 10 and emerges with its two ends on the two opposite sides of the leg 14b.
  • the leg 14b has on its underside a projection 64 which protects the device 18 from damage, for example when the lifting clamp is placed on a stack of sheet metal plates, when it is lowered.
  • the latter is firmly connected to the first spindle part 34 via a pin connection 68.
  • the lifting clamp essentially works as follows: When the star grip 66 is turned to the right, i.e. clockwise as seen in the figure, the first spindle part 34 moves to the left as seen in the figure due to the right-handed threads 38 and 40 which correspond to one another, i.e. into the load-bearing space 12. Due to the left-handed threads 44 and 46, during this rotational movement of the first spindle part 34 in a clockwise direction, the second spindle part 36 is telescopically moved out of the first spindle part 34 and the movable jaw 20 is moved towards the fixed jaw 16 and thus the width of the clamping gap 22 is reduced .
  • the movable jaw 20 is pivoted downward about the axis 54, and the stronger, the greater the attached load.
  • the upper half of the convex side 56 is pivoted into the clamping gap 22, which reduces its width and leads to a secure clamping of the goods to be transported.
  • actuating element for example a toggle grip or the like
  • the outer circumference of the actuating member does not protrude beyond the underside of the clamp body 10, which could lead to its unwanted actuation and thus to the unintentional and dangerous opening of the clamp.
  • the jaw 20 movable by means of the device 18 can also be used, so that in such a lifting clamp there are two jaws which can be moved towards or away from one another in the clamp body 10 and can each be driven via the device 18.
  • the first spindle part 34 cannot be guided via the external thread 38 in the continuous internal thread 40 of the clamp body 10, but by means of a bushing (not shown) to be inserted into the clamp body 10, which holds the first spindle part axially immovable but rotatable in the clamp body 10. It is hereby achieved that the second spindle part 36 moves linearly by a rotational movement of the first spindle part 34, without an axial movement of the first spindle part 34 taking place.
  • the actuator for the spindle for example the star grip 66
  • the star grip 66 can be placed very close to the clamp body 10, which makes the protrusion of the first spindle part 34 and star grip 66 beyond the clamp body 10 very small.
  • the same number of rotary movements as in the known lifting clamps with a one-piece spindle with a comparable thread pitch must then be applied to the first spindle part in order to linearly move the second spindle part with the movable jaw 20 into the respective position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Jigs For Machine Tools (AREA)
  • Manipulator (AREA)
  • Paper (AREA)
EP89116719A 1988-10-11 1989-09-09 Hebeklemme Expired - Lifetime EP0364728B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116719T ATE82940T1 (de) 1988-10-11 1989-09-09 Hebeklemme.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8812717U 1988-10-11
DE8812717U DE8812717U1 (de) 1988-10-11 1988-10-11 Hebeklemme

Publications (2)

Publication Number Publication Date
EP0364728A1 EP0364728A1 (de) 1990-04-25
EP0364728B1 true EP0364728B1 (de) 1992-12-02

Family

ID=6828719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116719A Expired - Lifetime EP0364728B1 (de) 1988-10-11 1989-09-09 Hebeklemme

Country Status (5)

Country Link
US (1) US5005890A (fi)
EP (1) EP0364728B1 (fi)
JP (1) JPH02163286A (fi)
AT (1) ATE82940T1 (fi)
DE (2) DE8812717U1 (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013566A1 (de) * 2012-07-06 2014-05-08 Carl Stahl Gmbh Verbindungseinrichtung

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255950A (en) * 1991-11-08 1993-10-26 J.C. Renfroe And Sons, Inc. Clamp with freely rotatable coupling and associated method of rotatably manipulating a structural member
US6412767B1 (en) * 1998-03-06 2002-07-02 American Tool Companies, Inc. Clamping jaw
EP1475189A1 (en) * 2003-05-07 2004-11-10 Industrias Piqueras, S.A. Movable head for vises
US7175143B1 (en) * 2003-09-18 2007-02-13 Trang Heather Ho Portable accessory hook
US8454004B1 (en) * 2006-09-01 2013-06-04 Chick Workholding Solutions, Inc. Workholding apparatus having a movable jaw member
US8573578B1 (en) 2006-09-01 2013-11-05 Chick Workholding Solutions, Inc. Workholding apparatus
US9227303B1 (en) 2006-09-01 2016-01-05 Chick Workholding Solutions, Inc. Workholding apparatus
US8336867B1 (en) 2006-09-01 2012-12-25 Chick Workholding Solutions, Inc. Workholding apparatus having a detachable jaw plate
US8353486B2 (en) * 2008-01-21 2013-01-15 Erico International Corporation Lateral seismic brace
US20090183443A1 (en) * 2008-01-21 2009-07-23 Osborn Eric C Universal structural attachment for seismic brace
US7819448B2 (en) * 2008-03-03 2010-10-26 Cooper Brands, Inc. Plate lifting clamp
US9352451B1 (en) 2013-05-02 2016-05-31 Chick Workholding Solutions, Inc. Workholding apparatus
RU174604U1 (ru) * 2017-03-07 2017-10-23 Федеральное государственное автономное образовательное учреждение высшего образования "Северный (Арктический) федеральный университет имени М.В. Ломоносова" (САФУ) Фрикционное грузозахватное устройство
US10981261B2 (en) * 2017-07-13 2021-04-20 Indian Springs Mfg. Co. Inc. Container clamp assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269766A (en) * 1964-10-05 1966-08-30 Merrill Brothers Screw clamp with a head having a reverse-acting and renewable gripping surface

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US2370042A (en) * 1940-11-20 1945-02-20 Jesionowski John Vise
FR900785A (fr) * 1943-12-24 1945-07-09 Montures de scies et clefs
US2420002A (en) * 1944-10-23 1947-05-06 Leslie J Mckay Bench vise
US2604352A (en) * 1947-06-13 1952-07-22 Gonser Harry Aden Lift bar clamp
US2662433A (en) * 1950-02-08 1953-12-15 Caroline A Braun Device for simultaneously clamping and releasing plural workpieces
FR1099580A (fr) * 1954-02-16 1955-09-07 Dispositif permettant d'imprimer simultanément à plusieurs organes un mouvement relatif
US2919614A (en) * 1955-07-05 1960-01-05 Gen Dynamics Corp Clamping device
DE1126098B (de) * 1958-05-24 1962-03-22 Iaweseria Ag Transportklaue
FR1460024A (fr) * 1965-10-14 1966-06-17 Serre-joint
DE1812325A1 (de) * 1968-12-03 1970-07-23 Arnold Franz Mechanische Spannvorrichtung,insbesondere Maschinenschraubstock
DE2512236A1 (de) * 1975-03-20 1976-10-07 Smw Spanneinrichtungen Verstellspindel
JPS5243062A (en) * 1975-10-02 1977-04-04 Eagle Kuranpu Kk Screw type clamp
US4183571A (en) * 1976-03-04 1980-01-15 J. C. Renfroe And Sons, Inc. Screw-type lifting clamp
CH606824A5 (fi) * 1976-12-29 1978-11-15 Paul Eckli
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US4417361A (en) * 1982-05-17 1983-11-29 Guardian Products Company, Inc. Grab bar
US4850630A (en) * 1986-01-14 1989-07-25 J.C. Renfroe & Sons, Inc. Clamp with movable jaw structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269766A (en) * 1964-10-05 1966-08-30 Merrill Brothers Screw clamp with a head having a reverse-acting and renewable gripping surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013566A1 (de) * 2012-07-06 2014-05-08 Carl Stahl Gmbh Verbindungseinrichtung

Also Published As

Publication number Publication date
DE8812717U1 (de) 1988-11-24
DE58902892D1 (de) 1993-01-14
JPH02163286A (ja) 1990-06-22
US5005890A (en) 1991-04-09
ATE82940T1 (de) 1992-12-15
EP0364728A1 (de) 1990-04-25

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