EP2177319B1 - Vorrichtung zum Stoppen der Oszillation des Arms eines Handhabungsgeräts mit schwenkbarem Hebel - Google Patents

Vorrichtung zum Stoppen der Oszillation des Arms eines Handhabungsgeräts mit schwenkbarem Hebel Download PDF

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Publication number
EP2177319B1
EP2177319B1 EP09012622A EP09012622A EP2177319B1 EP 2177319 B1 EP2177319 B1 EP 2177319B1 EP 09012622 A EP09012622 A EP 09012622A EP 09012622 A EP09012622 A EP 09012622A EP 2177319 B1 EP2177319 B1 EP 2177319B1
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EP
European Patent Office
Prior art keywords
engagement member
stem
engagement
rack
arm
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.)
Active
Application number
EP09012622A
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English (en)
French (fr)
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EP2177319A1 (de
Inventor
Ener Varetto
Umberto Conte
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.)
VEP Automation Srl
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VEP Automation Srl
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Publication date
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Priority to PL09012622T priority Critical patent/PL2177319T3/pl
Publication of EP2177319A1 publication Critical patent/EP2177319A1/de
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Publication of EP2177319B1 publication Critical patent/EP2177319B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/12—Arrangements for positively actuating jaws using toggle links
    • B25B5/122—Arrangements for positively actuating jaws using toggle links with fluid drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments

Definitions

  • the present invention generally refers to handling equipments of the so-called swingable lever type. These equipments comprise a body to which a lever element is externally associated which is susceptible to oscillate between two end-of-stroke angular positions, and the movement of which is controlled by the sliding of a stem actuated by a pressurized fluid control actuator, typically of the pneumatic type, through a toggle mechanism enclosed within the body and operatively connected to an end of the stem.
  • a pressurized fluid control actuator typically of the pneumatic type
  • the lever element has the function of an arm supporting an operating unit, such as a working equipment, at its end farther from the body, in which case the handling equipment is called “tilter unit” because allows the operating unit to be tilted between two positions defined by the end-of-stroke angular positions of the arm of the equipment.
  • the invention concerns a toggle lever clamping device with a lock mechanism for stopping oscillation of the arm of said device, in which the arm is rotatably connected to a shaft that extends from a body of the equipment, the body enclosing a toggle mechanism operatively interposed between the shaft and one end of a stem axially slidable in a direction transverse to the shaft, the stem being controlled by under pressure fluid control means associated with the body, whereby sliding of the stem gives rise to an angular oscillation of the arm between two predetermined end-of-stroke angular positions.
  • Another known device which is adapted to prevent the violent fall of the arm in case of an anomaly in feeding the pressurized fluid to the control actuator is the subject of European patent application EP-1 300 625 in the name of the same Applicant.
  • the device of this application comprises stopping means that include a rotatable worm member engaging an axial cavity of the stem and having a head provided with an axial toothing facing on a corresponding toothing of a movable element axially associated to the bottom of the actuator.
  • elastic means apply a thrust on the axially movable element, thereby bringing the aforesaid toothings in mutual engagement in order to stop the movement of the stem and therefore the oscillation of the arm.
  • the invention concerns a stopping device of the type mentioned in the preamble of attached claim 1.
  • the main object of the present invention is to propose a stopping device for an handling equipment of the swingable lever type, which automatically acts when an anomaly takes place in the feeding of the pressurized fluid to the actuator in order to stop the angular movement of the arm of the equipment, and which is effective in its operation and relatively simple and inexpensive to be manufactured.
  • the facing surfaces of said engagement members are provided with projecting engagement formations of a corresponding shape.
  • the stopping device of the invention is characterized by a simple structure allowing a quick and effective stop of the swingable arm of the equipment when an anomaly takes place in the feeding of the control means. Moreover, the device is small sized thus allowing its application to the normally used equipments with few structural modifications, and involving limited production costs.
  • the engagement formations are teeth, so that each engagement member consists of a rack. In this manner the engagement formations can be made in a simple and economic manner.
  • the teeth of each rack are round-topped teeth and have substantially parallel flanks.
  • the body of a handling equipment of the swingable lever type is indicated by 10, and comprises a pair of half-shells 12 and 14 fittable to one another by means of screws or similar removable connecting means (not shown).
  • the two half-shells 12 and 14 in their mutual fitted condition, define an inner cavity in which a crank 16 is arranged, from which crank a pair of appendages extend axially and define a shaft 18 having opposite end portions 20 and 22 protruding from the sides of the body 10.
  • Each portion 20 and 22 of the shaft 18 has a pair of diametrically opposite flats 20a, 22a provided for rotationally fixing branches of an arm or lever (not shown because known per se) on the shaft 18.
  • Such arm can be used for supporting a working apparatus, in the case of an handling equipment employed as a tilter device.
  • the crank 16 has a fork-shaped portion comprising a pair of parallel arms 24 extending inside the cavity of the body 10, whose ends opposite to the shaft 18 are articulated at 26 to a first end of a connecting rod 28 through a pin.
  • the second end of the connecting rod 28 is in turn articulated at 30 to a fork element 32 by means of a pin, which fork element is articulated to the upper end (with reference to the drawings) of a stem 34 whose top portion is only shown in the drawings.
  • the stem 34 is axially slidably mounted in the body 10 in the direction transverse to the shaft 18, and its sliding is controlled by fluid control means, usually constituted by a double or single action cylinder (not shown in the drawings because known per se) connected to the base of the body 10.
  • fluid control means usually constituted by a double or single action cylinder (not shown in the drawings because known per se) connected to the base of the body 10.
  • the cylinder that controls the sliding of the stem 34 is a pneumatic cylinder having a chamber in which a piston rigidly connected to the stem 34 is sealingly and slidably mounted. In this chamber, compressed air is fed at least at one side of the piston, in order to cause the reciprocating movement of the stem 34.
  • the unit including the crank 16, the connecting rod 28 and the fork element 32 constitutes a toggle articulation mechanism, indicated 33 as a whole, the function of which is to make irreversible the position of the crank 16 and the shaft 18 which correspond to the maximum extension of the stem 34, as shown in figures 3 to 5 .
  • the sliding of the stem 34 controlled by the corresponding control means through the toggle articulation mechanism 33 causes an angular oscillation of the end portions 20 and 22 of the shaft 18 between two predetermined end-of-stroke angular positions, and therefore an oscillation of the arm fixed to the shaft 18 as well as of the relative equipment supported by the arm.
  • a bracket element 36 is connected close to the upper end of the stem 34, for example by means of a fixing pin 38.
  • An engagement member 40 is fixed to the bracket element 36 so as to be axially movable together with the stem 34.
  • the member 40 has an active surface provided with engagement formations that extend transverse to the stem 34 and preferably comprise a series of teeth 41, as a result of which the element 40 is constituted by a rack.
  • a further engagement member 42 is fixed axially to the body 10 and has an active surface facing on the teeth 41 of the rack 40.
  • the member 42 having an elongate shape is housed in a corresponding hollow seat 43 adjacent to an axial edge of the half-shell 12. Its active surface is provided with engagement formations preferably in form of teeth 41 that project in the direction transverse to the stem 34 and have a profile corresponding to those of the member 40, as result of which also the member 42 is preferably constituted by a rack.
  • the profile of the teeth 41 of the racks 40 and 42 is conveniently of the type having substantially parallel flanks and a rounded top.
  • the rack 42 has an axial extension substantially equal to the full stroke of the stem 34 and is mounted transversely translatably with respect to the stem 34, and therefore to the rack 40.
  • the rack 40 conveniently has a smaller axial extension than the rack 42.
  • the rack 40 is susceptible to move along an axial direction A-A parallel to the stem 34, while the rack 42 can translate along a direction B-B transverse to the stem 34.
  • a transverse guide pin 44 is provided, which passes through the wall of the half-shell 12 with an axial clearance.
  • the pin 44 has a normally threaded free end 44a adapted to engage a central threaded portion of the rack 42, in order to guide and bound the movement of the rack 42 with respect to the body 10.
  • the pin 44 is provided with a head projecting outside of the body 10 for being driven, typically by means of a tool such as a spanner or a screwdriver, in order to allow the fine tuning of the maximum translation of the rack 42 towards the rack 40.
  • the translation of the rack 42 towards the rack 40 is controlled by at least one actuator 46, a pair of equal actuators 46 being preferably provided at the same distance but on opposite sides with respect to the pin 44.
  • Each actuator 46 comprises an auxiliary piston 48 slidably mounted in a cylindrical seat 50 formed in the wall of the half-shell 12, which seat defines a chamber 51 on the side facing towards the rack 42.
  • a coaxial rod 52 is connected rigidly, the free end of which, on the side adjacent to the rack 42, has a threaded portion 54 engaging a corresponding thread of a transverse hole 56 of the rack 42.
  • Elastic thrust means 58 preferably consisting of a pack of Belleville washers for compactness reasons, are coaxially mounted on each auxiliary piston 48 in such a manner that a first end of them rests against the surface of the piston 48 opposite to the chamber 51, while the other end rests against a removable cover 60, normally fixed to the body 10 of the equipment.
  • the same pressurized fluid is admitted to the control means of the equipment, through ducts indicated generally by 62.
  • the actuators 46 are put in communication with one another by means of feeding ducts allowing the pressurized fluid to reach the corresponding chambers 51 simultaneously.
  • an elongate counter plate 63 is fixed to the half-shell 14, typically by means of screws, which plate is separated by a small distance from the back surface of the rack 40.
  • the pressurized fluid fed to the control means of the equipment causes, thanks to the toggle mechanism 28, the reciprocating axial movement of the stem 34 that in turn causes the rotation of the shaft 18 between a pair of predetermined end-of-stroke angular positions, and therefore the oscillation movement of an arm rotationally fixed to the shaft 18 as well as of any equipments possibly supported by it.
  • the load of the washers 58 of the actuators 46 is calculated in such a manner that the rack 42 remains spaced from the rack 40 when the pressure of the fluid in the chambers 51 is greater than a predetermined threshold.
  • the elastic action of the washers 58 causes the movement of the rods 52 towards the stem 34, and therefore the movement of the rack 42 towards the rack 40, in the direction indicated by arrow C in figure 6 .
  • the teeth 41 of the rack 42 engage frontally the teeth 41 of the rack 40 causing the stroke of the stem 34 to stop and therefore the movement of oscillation of the arm fixed to the shaft 18 to stop.
  • the rack 40 is subject only to a small transverse movement until its back surface rests against the plate 63, in such a manner that the rack 40 and the corresponding bracket element 36 are subject only to a limited bending load, and the sliding movement of the rack 40 is further slowed down owing to the engagement of its back surface with the friction elements 64 of the plate 62.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Actuator (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Stringed Musical Instruments (AREA)
  • Manipulator (AREA)

Claims (12)

  1. Kniehebel- Spannvorrichtung mit einem Sperrmechanismus zum Anhalten der Schwenkbewegung eines Armes der Vorrichtung, der drehbar mit einer Welle (18) verbunden ist, die aus einem Gehäuse (10) der Vorrichtung herausragt, welches einen Kniehebelmechanismus (33) aufnimmt, der betrieblich zwischen der Welle (18) und einem Ende einer Stange (34) angeordnet ist, die quer zu der Welle (18) axial verschiebbar und über eine im Gehäuse (10) vorgesehene Druckmittelsteuereinrichtung steuerbar ist, wobei eine Verschiebung der Stange (34) eine Winkelverstellung des Armes zwischen zwei eingestellten Winkelanschlagpositionen bewirkt, wobei der Sperrmechanismus umfasst:
    - ein erstes Eingriffselement (42), das in dem Gehäuse (10) so gelagert ist, dass es in Richtung seiner Axialerstreckung bewegungsfest ist,
    - ein zweites Eingriffselement (40), das zusammen mit der Stange (34) beweglich ist,
    - wobei die beiden Eingriffselemente (40, 42) einander gegenüberliegende, aktive Flächen haben, die so ausgelegt sind, dass sie bei einer Querbewegung des ersten Eingriffselements (42) relativ zu der Stange (34) frontal in Eingriff kommen, wenn in dem zu der Druckmittelsteuerung geleiteten Druckmedium ein Druckabfall auftritt, so dass die Verschiebung der Stange (34) unterbrochen wird, dadurch gekennzeichnet, dass die einander gegenüberliegenden Flächen der Eingriffselemente (40, 42) mit vorstehenden Eingriffsformationen (41) von einander entsprechender Gestaltung aufweisen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Eingriffsvormationen als Zähne (41) ausgebildet sind, wodurch jedes Eingriffselement eine Zahnstange (40, 42) ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Zähne (41) jeder Zahnstange (40, 42) im wesentlichen parallele Flanken sowie abgerundete Spitzen haben.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das erste Eingriffselement (42) quer zum Gehäuse (10) der Vorrichtung in Richtung auf das zweite Eingriffselement (40) verschiebbar ist und dass die Verschiebung des ersten Eingriffselementes (42) von wenigstens einem Stellorgan (46) gesteuert ist, das infolge eines Druckabfalls des Druckmediums unter einen vorbestimmten Wert aktivierbar ist, während das zweite Eingriffselement (40) starr mit der Stange (34) verbunden ist.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Erstreckung des ersten Eingriffselementes (42) im wesentlichen mit dem Axialhub der Stange (34) übereinstimmt.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Axialerstreckung des zweiten Eingriffselementes (40) kleiner ist als diejenige des ersten Eingriffselementes (42).
  7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass zur Führung der Querbewegung des ersten Eingriffselementes (42) ein Führungsbolzen (44) in dem Gehäuse (10) angeordnet ist, der sich quer zu der Stange (34) erstreckt.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Bewegung des ersten Eingriffselementes (42) durch ein Paar von Stellorgangen (46) gesteuert wird, die bezüglich des Führungsbolzens (44) auf gegenüberliegenden Seiten angeordnet sind.
  9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass jedes Stellorgan (46) einen Hilfskolben (48) hat, der in einem Zylindersitz (50) verschiebbar ist, welcher eine Kammer (51) bildet, in der sich dasselbe Druckmedium befindet, das auch zu der Steuereinrichtung der Vorrichtung geleitet wird, wobei der Hilfskolben (48) eine mit dem ersten Eingriffselement (42) verbundene Stange (52) hat, so dass bei Zuführung des Druckmediums mit ausreichendem Druck in die Kammer (51) der Hilfskolben (48) eine von dem zweiten Eingriffselement (40) beabstandete Position gegen die Wirkung von elastischen Druckmitteln (58) einnimmt, welche den Hilfskolben (48) gegen das zweite Eingriffselement (40) beaufschlagen.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die elastischen Druckmittel aus einem Tellerfederpaket (58) bestehen, dass koaxial zu dem zugehörigen Hilfskolben (48) angeordnet ist.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass sich das Tellerfederpaket (58) jedes Stellorgans (46) an einem abnehmbaren Deckel (60) abstützt, der an dem Gehäuse (10) der Vorrichtung fixierbar ist.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass diese eine längliche Gegenplatte (63) hat, die neben dem zweiten Eingriffselement (40) liegt und im Normalfall zu der Fläche des zweiten Eingriffselementes (40), die deren aktiver Fläche gegenüberliegt, einen Abstand aufweist, wobei die aktive Fläche auf ihrer dem ersten Eingriffselement (40) gegenüberliegenden Seite eine Reihe von Reibelementen (64) hat.
EP09012622A 2008-10-08 2009-10-06 Vorrichtung zum Stoppen der Oszillation des Arms eines Handhabungsgeräts mit schwenkbarem Hebel Active EP2177319B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09012622T PL2177319T3 (pl) 2008-10-08 2009-10-06 Urządzenie do zatrzymywania oscylacji ramienia urządzenia przeładunkowego z dźwignią wahadłową

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000736A ITTO20080736A1 (it) 2008-10-08 2008-10-08 Dispositivo d'arresto dell'oscillazione del braccio di un'attrezzatura di movimentazione del tipo a leva oscillabile.

Publications (2)

Publication Number Publication Date
EP2177319A1 EP2177319A1 (de) 2010-04-21
EP2177319B1 true EP2177319B1 (de) 2012-07-04

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EP09012622A Active EP2177319B1 (de) 2008-10-08 2009-10-06 Vorrichtung zum Stoppen der Oszillation des Arms eines Handhabungsgeräts mit schwenkbarem Hebel

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EP (1) EP2177319B1 (de)
ES (1) ES2390399T3 (de)
IT (1) ITTO20080736A1 (de)
PL (1) PL2177319T3 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8459626B2 (en) * 2010-05-28 2013-06-11 Btm Corporation Pin clamp
US8746664B2 (en) * 2011-04-22 2014-06-10 Delaware Capital Formation, Inc. Spring actuated link clamp
CN118417071B (zh) * 2024-07-04 2024-09-10 国网安徽省电力有限公司五河县供电公司 一种变电站用接地合金防腐喷涂装置及使用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3403961C2 (de) * 1984-02-04 1987-01-29 Josef Gerhard 4030 Ratingen Tünkers Pneumatisch oder hydraulisch betätigbare Kniehebelspannvorrichtung zum Spannen von Karosserieteilen
DE29713944U1 (de) * 1997-08-05 1997-10-02 Tünkers Maschinenbau GmbH, 40880 Ratingen Druckmittelbetätigbare Kniehebelspannvorrichtung
DE29820284U1 (de) * 1998-11-13 1999-02-25 DE-STA-CO Metallerzeugnisse GmbH, 61449 Steinbach Spannvorrichtung
JP3672782B2 (ja) * 1999-12-08 2005-07-20 Ｓｍｃ株式会社 クランプ装置
DE20105949U1 (de) * 2001-04-04 2001-08-16 Tünkers Maschinenbau GmbH, 40880 Ratingen Durch Druckmittel, insbesondere pneumatisch, betätigte Kolben-Zylinder-Einheit
ITTO20010915A1 (it) 2001-09-25 2003-03-25 Vep Automation Srl Dispositivo di controllo dell'oscillazione del braccio di un'attrezzatura di movimentazione del tipo a leva oscillabile.
DE10211759A1 (de) * 2002-03-14 2003-10-09 Sta Co Mettallerzeugnisse Gmbh Kniehebelspannvorrichtung

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Publication number Publication date
ITTO20080736A1 (it) 2010-04-09
ES2390399T3 (es) 2012-11-12
PL2177319T3 (pl) 2012-11-30
EP2177319A1 (de) 2010-04-21

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