EP3061568A1 - Dispositif de serrage pour des pièces de différentes épaisseurs - Google Patents

Dispositif de serrage pour des pièces de différentes épaisseurs Download PDF

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Publication number
EP3061568A1
EP3061568A1 EP15156685.8A EP15156685A EP3061568A1 EP 3061568 A1 EP3061568 A1 EP 3061568A1 EP 15156685 A EP15156685 A EP 15156685A EP 3061568 A1 EP3061568 A1 EP 3061568A1
Authority
EP
European Patent Office
Prior art keywords
clamping
clamping device
spring
housing
receiving
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
Application number
EP15156685.8A
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German (de)
English (en)
Other versions
EP3061568B1 (fr
Inventor
Stefano Raimondi
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.)
Univer SpA
Original Assignee
Univer SpA
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Publication date
Application filed by Univer SpA filed Critical Univer SpA
Priority to EP15156685.8A priority Critical patent/EP3061568B1/fr
Publication of EP3061568A1 publication Critical patent/EP3061568A1/fr
Application granted granted Critical
Publication of EP3061568B1 publication Critical patent/EP3061568B1/fr
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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
    • B25B5/166—Slideways; Guiding and/or blocking means for jaws thereon

Definitions

  • the invention relates to a clamping device for clamping workpieces at different clamping force of the clamping device, comprising a housing, a pivotable about a housing-fixed axis two-armed lever, wherein the lever arm of the lever is pivotally connected to a displaceably mounted in the housing clamping element and the other lever arm of the lever is pivotally connected to a rod in the region of one end of the rod and the rod is pivotally connected in the region of the other end with an actuating part, wherein the actuating part by means of an actuator of the clamping device is movable, wherein the rod and the associated lever arm form a toggle mechanism, which is located in a cocked workpiece in a position in which, without the action of the actuator, an opening of the clamping device is prevented, wherein a spring device is mounted in the housing forms a resilient stop for the actuator during clamping of the workpiece according to its strength.
  • Such a tensioning device is, for example, a substructure tensioner.
  • the clamping element protrudes through an opening of a wall of the housing to tension sheets.
  • the clamping serving end of the clamping element is in particular hook-shaped.
  • the clamping device In practice, applications are recorded in which by means of the clamping device different thickness workpieces are to be clamped, which are in particular sheets of different thickness.
  • the clamping device must be able to clamp both a sheet with a thickness of 1 mm, as well as sheets with a thickness of 2 mm, 3 mm or larger sheet thicknesses. It is particularly advantageous if the clamping of workpieces of different thickness can be done without external intervention in the clamping device, thus adjusting the clamping device by an operator.
  • a tensioning device that meets these requirements and that has the features of the type mentioned, is from the EP 2 626 174 A1 known.
  • the spring device which forms the resilient stop for the adjusting part during clamping of the workpiece according to its strength, designed as a gas spring.
  • a piston of the gas spring is displaceable stored in a stationary gas spring housing.
  • the piston contacts the end face of a roller which is rotatably mounted in an axis, said axis being mounted in a slot of the adjusting part.
  • the roller assume a variable position, and also the piston against which the roller, so in this manner according to the respective strength of the workpiece to be clamped a displacement of the stop for the Control can be accomplished.
  • a spring element is arranged directly in the power flow of an actuator to a two-armed lever which receives a clamping element, which is pivotally mounted in the region of both ends. This spring element can expand differently depending on the strength of the workpiece to be clamped and thus introduced into the spring element.
  • clamping devices for clamping workpieces are in the DE 2003 13 040 U1 and EP 1 702 719 A1 described. However, these are not provided for clamping workpieces at different clamping force of the clamping device. It can be clamped with these fixtures at least no workpieces whose thickness is a multiple of an initial strength.
  • Object of the present invention is to provide a comparison with the clamping device of the type mentioned modified clamping device, which is structurally particularly simple, but still allows the clamping of workpieces of different thickness.
  • the spring device has a split spring receptacle with mechanical springs acting on relatively movable receiving parts of the spring receptacle.
  • means for connecting the two receiving parts are provided under the action of the springs.
  • the spring device is constructed very compact and provided with a small number of exclusively mechanically acting components.
  • the spring device is essentially formed by the two receiving parts and the springs, wherein the means for connecting the two receiving parts ensure that they can be forced apart under the action of mechanical springs to a certain extent. If the tool is not tensioned and the actuator is in a position corresponding to this position of the clamping element, the actuating part is moved out of the effective range of the spring device. In this case, the means for connecting the two receiving parts hold back the other receiving part.
  • the actuator When clamping the workpiece, thus when the actuator moves the actuator again, the actuator is moved back into the range of the spring means and it is based on the actuating part upon reaching and exceeding the toggle position on resilient stop, thus on the resilient spring means.
  • the spring device is compressed to different degrees, depending on the strength of the workpiece to be clamped. With a relatively thin workpiece, the mechanical springs are only slightly compressed, while with a workpiece of greater strength, the mechanical springs are compressed more strongly.
  • the deformation of the mechanical springs is limited or controlled by the dimensions of the respective spring element to ensure irreversibility of the movement, as well as the clamping force of the clamping element, in particular of the hook.
  • the stiffer the mechanical springs the greater the clamping force of the clamping element or the hook.
  • the spring device is arranged within the housing of the tensioning device.
  • the arrangement within the housing can be realized in a particularly simple manner, in particular when relatively small clamping forces are to be controlled by means of the clamping device, for example clamping forces of workpieces which lie in the range from 1 mm to 3 mm.
  • clamping forces of workpieces which lie in the range from 1 mm to 3 mm.
  • the spring device will usually have larger dimensions, so that in this case it is considered advantageous if the spring means is arranged outside the housing of the clamping device.
  • the mechanical springs are designed as disc springs, in particular form a plate spring package.
  • the mechanical springs are arranged compact, thus need only a small space when transmitting quite large spring forces.
  • these springs can be placed particularly favorable within the receiving parts of the spring receiver.
  • the means for connecting the two receiving parts have a screw, wherein the screw passes through a passage in one of the receiving parts and is screwed into a threaded bore of the other receiving part is particularly advantageous. Consequently, the two receiving parts are held by a simple screw connection, which ensures that the two receiving parts can move away from each other by the action of mechanical springs only by a defined amount, on the other hand, the receiving parts can be moved towards each other, when compressing the mechanical springs and relative movement the screw to the receiving part, which has the passage. In this way, the spring device be handled as a unit, thus pre-assembled as a unit and positioned in the housing.
  • the spring device is held in the housing. This can be done by a simple press connection, to the effect that the stationary receiving part of the spring receptacle is pressed into the housing, or by attaching the spring means in the housing by means of fastening means provided for this purpose.
  • the adjusting member is out of action by the springs, wherein the receiving parts of the spring receiving means are held at a distance from each other by means for connecting the two receiving parts, based on the delivery of the two receiving parts to each other.
  • the actuator has moved the actuating part out of the way of the spring device, wherein the means for connecting the two receiving parts ensure that the movable receiving part only moves away from the stationary receiving part by a defined amount can move. If the actuator is actuated again to clamp the workpiece, the actuating part moves into the region of the spring device and interacts with the movable receiving part of the spring device during clamping of the workpiece.
  • the two receiving parts of the spring means are arranged at a relatively large distance from each other, based on the feed direction. Furthermore, it is provided that in the clamping position of the clamping device, with a tensioned workpiece of relatively large thickness, the two receiving parts of the spring device are delivered to each other maximum. This maximum delivery of the two receiving parts may well lead to contact the two receiving parts.
  • the spring device is designed and also very easy to assemble when the screw passes through a passage in the plate spring package.
  • the individual disc springs are positioned and, moreover, essentially symmetrical forces are introduced into the two receiving parts of the spring device via the screw in cooperation with the disc spring package if the movable receiving part is not acted upon by the setting part.
  • the disc spring assembly is guided axially outside by one of the receiving parts of the spring receiving and inside by the other receiving part of the spring receiving.
  • the actuating part is provided with a rotatable about an axis roller.
  • the axis of this role is arranged parallel to the axis of the joint of the control part and rod.
  • the role contacted during tensioning the spring device. This contacting is preferably recorded already in bringing about the final clamping position and, of course, when the workpiece is stretched.
  • the rotatable roller is in particular defined in the control part mounted, thus the axis is not displaced relative to a slot in the control part.
  • the roller preferably contacts a rolling surface of the associated receiving part of the spring receiver. At constant bearing axis of the roller in the control part is thus ensured that the role can roll due to the curved roller surface optimally on the rolling surface of the receiving part in the process of the actuating part by means of the actuator and then acts with increasing process more on the role of the associated receiving part and thus the spring means ,
  • the rolling surface is arranged parallel to the axis of the roller and substantially parallel to the direction of travel of the actuator.
  • the tensioning device has a housing 2 and a two-arm lever 4, which is pivotable about a housing-fixed axle 3.
  • the one lever arm 5 of the lever 4 is pivotally connected to a displaceably mounted in the housing 2 clamping element 6.
  • the pivoting takes place about the axis 7, in the region of the lever arm 5 and the clamping element 6 are interconnected.
  • the tensioning element 6 has a guide section 8 arranged within the housing 2 with guide grooves 9, which pass through the bearing bolts 10. Adjacent to the guide section 8 is a clamping hook 11 of the clamping element 6, which is led out through an end opening in the housing 3 and clamping a workpiece 12, which is a sheet, between the clamping hook 3 and the housing 2, specifically one with the housing 2 connected support 13 is used.
  • the other lever arm 14 of the lever 4 is pivotally connected to a rod 15 in the region of one end of the rod 15.
  • an axis 16 passes through the lever arm 14 and the rod 15.
  • the rod 15 is pivotally connected to an actuating part 17.
  • An axis 18 connects the rod 15 pivotally connected to the actuating member 17.
  • the actuator 17 is designed as an angled component, wherein a substantially horizontally disposed legs of the actuator 17 end receives the axis 18 and a substantially vertically disposed, downwardly directed portion of the actuator 17 in the region of its lower end an axis 19 receives, in which a in Essentially vertically reciprocable piston rod 20 of an actuator 21 is pivotally mounted.
  • the actuator 21 is in particular an electrically or pneumatically operated actuator, which is housed in a housing 22 which is connected to the housing 2.
  • the axes 16 and 19 are arranged parallel to each other. Parallel to these, a roller 23 is mounted in the corner region of the actuating part 17. The axis of the roller 23 is designated by the reference numeral 24.
  • the adjusting member 17 is therefore movable by means of the piston rod 20 of the actuator 21.
  • the rod 15 and associated with this lever arm 14 form a toggle mechanism 25, which is located in a cocked workpiece 12 in a position in which, without the action of the actuator 21, an opening of the clamping device 1 is prevented.
  • the housing 2 has two housing parts 26, 27.
  • a spring device 28 is mounted, which forms a resilient stop for the adjusting member 17 and thus for the roller 23 during clamping of the workpiece 12 according to its strength.
  • This spring device 28 has a split spring receptacle 29 with on relatively movable receiving parts 30, 31 of the spring retainer 29 acting mechanical springs 32.
  • These mechanical springs 32 are formed as disc springs, which form a plate spring packet 33.
  • one receiving part 31 is supported on the housing 2 and the other receiving part 30 acts on the roller 23.
  • the roller 23 during clamping contacts a rolling surface 35 of the receiving part 30.
  • This rolling surface 35 is arranged parallel to the axis 24 of the roller 23 and substantially parallel to the direction of movement 36 of the piston rod 20 of the actuator 21.
  • Held is that Spring device 28 by the receiving part 31 is pressed into a receptacle 37 of the housing 2.
  • the spring device 28 is designed such that the screw 34 passes through a passage 38 in the receiving part 31 and the screw 34 is screwed into a threaded bore 39 of the receiving part 30.
  • the screw 34 passes through the ring-shaped, in each case identical inner and outer diameter having springs 32 of the plate spring package 33.
  • the plate spring packet 33 is guided externally through the receiving part 31, possibly also through the receiving part 30, furthermore, the plate spring packet inside by the receiving part 30, there the approach of the threaded hole 39 has, led.
  • a relatively wide annular gap 40 is formed between the two receiving parts 30 and 31 in the area of their end faces, whereby the thickness of the annular gap 40 reduces with increasing compression of the plate spring packet 33 until the annular gap 40 is closed and thus the receiving part 30 the receiving part 31 contacted the front side.
  • the Fig. 9 shows the clamping device in its non-clamping position, thus at maximum extended clamping element 6, thus maximally spaced from the housing 2 arranged clamping hook 11.
  • the clamping element 6 is positioned such that the housing-fixed bearing pin 10, the guide grooves 9 of the clamping element 6 in the region of the lower ends to contact.
  • the lever 4 in this case assumes a pivoting position, which results in that the rod 15 connected thereto is arranged almost stretched with respect to the lever arm 14 of the lever 4.
  • the adjusting member 17 is in a maximum remote position of the clamping element 6, which corresponds to the retracted position of the piston rod 20 of the actuator 21.
  • By retracting the piston rod 20 of the actuator 21 is thus this functional position according to Fig. 9 reached.
  • the roller 23 is straight still in the region of the vertex of the rolling surface 35 of the receiving part 30 in the region of the lower end.
  • the 3 and 4 illustrate that in the clamping of a workpiece or sheet 12, for example, has a thickness of 1 mm, the clamping element 6 assumes such a position that their guide grooves 9 contact the housing-fixed bearing pin 10 in its upper end.
  • the clamping element 6 assumes such a position that their guide grooves 9 contact the housing-fixed bearing pin 10 in its upper end.
  • FIGS. 7 and 8 it can be seen to stretch an even stronger workpiece, in this case three sheets 12 with a thickness of 1 mm, therefore to stretch a total thickness of 3 mm, this will cause the toggle mechanism 25 is still in its over-center position, however the adjusting member 17 is further displaced against the resilient stop, with the consequence that the cup spring package 33 is further compressed.
  • the representation of Fig. 8 It can be seen that the annular gap 40 between the two receiving parts 30, 31 is closed and the screw 34 is further displaced axially with respect to the receiving part 31.
  • the clamping device To release the clamping hook 11, the clamping device, starting from the respective clamping position according to Fig. 4 . Fig. 6 or Fig. 8 , in the non-tension position according to Fig. 9 transferred.
  • the piston rod 20 is retracted by actuation of the actuator 21 and it rolls off the roller 23 on the rolling surface 35, wherein, due to the transfer of the toggle mechanism 25 from the over-center position, now the spring means 28 can relax.
EP15156685.8A 2015-02-26 2015-02-26 Dispositif de serrage pour des pièces de différentes épaisseurs Active EP3061568B1 (fr)

Priority Applications (1)

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EP15156685.8A EP3061568B1 (fr) 2015-02-26 2015-02-26 Dispositif de serrage pour des pièces de différentes épaisseurs

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Application Number Priority Date Filing Date Title
EP15156685.8A EP3061568B1 (fr) 2015-02-26 2015-02-26 Dispositif de serrage pour des pièces de différentes épaisseurs

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EP3061568A1 true EP3061568A1 (fr) 2016-08-31
EP3061568B1 EP3061568B1 (fr) 2017-04-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3375569A1 (fr) 2017-03-13 2018-09-19 UNIVER S.p.A. Dispositif de positionnement, de pivotement ou de serrage de pièces usinées
EP3677382A1 (fr) 2019-01-02 2020-07-08 UNIVER S.p.A. Dispositif de maintien ou de serrage des pièces ainsi que mandrin pour un dispositif de maintien ou de serrage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350591A1 (fr) * 2002-04-02 2003-10-08 Luciano Migliori Dispositif de serrage pour soudage au laser
DE20313040U1 (de) 2003-08-23 2003-10-30 Tuenkers Maschinenbau Gmbh Als Unterflurspanner ausgebildete Kniehebelspannvorrichtung, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
EP1702719A1 (fr) 2005-03-17 2006-09-20 UNIVER S.p.A. Dispositif de blocage ayant un élément de serrage en forme de crochet
EP2177320A1 (fr) * 2008-10-15 2010-04-21 UNIVER S.p.A. Dispositif de commande à genouillère de type irréversible
US20120074633A1 (en) * 2010-09-23 2012-03-29 Delaware Capital Formation, Inc. Centering and Clamping Device
EP2626174A1 (fr) 2012-02-08 2013-08-14 VEP Automation S.r.l. Dispositif de serrage permettant de serrer des pièces de travail, notamment des feuilles
DE102013009925A1 (de) 2013-06-13 2014-12-18 Centrotherm Photovoltaics Ag Messobjekt, Verfahren zur Herstellung desselben und Vorrichtung zum thermischen Behandeln von Substraten

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350591A1 (fr) * 2002-04-02 2003-10-08 Luciano Migliori Dispositif de serrage pour soudage au laser
DE20313040U1 (de) 2003-08-23 2003-10-30 Tuenkers Maschinenbau Gmbh Als Unterflurspanner ausgebildete Kniehebelspannvorrichtung, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
EP1702719A1 (fr) 2005-03-17 2006-09-20 UNIVER S.p.A. Dispositif de blocage ayant un élément de serrage en forme de crochet
EP2177320A1 (fr) * 2008-10-15 2010-04-21 UNIVER S.p.A. Dispositif de commande à genouillère de type irréversible
US20120074633A1 (en) * 2010-09-23 2012-03-29 Delaware Capital Formation, Inc. Centering and Clamping Device
EP2626174A1 (fr) 2012-02-08 2013-08-14 VEP Automation S.r.l. Dispositif de serrage permettant de serrer des pièces de travail, notamment des feuilles
DE102013009925A1 (de) 2013-06-13 2014-12-18 Centrotherm Photovoltaics Ag Messobjekt, Verfahren zur Herstellung desselben und Vorrichtung zum thermischen Behandeln von Substraten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3375569A1 (fr) 2017-03-13 2018-09-19 UNIVER S.p.A. Dispositif de positionnement, de pivotement ou de serrage de pièces usinées
EP3677382A1 (fr) 2019-01-02 2020-07-08 UNIVER S.p.A. Dispositif de maintien ou de serrage des pièces ainsi que mandrin pour un dispositif de maintien ou de serrage

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