EP1524080B1 - Locking device of the articulated lever type for clamping workpieces - Google Patents

Locking device of the articulated lever type for clamping workpieces Download PDF

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Publication number
EP1524080B1
EP1524080B1 EP04024241A EP04024241A EP1524080B1 EP 1524080 B1 EP1524080 B1 EP 1524080B1 EP 04024241 A EP04024241 A EP 04024241A EP 04024241 A EP04024241 A EP 04024241A EP 1524080 B1 EP1524080 B1 EP 1524080B1
Authority
EP
European Patent Office
Prior art keywords
main shaft
case
movable member
rotation
auxiliary shaft
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
EP04024241A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1524080A1 (en
Inventor
Ener Varetto
Lio Piccolo
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
Original Assignee
VEP Automation Srl
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 VEP Automation Srl filed Critical VEP Automation Srl
Priority to PL04024241T priority Critical patent/PL1524080T3/pl
Publication of EP1524080A1 publication Critical patent/EP1524080A1/en
Application granted granted Critical
Publication of EP1524080B1 publication Critical patent/EP1524080B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention refers to devices of the articulated lever type provided with a clamping arm which can swing in order to allow to clamp workpieces with respect to the body of the device.
  • the invention refers to such a device in which the movement of the clamping arm can be controlled by driving means, typically driven by a fluid, or, as an alternative, following to the manual driving of a lever associated externally with the device.
  • the invention relates to a locking device of the articulated lever type for clamping workpieces, of the type defined in the preamble of annexed claim 1.
  • Such a device is known from DE-196 45 778 .
  • This document describes two different embodiments of a locking device, in both of which an auxiliary shaft is rotatably arranged coaxially inside the main shaft to which the clamping arm is keyed.
  • the auxiliary shaft is, besides rotatable, also axially movable with respect to the main shaft as a result of the axial thrust of elastic means operatively interposed between an end of the auxiliary shaft, where the manual driving lever is connected, and the main shaft.
  • the auxiliary shaft can only rotate with respect to the axis of the main shaft and therefore the slot formed in the main shaft is only directed transversely to the axis thereof, since it must allow only the transverse movement of the control pin following to the rotation of the auxiliary shaft with respect to the main shaft.
  • the elastic means operatively interposed between the auxiliary shaft to which the manual control lever is fixed and the main shaft act torsionally in order to bring back the auxiliary shaft in a preset angular position with respect to the main shaft, when the auxiliary shaft undergoes a rotation caused by the driving of the control lever.
  • the side hindrance of the two locking devices of this document is high, because the auxiliary shaft must project axially from both the ends of the main shaft in order to allow to arrange the elastic means on these projecting ends, so that the manual driving lever can be mounted indifferently at one of the two sides of the device, allowing therefore its installation according to two possible different configurations of use. In this manner, a portion of the auxiliary shaft always extends beyond the clamping lever at the side of the device opposite to that to which the lever is associated, which constitutes an obstacle able to limit the capability of the device to be installed.
  • the subject of the invention is a device having the features set forth in the appended claims.
  • a device according to the invention has a simpler inner structure and its members are more rugged than those of the similar known devices, on the same terms of external dimensions of the device, so that it allows higher loads to be applied by the manual control lever without any risk to damage its members.
  • the main shaft and the auxiliary shaft have substantially the same axial extension so that the device does not have any portion projecting sideways beyond the clamping arm at the side opposite to that to which the manual driving lever is associated, which improves the functional capacity and the operational flexibility of use and installation of the device.
  • a locking device of the articulated lever type which can be used for clamping workpieces, is indicated 1 as a whole.
  • a fork shaped clamping arm 12 is associated to the body 2 of the device 1, and is keyed to square sectioned ends 16a of a main shaft 16 having an axis A, by means of U-shaped locking members 14, 14a.
  • the axial extension of the shaft 16 is substantially equal to the width of the arm 12.
  • the shaft 16 has a control appendage 18 having the function of a crank and projecting radially from a central zone thereof, which is connected by means of an articulation pin with a pair of connecting rods 23.
  • the connecting rods 23 are in turn connected by means of another articulation pin to the end of a service rod 20, which is slidably mounted inside the body 2.
  • the articulated joint serving to connect the rod 20, which comprises the pair of connecting rods 23 and the control appendage 18, forms an articulated toggle joint of the device 1, indicated as a whole by the reference numeral 22, which will be considered in greater detail in the following.
  • the sliding movement of the rod 20 can be controlled by automatic driving means which, in the most common case, comprise a fluid-driven double acting cylinder 4 (figure 1), typically of the pneumatic type, which is fixed at the bottom of the body 2.
  • automatic driving means which, in the most common case, comprise a fluid-driven double acting cylinder 4 (figure 1), typically of the pneumatic type, which is fixed at the bottom of the body 2.
  • the rod 20 initially performs a raising movement indicated by arrow B of figure 2, until the connecting rods 23 of the toggle joint 22 reach a position perpendicular to the rod 20. In this position, which corresponds to the maximum effort of the toggle joint 22, a condition of unstable equilibrium is reached, which is called "dead point" condition because a further sliding of the rod 20 beyond this point does not cause a further rotation of the clamping arm 12.
  • the device 1 is also provided with a manual driving lever 30.
  • the lever 30 can be associated indifferently to each one of the two sides of the body 2, so as to make easy the installation of the device 1 in any configuration required for its use.
  • an auxiliary shaft 24 is arranged coaxially inside the main shaft 16, which auxiliary shaft is mounted so as to be able only to rotate with respect to the shaft 16.
  • a radial control pin 26 extending centrally from the auxiliary shaft 24 crosses a slit 28 of the main shaft 16, which slit is directed only transverse to the axis A.
  • the auxiliary shaft 24 has an axial extension which is substantially the same of the main shaft 16 and the side hindrance of the clamping arm 12, so that it does not project sideways from the side flanks of the arm 12.
  • the pin 26 has a free end 26a, for example having an hemispheric shape, which is adapted to engage a corresponding hollow seat 27, formed at a side of rod 20, when the latter is close to said "dead point” position, in order to allow to move axially the rod 20 in both the sliding directions thereof as a result of the driving of the lever 30.
  • the end 26a of the pin 26 engages the seat 27 at least in the range of movements of the rod 20 which are comprised between a first position slightly preceding the attainment of the "dead point" condition of the toggle joint 22, and a second position subsequent to such a "dead point” condition.
  • the control pin 26 has length such that it cannot interfere with the members of the toggle joint unit 22, and in particular with the connecting rods 23, but which allows only the engagement thereof in the seat 27 of the rod 20. In this manner, the small length of the pin 26 makes it relatively rugged and deteriorations of the toggle joint unit 22 can be avoided in the case of application of heavy loads to the lever 30, since the pin 26 does not interfere with the unit 22.
  • Respective hollow seats 24a having a hexagonal cross-section, are formed at the opposite ends of the auxiliary shaft 24.
  • Each of the seats 24a is adapted to receive a corresponding hexagonal pin 44 extending axially from a movable member 34, which has a generally cylindrical shape.
  • the pin 44 and the respective seat 24a in which it is received, constitute a prismatic fit allowing to fasten each other into rotation the member 34 and the auxiliary shaft 24.
  • a series of threaded radial holes 30a are formed on the external sidewall of the movable member 34 in order to allow to fix a corresponding threaded end of the manual driving lever 30.
  • the several holes 30a allow the arrangement of the lever 30 in the more favourable position for its driving, both in the case the lever 30 is associated to the right side or to the left side of the device 1, and in the case the device 1 is installed with its axis vertical or horizontal.
  • the member 34 is rotatably supported inside a substantially cylindrical and cage-shaped case 36 which has an integral connecting portion 14a quite similar to the U-shaped locking member 14, to allow the case 36 to be fixed to one of the branches of the arm 12, at one of the ends 16a of the shaft 16, in order to fasten it into rotation with the shaft 16.
  • the case 36 has a bottom wall 41 provided with a central hole 46 intended to be crossed by the hexagonal pin 44, in which a series of radial grooves 42 are formed, for example four, the shape of which is a little more extended than a semi-cylinder (see figure 7), in each of which a respective pin 40 is forcedly inserted.
  • a portion of the outside surface of each pin 40 project axially from the bottom wall 41, so that a rib is formed, which extends towards the member 34.
  • the member 34 has, on its face opposite to the wall 41, a series of radial grooves 38 intended to be engaged by the portions of the pins 40 projecting axially from the face 41.
  • the number of grooves 38 is twice as much as that of the pins 40, namely there are eight grooves 38 when four pins 40 are provided.
  • the pins 40 and the respective groove pairs 38 constitute reference formations intended to be mutually engaged following to the rotation of the member 34 with respect to the case 36, and therefore to the main shaft 16, as a result of the handling of the lever 30.
  • Each pair of grooves 38 is made in such a manner that one of the grooves of each pair of adjacent grooves 38 engages a respective pin 40 in a position of the lever 30 which corresponds to a first angular position of the pin 26 preceding the attainment of the "dead point" condition of the toggle joint 22, while the other groove of the same pair of grooves 38 engages the same pin 40 when the lever 30 is in a position which corresponds to a second angular position beyond the "dead point", in which the movement of the clamping arm 12 is made irreversible.
  • the ends 43 of each of these slots constitute shoulder surfaces for limiting the angular travel of the lever 30 with respect to the case 36, and therefore with respect to the main shaft 16.
  • the case 36 at the side opposite to the bottom wall 41, is closed by means of a generally disc-shaped external cover 48 which has a cylindrical axial pin 50 on which a plurality of Belleville springs are inserted coaxially in order to constitute a spring pack 32.
  • the spring pack 32 bears at one side on the inner face of the cover 48 and, at the opposite side, on the edge of a collar 52a formed close to the bottom of an axial hole 52 of the member 34, within which the pin 50 is axially movable.
  • the spring pack 32 which is operatively interposed between the case 36 fixed to the main shaft 16 and the movable member 34 connected into rotation with the auxiliary shaft 24, urges the movable member 34 towards the auxiliary shaft 24, in the direction of the axis of rotation A.
  • Corresponding threads 54 and 56 are formed on the peripheral edge of the cover 48 and inside the case 36, at the side opposite to the bottom wall 41, which are intended to engage each other in order to allow to connect the cover 48 to the case 36, so as to close the movable member 34 within the case 36.
  • the cover 48 is provided with seats 49 on its outside face, in order to control its rotation by means of a tool (not shown) during the closing step of the case 36 and in order to change the distance between the cover 48 and the member 34 with the aim of adjusting the preloading of the spring pack 32.
  • the spring pack 32 undergoes a compressive stress, while in the condition in which the pins 40 engage a respective groove 38, the spring pack 32 expands so that it returns in a normal working condition in which it exerts an axial thrust determined by the preloading of the pack 32 as a result of the angular position of the cover 48 with respect to the case 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Pivots And Pivotal Connections (AREA)
EP04024241A 2003-10-16 2004-10-12 Locking device of the articulated lever type for clamping workpieces Expired - Lifetime EP1524080B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04024241T PL1524080T3 (pl) 2003-10-16 2004-10-12 Urządzenie mocujące typu z dźwignią przegubową do mocowania przedmiotów obrabianych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000813A ITTO20030813A1 (it) 2003-10-16 2003-10-16 Dispositivo di chiusura a leva articolata per il bloccaggio di pezzi.
ITTO20030813 2003-10-16

Publications (2)

Publication Number Publication Date
EP1524080A1 EP1524080A1 (en) 2005-04-20
EP1524080B1 true EP1524080B1 (en) 2007-11-21

Family

ID=34362451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04024241A Expired - Lifetime EP1524080B1 (en) 2003-10-16 2004-10-12 Locking device of the articulated lever type for clamping workpieces

Country Status (5)

Country Link
EP (1) EP1524080B1 (pl)
DE (1) DE602004010217T2 (pl)
ES (1) ES2297320T3 (pl)
IT (1) ITTO20030813A1 (pl)
PL (1) PL1524080T3 (pl)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005049647B3 (de) * 2005-10-18 2007-06-28 Festo Ag & Co Spanneinrichtung zum Spannen von Werkstücken
DE202006000904U1 (de) * 2006-01-19 2006-05-11 Karin Schmid E. K. Schwenkspanner für Automatisierungszwecke
DE102007007271A1 (de) * 2007-02-14 2008-08-21 Otto Ganter Gmbh & Co. Kg Normteilefabrik Duo-Schnellspanner mit Multi-Druckstempel
JP5418997B2 (ja) 2008-01-22 2014-02-19 Ｓｍｃ株式会社 クランプ装置
DE102009048510A1 (de) 2009-10-09 2011-04-14 De-Sta-Co Europe Gmbh Spannvorrichtung
DE102011018988A1 (de) 2011-04-28 2012-10-31 De-Sta-Co Europe Gmbh Betätigungsvorrichtung
DE102011018987A1 (de) * 2011-04-28 2012-10-31 De-Sta-Co Europe Gmbh Spannvorrichtung
DE202013005869U1 (de) 2013-06-29 2013-08-09 Tünkers Maschinenbau Gmbh Kniehebelspannvorrichtung
FR3023201B1 (fr) * 2014-07-04 2016-07-15 Peugeot Citroen Automobiles Sa Dispositif de serrage de pieces destinees a etre assemblees, notamment des pieces de carrosserie de vehicule dans une operation de ferrage.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29516531U1 (de) * 1995-10-19 1995-12-14 Tünkers Maschinenbau GmbH, 40880 Ratingen Kniehebelspannvorrichtung
DE19645778C2 (de) * 1996-11-07 1999-07-08 Sta Co Mettallerzeugnisse Gmbh Kniehebel-Spannvorrichtung

Also Published As

Publication number Publication date
PL1524080T3 (pl) 2008-04-30
ITTO20030813A1 (it) 2005-04-17
ES2297320T3 (es) 2008-05-01
EP1524080A1 (en) 2005-04-20
DE602004010217D1 (de) 2008-01-03
DE602004010217T2 (de) 2008-10-02

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