EP0370914A1 - Spannkopf mit Spielausgleich - Google Patents

Spannkopf mit Spielausgleich Download PDF

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Publication number
EP0370914A1
EP0370914A1 EP89403242A EP89403242A EP0370914A1 EP 0370914 A1 EP0370914 A1 EP 0370914A1 EP 89403242 A EP89403242 A EP 89403242A EP 89403242 A EP89403242 A EP 89403242A EP 0370914 A1 EP0370914 A1 EP 0370914A1
Authority
EP
European Patent Office
Prior art keywords
clamping
crankshaft
spring
ramp
clamping head
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.)
Withdrawn
Application number
EP89403242A
Other languages
English (en)
French (fr)
Inventor
Maurice Biron
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.)
Polymatic SA
Original Assignee
Polymatic SA
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 Polymatic SA filed Critical Polymatic SA
Publication of EP0370914A1 publication Critical patent/EP0370914A1/de
Withdrawn legal-status Critical Current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 relates to a clamping head for holding or clamping at least one part to be worked or treated, comprising a pivoting clamping member secured to a crankshaft, which is rotatably mounted in a casing and which can be moved between a position clamping and a loosening position by a drive member, which is linearly movable in the casing and which is connected to the crankshaft by a connecting rod assembly comprising at least one connecting rod, one end of which is articulated on the crankshaft and whose l hinge pin at the other end of the connecting rod carries at least one roller, which can roll on a ramp of a movable backrest provided in the casing, said backrest being biased by a spring in a direction orthogonal to the axis of rotation of the crankshaft and of the direction of movement of the drive member, to communicate a clamping force to the clamping member by means of the roller, the connecting rod and the crankshaft equin when it is in the clamping position.
  • the Applicant has already produced in 1984 a clamping head of the above-mentioned type, in which the movable backrest is constituted by a flexible metal blade, which extends roughly parallel to the direction of movement of the drive member and one end of which is rigidly fixed to the casing by a connection of the embedding type.
  • the roller rolls on the flexible blade from the embedded end to the free end of said blade.
  • the blade is deformed by bending around its point of embedding and it compresses the spring which thus stores energy.
  • the longitudinal axis of the connecting rod extends roughly orthogonally to the axis of rotation of the crankshaft and to the direction of movement of the drive member.
  • the clamping force is no longer provided by the drive member, but by the energy stored in the spring. Indeed, it repels the flexible blade, which in turn repels the connecting rod to provide the clamping force.
  • the spring is arranged so as to act on the flexible blade, near the free end of the latter, so that the force exerted by the spring is substantially collinear with the longitudinal axis of the connecting rod in the clamping position.
  • the present invention therefore aims to provide a clamping head in which one can obtain an effective clamping with a spring less powerful than in the known clamping head, and in which the clamping remains effective in a wide range of variation of the thickness of the parts to be clamped.
  • the clamping head of the invention is characterized in that the backrest can pivot around a fulcrum located near the end of the ramp where the roller is located when the crankshaft is in the position of tightening, and in that the spring acts on the backrest at a point which is further from the fulcrum than the point of contact between the roller and the ramp when the crankshaft is in the tightening position.
  • the clamping head shown in Figures 1 and 2 comprises, in known manner, a housing or body 1, composed of two parts 1a and 1b joined to each other by screws 2.
  • a crankshaft 3 is rotatably mounted in the casing 1 by means of bearings 4, ball or needle.
  • At least one of the two ends of the crankshaft 3, for example the two ends 3a and 3b protrude outside the casing 1 and have for example a square cross section to be able to be coupled to a clamping member and to move the one -this when the crankshaft 3 is rotated.
  • the clamping member may comprise, in known manner, a jaw holder 5, in the shape of a stirrup, composed of two arms 5a and 5b, which are fixed, at one of their ends, respectively to the ends 3a and 3b of the crankshaft 3 and, at their other end, at the ends of a spacer 5c.
  • a jaw (not shown) adapted to the shape of the part to be held or clamped, can be fixed in known manner to the jaw holder 5.
  • the clamping head further comprises, in a known manner, a slide 6, which is guided in the casing 1 so as to be able to move in a direction orthogonal to the axis of rotation of the crankshaft 3.
  • the latter is kinematically connected to the slide 6 by a connecting rod, which can comprise in a known manner two connecting rods 7 and 8.
  • the connecting rod 7 is articulated on the crank arm of the crankshaft 3 by an articulation axis 9
  • the connecting rod 8 is articulated on the slide 6 by an axis hinge 11 and the two connecting rods 7 and 8 are hinged together by a hinge pin 12.
  • the slide 6 can be moved in the casing 1 by means of a linear actuator 13, for example a pneumatic or hydraulic cylinder, the cylinder 14 of which is attached to the casing 1 and the piston rod 15 of which is coupled to the slide 6. More specifically, to move the slide 6 upwards (considering Figures 1 and 2), the piston rod 15 of the linear actuator 13 acts on a roller 16 carried by the axis 11 in its middle, while, to move the slide 6 downward, the piston rod 15 acts on a part 17 of the slide 6, which engages radially in a circular groove 18 of the piston rod 15, as is more particularly visible in FIGS. 6 to 8.
  • a linear actuator 13 for example a pneumatic or hydraulic cylinder
  • the clamping head further comprises, in a known manner, a backrest 19, in the form of an elongated piece having a ramp 20, which extends roughly in the direction of movement of the slide 6.
  • a backrest 19 in the form of an elongated piece having a ramp 20, which extends roughly in the direction of movement of the slide 6.
  • On the ramp 20 can roll at least one roller, for example two rollers 21, preferably with needle bearing, which are carried respectively by the ends of the axis 12, on either side of the connecting rod 8.
  • a spring or other elastic member 22 is designed to urge the backrest 19 in a direction which is orthogonal both to the direction of movement of the slide 6 and of the piston rod 15 and to the axis of rotation of the crankshaft 3.
  • the spring 22 acts in a direction such that , when the movable elements 3,6,7,8 and 15 of the clamping head occupy respective positions shown in Figures 2,6 and 8, corresponding to the closed position or clamping position of the clamping head (it will be noted that in this position the connecting rod 7 extends in a d irection parallel to the direction of action of the spring 22), the spring 22 transmits a clamping force to the jaw holder 5 via the backrest 19, the rollers 21, the connecting rod 7 and the crankshaft 3.
  • the backrest 19 can pivot around a fulcrum, for example a hinge pin 23, which is located near the end upper of the ramp 20 by considering Figures 1,2 and 8, that is to say near the end where the rollers 21 are located when the crankshaft 3 is in the clamping position ( Figures 2 and 8).
  • the spring 22 acts on the backrest 19 at a place thereof which is further from the hinge pin 23 than the point C of contact between the rollers 21 and the ramp 20, when the crankshaft 3 is in the clamping position. In this way, the force applied by the spring 22 to the backrest 19 and transmitted by the latter to the crankshaft 3, via the connecting rod 7, is multiplied by a leverage.
  • the clamping head of the invention makes it possible to obtain a greater final clamping force with a spring 22 of force equal to that of the spring of the known clamping head, or, at equal clamping forces, it allows to use a weaker spring 22 than in the known clamping head.
  • the spring 22 is constituted by a helical spring, since such a spring makes it possible to maintain an effective tightening even if the thickness of the part to be clamped varies to a relatively large extent compared to its nominal thickness (more or less 3mm in the example shown here).
  • the spring 22 may also be constituted by Belleville washers or even by a pad of elastomeric material.
  • the spring 22 will preferably be constituted by a mechanical spring (spring helical or Belleville washers) rather than by a pad made of an elastomeric material, because the pads of elastomeric material generally have elasticity characteristics which are less stable over time and which vary greatly with the frequency of the compressive stresses to which they are submitted.
  • the ramp 20 has a rectilinear profile over most of its length, and it has a hollow part 20a (FIGS. 1 and 8) near the axis of articulation 23 and a boss. 20b (better visible in FIGS. 7 and 8) at the free end of the ramp 20.
  • the hollow part 20a defines, in combination with the rollers 21 and the spring 22, a locking means capable of elastically holding the movable elements of the clamping head in the clamping position even in the event of a lack of compressed fluid in the jack 13.
  • the boss 20b defines, in combination with the rollers 21 and the spring 22, a locking means which resiliently maintains the movable elements of the clamping head in the open position or in the loosening position, even in the event of a lack of compressed fluid in the jack 13.
  • the clamping head which has been described above operates in the following manner. To begin with, it will be assumed that the movable elements of the clamping head are in the position shown in FIGS. 1 and 5, position in which the piston rod 15 of the jack 13 is completely retracted into the cylinder 14 under the action of 'a fluid under pressure admitted by an appropriate orifice of the cylinder 14. It will be noted that, even in the event of a lack of fluid under pressure, under the action of the spring 22 the boss 20b of the ramp 20 acts by its inclined part 20c (FIG. 8) on the rollers 21 to block them and, consequently, maintain the clamping head in the open position.
  • the backrest 19 Immediately after the rollers 21 have crossed the hard point formed by the boss 20b, the backrest 19 returns to its original position and as long as the jaw (not shown) carried by the jaw holder 5 does not encounter any obstacle (part to be clamped), the mobile assembly formed by elements 6, 7 and 8 moves upwards ( considering Figures 1 and 2) under the action of the piston rod 15, obliga nt thus the crankshaft 3 to rotate anti-clockwise and the jaw holder 5 to pivot correspondingly. During this time, the rollers 21 roll on the straight part of the ramp 20 without compressing the spring 22.
  • the resulting reaction force applies to the crankshaft 3 a reaction torque, directed clockwise, such as the rollers 21, while continuing to roll on the ramp 20, pushes the backrest 19 by pivoting it around its articulation axis 23 anticlockwise, thus compressing the spring 22.
  • the clamping head can be opened again by controlling the jack 13 so as to bring in its piston rod 15.
  • the slide 6 drives down the connecting rod 8 which rotates the connecting rod 7 about its articulation axis 9.
  • the backrest 19, pushing the rollers 21 under the action of the spring 22, rotates quickly the connecting rod 7 around its hinge axis 9.
  • two elastic buffers 24 (FIG. 4) are provided in said casing.
  • the spring 22 expands and the backrest 19 abuts against the shoulders 25 (FIG. 4) provided in the casing 1.
  • the boss 20b of the ramp 20 acts on the rollers 21 to maintain the clamping head in the open position.
EP89403242A 1988-11-25 1989-11-23 Spannkopf mit Spielausgleich Withdrawn EP0370914A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8815396A FR2639569B1 (fr) 1988-11-25 1988-11-25 Tete de bridage a rattrapage de jeux
FR8815396 1988-11-25

Publications (1)

Publication Number Publication Date
EP0370914A1 true EP0370914A1 (de) 1990-05-30

Family

ID=9372241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89403242A Withdrawn EP0370914A1 (de) 1988-11-25 1989-11-23 Spannkopf mit Spielausgleich

Country Status (4)

Country Link
EP (1) EP0370914A1 (de)
DE (1) DE370914T1 (de)
ES (1) ES2015837A4 (de)
FR (1) FR2639569B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596808A1 (de) * 1992-11-05 1994-05-11 Martin Breiter Spannkopf
DE9412722U1 (de) * 1994-08-06 1994-09-29 Sta Co Mettallerzeugnisse Gmbh Kniehebelspannvorrichtung
EP0849046A1 (de) * 1996-12-17 1998-06-24 DE-STA-CO Metallerzeugnisse GmbH Betätigungsgetriebe
EP0894573A2 (de) * 1997-07-29 1999-02-03 Benteler Ag Bauteilspanner
DE19751950C1 (de) * 1997-11-24 1999-03-04 Isi International Sa Kniehebelspannvorrichtung, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
ITTO20120106A1 (it) * 2012-02-08 2013-08-09 Vep Automation Srl Apparecchiatura di bloccaggio di pezzi, particolarmente di fogli di lamiera
WO2020071301A1 (en) * 2018-10-05 2020-04-09 Smc Corporation Clamping device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296494A1 (fr) * 1974-12-31 1976-07-30 Carel Fouche Languepin Dispositif de serrage pneumatique
FR2540021A1 (fr) * 1983-01-27 1984-08-03 Franche Comte Alsace Etudes Te Dispositif de serrage pneumatique a genouillere
FR2542656A3 (fr) * 1983-03-16 1984-09-21 Destaco Metallerzeug Gmbh Dispositif de serrage a genouillere comportant un verin a double effet
EP0145631A1 (de) * 1983-12-02 1985-06-19 ETUDES TECHNIQUES-FRANCHE COMTE-ALSACE ETFA Sàrl Pneumatische Spanneinrichtung mit Kniehebel
EP0216710A1 (de) * 1985-09-24 1987-04-01 Fabrice Goussu Mehrkopfspannvorrichtung mit einer einzelnen Fernbetätigung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296494A1 (fr) * 1974-12-31 1976-07-30 Carel Fouche Languepin Dispositif de serrage pneumatique
FR2540021A1 (fr) * 1983-01-27 1984-08-03 Franche Comte Alsace Etudes Te Dispositif de serrage pneumatique a genouillere
FR2542656A3 (fr) * 1983-03-16 1984-09-21 Destaco Metallerzeug Gmbh Dispositif de serrage a genouillere comportant un verin a double effet
EP0145631A1 (de) * 1983-12-02 1985-06-19 ETUDES TECHNIQUES-FRANCHE COMTE-ALSACE ETFA Sàrl Pneumatische Spanneinrichtung mit Kniehebel
EP0216710A1 (de) * 1985-09-24 1987-04-01 Fabrice Goussu Mehrkopfspannvorrichtung mit einer einzelnen Fernbetätigung

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596808A1 (de) * 1992-11-05 1994-05-11 Martin Breiter Spannkopf
DE9412722U1 (de) * 1994-08-06 1994-09-29 Sta Co Mettallerzeugnisse Gmbh Kniehebelspannvorrichtung
EP0849046A1 (de) * 1996-12-17 1998-06-24 DE-STA-CO Metallerzeugnisse GmbH Betätigungsgetriebe
EP0894573A3 (de) * 1997-07-29 1999-04-28 Benteler Ag Bauteilspanner
DE19732600A1 (de) * 1997-07-29 1999-02-25 Benteler Werke Ag Bauteilspanner
EP0894573A2 (de) * 1997-07-29 1999-02-03 Benteler Ag Bauteilspanner
DE19732600C2 (de) * 1997-07-29 2000-03-30 Benteler Werke Ag Bauteilspanner
US6206353B1 (en) 1997-07-29 2001-03-27 Benteler Werke Ag Clamping device for structural components
DE19751950C1 (de) * 1997-11-24 1999-03-04 Isi International Sa Kniehebelspannvorrichtung, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
EP0917932A1 (de) * 1997-11-24 1999-05-26 I.S.I. International S.A. Kniehebelspannvorrichtung, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
ITTO20120106A1 (it) * 2012-02-08 2013-08-09 Vep Automation Srl Apparecchiatura di bloccaggio di pezzi, particolarmente di fogli di lamiera
EP2626174A1 (de) * 2012-02-08 2013-08-14 VEP Automation S.r.l. Klemmvorrichtung zum Klemmen von Werkstücken, insbesondere Blättern
WO2020071301A1 (en) * 2018-10-05 2020-04-09 Smc Corporation Clamping device
US11413724B2 (en) * 2018-10-05 2022-08-16 Smc Corporation Clamping device

Also Published As

Publication number Publication date
FR2639569B1 (fr) 1991-01-18
DE370914T1 (de) 1990-11-08
FR2639569A1 (fr) 1990-06-01
ES2015837A4 (es) 1990-09-16

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