EP0761390A1 - Dispositif de serrage - Google Patents

Dispositif de serrage Download PDF

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Publication number
EP0761390A1
EP0761390A1 EP96113296A EP96113296A EP0761390A1 EP 0761390 A1 EP0761390 A1 EP 0761390A1 EP 96113296 A EP96113296 A EP 96113296A EP 96113296 A EP96113296 A EP 96113296A EP 0761390 A1 EP0761390 A1 EP 0761390A1
Authority
EP
European Patent Office
Prior art keywords
clamping
lever
element according
ball
clamping element
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
EP96113296A
Other languages
German (de)
English (en)
Other versions
EP0761390B1 (fr
Inventor
David Fischer
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0761390A1 publication Critical patent/EP0761390A1/fr
Application granted granted Critical
Publication of EP0761390B1 publication Critical patent/EP0761390B1/fr
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
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction
    • 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
    • B25B5/061—Arrangements for positively actuating jaws 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
    • B25B5/06—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 invention relates to a clamping element for clamping workpieces on devices, machine tables and pallets by means of a piston which is guided in a housing and which moves a connecting rod which is connected to a rotatably mounted clamping lever.
  • Clamping elements are used to fix workpieces on tables and the like.
  • the workpiece to be clamped is aligned on these tables for the respective work step and its position must not be changed afterwards.
  • the clamping claws or clamping levers must therefore grip the workpiece in such a way that it remains in its position.
  • Clamping elements, the clamping lever of which first perform a sliding movement over the part to be clamped, which then changes into a circular clamping movement have the disadvantage that the forces exerted on the workpiece do not strike and act perpendicularly, but at angles to it, since the rotation and Support point is not at the same height as the clamping point. This often moves the workpieces out of their positioned position.
  • a tensioning element is known (PS-FR 7138412), in which a vertically guided differential piston is pressurized upwards and downwards downward movement.
  • a connecting rod is inserted in a ball guide on the piston head.
  • This connecting rod acts on a crank rod to which it is connected by means of an articulated eye.
  • the crank rod in turn, is firmly connected to the actual tensioning lever via a common shaft.
  • the forces generated by the movement of the piston are transmitted via the connecting rod to the crank rod, which in turn transmits the forces to a shaft at the end of which the tensioning lever is located. This creates torrision forces and bending forces in the shaft.
  • the tensioning lever describes the same long way at its tensioning point as the end of the crank rod with the joint eye of the connecting rod.
  • the invention has for its object to provide a flat clamping element of the smallest dimensions, the force is applied approximately horizontally to the workpiece to be clamped, and the clamping forces act vertically on the workpiece to be clamped, and which has a large clamping stroke and is also sealed against contamination of all kinds .
  • the advantage of the invention lies in the small, flat design, which allows a large field of application. This means that the flat clamping element can be used on all types of devices and pallets. Another advantage is that the flat clamping element has a large clamping stroke and thus workpieces of different sizes can be assigned can. Further advantages are the seal, which makes the flat clamping element insensitive to external influences such as dust, machining chips and liquids.
  • the housing 1 is formed in the form of an open fork head 2.
  • a piston bore 3 is made in the housing 1, in which a piston 4 slides.
  • the piston rod 5 is guided in a threaded bushing 18, which also serves as a seal.
  • a spherical cap 8 is let in.
  • a connecting rod 7 is guided, which is used for the transmission of the power transmission.
  • the connecting rod 7 has an approximately equally large ball head 9a and 9b at both ends.
  • the ball head 9a is mounted in the spherical cap 8 and can thus move therein by the predetermined degree of freedom.
  • the ball head 9b is also mounted in a spherical cap 10, in which it can move with the predetermined degree of freedom.
  • the calotte 10 in turn is embedded in the tensioning lever 11. This tensioning lever 11 forms a pocket 12 in the area of the spherical cap 10. This gives the connecting rod 7 freedom in its movement.
  • a small bore 14 is made, in which a driving pin 15 is guided.
  • This driving pin 15 supports the return process of the clamping lever 11 by a guide inside the pocket 12 and thus keeps the ball head 9b in contact with the calotte 10.
  • the two are in the piston bore 3 above and below the piston 4 Pressure spaces 16 and 17 are formed, of which pressure space 16 serve for the tensioning process and pressure space 17 for the relaxation process.
  • the space between the clamping lever 11 and the threaded bushing 18 is sealed. Sealing is done using spring plates.
  • the inner spring plate 19 has a contour that is adapted to the outer contour of the stroke on the circumference of the tensioning lever 11 with the entire length, so that it is slidably guided on the spring plate 19.
  • the contour of the lower spring plate 20 is adapted to the lower contours of the tensioning lever 11, so that here too a tight seal is achieved with a sliding movement of the tensioning lever 11.
  • Another spring plate 21 establishes a connection between the housing 1 and the spring plate 19 resting on the tensioning lever 11.
  • the piston 4 is guided in a threaded bushing 18 which is equipped with appropriate seals. This threaded bushing 18 is screwed into the threaded bore 6 of the housing 1 and can therefore be easily replaced if necessary.
  • the clamping lever 11 is formed on its clamping surface so that it sits flat on the workpiece 25.
  • a spherical cap 22 is inserted into the clamping head, which receives a flattened ball 23.
  • the clamping lever 11 is provided with a constriction 24 and a bevel 29 in the region of its clamping head.
  • This constriction 24 and also the bevel 29 serve to improve the shape in order to ensure that the flattened ball 23 is placed securely on the workpiece 25. This is particularly advantageous if there are large differences in height of the workpieces to be clamped.
  • the constriction 24 and the bevel 29 weaken the flattened spherical cap 22 comprising the flattened ball 23 in its holding surface.
  • lateral enclosures 27 are provided on the clamping head, which expand the calotte guide without interfering with the clamping stroke by interfering edges.
  • the housing 1 is fixed by means of fastening screws on the respective processing plate. If the pressure chamber 16 is acted upon, the piston 4 slides in the direction of the workpiece with the piston rod 5 guided in the threaded bushing 18. So that the introduced force is transmitted to the connecting rod 7, which in turn directly, i.e. without crank rod, acts on the tensioning lever 11.
  • This clamping lever 11 performs a rotational movement about the pivot point, the cylindrical pin 13, towards the workpiece 25 to be clamped.
  • the clamping lever 11 will always hit the workpiece 25 with the flattened side of the ball 23.
  • This ball 23 thus largely compensates for the clamping force running on a circular path and ensures a uniform placement on the workpiece and a uniform introduction of force into the workpiece.
  • the bevel 29 and the constriction 24 ensure during the clamping process that the clamping lever 11 is seated only with the surface of the flattened ball 23, regardless of the heights of the workpieces to be clamped.
  • the clamping lever 11 With its outer contour, the clamping lever 11 forms approximately a quarter circle. As a result, the center of the ball head 9b, the cylinder pin center 13 and the surface of the clamping ball 23 can be positioned approximately at an angle of 90 ° to one another. This results in a lying arrangement of the connecting rod 7, piston rod 5 with piston 4.
  • the cross-section of the tensioning lever 11 is different. It is thickest in the area of the gabein, while in the area of its action it is only provided with a cross-section that is required to insert the calotte and thus to accommodate the flattened ball.
  • the pressure chamber 17 is pressurized, whereby the piston 4 slides in the piston bore 3 in the direction away from the workpiece and thereby presses out the hydraulic fluid present in the pressure chamber 16.
  • the piston rod 5 pulls the connecting rod 7 back, which in turn retrieves the tensioning lever 11 via the driving pin 15.
  • the point of engagement of the connecting rod 7 on the tensioning lever 11 is in the range above the fulcrum of the tensioning lever 11 in the cylinder pin 13.
  • the short piston stroke which causes a large opening of the tensioning lever, results because the pressure point of the small connecting rod ball and the associated calotte of the tensioning lever are extremely close to the tensioning lever pivot point.
  • An optimal arrangement of the center of the ball of the connecting rod is achieved through the pocket in the tensioning lever, so that in the tensioning position the axis runs straight through the connecting rod and through the piston rod.
  • the distance between the center of the ball of the ball 9b and the pivot point in the cylinder 13 for the clamping lever 11 is approximately half the distance between the center, the flattened ball 23 arranged in the clamping head and the center of the clamping lever in the cylinder 13.
  • the piston guide is now only due to the stroke of the clamping lever, which supports the short design.
  • This design allows a relatively large clamping stroke, since the introduction of force into a workpiece already begins when the clamping lever is just beginning its rotary movement (cf. FIG. 5). This allows different workpieces of different thicknesses to be clamped.
  • the stroke difference between min and max is more than 20mm, with a total height of the clamping element of approx. 50mm.
  • the fork head forms the two forks 2a and 2b. Bores 28 are made in these forks, in which the cylindrical pin or pins 13 are guided. One or two cylindrical pins are expediently arranged in the clamping element. These pins can be screwed into the forks from the outside or can also be pressed in.
  • the clamping element is rotatably mounted about this axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Road Signs Or Road Markings (AREA)
EP96113296A 1995-08-30 1996-08-20 Dispositif de serrage Expired - Lifetime EP0761390B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19531890 1995-08-30
DE19531890A DE19531890A1 (de) 1995-08-30 1995-08-30 Flachspannelement

Publications (2)

Publication Number Publication Date
EP0761390A1 true EP0761390A1 (fr) 1997-03-12
EP0761390B1 EP0761390B1 (fr) 2001-10-31

Family

ID=7770755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113296A Expired - Lifetime EP0761390B1 (fr) 1995-08-30 1996-08-20 Dispositif de serrage

Country Status (4)

Country Link
EP (1) EP0761390B1 (fr)
AT (1) ATE207788T1 (fr)
DE (2) DE19531890A1 (fr)
ES (1) ES2166420T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100017555A1 (it) * 2021-07-02 2023-01-02 Hydroblock S R L Apparecchio per il bloccaggio di pezzi su macchine utensili

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043303B4 (de) 2004-09-08 2018-07-26 Andreas Maier Gmbh & Co. Kg Spannsystem für Bearbeitungszentren
DE102007050946B4 (de) 2007-10-23 2009-08-13 Frank Entzmann Spannvorrichtung
DE102008004286A1 (de) * 2008-01-04 2009-07-09 Vel Vega-Design E Tecnologia Ind. Unip. Lda., Funchal Spannelement
DE102016200149B4 (de) 2016-01-08 2020-09-03 Ladenburger Fertigungstechnik Gmbh Vorrichtung zum Spannen von Werkstücken
DE102017104868A1 (de) 2017-03-08 2018-09-13 Karin Schmid E. K. Schwenkspanner für Automatisierungszwecke
JP2023074709A (ja) * 2021-11-18 2023-05-30 Smc株式会社 支点開閉型エアチャック

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157696A1 (fr) * 1971-10-26 1973-06-08 Maac Ets
DE4111430A1 (de) * 1990-04-12 1991-10-17 Volker Schlueter Druckmittelbetaetigte spannvorrichtung
DE4307058A1 (de) * 1993-03-06 1994-09-08 David Fischer Spannvorrichtung zum Spannen von Werkstücken auf Maschinentischen oder Paletten

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724837A (en) * 1970-09-02 1973-04-03 Dover Corp Retracting clamp
US4721293A (en) * 1986-08-12 1988-01-26 Jergens, Inc. Self-locking clamping device
DE4311857A1 (de) * 1993-04-10 1994-10-13 David Fischer Spannvorrichtung zum Spannen von Werkstücken
DE4337658C1 (de) * 1993-11-04 1995-05-04 Frey Rudolf Spannpratze
DE29505573U1 (de) * 1995-03-31 1995-05-24 Maschinenfabrik Wagner GmbH & Co KG, 53804 Much Druckbetriebener Kraftschrauber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157696A1 (fr) * 1971-10-26 1973-06-08 Maac Ets
DE4111430A1 (de) * 1990-04-12 1991-10-17 Volker Schlueter Druckmittelbetaetigte spannvorrichtung
DE4307058A1 (de) * 1993-03-06 1994-09-08 David Fischer Spannvorrichtung zum Spannen von Werkstücken auf Maschinentischen oder Paletten

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MACHINES PRODUCTION, 7 December 1983 (1983-12-07), pages 26 - 29, XP002020562 *
YU.I.KUZNETZOV: "Universal Quick-Change Clamping Fixtures", SOVIET ENGINEERING RESEARCH, vol. 3, no. 3, March 1983 (1983-03-01), LEICESTERSHIRE, pages 89 - 91, XP002020561 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100017555A1 (it) * 2021-07-02 2023-01-02 Hydroblock S R L Apparecchio per il bloccaggio di pezzi su macchine utensili
WO2023275687A1 (fr) * 2021-07-02 2023-01-05 Hydroblock S.R.L. Appareil de serrage de pièces sur des machines-outils

Also Published As

Publication number Publication date
ATE207788T1 (de) 2001-11-15
DE19531890A1 (de) 1997-03-06
DE59608048D1 (de) 2001-12-06
ES2166420T3 (es) 2002-04-16
EP0761390B1 (fr) 2001-10-31

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