EP0836912A1 - Clamping device of the kind comprising a piston actuated lever - Google Patents

Clamping device of the kind comprising a piston actuated lever Download PDF

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Publication number
EP0836912A1
EP0836912A1 EP97410114A EP97410114A EP0836912A1 EP 0836912 A1 EP0836912 A1 EP 0836912A1 EP 97410114 A EP97410114 A EP 97410114A EP 97410114 A EP97410114 A EP 97410114A EP 0836912 A1 EP0836912 A1 EP 0836912A1
Authority
EP
European Patent Office
Prior art keywords
axis
clamping
lever
clamping device
ramps
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Withdrawn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
EP97410114A
Other languages
German (de)
French (fr)
Inventor
Thierry Bergamaschi
André Bouchet
Fernand Ferroud Plattet
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.)
Robotic
Original Assignee
Robotic
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 Robotic filed Critical Robotic
Publication of EP0836912A1 publication Critical patent/EP0836912A1/en
Withdrawn legal-status Critical Current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 device comprising a lever actuated hydraulically or pneumatically by a piston of the type used to hold workpieces or solder.
  • clamping devices of the type comprising a jack controlling the pivoting of a lever arm by through a link rod or several rods, in particular the clamping devices described by patent applications French published under the numbers 2 340 798 or 2 536 323.
  • the clamping devices described have the disadvantage of having a clamping force exerted by the lever during its passage from the inactive release position to the active clamping position which only reaches satisfactory values when said lever is in a position in the vicinity very close to its active clamping position, the clamping force having relatively low values during the majority of the passage between two positions.
  • the object of the present invention is to remedy the drawbacks presented by current devices thanks to simple and reliable means allowing the clamping device to present a clamping force satisfactory while providing a seal against various soils.
  • the clamping device intended to retain a construction part to be machined or to be welded, is of the type comprising a lever mounted pivoting around a axis of rotation relative to a device body to be actuated in pivoting by the displacement of the piston of a jack between a first so-called inactive release position, and a second position said active clamping position, said lever being connected to the end of the piston rod by means of control and connection means, said device comprising means for transmitting the force intended to allow a lever clamping force to be obtained important substantially constant while said lever pivots between an attack position remote from the clamping position and a position close to the lever clamping position, and is characterized in that the control and connection means comprise at least one link longitudinal axis linkage pivotally mounted, on the one hand on the lever tightening around a secondary pivot axis, and on the other hand either on a member of said control and connection means either directly on the piston rod around a main pivot axis, in that the force transmission means
  • the clamping device has a distance between the main pivot axis and the axis of secondary pivoting carried by the connecting rod which is lower at the orthogonal distance between the longitudinal axis of the cylinder and the axis of rotation of the clamping lever.
  • the guide means are constituted by blind guide lights located on the faces internal side walls of the device body, said lumens comprising vertical straight ramps extended by the ramps inclined.
  • the inclined ramps are located above the horizontal plane which contains the axis of rotation of the the sink.
  • the inclined ramps are at least partly curved.
  • the inclined ramps are inclined upwards and towards the lever with respect to the longitudinal axis of the jack in a median plane of general symmetry of the device Tightening.
  • the connecting rod is mounted swivels at one of its ends around a main pivot axis on an intermediate piece movable in translation, means of control and connection, said part being carried by the end of the piston rod and at the other of its ends around a secondary axis of pivoting on the mounting part or the arm of the clamping lever.
  • the clamping device may include a integral protection in rotation of the lever which has a wall upper circular shape and two side cheeks, the organ of protection can be made of aluminum.
  • the clamping device has a detection system.
  • the inclined ramps each have a lower portion facing upwards and towards the rear and an upper portion oriented upward and forward by relative to the longitudinal axis of the jack.
  • the distance between the axis of primary pivot and the secondary pivot axis is greater or equal to the orthogonal distance between the longitudinal axis of the cylinder and the axis of rotation of the clamping lever.
  • the piston rod undergoes angular movement back and forth and vice versa when the rollers run along the inclined ramps.
  • FIGS 1 to 11b illustrate different embodiments of the clamping device according to the invention.
  • Figures 1 to 9 illustrate a first embodiment particular of the clamping device according to the invention.
  • Figure 1 shows the clamping device and the cylinder in view lateral exterior in the inactive release position.
  • Figure 2 shows said device in external side view in its clamping position.
  • Figure 2a shows the device in its clamping position at side view along F.
  • Figure 2b shows the device in its clamping position at top view.
  • Figures 3a, 3b and 3c illustrate in longitudinal section in a median plane of the different clamping positions, Figures 3'b and 3'c illustrating the respective positions of the end rollers.
  • Figure 3a illustrates the device in the inactive position of release as shown in Figure 1.
  • Figure 3b illustrates the device between its inactive position release and its clamping position.
  • Figure 3'b is an enlarged view of the roller and the means of inclined guidance when the device is in the position of Figure 3b.
  • Figure 3c illustrates the locked device, the piston rod being in the locked position and the lever in the clamped position.
  • Figure 3'c is an enlarged view of the roller and the means of inclined guide when the device is in the position of FIG. 3c.
  • Figure 4 shows the body of the device in cross section according to AA.
  • FIG. 5 illustrates the body of the device in longitudinal section.
  • Figure 6 is a view similar to Figure 4 showing the clamping device with its constituent elements.
  • Figure 7 illustrates in perspective the arm protection member lever, the lever and the control and connecting means.
  • FIG. 8 represents two curves illustrating the clamping force of the lever depending on its position for the device according to the invention (line full) and for a conventional type device (dotted line).
  • FIG. 9 is an enlarged view of the roller, of a portion of the connecting rod and inclined guide means when the device is between its inactive release position and its clamping position.
  • FIGS 10a to 11b illustrate a second embodiment of the clamping device according to the invention.
  • Figures 10a to 10d respectively illustrate in section longitudinal in a median plane of the different positions of the clamping.
  • Figure 10a illustrates the inactive position of the device.
  • Figures 10b and 10c respectively represent two positions intermediaries.
  • Figure 10d illustrates the clamping position of the device.
  • FIG. 11a schematically represents the clamping ramp and a guide roller.
  • Figure 11b illustrates in a view similar to Figure 11a different positions of the end roller in the clamping ramp.
  • the clamping device (1) of plane of symmetry general median (P), includes a clamping lever bearing the reference general (2) pivotally mounted about a transverse axis of rotation (3) on a device body (4), allowing said lever to be movable between two positions, a first position (A) illustrated in FIG. 1 and in FIG. 3a, said inactive position for releasing the part to be welded or machined, and a second position (B) illustrated in FIG. 2, called the active position of Tightening.
  • the clamping lever (2) is pivotally actuated around its axis (3) by the displacement of the piston rod (6) of an axis cylinder (7) longitudinal (ZZ ') by means of control and link (MC).
  • Said means comprise at least one connecting rod connection (16) of longitudinal axis (RR ') pivotally mounted, on the one hand on the clamping lever (2) around a secondary pivot axis (23), and on the other hand around a main pivot axis (22) or on another member of said control and connection means (MC) either directly on the piston rod (6), and are thus intended to transmit to the clamping lever (2) the force supplied to the device (1) by the jack (7).
  • the clamping device (1) comprises force transmission means (MT) intended to allow obtaining a significant and satisfactory clamping force [EF1], substantially constant when the lever is pivoted between a position close to a so-called attack position (C) and a position close to its position active clamping (B).
  • MT force transmission means
  • Clamping devices of the conventional type known in the art anterior have relatively low clamping force (EF) during pivoting of the lever from its inactive position (A) to a position (K) close to its active clamping position (B), said force increasing suddenly between said position (K) and the clamping position (B), as shown in Figure 8 illustrating in dotted line the clamping force of the lever (EF) depending on the position of the lever relative to its position tightening active, i.e. depending on the parameter (k) illustrated in figure 3b.
  • EF clamping force
  • the device (1) according to the invention is intended to allow obtaining a satisfactory clamping force (EF) (corresponding to a force (EF1) illustrated in figure 8) and constant for positions (K1, K2, K3) of the lever clamping away from clamping position (B) and position (K) as shown by the curve illustrated in solid lines in FIG. 8, this for a identical force supplied by the jack (7) to the clamping device (1) that in the case of conventional type devices.
  • EF clamping force
  • the clamping device (1) comprises means for guide (MG) comprising inclined guide means (MI); said guide means (MG) being intended to guide the main axis of pivot (22) of the connecting rod (16) in a path at less inclined in relation to the longitudinal axis (ZZ ') of the jack, they thus constitute the means of transmission of the force (MT) of the device.
  • MG guide
  • MI inclined guide means
  • the body (4) of the clamping device (1) consists of an upper part (9a) at the interior of which the clamping lever (2) pivots, and of a part lower (9b) in which slides the piston rod (6) of the cylinder (7).
  • the clamping device (1) includes fixing means (MF) of said cylinder, so as to allow adaptation to said device several types of cylinder, as well as the easy replacement of a cylinder defective.
  • said cylinder (7) is fixed to the lower part (9b) of the device (1) by means of four rods threaded (43) arranged longitudinally parallel to the axis (ZZ ') at four corners of its cross section and which thus constitute said fixing means (MF).
  • the rod piston (6) movable in translation is cylindrical in shape;
  • the seal between the cylinder (7) and the piston rod (6) can advantageously be obtained using lip seals without guide so as to allow the inclination of said rod while minimizing the wear of the joints.
  • the upper part (9a) of the body (4) of the device clamping has the general shape of a yoke (100) which is formed by two parallel side walls (10a, 10b) creating between them a slot (11) of width L1 intended for the passage of the lever (2), said side walls parallel (10a, 10b) are, moreover, pierced with a transverse hole (12) axis (XX ') in which is engaged the transverse axis of rotation (3) of the lever (2) as illustrated in Figure 2a, 4 and 5.
  • Said lever (2) comprises a lever arm (14) extending a embedding part (13) which constitutes its actuation and pivoting on which is pivotally mounted the connecting rod (16) of control and connection means (MC) as illustrated in FIGS. 3a, 3b, 3c and 7.
  • the lever (2) advantageously comprises a member for protection (15), as shown in FIGS. 2a, 2b and 7 secured in rotation of the lever arm (14), said member being intended to cover the parts of the lever (2) which, when pivoted from its clamping position (B) in its inactive position (A), move from the outside (EX) of the yoke (100) inside (IN) thereof.
  • Said organ comprises, part, an upper wall (15a) of width L2 adjusted to the width L1 of the slot and whose external shape is circular with radius R1, centered on the axis (XX ') and, on the other hand, two lateral protective cheeks (40a, 40b) extending said upper wall (15a) and the external faces of which are thus distant from the width L2.
  • Said cheeks (40a, 40b) have the shape of a circle sector centered on the axis (XX ') of radius R1.
  • the organ of protection is advantageously achieved according to the use made of the device (1) in a material intended to allow projections and other dirt does not adhere to it, such as, for example, aluminum alloy when using the device (1) to perform welding on steel parts. Note, moreover, that it is hollowed out in its rear part so not to interfere with the internal mechanism of the device when pivoting the lever from its active clamping position (B) to its release position (AT).
  • the lower part (9a) of the body (4) forms a closed chamber (17), inside which is arranged the actual mechanism of the clamping device (1).
  • She is consisting of two side walls (18a, 18b) extending respectively the two parallel side walls (10a, 10b) of the yoke (100) as well as a rear wall (19) and a front wall (20), the rear wall extending advantageously up to the slot (11) of the yoke (100).
  • the lower part (9a) of the clamping device (1) is mounted directly on a cylinder (7) pneumatic or hydraulic with longitudinal axis (ZZ ') whose end (8) of the piston rod (6) is intended to move substantially vertically between a relaxed position (A1), illustrated in FIG. 3a, corresponding to the inactive position (A) of the lever (2) and a so-called position lock (B1), illustrated in Figure 3c where the lever is in its active clamping position (B).
  • control means and connecting (MC) are constituted by a movable intermediate piece in translation (21) carried by the piston rod (6) of the jack (7) and integral moving the end (8) of said rod and by the connecting rod link (16) pivotally mounted at one of its ends on said part intermediate around the main pivot axis (22) and mounted at the other of its ends on the lever arm (14) or the part mounting (13) of the clamping lever (2) around a secondary axis pivot (23), as shown in Figures 3a, 3b and 3c.
  • the length of the link (L5) i.e.
  • Said intermediate piece has the form general of a U consisting of an end wall (21c) and two walls vertical lateral (21a, 21b) distant by a distance L3, like the shows Figures 6 and 7.
  • Said vertical side walls bear transversely at their upper ends (25a, 25b) the main axis pivot (22) on which is mounted the connecting rod (16).
  • Said axis (22) is provided at each of its ends with a roller or bearing end (24a, 24b) intended to be guided in its movement substantially vertical by the guide means (MG).
  • the connecting rod (16) is mounted to one of its ends between the vertical side walls (21a, 21b) of the part intermediate (21) and at the other of its ends in a slot (26) located in the mounting part (13) of the lever (2).
  • the device could for example include two connecting rods parallels arranged on either side of the sliding part and the embedding part of the lever without leaving the field of protection of the invention.
  • said link (16) and its axis (22) could be mounted directly on the end of the piston rod, for example.
  • the means guide (MG) intended to guide the main pivot axis (22) are constituted by two blind guide lights (30a, 30b) located on the internal faces (28a, 28b) of the side walls (10a, 10b, 18a, 18b) of the body (4) of the device (1), as shown in Figures 4, 5 and 6.
  • Said blind lights (30a, 30b) each have a guide ramp vertical straight (50a, 50b) extended by a guide ramp inclined (27a, 27b), said inclined ramps constituting the means of inclined guide (MI) of the guide means (MG).
  • the main pivot axis (22) and therefore the part intermediate (21) and the end (8) of the piston rod (6) which are there united are driven in a rectilinear and vertical axis trajectory (ZZ '), on the one hand, then successively in a trajectory inclined by ratio to said axis (ZZ '), on the other hand, when the end rollers (24a, 24b) of said main axis are guided in the lights (30a, 30b) successively along the vertical straight ramps (50a, 50b) then inclined ramps (27a, 27b) thus allowing the piston rod (6) to move between its relaxed positions (A1) and its position locking (B1) illustrated respectively in Figures 3a and 3c.
  • said positions (A1, B1) of the end of the piston rod (8) correspond respectively to the position (A'1) of the rollers (24a, 24b) on the straight guide rails (50a, 50b) and at the position (B'1) of said rollers on the inclined ramps (27a, 27b) illustrated in Figure 3'b and 3'c.
  • said ramps (27a, 27b) are made up of independent parts intended to be positioned and fixed in ramp housings located in the internal faces (28a, 28b) of the side walls (10a, 10b, 18a, 18b) of the body (4). Said ramps are positioned so that they are traversed by the end rollers (24a, 24b) of the axis main pivot (22) between a first position of the rollers called attack position (C'1), illustrated in FIG. 3'b and a second position of the rollers called locking position (B'1) illustrated in Figure 3'c.
  • the position (C'1) of the rollers corresponds to a position (C1) of the end of the piston rod (8) located between its relaxed position (A1) and its intermediate clamping position (D1) as well as at a position intermediate (C) of the lever as illustrated in FIG. 3b
  • the position (B'1) of the rollers corresponds to the locking position of the rod (B1) illustrated in Figure 3c.
  • said ramps are positioned in the space above the plane horizontal (H1) containing the axis of rotation (3) of the lever (2).
  • the ramps (27a, 27b) are inclined advantageously in the median plane (P) so as to extend towards the high (HA) in the direction of the clamping lever (2). They are advantageously curved either over their entire length as the shows Figures 3'b and 3'c or either only on the portion where the rollers pass from their attack position (C'1) to their position clamping intermediate (D'1) corresponding to the intermediate position (D1) of the rod, then can be straight between positions clamping (D'1) and locking (B'1) intermediate rollers.
  • the longitudinal axis (RR ') of said link forms an angle ⁇ with the straight line (Q), said line (Q) being the line perpendicular to the tangent (T) to the inclined ramp at point M traversed by the roller as shown in the figure 9.
  • the inclined ramps (27a, 27b) are curved so that the angle ⁇ is substantially constant during said course rollers between their attack position (C'1) and a position close to their intermediate clamping position (D'1).
  • rollers ends (24a, 24b) are guided in the lights (30a, 30b) according to the longitudinal axis (ZZ ') between the detent (A'1) and attack positions (C'1) then along an inclined path relative to the axis (ZZ ') between the attack (C'1) and locking (B'1) position via the intermediate clamping position (D'1).
  • said ramps could be machined directly inside the blind lights; however, the curvature ramps must be machined with precision in order to obtain an angle ⁇ substantially constant and therefore to obtain the expected increase effect of the transmitted effort, it therefore seems preferable to carry them out separately before positioning and fixing them in housings located in the extension of the vertical straight ramps of the blind lights.
  • the parts comprising said inclined ramps can be advantageously made of steel.
  • the vertical side walls (21a, 21b) of the intermediate piece (21) are spaced a distance L3 greater to the width L2 of the upper wall (15a) of the protection member (15), so that it can, when pivoted towards the inactive position (A) of the lever fit in the space (29) located between said vertical walls.
  • the organ (15) of external shape circular is hollowed out in its rear portion so as not to interfere with the main pivot axis (22) in the inactive release position (A) of the clamping lever (2).
  • the clamping device (1) includes a detection system (SD) which can advantageously be inductive type comprising at least two sensors (41a, 41b) arranged at the interior of the chamber (17) of the body (4) intended to detect the position in which is located the clamping device, i.e. the arm of lever (14) or the piston rod (6), by sending a signal to a check when the clamping device is in their position detection.
  • SD detection system
  • Said sensors (41a, 41b), as shown in FIGS. 3a, 3b, 3c and 6 can be arranged along the front wall (20) and against a side wall (18b) of the body (4) in order to be able to detect the position a detection finger (42) integral with the intermediate piece (21).
  • a variant consists in modifying the shape of the arm of lever to give it a suitable shape so that the clamping device can clamp a piece to be welded against a vertical plane or an inclined plane, for example.
  • the inclined ramps (27a, 27b) are produced so as to obtain an angle ⁇ substantially constant, i.e. an angle ⁇ whose variations around its value average are low, between 1 and 5 ° of travel when the end rollers (24a, 24b) run through said inclined ramps.
  • the inclined guide rails (27a, 27b) have a configuration different from that of the first embodiment.
  • the guide ramps (27a, 27b) are no longer inclined towards the high (HA) and forward (AV), but have a lower portion (51) tilted upwards (HA) and rearwards (AR) opposite the lever (2), and an upper portion (52) which is inclined upwards (HA) and forward (AV).
  • the lower portion (51) extends the vertical straight ramps (50a, 50b) and goes towards the rear relative to the axis (ZZ '), while the upper portion (52) is then heads forward and goes back to the front of the axis (ZZ '). Note that the curvature and inclination of the upper (52) and lower (51) portions are calculated so that the angle ⁇ as defined above remains substantially constant when the rollers (24a, 24b) travel said portions.
  • the piston rod (6) of the cylinder (7) undergoes an angular movement from front (AV) to rear (AR) of on either side of the axis (ZZ ') unlike the embodiment previous where the rod underwent an angular movement in an area located only at the front (AV) relative to the axis (ZZ ').
  • the overall value of the angular movement from front to back caused by the course of the ramps inclined by the pebbles is substantially identical in the two embodiments.
  • this second embodiment makes it possible to obtain a clearance which takes place around the equilibrium position where the piston rod is coincident with the longitudinal axis (ZZ ') of the jack (7).
  • the distance (L5) between the main and secondary axes (22, 23) carried by the link (16) is identical to the distance (L6) between the axis (XX ') of the lever (2) and the axis longitudinal (ZZ ') of the cylinder (7). It goes without saying that the distance (L5) could be greater than said distance (L6), without however leaving the field of protection of the invention.
  • connection (21), the piston rod (6) and the piston of the jack constitute a sub rigid assembly which carries the end rollers (24a, 24b) of the axis main (22) and whose inclination varies slightly when the rollers roam the inclined ramps.

Abstract

The present invention concerns a colour reversible photographic product.
In particular, it concerns a silver halide photographic product which comprises a mixture of emulsions containing a tabular grain emulsion.
This photographic product improves the rendering of the details of the dye image.

Description

La présente invention concerne un dispositif de serrage comprenant un levier actionné hydrauliquement ou pneumatiquement par un piston du type de ceux utilisés pour maintenir des pièces à usiner ou à souder.The present invention relates to a clamping device comprising a lever actuated hydraulically or pneumatically by a piston of the type used to hold workpieces or solder.

Dans le domaine industriel, il est nécessaire de retenir les pièces afin de pouvoir, par exemple, les usiner ou les assembler par soudage. On a recours, bien entendu, à différents dispositifs comme, par exemple, des serre-joints ou des systèmes de grenouillères, manoeuvrés manuellement, qui présentent un certain nombre d'inconvénients. Aussi, les constructeurs ont mis au point des systèmes de serrages automatiques, qui comprennent au moins un levier actionné d'une position inactive de libération vers une position active de serrage et inversement, par le déplacement d'un piston pouvant être commandé pneumatiquement ou hydrauliquement.In the industrial field, it is necessary to retain the parts in order to be able, for example, to machine or assemble them by welding. We uses, of course, various devices such as, for example, clamps or latches systems, operated manually, which have a number of drawbacks. Also, the manufacturers have developed automatic locking systems, which comprise at least one lever actuated from an inactive position of release to an active clamping position and vice versa, by the displacement of a piston which can be controlled pneumatically or hydraulically.

On connaít de nombreux dispositifs de serrage du type comportant un vérin commandant le pivotement d'un bras de levier par l'intermédiaire d'une biellette de liaison ou de plusieurs biellettes, notamment les dispositifs de serrage décrits par les demandes de brevets français publiées sous les numéros 2 340 798 ou 2 536 323.We know many clamping devices of the type comprising a jack controlling the pivoting of a lever arm by through a link rod or several rods, in particular the clamping devices described by patent applications French published under the numbers 2 340 798 or 2 536 323.

Dans l'ensemble de ces documents, les dispositifs de serrage décrits présentent l'inconvénient d'avoir une force de serrage exercée par le levier lors de son passage de la position inactive de libération vers la position active de serrage qui n'atteint des valeurs satisfaisantes que lorsque ledit levier se trouve dans une position située au voisinage très proche de sa position active de serrage, la force de serrage présentant des valeurs relativement faibles pendant la majorité du passage entre les deux positions.Throughout these documents, the clamping devices described have the disadvantage of having a clamping force exerted by the lever during its passage from the inactive release position to the active clamping position which only reaches satisfactory values when said lever is in a position in the vicinity very close to its active clamping position, the clamping force having relatively low values during the majority of the passage between two positions.

En outre, les différents dispositifs décrits sont généralement lourds, compliqués et présentent souvent des ouvertures permettant aux copeaux, aux salissures ou aux projections de soudure de s'introduire à l'intérieur du dispositif empêchant ainsi le bon fonctionnement du mécanisme.In addition, the various devices described are generally heavy, complicated and often have openings allowing shavings, dirt or splashes of solder to penetrate inside the device thus preventing the proper functioning of the mechanism.

La présente invention a pour but de remédier aux inconvénients présentés par les dispositifs actuels grâce à des moyens simples et fiables permettant au dispositif de serrage de présenter un effort de serrage satisfaisant tout en offrant une étanchéité aux différentes salissures.The object of the present invention is to remedy the drawbacks presented by current devices thanks to simple and reliable means allowing the clamping device to present a clamping force satisfactory while providing a seal against various soils.

Ainsi, selon sa caractéristique principale, le dispositif de serrage selon l'invention, destiné à retenir une pièce de construction à usiner ou à souder, est du type comprenant un levier monté pivotant autour d'un axe de rotation par rapport à un corps de dispositif pour être actionné en pivotement par le déplacement du piston d'un vérin entre une première position dite position inactive de libération, et une deuxième position dite position active de serrage, ledit levier étant relié à l'extrémité de la tige de piston par l'intermédiaire de moyens de commande et de liaison , ledit dispositif comportant des moyens de transmission de l'effort destinés à permettre l'obtention d'un effort de serrage du levier important sensiblement constant pendant que ledit levier pivote entre une position d'attaque éloignée de la position de serrage et une position voisine de la position de serrage du levier, et est caractérisé en ce que les moyens de commande et de liaison comportent au moins une biellette de liaison d'axe longitudinal montée pivotante, d'une part sur le levier de serrage autour d'un axe secondaire de pivotement, et d'autre part soit sur un organe desdits moyens de commande et de liaison soit directement sur la tige de piston autour d'un axe principal de pivotement, en ce que les moyens de transmission de l'effort sont constitués par des moyens de guidage destinés à guider l'axe principal de pivotement dans une trajectoire au moins en partie inclinée par rapport à l'axe longitudinal du dispositif, les moyens de guidage comprenant des moyens de guidage inclinés constitués par des rampes inclinées destinées à guider des galets d'extrémité disposés sur l'axe principal de pivotement selon une trajectoire au moins en partie inclinée par rapport à l'axe longitudinal du dispositif et en ce que les rampes inclinées sont incurvées de manière à ce que l'angle σ formé en un point M des rampes inclinées entre l'axe longitudinal de la biellette de liaison et la droite perpendiculaire à la tangente à la rampe inclinée au point M où se situe le galet soit sensiblement constant lorsque les galets d'extrémité parcourent lesdites rampes entre une position d'attaque et une position voisine d'une position intermédiaire de serrage.Thus, according to its main characteristic, the clamping device according to the invention, intended to retain a construction part to be machined or to be welded, is of the type comprising a lever mounted pivoting around a axis of rotation relative to a device body to be actuated in pivoting by the displacement of the piston of a jack between a first so-called inactive release position, and a second position said active clamping position, said lever being connected to the end of the piston rod by means of control and connection means, said device comprising means for transmitting the force intended to allow a lever clamping force to be obtained important substantially constant while said lever pivots between an attack position remote from the clamping position and a position close to the lever clamping position, and is characterized in that the control and connection means comprise at least one link longitudinal axis linkage pivotally mounted, on the one hand on the lever tightening around a secondary pivot axis, and on the other hand either on a member of said control and connection means either directly on the piston rod around a main pivot axis, in that the force transmission means consist of guide means for guiding the main pivot axis in a trajectory at least partially inclined with respect to the axis longitudinal of the device, the guide means comprising inclined guide means consisting of inclined ramps intended to guide end rollers arranged on the main axis of pivoting along a path at least partly inclined with respect to to the longitudinal axis of the device and in that the inclined ramps are curved so that the angle σ formed at a point M of the ramps inclined between the longitudinal axis of the connecting rod and the right perpendicular to the tangent to the inclined ramp at point M where is located the roller is substantially constant when the end rollers traverse said ramps between an attack position and a position close to an intermediate clamping position.

Selon un premier mode de réalisation, le dispositif de serrage présente une distance entre l'axe de pivotement principal et l'axe de pivotement secondaire portée par la biellette de liaison qui est inférieure à la distance orthogonale entre l'axe longitudinal du vérin et l'axe de rotation du levier de serrage.According to a first embodiment, the clamping device has a distance between the main pivot axis and the axis of secondary pivoting carried by the connecting rod which is lower at the orthogonal distance between the longitudinal axis of the cylinder and the axis of rotation of the clamping lever.

Selon une autre caractéristique, les moyens de guidage sont constitués par des lumières borgnes de guidage situées sur les face internes des parois latérales du corps du dispositif, lesdites lumières comprenant des rampes rectilignes verticales prolongées par les rampes inclinées.According to another characteristic, the guide means are constituted by blind guide lights located on the faces internal side walls of the device body, said lumens comprising vertical straight ramps extended by the ramps inclined.

En outre, selon un mode de réalisation les rampes inclinées sont situées au dessus du plan horizontal qui contient l'axe de rotation du levier.In addition, according to one embodiment, the inclined ramps are located above the horizontal plane which contains the axis of rotation of the the sink.

Selon une variante, les rampes inclinées sont au moins en partie incurvées.According to a variant, the inclined ramps are at least partly curved.

Selon une caractéristique complémentaire, les rampes inclinées sont inclinées vers le haut et vers le levier par rapport à l'axe longitudinal du vérin dans un plan médian de symétrie général du dispositif de serrage.According to an additional characteristic, the inclined ramps are inclined upwards and towards the lever with respect to the longitudinal axis of the jack in a median plane of general symmetry of the device Tightening.

Selon une autre caractéristique, la biellette de liaison est montée pivotante à une de ses extrémités autour d'un axe principal de pivotement sur une pièce intermédiaire mobile en translation des moyens de commande et de liaison, ladite pièce étant portée par l'extrémité de la tige de piston et à l'autre de ses extrémités autour d'un axe secondaire de pivotement sur la partie d'encastrement ou le bras du levier de serrage.According to another characteristic, the connecting rod is mounted swivels at one of its ends around a main pivot axis on an intermediate piece movable in translation, means of control and connection, said part being carried by the end of the piston rod and at the other of its ends around a secondary axis of pivoting on the mounting part or the arm of the clamping lever.

De plus, le dispositif de serrage peut comprendre un organe de protection solidaire en rotation du levier qui comporte une paroi supérieure de forme circulaire et deux joues latérales, l'organe de protection peut être réalisé en aluminium.In addition, the clamping device may include a integral protection in rotation of the lever which has a wall upper circular shape and two side cheeks, the organ of protection can be made of aluminum.

Selon une caractéristique complémentaire, le dispositif de serrage comporte un système de détection.According to an additional characteristic, the clamping device has a detection system.

Selon un deuxième mode de réalisation, les rampes inclinées comportent chacune une portion inférieure orientée vers le haut et vers l'arrière et une portion supérieure orientée vers le haut et l'avant par rapport à l'axe longitudinal du vérin.According to a second embodiment, the inclined ramps each have a lower portion facing upwards and towards the rear and an upper portion oriented upward and forward by relative to the longitudinal axis of the jack.

Selon ce deuxième mode de réalisation, la distance entre l'axe de pivotement principal et l'axe de pivotement secondaire est supérieure ou égale à la distance orthogonale entre l'axe longitudinal du vérin et l'axe de rotation du levier de serrage.According to this second embodiment, the distance between the axis of primary pivot and the secondary pivot axis is greater or equal to the orthogonal distance between the longitudinal axis of the cylinder and the axis of rotation of the clamping lever.

Selon une caractéristique complémentaire, la tige de piston subit un débattement angulaire d'avant en arrière et inversement lorsque les galets parcourent les rampes inclinées.According to an additional characteristic, the piston rod undergoes angular movement back and forth and vice versa when the rollers run along the inclined ramps.

D'autres caractéristiques et avantages de l'invention se dégageront de la description qui va suivre en regard des dessins annexés qui ne sont donnés qu'à titre d'exemples non limitatifs.Other characteristics and advantages of the invention will emerge of the description which will follow with regard to the appended drawings which are not given only by way of nonlimiting examples.

Les figures 1 à 11b illustrent différents modes de réalisation du dispositif de serrage selon l'invention.Figures 1 to 11b illustrate different embodiments of the clamping device according to the invention.

Les figures 1 à 9 illustrent un premier mode de réalisation particulier du dispositif du serrage selon l'invention.Figures 1 to 9 illustrate a first embodiment particular of the clamping device according to the invention.

La figure 1 représente le dispositif de serrage et le vérin en vue latérale extérieure dans la position inactive de libération.Figure 1 shows the clamping device and the cylinder in view lateral exterior in the inactive release position.

La figure 2 représente ledit dispositif en vue latérale extérieure dans sa position de serrage.Figure 2 shows said device in external side view in its clamping position.

La figure 2a représente le dispositif dans sa position de serrage en vue de coté selon F. Figure 2a shows the device in its clamping position at side view along F.

La figure 2b représente le dispositif dans sa position de serrage en vue de dessus.Figure 2b shows the device in its clamping position at top view.

Les figures 3a, 3b et 3c illustrent en coupe longitudinale dans un plan médian des positions différentes du serrage, les figures 3'b et 3'c illustrant les positions respectives des galets d'extrémité.Figures 3a, 3b and 3c illustrate in longitudinal section in a median plane of the different clamping positions, Figures 3'b and 3'c illustrating the respective positions of the end rollers.

La figure 3a illustre le dispositif dans la position inactive de libération tel qu'illustré à la figure 1.Figure 3a illustrates the device in the inactive position of release as shown in Figure 1.

La figure 3b illustre le dispositif entre sa position inactive de libération et sa position de serrage.Figure 3b illustrates the device between its inactive position release and its clamping position.

La figure 3'b est une vue agrandie du galet et des moyens de guidage inclinés lorsque le dispositif est dans la position de la figure 3b.Figure 3'b is an enlarged view of the roller and the means of inclined guidance when the device is in the position of Figure 3b.

La figure 3c illustre le dispositif verrouillé, la tige de piston étant en position de verrouillage et le levier en position de serrage.Figure 3c illustrates the locked device, the piston rod being in the locked position and the lever in the clamped position.

La figure 3'c est une vue agrandie du galet et des moyens de guidage inclinés lorsque le dispositif est dans la position de la figure 3c.Figure 3'c is an enlarged view of the roller and the means of inclined guide when the device is in the position of FIG. 3c.

La figure 4 représente le corps du dispositif en coupe transversale selon AA.Figure 4 shows the body of the device in cross section according to AA.

La figure 5 illustre le corps du dispositif en coupe longitudinale.FIG. 5 illustrates the body of the device in longitudinal section.

La figure 6 est une vue similaire à la figure 4 représentant le dispositif de serrage avec ses éléments le constituant.Figure 6 is a view similar to Figure 4 showing the clamping device with its constituent elements.

La figure 7 illustre en perspective l'organe de protection du bras de levier, le levier et les moyens de commande et de liaison.Figure 7 illustrates in perspective the arm protection member lever, the lever and the control and connecting means.

La figure 8 représente deux courbes illustrant l'effort de serrage du levier en fonction de sa position pour le dispositif selon l'invention (trait plein) et pour un dispositif de type classique (trait pointillé).FIG. 8 represents two curves illustrating the clamping force of the lever depending on its position for the device according to the invention (line full) and for a conventional type device (dotted line).

La figure 9 est une vue agrandie du galet, d'une portion de la biellette de liaison et des moyens de guidage inclinés lorsque le dispositif est entre sa position inactive de libération et sa position de serrage. FIG. 9 is an enlarged view of the roller, of a portion of the connecting rod and inclined guide means when the device is between its inactive release position and its clamping position.

Les figures 10a à 11b illustrent un deuxième mode de réalisation du dispositif de serrage selon l'invention.Figures 10a to 11b illustrate a second embodiment of the clamping device according to the invention.

Les figures 10a à 10d illustrent respectivement en coupe longitudinale dans un plan médian des positions différentes du serrage.Figures 10a to 10d respectively illustrate in section longitudinal in a median plane of the different positions of the clamping.

La figure 10a illustre la position inactive du dispositif.Figure 10a illustrates the inactive position of the device.

Les figures 10b et 10c représentent respectivement deux positions intermédiaires.Figures 10b and 10c respectively represent two positions intermediaries.

La figure 10d illustre la position de serrage du dispositif.Figure 10d illustrates the clamping position of the device.

La figure 11a représente schématiquement la rampe de serrage et un galet de guidage.FIG. 11a schematically represents the clamping ramp and a guide roller.

La figure 11b illustre selon une vue similaire à la figure 11a différentes positions du galet d'extrémité dans la rampe de serrage.Figure 11b illustrates in a view similar to Figure 11a different positions of the end roller in the clamping ramp.

Le dispositif de serrage (1) selon l'invention, de plan de symétrie général médian (P), comprend un levier de serrage portant la référence générale (2) monté pivotant autour d'un axe transversal de rotation (3) sur un corps de dispositif (4), permettant audit levier d'être mobile entre deux positions, une première position (A) illustrée figure 1 et figure 3a, dite position inactive de libération de la pièce à souder ou à usiner, et une deuxième position (B) illustrée figure 2, dite position active de serrage. Le levier de serrage (2) est actionné en pivotement autour de son axe (3) par le déplacement de la tige de piston (6) d'un vérin (7) d'axe longitudinal (ZZ') par l'intermédiaire de moyens de commande et de liaison (MC). Lesdits moyens comportent au moins une biellette de liaison (16) d'axe longitudinal (RR') montée pivotante, d'une part sur le levier de serrage (2) autour d'un axe secondaire de pivotement (23), et d'autre part autour d'un axe principal de pivotement (22) soit sur un autre organe desdits moyens de commande et de liaison (MC) soit directement sur la tige de piston (6), et sont ainsi destinés à transmettre au levier de serrage (2) l'effort fourni au dispositif (1) par le vérin (7).The clamping device (1) according to the invention, of plane of symmetry general median (P), includes a clamping lever bearing the reference general (2) pivotally mounted about a transverse axis of rotation (3) on a device body (4), allowing said lever to be movable between two positions, a first position (A) illustrated in FIG. 1 and in FIG. 3a, said inactive position for releasing the part to be welded or machined, and a second position (B) illustrated in FIG. 2, called the active position of Tightening. The clamping lever (2) is pivotally actuated around its axis (3) by the displacement of the piston rod (6) of an axis cylinder (7) longitudinal (ZZ ') by means of control and link (MC). Said means comprise at least one connecting rod connection (16) of longitudinal axis (RR ') pivotally mounted, on the one hand on the clamping lever (2) around a secondary pivot axis (23), and on the other hand around a main pivot axis (22) or on another member of said control and connection means (MC) either directly on the piston rod (6), and are thus intended to transmit to the clamping lever (2) the force supplied to the device (1) by the jack (7).

Selon l'invention, le dispositif de serrage (1) comprend des moyens de transmission de l'effort (MT) destinés à permettre l'obtention d'un effort de serrage [EF1] important et satisfaisant, sensiblement constant lors du pivotement du levier entre une position voisine d'une position dite position d'attaque (C) et une position voisine de sa position active de serrage (B).According to the invention, the clamping device (1) comprises force transmission means (MT) intended to allow obtaining a significant and satisfactory clamping force [EF1], substantially constant when the lever is pivoted between a position close to a so-called attack position (C) and a position close to its position active clamping (B).

Les dispositifs de serrage de type classique connus dans l'art antérieur présentent un effort de serrage (EF) relativement faible pendant le pivotement du levier, de sa position inactive (A) jusqu'à une position (K) voisine de sa position active de serrage (B), ledit effort augmentant brusquement entre ladite position (K) et la position de serrage (B), comme le montre la figure 8 illustrant en pointillé l'effort de serrage du levier (EF) en fonction de la position du levier par rapport à sa position active de serrage, c'est-à-dire en fonction du paramètre (k) illustré figure 3b. Le dispositif (1) selon l'invention est destiné à permettre l'obtention d'un effort de serrage (EF) satisfaisant (correspondant à un effort (EF1) illustré figure 8) et constant pour des position (K1, K2, K3) du levier de serrage éloignées de la position de serrage (B) et de la position (K) comme le montre la courbe illustrée en traits pleins figure 8, ceci pour un effort identique fourni par le vérin (7) au dispositif de serrage (1) que dans le cas des dispositifs de type classique.Clamping devices of the conventional type known in the art anterior have relatively low clamping force (EF) during pivoting of the lever from its inactive position (A) to a position (K) close to its active clamping position (B), said force increasing suddenly between said position (K) and the clamping position (B), as shown in Figure 8 illustrating in dotted line the clamping force of the lever (EF) depending on the position of the lever relative to its position tightening active, i.e. depending on the parameter (k) illustrated in figure 3b. The device (1) according to the invention is intended to allow obtaining a satisfactory clamping force (EF) (corresponding to a force (EF1) illustrated in figure 8) and constant for positions (K1, K2, K3) of the lever clamping away from clamping position (B) and position (K) as shown by the curve illustrated in solid lines in FIG. 8, this for a identical force supplied by the jack (7) to the clamping device (1) that in the case of conventional type devices.

Pour ce faire, le dispositif de serrage (1) comporte des moyens de guidage (MG) comprenant des moyens de guidage inclinés (MI) ; lesdits moyens de guidage (MG) étant destinés à guider l'axe principal de pivotement (22) de la biellette de liaison (16) dans une trajectoire au moins en partie inclinée par rapport à l'axe longitudinal (ZZ') du vérin, ils constituent ainsi les moyens de transmission de l'effort (MT) du dispositif.To do this, the clamping device (1) comprises means for guide (MG) comprising inclined guide means (MI); said guide means (MG) being intended to guide the main axis of pivot (22) of the connecting rod (16) in a path at less inclined in relation to the longitudinal axis (ZZ ') of the jack, they thus constitute the means of transmission of the force (MT) of the device.

Selon un mode de réalisation préféré de l'invention, le corps (4) du dispositif de serrage (1) est constitué d'une partie supérieure (9a) à l'intérieur de laquelle pivote le levier de serrage (2), et d'une partie inférieure (9b) dans laquelle coulisse la tige de piston (6) du vérin (7). Notons que le dispositif de serrage (1) comporte des moyens de fixation (MF) dudit vérin, de manière à permettre l'adaptation audit dispositif de plusieurs types de vérin, ainsi que le remplacement aisé d'un vérin défectueux. According to a preferred embodiment of the invention, the body (4) of the clamping device (1) consists of an upper part (9a) at the interior of which the clamping lever (2) pivots, and of a part lower (9b) in which slides the piston rod (6) of the cylinder (7). Note that the clamping device (1) includes fixing means (MF) of said cylinder, so as to allow adaptation to said device several types of cylinder, as well as the easy replacement of a cylinder defective.

Selon le mode de réalisation illustré, ledit vérin (7) est fixé sur la partie inférieure (9b) du dispositif (1) par l'intermédiaire de quatre tiges filetées (43) disposées longitudinalement parallèlement à l'axe (ZZ') aux quatre coins de sa section transversale et qui constituent ainsi lesdits moyens de fixation (MF). Selon ce mode de réalisation préféré, la tige de piston (6) mobile en translation est de forme cylindrique ; de plus, l'étanchéité entre le vérin (7) et la tige de piston (6) peut avantageusement être obtenue à l'aide de joints à lèvres sans guidage de manière à permettre l'inclinaison de ladite tige en minimisant l'usure des joints.According to the illustrated embodiment, said cylinder (7) is fixed to the lower part (9b) of the device (1) by means of four rods threaded (43) arranged longitudinally parallel to the axis (ZZ ') at four corners of its cross section and which thus constitute said fixing means (MF). According to this preferred embodiment, the rod piston (6) movable in translation is cylindrical in shape; Moreover, the seal between the cylinder (7) and the piston rod (6) can advantageously be obtained using lip seals without guide so as to allow the inclination of said rod while minimizing the wear of the joints.

Selon le mode de réalisation préféré de l'invention illustré figures 3a, 3b, 3c, 4, 5, 6 et 7, la partie supérieure (9a) du corps (4) du dispositif de serrage a la forme générale d'une chape (100) qui est formée par deux parois latérales parallèles (10a, 10b) créant entre elles une fente (11) de largeur L1 destinée au passage du levier (2), lesdites parois latérales parallèles (10a, 10b) sont, par ailleurs, percées d'un trou transversal (12) d'axe (XX') dans lequel est engagé l'axe transversal de rotation (3) du levier (2) tel qu'illustré figure 2a, 4 et 5.According to the preferred embodiment of the invention illustrated in figures 3a, 3b, 3c, 4, 5, 6 and 7, the upper part (9a) of the body (4) of the device clamping has the general shape of a yoke (100) which is formed by two parallel side walls (10a, 10b) creating between them a slot (11) of width L1 intended for the passage of the lever (2), said side walls parallel (10a, 10b) are, moreover, pierced with a transverse hole (12) axis (XX ') in which is engaged the transverse axis of rotation (3) of the lever (2) as illustrated in Figure 2a, 4 and 5.

Ledit levier (2) comporte un bras de levier (14) prolongeant une partie d'encastrement (13) qui constitue sa partie d'actionnement et de pivotement sur lequel est montée pivotante la biellette de liaison (16) des moyens de commande et de liaison (MC) tel qu'illustré figures 3a, 3b, 3c et 7. De plus, le levier (2) comporte avantageusement un organe de protection (15), comme le montre les figure 2a, 2b et 7 solidaire en rotation du bras de levier (14), ledit organe étant destiné à recouvrir les parties du levier (2) qui, lors de son pivotement de sa position de serrage (B) à sa position inactive (A), se déplacent de l'extérieur (EX) de la chape (100) à l'intérieur (IN) de celle-ci. Ledit organe comporte, d'une part, une paroi supérieure (15a) de largeur L2 ajustée à la largeur L1 de la fente et dont la forme extérieure est circulaire de rayon R1, centrée sur l'axe (XX') et, d'autre part, deux joues latérales de protections (40a, 40b) prolongeant ladite paroi supérieure (15a) et dont les faces externes sont ainsi distantes de la largeur L2. Lesdites joues (40a, 40b) ont la forme d'un secteur de cercle centré sur l'axe (XX') de rayon R1. L'organe de protection est avantageusement réalisé selon l'usage effectué du dispositif (1) dans une matière destinée à permettre que les projections et autres salissures n'y adhèrent pas, comme, par exemple, en alliage d'aluminium lorsque l'on utilise le dispositif (1) pour effectuer une soudure sur des pièces en acier. Notons, de plus, qu'il est évidé dans sa partie arrière afin de ne pas gêner le mécanisme interne du dispositif lors du pivotement du levier de sa position active de serrage (B) vers sa position de libération (A).Said lever (2) comprises a lever arm (14) extending a embedding part (13) which constitutes its actuation and pivoting on which is pivotally mounted the connecting rod (16) of control and connection means (MC) as illustrated in FIGS. 3a, 3b, 3c and 7. In addition, the lever (2) advantageously comprises a member for protection (15), as shown in FIGS. 2a, 2b and 7 secured in rotation of the lever arm (14), said member being intended to cover the parts of the lever (2) which, when pivoted from its clamping position (B) in its inactive position (A), move from the outside (EX) of the yoke (100) inside (IN) thereof. Said organ comprises, part, an upper wall (15a) of width L2 adjusted to the width L1 of the slot and whose external shape is circular with radius R1, centered on the axis (XX ') and, on the other hand, two lateral protective cheeks (40a, 40b) extending said upper wall (15a) and the external faces of which are thus distant from the width L2. Said cheeks (40a, 40b) have the shape of a circle sector centered on the axis (XX ') of radius R1. The organ of protection is advantageously achieved according to the use made of the device (1) in a material intended to allow projections and other dirt does not adhere to it, such as, for example, aluminum alloy when using the device (1) to perform welding on steel parts. Note, moreover, that it is hollowed out in its rear part so not to interfere with the internal mechanism of the device when pivoting the lever from its active clamping position (B) to its release position (AT).

Selon le mode de réalisation préféré, la partie inférieure (9a) du corps (4) forme une chambre (17) fermée, à l'intérieur de laquelle est disposé le mécanisme proprement dit du dispositif de serrage (1). Elle est constituée de deux parois latérales (18a, 18b) prolongeant respectivement les deux parois latérales parallèles (10a, 10b) de la chape (100) ainsi que d'une paroi arrière (19) et une paroi avant (20), la paroi arrière s'étendant avantageusement jusqu'à la fente (11) de la chape (100).According to the preferred embodiment, the lower part (9a) of the body (4) forms a closed chamber (17), inside which is arranged the actual mechanism of the clamping device (1). She is consisting of two side walls (18a, 18b) extending respectively the two parallel side walls (10a, 10b) of the yoke (100) as well as a rear wall (19) and a front wall (20), the rear wall extending advantageously up to the slot (11) of the yoke (100).

Selon le mode de réalisation préféré, la partie inférieure (9a) du dispositif de serrage (1) est montée directement sur un vérin (7) pneumatique ou hydraulique d'axe longitudinal (ZZ') dont l'extrémité (8) de la tige de piston (6) est destinée à se déplacer sensiblement verticalement entre une position de détente (A1), illustrée figure 3a, correspondant à la position inactive (A) du levier (2) et une position dite de verrouillage (B1), illustrée figure 3c où le levier se trouve dans sa position active de serrage (B). Notons que comme dans tous les dispositifs de serrage utilisant le principe de la genouillère, entre les deux positions (A1, B1) de la tige de piston, celle-ci passe par une position intermédiaire de serrage (D1) non représentée, lors de laquelle le bras de levier (14) vient d'effectuer son pivotement pour se trouver dans sa position active de serrage (B), ledit levier restant dans sa position active (B) pendant que la tige de piston passe de ladite position intermédiaire de serrage (D1) à sa position de verrouillage (B1) et inversement. Notons que les positions (A1, B1 et D1) de l'extrémité de la tige de piston correspondent aux positions (A'1, B'1 et D'1) du galet d'extrémité sur les rampes de guidage inclinés décrits ultérieurement.According to the preferred embodiment, the lower part (9a) of the clamping device (1) is mounted directly on a cylinder (7) pneumatic or hydraulic with longitudinal axis (ZZ ') whose end (8) of the piston rod (6) is intended to move substantially vertically between a relaxed position (A1), illustrated in FIG. 3a, corresponding to the inactive position (A) of the lever (2) and a so-called position lock (B1), illustrated in Figure 3c where the lever is in its active clamping position (B). Note that as in all clamping devices using the toggle principle, in between positions (A1, B1) of the piston rod, it goes through a position clamping intermediate (D1) not shown, during which the lever (14) has just pivoted to be in its active clamping position (B), said lever remaining in its active position (B) while the piston rod passes from said intermediate position clamp (D1) to its locking position (B1) and vice versa. Note that the positions (A1, B1 and D1) of the end of the piston rod correspond to the positions (A'1, B'1 and D'1) of the end roller on the inclined guide rails described later.

Selon un mode de réalisation préféré, les moyens de commande et de liaison (MC) sont constitués par une pièce intermédiaire mobile en translation (21) portée par la tige de piston (6) du vérin (7) et solidaire en déplacement de l'extrémité (8) de ladite tige et par la biellette de liaison (16) montée pivotante à une de ses extrémités sur ladite pièce intermédiaire autour de l'axe principal de pivotement (22) et montée à l'autre de ses extrémités sur le bras de levier (14) ou la partie d'encastrement (13) du levier de serrage (2) autour d'un axe secondaire de pivotement (23), comme le montrent les figures 3a, 3b et 3c. Notons que la longueur de la biellette (L5), c'est-à-dire la distance entre les axes de pivotement principal et secondaire (22, 23) est avantageusement inférieure à la distance orthogonale (L6) entre l'axe de pivotement (XX', 3) du levier (2) et l'axe longitudinal (ZZ') de la tige de piston (6). Toutefois, il pourrait en être autrement, comme dans le deuxième mode de réalisation décrit ultérieurement. Ladite pièce intermédiaire a la forme générale d'un U constitué d'une paroi d'extrémité (21c) et de deux parois latérales verticales (21a, 21b) distantes d'une distance L3, comme le montre les figure 6 et 7. Lesdites parois latérales verticales portent transversalement à leurs extrémités supérieures (25a, 25b) l'axe principal de pivotement (22) sur lequel est monté la biellette de liaison (16). Ledit axe (22) est muni à chacune de ses extrémités d'un galet ou roulement d'extrémité (24a, 24b) destiné à être guidé dans son déplacement sensiblement vertical par les moyens de guidage (MG).According to a preferred embodiment, the control means and connecting (MC) are constituted by a movable intermediate piece in translation (21) carried by the piston rod (6) of the jack (7) and integral moving the end (8) of said rod and by the connecting rod link (16) pivotally mounted at one of its ends on said part intermediate around the main pivot axis (22) and mounted at the other of its ends on the lever arm (14) or the part mounting (13) of the clamping lever (2) around a secondary axis pivot (23), as shown in Figures 3a, 3b and 3c. Note as the length of the link (L5), i.e. the distance between the axes main and secondary pivoting (22, 23) is advantageously less than the orthogonal distance (L6) between the pivot axis (XX ', 3) of the lever (2) and the longitudinal axis (ZZ ') of the piston rod (6). However, it could be otherwise, as in the second mode of realization described later. Said intermediate piece has the form general of a U consisting of an end wall (21c) and two walls vertical lateral (21a, 21b) distant by a distance L3, like the shows Figures 6 and 7. Said vertical side walls bear transversely at their upper ends (25a, 25b) the main axis pivot (22) on which is mounted the connecting rod (16). Said axis (22) is provided at each of its ends with a roller or bearing end (24a, 24b) intended to be guided in its movement substantially vertical by the guide means (MG).

Notons que la biellette de liaison (16) est monté à une de ses extrémités entre les parois latérales verticales (21a, 21b) de la pièce intermédiaire (21) et à l'autre de ses extrémités dans une fente (26) située dans la partie d'encastrement (13) du levier (2). Il va de soi que le dispositif pourrait par exemple comporter deux biellettes de liaison parallèles disposées de part et d'autre de la pièce coulissante et de la partie d'encastrement du levier sans pour autant sortir du champ de protection de l'invention. De même, ladite biellette (16) et son axe (22) pourraient être montés directement sur l'extrémité de la tige de piston, par exemple.Note that the connecting rod (16) is mounted to one of its ends between the vertical side walls (21a, 21b) of the part intermediate (21) and at the other of its ends in a slot (26) located in the mounting part (13) of the lever (2). It goes without saying that the device could for example include two connecting rods parallels arranged on either side of the sliding part and the embedding part of the lever without leaving the field of protection of the invention. Similarly, said link (16) and its axis (22) could be mounted directly on the end of the piston rod, for example.

Selon ce mode de réalisation préféré de l'invention, les moyens de guidage (MG) destinés à guider l'axe principal de pivotement (22) sont constitués par deux lumières borgnes de guidage (30a, 30b) situées sur les faces internes (28a, 28b) des parois latérales (10a, 10b, 18a, 18b) du corps (4) du dispositif (1), comme le montrent les figures 4, 5 et 6. Lesdites lumières borgnes (30a, 30b) comportent chacune une rampe de guidage rectiligne verticale (50a, 50b) prolongée par une rampe de guidage inclinée (27a, 27b), lesdites rampes inclinées constituant les moyens de guidage inclinés (MI) des moyens de guidage (MG).According to this preferred embodiment of the invention, the means guide (MG) intended to guide the main pivot axis (22) are constituted by two blind guide lights (30a, 30b) located on the internal faces (28a, 28b) of the side walls (10a, 10b, 18a, 18b) of the body (4) of the device (1), as shown in Figures 4, 5 and 6. Said blind lights (30a, 30b) each have a guide ramp vertical straight (50a, 50b) extended by a guide ramp inclined (27a, 27b), said inclined ramps constituting the means of inclined guide (MI) of the guide means (MG).

Ainsi, l'axe principal de pivotement (22) et donc la pièce intermédiaire (21) et l'extrémité (8) de la tige de piston (6) qui lui sont solidaires sont entraínés dans une trajectoire rectiligne et verticale d'axe (ZZ'), d'une part, puis successivement dans une trajectoire inclinée par rapport audit axe (ZZ'), d'autre part, lorsque les galets d'extrémité (24a, 24b) dudit axe principal sont guidés dans les lumières (30a, 30b) successivement le long des rampes rectilignes verticales (50a, 50b) puis des rampes inclinées (27a, 27b) permettant ainsi à la tige de piston (6) de se mouvoir entre sa positions de détente (A1) et sa position de verrouillage (B1) illustrées respectivement figures 3a et 3c. Notons ainsi que lesdites positions (A1, B1) de l'extrémité de la tige de piston (8) correspondent respectivement à la position (A'1) des galets (24a, 24b) sur les rampes de guidage rectilignes (50a, 50b) et à la position (B'1) desdits galets sur les rampes inclinées (27a, 27b) illustrées figure 3'b et 3'c.Thus, the main pivot axis (22) and therefore the part intermediate (21) and the end (8) of the piston rod (6) which are there united are driven in a rectilinear and vertical axis trajectory (ZZ '), on the one hand, then successively in a trajectory inclined by ratio to said axis (ZZ '), on the other hand, when the end rollers (24a, 24b) of said main axis are guided in the lights (30a, 30b) successively along the vertical straight ramps (50a, 50b) then inclined ramps (27a, 27b) thus allowing the piston rod (6) to move between its relaxed positions (A1) and its position locking (B1) illustrated respectively in Figures 3a and 3c. So note that said positions (A1, B1) of the end of the piston rod (8) correspond respectively to the position (A'1) of the rollers (24a, 24b) on the straight guide rails (50a, 50b) and at the position (B'1) of said rollers on the inclined ramps (27a, 27b) illustrated in Figure 3'b and 3'c.

Selon le mode de réalisation préféré de l'invention, lesdites rampes (27a, 27b) sont constituées par des pièces indépendantes destinées à être positionnées et fixées dans des logements de rampe situés dans les faces internes (28a, 28b) des parois latérales (10a, 10b, 18a, 18b) du corps (4). Lesdites rampes sont positionnées de manière à ce qu'elles soient parcourues par les galets d'extrémité (24a, 24b) de l'axe principal de pivotement (22) entre une première position des galets dite position d'attaque (C'1), illustrée figure 3'b et une deuxième position des galets dite position de verrouillage (B'1) illustrée figure 3'c. Notons d'une part que la position (C'1) des galets correspond à une position (C1) de l'extrémité de la tige de piston (8) située entre sa position de détente (A1) et sa position intermédiaire de serrage (D1) ainsi qu'à une position intermédiaire (C) du levier tel qu'illustré figure 3b, et d'autre part que la position (B'1) des galets correspond à la position de verrouillage de la tige (B1) illustrée figure 3c. En outre, selon le mode de réalisation préféré, lesdites rampes sont positionnées dans l'espace situé au-dessus du plan horizontal (H1) contenant l'axe de rotation (3) du levier (2).According to the preferred embodiment of the invention, said ramps (27a, 27b) are made up of independent parts intended to be positioned and fixed in ramp housings located in the internal faces (28a, 28b) of the side walls (10a, 10b, 18a, 18b) of the body (4). Said ramps are positioned so that they are traversed by the end rollers (24a, 24b) of the axis main pivot (22) between a first position of the rollers called attack position (C'1), illustrated in FIG. 3'b and a second position of the rollers called locking position (B'1) illustrated in Figure 3'c. Let us note of a except that the position (C'1) of the rollers corresponds to a position (C1) of the end of the piston rod (8) located between its relaxed position (A1) and its intermediate clamping position (D1) as well as at a position intermediate (C) of the lever as illustrated in FIG. 3b, and on the other hand that the position (B'1) of the rollers corresponds to the locking position of the rod (B1) illustrated in Figure 3c. Furthermore, according to the preferred embodiment, said ramps are positioned in the space above the plane horizontal (H1) containing the axis of rotation (3) of the lever (2).

Notons, de plus, que les rampes (27a, 27b) sont inclinées avantageusement dans le plan médian (P) de manière à s'étendre vers le haut (HA) dans la direction du levier de serrage (2). Elles sont avantageusement incurvées soit sur l'ensemble de leur longueur comme le montre les figures 3'b et 3'c ou soit uniquement sur la portion où les galets passent de leur position d'attaque (C'1) à leur position intermédiaire de serrage (D'1) correspondant à la position intermédiaire (D1) de la tige, puis peuvent être droites entre les positions intermédiaires de serrage (D'1) et de verrouillage (B'1) des galets.Note, moreover, that the ramps (27a, 27b) are inclined advantageously in the median plane (P) so as to extend towards the high (HA) in the direction of the clamping lever (2). They are advantageously curved either over their entire length as the shows Figures 3'b and 3'c or either only on the portion where the rollers pass from their attack position (C'1) to their position clamping intermediate (D'1) corresponding to the intermediate position (D1) of the rod, then can be straight between positions clamping (D'1) and locking (B'1) intermediate rollers.

Lors du parcours des rampes inclinées (27a, 27b) par les galets (24a, 24b) de l'axe de pivotement (22) portant la biellette de liaison (16), l'axe longitudinal (RR') de ladite biellette forme un angle σ avec la droite (Q), ladite droite (Q) étant la droite perpendiculaire à la tangente (T) à la rampe inclinée au point M parcouru par le galet comme le montre la figure 9. Notons que les rampes inclinées (27a, 27b) sont incurvées de manière à ce que l'angle σ soit sensiblement constant lors dudit parcours des galets entre leur position d'attaque (C'1) et une position voisine de leur position intermédiaire de serrage (D'1).During the course of the inclined ramps (27a, 27b) by the rollers (24a, 24b) of the pivot axis (22) carrying the connecting rod (16), the longitudinal axis (RR ') of said link forms an angle σ with the straight line (Q), said line (Q) being the line perpendicular to the tangent (T) to the inclined ramp at point M traversed by the roller as shown in the figure 9. Note that the inclined ramps (27a, 27b) are curved so that the angle σ is substantially constant during said course rollers between their attack position (C'1) and a position close to their intermediate clamping position (D'1).

Ainsi, comme le montre les figures 3'b et 3'c les galets d'extrémités (24a, 24b) sont guidés dans les lumières (30a, 30b) selon l'axe longitudinal (ZZ') entre les positions de détente (A'1) et d'attaque (C'1) puis selon une trajectoire inclinée par rapport à l'axe (ZZ') entre la position d'attaque (C'1) et de verrouillage (B'1) en passant par la position intermédiaire de serrage (D'1). De ce fait, lorsque les galets passent de leurs positions (C'1) à leur position (B'1) en parcourant les rampes inclinées (27a, 27b) la distance orthogonale (d) entre l'axe principal de pivotement (22) qui les porte et l'axe longitudinal (ZZ') augmente comme le montre la figure 3'c, de ce fait la distance entre l'axe (ZZ') et l'extrémité de la tige de piston (8) qui passe de la position (C1) à la position (B1) augmente également.Thus, as shown in Figures 3'b and 3'c the rollers ends (24a, 24b) are guided in the lights (30a, 30b) according to the longitudinal axis (ZZ ') between the detent (A'1) and attack positions (C'1) then along an inclined path relative to the axis (ZZ ') between the attack (C'1) and locking (B'1) position via the intermediate clamping position (D'1). Therefore, when the rollers pass from their positions (C'1) to their position (B'1) by traversing the inclined ramps (27a, 27b) the orthogonal distance (d) between the axis main pivot (22) which carries them and the longitudinal axis (ZZ ') increases as shown in Figure 3'c, thus the distance between the axis (ZZ ') and the end of the piston rod (8) which passes from position (C1) to the position (B1) also increases.

Il va de soi que lesdites rampes pourraient être usinées directement à l'intérieur des lumières borgnes ; cependant, la courbure des rampes doit être usinée avec précision afin d'obtenir un angle σ sensiblement constant et donc d'obtenir l'effet escompté d'accroissement de l'effort transmis, il apparaít donc préférable de les réaliser séparément avant de les positionner et de les fixer dans des logements situés dans le prolongement des rampes rectilignes verticales des lumières borgnes. Notons que les pièces comportant lesdites rampes inclinées peuvent être avantageusement réalisée en acier.It goes without saying that said ramps could be machined directly inside the blind lights; however, the curvature ramps must be machined with precision in order to obtain an angle σ substantially constant and therefore to obtain the expected increase effect of the transmitted effort, it therefore seems preferable to carry them out separately before positioning and fixing them in housings located in the extension of the vertical straight ramps of the blind lights. Note that the parts comprising said inclined ramps can be advantageously made of steel.

Notons, par ailleurs, que les parois latérales verticales (21a, 21b) de la pièce intermédiaire (21) sont distantes d'une distance L3 supérieure à la largeur L2 de la paroi supérieure (15a) de l'organe de protection (15), de manière à ce que celle-ci puisse, lors de son pivotement vers la position inactive (A) du levier se loger dans l'espace (29) situé entre lesdites parois verticales. En outre, l'organe (15) de forme extérieure circulaire est évidé dans sa portion arrière afin de ne pas interférer avec l'axe principal de pivotement (22) dans la position inactive de libération (A) du levier de serrage (2).Note, moreover, that the vertical side walls (21a, 21b) of the intermediate piece (21) are spaced a distance L3 greater to the width L2 of the upper wall (15a) of the protection member (15), so that it can, when pivoted towards the inactive position (A) of the lever fit in the space (29) located between said vertical walls. In addition, the organ (15) of external shape circular is hollowed out in its rear portion so as not to interfere with the main pivot axis (22) in the inactive release position (A) of the clamping lever (2).

Selon le mode de réalisation préféré, le dispositif de serrage (1) comporte un système de détection (SD) pouvant être avantageusement de type inductif comportant au moins deux capteurs (41a, 41b) disposés à l'intérieur de la chambre (17) du corps (4) destinés à détecter la position dans laquelle se trouve le dispositif de serrage, c'est-à-dire le bras de levier (14) ou la tige de piston (6), en envoyant un signal à une unité de contrôle lorsque le dispositif de serrage est dans leur position de détection. Lesdits capteurs (41a, 41b), comme le montrent les figures 3a, 3b, 3c et 6, peuvent être disposés le long de la paroi avant (20) et contre une paroi latérale (18b) du corps (4) afin de pouvoir détecter la position d'un doigt de détection (42) solidaire de la pièce intermédiaire (21).According to the preferred embodiment, the clamping device (1) includes a detection system (SD) which can advantageously be inductive type comprising at least two sensors (41a, 41b) arranged at the interior of the chamber (17) of the body (4) intended to detect the position in which is located the clamping device, i.e. the arm of lever (14) or the piston rod (6), by sending a signal to a check when the clamping device is in their position detection. Said sensors (41a, 41b), as shown in FIGS. 3a, 3b, 3c and 6, can be arranged along the front wall (20) and against a side wall (18b) of the body (4) in order to be able to detect the position a detection finger (42) integral with the intermediate piece (21).

Il va de soi que l'on peut limiter l'amplitude du pivotement du bras de levier en ajoutant une bague de butée du dispositif autour de la tige de piston afin de modifier la longueur de la course de ladite tige.It goes without saying that one can limit the amplitude of the pivoting of the lever arm by adding a device stop ring around the piston rod in order to modify the length of the stroke of said rod.

De même, une variante consiste à modifier la forme du bras de levier pour lui donner une forme adaptée de manière à ce que le dispositif de serrage puisse effectuer le serrage d'une pièce à souder contre un plan vertical ou un plan incliné, par exemple. Similarly, a variant consists in modifying the shape of the arm of lever to give it a suitable shape so that the clamping device can clamp a piece to be welded against a vertical plane or an inclined plane, for example.

Par ailleurs, il est important de noter que les rampes inclinées (27a, 27b) sont réalisées de manière à obtenir un angle σ sensiblement constant, c'est-à-dire un angle σ dont les variations autour de sa valeur moyenne sont faibles, comprises entre 1 et 5° de débattement lorsque les galets d'extrémité (24a, 24b) parcourent lesdites rampes inclinées.Furthermore, it is important to note that the inclined ramps (27a, 27b) are produced so as to obtain an angle σ substantially constant, i.e. an angle σ whose variations around its value average are low, between 1 and 5 ° of travel when the end rollers (24a, 24b) run through said inclined ramps.

Selon un deuxième mode de réalisation illustré figures 10a à 11b où les pièces identiques ou équivalentes à celles du premier mode de réalisation portent la même référence, les rampes de guidage inclinées (27a, 27b) présentent une configuration différente de celle du premier mode de réalisation. En effet, contrairement au mode de réalisation précédent, les rampes de guidage (27a, 27b) ne sont plus inclinées vers le haut (HA) et vers l'avant (AV), mais possèdent une portion inférieure (51) inclinée vers le haut (HA) et vers l'arrière (AR) à l'opposé du levier (2), et une portion supérieure (52) qui est inclinée vers le haut (HA) et vers l'avant (AV).According to a second embodiment illustrated in FIGS. 10a to 11b where parts identical or equivalent to those of the first mode of the same reference, the inclined guide rails (27a, 27b) have a configuration different from that of the first embodiment. In fact, unlike the embodiment previous, the guide ramps (27a, 27b) are no longer inclined towards the high (HA) and forward (AV), but have a lower portion (51) tilted upwards (HA) and rearwards (AR) opposite the lever (2), and an upper portion (52) which is inclined upwards (HA) and forward (AV).

Selon ce deuxième mode de réalisation, la portion inférieure (51) prolonge les rampes rectilignes verticales (50a, 50b) et se dirige vers l'arrière par rapport à l'axe (ZZ'), tandis que la portion supérieure (52) se dirige ensuite vers l'avant et repasse à l'avant de l'axe (ZZ'). Notons que la courbure et l'inclinaison des portions supérieure (52) et inférieure (51) sont calculées de manière à ce que l'angle σ tel que précédemment défini reste sensiblement constant lorsque les galets (24a, 24b) parcourent lesdites portions.According to this second embodiment, the lower portion (51) extends the vertical straight ramps (50a, 50b) and goes towards the rear relative to the axis (ZZ '), while the upper portion (52) is then heads forward and goes back to the front of the axis (ZZ '). Note that the curvature and inclination of the upper (52) and lower (51) portions are calculated so that the angle σ as defined above remains substantially constant when the rollers (24a, 24b) travel said portions.

Notons que, selon ce mode de réalisation, la tige de piston (6) du vérin (7) subit un débattement angulaire d'avant (AV) en arrière (AR) de part et d'autre de l'axe (ZZ') contrairement au mode de réalisation précédent où la tige subissait un débattement angulaire dans une zone située uniquement à l'avant (AV) par rapport à l'axe (ZZ'). Il va de soi que la valeur globale du débattement angulaire d'avant en arrière occasionnée par le parcours des rampes inclinées par les galets est sensiblement identique dans les deux modes de réalisation. Cependant, ce deuxième mode de réalisation permet d'obtenir un débattement qui s'effectue autour de la position d'équilibre où la tige de piston est confondue avec l'axe longitudinal (ZZ') du vérin (7). Note that, according to this embodiment, the piston rod (6) of the cylinder (7) undergoes an angular movement from front (AV) to rear (AR) of on either side of the axis (ZZ ') unlike the embodiment previous where the rod underwent an angular movement in an area located only at the front (AV) relative to the axis (ZZ '). It's obvious that the overall value of the angular movement from front to back caused by the course of the ramps inclined by the pebbles is substantially identical in the two embodiments. However, this second embodiment makes it possible to obtain a clearance which takes place around the equilibrium position where the piston rod is coincident with the longitudinal axis (ZZ ') of the jack (7).

Selon ce deuxième mode de réalisation, la distance (L5) entre les axes principaux et secondaires (22, 23) portés par la biellette (16) est identique à la distance (L6) entre l'axe (XX') du levier (2) et l'axe longitudinal (ZZ') du vérin (7). Il va de soit que la distance (L5) pourrait être supérieure à ladite distance (L6), sans pour autant sortir du champ de protection de l'invention.According to this second embodiment, the distance (L5) between the main and secondary axes (22, 23) carried by the link (16) is identical to the distance (L6) between the axis (XX ') of the lever (2) and the axis longitudinal (ZZ ') of the cylinder (7). It goes without saying that the distance (L5) could be greater than said distance (L6), without however leaving the field of protection of the invention.

Par ailleurs, il est important de noter également que la pièce de liaison (21), la tige de piston (6) et le piston du vérin constituent un sous ensemble rigide qui porte les galets d'extrémités (24a, 24b) de l'axe principal (22) et dont l'inclinaison varie légèrement lorsque les galets parcourent les rampes inclinées.Furthermore, it is important to also note that the connection (21), the piston rod (6) and the piston of the jack constitute a sub rigid assembly which carries the end rollers (24a, 24b) of the axis main (22) and whose inclination varies slightly when the rollers roam the inclined ramps.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et représentés à titre d'exemples, mais elle comprend aussi tous les équivalents techniques ainsi que leurs combinaisons.Of course, the invention is not limited to the modes of realization described and represented as examples, but it includes also all technical equivalents and their combinations.

Claims (12)

Dispositif de serrage (1) destiné à retenir une pièce de construction à usiner ou à souder, du type comprenant un levier (2) monté pivotant autour d'un axe de rotation (XX', 3) par rapport à un corps de dispositif (4) pour être actionné en pivotement par le déplacement du piston d'un vérin (7) d'axe longitudinal (ZZ') entre une première position (A) dite position inactive de libération, et une deuxième position (B) dite position active de serrage, ledit levier (2) étant relié à l'extrémité (8) de la tige de piston (6) par l'intermédiaire de moyens de commande et de liaison (MC), ledit dispositif comportant des moyens de transmission de l'effort (MT) destinés à permettre l'obtention d'un effort de serrage du levier (2) important (EF1) sensiblement constant pendant que ledit levier pivote entre une position d'attaque (C) éloignée de la position de serrage (B) et une position voisine de la position de serrage (B) du levier, caractérisé en ce que les moyens de commande et de liaison (MC) comportent au moins une biellette de liaison (16) d'axe longitudinal (RR') montée pivotante, d'une part sur le levier de serrage (2) autour d'un axe secondaire de pivotement (23), et d'autre part soit sur un organe desdits moyens de commande et de liaison (MC) soit directement sur la tige de piston (6) autour d'un axe principal de pivotement (22), en ce que les moyens de transmission de l'effort (MT) sont constitués par des moyens de guidage (MG) destinés à guider l'axe principal de pivotement (22) dans une trajectoire au moins en partie inclinée par rapport à l'axe longitudinal (ZZ'), les moyens de guidage (MG) comprenant des moyens de guidage inclinés (MI) constitués par des rampes inclinées (27a, 27b) destinées à guider des galets d'extrémité (24a, 24b) disposés sur l'axe principal de pivotement (22) selon une trajectoire au moins en partie inclinée par rapport à l'axe longitudinal (ZZ') et en ce que les rampes inclinées (27a, 27b) sont incurvées de manière à ce que l'angle σ formé en un point M des rampes inclinées entre l'axe longitudinal (RR') de la biellette de liaison (16) et la droite (Q) perpendiculaire à la tangente (T) à la rampe inclinée au point M où se situe le galet (24a, 24b) soit sensiblement constant lorsque les galets d'extrémité (24a, 24b) parcourent lesdites rampes entre une position d'attaque (C1) et une position voisine d'une position intermédiaire de serrage (D'1).Clamping device (1) for retaining a workpiece construction to be machined or welded, of the type comprising a lever (2) mounted to pivot about an axis of rotation (XX ', 3) relative to a device body (4) to be pivotally actuated by the displacement of the piston of a cylinder (7) with a longitudinal axis (ZZ ') between a first position (A) called the inactive release position, and a second position (B) called active clamping position, said lever (2) being connected to the end (8) of the piston rod (6) by means of control and connection means (MC), said device comprising force transmission means (MT) intended to allow obtaining a significant clamping force on the lever (2) (EF1) substantially constant while said lever pivots between an attack position (C) away from the clamping position (B) and a position close to the clamping position (B) of the lever, characterized in that the means of control and link (MC) comprise at least one connecting rod connection (16) of longitudinal axis (RR ') pivotally mounted, on the one hand on the clamping lever (2) around a secondary pivot axis (23), and on the other hand either on a member of said control means and link (MC) either directly on the piston rod (6) around an axis main pivot (22), in that the means for transmitting the force (MT) consist of guide means (MG) intended to guiding the main pivot axis (22) in at least one trajectory partially inclined with respect to the longitudinal axis (ZZ '), the means of guide (MG) comprising inclined guide means (MI) constituted by inclined ramps (27a, 27b) intended to guide end rollers (24a, 24b) arranged on the main pivot axis (22) along a path at least partially inclined relative to the axis longitudinal (ZZ ') and in that the inclined ramps (27a, 27b) are curved so that the angle σ formed at a point M of the ramps inclined between the longitudinal axis (RR ') of the connecting rod (16) and the straight line (Q) perpendicular to the tangent (T) to the ramp inclined at the point M where the roller (24a, 24b) is located is substantially constant when the end rollers (24a, 24b) run through said ramps between a attack position (C1) and a position close to a position clamping intermediate (D'1). Dispositif de serrage (1) selon la revendication 1, caractérisé en ce que la distance (L5) entre l'axe de pivotement principal (22) et l'axe de pivotement secondaire (23) portés par la biellette de liaison (16) est inférieure à la distance orthogonale (L6) entre l'axe longitudinal du vérin (ZZ') et l'axe de rotation (XX', 3) du levier de serrage (2)Clamping device (1) according to claim 1, characterized in what the distance (L5) between the main pivot axis (22) and the axis secondary pivot (23) carried by the connecting rod (16) is less than the orthogonal distance (L6) between the longitudinal axis of the cylinder (ZZ ') and the axis of rotation (XX', 3) of the clamping lever (2) Dispositif de serrage (1) selon la revendication 1 ou 2, caractérisé en ce que les moyens de guidage (MG) sont constitués par des lumières borgnes de guidage (30a, 30b) situées sur les face internes (28a, 28b) des parois latérales (18a, 18b) du corps du dispositif (4), lesdites lumières comprenant des rampes rectilignes verticales (50a, 50b) prolongées par les rampes inclinées (27a, 27b).Clamping device (1) according to claim 1 or 2, characterized in that the guide means (MG) consist of blind guide lights (30a, 30b) located on the internal faces (28a, 28b) of the side walls (18a, 18b) of the body of the device (4), said lights including vertical straight ramps (50a, 50b) extended by inclined ramps (27a, 27b). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les rampes inclinées (27a, 27b) sont situées au dessus du plan horizontal (H1) qui contient l'axe de rotation (3) du levier (2).Clamping device (1) according to any one of previous claims, characterized in that the inclined ramps (27a, 27b) are located above the horizontal plane (H1) which contains the axis of rotation (3) of the lever (2). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les rampes inclinées (27a, 27b) sont au moins en partie incurvées.Clamping device (1) according to any one of previous claims, characterized in that the inclined ramps (27a, 27b) are at least partially curved. Dispositif de serrage (1) selon l'une quelconque des revendications précédentes. caractérisé en ce que les rampes inclinées (27a, 27b) sont inclinées vers le haut (HA) et vers le levier (2) par rapport à l'axe longitudinal (ZZ') dans un plan médian (P) de symétrie général du dispositif de serrage (1).Clamping device (1) according to any one of previous claims. characterized in that the inclined ramps (27a, 27b) are inclined upwards (HA) and towards the lever (2) relative to to the longitudinal axis (ZZ ') in a median plane (P) of general symmetry of the clamping device (1). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes. caractérisé en ce que la biellette de liaison (16) est montée pivotante à une de ses extrémités autour d'un axe principal de pivotement (22) sur une pièce intermédiaire mobile en translation (21) des moyens de commande et de liaison (MC), ladite pièce étant portée par l'extrémité (8) de la tige de piston (6) et à l'autre de ses extrémités autour d'un axe secondaire de pivotement (23) sur la partie d'encastrement (13) ou le bras (14) du levier de serrage (2).Clamping device (1) according to any one of previous claims. characterized in that the connecting rod (16) is pivotally mounted at one of its ends around an axis main pivot (22) on a movable intermediate piece translation (21) of the control and connection means (MC), said part being carried by the end (8) of the piston rod (6) and at the other of its ends around a secondary pivot axis (23) on the mounting part (13) or the arm (14) of the clamping lever (2). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un organe de protection (15) solidaire en rotation du levier (2) qui comporte une paroi supérieure (15 a) de forme circulaire et deux joues latérales (40a, 40b).Clamping device (1) according to any one of previous claims, characterized in that it comprises a member protection (15) integral in rotation with the lever (2) which comprises a upper wall (15a) of circular shape and two lateral cheeks (40a, 40b). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un système de détection (SD).Clamping device (1) according to any one of previous claims, characterized in that it comprises a system detection (SD). Dispositif de serrage (1) selon les revendications 1, 3, 4 et 5, caractérisé en ce que les rampes inclinées (27a, 27b) comportent chacune une portion inférieure (51) orientée vers le haut (HA) et vers l'arrière (AR) et une portion supérieure (52) orientée vers le haut (HA) et vers l'avant (AV) par rapport à l'axe longitudinal (ZZ') du vérin (7).Clamping device (1) according to claims 1, 3, 4 and 5, characterized in that the inclined ramps (27a, 27b) each have a lower portion (51) oriented upward (HA) and rearward (AR) and an upper portion (52) oriented upwards (HA) and towards the front (AV) relative to the longitudinal axis (ZZ ') of the jack (7). Dispositif de serrage (1) selon la revendication 10, caractérisé en ce la distance (L5) entre l'axe de pivotement principal (22) et l'axe de pivotement secondaire (23) est supérieure ou égale à la distance orthogonale (L6) entre l'axe longitudinal (ZZ') du vérin et l'axe de rotation (XX', 3) du levier de serrage (2).Clamping device (1) according to claim 10, characterized in this the distance (L5) between the main pivot axis (22) and the axis of secondary pivot (23) is greater than or equal to the distance orthogonal (L6) between the longitudinal axis (ZZ ') of the jack and the axis of rotation (XX ', 3) of the clamping lever (2). Dispositif de serrage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce la tige de piston (6) subit un débattement angulaire d'avant (AV) en arrière (AR) et inversement lorsque les galets (24a, 24b) parcourent les rampes inclinées (27a, 27b).Clamping device (1) according to any one of previous claims, characterized in that the piston rod (6) undergoes angular movement from front (AV) to rear (AR) and vice versa when the rollers (24a, 24b) run through the inclined ramps (27a, 27b).
EP97410114A 1996-10-15 1997-10-14 Clamping device of the kind comprising a piston actuated lever Withdrawn EP0836912A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9612866A FR2754484B1 (en) 1996-10-15 1996-10-15 IMPROVEMENT FOR A TIGHTENING DEVICE OF THE TYPE INCLUDING A PISTON-OPERATED LEVER
FR9612866 1996-10-15

Publications (1)

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EP0836912A1 true EP0836912A1 (en) 1998-04-22

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EP97410114A Withdrawn EP0836912A1 (en) 1996-10-15 1997-10-14 Clamping device of the kind comprising a piston actuated lever

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EP (1) EP0836912A1 (en)
FR (1) FR2754484B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894573A2 (en) * 1997-07-29 1999-02-03 Benteler Ag Workpiece clamp
EP1262444A1 (en) * 2001-05-31 2002-12-04 Still & Saxby S.à.r.l. Finger guard for an industrial truck guided by a drawbar
EP2177320A1 (en) 2008-10-15 2010-04-21 UNIVER S.p.A. Irreversible-type toggle-lever drive device
DE102017104868A1 (en) 2017-03-08 2018-09-13 Karin Schmid E. K. Swing clamps for automation purposes

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FR2550115A1 (en) * 1983-08-03 1985-02-08 Thombor Rojac Clamping device
EP0216710A1 (en) * 1985-09-24 1987-04-01 Fabrice Goussu Multiple-head clamping device with a single remote control
US4679782A (en) * 1985-01-02 1987-07-14 Aladdin Engineering & Mfg Mechanical toggle clamp with means for applying uniform clamping force
EP0341155A1 (en) * 1988-05-06 1989-11-08 Genus International Device for clamping plates or sectional steels against each other
EP0436883A1 (en) * 1990-01-09 1991-07-17 DE-STA-CO Metallerzeugnisse GmbH Clamping device
FR2677570A1 (en) * 1991-06-13 1992-12-18 Badart Jacques Device for clamping a body with respect to a reference frame
FR2696120A1 (en) * 1992-09-25 1994-04-01 Badart Jacques Articulated clamp for robotics - includes crank, with device to fix this crank rotatively around rotation axis, and arm for controlling crank rotation and guide surface for guiding roller
EP0615817A1 (en) * 1993-03-16 1994-09-21 Génus Technologie Industrielle (G.T.I.), S.A. Clamping device, especially for clamping metal sheets or profiles against each other

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550115A1 (en) * 1983-08-03 1985-02-08 Thombor Rojac Clamping device
US4679782A (en) * 1985-01-02 1987-07-14 Aladdin Engineering & Mfg Mechanical toggle clamp with means for applying uniform clamping force
EP0216710A1 (en) * 1985-09-24 1987-04-01 Fabrice Goussu Multiple-head clamping device with a single remote control
EP0341155A1 (en) * 1988-05-06 1989-11-08 Genus International Device for clamping plates or sectional steels against each other
EP0436883A1 (en) * 1990-01-09 1991-07-17 DE-STA-CO Metallerzeugnisse GmbH Clamping device
FR2677570A1 (en) * 1991-06-13 1992-12-18 Badart Jacques Device for clamping a body with respect to a reference frame
FR2696120A1 (en) * 1992-09-25 1994-04-01 Badart Jacques Articulated clamp for robotics - includes crank, with device to fix this crank rotatively around rotation axis, and arm for controlling crank rotation and guide surface for guiding roller
EP0615817A1 (en) * 1993-03-16 1994-09-21 Génus Technologie Industrielle (G.T.I.), S.A. Clamping device, especially for clamping metal sheets or profiles against each other

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894573A2 (en) * 1997-07-29 1999-02-03 Benteler Ag Workpiece clamp
EP0894573A3 (en) * 1997-07-29 1999-04-28 Benteler Ag Workpiece clamp
EP1262444A1 (en) * 2001-05-31 2002-12-04 Still & Saxby S.à.r.l. Finger guard for an industrial truck guided by a drawbar
EP2177320A1 (en) 2008-10-15 2010-04-21 UNIVER S.p.A. Irreversible-type toggle-lever drive device
DE102017104868A1 (en) 2017-03-08 2018-09-13 Karin Schmid E. K. Swing clamps for automation purposes

Also Published As

Publication number Publication date
FR2754484A1 (en) 1998-04-17
FR2754484B1 (en) 1999-04-16

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