EP0849046A1 - Actuating mechanism - Google Patents

Abstract

A second rotatably located positioning member (3) is articulately connected with the intermediate member (2) for the application of a tension arm (4), which is formed by two circular discs (3') enclosing a gap. The two circular discs are firmly but releasably connected to one another by a central shaft piece (6) penetrating the gap and a second shaft piece eccentrically arranged to the first. The peripheral surfaces of the two circular discs (3'), when viewed in cross-section, are formed as a step towards the side of the gap. The first shaft piece (6) is reduced in diameter and on it a ring (6') is arranged, the outer diameter of which corresponds to the width (B) of the slot (8) in an extension (9) open to the first shaft piece (6).

Description

The invention relates to an actuating gear for installation in head pieces or housings of toggle clamps, consisting of a first, linearly guided, by a drive actuatable actuator, an articulated thereon Intermediate link, a second rotatably mounted, actuator connected to the intermediate member for the attachment of a tension arm, which consists of two one Gap enclosing circular disks is formed that through a central, penetrating first gap Shaft piece and a second eccentrically arranged Shaft piece are firmly but releasably connected.

Apart from the fact that such a transmission structure for Toggle clamps are very general such actuating gears, however, in connection with a specially adapted housing, for example US-A-5171001, known, because also in their clamping device two actuators coupled by an intermediate element are present, one linear and the other rotating is adjustable. As with all other toggle clamps also, with this jig, the maximum loads occurring at the clamping position via Link and linear actuator from the gearbox or transfer the gearbox out to the housing. On the one hand, this fact regarding the Housing dimensions are always taken into account on the other hand, very often on the part of the users such fixtures special shapes Housing or head pieces required, so that in such cases design adjustments are always required, which, as I said, always meet the usual load requirements have to suffice. What the aforementioned As a rule, this affects special shapes to the fact that the manufacturer of such jigs despite existing extensive range of offers again and again Made to order, for example instead serial connection types modified or because other query systems (for Closing and opening) are required, etc., what in the Rule also leads to interventions in or changes made on standard parts of the actuating gear Need to become. With the aforementioned clamping device according to US-A-5 171 001, any changes or Adjustment requests even less taken into account because the head piece and drive even become one housing are summarized, the linear actuator is mandatory must support an inner housing flank and also the clamping arm can only be arranged on the outside, i.e. the entire actuating gear of this tensioning device provides a mandatory match to the housing Construction.

According to FR-A-2 588 494 there is still an actuating gear known in the headpiece and drive are separable, but also with this actuating gear the entire load is in the tensioned position transferred to the housing, although for the Support of the linear actuator in the upper housing area a special abutment (roller bearing) is arranged.

Furthermore, in DE-A-42 36 670 A1 a toggle lever tensioning device with actuating gear described that from at least one also from a linear actuator driven rotatable actuator, wherein the movement kinematically through a guide is defined. Also with this actuating gear the load essentially directly over the axis of rotation of the actuator to the device. The Circular disks mentioned in the introduction are not available.

Finally, according to DE-A-196 04 976 A1 is a tensioning device known that sealed against pollution and in which the second actuator also as a circular disc is trained. As with all of the above Devices are also here from the tension arm outgoing load on the rear Transfer linear actuator supporting the housing wall.

The object of the invention is based on an actuating gear of the type mentioned in the introduction, to improve this in that the tension forces occurring essentially from the transmission itself recorded, i.e., differentially distributed and thus passed on reduced to the housing or head piece are seen so that from the load side. the housing design gives greater freedom, one but always on the same actuation gear can fall back.

This task is with an actuating gear initially mentioned type according to the invention by the in Features mentioned claim solved. Beneficial further refinements result from the subclaims.

Under the term "gap" used in claim 1 is not a space between the panes to understand from just a millimeter width or even a gap, how it would result if the two circular disks lie directly next to each other, but the gap width is dimensioned so that at least the essential here Extension of the linear actuator between the circular disks can intervene, who in turn is in strength at the Orient the load to be absorbed during the clamping process is. The extension takes over the whole via the clamping arm and intermediate element in the linear actuator Tension load and is based on the first, central shaft section, i.e. the load remains in a way in the transmission and is differentially on the Circumference of the circular disks distributed over the head piece or Broadcast case, however this, apart from the Bearing openings for the two circular disks, otherwise designed may be.

Such a "circular disc bearing" in the housing has also the tensioning device according to the aforementioned US-A-5 171 001, but this is the rotating actuator for the tension arm Circular discs, but around a cylindrical rotating body with engagement groove for the pontic and that Linear actuator which, like with tensioners common, with an attached slider in Housing is guided and supported. Apart from that, can the clamping arm is only attached to the outside of the rotating body will. In contrast to this and thanks to the clamping load absorption by extension and central first shaft piece needs the actuating gear according to the invention no such back support.

Since the rotatably mounted second actuator consists of two Circular disks are formed, the tension arm does not have to necessarily placed on the outside of one of the circular disks be, but there is also the possibility of what else is explained in more detail, the clamping arm between the circular discs to be arranged, i.e. the clamping arm would then be centric protrude from the gearbox.

A solution deviating from the solution described above arises according to independent claim 9.

The actuating gear according to the invention and its advantageous Further training is based on the graphic representation of exemplary embodiments explained.

Fig. 1

in Seitenansicht das Betätigungsgetriebe;

Fig. 2

in Seitenansicht das linear geführte Stellglied (nur Fortsatz ohne Stellstange);

Fig. 3

das Stellglied gesehen in Pfeilrichtung P gemäß Fig.2;

Fig. 4, 5

schematisch und vereinfacht teilweise im Schnitt und in Draufsicht Ausführungsformen des Betätigungsgetriebes;

Fig. 6

in Seitenansicht das Betätigungsgetriebe gemäß Fig. 1, eingebaut in einem Kopfstück;

Fig. 6 A, B

schematisch in Seiten- und Vorderansicht eine "abgemagerte" Ausführungsform eines Kopfstückes;

Fig. 7

perspektivisch und vergrößert das linear geführte Stellglied in besonderer Ausführungsform;

Fig. 8

eine unabhängige Lösung der Vorrichtung in Seitenansicht;

Fig. 9

einen der beiden Ringe in Innenansicht;

Fig. 10

die Vorrichtung nach Fig. 8 in rückseitiger Ansicht und

Fig. 11

eine der beiden Kreisscheiben in Innenansicht.

It shows

Fig. 1

in side view the actuating gear;

Fig. 2

side view of the linear actuator (only extension without actuator rod);

Fig. 3

the actuator seen in the direction of arrow P according to Figure 2;

4, 5

schematically and simplified partially in section and in plan view embodiments of the actuating gear;

Fig. 6

in side view of the actuating gear according to Figure 1, installed in a head piece.

Fig. 6 A, B

schematically in side and front view of a "lean" embodiment of a head piece;

Fig. 7

perspective and enlarged the linearly guided actuator in a special embodiment;

Fig. 8

an independent solution of the device in side view;

Fig. 9

one of the two rings in an interior view;

Fig. 10

8 in the rear view and

Fig. 11

one of the two circular disks in an interior view.

The actuating gear for installation in head pieces from Toggle clamps exist, with reference to Fig. 1 to 4, as before and basically from one first, linearly guided, operable by a drive A. Actuator 1, an intermediate element 2 articulated thereon, a second rotatably mounted, with the intermediate member 2nd articulated actuator 3 for attaching a Clamping arm 4, which includes a gap 5 from two Circular disks 3 'is formed by a Central, first shaft piece passing through the gap 5 6 and an eccentrically arranged second shaft piece 7 are firmly but releasably connected to one another, an extension 9 with which in the gap 5 next to the engaging first shaft piece 6 and by Intermediate member 2 connected to the second shaft piece 7 Actuator 1 is provided, and one in the extension 9 provided slot open towards the first shaft piece 6 8, whose width B is the diameter D of the first Corresponds to shaft piece 6 and its longitudinal center line 10 intersects the axis 6 'of the first shaft piece 6, wherein the extension 9 with its inner flank 9 'in the clamping position abuts the shaft piece 6.

1 and 7 show the dead center or Dead center position of the gearbox, i.e. at to be determined Workpiece arm 4. When opening of the tension arm 4 in the direction of the arrow P '(see Fig. 1) moves by a cross bolt 2 '' Deflection axis 2 'straight down and the second Shaft piece 7, for example, when swiveling back through 90 ° on one Quarter-circle arc in a clockwise direction.

Both for drive A (see Fig. 6) and for Actuator 1 belonging to actuator 1 does not necessarily have to as shown, with its axis that of the central first Cut shaft piece 6, but can also be arranged be that their axis with the line of motion G of the Cross bolt 2 '' coincides.

However, the embodiment shown in this regard is preferred, because it concentrates the whole gear Drive A (e.g. pneumatic cylinder) is assigned and the Parts far from the clamping arm, i.e. the one to the right of the first Part of the actuator 3 located on the shaft piece 6 for still advantageous further developments to be explained remains free.

In contrast to all previous and as far as known tensioning devices of this type, the load in the actual tensioning process, as described in the introduction, is now no longer on the right-hand side (based on the illustrations) of the actuator 1, but rather through the inner flank 9 'of the extension 9 on the actuator 1, which attaches itself to the first shaft piece 6, which is connected in a suitable and easy to install fixed but detachable manner to the two circular disks 3 '(see FIG. 4), which distribute the load to the head piece K differentially over the entire circumference of which an embodiment is shown in Fig. 7.
In an extreme case, the head piece K could be reduced to a shape which was "emaciated" in FIGS. 6 A, B, without having to change anything on the actuating gear, only a through opening 16 for the actuator 1 would have to be provided in the flange part AT.

Except for a change in length of the two with the Circular disks 3 'firmly connected shaft pieces 6, 7 can the transmission also has training in that this the tension arm 4, as schematically in FIG. 5 shown, is assigned in the middle, with the disc side End of the tension arm 4 'bswp. fork-like is formed and the legs 4 'the shaft piece 6 reach around. From the outer flanks of the circular disks 3 ' are then the legs 4 'with these firmly by screws connected.

As can also be seen from FIGS. 4, 5, the Circumferential surfaces of the two circular disks 3 'in cross section seen, towards the gap side in the form of a step 3 '' educated. As a result, the two circular disks 3 ' axially secured, and this also results in a easy installation on the appropriate insert or bearing openings 17 headpiece K for the circular disks 3 '.

With regard to the load on the shaft piece 6 by the extension 9, which is not mandatory, as in Fig. 1, 3 shown, so its length must be measured - it is only essential that this is still in the clamping position Shaft piece 6 rests - is the first shaft piece 6 in Reduced diameter and on this, but fits well still rotatable, a ring 6 '' arranged, the Outer diameter substantially the width B of the Slot 8 corresponds. This creates a permanent load always in the same place of the Shaft piece 6 avoided, apart from the fact that the ring can be easily replaced when worn.

Another advantageous training consists of the following: The distance H of the articulation axis 2 'of the intermediate member 2 is on the actuator 1 to the lower edge 1 '' of the extension 9 larger dimensioned as the maximum stroke of actuator 1, i.e. the total height of the actuator is not insignificant larger than usual attachments on adjusting rods Linking the pontic 2. Such a design offers advantageous further training opportunities than on the one hand in the lower (drive side) area of the first actuator 1 in one side flank lower (drive side) surface of the actuator 1 down open adjusting groove 13 can be arranged and as for others comfortably in the back (pontic side), load-free part 1 '' 'of actuator 1 Closed position cam 14 adjustable and in one parallel also groove-shaped recess 15 ' adjustable opening angle stop 15 can be arranged can (see Fig. 6 but also Fig. 7).

With an appropriate design of the head piece K can thereby, if required, and as in FIG. 6 shown in the headpiece K to be operated by hand Lever 18 installed and pivoted, the with an adjusting cam 18 'engages in the adjusting groove 13 and the with a lever that can be plugged onto an outer square 18 '' can be actuated. Such a lever 18 then takes over Function of drive A.

As for the closed position cam 14 and the opening angle stop 15 relates to, as can be seen from Fig. 7 on the rear part 1 '' 'of the actuator 1 in one groove-shaped recess 15 'are arranged, which is possible has become because this part no longer has any support points to the Headpiece K has to take over, is these two Elements on the headpiece K, a suitable sensor 19 (e.g. Microswitch with two switching cams) for the end position display assigned.

With regard to a further independent solution, see FIG. 8 to 11, in which reference numerals from 101 are used. In this independent embodiment the actuating gear consists of a first, linear guided actuator which can be actuated by a drive A. 101, an articulated link 102, a second rotatably mounted, with the intermediate member 102nd articulated actuator 103 for attachment a clamping arm, which consists of two a gap 105 enclosing circular discs 103 'is formed by two vis-a-vis eccentrically arranged, the gap 105 penetrating shaft pieces 106, 107 firmly together are releasably connected, the one shaft piece 106 the Articulation axis for the intermediate member 102 forms and where furthermore the two circular disks 103 'in FIG the same gap distance arranged, coaxial to each other fixable rings 108 are guided, the gap side parallel to the straight line of extension and movement of the Actuator 101 has a guide groove 109 with a clamping force abutment flank 110.

This embodiment is also in itself closed actuating gear, which in itself via Circular disks the clamping load on the rings 108 or whose clamping force abutment flanks 110 and that as self-contained system in head pieces or housings can be installed that is only circular Must have openings for receiving the rings 108. It is even possible to use the entire gearbox, for example to be arranged on one side of a support. That in the embodiment Intermediate member 102 shown in FIG. 10 consists of two tabs 102 'through a shaft piece 106 'are articulated at the end of the actuator 101.

The tension load transfer to the two abutment flanks 110 of the rings 108 takes place, for example, through the outside next to the tabs 102 'placed on the shaft piece 106' Ball bearing 111.

Claims (9)

Actuator for installation in head pieces or housings of toggle clamps, consisting of a first, linearly guided actuator (1) which can be actuated by a drive (A), an intermediate link articulated thereon (2), a second rotatably mounted actuator (3) articulated to the intermediate member (2) for the attachment of a tension arm (4), which is formed from two circular disks (3 ') enclosing a gap (5), which is formed by a central gap (5) penetrating first shaft piece (6) and an eccentrically arranged second shaft piece (7) are firmly but releasably connected to each other, an extension (9) with which the actuator (1) engaging in the gap (5) next to the first shaft piece (6) and connected to the second shaft piece (7) by the intermediate member (2) is provided, and a slot (8) provided in the extension (9) towards the first shaft piece (6), the width (B) of which corresponds to the diameter (D) of the first shaft piece (6) and the longitudinal center line (10) of the axis (6 ') of the first shaft piece (6) cuts, the extension (9) with its inner flank (9 ') in the clamping position against the shaft piece (6). Actuating gear according to claim 1,
characterized,
that the peripheral surfaces of the two circular disks (3 '), seen in cross section, are formed towards the gap side in the form of a step (3''). Actuating gear according to claim 1 or 2,
characterized,
that the first shaft piece (6) is reduced in diameter and a ring (6 ') is arranged thereon, the outer diameter of which essentially corresponds to the width (B) of the slot (8). Actuating gear according to one of claims 1 to 3,
characterized,
that the distance (H) of the articulation axis (2 ') of the intermediate member (2) on the actuator (1) to the lower edge (1'') of the extension (9) is larger than the maximum stroke of the actuator (1). Actuating gear according to one of claims 1 to 4,
characterized,
that a connection recess (11) for an actuating rod (12) is arranged on the underside (1 '') of the extension (9) centrally to the longitudinal center line (10) of the slot (8). Actuating gear according to one of claims 1 to 5,
characterized,
that in the lower region of the extension (9) in one side flank there is an adjusting groove (13) open towards the lower surface of the extension (9). Actuating gear according to one of claims 1 to 6,
characterized,
that a closed position cam (14) is adjustable in the rear part of the actuator (1) and an adjustable opening angle stop (15) is arranged in a parallel recess. Actuating gear according to one of claims 1 to 7,
characterized,
that the end of the tensioning arm (4) on the circular disc engages in the gap (5) between the circular discs (3 '), engages around the shaft piece (6) and is firmly connected to at least one of the circular discs (3'). Actuator for installation in head pieces or housings of toggle clamps, consisting of a first, linearly guided actuator (101) which can be actuated by a drive (A), an intermediate link (102) articulated thereon, a second rotatably mounted actuator (103) articulated to the intermediate member (102) for the attachment of a tension arm, which is formed from two circular disks (103 ') enclosing a gap (105), which are arranged eccentrically by two vis-a-vis , shaft sections (106, 107) passing through the gap (105) are firmly but releasably connected to one another, the shaft section (106) forming the articulation axis for the intermediate member (102) and the two circular disks (103 ') also being at the same gap distance Arranged, coaxially fixable rings (108) are guided, which have a guide groove (109) with clamping force abutment flank (110) parallel to the straight line of extension and movement of the actuator (101).

Images