EP1642681A2 - Clamping fixture - Google Patents

Abstract

Clamp (1) comprises a base part (2) having a manual incremental drive (20). An independent claim is also included for an incremental drive for the above clamp. Preferred Features: The drive has a tensioning lever (21) which moves to and fro and is arranged on a clamping part (3). The clamping part slides with its connecting rod (4) in the base part. The operating element of the drive is arranged on the base part so that it can be operated by the same hand of the user which holds the base part.

Description

I. Field of application

The invention relates to a clamping clamp and a stepper drive, as it can be used to drive such a clamping clamp.

II. Technical background

By means of a clamp clamp two workpieces are pressed in the wood and metal processing relative to each other, usually pressed against each other, which is usually used as a prefix for a later final fixation by screws, welding or the like.

For this purpose, the clamping clamp consists of two relatively movable parts, namely a base part and guided therein or mounted clamping part which can be pressed under application of a clamping force against the base part or pressed away from them.

III. Presentation of the invention

The usual design of a clamping clamp is a screw clamp, in which after the loose juxtaposition of the clamping part and the base part - with the workpieces to be compressed therebetween - by means of a threaded spindle which extends through the base, for example, the desired clamping force is applied. Instead of a threaded spindle and toggle and other mechanisms are known.

• zum einen die beiden Werkstücke sowohl relativ zueinander als auch relativ zur Klemmzwinge richtig positioniert werden müssen,
• die Klemmzwinge an die Werkstücke angelegt und
• anschließend unter Aufbringung der Klemmkraft verklemmt werden muss, wofür über alle drei Arbeitsschritte insgesamt nur die zwei Hände des Benutzers meist nicht ausreichen.

The disadvantage here is that a prefixing of two components against each other by means of such a clamp clamp by an operator alone is often not possible because

• on the one hand, the two workpieces must be positioned correctly both relative to one another and relative to the clamping clamp,
• the clamp clamp applied to the workpieces and
• must then be jammed under application of the clamping force, for which over all three steps in total only the two hands of the user usually not sufficient.

Under a stepper drive for the purposes of the present application, each drive understood that causes a stepwise forward movement of the relatively moving parts and / or in which the manually operated drive element is moved stepwise, so for example. Back and forth, back and forth etc., where only one stroke is a working stroke and the other stroke is the return stroke.

With respect to the stepper drive, as it can be used in particular for such a design of the clamping clamp, it is known that a conventional stepper drive can be operated by means of a clamping lever with only one hand.

It must be available for the release of the stepper drive at least a second switching position.

a) Technical task

With respect to the clamp clamp, the object of the invention is therefore to be able to accomplish both the positioning and the application of a high, in particular automatically adjusting clamping force, the loosening and opening of the clamp with only one hand of the operator, so that the other hand for Hold and free to position the two workpieces.

With regard to the stepper drive, therefore, the object of the invention is to form the stepper drive so that all functions can be performed by only one hand of the operator and in particular the direction of action of the stepper should still be reversible.

b) Solution of the task

This object is solved by the features of claims 1, 12 and 29. Advantageous embodiments will be apparent from the dependent claims.

The arrangement of a stepper drive with a reciprocable clamping lever on the clamping part, the operation of the clamp is initially possible in one direction, the clamping direction, by means of the holding hand of the user himself.

Due to the formation of clamping part and base part with transversely projecting extensions as in conventional clamping clamps no change in the use of clamping clamps is necessary for the user, since the relative movement is the same as in conventional clamping clamps, namely the longitudinal displacement of the push rod in the base part.

Alternatively, the clamping member may also be pivotable relative to the base part, so undergo a circular movement or a different type of arcuate movement.

By the base part having a handle-like shaped part, and the clamping lever is arranged there, the simultaneous holding and pressing the clamping clamp with one hand of the user is possible.

By operating the switch, the direction of movement of the clamping member can be adjusted in the opposite direction, which means for the same clamping operation that is switched from terminals to release, or it can also be changed for a new clamping operation, the clamping direction, e.g. from pressing against each other on pressing apart.

For this purpose, moreover, the base part completely withdrawn from the push rod of the clamping member and rotated by 180 °, so again postponed, thereby also the clamping direction is changed by the clamping extension of the clamping member now instead of the upper end of the lower end protrudes the base part.

By arranging the switch on the base part in the grip area of the user's hand, in particular the user's thumb, this switch can again be performed by the same hand of the user and during the clamping process that no second hand is needed, thus for holding the workpiece or the workpieces is available.

By the switch next to the two end positions, which correspond to the two directions of movement, occupy a central position, this center position can be used for the fact that the clamping member relative to the base member in both directions of movement is freely displaced.

By arranging a clamping insert in the corresponding extensions of the base part or clamping part, such a clamping insert also in his Transverse distance can be varied by the push rod by being used in different spaced receiving positions, whereby the transverse distance of the clamping point can be influenced.

The clamping force applied by the stepper drive can be further increased if the clamping insert additionally contains a threaded spindle which can be actuated by means of a spindle lever, the force increase being dependent on the length of the spindle lever and the thread pitch - the clamping force applied by the stepper drive is further increased by means of the threaded spindle ,

In this case, the step drive to be used, in particular in the clamping clamp, has special features which make these functions possible:

Thus, the direction of action of the stepper drive can be adjusted by the fact that the pivoting direction of the push arm from the starting position to the operating state in the clockwise or counterclockwise direction, and in particular for this purpose, the push arm, when it assumes the starting position, be displaced, be shifted in particular in the longitudinal direction, so that its operating end with a different area than before, that is, with another active surface of the clamping lever, in contact.

Preferably, in this conversion, the push arm, which is preferably in its deactivated position, is displaced and pivoted relative to the push rod in the longitudinal direction and pivoted, from a positive angle relative to the transverse direction to a negative angle and vice versa.

Due to the displaceability of the support end of the push arm, this can be done very easily, especially with the help of the switch to which an operative connection, for example by means of a spring, in particular a combined tension spring which springs both in the pressure direction and in the tension direction, thus for both Effective directions near the support end and therefore biasing the arm pushes into the starting position.

Also, the support arm is biased by a Stützarmfeder in the starting position.

Also, the clamping lever itself is biased by means of a clamping lever spring in its initial position, in which he goes back to release to relocate by re-actuation the push arm.

• bei aktiver Positionierung des Umschalters in einer der beiden Endstellungen (Über-Totpunkt-Positionen) in der gewählten Funktionsstellung verbleibt, und
• ohne aktive Positionierung der Umschalter die neutrale Mittelstellung anfährt, in der die Schubstange in beide Richtungen frei verschiebbar ist.

By taking one of two over-dead-center positions of the push arm, in particular its operating end, with respect to the clamping lever ensures that

• remains active in the selected functional position with active positioning of the switch in one of the two end positions (over-dead-center positions), and
• without active positioning of the switch the neutral center position anfährt, in which the push rod is freely displaced in both directions.

Due to the different contouring of the active edges on the clamping lever for the two functional positions of the push arm, both the force curve and the absolute force height, which are applied during actuation of the clamping lever of the cutting drive, can be specified differently.

By changing the course of the effective active edges or the change between several existing active edges, in particular automatically and in particular during operation of the stepper drive, a change in the ratio of the stepper is effected. In the clamping clamp with increasing pressure build-up at the clamping point a change in the translation in the direction of higher maximum force by lower feed path per clamping lever movement is possible.

Due to the pivotability of the support arm relative to the transverse direction from one to the other inclined position and the support arm is adjustable according to the two directions of action.

By the support arm is also converted from the switch by means of a preferably mechanical connection, in particular a combined tension spring, can be converted by means of a single switch the entire stepper drive in its direction of action at a time.

By the bearing of the clamping lever to a bearing pin whose position is not fixed, but is movable, and which is in particular in a pivotable bearing arm, the action of the spring which biases the support arm can be supported by the bearing pin in the pivotable bearing arm with respect to the pivot point the bearing arm is arranged so that the pressure exerted by the clamping lever - when actuated - on the bearing arm pressure increases the bias of the support arm in the prestressed support position and conversely favors the release of the clamping of the support arm when changing the effective direction.

c) embodiments

Fig. 1:

Einen Schrittantrieb gemäß dem Stand der Technik,

Fig.: 2:

die erfindungsgemäße Klemmzwinge,

Fig.: 3:

den Schrittantrieb der Klemmzwinge in zwei Einstellungen,

Fig.: 4:

unterschiedliche Konstellationen der Klemmzwinge,

Fig. 5

einen Schrittantrieb mit mehreren fest konturierten Wirkflanken,

Fig. 6

einen Schrittantrieb mit flexiblen Wirkflanken und

Fig. 7

einen Schrittantrieb mit fest konturierten, verstellbaren Wirkflanken.

Embodiments according to the invention are described in more detail below by way of example. Show it:

Fig. 1:

A stepper drive according to the prior art,

Fig .: 2:

the clamping clamp according to the invention,

Fig .: 3:

the stepper drive of the clamp clamp in two settings,

Fig .: 4:

different constellations of the clamp clamp,

Fig. 5

a stepper drive with several firmly contoured active edges,

Fig. 6

a stepper drive with flexible active edges and

Fig. 7

a stepper drive with firmly contoured, adjustable active edges.

Figure 1 shows a conventional stepper drive according to the prior art, as used for example in a commercial clamping clamp.

In this case, in the longitudinal direction 10 in the interior of the base part 2 ', mounted in the transverse walls push rod 4', which represents the clamping member, pushed forward, so pushed to the left in Figure 1, with the help of especially the push arm 23 ':

In the following, the terms "home position" and "operating state" are defined by the function of the stepper drive:

The push rod 4 'extends through a Schubarmöffnung 23 a of the push arm 23' therethrough, for which in a defined angular position, the starting position, the push arm 23 'sufficient clearance between the inner periphery of the Schubarmöffnung 23 a and the outer periphery of the push rod 4' is present, for easy pushing to allow the push rod.

From this initial position of the push arm 23 'with its one end in the pressing direction 12, ie in Figure 1 to the left, be pivoted (actuation state), wherein the extension direction of the Schubarmöffnung 23 a more and more deviates from the longitudinal direction 10 of the push rod 4' and on its outer circumference jammed and thereby the push rod 4 'in the pressing direction 12 entrains.

In general, the extension direction of the Schubarmöffnung 23a is exactly perpendicular to the plane of the push arm 23 ', and the starting position the exact right-angled position of the push arm 23 'to the longitudinal direction 10 or already slightly inclined to the operating end in the pressing direction.

The pivoting is effected by means of a hand operated by the user pivot lever 21 '(operating state), which is moved back together with the push arm 23' in the starting position after releasing, e.g. due to a push arm spring 26 'extending around the push rod 4, biasing the push arm 23' to the home position.

However, this retraction of the push arm would usually cause the push rod 4 'also moves back at least partially. To avoid this, the push rod 4 'extends through a likewise transverse support arm 24' through the Stützarmöffnung 24a through, in which - depending on the inclination of the support arm - also jamming is possible.

However, since the support arm 24 is biased by a Stützarmfeder 25 'in the direction of maximum inclination and thus tilting of the support arm 24' relative to the push rod 4 '(initial position), in the direction in which the push rod 4' would also move in backward movement , the push rod 4 'can not move back through the support arm 24' upon release of the tensioning lever 21 '.

The push rod 4 'so only to the rear, in Figure 1 to the right, are withdrawn when the support arm 24' is actively pivoted against the force of the support arm 25 'in a position (actuation state) in which he is not on the push rod 'jammed by tilting and thus the push rod 4' can then be pulled out by hand to the rear (operating state). Also, a passage of the push rod 4 'through the push arm 23' is easily possible, since this is biased anyway by the spring in the starting position in which the displacement of the push rod 4 'against the pressing direction, ie in Fig. 1 to the right, is possible.

With such a stepper drive, however, neither a switching of the pressing direction 12 is possible, certainly not with the same hand with which the user holds the clamping clamp.

FIGS. 2 and 3, which illustrate a detail enlargement from FIG. 2 b, show a clamping clamp 1 with a step drive 20 developed further in comparison with the design of FIG.

In principle, such a clamping clamp 1 consists of a base part 2, on which the clamping part 3, which is to apply a clamping force relative to the base part 2, is mounted movable and, above all, fixable.

For this purpose - as usual with clamping clamps - in the base part 2 extending in the longitudinal direction 10 push rod 4 of the clamping part 3 out, and at least in the unloaded initial state at least in the pressing direction slidably guided, from which approximately at right angles the clamping extension 3a strives.

Analogously and usually parallel to the clamping extension 3a, the base part 2 has a base extension 2a, in which in commercial clamping clamps a clamping insert 5, which contains a threaded spindle 8, which extends in the longitudinal direction 10, is guided.

Such a clamping insert 5, especially one containing a threaded spindle 8 extending in the longitudinal direction 10 may also be present in a clamping clamp according to the invention.

However, a threaded screw which can be screwed in and against the clamping direction opens up additional possibilities, for example the application of pressing force by means of the pressing head 9 with a threaded spindle 8 screwed far forward in a groove or other recess of a workpiece, for example on the bottom of a U-profile.

In the rest of the base part 2 is a manual drive, in particular stepper 20, housed, the push rod 4 in the desired clamping direction 12a or b relative to the base part 2 extends or retracts.

However, for the purpose of pushing objects apart, the extension direction may also be the clamping direction.

Moreover, the push rod 4 terminates freely at the end remote from the clamping extension 3a, so that the entire base part 2 can be pulled off the push rod 4 and rotated 180 ° again can be plugged (see Figures 4), so that then with otherwise unchanged base part. 2 and especially unchanged position of the switch 22, will be discussed below, now the clamping direction 12 would be the opposite direction.

The use of a clamping insert 5 also in the clamping clamp 1 according to the invention has additional advantages:

On the one hand, the clamping insert 5 can be inserted into one of a plurality of differently far radially spaced from the longitudinal extent of the push rod 4, insert receptacles 6a, b.

On the other hand, the clamping insert 5, if it itself contains a threaded spindle 8 as in the case shown, with a sufficiently large spindle lever 7 and correspondingly low pitch of the threaded spindle 8 are used to increase the force applied by the stepper drive 20 clamping force even further by turning the Screw 8 by means of the spindle lever. 7

Another advantage of the clamping clamp 1 according to the invention is a smaller spreading of the clamping clamp in the loaded state, ie a bending of the clamping clamp, so that clamping extension 3a and base extension 2a are largely as in the unloaded state parallel to each other.

In conventional clamping clamps, this spreading is relatively strong, of course, depending on the bending stiffness of the push rod 4 and especially its length, but also depending on the quality of the fit between push rod 4 and their leadership in the base part 2 and the corresponding guide length.

In the clamping clamp according to the invention, the base part 2 in the longitudinal direction 10 is much longer than in commercial clamps due to the existing pistol-like handle, which is also traversed over its entire length from the push rod 4, resulting in a much greater overall guide length. The fit between the outer circumference of the push rod 4 and the inner circumference of the guide, in particular in the base part 2, can be selected to be lower than in the conventional clamping clamps, so that overall results in a lower spread.

The stepper 20 works in principle as explained with reference to the figure 1 to the prior art, and has in accordance with the push rod 4, on the one hand the push arm 23 and on the other hand, the support arm 24 penetrates, the push arm 23 moves at its operating end of the clamping lever 21 in the pressing direction and is moved back by the Schubarmfeder 26 back to the starting position.

Also, the clamping lever 21 itself is biased by a lever spring 30 in its initial position.

Due to further features, however, this stepper drive 20 has additional advantages:

While the push arm 23 and support arm 24 are shown in side view in FIG. 2, with a view into the open side of a half shell of the base part 2, these two arms 23, 24 are cut open in the illustration of FIG. 2b along their longitudinal extension, so that the push arm opening 23a and the Schubarmöffnung 24a are better visible through which the push rod 4 extends therethrough.

FIGS. 3a and 3b are correspondingly enlarged detailed representations, drawn in detailed sectional views analogous to FIG. 2b, and differ only in the pressing direction 12a / b represented by the position of the changeover switch 22, which are downward along the longitudinal direction 10 in FIG. 3a and in FIG 3b is directed upward (as in Figures 2). In the following, Fig. 3a is described:

The switchability of the pressing direction 12 is effected by a switch 22 displaceable in this case in the longitudinal direction 10, the handle part 22d of a slot of the base part 2 projects and can be grasped and adjusted, and is connected to a support member 22e, which in the interior of the base part. 2 is guided displaceably in the longitudinal direction 10.

The support end 23 c of the push arm 23 is located on the same side of the push rod 4 as the support member 22 e of the switch 22, and is connected thereto by a train / compression spring 27 a, which is firmly attached to a corresponding pin on the support end 23 c, which - the lateral guide on the push rod 4 through the shells of the base part 2 - the storage of the push arm 23 represents. This support point of the push arm 23 is thus adjustable by means of the switch 22 from top to bottom corresponding to the end positions 22a, b of the switch 22 and the additional spring action in the base part second

Since the operating end 23b of the push arm 23 engages not on an outer contour, but on an inner contour 21 'of the clamping lever 21, which is designed here approximately triangular, sitting on the actuating end 23b roller 31 in the end positions of the switch 22 with either one of the active edges 21 a, b of this inner contour 21 'are in contact, which are designed so that in the operating state of the clamping lever 21, this effective surface of the push arm 23 from the initial position in which the Schubarmöffnung 23 a loosely surrounding the push rod 4, (operating state) in that the push arm opening 23a is increasingly inclined to the push rod 4 and jammed with the side surface and is taken from this in the pressing direction 12.

Also, the support arm 24 is at its, the switch 22 adjacent end by turn a tension / compression spring 27b connected to the handle portion 22d of the switch 22 and thus also in its inclination and thus effective direction of the one side to the other side with respect are transposed to the longitudinal direction 10 perpendicular transverse direction 11, wherein in each case a movement of the push rod 4 against the pressing direction 12 is prevented.

For this purpose, the pivot axis of the support arm 24 is located on the side facing away from the switch 22 and is in this case by receiving the bearing end 24c of the support arm 24 between two e.g. formed prism-shaped projections of the base part 2.

The bearing end 24c of the support arm and the support end 23c of the push arm of the two arms are thus on opposite sides with respect to the push rod 4, as well as the two actuating ends 23b, 24b, wherein the actuating end 23b of the push arm 23 on the side of the clamping lever 21 and the operating end 24b of the support arm 24 is on the side of the switch 22 and thus on the side facing away from the clamping lever 21 side.

In addition, located in the center position 22c of the switch 22 of the push arm 23 and the support arm 24 in a middle position between their two respective starting positions, so that in this middle position of the switch 22, the push rod 4 is freely displaceable in both directions to the base part 2.

In the end positions of the switch 22, however, a manual forward sliding of the push rod 4 in the pressing direction 12 is also possible, but not contrary to the pressing direction 12, because this is indeed prevented by the support arm 24 and the push arm 23:

Accordingly, in Figure 3a, the switch 22 at the upper end position 22a as well as the operating end 24b of the support arm 24 and thus also the roller 31 in abutment against the upper active surface 21 a.

In which the user holds the pistol grip-type lower part of the base part 2 in the hand while using his fingers the tensioning lever 21 on the base part 2 (operating state), the operating end 23 b is displaced downwardly by means of the active surface 21 a and in the Schubarmöffnung 23 a the push rod 4 initially jammed and taken on further clamping movement of the push arm 23 in the pressing direction 12a, ie down.

The tension roller 31 at the operating end 23 b of the push arm 23 moves from the end point 33 a of the active surface 21 a, which represents the starting position, to the end point 33 b, which represents the end of the operating state at the other end of the active surface 21 a, as in Fig. 3b shown for the tension roller 31, but at different switching position of the switch 22nd

After releasing the clamping lever 21, this is withdrawn by the lever spring 30 in the starting position (as Fig. 3a shows) and the push arm 23 acted upon by the tension compression spring 27a and thereby also pushed back into the starting position.

In FIGS. 3b, the change-over switch 22 is in its lower end position 22b and accordingly also the operating end 24b of the support arm 24 and also the support end 23c of the push arm 23, whereby a pressing direction 12b is achieved in an upward direction. Fig. 3b1 shows the situation with relaxed tensioning lever 21 (initial position), Fig. 3b2 when used on the base part 2 position (operating state).

Accordingly, the tension roller 31 thereby moves from the end point 33c (initial position) along the active flank 21b in FIG. 3b up to its upper end point 33b (end of the actuation state, ie in the case of the tensioning lever 21 fully engaged with the grip part), wherein the tension pulley 31 one Distance 32b measured in the pressing direction 12b between these end points 33b, c overcomes.

The achievable with a stroke, so completely pulling the clamping lever 21 from the starting position to the end of the operating state, measure of longitudinal movement (distances 32a and b) of the tension roller 31 thus represents the size of the longitudinal movement of the push rod 4 at a stroke of the clamping lever 21, and thus the gear ratio of the entire stepper drive 20:

The lower is the distance 32a or b overcome in the longitudinal direction 10 with a stroke of the clamping lever 21, the higher is the force applied to the push rod 4 and thus the clamping part 3 in the longitudinal direction 10 with the same force on the clamping lever 21, whereupon with reference to FIGS ff. will be discussed in more detail.

Figures 3 further show that the pivotable clamping lever 21 is not mounted directly in the base part 2, but via a bearing pin 28 in a self-moving, namely pivotable, bearing arm 29, which is preferably not only in the figures 2b and 3, not only behind but also extends transversely in front of the push rod 4.

The storage end located in a fixed bearing point 29 c is located on the side facing away from the switch 22 side, while the operating end 29 b is located on the side of the switch 22 and is connected to the operating end 24 b of the support arm 24.

This causes when switching the switch 22 from one to the other end position 22a to 22b not only the support arm 24 is changed in its pivotal position with respect to the transverse direction 11, but also the inclination of the bearing arm 29 is adjusted by analogy.

By arranging the bearing pin 28 between the bearing end 29 c and the operating end 29 b is pressed by pressing the clamping lever 21 by means of the Bearing pin 28 on the bearing arm 29 exerted a pivoting force, each acting in the pivoting direction that is firmly biased to the bearing arm 29 at the operating end connected support arm 24 in the blocking pivot position (actuation state).

The effect of the support arm 24 biasing in this position train / compression spring 27b is so massively reinforced by the pivot arm 29, so that a much stronger clamping action of the support arm 24 can be achieved, as would be reached only by the spring 27b.

This increased bias of the support arm 24 causes even after releasing the clamping lever 21 in the starting position, the push rod 4 springs back only very slightly against the previous pressing direction 12, and thus only a very small clamping force loss after releasing the clamping lever 21 occurs.

Again, this in turn affects both possible pressing directions 12a, b, depending on the position of the switch 22nd

The base part 2 consists of two mutually juxtaposed half-shells, with corresponding recesses on the mutually facing contact surfaces to receive the aforementioned movable parts and to leave a passage for the push rod 4 free.

The movements described are all likely to run in the same plane, namely the plane of drawing of FIGS. 2 and 3, that is to say the contact surface of the two mirror-image half shells of the base part 2.

The figures 4 show different constellations of the clamping clamp according to the invention, which are possible in that the entire base part 2 withdrawn from the push rod 4 and pushed onto the handle for this purpose, the rear free end of the push rod 4 in a different position and the clamping insert about the longitudinal axis or a transverse axis turned pushed and can accordingly serve different purposes:

Thus, Figure 4a shows a constellation in which the base part 2 is pushed onto the push rod 4 so that the clamping extension 3a and the base extension 2a protrude to the same side, and the clamping insert 5 used with its pressing head 9 in the clamping extension 3a against the base extension 2a has.

This constellation is used for clamping, so the bracing of a workpiece between base extension 2a and clamping extension 3a.

FIG. 4b serves the same purpose, however, for workpieces dimensioned larger in the clamping direction, for which a greater distance between base extension 2a and clamping extension 3a is necessary. Accordingly, in contrast to the solution of FIG. 4 a, in the case of FIG. 4 b the base part 2 with its handle for the clamping part 3 is pushed towards the push rod 4.

FIG. 4c shows the constellation as in FIG. 4a, but rotated by 180 ° with the clamping insert 5, namely with its pressing head 9 pointing away from the clamping extension 3a in the base extension 3a.

This arrangement is used to spread apart, so pressing apart, two components, set in the press head 9 of the base extension 2a and clamping member 3a therebetween and moved apart.

The constellation of Figure 4d serves the same purpose, but for again larger spaced workpieces, which is why - analogous to Figure 4b - in turn, the base part 2 with the handle forward, pushed against the clamping extension 3a, is pushed onto the push rod 4.

In the case of the constellation according to FIG. 4e, insofar as is analogous to FIG. 4a, the clamping insert 5 with its clamping head 9 points in the direction of the clamping extension 3a, However, the clamping extension 3a of the clamping part 3 protrudes in a different direction from the push rod 4 as the base extension 2a.

This embodiment is used for clamping in special situations, for example, the clamping of workpieces on a large-scale clamping table with a greater distance from the edge:

In the position shown in FIG. 4e, the clamping clamp 1 can be fastened, for example screwed, to the clamping extension 3a pointing downwards on such a clamping table, so that a workpiece can then be pressed against the clamping table by means of the base part 2.

Overall, in a push rod 4 with rectangular, but not square, cross-section, the base part 2 in two different rotational positions relative to the longitudinal axis 10 of the push rod 4 are pushed onto this, with square cross-section even in four different rotational positions.

Exemplary solutions are described with reference to the following FIGS. 5 to 7 in order to change the maximum producible force, in particular with increasing pressure build-up at the clamping point, which can be set automatically or manually. The increase in the maximum force is achieved by reducing the longitudinal distance 32a or b, over which the push arm 23 is moved with a stroke of the clamping lever 21, since the applied force is greater, the lower the distance, so the distance 32a, b, is.

Fig. 5a shows a solution in which the inner contour 21 'of the clamping lever 21 in the direction of the figures 5a-c, ie transversely to the main plane of the clamping lever 21 and thus in the direction of the roller axis 34 of the tension roller 31 - two or more consecutive active edges 21 a , 21 * a and 21 b, 21 * b, respectively, on which the tension roller 31 can roll off optionally:

For this purpose, the tension roller 31 in the direction of the roller axis 34 relative to the clamping lever 21 and the inner contour 21 'displaceable, preferably relative to the push arm 23, in whose forked end it is mounted on a pivot pin 34 '.

The tension roller 31 can be manually reciprocated in the direction of the roller axis 34, but preferably it is biased in accordance with FIGS. 5d and 5e by means of a spring in one direction.

According to the figures 5d and e, the outer contour of the tension roller 31 is substantially cylindrical (31 '), at a front end, namely facing away from the plate spring 35 end, but conically shaped (31 *).

Similarly, the axial (in the direction of the roller axis 34) extension of the active edges 21 a, b of the inner contour 21 'of the clamping lever 21 is divided into a normal active edge 21 a, b, which is perpendicular to the main plane of the contour 21', and on the cylindrical periphery 31 'of the tension roller 31 can run, and an adjoining obliquely corresponding to the angle of the conical periphery 31 * of the tension roller 31 standing inclined flank 21 * or 21 * b available on which the tension roller 31 roll with this conical periphery 31 * can when it is in the biased by the plate spring 35 end position.

In the direction of view of the roller axis 34 (FIGS. 5a-c), the inclined active flanks 31 * a / b plus the normal active flanks 21a / b lie further in the longitudinal direction 10, that is to say the pressing direction 12. Episode:

The distances 32 between the end points 33 of the respective active surfaces are different in the direction of the roller axis 34 successive active surfaces, ie: distance 32a between the end points 33a and 33b of the active surface 21 a is less than the distance 32 * a between the endpoints 33 * a and 33 * b of the effective area 21 * a.

In this case, the end points 33a / c and 33 * a / c of the corresponding active surfaces, which correspond to the starting position of the clamping lever 21, are congruent one above the other.

This configuration causes up to a certain confirmation force of the hand lever 21, so long as the bias of the plate spring 35 in the direction of the roller axis 34 is not overcome, the tension roller 31 with its conical circumference 31 * on the conical active edges 21 * a and 21 * b rolls, and per stroke of the hand lever 21 a relatively large longitudinal distance 32a and 32b overcomes. With increasing pressure build-up at the clamping point, however, an ever greater actuation force of the clamping lever 21 is necessary.

As soon as this actuation force increases to such an extent that the tensioning roller 31 is displaced against the force of the spring 35 in the direction of the roller axis 34 via the wedge effect of the conical circumference 31 ', whereby the tensioning roller 31 no longer extends in the axial region of the conical active surfaces 21 * a or b, but on the active surfaces 21 a / b with vertical arrangement to the main plane of the clamping lever 21 runs and thus per stroke only the reduced longitudinal distance 32 a and b overcomes, therefore, the push rod 4 is moved with greater pressing force in the pressing direction 12.

At which operating force on the clamping lever 21 this is the case, depends on the choice of the biasing force of the spring 35 from.

Instead of the described lateral surface of the tension roller 31 with a cylindrical conical periphery and adjoining it, the axial joining of two different sized cylindrical sections, optionally with conical outer edges therebetween, can be chosen to be at a limit for the displacement of the tension roller 31 operating force on the clamping lever 21st to avoid unwanted switching back and forth of the tension roller in its axial direction during the run along the active flank.

For this purpose, the two axially offset, corresponding to each other active surfaces such as 21 a, 21 * a at the beginning, ie in the range from the starting position, only slightly in the transverse direction of the path of movement spaced apart from each other, and then only increasingly remove from each other. In addition, the active surface, which is intended to cooperate with the smaller diameter of the tension roller 31, in its initial area still inclined to the vertical with respect to the main plane of the clamping lever 21, and would only be perpendicular in their course, so that in the inclined region of the tensioner role due their on the outer edge still existing conical design at the beginning of the movement path would still be applied in the direction of axial displacement.

6 shows a solution in which the distances 32a / b covered by the tension roller 31 per stroke of the hand lever 21 are changed by the fact that the active edges 21a / b change automatically:

The active flanks 21a / b are designed as resilient fingers 36a / b projecting into the interior of the inner contour 21, the ends of which are fastened in the vicinity of the starting position corresponding to the end points 33a, which are the active flanks 21a / b in the clamping lever 21.

The inner edges of the fingers 36a / b form the active edges 21a / b for the tension roller 31, while the outer edges of the fingers 36a / b at a distance from the inner contour 21 ', and in this direction until it rests against the inner contour 21' elastic can be bent, whereby the distance to be overcome per stroke 32a / b decreases steplessly.

The spring force of the fingers 36a / b is designed so that at the beginning of the use of the clamping clamp, so if the clamping lever 21 is moved with moderate hand force, because the clamping member 3 is still in idle stroke or despite applying to the workpiece only a small resistance by the Workpiece is opposed, run the tension roller 31 on the fingers 36 a / b in the initial state and a relatively large distance 32 a / b is overcome per stroke.

With increasing actuation force on the clamping lever 21, the fingers 36a / b are increasingly pressed against the tension roller 31, thereby bending in the direction of the inner contour 21 'and the per stroke of the clamping lever 21 overcome longitudinal distance 32a and b is increasingly lower and on the Push rod 4 and the clamping part 3 applied clamping force the greater.

Fig. 7 shows a solution in which the active edges 21 a / b are indeed contoured, in their position to the clamping lever 21, however, are changeable, which in turn the distance traveled per stroke longitudinal spacings 32 a / b are affected.

For this purpose, the annular inner contour 21 'of which the active edges 21a / b each represent a part formed in a hub 37 which is rotatably mounted in a corresponding circular opening of the clamping lever 21.

In this case, the rotary disk 37 is pivotable back and forth between two end positions, preferably delimited by a nose 37 projecting radially outwards from the rotary disk 37 and extending over the outer circumference of the rotary disk 37, e.g. projects radially outward and between two settings A and B.

The end positions A and B of the turntable shown in Figs. 7a / b differ in that e.g. the end position A of FIG. 7a for the active edge 21 a means a small distance 32a, while the end position B for this active edge 21 a results in a large distance 32 a.

For the active edge 21 b, it is exactly the opposite.

The turntable 37 can either be adjusted manually by the user in one of the end positions A or B and remains there by means of engagement or dead center formation of the movement of the turntable.

An automatic changeover of the turntable 37 can be effected by being biased by means of the force of a spring - depending on the selected pressing direction 12 and thus the position of the switch 22 - in a pivoting direction, preferably in the pivoting direction with still large longitudinal distance 32a / b and the force of this biasing spring is overcome only at a defined value of the operating force on the clamping lever 21 and then the turntable 37 is automatically swiveled increasingly or digitally towards the other end position.

LIST OF REFERENCE NUMBERS

1

terminal clamp

2

base

2a

Base extension

3

clamping part

3a

Clamping extension

4

pushrod

5

clamping insert

6a / b

insert receiving

7

spindle lever

8th

screw

9

brawn

10

longitudinal direction

11

transversely

12a, b

pressing direction

20

step drive

21

clamping lever

21 '

inner contour

21a / b

active edge

21 * a / b

active edge

22

switch

22a / b

end position

22c

center position

23

push arm

23a

Schubarmöffnung

23b

actuating end

23c

bracket end

24

support arm

24a

Stützarmöffnung

24b

actuating end

24c

storage end

25

support spring

26

Schubarmfeder

27a

Tension / compression spring

28

bearing bolt

29

bearing arm

30

lever spring

31

idler

31 '

cylindrical circumference

31 *

conical scope

32 a / b

Distance in the longitudinal direction

33 a / b / c

Endpoint effective area

34

roller axis

34 '

axle

35

feather

36a / b

finger

36

turntable

37 '

nose

38

diverter

FROM

end position

Claims (14)

Clamp clamp (1) with a base part (2), in which the clamping part (3) is movably received relative to the base part (2), characterized in that
the base part (2) comprises a manual drive, in particular a step drive (20). Clamping clamp according to claim 1,
characterized in that - The drive, in particular the step drive (20), a reciprocable clamping lever (21) which is in particular arranged on the clamping part (3) and for moving the clamping part (3) in the clamping direction (12), and / or especially - The clamping part (3) in the base part (2) with its push rod (4) is guided displaceably, in the transverse direction (11) to the longitudinal direction (10) of the push rod (4) projecting clamping extension (3a) in the longitudinal direction (10) relative to also in the transverse direction (11) of the base part (2) projecting base extension (2a) can apply a clamping force, and / or in particular - The clamping part (3) relative to the base part (2) is pivotable, applying a clamping force between the two parts, and / or in particular - The actuator of the drive, in particular the clamping lever (21) on the base part (2) is arranged so that it can be operated by the same hand of the user who simultaneously holding the base part (2), and the base part (2) in particular handle-shaped is trained. Clamping clamp according to one of the preceding claims,
characterized in that - The drive, in particular stepper drive (20) has a switch (22), by means of which the direction of movement of the clamping part (3), ie the pressing direction (12), can be changed by 180 °, and / or in particular - The switch (22) on the base part (2) is arranged so that it can be operated by the same hand holding the base part (2), in particular the thumb, and / or in particular - The switch (22) next to the two end positions (22 a / b) for the two directions of movement can assume a central position (22 c) in which the clamping part (3) relative to the base part (2) is freely movable. Clamping clamp according to one of the preceding claims,
characterized in that - The drive, in particular step drive (20) comprises a clamping force-holding device, which causes after release of the actuating element, in particular of the clamping lever (21), the clamping force applied by the clamping clamp decreases only to a small extent, and / or in particular - The base extension (2 a) and / or the clamping extension (3 a) have a clamping insert (5) which is variable in its transverse distance from the push rod (4) and in particular widely spaced transversely spaced insert receptacles (6 a, b) of the base extension (2a) or clamping extension (3a) can be used, and / or in particular - The clamping insert (5) in a clamping direction, in particular the longitudinal direction (10), extending threaded spindle (8), with their help between base extension (2a) and clamping extension (3a) by turning the threaded spindle (8) by means of a corresponding spindle lever (7) greater clamping forces can be applied, as by means of the clamping lever (21) possible. Clamp clamp (1) with a base part (2), in which the clamping part (3) is movably received relative to the base part (2), characterized in that
the force applied to the tensioning lever (21), in particular varying degrees, depending on the direction of action of the cutting drive, actuating force of the tensioning lever (21), and / or manual or automatic setting of the working edges, is translated to the push arm (23). Stepper drive (20), in particular for use in a clamping clamp (1) according to one of the preceding claims, with - One of the push rod (4) penetrated, relative to the push rod (4) by means of the clamping lever (21) pivotable, transverse thrust arm (23) and - One of the push rod (4) penetrated, transverse to this support arm (20) which is pivotable and / or displaceable relative to the push rod (4), - Wherein Schubarmöffnung (23 a) are dimensioned so that they can be run through loosely in the starting position of the push rod (4) and in the opposite pivoted operating state of the inner periphery of the opening (23 a) against the outer periphery of the push rod (4) jammed. Step drive according to one of the preceding claims,
characterized in that - The support arm (24) by means of a support spring (25) is biased in the starting position in the direction in which the push rod (4) in attempted displacement against the pressing direction (12) in the support arm (24) tilted and jammed, and / or in particular - The thrust arm (23) by means of the clamping lever (21) can be pivoted from the initial position into the operating state with entrainment of the push rod (4) in the clamping direction, and / or in particular - The push arm (23) is biased by a Schubarmfeder (26) in the starting position. Step drive according to one of the preceding claims,
characterized in that - The pivoting direction (from the initial position in the operating state) of the push arm (23) from clockwise to counterclockwise and vice versa for the purpose of switching the direction of action can be adjusted, in particular by displaceability of the push arm (23), especially if it is in its initial position, in particular Lengthwise (10), so that its actuating end (23b) with another area, in particular another active edge (21a / b) of the clamping lever (21), in contact, and / or in particular - The displacement of the push arm (23) at least also a pivoting of the push arm (23) relative to the push rod (4), in particular from one to the other side of the transverse direction (11), and / or in particular - The the actuating end (23b) opposite, on the other side of Schubarmöffnung (25) lying, support end (23c) of the push arm (23) is displaceable in the longitudinal direction, in particular by means of the switch (22) in the longitudinal direction (10) displaceable and in particular lockable is. Step drive according to one of the preceding claims,
characterized in that - The support end (23c) of the push arm (23) in particular by means of a combined tension / compression spring (27a) opposite the switch (2) in the activating direction of the push arm (23) is biased, and / or in particular - The clamping lever (21) by means of a Schubarmfeder (26) biases the push arm and clamping lever together in the deactivated position, and / or in particular - That the active edges (21 a / b) of the clamping lever (21) are contoured differently and / or in particular characterized on the tensioning lever (21) applied force, in particular varying degrees, depending on the direction of action of the cutting drive, actuating force of the clamping lever (21), and / or manual or automatic adjustment of the active edges, on the push arm (23) is translated, and / or in particular - That the active edges (21 a / b) of the clamping lever (21) are elastically deformable. Step drive according to one of the preceding claims,
characterized in that - The clamping lever (21) transversely to its main plane offset two, in particular even more than two, active edges (21 a, 21 * a and 21 b, 21 * b) whose end points, in particular the end position corresponding end points (33 b, 33 * b), in the longitudinal direction (10) are spaced apart and - The tension roller (31) is designed differently in its axial course for running on the axially spaced different active edges (21 a / b and 21 * a / b), and / or in particular - The active edges (21a / b) in a relative to the clamping lever (21) adjustable adjusting element, in particular a turntable (37) are added, by adjusting the longitudinal spacing (32a / b) between the end points (33a / b or 33a / c) of the active edges (21 a / b), and / or in particular - The support arm (24) is pivotable, in particular by means of the switch (22) is pivotable, between two bez. the transverse direction (11) opposite inclinations. Step drive according to one of the preceding claims,
characterized in that - The support arm (24) in each case in the direction of increasing inclination to the transverse direction (11) is biased by spring force, in particular by means of a single combined tension / compression spring (27b), in particular between the switch (22) and the one end of the support arm ( 24), and / or in particular - The clamping lever (21) about a bearing pin (28) is pivotable, the displaceable, in particular in the longitudinal direction (10), relative to the base part (2) is displaceable, and / or in particular - The bearing pin (28) is received in a bearing arm (29) which is received transversely to the push rod (4) pivotable in the base part (2) and in particular by means of the switch (22) is pivotable. Step drive according to one of the preceding claims,
characterized in that - The means of the switch (22) selectable center position (22c) of the push arm (26) relative to the clamping lever (21) both push arm (23) and support arm (24) holds in the deactivated position, and / or in particular - In the middle position of the clamping lever (21) the base part (2) from the free end of the clamping member (3) completely removable and rotated about the longitudinal direction (10) and / or a transverse axis (11), eg with a changed pressing direction, back on this is deferrable, and / or in particular - In the release direction, usually for extending the clamping part (3) from the base part (2), acting active edge (21 a) of the clamping lever (21) is designed so that it is a force peak, especially at the beginning of the actuation of the clamping lever ( 21), which is larger than that in the opposite direction when closing applicable highest force. Method for clamping one or more workpieces by means of a clamping clamp comprising a base extension (2a) and a clamping extension (3a), wherein the base part (2) carrying the base extension (2a) is partially designed as a handle,
marked by
following steps: - Grasping the base part (2) on the handle, Positioning the clamping clamp (1) with the base extension (2a) and / or the clamping extension (3a) on the workpiece, - Actuation of the actuating element, in particular of the clamping lever (21), with the holding hand and thereby relative movement of the base part (2) and clamping part (3) to each other and clamping the workpiece. Method according to claim 13,
characterized in that - By means of the thumb of the holding hand, a changeover switch (22) on the base part (2) for switching the pressing direction (12) is adjusted, in particular before the beginning of the use of the clamping clamp (1), and / or in particular - By means of the thumb of the holding hand of the switch (22) is brought into neutral center position and the clamping part (3) relative to the base part (2) can be moved, in particular before the start of the insert and in adaptation to the dimensions of the workpiece, and / or especially - By means of the user's holding hand, in particular the thumb, a diverter (38) for changing the position of the active edges (21 a / b) can be actuated.

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