DE102004051833A1 - terminal clamp - Google Patents

Abstract

By using a stepper in a clamp clamp, which can be operated by the same hand of the user who holds the clamp, also more difficult clamping tasks can be solved by only one user alone. For this purpose, a special type of stepper drive, in particular by means of switching the effective direction, etc., is necessary.

Description

1. Application

The Invention relates to a clamp clamp and a stepper drive, how it can be used to drive such a clamp clamp.

II. Technical background

through a clamp clamp become two in wood and metal processing workpieces pressed together relative to each other, usually pressed against each other, which usually as a prefix for a later one final Fixation by screws, welding or the like is used.

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

III. Presentation of the invention

The usual design a clamping clamp is a screw clamp, in which after the loose Opposite of clamping part and base part - with the to be pressed workpieces in between - by means of a Threaded spindle, e.g. extending through the base member, the desired Clamping force is applied. Instead of a threaded spindle are also Knob and other mechanisms 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 both relative to each other and relative to the clamp clamp correctly,
• - The clamp clamp applied to the workpieces and
• - Then has to 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 is for understood the concerns of the present application every drive the one step forward moving causes the relatively moving parts and / or in which the manually operated Drive element is moved gradually, so for example. Back and forth is turned back and forth etc., where only one hub is a working stroke and the other Hub of the return stroke is.

Regarding the Schrittantriebs, as he especially for such training the clamp can be used, it is known that a conventional Stepper drive can be operated by means of a clamping lever with one hand.

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

a) Technical task

Regarding the Klemmzwinge is therefore the object of the invention is both the positioning as well as the application of a high, in particular automatically adjusting clamping force, loosening and opening the To be able to accomplish the ferrule with only one hand of the operator, so that the other hand to hold and to position the two workpieces free is.

Regarding the Stepping drive is therefore the object of the invention is the stepper drive in such a way that all functions of only a hand of the operator can be performed and in particular, the direction of action of the stepper drive still reversible should be.

b) Solution of the task

These The object is solved by the features of claims 1, 12 and 29. advantageous embodiments emerge from the dependent claims.

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

By the training of clamping part and base part with transversely projecting projections as with conventional Clamp is for the user no change when using the clamps necessary, since the relative movement is the same as in conventional Clamps, namely the longitudinal displacement the push rod in the base part.

alternative For this purpose, the clamping part can also be pivoted relative to the base part be, so a circular motion or a different arc-shaped movement run through.

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

By Actuate the switch can the direction of movement of the clamping part in the opposite direction are adjusted, so what for the same Clamping means switching from clamp to release, or it can do with it too a new clamping operation, the clamping direction to be changed, e.g. from pressing against each other on pressing apart.

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

By Arrangement of the switch on the base part in the grip area of the hand the user, in particular the user's thumb, can this switching from again the same hand of the user and during the Clamping performed be that no second hand is needed, thus for holding of the workpiece or the workpieces to disposal stands.

By doing the switch next to the two end positions, the two directions of movement can assume a middle position, this middle position used for it be that the clamping part opposite the base part is freely displaceable in both directions of movement.

By arranging a clamping insert in the corresponding extensions of Base part or clamping part, such a clamping insert also in its transverse distance be varied by the push rod, putting in different spaced recording positions can be used, whereby the transverse distance the clamping point can be influenced.

The The clamping force applied by the step drive can be increased even further. if the clamping insert in addition contains a threaded spindle, which is actuated by means of a spindle lever, wherein the force increase is dependent from the length of the Spindle lever and thread pitch - by means of the threaded spindle the force applied by the stepper drive clamping force can be increased.

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, relative to the push rod in longitudinal direction shifted and pivoted, and from a positive angle relative to the transverse direction to a negative angle and vice versa.

By the displaceability of the support end of the push arm can do this very simple, especially with the help of the switch, to the one Active connection consists, for example by means of a spring, in particular a combined compression spring, both in the pressure direction as also springs in the pulling direction, thus close to both directions of action of the support end and therefore without jamming the push arm in the initial position pretensions.

Also the support arm is by means of a support arm spring biased in the starting position.

Also The clamping lever itself is by means of a clamping lever spring in his Biased initial position, in which he goes back to let go, by re-pressing to shift 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 in the selected functional position with active positioning of the changeover switch in one of the two end positions (over-dead-center positions), and
• - moves to the neutral center position without active positioning of the switch, in which the push rod is freely displaceable in both directions.

By the different contouring of the active edges on the clamping lever for the Both functional positions of the push arm can both the force curve as well as the absolute power level, the while the operation the clamping lever are applied by the cutting drive, given different become.

By changing the course of the effective active edges or the change between several existing active edges, in particular automatically and in particular during the 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.

By the pivotability and the support arm relative to the transverse direction from one to the other inclination Also, the support arm is umstellbar according to the two directions of action.

By doing the support arm also from the switch by means of a preferably mechanical connection, especially a combined tension spring, is switched, can by means of a single switch the entire stepper drive be changed in its direction of action at once.

By the bearing of the clamping lever to a bearing pin whose position not fixed, but is movable, and in particular in a pivotable bearing arm, the effect of the spring, which the support arm biased, supported be by the bearing pin in the pivotable bearing arm with respect Pivot point of the bearing arm is arranged so that the clamping lever - at its Actuation - on the bearing arm practiced Pressure the bias of the support arm in the preloaded support position reinforced and vice versa when changing the effective direction so that the release of Clamping of the support arm favors.

c) embodiments

embodiments according to the invention in the following example closer described. Show it:

1 : A step drive according to the prior art,

2 : the clamping clamp according to the invention,

3 : the stepper drive of the clamp clamp in two settings,

4 : different constellations of the clamp,

5 a stepper drive with several firmly contoured active edges,

6 a stepper drive with flexible active edges and

7 a stepper drive with firmly contoured, adjustable active edges.

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

This is a longitudinal direction 10 inside the base part 2 ' , in its transverse walls mounted push rod 4 ' , which represents the clamp part, pushed forward, so in 1 pushed to the left, 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 23a the push arm 23 ' through what, in a defined angular position, the initial position of the push arm 23 ' sufficient clearance between the inner circumference of the Schubarmöffnung 23a and the outer periphery of the push rod 4 ' is present to allow easy sliding of the push rod.

From this starting position, the push arm 23 ' with one end in the direction of pressing 12 , so in 1 to the left, be pivoted (operating state), wherein the extension direction of the Schubarmöffnung 23a getting stronger from the longitudinal direction 10 the push rod 4 ' deviates and jammed on the outer circumference and thereby the push rod 4 ' in pressing direction 12 entraining.

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

The pivoting takes place by means of a lever operated by the user's hand 21 ' (Operating state), which after releasing together with the push arm 23 ' is moved back to the starting position, for example due to a to the push rod 4 extending around Schubarmfeder 26 ' that the push arm 23 ' biased to the starting position.

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

Because the support arm 24 however by a support arm spring 25 ' in the direction of maximum inclination and thus tilting of the support arm 24 ' opposite the push rod 4 ' is biased (initial position), in the direction in which the push rod 4 ' would also move in reverse motion, the push rod 4 ' when releasing the clamping lever 21 ' not by the support arm 24 ' move back through.

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

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

The 2 as well as 3 that made a detail magnification 2 B represent, show a clamping clamp 1 with one opposite the design of the 1 further developed stepper drive 20 ,

In principle, there is also such a clamp clamp 1 from a base part 2 to which the clamping part 3 which has a clamping force relative to the base part 2 should apply, is movable and fixed above all fixable.

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

Analog and usually parallel to the terminal extension 3a also has the base part 2 a basic process 2a in, in the case of commercial clamping clamps a clamping insert 5 , which is a threaded spindle 8th contains, in the longitudinal direction 10 runs, is guided.

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

However, a threaded spindle 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 screwed far forward 8th in a groove or other recess of a workpiece, for example. On the bottom of a U-profile.

Otherwise base part 2 is a manual drive, especially stepper drive 20 , housed the push rod 4 in the desired clamping direction 12a or b relative to the base part 2 retracts or retracts.

however can also for the purpose of separating objects the extension direction should be the clamping direction.

Otherwise, the push rod ends 4 at the terminal extension 3a facing away free, so that the entire base part 2 from the push rod 4 can be removed and rotated by 180 ° can be plugged back (see 4 ), so that then with otherwise unchanged base part 2 and above all unchanged position of the switch 22 , will be discussed below, now the clamping direction 12 the opposite direction would be.

The use of a clamping insert 5 also in the clamp clamp according to the invention 1 has additional benefits:
On the one hand, the clamping insert 5 in one of several different degrees radially from the longitudinal extent of the push rod 4 spaced, insert shots 6a , b be used.

On the other hand, the clamping insert 5 , provided he himself as in the case drawn a threaded spindle 8th contains, with a sufficiently large spindle lever 7 and correspondingly low thread pitch of the threaded spindle 8th be used to that by means of the stepper drive 20 To increase the applied clamping force by turning the threaded spindle 8th by means of the spindle lever 7 ,

Another advantage of the clamp clamp according to the invention 1 is a smaller spreading of the clamping clamp in the loaded state, so a bending of the clamp, so clamping extension 3a and basic process 2a as far as possible in the unloaded state parallel to each other.

In conventional clamps this spreading is relatively strong, of course, depending on the bending stiffness of the push rod 4 and above all their length, but also depending on the quality of the fit between push rod 4 and their leadership in the base part 2 as well as the corresponding Füh approximately length.

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

The stepper drive 20 works in principle as based on the 1 explained in 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, with the push arm 23 at its operating end of the clamping lever 21 moved in the pressing direction and by the Schubarmfeder 26 is moved back to the starting position.

Also the cocking lever 21 itself is by means of a lever spring 30 biased to its original position.

Due to further features this stepper drive has 20 however, additional benefits:
During push arm 23 and support arm 24 in 2 are shown in the side view, with a view into the open side of a half-shell of the base part 2 , these are both arms 23 . 24 in the presentation of the 2 B shown cut along its longitudinal extent, so that the Schubarmöffnung 23a as well as the push arm opening 24a are better visible through which the push rod 4 extends through.

The 3a and 3b are correspondingly enlarged detailed representations, drawn in detail sectional views analog 2 B , and differ only by means of the position of the switch 22 shown pressing direction 12a / b, along the longitudinal direction 10 in 3a down and in 3b upwards (as in the 2 ). The following will be 3a described:
The switchability of the pressing direction 12 is by a longitudinal in this case 10 movable switch 22 causes its handle 22d from a slot in the base part 2 protrudes and can be grasped and adjusted, and with a support member 22e is connected, which is inside the base part 2 longitudinal 10 slidably guided.

The holder end 23c the push arm 23 is on the same side of the push rod 4 like the support part 22e of the switch 22 , and is with this over a train / compression spring 27a connected to a corresponding pin on the support end 23c firmly attached, what - in addition to the lateral guidance on the push rod 4 through the shells of the base part 2 - The storage of the push arm 23 represents. This bracket point of the push arm 23 is thus by means of the switch 22 adjustable from top to bottom according to the end positions 22a , b of the switch 22 and the additional spring action in the base part 2 ,

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

Also the support arm 24 is at his, the switch 22 adjacent end by means of turn a tension / compression spring 27b with the handle part 22d of the switch 22 connected and thus also in its inclination and thus effective direction from one side to the other side with respect to. To the longitudinal direction 10 vertical transverse direction 11 be changed, with one movement of the push rod 4 against the pressing direction 12 is prevented.

For this purpose, there is the pivot axis of the support arm 24 on the switch 22 turned away side and is in this case by receiving the storage end 24c of the support arm 24 between two eg prism-shaped projections of the base part 2 educated.

The end of storage 24c the support arm and the support end 23c the thrust arm of the two arms are thus on opposite sides of the thrust rod 4 , as well as the two operating ends 23b . 24b , wherein the operating end 23b the push arm 23 on the side of the clamping lever 21 and the end of the operation 24b of the support arm 24 on the side of the switch 22 and thus on the tension lever 21 facing away.

Additionally are in the middle position 22c of the switch 22 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 in both directions freely to the base part 2 is displaceable.

In the end positions of the switch 22 on the other hand is a manual forward sliding of the push rod 4 in pressing direction 12 also possible, but not contrary to the pressing direction 12 , because this is yes by the support arm 24 and the push arm 23 prevents:
Accordingly, located in 3a the switch 22 at the upper end position 22a as well as the end of the operation 24b of the support arm 24 and hence the role 31 in the plant at the upper effective area 21a ,

In which the user the pistol grip-like lower part of the base part 2 holds in his hand and with his fingers the cocking lever 21 to the base part 2 (Actuating state), the operating end becomes 23b by means of the active surface 21a shifted down and in the Schubarmöffnung 23a the push rod 4 initially jammed and further clamping movement of the push arm 23 in pressing direction 12a , so down, taken away.

The tension roller 31 at the end of the operation 23b the push arm 23 moves from the endpoint 33a the effective area 21a , which represents the starting position, to the end point 33b , at the other end of the effective area 21a represents the end of the operating state, as in 3b for the tensioner 31 shown, but at different switching position of the switch 22 ,

After releasing the clamping lever 21 this is done by the lever spring 30 retired to the starting position (like 3a shows) and the push arm 23 through the tension spring 27a acted upon and thus also pushed back to the starting position.

In the 3b is the switch 22 in its lower end position 22b and accordingly also the end of the operation 24b of the support arm 24 and also the bracket end 23c the push arm 23 , whereby a pressing direction 12b directed upward is achieved. 3b1 shows the situation with relaxed cocking lever 21 (Starting position), 3b2 at the base part 2 used position (operating state).

Accordingly, the tension roller moves 31 doing so from the endpoint 33c (Home position) along the active edge 21b in 3b up to its upper end point 33b (End of the operating state, ie in fully drawn on the handle clamping lever 21 ), with the tension roller 31 a distance 32b measured in pressing direction 12b between these endpoints 33b , c overcomes.

The one stroke, so completely pulling the clamping lever 21 from the starting position to the end of the operating state, achievable degree of longitudinal movement (distances 32a or b) 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 transmission ratio of the entire stepper drive 20 :
The lower at a stroke of the clamping lever 21 in the longitudinal direction 10 overcome distance 32a or b is, the higher is the same force on the clamping lever 21 the on the push rod 4 and thus the clamping part 3 applied force in the longitudinal direction 10 , on the basis of the 5 ff. will be discussed in more detail.

The 3 continue to show that the pivoting clamping lever 21 not directly in the base part 2 is stored, but via a bearing pin 28 in a self-moving, namely pivotable, bearing arm 29 preferably twice in the 2 B and 3 not only behind but also in front of the push rod 4 extending transversely.

The storage end located in a fixed depository 29c is located on the switch 22 opposite side, while the operating end 29b on the side of the switch 22 is located and with the operating end 24b of the support arm 24 connected is.

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

By arrangement of the bearing pin 28 between the end of storage 29c and the end of the operation 29b is when pressing the clamping lever 21 by means of the bearing pin 28 on the bearing arm 29 exerted a pivoting force which acts in each of the pivoting direction, that with the bearing arm 29 at the operating end firmly connected support arm 24 is biased into the blocking pivot position (operating state).

The effect of the support arm 24 in this position biasing tension / compression spring 27b So it is through the swivel arm 29 solid reinforced, so that a much stronger clamping action of the support arm 24 can be achieved, as by its spring alone 27b could be reached.

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

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

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

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

The 4 show different constellations of the clamping clamp according to the invention, which are characterized in that the entire base part 2 from the push rod 4 pulled off and touched on the purpose for this purpose, the rear free end of the push rod 4 pushed in different positions and the clamping insert can be pushed rotated about the longitudinal axis or a transverse axis and accordingly serve different purposes:
So shows 4a a constellation in which the base part 2 on the push rod 4 so deferred is that the clamping extension 3a and the basic process 2a protrude to the same side, and the clamping insert 5 with his pressing head 9 in the terminal extension 3a used against the base process 2a has.

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

4b serves the same purpose, but for workpieces larger in clamping direction, for which a greater distance between base extension 2a and terminal extension 3a necessary is. Accordingly, in contrast to the solution of 4a - at 4b the base part 2 with his handle to the clamping part 3 pointing to the push rod 4 postponed.

4c shows the constellation like 4a , but with the clamping insert 5 rotated by 180 °, namely with its pressing head 9 from the terminal extension 3a groundbreaking, in the basic process 3a arranged.

This arrangement serves to spread apart, so pressing apart, two components, in the pressing head 9 of the basic process 2a and clamping part 3a interposed and moved apart.

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

In the constellation according to 4e shows - in this respect analogous to 4a - The clamping insert 5 with his chuck 9 in the direction of the clamping extension 3a , but the terminal extension protrudes 3a of the clamping part 3 in a different direction from the push rod 4 like the basic process 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 in 4e shown position, the clamp clamp 1 with the clamping extension 3a attached pointing down on such a clamping table, for example, are screwed, so then by means of the base part 2 a workpiece can be pressed against the clamping table.

Overall, with a push rod 4 with rectangular, but not square, cross section the base part 2 in two different rotational positions with respect to the longitudinal axis 10 the push rod 4 be postponed to this, with square cross-section even in four different rotational positions.

Based on the following 5 to 7 Example solutions are described to change the maximum producible force, in particular to increase with increasing pressure build-up at the clamping point, which can be adjusted 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 with a stroke of the clamping lever 21 is moved because the applied force is greater, the less the distance, so the distance 32a , b, is.

5a shows a solution in which the inner contour 21 ' of the clamping lever 21 in the direction of the 5a -C, ie transverse to the main plane of the clamping lever 21 and thus in the direction of the roller axis 34 the tension roller 31 - Two or more consecutive active edges 21a . 21 * a respectively. 21b . 21 * b comprising, on which the tension roller 31 can optionally roll:
For this purpose, the tension roller 31 in the direction of the roller axis 34 relative to the clamping lever 21 and its inner contour 21 ' displaceable, preferably relative to the push arm 23 , in whose forked end they are on a pivot pin 34 ' is stored.

The tension roller 31 can be in the direction of the roller axis 34 be manually adjustable back and forth, preferably it is according to 5d and 5e but biased by a spring in one direction.

According to the 5d and e is the outer contour of the tension roller 31 essentially cylindrical ( 31 ' ), at a front end, namely that of the diaphragm spring 35 opposite end, but conical ( 31 * ).

Analog is also the axial (in the direction of the roller axis 34 ) Extension of the active edges 21a , b the inner contour 21 ' of the clamping lever 21 divided into a normal active edge 21a , b, which are perpendicular to the main plane of the contour 21 ' stands, and on the cylindrical circumference 31 ' the tension roller 31 can run, and an adjoining obliquely according to the angle of the conical circumference 31 * the tension roller 31 standing oblique active edge 21 * respectively. 21 * b present on the tension roller 31 with this conical scope 31 * can roll when they are in through the diaphragm spring 35 preloaded end position is located.

In the direction of the roll axis 34 ( 5a -C) are the inclined active edges 31 * a / b plus the normal active edges 21a / b in the longitudinal direction 10 , ie the pressing direction 12 , further inside. Episode:
The distances 32 between the endpoints 33 the respective active surfaces are in the direction of the roller axis 34 successive active areas differently, ie: distance 32a between the endpoints 33a and 33b the effective area 21a is less than distance 32 * a between the endpoints 33 * a and 33 * b the effective area 21 * a ,

Here are the endpoints 33a / c and 33 * a / c of the corresponding active surfaces, the initial position of the clamping lever 21 match, congruently one above the other.

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

As soon as this actuating force increases so much that on the wedge effect of the conical circumference 31 ' the tension roller 31 against the force of the spring 35 is shifted in the direction of the roller axis 34 , causing the tension roller 31 no longer in the axial area of the conical surfaces 21 * a or b, but on the active surfaces 21a / b with vertical arrangement to the main plane of the clamping lever 21 runs and thus per hub only the reduced longitudinal distance 32a or b overcomes, therefore, so the push rod 4 with greater pressing force in pressing direction 12 emotional.

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 pulley 31 with cylindrical and adjoining conical circumference can also be the axial juxtaposition of two different sized cylindrical sections, optionally with conical outer edges in between, are selected to at one at the limit for moving the tensioner 31 lying actuating force on the clamping lever 21 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, for example 21a . 21 * a At the beginning, so in the range from the starting position, only slightly spaced in the transverse direction of the path of movement to each other, and then only increasingly from each other. Additionally, the effective area would be that with the smaller diameter of the tensioner pulley 31 to cooperate, 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, the tension roller would be acted upon in the direction of axial displacement due to their still existing on the outer edge conical design at the beginning of the movement path.

6 shows a solution in which the per stroke of the hand lever 21 from the tensioner 31 distances covered 32a / b be changed by the fact that the active edges 21a / b automatically change:
The active edges 21a / b are as springy, in the interior of the inner contour 21 protruding fingers 36a / b formed whose ends in the vicinity of the initial position corresponding to the end points 33a , the active flanks 21a / b in the cocking lever 21 are attached.

The inner edges of the fingers 36a / b form the active edges 21a / b for the tensioner pulley 31 while the Outside flanks of the fingers 36a / b at a distance from the inner contour 21 ' run, and in this direction even to the plant to the inner contour 21 ' can be bent elastically, resulting in the distance to be overcome per stroke 32a / b steplessly reduced.

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

With increasing operating force on the clamping lever 21 become the fingers 36a / b increasingly stronger against the tension roller 31 pressed, thereby bending in the direction of the inner contour 21 ' and the per stroke of the clamping lever 21 overcome longitudinal distance 32a or b becomes progressively smaller and that on the push rod 4 and the clamping part 3 applied clamping force the greater.

7 shows a solution in which the active edges 21a / b are firmly contoured, in their position to the clamping lever 21 however, are variable, which in turn the distance traveled per stroke longitudinal distances 32a / b be influenced.

For this purpose, the annular inner contour 21 ' from the active edges 21a / b each represent a part, in a turntable 37 formed in a correspondingly circular breakthrough of the clamping lever 21 is rotatably mounted.

The turntable 37 is between two end positions back and herverschwenkbar preferably limited by one of the hub 37 radially outwardly projecting nose 37 passing over the outer circumference of the turntable 37 eg projecting radially outwards and between two settings A and B.

The in the 7a / b illustrated end positions A and B of the turntable differ in that, for example, the end position A according to 7a for the active edge 21a a small distance 32a means during end position B for this active edge 21a a big distance 32a results.

For the active edge 21b it is the other way around.

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

An automatic conversion of the turntable 37 can be effected by these 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 a large longitudinal distance 32a / b, is biased and the force of this biasing spring only at a defined value of the operating force on the clamping lever 21 is overcome and then the hub 37 is automatically increasingly or digitally pivoted in the direction of the other end position.

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 scope

31 *

conical scope

32a / b

distance longitudinal

33a / 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 (36)

Clamp Clamp ( 1 ) with - a base part ( 2 ), - in which the clamping part ( 3 ) relative to the base part ( 2 ) is movably received, characterized in that the base part ( 2 ) 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 reciprocating cocking lever ( 21 ), in particular on the clamping part ( 3 ) is arranged and for moving the clamping part ( 3 ) in the clamping direction ( 12 ) serves. Clamping clamp according to claim 1 or 2, characterized in that the clamping part ( 3 ) in the base part ( 2 ) with its push rod ( 4 ) is displaceably guided, whose in the transverse direction ( 11 ) to the longitudinal direction ( 10 ) of the push rod ( 4 ) protruding clamping extension ( 3a ) longitudinal ( 10 ) relative to also in the transverse direction ( 11 ) from the base part ( 2 ) projecting base extension ( 2a ) can apply a clamping force. Clamping clamp according to claim 1 or 2, characterized in that the clamping part ( 3 ) relative to the base part ( 2 ) is pivotable, applying a clamping force between the two parts. Clamping clamp according to one of the preceding claims, characterized in that the actuating element of the drive, in particular the clamping lever ( 21 ) at the base part ( 2 ) is arranged so that it from the same hand of the user who at the same time the base part ( 2 ), can be operated, and the base part ( 2 ) is designed in particular handle-shaped. Clamping clamp according to one of the preceding claims, characterized in that the drive, in particular step drive ( 20 ) a switch ( 22 ), with the aid of which the direction of movement of the clamping part ( 3 ), ie the pressing direction ( 12 ) can be changed by 180 °. Clamping clamp according to one of the preceding claims, characterized in that the switch ( 22 ) at the base part ( 2 ) is arranged so that it is from the same hand, the base part ( 2 ) holds, in particular the thumb, can be operated. Clamping clamp according to one of claims 5 or 6, characterized in that the switch ( 22 ) next to the two end positions ( 22a / b) a middle position for the two directions of movement ( 22c ), in which the clamping part ( 3 ) relative to the base part ( 2 ) is freely movable. Clamping clamp according to one of claims 5 or 6, characterized in that the drive, in particular step drive ( 20 ), a clamping force holding device comprises, which causes after releasing the actuating element, in particular of the clamping lever ( 21 ) The applied by the clamping clamp clamping force only to a small extent decreases. Clamping clamp according to one of the preceding claims, characterized in that the base extension ( 2a ) and / or the clamping extension ( 3a ) a clamping insert ( 5 ), which in its transverse distance from the push rod ( 4 ) is variable and in particular in differently far transversely spaced insert shots ( 6a , b) the basic process ( 2a ) or clamping extension ( 3a ) can be used. Clamping clamp according to one of the preceding claims, characterized in that the clamping insert ( 5 ) in the clamping direction, in particular the longitudinal direction ( 10 ), extending threaded spindle ( 8th ), by means of which, between the basic process ( 2a ) and clamping extension ( 3a ) by turning the threaded spindle ( 8th ) by means of a corresponding spindle lever ( 7 ) greater clamping forces can be applied than by means of the clamping lever ( 21 ) possible. Clamp Clamp ( 1 ) with - a base part ( 2 ), - in which the clamping part ( 3 ) relative to the base part ( 2 ) is movably received, characterized in that on the clamping lever ( 21 ) applied force, in particular different 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. 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 transversely to this standing support arm ( 20 ), the relative to the push rod ( 4 ) is pivotable and / or displaceable, - whose Schubarmöffnung ( 23a ) are dimensioned so that they are loose in the initial position of the push rod ( 4 ) and in the opposite pivoted operating state of the inner circumference of the opening ( 23a ) relative to 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 initial position in the direction in which the push rod ( 4 ) when trying to move against the pressing direction ( 12 ) in the support arm ( 24 ) tilted and jammed. Step drive according to one of the preceding claims, characterized in that the push 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. Step drive according to one of the preceding claims, characterized in that the push arm ( 23 ) by means of a push arm spring ( 26 ) is biased to the starting position. Stepping drive according to one of the preceding claims, characterized in that the pivoting direction (from the initial position to the operating state) of the push arm ( 23 ) can be adjusted from clockwise to counterclockwise and vice versa for the purpose of switching the effective direction, in particular by displaceability of the thrust arm ( 23 ), in particular when it is in its initial position, in particular in the longitudinal direction ( 10 ), so that its end of operation ( 23b ) with another region, in particular another active edge ( 21a / b) of the clamping lever ( 21 ), get in touch. Step drive according to one of the preceding claims, characterized in that 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 ). Step drive according to one of the preceding claims, characterized in that the actuating end ( 23b ) opposite, on the other side of the Schubarmöffnung ( 25 ), support end ( 23c ) of the push arm ( 23 ) is displaceable in the longitudinal direction, in particular by means of the switch ( 22 ) longitudinal ( 10 ) is displaceable and in particular lockable. Step drive according to one of the preceding claims, characterized in that the holder 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. Stepping drive according to one of the preceding claims, characterized in that the tensioning lever ( 21 ) by means of a push arm spring ( 26 ) Biases push arm and cocking lever together to the deactivated position. Stepper drive, in particular for use in a clamping clamp ( 1 ), characterized in that the active edges ( 21a / b) of the clamping lever ( 21 ) are contoured differently and / or in particular by the on the clamping lever ( 21 ) applied force, in particular different 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. Step drive according to one of the preceding claims, characterized in that the active edges ( 21a / b) of the clamping lever ( 21 ) are elastically deformable. Stepping drive according to one of the preceding claims, characterized in that - the tensioning lever ( 21 ) transversely to its main plane offset two, in particular even more than two, active edges ( 21a . 21 * a respectively. 21b . 21 * b ) whose end points, in particular the end position, have corresponding end points ( 33b . 33 * b ), longitudinal ( 10 ) are spaced apart from each other and - the tension roller ( 31 ) is designed differently in its axial course for running on the axially spaced different active edges ( 21a / b or 21 * a / B). Step drive according to one of the preceding claims, characterized in that the active edges ( 21a / b) in a relative to the clamping lever ( 21 ) adjustable adjusting element, in particular a turntable ( 37 ), by adjusting the longitudinal distances ( 32a / b) between the endpoints ( 33a / b or 33a / c) the active flanges ( 21a / b). Step drive according to one of the preceding claims, characterized in that 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 one end of the support arm ( 24 ) is arranged. Stepping drive according to one of the preceding claims, characterized in that the tensioning lever ( 21 ) about a bearing pin ( 28 ) is pivotable, the displaceable, in particular in the longitudinal direction ( 10 ), opposite the base part ( 2 ) is displaceable. Step drive according to one of the preceding claims, characterized in that the bearing pin ( 28 ) in a bearing arm ( 29 ), which is transverse 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 middle position ( 22c ) of the push arm ( 26 ) relative to the clamping lever ( 21 ) both push arm ( 23 ) as well as support arm ( 24 ) in the deactivated position. Step drive according to one of the preceding claims, characterized in that in the middle position of the clamping lever ( 21 ) the base part ( 2 ) from the free end of the clamping part ( 3 ) completely removable and around the longitudinal direction ( 10 ) and / or a transverse axis ( 11 ), ie, for example, with a changed pressing direction, is again pushed onto this. Step drive according to one of the preceding claims, characterized in that in the release direction, usually for extending the clamping part ( 3 ) from the base part ( 2 ), acting active edge ( 21a ) of the clamping lever ( 21 ) is designed so that it has a force peak, in particular at the beginning of the actuation of the clamping lever ( 21 ), which is larger than the force applied in the opposite direction when closing 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 basic process ( 2a ) supporting base part ( 2 ) is partially designed as a handle, characterized by the following steps: - Grasping the base part ( 2 ) on the handle, - positioning the clamp ( 1 ) with the basic process ( 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. A method according to claim 33, characterized in that by means of the thumb of the holding hand a switch ( 22 ) at the base part ( 2 ) for switching the pressing direction ( 12 ) is adjusted, in particular before the beginning of the use of the clamp ( 1 ). Method according to one of the preceding method claims, characterized in that by means of the thumb of the holding hand 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 beginning of the use and in adaptation to the dimensions of the workpiece. Method according to one of the preceding method claims, characterized in that by means of the user's holding hand, in particular its thumb, a diverter ( 38 ) for changing the position of the active edges ( 21a / b) can be operated.