EP2085184A2 - Driving rod tensioning device - Google Patents

Abstract

Between an end (3) where tensioning force is applied and a thrust bearing (5) linked to an axial guide device (AGD) (1) there is a bent-lever mechanism (BLM) (6) that is made from adjusting links (6',6'') with articulated interlinks and can be placed in a tensioning and opening position. Varying the layout of the BLM in relation to a slide rod (2) in a tensioning position determines and adjusts a clearance in different ways between the end of the slide rod where tensioning force is applied and the AGD. This clearance defines a tensioning position for a free tensioning end.

Description

The invention relates to a push rod clamping device according to the preamble of patent claim 1.

Such push rod tensioning devices are after the DE-STA-CO brochure from July 2003, page 4.7 and after the US 3,912,251 known. Such tensioning devices have a simple structure insofar as they consist of an axial guide for a thrust rail projecting at both ends of the thrust rod, wherein between the spannkraftaufbringseitigen end of the push rod and a thereto arranged at a distance abutment a toggle mechanism is articulated. The axial guide for the push rod and the associated, arranged at a distance abutment for articulation of the toggle mechanism are summarized from correspondingly solid sheet to a holder. As clamping or adjusting mechanism for the push rod toggle mechanisms are provided in both cases. As far as the adjustability of the push rod is concerned in order to bring it into the tensioning position, this can be done with appropriate access to the toggle mechanism by hand or (see the DE-STA-CO Prospectus, July 2003, page 12.17 ) be effected by hydraulic, pneumatic or electric drive. In all these push rod clamping devices, the travel of the push rod is determined by the toggle mechanism, ie, the travel or the stroke of the push rod is obtained when the toggle mechanism is placed in an extended position.

The invention has for its object to improve a push rod clamping device of the type mentioned in terms of their variability.

This object is achieved according to the invention with a push rod clamping device of the type mentioned by the features cited in the characterizing part of claim 1.

According to the invention it is thus provided that by arrangement variation of the toggle mechanism in relation to the located in the clamping position push rod defining the clamping position of the free exciting end distance between the spannkraftaufbringseitigem end of the push rod and the axial guide is different adjustable and fixable.

In other words, therefore, is provided by the nature of the connection or the arrangement variation of the toggle mechanism between the drive-side end of the push rod and the abutment for a different degree of the workpiece side protruding freely from the axial guide push rod.

In a specific embodiment in this regard, designed as a boom connecting element is arranged on the axial guide with its longitudinal extent parallel to the push rod extension and provided with the coaxial with the push rod extension disposed abutment, between which and the push rod, the toggle joint is articulated. So if the clamping position of the push rod, ie, the workpiece side protruding from the axial guide part of the push rod from small to large or vice versa, so only the fixation of the boom to solve, adjust the boom in the other position and set again. In this case, it is thus possible to set at least two different travel paths or clamping end positions of the push rod on such a push rod clamping device, without fundamentally altering their simple construction principle, ie, the field of application of a push rod such a clamping device is extended accordingly, and it must not be kept ready two clamping devices, each with different stroke.

Alternatively (or additionally) can also be provided according to the dependent claim 7 that the abutment is formed fastened in different positions on the connecting element. This also results in each case different end positions of the push rod.

Another, same enabling, but to that extent other specific design, which can (but need not) without adjustability of the boom, results from the dependent claim 9, according to which the spannkraftaufbringseitige end of the push rod has at least two articulation points for articulation of the toggle mechanism , In this embodiment, the toggle mechanism is connected at different points with the push rod, this leads, based on the clamping position, to a shorter protruding from the axial guide part of the push rod and at the other, located at the very end of the push rod body, to a more outstanding Part of the push rod.

After US 4,257,583 is a push rod clamping device of a special kind is known in which although a stroke adjustment is provided, but which serves a completely different purpose and that of a Feinsteinstellung a clamping jaw with respect to an opposing clamping jaw. The push rod tensioning device according to US 4,257,583 in fact, in contrast to that mentioned in the opening paragraph US 3,912,251 one behind the other two cooperating tensioning or toggle mechanisms, of which the push rod side serves to the push rod with her jaw by hand only Once in abutment position to bring the workpiece and coupled with an actuating cylinder second, to apply the actual clamping force. Since this diffizible dual drive system requires precise adjustment, the second toggle mechanism operable by the actuating cylinder is provided with fine adjustment elements which consist of a threaded pin which can be fixed at the end of a housing arranged on the axial guide by means of lock nuts and thus can be fine adjusted. The threaded pin extends coaxially aligned with the push rod, ie, the push rod with its axial guide, the double toggle mechanisms and the threaded pins are arranged one behind the other and require a correspondingly long, the actual axial extension of the housing, taking into account that in this device because of only intended fine adjustment only minimal axial adjustments of the threaded pin come into consideration. In addition, this labile double system requires the assignment of stops for the two toggle mechanisms in order to bring it at all in an extended position and for effective clamping force transmission can. Unless one is an even more extreme extension of the per se long housing in the clamping device after the US 4,257,583 wants to take into account, this fixture is not suitable for making adaptable to different strengths to clamped workpieces to make correspondingly large Hubgrößeneinstellungen the push rod, apart from that with correspondingly large extension of the threaded pin such centimeter-length adjustments a variety of cumbersome rotations of the two locknuts would require.

In contrast to the push rod clamping device according to the US 4,257,583 is there required, the attacks mentioned housing having the push rod clamping device according to the invention reduced to a simple, inherently stable and Ausbiegesteifen boom, but in one case is variable in length and formed in at least two positions fixable; and which can remain unchanged in another case, but depending on the connection of the toggle mechanism on the push rod this quasi shortened or prolonged comes into effect. In a third case, the arrangement of the abutment is varied to the connecting element.

The push rod clamping device according to the invention and its advantageous developments and embodiments according to the dependent claims are explained in more detail with reference to the drawing of exemplary embodiments.

It shows schematically

FIG. 1

the clamping device in side view and in the basic position;

FIG. 2

the tensioning device according to FIG. 1 in tension position;

FIG. 3

the tensioning device according to FIG. 1 with extended boom in basic position;

FIG. 4

the tensioning device according to FIG. 3 in tension position;

FIG. 5

the tensioning device in side view and in a special embodiment;

FIG. 6

the tensioning device according to FIG. 5 in tension position;

FIG. 7

the tensioning device according to FIG. 5 with changed connection between push rod end and clamping mechanism;

FIG. 8

the tensioning device according to FIG. 7 in tension position;

FIG. 9

the tensioning device according to Figure 1 to 4 in plan view and

FIG. 10

in side view another embodiment of the push rod clamping device.

The in the FIGS. 1 to 10 illustrated push rod clamping device consists of an axial guide 1 for a push rod 2 having on one side of the axial guide 1 a free exciting 20 and on the other side of the axial guide 1 a spannkraftaufbringseitiges end 3, wherein between this end 3 and connected to the axial guide 1 abutment 5 is a lockable and openable position, from two articulated actuators 6 ', 6''formed toggle mechanism 6 is arranged.

For the push rod clamping device according to the invention is now essential that by arrangement variation of the toggle mechanism 6 in relation to the located in clamping position push rod 1, a clamping position of the free clamping end 20 defining distance between the spannkraftaufbringseitigem end 3 of the push rod 2 and the axial guide 1 is formed differently adjustable and fixable ,

With reference to the FIGS. 1 to 4 Concretely implemented, a push rod clamping device is used, in which between the axial guide 1 and the abutment 5 of the toggle lever mechanism 6 designed as a boom connecting element 4 is arranged as the distance producing component, based on the clamping position of the toggle mechanism 6, these in their distance to End 3 of the push rod 2 is formed positionable in different positions. The preferably extended in its longitudinal extent parallel to the push rod cantilever is adjustable in length adjustable and fixable.

FIG. 1 shows the push rod clamping device with the push rod 2 in the retracted position. FIG. 2 shows the same device in clamping position, so that the toggle mechanism 6 has been pressed in the extended position or in the over-center position by means of an actuator 6 "of the toggle mechanism 6 arranged lever 9. The set thereby stroke is denoted by H and provides the achievable with this device Maximalhub dar.

The connecting element 4 is preferably formed from a first and a second part, wherein the first part is formed as a retaining extension 11 and fixed to the axial guide 1. Arranged on the second part of the abutment 5, wherein that between the first and the second part of the connecting element 4, a longitudinal slot guide 12 and to this form-fitting fixing elements 13 are provided. For attachment of the fixing elements 13, the holding extension 11 has a plurality of fixing element receptacles 16 arranged in series. Incidentally, the cantilever can also be formed from two spaced-apart parallel strands or, because of its stability to be demanded, even more advantageously be formed as a U-profile, which is open to the push rod 2 in a suitable manner on the axial guide 1 or on the housing G in the sense of FIG FIG. 1 or stationary in the sense of FIG. 5 to attach.

If, for example, the maximum stroke H of the push rod 2 is to be reduced for workpieces of a workpiece row of different thickness, then only the fixing elements 13 are to be loosened, and the boom 4 is in the position according to FIG FIG. 3 reset and fix again, then according to FIG. 4 After the toggle mechanism 6 has been brought into an extended position, a correspondingly reduced stroke H 'has resulted.

The above-mentioned operation of the push rod clamping device by means of a manually operated control lever 9 is not mandatory in the whole, ie, the toggle mechanism 6 may also be coupled to a pneumatically, hydraulically or electrically actuated pivotally mounted actuator 10, which in FIG. 5 for the sake of simplicity is schematically indicated, although it is a special and of the vorerläuterten contrasting embodiment, which will be described in more detail below.

Starting from the same push rod tensioning device, as mentioned in the introduction, according to the embodiment FIGS. 5 to 8 likewise the Hubgrößenverstelleffekt, as described above, achieved in that the spannkraftaufbringseitige end 3 of the push rod 2, which is expedient anyway anyway not cylindrical because of the connection of the actuator 6 'of the toggle mechanism 6, to the stroke adjustment with at least two, as shown, articulation points 8, 8 'is provided for the tensioning mechanism 6. In this case, therefore, the boom 4, as in FIG. 6 illustrated, directly and immovably connected to the axial guide 1. The FIGS. 5 and 6 illustrate the connection to the Anlenkstelle 8 and the FIGS. 7 and 8 the connection to the other articulation point 8 ', wherein the FIGS. 6 and 8 respectively correspond to the clamping positions. The articulation of the actuator 6 'at the articulation point 8' is thus virtually equal to a shortening of the push rod 2, which in turn means that the workpiece-side part of the push rod 2 protrudes less in the clamping position from the axial guide 1. The arrangement or design of the abutment 5 on the non-adjustable boom 4 is to be made or designed so that the remaining length of the end 3 of the push rod 2 with the articulation point 8 with respect to the abutment 5 finds enough space in the provision. Incidentally, in addition to the different connections of the adjusting mechanism on the push rod end 3, a adjustability of the abutment 5 on the boom 4 in the sense of FIG. 10 or the length adjustability of the boom 4 are taken into consideration.

Depending on the distance setting of the abutment 5 (see FIGS. 1 to 4 ) or of the articulation of the tensioning mechanism 6 at one or the other articulation point 8, 8 'at the end 3 of the push rod 2 (see FIGS. 5 to 8 ), the different strokes of the push rod 2 arise automatically when the toggle mechanism 6 reaches its clamping position, ie, when, for example, the actuators 6 ', 6 "have taken their extended position or over-center position.

In itself, an end stop for the open position of the device is not absolutely necessary, but is preferred in this respect a training to the effect that the axial guide 1 is provided with a retraction position of the push rod 2 defining stop 14 for a arranged on the push rod 2 push rod stop 15. The stop 14, which may advantageously be designed adjustable, is in the Figure 1 to 4 indicated as a small line and the push rod stopper 15 as a small cross.

In concrete embodiment, in this regard, preferably designed as a housing G axial guide 1 is provided with a parallel to the push rod 2 slot guide 18 for the push rod stop 15, whose force introduction side end forms the stop 14 for the push rod stop 15, which in the plan view according to FIG. 9 something more clearly illustrated.

Of course, such Endstellungsanschläge also apply to the device training after the Figure 1 to 8 and 10 ,

In reference to FIG. 10 Finally, it is possible, as mentioned, possible to arrange the abutment 5 in correspondingly different positions on the boom with a correspondingly long trained connecting element 4 with the same effect and to fix. In this case, the abutment 5 has, on the one hand, an axis of rotation of the toggle lever mechanism 6 and, on the other hand, fixing elements for attachment to the connecting element 4.

LIST OF REFERENCE NUMBERS

1

axial guidance

2

pushrod

3

tension-applying end

4

connecting element

5

abutment

6

Toggle mechanism

8th

articulation

8th'

articulation

9

lever

10

actuator

11

Holding projection

12

Longitudinal slot guide

13

fixing

14

attack

15

Pushrod stop

16

Fixation element receiving

18

slot guide

20

free exciting

H

stroke

H'

reduced stroke

G

casing

Claims (16)

A push rod tensioning device comprising an axial guide (1) for a push rod (2) having on one side of the axial guide (1) a free tensioning end (20) and on the other side of the axial guidance (1) a tensioning end (3), between this end (3) and an abutment (5) connected to the axial guide (1) has a toggle mechanism (6) which can be brought into tensioning and opening position and consists of two articulated actuators (6 ', 6''),
characterized,
that by arrangement variation of the toggle mechanism (6) in relation to the located in the clamping position push rod (1) a clamping position of the free clamping end (20) defining distance between the spannkraftaufbringseitigem end (3) of the push rod (2) and the axial guide (1) and is formed fixable. Push rod clamping device according to claim 1, wherein between the axial guide (1) and the abutment (5) is provided a connecting element (4), preferably designed as a cantilever,
characterized,
that the connecting element (4) is adjustable in length adjustable and fixable. Push rod clamping device according to claim 2,
characterized,
that the connecting element (4) is formed from a first and a second part. Push rod clamping device according to claim 3,
characterized,
is that the first part formed as a holding projection (11) and secured to the axial guide (1). Push rod clamping device according to claim 3 or 4,
characterized,
that on the second part of the abutment (5) is arranged. Push rod clamping device according to one of claims 3 to 5,
characterized,
in that between the first and the second part of the connecting element (4) there are provided a longitudinal slot guide (12) and fixation elements (13) adapted to the shape. Push rod clamping device according to one of claims 1 to 6, wherein between the axial guide (1) and the abutment (5) is preferably designed as a connecting element (4),
characterized,
that the abutment (5) is securable in different positions on the connecting element (4). Push rod clamping device according to claim 7,
characterized,
in that the abutment (5) has, on the one hand, an axis of rotation of the toggle lever mechanism (6) and, on the other hand, fixing elements for attachment to the connecting element (4). Push rod clamping device according to one of claims 1 to 8, wherein between the axial guide (1) and the abutment (5) is preferably designed as a connecting element (4),
characterized,
spannkraftaufbringseitige that the end (3) of the push rod (2) at least two pivot points (8, 8 ') for the articulation of the toggle lever mechanism (6). Push rod clamping device according to claim 9,
characterized,
in that the articulation points (8, 8 ') are designed to receive an axis of rotation of the toggle lever mechanism (6). Push rod clamping device according to one of claims 2 to 10,
characterized,
in that the connecting element (4), which is preferably designed as a cantilever, extends parallel to the push rod (2). Push rod clamping device according to one of claims 1 to 11,
characterized,
that the preferably housing-like axial guide (1) for fixing the open position of the push rod (2) has a stop (14) which cooperates in the open position with a push rod stop (15) provided on the push rod (2). Push rod clamping device according to claim 12,
characterized,
that at the axial guide (1) provided stop (14) is adjustable. Push rod clamping device according to claim 12 or 13,
characterized,
that the push rod stop (15) is adjustable. Push rod clamping device according to one of claims 12 to 14,
characterized,
in that the axial guide (1) is provided with a slot guide (18), parallel to the push rod (2), for the push rod stop (15). Push rod clamping device according to claim 15,
characterized,
that the slot guide (18) forms the stop (14).

Images