EP0662567B1 - Rodless linear actuator - Google Patents

Abstract

The linear drive has a guide tube which through its side wall has a longitudinal slot and in which a piston is displaceably located in the longitudinal direction. At least one closure device closes the end side of the guide tube. A driven component is formed by a rib which is connected to the piston and which engages through the longitudinal slot. At least one separate profile component is arranged in the longitudinal slot (12) which extends at least along the longitudinal extent of at least one flank (13) of the longitudinal slot and is connected with a sealing band (16) so that between the sealing band and the guide tube (2) a securing connection is formed.

Description

The invention relates to a rodless linear drive with the features of the preamble of the claim 1.

Rodless linear drives generally have Guide tube in which a piston slidably as well as sealed. To derive the through the action of a pressure medium generated on the piston Force from the guide tube has a lateral one Slit on that of a web connected to the piston is reached. The slot or longitudinal slot extends at least over the whole of the piston continuous path and generally across the entire Length of the guide tube. That is why it is used to train Pressure medium chambers required, the longitudinal slot in the Seal areas where the piston is straight does not stand. A sealing tape is used for this, which is in contact with the longitudinal slot from the inside and also with a section sits in this. In the area of the piston the sealing tape is lifted inwards from the longitudinal slot, to clear the way for the dock that the Seals around the sealing tape. To work safely such to enable pressure-actuated linear drives it is necessary that the sealing tape at the longitudinal slot is held so that it does not sag inwards or falls.

DE 34 29 783 A1 describes a linear drive cylinder known in which the sealing the longitudinal slot Sealing tape two spaced apart and parallel has mutually arranged ribs or lips which reach through the longitudinal slot and each end are provided with a so-called bead. Both that Sealing tape as well as the ribs are made of flexible Material. The ribs are springy outwards, i.e. in Preloaded spreading direction away from each other and reach behind with their beads the longitudinal slot around the sealing tape to fix in the longitudinal slot.

With this linear drive cylinder this determines the Sealing tape used material the spring properties of the lips and thus how secure the sealing tape on the Guide tube is held. In addition, the ribs and Beaded out of the longitudinal slot, whereupon during installation of the linear drive cylinder in machines and systems is to be taken.

Furthermore, from the above-mentioned disclosure a linear drive cylinder is known in which the Has longitudinal slots with flanks provided with a longitudinal groove, into which the sealing tape with corresponding longitudinal beads intervenes.

Again, when designing the sealing tape and in the material selection for this to the desired and for inserting and removing the sealing tape the flexibility required due to the longitudinal slot to take.

In addition, a pressure medium cylinder is known from EP 0 260 344 A3 known with a longitudinally slotted guide tube, at the one from the inside on the guide tube at the longitudinal slot adjacent sealing tape with one from the outside the cover tape adjacent to the longitudinal slot interacts. For this purpose, the sealing tape has two outwards spaced parallel and longitudinal webs slightly arched away from each other, some Limit the space between yourself. The sealing tape engages with a piece provided on this and radially inward facing rib in this space one, due to the inclination of being in contact with each other standing surfaces a clamp or snap connection arises.

This pressure medium cylinder is next to the sealing tape the sealing tape is also required. Both tapes must are lifted from the longitudinal slot at the web and the bridge must be led around both bands.

It is also known from the above-mentioned patent application the sealing tape and the masking tape with a magnetic strip stick together, both in the sealing tape as well as corresponding ferromagnetic in the masking tape Steel straps are provided.

In this embodiment, a pressure medium cylinder must in addition to the sealing tape and the masking tape the magnetic strip is lifted out of the longitudinal slot, to the passage connected to the piston grant.

Based on this, it is an object of the invention to provide a rodless To create linear actuator that is simple The bridge can be passed through the longitudinal slot and where the sealing tape is securely in the longitudinal slot is held.

The above task is accomplished by a linear actuator with the characterizing features of the claim 1 solved.

The separate profile element arranged in the longitudinal slot forms a locking device with which in the Longitudinal slot engaging section of the sealing tape can be locked. The locking action can be done by suitable Design and dimensioning of the profile element largely regardless of the specific execution of the Sealing tape can be adjusted. Furthermore, it is possible a family of linear drives for different Pressures, working strokes and working speeds using a uniform basic semi-finished product for to create the guide tubes. Possibly necessary Deviations in the holding force of the sealing tape can be used by a suitable design of each Profile elements are taken into account. The Sealing tape is primarily for sealing the Guide tube responsible and can in terms of Material selection can be optimized for this function. On the other hand can the separately provided profile element both in terms of its material selection as well as in terms of its geometric design can be interpreted so that the sealing tape is optimally held in the longitudinal slot is. Finally, the sealing tape can wear can be reduced because of this when importing and executing in or from the longitudinal slot only a small one Deformation is subject.

Secure fastening of the profile element in the longitudinal slot results when the profile element is form-fitting is held. In addition, the profile element in the Longitudinal slot non-positive, i.e. for example by Clamp or cohesively, for example by means of Be secured. It is also possible the profile element only cohesively, e.g. E.g. to be fixed in the longitudinal slot by means of adhesive. However the positive fixation is a simple and cheap solution through which the profile element is permanent and is kept reliable.

For positive fastening of the holding element in the Longitudinal slot can at least on its flank be provided a groove in which the profile element with a Section sits. The assembly of the profile element on the The guide tube is made simply by inserting the profile element in the groove. According to the shape of the profile element the groove can be both rectangular and triangular or be shaped otherwise. It is crucial in everyone Case that the profile element related to the radial direction of the guide tube is held securely. To create a snap connection between the sealing tape and the with the profile element provided guide tube can Sealing tape on at least one of the flanks of the longitudinal slot facing side have a longitudinal recess, which extends over the entire length of the sealing tape extends. This longitudinal recess is on the profile element provided latching section assigned to the the flank of the longitudinal slot protrudes. If this rest section is held too resilient towards the groove, he snaps into the longitudinal recess of the sealing tape if this is in the longitudinal slot. Will the sealing tape pulled out from the longitudinal slot, deflects the locking section of the profile element and gives the sealing tape is free. This is not subject to any significant Deformation in the area of its longitudinal recess.

In one embodiment, the profile element has a oval cross-section and lies in a rectangular Groove. The profile element lies with its flat sides on two mutually parallel side walls of the groove on and protrudes with its round latching section into the longitudinal slot. This profile element is in during the rest process its cross section deformed. The semicircular or circular section The rest section becomes more or less flat pressed and the profile element is at least something in depressed the groove. Such a deformation is, for example allows if the profile element made of foam rubber is.

Both the above-mentioned, cross-sectionally oval profile element as well as possible others, such as in a round triangular or rectangular groove Profile elements can also be made from a thin-walled flexible Plastic hose to be formed.

In addition, it is possible to make the profile element from one less flexible plastic or metal. So the profile element in the groove with respect to one direction be resiliently mounted away from the sealing tape. A Possibility to do this arises when the seated in the groove Section of the profile element spring means provided are. These spring means can be both a variety of spaced apart from one another over the length of the profile element, individual springs in the groove, such as knobs or the like. However, it is advantageous if the Spring means supported on the groove, on the profile element provided legs are. Form these legs lips running the entire length of the profile element, the feathers can. A little is enough permissible spring stroke of the legs when the spring movement the leg through sloping surfaces in a corresponding Movement of the profile element in the groove or out of the groove is implemented out. This can be achieved by the legs rest on contact surfaces provided in the groove, the one angle opening on the flank include, with the legs resilient in the direction of expansion are biased. This profile element can consist of both Plastic as well as be made of metal.

Finally, the profile element can be used as a resilient tongue or lip formed locking section, the is arranged between the flank and the sealing tape and connected to the portion seated in the groove is. The spring action required for locking is in mainly caused by a deformation of the tongue. The tongue has contact surfaces that with corresponding wedge surfaces provided on the sealing strip to be in contact. The inclination of touch and Wedge surfaces in relation to the flank of the longitudinal slot determines the for the snap in and out of the sealing tape required force. Thus, by suitable Determination of the inclination of the contact and wedge surfaces Detent force for engaging and disengaging separately can be set.

Two grooves can also be used to fasten the profile element be provided, which run parallel to each other and in which the profile element with corresponding sections sits. The grooves can be either triangular or rectangular be, as well as open edge grooves on the edges of the Flank of the longitudinal slot may be provided. In any case results the possibility of a secure, form-fitting Fixing the profile element in the longitudinal slot.

It is particularly advantageous if the profile element Flanks completely covered. In this case, these are through the Profile element protected. For example, the Web when it is pressed by lateral pressure on the profile element the flanks are not pressed. The profile element forms thus a tarnish protection for the flanks. This tarnish protection can already be ensured that the profile element at least one stationary on the Has flank adjacent section, based on the remaining edge is raised. Even if the flank is not quite is covered, but provides the provided on the profile element Section ensure that the footbridge is not covered Parts of the flank cannot touch. That makes reliable tarnish protection.

Fig. 1

einen kolbenstangenlosen Linearantrieb mit einem von einem Profilelement gehaltenen Dichtungsband in Seitenansicht und in einer teilweise aufgebrochenen und schematisierten Darstellung,

Fig. 2

den Linearzylinder nach Fig. 1 in Schnittdarstellung geschnitten entlang der Linie II-II,

Fig. 3

den Linearantrieb nach Fig. 2 mit im Bereiche seines Längsschlitzes vorgesehenen Profilelementen in zwei unterschiedlichen Ausführungsformen, in ausschnittsweiser Darstellung und in vergrößertem Maßstab,

Fig. 4

den Linearantrieb nach Fig. 2 mit im Bereiche seines Längsschlitzes angeordneten Profilelementen in zwei weiteren Ausführungsformen,

Fig. 5

den Linearantrieb nach Fig. 2 mit im Bereiche seines Längsschlitzes angeordneten Profilelementen in zwei weiteren Ausführungsformen,

Fig. 6

den Linearantrieb nach Fig. 2, bei dem der Längsschlitz in seinen Flanken zwei Nuten aufweist, in denen ein die Flanke abdeckendes Profilelement gehalten ist, in zwei Ausführungsformen und in einer ausschnittsweisen schematisierten Darstellung,

Fig. 7

den Linearantrieb nach Fig. 2, bei dem das in einer Nut sitzende Profilelement eine federnde Zunge zur Halterung des Dichtungsbandes aufweist, in zwei Ausführungsformen und in ausschnittsweiser schematisierter Darstellung,

Fig. 8

den Linearantrieb nach Fig. 2, bei dem das in einer Nut sitzende Profilelement eine federnde Zunge zur Halterung des Dichtungsbandes aufweist, in zwei Ausführungsformen und in ausschnittsweiser schematisierter Darstellung,

Fig. 9

den Linearantrieb nach Fig. 2, bei dem das Profilelement in zwei parallel zueinander verlaufenden Nuten gehalten ist, und

Fig. 10

den Linearantrieb nach Fig. 2, bei dem das in zwei zueinander parallelen Nuten sitzende Profilelement die Flanke des Längsschlitzes ganz abdeckt, in zwei Ausführungsformen, wobei bei einer Ausführungsform eine zusätzliche, als Labyrinthdichtung ausgeführte Abdichtung vorgesehen ist.

Exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it:

Fig. 1

a rodless linear drive with a sealing strip held by a profile element in side view and in a partially broken open and schematic representation,

Fig. 2

1 in a sectional view along the line II-II,

Fig. 3

2 with profile elements provided in the area of its longitudinal slot in two different embodiments, in a sectional representation and on an enlarged scale,

Fig. 4

2 with profile elements arranged in the region of its longitudinal slot in two further embodiments,

Fig. 5

2 with profile elements arranged in the region of its longitudinal slot in two further embodiments,

Fig. 6

2, in which the longitudinal slot has two grooves in its flanks, in which a profile element covering the flank is held, in two embodiments and in a partial schematic representation,

Fig. 7

2, in which the profile element seated in a groove has a resilient tongue for holding the sealing tape, in two embodiments and in a partial schematic representation,

Fig. 8

2, in which the profile element seated in a groove has a resilient tongue for holding the sealing tape, in two embodiments and in a partial schematic representation,

Fig. 9

2, in which the profile element is held in two mutually parallel grooves, and

Fig. 10

2, in which the profile element seated in two mutually parallel grooves completely covers the flank of the longitudinal slot, in two embodiments, one embodiment providing an additional seal designed as a labyrinth seal.

The linear drive module shown in Fig. 1 is a rodless linear drive 1, which is a guide tube 2 has, in which a sealed against its wall 3 Piston 4 is slidably mounted. The guide tube 2 is closed at the ends with covers 5, 6, so that the piston 4 with its end faces 7, 8, the Wall 3 and the covers 5 two chambers 9, 10 limited, which can be acted upon with pressure medium, such as compressed air are.

The guide tube 2 is parallel to one another Longitudinal axis 11 extending through the wall 3 Long slot 12 provided by two each other opposing ones running parallel to each other at a distance Flanks 13, 14 is limited, in particular from 2 and the following figures.

The longitudinal slot 12 is at the end of the covers 5, 6 held sealing tape 16 closed by means of one lying against the wall 3 of the guide tube 2 Sealing lip 17, the chambers 9, 10 in the longitudinal slot 12 seals. The curvature of the sealing lip 17 is correct inside with the curvature of the wall 3 so that the piston 4 on the sealing lip 17 as on the rest of the wall 3 sits sealed. In a middle area of the Piston 4 is the sealing tape 16 from a guide device 18 pulled from the longitudinal slot 12 inwards. As can be seen from Fig. 2, is in this area forked web 19 is provided, the piston 4 with a connects external output 20 and through its fork Sealing tape 16 is performed.

In Fig. 3 are two possible and in terms of training of the longitudinal slot 12 and the sealing tape 16 different Embodiments of the linear drive 1 in Cutout shown. 3, as in the rest of the following figures the left half of the Fig. An embodiment and in the another embodiment is shown on the right half of the figure. All embodiments have in common that in each flank 13, 14 a groove 22 is provided, in which a Profile element 24 is held. In all embodiments is the cross section of those provided in the flank 13 Groove 22 with the cross section in the opposite Flank 14 provided groove 22 match.

To enable a clear reference, are functionally identical parts and sections on different Embodiments of the linear drive 1 with the same reference numerals Mistake.

In the embodiment shown in Fig. 3 left Linear drive 1 is the groove provided in the flank 13 22 rectangular. It has two parallel ones Side walls 23, between which the cross section oval profile element 24 is held. The profile element 24 is made of a flexible foam rubber and has a locking section projecting into the longitudinal slot 12 25 on, in cross-section essentially in the form of a circular section is.

That with a substantially rectangular section 26 in the longitudinal slot 12 lying sealing tape 16 instructs its side 27 lying on the flank 13 has a longitudinal recess 28 on, in its cross section with the cross section of section 26 matches and thus also is circular.

In the linear drive 1 described so far is by the profile element 24 lying in the longitudinal recess 28 a snap connection between the sealing tape 16 and the Guide tube trained. That outside of the piston 4 occupied area is lying sealing tape 16 thus held so far in the longitudinal slot 12 that the Sealing lip 17 abuts the wall 3 and the chambers 9, 10 are thus tight.

In addition, the profile element 24 provides a certain Side tarnish protection. The locking section 25 thus acts at the same time as a start-up section 30, which prevents the web from to slide along the flank 13 and damage it. However, the protective effect is at least one consistently flat web rather low and dependent on the spring action of the profile element 24. For The web 19 can be reinforced with the side tarnish protection one lying at the same height as the profile element 24 Be provided projection, which is on the locking portion 25th the profile element 24 supports.

The one shown in Fig. 3 on the right half of the picture Section of the linear drive 1, the groove 22 is nearby their mouth 31 formed with parallel flanks, being following the parallel flanked section of the mouth 31 initially widened away and then narrowed again. Portions of the side walls 23 thus form one another opposite contact surfaces 32, 33, which have a pointed, opening towards the mouth 31 with each other lock in.

In this groove 22, the profile element 24 is inserted, the Locking section 25 is trapezoidal here. On the one in the Groove 22 seated section of this profile element 24 two enclosing an acute angle Legs 36, 37 are provided, which are resilient and on the corresponding contact surfaces 32, 33 of the groove 22 issue.

The profile element 24 is made of a resilient plastic made so that the legs 36, 37 when inserted spring the profile element 24 into the groove 22, and that Profile element 24 to its rest position shown in Fig. 3 preload too springy.

Corresponding to the cross-sectional shape of the latching section 25 is the longitudinal recess provided in the sealing band 16 28 in this embodiment of the profile element in Correspondence with the trapezoidal locking section 25 also trapezoidal.

In this embodiment described so far, the Snap action between the guide tube 2 and the sealing tape 16 also by the action of the profile element 24 ensured. In contrast to the one described above Exemplary embodiment is that serving as a locking member Profile element 24, however, not in the latching process whole, but essentially only in his Legs 36, 37 deformed. The extent of the deformation is also less, so that a plastic with less Compliance can be used. Moreover this profile element 24 also offers side tarnish protection. This is especially the case if the web is with a lateral, which is supported on the profile element 24 Longitudinal rib is provided. At the latest when that Profile element 24 is pressed completely into the groove 22, so that the legs 36, 37 rest on the bottom, that is Profile element 24 a fixed abutment for the web 19th

In the linear drive 1 shown on the left in FIG. 4 has that sitting in a trapezoidal groove 22 here Profile element 24 a separate from the locking portion 25 Start section 30. The locking section 25 is there a resilient tongue formed on the profile element 24 or lip 41 towards the sealing tape 16 protrudes with a slight inclination against the flank 13. In cooperation with the longitudinal recess 28 which in this Embodiment is relatively deep, is therefore a snap connection trained, due to the low inclination the lip 41 against the flank 13 with the sealing tape 16 low force can be inserted into the longitudinal slot 12. As soon as the lip 41 is in the longitudinal recess 28, that is Sealing tape 16 firmly locked in the longitudinal slot 12, so that to lead out the sealing tape 16 from the Longitudinal slot 12 requires a greater force.

The separate start-up section 30 lies on a somewhat recessed Area of edge 13 and is in the Longitudinal slot 12 in front. It is dimensioned so that it is the section 26 of the sealing tape 16 is present.

In this embodiment, the profile element 24 a particularly good tarnish protection is ensured. The jetty 19 lies down when it is subjected to a lateral force at the start-up section 30 or more precisely its contact surface 42, which is substantially parallel to the flank 13 is arranged. Because the contact surface 42, based on the flank 13, and the profile element 24 overall, but in particular in the start section 30 is made of relatively stiff material, the on the contact surface 42 adjacent web 19 do not touch the flank 13. This is effectively protected against damage.

The sealing tape 16 is on the piston 4 facing Inside straight, i.e. plan trained. That is why it from the piston passing under the sealing band 16 slightly deformed, i.e. pushed outwards. The The inside of the sealing tape 16 takes on the curvature of the piston 4. A corresponding freedom of movement ensure the longitudinal recess 28 is relatively large dimensioned.

The embodiment shown on the right in Fig. 4 Linear drive 1 largely corresponds to that on the left in FIG. 3 shown. The difference is that the profile element 24 a substantially round cross section and the groove 22 has a square cross section. About that in addition, the recess 28 is much larger, so that the sealing tape 16 only at rest with one Edge 43 abuts the profile element 24. The Sealing tape 16 is also here, as in the above described embodiment, on its inside evenly, so that it is slightly behind by the passing piston 4 is pressed outside. The longitudinal recess 28 grants a corresponding freedom of movement of the sealing tape 16.

A side protection, albeit a less pronounced one, is also ensured in this embodiment, if on the web 19 one with the profile element 24 interacting, i.e. provided on this rib is.

In the linear drive 1 shown on the left in FIG a profile element 24 used, which both have a good locking effect as well as ensuring good tarnish protection. The section 26 lying in the groove 22 is in the direction the surface normal of the flank 13 is slidably mounted. The latching section 25 is in the form of a circular section and lies in the correspondingly shaped longitudinal recess 28. From the Locking section 25 extends from the resiliently formed Starting section 30 from the groove 22 via the to the groove 22 adjacent section of the flank 13 and covers this from. The one standing obliquely away from section 26 in the rest position Starting section 30 is supported on the flank 13 from and presses the locking portion 25 in the direction of Sealing tape 16, so that the locking section 25 firmly in the longitudinal recess 28 is.

The sealing tape 16 is engaged and disengaged in similar to that of the above-described embodiments. It is also through the startup section 30 protection of the flank 13 against damage by the Web 19 ensured when this towards the edge 13 is pressed. This is especially the case if that Profile element made of a tough and wear-resistant plastic is made.

In the embodiment shown on the right in FIG. 5 the groove 22 is provided with undercuts. In detail the groove 22 has two parallel at a relatively large distance mutually extending side walls, in which again mutually opposite grooves 22a, 22b each with rectangular cross-section are introduced. The grooves 22a, 22b form a roof-like floor with their side surfaces 44 of the groove 22. The bottom 44 has two sections on that blunt in an opening opening away from the groove 22 Angle to each other. At these sections of the Bottom 44 is supported by the profile element 24, which is in the idle state is a U-shaped strip. This lies with his legs in the grooves 22a, 22b, causing him to spread is. The profile element 24 consists of a flexible Material such as plastic or a resilient metal strip. Because of its spring action the profile element 24 is somewhat from the mouth 31 of the groove 22 pushed out so that it with its locking portion 25th protrudes from this.

In this embodiment, too, there is a latching effect between the sealing tape 16 and the guide tube 2 and a tarnish protection as in the above-described embodiments reached.

6 shows further exemplary embodiments, being in the embodiment shown on the left in addition to the groove 22, a second groove 45 open to the edge is provided on the opposite of the groove 22 Side of the edge 13 is arranged. The profile element 24 has two sections 26, 46 lying in the grooves 22, 45 on through the startup section 30 with each other are elastically connected. The startup section 30 covers the entire flank 13. In the idle state, the Section 26 with the starting section 30 a blunt and the section 46 lying in the edge-open groove 45 with the starting section 30 with each other an acute angle on. As a result, the run-up section 30 is at the edge-open Groove 45 in the direction of the sealing tape 16 elastically in front, at the same time forming the latching section 25.

The side 27 of the sealing tape 16 is against the flank 13 inclined and goes along with the run-up section 30 a step 47 to a larger width. The inclined Page 27 and step 47 together limit the longitudinal recess 28, in which the start-up section 30 lies.

Because of the complete coverage of the edge 13 by the Startup section 30 turns on in this embodiment particularly good tarnish protection achieved.

In addition, for example to seal the To improve sealing tape on the contact surface 42 of the Starting section a longitudinal, in cross section semicircular rib 48 may be provided in a corresponding, provided in the side 27 of the sealing tape 16 Longitudinal groove 49 lies.

The embodiment shown on the right in FIG. 6 is correct largely corresponds to the one shown on the left, whereby the Page 27 of the sealing tape 16, however, parallel to the Flank 13 of the longitudinal slot 12 runs. Outwardly closes the sealing tape 16 smoothly with the guide tube 2 and the section 46 lying in the edge-open groove 45 of the profile element 24. The locking effect is here in essentially by the interaction of the rib 48 with the Longitudinal groove 49 caused.

The linear drive 1 shown on the left in FIG. 7 is included 5 largely identical in construction to that shown in FIG. 5, wherein the start-up section 30 lies flat against the flank 13. The otherwise defining an angle profile in cross section Profile element 24 is in the rectangular groove 22 held in a form-fitting manner and with respect to the guide tube 2 essentially stationary. The locking effect is due to the here very short trained locking lip 42, which with a locking lug 50 in the in the sealing tape 16th provided longitudinal groove 49 is.

Because of the almost complete coverage of the flank 13 through the profile element 24 is a good tarnish protection reached, the achievable locking effect by a corresponding Interpretation of the lip 41 is variable.

In the linear drive 1 shown on the right in FIG on the profile element lying in the rectangular groove 22 24 a spiral spring 51 is formed, the first leg 52 fits snugly against the somewhat recessed flank 13 and the other leg formed by the lip 41 is that with the leg 52 on the outside of the linear drive 1 is continuously connected.

Others, both a tarnish protection and a locking function ensuring embodiments of the linear drive 1 are shown in Fig. 8. The profile element 24 lies in the groove 22 which is triangular in cross section here in which the also triangular section 26 sits. This can, as shown, fully trained, as well be provided with a longitudinal groove that the elasticity of the Section 26 increased. The start-up section 30 and the lip 41 are here on opposite sides of the Section 26 arranged.

However, the lip 41 can also, as is right in FIG. 8 is shown, directly with the starting section 30 be elastically connected.

Another embodiment is in the left half of the Fig. 9 shown. Here is the edge-open groove 45 on hers to the flank 13 bordering side with a longitudinal Provide projection 53 so that, from the Seen longitudinal slot 12 forth, an undercut in the groove 45 results. The profile element 24 lies in both Grooves 22, 45 and aligned with both the outside of the Guide tube 2 as well as with the outer side of the sealing tape 16. From the stationary through the grooves 22, 45 held section of the profile element extends the Lip or tongue 41 in the direction of the piston 4 in approximately radial direction. The lip 41 is not in contact the flank 13, but stands by this in the longitudinal slot 12th

The lip 41 is on the end with the entire Length extending latch 50 provided in the here groove-shaped longitudinal recess 28 is located, whereby the Sealing tape 16 is locked to the guide tube 2. The Tarnish protection is here by the between the grooves 22, 45 extending start section 30 ensured.

The linear drive 1 shown on the right in FIG. 9 is correct largely corresponds to the one shown on the left, whereby on the undercut in the open groove 45 is dispensed with has been. In addition, the flexible lip 41 is curved trained so that they are with their free end on the Edge 13 supports. It is arched into the longitudinal slot 12, this above section being about circular section-shaped locking section 25 forms.

In the embodiments of the Linear drive 1 is by an undercut in the edge-open groove 45 a particularly secure attachment of the Profile element 24 ensured. In both embodiments is the groove 22 also as an open edge groove educated. Of the section of the lying in the groove 45 Profile element 24 extends the resiliently formed Run-up section 30 in the direction of the groove 22 which is open at the edge, in which he engages with a short section. The startup section 30 is resiliently biased away from the flank 13, so that for the trapezoidal, in the longitudinal slot section of the sealing tape 16 results in a locking effect. It also provides good tarnish protection reached.

In the linear drive 1 shown on the right in FIG. 10 has the profile element 24 on the lying in the groove 45 Section 46 a sealing groove 60 open to the outside on. The sealing groove 60 forms with a on a masking tape 61 or a slide provided a labyrinth seal. This will be an additional improvement Sealing of the linear drive 1 reached.

The profile element 24 can be in any of its embodiments as an anti-louse element both on pressure fluid operated Linear drives 1 and on such linear drives can be used via traction mechanism, screw spindle gear or racks are driven.

Claims (21)

1. Linear drive

   with a guide tube (2) which has a longitudinal slot (12) leading through its wall and in which a piston (4) is mounted so as to be movable in the longitudinal direction,

   with at least one closure arrangement (5, 6) which closes off the guide tube (2) at the end,

   with a web (19) which forms a power take-off (20), connected to the piston (4) and passes through the longitudinal slot (12),

   with a sealing strip (16) which seals the longitudinal slot (12) at least in regions (9, 10) which are under pressure, the said sealing strip being held stationary at the end relative to the guide tube (2) and having at least one portion resting in the longitudinal slot (12),
   characterised in that

   at least one separate profile element (24) is provided which is disposed in the longitudinal slot (12),

   extends essentially along the longitudinal extent of at least one flank (13) of the longitudinal slot (12) and

   is positively connected to the sealing strip (16) in such a way that

   a latching connection is formed between the sealing strip (16) and the guide tube (2).
2. Linear drive as claimed in Claim 1, characterised in that the profile element (24) is positively held in the longitudinal slot (12).
3. Linear drive as claimed in Claim 1, characterised in that the longitudinal slot (12) is provided for fixing of the profile element (24) on its flank (13) with at least one groove (22) in which the profile element (24) rests with a portion (26).
4. Linear drive as claimed in Claim 1, characterised in that in at least one face (27) of the sealing strip (16) facing the flank (13) of the longitudinal slot (12) a longitudinal recess (28) is provided which extends over the entire length of the sealing strip (16).
5. Linear drive as claimed in Claim 4, characterised in that the profile element (24) has a latching portion (25) extending into the longitudinal recess (28).
6. Linear drive as claimed in Claim 4, characterised in that the latching portion (25) is held resiliently in the direction towards the flank (13).
7. Linear drive as claimed in Claim 1, characterised in that the profile element (24) has an oval cross-section.
8. Linear drive as claimed in Claim 3, characterised in that the groove (22) has a rectangular cross-section.
9. Linear drive as claimed in Claim 7 and 8, characterised in that the profile element (24) rests with its flat faces on side walls (23) of the groove (22) which are parallel to one another and projects with its round latching portion (25) into the longitudinal slot (12).
10. Linear drive as claimed in Claim 1, characterised in that the profile element (24) is made from foam rubber.
11. Linear drive as claimed in Claim 1, characterised in that the profile element (24) is a thin-walled flexible plastic hose.
12. Linear drive as claimed in Claim 1, characterised in that the profile element (24) is held by self-substance retention on the flank (13).
13. Linear drive as claimed in Claim 3, characterised in that the profile element (24) is mounted in the groove (22) so that it is resilient relative to a direction away from the sealing strip (16).
14. Linear drive as claimed in Claim 3, characterised in that spring means (36, 37) are provided on the portion (26) of the profile element (24) resting in the groove (22).
15. Linear drive as claimed in Claim 14, characterised in that the spring means (36, 37) are legs (36, 37) which are provided on the profile element (24) and are supported on the groove (22).
16. Linear drive as claimed in Claim 15, characterised in that the legs (36, 37) extend over the entire length of the profile element (24).
17. Linear drive as claimed in Claim 15, characterised in that the legs (36, 37) rest on contact surfaces (32, 33) provided in the groove (22) which enclose an angle to be opened on the flank (13), the legs (32, 33) being resiliently initially tensioned in the expansion direction.
18. Linear drive as claimed in Claim 3, characterised in that the profile element (24) has a latching portion (25) which is constructed as a tongue or lip (41), is disposed between the flank (13) and the sealing strip (16) and is connected to the portion (26) resting in the groove (22).
19. Linear drive as claimed in Claim 1, characterised in that for the profile element (24) two grooves (22, 45) are provided in which the profile element (24) rests with corresponding portions (26, 46).
20. Linear drive as claimed in Claim 1, characterised in that the profile element (24) completely covers the flank (13).
21. Linear drive as claimed in Claim 1, characterised in that the profile element (24) has at least one portion (30) which rests stationary on the flank (13) and is raised relative to the flank (13).

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