EP0730932B1 - Belt tensioner - Google Patents

Abstract

The belt tensioner mechanism has its belt (22) wrapped around two workpieces (24,26) whose edges are protected by protection pieces fixed to the belt. The handle (20) of the mechanism is connected to a pressure plate (18) via a spindle (16) which moves it from its zero position so that it clamps the belt sides (25,26) between it and the upper part of the body (14) of the device. The belt passes into the tensioning mechanism through channels and goes through curved sections (30,32) which produce a double pulley effect when the free end of the belt is pulled in a downwards direction (23).

Description

The invention relates to a strap tensioner with a strap, which is used to wrap one or more workpieces forms an outer loop with a tensioning device, relative to which a first end of the loop can be fixed, by means of which is the outer loop for clamping the workpiece or of the workpieces is contractible and which one on the Loop with a loop element supported base element as well as a tension element, with an adjusting device, by means of which the tension element and the basic element are movable relative to each other, with a relative movement the outer loop of the basic element and tension element is contractible under the action of a pulley.

Such a belt tensioner according to the preamble of independent claim 1 is known from US 3,584,860 and is used for reclamping workpieces of various types Forms, whereby a tensioning of the tape according to the principle of a simple pulley.

In an embodiment of a known from EP-0 302 806 Belt tensioners, the tensioning device is designed so that it pulls on both ends of the outer loop, which as Tension tape used textile tape when tensioning on two rollers is wound up. However, this solution has the disadvantage that due to the different circumferential dimensions when winding uneven pulling of the tension band on the rollers on both sides of the outer loop.

In addition, the handling of the tensioning device disadvantageous via a single rotary knob, which in several Positions has different functions. A position serves for free pulling out of the tensioning strap, one for quick Winding up the strap and a third position for Tension the strap in small rest positions.

Such belt tensioners are particularly suitable for holding together bulky parts or parts with interrupted peripheral surfaces, such as B. backrests or feet. To the misshapen parts also include pillars, kidney-shaped furniture or oval-round workpieces.

With such tape tensioners, normal frames can also be used Square, hexagonal or octagonal shape.

It is particularly advantageous for such belt tensioners better and more gentle clamping of workpieces with corners in the Area of the corners additional corner elements - or also span corners called - to use.

Belt tensioners come in a wide variety of designs known.

For example, belt tensioners are known, in which a Lashing strap with ratchet is used. Other embodiments of tape tensioners use a spindle with Spindle nut for operating the tape guide. With these Solutions are required, however, the two hinge sides or tape ends, holding the Band depends on how good the clamping is.

If textile straps are used as tensioning straps, so is their large stretch disadvantageous, which is particularly the case with a large Extension of the sling noticeable. For this reason metal straps are also used in strap tensioners, these However, they have the disadvantage that they are difficult to handle are and jump up.

The invention is therefore based on the object Belt tensioner of the generic type to improve such that this can be handled as advantageously as possible.

This task is the beginning of a belt tensioner described type according to the invention solved in that the Loop thus runs between the base element and the tension element and attacks this, that with a relative movement of the base element and tension element the outer loop under Effect of a double pulley is contractible, that the size of the sling is variable and that a second end the loop on the tensioning device by means of a fixing device is fixable.

The advantage of the solution according to the invention can be seen in that even with a simple relative movement between Traction element and basic element as fast as possible and efficient shrinking of the outer loop and thus Tensioning due to the double pulley effect during the relative movement from basic element to tensile element.

In addition, the belt tensioner according to the invention is simple can be actuated because only to pull the outer loop together a relative movement between the basic element and tension element can be carried out by means of the adjusting device.

According to the invention, the size the sling can be varied to fit different To be able to create workpieces, for easy variation the size of the loop is provided with a fixing device, with which the two ends can be fixed in the clamping device are.

The effect of a double block and tackle can be varied Guides of the sling between the basic element and reach the tension element.

A particularly advantageous embodiment due to its simplicity provides that the noose with a first Place on the basic element and with at least two more Places on the traction element is attacking.

It is particularly useful if the loop is two Loops forms, the bends the two other places form with which the loop abuts the tension element. With these two loops the is easy Effect of the double pulley can be represented, preferably one end of each loop at each end The loop lies and at the other end of the loop the strap continues to the outer loop.

This can be achieved, for example, in that a separate adjustment device at any point on the Loop works to vary its size.

A particularly simple embodiment of the invention Belt tensioners provide that a first end of the Loop arranged at a fixed point on the strap is and that the strap is over a second end the noose continues as a strap reserve and that the size of the sling by reducing or enlarging the Tension strap reserve is variable, the size of the sling by exact positioning of the first end relative to the second end is definable.

This solution creates easier and also for an operator slightly transparent way the possibility of Vary the size of the sling.

For example, the first and second ends of the loop could be arranged on a separate locking device which is used to vary the size of the sling.

However, it is particularly advantageous if the first end and engage the second end of the sling on the tensioner.

For example, it would be possible to have the first end in the jig to be determined independently of the fixing device.

A particularly useful solution, however, provides that the first end and the second end in the fixing device of the Clamping device can be fixed so that the tensile force on one End of the noose immediately to the other end of the Noose works.

To fix the strap in any position To enable the fixing device is preferably provided that the fixing device non-positively on the Strap works.

In this case, it is particularly advantageous if both first end as well as the second end of the noose in the Fixing device can be fixed, since then the fixing device affects both ends and, for example, both ends presses against each other, which is particularly the case with one braided or textile strap due to the high surface friction leads to the fact that in the fixing device both ends immediately due to the friction between them are fixed relative to each other.

The fixing device can be of various types and Be done wisely. An advantageous embodiment of the Fixing device provides that this is a fixing element and has an abutment between which the strap can be clamped is.

For clamping the strap between the fixing element and the abutment can in principle be a separate actuating device, for example, provided with a toggle mechanism his.

A particularly easy to use solution provides that the fixing device and the adjusting device at the same time, in particular by means of the same actuating element, can be operated, so that in addition to easy handling it is also ensured that when actuating the adjusting device for tensioning the strap Fixing device in the sense of defining at least one End of the loop is actuated.

A solution in which the Actuation of the fixing device necessarily takes place when the adjustment device in the sense of tensioning the strap is operated.

A particularly advantageous embodiment of the invention Solution, however, provides that the fixing element when moving the base element and the tension element relative can be actuated relative to one another by the adjusting device.

In the simplest case it is provided that the adjusting device via the fixing device on the base element supports and thus the fixing device at least that second end of the loop and possibly also the first Fixed end relative to the basic element.

In this case, it is particularly advantageous if that of the Fixing device fixed one end of the loop with which the sling engages the base element is present.

Regarding the effect of the tension element on the sling were in connection with the previous explanation of individual exemplary embodiments made no further details. So an advantageous embodiment provides that the Tension element has two tensile bodies, one of which each in one of the at least two other places on the Noose works.

The tension members are preferably on both sides of the adjusting device arranged on the tension element.

Regarding the adjustment device have been related with the previous explanation of the individual embodiments no details given. So is as an adjustment device any type of actuator conceivable, which one Relative movement between the basic element and tension element generated.

One because of its simplicity in construction and the simple operability, particularly inexpensive adjustment device, with which high forces can also be generated, comprises a spindle and a spindle nut running on the spindle.

Such a spindle has the advantage that it is easier Operability is able to a relatively large distances generate high power, which is particularly the case here Case in which the relative movement between the tension element and Basic element of a double pulley system on the outside Has noose that matters.

Such an adjustment device can be used in many different ways Now on the basic element and the tension element Act. A structurally particularly cheap and simple Embodiment provides that the spindle nut on the tension element is held and the spindle on the base element supports.

In the simplest case, it is provided that the Spindle with one spindle end on the fixing element of the Fixing device supports.

Relatively rotatably relative to the tension element carrying the spindle nut leading to the adjusting spindle is preferably provided that the tension element is connected to the base element Linear guide in the direction of this and away from it movable, but is non-rotatably guided.

This linear guide could be of various types and Be trained. An advantageous training of Linear guide provides that this part of a housing, preferably formed by walls of the same, on which in particular the basic element is held.

In the simplest case, it is provided that the basic element Part, preferably a bottom part, of the housing forms.

So far, with regard to the formation of the basic element none with regard to the formation of the loop passage details given. For example, it would be conceivable to provide a single opening in the base element through which the loop is passed to the tension element. Especially However, it is advantageous if the basic element has two guide openings for each strand of the loop.

The guide openings are preferably laid in such a way that that the respective run of the sling after the each loop formed between the base element and tension element extends through the respective guide opening.

Regarding the way in which the strap reserve or should be arranged in the clamping device No details have been given so far. Basically it would be possible, the tension band reserve simply falling freely from the Let jig run out or a cavity to be provided in which the strap reserve can be stored in an unordered manner is.

However, sees a particularly advantageous embodiment before that the tensioning device a carrier for the strap reserve has, on which in particular the strap reserve can be filed in an orderly manner.

This carrier is preferably used as a winding body for the Strap reserve formed, on which thus the Can wind up the strap reserve in an orderly manner.

The winding body could on the one hand through the housing itself be formed so that the strap reserve is easy can wind the winding body formed by the housing.

However, it is even more advantageous if the winding body is a forms rotatable coil relative to the housing on which the Tension band reserve can be wound up in the form of a wrap.

The spool is preferably with a crank for winding of the strap reserve rotatable.

With regard to the loading of the workpieces by the outer sling of the tension band were associated with the previous explanation of the individual exemplary embodiments no details given.

So an advantageous solution provides that the outer Loop for loading the workpieces with corner elements is provided.

These corner elements could, for example, be used for the workpieces wrapping the outer loop freely between Strap and the respective workpieces can be inserted. This has the disadvantage, however, that it is easy to use of the belt tensioner according to the invention is no longer possible.

For this reason it is preferably provided that the corner elements are captively fixable on the strap.

The corner elements are preferably used for fixing to the strap provided with holding elements acting on the strap, who are trained in a variety of ways could be.

A particularly advantageous embodiment provides that the holding elements are designed so that the strap is transverse to its longitudinal direction in one through the holding elements fixed position on the corner elements can be inserted, so that there is no need to close the outer loop open and for example the strap through this lead through all around.

The holding elements are preferably designed so that the strap from one side edge to a flat side spread.

To additionally prevent the strap from sliding out of the securing each holding element is expedient another securing element is provided, which the strap secures against sliding out of the holding element. This In the simplest case, the securing element can be a nose which the tensioning strap lies on with the side edge which is not overlapped by the holding element.

It is particularly useful if the securing element also represents a holding element and thus the two holding elements of mutually opposite side edges starting from the tensioning strap.

The corner elements can be used in many different ways be trained.

To make sure that with these different angles corners of workpieces can be overlapped, it is preferably provided that the corner elements have a cavity Grasp in a U-shape and end of the leg of the U Have pressure lugs with which the corner elements on the Workpieces work. For example, the corner elements are included so that it can be placed on the corners of workpieces so that the pressure lugs rest on opposite sides of the corners.

The corner elements can be designed so that they with their pressure noses act directly on the workpiece. Yet However, it is more advantageous if the corner elements in the area their pressure lugs with pivoted on these pressure parts are provided, which in turn have printing areas, with which the printed parts act on the workpiece.

For example, the printed parts are flat or slightly curved printing surfaces.

Preferably, the corner elements are designed so that the tensioning band across the full length of the latter rests in order to achieve the best possible pressure effect.

In addition, the corner elements are also preferably so trained that the pressure tabs symmetrical to a center line of the strap are arranged.

In addition, the pressure parts are preferably designed such that it is symmetrical to a central plane of the Stretch strap.

A particularly advantageous embodiment of the invention Band tensioner provides that this for the Clamping workpieces of symmetrical and shapeless Shape with textile tape and several instep areas to be underlaid to protect the workpieces and for better sliding of the Tensioning strap along this when tensioning by means of a usual clamping element within a clamping device or a Tensioning device is formed, the tensioning strap inside of the tensioning device or the tensioning device in tensioning channels of deflection corners - or also called tensile elements - is performed so that the effect of a double Pulley results and preferably with a tensioning Spindle between a pressure plate and the two sides of the strap are clamped to the surrounding housing become.

It is even more advantageous if the tensioning device in this solution - or the tensioning device - from the tape guide, the Housing of the clamping device and the clamping element and the There is a strap, the housing the strap guide in such a way encloses that there is an exact guidance for the tape, the no evasion allowed.

Another advantageous variant of the invention Solution provides that two through openings in the housing are present on the workpiece exit side, through which the band on a radius when tensioning inwards is pulled.

Another cheap variant provides that the tape guide Has band channels for redirecting to the depth of the bandwidth and to facilitate marking when necessary firmly manufactured preferably as an injection molded part made of plastic Part are attached to the open side.

Furthermore, in the solution according to the invention, it is expedient when guiding the tape in the tape guide like this it is done that the end, which is attached to the fixed point, and the opposite side, which is pulled in and out, between the pressure plate and the top of the housing can. The harder it is stretched over the spindle, the tighter hold the straps.

Alternatively, it is advantageous if for the printing plate a recess is provided to by turning back Relieve the tension straps completely for better pulling through to be able to.

Another expedient solution within the scope of the invention provides before that a mark is made on the outside of the case which indicates the direction of extension and retraction.

Cams are preferably attached to the housing for winding serve the tape when storing the tensioning device, and a slot to secure the tape.

Another expedient solution according to the invention provides that the tensioning device or the tensioning device additionally with two or more corner elements or corners to protect the Workpiece edges is equipped and for better sliding of the Tension band around these edges, these for edges or Miter angles from 45 to 120 ° can be used continuously and captive on the strap afterwards are mountable.

The clamping corner or the corner element is preferably in one piece made from an open cylindrical shape, the Opening is set so that acute angles and obtuse angles have space in the inner cavity of the hollow cylinder.

It is also expediently provided that the tape guide in a slot that is open at the top and after has an approach at the bottom and an introductory slope at the top and a cam on both sides.

This cam is expediently formed on the cylinder and has an insertion bevel with a barb functioning Approach to tape backup. The approach lies thereby deeper than the slot drain.

Furthermore, it is advantageous if for better investment on Workpieces with clamping surfaces on a cylindrical, a diameter section of the Clamping corners are clipped on.

An advantageous embodiment of an inventive Belt tensioner creates the possibility with the simplest ease of use quickly after gripping the workpiece to high Resilience to come.

Furthermore, the belt tensioner is a compact device with and output trained.

To operate this belt tensioner with a general be known clamping element.

The belt tensioner is also preferably equipped with Protective or clamping corners for the most common miter angles.

When tensioning, the tensioning strap should be drawn in evenly on both sides become. The span corners should be stepless for miter angles or spanned corners from 45 to 120 ° can be used can adapt to the manufactured angle and easily resilient. They should be attached to the tape as required can without being unwound or unwound need to quickly switch to clamping with or without Span corners. They should also be captive on the strap hold tight. For storage, it is advantageous that Being able to wind up the strap and the protective corners cannot be lost to attach to the jig.

Fig. 1

eine Gesamtdarstellung eines ersten Ausführungsbeispiels eines erfindungsgemäßen Bandspanners;

Fig. 2

eine Darstellung einer Spannvorrichtung des ersten Ausführungsbeispiels des erfindungsgemäßen Bandspanners mit teilweise aufgebrochenem Gehäuse;

Fig. 3

einen Schnitt durch einen Teilbereich der Spannvorrichtung längs Linie 3-3 in Fig. 2;

Fig. 4

eine Draufsicht auf die Spannvorrichtung in Richtung des Pfeils A in Fig. 2;

Fig. 5

eine Seitenansicht eines Eckelements ohne Druckteile;

Fig. 6

eine Seitenansicht des Eckelements mit Druckteilen;

Fig. 7

einen Schnitt längs Linie 7-7 in Fig. 6;

Fig. 8

eine Draufsicht auf das Eckelement in Richtung des Pfeils B in Fig. 5;

Fig. 9

eine Draufsicht auf ein zweites Ausführungsbeispiel eines erfindungsgemäßen Bandspanners;

Fig. 10

einen Schnitt längs Linie 10-10 in Fig. 9;

Fig. 11

eine vergrößerte Gesamtansicht des zweiten Ausführungsbeispiels des erfindungsgemäßen Bandspanners beim Spannen mit Eckelementen oder Spannecken;

Fig. 12

einen Schnitt längs Linie 12-12 in Fig. 11;

Fig. 13

einen Schnitt längs Linie 13-13 in Fig. 11;

Fig. 14

eine Seitenansicht eines zweiten Ausführungsbeispiels eines Eckelements;

Fig. 15

eine Draufsicht auf das Eckelement in Richtung des Pfeils C in Fig. 14;

Fig. 16

eine Seitenansicht eines zweiten Ausführungsbeispiels des Eckelements in Fig. 14 mit Druckteilen und

Fig. 17

eine Ansicht eines montierten Druckteils in Richtung des Pfeils D in Fig. 16.

Further features and advantages are the subject of the following description and the drawing of some exemplary embodiments. The drawing shows:

Fig. 1

an overall view of a first embodiment of a belt tensioner according to the invention;

Fig. 2

a representation of a tensioning device of the first embodiment of the belt tensioner according to the invention with partially broken housing;

Fig. 3

a section through a portion of the clamping device along line 3-3 in Fig. 2;

Fig. 4

a plan view of the clamping device in the direction of arrow A in Fig. 2;

Fig. 5

a side view of a corner element without pressure parts;

Fig. 6

a side view of the corner element with pressure parts;

Fig. 7

a section along line 7-7 in Fig. 6;

Fig. 8

a plan view of the corner element in the direction of arrow B in Fig. 5;

Fig. 9

a plan view of a second embodiment of a belt tensioner according to the invention;

Fig. 10

a section along line 10-10 in Fig. 9;

Fig. 11

an enlarged overall view of the second embodiment of the belt tensioner according to the invention when tensioning with corner elements or clamping corners;

Fig. 12

a section along line 12-12 in Fig. 11;

Fig. 13

a section along line 13-13 in Fig. 11;

Fig. 14

a side view of a second embodiment of a corner element;

Fig. 15

a plan view of the corner element in the direction of arrow C in Fig. 14;

Fig. 16

a side view of a second embodiment of the corner element in Fig. 14 with pressure parts and

Fig. 17

a view of an assembled pressure part in the direction of arrow D in Fig. 16th

A belt tensioner shown as a whole in FIG. 1 comprises one from a tension band 10, preferably a textile band, formed outer loop 12a, which for example two Workpieces 14 and 16 encirclingly wrap around on the outside and to a clamping device designated as a whole by 20 is guided, which serves the outer loop 12a contract.

The clamping device 20 comprises a housing 22, in which as shown in Fig. 2, a tension element 24 is arranged, by means of an adjusting device designated as a whole by 26 relative to a basic element designated 28, which forms a base of the housing 22 and which has two loop bushings 30 and 32, through which the Tension strap 10 from the outer loop 12a into an interior of the Housing 22 is guided.

The outer loop 12a is provided with a lock Z with interconnectable and detachable lock elements Z ₁ and Z ₂ , which makes it possible to open the outer loop 12a in order to be able to put the outer loop 12a around the workpieces 14 and 16 without being able to these have to be pushed through the side of the loop. Furthermore, the lock Z creates the possibility, in the event that a particularly large outer loop 12a is required, to open the lock Z and to insert an extension piece between the lock parts Z ₁ and Z ₂ , which is connected at both ends to the lock part Z ₁ or Z _{2 has} connectable lock parts.

The tension element 24 comprises, as shown in FIGS. 2 and 3, two side walls 40 and 42 running parallel to one another, between which there is a spindle nut 44 and between which also on both sides of the spindle nut 44 and preferably pull rollers 46 and 48 lying symmetrically to the latter extend, each rotatable on the side walls 42 and 44 are mounted so that their axes of rotation 50 and 52 are preferably parallel and in a perpendicular to an axis 54 of the spindle nut 44 lying level 56.

In addition, are facing away from the base element 28 Side of plane 56 in a plane 58 parallel to this lying guide rollers 60 and 62 are provided, which are also extend between the side walls 40 and 42. The Guide rollers 60 and 62 lie opposite the pull rollers 46 and 48 offset to the spindle nut 44, and so far that a circumferential surface facing the spindle nut 44 64, 66 the same a smaller distance from the spindle nut 44, as one facing the spindle nut 44 Circumferential surface 68, 70 of the pull rollers 46, 48.

The entire tension element 24 is preferably composed of two parts 24a and 24b, the part 24a being the side cheek 40 and storage for the pull rollers 46 and 48 and the Guide rollers 60 and 62 includes which are integral with this are molded. Furthermore, the cheek 40 is also the Spindle nut 44 formed in one piece.

The second part 24b preferably includes the side cheek 42 as well as receptacles for the bearings of the pull rollers 46 and 48 and the guide rollers 60 and 62 and one on the spindle nut 44 adjacent and additionally stabilizing support element 72. The two parts 24a and 24b are through Common securing elements connected together.

As further shown in Fig. 2, the loop 12 goes out from a first fixable in a fixing device 80 End 82 and forms after the first end with one first loop center 12e one from the fixing device 80 outgoing, U-shaped loop wrapping around the pulling roller 46 84, following which the run 12e through the Loop feedthrough 30 in the form of a curved feedthrough slot through the base element 18 from the housing 22 emerges in order to then the outside of the clamping device 20th to form lying outer loop 12a.

The tensioning strap 10 also extends over the first end 82 the loop 12 and forms an end piece 86, which the base element 28 fixed by means of a holding pin 88 is, wherein the holding pin 88 is formed by the end piece 86 Passes through eyelet 90.

From a second end 92, which is also in the fixing device 80 is fixable, a second strand extends 12z of the loop 12 also in the form of a U-shaped Loop 94 over the pull roller 48 to then also through the loop passage 32 in the form of a curved slot in the base element 28 and emerge from the housing 22 to the outside of the jig To form 20 lying outer loop 12a.

Furthermore, the second end 92 extends Sling 12 the tension band 10 over the fixing device 80 out and forms a strap reserve 96, which over the circumferential surface 64 of the guide roller facing the spindle nut 44 60 of the tension element 24 is guided and in the connection to the guide roller 60 on a spool 98 in the form of a Winding 100 can be wound.

The coil 98 is, as shown in FIG. 4, between two Side walls 102 and 104 of the housing 22 are arranged and by means of one penetrating the side walls 102 and 104 Shaft 106 rotatably supported about an axis 108. On one side a crank 110 is rotatably connected to the shaft 106, with which the tension band reserve 96 in the form of the winding 100 the coil 98 can be wound up.

As further shown in FIGS. 2 and 3, the side walls 102 and 104 also provided with longitudinal slots 112 and 114, in which the pulling element 24 relative in an adjustment direction 116 is movably guided to the base element 28, the tension element 24 in the longitudinal slots 112 and 114 with projections 118 or 120 engages. Furthermore, that is Tension element 24 on inner sides 122 and 124 of the side walls 102 and 104 with outer sides 126 and 128 respectively and is thereby additionally non-rotatable, but in the direction of adjustment 116 slidably guided.

The longitudinal slots 112 and 114 run parallel to the Adjustment direction 116.

The movement of the tension element 24 relative to the base element 28 provided adjusting device 26 comprises a spindle 130, which passes through the spindle nut 44 and with her Spindle end 132 engages in a pressure piece 134, which in addition is still provided with a fixing shoe 136.

The spindle 130 with the one arranged at its spindle end 132 Thrust piece 134 is preferably used as a clamp usual clamping spindle equipped with a usual pressure piece 134, with the spindle 130 also by a Clamping clamps usual spindle handle 138 is rotatable.

The fixing shoe placed on the pressure piece 134 forms together with an abutment arranged on the base element 28 140 the fixing device 80, in which the first end 82 and the second end 92 of the loop 12 can be fixed. The Fixation takes place in that the two ends 82 and 92 of the Loop 12 between the abutment 140 and the fixing shoe 136 then be clamped when the spindle 130 through Turning the spindle handle 138 is rotated so that the Traction element 24 moves away from the base element 28 and thus the on the loops 84 and 94 in the sense of enlarging them acting pull rollers 46 and 48 ultimately lead that both over the first run 12e and the second run 12z the strap of the outer loop 12a through the Loop bushings 30 and 32 in the housing 22 below Reduction of the outer loop 12a is drawn. Around to apply the force with which the pull rollers 46 and 48 on the loops 84 and 94 to enlarge them act, the spindle 130 must over the pressure piece 134 and ultimately support the fixing shoe 136 on the base element 28, this over the between the fixing shoe 136 and the abutment 140 clamped ends 82 and 92 of the loop 12 takes place, so that ultimately the support of the spindle 130th via the fixing device 80 on the base element 28 and thereby simultaneously the ends 82 and 92 of the loop fixed relative to the base element 28.

That of the tension element 24 as it moves from the base element 28 path walked through affects the enlargement of the two loops 84 and 94 ultimately in four Way in the outside of the jig 20 lying outer loop 12a in the sense of shortening the same out.

To clamp the workpieces 14 and 16, the outer loop lying outside the tensioning device 20 12a either with or without corner elements to be explained 140 placed around the workpieces 14 and 16 and by winding the tension band reserve 96 on the spool 98 with the adjusting device released 26 the outer loop 12a contracted so far, that either this directly or via the corner elements the workpieces 14, 16 abut against them.

In this released position of the adjusting device 26 lies the tension element 24 in its closest to the basic element Position, and thus also the fixing shoe 136 is supported not on the abutment 140, so that the second strand 12z in the form of the strap reserve 96 continuing Tension band 10 pulled through the fixing device 80 can be, and then with the workpieces 14 and 16 adjacent outer loop 12a then the second end 92 in the Fixing device 80 is located.

Now the spindle handle 180 is rotated so that by action the spindle 130, the tension element 24 is different from the base element 28 moved away, the spindle end 132 is inevitably supported via the pressure piece 134 and the fixing shoe 136 on the Abutment 140 from, so that by the fixing shoe 136 and the abutment 140 formed fixing device 80 the ends 82 and 92 of the slings fixed by clamping and now by the movement of the tension element 24 conditional enlargement of the loops 84 and 94 in the sense of a Reduction of the outside of the clamping device 20 outer loop 12a, so that thereby the workpieces 14 and 16 are clamped together.

Targeted around the workpieces 14, 16, preferably in the area their corners with a starting from the outer loop 12a To be able to apply clamping force are preferred Corner elements 140 in the context of the belt tensioner according to the invention applicable.

As shown in Figs. 5 and 6, each of these corner elements comprises 140 a base body 142 which has two pressure lugs 144 and 146, between which there is a cavity 148, the the one that extends to the pressure tabs 144 and 146 Basic body 142 encompasses a U-shaped cross section.

The cavity 148 serves to corner one of the workpieces 14 or 16 to record, with the base body 142 on both sides the corner on the workpiece.

The base body 142 can directly with the Support pressure tabs 144 and 146, provided this does not result in a superficial Workpieces 14 or 16 are damaged.

It is particularly advantageous if the pressure lugs 144 and 146 are still provided with pressure parts 148, 150 which, as in 6 and 7, have flat pressure surfaces 152, with which the pressure parts 148 and 150 on the surface of the respective workpiece 14, 16 can be placed. The printing areas 152 form the surface of a pressure plate 154, of their opposite narrow sides on one of the Pressure surface 152 opposite side of the pressure plate 154 Stand bearing plates 156 and 158, with which the pressure parts 148 on the pressure lugs 144 or 146 can be pivoted about an axis 160 are stored.

The bearing plates 156 and 158 preferably have Bores 162 in which one at each opposite Outer sides 164, 166 of the pressure lugs arranged cylindrical projection 168 and 170 engages and thereby Pivots for the pressure parts 148 forms.

The base body 142 has in the direction of the pivot axis 160 and thus also in the longitudinal direction of the pressure surface 152 Expansion, which is a secure support of the strap 10 guaranteed with its entire width transverse to its longitudinal direction.

For this purpose, the base body 142, as shown in FIGS. 5 and 8, on its side opposite the cavity 148 a preferably curved support surface 180 for the Tensioning strap 10, wherein on both sides of the support surface 180 from Base body 142 rising over the bearing surface 180 Side webs 182 and 184 are formed, between which the Tensioning strap 10 is guided lying on the bearing surface 180 and which a lateral sliding of the strap over prevent the bearing surface 180.

In addition, extend from each of the side webs 182 and 184 approximately up to a centerline 186 of the support surface 180, which is also a centerline of the one lying on this Tension band 10 represents reaching and in the longitudinal direction of the tension band 10 are spaced apart projections 188 and 190 which support surface 180 at a distance of this overlap and a space 192 or 194 leave between themselves and the bearing surface 180 so that the strap 10 can be pulled through this space is. So that the strap 10 is not only on both sides of the Support surface 180 through the side webs 182 and 184 instead also opposite the bearing surface 180 through the projections 188 and 190 so fixable on the base body 142 that the tensioning strap 10 does not pass over the base body 142 by itself can slide away, so that the base body 142 is also loose Tension strap is guided in the same longitudinal direction, since the projections 188 and 190 a complete detachment from the contact surface Prevent 180.

The fact that the projections 188 and 190 each only extend to the center line 186 of the contact surface 180, is the insertion of the strap 10 in the Spaces 192 and 194 possible in a simple manner, namely characterized in that the strap in the direction of each Projection 188 or 190 carrying side web 182 or 184 in the space 192 or 194 can be inserted.

The base body 142 is preferably formed by two halves 142a and 142b, which are identical and in one another along a plane running along the center line 186 fit and are fixed relative to each other.

In a second embodiment, shown in FIGS FIGS. 9 to 15 comprises the one labeled 210 in FIG. 9 Tensioning device a tape guide 212 - which the tension element represents - a housing 214, a clamping spindle 216 with a Pressure plate 218 and a spindle handle 220.

The strap 222 is - for example, with its outer Noose - shown exposed around two workpieces 224 and 226.

When pulling the strap in the direction of arrow 223 in the simplest case, the strap is directly attached to the Workpieces 224 and 226. On the spindle handle 220 is about Spindle 216 the pressure plate 218 from its zero position in a depression 213 led out and lies on the upper part 215 of the housing 214 - which forms the basic element - on.

The pressure plate 218 clamps between itself and the upper one Part of the housing 214 the hinge sides 225 and 227 - or also Ends of the loop of the tension band called - one and makes additional clamping of the hinge sides with the tensioning process 225 and 227 superfluous.

Locking elements that are otherwise necessary are thus eliminated.

The band end 225 shown above in FIG. 9 is in one area 203 of housing 214 is held firmly and is in the other Direction around a deflection corner 230 through a housing opening 209 of the housing 214 led to the outside. The one shown below Band end 227 becomes an actuation side around a corner 233 led out of the housing 214.

In the other direction it runs around a deflection corner 232 and forms the opposite side after passing through a housing opening 207 the workpiece enclosure.

Pushes through a nut thread 217 in the band guide 212 the pressure plate 218 the housing 214 towards the workpiece 26 and pulls the strap twice around the deflection corners 230 and 232 of the tape guide 212.

As a result, a double pulley comes into effect and doubles the stroke of the spindle 216 on both sides Clamping process. If the stroke of the spindle is 216 h, then it is Total travel of the tape s = 2x2h, i.e. s = 4h.

The housing 214 encloses the band guide 212 - or else Called tensile element -, narrow and results with lateral inner surfaces 234 or 235 an exact guide for the tape guide 212 during the clamping process.

To prevent the tape guide 212 from falling out completely, can be on one of the two preferably in plastic executed parts 212 and 214 locking cams in general known execution can be provided.

The band guide preferably has 212 - or also tension element called - arrow marks 236, which indicate an insertion of the Lightening strap, as shown in Fig. 9.

Protrusions are provided on housing 214, preferably shown by cams 237 and 238, between which the strap 222 wound up when storing the tensioning device can be. In one slot 239, one end of the tension band can be be secured against independent winding.

10 is a top view of a tensioning device 210 shown without workpieces 224 and 226. The brought out Tensioning strap 222 is drawn cut off on both sides.

The preferably provided reinforced wide tension band 222 is exactly between a longitudinal side 240 of the housing 214 and the tape guide 212, d. H. the tension element, guided, twisting and deflection is not possible.

Provided for the tensioning strap 222 in the strap guide 212 Band channels have a depth down to a stable lower part 241 of the tape guide 212, the bandwidth with something additional Match corresponds. This gives a band center or an actuation axis 205 an asymmetrical position that the Operated by hand when lying on a mat accommodates.

In Fig. 12, the jig 210 is together with four suspended corner elements or clamping corners 250 and an inserted Workpiece 252 shown. An enlarged view 254 one of the four clamping corners 250 shows more clearly the constructive embodiment.

A base body 256 is a hollow body, preferably with Self-suspension executed, in the present case as an open Cylinder with an opening 258 the corners and miters spring-loaded. The contact with workpiece 252 takes place with a rounding 260 which is suitable for all angles.

In an interior of the base body designed as a hollow body 256 is space for workpiece tips for observation exposed, such as alternatively for lace Angle 261 or obtuse angle 262 in the area of the workpiece tips shown in Fig. 3.

The also cylindrical outer shape of the clamping corner 254 leaves the tensioning strap 222 when tensioning without great friction losses slide along. It runs within a slot 264 on the section 265 visible on average along a line 12-12 (in Fig. 12).

An insertion bevel 266 is provided on the opposite side. Two barbs 267 and 268 prevent accidental loss of the corners 254.

In a section along line 13-13 shown in FIG. 13 are a corresponding paragraph 269 and an introductory margin 270 shown.

To make it easy to use for a user to see make is a double arrow in the illustrated embodiment 271 provided on the housing 214, which clearly the Direction for pulling the tension band in or out displays.

The arrangement of tabs 267 and 268 and shoulder 269 is again clearly shown in Fig. 14 and 15, the Paragraph 269 of the noses 267 and 268 clearly below one End 272 of the slot is so that the strap before slipping out is secured.

16 and 17 are clamping corners 250 with a rotatably arranged Rake face 274 shown. In an opening which at a height, characterized by a point 275, ends and at a depth, marked with a point 276, Allows play, a part 277 is rotatable on a cylinder surface with a section forming a diameter of 278 of the base body 256 clipped on.

The clamping surface 274 has a transition radius 280 around it. The axis of rotation 279 of the pressure plate 277 corresponds to the asymmetrical arranged axis 205 in FIG. 10.

A belt tensioner with a tensioning device is particularly advantageous or a tensioner 210, which also with two or more clamping corners 250 to protect the workpiece edges and for better sliding of the tensioning strap 222 around these edges is provided.

It is particularly expedient if the clamping corners 250 or corner elements for edge or miter angles from 45 ° to 120 ° can be used continuously.

Conveniently, these corners are 250 or corner elements subsequently captive on the strap 222 as required mountable.

Furthermore, it is particularly expedient if - as in FIGS. 14 and 15, the clamping corner 250 in one piece in an open Cylinder shape is made. Preferably, the Opening 258 - as shown in Fig. 11 - defined so that acute angle - designated by the reference numeral 261 - or also obtuse angles - designated by the reference number 262 - have space in the inner space or cavity of the hollow cylinder.

It is also particularly advantageous if the tape guide in a slot 264, which is open at the top, after has a shoulder 265 below and an insertion bevel 266 above and on both sides a cam 267 and 268 on the Cylinder is molded with an insertion slope 270 and a barbed approach 269 for securing of the strap. The approach 269 is lower than the slot outlet 272.

It is also expedient - as shown in FIGS. 16 and 17 - For better contact with workpiece 252, the respective one Spannecke 250 - or also called corner element - with with clamping surfaces 274 provided parts 277 - or also called pressure parts - Provide a rounding with a Part 27 of the clamping corner 256 forming the diameter 278 is clipped on are.

In addition, it is advantageously provided that the Center line 279 of the recess provided in the clamping corner 256, formed by boundaries 275 and 276, which with 205 marked center line in Fig. 10 corresponds.

Claims (34)

1. Strap clamping device with a clamping strap (10, 222) forming an outer loop (12a) to wrap around one or several workpieces (14, 16, 224, 226), with a tightening device (20, 210) relative to which a first end (82, 225) of the loop (12a) is fixable, and by means of which the outer loop (12a) is tightenable to clamp the workpiece or workpieces (14, 16, 224, 226), the tightening device (20, 210) including a base element (28; 215) supported on the loop (12) with a guide opening (30, 32; 209) through which the loop is guided, and a pull element (24; 212), with an adjusting device (26, 216) by means of which the pull element (24; 212) and the base element (28; 215) are moveable relative to each other, the outer loop (12a) being tightenable under the effect of a pulley upon relative movement of base element (28; 215) and
   pull element (24; 212), characterized in that the loop (12) runs between the base element (28; 215) and the pull element (24; 212) and engages the pull element (24; 212) such that upon relative movement of base element (28; 215) and pull element (24; 212), the outer loop (12a) is tightenable under the effect of a double pulley, in that the size of the loop (12) is variable, and in that a second end (92; 227) of the loop (12) is fixable on the tightening device (20, 210) by means of a fixing device (80).
2. Strap clamping device as defined in claim 1, characterized in that the loop (12) rests with a first section (82, 92; 225, 227) on the base element (28; 215) and at least at two further sections (84, 94) on the pull element (24; 212) in engagement therewith.
3. Strap clamping device as defined in claim 2, characterized in that the loop (12) forms two loop sections (84, 94) whose turns form the two further locations at which the loop (12) rests on the pull element (24, 212).
4. Strap clamping device as defined in any one of the preceding claims, characterized in that a first end (82; 225) of the loop (12) is arranged at a fixed location on the clamping strap (10; 220), and in that the clamping strap (10; 220) continues beyond a second end (92; 227) of the loop (12) as clamping strap reserve (96), and in that the size of the loop (12) is variable by increasing or decreasing the clamping strap reserve (96).
5. Strap clamping device as defined in claim 4, characterized in that the first end (82; 225) and the second end (92; 227) of the loop (12) engage the tightening device (20, 210).
6. Strap clamping device as defined in any one of the preceding claims, characterized in that the first end (82; 225) and the second end (92; 227) are fixable in the fixing device (80) of the tightening device (20, 210).
7. Strap clamping device as defined in any one of the preceding claims, characterized in that the fixing device (80) acts on the clamping strap (10, 222) to secure it by force.
8. Strap clamping device as defined in any one of the preceding claims, characterized in that the fixing device (80) comprises a fixing element (136; 218) and an abutment (140; 215) between which the clamping strap (10, 222) is clampable.
9. Strap clamping device as defined in any one of the preceding claims, characterized in that the fixing device (80) and the adjusting device (26) are simultaneously actuatable.
10. Strap clamping device as defined in claim 9, characterized in that the fixing element (136; 218) is actuatable by the adjusting device (26) when the base element (28; 215) and the pull element (24; 212) move relative to each other.
11. Strap clamping device as defined in claim 10, characterized in that the adjusting device (26) is supported via the fixing device (80) on the base element (28; 215).
12. Strap clamping device as defined in any one of the preceding claims, characterized in that the pull element (24; 212) comprises two pull members (46, 48; 230, 252), each of which acts on the loop (12) at one of the at least two locations (84, 94).
13. Strap clamping device as defined in claim 12, characterized in that the pull members (46, 48; 230, 232) are arranged on either side of the adjusting device (26) on the pull element (24; 212).
14. Strap clamping device as defined in any one of the preceding claims, characterized in that the adjusting device comprises a spindle (130; 216) and a spindle nut (44; 213) running on the spindle (130; 216).
15. Strap clamping device as defined in claim 14, characterized in that the spindle nut (44; 213) is held on the pull element (24; 212) and the spindle (130; 216) is supported on the base element (28; 215).
16. Strap clamping device as defined in claim 15, characterized in that the spindle (130, 216) is supported with a spindle end (132) on the fixing element (136; 218) of the fixing device (80).
17. Strap clamping device as defined in any one of the preceding claims, characterized in that the pull element (24; 212) is guided so as to be non-rotatable, but moveable on a linear guide connected to the base element (28; 215) in the direction towards or away from the latter.
18. Strap clamping device as defined in claim 17, characterized in that the linear guide is part of a housing (22; 214) of the tightening device (20, 210).
19. Strap clamping device as defined in any one of the preceding claims, characterized in that the base element (28; 215) is part of the housing (22; 214).
20. Strap clamping device as defined in any one of the preceding claims, characterized in that the base element (28; 215) has two guide openings (30, 32; 209), each of which is for one respective strand (12e, 12z) of the loop (12).
21. Strap clamping device as defined in claim 20, characterized in that the guide openings (30, 32; 209) are located such that the respective strand (12e, 12z) of the loop (12) following on the respectively formed loop section (84, 94) between the base element (28; 215) and the pull element (24; 212) extends through the respective guide opening (30, 32; 209).
22. Strap clamping device as defined in any one of claims 4 to 21, characterized in that the tightening device (20; 210) has a carrier (98; 214) for the clamping strap reserve (96).
23. Strap clamping device as defined in claim 22, characterized in that the carrier (98; 214) is designed as a winding member for the clamping strap reserve (96).
24. Strap clamping device as defined in any one of the preceding claims, characterized in that the outer loop (12a) is provided with corner elements (140; 250) for acting on the workpieces (14, 16; 252).
25. Strap clamping device as defined in claim 24, characterized in that the corner elements (140; 250) are fixable on the clamping strap (10, 222) such that they cannot be lost.
26. Strap clamping device as defined in claim 25, characterized in that the corner elements (140; 250) are provided with holding elements (188, 190) which engage the clamping strap (210; 222).
27. Strap clamping device as defined in claim 26, characterized in that the holding elements (188, 190) are designed such that the clamping strap (10) is pushable transversely to its longitudinal direction into a position fixed by the holding elements (188, 190) at the corner elements (140).
28. Strap clamping device as defined in claim 26 or 27, characterized in that the holding elements (188, 190) engage over the clamping strap (10) from a side edge on a flat side.
29. Strap clamping device as defined in any one of claims 26 to 28, characterized in that the clamping strap (10) is secured against sliding out of the respective holding element (188, 190).
30. Strap clamping device as defined in any one of claims 24 to 29, characterized in that the corner elements (140; 250) surround a cavity (148) in U-shaped configuration and at the ends of the legs of the U have pressure noses (144, 146) with which the corner elements (140; 250) act on the workpieces (14, 16; 252).
31. Strap clamping device as defined in claim 30, characterized in that the pressure noses (144, 146) rest on opposite sides of the corners of the workpieces (14, 16).
32. Strap clamping device as defined in claim 30 or 31, characterized in that the corner elements (140, 250) are provided in the region of their pressure noses (144, 146) with pressure parts (148, 150) which are pivotably mounted on the pressure noses (144, 146) and, for their part, have pressure surfaces (152; 274) with which the pressure parts (148, 150) act on the workpiece (14, 16; 252).
33. Strap clamping device as defined in claim 32, characterized in that the pressure parts (148, 150) are provided with plane or slightly curved pressure surfaces (152; 274).
34. Strap clamping device as defined in any one of claims 24 to 33, characterized in that the corner elements (140; 250) are designed such that the clamping strap (10; 222) rests fully on these.

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