CH673614A5 - - Google Patents

Description

The invention relates to a tensioner with an actuating part for an elongated clamping means, which can be shortened operationally between its ends by an actuating device which is positively controlled in one direction. 10 An exemplary application of such tensioners is the tensioning of sheet metal segments in pipeline construction, in particular for cladding pipes. A known so-called one-hand clamp has a plier-like structure with two pliers levers that operate a sliding foot 15, which forcibly displaces a metal tensioning strap in one direction and thereby shortens a loop of the tensioning strap, which for example encompasses a tubular segment on the outer circumference, and thus shortens it tense. Before tensioning begins, however, the metal tensioning strap must first be inserted into the 20 known tensioners. Real one-hand operation is therefore not possible because two parts have to be gripped, namely the actual tensioner itself and the tensioning strap. This often leads to difficulties in difficult assembly conditions, for example on 25 construction sites. Furthermore, the tension band wears out relatively quickly due to the intensive action of the sliding foot on the tension band and must therefore be renewed frequently. It is of particular importance, however, that this known tensioner also exerts 30 relatively strong forces on a tube part tensioned in the tension band loop in the radial direction inwards due to the functioning of the sliding foot. Without further precautions, the known pipe part is deformed or at least its surface is damaged. To avoid such damage, 35 technicians usually use shims that have to be inserted under the tensioning strap at the point where the tensioning foot of the tensioner acts. This results in considerable complications in the handling of the known tensioner, since a further part is required for proper operation, which is only held when the tensioning action is started and can therefore easily fall down beforehand, which at least in particular when working at a greater height is extremely annoying and can significantly increase the time required to clamp a part. 45 Finally, the position of the sliding foot with respect to the actuating levers cannot be changed. This leads to the fact that such a tensioner can often only be used poorly or not at all in confined spaces, since the required free space for the actuating levers is not or only insufficiently available.

Another known tensioner has two levers pivotably connected in a V-ar arrangement by means of an axis of rotation. At the end of the one lever remote from the axis, a tensioning strap is fastened with one end. The free end of the tensioning band is guided around a part to be tensioned and inserted into a roller arranged around the connecting axis. A tooth lock is arranged on the outer sides of the roller, which interacts 60 with pawls arranged in the levers, so that when the levers are moved against each other, the reeling drum is rotated in one direction and prevented from turning back. With this tensioner, the strap is attached to the tensioner so that it cannot be lost. However, the free end of the strap remains free and unrolled and therefore interferes with transport, for example. A uniform clamping effect on the part to be clamped is only achieved if the clamping band lies flat on the part without twisting. Is therefore accidentally

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There was a twist, which can only take place in parts of the process by actuating the actuating parts of the tensioner of larger diameter when applying the tensioning strap. In particular, this is a real one-handed operation

it is difficult to check, the tensioning strap must be possible from the opening, since the reeling drum is no longer removed as in the prior art, and after removing the loops in the tensioning strap can be reinserted with the aid of the other hole. Due to its construction, 5 hand of the fitter has to be lifted. A special

this lever tensioner is not a flat, but an essentially simple return device can be removed by a point-wise load on the part to be tensioned, the drum or tensioner axis articulated

namely in the area of the locking spring with the tensioning strap. Of course, it is also possible

bound lever, on which the other lent about the axis of rotation, the rotary movement of the drum when unwinding the

Lever attacks. With this tensioner, too, there is therefore another way to counteract the tensioning strap, for example

Risk of damage to the covered part. The forces arising from a winding on the drum axis during unwinding during the swiveling or tensioning movement of the free rope, the free end of which with a helical spring or a handle lever, cannot be connected by the base other linear spring element that the drum

lever are held up. From a one-hand operation to a turning back and thus rewinding can not be spoken anyway with this lever tensioner.

are provided, because for actuation one lever with a gear lock and the other lever with the other hand, a so-called ratchet or ratchet, are advantageously provided, which must be locked. It is only when the tensioning process has almost been completed that it can be safely locked without a large amount of components, that the movement of an arm on the free heath is sufficient that the retractor unintentionally returns to actuation. The working position of the well-known 20 spuit; And a secure clamping effect can be achieved. Whoever holds the tension in relation to the part to be clamped cannot. It is particularly advantageous if, according to another, changes are made which affect the possible uses and / or the advantageous embodiment of the invention, the teeth of the manageability of the tensioner. Tooth ratchets on the circumference of at least one side window The invention is therefore based on the object which the drum is arranged. Due to the distance, the existing tensioner was to be further developed and a tensioner for the teeth on the outer circumference of the central axis should be available, which can be used more universally because there is a relatively large lever arm, which means that the tensioning part is less stressed and, in particular, widest relative allow high torques to be reached and thus enable real one-hand operation. the tension effect is increased.

The object is achieved by a tensioner with an actuator. In a further advantageous embodiment, the supplementary part for an elongated tensioning means, which between 30 fmdung, the actuating device has two ends operating in opposite directions by means of a lever actuating device which can be moved in one direction and is forced to one another about the axis of the drum can be shortened, with, for example, in pliers-like arrangement. In particular, one end of the tensioning means is simple and easy to handle with one hand, which is invented and the other end section of the tensioning means on the arrangement according to the invention when the first lever and tensioner can be fixed indirectly or directly. 35 the second lever with one of each button

First of all, this ensures that the actuatable pawl is provided,

Clamping means is fixed on the clamp and is not lost in the tooth lock is formed. That can go from one. When the tensioner is not in use, the locking lever operated pawl pushes the ratchet of teeth onto the retractor before being clean and tidy, and the locking pawl on the other lever prevents the tooth

rolled, which means that there is always no further preparatory lock on returning as soon as the tooth

Operations for tensioning are available. For a locked is reached. If both buttons are pressed simultaneously

The one end of the tensioning means is preferred, so that both pawls are loosened by way of a positioning part of the tooth lock, which is now free, and can be pulled out of the retractor and with the free drum as a result of the Effect of the feedback device

Turn the end section back, for example using a suitable eyelet, a 45 and tension (pre) or tension the tensioning strap

Hooks or the like, directly on the tensioner or with the middle. A safe and easily releasable action of the pushbuttons via an intermediate piece fastened to the tensioner on the pawls can be achieved by the fact that the The positioning part can be a simple guide roller for the first button and / or the second button, each with a

be the tensioning strap, which ensures that the strap is provided without the one, which is securely guided to the tensioner via the button, the associated locking mechanical abrasion, er50 pawl engages with the tooth lock.

but can also consist of a separate guide bracket or advantageously a compression spring is between the levers. the provided. This further facilitates real one-handed

Advantageously, the retractor is designed to serve as a drum, since the levers no longer move the axis of the tensioner, the drum being rotatable. One must have to be (this is achieved by the tension spring arranged between the lever levers particularly easily 55 arranged compression spring), but only an increase and pull it off again. Another squeeze of the levers is required for tensioning. An important advantage arises if, according to an advantageous embodiment of the invention, the reel-up device is favorable from an ergonomic point of view.

a feedback device is provided. In this way, the positioning part is advantageously sufficient for the tensioning strap, if it is not fastened anywhere, to preferably provide a deflection device for the tensioning means.

is, automatically automatically wound onto the reel-up device for deflecting the clamping means by approximately 90 °.

becomes. This has advantages in particular when applying this. It is easily achieved that the clamping

Strap to a part to be tensioned; For this purpose, the tensioning strap is always lent around this part and also engages in the circumferential direction of a part to be tensioned, so that no point-wise pressure load is latched onto the free end of the tensioner. Exercises the lots in the 65th part. In a particularly advantageous embodiment

The tensioning band is then automatically moved through the positioning part with one of the tensioners according to the invention.

The reeling device provided with the return device is designed to be latchable in open areas. The positioning part can be picked up and achieved in such a way that the actual clamping - this way always in the same orientation to the part to be machined

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Put on the other part. Because of the detent, the considerably longer actuating part, ie the “pliers levers”, can be pivoted relative to the positioning part; the alignment of the actuating levers can thus be selected, and actuation of the tensioner according to the invention is considerably facilitated, in particular in the case of limited space, without the tensioning effect suffering as a result or different loads being exerted on the part to be tensioned, for example in different orientations.

If, according to a further advantageous embodiment of the invention, the one lever in the area of the drum is provided with a housing part largely enclosing it, in particular on the sides, the drum and associated parts are well protected against external influences. The lever and the housing part are preferably made in one piece.

A particularly simple and inexpensive locking device for the positioning part is obtained if, at least on one side, locking recesses are provided on the housing part, with which a corresponding locking means arranged on the inside of the positioning part can be brought into engagement.

The tensioner according to the invention can also be used advantageously for other purposes without major modifications, which creates a tool with multiple functions. For this purpose, the levers can be formed on their 25 shorter sections with respect to the axis with opposing cutting surfaces to form pliers. In this way, the one-hand clamp according to the invention can also be used as pliers, for example for cutting off binding wire or for similar purposes.30 A similar design as sheet metal shears also offers numerous advantages during assembly, in particular when cladding pipes with sheet metal.

The design of the one-hand clamp according to the invention does not require any restrictions in the choice of material. 35 Accordingly, the one-hand clamp according to the invention can be manufactured inexpensively from a wide variety of materials. Depending on the additional requirements, materials such as sheet steel, which is particularly cost-effective, tool steel for higher strength requirements, or plastics, for special strength requirements, possibly reinforced by additional fibers such as carbon fibers, may be considered. A corrosion-free construction can then be achieved without any problems. 45

The invention is described in more detail below with reference to exemplary embodiments shown in the drawings, from which further advantages and features result.

Show it:

FIG. 1 shows a side view of a one-hand clamp according to the invention;

Figure 2 Another side view in a highly schematic representation;

FIG. 3 shows a front view of an actuating lever of a one-hand tensioner according to the invention with a drum with a tensioning band wound thereon;

FIG. 4 shows a rear view of the one-hand clamp according to the invention according to FIG. 2;

Figure 5 is an enlarged view of a positioning part to illustrate the strap guide; 60

FIG. 6 another embodiment of a one-hand clamp according to the invention, which is additionally designed as pliers or side cutters;

FIG. 7 shows a front view of a positioning part in an arrangement rotated by 90 'in relation to FIG. 5; and 65

Figure 8 Four different orientations (a to d) of a one-hand clamp due to different engagements of a positioning part.

The one-hand tensioner 10 according to the invention shown in FIG. 1 has two actuating levers 12, 14 arranged on a common axis of rotation 20, the lever 12 essentially having a rod shape and the lever 14 continuing in its upper bearing part in a housing part 16 which actuates the actuating lever 12 spreads.

A drum 22 is arranged in the housing 16 on the axis 20, as can best be seen in FIG. The drum 22 is limited in its width by two side disks 23, which are provided on their peripheral surface with teeth 24 in the form of a so-called tooth ratchet.

Also on the axis 20, and at a short distance from a side view 23 of the drum 22, one end of a spiral spring 26 is articulated, the other end of which is attached to the housing 16, as can be seen in particular from FIG.

When the drum 22 and thus the axis 20 rotate clockwise (in the illustration in FIG. 1), the spiral spring 26 is quasi wound onto the axis 20 and thus tensioned, as will be described in more detail below.

The actuating lever 14 has an opening 27 on the end face in which a button 28, which can be rotated about an axis 32, lies. The key 28 has on its upper,

inwardly projecting end on a pawl 30 which is designed to correspond to the teeth of the tooth ratchet 24 and can be brought into engagement with the latter (the two toothings 24).

The end of the button 28 facing away from the pawl 30 is acted upon by the free end of a leaf spring 34 in the outward direction, the leaf spring 34 being fixed on the inside of the actuating lever 14 via a rivet 36. Due to the lever action about the axis 32, the pawl 30 is guided by the spring 34 against the tooth ratchet 24 behind the respectively corresponding tooth.

As a result of the shape of the teeth, the drum 22 can also move in one direction (in FIG. 1: counterclockwise) when the pawl 30 is inserted, the pawl 30 engaging behind a tooth in each case after overrunning and thus preventing the drum 22 to rotate in a clockwise direction (Figure 1). The action of the pawl 30 can be canceled by pressing the button 28 against the action of the spring 34, as will be described in more detail below.

In an analogous manner, a button 38 with a pawl 40 is provided on the other actuating lever 12. The button 38 is rotatably mounted on an axis 42 arranged in the actuating lever 12, the axis 42, like the axis 32, being arranged parallel to the axis 20. The key 38 is acted upon by a leaf spring 44, which is held in the actuating lever 12 by a rivet 46, analogous to the description of the key 28 and spring 34. The above remark in connection with the key 28 and the pawl 30 also applies analogously to the key 38 with its pawl 40.

The actuating levers 12, 14 are spring-loaded against one another, here via a U-shaped spring 38 fastened in the free end regions of the levers 12, 14 via rivets 52, 50 and bent inside. This spring 48 presses the two levers 12, 14 apart and thus facilitates the handling, in particular the one-handed operation of the tensioner, because the levers 12, 14 now only have to be pressed together and the pressing apart, which is difficult to achieve with one-hand operation, is brought about by the spring 48. The operation and function as such are described in more detail below.

The axis 20 projects beyond the housing 16 on both sides and thus serves to receive a bracket-like positioning device.

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device 18, which engages over the housing 16 and rotatably supports on the axis 20.

The base leg of the bracket 18 has in its upper half an inwardly angled deflection plate 54 and a passage opening 74 arranged underneath, the function of which is described in more detail below in connection with FIG. 5.

On the housing part 16, which is largely open at the top in this exemplary embodiment, as can be seen in FIG. 3, four latching recesses 56, 58, 60, 61 which run essentially radially and at a distance from one another are provided in the side walls.

On the leg of the positioning bracket 18 facing the latching recesses 56, 58, 60, 61, the latter has a latching projection 62 which projects in the direction of the housing 16 and thus in the direction of the latching recesses.

On the opposite side of the housing between the U-leg of the bracket 18 and the housing 16, a corrugated spring 90 is arranged, which is also rotatably seated on the axis 20 and is otherwise attached to the bracket 18 at the opposite end.

With an axial pressure in the direction of the arrow shown in Figure 7 on the positioning device 18 against the action of the spring 90, the locking projection 62 is lifted from the associated locking recess and the positioning device 18 can now be pivoted about the axis 20 until the locking projection 62 in front of one stands other latching recess of the housing and snaps into it after removal of the axial pressure.

In this respect, different positions of the bracket 18 relative to the housing 16 can be set (FIG. 8).

While FIGS. 2 and 4 show corresponding side views of the one-hand clamp according to the invention shown in FIG. 1, FIG. 3 shows the front view of the tool according to the invention corresponding to FIGS. The drum 22, which is rotatable on the axis 20, and a textile tensioning strap 64 wound onto the drum 22 can be clearly seen in the upper half. Laterally, ie axially with respect to the axis 20, the tensioning strap 64 is guided securely through the side disks 23 of the drum 22.

The course of the tensioning strap 64 is illustrated in FIG. The tensioning strap 64 is with an end section on the

Axis 20 of the drum 22 fixed, for example by means of 45 of the 26 free for rewinding.

Component (with the keys 28, 38 pressed), the keys 28, 38 can be released so that the drum movement is stopped. Then the buttons 28, 38 are briefly pressed again together, so that the path of the drum 22 is released-5 and, according to the restoring force of the spring 26, it rotates counter to the direction of rotation when the tensioning strap 64 is being unwound, and the tensioning strap 64 is already doing so preloaded so that it lies completely and flat on the surface of the component to be clamped. Herein belo is a considerable advantage over known devices because it makes the one-hand operation considerably easier.

This also ensures that there is no punctual pressure load on the corresponding encased component 15, because - as is readily apparent from FIG. 5 - a force load occurs exclusively in the tangential direction, even during the subsequent actual clamping process.

In addition, measures previously required according to the prior art, such as shims or the like, have been omitted.

After the «pre-tensioning» described, the actual tensioning process takes place in that the actuating levers 12, 14 are moved several times relative to one another. About the 25 pawls 30, 40, the drum (the toothed disk (s) 23) - in the illustration in Figure 1 - are moved counterclockwise, so that the tension band 64 "wound" on the drum 22 and the spring 26 by the axis 20 are "unwound" until the desired clamping state is reached.

To release the device after the pipe segment to be tensioned has been riveted, for example, the two buttons 28, 30 are pressed against the resistance of the springs 34, 44 and the tensioning strap 64 is released. Then the 35 restoring force of the spring 26 causes the tensioning strap 64 to roll onto the drum 22 (in the starting position).

The desired positive guidance of the drum 22 comes about through the combined action of the pawls 30, 40. As long as only one of the two pawls 30, 40 40 is in engagement with the toothed ratchet of the drum 22, this is prevented from moving backwards (clockwise, FIG. 1). Simultaneous actuation of both buttons 28, 38 releases both pawls 30, 40 and thus gives the drum 22 return due to the action of the spiral

ner screw 62 and possibly a washer and / or washer. From the drum 22, the tensioning strap 64 passes from the upwardly open housing 16 to a cutout 74 in the front section (base leg) of the positioning part 18 and is deflected there by means of the deflection plate 54 by approximately 90 ° to the side.

An end section 66, preferably made of the same material as the tensioning band 64 (high-strength plastic fabric band) is fastened by means of a loop 68 to the positioning part 18 on the other side of the cutout 74, that is to say opposite the deflection plate 54. At the opposite free end, the section 66 has, for example, a hook, an eyelet or the like, into which the free end of the tensioning strap 64 is hooked, latched or hooked in after being guided around the component to be tensioned via a corresponding anchoring element (not shown). The spring 26 is tensioned at the same time.

Instead of a separate end section 66, the tensioning strap 64 can also be fixed directly according to an alternative embodiment of the invention with a corresponding anchoring part in a corresponding receptacle of the tensioner (here: in the positioning bracket 18).

After strapping the to be exciting

50

FIG. 6 shows a further one-hand clamp 80 according to the invention, which does not differ from the aforementioned embodiments with regard to the parts required for clamping, but in which a pliers cutting function is integrated.

In this embodiment, the housing part of the actuating lever 84 is formed in its upper end section with an angular recess 83 and the actuating lever 82 is extended beyond the bearing area about the axis 55 86 in the direction of this recess 83.

The recess 83 and the short leg of the actuating lever 82 are provided with mutually corresponding sections 82a, 84a, on each of which cutting surfaces 82b and 84b are formed.

Accordingly, when the operating levers 82, 84 are opened, the space between the sections 82a and 84a opens. A binding wire can then be inserted, for example, which is cut when the levers 82, 84 are pressed together between the cutting surfaces 82b, 84b.

So that the cutting surfaces 82b, 84b do not constantly meet when the one-hand clamp according to the invention only has to perform its clamping function, a stop can be provided between the actuating levers 82, 84,

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which maintains a certain distance between the levers and thus prevents the cutting surfaces 82b, 84b from coming together.

If the cutting function is to be used, the stop is removed and the actuating levers 82, 84 can be moved completely toward one another.

Different positions of the positioning device 18 of a one-hand clamp according to the invention are shown by way of example in FIG. 8. The positioning bracket 18 has the same position in relation to a pipe segment 70 of a component to be clamped, whereby a uniform clamping effect can be achieved in any case, which is already described in more detail above. The remaining parts of the tensioner 10 according to the invention are not affected by the alignment of the positioning part 18, but can be pivoted freely relative to the latter. 8a shows a pivoting of the positioning part 18 by 135 °, FIG. 8b shows a pivoting by 90 °, FIG. 8c shows a pivoting by 45 ° and FIG. 8d shows the 0 ° position. If the clamping quality remains the same, different space conditions can be taken into account, which is particularly important when the parts to be clamped are tightly packed

Offers advantages. The safe and simple one-hand operation is not adversely affected by different settings of the positioning device 18. The tensioning strap always fits optimally to the component to be tensioned. Deformations or forces on the component are reliably prevented.

Another significant advantage is that this tensioner has a variable ratio, which is formed by the fixed length of the lever arm 12 and the variable winding radius of the tensioner. Large-scale segments are assigned a correspondingly large transmission ratio due to the corresponding further tensioning tape processing and the resulting resulting smaller winding radius. Since larger segments require larger clamping forces, this results in an extremely positive effect in terms of optimized handling.

A tensioner according to the invention is preferably made of a non-rusting material for corrosion protection, for example a stainless steel, plastic or the like. This is a further advantage of the tool according to the invention in addition to the improved assembly quality, the universal usability and, above all, the one-hand operation.

C.

4 sheets of drawings

Claims (5)

673 614 1. tensioner (10) with an actuating part (12, 14) for an elongated clamping means (64) which can be shortened operationally between its ends by a one-way positively controlled actuating device (22, 24, 30, 40), one end of the Clamping means (64) are articulated on a retractor (22) and the other end section (66) of the clamping means can be fixed directly or indirectly on the tensioner (10). 2. Tensioner according to claim 1, characterized in that the clamping means (64) via a positioning part (18) from the retractor (22) can be guided. 2nd PATENT CLAIMS 3. Tensioner according to claim 1 or 2, characterized in that the retractor is designed as a drum (22) rotatable about an axis (20) of the tensioner (10). 4. Tensioner according to claim 2 or 3, characterized in that the retractor (22) is provided with a return device (26). 5. Tensioner according to claim 4, characterized in that the feedback device (26) is a spring device. 6. Tensioner according to claim 4 or 5, characterized in that the return device has a spiral spring (26) articulated on the drum (22) and / or axis (20). 7. Tensioner according to one of claims 1 to 6, characterized in that a (e) tooth lock (24) (ratchet) is provided for positive control. 8. A tensioner according to claim 7, characterized in that the teeth (24) of the ratchet are arranged on the circumference of at least one side window of the drum (22). 9. Tensioner according to one of claims 3 to 6, characterized in that the actuating device has two levers (12, 14) movable in opposite directions to one another about the axis (20) of the drum (22). 10. Tensioner according to claim 9, characterized in that the first lever (12) and the second lever (14) each having a pawl (40, 30) which can be actuated by a button (38, 28) and is associated with the tooth lock (24) are provided. 11. Tensioner according to claim 10, characterized in that the button or buttons (28, 38) are spring-loaded to the engagement position in the tooth ratchet (24). 12. Tensioner according to one of claims 9 to 11, characterized in that a compression spring (48) is provided between the levers (12, 14). 13. Tensioner according to one of claims 2 to 12, characterized in that the positioning part (18) is provided with a deflection device (54) for the clamping means (61), preferably for a deflection by approximately 90 °. 14. Tensioner according to one of claims 2 to 13, characterized in that the positioning part (18 relative to the retractor (22) is pivotable. 15. Tensioner according to one of claims 2 to 14, characterized in that the positioned (18) is designed to be clickable in stages. 16. Tensioner according to one of claims 9 to 15, characterized in that the one lever (14) in the region of the drum (22) is provided with a largely enclosing housing part (16). 17. Tensioner according to claim 16, characterized in that on the housing part (16) at least on one side locking recesses (56, 58, 60, 61) are provided with which a locking means (62) arranged on the inside of the positioning part (18) in Intervention can be brought. 18. Tensioner according to one of claims 9 to 17, characterized in that the levers (82, 84) are formed on their shorter sections with respect to the common bearing axis (86) with mutually opposite and mutually guidable cutting surfaces (82b, 84b). 5 DESCRIPTION