EP0937849A2 - Elongated arresting device comprising a braking sleeve with limited movement - Google Patents

Abstract

The elongated box-shaped profile (20) has a tapering orifice (21) into which fits a metal flat bar (10) moving longitudinally inside it. The flat bar passes through a short braking casing piece (30) which has at least one sloping braking surface matching the tapering orifice. The flat bar has a raised flat arm (11) starting at a distance from its attached end and for elastically widening the braking casing piece and for exerting braking force in the orifice of the box-shaped profile.

Description

The invention relates to an elongated catching device, as is required for tilting wings in addition to, for example, skylight openers, in order to prevent the wing from uncontrollably tipping out of the window frame and being damaged after being removed from the skylight opener (for cleaning the wing), or Causes injury to the user. Tilting casements must therefore be equipped with either a folding shear that already has such a safety gear, for example according to DE 81 36 723 U1 , or an elongated safety gear as described, for example, in DE 295 00 643 U1 ; see in the same training also the EP 723 058 A2 or DE 40 16 757 A1 (Geze) or the brake from DE 71 47 342 U1 that can be used for furniture fittings as well as the oldest "brake scissors" of GB 123,708 from 1919 to date.

Such safety devices should - since they represent additional components to the normal fitting of a tilting window - be inexpensive to manufacture , yet they should work precisely and remain reliable even over a long period of time . Due to limited storage and reduced costs, they should preferably be adjustable to different sash weights in almost the same construction.

The solution to the aforementioned problem can be found in claim 1, 16, 17 or 21.

The elongated safety gear has a box-shaped (elongated) profile and a longitudinally movable flat metal rod inserted therein, the Rod is slidable by a piece of brake jacket, which in turn is limited in the Profile is movable in the longitudinal direction between a tapered mouthpiece and a backstop. Will the rod and the profile, both together be the Form elongated safety gear (folding shears), telescopic pulled apart, the brake jacket piece moves with the movement of the metallic flat bar only decelerated with, so that it with the as a braking surface acting tapered mouthpiece by means of its slight expansion by means of of the raised flat web can exert braking effect.

Due to the mifführung a positive feedback is created which is limited to applies a stronger pull or a faster braking force when pulling faster.

The limited mobility of the brake jacket piece in the longitudinal direction leads to the fact that a release position and a braking position of this jacket piece is obtained. In the release position, the flat bar can be unimpeded and therefore smooth relative to Brake jacket piece are moved and thus also act telescopically without there is a braking effect between the two telescopic arms. Reached - while the extension movement that corresponds to the lengthening telescopic movement - the the flat web pressed out of the flat bar transversely to the direction of movement Brake jacket piece, so he takes it out of the short, limited way Release position with the braking position and it begins to deform elastically while at the same time the tapered mouthpiece the limited shift Brake jacket piece takes. In the braking position, the flat web creates power from the inside applied to the brake surfaces of the brake jacket piece (claim 17). This sits tight in the tapered and with a short web at the front end at least to the extent that the mouthpiece is not closed can emerge from the box girder profile, but has a braking effect.

Because of this design, the raised land area determines both the Time of application of the braking effect, i.e. the place where it is in the longitudinal direction spaced from the articulation point of the flat bar begins, as well as the height of the Braking effect due to its elevation oriented transversely to the direction of movement.

The brake jacket piece is elastic and surrounds it in an at least rear Base area completely the flat bar and thus creates a plain bearing for the Flat bar in the area of the mouthpiece and shortly before. In the area between the Storage and the front end of the mouthpiece are one-way brake flaps deformable transversely to the longitudinal movement and can adapt to the corresponding Adapt shaped, slot nozzle-like design of the mouthpiece and Apply braking forces from the flat bar to the mouthpiece. Will the Telescope arrangement then moved backwards, so that also moves Brake jacket piece back around the limited area and gives the unbraked and therefore smooth movement of the flat bar is free again, even if the raised one Flat web is still located in the brake piece (claim 19.20). But as soon as again a lengthening telescopic movement occurs, the brake jacket piece is around the limited short range shifted forward and immediately engages with its Brake flaps again in the mouthpiece area with the formation of higher braking forces.

The invention makes it possible to apply braking forces depending on the elongation to apply and then this braking force depending on the direction of movement do. A further elongation is opposed by a high braking force during a backward movement only a braking force at first is opposed, but then a smooth backward movement is allowed.

The high accuracy with which the braking forces can be defined are According to the invention paired with the ease of manufacture of the catching device. A drawn profile, which according to DIN may have relatively high permissible tolerance dimensions, according to the narrowed DIN 17615 even a range of ± 0.2mm from specified dimension may not become a definition over a longer distance of internal cross sections, so that the tolerances in the definition the braking force does not have the tolerances that the profiles allow according to their Have DIN tolerance. Rather, according to the invention, only the mouthpiece area in a narrowly limited length section, which for example be 1cm to 3cm cm long can, with a commercially available box profile, tapering on one or two sides rejuvenated and only in this area of rejuvenation by a press In terms of manufacturing technology can be done favorably, an inner cross-section is determined, which in addition, it is precisely specified by the press after one-time setup. Paired with this only short area on the box profile, a long survey in the Flat bar, which serves as a second telescopic arm, is provided. In the flat bar, the Elevation, which will usually be designed as a strip-shaped, uniform elevation, are pressed exactly, for example, by a press device, which at Flat steel much better DIN tolerances in the range of 6 / 100mm better can evaluate.

A braking effect is achieved between the elongated raised flat web, the above-mentioned brake jacket piece and the short, tapering mouth area of the profile, which despite its low-cost and fast manufacturing technology includes high accuracy, based on the semi-finished product commercially available, namely a flat steel and one for example made of aluminum hollow profile. After the exact braking forces that are applied depend on the tolerances and the accuracy of the elevation, the invention manages to set these braking forces more precisely than is still possible in the prior art, in which the box-shaped profile has generally been reshaped over a longer section is in its internal cross-section in order to allow a pair of brake shoes that are directly connected to the flat bar and move regularly over a long distance to take effect at a defined point on the flat bar (cf. DE 40 16 757 A1, column 2, line 50 or DE 90 07 788 U1, there claim 22 or EP 723 058 A2, there claim 19). Different here is the invention, which allows a piece of brake jacket only a narrowly limited movement in the longitudinal direction, which is fixed with respect to the profile and the point in time, i.e. the elongation of the elongated safety gear at which braking occurs, on the basis of the start of an elevation oriented transversely to the direction of movement on Flat bar defined, which is easier and more precise to form over a longer distance due to its small dimensional tolerances.

The braking range is therefore narrowly limited and is preferably at the front end of the box-shaped profile as a mouthpiece. The short braking area is good with techniques of Pressing or pressing, which allow inexpensive manufacture, and malleable Assembly of the braking device consisting of three elements is greatly simplified, due to the intended jacket and the associated one-piece design of the Brake jacket piece that can be placed as a cuff around the flat bar and with this is then inserted into the box girder profile, whereby the basic functionality is achieved. A first elongation movement provides for the fact that the brake jacket piece can fix itself in the mouthpiece and the braking begins. At this point, you can click one or two sides of the profile, locally behind the braking position of the brake jacket piece, the rear Stop position can be set as the release position of this jacket piece. Also one can Bore in the profile can be provided, through which a short screw is then screwed can be to set the rear stop of the brake jacket piece.

The accuracy of the set braking force also serves to coat the Flat bar is omitted. A stainless steel is preferred for this Flat bar used after the operation of pressing or pressing the elongated survey no longer receives additional coatings and therefore maintains its dimensions transverse to the direction of movement and also during it Cannot lose work. It should be noted that anodizing is already a Thickness change can bring the braking forces noticeable to significant influenced.

The rectangular base area of the brake jacket piece is the one that is the axial Provides leadership (claim 2.21); the lobes protruding from it serve the Braking in the mouthpiece of the profile. The same can be one or two oblique Have braking surfaces (claim 3). If a rectangular hollow profile is used, it is preferred to taper the wider sides in the mouthpiece, so that higher braking forces can be absorbed (claim 14). The one-piece Training the brake jacket piece enables its easy manufacture Plastic (claim 4). Here too, increased dimensional accuracy can be achieved if a Suitable plastic is used, which is also resistant to abrasion due to its function the braking should be due to friction.

The jacket piece has no separate springs to differentiate between Moving positions back and forth is therefore easy to install and possess Self-elasticity, from a flexibly tensioned or stretched (deformed) shape to return to its original shape when the raised web divides the interior of the Sheath piece not (more) enforced (claims 5, 6 and 19).

The safety gear begins its braking effect only when a noticeable Range of their elongation movement was carried out, i.e. at least 20%, in particular more than 50% of the length of the collapsed safety gear (claim 8). in the The first area, as long as the flat web does not penetrate the jacket piece, is the Safety gear smoothly (without braking) and only when the web in the Jacket piece penetrates and expands it transversely to the direction of movement, previously in the Mouthpiece shifted, the stiffness of the safety gear begins after Beginning in the further elongation area is retained (claim 9).

This braking force maintenance in the wider area can also be controlled if the Height of the web is changed. In this way, intermediate areas can arise that additionally Apply higher braking forces to add intermediate positions in the braking area mark, but it is also possible to define areas that are reduced Have braking power, for example, when the wing has a length section with high braking force has already been intercepted, then no more high forces apply and then the subsequent manual operation of the elongated To make the safety gear more favorable when the braking forces are reduced. This can be controlled by reducing the height of the raised flat web.

In terms of production technology, the control of the web height is staged or continuous with or easily possible without ramp areas; it is one of the Design freely accessible flat bar, which to its design none is subject to manufacturing restrictions and without any side Difficulties can be dealt with. The solutions of the State of the art (cf. DE 90 07 788 U1, DE 296 19 799 U1, DE 295 00 643 U1 and EP 723 058 A2), which suggest the difficult to access interior profile to edit.

It is not imperative that the flat web, raised from the flat bar is shaped out, in particular pressed out or pressed, a completely flat surface has, but it is advantageous if this surface as flat as possible and is as wide as possible, based on the maximum width of the flat bar (claim 11, 12).

By forming a central flat web on one side, on both sides On each of the long sides a footstrip is formed, the one on the opposite side Can press the brake jacket piece into the mouth section. To the specific The braking surfaces can do well on both sides to prevent surface forces from becoming too high be distributed, so each footstrip have about half the width of the flat web.

In addition to the shape for applying the braking force, there is also an increase Intrinsic stability of the flat bar is achieved due to at least two along running edges is stabilized. But also a curved surface of the Flat web, in the form of a semicircular cross section, fulfills the task of widening of the jacket piece in the mouthpiece area of the box profile and is therefore also suitable.

Figur 1

ist eine Seitenansicht, teilweise im Schnitt, einer langgestreckten Fangeinrichtung mit einem Hohl kasten-Profil 20 als erstem Teleskoparm und einem Flachstab 10 als zweitem Teleskoparm, der in Längsrichtung 100 aus dem Hohlkastenprofil herausgezogen werden kann. Gezeigt ist ein Mantelstück 30 unterhalb des Mundstückbereichs 21 des Hohlkastenprofils und zur Verdeutlichung ein Schnitt entlang der Ebene A-A.

Figur 2

ist dieselbe Fangeinrichtung von Figur 1, nur mit dem Mantelstück 30 in der Stellung, die der Bremsstellung entspricht und in der es von einem erhabenen Steg 11 durchsetzt ist, der es aus der in Figur 1 gezeigten Freigabestellung in die Bremsstellung verlagert hat. Auch hier ist in Figur 2 in der Schnittdarstellung in der Ebene B-B die Form sowohl des Flachstabes 10 mit seiner langgestreckten Erhebung 11, als auch die Andrückverformung des Mantelstücks 30 an der Innenwand des Mundstücks 21 des Hohlprofils 20 zu erkennen.

Figur 3

veranschaulicht eine perspektivische Darstellung der Figuren 1 und 2 mit dem Mundstück 21 und dem Flachstab 10, der aus ihm in x-Richtung herausgezogen werden kann und gerade das keilförmig zulaufende Bremsmantelstück 30 in den Mundstückbereich 21 gezogen hat. Die Erhebung 11 ist hier nicht dargestellt.

Figur 4

veranschaulicht gegenüber der Figur 3 deutlicher die Erhebung 11 im Flachstab 10, mit zwei Querschnitten längs der Ebenen C und D, entsprechend den Ebenen A,B von Figuren 1,2.

Figur 5a, Figur 5b

sind zwei perspektivische Ansichten des keilförmig zulaufenden Bremsmantelstücks 30 mit seinem Basisbereich 31, der den Flachstab 10 umgreift, und seinen zwei keilförmig zulaufenden Bremslappen 32,33, deren Außenfläche geneigt zu der Längsmittelebene des Flachstabes 10 ist, wobei aber der Durchtrittsraum 34 in etwa auf die Form des Flachstabes 10 abgestimmt ist und keine schräg verlaufenden Oberflächen aufweist.

The invention (s) are explained and supplemented below using several exemplary embodiments.

Figure 1

is a side view, partly in section, of an elongated safety gear with a hollow box profile 20 as the first telescopic arm and a flat bar 10 as the second telescopic arm, which can be pulled out of the hollow box profile in the longitudinal direction 100. Shown is a jacket piece 30 below the mouthpiece area 21 of the hollow box profile and a section along the plane AA for clarification.

Figure 2

is the same safety device of Figure 1, only with the jacket piece 30 in the position which corresponds to the braking position and in which it is penetrated by a raised web 11 which has shifted it from the release position shown in Figure 1 to the braking position. Here, too, the shape of the flat bar 10 with its elongate elevation 11 and the pressure deformation of the jacket piece 30 on the inner wall of the mouthpiece 21 of the hollow profile 20 can be seen in the sectional view in the plane BB.

Figure 3

1 illustrates a perspective view of FIGS. 1 and 2 with the mouthpiece 21 and the flat bar 10, which can be pulled out of it in the x direction and has just pulled the wedge-shaped brake jacket piece 30 into the mouthpiece area 21. The elevation 11 is not shown here.

Figure 4

illustrates the elevation 11 in the flat bar 10 more clearly than in FIG. 3, with two cross sections along the planes C and D, corresponding to the planes A, B of FIGS. 1, 2.

Figure 5a, Figure 5b

are two perspective views of the wedge-shaped tapered brake jacket piece 30 with its base region 31, which surrounds the flat bar 10, and its two tapered brake flaps 32, 33, the outer surface of which is inclined to the longitudinal center plane of the flat bar 10, but the passage space 34 approximately corresponds to that Shape of the flat bar 10 is coordinated and has no inclined surfaces.

Starting from FIG. 3 , it is clearest which function the elongated catching device, also called folding scissors, although it does not itself perform any angular movements, but can only be lengthened or shortened telescopically. Between the articulation point at the articulation end 12 of the flat bar, which is the first articulation point of the telescopic folding shear, and a second articulation point (not shown in the figures) at the left end of the box section 20 in FIG. 3 , the catching device is in the rebate space between a frame and a wing articulated. If these are opened, the telescopic arrangement becomes longer and, according to the example described, braking according to the extension length L, shown in FIG. 4, should begin. After this braking is applied, the braking force should be maintained so that an opening wing can be caught safely from a certain angular position and remains there, to which function, for simplification, reference is made to DE 90 07 788 (Geze); the function of a folding shear is explained there.

Oriented to a strip-shaped elevation 11 in the flat bar 10 of FIG. 4 , the cross sections are shown and can be seen without words, the elevation 11 extends at a distance from the first articulation point 12 and then continues to the end of the flat bar 10. The flat bar 10 is inserted into the hollow box profile 20 which is here shown as a rectangular profile with a narrow side and a longitudinal side and between the two telescopic arms 10,20 is called a braking collar 30, also brake sleeve piece 30, is provided, which is more apparent in shape from figures 5 . Before the elevation 11 according to FIG. 4 comes into effect, the telescopic arrangement according to FIG. 1 has such a position and function that the flat rail 10 can be easily pulled out of the hollow box profile 20 without noticeable braking forces and the brake sleeve 30 is applied to rear notches 23a, 23b remains. They block a further backward movement of the brake sleeve 30, but allow the forward movement of this sleeve 30 when the web 11 grips the rear end of the brake sleeve 30 with its front section 11a, which can be slightly increasing or rounded. The brake sleeve 30 is then moved into the position shown in FIG. 2 and the web 11 penetrates it, emerges at the other end and also moves out of the hollow box section and its mouth region 21. The longitudinal movement is denoted by x, a positive movement is upwards in FIGS. 1, 2 , a negative movement, corresponding to a reduction in the length of the telescope arrangement, corresponds to a movement of the flat bar 10 downwards or a movement of the hollow box section 20 upwards.

2 shows the limited movement stroke H, which is permitted for the brake jacket piece 30, between the release position defined by the notches 23a, 23b, in which no braking forces are applied, and the braking position leading into the mouth region 21. As an example, the stroke range H can be between a few millimeters and a few centimeters, based on a length of the brake jacket piece 30 of 1 cm to 2 cm and the mouth piece 21 of the same length.

The opening of the mouthpiece 21 has such a cross-sectional area that the rod 10 formed by the elevation 11 can emerge from the hollow profile, as can be seen in FIG. 2 , but the brake jacket piece is blocked at the outlet, that is to say the thickness of the plastic material is selected at least so that after reaching the front end position at height H no further longitudinal movement is possible. In addition, locking webs 24a, 24b can be provided at the end of the hollow profile 20, but are not absolutely necessary.

FIG. 2 shows how the braking forces are applied transversely to the longitudinal movement x of the flat bar 10. Starting from the two foot lines on the edge shown here, a strong force is applied to the center of the brake sleeve 30, which can be greater the wider the web 11 is made. If the flat web 11 has a differently designed height along its extension, the braking force can be controlled, starting with a low braking force up to an initially high braking force and then decreasing again and then remaining constant again, to simplify the further opening movement of the leaf by hand , against the reduced braking force. The initially higher braking force is used for safety and to catch the wing with increased angular momentum, corresponding to an increased braking force for catching the wing.

The notches 23a, 23b are strip-shaped indentations of the flat sides of the profile 20, they can be molded either on the narrower or the wider side of an exemplary rectangular profile, but they can also be replaced by an inserted screw 23c in order to be able to release the back stop again as Figure 4 illustrates.

In FIG. 5 , the replaceable brake sleeve 30 is shown more clearly in two three-dimensional representations. It has an interior 34 which is designed in accordance with FIG. 1 so that the flat bar 10 can be pushed through the brake sleeve 30 without the occurrence of frictional forces or with only slight frictional forces. Bevels, flats or any designs of the interior 34 are not necessary. Starting from a lower or rear base region 31, which corresponds to a rectangular jacket, encompassing the flat bar 10, two brake flaps 32, 33 are provided, which are triangular in cross section and run in the form of two lugs towards the mouthpiece 21, which is at the front end of the hollow profile 20 is arranged. The slope of the tabs 32, 33 is matched to the slope of the mouthpiece 21, so that the brake jacket piece 30 can be positively inserted into the mouthpiece 21, at least with its tab areas 32, 33, while the rectangular base area 31 remains in the untapered profile 20. The penetration of the web 11 into the opening 34 leads to the flaps 32, 33 widening and the flat pressing of at least one of these flaps against the mouthpiece 21 with its two inclined surfaces 21a, 21b. If only one inclined surface 21a is used, only one correspondingly inclined tab 33 can be provided, while the other tab 32 assumes the shape of the mouthpiece 21 on the other side, corresponding to page 21b of FIG. 3 .

During a movement -x in the direction of the telescopic device being pushed together, the base region 31 strikes the screw 23c shown as an example in FIG. 3 , which is only let into the wall of the profile and projects only slightly inwards. It corresponds to the rear brackets 23a, 23b of FIGS. 1, 2 .

The plastic material from which the brake sleeve 30 is made corresponds to the Braking effect requirement and therefore has increased abrasion resistance, but has nevertheless elasticity to the flaps 32,33 flexible around the crease line To be able to pivot base region 31 and also elastic on the Expansion forces of the web 11 to be able to react and one across Direction of movement x applied braking force. The angle of the Brake flaps 32, 33 with respect to the central plane of the flat bar 10, corresponding to the The central plane of the opening cross section 34 is between 5 ° and 15 °, corresponding to the Inclination between 5 ° and 15 ° of the mouthpiece surfaces 21a, 21b.

Claims (21)

Elongated safety gear for a wing, such as a tilting wing or flap, for installation in the rebate between the wing and a frame, which safety gear (a) an elongated box profile (20) with a tapered mouthpiece (21) and an inserted therein, longitudinally movable flat metal rod (10) which extends through a short brake jacket piece (30; 31,32,33) which at least one on the has tapered mouthpiece (21) matched sloping braking surface (32,33); (b) wherein the flat bar (10) has a raised flat web (11; 11a, 11b) which begins at a distance (L) from its articulation end (12), for elastically expanding the brake jacket piece (30) and exerting a braking force in the mouthpiece (21 ) of the box profile (20). Safety gear according to claim 1, wherein the brake jacket piece (30) two has opposite brake jacket flaps (32,33) by a rectangular base region (31) protruding in the longitudinal direction (100) and one in each case obliquely to the central plane of the flat bar Have braking surface. Catching device according to one of the preceding claims 1 or 2, in which the Brake jacket piece (30) one or two oblique braking surfaces has, which with respect to the central plane of the brake jacket piece (30) or Flat bar (10) have an angle of between 5 ° and 15 ° inclination. Safety gear according to Claim 1, in which the brake jacket piece (30) is in one piece or is formed in one piece, in particular from an abrasion-resistant Plastic. Catching device according to claim 2, wherein the brake jacket piece (30) in Base area (31), but in particular also in the flap area (32, 33), one in Has constant internal cross-section in the longitudinal direction to pass through Flat bar (10) without internal inclined surfaces on the inner surfaces of the Brake jacket piece (30). Catching device according to claim 1, wherein the elasticity of the Brake jacket piece (30) is inherent flexibility that the brake jacket piece on returns its normal - unloaded - dimension when the sublime Flat web (11) of the flat bar no longer in the brake jacket piece (30) intervenes. Catching device according to claim 1, in which on the profile (20) and the Flat bar (10) at the free end of an attachment device a pivotable attachment of the catching device at a pivot point of the Wing or frame is provided. Catching device according to claim 1, wherein the distance of the beginning (11a) of the Flat web (11) from the articulation end (12) more than 20%, in particular more than 50%, the length of the collapsed safety gear. Catching device according to one of the preceding claims, in which the flat bar is designed such that it is practically unbraked and therefore easy to move longitudinally in the telescope area up to the start of the web (11); he experiences a strong braking effect when the telescopic area is reached in which the flat web engages in the brake jacket piece (30) and presses it into the mouthpiece (21) of the profile (20) and presses it at least in the web area transversely to the direction of movement. Catching device according to claim 1, wherein the raised flat web (11) is a Height in the range of 2/10 to 5/10 mm compared to the just remaining remaining surface of the flat bar (10). Catching device according to claim 10 or 1, wherein the flat web (11) a Width from 10% to 80%, in particular between 40% and 60% of the width of the flat bar (10), preferably so that on both sides of the Flat bar (19) project substantially the same area widths, so in essentially each 25% footer width on both sides of the 50% of the bar width engaging flat web (11) on the opposite of the foot strip Side of the flat bar (10). Catching device according to claim 1 or 11, wherein the raised web (11) a has such a width that its surface becomes clear in the transverse direction extending, flat surface strip. Catching device according to one of claims 10 to 12, wherein the Flat bar (10) made of a non-rusting, not anodized and also not otherwise coated steel. Catching device according to claim 1, wherein the mouthpiece (21) two for Center plane of the box section (20) is inclined Has wall segments (21a, 21b), in particular the wider sides of a Rectangular profile. Safety gear according to claim 1, in which the brake jacket piece (30) between the front end of the mouthpiece (21) and one in Longitudinal direction (100) slightly behind the mouthpiece (21) Release position in the longitudinal direction (only) has limited movement (H), in particular in the release position at the end area of the brake jacket piece (30) on Box profile fixed locking piece (23a, 23b, 23c) attacks another Block longitudinal movement of the jacket piece. Elongated telescopic folding scissors, suitable for absorbing the forces of a moving weighted wing, such as tilting sash of a window, and for installation in a rebate between the wing and a window frame, which scissors have an elongated hollow profile (20) and a longitudinally movable flat bar inserted therein (10) which extends through a brake jacket piece (30; 31,32,33) with at least one inclined braking surface (32) which is matched to a tapered mouthpiece (21) of the profile (20), the flat bar (10) being one at a distance (L) from its articulation end (12) beginning, raised flat web (11; 11a, 11b) for the elastic expansion of the brake jacket piece (30) and exerting braking forces in the mouthpiece (21). Elongated, telescopic folding shears for the gentle braking of an opening movement of a wing, in which a first telescopic arm with a pivot end (12) is designed as a flat bar (10) which is longitudinally movable in a second telescopic arm (20) in order to move between a fully extended and to be moved longitudinally in a fully retracted position, a strong braking effect being exerted between the two telescopic arms (10, 20) between the two positions, only significantly delayed after the start of a telescopic elongation,
characterized in that the braking force is exerted by a brake sleeve (30; 31, 32, 33) which is held to a limited extent between a release position and a closely adjacent brake position (H) and which starts at a significant distance from the articulation end (12) and in the longitudinal direction (100) extending elevation (11) in the flat bar (10) is taken from the release position into the braking position (x) and applies the braking force there after passing through the elongated elevation (11). Folding shears according to claim 16 or 17, wherein the limited movement between a conical stop (21) of the second profile Telescopic arm (20) and a blunt, in particular removable Back stop (23c) runs. Folding shears according to claim 16 or 17, in which the brake boot (30) immediately from the braking position to the release position is moved back against the elongation movement (100, x) when the Flat bar (10) begins to be telescopically pushed back and the takes the brake sleeve (30) which is resiliently attached to it again. Folding shears according to claim 16 or 17, in which the limited Freedom of movement (H) of two adjacent stops (23a, 23b; 23c; 21a, 21b) on the second telescopic arm (20) for the brake sleeve (30) is provided. Plastic brake jacket piece (30) as a spare part of a catching device according to claim 1 or a folding shear according to claim 16 or 17, in which (a) protrude from a rectangular base region (31) at least one, in particular two, brake flaps (32, 33), which extend obliquely to the central plane of the casing piece, in the direction of the central plane of the brake casing piece; (b) a cavity (34) is provided between the brake flaps and in the base region (31, 32, 33), which has a practically identical cross-section in the direction of the central plane, for expanding the brake jacket piece (30) by accommodating a flat bar (19) in the cavity (34).

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