DE2548544A1 - Fastening outer thermoplastic sleeving to Bowden cable - by limiting sleeving wall thickness and impressing shallow point impressions - Google Patents

Abstract

Plastic coverings e.g., hollow sleevings are fastened by pressing onto flexible load-bearing sleeves such as the plastic sleeves for Bowden cable. The surrounding outer sleeving is reduced in wall thickness at one part or for one particular length, where pressure is applied, to produce >=1 shallow circular impressions and to be transmitted right through to the inner wall of that outermost sleeving. Good bonds, without damaging or distorting the internal polymer-covered metal/Bowden cable are obtd.

Description

Moving from tightening to be carried out by pressing

place surrounding parts made of plastic on an internal one Part.

The invention relates to a method of fretting Fixing of surrounding parts made of plastic, such as hollow-cylindrical, slide-on parts Parts made of plastic, ao or primarily on the casing of flexible devices for transferring movement forces, especially Bowden cables, where a cover with end pieces made of plastic, into which the casing snaps, is connected, and a connection effected according to the method.

Compounds of the type concerned by the invention can be found, for example in the case of Böwden trains, which are intended, for example, for motor vehicles, machines and the like which the soul of the train can be moved in a flexible spiral hose made of metal wire is and the spiral hose also with flexible and elastic plastic, may be encased, or similar flexible devices for transmitting Tensile and compressive forces with a plastic cover.

The train or motion transmission device must be regular 3. B. provided with end pieces at the ends of the hose in the sheath are, for example, the attachment to a fixed dashboard or the stationary housing of an encoder or stationary slave are used, with the ground pieces can consist of plastic, among other things. At HEller or, Seilzüge, it is often necessary a part made of plastic at a point between the ends of the cover, E.g. a plastic carrier to be attached.

Because the surrounding plastic part is not pressed onto the shell is possible, the procedure has so far been that around a protruding hub Part of reduced wall thickness or reduced outer diameter of the surrounding Plastic part of a ring band, preferably in a polygonal, isosceles design placed the outer and inner circumference and this ring band against the hub-shaped Part was compressed.

For economic reasons alone, this type of stipulation is little expedient; because the ring band represents an additional part, the same thing it is a cheaper item, undesirable to manufacturers height Costs are derided by the ring'oand as a part of the mass, viewed as a whole, the total cost increases very noticeably for production. The ring band also requires additional Performing work to fix it, it is therefore one of the solutions pending problem, an effective, simple and cheap, no additional material conditional and requiring only a few work tasks to carry out the to create the connection mentioned at the beginning.

The solution to this problem is the primary object of the invention.

According to the invention, this solution essentially consists in that the surrounding part made of plastic In the surrounding path at least one Place or on a section of the route in its thickness reduced to a wall thickness with which an indenting pressure, especially in the form of small pressure areas, to a relatively shallow depth to the inner wall of the surrounding part or propagates to the surrounding part, and that is reduced in the distance Thickness of dents or pocket extinguishers from relatively small diameter to relatively be indented to a shallow depth.

If the wall thickness of the surrounding part made of plastic from the outset does not have any strength exceeding the stated measure, then one is of course special it is not necessary to reduce the wall thickness.

It has been shown, surprisingly, that the inventive Formation of the surrounding part with only a few, as it were, punctiform indentations - it can already be sufficient - relatively shallow depth an immensely solid, sufficient determination with simple work processes that result unintentionally does not cancel. An additional cost of materials and more or less expensive No work is required.

The good fixing effect may be explained by the fact that the to a certain extent only point-wise pressing, or. Compression deformation against the surrounding envelope or such a molding is connected to this with a flow of the material and such flow of material results in intimate clamping of the surrounding body takes place, resulting in a durable and resilient Fixing is connected to the surrounding plastic part, the fixing of the permanent Deformation of the surrounding plastic is accordingly permanent.

Another advantage of the new method is that the definition despite their first names by means of printing to no damage or a reduction in diameter vzw a plastic-coated metal tube. Metal hose and thus to one Can lead to impairment of the operability of the device, there the plastic provides sufficient evasive options in the deformation up to the saturation position Has-.

The plastics used have a certain plasticity Deformability and are preferably thermoplastic plastics. Thermosets are not suitable for the invention.

The pressure to be carried out at specific points or

Formation can also be carried out several times, seen in the circumferential direction will. This is particularly recommended when the diameter is larger Also, according to the invention, the indentations, seen in the axial direction, possibly in connection with multiple point-like contact pressure in the Seen circumferential direction, mirfeuii can be made.

Mainly with thick-walled or thick-walled surrounding plastic parts d can also be done in such a way that they are preferably in the middle of their Length to a double truncated cone with the smaller surfaces standing upside down Cones and a connecting piece located between them of the requested Deformed wall thickness and made the impressions in this connector will.

A part made of plastic and fixed in the method according to the invention can be designed so that the surrounding plastic part is preferably in the middle its length to a double truncated cone with the smaller surface facing each other Cones aged, and that between them a hollow one Connector of the desired reduced wall thickness is provided, and that in this connector the press-fit is provided.

The drawing illustrates various exemplary embodiments Invention.

Fig.1 and 2 leave a first exemplary embodiment in longitudinal section and recognize in frontal view.

Fig. 3 and 4 show an embodiment with in the circumferential direction and molded or pressing points increased in the longitudinal direction.

Fig. 5 to lo illustrate further embodiments in longitudinal and frontal and cross-sectional views.

In Fig. I and 2, 1 denotes a shell in the form of a tightly wound Wire spiral, which is provided with a plastic casing.

The sheathing of the wire spiral is made of plastic, for example based on PVC. The envelope is e.g. for fastening purposes a tubular or cylindrical body 2, which is also made of thermoplastic plastic, appliedw The wall thickness of part a is not greater than that aimed at by the Propagation of a pressure exerted on the outer periphery of the part 2 at one point is determined up to the plastic coating of the wire hose.

Part.2} is defined on the plastic casing by pressing in the dent-like depressions 3 which are relatively have only a small depth.

By pressing in the indentations, the result is a full, all-round, tight Enclosing the envelope, which in some respects is also related to the indentation can participate. As a result of the pressure in places, something flowing occurs, so to speak Nla'e-ri21s into the areas on which no pressure is exerted, with the result of lush enclosing.

In the embodiment according to Figs. 1 and 2, there are two: s) i opposite sides a dent-like indentation imprinted in the longitudinal direction seen, are offset from one another, but are otherwise diametrically opposed.

In Fig. 3 and 4 the end of the plastic 6 Sheathed spiral hose with a cap-like end piece 7 made of plastic. There are three dent-like depressions 8 impressed in two places. The three dent-like Wells are offset by 10 to each other at each of the locations.

Fig. 5 and 6 show an embodiment in which the with Plastic-encased train 9 passes through the plastic part to be fixed on it. The '.. part lo has a hub-shaped projection 11 with which it is attached to the plastic wrapped train 9 is set by adding in the approach to each 900 displaced Dent-like depressions 12 are pressed in.

In Fig. 7 and 8 is in the part to be fixed 13 made of plastic provided in a recess or recess 20, through which the part the shape of a double cone or a double truncated cone whose single cone 14 and 15 with the smaller surfaces facing one another and via an intermediate piece 16 cylindrical shape are connected to each other. In this intermediate piece.

the dent-like depressions 17 are pressed in crosswise.

The end. Fig. 9 and lo there is a plastic-coated train 9g of it End is provided with a closed cap 18 made of plastic, which is through a Dent-like recess 19 is set.

Claims (6)

P a t e n t a n s p r ü c h e. 1.) Movement of the surrounding by pressing Parts made of plastic, such as hollow-cylindrical, snap-on parts made of plastic, on the surrounding part, so or primarily on the Uiri envelope of flexible devices for the transfer of forces, such as the plastic-coated hose of Bowden cables, characterized in that the surrounding part made of plastic (2, 7,10,13,18) in the surrounding route at least at one point or on a part of the route in its strength is reduced to a wall thickness in which a cell, especially in a circular shape of smaller diameter and on a relatively shallow depth indenting pressure up to the inner wall of the surrounding part or up to on the, surrounding part - propagates, and in the stretch diminished strength dents or bag extinguisher of relatively small or smaller diameter be depressed to a relatively shallow depth. 2. The method according to claim 1, characterized in that the impressions, seen in the circumferential direction, several times, preferably at the same distance from one another be made. 3. The method according to any one of claims 1 and 2, characterized in that that the impressions, seen in the axial direction, are made several times. 4. The method according to any one of claims 1 to ,, characterized gekennzeichcet, that is in particular s walled surrounding parts made of plastic, preferably in the middle length, to a double truncated cone with the smaller blade head on head standing cones and a connecting piece located between them from the The desired wall thickness is deformed and the indentations into this connecting piece be made. 5. In the method according to any one of claims 1 to 4 specified Part made of plastic, characterized in that a surrounding part (2,7,11,16, 18) in a hollow-cylindrical shape, at least on one section of the route, has been reduced by as much Wall thickness shows that a point-like indentation, i.e. an indentation or an impression of a relatively small diameter and to a relatively shallow depth to the surrounding part (reproduces, and & ß diminished in this part Diameter of individual dent-like impressions of a relatively small cross-sectional area and are provided of relatively shallow depth. 6. Plastic part according to claim 5, characterized in that the Plastic part (13) preferably has a double truncated cone in the middle of its length (13) with the smaller surfaces facing cones (14,15), and that between these a connection piece t16) from the geshnschtentver-wrestle Wall thickness is provided, and that in this connecting piece (16) the impressions (17) are provided.