DE2045107A1 - Insert into a hole and fixable connection or holding insert in it - Google Patents

Description

20451

95-1.6.084ρ (ΐβ.085Η) 9/11/1970

Patent attorneys Dlpl.-lng. R. BEETZ sen. . Dlpl.-Ing. K. LAMPRECHT

Dr.-Ing. R, Θ EETZ Jr. 8 Munich 22, Steinsdorfstr. 10

ADBAR (Patent Co.) LTD., 18, Central Chambers

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Stratford-upon-Avon, Warwickshire (UK)

Insertable in a hole and fixable connection or holding insert

The invention relates to one in a bore insertable and fixable in it connection or holding insert, such as a screw, a pin, a Threaded nut or the like_

The usual connecting or holding inserts that can be fixed in bores in components are threaded elements with λ

for example have a nut thread or a bolt thread with a mating thread for connecting or holding purposes cooperates; they are widely used in metal or plastic parts, as well as parts made of other materials.

The invention is based on the object of creating a connecting or holding insert that can be inserted in a bore,

95-Ref. 4279-LpPl (7)

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which has a simple and inexpensive to manufacture form, which can be firmly and quickly inserted and which in particular has a high level of stability against attempts to pull it out of the bore. The one in this regard The advantages achieved will emerge from the following description of the connection "or retaining insert" according to the invention

The connection or holding insert according to the invention, which can be inserted into a bore and can be fixed in it, such as a screw, pin, Threaded nut or the like. Is essentially characterized in that the insert body at least in its in the Bore insertable part tapers from the insert end P and the insert body one in the inwardly narrowing Circumferential gap between the tapered insert part and the wall of the bore can be driven in and thereby radially expandable or socket is assigned as a wedging element.

To explain the invention, some exemplary embodiments will now be described, which are shown in the drawing. are illustrated. Show it:

Fig. 1 partially in section the components of the

connecting or retaining insert according to the invention, before installing the insert;

* Fig. 2 is an axial section through the in a bore

specified stake;

Fig. J5 is a side view of the insert with its Wedge bushing;

Fig. 4 shows a bolt insert fixed in a bore

Flg. 5 a nut insert for. Acceptance of a long bolt thread;

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Pig. 6 shows an axial section through a different one Execution of the holding insert. ■

In the figures of the drawing, the same parts are denoted by the same or corresponding reference numbers.

The holding insert shown in FIGS. 1 and 2 consists of an insert body 1 and a sleeve or socket 2. The insert body 1 is designed as a truncated cone 10 on the outside, which tapers upwards from the (lower) insert end. the insert body comprises an internally threaded bore 11 for receiving a threaded bolt or a corresponding thread, while the sleeve or bushing 2 preferably has a longitudinal slot 20 up%, so that it can relatively easily expand radially. The sleeve or socket has a cutting edge 21 or a corresponding inner bevel at its front end.

In one way of inserting the insert body 1, it is inserted into a hole 3 previously drilled to a suitable diameter in a component 4, the larger end of its truncated cone part being inserted into the hole up to its base. The front end of the slotted sleeve or socket 2 is then attached to the periphery of the smaller diameter part of the insert body 1 (Fig. 1) and driven under axial pressure, where it penetrates completely g into the bore 3 and when pushed over the Truncated cone 10 of the insert body 1 widens radially (Fig. 2). When the sleeve or bushing 2 is driven in this way into the annular gap between the insert body 1 and the bore 3, its cutting edge 21 shears or separates material from the wall 30 of the bore 3; the cut-away material is displaced towards the inner part 31 of the annular space between insert body 1 and bore 3 and compressed there with high pressure. At the same time, the sleeve or socket 2 also assumes a truncated cone shape with an outer inclined conical surface 22 and the inner wall 30 of the bore 3 becomes

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cut out correspondingly conically to form an inwardly widening hollow cone jacket J> 2 . As a result of such a frustoconical working into the material of the basic component, both the sleeve or bushing 2 and the connecting or retaining insert body 1 are firmly wedged in the bore 3, so that they resist even very high loads acting on the connecting or retaining insert body 1 exert a pulling force in the sense of pulling it out of the hole J5. In practice, the angle of the outer truncated conical surface 10 of the insert body 1 is in the order of magnitude of 5 J can be customized.

Depending on the type and properties of the material of the basic component 4, the expansion of the sleeve or socket 2 into the truncated cone shape can mainly or completely cause a corresponding displacement or deformation of the material on the borehole wall JO , in which case the wedging with the borehole wall by positive locking he follows.

The sleeve or socket 2 is preferably down to below the outer surface of the component Λ using a EintrSebwerkzeuges 5 driven, at least at his front working end is tubular. It is found to be useful to use such a tool with which the Inserts very quickly either by handwork or using automatic devices in the form of a press or machine can be installed.

In Fig. 2, the sleeve or bushing 2 is shown in a position sunk within the base material, i.e. H. below a short upper part 12 at the smaller end of the diameter bounded by parallel surfaces or a cylindrical surface of the insert body 1. If the bushing 2. only over the smaller diameter end of the Retaining insert body 1 can be pulled when this element

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is inserted into the bore 3, can be for the purpose of simpler Handling also insert the insert body 1 and the sleeve or bushing together as an assembly into a bore 3, d. H. the parts are put together beforehand. This also applies to packaging and storage in the material store as beneficial. The front end edge 21 of the sleeve or socket 2 can have the smaller diameter of the Insert body 1, such as a short parallelepiped or cylindrical part 12 at the outer end with a Friction fit are placed, which is sufficient to hold the insert body 1 and the sleeve or socket 2 together. This assembly can then be inserted into a bore 3 and then the sleeve or socket 2 in the previously described position Way to be driven.

In a different arrangement of such a prepared one The assembly is the sleeve or socket 2 releasably on the insert body 1 (Fig. 3) placed where it is due to its own elasticity over the outer end of the truncated cone 10 of the insert body 1 contracts that the rear end 23 of the sleeve or socket at the constant diameter executed insert body part 12 for the purpose of holding the socket 2 on the insert body 1 under tension. if For the installation of the connecting or holding insert the socket 2 is to be removed, this can be easily achieved; but you can also use the insert body 1 and socket 2 existing assembly is initially jointly in a hole 3 introduce, the frontal cutting edge 21 of the somewhat elastically widened sleeve or socket 2 itself initially supported on the material of the component 4 on the circumference of the bore opening 3. By a suitable driver or a similar tool can then insert the insert body 1 through the socket 2 in its entirety or up to the stop driven into the bore 3; then one drifts then, if necessary, after moving the Insert body 1 somewhat contracting sleeve or bush 2 a. Especially for this type of application or arrangement

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of the assembly, the sleeve or socket 2 can already be designed in the form of a slightly conical envelope in the untensioned position.

In FIG. 4, the arrangement and the manner in which the insert body 1 and the sleeve or socket 2 are installed are the same as previously described; only is the insert body 1 with a preferably threaded bolt or Connected pin, which is used as a screw-in part for receiving a

en) Threaded nut or another one provided with an Xnn thread Component is used.

In the particular arrangement according to FIG. 5, the insert body 1 provided at its insert part with an extension 15 of prismatic or cylindrical design, whose The outer dimension corresponds to the diameter of the wider end of the truncated cone part of the insert body 1 and at the same time that Diameter of the hole 3, which is to receive the insert body. The extension can - depending on the total length of the insert element - have any desired length, which is necessary, for example a length that allows proper centering of the insert body 1 in the bore 3 secures.

The different embodiment according to FIG. 6 shows a radially expandable bush 2a, which is internally conical, and its Inner wall surface 24 with the outer wall surface of the cone shell part 10 of the insert body 1 cooperates when the sleeve or socket 2a is expanded. This sleeve or socket has a essentially constant outer diameter, but their outer surface can be corrugated, with edges or teeth 25 provided or similarly shaped with projections and / or depressions to fit into the inner wall to press or firmly press the bore 3, which receives the insert or the holding element. In certain cases

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it proves to be useful if the outer surface of the Bush or sleeve 2a also has a conical shell shape or assumes such a shape when used; this socket can naturally also exert a shearing or chiselling action, as is the case for the sleeve or bushing 2 of the arrangement according to FIGS has been described; these combinations represent favorable 'further developments of the invention.

So that the sleeve or socket 2 or 2a can be easily expanded, it has an axial slot 20, as already described; this slot 20 engages the base material of the bore wall and penetrates with its edges, so that the sleeve or I Bush a rotation of the fixed retaining insert body y-l in hole J opposes. The sleeve or socket 2 or 2a, however, does not have to be slotted, it can also be selected in such a way that it is only differentiated by its deformation converts to a frustoconical shape when on the conical surface of the holding element 1 is driven into the bore J will.

For most practical purposes, the holding insert body 1 and the sleeve or socket 2a are designed with a circular cross-section; However, it should be readily apparent that both the insert body and the sleeve or socket may have a similar non-circular shape cross-sectional shape, that is elliptical, square, hexagonal, or may have a cross-section at all, which is irregular. In addition, and for special purposes, the holding element 1 and / or the sleeve or socket 2a can also be made of other material, such as a plastic material, instead of a suitable metal; this is particularly recommended when electrical or other insulation is desired, but also in special cases for better interaction with the material of the basic component 4.

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Thus, the holding insert body 1 can in particular be made of plastic or other insulating material when it to accommodate a metal screw; In this case, the threaded bore 11 would have to be closed at its inner end or a Be a blind hole, but you can also use a plastic holding insert body 1 around a metal bolt or pin similar Fig. 4 shape or press around to the desired, for the Use appropriate conical or truncated pyramid shape to have.

Finally, it should also be clear that the threaded bore 11 or the shaft 14 of the connecting or retaining insert body 1 consist of solid material, or may otherwise be suitably shaped, according to the particular Requirements of fastening or fixing, and that also other deviations within the scope of the invention possible are.

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Claims (1)

Claims 1. Insertable into a borehole and fixable connection or retaining insert, such as screw, pin, threaded nut or the like, characterized in that the insert body (1), at least in its part which can be inserted into the bore, is sicß from the insertion end from tapered and him a in the narrowing after them gap between the insert body and the appropriately shaped wall of the bore (35) which can be driven in and thereby radially expandable sleeve or bushing (2) as Wedging organ is assigned. 2. connecting or holding insert according to claim 1, characterized ■ characterized in that the sleeve or socket (2) has an outer tapering contour (22) when it is over the insert body (l) is widened, 'and with inclined or conical surface contact (22,32) rests firmly against the inner wall (^ O) of the bore (3). j5. Connecting or holding element according to Claim 1 or 2, characterized in that the sleeve or bush (2) has a cutting edge (21) at its driving end which allows material to be removed from the V / and (350) of the bore (3) Cut out or shear off the component (H) containing the bore until wedge contact of wedge surfaces (22,352) is achieved in the region of the bore wall. H-. Connecting or retaining element according to any one of the preceding claims, characterized in that the sleeve or bushing (2) is suitable for being fixed around or on the insert body (1) when the two parts are in front of and as a coherent assembly handled during deployment. 10 9815/1368 -ίο- 2Q451Q7 5. connecting or holding element according to any one of the preceding claims, characterized in that the The sleeve or the socket (2) is already designed in the shape of a pyramid or a cone shell in the unstressed state. 6. Connecting or retaining element according to any of the preceding claims, characterized in that the outer peripheral surface of the sleeve or bushing (2a) through Corrugation, serration or by working on projections (25) that allow better frictional or shear engagement in the Wall (j50) of the receiving hole (3) or a form fit is deformed. 109815/1368