DE102011110120A1 - Irreversible screw connection element e.g. screw, has carriers designed such that tool e.g. adapter, slides against tightening rotational direction of carriers, where engagement surfaces of carriers are defined in same direction - Google Patents

Abstract

The element has sequential carriers (2) provided at a head (10) of the element, where the carriers extend axially and circumferentially and screwing process is enabled in tightening rotational direction (100). The carriers are designed such that a screw connection element turning tool e.g. adapter, slides against the tightening rotational direction of the carriers. Engagement surfaces (2b) of the circumferentially spaced carriers are defined in the same direction. The head of the element is designed conically. An independent claim is also included for a tool.

Description

Technical area

The invention relates to a novel irreversible screw connection element (screw or nut) which is provided with a thread. Specifically, the invention relates to a particular embodiment of the head of a screw connection element in a with conventional tools no longer releasable design and a corresponding tool for irreversible screwing of the connecting element. The invention finds its application in the entire field of glands that can not be solved without destruction.

State of the art

According to the prior art, irreversible screw connections in the form of tear-off nuts or tear-off screws are already known. Abreißmuttern and Abreißschrauben have between a threaded part for producing a screw connection and a head for the form-fitting attachment of a tool on a predetermined breaking point. To produce an irreversible screw the head is overstressed after tightening the threaded part by applying an additional torque at the predetermined breaking point and turned off. The predetermined breaking point can then be smoothed or compressed. Usually, the upper part of the nut or the screw head is designed as a hexagon, which passes over a strong slimming, which serves as a predetermined breaking point in a circular base; This socket then represents the no longer detachable part of the screw.

The disadvantage of this technique is that in the principle of the Abrisstechnik the upper part of the mother or the screw head is obtained as scrap. In addition, corrosion problems arise at the predetermined breaking points.

Presentation of the invention

The present invention is based on the object to provide an irreversible screw connection element, which is no longer to be solved in a non-destructive way.

According to the invention the above object is achieved with the features of claim 1. Advantageous embodiments of the screw connection element according to the invention are specified in subclaims.

Thereafter, a screw connection element of the type mentioned above is characterized in that axially extending and circumferentially successive followers are provided at the head of Schraubverbindungselements, at the circumferentially sense rectified attack surfaces by using a suitable tool for powering the screwing in tightening direction is made possible, wherein the driver such are configured such that the tool slides against the tightening direction of rotation of the drivers along in such a way that a power transmission is prevented by the tool on the screw connection member against the tightening direction.

The no longer to be solved screwing is achieved according to the invention by the special shape of the screw head and the mother. The attack surfaces of circumferentially arranged drivers are all rectified in the circumferential sense, therefore, point in the same direction on the circumference of the cone. On the other hand, in the direction opposite to the direction of the circumference, the drivers are bevelled flat and preferably smooth, so that they do not form an attack surface in these regions. The flat slopes of the drivers can be straight or curved.

Such a shape and orientation of the driver has the advantage that they thus act in a particularly favorable manner as a kind of barbs, but in the opposite direction of rotation of a tool against the tightening direction against it provide no attack surface.

In a very particularly advantageous embodiment of the invention, the head of the screw connection element is designed conical. The conical design eliminates the use of normal tools such as a wrench or pliers to prevent unwanted loosening of the threaded fastener.

In a further embodiment of the invention, an adapter is provided, by means of which the screw connection element can be screwed non-positively in the direction of rotation over the driver. Due to the special arrangement of the driver, a power transmission is therefore possible only in one direction.

With this solution, in contrast to the demolition principle, there is no waste, which causes further costs. There are no corrosion problems as at the break points. Due to the loss of material in the demolition principle still results in the advantage of lower material usage at comparable size of the screw connection element.

Brief description of the drawings

Other objects, features, advantages and applications of Schraubverbindungselements invention will become apparent from the following description of an embodiment with reference to the drawings. All described and / or illustrated features, alone or in any combination form the subject matter of the invention, regardless of the summary in individual claims or their dependency.

In the drawings show

1 the screw connection element in a preferred embodiment;

2 a nut in the embodiment of the screw connection element according to the invention;

3 a tool for irreversible screwing the screw connection element.

Embodiment of the invention

In the 1 illustrated advantageous embodiment of the invention shows a screw connection element 1 in a particularly preferred embodiment. The head 10 the screw connection element 1 is here - as described above - designed conical. Below the head is a thread 11 intended.

The flat slopes 2a the driver 2 are formed arched in the illustrated embodiment.

The invention further relates to a special tool 20 for tightening the screw connection element according to the invention 1 which is in 2 is shown. The tool has inside according to the drivers 2 at the screw connection element 1 corresponding recesses or depressions, which is a force transmission to the screw connection element 1 in a tightening direction 100 allow.

The screw connection element according to the invention 1 Can be used with all types of screws and nuts. Nuts can be made in all sizes and in metric and inch sizes, such as stainless steel, copper, ceramic, plastic such as nylon, etc. In addition, the screws can be made in all known shapes and materials.

100 shows the tightening direction in the illustrated embodiment of the screw connection element. This can when directionally opposed arrangement of the driver 2 Of course, also in the opposite direction, for example, in a left-hand thread.

The screw connection element according to the invention 1 is not limited in its execution to the above-mentioned preferred embodiments. Rather, a variety of design variations are conceivable, which make use of the solution shown even with fundamentally different type of execution.

LIST OF REFERENCE NUMBERS

1

threaded fastener

2

takeaway

2a

flat slopes

2 B

working surfaces

10

head

11

thread

12

Internal thread of the nut

20

Tool

100

Tightening direction of rotation

Claims (7)

Irreversible screw connection element ( 1 ), which with a thread ( 11 ), characterized in that at the head of the screw connection element ( 1 ) axially extending and circumferentially successive driver ( 2 ) are provided at its in the circumferential sense rectified attack surfaces ( 2 B ) by use of a power transmission tool ( 20 ) the tightening in the direction of rotation is possible, wherein the drivers ( 2 ) are configured such that the tool against the tightening direction of rotation of the drivers ( 2 ) slides in such a way that a power transmission through the tool on the screw connection element ( 1 ) contrary to the tightening direction ( 100 ) is prevented. Screw connection element ( 1 ) according to claim 1, characterized in that the attack surfaces ( 2 B ) of circumferentially arranged driver ( 1 ) are all rectified in a perimeter sense. Screw connection element ( 1 ) according to claims 1 and 2, characterized in that in opposite directions in the circumferential direction the drivers ( 2 ) are bevelled so that they are flat in these areas ( 20 ) do not form an attack surface. Screw connection element ( 1 ) according to one of the preceding claims, characterized in that the flat slopes ( 2a ) of the drivers are straight or curved. Screw connection element ( 1 ) according to one of the preceding claims, characterized characterized in that the head ( 10 ) of the screw connection element ( 1 ) is designed cone-shaped. Tool ( 20 ) for the irreversible screwing of the screw connection element ( 1 ) according to one of the preceding claims, characterized in that the tool ( 20 ) inside according to the drivers ( 2 ) on the screw connection element ( 1 ) has corresponding recesses or depressions, which transmit a force to the screw connection element ( 1 ) only in the direction of tightening ( 100 ) allow. Tool ( 20 ) according to claim 6, characterized in that the tool ( 20 ) is an adapter.

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