Method for producing a nut which is rotationally connected to a cable shoe, and nut which is rotationally connected to a cable shoe

Abstract

The invention relates to a method for producing a nut which is rotationally connected to a flat part connecting section of a cable shoe, wherein the flat part connecting section has a passage opening, the nut has a sitting face which is at the bottom in the connected state, and a holder section extends on the nut from the sitting face further downward, wherein a tapered portion of the passage opening is formed by a holder material section which is preliminarily curved into the passage opening by deformation, and the holder material section is produced by a recess which is made in the flat part connecting section so as to surround the passage opening on a top side of the flat part connection section, which top side is associated with the sitting face. In order to specify a method of this kind which can be carried out in respect of production, in particular in respect of the production costs, in a favourable manner, it is proposed that the holder material section is first formed and the nut is placed onto the top side, wherein the holder section protrudes downward beyond a narrowest cross section of the passage opening which is formed by the holder material section, and that the holder section is then widened below the narrowest cross section, for the purpose of holding the nut on the cable shoe in a rotatable and interlocking manner. The invention further relates to a nut which is fitted in a rotatable manner on a flat part connecting section of a cable shoe.

Claims

1. A method for connecting a nut to a flat part connecting section of a cable shoe comprising: providing the nut having a seating face at a bottom thereof, and a holder section extending downward from the seating face; providing the flat part connecting section; forming a passage opening in the flat part connecting section; forming a recess around the passage opening in a top side of the flat part connecting section, thereby deforming a holder material section of the flat part connecting section to form a tapered portion of the passage opening which curves into the passage opening, the holder material section forming a narrowest cross section of the passage opening; inserting the nut into the passage opening through the top side of the flat part connecting section with the holder section of the nut protruding downward beyond the holder material section; and widening the holder section of the nut underneath the holder material section, thereby holding the nut on the flat part connecting section in a freely rotatable and interlocking manner.

2. The method according to claim 1, further comprising surface treating the flat part connecting section before attaching the nut to the flat part connecting section.

3. The method according to claim 1, wherein the forming of the passage opening in the flat part connecting section and the forming of the recess are done at the same time.

4. The method according to claim 1, wherein the forming of the passage opening in the flat part connecting section is done prior to the forming of the recess.

5. The method according to claim 1, wherein the holder section of the nut is widened by plastic deformation.

6. A combination comprising: a nut comprising a seating face at a bottom thereof, the seating face extending linearly from an opening through the nut, and a holder section extending downward from the seating face; and a flat part connecting section of a cable shoe, the flat part connecting section comprising a bottom side and a linearly extending top side, a passage opening extending between the top side and the bottom side, a recess extending downward from the top side, the recess surrounding the passage opening and being spaced outwardly from the passage opening, and a holder material section forming a tapered portion of the passage opening which is curves into the passage opening and forms a narrowest cross section of the passage opening, wherein the seating face of the nut is seated on the top side of the flat part connecting section and covers the recess but does not enter into the recess, and the holder section protrudes downward beyond the holder material section and extends underneath the holder section, such that the nut is held on the flat part connecting section in a freely rotatable and interlocking manner.

7. The nut according to claim 6, wherein the recess a circumferential groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is described in greater detail below with reference to the attached drawings that, however, merely show exemplary embodiments. In these drawings:

(2) FIG. 1 shows a first embodiment of a nut that is connected to a cable shoe;

(3) FIG. 2 shows the enlarged detail II-II of FIG. 1;

(4) FIG. 3 shows another embodiment, in which the cable shoe is made of solid material, in the form of an illustration according to FIG. 1;

(5) FIG. 4 shows another embodiment according to FIG. 1 or FIG. 3 with a nut, which has a recessing formation on the seating face;

(6) FIG. 5 shows the enlarged detail V-V of FIG. 4; and

(7) FIG. 6 shows an exemplary illustration of the production of the cable shoe according to FIG. 1, which is connected to a nut.

DESCRIPTION OF THE EMBODIMENTS

(8) A cable shoe 1 with a flat part connecting section 2 is initially described with reference to FIGS. 1 and 2. A nut 4 is seated on the top side 3 of the flat part connecting section 2. The nut 4 conventionally contains a screw opening 24 with an internal thread 5. The nut 4 is seated on the top side 3 by means of the seating face 6. A holder section 7 extends further downward from the seating face 6 and may be realized cylindrically in the initial state as illustrated, e.g., in FIG. 6f. The holder section 6 preferably is realized integrally with the nut 4 and made of the same material.

(9) The flat part connecting section 2 furthermore contains a passage opening 8 that has a geometric center axis 9.

(10) FIG. 2 particularly shows that a holder material section 10 protruding into the passage opening 8 is formed on the flat part connecting section 2 and encompassed by the holder section 7, which is widened by plastic deformation on its free end.

(11) A recess 11 is furthermore produced in the flat part connecting section 2 starting from the top side 3. This recess 11 has led to the formation of the holder material section 10.

(12) According to the embodiment in FIGS. 1 and 2, as well as all other embodiments described herein, the nut is therefore held on the cable shoe 1 in a form-fitting but freely rotatable manner. A certain axial play, which advantageously allows the free rotatability, preferably remains between the holder material section 10 and the holder section 7, which cross-sectionally encompasses this holder material section.

(13) The embodiment in FIG. 3 corresponds to the embodiment in FIGS. 1 and 2. Identical components and regions accordingly are identified by the same reference symbols.

(14) The only difference can be seen in that the flat part connecting section 2 is made of solid material. Accordingly, there are no folded sections that form two layers 12, 13 in a cross section.

(15) In the embodiment in FIGS. 4 and 5, the nut 4 is directly realized with a recessing projection 14 on the seating face 6 thereof.

(16) This recessing projection 14 particularly may consist of a vertical face 15, which preferably includes an acute angle with the vertical line. A peripheral face 16 may furthermore be formed so as to likewise include an acute angle with a vertical line V. The design can also be described in such a way that both faces include an acute angle with a horizontal line, which is not illustrated in greater detail.

(17) The acute angles and preferably lie in the range of 1-60. It is furthermore preferred that the angle lies between 10 and 30 and the angle lies between 20 and 50. In the exemplary embodiment, the angle amounts to 15 and the angle amounts to 30.

(18) On its radially outer side, the vertical face 15 transforms into a horizontal face 17 that, if applicable, may have a different radial extent over the circumference in a hexagonal design of the nut.

(19) In this embodiment, the described faces 15-17 jointly form the seating face of the nut 4. In a concentric alignment between the nut 4 and the passage opening 8, the seating face extends radially inward until it overlaps with the edge of the passage opening 8, particularly referred to the edge that remains unaffected by a deformation process.

(20) As a result of the described angular design of the peripheral face 16 and the vertical face 15, a resilience of the material of the flat part connecting section 2 can occur when the nut 4 is correspondingly pressed into the top side of the flat part connecting section 2, wherein said resilience in any case causes the horizontal face 17 to be slightly raised above the top side 3 of the flat part connecting section 2. The desired easy rotatability can also be advantageously affected in this way.

(21) In contrast to the embodiment in FIGS. 1-3, the holder material section 10 in the embodiment in FIGS. 4 and 5 is normally shifted further downward into the passage opening 8 in the flat part connecting section 2.

(22) An example of the production of a nut, which is rotationally connected to a flat part connecting section of a cable shoe, is described in greater detail below with reference to FIG. 6.

(23) A tube section 18 may be used as base product for the cable shoe 1. The tube section 18 is pressed into a flat shape on one side in order to form the flat part connecting section 2; see FIG. 6b.

(24) The passage opening 8 can be produced in the next step; see FIG. 6c. This may be realized, for example, by means of a punching process. In an alternative embodiment illustrated in FIG. 6c, the recess 11 can be produced simultaneously with the production of the passage opening 8, which is preferably realized by means of a punching process. This figure also shows an example of a combined recessing and punching tool 25, which can be used for this purpose. In this case, the production of the passage opening 8 and the production of the recess 11 are carried out in an integrated manner.

(25) If the production of the passage opening 8 and the production of the recess 11 are not carried out in an integrated manner, the recess 11, which in the exemplary embodiment illustrated in FIG. 6 consists of a circumferential groove, is produced in another optional production step; see FIG. 6d. This figure furthermore shows a die tool 23, which can be optionally used for producing the recess 11.

(26) In another production step that is indicated in FIG. 6e, the thusly prepared cable shoe can be subjected to a surface treatment, e.g. for applying a surface coating, particularly an anti-corrosion coating 19.

(27) The nut 4 is attached to the top side 3 of the thusly produced cable shoe in the next production step; see FIG. 6f. In this case, the holder section 7 is still undeformed and protrudes downward into the passage opening 8 beyond a narrowest cross section x of the holder material section 10.

(28) The holder section 7 is widened by means of a mandrel 20 in the next production step; see FIG. 6g. In order to limit the advance of the mandrel 20, a flatly designed top side 21 thereof can come in contact with the associated bottom side 22 of the flat part connecting section 2.

LIST OF REFERENCE SYMBOLS

(29) 1 Cable shoe 2 Flat part connecting section 3 Top side 4 Nut 5 Internal thread 6 Seating face 7 Holder section 8 Passage opening 9 Center axis 10 Holder material section 11 Recess 12 Layer 13 Layer 14 Recessing projection 15 Vertical face 16 Peripheral face 17 Horizontal face 18 Tube section 19 Anti-corrosion coating 20 Mandrel 21 Top side 22 Bottom side 23 Die tool 24 Screw opening 25 Combined recessing and punching tool Angle Angle V Vertical line x Cross section