Double nut

Abstract

A double nut is provided in which a flange nut and an insert nut are coupled. The flange nut has a longitudinal axis and has, in an end region facing the insert nut, a stop surface and a wall surface. The insert nut has a longitudinal axis and has at least one snap element in an end region facing the flange nut. The stop surface extends over the at least one snap element radially in the direction of the longitudinal axis of the flange nut. The flange nut has a guide surface in the end region facing the insert nut which is disposed closer to the longitudinal axis of the flange nut than the wall surface.

Claims

1. A double nut, comprising: a flange nut having a flange nut longitudinal axis; and an insert nut having an insert nut longitudinal axis, wherein the flange nut includes in an end region facing the insert nut a stop surface, a wall surface adjoining the stop surface, and a guide surface, the insert nut includes a plurality of snap elements in an end region facing the flange nut, each snap element of the plurality of snap elements is at least in part resiliently deformable radially, the stop surface extends at least partially over the snap elements of the plurality of snap elements radially in the direction of the longitudinal axis of the flange nut, producing an overlap to retain the insert nut in the flange nut, the guide surface is at least partially closer to the longitudinal axis of the flange nut than the wall surface, the guide surface at a guide surface end facing the insert nut is radially closer to the longitudinal axis of the flange nut than a guide surface end facing axially away from the insert nut, and the guide surface and the snap elements of the plurality of snap elements are configured to cooperate such that as the insert nut is introduced into the flange nut, the guide surface guides the snap elements radially away from the longitudinal axis of the flange nut into a space between the wall surface and the guide surface radially overlapped by the stop surface.

2. The double nut according to claim 1, wherein each snap element of the plurality of snap elements is at least in part inclined radially toward the longitudinal axis of the insert nut.

3. The double nut according to claim 1, wherein each snap element of the plurality of snap elements includes a foot surface configured to cooperate with the stop surface of the flange nut to retain the insert nut in the flange nut.

4. The double nut according to claim 1, wherein the guide surface is rotationally symmetrical.

5. The double nut according to claim 1, wherein the flange nut includes an internal thread.

6. The double nut according to claim 5, wherein the insert nut has an internal thread in a main body portion, and the at least one snap element includes a conical internal thread.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a section through a double nut according to an embodiment of the invention, and

(2) FIG. 2 shows a section through the double nut of FIG. 1 during manufacture.

DETAILED DESCRIPTION

(3) The embodiment of the double nut 1 of FIG. 1 includes a flange nut 2, in which the insert nut 3 is partially introduced.

(4) In this case the flange nut 2 has a continuous cutout around a longitudinal axis 21 with an internal thread 22. The stop surface 24, with which the flange nut 2 extends over the insert nut 3 and retains the insert nut 3 by the overlap, is located at the end region 23 of the flange nut 2 which faces the insert nut 3.

(5) A wall surface 25 which extends substantially parallel to the longitudinal axis 21 adjoins the stop surface 24.

(6) The guide surface 26, which has a conical widening away from the insert nut 3, is located radially further inside and thus closer to the longitudinal axis 21. The guide surface 26 is located with an end face 27 along the longitudinal axis 21, as seen from the insert nut 3 below the stop surface 24, and with the foot face 28 further away radially outward from the longitudinal axis 21.

(7) A further portion, which protrudes radially outward here at a height along the longitudinal axis 21, is located between the foot face 28 and the wall surface 25.

(8) Overall a defined region is produced in the inner cutout of the flange nut 2.

(9) The radially inner face of the part of the flange nut 2 which supports the guide surface 26 also forms a portion of the internal thread 22 here.

(10) The insert nut 3 likewise has a longitudinal axis 31 which here coincides with the longitudinal axis 21 of the flange nut 2. Furthermore, a main body 32 is provided which also carries the internal thread 33. In the end region 34 a plurality of snap elements 35 are provided, which likewise have an internal thread 36 here.

(11) The snap elements 35 in each case have a foot face 37, which are directed radially outward here, so that an overlap between snap element 35 and stop surface 24 is produced which in turn ensures that the insert nut 3 cannot fall out of the flange nut 2.

(12) The effect of the guide surface 26 is described with reference to FIG. 2, which shows the double nut 1 during manufacture.

(13) For the introduction of the insert nut 3 into the flange nut 2 the snap elements 35 are resiliently bent radially in the direction of the longitudinal axis 31, i.e. when the force no longer acts the snap elements 35 return to their preceding and original form. The bending also occurs here in particular in the region of the transition from the main body 32 to the snap elements 35. Due to the bending the foot faces 37 project outward less and have in particular a smaller external diameter than the stop surface 24 of the flange nut 2.

(14) The guide surface 26 is provided in order to simplify the fitting of the insert nut 3 into the flange nut 2 and in order to reliably enforce the radial original position. Since the guide surface 26 widens outward with the depth, the snap elements 35 are moved outward by the introduction of the insert nut 3 into the flange nut 2 and therefore below the radially surrounding stop surface 24.

(15) Overall the stop surface 24, the wall surface 25, the connection to the foot face 28 of the guide surface as well as the guide surface 26 itself form an inner space within the inner cutout of the flange nut 2, into which the snap elements 35 are introduced by means of the resilient deformation radially in the direction of the longitudinal axis 21 of the flange nut 2 or the longitudinal axis 31 of the insert nut 3.

(16) The effect of the guide surface 26 with the conical widening is that a force by which the insert nut 3 is introduced into the flange nut 2 has a force component onto the snap element 35 in the radial direction and thus the snap elements 35 are pressed outward.

(17) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.