DE2943400A1 - SELF-LOCKING NUT - Google Patents

Description

Self-locking mother

The present invention relates to a self-locking nut consisting of a body on which external key attachment surfaces are provided and which is completely penetrated by an opening from the top to the bottom with a The end provided with the support surface is sufficient and the one with a Internal thread is provided.

The invention is based on the object of creating a self-locking nut of the type mentioned in more detail at the outset, which has a has a particularly tight fit and thus a high resistance to unintentional loosening.

This problem is solved with the features specified in the characterizing part of claim 1. Advantageous configurations are described in the subclaims.

In the following the invention is explained in more detail with reference to the drawing, in which an advantageous embodiment is shown. Show it:

030021/066 (3rd

Figure 1 is a partially broken away side view of a Embodiment.

FIG. 2 shows a plan view of the nut drawn in FIG. FIG. 3 is a bottom view of the nut shown in FIG.

FIG. 4 is an enlarged view, partly in cross section a nut according to the invention, together with a screw bolt and a workpiece.

The nut denoted by 1 has a body 3 made of a suitable material / for example steel and is provided with an outer circumference and an inner opening 7 which is arranged coaxially to the circumference. The body 3 has an upper end 9 and a lower end 11, the latter being provided with an annular bearing surface 13. The body 3 is completely penetrated by the opening _t which therefore extends from the upper end to the lower end. The body 3 is with one? Provided internal thread 15, which has flanks and a ramp, whereby the opening is limited. Furthermore, the body 3 has suitable outer key attachment surfaces arranged symmetrically to the axis, such as, for example, the Z & oil- edged configuration, which is visible as the outer urofan 5 Is. It should be emphasized that the invention can also be applied to other nuts.

The helical thread 15 preferably has the profile 13 shown, although other dimensions and angles can also be selected. Such a thread is z. Known from US-PS 4,076,064. Each thread turn has a front _{flank 17 and a rear flank 13 f} as well as a surface in the form of a ramp 21 arranged at the thread root of the nut. In the illustrated embodiment in which the thread turns 15

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OBiGlNAL WSPECTED

2 9 A 3 4 O O

with conventional external threads 23 on a screw bolt 25 cooperate, the flanks 17 and 19 form angles of approximately 30 ° to a plane which is perpendicular to the axis of the opening 7, while the ramp 21 is substantially is arranged perpendicular to the front flank 17.

According to the invention, the opening 7 now has a lower section 7a, which has a constant, circular cross-section or diameter, and an upper portion 7b, which extends tapers towards the inside. Since both sections have threads are provided, the thread diameter in section 7b and in particular the diameter of the ramp 21 slowly decreases along one or more radii of the opening. As shown in particular in FIG. 4, the nut can easily be attached to a screw bolt are screwed / until the thread 23 of the tapered Section 7b reached, and thus the ramp 21, egg diameter is now lower. From this point on, the screwing in of the thread 23 on the screw bolt is subject to a certain resistance Bred to mother in order to secure the security.

Another torque is applied to the nut 1 and the bolt 25 exerted existing arrangement, the nut body expands elastically in the vicinity of the section 7b, after which, when the support surface 13 rests on the workpiece 27, the tension in the screw bolt and its expansion ensures that the threads 23 of the bolt slide under the ramps 21. Figure 4 shows the state in which the beginning of a significant Pressure occurs between the nut and the workpiece, after which, with increasing force exerted on the bolt, the thread 23 thereof Ramps 21 in the lower section 7a touched.

The further increase in torque causes the bolt thread more and more along the ramps up to the

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_ ₆ _ 29A3400

Rear flank 19 and thus aligns the parts, eliminates play, and so provides significant resistance to causes unwanted loosening.

The tapering section 7b of the opening together with the wedge-shaped ramps 21 ensure that the arrangement has a high resistance to unintentional loosening, in particular in the event of vibrations of any kind. The thread 15 is preferably formed in a single production process with a constant diameter _f ie in an opening 7 of constant, uniform, circular cross-section. The body 3 is then advantageously deformed in its upper part by radial inward pressure. This can be done along a line that forms an oval, but is advantageously done at three points that form an equilateral triangle. If the nut is made of steel or the like, the nut is permanently deformed into a shape when a sufficiently high compressive force is applied , which is shown essentially in Figure 2 »it should be noted that Figures 1 and 4 show partial cross-sections through a plane through the point 29. The opening portion lh can accordingly be viewed as a tapering, essentially triangular cross-section _f while the lower portion 7a remains essentially circular, as shown in Figure 3, the tapered portion is deformed 7b according to a & m forming the thread in the opening, the Raropen 21 are bent portion 7b inward, the vertical ^ ie in the direction at an angle Santander corresponds to the taper angle. This means that the angle of the saiape changes to the vertical, ie towards the axis and thus increases the friction between the intermeshing threads.

Instead of the deformation process just described, <l upper part 1 7b of the opening can also be de-

Ö30021 / 06 «3

; .- ..: 29Λ3Α00

be formed and thus rejuvenated. There are tapers in nuts with common V-shaped or standard threads known in the screw industry, as well as nuts, their Clamping effect by upsetting inwards at two or three points on the circumference based, and which are provided with standard threads. It can therefore use the known methods of generating the change in cross-section of the thread opening is used will.

030021/0683

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Claims (1)

29A3400 Uwe M. Haft Patent attorney Registered Representative before the European Patent Office Maximilianstrasse 15 D-8000 Munich 22 Tel .; (089) 294818 Telex: 523514
Telegr .: NOVAPAT H 471 MICRODOT INC., 475 Steamboat Road, Greenwich, Connecticut 06830, Unites States of America Claims 1.j Self-locking nut, consisting of a body on which outside key attachment surfaces are provided and which is completely penetrated by an opening from the upper end to the lower end with a support surface and which is provided with an internal thread, characterized in that the adjacent to the upper end Part of the nut body is deformed radially inward and tapers towards the axis of the opening so as to its To reduce the diameter in the upper part, as well as the thread 030021/0663 ORIGINAL INSPECTED Durchrnesser in this part, while the diameter of the opening and thus of the thread between the upper parts and the lower end substantially constant and larger than that of the thread and hence the opening in the upper Part is. 2, nut according to claim 1, characterized in that the upper part of the opening has a substantially triangular cross-section and the wedge-shaped ramps in the vicinity of the thread root in this upper part extend more axially than those of the remaining thread. 3. Self-locking mother, consisting of a body * on the outside Sbhlüsselansatzflachen are provided and which is completely penetrated by an opening from the upper End to the lower, provided with a support surface End is enough, characterized in that the opening is extends along a uniform portion that from the support surface to an axial intermediate layer in the body extends, as well as a tapered section extending from the uniform portion toward the top of the body, the uniform portion has substantially uniform cross-sections in LMngsausdehmmg and the tapered portion Cross-sections in at least one direction with the Decrease the distance from the support surface and that the body threaded inside along the entire opening is, which has edges and ramps. 4 »nut according to claim 1, characterized in that the upper portion of the body deformed radially inward is the tapered portion of the opening ζια to shape. 5, nut according to claim 4, characterized in that the tapering portion of the opening has a substantially triangular cross-section. 030021 / G6S3