RU215286U1 - Locksmith's tool for riveting joints with a flat locking head - Google Patents

Abstract

The utility model relates to a hand tool and can be used in the design and manufacture of metalwork tools for making riveted joints. The tool is elongated relative to its vertical axis and contains a working, central and impact parts. A recess in the form of a truncated cone is made in the end surface of the working part. The diameter of the recess D ₁ and the diameter d of the rod of the riveted part of the part are in the following relationship: D ₁ /d=1.8. The result is the exclusion of tool displacement when making a closing head of a flat shape of low height in conditions of limited access. 4 ill.

Description

The utility model relates to a hand tool and can be used in the design and manufacture of metalwork tools for making riveted joints, mainly for making a flat-shaped closing head in the form of a truncated cone when riveting rivets, contacts, racks, etc. of various sizes in places with limited access, for example, in general engineering products.

Known from the prior art is a beard (Locksmith's beards. Specifications. GOST 7214-72, type 1 version 1, p. 2), made on the basis of a symmetrical body of rotation, elongated relative to the axis of the product, containing a working, central and impact parts. The impact part is made in the form of a truncated cone with a hemispherical end surface, and the working part is made in the form of a truncated cone with a flat end.

The prior art crimp for flaring riveting (Author's certificate No. 662231, IPC B21J 15/36 1979) containing a shank and a working part with a forming hole on the end surface, on the working part of which cutting teeth are made around the hole.

The closest in technical essence and achieved results to the proposed technical solution is a bench tool for rivet joints (Utility model patent RU No. 204125, IPC B21J 15/36 2021), made in the form of a body of revolution, elongated relative to its vertical axis, containing working, central and shock parts. The working part and the shock part are separated from the central part by smooth transitions. On the end surface of the working part, protrusions are made in the form of truncated quadrangular pyramids with the formation of an area bounded by a circle, while the protrusions are separated by tracks of equal width S to the proportional side S ₁ of the square of the protrusion top, and the step L of the protrusions, their height H and the width S of the tracks are in the following dependencies: L=4S=1.5H, where: L - protrusion pitch; S - track width; H is the height of the protrusions, while the angle α is equal to 60° at the top of the truncated quadrangular pyramid of the protrusion.

The technical problem lies in the fact that structurally the prototype does not allow to make a low-height flat-shaped closing head in the form of a truncated cone when riveting rivets with a flat end surface (contacts and racks of various sizes) in places with limited access, while its displacement may occur.

EFFECT: technical result is aimed at eliminating tool displacement by making a closing head of small height and flat shape in the form of a truncated cone in places with limited access when riveting rivets with a flat end surface (contacts, racks of various sizes).

The technical result is achieved by the fact that the locksmith's tool for riveting joints with a flat-shaped locking head is elongated relative to its vertical axis, contains a working, central and impact parts. In the end surface of the working part, a recess is made in the form of a truncated cone with a side surface made with an inclination at an angle a, the value of which is less than or equal to 15°, while the diameter of the recess D ₁ , the height H and the diameter d of the rod of the riveted part of the part are in the following dependence :

D ₁ /d=1.6…1.9

H/d=0.5…1.7

where: D ₁ - diameter of the recess of the truncated cone;

d is the diameter of the rod of the riveted part of the part;

H is the height of the recess of the truncated cone.

The essence of the utility model is illustrated by drawings, where:

Fig. 1 - general view of a metalwork tool for riveting joints with a flat-shaped locking head;

Fig. 2 - view A of Fig. one;

Fig. 3 - section B-B of Fig. 2;

Fig. 4 is a general view of the riveted connection of the rack with the body with a flat-shaped locking head.

The metalwork tool for rivet joints with a closing head of a flat shape is made in the form of a body of revolution, elongated relative to its vertical axis, and contains a working 1 (Fig. 1), a central 2 (Fig. 1) and a shock 3 (Fig. 1) parts.

Working 1 and shock 3 parts are made in the form of a truncated cone, the central part 2 is elongated - cylindrical.

Working 1 and shock 3 parts are separated from the central part 2 by smooth transitions 4 (Fig. 1).

End 5 (Fig. 1) surface of the impact 3 parts is made convex. The end 6 (Fig. 1) surface of the working 1 part is made flat limited in diameter D (Fig. 3) with a recess 7 (Fig. 2) in the form of a truncated cone with a diameter D ₁ (Fig. 3) height H (Fig. 3) with the formation narrow annular belt 8 (Fig. 2) limited by the diameter D on the end 6 surface of the working part 1 and the diameter D ₁ of the truncated cone.

The diameter D of the end 6 surface of the working part 1 and the diameter D ₁ of the recess 7 of the truncated cone are selected from the condition:

D/D ₁ =1.4…2.4

where D is the diameter of the end surface of the working part;

D ₁ - diameter of the recess of the truncated cone.

The diameter d (Fig. 4) of the rod of the riveted part of the part in the form of rivets, contacts, racks, etc., the diameter D ₁ of the truncated cone recess and its height H are in the following relationship:

D ₁ /d=1.6…1.9

H/d=0.5…1.7

where: D ₁ - diameter of the recess of the truncated cone;

d is the diameter of the rod of the riveted part of the part;

H is the height of the recess of the truncated cone.

This ratio of the dimensions of the recess in the end surface of the working part in the form of a truncated cone provides plastic deformation of the end surface of the riveted part with the exception of the displacement of the end 6 surface of the working 1 part of the tool on the end surface of rivets GOST10299 - 80, GOST10300 - 80, contacts, racks, etc. . in places with limited access when they are riveted, which is important when carrying out these operations in places with limited access with the execution of a closing head of a flat shape in the form of a truncated cone.

The transition of the side surface of the recess 7 to the bottom 9 (Fig. 2, 3) is made with a radius R=0.5...2.6 (Fig. 3).

Angle α≤15° of the side surface of the recess 7 (Fig. 3). To improve ergonomics on the side surface of the central part 2, a mesh corrugation 10 (Fig. 1) with a gap 11 (Fig. 1) is made with a marking 12 (Fig. 1) in it, indicating the diameter d of the rod of the riveted part.

Bench tool for making rivet joints with a flat closing head is usually made of steel U7A or U8A according to GOST 1435 - 74 or other steel grades with mechanical properties in a heat-treated state not lower than that of U7A grade steel, as a technological tool for making a closing head low height flat shape in the form of a truncated cone in places with limited access when riveting rivets with a flat end surface, contacts, racks, etc. various standard sizes in products of the general mechanical engineering.

An example of the use of this tool is the option of fastening the rack 13 (Fig. 4) to the body 14 (Fig. 4) by riveting its rod with a diameter d to form a closing head 15 (Fig. 4) of a flat shape in the form of a truncated cone, for example, in radio electronic units equipment (REA).

Claims (4)

Bench tool for rivet joints with a closing head of a flat shape, made in the form of a body of rotation, elongated relative to its vertical axis, containing a working, central and impact parts, the working and impact parts are separated from the central part by smooth transitions, characterized in that in the end surface of the working part, a recess is made in the form of a truncated cone, while the diameter D ₁ of the recess and the diameter d of the rod of the riveted part of the part are in the following dependence: D ₁ / d \u003d 1.8, where: D ₁ - diameter of the recess of the truncated cone; d is the diameter of the rod of the riveted part of the part.

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