RU1784755C - Fastening device - Google Patents

Abstract

Usage: in mechanical engineering, in the design of mounting devices. SUMMARY OF THE INVENTION: the device comprises a bolt with a nut and a spacer assembly mounted on the bolt between its head and nut for installation in the hole of the base part, made with two bushings with inclined lateral surfaces, the last of one sleeve facing the same surface of the other, expandable the assembly is provided with a cage with radial holes and movably mounted in the last fingers with scrupulous ends, the inclined side surfaces of the bushings are made conical, and the fingers are mounted with a contact ne of the ends with conical surfaces vtulbkҐs possibility of contact with the wall opening in the base member. 2 ill.

Description

The invention relates to mechanical engineering and relates to the construction of fastening devices.

A fastening device is known comprising a bolt located in an opening of a connected part with a nut and two counter-tapered bushings mounted on it, between which there is an elastic expandable element having a cylindrical sleeve in a free state

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The known device does not provide sufficient reliability, since the elastic expandable element interacts with the wall of the hole in the connected part only in a small area, in addition, the expandable element is complicated in construction and labor-consuming to manufacture,

Closest to the invention in technical essence is a mounting device comprising a bolt with a nut and a spacer assembly mounted on a bolt between its head and nut for installation in the hole of the base part, made with two bushings with inclined lateral surfaces, the last of one sleeve facing similar surface to another 2.

A drawback of this mounting device is the limited range of hole diameters in the base part.

The purpose of the invention is to expand operational capabilities by using for fastening parts with O7 holes of different diameters.

This goal is achieved by the fact that the expanding unit is provided with a cage with radial holes and movably mounted in the last fingers with rounded ends, the inclined side surfaces of the bushings are made conical, and the fingers are installed with contact of one of the ends with conical surfaces

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and with the possibility of contacting the other ends with the wall of the hole in the base part.

Figure 1 shows the mounting device, General view, section; Fig. 2 is the same plan view.

The fastening device comprises a bolt 1 with a nut 2 and an expanding unit mounted on the bolt between its head and nut for installing versts 3 of the base part 4, provided with a cage 5 with radial holes 6 and movably mounted in the last fingers 7 with rounded ends. The inclined surfaces of the bushings 8, 9 are made conical, and the fingers 6 are installed with the contact of one of the ends with the conical surfaces of the bushings 8, 9 and with the possibility of contacting the other ends with the wall of the hole 3 in the base part 5.

The entire assembly is inserted into the hole 3 of the base part 5. When the nut 2 is screwed, the bushes 8, 9 move towards each other along the bolt 1. As a result of the interaction of the conical surfaces of the bushes 8, 9 with the fingers 7, the latter move into the radial holes x 6 and after stopping their ends against the wall of the hole 3, the entire device is jammed in this hole of the part 4.

When removing the device, unscrew the nut 7 and the mounting device assembly

is removed from the hole 3 of the part 4. The installation of the movable fingers 7 in the radial holes 6 in the cage 5 expands the range of dimensions for the diameter of the hole in the base part and thereby improves the operational capabilities of the mounting device.

Claims (1)

The claims A fastening device comprising a bolt with a nut and a spacer assembly mounted on a bolt between its head and nut to be installed in the hole of the base part, made with two bushings with inclined side surfaces, the last of one sleeve facing the same surface of the second, characterized in that, in order to expand operational capabilities by using for fastening parts with holes of different diameters, the expansion unit is provided with a cage with radial holes and movably mounted in the latter them with fingers with rounded ends, the inclined side surfaces of the bushings are made conical, and the fingers are installed with contact of one of the ends with the conical surfaces of the bushings and with the possibility of contacting the other ends with the wall of the hole in the base part. 0U8.2