SU708075A1 - Device for connecting parts accessible from one side - Google Patents

Description

(54) DEVICE FOR CONNECTING PARTS WITH UNILATERAL ACCESS

The invention relates to mechanical engineering and can be used in nodes connecting parts with one-way access.

A device is known for connecting one-way access parts, one of which is made with a hole, and the other with a threaded rod concentrically arranged in a hole with a gap, onto which a threaded nut 1 is screwed from the side of one of the parts.

However, the manufacture of the known device is laborious; pre-marking and production of holes and associated rods are required.

It is also known a device for connecting one-way access parts, comprising a sleeve installed in the combined-through holes of the parts to be connected, and an expandable rod with a conical collar / co-operating with an abutment element located in it with the possibility of axial movement, the sleeve and the rod having rezbov1. 1c shanks, and means for

the axial fixation is made in the form of a pair of nuts, screwed respectively on the threaded shanks of the rod, and the rod is fixed in the sleeve from the angular twist 2.

The known device by its technical importance and the effect achieved is closest to the invention.

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But in such a device, it is possible for the expanding rod and the stop elements (balls) to fall out of the inaccessible area during the connection or separation of parts and to contact the contacting surfaces of the stop element.

The purpose of the invention is to reduce contact pressure and increase reliability.

The goal is achieved by the fact that the expanding rod in the transition zone of the conical collar to the cylinder is made with an additional annular collet with a diameter equal to the diameter of the larger base of the conical flange, the sleeve is made with radial grooves, and the thrust element is in the form of freely entering into these grooves-cams interacting with a conical collar

rod and covered outside by an elastic ring.

The pa in the drawing shows the proposed device; the left side of the projection shows the initial moment of mounting the joint, the right in the closed state.

The device consists of a sleeve 1 and a razimny stern 2. located in it with the possibility of axial movement. The sleeve and the core have threaded shanks with pressure nuts 3 and 4 screwed on them. The clamp is fixed in the sleeve from the angular rotation of the key 5. The sleeve is made with radial grooves , in which the cams 6 are movably spread, covered by an elastic ring 7 installed in the combined annular groove of the cams and sleeves. The cams of the inner inclined surface rests on the conical surface of the rod 2. The latter is provided with an annular protrusion 8 located above the upper expanding conical part, the diameter of which is equal to the outer diameter of the lower expandable conical part.

The device works as follows.

It is necessary to push the device into the nut 3 (cMf, the left part of the projection) into the aligned holes of the parts to be connected (in the drawing are shown in thin lines). For this, it is necessary that the size, which is adjusted by screwing the nut 3, from the lower end surface of the pressure nut 3 to the upper end surface of the cams, would be no less than the thickness of the parts to be joined and the cams b would be recessed in the sleeve 1. Then the rotation 4 of the nut 4 axial movement) of the clamp rod 2 up to the stop with the upper end of the annular protrusion 8 into the bore of the sleeve. The expanding rod 2, moving up, pushes its fist 6 with its tapered portion in the radial direction. For the final connection of parts Nut 3 is tightened (see the right side of the projection).

To remove the device, nuts 3 and 4 are loosened, the rod 2 is lowered up to the stop by the lower end of the annular protrusion 8 in the upper torus of the cams b, which are returned to their original position by the action of the elastic ring 7, and the device is removed from the orifice of the parts to be joined.

The elastic ring 7 prevents the cams from falling out of the radial grooves of the sleeve 1. Thus, the proposed device for connecting parts with one-sided access improves the reliability of fastening the parts and eliminates contact of the contacting surfaces of the stop element.

Claims (2)

Invention Formula Device for connecting parts with one-sided access, containing a sleeve with a threaded shank, located in it with the possibility of axial movement of an expanding rod with a threaded shank and a tapered collar cooperating with the abutment element, a pair of fixing nuts, screwed respectively onto the threaded shanks of the sleeve and a rod, characterized in that, in order to decrease the contact pressure and increase the reliability of operation, the expansion rod in the transition zone of the conical collar in the cylinder is made with an additional annular collar with a diameter equal to the diameter of the larger base of the conical collar, the sleeve is made with radial grooves, and the thrust element in the form of cams that interact freely with the conical collar of the rod and covered; outside elastic ring. T1 SOURCES of information taken into account during the examination 1, USSR Author's Certificate W 331190, cl. R 16 B 5/02, 1972. 2. USSR author's certificate number 562675, cl. F 16 W 2/16, 1977 (prototype).