SU25032A1 - Device to protect the tap from breakage when cutting blind holes - Google Patents

Description

Patent No. 17980 describes a device for protecting a tap from breakage when cutting deaf holes, equipped with a travel stop made in the form of a rod with a crossbar, placed in a central hole with taps and at the end of cutting a tap from the coupling with the machine spindle by pressing the cross bar on the spindle nose .

In the proposed device, clamp-on clamps, which are fastened in a clutch, are inserted in order to impart rotation to the tap in the slots of the retaining head; the clips are led out of the indicated nests by the action of a spring by deflecting the latches by a rod passing through the matrix with its stop against the bottom of the cut hole.

In FIG. 1 is a front view of the proposed fixture, with a partial cut thereof; FIG. 2 is a side view.

The proposed device consists of a head, provided in the lower part with a socket 10 for inserting the tap and in the upper part an annular recess 16 in which the washer 2 is placed, and a diametral hole where the plate 3 is inserted; A rod 12 is screwed into the bottom surface of that plate, passing through the hole in the head 1 and the timer inserted into it, and protruding beyond the end of the tap. At its upper end, the head is fastened with the help of a wire 5 in the sleeve 4 so that it can freely rotate. The clutch 4 is equipped with a cone b for installation in a drilling machine and two hinged fortified tongs 7, the ends of which can enter the slots 8, made in the head 1; The latches 9 are hinged to the clips, the ends of which extend beyond the edge of the annular notch 16 of the head 1. A spring 11 is screwed to the ends of the clips, which represents a ring made of flat steel. The upper inclined parts of the clips 7 are enclosed by a ring 13, which can be lifted (the right part of the ring in Fig. 1) and lowered (the left part of the ring in Fig. 1) by means of a fork 15, which is worn on the pin 14 of the ring 13; the fork is hingedly mounted on a rack located away from the described device, and its opposite end must be so long and heavy that it weighs the ring 13 upwards with its weight.

When the tap is in operation, the ends of the clamps enter the sockets 8 of the head 1, which

rotates together with the coupling 4, and the clamps are held in this position by latches 9. When the end of the rod rests on the bottom of the hole being cut, it stops, as a result, plate 3 separates from the head that continues to rotate the ends of the latches 9 of the undercut 16; then the clamps 7 are retracted to the sides under the action of springs 11, which take the position shown in the figure by a dotted line, and the ends of the clamps exit from the sockets 8, as a result of which the head 1 with the tap disengages from the coupling 4 and stops its rotation. In order to re-couple the head 1 with the clutch 4 during the return stroke of the machine, the end of the fork 15 is raised, and the ring 13 is lowered and presses the clips 7;

the ends of the clips enter the sockets 8 of the head 1, and the ends of the latches 9, after some turning of the head, grip the edges of the recess 16 and hold the clips in the working position.

The subject matter of the invention.

In the device for protecting the tap from breakage when cutting deaf holes according to patent No. 17980, the cartridge for the tap is characterized by using tick-borne clamps 7 pivotally secured in the coupling 4 to be inserted into the socket of the retaining head 1 by pressing on them 13 and outputted from the indicated nests by the action of the spring P, by deflecting the latches 9 by the rod 12 while resting it in the bottom of the cut hole.