SU1567336A1 - Safety chuck for screw taps - Google Patents

Abstract

The invention relates to metalworking, namely to tapping threads in a chuck. The aim of the invention is to simplify the design of the cartridge by reducing the number of parts, as well as expanding technological capabilities by adjusting the magnitude of the torque. The safety cartridge consists of a shank 1, the lower part of which is made in the form of petals 2 with a thread, on which the lid 3 is screwed. In the lid 3 there is a hole in which the holder 4 is placed, supporting it with a flange 5 on its holder, in which the spring 6 is located, as well as the rollers 8 and the tap 7. The holder 4 with the rollers 8 moves in the sleeve 9 fixed by the screw 10 in the shank 1. The washer 11 moves on the sleeve 9 fixed by lock nuts 12. When the tap 7 rotates in the hole being machined toolholder 4 move in the direction of the shank, compressing the spring 6, while the flange 5 of the holder 4 is displaced inside the cartridge with the rollers 8 relative to the petals of the sleeve 9. If the torque exceeds the calculated one, the holder 4 with the rollers 8 will press the petals of the sleeve 9 and begin to rotate around its Axis, protects the tap from breakage. To change the torque, the washer 11 is moved along the sleeve 9 and fixed with nuts 12. 3 Il.

Description

The invention relates to metalworking, namely to tapping threads in a chuck.

The purpose of the invention is to simplify the design by reducing the number of components, as well as expanding technological capabilities by adjusting the magnitude of the torque.

Figure 1 presents the safety Pygron, General view; in Fig.2 a section aa in Fig.1; on fig.Z - section BB on flash. one .

The safety cartridge for threading taps contains a shank 1, the lower part of which is made in the form of petals 2 with a thread, the cover 3 is screwed on them, the latter has a central hole in which the holder 4 is supported with a gap, supported on its edges by a flange 5zh, the holder has an axial drilling channel where the spring of axial compensation 6 and the tap 7 fixed by the pin are placed, and the sockets with rollers 8 placed in them. The holder with the rollers 8 has the ability to axially move inside the sleeve 9 fixed intom

10 in the body of the shank 1, which contacts with its petals with the rollers 8. A washer 11 can freely move along the body of the sleeve 9, the protrusions of which enter the grooves of the slots of the lower part 2 of the shank 1. Washer

11 fix in the desired position two lock nuts 12.

The safety cartridge d w taps work. It is as follows.

The cartridge is placed in the spindle of the thread-cutting machine (not shown) with an axial feed pitch, a somewhat larger pitch of the thread cut by the taps 7, the initial position is shown in FIG. In contact with the rotating axis of the tap 7 with the edge of the hole being cut, the spindle at each turn lags behind in its axial movement by the magnitude of the difference of steps. Due to this lag, the holder 4 together with the fixing nut 7 is mixed in the direction of the shank 1, while the compensating spring 6 is compressed, the flange of the holder 5 is displaced inside the cartridge simultaneously with the rollers 8 relative to their tightly retaining petals 9. Reli during cutting thread the cutting mode with overload (5% higher than the calculated torque value), then the holder 4 with the rollers 8 installed in it will start to press the ends of the petals of the sleeve 9 and the circle of its longitudinal axis will rotate guards the slmym tap 7 from breakage.

To change the magnitude of the torque, adjusting or adjusting it, just pull the washer

11, by rotating one of the nuts 12, move the washer 11 along the bodies of sleeve 9 either in the direction of the shank 1 (reducing the stiffness of the petals) or in the direction of the tap 7 (increasing the rigidity of the petals), after which the washer 11 must be fixed with one of the nuts 12.

The use of rollers in the torque safety mechanism greatly simplifies the entire design of the chuck for taps. The cartridge includes slightly more than a dozen parts, which makes the design idle, reducing manufacturing costs. Constructive simplification increases the reliability of the device in operation.

Claims (1)

Invention Formula Safety cartridge for taps, consisting of a shank and axially spring-loaded der-kaiki, in which the mechanism limiting the magnitude of the torque, containing rolling elements, o t - because, in order to simplify the design and expand Reni technological capabilities the torque limiting mechanism is made in the form of a split-in driver, in the grooves of which heat rollers are placed in the form of rollers, and through the tailpiece there are through grooves, while the cartridge is equipped with hatchets with protrusions on the outer surface intended to be inserted into the grooves of the shank, and nut intended 45 for fixing the washer on the shank. FIG. one in and at Fig.Z Compiled by F.Hamidullin Editor M.Tovtin Tehred L.Oliynyk Order 1288 Circulation 616 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Proofreader L. Patay Subscription