RU27475U1 - ANGULAR TIP HEAD WITH BUTTON LOCK - Google Patents

Description

The present invention relates to medical equipment, namely, to dental handpieces and can be used to fix cutting tools and transmit them torque from the drill drive.

The well-known "Swivel head for) rear tip, and.with. USSR No. 1146030 IPC А61С 1/12, published March 23, 85, Bull. No. 11. The head contains a hollow rod with two symmetrically arranged beams with an angle between them of 3090 and a locking element made in the form of a split washer with protrusions corresponding to the cutouts of the hollow rod. Clamping and releasing the cutting tool in this design is done by pressing a button on the locking element, the protrusions of which are moved apart by the axial force,

as a result, the cutting tool comes in or out of the hollow shaft.

This design is not implemented in the industrial sample due to difficulties associated with holding the cutting tools in the axial direction. In particular, if an axial pulling force is applied to the cutting tool, the force is transmitted through the cutting tool to the locking element, which spreads the petals and releases the cutting tool from being fixed in the axial marking.

The angular tip (NUPM-40) is commercially available, using a fixing device in accordance with a.s. 1616645, USSR, IPC A 61C 1/10, published December 30, 1990, Bull. No. 48. This fixing device comprises a sleeve with holes for the fixing balls and a spring-loaded button with a curly ring groove that determines the position of the balls in the zone of fixation of cutting tools. Fixation of cutting tools is carried out by balls entering into the annular groove of cutting tools, preloading of balls is carried out by a figured ledge on the button.

The cutting tools are released by pressing the spring-loaded button, and the balls with their outer surface go into the annular nip) on the button and the tool is freely removed.

This design has a significant drawback - low reliability and durability at high speeds. The rotation of the cutting tool is transmitted to the balls, as a result of the surface and surfaces, and there is a rapid wear of the nests in the stationary sleeve and balls, and as a result, a malfunction. The serially raised angled tip (NUPM-40) is designed to operate at rotational speeds of up to 40,000 rpm, a locking device according to a. from. 1616645 at these speeds does not have the necessary reliability and durability and can be effectively used only at low speeds.

The technical problem of the present invention is solved by creating an angled tip with a push button latch having high reliability and durability at any rotation speeds, for which friction of surfaces during operation, and therefore wear of surfaces, is excluded in the fusion zone.

The technical problem to be solved in an angled tip with a push-button lock, containing the head housing, a hollow roller, bearings, a lock, a nut, a button, a sleeve and a spring is achieved by the fact that the lock is made in the form of a cut-off along the axis into three inserts with a coverage angle of the sleeve connected along the outer diameter with a spring ring installed in the groove, a protrusion is made on the inner surface of the sleeve, having on one side a conical surface and on the other perpendicular to the axis a surface turning into a conical hole in which with a gap there is a conical protrusion of the spring-loaded button.

The proposed technical solution meets the criterion of “inventive step, since the authors have not found a technical solution from published sources of information that has similar distinctive features that allow us to solve a given technical problem — creating an angled tip with a push button latch, consisting of three inserts cut along the axis with an angle of coverage 120 ° bushings connected to the outside diameter by a snap ring.

In FIG. 1 shows a head for a contra-angle handpiece with a push button lock;

In FIG. Figure 2 shows the assembly of the cutting tool assembly (axonometry).

The head for the contra-angle handpiece with a push-button lock (Fig. 1, 2.) contains a head housing 1 with a union nut 2., a hollow roller 4, which has a protrusion 5 transmitting torque to the cutting tool 6, is mounted on the rolling bearings on the head housing; A button 7 with a tapered protrusion 8 is located under the union nut 2, the button is pressed into the upper extreme position by a spring 9, which abuts against the bearing end 3 through the sleeve 10 at the other end 3. The clamp of the cutting tool 11 is mounted on the protruding part of the hollow roller 4 until it stops in the sub 3 and consists of a sleeve, cut along the axis into three inserts 12 with a coverage angle of 120, the inserts are connected along the outer diameter by a spring ring 13 installed in the groove 14. On the inner surface of the sleeve there is a protrusion 15 having a conical surface 16 on one side, and on the other hand, a surface 17 perpendicular to the axis, passing into a conical hole 18. There is a gap between the conical protrusion 8 of the button 7 and the conical hole 18.

The head for the contra-angle handpiece with a push button lock operates as follows. The shank of the cutting tool is inserted into the hollow roller so that the flat on the shank is aligned with the protrusion 5 and the shank end face rests on the conical surface 16 of the latch 11.

At the same time, a force is applied to the button 7 and, as a result of the force interaction of the conical protrusion 8 and the conical hole 18, the inserts 12 are moved apart in the radial direction, overcoming the action of the spring 13, as a result of which the cutting tool freely moves fully into the end surface of the protrusion 5. For a smoother and lighter the cutting tool has ledge on the protrusion 15 has a conical surface 16. When releasing the force on the button 7, the spring 9 returns the button 7 to its original position, tab 12 under the action of the spring nnogo ring 13 are closed, as a result VYST5T115 comes into the groove cutting tools, fixing the latter.

To eliminate spontaneous release of the cutting tool in the presence of axial forces on the protrusion 15, the surface 17 is made perpendicular to the axis of the latch.

Rotation from the drill through the tip roller and gearing (not shown in the figure) is transmitted to the hollow roller 4 and through the protrusion 5 to the cutting tool fixed from axial movements by the latch 11. The latch 11 rotates together with the hollow roller 4 and the cutting tool 5, therefore, friction and there is no wear in the fixation zone, high reliability of fixing the cutting tool at any rotation speed is achieved.

To release the cutting tool, it is necessary to exert force on the button 7, as a result of the interaction of the conical surfaces on the button 7 and the latch 11, the inserts 12 are moved apart in the radial direction and the cutting tool 6 is freely removed from the tip head.

The goal is to increase the reliability and durability of the head for a contra-angle handpiece with a push-button lock achieved by eliminating friction, and therefore wear in the fixation zone of the cutting tool, based on the use of a lock rotating in operation with the cutting tool.

/ s // MG97

Claims (1)

A head for a contra-angle handpiece with a push-button lock, comprising a head housing, a hollow roller, bearings, a lock, a nut, a button, a sleeve and a spring, characterized in that the lock is made in the form of a bush cut along the axis into three inserts with a swivel angle of 120 ^° , connected by the outer diameter of the spring ring installed in the groove, on the inner surface of the sleeve there is a protrusion having a conical surface on one side and a surface perpendicular to the axis, passing into a conical hole in which Shchen conical protrusion spring loaded button.