SU1410966A2 - Crown hook - Google Patents

Abstract

The invention is intended for prosthetic dentistry. The purpose of the invention is to regulate the impact force. The device comprises a housing 1 with a through window 2 in which a manual drive assembly is arranged, made in the form of a flywheel 3, equipped with a pusher 5 in the form of a ratchet with teeth of different height. Between the hammer 7 and the holder 9 in the hole 8 a spring 11 is mounted with a preload. The shoulder 10 rests on the end surface of the sleeve 12 fixed relative to the body of the hammer 7. To change the impact force of the puller, the pushers 5 of the axis 4 can be made of different heights, but the magnitude must be greater than the distance from the support sleeve 13 to the limiter 18. 5 sludge. with @

Description

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19 18 u

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The invention relates to medical technology, namely to orthopedic dentistry, intended for atraumatic removal of crowns from teeth and is an improvement of the known device according to the author. St. No. 733672.

The aim of the invention is to regulate the impact force.

FIG. 1 shows the proposed corona picker with the extreme position of the impactor, the section; in FIG. 2, view A in FIG. one; in fig. 3 - puller, general view; in fig. 4 - drummer, general appearance; in fig. 5 - axis t by the pusher in the form of ribs.

The crown collector comprises a housing 1 (Figs. 1 and 2) with a through window 2 in its middle part, in which the hand drive unit is disassembled in the form of a flywheel 3 on the axis 4, equipped with a ratchet pusher 5 with various teeth heights, with the flywheel 3 connected to the axis 4 fixedly, and the axis 4 itself is installed perpendicular to the window 2 in the opening of the housing 1 by the fit. On the side surface of the pusher 5 under the action

thirty

40

the spring 6 is supported by the l-shaped protrusion of the hammer 7, while the hammer 7 is fixed in the housing 1 and provided with an opening 8 in which the end of the holder 9 with the shoulder 10 is missed. Between the hammer 7 and the holder 9 in the hole 8 the spring 11 is preloaded , wherein the shoulder 10 of the holder 9 rests on the end surface of the sleeve 12 fixed relative to the body of the striker 7 by means of; for example, a threaded connection.

On the front side of the housing 1, there is a fixed sleeve 13, which is fixed by means of a threaded joint or a press fit, between it and the spring 6 of the striker 7 is placed a ring 14 with a button 15 radially mounted in it, the body of which is passed through the longitudinal groove 16 of the housing 1, whereas the longitudinal groove 16 of the housing 1 has one or more locking notches 17 (FIG. 2) and a dp of the body of the button 15 (FIG. 2). In addition, the holder 9 at a distance of about 0.3 mm from the support sleeve 13 has a stop 18 (FIG. 1) in the form of a ring or a pin, and from the front side the holder 9 has a threaded hole 19,

45

50

55

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0 5 0

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five

0

five

in which, before operation, the puller 20 is screwed with the end hook 21 (Fig. 3). To change the impact force of the puller 20, the pushers 5 of the axis 4 can be made of different heights, but the absolute value is necessarily longer than the distance from the support sleeve 13 to the limiter 18.

Crown pickup works as follows.

The end grip 21 of the puller 20 connected to the holder 9 grip the end of the tooth crown, then the thumb and index fingers of the hand holding the body 1 begin to rotate the flywheel 3 counterclockwise (Fig. 1), while turning the side surface of the pusher 5 when the axis 4 rotates The firing pin 7 is pressed to the forward position together with the holder 9 and the puller 20. The holder 9 and the puller 20 move up to the stop of the limiter 18 into the body of the support sleeve 13 and only the spring 6 is compressed all along the way. springs 6 and 11 until the pusher 5 passes through the body of the L-shaped protrusion of the striker 7, then under the action of the springs 6 and 11 the striker 7 is thrown into the rear extreme position (Fig. 1) and at the final stage when a certain kinetic energy is reached, a sharp blow occurs the hammer 7 through the sleeve 12 along the shoulder 10 of the holder 9, as a result of which instantaneous operation of the holder with the puller 20 is achieved in the order of 0.3 mm and thus the crown is knocked off the body of the tooth. After the triggering, the L-shaped projection of the striker 7 enters the supporting contact with the next push rod 5 of axis 4, the system comes to an equilibrium state and the cycle of movement and actuation repeats.

During one revolution of the flywheel 3, the number of operation cycles is equal to the number of pushers 5 of axis 4. For the given variant, the number of pushers is six. To increase the impact force, the button 15 for its head, together with the ring 14, is retracted along the longitudinal groove 16 of the housing 1 towards the striker 7, while the spring 6 is preloaded, while the other structural elements are in a stationary position.

31

Dp of the selected position button 15 is inserted into the fixed cutout 17.

The proposed crown picker increases safety in operation, as it provides the ability to change the impact force due to the insertion of a movable ring with a button and due to the possibility of making pushers of different heights, and at the same time, the L-shaped height of the pushers increases the reliability of the product.

Figm

109664

Claims (1)

Invention Formula Crown picker aut. St. No. 733672, characterized in that, in order to regulate the impact force, it is provided with a ring with a button located between the sleeve and the spring of the hammer, and the manual drive assembly 10 is designed as a ratchet with teeth of various heights. go : 21 Fig.Z