DE1227611B - Cords for dental instruments - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

A61c

German class: 30 b -1/04

Number:
File number:
Registration date:
Display day:

K45749IXd / 30b
January 23, 1962
October 27, 1966

The invention relates to a cord for dental instruments, usually on The end of the rod arm carrying the instrument is a coupling attachment for the articulated sliding connection or for cord-driven handpieces or contra-angles.

As a result of the handpiece or angle piece or through the joint sliding connection and through the The load formed by the coupling approach must be carried out by the dentist when holding or swiveling up the instrument supporting rod arm and especially when working relatively much force expended as a result of which the sensitivity of the dental work is impaired.

There are already known cords of the type mentioned to overcome this disadvantage, in which the rod arm carrying the instrument and the adjacent rod arm hinged to it pulled against each other under the action of a tension spring arranged between these two rod arms will. The tension spring is in a known embodiment with its two ends on each one of the wound up both rod arms and extends in the vicinity of the rod joint free from one Link arm to the other. This arrangement has the disadvantage that on the one hand the extended Spring can be overstretched when pivoting the two rod arms and on the other hand the spring buckles to the side when the rod arms are pivoted together. This is based on that the spring in the area of its free-running section because of the pivoting the rod arms available small distance between the two arms in order to avoid a excessive lateral buckling cannot be long enough to prevent overstretching or Prevent stretching when pulling apart. On the other hand, there is a certain minimum length of the spring required in the area of its freely running section so that the spring effect is effective at all comes, whereby the lateral buckling cannot be avoided. There is also the disadvantage that the spring is free at the transition from the sections wound on the rod arms to the running section is kinked strongly at an angle, so that at these kinks after a short time Fractures can occur.

There are also cord linkage known in which a spiral spring is provided, which approximately in their center wrapped around a pin of the linkage and with their correspondingly shaped Ends is hooked with the rod arms. at

Cords for dental instruments

Applicant:

Kaltenbach & Voigt, Biberach / Riss

Named as inventor:
Hans Loge, Biberach / Riss

In this arrangement, the spring ends move when the rod arms are pivoted on these arms, because this is done winding and unwinding around the aforementioned pin, causing very strong scratching the spring ends takes place on the respective rod arm. As a result, the mostly high-gloss chrome-plated Link arms severely impaired. In addition, in the known arrangement, in particular in the event of large swiveling of the rod arms, the spiral spring will quickly weaken. aside from that the dentist can easily injure himself from the exposed sharp spring ends.

The invention has set itself the task of avoiding the arrangement of both a tension spring and the known spiral spring with the associated disadvantages.
To solve this problem, the invention is based on a cord rod for dental instruments, in which the rod arm carrying the instrument and the adjacent rod arm are each individually mounted on a hinge plate and are moved against each other under the action of at least one spiral spring. This cord linkage is characterized according to the invention in that the spiral spring is articulated with its two ends to the adjacent ends of the rod arm, the points of application of the spiral spring always being outside the connecting line passing through the pivot points of the rod arms.

With the proposed design, scratches from the spring ends are definitely avoided, because the spring ends are fixed by their articulated attachment to the rod arms. According to the invention arranged spiral spring can work freely over its entire length, and its spring travel is so small that overstretching can be ruled out with certainty. By the fact that the spring ends are fixed and do not end free, there is no risk of injury.

It is also achieved by the invention that

609 708/6

a lateral buckling of the spring, as can occur with tension springs, is avoided.

XJm with security also only insignificant scratches on the rod arms due to the easy To avoid the spiral spring sliding over the rod arm, the spiral spring is expediently given a protective cover.

According to an advantageous development of the invention, on both sides of the rod joint is depending arranged a spiral spring. This results in a symmetrical loading of the rod arms reached by the springs.

The spiral spring can expediently be used as an extension spring be trained.

This keeps the stress on the spring particularly low, since there is no significant preload the spring is required.

In the drawing, embodiments of the invention are shown by way of example. It shows

F i g. 1 a cord rod for dental instruments with arranged on the rod joint Spiral springs, viewed from the side,

F i g. 2 shows the embodiment according to FIG. 1 in 90 ° rotated view and

F i g. 3 shows an excerpt from the illustration according to FIG. 1 with the boom arms swung apart.

With 1 is in the drawing of a coupling approach 2 for the dental instrument, not shown bearing linkage arm called. The rod arm 1 is via a joint 3 with another Link arm 4 connected. At the ends of the rods 1 and 4 facing the joint 3 Sleeves 5 and 6 arranged in which the rod arms 1 and 4 are rotatably mounted. The sleeves 5 and 6 are provided with the joint 3 overlapping caps 7 and 8, which protect the hollow in the Rods 1 and 4 running hose lines 9 are used for water and / or air. In the same Way, the other end of the link arm 4 is formed, the arrangement being made in this way can that the link arm 4 can not rotate in the sleeve 6 '. The protective cap on the mentioned the other end is denoted by 8 '.

The cord used to drive the instrument, not shown, is numbered 10 and the associated cord Cord rollers are denoted by 11. Both the line rollers 11 and the protective caps 7 and 8 or 8 'of the sleeves 5 and 6 or 6' are rotatably mounted on a hinge plate. The hinge plate for the cord rollers 11 and the protective caps 7 and 8 on the joint 3 is designated by 12.

13 with a hook attached to the rod arm 4 is designated, which is used for hooking the articulated sliding connection or the Dorio handpiece or angle piece is used in the rest position.

As can be seen in the drawings, at least one spring is arranged on the linkage joint 3, which acts directly on the ends or protective caps 7, 8 of the linkage arms 1, 4 and exerts opposing torques on the linkage arms 1 and 4. The torques act in such a way that the rod arms 1 and 4 move from the pivoted-apart state, for example according to FIG. 3, into the pivoted-together state, e.g. B. according to FIG. 1, move against each other or that they support this movement against each other.

The spring arranged on the joint 3 consists of a spiral spring 14 designed as a stretch spring, which is hinged at its ends to the ends 7 and 8 of the linkage arms 1 and 4. Like F i g. 2 shows the spiral spring is arranged in pairs, one on each side of the linkage joint 3. The articulated one Fastening is with the help of inserted into the side walls of the protective caps 7 and 8 Screws 15 accomplished. The screw heads

ίο have from the side walls of the protective caps 7 and 8 such a distance that the ends of the spiral springs 14, which are bent to form loops can rotate freely around the screw neck. According to FIG. 2 and 3, each spiral spring 14 has a protective cover 16, which scratches the high-gloss chrome-plated outside of the protective caps 7 and 8 prevented.

In particular from FIG. 3 it can be seen that the bending springs 14 on the rod arms 1

ao and 4 exerted to the pivot points 17 and 18 of the linkage arms 1 and 4 acting torques are directed in opposite directions, namely the torque exerted on the link arm 1 acts clockwise and the torque exerted on the link arm 4 counterclockwise. The direction of rotation of the torques is indicated by arrows I and IV.

In the illustration according to FIG. 3 is the front line pulley for the sake of clarity omitted. Only their bearing bore 19 can be seen. The back line roll is at 11 and hers Bearing bore designated by 21. In Fig. 3 is another stop pin 22 for the protective caps 7 and 8 can be seen, which is intended to cause the linkage arms 1 and 4 pivoted apart in a symmetrical position to the hinge plate 12 will.

Claims (4)

Patent claims: 1. Cord for dental instruments, in which the one carrying the instrument Linkage arm and the adjacent linkage arm are each mounted individually on a joint plate and are moved against each other under the action of at least one spiral spring, characterized in that that the spiral spring is articulated with both of its ends to the adjacent ends (7, 8) of the linkage arms (1, 4), wherein the points of application (15) of the spiral spring are always outside of the pivot points (17,18) of the rod arms (1, 4) are located connecting line. 2. Cord linkage according to claim 1, characterized in that the spiral spring (14) has a protective sheath (16). 3. Cord linkage according to claim 1 and / or 1, characterized in that a spiral spring (14) is arranged on both sides of the linkage joint (3). 4. Cord linkage according to one or more of claims 1 to 3, characterized in that that the spiral spring (14) is designed as a stretch spring. Considered publications: U.S. Patent No. 2,246,530. 1 sheet of drawings