DE2524035C2 - Holder for dental treatment devices - Google Patents

Description

50

The invention relates to a holder for dental treatment devices, consisting of two in one Parting plane juxtaposed, each having a head part and a shaft part integrally connected therewith, releasably interconnected housing parts, in the head parts on a perpendicular to the parting plane rotating shaft accommodating the tool has a turbine wheel and in its shaft parts one on the Turbine-directed supply line for working air are arranged.

A holder of this type is known from DE-AS 20 19 189. He has a hollow shaft with Compressed air operated nozzle rotor, which is angled in a perpendicular to the parting plane of the housing offset cylindrical head is mounted. Only one housing part has a cylindrical bore for Receipt of the rotor, while the other housing part has no such bore.

Also known is a holder, although not of the generic type, but externally similar in appearance, according to the DE-PS 8 55 305. This has a spherical head with a tool shaft arranged therein, which over a mechanical transmission is driven and not designed as a compressed air-driven turbine. The shaft of the holder carries a drive shaft, the head of which is designed as a tooth crown and with its drive teeth in a corresponding pinion of the tool shaft, which is arranged perpendicular to this, engages This type of drive can easily be designed as a compact unit and accommodated in a ball head because the The drive shaft is located away from the ball head. Drives of this type are by far larger with Rotating pneumatic drives have been displaced.

The present invention is based on the object in holders of the type mentioned Provide previously proven ball head and dimensioned so small that the holder with the tool can be easily held, handled and adjusted and, moreover, has a low weight.

The invention looks in the features of the main claim and offers a clever accommodation the drive means and the air supply with an optimal use of space of the spherical Head. These advantages do not exist with the known holders.

Further advantageous refinements of the invention emerge from the subclaims.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawing shows

F i g. 1 is a side view of a holder for dental treatments;

2 shows a longitudinal section along the line II-1I in

3 shows a longitudinal section along the line HI-III in Fig. 2,

4 shows a side view of a modified design, partly in a vertical longitudinal section,

F i g. 5 shows a cross section along the line V-V in FIG. 4,

6 shows a cross section along the line VI-VI in FIG. 4,

7 shows a partial side view with partial, middle, vertical longitudinal section through a further embodiment and

F i g. 8 is a side view with a partial longitudinal section of a further embodiment.

In one embodiment of the invention, as shown in FIGS. 1 to 3 is shown, the holder has a Head 6, which is arranged symmetrically to a central axis 7 (Fig. 3) and externally essentially apart from a smooth transition part to a circular cylindrical socket or shaft 8 spherical is trained. Preferably, the shaft 8 and the head 6 are integrally formed and perpendicular to the Center axis 7 arranged.

The head and the shaft are divided into two housing shells along a central parting plane 9, each of which has a head part 11 or 13 and a shaft part 12 or 14 connected to it in one piece. Both housing shells are detachable in a known manner, for. B. connected by means of screws 16. Since the head and the shaft are spherical or circular-cylindrical and smooth on the outside, the head 6 can be easily operated and does not cause any difficulties in the patient's mouth.

In each of the two head parts 11, 13 suitable ball bearings 18 and 24 are arranged, the outer one Bearing ring 19 is conical so that it fits into a recess 21 or 23 of the associated head part 11, 13 can be used. Instead of placing it directly on the adjacent surfaces of the housing, the outer ring 19 has an approximately smaller diameter than the housing 11, 13 and surrounding it is axially firmly pressed against a conical, elastic cushion 22 or 26 made of an elastomer that is concentric to the central axis 7 arranged bearing 18,24 is only limited radially and axially from its intended Movable position. In this way, the bearings 18, 24 are a considerable distance from the plane of division 9 arranged remotely, aligned with one another, are isolated from the remaining part of the head 6 in terms of vibration

Since the tools are supposed to work with an air turbine, the bearings are symmetrical to the central axis 7 a rotating turbine wheel 31 is arranged. It has a hollow shaft 32 which is held in the bearings 18, 24 and as a holder for a dental drill 33 or the like.

20th

Clamping sleeve 34 held. The turbine wheel 31 has a Large number of shovels distributed over its circumference .15, which make up most of the volume of the two Take recesses 21 and 23 of the housing parts to complete. The turbine wheel 31 is in diameter much larger than the bearings 18, 24, but arranged and designed so that an imaginary shell with a spherical outline, centered in the section of the central axis 7 and the dividing plane 9 essentially enclosing the bearings and the turbine wheel.

So that the turbine is sufficiently supplied with air or the like. Working media is one of a suitable source of incoming hose 36 is connected to the end of a conduit 37, which in suitable Way is arranged partly in the lower and partly in the upper half of the shaft. The administration 37 can, because it opens in the dividing plane 9, have any cross-sectional shape, for. B. be rectangular, to enable the highest possible throughput. Near the transition point to the inner recesses 21, 23, the conduit has a special contour in order to at least partially form a nozzle 38 which is shown in FIGS. tangential direction to the blades 35 of the turbine wheel 31 is directed.

To relieve the turbine housing of superfluous ^air; If a special outlet line 39 is arranged in the head and in the shaft similar to the line 37 and -, o opens either into an outlet hose similar to the hose 36 or into the atmosphere. It is also possible to let out the air that runs through the bearings at other points, for example the head part 11 can have an axial opening 41. A corresponding opening 42 can surround the dental drill 33 and communicate with the inner recesses via the opening in the bearings.

When this device is used, the compressed air supplied through line 37 causes the turbine wheel 31 revolves around its central axis 7 and thereby the corresponding parts of the bearing, as well as the dental drill 33 offset in revolutions. Because the turbine rotates at a very high speed and the rotating parts do not can be precisely balanced, the bearings 18, 24 adjust themselves to a small extent, so that an approximately resulting vibration or noise is generally limited to the rotating mass and not can be transferred to the housing shells and shaft parts. That leaves the dentist and the dentist Patient unaffected by vibrations of this kind

It is often desirable to have water at the workplace or bring in another coolant or rinsing liquid. To do this, the outside of the head has a Water conduit 46 (Fig. 1) is provided, one end 47 of which is directed towards the dental drill 33 and the other of which The end leads to a hose 48 which is connected to a suitable source of liquid. Appropriate are the shaft parts 12, 14 surrounded by a hollow, tubular handle 49, which also the Enclosing water line 46. This provides the dentist with a suitable and comfortable grip of the Hand device mediated

Since the handle 49 extends over the hoses and connected nozzles, it is advisable to use the When dismantling the hand-held device, pull off hoses 36 and 48 beforehand and thin handle 49 to remove. The handle can also be slipped backwards over the hoses. After removing the Screws 16 can de- the interior. Hand-held device

disassembled and the air inlet and outlet ducts cleaned. The parts can then be used again inserted and the housing parts are assembled and screwed at the parting plane 9. After connection the hoses 36, 48 and attachment of the handle 49, the hand-held device is ready for operation again.

F i g. 3 shows a modification of the water supply. Here, the water line 46 is through one in the lower Shaft part 14 incorporated line 51 replaced, which has an angled outlet port 52, which on the Dental drill 33 is directed. The line 51 is incorporated in the shaft that the handle 49 lighter and better fits it.

In many cases it is desirable to connect the handset as shown in Figure 4. In this case, a connection sleeve 61, which is already present at the dentist's, is provided with a rotatable threaded collar 62 which comprises a core 63 into which an air line 64 leads. Furthermore, a water supply line 66 and sometimes also a suction air or air discharge line 67 can be arranged in the core 63. Each line is connected to an associated hose 68, 69, 71. In this case the head and shaft parts of the handset are generally as shown in Figs. 2 and 3, but also having a collar 72 against which a tubular handle 73 abuts. A sleeve 74 can be provided to pull the handle open. Usually the fit is relatively tight, although it allows the parts to be pulled off or pushed on axially. The shaft parts carry pipelines 76, 77 which are connected to the lines 37, 39 and are connected at their other ends to hoses 78, 79. In the same way, the water supply line 51 is connected to one end of a supply hose 82 via i ′ <n pipe 81.

The hoses 78, 79 and 82 are long, have good flexibility and can easily be inserted within the hollow handle 73 be accommodated. At their other ends they are connected to corresponding lines 83, 84 and 86, which are held in a plug 87, which in turn is rotatable in the one at the rear end open handle 73 is mounted. The plug 87 is against an axial separation on the one hand and to limited rotation, on the other hand, by a pin 89

secured, which is inserted in the handle and protrudes into an arcuate annular groove part 91 in the plug. The plug 87 can, for. B. in the handle 73 can only be rotated by 180 °, the rotary movement at the same time causing a corresponding twisting of the hoses> 78, 79 and 82 with it.

The plug also has a customary external thread 92 which corresponds to the internal thread of the sleeve 61. The plug is arranged so that the various hoses and lines can be connected to one another, in which case the sleeve is screwed on tightly. The handle 73 can be rotated at any time with respect to the supply lines in order to be able to operate the hand-held device in a suitable manner without the other lines, for. B. 68, 69 and 71 are rotated.

In order to easily assemble and disassemble the parts, in particular, if necessary, to also replace the hoses 78, 79 and 82 , the head 6 is held on the handle 73, preferably by means of a pull strap 96 . This can be a small helical spring or a rubber band that is hooked or otherwise fastened to eyelets, screws 97, 98 on the shaft part 12 or on the plug 87.

The assembly of the parts takes place in that they are tight are brought together, the drawstring is hooked or fastened and all parts are released and led to each other and held together in the assembled position under the belt tension jo will.

To dismantle it is only necessary to pull out the head iius the handle and the pulling strap unhooked or released.

In some cases a much simpler embodiment is appropriate. Here, the one head part 101 and the shaft part 102 on the one hand and the actual head part 103 and the shaft part 104 on the other hand can be designed on the inside essentially exactly as described above, with only an external thread 106 being provided on the shaft instead of the screws 16. Furthermore, a tubular handle 107 is provided, which in this case has an internal thread that matches the external thread 106. To assemble this device, the head parts are brought together and screwed together with the end of the handle 107. The head 101, 103 is inserted into the handle until its spherical part essentially abuts against a spherical seat bore 108 located therein. In this way, the head parts and the handle are rigidly connected to one another. At least one air supply hose 109 , which is connected to an air supply line 111 , which in turn is clamped between the shaft parts 102 and 104, is accommodated in the handle.

In most cases and for manufacturing reasons, it is desirable to divide the head so that the parting plane 9 is perpendicular to the central axis 7 of the rotating parts. But there are also other options. 8 shows a comparable embodiment with head parts 113, 116 and shaft parts 114, 117 which lie together at a common parting plane 118 which is not perpendicular to the central axis 119 of the revolving parts, but in a plane coinciding therewith. The central axis 119, ie the axis of rotation of the dental drill 121, therefore lies in the common parting plane 118.

In each embodiment according to the invention, manufacture is facilitated by the fact that, because of the parting plane 9 or 118, the individual housing parts can be designed simply. The various recesses, lines and inner walls can easily be machined with tools and do not require drilling or other comparable invisible operations. The two housing shells can be used in different ways, e.g. B. by casting or pressing.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Holder for dental treatment devices, consisting of two detachably interconnected housing parts, each having a head part and a shaft part integrally connected therewith, lying next to one another in a parting plane, in their head parts a turbine wheel on a shaft rotating perpendicular to the parting plane, a turbine wheel and in the shaft parts of which a supply line for working air directed towards the turbine wheel is arranged, characterized in that,
that the housing parts (11, 12; 13, 14 or 101, 102; 103, 104) are divided essentially symmetrically and their head parts (11, 13 or 101, 103) are hemispherical and, when assembled, have a spherical head ( 6) form, and
that in each head part (11, 13; 101,103) perpendicular to the parting plane (9, 118) and coaxially to the head (6) a stepwise tapering recess bore (21, 23) is provided, the outermost points (22) on the surface of a Head (6) are concentric, imaginary sphere, with the parts of the countersunk bores (21, 23 ) facing the parting plane (9, 118) together a cylindrical chamber for the central accommodation of a turbine wheel (31) acted upon from the outside and the remaining parts of the countersunk bores ( 21, 23) form cylindrical chambers for receiving the bearings (19, 24) for the shaft (33). 2. Holder according to claim 1, characterized in that Si each shaft part (12, 14; 102, 104) at least one to the parting plane (9, 118) open channel (37, 39) is provided, which in the assembled state at least to the turbine wheel (31) form the leading supply line for working air and that one end of a tubular handle (49, 107) is attached to the shaft parts (12, 14; 102, 104) , the other end of which carries a connecting part (87) which can be rotated and pivoted for this purpose . 3. Holder according to claim 2, characterized in that an air supply line (83) is held in the connecting part (87) which is connected to the line for working air via a flexible hose (78) placed through the handle (49, 107).