DE2359506A1 - Dental instrument holder - has at least two parts releasably connected by quick acting coupling - Google Patents

Abstract

Dental tool holder comprises at least two parts releasably connected by a coupling. To each of the two coupling members which are pref. screw coupling members, can be connected an intermediate coupling element. The two intermediate coupling elements can be coupled together to form a quick-acting intermediate coupling, e-g. of the bayonet type. Wear and tear on the screw coupling is reduced. The instrument holder can be driven by air, a small electric motor or mechanically by a driving shaft laid in the inside of the holder. For the former drive form a turbine is provided in the hollow shaft.

Description

The invention "relates to a zannär ζ tliohes handstüofc that consists of at least two parts detachably connected to one another with the aid of a coupling "consists of *

Such a handpiece is: e.g. through the DT-PS 1.116.86ο "known. In this" known handpiece "the coupling elements of the coupling consist of those facing each other Ends of the handpiece parts to be connected to one another are provided, interengageable screw threads, which are designed as "fine threads. It is now necessary that dental handpieces, especially the rotating and Storage parts must be provided with a care product. For this purpose, the rear Hanästückteil is released by releasing the a fine thread existing coupling from the rest of the Hanästückteil separated, so that one of the then free end of the handpiece from a care product into the interior of the handpiece E.g. spray in, whereupon this care agent reaches the parts to be cared for in the handpiece tip. ..: · ■ "■; ■; ':

It has now been shown that the loosening of the! existing coupling is very time consuming and that

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in addition, especially when joining the two handpiece parts destruction or damage to the fine thread can be done. Because the dental handpiece is serviced up to several times a day must, the time required for this is relatively long.

The invention is based on the object of creating a dental handpiece of the type mentioned at the beginning, which is maintained quickly and without the risk of damaging the coupling elements without changing its design can be.

To solve this problem it is proposed according to the invention, that an intermediate coupling element can be firmly connected to each of the two coupling elements which can be connected to one another is that forms an intermediate coupling with the corresponding intermediate coupling element, so that the The first-mentioned coupling elements are bridged by the intermediate coupling, the first-mentioned coupling elements designed as a clutch to be operated slowly and the intermediate coupling elements as a clutch to be operated quickly

det are. !

With the invention it is possible that a conventional \

dental handpiece without changing its design j

by simply actuating the bridging device provided;

Zwisohenkupplung and subsequent separation of the before;

interconnected handpiece parts with one of the "coupling end care product to be introduced into the inside of the handpiece can be provided.

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Mile are also possible in which, e.g. for safety reasons, the first-mentioned coupling elements are used in reverse as a quick-action coupling and the intermediate coupling elements designed as a slowly actuated clutch are.

The coupling elements expediently close slowly actuating coupling made of screw threads, e.g. according to Art the coupling elements known from the aforementioned DT-PS 1.116.86o. Such a screw thread can be tightened so firmly that when operated quickly the intermediate coupling, an actuation of the slowly actuated clutch is excluded.

In some cases, the coupling elements of the quick-acting coupling consist of a bayonet lock. Such a bayonet lock is made so robust that damage to the coupling elements is excluded.- \ ■ ■ .-; - -.

There is a further development of the last-mentioned embodiment in that the one coupling element of the sehneil to be actuated coupling consists of a sleeve, the outside with at least one bayonet slot is provided, and that the Another coupling element consists of a tubular piece that can be engaged in the sleeve and on which it is rotatable and longitudinally movable to a limited extent a bayonet ring is arranged. This design has the advantage that the pipe section which can be engaged in the sleeve especially with pneumatically driven handpieces tight passage of the pneumatic media guaranteed.

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In the drawing, an embodiment of the invention is shown as an example. The drawing shows a two-part Dental handpiece with an intermediate coupling arranged between the "two handpiece parts" in a longitudinal section.

The two handpiece parts to be connected are designated in the drawing by 1 and 2 ". The handpiece part 1 is the so-called grip sleeve of a dental handpiece, in its free end, not shown, a dental handpiece Tool, e.g. a drill, is rotatably mounted. In the illustrated embodiment, the drive of the dental Tool by a turbine receiving the tool in its hollow shaft, which by means of the line 3 supplied compressed air is set in rotation. The line 4 is a coolant line. the exhaust air flowing back from the turbine, not shown passes through the space 5 of the handpiece part 1 via exhaust air openings 6 and a ring channel 7 in the open.

The handpiece part 2 is a connecting piece which is used to connect the handpiece to a not shown Supply smart eh. Serves.

The handpiece part 1 is on his right in the drawing End provided with an external thread 8, which pieces in the known hand with an internal thread 9 in engagement can be brought, which is on the inner wall of a free rotatable but not longitudinally movable on the handpiece part 2 located rotary ring IO.

The two threads 8 and 9 therefore represent coupling elements.

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In the illustrated embodiment, however, is between the between the two coupling elements 8 and 9, an intermediate coupling, generally designated 11, is interposed, which to a certain extent the coupling elements 8 and 9 bridged.

For this purpose, there is an intermediate on each of the threads 8 and 9 coupling element 12, 13 firmly screwed, which with the corresponding dual clutch element 13 or 12 the intermediate coupling 11 forms.

The Zwisohenkupplung 11 can be operated quickly as a result Coupling formed that the coupling element 12 from consists of a sleeve with two bayonet slots on the outside 14, 15 is provided, the other coupling element 13 consists of a tubular piece that can be engaged in the sleeve, on which a bayonet ring 16 is arranged to be rotatable and longitudinally movable to a limited extent. The bayonet ring 16 has two bayonet pins 17, 18 for engagement in the bayonet slots 14, 15.

The tube piece is provided with Durohtrittsrohren 19, 2o, ■■ which are aligned with the lines 3, 4 before the actual coupling operation. Thereafter, only the bayonet ring needs to be rotated until the bayonet pins 17, 18 engage with the bayonet slots 14, 15 and move into the end position in them. A sealing washer 22 provided between the intermediate coupling element 13 designed as a tubular piece and an inner transverse wall 21 of the handle part 1 also serves as a spring when the bayonet lock is tightened.

When loosening the bayonet lock by turning the

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. Bayonet ring 16 in the opposite direction is a loosening of the Coupling elements 8, 9 avoided because the latter are tightened sufficiently tight as a result of their design as a thread can.

Although a dental handpiece for air drive is shown in the drawing, the embodiment shown is the coupling elements are of course also possible with those dental Hanästucken in which the drive with the help of a small electric motor or mechanically with the help of a drive shaft mounted inside the handpiece he follows.

- 7 claims

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Claims (1)

- 7 .- claims Dental handpiece consisting of at least two releasably connected to one another with the aid of a coupling Parts, characterized in that on each of the two coupling elements that can be connected to one another (8, 9) an intermediate coupling element (12, - I3) can be firmly connected to the corresponding Intermediate coupling element (13 or 12) an intermediate coupling (i1) forms, so that the first-mentioned coupling elements (8, 9) through the intermediate coupling (11) are bridged, the first-mentioned coupling elements (8, 9) as a slow-actuated clutch and the intermediate coupling elements (12, I3) as fast to be operated clutch are formed. . Dental handpiece according to claim 1, characterized in that the coupling elements (8 ^ 9) of the slowly actuated coupling consist of screw threads. . Dental handpiece according to claim T or 2, characterized in that the coupling elements the (12, 13) of the quick to operate / clutch from one Bayonet lock exist. · · . Dental handpiece according to claim 3, characterized in that the one coupling element (12) the quick-acting coupling consists of a sleeve with at least one bayonet slot on the outside (14, 15) is provided, and that the other coupling element (13) consists of an engaging in the * sleeve Pipe section consists on which rotatable and limited A bayonet ring (16) is arranged to be longitudinally movable. The P 509824 / 00A3 Empty bar ife