JP4722809B2 - Dental handpiece - Google Patents

Description

  The present invention relates to a dental handpiece having a chuck mechanism to which a cutting bar such as a micro engine or an air turbine can be detachably attached. More specifically, the present invention relates to a patient's oral cavity or an operator during dental treatment. The present invention relates to a dental handpiece having a chuck opening / closing mechanism in which there is no risk of burns on the fingers.

FIG. 5 is a cross-sectional view of a head part for explaining an example of a conventional dental air turbine handpiece as an example to which the present invention is applied. In the figure, reference numeral 10 denotes a head provided at the tip of the handpiece 1. A case 20 is an upper lid member in the head case screwed to the head case 10 at an upper portion in the head case 10, and 30 is a rotating cylinder. The rotating cylinder 30 is connected to the inner race of the bearings 11 and 12 and the inner race The outer races of these bearings are fixed to the head case 10 and the upper lid member 20 in the head case 20 through O-rings 21 and 22, respectively, thereby rotating the cylinder 30 integral with the inner race. The turbine blade 31 is rotatably supported in the head case 10.

  A chuck cylinder 40 is integrally fixed below the inner side of the rotary cylinder 30, but the inner peripheral wall of the rotary cylinder 30 and the outer peripheral wall of the chuck cylinder 40 have a gap G in the upper portion, and the chuck cylinder 40 For example, a pair of slits 40a are provided on the peripheral wall so as to face each other over the length in which the gap G is provided.

  A push member (chuck opening / closing member) 50 for opening and closing the chuck cylinder 40 is provided on the upper portion of the chuck cylinder 40, and a lower end portion of the push member 50 is engaged with the slit 40 a of the chuck cylinder 40. A pair of conical (tapered) tip portions 50a are provided, and when the pressing member 50 is pushed downward, the conical (tapered) tip portions 50a interrupt the slit 40a of the chuck cylinder 40, Thus, the upper portion of the chuck cylinder 40 is expanded in the radial direction, so that, for example, a tooth cutting bar can be inserted into and removed from the chuck cylinder 40.

  Reference numeral 60 denotes a lid member of the head case 10, and reference numeral 70 denotes a spring member that normally pushes the head case lid member 60 upward. When the cutting bar is inserted and removed, the surgeon applies the spring force of the spring member (coil spring) 70. Against this, the head case cover member 60 is pushed downward. When the head case lid member 60 is pushed down, the tip end detail 50a below the push member (chuck opening / closing member) 50 pushes the upper portion of the chuck cylinder 40 in the radial direction, and the cutting bar can be inserted into and removed from the chuck cylinder 40. To.

  As described above, after the head case lid member 60 is pushed down and the cutting bar is inserted into the chuck cylinder 40, when the force pushing the head case lid member 60 is removed, the head case lid member 60 is spring-loaded. The cutting bar returned to the original position by the restoring force of the member 70 is held by the restoring force (spring force) to return to the original state above the chuck cylinder 40 and held in that state. In this state, that is, in a state where the cutting bar is chucked by the chuck cylinder 40, the teeth are cut. Similarly, when the cutting bar is removed, the head case lid member 60 is pushed down, the lower end 50a of the chuck opening / closing member 50 is inserted into the slit 40a of the chuck cylinder 40, and the upper side of the chuck cylinder 40 is expanded in the radial direction (chucking). Open) and pull out the inserted cutting bar.

  In the conventional dental handpiece, when the user inadvertently presses the head case lid member 60 into the oral cavity of the patient, for example, while the rotary cylinder 30 is rotating at high speed, the pressure is reduced. As a result, the head case lid member 60 depresses the spring member (coil spring) 70, and the upper surface 50 b of the push member (chuck opening / closing member) 50 while the lower surface 60 b of the head case lid member 60 is rotating at high speed is As a result of the pressing, frictional heat is generated between the upper surface 50b of the pressing member (chuck opening / closing member) 50 and the lower surface 60b of the head case lid member 60, and the head case lid member 60 is heated by the heat. May cause burns in the oral cavity. Similarly, even when an operator who is in charge of treatment accidentally presses the head case lid member 60 against a finger or the like during the operation of the handpiece, the finger or the like may be burned.

  An object of the present invention is to provide a dental handpiece that eliminates the disadvantages of the conventional handpiece chuck mechanism as described above. Specifically, during use of the handpiece, the head case lid member 60 is provided. An object of the present invention is to provide a dental handpiece that does not cause a burn even if the inside of a patient's mouth or an operator's finger or the like is pressed against a lid member without being pushed down.

According to a first aspect of the present invention, there is provided a rotary cylinder that is rotatably held in the head case, an upper lid member in the head case that rotatably holds an upper portion of the rotary cylinder in the head case, and an inner wall of the rotary cylinder. A fixed chuck cylinder, a chuck opening / closing member that engages with the chuck cylinder and opens / closes the chuck cylinder, and is rotatably disposed on an upper portion of the head case and movable in the axial direction of the rotary cylinder. A head case lid member provided, and a spring member interposed between the upper lid member in the head case and the head case lid member to push up the head case lid member. in dental handpiece as by pressing against the lid member to the spring member to open the chuck cylinder via the chuck opening and closing members, the head casing lid member A convex portion (or a concave portion) at at least one location in the circumferential direction, and a concave portion (or a convex portion) that passes through the convex portion (or concave portion) in the lower circumferential direction of the head case lid member The chuck cylinder can be opened by allowing the head case lid member to be pressed when the portion and the concave portion (or the concave portion and the convex portion) coincide with each other.

According to a second aspect of the present invention, in the first aspect of the invention, the peripheral surface of the head case lid member has at least one protrusion, and the peripheral portion of the upper lid member in the head case has the protrusion. A guide groove for guiding is provided, and the guide groove is a groove for guiding the protruding portion in the axial direction and the circumferential direction.

According to a third aspect of the present invention, in the first or second aspect of the invention, a mark indicating a position at which the head case lid member can be pressed is attached to the outer peripheral portion of the head case and the outer peripheral portion of the head case lid member. It is characterized by being.

  According to the present invention, even when a force is applied to the head case lid member 60 during use of the handpiece, the head case lid member 60 is not pushed downward. Since the chuck opening / closing member 50 that rotates integrally is not contacted, frictional heat is not generated in the head case lid member 60 unlike the conventional handpiece. Therefore, even if the head case cover member is inadvertently touched during use of the dental handpiece, there is no risk that the patient or treatment worker will be burned, and it is safe.

  FIG. 1 is a block diagram of a head for explaining an embodiment of a dental handpiece according to the present invention. In the figure, the same function as that of the prior art shown in FIG. The same reference numerals as those in FIG. FIG. 2 is a schematic perspective view showing the relationship among the head case lid member 60, the head case inner lid member 20, and the spring member 70 interposed between the head case lid member 60 and the head case inner lid member 20. is there.

In the embodiment shown in FIGS. 1 and 2, on the upper surface of the head case in the upper cover member 20, the projections extending over a predetermined given on a radius D in the circumferential direction length L (convex) 20 ₂ The portions where these protrusions 20 ₂ are not provided are notches (recesses) 20 ₁ . On the other hand, a concave portion 60 ₂ and a convex portion 60 ₁ are provided on the lower surface of the head case lid member 60 in accordance with the convex portion and the concave portion provided in the upper lid member 20 in the head case. Here, if the distances D, D ₁ , D ₂ in the radial direction (from the center) where these are provided are D ₁ > D, D ₂ <D, the convex portion 20 of the upper lid member 20 in the head case 20 ₂ and the recessed portion 60 ₂ of the head case cover member 60 are completely aligned with each other in the circumferential direction, the head case cover member 60 can be pushed down against the spring member 70, thereby opening the chuck cylinder 40. be able to. However, in a position shifted from that position, the projecting portion 60 ₁ of the head case cover member 60 causes hitting the projections 20 ₂ of the head case in the upper lid member 20 can not be pushed the head case cover member 20.

  As described above, since the head case lid member 60 can be pushed down only at a predetermined point in the circumferential direction, the head case lid member 60 is rotated to the predetermined position only when the chuck is opened and closed. At other times, if the head case lid member is rotated and shifted from the predetermined position, the head case lid member 60 will not be accidentally pressed. There is no worry that the surgeon will get burned.

  FIG. 3 is a cross-sectional view of a head section for explaining another embodiment of the present invention, and FIG. 4 is an exploded perspective view of the head case lid member 60 and the upper lid member 20 in the head case of the embodiment shown in FIG. (The spring member 70 is omitted). Thus, in this embodiment, the protrusion 60a is provided in the peripheral portion of the head case lid member 60, and the guide groove for guiding the protrusion 60a in the vertical direction (axial direction) and the circumferential direction on the upper lid member 20 in the head case. 20a is provided so that the head case lid member 60 cannot be pushed down at all times, that is, when the head case lid member 60 is pushed back upward by the spring 70.

  In FIG. 4, the head case cover member 60 is normally rotated in the direction of arrow A. In this state, even if the head case cover member 60 is pressed, the head case cover member 60 can be pressed down. Therefore, there is no possibility that the head case lid member 60 contacts the chuck opening / closing member rotating at high speed. When opening and closing the chuck, the operator manually opens and closes the chuck by pressing the head case lid member 60 while rotating the head case lid member 60 in the direction of arrow B. After opening and closing the chuck and inserting / removing the cutting bar, if the head case lid member 60 is rotated in the direction of arrow A, the head case lid member 60 cannot be pushed down as described above, There is no fear that the patient or surgeon will be burned.

  As described above, the present invention is such that the head case lid member 60 can be depressed only when the head case lid member 60 is at a predetermined position in the circumferential direction. It is difficult to find the predetermined position. Therefore, as shown in FIGS. 1 and 3, marks 10c and 60c are provided on the outer peripheral surface of the head case 10 and the outer peripheral surface of the head case cover member 60, and only when the positions of these marks coincide with each other, the head case cover If the member 60 can be pressed, the positioning of the head case lid member is facilitated, and the cutting bar can be easily inserted and removed.

It is a head part block diagram for demonstrating one Example of the dental handpiece by this invention. It is a principal part disassembled perspective view for demonstrating operation | movement of the Example shown in FIG. It is a head part block diagram for demonstrating the other Example of this invention. It is a principal part disassembled perspective view for demonstrating operation | movement of the Example shown in FIG. It is a head part block diagram of the conventional dental handpiece as an example to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Head case, 11, 12 ... Bearing, 20 ... Upper lid member in head case, 21, 22 ... O-ring, 30 ... Rotating cylinder, 31 ... Turbine blade, 40 ... Chuck cylinder, 50 ... Chuck opening / closing member, 60 ... Head Case lid member, 70... Spring member.

Claims (3)

A rotating cylinder that is rotatably held in the head case, an upper lid member in the head case that rotatably holds an upper part of the rotating cylinder in the head case, and a chuck cylinder fixed to an inner wall of the rotating cylinder; A chuck opening / closing member that engages with the chuck cylinder and opens / closes the chuck cylinder, and a head case cover member that is rotatably disposed on an upper portion of the head case and movable in the axial direction of the rotation cylinder. And a spring member that is interposed between the upper lid member in the head case and the head case lid member and pushes the head case lid member upward, and the head case lid member is used as the spring member. in dental handpiece as by pressing by an anti-opening the chuck cylinder via the chuck opening and closing members, less of the upper circumferential direction of the head casing lid member Has a convex portion (or concave portion) at one location, and has a concave portion (or convex portion) passing through the convex portion (or concave portion) in the lower circumferential direction of the head case lid member, and the convex portion and concave portion ( The dental handpiece is characterized in that, when the concave portion and the convex portion) coincide with each other, the head case lid member can be pressed to open the chuck cylinder.   The peripheral surface of the head case lid member has at least one protrusion, and the peripheral surface of the upper lid member in the head case has a guide groove for guiding the protrusion, and the guide groove The dental handpiece according to claim 1, wherein the dental handpiece is a groove that guides the protrusion in the axial direction and the circumferential direction. 3. The mark according to claim 1, wherein a mark indicating a position where the head case cover member can be pressed is attached to an outer periphery of the head case and an outer periphery of the head case cover member. Dental handpiece.

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