JP2008093020A - Dental hand-piece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a risk of a burn in the oral cavity of a patient by preventing a head-case lid member from being pressed down and being heated while a hand-piece is being used. <P>SOLUTION: The dental hand-piece comprises a rotary tube 30; an upper lid member 20 inside a head case for rotatably holding the upper part of the rotary tube 30; a chuck tube 40 fixed to the inner wall of the rotary tube; a chuck opening/closing member 50 for opening/closing the chuck tube 40; the head-case lid member 60; and a spring member 70 pushing the head-case lid member 60 upward. The chuck tube 40 is opened via the chuck opening/closing member by pressing the head-case lid member 60 downward against the spring member 70. At least one projection 60a is disposed on the peripheral surface of the head-case lid member 60, and a guide groove 20a for guiding the projection 60a is disposed on the peripheral surface of the upper lid member 20 inside the head case. The projection 60a is guided by the guide groove 20a in the axial direction or in the circumferential direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

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. 4 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 via the O-rings 22 and 21, respectively, and thereby the rotary cylinder 30 integrated with the inner race. The turbine blade 31 is rotatably supported in the head case 10.

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

  A chuck opening / closing member 50 that opens and closes the chuck cylinder 40 is provided at the upper portion of the chuck cylinder 40, and a pair of cones that engage with the slits 40 a of the chuck cylinder 40 are provided at the lower end of the chuck opening / closing member 50. When the chuck opening / closing member 50 is pushed downward, the cone-shaped (tapered) tip 50a interrupts the slit 40a of the chuck cylinder 40, and thereby, 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 chuck opening / closing member 50 is pushed into the slit 40a of the chuck cylinder 40, and the upper part of the chuck cylinder 40 is expanded in the radial direction to enter the chuck cylinder 40. Allows insertion and removal of cutting bar.

  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 is returned to its original position by the restoring force of the member 70, and the inserted cutting bar is gripped by the restoring force (spring force) to return to the original state above the chuck cylinder 40, and is 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 portion 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 a spring member (coil spring) 70, and the lower surface 60b of the head case lid member 60 is pressed against the upper surface 50b of the chuck opening / closing member 50 rotating at high speed. Friction heat is generated between 50b and the lower surface 60b of the head case lid member 60, and the head case lid member 60 is heated by the heat, so that the patient may be burned 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 drawbacks of the conventional handpiece chuck mechanism as described above. Specifically, the headcase lid member is pushed down during use of the handpiece. Accordingly, it is an object of the present invention to provide a dental handpiece that does not cause a burn even if the head case lid member is pressed against the head of the patient's mouth or an operator's finger or the like.

  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 a dental handpiece in which a lid member is pressed against the spring member to open the chuck cylinder via the chuck opening / closing member, the peripheral surface of the head case lid member Has at least one protrusion, and has a guide groove for guiding the protrusion on the peripheral surface of the upper lid member in the head case, and the guide groove has the protrusion in the axial direction and the circumferential direction. The groove is a guide groove.

  According to a second aspect of the present invention, in the first aspect of the present invention, a spring member that biases the head case lid member in the circumferential direction is provided between the head case lid member and the upper lid member in the head case. It is characterized by being.

  The invention of claim 3 is the invention of claim 1, wherein the spring member pressing the head case lid member upward is a coil spring, and one end of the coil spring is fixed to the head case lid member. The other end is fixed to the upper lid member in the head case, and when the head case lid member is rotated, a restoring force for returning the head case lid member to the original position is generated by the coil spring. It is what.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the guide groove includes the head case lid member, an upper position where the head case lid member does not contact the chuck opening / closing member, and the chuck opening / closing. It is between the lower position where the chuck opening and closing member can be pressed by contacting the member, and between the upper position and the lower position separated in the circumferential direction. is there.

  According to the present invention, even when a force is applied to the head case cover member during use of the handpiece, the head case cover member is not pushed downward, so that the head case cover member rotates integrally with the rotating cylinder. Since there is no contact with the opening and closing member, frictional heat is not generated in the head case lid member as in 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 structural view of a head portion for explaining an embodiment of a dental handpiece according to the present invention. In the drawing, a portion having the same function as the prior art shown in FIG. The same reference numerals as those in FIG.

  As described above, the present invention prevents the head case cover member 60 from being pushed down even if a force is applied to the head case cover member 60 during use of the handpiece. And a slit (guide groove) 20a for guiding the protrusion 60a in the vertical direction (axial direction) and the circumferential direction is provided on the upper lid member 20 in the head case. A spring member 80 that rotates the member 60 in the circumferential direction is provided, and at all times, that is, when the head case lid member 60 is pushed back upward by the spring member 70, the head case lid member 60 is pushed down. It is something that cannot be done.

  FIG. 2 is a schematic perspective view showing in detail the relationship between the head case lid member 60 and the upper lid member 20 in the head case (however, the spring member 70 shown in FIG. 1 is omitted). A spring member 80 that supports the head case lid member 60 so as to be movable in the circumferential direction is fixed between the head case lid member 60 and the upper lid member 20 in the head case, and the spring member 80 and the spring member 70 are normally provided. The head case lid member 60 is pushed up along the guide groove 20a and biased in the circumferential direction (A direction). In this state, even if the head case lid member 60 is pushed downward, The head case lid member 60 cannot be pushed downward.

  When the cutting bar is attached to the chuck cylinder 40, the protrusion 60a of the head case lid member 60 is pushed down along the guide groove 20a (the spring member 70 while rotating in the arrow B direction against the spring force of the spring member 80). Thus, the chuck opening / closing member 50 is pushed down, the upper portion of the chuck cylinder 40 is expanded in the radial direction, and the cutting bar can be inserted into the chuck cylinder 40.

  In order to push down the head case lid member 60, that is, when opening and closing the chuck, the operator must push down the head case lid member 60 while rotating against the spring force of the spring member 80. The head case lid member 60 cannot be pushed down unless a force is applied to rotate the head case lid member 60 against the spring force of the spring member 80. During use of the handpiece, for example, while the head portion of the handpiece is inserted into the oral cavity of the patient and teeth are cut, the headcase lid member 60 is rotated around the headcase lid member 60. Such a force cannot be applied, and there is no fear that the head case cover member 60 is heated.

  The example in which the spring member 80 is provided to automatically return the head case lid member 60 rotated when the chuck cylinder 40 is opened and closed to the original position has been described. However, the spring member 80 is omitted. The head case lid member 60 can be returned to the original position by the spring member 70.

  FIG. 3 is an exploded perspective view of a main part for explaining an example in which the head case lid member 60 is biased in the circumferential direction by using a spring member (coil spring) 70. In this example, a coil is used as a spring member. The spring 70 is used, the lower end 70b of the coil spring 70 is fixed to the head case upper lid 20, and the upper end 70a is fixed to the head case lid member 60. In this way, the head case lid member 60 is always Is pushed upward by the axial extension force of the coil spring 70 in the vertical direction, and is locked at a predetermined position by the unwinding force of the coil spring 70 in the circumferential direction. (Biased in the direction of arrow A). The surgeon rotates the head case lid member 60 in the direction of arrow B against the unwinding force of the coil spring 70, and simultaneously depresses the head case lid member 60 against the extension force of the coil spring 70. Then, the chuck cylinder 40 is opened and closed, and the cutting bar is inserted and removed. After the insertion / removal, the head case cover member 60 is automatically returned to the original position by the unwinding force and the stretching force of the coil spring 70.

It is a head part block diagram for demonstrating one Example of the dental handpiece by this invention. It is a principal part exploded perspective view for demonstrating operation | movement of this invention. It is a principal part disassembled perspective view for demonstrating the other Example of this invention. 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 1 ... Dental handpiece, 10 ... Head case, 11, 12 ... Bearing, 20 ... Upper lid member in head case, 20a ... Slit (guide groove), 21, 22 ... O-ring, 30 ... Rotary cylinder, 31 ... Turbine blade , 40 ... chuck cylinder, 40a ... slit, 50 ... chuck cylinder opening / closing member, 60 ... head case lid member, 60a ... projection, 70 ... spring member (coil spring), 80 ... spring member.

Claims (4)

  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 a dental handpiece that is pressed down against the opening of the chuck cylinder via the chuck opening and closing member, at least 1 is provided on the peripheral surface of the head case lid member. The guide case has a guide groove for guiding the projection, and the guide groove is a groove for guiding the projection in the axial direction and the circumferential direction. A dental handpiece characterized by being.   The dental member according to claim 1, wherein a spring member for biasing the head case lid member in a circumferential direction is provided between the head case lid member and the upper lid member in the head case. Hand piece.   The spring member pressing the head case lid member upward is a coil spring, and one end of the coil spring is fixed to the head case lid member, and the other end is fixed to the upper lid member in the head case, 2. The dental handpiece according to claim 1, wherein when the head case cover member is rotated, a restoring force for returning the head case cover member to its original position is generated by the coil spring.   The guide groove is formed between the head case lid member between an upper position where the head case lid member does not contact the chuck opening / closing member and a lower position where the head opening / closing member can be pressed by pressing the chuck opening / closing member. The dental handpiece according to claim 2 or 3, wherein the dental handpiece guides between an upper position and a lower position separated in the circumferential direction.

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