JPH0243372Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tooth crown polishing tweezers used for polishing a tooth crown.

(Prior art) This type of conventional tweezers have the same structure as normal tweezers, and have a V-shape in which the proximal ends of two clamping pieces made of strip material are fixed and the other end is open. It's nothing more than that. The crown holding portion at the open end also has a substantially triangular planar shape and its inner surface is also formed flat.

In use, one clamping piece is placed against the inner surface of the tooth crown and the other gripping piece is placed against the outer surface of the tooth crown, or both gripping pieces are opened and placed in contact with the inner surface of the tooth crown. .

(Problem to be solved) However, in the case of the above-mentioned tweezers, the 10th problem
As shown in the figure, if the object held between the tip holding parts of the holding pieces has a curved or tapered outer circumferential surface, the object may be pushed away from the open end of the holding pieces as shown by the arrow in the figure. The force that escapes to the outside acts and cannot be held sufficiently. The tooth crown has a curved outer circumferential surface and a tapered inner circumferential surface that becomes thicker toward the occlusal surface, so the above-mentioned tweezers have the disadvantage that they cannot be firmly clamped for the reasons mentioned above. be.

This also applies when both clamping pieces are used in contact with the inner surface of the tooth crown.

Therefore, when trying to hold and polish a tooth crown with these tweezers, it is difficult to adjust the rotation speed of the motor such as the lathe or end engine, the amount of extrusion into the abrasive material, or the angle of contact with the abrasive material. Otherwise, the crown of the tooth may fall off, and accurate polishing may not be possible.

In view of the problems of the prior art, the present invention aims to provide a tooth crown polishing tweezers that can hold the tooth crown firmly and perform the polishing work accurately and easily. .

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention bends the open ends of the two clamping pieces that form the tweezers body obliquely in the same direction so that they are almost parallel to each other. and the tweezers body is slanted outward.
A tooth crown outer surface holding part whose inner surface is concavely curved in the width direction is formed at the open end of one clamping piece, and the open end of the other clamping piece, which is inclined inward of the forceps body, is connected to the tooth. It is characterized by having an inner crown holding part opposite to a crown outer holding part.

The bending angle of the tip of the clamping piece is preferably about 45 degrees, and the outer surface of the bending part of the clamping piece on which the tooth crown outer surface holding part is formed is preferably a gentle concave part.

(Function) In the tweezers of the present invention, when a force is applied to close the open ends of the clamping pieces, the open ends slanted inward of the tweezers body among the open ends slanted in parallel in the same direction A force acts on the tweezers body in a direction that shifts it toward its tip, while a force acts on the outwardly inclined open end of the tweezers body in a direction that shifts it toward its bent portion. Due to these forces acting in opposite directions, the tooth crown held between the open ends is securely held without escaping from the open ends.

Moreover, a tooth crown outer surface holding portion is provided on the inner surface of the outwardly inclined open end of the forceps body, and this crown outer surface holding portion has the above-mentioned forces acting in opposite directions on both open ends. When operated, the concave curved surface in the width direction receives the outer circumferential curved surface of the tooth crown, tightly holds the tooth crown firmly thereon, and facilitates polishing work.

In addition, if a gripping piece having an open end on which a tooth crown outer surface holding part is formed has a gentle concave part on the outer surface of the bent part, the user can place his or her thumb on this part and grip both gripping pieces. , a strong force acts stably on both open ends for a long time.

(Example) Hereinafter, the present invention will be explained in detail based on an illustrated example.

1 to 3 show a tweezers according to an embodiment of the present invention. Reference numerals 1 and 2 in the figure are two clamping pieces made of band-shaped plate material, and their base ends 11,
21 is fixed and the tip is opened to form the tweezers body 3.

12 is bent outward at an angle of about 45 degrees at the open end of one clamping piece (the upper clamping piece in the figure) 1, and has a hook shape at the tip and a concave shape in the width direction on the inner surface. A curved crown outer surface holding portion 13 is formed.

Reference numeral 14 denotes a bent part of one of the clamping pieces 1, and the outer surface forms a valley shape with a gentle curve, and the part from the end to the middle part of the clamping piece is curved into a gentle mountain shape in the length direction. has been done.

Reference numeral 22 designates the open end of the other clamping piece (the lower clamping piece in the figure) 2, which is similarly bent inward at an angle of about 45 degrees and faces the crown outer surface holding part 13 almost parallel to the other. , the inner surface constitutes the crown inner surface holding portion 23.

15, 25 are base ends 11, 2 of both clamping pieces 1, 2.
A long hole is formed along the length direction in the plate surface closer to 1, and the stopper 4 is inserted into the long hole 15, 25 so as to be movable. In addition, one of the above-mentioned clamping pieces 1
A step 16 is formed on the plate surface at the portion where the elongated hole 15 is formed so that the open end side is slightly raised.

To explain how it is used, when you grip the clamping pieces 1 and 2 of this tweezers and apply force to close the open ends 12 and 22, the object clamped by both open ends 12 and 22 will move as shown in Figure 4. As shown in , the force of arrow a directed toward the user is received from one open end 12 of the tweezers main body 3 that is slanted toward the outside, and the other open end of the tweezers main body 3 that is slanted toward the inside receives the force of the arrow a toward this side. The portion 22 receives the force of arrow b directed toward the tip. If we look at the movement of the open ends 12 and 22 without anything being caught between them, as shown in FIGS.
3 is shifted toward the bent portion 14, and the crown inner surface holding portion 23 of the other open end 22 is shifted toward the tip. Therefore, when the tooth crown 5 is held between both the holding parts 13 and 23, the crown inner surface holding part 23 abuts only the tip of the tooth crown 5 on the tapered inner surface, as shown in FIG. Although the holding state is slightly unstable, when a strong force is applied in the direction of closing the open ends 12, 22, both the open ends 12, 22 shift as described above, as shown in FIG. As such, the crown inner surface holding portion 23 is in close contact with the tapered inner surface of the tooth crown 5, and the tooth crown outer surface holding portion 13 is in close contact with the outer circumferential surface of the tooth crown 5, firmly holding the tooth crown 5 from the inside and outside. It is something.

To grip the clamping pieces 1 and 2, place your thumbs in the recesses on the outer surface of the bent part 14 of the clamping piece 1 which has the crown outer surface holding part 13, and then press the outer surface of the bent part 24 of the clamping piece 2 which has the crown inner surface holding part 23. Place your index finger on the protrusion.

In this embodiment, in the state shown in FIG.
5, 25 to a position beyond the step 16, the stopper 4 is locked at the contact point by the elasticity of the clamping pieces 1, 2 in the expanding direction, and the stopper 4 is stopped at the contact point by the elasticity of the clamping pieces 1, 2 in the expanding direction. Even if the pressing force is released, the open ends 12, 22 can remain in the closed state.

Further, although the bending angle of the open ends 12 and 22 of both the clamping pieces 1 and 2 was set to 45 degrees, the angle is not particularly limited in the present invention. However, setting the angle to 45 degrees has the advantage of making polishing easier from the viewpoint of the eye position during work.

In addition, as shown in FIG. 9, in the present invention, the crown outer surface holding part 13' formed at the open end 12' of one of the clamping pieces 1' is not provided with a hook part at its tip; It is also sufficient to simply form the inner surface of the end portion into a concave shape in the width direction.

(Effects) As described above, according to the present invention, since the crown outer surface holding portion and the crown inner surface holding portion that sandwich the tooth crown are bent and inclined in the same direction so as to be almost parallel to each other, When a force is applied to close the open end, a force acts on the crown outer surface holding portion toward the bent portion, and a force acts on the crown inner surface holding portion toward the distal end, The tooth crown can be reliably held in both holding parts by the acting forces on both sides.

In addition, since the crown outer surface holding portion is formed into a curved surface that follows the circumferential curved surface of the tooth crown, it fits with the crown inner surface holding portion that is connected to the tapered inner surface of the tooth crown, and holds the tooth crown. It can be held firmly and polishing work can be performed accurately and with peace of mind.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a tooth crown polishing tweezers according to an embodiment of the present invention, FIG. 2 is a partially sectional front view of the tweezers, and FIG. 3 is a state in which the tweezers are holding a tooth crown. FIG. 4 is an explanatory diagram showing the direction of force when the tweezers are in use, FIGS. 7 and 8 are sectional views showing the movement when the tooth crown is held in FIGS. 5 and 6, and FIG. 9 is an external appearance of a tooth crown polishing tweezers according to another embodiment of the present invention. Perspective view,
FIG. 10 is an explanatory diagram showing the direction in which force is applied when the conventional tweezers are in use. 1, 1'...One clamping piece, 2...The other clamping piece,
12, 12', 22...Open end portion, 13, 13'... Crown outer surface holding portion, 23... Crown inner surface holding portion, 14, 2
4...Bent part, 5...Tooth crown, 3...Tweezers body.

Claims (1)

[Claims for Utility Model Registration] (1) The open ends of the two clamping pieces forming the tweezers body are bent obliquely in the same direction so as to be substantially parallel to each other, and are inclined toward the outside of the tweezers body. At the open end of one of the clamping pieces, a crown outer surface holding part is formed, the inner surface of which is curved concavely in the width direction, and the open end of the other clamping piece, which is inclined inward of the forceps body, is formed. A tweezers for polishing a tooth crown, characterized in that the inner surface holding portion of the tooth crown is opposed to the outer surface holding portion of the tooth crown. (2) In the tooth crown polishing tweezers as set forth in claim 1 of the utility model registration claim, the one clamping piece has an intermediate portion curved in the shape of a mountain in the longitudinal direction, and from this curved portion to the bent portion. A tooth crown polishing tweezers characterized in that a portion of the outer surface extending through the above to the crown outer surface holding portion is formed as a concave portion with a gentle curve. (3) Scope of utility model registration claims, paragraph 1 or 2
2. The tooth crown polishing tweezers according to item 1, wherein the open ends of the clamping pieces are bent at an angle of about 45 degrees substantially parallel to the same direction.