Dental pliers with two pliers parts, each respectively comprising one jaw of a pliers mouth and one lever arm of a pliers grip, the pliers parts pivotably connected with each other via a linkage. The linkage includes a cylindrical journal ( 26 ) on the first pliers part ( 12 ) coaxial to the pivot axis, which engages in a cylindrical bore ( 32 ) on the other pliers part ( 10 ) coaxial to the pivot axis having the same diameter, and is rotatable in this bore ( 32 ) about the pivot axis. The journal ( 26 ) and the bore ( 32 ) are axially located form-fittingly via at least one circumferential tab ( 28 ) and one circumferential groove ( 34 ). The at least one circumferential tab ( 28 ) extends only over a partial angular area of the circumference. At least one entry segment ( 36 ) corresponding to the cross-sectional shape of the circumferential tab ( 28 ) leads axially to the circumferential groove ( 34 ). The at least one circumferential tab ( 28 ) and the at least one entry segment ( 36 ) are so oriented in their angular orientation in the respective linkage area ( 22 ) or as the case may be ( 24 ), that these come into registry with each other in the open or spread position of the pliers parts ( 10, 12 ), and the at least one circumferential tab ( 28 ) can be introduced into the circumferential groove ( 34 ) through the entry segment ( 36 ) or as the case may be removed therefrom, while in the other spread positions of the pliers parts ( 10, 12 ) the at least one circumferential tab ( 28 ) engages in the circumferential groove ( 34 ) and is held form-fittingly axially therein.
1. Dental pliers, comprising:
a first pliers part;
a second pliers part, the first pliers part pivotably coupleable to the second pliers part about an axis;
a cylindrical journal ( 26 ) on the first pliers part ( 12 ) coaxial to the pivot axis;
at least one circumferential tab ( 28 ) provided on the journal ( 26 ), the at least one circumferential tab ( 28 ) extending only over a partial angular area of the cylindrical journal's ( 26 ) circumference;
a cylindrical bore ( 32 ) in the second pliers part ( 10 ) coaxial to the pivot axis and dimensioned to receive the cylindrical journal ( 26 );
at least one circumferential groove ( 34 ) in the second pliers part ( 10 ),
at least one entry segment ( 36 ) provided in the second pliers part ( 10 ) and having a cross-sectional shape of the circumferential tab ( 28 ) and leading axially to the circumferential groove ( 34 ),
wherein the first pliers part pivotably couples to the second pliers part by introducing the at least one circumferential tab ( 28 ) into the circumferential groove ( 34 ) through the entry segment ( 36 ) and the at least one circumferential tab ( 28 ) engages in the circumferential groove ( 34 ) and is held form-fittingly therein, and
wherein the at least one circumferential tab ( 28 ) and the at least one circumferential groove ( 34 ) are located at a midline of the cylindrical journal ( 26 ) and at a midline of the cylindrical bore ( 32 ); and
wherein the midline of the cylindrical journal ( 26 ) and the midline of the cylindrical bore ( 32 ) coincide and the cylindrical journal ( 26 ) is symmetric about the midline.
2. The dental pliers according to claim 1 , wherein the pivotably coupling of the first pliers part to the second pliers part is is an inlaid coupling.
3. The dental pliers according to claim 1 , further comprising a friction element ( 38 ) at an axial end surface of the circumferential groove ( 34 ).
4. The dental pliers according to claim 1 , wherein the angular positions of the at least one circumferential tab ( 28 ) and the at least one entry segment ( 36 ) are so oriented that these come into registry when the pliers parts ( 10 , 12 ) are positioned at a maximal opening angle of approximately 90 °.
5. The dental pliers according to claim 1 , wherein two circumferential tabs ( 28 ) are arranged diametrically opposed and wherein two entry segments ( 36 ) are arranged diametrically opposed.
6. The dental pliers according to claim 1 , wherein the cylindrical bore ( 32 ) extends through the second pliers part.
7. The dental pliers according to claim 1 , wherein the cylindrical bore ( 32 ) is a blind bore closed at its base.
8. The dental pliers according to claim 1 , wherein a friction element ( 38 ) is provided between a wall of the cylindrical bore ( 32 ) and a wall of the cylindrical journal ( 26 ).
9. The dental pliers according to claim 8 , wherein the friction element ( 38 ) is provided between a base of the cylindrical bore ( 32 ) and an axial end surface of the cylindrical journal ( 26 ).
10. The dental pliers according to claim 1 ,
wherein the first pliers part is formed by mortising, welding or adhering a jaw of a pliers mouth and a lever arm of a pliers grip to each other.
11. The dental pliers according to claim 10 , wherein the jaw and lever arm are produced from different materials.
12. The dental pliers according to claim 1 , wherein a portion of the first pliers part is produced by milling, turning or boring or pressure injection.
13. The dental pliers according to claim 1 , wherein the circumferential tab ( 28 ) is offset from an interface between the first and second pliers parts by a portion of the cylindrical journal ( 26 ) having a smaller diameter than a diameter of the circumferential tab ( 28 ).
14. The dental pliers according to claim 1 , wherein the circumferential tab ( 28 ) include side walls providing radial-only sliding surfaces and the cylindrical journal ( 26 ) providing the axial-only sliding surfaces.
15. The dental pliers according to claim 1 ,
wherein the second pliers part is formed by mortising, welding or adhering a jaw of a pliers mouth and a lever arm of a pliers grip to each other.
16. The dental pliers according to claim 1 , wherein the a portion of the second pliers part is produced by milling, turning or boring or pressure injection.
17. Dental pliers, comprising:
a first pliers part;
a second pliers part, the first pliers part pivotably coupleable to the second pliers part about an axis;
a cylindrical journal ( 26 ) on the first pliers part ( 12 ) coaxial to the pivot axis;
at least one circumferential tab ( 28 ) provided on the journal ( 26 ), the at least one circumferential tab ( 28 ) extending only over a partial angular area of the cylindrical journal's ( 26 ) circumference;
a cylindrical bore ( 32 ) in the second pliers part ( 10 ) coaxial to the pivot axis and dimensioned to receive the cylindrical journal ( 26 );
at least one circumferential groove ( 34 ) in the second pliers part ( 10 ),
at least one entry segment ( 36 ) provided in the second pliers part ( 10 ) and having a cross-sectional shape of the circumferential tab ( 28 ) and leading axially to the circumferential groove ( 34 ), and
wherein the at least one circumferential tab ( 28 ) is formed on an outer circumference of the cylindrical journal ( 26 ) at approximately half height of the cylindrical journal ( 26 );
wherein the circumferential groove ( 34 ) is formed at half depth of the cylindrical bore ( 32 );
wherein the cylindrical journal ( 26 ) and the cylindrical bore ( 32 ) are symmetric about an intersection line at approximately half the height of the journal and half the depth of the cylindrical bore ( 32 ).
18. The dental pliers according to claim 17 , wherein the at least one circumferential tab ( 28 ) and the circumferential groove ( 34 ) are located at a midline of the cylindrical journal ( 26 ) and the cylindrical bore ( 32 ).
19. The dental pliers according to claim 17 , further comprising a friction element ( 38 ) at an axial end surface of the circumferential groove ( 34 ).
20. The dental pliers according to claim 17 , wherein two circumferential tabs ( 28 ) are arranged diametrically opposed and wherein two entry segments ( 36 ) are arranged diametrically opposed.