Dental implant bolt fastening structure
AssigneeHardlock Industry Co., Ltd.
InventorKatsuhiko WAKABAYASHI
Life of this patent
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Abstract
There is provided an implant having a slack prevention function by an eccentric fitting structure. An engaging shaft 53, which is decentered with a screw shaft 52, is provided at the end of an abutment screw 5, and is engaged with an engaging hole 45 provided in the bottom of a screw hole 44, into which an abutment screw 5 is screwed, and thus, the screw shaft 52 is inclined to and eccentric from the screw hole 44. Thereby, the screw shaft 52 comes to be strongly pressed partially in a circumferential direction toward the screw hole 44, so that internal stress in the horizontal direction is accumulated on the screw shaft 52. The screw 5 is threaded with maintaining prevailing torque caused by the internal stress, which enables the screw 5 to be fastened to the right position.
Claims4
A bolt fastening structure comprising:
- a base member having a screw hole and an engaging hole provided at the bottom of the screw hole, the screw hole opening in an upper surface of the base member, and, the engaging hole having a right circular cylindrical inner surface with a diameter smaller than the internal diameter of the screw hole;
- a mounting member fitted over the base member from above;
- and
- a bolt fastening the mounting member to the base member, the bolt having a screw shaft screwed into the screw hole and a bolt head having a larger diameter than that of the screw shaft;
- characterized in that the bolt further having an engaging shaft which projects downward from the end undersurface of the screw shaft and engages with the inner peripheral surface of the engaging hole;
- wherein the engaging shaft is slightly eccentric to the screw shaft, or the engaging hole is slightly eccentric to the screw shaft, so that the screw shaft is slightly eccentric from and/or inclined to the screw hole by engaging the engaging shaft with the engaging hole.
Dependencies are inferred from the claim text.