Patent ID: 8579629
Filing Date: 2013-11-12
Classification: A61C

Abstract:
1. A dental handpiece comprising: a head housing, a gear shaft accommodated in the head housing, and having a gear part with gear teeth and a shaft part extending from said gear part, a dust control seal sealingly fit on a circumferential surface of said shaft part of the gear shaft, a retaining member for rotatably retaining said gear shaft in the head housing, and a fixing member for fixing the retaining member in the head housing, wherein said dust control seal is an annular member, and has a seal body, a first lip projecting radially inwardly from the seal body, and a second lip projecting radially inwardly from the seal body above and spaced apart from said first lip, wherein said first and second lips define a space between a contact area between the first lip and the shaft part and a contact area between the second lip and the shaft part, and wherein said dust control seal is held between the retaining member and the fixing member.