| 摘要 |
<p>There is disclosed a dust seal for a tool device, including a bit receiving end, which comprises typically, an elastomeric material such as neoprene and includes a first end portion having a first axially extending opening of predetermined dimension and having a shape and contour which complements and cooperates with the aligned surface of the tool bit. The predetermined dimension is selected so as to create a first interference fit with the tool bit. The seal includes a second end portion axially disposed from the first and connected thereto. The latter includes a second axially extending opening, again of predetermined dimension which has a shape and contour which complements and cooperates with the aligned surface of the bit receiving end. The dimension of this second opening is selected to as to provide a second interference fit with the aligned surface of the bit receiving end, the second interference fit being lighter than the interference fit formed between the first end portion of the seal and the bit shank. The difference in interference fits allows for the seal to move substantially in unison with the bit while slipping upon the contacted surface of the bit receiving end. Cooperative action between a surface of the second end portion and a flange on the bit receiving end ensures retention of the seal upon the tool device when the bit is removed from the tool.</p> |
