发明名称 |
Bellows lubricant pressurizer for sealed bearing rock bits |
摘要 |
This invention discloses the utilization of a metal bellows in a grease reservoir cavity that is compressed during a rock bit grease filling process to create a positive pressure differential between the internal cavities in the bit and the outside atmosphere.
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申请公布号 |
US4577705(A) |
申请公布日期 |
1986.03.25 |
申请号 |
US19840602771 |
申请日期 |
1984.04.23 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
CROSS, DONALD G. |
分类号 |
E21B10/24;F16N9/02;F16N11/04 |
主分类号 |
E21B10/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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