Bleeding protective casing assembly for bearing system
US3937494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1973 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Sep 13, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7889
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bearing system for relatively rotatable liquid conduits such as a rotating sprinkler head mounted on a fixed riser, including a two-piece casing assembly for shielding operative parts of the bearing from intrusion of external dirt and water-borne abrasive material, while permitting leakage liquid within the casing assembly to bleed outwardly, thereby preventing excessive liquid pressure in the assembly. The illustrative system includes a bearing housing having a central vertical bore and a tubular spindle rotatably mounted in the bore and projecting thereabove for attachment to a sprinkler head. The system includes spaced upper and lower seals between the fixed and rotating parts, and an external helical spring for maintaining the seals under compression, thereby minimizing entry of outside dirt and water-borne abrasive material into the annular space between the spindle and bore. A protective casing assembly forms a chamber about the spring, and includes a lower cup-shaped annular case surrounding the lower portion of the spring and having a lower internal flange underlying the spring, and an upper annular cap surrounding the upper portion of the spring and case, and provided wi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.