Bearing unloading mechanism for disc clamping unit
US4627288A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Aug 12, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/0287
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bearing unloading mechanism for a disc clamping unit utilized in rigid disc certifiers or testers comprises a hollow spindle (12) containing a pulling rod (20) which slides in the spindle. The upper end of the pulling rod carries a clamping element (26) for clamping a disc (D) to be tested or certified. There is a first compression spring (32) arranged between a flange (30) at the lower end of rod (20) and second compression springs (56) between stationary casing (18) and a moveable casing (48) which is attached to a pneumatic cylinder (40), solenoid, or any other linear actuator. When the actuator is energized, the moveable casing moves down, compressing the second springs until the moveable casing comes into contact with an abutment flange (58) of the spindle. At this point the device continues to move the rod connected to the clamp up to the unclamped position. Since the device is applying an equal downward force, as well as an upward force, there is no force applied to the internal components of the bearings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.