Asymmetric drag force bearings for use with push-cable storage drums
US8908027B2 · kind B2 · utility
10Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2011 |
| Grant date | Dec 9, 2014 |
| Priority date | — |
| Expiry date | Aug 6, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/183
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pipe inspection system may include a cable storage drum and a length of resilient flexible push-cable. An asymmetric bearing device supports the cable storage drum for rotation about the rotational axis in a pay-out direction and an opposite pay-in direction. In one embodiment, the asymmetric bearing device automatically decreases, without the for manual adjustment, an amount of friction exerted against rotation of the cable storage drum upon reversal of the direction of rotation of the cable storage drum from the pay-out direction to the pay-in direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.