Air shaft
US4254920A · kind A · utility
12Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1978 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Jun 19, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H75/243
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An expansible shaft including a hollow axially-extending body and operatively coupled core engaging and retracting sections within the body. The core engaging section includes a core engager movable relative to the body in a direction generally perpendicular to the axis of the body and biased towards a core engagement position in which it projects beyond the wall of the body; and the retracting section includes an actuator arranged to overcome the bias and move the core engager radially inwardly from its core engagement position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.