Apparatus for servicing a reactor such as tensioning reactor vessel head studs
US5730421A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1995 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A stud tensioner for tensioning the upright studs which secure the head to a reactor pressure vessel is suspended by a motor operated hoist from a motor operated trolley mounted on a circular rail supported above the studs. A single operator operates the motor operated hoist and motor operated trolley, and manually radially fine aligns the stud tensioner for engagement with a stud through a control handlebar. A pair of side-by-side switches adjacent a first hand grip at one end of the handlebar enable the operator to operate the trolley to move the stud tensioner left or right, while vertically aligned switches adjacent a second hand grip at the other end of the handlebar are used to operate the hoist to raise and lower the stud tensioner. Simultaneously, the operator can radially maneuver the stud tensioner by applying force through the handlebar. An adjustable mount allows the handlebar to be rotated about a horizontal pivot axis and locked into a selected angular position relative to the tensioner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.