The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1990
Filed:
Feb. 10, 1989
Gerard Chevereau, Le Raincy, FR;
Framatome, Courbevoie, FR;
Abstract
A drive mechanism for a neutron absorbing bar of a liquid cooled nuclear reactor has a drive shaft movable within upper internals and a shock absorber. The shock absorber has a hydraulic cylinder arranged to bear on the upper internals, formed with a bore comprising an upper portion of larger diameter provided with discharge holes spaced longitudinally along the bore and with a lower portion of smaller diameter, a piston, movable within and along the cylinder, having a diameter corresponding to that of the upper portion and defining a shock absorbing chamber with the upper portion, the chamber having exhaust means comprising the discharge holes located to be progressively covered by the piston during downward movement thereof within the cylinder, and a resetting spring biasing the piston towards a top position where it uncovers the discharge holes. The shaft passes through the piston and is arranged for forcing the piston down into the cylinder upon downward movement of the shaft in the upper internals beyond a predetermined level.