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:
Jul. 31, 2018
Filed:
Mar. 06, 2014
Applicant:
Elekta Ab, Stockholm, SE;
Inventor:
Clifford William Perkins, Crawley, GB;
Assignee:
ELEKTA AB, Stockholm, SE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G21K 1/04 (2006.01); F16C 29/06 (2006.01); F16C 29/00 (2006.01);
U.S. Cl.
CPC ...
G21K 1/046 (2013.01); F16C 29/06 (2013.01); F16C 29/008 (2013.01); Y10T 74/19181 (2015.01);
Abstract
The leaves of a multi-leaf collimator can be driven more easily and hence more quickly if they are supported on a ball-race instead of in a sliding groove. A recirculating path is preferred, in which the rolling elements of the ball-race support the leaf over part of their path and then return to a start of the path. In addition, the rolling elements could be driven by a drive screw in order to drive the leaf.