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. 01, 2019
Filed:
Oct. 09, 2015
Sanofi, Paris, FR;
William Marsh, Buckinghamshire, GB;
Anthony Paul Morris, Coventry, GB;
Joseph Butler, Rugby, GB;
Matthew Jones, Warwick, GB;
Samuel Steel, Warwickshire, GB;
Richard James Vincent Avery, Gloucestershire, GB;
Sanofi, Paris, FR;
Abstract
The present disclosure relates to a drive mechanism which is suitable for an injection device, especially a pen type drug delivery device and to such a drug delivery device. The mechanism comprises a spring driven rotatable drive member, a rotatable driven member, a clutch rotationally coupling the driven member and the drive member in a coupled state and allowing relative clockwise and anti-clockwise rotation between the driven member and the drive member in a decoupled state, and a spring biasing the clutch into its coupled state and allowing relative axial movement between the drive member and the driven member into the decoupled state of the clutch against the bias of the spring. The clutch comprises a first ring of crown teeth on the drive member and a second ring of corresponding crown teeth on the driven member with each crown tooth having in the clockwise and the anti-clockwise direction different ramped tooth angles such that the teeth are allowed to override each other in the de-coupled state of the clutch with a different resistance in the clockwise and the anti-clockwise direction.