МАРШ Уилльям (GB),МОРРИС Энтони Пол (GB),БАТЛЕР Джозеф (GB),ДЖОНС Мэттью (GB),СТИЛ Сэмюэл (GB),ЭВЕРИ Ричард Джеймс Винсент (GB)
申请号：
RU2017115661
公开号：
RU2017115661A
申请日:
2015.10.09
申请国别(地区):
RU
年份:
2018
代理人:
摘要：
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.
