Force transmission arrangement for auto-injector
First Claim
1. Transmission arrangement for controlling a force of a translation of a plunger of an injection device, the transmission arrangement comprising a drive collar connected to a translative drive means and prevented from rotating with respect to a ground of the drive means, a flange face of the drive collar bearing against a mating flange face of a friction collar, the friction collar slidable in longitudinal direction and rotationally constrained by engagement in a cam track comprising at least one section having a non-zero pitch angle, another flange face of the friction collar bearing against a mating flange face of a plunger, the plunger slidable in longitudinal direction and prevented from rotating.
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Accused Products
Abstract
The invention relates to a transmission arrangement for controlling a force of a translation, the transmission arrangement comprising a drive collar (13) connectable to a translative drive means (11) and prevented from rotating with respect to a ground (12) of the drive means (11), a flange face of the drive collar (13) bearing against a mating flange face of a friction collar (20), the friction collar (20) slidable in longitudinal direction and rotationally constrained by engagement in a cam track (12.3), another flange face of the friction collar (20) bearing against a mating flange face of a plunger (8), the plunger (8) slidable in longitudinal direction and prevented from rotating.
36 Citations
15 Claims
- 1. Transmission arrangement for controlling a force of a translation of a plunger of an injection device, the transmission arrangement comprising a drive collar connected to a translative drive means and prevented from rotating with respect to a ground of the drive means, a flange face of the drive collar bearing against a mating flange face of a friction collar, the friction collar slidable in longitudinal direction and rotationally constrained by engagement in a cam track comprising at least one section having a non-zero pitch angle, another flange face of the friction collar bearing against a mating flange face of a plunger, the plunger slidable in longitudinal direction and prevented from rotating.
Specification