Patent ID: 8837761
Filing Date: 2014-09-16
Classification: H04R

Abstract:
1. Vibrator, comprising: a spring having a first end and a second end, a frame immovably attached to the second end, the frame carrying a movable armature and at the first end of the spring a coupling with an armature plate is immovably attached, whereby the armature plate and the movable armature are provided in close proximity with an air gap there between, a permanent magnet associated with one or both of the armature plate and/or the movable armature, an electrical coil associated with one or both of the armature plate and/or the movable armature, an adjustment screw provided to displace the movable armature towards or away from the armature plate, wherein the screw is inserted in a bore, wherein the bore has a length axis placed along a plane of intersection between the movable armature and the frame wherein one part of the bore is provided in the movable armature and an opposed part of the bore is provided in the frame, and one part of the bore is threaded and the opposed part is unthreaded.