Patent ID: 8138869

Claim:
An accessory unit, comprising: an accessory body; and a magnetic assembly pivotally connected to the accessory body, comprising: a first plurality of magnetic elements arranged adjacent one another in a first relative size order along a first line and arranged according to a first polarity pattern of magnetic polarities, and a second plurality of magnetic elements arranged adjacent to one another in a second relative size order along the first line and according to a second polarity pattern of magnetic polarities, wherein the magnetic assembly is arranged to magnetically attach the accessory unit to a first part of a host unit with a peak magnetic force, a housing having a front opening, a first end lug pivotally connected to an end of the housing, a second end lug pivotally connected to an opposite end of the housing, wherein the first and second end lugs and the housing pivot about a first pivot line, a rigid connecting rod connecting the first and second end lugs, a sleeve sized to accommodate the rigid connecting rod, the sleeve and rigid connecting rod inserted into an opening in the accessory body, the rigid connecting rod forming a second pivot line different than the first pivot line about which the first and second end lugs and housing pivot, and a magnetic shunt enclosed in the housing and attached to a back portion of the first and the second plurality of magnetic elements, the magnetic shunt arranged to re-direct at least some magnetic field lines away from the back side of the housing and towards the front opening thereby increasing a magnetic flux density between the first and second plurality of magnetic elements and a corresponding magnetic element in the host unit.