Folding head restraint mechanism

A mechanism for folding a head restraint for a backrest of a seat, the mechanism comprising a head restraint and a cross portion,

• wherein the cross portion is fixed relative to the backrest,
• wherein the cross portion defines a first pivot axis, which the head restraint is pivoted about,
• wherein the cross portion comprises a locking disc,
• wherein the head restraint comprises a cam,
• wherein the cam is pivoted about a second pivot axis,
• wherein the head restraint is configured to be positioned in a usage-position relative to the cross portion and a storage-position relative to the cross portion,
• wherein a position of the head restraint is changeable between the usage-position and the storage-position by pivoting about the first pivot axis,
• wherein the cam is configured to be positioned in a locking-position relative to the head restraint and a releasing-position relative to the head restraint,
• wherein, when the cam acquires the locking-position and the head restraint acquires the usage-position, a first bearing surface, being a bearing surface of the cam, bears against and/or faces a second bearing surface, being a bearing surface of the locking disc,
• wherein the head restraint is locked in the usage-position when the head restraint acquires the usage-position and the cam acquires the locking-position,
• wherein the head restraint is unlocked with respect to pivoting about the first pivot axis when the cam is in the releasing-position,
• wherein at least the cam and the locking disc are at least partly accommodated in at least one housing bracket,
• wherein the at least one housing bracket accommodates a locking pin, where one end of the locking pin is rigidly connected thereto, and the locking pin at least partially protrudes from the at least one housing bracket,
• wherein an opposing end of the locking pin is rigidly connected to another housing bracket,
• wherein at least the cam and the locking disc are at least partly accommodated in two or more of the housing brackets, and
• wherein, when the head restraint acquires the storage-position, the locking pin bears against the second bearing surface.