Pull-up latch mechanism

A method of assembling of a pull-up mechanism comprising :

• a stator with a substantially cylindrical inner open channel having a longitudinal axis and extending from a front opening up to a back opening, whereby said inner channel comprises a central portion with a first substantially circular cross section perpendicular to the longitudinal axis and a front portion adjacent to said front opening and having a second substantially circular cross section perpendicular to the longitudinal axis and larger than the said first substantially cross section, the stator being provided with adjacent to its back opening with at least one inner groove system directed towards the inner channel, said inner groove system;
• a cap attached to a cylinder, wherein said cylinder attached to the cap is adapted to be lodged into the open channel of the stator, when the cap is lodged at least partly into the front portion, whereby the cap and cylinder attached to the cap are adapted to rotate with respect to a rotation axis within the substantially cylindrical inner open channel of the stator on the action of a control key, whereby the cylinder attached to the cap is provided with a key slot in which the control key can be engaged, as well as slots with movable tumblers, wherein said tumblers are each movable against the action of at least one spring within their respective tumbler slot from (a) a first position in which a portion of the tumblers extends into a means selected from the group consisting of a groove of the stator and a recess of the stator so as to prevent rotation of the cylinder attached to the cap with respect to the stator, said first position being reached when the control key is not inserted into the key slot of the cylinder attached to the cap, and (b) a second position in which the tumblers are all located completely within their respective tumbler slot of the cylinder attached to the cap, whereby enabling a rotation of the cylinder attached to the cap into the substantially cylindrical inner open channel of the stator, said second position being at least achieved when the control key is inserted within the key slot of the cylinder attached to the cap;
• a shaft provided with a latching pawl, and
• a control system connecting the shaft to the cylinder attached to the cap, said system being adapted:
• for generating for a first movement of rotation of the cylinder attached to the cap a movement of the shaft away from the cylinder attached to the cap in the direction of the longitudinal axis of the substantially cylindrical inner open channel of the stator, and
• for generating for a second movement of rotation of the cylinder a movement of the shaft towards the cylinder attached to the cap in the direction of the longitudinal axis of the substantially cylindrical inner open channel of the stator,
• wherein the said control system comprises a sleeve with a first end turned towards the cylinder attached to the cap and a second end opposite to the said first end, said first end having a slot adapted to cooperate with a retainer tumbler of the cylinder attached to the cap,
• wherein the sleeve has between its first end and second end an outer groove extending in a plane perpendicular to the rotation axis of the cylinder within the substantially cylindrical inner open channel of the stator, wherein the stator is provided with at least one opening for a first rod adapted to have a first portion extending into the said opening of the stator and a second portion extending within the outer groove of the sleeve, said rod acting as retaining means of the sleeve into the substantially cylindrical inner open channel of the stator, while enabling a rotation movement of the sleeve with respect to the stator,
• wherein the sleeve is provided with an inner chamber open at the second end of the sleeve, as well as with a first cam slot and a second cam slot adapted to guide a second rod having:
• a first end portion extending at least in the first cam slot and partly within the first part of the said inner groove system of the stator,
• a second end portion extending at least in the second cam slot and partly within the second part of the said inner groove system of the stator, and
• a central portion extending though a hole of a shaft end portion extending through the second end of the sleeve within the inner chamber thereof,
• wherein the said first cam slot and said second cam slot have at least a substantially helical portion and are adapted to cooperate with the first and second parts of the inner groove system of the stator through the second rod, so as to transform a movement of rotation of the cylinder attached to the cap into a movement of translation of the shaft,
• said method comprising at least the following steps:
• attaching the shaft to the sleeve by inserting the rod through a cam slot of the sleeve, through the hole of the shaft end portion and through the other cam slot of the sleeve;
• inserting the sleeve into the substantially cylindrical inner open channel of the stator, so that the rod attaching the shaft to the sleeve has its end portions located within the inner groove system of the stator;
• inserting the cylinder into the stator channel so that the retainer tumbler of the cylinder has a portion entering within the opening of the first end of the sleeve, so that the cylinder is attached to the sleeve.