Guide rail assembly and driving element for motor vehicle window lifters and method for the production thereof

A method for the production of a guide rail assembly by means of injection moulding from a plastic material, for motor vehicle window lifters, which is formed of a plastic material, said guide rail assembly comprising a flat carrier and at least one guide rail for guidance of a window lifter driving element, wherein the guide rail has two guide webs spaced apart from each other and protruding from the carrier and wherein guide protrusions are formed on the guide webs, each of said guide protrusions extending over the entire guidance length of the guide webs and each of said guide protrusions protruding by a predetermined distance inwards or outwards from the respective guide web such that the driving element cooperating with the guide webs is securely guided against detachment perpendicular to the carrier, said method comprising the steps of:

• providing a moulding tool having at least three movable moulding tool parts, which together form a first cavity for formation of the flat carrier and two second cavities for formation of the guide webs and guide protrusions;
• injection moulding of the guide rail assembly from the plastic material within the moulding tool;
• and removing the guide rail assembly from the moulding tool;
• during which process one moulding tool part defining the interior of the guide rail is wedge-shaped and is disposed between two adjacent moulding tool parts and all of the at least three movable moulding tool parts are withdrawn in the same direction on removal.

A method for the assembly of a guide rail assembly for motor vehicle window lifters, comprising a driving element wherein said guide rail assembly is formed of a plastic material and comprises a flat carrier and at least one guide rail for guidance of said driving element, wherein the guide rail has two guide webs spaced apart from each other and protruding from the carrier and wherein guide protrusions are formed on the guide webs, each of said guide protrusions extending over the entire guidance length of the guide webs and each of said guide protrusions protruding by a predetermined distance inwards or outwards from the respective guide web such that the driving element cooperating with the guide webs is securely guided against detachment perpendicular to the carrier, in which guide rail assembly said guide webs are designed such that in the region of said guide protrusions said guide webs are each elastically bendable inwards or outwards by at least the predetermined distance;

• and wherein said driving element is designed to be movably guided in the longitudinal direction of the guide rail of the window lifter and to be secured perpendicular to the longitudinal direction,
• said driving element comprising a body, which has at least one U-shaped longitudinal recess and is made of a first material, and at least one sliding insert formed from a second material that is different from the first material, which is held securely in the relevant longitudinal recess, wherein the sliding insert has a guide groove, which is formed at least in sections correspondingly to a guide web of the guide rail;
• said method comprising the steps of:
• placing of each sliding insert on the associated guide web such that the guide groove formed therein cooperates at least in sections in the manner of a positive fit;
• placing of the body of the driving element on at least one said guide web such that the relevant sliding insert is accommodated in the associated longitudinal recess of the body;
• and
• securing of the relevant sliding insert on the body such that the driving element is movably guided on each guide web in the longitudinal direction thereof and is secured in a direction perpendicular thereto.

A method for the assembly of a guide rail assembly for motor vehicle window lifters comprising a driving element

• wherein said guide rail assembly is formed of a plastic material and comprises a flat carrier and at least one guide rail for guidance of said driving element, wherein
• the guide rail has two guide webs spaced apart from each other and protruding from the carrier and wherein
• guide protrusions are formed on the guide webs,
• each of said guide protrusions extending over the entire guidance length of the guide webs and
• each of said guide protrusions protruding by a predetermined distance inwards or outwards from the respective guide web such that the driving element cooperating with the guide webs is securely guided against detachment perpendicular to the carrier,
• in which guide rail assembly said guide webs are designed such that in the region of said guide protrusions said guide webs are each elastically bendable inwards or outwards by at least the predetermined distance;
• and wherein said driving element is designed to be movably guided in the longitudinal direction of the guide rail of the window lifter and to be secured perpendicular to the longitudinal direction,
• said driving element comprising a body, which has at least one U-shaped longitudinal recess and is made of a first material, and at least one sliding insert formed from a second material that is different from the first material, which is held securely in the relevant longitudinal recess, wherein the sliding insert has a guide groove, which is formed at least in sections correspondingly to a guide web of the guide rail;
• said method comprising the steps of:
• inserting the respective sliding insert in the associated U-shaped longitudinal recess of the driving element in order to form a pre-assembled driving element unit consisting of the driving element and of at least one sliding insert;
• placing the pre-assembled driving element unit on the associated guide webs in such a manner that the driving element is movably guided on the respective guide web in the longitudinal direction thereof and is secured in a direction perpendicular thereto;
• and
• sliding the driving element into a region, in which the locking web of the carrier engages in the longitudinal recess of the driving element in such a manner as to counteract at least one of bending of surfaces of the driving element forming the longitudinal recess and popping of the at least one sliding insert out of the associated U-shaped longitudinal recess on detachment of the driving element perpendicular to a plane defined by the carrier.