Device for retracting aircraft landing gear

An aircraft undercarriage comprising:

• a strut designed to be mounted in a hinged manner to a structure of the aircraft, and
• a bottom portion carrying wheels of the aircraft and being movable relative to the strut, the bottom portion comprising a slide rod mounted to slide in the strut and a scissors linkage extending between the strut and the slide rod,
• the undercarriage also including an undercarriage shortener device for shortening the undercarriage between a deployed position and a raised position by causing the slide rod to enter into the strut,
• wherein said shortener device comprises first and second members coupled to each other, the first member being coupled to the bottom portion of the undercarriage or to an element that moves together with said bottom portion during movement of said bottom portion relative to the strut, while the second member being hinged to the structure of the aircraft in such a manner that while the undercarriage is being raised, the second member comes into abutment before the undercarriage reaches the raised position, and
• wherein, the first member is coupled to the scissors linkage.