Patent ID: 7407375

Claim:
Arrangement for the removable attachment of a stretching rod ( 22 ) on a movable slide ( 16 ) belonging to a machine ( 10 ) for stretch-blow moulding a preform for the manufacture of receptacles, of the type in which the slide ( 16 ) is mounted so as to slide relative to a support ( 12 ) along a substantially vertical axis (A 1 ) above the opening of the preform, of the type in which the stretching rod ( 22 ) is attached to the slide ( 16 ) by means of an attachment device ( 20 ) comprising: a casing ( 24 ) that is attached to the slide ( 16 ), that is furnished with a top transverse partition ( 28 ) and a bottom transverse partition ( 30 ) axially delimiting an internal housing ( 34 ), each partition ( 28 , 30 ) comprising an axial opening ( 36 , 38 ) allowing an associated section of the stretching rod ( 22 ) to pass through, a bearing element ( 42 ) that comprises several circumferential portions ( 52 , 54 ) radially clamped onto a section ( 56 ) of the stretching rod ( 22 ), that is designed to be inserted axially inside the housing ( 34 ) of the casing ( 24 ) while passing through the top axial opening ( 36 ) of the casing ( 24 ), and that comprises a top transverse surface ( 44 ) designed to come to bear axially against a portion of the bottom inner face ( 46 ) of the top transverse partition ( 28 ) of the casing ( 24 ) during the stretching step, and a bottom transverse surface ( 48 ) designed to come to bear axially against a portion of the top inner face ( 50 ) of the bottom transverse partition ( 30 ) of the casing ( 24 ) in order to hold the rod ( 22 ) axially down in the casing ( 24 ), so that the stretching rod ( 24 ) can be attached to the slide ( 16 ) by a mount of the bayonet type, the rod ( 22 ) being inserted axially, with the bearing element ( 42 ), in the casing ( 24 ), and the rod ( 22 ) being pivoted about its axis (A 1 ), from an angular insertion position to an angular mounted position, to place a portion of the top transverse surface ( 44 ) of the bearing element ( 42 ) facing the associated inner face ( 46 ) of the casing ( 24 ) characterized in that the top end section ( 62 ) of the bearing element ( 42 ) is formed by at least two radial lugs ( 64 ) of rounded profile, in transverse section, the top transverse bearing surface ( 44 ) being formed by the top transverse face of the lugs ( 64 ), and in that the transverse profile formed by the peripheral edge ( 65 ) of the top opening ( 36 ) of the casing ( 24 ) substantially matches the profile of the lugs ( 64 ).