Abstract: The invention discloses a fast and reliable coupling device between a tool shank and a motor assembly of a hand-held blender, which can be released by the user. The motor assembly is of the type that has a cylindrical nozzle centrally positioned on the base by which it couples to the tool shank, the outer side of which has a threaded portion, whilst the tool shank has an internally threaded nut that is complementary to the nozzle, the base of the motor assembly also including a formation that projects outwards, with a hole through which a retaining ball projects, pushed by a spring, whilst radial partitions project from the outer wall of the coupling nut of the tool shank towards the inner face of the coupling bell, one of these partitions having on its upper edge a cup-shaped formation that is of suitable dimensions to admit and house said ball when aligned with it during the coupling operation between said tool shank and motor assembly.

Abstract: The invention discloses an arrangement specially designed for the releasable coupling of a tool shank and a motor assembly of the type used in hand-held blenders. The motor assembly has a cylindrical nozzle that projects from the distal base thereof, inside which the output shaft of the motor is housed, on the outer side of which it has a threaded formation to quickly screw it onto the tool shank. The coupling arrangement has a secure means of retention of the tool shank in the position in which it is coupled to the motor assembly, this means consisting of a click-in piece that secures the distal base of the motor assembly and substantially projects from the plane of said base, together with the formation of multiple partitions formed inside the bell on the coupling end of the tool shank, these partitions extending radially and angularly equally-spaced to define cavities designed to receive and retain the click-in piece during the coupling operation of the tool shank and the motor assembly.