Device for driving a rotary tool for a food processing appliance and food processing appliance provided with such a driving device

摘要

This device comprises a driving shaft, which is rotary on itself around a central axis and which is secured to a head for driving the tool into rotation around the axis, the tool being added onto the driving head in a removable way. The driving head includes a driving hub which is adapted so as to be engaged with a driven hub of the tool in order to transmit a rotary movement between them. The driving head is provided with locking centrifugal weights for the tool on the driving head, said centrifugal weights being moveable, under the effect of a centrifugal force resulting from the setting into rotation of the driving head by the driving shaft, between a rest position, in which the centrifugal weights do not interfere with the driven hub, and a position of use, in which a portion of each of the centrifugal weights is brought closer to the central axis and mechanically cooperates with the driven hub in order to maintain it engaged with the driving hub.

主权项

1. A device for driving into rotation a rotary tool for a food processing appliance, this device comprises a driving shaft, which is rotatable around a central axis and which is secured to a driving head for driving a tool into rotation around the central axis, the tool being added onto the driving head in a removable way,
wherein the driving head includes a driving hub which is adapted to be engaged with a driven hub of the tool for transmitting a rotary movement around the central axis from the driving hub to the driven hub, wherein the driving head is provided with locking centrifugal weights for locking the tool on the driving head, which locking centrifugal weights are moveable, under the effect of a centrifugal force resulting from rotating the driving head around the central axis by the driving shaft, between a rest position, in which the locking centrifugal weights do not interfere with the driven hub and a position of use, in which a portion of each of the locking centrifugal weights is brought closer to the central axis and mechanically cooperates with the driven hub for maintaining the driven hub engaged with the driving hub, wherein the driving hub and the driven hub respectively include driving branches and driven branches, which each extend in a substantially parallel way to the central axis and which are positioned in a substantially regular way around the central axis while being pairwise separated by a driving niche and a driven niche respectively, the driving branches being received in the driven niches and the driven branches being received in the driving niches when the driving and driven hubs are engaged with each other, and wherein each of the driven branches has, at a free axial end thereof, edges which are opposite to each other along a peripheral direction to the central axis and which, under the effect of the locking centrifugal weights in their position of use, are supported on walls formed in the bottom of the driving niche receiving the driven branch, by forming supporting components both parallel and orthogonal to the central axis.