| 摘要 |
1. An adapter or collet for tap holders consisting of a mounting body (1) in a movable part of the holder, of a bush (2) with balls for retaining the tap (3) loaded by a spring (4) and of a driving square (5) for the tap (3), this adapter or collet being equipped with a variable torque limiting device (6) consisting of a first part (7) in the form of a thick disc, mounted for free rotation on the mounting body (1), provided, on one face, at regular intervals, with first recesses (8), extending radially, for rolling elements (11), and which is equipped, at the opposite side to said first recesses (8), with two driving tenons (9) cooperating with the transverse groove in the movable part of the holder, of a second part (10) in the form of a thick disc, this second part (10) being mounted with the possibility of sliding on the body (1) against the action of a stack of Belleville washers (15), housed in a cover (16) rigidly connected to one end of the first part (7), and of a nut (17) for regulating the pressure of the washers (15) closing the cover (16) at its free end, and capable of being locked by means of one or more radial screws (18), characterised in that the rolling elements (11) are in the form of first cylindrical rollers, and in that the second part is equipped with second recesses (11') housing the first cylindrical rollers (11) at regular intervals, extending radially and adapted to co-operate with the recesses (8) in the first part in the form of a disc (7), and is equipped with two other diametrically opposite recesses (12), extending axially, and adapted to co-operate with second cylindrical rollers (13), for driving the body (1) in rotation, housed in corresponding longitudinal grooves (14) in said body (1).
|
