Dental handpiece with removable handpiece sleeve

Claim 1

A dental handpiece including a removable handpiece sleeve for dental implements which are releasably insertable therein through the intermediary of a collet which is rotatable by a drive shaft, said collet being conically tapered on the exterior thereof at an end facing towards a retained dental implement and cooperating with a conformingly conically tapered end of a spindle sleeve; a spring effectuating contact between said conically-tapered ends facing the implement, said spring being inserted between an annular shoulder on the spindle and a clamping sleeve, said collet being releasable by imparting a turning movement to the handpiece sleeve; a rotatable pressure sleeve in said handpiece sleeve contacting said clamping sleeve, said pressure sleeve having two inclined rolling surfaces thereon, at least one pressure roller cooperating with said rolling surfaces such that upon rotation of the handpiece sleeve and of the at least one pressure roller the pressure sleeve axially displaces responsive tot he pressure of the spring such that the pressure of the spring is reduced to enable releasing the connection between the conical ends of the collet and of the spindle sleeve towards the dental implement.