The invention relates to an instrument (12) which comprises: a tool (24) a tool-holder (26) complementary means (30) for vibrational coupling of the tool (24) to the tool-holder (26) which can be activated by relative movement of the tool (24) and the tool-holder (26) along a vibrational coupling/uncoupling stroke and complementary releasable means (28) for attaching the tool (24) to the tool-holder (26) allowing, when the tool (24) is attached to the tool-holder (26), the vibrational coupling/uncoupling stroke. The attachment means (28) include two attachment members, male (36) and female (38), which can be attached together by relative movement along an attachment/detachment stroke. Said attachment members (36, 38) cannot be deformed during the attachment/detachment stroke. Said stroke includes an axial component and a component in a plane substantially transverse to the axial component, referred to as the transverse component. The axial and transverse components of the attachment/detachment stroke are defined by complementary interlocking shapes (36F, 38F) provided on the two connection members (36, 38).本器具(12)包括:- 工具(24),- 工具夾持具(26),- 工具(24)對工具夾持具(26)之互補振動耦合手段(30),可藉由工具(24)與工具夾持具(26)沿振動耦合-解耦動程之相對位移致動,- 工具(24)對工具夾持具(26)之可鬆脫互補連接手段(28),當該工具(24)連接至該工具夾持具(26)時,容許振動耦合-解耦動程。連接手段(28)包括陽(36)與陰(38)兩個耦合構件,可藉由沿連接-脫開動程之相對位移,於其間連接。此等連接構件(36,38)在連接-脫開動程中不變形。該動程包含軸向分量,以及在實質上橫切此軸向分量之平面中之分量,亦即橫向分量。此等連接-脫開動程之軸向與橫向分量由設於兩個連接構件(36,38)上之互補接合形狀(36F,38F)界定。24‧‧‧工具24P‧‧‧近端26‧‧‧工具夾持具26D‧‧‧遠端28‧‧‧可鬆脫互補連接手段30‧‧‧振動耦合互補手段32‧‧‧振動耦合互補表面34‧‧‧振動耦合互補表面36‧‧‧陽連接構件36F‧‧‧互補螺紋38‧‧‧陰連接構件(滑動件)38F‧‧‧互補螺紋40‧‧‧凹穴42‧‧‧筒體44‧‧‧互補定心表面46‧‧‧互補定心表面47‧‧‧膛孔48‧‧‧第一止動件50‧‧‧第二止動件52‧‧‧通道54‧‧‧溝槽
