Patent ID: 8021152

Claim:
A dental handpiece comprising: a grip section having a head section in which a treatment tool is detachably attached, and a drive section detachably connected to the grip section, said grip section further comprising: a casing having a front casing portion and a rear casing portion, said front casing portion being slanted at an obtuse angle with respect to said rear casing portion and the casing being continuous, a first rotary shaft rotatably supported in the rear casing portion, a cylindrical jacket extending from the head section, and arranged and fixed in the front casing portion toward said first rotary shaft, said jacket being provided with an engagement groove on its circumferential surface, and a second rotary shaft rotatably supported in said jacket, and operatively connected to the treatment tool at one end and to said first rotary shaft at the other end via a gear, wherein driving force from said drive section is transmitted by said first and second rotary shafts to the head section to drive the treatment tool, wherein said grip section further comprises engaging means disposed in the rear casing portion and comprising an engagement rod, said engagement rod disposed generally in parallel with the first rotary shaft, displaceable toward the front casing portion, and detachably engaging said engagement groove on the jacket, wherein said jacket arranged in the front casing portion is fixed therein by engagement of said engagement rod in said engagement groove on the jacket.