Abstract: For easy washing and sterilizing of a holding tray for drill bits used in a dental implant operation, a holding tray X includes a tray main body 1 made of a hard material capable of autoclave sterilizing and holding members 2 made of an elastic material capable of autoclave sterilizing, the tray main body 1 includes holding plates 1b and holding member supporting plates 1c on a back surface of a substrate part 1a having rows of linearly aligned through holes 1aa for drill bits, the holding plates 1b include half circular cylindrical recessed parts 1ba at portions corresponding to the through holes 1aa, the supporting plates 1c have a fixed interval to a plane 1bb along the recessed part 1ba, and the holding members 2 are detachably held between the holding plates 1b and the supporting plates 1c to hold the drill bits together with the recessed parts 1ba.

Abstract: For certainly handling a screw member, a screw member 1 includes a male screw 2, and an inner peripheral face of the hole 4 has an engaging recessed part 5 to be engaged with an engaging projected part 11 of a tapered engaging part 10 of a rotary tool 9, and a stepped part 6, said inner peripheral face is parallel or make close to a center axis 7 of the screw member 1 from the head part 3 in a direction of the male screw and from the stepped part 6 in the direction of the male screw, and head part side end edge 8a and an end edge of the stepped part 8b to be engaged with the engaging projected part 11 have an angle of said inner peripheral face being 90±5 degrees with respect to the head part 3 and the stepped part 6.

Abstract: A rod constituting a suspending rod is automatically connected or detached, and a rod is easily conveyed between a position where the rod is delivered to rod attaching/detaching means and a position where the rod is contained. A plurality of jacks are operated in synchronism. In the upper part of a boiler-side steel structure (58) is provided a boiler jack (60) for moving a boiler module (56) up and down via a suspending rod (52). Above the boiler jack is provided a device (68) for automatically attaching/detaching a rod. The device (68) is movable horizontally. The rod attaching/detaching device (68) grips a rod (52S) at the end of the suspending rod pushed up by the boiler jack, rotates it to remove, and transfer it to a rod conveyor device (70). Upon receiving the rod from the rod attaching/detaching device, the rod conveyor device conveys it ro a rod container (54) provided on a working floor (42).