Abstract: There is provided a click device adapted to define a position by fitting a clicking projection in desired one of clicking grooves provided at a predetermined pitch. For defining the position with a unit less than a pitch of the clicking grooves, there are provided plural clicking projections, which are provided in respectively different positions within a pitch (or N pitches, wherein N is zero or a natural number) of the clicking grooves.

Abstract: A vibratory compaction working machine has a lower travel structure and an upper swing structure mounted on the lower travel structure. The upper swing structure has a boom mounted thereon for pivotal movement by a first hydraulic cylinder, an arm mounted on the boom at its forward end for pivotal movement by a second hydraulic cylinder, and vibratory plate compactor mounted on the arm at its forward end for pivotal movement by a third hydraulic cylinder. The arm is in the form of an extension arm having a first arm element and a second arm element mounted for linear movement relative to the first arm element by a fourth hydraulic cylinder. The first arm element is attached at the forward end of the boom for pivotal movement by the second hydraulic cylinder, and the second arm element has the vibratory plate compactor attached to the forward end thereof for pivotal movement by the third hydraulic cylinder.

Abstract: A rotatable cutter head for a pit boring machine used in reverse circulation drilling. The cutter head has cutter arrays including rotary cutters and drag cutters and disposed radially and circumferentially spaced positions on the cutter head, the drag cutters having the cutting ends lying generally in a conical plane having the axis coaxial with the axis of rotation of the cutter head. The rotary cutters each have cutting teeth around the circumference thereof and each tooth has an inclined side face lying in a further conical plane the central axis of which is coaxial with the axis of rotation of the rotary cutter, the inclined side face of each tooth facing generally along the inclination of the conical plane in which the cutting ends of the drag cutters lie, and the tip of each cutting tooth of each rotary cutter projecting beyond the plane in which the cutting ends of the drag cutters lie.

Abstract: A treating facility for treating sintering waste gas comprises a first electric dust collector receiving the waste gas and a main blower connected to the first dust collector for moving the waste gas through the first dust collector. A heat exchanger is coupled to receive the waste gas from the blower. A waste gas purifying device is coupled to the heat exchanger for purifying the waste gas discharged from the first dust collector. A second wet electric dust collector is coupled to receive the waste gas from the purifying device and a pressure riser is coupled to the second dust collector for raising the pressure of the output gas of the second dust collector. The output gas from the pressure riser is returned to the heat exchanger and after heat exchange with the gas discharged from the blower is exhausted to atmosphere.