Abstract: A cam mounting gear having a number of teeth smaller by one than the number of teeth of a main gear which is driven to rotate is disposed in parallel to the main gear, and a cam having a tapered face formed thereon such that the thickness thereof gradually increases along an inner periphery thereof is disposed on an inner wall of the cam mounting gear. A main holder having a cutter blade and a bearing which contacts with the cam is supported for rotation on a flat face portion of the main gear. As rotation of the main gear is transmitted to the cam mounting gear via a pinion, the bearing of the main holder is driven to roll on the tapered face of the cam, and thereupon, the cutter blade is displaced in a direction toward the center of the apparatus to cut a cutting object pipe located at a central location of the apparatus.

Abstract: A valve open/closed condition indication apparatus includes a handle base mounted at an upper portion of a bonnet of a valve and having a spiral guide formed on an upper face thereof, and a handle including a handle body disposed on the handle base and an open/closed condition indication plate disposed on the handle body and engaged with and slidably movable in a diametrical direction by the spiral guide of the handle base. When the handle is rotated, a projection of the open/closed condition indication plate of the handle is guided by the spiral guide formed on the handle base so that it is moved in a diametrical direction. When the valve is put into a fully open condition or a fully closed condition by the rotation of the handle, a symbol or color indication marked on the open/close condition indication plate or the handle body and representing the fully open condition or the fully closed condition is indicated accurately in an indication window formed in a name plate or some other suitable member.