Abstract: A ring-blade saw for cutting a tube generally centered on a tube axis has a subtantially stationary base, an outer frame displaceable in a straight line in a plane, and an actuator connected between the base and the outer frame for displacing the frame relative to the base in the plane. An inner support is carried by a first guide on the frame for movement relative to the frame in a first straight direction lying in the plane and by a second guide for movement of the support relative to the frame in a second straight direction lying in the plane and perpendicular to the first direction. A generally planar, annular and internally toothed saw blade lying generally on the plane, centered on a saw axis generally perpendicular to the plane, and carried on the support can be rotated on the support about this saw axis. Thus the tube to be cut can extend through the blade with its axis parallel to or on the blade axis.

Abstract: Disclosed is a shield for sprinklers, which can be quickly attached and detached from a sprinkler standpipe. The shield has a semi-circular deflector mounted at the top of a support rod. A hook is formed in the bottom of the support rod to engage the standpipe. The hook is disposed in a plane substantially horizontal to the support rod, has a slightly helical configuration, and opens in laterally with respect to said rod. Midway of said rod a brace projects from said rod substantially normal thereto and has a standpipe engaging fork in its outer end. The hook readily engages the standpipe when the support rod is parallel to the standpipe and clamps to it when the upper end of the support rod is drawn away from the standpipe to engage the brace with the standpipe.