Abstract: There is provided a water treatment pad for a drilling tool capable of being fixed quickly and firmly. The present invention provides a water treatment pad for a drilling tool, which is installed on a drilling surface of an object to be drilled when a hole is drilled in the object by using the rotating drill tool while machining water is supplied. The water treatment pad includes a substantially cylindrical pad body having a drain in the side surface thereof and mounted in a manner that surrounds the drilling tool, and a cylindrical diffuser ring detachably fixed in the pad body in a manner that surrounds the drilling tool to accelerate a fluid therein and release the fluid to the outside. On the end surface of the diffuser ring which comes into contact with the drilling surface, convex-shaped blades the transverse cross section of which has an airfoil profile tilting in the rotative direction of the drilling tool are arranged in an aligned manner.

Abstract: A water treatment pad for core drill, attached on a drilling surface in performing drilling work while supplying cutting water with a core drill, wherein the water treatment pad for core drill comprises: a roughly cylindrical pad main body 10 mounted to surround the core drill and having a drain outlet on a side surface; an inner wall plate 20a detachably attached on the inside of the pad main body and formed into an arc shape in cross section when attached and wherein a pressure space communicating with the drain outlet is formed between the inner wall plate and an inner surface of the pad main body. As an attachment structure of the inner wall plate 20a, preferably, the guide 12 formed with a fitting groove 13 in the top rear face of the pad main body 10 is provided on a circumference thereof so that the inner wall plate 20a is fitted.

Abstract: There is provided a water treatment pad for a drilling tool capable of being fixed quickly and firmly. The present invention provides a water treatment pad for a drilling tool, which is installed on a drilling surface of an object to be drilled when a hole is drilled in the object by using the rotating drill tool while machining water is supplied. The water treatment pad includes a substantially cylindrical pad body having a drain in the side surface thereof and mounted in a manner that surrounds the drilling tool, and a cylindrical diffuser ring detachably fixed in the pad body in a manner that surrounds the drilling tool to accelerate a fluid therein and release the fluid to the outside. On the end surface of the diffuser ring which comes into contact with the drilling surface, convex-shaped blades the transverse cross section of which has an airfoil profile tilting in the rotative direction of the drilling tool are arranged in an aligned manner.

Abstract: A water treatment pad for core drill, attached on a drilling surface in performing drilling work while supplying cutting water with a core drill, wherein the water treatment pad for core drill comprises: a roughly cylindrical pad main body 10 mounted to surround the core drill and having a drain outlet on a side surface; an inner wall plate 20a detachably attached on the inside of the pad main body and formed into an arc shape in cross section when attached and wherein a pressure space communicating with the drain outlet is formed between the inner wall plate and an inner surface of the pad main body. As an attachment structure of the inner wall plate 20a, preferably, the guide 12 formed with a fitting groove 13 in the top rear face of the pad main body 10 is provided on a circumference thereof so that the inner wall plate 20a is fitted.

Abstract: In an apparatus for closing a fireproof door, a holding device comprises a latch mechanism and a slider. The latch mechanism comprises an actuator member swingably supported in a housing which is provided with a tubular portion wherein a stopper is inserted and downwardly biased by a spring, the biasing force of the spring being adjustable by a screw which is threaded into the tubular portion. The slider is provided with an inclined surface at the front end thereof and a through-hole to receive the stopper therein. The slider is slid into the spacing formed between the actuator member and the housing with upwardly guiding the stopper by the inclined surface of the slider and the slider is locked by the stopper when it falls into the through-hole of the slider. The slider is released from the latch mechanism by swinging the actuator member or upwardly pushing the stopper against the biasing force of the spring.

Abstract: In an apparatus for closing a fireproof door in case of emergency, the fireproof door and a release, which is secured to a door frame, are interconnected by a link mechanism comprising first, second and supplemental link arms. One end of the first link arms is pivoted to a driving shaft of a door closer secured to the fireproof door. The other end of the first link arm is pivoted to one end of the second link arm, the other end of which is pivoted to the release. The supplemental link arm is connected between the central point of the second link arm and a slider which is slidably mounted inside the release and latched by a latch mechanism when the fireproof door is open.When the slider is released from the latch mechanism by electrizing a solenoid which operates the latch mechanism, the slider is slid inside the release by the closing force of the door closer transmitted via the link mechanism, thereby closing the fireproof door.