Abstract: A two-hole core drilling machine of the invention includes a body, a vertically reciprocating carriage vertically reciprocably mounted to the body, a fixing plate coupled to one side surface of the carriage, to rotatably support a drive shaft of a motor, a pivoting plate fastened to the fixing plate under a condition that a pivot angle of the pivoting plate is changed, a moving plate fastened to the pivoting plate under a condition that a length of the moving plate from the pivoting plate is varied, a belt or chain mounted between a drive pulley coupled to the drive shaft and a driven pulley coupled to a driven shaft rotatably mounted to the moving plate, a first core bit coupled to the drive shaft, and a second core bit coupled to the driven shaft.

Abstract: A four-hole core drilling machine of the invention includes a vertically reciprocating carriage mounted to a body, a motor coupled to the carriage, a fixing plate coupled to the carriage, to rotatably support a drive shaft of the motor, a pivoting plate fastened to the fixing plate under the condition that a pivot angle of the pivoting plate is changed, a drive pulley coupled to the drive shaft, to be rotatable by the drive shaft, four driven pulleys rotatably mounted to the pivoting plate near corners of the pivoting plate, four driven shafts rotatably mounted to the pivoting plate and coupled to the four driven pulleys, to be rotatable by the driven pulleys, a belt mounted around the drive pulley and the driven pulleys, to transmit rotation force of the drive pulley to the driven pulleys, and four core bits coupled to lower ends of the driven shafts.

Abstract: A floor cutting machine according to the present invention can comprise: a main frame for supporting equipment required for cutting a floor; a plurality of front wheels positioned at the front of the main frame when the proceeding direction of the floor cutting machine is the front and the opposite direction thereof is the rear; at least one rear wheel positioned at the rear of the main frame; a cutting frame which is a frame separate from the main frame, and of which one side is fixed near the rear of the main frame and the other side vertically moves; a cutting shaft positioned near the other side of the cutting frame; and a cutting blade capable of being fitted into both ends of the cutting shaft.

Abstract: A wire saw apparatus comprises: a first pulley system from which a wire is withdrawn toward a structure to be cut; a second pulley system into which the wire is introduced from the structure; a first dust collection pipe unit provided to surround the wire between an end part at which surrounding of the structure by the wire ends and a part at which the wire is introduced into the first pulley system; and a second dust collection pipe unit provided to surround the wire between a start part at which surrounding of the structure by the wire starts and a part at which the wire is withdrawn from the second pulley system.

Abstract: A floor cutting machine having a dust collection cover coupled thereto may comprise a main frame having a first dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine; a plurality of front wheels located at a front of the main frame; at least one rear wheel located at a rear of the main frame; a cutting frame having one side fixed to a vicinity of the rear of the main frame and the other side configured to be moved upwards and downwards; a cutting blade fitted on opposite sides of a cutting shaft located in the vicinity of the other side of the cutting frame; and a front frame detachably connected to the front of the main frame, the front frame having a second dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine.

Abstract: This wire saw machine having a dust collecting apparatus comprises a main roller for moving a wire by rotation; a first pulley system including a first upper dust collecting roller, a first lower dust collecting roller, and a first support roller; a second pulley system including a second upper dust collecting roller, a second lower dust collecting roller, and a second support roller; and a dust collecting unit which is provided under the first pulley system and the second pulley system to collect foreign substances that escape from the first pulley system and the second pulley system.

Abstract: A floor cutting machine according to the present invention can comprise: a main frame for supporting equipment required for cutting a floor; a plurality of front wheels positioned at the front of the main frame when the proceeding direction of the floor cutting machine is the front and the opposite direction thereof is the rear; at least one rear wheel positioned at the rear of the main frame; a cutting frame which is a frame separate from the main frame, and of which one side is fixed near the rear of the main frame and the other side vertically moves; a cutting shaft positioned near the other side of the cutting frame; and a cutting blade capable of being fitted into both ends of the cutting shaft.

Abstract: This wire saw machine having a dust collecting apparatus comprises a main roller for moving a wire by rotation; a first pulley system including a first upper dust collecting roller, a first lower dust collecting roller, and a first support roller; a second pulley system including a second upper dust collecting roller, a second lower dust collecting roller, and a second support roller; and a dust collecting unit which is provided under the first pulley system and the second pulley system to collect foreign substances that escape from the first pulley system and the second pulley system.

Abstract: A floor cutting machine having a dust collection cover coupled thereto may comprise a main frame having a first dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine; a plurality of front wheels located at a front of the main frame; at least one rear wheel located at a rear of the main frame; a cutting frame having one side fixed to a vicinity of the rear of the main frame and the other side configured to be moved upwards and downwards; a cutting blade fitted on opposite sides of a cutting shaft located in the vicinity of the other side of the cutting frame; and a front frame detachably connected to the front of the main frame, the front frame having a second dust collection cover fixing pin configured to attach the dust collection cover to the floor cutting machine.