Manner null in order to form the multiple holes of fixed interval in the roof board support component of the building which is the built-in type device, and in the midst of constructing are used for the installation of the roof board

摘要

PURPOSE: To make a plurality of holes at desired spaces previously determined by using a narrow housing having a built-in type oil reservoir and a hydraulic pump. CONSTITUTION: A support housing is provided with a guide means for temporarily placing a housings 12 on a support beam JB of a building, an adjustable gauge means and a punching means for making holes in the roof supporting member of a building. In addition, the support housing includes a square body having an oil reservoir containing oil and a means to forcibly feed oil to a punching means from the oil reservoir. This means comprises an oil pump and a motor for operating the pump.