Hopper, for collecting debris from drilling, is thin sheet of material with rear face stuck temporarily against wall, and front face having pocket placed under work area

摘要

The hopper consists of a thin sheet of material (1) whose rear face (2) is placed against the wall (M). The front face (3) contains a pocket (4) with the entry to the pocket (6) just below the work area where there is an opening (5) in the sheet. The rear face (2) surrounding the opening is provided with a layer of self-adhesive material (7) for temporary fixing it onto the wall.