| 摘要 |
<p>Punch has base ring (12) with two part configuration (12a,12b). One (12a) along cylindrical part allows adjustment of reservoir bell and fixing of it. Other (12b) has number of graded shoulders (12c) of different diameters which allow fixing of reservoir bell as function of exterior diameters. Cutting tool (14) has teeth (14a) which cut into wall as force is applied by reservoir bell on other side of wall. The punch has a screwed (11) bolt (11a), a base ring (12) which freely moves along the bolt axis, a reservoir bell (13) designed to fix and temporarily lock onto the base ring, and a cutting tool (14) screwed at the end of the bolt. The interior of the reservoir bell is used to hold circular disks cut from the wall. The bell has two successive zones (13a,13b). One (13a) a cylindrical part complementary to the ring (12). The other (13b) has a cylindrical cone shape with its smaller diameter facing the cutting tool. These two parts define a reservoir zone for the wall cutouts (15). The opening (13c) at the bell end allows the introduction of the cutting tool as its edge (13d) is pressed against the wall surface (P).</p> |
