| 摘要 |
<p>A press apparatus for forming knock-outs in sheet metal panels to be subsequently formed into electrical enclosures, in which the apparatus comprises a plurality of pairs of punch and die members with the punch and die members of each pair thereof being complementary. Each of these punch and die members is removably mounted in the apparatus by means of a screw-threaded member which is centrally located relative to the associated punch or die member and is disposed through a locating spigot which is presented by the punch or die member and is located within a complementary recess provided in the apparatus, at least some of these punch and die members each being further removably mounted in the apparatus by means of an anti-rotation locking pin which is disposed partially within a recess in the associated punch or die member and partially within a bore provided in the apparatus. The dimensions of and spacing between the screw-thread member and the anti-rotation locking pin by which each of the appropriate punch and die members are removably mounted in the apparatus are the same, so that the pairs of punch and die members, which are of different dimensions, may be removed and re-mounted in the apparatus in different positions, the screw-threaded member and anti-rotation locking pin by which each appropriate punch and die member is removably mounted in the apparatus being wholly within the periphery of said member as viewed in the direction in which said punch or die member and the other member of the appropriate pair thereof are operatively movable towards and away from one another, so that the punch and die members of adjacent pairs thereof may be disposed in contacting relationship with one another.</p> |
