Sheet metal knock-out

A knock-out detail in a sheet metal wall, the knock-out detail defining a knock-out which is selectively removed along a boundary to provide a knock-out opening through the wall, comprising:

• first and second slits in the wall positioned along the boundary of the knock-out;
• the knock-out having a land which separates the first and second slits in which portions of the first and second slits adjacent the land are positioned in a first line which is interrupted by the land;
• and
• the wall including a break out opening adjacent to the land, outside the boundary of the knock-out, the land including break portions which separate the break out opening from the first and second slits, the shortest distance between the break out opening and the first slit being along a second line which is at an angle of approximately forty-five degrees with respect to the first line, the shortest distance between the break out opening and the second slit being along a third line which is at an angle of approximately forty-five degrees with respect to the first line, the break portions being along the second and third lines, the break portion being severed to connect the first and second slits together through the break out opening during removal of the knock-out.

A knock-out in a sheet metal wall of a housing, such as for electronic equipment, the knock-out detail defining a knock-out which is selectively removed along a boundary to provide a knock-out opening through the wall, comprising:

• at least three slits in the wall which each have a first end and a second end, the slits being oriented with the first end of one slit adjacent the second end of another slit and being positioned along the boundary of the knock-out;
• the wall including a plural lands, each land being respectively positioned between and thereby associated with a first end of one slit and a second end of another slit;
• and
• plural break out openings through the wall, a respective break out opening being located adjacent to and associated with each land outside the boundary of the slits, the associated land having break portions which separate the associated break out opening from the first and second ends of the slits associated with the land, the break portions being severed to connect the first and second ends of the slits together through the break out opening during removal of the knock-out.

A knock-out detail in a sheet metal wall of a housing, such as for electronic equipment, the knock-out detail defining a knock-out which is selectively removed along a boundary to provide a knock-out the first end of each slit being positioned adjacent to a opening through the wall comprising:

• at least three slits in the wall each of which have a first and a second end, the slits being oriented with the first end of one slit adjacent the second end of another slit and being positioned such that extending the slits would define the border of a geometric shape;
• the wall including plural lands, each land being respectively positioned between and thereby associated with a first-end of one slit and a second end of another slit and in which the lands project outwardly from the knock-out beyond the border of the geometric shape;
• and
• plural break out openings through the wall, a break out opening being located adjacent to and associated with each land outside the border of the geometric shape, and in which the break out openings are outside of the borders of the slits, the associated land having break portions which separate the break out openings from the first and second ends of the slits associated with the land, the break portions being severed to connect the first and second ends of the slits together through the break out openings during removal of the knock-out.

A housing for electronic equipment having a wall comprising:

• at least one knock-out in the wall which is selectively removed to provide a knock-out opening through the wall;
• the knock-out having a peripheral boundary in the form of a closed geometric shape;
• a first set of at least three slits provided about the boundary, the slits being sized to maintain effective electromagnetic interference shielding and each pair of slits being separated by a respective land portion of the wall;
• wherein the wall defines a break-out opening adjacent to each land outside the boundary of the closed geometric shape, the land portion including a break portions which separate the break out opening from the adjacent slits, the break portions being severed to connect the first and second slits together through the break out opening during removal of the knock-out.

A housing for electronic equipment having a wall comprising:

• at least one knock-out in the wall which is selectively removed to provide a knock-out opening through the wall;
• the knock-out having a peripheral boundary in the form of a closed geometric shape;
• a first set of at least three slits provided about the boundary, the slits being sized to maintain effective electromagnetic interference shielding and each pair of slits being separated by a land portion of the wall;
• a break out opening adjacent to each land outside the boundary of the closed geometric shape, the land including break portions which separate the break out opening from the adjacent slits in which the end portion of the slits separated by a land are along a line and in which the break portion extends at an angle of approximately forty-five degrees from the line to the break out opening adjacent to the land.