Rack-mountable chassis with resilient side panels

In combination,

• a support rack having an access aperture with a height and a width W" between different pairs of opposed bounding edges, and
• a rack-mountable chassis enclosure having a single contiguously-enclosed internal volume with an at-rest external width measurement greater than said width W" of said access aperture through which the enclosure must pass for mounting, and comprising:
• a rigid front panel having a width greater than said access aperture width W" and forming a front boundary of said single contiguously-enclosed volume;
• a rigid back panel, of height and width each less than the corresponding height and width of said access aperture, and spaced from said front panel and forming a rear boundary of said single contiguously-enclosed volume;
• a first panel member having both a rigid wall portion defining a surface and a resilient portion protruding outwardly from said surface and bounding a portion of said single contiguously-enclosed internal volume, and extending between the front and back panels, with each of said rigid portion and said resilient portion forming part of another boundary of said single internal contiguously-enclosed volume, and with said resilient portion including a member formed of a resilient material;
• and
• an opposing panel member also extending between the front and back panels to form yet another boundary of said contiguously-enclosed volume, and spaced apart from said first panel member at a distance to define said at-rest external width of said single contiguously-enclosed volume;
• the said distance between resilient portion member of the first panel member and the associated opposing panel member being greater than said access aperture width W";
• the resilient portion member resiliently flexing inward, toward the opposing panel member, from a normal unflexed position, responsive to pressure from said access aperture edges during entry of the enclosure into the access aperture, and resiliently flexing outward for expansive return of the resilient portion member to the normal position once the pressure thereon is removed, to increase a total amount of the single contiguously-enclosed internal volume into which any apparatus which may be enclosed within said enclosure may move after the chassis has been moved to place the resilient portion member outside of said access aperture, relative to a total amount of the single contiguously-enclosed internal volume during passage of the enclosure resilient portion member through said access aperture.