Electrostatic air cleaner

Claim 1

In an electrostatic air cleaner having a cabinet, electrical components within the cabinet and a closure member for the cabinet, grounding means to connect at least some of said electrical components to ground upon opening of said closure member, said means comprising: at least two spaced contacts, one of which is electrically connected to at least one of said electrical components and the other of which is directly electrically connected to ground; an electrically conductive bridging element having a first operative position and a second operative position, said bridging element engaging both of said contacts in said first operative position and being spaced from both of said contacts in said second operative position; biasing means to bias said bridging element toward said first operative position; and a resilient operator connected to said bridging element and adapted to be engaged by said closure member when said closure member is closed and move said bridging element from said first operative position to said second operative position; said operator having a resiliency greater than said biasing means whereby said operator overcomes the force of said biasing means to maintain said bridging element in said second operative position when said closure member is closed, said biasing means being a coiled compression spring, said resilient operator being a coiled compression spring, and said bridging element comprising a circular metallic disc carried by said biasing means.