Pneumatic drill noise muffler and dust removal apparatus

Claim 1

A detachable dust remover and noise suppressing assembly for a pneumatic drill having a normally open exhaust port, a pneumatically operated elongated work tool and a front head releasably securing said tool, comprising in combination: a. a rigid housing providing internally thereof and on one side an inverted frustoconical-shaped opening and on an opposite side an annular opening and a cavity connecting and between said openings, said housing further providing a passageway extending laterally from and communicating with said cavity and mounting both an exhaust gas ejector inlet and an auxiliary gas ejector inlet in said passageway thereby providing when gas is ejected from either inlet a partial vacuum in said cavity; said passageway terminating in an exhaust opening; b. holding means adapted to releasably secure said housing to the front head of said pneumatic drill with the tool of said drill passing through said annular opening, said cavity, and said frustoconical opening of said housing and with said front head positioned adjacent to and effecting a substantially airtight seal around said annular opening; c. a collapsible type tube fixed at one end to said housing adjacent said frustoconical opening and arranged to normally enclose and provide a cavity surrounding said tool and in a manner which places the interior of said tube in communication with said frustoconical opening, said tube terminating in a bottom end designed to normally engage the work surface surrounding said tool; d. conduit means formed of a sound absorbing material connecting the exhaust port of said drill to said exhaust gas ejector; e. fitting means adapted to connect and open said auxiliary gas ejector inlet to an auxiliary gas supply when used and to close said auxiliary gas ejector inlet when not in use; and f. conduit means adapted to be connected to said passageway exhaust opening and being effective to remove from the operating area of said drill exhaust gas and dust carried from said work surface through said collapsible tube, said frustoconical opening, said cavity, said passageway and said exhaust opening by means of said partial vacuum.