Patent ID: 9577493
Date: 2017-02-21
CPC Classifications: B23Q,B25C,B25F,H02K

Claim:
1. A hand-held portable battery powered fastening tool comprising: a housing having a housing interior, a forward end, and a rearward end, the forward and rearward ends defining a housing axis; a handle extending from the housing; each of said housing, housing interior, and rearward end comprising an upper portion above said housing axis and a lower portion below said housing axis when said handle is oriented so as to extend vertically downward from said lower portion of said housing; a motor assembly comprising an outer rotor motor having a fixed motor shaft defining a motor axis and an outer rotor, said motor assembly being mounted in said housing, said motor shaft being fixedly mounted in the lower portion of the housing interior transverse to said housing axis; a fan driven by said motor assembly and journaled to said motor shaft; a plurality of intake vents formed in the lower portion of the rearward end of said housing and a plurality of exhaust vents formed in said forward end; a confined air passageway in the housing interior, the passageway including a first portion in the rearward end, the passageway communicating directly with said plurality of intake vents, said first portion being defined by an internal wall that confines said first portion to the lower portion of said housing interior, and a second portion connected downstream of said first portion and communicating with said plurality of exhaust vents and with the first portion, wherein said fan is configured to draw air from an exterior of the housing through said intake vents into and through said air passageway and expel the air to the exterior of the housing through said exhaust vents; and an electronic control module mounted in the rearward end of the housing adjacent to said intake vents; wherein said second portion of said air passageway includes a flow path through said outer rotor motor, wherein air drawn into said air passageway cools said electronic control module before flowing through said flow path and cools said motor assembly.