Patent ID: 9273697
Filing Date: 2016-03-01
CPC Classification: B25F,F04B,F04D,H02K

Claim Text:
1. A power tool, comprising: a motor sub-assembly that includes a motor and a motor fan; one or more batteries arranged circumferentially around the motor and are configured to provide power to the motor; and a cooling fan disposed vertically above the motor sub-assembly and the one or more batteries during operation of the power tool, wherein the cooling fan is configured to draw air in an upwards direction, over the motor and the one or more batteries and through the cooling fan, thereby dissipating heat from the motor and/or the one or more batteries, and wherein the upwards direction is the same as a free convection direction associated with a density difference between hot air radiating from the motor and/or one or more batteries and surrounding cooler air.