Insulated cooling boot for power tool
AssigneeMilwaukee Electric Tool Corporation
InventorBernhard Palm
Life of this patent
Estimating the term…
Abstract
The in-line saw has a handle, a motor housing and a gear case which contains a drive mechanism which imparts a reciprocating action to the blade. The drive mechanism generates heat. The gear case is covered by an insulating boot which has internal ribs which contact the gear case and form air flow channels. The motor housing has air openings near the handle and the fan mounted on the motor drive shaft draws cooling air through the slots over the motor and out the space between the gear case and the motor housing except that the boot extends partially over the slot to divert air to the space between the boot and the case. The cooling air leaves the cooling space at the front of the boot to blow sawdust from the area of the blade. The boot is electrically insulating and covers the metal gear case.
Claims4
A hand power tool including motor housing having a handle at one end and a gear case at the other end,
- a transmission in said gear case, said transmission tending to build up heat,
- a motor in said housing and having a shaft driving said transmission,
- a fan in said housing driven by said motor,
- air entry slots in said housing and an air exhaust space between said gear case and said housing so said fan can draw air into said housing through said slots and exhaust it through said space,
- an insulating boot fitting over said gear case and projecting partially over said space between the gear case and the housing to divert cooling air flow between said boot and said gear case,
- and spaced parallel ribs on the interior of said boot running lengthwise of said boot to channel cooling air flow forward between said boot and said gear case,
- said cooling air leaving the space between said boot and said gear case adjacent the front of said power tool to blow on the working area of the tool to remove debris from the working area.
Dependencies are inferred from the claim text.