Power tool with heat sink assembly

Details Power tool with heat sink assembly Power tool with heat sink assembly

2001-08-13

2003-04-22

Chervinsky, Boris (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S707000, C361S709000, C165S080200, C165S080300, C165S185000, C174S016300, C310S050000, C310S052000, C310S053000, C173S217000

Reexamination Certificate

active

06552904

ABSTRACT:

FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to power tools and, more specifically, to heat sinks in power tools for dissipating heat from the activation switch.
Variable speed cordless drills have included heat sinks to dissipate heat from the activation switch mechanism. These drills have included heat sinks which have been directly coupled with the switch assembly to dissipate the heat generated in the switch assembly. Also, the tools have included heat sinks positioned behind or adjacent to the drill motor. These heat sink mounting locations require the tool housing to be large enough to accommodate the bulk or size of the heat sinks. Thus, housings have tended to be larger to accommodate the heat sink. Further, the handle portions have been relatively large so that heat sinks could be mounted with the activation switch assembly.
The present invention provides the art with a heat sink assembly which enables the housing size to be reduced. Also, the present invention provides a heat sink which is positioned in the handle portion adjacent to the battery and remote from the switch. Also, the heat sink is positioned adjacent vents which provide cooling of the heat sink to enable better heat transfer.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the invention, a power tool comprises a housing with the housing having a motor portion and a handle portion. A motor as well as an output coupled with the motor are positioned in the housing. An activation member is coupled with the motor to energize the motor to drive the output. A power source is coupled with the motor and the activation member. A heat sink is coupled with the activation member. The heat sink is positioned in the handle portion of the housing adjacent a free end of the handle portion. The power source is ordinarily a battery. A field effect transistor is coupled with the heat sink and the activation member to dissipate heat to the heat sink.
In accordance with a second aspect of the invention, a power tool comprises a housing having a motor portion and a handle portion. A motor is mounted in the housing. An output is coupled with the motor. An activation member in the housing is coupled with the motor to energize the motor to drive the output. A battery is coupled with the motor and activation member. The battery is supported on the housing adjacent the handle portion. A heat sink is coupled with the activation member. The heat sink is positioned in the handle portion adjacent the battery. The activation member is ordinarily a switch. A field effect transistor is coupled with the heat sink and dissipates heat to the heat sink. The handle portion includes rails on its free end to receive the battery. The heat sink has an overall trapezoidal shape. The housing handle portion includes a shelf to receive the heat sink. Also, the handle portion includes vents adjacent the heat sink to enable passage of fresh air into and past the heat sink. The heat sink is positioned remote from the switch.
From the following detailed description, taken in conjunction with the drawings and subjoined claims, other objects and advantages of the present invention will become apparent to those skilled in the art.


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