Hand-held power tool and method for operating a heating device of a hand-held power tool
AssigneeAndreas Stihl AG & Co. KG
InventorsHeinrich Leufen, Rolf Walter, Fried Berkenkamp
Life of this patent
Estimating the term…
Abstract
A hand-held power tool has a drive motor driving a tool and a generator. One or more heating devices having one or more heating elements are provided. The generator supplies the one or more heating devices with energy. A control device controls a power supplied to the one or more heating elements as a function of at least one operating parameter of the drive motor.
Claims18
A hand-held power tool comprising:
- a drive motor,
- a tool driven by said drive motor;
- a generator driven by said drive motor, wherein a power provided by said generator increases as an engine speed of said drive motor increases;
- one or more heating devices comprising one or more heating elements, wherein said generator supplies said one or more heating devices with energy;
- a control device controlling a power supplied to at least one of said one or more heating elements as a function of said engine speed of said drive motor;
- wherein the power supplied to said at least one heating element is reduced as a function of said engine speed relative to the power provided by said generator.
A hand-held power tool comprising:
- a drive motor;
- a tool driven by said drive motor;
- a generator driven by said drive motor;
- one or more heating devices comprising one or more heating elements, wherein said generator supplies said one or more heating devices with energy;
- a control device controlling a power supplied to at least one of said one or more heating elements as a function of at least one operating parameter of said drive motor;
- wherein said drive motor is an internal combustion engine comprising a carburetor and wherein one of said one or more heating devices is a carburetor heater;
- wherein said one or more heating devices have a temperature sensor for a temperature-dependent control of said power and wherein said temperature sensor is connected to said carburetor by a contact surface providing a thermally conducting connection;
- wherein said temperature sensor has a cover that thermally shields said temperature sensor except said contact surface.
A method for operating a heating device of a hand-held power tool comprising a drive motor, a tool driven by the drive motor, a generator driven by the drive motor, one or more heating devices each comprising one or more heating elements, wherein the generator supplies energy to the one or more heating devices;
- said method comprising the step of:
- controlling a power supplied by a generator to at least one of the heating elements as a function of an engine speed of the drive motor and reducing the power supplied to the at least one heating element as a function of the engine speed relative to the power provided by the generator.
A method for operating a heating device of a hand-held power tool comprising a drive motor, a tool driven by the drive motor, a generator driven by the drive motor, one or more heating devices each comprising one or more heating elements, wherein the generator supplies energy to the one or more heating devices;
- said method comprising the step of:
- controlling a power supplied by a generator to at least one of the heating elements as a function of at least one operating parameter of the drive motor, wherein, in the step of controlling, every other half wave of a voltage signal generated by the generator is blocked from being supplied to the at least one heating element when a limit value of the at least one operating parameter is surpassed.
Dependencies are inferred from the claim text.