JPH047904Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a portable power tool.

Conventional portable power tools generally have a structure in which cooling air from the motor is sucked in from the handle side and discharged to the tip tool side. Portable power tools configured in this way that are often used intensively during the cold winter months, such as power tools for cultivating shiitake mushrooms (shiitake drills) and electric chain saws, are The handle is constantly cooled by suction from the handle side, so even if the operator takes measures to protect himself from the cold, it is still cold and reduces work efficiency, and some workers who have used it for a long time may develop Raynaud's syndrome. It's becoming a problem. As described above, conventional portable power tools have taken measures to reduce vibration to some extent, but no countermeasures have been taken against low temperatures.

This invention was created in view of the above points,
The purpose of this invention is to provide a portable power tool that can improve work efficiency during the cold season.

That is, the present invention includes a stator held inside a frame, a rotor disposed opposite to the stator, a handle provided in a part of the frame and held by an operator, and a handle inside the handle. A portable power tool having a heating element disposed in the rotor, the heating element being connected to both ends of the winding of the rotor, whereby the heating element The voltage generated in the rotor windings causes heat to be generated.

Hereinafter, the present invention will be explained based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1 to 3. A portable electric tool, such as a shiitake drill, has a stator 2 and a rotor 3 housed inside a frame 1, and a handle portion 4 that is gripped by an operator is formed in a part of the frame 1.

In this embodiment of the shiitake mushroom drill configured as described above, a heating element 5 is provided in the handle portion 4, and the heating element 5 is caused to generate heat by supplying voltage generated in the winding (not shown) of the rotor 3. I did it like that. By doing so, the heating element 5 generates heat using the voltage generated in the winding, and it is possible to obtain a portable power tool that can improve work efficiency during the cold season.

In other words, the voltage generated across the windings of the rotor 3 during operation of the motor becomes a low voltage of about 80% of the motor supply voltage, and this generated voltage becomes even lower as the motor becomes overloaded. Become. Using the voltage generated at both ends of the windings of the rotor 3 as a power source, a heating element 5 such as a stainless steel plate is provided along the inner peripheral surface of the handle portion 4, and the heating element 5 is made of an insulator 6 such as silicone rubber. coated with. When the temperature of the heating element 5 rises and the outside temperature rises further to reach the upper limit temperature that the operator can grasp, a switch 7 is placed in a position that can be operated from the outside to open and close the circuit of the heating element 5.
has been established. By doing so, the temperature of the heating element 5 can be increased appropriately and safely. In other words, the temperature of the handle portion 4 can be increased appropriately, the handle portion 4 becomes warmer, work efficiency during cold seasons can be improved, and occupational diseases such as Raynaud's syndrome can be prevented. .

In this embodiment, the power supplied to the heating element 5 is taken out from both ends of the winding of the rotor 3, but the power supply is not limited to this, and it may be taken out from a part of the winding of the rotor 3. good. By doing so, it is possible to supply a lower voltage than in the above case, depending on the turns ratio of the winding.

As described above, according to the present invention, the handle portion becomes warmer and the working efficiency during the cold season is improved, thereby providing a portable power tool that can improve the working efficiency during the cold season.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view of a shiitake mushroom drill which is an embodiment of the portable power tool of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a portable power tool of the present invention. FIG. 2 is a circuit diagram of a heating element of an embodiment of a power tool for use. 1...Frame body, 2...Stator, 3...Rotor, 4
...Handle part, 5...Heating element, 6...Insulator.

Claims (1)

[Scope of utility model registration request] A stator held inside a frame, a rotor disposed opposite to the stator, a handle provided in a part of the frame and held by an operator, and a rotor disposed within the handle. What is claimed is: 1. A portable power tool having a heating element, wherein the heating element is connected to both ends of a winding of the rotor.