Electric power device with integrated cooling system for controlling tools

Abstract

A device is provided that includes at least one motor part having a housing surrounding an electric motor for driving an active head part accommodating a tool such as a tool for grinding, sanding or the like, and a suction pipe intended to be connected to a suction device. The suction pipe leads to the housing of the motor part and the motor comprises a sealed high-frequency electric motor positioned in the central part of said housing in such a way that the sucked-in air circulates around the body of the motor.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority of French application no. 1157767 filed on Sep. 2, 2011, the entire contents of which is hereby incorporated herein.FIELD OF THE INVENTION[0002]This invention relates to the technical field of electric power tools used in the building and construction industries and relates more specifically to long arm sanders.BACKGROUND TO THE INVENTION[0003]Long arm sanders are known that include, with reference to FIG. 1, a grip and carrying arm (1) to which is fitted a motor part (2) in the median portion thereof, an active head part (3) at the free end thereof and a grip handle (4) between the motor part (2) and the active head (3). The active head part is in the shape of a curved neck and accommodates at the end thereof a sanding grind wheel (5).[0004]This type of equipment is commonly referred to in the relevant professional circles by the colourful term of “giraffe sander (trademark)” due to the particular shape o...

AI Technical Summary

Benefits of technology

The invention is about a long arm sander that is designed to be easy and cheap to use. The motor is cooled by circulating air from the waste suction system, which prevents it from overheating. The motor is positioned at the center of the device, which reduces space requirements. The use of a high-frequency electric motor means that the device is quieter and more efficient. The device also includes means for guiding the air around the motor to increase the cooling time. These features make the device more reliable and durable.

Problems solved by technology

Prior art long arm sanders thus have the drawback of having a bulky motor part.

Furthermore, the motor may well overheat causing permanent damage thereto should the vents for circulating the cooling air of the motor become blocked.

Moreover, the working dust may move inside the motor and cause the rotor or stator of said universal motor to short-circuit.

Indeed, the drawback of the motor part of prior art devices is that they allow the intake of air charged with abrasive dust or conductive dust which may well burn the rotor either by short-circuiting the blades of the manifold or by abrasion of the copper coil of said rotor.

This type of electric power tool has the same drawbacks as prior art long arm sanders.

This type of prior art tool has the drawback in particular of comprising a universal motor which has low efficiency, under 40%, is particularly noisy, the noise generated by the motor being about 90 db, gets very hot with a risk of insufficient cooling, and has a significant pressure loss, has life expectancy of about 3,000 hours, i.e. the wear time of the motor brushes.

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