WO2005025792A1

WO2005025792A1 - Suction system for debris that results from the use of portable electric drill

Info

Publication number: WO2005025792A1
Application number: PCT/BR2003/000132
Authority: WO
Inventors: Carlos Roberto Bonfim Oliveira
Original assignee: Carlos Roberto Bonfim Oliveira
Priority date: 2003-09-16
Filing date: 2003-09-16
Publication date: 2005-03-24
Also published as: AU2003260203A1

Abstract

Suction system for debris that results from the use of portable electric drills, characterized by a transparent, flexible overhead intake coupled to the back side of the chuck base, appropriate for taking debris in and guiding the use of suction made by the drill, a cone that protects the fitting between the drill and the chuck, a tubing coupled to the over head in take and to the storage and filtering chamber. The system is completed with a protector for chuck spinning and a flexible tube additional suction system for debris that results from the use of portable electric drills, installed on external part of the tubing fitting to the air passage, that make possible the aspiration of other external debris.

Description

"SUCTION SYSTEM FOR DEBRIS THAT RESULT FROM THE USE OF PORTABLE ELECTRIC DRHJL". The presented suction system refers to the development of an electric-mechanical equipment designed to be coupled to portable electric drills currently used for domestic or professional services. The action of the electric drill produces debris and contaminating power from the surface being drilled. These debris and contaminating power are thrown in the atmosphere and, in most circumstances, they remain in places that are difficult to be cleaned, offering risk to the human health. Retaining these debris before being thrown in the atmosphere would be, in first analysis, a practical solution for the problem. There is only one related patent application dated March 21, 2000, filed by INPI, entitled "DEBRIS RETAINER FOR ELECTRIC DRILL". This system shows a solution for debris retention as a single support defined as "cylindrical shape bellows" that externally involves the drill and acts as a cupboard for the debris. The lack of a suction chamber adapted to hold the debris turns such proposal into a not very satisfactory one, mostly when we consider the fact that debris accumulation in the " bellows " is inevitable and their complete retention does not occur, hindering the normal drill's action, obstructing drill's spin and demanding constant cleaning to avoid debris expulsion to external atmosphere, provoked by the simple vibration of the machine. In existing market for heavy electric drills, common hardwork to industry, an specific suction system can be found. It is designed for debris suction while the electric drill is in use. The disadvantage of this system is easily verified by the use of an external vacuum cleaner coupled through a hose to the intake overhead built in the space between the drill and the chuck. This is an expensive add-in and is inadequate for the domestic electric drills, that are responsible for the largest demand in the market. The suction system for debris in portable electric drills achieves suction of debris and consequent guiding of these debris to a storage and filtering chamber, taking as an advantage the available electric drill's motor force without interrupting the already filtered air flow through the electric motor, cooling it and assuring its normal operation. This system's novelty and inventive activity are the revealing characteristics in the use of the electric drill's motor energy to accomplish a new function, which is the one of debris suction and conditioning to an specially adapted chamber. The technical solution presented in this patent application has revealed itself as efficient in relation to its objective; besides, the system adds the following advantages to the already known solutions: a) it accomplishes the complete suction of generated debris of the action of portable electric drills, avoiding the dissipation of these debris to the environment;

10 b) it does not allow debris accumulation close to the drill and to the chuck, suppressing regular pause for cleaning and consequently committing the normal drilling activity; c) it drops down the use of additional vacuum cleaner closely attached to the drill, easing equipment handling and reducing costs. The complete system (Fig. 01 - A) is formed by an overhead intake (Fig. 01 - B), a « c cone (Fig. 01 - C), tubing (Fig. 01 - D), a storage and filtering chamber (Fig. 01 - E), an accessory tube (Fig. 01 - F) and a protector for chuck spinning (Fig. 01 -G). The overhead intake will be available in many different models, and it is made with flexible, transparent material. It has several small holes in its front part to allow air input (Fig. 02 - A, B, C and D), and it is prepared to collect debris and to direct the suction action through the tubing. It is coupled to the back side of the chuck base (Fig. 03 - A and B), with at least 1.5 0 cm internal diameter up to a maximum value equal to the diameter measured at the chuck's back fitting CFig. 03 - C). Its length will vary according to the length of the drill being used and it must always be larger than the drill itself of about 0,5 to 2 cm in the front and of 3 to 5 cm in the back (Fig. 03 - D). Debris suction leads to the need of protecting the coupling between the chuck and the drill, which is accomplished by a cone made of flexible material, anatomically installed in the 5 chuck and the drill's base, in order to allow the normal movement of the drill at the same time that avoids the passage of debris through the fissures of the chuck's fitting base (Fig. 04 A and B). There is a rigid tubing for the air flow coupled to the overhead intake, that may be installed inside (Fig. 05 - A, B and C) or outside, related to the equipment case (Fig. 05 - D and E), that connects the overhead intake to the storage and filtering compartment. Tubing length may vary between 5 cm and 25 cm, according to the size of the electric drill, and it has a measured diameter between 5 mm and 30 mm. The system can also hold another solution for the storage and filtering chamber that can be installed inside the electric drill's case, in the lower part of the handle (Fig. 06 - A) or in the external (Fig. 06 - B) or internal (Fig. 06 - C) upper part of the back of the case, which length, height and width measures must be proportional to the case dimensions. The storage and filtering chamber model is also designed to be detachable (Fig. 07 - A and B) or fixed (Fig. 07 - C, D,E, F and G), and when installed in the drill's cable, it can be completely detached (Fig. 07 - B). The number of filtering layers can vary from one to three, and when more than one is used, each one of the layers will show pores with gradually reducing thickness and diameter (Fig. 07 E and F). Non-detachable models allow filters to be removed for cleaning (Fig. 07 - and, F and G). The operation of the system takes advantage of the electric drill's available motor ferce, specifically the ventilation generated by its internal cooling fen. This ventilation starts when the cooling fan rotates then the external air is aspired through the holes that compose the overhead intake and it is guided by the air tubing through the storage and filtering chamber. The absorbed debris are retained inside the chamber by the existing filters, and the air, already -filtered, is used to cool the motor and is later released to external atmosphere through the existing exhaust holes located in the electric drill's case (Fig. 08 - A). To accomplish suction effect, it is necessary to slightly alter the carcass of the electric drill. Existing air intake, usually located in the back of the available electric drills (Fig. 08 - B), must be replaced by the holes located in the forward/front part of the overhead intake (Fig. 08 - A), or when this is not coupled to the drill, it must be replaced by the area of the air tubing where the overhead intake is fitted in (Fig. 08 - C). The suction power is increased or decreased according to the thickness and the diameter of the cooling fan installed closed to the motor (Fig. 08 - D and E). It is a fact that the system achieves better performance, with respect to the suction power, when larger and thicker cooling fans are used in place of the existing ones (Fig. 08 - AND), as well as increasing easiness of use is verified when air tubing and filtering chamber are installed inside 5 drill's case (Fig. 07 - A) In this last case, the available internal empty spaces, common to most electrical drills, will be used to install the air tubing and the storage and filtering chamber, avoiding a significant shape changing in original electric drill's case. (Fig. 08 - A). The suction system can be disabled with the removal of the overhead intake or of the storage and filtering chamber cover. This procedure will not avoid normal use of the electric

10 drill. The system is completed with an additional vacuum-cleaner assignment for other types of external debris and remaining power. This can be accomplished by uncoupling the intake overhead and connecting an special accessory tube for aspiration in the external fitting of the tubing that links the intake overhead to the storage and filtering chamber (Fig.09 - A and B), ι c measuring between 10cm and 70cm of length and between 5 mm and 30 diameter mm. To protect the user, in the moment that he uses this additional resource, a piece of rigid material must be adapted in the front part of the chuck, in the same place where the overhead intake is coupled, which dimensions should allow the access to the chuck (Fig.09 - B).

Claims

1. Suction system for debris that results from the use of portable electrics drills, characterized by transparent flexible overhead intake, a cone, tubing, a storage and filtering chamber, a tube and a protector for chuck spinning (Fig. 01 - A, B, C, D, E, F e G).

2. Suction system according to claim 1, characterized by an overhead intake (Fig. 02 - A,B,C e D), with small holes in its front part and at least 1.5 cm internal diameter up to a maximum value equal to the diameter measured at the chuck's back fitting (Fig. 03 - ). Its length will very according to the length of the drill being used and it must always be larger than the drill itself from about 0.5 to 2 cm in the front and from 3 to 5 cm in the back (Fig. 03-D).

3. Suction system according to claim 1, characterized by a flexible cone, of which measures vary according to the thickness of the drill and the chuck's diameter (Fig. 04 - A e B).

4. Suction system according to claim 1, characterized by a rigid tubing of which length will vary between 5 cm and 25 cm and measured diameter between 5 mm and 30 mm (Fig. 05 - A,B,C,D e E).

5. Suction system according to claim 1, characterized by a storage and filtering chamber (Fig. 06 - A, B e C), measuring between 1 cm and 5 cm height, 5 cm to 15 cm length and 5 cm to 10 cm extension.

6. Suction system according to claim 1, characterized by one, two or three porous filtering layers with gradually reducing thickness and diameter (Fig. 07 - E e F).

7. Suction system according to claim 1, characterized by a flexible tube, measuring between 10 cm and 70 cm length and 5 mm and 30 mm diameter (Fig. 09 - A e B).

8. Suction system according to claim 1, characterized by a chuck's protector, made of rigid material, of which extensions are proportional to the chuck's (Fig. 09 - B).

9. Suction system according to claim 1 to 8, characterized by the utilization of the electric drill's available motor force, that absorb the external air to cool the motor, though the cooling fan rotation, guiding this air from the holes that compose the overhead intake and absorbing the debris that results from the drill's use though the tubing the storage and filtering chamber, making possible the filtered air passage, to cool the motor and its later exit though the existing exhaust holes located in the electric drill's case (Fig. 08 - A), increasing or decreasing the suction power, according to the cooling fan's thickness and diameter, installed near the motor (Fig. 08 - D e E).