Smoothing mill with suction, by depression in three stages, of d

Details Smoothing mill with suction, by depression in three stages, of d Smoothing mill with suction, by depression in three stages, of d

1994-07-08

1996-07-02

Kisliuk, Bruce M.

Abrading

Accessory

Guard or housing

451520, B24B 5506

Patent

active

055316395

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns smoothing mills for finishing the surfaces of manufactured articles or for preparing such articles for subsequent treatment.
Smoothing mills, particularly the disk type, are well-known tools and by means of an abrasive body, especially a rotating disk, are used for treating the surface of structures such as the body of a car, a piece of wooden furniture, flooring or thresholds of stone or wood, to obtain a good finish or to prepare the surface for further treatment such as painting.
Special devices enable the dust, produced by the abrasive body on the-surface to which said body is applied, to be sucked up and carried into chambers placed for the purpose, in order to keep the environment cleaner and healthier. Suction and damping down the dust produced by such work is an important aspect of the process.
In one known model there is a fan fitted onto the motor shaft that rotates the plate-shaped part carrying the abrasive disk.
The fan sucks up air and dust through a set of holes in the plate and in the abrasive disk and conveys it into a tube. Suction produced by the fan, moved by the same rotating shaft as that moving the abrasive disk, is in no way sufficient for the purpose.
To overcome this insufficiency use is made of a separate self-propelled electric suction fan (of the bin-type vacuum cleaner) whose suction tube is connected to the smoothing mill.
A drawback to this system is the awkward presence of the electric cable feeding the fan as well as the high consumption of energy involved.
Other systems comprise a fixed suction system having one or more articulated arms carrying suction tubes connected to one or more smoothing mills by couplings at the ends of said arms.
These fixed installations require a considerable investment and maintenance costs are also high.
Further, coupling the smoothing mill to an articulated arm of the system limits movement, and consumption of energy is even higher than that for a mobile suction unit.
Purpose of the present invention is to provide a smoothing mill comprising built-in means of dust suction which are more powerful, more effective and more efficient.
A further purpose is to exploit the air discharged by the motor and the compressed air from the machine, which would otherwise be lost, and this saves a great deal of energy. Subject of the invention is a smoothing mill comprising a suction duct for generated dust and a suction device made by fitting inside said suction duct one or more tubular ejectors each comprising an initial truncated-cone shaped chamber and a final cylindrical chamber.
Said ejectors are arranged coaxially in series, one partially inside another, with the truncated-cone shaped part preceding the cylindrical part, in the direction of suction. The compressed air enters the first of these ejectors through a coaxial nozzle.
Internal diameter of the cylindrical chambers is equal to the lesser diameter of the truncated-cone shaped chambers preceding them.
Internal diameters of the second ejector are greater than the corresponding ones of the first ejector while internal diameters of the third ejector are greater than the corresponding diameters of the second ejector, and so on.
In this way a smooth passage of air in the cavities among the ejectors arranged in series is assured.
The overall purpose is to obtain, for each ejector and by associated action of the truncated-cone and cylindrically shaped chambers, a high progressively multiplying capacity and suction power in the various stages of suction created by the ejectors arranged in series.
The first ejector lies practically inside the truncated-cone shaped chamber of the second ejector which in turn lies practically inside the truncated-cone shaped chamber of the third ejector.
In a preferred execution the smoothing mill is of the disk type.
Said disk is mounted at the end of the shaft of a motor and comprises a suction chamber placed behind said disk and communicating with the working area through a specially made aperture in the disk.
The dust suction duct communic

REFERENCES:
patent: 384076 (1888-06-01), Riedell
patent: 4058936 (1977-11-01), Marton
patent: 4422239 (1983-12-01), Maier et al.
patent: 4765099 (1988-08-01), Tanner
patent: 5218790 (1993-06-01), Huang
patent: 5228244 (1993-07-01), Chu
patent: 5319889 (1994-06-01), Rudolf et al.

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