US 3380196 A
Description (OCR text may contain errors)
April 30, 1968 5. A. MA BILLE SURFACE TREATING APPARATUS 2 Sheets-Sheet 1 Filed Jan. 19, 1965 Hal/I22.
m 2 Z M /m w April 30, 1968 G. A. MABILLE SURFACE TREATING APPARATUS 2 Sheets-SheetZ Filed Jan. 19, 1965 Inventor Georges Amhan y Mobil/e United States Patent 0 3,380,196 SURFACE TREATTNG APPARATUS Georges Anthony Mahille, Villepreux, France, assignor to Prornecam Sisson-Lehmann, Saint-Denis, Seine, France, a corporation of France Filed Jan. 19, 1965, Sar. No. 426,487 6 Claims. (Cl. 519) ABSTRACT OF THE DISCLOSURE A mobile surface treating apparatus including centrifugal impeller means for impelling a concentrated stream of particulated material against a surface to be treated, and means for collecting the particulate material after the same has impinged on the surface and for feeding the material back to the centrifugal impeller means by suction.
The invention relates to means for the projection of solid particles for the mechanical treatment of plane or fiat surfaces for the purpose of modifying their physical or mechanical characteristics, or their surface finish, or their shape.
The systems presently known can be classified under two groups.
In the first group can be classified those stationary-type of machines in which the surface to be treated is in relative motion with regard to the flow of particles in order to bring the entire surface within the sphere of action of the machine.
As such machines must be tight as regards the abrasive particles used, and as regards the dust produced, they must operate in closed circuit, which means that the surface under treatment must be entirely enclosed.
When the parts to be treated are long and thin, these machines are generally shaped like a tunnel, a relative imperviousness being obtained by means of chambers called sluices or lock-chambers situated fore and aft of the treatment chamber. When the parts to be treated are both long and large, as in the case of metal in sheetform, for example, these three chambers take on very large dimensions, so that means are required for collecting the projected particles spread over a large surface and that a large volume of air is required for collecting the dust.
Moreover, when the part under treatment comprises horizontal surfaces, a certain quantity of particles remain on the part and the expulsion of these particles requires the use of auxiliary means such as a blower or cyclone,
Again, transfer of the part under treatment requires an area fore and aft of the lock-chamber at least twice as large as that of the part itself. In this area are generally found various fixed handling devices, usually cumbersome and costly.
Belonging to the second group are various devices, mobile in respect of the part to be treated, which is generally fixed. These devices may or may not carry their own systems for the recuperation and dedusting of the particles utilized during the treatment.
The invention relates more particularly to devices of the second group equipped with a turbine for the projection of solid particles.
The object of the invention is the treatment of plane or flat surfaces, whatever their position in space (in particular the invention makes possible the treatment of the top part of horizontal surfaces) in a continuous manner, proiection, recuperation and dedusting of the particles utilized for the treatment being continuous.
An improvement, according to the invention, consists in submitting the flow of particles, before its impact on the part to a device for increasing the concentration of the particles in the form of a nozzle projecting the particles in lamellated formation of a given size.
The improvement confers on the products obtained a uniform treatment, the intensity of the bombardment being generally uniform over the whole surface. It also limits the self-destruction of the system resulting from the rebound of the particles.
The device for increasing the concentration of the particles may take on different shapes in harmony with the section of the part to be treated.
One of the direct applications of the invention is shotpeening for descaling and cleaning large size sheets.
The invention also covers the mechanical treatment, by means of the projection of particles, of plane surfaces which cannot be displaced, such as floor coverings, for example.
Other characteristics and advantages will now be made clear by the following description of an embodiment of the invention of a non-restrictive character.
Referring to the accompanying drawings:
FIG. 1 is a partially sectional side elevation of this embodiment of the invention;
FIG. 2 is a perspective view;
FIG. 3 is a partly sectional view and an elevation of a modified form of the embodiment;
FIG. 4 is a partly sectional view and an elevation of another form of construction.
In the embodiment under consideration, the unit is carried by a frame, mobile relatively to the surface to be treated, such frame or other carrying system remaining outside the scope of the invention.
In this form of the invention, the flow of particles generated by the turbine 1 is concentrated by the nozzle 2 and entering the chamber 3 accomplishes the required treatment.
After their impact on the part under treatment, the particles in suspense in chamber 3 are drawn by the suction of the dedusting space 4, the chamber 3 finding its limits in a sealing ring 5 in contact with the surface 6 under treatment so as to avoid the projection of particles and dust towards the exterior.
The sealing ring is pervious to the air, and atmospheric air is drawn in at a rapid speed into chamber 3, the ring acting as a screen for stray particles.
The dedusting space 4 of chamber 3 is connected by ducts 7 to an expansion chamber 8 on which is directly mounted the dedusting ventilator 9.
The particles retained in the expansion chamber 8 fall into a reservoir tank 10 which feeds the turbine 1 by gravity, the flow being controlled by a diaphragm adjusted by means of a handle 11.
The expansion chamber 8 is set so as to retain only the quantity of particles, in proportion to the flow of air sucked in, sufiicient to carry out the required treatment.
According to the invention, the level of the particles in the reservoir 10 remains generally constant since the circulation is continuous.
This accumulation of particles in the reservoir generates a back pressure such that the flow of air from the chamber 3 to the expansion chamber 8 passing through the turbine, that is to say, outside of the suction ducts, can be considered as nil.
The particles which are too small and also the dust carried along with the particles into the dedusting chamber 4 are separated from the suction air by a filtering device 12 functioning according to a separating principle based on the porosity of the walls.
In the embodiment shown in FIG. 2, the filtering element consists of an oblong collector 12, supported by a flexible pole 13.
Flexion of this support being proportional to the weight of dust contained in the collector, discloses, when the machine is stopped, to what extent the dust collector is full.
In the modified form of embodiment shown in FIG. 3, the machine comprises a chamber in contact at its open side with the surface to be treated 21. The stream of particles thrown out by the turbine 22 is concentrated by the restricted opening of the nozzle 23 before striking the surface 21. A brush-type seal 24 prevents any leakage between the wall of the chamber and the surface 21. A conduit 25 puts the inside of the chamber in communication with the atmosphere. Baflies built into the walls of the conduit prevent the particles from straying into the atmosphere.
After striking the surface under treatment, the particles and the air are carried away by the ducts 27 to the upper part of the cylindrical reservoir 28, the outlet of these ducts being positioned tangentially in respect of the reservoir walls.
A suction nozzle 29 is mounted axially above the reservoir 28 and communicates with a ventilator 30 driven by a motor 31. The particles retained in the reservoir 28 fall to the bottom of the reservoir and collect in a hopper 32 fed directly by the reservoir. These particles then feed the turbine through pipe 33, which directs their fiow into chamber 20.
The whole system is mounted on a frame 35 which supports the weight of the system so as to avoid crushing the brush 24.
In the form of construction shown in FIG. 4, the machine is generally similar to that which has just been described and is carried by a chassis fitted with wheels 42 which can be driven by a motor 43 and which run on rails 41. The frame 44 which carries the active unit (proiecting the abrasive particles) is itself supported on the chassis 40 by rollers 45 running on rails 46 rigidly mounted on the chassis 40.
Displacement of the active unit is controlled by a hand wheel 47 driving through a gear and chain drive, one of the pairs of rollers 45. Adjustment of the height of .the active unit is obtained by means of a hand wheel 48. The frame of the active unit is itself supported by rollers 53 in contact with the surface to be treated 21.
Also visible in FIG. 4 are the motor 49 driving the turbine 22, a lever 50 for controlling the flow of abrasive particles, and also a dust collector or filtering element 51 communicating with a ventilator 30 and supported at its outer extremity by a flexible pole 52.
The invention is not limited to the embodiment herein described but to all variations within the scope of the in- Garden.
What I claim is:
1. A mobile surface treating apparatus comprising, in
combination, chamber means having an open end adapted to be directed against a surface to be treated; a nozzle located at least in part in said chamber means and having an outlet end directed toward said surface and an inlet end; centrifugal impeller means located above and substantially aligned with said inlet end of said nozzle for impelling particulated material in downward direction through said nozzle against said surface; a reservoir arranged above said impeller means and having an inlet opening and an outlet opening; passage means providing communication between said outlet opening of said reservoir and said centrifugal impeller means; and suction means communicating with said chamber means laterally from said outlet end of said nozzle and with said inlet opening of said reservoir so that particulated material after having impinged on said surface is transported from said surface by suction into said reservoir to be recirculated by said passage means and said impeller means through said apparatus.
2. An apparatus as defined in claim 1, and including expansion chamber means upstream of and communicating with said inlet opening of said reservoir, said suction means feeding said particulated material from said chamber means into said expansion chamber means.
3. An apparatus as defined in claim 2, and including filter means communicating with said suction means for separating dust from said particulated material.
4. An apparatus as defined in claim 3, wherein said filter means comprises a container having porous walls, and an elongated flexible member supporting said container on a free end thereof and being arranged to be flexed to an increasing degree as said container fills up with dust to thus indicate the amount of dust in said container.
5. An apparatus as defined in claim 1, and including adjustable valve means in said passage means for regulating the amount of particulated material passing from said reservoir into said impeller means.
6. An apparatus as defined in claim 1 and including support means for supporting said chamber means and the other components of said apparatus movable over a substantially horizontal surface to be treated.
References Cited UNITED STATES PATENTS 2,263,321 11/1941 Unger Sl9 2,455,514 12/1948 Mead 5l8 2,810,991 10/1957 Mead et al. 51-8 3,015,913 l/1963 Anderson 51-9 3,034,262 5/ 1962 Pawlson 519 3,075,318 1/1963 Dilliard et al 518 3,262,228 7/ 1966 Schenck 51-9 LESTER M. SWINGLE, Primary Examiner.