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Publication numberUS3034262 A
Publication typeGrant
Publication dateMay 15, 1962
Filing dateNov 5, 1959
Priority dateNov 5, 1959
Publication numberUS 3034262 A, US 3034262A, US-A-3034262, US3034262 A, US3034262A
InventorsEugene T Pawlson
Original AssigneeEugene T Pawlson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Resurfacing and finishing machine
US 3034262 A
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Description  (OCR text may contain errors)

May 15-, 1962 E. T. PAWLSON RESURFACING AND FINISHING MACHINE 2 Sheets-Sheet 1 Filed Nov. 5, 1959 INVENTOR.

E. T. PAWLSON RESURFACING AND FINISHING MACHINE May 15, 1962 Filed Nov. 5, 1959 2 Sheets-Sheet 2 Iillllllll Illllllll v INVENTOR EUGENE T. PAwL'SoN BY fine,

' fine 3,034,262 RESURFACING AND FINISHING MACHINE Eugene T. Pawlson, RD. 1, Averill Park, N.Y. Filed Nov. 5, 1959, er. No. 851,180 8 Claims. (Cl. 51-9) This invention relates to an improved type of surface finishing or re-finishing device, having particular reference to such a device that is a self-contained unit for treating plane, curved, or even irregular surfaces, whether held substantially horizontally or vertically, by impinging there against and rebounding therefrom abrasive or other particles traveling at high velocity and continuously recovering the particles and recycling the same, and the provision of such a device is the principal object of the invention.

1 am well aware that there are many sand-blasting or sand-throwing devices but these are distinguishable in structure and function from the present invention which utilizes a combination and arrangement of parts that has greater universality in accomplishing new and improved results that are unobvious of attainment from previous devices.

Generally, it is an object of the invention to provide such' a device that is economic of manufacture, simple, yet sturdy and durable of construction, which will operate with relative freedom from wear and tear or other mechanical difiiculties, and that is well suited to the purposes for which it is intended.

More specifically, it is an object of the invention to provide such a device in the form of a self-contained unit, which comprises a housing having a first chamber with an outlet for expelling abrasive or other particles therefrom, a second chamber connected to the first chamher which has an inlet thatis angularly disposed adjacent to such outlet for recovering the particles therein, an outlet-inlet opening in the housing in common communication with the outlet and inlet of both said chambers 2 the sweeps preferably being radially grooved or rearwardly stepped along their throwing surfaces.

Another object of the invention is the provision of such rotary means wherein the upper side of the disk and, the forward side of the sweeps are faced with a plastic material, preferably in the form of a removable plastic disk having upstanding plastic sweeps conforming in configuration to the first sweeps, with openings in the plastic disk to receive the same in order that such plasticdisk can be fittedinto face-to-face relation with the underlying disk and sweeps as protection against the abrasive particles.

and will in part appear hereinafter.

The invention accordingly comprises] the features of construction, combination of elements, and arrangement of parts that will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the claims. 7 I

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description, taken in connection with the accompanying drawings, in which:

FIG. 1 is a top view of an embodiment of the device tilted into operative position;

FIG. 2 is an elevational view, with parts broken away and partly in section, of FIG. 1;

FIG. 3 is a sectional view taken along the line 3-3 of FIG. 2 and looking in the direction of the arrows:

FIG. 4 is a perspective view, with parts broken away and partly in section, illustrating a partially plastic faced rotary means;

FIG. 5 is a perspective view of a fragmentary portion of such a rotary member without the plastic facing; and

FIG. 6 is an elevational view of a fragmentary portion of the housing illustrating a form ofair valve to regulate the volume of air being recycled with such parthrough which such particles are ejected from the first chamber to be impinged against such surface and rebounded by deflection into the second chamber, a return passage for the particles from the second to the first chamber, and rotary means within the first chamber to eject the particles therefrom, and simultaneously to recycle rebounded particles thereto from the second chamber by means of such passage.

Another object of the invention is'to provide the second chamber with a plurality of bafiies extending transversely of its walls to collect and maintain the rebounded particles in the bottom of the chamber,

A further object is to provide a transverse partition between the side walls of the second chamber but spaced from the bottom thereof to form an inner and outer passage for directing rebounding particles to the chamber bottom when the outlet-inlet opening is held at a substantially angular position from the horizontal.

Yet another object is to provide such a partition with a hinged bafiie on its inner side, intermediate its ends, to close off the inner passa e when the outlet-inlet opening is tilted to a substantially horizontal position.

Another specific object is to provide a return passage for such particles in the form of a conduit extending from adjacent the bottom of the second chamber which terminates at its opposite end within the first chamber with its axis substantially normal to and offset from'the center of the rotary means.

A further specific object is the provision of a rotary means comprising a disk and a plurality of radially disposed particle throwing sweeps mounted on its upper surface.

It is also an object to provide sweeps that are curved at their outer ends in the direction of the ejecting outlet,

ticles. I t

Referring now more particularly to the drawings, there is indicated generally at ldsuchua device which constitutes a self-contained unit.

' Such a unit includes a housing indicated generally at:

1.1, having a first chamber 12 with an outlet indicated generally at 13 for expelling abrasive or other particles tangentially therefrom, as indicated by the arrows in FIG. -2, in a sweeping pattern across a surface 17 as shown generally at 14 in FIG. 1. a g

The housing 11 is provided with a second chamber indicated generally at 15 that is connected to the first chainber 12 as part of the housing 11.. This second chamber has an inlet opening indicated generally at 16 that is angularly disposed adjacent the outlet 13 for recovering the particles passing there-through, after they have been rebounded from the surface 1'1 and deflected downwardly, into the chamber 16, also'asindicated by the arrows in,

FIG. 2 v p r An outlet-inlet opening, indicated generally at 18, in the housing 11 is in common communication with the outlot 13 of the chamber 12, and .the inlet 16' of the chain must pass through the outlet-inlet opening 18 to be" ejected from the first chamber outlet 13 and be impinged against the surface 17, whether or not the latter be plane, curved or irregular, and the particles will be rebounded properly and deflected into the second chamber.

Inorder that the outlet-inlet opening 18 may enhance Patented' ll/lay 15, 1962 the efficacy of the operation, it should be provided with a soft, resilient shroud'or grommet 19*, made of rubber orothersuitable material, which readily can be replaced and in part will be in a swirling condition, there is provided a passage-way in the form of a conduit 22 which preferably is rigid and made integral with the chamber along one corner thereof to terminate in an opening adjacenfthe bottom. The remaining portion of the conduit may consist ofa resilient pipe, or rubber hose connection23, that extends from the portion 22 upwardly and out of the top of the housing and downwardly to penetrate the chamber 12, as indicated generally at 24. "It will' be observed that this endtof the hose has its axis substantially perpendicular to a rotary means indicated generally at 25 in the chamber 12. Of particular importance is the fact thatlthe'end of the hose 24 is oil-set from the center of the rotary means to provide a maximum sweep and throwingefii'ect for/the particles as will more fully appear hereinafter.

The rotary means '25 comprises a disk '26 mounted to rotate with a shaft 27 that mayconstitute, the shaft of any suitable low horsepower motor 28 indicated in dotted line position, On the upper surface of the disk 26 there is providedia plurality of radially disposed particle throwing sweeps 29 which preferably are curved at their outer ends in the direction of the ejecting outlet 13 as shown in drawingv Preferably, also, these sweeps on their forward 7 faces are radially grooved, or stepped, as indicated generally at 30; The offset position of the end of the conduit 24, above mentioned, it will be observed, is such that it falls in approximiately the; 3rd quadrant overlying the sweeps, i;e., in such a position as to feed the particles to the sweeps in a manner suchthat the particles will 'beswept outwardly tdwards the ends thereof, after the particles have passed through an arcl within a range of approximately 180 to 270 tangentially to be ejected or sprayed in aswept pattern from the outlet 13, and, con-- sequently, thro ugh the outlet-inlet 18 across the surface 17, as above indicated.

The above described device, being readily portable and self-contained, may be provided with dual handles o epositely disposed on thehousing, such as those indicated at 31,, one of which may-be provided with a push b utton switch 32 to start and stop the motor 23.

Itwill be understood that the high velocity of the abrasive particles, whensuch are used, might readily tend to. wear downthe sweeps, especially at their ends, and to avoid this such sweepsshould be made of any suitable hardmetal that would unaffectedby such action offace relation on its bottom side with the upper surface of the disk 26.

Such plastic disks are readily replaceable by merely removing screws 35 that pass through a cover plate35 to enter the threaded openings 37 in the metal sweeps 29,

Since the rotary means'ZS creates a vacuum by sucking air as well as particles through the conduit 22, to dis tribute such particles off center of the rotary means, it is. desirable to be able to control the volume of such air being circulated. This is readily done by an adjustable cover plate or plates 38 covering the screened opening 39 at one or both sides of the housing 11 as shown in FIG. 6.

.As above indicated the device is intended to be tilted when in operation as. shown in FiG. 2. That is to say, it is tilted with respect to the outlet-inlet opening 18 so that the particles are angularly deflected into the return chamber 15.

As shown in FIG. 2, the device is held against a vertical surface but it can be held against any surface that is angularly disposed to the horizontal, However, when the face of the outlet-inlet opening 1 8 is held against a surface that is substantially horizontal, there is some-danger that the accumulated particles in the chamber 15 may fall out of the outlet-inlet opening 18. To prevent this,

7 the chamber 15 has been suitably provided with baflles.

Let it be note-:Lthat, regardless of the position of the device, whether being used vertically or angularly with respect to the horizontal', there is provided a plurality of downwardly sloped baffles 40,; 41 and 42 that extend transversely of the side walls of the chamber 12. Two of these baffles, namely, 46 and Marc connected to atrans- 1 verse partition or wall 43 that extends from a line approximately midway of the outlet-inlet opening 18, as at 44, to terminate short of the bottom of the chamber as atAS Thereby forming. a double passage indicated gem erally at43 and 43." that are in communication at the bottom oftlte chamber 15 adjacent the opening of the conduit portion 42. i

It will also be observed that thebaflle portion 42 is hinged torthe transverse partition, as at 46', so that the latter can beturned to thejdotted line position by means,

of a handle 47 (see FIG. I) to close oifthe chamber 43,"

inlet; and those already'collected in the chamber 15' will be prevented from falling from that chamber section 43' bythe rebounding particles being deflected therein and I the increased suction pulling-them through the recycling conduit; i

Such a device has many advantages and improvements and provides a. substantial number of new results. The

particles are constantly re-used by being rebounded from the particles; However, in certain cases where such-hard metal might; prove, to be too expensive, I- propose to face orcoat the leading surfaces of the sweeps with .a

suitable plastic material. Preferably, I do this by providing: a readily removable or replaceable plastic disk 33, i.e. of the same diameter as the metal disk 26. Radially disposed on the plastic disk, preferably integral there.- with and upstanding therefrom are a plurality of plastic sweeps 34. that conform in configuration to the stepped surfaces 39 of the sweeps 29 The disk 33, behind the Plastic; sweeps-34, is provided with openings to the rear thereof that conform in configuration to the base'of such sweep. 29:so that. theplastic diskoan be placed over the *metal disk 26. Thesweeps 29 will penetrate said openthe surface being treated and recovered by the trap or chamber 15 and so are rcadilynsubjected to recycling for re-use. This makes; for economy because such-a particle suction, orrecycling system providesjalight and well-diffused supply of such particles; to the throw-blades or sweeps 29. .Also,,the removable or replaceable plastic plates are for throw-away or disposablepurposes; This provides an advantageouselement of economy. 'Various sweeps of varying design may be used and. the rubber ings so that the stepped plastic surfaces will be brought into face-to-face relation" with the sweeps 29 and the if if bottom of theplastic disk- 32- willcome to rest in face-towork shield or shroud 19 may be curved or so configured as to substantiallyrencompass irregular or circular pieces to be treated. The device may be so held that the par ticles can be thrown horizontally, vertically or at any angle to achieve the desired result. Theportability of the device provides for various uses in Workshops or homes, for finishing masonry, woodwork or metal, including use in foundries, as well as auto body shops and the like. In place of abrasive particles, metallic shot may be used for peening or antiquing purposes and the like; and surfaces thatf are old and rusted, such as gas and oil storagetanks, may be cleaned for subsequent paint applications.

Since certain changes may be made-in the aboveconstruction, and difierent embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description, or shown the accompanying drawings, shall be interpreted as illustrative and not in a limiting sense. It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention what I claim as new, and desire to secure by Letters Patent is: v

1. In a device of thecharacter described, for use in treating plane, curved and irregular surfaces by impinging thereagainst and rebounding therefrom. abrasive particles traveling at high velocity and continuously recovering the rebounding particles to recycle the same, comprising a self-contained unit, including a housing having a first chamber with an outlet for expelling said particles therefrom, a second chamber connected to said first chamber and having an inlet angularly disposed adjacent said outlet for recovering said particles therein, an outletinlet opening in said housing in common communication with the outlet and inlet of said chambers and angularly disposed thereto through which said particles are ejected from said chamber outlet to be impinged against such surfaces and rebounded by deflection into said second chamber, means providing a return passage for said particles from said second to said first chamber, and a disk disposed within said first chamber and rotatably mounted therein with a plurality of radially disposed particle throwing sweeps mounted on the upper surface of said disk, whereby to propel said'particles therefrom and simultaneously to create an air flow to move particles from said'second chamber through said passage.

2. In a device as set forth in claim 1, and wherein said sweeps are curved at their outer endsin the direction of said first chamber outlet.

3. In a device as set forth in claim 1, and further characterized in that said sweeps are radially grooved on their forward faces. i

4. In a device according to claim 3, in which said grooves are rearwardly stepped.

5. In a device as defined in claim 1, and further characterized in that said housing is provided with an air valve to regulatethe volume of air being recycled with said particles.

6. In a device of the character described, for use in treating plane, curved and irregular surfaces by impinging thereagainst and rebounding therefrom abrasive particles traveling at high velocity and continuously recovering the rebounding particles to recycle the same, comprising a self-contained unit, including a housing having a first chamber with an outlet for expelling said particles therefrom, a second chamber connected to said first chamber and having an inlet angularly disposed adjacent said outlet for recovering said particles therein, an outlet-inlet opening in said housing in common communication with the outlet and inlet of said chambers and angularly disposed thereto through which said particles are ejected from said chamber outlet to be impinged against such surfaces and rebounded by deflection into said second chamber, .means providing a return passage for said particles from said second to said first chamber, a r0- tary disk within said first chamber to eject said particles therefrom and simultaneously to recycle rebounded particles thereto from said second chamber through said passage, a plurality of radially disposed sweeps mounted on ing in configuration, to said first sweeps, openings in said plastic diskto receive said first named sweeps, whereby said plastic disks and sweeps are fitted into faceto-face relation to provide protective surfaces for said first disk and first named sweeps against said abrasive particles.

7. in a device of the character described,'for use in treating plane, curved and irregular surfacesby impinging thereagainst and rebounding therefrom abrasive particles traveling at high velocity and continuously recovering the rebounding particles to recycle the same, comprising a self-contained unit, including a housing hav ing a first chamber with an outlet for expelling said particles therefrom, a second chamber connected to said first chamber and having an inlet angularly disposed adjacent said outlet for recovering said particles therein; an outlet-inlet opening in said housing in common communication with the outlet and inlet of said chambers and angularly disposed thereto through which said particles are ejected from said chamber outlet to be impinged against such surfaces and rebounded by deflection into said second chamber, means providing a return passage for said particles from said second to said first chamber, rotary means within saidrfirst chamber to eject said particles therefrom and simultaneously to recycle rebounded particles thereto from said second chamber through said passage, a plurality of bafiles in said second chamber extending transversely of its walls to collect'and maintain: the rebounded particles in the bottom thereof, a bafiie of said plurality comprising a transverse partition extending between side walls of said second chamber but spaced from the bottom thereof to provide an inner and an outer passage for directing rebounding particles variously deflected to said bottom when said outlet-inlet ope ing is held at a substantially angular position from the horizontal and a hinged baffie on the inner side of said partition intermediate its ends whereby to close off said inner passage when said outlet-inlet opening is tilted to a substantially horizontal position.

8. In a device of the character described, for use in treating plane, curved and irregular surfaces by impinging thereagainst and rebounding therefrom abrasive particles traveling at high velocity and continuously recovering the rebounding particles to recycle the same, comprising a self-contained unit, including a housing having a first chamber. with an outlet for expelling said particles therefrom, a second chamber connected to said first chamber and having an inlet angularly disposed adjacent said outlet for recovering said particles therein, an outlet-inlet opening in said housing in common communication with the outlet and inlet of said chambers and angularly disposed thereto through which said particles are ejected from said chamber outlet to be impinged against such surfaces and rebounded by deflection into said second chamber, conduit means providing a return passage for said particles from said second to said first chamber, a disk, a plurality of radially disposed sweeps mounted on said disk, means for rotating said disk to propel said particles therefrom and simultaneously to create an airflow to remove particles from said second chamber toward said passage, said dislcbeing wholly disposed Within said housing, and a removable protective cover formed to receivesaid sweeps and to protect the same in operation against abrasive particles.

References Cited in the file of this patent UNITED STATES PATENTS 2,341,559 Keefer Feb. 15, 1944 2,455,514 Mead Dec. 7, 1948 2,487,366 Penno Nov. 8, 1949 2,723,498 Hastrup Nov. 15, 1955 2,770,924 1956 Mead et a1. Nov. 20,

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Referenced by
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US3262228 *Jul 31, 1962Jul 26, 1966Mercantile Marine EngineeringBlast cleaning apparatus
US3380196 *Jan 19, 1965Apr 30, 1968Promecan Sisson LehmannSurface treating apparatus
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Classifications
U.S. Classification451/87, 451/96, 451/354
International ClassificationB24C5/06, D06C29/00, B24C3/06
Cooperative ClassificationB24C3/065, D06C2700/29, D06C29/00, D10B2501/044, B24C5/06
European ClassificationD06C29/00, B24C3/06C, B24C5/06