US1774703A - Sand-blast device - Google Patents

Description

Patented Sept. 2, 1930 1 UNITED STATES PATENT- OFFICE.

CHARLES A. DREISBACH, on NEW HAVEN, CONNECTICUT I SAND-BLAST DEVIC Application filed April 6, 1927; Serial -No."181,402

My invention relates to a sand blast-device soft packing 4 through which "-a stripof-mafor cleaning long strips, wires or rods, and terial '5 under treatment-is adaptedto=pass,- the same is adapted to accomplish the same this packing vserving to prevent back flow purpose as the device shown in the patent to of the air and sand. There is a 'central'hub VVashburn No. 1,400,585. In the present de- 6 projecting inwardly from theend wall 2 5; vice a strip, bar, or rod of material, usually and this has a central bore-7 somewhat larger: metal, which is to be cleaned by a sandblast, in diameter than the largest strip of materialis passed in a long or continuous length to be treated in the device. In addition, the through the sand blast portion of the device shell member 1 has a tubular projection8 10 so that a blast of sand and air at high veto which the air hose 9 is adapted to be con--60 locity is projected against the surface of the nected for directing the current ofcommember which is being cleaned, and during pressed air into the chamber-1O formed with the operation the wire, rod or other member in the casing memberl. It is understood under treatment passes continuously through thatthepipe or tube 9 is connected with a the sand blast nozzle in order that the treatsuitable reservoir of an air compressing ma: c5- ment may be carried out as a continuous opchine of any well known construction, the eration on a very long strip of material. One aircompressor being omitted from the drawobject of the present invention is to improve ings as it forms no part of the present in'-- the construction and assembly of the sand vention and such devicesare-well known in so blast nozzle and its associated parts in order the art. The casing member 1 alsoincludes 70 that the parts may be made in the simplest a top wall 11, a bottom wall 12 and end walls: and most economical manner and in order 2, 13 all serving to define the air chamber that the parts may be assembled and disas-' 10 which surrounds thetubular extension 6 sembled quickly. Another advantageis that through which the stripof material passes.

the parts of the sand blast nozzle which are In the present construction the members 75 subject to rapid wear may be removed and which form the sand blast nozzlebr -which' replaced quickly and at a very low cost. control the form and direction of. the blast Another advantage is that the portion of are adapted to be assembled with the casing the nozzle which determines the shape and member 1 and then this member'with such 3U position of the blast of sand may be shaped parts assembled may be assembled in conin various ways to suit the particular cross neat-ion With a second casing member ll section of the material under treatment. which forms the sand chamber nd Which Other advantages will appear in the followcarries the discharge nozzle.

ing detailed description of my invention. The bore Of the tubular extension 6 is In the drawing forming part of this apthreaded as shown at 22, to receive a COI'Ie-'s5 plication, spondlngly threaded shank or extension 51- Figure 1 is a longitudinal, sectional view formed on the rear end of the'interior nozzle through the center of a sand blast device member 17 the details of whichareshown' in embodying my invention, Figure The remainder of this member .2) Figure 2 is an end elevation thereof taken: 17 is provided with a polygonal outer-sur-ec from the left hand end of Figure 1, 7 face which in the particular formillustrated Figure 3 is an elevation of the discharge in the drawing is substantially rectangular, nozzle detached fromthe casing, and havingfour faces 18 With the 'corners're Figure 4 is a sectional view taken on the moved on thearc of a circle,-asshown at 19 4. line 4i4 of Figure 1. in Figure l, to'conform with interior diameus The present device includes a frame or ter of the second or outer noz'zlemember. casing made principally in two assembled The-forward or discharge portion of this'nozsections. One of these sections shown at 1 zle' member 17 as shown at 20 is preferably has a rear wall 2 provided with a rear socket frustro conical in shape, tapering from the so or opening 3 to receive a compressible or ends oftheflat faces 18 This nozzle member 45515 also has a. bore 21 extending longitudinally through it, of slightly larger diameter than the largest strip of material which is to be subjected to the sand blast action. The nozzle member 17 as above stated, is threaded into the tubular extension 6 and it extends forwardly through the tubular member 8 which is part of the casing member 1; and in the form of the invention shown herein the interior opening or bore of this member 8 is of circular shape to be concentric with the arc of the corners 19 of the nozzle member 17. The outer member of the nozzle proper comprises a circular member 24 having a tubular extension 25 which is provided with an exterior thread which screws into the threaded end 26 of the casing extension 8; and it also has a flange 27 on its exterior which abuts against the'forward end of this extension 8 and this joint may be packed with a suitable washer if desired. The nozzle member 24 is provided with a central bore 28 formed on the arc corresponding with the several rounded corners 19 of the inner nozzle member 17 so that the corners of this latter member may fit snugly against the bore 28. The spaces 50 are formed between the flat faces 18 of the member 17 and the bore 28 around the path of the rod 5. From the cylindrical bore 28 of the member 24 the opening decreases or tapers, as shown at 29 toward the discharge end of the nozzle and the diameter along this tapered portion is somewhat larger than the exterior diameter of the frustro conical portion 20 of the inner nozzle member; so that there is formed between these two parts an annular space 30 surrounding the path of the strip of material under treatment.

The other member of the casing comprises the tubular member 14 the rear end of which is closely fitted to the exterior of the tubular extension 8 of the first casing member and it abuts against the shoulder 31 and, if desired, a suitable washer may be interposed at this point to prevent leakage. The casing member 14 is provided with a top opening 32 into which the lower end of a hopper 33 feeds the sand into the sand chamber 34. This casing member forms the compartment 34 which constitutes the sand chamber of the nozzle and it surrounds the discharge end of the nozzle member 24.

The right hand end of this casing member 14 in Figure 1 is provided with a frusto-conical bore 35 extending from the front of the sand chamber to the extreme end of the easing member 14 into which the discharge nozzle 36 is adapted to fit. The discharge nozzle is shown at 36 and it consists of a tubular portion 37 which flares out in frustro conical shape at the left hand end 88 the periphery of this frustro conical portion being adapted to fit snugly into the frustro conical opening of the casing member 14 with the cylindrical portion of the discharge nozzle projecting beyond the end of the casing member. This discharge nozzle has a frustro conical bore 39 on the left hand end which merges with a cylindrical bore 40 through the center of whii'rh the piece of material under treatment adapted to travel. In order to hold the discharge nozzle tightly in place and to prevent leakage of sand between it and the casing member 14, I have proviued a yoke 41 which is adapted to be inserted through the top opening 32 where the hopper is attached to the casing member 14 and this yoke, which is wedge shape, or tapered, is adapted to be forced between the ends of this discharge nozzle 87 and the lugs 42 cast on the interior of the casing member 14 in order to force the discharge nozzle into tight engagement with the frustro conical bore 35 in order that sand will not pass between the discharge nozzle and the casing member 14.

I have not shown the details of the hopper device as any type of hopper may be employed with this device, but preferably the type of hopper shown in the said Washburn Patent No. 1,400,585.

In the operation of the device the strip of material 5 which is to be subjected to the ac tion of the sand blast is passed through the soft packing 4; through the bore of the nozzle member 17, passing through the sand chamber 34 and thence through the discharge nozzle 37; and when the machine is in operation this strip of material may be fed continuously through the apparatus in order that the operation may be carried on as a continuous one. Sand is continually introduced into the sand chamber 34 from the hopper and compressed air is admitted through the pipe 9 into the air chamber 10. The compressed air passes from the air chamber 10 through the bore of the extension 8 and thence through the spaces formed between the polygonal outer surface of the outer nozzle member 24. In the form of the device shown herein a stream of air will be divided into four parts corresponding with the four spaces 50 all disposed concentrically around the axis of the travelling rod of metal 5. From these spaces the compressed air enters the annular space 30 between the frustro conical end 20 of the inner nozzle member and the frustro conical bore 29 of the outer nozzle member, so that the air current is deflected around the entire surface of the rod 5; and as this air passes into the sand chamber, it takes up the sand and projects it at hi h velocity against the surface of the rod 5. The blast of sand is forced at high velocity through the annular space formed between the travelling rod 5 and the bore of the discharge nozzle 37. This latter nozzle is preferably of conside'able length as shown in the drawing, so that as the blast of sand is travelling through this annular spa *c it is frictionally acting upon the entire surface of the travelling rod 5 and it serves to remove any scale or corrosion which may be present along the rod, so that the rod emerges from the end of the discharge nozzle in clean condition. The action is more nearly a scouring action as the device does not depend entirely on the impact of the sand against the surface of the rod 5.

It will be apparent that a blast of sand entirely surrounding the travelling rod may be projected against the rod and that the action of the blast may be uniform all around the same, whereas when individual jets or nozzles are employed, as in the Washburn patent, the velocity of the sand blast is more or less localized at difierent points on the travelling rod. With the present type of nozzle the jet or blast may be of annular form directed at a constant angle against the periphery of the travelling rod. Furthermore, the nozzle is of very simple and inexpensive construction as the inner and outer members 17, 24: may be easily and inexpensively made. If a rod other than round is to be treated in the device, it is very easy to remove the nozzle members 17, 24 and substitute other nozzle members having the space shaped to conform with the shape of the rod under treatment. For instance, if a rod of oblong cross section is to be treated, thenthe annular space 30 which controls the deflection of the blast against the rod may be similarly shaped in order that the blast will act uniformly on the surface of the rod. Likewise an oval or any other shaped rod may be uniformly treated by simply supplying the nozzle members in which the annular space 30 is shaped to correspond with the periphery of the particular shaped rod.

In assembling the device the inner nozzle member 17 is screwed into the tubular extension 6 of the casing member 1 and then the outer nozzle member 2a is screwed into the tubular portion 8 of the same casing member 1; and this will bring the nozzle members into the proper operative relation to form the air passages as herein described. The discharge nozzle is introduced into the bore 30 of the casing member 1a and the wedge yoke 4-1 is then inserted to lock the discharge nozzle in place and after that the two casing members are assembled in the position shown in Figure 1.

Having described my invention, what I claim is:

l. A sanding device adapted to operate upon a long strip of material passing therethrough, comprising a casing forming an air chamber and a sand chamber following sail air chamber in the direction of travel of the strip, a tubular member detachably mounted inside said air chamber and projecting into said sand chamber and having a bore through which said strip travels, means for feeding air to said air chamber whereby said air surrounds said tubular member, a second tubular member mounted in said casing to be detachable separately from said first tubular member and disposed in said sand chamber to surround a portion of said first tubular member and co-operating therewith to form an intervening passageway to conduct air from said air chamber into said sand chamber and to project the air and sand against the traveling strip.

2. A sanding device adapted to operate upon a long strip of material passing therethrough, comprising a casing forming an air chamber and a sand chamber following said air chamber in the direction of travel of said strip, said casing having a tubular support in said air chamber and a tubular support opening into said sand chamber, a tubular member detachably mounted in said first tubular support to lie inside said air chamber and to project into said sand chamber, and having a bore through which said strip travels, means for feeding air to said air chamber whereby said air surrounds said tubular member, a second tubular member detachably mounted in said second tubular support and disposed in said sand chamber to surround a portion of said first tubular member and co-operating therewith to form an intervening passageway to conduct air from said air chamber into said sand chamber and to project the air and sand against the traveling strip.

3. A sanding device adapted to operate upon a long strip of material passing therethrough, comprising a casing forming an air chamber and a sand chamber following said air chamber in the direction of travel of said strip, a tubular member detachably mounted in said air chamber and projecting into said sand chamber and having a bore through which said strip travels, means for feeding air to said air chamber, a second tubular member detachably mounted in said casing and surrounding said first tubular member and cooperating therewith to form an annular space surrounding said strip, said tubular members co-operating to conduct air from said air chamber into said sand chamber and to project the air and sand against the traveling strip.

4. A sanding device adapted to operate upon a long strip of material passing therethrough, comprising a casing forming an air chamber and a sand chamber following said air chamber in the direction of travel of said strip, said casing having a tubular support in said air chamber and a tubular support opening into said sand chamber, a tubular member threaded into said first tubular support to lie in said air chamber and to project into said sand chamber, and having a bore through which said strip travels, means for feeding air into said air chamber, a second tubular member threaded into said second.

its

tubular support and disposed in said sand chamber to surround a portion of said first tubular member and co-operating therewith to form an intervening passageway to con duct air from said air chamber into said sand chamber and to project the air and sand against the traveling strip.

Signed the 25th day of March, 1927, at New York, county of New York, State of New York.

CHARLES A. DREISBACH.

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