US3753318A - Dustless sand blaster - Google Patents

Dustless sand blaster Download PDF

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Publication number
US3753318A
US3753318A US00300462A US3753318DA US3753318A US 3753318 A US3753318 A US 3753318A US 00300462 A US00300462 A US 00300462A US 3753318D A US3753318D A US 3753318DA US 3753318 A US3753318 A US 3753318A
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United States
Prior art keywords
chamber
skirt
combination
grit
frame
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00300462A
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English (en)
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L Eskijian
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/06—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable
    • B24C3/065—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other movable; portable with suction means for the abrasive and the waste material

Definitions

  • ABSTRACT g equipment with a work-engaging nozzle inlet.
  • the chamber is posiparallel to a work surface by multiaster supports and is connected to a hich may include a venturi to aid in ced chamber pressure.
  • Sand or grit blastin chamber having a tioned and moved ple spring-biased c suction device, w
  • This invention relates generally to sand orgrit blasting blasting equipment, and more particularlyrconcerns a dustless, sand blasting vacuum system characterized by numerous advantages in construction, mode of operation and results.
  • Air pollution control'laws and agencies-and occupational health and safety legislation .are becoming invcreasingly strict in their requirements as regards dust emission from grit-blasting equipment and-dust concentration in the.operatorsenvironment. Great expense is,
  • the invention is embodied in grit particle blasting equipment that includes:
  • a chamber having an inlet to receive a grit blasting nozzle, a forward end of the chamber being open for approaching a work surface toward which the nozzle is directed,
  • a flexible skirt extending about the open forward end of the chamber and projecting forwardly of the chamber to extend adjacent said work surface for cnfining grit particles against escape outwardly of the skirt, the skirt containing slits to pass air streams drawn into the chamber by said reduced pressure conditions, and
  • an openwork frame carried by the chamber to project forwardly and limit inward deflection of the skirt so that the skirt may remain adjacent said surface during chamber movement parallel to said surface.
  • the frame may advantageously include wiring spring-urged outwardly against the chamber inner surface for frictional retention, and a metallic screen projects from the chamber and at the inner side of the skirt to limit its inward flexing, except for the end portion of the skirt. lnwardly of the latter multiple supports in the form of casters may be carried by the frame to yieldably resist deflection toward the chamber, so as to accommodate to unevenness at the work surface over which the apparatus is traveled while remaining held against same by vacuum suction conditions created within the chamber.
  • limited angular deflection of the nozzle within the chamber may be accommodated by a swivel or flexible joint connection to the chamber; and the air, grit and removed particle withdrawal means may include a venturi to the throat of which auxiliary air is supplied; and the skirt may incorporate flap controlled windows throughwhich enough air may be delivered to ensure entrainment of the grit for removal, as described, and proper pressure balance in the chamber.
  • the equipment enables sand blasting in a dust free menner by means of mobile and lightweight apparatus capable of use with existing auxiliary equipment at the job site; and filtration system can be used from a simple attachment at the end of the exhaust hose, to a bag house collection system; the nozzle distance is adjustable; the exhaust system is adjustable so as not to short circuit the blasted sand prior to its striking the work surface; there are no moving parts or hazardous electrical wiring; any type abrasive particulate can be used, and health and safety requirements are fully met.
  • FIG. 1 is a vertical section taken through one form of apparatus embodying the invention, in use;
  • FIG. 2 is a reduced size and view of the FIG. 1 apparatus
  • FIG. 3 is a section taken on lines 33 of FIG. 1;
  • FIG. 4 is a view like FIG. I, but showing variable retraction of support wheels
  • FIG. 5 is a section showing details of wire frame structure in the apparatus
  • FIG. 6 is a perspective showing of the wire frame structure seen in FIG. 5;
  • FIG. 7 is an end view showing overlapping construction of the wire frame.
  • FIG. 8 is an elevation showing a venturi device for reducing pressure in the interior of the FIG. 1 apparatus.
  • a chamber 10 is provided to have an inlet 11 to receive a grit (as for example sand or otherabrasive particulate) blasting nozzle 12, the forward end of the chamber being open for approaching a work surface as seen at 100.
  • the chamber itself may be generally cylindrical in shape and may consist of light weight metal.
  • the chamber diameter may be between 10 and 14 inches, and its length L may be about the same.
  • the chamber may be lined with a thin elastomer sheet 13, to withstand sand erosion of the chamber metal.
  • the inlet 11 may be defined by a tubular fitting l4 suitably attached to or carried by the chamber rear end wall 15, and a handle 16 may be attached at 17 to the fitting 14, to be grasped manually for maneuvering the chamber toward and away from, as well as parallel to, the work surface such as a wall.
  • the nozzle 12 is closely receivable into the fitting 14, and engages a stop IS on the latter to limit nozzle projection into the chamber interior 19.
  • the nozzle tip 12a may be located around 12 inches from the work surface 100, to produce a typically conical grit blast pattern indicated generally at 20.
  • fitting 14 may comprise a swivel or flexible joint limiting tilting of the nozzle relative to the chamber 10 to permit selective directing of the blast pattern 20 up, down or laterally relative to the work surface.
  • the nozzle may comprise Model CFSDX, a product of Clemco-Clementina, Ltd., of San Francisco, California.
  • Means is provided to withdraw air and particulate from the chamber interior and creating reduced pressure conditions therein, so that removed particulate and grit are prevented from escape to the open exterior of the chamber.
  • Such means may comprise an outlet tubular fitting 22 attached to the chamber side, as shown, a flexible hose 23 attached to the fitting leading to a suitable filter 24.
  • a pump or blower 25 may draw air from the filter, if desired; alternatively, a venturi 26 as seen in FIG. 8 may be installed in the fitting 22 with its throat 26a in series communication with the outlet 27 passage formed by the fitting 22. Air from a pump or blower 28 supplied at 29 to the venturi header ring 30 escapes via annular outlet 31 into the throat in a downstream direction to draw air and particulate streams 32 through the venturi.
  • a pump or blower 28 supplied at 29 to the venturi header ring 30 escapes via annular outlet 31 into the throat in a downstream direction to draw air and particulate streams 32 through the venturi.
  • about 50 cubic feet per minute of air supplied via ring 30 to the venturi throat serves to draw 100 to 150 cfm of air flow from the blasting chamber interior, plus another 300 400 cfm from the slits in the rubber skirt and the air intake vents in the skirt.
  • An open work frame is carried by the chamber 10 to project forwardly at the inner side of a flexible skirt 33 that extends about the open forward end of the chamber.
  • One usually advantageous frame 34 includes heavy wiring removably received into the chamber via its open end 10a and spring urged outwardly against the chamber inner surface.
  • Such frame wiring may include two steel rings 35 and 36 each having overlapping free ends, and four forwardly elongated heavy wire legs 37, as seen in FIGS. -7.
  • the latter supports are equidistantly spaced about the chamber central axis, and each is welded or otherwise attached to the two rings 35 and 36.
  • the frame may also include a heavy metallic cylindrical screen 38 with sprially overlapping free ends, the screen carried by and at the outside of legs 37 and projecting from a point 39 within the chamber to a location 40 at a short distance (say about 1 inch) from the work surface 100.
  • the screen limits inward, suction inducted deflection of the flexible skirt 33, and is easily removable from the chamber along with the heavy wiring 34, for maintenance purposes.
  • Such supports are carried by the chamber 10, as via the legs 37, to engage the work surface 100 for movement parallel thereto and to limit approach of the chamber toward that surface, the skirt 33 accordingly functioning to seal off the gap between the chamber and surface 100 except for allowing limited ingress of air as will be seen.
  • Such supports may advantageously take the form of casters 40 carried by the legs 37, with springs 41 yieldably resisting retraction of the casters in a rightward direction relative to the legs. If desired, the springs may be attached to the legs and may be coiled to receive the caster shafts.
  • the chamber may be universally tilted relative to the wall, to limited extent, during the blasting operation and during chamber movement parallel to the wall, to accommodate itself to surface irregularities, while the skirt remains in semisealing relation to the gap between the wall and the chamber 10.
  • FIG. 4 shows retraction of horizontal caster wheels as might occur during travel over an obstruction 99.
  • the referenced skirt 33 may consist of elastomer and be wrapped spirally about the chamber forward end portion 10b, with attachment thereto. Further, the skirt extends forwardly to engage at 43 the work surface 100, and it contains longitudinal slits 44 to allow or control limited ingress of air to the chamber interior and directly about the work surface zone subject to .blasting.
  • the spiral wrapping of the skirt may be such that two layer of skirt material extend about that zone, with the slits in adjacent layers in non-registered relation.
  • the screen 38 limits inward deflection of the skirt except for the curtain sections between the slits adjacent the work surface, those sections deflecting inwardly to allow additional air flow radially inwardly adjacent the blast zone to balance the exhaust systems demands. Such deflection is limited by the resiliency of the elastomer to prevent outward escape of particulate.
  • FIGS. 3 and 5 show the provision of window flap valves 60 carried by the skirt 33 and adapted to swing inwardly as viewed in FIG. 5 to admit air inwardly through windows 61 in the skirt, to maintain a steady flow to the exhaust system. If the pressure in the chamber interior ever increases, the flap valves will swing against the skirt to close the windows, preventing egress of grit particles.
  • ln grit particle blasting equipment comprising a. a chamber having an inlet to receive a grit blasting nozzle, a forward end of the chamber being open for approaching a work surface toward which the nozzle is directed,
  • a flexible skirt extending about the open forward end of the chamber and projecting forwardly of the chamber to extend adjacent said work surface for confining grit particles against escape outwardly of the skirt, the skirt containing slits to pass air streams drawn into the chamber by said reduced pressure conditions, and
  • an openwork frame carried by the chamber to project forwardly and limit inward deflection of the skirt so that the skirt may remain adjacent said surface during chamber movement parallel to said surface.
  • said multiple supports comprise casters carried by the frame at the forward end thereof and spaced about an axis defined by the frame cylinder, and springs resisting caster deflection toward the chamber.
  • said air and grit withdrawal means comprises an outlet at the side of the chamber, and a venturi having a throat in comwardly extending legs attached thereto, the legs carrying said casters.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US00300462A 1972-10-25 1972-10-25 Dustless sand blaster Expired - Lifetime US3753318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30046272A 1972-10-25 1972-10-25

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JP (1) JPS4976194A (forum.php)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160353A1 (en) * 1984-03-05 1985-11-06 Inventive Machine Corporation Pressurized abrasive cleaning device
EP0396815A1 (de) * 1989-05-11 1990-11-14 Helmut Fastje Absaughaube für Fassadenreinigung
US5795626A (en) * 1995-04-28 1998-08-18 Innovative Technology Inc. Coating or ablation applicator with a debris recovery attachment
FR2949723A1 (fr) * 2009-09-09 2011-03-11 Bioboat Unite de decapage a sec des coques de bateaux
US8771041B2 (en) 2011-06-30 2014-07-08 Theodosios Kountotsis Scraper and sandblaster assembly and methods of use
US8820131B2 (en) 2009-12-18 2014-09-02 Mitsubishi Heavy Industries, Ltd. Shot peening apparatus
CN105382702A (zh) * 2015-12-08 2016-03-09 无锡江南电缆有限公司 一种喷砂装置
CN106272112A (zh) * 2016-09-06 2017-01-04 安徽理工大学 一种前混合磨料射流外置喷射仪器防护装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152064A (ja) * 1983-02-16 1984-08-30 Mitsui Eng & Shipbuild Co Ltd サンドブラスト防塵装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455514A (en) * 1945-08-02 1948-12-07 William H Mead Surface treating method and apparatus
US2494773A (en) * 1948-11-13 1950-01-17 Mead Corp Surface treating apparatus
US2766557A (en) * 1954-09-27 1956-10-16 Gerald M Pollard Sand blasting apparatus
US2770924A (en) * 1954-04-01 1956-11-20 William H Mead Instant stop and start blasting device
US3566543A (en) * 1968-02-06 1971-03-02 Wheelabrator Corp Machine for treatment of large vertical surfaces

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455514A (en) * 1945-08-02 1948-12-07 William H Mead Surface treating method and apparatus
US2494773A (en) * 1948-11-13 1950-01-17 Mead Corp Surface treating apparatus
US2770924A (en) * 1954-04-01 1956-11-20 William H Mead Instant stop and start blasting device
US2766557A (en) * 1954-09-27 1956-10-16 Gerald M Pollard Sand blasting apparatus
US3566543A (en) * 1968-02-06 1971-03-02 Wheelabrator Corp Machine for treatment of large vertical surfaces

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160353A1 (en) * 1984-03-05 1985-11-06 Inventive Machine Corporation Pressurized abrasive cleaning device
EP0396815A1 (de) * 1989-05-11 1990-11-14 Helmut Fastje Absaughaube für Fassadenreinigung
US5795626A (en) * 1995-04-28 1998-08-18 Innovative Technology Inc. Coating or ablation applicator with a debris recovery attachment
FR2949723A1 (fr) * 2009-09-09 2011-03-11 Bioboat Unite de decapage a sec des coques de bateaux
US8820131B2 (en) 2009-12-18 2014-09-02 Mitsubishi Heavy Industries, Ltd. Shot peening apparatus
US8771041B2 (en) 2011-06-30 2014-07-08 Theodosios Kountotsis Scraper and sandblaster assembly and methods of use
CN105382702A (zh) * 2015-12-08 2016-03-09 无锡江南电缆有限公司 一种喷砂装置
CN106272112A (zh) * 2016-09-06 2017-01-04 安徽理工大学 一种前混合磨料射流外置喷射仪器防护装置
CN106272112B (zh) * 2016-09-06 2018-03-27 安徽理工大学 一种前混合磨料射流外置喷射仪器防护装置

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Publication number Publication date
JPS4976194A (forum.php) 1974-07-23

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