WO1983000315A1 - Apparatus for propelling abrasive medium - Google Patents

Apparatus for propelling abrasive medium Download PDF

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Publication number
WO1983000315A1
WO1983000315A1 PCT/GB1982/000217 GB8200217W WO8300315A1 WO 1983000315 A1 WO1983000315 A1 WO 1983000315A1 GB 8200217 W GB8200217 W GB 8200217W WO 8300315 A1 WO8300315 A1 WO 8300315A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
outlet
medium
abrasive medium
propellant
Prior art date
Application number
PCT/GB1982/000217
Other languages
French (fr)
Inventor
Techniques Impact (Ironville) Limited
Original Assignee
Edgar, Paul
Taylor, Dan
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Edgar, Paul, Taylor, Dan filed Critical Edgar, Paul
Publication of WO1983000315A1 publication Critical patent/WO1983000315A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/60—Contents and propellant separated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials

Definitions

  • This invention relates to apparatus for propelling a medium, especially an abrasive medium and in particular is concerned with hand held apparatus operable by pressure.
  • apparatus for propelling an abrasive medium said apparatus having a first cavity for retaining a self-contained supply of the abrasive medium, and a second cavity for retaining a self-contained propellant medium, arid outlet means which comprises an abrasion resistant material and through which abrasive medium can be expelled from the apparatus, means being provided to enable the abrasive medium to be propelled through the outlet means by virtue of a manually applied pressure.
  • the apparatus includes an outlet for said first cavity and an outlet for said second cavity the first and second cavity outlets connecting with one another whereby, when the second cavity outlet is open, the propellant medium can pass therethrough and cause abrasive medium to flow through said first cavity outlet and be dispensed through the outlet means.
  • the apparatus includes an outlet for said first cavity and an outlet for said second cavity, said first cavity including means enabling mixing of the abrasive medium with the propellant medium when the latter flows through the second cavity outlet, whereby the mixture flows through said first cavity outlet to the outlet means.
  • the second cavity outlet includes a valve for controlling passage of the propellant medium from the second ccvity, whereby there is no passage cf abrasive medium through the control valve.
  • the outlet means nay be provided with a venturi and may be formed of a base material which is chromium plated so as to be abrasion resistant.
  • the base material may be a hard plastics material such as nylon.
  • the second cavity outlet may comprise a tubular component which enters the second cavity at a location so designed that in any disposition of the apparatus, propellant medium in c liquid form will not enter the tubular component.
  • FIG. 1 is a vertical cross-section through a first embodiment of an apparatus according to the invention.
  • Fig. 2 is a vertical cross-section through a second embodiment of an apparatus according to the invention.
  • an apparatus in the form of an aerosol comprises a container 10, preferably cylindrical, having a concave lower end cap 12 and an upper end cap 14, an outer edge of the latter being crimped onto the container 10 and an inner edge defining a central aperture.
  • an arrangement comprising an inner container 16 preferably formed of a hard plastics material and defining a cavity 16a.
  • the container 16 terminates short of the lower end cap 12 and is closed at its lower end by a plug 13.
  • the cavity 10a surrounding the container 16 contains a liquid propellant medium as hereinafter described.
  • the container 10 is crimped together with a cover plate 20 onto the end cap 14.
  • a first tube 22 Slidably mounted on the cover plate 20 to extend therethrough is a first tube 22 extending within the container 16 close to the lower end thereof, and at its upper end communicating with an outlet device or nozzle 24 for the aerosol.
  • a further tube 26 extends through the cover plate 20 and has its upper end located in a valve 28, the latter also communicating with the nozzle 24.
  • the tube 26 is bent at its lower end to extend through the wall of the inner container 16 and communicate with the cavity of the container 10. The position of the lower end of the tirbe 26 is carefully chosen as hereinafter described.
  • the nozzle 24 at the outlet end thereof, downstream of the locations of communication with the tube 22 and the valve 23, is provided with, in the direction of flow, respective convergent and divergent parts forming a venturi.
  • a cap 30 is mounted on the upper end of the nozzle 24 whereby when pressure is manually applied to the cap 30, the nozzle 24 is moved downwardly with the tube 22, and simultaneously opens the valve 23, allowing communication between the cavity of the container 10 and the atmosphere.
  • a one-way aperture 32 is provided in the cover plate 20 to provide communication between the atmosphere and the cavity of the inner container 16.
  • the nozzle 24 is preferably formed of a hard plastics material such as nylon and, at least over the venturi section, is preferably chromium plated to provide an abrasion resistant lining.
  • the tube 22 may also be abrasion resistant if necessary.
  • a liquid propellant medium is introduced to the cavity of the container 10 to a level A.
  • the medium is such as to produce a vapour which is contained within the remainder of the cavity of the container 10.
  • the tube 26 has its lower end in communication with that part of the cavity of the container 10 containing the propellant vapour but, with the valve 28 closed, the vapour cannot pass to the nozzle 24.
  • the inner container 16 is filled with an abrasive medium such as sand or shot, different grades of which are washed and sieved prior to being introduced into the container 16.
  • the nozzle 24 with the valve 28 is biased to the closed position.
  • the propellant vapour passes to the nozzle 24 and creates a reduction in pressure as it passes the upper end of the tube 22, whereby to draw the abrasive medium through the tube 22 and propel the abrasive medium through the nozzle 24.
  • the valve 28 is subjected only to the passage of the vapour or, in an extreme condition, the propellant liquid, and is not therefore choked or fouled in any way by the passage of particulate material therethrough.
  • the aerosol does not have to dispense its total content at any one time, because the valve can be re-closed.
  • the tube 26 is so arranged that with the apparatus, in the horizontal position or in an inverted position, the amount of propellant liquid is such that it will still not reach the end of the tube 26 and pass therethrough.
  • the inner container 16 has a partition 34 extending thereacross towards the lower end, so as to define a chamber 36 between the partition 34 and the lower end cap 18.
  • the partition 34 has a pressure operated one-way valve 38 formed to be abrasion resistant, enabling communication between the cavity of the inner container 16 and the chamber 36.
  • An outlet tube 22a communicates at its upper end with an outlet device or nozzle 24a and extends through the inner container 16 to open at its lower end at the partition 34 into the chamber 36.
  • the valve 28 communicates between the tube 26 and a further tube 40 which extends back through the cover plate 20 and through the inner container 16, and opens through the partition 34 into the chamber 36.
  • the valve 28 In use, when the valve 28 opens, the propellant vapour passes through the tube 40 into the chamber 36 where the vapour entrains the abrasive medium and moves the abrasive medium through the tube 22a so as to propel the abrasive medium through the nozzle 24a.
  • the valve 28 is subjected only to the propellant vapour, or the liquid in an extreme condition, and is therefore not fouled by the passage of any pcrticulate material therethrough. It is to be appreciated that where an aerosol is to be used with very light duty abrasive medium, it may be convenient to provide an apparatus where the abrasive medium is mixed with a liquid propellant medium and/or transmitted through the control valve.
  • the aerosol is not restricted in use to abrasive medium but can advcntageously be used with other particulate material, for example powders, particularly where it is preferred that the material does not pass through the control valve.
  • the apparatus is designed to be hand held and effectively provides a mobile and easily used abrasive blasting device which has many advantageous uses.
  • the aerosol when filled with sand, can be used to etch security marks on car windows and the like and can also be used for cleaning of printed circuit boards.
  • the aerosol can be used to remove rust marks in any equipment.
  • the aerosol may be filled with cut wire shot and this is particularly suitable in peening of unaccessible areas of different forms of equipment.
  • venturi section of the nozzle may be adjustably position relative to the remaining section of the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Nozzles (AREA)

Abstract

An apparatus for propelling an abrasive medium comprises a hand-held container (10) having an inner container (16) defining a cavity (16a) for a self-contained supply of the abrasive medium and a cavity (10a) for a self-contained propellant medium. The cavity (10a) connects with an abrasion resistant nozzle (24) with a venturi through a control valve (28), and the cavity (16a) also connects with the nozzle (24). Pressure on a cap (30) opens the valve (28) and passage of the propellant causes abrasive to be drawn to the nozzle (24). No abrasive therefore contacts the valve (28).

Description

Apparatus for Propelling Abrasive Medium
This invention relates to apparatus for propelling a medium, especially an abrasive medium and in particular is concerned with hand held apparatus operable by
Figure imgf000003_0001
pressure.
In previously proposed hand held devices for propelling such as abrasive medium, it has been necessary to connect the devices to an external supply of a propellent medium. Design problems have prevented the development of hand held cpparatus of the aerosol type for use with such as abrasive medium because of the effect of the medium on components such as valves. According to the present invention there is provided apparatus for propelling an abrasive medium, said apparatus having a first cavity for retaining a self-contained supply of the abrasive medium, and a second cavity for retaining a self-contained propellant medium, arid outlet means which comprises an abrasion resistant material and through which abrasive medium can be expelled from the apparatus, means being provided to enable the abrasive medium to be propelled through the outlet means by virtue of a manually applied pressure.
Preferably the apparatus includes an outlet for said first cavity and an outlet for said second cavity the first and second cavity outlets connecting with one another whereby, when the second cavity outlet is open, the propellant medium can pass therethrough and cause abrasive medium to flow through said first cavity outlet and be dispensed through the outlet means.
Alternatively, the apparatus includes an outlet for said first cavity and an outlet for said second cavity, said first cavity including means enabling mixing of the abrasive medium with the propellant medium when the latter flows through the second cavity outlet, whereby the mixture flows through said first cavity outlet to the outlet means.
Preferably also the second cavity outlet includes a valve for controlling passage of the propellant medium from the second ccvity, whereby there is no passage cf abrasive medium through the control valve.
The outlet means nay be provided with a venturi and may be formed of a base material which is chromium plated so as to be abrasion resistant.
The base material may be a hard plastics material such as nylon.
The second cavity outlet may comprise a tubular component which enters the second cavity at a location so designed that in any disposition of the apparatus, propellant medium in c liquid form will not enter the tubular component.
Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:- Fig. 1 is a vertical cross-section through a first embodiment of an apparatus according to the invention; and
Fig. 2 is a vertical cross-section through a second embodiment of an apparatus according to the invention.
Referring to Fig. 1 of the drawings, an apparatus in the form of an aerosol comprises a container 10, preferably cylindrical, having a concave lower end cap 12 and an upper end cap 14, an outer edge of the latter being crimped onto the container 10 and an inner edge defining a central aperture.
Located through the central aperture in the end cap 14, to extend into the container 10, is an arrangement comprising an inner container 16 preferably formed of a hard plastics material and defining a cavity 16a. The container 16 terminates short of the lower end cap 12 and is closed at its lower end by a plug 13. The cavity 10a surrounding the container 16 contains a liquid propellant medium as hereinafter described. At the upper end, the container 10 is crimped together with a cover plate 20 onto the end cap 14. Slidably mounted on the cover plate 20 to extend therethrough is a first tube 22 extending within the container 16 close to the lower end thereof, and at its upper end communicating with an outlet device or nozzle 24 for the aerosol. A further tube 26 extends through the cover plate 20 and has its upper end located in a valve 28, the latter also communicating with the nozzle 24. The tube 26 is bent at its lower end to extend through the wall of the inner container 16 and communicate with the cavity of the container 10. The position of the lower end of the tirbe 26 is carefully chosen as hereinafter described.
The nozzle 24 at the outlet end thereof, downstream of the locations of communication with the tube 22 and the valve 23, is provided with, in the direction of flow, respective convergent and divergent parts forming a venturi. A cap 30 is mounted on the upper end of the nozzle 24 whereby when pressure is manually applied to the cap 30, the nozzle 24 is moved downwardly with the tube 22, and simultaneously opens the valve 23, allowing communication between the cavity of the container 10 and the atmosphere. A one-way aperture 32 is provided in the cover plate 20 to provide communication between the atmosphere and the cavity of the inner container 16. The nozzle 24 is preferably formed of a hard plastics material such as nylon and, at least over the venturi section, is preferably chromium plated to provide an abrasion resistant lining. The tube 22 may also be abrasion resistant if necessary.
A liquid propellant medium is introduced to the cavity of the container 10 to a level A. The medium is such as to produce a vapour which is contained within the remainder of the cavity of the container 10. The tube 26 has its lower end in communication with that part of the cavity of the container 10 containing the propellant vapour but, with the valve 28 closed, the vapour cannot pass to the nozzle 24. The inner container 16 is filled with an abrasive medium such as sand or shot, different grades of which are washed and sieved prior to being introduced into the container 16. The nozzle 24 with the valve 28 is biased to the closed position. When hand pressure is applied to the cap 30 to open the valve 28, the propellant vapour passes to the nozzle 24 and creates a reduction in pressure as it passes the upper end of the tube 22, whereby to draw the abrasive medium through the tube 22 and propel the abrasive medium through the nozzle 24. With this arrangement, the valve 28 is subjected only to the passage of the vapour or, in an extreme condition, the propellant liquid, and is not therefore choked or fouled in any way by the passage of particulate material therethrough. As the valve 28 is not fouled by any particulate material, it will be apparent that the aerosol does not have to dispense its total content at any one time, because the valve can be re-closed. The tube 26 is so arranged that with the apparatus, in the horizontal position or in an inverted position, the amount of propellant liquid is such that it will still not reach the end of the tube 26 and pass therethrough.
Referring to Fig. 2, similar components to the Fig. 1 embodiment have received the same reference numerals for ease of identification. In this embodiment, the inner container 16 has a partition 34 extending thereacross towards the lower end, so as to define a chamber 36 between the partition 34 and the lower end cap 18. The partition 34 has a pressure operated one-way valve 38 formed to be abrasion resistant, enabling communication between the cavity of the inner container 16 and the chamber 36. An outlet tube 22a communicates at its upper end with an outlet device or nozzle 24a and extends through the inner container 16 to open at its lower end at the partition 34 into the chamber 36. The valve 28 communicates between the tube 26 and a further tube 40 which extends back through the cover plate 20 and through the inner container 16, and opens through the partition 34 into the chamber 36.
In use, when the valve 28 opens, the propellant vapour passes through the tube 40 into the chamber 36 where the vapour entrains the abrasive medium and moves the abrasive medium through the tube 22a so as to propel the abrasive medium through the nozzle 24a. With this embodiment it will be appreciated that again the valve 28 is subjected only to the propellant vapour, or the liquid in an extreme condition, and is therefore not fouled by the passage of any pcrticulate material therethrough. It is to be appreciated that where an aerosol is to be used with very light duty abrasive medium, it may be convenient to provide an apparatus where the abrasive medium is mixed with a liquid propellant medium and/or transmitted through the control valve. It will also be appreciated that the aerosol is not restricted in use to abrasive medium but can advcntageously be used with other particulate material, for example powders, particularly where it is preferred that the material does not pass through the control valve. The apparatus is designed to be hand held and effectively provides a mobile and easily used abrasive blasting device which has many advantageous uses. For example, when filled with sand, the aerosol can be used to etch security marks on car windows and the like and can also be used for cleaning of printed circuit boards. When filled with steel or iron shot, the aerosol can be used to remove rust marks in any equipment. Also the aerosol may be filled with cut wire shot and this is particularly suitable in peening of unaccessible areas of different forms of equipment.
Various modifications may be made without departing from the invention. For example other types of aerosol equipment may be utilised with compressed air or other suitable propellant medium. The venturi section of the nozzle may be adjustably position relative to the remaining section of the nozzle.

Claims

Claims
1. Apparatus for propelling an abrasive medium characterised in that said apparatus has a first cavity (16a) for retaining a self-contained supply of the abrasive medium, and a second cavity (10a) for retaining a self-contained propellant medium, and outlet means (24, 24a) which comprises an abrasion resistant material and through which abrasive medium can be expelled from the apparatus, means (28, 30) being provided to enable the abrasive medium to be propelled through t.he outlet means (24, 24a) by virtue of a manually 'applied pressure.
2. Apparatus according to claim 1, characterised by an outlet (22) for said first cavity (16a) and an outlet (26) for said second cavity (10a), the first- and second cavity outlets connecting with one another whereby, when the second cavity outlet (26) is open, the propellant medium can pass therethrough and cause abrasive medium to flow through said first cavity outlet (22) and be dispensed through the outlet means (24).
3. Apparatus according to claim 1, characterised by an outlet (22a) for said first cavity (16a) and an outlet (26, 40) for said second cavity (10a), said first cavity (16c) including means (38) enabling mixing of the cbrasive medium with the propellant medium when the latter flows through the second cavity outlet (26, 40), whereby the mixture flows through said first cavity outlet (22a) to the outlet means.
4. Apparatus acco'rding to claim 2 or 3, characterised in that the first cavity outlet comprises a tubular
.component (22 or 22a) which is formed of an abrasion resistant material.
5. Apparatus according to any of claims 2 to 4, characterised in that the second cavity outlet (26) includes a valve (28) for controlling passage of the propellant medium from the second cavity (10c), whereby there is no passage of abrasive medium through the control valve (28).
6. Apparatus according to any of claims 2 to 5 characterised in that the second cavity outlet comprises a tubular component (26) which enters the second cavity (10a) at σ location so designed that in any disposition of the apparatus, propellant medium in a liquid form will not enter the tubular component (26).
7. Apparatus according to any of the preceding claims, characterised in that the outlet means (24, 24a ) is provided with a venturi.
8. Apparatus according to claim 7 characterised in that the venturi is formed in a section of the outlet means (24, 24a) which is adjustably positioned relative to the remaining section of the outlet means.
9. Apparatus according to any of the preceding claims, characterised in that the outlet means (24, 24a is formed of a base material which is chromium plated so as to be abrasio'n resistant.
10. Apparatus according to claim 9 characterised in that the base material is a hard plastics material.
PCT/GB1982/000217 1981-07-22 1982-07-20 Apparatus for propelling abrasive medium WO1983000315A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8122549 1981-07-22
GB8122549 1981-07-22
GB8200081 1982-01-04
GB8200081820104 1982-01-04

Publications (1)

Publication Number Publication Date
WO1983000315A1 true WO1983000315A1 (en) 1983-02-03

Family

ID=26280204

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1982/000217 WO1983000315A1 (en) 1981-07-22 1982-07-20 Apparatus for propelling abrasive medium

Country Status (3)

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EP (1) EP0083614A1 (en)
AU (1) AU8686182A (en)
WO (1) WO1983000315A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19851385B4 (en) * 1998-11-07 2006-07-06 Emt Werkzeug- Und Formenbau Gmbh Spraying or spraying device for liquids contained in pressureless disposable cans

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725684A (en) * 1955-01-27 1955-12-06 Dalton L Crowe Portable sand blaster
FR1336229A (en) * 1962-07-16 1963-08-30 Emulsified product dispenser
CH397320A (en) * 1962-05-22 1965-08-15 Aerosol Service Ag Powder atomizer
GB1108429A (en) * 1964-07-09 1968-04-03 Geigy Ag J R Improvements in or relating to dispensing apparatus
DE1916170A1 (en) * 1968-03-29 1969-10-23 Geigy Ag J R Powder distribution device with a valve operated by a pusher
DE1932213A1 (en) * 1968-06-25 1970-01-02 Norton Co Nozzle for sandblasting and abrasive blowers
US3704811A (en) * 1970-07-24 1972-12-05 Creative Ideas Inc Portable sandblaster
DE2754587A1 (en) * 1977-12-08 1979-06-13 Helmut Espeter Metering valve used on aerosol container - has separate channels for fluid and drive gas converging in outlet nozzle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725684A (en) * 1955-01-27 1955-12-06 Dalton L Crowe Portable sand blaster
CH397320A (en) * 1962-05-22 1965-08-15 Aerosol Service Ag Powder atomizer
FR1336229A (en) * 1962-07-16 1963-08-30 Emulsified product dispenser
GB1108429A (en) * 1964-07-09 1968-04-03 Geigy Ag J R Improvements in or relating to dispensing apparatus
DE1916170A1 (en) * 1968-03-29 1969-10-23 Geigy Ag J R Powder distribution device with a valve operated by a pusher
DE1932213A1 (en) * 1968-06-25 1970-01-02 Norton Co Nozzle for sandblasting and abrasive blowers
US3704811A (en) * 1970-07-24 1972-12-05 Creative Ideas Inc Portable sandblaster
DE2754587A1 (en) * 1977-12-08 1979-06-13 Helmut Espeter Metering valve used on aerosol container - has separate channels for fluid and drive gas converging in outlet nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19851385B4 (en) * 1998-11-07 2006-07-06 Emt Werkzeug- Und Formenbau Gmbh Spraying or spraying device for liquids contained in pressureless disposable cans

Also Published As

Publication number Publication date
EP0083614A1 (en) 1983-07-20
AU8686182A (en) 1983-03-17

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