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WO1989010850A1 - Outils de decapage - Google Patents

Outils de decapage Download PDF

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Publication number
WO1989010850A1
WO1989010850A1 PCT/GB1989/000467 GB8900467W WO8910850A1 WO 1989010850 A1 WO1989010850 A1 WO 1989010850A1 GB 8900467 W GB8900467 W GB 8900467W WO 8910850 A1 WO8910850 A1 WO 8910850A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
hot gas
nozzle
scraper
support means
Prior art date
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.)
Ceased
Application number
PCT/GB1989/000467
Other languages
English (en)
Inventor
Nicholas Maunder Ashdown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1989010850A1 publication Critical patent/WO1989010850A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B44D3/166—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning
    • B44D3/168—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning by electrically heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B44D3/162—Scrapers
    • B44D3/164—Scrapers comprising blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B44D3/166—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning

Definitions

  • the present invention relates to strippers and in particular to a stripper device suitable for use in removing thermally softenable material coatings such as oil-based paint, varnish and like coatings from wooden and other substrates.
  • Blow torches and hot air blowers are generally faster but also involve the risk of damage to the item itself as a result of localised overheating which can occur very easily, as well as the risk of damage to the surr ⁇ oundings due to the relatively unconfined nature of the flame or hot air flow and the difficulty of manipulating two separate pieces of equipment i.e. a scraper tool and a hot air blower, as well as the difficulty of providing a steady controlled heating of the surface being stripped at the same time as carrying out what is inevitably a discontinuous and irregular scraping action.
  • US 3,845,755 provides a gas- fuelled blowtorch device which provide a relatively thin sheet of flame from a hand held body which mounts a scaper blade in front of and above the heated area so that when the device is pulled backwards over a surface the scraper blade passes over the heated area to lift up the heat softened paint.
  • the blade is however set steeply so that paint scrapings tend to pile up on its surface and within a confined area around the blowtorch nozzle inside a protective heat shield resulting in the need for repeated stopping of scraping in order to clear the device of accumulated paint scrapings.
  • the heated zone is almost entirely obscured from the user by the heat shield and blade so that monitoring and control of the paint softening by the blowtorch is substantially prevented.
  • the relatively shallow (in the direction of stripping) heated zone moreover makes it difficult to achieve even heating and hence consistent scraping performance with a substantially clean removal of the paint layer in a single continuous sweep without either scorching or the need for multiple passes.
  • the positioning of the scraper blade in front of the blow torch nozzle has the further disadvantage of preventing heat softening of painted areas adjacent internal corners and, to some extent, scraping of such, in any event unsoftened, areas. A pulling scraping action may also be less convenient by operators used to the more normal pushing action of the scraper with conventional paint stripping.
  • DD-232,019A discloses a hot air gun adaptor with a scraper blade curved back substantially across the mouth of the nozzle in order to provide heating of the blade simultaneously with softening of the painted surface in order to reduce congealing of paint scrapings on the scraper blade.
  • the blade mounting however extends directly above the major part of the blade so that paint scrapings are cleared only very poorly from the blade and nozzle resulting in burning of the paint scrapings with resultant noxious fumes emission etc. and inter ⁇ ference with the hot air flow and the need for constant interruptions to scraping in order to remove the paint scrapings.
  • the adaptor is moreover configured so that the hot air gun has to be held vertically against the heated surface which is difficult and uncomfortable in practice.
  • CH-598,025 discloses a hot plate which directly contacts the surface to be stripped and has a steeply set blade at one end with a mounting extending above the whole of the blade. In this case there is an even greater tendency for paint scrapings to accummulate against the blade against the hot plate resulting in burning of the paint scrapings and the need for constant interruptions in order to clear the paint scrapings from the blade.
  • the present invention provides a stripper device comprising a hot gas gun. having a hot gas outlet nozzle and provided with a blade support means formed and arranged for supporting a scraper blade characterised in that said blade support means is formed and arranged for supporting said scraper blade at or in proximity to the rear end of a hot gas discharge zone of said hot gas outlet nozzle for scraping a heat softened paint layer from a painted surface, or the like, said blade and blade mounting means being formed and arranged so as to permit said blade to be engaged with said surface, in use of the device, at a shallow angle therewith, with said blade extending only a small height above . the surface and with a substantial clearance space above the blade extending substantially across the width of the blade between opposite sides thereof so as to facilitate easy and rapid passage of paint scrapings over the blade in use of the device.
  • the present invention provides a scraper attachment for hot gas gun having a hot gas outlet nozzle
  • which attachment comprises a nozzle piece provided with a blade support means and formed and arranged for engagement with said hot gas gun so as to support a scraper blade thereon characterised in that said blade support means is formed and arranged for supporting said scraper blade, in use of the attachment, at or in proximity to the rear end of a hot gas discharge zone of said hot gas gun, for scraping a softened paint layer from a painted surface, said blade and blade mounting means being formed and arranged so as to permit said blade to be engaged with said surface in use of the attachment, at a shallow angle therewith, with said blade extending only a small height above the surface and with a substantial clearance space above the blade extending substantially across the width of the blade between opposite sides thereof so as to facilitate easy and rapid passage of paint scrapings over the blade in use of the attachment.
  • said nozzle piece is formed and arranged so as to define a generally rectangular section hot gas discharge zone having a width generally similar to that of said scraper blade.
  • the said generally rectangular section has a substantial depth e.g. from 1 to 10 cms, advantageously from 1 to 5 cms.
  • the device and the attachment of the present invention it is possible to strip paint in a relatively simple andeconomic manner which is significantly faster than with previously known equipment.
  • the amount of heat and the position of its application can be more readily controlled with the scaper blade and its mounting helping to maintain a predetermined spacing and relation between the heater means and the painted surface being stripped, thereby reducing the risk of damage or injury to the item at the site of treatment and also away from the immediate site of treatment.
  • the present invention also extends to a hot gas gun having a hot gas outlet nozzle with a scraper attachment of the invention mounted thereon.
  • the present invention also provides a scraper attachment for a blow-torch comprising a nozzle-piece having secured thereto a blade-mounting means formed and arranged for supporting a scraper blade at or in proximity to a rear end of an extended area heat transfer zone substantially defined by said nozzle-piece, in use of said nozzle-piece on a blow-torch and in a predetermined relation to the blow torch, for scraping a softened paint layer from a painted surface.
  • Any suitable hot gas gun may be used in accordance with the present invention including hot air blowers where an air flow is passed across heated elements, most conveniently electrically heated elements, as well as blow torches where a fuel such as a gaseous or liquid hydrocarbon or other fluid fuel is burnt to produce a jet of hot gas.
  • hot air blowers where an air flow is passed across heated elements, most conveniently electrically heated elements, as well as blow torches where a fuel such as a gaseous or liquid hydrocarbon or other fluid fuel is burnt to produce a jet of hot gas.
  • nozzle and/or nozzle piece may be used in accordance with the present invention though preferably there is used a generally fan-shaped nozzle formed and arranged so as to provide a relatively wide hot gas discharge zone having a width of, for example, from 3 to 10 cms, preferably from 4 to 8 cms.
  • the scaper blade preferably is formed and arranged for engagement of the surface to be stripped, in use of the device or adaptor, at a shallow angle, generally less than 45°, preferably not more than 30°, e.g. from 10 to 30°, and having a height above said surface generally not more than 1 cm, preferably from 1 to 5 mm.
  • the blade mounting means is formed and arranged so that the blade is disposed on the hot gas outlet nozzle generally parallel to the direction in which the nozzle extends.
  • the clearance space above the blade is formed and arranged so as to be unobstructed across substantially the full wide of the scraper blade so as to permit substantially unobstructed and continuous passage of scrapings directly over the blade.
  • the height of the clearance gap may be varied within wide limits provided that it is substantially unobstructed to the rear.
  • the gap may have a width of for example from 3. to 20 mm, preferably from 4 to 8 mm.
  • Fig. 1 is a perspective view of a paint stripper device of the invention
  • Fig. 2 is a sectional elevation of a scraper attachment of the invention mounted on the hot gas outlet of a hot air blower;
  • Fig. 3 is an underside perspective view of the attachment of Fig. 2;
  • Fig. 4 is a general front perspective view of another form of stripper device of the invention.
  • Fig. 5 is a rear perspective view of a modified stripper device
  • Fig. 6 is a detail front elevation of the scraper blade of the stripper devices of Figs. 4 and 5; and stripper device of the invention.
  • Fig. 1 shows a paint stripper device 1 of the invention in use on a painted surface 2 for stripping a paint coating 3 therefrom.
  • the stripper device 1 comprises an electrically powered hot air blower 4 of generally known construction with a hot gas outlet nozzle 5 provided at its distal end 6 with a generally strip- form scraper blade 7 connected at either side 8 to the nozzle 5 via blade mounting means in the form of support members 9 so as to support the blade 7 below and substantially behind though in generally close proximity to the nozzle end 6.
  • the scraper blade 7 is disposed at a relatively shallow angle generally parallel to the direction in which the nozzle extends (see Fig.2) so that when the blower 4 is held by a user 10 at a convenient angle to the painted surface 2 for forward driving and pushing along it, the blade 7 can smoothly cut into a softened paint layer 11 immediately behind the advancing nozzle end 6 and separate it from the surface 2 being stripped in a more or less continuous strip 12 which passes substantially unobstructed directly over the blade 7. It will be appreciated that the engagement of the blade 7 with the surface 2 will facilitate maintenance of the nozzle end 6 at a generally constant spacing from the surface 2 thereby providing a more even heating of the surface 2.
  • a stripper device comprising a scraper attachment 13 mounted on the outlet nozzle 14 of a conventional hot air gun 15.
  • the attachment 13 includes a nozzle-piece 16 with a generaly tubular rear end 17 formed and arranged for. push-fit engagement with the distal end 18 of the hot gun outlet nozzle 14.
  • the nozzle piece rear end 17 may be suitably slotted 19 in generally known manner to provide a degree of resilient radial expandability therein for facilitating engagement and disengagement of the attachment 13 to hot gun outlet nozzle 14.
  • Fig. 3 the nozzle piece rear end 17 may be suitably slotted 19 in generally known manner to provide a degree of resilient radial expandability therein for facilitating engagement and disengagement of the attachment 13 to hot gun outlet nozzle 14.
  • the nozzle piece 16 has a generally fan-shaped outlet end portion 20 for providing a shallow and wide generally rectangular hot-gas discharge zone for heating a relatively wide area of the surface 2 as the stripper device 1 is advanced thereover thereby allowing fast stripping with a corresponding wide scraper blade 7.
  • the hot gun 4 has a handle portion 22 provided with an electric power supply lead 23 and a trigger switch control 24 for switching the hot gun 4 on and off as required.
  • the scraper attachment 13 and the blade 7 and blade mounting 8 of the stripper device 1 may be made of any suitably rigid and thermally resistant material. In general these will be of metal, for example stainless steel or other suitable steel.
  • Fig. 4 shows a scraper attachment 31 mounted on an electric hot air blower-type blowtorch outlet nozzle 32 by means of an adaptor nozzle means comprising a tubular section 33 which directs the hot air into a generally fan-shaped nozzle end 34 shaped and constructed with fins 35 such that the hot air will soften the paint to the width of the scraper blade 36.
  • the scraper blade 36 is mounted at opposite sides on spaced apart support legs 37 and 38, and is angled so-that it can smoothly cut into the softened paint layer and separate it from the item being stripped in a more or less continuous strip 45. Downstream i.e. to the rear of the scraper blade 36 are two supporting arms 39 and 40 (see also Fig.
  • FIG. 5 shows the scraper attachment of Fig. 4 conn ⁇ ected to the nozzle of a fuel- gas-type blowtorch 43.
  • Fig. 6 shows a scraper blade 36 which has a cutting edge 44 equal to or slightly narrower than the spacing between its support legs 37 and 38 so that a strip of paint 45 lifted by it can move freely between the legs 37, 38 thereby avoiding fouling of the attachment with the removed paint strip 45.
  • Fig. 7 is a partially cut-away side elevation of a further embodiment of a scraper attach ⁇ ment mounted on a blow torch (only part shown) .
  • the nozzle end 46 is extended into substantially direct proximity with the surface being stripped so as to more closely guide and confine the hot gas flow 47 onto the surface 2.
  • the downstream end 48 of the nozzle end 46 is generally coplanar with the scraper blade 36 and the bearer pads 41.
  • Suitable escape outlets 49 are provided at the front edge portion 50 of the nozzle end 46. These may conveniently be formed and arranged so that hot gas flow 47 is directed over the surface 2 being stripped immediately in front of the front edge 50. If desired deflector means 51 may be provided inside the nozzle end 46 in order to modify the hot gas flow 47 within the nozzle end 46.
  • the blade support and distal end of the hot gas outlet nozzle may also be varied e.g. the end may be cranked downwardly to displace the hot gas discharge zone rear ⁇ wardly and/or the blade support may be inclined forwardly as shown in Fig. 2 to displace the blade forwardly - but only to a limited extent to avoid possible fouling of the nozzle end by paint scrapings.
  • the blade may be formed by downward displacement of an underside distal end portion of the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

L'outil décrit (1) comprend un grattoir fixé à un pistolet à gaz chaud (4) comportant une buse de sortie de gaz chaud (5) et un organe de support de lame (9) conçu pour recevoir une lame de grattoir (7). Le support de lame est conçu pour recevoir la lame de grattoir (7) au niveau ou à proximité de l'extrémité postérieure d'une zone d'émission de gaz chaud du pistolet à gaz chaud, afin de gratter une couche de peinture ramollie (11) d'une surface peinte (2). La lame (7) et le support de lame (9) sont conçus pour permettre à la lame (7) d'entrer en contact avec la surface (2) à décaper, selon un angle peu prononcé par rapport à elle. La lame (7) s'étend seulement sur une petite distance au-dessus de la surface et un espace libre substantiel est prévu au-dessus de la lame et s'étend sensiblement sur toute la largeur de la lame (7) entre ses bords opposés (8), afin de faciliter un passage aisé et rapide sur la lame (7) de la peinture grattée (12) pendant l'utilisation de l'outil.
PCT/GB1989/000467 1988-05-04 1989-05-03 Outils de decapage Ceased WO1989010850A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8810490.6 1988-05-04
GB888810490A GB8810490D0 (en) 1988-05-04 1988-05-04 Stripper device

Publications (1)

Publication Number Publication Date
WO1989010850A1 true WO1989010850A1 (fr) 1989-11-16

Family

ID=10636309

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000467 Ceased WO1989010850A1 (fr) 1988-05-04 1989-05-03 Outils de decapage

Country Status (2)

Country Link
GB (1) GB8810490D0 (fr)
WO (1) WO1989010850A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2248207A (en) * 1990-09-14 1992-04-01 Eugene Camallas Divilly Device for facilitating removal of wallpaper, paint or the like
WO1993017882A1 (fr) * 1992-03-06 1993-09-16 Haakansson Goeran Procede et machine permettant de decaper entre autre de la peinture sur le bois de construction, et equipement de mise en ×uvre du procede
GB2297710A (en) * 1995-02-11 1996-08-14 Global Domestic Prod Ltd A heated scraper
WO2008036039A1 (fr) * 2006-09-22 2008-03-27 Krokoms Vägkrog Ab Grattoir à peinture
US20150231775A1 (en) * 2014-02-19 2015-08-20 The Boeing Company Adhesive Scoop

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2014597A1 (de) * 1970-03-26 1971-10-14 Pixberg O Werkzeug zum Entfernen von Lack bzw Farbschichten
US3845755A (en) * 1972-12-07 1974-11-05 L Aske T-manifold assembly for gas heated tool
CH598025A5 (en) * 1976-09-10 1978-04-28 Gravitation Sa Paint and varnish remover
DD232019A1 (de) * 1984-12-21 1986-01-15 Elektronische Bauelemente Veb Farbabloeser fuer warmluftgeraete

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2014597A1 (de) * 1970-03-26 1971-10-14 Pixberg O Werkzeug zum Entfernen von Lack bzw Farbschichten
US3845755A (en) * 1972-12-07 1974-11-05 L Aske T-manifold assembly for gas heated tool
CH598025A5 (en) * 1976-09-10 1978-04-28 Gravitation Sa Paint and varnish remover
DD232019A1 (de) * 1984-12-21 1986-01-15 Elektronische Bauelemente Veb Farbabloeser fuer warmluftgeraete

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2248207A (en) * 1990-09-14 1992-04-01 Eugene Camallas Divilly Device for facilitating removal of wallpaper, paint or the like
WO1993017882A1 (fr) * 1992-03-06 1993-09-16 Haakansson Goeran Procede et machine permettant de decaper entre autre de la peinture sur le bois de construction, et equipement de mise en ×uvre du procede
GB2297710A (en) * 1995-02-11 1996-08-14 Global Domestic Prod Ltd A heated scraper
GB2297710B (en) * 1995-02-11 1998-08-12 Global Domestic Prod Ltd A heated scraper
WO2008036039A1 (fr) * 2006-09-22 2008-03-27 Krokoms Vägkrog Ab Grattoir à peinture
JP2010504223A (ja) * 2006-09-22 2010-02-12 クローコムズ ベイグクロッグ アクチボラゲット 塗料削剥器
CN101516638B (zh) * 2006-09-22 2013-03-06 克鲁库姆韦格克罗格股份公司 刮漆刀
US8719988B2 (en) 2006-09-22 2014-05-13 Krokoms Vägkrog Aktiebolag Paintscraper
US20150231775A1 (en) * 2014-02-19 2015-08-20 The Boeing Company Adhesive Scoop
US9839943B2 (en) * 2014-02-19 2017-12-12 The Boeing Company Adhesive scoop having a rigid unitary form with plurality of fillets

Also Published As

Publication number Publication date
GB8810490D0 (en) 1988-06-08

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