HAND OPERATED POWDER SPRAY PISTOL

Abstract: Arrangement for a powder sprayer (1) intended for powder and equipped with an electrostatic charging facility for the powder, which exhibits a number of coiled charging ducts (5-8) and a diffusor (12). The invention enables a spray pistol to be produced which, amongst other things, is light in weight and effective in use. The sprayer (1) exhibits a handle part (3) projecting downwards from an upper casing part (2), said casing part (2) enclosing the charging ducts (5-8) in question packed tightly together, and with at least a major part (12A) of said diffusor (12) being accommodated and enclosed inside the handle part (3).

Description: Hand operated powder spray pistol The present invention relates to an arrangement for a powder sprayer intended for powder and equipped with an electrostatic charging facility for the powder, which exhibits a number of coiled charging ducts capable of receiving powder and a diffusor. The principal object of the present invention is, in the first place, to produce an arrangement of the kind referred to above, which, in addition to functioning well, is light in weight and compact and is also suitable for manual operation. Said object is achieved by means of an arrangement in accordance with the present invention, which is characterized essentially in that the sprayer exhibits a handle part projecting downwards from an upper casing part, said casing part enclosing the charging ducts in question packed tightly together, and in that at least a major part of the diffusor is accommodated and enclosed in the handle part. The invention is described below as a preferred illustrative embodiment, in conjunction with which reference is made to the following drawings, of which: Fig. 1 shows an oblique view from the rear of a spray pistol arranged in accordance with the invention; Fig. 2 shows an oblique view from the front of the spray pistol; Fig. 3 shows a charging duct which is a part of the spray pistol; Fig. 4 shows the spray pistol in a partially sectioned state; Fig. 5 shows an oblique view from the front of a diffusor which is part of the spray pistol; Fig. 6 shows the diffusor in a sectioned state; Fig. 7 shows an oblique view from the rear of the spray pistol. A powder sprayer 1 arranged in accordance with the present invention comprises, when the sprayer is held in its normal, upright spraying position, an upper casing part 2 and a handle part 3 projecting downwards at an angle from said casing part 2, and is so executed as to resemble a pistol, as shown in Figs. 1 and 2, for example. The powder spray pistol 1 is preferably made from a cast plastics material with a preferably tubular nozzle 4 situated at the front part 2A of the frame part and a number of components cast from the plastics material and accommodated on its inside. Accommodated inside the casing part H are a number of coiled ducts 5-8 consisting of an electrically non—conductive material, preferably a plastics material, which are intended on the one hand to convey the quantity of powder supplied to the powder spray pistol 1 to the spray pistol nozzle 4, and on the other hand to charge the powder electrostatically in a previously disclosed fashion through the effect of friction with the internal walls of the ducts. In order to permit the effective charging of the powder, each of said ducts 5—8 is curved along its section 5A—8A into a shape resembling that of a spiral, with the ducts 5—8 being connected along their periphery with an electrically conductive material in a previously disclosed fashion so as to permit the connection of the ducts 5—8 to earth or to a source of voltage. The aforementioned charging ducts 5—8 are packed tightly inside the casing part 2, with the spiral—like coiled sections 5A—8A of the duct being accommodated in pairs 5A, 6A; 7A, 8A on a common core 9, 10, preferably consisting of a metallic material, and which may also be capable of being connected to earth or to a source of power. Thus, in the design illustrated here, two cores 9, 10 are positioned in parallel in relation to one another and alongside one another. The tight packing of the ducts 5-8 is permitted, amongst other things, by the fact that the ducts 5-8 are supported with the spiral sections 5A, 6A; 7A, 8A in line with the spiral turns 5 1 , 6 1 , 7 1 , 8^ of each duct 5—8 arranged alternately, i.e. so that one turn, for example 5^ , 7^ , of one of the ducts 5, 7 is adjacent to one turn, for example ό-', 8^ of the second duct 6, 8 , and so on. Each of the charging ducts 5—8, which may preferably be pre—formed in such a way as to exhibit the form illustrated in Fig. 3, for example, before it is installed in the spray pistol 1, thus enabling it to be connected easily to each core 9, 10 by being laid together in pairs in such a way that the spiral turns 5 1 , 7^ and 6 1 , 8^ engage with one another, whereupon each coil is introduced into the central opening 11 of each spiral section 5A—8A, preferably exhibits a part 5^—82 running along each spiral part 5A—8A and a connecting part 5^-8^ running at an angle to it. The aforementioned connecting parts 5^—8^ are so arranged as to extend to a diffusor 12 accommodated by the handle part 3, a major part 12A of which at least is accommodated in the handle part 3 inside a hollow space 13, as clearly shown in Fig. 4. The charging ducts 5—8 are capable of being connected in a previously disclosed fashion to an appropriate disc—shaped connecting part 14 in an attachment part 15 which is capable of being separated from the diffusor 12. A large number of passages 16 situated in said connecting part 14 and preferably arranged in the form of a ring serve not only as an attachment for each charging duct 5—8, but also as a trap for lumps of powder and other large objects which are not intended to pass through the openings 16 and into the charging ducts 5—8. The connecting part 14 of the diffusor 12, which preferably consists of a sleeve—shaped jacket part 17, a connecting hose attachment part 18 and an enclosed diffusor sleeve 19 provided with small holes, said diffusor having an air supply connection 20 attached to the jacket 17, may exhibit annular grooves 21 situated at a certain distance from one another and in which 0 -rings 22 or other securing rings or similar hoop—shaped devices made of an elastic material are accommodated. These securing devices 22 are so arranged as to interact with the inside of the diffusor accommodating space 13 of the handle part, amongst other things so as to secure the diffusor 12 to the spray pistol 1. As will be appreciated from Fig. 4, the aforementioned air supply connection 20 is situated on a part 12B of the diffusor 12 projecting from the handle part 3, preferably facing towards the rear end 1A of the spray pistol. The spray pistol 1 may also exhibit in a previously disclosed fashion an actuating mechanism 23, which, via lines 24 and a connection 25, permits connection to be made to a suitable power source, whilst the spray pistol 1 with its attachment 18 can be connected to a powder supply container via a hose. The aforementioned charging ducts 5-8 may, for the purpose of further increasing the charging capacity of same, be bent in such a way that the spiral—shaped part 5A—8A is provided with kinked sections 26, as shown in Fig. 3, whereby the powder which is transported through the spiral section is imparted with a reversed direction of movement as a result of the aforementioned kinked sections 26, such that the powder is agitated inside the ducts 5-8 and makes contact on all its surfaces with the internal walls of the ducts so that it is charged effectively. The proposed spray pistol is light in weight and easy to use, in addition to which it is effective in use. The invention is not restricted to the illustrative embodiment described above and illustrated in the drawings, but may be modified within the scope of the Patent Claims without departing from the idea of invention.

Claims: P a t e n t C l a i m s 1. An arrangement for a powder sprayer (i) intended for powder and equipped with an electrostatic charging facility for the powder, which exhibits a number of charging ducts (5-8) capable of receiving powder and a diffusor (12) , c h a r a c ¬ t e r i z e d in that the sprayer (1) exhibits a handle part (3) projecting downwards from an upper casing part (2) , in which said diffusor (12) , which is in the form of a sleeve-shaped jacket part (17) , is accommodated with at least a major part (12A) to be capable of being received in a space (13) in the handle part (3) , in that said rβ-formed charging ducts (5-8) are enclosed in the casing part (2) packed tightly together, and in that a connecting part (5 2-82 and 53-83) of each charging duct (5-8) extends from the diffusor (12) to the ducts (5-8) . 2. An arrangement according to Patent Claim 1, c h a r a c t e r i z e d in that two charging ducts (5-8) arranged next to one another on a core (8, 10) extend towards a nozzle (4) situated at one end (2A) of the casing part. 3. An arrangement according to any of the preceding Patent Claims, c h a r a c t e r i z e d in that the charging ducts (5-8) are spiral shaped coiled. 4. An Arrangement according to Patent Claim 3, c h a r a c t e r i z e d in that supported on a common core (9, 10) are two charging ducts (5, 6; 7, 8) consisting of electrically non-conductive material in line with the spiral turns (5A-8A) of the respective ducts (5-8) arranged alternately, i.e. with one turn (5 , 7 ; 6 , 8 ) of one of the ducts (5, 7 and 6, 8) lying adjacent to one turn (6 , 8 and 5 , 7 ) of the second duct (6, 8 and 5, 7) , and so on. 5. An arrangement according to any of the Patent Claims 3-4, c h a r a c t e r i z e d in that a connecting part (5 2-82) of each charging duct (5-8) running alongside the spirals (5A-8A) . 6. An arrangement to Patent Claim 5, c h a r a c ¬ t e r i z e d in that the end (5 -8 3 ) of each connecting part (5 2-82) are bent at an angle from said ends (53-83) against the handle part (3) . 7. AΛ arrangement according to any of the preceding Patent Claims, c h a r a c t e r i z e d in that between the diffusor (12) and the handle part (3) there are arranged attach¬ ment devices (22) which permit the diffusor (12) to be secured. 8. An arrangement according to Patent Claim 7, c h a r a c t e r i z e d in that the attachment devices (22) in question consist of a number of elastic rings (22) or other hoop-shaped devices (22) extending around the diffusor (12) . 9. An arrangement according to Patent Claim 8, c h a r a c t e r i z e d in that two securing rings (22) situated at a certain distance for one another and each accommo¬ dated in its own groove (21) are supported by an attachment part (15) capable of being detached from the diffusor (12) . 10. An arrangement according to any of the preceding Patent Claims, characterized in that an air inlet (20) leading to the diffusor (12) is situated on a part (12B) of the diffusor (12) projecting from the handle part (3) .

Inventors: RUUD JAN, RUUD, JAN
Applicants: ICAB IND COATING AB, ICAB INDUSTRIAL COATING AB
Application year: 1986
Main classification: B05B5
IPC codes: B05B5