Source: https://patents.google.com/patent/US5022590A/en
Timestamp: 2018-07-22 02:03:03
Document Index: 186101463

Matched Legal Cases: ['art 22', 'art 22', 'art 36', 'art 6', 'art 22', 'art 6']

US5022590A - Spray gun for electrostatic spray coating - Google Patents
Spray gun for electrostatic spray coating Download PDF
US5022590A
US5022590A US07475108 US47510890A US5022590A US 5022590 A US5022590 A US 5022590A US 07475108 US07475108 US 07475108 US 47510890 A US47510890 A US 47510890A US 5022590 A US5022590 A US 5022590A
US07475108
The inventional spray gun for electrostatic spray coating of articles with powdery coating material as illustrated in FIGS. 1 through 7 consists essentially of the following parts: a gun barrel 2 from plastic; a spray nozzle 4 from plastic whose rear, ring-shaped end phase 3 can be forced, airtight, on the forward end face 5 on the front end 6 by screwing a threaded sleeve that fits over the spray nozzle 4 and consists of plastic on the front end 6 of the gun barrel 2 that is provided with a threading 7, with a first straight-line channel 10 being aligned with the nozzle opening 12; a voltage generator 14 having the form of a module and being exchangeably insertable in a second straight-line channel 16 from the rear of the apparatus; a carrier in the form of a gun grip which can be fitted into a recess 20 formed at the bottom rear in the gun barrel 2 and features a grip part 22, with the gun barrel 2 and its grip part 22 made jointly of one piece of plastic, and with a straight-line third channel 24 and parallel with it a straight-line fourth channel 25 extending through the gun grip 18, which two channels extend relative to the straight-line line first channel 10 of the gun barrel 2 at an angle 1 between 90° and 140°; a stiff e.g., plastic, tube 26 extending as powder channel at the same angle as that between the first channel 10 and the fourth channel 25, so that the tube 26 has a shank 27 which essentially extends through the entire channel 10 and a shank 28 extending essentially through the entire length of the fourth channel 25; a rear cover cap 30 that can be fastened by a single screw 32 on the back of the gun barrel 2 and is provided, at the top, with a hook 34 for hanging the spray gun up. The cap 30 and its hook 34 consist integrally of plastic. The parts can be assembled in a simple way by inserting in accordance with arrow 35 the lower shank 28 of the tube 26 in the fourth channel 25 of the gun grip 18, then inserting the forwardly protruding shank 27 of the tube 26, from the gun back, into the first channel, thereby fitting the head part 36 of the gun grip 18 into the recess 20 of the gun barrel 2, according to arrow 37; the voltage generator 14 is fitted from the back of the gun into the second channel 16, with the option of installing the voltage generator 14 before or after the tube 26; next, the rear covering cap 30 is set in place and fastened with the screw 32; then a rod-shaped electrical connector 40 with a low-voltage supply cable 41 is passed, according to arrow 42, through the straight-line third channel 24 and then twisted about 90° according to arrow 43. In the process, electrical contacts 44 on the front end of the rod-shaped connector 40 are automatically forced on electrical connecting elements 46 that are cast in the intermediate bottom 48 of the gun barrel 2. Above the intermediate bottom 48, electrical contacts 50 of the primary side connection of the voltage generator 14 bear on the electrical connecting elements 46. The electrical contacts 44 and 50 have the form of resilient pins. The longitudinal motion 42 and subsequent motion 43 of the connector 40 causes a radially protruding projection 51 of this connector 40 in the third channel 24 to first engage the lengthwise groove 52 and then a groove 53 extending in peripheral direction, through which latter the connector 40 is positioned in the longitudinal direction of the third channel 24. A hose 24 for the feeding of powdery coating material can be connected with a socket 55 of the fourth channel 25. The disassembly of the spray gun relative to FIG. 1 takes place in reverse order and is required, e.g., when the spray gun needs to be cleaned or when the tube 26 is to be exchanged. The voltage generator 14 contains at least a transformer 57 and a voltage multiplier cascade 59, both of which are cast in a block 60 from plastic making the voltage generator 14 an exchangeable module. Fastened on the backside 88 of the block 60, which in FIG. 3 is the right-hand end, is a feed module 90. Electrical contacts 50 for the primary side electrical connection of the voltage generator 14 protrude out of the feed module 90. The voltage generator 14 forms together with the feed module 90 an exchangeable unit. The secondary end of the voltage multiplier cascade 59 is provided with an electrical connecting pin 61. The latter is connected, by way of an electrical line 62 extending through the front part 6 of the gun barrel 2 and by way of a ring-shaped electrical conductor 63 on the rear end face of the spray nozzle 4, with an electrode 64, electrically, which electrode is contained in the spray nozzle 4 and serves to electrostatically charge the powdery coating material. The voltage supplied to the electrical connecting elements 46 can be selectively activated or interrupted by a reed switch 68, which by a trigger 70 on the grip part 22 is magnetically remote-operated. The rear end of the second channel 16 can be hermetically sealed so that no liquid, specifically no solvent can proceed to the second voltage generator 14 housed in this second channel. The second channel 16 and the unit of voltage generator 14 and feed module 90 housed in it extend essentially parallel to the first channel 10, which is arranged underneath, but protrude rearwardly beyond the first channel because the gun barrel 2 is so graduated on its rear end 72, in length, that rearwardly, below the intermediate bottom 48, the recess 20 is located with the second channel 16 extending above the recess 20 up into an upper rearward plane 74, whereas the first channel 10 is located completely within the rearward plane 75 located beneath, which in FIG, 1 defines the left-hand end of the recess 20, the upper boundary of which is the intermediate bottom 48. This makes the first channel 10, which empties in the lower rearward plane 75, about 20% to 50% shorter than what it would be if it extended up into the plane of the upper rearward plane 74. The axial spacing 71 between the two rearward planes 74 and 75 corresponds to the upper axial length of the recess 20 and amounts to between 50% and 300%, preferably 150% of the axial length of the transformer 57. Based on the voltage generator module 14, it can be said that the axial spacing 71 ranges between 30% and 70%, preferably about 50% of the axial length of the voltage generator module 14. The front end of the gun barrel 2 provided with the threading 7 is coaxial with the first channel 10 and has only a minimal diameter, just as large as required for the threading 7 and for accommodating the electrical line 62. This makes the first channel 10 very short requiring only little plastic for forming the spray gun barrel alongside this first channel 10. As a result, no disadvantageous deformations of material are encountered in the manufacture. The lower barrel part forming the first channel 10 and the lower rearward plane 75 as well as the front part 6 with the threading 7 is marked 76. The upper barrel pare 78 located above it extends from the upper rearward plane 74 up to a forward shoulder 80 that tapers into the front end 6 sufficiently far as required for forming the second channel 16 for housing the voltage generator 14 and its feed module 90.
1. Spray gun for electrostatic spray coating of articles with coating material, specifically with coating powder, with a fun barrel (2), a gun grip (18) and a fluid line (26) carrying the coating material and extending through channels of the gun grip (18) and of the gun barrel (2) and extending curved at approximately the same angle as the gun grip to the gun barrel, characterized in that the gun grip (18) and the fun barrel (2) are two bodies which are detachably connected with each other, in that the fluid line (26) is a stiff tube with two tubular shanks (27, 28) which at said angle extend obliquely to each other, and in that one tubular shank (28) is removably inserted in a channel (25) of the gun grip (18) while the other tubular shand (27) is removably inserted in a first channel (10) of the gun barrel (2), each from the bordering side of the gun grip (18) and the gun barrel (2),
in that the gun barrel (2) includes a rear end (74, 75), in that the rear end (74, 75) of the gun barrel (2) is in its length so graduated that its rear end features at the bottom a recess (20),
in that a first channel (10) is located is located in a lower barrel part (76) of the gun barrel (2), which due to the recess is shorter than an upper barrel part (78) of the gun barrel (2),
in that a second channel (16) with a voltage generator (14) is located in the upper barrel part (78), which equal to the length of the recess (20) protrudes rearwardly beyond the lower barrel part (76),
in that a transformer (57) of the voltage generator (14) with in a second channel (16) extends with at least one-half of its length rearward beyond the first channel (10),
in that a part (36) of the gun grip (18) is fitted in the recess (20), of the gun barrel (2), that is situated rearwardly below,
in that a third channel (24) extending through the gun grip (18) is straight for receiving an electrical connector (40), and
in that connecting elements (46, 50) for electrical connection of a primary side of the voltage generator (14) are relative to an inner end of the third channel (24) so arranged that they will automatically make contact with electrical contacts (44) that are located on the end of the connector (40) away from a voltage supply cable (41), as the connector (40) is passed, from outside, through the third channel (24), for which purpose the connector (40) is rod-shaped and stiff.
2. Spray gun according to claim 1, characterized in that the tube (26) consists of several interconnected parts (27, 28, 29), each made from plastic.
3. Spray gun according to claim 9, characterized in that the gun barrel (2) includes a rear end (74, 75), in that the rear end (74, 75) of the gun barrel (2) is in its length so graduated that its rear end features at the bottom a recess (20)
in that connecting elements (46, 50) for electrical connection of a primary side of the voltage generator (14) are relative to an inner end of the third channel (24) so arranged that they will automatically make contact with electrical contacts (44) located on the end of the connector (40) away from a voltage supply cable (41), as the connector (40) is passed, from outside, through the third channel (24), for which purpose the connector (40) is rod-shaped and stiff.
4. Spray gun according to claim 1, characterized in that the gun grip (18) in the third channel (24) is provided with insert/twist/locking means (52, 53) into which the rod type electrical connector (40) in this third channel is inserted in the way of a quarter-turn catch and can then be positioned axially by a partial rotation , with this insert/twist movement at the same time establishing automatically an electrical connection of also the electrical contacts (44) of the connector (40) with the electrical connecting elements (46) leading to the primary side of the voltage generator (14).
US07475108 1989-02-14 1990-02-05 Spray gun for electrostatic spray coating Expired - Fee Related US5022590A (en)
DE3904437 1989-02-14
DE19893904437 DE3904437A1 (en) 1989-02-14 1989-02-14 Spray gun of electrostatic spray coating
US5022590A true US5022590A (en) 1991-06-11
ID=6374069
US07475108 Expired - Fee Related US5022590A (en) 1989-02-14 1990-02-05 Spray gun for electrostatic spray coating
US (1) US5022590A (en)
EP (1) EP0383031B1 (en)
JP (1) JPH0575465B2 (en)
DE (1) DE3904437A1 (en)
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JPH02241561A (en) 1990-09-26 application
DE3904437A1 (en) 1990-08-16 application
JP1859685C (en) grant
JPH0575465B2 (en) 1993-10-20 grant
EP0383031B1 (en) 1992-12-23 grant
EP0383031A1 (en) 1990-08-22 application
Owner name: RANSBURG-GEMA AG,, SWITZERLAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUSCHOR, KARL;REEL/FRAME:005272/0811