JP2008200602A - Coating spray gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating spray gun which can arbitrarily change the spraying direction and position of an atomized paint in a low-cost and simple structure. <P>SOLUTION: An air circulation pipe consisting of a long, curved and deformable flexible pipe and a paint container accommodating a paint are attached to a gun main body, and a nozzle part 32 having a compressed air jetting hole 76 is installed at the tip end of the air circulation pipe. A paint supply pipe 40 consisting of a long, curved and deformable flexible pipe extending from the paint container is connected to the nozzle part 32. A paint supplied from the paint supply pipe to the nozzle part 32 is made to flow together with the compressed air circulated in the nozzle part 32 through the air circulation pipe to be atomized. A junction part 58, 71 for introducing both the compressed air and atomized paint to the jetting hole 76 of the nozzle part 32 is installed at the tip end of the nozzle part 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spray gun for painting, and more particularly to a novel structure of a spray gun for painting in which paint is atomized with compressed air and sprayed.

  2. Description of the Related Art Conventionally, a spray gun has been widely used as an apparatus for spraying paint on an object to be coated in the form of a mist. There are various types of spray guns for painting, and as one of them, paint air is supplied to the front end of the gun body, which is separately provided with compressed air supplied from the outside and a flow path for the paint. A nozzle part having a discharge port and an air outlet is provided, and air is applied to the paint discharged from the paint discharge port of the nozzle part in accordance with the opening / closing operation of a valve body such as a needle valve built in the gun body. 2. Description of the Related Art There is a known structure having a structure in which paint is atomized as fine particles by colliding with compressed air ejected from an ejection port and sprayed toward an object to be coated together with the compressed air.

  In a spray gun having such a structure, for example, by performing a very simple and simple operation of simply rotating the trigger lever attached to the gun body, the valve body is opened and closed, and the paint is coated. It is designed to be sprayed (sprayed) on objects. Therefore, for example, it is possible to effectively reduce the labor burden required for the painting work as compared with the case where a roller, a brush, or the like is used. However, the part to be painted of the object to be painted is a narrow, deep part or a return, with a relatively small opening, and the entire inner surface of the object to be coated having a C-shaped cross section, etc. In some cases, it is not easy to uniformly coat those portions using the conventional spray gun as described above.

  Under such circumstances, for example, Patent Document 1 below, for example, has an elongated spray nozzle in which an air flow path and a paint flow path are provided in parallel, and a paint discharge port and an air jet outlet are provided at the tip. What is attached to the front end of the gun body, and the following Patent Documents 2 and 3, etc. have such a slender spray nozzle that is flexible and can be freely bent and deformed. Each has been proposed. If it is used for a spray gun having these structures, the paint discharge port and the air jet port can be positioned in the immediate vicinity of the part to be painted in a narrow and deep part, and the spray nozzle can be deformed by bending the spray nozzle. Without changing the direction, only the spray direction of the atomized paint can be changed to an arbitrary direction. As a result, it is possible to uniformly and easily paint the portion to be coated, which has been difficult to paint with the conventional spray gun.

  However, in a conventional spray gun in which such a long and curved deformable spray nozzle is attached to the front end, the paint extends relatively from the front end of the gun body into the elongated spray nozzle. In order to be sent to the tip of the spray nozzle through a long paint flow path and to be discharged from the paint discharge port of the spray nozzle, an independent pressurized tank (pressure feed tank) separate from the spray gun ) Is connected to the gun body, and the paint in the pressurized tank is pumped through the paint hose to the paint flow path in the gun body. Moreover, in addition to the paint hose, an air hose extending from a compressed air supply source such as a compressor or a blower is directly connected to the gun body.

  For this reason, when such a long and narrow spray gun with a spray nozzle is used, it is unavoidable that the equipment attached to the spray gun becomes inevitably large and the equipment cost increases. Moreover, in addition to spray guns and spray nozzles, all paint hoses and pressurized tanks must be cleaned when changing colors. Due to the relatively large size, there is an inherent problem that the amount of paint that remains in the pressurized tank and is wasted when cleaning is inevitably increased.

  On the other hand, as disclosed in the following Patent Documents 4 to 6, the conventional spray gun has a coating film thickness formed on a surface to be coated in order to simultaneously coat a plurality of portions to be coated. For the purpose of making it uniform, some have a plurality of nozzle portions each provided with a paint discharge port and an air outlet at the front end of the gun body. However, in such a conventional multi-head type spray gun, a plurality of nozzle portions are provided in the gun body in a state in which the spray direction of the paint is fixed in a predetermined direction. It was not possible to paint a plurality of parts to be painted located in one direction at a time.

  In addition, as clarified in Patent Document 7 below, a plurality of nozzle portions are provided so as to be rotatable with screws or the like with respect to a predetermined support, respectively, and paint is sprayed from the plurality of nozzle portions. Some spray guns allow the direction to be changed independently of each other. However, with such a spray gun, it is troublesome to loosen or tighten the screw one by one when changing the spraying direction of each nozzle part. Moreover, the injection direction can be changed only within a limited range of two dimensions, and therefore, even if there are three or more nozzle parts, the injection direction of the paint of each nozzle part can be It was impossible to change it in three dimensions, and it was not possible to change it freely.

JP 2005-30204 A Japanese Patent Laid-Open No. 2-15572 JP 2001-104843 A JP 2002-66393 A Japanese Utility Model Publication No.59-65758 Japanese Utility Model Publication No.59-65757 Japanese Utility Model Publication No. 1-69648

  Here, the present invention was made against the background of the above-described circumstances, and the problem to be solved is only the spraying direction and spraying position of the atomized paint without changing the direction of the gun body. Provided is a spray gun for painting which is advantageously realized in a structure in which the structure can be changed arbitrarily, is inexpensive and simple, and can reduce the amount of labor and waste of cleaning as much as possible. This is the first problem to be solved. Moreover, this invention makes it the 2nd solution subject to provide the spray gun for coating which can change the spraying direction and spraying position of the atomized paint more freely and easily in a wider range. Is.

  Hereinafter, embodiments of the present invention will be described. In addition, the component employ | adopted in the aspect of the following description is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  And in order to solve said 1st subject, the place made into the 1st aspect of this invention is the spray gun for coating which atomizes a coating material with compressed air and injects, Comprising: (a) Said compressed air A gun main body to which an air supply pipe for supplying gas from the outside is connected; and (b) a long and flexible flexible pipe that communicates with the air supply pipe and extends from the gun main body. An air circulation pipe through which the compressed air supplied through the air supply pipe is circulated by opening the valve provided in the main body; and (c) the compressed air flowing through the air circulation pipe is A nozzle part provided at the tip of the air circulation pipe, (d) a paint container that is attached to the gun body and contains the paint, and (e) the Extend from the paint container and connect to the nozzle A long, curved and deformable flexible tube for supplying the paint in the paint container into the nozzle portion; and (f) provided at the tip of the nozzle portion through the paint supply tube. The paint part supplied to the nozzle part is joined to the compressed air that is circulated in the air circulation pipe to be atomized, and the joint part that guides both the compressed air and the atomized paint to the ejection hole A spray gun for painting, characterized in that

  In the second aspect of the coating spray gun according to the present invention, in the coating spray gun according to the first aspect, the air circulation pipe and the paint supply pipe are separate and independent pipes. Consists of the body.

  Furthermore, in the third aspect of the spray gun for painting according to the present invention, in the spray gun for painting according to the first or second aspect, when the air circulation pipe is bent and deformed, such a deformed state is obtained. It is composed of a tube having a maintainable material or structure.

  Furthermore, in a fourth aspect of the spray gun for painting according to the present invention, in the spray gun for painting according to any one of the first to third aspects, the paint in the paint container contains the compression gun. It is configured to be sucked up from the inside of the paint container by the air suction action and supplied to the nozzle portion through the paint supply pipe.

  And, in a fifth aspect of the spray gun for painting according to the present invention, in order to solve the second problem to be solved, in the spray gun for painting according to the first to fourth aspects, the air circulation pipe is: A plurality of nozzle portions are provided to extend from the gun body, and the nozzle portions are provided at respective tip portions of the plurality of air circulation pipes, while the plurality of paint supply pipes extend from the paint container. Are connected to each other, and the paint supplied to the plurality of nozzle parts through the plurality of paint supply pipes merges with the compressed air at the joining parts respectively provided at the tip parts of the plurality of nozzle parts, It atomizes and is comprised so that it may inject outside from the said injection hole of each of these nozzle parts.

  That is, in the first aspect of the spray gun for painting according to the present invention, the air circulation pipe extending from the gun body is curved and deformed, and the paint supply pipe extending from the paint container attached to the gun body is provided with the air circulation pipe. By making the curved deformation so as to follow, it is possible to arbitrarily change only the spraying direction and spraying position of the atomized paint without changing the orientation and posture of the gun body.

  In particular, in such a spray gun for painting, a paint container in which paint is accommodated is attached to the gun body, and a paint supply pipe extending from such a paint container has a nozzle portion at the tip of the air circulation pipe. Further, the paint is joined to the compressed air at a joining portion provided in the nozzle portion. Thus, for example, in addition to an air hose extending from a compressed air supply, a paint hose extending from a pressurized tank separate from the spray gun is connected to the gun body and through the paint hose from the pressurized tank. Unlike conventional spray guns that are configured to pump paint, a pressurized tank that is independent of the spray gun and a paint hose that connects the pressurized tank to the spray gun are omitted. As a result, the accessory equipment necessary for the painting operation together with the spray gun can be reduced in size, the entire structure including the accessory equipment can be simplified, and the equipment cost can be advantageously reduced.

  Moreover, since a junction where paint is joined with compressed air is provided at the tip of the nozzle, a gun is used to send the paint in the paint container to the tip of the nozzle through a long paint supply pipe. The necessity of applying a predetermined pressure in the paint container attached to the main body and feeding the paint from the paint container toward the nozzle portion can be advantageously eliminated. For this reason, it is possible to make the paint container sufficiently smaller than a pressurized tank, etc., so that it remains in the paint container after the completion of the painting operation and is wasted when it is washed. The amount of paint can be effectively reduced.

  Therefore, in the spray gun for painting according to the present invention as described above, it is possible to arbitrarily change only the spraying direction and spraying position of the atomized paint without changing the direction of the gun body, It can be realized very advantageously in a structure that is inexpensive and simple, and that can reduce the amount of time and effort during cleaning and the amount of paint to be discarded as much as possible.

  Further, according to the second aspect of the spray gun for painting according to the present invention, the air circulation pipe and the paint supply pipe can be formed of different materials. Thus, for example, the air supply pipe is formed of a material having sufficient pressure resistance that is not damaged by compressed air, while the coating supply pipe is transparent with a low pressure resistance, but the inside can be visually confirmed. The air circulation pipe and the coating material supply pipe can be configured to have only proper characteristics required for each of them.

  Furthermore, according to the 3rd aspect of the spray gun for coating according to this invention, it becomes possible to maintain the injection direction of a coating material in a desired direction.

  Furthermore, according to the fourth aspect of the spray gun for painting according to the present invention, the paint container can be attached to the gun body so as to be positioned below the gun body. Thereby, for example, even when the capacity of the paint container is increased as compared with the case where the paint container is attached to the gun body so as to be positioned on the upper side, the spray gun is stably gripped, It can be handled. As a result, there is an advantage that the painting operation can be performed more smoothly and efficiently.

  According to the fifth aspect of the spray gun for painting according to the present invention, the plurality of air circulation pipes are simply formed in different shapes or directions without any troublesome operations such as screw tightening / loosening operations. Of course, it is possible to change the spray direction of the paint in two dimensions without changing the orientation of the gun body simply by bending the plurality of paint supply pipes so as to follow the air flow pipes. Also, three-dimensionally, it can be changed more freely and easily in a wider range, and the interval between the nozzle portions can be adjusted larger and more freely. As a result, the painting operation can be performed reliably and extremely advantageously under a wider range of conditions.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, in FIG. 1, one embodiment of a spray gun for painting having a structure according to the present invention is schematically shown in its front form. As is clear from FIG. 1, the spray gun according to the present embodiment includes a gun body 10. The gun body 10 has the same basic structure as a conventional air gun attached to the tip of an air hose extending from a compressed air supply source such as a compressor.

  That is, the gun body 10 has a pistol shape as a whole, and has a body portion 12 having a predetermined length, and a grip portion 14 extending downward from one end side (right side in FIG. 1) of the body portion 12 in the length direction. And a trigger lever 16 that is pivotally attached to an intermediate portion in the longitudinal direction of the body portion 12. In the following, for convenience, one side in the length direction (right side in FIG. 1) where the grip portion 14 is provided in the gun body 10 is referred to as a rear part, and the opposite side (left side in FIG. 1) is referred to as a front part. I will say.

  In the gun body 10, a tubular hose joint 18 is provided at the lower end portion of the grip portion 14, and a tubular nipple 20 is attached to the front end portion of the body portion 12. Further, an air flow path 22 extending continuously across the grip portion 14 and the body portion 12 is provided inside the gun body 10, and both ends of the air flow path 22 are connected to the hose joint 18. Each of the nipples 20 is connected to each inner opening. Further, an air hose 24 as an air supply pipe extending from a compressed air supply source such as a compressor (not shown) is connected to the outer opening of the hose joint 18. Then, compressed air supplied from the outside through the air hose 24 is introduced into the air flow path 22 inside the gun body 10 from the hose joint 18, and this air flow path 22 is passed through the end on the nipple 20 side. The nipple 20 is further blown out through the outer opening of the nipple 20.

  On the air flow path 22 in the grip portion 14, an open / close valve 26 is provided as a valve body that opens and closes the air flow path 22. The on-off valve 26 is opened and closed by a turning operation of the trigger lever 16 attached to the body portion 12. That is, here, in a normal state in which the trigger lever 16 is not rotated at all, the on-off valve 26 is closed, and the nipple 20 of compressed air introduced from the hose joint 18 into the air flow path 22. On the other hand, when the trigger lever 16 is turned to the side approaching the grip portion 14 against the urging force of a coil spring (not shown) or the like, the flow to the side is blocked or blocked. When the on-off valve 26 is opened, the compressed air introduced from the hose joint 18 into the air flow path 22 is allowed to flow to the nipple 20 side, and the compressed air flows from the outer opening of the nipple 20 to the outside. To be blown out. Further, when the trigger lever 16 is rotated to the side away from the grip portion 14 by the urging force by a coil spring or the like (not shown) and returned to the normal position before the rotation again, The flow of the compressed air is blocked, and the blowing of the compressed air from the outer opening of the nipple 20 is stopped.

  In the spray gun of this embodiment, an air circulation pipe 30 that can be freely bent and deformed is connected to the nipple 20 provided at the front end of the gun body 10. Compressed air from the air flow path 22 is allowed to flow into. Further, a nozzle portion 32 having a special structure is provided at the front end portion of the air circulation pipe 30 opposite to the gun body 10 side. And the coating material container 28 is attached to the lower side of the nipple 20 provided in the front-end part of the gun main body 10 so that attachment or detachment is possible.

  More specifically, the paint container 28 is a rectangular bottle formed using a soft resin material, and is relatively thin and sufficiently light. In addition, a cylindrical attachment tube portion 34 is integrally provided at the center of the upper bottom portion of the paint container 28 so as to extend upward at a predetermined height. The inside and outside of the coating container 28 are communicated with each other through the inner hole of the mounting cylinder 34, and the outer opening of the inner hole of the mounting cylinder 34 is connected to the predetermined coating material in the coating container 28. The pouring spout 36 is used to pour in. Further, a male screw portion (not shown) is provided on the outer peripheral surface on the upper end side of the mounting tube portion 34. Then, the male screw part is screwed into a female screw part (not shown) provided on the connection cap 39, so that the connection cap 39 is detachably attached to the attachment cylinder part 34 of the paint container 28. In addition, the spout 36 is closed in a fluid-tight manner.

  In the present embodiment, the female thread portion of the connection cap 39 that is screwed into the paint container 28 has a structure that is substantially the same as that of a general PET bottle lid member. As a result, it is possible to attach various types of commercially available PET bottles to the connection cap 39, and empty containers and the like for various beverage PET bottles that can be easily obtained at low cost are used as the paint container 28. It can be used. Further, the other end portion of the connection cap 39 is also provided with a female screw portion (not shown).

  Further, in the paint container 28, a long paint supply pipe 40 is attached so as to extend to a position passing through the upper bottom and reaching the vicinity of the lower bottom.

  Here, the paint supply pipe 40 is constituted by a transparent resin tube formed using, for example, polyethylene so that sufficient flexibility is exhibited while maintaining an appropriate hardness. ing. As a result, when a bending force is applied to the paint supply pipe 40, the paint supply pipe 40 is flexibly deformed flexibly and freely, so that it is locally bent and the inner hole is narrowed or narrowed. Is prevented from being blocked. Further, by having transparency, the flow state of the paint flowing through the inside can be easily visually confirmed or confirmed from the outside. Further, the length of the paint supply pipe 40 is not particularly limited, but the length from the connecting part to the nozzle part 32 to the paint container 28 is the same as the length of the air circulation pipe 30 described later. Further, it is preferably 15 cm or more, more preferably 30 cm or more, and further preferably 50 cm or more. The paint supply pipe 40 may be connected and supported to the air flow pipe 30 by using a binding band or the like at an appropriate position in the longitudinal direction.

  The paint container 28 to which such a paint supply pipe 40 is connected is detachably attached to the nipple 20 attached to the front end portion of the gun body 10 via a connection cap 39. In other words, one female threaded portion of the connection cap 39 is screwed into a male threaded portion (not shown) of the mounting projection 41 that is integrally formed to protrude below the nipple 20 and the other female threaded portion is coated with paint. The paint tube 28 is detachably attached to the nipple 20 in the lower part of the front part of the gun body 10 by screwing the attachment tube 34 of the container 28. Moreover, the spout 36 is liquid-tightly and airtightly closed by the connection cap 39 under such an attached state.

  On the other hand, as is apparent from FIGS. 1 and 2, the air flow pipe 30 attached in communication with the front end portion of the nipple 20 at the front end portion of the gun body 10 has a large number of resin sleeves 42 having short lengths. They are connected to each other in a row in a direction. The resin sleeve 42 constituting the air circulation pipe 30 is made of a synthetic resin material that is hard and relatively poor in elasticity and flexibility so as to sufficiently withstand the pressure of the compressed air, and has a sufficiently thick wall thickness. Is formed.

  In the resin sleeve 42, the end portion on one side in the length direction (axial direction) is the connecting convex portion 44, and the end opening on the other side of the inner hole is the connecting convex portion. The part 44 is plunged or fitted into a connecting recess 46 that fits in and out. Further, the outer peripheral surface of the connecting convex portion 44 is a spherical outer peripheral surface made of a part of a spherical surface, while the inner peripheral surface of the connecting concave portion 46 is from a part of the spherical surface corresponding to the spherical outer peripheral surface of the connecting convex portion 44. It becomes the spherical inner peripheral surface. Further, the spherical outer peripheral surface of the connecting convex portion 44 and the spherical inner peripheral surface of the connecting concave portion 46 have outer diameters or inner diameters at both ends in the length direction, and outer diameters or inner diameters in the middle portion in the length direction. Has been smaller than. Furthermore, the outer peripheral surface of the intermediate portion in the length direction of the resin sleeve 42 extends from one end side in the length direction which is the connection convex portion 44 to the other end side in the length direction where the connection concave portion 46 is provided. The tapered cylindrical surface gradually increases in diameter.

  A large number of such resin sleeves 42 are all arranged coaxially in a line in the same direction with the connecting projections 44 positioned on the front side, and in such an arrangement state, adjacent resin sleeves are arranged. The connecting convex portion 44 of the resin sleeve 42 located on the rear side of the 42 is fitted so as to be press-fitted into the connecting concave portion 46 of the resin sleeve 42 located on the front side of them, and the concave and convex portions are fitted. ing. Thereby, the resin sleeves 42 adjacent to each other are connected to each other in a state where the respective inner holes communicate with each other. Further, under such a connected state, the spherical outer peripheral surface of the connecting convex portion 44 and the spherical inner peripheral surface of the connecting concave portion 46 in the resin sleeves 42 adjacent to each other are slidable with respect to each other, while the connecting convex portion 44. The opening-side inner peripheral surface having a diameter smaller than that of the intermediate portion inner peripheral surface of the coupling recess 46 is engaged in the length direction with the end outer peripheral surface on the side of the connecting concave portion 46 having a smaller diameter than the intermediate portion outer peripheral surface. Thus, easy detachment of the connection convex portion 44 from the connection concave portion 46 is prevented.

  Thus, in the air circulation pipe 30 composed of a large number of connection bodies of the resin sleeves 42 as described above, the overall length can be appropriately changed depending on the number of connection of the resin sleeves 42. Here, for example, 15 cm The length is preferably very long, preferably 30 cm, and more preferably 50 cm or more. Also, the resin sleeves 42 connected to each other can be slid on the spherical outer peripheral surface of the connecting convex portion 44 and the spherical inner peripheral surface of the connecting concave portion 46 so that they can be bent and deformed in a free direction like a universal joint. Therefore, the air circulation pipe 30 is provided with flexibility that can be freely bent and deformed. Further, when the air circulation pipe 30 is bent and deformed by the user, the sliding resistance (frictional force) between the spherical outer peripheral surface of the connecting convex portion 44 and the spherical inner peripheral surface of the connecting concave portion 46 is not changed again. ), The curved deformation state can be maintained. For example, the curved deformation state is not naturally eliminated or changed due to its own weight or the like.

  Here, among the many resin sleeves 42 constituting the air circulation pipe 30 and connected to each other, the one located at the rear end of the air circulation pipe 30 has the connection convex portion 44 at the front end. However, although it is the rear side joint sleeve 48 in which the external thread portion is formed on the outer peripheral surface of the rear end portion, and the one located at the front end of the air circulation pipe 30 has the connection recess 46 at the rear end portion, The front joint sleeve 50 has a male screw portion formed on the outer peripheral surface of the front end portion.

  The rear joint sleeve 48 is screwed into the female screw portion provided in the nipple 20 at the front end portion of the gun body 10 at the male screw portion, so that the air flow pipe 30 has its inner hole connected to the gun hole. It is detachably attached to the front end portion of the gun body 10 in a state where it communicates with the air flow path 22 in the body 10 (see FIG. 1). In addition, since the male screw portion of the front joint sleeve 50 is screwed into the female screw portion provided in the nozzle portion 32, the nozzle portion 32 is detachably attached to the front end of the air circulation pipe 30. is there.

  As shown in FIG. 2, the nozzle part 32 attached to the front end of the air circulation pipe 30 is composed of two parts, a nozzle part main body 52 and a tip cap 56, which are coaxial in order from the rear side. And are integrally joined to each other.

  Of these two constituent members of the nozzle portion 32, the nozzle portion main body 52 has a rectangular rectangular tube shape as a whole, and an inner hole is formed in the middle portion in the axial direction with a front inner hole portion 58 and a rear inner hole portion. A partition wall 62 that is divided into two parts is provided. A female thread portion is provided on the inner peripheral surface of the rear opening portion of the rear inner hole portion 60, and the male thread portion of the front joint sleeve 50 of the air circulation pipe 30 is screwed into the female thread portion. ing.

  A circular mounting hole 64 is formed in the lower portion of the cylindrical wall portion surrounding the front inner hole portion 58 of the nozzle body 52, and a female screw portion is provided on the inner periphery of the mounting hole 64. ing. The mounting sleeve 66 is fixed by screwing a male thread portion provided at one end to the female thread portion of the mounting hole 64. The mounting sleeve 66 is bent in an L shape, and one end thereof is inserted into the front inner hole portion 58 through the mounting hole 64, while the other end is substantially horizontal. The nozzle portion main body 52 is attached so as to extend and with its opening directed to the gun main body 10 side. The mounting sleeve 66 is attached to the nozzle body 52 by securing the airtightness and liquid-tightness at the mounting portion by screwing the screw portion. The outer peripheral surface of the mounting sleeve 66 inserted into the mounting hole 64 may be adhered to the inner peripheral surface of the mounting hole 64, etc., and by using various seal structures, airtightness and liquid-tightness can be obtained. It is good also as a more reliable thing.

  Further, in the mounting sleeve 66, the outer diameter of a portion (lower right portion in FIG. 2) that extends horizontally from the base end portion extending in the vertical direction on the side opposite to the mounting side to the nozzle portion main body. The diameter is smaller than that of the base end portion or the bent portion extending in the vertical direction, and extends into a stepped cylindrical shape. A paint supply pipe 40 extending from the paint container 28 is connected to the tip end portion extending in the horizontal direction and having a reduced diameter. As a result, the inside of the paint supply pipe 40 and the inside of the front side inner hole portion 58 of the nozzle body 52 are communicated with each other through the mounting sleeve 66.

  Further, the partition wall 62 in the nozzle body 52 is provided with a small-diameter through-hole 68 that penetrates the central portion thereof. A thin tube 70 having an inner diameter sufficiently smaller than the inner diameters of the front inner hole portion 58 and the rear inner hole portion 60 is inserted into and fixed to the through hole 68 at one end portion in the length direction. As a result, the front inner hole portion 58 and the rear inner hole portion 60 are communicated with each other through the narrow tube 70 having a flow path cross-sectional area sufficiently smaller than the flow path cross-sectional area thereof. The thin tube 70 is also attached to the partition wall 62 by attaching its outer peripheral surface to the inner peripheral surface of the through-hole 68 by using an adhesive or a known sealing material. Airtightness and liquid tightness between the outer peripheral surface of 70 and the inner peripheral surface of the through hole 68 are ensured.

  On the other hand, the tip cap 56 as a whole has a rectangular rectangular tube shape having substantially the same outer peripheral dimensions as the nozzle body 52 and an axial length shorter than the nozzle body 52. Further, the tip cap 56 has an inner hole 71 having an inner diameter smaller than that of the front inner hole portion 58. In addition, the inner peripheral surface of the inner hole 71 is a tapered inner peripheral surface that gradually becomes smaller in diameter toward the front side, and the front end portion of the inner hole 71 is protruded into the tip cap 56. The ejection hole 76 has an inner diameter larger than the inner diameter of the thin tube 70. Further, the rear end portion of the tip cap 56 is made slightly smaller than the outer peripheral dimension of the nozzle portion main body 52, and a male screw portion is provided on the outer peripheral side. The male screw part of the tip cap 56 is inserted into the female screw part of the nozzle body 52 and screwed together, so that both members are fixed to each other in a fluid-tight manner. Accordingly, the tip cap 56 is connected to the nozzle portion main body 52, and the ejection hole 76 is communicated with the front inner hole portion 58 of the nozzle portion main body 52 through the inner hole 71 of the tip cap 56.

  Thus, in the spray gun of the present embodiment, when the opening / closing valve 26 in the gun body 10 is opened by the turning operation of the trigger lever 16 in the gun body 10, the hose joint 18 enters the air flow path 22. Then, the compressed air introduced into the air flow pipe 30 from the air flow path 22 flows into the rear inner hole portion 60 of the nozzle part body 52 in the nozzle part 32 from the air flow pipe 30. Thus, the gas is allowed to flow through the narrow tube 70 and is further ejected from the ejection hole 76 through the front inner hole portion 58 of the nozzle body 52 and the inner hole 71 of the tip cap 56.

  At this time, the compressed air that has flowed into the front inner hole portion 58 of the nozzle section main body 52 is increased in flow velocity while flowing through the narrow tube 70 functioning as a throttle, while the pressure is decreased. As a result, negative pressure is generated in the inner hole 71 of the tip cap 56 where the thin tube 70 is opened and in the front inner hole portion 58 of the nozzle body 52 communicating therewith. As a result, the paint in the paint container 28 is sucked up by the paint supply pipe 40 communicated with the front inner hole portion 58 through the attachment sleeve 66 and circulates in the paint supply pipe 40. It is introduced into the front inner hole portion 58 of the main body 52 and further into the inner hole 71 of the tip cap 56, and is blown out from the narrow tube 70 in the front inner hole portion 58 and the inner hole 71 of the tip cap 56. Combined with compressed air. Then, the paint combined with the compressed air is dispersed by the compressed air, atomized (miniaturized or reduced in size), and then sprayed from the ejection hole 76 of the tip cap 56 together with the compressed air. . As is clear from this, the merging portion is constituted by the front inner hole portion 58 of the nozzle portion main body 52 and the inner hole 71 of the tip cap 56 here.

  As described above, in the present embodiment, the air circulation pipe 30 and the coating material supply pipe 40 have flexibility that can be freely bent and deformed. When the user is bent and deformed, the bent and deformed state can be satisfactorily maintained unless the hand is again applied.

  Therefore, in such a spray gun of the present embodiment, the air flow pipe 30 extending from the gun body 10 is curved and deformed, and the paint supply pipe 40 extending from the paint container 28 attached to the gun body 10 is provided. By bending and deforming so as to follow the air circulation pipe 30, the direction and position of the ejection hole 76 of the nozzle portion 32 can be easily and freely changed.

  Further, in such a spray gun, since the paint and the compressed air are joined at the front end side portion inside the nozzle portion 32, the paint supply pipe 40 is elongated, The paint in the paint container 28 is sucked up from the paint container 28 by the suction action of the compressed air without being pumped at all, and flows in the long paint supply pipe 40 toward the nozzle portion 32, It can be supplied smoothly and reliably to the front end portion inside the portion 32 and can be sprayed in an atomized state from the ejection hole 76. For this reason, unlike the conventional apparatus which supplies and supplies the paint into the nozzle portion 32, a pressurized tank independent of the spray gun and a paint hose connecting the pressurized tank and the spray gun are omitted. As a result, the auxiliary equipment necessary for the painting operation together with the spray gun can be reduced in size, the entire structure including the auxiliary equipment can be simplified, and the equipment cost can be advantageously reduced.

  Moreover, since the paint is not pumped, the inside of the paint container 28 in which the paint is accommodated is not pressurized, and therefore the paint container 28 is not required to have any high pressure resistance. Therefore, such a paint container 28 can be made sufficiently smaller than a pressurized tank or the like that inevitably becomes large in order to have sufficient pressure resistance. As a result, the amount of paint that remains in the paint container 28 after the completion of the painting work and is wasted when washing is compared to the case where a pressurized tank is used as the paint container. Thus, it can be effectively reduced.

  Therefore, in the spray gun for painting according to this embodiment as described above, only the spraying direction and spraying position of the atomized paint can be arbitrarily changed without changing the orientation or posture of the gun body 10. In addition, it can be realized very advantageously in a structure that is inexpensive and simple, and that can reduce the amount of time and effort during cleaning and the amount of paint to be discarded as much as possible. As a result, for example, a conventional general spray, such as a narrow back part or an entire inner surface of an object to be coated having a relatively small opening and a C-shaped cross section. This means that it was possible to easily and inexpensively paint a portion that was difficult to paint with a gun.

  Further, in the present embodiment, the air circulation pipe 30 and the paint supply pipe 40 are configured by independent members using different materials, respectively, and have sufficient pressure resistance against the air circulation pipe 30. On the other hand, the paint supply pipe 40 is given transparency so that the inside can be visually recognized. As a result, the air circulation pipe 30 and the paint supply pipe 40 are configured to have only the characteristics required for each of them, and these are the pipe bodies 30 and 40 and thus the entire spray gun. This helps to reduce costs.

  Furthermore, in the spray gun of this embodiment, the paint in the paint container 28 attached to the front end of the gun body 10 is sucked up from the paint container 28 by the suction action of the compressed air, and the paint supply pipe Since the paint container 28 is attached to the lower side of the gun body 10 through the nipple 20, the paint in the paint container 28 is supplied to the nozzle portion 32 through 40. However, it can be smoothly supplied toward the nozzle portion 32. As such, since the paint container 28 is attached to the lower side of the gun body 10 while ensuring a smooth supply of the paint to the nozzle portion 32, the paint container 28 is attached to the upper side of the gun body 10. Unlike the case, even if the capacity of the paint container 28 is increased, the gun body 10 can be stably held and handled. As a result, the advantage that the painting operation can be performed more smoothly and efficiently is obtained.

  Further, in the present embodiment, the tip cap 56 and the nozzle body 52 that constitute the joining portion of air and paint are connected by the male screw portion and the female screw portion of both members, and the inner hole of the tip cap 56 The inner diameter dimension of 71 is changed in a taper shape. Accordingly, even when clogging occurs due to dust or a lump of paint in the joining portion including the tip cap 56 and the nozzle portion main body 52 during the painting operation, the screwed state of the tip cap 56 and the nozzle portion main body 52 is loosened. Thus, it is possible to discharge the clogging of the coating material by adjusting the gap size between the narrow tube 70 and the inner peripheral surface of the inner hole 71 to change the flow rate of the air and the coating material. As a result, even when using old paints that tend to contain solid lumps, etc., every time clogging occurs, the clogging is easily eliminated without requiring troublesome work such as disassembly and cleaning of the equipment. You can continue.

  Next, FIG. 3 and FIG. 4 show an embodiment different from the first embodiment. In addition, regarding the spray gun for coating of this embodiment described below, the same reference numerals as those in FIGS. 1 and 2 are used for members and parts having the same structure as in the first embodiment. The detailed description is omitted by showing.

  That is, in the spray gun of the present embodiment, three air circulation pipes 30 and three paint supply pipes 40 each extend from the gun body 10 and the paint container 28. The air circulation pipe 30 has the same material and the same structure as the air circulation pipe 30 provided in the spray gun according to the first embodiment, and is flexible enough to bend and deform. Yes. Further, nozzle portions 32 having the same structure as in the first embodiment are attached to the front end portions of the respective air circulation pipes 30 one by one in the same mounting structure as in the first embodiment. Yes. The paint supply pipe 40 is also made of the same material as the paint supply pipe 40 provided in the spray gun according to the first embodiment, and is flexible enough to bend and deform.

  In this case, an air branching portion 78 is provided in the nipple 20 attached to the front end of the gun body 10 so as to branch one communication path communicating with the air flow path 22 into three. A state in which the three air flow pipes 30 are separately communicated to the three branched passages at the rear joint sleeve 48 provided at the rear end of the branch portion 78. It is attached.

  Further, in the paint container 28 attached to the lower side of the nipple 20, an elongated suction pipe 38 having an axial length larger than the height by a predetermined dimension passes through the upper lower portion and is near the lower bottom portion. It is attached so that it may extend straight up and down to the position where it reaches. The upper end portion of the suction pipe 38 is provided with a paint branching section 80 that branches the suction pipe 38 into three, and three paint supply pipes 40 communicate with the paint branching section 80, respectively. Connected in a state. Further, the three paint supply pipes 40 are attached to the attachment sleeves 66 of the nozzle part 32 provided at the front end parts of the three air circulation pipes 30 in the communicating state at the respective front end parts. .

  Thus, in the spray gun of this embodiment, when the opening / closing valve 26 in the gun body 10 is opened by the turning operation of the trigger lever 16 in the gun body 10, it is introduced into the air flow path 22. Compressed air is caused to flow into the three air circulation pipes 30 through the air branching portions 78, and is then ejected to the outside from the ejection holes 76 of the nozzle portions 32 provided at the front end portions of the respective air circulation pipes 30. It is supposed to be. Further, at this time, the paint in the paint container 28 is sucked up by the suction pipe 38 by the suction action of the compressed air, and flows into the three paint supply pipes 40 through the paint branching section 80, respectively. These are distributed in the respective paint supply pipes 40 and supplied into the respective nozzle portions 32. And it atomizes within each nozzle part 32, and is injected outside with the compressed air from the ejection hole 76 of each nozzle part 32.

  Here, all the air circulation pipes 30 and the paint supply pipes 40 can be freely curved and deformed, and the curved deformation state of each air circulation pipe 30 is maintained. The three air distribution pipes 30 extending from the gun body 10 are curved and deformed, for example, in three-dimensionally different directions or shapes, and three paint supplies extending from the paint container 28 attached to the gun body 10 are provided. By simply performing an operation of bending and deforming the tube 40 so as to follow each air flow tube 30, the direction and position of the ejection hole 76 of each nozzle portion 32 can be easily and more freely within a wider range. In addition, the interval between the ejection holes 76 of the nozzle portions 32 can be changed more freely.

  Therefore, in such a spray gun for painting according to this embodiment, not only can the same operation / effect as the operation / effect achieved in the first embodiment be enjoyed, but also atomization. Further excellent characteristics such that the spraying direction and spraying position of the paint can be changed more freely and easily in a wider range can be exhibited.

  In addition, by using the coating spray gun according to the present embodiment, even when coating is performed on the surface of a pipe-like object, the orientations of the ejection holes 76 of the three nozzle portions 32 and the respective By adjusting the position of the nozzle portion 32 and spraying paint simultaneously from three directions on the circumference according to the bending of the pipe surface, for example, by a single spraying operation of moving the spray gun along the longitudinal direction of the pipe By coating the entire circumference of the pipe or by painting half a cycle, it is possible to easily and uniformly paint a wide range on the circumference simultaneously.

  Furthermore, in the present embodiment, a plurality of paint containers 28 may be provided, and each paint container 28 may be connected to one nozzle portion 32. If such a structure is adopted, for example, paints of different colors are put in the paint containers 28 and applied simultaneously, so that parallel lines and curves composed of three colors can be freely drawn by one application. Will be able to. In addition, on-off valves are provided on the paint flow paths such as the mounting sleeves 66 connected to the paint containers 28 and the air flow paths such as the front joint sleeve 50, and these paints are blown out by opening and closing them appropriately. It may be possible to switch freely so that coating with a multicolor paint can be easily performed. Furthermore, the spread shape and amount of the paint discharged from each of the three nozzle parts 32, the application range, etc., by changing each nozzle part 32, or adjusting the paint flow path and the air flow path, etc. It is also possible to make them different from each other.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, the material of the paint supply pipe 40 is not limited as long as the paint supply pipe 40 is formed of a long flexible tube that can be bent and deformed. Therefore, the coating material supply pipe 40 can be constituted by a metal pipe such as copper, a resin tube made of a synthetic resin material other than the synthetic resin material exemplified in the embodiment, a rubber tube, or the like. Also, a commercially available rubber hose or the like can be employed as the paint supply pipe 40. This makes it possible to easily prepare the paint supply pipe 40 at a low cost.

  The material of the air flow pipe 30 is not particularly limited as long as the air flow pipe 30 is formed of a long and flexible tube that can be bent and deformed. However, the air flow pipe 30 has sufficient pressure resistance against the pressure of the compressed air. It is desirable to be a thing. In that sense, the air circulation pipe 30 is preferably composed of a metal pipe such as copper or stainless steel, a resin tube having sufficient pressure resistance, a rubber tube, or the like.

  Further, the structure capable of maintaining the curved deformation state of the air circulation pipe 30 is not limited to those illustrated in the two embodiments, and can be repeatedly bent and deformed, for example. A pipe body having a material capable of maintaining the state, for example, a copper pipe or the like, or using another member such as a predetermined jig for maintaining the curved deformation shape of the air circulation pipe 30, It is also possible to maintain 30 curved deformation states.

  Furthermore, in the two embodiments, the paint container 28 is attached so as to be located below the nipple 20 connected to the front end of the gun body 10. Of course, it is also possible to attach them so as to be located on the upper side or on the upper side or the lower side of the front end portion of the gun body 10 other than the nipple 20. When the paint container 28 is attached to the gun body 10 so as to be positioned on the upper side thereof, the paint in the paint container 28 passes through the paint supply pipe 40 through the paint supply pipe 40 due to the suction action of the compressed gas and the weight of the paint. The portion 32 can be supplied more smoothly and reliably.

  Furthermore, in the present embodiment, a commercially available plastic bottle is directly used as a paint container by using at least one female threaded portion of the connection cap 39 having a structure substantially similar to the lid of various commercially available plastic bottles. However, the connection cap 39 is formed integrally with the mounting cylinder part 41 of the nipple 20 so that the paint container 28 is directly fixed to the mounting cylinder part 41 of the nipple 20. Also good.

  Further, the specific structure of the nozzle portion 32 is not particularly limited to the illustrated one, and the compressed air and the paint supply tube that can be circulated through the air circulation pipe 30 at the front end portion (tip end portion) of the nozzle portion 32. Other known structures can be appropriately employed as long as a joining portion where the coating material circulated in 40 is provided.

  In addition, when a plurality of air circulation pipes 30 and paint supply pipes 40 are attached to the gun body 10 and the paint container 28 as in the second embodiment, the air circulation pipes 30 and the paint supply pipes are provided. Of course, the specific number of each of the tubes 40 is not limited in any way. Also, the mounting structure of the plurality of air circulation pipes 30 and the paint supply pipe 40 to the gun body 10 and the paint container 28 is not particularly limited to the illustrated one.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

Front explanatory drawing which shows one Embodiment of the spray gun for coating which has a structure according to this invention. FIG. 2 is a partially enlarged explanatory view including a partially cutaway view in FIG. 1. The figure corresponding to FIG. 1 which shows another embodiment of the spray gun for coating which has the structure according to this invention. Plane explanatory drawing in FIG.

Explanation of symbols

10: Gun body, 24: Air hose, 26: On-off valve, 28: Paint container, 30: Air distribution pipe, 32: Nozzle section, 40: Paint supply pipe, 42: Resin sleeve, 56: Nozzle section body, 58 : Front inner hole part, 60: rear inner hole part, 71: inner hole, 76: ejection hole, 78: air branch part, 80: paint branch part

Claims (5)

A spray gun for painting that sprays and sprays paint with compressed air,
A gun body connected to an air supply pipe for supplying the compressed air from the outside;
The air supply pipe is connected to the air supply pipe and extends from the gun body. The flexible pipe is a long and bendable and can be supplied by the air supply pipe by opening the valve provided in the gun body. An air circulation pipe through which the compressed air is circulated,
A nozzle portion provided at a tip portion of the air circulation pipe, having a jet hole for jetting the compressed air flowing through the air circulation pipe to the outside;
A paint container attached to the gun body and containing the paint;
A paint supply pipe which extends from the paint container and is connected to the nozzle part and is formed of a long and bendable flexible pipe, and supplies the paint in the paint container into the nozzle part;
The paint provided at the tip of the nozzle and supplied to the nozzle through the paint supply pipe is merged with the compressed air circulated in the air circulation pipe and atomized, while the compressed air And a joining portion for guiding the atomized paint together to the ejection hole,
A spray gun for painting characterized by comprising.   The spray gun for coating according to claim 1, wherein the air circulation pipe and the paint supply pipe are constituted by separate and independent pipe bodies.   The coating spray gun according to claim 1 or 2, wherein the air circulation pipe is constituted by a pipe body having a material or a structure capable of maintaining such a deformed state when the air circulation pipe is bent and deformed.   The said coating material in the said coating material container is sucked up from the inside of this coating material container by the suction effect | action of the said compressed air, and is supplied to the said nozzle part through the said coating material supply pipe | tube. The spray gun for painting according to any one of the above.   A plurality of the air circulation pipes extend from the gun body, and the nozzle part is provided at the tip of each of the plurality of air circulation pipes, while a plurality of the paint supply pipes extend from the paint container. The paints connected to the plurality of nozzle parts and supplied to the plurality of nozzle parts through the plurality of paint supply pipes are respectively connected to the joining parts provided at the tip parts of the plurality of nozzle parts. The coating air according to any one of claims 1 to 4, wherein the air is combined with compressed air, atomized, and sprayed to the outside from the spray holes of the nozzle portions. Spray gun.

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