MULTICOMPONENT SPRAY GUN AND SPRAY EQUIPMENT INCLUDING SAME

Abstract

The present invention relates to a spray gun of those that mix at least two pressurised components in an internal mixing chamber of said gun for subsequent pulverisation/projection to the outside through the dispenser, wherein the gun has a configuration that allows a frontal removal of the mixing chamber directly without disassembling the parts that surround same. The present invention also relates to a spray equipment for the mix with the aforementioned gun.

Claims

1. A spray gun of those having at least two inlets for components to be mixed in an internal piece of the gun which is a mixing chamber, characterized in that in the operating position the mixing chamber piece comprises an area adapted for retention that is held by a retaining element which can be operated from outside the gun with an actuation element, wherein the actuation element has a position in which it locks the position of the retaining element in the retaining position and a release position that allows the longitudinal displacement of the mixing chamber piece to a diffuser of the gun, wherein the mixing chamber part can be extracted frontally by the diffuser area without having to disassemble the head, releasing said mixing chamber part with the actuator.

2. The spray gun according to claim 1 wherein the mixing chamber piece has a longitudinal displacement element which, either automatically or by the user's action, displaces the mixing chamber part along the longitudinal axis in the extraction direction, once the actuating element is in its release position.

3. The spray gun according to claim 2 wherein, in its operating position, the mixing chamber piece presses against a spring placed between the mixing chamber piece and the adjacent internal piece in the longitudinal direction, while when the retaining action of the mixing chamber piece is released, the spring acts as a longitudinal displacement element, pressing the mixing chamber piece automatically towards the outside.

4. The spray gun according to claim 1, wherein the gun, in a longitudinal path of the mixing chamber piece to the diffuser or to the external front part of the gun, the gun does not have any element that prevents passage of the mixing chamber piece except for the diffuser itself, which is independently removable, and the possible pressure exerted by the friction bushings.

5. The spray gun according to claim 1 wherein the retaining element is a ball-securing piece that fits in the groove formed by the retaining area, where the longitudinal movement of the ball-securing piece allows locking and releasing the retention in the groove of the retaining area, and where the longitudinal movement for releasing said securing piece is performed by the actuation element.

6. The spray gun according to claim 1 wherein the gun has a cartridge for each inlet of a component to mix in the mixing chamber piece, each cartridge having a friction bushing for said mixing chamber piece, and where said cartridge has an external surface accessible to the user with gripping and manual attachment elements in the working position.

7. The spray gun according to claim 1, wherein the mixing chamber piece has a beveled area or an area with a ramp that increases in size in the direction opposite to the longitudinal introduction to the operating position, displacing any mobile element placed in a path of the assembly of the mixing chamber piece.

8. The spray gun according to claim 1, wherein the gun has a removable head comprising at least: a structural casing for retaining the elements that act in the head and are subjected to pressure and which houses the mixing chamber piece; cartridges with friction bushings; and component inlet connections and/or coupling block, where said removable head disengages as an array from the body of the gun and wherein the structural casing has a system for assembly and attachment to the body of the gun.

9. The spray gun according to claim 8, wherein the removable head has a locking element for the working position of the removable head in the gun.

10. The spray gun according to claim 8, wherein the removable head has an assembly and attachment system to the body of the gun with a bayonet closure.

11. The spray gun according to claim 1 wherein, associated to each of the component inlets to the gun, the head has a cartridge with a filter and an anti-return system.

12. The spray gun according to claim 11, wherein the cartridge with a filter and an antireturn system provides direct access from the outside for the user by means of a removable closure that holds the array of the cartridge.

13. The spray gun according to claim 1, wherein union and assembly elements of at least the external access pieces of the gun, whether they form part of the body or the head, are of the same type and size.

14. The spray gun according to claim 1, wherein the head or the coupling block has multiple inlet connection in addition to those used for inlet of the components, which are removably plugged for potential use thereof.

15. Spray equipment of pressurized components of those using a storage system and a pumping system of the components to the gun, characterized in that the equipment comprises at least one spray gun as that indicated in claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0051] For the better understanding of the description made herein, a set of drawings has been provided wherein, schematically and solely by way of a non-limiting example, a practical case of an embodiment is portrayed.

[0052] FIG. 1 is a perspective view of the spray gun in its working position.

[0053] FIG. 2 is a side elevation cross-sectional view of the spray gun in its working position.

[0054] FIG. 3 is a front elevation cross-sectional view along the retaining element of the spray gun in its working position.

[0055] FIG. 4 is a front elevation cross-sectional view along the locking knob of the removable head of the spray gun in its working position.

[0056] FIG. 5 is an exploded view of the spray gun.

[0057] FIG. 6 is a perspective view of the gun with the head rotated and removed.

[0058] FIG. 7 is an exploded view of the cartridge with the friction bushings.

[0059] FIG. 8 is an exploded view of the cartridge with a filter and anti-return system.

[0060] FIG. 9 is a perspective view of the supply, pulverisation/projection equipment with the gun connected.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0061] Various embodiments of the spray gun for mixing components of the invention as well as the supply and projection/pulverisation equipment that it comprises are described below, with reference to the figures described above.

[0062] According to a preferred embodiment, as can be seen in FIGS. 1 to 3 and 5, the invention relates to a spray gun (10) used in a spray equipment (200) for projection of a mixture of two components, which when mixed and projected change their physical state. These components are supplied by a storage system (201) and pumped under pressure by a pumping system (202) to the gun (10).

[0063] The spray gun (10) works such that the components to mix enter under pressure at each of the inlets (18) arranged at the coupling block (36) so that, after each component passes through the corresponding cartridge (40) with a filter (41), when the user presses the trigger of the gun (10) said components enter the mixing chamber piece through the cartridges (15) with friction bushings (16), and the mixture exits through the opening of the mixing chamber piece (20) and through the diffuser (13). The coupling block (36), as well as the inlets (18), can alternatively have multiple inlet connections that are plugged.

[0064] In its working position the mixing chamber piece (20) moves in the housing of the structural casing (35) of the head (30), the displacement thereof being limited in the longitudinal sense by a retaining element (11) which prevents longitudinal displacement beyond a desired point, holding an area (21) adapted for retention.

[0065] This retaining element (11) is formed by a ball securing piece which, in said working position, is inserted in the groove formed by the retaining area (21). To release the mixing chamber piece (20) an actuation element (12) is provided in communication with the part that retains the balls in the position pressing against the groove of the retaining area (21). When this actuation element (12) is released and moves in a longitudinal sense it moves the part that retains the balls, allowing a retracted position of the balls with respect to the groove of the retaining area (21).

[0066] This end of the retention of the mixing chamber piece (20) must be preceded by a pressure release in the gun and a release of pressure on the cartridges (15) that contain the friction bushings (16), as well as the release of the attachment position of the diffuser (13).

[0067] With these previous safety actions and once the mixing chamber piece (20) is released by the user with the actuation element (12), the mixing chamber piece (20) is pushed slightly outwards along the longitudinal axis by a spring (14).

[0068] As the structural casing (35) has a configuration of the housing of the mixing chamber piece (20) that allows the free displacement of its entire geometry to the outside, the force exerted by the spring (14) means that the chamber part is exposed on the outside in the area of the diffuser (13), and can be removed from the gun (10) without disassembling any main piece.

[0069] In the present embodiment the previous release action of the pressure exerted by the friction bushing (16) is performed by the actuation on the cartridge (15) that contains this friction bushing (16), as it has an external gripping surface as can be seen in FIG. 7, where a screwing action allows releasing the pressure exerted by the friction bushing (16) against the mixing chamber piece (20).

[0070] To simplify the reinsertion of the mixing chamber piece (20) in the gun (10), said mixing chamber piece (20) has a bevelled surface (17) in its larger area with respect to the housing. Due to its shape this bevelled surface (17), when it meets an element placed in its path, such as the friction bushings (16), will move them towards the inside of their housing and thus allows inserting the mixing chamber piece (20) in its working position. In this position, if the actuator (12) is returned to its locking position the balls of the retaining element (11) will again enter the retaining area (21).

[0071] The gun (10) can be divided into two main pieces, a removable head (30) and a gun body (19), where the head (30) can be separated from said body (19), as can be seen in FIGS. 4 and 6. The head (30) comprises: [0072] a structural casing (35) that contains all the elements thereof, fixing the position thereof with its metallic structure and comprising a housing for placing and displacing the mixing chamber (20); [0073] the cartridges (15) with the friction bushings (16); and [0074] a coupling block (36) that includes the inlet connections (18) of each component and which contain the corresponding cartridges (40) with a filter (41) accessible from the outside, which alternatively can have an antireturn system (42) as can be seen in FIG. 8.

[0075] The removable head (30) has an assembly and attachment system (32) in the body (19) of the gun (10), comprising in the present embodiment a bayonet type closure system that is locked in the working position by a locking element (31).

[0076] The external access parts such as the various parts of the body (19) of the gun (10) or the head and the coupling block (36) have attachment screws that can be removed with a single tool as the coupling system for said screws is of the same type and shape.

[0077] Although reference has been made to a specific embodiment of the invention, it is clear to a person skilled in the art that the spray gun and the spray equipment including the gun described are susceptible to numerous variations and modifications, and that all the details mentioned can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the attached claims.