Jet tip holder for airless spray gun

Abstract

A spray tip holder for an airless spray gun has a body, a nut, a tip interface mounted with the body and having a first cylindrical section designed to fit onto the spray gun and a second cylindrical section perpendicular to the first cylindrical section and designed to receive a spray tip, characterized in that the second cylindrical section of the tip interface comprises a first inlet for the spray tip and a second inlet located opposite the first inlet and designed to receive the spray tip, and in that the body comprises a first shoulder located at the first inlet and defining a first distance between the first shoulder and the axis of the first cylindrical section, and a second shoulder located at the second inlet and defining a second distance between the second shoulder and the axis of the first cylindrical section.

Description

Technical Field

[0001] This invention generally relates to fluid spraying systems. More specifically, it relates to a spray tip holder designed to be mounted on a spray gun and to receive the spray tip. Fluid spraying systems are commonly used in a wide variety of applications, from various industrial assemblies to home painting. Handheld sprayers can be used by human operators, while automatic sprayers are typically used in mechanized manufacturing processes. In the painting field, replaceable spray tips are commonly used to accommodate desired paint types, coating finishes, and spray patterns. Background Technology

[0002] Airless sprayers pump and pressurize paint without using air. The paint is then supplied through small orifices (called orifices) within the spray nozzle at pressures up to 530 bar / 7700 psi. This process atomizes the paint with controlled fan width and flow rate. The spray nozzle size and airless pump pressure determine the flow rate of the paint material. The spray nozzle, particularly the nozzle assembly, also produces the fan pattern, spray angle, and spray volume.

[0003] During painting operations, the spray tip should be changed frequently to obtain the correct finish, surface coverage, and coating thickness for a specific application. Use of the spray tip leads to wear, and the spray pattern tends to change over time. This is why spray guns (especially spray tip holders) are designed to receive replaceable spray tips. The spray tip comprises a nozzle carrier, which includes a nozzle assembly that defines the spray pattern as fluid passes through it. As the nozzle carrier rotates to the spray position, pressurized fluid (typically paint) is forced forward through the nozzle assembly and exits at high speed along the central longitudinal axis of the nozzle assembly.

[0004] The spray tip retainer includes a body, typically made of rigid plastic (polyamide PA66, ABS, etc.) and having two perforated winds, a tip interface for receiving a replaceable tip, and a nut for securing the spray tip retainer to the spray gun. The tip interface includes a cylindrical portion with a through-channel, one side of which contacts the spray gun, and the other side is a hollow cylinder with an inner diameter substantially equal to the outer diameter of the spray tip, allowing a second section of the tip interface to fit snugly around the spray tip. The body includes a shoulder for guiding the spray tip through the hollow cylinder, such that the nozzle of the spray tip is centered on the through-channel of the tip interface. Summary of the Invention

[0005] One issue is the wide variety of spray tips available on the market. Spray tips are defined by their diameter, nozzle type, and the distance between the nozzle's axis and a tab. The tab's function is to ensure proper insertion into the spray tip holder, aligning the nozzle with the axis of the tip interface. The distance between the tab and the nozzle's axis can vary depending on the manufacturer. Similarly, the diameter can also vary. This is one way spray gun manufacturers limit the possibility of customers purchasing compatible spray tips. It should be noted that spray tips are frequently replaced parts, therefore the market for spray tips is highly competitive, with a large selection available from various manufacturers.

[0006] A first solution was proposed to address the varying distances between the nozzle tip and the nozzle axis by providing different spacers. The tip itself is manufactured for longer distances, and if the spray tip retainer is designed for shorter distances, spacers (or multiple spacers) in the form of rings or washers slide into the nozzle carrier to adjust the length to the correct position. It is easy to imagine the difficulty in an industrial environment or construction site in determining which type of spray tip retainer a user is currently using and, consequently, the correct spacers to use and slide around the nozzle carrier.

[0007] The following invention proposes a spray tip retainer for a spray gun, having a body, a nut, and a tip interface mounted to the body and having a first cylindrical section and a second cylindrical section. The first cylindrical section is designed to fit onto the spray gun, and the second cylindrical section is perpendicular to the first cylindrical section and designed to receive the spray tip. The second cylindrical section includes a first inlet for the spray tip and a second inlet positioned opposite the first inlet and designed to receive the spray tip. The body includes a first shoulder and a second shoulder. The first shoulder is located at the first inlet and defines a first distance between the first shoulder and the axis of the first cylindrical section, and the second shoulder is located at the second inlet and defines a second distance between the second shoulder and the axis of the first cylindrical section.

[0008] Using this design, the jet tip retainer can receive two different jet tips with different characteristics (such as different distances between the nozzle axis and the protrusion). Attached Figure Description

[0009] The invention will be better understood with the aid of the accompanying drawings, namely:

[0010] - Figure 1 A view of the first section of the jet tip retainer, having the tip interface, is shown.

[0011] - Figure 2 Two different jet tips with different distances between the nozzle axis and the flange are shown.

[0012] - Figure 3 A perspective view of the jet tip retainer is shown.

[0013] - Figure 4 The front view shows two different jet tips.

[0014] - Figure 5 A side view of two different jet tips is shown. Detailed Implementation

[0015] The spray tip retainer consists of three main parts (see...) Figure 1 The main body (1a, 1b) is typically made of PA66 / ABS and includes two wings (1a) for preventing injury to the user during spraying and a section (1b) for receiving the top interface. The top interface, typically made of stainless steel or brass, is assembled with the main body to form a single component. The top interface comprises two sections, a first section and a second section. The first section is adapted to be mounted on the spray gun and has a first cylindrical section terminating on a flat surface (applied to the spray gun). The second section is a second cylindrical section orthogonal to the first section. The first cylindrical section is hollow, allowing paint to be pushed by the spray gun through the top interface to terminate at the spray tip. The second cylindrical section... Figure 1 As can be seen on element 3, a cylindrical channel is formed for the spray tip. The second section has an opening located at the axis of the first section, allowing high-pressure paint to be delivered to the spray tip. The body is used to properly guide the spray tip into the second cylindrical section. A shoulder (4) is formed in the body to stop the insertion of the spray tip when the nozzle of the spray tip is aligned with the axis of the first cylindrical section of the tip interface.

[0016] The final part of the spray tip retainer is the nut (5) used to secure the spray tip retainer to the spray gun. It should be noted that the nut may have a grooved, knurled, or hexagonal exterior to allow the spray tip retainer to be secured to the gun using a wrench. Alternatively, a plastic sleeve (PA66) can slide around the nut so that the user can tighten the nut to the spray gun by hand.

[0017] The main feature of the jet tip retainer of the present invention is in the body. In known solutions, the body has an opening that allows the jet tip to enter the tip interface, and the opposite side is closed.

[0018] Figure 2 The invention is illustrated, wherein the body has two openings positioned opposite each other. This allows for the introduction of jet tips on both sides of the body.

[0019] The main advantage of having two openings is that it can accommodate two different jet tips with different physical dimensions (e.g., different nozzle carrier lengths and diameters). Figure 2 Above, the left injection tip (A) has a first distance D1 between the protrusion (4a) and the nozzle axis (5a). The body of the injection tip holder includes a first shoulder (see...). Figure 1 (element 4), the first shoulder is shaped such that the distance between the flat surface of the shoulder and the axis (6) of the first cylindrical section of the top interface is equal to the distance D1.

[0020] Similarly, the right jet tip (B) has a second distance D2 between the tab (4b) and the nozzle axis (5b). The body of the jet tip holder includes a second shoulder on the opposite side of the first shoulder of the body, which is shaped such that the distance between the flat surface of the second shoulder and the axis (6) of the first cylindrical section of the tip interface is equal to the distance D2. Obviously, the distance D1 is different from the distance D2.

[0021] Therefore, the main body of the jet tip holder of the present invention is asymmetrical, and the distance between the first shoulder (4) on one side of the main body and the axis (6) of the tip interface is different from the distance between the second shoulder on the opposite side of the main body and the axis (6) of the tip interface.

[0022] Figure 3 This is a perspective view of the jet tip retainer. The first opening (3) is visible on one side of the body, and we can also see the second opening (7) on the other side of the body. Figure 1 and Figure 3 Above, only one shoulder (4) is visible, but around the second opening (7) on the main body. Figure 3 It has a similar shoulder. The shoulder defines the penetration of the jet tip into the body.

[0023] Figure 4 and Figure 5 Two different spray tips are shown side by side. The distances between the protrusions (4a, 4b) of the spray tips and the axes (5a, 5b) of the nozzles are different. Therefore, the nozzles (6a, 6b) of each spray tip are located at different distances, which was originally designed for different spray tip holders. Using the body proposed in this invention, these spray tips can be used in the same spray tip holder.

[0024] As previously described, the shoulder serves to guide the spray tip during its introduction into the spray tip holder. The spray tip includes tabs (4a, 4b) to stop the introduction of the nozzle carrier into the first cylindrical section of the tip interface. When the tabs are pushed to a stop by the shoulder, the axis of the nozzle is aligned with the axis of the first cylindrical section, and the spray gun is ready for operation.

[0025] Various operating modes of the shoulder can be proposed to assist the operator in daily work. In a first embodiment, the shoulder has a circular shape suitable for receiving a protrusion in the form of a ring. The spray tip can rotate freely in place and remain in contact with the shoulder of the body.

[0026] In another embodiment, the shoulder (4) includes a grooved section (2) that engages with a corresponding tab at the tip of the jet.

[0027] exist Figure 2 and Figure 3 In the example, the jet tip includes protrusions (4a, 4b) that are quarter-rings. The groove (2) has a larger cross-section only in the small segment, thus allowing the protrusions to fully enter the body and contact the shoulder. The rotation of the jet tip is guided by the groove, thus allowing 90-degree rotation on both sides. Therefore, the groove allows the protrusions to rotate 180 degrees.

[0028] One side of the rotation corresponds to the spray position, and the other side of the rotation corresponds to the cleaning position at the spray tip.

[0029] It should be noted that once the spray tip is rotated to either side, it cannot be removed because the tab engages in the groove. The shape of the groove helps the user to position the spray tip perfectly aligned with the axis of the tip interface.

[0030] In many cases, the jet tips have different diameters. Because the second section of the jet tip holder of the present invention has a larger diameter than existing tip holders, a wide selection of different jet tips with different diameters can be inserted into either side of the jet tip holder.

Claims

1. A spray tip retainer for an airless spray gun, comprising a body (1a, 1b), a nut (5), and a tip interface, the tip interface being mounted to the body (1b) and having a first cylindrical section and a second cylindrical section, the first cylindrical section being designed to fit onto the spray gun, and the second cylindrical section being perpendicular to the first cylindrical section and designed to receive the spray tip, characterized in that, The second cylindrical section of the top interface includes a first inlet for spraying a tip and a second inlet positioned opposite the first inlet and designed to receive the spraying tip, and the body includes a first shoulder and a second shoulder, the first shoulder being located at the first inlet and defining a first distance between the first shoulder and the axis of the first cylindrical section, and the second shoulder being located at the second inlet and defining a second distance between the second shoulder and the axis of the first cylindrical section.

2. The jet tip retainer according to claim 1, wherein the first distance is different from the second distance.

3. The jet tip retainer according to claim 1 or 2, wherein at least one shoulder includes a groove to engage with a tab of the jet tip and restrict rotation of the tab to 180 degrees.

4. The jet tip retainer according to any one of claims 1 to 3, wherein the diameter of the second cylindrical section is designed to receive a jet tip of a larger diameter.

5. The spray tip retainer according to any one of claims 1 to 4, wherein the nut comprises a plastic sleeve that is slidable around the nut so that a user can manually tighten the nut onto the spray gun.

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