A connection mechanism for connecting a spray gun and a supply cup

Abstract

The application discloses a connecting mechanism for connecting a spray gun and a supply cup, a seal connecting piece is outwardly circumferentially extended, a side wall with uniform wall thickness is arranged on the circumferentially extended part, the side wall is outwardly circumferentially extended, the circumferential extension width of the seal connecting piece is greater than the wall thickness of the side wall, and the seal connecting piece, the side wall and the side wall form a part for connecting the supply cup. The specific structure of the double-ring side wall completely avoids the circular deformation of the connecting supply cup part in the injection molding process, guarantees that the connecting supply cup part can be tightly combined with the nozzle part of the supply cup, and the specific mode that the width of the upper ring surface and the lower ring surface is greater than the thickness of the side wall always forms a recess outside the side wall, greatly improves the strength of the connecting supply cup part, and the cost of the product is 1 / 5 to 1 / 4 of the cost of the metal connecting mechanism.

Description

Technical Field

[0001] This invention relates to the field of connecting spray guns and supply cups, and more particularly to a connecting mechanism for connecting spray guns and supply cups. Background Technology

[0002] In conventional paint spray guns, the gun body is connected to the paint container or other material supply cup. This connection typically uses a fixed connecting mechanism on the gun body. However, if the supply cup's connector changes, this connecting mechanism becomes unusable. Therefore, various types of split-type connecting mechanisms have emerged to extend the supply cup connection. Currently, the mainstream connecting mechanisms on the market are made of metal and plastic. Metal connecting mechanisms require machining, especially when machining the connection structure compatible with the supply cup, which requires electrical discharge machining (EDM). For example, to adapt to the spray cup connecting mechanism disclosed in Chinese Utility Model Patent No. 202120757691.5 ("Reservoir Cap, Spray Gun Reservoir Connecting Mechanism and Reservoir"), continuous EDM is required on the metal connecting structure, resulting in high manufacturing costs. Furthermore, since the connecting mechanism is made of metal and the spray cup is made of plastic, combining the two can easily damage the nozzle of the spray cup, reducing its lifespan. With technological advancements, injection-molded connecting mechanisms have emerged in the market. However, during the injection molding process, the circular shape that matches the nozzle of the spray cup, due to its relatively large thickness, causes a time difference in cooling between the inner and outer walls, resulting in ellipticization of the circle and a poor seal between it and the nozzle of the spray cup. Reducing the wall thickness of the circle, on the other hand, easily leads to an excessively thin outer wall, significantly reducing its strength, making the plastic connecting mechanism prone to breakage during the twisting process.

[0003] Therefore, existing technologies need further improvement and development. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a connecting mechanism for connecting the spray gun and the supply cup, so as to completely solve the deformation problem of the part connecting the supply cup during the injection molding process.

[0005] To solve the above-mentioned technical problems, the present invention includes:

[0006] A connecting mechanism for connecting a spray gun and a supply cup includes a sealing connector forming a fluid flow channel between the supply cup and the spray gun. The sealing connector extends circumferentially outward from its upper edge, and a sidewall of uniform thickness is provided on the circumferentially extended portion. The upper edge of the sidewall also extends circumferentially outward from its upper edge. The width of the circumferential extension of both the upper edge of the sealing connector and the upper edge of the sidewall is greater than the wall thickness of the sidewall. The upper edge of the sealing connector, the sidewall, and the upper edge of the sidewall together form a portion for connecting the supply cup.

[0007] The connecting mechanism wherein the side wall is provided with at least one opening, and the side wall corresponding to the opening is provided with a locking part adapted to the supply cup.

[0008] The connecting mechanism wherein two openings are provided on the side wall, and the two openings are arranged in an axially symmetrical manner on the side wall.

[0009] In the aforementioned connecting mechanism, the locking part is a protrusion on the inner side of the side wall, and the surface of the protrusion facing the upper edge of the sealing connector is a spiral wedge-shaped surface, an inclined surface, or a straight surface, and the length of the locking part is the same as the length of the opening.

[0010] In the aforementioned connecting mechanism, the upper surface of the sealing connector extending outward in a circumferential direction, the outer wall surface of the side wall, and the lower surface of the side wall extending outward in a circumferential direction form a "concave" structure, and a plurality of reinforcing ribs are evenly arranged in the "concave" structure.

[0011] The connecting mechanism is provided with at least one through-hole on the upper edge of the side wall, which is used to screw the connecting mechanism with a corresponding tool.

[0012] The connecting mechanism wherein two through-holes are provided on the circumference of the side wall, the two through-holes being located on the same straight line; the two through-holes form a through groove.

[0013] In the aforementioned connecting mechanism, the straight line containing the two through openings coincides with the diameter of the aforementioned circumference.

[0014] The connection mechanism wherein the sealing connector is provided with a mechanical connection feature adapted to the spray gun, the mechanical connection feature being a threaded or helical wedge element.

[0015] The connecting mechanism is integrally injection molded; the thickness of the sealing connector extending circumferentially outward along its upper edge and the thickness of the sidewall extending circumferentially outward along its upper edge are the same as the thickness of the sidewall.

[0016] This invention provides a connecting mechanism for connecting a spray gun and a supply cup. It adopts a specific structure with a double-ring sidewall, achieving uniform wall thickness and completely avoiding the circular deformation problem of the supply cup part during injection molding. This ensures that it can be tightly connected with the supply cup nozzle. Moreover, the specific method of the upper and lower ring surfaces being wider than the thickness of the sidewall always forms a recess on the outer side of the sidewall, which greatly improves the strength of the supply cup part. In particular, the cost of the product made by injection molding is extremely low. The cost of the product of this invention is one-fiftieth to one-fortieth of the cost of a metal connecting mechanism. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the connecting mechanism in this invention;

[0018] Figure 2 This is a schematic diagram of another embodiment of the connecting mechanism in this invention;

[0019] Figure 3 This is a schematic diagram of a third embodiment of the connecting mechanism in this invention;

[0020] Figure 4 for Figure 3 A schematic diagram of the central locking part. Detailed Implementation

[0021] This invention provides a connecting mechanism for connecting a spray gun and a supply cup. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] This invention provides a connecting mechanism for connecting a spray gun and a supply cup, such as... Figure 1 As shown, it includes a sealing connector 2 forming a fluid flow channel 1 between a supply cup and a spray gun. The upper edge of the sealing connector 2 extends circumferentially outward to form a first annular surface 3. A sidewall 4 with uniform wall thickness is provided on the circumferentially extended portion, i.e., the first annular surface 3. The upper edge of the sidewall 4 extends circumferentially outward to form a second annular surface 5. The circumferential width of both the upper edge of the sealing connector 2 and the upper edge of the sidewall 4 is greater than the wall thickness of the sidewall 4. That is, the widths of the first annular surface 3 and the second annular surface 5 are greater than the thickness of the sidewall 4, forming a "U" structure on the outer side of the sidewall 4. Furthermore, the sealing connector 2... The upper edge, side wall 4, and upper edge of side wall 4 form a part for connecting the supply cup. This part can be a snap-fit, or it can be directly engaged using the "U" structure formed by the first annular surface 3 and the second annular surface 5. Alternatively, a wedge-shaped block can be provided on the first annular surface 3 facing the second annular surface 5. Regarding the specific locking structure, corresponding settings can be made on the upper edge of side wall 4, the first annular surface 3, and the second annular surface 5. For example, the specific connection method disclosed in Chinese invention patent No. 201780006903.2, entitled "Push-lock Fluid Connector for Handheld Spray Gun," can also be applied to this invention. The connection process mainly requires adaptation to the mouth of the supply cup, and appropriate deformation can be made, which will not be elaborated further here. Furthermore, the thickness of the sealing connector 2 extending outward in a circumferential direction and the thickness of the side wall 4 extending outward in a circumferential direction are the same as the thickness of the side wall 4. In other words, the thickness of the first annular surface 3, the second annular surface 5 and the side wall 4 are the same. Moreover, the outermost edges of the first annular surface 3 and the second annular surface 5 are located on the same cylinder, which further reduces the stress response during injection molding and avoids deformation during the injection molding process.

[0023] Furthermore, such as Figure 2 As shown, the aforementioned side wall 4 is provided with at least one opening 6, and the side wall 4 corresponding to the opening 6 is provided with a locking part 7 adapted to the supply cup. For example, to cooperate with the spray cup connecting mechanism disclosed in Chinese Utility Model Patent No. 202120757691.5, entitled "Reservoir Cap, Spray Gun Reservoir Connecting Mechanism and Reservoir," the locking part 7 needs to be located on the inner side of the side wall 4. If a metal part is manufactured, it requires a cumbersome operation process, significantly increasing manufacturing costs. However, when using injection molding, the opening 6 can be easily demolded, and the shape of the locking part 7 can be kept unchanged. The locking part 7 and the spout of the supply cup are both made of plastic, resulting in a smoother fit and avoiding damage.

[0024] Furthermore, such as Figure 3 As shown, this embodiment is the optimal embodiment, with two symmetrically arranged locking parts 7 and corresponding through openings, making operation more convenient for the user. Specifically, the side wall 4 is provided with two openings 6, which are arranged axially symmetrically on the side wall 4, and a locking part 7 is provided at each opening 6. Moreover, as... Figure 4 As shown, the locking part 7 is a protrusion on the inner side of the upper edge of the side wall 4. The surface of this protrusion facing the upper edge of the sealing connector 2 is a spiral wedge-shaped surface. The length of the locking part 7 is the same as the length of the opening 6. Through the spiral wedge-shaped surface, the spout of the supply cup can be tightened more and more. A stop vertical piece 12 can also be provided at the end of the spiral wedge surface to prevent the spout of the supply cup from being over-tightened and falling off from the locking part 7. There are many ways to make the stop vertical piece 12, such as a straight line or an arc, which will not be described in detail here. Furthermore, the surface of this protrusion facing the upper edge of the sealing connector 2 can also be a slope or a straight surface, or other forms can be used.

[0025] Furthermore, such as Figure 1 and Figure 3 As shown, the upper surface of the sealing connector 2 extending circumferentially outward, the outer wall surface of the side wall 4, and the lower surface of the side wall 4 extending circumferentially outward form a concave structure 8. Several reinforcing ribs 9 are evenly arranged within this concave structure 8. This concave structure 8 is formed by the first annular surface 3, the second annular surface 5, and the outer wall surface of the side wall 4. This structure provides stability and increases the strength of the portion used to connect the supply cup, ensuring that it will not break during the user's tightening process.

[0026] Moreover, as Figure 3As shown, at least one through-hole 10 is provided on the upper edge of the aforementioned side wall 4, which is used to tighten the connecting mechanism with a corresponding tool. Furthermore, two through-holes 10 are provided on the circumference of the upper edge of the aforementioned side wall 4, and the two through-holes 10 are located on the same straight line; the two through-holes 10 form a through groove, and the straight line containing the two through-holes 10 coincides with the diameter of the aforementioned circumference. That is to say, a wrench or metal sheet can be inserted into the through groove, reducing wear on the connecting parts during operation. Moreover, the openings of the two through-holes 10 serve as support points, thereby achieving the purpose of leverage, allowing the operator to tighten the connecting parts more conveniently.

[0027] like Figure 3 As shown, the sealing connector 2 is provided with a mechanical connection feature 11 adapted to the spray gun. The mechanical connection feature 11 is a threaded or helical wedge element, and the connection mechanism of the present invention is integrally injection molded. In the above embodiments, the mechanical connection feature 11 is represented by a helical wedge element, but it needs to be determined according to the connection method of the spray gun, and will not be listed one by one here.

[0028] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A connection mechanism for connecting a spray gun and a supply cup, the connection mechanism being integrally injection molded, comprising a seal connector forming a fluid flow passage between the supply cup and the spray gun, characterized in that, The sealing connector extends circumferentially outward from its upper edge. A sidewall with uniform wall thickness is provided on the circumferentially extended portion. The upper edge of the sidewall extends circumferentially outward from its upper edge. The width of the circumferential extension of both the upper edge of the sealing connector and the upper edge of the sidewall is greater than the wall thickness of the sidewall. The upper edge of the sealing connector, the sidewall, and the upper edge of the sidewall together form a portion for connecting the supply cup. The sidewall is provided with at least one opening, and a locking part adapted to the supply cup is provided at the corresponding opening. The upper surface of the sealing connector extending circumferentially outward from its upper edge, the outer wall surface of the sidewall, and the lower surface of the sidewall extending circumferentially outward from its upper edge form a concave structure. A plurality of reinforcing ribs are evenly arranged in the concave structure.

2. The connection mechanism of claim 1, wherein, The aforementioned sidewall has two openings, which are arranged symmetrically on the sidewall.

3. The connection mechanism of claim 1, wherein The aforementioned locking part is a protrusion on the inner side of the side wall. The surface of the protrusion facing the upper edge of the sealing connector is a spiral wedge-shaped surface, an inclined surface, or a straight surface. The length of the locking part is the same as the length of the opening.

4. The connection mechanism of claim 1, wherein At least one through-hole is provided on the upper edge of the aforementioned side wall, which is used to screw the connecting mechanism with a corresponding tool.

5. The connection mechanism of claim 4, wherein, Two through-holes are provided on the circumference of the upper edge of the side wall, and the two through-holes are located on the same straight line; the two through-holes form a through groove.

6. The connection mechanism of claim 5, wherein, The straight lines containing the two through holes coincide with the diameter of the aforementioned circle.

7. The connection mechanism of claim 1, wherein The aforementioned sealing connector is provided with a mechanical connection feature adapted to the spray gun, which is a threaded or helical wedge element.

8. A connection mechanism according to any one of claims 1-7, characterized in that The thickness of the sealing connector extending circumferentially outward from the upper edge and the thickness of the sidewall extending circumferentially outward from the upper edge are the same as the thickness of the sidewall.

Images