Quick coupling device for spray guns

Abstract

Quick coupling device for spray guns, comprising: a coupling sleeve (10) provided with an upper connection section (11), a sliding sleeve (13), a first spring (14), a second spring (141), a slider (17), a sealing ring (19), and a sealing ring (18), wherein a positioning base (12) is formed at the lower end of the upper connection section (11), and a fluid channel (201) is provided inside the upper connection section (11), and wherein the first spring (14) is arranged between the sliding sleeve (13) and the upper connection section (11), one side of the first spring (14) abuts against the sliding sleeve (13), and the sliding sleeve (13) compresses the first spring (14) by displacement, and wherein the slider (17) and the second spring (141) are arranged in the upper connection section (11), and wherein the slider (17) abuts against the second spring (141), wherein the Sealing ring (19) is provided in a ring shape on the outside of the slide (17),to seal the coupling sleeve (10) against leakage, and wherein the sealing ring (18) is provided in an annular manner on the inside of the positioning base (12) to seal the coupling sleeve (10); , a coupling plug (20) provided with a plug connection (21) and a lower connection section (22), wherein the plug connection (21) and the lower connection section (22) are each provided at opposite ends of the coupling plug (20), wherein a fluid channel (201) is formed inside the plug connection (21) and the lower connection section (22), wherein a circumferential groove (23) is formed on the outer edge of the plug connection (21), wherein an inclined surface is provided on the inside of the sliding sleeve (13), and wherein a plurality of balls (15) are arranged in a ring shape between the inclined surface and the positioning base (12) in such a way that when the coupling sleeve (10) is connected to the coupling plug (20), the inclined surface is acted upon by spring force and the balls (15) snap into the groove (23).

Description

The present invention relates to a coupling device, in particular a quick coupling device for spray guns, which enables a quick disconnection and a simple dismantling of the connection.Spray guns are devices that produce rapid release using liquids or compressed air as the motive means and are commonly used for spraying or cleaning. The liquid to be sprayed is generally stored in a cleaning container. If the liquid located in the cleaning container has been used up, the cleaning container must be replaced by a new one.The replacement of the cleaning container requires, in conventional embodiments, the detachment of the connecting device between the cleaning container and the spray gun. This connecting device must be released with a tool-generally a wrench. This process is time-consuming and requires a certain amount of force. In particular in the cleaning of larger surfaces, in which the cleaning container must be frequently exchanged, this leads to a considerable restriction in handling and efficiency.At present, no method is known which enables rapid replacement of the cleaning container. Against this background, the inventor has intensively expanded with the problem and, taking into account quick coupling devices, has developed a solution which combines the advantages of rapid separation and simple release. Thus, the quick coupling device for spray guns has been successfully designed.The utility model is based on the object of providing a quick coupling device for spray guns which enables a quick separation and a simple dismantling of a cleaning container.This object is achieved by a quick coupling device for spray guns, which has the features specified in claim 1. Further advantageous embodiments of the invention are evident from the features of the dependent claims.According to the invention, there is provided a quick coupling device for spray guns, comprising a coupling sleeve having an upper connection portion, a sliding sleeve, a first spring, a second spring, a slide, a sealing ring and a sealing ring. A positioning base is formed at the lower end of the upper connection section, and a liquid channel is provided in the interior, which allows liquid or gas to pass through inside the coupling sleeve. The first spring is arranged between the displacement sleeve and the upper connection section. Its front end is in contact with the displacement sleeve, so that when the sleeve is displaced, the first spring is compressed. The slider and the second spring are disposed inside the upper terminal portion, the slider abutting against the second spring and moving along the axial direction of the terminal portion according to deformation of the spring. The sealing ring is provided annularly on the outer side of the slide and serves for sealing, while the sealing ring is arranged annularly on the inner side of the positioning base. The quick-action coupling device further comprises a coupling plug having a plug connection and a lower connection section. The male terminal and the lower terminal portion are disposed at opposite ends of the male connector. In the interior of these two sections, a hollow channel is formed through which liquid or gas can be passed. The sealing ring on the outside of the slide serves to seal against the coupling plug, while the sealing ring in the region of the positioning base assists in sealing the connection.According to the invention, a circumferential groove is provided on the outer surface of the plug connection. The inside of the sliding sleeve is provided with an inclined surface. Between this inclined surface and the positioning base, a gap is formed in which a plurality of balls are annularly arranged. If the coupling plug is connected to the coupling sleeve, the spring forces press the inclined surface against the balls, so that the latter engage in the groove and secure the connection.According to the invention, the outer side of the displacement sleeve is provided with a non-slip section which enables a secure gripping during the actuation of the coupling sleeve.According to the invention, the outer side of the upper connecting portion is formed in a hexagonal shape, so that the coupling sleeve is easily rotatable by means of a wrench.According to the invention, a hexagonal nut is fixedly attached to the lower end of the lower terminal portion, whereby the coupling plug can also be connected or disconnected by manual operation or with a tool.The upper terminal portion may be provided with either an internal thread or an external thread.The lower connection portion can have either an internal thread or an external thread.In summary, the quick coupling device enables a quick separation and simple dismantling between the spray gun and the cleaning container and thus contributes to an increase in the cleaning efficiency.The utility model and its embodiments are explained in more detail below with reference to the figures. The figures show: FIG. 1 is a perspective view of the quick coupling device for spray guns; FIG. 2 is an exploded view of the individual parts of the quick coupling device; FIG. 3 is a schematic illustration of the coupling sleeve and the coupling plug of the quick coupling device; FIG. 4A is a sectional view of the coupling sleeve and the coupling plug of the quick coupling device in the separated state; FIG. 4B is a sectional view of the coupling sleeve and the coupling plug of the quick coupling device in the connected state; and FIG. 5 shows an application illustration of an exemplary embodiment of the quick coupling device in use with a spray gun and a cleaning container.Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail in order to make advantages and features of the present invention understood by those skilled in the art and to enable the technical contents to be realized.It should be noted that directional references such as "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. used in the description of the exemplary embodiment of the present invention refer to the orientations and positions illustrated in the figures. These details are used exclusively for better comprehension of the description and for simplification of the representation of the exemplary embodiment. However, they do not represent a limitation with regard to a specific spatial orientation or arrangement of the described device or its components and must not be construed as such.As shown in Fig. 1, a quick coupling device for spray guns comprises a coupling sleeve (10) and a coupling plug (20).As shown in FIGS. 2 and 3, the coupling sleeve 10 has an upper connection section 11, a displacement sleeve 13, a first spring 14, a second spring 141 and a slide 17. At the lower end of the upper terminal portion 11, a positioning base 12 is formed. In the interior of the upper connection section 11, a liquid channel 201 is provided, which serves for the passage of liquid or gas inside the coupling sleeve 10. The sliding sleeve 13 is slidably disposed on the outer edge of the positioning base 12 and is capable of sliding along the axial direction of the positioning base 12. The first spring 14 is arranged between the displacement sleeve 13 and the upper connection section 11. When the sliding sleeve 13 is slid by the user, the first spring 14 is compressed and deformed, whereby when the spring 14 is compressed, the sliding sleeve 13 is returned to its original position. The slider 17 and the second spring 141 are disposed inside the upper terminal portion 11. One side of the slider 17 abuts against the second spring 141, while the other side of the second spring 141 abuts against the inner wall of the upper terminal portion 11.The male connector 20 includes a male terminal 21 and a lower terminal portion 22 provided at opposite ends of the male connector 20, respectively. A liquid channel 201 is formed in the interior of the plug connection 21 and the lower connection section 22, said liquid channel serving for the passage of liquid or gas inside the coupling plug 20.On the outer edge of the plug connection 21, a circumferential groove 23 is formed. The inside of the sliding sleeve 13 is provided with an inclined surface [not shown]. Between the inclined surface and the positioning base 12, a plurality of balls 15 are annularly arranged.On the outside of the sliding sleeve 13 there is provided a non-slip section 16 which improves gripping by increasing the friction and thus facilitates the separation or connection of the coupling sleeve 10 to the coupling plug 20.As shown in FIGS. 4A and 4B, the coupling sleeve 10 has a sealing ring 18 and a sealing ring 19. The seal ring 18 is annularly disposed on the inner side of the positioning base 12, while the seal ring 19 is annularly disposed on the outer side of the slider 17. When the coupling sleeve 10 and the coupling plug 20 are in the separated state, the first spring 14 is compressed, while the second spring 141 is not compressed. In this state, the liquid passage is interrupted, so that no medium can flow through. If the coupling sleeve 10 and the coupling plug 20 are in the coupled state, the second spring 141 is compressed, while the first spring 14 is no longer compressed. In this state, the liquid channel in the coupling plug 20 forms a continuous passage through which liquid or gas can flow.When the coupling plug 20 is assembled or disassembled with the coupling sleeve 10, the following steps are carried out: 1. the male terminal 21 of the coupling plug 20 is inserted into the upper terminal portion 11 of the coupling sleeve 10. 2. by the exertion of a slight pressure, the plug connection 21 abuts against the slide 17 located within the coupling sleeve 10, whereby the second spring 141 is compressed. At the same time, the balls 15 press into the circumferential groove 23 on the male terminal 21, so that the male terminal 21 is firmly held in the positioning socket 12. This produces a stable connection between coupling sleeve 10 and coupling plug 20. 3. To separate the coupling sleeve 10 from the coupling plug 20, the displacement sleeve 13 is axially displaced, thereby compressing the first spring 14. At this moment, the balls 15 disengage from the groove 23, so that the second spring 141 springs back, pushes the slide 17 forward and presses it again against the coupling plug 20. This disconnects the coupling plug 20 from the coupling sleeve 10.FIG. 5 shows an application of an embodiment of the quick coupling device for a spray gun. The quick coupling device is used as a connecting element in a spray gun arrangement, wherein the upper connection section 11 is connected to the tubular body of the spray gun 30 and the lower connection section 22 is coupled to a cleaning container 40. If the cleaning container 40 is to be changed, the coupling plug 20 can be easily separated from the coupling sleeve 10. The cleaning container 40 can thereby be easily removed and the replacement container can be connected quickly and easily by means of the quick coupling device.It can be seen from FIG. 2 that the upper connection section 11 has an external hexagonal structure which facilitates the use of a wrench or manual actuation for the user. As a result, the coupling sleeve 10 can be separated from the tubular body of the spray gun 30 in a particularly simple and force-saving manner or can be connected thereto.Likewise, a fixedly attached hexagonal nut is provided in the region between the lower connection section 22 and the plug connection 21. This allows the user to also connect or disconnect the lower connection portion 22 to the cleaning container 40 with a wrench or manually, which further facilitates handling.The upper connection section 11 is connected via a thread to the tubular body of the spray gun 30. This can be formed as an external thread [not shown] or as an internal thread 111. Correspondingly, the lower connection section 22 also has a threaded connection to the cleaning container 40, which can be embodied either as an external thread 221 or as an internal thread-not shown in the drawing.The above-described embodiment is merely an exemplary embodiment of the present invention, and should not be construed as limiting the scope thereof. Various modifications and further developments are conceivable for those skilled in the relevant technical field, which are based on the disclosed technical features. As long as these changes do not depart from the technical spirit defined by the claims, they also fall within the scope of the present invention.List of reference characters10 Coupling sleeve 11 Upper connecting section 111 Internal thread 12 Positioning base 13 Displacement sleeve 14 First spring 141 Second spring 15 Ball 16 Non-slip section 17 Slide 18 Sealing ring 19 Sealing ring 20 Coupling plug 201 Liquid channel 21 Plug connection 22 Lower connecting section 221 External thread 23 Groove 30 Spray gun 40 Cleaning container

Claims

A quick coupling device for spray guns, comprising: a coupling sleeve (10) provided with an upper connection portion (11), a sliding sleeve (13), a first spring (14), a second spring (141), a slider (17), a sealing ring (19), and a sealing ring (18), wherein a positioning base (12) is formed at the lower end of the upper connection portion (11), and a liquid channel (201) is provided inside the upper connection portion (11), and wherein the first spring (14) is disposed between the sliding sleeve (13) and the upper connection portion (11), a side of the first spring (14) abuts on the sliding sleeve (13), and the sliding sleeve (13) compresses the first spring (14) by sliding, and wherein the slider (17) and the second spring (141) are disposed in the upper connection portion (11), and wherein the slider (17) abuts against the second spring (141), wherein the sealing ring (19) is annularly provided on the outside of the slider (17) to seal the coupling sleeve (10) against leakage, and wherein the sealing ring (18) is annularly provided on the inside of the positioning base (12) to seal the coupling sleeve (10); a coupling plug (20) provided with a plug port (21) and a lower port portion (22), the plug port (21) and the lower port portion (22) being provided at opposite ends of the coupling plug (20), respectively, a liquid passage (201) being formed inside the plug port (21) and the lower port portion (22), a circumferential groove (23) being formed on the outer periphery of the plug port (21), an inclined surface being provided on the inner side of the sliding sleeve (13), and a plurality of balls (15) being annularly arranged between the inclined surface and the positioning base (12) such that when the coupling sleeve (10) is connected to the coupling plug (20), the inclined surface is spring-biased and the balls (15) snap into the groove (23).Quick-coupling device for spray guns according to claim 1, characterised in that a non-slip section (16) is formed annularly on the outer side of the displacement sleeve (13), which enables a comfortable and secure gripping.Quick-action coupling device for spray guns according to claim 1, characterised in that the outer side of the upper connection section (11) is designed as a hexagonal structure, so that the coupling sleeve (10) can be rotated by means of a wrench.Quick-action coupling device for spray guns according to Claim 1, characterized in that a fixedly mounted hex nut is provided in the region of the connection between the lower connection section (22) and the plug connection (21), said hex nut enabling the coupling plug (20) to be actuated with a wrench.The quick coupling device for spray guns according to claim 1, characterized in that the upper fitting portion (11) is provided with a thread selected from a group consisting of an internal thread (111) and an external thread.The quick coupling device for spray guns according to claim 1, characterized in that the lower connecting portion (22) is provided with a thread selected from a group consisting of an external thread (221) and an internal thread.

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