Patent Application
20110240764
An exemplary fluid sprayer comprises a spray-coating system having a device configured to spray fluid material (e.g., paint, ink, varnish, stain, texture, herbicides, pesticides, food products, etc.) through the air onto a surface. The fluid material is typically provided from a fluid container by a fluid intake assembly. Fluid intake assemblies can use pressure feed, gravity feed, and/or suction feed mechanisms, for example. In one exemplary airless paint spraying system, a suction tube assembly extends into a paint container to provide paint material to a pump mechanism of a handheld fluid sprayer, which delivers pressurized paint to an output nozzle or tip.
Examples of paint containers include containers attached to a body of a paint sprayer and remote containers that are physically separated from the paint sprayer. For instance, an exemplary suction tube assembly for use with a remote paint container comprises a suction set having one or more tube fittings for inlet and/or return tubes. The inlet and/or return tubes extend from the suction set of the paint sprayer to the remote paint container and have a length sufficient to allow movement of a user about a work site, for instance. Tube lengths often reach several feet or more.
The discussion above is merely provided for general background information and is not intended to be used as an aid in determining the scope of the claimed subject matter.
The present disclosure generally relates to fluid spraying devices and systems and more specifically, but not by limitation, to a fluid intake assembly configured to be used with a remote fluid source to supply fluid material from the remote fluid source to a fluid sprayer.
In one exemplary embodiment, a fluid intake assembly for a fluid sprayer is provided. The assembly includes an inlet tube providing at least a portion of a fluid path between a remote fluid source and the fluid sprayer. The assembly also includes a fluid flow control mechanism configured to allow a flow of fluid material in the fluid path in a first direction and restrict a flow of fluid material in the fluid path in a second, opposite direction.
In one exemplary embodiment, a dual tube connection assembly for a fluid sprayer is provided. The assembly includes a first fitting configured to receive an inlet fluid tube providing at least a portion of an inlet fluid path from a remote fluid container to the fluid sprayer. The assembly also includes a second fitting configured to receive a return fluid tube providing at least a portion of a return fluid path from the fluid sprayer to the remote fluid container. The assembly also includes a valve mechanism configured to control a flow of fluid in the inlet fluid path.
In one exemplary embodiment, a fluid sprayer is provided and includes a fluid sprayer body, a motor configured to actuate a fluid pump mechanism, and a dual tube connection assembly coupled to a portion of the fluid sprayer body. The dual tube connection assembly is configured to receive an inlet fluid tube providing an inlet fluid path from a fluid container and a return fluid tube providing a return fluid path to the fluid container. The dual tube connection assembly includes a valve mechanism configured to allow a flow of fluid through the inlet fluid path in a first direction and restrict a flow of fluid through the inlet path in a second, opposite direction.
These and various other features and advantages will be apparent from a reading of the following Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the background.
Spray gun 100 illustratively comprises an airless system and uses a pump mechanism for pumping the paint material from a paint source. In other embodiments, spray gun 100 can comprise an air-driven or air-assisted system. In one embodiment, the paint source comprises a fluid container attached to spray gun 100. In the embodiment illustrated in
Spray gun 100 includes a housing 104 containing electrical components for controlling operation of spray gun 100 and an electric drive or motor operably coupled to drive a pump mechanism. The pump mechanism delivers paint supplied from container 102 to an output nozzle 106 having a particular size and shape for generating a desired spray pattern.
A fluid intake assembly 110 provides paint from remote container 102 to housing 104. In the embodiment illustrated in
Assembly 110 comprises a dual tube connection assembly 122 having a first fitting 124 configured to receive suction tube 116 and a second fitting 126 configured to return tube 118. Dual tube connection assembly 122 is removably couplable to a portion 108 of spray gun 100. In one embodiment, connection assembly 122 is coupled to portion 108 using threaded connections (e.g., portion 108 comprises a rotatable collar having threads configured to engage corresponding threads on connection assembly 122). In other embodiments, connection assembly 122 is coupled to portion 108 using any suitable type(s) of connection mechanisms including, but not limited to, latches, clamps, clasps, pins, snaps, and the like. In one embodiment, connection assembly 122 is interchangeable with other types of connection components. For instance, connection assembly 122 can be removed and replaced with a connection assembly for use with fluid containers that are directly attached to spray gun 100. By way of example, portion 108 can comprise a fluid container cover to which a fluid container is removably couplable. Cover 108 is supported by housing 104 and/or motor/pump assembly disposed within housing 104.
Spray gun 100 also includes handle 112 and trigger 114 that enable a user to hold and control the operation of spray gun 100. A power source (not shown in
During operation, when the fluid pump mechanism slows or stops (for example, when the user releases trigger 114) suction in the inlet tube 116 is reduced. The weight of the fluid material in the inlet tube 116 can cause the fluid material to flow back toward the fluid container 102 (especially with a long inlet tube 116). This flow of fluid material toward the fluid container 102 can result in air being drawn into assembly 122 and/or inlet tube 116 from sprayer 100 (for example, through the nozzle and/or pump mechanism of the fluid sprayer 100). In airless fluid spraying systems and the like, air within the fluid flow can cause sputtering or spitting of the paint material and uneven spray from the output nozzle. Such results are undesirable to the user. In accordance with embodiments described below, a dual tube connection assembly is provided including one or more fluid flow control mechanisms, such as a valve mechanism, configured to prevent or limit air from being drawn into the inlet fluid path.
Body 230 includes a first tube or conduit 240 providing an inlet fluid flow (generally represented by arrow 242) into spray gun 100 and a second tube or conduit 244 receiving a return fluid flow (generally represented by arrow 246) from spray gun 100. The inlet fluid flow 242 comprises fluid material received from a remote fluid container through suction tube 116 and the return fluid flow comprises fluid material returned to the remote fluid container through return tube 118. Tubes 240 and 244 extend from a top surface 248 of body 230 toward the spray gun 100. In one embodiment, tubes 240 and 244 are received within corresponding ports formed in spray gun 100.
First and second tube fittings 224 and 226 are configured to accommodate suction tube 116 and return tube 118, respectively. In one embodiment, one or more of tube fittings 224 and 226 comprise barbs or ribs 250 to retain the corresponding tube(s) thereon. In the illustrated embodiment, fitting 224 comprises a plurality of radially protruding frusto-conical barbs or ribs that engage the inner surfaces of suction tube 116. Alternatively, or in addition, fasteners such as clamps and the like can be utilized to secure tubes 116 and/or 118.
In the illustrated embodiment, tube fitting 224 comprises a portion of a coupler 252 that is removably attachable to body 230. Coupler 252 comprises a female receptacle or socket 254 having threads 256 configured to accommodate threads 258 of a corresponding male connector 260 of body 230. Connector 260 extends from the bottom surface 238 of body 230 and is configured to receive coupler 252 thereon.
In accordance with one embodiment, dual tube connection assembly 222 comprises a valve mechanism 262 positioned in the inlet fluid flow path (i.e., the fluid flow path formed by suction tube 116, coupler 252, connector 260, and tube 240). Valve mechanism 262 is configured to regulate a flow of fluid material through assembly 222 and is retained in an inner chamber or compartment 264 formed in connector 260 by coupler 252. Examples of valve mechanism 262 include, but are not limited to, check valves, flat valves, ball valves, reed valves, and the like. In the illustrated embodiment, valve mechanism 262 comprises a duckbill valve that is configured to allow fluid material to flow through the inlet fluid path in a first direction (generally represented by arrow 266) and restrict or prevent fluid flow in a second direction (generally represented by arrow 268).
In the illustrated embodiment, valve mechanism 262 includes an annularly extending portion 270 having a first surface 272 configured to engage a surface 274 of connector 260 and a second surface 276 configured to engage a surface of coupler 252. This engagement of surfaces 272 and 276 to connector 260 and coupler 252 can limit or prevent leakage of fluid material around valve mechanism 262.
During use of spray gun 100, a user ceases or suspends operation by releasing trigger 114. For instance, the user releases trigger 114 when coming to the end of a work surface (i.e., the end of a wall, the edge of a window or door, etc.). In another instance, the user stops operation of spray gun 100 to refill the fluid container, for example in response to a low fluid level indication. Preferably, operation of spray gun 100 is stopped to refill the fluid container before the amount of fluid material in the container falls below a level where the inlet end of the suction tube is exposed to air. In one example, a fluid level indicator is provided on spray gun 100 indicating to the user that the fluid level in the container is at or below a threshold level. One example of a fluid level indicator is described in commonly assigned, co-pending U.S. patent application Ser. No. 12/754,209, filed on Apr. 5, 2010, and titled FLUID LEVEL INDICATOR IN AN AIRLESS FLUID SPRAYER, which is hereby incorporated by reference in its entirety.
During operation of spray gun 100, valve mechanism 262 allows the inlet flow of fluid material (i.e., in direction 266). When the user releases trigger 114 (which slows or stops the fluid pump mechanism), valve mechanism 262 restricts or prevents fluid material in the inlet fluid path from flowing back toward the fluid container (i.e., in direction 268). In this manner, valve mechanism 262 retains the fluid material in the inlet fluid path and can operate to prevent air from being drawn into the inlet fluid path. When the user subsequently resumes operation, spray gun 100 operates with little or no air in the fluid inlet flow.
Body 430 includes a tube or conduit 444 extending toward and received by a fluid return port of spray gun 100. Tube 444 and fitting 426 form a return fluid flow path from spray gun 100 to return tube 118.
In the illustrated embodiment, body 430 is sized to accommodate a fluid filter 431 within a compartment 440 formed by an upwardly extending wall 441. The fluid filter 431 is positioned in the inlet fluid flow path between valve mechanism 462 and spray gun 100. Alternatively, or in addition, assembly 422 can be configured such that a valve mechanism is positioned between the fluid filter 431 and spray gun 100.
Fluid filter 431 is positioned closer to the pump mechanism of spray gun 100 as compared to fluid intake assembly configurations having the fluid filter disposed in the fluid container (e.g., positioned at an end of the suction tube in the fluid container). Positioning the fluid filter closer to the pump mechanism can improve the fluid suction capabilities (e.g., a reduce pressure drop along the fluid path).
In one embodiment, a portion (e.g., portion 108) of spray gun 100 engages the outer periphery 443 of body 430. A seal is formed between body 430 and the portion of spray gun 100. For instance, a sealing member, such as a mechanical gasket material, extends along the outer periphery 443 and is configured to engage the portion of spray gun 100. In one embodiment, spray gun 100 can comprise a downwardly extending wall forming a compartment sized to accommodate body 430 therein. The downwardly extending wall engages the outer periphery 443 of body 430.
Body 430 can be attached to spray gun 100 using any suitable attachment mechanism(s). In one embodiment, body 430 can include one or more fasteners configured to engage spray gun 100. For instance, a locking mechanism can be provided that extends toward and engages a recess or aperture formed in spray gun 100. In the illustrated embodiment, body 430 includes a planar portion 445 having a circular, or substantially circular, shape. A collar (not shown) is utilized to secure portion 445 to spray gun 100. In one embodiment, the collar engages a bottom surface 447 of portion 445 and includes threads configured to engage corresponding threads on spray gun 100. It is noted that this is one example for securing assembly 422 to spray gun 110. Any suitable connection structures and mechanisms can be utilized.
While various embodiments of the invention have been set forth in the foregoing description, together with details of the structure and function of various embodiments of the disclosure, this disclosure is illustrative only, and changes may be made in detail, especially in matters of structure and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. For example, the particular elements may vary depending on the particular application for the system or method while maintaining substantially the same functionality without departing from the scope and spirit of the present disclosure and/or the appended claims.
