Patent Description:
Spray guns are widely used in vehicle body repair shops when re-spraying a vehicle that has been repaired following an accident. In the known spray guns, the liquid is contained in a reservoir attached to the gun from where it is fed to a spray nozzle. On emerging from the spray nozzle, the liquid is atomized and forms a spray with compressed air supplied to the nozzle. The liquid may be gravity fed or suction fed or, more recently, pressure fed by an air bleed line to the reservoir from the compressed air line to the spray gun, or from the spray gun itself.

<CIT> as well as <CIT> discloses a spray gun and a detachable liquid reservoir releasably attached to the spray gun by engagement of mateable, non-threaded formations provided on the spray gun and the reservoir. The spray gun has an integral connector boss with a socket for reception of a connector tube of the reservoir. The boss has an external flange at the distal end and the reservoir has hook members separate from the connector tube. The hook members are co-operable with the flange when the connector tube is received in the socket to secure releasably the reservoir to the spray gun.

Traditionally, the liquid is contained in a rigid reservoir or pot removably mounted on the spray gun. In this way, the pot can be removed for cleaning or replacement. Previously, the pot was secured to the gun empty and provided with a removable lid by which the desired liquid could be added to the pot while attached to the gun. On completion of spraying, the pot can be removed and the gun and pot cleaned for re-use.

More recently, reservoir assemblies have been developed that enable painters to mix less paint and drastically reduce the amount of technician time required for gun cleaning. The PPS™ Paint Preparation System available from <NUM> Company of St. Paul, MN provides a reservoir that eliminates the need for traditional mixing cups and paint strainers. The PPS™ Paint Preparation System reservoir includes a reusable outer container or cup, an open-topped liner and a lid. The liner fits into the outer container, and paint (or other liquid) that is to be sprayed is contained within the liner. The lid is assembled with the liner and provides a spout or conduit through which the contained paint is conveyed. In use, the liner collapses as paint is withdrawn and, after spraying, the liner and lid can be removed allowing a new, clean liner and lid to be employed for the next use of the spray gun. As a result, the amount of cleaning required is considerably reduced and the spray gun can be readily adapted to apply different paints (or other sprayable coatings) in a simple manner.

Regardless of exact format, the reservoir or pot incorporates one or more connection features that facilitate removable assembly or attachment to the spray gun. In many instances, the spray gun and reservoir are designed in tandem, providing complementary connection formats that promote direct assembly of the reservoir to the spray gun. In other instances, an adaptor is employed between the reservoir and spray gun. The adaptor has a first connection format at one end that is compatible with the spray gun inlet and a second connection format at an opposite end that is compatible with the reservoir outlet. Screw thread-type connection formats are commonly used. Other connection formats have also been suggested, such as a releasable quick-fit connection employing bayonet type formations that are engageable with a push-twist action requiring less than one complete turn of the reservoir to connect/disconnect the reservoir as described, for example, in <CIT>. To minimize the possibility of accidental release of the reservoir or diminished fluid-tight seal between the reservoir and spray gun, it has further been suggested to incorporate security clips into the complimentary connection format as described in <CIT>. While these and other connection formats have improved the ease and confidence of removable connection between the reservoir and spray gun, opportunities for improvement remain.

The inventors of the present disclosure recognized that a need exists for reservoir components and for a spray gun reservoir connector system that overcomes one or more of the above-mentioned problems.

The invention is defined by the features of independent claim <NUM>. The dependent claims relate to embodiments of the invention.

Some aspects of the present disclosure are directed toward a spray gun reservoir component. The spray gun reservoir component includes a liquid outlet and an outer face, and defines a centerline plane and an attachment plane. The liquid outlet surrounds a longitudinal axis. The outer face extends away from the liquid outlet. The centerline plane passes through the longitudinal axis. The attachment plane is defined orthogonally to the longitudinal axis and the centerline plane. The outer face further comprises a retention feature extending away from the centerline plane and generally parallel to the attachment plane. In some embodiments, the spray gun reservoir component further comprises a bearing surface formed on the outer face along the attachment plane to engage with a corresponding bearing surface on a liquid spray gun attachment point, with the bearing surface comprising the retention feature.

Other aspects of the present disclosure are directed toward a spray gun reservoir connector system. The system includes a reservoir, a spray gun inlet, a first connector format and a second connector format. The first connector format is provided with one of the reservoir and the spray gun inlet; the second connector format is provided with the other of the reservoir and the spray gun inlet. The first connector format includes at least one undercut and at least one contact surface. The contact surface defines a ramp region. The second connector format includes at least one undercut and at least one contact face. The contact face defines a ramp section. The connector formats have a complementary construction such that upon alignment and rotation of the reservoir relative to the spray gun inlet about a common longitudinal axis, an interface between the ramp region and ramp section alters a spatial relationship of the reservoir and spray gun inlet relative to one another in a direction of the longitudinal axis. As the reservoir is rotated on to the spray gun inlet (and/or vice-versa), the ramping surfaces (i.e., the ramp region and ramp section) guide the undercut features of the lid into the mating undercut features spray gun inlet. The mated relationship provides retention of the reservoir and spray gun inlet relative to one another, and offers stability of the reservoir on the spray gun inlet in an axis perpendicular to the longitudinal axis. In other embodiments, the connector formats further include one or more additional retention features that selectively lock the reservoir and the spray gun inlet relative to one another.

Other aspects of the present disclosure are directed toward a reservoir component of a reservoir containing a supply of liquid for delivery to a spray gun. The reservoir component includes the first connector format described above. In some embodiments, the reservoir component is a plastic injection molded part, with the undercut being aligned with the tool slide axis of an injection molding tool utilized to generate the reservoir component. In other embodiments, the reservoir component is a lid.

Aspects of the present disclosure are directed toward connector systems that facilitate releasable, sealed connection between a spray gun and reservoir. By way of background, <FIG> depicts a spray gun paint system <NUM> including a spray gun <NUM> of a gravity-feed type and a reservoir <NUM>. The gun <NUM> includes a body <NUM>, a handle <NUM>, and a spray nozzle <NUM> at a front end of the body <NUM>. The gun <NUM> is manually operated by a trigger <NUM> that is pivotally mounted on the sides of the body <NUM>. An inlet port <NUM> (referenced generally) is formed in or carried by the body <NUM>, and is configured to establish a fluid connection between an interior spray conduit (hidden) of the spray gun <NUM> and the reservoir <NUM>. The reservoir <NUM> contains liquid (e.g., paint) to be sprayed, and is connected to the inlet port <NUM> (it being understood that the connection implicated by the drawing of <FIG> does not necessarily reflect the connector systems of the present disclosure). In use, the spray gun <NUM> is connected via a connector <NUM> at a lower end of the handle <NUM> to a source of compressed air (not shown). Compressed air is delivered through the gun <NUM> when the user pulls on the trigger <NUM> and paint is delivered under gravity from the reservoir <NUM> through the spray gun <NUM> to the nozzle <NUM>. As a result, the paint (or other liquid) is atomized on leaving the nozzle <NUM> to form a spray with the compressed air leaving the nozzle <NUM>.

For ease of illustration, connection formats of the present disclosure between the spray gun <NUM> and the reservoir <NUM> are not included with the drawing of <FIG>. In general terms, the reservoir <NUM> includes one or more components establishing a first connection format for connection to the spray gun <NUM>. A complementary, second connection format is included with an adaptor (not shown) assembled between the reservoir <NUM> and the inlet port <NUM>, or with the spray gun <NUM>. With this background in mind, <FIG> illustrates one non-limiting example of a reservoir <NUM> in accordance with principles of the present disclosure. The reservoir <NUM> includes an outer container <NUM> and a lid <NUM>. The lid <NUM> includes or provides a first connection format or feature <NUM> (referenced generally) described in greater detail below. In other embodiments, the first connection format or feature <NUM> can be provided with any other component of the reservoir <NUM>. That is to say, while the descriptions below describe connection formats of the present disclosure as part of a reservoir lid, the so-described connection formats can alternatively be provided with any other reservoir component apart from a lid. Remaining components of the reservoir <NUM> can assume various forms and are optional. For example, in some embodiments the reservoir <NUM> further includes a liner <NUM> and a collar <NUM>. In general terms, the liner <NUM> fits within the interior of the container <NUM> and can have a narrow rim <NUM> at the open end which sits on the top edge of the container <NUM>. The lid <NUM> is configured to fit onto or in the open end of the liner <NUM> to locate the peripheral edge of the lid <NUM> over the rim <NUM> of the liner <NUM>. The lid/liner assembly is secured in place by the annular collar <NUM> that releasably engages the container <NUM> (e.g., threaded interface as shown, snap fit, etc.).

In addition to the connection format <NUM>, the lid <NUM> forms a liquid outlet <NUM> (referenced generally) through which liquid contained by the liner <NUM> can flow. In use, the liner <NUM> collapses in an axial direction toward the lid <NUM> as paint is withdrawn from the reservoir <NUM>. Air is permitted to enter the outer container (in this embodiment through an optional vent hole <NUM> in the outer container <NUM>) as the liner <NUM> collapses. On completion of spraying, the reservoir <NUM> can be detached from the spray gun <NUM> (<FIG>), the collar <NUM> released and the lid/liner assembly removed from the outer container <NUM> in one piece. The outer container <NUM> and the collar <NUM> are left clean and ready for re-use with a fresh liner <NUM> and lid <NUM>. In this way, excessive cleaning of the reservoir <NUM> can be avoided.

In other embodiments, the reservoirs of the present disclosure need not include the liner <NUM> and/or the collar <NUM>. In some embodiments, the reservoir need not include the outer container (for example, the lid and liner may be separable or removable from the outer container such that the outer container is not needed during spraying). The connection formats of the present disclosure can be implemented with these and/or a plethora of other reservoir configurations that may or may not be directly implicated by the figures.

As mentioned above, the first connection format <NUM> provided with the lid <NUM> is configured to releasably connect with a complementary second connection format provided with a spray gun inlet or apparatus. As point of reference, <FIG> illustrates the lid <NUM> along with a portion of a spray gun inlet <NUM> that otherwise carries or provides a second complementary connection format <NUM> (referenced generally). The spray gun inlet <NUM> can be an adaptor, an integral portion of the spray gun <NUM> (<FIG>), provided on a detachable spray head assembly of a spray gun (see, e.g., "spray head assembly <NUM>" in <CIT>), etc. Regardless, the first and second connection formats <NUM>, <NUM> are configured in tandem, promoting a releasable, liquid-tight sealed mounting or connection between the lid <NUM> and the spray gun inlet <NUM>. In some embodiments, the first and second complementary connection formats <NUM>, <NUM> can be viewed as collectively defining a spray gun reservoir connector system <NUM> in accordance with principles of the present disclosure.

A mentioned above, the first connection format <NUM> can be provided as part of the lid <NUM>. In some embodiments, and as shown in <FIG> and <FIG> (otherwise illustrating the lid <NUM> in isolation), a shape of the lid <NUM> can be viewed as defining a longitudinal axis A. In addition to the first connection format <NUM> (referenced generally) and the liquid outlet <NUM>, the lid <NUM> includes or defines a wall <NUM>, a flange <NUM>, and a hub <NUM>. The wall <NUM> defines opposing, inner and outer faces <NUM>, <NUM>, with at least the outer face <NUM> of the wall <NUM> having, for example (but not limited to) the curved (e.g., hemispherical) shape implicated by the drawings. Finally, the wall <NUM> defines a central opening <NUM> (best seen in <FIG>) that is preferably co-axial with the longitudinal axis A. The flange <NUM> projects radially outwardly from a perimeter of the wall <NUM> opposite the central opening <NUM>, and can be configured to interface with one or more other components of the reservoir <NUM> (<FIG>), for example the outer container <NUM> (<FIG>). In the embodiment shown, the hub <NUM> projects longitudinally (relative to the longitudinal axis A) from the flange <NUM> in a direction opposite the wall <NUM>, and can be configured to interface with one or more other components of the reservoir <NUM>, for example the liner <NUM> (<FIG>). The wall <NUM>, flange <NUM>, and the hub <NUM> can assume a wide variety of other forms. Further, in other embodiments, one or both of the flange <NUM> and the hub <NUM> can be omitted.

The liquid outlet <NUM> includes a spout <NUM>. The spout <NUM> is preferably co-axial with the longitudinal axis A, in this case projecting upwardly (relative to the orientation of <FIG> and <FIG>) relative to the wall <NUM> and terminating at a leading surface <NUM>. In other embodiments, the spout <NUM> may be contained within the body of the lid <NUM>, or comprise a recess in the outer face <NUM> of the lid <NUM>. The spout <NUM> defines a passage <NUM> (best seen in <FIG>) that is aligned with, and open to, the central opening <NUM>. With this construction, liquid flow through the liquid outlet <NUM> (e.g., from a location within the confines of the inner face <NUM> of the wall <NUM> to a location external the spout <NUM>) readily occurs through the central opening <NUM> and the passage <NUM>.

In some embodiments, the liquid outlet <NUM> includes one or more additional features that can optionally be considered components of the first connection format <NUM>. For example, the leading surface <NUM> can be configured to form a face seal with the complementary component or device (e.g., the spray gun inlet <NUM> of <FIG>) upon assembly to the lid <NUM>. The sealing relationship can be established by the leading surface <NUM> being substantially flat or planar (i.e., within <NUM>% of a truly flat or planar shape) in a plane perpendicular to the longitudinal axis A, or tapered or chamfered and configured to seal against a corresponding tapered surface on the complementary component. Liquid tight seal(s) between the lid <NUM> and the spray gun inlet <NUM> can alternatively be promoted with a variety of other constructions that may or may not include the leading surface <NUM> (e.g., rings formed in or on the spout <NUM> or the complementary component, O-rings, a friction or interference fit, etc.).

Against the above background, and with additional reference to <FIG>, the first connection format <NUM> (referenced generally) includes a platform <NUM>. The platform <NUM> can be viewed as a projection from the outer face <NUM> of the wall <NUM> at a location external the spout <NUM>. In some embodiments, the wall <NUM> and the platform <NUM> can be formed as an integral, continuous structure, with a shape of the platform <NUM> representing a deviation from the curved shape defined by the wall <NUM> in extension from the flange <NUM>. Further, and as best seen in <FIG>, the spout <NUM> and the platform <NUM> can also be formed as an integral, continuous structure in some embodiments. Regardless, the platform <NUM> is configured to facilitate selective connection or mounting with the second complementary connection format <NUM> (<FIG>) as described below.

The platform <NUM> extends from the outer face <NUM> and terminates at a connector structure <NUM> (referenced generally). The connector structure <NUM> is configured to provide a sliding interface with the spray gun inlet (not shown), and can have a shape differing from the optional curved shape of the wall <NUM>. The connector structure <NUM> circumferentially surrounds the spout <NUM> (e.g., the connector structure <NUM> revolves generally about the longitudinal axis A at a location radially exterior the spout <NUM>). Geometry features of the connector structure <NUM> are configured to facilitate engagement with corresponding features of the complementary second connection format <NUM> (<FIG>).

For example, one or more trapping regions or undercuts (such as first and second trapping regions or undercuts 130a, 130b illustrated in the non-limiting embodiment of <FIG>) are defined in the connector structure <NUM>, along with one or more contact or bearing surfaces (such as first and second contact or bearing surfaces 132a, 132b illustrated in the non-limiting embodiment of <FIG>). With the non-limiting example shown in which two of the undercuts 130a, 130b and two of the contact surfaces 132a, 132b are provided, relative to a rotational direction defined by revolution of the connector structure <NUM> about the spout <NUM> (i.e., clockwise or counterclockwise), the first contact surface 132a extends circumferentially in the clockwise direction from the first undercut 130a to the second undercut 130b and has a geometry generating a lead-in region 134a and a ramp region 136a. Relative to the clockwise direction, then, the lead-in region 134a is "ahead" or "upstream" of the ramp region 136a. Similarly, the second contact surface 132b can extend circumferentially in the clockwise direction from the second undercut 130b to the first undercut 130a, and has a geometry generating a lead-in region 134b and a ramp region 136b. In yet other embodiments, the optional second contact surface 132b can have a construction differing from that of the first contact surface 132a and may or may not include one or both of the lead-in region 134b and the ramp region 136b. In yet other embodiments, where three or more of the contact surfaces (and/or three of the undercuts) are provided, the first contact surface 130a can have the lead-in region 134a and the ramp region 136a, whereas remaining ones of the contact surfaces can be identical to the first contact surface 130a or can have a different construction.

The contact surfaces 132a, 132b (where two are provided) can be substantially identical in some embodiments such that the following description of the first contact surface 132a applies equally to the second contact surface 132b. A major plane of the lead-in region 134a can be substantially flat (i.e., within <NUM>% of a truly flat shape) and substantially perpendicular (i.e., within <NUM>% of a truly perpendicular relationship) to the longitudinal axis A. The ramp region 136a tapers longitudinally downward (relative to the upright orientation of <FIG>) in extension from the lead-in region 134a to the second undercut 130a, creating a partial helical shape. Thus, the lead-in region 134a is longitudinally or vertically "above" the ramp region 136a (relative to the upright orientation of <FIG>), and a major plane of the ramp region 136a is oblique to the major plane of the lead-in region 134a (and is not substantially perpendicular to the longitudinal axis A). While the ramp regions 136a, 136b shown in, e.g., <FIG> are depicted as a linearly inclined, it should be understood that different trajectories are possible (e.g., curved or partially curved) within the scope of the present disclosure.

Geometry features generated by the first undercut 130a are provided by <FIG>, it being understood that the second undercut 130b (<FIG>) (if provided) can have a substantially identical configuration. Commensurate with the above descriptions, the first undercut 130a is formed at, or defines, a transition between the ramp region 136b of the second contact surface 132b and the lead-in region 134a of the first contact surface 132a. A shoulder or retention feature 140a is defined by the undercut 130a, extending between a leading end <NUM> of the first contact surface 132a and a trailing end <NUM> of the second contact surface 132b. A major plane of the shoulder 140a is non-parallel relative to the major plane of the lead-in region 134a and relative to the major plane of the ramp region 136b, with the shoulder 140a projecting outwardly above the second contact surface ramp region 136b. A shape of the shoulder 140a can be viewed as defining an axial retention surface <NUM> and a stop surface <NUM>.

Returning to <FIG>, while the first connection format <NUM> has been described as including two of the undercuts 130a, 130b (and two of the contact surfaces 132a, 132b), in other embodiments one or three or more undercuts can be formed (and a corresponding number of contact surfaces). Where more than one is provided, the undercuts 130a, 130b may be equidistantly spaced along a circumference of the connector structure <NUM> in some embodiments. Further, while the platform <NUM> and the connector structure <NUM> have been shown as being circular in nature, other shapes are also acceptable. For example, a shape of the connector structure <NUM> can be an ellipse, a polygon, a complex shape such as a combination of the aforementioned, etc..

In some embodiments, the lid <NUM> (and thus the first connection format <NUM>) is a plastic injection molded component. Under these circumstances, the undercuts 130a, 130b are readily generated with conventional injection molding systems, locating the undercuts 130a, 130b along or in alignment with the tool slide path or slide direction. For example, with respect to the non-limiting example of <FIG>, the undercuts 130a, 130b can be located perpendicular to a parting line (identified at <NUM> in <FIG>) in the injection molding tooling in some embodiments and in alignment with the slides of the tool. Thus, the undercuts 130a, 130b (and other features associated with connection formats of the present disclosure) are highly viable with injection molding, requiring no complex or substantive changes to conventional injection molding tool formats. Other manufacturing techniques and materials are also acceptable, and the lids (and corresponding connection format) of the present disclosure are not limited to plastic injection molding.

Returning to <FIG>, the second connection format <NUM> is configured to selectively mate with features of the first connection format <NUM>. In some embodiments, the second connection format <NUM> is provided as part of an adaptor, such as an adaptor <NUM> shown in <FIG>. In addition to the second connection format <NUM> (referenced generally in <FIG>), the adaptor <NUM> includes a tubular member <NUM>. Details on the various components are provided below. In general terms, a shape of the adaptor <NUM> defines a central axis X. The tubular member <NUM> can include or provide features akin to conventional spray gun reservoir connection adaptors, such as for establishing connection to an inlet port of the spray gun. A base <NUM> of the second connection format <NUM> projects from the tubular member <NUM> and carries or defines other portions of the second connection format <NUM>, and promotes mounting of the adaptor <NUM> to the lid <NUM> (<FIG>).

The tubular member <NUM> can assume various forms, and defines a central passageway <NUM> (hidden in <FIG>, but shown, for example, in <FIG>). The passageway <NUM> is open at a leading end <NUM> of the tubular member <NUM>. The tubular member <NUM> forms or provides mounting features that facilitate assembly to a conventional (e.g., threaded) spray gun inlet port. For example, exterior threads <NUM> can be provided along the tubular member <NUM> adjacent the leading end <NUM>, configured to threadably interface with threads provided by the spray gun inlet port. In this regard, a pitch, profile and spacing of the exterior threads <NUM> can be selected in accordance with the specific thread pattern in the make/model of the spray gun with which the adaptor <NUM> is intended for use. Other spray gun mounting features are equally acceptable that may or may not include or require the exterior threads <NUM>. The tubular member <NUM> can optionally further include or define a grasping section <NUM>. The grasping section <NUM> is configured to facilitate user manipulation of the adaptor <NUM> with a conventional tool, and in some embodiments includes or defines a hexagonal surface pattern adapted to be readily engaged by a wrench. In other embodiments, the grasping section <NUM> can be omitted (e.g., a hexagonal or similarly-shaped surface need not be provided).

With reference to <FIG>, the base <NUM> extends from the tubular member <NUM> opposite the leading end <NUM>, and includes a ring <NUM> and a flange <NUM>. The flange <NUM> forms a connector structure <NUM> (referenced generally) as described below. As best shown in <FIG>, the ring <NUM> and the flange <NUM> combine to define a chamber <NUM> that is open to the central passageway <NUM> of the tubular member <NUM> and that is configured to receive the spout <NUM> (<FIG>) of the lid <NUM> (<FIG>). A diameter of the chamber <NUM> corresponds with an outer diameter of the spout <NUM> (<FIG>), and is selected to slidably receive the spout <NUM>. The flange <NUM> projects longitudinally from an outer perimeter of the ring <NUM> in a direction opposite the tubular member <NUM> and terminates at the connector structure <NUM>.

Geometry features of the connector structure <NUM> are commensurate with those described above with respect to the connector structure <NUM> (<FIG>) of the first connection format <NUM> (<FIG>). For example, one or more trapping regions or undercuts (such as first and second trapping regions or undercuts 230a, 230b illustrated in the non-limiting embodiment of <FIG>) are formed along the connector structure <NUM>, generating one or more contact or bearing faces (such as first and second contact or bearing faces 232a, 232b illustrated in the non-limiting embodiment of <FIG>). The shape of the contact faces 232a, 232b (where two are provided) correspond with the first connection format contact surfaces 132a, 132b as described above, with each at least one, optionally all, of the contact faces 232a, 232b including or defining a lead-in section 234a, 234b and a ramp section 236a, 236b. The circumferential location and shape of the undercuts 230a, 230b (where two are provided) corresponds with the first connection format undercuts 130a, 130b (<FIG>) as described above. A shape of at least one, optionally all, of the undercuts 230a, 230b establishes a finger or retention feature 240a, 240b at the transition between the first and second contact faces 232a, 232b. For example, and as identified in <FIG>, the finger 240a defined at the first undercut 230a extends between a leading end <NUM> of the first contact face 232a and a trailing end <NUM> of the second contact face 232b. A major plane of the finger 240a is non-parallel relative to the major plane of the lead-in section 234a and relative to the major plane of the ramp section 236b, with the finger 240a projecting outwardly over the second contact face ramp section 236b. With additional reference to <FIG>, an angular orientation of the finger 240a relative to the major plane of the lead-in section 234a corresponds with an angular orientation of the shoulder 140a relative to the lead-in region 134a. A shape of the finger 240a can be viewed as defining an axial retention surface <NUM> and a stop surface <NUM>.

Returning to <FIG>, while the second connection format <NUM> has been described as including two of the undercuts 230a, 230b (and two of the contact faces 232a, 232b), in other embodiments one or three or more undercuts can be formed (and a corresponding number of contact faces), corresponding with the undercut construction of the first connection format <NUM> (<FIG>). Further, while the base <NUM> and the connector structure <NUM> have been shown as being circular in nature, other shapes are also acceptable, corresponding with a shape of the first connection format <NUM>.

With reference to <FIG>, engagement between the first and second connection formats <NUM>, <NUM> (and thus between the lid <NUM> and the adaptor <NUM>) initially entails aligning the adaptor <NUM> with the liquid outlet <NUM>. The lid <NUM> and the adaptor <NUM> are spatially arranged such that the connector structure <NUM> of the adaptor <NUM> faces the connector structure <NUM> of the lid <NUM>, and the adaptor undercuts 230a, 230b (one of which is visible in <FIG>) are rotationally off-set from the lid undercuts 130a, 130b (e.g., in the arrangement of <FIG>, the first finger 240a is generally aligned with the lead-in region 134b of the second contact surface 132b).

The lid <NUM> and the adaptor <NUM> are then directed toward one another, bringing the connector structure <NUM> of the adaptor <NUM> into contact with the connector structure <NUM> of the lid <NUM> as shown in <FIG>. The spout <NUM> of the lid <NUM> is slidably received within the chamber <NUM> of the adaptor <NUM>, with the longitudinal axis A of the lid <NUM> being aligned with the central axis X of the adaptor <NUM>. Due to the rotational misalignment, the adaptor connector structure <NUM> does not initially mesh with the lid connector structure <NUM>. For example, <FIG> and <FIG> illustrate that the first finger 240a is rotationally off-set from the first shoulder 140a, and bears against or is contact with the lead-in region 134b of the second contact surface 132a. Though not directly visible in the drawings, a similar relationship is established at between the second finger 240b and the first contact surface 132a. In the initial assembly state of <FIG>, then, the adaptor undercuts 230a, 230b and fingers 240a, 240b are vertically "above" the lid undercuts 130a, 130b.

The adaptor <NUM> is then rotated relative to the lid <NUM> (and/or vice-versa) while at least a slight compression force is maintained (e.g., gravity, user-applied force, etc.), directing each of the adapter fingers 240a, 240b toward a corresponding one of the lid undercuts 130a, 130b. For example, and as identified in <FIG>, the adaptor <NUM> has been rotated (e.g., clockwise) such that the finger 240a approaches (and later enters) the lid first undercut 130a. Due to the sliding interface between the ramp section 236b of the adaptor second contact face 232b and the lid ramp region 136b of the lid second contact surface 132b (and corresponding helical-like shapes), as the adaptor <NUM> is rotated, the adaptor <NUM> vertically drops or lower relative to the lid <NUM> such that as the finger 240a nears the lid undercut 130a, the finger 240a comes into alignment with the lid shoulder 140a.

With continued rotation of the adaptor <NUM> relative to the lid <NUM> (and/or vice-versa), the lid connector structure <NUM> (<FIG>) robustly engages the adaptor connector structure <NUM> (<FIG>) at the corresponding undercuts 130a, 130b, 230a, 230b. <FIG> and <FIG> illustrate the achieved locked state of the lid <NUM> and the adaptor <NUM>. As shown, the adaptor first finger 240a is lodged within the lid first undercut 130a, and the lid first shoulder 140a is lodged within the adaptor first undercut 230a; the adaptor first finger 240a bears against the lid first shoulder 140a. Though not visible, a similar relationship exists at an interface between the lid second undercut 130b and the adaptor second undercut 230b. Liquid within the lid <NUM> readily flows through the adaptor <NUM> via the established fluid connection at the passage <NUM>, the chamber <NUM>, and the passageway <NUM>.

In more general terms, and with additional reference to <FIG>, as the lid <NUM> is rotated on to the adaptor <NUM> (and/or vice-versa), interface between the lid ramp region 136a, 136b and the corresponding adaptor ramp section 236a, 236b guides the lid undercut 130a, 130b into the corresponding, mating adaptor undercut 230a, 230b (and vice-versa). The downward angular orientation (in the direction of rotation) of the shoulders 140a, 140b relative to a plane perpendicular to the axis of rotation dictates that as the fingers 240a, 240b are progressively advanced along the corresponding shoulder 140a, 140b, the adaptor <NUM> is pulled or drawn downwardly (relative to the orientation of <FIG> and <FIG>) on to the lid <NUM>, promoting a liquid-tight seal between the components. The undercuts 130a, 130b, 230a, 230b act as end stops to rotational motion of the adaptor <NUM> relative to the lid <NUM> (and/or vice-versa). With additional reference to <FIG> and <FIG>, axial retention is achieved by an interface between the axial retention surface <NUM> of the shoulder 140a, 140b and the axial retention surface <NUM> of the corresponding finger 240a, 240b; a rotational stop is effectuated by contact between the shoulder 140a, 140b and the stop surface <NUM> of the corresponding finger 240a, 240b and between the finger 240a, 240b and the stop surface <NUM> of the corresponding shoulder 140a, 140b.

Engagement between corresponding ones of the lid undercuts 130a, 130b and the adaptor undercuts 230a, 230b provides retention of the adaptor <NUM> to the lid <NUM>; further, interface between the lid connector structure <NUM> and the adaptor connector structure <NUM> provides stability of the lid <NUM> on the adaptor <NUM> (and vice-versa) in an axis perpendicular to the longitudinal axis A. The ramping geometry of the connector structures <NUM>, <NUM> facilitates uncoupling of the lid <NUM> from the adaptor <NUM> through axial rotation in some embodiments. In this regard, it will be recalled that in some embodiments, sealing features can be provided that promote a liquid-tight seal between the lid <NUM> and the adaptor <NUM> in the locked state. The liquid-tight seal can be difficult to break; however, as the adaptor <NUM> is rotated relative to the lid <NUM> from the locked state, the adaptor <NUM> is ramped up and off of the sealing feature, aiding in removing the adaptor <NUM> from the lid <NUM>.

Features or configurations of the connection formats <NUM>, <NUM> can alternatively be described with reference to various planes. For example, <FIG> reproduces the view of the lid <NUM> of <FIG>, along with an X, Y, Z coordinate designation. The Z axis or direction includes (or is parallel with) the longitudinal axis A. The X and Y axes (or directions) are orthogonal to the Z axis, and to each other. A centerline plane CP is defined in the X, Z plane and includes (or is parallel with) the longitudinal axis A. In other words, the centerline plane CP passes through the longitudinal axis A. With the one non-limiting embodiment of <FIG> in which two of the trapping regions or undercuts 130a, 130b are provided and equidistantly spaced, the centerline plane CP can centered between the two trapping regions 130a, 130b. This arrangement is further reflected in the top view of <FIG> (that is otherwise a reproduction of <FIG>). With continued reference to <FIG> and <FIG>, an attachment plane AP is further defined orthogonal to the centerline plane CP (i.e., the attachment plane AP is defined in the X, Y plane). In some embodiments, the attachment plane AP includes the major plane of the lead-in region 134a, 134b of each of the bearing or contact surfaces 132a, 132b. This one location of the attachment plane AP is further evidenced in <FIG> (that is otherwise a reproduction of <FIG>) and in <FIG> (that is otherwise a reproduction of <FIG>). Finally, <FIG> identifies with arrows RD a receiving direction in which the adaptor <NUM> (<FIG>) is rotated relative to the lid <NUM> when transitioning to the locked state as described above.

With the above conventions in mind, the outer face <NUM> extends away from the liquid outlet <NUM> and in some embodiments can be viewed as comprising one or more of the retention features (e.g., the retention feature or shoulder 140a, 140b associated with the corresponding trapping region 130a, 130b) that extends away from the centerline plane CP in a direction generally parallel (i.e., within <NUM>% of a truly parallel relationship) to the attachment plane AP. This relationship is best seen in <FIG> and <FIG>. The retention feature(s) 140a, 140b can be considered as recessed within the outer face <NUM>, or as protruding from the outer face <NUM>. In other embodiments, the retention feature(s) 140a, 140b can be considered as being recessed within the lead-in region 134a, 134b of the corresponding contact surface 132a, 132b (e.g., <FIG> reflects the retention feature 140a as being recessed relative to the lead-in region 134a of the first contact surface 132a), or as protruding from the ramp region 136a, 136b of the corresponding contact surface 132a, 132b (e.g., <FIG> reflects the retention feature 140a as protruding from the ramp region 136b of the second contact surface 132b).

With reference between <FIG>, a retention feature angle α is defined between the centerline plane CP and the stop surface <NUM> of the corresponding retention feature 140a, 140b. The stop surfaces <NUM> are primarily hidden in the views of <FIG>, but is identified for the retention feature 140a in <FIG>. With specific reference to <FIG> and <FIG>, the retention feature angle α is not less than <NUM> degrees in some embodiments. Further, the stop surface <NUM> is accessible within a span of the retention feature angle α and from the receiving direction RD that is otherwise generally defined along the attachment plane AP. This relationship is further evidenced by <FIG> also highlights that in some embodiments, the axial retention surface <NUM> of the retention feature 140a is arranged or disposed at an acute angle relative to the attachment plane AP such that the trapping region 130a is formed between the axial retention surface <NUM> and the outer face <NUM> (e.g., along the second contact surface 132b). The above planes and angles can apply equally to the second connection format <NUM> (<FIG>).

The retention feature angle α can support the optional plastic injection molding attributes of the lid <NUM> as described above. For example, with optional embodiments in which the lid <NUM> is a plastic injection molded component formed from a two-part mold, the centerline plane CP can be viewed as being defined at the parting line <NUM> (<FIG>). Thus, the retention feature angle α of not less than <NUM> degrees reflects that the first and second trapping regions 130a, 130b can be in alignment with the tool slide path or slide direction of the two-part mold. It is envisioned that in other embodiments, the plastic injection molding tooling can include three or more mold parts, with the retention feature angle α being not less than a corresponding dimension appropriate for promoting alignment of the trapping regions with a slide direction or tool slide path of the mold parts. For example, with a three-part mold, the retention feature angle α is not less than <NUM> degrees; with a four-part mold, the retention feature angle α is no less than <NUM> degrees; etc..

While the above descriptions have provided the complementary second connection format <NUM> (referenced generally in <FIG>) as part of the adaptor <NUM>, other configurations are also acceptable. For example, the second connection format <NUM> can be permanently assembled to or provided as an integral part of a spray gun (e.g., the second connection format <NUM> as described above can be provided as or at the inlet port <NUM> (<FIG>) of the spray gun <NUM> (<FIG>)).

In some embodiments, engagement between the connector structures <NUM>, <NUM> in the locked state (i.e., at the undercuts 130a, 130b, 230a, 230b) can serve as or provide a primary form of retention between the lid <NUM> and the adaptor <NUM>. In other embodiments in accordance with principles of the present disclosure, one or more additional connective features can be included that may or may not serve as the primary form of retention. For example, <FIG> illustrates portions of another spray gun reservoir connector system <NUM> including complementary first and second connection formats <NUM>, <NUM> (referenced generally) in accordance with principles of the present disclosure. The first connection format <NUM> is provided as part of a lid <NUM>; the second connection format <NUM> is provided as part of a spray gun liquid inlet, such as an adaptor <NUM> as shown adapted to connect to a spray gun.

The lid <NUM> is shown in greater detail in <FIG> and in many respects can be akin to the lid <NUM> (<FIG>) described above. The lid <NUM> generally includes a wall <NUM> and a liquid outlet <NUM>. The liquid outlet <NUM> includes a spout <NUM> along with optional sealing features, such as a leading surface <NUM> of the spout <NUM> and/or one more annular ribs <NUM> formed along an exterior of the spout <NUM> proximate the leading surface <NUM>.

The first connection format <NUM> (referenced generally in <FIG>) includes a platform <NUM> and at least one retention member (such as first and second retention members 312a, 312b illustrated in the non-limiting embodiment of <FIG>). In general terms, the platform <NUM> can be highly akin to the platform <NUM> (<FIG>) described above, and terminates or forms a connector structure <NUM>. The connector structure <NUM> can be akin to the connector structure <NUM> (<FIG>), providing geometry features that defines at least one trapping region or undercut (such as first and second trapping regions or undercuts 330a, 330b illustrated in the non-limiting embodiment of <FIG>). The retention members 312a, 312b are circumferentially offset from the undercuts 330a, 330b and effectuate selective locked engagement with the second connection format <NUM> (<FIG>) as described below.

Commensurate with previous explanations, the first and second undercuts 330a, 330b (where two are provided) are defined in the connector structure <NUM>, with at least one contact or bearing surface (such as first and second contact or bearing surfaces 332a, 332b illustrated in the non-limiting embodiment of <FIG>) being formed or defined between the undercuts 330a, 330b. Relative to a rotational direction defined by revolution of the connector structure <NUM> about the spout <NUM> (i.e., clockwise or counterclockwise), the first contact surface 332a extends circumferentially in the clockwise direction from the first undercut 330a to the second undercut 330b and has a geometry generating a lead-in region 334a and a ramp region 336a. Relative to the clockwise direction, then, the lead-in region 334a is "ahead" or "upstream" of the ramp region 336a. The second contact surface 332b (or any additional contact surfaces) can be similar to the first contact surface 332a; in this case, the second contact surface 332b extends circumferentially in the clockwise direction from the second undercut 330b to the first undercut 330a, and has a geometry generating a lead-in region 334b and a ramp region 336b.

The contact surfaces 332a, 332b (where two are provided) can be substantially identical in some embodiments such that the following description of the second contact surface 332b applies equally to the first contact surface 332a. As best reflected by the cross-sectional view of <FIG>, a major plane of the lead-in region 334b can be substantially flat (i.e., within <NUM>% of a truly flat shape) and substantially perpendicular (i.e., within <NUM>% of a truly perpendicular relationship) to the longitudinal axis A. The ramp region 336b tapers longitudinally downward (relative to the generally upright orientation of <FIG>) in extension from the lead-in region 334b to the first undercut 330a, creating a partial helical shape. Thus, the lead-in region 334b is longitudinally or vertically "above" the ramp region 336b (relative to the generally upright orientation of <FIG>), and a major plane of the ramp region 336b is oblique to the major plane of the lead-in region 334b (and is not substantially perpendicular to the longitudinal axis A).

Geometry features generated by the first undercut 330a are provided by <FIG>, it being understood that the second undercut 330b (<FIG>) can have a substantially identical configuration. Commensurate with the above descriptions, the first undercut 330a is formed at, or defines, a transition between the ramp region 336b of the second contact surface 332b and the lead-in region 334a of the first contact surface 332a. A shoulder or retention feature 340a is defined by the undercut 330a, extending between a leading end <NUM> of the first contact surface 332a and a trailing end <NUM> of the second contact surface 332b. A major plane of the shoulder 340a is non-parallel relative to the major plane of the lead-in region 334a and relative to the major plane of the ramp region 336b, with the shoulder 340a projecting outwardly above the second contact surface ramp region 336b. The shoulder 340a can define the axial retention surface and stop surface as described above.

With continued reference to <FIG>, while the first connection format <NUM> has been described as including two of the undercuts 330a, 330b (and two of the retention members 312a, 312b), in other embodiments one or three or more undercuts can be formed (and a corresponding number of retention members). Where more than one is provided, the undercuts 330a, 330b may be equidistantly spaced along a circumference of the connector structure <NUM> in some embodiments. Further, while the platform <NUM> and the connector structure <NUM> have been shown as being circular in nature, other shapes are also acceptable. For example, a shape of the connector structure <NUM> can be an ellipse, a polygon, a complex shape such as a combination of the aforementioned, etc..

The retention members 312a, 312b (where two or more are provided) can be identical such that the following description of the first retention member 312a applies equally to the second retention member 312b. Relative to the rotational direction described above, the first retention member 312a can be viewed as defining opposing, first and second ends 370a, 372a. The retention member 312a includes an arm 380a and a tab 382a. The arm 380a is radially spaced from the spout <NUM>, and projects upwardly from the wall <NUM>. One or more reinforcement struts 384a are optionally provided between the arm 380a and the wall <NUM>, serving to bias or reinforce the arm 380a to the upright orientation shown. The tab 382a projects radially inwardly from the arm 380a opposite the wall <NUM>. As best seen in <FIG>, the first retention member 312a is associated with the first contact surface 332a, with a capture region 386a being defined by the contact surface 332a, the arm 380a and the tab 382a for receiving a corresponding feature of the second connection format <NUM> (<FIG>).

More particularly, projection of the arm 380a defines an engagement surface <NUM>. The engagement surface <NUM> faces, and is radially spaced from, the spout <NUM>. The tab 382a projects radially inwardly relative to the engagement surface <NUM>, and defines a guide surface <NUM> and an alignment surface <NUM>. The guide surface <NUM> faces the contact surface 332a, and is longitudinally spaced from the contact surface 332a by a longitudinal spacing L. The contact surface 332a, the engagement surface <NUM> and the guide surface <NUM> combine to define the capture region 386a. The alignment surface <NUM> faces, and is radially spaced from, the spout <NUM>. Dimensions of the engagement surface <NUM> and of the alignment surface <NUM> relative to the longitudinal axis A correspond with geometry features of the adaptor <NUM> (<FIG>). In this regard, and with specific reference to <FIG>, the engagement surfaces <NUM> collectively define, relative to the longitudinal axis A, a capture diameter D that is selected in accordance with geometry features of the adaptor <NUM> to facilitate desired coupling and up-coupling operations as described below.

Geometry of the contact surface 332a and the retention member 312a is configured to facilitate locked engagement with corresponding features of the second connection format <NUM> within the capture region 386a, as well as to facilitate coupling and un-coupling operations. With reference to <FIG> (that otherwise provides a portion of a cross-sectional plane passing through the arm 380a, 380b of the first and second retention members 312a, 312b), a position of the arm 380a relative to the first contact surface 332a is in general alignment with the point of transition from the lead-in region 334a and the ramp region 336a. In some embodiments, the engagement surface <NUM> defined by the arm 380a has a convex shape in a plane perpendicular to the longitudinal axis A (i.e., the plane of <FIG>), incrementally projecting or tapering toward the longitudinal axis A from the first end 370a to an intermediate point <NUM>. The engagement surface <NUM> can optionally project or taper inwardly away from the longitudinal axis A from the intermediate point <NUM> to the second end 372a. Regardless, a shape of the engagement surface <NUM> promotes locked interface with corresponding features of the second connection format <NUM> (<FIG>) as described below.

In addition, and with reference to <FIG>, the tab 382a projects over the contact surface 332a at the transition between the lead-in region 334a and the ramp region 336a. Stated otherwise, the first end 370a of the retention member 312a is aligned with the lead-in region 334a, and the second end 372a is aligned with the ramp region 336a. Thus, at the first end 370a, the guide surface <NUM> projects over the lead-in region 334a and at the second end 372a, the guide surface <NUM> projects over the ramp region 336a. A major plane of the guide surface <NUM> in extension from the first end 370a can be substantially flat or planar (i.e., within <NUM>% of a truly flat or planar arrangement), and can be substantially parallel (i.e., within <NUM>% of a truly parallel relationship) with the major plane of the lead-in region 334a. With this construction, the longitudinal spacing L is substantially uniform along the lead-in region 334a. As described above, the major plane of the ramp region 336a is oblique with respect to the major plane of the lead-in region 334a, and thus is also oblique with respect to the major plane of the guide surface <NUM>. Thus, the longitudinal spacing L increases along the ramp region 336a, from the lead-in region 334a to the second end 372a, and corresponds with geometry features of the second connection format <NUM> (<FIG>) to promote a rotational interface as described below.

With additional reference to <FIG>, the contact surface 332a, 332b and the corresponding retention member 312a, 312b are arranged such that the uniform, then expanding shape of the corresponding capture region 386a, 386b is in the same rotational direction relative to the longitudinal axis A. For example, relative to the orientation of <FIG>, the first end 370a of the first retention member 312a is aligned with the lead-in region 334a of the first contact surface 332a, and is rotationally "ahead" of the corresponding second end 372a and ramp region 336a in the clockwise direction; similarly, the first end 370b of the second retention member 312b is aligned with the lead-in region 334b of the second contact surface 332b, and is rotationally "ahead" of the corresponding second end 372b and ramp region 336b in the clockwise direction. <FIG> further reflects that in some embodiments, the alignment surface <NUM> (not numbered in <FIG>) of the tab 382a, 382b of each retention member 312a, 312b can be curved (e.g., convex curvature) in a plane perpendicular to the longitudinal axis A.

While <FIG> illustrate the first connection format <NUM> as including two of the retention members 312a, 312b, in other embodiments one or three or more of the retention members are provided (commensurate with the number of the contact surfaces 332a, 332b). The retention members 312a, 312b are optionally equidistantly spaced about the spout <NUM> in some embodiments. Regardless, an open zone is defined between circumferentially adjacent ones of the retention members 312a, 312b for reasons made clear below.

In some embodiments, the lid <NUM> (and thus the first connection format <NUM>) is a plastic injection molded component. Under these circumstances, the one or more undercuts 330a, 330b are readily generated with conventional injection molding systems, locating the one or more undercuts 330a, 330b along or in alignment with the tool slide path or slide direction, for example circumferentially off-set (e.g., <NUM> degrees) from a corresponding one of the retention members 312a, 312b. As a point of reference, with the non-limiting example of <FIG>, two of the retention members 312a, 312b are provided and are formed at a parting line (identified at <NUM> in <FIG>) in the injection molding tooling; the undercuts 330a, 330b can be <NUM> degrees to the parting line <NUM> in some embodiments and in alignment with the slides of the tool. Thus, the one or more undercuts 330a, 330b (and other features associated with connection formats of the present disclosure) are highly viable with injection molding, requiring no complex or substantive changes to conventional injection molding tool formats (that is otherwise designed for injection molding a lid including the one or more retention members 312a, 312b). Other manufacturing techniques and materials are also acceptable, and the lids (and corresponding connection format) of the present disclosure are not limited to plastic injection molding.

Returning to <FIG>, the adaptor <NUM> can be akin to the adaptor <NUM> (<FIG>) described above, and generally includes the second connection format <NUM> and a tubular member <NUM>. The tubular member <NUM> can include any of the features described above with respect to the tubular member <NUM> (<FIG>). The second connection format <NUM> includes a base <NUM> and one or more lock structures (such as the lock structures 412a, 412b illustrated in the non-limiting example of <FIG>). In general terms, the base <NUM> forms a connector structure <NUM> (referenced generally) configured for complementary interface with the lid connector structure <NUM>. The one or more lock structures 412a, 412b are configured to selectively interface with corresponding ones of the one or more retention members 312a, 312b as described below.

The adaptor <NUM> is shown in greater detail in <FIG>. The base <NUM> includes a ring <NUM> and a flange <NUM>. As best shown in <FIG>, the ring <NUM> and the flange <NUM> combine to define a chamber <NUM> that is open to the passageway of the tubular member <NUM> and that is configured to receive the spout <NUM> (<FIG>) of the lid <NUM> (<FIG>). The flange <NUM> projects longitudinally (relative to a central axis X of the adaptor <NUM>) from the ring <NUM>, and terminates at or defines the connector structure <NUM> opposite the tubular member <NUM>. Further, the flange <NUM> extends radially from the ring <NUM> to define a peripheral edge <NUM> (referenced generally). The peripheral edge <NUM> can have a complex shape (best reflected by the bottom view of <FIG>) that generates the one or more lock structures 412a, 412b as described in greater detail below.

Geometry features of the connector structure <NUM> are commensurate with those described above with respect to the connector structure <NUM> (<FIG>) of the first connection format <NUM> (<FIG>). For example, at least one trapping region or undercut (such as the first and second trapping regions or undercuts 430a, 430b illustrated in the non-limiting example of <FIG>) are formed along the connector structure <NUM>, with at least one contact or bearing face (such as the first and second contact or bearing faces 432a, 432b illustrated in the non-limiting example of <FIG>) being formed or defined between the undercuts 430a, 430b. The shape of the one or more contact faces 432a, 432b corresponds with the one or more first connection format contact surfaces 332a, 332b as described above, with at least one of the contact faces 432a, 432b including or defining a lead-in section 434a, 434b and a ramp section 436a, 436b. The circumferential location and shape of the undercuts 430a, 430b (where two are provided) corresponds with the first connection format undercuts 330a, 330b (<FIG>) as described above. A shape of at least one, optionally all, of the undercuts 430a, 430b establishes a finger or retention feature 440a, 440b at the transition between the first and second contact faces 432a, 432b. For example, and as identified in <FIG>, the finger 440b defined at the second undercut 430b extends between a leading end <NUM> of the second contact face 432b and a trailing end <NUM> of the first contact face 432a. A major plane of the finger 440b is non-parallel relative to the major plane of the lead-in section 434b and relative to the major plane of the ramp section 436a, with the finger 440b projecting outwardly over the first contact face lead-in section 434a. With additional reference to <FIG>, an angular orientation of the finger 440b relative to the major plane of the ramp section 436a corresponds with an angular orientation of the shoulder 340a relative to the ramp region 336b. The finger 440b can define the axial retention surface and stop surface as described above.

Returning to <FIG>, while the second connection format <NUM> has been described as including two of the undercuts 430a, 430b (and two of the contact faces 432a, 432b), in other embodiments one or three or more undercuts can be formed (and a corresponding number of contact faces), corresponding with the undercut construction of the first connection format <NUM> (<FIG>). Further, while the base <NUM> and the connector structure <NUM> have been shown as being circular in nature, other shapes are also acceptable, corresponding with a shape of the first connection format <NUM>.

With specific reference to <FIG> and as mentioned above, a shape or geometry of the peripheral edge <NUM> of the flange <NUM> generates the one or more lock structures 412a, 412b as well as other features promoting coupling and un-coupling of the lock structures 412a, 412b with a corresponding one of the lid retention members 312a, 312b (<FIG>). The lock structures 412a, 412b can be identical in some embodiments, such that the following description of the first lock structure 412a applies equally to the second lock structure 412b. The first lock structure 412a represents a radially outward projection (relative to the central axis X) of the flange <NUM>. Relative to a circumferential or rotational direction defined by a shape of the flange <NUM> about the central axis X, the first lock structure 412a is <NUM> degrees off-set from the first and second undercuts 430a, 430b. The first lock structure 412a terminates at an abutment face <NUM> that otherwise defines a maximum radius (relative to the central axis X) of the peripheral edge <NUM>. The abutment faces <NUM> combine to define a maximum outer diameter OD of the flange <NUM>.

To facilitate insertion of the abutment face <NUM> into engagement with one of the retention members 312a, 312b with rotation of the adaptor <NUM> relative to the lid <NUM> (<FIG>) and/or vice-versa, additional geometry features can be incorporated into the peripheral edge <NUM> "upstream" of the first lock structure 412a (and the second locking structure 412b) in the counterclockwise direction (relative to the bottom view of <FIG>). For example, a leading side 502a of the first lock structure 412a tapers radially inwardly from the abutment face <NUM>. A flat 504a extends from the leading side 502a opposite the abutment face <NUM> in the counterclockwise direction. An insertion recess 506a is formed as a concave curvature in the peripheral edge <NUM> "ahead" (relative to the counterclockwise direction of <FIG>) of the flat 504a, and is sized and shaped to slidably receive the tab 382a, 382b (<FIG>) of one of the retention members 312a, 312b. As a point of clarification, in that <FIG> is a bottom view of the adaptor <NUM>, the rotational designations in the above descriptions are reversed when considering the adaptor <NUM> from a top view (e.g., relative to a top view of the adaptor <NUM> (that would otherwise coincide with previous descriptions of the lid <NUM>), the insertion recess 506a and the flat 504a are "ahead" of the lock structure 412a in the clockwise direction). A leading side 502b, a flat 504b, and an insertion recess 506b are similarly associated with the second lock structure 412b. The flange <NUM> can optionally include one or more additional geometry features along the peripheral edge <NUM> (e.g., secondary projections <NUM> and secondary recesses <NUM> are depicted in <FIG> but can be omitted in other embodiments). Finally, and as identified in <FIG>, a thickness (or height) T of the flange <NUM> at least at the lock structures 412a, 412b is slightly less than the longitudinal spacing L (<FIG>) of each of the retention members 312a, 312b along the corresponding lead-in region 334a, 334b (<FIG>) for reasons made clear below.

With reference to <FIG>, coupling of the lid <NUM> and the adaptor <NUM> is commensurate with previous explanations. First, the adaptor <NUM> is aligned with the spout <NUM>. In this regard, and as reflected by <FIG>, the lid <NUM> and the adaptor <NUM> are rotationally arranged relative to one another such that each of the insertion recesses 506a, 506b is aligned with a corresponding one of the retention member tabs 382a, 382b.

The lid <NUM> and the adaptor <NUM> are then directed toward one another, with the retention member tabs 382a, 382b being slidably received within a corresponding one of the insertion recesses 506a, 506b as reflected by <FIG>. This initial insertion operation brings the connector structure <NUM> of the adaptor <NUM> into contact with the connector structure <NUM> of the lid <NUM>. The spout <NUM> (hidden <FIG>) is nested within the base <NUM> of the adaptor <NUM>, with the longitudinal axis A of the lid <NUM> being aligned with the central axis X of the adaptor <NUM>. Due to the rotational arrangement dictated by placement of the retention member tabs 382a, 382b within the insertion recesses 506a, 506b, the adaptor connector structure <NUM> does not initially mesh with the lid connector structure <NUM>. For example, <FIG> illustrates that the first finger 440a is rotationally off-set from the first shoulder 340a, and bears against or is contact with the ramp region 336a of the first contact surface 332a. Though not directly visible in the drawings, a similar relationship is established at between the second finger 440b and the second contact surface 332b. Stated otherwise, in the initial assembly state of <FIG>, the adaptor undercuts 430a, 430b (one of which is visible in <FIG>) and fingers 440a, 440b are vertically "above" the lid undercuts 330a, 330b.

The adaptor <NUM> is then rotated relative to the lid <NUM> (and/or vice-versa) with at least a slight compression force being maintained (e.g., gravity, user-applied force, etc.), directing each of the lock structures 412a, 412b toward a corresponding one of the retention members 312a, 312b, and each of the adaptor fingers 440a, 440b (one of which is visible in <FIG>) toward a corresponding one of the lid undercuts 330a, 330b. For example, and with reference to the second contact surface 332b and the second contact face 432b identified in <FIG>, the adaptor <NUM> has been rotated (clockwise) from the initial assembly state of <FIG> such that the finger 440a is approaching (and will later enter) the lid first undercut 330a. Due to the sliding interface between the adaptor ramp section 436b and the lid ramp region 336b (and corresponding helical-like shapes), as the adaptor <NUM> is rotated, the adaptor <NUM> vertically drops or lower relative to the lid <NUM> such that as the finger 440a nears the lid first undercut 330a, the finger 440a comes into alignment with the lid shoulder 340a. Interface between the flange <NUM> and the retention member tabs 382a, 382b, and in particular with the corresponding guide surface <NUM> (<FIG>), ensures that the adaptor ramp sections 436a, 436b track along the corresponding lid ramp regions 336a, 336b with rotation of the lid <NUM> and the adaptor <NUM> relative to each other. Rotation of the components <NUM>, <NUM> relative to each other also directs the leading side 502a of the first lock structure 412a toward the first end 370a of the first retention member 312a, and the leading side 502b of the second lock structure 412b toward the first end 370b of the second retention member 312b.

With continued rotation of the adaptor <NUM> relative to the lid <NUM> (and/or vice-versa), each of the lock structures 412a, 412b enters the capture region 386a, 386b (hidden in <FIG>, but shown, for example, in <FIG>) of the corresponding retention member 312a, 312b, with the abutment face <NUM> of each of the lock structures 412a, 412b becoming frictionally and mechanically locked against the engagement face <NUM> (<FIG>) of the corresponding retention member 312a, 312b. For example, <FIG> generally illustrate a locked state of the lid <NUM> and the adaptor <NUM>. As a point of reference, the maximum outer diameter OD (<FIG>) collectively defined by the lock structures 412a, 412b is greater than the capture diameter D (FIG. 16C) collectively defined by the retention members 312a, 312b; thus, as the lock structures 412a, 412b are directed into engagement with the corresponding retention member 312a, 312b, the retention members 312a, 312b are forced to deflect slightly radially outwardly to securely retain the lock structures 412a, 412b. Moreover, and as best understood with cross-reference between <FIG> and <FIG>, the thickness T of the lock structures 412a, 412b is slightly less than the longitudinal spacing L of the retention members 312a, 312b such that each lock structure 412a, 412b readily enters the corresponding retention member capture region 386a, 386b with rotation of the lid <NUM> and the adaptor <NUM> relative to one another. Further, and returning to <FIG>, the lid connector structure <NUM> (<FIG>) engages the adaptor connector structure <NUM> (<FIG>) at the corresponding undercuts 330a, 330b, 430a, 430b (it being understood that the undercuts 330a, 330b, 430a, 430b are primarily hidden in <FIG>). For example, the adaptor first finger 440a is lodged within the lid first undercut 330a, and the lid first shoulder 340a is lodged within the adaptor first undercut 430a; the adaptor first finger 440a bears against the lid first shoulder 340a. Though not visible, a similar relationship exists at an interface between the lid second undercut 330b and the adaptor second undercut 430b.

In more general terms, and with additional reference to <FIG>, as the lid <NUM> is rotated on to the adaptor <NUM> (and/or vice-versa), interface between the lid ramp region 336a, 336b and the corresponding adaptor ramp section 436a, 436b guides the lid undercut 330a, 330b into the corresponding, mating adaptor undercut 430a, 430b (and vice-versa). The downward angular orientation (in the direction of rotation) of the shoulders 340a, 340b relative to a plane perpendicular to the axis of rotation dictates that as the fingers 440a, 440b are progressively advanced along the corresponding shoulder 340a, 340b, the adaptor <NUM> is pulled or drawn downwardly (relative to the orientation of <FIG>) on to the lid <NUM>, promoting a liquid-tight seal between the components. The undercuts 330a, 330b, 430a, 430b act as end stops to rotational motion of the adaptor <NUM> relative to the lid <NUM> (and/or vice-versa).

Engagement between corresponding ones of the lid undercuts 330a, 330b and the adaptor undercuts 430a, 430b enhances retention of the adaptor <NUM> to the lid <NUM> as otherwise provided by the locked interface between the lock structure 412a, 412b and corresponding retention member 312a, 312b; further, interface between the lid connector structure <NUM> and the adaptor connector structure <NUM> provides stability of the lid <NUM> on the adaptor <NUM> (and vice-versa) in an axis perpendicular to the longitudinal axis L. The ramping geometry of the connector structures <NUM>, <NUM> facilitates uncoupling of the lid <NUM> from the adaptor <NUM> through axial rotation in some embodiments. In this regard, it will be recalled that in some embodiments, sealing features can be provided that promote a liquid-tight seal between the lid <NUM> and the adaptor <NUM> in the locked state. The liquid-tight seal can be difficult to break; however, as the adaptor <NUM> is rotated relative to the lid <NUM> from the locked state (and/or vice-versa), the adaptor <NUM> is ramped up and off of the sealing feature, aiding in removing the adaptor <NUM> from the lid <NUM>.

While the above descriptions have provided the complementary second connection format <NUM> (<FIG>) as part of the adaptor <NUM>, other configurations are also acceptable. For example, the second connection format <NUM> can be permanently assembled to or provided as an integral part of a spray gun (e.g., the second connection format <NUM> as described above can be provided as or at the inlet port <NUM> (<FIG>) of the spray gun <NUM> (<FIG>)).

Any of the complementary connection formats described in the present disclosure may be formed integrally with a remainder of the corresponding lid. Alternatively, these components may be initially formed as a separate, modular part or assembly comprising connection geometry to permit connection to a remainder of the lid. For example, a modular lid assembly <NUM> is shown in <FIG> and includes a modular liquid outlet <NUM> and a modular lid base <NUM>. The modular components <NUM>, <NUM> are separately formed and subsequently assembled. In general terms, the modular liquid outlet <NUM> includes a stage <NUM>, a liquid outlet <NUM> and components of a connection format <NUM> (referenced generally). The stage <NUM> is sized and shaped in accordance with a corresponding feature of the modular lid base <NUM> described below, and supports the liquid outlet <NUM> and the connection format <NUM>. The liquid outlet <NUM> and the connection format <NUM> can assume any of the forms described above, and in the non-limiting example of <FIG>, can be the first connection format <NUM> (<FIG>) as described above. Any other connection format described herein can alternatively be incorporated into the modular liquid outlet <NUM>.

The modular lid base <NUM> generally includes a wall <NUM> and a rim <NUM> projecting from the wall <NUM>. The wall <NUM> forms a central opening <NUM>, and is sized and shaped in accordance with a size and shape of the stage <NUM>. The central opening <NUM> can assume various shapes and sizes, but is generally configured such that an outer diameter of the opening <NUM> is greater than an inner diameter of the liquid outlet <NUM>, and less than an outer diameter of the stage <NUM>.

Assembly of the modular lid assembly <NUM> includes securing the stage <NUM> on to the wall <NUM>, with the central opening <NUM> being open to the liquid outlet <NUM>. The modular liquid outlet <NUM> is secured to the modular lid base <NUM> by way of welding and/or an adhesive or the like in some embodiments. In some embodiments, the adhesive joint and/or weld joint act to both retain and create a liquid-tight seal upon assembly of the modular liquid outlet <NUM> to the modular lid base <NUM>. Other attachment techniques are also acceptable, such as quarter turn locking, provision of mechanical locking mechanisms, threaded, snap fit, other mechanical fasteners (e.g., screws, rivets and/or molded posts that are cold formed/hot formed and mushroomed down to hold/retain the component(s) in place and provide a suitable leak-proof seal).

Constructing the lid <NUM> using a modular liquid outlet <NUM> and a modular lid base <NUM> can provide an advantage of allowing more complex geometries to be feasibly created than may otherwise be possible using, e.g., injection molding. For example, in a given lid <NUM>, it may be impossible to form a particular geometry in an injection molded part due to the locations of mold parting lies and the necessary trajectory of slides required to form certain features. However, if the lid <NUM> is split into modular components, tooling can be designed to directly access surfaces of each modular component that would not have been accessible on the one-piece lid. Thus, further geometric complexity can be achieved. In other embodiments, a modular kit can be provided, including two or more differently-formatted modular lid outlets that are color coded for particular end-use applications.

The modular lid components <NUM>, <NUM> may also be constructed of different materials as desirable for the application. For example, it may be desirable to use an engineering plastic for the modular liquid outlet <NUM> (due the strength and tolerances required for a secure and durable connection to the spray gun), while lower cost polymers could be used for the modular lid base <NUM>.

In other embodiments, the modular liquid outlet <NUM> provided as above could alternatively be attached or preassembled to the end of a paint supply line or pouch etc. and in turn connected to the spray gun paint inlet port. In this way, paint could be supplied directly to the spray gun without the need for the modular lid base <NUM> (or other reservoir components).

Claim 1:
A reservoir component provided as part of a spray gun reservoir for containing a supply of liquid, the reservoir component comprising:
a spout (<NUM>);
a platform (<NUM>) projecting from an outer face (<NUM>) of the reservoir component at a location external the spout (<NUM>);
a connector format (<NUM>) having a connector structure (<NUM>) including a first undercut (130a) and a first contact surface (132b), wherein the first contact surface (132b) defines a ramp region (136b), and
further wherein the first undercut (130a) is formed at an end of the ramp region (136b);
wherein the connector structure (<NUM>) is configured for mating interface with a complementary connector structure of a spray gun inlet, wherein the reservoir component is a lid (<NUM>); and
wherein the platform (<NUM>) forms the connector structure (<NUM>).