PNEUMATIC GAUGE AND PRESSURE CONTROL DEVICE AND PNEUMATIC SYSTEM INCLUDING SAME

A pneumatic gauge and pressure control device includes a pneumatic gauge that is manually movable from a neutral position to: (i) a fill position for compressed air to flow from a compressed air source into a system; or (ii) a vent position for compressed air to be vented from the system. The pneumatic gauge can rotate or slide from the neutral position to the fill and vent positions. A method for controlling a flow of compressed air with respect to a pneumatic system includes manually moving a pneumatic pressure gauge from a neutral position to a fill position to cause compressed air to be communicated from an associated compressed air source into the pneumatic system and/or moving the pneumatic gauge from the neutral position or from the fill position to a vent position to cause compressed air to be vented from the pneumatic system.

FIELD

The present development relates to the field of pneumatic gauges and control systems for vehicles and other applications. More particularly, the present development relates to a combined pneumatic gauge and pressure control device that provides a novel and nonobvious device and method for controlling the flow of pressurized air from a source to a destination device or system such as an air spring, tire, or other pneumatic chamber and for controlling the venting of pressurized air from the air spring, tire, or other pneumatic chamber of a device or system. The destination device or system such as a tire, air spring or other pneumatic chamber can be a component of a commercial vehicle or passenger vehicle or can be a part of a non-vehicular pneumatic system such as industrial or manufacturing equipment, motion control systems, or other applications. The development is described herein with primary reference to vehicle air springs but those of ordinary skill in the art will recognize that it can be used in connection with other vehicle-based or non-vehicle pneumatic systems or devices where pressurized air must be selectively communicated to and vented from a chamber or other system or destination.

BACKGROUND

Existing pneumatic control systems for air springs or other systems use a mounted pressure gauge to detect and display the air pressure contained in the air spring or other system and include a separate pneumatic control system including an electrical switch and/or a pneumatic valve actuator that can be located adjacent the gauge or remote from the gauge for controlling the flow of pressurized air into the air spring or other system or device from a compressed air source and for venting pressurized air from the air spring or other system or device to the atmosphere. In some cases, the control system comprises a manually controlled pneumatic valve including an actuator to be manually operated by a user. In other applications, the control system comprises a solenoid valve or other electro-mechanically actuated pneumatic valve and an electrical switch to be operated by a user. In other designs, an electrical switch operated by the user directly controls the operation of an air compressor that feeds compressed air to the system.

These known designs have been found to be suboptimal for a wide variety of reasons including the need to provide a system with a pressure control switch or actuator that is separate from the pressure gauge itself. As such, a need has been identified for a new and improved pneumatic gauge and pressure control device that overcomes this deficiency and others associated with known systems while providing superior overall results.

SUMMARY OF THE PRESENT DEVELOPMENT

In accordance with one aspect of the present development, a pneumatic gauge and pressure control device includes a pneumatic gauge that is manually movable from a neutral position to either: (i) a fill position in which the pneumatic gauge and pressure control device causes compressed air to be communicated from an associated compressed air source into an associated device or system; (ii) a vent position in which the pneumatic gauge and pressure control device causes compressed air to be vented from the associated device or system.

In accordance with another aspect of the present development, the pneumatic gauge of the device is rotatable about an axis from the neutral position to the fill position and the vent position or is slidable along an axis from the neutral position to the fill position and the vent position.

In accordance with a further aspect of the present development a method for controlling a flow of compressed air with respect to a pneumatic system includes manually moving a pneumatic pressure gauge from a neutral position to a fill position to cause compressed air to be communicated from an associated compressed air source into the pneumatic system.

In accordance with another aspect of the present development, the method further includes manually moving the pneumatic gauge from the neutral position or from the fill position to a vent position to cause compressed air to be vented from the pneumatic system.

In accordance with a further aspect of the present development, the step of manually moving the pneumatic pressure gauge comprises rotating the pneumatic pressure gauge about an axis of rotation.

DETAILED DESCRIPTION

FIGS.1-3are respective front, rear, and exploded isometric views of a pneumatic gauge and pressure control device D provided in accordance with an embodiment of the present development. The device comprises a first or outer body10that can comprise a cup-like structure including an annular wall10athat includes an outer surface10bthat can be cylindrical or otherwise shaped and that comprises an inner surface10cthat can be cylindrical or otherwise conformed to define a main bore10d. The first body10comprises an inner end wall10ethat extends across and at least partially closes an inner end10f(see alsoFIG.6A) of the main bore10d, and the opposite outer end10gof the main bore10dcan be open. The first/outer body10can be a one-piece molded polymeric structure or can be assembled from two or more polymeric, metallic and/or other first body pieces.

With particular reference toFIGS.3&4, the device D further comprises a second or inner body12that is at least partially or fully installed in the main bore10dof the first body10and supported for at least limited angular rotation relative to the first body10about an axis of rotation X. As shown in the illustrated embodiment, the second body12is coaxially installed in the main bore10d. The second body12comprises a main wall12gthat can be circular in its peripheral shape or otherwise shaped at its periphery. In the illustrated embodiment ofFIGS.3-4, the second body12can be generally cup-shaped and can comprise an annular wall12aconnected to and projecting axially outward from the main wall12gand that can be circumferentially continuous or that can include first and second cylindrical or otherwise conformed wall segments12b1,12b2circumferentially separated by one or more gaps12c. The second body annular wall12acan comprise an outer surface12dthat can be cylindrical or otherwise shaped (as shown it includes a plurality of axially extending ribs12r) and comprises an inner surface12ethat can be cylindrical or otherwise conformed to define an interior space such as a secondary bore12f. The main wall12gcan extend across and at least partially close an inner end12h(FIG.4) of the secondary bore12fso as to provide and act as an inner end wall. The second body12can be a one-piece molded polymeric structure or can be assembled from two or more polymeric, metallic and/or other first body pieces. As noted, the second body12is rotatably supported relative to the first body10for at least limited angular rotation relative to the first body10about an axis of rotation X which also defines a longitudinal axis of the device D. As described in detail below with reference toFIGS.13to18, the second body12can alternatively omit the annular wall12a(i.e., omit the wall segments12b1,12b2) such that the second body12comprises the main wall12gin the form of a disc-shaped body.

The pneumatic gauge and pressure control device D comprises a pneumatic pressure gauge14(FIGS.1-3) that can be a mechanical analog pressure gauge or a battery-operated digital pressure gauge. The pressure gauge includes an inlet fitting14iconfigured to fluidically connect with a pneumatic system associated with and/or including the pneumatic gauge and pressure control device D and includes a face14fthat provides an analog or digital indication of pneumatic pressure sensed at the inlet fitting14i. The pressure gauge14is operatively connected to the second body12for rotation therewith such that manual angular or rotational movement of the pressure gauge14about the axis X by a user causes or induces corresponding angular movement or rotation of the second body12about the axis of rotation X relative to the first body10together with the pressure gauge14and, correspondingly, manual angular or rotational movement of the second body12about the axis of rotation X by a user causes or induces corresponding angular movement or rotation of the pressure gauge14about the axis of rotation X relative to the first body10together with the second body12.

The pneumatic gauge and pressure control device D can comprise a gauge plate16or gauge mounting plate16that is operatively non-rotatably connected to the second body12so as to rotate together with the second body about the axis of rotation X and that can extend across and at least partially close an open outer end12jof the second bore12fto provide a mounting location for the pneumatic pressure gauge14so that the pressure gauge14can be operatively non-rotatably connected to the second body12for rotation therewith about the axis of rotation X. The gauge plate16can be snap-fit, friction fit, interlocked, engaged, welded, adhesively secured and/or otherwise non-rotatably secured or connected to the second body12as an assembly as shown herein or it can alternatively be formed as part of the second body12. e.g., as a one-piece construction together with the second body12or any part of the second body12. In the illustrated example, the pressure gauge14comprises an externally threaded male inlet fitting14ithat is threaded into and engaged with an internally threaded female gauge mounting aperture16aof the gauge plate16. The threaded male fitting14iis firmly engaged in the mounting aperture16aby friction and/or by using adhesive so that during normal operative use of the device D, manual rotation of the pressure gauge14in clockwise or counter-clockwise directions about the axis of rotation X causes corresponding 1:1 rotation of the gauge plate16and second body12about the axis of rotation X without any relative rotational movement between the fitting14iand threaded aperture16aof the gauge plate16as would lead to loosening or disconnection of the pressure gauge14from the threaded aperture16aof the gauge plate16, although the pressure gauge14can be intentionally unthreaded from the aperture16aof the gauge plate for repair and/or replacement by restraining the gauge plate16and second body12and using force beyond normal operative force to unthread the pressure gauge from the gauge plate16. In an alternative embodiment, the pressure gauge inlet fitting14ican be interference fit or press-fit or otherwise non-rotatably connected to the gauge plate16for rotation therewith and/or the pressure gauge inlet fitting14ican comprise a hexagonal or other non-circular outer shape that is non-rotatably keyed to the gauge plate aperture16ato ensure that the pressure gauge14and gauge plate16rotate together when the pressure gauge14is operatively connected to the gauge plate16. The threaded gauge plate aperture16acan be molded as part of the polymeric structure of the gauge plate or a metal nut or other metallic or non-metallic female aperture insert can be included to provide the threaded aperture16a.

With brief reference toFIGS.6A &6B, the gauge plate16comprises a gauge air inlet passage16pthat extends between the gauge plate aperture16aand an inner face16fof the gauge plate16such that the gauge inlet passage16pextends through the gauge plate16. In the illustrated embodiment, the inner face16fof the gauge plate16comprises a projecting boss16kthat projects inwardly into the secondary bore12ftoward the end wall12gof the second body12, and the gauge inlet passage16pextends from the gauge plate aperture16athrough the boss16kand opens through the inner face16f.

Referring again toFIGS.1-3, the pneumatic gauge and pressure control device D includes an annular bezel20that can be selectively connected to the first or outer body10by a bezel mount or bayonet mount22as shown or that is press-fit, adhesively secured, threadably secured, fastened, or otherwise selectively secured or connected to the first body10to capture the second/inner body12axially to the first body10such as in the bore10dof the first body10while still allowing relative rotation between the second body12and first body10.

The illustrated embodiment of the pneumatic gauge and pressure control device D includes one or more optional mounting fasteners F (two are shown) that extend through the inner end wall10eof the first or outer body10and project outwardly therefrom away from the end wall10e. The or each fastener F can be insert molded, press-fit or otherwise non-rotatably and fixedly secured to the end wall10eand can be threaded to receive an associated nut N (see e.g.,FIGS.1and6B) that can be used to mount the main/outer body10to a vehicle dashboard, console, trailer frame, machine chassis, or any other suitable mounting structure or location. In the illustrated example, the device D further comprises an optional mounting bracket K (not shown inFIG.2) comprising an annular collar K1that slidably receives the first/outer body10and comprises a base K2connected to the collar and including fastener apertures K3through which the mounting fasteners F extend. The base K2can optionally include one or more additional apertures K4to accommodate passage of a pneumatic fitting or hose as described below.

Referring now particularly toFIG.6A, the first/outer body10can comprise a cylindrical stud or boss10kthat is formed as part of or otherwise connected to the end wall10eand that projects into the main bore10dand that includes a cylindrical or conical outer surface. The boss10kis coaxially positioned about the axis of rotation X so as to be centrally located in the main bore10d. The inner wall12gof the second/inner body12includes a mating bore or cup-shaped receiver12kwith a cylindrical or conical inner surface that corresponds with the outer surface of the boss10kand that rotatably receives the boss10kof the outer body10such that the boss10kis positioned in the receiver12kto position and rotatably support the inner body12coaxially on the axis of rotation X for rotation relative to the outer body10.

Device D preferably comprise a spring S operably engaged between the first or outer body10and the second or inner body12to bias the second or inner body member12toward its first or neutral position. In the illustrated embodiment, the spring S resiliently biases the second/inner body12toward a first or neutral position (FIGS.6,6A,6B) as described in detail below, and the spring S allows the second/inner body12to be manually rotated about the axis of rotation X from the first or neutral position: (i) in a first direction toward and into a second or fill position (FIGS.7,7A,7B); and (ii) in a second direction opposite the first direction toward and into a third or vent position (FIGS.8,8A,8B). In the illustrated example, the first direction is clockwise and the second direction is counter-clockwise, but this arrangement can be reversed without departing from the scope and intent of the present development. Also, in an alternative embodiment, the second (fill) and third (vent) positions can both be obtained by rotating the second/inner body12only in the first direction by different angular distances to reach the respective second (fill) and third (vent) positions from the first (neutral position), in which case the spring S biases the second/inner body12in an opposite second direction toward and into the first (neutral) position. In the illustrated example, spring S is a torsion spring with first and second outwardly turned or radial ends S1, S2(FIG.3). The spring S is positioned about the receiver12kof the second/inner body adjacent the wall12g. The ends S1, S2of the spring S respectively engage first and second spring stops12m,12nof the second (inner) body12as shown inFIG.4C. The first and second spring stops12m,12n(see alsoFIG.4C) are provided respectively by opposite first and second ends of an arcuate wall segment12wthat projects outwardly from the end wall12gin a position that is concentric with the receiver12k. The first/outer body10comprises first and second arcuate tabs T1, T2(FIG.4A) that project from the end wall10einto the main bore. When the second (inner) body12is operatively installed in the main bore10dof the first (outer) body10as described, these first and second arcuate tabs T1, T2are slidably received between the first and second spring stops12m,12nand the receiver12k. Accordingly, when the second/inner body12is rotated in the first direction from the first (neutral) position toward the second (fill) position, the spring ends S1, S2become resiliently engaged between the first spring stop12mand the second tab T2such that the second (inner) body12is biased in the opposite (second) direction back toward the first (neutral) position. Conversely, when the inner body12is rotated in the opposite, second direction from the first (neutral) position toward the third (vent) position, the spring ends S1, S2become resiliently engaged between the second spring stop12nand the first tab T1such that the second (inner) body12is biased in the opposite (first) direction back toward the first (neutral) position.

The device D comprises an air system fitting G that can be a straight barb fitting or any other suitable pneumatic fitting that is adapted to be connected to a pneumatic system V (seeFIGS.5A-5C) that is associated with or that includes the device D. In one non-limiting embodiment, the pneumatic system V includes one or more air springs VS, tires, or other devices or locations that receive and retain compressed air. The air system fitting G is also fluidically connected to the inlet fitting14iof the air pressure gauge14such that the air pressure gauge display14fwill display or otherwise indicate the magnitude or other indication of the level or degree of air pressure present in or at the air system fitting G. In the illustrated embodiment, the air system fitting G is connected to the end wall10eof the first (outer) body10and can be connected to and fluidically connected with a first or main or primary air outlet passage10plocated in the end wall10e. As shown inFIG.6A, the primary air outlet passage10pcan comprise an outer portion that opens through an external surface of the end wall10eand in which the system fitting G is located and an inner portion that extends inwardly through the end wall10einto the main bore10of the first body10. In the illustrated example, the air outlet passage10pis aligned with the axis of rotation X and extends coaxially through the boss10kand is aligned or registered with a closely adjacent second or secondary air outlet passage12psuch as an orifice located in the end wall12gof the second (inner) body12. An O-ring or other seal R1sealingly connects the primary and secondary air outlet passages10p,12pto block or at least inhibit escape of pressurized air while allowing relative rotation therebetween about the axis of rotation X.

Device D comprises a main airflow passage30that extends between the second (inner) body12and the gauge plate16. More particularly, the main airflow passage30extends between the secondary air outlet passage12pand the gauge inlet passage16pand fluidically connects the secondary air outlet passage12p(and also the primary air outlet passage10p) to the gauge inlet passage16psuch that the pressure gauge inlet fitting14iis in fluid communication with the secondary air outlet passage12pand the primary air outlet passage10pthrough the main airflow passage30so that the air pressure gauge14can directly sense air pressure in the primary and secondary air outlet passages10p,12pand the main passage30. The air pressure gauge14indicates or outputs the magnitude or other indication of the sensed pressure on the pressure gauge face14f. The main airflow passage30can be provided by one or more conduits, tubes, passages, orifices, and/or one or more metal or polymeric fittings such as the main fitting30fshown herein which can be a barb tee fitting as detailed below or another fitting. In the illustrated embodiment, the main fitting comprises first and second connection ports30a,30brespectively fluidically connected to the gauge inlet passage16pand the secondary air outlet passage12pto fluidically connect same.

The main airflow passage30is also fluidically connected to an airflow branch passage or distribution passage40(FIG.6A) that extends between a first end connected to the main airflow passage30and a second end connected to a distribution orifice12x(see alsoFIGS.46,4C) that extends through the inner wall12gof the second (inner) body12such that the distribution orifice12xis in fluid communication with the main airflow passage30through the distribution passage40. A straight barb or other distribution fitting12ycan be engaged with the distribution orifice12xand fluidically connected thereto. In one example, the branch or distribution passage40comprises a pipe, hose, conduit, and/or one or more fittings fluidically connected to the distribution fitting12yat one end and that is fluidically connected at its opposite end to the main airflow passage30such as by the main fitting30fso that the branch/distribution passage40and the distribution orifice12xare fluidically connected to the main airflow passage30. In one example, the main fitting30fcan be a barb “tee” fitting as shown herein including the first and second connection ports30a,30bconnected directly or indirectly respectively to the gauge inlet passage16pand the secondary air outlet passage12p, and further including a third connection30cthat is fluidically connected to the first end of the branch/distribution passage40. In another example, the main fitting30fcomprises a unitary or one-piece fitting structure that is connected between the second (inner) body12and the gauge plate16and that includes both the main airflow passage30that fluidically connects the secondary air outlet passage12pwith the gauge inlet passage16pand that also includes the branch distribution passage40that fluidically connects the main airflow passage30to the distribution orifice12x.

As described below in relation toFIGS.13-18, the main fitting30fcan comprise both the main airflow passage30and also the branch distribution passage40as shown for the alternative main fitting130fcomprising both a main airflow passage130(corresponding to the main airflow passage30of the main fitting30f) and a branch distribution passage140(corresponding to the branch distribution passage40) in fluid communication with the main airflow passage130. In the illustrated embodiment, the alternative main fitting130fcomprises a one-piece molded polymeric body130fbin which the main airflow passage130and branch airflow passage140are formed. The body130fbfurther comprises first and second connection ports130a,130blocated at opposite ends of the main airflow passage130and corresponding respectively to the first and second connection ports30a,30bof the main fitting30f.

The first or outer body10can further comprise an air inlet passage50(seeFIGS.4A,7&7A) that can include an air inlet fitting50asuch as a straight barb fitting or other fitting adapted to be connected to a hose or other conduit or pathway that provides a source of compressed air, which can be a continuous, uninterrupted source of compressed air in one embodiment or which can be a selectively available or intermittent source of compressed air as disclosed below. The air inlet passage50extends through the first (outer) body10and fluidically communicates with the main bore10d. In the illustrated example, the air inlet passage50extends through the inner end wall10e. A seal such as an O-ring seal R2can be located in or otherwise adjacent the air inlet passage50where the air inlet passage50opens into the main bore10dand sealingly engages the inner end wall12gof the second (inner) body12.

The first or outer body10also comprises a vent passage60(seeFIGS.4A,8&8A) that extends through the first (outer) body10and fluidically communicates with the main bore10dand with an external ambient atmosphere outside of the main bore10dand surrounding the outer body10. In the illustrated example, the vent passage60extends through the inner end wall10eat a location that is spaced from the air inlet passage50. In the illustrated example, the air inlet passage50and the vent passage60are both located on a single arc C centered at the axis of rotation X as can be seen inFIG.4A. A seal such as an O-ring seal R3can be located in or otherwise adjacent the vent passage60where the vent passage60opens into the main bore10dand sealingly engages the inner end wall12gof the second (inner) body12.

The device D further comprises an airflow stop AS (FIGS.4A,6A,7B) provided by a surface or structure that blocks the flow of compressed air from the distribution passage40and distribution orifice12xwhen the device D is in the first or neutral position as further described below. In the illustrated example, the airflow stop comprises a blind bore70located in the inner end wall10eof the first (outer) body10and that opens into the main bore10dbut that does not extend through the inner end wall10e. A seal such as an O-ring seal R4can be located adjacent the airflow stop/blind bore70where the airflow stop/blind bore70opens into the main bore10dand sealingly engages the inner end wall12gof the second (inner) body12. As shown in the alternative embodiment D2ofFIGS.14A &14B, the seals R2, R3, R4can be combined into a single one-piece seal element that is operatively installed onto the first body10/110.

In the illustrated example, as best seen inFIG.4A, the air inlet passage50, vent passage60, and the blind bore70or other airflow stop AS are all located in an airflow block or manifold M that is defined as part of or is connected to the first (outer) body10. More particularly, in the presently illustrated embodiment of the main body10, the manifold M is defined as part of a one-piece construction with the remainder of the first body10and is connected to an inner face of the inner end wall10ethat is oriented toward the main bore10dso that the manifold extends into and is accessible within the main bore10d. The illustrated embodiment also shows that the blind bore70or other airflow stop AS can be located between the air inlet passage50and vent passage60, also located on the single or common arc C centered at the axis of rotation X. Alternatively, the air inlet passage50and vent passage60are located adjacent each other (circumferentially successive with respect to each other) on the common arc C, with one of the air inlet passage50and vent passage60being located circumferentially between the blind bore70(airflow stop AS) and the other one of the air inlet passage50and vent passage60.

As shown inFIGS.5A-5C, the device D is adapted to be connected to and be a part of a pneumatic system PS. The pneumatic system PS comprises a compressed air source such as an air tank PS1that can be intermittently fed by an air compressor PS2or another source or supply. The tank PS1and air compressor PS2can be separate physical components or can alternatively be physically integrated into a single system to provide a source of compressed air. The compressed air source such as the tank PS1is fluidically connected by a hose or other conduit or otherwise fluidically connected to the air inlet fitting50aand air inlet passage50of the device D. The pneumatic system PS can include a destination device or system V (or subsystem V) that is adapted to receive and receives compressed air from the tank PS1or other source as controlled by the pneumatic gauge and pressure control device D or an alternative embodiment provided in accordance with another embodiment of the present development as described below. The destination device or system V is fluidically connected by a hose or other conduit to the air system fitting G and primary air outlet passage10pof the device D such that the destination device or system V is also fluidically connected to the main airflow passage30through the secondary air outlet passage12pwhich communicates with the primary air outlet passage as described above. In the illustrated example, the destination system V comprises at least one and typically two or more vehicle air springs VS such as commercial vehicle (truck) or passenger vehicle air springs VS as used for suspension components, ride-height control, cab shock-absorption, and other applications. The example of a pneumatic system PS as shown herein is not intended to limit the present development D in any way and those of ordinary skill in the art will recognize that the pneumatic system in which or in association with which the present device D is used can vary greatly without departing from the scope and intent of the present development.

FIG.5AandFIGS.6-6Bshow the device D in its first or neutral state or configuration in which the second (inner) body12is located in a first or neutral position where the distribution orifice12xis aligned with and engaged with the airflow stop AS such as the blind bore70such that flow of compressed air into or out of the distribution orifice12xand distribution passage40is blocked. As shown inFIG.6A, the O-ring seal R4sealingly engages the manifold M of the first (outer) body10with the inner end wall12gof the second (inner) body12surrounding the distribution orifice12xto block or at least substantially impede the escape of compressed air from the distribution passage40through the distribution orifice12x. The second (inner) body12can be continuously urged into this first or neutral position by the spring S. In this first or neutral position, the air pressure gauge14senses the air pressure in the air spring(s) VS or other destination system V by way of the main airflow passage30that is in communication with the gauge inlet fitting14ias described above.

FIG.5BandFIGS.7-7Bshow the device D in its second or fill state or configuration in which the second (inner) body12is manually rotated by application to rotational force on the pressure gauge14or on the second (inner) body12about the axis of rotation X against the biasing force of the spring S in a first direction Z1in the illustrated embodiment so as to be located in a second or fill position where the distribution orifice12xis aligned or registered with and engaged with the air inlet passage50such that compressed air from the tank or other source PS1flows from the air inlet passage50into the distribution orifice12xand from there into the distribution passage40and also into the main airflow passage30such that the compressed air from the source PS1received into the air inlet passage50is communicated to the air spring(s) VS or other destination system V by way of the air secondary and primary air outlet passages12p,10pand system fitting G. When manual rotational force is removed from pressure gauge14and/or second (inner) body12, the spring S resiliently returns the second (inner) body12to the first/neutral position.

FIG.5CandFIGS.8-8Bshow the device D in its third or vent state or configuration in which the second (inner) body12is manually rotated by application to rotational force on the pressure gauge14or on the second (inner) body12about the axis of rotation X against the biasing force of the spring S in a second direction Z2which is opposite the first direction Z1in the illustrated embodiment. The second (inner) body12is located in a third or vent position where the distribution orifice12xis aligned or registered with and engaged with the vent passage60of the main (outer) body10such that compressed air from the air spring(s) VS or other destination system V flows outwardly through the vent passage60by way of the primary and secondary air outlet passages10p,12p, the main airflow passage30, the distribution passage40, and the distribution orifice12xwhich is aligned with the vent passage60. When manual rotational force is removed from pressure gauge14and/or second (inner) body12, the spring S resiliently returns the second (inner) body12to the first/neutral position.

In an alternative embodiment, the arrangement of the air inlet passage50, vent passage60, and blind bore70or other air stop AS is modified such that the inner body12is rotated in only a single direction (the first direction Z1or the second direction Z2) from the first or neutral state or position ofFIG.5Ato reach both the second (fill) state or position and the third (vent) state ofFIG.5C. In such case, the second (fill) state/position and the third (vent) state/position can be arranged in any desired position relative to each other with the second (fill) state/position being located circumferentially between the first (neutral) position and the third (vent) state or with the third (vent) position being located circumferentially between the first (neutral) position and the second (fill) state. In one such example, the air inlet passage50and vent passage60are located adjacent each other (circumferentially successive with respect to each other) on the common arc C, with one of the air inlet passage50and vent passage60being located circumferentially between the blind bore70(airflow stop AS) and the other one of the air inlet passage50and vent passage60.

FIGS.9A-9Ccorrespond respectively toFIGS.5A-5Cbut show an alternative pneumatic system PS' that is identical to the pneumatic system PS except as otherwise shown and/or described herein. In the system PS′, the air tank PS1has been eliminated such that the compressed air supply system comprises an air compressor PS2having a compressed air outlet directly connected to the air inlet fitting50aand air inlet passage50by an air supply line SL which can be provided by any one or more passages, hoses, conduits, or other air flow paths. The pneumatic gauge and pressure control device D ofFIGS.5A-5Bhas been replaced by a pneumatic gauge and pressure control device D′ that is identical to the device D except that it is operably connected to a source of electrical power E which can be DC or AC power and comprises one or more mechanical or solid state (semiconductor) switches SW (i.e., a single switch SW or more than one switch SW) that selectively control operative connection of the electrical power E to the air compressor PS2. The one or more switches SW can be located within the main bore10dof the first body10and, in such case the first body10can includes one or more optional metallic electrical terminals TX molded into, assembled to, or otherwise connected to the first body10and accessible externally of main bore10doutside of the main body10for connection of electrical wires thereto (see e.g., the optional terminals TX shown inFIG.12). The electrical terminals TX can be operatively electrically connected to the switch(es) SW located in the main bore10d. With respect to the device D′, when the pneumatic gauge and pressure control device D′ is in its second (fill) state, the one or more switches SW operably connect the electrical power E to the air compressor PS2(shown with a broken line at the switch SW inFIG.9B) such that the air compressor PS2operates to supply compressed air to the air inlet passage50via air inlet fitting50athrough the supply line SL. In the first (neutral) and third (vent) operative positions of the pneumatic gauge and pressure control device D′, the one or more switches SW open or otherwise disconnect or decouple the air compressor PS2from the operative electrical power E. Optionally, in a further alternative embodiment, the air supply line SL is replaced by an air supply line SL′ (as shown inFIGS.9A-9Cwith a broken line) comprising any one or more passages, hoses, conduits, or other air flow paths that bypasses the pneumatic gauge and pressure control device D′ and connects the compressed air outlet of the air compressor PS2directly to the pneumatic system V, such as to the one or more air springs VS, without flowing through the pneumatic gauge and pressure control device D′. In such case, the pneumatic gauge and pressure control device D′ can be modified to eliminate the air inlet fitting50aand air inlet passage50. Also in such case in which the air supply line SL is replaced by the air supply line SL′, when the pneumatic gauge and pressure control device D′ is manipulated to be in the second (fill) state, the one or more switches SW operably connect the electrical power E to the air compressor PS2such that the air compressor PS2operates to supply compressed air to the pneumatic system V through the supply line/passage SL′ such as the illustrated system V including one or more air springs VS. In the first (neutral) and third (vent) operative positions of the pneumatic gauge and pressure control device D′, the one or more switches SW disconnect the air compressor PS2from the operative electrical power E or otherwise deenergize and/or deactivate the air compressor PS2.

FIG.10shows another alternative pneumatic system PS″ that is identical to the system PS except as otherwise shown and/or described herein. In the pneumatic system PS″, the destination pneumatic device or system V such as the one or more air springs VS is fluidically connected to an electrically controlled pneumatic flow control valve SV such as a solenoid valve or other control valve. The control valve SV is also operably connected by a supply line SL to a source of compressed air such as the air tank PS1fed by the compressor PS2or the tank PS1can be eliminated and the control valve SV connected directly to the compressor PS2by the supply line SL as shown by the broken line SL′. The control valve SV can be normally spring biased to a first or neutral position in which the control valve SV blocks flow of compressed air into or out of the air springs VS or other system V. The pneumatic gauge and pressure control device D ofFIGS.5A-5Bhas been replaced by a pneumatic gauge and pressure control device D″ that is identical to the device D except as otherwise shown and/or described herein. The pneumatic gauge and pressure control device D″ can omit the air inlet passage50, vent passage60, airflow stop70, distribution passage40, and distribution orifice12x. The pressure gauge inlet fitting14iis fluidically connected to the destination system V as indicated by the broken line14L such that the pressure gauge14can directly sense and output or provide an indication of the air pressure in the air spring(s) VS or other destination system V. The pneumatic gauge and pressure control device D″ is operably connected to a source of electrical power E which can be DC or AC power and comprises one or more mechanical or solid state (semiconductor) switches SW1, SW2that selectively control operative connection of the electrical power E to the control valve SV. When the device pneumatic gauge and pressure control device D″ is in its first (neutral) position, the control valve SV can be deenergized and spring-biased to its first or neutral position in which the control valve SV blocks flow of compressed air into or out of the air spring(s) VS or other destination system V. When the pneumatic gauge and pressure control device D″ is in its second (fill) state, the one or more switches SW1, SW2operably connect the electrical power E to the control valve SV to cause the control valve to move into a second (fill) state in which the control valve SV shifts to place the air tank PS1in fluid communication with the air spring(s) VS and/or other components of the destination system V so that compressed air is supplied to the destination system V from the tank PS1via supply path SL. If the air tank PS1is omitted, when the pneumatic gauge and pressure control device D″ is in its second (fill) state, the one or more switches SW1, SW2operably connect the electrical power E to the control valve SV and also to the compressor PS2(via electrical connection AC shown with a broken lines) to both operably energize the compressor PS2and also cause the control valve SV to shift into a second (fill) state in which the control valve SV places the compressed air outlet of the operative air compressor PS2into fluid communication with the air spring(s) VS and/or other components of the destination system V via supply line/path SL′ so that compressed air is supplied to the destination system V from the compressor PS2. When the pneumatic gauge and pressure control device D″ is in its third (vent) state, the one or more switches SW1, SW2operably connect the electrical power E to the control valve SV to cause the control valve SV to shift into a third (vent) state in which the control valve SV places the destination system V in fluid communication with a vent VT (which can be a vent orifice of the valve SV or other air outlet or vent location) so that compressed air is vented from the air spring(s) VS and/or other components of the destination system V to a surrounding atmosphere or other location. In such third (vent) state, the control valve SV blocks communication of compressed air into the system V from the air tank PS1via path SL or from air compressor PS2via path SL′. Also, in such third (vent) state, the one or more switches SW1, SW2of the pneumatic gauge and pressure control device D″ can deenergize the air compressor PS2.

In a further alternative embodiment, the supply line SL, SL′ is replaced by a supply line SL2as shown in broken lines inFIG.10that connects the compressed air outlet of the air compressor PS2directly into fluid communication with the pneumatic system V such as the one or more air springs VS without passing through the control valve SV. In such embodiment, when the pneumatic gauge and pressure control device D″ is in its second (fill) state, the one or more switches SW1, SW2operably connect the electrical power E to or otherwise activate the air compressor PS2(as shown by the broken line AC) to cause compressed air to be supplied from the air compressor PS2to the air spring(s) VS and/or other components of the destination system V without passing through the control valve SV, in which case the control valve SV is used only for venting as described above.

FIGS.11A and11Brespectively show additional alternative embodiments in which the embodiments ofFIG.10are modified to use the pneumatic gauge and pressure control device D′ ofFIGS.9A—9C such that venting of compressed air from the air springs VS or other system V is accomplished through the pneumatic gauge and pressure control device D′ as described in relation toFIGS.9A-9C. In particular,FIG.11Acorresponds to the embodiment ofFIG.10in which the compressed air outlet of the air tank PS1is connected to the control valve SV by way of supply line SL. The air springs V or other components of the pneumatic system2PS″ are fluidically connected to the air system fitting G of the pneumatic gauge and pressure control device D′. In this embodiment, the air inlet fitting50aand inlet passage50can be eliminated. The pneumatic gauge and pressure control device D′ is identical to the device D except that it is operably connected to a source of electrical power E which can be DC or AC power and comprises one or more mechanical or solid state (semiconductor) switches SW (i.e., a single switch SW or more than one switch SW) that selectively control operative connection of electrical power to the control valve SV. More particularly, when the pneumatic gauge and pressure control device D′ is in its second (fill) state, the one or more switches SW operably connect the electrical power E to the control valve SV such that the control valve SV opens to allow flow of compressed air from the air tank PS1to the air springs VS or other system V. In the first (neutral) and third (vent) operative positions of the pneumatic gauge and pressure control device D′, the one or more switches SW operate to disconnect the control valve SV from the operative electrical power E or to otherwise control the control valve SV such that the control valve SV closes and blocks flow of compressed air from the air tank PS1to the pneumatic system V. In one example, the control valve SV comprises a solenoid valve that is spring-biased to a normally closed state that blocks air flow. When the electrical power E is connected to the control valve SV, the valve SV opens against the biasing force of the spring to allow air flow. When the electronic power is disconnected from the control valve SV, the control valve SV automatically closes under the biasing force of the spring to block air flow. In the third (vent) operative position (as shown inFIG.11A), the distribution passage40is fluidically connected to the vent passage60to vent compressed air from the system V, i.e., compressed air flows from the system V into the system fitting G, into the main passage30, into the distribution/branch passage40and is vented through the vent passage/orifice60. As described above, in relation toFIGS.9A-9C, when the pneumatic gauge and pressure control device D′ is in its first (neutral) position, the distribution passage or branch passage40is blocked by the blind bore or other air stop70to capture compressed air in the system V.

The embodiment shown inFIG.11Bis identical to the embodiment ofFIG.11Abut eliminates the air tank PS1. In such case, when the pneumatic gauge and pressure control device D′ is in its second (fill) state, the one or more switches SW operably connect the electrical power E to the control valve SV and also to the compressor PS2(via electrical connection AC) to both operably energize the compressor PS2and also cause the control valve SV to shift into a second (fill) state in which the control valve SV opens and places the compressed air outlet of the operative air compressor PS2into fluid communication with the air spring(s) VS and/or other components of the destination system V via supply line/path SL′ so that compressed air is supplied to the destination system V from the compressor PS2.

In another alternative embodiment, instead of rotating the second/inner body12in a first direction Z1to obtain the second (fill) position and rotating the second/inner body12in an opposite second direction Z2to obtain the third (vent) position, the second/inner body12can be rotated in only the first direction Z1(or only in the second direction Z2) to obtain and be positioned in both the second (fill) position and the third (vent) position, wherein one of these positions is obtained first by rotating the second/inner body12a first angular distance in the first or second direction Z1, Z2and the other of these positions is obtained by rotating the second/inner body12further in the same direction Z1, Z2a second angular distance (greater than the first angular distance). In such case, the spring S biases the second/inner body12toward and into its first (neutral position) and allows manual rotation of the second/inner body12in one direction toward and into each of the second (fill) and third (vent) positions depending upon the magnitude of rotation.

Although the pneumatic gauge and pressure control device D, D′, D″ is described primarily as being structured such that the second body12rotates relative to the first body10to and between the first (neutral), second (fill), and third (vent) positions, in an alternative embodiment, the first body10can rotate relative to the second body12to obtain the first (neutral), second (fill), and third (vent) positions, or both the first body10and second body12can be rotated relative to each other to obtain the first (neutral), second (fill), and third (vent) positions. As such, it is the selective, relative rotational positions of the first and second bodies10,12, that places the device D, D′, D″ in its first (neutral), second (fill), and third (vent) states or positions. In another alternative embodiment, the pneumatic gauge14and the second body12slide axially along the axis X relative to the first body10and/or the first body10slides axially along the axis X relative to the second body12to configure or place the device D, D′, D″ in the first, second, and third operative states or positions. For example, in one embodiment, a user manually depressed the pneumatic gauge14inwardly along the axis X toward the inner end wall10eof the first body10to place the device D, D′, D″ in its fill state to add compressed air to the system (as indicated by broken line arrow Z1′ inFIG.1) and the user manually extends or pulls the pneumatic gauge14away from the inner end wall10eof the first body10to place the device D, D′, D″ in its vent state to vent compressed air from the system V (as indicated by broken line arrow Z1′ inFIG.1).

Any compressed air supply line, path, passage, conduit, or connection described ‘herein can be provided by one or more hoses, passages, orifices, conduits, fittings, valves, manifolds, and other compressed air supply or flow control components that communicate compressed air from a source or region of higher pressure to a destination or region of lower pressure.

FIG.12partially illustrates a pneumatic gauge and pressure control device D′, D″ wherein the first body10further comprises one or more optional electrical terminals TX projecting outwardly through the end wall10eand adapted to be connected to electrical wires. The terminals TX are electrically operably connected to the one or more electrical switches located inside the main bore10dof the first housing10.

FIGS.13-17illustrate another alternative embodiment of a pneumatic gauge and pressure control device D2which is identical to the pneumatic gauge and pressure control device D and D′ except as otherwise shown and/or described herein. InFIGS.13-17, the pneumatic gauge and pressure control device D2is shown with the optional electrical terminals TX that can be included when the pneumatic gauge and pressure control device D2is provided with one or more electrical switches SW as described in relation to the pneumatic gauge and pressure control device D′ and that can be omitted when the pneumatic gauge and pressure control device D2does not include any electrical switched SW such as when the pneumatic gauge and pressure control device D2is arranged as described in relation to the pneumatic gauge and pressure control device D. Like components relative to the devices D, D′ are identified with like reference numbers/letters and are not necessarily described again, while similar corresponding components are identified with reference numbers that are 100 greater than those used to describe the devices D, D′ and any differences relative to the devices D, D′ are shown and/or described as required to understand the alternative embodiment D2of the device.

The first (outer) body110of device D2includes external helical threads110t. The bezel120is connected to the first body110by being threadably engaged with the external threads110t. The external threads110twhich can be continuous or include separate spaced-apart sections, are also adapted to threadably receive a corresponding mounting nut110nthat is used to connect the device D2to an associated panel P (FIG.13) or other mounting structure by inserting the first body110through and aperture defined in the panel P and advancing the mounting nut110non the external threads110tto capture the panel P between the bezel120and the mounting nut110n. The nut110ncan include flats or be scalloped (as shown) or otherwise include a non-circular peripheral edge110n1to facilitate manual rotation of the nut110non the threads110tby a user.

Referring toFIG.13and also the exploded views ofFIGS.14A &14B, the pneumatic pressure gauge114is shown as comprising an optional gauge bezel or gauge rim114bthat is non-rotatably connected to the gauge114to provide a suitable convenient structure for being grasped by a user to rotate the pressure gauge114about the axis of rotation X. As shown, the gauge bezel/rim114bincludes a circular peripheral edge, but this edge can include flats, be scalloped or otherwise be textured and/or formed with a non-circular shape to facilitate a user's manual rotation of the gauge bezel/rim114band the gauge114about the axis of rotation X. The gauge bezel/rim114bcan be non-rotatably secured to the gauge14by a friction fit, an adhesive, a mechanical interlocked structure, and/or otherwise. As shown inFIG.14B, the gauge inlet fitting114iincludes a hexagonal or other non-circular portion that non-rotatably closely mates with a correspondingly formed and dimensioned aperture114b1defined in the gauge bezel/rim114b.

As described above in relation to the pressure gauge14and gauge plate16, the pressure gauge114is similarly non-rotatably connected to the gauge plate116such that during normal operative use of the device D2, manual rotation of the pressure gauge114in clockwise or counter-clockwise directions about the axis of rotation X causes corresponding 1:1 rotation of the gauge plate116(and also second body112) about the axis of rotation X without any relative rotational movement between the fitting114iand threaded aperture116aof the gauge plate116as would lead to loosening or disconnection of the pressure gauge114from the threaded aperture116aof the gauge plate116, although the pressure gauge114can be intentionally unthreaded from the aperture116aof the gauge plate for repair and/or replacement by restraining the gauge plate116and second body112and using force beyond normal operative force to unthread the pressure gauge114from the gauge plate116. The gauge plate116is similar to the gauge plate16described above except that it further comprises an output portion116ssuch as a tab or stud that projects from its inner face116faway from the pressure gauge114(toward the inner end wall110eof the first (outer) body110) at a location that is radially offset with respect to the axis of rotation X such that rotation of the pressure gauge114and gauge plate116about the axis of rotation X causes movement of the output stud or other output portion116son a circular arc about the axis of rotation so that the stud or other output portion can be used to rotate the second body112about the axis of rotation X as described below. The stud or other output portion116scan include a slot or bore116sb.

The pneumatic gauge and pressure control device D2further includes a main fitting130fthat differs from the main fitting30fdescribed above in that the main fitting130fcomprises a body130fbthat can be a one-piece molded polymeric body. The main fitting body130fbcomprises a main airflow position including the main airflow passage130(corresponding to the main airflow passage30of the main fitting30f) that extends between the first and second connection ports130a,130b. The main fitting body130fbfurther comprises a branch portion140bincluding the branch/distribution passage140(corresponding to the branch/distribution passage40) that is fluidically mated with the distribution orifice112xof the second (inner) body (corresponding to the distribution orifice12xof the second (inner) body12). The main fitting130fis shown separately in the section view ofFIG.18where it can be seen that the distribution passage140can include an open end140ethat facilitate injection molding or other manufacturing of the main fitting body130fb, and this open end140ecan be sealed by any suitable plug structure such as a plug fitting140f.

The second (inner) body112differs from the second (inner) body12of the device D in that the second body112omits the annular wall12a(i.e., omit the wall segments12b1,12b2) of the second (inner) body12such that the second body112comprises the main wall12gin the form of a disc-shaped body or structure. The second body112operatively and non-rotatably coupled to the gauge plate116such that the second body and gauge plate rotate together about the axis of rotation X as a unit when the gauge plate116rotates in response to user manual rotation of the pressure gauge14in either a clockwise or counter-clockwise direction. The second body112can be operably and non-rotatably connected to the gauge plate through any suitable connection or they can even be formed as a one-piece structure or be assembled to form a unit. In the illustrated embodiment, the second body112is operatively and non-rotatably coupled to the gauge plate116by and through the main fitting130fwhich is, itself, operatively and non-rotatably coupled to both: (i) the second body112on an inner side of the main fitting130f; and (ii) the gauge plate116on an opposite outer side of the main fitting130f. More particularly, with reference toFIGS.15-18, the first connection port130aof the main fitting130fis operatively physically engaged with the gauge plate116in fluid communication with the gauge inlet passage116p(e.g., received within or otherwise physically mated with the gauge inlet passage116p), and the opposite, second connection port130bis operatively physically engaged with the second body112in fluid communication with the secondary air outlet passage112p(e.g., received within or otherwise physically mated with the secondary air outlet passage112p) such that the main airflow passage130of the main fitting130fextends between and fluidically interconnects the secondary air outlet passage112p(and also the primary air outlet passage110p) with the gauge inlet passage116p. The main airflow passage130is arranged coaxially with the axis of rotation X. O-ring or other seals R5(FIGS.14A,14B) can be provided to seal the connections between the first and second connection ports130a,130band the gauge plate116and second body112, respectively. Also, an outer end140xof the branch portion140bis operably physically engaged with or operatively connected to the second body112at a location that is radially offset with respect to the axis of rotation X and in fluid communication with the distribution orifice112xof the second body (corresponding to the distribution orifice12xof the second (inner) body12). In the illustrated example, the outer end140xof the branch distribution portion140bis received within an enlarged portion such as a counterbore112x′ of the distribution orifice112xbut other arrangements are contemplated such as the outer end140xbeing mated with a fitting that is connected to the distribution orifice112xand/or by a portion of the second body112being received within or otherwise connected with the outer end140xof the branch distribution portion140b.

The outer end140xof the branch distribution portion140bis radially offset relative to the axis of rotation X such that rotation of the main fitting130fabout the axis of rotation X causes the outer end140xto move on a circular arc about the axis of rotation, and such movement of the outer end140xinduces rotation of the second (inner) body112about the axis of rotation X due to the engagement of the branch distribution passage outer end140xwith the second (inner) body112. This rotation of the main fitting130fabout the axis of rotation X results from a user's manual movement of the pressure gauge114about the axis of rotation in either a clockwise or counter-clockwise direction against the biasing force of the spring S. As described above, the spring S resiliently returns the second body112to its first or neutral position to provide the first or neutral operative state of the device D2when manual force on the pressure gauge114is released. More particularly, the main fitting130fcan comprise a torque input portion or stud130sthat is radially offset with respect to the axis of rotation X and that is operatively physically engaged with or operatively connected to the gauge plate116such as, for example, to the output stud116sof the gauge plate116such as by being received within the bore116sbof the output stud116sor vice versa with the output stud116sof the gauge plate received in a bore or slot of the input stud130sof the main fitting130for otherwise operatively connected to the gauge plate116such that movement of the gauge plate output stud116son an arc about the axis of rotation X induces corresponding movement of the input stud130sand the entire main fitting130fon an arc about the axis of rotation X in the same direction which, in turn, induces movement of the second (inner) body112about the axis of rotation X due to the operative connection of the outer end140xof the branch distribution passage140with the second (inner) body112. As such, a user can manually rotate the pressure gauge114about the axis of rotation X to cause rotation of the second body112about the axis of rotation X to move the second body112from the first (neutral) position which defines the first or neutral operative state of the device D2(FIG.15) to either: (i) the second (fill) operative position to place the device D2in its second or fill operative state (FIG.16); or (ii) the third (vent) operative position to place the device D2in its third or vent operative state (FIG.17). In its free state, such as when the user releases the pressure gauge14, the spring S resiliently returns the second body112to the first or neutral position to automatically return the device D2to its default or normal condition of being in the first or neutral operative state in which airflow into or out of the main airflow passage130and the associated pneumatic system V is blocked.

The present pneumatic gauge and pressure control device D, D′, D″, D2enables a method for adding or removing compressed air from a tire, air spring or any other pneumatic device or system V by manually rotating or otherwise moving the pneumatic gauge14,114itself rather than by manipulating a switch or valve or other component that is separate from the pneumatic gauge14,114. The present method can include manually moving a pneumatic gauge from a neutral position to a fill position where compressed air is communicated from an associated source into an associated device or system such as a tire or air spring. The method can further include manually moving the pneumatic gauge from the neutral position or from the fill position to a vent position where compressed air is vented from the tire, air spring, or other associated device or system. The method can include manually rotating the pneumatic gauge about an axis of rotation to the fill and/or vent positions. In one embodiment, the method includes rotating the pneumatic gauge from the neutral position in a first direction to the fill position and from the neutral position in a second direction to the vent position. The method can include providing electrical output based upon the position of the pneumatic gauge and/or can include selectively connecting the tire, air spring, or other pneumatic system to an air inlet passage and/or a vent depending upon the operative position to the pneumatic gauge.

While the subject matter of the present disclosure has been described with reference to the foregoing embodiments and considerable emphasis has been placed herein on the structures and structural interrelationships between the component parts of the embodiments disclosed, it will be appreciated that other embodiments can be made and that many changes can be made in the embodiments illustrated and described without departing from the principles hereof. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. Accordingly, it is to be understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the subject matter of the present disclosure and not as a limitation. As such, it is intended that the subject matter of the present disclosure be construed as including all such modifications and alterations.