This disclosure generally relates to liquid dispensing devices and, more particularly, to liquid dispensing devices for dispensing viscous liquids, such as hot melt adhesives.
A typical dispensing device for supplying a liquid, such as a hot melt adhesive, generally includes a body including a needle having a valve element that blocks and unblocks a fluid outlet. The needle is actuated by an actuator in a first cavity of the body. In pressure-type dispensers, when the fluid outlet is unblocked, the pressured liquid is dispensed as a continuous stream of liquid. In jetting-type dispensers, the striking of the needle against the fluid outlet causes discrete amounts of pressurized liquid to be dispensed.
Dispensing devices further include a fluid channel that directs liquid from a fluid inlet to a fluid outlet. The fluid channel can be located within a second cavity of the body of the dispensing device. The first and second cavities can be connected by a passageway that allows the needle to extend from the first cavity into the second cavity. Because the first and second cavities are open to each other via the passageway, a seal is typically placed within the body of the dispensing device to prevent fluid flow from the second cavity into the first cavity. Inadequate sealing will allow fluid to flow into the first cavity and come into contact with the actuator, which can severely inhibit or disable the actuator.
The operation of dispensing devices with hot melt adhesives can be challenging due to the way certain hot melt adhesives cure. Examples of catalysts to the curing of hot melt adhesives are moisture and heat. Once certain hot melt adhesives are cured, such as polyurethane (PUR) adhesive, they cannot be melted again, as the internal structure of the adhesive has changed. Also, some adhesives can be very difficult to clean using solvents.
During operation of the dispensing device, hot melt adhesive can build up within the fluid flow path and impede the flow of additional liquid. As a result, the dispensing device must be periodically disassembled and a flush material must be passed through the flow path to remove any material remaining within the flow path. The flush material is preferably a compatible material having a similar viscosity as the hot melt adhesive. The amount of material build-up within the flow path is partially determined by the geometric complexity of the flow path, including the presence of any recesses, angled surfaces, threading, etc. Any increase in the amount of material build-up within the flow path increases both the time required to clean the dispensing device and the difficulty of completely flushing liquid from the dispensing device.
Further, a complex flow path can result in flush material remaining within the flow path after cleaning has been completed. Any flush material that remains in the fluid flow path following flushing can compromise the purity of any liquid that subsequently passes through the dispensing device. Decreasing the complexity of the fluid channel and the potential for material build-up within the fluid channel can limit the amount of time a dispensing device is out of operation for cleaning, as well as increase the efficiency and completeness with which flushing takes place, and increase the accuracy with which a user can verify that all flush material has been removed from the fluid channel.
Therefore, there is a need for an improved dispensing device that can be cleaned and/or replaced more easily and effectively.
An embodiment of the present disclosure includes a dispensing module for dispensing a liquid. The dispensing module includes an actuator housing defining an actuator cavity, a body cavity, and a needle passageway connecting the actuator cavity and the body cavity. The dispensing module further includes an actuator disposed within the actuator cavity, and a needle defining an upper end and a lower end opposite the upper end in a longitudinal direction. The lower end of the needle defines a valve element, and the upper end of the needle is secured to the actuator such that the needle extends from the actuator cavity through the needle passageway. Further, the dispensing module includes a nozzle adapter releasably coupled to the actuator housing, the nozzle adapter defining a seal seat, a fluid inlet, a fluid channel partially defined by a valve seat, and a fluid outlet in fluid communication with the fluid inlet and the fluid channel. The fluid channel extends from the seal seat to the fluid outlet. The nozzle adapter is configured to be at least partially disposed within the body cavity when coupled to the actuator housing, such that the lower end of the needle extends into the fluid channel. Additionally, the dispensing module includes at least one seal configured to be received within the seal seat, where the at least one seal is configured to prevent flow of the liquid from the fluid channel of the nozzle adapter into the needle passageway of the actuator housing.
Another embodiment of the dispensing module includes an actuator housing defining a top surface and a bottom surface opposite the top surface in a longitudinal direction, where the bottom surface defines a first aperture configured to receive a fastener. The actuator housing further defines an actuator cavity, a body cavity, and a needle passageway connecting the actuator cavity and the body cavity. The dispensing module further includes an actuator disposed within the actuator cavity, and a needle defining an upper end and a lower end opposite the upper end in the longitudinal direction. The lower end of the needle defines a valve element, and the upper end of the needle is secured to the actuator such that the needle extends from the actuator cavity through the needle passageway. The dispensing module further includes a nozzle adapter defining a nozzle body that includes an upper surface, a lower surface opposite the upper surface in the longitudinal direction, and a protrusion extending from the nozzle body in a lateral direction that is perpendicular to the longitudinal direction at a location between the upper surface and the lower surface along the longitudinal direction. The protrusion defines a second aperture configured to receive the fastener. The nozzle adapter further defines a seal seat, a fluid inlet, a fluid outlet, and a fluid channel extending from the seal seat to the fluid outlet, wherein the fluid channel is in fluid communication with the fluid inlet and the fluid outlet. The fluid channel is partially defined by a valve seat. The nozzle adapter is configured to be at least partially disposed within the nozzle body cavity when coupled to the actuator housing, such that the lower end of the needle extends into the fluid channel, and the fastener extends through the first aperture and the second aperture, such that the fastener releasably secures the nozzle adapter to the actuator housing.
The foregoing summary, as well as the following detailed description, will be better understood when read in conjunction with the appended drawings. The drawings show illustrative embodiments of the disclosure. It should be understood, however, that the application is not limited to the precise arrangements and instrumentalities shown.
Described herein is a dispensing module 10 that includes an actuator housing 20 and a nozzle adapter 50, where the nozzle adapter 50 is releasably coupled to the actuator housing 20. The nozzle adapter 50 may be releasably coupled to the actuator housing 20 using fasteners 55, such that when the fasteners 55 are removed from the dispensing module 10, the nozzle adapter 50 can be separated from the actuator housing 20. Also, the nozzle adapter 50 may define a fluid channel 250 that defines a simple flow path and does not contain any seals therein, and as such is easily cleaned.
Certain terminology is used to describe the dispensing module 10 in the following description for convenience only and is not limiting. The words “right”, “left”, “lower” and “upper” designate directions in the drawings to which reference is made. The words “inner” and “outer” refer to directions toward and away from, respectively, the geometric center of the description to describe dispensing module 10 and related parts thereof. The terminology includes the above-listed words, derivatives thereof and words of similar import.
The dispensing module 10 is described herein as extending vertically along a longitudinal direction 14, and horizontally along a lateral direction 15 and a transverse direction 16. Unless otherwise specified herein, the terms “longitudinal,” “transverse,” and “lateral” are used to describe the orthogonal directional components of various components of dispensing module 10. It should be appreciated that while the transverse and lateral directions are illustrated as extending along a horizontal plane, and that the longitudinal direction is illustrated as extending along a vertical plane, the planes that encompass the various directions may differ during use.
Referring to
Referring next to
The lower portion 103b of actuator cavity 103 may define a pressurized air chamber 104, as illustrated in
The housing cap 23 may contact the actuator housing top surface 21a, and may define a portion of actuator cavity 103, particularly the upper portion 103a. As noted previously, the housing cap 23 may be coupled to the actuator housing 20 via fasteners 27. A seal 105, such as an O-ring, may be disposed between the housing cap 23 and the actuator housing 20 in order to prevent pressurized air from escaping the upper portion 103a of the actuator cavity 103. Fasteners 27, which may be threaded screws, for example, extend through the housing cap 23 and apertures 106 defined by the actuator housing 20, such that the housing cap 23 is releasably coupled to the actuator housing 20. The actuator 109 may further include a spring 110 in the upper portion 103a of the actuator cavity 103 that urges the needle 40 downwards to a neutral position. The spring 110 may be disposed between the piston assembly 114 and the housing cap 23, such that the spring 110 contacts both the piston assembly 114 and the housing cap 23. The spring 110 may be a compression spring. Thus, when the lower portion 103b of the actuator cavity 103 is depressurized, the spring may apply a downward force to the piston assembly 114 that causes the needle 40 to travel downwards. However, the spring 110 may be any other type of spring as desired. The housing cap 23 may be adjustable in relation to the actuator housing 20, such that the amount of biasing force that is provided by the spring 110 may be adjusted. Other configurations of the actuator 109 are possible, such as a double acting piston with pressurized air chambers on both sides of the piston assembly 114. For example, an actuator 109 configured as a double acting piston could include a pressurized air chamber in the upper portion 103a of the actuator cavity 103, as well as a pressurized air chamber 104 in the lower portion 103b of the actuator cavity 103. In this configuration, a second air inlet 144, which is defined by the actuator housing 20, can be utilized to provide pressurized air to the upper portion 103a of the actuator cavity 103. Dispensing module 10 may include a second air inlet seal 145 disposed along the first lateral outer surface 71a at the opening of second air inlet 144 to prevent pressurized air from leaking out of the upper portion 103a of the actuator cavity 103. In another embodiment, the actuator 109 may include electrical actuators that are configured to selectively move the needle 40.
Turning now to
Turning to
Referring to
The nozzle adapter 50 may be configured such that when the body cavity 104 receives at least a portion of the nozzle adapter 50, the upper surface 52a of the nozzle adapter 50 contacts the body cavity top surface 180. Also, the first lateral outer sidewall surface 53a of the nozzle adapter 50 may face the first lateral inner surface 182a of the actuator housing 20, and the second lateral outer sidewall surface 53b of the nozzle adapter 50 may face the second lateral inner surface 182b of the actuator housing 20. Further, the first transverse outer sidewall surface 53c of the nozzle adapter 50 may face the first transverse inner surface 183a of the actuator housing 20, and the second transverse outer sidewall surface 53d of the nozzle adapter 50 may face the second transverse inner surface 183b of the actuator housing 20. The dispensing module 10 may also be configured such that the protrusion top surface 241a contacts the actuator housing bottom surface 21b. The actuator housing 20 may define apertures 155 that extend into the body 22 of the actuator housing 20 from the actuator housing bottom surface 21b. The apertures 155 may extend substantially along the longitudinal direction 14, or may extend along any other direction as desired. When a portion of the nozzle adapter 50 is received within the body cavity 104, the apertures 155 of the actuator housing 20 are configured to align with the apertures 235 defined by the protrusion 240 of the nozzle adapter 50. As a result, the apertures 155 and the apertures 235 are configured to receive the fasteners 55. As noted above, the fasteners 55 may be configured to releasably secure the nozzle adapter 50 to the actuator housing 20. In one embodiment, the fasteners 55 may be configured as threaded screws 60. Any number of fasteners 55 can be used as needed. For example, the dispensing module 10 can include one, two, three, or more fasteners 55 as needed. For each fastener 55 that is included in the dispensing module 10, the actuator housing 20 will have a corresponding number of apertures 155, and the protrusion 240 will have a corresponding number of apertures 235.
The threaded screws 60 may each have a head 61 that can be shaped so as to engage a fastening tool (not shown) in order to insert the threaded screws 60 into the apertures 155 and 235. For example, each head 61 may define a hex shape. Alternatively, each head 61 of the threaded screws 60 may define a socket 63 extending into the head 61. Each socket 63 may be configured to receive a fastening tool (not shown) in order to insert the threaded screws 60 into the apertures 155 and 235. The threaded screws 60 may each also include a threaded shaft 62 extending from the head 61. Likewise, apertures 155 and 235 may be at least partially threaded so as to engage the threaded shaft 62 of each of the threaded screws 60. In addition to the threaded screws 60, the fasteners 55 can be any other type of fastener as desired.
Referring now to
Referring to
Referring again to
The nozzle adapter 50 further defines a fluid channel 250 that extends through the nozzle adapter 50 from the seal seat 260 to the fluid outlet 210. The fluid channel 250 is partially defined by a sidewall 251, and may also be partially defined by a valve seat 255. The sidewall 251 may extend longitudinally from the seal seat 260 to the valve seat 255. In one embodiment, the valve seat 255 is configured as a tapered surface that extends from the sidewall 251 to the fluid outlet 210. However, the valve seat 255 can be configured as a surface with any geometric shape as desired. The fluid channel 250 defines a maximum diameter d2 that extends from one side of the sidewall 251 to the other along a direction that is substantially perpendicular to the longitudinal direction 14. The maximum diameter d2 may be located anywhere along the fluid channel 250 along the longitudinal direction 14. In one embodiment, the sidewall 251 of the fluid channel 250 is substantially straight, and extends substantially perpendicular to the longitudinal direction 14, such that the portion of the fluid channel 250 defined by the sidewall 251 defines a substantially constant diameter d2. However, the sidewall 251 of the fluid channel 250 could take on other embodiments as desired. For example, the sidewall 251 of the fluid channel 250 could be curved, tapered, etc. along the longitudinal direction 14. The fluid channel 250 may define a substantially uniform cross section along the longitudinal direction 14. Alternatively, the cross section of the fluid channel 250 may not be uniform along the longitudinal direction 14. Additionally, the fluid outlet 210 defines a diameter d1 that extends from one side of the fluid outlet 210 to the other along a direction that is substantially perpendicular to the longitudinal direction. The fluid channel 250 may be configured such that the maximum diameter d2 of the fluid channel 250 is greater than the diameter d1 of the fluid outlet 210, but is less than the diameter d3 of the seal 225. Likewise, the diameter d1 of the fluid outlet 210 may be less than the diameter d3 of the seal 225. The fluid channel 250 may also define a relatively small volume. In one embodiment, the volume of the fluid channel 250 is about 0.1 cubic inches. However, the volume of the fluid channel 250 can be any volume as desired as long as the volume is minimalized to maximize fluid velocity for best scavenging while not interfering with max flow requirements of the application.
When the seal 225 is disposed in the seal seat 260 of the nozzle adapter 50, the bottom surface 310 of the seal 225 may partially define the fluid channel 250. In this configuration, the seal 225 prevents fluid from flowing out of the fluid channel 250 and into the needle passageway 170 or the body cavity 104. Alternatively, the seal seat 260 can also receive more than one seal 225, for example two seals 225, for additional protection against fluid migration out of the fluid channel 250. In this configuration, the bottom surface 310 of the bottom seal 225 partially defines the fluid channel 250. The close proximity of the bottom surface 310 of the seal 225, which may be a bottom seal 225 when the seal seat 260 receives more than one seal 225, to the flow of fluid through the fluid channel 250 helps prevent semi-cured fluid from building up on and around the bottom surface 310 of the seal 225.
The fluid channel 250 is aligned with the needle passageway 315 of the seals 225 and the needle passageway 170 of the actuator housing 20, such that the needle 40 extends from an upper end 41 within the actuator cavity 103, through the needle passageway 170 of the actuator housing 20, through the needle passageway 315 of the seals 225, and into fluid channel 250 of the nozzle adapter 50. Needle 40 defines a lower end 42 disposed within the fluid channel 250 that is opposite the upper end 41 along the longitudinal direction 14, such that the needle 40 terminates at the lower end 42 within the fluid channel 250. The needle 40 defines a valve element 45 at the lower end 42, which is configured to interact with the valve seat 255, as will be described below in further detail. The valve element 45 could be any type of valve element as desired. In one embodiment, the valve element 45 is a ball valve element 46. Alternatively, the valve element 45 could be a needle valve element. The fluid channel 250 is configured such that it is completely spaced along the lateral direction 15 and/or the transverse direction 16 from each of the apertures 235 of the protrusion 240. The fluid channel 250 is also configured such that it is completely spaced along the lateral direction 15 and/or the transverse direction 16 from each of the apertures 155 of the actuator housing 20. As such, none of the apertures 155 and the apertures 235 is open to the fluid channel 250. Thus, when the fasteners 55 are inserted through the apertures 155 of the nozzle adapter 50 and the apertures 235 of the protrusion 240, they do not enter the fluid channel 250 or interfere with the flow of fluid through the fluid channel 250. In one embodiment, as shown in
With continued reference to
The nozzle adapter 50 defines a fluid inlet 245 that extends from the outer sidewall surface 53 of the nozzle adapter 50 to the sidewall 251 of the fluid channel 250. As shown in
In an embodiment, the first lateral inner surface 182a of the actuator housing 20 may define a groove 190 that extends into the body 22 of the actuator housing 20. The groove 190 may extend around an opening of the actuator fluid inlet 193. Additionally, the first lateral outer sidewall surface 53a of the nozzle adapter 50 may define a recess 265 that extends into the nozzle body 51 of the nozzle adapter 50. The recess 265 may extend around an opening of the fluid inlet 245. The groove 190 and recess 265 may be configured to receive a flexible nozzle inlet seal 220, such that when the dispensing module 10 is fully assembled, the flexible nozzle inlet seal 220 is disposed between the first lateral outer sidewall surface 53a of the nozzle adapter 50 and the first lateral inner surface 182a of the actuator housing 20. The flexible nozzle inlet seal 220 is configured to prevent fluid from leaking between the actuator housing 20 and the nozzle adapter 50 as the fluid flows from the actuator fluid inlet 193 to the fluid inlet 245. The flexible nozzle inlet seal 220 may be any type of seal, such as an O-ring, for example. Groove 190 and recess 265 are not limited to the first lateral outer sidewall surface 53a and the first lateral inner surface 182a, respectively. The groove 190 may be defined by any of the inner surfaces 182a, 182b, 183a, or 183b, and the recess 265 may be defined by any part of the outer sidewall surface 53. Generally, though, the groove 190 will be disposed around an opening of the actuator fluid inlet 193, and the recess 265 will extend around an opening of the fluid inlet 245. The groove 190 and recess 265 function to help prevent damage to the flexible nozzle inlet seal 220 when the nozzle adapter 50 and the flexible nozzle inlet seal 220 are inserted into the actuator cavity 103 during assembly of the dispensing module 10.
The actuator housing 20 may define a beveled edge 185 that extends from the actuator housing bottom surface 21b to the first lateral inner surface 182a. However, the beveled edge 185 may also extend around the opening to the body cavity 104, such that the beveled edge 185 also extends from the actuator housing bottom surface 21b to the first transverse inner surface 183a, from the actuator housing bottom surface 21b to the second transverse inner surface 183b, and/or from the actuator housing bottom surface 21b to the second lateral inner surface 182b. The sloped profile of the beveled edge 185 aids in assembly of the dispensing module 10. When the nozzle adapter 50 is inserted into the body cavity 104, the flexible nozzle inlet seal 220 must simultaneously be inserted into the body cavity 104 in order for the flexible nozzle inlet seal 220 to be seated in both the recess 265 of the nozzle adapter 50 and the groove 190 of the actuator housing 20. The beveled edge 185 allows for a gradual transition of the flexible nozzle inlet seal 220 into the body cavity 104 to increase ease of assembly of the dispensing module 10.
In operation, the dispensing module 10 receives fluid from an external source (now shown) through the actuator fluid inlet 193. The fluid then flows along the fluid flow path 252 through the actuator fluid inlet 193, through the fluid inlet 245, and into the fluid channel 250. Initially, the needle 40 is in a first position, such that the valve element 45 contacts the valve seat 255, preventing fluid from flowing out of the fluid outlet 210. When a user of the dispensing module 10 desires to dispense fluid from the dispensing module 10, the user actuates the actuator 109. In one embodiment, when the actuator 109 is actuated, pressurized air is pumped into the lower portion 103b of the actuator cavity 103 through the air inlet 149. The pressurized air in the lower portion 103b of the actuator cavity 103 exerts a force on the lower piston element 125, which moves the piston assembly 114 upwards. Because the upper end 41 of the needle 40 is coupled to the piston assembly 114, the needle 40 will also move upwards. As a result, the lower end 42 and valve element 45 of the needle 40 will move upwards into a second position and become spaced away from the valve seat 255, thus allowing fluid to flow through the fluid outlet 210. In one embodiment, a continuous flow of fluid flows through the fluid outlet 210 due to internal pressure created by the fluid disposed within the fluid channel 250. In another embodiment, a discrete amount of fluid is dispensed from the fluid outlet 210 due to pressure created from pressurized air.
During operation, when the user wants to stop fluid from flowing through the fluid outlet 210, the user must return the needle 40 to the first position, such that the valve element 45 of the needle 40 contacts the valve seat 255, blocking the fluid outlet 210. To do this, in one embodiment, the user ceases actuation of the actuator 109, which depressurizes the lower portion 103b of the actuator cavity 103. As a result, the spring 110, which is operatively coupled to the piston assembly 114, urges the piston assembly 114 and the needle 40 downwards until the needle 40 is in the first position. Alternatively, pressurized air is pumped into upper portion 103a of the actuator cavity 103 through the second air inlet 144. Once pressure in the upper portion 103a of the actuator cavity 103 becomes greater than the pressure in the lower portion 103b of the actuator cavity 103, the piston assembly 114 and the needle 40 are urged downwards until the needle 40 is in the first position. The needle 40 can be alternated between the first position and the second position as many times as needed during the operation of the dispensing module 10.
During the course of operating the dispensing module 10, a user may be forced to cease operation of the dispensing module 10 for several reasons. For instance, even though the fluid channel 250 is shaped so as to reduce fluid build-up during operation of the dispensing module 10, fluid flowing through the dispensing module 10 can still partially cure and build up within the fluid flow path 252. Over time, this semi-cured fluid build-up can affect the flow of fluid through the fluid flow path 252 and hinder the overall operation of the dispensing module 10. Because of this, the dispensing module 10 must be disassembled, and all elements of the fluid flow path 252 through which fluid flows (i.e., the actuator fluid inlet 193, fluid inlet 245, fluid channel 250, and fluid outlet 210) must be purged of semi-cured fluid build-up. Disassembly of the dispensing module 10 can be easily accomplished by first removing the fasteners 55 from the apertures 155 and 235 using a fastening tool (not shown). Then, the nozzle adapter 50 can slide out of the body cavity 104 of the actuator housing 20. When the actuator housing 20 and the nozzle adapter 50 are separated, the actuator fluid inlet 193, fluid inlet 245, fluid channel 250, and fluid outlet 210 can be flushed using a flush material. Preferably, the flush material is a compatible material having a similar viscosity to the fluid that has built up within the dispensing module 10, though any flush material can be used as desired. The fluid flow path 252 defined by dispensing module 10, as well as the relatively low volume of the fluid channel 250, allows for a comparatively simple and quick flushing process. The low volume of the fluid channel 250 also maximizes fluid velocity within the nozzle adapter 50, which assists in removing semi-cured fluid from the nozzle adapter 50 during operation of the dispensing module 10, without interfering with flow requirements of an application of the dispensing module 10. Additionally, the simple geometry of the fluid channel 250 allows for easy verification that all of the semi-cured fluid, as well as the flush material, has been flushed out of the dispensing module 10, such that any fluid that will subsequently pass through the dispensing module 10 does not become contaminated by any remaining fluid or flush material.
Another instance that can require a user to cease operation of the dispensing module is the leakage of fluid outside the fluid flow path 252. The dispensing module 10 may include several different seals that act as safeguards against the leakage of fluid out of the fluid flow path 252, as discussed above. For example, the dispensing module 10 may include the actuator inlet seal 215, which may engage with both the actuator housing 20 and an external source of fluid flow (not shown), such that fluid does not leak out of the actuator fluid inlet 193. The dispensing module 10 may also include the flexible nozzle inlet seal 220 disposed between the first lateral outer sidewall surface 53a of the nozzle adapter 50 and the first lateral inner surface 182a of the actuator housing 20, which is configured to prevent fluid from leaking between the actuator housing 20 and the nozzle adapter 50 as the fluid flows from the actuator fluid inlet 193 to the fluid inlet 245. The dispensing module 10 also includes at least one seal 225 disposed within the seal seat 260 of the nozzle adapter 50 that is configured to prevent fluid from flowing out of the fluid channel 250 and into the needle passageway 170 or the body cavity 104. In another embodiment, the dispensing module 10 can include two of seals 225 disposed within the seal seat 260. The dispensing module may also include the flexible seal 230 that is configured to be seated in the recess 265 of the nozzle adapter 50, such that the flexible seal 230 also contacts the body cavity top surface 180. The flexible seal 230 can be configured to prevent fluid from escaping the nozzle adapter 50 and leaking into the body cavity 104. As the dispensing module 10 continues to be used over time, any of the seals listed above (e.g., the actuator inlet seal 215, flexible nozzle inlet seal 220, seals 225, and flexible seal 230) may become worn and begin to leak, or ultimately completely fail. In such a circumstance, a user of the dispensing module 10 must cease operation of the dispensing module 10 and replace the failed seal or seals. The dispensing module 10 can be easily disassembled, as noted above. As all of the seals are located on the exterior of the nozzle adapter 50 or actuator housing 20, and particularly not within the fluid flow path 252, the seals can be easily and quickly replaced upon disassembly of the dispensing module 10. This limits the difficulty of replacing the seals, and keeps the time that the dispensing module 10 is inoperable to a minimum.
The present disclosure is described herein using a limited number of embodiments. These specific embodiments are not intended to limit the scope of the disclosure as otherwise described and claimed herein. Modification and variations from the described embodiments exist. More specifically, the examples included are given as a specific illustration of embodiments of the claimed disclosure. It should be understood that the invention is not limited to the specific details set forth in the examples, and that various changes, substitutions, and alterations can be made without departing form the spirit and scope of the invention as defined by the appended claims.
This application claims the benefit of U.S. Provisional Patent App. No. 62/465,657, filed Mar. 1, 2017, the disclosure of which is hereby incorporated by reference herein.
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Number | Date | Country | |
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62465657 | Mar 2017 | US |