Aakash Deora

Docket No.: 42989-00514

TITLE

PULSATING SPRAY CLEANING NOZZLE ASSEMBLY AND METHOD

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63/232,234 entitled “PULSATING SPRAY CLEANING NOZZLE ASSEMBLY AND METHOD” filed on August 21, 2021, U.S. Provisional Patent Application No. 63/220,729 entitled “PULSATING SPRAY CLEANING NOZZLE ASSEMBLY AND METHOD” filed on July 20, 2021 and to U.S. Provisional Patent Application No. 63/218608 entitled “PULSATING SPRAY CLEANING NOZZLE ASSEMBLY AND METHOD” filed on July 6, 2021. This application is also related to of U.S. Application No. 16/255,326 entitled “COLD WEATHER LOW FLOW MINIATURE SPRAY NOZZLE ASSEMBLY AND METHOD” filed on Januaiy 23, 2019 and U.S. Utility application Ser. No. 15/759,242 entitled LOW-FLOW MINIATURE FLUIDIC SPRAY NOZZLE ASSEMBLY AND METHOD,” filed on Mar. 12, 2018

[0002] This application is also related to the following commonly owned patent applications: PCT application number PCT/US16/57762 entitled “Micro-sized Structure and Construction Method for Fluidic Oscillator Wash Nozzle” (WIPO Publication WO 2017/070246), PCT application number PCT/US 15/45429, entitled “Compact Split-lip Shear Washer Nozzle”, (WIPO Publication WO 2016/025930), and U.S. application Ser. No. 15/303,329, entitled “Integrated automotive system, compact, low profile nozzle assembly, compact fluidic circuit and remote control method for cleaning wide-angle image sensor's exterior surface”, (US Published Application US2017/0036650), the entire disclosures of which are incorporated herein by reference in their entireties. FIELD OF THE INVENTION

[0003] The invention relates, in general, to fluid spraying nozzle assemblies and methods, and more particularly to micro-sized nozzle structure and method of construction for fluidic oscillator type spray assemblies and in particular, micro-sized nozzle structures to be used for cleaning external surfaces such as external camera lens surfaces on a vehicle.

BACKGROUND

[0004] Fluidic type washer nozzles are well known for high efficiency spray performance by providing substantial coverage at a high speed with low flow rate. However, the major limitation of fluidic nozzle is that the package size needs to be too large for some application. For example, the inlet feed to outlet exit needs to be at least 6 mm for most of fluidic circuits.

[0005] For some applications, package size is a big concern due to very limited available space. Jet spray (i.e., shear) nozzles were commonly used in such applications. Because of narrow spray pattern, jet spray nozzles need higher flow rate or longer duration time to sufficiently clean debris from a glass or external lens surface. Jet spray nozzles have a smaller package size than fluidic nozzles, but do not share the same level of high efficiency spray performance.

[0006] Some shear nozzles can be made to generate useful sprays for washing and can be made adjustable with a ball insert in nozzle housing, but size constraints have remained a problem. Automotive designers want very compact nozzle assemblies for automotive washer nozzles, but also want an even and effective spray distribution. Automotive OEMs also want a nozzle which is very economical and versatile. For example, exterior trim assemblies often combine many functions, such as the CHMSL light assemblies, which can include other features such as external cameras, but cleaning the lenses on those cameras becomes problematic, if the designer's vision for exterior trim is to be preserved. [0007] Shear nozzles are sometimes used for small package-size applications, and they perform well for geometries where a spray fan is aligned with the axis of the feed hole, but poorly for geometries where the spray fan is perpendicular to the axis of the inlet or feed hole. Other challenges include spray aim and tooling complications which become major constraints for proposed designs including shear nozzles, and so is washer spray performance when spraying cold, high viscosity fluids.

[0008] Cold weather spray performance is another difficult objective, but solving cold weather washing spray generation problems in a miniaturized nozzle assembly is an extremely desirable objective, especially for vehicle camera wash nozzle applications. Under cold temperature conditions, good spray coverage on the vehicle camera lens is very important to remove dirt, ice or salt stains from camera lens or similar sensor surfaces.

[0009] Thus, there is a need for a practical, economical, readily manufactured and very compact washer nozzle configuration and cleaning method capable of addressing the noted concerns.

SUMMARY

[0010] Disclosed herein include embodiments of a pulsed spray nozzle assembly and method. In one embodiment, the pulsed spray nozzle assembly comprises a nozzle housing having a base portion and a head portion and an inlet positioned at the base portion that is configured to receive a flow of fluid therein. A flow conditioning insert defining at least one fluid passage along an inlet axis is configured to be inserted inside the cavity of the housing to communicate fluid from the inlet of the housing to an interaction region downstream from the flow conditioning insert to an interaction region along the inlet axis within the housing. An outlet positioned at the head portion of the housing in communication with the interaction region, wherein the fluid is configured to be dispensed from the outlet having a pulsed spray pattern along an outlet axis that is generally perpendicular to the inlet axis. The flow of fluid may be configured to bend from its flow along the inlet axis to be dispersed from the outlet along the outlet axis wherein the flow of fluid bends about 90 degrees after exiting the flow conditioning insert to be dispersed through the outlet such that the bend of fluid occurs within the interaction region.

[0011] The cavity may include a step that extends from an inner surface of the cavity of the housing and is positioned between the flow conditioning insert extending along the insert axis and the interaction region such that the interaction region is defined within the head portion of the housing and the cavity is defined within the base portion of the housing, wherein the head portion has a smaller outer perimeter than the base portion. The step may extends from an inner surface of the cavity of the housing downstream of the insert and be configured to interfere with the flow of fluid and assist to create turbulent flow in the interaction region. The step may be an inwardly extending radial shoulder configured as a stop to prevent further translation of the flow conditioning insert within the cavity. The step may extend or protrude radially inwardly a first distance D1 as aligned with the outlet and may protrude radially inwardly a second distance D2 at a location opposite from the first distance wherein the first distance is greater than the second distance.

[0012] In one embodiment, the at least one fluid passage of the flow conditioning insert includes a geometry having a first aperture and a second aperture wherein the first aperture and second aperture are positioned within the flow conditioning insert and are spaced from one another by a splitter. The step may protrude inwardly from the inner surface of the cavity to extend past a portion of the first and second apertures and assist to create turbulent flow in the interaction region. The first and second apertures and the splitter may include a tapered inner surface wherein an inlet portion of the apertures may have a larger perimeter opening than an outlet portion of the apertures. The flow conditioning insert may include an insert cavity defined by a radial wall that extends about a perimeter of the flow conditioning insert. The insert cavity may include a height defined by a feed distance that extends from a bottom of the insert to the at least one flow passage wherein the feed distance is less than about 3mm and more particularly be about 2mm. [0013] In another embodiment, the at least one fluid passage of the flow conditioning insert includes a first aperture and a second aperture that are defined by channels along an outer perimeter of the flow conditioning insert and along an inner surface of the cavity of the housing. The flow conditioning insert may include a perimeter wall having a flat portion and a rounded portion opposite from the flat portion to allow for proper alignment with a complimentary shaped portions along an inner surface of the cavity of the housing. The first and second apertures may be positioned out of alignment with a step that extends inwardly from an inner surface of the cavity. [0014] In another embodiment, the at least one flow passage of the flow conditioning insert is defined by a channel that extends from an inlet portion to an outlet portion along the inlet axis, wherein the channel is defined by oppositely disposed first and second edges that extend from a rear inner surface of the flow conditioning insert a first dimension and an inner extending ledge placed within the channel. The inner extending ledge may be positioned within the channel between the first edge and the second edge and may extend from the rear inner surface of the flow condition insert a second dimension, wherein the first dimension is greater than the second dimension. A portion of the first and second edges may abut against a step extending from an inner surface of the cavity and the inner extending ledge is spaced from the step at a position opposite from the outlet. The flow conditioning insert and a step extending from the inner surface of the cavity is configured to interrupt a flow path of fluid within the housing in a general “S” shaped flow pattern configured to generate turbulent flow within the interaction region downstream of the flow conditioning insert. The inner extending ledge may include a slope feature placed within the channel. The oppositely disposed first and second edges may be spaced from an inner surface of the cavity forming a space between the flow conditioning insert and the inner cavity wall along the inlet axis.

[0015] In yet another embodiment, provided is a pulsed spray nozzle assembly, comprising a nozzle housing having a cavity with an inlet configured to receive a flow of fluid therein. A flow conditioning insert defining at least one fluid passage along an inlet axis that is configured to be inserted inside the cavity of the housing to communicate fluid from the inlet to an interaction region downstream from the flow conditioning insert to an interaction region along the inlet axis within the housing, wherein the at least one fluid passage of the flow conditioning insert includes a geometry having a first aperture and a second aperture wherein the first aperture and second aperture are positioned within the flow conditioning insert and are spaced from one another by a spliter. A step that extends from an inner surface of the cavity of the housing downstream of the insert that is configured to assist to create turbulent flow in the interaction region. An outlet positioned downstream the flow conditioning insert along the housing in communication with the interaction region, wherein the fluid is configured to be dispensed from the outlet having a pulsed spray patern along an outlet axis that is generally perpendicular to the inlet axis, wherein the flow of fluid is configured to bend from its flow along the inlet axis to be dispersed from the outlet along the outlet axis wherein the flow of fluid bends about 90 degrees after exiting the flow conditioning insert to be dispersed through the outlet such that the bend of fluid occurs within the interaction region.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosed assembly may be beter understood by reference to the following detailed description taken in connection with the following illustrations, wherein:

[0017] Figure 1 is a side perspective view of a housing of a pulsating spray cleaning nozzle assembly according to the instant application;

[0018] Figure 2 is a see through side perspective view of the housing of the pulsating spray cleaning nozzle assembly of Figure 1;

[0019] Figure 3A is a cross sectional view through a first side of the housing of the pulsating spray cleaning nozzle assembly of Figure 1; [0020] Figure 3B is a cross sectional view through the rear side of the housing of the pulsating spray cleaning nozzle assembly of Figure 1;

[0021] Figure 3C is a perspective cross sectional view through the first side of the housing of the pulsating spray cleaning nozzle assembly of Figure 1;

[0022] Figure 4A is a cross sectional view through a first side of the housing of another embodiment of the pulsating spray cleaning nozzle assembly of the instant disclosure;

[0023] Figure 4B is a perspective view of a flow conditioning insert of Figure 4A;

[0024] Figure 5A is a cross sectional view through a first side of the housing of another embodiment of the pulsating spray cleaning nozzle assembly of the instant disclosure;

[0025] Figure 5B is a perspective view of a flow conditioning insert of Figure 5 A;

[0026] Figure 6A is a see through perspective view of the housing of another embodiment of the pulsating spray cleaning nozzle assembly of the instant disclosure;

[0027] Figure 6B is a cross sectional view through the first side of the housing of the pulsating spray cleaning nozzle assembly of Figure 6A;

[0028] Figure 6C is a bottom view of an inlet of the housing of the pulsating spray cleaning nozzle assembly of Figure 6A;

[0029] Figure 7A is a row of images that illustrate cleaning performance of the pulsating spray nozzle assembly with a flow conditioning insert of the present disclosure;

[0030] Figure 7B is a row of images that illustrate the cleaning performance of a prior art nozzle assembly without a flow conditioning insert of the present disclosure;

[0031] Figure 8A is an image that illustrates a spray nozzle distributing a shear spray without a flow conditioning insert of the present disclosure; [0032] Figure 8B is an image that illustrates a side view of pulsating sheer spray performance of the pulsating spray nozzle assembly with a flow conditioning insert of the present disclosure; and

[0033] Figure 8C is an image that illustrates a top view of a pulsating sheer spray performance of the pulsating spray nozzle assembly with a flow conditioning insert of the present disclosure. DESCRIPTION

[0034] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. It is to be understood that other embodiments may be utilized and structural and functional changes may be made without departing from the respective scope of the present disclosure. Moreover, features of the various embodiments may be combined or altered without departing from the scope of the present disclosure. As such, the following description is presented by way of illustration only and should not limit in any way the various alternatives and modifications that may be made to the illustrated embodiments and still be within the spirit and scope of the present disclosure.

[0035] As used herein, the words "example" and "exemplary" mean an instance, or illustration. The words "example" or "exemplary" do not indicate a key or preferred aspect or embodiment. The word "or" is intended to be inclusive rather an exclusive, unless context suggests otherwise. As an example, the phrase "A employs B or C," includes any inclusive permutation (e.g., employs B; A employs C; or A employs both B and C). As another matter, the articles "a" and "an" are generally intended to mean "one or more" unless context suggest otherwise.

[0036] Similar reference numerals are used throughout the figures. Therefore, in certain views, only selected elements are indicated even though the features of the assembly are identical in all of the figures. In the same manner, while a particular aspect of the disclosure is illustrated in these figures, other aspects and arrangements are possible, as will be explained below. [0037] The present assembly described in this application involves embodiments of a nozzle assembly for use in exterior surface cleaning systems, especially in vehicles. The typical spray pattern of a fluidic nozzle is heavy ended meaning the volume of fluid spray is more pronounced along the edges of a spray pattern as dispensed from the nozzle assembly. For some application such as camera lens cleaning, shaky spray pattern is much more desirable because it is more desirable to allocate fluid spray volume towards a center of the spray pattern as a center of a camera lens is the most desired to be cleaned. However, an outer rim portion of the camera lens may be the most difficult part to clean. This disclosure provides a compact pulsating spray nozzle assembly that utilizes particular configurations found to clean camera lenses efficiently.

[0038] Turning now to a detailed description of the nozzle assembly and compact spray nozzle member of the present disclosure the attached Figures (Figures 1 through 6C) illustrate the various specific embodiments of the present disclosure.

[0039] Figure 1 illustrates an example of a housing 20 of a pulsating spray cleaning nozzle assembly 10 of the instant disclosure. The housing 20 has a generally cylindrical outer surface and comprises a base portion 22 and a head portion 24. In an embodiment, the head portion 24 may have a smaller outer perimeter that a base portion 22 of the housing 20. The head portion 24 may include a perimeter shape having curved as well as strait sides that are shaped within the perimeter of the base portion. An outlet 50 is positioned along the head portion 24 of the housing 20.

[0040] As illustrated by Figure 2, the housing 20 of the pulsating spray cleaning nozzle assembly 10 defines a cavity 30 configured to receive a flow conditioning insert 40 positioned between an inlet 70 and an outlet 50. The cavity 30 defines an interaction region 60 that is in fluid communication with the flow conditioning insert 40 and the outlet 50. In an embodiment, the flow conditioning insert 40 may be received within the housing 20 through the inlet 70 wherein the flow of fluid may be received from a fluid source (not shown) through the inlet 70. In an embodiment, the flow conditioning insert 40 may be positioned within the cavity 30 and placed within the base portion 22 of the housing while the interaction region 60 is positioned within the head portion 24 of the housing 20.

[0041] Figures 3A, 3B, and 3C illustrate an embodiment of the flow conditioning insert 40 having a particular geometry to assist with the conditioning of the flow of fluid therein between the inlet 70 and the outlet 50. Here, the insert 40 may include a geometry having an insert cavity 42 and a splitter 44 that defines a first interaction region aperture 46A and a second interaction region aperture 46B. Here, the first interaction region aperture 46A and second interaction region aperture 46B are positioned within the insert 40 and are spaced from one another by the splitter 44. The apertures 46A, 46B may have the same shape or have different shapes. In one embodiment, the apertures 46A, 46 B are generally symmetrically shaped. Further, in another embodiment, the apertures 46A, 46B may include a tapered inner surface 47A, 47B wherein an inlet portion 48A, 48B of the apertures have a larger perimeter opening than an outlet portion 49A, 49B of the apertures 46A, 46B. Notably, the inlet portion 48A, 48B of the apertures are in direct communication with the insert cavity 42 opposite from the interaction region 60. Further, the splitter may also include a tapered inner surface as illustrated by Fig. 3B.

[0042] The insert cavity 42 may be defined by a radial wall 43 that extends about a perimeter of the flow conditioning insert. The inset cavity may include a height defined by a feed distance “A” that extends from a bottom of the insert to the inlet portions 48A, 48B of the apertures 46A, 46B. In one embodiment, the feed distance “A” is less than about 3mm as illustrated by Figure 3A. The feed distance may be preferably about 2mm. It has been noticed that the longer the feed distance, the inlet flow becomes more stable therefore the resulting fan spray becomes narrow and less shaky (which is desirable for certain applications). The described configurations may allow the splitter 44 to separate the fluid flow received from the inlet 70 into two jets to be dispensed from outlets 46A and 46B which interact with one another within the interaction region 60 that is downstream of the flow conditioning insert 40. This configuration causes the two jets to “fight” each other in the interaction region before exiting the outlet 50 in a desired pulsating (i.e., shaky) spray pattern.

[0043] The cavity 30, insert 40 and inlet 70 may be aligned along a common inlet flow axis 72. The outlet 50 may extend from the interaction region 60 along an outlet axis 74. The inlet flow axis 72 and the outlet axis 74 may have a particular configuration and be arranged generally perpendicular relative to one another as illustrated by Figure 3C.

[0044] The flow of fluid may be configured to bend from its flow along the inlet axis 72 to flow along the outlet axis 74 and be dispersed from the outlet 50. In an embodiment, the flow of fluid bends about 90 degrees from the insert 40 to the outlet 50 and that bend of fluid occurs within the interaction region 60.

[0045] The cavity 30 of the housing 20 may include a step 80 positioned along the inlet axis. The step 80 may extend from an inner surface of the cavity 30 of the housing 20 downstream of the insert 40 and act to interfere with the flow of fluid as it is dispensed from outlets 46A and 46B. The step 80 may assist to create turbulent flow in the interaction region 60. Further, the step 80 may be an inwardly extending radial shoulder that acts as a stop to allow the insert 40 to be sufficiently placed within the cavity 30. The step 80 may protrude radially inwardly a first distance D1 as aligned with the outlet 50 and may protrude radially inwardly a second distance D2 at a location opposite from the first distance. The first distance D1 may be greater than the second distance D2. The step along the first distance D1 extends past a portion of the apertures 46A, 46B while the step at the second distance D2 does not extend into the perimeter of the apertures 46A, 46B.

[0046] Figures 4A and 4B illustrate an additional embodiment of the flow conditioning insert 140 and housing 20. The flow conditioning insert 140 includes a first interaction region aperture 146A and a second interaction region aperture 146B that are defined as channels along an outer perimeter of the insert 140. Here, the apertures 146 A, 146B are formed with the inner surface of the cavity 30 of the housing 20 as well as the channel walls 148A, 148B formed along a perimeter wall 149 of the insert 140. The apertures 146A, 146B are positioned to be in fluid communication with the interaction region 60.

[0047] Here the outlets are spaced further apart from each other relative to the outlets 46A, 46B of the insert 40 that includes the splitter 44 of Figures 3A, 3B, and 3C. This configuration may cause the resulting spray fan to be wider than the resulting spray fan of the insert 40. The insert 140 may include a flat portion 150 to allow for proper alignment with a complimentary shaped flat portion along the inner surface of the cavity 30. The insert 140 may include a rounded portion 160 opposite from the flat portion 150 to allow for proper alignment with a complimentary shaped rounded portion along the inner surface of the cavity 30. Further, in this embodiment, the apertures 146A, 146B may be positioned out of alignment with the step 80. The perimeter of the flow conditioning insert 140 may include a particular shape configured to be generally complimentary to the inner surface of the cavity 30 of the housing 20 to allow the insert 140 to be positioned therein while the outlets are in proper alignment with the interaction region 60.

[0048] Figures 5A and 5B illustrate an additional embodiment of the flow conditioning insert 240 and housing 20. The flow conditioning insert 240 may include an elongated body that defines a channel 242 that extends from an inlet portion 246 to an outlet portion 248. The channel 242 may be defined by oppositely disposed edges 250, 252 that extend the length of the insert 240 and also extend from a rear inner surface 241 a first dimension Cl.

[0049] An inner extending ledge 244 may be positioned within the channel 242. In an embodiment, the ledge 244 may extend between the first edge 250 to the second edge 252 and also extend from a rear inner surface 241 of the insert a second dimension C2. The configuration of the insert 240 may allow for a portion of the channel 242 to abut against the step 80 extending from the inner surface of the cavity 30. As the insert 240 is placed within the cavity 30 of the housing 20, the ledge 244 is placed in close proximity to the step 80 while the first and second edges 250, 252 may abut against the step 80. The ledge 244 is spaced from the step 80 and may be placed along an inner wall of the cavity that is opposite from outlet 50. The insert 240 and configuration of the channel 242, along with the ledge 244 and step 80 may be configured to interrupt a flow path of fluid within the housing in a general “S” shaped flow pattern configured to generate turbulent flow within the interaction region 60 downstream of the insert 240. Flow turbulence may be generated along the underside of the ledge 244 as well as the underside of the step 80 as fluid flows along the channel 242 into the interaction region 60.

[0050] Figures 6A, 6B, and 6C illustrate another embodiment of a flow conditioning insert 340 configured to be inserted into the housing 20 to condition the flow of fluid there and produce a desirable spray pattern therefrom. An inner extending slope feature 346 may be positioned within the channel 342. The flow conditioning insert 340 may include an elongated body that defines the channel 342 that extends from an inlet portion 346 to an outlet portion 348. The channel 342 may be defined by oppositely disposed edges 350, 352 that extend along the length of the insert 340 and also extend from a rear inner surface 341 a first dimension El.

[0051] In an embodiment, the slope feature 346 may extend between the first edge 350 to the second edge 352 and also extend from a rear inner surface 341 of the insert a second dimension E2. The configuration of the insert 340 may allow for a portion of the channel 342 to abut against the step 80 extending from the inner surface of the cavity 30. As the insert 340 is placed within the cavity 30 of the housing 20, the slope feature 346 is placed in close proximity to the step 80 while the first and second edges 350, 352 may abut against the step 80 but be spaced from an inner surface of the cavity 30 forming a space 356 between the flow conditioning insert 340 and inner cavity wall. The slope feature 346 is spaced from the step 80 and may be placed along an inner wall of the cavity that is opposite from outlet 50. The insert 340 and configuration of the channel 342, along with the slope feature 346 and step 80 may be configured to interrupt a flow path of fluid within the housing in a general “S” shaped flow pattern configured to generate turbulent flow within the interaction region 60 downstream of the insert 240. Flow turbulence may be generated along the underside of the slope feature 346 as well as the underside of the step 80 as fluid flows along the channel 342 into the interaction region 60.

[0052] The embodiments described herein are configured to provide a space saving configuration to allow the resulting nozzle assembly to have a smaller size than those configured for use along an outer portion of a vehicle. In one such embodiment, the housing has less than about a 7.5mm diameter and more particularly may have about a 5mm outside diameter. In one embodiment, the nozzle housing has about a 7.5mm diameter size and the cavity may include a minimum passage size that is about 0.6mm. The present disclosure provides a method of adding a flow conditioner to generate pulsating spray in a compact (7.5mm dia.) nozzle. The cleaning performance is very good even under low temperatures like -10°C utilizing a fluid mixture of methanol and water.

[0053] Figures 7A and 7B illustrate camera surfaces having debris. The left side images illustrate three (3) surfaces that were cleaned with the nozzle assembly that included the flow conditioning insert that produced the pulsating fluid flow therefrom. Here the surfaces were covered with a consistent amount of debris and the application of the pulsating spray was found to sufficiently clean the surface. The right side images illustrate three (3) surfaces that were cleaned with the nozzle assembly that did not include a flow conditioning insert and produced a steady shear jet spray therefrom (See Figure 8A). Here the surfaces were covered with a consistent amount of debris as those on the left side and the application of the resulting steady shear jet spray was found to insufficiently clean the surface.

[0054] The disclosed configurations assists to create a pulsating spray fan wherein the fluid flow from the outlet 50 is controlled in a particularly desirable manner that produces desirable washing/cleaning features. In particular, the configuration of the flow of fluid through the flow conditioner inserts 40, 140, 240 and interaction region 60 may produce a pulsating spray fan that is controlled to be “shaky” but with a focused aim. In one embodiment, the pulsating spray fan has an aim angle of about 0 degrees and a spray fan angle of about 15 degrees. This spray fan behavior was achieved at a flow rate of about 440ml/min at about 20 psi. This behavior is illustrated by Figures 8B and 8C. Notably, the flow patern behavior without a flow conditioning insert of any kind is illustrated by Figure 8A.

[0055] Although the embodiments of the present disclosure have been illustrated in the accompanying drawings and described in the foregoing detailed description, it is to be understood that the present disclosure is not to be limited to just the embodiments disclosed, but that the disclosure described herein is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the claims hereafter. The claims as follows are intended to include all modifications and alterations insofar as they come within the scope of the claims or the equivalent thereof.