Abstract:
In one aspect of the invention a detachable lens shield is formed of relatively resiliently deflectable material and made in a generally tubular configuration with an internally formed textured-like surface for enhancing the gripping action thereof onto a coating lens.

Description:
BACKGROUND OF THE INVENTION 
     Generally, in the automotive field, especially with regard to trucks, indicator lamp assemblies are employed as to indicate, as by their respective energization, that, for example, certain selected functions or vehicular operating parameters are in an unacceptable condition. For example, as in a truck, such indicator lamp assemblies may be operatively connected to related sender units which are, in turn, responsive to indicia of engine oil level, engine temperature, loss of engine coolant, generator or alternator output level, actuation or operation of anti-skid mechanism, air pressure in truck air tanks, headlamp selection (whether high or low beam), or parking brake engagement. 
     The truck industry has, heretofore, employed one or more of such indicator lamp assemblies to thereby create, upon energization thereof, a visual signal to the operator that a particular parameter is experiencing less than satisfactory conditions thereby enabling the operator or driver to take corrective action which, in fact, may require the immediate shut-down of the engine. 
     Usually a plurality of such indicator lamp assemblies are employed and mounted on the vehicular dash or instrument panel. Each of such indicator lamp assemblies comprises a lens portion which may be threadably or otherwise secured to the remaining portion of the lamp assembly in a manner whereby the lens protrudes some distance from the plane of the instrument panel. This, in turn, has caused problems to arise. That is, for example, because of the protruding nature of such lenses, they, to some degree, form a safety hazard if, during a vehicular collision or the like, struck against by the vehicle operator. Also, because the indicator light assemblies are often located close to each other, the light eminating from one energized assembly sometimes causes the lens of an adjoining light assembly to appear as if it, too, is lit. The same applies to the various lenses when they are struck by rays of sunlight or rays of light reflected as from components within the passenger compartment of the vehicle. Such apparent but not actual energization of the indicator lamp assemblies conveys incorrect and misleading information to the vehicle operator. 
     Accordingly, the invention as herein disclosed and claimed is directed primarily to the solution of the foregoing as well as related and attendant problems. 
     SUMMARY OF THE INVENTION 
     According to one aspect of the invention, a lens shroud or shield has a generally tubular body with a continuous wall which, in turn, has an external wall surface and an internal wall surface, and the internal wall surface is provided with a generally textured portion for enhancing the detachable securing of the lens shroud body as to a cooperating lens. 
     Various general and specific objects and advantages of the invention will become apparent when reference is made to the following detailed description considered in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the drawings wherein for purposes of clarity certain details and/or elements may be omitted from one or more views: 
     FIG. 1 is a fragmentary perspective view of an interior of a truck cab having an instrument panel employing, typically, indicator lamp assemblies to which the invention may be applied; 
     FIG. 2 is an enlarged fragmentary cross-sectional view taken generally on the plane of line 2--2 of FIG. 1, and looking in the direction of the arrows, with a lens shield of the invention; 
     FIGS. 3 and 4 are elevational views, in reduced scale, taken respectively on the planes of lines 3--3 and 4--4 of FIG. 2 and looking in the direction of the arrows; 
     FIG. 5 is an enlarged view of a fragmentary portion of FIG. 2; 
     FIG. 6 is a view similar to that of FIG. 5 and illustrating a modification of the portion shown in FIG. 5; 
     FIG. 7 is a view similar to that of FIG. 2, in reduced scale, and illustrating the use of a shield of the invention in combination with a relatively short lens; 
     FIG. 8 is an axial cross-sectional view of another embodiment of the invention; 
     FIGS. 9 and 10 are elevational views taken respectively on the planes of lines 9--9 and 10--10 of FIG. 8 and looking in the direction of the arrows; 
     FIG. 11 is an end view of a further embodiment of the invention; 
     FIGS. 12 and 13 are respectively cross-sectional and elevational views respectively taken on the planes of lines 12--12 and 13--13 of FIG. 11 and looking in the direction of the arrows; 
     FIG. 14 is an end elevational view taken on the plane of line 14-14 of FIG. 12 and looking in the direction of the arrows; 
     FIG. 15 is an end view of yet another embodiment of the invention; and 
     FIGS. 16 and 17 are respectively cross-sectional and elevational views respectively taken on the planes of lines 16--16 and 17--17 of FIG. 15 and looking in the direction of the arrows. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now in greater detail to the drawings, FIG. 1 illustrates the interior of a truck cab 10 as being comprised of, for example: a driver&#39;s or operator&#39;s seat assembly 12; steering wheel and column assembly 14; windshield 16; operator&#39;s foot actuated levers and pedals 18, 20 and 22; instrument panel assembly 24 comprising a panel-like support 25 and an array of gauges 26, 28, 30, 32 and 34; controls 36 and 38; and a plurality of indicator lamp assemblies 40,42,44,46 and 48 with any of which the lens shield means of the invention may be employed. The lens shield of the invention is not shown in FIG. 1 because such would obscure the general configurations of the various lenses 50, 52, 54, 56 and 58 which comprise some of the configurations with which the lens shield means of the invention may be employed. For example, lenses 50 and 52 are each of generally cylindrical configuration with lens 50 being relatively shorter in axial length; lens 54 is of a generally rectangular (as possibly a right parallelepiped) configuration; lens 56 may, in front projected view be a square; while lens 58 may have a curvilinear, spherical or bulbous-like projecting outer surface. 
     Referring to FIG. 2, the indicator lamp assembly 44, which may be of any desired type or configuration, is shown as comprising lamp housing means 60 which, in turn, supports electrical bulb means 62 which, as is for example well known in the art, is operatively connected to any suitable related electrical circuitry (not shown). Housing means 60 is provided with shoulder or abutment means 64, which is operatively engaged with one side of panel or support means 25, and a necked-down or diametrically reduced tubular extension 66 which passes through an aperture 68 in the mounting means 25. The lens 52, as shown in both FIGS. 1 and 2, has a main body 70 of generally cylindrical configuration which may include recess or cavity means 72 for accommodating the bulb 62. A pair of relatively resiliently deflectable leg portions 74 and 76 carried by lens body 70 are respectively provided with radially outwardly directed bead-like portions 78 and 80 which cooperate with, for example, an annular ramp surface 82 of a radially inwardly directed retainer portion 84, carried by the housing extension 66, to retain lens 52 assembled onto the housing means 60. As can be seen, the housing extension 66 is externally threaded as at 86 to enable threadable coaction with a retainer nut 88 which, as through washer means 90, serves to draw the shoulder abutment means 64 of housing 60 tightly into locked engagement with mounting means 25. 
     The lens shield means 92 is illustrated as being a body of generally tubular configuration with an outer wall surface 94 which, for example, may be generally conical as to have its widest diameter at its base adjacent the support means 25 and its narrowest diameter in the vicinity of the projecting end of lens 52. (When viewed in elevation, such a contemplated configuration of the lens shield means 92 would appear as a truncated right circular cone.) The inner surface means of lens shield means 92 is illustrated as being comprised of various surface portions the first of which is an inner conical surface 96 which has its widest most diameter breaking or opening into forward end surface 98 while its narrowest diameter at least closely approaches the outer surface 100 of lens 52 as to generally meet with a contoured or textured gripping surface means 102. 
     As can be better seen in the enlarged fragmentary view of FIG. 5, the gripping or retainer surface means 102 is shown as comprising a plurality of axially spaced annular protuberances 104, 106, 108 and 110 formed as to be extending or directed generally radially inwardly toward the axis 112. In one successful embodiment of the invention, the annular protuberances 104, 106, 108 and 110 were axially spaced from each other as by discontinuous-like flat annular land portions 113, 114 and 116. As shown in FIG. 2, the contour of the protuberances or gripping portions 104, 106, 108 and 110, when viewed in axial cross-section, is that of a circular arc. However, it should be apparent that other configurations are possible and contemplated as coming within the scope of the invention; one of such other configurations is illustrated in FIG. 6 to be hereinafter described in detail. Although the lens shield means of the invention may be formed of any suitable material, in its preferred embodiment, the invention is preferably formed of rubber, high temperature silicone compound rubber, or polyvinyl chloride with a hardness in the order of a 76 Durometer rating. Further, as generally illustrated in FIG. 5, in the preferred embodiment, the protuberances 104, 106, 108 and 110 extend radially inwardly as to all be tangent as to a line 118 (for a cylindrical trace) which is generally parallel to centerline or axis 112. However, it is also contemplated that such a trace 118 may, of course, be conically inclined as to result in, for example, the forward most portion of the gripping means 102, as, for example, annular protuberance 104 having the relatively smallest inner diameter. 
     The fragmentary portion shown in FIG. 5 illustrates the gripping means 102 in its free state while as generally depicted in FIG. 2 the same means 102 is illustrated in a somewhat compressed state caused by the lens shield means 92 being pushed onto lens 52 and thereby resulting in an interference fit between the means 102 and outer surface 100 of lens 92 causing a resilient deformation of the protuberances comprising means 102. 
     Referring to FIGS. 2 and 4, the rearward or base end 120 of lens shield means 92 is provided with a generally cylindrical recess 122 formed therein. As generally depicted, the radially extending annular surface 124 is preferably axially located as to be in a plane in at least close proximity to the rearward end of the gripping means 102. As shown in FIG. 2, the recess 122 is effective for accommodating therein the nut 88 and washer or spacer means 90 as to thereby provide an aesthetic outer apppearance to the light assembly 44 with which the lens shield means is associated. 
     FIG. 6, a view similar to that of FIG. 5, illustrates one modified configuration of gripping means 102a functionally equivalent to gripping means 102. In FIG. 6 the gripping or retainer surface means 102a is illustrated as comprising a plurality of generally axially spaced annular protuberances 126, 128, 130, 134 and 136 formed as to be extending or directed generally radially inwardly toward the axis 112. The contour of the protuberances or gripping means 126, 128, 130, 134 and 136, when viewed in axial cross-section, is that of a plurality of generally finger-like portions tapering as to be narrower in cross-sectional thickness the closer such finger-like portions approach axis 112. As generally illustrated, the free ends of protuberances or grippers 126, 128, 130, 134 and 136 may be tangent to a line 118 (or a cylindrical trace) which is generally parallel to centerline 112. However, it is also contemplated that such a trace 118 may, of course, be inclined or otherwise non-parallel to centerline 112. 
     Further, it is contemplated that surface 96 may be either formed to be very smooth, polished or even provided with a reflecting coating 140 as to thereby aid in re-directing generally forwardly such light rays as travel generally radially outwardly from the lens 50. In effect, this causes the viewer to see what would appear to be a larger light when bulb 62 is energized. This effect is present even when surface 96 is not polished or coated with reflecting material; however, such polishing and/or reflectorizing further enhances such effect. 
     FIG. 7 illustrates how, for example, a standard size of lens shield means 92 may be similarly employed in combination with a relatively short lens 142 much like the lens 50 depicted in FIG. 1. 
     FIG. 8, 9 and 10 illustrate another embodiment of the invention which is not of cylindrical configuration but rather square-like. Elements in FIGS. 8, 9 and 10 which are like or functionally similar to those of the preceding Figures are identified with like reference numbers provided with a suffix &#34;b&#34;. As can be seen, the outer wall surfaces 146, 148, 150 and 152 are planar and inclined toward the axis 112b. Similarly, but inclined in the opposite direction, are inner wall surfaces 154, 156, 158 and 160 which also ae planar. 
     FIGS. 11, 12, 13 and 14 illustrate other modifications of the invention. Elements in FIGS. 11, 12, 13 and 14 which are like or similar to those of FIG. 2-7 are identified with like reference numbers provided with a suffix &#34;c&#34;. Further, in the embodiment of FIG. 13, it can be seen that the inner wall surface 96c is generally tubular and not inclined as wall surface 96 of FIG. 2. Also, as shown in FIGS. 11, 12 and 14, the invention may be further modified by forming a slot 162 therethrough in any radial direction selected by the placement of the shield means relative to its associated lens. As shown in FIG. 14 such a slot or light passage 162 may be formed as a sector with radially directed walls or surfaces 164 and 166 which meet an axial wall 168. 
     FIGS. 15, 16 and 17 illustrate a further modification of the invention. Elements in FIGS. 15, 16 and 17 which are like or functionally similar to those of FIGS. 11-14 are identified with like reference numbers provided with a suffix &#34;d&#34;. In comparing the embodiments of FIGS. 11-14 to FIGS. 15-17, it can be seen that in, for example, FIG. 16, the forward end 98d extends across the entire front as by a forward wall portion 170 into which inner wall surface 96d terminates at its forward-most end. Again, the inner surfaces may be provided with a reflective coating as to enhance the amount of light directed through the slot 162d while the forward closed end of the shield means 92d prevents any light from being emitted therefrom. 
     It should be apparent that the invention, because of the relatively resiliently deflectable gripping means enables the use of such shield means in combination with various forms of light indicator assemblies regardless of the configuration of the associated lens and regardless of the manner in which such lens is retained by or connected to the remaining portion of the light indicator assembly. The fact that such a textured or otherwise contoured resiliently deflectable gripping means is provided enables such gripping or retainer means to engage the outer surface or edge of any associated lens even when such a lens is a relatively short spherical sector in configuration. Further, the assembly and disassembly of a lens shield, according to the invention, to and from a related lens requires no disassembly of the associated lens or related light indicator assembly as is often the case with prior art apparatus providing a light shielding function. 
     The invention contemplates further modifications not specifically shown and it should be apparent that the invention may be practiced without the use of recess means as at, for example, 122 of FIG. 2. However, the use of such a recess means 122 is desirable in that it permits an increased degree of resilient deflection when the shield means is being pushed onto the associated lens and thereby providing for the assured gripping of the gripping means 102 with any available outer edge or surface of the lens. 
     Although only one preferred embodiment and a select number of modifications of the invention have been disclosed and described, it is apparent that other embodiments and modifications of the invention are possible within the scope of the appended claims.