Abstract:
The present invention discloses a unique and novel system for attaching an auxiliary lens assembly to a primary lens assembly in which the attachment includes two alternative positions, a lowered position and a raised position. In the lower position, the person wearing the eyewear system views through both the primary lenses and auxiliary lenses. In the raised position, the person wearing the eyewear system views only through the primary lenses. As a further option, the auxiliary lens assembly is easily removable from the primary lens assembly, allowing for separate storage of the auxiliary lens assembly when not needed. Slotted extensions on the primary lens frame receive retainers attached to auxiliary extensions on the auxiliary lens assembly. Each auxiliary extension has a rocker pivotally attached to a keyseat. An internal spring urges the rocker into snap alignment with the surfaces of the keyseat.

Description:
RELATED ART  
       [0001]     This patent claims priority to U.S. Provisional Application 60/514,323, filed Oct. 24, 2003. 
     
    
     TECHNICAL FIELD OF INVENTION  
       [0002]     The present invention relates to eyewear, and in particular, to a design for and auxiliary lens assembly and primary lens assembly combination in which the auxiliary lens assembly is adapted for rotatable and removable attachment to the primary lens assembly. More specifically, the present invention discloses to an auxiliary eyewear support system that utilizes pivotal hinges integral to the auxiliary frame, which permit rotation of the auxiliary frame from a first position in which the auxiliary lenses are substantially parallel to the primary lenses, to a second position in which the auxiliary frame is rotated into a position substantially perpendicular to the orientation of the primary frame.  
       BACKGROUND OF THE INVENTION  
       [0003]     It has long been desirable to have a removable auxiliary lenses attached to eyeglasses. Professional baseball players have used “flip-up” auxiliary lenses for more than four decades to protect their eyes from the sun, but to allow them unrestricted vision in the event the ball was hit in their vicinity.  
         [0004]     U.S. Pat. No. 3,252,747 to Robins discloses an eyewear system specifically designed for persons who are far-sighted. The device includes an assembly in which an auxiliary frame assembly containing lenses may be rotated about the horizontal axis and remain attached to a primary assembly so as to locate the lenses the proper distance to the eyes every time the device is lowered into place. A significant disadvantage of this design is that it is unattractive, overly complicated, impossible to segregate from the primary frame, and does not permit or accommodate anyone other than far sighted individuals.  
         [0005]     U.S. Pat. No. 6,089,708 to Ku discloses a connecting member having spaced connecting plates for attachment to the bridge portion of a primary lens assembly. The connecting plates have magnetic members that act cooperatively with a complimentary magnetic member inserted in a hole on the bridge. The front of the connecting part has an open communication to a polygonal-shaped holding room. The auxiliary frame has connecting rods extending above the bridge portion, and supporting an intermediate portion having a polygonal shape, receivable and rotatable in the holding room. A significant disadvantage of this design is that it is unattractive, overly complicated, and resist easy and immediate removal of the auxiliary lens assembly.  
         [0006]     U.S. Pat. No. 3,238,005 to Petitto discloses the combination of a primary lens assembly and auxiliary lens assembly. The auxiliary assembly has flexible side wall projections with openings that can be assembled onto lugs (pins) extending perpendicularly from the sides of the primary assembly, allowing the auxiliary assembly to be pivoted upwards, and back downwards. Leaf springs mounted on the auxiliary assembly engage surfaces of the primary assembly to urge the auxiliary assembly into position. A significant disadvantage of this design is that it is unattractive, overly complicated, and resist easy and immediate removal of the auxiliary lens assembly.  
         [0007]     As stated, these and other mechanically “clipped-on” devices for holding auxiliary lenses are cumbersome and unattractive. More recently, numerous attempts have been made to magnetically attach an auxiliary lens assembly to a primary lens assembly.  
         [0008]     U.S. Pat. No 4,070,103 to Meeker discloses a primary lens assembly having a slidably attachable auxiliary lens assembly. In this device, the primary lens assembly is made of magnetizable material and auxiliary lenses are individually securable to the primary lens assembly by a magnetic band inserted in a groove on the inside surface of the individual auxiliary lens assembly. This design is not pivotal, and the auxiliary assembly must be physically removed.  
         [0009]     U.S. Pat. No. 5,416,537 to Sadler discloses a primary lens assembly having a first magnetic member attached vertically to the front surface of the primary lens assembly, and a second magnetic member attached in a corresponding position on the back surface on an auxiliary lens assembly. The magnetic members are arranged for engagement to secure the auxiliary lens assembly to the primary lens assembly. This design is not pivotal, and the auxiliary assembly must be physically removed.  
         [0010]     U.S. Pat. No. 5,568,207 to Chao also discloses a magnetically adhered auxiliary lens assembly, with the additional feature of arms extending from the side portions of the auxiliary lens assembly, over magnet retaining projections and extensions of the primary lens assembly. The arms engage with, and are supported on, the primary lens assembly extensions to prevent disengagement of the auxiliary lens assembly upon downward movement of the auxiliary lens assembly relative to the primary lens assembly. This design is not pivotal, and the auxiliary assembly must be physically removed.  
         [0011]     Auxiliary eyewear systems such as those described above require the auxiliary frame assembly be removed from the primary frame assembly, and then handled and stored separately when it is necessary for the eyeglass wearer to look only through the lenses of the primary frame assembly. They do not enjoy the advantages of the early flip-up designs, which permitted quick movement of the auxiliary assembly out of alignment with the primary assembly without separating them from the primary assembly.  
         [0012]     U.S. Pat. No. 6,474,811 to Liu discloses a magnetically attached auxiliary lens assembly in which the auxiliary assembly can be magnetically attached to the either the inside or outside of extensions having magnets on the primary assembly. The auxiliary assembly is pivotal upwards, removing the pivotal alignment of the auxiliary and primary lenses. A significant disadvantage of this design is that it is unstable, relying on tenuous repositioning, and magnetic forces alone to align and support the auxiliary assembly to the primary assembly. Another significant disadvantage of this design is that causes the auxiliary frame to be positioned into the forehead of the wearer, making raising the auxiliary assembly fully perpendicular to the primary assembly impractical.  
         [0013]     U.S. Pat. No. 6,301,953 to Xiao discloses an auxiliary lens assembly having pivots mounted above the lenses and attached by long, L-shaped shelter arms. The shelter arms are attached to supporting arms having magnet holding housings attached at their ends. Magnets are inset in the housings for engagement over rearwardly protruding rim lockers. One disadvantage of this design is that it is fails to limit the rotation of the auxiliary lens assembly. Another disadvantage is that it is esthetically unappealing, due in part to the long shelter arm requirement. Another disadvantage is that it relies on a bridge magnet or bridge hook for stability. Another disadvantage is that the device relies on magnetic force to pull the magnetic housing forward, over a rearward protruding lens locker, requiring the user push the auxiliary frame awkwardly rearward, into the primary frame, to disengage the magnetic housing from over the lens locker. Another disadvantage is that the device is complex and expensive to manufacture.  
         [0014]     It can thus be seen that there is a need to develop a design for an auxiliary frame assembly and primary frame assembly combination in which the auxiliary frame assembly can be flipped into a position in which the contribution of the auxiliary lenses is temporarily removed, without detaching the auxiliary lens assembly from the primary frame assembly, which is capable of accurately aligning the auxiliary and primary assemblies and stably supporting them.  
       SUMMARY OF THE INVENTION  
       [0015]     A primary advantage of the present invention is that it provides accurate, snap alignment of the auxiliary lens assembly to the primary lens assembly when raised and when lowered back into position. Another advantage of the present invention is that it provides an auxiliary lens assembly and primary lens assembly combination in which the auxiliary lens assembly is easily installed and removed from the primary lens assembly. Another advantage of the present invention is that it provides a means of temporary displacement of the auxiliary lenses without a need for complete removal and separate storage of the auxiliary lens assembly.  
         [0016]     Another advantage of the present invention is that it provides an auxiliary lens assembly and primary lens assembly combination which resists unintended disengagement. Another advantage of the present invention is that it is simple and aesthetically attractive. Another advantage of the present invention is that it provides the fully perpendicular alignment of the auxiliary assembly to the primary assembly without contacting the forehead of the person wearing the device. Another advantage of the present invention is that it provides a primary lens assembly optionally compatible with non-rotatable auxiliary lens assemblies. Another advantage of the present invention is that it provides optional embodiments that can be constructed without magnets.  
         [0017]     Other advantages of the present invention will become apparent from the following descriptions, taken in connection with the accompanying drawings, wherein, by way of illustration and example, an embodiment of the present invention is disclosed. As referred to hereinabove, the “present invention” refers to one or more embodiments of the present invention which may or may not be claimed, and such references are not intended to limit the language of the claims, or to be used to construe the claims in a limiting manner.  
         [0018]     In accordance with one aspect of the invention, there is provided a primary lens assembly retaining a pair of primary lenses. An auxiliary lens assembly retains a pair of auxiliary lenses. The auxiliary lens assembly may be attached to the primary lens assembly. In this manner, the person wearing the eyewear system has two lenses combining to alter the transmission of light to each eye.  
         [0019]     In the preferred embodiment, the primary lens assembly has a primary frame for retaining a pair of primary lenses. A pair of slotted extensions are attached to the primary frame. A primary magnet is located in each slotted extension. An auxiliary lens assembly is provided having an auxiliary frame for retaining a pair of auxiliary lenses. A pair auxiliary extensions are attached to the auxiliary frame. A pair of brackets are attached to the auxiliary frame. A rocker is pivotally attached to each bracket. An arm extends from the other side of the rocker. A retainer is attached to each arm. The retainers are locatable within the slotted extensions of the primary frame. An auxiliary magnet is located in each retainer.  
         [0020]     In a second embodiment, the retainers are solid, have no magnets, and are made of magnetic material. In a third embodiment, rear extension portions are solid, have no magnets, and are made of magnetic material. In a fourth embodiment, the retainers are directly connected to the ends of the brackets. In this embodiment, the auxiliary lens assembly is not rotatable relative to the primary lens assembly.  
         [0021]     In a fifth embodiment, no magnets are required in either the primary lens assembly or the auxiliary lens assembly, and the retainers and slotted extensions need not be made of magnetic material. Compressible bushings are located in the retainers in substitution for the magnets. In a sixth preferred embodiment, no magnets are required in either the primary lens assembly or the auxiliary lens assembly, and the retainers and slotted extensions need not be made of magnetic material. The retainers are directly connected to the ends of the brackets. Compressible bushings are located in the retainers.  
         [0022]     In the preferred embodiment, the primary lenses may be corrective lenses and the auxiliary lenses may be light transmission reducing lenses, for example, a polarizing, absorbing, refracting, photochromatic, or reflecting lenses, or any combination thereof (i.e., sunglasses). In a seventh embodiment, the primary lenses are corrective lenses and the auxiliary lenses are impact resistant and/or radiation resistant (i.e.. welding lenses) safety lenses. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0023]     The objects and features of the invention will become more readily understood from the following detailed description and appended claims when read in conjunction with the accompanying drawings in which like numerals represent like elements.  
         [0024]     The drawings constitute a part of this specification and include exemplary embodiments of the invention, which may be embodied in various forms. It is to be understood that in some instances various aspects of the invention may be shown exaggerated or enlarged to facilitate an understanding of the invention.  
         [0025]      FIG. 1  is an isometric view of a preferred embodiment of the present invention, disclosing a primary lens assembly and an auxiliary lens assembly illustrating the assemblies attached, with the auxiliary lens assembly in the lower position.  
         [0026]      FIG. 2  is an isometric view of the preferred embodiment disclosed in  FIG. 1 , illustrating the primary lens assembly by itself.  
         [0027]      FIG. 3  is an isometric breakout view of the preferred embodiment of the primary lens assembly illustrated in  FIGS. 1-2 .  
         [0028]      FIG. 4  is an isometric view of the preferred embodiment illustrated in  FIG. 1 , illustrating the auxiliary lens assembly by itself, in the lowered position.  
         [0029]      FIG. 5  is an isometric breakout view of the preferred embodiment of the auxiliary lens assembly illustrated in  FIG. 1 .  
         [0030]      FIG. 6  is an isometric view of a bracket portion of the auxiliary lens assembly.  
         [0031]      FIG. 7  is an isometric breakout view of the preferred embodiment illustrated in  FIGS. 1-6 , illustrating the assemblies attached, with the auxiliary lens assembly in the lowered position, and illustrating mechanical and magnetic engagement between the primary lens assembly and the auxiliary lens assembly.  
         [0032]      FIG. 8  is an isometric breakout view of the preferred embodiment illustrated in  FIGS. 1-7 , illustrating the assemblies attached, with the auxiliary lens assembly in the raised position.  
         [0033]      FIG. 9  is a front view of the preferred embodiment illustrated in  FIGS. 1-8 , illustrating the assemblies attached, with the auxiliary lens assembly in the lowered position.  
         [0034]      FIG. 10  is a front view of the preferred embodiment illustrated in  FIGS. 1-9 , illustrating the assemblies attached, with the auxiliary lens assembly in the raised position.  
         [0035]      FIG. 11  is a side sectional view of the preferred embodiment illustrated in  FIGS. 1-10 , illustrating the assemblies attached, with the auxiliary lens assembly in the lowered position.  
         [0036]      FIG. 12  is a side sectional view of the preferred embodiment illustrated in  FIGS. 1-11 , illustrating the assemblies attached, with the auxiliary lens assembly in the raised position.  
         [0037]      FIG. 13  is an isometric breakout view of a second embodiment, in which the retainer is made of a magnetic material, and no auxiliary magnet is required.  
         [0038]      FIG. 13  is an isometric breakout view of a third embodiment, in which the rear extension portion is made of a magnetic material, and no primary magnet is required.  
         [0039]      FIG. 15  is an isometric breakout view of a fourth embodiment of the auxiliary lens assembly, in which a non-rotatable auxiliary lens assembly is shown.  
         [0040]      FIG. 16  is an isometric breakout view of the preferred embodiment of the primary lens assembly associated for use with the embodiment of the auxiliary lens assembly illustrated in  FIG. 15 , illustrating the same elements disclosed in  FIG. 3 .  
         [0041]      FIG. 17  is an isometric breakout view of the embodiment illustrated in  FIGS. 15 and 16 , illustrating the assemblies detached.  
         [0042]      FIG. 18  is an isometric breakout view of the embodiment disclosed in  FIGS. 15-17 , illustrating the auxiliary assembly attached to the primary lens assembly. The mechanical and magnetic engagement between the primary lens assembly and the auxiliary lens assembly is illustrated.  
         [0043]      FIG. 19  is an isometric breakout view of a fifth embodiment, illustrating the auxiliary lens assembly having a compressible bushing located in place of the auxiliary magnet.  
         [0044]      FIG. 20  is an isometric breakout view of the preferred embodiment of the primary lens assembly configured for connection to the embodiment of the auxiliary lens assembly disclosed in  FIG. 19 .  
         [0045]      FIG. 21  is a side sectional view of the preferred embodiment illustrated in  FIGS. 19-20 , illustrating the primary and auxiliary lens assemblies partially attached, illustrating the compression of the auxiliary bushing engaging the slot of the primary extension.  
         [0046]      FIG. 22  is a side sectional view of the preferred embodiment illustrated in  FIG. 21 , illustrating the primary and auxiliary lens assemblies attached, with the auxiliary lens assembly in the lowered position.  
         [0047]      FIG. 23  is an isometric breakout view of a sixth embodiment that combines elements disclosed in the fourth and fifth embodiments and illustrated in  FIGS. 15-22 .  
         [0048]      FIG. 24  is a side sectional view of the embodiment illustrated in  FIG. 23 , illustrating the primary and auxiliary lens assemblies partially attached, with the auxiliary lens assembly in the lowered position.  
         [0049]      FIG. 25  is an isometric breakout view of the embodiment illustrated in  FIGS. 23-24 , illustrating the primary and auxiliary lens assemblies attached, with the auxiliary lens assembly in the lowered position.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0050]     The following description is presented to enable any person skilled in the art to make and use the invention, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.  
         [0051]     The terms “right” and “left” as used herein are referenced from the perspective of a person wearing the primary and auxiliary lens assemblies. The references are intended to aide in the description of the device, and are not intended to be limiting, since the preferred embodiments of the device are generally symmetric.  
         [0052]      FIG. 1  is an isometric view of a preferred embodiment of the present invention. In this view, a primary lens assembly  100  is illustrated with an auxiliary lens assembly  200  attached.  
         [0053]      FIG. 2  is an isometric view of a preferred embodiment of primary lens assembly  100 . In the embodiment shown in this view, primary lens assembly  100  includes a primary frame  102 . Primary frame  102  has a primary bridge  104 . Primary frame  102  retains a pair of lenses  106 . A pair of slotted extensions  108  extend outward, one from each side of primary frame  102 .  
         [0054]      FIG. 3  is an isometric breakout view of the preferred embodiment of primary lens assembly  100 . While this and other views illustrate the right side of primary lens assembly  100 , the left side is similarly configured. In the embodiment shown in this view, slotted extension  108  has a front extension portion  110  and a rear extension portion  120 . In a preferred embodiment, front extension  110  is partially co-joined to rear extension  120 . In this manner of attachment, a slot  130  is formed between front extension  110  and rear extension  120 . In the preferred embodiment shown, a primary magnet  122  is located within rear extension  120 . In a still more preferred embodiment, front extension  110  is made of a magnetic material.  
         [0055]     Primary magnets  122  may have a cylindrical geometry. If so, the flat surfaces (cylinder ends) of primary magnets  122  are preferably oriented in roughly parallel relationship to the surfaces of lenses  106 . In a preferred embodiment, a leg  140  is pivotally attached to each front extension  110 .  
         [0056]      FIG. 4  is an isometric view of the preferred embodiment disclosed in  FIG. 1 , illustrating the auxiliary lens assembly  200  by itself, in a lowered position. In the embodiment shown in this view, auxiliary lens assembly  200  includes an auxiliary frame  202 . Auxiliary frame  202  has an auxiliary bridge  204 . Auxiliary frame  202  retains a pair of lenses  206 . Auxiliary frame  202  has a pair of auxiliary extensions  208  extending outward from the sides of auxiliary frame  202 .  
         [0057]      FIG. 5  is isometric breakout view of the embodiment of auxiliary lens assembly  200  shown in  FIG. 4 . As shown in this view, auxiliary extension  208  has a bracket  210 .  FIG. 6  is an isometric view of bracket  210  of auxiliary extension  208 . As shown in this view, and as related to  FIG. 5 , bracket  210  has a first end portion  212  attached to auxiliary frame  202 , and a keyseat  214  located on its opposite end. In a preferred embodiment, keyseat  214  is substantially rectilinear, having a top  214   a  and a flat end face  214   b  that is substantially perpendicular to top  214   a . In the preferred embodiment, top  214   a  is substantially flat. Keyseat  214  also has pair of opposite flats  214   c  and  214   d  in substantially parallel relationship to each other. A hole  216  extends between flats  214   c  and  214   d.    
         [0058]     Referring to  FIG. 5 , auxiliary extension  208  has a hollow bodied rocker  220 . Rocker  220  has a slotted end  222 . Slotted end  222  is adapted to receive keyseat  214  of bracket  210 . A pivot pin  224  extends through slotted end  222  and through hole  216  to pivotally attach rocker  220  to bracket  210 . In a more preferred embodiment, pivot pin  224  is threadedly connected to slotted end  222 .  
         [0059]     Rocker  220  has an internal spring  226  (not shown) with a substantially flat end cap  228  (not shown). When auxiliary lens assembly  200  is in the lowered position, internal spring  226  compresses end cap  228  against end face  214   b . When auxiliary lens assembly  200  is in the raised position, internal spring  226  compresses end cap  228  against top  214   a  of keyseat  214 , between flats  214   c  and  214   d.    
         [0060]      FIG. 7  is an isometric breakout view of the preferred embodiment disclosed in  FIG. 1-6 , illustrating auxiliary lens assembly  200  attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the lowered position.  FIG. 7  illustrates the mechanical and magnetic engagements between primary lens assembly  100  and auxiliary lens assembly  200 .  FIG. 8  is an isometric breakout view of the embodiment disclosed in  FIG. 7 , illustrating auxiliary lens assembly  200  attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the raised position.  
         [0061]      FIG. 9  and  FIG. 10  are front views of the preferred embodiment disclosed in  FIGS. 1-8  showing auxiliary lens assembly  200  attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the lowered and raised positions respectively.  FIG. 11  and  FIG. 12  are side-sectional views of the preferred embodiment disclosed in  FIGS. 1-10  showing auxiliary lens assembly  200  attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the lowered and raised positions respectively.  
         [0062]     In the preferred embodiment, an arm  230  extends from rocker  220 . A retainer  232  is located at the end of arm  230 . In a preferred embodiment, arm  230  may be U-shaped, locating retainer  232  immediately beneath and below pivot pin  224 . In the preferred embodiment, retainer  232  has a hollow center, and an auxiliary magnet  234  is located within retainer  232  of arm  230 .  
         [0063]     Auxiliary magnets  234  may have a cylindrical geometry. If so, the flat surfaces (cylinder ends) of auxiliary magnets  234  are oriented in approximate parallel relationship to the surfaces of primary lenses  106  when auxiliary lens assembly  200  is attached to primary lens assembly  100 .  
         [0064]      FIG. 13  discloses a second embodiment. In this embodiment, retainers  232  are solid (have no magnets), and are made of magnetic material. Retainers  232  may be formed integrally from the ends of brackets  210 . Retainers  232  are subject to magnetic attraction from primary magnets  122 .  
         [0065]      FIG. 14  discloses a third embodiment. In this embodiment, rear extension portions  120  are solid, (have no magnets) and are made of magnetic material. Rear extension portions  120  are subject to magnetic attraction from auxiliary magnets  232 .  
         [0066]      FIG. 15  discloses a fourth embodiment of auxiliary lens assembly  200 . In this somewhat simpler embodiment, auxiliary extensions  208  do not incorporate keyseat  214 , rocker  220  or arm  230 . Retainers  232  are attached to the ends of brackets  210 . Auxiliary magnets  234  are contained in retainers  232 . This configuration of auxiliary lens assembly  200  represents a known and readily available configuration.  FIG. 16  discloses the complimentary primary lens assembly  100 , which is the same as that of  FIG. 3 .  FIG. 17  illustrates the auxiliary lens assembly  200  partially combined with primary lens assembly  100 .  FIG. 18  illustrates the full engagement of auxiliary lens assembly  200  with primary lens assembly  100 . This combination demonstrates the compatibility of the primary lens assembly  100  of the present invention with existing, non-rotatable auxiliary lens assemblies  200 .  
         [0067]      FIG. 19  discloses a fifth embodiment of auxiliary lens assembly  200 . In this embodiment, retainers  232  have a hollow center. Compressible bushings  236  are located in retainers  232 , in substitution for magnets  234 .  FIG. 20  illustrates the preferred embodiment of primary lens assembly  100  associated for use with the embodiment of the auxiliary lens assembly  200  illustrated in  FIG. 19 . Rear extension portion  120  is solid. No magnets are required. In this embodiment, the width of slot  130  is less than the thickness of bushing  236 , to permit a secure interference fit. This embodiment of primary lens assembly  100  is also compatible with existing, non-rotatable rotatable auxiliary lens assemblies  200 , when front extension portions  110  and/or rear extension portions  120  are made of magnetic material.  
         [0068]      FIG. 21  and  FIG. 22  are side-sectional views of the embodiment disclosed in  FIGS. 19-20 .  FIG. 21  shows auxiliary lens assembly  200  partially attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the lowered position, and illustrating the compressibility of bushing  234 .  FIG. 22  shows showing auxiliary lens assembly  200  attached to primary lens assembly  100 , with auxiliary lens assembly  200  in the lowered position.  
         [0069]      FIG. 23  discloses a sixth embodiment of auxiliary lens assembly  200 . In this embodiment, auxiliary extensions  208  do not incorporate keyseat  214 , rocker  220  or arm  230 . Retainers  232  are attached to the ends of brackets  210 . Compressible bushings  236  are contained in retainers  232 .  FIG. 24  discloses the preferred embodiment of the complimentary primary lens assembly  100 , which is the same as that of  FIG. 20 .  FIG. 24  illustrates the auxiliary lens assembly  200  partially combined with primary lens assembly  100 .  FIG. 25  illustrates the full engagement of auxiliary lens assembly  200  with primary lens assembly  100 . This combination demonstrates the compatibility of the primary lens assembly  100  of the present invention with alternative, non-rotatable auxiliary lens assemblies  200 .  
         [0070]     In a seventh preferred embodiment, one or both of primary lenses  106  are corrective lenses and auxiliary lenses  206  and are impact resistant and/or radiation resistant (i.e. welding lenses) or safety lenses.  
         [0071]     The preferred embodiments of primary frame  102  and auxiliary frame  202  illustrated surround the entire perimeter of primary lenses  106  and auxiliary lenses  206  respectively. Alternatively, primary frame  102  may only partially surround the perimeter of primary lenses  106 . Likewise, auxiliary frame  202  may only partially surround the entire perimeter of auxiliary lenses  206 . Such configurations are known in the industry as “open edge.” 
         [0072]     In another preferred embodiment, primary lenses  106  are attached directly to primary bridge  104 . In this embodiment, slotted extensions  108  are attached directly to primary lenses  106 . In another preferred embodiment, auxiliary lenses  206  are attached directly to auxiliary bridge  204 . In this embodiment, auxiliary extensions  208  are attached directly to auxiliary lenses  206 . Such configurations are known in the industry as “frameless.” 
         [0073]     The various embodiments disclosed herein which include magnetic attraction will be appreciated by one of ordinary skill in the art to involve a combination of magnet-to-magnet magnetic engagement, or magnet-to-magnetic material magnetic engagement. “Magnetic material” as used herein is defined as materials subject to attraction by magnetic force, thus being magnetically attractable.  
       Operation of the Preferred Embodiments  
       [0074]     The preferred embodiment is disclosed in  FIGS. 1-12 . In this embodiment, primary magnets  122  magnetically and physically engage auxiliary magnets  234  located in retainers  232 . The magnetic engagement provides sufficient force to secure and position auxiliary lens assembly  200  in connection with primary lens assembly  100 . In the preferred embodiment, front extension portions  110  are also made of magnetic material, providing additional magnetic attraction between auxiliary magnets  234  and front extension portions  110 . The magnetic force between the magnets and magnetic materials, however arranged between the slotted extensions  108  and retainers  232 , prevents unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 .  
         [0075]     Once attached to primary lens assembly  100 , auxiliary lens assembly  200  is rotatable to two alternative positions. In a first “lowered” position, auxiliary lenses  206  are substantially aligned with primary lenses  106 . This causes light to pass through both auxiliary lenses  206  and primary lenses  106  before reaching the eyes of the person wearing the device. In a second “raised” position, auxiliary lenses  206  are removed from alignment with primary lenses  106 . This causes light to pass only through primary lenses  106  before reaching the eyes of the person wearing the device.  
         [0076]     In  FIG. 1 , auxiliary lens assembly  200  is illustrated in the lowered position. In a preferred embodiment, primary lenses  106  are corrective lenses and auxiliary lenses  206  are light transmission reducing lenses, such as a polarizing, absorbing, refracting, photochromatic, or reflecting lens, or any combination thereof (e.g., sunglasses). If the wearer needs to see only through primary lens assembly  100 , he/she may optionally remove auxiliary lens assembly  200 , or rotate it to the raised position. A preference to rotate auxiliary lens assembly  200  to the raised position may occur, for example, when the eyeglass wearer drives his/her automobile from a brightly sunlit environment into a tunnel or parking garage, or needs to read a newspaper or mobile telephone display while outside. In these instances, the eyeglass wearer may not wish to manually disengage and store auxiliary lens assembly  200  at that moment, and flipping auxiliary lens assembly  200  up into the raised position is safer, and/or more convenient.  
         [0077]     As seen in  FIGS. 9 and 10 , in the raised position, auxiliary lens assembly  200  is positioned directly above primary lens assembly  100 . In the raised position, auxiliary lenses  206  are removed from alignment with primary lenses  106 . This causes light to pass only through primary lenses  106  before reaching the eyes of the person wearing the device, without the need to remove and store auxiliary lens assembly  200 . This is most useful when the need to have light pass only through primary lenses  106  is temporary.  
         [0078]     Referring to  FIGS. 6 and 7 , when auxiliary lens assembly  200  is in the lowered position, internal springs  226  (not shown) inside rockers  220  compress end caps  228  against end faces  214   b  of keyseats  214 , providing a spring force for retaining auxiliary lens assembly  200  in the lowered position. When auxiliary lens assembly  200  is moved into the raised position, internal springs  226  compress end caps  228  against tops  214 a of keyseats  214 , providing a spring force for retaining auxiliary lens assembly  200  in the raised position. In the preferred embodiment, the raised and lowered positions of auxiliary lens assembly  200  are 90° apart as determined by the angle between top  214   a  and end flat  214   b . It is possible to define raised and lowered positions that are other than 90° apart by altering the angle between tops  214   a  and end flats  214   b , or by providing an additional faceted surfaces on keyseats  214  against which end caps  228  may be compressed.  
         [0079]     Compression of internal springs  226  against tops  214   a  and end flats  214   b  discourages location of auxiliary lens assembly  200  in any intermediate angular position with respect to primary lens assembly  100 . Auxiliary lens assembly  200  is held securely in the raised and the lowered positions by the compressive force of internal springs  226 , against the flat surfaces. This urges auxiliary lens assembly  200  into the desired angular positions; snapping it into place in the lowered position, and in the raised position. It also serves to discourage mis-positioning due to movement other than intention rotation, such as running and jumping activities.  
         [0080]     As seen in  FIG. 17, 21 , and  24 , in the various embodiments disclosed, auxiliary lens assembly  200  may be attached to primary lens assembly  100  by lowering auxiliary lens assembly  200  onto primary lens assembly  100  such that retainers  232  slide into slots  130  respectively. This requires only alignment and downward movement. The various embodiments disclose, in part, various arrangements for generating magnetic force between slotted extensions  108  and retainers  232 . The magnetic force between the magnets and magnetic materials, however arranged, prevent unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 .  
         [0081]     As seen in  FIG. 3 , slotted extensions  108  have and a front extension portion  110  and a rear extension portion  120 . The space between front extension portion and rear extension portion  120  forms a slot  130  for accommodation of retainer  232 . When rotating auxiliary lens assembly  200  into the raised position, the force provided by compressed internal springs  226  against end caps  228  will urge retainers  232  to rotate with auxiliary frame  202  and auxiliary lens  206 . Front extension portions  110  and rear extension portions  120  transmit this rotational force to primary lens assembly  100 . The force required to compress internal springs  226  sufficiently to allow rotation of keyseats  214  within rocker  220  is less than the force required to cause disruptive movement of the entire primary lens assembly  100  attached to the face of the wearer. As a result, auxiliary lens assembly  200  is easily rotated into the raised or lowered positions, and conveniently snaps into position.  
         [0082]     In a second embodiment, illustrated in  FIG. 13 , retainers  232  are solid (have no magnets), and are made of magnetic material. Retainers  232  may be formed integrally from the ends of brackets  210 . In this embodiment, magnetic force secures primary magnets  122  to retainers  232  and prevents unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 .  
         [0083]     In a third embodiment, (illustrated in  FIG. 14 , rear extension portions  120  are solid (have no magnets), and are made of magnetic material. In this embodiment, magnetic force secures auxiliary magnets  122  to rear extension portions  120  and/or front extension portions  110  (which may also be made of magnetic material) and prevents unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 .  
         [0084]     In a fourth embodiment, illustrated in  FIGS. 15-18 , retainers  232  are directly connected to the ends of brackets  210 . This embodiment of auxiliary lens assembly  200  is generally known in the industry. In this embodiment, auxiliary lens assembly  200  is not rotatable relative to primary lens assembly  100 . This embodiment demonstrates the adaptability of the primary lens assembly  100  of the present invention for use with auxiliary lens assemblies  200  that are rotatable, and with those that are not.  
         [0085]     In a fifth embodiment, illustrated in  FIGS. 19 and 20 , no magnets are required in either the primary lens assembly  100  or auxiliary lens assembly  200 , and retainers  232  and slotted extensions need not be made of magnetic material. Retainers  232  have a hollow center. Compressible bushings  236  are located in retainers  232 , in substitution for magnets  234 . As shown in  FIGS. 21 and 22 , compressible bushings  236  are positionable in slots  130  in an interference fit. In this embodiment, interference between compressible bushings  236  and slots  130  prevents unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 , and permits rotation of auxiliary lens assembly  200  between the raised and lowered positions relative to the primary lens assembly  100 .  
         [0086]     In a sixth preferred embodiment, illustrated in  FIG. 23  no magnets are required in either the primary lens assembly  100  or auxiliary lens assembly  200 , and retainers  232  and slotted extensions  130  need not be made of magnetic material. Retainers  232  are directly connected to the ends of brackets  210 . Retainers  232  have a hollow center. Compressible bushings  236  are located in retainers  232 , in substitution for auxiliary magnets  234 . As shown in  FIGS. 24 and 25 , compressible bushings  236  are positionable in slots  130  in an interference fit. In this embodiment, interference between compressible bushings  236  and slots  130  prevents unintentional vertical displacement of auxiliary lens assembly  200  from primary lens assembly  100 . This embodiment combines elements disclosed in the fourth and fifth embodiments detailed above.  
         [0087]     In a seventh preferred embodiment, one or both of primary lenses  106  are corrective lenses and auxiliary lenses  206  and are impact resistant and/or radiation resistant (i.e.. welding lenses) safety lenses. This configuration permits the eyeglass wearer the convenience of utilizing generic safety lenses fitted to his or her prescription. Auxiliary lens assembly  200  and safety lenses  206  can be flipped up and out of the way when close visual inspection is required without the need for protection. By not having to remove a separate pair of safety glasses, they are not easily misplaced. Also, if safety lenses  206  are damaged, they can be replaced without having to replace the more expensive prescription lenses.  
         [0088]     It will be obvious to one of ordinary skill in the art that certain features disclosed in the above detailed embodiments are readily combinable with the features of the other embodiments disclosed herein, as shown for the purpose of example, and not by limitation, in the sixth preferred embodiment detailed above. It will also be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention.