the present invention is directed to an automatic cage lock that secures an animal cage within a cage and rack system with minimal effort by , or inconvenience to , its user by providing hands free locking while installing the cage into the cage and rack system while also providing easy removal of the cage with the use of , for example , a slight left movement of the thumb on a user &# 39 ; s left hand to disengage the lock while simultaneously grasping the cage with both hands . additionally , a visual indication of whether the cage is in the locked position is also provided . referring now to the drawings in detail , fig1 depicts an embodiment of an automatic cage lock 10 constructed in accordance with the present invention . the automatic cage lock 10 is comprised of a mounting bracket 14 and a lock assembly 30 . in an exemplary embodiment , the automatic cage lock 10 is molded of an autoclaveable material , however , the automatic cage lock 10 may also be manufactured in stainless steel or by an application of material design well known to one skilled in the art . the mounting bracket 14 is comprised of a base 16 and a support arm 20 which may be unitarily formed . the support arm 20 extends generally outwardly and away from the base 16 and is generally perpendicular thereto . the base 16 of the mounting bracket 14 is generally flat which allows the mounting bracket 14 to be mounted to a variety of surfaces . the support arm 20 of mounting bracket 14 has at least one docking tab 22 which is formed in parallel with support arm 20 . docking tab 22 has a generally angular surface which forms a docking channel 18 therein . the docking channel 18 allows the lock assembly 30 to be slidably mounted to the support arm 20 . the slideable mounting feature of automatic cage lock 10 allows the adjustment of the lock assembly 30 within the mounting bracket 14 to adjust the longitudinal length of the automatic cage lock 10 to fit various sized cages and configurations . the lock assembly 30 includes at least one mounting rail 32 . the mounting rail is generally angular shaped to provide slideable mounting to support arm 20 . the lock assembly has a locking aperture 56 formed therein . the locking aperture 56 may be generally circular ( although other shapes may be used as a matter of application specific design choice by one skilled in the art ) and provides a means for fixably securing the lock assembly 30 to the mounting bracket 14 . a plurality of engagement teeth 60 may be formed adjacent to locking aperture 56 to provide a secure mating between lock assembly 30 and mounting bracket 14 and to prevent sliding therebetween . a flexing lock member 42 and a visual indicator arm 52 may be unitarily formed in a generally u - shaped configuration . the u - shaped configuration of flexing lock member 42 and visual indicator arm 52 forms a separation channel 34 therebetween . the separation channel 34 allows flexing lock member 42 to move independently of visual indicator arm 52 . a locking finger 50 is disposed at the end of the flexing lock member 42 . the locking finger 50 has a locking plate 54 and a locking tab 44 formed thereon . the locking plate 54 is generally flat and is disposed on the locking finger in a configuration that is generally perpendicular to flexing lock member 42 . the locking plate 54 , due to its shape , which in an embodiment of the invention is flat and plate - like , prevents the cage from falling out of the cage and rack system after the cage is securely docked therein . the locking tab 44 , which protrudes from the end of the locking finger 50 , provides a secure means of securing the cage within the cage and rack system by engaging about the edge of the cage whereby preventing the locking finger 50 from becoming disengaged . the locking finger 50 has a member deflector 40 formed thereon which is generally flat and angular . the member deflector 40 , due to its shape , facilitates deflection of the flexing lock member 42 and the locking finger 50 out of the path of the cage as it is being inserted into the cage and rack system . the smooth angular shape of member deflector 40 also serves to minimize scratching from occurring to the side of the cage . in an embodiment of the invention , portions of one , all , or some combination of member deflector 40 , end block 46 and locking tab 44 may be formed of a lightweight , durable low wear , low friction plastic such as , for example , the material sold by e . i . du pont de nemours and co . under the trade name delrin ®. use of such a material in accordance with the invention tends to minimize squeaking sounds when a cage rubs against either deflector 40 , end block 46 or locking tab 44 . after the cage is fully inserted into the cage and rack system , the flexing lock member 42 springs back into its original position to securely lock the cage into place . the visual indicator arm 52 may have an indicator block 36 inserted therein . the indicator block 36 may be color - coded ( e . g ., yellow ) and is used to visually indicate whether a cage is securely docked in the cage and rack system or is at risk of falling out . the color - coded indicator block 36 provides a quick visual check which the user may conveniently employ to see whether the cage is securely docked in the cage and rack system . a securely docked cage is profoundly important to the health and well - being of the animal or animals contained therein . for example , a cage that is not properly docked may lack the proper ventilation or access to a water supply that is required for the survival of the animal . typically , cage and rack systems have ventilation systems and water supply systems that are only accessible to the rear of the cage when it is fully docked in the cage and rack system . therefore , an improperly docked cage could compromise the animal contained therein . the flexing lock member 42 containing the locking finger 50 has an end block 46 , that may be unitarily formed with an indicator shield 38 . the end block 46 and the indicator shield 38 may be unitarily formed and adjacent to the locking finger 50 . the end block 46 and indicator shield 38 are disposed generally parallel to the locking plate 54 and protrude outwardly from the locking finger 50 so as to cover the indicator block 36 when the flexing lock member 42 is in its original , or locked position . as the cage is being inserted into the cage and rack system , the member deflector moves the locking finger 50 away from the path of the cage . as the locking finger 50 is deflected away from the cage , the end block 46 and indicator shield 38 are deflected away as well . as the indicator shield 38 is deflected away from the cage , the indicator block 36 is exposed , thus providing a quick visual indication that the cage is not securely docked within the cage and rack system . in an embodiment of the invention , lock assembly 30 may have a length l of from about 2 to 3 and preferably 2 . 5 inches . in an embodiment of the invention , lock assembly 30 may have a width w from about 0 . 25 to 0 . 75 , preferably 0 . 5 inches . the relatively small footprint of lock assembly 30 facilitates easy viewing of a cage without the viewing being obscured by the lock assembly . of course , other dimensions may be used in accordance with the invention as a matter of application specific design choice . referring now to fig2 with continued reference to fig1 the lock assembly 30 is shown as constricted in accordance with an embodiment of the present invention . fig2 illustrates an indicator housing 48 formed at the end of the visual indicator arm 52 . the indicator housing 48 is formed to accept the indicator block 36 depicted previously in fig1 . the indicator housing 48 allows a variety of color - coded indicator blocks 36 to be inserted therein . the color - coded indicator blocks 36 may be used to indicate a variety of statuses . for example , different colors may be used to indicate different animals or , for example , different groupings of animals with respect to a study or experiment . fig2 further illustrates an end stop 58 formed at the end of the u - shaped configuration of flexing lock member 42 and visual indicator arm 52 . further referring to fig2 with continued reference to fig1 illustrates that the end stop 58 prevents the lock assembly 30 from advancing past a fixed point by end stop 58 coming into contact with the base 16 . referring now to fig3 the mounting bracket 14 will be discussed in further detail with continued reference to fig1 . the mounting bracket 14 is shown having a mounting aperture 24 . the mounting aperture 24 may be generally circular and , in an embodiment , the mounting aperture 24 is used to mount the mounting bracket 14 to a fixed surface using a fastening device such as , for example , a screw . the mounting bracket 14 may be comprised of the base 16 and the support arm 20 . the support arm 20 may have an adjusting aperture 28 formed therein . the adjusting aperture 28 is generally elongated which allows for a fastening device to be inserted therethrough . referring again to fig3 with continued reference to fig1 and 2 , the support arm 20 has a plurality of ratchet teeth 26 , which are used to matingly engage the engagement teeth 60 contained on lock assembly 30 . the ratchet teeth 26 and the engagement teeth 60 prevent the lock assembly 30 from sliding along the docking channel 18 when it is engaged therein , thus maintaining the lock 10 at a specific adjusted position when cages are being pushed into position . the support arm 20 is depicted as having two docking tabs 22 which form a docking channel 18 therebetween . the docking tab 22 has a rail guide 12 which is generally angularly shaped to slidably accept the mounting rail 32 of lock assembly 30 . the angular shape of rail guide 12 serves to minimize the occurrence of mounting rail 32 of lock assembly 30 slipping out of , or being disengaged from , the docking channel 18 . the angular shape of rail guide 12 serves to minimize the occurrence of the mounting rail 32 slipping out of docking channel 18 while also providing slideable moveability along docking channel 18 . this facilitates a longitudinal adjustment of lock assembly 30 to fit customized cages and sizes within the cage and rack system . now referring to fig4 with continued reference to fig3 a perspective view of mounting bracket 14 is illustrated depicting a mounting aperture 24 . in an embodiment of the invention , a plurality of mounting apertures 24 are employed , thus allowing the mounting bracket 14 to be securely mounted to a surface using a type of fastening device such as a screw ( s ). in another embodiment , one of the mounting apertures 24 may be replaced with a solid peg . the solid peg is inserted into a pre - drilled hole in the cage and rack system and the second mounting aperture 24 secures mounting bracket 14 to the cage and rack system using a fastening device such as , for example , a screw or a bolt . this embodiment including the peg provides for a fixed and quick mounting of the mounting bracket 14 . referring now to fig5 with continued reference to fig1 an automatic cage lock 10 is shown having a fastening member 62 which is inserted in adjusting aperture 28 . the fastening member 62 may be used to provide a fixed and secure connection between the mounting bracket 14 and the lock assembly 30 . the fastening member 62 may be loosened to slidably adjust the longitudinal size of automatic cage lock 10 to fit custom cage sizes . the fastening member 62 may then be tightened to provide a secure connection by compressing the engagement teeth 26 after the automatic cage lock 10 has been adjusted to the desired longitudinal size . referring now to fig6 a cage and rack system 70 is depicted having a plurality of cage bins 72 contained therein . the automatic cage lock 10 is shown installed on the cage and rack system 70 , and the automatic cage lock 10 is depicted securing a cage 66 within the cage bin 72 . in fig7 with continued reference to fig6 the automatic cage lock 10 is fixably mounted to cage and rack system 70 and is further shown securely holding cage 66 in a docked position within the cage and rack system 70 . with reference to fig8 a user uses his thumb 100 to easily move the member deflector 40 in direction a , thus revealing indicator block 36 , and providing clearance for the removal of cage 90 . as can be seen from fig8 member deflector 40 would also be deflected in direction a during insertion of cage 90 . with reference to fig9 there is shown a cage 90 being secured by automatic cage lock 10 as described above . it will thus be seen that the objects set forth above , and those made apparent from the preceding description , are efficiently attained and , because certain changes may be made in the above construction without departing from the spirit and scope of the invention , it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense . it is also to be understood that the following claims are intended to cover all the generic and specific features of the invention herein described , and all statements of the scope of the invention which , as a matter of language , might be said to fall therebetween .