referring initially to fig1 of the drawings , it will be seen that a food shield , also commonly referred to in the food service industry as a “ sneeze guard ”, constructed in accordance with the present invention includes a transparent panel 13 , which may be formed from a framed or unframed planar sheet of clear acrylic material or safety or tempered glass . the transparent panel 13 is mounted on and supported by a locking assembly 20 on one lateral side thereof , and is mounted on and supported by a non - locking assembly 22 on the opposite lateral side thereof . the locking , panel support assembly 20 and the non - locking , panel support assembly 22 are mounted to respective vertical support posts 14 , with the transparent panel 13 essentially extending horizontally between the support posts 14 . the locking and non - locking assemblies 20 , 22 of the food shield are positioned at a desired height along the axial length of the support posts 14 , and permit the transparent panel 13 to be adjusted angularly in a desired position , so as to best serve the requirements of the restaurant or food service establishment in which it is located in preventing contamination of food displayed on one side of the transparent panel 13 from airborne bacteria transmitted by customers on the opposite side of the panel , and yet not unduly restrict the customers &# 39 ; access to the food , if so desired . as can be seen from fig2 of the drawings , each of the locking assembly 20 and non - locking assembly 22 includes a panel support bracket 3 , 8 , respectively , on which the transparent panel 13 is mounted . more specifically , a pair of holes is formed through the thickness of the transparent panel 13 on each lateral side portion of the panel . the holes receive threaded studs 12 extending outwardly from each of the brackets 3 , 8 . threaded knobs 11 are screwed onto the ends of the studs 12 that extend through the transparent panel 13 to secure the panel to the support brackets 3 , 8 of the locking and non - locking assemblies 20 , 22 . fig3 - 9 of the drawings show the components of the food shield of the present invention in greater detail . the locking assembly 20 includes a pull collar 5 , a locking chamber barrel 1 , and a panel support bracket 3 interposed between the pull collar 5 and the locking chamber barrel 1 . the panel support bracket 3 includes a planar main body 24 , and two spaced apart support flanges 26 extending perpendicularly outwardly from a surface of one side of the main body 24 . each flange 26 includes a threaded bore formed in its upper surface . each threaded bore receives a threaded stud 12 , which is used for securing the transparent panel 13 to the support bracket 3 of the locking assembly 20 . the non - locking assembly 22 also includes a panel support bracket 8 , and a non - locking chamber barrel 9 . the panel support bracket 8 of the non - locking assembly 22 is similar in shape and structure to the shape and structure of the support bracket 3 of the locking assembly 20 , and also includes a planar main body 24 and two spaced apart support flanges 26 extending perpendicularly outwardly from a surface of one side of the planar main body 24 , so that the flanges 26 of the panel support bracket 8 of the non - locking assembly 22 face the flanges 26 of the panel support bracket 3 of the locking assembly 20 . each of the locking chamber barrel 1 and the non - locking chamber barrel 9 of the locking assembly 20 and the non - locking assembly 22 , respectively , is generally cylindrical in shape , and each includes a first bore 28 passing diametrically through the thickness of the barrel . the first bore 28 is dimensioned to receive one of the vertical support posts 14 so that the locking chamber barrel 1 and the non - locking chamber barrel 9 may be mounted on a respective support post 14 at a desired position along the axial length thereof . also , each of the locking chamber barrel 1 and the non - locking chamber barrel 9 respectively of the locking assembly 20 and the non - locking assembly 22 has a second bore 30 formed therein which radially extends from the exterior surface of the barrel into the first , larger diameter bore 28 which receives the support post 14 . this second , smaller diameter bore 30 , which is disposed perpendicularly to the first bore 28 , is threaded and receives a threaded stud 10 . a knob 11 is threadingly secured to an exposed axial free end of each of the threaded studs 10 . the knobs 11 may be turned to advance the threaded studs 10 into the barrels 1 , 9 and so that the other axial end of each stud 10 extends into the support post bore 28 of each barrel . the vertical support posts 14 may include one or more holes 32 formed therein along their axial lengths . the barrels 1 , 9 of the locking and non - locking assemblies 20 , 22 may be positioned on their respective support posts 14 such that the second bores 30 formed in the barrels are in alignment with a selected hole 32 formed in the support posts 14 . the knobs 11 are then turned to advance the threaded studs 10 into a corresponding hole 32 formed in the support posts 14 to secure the locking and non - locking assemblies 20 , 22 of the food shield to their respective support posts 14 on which they are mounted . the locking , panel support assembly 20 of the food shield will now be described in greater detail , and reference should be had to fig4 , 6 and 7 of the drawings . here , it will be seen that the chamber barrel 1 of the locking assembly 20 includes a flat end face 34 . a plurality of closely spaced detents or openings 36 is formed circumferentially in the end face 34 near the peripheral edge of the end face . there is also a threaded central opening 38 formed in the end face 34 of the chamber barrel 1 . the pull collar 5 of the locking assembly 20 is shaped with a knob - like axial end 40 so that it is easily graspable by a user of the food shield . the pull collar 5 also includes a flat end face 42 axially opposite the knob - like end 40 . mounted on the flat end face 42 of the pull collar 5 is a locating pin 2 which extends outwardly therefrom . also , the pull collar 5 has a central bore 44 extending axially therethrough . the panel support bracket 3 is sandwiched between the flat end face 34 of the chamber barrel 1 and the flat end face 42 of the pull collar 5 . the main body 24 of the panel support bracket 3 has two openings formed through its thickness . a first opening 46 receives a relatively long shoulder bolt 6 to secure the components of the locking assembly 20 together . a smaller diameter second opening 48 , formed through the thickness of the bracket 3 , allows the free end of the locating pin 2 that is mounted on the pull collar 5 to pass freely therethrough . the unthreaded shank of the long shoulder bolt 6 passes centrally through a compression spring 4 , through the central bore 44 of the pull collar 5 and through the larger , first opening 46 formed in the main body 24 of the panel support bracket 3 . the threaded free end portion of the long shoulder bolt 6 is received by the threaded central opening 38 formed in the end face 34 of the chamber barrel 1 of the locking assembly 20 . the shoulder bolt 6 secures the pull collar 5 , panel support bracket 3 and locking chamber barrel 1 of the locking assembly 20 together , but allows the pull collar 5 to move reciprocatingly axially on the unthreaded shank of the shoulder bolt 6 against the bias of the compression spring 4 , which is held captive between the head of the shoulder bolt 6 and the pull collar 5 . the locking assembly 20 operates in the following manner . the locating pin 2 situated on the end face 34 of the pull collar 5 passes through the smaller diameter second opening 48 formed through the main body 24 of the panel support bracket 3 , and the free end of the locating pin 2 is received in one of the detents or openings 36 formed circumferentially in the flat end face 34 of the locking chamber barrel 1 . to adjust the angular disposition of the transparent panel 13 of the food shield with respect to the vertical support posts 14 between which the food shield is mounted , the user would grasp the knob end 40 of the pull collar 5 and pull outwardly on the collar in an axial direction away from the chamber barrel 1 against the bias of the compression spring 4 . the shank of the long shoulder bolt 6 is particularly dimensioned in axial length so that the pull collar 5 can only move axially a predetermined distance thereon so as not to permit the locating pin 2 from becoming disassociated with the panel support bracket 3 . the locating pin 2 , mounted on the flat end face 42 of the pull collar 5 , freely passes through the smaller diameter second opening 48 formed in the main body 24 of the panel support bracket 3 and moves reciprocatingly therein with axial movement of the pull collar 5 . thus , when the user pulls on the pull collar 5 , the free end of the locating pin 2 mounted thereon becomes dislodged from a particular opening or detent 36 formed in the flat end face 34 of the locking chamber barrel 1 , and yet remains within the locating pin opening 48 formed in the panel support bracket 3 . now , the user may adjust the angular disposition of the transparent panel 13 by rotating it relative to the vertical support posts 14 between which the transparent panel 13 of the food shield of the present invention is mounted . when the transparent panel 13 is moved to a desired position , the user releases the pull collar 5 so that the pull collar , biased by the compression spring 4 , will move axially on the shank of the long shoulder bolt 6 toward the chamber barrel 1 , and the free end of the locating pin 2 will be received in an aligned opening or detent 36 formed in the flat end face 34 of the chamber barrel 1 . the engagement of the locating pin 2 with a particular opening or detent 36 in the chamber barrel 1 will lock the transparent panel 13 in a desired angular disposition between the vertical support posts 14 . this adjustment is accomplished from only one side of the transparent panel 13 . the threaded end portion of the shoulder bolt 6 has a reduced diameter than that of the unthreaded shank . the reduced diameter threaded end portion of the bolt 6 defines a shoulder with the larger diameter shank . the opening 46 formed in the panel support bracket 3 which receives the bolt 6 is dimensioned so that the support bracket 3 is retained on the bolt 6 but may rotate on the shank thereof . the bolt 6 is screwed into the central opening 38 formed in the chamber barrel 1 until the shoulder abuts against a recessed portion of the end face 34 of the barrel surrounding the central opening 38 . the non - locking , panel support assembly 22 mounted on the other vertical support post 14 and situated on the other lateral side of the transparent panel 13 of the food shield , opposite to where the locking assembly 20 and support post 14 on which the locking assembly is mounted , will now be described , and reference should be had to fig5 , 8 and 9 in this regard . the non - locking assembly 22 includes a non - locking chamber barrel 9 and a panel support bracket 8 , as mentioned previously . the non - locking chamber barrel 9 has generally the same cylindrical shape as the locking chamber barrel 1 of the locking assembly 20 , as described previously , with a support post bore 28 formed diametrically through the side of the chamber barrel 9 , and a smaller , threaded stud bore 30 disposed perpendicularly to the support post bore 28 and formed radially through the barrel 9 from the side wall thereof and into the support post bore 28 . a threaded stud 10 is received by the stud bore 30 to extend into the support post bore 28 and be received by a hole 32 formed in the vertical support post 14 on which the non - locking chamber barrel 9 is mounted . the exposed , free end of the threaded stud 10 is capped with a threaded knob 11 for grasping by the user of the food shield so as to advance the threaded stud 10 into the chamber barrel 9 and the hole 32 in the support post 14 on which the non - locking assembly 22 is mounted . the structure of the stud 10 , knob 11 , support post bore 28 and stud bore 30 on the non - locking chamber barrel 9 of the non - locking , panel support assembly 22 is preferably the same as that of the components 10 , 11 , 28 , 30 on the locking chamber barrel 1 of the locking , panel support assembly 20 . the panel support bracket 8 of the non - locking assembly 22 is generally the same as the panel support bracket 3 of the locking assembly 20 , with a planar main body 24 and spaced apart flanges 26 extending perpendicularly from a side surface of the bracket 8 and on which one lateral side of the transparent panel 13 rests . as also mentioned previously , the flanges 26 on the support bracket 8 of the non - locking assembly 22 face the flanges 26 on the support bracket 3 of the locking assembly 20 . there is an opening 46 formed through the thickness of the main body 24 of the panel support bracket 8 of the non - locking assembly 22 . through this opening 46 is received a shoulder bolt 7 , which is shorter in axial length than the shoulder bolt 6 used in the locking assembly 20 . the shoulder bolt 7 has a threaded free end having a reduced diameter than that of the non - threaded shank of the bolt 7 so as to define with the shank a shoulder . the diameter of the opening 46 formed through the thickness of the panel support bracket 8 is such that it may receive the unthreaded shank of the shoulder bolt 7 and be rotatable thereon . the threaded free end of the shoulder bolt 7 is received by a threaded central opening 38 formed in a flat end face 34 of the chamber barrel 9 of the non - locking assembly 22 and secured thereto , with the shoulder tightly abutting a recessed portion of the end face 34 of the chamber barrel 9 which surrounds the central opening 38 so that the panel support bracket 8 is secured to the flat end face 34 of the chamber barrel 9 but rotatable thereon to allow angular movement of the transparent panel 13 of the food shield mounted on the support bracket 8 . on the non - locking assembly 22 , the panel support bracket 8 preferably does not include a locating pin bore 48 , and the flat end face 34 of the non - locking chamber barrel 9 preferably does not include the detents or openings 36 found on the chamber barrel 1 of the locking assembly 20 for receiving a locating pin 2 . furthermore , there is no pull collar 5 or locating pin 2 on the non - locking assembly 22 . of course , the panel support bracket 8 and chamber barrel 9 of the non - locking assembly 22 could be made with the same structure as the bracket 3 and barrel 1 of the locking assembly 20 by including a locating pin bore 48 and a plurality of detents or openings 36 respectively formed therein , as long as a locating pin 2 is not used . accordingly , when the collar 5 of the locking assembly 20 is pulled outwardly from the panel support bracket 3 to disengage the locating pin 2 from an opening or detent 36 formed in the end face 34 of the locking chamber barrel 1 , in order to adjust the angular disposition of the transparent panel 13 , the panel support bracket 8 of the non - locking assembly 22 , attached to the transparent panel 13 on its opposite lateral side , will freely rotate with the panel on the non - locking chamber barrel 9 . when the locating pin 2 is received in an aligned opening or detent 36 formed in the chamber barrel 1 of the locking assembly 20 , to secure the transparent panel 13 in a desired angular disposition with respect to the vertical support posts 14 between which the food shield of the present invention is mounted , the panel support bracket 8 of the non - locking assembly 22 will also remain in this new position on the chamber barrel 9 of the non - locking assembly 22 , and will provide support to the transparent panel 13 on the lateral side of the transparent panel 13 opposite the lateral side where the locking assembly 20 is located . as described above , one of the advantages of the food shield of the present invention is that adjustment of the angular disposition of the transparent panel 13 may be effected from only one lateral side of the panel . there is no need with the food shield of the present invention to unlock the support post mechanisms on both sides of the transparent panel 13 simultaneously , as is required with conventional food shields . one person may easily adjust the angular disposition of the food shield of the present invention from only one side of the transparent panel 13 . also , the simplified structure of the locking assembly 20 of the food shield of the present invention , with its pull collar 5 and locating pin 2 that is selectively receivable in a detent or opening of the plurality of detents or openings 36 formed in the end face 34 of the chamber barrel 1 , makes it easier for an employee or owner of the food service establishment to adjust the angle of the transparent panel 13 . very little pulling force is required to be exerted on the pull collar 5 to disengage the locating pin 2 from one of the openings or detents 36 formed in the end face 34 of the chamber barrel 1 , against the bias of the compression spring 4 , and the compression spring 4 will bias the locating pin 2 into a desired opening or detent 36 in the chamber barrel 1 when the pull collar 5 is released . of course , it should be realized that two locking assemblies 20 may be used to support the lateral sides of the transparent panel 13 instead of one locking assembly 20 on one panel side and a non - locking assembly 22 on the other panel side , but then the adjustment of the angular disposition of the food shield would have to be made from both lateral sides of the transparent panel 13 . although illustrative embodiments of the present invention have been described herein with reference to the accompanying drawings , it is to be understood that the invention is not limited to those precise embodiments , and that various other changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention .
a food shield for use in a restaurant or food service institution includes a transparent panel , a locking , panel support assembly and a non - locking , panel support assembly . the locking , panel support assembly is mounted on a first vertical support member , and the non - locking , panel support assembly is mounted on a second vertical support member . a first lateral side portion of the transparent panel is affixed to the locking , panel support assembly , and an opposite second lateral side portion of the transparent panel is affixed to the second lateral side portion of the transparent panel . the transparent panel is adjustable in a plurality of angular dispositions , and is locked in one of the angular dispositions by the locking , panel support assembly , and is not locked in one of the angular dispositions by the non - locking panel support assembly .