Food shields, also sometimes called sneeze guards, are used in a variety of settings. Typically, a clear panel is suspended over a buffet, smorgasbord, salad bar, retail display, or other kind of food display to protect the food from falling debris or other contamination. One or more panels may also be placed between the displayed food and customers, such that the customers must reach under the food shield to have access to the food, and the opportunities for contamination are limited.
Various health and safety codes may specify the required position of the food shield in relation to the food display. Because food shields are used in many different locations, it is desirable that a food shield be easily adjustable, so that it can be adapted to different spaces and uses. Some prior food shields are described in U.S. Pat. No. 6,588,863 to Yatchak et al., issued Jul. 8, 2003 and titled “Sneeze Guards and Methods for Their Construction”, the entire disclosure of which is hereby incorporated herein by reference for all purposes. While the sneeze guards described in that patent have proven very useful, even more adjustability and configurability are desirable. Other prior food shields are described in co-pending U.S. patent application Ser. No. 12/687,039 of Padden et al., filed Jan. 13, 2010 and titled “Food Shield”, the entire disclosure of which is hereby incorporated herein by reference for all purposes.
Embodiments of the invention provide a food shield with extensive adjustability and configurability.
According to one aspect, an adjustable food shield comprises at least one post having a longitudinal axis defining a length, and a carrier coupled to the post. The carrier includes a carrier clamping mechanism that is loosenable to enable the carrier to be moved along at least a portion of the length of the post, and is also tightenable to fix the carrier at a certain location on the post. The adjustable food shield further comprises a link having a proximal end pivotally coupled to the carrier such that the link is rotatable with respect to the carrier about an axis that is defined by the pivotal coupling of the carrier and the link, the link also having a distal end, and an arm pivotally coupled to the distal end of the link and extending from the link such that the arm is rotatable with respect to the link about an axis defined by the pivotal coupling of the arm and the link. The adjustable food shield also includes a clear panel coupled to the arm, and the clear panel is movable to different positions by rotating the link, the arm, or both. In some embodiments, the axis defined by the pivotal coupling of the carrier and the link is transverse to the longitudinal axis of the post. In some embodiments, the carrier defines a passage through which the post passes, and the clamping mechanism comprises a nut that defines a passage thorough which the post passes and that threadably engages with the carrier, and a sleeve that also defines a passage through which the post passes and that engages the carrier and the nut such that the sleeve engages the post more tightly as the nut is turned in a first direction, and the sleeve engages the post less tightly as the nut is turned in a second direction opposite the first direction. The sleeve may include a wedge portion that converts relative motion of the carrier and the nut to a clamping motion of the sleeve against the post. In some embodiments, the adjustable food shield further comprises a link fixing mechanism that is actuatable to fix the link in relation to the carrier and is also actuatable to enable rotation of the link with respect to the carrier. The link fixing mechanism may include a knob with a threaded stud, the threaded stud passing through the link and engaging a threaded hole in the carrier. In some embodiments, the adjustable food shield further comprises detent features that define a set of preferred rotational positions of the link in relation to the carrier. The detent features may comprise a set of radial ribs on one of the carrier or the link, each of the radial ribs aligned substantially perpendicular to the axis about which the carrier and the link relatively rotate, and a set of radial slots on the other of the carrier or the link, the radial slots of a size and position to complementarily engage the radial ribs in the preferred rotational positions. In some embodiments, the adjustable food shield further comprises an arm fixing mechanism that is actuatable to fix the arm in relation to the link and is also actuatable to enable rotation of the arm with respect to the link. The arm fixing mechanism may include a knob with a threaded stud, the threaded stud passing through one of the link or the arm and engaging a threaded hole in the other of the link or the arm. In some embodiments, the adjustable food shield further comprises detent features that define a set of preferred rotational positions of the arm in relation to the link. The detent features may comprise a set of radial ribs on one of the link or the arm, each of the radial ribs aligned substantially perpendicular to the axis about which the link and the arm relatively rotate, and a set of radial slots on the other of the link or the arm, the radial slots of a size and position to complementarily engage the radial ribs in the preferred rotational positions. In some embodiments, the arm defines two holes through which threaded fasteners pass to couple the clear panel to the arm, and the adjustable food shield further comprises two caps, each cap having a shank and an enlarged head, wherein the clear panel is disposed between the heads and the arm and is drawn toward the arm by the threaded fasteners. Each cap shank may include a flattened portion that engages a flat-sided hole to prevent rotation of the caps by the threaded fasteners. The longitudinal axis of the post may be substantially vertical. The longitudinal axis of the post may be substantially horizontal.
In some embodiments, the post is a first post, the carrier is a first carrier, the link is a first link, and the arm is a first arm, and the adjustable food shield further comprises a second post displaced from the first; a second carrier coupled to the second post, the second carrier including a carrier clamping mechanism, wherein the carrier clamping mechanism is loosenable to enable the second carrier to be moved along at least a portion of the length of the second post, and the carrier clamping mechanism is also tightenable to fix the second carrier at a certain location on the second post; a second link having a proximal end pivotally coupled to the second carrier such that the second link is rotatable with respect to the second carrier about an axis that is defined by the pivotal coupling of the second carrier and the second link, the second link also having a distal end; and a second arm pivotally coupled to the distal end of the second link and extending from the second link such that the second arm is rotatable with respect to the second link about an axis defined by the pivotal coupling of the second arm and the second link; wherein the clear panel is also coupled to the second arm.
In some embodiments, the carrier is a first carrier, the link is a first link, the arm is a first arm, and the clear panel is a first panel, and the adjustable food shield further comprises a second carrier coupled to the post, the second carrier including a carrier clamping mechanism, wherein the carrier clamping mechanism is loosenable to enable the second carrier to be moved along at least a portion of the length of the post, and the carrier clamping mechanism is also tightenable to fix the second carrier at a certain location on the post; a second link having a proximal end pivotally coupled to the second carrier such that the second link is rotatable with respect to the second carrier about an axis that is defined by the pivotal coupling of the second carrier and the second link, the second link also having a distal end; a second arm pivotally coupled to the distal end of the second link and extending from the second link such that the second arm is rotatable with respect to the second link about an axis defined by the pivotal coupling of the second arm and the second link; and a second panel coupled to the second arm. In some embodiments, the first carrier and link are comprised in a first panel mounting assembly, and the second carrier and link are comprised in a second panel mounting assembly like the first, and the second carrier is inverted with respect to the first carrier. In some embodiments, the first carrier and link are comprised in a first panel mounting assembly, and the second carrier and link are comprised in a second panel mounting assembly like the first, and the axes of rotation of the two links are coincident. In some embodiments, the first carrier and link are comprised in a first panel mounting assembly, and the second carrier and link are comprised in a second panel mounting assembly like the first, and the axes of rotation of the two links intersect.
In some embodiments, the position of the clear panel can be adjusted without the use of tools.
According to another aspect, a method of protecting displayed food items comprises providing a food shield comprising at least one post having a longitudinal axis defining a length, and a carrier coupled to the post. The carrier includes a carrier clamping mechanism that is loosenable to enable the carrier to be moved along at least a portion of the length of the post, and is also tightenable to fix the carrier at a certain location on the post. The food shield further includes a link having a proximal end pivotally coupled to the carrier such that the link is rotatable with respect to the carrier about an axis that is defined by the pivotal coupling of the carrier and the link, the link also having a distal end, and an arm pivotally coupled to the distal end of the link and extending from the link such that the arm is rotatable with respect to the link about an axis defined by the pivotal coupling of the arm and the link; and a clear panel coupled to the arm such that the clear panel is movable to different positions by rotating the link, the arm, or both. The method further comprises rotating the link, the arm, or both to position the clear panel in a certain position such that the clear panel is between the displayed food items and a viewing location. In some embodiments, the method further comprises engaging a link fixing mechanism and an arm fixing mechanism to hold the clear panel in the certain angular position. The method may further comprise adjusting the position of the carrier on the post in conjunction with rotating the link, the arm, or both, to position the clear panel in a combination of a certain angular position and a certain translational location.
According to another aspect, a panel mounting assembly for mounting a panel in a food shield comprises a carrier that defines a passage having a longitudinal axis. The passage is of a shape and size for coupling to a post, and the carrier includes a carrier clamping mechanism that is loosenable to enable the carrier to be moved along at least a portion of the length of the post and is also tightenable to fix the carrier at a certain location on the post. The panel mounting assembly further includes a link having a proximal end pivotally coupled to the carrier such that the link is rotatable with respect to the carrier about an axis that is defined by the pivotal coupling of the carrier and the link, the link also having a distal end, and an arm pivotally coupled to the distal end of the link and extending from the link such that the arm is rotatable with respect to the link about an axis defined by the pivotal coupling of the arm and the link, the arm defining two holes for attaching a panel to the arm. In some embodiments, the axis defined by the pivotal coupling of the carrier and the link is transverse to the longitudinal axis of the passage in the carrier. In some embodiments, the panel mounting assembly is provided in combination with the post and the panel. In some embodiments, the panel mounting assembly further includes a link fixing mechanism that is actuatable to fix the link in relation to the carrier and is also actuatable to enable rotation of the link with respect to the carrier, and an arm fixing mechanism that is actuatable to fix the arm in relation to the link and is also actuatable to enable rotation of the arm with respect to the link. In some embodiments, the panel mounting assembly further includes a first set of detent features that define a set of preferred rotational positions of the link in relation to the carrier, and a second set of detent features that define a set of preferred rotational positions of the arm in relation to the link. The first set of detent features may comprise a set of radial ribs on one of the carrier or the link, each of the radial ribs aligned substantially perpendicular to the axis about which the carrier and the link relatively rotate, and the detent features may further comprise a set of radial slots on the other of the carrier or the link, the radial slots of a size and position to complementarily engage the radial ribs in the preferred rotational positions. The second set of detent features may comprise a set of radial ribs on one of the link or the arm, each of the radial ribs aligned substantially perpendicular to the axis about which the link and the arm relatively rotate, and the detent features may further comprise a set of radial slots on the other of the link or the arm, the radial slots of a size and position to complementarily engage the radial ribs in the preferred rotational positions. In some embodiments, the carrier comprises a flange to which the link couples, the flange being positioned to provide clearance for a second carrier of a second panel mounting assembly like the first to be nested with the panel mounting assembly with the axes of rotation of the links of the two panel mounting assemblies being coincident or intersecting.
According to another aspect, a panel mounting assembly for mounting a panel in a food shield comprises a carrier that defines a passage having a longitudinal axis. The passage is of a shape and size for coupling to a post, and the carrier includes a carrier clamping mechanism that is loosenable to enable the carrier to be moved along at least a portion of the length of the post, and is also tightenable to fix the carrier at a certain location on the post. The panel mounting assembly also includes an arm pivotally coupled to the carrier such that the arm is rotatable with respect to the carrier about an axis defined by the pivotal coupling of the arm and the carrier. The arm includes a set of detent features that are incompatible with detent features included on the carrier, and the arm defines two holes for attaching a panel to the arm. The panel mounting assembly further includes an intermediate member between the arm and the carrier. The intermediate member has a first side including detent features complementary to detent features on the arm, and a second side including detent features complementary to detent features on the carrier. In some embodiments, the panel mounting assembly further includes an arm fixing mechanism that is actuatable to fix the rotational position of the arm in relation to the carrier and is also actuatable to enable rotation of the arm with respect to the carrier.
Posts 102a-102c may be round metal tubes of sufficient strength to support panels 101a and 101b. For example, posts 102a-102c may be made of steel, aluminum, brass, or anther metal or alloy of metals, or may be made of a suitable nonmetallic material. Posts 102a-102c may be painted, plated, or include other surface finishes for decorative purposes, additional durability, corrosion resistance, or other purposes. Posts 102a-102c may be affixed to a base 103 by any suitable means, for example by bolts through flanges 104a-104c. In some embodiments, posts 102a-102c may be about ¾ inch to about 1.5 inches in diameter, and in some embodiments are nominally 1 inch in diameter. Posts other than circular in cross section may be used in some embodiments.
Panels 101a, 101b are operably coupled to posts 102a-102c by panel mounting assemblies 105a-105d. Panel mounting assemblies 105a-105d enable panels 101a and 101b to be fixed in any of a number of positions with respect to posts 102a-102c. In the exemplary configuration of
The arrangement of
The ends of panels 101a and 101b may encroach quite closely to posts 102a-102c, for example within 1/16 inch, ⅛ inch, ¼ inch, ½ inch, 1 inch, or another suitable distance. The panels may be of any suitable size, but in some embodiments may be about ⅛ to ⅜ inches in thickness, about 10-14 inches in width, and about 24-40 inches in length. Nearly any panel dimensions may be used, subject to the strength and stiffness of the panel material, the number and spacing of posts, and the available area for the food shield.
In some embodiments, the panels may reside between the posts, as illustrated in
A link 202 has a proximal end 203 and a distal end 204, and is pivotally coupled at proximal end 203 to carrier 201 such that link 202 (and other components mounted to it) is rotatable with respect to carrier 201 about an axis 205, which is defined by the pivotal coupling of carrier 201 and link 202 and is transverse to the longitudinal axis of post 102b. A knob 206 can be tightened to fix link 202 with respect to carrier 201, or may be loosened to allow rotation of link 202 with respect to carrier 201, for example to adjust food shield 101 into a different configuration. Preferably, link 202 can rotate through a full 360 degrees about axis 205. An arm 207 is pivotally coupled to distal end 204 of link 202, and can rotate with respect to link 202 about an axis 208. A second knob 209 may be tightened to fix arm 207 to link 202, or may be loosened to allow adjustment of the relative angular positions of arm 207 to link 202.
Panel 101a is coupled to arm 207, and thus is moved to different positions by the rotations of link 202, arm 207, or both. In the example of
Sleeve 302 is preferably made of a material that can withstand repeated compression and decompression, and that will avoid marring of post 102a. For example, sleeve 302 may be made of a polymer such a nylon, acetal, polytetrafluorethylene, or another suitable material or combination or blend of materials. Carrier 201 and nut 301 may be made of any suitable material, for example aluminum, zinc, steel, stainless steel, brass, or nonmetallic materials. In some embodiments, carrier 201 and nut 301 are made of die cast aluminum, with threads added by post machining processes. The various parts may be painted, plated, or otherwise coated, for example for decorative purposes, enhanced wear properties, or resistance to corrosion. The parts may be brushed, polished, or given another surface finish.
In the example shown, sleeve 302 includes an angled shape that cooperates with angled surfaces within carrier 201, nut 301, or both to enhance the compression against post 102a. In other embodiments, sleeve 302 may be made of an elastomer or other material that is distorted under pressure to compress against post 102a.
Carrier 201 includes a flange 303 that includes features for engaging link 202. For example, carrier 201 may include a round boss 304 that defines an axis of rotation for link 202 in relation to carrier 201. Boss 304 may be approximately cylindrical, but may also be tapered, for example to provide draft for facilitating casting or molding of carrier 201 or to facilitate assembly of the panel mounting assembly. Boss 304 may include a threaded hole 305. Link 202 may include a through hole 306 of a complementary shape and size to boss 304, so that link 202 may rotate about the axis defined by boss 304. A knob 206 may be used to fix link 202 and carrier 201. For example, knob 206 may include a threaded stud 307 that engages with threaded hole 305 in carrier 201, so that link 202 may be tightly clamped between knob 206 and carrier 201. Preferably, the height of boss 304 is less than the effective thickness of link 202, to facilitate the clamping effect of knob 206.
Carrier 201 and link 202 may also include detent features that define a set of preferred rotational positions of link 202 in relation to carrier 201. In the example illustrated, carrier 201 has a set of radial ribs 308 disposed around boss 304, each rib 308 oriented substantially orthogonal to the axis defined by boss 304. Link 202 includes a set of complementary slots 309, of a shape, size, and position to engage the radial ribs 308 in the preferred rotational positions. In one embodiment, 16 ribs and 16 slots are provided, angularly spaced 22.5 degrees apart. It will be recognized that more or fewer ribs and slots may be used, providing more closely spaced preferred rotational positions, or more widely spaced preferred rotational positions. The ribs and slots may also be interchanged, if desired, such that ribs 308 reside on link 202, and slots 309 reside on carrier 201.
A similar arrangement may be provided at distal end 204 of link 202, for coupling link 202 to arm 207. For example, link 202 may include a boss 310, and arm 207 may define a mating hole 311, such that boss 310 defines an axis of rotation of arm 207 with respect to link 202. A knob 209 may be used to fix arm 207 and link 202 together, in a manner similar to that described above for fixing link 202 and carrier 201 together. In the example shown, arm 207 includes a set of radial ribs 312, and link 202 defines a complementary set of radial slots 313, defining a set of preferred relative angular positions of arm 207 and link 202. Ribs 312 and slots 313 are an example of detent features.
Preferably, but not necessarily, the detent features defining preferred rotational positions of link 202 and carrier 201 and preferred rotational positions of arm 207 and link 202 define the same number of preferred angular positions, with the same angular spacing. This arrangement facilitates positioning panel 101a in nominally exact horizontal and vertical positions. Other kinds of detent features may be used, for example a sawtooth radial pattern of ridges and grooves, pins and holes, or other features. In some embodiments, the preferred angular positions need not be equally spaced. In other embodiments, the system may rely on friction between the mating surfaces of carrier 201, link 202, and arm 207 and the clamping force provided by knobs 206 and 209 to hold the panels in fixed positions. The mating surfaces may be textured or roughened to increase friction.
Preferably, nut 301 and knobs 206 and 209 are actuatable by hand, so that the position of the panel can be adjusted and fixed without the use of tools.
Using numbers of posts, panels, and panel mounting assemblies, a large variety of food shield configurations may be constructed. For example, an extended food shield having multiple aligned panels can be constructed by coupling adjacent panels to the same post, as illustrated in
A wide variety of other arrangements is possible, using panel mounting assemblies, posts, and panels in combinations, and placing the panel mounting assemblies in different configurations.
For example,
While the panels illustrated thus far have been substantially planar, this is not a requirement.
The panels may conveniently be used as shelves for displaying desserts and the like. The positions of the panels are adjustable as described above. Exemplary display stand 1500 illustrates the use of a single post 1502 to support one or more panels, the use of non-rectangular panels 1503a-1503c, and the ability of panel mounting assemblies 1501a-1501c to be placed in various rotational positions about the axis of post 1502.
Each panel mounting assembly 1603a-c includes a reducer 1609, which is an intermediate member that enables arm 1606 to couple to carrier 1604. Each arm 1606 and its associated panel can still be fixed in various rotational positions about an axis 1610. Reducer 1609 has detent features on both sides, complementary to the detent features on carrier 1604 on one side, and complementary to the detent features on arm 1606 on the other.
In other aspects, the operation of panel mounting assembly 1603a is similar to the operation of the panel mounting assemblies previously described. Knob 1607 includes a threaded stud that engages with a threaded hole in carrier 1604, to fix arm 1606 in position. Nut 1605 is actuatable to tighten or loosen carrier 1604 on post 1602, to enable adjustability of the position of panel mounting assembly 1603a on post 1602.
The invention has now been described in detail for the purposes of clarity and understanding. However, those skilled in the art will appreciate that certain changes and modifications may be practiced within the scope of the appended claims.
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