fig1 is a perspective view of the cervical restraint collar as it is applied to the neck of a bird . as can be seen , the neck of this particular bird assumes an “ s ” shape when relaxed within the collar . however , the neck can be straightened to some extent and yet the bird , with its beak , still cannot reach critical areas of the restraint collar to defeat its purpose and that is to act as a restraint . fig2 shows the greater curvature 1 as forming the outermost boundary of a sphere . the ridge 2 b is confluent with the greater curvature 1 of the sphere . the ridge 2 a is internal to ridge 2 b . there is a female receptacle 3 a of the locking mechanism is located on the widened section of ridge 2 a . the male fastener 3 b of the locking mechanism is located on the internal side of ridge 2 b in the position directly opposed to the female receptacle . a sphere of fig5 is formed when two diametrically aligned hemispheres are guided together by sliding ridge 2 a of one hemisphere along ridge 2 b of the opposite hemisphere with enough force to cause ridge 2 a to ride over fastener 3 b and enable fastener 3 b to engage the receptacle 3 a . this secures the two hemispheres together while reinforcing and stabilizing the seam 5 . once the two hemispheres are engaged , the seam 5 between the two halves of the completed sphere is tight and smooth . this seam follows or is aligned with the head to tail or long axis of the bird &# 39 ; s body further making it difficult to get an effective purchase on the outer surface of the spherical collar to inflict damage to the collar itself . the two hemispheres are positioned with their concave surfaces or interiors opposed to one another with male fasteners and female receptacles aligned . both hemispheres are pushed together forcing the ridge of each hemisphere &# 39 ; s wall to slightly flex and ride along side the opposing ridge until each male fastener engages the opposing female receptacle . to separate the sphere into the two component hemispheres , a pressure is simultaneously applied to two opposing points on the seam 5 between the hemispheres . as the sphere &# 39 ; s outer curvature flexes and distorts , the male fastener is released from its counterpart female receptacle . the two halves are then separated by pulling in opposite directions . the collar &# 39 ; s two hemispheres can thus be repeatedly engaged and disengaged . this internal locking mechanism includes a fastener and receptacle having one or both portions composed of a semi - rigid material capable of flexing or slight distortion and having a memory to return to its original shape so as to secure the protruding fastener of one hemisphere in a slot , depression or void which serves as the receptacle of the opposing and aligned hemisphere . alternatively , one or more materials with the properties of a non permanent adhesive ( eg . velcro ™ or 3m post - it note ™ adhesive ) could engage within the sphere and effectively hold the hemispheres , one to the other , until a sufficient force is applied to separate the non permanent materials . it is the property of the internal locking mechanism being out of the reach of the bird so that internal locks allow all outer surfaces of the spherical collar as well as the borders to the two openings through which the bird &# 39 ; s neck passes to have smooth , curved surfaces which , when fitted properly , will discourage or prevent the bird &# 39 ; s beak or claws the opportunity to bite or grasp the locks and collar , respectively . the curved borders of the openings further diminish the risk of injury from narrow or sharp edges against the head , neck and torso of the bird . the thickness or thinness of the greater curvature wall 1 of the sphere influences both the weight and the flexibility of the whole sphere or each component hemisphere . all edges of each hemisphere are strengthened by increasing the thickness of the construction material . using a lightweight but durable material like plastic allows for the majority of the wall of a sphere to be thinner than the curved border 4 and ridges 2 a & amp ; 2 b of each hemisphere allowing for reduction in overall weight while maintaining strength and flexibility . in the context of this description of the cervical restraint collar , a minimum of two of the three dimensions a - b , of the horizontal directions and d - e , the diagonal directions , composing all collars will form a circle as shown in fig6 . it is in the center of this circle that a space or void ( shaded area 6 ) is created by the curved border 4 to allow for the bird &# 39 ; s neck to be enclosed 360 degrees . the radius of the circle as it moves through the third dimension ( as illustrated by line e - f in fig7 and 9 ) may increase or decrease in size forming one of many curved shapes widening at one or more positions above and below or at the center point . fig9 represents the shape of an approximate hour glass having two widened sections or curves with a narrowing in between . the upper section is shown as having a narrower diameter d ′- c ′ than the lower section d - c . the axis e - f represents a vertical axis while a - b represents the wider section of the hour glass . fig1 shows the proximity of four external screw fasteners . portal 7 allows a compatibly sized screw to pass through one hemisphere into a female portal 8 of the opposing hemisphere . the threaded screw shaft engages within the threaded female portal 8 on the opposing hemisphere to secure the two hemispheres together . the seam 5 is formed by the union of the two hemispheres . this fastening system may be applied to the spheres with or without an internal locking mechanism . fig1 shows a three - dimensional axis illustrating the three axis lines critical to the unique forms and function of the avian cervical restraint collar . special orientation is represented by three separate and distinct lines connecting a and b , c and d , and e and f . each line represents widths a - b , depth c - d , and height e - f , respectively . all three lines intersect at their midpoint with the exception of the object illustrated in fig9 . together , all lines indicate a volume in space not yet utilized for psittacine bird cervical restraints .
a unique lightweight spherical avian cervical restraint collar composed of two hemispheres joined together to have height , width , and depth is disclosed . the collar has properties that act both as a physical barrier and a means of limiting the bending motion of the bird &# 39 ; s neck , which properties are incorporated into one structure of reduced proportions and are provided simultaneously . the continuous smooth curvature of the outer circumference of the spherical collar and internal fastening mechanism further deters damage to or a removal of the invention by the bird .