in the drawings and indicated generally by the reference numeral 10 is a collar according to the present invention . the collar 10 comprises a closure connector 20 and an elongated , flexible belt 12 having both a free end 16 and distal therefrom a thickened knob 13 . the connector 20 includes an open - ended , elongated frame and an arm 28 pivotally connected thereto by a shaft 30 rotatably mounted within holes 31 , 32 which are disposed proximate with the frame &# 39 ; s open end and formed in opposing sides 22 , 23 ( fig3 , 4 and 11 ). spaced apart from each other by a distance which is preferably slightly greater than the transverse width of the belt 12 , the sides 22 , 23 , together with the frame &# 39 ; s base define a “ u ”- shaped channel . distal from said open end , the channel is spanned by a narrow bar 24 atop the sides 22 , 23 and terminates in a wall 25 in which a pair of elongated slots 26 , 27 , disposed with their longitudinal axes oriented perpendicularly to said sides , are formed ( fig8 through 11 ). the distance between the elongated edges of the slot 26 , which is located in close proximity to the bar 24 , is preferably just wide enough to allow every part of the belt 12 except for the knob 13 to be passed through the slot 26 ( fig8 and 10 ). positioned within the frame prior to use , the knob 13 not only abuts both elongated edges of the slot 26 but also fits just beneath the lower surface of the top bar 24 ( fig1 ). holding the knob 13 securely against the slot 26 is a metal “ d ”- shaped ring 15 which is received by holes 34 , 35 formed in the frame and a hole 14 , alignable therewith , formed in the knob ( fig1 and 11 ). also held in place with the use of holes formed near the upper edges of the sides 22 , 23 are the ends of the shaft 30 which protrude from the arm 28 . a semi “ s ”- shaped structure in longitudinal cross - section , the arm 28 defines both a foot 29 and a handle 44 ( fig3 , 10 and 11 ). curving away from the arm &# 39 ; s elongated mid - section , the foot 29 and the handle 44 extend perpendicularly thereto , but in opposite directions and spaced apart from each other . with the shaft &# 39 ; s ends engaging the holes 31 , 32 , which are formed in the frame proximate with its open end , the arm itself is held in such a way that it can rotated into a position in which both the arm &# 39 ; s mid - section and the foot 29 are nested between the sides 22 , 23 ( fig4 through 6 ). moreover , the spacing between the frame &# 39 ; s base and the shaft 30 , when its ends are so engaged , is such that the foot 29 can clear the base by a distance which is slightly less than the thickness of the belt 12 ( fig1 ). in the preferred embodiment , the foot &# 39 ; s contact surface 40 clears a section of the base which defines a shallow recess 41 by said distance ( fig1 and 11 ). unlike the handle 44 which is tapered and narrower towards its tip , both the foot 29 and the arm &# 39 ; s elongated mid - section preferably have the same transverse span throughout their respective lengths , said transverse span measuring slightly less than that of the spacing between the sides 22 , 23 ( fig3 , 4 and 9 ). cutouts 42 , 43 formed in the sides 22 , 23 are situated proximate with the tip of the handle 44 , the only portion of the arm 28 which protrudes outwardly from the upper edges of the frame when the arm is otherwise fully nested within its “ u ”- shaped channel ( fig4 , 5 and 10 ). preferably molded from a hard , tough plastic material , the connector 20 , including its frame and arm 28 , can also be fabricated from a metal ; but the material of choice is an abs plastic , such as abs - pa757 , a product manufactured by the chimei corporation of taiwan . while the belt 12 can be fabricated from conventional fabric , leather , or a plastic material , it is preferably molded , using silicon rubber or a like rubbery , generally transparent substance . not only does molding with such a substance allow one to form the belt 12 as a single piece in which the thickened knob 13 with its hole 14 is an integral part of the belt , but also a phosphorescent additive can be incorporated into the mold , giving the finished belt luminescent properties . in addition , ornamental designs can be readily imprinted on the belt 12 during the molding process ( fig2 ). a suitable silicon rubber is available commercially from hongda new material co ., ltd ., china and is known as this company &# 39 ; s product no . 7861wjl . when molded , this silicon rubber , with a durometer reading of 65 ± 5 a in the preferred embodiment , has been formed into belts having both smooth and design finishes . very flexible and slightly elastic in character , a belt 12 fabricated of this material gives a slick , rubbery feeling when touched and is generally non - irritating to the skin and hair of animals wearing such a belt . moreover , cast as a mixture with a suitable phosphorescent additive , the preferred silicon rubber yields a belt 12 which can be seen in the dark . its luminescent properties are especially pronounced when coarse particles of a substance known as luminova ® g - 300 m or , alternately , luminova ® g - 300 l , are incorporated into the mold . manufactured by nemoto & amp ; co ., ltd ., of tokyo , japan , this material , as tests of its luminance have revealed , is not only up to ten times brighter than are conventional zinc sulfide - based phosphorescent pigments , but also the length of its afterglow is longer than theirs by an order of magnitude . based on strontium oxide aluminate chemistry , luminova ® g - 300 m , similar to alumina in hardness , has sharp - edged , needle - like particles which typically range in size from 10 to 40 micrometers . the percentage by weight of these particles in said silicon rubber mixture is preferably about 18 percent but can range between 5 and 30 percent and still give the belt 12 both pronounced luminescent properties and adequate tensile strength to restrain a typical dog . tested for tensile strength , a collar 20 having a belt 12 molded out of the preferred silicon rubber / phosphorescent additive mixture , with the belt measuring 1 inch wide , ⅛th inch thick , and about 18 inches long , was found to have a tension breaking strength of approximately 130 pounds of force . of six specimens tested , only four of them actually broke when their respective belts 12 were stretched to the full limit of the test frame ; and none of these breakages occurred because of a failure of the connector 20 . at the outset of the collar &# 39 ; s assembly , the arm 28 is rotatably mounted on the connector &# 39 ; s frame by spreading its sides 22 , 23 apart slightly to accommodate the ends of the shaft 30 , so that they can be rotatably received within holes 31 , 32 . the belt &# 39 ; s free end 16 is then inserted beneath the connector &# 39 ; s top bar 24 and threaded through its upper slot 26 until the thickened knob 13 is brought into contact with the upper slot &# 39 ; s elongated edges . after that , the “ d ”- shaped ring 15 is installed by first positioning the thickened knob 13 in such a way that it not only abuts the slot 26 but also the knob &# 39 ; s hole 14 is aligned with paired holes 34 , 35 formed in the frame &# 39 ; s sides 22 , 23 . the “ d ”- shaped ring 15 itself is then simultaneously inserted into the paired holes 34 , 35 and pressed into the thickened knob &# 39 ; s hole 14 , thereby completing the collar &# 39 ; s assembly . fitting the collar 10 onto a dog entails encircling his neck with the belt 12 and then positioning an end portion thereof disposed distal from the thickened knob 13 within the connector 20 . properly positioned , the end portion passes under the foot 29 and extends from the frame &# 39 ; s open end to the lower slot 27 , with the belt &# 39 ; s free end 16 protruding outwardly therefrom ( fig1 ). thus situated , the free end 16 remains virtually hidden from view between the belt &# 39 ; s outer layer 18 and the animal &# 39 ; s neck ( fig5 , 6 and 10 ). once the belt has been adjusted so as to provide a comfortable fit about the dog &# 39 ; s neck , one can then activate the collar &# 39 ; s closure mechanism by simply rotating the arm 28 downwardly into the connector &# 39 ; s frame until the foot 29 pinches the belt 12 against the frame &# 39 ; s base . in the preferred embodiment , the portion of the belt so pinched is sandwiched between the foot &# 39 ; s contact surface 40 and the shallow recess 41 ( fig1 and 11 ). roughened by knurling or the like on their respective mating surfaces , the foot 29 and the shallow recess 41 engage the belt 12 in such a way that a dog , by pulling on a collar 10 fitted about his neck , tends to draw the end of the arm 28 distal from the foot further into the “ u ”- shaped channel . in the process , the contact surface 40 is tipped upwardly towards the frame &# 39 ; s open end , thereby creating a small gap . simultaneously , as the dog subsequently releases his pull , the rubbery belt 12 springs back , filling this gap , and forms a wedge between the foot 29 and the recess 41 . this wedge then prevents the arm 28 from automatically returning to the position it assumed earlier , prior to the dog &# 39 ; s pulling action , and in effect provides the collar 10 with a self - clamping closure mechanism . to remove the collar 10 , one deactivates its closure mechanism by grasping the handle 44 and rotating the arm 28 upwardly until the belt 12 is freed and can be slid out of the connector &# 39 ; s open end . a tool such as a screwdriver &# 39 ; s blade ( not shown ) can be inserted through the cutouts 42 , 43 and beneath the arm 28 and has been found to be useful , even necessary , for unlocking the connector 20 once the self - clamping closure mechanism is engaged .