embodiments of the present invention will now be described hereinafter referring to accompanying drawings . fig1 through 8 show a first embodiment of the present invention . as illustrated in fig1 a collar comprises a male member a , a female member b and a belt c . one end of the belt c is run through a connecting hole 9 of the female member b and is folded back to fix it by means of stitching or the like . the other end of the belt is passed through two belt connecting holes 16 , 17 provided in the male member a and is folded back so as to be fixed by a fixing member d by adjusting a length of the belt , i . e . a diameter of the collar . by connecting the male member a with the female member b , the belt forms a loop to be used as a collar . the female member b shown in fig2 through 4 and the male member a in fig5 through 7 are made of an elastic material of synthetic resin such as polycarbonate . the female member b is formed of a flat hollow shape in rectangular section . at one end , there is formed an opening 1 to engage with the male member a in a hollow portion 101 , and at the other end thereof , there is formed a connecting section 2 which is provided with a long hole 9 for connecting the belt c . the hollow portion 101 is surrounded by long side walls 3 , 4 facing each other at upper and lower portions , short side walls 5 , 6 facing each other at right and left sides and an inner wall 7 on the side of the belt connecting section , and one side is opened by the opening 1 . at the central part of the long wall 4 adjacent to the inner wall 7 , there is provided an engaging concave section 8 which passes through the outside surface . in the male member a , there is formed a belt connecting section 12 on one side of a flat base 11 in the shape of a rectangular plate , and on the other side thereof , a pair of both - side guides 13 and an engaging piece 14 are protruded . the dimensions between both outer sides of the pair of both - side guides 13 and the height of the guides 13 are arranged so as not to be shaky when the flat base slides into the female member b along the hollow portion 101 . there is provided a gap between the upper surface of the engaging piece 14 and the upper long side wall 3 of the female member b , and the under surface of the engaging piece 14 is positioned so as to be slidable relative to the lower long side wall 4 of the female member b . an engaging convex portion 15 is further provided on the tip portion of the engaging piece 14 . as shown in fig7 the engaging convex portion 15 is gently inclined toward the inserting direction to the female member b and is abruptly inclined toward the pulling direction . when the male member a is connected with the female member b , the both - side guides 13 and the engaging piece 14 of the male member a are inserted from the opening 1 of the female member b so that the both - side guides 13 slide on the short side walls 5 , 6 in the hollow portion 101 of the female member b to guide for insertion . at this stage , the engaging convex portion 15 at the tip of the engaging piece 14 hits the long side wall 4 in the hollow portion 101 and the inserting operation is obstructed . however , since the opposite side of the engaging convex portion 15 is formed in a manner to have a gap relative to the long side wall 3 , the engaging piece 14 is bent by running onto the long side wall 3 to thereby enable insertion . when the base 11 of the male member a is inserted to come in contact with the opening 1 of the female member b , the engaging convex portion 15 is engaged with the engaging concave portion 8 bored in the long side wall 4 to complete an engaging action . as illustrated in fig8 the engaging convex portion 15 engaged with the engaging concave portion 8 is provided with an abrupt slanting surface in the pulling direction . accordingly , even if the force which is generated in an ordinary behavior of a cat with the collar is added in the pulling direction , the engaging convex portion 15 does not come off since there is provided an engaging force of the abrupt slanting surface of the engaging convex portion 15 with the engaging concave portion 8 . however , when the collar is caught by something and a strong force is added , for instance , by the violent action of a cat the pulling force surpasses the engaging force of the engaging convex portion 15 and the engaging concave portion 8 , and it bends the engaging piece 14 to loosen the engaging convex portion 15 from the engaging concave portion 8 . the connection of the male member a with the female member b is thereby released to loosen the loop of the collar so that the cat under an accidental situation can be released . fig9 through 15 illustrate a second embodiment of the present invention . as shown in fig9 a collar comprises a male member a , a female member b , a belt c and a fixing member d . one end of the belt c is run through a connecting hole 9 of the female member b and is folded back to fix it by means of stitching or the like . the other end of the belt is passed through two belt connecting holes 16 , 17 provided in the male member a and is folded back so as to be fixed by a fixing member d by adjusting a length of the belt , i . e . a diameter of the collar . by connecting the male member a with the female member b , the belt forms a loop to be used as a collar . the female member b shown in fig1 and 11 and the male member a shown in fig1 and 13 are made of an elastic material of synthetic resin such as polycarbonate . in the female member b , there is formed a connecting portion 2 provided with a long hole 9 for connecting the belt c on one side of a base 20 in the shape of a parallel flat rectangular plate , and on the other side of the base 20 , there are formed two flat plates 21 , 22 opposite to each other which constitute an external shape of a flat female member b . at the central portion between two of the flat plates 21 and 22 , there is formed a hollow portion 201 surrounded by the flat plates 21 , 22 which are vertically positioned opposite to each other , the side walls 23 , 24 which connect the flat plates 21 , 22 with the base 20 as an inner wall 7 , and one side which is opened by an opening 1 . the side walls 23 , 24 on the side of the hollow portion 201 are made smooth , however , on the outside of the side walls 23 , 23 , there are formed engaging convex portions 25 in groove 202 which lie between the flat plates 21 and 22 . as shown by a section in fig1 , the engaging convex portion 25 is gently inclined upwardly toward an inserting direction from the opening 1 , while it is abruptly inclined downwardly toward in the pulling direction to the inner wall 7 . the upper and lower sides of the engaging convex portion 25 lie between the flat plates 21 and 22 , and the engaging convex portion 25 and the flat plates 21 , 22 guide the engaging pieces 31 , 32 of the male member a , which will be described later , to engage with each other . the male member a is provided with a belt connecting portion 12 on one side of a flat base 11 , while on the other side , there are protruded a guide 30 at the central part with a pair of engaging pieces 31 , 32 on both sides . the lateral and vertical dimensions of the guide 30 are arranged not to be shaky when it slides into the female member b along the hollow portion . the dimensions of the engaging pieces 31 , 32 are arranged to smoothly engage with a groove 202 and not to be shaky when they slide into and engage with the portion of the flat plates 21 and 22 where the engaging convex portion 25 is caught in between . both outside surfaces of the engaging pieces 31 and 32 are made smooth in conformity with the shapes of the flat plates 21 , 22 , however , at the basic portion of the base 11 , the thickness in the lateral direction are made thin so that the engaging pieces 31 and 32 can be elastically changed easily . inside the tip portion of the engaging pieces 31 , 32 , there are formed engaging concave portions 33 , 34 which engage with the engaging convex portions 25 of the female member b . inside the tip portions of the engaging pieces 31 , 32 , there are also formed slanting surfaces in a manner to have the thickness of the tip thinner toward the tip from the midway of the slanting surfaces of the engaging concave portions 33 , 34 . when the male member a is connected with the female member b , the guide 30 and the pair of the engaging pieces 31 and 32 of the male member a are inserted from the side of the opening 1 of the female member so that the guide 30 slides on the flat plates 21 and 22 and the side walls 23 , 24 which connect the flat plates 21 and 22 in the hollow portion of the female member b to guide for insertion . at this stage , the tips of the pair of the engaging pieces 31 and 32 hit the side walls 23 and 24 in the hollow portion 201 and an inserting action is obstructed . however , since the slanting surface provided inside the tip portions of the engaging pieces 31 , 32 is arranged in a manner to make the thickness of the tip portion thinner toward the tip , with the gentle slanting surface which is provided outside the tip portion of the side walls 23 , 24 of the female member b , the engaging pieces 31 , 32 are bent by a gentle resistance of the slanting surface of the engaging pieces 31 , 32 to thereby enable insertion . when the base 11 of the male member a is inserted to come in contact with the opening 1 of the female member b , the engaging concave portion 33 , 34 of the male member a is engaged with the engaging convex portion 25 of the female member b to complete an engaging action . as illustrated in fig1 , the engaging concave portions 33 , 34 which engage with the engaging convex portions 25 are provided with an abruptly inclined surface in the pulling direction . accordingly , even the force which is generated in an ordinary behavior of a cat with the collar is added in the pulling direction , the engaging portion does not come off since there is provided an engaging force of the abruptly inclined surface of the convex portion 25 and the abruptly inclined surfaces of the engaging concave portions 33 , 34 . however , when the collar is caught by something and a strong force is added , for instance , by violent action of a cat , the pulling force surpasses the engaging force of the engaging convex portion 25 and the engaging concave portions 33 , 34 , and it bends the engaging pieces 31 , 32 to loose the engaging convex portion 25 from the engaging concave portions 33 and 34 . the male member a and the female member b are thus disconnected to release the loop of the collar so that the cat under an accidental situation can be released . the collar for a cat described in the above embodiments is simple in construction and easy to manufacture . since the female member is made flat , the male member to fit on the female member is also flat . consequently , the thickness of the connecting section where the male and female members are fitted with each other can be made substantially as thin as the thickness of the belt . by maintaining a firm state of fitting between the fitting hole and the guide portion , a sufficient space can be secured for the engaging pieces to elastically engage and disengage therein . the shapes of the engaging pieces of the male member and its engaging protrusion , and also a degree of elastic change at the time of engagement can thus be freely designed to obtain a desired engaging force . especially the collar for a cat described in the second embodiment of the present invention may be constructed in any shape since the engaging portion provided in the female member is formed in a concave portion which is opened outwardly . the engaging portion can be designed more freely than that of the first embodiment of the present invention , and a more accurate engaging force can be obtained . in the second embodiment of the present invention , the female member and the male member are engaged with each other by their slanting surfaces , and therefore , even if they are repeatedly engaged and disengaged , the shapes are not changed and a predetermined engaging force can be maintained over a long period of time . further , an engaging force can be easily set by arranging an angle of inclination relative to the direction the slanting surfaces slide and engage . the method of engaging the slanting surfaces may also be applied to the first embodiment of the present invention . although the present invention has been fully described by way of examples with reference to the accompanying drawings , it is to be noted that various changes and modifications will be apparent to those skilled in the art . therefore , unless otherwise such changes and modifications depart from the scope of the present invention , they should be construed as being included therein .
slip prohibiting engaging portions provided in a female member and a male member elastically fit with each other in the crossing direction relative to a sliding and fitting direction when the female member and the male member are slid and fitted with each other to give a predetermined resistance when the female member and male member are pulled out .