now the present invention will be described in more detail with reference to fig1 to 11 of the accompanying drawings . fig1 is a schematic perspective view representing a buckle according to one embodiment of the present invention when it is in mated condition . fig2 is a perspective view representing the buckle of fig1 when it is in unmated condition . fig3 is an exploded perspective view representing a female section of the buckle of fig1 . as can be seen in fig1 to 3 , the buckle 40 in this embodiment comprises a male section 50 and a female section 60 . as is clearly shown in fig2 the male section 50 includes resilient latch portion 51 at the front end thereof for detachably mating with the female section 60 . the male section 50 further includes an engagement portion 52 at the rear end thereof for adjustably engagement with a fastening belt or band for a bag . on the other hand , the female section 60 includes a mating recess 61 at the front end thereof for detachably receiving the resilient latch portion 51 of the male section 50 . the female section 60 further includes an engagement portion 62 at the rear end thereof for fixedly engagement with a fastening belt or band for the bag . referring more particularly to fig3 the resilient latching portion 51 and the engagement portion 52 of the mating section 50 are formed as the separate components according to the present invention . each of the resilient latch portion 51 and the engagement portion 52 may be integrally molded from any suitable material , such as plastic . in more detail , the resilient latch portion 51 is provided with latch arms 51 a at the opposite sides and at the front end thereof . these latch arms 51 a are arranged so that they are inwardly biased toward each other . in addition , pivot shafts 51 b are provided at the opposite sides of a base of the resilient latch portion 51 . on the other hand , the engagement portion 52 is provided with forwardly extending side arms 52 a at the opposite sides thereof . in addition , an engagement rod 52 b and a base rod 52 c are formed to connect between the side arms 52 a . the base rod 52 c is provided with a tapered top surface 52 c ′ downwardly extending toward the engagement rod 52 b , and a corrugated bottom surface ( not shown in the figure ) for preventing any slippage of the belt . furthermore , pivot holes 52 d are formed in the side arms 52 a at the positions near the front end thereof these pivot holes 52 d are arranged to mate with the pivot shafts 51 b on the opposite sides of the base of the resilient latch portion 51 . the side arms 52 a of the engagement portion 52 can be resiliently biased outwardly to some degree at the front ends thereof . therefore , the engagement portion 52 can be assembled with the resilient latch portion 51 by inserting the pivot shafts 51 b into the pivot holes 52 d while biasing the front ends of the side arms 52 a slightly outwardly . fig2 represents the condition where the engagement portion 52 has been assembled with the resilient latch portion 51 . in this condition the engagement portion 52 can pivotally be moved freely relative to the resilient latch portion 51 about the pivot axis 51 b . also in this condition a through - hole 52 e is produced between the base of the resilient latch portion 51 and the engagement rod 52 b . in addition a through - hole 52 f is present between the engagement rod 52 b and the base rod 52 c . the female section 60 may be integrally molded from any suitable material such as plastic . as can be seen in fig2 the engagement portion 62 of the female section 60 includes an engagement rod 62 a , and a through - hole 62 b present in front of the engagement rod 62 a . the engagement portion 62 further includes latch windows 61 a formed at the both sides of the mating recess 61 . referring again to fig1 in order to connect the male section 50 with the female section 60 , the resilient latch portion 51 of the male section 50 is inserted into the mating recess 61 of the female section 60 while resiliently biasing the latch arms 51 a inwardly . then the outwardly curved portions of the latch arms 51 a become snapped into the latch windows 61 a . as the result the male section 50 and the female section 60 are securely locked and kept in place to each other . the female section 60 in this embodiment may have the same construction as that already described with reference to the prior art , and therefore , there is no need for further description of the female section 60 . now the description will be made in terms of the operation and the application of the buckle according to the embodiment as described above . fig4 is a schematic perspective view representing one application of the buckle 40 wherein it is used for a mountain - climbing bag . fig5 is an enlarged view representing a portion encircled by a circle “ a ” in fig4 . as is apparent in fig4 and 5 , the buckle 40 is used for the mountain - climbing bag 70 having an adjustable fastening belt 72 secured at one end to a bag body 71 and a fixed fastening belt 74 secured at one end to a cover 73 . the cover 73 functions to open and close an opening of the bag body 71 . the adjustable fastening belt 72 is engaged with the buckle 40 in the following manner . the free end of the adjustable fastening belt 72 is passed through the through - hole 52 e from back to front side , and then it is passed through the through - hole 52 f from front to back side . as the result the belt 72 is wound around the engagement rod 52 b . this makes the adjustable fastening belt 72 adjustably engaged with the male section 50 of the buckle 40 . in this connection , it is important to note that , as far as some pulling force is applied to one end of the adjustable fastening belt 72 in the backward direction relative to the engagement portion 52 and in a plane substantially same as that where the engagement portion 52 exists , the adjustable fastening belt 72 can be kept wound around the engagement rod 52 b , due to the interaction produced between the engagement rod 52 b and the end portion of the downwardly extending tapered top surface 52 c ′ and the corrugated bottom surface ( if present ) of the base rod 52 c . therefore there is no such condition occurred that the adjustable fastening belt 72 is gradually moved and finally the free end thereof becomes dropped off the engagement portion 52 , as in the case of the prior art buckle . on the other hand , the fixed fastening belt 74 is engaged with the buckle 40 in the following manner . one end of the fixed fastening belt 74 is passed through the through - hole 62 b from front to back side so that the belt 74 is wound around the engagement rod 62 a . thereafter , both ends of the belt 74 are secured to the cover 73 by a sewing process , for example . then the fixed fastening belt 74 becomes fixedly engaged with the female section 60 of the buckle 40 . in this manner the bag body 71 is provided with the adjustable fastening belt 72 having the male section 50 of the buckle 40 adjustably engaged therewith , and the cover 73 is provided with the fixed fastening belt 74 having the female section 60 fixedly engaged therewith . then the active length of the adjustable fastening belt 72 ranging from one end portion thereof secured on the bag body 71 to a point where the belt 72 is wound around the engagement rod 52 b of the engagement portion 52 of the male section 50 is adjusted to suit to the thickness of the bag body 71 or the amount of goods within the bag at that time . thereafter the latch arms 51 a of the resilient latch portion 51 of the male section 50 are snapped into the mating recess 61 of the female section 60 to connect the both fastening belts 72 and 74 to each other . as the result the cover 73 is reliably fastened to the bag body 71 to close the bag . when it is desired to open the bag or to separate the cover 73 from the bag body 71 , the latch arms 51 a of the resilient latch portion 51 of the male section 50 are resiliently inwardly biased toward each other . then , they are disengaged from the latch windows 61 a and pulled out from the mating recess 61 of the female section 60 to disconnect the adjustable fastening belt 72 and the fixed fastening belt 74 from each other . fig6 is a schematic perspective view representing another application of the buckle 40 wherein it is used for a sports bag . fig7 is an enlarged view representing a portion encircled by a circle “ b ” in fig6 . as is apparent in fig6 and 7 , the buckle 40 is used for the sports bag 30 having an adjustable fastening belt 32 secured at one end to a bag body 31 and a fixed fastening belt 34 secured at one end to a cover 33 . the cover 33 functions to open and close an opening of the bag body 31 . the fastening belt 32 and 34 are engaged with the buckle 40 in the following manner . the free end of the adjustable fastening belt 32 is passed through the through - hole 52 e from back to front side , and then it is passed through the through - hole 52 f from front to back side . as the result the belt 32 is wound around the engagement rod 52 b . this makes the adjustable fastening belt 32 adjustably engaged with the male section 50 of the buckle 40 . on the other hand , one end of the fixed fastening belt 34 is passed through the through - hole 62 b from front to back side so that the belt 34 is wound around the engagement rod 62 a . thereafter , both ends of the belt 34 are secured to the cover 33 by a sewing process , for example . then the fixed fastening belt 34 becomes fixedly engaged with the female section 60 of the buckle 40 . in this manner the bag body 31 is provided with the adjustable fastening belt 32 having the male section 50 of the buckle 40 adjustably engaged therewith , and the cover 33 is provided with the fixed fastening belt 34 having the female section 60 fixedly engaged therewith . then the active length of the adjustable fastening belt 32 ranging from one end portion thereof secured on the bag body 31 to a point where the belt 72 is wound around the engagement rod 52 b of the engagement portion 52 of the male section 50 is adjusted to suit to the thickness of the bag body 31 or the amount of goods within the bag at that time . thereafter the latch arms 51 a of the resilient latch portion 51 of the male section 50 are snapped into the mating recess 61 of the female section 60 to connect the both fastening belts 32 and 34 to each other . as the result the cover 33 is reliably fastened to the bag body 31 to close the bag . when it is desired to open the bag or to separate the cover 33 from the bag body 31 , the latch arms 51 a of the resilient latch portion 51 of the male section 50 are resiliently inwardly biased toward each other . then , they are disengaged from the latch windows 61 a and pulled out from the mating recess 61 of the female section 60 to disconnect the adjustable fastening belt 32 and the fixed fastening belt 34 from each other . in the embodiment as shown fig4 and 5 , when the male section 50 having the adjustable fastening belt 72 engaged therewith ( with the active length adjusted ) is mated to the female section 60 having the fixed fastening belt 74 engaged therewith to fasten the bag body 71 to the cover 73 , then it may happen that the engagement portion 52 of the male section 50 slightly projects beyond the side surface of the bag body 71 due to the thickness of the bag body 71 or the amount of the goods within the bag body 71 . in similar manner , in the embodiment as shown fig6 and 7 , when the male section 50 having the adjustable fastening belt 32 engaged therewith ( with the active length adjusted ) is mated to the female section 60 having the fixed fastening belt 74 engaged therewith to fasten the bag body 31 to the cover 33 , then it may also possible that the engagement portion 52 of the male section 50 slightly projects beyond the bottom surface of the bag body 31 due to the thickness of the bag body 31 or the amount of the goods within the bag body 31 . in such condition , however , the buckle 40 of the present invention does not produce any problems at all due to the construction of the buckle as described above . the reason for which will be described hereunder . fig8 is a schematic view representing the relation between the engagement portion 52 of the male section 50 of the buckle 40 and the adjustable fastening belt 72 or 32 under the condition as described above with reference to fig4 and fig6 . in such condition , even if any pulling force indicated by an arrow “ f ” is applied to one end of the adjustable fastening belt 72 or 32 , such pulling force “ f ” may not act to oppose the pulling force on the fixed fastening belt 74 or 34 . however , such pulling force “ f ” is substantially perpendicular to the direction of the engagement portion 52 of the male section 50 . therefore , the engagement portion 52 is subjected to this pulling force “ f ” through a portion of the adjustable fastening belt 32 that is wound around the engagement rod 52 b . as the result the engagement portion 52 is pivotally moved in clockwise about the pivot axis 51 b , as shown in fig8 . such pivotal movement of the engagement portion 52 can put the force “ f ” in a plane substantially same as that where the engagement portion 52 is present . accordingly the adjustable fastening belt 72 or 32 can be kept firmly wound around the engagement rod 52 b of the engagement portion 52 , thereby preventing the belt 72 or 32 from gradually unwinding . fig9 is a view similar to fig3 but representing a male section of a buckle according to another embodiment of the present invention . the male section of the buckle in this embodiment has substantially same construction as that of fig1 and therefore , the components corresponding to those in fig1 are indicated by the same reference numerals , and only difference therebetween will be described hereunder . the male section 50 in the embodiment in fig1 includes the pivot shafts 51 b at the opposite sides of the base of the resilient latch portion 51 and the pivot holes 52 d in the side arms 52 a of the engagement portion 52 , as described above . in contrast thereto , the male section 50 in the embodiment in fig9 includes pivot holes 51 c at the opposite sides of the base of the resilient latch portion 51 and pivot shafts 52 h on the side arms 52 a of the engagement portion 52 . the pivot shafts 52 h on the engagement portion 52 are mated to the pivot holes 51 c in the base of the resilient latch portion 51 to couple the engagement portion 52 to the resilient latch portion 51 . therefore the engagement portion 52 is made freely pivotally moved to the resilient latch portion 51 , thereby providing the same effect as described above . in this embodiment the pivot shafts 52 h are each provided on inner surfaces of both side arms 52 a , but the present invention is not limited to such construction . alternatively the pivot shafts 52 h may be replaced with only one pin spanned across the both side arms 52 a . in the embodiments as described above the pivotally moved engagement portion is provided on the male section of the buckle . however , the present invention is not limited to such construction and such pivotally moved engagement portion may be provided on the female section of the buckle . in addition , means for pivotally moving the engagement portion relative to the resilient latch portion is not limited to the combination of pivot shaft and pivot hole as described above , but it may include a hinge or other well known means . furthermore , in the embodiment as described above , the resilient latch portion and the engagement portion pivotally moved thereto are each molded independently as the discrete components . however , the present invention can also cover such construction that the resilient latch portion and the engagement portion are integrally molded as one unit in which they are connected through a flexible thin bride portion about which the resilient latch portion is pivotally moved relative to the engagement portion . fig1 is a schematic perspective view representing a buckle according to further embodiment of the present invention . fig1 is a view representing the buckle of fig1 , but in such condition that male and female sections are separated . the buckle 80 in this embodiment comprises a male section 90 and a female section 100 . in this embodiment the male section 90 includes an engagement portion 92 for an adjustable fastening belt and an resilient latch portion 91 having latch arms 91 a , both of which portions are integrally molded . therefore the engagement portion 92 is fixedly connected with the resilient latch portion 91 so that they are not pivotally moved to each other 91 . the male section 90 is substantially identical in construction to that of the conventional buckle , as described with reference to fig1 . accordingly no further description for the male section 90 will be made here . on the other hand , the female section 100 includes an engagement portion 102 for a fixed fastening belt that can be pivotally moved relative to a mating portion 103 having a recess 101 for receiving the resilient latch portion 91 of the male section 80 . the mating portion 103 includes latch windows 101 a at the opposite sides thereof , both of which windows communicating with the recess 101 . when mating the male section 90 to the female section 100 , the latch arms 91 a of the male section 90 are snapped into the latch windows 101 a so that the male and female sections can be keep connected . the way of pivotally moving the engagement portion 102 to the mating portion 103 may be same as that already described with reference to fig1 to 3 and 9 , and therefore , no further description will be made here . as compared to the buckle 40 , as already described with reference to fig1 to 9 , the buckle 80 in this embodiment has different construction in that the engagement portion 92 of the male section 90 is not pivotally moved . but , instead , the engagement portion 102 of the female section 100 is pivotally moved . however , such construction of the buckle 80 can still provide the same advantages as those for the buckle 40 in fig1 to 9 . in addition , in the buckle 80 , the engagement portion 92 of the male section 90 is used for engagement with the adjustable fastening belt and the engagement portion 102 of the female section 100 is for engagement with the fixed fastening belt . however the buckle 80 may have the inverse arrangement in which the engagement portion 92 of the male section 90 is used for engagement with the fixed fastening belt and the engagement portion 102 of the female section 100 is for engagement with the adjustable fastening belt . in this case the engagement portion 92 of the male section 90 may be pivotally moved . it is apparent from the foregoing that the present invention provides a new and improved buckle in which , irrespective of the direction of a pulling force applied to one end of an adjustable fastening belt engaged with the buckle , no such condition can be produced that the adjustable fastening belt is gradually loosened so that it is finally dropped off the buckle . accordingly the buckle of the present invention can always maintain better fastened condition for a bag , irrespective of the thickness of the bag that is fastened by use of the buckle .
disclosed is a buckle comprising a first section including an engagement portion for engagement with a belt - like , flexible , adjustable fastening member and a latch portion , and a second section which is structured to detachably mate with said latch portion of said first section , said engagement portion being capable of pivotally moving to said latch portion . according to the present invention , irrespective of the direction of a pulling force applied to one end of the adjustable fastening belt engaged with the buckle , no such condition can be produced that the adjustable fastening belt is gradually loosened so that it is finally dropped off the buckle .