Buckle for adjustably securing a belt or the like

Abstract: A buckle (10) comprises a pair of side flange portions (12, 12) interconnected in spaced relation by a plurality of transverse bars (13, 14, 15, 16), of which a first anchoring bar (15) and a second anchoring bar (16) are held in spaced partially superimposed relation to each other to define therebetween a substantially "Z"-like path (P) for wrapping therearound a web-like material or a belt (B), so that the belt (B) is firmly secured in place relative to the buckle (10) after its length has been adjusted.

Description: This invention relates to a buckle for adjustably securing a web-like material, typically a belt, for garments, bags, sports gears and the like. There are known a variety of buckles including means for adjusting the length of their associated belts or straps to suit a particular application. Japanese Utility Model Laid-Open Disclosure No. 63-110207 discloses one example of such prior buckle device which comprises a first side flange carrying a retainer bar and a second side flange carrying a winding bar with a stopper means, both flanges being pivotally connected to a transverse shaft, wherein the retainer bar is flipped back over the winding bar to retain a belt therebetween. When the belt is thus retained under pressure, there will be a counter-acting force exerted by the belt against the buckle tending to spread the two bars apart, this being more likely due to the shaft bore being relatively large. Another drawback of this prior art buckle is that it is a two-piece structure requiring the winding bar portion to be separately fabricated, leading to increased production cost. Another buckle of the known type is disclosed in Japanese Patent Publication No. 3-4203 in which there is shown a buckle having a first bar and a second bar with their respective confronting edges spaced apart a distance not greater than the thickness of a belt such that the belt is passed around the confronting edges along a path resembling somewhat the letter "Z". However, this path configuration is not distinct enough to ensure firm fixation of the belt relative to the buckle. DE-U-90 02 434.6 shows a buckle which is defined in the pre-characterising portion of claim 1. This buckle is made by two mould holes which come together at an angle to the centre plane of the buckle, and the rearward face of the upper bar and the forward face of the lower bar are co-planar and at an angle to the centre plane. With the foregoing drawbacks of the prior art in view, the present invention seeks to provide an improved buckle which is capable of securing a belt or the like firmly in place against releasing movement after adjustment of its length. The invention also seeks to provide an improved buckle which is relatively simple in construction and easy to manufacture as an integral structure having first and second belt anchoring bars defining therebetween a path which assumes a substantially "Z"-like cross-sectional configuration for the passage of a belt or the like. According to the invention there is provided a buckle for adjustably securing a belt or the like, the buckle comprising a generally frame-like body defined by side flange portions extending in a longitudinal direction and connected by a plurality of bars extending in parallel spaced relation transversely of said body, a fixing bar connected to a forward end of said flange portions for securing one end of the belt, a first anchoring bar having an anchoring portion directed away from said forward end of said body and a second anchoring bar having an anchoring portion directed towards said forward end, said first and second anchoring bars being in spaced partially superimposed relation on respective sides of a plane extending in said longitudinal direction with said anchoring portion of said second anchoring bar being forwards of said anchoring portion of said first anchoring bar, thereby establishing a substantially cross-sectionally "Z"-like path (P) for wrapping therearound the opposite end of the belt which extends rearward of the buckle, said anchoring portion of said second anchoring bar comprising a face which faces in said forward direction characterised in that said face of said anchoring portion subtends an angle of at least 90 degrees with said longitudinal plane when measured in the forward direction, whereby, in use, said opposite end of said belt engages transversely extending upper and lower edges of said face. The above and other objects and features of the invention will be better understood from the following detailed description taken in connection with the accompanying drawings which illustrate by way of example some preferred embodiments. Like reference numerals refer to like or corresponding parts throughout the several views. Figure 1 is a plan view of a buckle according to a first embodiment of the invention; Figure 2 is a cross-sectional view taken on the line II - II of Figure 1; Figure 3 is a view similar to Figure 2 but showing a modified portion; Figure 4 is a plan view of a buckle according to a second embodiment of the invention; Figure 5 is a cross-sectional view taken on the line V - V of Figure 4; Figures 6 - 9 inclusive are cross-sectional view of respective variations of the second embodiment of the invention; Figure 10 is a plan view of a modified form of buckle embodying the invention; Figure 11 is a cross-sectional view taken along the line XI - XI of Figure 10; Figure 12 is a cross-sectional view taken along the line XII - XII of Figure 10; Figure 13 is a cross-sectional view of another modified form of buckle; Figure 14 is a diagrammatic sectional view of a mold; Figure 15 is a cross sectional view taken along the line XV - XV of Figure 14; Figure 16 is a diagrammatic sectional view of another mold; Figure 17 is a plan view of a further modified form of buckle embodying the invention; Figure 18 is a cross sectional view taken along the line XVIII - XVIII of Figure 17; Figure 19 is a plan view of still another modified form of buckle; Figure 20 is a plan view of still further modified form of buckle; and Figures 21 and 22 are diagrammatic sectional views of another set of molds. Referring now to the drawings and Figure 1 in particular, there is shown a buckle 10 according to a first embodiment of the invention which is made of a metallic material or a plastic material, the latter being preferred for expedient shaping by molding into a desired polygonal one-piece structure in a manner hereinafter to be described. The buckle 10 comprises a generally frame-like body 11 defined by side flange portions 12, 12 which are interconnected by a plurality of bars extending in parallel spaced relation transversely of the body 11. The flange portions 12, 12 have a thickness at one end 11a sufficient to accommodate two partially superimposed anchoring bars later described and taper progressively towards the opposite end 11b of the buckle body 11 as better shown in Figure 2. An end transverse bar 13 merging with the side flanges 12, 12 to define the tapered end 11b of the buckle body 11 is spaced from a fixing bar 14 to allow one end of a belt B to pass between the bar 13 and the bar 14 and wrap around the bar 14, the belt B being fastened normally permanently by sewing or other suitable means as at S. A first anchoring bar 15 is disposed remote from the tapered end 11b with its arcuate surface 15a lying short of, or "below", the upper surfaces of the flange portions 12, 12. The first anchoring bar 15 is recessed to provide a first sharp corner 15b directed rearwardly, that is, towards the thickened end 11a of the buckle body 11 and a second sharp corner 15c directed forwardly, that is, towards the tapered end 11b. A second anchoring bar 16 is disposed below the first anchoring bar 15 with a lower surface 16a lying substantially flush with the lower surfaces of the flange portions 12, 12 and joining with an upper surface 16b to provide a corner 16c. According to an important aspect of the invention, the first and second anchoring bars 15 and 16 are held in spaced partially superimposed relation to each other, with the corner 16c of the second bar 16 protruding into a region below the first bar beyond a vertical axial line A - A extending, in contact with the sharp corner 15b of the first bar 15, perpendicularly to the longitudinal plane or the buckle body 11, so that there is defined a path P extending in a substantially cross-sectionally "Z"-like configuration between the first and second anchoring bars 15 and 16 as indicated by the phantom line in Figure 2. With this construction, the belt B is trained with its free end portion B' around the second sharp corner 15c, up around the the arcuate upper surface 15a, down around the first sharp corner 15b, around the obtuse corner 16c and pulled under the lower surface 16a for a distance required to achieve a desired length adjustment of the belt B, in which instance the letter "Z" path defined by the upper surface 15a and first sharp corner 15b of the first bar 15 and the corner 16c and lower surface 16a of the second bar 16 functions to ensure firm anchoring of the belt B as adjusted within the buckle body 11. According to a preferred aspect of the invention, the second anchoring bar 16 has its upper surface 16b formed substantially horizontally flat and parallel to the longitudinal plane of the buckle body 11 to provide a free space F between the first corner 15b of the first bar 15 and the upper surface 16b of the second bar 16, such free space F being advantageously utilized for the insertion of a side molding core C during molding operation. Designated at 17 is a transverse end bar attached to the thickened end of the buckle body 11 and serving as a handle on one hand and as a cover on the other to conceal the interior of the buckle body 11 to render the appearance of the buckle attractive. Figure 3 illustrates a modification of the buckle described above and shown in Figures 1 and 2, the modification being directed to a first anchoring bar 18 having a flat upper surface 18a, a first vertical face 18b, an arcuate lower surface 18c and a flat lower surface 18d, surfaces 18b and 18d defining therebetween a first corner 18e; a second vertical face 18f defining with the upper surface 18a a second corner 18g, and also directed to a second anchoring bar 19 having a flat upper surface 19a, a handle 20 as an extension thereof, a slightly acute, nearly right-angled corner 19b and an upwardly inclined lower surface 19c. The modification, despite these structural changes, provides a function similar to the first embodiment. Figures 4 through 9 inclusive are illustrative of a second embodiment of the invention and utilized to explain the manner in which the desired "Z"-like belt path P is formed by the use of various auxiliary attachments provided separately from the buckle body. Throughout these figures only those parts which participate in the formation of the "Z"-like path P will be described with other parts of the buckle omitted from explanation for purposes of brevity. As shown in Figures 4 and 5, a first anchoring bar 20 has an upper inclined surface 20a and a lower inclined surface 20b defining therebetween a sharp corner 20c and a vertical surface 20d having formed therein a transversely extending groove 20e directed towards the thickened end 11a of the buckle body 11. A second anchoring bar 21 formed integrally with a horizontally extending handle 22 is provided with a series of transversely spaced notches 21a for engagement with the belt B and has a corner 21b around which the belt B is trained. An auxiliary attachment 23 is formed substantially symmetric to the first anchoring bar 20 and has an upper surface 23a and a lower surface 23b defining therebetween a sharp corner 23c and a vertical surface 23d having formed thereon a transverse ridge 23e. This attachment 23, which is a separate piece prior to assembly on the buckle body, is joined with the first anchoring bar 20 by snapping the ridge 23e into the groove 20e, when the corner 23c of the attachment 23 lies across and projects into a region above the second bar 21 thereby establishing the "Z"-like path P along which the belt B is trained and secured in place after adjustment. A variation of the second embodiment of the invention, and similar to the first embodiment of Figures 1 and 2, is shown in Figure 6 in which a buckle 30 comprises a first anchoring bar 31 having an arcuate upper surface 31a merging into a sharp corner 31b and a vertical surface 31c having formed therein a transverse groove 31d. A second anchoring bar 32 is similar in construction to the bar 16 shown in Figure 2. An auxiliary attachment 33, initially separate from the buckle body, has an arcuate upper surface 33a merging into a corner 33b and a vertical surface 33c with a transverse ridge 33d formed thereon for engagement with the mating groove 31d in the first anchoring bar 31. With the attachment 33 engaged with the first bar 31, the first bar 31 and the second bar 32 are disposed in partially superimposed relation to each other thereby establishing the "Z"-like belt path P. Figure 7 shows another variation of the second embodiment of the invention, also similar to the first embodiment of Figures 1 and 2, in which a buckle 40 is substantially similar in construction to the buckle shown in Figure 6 except that an auxiliary attachment 41 is adapted for engagement with a second anchoring bar 43, while a first anchoring bar 42 is a solid piece. Figure 8 shows a further modification of the second embodiment of the invention in which a buckle 50 comprises a first anchoring bar 51 having a sharp corner 51a directed forwardly towards the tapered end of the buckle body and an indent 51b disposed opposite to the corner 51a. A guide slot 52 is provided for inserting therethrough an auxiliary attachment 53 which has a sharp corner 53a directed toward the thickened end of the buckle body and a projection 53b complimentary in shape for fitting engagement with the indent 51b of the first anchoring bar 51. Figure 9 shows still another variation of the second embodiment of the invention which shows a buckle 60 similar to that of Figure 8 but features the provision of an additional auxiliary attachment 61 for engagement with a second anchoring bar 62. Figures 10 - 12 inclusive show a third embodiment of the invention which is characterized by the formation of the "Z" belt path P by means of a through-opening 70. This through-opening extends transversely between the side flange portions 12, 12 and vertically between the first anchoring bar 15 and the second anchoring bar 16, defining therebetween a rectangular cross-over zone where these bars 15 and 16 are held in vertically spaced, partially superimposed relation to each other, whereby the belt (not shown) is led along a substantially "Z"-like path extending between the corners 15b and 16c of the respective bars. The through-opening 70 is conveniently formed upon molding of the buckle by a molding device 71 shown in Figures 14 and 15 which comprises an upper mold 72 and a lower mold 73 having respective shaping cavities, in which there is provided a side core 74 releasably mounted for shaping the corresponding through-opening 70. A modified form of through-opening 80 is shown in Figure 13 which extends transversely between the side flange portions 12, 12 to define a stepped recess 81 in the second anchoring bar 16 thereby establishing the "Z" path P between the corners 15b and 16c of the two bars 15 and 16. This through-opening 80 is formed by a corresponding shaped side core C' mounted transversely across the mold 70, in which instance an additional side core C'' is used to fill the space between the corners 15b and 16c of the respective bars 15 and 16, the core C'' being inserted longitudinally of the buckle body in a direction traversing the core C' as shown in Figure 16. Figures 17 - 22 inclusive illustrates a fourth embodiment of the invention which, like the previously described embodiments, ensures the formation of the "Z" path P for firmly securing the belt B in place therealong. The buckle shown in Figures 17 and 18 comprises a first anchoring bar 90 having alternate ridges 90a and grooves 90b extending along one edge facing the thickened end of the buckle body 11 and a second anchoring bar 91 having alternate ridges 91a and grooves 91b extending along one edge facing the opposite tapered end of the buckle body 11. The ridges 90a and grooves 90b of the first bar 90 are positioned in spaced superimposed relation to the grooves 91b and 91a of the second bar 91 so that the ridges and grooves of the respective bars appear inter-engaged as viewed from above and thus define a substantially "Z"-like path therebetween for the passage of the belt B. The buckle having such ridge and groove arrangement may be conveniently fabricated by a molding device 100 shown in Figures 21 and 22 which includes four separable molds 100a - 100d with ridge and groove forming portions 100e and 100f. A variation of the fourth embodiment shown in Figure 19 differs from that of Figures 17 and 18 in that the ridges and grooves of the respective first and second bars 90 and 91 jointly define a wave-like formation. Another variation shown in Figure 20 differs from that of Figures 17 and 18 in that the ridges and grooves of the first bar 90 are spaced across a gap 92 from the mating ridges and grooves of the second bar 91. These variations of the fourth embodiment may be formed by slightly modifying the mold 100 as appears apparent to one skilled in the art.

Claims: A buckle (10) for adjustably securing a belt or the like (B), the buckle (10) comprising a generally frame-like body (11) defined by side flange portions (12, 12) extending in a longitudinal direction and connected by a plurality of bars (13,14,15,16) extending in parallel spaced relation transversely of said body (11), a fixing bar (14) connected to a forward end of said flange portions (12, 12) for securing one end of the belt (B), a first anchoring bar (15) having an anchoring portion (15b) directed away from said forward end (11b) of said body (11) and a second anchoring bar (16) having an anchoring portion (16c) directed towards said forward end (11b), said first and second anchoring bars (15, 16) being in spaced partially superimposed relation on respective sides of a plane extending in said longitudinal direction with said anchoring portion (16c) of said second anchoring bar (16) being forwards of said anchoring portion (15b) of said first anchoring bar (15), thereby establishing a substantially cross-sectionally "Z"-like path (P) for wrapping therearound the opposite end of the belt (B) which extends rearward of the buckle, said anchoring portion of said second anchoring bar (16) comprising a face which faces in said forward direction characterised in that said face of said anchoring portion subtends an angle of at least 90 degrees with said longitudinal plane when measured in the forward direction, whereby, in use, said opposite end of said belt engages transversely extending upper and lower edges of said face. A buckle (10) according to claim 1, characterised in that said second anchoring bar (16) has a surface (16b) adjacent said longitudinal plane formed substantially flat and parallel to the longitudinal plane of the buckle (12). A buckle (10) according to claim 1, characterised in that said first anchoring bar comprises a first portion (,31,51) integrally formed with said side flange portions (12,12) and having a transversely extending groove (20e,31d,51b) opening away from said forward end of said body (11), and a second portion (23,33,53) having a transversely extending ridge (23e,33d,53b) which engages the transversely extending groove (20e,31d,51b), said second portion forming said anchoring portion of said first anchoring bar. A buckle (10) according to claim 1, characterised in that said second anchoring bar (16,43) comprises a first portion (43,62) integrally formed with said side flange portions (12,12) and a second portion (41,61) which engages with said first portion (43,63) and forms said anchoring portion of said second bar (16). A buckle (10) according to claim 1, characterised in that said buckle body (11) has a through-opening (70,80) extending transversely across said side flange portions (12,12) between said first anchoring bar (15) and said second anchoring bar (16). A buckle (10) according to claim 1, characterised in that said first anchoring bar (15,90) and said second anchoring bar (16,91) have alternate ridges (90a,91a) and grooves (90b,91b) which extend transverse to said longitudinal plane. A buckle (10) according to claim 1, characterised in that said buckle body (11) is formed from a plastic material.

Inventors: MURAI RYUKICHI, MURAI, RYUKICHI
Applicants: YKK CORP, YKK CORPORATION
Application year: 1993
Main classification: A44B11
IPC codes: A44B11