EP0211988B1 - Schnalle mit Gleitsteg - Google Patents
Schnalle mit Gleitsteg Download PDFInfo
- Publication number
- EP0211988B1 EP0211988B1 EP19850110526 EP85110526A EP0211988B1 EP 0211988 B1 EP0211988 B1 EP 0211988B1 EP 19850110526 EP19850110526 EP 19850110526 EP 85110526 A EP85110526 A EP 85110526A EP 0211988 B1 EP0211988 B1 EP 0211988B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strap
- engagement portion
- central
- grip base
- arms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B11/00—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts
- A44B11/02—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps
- A44B11/06—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps with clamping devices
- A44B11/10—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps with clamping devices sliding wedge
Definitions
- the present invention relates to an adjustable strap fastener of synthetic resin for adjustably interconnecting strap or belt ends on a bag or the like. More particularly, it relates to a sliding bar buckle having a strap retainer bar slidably mounted on a hollow or open rectangular frame for frictionally retaining a strap end.
- adjustable strap fasteners or buckles which may be manipulated to adjust the effective length of a strap on, for example, a bag.
- such fasteners are made of a plastic material formed into an integral molded structure which generally comprises a pair of laterally spaced legs, a grip base portion at one end of the legs, a connecting portion at the opposite end of the legs, and a plurality of cross bars disposed in between the grip base and connecting portions across between the legs.
- one strap end portion is looped around one of the cross bars, passed under the connecting portion and secured in place as by stitching or riveting.
- the other strap end portion which is adapted for length adjustment is looped around another cross bar, passed under the grip base portion and frictionally gripped therebetween against displacement.
- Such frictionally gripped strap tends to get loose when subjected to tensioning forces applied thereto. This tendency is less the smaller the gap between the grip base portion and the last-named cross bar, but the insertion or passage of the strap through the gap becomes more difficult.
- a strap fastener includes an open rectangular connector frame and strap retainer bar movably mounted on the frame.
- the frame has a grip base and a pair of laterally spaced legs extending from the grip base in a common direction and having a pair of transversely aligned oblong slots, respectively, extending longitudinally of the legs.
- the strap retainer bar has a pair of opposite arms loosely received in the respective oblong slots for sliding movement therein so that the strap retainer is movable toward and away from the grip base.
- one end of a strap is looped around a central strap engagement portion of the regainer bar, and then passed under the base.
- the strap retainer bar When the strap is longitudinally tensioned, the strap retainer bar is displaced toward the base to press the strap against a strap bearing surface of the grip base. During that time, the strap retainer bar is likely to turn about the arms because the arms are loosely received in the slots. This angular movement of the retainer bar tends to reduce the holding force acting on the strap. This tendency will be greater where the central strap engagement portion has a circular, elliptical or rectangular shape in cross section, and the central strap engagement portion is disposed coaxially with the arms.
- the present invention seeks to provide an adjust- 4 able strap fastener which can eliminate or substantially overcome the foregoing drawbacks of the prior art fasteners.
- the present invention further seeks to provide a molded sliding bar buckle having structural features which enable a strap retaianer bar to move linearly toward a grip base of the buckle frame without causing rotation when a strap is longitudinally tensioned, thereby holding the strap against displacement with a great holding force.
- the present invention further seeks to provide a molded sliding bar buckle having a movable strap retainer capable of imposing a large frictional resistance to a strap, thereby frictionally holding the strap with an increased holding force.
- a sliding bar buckle comprising: a molded connector frame of synthetic resin including a grip base having a strap bearing surface, a pair of spaced legs extending integrally from opposite ends of said grip base and having a pair of transversely aligned oblong slots, respectively, spaced from said grip base by a distance, and a connecting bar extending integrally between said legs remotely from said grip base; and a strap retainer of molded synthetic resin including a central strap engagement portion having a strap pressing surface for frictionally pressing a strap end portion against said strap bearing surface, and a sloped flat surface on its back inclined downwardly toward said strap bearing surface, said sloped flat surface having an upper end disposed adjacent to said connecting portion and a lower end disposed adjacent to said grip base, said upper end lying in a plane extending through a center of the thickness of said central strap engagement portion, and a pair of arms extending integrally from opposite ends of said central strap engagement portion and loosely non-rotatably fitted in said oblong slots, respectively, said
- FIGS 1 through 8 show a sliding bar buckle embodying the present invention.
- the sliding bar buckle comprises an open or hollow connector frame 1 of a rectangular shape, and a strap retainer bar 10 movably mounted on the open connector frame 1.
- the open connector frame 1 and the strap retainer bar 10 are molded of synthetic resin.
- the open connector frame 1 comprises an integral molded construction composed of a grip base 2, a pair of spaced parallel legs 3, 3 extending integrally from opposite ends of the grip base 2, a connecting bar 4 extending integrally between the ends of the legs 3, 3 remotely from the grip base 2, and a strap connector 5 extending integrally between the legs 3, 3 and positioned more closely to the connecting bar 4 than to the grip base 2.
- the grip base 2 has a flat strap bearing surface 6 facing toward the strap connector 5 in parallel relation thereto and blending into the bottom face of the grip base 2.
- the grip base 2 also has an integral grip wing or tab 7 projecting away from the strap bearing surface 6.
- a plurality of parallel biting ridges 8 is disposed on the underside of the grip base 2 and they extend from the strap bearing surface 6.
- the legs 3, 3 have a pair of oblong slots 9, 9 respectively, extending transversely therethrough in transverse registry with each other. As shown in Figure 6, each slot 9 has a longitudinal end spaced from the strap bearing surface 6 by a distance 11. Accordingly, the legs 3, 3 have substantial solid portions through which they are joined to the grip base 2. Each of the legs 3, 3 has a thickness greater than the thicknesses of the grip base 2, the connecting bar 4, and the strap connector 5.
- the strap retainer bar 10 is composed of an elongate central strap engagement portion 11 and a pair of aligned arms 12,12 extending integrally from opposite ends of the central strap engagement portion 11.
- the arms 12, 12 have an oval cross section such that they are loosely received in the respective oblong slots 9, 9 and are slidably movable therein, but are prevented from rotating in the respective slots 9, 9.
- the central strap engagement portion 11 includes a flat strap pressing surface 13 extending in confronting relation to the strap bearing surface 6, and an arcuately curved surface 14 extending from the flat strap pressing surface 13 and blending into a rounded face of the central strap engagement portion 11.
- the central strap engagement portion 11 except its underside, has a roughened surface similar to a grain finish, having a multiplicity of minute projections to give an increased coefficient of friction to the central strap engagement portion 11.
- the central strap engagement portion 11 is thicker than the arms 12, 12, with the flat strap pressing surface 13 spaced transversely from the arms 12, 12 at least by the distance h ( Figure 6).
- the arms 12, 12 are slightly displaced out of coaxial alignment with the central strap engagement portion 11 toward the strap connector 5. With this eccentric engagement, the distance 11 can be enlarged which produces a mechanically strong pair of junctions between the grip base 2 and the legs 3, 3.
- the central strap engagement portion 11 has on its back a flat sloped surface 15 inclined downwardly toward the grip base 2 and blending into a flat bottom face 14a (Figure 7) of the strap engagement portion 11 which is located adjacent to the strap bearing surface 6 of the grip base 2.
- the flat sloped surface 15 has an upper end 15a disposed adjacent to a strap connector 5 and a lower end 15b disposed adjacent to the strap bearing surface 6 of the grip base 2, the upper end 15a lying in a plane 16 extending through a center of the thickness of the central strap engagement portion 11.
- the arms 12,12 are disposed in the same level as the central strap engagement portion 11.
- the strap engagement portion 11 is divided by the central plane 16 into a generally semicylindrical upper portion and a generally wedge-shaped lower portion, the strap pressing surface 13 substantially extending perpendicularly downwardly from the central plane 16.
- the arms 12, 12 are molded loosely but non-rotatably in slots 9, 9 in the legs 3, 3 using a pair of molds, respectively, at the same time that the open or hollow connector frame 1 and the strap retainer bar 10 are molded.
- One of such molds is shown in Figure 11, the mold being designated at 18.
- the mold 18 comprises a sleeve portion 17 having an opening or recess 19.
- each slot 9, 9 is formed by an outer peripheral surface of the sleeve portion 17 while each arm 12 is formed by an inner peripheral surface of the recess 19.
- These molds constitute part of an entire mold assembly (not shown) for molding the open connector frame 11 and the strap retainer bar 10 at the same time.
- a strap end portion A is threaded between the connecting bar 4 and the strap connector 5 from the back to the face of the connector 5 and then between the connector 5 and the strap retaining bar 10 from the face to the back of the connector frame 1.
- the strap end portion A is turned over to form a loop around the strap connector 5 and fixed to itself shown in Figure 8.
- Another strap end portion B is threaded between the strap connector 5 and the strap retainer bar 10 from the back to the face of the connector frame 1 and then between the strap retainer bar 10 and the grip base 2 from the face to the back of the connector frame 11.
- the strap end portion B is frictionally held against the biting ridges 8 while forming a loop around the strap retainer bar 10.
- the strap retainer bar 10 is displaced toward the grip base 2 to enable the strap pressing surface 13 to press the flat strap end portion B against the flat strap bearing surface 6. Then, the comers of the ends of the biting ridges 8 are kept in biting engagement with the strap end portion B.
- the strap end portion B is now prevented from being loosened off the sliding bar buckle, as shown in Figure 9.
- the grip tab 7 is gripped by the user, and the connector frame 1 is turned counterclockwise ( Figure 8) through an angle of approximately 90 ° about the connecting bar 4 until the strap end portion B is released from engagement with the strap bearing surface 6 and the biting ridges 8. Then, the strap end portion B is longitudinally adjusted until a desired strap length is achieved.
- the sliding bar buckle of the foregoing construction has many advantages: With the central strap engagement portion 11 having the flat sloped surface 15, when the strap is tensioned longitudinally, a component of a tensioning force which acts on the retainer bar 10 in a direction perpendicular to the central plane 16 to tend to rotate the retainer bar 10 counterclockwise in Figure 9 is negligible.
- the tensioning force applied to the strap is transformed substantially into a force or vector P ( Figure 9) acting on the central plane in a direction to tend to move the strap retainer bar 10 linearly toward the grip base 2.
- the strap end portion B is securely held on the sliding bar buckle with a strong holding force.
- the strap retainer bar 10 includes an strap engagement portion 11 a of an oval shape as shown in Figure 10 and it has no such sloped flat surface 15
- a tensioning force on the strap is mainly transformed into a component force acting on the orval strap engagement portion 11 a in a direction perpendicular to the central plane 16 to tend to turn the retainer bar 10 counterclockwise in this figure.
- the strap retaining portion 11 a thus tilted and the grip base 2 provide a small area of contact with the strap, producing a small frictional resistance against the strap sandwiched therebetween. This tendency becomes greater as the tensioning force is increased.
- the angular movement of the strap retainer bar 10 causes the arms 12 to abut against the circumferential walls of the slots 9 at diagonally opposite portions thereof with the re- suit that the circumferential walls are deformed or damaged, thereby permitting rotation of the arms 12 therein.
- Both the strap bearing surface 6 and the strap pressing surface 13 are flat and parallel to one another and the strap pressing surface 13 is disposed substantially below the central plane 16 of the strap engagement portion 11 with the result that the strap end portion B is gripped between these surfaces 6, 13 below the central plane 16.
- Such gripping system prevents the retainer bar 10 from being turned when the retainer bar 10 is subjected to a force acting thereon in a direction perpendicular to the central plane 16 of the strap engagement portion 11.
- the legs 3, 3 are transversely spaced from each other by a distance 1 2 ( Figure 1) slightly narrower than the width of a strap used by 0.3 mm to 0.5 mm, for example.
- This negative clearance is preferable in that the strap as retained on the strap retainer bar 10 will not be released or loosened, due to frictional resistance between lateral edges of the strap and the legs 3, 3 as when the strap becomes free of tensioning forces or the bag on which the sliding bar buckle is used not carried by the user. Accordingly, there is no need for strap adjustment when the bar is carried by the user again. If the distance 1 2 were larger than the width of a strap used, the strap would easily be loosened off the sliding bar buckle or the latter would move relatively to the strap when the strap is released of tensioning forces.
- the strap end portion A may be attached to the connecting bar 4 in the manner described above in which case the strap connector 5 may be omitted.
- Figures 12 through 14 illustrate a sliding bar buckle according to another embodiment of the present invention.
- the sliding bar buckle is suitable for use, for example, as a male member of a buckle assembly on each of a pair of suspenders.
- the sliding bar buckle includes an integrally molded construction composed of a male member 20, an open or hollow connector frame 21, and a strap retainer bar 30 movably mounted on the open connector frame 21.
- the male member 20, the connector frame 21, and the strap retainer bar 30 are all made of synthetic resin.
- the connector frame 21 comprises a base 22, a pair of legs 23, 23 extending integrally from opposite ends of the base 22 in a common direction, and a connecting bar 24 extending integrally between the legs 23, 23 at the distal ends thereof remote from the base 22.
- the base 22 has a flat strap bearing surface 26 facing toward the connecting bar 24.
- the base 22 also has a plurality of biting ridges 27, 28 onto its opposite surfaces, the biting ridges 27, 28 extending parallel to the legs 23, 23 from the strap bearing surface 26 of the base 22.
- the biting ridge 27, 28 have end surfaces facing toward the connector bar 24.
- the legs 23, 23 have a pair of oblong slots 29, 29 in transverse registry with each other, the slots 29, 29 having ends spaced a distance 11 from the strap bearing surface 26 as shown in Figures 12 and 14. Thus, a pair of junctions between the base 22 and the legs 23, 23 is mechanically strengthened.
- the strap retainer bar 30 is composed of a central strap engagement portion 31 and a pair of coaxial arms 32, 32 of a substantially oval cross section extending from opposite ends of the entral strap engagement portion 31.
- the arms 32, 32 are loosely received in the oblong slots 29, 29, respectively for sliding movement therein, but are prevented from rotating in the respective slots 29, 29.
- the central strap engagement portion 31 has a strap pressing surface 33 facing toward and lying parallel to the strap bearing surface 26.
- the central strap engagement portion 31 has a roughened surface similar to a grind finish extending over the periphery except the underside thereof. Further, the central strap engagement portion 31 is thicker than the arms 32, 32 with the flat strap pressing surface 33 spaced transverely from the arms 32, 32 at least by the distance h ( Figure 13).
- the arms 32, 32 are slightly displaced out of coaxial alignment with the central strap engagement portion 31 toward the connecting bar 24. This eccentric arrangement enables the distance h to be enlarged with the result that a pair of mechanically strong joints can be provided between the base 22 and the legs 23, 23.
- the central strap engagement portion 31 has on it underside a sloped flat surface 35 inclined downwardly toward the grip base 22 and blending into a flat bottom face of the strap engagement portion 31.
- the sloped flat surface 35 has an upper end 35a disposed adjacent to the connecting bar 24 and a lower end 35b adjacent to the strap pressing surface 33, the upper end 35a lying in a plane 36 extending through a center of the thickness of the strap engagement portion 31.
- the arms 32, 32 and the strap engagement portion 31 are disposed in the same plane 36 but they are eccentric with each other.
- the strap retainer bar 30 can be molded at the same time that the connector frame 21 is molded so that they are molded in an assembled condition. Such molding operation can be accomplished by using the mold 18 shown in Figure 11.
- a strap end portion B is threaded between the strap retainer bar 30 and the connecting bar 24 from the back to the face of the connector frame 21 and then threaded back between the strap retainer bar 30 and the base 22, thus providing a loop around the strap retainer bar 30, as shown in Figure 14.
- the male member 20 is frictionally inserted into a female member (not shown).
- the strap retainer bar 30 is disposed toward the base 22 until the strap end B is pressed by the strap pressing surface 33 against the strap bearing surface 31.
- a component of a tensioning force which acts on the strap retainer bar 30 to tend to turn the latter in the counterclockwise direction ( Figure 14) is substantially negligible and therefore the tensioning force is transformed substantially into a force acting on the plane 36 in a direction to move the retainer bar 30 linearly toward the grip base 22.
- the strap pressing surface 33 which extends downwardly from the central plane 36, serves to prevent angular movement of the retainer bar 30.
- the strap end portion B is also engaged securely by corners of the biting ridges 28 (or ridges 27 if threaded from other side) against forces tending to loosen the strap end portion B off the connector frame 21.
- the base 22 is gripped by user and turned counterclockwise (Figure 14) about the connector bar 24 through an angle of 90 ° until the strap end portion B is disengaged from the biting ridges 28.
- the strap retainer bar 30 is then displaced from the base 22, and the strap end portion B can be pulled in any direction for length adjustment.
- the legs 23, 23 are transversely spaced from each other by a distance 1 2 slightly smaller than the width of the strap used by 0.3 mm to 0.5 mm, for example so that the strap will frictionally be engaged edgewise by the legs 23, 23 when the strap is released of any tension. This feature prevents the strap from being loosened accidentally when not in use.
Landscapes
- Buckles (AREA)
Claims (2)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19850110526 EP0211988B1 (de) | 1985-08-21 | 1985-08-21 | Schnalle mit Gleitsteg |
DE8585110526T DE3571744D1 (en) | 1985-08-21 | 1985-08-21 | Sliding bar buckle |
GB8520959A GB2179392B (en) | 1985-08-21 | 1985-08-21 | Sliding bar buckle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19850110526 EP0211988B1 (de) | 1985-08-21 | 1985-08-21 | Schnalle mit Gleitsteg |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0211988A1 EP0211988A1 (de) | 1987-03-04 |
EP0211988B1 true EP0211988B1 (de) | 1989-07-26 |
Family
ID=8193696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850110526 Expired EP0211988B1 (de) | 1985-08-21 | 1985-08-21 | Schnalle mit Gleitsteg |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0211988B1 (de) |
DE (1) | DE3571744D1 (de) |
GB (1) | GB2179392B (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2701638B1 (fr) * | 1993-02-17 | 1995-07-07 | Komet | Perfectionnements aux boucles de securite pour ceintures, harnais et dispositifs similaires. |
EP1206916A1 (de) * | 2000-11-20 | 2002-05-22 | Down East, Inc. | Zweiteilig ausgebildete, verstellbare leicht lösbare Schnalle |
FR3045284B1 (fr) * | 2015-12-18 | 2019-05-31 | Salomon Sas | Dispositif de reglage du niveau de serrage d'une sangle |
AU2018240480B2 (en) | 2017-03-23 | 2024-03-28 | John Morris | Tourniquet with rotatable buckle assembly |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB979448A (en) * | 1962-05-22 | 1965-01-06 | Ash & Rogers Ltd | Improvements in releasable fastenings suitable for straps and the like |
US3237258A (en) * | 1964-08-13 | 1966-03-01 | Robert C Fisher | Safety belt buckle |
US3399431A (en) * | 1967-04-17 | 1968-09-03 | Superior Industries | Safety seat belt buckle |
GB1558105A (en) * | 1977-04-27 | 1979-12-19 | Suris L I | Devices for tensioning and locking cargo net straps |
JPS5928330U (ja) * | 1982-08-12 | 1984-02-22 | 日本ノーション工業株式会社 | ベルト調節具 |
-
1985
- 1985-08-21 GB GB8520959A patent/GB2179392B/en not_active Expired
- 1985-08-21 DE DE8585110526T patent/DE3571744D1/de not_active Expired
- 1985-08-21 EP EP19850110526 patent/EP0211988B1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB8520959D0 (en) | 1985-09-25 |
DE3571744D1 (en) | 1989-08-31 |
GB2179392B (en) | 1989-08-23 |
EP0211988A1 (de) | 1987-03-04 |
GB2179392A (en) | 1987-03-04 |
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