EP2832249A1 - Strap buckle assembly for clamping a strap - Google Patents
Strap buckle assembly for clamping a strap Download PDFInfo
- Publication number
- EP2832249A1 EP2832249A1 EP13178828.3A EP13178828A EP2832249A1 EP 2832249 A1 EP2832249 A1 EP 2832249A1 EP 13178828 A EP13178828 A EP 13178828A EP 2832249 A1 EP2832249 A1 EP 2832249A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- strap
- clamping
- buckle assembly
- force
- 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.)
- Granted
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- 238000005452 bending Methods 0.000 claims abstract description 53
- 230000003247 decreasing effect Effects 0.000 claims description 13
- 239000013013 elastic material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 3
- 230000001965 increasing effect Effects 0.000 description 16
- 230000001154 acute effect Effects 0.000 description 4
- 230000005465 channeling Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 210000004247 hand Anatomy 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000037361 pathway Effects 0.000 description 3
- 238000009877 rendering Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
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
- A44B11/16—Strap held by spring action
-
- 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
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- Buckles (AREA)
Abstract
Description
- The present subject matter relates to a strap buckle assembly for clamping a strap.
- Commonly known strap buckle assemblies comprise a buckle made of one piece having two opposite end portions for attaching a strap. Normally, the strap has a fixed and a free end. The fixed end is mounted to a first end portion of the buckle. The free end is guided through a maze positioned on a second end portion of the buckle, wherein the first and second end portions are located on opposite sides of the buckle.
- Through the maze a pathway is formed which guides the strap. The pathway and the maze, respectively, is normally formed by two bars of the buckle displaced to each other such that between the strap and the bars a high friction force is produced. This friction force makes it difficult for the strap to move. Thus, the strap is clamped within the maze.
- However, for adjusting the length of the strap a complicated procedure has to be done by a user. For example, the length of the strap between the first and second end portions of the buckle is increased if at first the user pulls a certain amount of the strap between the two bars. The pulling is done such that the distance between the free end of the strap and the buckle is decreased. By doing so, a loop of the strap is obtained between the two bars. Subsequently, the strap is pulled again such that the loop is severed. This is done by pulling on a portion of the strap positioned between the maze and the fixed end mounted to the first end portion of the buckle. Hence, by pulling the free end of the strap into the direction of the buckle the length of the strap between the maze and the first end portion of the buckle mounted to the fixed end of the strap is increased.
- By performing the above described procedure reverse, the length of the strap between the maze and the first end portion of the buckle mounted to the fixed end of the strap is decreased.
- Further, for example a parent intends to do an adjustment of the strap that fixate a child in a child carrier (e.g. child trailer, child back pack, child seat or similar). Normal used strapping in child carriers use buckles similar to the ones used for backpacks. These can be tightened by pulling a strap end and releasing by lifting the buckle. However, this does not work as easily when the parent is releasing the strapped child. The parent normally has to use two hands to release one strap.
- Thus, the above mentioned procedures may be inconvenient, force-exerting and time-consuming wherein a user has to use two hands.
- The present subject matter relates to a strap buckle assembly for clamping a strap.
- According to an embodiment of the subject matter, a strap buckle assembly for clamping a strap comprises a first and a second part for clamping the strap in-between. In this way, a friction force can be realized between the first and second part for clamping a strap.
- Further, the first and the second part are relatively movable to each other. This means that the first and second part can be varied such that the friction force between the first and second part for clamping the strap can be either increased or decreased. Thus, an adjustment of the friction can be realized.
- Moreover, the strap buckle assembly further comprises an operating mechanism having a spring. Preferably, the spring is arc-shaped, has a variable bending radius and comprises a first end connected to the first part of the strap buckle assembly as well as a second end connected to the second part of the strap buckle assembly. The arc-shaped form of the spring is similar to a bow. Due to the arc-shaped form the spring can move similar to a bow wherein the ends of the bow and the spring, respectively, can change their distance to each other while e.g. tensioning the bowstring and exerting a force while pushing on the convex side of the arced-shape spring, respectively. Thus, by pushing on the convex side of the spring the distance between the first and second end of the spring is increased. Consequently, a bending radius of the spring is increased. Further, the arc-shaped form of the spring induces a pretension to the spring. This means that after releasing the pushing force on the convex side the distance of the ends of the spring is decreased due to its pretension. Hence, the bending radius of the spring is reduced.
- Preferably, the first end comprises a form similar to a cylinder which easily allows a rotation of this end. Advantageously, the second end has a shape allowing no rotation (e.g. rough around the edges) when inserted into e.g. a bearing. Further, as the first and second part are relatively movable to each other and as the first end of the spring is connected to the first part as well as the second end is connected to the second part, the relative position of both parts to each other can be varied by the spring. Hence, depending on the bending radius of the spring the friction force between the first and second part for clamping a strap can be adapted.
- Preferably, the spring is a flat spring, in particular comprising a strip. Advantageously, the strip is arranged between the first and second end of the spring. This strip can be arc-shaped, thus, giving the resilient behavior to the spring. This is an easy and reliable realization for a spring comprising the features and embodiments, respectively, mentioned above.
- According to an embodiment of the present subject matter, the operating mechanism further comprises a pivoting bar. Advantageously, the pivoting bar is mounted to the spring. Thus, when moving the pivoting bar a force and bending moment, respectively, is exerted on the spring. This means that the bending radius of the spring can be adapted by the pivoting bar.
- Further, the operating mechanism is preferably configured to vary the bending radius of the spring, advantageously by moving the pivoting bar such that said first and second end of the spring are displaceable with respect to each other between a clamping position and an adjusting position. This means that a movement of the pivoting bar varies the bending radius of the spring. Thus, the spring can be positioned in a clamping position having a first bending radius and in an adjusting position having a second bending radius wherein the first bending radius is smaller than the second.
- The concept underlying this assembly is completely novel and provides various advantageous effects. In particular, according to the basic concept of the present subject matter, the present invention provides a one handed use for operation of a strap buckle assembly for clamping a strap. This is realized only by adapting the spring which connects the first and second part of the strap buckle assembly, wherein a change in the distance of the two ends of the spring move the first and second part relative to each other such that a friction force for clamping the strap in-between the two parts can be varied. This means that the friction force is variable adjustable in the present invention.
- According to an embodiment of the present subject matter, in the clamping position the first and second end of the spring are spaced in a first distance to each other and in the adjusting position the first and second end of the spring are spaced in a second distance to each other. Preferably, the distance of said first and second end of the spring in the clamping position is smaller than the distance of said first and second end of the spring in the adjusting position. Thus, the first and second part of the strap buckle assembly connected to the spring are in the clamping position relatively positioned to each other so that the strap guided between the two parts of the assembly is locked in place. Further, in the adjusting position the clamping of the clamping position is unlocked by displacing the two ends of the assembly. Consequently, this increases the distance between the first and second part of the assembly in comparison to the distance in the clamping position in which the strap is locked. Hence, an easy mechanism is realized to adapt the friction force between the first and second parts by varying a clamping force and a friction force, respectively, between the assembly's two parts.
- According to an embodiment of the present subject matter, the operating mechanism is configured to hold said first and second end of the spring in the clamping position. This is preferably realized by affecting and applying, respectively, a force to the pivoting bar which is smaller than a spring force of the spring acting to decrease the distance between the two ends of the spring. In other words, the operating mechanism exerts a force over the pivoting bar to the spring wherein this force is smaller than the force of the preferably arc-shaped spring pushing its two ends together. Thus, the spring force holds the operating mechanism and the assembly, respectively, in the clamping position in which the first and second parts clamp the strap.
- The operating mechanism is further configured to hold said first and second end of the spring in the adjusting position. This is achievable by applying a force to the pivoting bar which is higher than a spring force of the spring acting to decrease the distance between the two ends of the spring. To put it another way, the force acting on the pivoting bar increases the distance between the two ends of the spring, wherein the applied force is higher than the spring force of the preferably arc-shaped spring pushing its two ends together. Hence, the force acting on the pivoting bar holds the operating mechanism and the assembly, respectively, in the adjusting position in which the strap can be moved freely between the first and second part.
- According to an embodiment of the present subject matter, the operating mechanism is configured to decrease the bending radius of the spring in the clamping position. This can be done by applying a force to the pivoting bar which is smaller than a spring force of the spring acting to decrease the distance between the two ends of the spring.
- The operating mechanism is further configured to increase the bending radius of the spring in the adjusting position. This can be realized by applying a force to the pivoting bar which exceeds the spring force of the spring acting to decrease the distance between the two ends of the spring.
- By changing the bending radius of the spring the force acting on the pivoting bar has to be decreased or increased compared to the constant force of the spring which aims to contract the spring's ends together.
- In case of an increase of the force acting on the pivoting bar, this force is applied to the convex side of the arced-shape spring. Thus, the distance between the first and second end of the spring is increased. Consequently, the bending radius of the spring is increased.
- The other way round, in case of a decrease of the force which acts on the pivoting bar and which is applied to the convex side of the arc-shaped spring, respectively, the distance between the first and second end of the spring is decreased. Hence, the bending radius of the spring is decreased.
- Thus, an adaption of the bending radius is easily possible by adjusting a force acting on the pivoting bar and the spring, respectively.
- According to an embodiment of the present subject matter, the operating mechanism further comprises an actuating member which preferably interacts with the pivoting bar to vary the distance of the two ends of the spring and/or to apply a force to the pivoting bar. The actuating member is a further element of the operating mechanism which introduces and applies, respectively, a force to the pivoting bar.
- According to an embodiment of the present subject matter, the pivoting bar comprises two opposite end portions, wherein a first end portion is mounted to an end of the spring and a second end portion is rotatably mounted. This means that on the second end portion a relative rotation is possible. This rotation is, preferably, at the actuating member. Thus, the pivoting bar can rotate in a seat of the actuating member. Further, the first end portion of the pivoting bar is mounted to an end of the spring. This mounting is advantageously torque-proof such that a force acting on the second end portion of the bar and thus transferred to the first end portion can be applied to an end of the spring. Hence, a moment can be produced at an end of the spring. This moment is preferably oriented into an opposite direction of a moment generated by the spring which is arc-shaped to change the bending radius of the spring. Thus, the spring can be deformed.
- According to an embodiment of the present subject matter, the actuating member comprises a first end stop engaging with the first part and limiting the movement of the actuating member, preferably, in the clamping position. This delimits the movement of the actuating member. Hence, the force clamping the first and second part of the assembly can be predetermined by the position of the first end stop.
- According to an embodiment of the present subject matter, the first part comprises a second end stop engaging with the actuating member and limiting the movement of the actuating member, preferably, in the adjusting position. While limiting the movement of the actuating member the maximum force acting on the pivoting bar and thus, on the spring can be adjusted. Advantageously, in the adjusting position the force introduced to the spring by the pivoting bar interacting with the actuating member exceeds the force of the spring pushing its two ends together.
- According to an embodiment of the present subject matter the first end of the spring is pivot-mounted in a first bearing of the first part. Thus, the bearing constrains relative motion between the spring and the first part. Further, moments and forces acting on the pivoting bar can be transferred to the spring as the first end of the spring is connected to the first end portion of the pivoting bar. The first bearing gives a pivot to the pivoting bar and one end of the spring by allowing free movements in predetermined directions.
- Further, the second end of the spring is non-rotatably arranged in a second bearing of the second part. A force applied to the first end of the spring which is pivot-mounted in the first bearing of the first part of the assembly generates a bending moment at the first bearing. This bending moment is passed to the spring wherein a counter bending moment is generated at the non-rotatable second end of the spring. This counter bending moment is optimally generated due to the non-rotatable arrangement of the spring in the second bearing. A non-rotatable arrangement also ensures that no loss of forces due to friction.
- According to an embodiment of the present subject matter, the spring and the actuating member are connected to the first part on opposing ends of the first part. Thus, a bending moment can be easily generated by the actuating member acting on the spring over the pivoting bar. This means that, preferably, the pivoting bar is on its one end portion connected to the actuating member and on its other end portion connected to an end of the spring. Advantageously, the connection between the pivoting bar and the actuating member is spaced from the connection of the actuating member at the first part.
- According to an embodiment of the present subject matter, the first and the second part comprise a corrugated surface for clamping, wherein preferably the corrugated surface of the first part is substantially aligned to the corrugated surface of the second part. Thus, a friction force between the first and second part can be enhanced so that an even stronger clamping can be realized. Further, also a flat or even surface is possible.
- According to an embodiment of the present subject matter, the angle between a surface of the first or second part for clamping being opposite to each other and a horizontal is smaller than 90 degrees. Due to such an arrangement a strap conducting along the surface and the horizontal has to run across an acute angle raising the friction force because of the small bending radius of the acute angle.
- According to an embodiment of the present subject matter, wherein the spring is made of an elastic material such as plastic or metal or an alloy of metal. Because of this a variable ability is given to the spring rendering a bending radius variable.
- According to an aspect of the present subject matter, a child carrier assembly comprises a child car seat, a strap for fixing a child to the child car seat and a strap buckle assembly according to the features and embodiments, respectively, above.
- In particular, the first part of the strap buckle assembly comprises a first clamping bar for clamping the strap and the second part of the strap buckle assembly comprises a second clamping bar for clamping the strap, wherein the strap is positioned between the first and second clamping bars of the strap buckle assembly. Thus, a maze can be realized producing a friction force between the first and second part for clamping the strap. Preferably, the strap is wound around a clamping bar for enhancing the friction for clamping.
- According to an embodiment of the present subject matter, in the adjusting position the first and second clamping bars are distanced from each other such that the strap is movable. This allows an adaption of the length of the strap according to e.g. the circumference of a child's body.
- Preferably, in the clamping position the distance between both clamping bars is decreased by exerting a pull force on the strap which releases the operating mechanism from the adjusting position. Thus, the friction between the bars and the strap can be adapted and varied, respectively.
- For example, in case the child carrier assembly is used to fasten a child into a child carrier for a vehicle the strap and the assembly encompass the child with the carrier. Thus, in the space of the strap the length of the strap is restricted to the child's body circumference. Thus, if the assembly is in the adjusting position and the length of the strap is adapted to the circumference of the child's body, a force acts on the first clamping bar pulling the bar into the direction of the second clamping bar.
- This force brought up by a user of the assembly can bring the assembly from the adjusting position back to the clamping position in which the clamping bars of the first and second part clamp the strap.
-
- Figure 1
- shows the strap buckle assembly in a three-dimensional exploded assembly drawing according to an embodiment;
- Figure 2a
- shows a sectional view of the strap buckle assembly according to an embodiment in a clamping position;
- Figure 2b
- shows a sectional view of the strap buckle assembly according to an embodiment between a clamping and an adjusting position;
- Figure 2c
- shows a sectional view of the strap buckle assembly according to an embodiment in an adjusting position;
- Figure 3a
- shows in a three-dimensional view the strap buckle assembly according to an embodiment in a clamping position;
- Figure 3b
- shows in a three-dimensional view the strap buckle assembly according to an embodiment in an intermediate position; and
- Figure 3c
- shows in a three-dimensional view the strap buckle assembly according to an embodiment in an adjusting position;
- In the following an embodiment of the present subject matter is explained based on the drawings. It is noticed that the drawings show a specific embodiment as explained below and further alternative modifications as specified in the description are at least in part not illustrated. Further, same reference signs used in the Figures denote same components.
- An embodiment of a
strap buckle assembly 1 for clamping astrap 2 of the present subject matter is shown inFigure 1 in a three-dimensional exploded assembly drawing embodiment before assembling the different parts. - The
strap buckle assembly 1 comprises afirst part 3, asecond part 4 and anoperating mechanism 5 having a pivotingbar 5a, aflat spring 5b and abutton 5e as an actuating member. - The
flat spring 5b comprises afirst end 5c and asecond end 5d between which a flat strip is arranged extending in a longitudinal direction. Thefirst end 5c is formed like a cylinder allowing a rotation of this end around the cylinder axis. On the contrary, thesecond end 5d is rough around the edges so that a clamp allowing no rotation to this end is realized. - Further, the flat strip and the
flat spring 5b, respectively, is arc-shaped and, thus, has a bending radius R1. The spring is also made of an elastic material such as plastic, metal or an alloy of metal (e.g. spring steel) so that a variable ability is given to the flat spring rendering the bending radius variable. - At the
first end 5c of theflat spring 5b the pivotingbar 5a is mounted. It is also possible that theflat spring 5b and the pivotingbar 5a are integrally formed and molded, respectively. In the present embodiment theflat spring 5b and the pivotingbar 5a are connected to transfer forces from the bar to the spring and vice versa. Here, the connection is torque-proof such that a force acting on the bar can be applied to the spring and, of course, the other way round. - The pivoting
bar 5a comprises twoopposite end portions 5a-1, 5a-2. Thebar 5a is mounted with thefirst end portion 5a-1 to thefirst end 5c of theflat spring 5b wherein thesecond end portion 5a-2 is rotatably mounted at thebutton 5e (seeFigure 2a ). For the sake of an easy rotation of the bar at thebutton 5e the second end portion is rounded. - The
second part 4 is formed like a picture frame having a rectangular shape wherein the frame comprises a clearance in which theflat spring 5b is positioned. Within the frame of the second part and at the inside of the frame, respectively, asecond bearing 9 is arranged. This bearing comprises two parts one opposite to the other wherein the parts are positioned inside the frame. This two-partedbearing 9 receives thesecond end 5d of theflat spring 5b. The bearing and thesecond end 5d of the spring formed like amale end 5d fitting into afemale bearing 9 such that a moment acting on theflat spring 5b leads to no rotation of the second end within thesecond bearing 9. In other words, thesecond end 5d is non-rotatably arranged in thesecond bearing 9. Thus, a bending force and moment, respectively, acting on thespring 5b cannot pivot thesecond end 5d in thebearing 9. - Adjacent to the bearing 9 a socket 13 is arranged on the inside of the frame of the
second part 4. The socket 13 comprises twoslots - This male connection counterpart is formed on two opposite sides of the
button 5e having twoprotrusions button 5e and comprise a cylindrical shape. Thus, the socket 13 and thebutton 5e can be connected to each other wherein due to their configuration thebutton 5e can pivot on the socket 13. - Further, the
button 5e comprises afirst end stop 6 engaging with thefirst part 3 and limiting the movement and rotation, respectively, of thebutton 5e around the socket 13 and itsslots 13a, b, respectively. Thefirst end stop 6 is similar to theprotrusions 14a, b meaning integrally formed on the outside of the button and positioned on opposite sides of thebutton 5e wherein only one protrusion of theend stop 6 is shown inFigure 1 . - The
button 5e is further limited in its range of motion as the first end of theflat spring 5b also forms an end stop 7. Thus, if the button is pushed downwards meaning into the direction of thesecond part 4 thebutton 5e bumps after a certain way onto the end stop 7 limiting the movement of thebutton 5e. Consequently, as already mentioned if the button moves upwards meaning into the direction opposite to thesecond part 4, thebutton 5e and itssecond end stop 6 pushes against and engages with, respectively, thefirst part 3 limiting the movement and rotation, respectively, of thebutton 5e. - The
first part 3 is also formed like a picture frame having a rectangular shape and a clearance in its inside. In the frame of the first part and at the inside of the frame, respectively, afirst bearing 8 is arranged in which thefirst end 5c of theflat spring 5b can be positioned. In thefirst bearing 8 thefirst end 5c can be clamped similar to a male/female connection wherein thefirst end 5c comprises the male part and the first bearing comprises the female counterpart. Due to the cylinder of thefirst end 5c, that first end of theflat spring 5b can be pivot-mounted in thefirst bearing 8 of thefirst part 3. Thebearing 8 is integrally formed with the inside of the frame of thefirst part 3 and comprises a shape similar to a channeling to build mentioned female counterpart. - Further, the
first part 3 comprises an upper side directed to thebutton 5e inFigure 1 and an underside directed to thesecond part 4. On the underside of thefirst part 3 twoguides 17 are disposed which extend within the frame in a longitudinal direction parallel to theflat spring 5b. The guides 17 (Figure 1 only shows one guide 17) are formed to receive parts of the frame of thesecond part 4 extending in parallel to thespring 5e. Each guide 17 forms a slide bearing having a U-shape in which the corresponding frame part of thesecond part 4 is movable. Thus, by assembling theparts second parts 4 are relatively movable to each other in a longitudinal direction parallel to theflat spring 5b. - The first and
second parts bar strap 2 can be guided wherein the clamping bars can clamp the strap such that its positions is fixed relatively to theparts parts second part strap 2 in-between. - Further, the
button 5e comprises an overall dimension which fits into the clearance of thefirst part 3. Additionally, the first part comprises dimensions which fit the channeling and thebearing 8, respectively, into the clearance of thesecond part 4, wherein the U-shaped slide bearings and theguides 17, respectively, of thefirst part 3 encompass the portions of the frame of thesecond part 4 extending into the longitudinal direction parallel to theflat spring 5b. -
Figure 2a shows a sectional view of thestrap buckle assembly 1 according to an embodiment of the invention in a clamping position.Figure 2a additionally shows the assembly in an assembled state in which the following parts are fitted into each other and with each other. - As can be seen, the
button 5e fits with its dimensions into the clearance of thefirst part 3 wherein thefirst part 3 fits with its channeling and thebearing 8, respectively, into the clearance of thesecond part 4. - Further,
Figure 2a shows theoperating mechanism 5 having the pivotingbar 5a and theflat spring 5b with the arc-shaped strip having a bending radius R1 and the two (first and second) ends 5c, 5d of the spring 2b. - The
second end 5d of theflat spring 5b is connected to thesecond part 4 via thebearing 9 wherein thefirst end 5c is connected to thefirst part 3 via thebearing 8. Further, afirst end portion 5a-1 of the pivotingbar 5a is torque-proof mounted to thefirst end 5c of theflat spring 5b wherein asecond end portion 5a-2 is rotatably mounted at thebutton 5e. The underside of thebutton 5e comprises a groove and a seat, respectively, in which thesecond end portion 5a-2of the pivotingbar 5a is mounted such that a pivotable movement on the groove is possible but the position of thesecond end portion 5a-2 is fixed relative to thebutton 5e. - As can be further seen, the
flat spring 5b and thebutton 5e are connected to thefirst part 3 on opposing ends of thefirst part 3 which means that theflat spring 5b is connected to thefirst part 3 via the first bearing 8 (on the left end of the strap buckle assembly 1) whereas thebutton 5e is connected to thefirst part 3 viaslots 13a, b (on the right end of the strap buckle assembly 1 - wherein the connection of thebutton 5e to the first part is not shown in the sectional view ofFigure 2a ). - Further, the
flat spring 5b in the assembled state ofFigure 2a comprises a pretension which tightens the first andsecond end spring 5b together such that the bending radius R1 of theflat spring 5b tends to decrease. However, due to the connection to thebutton 5e via the pivotingbar 5a the decrease of the bending radius R1 is limited. This is because a bending moment exerted on thefirst end 5c by thespring 5b and thus caused by the spring's pretension pushes thebutton 5e into an upward direction. But because of thefirst end stop 6 the movement and rotation, respectively, of thebutton 5e in the upwards direction is limited. This is realized by engaging of theend stop 6 with thefirst part 3 wherein a distance D1 between the first andsecond end 5c, d of theflat spring 5b is obtained. After all, also a special bending radius R1 corresponds to the constant distance D1. - Summarizing the above explanations, the
second end 5d of theflat spring 5b is connected with thebutton 5e such that a force acting on thesurface 16 of thebutton 5e can be transferred to thesecond end 5d and vice versa. - Further, on the right end of the
strap buckle assembly 1 inFigure 2a clamping bars 11 and 12 are shown clamping astrap 2 in-between. The two bars of thestrap buckle assembly 1 are displaced to each other such that a friction force is produced between the strap and the bars. Thestrap 2 is guided on a pathway such that the strap winds around thefirst clamping bar 11 in a loop. In this way, a maze is realized enhancing mentioned friction force between the first and second clamping bars for clamping thestrap 2. - Further, a guiding
bar 4a integrally molded with the second part guides thestrap 2 for securing thestrap 2 and ensuring a high amount of a friction force due to the guiding. The guidingbar 4a also serves the safety as this bar ensures the clamping position wherein in comparison the a common buckle a tilting of the buckle does not change the amount of the friction force clamping thestrap 2. - The clamping
bar 11 is a component of thefirst part 3 wherein the clampingbar 12 is a component of thesecond part 4. Thus, thebars flat spring 5b of theoperating mechanism 5. - By clamping the
strap 2 mentioned friction force is generated between the clamping bars and the strap. For enhancing the friction the first and thesecond part corrugated surface corrugated surface 10a of thefirst part 3 is substantially aligned to thecorrugated surface 10b of thesecond part 4. Thus, two mainly parallel oriented surfaces of the parts and the clamping bars, respectively, clamp thestrap 2 providing such a friction force between the strap and the bars. Also, even or flat surfaces are possible. - Moreover, as can be seen in
Figure 2a , an angle between asurface second part bar 4a. - The configuration presented above is situated in a clamping position in which the pretension of the two ends 5c, d of the
flat spring 5b against each other pushes the clamping bars 11, 12 and the first andsecond part strap 2 is clamped. - Further, in the above presented configuration no force is exerted on the
surface 16 of thebutton 5e. However, in the followingFigure 2b a force F acts on thesurface 16 such that thebutton 5e moves downwards. -
Figure 2b shows a sectional view of thestrap buckle assembly 1 according to an embodiment in an intermediate position (meaning between a clamping and an adjusting position). - In this Figure a force F acts on the button's
surface 16. This force is transferred to thesecond end portion 5a-2 of the pivotingbar 5a pivoting on the mounting at the button and further to thefirst end portion 5a-1 pivoting on thefirst bearing 8. Due to the torque-proof connection the force F is converted into a bending moment acting around thefirst end 5c of theflat spring 5b. In other words, a bending moment is produced turning thefirst end 5c in the clockwise direction in thebearing 8. This bending moment is opposite directed to the moment acting on thebar 5a caused by theflat spring 5b. Then, due to the intention of thespring 5b to push its two ends together a moment is produced turning thefirst end 5c in the counter clockwise direction in thebearing 8. - If the bending moment induced by the force F exceeds the bending moment induced by the spring the distance between the first and
second end spring 5b is increased from D1 inFigure 2a to D2 inFigure 2b . Thus, the bending radius is also increased from R1 to R2. Consequently, the friction force between the clamping bars 11, 12 is reduced and decreased, respectively. - As the
first end 5c of thespring 5b is connected to thefirst part 3 and thesecond end 5d of the spring is connected to thesecond part 4 also the clamping bars 11, 12 change their relative position to each other by increasing their distance. Thus, the first andsecond part guides 17 slides with its U-shaped slide bearings on thesecond part 4. -
Figure 2c shows also a sectional view of thestrap buckle assembly 1 according to an embodiment in an adjusting position. - In this Figure,
button 5e is in contact with the end stop 7 limiting the range of motion of the button as well as of theflat spring 5b and the clamping bars 11, 12, respectively. Thus, by pushing the button downwards into the direction of thesecond part 4 thebutton 5e bumps onto the end stop 7 limiting the movement of thebutton 5e. - Further, also the button's
end stop 6 can limit the range of motion as in the adjusting position theend stop 6 abuts on theouter surface plane 15 of thestrap buckle assembly 1. In case thestrap buckle assembly 1 contacts with itsouter surface plane 15 with a human being or with an object theend stop 6 cannot be moved further than to theouter surface plane 15. - After reaching the
end stop 6 or 7 the force F acting on thesurface 16 of thebutton 5e is released. Thus, not any longer any force pushes thebutton 5e downwards. - However, the strap buckle assembly stays in the adjusting position shown in
Figure 2c . This is because of the lever rule which is realized in this embodiment similar to a toggle lever. Having the lever rule in mind, the first lever is thebutton 5e pivoting on theslots 13a, b of thesecond part 4. The second lever is the pivotingbar 5a pivoting on thebearing 8 and on thefirst end 5c of theflat spring 5b, respectively. The third lever is theflat spring 5b receiving the leverages and producing leverage due to its bending. - To put it in another way, while the
flat spring 5b produces a force pushing thefirst end 5c of theflat spring 5b to thesecond end 5d, in the adjusting position thebutton 5e pushes thefirst end 5c of theflat spring 5b in the opposite direction of thesecond end 5d of thespring 5b. - In other words, the
button 5e produces a force to the left whereas the flat spring produces a force to the right, relatively to theseond end 5d of thespring 5b. However, the force produced by the button exceeds the force of theflat spring 5b so that thestrap buckle assembly 1 stays in the adjusting position shown inFigure 2c while no force F pushes the button downwards. - The consequence of the above explanations is that in the adjusting position the distance between the first and
second end spring 5b is increased from D2 inFigure 2b to D3 inFigure 2c . Thus, the bending radius is also increased from R2 to R3. Consequently, the friction force between the clamping bars 11, 12 is decreased. - As the
first end 5c of thespring 5b is connected to thefirst part 3 and thesecond end 5d of the spring is connected to thesecond part 4 also the clamping bars 11, 12 change their relative position to each other by increasing their distance. Thus, the first andsecond part guides 17 slides with its U-shaped slide bearings onto thesecond part 4. - Summarizing the above explanations with regard to
Figures 3a to 3c , theoperating mechanism 5 is configured to vary the bending radius R of theflat spring 5b by moving the pivotingbar 5a such that said first andsecond end flat spring 5b are displaceable with respect to each other between a clamping position (shown inFigures 2a and3a ) and an adjusting position (shown inFigures 2c and3c ). - In detail,
Figure 3a shows in a three-dimensional view thestrap buckle assembly 1 in a clamping position.Figure 3a corresponds toFigure 2a . Here, the bending radius R1 of theflat spring 5b comprises its smallest amount in comparison to R2 ofFigures 2b ,3b and to R3 ofFigures 2c ,3c . Further, as already discussed before in the clamping position the clamping bars 11, 12 clamp thestrap 2 wherein the distance of the clamping bars 11, 12 to each other is shown inFigure 3a with L1. - Further,
Figure 3b shows in a three-dimensional view thestrap buckle assembly 1 in an intermediate position (meaning between the clamping and the adjusting position).Figure 3b corresponds toFigure 2b . InFigure 3b , a force F acts on thesurface 16 of thebutton 5e. This causes due to theoperating mechanism 5 a movement of the first andsecond parts Figure 3a . Associated with the amendment in the distance L of the clamping bars the friction force between thebars -
Figure 3c shows in a three-dimensional view thestrap buckle assembly 1 in an adjusting position.Figure 3c corresponds toFigure 2c . InFigure 3b , thestrap buckle assembly 1 is in the adjusting position in which the distance L between the first and second clamping bars 11, 12 is increased to L3. L3 exceeds the distance L2 ofFigure 3b . Associated with the amendment in the distance L of the clamping bars the friction force between thebars strap 2 in thestrap buckle assembly 1 is possible. Further, onFigure 3 no force F acts on thesurface 16 of thebutton 5e as the force of the button in the adjusting position exceeds the force of theflat spring 5b. - For a more simplified explanation
Figures 2a and3a , respectively, andFigures 2c and3c , respectively, are considered regarding the clamping and adjusting positions. - In the clamping position the first and
second end flat spring 5b are spaced in a first distance D1 to each other. In the adjusting position the first andsecond end flat spring 5b are spaced in a second distance D3 to each other, wherein the distance D1 of said first andsecond end flat spring 5b in the clamping position is smaller than the distance D3 of said first andsecond end flat spring 5b in the adjusting position. The other way round, the distance D3 in the adjusting position exceeds the distance D1 in the clamping position. - Further, this change in distance is realized by the
operating mechanism 5. Themechanism 5 is further configured to hold said first andsecond end flat spring 5b in the clamping position (seeFigures 2a and3a ) by applying a force to the pivotingbar 5a which is smaller than a spring force of theflat spring 5b acting to decrease the distance between the two ends 5c, 5d of theflat spring 5b. Moreover, theoperating mechanism 5 is further configured to hold said first andsecond end flat spring 5b in the adjusting position (seeFigures 2c and3c ) by applying a force to the pivotingbar 5a which is higher than and exceeds, respectively, a spring force of theflat spring 5b acting to decrease the distance between the two ends 5c, 5d of theflat spring 5b. - Considering a further aspect, the
strap buckle assembly 1 and theoperating mechanism 5, respectively, is configured to decrease the bending radius R of theflat spring 5b in the clamping position (seeFigure 2a ) by applying a force to the pivotingbar 5a which is smaller than a spring force of theflat spring 5b acting to decrease the distance D between the two ends 5c, 5d of theflat spring 5b. Moreover, theoperating mechanism 5 is further configured to increase the bending radius R of theflat spring 5b in the adjusting position (seeFigure 2c ) by applying a force to the pivotingbar 5a which exceeds a spring force of theflat spring 5b acting to decrease the distance D between the two ends 5c, 5d of theflat spring 5b. - Generally spoken, the
strap buckle assembly 1 and theoperating mechanism 5, respectively, comprises anactuating member 5e (e.g. a button) which interacts with the pivotingbar 5a to vary the distance D of the two ends 5c, 5d of theflat spring 5b and/or to apply a force to the pivotingbar 5a. - Further, to leave the adjusting position and to come back to the clamping position a force from the
strap 2 to the clampingbar 11 is transferred. - Regarding
Figure 2c , in use of a strap buckle assembly, the left end of the strap encompassing thesecond part 4 is connected to the right end of the strap encompassing thefirst clamping bar 11 of thefirst part 3. - For example, in case the
strap buckle assembly 1 and astrap 2 are used to fasten a child into a child carrier for a vehicle the strap and the assembly encompass the child with the carrier. Thus, the space in-between the strap is restricted to the child's body circumference. Thus, if the strap buckle assembly is in the adjusting position and the length of the strap is adapted to the circumference of the child's body, a force acts on thefirst clamping bar 11 pulling the bar into the direction of thesecond clamping bar 12. - This force brought up by a user of the
assembly 1 has the same direction as the spring force of theflat spring 5b pushing the first andsecond ends 5b, c together. Thus, the combination of the user's force and the spring force exceeds the force of thebutton 5e so that the button is moved upwards. Hence, the adjusting position is released and the strap buckle assembly is brought into the clamping position in which the clamping bars 11, 12 of the first andsecond part strap 2. - In summary, in a child carrier assembly comprising a child car seat, a strap for fixing a child to the child car seat and a
strap buckle assembly 1 thefirst part 3 of thestrap buckle assembly 1 has afirst clamping bar 11 for clamping thestrap 2 and thesecond part 4 of thestrap buckle assembly 1 has asecond clamping bar 12 for clamping thestrap 2. Thestrap 2 is positioned between the first and second clamping bars 11, 12 of theassembly 1. Further, in the adjusting position the first and second clamping bars 11, 12 are distanced from each other such that thestrap 2 is movable, and in the clamping position the distance D between both clampingbars strap 2 which releases theoperating mechanism 5 from the adjusting position back to the clamping position. - Summarizing all the above made explanations, the purpose of this new invention is to have a one hand operation e.g. for fastening a child into a child carrier. By pushing the
button 5e with e.g. a parent's thumb thestrap 2 is released and can slide between the clamping bars 11, 12. The parent does not have to lift thestrap 2 upwards and use two hands as with a buckle of e.g. a backpack. The pushing of thebutton 5e thus allows the strap to slide in thestrap buckle assembly 1 to make it looser, it does not release the strap completely from the assembly. - Compared to earlier solutions this is more safe, child and user cannot loosen strap that easily as with earlier systems. It is possible for a child on previous solutions to changing angle of buckle in order to loosen it, in this one it is hard for child to push the button to loosen.
-
- 1
- strap buckle assembly
- 2
- strap
- 3
- first part
- 4
- second part
- 4a
- guiding bar
- 5
- operating mechanism
- 5a
- pivoting member
- 5a-1
- first end portion of pivoting member
- 5a-2
- second end portion of pivoting member
- 5b
- spring
- 5c
- first end of the spring
- 5d
- second end of the spring
- 5e
- actuating member / button
- 6
- first end stop
- 7
- second end stop
- 8
- first bearing
- 9
- second bearing
- 10a
- surface of clamping bar
- 10b
- surface of clamping bar
- 11
- first clamping bar
- 12
- second clamping bar
- 13a
- slot
- 13b
- slot
- 14a
- protrusion
- 14b
- protrusion
- 15
- outer surface plane of the strap buckle assembly
- 16
- surface of the button
- 17
- guide
Claims (15)
- Strap buckle assembly (1) for clamping a strap (2) comprising- a first and a second part (3, 4) for clamping the strap (2) in-between,- wherein the first and the second part (3, 4) are relatively movable to each other, and- an operating mechanism (5) having a spring (5b),- wherein the spring (5b) is arc-shaped having a variable bending radius (R) and comprises a first end (5c) connected to the first part (3) as well as a second end (5d) connected to the second part (4),- and- wherein the operating mechanism (5) is configured to vary the bending radius (R) of the spring (5b) such that said first and second end (5c, 5d) of the spring (5b) are displaceable with respect to each other between a clamping position and an adjusting position.
- Strap buckle assembly according to claim 1, wherein- the operating mechanism (5) further comprises a pivoting bar (5a) which is mounted to the spring (5b), and- wherein the operating mechanism (5) is configured to vary the bending radius (R) of the spring (5b) by moving the pivoting bar (5a).
- Strap buckle assembly according to claim 1 or 2,- wherein in the clamping position the first and second end (5c, 5d) of the spring (5b) are spaced in a first distance to each other,- wherein in the adjusting position the first and second end (5c, 5d) of the spring (5b) are spaced in a second distance to each other, and- wherein the distance of said first and second end (5c, 5d) of the spring (5b) in the clamping position is smaller than the distance of said first and second end (5c, 5d) of the spring (5b) in the adjusting position.
- Strap buckle assembly according to one of the preceding claims,- wherein the operating mechanism (5) is configured to hold said first and second end (5c, 5d) of the spring (5b) in the clamping position by applying a force to the pivoting bar (5a) which is smaller than a spring force of the spring (5b) acting to decrease the distance (D) between the two ends (5c, 5d) of the spring (5b), and- wherein the operating mechanism (5) is further configured to hold said first and second end (5c, 5d) of the spring (5b) in the adjusting position by applying a force to the pivoting bar (5a) which is higher than a spring force of the spring (5b) acting to decrease the distance (D) between the two ends (5c, 5d) of the spring (5b).
- Strap buckle assembly according to one of the preceding claims,- wherein the operating mechanism (5) is configured to decrease the bending radius (R) of the spring (5b) in the clamping position by applying a force to the pivoting bar (5a) which is smaller than a spring force of the spring (5b) acting to decrease the distance (D) between the two ends (5c, 5d) of the spring (5b), and- wherein the operating mechanism (5) is further configured to increase the bending radius (R) of the spring (5b) in the adjusting position by applying a force to the pivoting bar (5a) which exceeds a spring force of the spring (5b) acting to decrease the distance (D) between the two ends (5c, 5d) of the spring (5b).
- Strap buckle assembly according to one of the preceding claims, wherein the operating mechanism (5) further comprises an actuating member (5e) which preferably interacts with the pivoting bar (5a) to vary the distance (D) of the two ends (5c, 5d) of the spring (5b) and/or to apply a force to the pivoting bar (5a).
- Strap buckle assembly according to claim 6, wherein the pivoting bar (5a) comprises two opposite end portions, wherein a first end portion (5a-1) is mounted to an end of the spring (5b) and a second end portion (5a-2) is rotatably mounted, preferably, at the actuating member (5e).
- Strap buckle assembly according to one of the claims 6 or 7, wherein the actuating member (5e) comprises a first end stop (6) engaging with the first part (3) and limiting the movement of the actuating member (5e), preferably, in the clamping position.
- Strap buckle assembly according to one of the claims 6 to 8, wherein the first part comprises a second end stop (7) engaging with the actuating member (5e) and limiting the movement of the actuating member (5e), preferably, in the adjusting position.
- Strap buckle assembly according to one of the preceding claims, wherein the first (5c) end of the spring (5b) is pivot-mounted in a first bearing (8) of the second part and the second end (5d) of the spring (5b) is non-rotatably arranged in a second bearing (9) of the first part (3).
- Strap buckle assembly according to one of the preceding claims, wherein the first and the second part (3, 4) comprise a corrugated surface (10a, 10b) for clamping, wherein preferably the corrugated surface (10a) of the first part (3) is substantially aligned to the corrugated surface (10b) of the second part (4).
- Strap buckle assembly according to one of the preceding claims, wherein the angle between a surface (10a, 10b) of the first or second part (3, 4) for clamping being opposite to each other and a horizontal is smaller than 90 degrees.
- Strap buckle assembly according to one of the preceding claims, wherein the spring (5b) is a flat spring, preferably made of an elastic material such as plastic or metal or an alloy of metal.
- Child carrier assembly comprising a child car seat, a strap for fixing a child to the child car seat and a strap buckle assembly (1) according to one of the preceding claims, wherein the first part (3) of the strap buckle assembly (1) comprises a first clamping bar (11) for clamping the strap (2) and the second part (4) of the strap buckle assembly (1) comprises a second clamping bar (12) for clamping the strap (2), wherein the strap (2) is positioned between the first and second clamping bars (11, 12) of the strap buckle assembly (1).
- Child carrier assembly according to claim 14,
wherein in the adjusting position the first and second clamping bars (11, 12) are distanced from each other such that the strap (2) is movable, and
wherein in the clamping position the distance (D) between both clamping bars (11, 12) is decreased by exerting a pull force on the strap (2) which releases the operating mechanism (5) from the adjusting position.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13178828.3A EP2832249B1 (en) | 2013-07-31 | 2013-07-31 | Strap buckle assembly for clamping a strap |
PCT/EP2014/066528 WO2015014954A1 (en) | 2013-07-31 | 2014-07-31 | Strap buckle assembly for clamping a strap |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13178828.3A EP2832249B1 (en) | 2013-07-31 | 2013-07-31 | Strap buckle assembly for clamping a strap |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2832249A1 true EP2832249A1 (en) | 2015-02-04 |
EP2832249B1 EP2832249B1 (en) | 2018-05-30 |
Family
ID=48915878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13178828.3A Active EP2832249B1 (en) | 2013-07-31 | 2013-07-31 | Strap buckle assembly for clamping a strap |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2832249B1 (en) |
WO (1) | WO2015014954A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167054A (en) * | 1975-12-03 | 1979-09-11 | Toyota Jidosha Kogyo Kabushiki Kaisha | Tongue plate device for use in seat belt system |
-
2013
- 2013-07-31 EP EP13178828.3A patent/EP2832249B1/en active Active
-
2014
- 2014-07-31 WO PCT/EP2014/066528 patent/WO2015014954A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167054A (en) * | 1975-12-03 | 1979-09-11 | Toyota Jidosha Kogyo Kabushiki Kaisha | Tongue plate device for use in seat belt system |
Also Published As
Publication number | Publication date |
---|---|
WO2015014954A1 (en) | 2015-02-05 |
EP2832249B1 (en) | 2018-05-30 |
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