The foldable bearing structure includes a set of coplanar wheels and a folding device including a set of lower arms; at least a rear upper arm; an antiparallelogram deformable in a vertical plane, the antiparallelogram including two crossed segments; at least a first sidebar located in the vertical
The foldable bearing structure includes a set of coplanar wheels and a folding device including a set of lower arms; at least a rear upper arm; an antiparallelogram deformable in a vertical plane, the antiparallelogram including two crossed segments; at least a first sidebar located in the vertical plane; the antiparallelogram deformed by folding between a first position corresponding to an unfolded of the structure and a second position corresponding to a folded position, the transition from the first position to the second position reducing the wheelbase of the structure.
대표청구항▼
1. A folding bearing structure comprising: a set of coplanar support points including at least two rear support points and at least one front support point;at least one folding device comprising a set of lower arms comprising at least one front lower arm and rear lower arm each comprising a first en
1. A folding bearing structure comprising: a set of coplanar support points including at least two rear support points and at least one front support point;at least one folding device comprising a set of lower arms comprising at least one front lower arm and rear lower arm each comprising a first end, each being connected to one of the support points,a set of upper arms comprising at least one front upper arm and rear upper arm,a first antiparallelogram deformable in a vertical plane, said first antiparallelogram comprising two crossed segments with: a first end and a second end each being fixed by a first and a second attachment to a first end of the front lower arm and a first end of the rear lower arm respectively;a third end and a fourth end each being fixed by a third and a fourth attachment to a first point on the front lower arm and a first point of the rear lower arm respectively;at least one first sidebar located in a vertical plane, said first sidebar: being fixed by a fifth attachment by a first end of said first sidebar to the first end of the front lower arm;being fixed by a sixth attachment to the rear upper arm at a first upper point such that a length of the first sidebar is similar to a first segment formed by the second end and the third end of the antiparallelogram and approximately parallel to said first segment.a second sidebar, said second sidebar: being fixed by a seventh attachment by a first end of said second sidebar to the first end of the rear lower arm;being fixed by an eighth attachment to the front upper arm at a second upper point such that the length of the first sidebar is similar to asecond segment formed by the first and the fourth ends of theantiparallelogram and approximately parallel to said second segment,wherein the first antiparallelogram deforms by folding between a first position corresponding to an unfolded position of the folding bearing structure and a second position corresponding to a folded position, a change from the first position to the second position reducing a wheelbase of the structure. 2. The folding bearing structure according to claim 1, wherein the first and second sidebars form an antiparallelogram, the seventh and eighth attachments being pivot links. 3. The folding bearing structure according to claim 1, wherein each support point is located on a wheel, said folding bearing structure comprising: a first set of front wheels and a second set of rear wheels;wheel supports comprising the at least one front lower arm and rear lower arm,each comprising a first end to connect rotation axes of the wheels to the folding bearing structure. 4. The folding bearing structure according to claim 3, wherein each of the rear wheels is located in an axis substantially identical to a longitudinal axis of a front wheel except for the width of the wheels, a front wheel and a rear wheel forming the wheels on a first side and the wheels on a second side respectively of the structure. 5. The folding bearing structure according to claim 4, wherein the folding bearing structure forms a haptic system in contact on a bearing surface, such that when a rotation movement is initiated on the rear upper arms propagating towards the lower arms by means of pivot links, the wheels of said folding bearing structure under the action of firstly a rotation force of the lower arms and secondly a reaction force from the bearing surface are moved in a translation movement approximately parallel to the bearing surface. 6. The folding bearing structure according to claim 1, comprising two sides, each side being defined by a vertical plane comprising at least one separate rear support point for each of the two sides and at least one front support point, said folding bearing structure comprising two folding devices each comprising an antiparallelogram deformable in the plane of one of the sides of the structure. 7. The folding bearing structure according to claim 6, comprising a device to synchronise folding of the two folding devices. 8. The folding bearing structure according to claim 6, comprising a guide stiffener to guide the folding bearing structure when wheels of the wheelbase are in the first position. 9. The folding bearing structure according to claim 8, wherein the guide stiffener comprises a guide to guide the folding bearing structure and a folding stiffening device firstly to hold the rear upper arms at a predefined maximum distance and secondly to reduce a separation distance between the rear upper arms when a second folding is made. 10. The folding bearing structure according to claim 9, wherein the stiffening device keeps the rear arms and the rear support points in the same plane. 11. The folding bearing structure according to claim 9, wherein the stiffening device is fixed to the rear upper arms of the bearing structure and comprise eight connections fixed by pivot links comprising a first pair of isosceles quadrilaterals with the same dimensions and a second pair of isosceles quadrilaterals with the same dimensions, each of the quadrilaterals having a small side length substantially similar to the length of the large side, the quadrilaterals in the first pair, being geometrically similar to the quadrilaterals in the second pair, the eight links comprising a locking position in which the rear arms can be held at a maximum separation position. 12. The folding bearing structure according to claim 9, wherein the stiffening device comprises a plurality of sets of rods fixed to each other by pivot links and to the rear upper arms by pivot links, said sets of rods being connected by at least one antiparallelogram so as to synchronise folding of each set of rods. 13. The folding bearing structure according to claim 9, wherein the stiffening device comprises a sliding bar and a set of rods to hold the sliding bar in position between the rear arms, said rods being held to the rear upper arms by pivot links, a first set of rods being connected to the sliding bar by a sliding and pivot link and a second set of rods being connected to the sliding bar by a pivot link. 14. The folding bearing structure according to claim 9, wherein folding of at least one folding device is synchronized with folding of the stiffening device such that folding of the stiffening device causes folding of the at least one folding device. 15. The folding bearing structure according to claim 9, wherein the folding stiffening device comprises a motor to actuate folding and/or unfolding to reduce or increase the separation distance between the rear upper arms. 16. The folding bearing structure according to claim 1, wherein the first, second, third, fourth and fifth attachment of the folding device and the bearing structure are pivot links. 17. The folding bearing structure according to claim 1, wherein the front lower arm on each side of the folding bearing structure makes a first rotation movement about the first end of the antiparallelogram when changing from the first position to the second position and vice versa. 18. The folding structure according to claim 1 wherein the rear lower arm and the rear upper arm on each side of the folding bearing structure makes a second rotation movement about the fourth end of the antiparallelogram when changing from the first position to the second position and vice versa. 19. The folding bearing structure according to claim 18, wherein the folding device comprises a first synchronisation device for the first and second rotation movements. 20. The folding bearing structure according to claim 19, wherein the first synchronisation device of the first and second rotation movements is made using the sidebar. 21. The folding bearing structure according to claim 1, wherein a triangle formed by the first end of the antiparallelogram, the fourth end of the antiparallelogram and the upper point, is an isosceles triangle with its vertex at the first end of the antiparallelogram, said triangle remaining isosceles in all folded positions. 22. A supporting device comprising a folding bearing structure according to claim 1, wherein the supporting device is a pram, a folding table, a folding wheelbarrow or a trolley. 23. The folding bearing structure according to claim 1, wherein the first end of the first antiparallelogram defines a common rotation point for the at least one front upper arm, the at least one front lower arm and the at least one first sidebar. 24. The folding bearing structure according to claim 1, wherein the second end of the first antiparallelogram defines a common rotation point for the at least one rear upper arm, the at least one rear lower arm and the second sidebar.
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이 특허에 인용된 특허 (6)
Levy Isy R. (Avenida Salaverry 2650 San Isidro ; Lima PEX), Expandable and compressible carrier.
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