FR2609891A1 - WHEEL HOLDER FOR WHEELCHAIR OR SIMILAR - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS WHEEL SUPPORTS FOR WHEELCHAIRS OR SIMILAR. THE WHEEL SUPPORT ACCORDING TO THE INVENTION IS ESSENTIALLY CHARACTERIZED BY THE FACT THAT IT CONSISTS OF A PLATE WITH FOUR FIXING POINTS 11-14, AT THE TOP OF A RECTANGLE, FOUR FIXING HOLES 21-24 OF A SHAFT OF ROTATION OF A WHEEL, THESE HOLES BEING LOCATED TWO BY TWO RESPECTIVELY ON AXES 25, 27 PARALLEL TO ONE 15, OF THE TWO AXES 15, 16 WITH SYMMETRY OF THE RECTANGLE AND SYMMETRICAL WITH RESPECT TO THIS AXIS, THE CENTERS 28, 26 OF TWO ORIFICES 21, 22 LOCATED ON A SAME AXIS AND ARE RESPECTIVELY DISTANCE FROM ONE OF THE SIDES OF THE RECTANGLE PERPENDICULAR TO THIS AXIS OF A VALUE "B" AND "B2X", THE CENTERS 30, 29 FROM THE TWO OTHER ORIFICES 24, 23 BEING RESPECTIVELY DISTANT FROM THIS SAME SIDE OF “BX” AND “B3X”, CENTER 26 DISTANT FROM “B2X” BEING ITSELF DISTANCE FROM THE OTHER AXIS OF SYMMETRY OF THE RECTANGLE OF “X8”. APPLICATION: ADJUSTING THE POSITION OF THE SHAFT OF A WHEELCHAIR WHEEL IN SIXTEEN POSSIBLE POSITIONS WITH ONLY FOUR FIXING HOLES.

Description

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  WHEEL HOLDER FOR WHEELCHAIR OR SIMILAR

  The present invention relates to wheel supports for wheelchairs or the like, and more particularly wheelchairs for disabled persons wishing to practice a sport such as, for example, tennis,

basketball, etc ...

  Indeed, there is a growing number of people with physical disabilities who practice a sport, for example athletics, tennis, etc ... To allow them to practice these sports in the best possible conditions, he has special wheelchairs, especially more robust, more maneuverable,

  especially a lower center of gravity than conventional chairs.

  In addition, to get the best performance, especially in speed

  displacement and change of direction, systems had to be

  mes to adjust the position of the seat of each chair relative to the wheels, and more specifically to the large propulsion wheels. It has already been realized wheel axle supports that can take several positions to adjust the seat relative to the wheels. But these supports do not have a simple structure and do not allow to obtain a fairly fine adjustment of

different positions possible.

  Also, the object of the present invention is to provide wheel supports for wheelchairs or the like, which make it possible to overcome the

  disadvantages mentioned above, by allowing a fine adjustment, that is to say

  say a plurality of possible positions very close to each other,

  while having a simple structure.

  More specifically, the subject of the present invention is a wheel support for a wheelchair structure or the like, characterized in that it consists of a plate comprising at least two fixing points able to cooperate with two complementary points of the wheelchair. said structure, these two points being located on a first axis and spaced from each other by a determined value "d", at least four first, second, third and fourth fixing orifices of a rotation shaft of a wheel, these orifices being located two by two respectively on the second, for the

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  first and second orifices, and third, for the third and fourth orifices, axes, said second and third axes being distant from each other;

  the other of a determined value "c", parallel to said first axis and symmetrically

  each other relative to a fourth axis, the distance separating each center of said four orifices from a fifth axis passing through one of said two fixing points and perpendicular to said first axis being equal to "b + nx "o" b "is a given value," x "is four times a given setting step" p ", and" n "is one of the numbers 0, 1, 2, 3 assigned respectively to the first, third, second, fourth hole, the center

  said second port being spaced "x / 8" from a sixth axis perpendicular to

  re auditing the first axis and passing through a midpoint located equidistant

both said fixing points.

  Other features and advantages of the present invention appear

  in the following description given next to the drawings

  appended by way of illustration but in no way limiting, in which - Figure 1 very schematically shows a wheelchair structure realization for sports competition, and - Figures 2A to 2D represent an embodiment of a

  wheel support for wheelchair structure according to the invention.

  FIG. 1 very schematically represents a wheelchair structure 1 intended more particularly for sports competition,

  with two wheels at the front 3 and two large wheels 4 at the rear.

  The large wheels 4 can be fixed in known manner by their rotation shaft 5, by snapping into the orifices 6 studied for this purpose. These orifices 6 are generally made in removable support plates 8 which can be fixed to the wheelchair structure by any means,

  for example bolts-nuts 9 adapted to cooperate with breakthroughs, still

  holes, etc., made in the support plate 7.

  FIGS. 2A to 2D show an embodiment of a wheel support 8 capable of being fixed on a wheelchair structure 2 such as

  shown schematically in Figure 1 ..

  The support 8 consists of a plate 10 advantageously metallic, of rectangular or substantially rectangular shape, and a thickness

  relatively homogeneous but sufficient to give it good rigidity.

  This plate 10 comprises at least two fixing holes, and advantageously

  four holes 11, 12, 13, 14 regularly distributed at the vertices of a rectangle contained in the one formed by the plate 10. Schematically, they

  are therefore symmetrically distributed in relation to the two axes of symmetry.

  15 and 16 of this rectangle, perpendicular axes and concurrent in the center 17 of this rectangle. For example, the two holes 11 and 12 are located on a

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  axis 18 parallel to the axis of symmetry 15 and are spaced apart by a value "d" representing the length of the rectangle. The other two holes 13 and 14 are located on an axis 19 symmetrical about the axis 18 with respect to the axis 15 and are also distant from "d", the two axes 18 and 19 being distant from a value

  "a" representing the width of the rectangle.

  This plate structure with four fixing holes 11-14 therefore allows

  attaching said plate to the wheelchair structure by bolts

  nuts arranged at the four corners of a rectangle having "a" and "d" as side dimensions. In addition, the plate can be positioned in four possible ways by rotations around the two axes of symmetry 15 and

  16. These four positions are illustrated in Figures 2A-2D.

  As mentioned above, the plate 10 of the support 8 has attachment orifices 6 of a rotating shaft 5 of a large wheel 4 of a wheelchair. In the embodiment according to FIGS. 2A to 2D, the plate 10 has four orifices 21, 22, 23, 24, of a diameter adapted to receive said rotation shaft 5. They are made in the plate so that the centers 28, 26, two orifices 21, 22 are located on an axis 25 parallel to the axis of symmetry 15 and that the centers 29, 30 of the two orifices 23, 24, are located on an axis 27 parallel to the axis 25 and symmetrical of this axis 25 with respect to the first axis of symmetry 15 of the plate, so that these two axes 25 and 27 are distant from "c" below the dimension "a"

  mentioned above but taking into account the dimensions of the holes 21-24.

  In addition, the centers 28 and 26 are respectively distant from the axis 36

  passing through the centers of the two fixing holes 11 and 14, and therefore

  to the axes 18, 25, 15 ..., of a given value "b" and determined as a function of the length "d" mentioned above, and of a value "b + 2x", "x" being a value equal to four times a step "p" of the position of the big

  wheel 4 with respect to the structure of the wheelchair.

  The center 26 of the orifice 22 is located such that it is at a distance from the second axis of symmetry 16 of the plate equal to one-eighth of the value "x" defined above. In this case, the value "b" is then defined in

  function of "d" by the relation: 8b + 15x - 4d = 0.

  As for the centers 30 and 29, they are respectively distant from the axis 36

  of a value equal to "b + x" and "b + 3x".

  Consequently, the four ori ices taken in this order: first orifice 21, third orifice 23, second orifice 22 and fourth orifice 24, are spaced from axis 36 by a value equal to "b + nx", "n "being equal to one of the digits-0, 1, 2, 3 assigned to the four orifices taken

in the order defined above.

  Thus, with such a wheel support structure including the

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  four orifices defined above, it is possible to obtain sixteen positions

  distributed in equal numbers on the two axes 25 and 27, that is to say eight posi-

  possible on each axis and regularly spaced by a given "p" step. Indeed, Figure 2A illustrates the first two positions on each

axis 25 and 27.

  If the plate is rotated 180 degrees around its

  first axis of symmetry 15, two new posi-

  2B, due to the symmetry of the two axes 25 and 27 with respect to the axis 15 and the offset of the different centers with respect to the second axis of symmetry 16. In FIG. 2B, are shown in FIG.

  thus illustrated four possible positions on the two axes 25 and 27.

  If, from the position illustrated in FIG. 2B, the plate is rotated 180 degrees about the second axis of symmetry 16, two new positions of the orifices on each axis 25 and 27 are obtained, shown in solid lines on Figure 2C which represents six positions

possible on each of the two axes.

  Finally, if, from this position of the plate, it is subjected to

  In another 180 degree rotation about the first axis of symmetry 15, two other possible positions for the orifices on each are obtained. of the two axes 25 and 27 such as those illustrated in solid lines in Figure 2D which therefore represents all the possible positions of the orifices, in total eight

on each of the two axes.

  On each axis, the possible position of each center of an orifice is distant from the next by a step "p" equal to one quarter of the value "x" defined

  above, which is easily demonstrable.

  In fact, the Applicant has made a support whose values were the following: - a = 40 mm; b = 25 mm; d = 100 mm; c = 25 mm; x = 28 mm p = x / 4 = 7 mm;

  the diameter of the orifices 21-24 being of the order of 16.2 mm.

  It has thus been able to obtain two series of eight possible positions over a distance of 56 mm, each series being arranged on an axis distant from the other by 25 mm. The structures according to the prior art, for the same distance, offered only two or three possibilities for the position of each wheel by

  report, for example, to the seat of the chair.

  The structure of the wheel support according to the invention therefore allows a very fine adjustment of the position of the rotation shaft of each wheel by

  compared to the seat of the wheelchair, despite its extreme simplicity.

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Claims (6)

R E V E N D I C A T IONS   1. Wheel support for a wheelchair structure or the like,   CHARACTERIZED BY THE FACT THAT it consists of a plate (10) comprising   at least two fixing points (11-14) capable of cooperating with two complementary points of said structure, these two points being located on   a first axis (15, 18, 19) and distant from each other by a predetermined value.   born "d", at least four first, second, third and fourth fixing holes (21, 22, 24, 23) of a rotation shaft of a wheel, these orifices being located two by two respectively on the second ( 25), for the   first and second openings, and third (27) for the third and fourth   me orifices, axes, these said second and third axes being distant one of   the other of a determined value "c", parallel to said first axis and symmetrically   each other with respect to a fourth axis (15), the distance between   each center (28, 30, 26, 29) of said four orifices of a fifth axis (36) passing through one of said two attachment points and perpendicular to said first axis being equal to "b + nx" o "b "is a given value," x ", is four times a given setting step" p ", and" n "is one of the numbers 0, 1, 2, 3, assigned respectively to the first (21), third ( 24), second (22), fourth (23) orifice, the center of said second orifice being spaced "x / 8" from a sixth axis (16) perpendicular to said first axis and passing through a midpoint located equidistant from two so-called fixing points. 2. Support according to claim 1, CHARACTERIZED BY THE FACT THAT   said two attachment points are defined by at least two holes.   3. Support according to claim 2, CHARACTERIZED BY the fact that said holes are four in number (11, 12, 13, 14) arranged at the vertices of a long-side rectangle "d" and small side "a" and whose   axes of symmetry are said fourth and sixth axes (15, 16).   4. Support according to claim 3, CHARACTERIZED BY THE FACT THAT the distance "c" between said two second and third axes (25, 27)   is less than the value "a" of said pet: t side of said rectangle.   5. Support according to one of the preceding claims, CHARACTERIZED   BY THE FACT THAT said first and fourth axes are merged.   6. Support according to one of the preceding claims, CHARACTERIZED   BY THE FACT THAT said values "a", "b", "c", "d", "p", "x", are   respectively equal to 40 mm, 25 mm, 25 mm, 100 mm, 7 mm, 28 mm.