FR2526311A1 - CURRENT WHEEL HAND OF A WHEELCHAIR - Google Patents

Abstract

THE INVENTION RELATES TO A HANDRAIL, WHICH IS EQUIPPED WITH A WHEEL OF A WHEELCHAIR OF PHYSICAL DISABLED, HANDRAIL OF GENERAL TORIC SHAPE AND ASSOCIATED WITH FIXING ELEMENTS 7 ON THIS WHEEL. THIS HANDRAIL IS MADE IN PLASTIC 15. ONE APPLICATION IS THE REALIZATION OF AN IMPROVED, LIGHTER AND LESS FRAGILE ARMCHAIR.

Description

Wheel handrail of a wheelchair.

  Some wheelchairs of physically handicapped persons have a "handrail", a kind of hoop fixed on one of the large wheels of the wheelchair and integral in rotation with this wheel, by means of which it is possible for the wheelchair user to move it and / or to maneuver it. The handrails known to date are realized

  metal and are, therefore, tubular, circular section.

  They have a number of disadvantages including excessive weight, fragility to shock that makes them dented in use, and a poor adaptation of their section

  circular right to a satisfactory manual grip.

  The invention intends in particular to remedy these drawbacks.

  by being thus relative to a handrail, of which is provided

  a wheelchair wheelchair wheelchair wheelchair

  of a generally toric shape and associated with fixing elements

on the wheel of the wheelchair.

  This handrail is made of plastic.

  The advantageous following provisions are, moreover, preferably adopted: said plastic material is honeycombed

  the handrail is made by expansion molding

if we;

  its section by a plane passing through the axis of revolu-

  This generally toroidal shape has an internal radial portion, an outer radial diameter, and an outer axial portion disposed between said radial inner and outer radial diameters, these various sides having the following curvatures. the portion of the internal radial portion connected to the outer axial portion, a substantially zero curvature, the outer radial side, a non-zero convex curvature, and the outer axial axis a non-zero concave curvature; The absolute value of the curvature of the outer axial side is substantially greater than, preferably twice that of the outer radial side; said sides are connected, one to the next, by rounded convex leaves; the fasteners are made integral with the handrail by being made prisoners at the time of the

molding of the plastic material.

  The invention will be better understood, and features

  and their benefits will become apparent during

  the description of an achievement given below as an example

ple.

  It is understood that the description and drawings

  are only indicative and not limiting.

  Reference will be made to the accompanying drawings, in which: Figure 1 is an elevational view of a handrail according to the invention; Figure 2 is a section on II-II of Figure 1; and FIG. 3 is a section III-III of FIG.

figure 2.

  The handrail of Figure 1 is a kind of

  plastic hoop, generally toroidal in shape

  around the axis 1 We observe the external face, that is,

  say the face that is visible when the handrail is fixed on the wheel of a wheelchair, and there are three distinct zones on this external face oriented: the inner radial face 2 to the axis 1, the outer radial face 3 to the opposite of the axis 1, and the outer axial face 4 parallel to the axis

  1, and therefore disposed transversely with respect to this axis.

  The section of FIG. 2, by a radial plane 16 containing

  nant the axis 1, makes it possible to better locate these various faces which then merge with the sides of this section. The following provisions are noted: the section is symmetrical with respect to a plane perpendicular to the axis 1;

  because of this symmetry, only the corresponding sides

  laying on the outer face are more particularly described; the side 2 extends on the upper face of the section and is substantially rectilinear; the side 3 extends on the underside and is

  a circle of radius 2 R (16 mm for a given embodiment), delimiting

  as a convex face the side 4 extends laterally and is a circle of radius R (equal to 8 mm in the embodiment mentioned above), delimiting a concave face; 6, circular, convex, connection fillets,

  connect the said sides to each other.

  Four elements 7, allowing the attachment of the hand

  the wheel of a wheelchair, are

  the handrail and are distributed at regular intervals on

  the internal axial face 8 of the handrail.

  Each element 7 comprises a shank 9 in which a tapping 10 has been formed, and two lugs 13 which extend from the end of the shank opposite to the inlet orifice 11,

  tapping perpendicular to the axis 12 of this tapping.

  The axis 12 is perpendicular to the plane 5 and placed substantially equidistant from the vertices 14 of the upper fillet connecting

  the two upper sides 2, and, on the lower side 3, and, equally,

  substantially in the middle of the inner axial face 8.

  The handrail is made by molding, in an expanded plastic material. Before molding, each fastening element 7 is put in place, so that at the time of molding, the tabs 13 and part of the drum 9 are embedded in the mass.

  plastics which are expanding and remain

  Nières. The main advantages of the described realization are the following -4 -

  the handrail is light because the plastic material

  15 is expanded, the handrail does not deteriorate by cabossage, because it has the plasticity that gives it its material, obviously, it does not rust, but can also be tinted in any desired color, the shape of its section can to be chosen to be

  perfectly adapted to the requirements of a good manual grip-

  the, and this, whatever the user (child, adult, old), the final establishment of the fasteners 7 by the molding operation itself is very simple and very safe.

  The invention is not limited to the embodiment

  on the contrary, it covers all the variants that could be made without departing from its

his mind.

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Claims (7)

R E V E N D I C A T I 0 N S   1 Handrail, which is equipped with a wheel of a   wheelchair of a physically disabled person, a general-purpose handrail   O-ring and associated with fastening elements (7) on said wheel of the chair, characterized in that it is made of plastic (15).   2 handrail according to claim 1, characterized   in that said plastic is honeycombed.   3 Handrail according to any one of the claims   1 and 2, characterized in that it is made by molding by expansion.   4 Handrail according to any one of the claims   1 to 3, characterized in that its section by a plane (16) passing through the axis of revolution (1) of said general form   ring has an inner radial side (2), an outer radial side   No. 3, and an outer axial side (4) disposed between said inner radial and outer radial sides, these various sides having the following curvatures: the portion (2) of the inner radial piece connected to the c 8 tee external axial axis (4), a substantially zero curvature, the outer radial side (3), a non-zero convex curvature, and the outer axial axis (4), a concave curvature not zero.   5 handrail according to claim 4, characterized   in that the absolute value of the curvature of the outer axial side (4) is substantially greater than, preferably double   that of the outer radial side (3).   6 Handrail according to any one of the claims   4 and 5, characterized in that said sides are connected,   one to the next, by rounded convex leaves (6).   7 Handrail according to any one of the claims   1 to 6, characterized in that the fastening elements (7) are secured to the handrail (15 being el   made prisoners at the time of molding the plastic material.