FR2689003A1 - Motorized chair on wheels. - Google Patents

Abstract

A motorized chair on wheels comprises a body (1) supported on a vertical shaft (2) at the geometric center of a frame (14), two driving wheels (5, 6) connected to the frame at two opposite locations of its transverse axis, two free wheels (3) connected to the frame at two opposite locations on its longitudinal axis, two DC motors (9, 10) mounted on the frame at two opposite sides, two reducers (11, 12) mounted between the motors and the wheels motors, a battery (13) connected to the motors and controlled by a lever (22) arranged on an armrest (21) of the chair. The control (22) causes the chair to move forward or backward, or rotate around the vertical shaft.

Description

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  The present invention relates to a chair on wheels and, more particularly, a motorized chair, provided with wheels, comprising two driving wheels on two opposite sides and two free wheels on two opposite ends, and the direction of which is driven by DC motors. and gearboxes by means of a control device The chair can rotate

  with an extremely short radius of gyration.

  We know and widely use chairs with wheels Figure 1 shows the arrangement of the wheels on the chassis of a chair according to the prior art As shown, the chair has two drive wheels arranged on each side and close to the rear end of the chassis, as well as two free wheels arranged on each side near the front edge of the chassis As this chair needs a long radius of gyration when you want to rotate it, it is difficult to make a half tower in a narrow space Also, as the center of gravity of the chair is distant from the center of the geometric center of its frame, it will pull the front end of its frame when it rotates and, therefore, it is not stable when it changes

of management.

  The present invention makes it possible to eliminate the

problems just exposed.

  An object of the present invention is to provide a motorized chair, provided with wheels, which can pivot on an axis passing through its central point. The present invention also relates to a motorized chair, provided with wheels, whose center of gravity is close The geometric center of the chassis so that it is stable in terms of direction and change of direction The present invention also relates to a motorized chair, provided with wheels, which can be controlled stably so that it advances or back, or for

change its direction of movement.

  To achieve the above objects, a motorized chair is provided, provided with wheels, which is

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  consisting of a body supported on a vertical shaft at the central point of the chassis, two drive wheels connected bilaterally to the chassis at two opposite locations on its transverse axis, two free wheels connected to the chassis at two opposite locations on the longitudinal axis, two motors DC mounted on the chassis on two opposite sides, two speed reducers mounted between the DC motors and the drive wheels, a battery connected to the motors and controlled by a

  device placed on an armrest of the chair body.

  As the center of gravity of the chair is located near the geometric center of the chassis, the chair is stable when it swivels The control device allows the chair to be moved forward or backward, or to be swiveled on an axis passing through the vertical shaft A battery charger is mounted on the chassis for connection to a

  external power supply to charge it.

  The present invention will be clearly understood from the

  reading of the following description made in relation to

  the accompanying drawings, in which: FIG. 1 is a plan view of the arrangement of the driving wheels and of the free wheels on a motorized chair provided with wheels, according to the prior art; Figure 2 is an exploded view of a motorized chair, provided with wheels, according to the present invention; Figure 3 is a plan view of the arrangement of the drive wheels and freewheels on the chassis of the chair of Figure 2; and Figure 4 is an elevational view of the

Figure 2 chair.

  In Figures 2 and 3, there is shown a motorized chair on wheels according to the present invention, which comprises, in outline, a body 1, a shaft 2 for supporting the chair, two free wheels 3 and 4, two drive wheels 5 and 6, two direct current motors 9 and, two speed reducers 11 and 12, a battery 13,

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  a chassis 14, a battery charger 15, and a plate

16 chassis cover.

  The drive wheels 5 and 6 are supported bilaterally by the chassis 14 in the middle by means of axles, the axles being in the same plane as the chair support shaft 2, which is mounted on the chassis 14 in the center of its upper plane The free wheels 3 and 4 are supported respectively by the chassis 14 in the middle of its front and rear ends The DC motors 9 and 10 are mounted on the top of the chassis 14 between the chair support shaft 2 and the driving wheels 5 and 6 The reduction gears 11 and 12 are respectively coupled to the output shafts (not shown) of the motors 9 and 10 and engaged with driven gears (not shown) of the driving wheels 5 and 6 The battery 13 is mounted on the chassis 14 at a suitable location and electrically connected to the motors 9 and 10 The battery charger 15 is also mounted on the chassis 14 and electrically connected to the battery 13 external DC power supply can be connected to the battery charger 15 to charge it. The chair support shaft 2 has an upper flange 17 to support the body 1; the flange 17 has a multitude of holes 18 which are traversed by screws 19 for their insertion into holes (not shown) made on the lower edge of the body 1, which allows this body to be fixed to the shaft 2 The chassis cover plate 16 has practically the shape of an arc having a rear end articulated on the rear end of the chassis 14 and a front end detachably connected to the front end of the chassis by a connection element 23 En in addition, the chassis cover plate 16 has a central hole 20 for the insertion of the shaft 2 of the chair support The body 1 of the chair comprises

  a control lever 22 on one or the other armrest 21.

  The lever 22 is electrically connected, respectively, to the motors 9 and 10 by electric wires (not shown)

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  for phase control By changing the phase of the current introduced into motors 9 and 10, these are caused to rotate clockwise

or in reverse.

  The operation of the present invention is fairly simple and explained below. By means of the control lever 22, the motors 9 and 10 are caused to rotate clockwise or counterclockwise. The rotation of the motors 9 and 10 has the effect that the reducers 11 and 12 rotate the drive wheels 5 and 6 forwards or backwards depending on the command given by the lever 22 As the center of gravity of the chair on wheels is located at right of the shaft 2 of its support, that is to say in the center of the frame, the chair can rotate by an angle of 360 on its axis, namely the support shaft (see Figure 4) Consequently , the chair can pivot with a very short radius of gyration As the center of gravity of the chair is located in the center of the frame 14, it is kept balanced and stable when its direction of change is changed. As just described, the present invention provides a motorized chair on wheels which is stable in its direction and which can swivel conveniently.

in a narrow area.

  The present invention is not limited to the exemplary embodiments which have just been described, it is on the contrary susceptible of variants and of

  modifications which will appear to those skilled in the art.

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Claims (4)

  1 Motorized chair on wheels comprising a chassis (14) supported on two drive wheels (5, 6) and two free wheels (3, 4), two DC motors (9, 10) mounted on the chassis to drive the drive wheels by means of two reducers (11, 12), a direct current supply (13) connected to the motors, and a chair body (1) supported on a shaft (2) above the chassis, characterized in that : the chair support shaft (2) is mounted vertically on the chassis at the point of intersection of its longitudinal axis and its transverse axis; the motors are mounted respectively on the chassis at the two opposite sides between the chair support shaft (2) and the drive wheels (5, 6), the motor shafts being coupled to the wheels by the reducers (11, 12) ; the wheels (5, 6) are connected bilaterally to the chassis (14) at two opposite locations on its transverse axis; and the freewheels (3, 4) are connected to the   chassis at two opposite places from its longitudinal axis.   2 Chair according to claim 1, charac-   terized in that the chair support shaft (2) has an upper flange (17) at its top to support the body (1) of the chair, the flange having holes (18) for the passage of screws ( 19) to be inserted into holes in the body of the chair.   3 Chair according to claim 1, charac-   characterized in that its body (1) comprises a control means (22) on one of its armrests (21) for controlling the phase of the electrical supply to the motors (9, 10) so as to rotate them in the   clockwise or counterclockwise.   4 Chair according to claim 1, charac-   terized in that the power supply (13) is a battery   connected to a charger (15) mounted on the chassis (14).   a 6 2689003 Chair according to claim 1, characterized in that the frame is covered with a plate (16), this plate being arranged below the body (1) of the frame and having a central hole (20) for insert the chair support shaft (2).