if we refer in the first place to fig1 a and 1b , we see that the practical embodiment of the system for exercising the lower limbs advocated here consists of a housing or motor - driven base 1 , on which are mounted , with the option of longitudinal sliding , a pair of support surfaces 2 , suitable in shape and size to take the users feet , moving longitudinally and in opposing directions in accordance with the arrows referenced with 4 , for which purpose and by way of the respective connecting rods 5 , linked hingedly at 6 to the mid - point of the support surfaces 2 are connected by respective toothed wheels 7 , mounted with rotational freedom by way of their shafts 8 on the actual base or housing 1 , toothed wheels 7 to which the connecting rods 5 are linked by way of an eccentric pivot 9 , the two toothed wheels 7 corresponding to the two support surfaces 2 being furthermore joined together by means of an intermediate pinion 10 , which is what receives the movement of the corresponding motor , not represented in the drawing and which supplies rotational movements to the wheels 7 in the opposite direction in order to achieve alternating movements at the support surfaces 2 of an extent close to the diameter of the wheels 7 and in opposite directions . the layout described is basically repeated in the practical embodiment represented in fig2 a and 2b , in which there is a single support surface 3 for both feet , with the evident difference that in this case there will be a single connecting rod 5 and a single wheel 7 as well , which in this case will not be toothed and which will receive the movement directly from the motor by way of its own shaft 8 . in fig3 a and 3b another embodiment version is represented in which two support surfaces 2 participate , as in the case of fig1 a and 1b , although in this case the support bases 2 linked to respective supports 13 which are moved by a pair of transverse drive axles 11 and 12 , provided at their wheel ends with eccentric pivots 14 and 15 , whereby , in addition to the same longitudinal movement as in the case of fig1 a and 1b , a vertical movement is achieved between the end situation shown with a continuous and dotted line in the lateral view in this fig3 a and 3b . with the participation also of two support surfaces 2 , the embodiment of fig4 a , 4b and 4 c envisage the existence of a single motor - drive transverse shaft 16 terminated at each end with a wheel provided with respective opposing lugs 17 , by way of which movement is transmitted to the support surfaces 2 relatively close to one of their ends , while their other end rests on the actual motor - driven base 1 by way of sliding supports 18 , so that an upward / downward rocking movement of one of the ends of each support surface 2 is achieved , while the other end is kept at a constant height level , in parallel to a horizontal movement of the support surface . in the embodiment in fig5 a , 5b and 5 c similar movements are achieved to those obtained in fig4 a , 4b and 4 c , but more extensive in the horizontal or longitudinal movement of the support surfaces 2 , for which purpose the structure of the embodiment in fig1 a and 1b is repeated , as regards the existence of the hinged pivots 6 , the toothed wheels 7 and the drive pinion 10 , but with the exception that in this case the swivel pivots 6 can rock sideways , for example by means of a cardan drive or 90 °- hinged rocker arm , where the base or housing 1 has a ramp 19 and each support surface 2 has a pair of longitudinally spaced lower lugs 20 and 21 , the pivot being designed to coincide with the ramp 19 in order to make the support surface 2 rock , as represented in the two side elevational views in the afore - mentioned fig5 a , 5b and 5 c . in the embodiment shown in fig6 a and 6b , in which also two support surfaces 2 participate , each of the support surfaces 2 is connected to the housing or base 1 by means of two pairs of connecting rods 31 , hinged at their ends 32 both to the support surface 2 and to the housing 1 , as may be seen especially in the side view , there being linked to the mid - point of the foregoing connecting rods 31 and also hingedly a drive rod 33 , which is linked hingedly to a cross - arm 34 , rocking on the housing 1 at its mid point 35 and extended in a short arm 36 by which both drive rods 33 receive an opposing alternating movement from a drive wheel 37 provided with an eccentric pivot 38 for transmitting movement to a short rod 39 linked to the arm 36 . in this case the drive system described supplies a rocking movement to the connecting rods 31 , equivalent to a longitudinal and horizontal movement of the support surfaces 2 , which is combined with a raising and lowering movement , also generated by the actual rocking of the connecting rods 31 . in an embodiment version shown in fig7 a and 7b , on the motor - driven base 1 , in respect of which the support surfaces 2 have to be mobile , a pair of vertical shafts 40 - 41 are established , aligned longitudinally and centrally , on each of which an arm 42 - 43 is mounted , these arms 42 - 43 being parallel and identical and joined hingedly at their free end 44 to respective pivots 45 integral with the under side of the support surfaces 2 , forming with the latter a deformable quadrilateral in which the rocking of these arms 42 - 43 causes a longitudinal movement of the surfaces 2 in the same plane , as may be seen in any of the figures and in accordance with the arrows represented in them . this rocking movement of the arms 42 - 43 is carried out specifically on the arm 42 to which a connecting rod 47 , which links the arm 42 to the drive wheel 49 eccentric 48 , is attached hingedly by way of a swivel pivot offset in relation to the shaft 40 . moving on now to the practical embodiment of fig8 a , 8b and 8 c , in it and on the motor - driven base there are established a pair of supports 50 which , for instance with the aid of bearings , form supports for a longitudinal shaft 51 with which a transverse support 52 is integral , being integral in turn with the support surfaces 2 , so that an angular rocking movement of the shaft 51 causes a lateral rocking movement with parallel raising and lowering of the support surfaces 2 , which are shown by the two side elevational views of the aforesaid fig8 a , 8b and 8 c . in order to achieve this rocking , the shaft 51 is terminated at one of its ends with a small radial extension 53 to which is attached hingedly the arm 54 which connects the shaft 51 to the drive wheel 56 eccentric 55 , so that the rotational movement of the wheel 56 becomes an angular rocking movement of the shaft 51 , which in turn is converted into the aforesaid rocking movement for the support surfaces 2 . going on now to analyze the practical embodiment shown in fig9 a , 9b and 9 c , relatively similar to that of the previous figures , in it with the shaft 51 that receives the movement of the drive wheel 56 there collaborates a second shaft 57 , parallel and below the shaft 51 , mounted like the former on supports 50 ′, somewhat higher than those in the previous case , so that with these shafts 51 and 57 there are associated respective transverse and parallel arms 58 and 59 , which are connected hingedly at their ends 69 to vertical arms integral with the under side of the support surface 2 , the arms 58 , 59 and 61 forming a deformable parallelogram which keeps the arms 61 vertical all the time , permitting their vertical movement , as shown in the two side elevational views in the above - mentioned fig9 a , 9b and 9 c , i . e . a vertical alternating movement of the a support surfaces 2 is achieved with the action of the drive wheel 56 , in which these are kept horizontal all the time . in the embodiment in fig1 a , 10b and 10 c , a single support surface 3 is established on the motor - driven base , although obviously there could be two surfaces , specifically the surface being provided with a transverse eccentric shaft 62 , mounted on end supports 63 , the shaft 62 with which there is integral a lower radial arm 64 , which is attached hingedly at its free end 65 to a longitudinal connecting rod 66 , which is attached hingedly at its other end to the drive wheel 68 eccentric 67 , so that in this case the rotational movement of the drive wheel 68 is converted into a rocking movement of the arn or extension 64 of the support surface 3 and consequently into a longitudinal rocking movement of the former , between the limit situations shown in the two lateral views of the afore - mentioned fig1 a , 10b and 10 c . in fig1 a and 11b it may be seen that on the motor - driven base 1 in relation to which the support surfaces , composed in this case of a transverse bar 89 and a tubular casing 90 , which turns freely in respect of the bar 89 , have to be mobile , two supports 82 are established , arranged parallel to each other and adjacent to the sides of the aforesaid base 1 and matching up with one of the ends of same , between which supports 82 are mounted two arms 83 , one which is attached by way of one end 4 with a connecting rod 85 , which is hinged at the other end by means of an eccentric 86 on a rotating wheel 87 , as a driving element which is naturally operated by a motor not shown . the arms 83 are mounted on a rotating shaft 88 established between the side supports 82 , so that the bar 89 with its casing 90 is located between the opposite end of those arms 83 . in this way , the rotational movement of the wheel 87 produces the rotational and sliding movement of the connecting rod 85 , transmitting the movement to the arms 83 and thereby to the shaft 88 , causing the bar 89 mounted between the arms 83 to effect and back and forth movement , as shown by the arrows represented in the side elevational view in fig1 a , 11b , 12 a and 12 b . this continuous to and fro movement by the bar 89 and therefore by the feet resting on it , will describe a small are , which will be formed by the turning of the arms 83 on the shaft 88 . fig1 a , 13b , 14 a and 14 b show an alternative embodiment so that , instead of being longitudinal to and ho , the movement is rocking up and down , so that in this case the components are the same , with the only exception that the arms are determined by the two sections 83 ′ and 83 ″ in order to make the sections 83 ″ rock up and down as shown in the side elevational views in fig1 a , 13b , 14 a and 14 b . both the movements described and the means for obtaining them are merely informative and any other kind of conventional drive transmission means may be used without this affecting the essence of the invention in any way at all . the invention is primarily applicable in the sphere of office jobs and the like , where an operator has to remain seated during the larger part of the working day , although it may also be used in rehabilitation tasks and in any other circumstances in which similar performance is required , as is the case of collective transport vehicles on long journeys during which passengers are immobilized because of the shortage of space available . although other modifications and changes may be suggested by those skilled in the art , it is the intention of the inventors to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of their contribution to the art .
a system is provided for persons who must remain seated for extended periods of time , such as persons working in offices and the like . the system includes one or two support surfaces for the feet of the user , which are moved by a motor driven base . the support surfaces perform an alternating longitudinal movement , a lifting and lowering movement or a movement combining the two movements . the support surfaces are moved by , in one example , support rods hingedly connected to a central point of the support surfaces and at the other end to eccentric pivots allocated to respective toothed wheels which are mounted so at to rotate about their respective axis . an intermediate motor - driven pinion conveys rotational movement in the opposite direction to the wheels and are placed between the wheels . the support surfaces may be a bar that is transverse relative to the motor - driven base , which is preferably used in mass transit vehicles such as motor coaches , airplanes , etc .