FR2539312A1 - Roller skate - Google Patents

Abstract

The invention relates to a roller skate. This skate comprises at least one drive wheel 2a, which can be moved positively, during the pressing of a pivoting pedal 6, from the actuating position illustrated by means of a movement-transmission mechanism 25, 26, 23, 24; when the skater raises his foot, springs 29, 30, 31 return 6 into a stand-by position, in which the skater, with the toe of his foot, can actuate a control member 15a of a brake 19a, acting on 2a. A pair of skates according to the invention may be used by means of normal walking movements, the drive effect of 6 extending each pace.

Description

The present invention relates to a roller skate

  lettes. Although it allows high travel speeds, the use of standard roller skates has a certain sporting character, which limits it,

  due to the inevitable risks, in general to persons

  nes young or having a long practice.

  The risks mentioned are obviously linked to stopping difficulties. It has certainly been imagined to provide the front part of the usual roller skates with an elastic member, which the skater can bring into contact with the ground by applying

  on the front of the skate a push with the tip of his foot.

  It is of course a very rudimentary braking means.

  keep quiet, which can even prove dangerous if the rolling of the skate is abruptly interrupted by a meeting between the mentioned elastic member and a roughness of the ground Although it does not seem impossible to imagine devices

  less random braking, especially with pro-action

  aggressive, it should be noted that repeated application of brakes of this kind by an inexperienced or cautious skater would force him each time to renew his launching effort, which would make circulation with

  such roller skates, very tiring.

  One of the essential aims of the present invention is to allow the realization of a roller skate which, on the one hand offers the possibility of progressive braking, perfectly safe in all circumstances, and which, on the other

  hand, is arranged to allow the skater to exercise

  cer with his foot a motor action on at least one of

  castors of the skate with which it is equipped, these two possibilities

  tees helping to remove any sporting character from the use of roller skates according to the present invention, which thus becomes accessible, after very brief training,

even the elderly.

  The roller skate according to the present invention is characterized in that it comprises a roller frame, on which a pedal, adapted to support the foot, is pivotally mounted around at least one transverse axis,

  between a waiting position and an operating position

  ment, reached each time the skater applies, with his heel, a push on the back of the pedal in the waiting position, a braking device, which is mounted on the chassis so as to be actuated each time the skater applies a push with the tip of his foot

  on the front of the pedal in the standby position, a device

  motion transmission, which is mounted on the

  chassis so as to be activated each time the

  neur applies, with his foot, a downward push on the pedal, making it pass from its actuation position to a depressed position, and which is coupled with at least one of the rollers, so as to exert on it a driving action at each actuation of the pedal, as well as elastic means, such as springs, for bringing the pedal back, when the skater lifts the foot,

  from its sinking position to its waiting position.

  The safety of use of the roller skate according to the present invention obviously results from the fact that, in the standby position of the pedal, the skater can at any time slow down his progress by giving a "tip stroke" on said pedal, after which, having obtained the

  reduced speed or desired stop, the skater can

  follow or resume its movement by applying to the

  pedal the skate first a "heel kick", then down

  lifting the pedal under the effect of its weight When

  à__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ O _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

  the latter reaches its maximum insertion position

  neur can then lift above the solson foot provided with the skate, by relying for this on his other foot, which can moreover be provided or not with a roller skate according to the present invention -or even possibly of a usual roller skate - As soon as the first skate has ceased to be applied to the ground, the elastic means with which it is provided brings its pedal from its depressed position

  to its standby position, and the skater can pose again

  calf said first skate on the ground, then brake in case of loss.

  In fact, it is preferable, but not mandatory, that both feet of the skater be equipped with

  roller skates according to the present invention, because the em-

  bending of such a pair of skates can then differ a lot

  blow of that of a pair of skatesusual and to appeal in particular only to the automatisms of normal walking, which is doubly favorable by reducing, on the one hand, the duration of learning to skate, and, on the other hand, the risks run by the user Indeed, if after having actuated for example the pedal of his right skate as one

  previously described it, while his left foot, also

  ment equipped with a skate according to the present invention, is raised above the ground in a normal walking movement, as soon as the skater has rested his left skate on the ground he can lift his right foot and thus allow the return of the corresponding pedal in the standby position,

  while his left foot advances the corresponding skate

  laying by means of his driving wheel or wheels, actuated by the corresponding pedal Of course, with each "step", the skater crosses a distance which is

  greater than the usual length of his step, from the

  tance on which the drive wheel of the corresponding shoe has rolled. In a preferred embodiment of the roller skate according to the present invention, a freewheel device is inserted between the movement transmission device and each drive wheel with which it

is mated.

  This embodiment is particularly advantageous, insofar as it allows an elongation

  additional of each "step" of the skater, thanks to the roller

  free of the skate after its pedal has reached the fully depressed position; of course, in the event of 2539312 l

  danger, the skater will be able to stop this ride immediately

  ment free on one foot by putting the other foot on the ground and braking the corresponding pad, the other pad can without any inconvenience be raised above the ground, or else stay in contact with it. In a particular embodiment of the invention, the pedal of the roller skate has its part

  rear connected to the chassis by at least one link,

  abutment at both ends so as to pivot freely in a vertical, longitudinal plane, between two positions,

  one front and one rear, which correspond respec-

  the standby position of the pedal and its

  actuation position; on the other hand, two elastic organs

  only deformable, such as springs, are provided, the first to bring the rod from its rear position to its front position, and the second, to return the pedal from its depressed position to its actuating position

or waiting.

  The operation of this embodiment of the invention is particularly safe insofar as each stroke of the skater's heel, which makes the articulated link pivot backwards, certainly moves the front of the pedal away from the braking device, so that the motor actuation of the pedal can take place without any risk of simultaneous actuation of the device

braking.

  According to another advantageous characteristic of

  this embodiment of the invention, the first res-

  spell can attack the motion transmission device

  ment so that, after being tensioned by the pivoting of the rod from front to rear, the relaxation of said first spring, during the insertion of

  the pedal, reinforces the motor action of the latter.

  This feature offers the advantage of storage

  somehow siner the effort corresponding to the heel kick of the skater, in the tension of the first spring,

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  this energy, thus stored, is then recovered, while depressing the pedal, to strengthen its

motor action.

  Preferably, means are provided for removably fixing, to the pedal of the roller skate according to the present invention, only the front part of the skater's foot, his heel remaining free to lift. This arrangement facilitates the use of the skates. according to the invention in "normal walking" as explained above: indeed, the skater can thus, at the end of each step, lift the heel above the skate, before lifting

  and advance the foot and the corresponding pad.

  According to another characteristic, optional but advantageous, of the roller skate 'according to the present

  invention, the drive wheel or rollers, of relative diameter

  tively large, are mounted in the middle part of ch Assis, whose front and rear parts each carry at least one crazy wheel, of equal or different diameter; On the other hand, the two planes tangent to a driving caster and, respectively, to a front caster or to a rear caster, preferably form an obtuse angle between them, differing from 180 degrees only by a few degrees or by a few tens of degrees In the case of this embodiment, each stroke of the skater's heel applies the rear wheel to the ground, which favors the movement of the skate pedal from its standby position to its actuation position. the pedal, or when it is in its standby position, each stroke of the tip, given by the skater on the front of the pedal, rotates the entire skate around the drive wheel (s) , so that the

  front castors are applied to the ground, the wheel (s)

  rear lettes being raised above the ground.

  By way of example, an embodiment of a roller skate according to the present has been described below and illustrated diagrammatically in the appended drawing.

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invention.

  Figures 1 to 3 are sectional views through

  tielle by the longitudinal, vertical plane of symmetry of the

  skate, which show its pedal respectively in its posi-

  braking, in its operating position and in

its sinking position.

  Figure 4 is a plan view, corresponding

in Figure 3.

  In the various figures of the appended drawing, 1 designates the chassis of the roller skate, which can be made up in different ways, for example in the form of an elongated beam, of small height and of small width, but strong enough to support the weight of the skater Two driving wheelsq 2 a and 2 b, having

  several centimeters in diameter, are mounted on the par-

  middle tie of the elongated frame, 1, on either side thereof; for example, an axis 3, on the ends of which the two wheels, 2 a and 2 b are wedged, pass through a transverse bearing (not shown), mounted in the chassis 1 Two idler rollers, 4 a and 4 b, are carried by the front part of the chassis 1, and two other idler rollers, 5 a and b, by its rear part In a preferred embodiment, the pairs of rollers 2 a-2 b, 4 a-4 b and 5 a-5 b are arranged so that the two planes below tangent to the middle rollers 2 a-2 b and, respectively, to the front rollers 4 a-4 b, or to the rear rollers, 5 a-5 b form an obtuse angle between them, the difference with degrees, designated by a in the figure ila a value of a few degrees, or at most a few tens of degrees Thanks to this arrangement, we see that the frame 1 of the skate can rest on the ground, designated by S, either- by its two pairs of wheels 2 a-2 b and 4 a-4 b, or by its two

  wheel pairs 2 a-2 b and 5 a-5 b, as will be described later

laughs in more detail.

  Above the chassis 1 is mounted a pedal 6, which, in the illustrated embodiment, consists essentially of a substantially rectangular plate, for example metallic, the dimensions of which are slightly greater than that required by the size of the skaters to whom the pad considered is intended On the front part of the pedal 6 are arranged fixing members

  removable from the skater's foot, which in the form of

  illustrated, were materialized by a sort of slipper -or toe-block-, 7, which retains only the front part of the skater's foot 8, whose heel, 8 a, is

  on the other hand left free to lift.

  On the other hand, the rear part of the sole 6 is connected to the corresponding part of the chassis 1, by two rods 9 a and 9 b, each of which has its articulated ends, one 9 al (FIG. 1), below from the rear of the pedal 6, and the other, 9 a 2, on the rear of the chassis 1, so that said links 9 a and 9 b can

  freely rotate each in a vertical plane longitudinal

  nal, parallel to the vertical plane of symmetry of the skate

  (designated by III-III in Figure 4).

  During the pivoting of the links 9 a and 9 b in the vertical planes mentioned above, and corresponding movements of the pedal 6, the rear of the latter is guided by the vertical wings O and b of a chappe, the middle part is fixed to the rear of the beam constituting the chassis 1, while

  that the front of pedal 6 is guided by the vertical wings

  wedges, lla and 11 b of another clevis, the middle part of which is fixed to the front of the chassis 1 While the lateral edges of the pedal 6 slide with low friction in contact with the internal faces of the wings 10 a and b , the same edges are guided, at the front of the pedal 6, by rollers 12 a and 12 b, mounted idly on the edges of the pedal 6 and each rolling on a cam, 13 a or 13 b, which

  is fixed for example on the internal face of the wing

  respondante, lia or llb, and whose form and role will be described later in more detail We see

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  t c r I pas ", therefore of the average speed of advance, and, on the other hand,

  the possibility of very rapid braking in all

  tances. The present invention is not limited to the embodiment previously described; it includes d tn Agtaagacéri anq F 11 RR 131 PS wst Sat-i two feet normally form a V, having its point

  either facing forwards or backwards -

  The skate according to the present invention can be ______1 = 47 1 __ t_a_____ (at 14 a in FIG. 1) a lever, 15 a or 15 b, the lower arm of which is returned downwards by a spring such as 16 a, hooked to the chassis 1, while its other arm carries a loose roller, 17 a or 17 b, which, in the equilibrium position of the lever 15 a, under the action of the spring 16 a, protrudes above the upper edge of the cam 13a, as visible in FIGS. 2 and 3 When, on the other hand, the pedal 6 occupies the position illustrated in FIG. 1, and that the skater gives, with the tip of his foot, a downward push on the front of said pedal 6, each of the guide rollers, 12 a and 12 b, mounted idly at the front

  of said pedal 6 pushes down the corresponding roller

  dant, 17 a or 17 b, by turning the corresponding lever

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  visible in FIGS. 2 and 3, by a spring, 22 a, stretched between the pivoting part 20 a and a point on the chassis 1, by

  example close to the axis of the rear castors 5 a and 5 b.

  When, as will be described later, the rollers 12 a and 12 b, mounted idly at the front of the pedal 6, are erased relative to the rollers 17 a and 17 carried by the levers 15 a and 15 b, as visible on Figures 2 and 3, the springs such as 16 a bring the levers 15 a and 15 b

  and the rollers 17 a and 17 b in the rest positions visi-

  bles in Figures 2 and 3, while the springs such as 22a provide the release of the brake shoes

such as 19 a.

  The toothed wheel 23, fqui could be replaced by a toothed sector, of suitable angle, has its axis, 23 a, mounted freely rotating in a bearing (not shown),

  carried by the chassis 1 The toothed wheel 23, the diameter of which

  tre must be significantly lower than that of the casters

  medians, 2 a and 2 b, to prevent it from hitting

  ter roughness of the ground, meshes with a pinion 24, which is wedged on the axis 3 of the middle rollers 2 a, 2 b, with the interposition of a freewheel device, for example a ratchet wheel, cooperating with a pawl; as freewheeling devices of this kind are well known, it is not necessary to describe it in detail, and the scale of the various figures has moreover not made it possible to represent it. It suffices to specify that this device

  freewheel is arranged in such a way as to allow free

  Lely median rollers 2 a and 2 b at speeds greater than the instantaneous speed of rotation which communicates the pinion 24, meshing with the toothed wheel 23 A pusher 25 is fixed transversely in

  below the pedal 6, at a finger 26, fixed itself

  even transversely to the toothed wheel 23, or to the equivalent toothed sector On either side of the finger 26, the toothed wheel 23 further carries two lugs, 27 and 28, to which the first ends of two springs 29 and 30 are hung respectively , the second end of the spring 29

  is attached to a transverse axis-uniting the articulations-

  upper links 9 a and 9 b; the second extreme

  Mity of the spring 30 is fixed to the chassis 1, for example near the axis of the rear rollers, 5 a and 5 b The role of the two springs 29 and 30 will be explained later Finally, a spring, 31, is interposed between the chassis 1 and an appropriate point on the underside of the pedal 6, this point being located between the pusher 25 and the rollers

guide 12 a and 12 b.

  The user manual for the roller skate which has just been described is as follows: When the skater engages his foot 8 in the slipper 7, the weight of his body, if his other foot is raised above the ground, or only half the weight of

  his body if his other foot is placed on the ground, direct-

  ment or with the interposition of a roller skate, is supported, by means of the pedal 6, by the rods such as 9 a, that the spring 29 pulls in their extreme front position, defined by a stop, such as 32 a, fixed to the inner face of the wing l Oa of the rear chappe, as well as by the powerful spring 31, bearing on the chassis 1 The pedal 6, on which the skater's foot rests, then occupies its "waiting position ", practically horizontal, which differs from that visible in FIG. 1 only by the fact that the guide rollers 12 a and 12 b are raised above the rollers 17 a and 17 b of the brake control levers, 15 a

  and 15 b, so that the brakes 19 a and 19 b are released.

  In this position, the pusher 25 is in front and

  above the transverse finger 26 of the toothed wheel 23.

  Of course, in this standby position of the pedal 6, the skater can, at any time, brake the middle rollers 2 a and 2 b by giving, on the front of the pedal 6, a sharp stroke, which has to rotate the levers 15 a and 15 b and to bring the brake shoes 19 a

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  and 19 b in contact with the casters 2 a-and 2 b.

  To be propelled by the skate according to the present invention, which is provided for example with his right foot, the skater must then give a heel kick on the rear of the pedal 6, which was then in its waiting position This has the effect of pivoting the rods 9 a and 9 b towards their extreme rear position, defined by stops such as 33 a, which can be embodied for example by the ends of a rod whose middle part is fixed to the rear of chassis 1, and whose length is sufficient The energy developed by the heel kick of the skater is stored in the spring 29, which tightens, the Toothed Toe 23

  remaining in its rest position, visible on the fig-

  res 1 and 2 The pivoting of the rods 9 a and 9 b towards the rear drives in the same direction the pedal 6, the front rollers of which 12 a and 12 b are first guided by the respective upper edges of the cams 13 a and 13 b

  then escape these when said pedal 6 goes

  comes into its actuation position, which is shown in Figure 2, and in which the weight of the skater is

  still balanced at least in part by the spring 31.

  The skater then operates with his foot the

  pedal 6 so as to rotate it around the articulations

  higher, 9 al and 9 bl, connecting rods 9 a and 9 b.

  During this depression movement of the pedal 6, its front rollers, 12 a and 12 b are guided respectively by the rear edges, substantially vertical, of the cams 13 a

  and 13 b, which certainly avoids any internal actuation

  pestif of the control levers, 15 a and 15 b, of the braking devices There is on the other hand compression of the spring 31, and the lower end of the pusher 25, which, in the actuation position of FIG. 2, had been brought above the transverse finger 26 of the toothed wheel 23, exerts on the latter a downward thrust, which has the effect of rotating said toothed wheel 23 in the direction

2539312.

  arrow f (Figure 2); this results in a rotation, in the opposite direction, F of the middle rollers, 2 a and 2 b, on the axis 3 of which the pinion is wedged 24 This rotation of the middle rollers in the direction of the arrow F has the effect of advancing the whole skate and skater

  over a distance which obviously depends on the running distance

  the pedal 6 and the gear ratio

  motion transmission element 25-23-24 During the rotation of the toothed wheel 23, the attachment point 27 of the spring 29 also moves in the direction of the arrow f, and when said point 27 has reached above the axis 23 a, said spring 29 can relax; thus the energy which had previously been stored in the spring 29, when the skater had given a heel kick, then reinforces the driving action of the pedal 6 on

the middle rollers 2 a and 2 b.

  Figure 3 shows the pedal 6 in its fully depressed position, which can be defined for example by lower stops, not shown, and in which the pedal is again substantially horizontal, the entire pad having pivoted around the rollers

  drive 2 a, 2 b, so now it's the wheels

  front slats 4 a, 4 b which are in contact with the ground S As the pusher 25 ceases to exert a driving action on the toothed wheel 23 and, by means of the pinion 24, on the median rollers 2 a and 2 b, these will roll freely when, within a few seconds, the skate

  and the skater will continue to advance by inertia, that is

  say because of the kinetic energy that the previous propulsion gave them At any time during this free race, but preferably a little before it ends due to friction phenomena, the skater, leaning on the ground with his left foot, raise his right foot and the skate which equips him, so that

  the spring 30, as it relaxes, rotates the wheel

  tee 23 in the opposite direction to arrow f; as a result, the transverse finger 26 of the toothed wheel 23 pushes up the pusher 25 and the pedal 6 In fact as the pedal 6 is fixed to the skater's foot, it is the chassis I and the 2539312 t casters which it carries which descend By means of the spring 29, the same rotation of the toothed wheel 23 exerts a return force of the links 9 a and 9 b towards their extreme front position in FIG. 1; the front rollers, 12 a and 12 b, of the pedal 6 therefore return to the upper parts of the cams 13 a and 13 b, also thanks to the relaxation of the spring 31, so that said pedal 6 finds itself in its position of expectation and that, when the skater rests his right foot on the ground, he is able to brake, immediately, or at any later time,

  tapping the front of the pedal 6.

  In fact, as explained above, although it

  it is possible to use a single pad according to the pre-

  invention, the other foot of the skater being either

  equipped with an ordinary skate or without skate, it is pre-

  is fixed for example on the internal face of the wing

  respondante, lia or llb, and whose form and role will be described later in more detail We see

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  t t- ___________________________________ 2539312 i positions, o its longitudinal axis, designated by A in Figure 4, makes, with the longitudinal axis (III-III in Figure 4) an angle e, the value of which can be adjusted, preferably continuously, for example between 0 and + 30 degrees It is understood that this arrangement facilitates the use of roller skates according to the present invention by

  skaters whose feet are normally spread apart,

  that their heels are joined at an angle 2 e Of course, the angle e can receive a positive or negative value, to allow adaptation to skaters whose axes of the two feet normally form a V, having its tip

  facing either forward or backward.

  The skate according to the present invention can optionally be provided with a single drive wheel, for example 2 a, the other middle wheel, 2 b, being mounted.

  crazy It is also possible to delete the second wheel

  medial lette 2 b, and to arrange the chassis 1 so that the single drive wheel, 2 a, is located substantially

  in the plane of symmetry (III-III in Figure 4) of the skate.

  The total number of skate casters according to the present invention is optional, although it cannot be less than three. In the case where it is provided with two middle rollers, it may have only one roller at the center. 'front and / or rear In all these cases, the angle indicated in Figure 1 can have a zero value, so that all the skate wheels are always applied on the ground The skate according to this

  invention may also not include media casters

  nes, but only two castors at the front or rear, and at least one caster at the rear or front, one at

  less of these castors being driven.

  The roller skate according to the present invention-

  could, alternatively, be provided with per-

  putting to fix on the pedal 6, or on the midsole

  calaire 34, the entire 8 foot of the skater, including

his heel 8 a.

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  The means for guiding the pedal 6 between its different positions can be produced in various ways; in particular, the guidance of the rear part of the pedal 6 by the wings l Oa, l Ob of the rear cover is optional It is not the same for the guidance of the front part of the pedal 6 by the wings 11 E and 11 b of the front chappe; equivalent means could also be provided for laterally guiding the middle part of the pedal 6 In any case, these bilateral guides could be replaced by monolateral guides, possibly acting on opposite sides of the

  pedal 6 The guide rollers 12 a and 12 b are optional.

  tifs and the cams 13 a and 13 b may have different shapes, or be replaced by equivalent means,

  to prevent pedal 6 from activating the control levers

  mande, 15 a and 15 b, of the braking devices when it passes from its actuating position in FIG. 2, to its depressed position in FIG. 3 These braking devices themselves, and their control levers , 15 a and 15 b, are also susceptible to very

  various, including for example jaw brakes.

  type used on bicycles Of course, the number of skate casters according to the present invention on which the braking devices act is optional matter; theoretically, it suffices to be able to brake a single caster, regardless of its position relative to the elongated chassis 1; it is however preferable to brake at least two casters located simultaneously

on either side of the chassis 1.

  The pusher 25, fixed below the pedal 6, and the transverse finger 26, fixed to the toothed wheel 23, or to the equivalent toothed sector, can be replaced by a connecting rod, the two ends of which are articulated around horizontal axes. , one below the pedal 6, and the autregsur on one face of the toothed wheel or equivalent toothed sector, at a point close to that occupied by

2539312.

  finger 26 in Figures 1 to 3 Furthermore, the provision

  motion transmission device, which consists, in the embodiment illustrated in FIGS. 1 to 4, of the components 25, 26, 23 and -24 could be replaced by any other suitable motion transmission device, of a known type , this device being preferably arranged so that the driving stroke of the

  pedal 6 is transformed into a rotation of the driving wheels

  these, such as 2 a and 2 b, from as wide an angle as possible,

  so that a single actuation of the pedal 6 allows

  set to communicate to the skate and the skater the speed the

  as high as possible Whatever the embodiment

  tion chosen for this motion transmission device

  ment, it is always possible to have it attacked by the spring 29, so that, after being tensioned by the pivoting of the links 9 a and 9 b

  backward, the relaxation of said spring 29, during

  darkening of the pedal 6, reinforces the driving action of

the latter.

  The rear of the pedal 6 could be connected to the rear of the chassis 1, by a single link, similar to 9 a and 9 b, but arranged so as to pivot in the vertical plane of symmetry of the pad (designated by III-III on the

figure 4).

  The single compressed spring 31 could be replaced by several springs, in particular two similar lateral springs, compressed respectively between the edges of the pedal 6 and the ends of a fixed plate

transversely to the chassis 1.

  All the springs mentioned above, 16 a, 16 b, 22 a, 22 b, 29, 30, 31, or at least some of them, instead of being constituted by springs

  helical, could be formed by resistor blades

  comes out, or by elastically deformable organs,

  of which there are a large number of known embodiments.

  To each of these springs or organs elastically

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at

  deformable, or at least / some of them, for

  could possibly be associated with shock absorbers, of which

  there are also many known embodiments.

  The shape and construction of the chassis 1 are

  -5 optional materials Instead of having its rear part sup-

  carried by one or two links, such as 9 a and 9 b, the pedal 6 could be pivotally mounted relative to the chassis 1 around one or two separate transverse axes,

  by means of known mechanical organs.

  In addition to the spring 29, an additional spring could be stretched between an appropriate point on the chassis.

  1 and at least one of the links 9 a and 9 b, to contribute

  drink to bring pedal 6 from its rear position to its

waiting position.

  The finger 26 for controlling the toothed wheel 23 can

  To be advantageously replaced by a crazy pebble.

2539312,

Claims (11)

  1 roller skate, characterized in that it comprises a chassis (1) with rollers, on which a pedal   (6), adapted to support the foot (8), is pivotally mounted   aunt around at least one transverse axis (9 a 2), between a waiting position and an actuating position, reached each time the skater applies with his heel (8 a) a push on the back of the pedal (6) in the waiting position, a braking device (15 a, 17 a, 19 a, 22 a), which is mounted on the chftssis (1) so as to be actuated each time the skater applies , with   the tip of his foot, a push on the front of the   dale (6) in the standby position, a transmission device   movement movement (25, 26, 23, 24), which is mounted on the chtssis (1) so as to be actuated each time the skater applies, with his foot, a downward thrust,   on the pedal (6), moving it from its position   operation & a sinking position, and which is delivered   folded with at least one of the rollers (2 a, 2 b) so   & exert a driving action on it - each action -   ment of the pedal (6), as well as elastic means, such as springs (29, 30), for bringing the pedal back   (6), when the skater lifts his foot, from his position dark & its waiting position.   2 Skate & rollers according to claim 1, characterized in that a free wheel device is inserted between the movement transmission device (25, 26, 23, 24) and each drive wheel (2 a, 2 b) with which he is mated.   3 Skate & rollers according to any one of   Claims 1 and 2, characterized in that the pedal (6)   at its rear part connected to the chassis (1) by at least one link (9 a, 9 b), articulated at its two ends of   so as to pivot freely in a vertical plane, longitu-   dinal, between two positions, one front and the other rear which correspond respectively to the standby position of the pedal (6) and to its actuation position, and that at least two elastically deformable members, such as springs (29, 30) are provided, the first to bring back   the link (6 a, 6 b) from its rear position to its posi-   tion before, and the second, to return the pedal (6) from its depressed position to its actuating position or waiting.   4 Roller skate according to claim 3, characterized in that the first spring (29) attacks the movement transmission device (25, 26, 23, 24), so that, after being tensioned by the pivoting of the link (9 a, 9 b) from front to rear, the relaxation of said first spring (29), while the pedal is depressed (6), reinforces the driving action of the latter.   5 Roller skate according to any one of   claims 1 to 4, characterized in that the device   transmission transmission comprises at least one wheel (23) or a toothed sector, which is pivotally mounted on the chftssis (1) so as to mesh with a pinion (24), wedged on the axis (3) of the drive wheel (2 a, 2 b), as well as   means (25, 26) for transforming the movement of the   cementation of the pedal (6) in a rotation of said wheel (23) or of said toothed sector.   6 Roller skate according to claim 5, characterized in that the wheel (23) or the toothed sector is coupled with the pivoting pedal (6) by an articulated rod. 7 Roller skate according to claim 5,   characterized in that a pusher (25), fixed transversely-   ment below the pedal (6), is arranged to cooperate, when depressing said pedal (6), with a finger (26), fixed transversely to the wheel (23)   or to the toothed sector, and that an elastic member deforms   table, such as a spring (30), is arranged so as to return the wheel (23) or the toothed sector towards its position where said finger (26) is itself in the high position, below the pusher (25), raised by the pedal (6), then in actuation position.   8 Roller skate according to claims 4   and 5, characterized in that the first spring (29) is tensioned between a point (9 al) of the upper part of the articulated link (9 a, 9 b) and a point (27) of the wheel (23) or of the toothed sector, chosen so that the relaxation of said first spring (29) applies to the drive wheel (2 a, 2 b) a torque of m Ome sense as that resulting from depressing the pedal (6).   9 Roller skate according to any one of   Claims I to 8, characterized in that the device   brake comprises a control member, constituted for example by a lever (15a, 15b), which is pivotally mounted on the chassis (1), and that an elastically deformable member, such as a spring (16a, 16 b), normally maintains in its release position the brake (19 a, 19 b), - said lever (15 a, 15 b) being arranged so that the front of the pedal (6) makes it pivot towards its brake application position (19 a, 19 b) each time the skater applies a   pushed with the tip of his foot.   Roller skate according to any one of   Claims I to 9, characterized in that it comprises   means, comprising for example at least one roller (12 a, 12 b) and a cam (13 a, 13 b) integral with the chtssis (1), for guiding the pedal (6), and in particular its front part, in its movements between its different positions, and in particular to prevent it from acting, during its insertion,   the braking device (15 a, 18 a, 19 a).   11 Roller skate according to any one of   Claims I to 10, characterized in that a sole   (34) is interposed between the skater's foot (8) and the   dale (6), this sole (34) being mounted so as to be able to be locked on the pedal (6) in different positions, o its longitudinal axis (A) makes, with that of the pedal (6), angles ( 0) different, understood by example between O and + 30 degrees.   12 Skate & rollers according to any one   claims I & 11, characterized in that   means (7) are provided for removably fixing &   the pedal (6), or the midsole (54), only-   the front part of the skater's foot (8), his heel   (8 a) remaining free to lift.   13 Roller skate according to any one   claims 1 to 12, characterized in that the or   the drive rollers (2 a, 2 b), of relatively large diameter, are mounted in the middle part of the chassis (1), the front and rear parts of which each carry at least one idler wheel (4 a, 4 b or 5 a , 5 b), of equal or different diameter, and that the two planes below tangent to a drive wheel (2 a or Zb) and, respectively, to a front caster (4 a or 4 b) or to a rear caster (5 a or 5 b), preferably make an obtuse angle between them, the difference (a) with 180 degrees being worth only a few   degrees or a few tens of degrees.