Abstract:
A structure of inline skates is provided, the structure of inline skates includes a cushion device, a wheel with an annular ratchet wheel on its side, and a pawl assembly. By using the user&#39;s weight to press down the structure of present invention, the wheel with the annular ratchet wheel on its side engages the pawl assembly, which stops the wheel with the annular ratchet wheel on its side from rolling in one direction, and the wheel with the annular ratchet wheel on its side can roll in another direction. Thereby, the structure of inline skates is more ergonomic and exercise injuries can be prevented. In addition, a brake is provided for providing shock absorption and as a fulcrum to make more powerful acceleration. Besides, automatic support upright is also provided for avoiding tumbles.

Description:
REFERENCE TO RELATED APPLICATIONS 
     This Patent Application is being filed as a Continuation-in-Part application of Ser. No. 11/761,010, filed 11 Jun. 2007, currently pending. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates generally to inline skates, and particularly to inline skates that combining a one-way roll stop device and a cushion device for providing the inline skates with superior braking effect during sliding as well as with more forceful acceleration holds. Thereby, a structure of inline skates with ergonomics, exercise-injury prevention, and comfort is provided. 
     BACKGROUND OF THE INVENTION 
     Inline skating is a rising roller-skating exercise. To date a variety of types has developed including mainly recreational, figure, cross-country, acrobatic, and speed. Special structures are designed for cross-country and speed inline skates to meet their speed demands or requirements by special environments. In addition, user needs to receive extraordinary and long-term trainings to handle or use them appropriately. The basic structure and function thereof similar to recreational inline skates, details of the inline skates of these types are not described here. In the following, recreational, figure, and acrobatic inline skates are described in detail. 
     First, for a recreational inline skate, the structure thereof includes a boot, a base under the boot, and a plurality of wheels adapted on the base. There is no front brake pad. When the left leg slides, it is necessary to use the right leg for pressing the ground and pushing backwards in the direction slightly deviating from the direction of sliding, and then a forward force for the left leg is given. Owing to the larger wheel diameter with the longer span, it is laborious for both legs to alternatingly press down and push angularly to maintain a sliding motion over a long time period. In addition, it violates ergonomics as well. Besides, recreational inline skates do not provide effective braking arrangement. Some brands add rear brake pads behind the roller skates. While braking, the player has to put forth his strength to raise his feet upwards with his ankles pushed downwards so that the rear brake pads under the ankles can produce friction with the ground. By doing this, slight braking effect is attained. However, the braking effect is very poor, and the braking action violates ergonomics as well. Furthermore, the rear brake pads tend to make both legs stuck with and bump against each other and consequently make the player stumble when he alternates his legs to slide or when he corners (forward or backward crossovers). Thereby, most players disassemble the rear brake pads by themselves, which makes the rear brake pads exist in name only. 
     Moreover, for a figure inline skate, a front brake pad is adapted at the first-wheel position of a recreational inline skate, and all wheels are shrunk and arranged behind the front brake pad. Hence, the figure inline skate slides slower and unstable. When sliding forward, the center of gravity leans forward. Slight incaution results in touch of the front brake pad on the sliding leg on the ground, which is very dangerous because it will cause the player trip forward. 
     As for an acrobatic line skate, no brake is adapted thereon because a brake device that is like the one on a recreational or a figure inline skate obstructs absolutely acrobatic movements and thereby results in danger. However, it does not mean that an acrobatic inline skate need not a brake device. In fact, tumbles when wearing acrobatic inline skates occur frequently. Some severe injuries even happened. 
     To sum up, various current inline skates cannot provide an effective and safe brake device. A special braking skill, that is, T-stop, refers to turning aside and opening both legs abruptly during sliding to make both legs perpendicular to the direction of sliding for attaining braking effect. However, this skill needs long-term practices. Slight incaution tends to result in tumble and accidental injuries such as scrapes, collision injuries, and sprains. Besides, the skill violates ergonomics. In addition to ease of wear on the inline skates, T-stop is not applicable in all fields. If the field is slightly slippery, unsmooth, or has too much grip, falling over tends to happen. Thereby, improved brake device of inline skates is desired for solving inconveniences in operations and problems of frequent exercise injuries. 
     Owing to the drawbacks and imperfections of inline skates described above, the present invention provides inline skates complying with ergonomics, being exercise-injury preventive, shock absorptive, and comfortable. In addition, the inline skates according to the present invention provide multiple brakes as well as providing more powerful acceleration. By supporting upright automatically, the inline skates according to the present provide active safety for players. 
     SUMMARY 
     An objective of the present invention is to provide a structure of inline skates, which can achieves superior braking effect in a manner complying ergonomics. In addition, the inline skates according to the present invention can support upright automatically on the go for preventing tumbles. Thereby, exercise injuries are reduced or avoided accordingly, and active safety is provided. 
     Another objective of the present invention is to provide a structure of inline skates, which can provide effectively more forceful acceleration holds as well as shock-absorbing capability for comfort. Thereby, the operation quality of the inline skates is improved. 
     In order to achieve the objectives and effects described above, the present invention provides a structure of inline skates, which includes a base, a wheel set, at least one one-way roll stop device, and at least one cushion device. The base includes at least one connection member and an orientation member. Two side plates are disposed on the both sides of the connection member. A plurality of pivotal hole are disposed on the side plates. A long pivotal bore is disposed on the front end or the rear end of the least one side plate. The wheel set includes a front wheel and a rear wheel. The front wheel and the rear wheel are pivoted on the side plates. The front wheel and the rear wheel includes at least one bearing, respectively. The one-way roll stop device includes an annular ratchet wheel and a pawl assembly. The annular ratchet wheel is disposed on the side of the front wheel or the rear wheel of the wheel set. The annular ratchet wheel has a hole to form an annular shape. The diameter of the hole is greater than the diameter of the bearing, and the hole of the annular ratchet wheel is opposite to the bearing. 
     The pawl assembly is disposed on the base, the annular ratchet wheel is disposed opposite to the pawl assembly. The annular ratchet wheel and the pawl assembly are spaced from one another. The orientation member is utilized to orientate the pawl assembly for making the pawl assembly space from the annular ratchet wheel when the position of the base corresponding to the front wheel or the rear wheel is not pressed. The cushion device includes a sliding block and sleeve assembly and a spring. The sliding block and sleeve assembly includes a sleeve, which has a trough to be used for accommodating the spring. A pivotal hole is disposed at the lower end of the sleeve. The rear side of the sleeve has a sliding block corresponding to the long pivotal bore of the side plate with a shorter length. The sliding block is inset the long pivotal bore. 
     One end of the cushion device is disposed on the base, and the other end of the cushion device is connected with the front wheel or the rear wheel by passing a screw bolt assembly through the pivotal hole of the sliding block and sleeve assembly, the long pivotal bore of the side plate, and the front wheel or the rear wheel. The front wheel or the rear wheel can roll in two direction when the position of the base corresponding to the front wheel or the rear wheel is not pressed. When the position of the base corresponding to the front wheel or the rear wheel is pressed, the front wheel or the rear wheel of the wheel set is pressed accordingly. The cushion device eases the stress through compression thereof. When the cushion device compresses, it drives the annular ratchet wheel of the one-way roll stop device to contact with the pawl assembly to stop the front wheel or the rear wheel from rolling in one direction, and the front wheel or the rear wheel can roll in another direction. Thereby, braking effect and an acceleration hold are provided. In addition, shock-absorbing effect is provided as well by the cushion. 
     In order to make the structure and characteristics as well as the effectiveness of the present invention to be further understood and recognized, the detailed description of the present invention is provided as follows along with preferred embodiments and accompanying drawing figures. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a three-dimensional schematic diagram according to a first preferred embodiment of the present invention; 
         FIG. 2  shows an explosion view according to the first preferred embodiment of the present invention; 
         FIG. 3  shows a side view according to the first preferred embodiment of the present invention; 
         FIG. 4  shows an action schematic diagram of a front wheel according to the first preferred embodiment of the present invention; 
         FIG. 5  shows a resistive action schematic diagram of a front wheel according to the first preferred embodiment of the present invention; 
         FIG. 6  shows a schematic diagram according to a second preferred embodiment of the present invention; 
         FIG. 7  shows a schematic diagram according to a third preferred embodiment of the present invention; 
         FIG. 8  shows a schematic diagram of another preferred embodiment of the cushion device according to the present invention; 
         FIG. 9  shows a schematic diagram according to a fourth preferred embodiment of the present invention; 
         FIG. 10  shows a schematic diagram according to a fifth preferred embodiment of the present invention; 
         FIG. 11  shows a schematic diagram of stopping a front wheel according to a fifth preferred embodiment of the present invention; 
         FIG. 12  shows a schematic diagram of the orientation member according to the present invention; 
         FIG. 13  shows a schematic diagram of the orientation member disposed on the pawl assembly and the side plate according to the present invention; 
         FIG. 14  shows a schematic diagram according to a sixth preferred embodiment of the present invention; 
         FIG. 15  shows a schematic diagram according to a seventh preferred embodiment of the present invention; 
         FIG. 16  shows a schematic diagram according to a eighth preferred embodiment of the present invention; 
         FIG. 17  shows a schematic diagram according to a ninth preferred embodiment of the present invention; 
         FIG. 18A  shows a schematic diagram of conventional pawl stopping the ratchet wheel according to prior art; and 
         FIG. 18B  shows a schematic diagram of conventional pawl separated from the ratchet wheel according to prior art. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1 to 3  show a structure of inline skates according to a first preferred embodiment of the present invention. The inline skate  100  includes a boot  10 , a base  20 , a wheel set  30 , an one-way roll stop device  40 , and a cushion device  50 . 
     The boot  10  is disposed on the base  20 , and the base  20  comprises at least one connection member. The connection member is a connection plates  21  according to this embodiment. Two side plates  22  is disposed under both sides of the connection plate  21 , respectively. At the front end of the side plates  22 , a long pivotal bore  221  is disposed. Behind and above the long pivotal bore  221 , two orientation holes  222  are disposed on the side plates  22 . In addition, behind the long pivotal bore  221 , three pivotal holes (not shown in the Figures) are disposed for mounting the wheel set  30 . The wheel set  30  includes a front wheel  31 , two intermediate wheels  32 , and a rear wheel  33 . The front wheel  31  includes a hole  311  and a plurality of fixed holes  315 , and at least one bearing  36  is set in the hole  311 . The front wheel  31  is adapted between the two long pivotal bores  221  by means of a screw bolt assembly  34 . The intermediate wheels  32  and the rear wheel  33  are adapted between pivotal holes of the side plates  22  behind the long pivotal bores  221  by means of screw bolt assemblies  35 , respectively. In the present invention, It can also be that the wheel set  30  includes only one intermediate wheel  32 , or the wheel set  30  only includes the front wheel  31  and the rear wheel  33  without any intermediate wheel  32  disposed therein. 
     The one-way roll stop device  40  includes an annular ratchet wheel  41  and a pawl assembly  42 . The annular ratchet wheel  41  and the pawl assembly  42  serve as a roll member and an one-way brake member respectively. The annular ratchet wheel  41  has a hole  413  and is an annular-shaped slice and is smaller slightly in diameter than the front wheel  31 . It is manufactured integrally and is mounted pivotally at the center on the side of the front wheel  31 . Alternatively, the annular-shaped slice can be fixedly coupled to the center on the side of the front wheel  31 . As shown in  FIG. 2 , the annular ratchet wheel  41  has a plurality of fixed holes  415 . The annular ratchet wheel  41  is fixed on the side of front wheel  31  by passing a plurality of fixing members  37  through the fixed holes  415  and  315 . First ratchet teeth  411  with one-way hook-shaped teeth are disposed on the periphery of the annular ratchet wheel  41 . The diameter of the hole  413  of the annular ratchet wheel  41  is greater than the diameter of the bearing  36 , and the hole  413  is opposite to the bearing  36 . It is not necessary to remove the annular ratchet wheel  41  when the bearing  36  is needed to change. It will be convenient to change the bearing  36 . Otherwise, the weight of the annular ratchet wheel  41  is reduced while the annular ratchet wheel  41  has the hole  413 . 
     The pawl assembly  42  includes an elastic plate  421  and pawls  422  disposed on both sides under the elastic plate  421 . The elastic plate  421  is roughly a U-shaped plate. The shape here according to a preferred embodiment is used for description but not for limiting its scope. On both ends of the elastic plate  421 , two wing plates  423 , which extend upwards and outwards, are adapted. At least one second ratchet teeth  425  is disposed on the pawl  422 , which has two long bores  424 . The pawl assembly  42  is orientated on the orientation holes  222  by passing at least one orientation member  426  through the long bores  424  and the orientation holes  222 , the ratchet wheel  41  and the pawl assembly  42  are spaced from one another (shown in  FIG. 3 ), and the orientation member  426  here according to one embodiment is a screw bolt assembly. 
     The wing plates  423  of the elastic plate  421  connect against the underside of the connection plate  21  while making the second ratchet teeth  425  of the pawls  422  correspond to the first ratchet teeth  411  of the annular ratchet wheel  41 . Thereby, the pawl assembly  42  can move up and down due to the orientation member  426  can move up and down in the long bores  424 . Moreover, because the elastic plate  421  has elasticity and can extend and compress, the pawl assembly  42  can have elastic cushion effect accordingly, which occurs when the ratchet wheel  41  is not locked but can slide freely. Furthermore, the pawl assembly  42  has the two pawls  422  without requiring the elastic plate  421  and the wing plates  423  disposed thereon. The pawls  422  are disposed on the side plates  22  of the base  20  by passing the orientation member  426  through the long bores  424  of the pawls  422  and the orientation holes  222 . 
     The cushion devices  50  are disposed on one side of the side plates  22 , respectively, including two sliding block and sleeve assemblies  51 , two springs  52 , two adjustment shafts  53 , and at least one nut  54 . The sliding block and sleeve assembly  51  is an assembly with a sleeve  511  and a sliding block  512 , and the sliding block  512  is disposed on the rear side of the sleeve  511 . The sliding block  512  is a long block corresponding to the long pivotal bore  221  with a shorter length. A pivotal hole  514  is adapted at the lower end of the sliding block and sleeve assembly  51 . The sliding block and sleeve assembly  51  is disposed on the side of the front wheel  31  by passing the screw bolt assembly  34  through the pivotal hole  514 , the long pivotal bore  221  and the front wheel  31 . The sliding block  512  insets the long pivotal bore  221 . 
     A trough  513  is disposed on the top of the sleeve  511  (as shown in  FIG. 3 ), and is used for accommodating the spring  52 . The spring  52  is put around the adjustment shaft  53 , whose top end is fixedly coupled to the side plate  22  of the base  20 . The top end of the adjustment shaft  53  also can be fixedly coupled to the connection plate  21  of the base  20 . In addition, threads are adapted on the adjustment shaft  53  with nuts  54  thereupon for confining the spring  52  between the trough  513  and the nut  54 . By adjusting the threading locations of the nuts  54 , the compression force of the spring  52  can be adjusted accordingly. Hence, requirements by players with different weights or by various cushioning conditions can be met by adjustments at any time. 
     Please refer to  FIG. 3 . The first ratchet teeth  411  on the annular ratchet wheel  41  of the one-way roll stop device  40  protrude opposite to the second ratchet teeth  425  on the pawl  422  of the pawl assembly  42 , and the first ratchet teeth  411  on the annular ratchet wheel  41  and the second ratchet teeth  425  on the pawl  422  are spaced from one another. Besides, when the annular ratchet wheel  41  contacts with the pawl assembly  42 , according to the rolling direction of the annular ratchet wheel  41 , two statuses result including an occlusion and cease-rolling status, and a free-sliding and maintain-rolling status. When the one-way roll stop device  40  is disposed on the front wheel  31 , it is installed to make the annular ratchet wheel  41  and the pawl assembly  42  in the free-sliding and maintain-rolling status when the annular ratchet wheel  41  rolls forwards, and in the occlusion and cease-rolling status when the annular ratchet wheel  41  rolls backwards. Thereby, when the one-way roll stop device  40  is disposed on the front wheel  31 , it can stop the front wheel  31  from rolling if the front wheel  31  rolls backwards. 
     Please refer to  FIG. 4 . In general, when the inline skates slide forward, the weight of the player is distributed evenly on the front wheel  31 , the two intermediate wheels  32 , and the rear wheel  33 . In this scenario, the front wheel  31  maintains common operation condition. The pawl assembly  42  is orientated on the base  20  by the means of the orientation member  426 , and therefore the annular ratchet wheel  41  and the pawl assembly  42  are spaced from one another. Thus, the annular ratchet wheel  41  and the pawl assembly  42  are not contacted each other and does not affect the roll of the front wheel  31 . Therefore, the front wheel  31  can roll forwards or backwards. Even if the player pushes downwards the front wheel  31 , the front wheel  31  will not stop rolling forward. This is because when the inline skates move forwards, the front wheel  31 , and hence the annular ratchet wheel  41 , roll forwards as well. Thereby, the annular ratchet wheel  41  and the pawl assembly  42  are not occlusive. Through the elastic cushioning function of the pawl assembly  42 , the annular ratchet wheel  41  and the pawl assembly  42  will be in the free-sliding and maintain-rolling status. 
     Please refer to  FIG. 5 . The braking function of the one-way roll stop device  40  disposed on the front wheel  31  is similar to the ratchet wheel in front of a general figure skate or to the brake pad in front of a conventional four-wheel skate, and is done by tipping toes while sliding backwards. If acceleration is desired, the back propelling leg uses the front wheel  31  to propel backwards. At the instant of propelling, the front wheel  31  rolls backwards. Thereby, when the player needs braking or acceleration, the front wheel  31  is pressed downwards. At this moment, the front wheel  31  rolls backwards. Because of downward pressure on the cushion device  50  by weight, the annular ratchet wheels  41  on sides of the front wheel  31  engage with the pawl assemblies  42  and rolling is stopped. Hence, the rolling of the front wheel  31  is stopped in one direction. Thereby, braking effect or a hold for forward acceleration is provided. Consequently, when the front wheel  31  rolls forwards, if pressure is exerted downwards, the annular ratchet wheel  41  and the pawl assembly  42  are in the free-sliding and maintain-rolling status. On the other hand, when the front wheel  31  rolls backwards, if pressure is exerted downwards, the annular ratchet wheel  41  and the pawl assembly  42  are in the occlusion and cease-rolling status. It is to say, when the front wheel  31  is pressed downward, the annular ratchet wheel  41  and the pawl assembly  42  are engaged to stop the front wheel  31  from rolling in one direction, but the front wheel  31  can be rolled in another direction. 
       FIG. 6  shows a schematic diagram of a structure of inline skates according to a second preferred embodiment of the present invention, and is used for describing that an one-way roll stop device  40 ′ and a cushion device  50 ′ are disposed on the rear wheel  33 . The difference between the present embodiment and the previous embodiment is that the one-way roll stop device  40 ′ is disposed as stopping rolling while rolling forwards. That is, the directions of the first ratchet teeth  411 ′ of an annular ratchet wheel  41 ′ and the second ratchet teeth  425 ′ of a pawl assembly  42 ′ are opposite to the directions of those disposed on the front wheel  31 . Thereby, when a player needs braking or is about to fall down faceup carelessly, by pressing the rear wheel  33  downwards by his weight to some extent, the annular ratchet wheel  41 ′ on the side of the rear wheel  33  contacts the pawl assembly  42 ′, and thus ceasing the rear wheel  33  from rolling forwards in one direction. Accordingly, a braking force is attained for braking and a forward supporting reaction force is provided for avoiding falling down backwards. 
     In addition, the baking effect according to the present embodiment is far superior to the braking effect of the rear brake pad in a recreational inline skate according to the prior art without the drawbacks and danger brought about by the latter. Moreover, as same as above description of the first preferred embodiment, the annular ratchet wheel  41 ′ and the pawl assembly  42 ′ are spaced from one another and the annular ratchet wheel  41 ′ does not contact with the pawl assembly  42 ′ when the player does not press the rear wheel  33 . In this scenario, the roll of the rear wheel  33  is not affected and the rear wheel  33  can roll forwards or backwards. Otherwise, a long pivotal bore is disposed on the rear end of the side plate  22  according to this embodiment for disposing the cushion device  50 ′. The side plate  22  has an orientation hole according to this embodiment. The pawl assembly  42 ′ is orientated by passing the orientation member  426 ′ through the orientation hole. At least one bearing is disposed on the rear wheel  33  according to this embodiment. 
       FIG. 7  shows a schematic diagram of a structure of inline skates according to a third preferred embodiment of the present invention. The third preferred embodiment is provided on the basis of the first preferred embodiment described above. The annular ratchet wheel  41  and the pawl assembly  42  are disposed likewise. The difference is the cushion device  60  of this embodiment. The side plates  22  of the base  20  are further divided into connection side plates  23  on both sides. The back end of the connection side plate  23  connects with the side plate  22 , and the front end thereof is used for pivoting the front wheel  31 . In addition, the cushion device  60  includes a sleeve assembly  61 , a spring  62 , an adjustment shaft  63  and at least one nut  64 . The sleeve assembly  61  includes a sleeve  611 , and a pivotal hole  614  is disposed under the sleeve  611 . The pivotal hole  614  is provided for fixing the sleeve assembly  61  on the side of the front wheel  31  and the side of the connection side plate  23  by means of the screw bolt assembly  34 . 
     A penetrating trough  615  is disposed in the sleeve  611  of the cushion device  60  and is used for accommodating the spring  62 . Inside the penetrating trough  615 , a ring-stop surface  616 , which is used for stopping the spring  62 . The spring  62  is putted around the adjustment shaft  63 , and the top end of the adjustment shaft  63  is fixed on the side plate  22  of the base  20 . Otherwise, the top end of the adjustment shaft  63  is fixed on the connection plate  21  of the base  20 . Threads are adapted on the adjustment shaft  63  with the nut  64  thereupon for confining the spring  62  between the trough  615  and the nut  64 . When the adjustment shaft  53  is passed through the penetrating trough  615 , a nut  617  or a C type ring is used for securing under the lower end of the adjustment shaft  53 . Thereby, the position of the front wheel  31  can be orientated by means of the connection side plate  23 , the sleeve  611 , and the adjustment shaft  53 . Besides, the compression force of the spring  62  can be adjusted by adjusting the nuts  54 . Furthermore, the connection side plate  23  also can be connected with the rear wheel  33 , and the cushion device  60  is disposed on the rear wheel  33 . 
       FIG. 8  shows a schematic diagram of another preferred embodiment of the cushion device according to the present invention. The cushion device  65  includes a sliding block and sleeve assembly  66 , a spring  67 , and an upper sleeve  68 . The sliding block and sleeve assembly  66  includes a sleeve  661 , a sliding block  662  and a pivotal hole  664 . The sliding block  662  is disposed on the rear side of the sleeve  661 , and is corresponding to the long pivotal bore  221  of the base  20  with a shorter length (as shown in  FIG. 2 ). The pivotal hole  664  is disposed at the lower end of the sleeve  661 . The screw blot assembly  34  passes through the pivotal hole  664 , the long pivotal bore  221  and the front wheel  31 , and the sliding block  662  is inset the long pivotal bore  221  to fixing the sliding block and sleeve assembly  66  and the front wheel  31  on the base  20 . 
     A trough  663  is disposed at the top end of the sleeve  661  and is used for accommodating the spring  67 . The upper sleeve  68  is disposed on the side plate  22  or the connection plate  21  of the base  20  by means of a fixed member (not shown in the Figures). The upper sleeve  68  includes an upper trough  683 , which is corresponding to the sleeve  661  of the sliding block and sleeve assembly  66 . The spring  67  is confined between the trough  663  and the upper trough  683 . Otherwise, by adding spacers to the trough  663  and/or the upper trough  683 , the compression force of the spring  67  can be adjusted accordingly. Hence, requirements by players with different weights or by various cushioning conditions can be met by adjustments at any time. The cushion device  65  according to this embodiment also can be disposed on the rear wheel  33 , and the rear end of the base  20  also includes a long pivotal bore for insetting the sliding block  662  of the sliding block and sleeve assembly  66 . 
       FIG. 9  shows a schematic diagram of a structure of inline skates according to a fourth preferred embodiment of the present invention. The cushion device  70  of this preferred embodiment is different from the cushion device  65  of the  FIG. 8 . The cushion device  70  includes a sleeve assembly  71 , a spring  72  and an upper sleeve  73 . The sleeve assembly  71  includes a sleeve  711  and a pivotal hole  714 . The pivotal hole  714  is disposed at the lower end of the sleeve  711 . The sleeve assembly  71  is fixed on the side of the front wheel  31  and the side of the connection side plate  23  by passing the screw bolt assembly through the pivotal hole  714 . A trough  713  is disposed on the sleeve  711  and is used for accommodating the spring  72 . The upper sleeve  73  is disposed on the side plate  22  or the connection plate  21  of the base  20  by means of a fixed member  38 . The upper sleeve  73  includes an upper trough  733 . The spring  72  is confined between the trough  713  and the upper trough  733 . Otherwise, the side plate  22  further includes an arc trench  223 , and the connection side plate  23  further includes a pillar  233 . The pillar  233  is inset the arc trench  223 , and the pillar  233  is movable in the arc inset  223 . 
       FIG. 10  shows a schematic diagram of a structure of inline skates according to a fifth preferred embodiment of the present invention. The pawl assembly  75  of this preferred embodiment is different from the pawl assembly  42  of the previous embodiment. The pawl assembly  75  is disposed between the inside of the side plate  22  of the base  20  and the front wheel  31 . One end of the pawl assembly  75  is disposed on the side plate  22  of the base  20 , and another end of the pawl assembly  75  includes at least one second ratchet tooth  751 . A long bore  76  is disposed on the pawl assembly  75 . An orientation member  77  is disposed on the base  20  by passing through the long bore  76 . The pawl assembly  75  is orientated by the orientation member  77 , and therefore the pawl assembly  75  and the annular ratchet wheel  41  are spaced from one another. The orientation member  77  is movable in the long bore  76 . The pawl assembly  75  and the annular ratchet wheel  41  are not contacted each other when the position of the base  20  corresponding to the front wheel  31  is not pressed. Thereby, the front wheel  31  can roll forward or backward. 
     As shown in the  FIG. 11 , when the position of the base  20  corresponding to the front wheel  31  is pressed, the front wheel  31  will move up to make the pawl assembly  42  engage the annular ratchet wheel  41  thereby stopping, the front wheel  31  from rolling in one direction, and rolling in another direction. In this embodiment, the front wheel  31  can rolls forwards, nor rolls backwards. The pawl assembly  75  and the annular ratchet wheel  41  also can be applied to the rear wheel  33  according to this embodiment. When the position of the base  20  corresponding to the rear wheel  33  is pressed, the pawl assembly  75  and the annular ratchet wheel  41  are engaged thereby stopping the rear wheel  33  from roll in one direction, and rolling in another direction. The directions of the annular ratchet wheel  41  and of the pawl assembly  75  disposed on the rear wheel  33  are opposite to the directions of those disposed on the front wheel  31 . Thereby, the rear wheel  33  could roll forwards or backwards when player does not press the rear wheel  33 , and when the player press the rear wheel  33 , the annular ratchet wheel  41  and the pawl assembly  75  are engaged, so as to stop the rear wheel  33  from rolling forwards, but rolling backwards. 
     According to a preferably embodiment of the present invention, the inner diameter of the annular ratchet wheel  41  is 16-30 mm, and the outer diameter of the annular ratchet wheel  41  is 30-46 mm. The annular ratchet wheel  41  has 12-32 first ratchet teeth  411 , and the pawl assembly  75  has 1-6 second ratchet teeth  751 . According to a preferably embodiment, the engagement perimeter of the first ratchet teeth  411  of the annular ratchet wheel  41  and the second ratchet teeth  751  of the pawl assembly  75  is not over than three sixteenth of the peripheral of the annular ratchet wheel  41 . 
       FIG. 12  shows a schematic diagram of the orientation member  77  of the  FIGS. 10 and 11 . The orientation member  77  includes a flange  771 , a orientation shaft  773  and a fixing shaft  775 . The flange  771  is disposed on the upper end of the orientation shaft  773 , and the fixing shaft  775  extends from the lower end of the orientation shaft  773 . The diameter of the flange  771  is greater than the diameter of the orientation shaft  773 , and the diameter of the orientation shaft  773  is greater than the diameter of the fixing shaft  775 . As shown in  FIG. 13 , when the orientation member  77  is disposed on the side plate  22  of the base  20  by passing through the long hole  76  of the pawl assembly  75 , the fixing shaft  775  is fixedly coupled to the side plate  22  of the base  20 , and the flange  771  and the side plate  22  of the base  20  would stop the pawl assembly  75 . Thereby, the pawl assembly  75  would be orientated on the orientation shaft  773  to be opposite to the annular ratchet wheel  41  accurately. 
     Otherwise, the pawl assembly  75  would not be shake or wobble to contact the front wheel  31  or the rear wheel  33  for preventing the rolling of the front wheel  31  or the rear wheel  33  from the influence of the pawl assembly  75 . Hence, when the base  20  is pressed, it would be ensure that the annular ratchet wheel  41  and the pawl assembly  75  are engaged. the orientation member  77  is a rivet according to a preferably embodiment. 
       FIG. 14  shows a schematic diagram of a structure of inline skates according to a sixth preferred embodiment of the present invention. The pawl assembly  80  of this preferred embodiment does not include long hole  76  of the  FIG. 10 . The orientation member  87  is used for stopping the pawl assembly  80 , and therefore the pawl assembly  80  and the annular ratchet wheel  41  are spaced from one another. Thereby, when the position of the base  20  corresponding to the front wheel  31  is not pressed, the pawl assembly  80  and the annular ratchet wheel  41  are not contacted with each other, therefore the front wheel  31  can roll forwards or backwards. When the position of the base  20  corresponding to the front wheel  31  is pressed, the front wheel  31  is moved up to make the pawl assembly  80  engage the annular ratchet wheel  41 , thereby the front wheel  31  is stopped from rolling in one direction, and rolling in another direction. 
     According to above embodiment and description, the pawl assembly and the annular ratchet wheel are spaced from one another. Therefore, the front wheel or the rear wheel can roll forwards or backwards. However, when the position of the base corresponding to the front wheel or the rear wheel is pressed, the front wheel or the rear wheel will be moved up so as to make the pawl assembly engage the annular ratchet wheel. Thereby, the front wheel or the rear wheel is stopped from rolling in one direction, and being able to roll in another direction. The structure of the pawl assembly and he annular ratchet wheel of the present invention is different from the conventional structure of the pawl and the ratchet wheel, which is used for rolling in one direction only. 
     As shown in  FIG. 18A , in conventional concept, a ratchet wheel  90  and a pawl  95  are kept in contact with each other generally. The ratchet wheel  90  has an axle hole  93  for pivoting a shaft  94  to be disposed on a wheel  92 . One end of the pawl  95  is disposed on a shaft  96 , and a spring (not shown in Figures) is disposed on the shaft  96 , and the pawl  95  is always contacted with the ratchet wheel  90  since the elastic force of the spring affects to the pawl  95 . Thereby, the ratchet wheel  90  and the pawl  95  would be contacted with each other to limit the wheel  92  to rolling in one direction, nor rolling forwards or backwards. If the conventional ratchet wheel  90  is spaced from the pawl  95 , the pawl  95  is rotated by the elastic force of the spring. Therefore, the pawl  95  contacts against the base plate  96 , as shown in  FIG. 18B . Therefore, the pawl  95  can be not used for engaging the ratchet wheel  90  again. 
     Although the pawl assembly is separated from the annular ratchet wheel according to the present invention, but these would not occur above problem of the ratchet wheel  90  and the pawl  95 . The present invention is to use the orientation member orientating the pawl assembly for making the pawl assembly and the annular ratchet wheel be spaced from one another and disposed on the most appropriate position to be in engagement. When the position of the base corresponding to the front wheel or the rear wheel is not pressed, the front wheel or the rear wheel is moved up to make the pawl assembly engage the annular ratchet wheel. Thereby, the front wheel or the rear wheel is stopped from rolling in one direction, but the front wheel or the rear wheel can be rolled in another direction. 
     Accordingly, the design concept of the pawl assembly and the annular ratchet wheel according to present invention is different from the design concept of the conventional pawl and the conventional ratchet wheel. Otherwise, the conventional ratchet wheel has a axis hole for pivoting on the shaft, so that the wheel with the conventional ratchet wheel cannot be convenient for changing the bearing of the wheel. However, the present invention has a hole whose diameter is greater than the diameter of the bearing, nor axis hole. Thereby, it is convenient to change the bearing of the wheel and is effect to reduce the weight of the annular ratchet wheel. 
       FIG. 15  shows a schematic diagram of a structure of inline skates according to a seventh preferred embodiment of the present invention. A base  25  of this preferred embodiment is different from the base  20  of  FIG. 2 . The base  25  includes at least one connection block  26  and two side plates  22 , preferably the base  20  has two connection blocks  26  according to this preferred embodiment. The connection block  26  serves as a connection member to connect the two side plates  22 . A plurality of fixing member (no shown in Figures) are passed through the two side plates  22  and the two connection blocks  26  to dispose the two side plates  22  on the both sides of the two connection blocks  26 . A orientation trench  261  is disposed on at least one side of the connection block  26  corresponding to the front wheel  31 , preferably two orientation trenches  261  are disposed on both sides of the connection block  26 . The two orientation trenches  261  serve as two orientation members to orientate the two pawl assemblies  89  for making the two pawl assemblies  89  and the two annular ratchet wheels  41  are spaced from one another, and the two pawl assemblies  89  are corresponding to the two annular ratchet wheels  41 , respectively. 
     One end of the pawl assembly  89  is disposed on the orientation trench  261  by the fixing member (not shown in Figures). The pawl assembly  89  is inset the orientation trench  261 , and the orientation trench  261  is larger than the pawl assembly  89 . The pawl assembly  89  is orientated on the orientation trench  261  since the side wall of the orientation trench  261  and the side plate  22  stop the pawl assembly  89 . As shown in  FIG. 16 , the pawl assembly  89  is opposite to the annular ratchet wheel  41  accurately, and the pawl assembly  89  would be wobbled to contact with the front wheel  31  for preventing the rolling of the front wheel  31  from the influence. Hence, when the base  25  is pressed, it is ensure that the pawl assembly  89  engages the annular ratchet wheel  41 . 
       FIG. 17  shows a schematic diagram of an improved structure of inline skates according to a ninth preferred embodiment of the present invention. The ninth preferred embodiment is provided on the basis of the above preferred embodiment described above. The ninth preferred embodiment adopts different device for embodying at least one one-way roll stop device  40 A. The adjustment shaft  63  of the cushion device  60  is disposed on a pivotal hole  24  in front side of the side plate  22 . The cushion device  60  is connected with the front wheel  31  and the connection side plate  23  by means of a screw bolt assembly  34 . However, a different device is adopted for embodying said at least one one-way roll stop device  40 A. First, a plurality of surrounding arc-shaped holes  230  is disposed on the connection side plate  23 , and a pivotal hole  231  is disposed on the center of said plurality of surrounding arc-shaped holes  230 . 
     Besides, the one-way roll stop device  40 A includes a side ratchet wheel  401  and a side pawl  402 , and the side ratchet wheel  401  and the side pawl  402  are defined as a roll member and a brake member respectively. The side ratchet wheel  401  is disposed inside the front wheel  31 . At least one bearing  26  is disposed on the front wheel  31 , and the side ratchet wheel  401  includes a hole whose diameter is greater than the diameter of the bearing  26 . The side pawl  402  has an annular body  402 A, one side of the annular body  402 A has at least one ratchet tooth  402 B. The ratchet tooth  402 B correspond to the side ratchet wheel  401 , and can engage with each other or slide freely, and the annular body  402 A has a plurality of the ratchet teeth  402 B according to the embodiment. When the front wheel  31  rolls forwards, the ratchet teeth  402 B slides freely with the side ratchet wheel  401 . On the contrary, when the front wheel  31  rolls backwards, the ratchet teeth  402 B engages with the side ratchet wheel  401 . On the other side of the annular body  402 A, a plurality of first stick-like parts  402 D and a plurality of second stick-like parts  402 E are both distributed annularly. The first stick-like parts  402 D are thicker than the second stick-like parts  402 E, and a trench  402 C is disposed on the end of each second stick-like part  402 E. The plurality of surrounding arc-shaped holes  230  is larger than the plurality of first stick-like parts  402 D and second stick-like parts disposed on one side of the annular body  402 A of the side pawl  402 . In addition, each second stick-like part  402 E of the side pawl  402  is passed through the plurality of surrounding arc-shaped holes  230  disposed on the connection side plate  23 , as same as above description of the first preferred embodiment, the side ratchet wheel  401  and the side pawl  402  are spaced from one another. 
     A second compression spring  407 , a spacer  406 , a first compression spring  405 , a special-shaped spacer  404 , and a hook ring  403  are slip on sequentially thereon. The hook ring  403  clips on a trench  402 C. The inner radius of the spacer  406  is smaller than the outer radius of the circle surrounded by the first stick-like parts  402 D, and the elastic force of the second compression spring  407  is smaller than that of the first compression spring  405 . Thereby, a driving apparatus is defined to include a driver  408 , the second compression spring  407 , the spacer  406 , the first compression spring  405 , the special-shaped spacer  404 , and the hook ring  403 . Owing to the functions of the first compression spring  405  and the second compression spring  407 , the annular body  402 A of the side pawl  402  maintains tight contact with the connection side plate  23  under normal conditions. Therefore, the side ratchet wheel  401  and the side pawl  402  are spaced from one another. 
     In addition, the driver  408  is disposed on the side plate  22  and is disposed the upper side of the special-shaped spacer  404 . When weight presses the connection plate  21 , the cushion device  60  is compressed accordingly, which makes the driver  408  close and contact the special-shaped spacer  404 . Because the contact surface between the driver  408  and the special-shaped spacer  404  is an inclined plane  408 A, when the driver  408  is pressed down, it will produce a pressing force on the special-shaped spacer  404  towards the connection side plate  23 . Nevertheless, because the inner radius of the spacer  406  is smaller than the outer radius of the circle surrounded by the first stick-like parts  402 D, and the elastic force of the second compression spring  407  is smaller than that of the first compression spring  405 , said pressing force towards the connection side plate  23  will not compress the first compression spring  405 , but, instead, will force the spacer  406  to compress the second compression spring  407  and thereby make the side pawl  402  move towards the side ratchet wheel  401 . At this moment, if the front wheel  31  rolls backwards, the side ratchet wheel  401  will engage the side pawl  402  and the rolling of the front wheel  31  is stopped in one direction. However, the front wheel  31  can roll in another direction. On the contrary, if the front wheel  31  rolls forwards at the moment, due to deployment of the first compression spring  405 , the side ratchet wheel  401  and the side pawl  402  slide freely. In addition, the driver  408  does not contact the special-shaped spacer  404  and the side ratchet wheel  401  and the side pawl  402  are spaced from one another when the player does not press the front wheel  31 . Therefore, the side ratchet wheel  401  does not contact the side pawl  402  and the roll of the front wheel  31  is not affected, and therefore the front wheel  31  can roll forwards or backwards. From the description above, it is known that the present has at least the following effects and features:
     1. If the cushion device and the one-way roll stop device according to the present invention are disposed on the front wheel, when the front wheel is pressed to some extent while rolling backwards, the front wheel has the capability of stopping rolling backwards and in one direction. If the cushion device and the one-way roll stop device according to the present invention are disposed on the rear wheel, when the rear wheel is pressed to some extent while rolling forwards, the rear wheel has the capability of stopping rolling forwards and in on direction. 2. According to the present invention, if forward propelling is desired by pressing backwards, because the propelling leg is pressed downwards by weight and the front wheel is pushed backwards, which is in a back-rolling status, thereby, back-rolling is stopped in one direction. Consequently, a hold for propelling forward that is more powerful and more ergonomic is given. 3. The operation of the braking function on the front wheel according to the present invention is similar to the ratchet wheel in front of a general figure skate or to the brake pad in front of a conventional four-wheel skate, and is done by tipping toes while sliding backwards. At this moment, the front wheel is pressed while rolling backwards, thereby, a braking function that is more ergonomic and safe is given. The braking effect of the rear wheel is similar to the braking effect of the rear brake pad in a recreational inline skate. When the player slides forwards, if he puts forth his strength to raise his feet upwards with his weight pushed downwards the rear wheel, at which moment the rear wheel is pressed to some extent and rolling forward, a braking effect that stops rolling forwards is attained. The baking effect is far superior to the braking effect of the rear brake pad in a recreational inline skate according to the prior art without the drawbacks and danger brought about by the latter.   4. As provided in the front and the rear wheels according to the present invention, when the player steps forward, because of the cushion devices disposed thereon, tiptoes and ankles are cushioned and shock-absorbed. Thereby, ergonomic effect is attained.   5. When the players is about to fall down forwards carelessly, because the front wheel is pressed by weight while rolling backwards, a braking force is given for stopping rolling backwards and in one direction. Thereby, the player is supported upright automatically. When the players is about to fall down faceup carelessly, because the rear wheel is pressed by weight while rolling forwards, a braking force is given for stopping rolling forwards. Thereby, the player is supported by the reaction force upright automatically. Hence, the present invention can provide a function of automatically support upright before falling down faceup carelessly or falling down forwards carelessly.   

     Accordingly, the present invention conforms to the legal requirements owing to its novelty, non-obviousness, and utility. However, the foregoing description is only a preferred embodiment of the present invention, not used to limit the scope and range of the present invention. Those equivalent changes or modifications made according to the shape, structure, feature, or spirit described in the claims of the present invention are included in the appended claims of the present invention.