Abstract:
It is an-object to provide an MR system and a floor cover capable of being attached and detached by one operator. In the invention, the floor cover covers a front face of a lower part of an open type MR system, and a cradle on which an object is mounted swiftly moves thereon. The floor cover is provided with a slide capable of moving on the lower part.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    The present invention relates to a floor cover, which covers a front face of a lower part of an open type MR (Magnetic Resonance) system and in which a cradle where an object is provided moves swiftly thereon, and an MR system.  
           [0002]    Explanation is given with reference to FIG. 6 which is a perspective view of an open type MR system.  
           [0003]    An open type MR system includes, in general, a lower part  1 , an upper part  3 , and two supporters  5  and  7  for supporting the upper part  3  by way of a space A on the lower part  1 .  
           [0004]    Inside the lower part  1  and the upper part  3 , there are provided a magnet for causing an even static magnetic field in the space A and a receiving coil for receiving an MR signal from an object P.  
           [0005]    The object P is placed in a cradle  13  provided in a table  11 , and the object P is carried in and carried out of the space A of the MR system by the cradle  13  moving back and forth in the direction of an arrow I.  
           [0006]    Here, the cradle  13  moves back and forth in the direction of the arrow I by sliding on the front face of the lower part  1 .  
           [0007]    Further, in order for the object to step on and off the cradle  13 , a table  11  is capable of rising and falling in the direction of an arrow Further, in order to make possible to carry the object P in the space A from an arbitrary direction to the MR system, the table  11  is capable of moving in the direction of an arrow III along the MR system.  
           [0008]    The front face (floor) of the lower part  1  is a cover (a floor cover  21  is used hereinafter) which is capable of being attached and detached through the whole area of the floor in order to make it possible to check easily a magnet and a receiving coil of the inside. The cradle  13  moves swiftly on the floor cover  21 .  
           [0009]    Further, in the front edge portion of the floor cover  21 , a touch sensor  31  to detect the collision of the cradle  13  and the like is provided.  
           [0010]    In this touch sensor  31 , a sensor body  33  is provided as shown in FIG. 7 as a sectional view taken along the cutting line A-A of FIG. 6, which includes a long bar type base  35  provided in an angle part of a front edge part of the floor cover  21  and a sensor cover  37  made of rubber covering the base  35  which is fixed to the floor cover  21  with a double-faced tape.  
           [0011]    Since the floor cover  21  of the MR system structured in the aforementioned way has a wide area, it is not possible for one operator to attach and detach but two operators are required.  
           [0012]    Here, as shown in FIG. 8, it is also possible to provide a floor cover  23  having the size in which it comes to be possible for one operator to attach and detach;  
           [0013]    However, in such a case that this kind of floor cover  23  is provided, a channel G is made between the floor cover  23  and a peripheral floor, and thus an insanitary condition is caused since dust and the like go into this channel G.  
           [0014]    Further, at the time that the cradle  13  passes above this channel G, another problem in which discomfort is caused.  
         SUMMARY OF THE INVENTION  
         [0015]    Therefore the object the present invention is to provide the MR system and the floor cover capable of being attached and detached by one operator.  
           [0016]    The invention according to the first aspect to solve the aforementioned problem is characterized in that a floor cover which is provided in an attaching and detaching way on a front face, on which a cradle moves swiftly, of a lower part of an open type MR system, includes a slide capable of moving on the lower part.  
           [0017]    By providing the slide capable of moving on the lower part, it is possible to attach and detach the floor cover without help.  
           [0018]    The invention according to the second aspect is the floor cover according to the first aspect, which is characterized in that the slide is fixed to a back face.  
           [0019]    By fixing the slide to the back face, it is omitted to take a time for fixing and removing the slide, and thus the operability is improved.  
           [0020]    The invention according to the third aspect is the floor cover according to the first or second aspect, which is characterized in that the slide is capable of being stored in the lower part.  
           [0021]    Since the slide is capable of being stored in the lower part, it is possible to prevent the system from becoming large in size. The invention according to the fourth aspect is the floor cover according to any one of the first to third aspects, which is characterized in that a table is capable of being attached to and detached from a front part of an MR system in which the table is provided.  
           [0022]    By attaching to and detaching from a front part of the MR system in which the table having a space is provided, the operability is improved.  
           [0023]    The invention according to the fifth aspect is the floor cover according to the fourth aspect, which is characterized in that the slide is provided in an end portion side of the MR system.  
           [0024]    By providing the slide in the end portion side of the MR system, it is possible to attach and detach the floor cover in a stable condition at the time of attaching to and detaching from the front portion of the MR system.  
           [0025]    The invention according to the sixth aspect is the floor cover of the MR system according to any one of the first to fourth aspects, which is characterized in that a plurality of the slides are provided.  
           [0026]    By providing a plurality of the slides, a three-point supporting condition is attained in any event among a human being and plural slides, and thus it is possible to attach and detach in a stable condition.  
           [0027]    The invention according to the seventh aspect is the floor cover according to any one of the first to sixth aspects, which is characterized in that the slide moves on a resin plate covering an-upper portion of an internal instrument of the upper part.  
           [0028]    Since the slide moves on the resin plate covering the upper part of the internal instruments in the upper part, it is possible to move smoothly.  
           [0029]    The invention according to the eighth aspect is the floor cover according to anyone of the first to seventh aspects; which is characterized in that the slide includes a base provided in the back face of the floor cover and a slider provided in a rotatable way to the base, engaged with a space formed in the lower part at a time of storing, and capable of moving on the resin plate by rotating at a time of using.  
           [0030]    Since the structure includes only the base and the slider, the cost becomes low.  
           [0031]    Further, the slider engages with the space formed in the lower part at the time of storing, it cannot be supposed that the size of the MR system becomes large.  
           [0032]    As the slider, it is possible to use an element, which slides on the resin plate in the same way as the invention according to the ninth aspect, or an element, which rolls and moves on the resin plate, such as a roller and a ball in the same way as the invention according to the twelfth aspect.  
           [0033]    The invention according to the tenth aspect is the floor cover according to the ninth aspect, which is characterized in that the slider is made of low friction resin.  
           [0034]    Since the slider is made of low friction resin, sliding resistance comes to be small and thus it is possible to move smoothly.  
           [0035]    The invention according to the claim  11  is the floor cover according to the ninth or tenth aspect, which is characterized in that an angle between a top end face of the slider and the resin plate and an angle between an endmost face of the slider and the resin plate are obtuse respectively.  
           [0036]    Since an angle between a top end face of the slider and the resin plate and an angle between an endmost face of the slider and the resin plate are obtuse respectively, it is possible to move smoothly even if there are a few concaves and projections on the resin plate.  
           [0037]    Here, as the slider provided in a rotatable way to the base, an element, which rotates on the surface perpendicular to the floor face, may be possible in the same way as the invention according to the thirteenth aspect or an element, which rotates on the surface parallel to the floor face, may be possible in the same way as the invention according to the fourteenth aspect.  
           [0038]    The invention according to the fifteenth aspect is the floor cover according to any one of the eighth to fourteenth aspects, which is characterized in that a stopper for prohibiting rotating of the slider at a time of using is provided.  
           [0039]    Since the stopper for prohibiting rotating of the slider at the time of using is provided, it is possible to prevent any impossibility to move because the stopper spins while moving, and thus it is possible to move the floor cover smoothly.  
           [0040]    The invention according to the sixteenth aspect is the MR system characterized in that the floor cover according to any one of the first to fifteenth aspects is included.  
           [0041]    By including the floor cover according to any one of the first to fifteenth aspects, it is possible to attach and detach without help.  
           [0042]    The following embodiment is also a preferable embodiment. (1) A structure which includes: a sensor body; a long bar type base provided in the front end part of the floor cover; and a sensor cover for covering the base; and forms: as a touch sensor provided in the front end portion of the floor cover, a projecting portion which forms a hooking space by cooperating with the floor cover in the side portion in the longitudinal direction of the base; and a claw part capable of engaging with the hooking space along the longitudinal direction in the sensor cover.  
           [0043]    By structuring in this way, there is no variation per hour, when the case in which the sensor cover is fixed by the double-faced tape and the like is compared.  
           [0044]    Further, since it is enough only to engage the claw part of the sensor cover with the hooking space, the operability comes to be good and further unevenness due to the degree of the skill of the user comes to be less.  
           [0045]    Further, it is possible to produce using an extrusion molding method by forming the base and the sensor cover in the same sectional shape throughout the whole length, thereby to reduce cost.  
           [0046]    According to the present invention, it is possible to provide the MR system and the floor cover capable of attaching and detaching without help.  
           [0047]    Further objects and advantages of the present invention will be apparent from the following description of the preferred embodiments of the invention as illustrated in the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0048]    [0048]FIG. 1 is a view showing a use condition of a slide of the embodiment, in which  
         [0049]    [0049]FIG. 1( a ) is a view seen from the B direction of FIG. 2, and FIG  1 ( b ) is a top view of FIG. 1( a ).  
         [0050]    [0050]FIG. 2 is a view showing the whole structure of an open type MR system of the embodiment and a condition in which a floor cover is taken off.  
         [0051]    [0051]FIG. 3 illustrates a storing condition of FIG. 1.  
         [0052]    [0052]FIG. 4 is a sectional view of a touch sensor of FIG. 1.  
         [0053]    [0053]FIG. 5 is a view for explaining another embodiment.  
         [0054]    [0054]FIG. 6 is a perspective view of an open type MR system.  
         [0055]    [0055]FIG. 7 is a sectional view taken along the cutting line A-A of FIG. 6.  
         [0056]    [0056]FIG. 8 is a view for explaining problems. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0057]    In the following, the example of the embodiment of the present invention is with reference to drawings.  
         [0058]    First of all, with reference to FIG. 2 which illustrates a condition in which a floor cover is removed, a whole structure of an open type MR system for the case of the present embodiment is explained.  
         [0059]    A visual shape of the open type MR system, in the same way as the conventional embodiment, includes in general a lower part  101 , an upper part  103 , two supporters  105  and  107  which support the upper part  103  through a space A on the lower part  101 .  
         [0060]    Inside the lower part  101  and the upper part  103 , there are provided a magnet which forms even static magnetic fields in the space A, a receiving coil for receiving an MR signal from an object, and so forth.  
         [0061]    Further, a resin plate  201 , which covers the magnet and the coil, is provided in the lower part  101 .  
         [0062]    On the other-hand, a slide  301  capable of sliding and moving on the resin-plate  201  is provided on the back face of a floor cover  121  for covering the upper surface of the lower part  101 .  
         [0063]    Further, a touch sensor  131  for detecting a conflict of a cradle and the like is provided in a front edge portion of the floor cover  121 .  
         [0064]    In the case of the present embodiment, since there is a space in the front portion in which a table not shown in the drawing is provided, two slides  301  are provided in the depth portion of the floor cover  121 .  
         [0065]    Next, the slide  301  is explained with reference to FIG. 1 which illustrates the condition of using the slide  301 . At this point, FIG. 1( a ) is a view observed from the B direction of FIG. 2, and FIG. 1( b ) is a top view of FIG. 1( a ).  
         [0066]    A base  303  extending downward is fixed to the reverse side of the floor cover  121 . A slider  307  made of resin having low frictional properties is fixed to the bottommost portion of the base  303  in a rotatable way by way of a hinge  305 .  
         [0067]    A top end face  201   a  and a back end face  201   b  of the slider  307  have tapered faces in which angles to the resin plate  201  are obtuse, even if there are a few concaves and projections on the resin plate  201 , so as to override them.  
         [0068]    At this point, since FIG. 1 indicates a use condition, it is possible for the slider  307  to slide on the resin plate  201 .  
         [0069]    On the base  303 , a stopper  309  which touches with the slider  307  and prohibit the slider  307  from turning towards the direction of the arrow C is provided.  
         [0070]    Further, for the turn of the slider  307  in the opposite-direction of the arrow C, since the hinge  305  is in the condition of closing, it is in the prohibited condition to turn furthermore in the opposite direction of the arrow C.  
         [0071]    On the base  303 , a guide  311 , in which a space in which the stopper  309  is inserted and passed by working together with the base  303  is formed, is provided. The stopper  309  is inserted and passed through the space formed by this guide  311  and the base  303 , and thus it comes to be possible for the stopper  309  to move only in the upward and downward directions.  
         [0072]    Furthermore, a projection  309   a  for prohibiting pullout is formed in the lower portion of the stopper  309 , and a screw  313  for prohibiting being pulled out is formed in the upper portion of the stopper  309 .  
         [0073]    Next, the storing condition of the slide  301  is explained with reference to FIG. 3.  
         [0074]    By moving the stopper  309  in the upward and downward directions, the slider  307  is turned and then engaged with a space D formed in the lower part  101 .  
         [0075]    Next, the touch sensor  131  is explained with reference to FIG. 4. FIG. 4 is a sectional view of the touch sensor  131  in FIG. 1.  
         [0076]    The touch sensor  131  includes a sensor body  133 , a long bar type elastic base- 135  which provides this sensor body  133  and is formed in a front edge portion of the floor cover  121 , and an elastic sensor cover  137  which covers the base  135 .  
         [0077]    A projecting portion  135   a  for forming a hooking space E by cooperating with the floor cover  121  is formed in the side of the base  135  in the longitudinal direction.  
         [0078]    On the other hand, a claw part  137   a  capable of engaging with the hooking space E is provided in the sensor cover  137  in the longitudinal direction.  
         [0079]    According to the structure, the following advantageous points can be obtained.  
         [0080]    (1) It is possible to attach and detach the floor cover  121  without help, since the slide  301 , which is capable of moving on the resin plate  201  on the lower part  101 , is provided in the floor cover  121 .  
         [0081]    (2) Since two slides  301  are provided, a three-point support is made by a human being and two slides  301 , and thus it is possible to attach and detach in a stable condition.  
         [0082]    (3) The slide  301  includes the base  303 , the slider  307 , and the stopper  309 , thus cost therefor can be reduced.  
         [0083]    (4) Since the slider  307  engages with a space D formed in the lower part  101  at the time of storing, the size of an MR system will not become large.  
         [0084]    (5) Since the stopper  309  for prohibiting turning of the slider  307  at the time of using is provided, it is possible to prevent the stopper  309  from rotating at the time of moving and then from not being removable, and thus it comes to be possible to obtain that the floor cover  121  moves smoothly.  
         [0085]    (6) For the touch sensor  131 , it is enough to engage the claw part  137   a  of the sensor cover  137  with a hooking space, and thus it is achieved to obtain the good efficiency of working and to cause less unevenness due to the degree of worker&#39;s skill.  
         [0086]    Further, since the base  135  and the sensor cover  137  have the same sectional shape, it is possible, by employing resin or rubber having elastic characteristics as material, to produce by an extrusion molding method, and thus the price comes to be low.  
         [0087]    At this point, the present invention is not limited to the aforementioned embodiment.  
         [0088]    As the slider, it is also possible to use not only a sliding type on the resin plate  201  but also a rolling type using a roller, a ball, and the like.  
         [0089]    Further, in the embodiment, though it has been explained to engage with the space D formed in the lower portion at the time of storing, it is also possible to store in the upward direction as shown in FIG. 5( a ) or in the horizontal direction as shown in FIG. 5( b ).  
         [0090]    Many widely different embodiments of the invention maybe configured without departing from the spirit and the scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.