Abstract:
Connection devices for connecting together a filter, a regulator, and a lubricator, which constitute a fluidic unit, are each provided with: a base member having a hole; a pair of first and second fastening members which are mounted to one side surface and the other side surface of the base members; and first and second holders held by the first and second fastening members. The first and second holders are engaged with the engagement protrusions of the filter, the regulator, and the lubricator, and first and second nuts are engaged with the first and second fastening members through threads to connect the fluidic devices together through the first and second holders. Caps are fitted over the first holders and the first nuts.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a connection device for fluid pressure devices (fluidic devices) which is capable of communicating fluid paths of a plurality of fluid pressure devices by connecting same types or different types of fluid pressure devices, such as a filter, a regulator, and a lubricator, in parallel. 
       BACKGROUND ART 
       [0002]    The present applicant has proposed a connection device which integrally connects fluid pressure devices such as a filter, a regulator, and a lubricator, which are used in a pneumatic circuit (see Japanese Patent No. 3851119). This connection device employs a structure in which a through hole is formed in a body having a hole part, an engaging member is engaged with a bolt which is inserted through the through hole, an engaging flange of the engaging member is engaged with each protrusion part provided in the vicinity of a port of two adjacent fluid pressure devices, and then the bolt is fastened so as to connect the fluid pressure devices with each other via the engaging flange. 
         [0003]    Further, the present applicant has proposed an invention related to the connection device: “connection structure for fluid pressure devices” in which the structure is further simplified and which is suitable for downsizing (see Japanese Patent No. 5565634). 
       SUMMARY OF INVENTION 
       [0004]    The present invention has been made in association with the above-mentioned propositions and an object of the present invention is to provide a connection device for fluid pressure devices which is capable of simply and quickly connecting fluid pressure devices such as a filter, a regulator, and a lubricator, and accordingly, capable of further improving assembling workability. 
         [0005]    In order to achieve the above-mentioned object, the present invention is characterized in that a connection device for fluid pressure devices, which is disposed between one and another of fluid pressure devices and integrally connects the fluid pressure devices to each other so as to allow respective fluid paths of the one and the other of the fluid pressure devices to communicate with each other, includes a base member which includes a hole part configured to allow one fluid path and another fluid path to communicate with each other, a pair of holders which are provided respectively on one lateral surface and another lateral surface of the base member, the one lateral surface and the other lateral surface being orthogonal to an axial direction of the hole part, and each of which is provided with a pair of holding parts, the holding parts being engaged with protrusion parts which are respectively provided on the one and the other of the fluid pressure devices, and a pair of fastening members which are provided on the one lateral surface and the other lateral surface of the base member and are configured to fix the holders respectively, wherein the fastening members include a main body part and a screw part, the main body part being formed to have a substantially rectangular sectional shape and being engaged with the base member, and the screw part protruding with respect to the main body part and being inserted into the holders, and wherein to at least one of the pair of holders, the screw part is inserted and a nut is screw-engaged, and a cap is fitted. 
         [0006]    According to the present invention, the holder and the nut are preliminarily covered by the cap to be integrated and these parts are fixed to the screw part of the fastening member. Accordingly, assembling work of these parts is facilitated, providing an advantageous effect for improving work efficiency in an assembling process. 
         [0007]    The above-mentioned object, characteristics, and advantages will be easily understood through description of an embodiment provided below in reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0008]      FIG. 1  is an external perspective view of a fluid pressure unit to which connection devices for fluid pressure devices according to an embodiment of the present invention are applied; 
           [0009]      FIG. 2  is a front elevational view of the fluid pressure unit illustrated in  FIG. 1 ; 
           [0010]      FIG. 3  is a whole sectional view of a filter constituting the fluid pressure unit of  FIG. 1 ; 
           [0011]      FIG. 4  is a whole sectional view of a lubricator constituting the fluid pressure unit of  FIG. 1 ; 
           [0012]      FIG. 5  is an external perspective view of the connection device illustrated in  FIG. 1 ; 
           [0013]      FIG. 6  is an exploded perspective view of the connection device of  FIG. 5 ; 
           [0014]      FIG. 7  is a plan view of main parts in a state that the filter and a regulator are connected by using the connection device illustrated in  FIG. 5 ; 
           [0015]      FIG. 8  is a longitudinal sectional view of main parts in an assembling state of a fastening member, a holder, a nut, and a cap which constitute the connection device illustrated in  FIG. 5 ; 
           [0016]      FIG. 9  is an exploded perspective view of a modification of the connection device illustrated in  FIG. 5 ; and 
           [0017]      FIG. 10  is a longitudinal sectional view of main parts of the modification of the connection device of  FIG. 9 . 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0018]    A connection device for fluid pressure devices according to the present invention will be described in detail below based on a preferable embodiment with reference to the accompanying drawings. 
         [0019]    In  FIG. 1 , the reference numeral  10  denotes a fluid pressure unit  10  to which connection devices  18   a ,  18   b  for fluid pressure devices according to the embodiment of the present invention are applied. Here, components of the connection devices  18   a  and components of the connection devices  18   b  are identical to each other, so that one connection device  18   a  will be described below. For the other connection device  18   b , identical reference characters will be given and detailed description of the connection device  18   b  will be omitted. 
         [0020]    As illustrated in  FIGS. 1 and 2 , this fluid pressure unit  10  includes a filter  12 , a regulator  14 , a lubricator  16 , and the pair of connection devices  18   a ,  18   b . The filter  12  removes dust and the like contained in pressurized fluid. The regulator  14  reduces pressure of the pressurized fluid. The lubricator  16  mixes lubricating oil with respect to the pressurized fluid. The connection device  18   a  is disposed between the filter  12  and the regulator  14 , and the connection device  18   b  is disposed between the regulator  14  and the lubricator  16 , thus connecting the filter  12 , the regulator  14 , and the lubricator  16  to each other. 
         [0021]    The above-mentioned filter  12 , regulator  14 , and lubricator  16  function as fluid pressure devices having a fluid path therein to which pressurized fluid is supplied, and are arranged so that the regulator  14  is disposed between the filter  12  and the lubricator  16 . 
         [0022]    The filter  12  includes a first body  20 , a case unit  22  which is connected to a lower part of the first body  20 , and a filter unit  24  which is housed in the inside of the case unit  22 , as illustrated in  FIGS. 1 to 3 . 
         [0023]    In the first body  20 , first and second ports  26 ,  28  to and from which pressurized fluid is supplied and discharged, are provided on respective lateral portions. The first port  26  is connected to a tube which is not shown and through which pressurized fluid is supplied. At the second port  28 , the pressurized fluid supplied to the first port  26  is discharged toward the regulator  14  which will be described later. 
         [0024]    Further, on lateral surfaces of the first body  20 , a pair of engaging protrusion parts  30   a  and a pair of engaging protrusion parts  30   b  are respectively provided. The engaging protrusion parts  30   a ,  30   b  are formed to face each other on outer edge parts of end surfaces on which the first and second ports  26 ,  28  are respectively provided. 
         [0025]    The case unit  22  includes an outer case  32  which is formed in a bottomed cylindrical shape, an inner case  34  which is inserted in the inside of the outer case  32 , a release button  36  which is provided to be freely displaceable with respect to the outer case  32 , and a drain cock  38  which is provided on bottom parts of the outer case  32  and the inner case  34 . 
         [0026]    When the case unit  22  is attached to an attachment hole  40  of the first body  20 , an upper end part of the release button  36  is inserted into a concave part (not shown) which is formed on the attachment hole  40  of the first body  20 . Accordingly, displacement of the case unit  22  in a rotating direction with respect to the first body  20  is regulated. 
         [0027]    As illustrated in  FIGS. 1 and 2 , the regulator  14  includes a second body  42 , a handle  44  which is rotatably provided on a lower part of the second body  42 , and a pressure adjustment mechanism (not shown) which is capable of adjusting pressure of pressurized fluid by operating the handle  44 . On lateral portions of the second body  42 , a pair of ports (not shown) to and from which pressurized fluid is supplied and discharged are respectively formed. One of the ports is connected to communicate with the second port  28  of the filter  12  and pressurized fluid is supplied from the filter  12 , while the other of the ports is connected to communicate with a third port  56  (which will be described later) of the lubricator  16  and the pressurized fluid is discharged. 
         [0028]    Further, on lateral surfaces of the second body  42 , a pair of engaging protrusion parts  46   a  and a pair of engaging protrusion parts  46   b  are respectively provided so that the engaging protrusion parts  46   a ,  46   b  face each other on outer edge parts of end surfaces on which a pair of ports are provided. 
         [0029]    Further, the regulator  14  is provided with the pressure adjustment mechanism thereinside. The regulator  14  drives the pressure adjustment mechanism by rotating the handle  44  to adjust pressure of pressurized fluid which is supplied from one port to a desired pressure, and then, discharges the pressurized fluid from the other port to supply the pressurized fluid to the lubricator  16 . 
         [0030]    The lubricator  16  is used for dripping lubricating oil into pressurized fluid so as to supply the lubricating oil to a sliding part and the like in another fluid pressure device by using a flow of the pressurized fluid. As illustrated in  FIGS. 1, 2, and 4 , the lubricator  16  includes a third body  48 , a case unit  50  which is connected to a lower part of the third body  48 , a dripping part  52  which is inserted into the inside of the third body  48 , and a holder  54  which fixes the dripping part  52  to the third body  48 . 
         [0031]    On the third body  48 , the third port  56  and a fourth port  58  to and from which pressurized fluid is supplied and discharged are respectively formed on lateral portions. The third port  56  and the fourth port  58  communicate with each other via a communication path which is not shown. Here, the third port  56  is connected to the other port of the regulator  14  provided adjacently, and the fourth port  58  is connected to a tube which is not shown. 
         [0032]    Further, on lateral surfaces of the third body  48 , a pair of engaging protrusion parts  60   a  and a pair of engaging protrusion parts  60   b  (see  FIG. 2 ) are respectively provided. The engaging protrusion parts  60   a ,  60   b  are formed to face each other on outer edge parts of end surfaces on which the third and fourth ports  56 ,  58  are respectively provided. 
         [0033]    The case unit  50  includes an outer case  62  which is formed in a bottomed cylindrical shape, an inner case  64  which is inserted in the inside of the outer case  62 , and a release button  66  which is provided to be displaceable with respect to the outer case  62 . In the inside of the inner case  64 , lubricating oil is filled through an oil supply plug  68  provided in the third body  48 . Further, the case unit  50  is attached to an attachment hole  69  of the third body  48 . 
         [0034]    As illustrated in  FIG. 4 , the dripping part  52  includes an inner member  70  which is inserted into the inside of the third body  48  and a dripping plug  72  which is provided on an upper part of the inner member  70 . In the inner member  70 , a storage chamber  74  to which lubricating oil is supplied from the inner case  64  is formed. This storage chamber  74  communicates with an oil path  76  which extends downward, and lubricating oil is supplied to the storage chamber  74  through this oil path  76 . On a substantially central part of the storage chamber  74 , a dripping port  78  is opened downward. The oil path  76  communicates with an oil supply port  82  which is formed on the holder  54 . 
         [0035]    The holder  54  is attached to the lower part of the inner member  70  constituting the dripping part  52 , and clamps and holds a part of a damper  80 . Further, the holder  54  includes the oil supply port  82  which communicates with the oil path  76 . This oil supply port  82  is disposed in the inside of the inner case  64  in a manner to protrude downward (the direction of the arrow B), and an oil guide tube  84  is connected to the oil supply port  82 . 
         [0036]    Further, lubricating oil filled in the inner case  64  flows toward the holder  54  through the oil guide tube  84 , then is supplied to the storage chamber  74  through the oil path  76 , and is dripped into a communication path from the storage chamber  74  through the dripping port  78 . Thus, a desired amount of lubricating oil is mixed in pressurized fluid which flows in the communication path. 
         [0037]    As illustrated in  FIGS. 1, 2, and 5 to 7 , the connection device  18   a  ( 18   b ) includes a base member (body)  86  which is formed in a substantially-square thin plate shape, a pair of first and second fastening members  88 ,  90  which are respectively provided on one lateral surface and the other lateral surface of the base member  86 , a pair of first and second holders  92 ,  94  which are held respectively by the first and second fastening members  88 ,  90  and hold the fluid pressure devices, and an attachment member  96  which is connected to the other lateral surface of the base member  86 . 
         [0038]    The base member  86  is formed to have a substantially constant thickness. A hole part  98  is formed on a substantially central part of the base member  86 , and a seal ring  100  made of an elastic material is attached to the hole part  98 . This seal ring  100  is provided such that an outer circumferential surface of the seal ring  100  is abutted on an inner circumferential surface of the hole part  98 . 
         [0039]    Further, on one lateral surface and the other lateral surface of the base member  86 , a pair of first and second concave parts  102 ,  104 , groove parts  106 , and communication holes  108  are formed. The pair of first and second concave parts  102 ,  104  are recessed toward the hole part  98 , and the first and second holders  92 ,  94 , which will be described later, are respectively attached to the pair of first and second concave parts  102 ,  104 . The groove parts  106  are provided closer to the hole part  98  than the first and second concave parts  102 ,  104 . The communication holes  108  allow communication between the groove part  106  and the first concave part  102 , and between the groove part  106  and the second concave part  104 . 
         [0040]    Each of the groove parts  106  is a space whose section has a rectangular shape and which has an opening. The groove parts  106  are formed in substantially parallel to the first and second concave parts  102 ,  104 , and the communication holes  108  are respectively formed substantially on the centers along the longitudinal direction of the groove parts  106 . 
         [0041]    Further, on an upper surface and a lower surface of the base member  86 , a pair of flange parts  110  which expand in the thickness direction of the base member  86  are respectively formed. In other words, the base member  86  is formed to have wide upper and lower surfaces. 
         [0042]    The first and second fastening members  88 ,  90  include a main body part  112  which is formed to have a substantially rectangular sectional shape and a screw part (shaft part)  114  which is provided on the center in the longitudinal direction of the main body part  112 . The first and second fastening members  88 ,  90  are formed so that the screw part  114  is orthogonal to the main body part  112 , and protrudes by a predetermined length. 
         [0043]    That is, the first and second fastening members  88 ,  90  are formed to have a substantially T-shaped sectional shape of the main body part  112  and the screw part  114 . In other words, the screw part  114  protrudes substantially from the center, which is relatively thick, of the main body part  112  in a manner to be orthogonal to the longitudinal direction of the main body part  112 , and for example the screw part  114  is a stud bolt having an outer circumferential surface on which a male screw is threaded. 
         [0044]    When the first fastening member  88  is assembled as the connection device  18   a ( b ), the main body part  112  is inserted into the groove part  106 , which is formed on one lateral surface of the base member  86 , and the screw part  114  of the first fastening member  88  is inserted into the communication hole  108 , such that an end of the screw part  114  protrudes into the first concave part  102 . In the same manner, the main body part  112  is inserted into the groove part  106 , which is formed on the other lateral surface of the base member  86 , and the screw part  114  of the second fastening member  90  is inserted into the communication hole  108 , such that an end of the screw part  114  protrudes into the second concave part  104 . 
         [0045]    Further, since the first and second fastening members  88 ,  90  are formed to have the substantially same thickness dimension as the thickness dimension of the base member  86 , the first and second fastening members  88 ,  90  do not protrude in the thickness direction of the base member  86  in a state that the first and second fastening members  88 ,  90  are attached. 
         [0046]    The first and second holders  92 ,  94  each include a flat part  116  which is formed on a substantially central part, and first and second holding parts  118 ,  120  which are formed respectively on both end parts of the flat part  116  and are inclined by a predetermined angle so that the first and second holding parts  118  and  120  mutually approach. On the first and second holders  92 ,  94  each, ribs  119 ,  121  which bend from the first holding part  118  through the second holding part  120  are formed in a protruded manner. The flat parts  116  are respectively inserted into the first and second concave parts  102 ,  104  of the base member  86 , and the first holding parts  118  and the second holding parts  120  are respectively arranged and abutted on the engaging protrusion parts  30   b  of the filter  12  and the engaging protrusion parts  46   a  of the regulator  14 . 
         [0047]    Bolt holes  122  to which the screw parts  114  of the first and second fastening members  88 ,  90  are loosely fitted respectively are formed substantially on the centers of respective flat parts  116 . The first holder (retainer)  92  is held with respect to the screw part  114  of the first fastening member  88  such that a first nut  126  is screw-engaged in a state that the screw part  114  of the first fastening member  88  is inserted through the bolt hole  122 . Meanwhile, the second holder  94  is held with respect to the screw part  114  of the second fastening member  90  such that a second nut  128  is screw-engaged in a state that the screw part  114  of the second fastening member  90  is inserted through. On an outer circumference of a head part  127 , which has a cylindrical shape, of the first nut  126 , a concave-convex part is formed along an axial direction. Meanwhile, on an inner circumferential surface of the first nut  126 , a screw hole  130  in which a wrench, which is not shown, is to be inserted is formed. Here, the reference numeral  132  denotes a flange part which is integrated with the head part  127 . 
         [0048]    In this case, in the present embodiment, a retainer cap (referred to below as a cap)  150  is fitted so that the cap  150  surrounds the first holder  92  and a part of the first nut  126 . As understood from  FIGS. 6 and 8 , the cap  150  includes a curved surface part  152  which is formed of a smooth surface, a first lateral wall part  154   a  and a second lateral wall part  154   b  which are respectively provided on both end parts of the curved surface part  152 , and a first plane part  156   a  and a second plane part  156   b  which are bridged between the curved surface part  152  and the first and second lateral wall parts  154   a ,  154   b . On the first plane part  156   a  and the second plane part  156   b , a cutout part  157  having a shape obtained by combining a rectangular shape and a trapezoid shape is formed, and one end part of the base member  86  is inserted into the cutout part  157  in assembly. The first and second lateral wall parts  154   a ,  154   b  are actually thick. Therefore, lightening holes  158   a ,  158   b  are formed respectively on the first lateral wall part  154   a  and the second lateral wall part  154   b  so as to reduce the weight of the first and second lateral wall parts  154   a ,  154   b.    
         [0049]    Further, in the cap  150 , a chamber  160  having a substantially rectangular shape is formed from the first plane part  156   a  through the second plane part  156   b , and the chamber  160  communicates with the outside thereof through a through hole  162  which is formed on the curved surface part  152  and has a circular shape. A diameter of the through hole  162  is larger than that of the head part  127  of the first nut  126 . Meanwhile, on inner surfaces, which are on the opposite side from the through hole  162 , of the first and second lateral wall parts  154   a ,  154   b , inclined surfaces  164   a ,  164   b  which are opened toward the outside in a manner to mutually spread are respectively provided. On end parts of the inclined surfaces  164   a ,  164   b , seat parts  166   a ,  166   b  which protrude inward are respectively provided. 
         [0050]    It is preferable that the cap  150  may be an integrally molded article which is integrally formed with a material slightly having an elastic force, and it is further preferable that the cap  150  may be made of metal or hard resin. 
         [0051]    The fluid pressure unit  10  to which the connection devices  18   a ,  18   b  according to the embodiment of the present invention are applied is basically structured as described above. Subsequently, assembly of the connection device  18   a  will be described. 
         [0052]    First, as the connection device  18   a  illustrated in  FIG. 6 , the seal ring  100  is inserted into the hole part  98  of the base member  86 , while the main body parts  112  of the first and second fastening members  88 ,  90  are respectively inserted into the groove parts  106  of the base member  86 , the screw parts  114  are respectively inserted into the communication holes  108  along the axial direction of the hole part  98 . Accordingly, such a state is produced that the screw parts  114  of the first and second fastening members  88 ,  90  protrude respectively into the first and second concave parts  102 ,  104  of the base member  86 . 
         [0053]    Meanwhile, the first nut  126  is housed in the inside of the chamber  160  of the cap  150 . At this time, through the housing operation, the first lateral wall part  154   a  and the second lateral wall part  154   b  mutually slightly spread by using elasticity of the cap  150 , and the ends of the first and second holding parts  118  and  120  of the first holder  92  are rendered to seat on the seat parts  166   a ,  166   b  of the cap  150 . In this housing, the head part  127  of the first nut  126  is exposed to the outside from the through hole  162  of the cap  150 . Accordingly, the cap  150  and the first holder  92  are integrated with each other. 
         [0054]    Subsequently, the flat parts  116  of the first and second holders  92 ,  94  are inserted respectively into the first and second concave parts  102 ,  104  while inserting the screw parts  114  of the first and second fastening members  88 ,  90  respectively through the bolt holes  122  of the first and second holders  92 ,  94 . Thereafter, the screw hole  130  of the first nut  126  is screw-engaged with respect to the screw part  114  of the first fastening member  88 . At this time, the head part  127  of the first nut  126  is exposed to the outside from the through hole  162  of the cap  150  as described above, so that screwing can be easily performed via the head part  127  of the first nut  126 . In this case, when the first nut  126  is screwed, the first fastening member  88  is pulled via the screw part  114  thereof. In other words, the cap  150  is rendered to engage with the flange part  132  of the first nut  126 , so that the cap  150  is displaced toward the base member  86  with the first holder  92  which is abutted on the inclined surfaces  164   a ,  164   b . As a result, the inner surface of the first holding part  118  and the inner surface of the second holding part  120  of the first holder  92  are rendered to be in pressure contact with the engaging protrusion part  30   b  of the first body  20  and the engaging protrusion part  46   a  of the second body  42 . This pressure contact effect spreads the first holding part  118  and the second holding part  120  of the first holder  92  with a resilient force to push the inclined surfaces  164   a ,  164   b  of the cap  150 , further strengthening integration of the cap  150  and the first holder  92 . The screw part  114  of the second fastening member  90  is inserted through a through hole  124  which is formed on a substantially central part of the attachment member  96 , and then, the second nut  128  is screw-engaged with the screw part  114 . Accordingly, the other lateral surface of the base member  86  is connected to the attachment member  96  and the first holder  92  is held (fixed) on one lateral surface side of the base member  86  at the same time. 
         [0055]    In this case, it is favorable to preliminary perform arrangement so that the engaging protrusion parts  30   b  on the second port  28  side of the filter  12  and the engaging protrusion parts  46   a  of the regulator  14  closer to the port connected to the second port  28  are made face each other, the base member  86  is held between the filter  12  and the regulator  14 , and the second port  28  and the port are substantially aligned with the hole part  98 . 
         [0056]    Meanwhile, after the first and second holding parts  118 ,  120  of the second holder  94  are engaged respectively with the engaging protrusion parts  30   b ,  46   a , the second nut  128  is screwed to be pulled toward the base member  86  along the screw part  114 . Accordingly, the second holder  94  moves toward the base member  86 . As a result, the first and second holding parts  118 ,  120  of the second holder  94  move in a mutually-approaching direction, and the engaging protrusion part  30   b  of the filter  12  and the engaging protrusion part  46   a  of the regulator  14  are strongly held to be mutually connected. 
         [0057]    At this time, the second port  28  of the filter  12  and one port of the regulator  14  mutually communicate via the hole part  98  of the base member  86 , and at the same time, the seal ring  100  prevents pressurized fluid which flows through the hole part  98  from leaking to the outside. 
         [0058]    Here, the assembling method in the case where the regulator  14  and the lubricator  16  are connected by the connection device  18   b  is substantially same as the above-described assembling method, so that the detailed description thereof will be omitted. Further, an assembling order of the filter  12 , the regulator  14 , and the lubricator  16  is not limited to the order of this description. 
         [0059]    As described above, in the present embodiment, the filter  12 , the regulator  14 , and the lubricator  16  which are fluid pressure devices can be connected to each other by using thrust along the axial direction of the screw parts  114  generated when the first and second holders  92 ,  94  are fastened by the first and second nuts  126 ,  128 . Therefore, the filter  12 , the regulator  14 , and the lubricator  16  can be strongly connected and a force can be equally applied with respect to adjacent fluid pressure devices via the first and second holders  92 ,  94 . Consequently, the fluid pressure devices can be connected to each other in a well-balanced manner. 
         [0060]    At this time, since the first nut  126  and the cap  150  are integrated in advance, the bolt hole  122  of the first holder  92  and the screw hole  130  of the first nut  126  can be easily matched or aligned in the axial direction, facilitating the assembling work. Further, the curved surface part  152 , the first lateral wall part  154   a , the second lateral wall part  154   b , and further, the smooth surfaces formed on the first plane part  156   a  and the second plane part  156   b  of the cap  150  surround a part of the first nut  126 , so that dust is hardly accumulated. 
         [0061]    In addition, in the fluid pressure unit  10  to which the connection devices  18   a ,  18   b  which are assembled as described above are applied, pressurized fluid is supplied from a pressurized fluid supply source, which is not shown, through a tube to the first port  26  of the filter  12 , then is introduced to the inside of the case unit  22  from the first port  26 , and passes through a filter element of the filter unit  24 . Accordingly, dust and the like contained in the pressurized fluid are favorably removed. Subsequently, the pressurized fluid ascends inside the filter unit  24  and is discharged as clean pressurized fluid from the second port  28 . 
         [0062]    Further, the pressurized fluid is supplied to one port (not shown) in the regulator  14  through the hole part  98  of the connection device  18   a , and is adjusted to have a preset pressure value by the handle  44 , and then the pressurized fluid subjected to the pressure adjustment is supplied through the other port to the lubricator  16  which is integrally connected by the connection device  18   b.    
         [0063]    This pressurized fluid subjected to the pressure adjustment is supplied from the third port  56  of the lubricator  16  to flow toward the fourth port  58 , and part of this pressurized fluid is supplied to the inside of the case unit  50  at the same time. Therefore, lubricating oil is pushed by the pressurized fluid supplied into the inner case  64 , flows toward the holder  54  (the direction of the arrow A) through the oil guide tube  84 , then is supplied to the storage chamber  74  through the oil path  76 , and is dripped with respect to the pressurized fluid through the dripping port  78 . Accordingly, after the lubricating oil is mixed in the pressurized fluid by a predetermined amount when the pressurized fluid passes through the inside of the inner member  70 , the pressurized fluid is supplied to another fluid pressure device, which requires lubricating oil, through a tube from the fourth port  58 . 
         [0064]    Here, needless to say, the connection device for fluid pressure devices according to the present invention is not limited to the above-described embodiment and may employ various types of structures without departing from the gist of the invention. For example, as a modification illustrated in  FIGS. 9 and 10 , the cap  150  is further slimmed by forming lightening parts  170 ,  172  on the outer sides of the first lateral wall part  154   a  and the second lateral wall part  154   b  without forming the lightening holes  158   a ,  158   b  on the cap  150 , thus being able to achieve further downsizing of the connection device.