Abstract:
Provided is a cable holding tool capable of reducing a size of a gap formed at a portion where soft members are sandwiching a cable to thereby increase air-tightness thereat. First sealing members ( 26   a,    26   b ) having fluffs are attached to a first opposing surface of a soft member ( 25 ). Second sealing members ( 29   a,    29   b ) having fluffs are attached to second opposing surfaces of soft members ( 28   a,    28   b ). When a cable ( 17 ) is sandwiched between the first sealing members ( 26   a,    26   b ) and the second sealing members ( 29   a,    29   b ), the fluffs of the first sealing members ( 26   a,    26   b ) and the fluffs of the second sealing members ( 29   a,    29   b ) are in contact with each other.

Description:
RELATED APPLICATIONS 
     This application is a national phase application under 35 U.S.C. §371 of International Patent Application No. PCT/JP2015/063283, filed on May 8, 2015, which claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2014-101392, filed on May 15, 2014, the contents of which are hereby expressly incorporated by reference in their entirety for all purposes. 
     TECHNICAL FIELD 
     The present invention relates to a cable holding tool for holding a cable which passes through a wiring opening. 
     BACKGROUND ART 
     A working machine includes, for example, a workshop for machining workpieces using tools such as drills and milling cutters, and a control room for controlling processing machinery in the workshop. Control devices such as a driver and a computer are housed in the control room. The processing machinery and the control devices are connected by cables. A wiring opening is opened in a housing of the control room to allow the passage of the cables. A cable holding tool that functions to hold the cables and also functions to block outside air is attached to the housing of the control room. The working machine is arranged inside a factory. Air inside the factory contains dust, oil, coolant fluids, or the like. When the air containing these matters enters the control room, they cause malfunctioning of the control devices. Therefore, the cable holding tool prevents the penetration of the air containing the above matters into the control room through the wiring opening. 
     A conventional cable holding tool shown in  FIG. 10  and  FIG. 11  is known (see patent document 1: Japanese Unexamined Utility Model Application Publication No. S61-179784).  FIG. 10  is a plan view of the conventional cable holding tool, and  FIG. 11  is a perspective view thereof. In  FIG. 10 , reference numeral  1  represents a housing of the conventional cable holding tool, reference numeral  2  represents a cable passing through the housing  1 , reference numerals  3   a  and  3   b  represent soft members such as sponges, and reference numerals  4   a  and  4   b  represent pressing tools for pressing the soft members  3   a  and  3   b . As shown in  FIG. 11 , the cable  2  can be held and the wiring opening of the housing  1  can be sealed by sandwiching the cable  2  between the elastically deformable soft members  3   a ,  3   b.    
     However, with the conventional cable holding tool, small gap(s)  5  (see  FIG. 10 ) are formed at a position where the soft members  3   a ,  3   b  are coming together to sandwich the cable  2 . As a result of this formation a problem may arise in that inside of the housing  1  communicates with outside air via the gap(s)  5 . To solve this problem, it has been proposed to provide a plurality of slits on surfaces of the soft members  3   a ,  3   b  that contact the cable  2  to thereby improve elasticity of the soft members  3   a ,  3   b  such that the formation of the gap(s) is prevented, but this solution made no changes in the formation of the small gap(s). 
     Therefore, an object of the present invention is to provide a cable holding tool capable of reducing a size of the gap(s) formed at a position where soft members are sandwiching the cable to thereby increase air-tightness thereat. 
     SUMMARY OF THE INVENTION 
     In order to solve the above-mentioned problem, a first aspect of the present invention provides a cable holding tool for holding a cable passing through a wiring opening, the cable holding tool comprising: a soft member having first and second opposing surfaces; a first sealing member having a fluff and attached to the first opposing surface; and a second sealing member having a fluff and attached to the second opposing surface, wherein when a cable is sandwiched between the first sealing member and the second sealing member, the fluff of the first sealing member and the fluff of the second sealing member are in contact with each other. 
     According to the first aspect of the present invention, the first and second sealing members having the fluffs are attached to the first and second opposing surfaces of the soft member, and the cable is sandwiched between the fluff of the first sealing member and the fluff of the second sealing member, and therefore, a size of the gap formed at a position where the first and second sealing members are sandwiching the cable can be reduced to thereby increase air-tightness thereat. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure is described in conjunction with the appended figures: 
         FIG. 1  is a perspective view of a working machine to which a cable holding tool of a first embodiment of the present invention is attached. 
         FIG. 2  is a perspective view of a back surface side of the working machine of  FIG. 1 . 
         FIG. 3  is a detailed view of a wiring opening of a control room of the working machine of  FIG. 1 . 
         FIG. 4  is a perspective view of the cable holding tool of the present embodiment as viewed from an inner side of a housing. 
         FIG. 5  is a perspective view of the cable holding tool of the present embodiment. 
         FIG. 6  is an exploded perspective view of the cable holding tool of the present embodiment. 
         FIG. 7  is a cross-sectional view of first and second sealing members of the present embodiment. 
         FIG. 8  is a cross-sectional view along VIII-VIII of  FIG. 4 . 
         FIG. 9  is a perspective view of a cable holding tool of a second embodiment of the present invention. 
         FIG. 10  is a plan view of a conventional cable holding tool. 
         FIG. 11  is a perspective view of the conventional cable holding tool. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A first embodiment of a cable holding tool of the present invention is described based on the attached drawings below.  FIG. 1  shows a perspective view of a front surface side of a working machine to which the cable holding tool of the present embodiment is attached. The working machine includes a workshop  11  housing processing machinery for machining workpieces, and a control room  12  housing control devices for controlling the processing machinery. The control room  12  is attached to a back surface of the workshop  11 . Note that in  FIG. 1 , the reference numeral  13  represents a door for inserting and removing the workpieces, the reference numeral  14  represents an operation panel, the reference numeral  15  represents an inspection opening, and the reference numeral  16  represents a coolant tank. 
       FIG. 2  shows a perspective view of a back surface side of the working machine. The processing machinery in the workshop  11  and the control devices in the control room  12  are connected by cables  17 . A wiring opening  11   a  through which the cables  17  are passed is opened in a housing of the workshop  11 . A wiring opening  12   a  through which the cables  17  are passed is opened in a housing of the control room  12 . Furthermore, a wiring opening  12   b  through which cables  18  for connecting to an external power supply is passed is also opened in the housing of the control room  12 . 
       FIG. 3  shows a detailed view of the wiring opening  12   a  of the control room  12 . The processing machinery and the control devices are connected by various kinds of the cables  17  such as a power cable and a control cable. The wiring opening  12   a , which is square shaped for example, is opened in the housing  20  of the control room  12 . A cable holding tool  21  (see  FIG. 4 ) for holding the cables  17  and also sealing the wiring opening  12   a  is attached to an inner side of the housing  20 . The cable holding tool  21  also functions to bend the cables  17  at 90 degrees. 
       FIG. 4  shows a perspective view of the cable holding tool  21  as viewed from the inner side of the housing  20 . The cable holding tool  21  is configured by combining two members, namely a base part  22  and a cover part  23 . The base part  22  is attached to the housing  20  by fastening members such as screws. The cover part  23  is removably attached to the base part  22 . The cables  17  are fixed to the base part  22  by cable fasteners  19 . 
       FIG. 5  shows a perspective view of the cable holding tool  21  with the cover part  23  removed from the base part  22 . The base part  22  includes a first support member  24  made from a metal frame body surrounding the wiring opening  12   a  (see  FIG. 3 ), a first soft member  25  adhered to the first support member  24 , and a first sealing member  26  adhered to the first soft member  25 . The cover part  23  includes a box-shaped second support member  27  made of a synthetic resin and removably attached to the base part  22 , a second soft member  28  adhered to the second support member  27 , and a second sealing member  29  adhered to the second soft member  28 . 
       FIG. 6  shows an exploded perspective view of the base part  22  and the cover part  23 . A rectangular opening  24   a  matching the wiring opening  12   a  (see  FIG. 3 ) is formed in the first support member  24  of the base part  22 . The first support member  24  has, in an integrated manner, a seal support part  24   b  extending along a long side of the rectangular opening  24   a , and a cable support stand  24   c  bent with respect to the seal support part  24   b  at 90 degrees. The first soft member  25  is attached to the seal support part  24   b . The cable fasteners  19  (see  FIG. 4 ) are fixed to the cable support stand  24   c . A shape of the first support member  24  is left-right symmetrical. Cover guide walls  31  are integrally formed at both right and left sides of the first support member  24 . Each cover guide wall  31  has guide grooves  33   a ,  33   b  for guiding guide projections  32   a ,  32   b  of the cover part  23 , and a standing piece  34  for positioning the cover part  23 . A frame-shaped packing  35  is attached to a lower surface of the first support member  24  of the base part  22  to seal between the housing  20  and the first support member  24 . 
     The first soft member  25  is formed in a long and narrow rectangular solid shape, and is attached to the seal support part  24   b  so as to extend along the long side of the rectangular opening  24   a . The first soft member  25  is made from a soft, porous foamed body, and is made from, for example, a sponge obtained by foam molding a synthetic resin such as urethane, a rubber sponge obtained by using rubber as a raw material, and the like. 
     In  FIG. 6 , a side surface  25   a  of the first soft member  25  (this side surface  25   a  is referred to as a first planar part  25   a ), and an upper surface  25   b  of the first soft member  25  (this upper surface  25   b  is referred to as a second planar part  25   b ) configure a first opposing surface. The first planar part  25   a  and the second planar part  25   b  are orthogonal to each other, and first sealing members  26   a ,  26   b  are attached to the first and second planar parts  25   a ,  25   b.    
     The second support member  27  of the cover part  23  has a seal housing part  36  formed in a box shape, the guide projections  32   a ,  32   b , and hooks  37 . Second soft members  28   a ,  28   b  are attached to an inner wall of the seal housing part  36 . The second soft members  28   a ,  28   b  are both formed as long and narrow rectangular solids. Similar to the first soft member  25 , the second soft members  28   a ,  28   b  are also made from soft, porous foamed bodies. 
     A side surface  28   a   1  of the second soft member  28   a  (this side surface  28   a   1  is referred to as a third planar part  28   a   1 ) is parallel to the first planar part  25   a  of the first soft member  25 . A side surface  28   b   1  of the second soft member  28   b  (this side surface is referred to as a fourth planar part  28   b   1 ) is inclined with respect to the third planar part  28   a   1  at 40 to 60 degrees so as to approach the first soft member  25 . The third planar part  28   a   1  and the fourth planar part  28   b   1  configure a second opposing surface. Second sealing members  29   a ,  29   b  are attached to the third and fourth planar parts  28   a   1 ,  28   b   1 . 
     A shape of the second support member  27  is left-right symmetrical. The guide projections  32   a ,  32   b  and the hook  37  of the second support member  27  are arranged at each of the right and left sides of the second support member  27 . When the guide projections  32   a ,  32   b  of the second support member  27  are fitted into the guide grooves  33   a ,  33   b  of the first support member  24 , and the second support member  27  is moved in one direction (a direction along a short side of the rectangular opening  24   a ) to a predetermined position while bending the hooks  37 , the hooks  37  are restored due to an elastic force thereof such that triangular claws  37   a  of the hooks  37  catch on the standing pieces  34  of the first support member  24 . In this way, the second support member  27  is fixed to the first support member  24 . A plurality of claws  37   a  are formed in the hooks  37  such that a position of the second support member  27  can be adjusted in multiple steps. A U-shaped packing  38  is attached to a lower surface of the second support member  27  to seal between the first support member  24  and the second support member  27 . 
       FIG. 7  shows a cross-sectional view of the first and second sealing members  26 ,  29 . The first and second sealing members  26 ,  29  have the same configuration. Each of the first and second sealing members  26 ,  29  includes a pile yarn  41  as the fluff, a base fabric  42  to support the pile yarn  41 , and a coating layer  43  to prevent the pile yarn  41  from falling off. The base fabric  42  is a textile or knitted fabric obtained by weaving a weft  42   a  and a warp  42   b . The pile yarn  41  is pile weaved to the base fabric  42 . The pile yarn  41  is formed in a loop shape or in a cut shape obtained by cutting loops ( FIG. 7  shows the pile yarn  41  having the cut shape) to thereby have flexibility. The coating layer  43  is formed by applying a coating agent to the base fabric  42  from a back surface thereof. The first and second sealing members  26 ,  29  are adhered to the first and second soft members  25 ,  28  by an adhering means such as a double sided tape and an adhesive. Note that adherence can also be done using the coating layers  43  of the first and second sealing members  26 ,  29 . 
     A material of the fibers of the base fabric  42  is not particularly limited, and can contain, for example, 55% of acrylic and 45% of polyester. A length, warp, and density of the fibers of the pile yarn  41  are also not particularly limited, and, for example, the length of the pile (fluff portion) can be 3 mm to 30 mm; the fineness of the fibers can be 0.8 denier to 15 denier, the density of the fibers can be 16 gauge to 22 gauge per inch in a width direction, and the mesh number in a longitudinal direction can be 16 to 32 meshes per inch. If oil is coated onto the pile yarn  41  such that the pile yarn  41  contains the oil, penetration of air containing oil, coolant fluid, dust or the like can be effectively prevented. As the oil, silicone-based oil and fluorine-based oil can be used for example. 
       FIG. 8  shows a cross-sectional image of the cable holding tool  21  with the cover part  23  fixed to the base part  22 . When the cover part  23  is fixed to the base part  22 , the cables  17  are sandwiched between the first sealing members  26   a ,  26   b  attached to the first soft member  25  and the second sealing members  29   a ,  29   b  attached to the second soft members  28   a ,  28   b . At this time, the pile yarn  41  of the first sealing member  26  and the pile yarn  41  of the second sealing member  29  are in contact with each other. The first soft member  25  and the second soft member  28  are softer than the first support member  24  made of the metal and the second support member  27  made of the resin, which support the first and second soft members  25 ,  28 , and therefore the first soft member  25  and the second soft members  28   a ,  28   b  elastically deform. Even if the first and second soft members  25 ,  28   a ,  28   b  elastically deform, the pile yarns  41  of the first sealing members  26   a ,  26   b  and the pile yarns  41  of the second sealing members  29   a ,  29   b  seal the gaps which are formed along circumferences of the cables  17 . Therefore, a cable holding tool  21  having a high level of air-tightness is obtained. 
     Furthermore, by providing the first soft member  25  with the first and second planar parts  25   a ,  25   b  (see  FIG. 6 ) orthogonal to each other, and by providing the second soft member  28   a  with the third planar part  28   a   1  parallel to the first planar part  25   a  and with the fourth planar part  28   b   1  inclined with respect to the third planar part  28   a   1 , the pile yarns  41  of the first sealing members  26   a ,  26   b  attached to the first and second planar parts  25   a ,  25   b  and the pile yarns  41  attached to the third and fourth planar parts  28   a   1 ,  28   b   1  can come in contact with each other. Therefore, even if the cables  17  are bent at 90 degrees, the air-tightness of the cable holding tool  21  can be improved. 
       FIG. 9  shows a perspective view of a cable holding tool according to a second embodiment of the present invention. With the above-described first embodiment, the first soft member  25  and the second soft member  28  are separated from each other, however in this embodiment, there exist only one soft member  51  which is made from a single component. As can be seen from this figure, a slit  52  is made at a center of the soft member  51 . Wall surfaces defining the slit  52  configure first and second opposing surfaces  53   a ,  53   b . Semicircular indentations  54  are formed on the first and second opposing surfaces  53   a ,  53   b  of this embodiment at positions where the cables  17  are sandwiched there-between. First and second sealing members  55   a ,  55   b  are attached to the first and second opposing surfaces  53   a ,  53   b . The reference numeral  56  in  FIG. 9  represents a boundary between the first and second sealing members  55   a ,  55   b . The soft member  51  is covered by case half bodies  58   a ,  58   b  as first and second support members divided into two. Screw holes for attachment to the housing  20  are formed in the case half bodies  58   a ,  58   b . As with this embodiment, the soft member  51  can also be configured from the single component. 
     Note that the present invention is not limited to the above-described embodiments, and may be changed to various embodiments without changing the scope of the present invention. 
     With the above-mentioned embodiment, the cable holding tool that bends the cables at 90 degrees was described, but the cables may be linearly extended as well. 
     With the above-mentioned embodiments, examples for which the cable holding tool is attached to the housing of the control room of the working machine were described, but the cable holding tool can also be attached to the housing of the workshop of the working machine. 
     The cable holding tool of the present invention can be attached to not only the working machine, but also various machinery such as transportation machinery, construction machinery, agricultural machinery, woodworking machinery, robots, semiconductor manufacturing equipment or liquid crystal manufacturing equipment, or buildings and the like. 
     The present specification is based on Japanese Patent Application No. 2014-101392 filed May 15, 2014. The details described herein are all included therein.