Patent Publication Number: US-2021190115-A1

Title: Clip

Description:
TECHNICAL FIELD 
     The present invention relates to a clip. 
     BACKGROUND 
       FIG. 11( a )  shows a clip (push-rivet) disclosed in Patent Document 1, and  FIG. 11( b )  shows a clip (grommet) in Patent Document 2. Each clip comprises a pin including a head portion and a shaft portion provided under the head portion, and first engaged portions and second engaged portions both being formed on the shaft portion, and a grommet having a flange with an insertion hole, and a leg portion provided to project under the flange and engaging portions engaging with and disengaging from the respective engaged portions. 
     Hereunder, both Patent Documents will be explained in detail. As an important part of the Patent Document 1, the grommet  1  includes engaging portions (engaging projections)  19  provided at inner faces of the ends of leg portions  14 , and a pin insertion depression  12  provided on an upper surface of a flange portion  11 . A pin  2  includes first engaged portions (engaging depressions)  26  for temporary fixing, engaging the engaging portions  19  during insertion into the leg portions  14  of a shaft portion  22 , and second engaged portions (engaging projections)  27  for permanent fixing, engaging the engaging portions  19  by inserting the shaft portion  22  further inside the shaft portion  22  from the temporary fixing condition where the engaging portions  19  are temporary fixed with the first engaged portions. The grommet  1  and the pin  2  include a tool insertion space  3  between a head portion  21  and the flange portion  11  used when the head portion  21  is inserted into the pin insertion depression  12 . And, the clip is changed from the temporary fixing condition where relative to the grommet  1 , the engaging portions  19  engage the first engaged portions  26 , to the using condition where the leg portions  14  elastically open to the shaft outer diameter by inserting the pin  22  into the leg portion, and becomes the permanent fixing condition where the leg portions  14  are kept in the using condition by engaging the engaging portions  19  with the second engaged portion  27 . 
     Also, as an important part of the Patent Document 2, a grommet (main body)  2  includes projections provided at a top inner faces of a leg portion  21 , i.e. divided leg pieces  214 , a first abutment portion provided at a part of the leg pieces  214  and second abutment portions provided at the rest of the leg pieces  214  among the plurality of leg pieces  214 , and engaging portions (fixed portions) provided at an inner side of the hole of the flange portion (head portion). A pin (shaft portion)  1  includes first engaged portions (fixing portions) for temporary fixing, engaging the engaging portions during insertion of the shaft portion (main body portion) into the leg portion  21 , and second engaged portions (additional fixing portions) for permanent fixing, engaging the engaging portions by inserting the shaft portion from the temporary fixing condition where the engaging portions engage the first engaged portions to further into the leg portion. The clip becomes the temporary fixing condition where the first engaged portions engage the engaging portions at an initial condition where the shaft portion (main portion) is inserted into the leg portion  21 , and by further inserting the shaft portion, parts of the leg pieces  214  elastically open by the first abutment portions press-contacting the projections, and then, the rest of the leg pieces  214  elastically opens by the second abutment portions elastically contacting the projections. By further inserting the shaft portion, the engaging portions engage the second engaged portions to become the permanent fixing condition where the leg portions  21  are kept in the use condition. 
     PRIOR ART DOCUMENT 
     Patent Document
     Patent Document 1: Japanese Utility Model Publication No. H6-40428   Patent Document 2: Japanese Patent No. 5627940   

     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     In the above clips, for example, in a use condition where a plate on a main body side, such as a panel, is fixed to a plate on an attachment side, such as a cover, it is necessary to remove the plate on the attachment side for repair or replace of a part on the main body side, so that the permanent fixing condition is sometimes changed again to the temporary engaging condition. In that case, in the clip of the Patent Document 1, when a removing operation by a tool  8  inserting into the space  3  of the pin  2  in the permanent engaging portion, i.e. the tool  8  inserting into the space  3 , is moved, the pin  2  is slightly pulled so that the engaging portions  19  are released from the engagement. Thereafter, when the pin  2  is pulled by using the head portion  21 , it returns to the temporary fixing condition where the engaging portions  19  engage the first engaged portions  2 . In the Patent Document 2, there is no explanation as to the change from the permanent fixing condition again to the temporary fixing condition, as in the Patent Document 1, generally, when a tool, such as a driver, is moved down in a condition where the tool is forcibly inserted between a concave bottom of the flange portion  20  and the head portion  13 , the pin  1  is slightly pulled out, so that the engaging portions  20   b  are engage-released from the second engaged portion  27 . Thereafter, upon the pin pulling out operation by using the head portion  13 , it returns to the temporary fixing condition where the engaging portions  20   b  engage the first engaged portions  14 . 
     However, in the above operation changing from the permanent fixing condition to the temporary fixing condition, an end of the tool, such as a driver, is inserted into the lower side of the head portion, and the end of the tool, as a fulcrum, must be inclined or the head portion must be pulled out. Thus, the operation efficiency is not good and troublesome. In this respect, in case of using many clips and an operation space is limited, this causes a big problem. Also, in the clip of the Patent Document 1, since the engaging portions are formed at the ends of the leg portions, the leg enlargement amount in the elastic opening state of the legs at the pin inserting time inserting the pin into the legs cannot be made large, and tolerance relative to the opening diameter for the attachment hole and the plate thickness is small. 
     In view of the above background, an object of the invention is to enlarge tolerance relative to the opening diameter for the attachment hole and the plate thickness in case of, for example, fixing a main body side plate to an attachment side plate or fixing plates each other, and to securely and effectively change the permanent fixing condition where the leg portions are opened by inserting the pin into the grommet to the temporary fixing condition. Other objects will be apparent in the following descriptions. 
     Means for Solving the Problems 
     In order to attain the above objects, the clip of the present invention comprises a pin including a head portion and a shaft portion provided under the head portion, a first engaged portion and a second engaged portion both being provided on the shaft portion; and a grommet having a flange with an insertion hole, a leg portion projecting from a lower surface of the flange and an engaging portion engaging with and disengaging from the respective engaged portions, the clip changing a temporary fixing condition where the engaging portion engages the first engaged portion in a course of arranging the pin to the grommet such that the shaft portion is inserted into the leg portion through the insertion hole, to a permanent fixing condition where the engaging portion is engaged with the second engaged portion after the leg portion is elastically enlarged by further insertion of the shaft portion, wherein the grommet include the engaging portion around an inner periphery of the insertion hole of the flange, the pin includes a guide groove formed between the first engaged portion of the shaft portion and the second engaged portion and guiding movement of the pin in a condition of slidably engaging the engaging portion, and the temporary fixing condition and the permanent fixing condition are changed by the movement of the shaft along guiding of the guide groove, and by an upward movement of the pin from the permanent fixing condition along with the rotation of the pin and guiding of the guide groove, the engaging portion is able to engage the first engaged portion by releasing engagement of the engaging portion with the second engaged portion. 
     The clip of the invention is used in a case where a plate portion of an attachment side portion is fixed to a plate portion, such as a panel and so on, on a main body side, or fixing the plates in a condition piled together. The plates may be three or more plates. Also, in the permanent fixing condition, the engaging portion of the grommet is engaged with the second engaged portion of the pin, wherein the leg portion of the grommet is enlarged and is kept in the enlarged state. In the temporary fixing condition, the first engaged portion of the pin is not accidentally separated from the engaging portion of the grommet, and the leg portion of the grommet is reduced as in the case the grommet is molded. Namely, the pin and grommet are temporary fixed after molding in order not to be easily separated from each other, and are designed to be inserted into the attachment holes for the plates and removed therefrom as an assembly. 
     The above invention may be embodied as explained below. 
     (A) The guide groove includes a linear groove portion extending along an axial direction of the shaft portion, and a curved groove portion continuous to an upper groove portion of the linear groove portion. In this configuration, for example, it is possible to change from the temporary fixing condition to the permanent fixing condition by the pin moving linearly along the linear groove portion in a condition that the pin engages the engaging portion, and when the pin is rotated for a predetermined angle in the permanent fixing condition, after the second engaged portion is engage-released, it is possible to move the pin for the predetermined distance in the pulling up direction. 
     (B) The second engaged portion is connected to the curved groove portion, and by rotating the pin in a condition of engaging with the engaging portion, the engaging portion moves to a curved groove side to be able to release engagement. In this configuration, by only rotating the pin for the predetermined angle in the permanent fixing condition, the engagement of the second engaged portion relative to the engaging portion is securely released. 
     (C) The first engaged portion and the second engaged portion are formed to correspond to two ends of the guide groove in a longitudinal direction. In this configuration, since the first engaged portion and the second engaged portion are formed at the two ends corresponding to the two ends of the linear groove portion, by forming the first engaged portion with respect to the linear groove portion only with a space or the second engaged portion with respect to the linear groove portion only with a projection, the temporary fixing condition can be made by inserting the pin to the grommet or the click feeling can be provided when changing from the temporary fixing condition to the permanent fixing condition, to thereby improve using convenience. 
     (D) The first engaged portion is formed to a concave portion provided at a lower end of the linear groove portion or at the lower end with a space therebetween. In this configuration, when the first engaged portion is the concave portion, for example provided at the linear groove portion with a space, or at the lower end of the linear groove portion, it is sufficient to form the depth shallow before the concaved portion. Then, the above click feeling can be easily provided. 
     (E) The second engaged portion includes a projection located on an extension line of the linear groove portion and connecting with the curved groove portion, and is able to engage with the engaging portion by the engaging portion riding over the projection from the linear groove portion side by inserting the pin. In this configuration, for example, it is possible to easily form by only adding the projection to the second engaged portion, and to judge the change to the permanent fixing condition by the above click feeling. 
     (F) When the pin is rotated to the grommet for a predetermined angle (for example, 30 degrees) by removing operation from the permanent fixing condition of the pin, the engagement of the engaging portion with the second engaged portion is released, and when the pin is further rotated for a predetermined angle (for example 60 degrees) in a peripheral direction, the pin is pulled up for a predetermined length. In this configuration, when the pin is rotationally operated in the permanent fixing condition, the engagement of the engaging portion with the second engaged portion is released to be further pulled, and thereafter, by pulling up the pin with pinching the head portion, it is possible to change again to the temporary fixing condition. Incidentally, as a tool to rotate the pin, it is considered that as in an embodiment, a rotation operation is made by forming the head portion to have an insertion groove in a head portion and inserting a tool, such as a driver, to the insertion groove, or the head portion is formed to have a thickness such that a part of the head portion projects from the concave portion in a permanent fixing condition, and the projected portion is rotated in the condition that the projected portion is engaged with a special tool. 
     Advantages of the Invention 
     In the clip of the invention, in case of changing the clip or the pin from the permanent fixing condition to the temporary fixing condition, by only rotation operation of the pin for the predetermined angel, the second engaged portion is engage-released from the engaging portion, so that the pin is pulled up for the predetermined length along with the guiding operation of the guide groove. Thus, it is possible to quickly and securely change even in a narrow place or a place where the pin can not be seen. Also, in the conventional clip, since the leg portion returns to the original condition when the permanent fixing condition comes close to the temporary fixing condition, the pin is apt to rotate relative to the attachment hole. However, in the present invention, when the pin is rotated for the predetermined angel (in the embodiment, 90 degrees), the pin is pulled out above the flange up to the predetermined length, i.e. to the length enable to grip the head portion. Thus, it is not affected by the rotation relative to the attachment hole, and the invention is superior in this respect. 
     Also, in the clip of the invention, as compared with the clip in the Patent Document 1, the engaging portion at the grommet side engaging with and disengaging from the respective engaged portions of the pin is not formed on the leg portion, and is formed at the inner periphery of the insertion hole of the flange, and when the pin is all the way inserted to the end, the enlarged diameter or expansion amount of the leg is made larger. Thus, tolerance relative to the plate thickness of the plate and the hole diameter of the attachment hole is made relatively great. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an outer configuration of a clip of the invention showing a condition separated to a pin and a grommet. 
         FIGS. 2( a ) and 2( b )  show a pin temporary fixing condition relative to a grommet as the above clip, wherein  FIG. 2( a )  is a plan view, and  FIG. 2( b )  is a front view (seen from a Z direction of  FIG. 7( a ) ). 
         FIGS. 3( a ) and 3( b )  show a pin permanent fixing condition relative to the grommet as the above clip, wherein  FIG. 3( a )  is a front view, and  FIG. 3( b )  is an explanatory vertical sectional view of  FIG. 3( a ) . 
         FIG. 4  is an explanatory view of sectioning the grommet in the pin permanent fixing condition. 
         FIGS. 5( a ) to 5( d )  show the single pin, wherein  FIG. 5( a )  is a plan view,  FIG. 5( b )  is a front view,  FIG. 5( c )  is a bottom view, and  FIG. 5( d )  is a right side view. 
       In  FIG. 6 , (a) is a cross-sectional view of A-A in  FIG. 5( b ) ,  FIG. 6( b )  is a cross-sectional view of B-B in  FIG. 5( d ) ,  FIG. 6( c )  is an enlarged cross-sectional view of C-C in  FIG. 5( d ) , and  FIG. 6( d )  is an enlarged cross-sectional view of D-D in  FIG. 5( d ) . 
         FIGS. 7( a ) to 7( d )  show the single grommet, wherein  FIG. 7( a )  is plan view,  FIG. 7( b )  is a front view,  FIG. 7( c )  is a bottom view, and  FIG. 7( d )  is a view seen from a Z-direction in  FIG. 7( a ) . 
       In  FIG. 8 , (a) is a cross-sectional view of E-E in  FIG. 7( a ), ( b )  is a cross-sectional view of F-F in  FIGS. 7( a ), and ( c )  is a cross-sectional view of G-G in  FIG. 7( a ) . 
         FIGS. 9( a ) to 9( c )  show an operation  1  of the clip, wherein Fi.  9 ( a ) is an explanatory view showing a pin temporary fixing condition relative to the grommet,  FIG. 9( b )  is an explanatory view showing a middle of insertion of the pin, and  FIG. 9( c )  is an explanatory view of a pin permanent fixing condition relative to the grommet. 
         FIGS. 10( a ) to 10( c )  show an operation  2  of the clip, wherein  FIG. 10( a )  is an explanatory view showing a middle of release of engagement of the pin from the pin permanent fixing condition,  FIG. 10( b )  is an explanatory view showing completion of the release of engagement of the engaging portions, and  FIG. 10( c )  is an explanatory view showing a condition returning to the pin temporary fixing condition. 
       In  FIG. 11 , (a) shows a clip structure of the Patent Document 1, and  FIG. 11( b )  shows a clip structure of the Patent Document 2. 
     
    
    
     EMBODIMENTS OF THE INVENTION 
     Hereinafter, the configuration of the clip of the invention is explained with reference to the drawings. In the explanation, after explaining the structure of the clip in detail, the main operation is clarified. Incidentally, the size of the clip is arbitrary, but the drawings are enlarged to easily understand in the drawings. Also, in  FIGS. 9( b ), 9( c ) and 10( a ), 10( b ) , portions of the enlarged portions and so on of the legs are simplified for limitation on the drawings. 
     (Structure) A clip  3  of the embodiment comprises a pin  1  including a head portion  10 , a shaft portion  13  formed under the head portion, first engaged portions  16  and second engaged portions  19 , both being formed on the shaft portion  13 , and a grommet including a flange  20  with an insertion hole  23 , a leg portion  25  with, generally, a cylindrical shape projecting from a lower surface of the flange  20 , and engaging portions  24  engaging with and disengaging from the engaged portions  16 ,  19 . The clip  3  is the same as the conventional one in the point that the clip  3  can be changed to a temporary fixing condition where the engaging portions  24  engage the first engaged portions in the middle of inserting the pin  1  to the grommet  2  while the shaft portion  13  enters the leg portion  25  through the insertion hole  23 , and a permanent fixing condition where the engaging portions  24  engage the second engaged portions  19  after further inserting the pin to the leg portion  25  to elastically enlarge the leg portions  25 . The inventive point resides in the structure of the engaging portions  24  formed in the grommet  2 , and guide grooves  15  formed on the shaft portion  13  and guiding a linear movement of the pin  1  in a condition of slidably engaging with the engaging portions  24 . Hereinafter, the detailed structure is made clear. 
     First, the pin  1  is an injection molded product made of resin, and as shown in  FIG. 1  to  FIG. 5( d ) , the head portion  10  has, generally, a disc shape, and the shaft portion  13  projects generally in a columnar form through a large diameter portion  13   a  from the center of the lower surface of the head portion. The head portion  10  includes an insertion groove  11  in a cross shape formed in the upper center thereof, and a pair of cam projections  12  formed underneath at a lower peripheral side. The insertion groove  11  is rotated in a condition that a tool, such as a driver, is engaged, so that the pin  1  permanently fixed to the grommet  2  to a desired angle. As shown in  FIGS. 5( b ) and 5( c ) , the cam projections  12  are arranged to face each other with the shaft portion  13  therebetween. Each projection  12  is formed such that one of two vertical faces arranged in the peripheral direction is formed vertically, and the other face is formed to an inclined face from the lower side of the vertical face to an inclined face in an obliquely upper direction. The large diameter portion  13   a  is formed to be slightly larger than the shaft portion  13 , and is connected to the shaft portion  13  through a tapered portion. Incidentally, the large diameter portion  13   a  and the tapered portion may be recognized as a part of the head portion  10 , not a part of the shaft portion  13 . 
     The shaft portion  13  becomes an included face  13   b  formed such that as it goes to an end in the columnar shaft, the diameter becomes gradually small. Also, the shaft portion  13  includes a pair of wings  14  provided at the end side of the inclined face  13   b , guide grooves  15  guiding the linear movement of the pin  1  in a condition engaging with the engaging portions  24 , first engaged portions  16  temporary fixing the pin  1  in a condition of engaging with the engaging portions  24  with respect to the grommet  2 , step portions  17  formed to keep with a slight space with respect to the first engaged portions  16  as shown in  FIG. 5( b )  and the guide grooves  15  as shown in  FIG. 5( d ) , second engaged portions  19  engaging the pin  1  permanently in a condition of engaging with the engaging portions  24  with respect to the grommet  2 , and projections  18  provided between the guide  15  and the second engaged portions  19 . 
     In this structure, the pair of wings  14  has a thickness slidably engaging the slit  27  dividing a leg portion  25  explained later to a plurality of leg pieces  26 . And, each wing  14  is designed to see a relative position of the pin  1  to the grommet  2  in an assembling operation of the pin  1  to the grommet  2 , and to guide in a condition of engaging with the slit  27  until it comes to the temporary fixing condition by inserting the pin  1  to the grommet  2 . Also, each wing  14  is formed to have an inclined portion at upper and lower corners. This is made not to receive resistance when inserting the pin  1  from the insertion hole  23  of the grommet  2  to the leg portion  25 , and on the contrary when removing from the grommet  2 . Incidentally, the wing  14  of itself may be eliminated. 
     The guide grooves  15 , the step portions  17 , the projections  18  and the second engaged portions  19  are located around the shaft portion  13 , and provided at four portions located on the same axial line and equally divided on the periphery. Here, the guide groove  15  includes a linear groove portion  15   a  extending in the axial direction formed between the first engaged portion  16  and the second engaged portion  19 , and a curved groove portion  15   b  in a curved shape formed next to the linear groove portion  15   a . The linear groove portion  15   a  has a groove width such that the grommet side engaging portion  24  can relatively freely engage, explained later. Also, among the four linear groove portions  15   a , a pair of linear groove portions  15   a ,  15   a  facing each other as shown in  FIG. 5( b ) , and another pair of linear groove portions  15   a ,  15   a  facing each other as shown in  FIG. 5( d )  are different at the following points. 
     Namely, the linear groove portions  15   a ,  15   a  as shown in  FIG. 5( b )  are shorter than the linear groove portion  15   a  as shown in  FIG. 5( d ) , and must require depressions which are the first engaged portions  16  formed on the same axial line with a slight space therebetween. Also, the lower end side of the linear groove portion  15   a  is formed to be an inclined portion  15   c  which is formed higher as it goes to the lower end. In the structure, the engaging portion  24  moves relatively along the linear groove portion  15   a , as explained later, and after riding over from the inclined portion  15   c  to the shaft peripheral surface with an elastic deformation, when detachably engaging the depression which is the engaged portion  16 , it provides a click feeling. In the click feeling, an operator notices that it is changed to the temporary fixing condition. Incidentally, the linear groove portion  15   a  in  FIG. 5( d )  has the height same as the depression where the groove end is the first engaged portion  16 , namely the distance from the axial end is the same position. Also, the first engaging portion  16  may be, for example a linear groove portion  15   a  as shown in  FIG. 5( d )  and have a slightly higher step portion before the groove lower end corresponding to the depression. In this structure, when the engaging portion rides over the step portion, it also provides the click feeling as well. 
     The curved groove portion  15   b  is provided to extend from an upper side groove portion of the linear groove portion  15   a , and as a width size of the linear groove portion  15   a , as compared with the lower side groove width, the upper side groove width of the linear groove portion is made wide corresponding to the groove width of the curve groove portion. In this structure, when the pin  1  in the permanent fixing condition where the pin  1  engages the engaging portion  24  at the second engaged portions  19  as shown in  FIG. 9( c )  is rotated for a predetermined angle (for example, about 30 degrees) in the counter-clockwise direction as shown in  FIG. 10( a ) , the second engaged portion (projection) disengages from the engaging portion, and the engaging portion  24  is located in the groove width widened in the curved groove portion  15   b  to be able to become disengagement. When the pin is further rotated for a predetermined angle (for example, about 90 degrees) in the counter-clockwise direction as shown in  FIGS. 10( b ) , the engaging portion moves to the upper end of the linear groove portion from the curved groove portion, for example abutting against the curved portion  18   a  of the projection  18 , so that while the pin  1  is moving upwardly, it is possible to be located to the linear groove portion  15   a  under the projection  18 . Also, in this structure, for example, in the condition that the engaging portion  24  is located in the groove width widened in the cured groove portion  15   b , when the pin  1  is moved upward by the cam operation of the cam projections  12 ,  22 , explained later, the engaging portion  24  is induced by the curve of the curved groove portion  15   b , so that it is possible to engage the linear groove portion  15   a  immediately under the projection  18 . Incidentally, in  FIGS. 9( b ), 9( c ), 10( a ), 10( b ) , the leg pieces are widened, but are omitted. 
     The step portions  17 , as shown in  FIG. 6( d ) , are provided around the shaft periphery in the circular shape, and are spaced slightly from the guide grooves  15  and are formed with a shallow reduce portion in about L-shape immediately under the guide grooves  15 . The step portions  17 , as shown in  FIG. 4 , keep the permanent fixing condition stably by engaging the leg side pressure projections  26   c  of the grommet  2  with a predetermined pressure in the permanent fixing condition, as explained later. Incidentally, the pressure projection  26   c  rides up onto the shaft periphery from the plan surface of the step portion with an elastic displacement when the permanent fixing condition where the engaging portion  24  engages the second engaged portion  19  is released for disengagement by rotating the pin  1 . At that time, it provides the click feeling. 
     Projections  18  are formed at the upper ends of the linear groove portions  15   a  and are connected to the curved groove portions  15   b . The projection  18  is plan at an upper surface, and a side surface at the curved groove portion  15   b  is formed to be an arc portion  18   a . The arc portion  18   a  helps leading the engaging portion  24  to a side of the linear groove portion  15   a  while moving the pin  1  upwardly when contacting the engaging portion  24  by rotation of the pin  1 . 
     The second engaged portion  19  is located at an extension line of the linear groove portion  15   a , is connected to the curved groove portion  15   b  at a circumference direction, and is separated at upper and lower portions by the projection  18  and a tapered portion of the large diameter portion  13   a  at the head side. Also, when the pin  1  is inserted into the grommet  2 , the engaging portion  24  is engageable with the second engaged portion  19  by riding over the projection  18  from the linear groove portion  15   a.    
     On the other hand, the grommet  2  is an injection molded product made of resin, and, as shown in  FIG. 1  to  FIG. 8( b ) , includes a flange portion  20  with about a disc shape, and a leg portion  25  with about a cylindrical shape projecting from a lower center portion of the flange portion  20 . The flange portion  20  comprises a concave portion  21  receiving the head portion  10 , cam projections  22  provided on an inner bottom of the concave portion  21 , an insertion hole  23  provided in the center of the inner bottom of the concave portion  21 , the engaging portions  24  formed near the insertion hole  23 , and ribs  20   a  formed to project under the bottom surface. 
     In these members, the cam projections  22  are located in the inner bottom face as shown in  FIG. 7( a ) , and arranged plurally (four in this example) around the insertion hole  23 . In each cam projection  22 , as shown in  FIGS. 8( a ) to 8( c ) , in the peripheral direction, one end side is formed with an inclined face, and the other end side is formed vertically. In a cam operation, in a condition that the head portion  10  is received in the concave portion  21 , the cam projection  12  at the head side is located in a lower portion between the cam projections  22  in the concave side, and when the pin  1  is rotated, the cam projection  12  moves along the cam projection  22  corresponding thereto, so that the pin  1  is raised upward to the height corresponding to the inclined surface. 
     The insertion hole  23  extends to the cylindrical inner side of the leg portion  25 . The engaging portions  24  are formed at four positions equally dividing the hole periphery at the hole underside of the insertion hole  23 , and are projections with a size freely movably engaging the guide groove  15  of the pin. Also, the projection of the engaging portion  24  is plane at a lower side, and is formed at an upper side to have an inclined face which becomes a larger diameter as it goes upward communicating with the insertion hole  23 . This shape, as assumed from  FIGS. 9( a ) to 9( b ) , helps preventing accidental disengagement even if a force is applied to the pin upwardly in a condition that the engaging portion  24  engages the second engaged portion  19 , engaging easily through the inclined surface when the engaging portion  24  engages the second engaged portion  19  riding over the projection  18  upon insertion of the pin  1 , and accidentally releasing the engagement even if the pressure in the lower direction is applied to the pin in the permanent fixing condition. 
     The ribs  20   a  (refer to  FIG. 2( b ) ) are, under the lower surface of the flange portion, arranged in about a cross shape except for the center portion corresponding to the leg portion  25 , and as supposed from  FIG. 4 , operate such that the flange portion  20  is stably retained on the side plate  5  at the attachment portion side in the using condition of the clip  3 . Incidentally, as a modified example, the ribs  20   a  may be omitted, or the flange portion  20  may be retained through a seal portion relative to the side plate  5 . 
     The leg portion  25  has about a cylindrical shape, and is divided into four leg pieces  26  by a cross shape slit  27 . Each leg piece  26  can swing around a base thereof at a side of the flange  20  as a fulcrum, and is made gradually thin to easily insert an end portion  26   a  into attachment holes  4   a ,  4   b . An inner side of each leg piece  26  has a largest diameter at a slightly lower portion of the insertion hole  23 , a smallest diameter at a slightly lower side from a middle between upper and lower portions of the leg piece, and a slightly larger diameter, at a slightly lower side thereof, than the smallest diameter. Also, an inner face of each leg piece is formed with an inclined face  26   b  from the largest diameter portion to the smallest inner diameter portion, the smallest inner diameter portion is formed to be a pressure projection  26   c  pressure contacting the periphery of the shaft portion  13 , and the lower side lower than the pressure projection  26   c  is formed in a vertical face. Incidentally, the engaging portion  24  is located at the upper end of the slit  27 . 
     (Operation) Herein below, the main operation of the clip  3  is explained with reference to  FIGS. 9( a ) to 9( c ) and 10( a ) to 10( c ) . 
     (1) In the clip  3 , in case the pin  1  and the grommet  2  are single products, it is difficult to handle. Therefore, the clip is generally handled or supplied to a using place in a temporary fixing condition where the pin  1  is pre-assembled with the grommet  2 , as shown in  FIG. 2( b )  and  FIG. 9( a ) . In a temporary fixing operation, for example, as shown in  FIG. 1 , the pin  1  is pushed down to the insertion hole  23  of the grommet  2  in a condition to match with the upper inclined faces of the projections which are the engaging portions for the respective wings  14 . Then, the respective wings  14  enter the slit  27  of the leg portion while elastically deforming the engaging portions  24 , and the shaft portion  13  enters the inner side of the respective leg pieces  26 . Then, after the engaging portions  24  ride over from the step portions  17  to the shaft periphery, the engaging portions  24  engage the recess portions which are the first engaged portions  16  or the linear groove portions  15   a  of  FIG. 5 ( d )  with a click feeling, to thereby become the temporary fixing condition. 
     (2)  FIGS. 9( a ) to 9( c )  show operations from the temporary fixing condition to the permanent fixing condition. In this structure, the pin  1  is in the temporary fixing condition, and the shaft portion  13  is further pushed into the leg portion  25 . At that time, it is inserted along the guiding operation of the linear groove portions  15   a  of the guide grooves fitting the engaging portions  24 , so that the engaging portions  24  are elastically engage-released from the depressions as the first engaged portions  16 . Thereafter, the pin  1  is pushed linearly in the condition that the engaging portions  24  are fitted in the linear groove portions  15   a , and after the projections  18  abut against the engaging portions  24 , as shown in  FIG. 9( b ) , when the pin  1  is further pushed, the engaging portions  24  ride over the projections  18  with the elastic deformation and engage the second engaged portions  19  to change to the permanent fixing condition. 
     (3)  FIGS. 10( a ) to 10( c )  show the operations from the permanent fixing condition as shown in  FIG. 9( c )  to again the temporary fixing condition. In the clip  3 , the pin  1  includes the guide grooves  15  on the shaft portion  13  which can guide the linear movement and rotation of the pin in the condition such that the guide grooves  15  engage the engaging portions  24  at the grommet side. Therefore, when the pin  1  is rotated in the counter-clockwise direction for a predetermined angle by using a tool  6 , such as a driver, engaging with an insertion portion  11 , after engagement release as shown in  FIG. 10( a )  where the second engaged portions  19  moves relative to the engaging portions  24  in the peripheral direction, the pin moves for a predetermined length to the upper direction by the guiding operation of the guide grooves  15  relative to the engaging portions  24 , as shown in  FIG. 10( b ) . At this time, in this embodiment, the upper movement of the pin  1  works by the cam operation of the cam projections  12 ,  22 . Thereafter, as shown in  FIG. 10( c ) , when the head  10  of the pin is pulled by a tool or figure, not shown, along with the guide operation of the linear grooves  15   a  of the guide grooves fixing with the engaging portions  24 , the pin  1  moves straight upward to thereby engage the engaging portions  24  with the first engaged portions  16  to return to the temporary fixing condition. Namely, the clip is returned to the initial temporary fixing condition, so that it is efficiently removed by itself or together with the side plate at the attachment side. 
     (4) In other words, in case the permanent fixing condition is changed to the temporary fixing condition, only by rotating operation of the pin  1  for the predetermined angle, after the second engaged portion  19  is engage-released from the engaging portion  24 , the pin is automatically moved up for the predetermined distance along with the guiding operation of the guide groove  15  and the cam operation. Thus, in this structure, even in a narrow place or place where eye-observation is difficult, it is possible to quickly and surely change from the permanent fixing condition to the temporary fixing condition. By the way, as the clip  3  approaches from the permanent fixing condition to the temporary fixing condition, the leg portion  25  is made small to the original condition, so that the clip is likely to rotate relative to the attaching holes  4   a ,  4   b . However, in the clip  3 , by only rotating the pin  1  for the predetermined angle (in the example 90 degrees), the pin  1  is pulled up for the predetermined distance to be able to grab the head portion  10  above the flange  20  and projected due to the cam operation of the guide groove  15  and the above cam operation, so that the above undesirable condition is eliminated. 
     (5) Also, in the above clip  3 , for example, as compared with the clip of the Patent Document 1, the engaging portion  25  of the grommet side engaging with and disengaging from the engaged portions  16 ,  19  of the pin  1  is not formed on the leg portion, as in the Patent Document 1, and is formed near the inner periphery of the insertion hole  23  of the flange portion  20 . Thus, since the enlarged amount of the leg portion  25 , i.e. enlarged diameter of the leg pieces  26  is made large when the pin  1  is inserted all the way to the end, the tolerance relative to the plate thicknesses of the plates  4 ,  5  and the hole diameters of the attachment holes  4   a ,  5   a  is large and is excellent for versatility. 
     As explained above, the clip of the invention is sufficient to include the structure specified in the claims, and the detailed structure may be changed and developed with reference to the embodiments. As an example, the leg portion shows an example having four divided leg pieces, but it may have a structure more than two leg pieces. Similarly, the engaging portions and the engaged portions are four pairs, but two or three pairs may have no problem. Also, depending on the clip, a structure with four engaged portions and two engaging portions may be preferable. The cam projection is to move the pin upwardly by the mutual cam operation by the rotation of the pin relative to the grommet, but it may be omitted. In that case, when the pin of the invention is rotated, after the second engaged portion is engage-released from the engaging portion, the pin readily moves upward, as explained before, along with the guiding operation of the projections and the curved groove portions. 
     EXPLANATION OF NUMERALS 
     
         
           1 : Pin 
           2 : Grommet 
           3 : Clip 
           4 : Main body side plate portion ( 4   a : attachment hole) 
           5 : Attachment side plate portion ( 5   a : attachment hole) 
           6 : Tool, such as a driver 
           10 : Head portion ( 11 : insertion groove) 
           13 : Shaft portion ( 13   b : inclined portion at an end side) 
           15  Guide groove ( 15   a : linear groove portion,  15   b : curved groove portion) 
           16 : First engaged portion 
           17 : Step portion 
           18 : Projection 
           19 : Second engaged portion 
           20 : Flange 
           25 : Leg portion ( 26 : leg piece,  27 : slit) 
           26   c : Pressure projection 
       
    
     The entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2018-155270 filed on Aug. 22, 2018 are cited herein and are incorporated as the disclosure of the specification of the invention.