JP4451341B2 - clip - Google Patents

Description

  The present invention relates to a synthetic resin clip for fixing a mounting part such as a cover member of an automobile to a vehicle body panel side.

  An example of a conventional clip of this type includes a head that holds the cover member and a leg that is engaged with a mounting hole of the vehicle body panel. In particular, the latter leg hangs from the lower surface of the head. Engagement piece which has a support | pillar and extends to the support | pillar in the radial direction on the support | pillar at equal intervals, and is extended in the circumferential direction at the protrusion of each skeleton piece, and is arrange | positioned between each skeleton piece. Are individually extended (see, for example, Patent Document 1).

  Therefore, when the cover member is actually fixed to the vehicle body panel, a state in which the cover member is held by the head portion of the clip is obtained, and the leg portion of the clip is installed in the mounting hole that is previously drilled in the vehicle body panel. Since each engagement piece extending in the circumferential direction bends inward and passes through the hole edge of the attachment hole and each engagement piece elastically engages with the hole edge of the attachment hole from the back side. Thereby, a cover member will be fixed to the vehicle body panel side by one touch.

  As another example, this also includes a head portion that holds the cover member and a leg portion that engages with the mounting hole of the vehicle body panel. In particular, the latter leg portion hangs from the lower surface of the head portion. It has the structure which has the support | pillar which shows cross-sectional cross-section, and interposes the engagement piece which exhibits circular arc shape between each cross-shaped protrusion of this support | pillar (for example, refer patent document 2).

Therefore, even when the cover member is actually fixed to the vehicle body panel even under this clip, the state where the cover member is held by the head of the clip is obtained, and the leg portion of the clip is attached to the vehicle body panel. When inserted into the hole, the engaging piece interposed between the projecting pieces bends inward, passes through the hole edge of the mounting hole, and each engaging piece elastically engages with the hole edge of the mounting hole from the back side. Therefore, similarly, the cover member is fixed to the vehicle body panel side by one touch.
Utility Model Registration No. 2571374 Japanese Patent No. 3450342

  In the clip of the above-mentioned Patent Document 1, in the case where four skeleton pieces are extended and extended in the radial direction with respect to the support column, and the leg portion of the clip is inserted obliquely into the mounting hole, Each frame piece can be prevented from abutting against the inner peripheral surface of the mounting hole to cause buckling, but the engagement piece extending from the projecting end of the frame piece has a free end on the tip edge side. Therefore, if it is inserted obliquely and a large load is applied locally, a specific engagement piece will bend strongly and cause plastic deformation such as sag, and the engagement force on the mounting hole of the body panel will be reduced. There was a fear.

  Further, even in the clip of the above-mentioned Patent Document 2, in the case where the leg portion of the clip is inserted into the mounting hole obliquely because of the cross-shaped cross section having the projecting piece extending radially, It is possible to prevent the projecting pieces from coming into contact with the inner peripheral surface of the mounting hole and cause buckling.However, since the engaging pieces are provided individually with a gap between the projecting pieces, When a large load is locally applied to the engaging piece after being inserted, there is a risk that the connecting portion between the projecting piece and the engaging piece is easily damaged.

The present invention was developed in order to effectively solve the problems of the conventional clip, and the invention according to claim 1 is directed to a head portion for holding a mounting part and a leg portion to be engaged with a mounting hole of the panel. The leg portion includes a support column hanging from the lower surface of the head, at least three projecting pieces extending radially from the support column, and extending from the projecting end of each projecting piece in the circumferential direction. Engaging pieces arranged between the pieces, each engaging piece having an upper edge connected to the lower surface of the head and a lower end connected to the opposing protruding piece, and a circumferential direction of an intermediate portion thereof While the slits are provided between the projecting pieces facing the projecting ends, the axially extending fibers from the portions of the engaging pieces engaged with the hole edges of the mounting holes are shifted from the lower end to the upper end. A first region having a taper angle from smaller to larger than the inner diameter of the mounting hole toward the first region, and the first region continuing from the first region Together and a second region forming a small taper angle than the taper angle, an outer circumferential surface that engages a hole edge of the mounting hole of each engagement piece, it has a larger outer diameter than the mounting hole of the panel mounting Shoulder portions that are engaged from the back side are formed at the hole edges of the holes, and the outer peripheral surface of each shoulder portion has a maximum diameter at the extended end portion of the engaging piece that faces the protruding piece with a slit interposed therebetween. The intermediate piece in the circumferential direction of the engaging piece is formed with the same radius from the extended end.
According to a second aspect of the present invention, on the premise of the first aspect, each engaging piece is extended from a protruding end of the protruding piece at a position slightly contracted in a small diameter direction.

  Therefore, according to the present invention, the leg portion of the clip is inserted into the mounting hole of the panel from an oblique direction, or the clip has a twisting force because it has at least three projecting pieces extending radially from the support column in the radial direction. Even if it acts, since the eccentricity of the leg portion is regulated within the predetermined range by the at least three projecting pieces, it is possible to effectively prevent the engaging pieces from being bent and damaged or damaged.

  In addition, the engaging piece arranged between the projecting pieces is connected to the head side at the upper end edge and connected to the projecting piece side facing the lower end portion, and is not a complete free end. Even if it is strongly pressed on the inner peripheral surface of the mounting hole, it can be prevented from being damaged or damaged.

  Further, the axially extending fiber from the portion engaging with the hole edge of the mounting hole of the engagement piece has a first region having a taper angle from the lower end to the upper end from the inner diameter of the mounting hole to the larger. Since the second region has a taper angle smaller than the taper angle of the first region following the first region, the insertion force of the leg portion with respect to the mounting hole can be effectively reduced.

  In addition to this, since the diameter is gradually increased so that the extended end side facing the protruding piece of the engaging piece becomes the maximum diameter, the hole edge of the mounting hole is firmly engaged with a wide width, For example, even when a twisting force is applied to the clip, the clip will not accidentally come off from the mounting hole.

  The present invention relates to a clip comprising a head for holding a mounting component and a leg portion engaged with a mounting hole of a panel, wherein the leg portion is a strut hanging from the lower surface of the head, and radially from the strut. And at least three projecting pieces that extend from the projecting ends of the projecting pieces in the circumferential direction and are arranged between the projecting pieces. The above-mentioned attachment of each engaging piece is provided while providing a slit between the projecting piece connected to the lower surface and connected to the projecting piece whose lower end part is opposed to and extending in the circumferential direction of the intermediate part. The axial maintenance from the portion engaging the hole edge of the hole continues from the first region to the first region having a taper angle from the lower end to the upper end from the inner diameter of the mounting hole to the larger, and from the first region. And a second region having a taper angle smaller than the taper angle of the first region, and a hole edge of the mounting hole of each engagement piece The outer peripheral surface to be engaged has a diameter that gradually increases so that it becomes the maximum diameter at the opposing position of the opposing projecting piece with a slit interposed, and extends from the intermediate position to the extending end with the same radius. It is characterized by.

  Hereinafter, the present invention will be described in detail with reference to a preferred embodiment shown in the drawings. A clip according to the embodiment has been developed to fix a cover member as a mounting part of an automobile to a vehicle body panel. As shown in FIG. 2, the synthetic resin is an integrally molded product, and includes a head portion 1 that holds a cover member and a leg portion 2 that is engaged with a mounting hole of a vehicle body panel.

  The former head 1 includes a first and second flanges 4 and 5 arranged in a vertical direction with a certain interval through a neck portion 3 and a seal extending in an umbrella shape from the lower surface of the second flange 5. The cover 6 can be held by the head 1 by holding a mounting seat formed on the back surface of the cover member with the first flange 4 and the second flange 5.

  Further, as shown in FIGS. 3 to 5, the latter leg 2 includes three columns 7 that hang from the lower surface of the seal flange 6 of the head 1, and three pieces that extend radially from the column 7 at equal intervals. The projecting pieces 8a, 8b, and 8c and three engaging pieces 9a, 9b, and 9c that extend in the circumferential direction from the projecting ends of the projecting pieces 8a, 8b, and are disposed between the projecting pieces 8a, 8b, and 8c. It has a configuration to provide.

  The three projecting pieces 8a, 8b, and 8c also extend along the axial direction of the support column 7, and the upper end edges thereof are connected to the lower surface of the seal flange 6. The lower end portions of the projecting pieces 8a, 8b, and 8c are connected to the engaging pieces 9a, 9b, and 9c. Also, it protrudes downward and has a tapered shape that decreases in diameter as it goes downward, and is joined to and connected to the lower end of the column 7.

  Each of the engaging pieces 9a, 9b, 9c extending from the protruding ends of the protruding pieces 8a, 8b has two engaging pieces 9a, 9b extending in opposite directions from both side edges of the protruding piece 8a. One engaging piece 9c is extended from the side edge of the protruding piece 8b toward the remaining protruding piece 8c where the engaging piece is not extended, and any of the engaging pieces 9a, 9b, 9c The upper end edge is connected to the lower surface of the seal flange 6 and the lower end edge is connected to the side edges of the opposing projecting pieces 8b and 8c.

  A slit 10a is provided between the extending end portion of the engaging piece 9a in the vertical direction and the protruding piece 8c opposed thereto, and the protruding end portion of the engaging piece 9b is opposed to the protruding end portion. Another slit 10b is provided between the pieces 8b, and another slit 10c is also provided between the extended end portion of the engaging piece 9c and the protruding piece 8c opposed thereto. Accordingly, the slits 10a, 10b, and 10c are projecting pieces 8b, 8c that are opposed to the extending ends of the engaging pieces 9a, 9b, and 9c at the intermediate portions in the vertical direction of the engaging pieces 9a, 9b, and 9c. Therefore, it is ensured that each engagement piece 9a, 9b, 9c bends inward using the space 11 defined on the back side thereof.

  In addition, the upper edge side connected to the lower surface of the seal flange 6 of each engagement piece 9a, 9b, 9c has an outer diameter smaller than the inner diameter of the mounting hole of the vehicle body panel. A shoulder portion 12 having an outer diameter larger than the inner diameter of the mounting hole is formed, and the fibers along the axial direction downward from the shoulder portion 12 are smaller than and larger than the inner diameter of the mounting hole from the lower end toward the upper end. And a second region 14 that has a taper angle θ2 that is smaller than the taper angle θ1 of the first region 13 and continues from the first region 13 (tapered). See Figure 8 for corners).

  In addition to this, the outer peripheral surface of the shoulder 12 of each of the engagement pieces 9a, 9b, 9c is, as shown in FIG. 3, particularly the protrusions 8b, 8c facing each other through the slits 10a, 10b, 10c. The diameter is gradually increased so as to become the maximum diameter at the facing position, and the structure extends from the intermediate position to the extended end with the same radius. Each of the engaging pieces 9a, 9b, 9c is extended from the protruding end at a position slightly contracted in the small diameter direction with respect to the protruding pieces 8a, 8b. From the rear side to the extended end portion, the hole edge of the mounting hole of the vehicle body panel is engaged with a wide width.

  Therefore, when the cover member 21 is fixed to the vehicle body panel P using the clip having such a configuration, first, the first flange is inserted into the fitting hole 23 formed in the mounting seat 22 of the cover member 21. 4 and the second flange 5 are fitted together, and the edge of the fitting hole 23 is held by the first flange 4 and the second flange 5 from above and below. The cover member 21 can be held.

  Therefore, after obtaining this holding state, when the leg portion 2 of the clip is inserted into the mounting hole H previously drilled in the vehicle body panel P, the above-mentioned projecting pieces 8a, 8b and 8c are tapered to reduce their diameters. While the lower end of the shape guides the insertion into the mounting hole H, the first region 13 of each engagement piece 9a, 9b, 9c is then inserted into the mounting hole H. When one region 13 is inserted deeply into the mounting hole H, the intermediate portions of the engagement pieces 9a, 9b, 9c pass smoothly through the slits 10a, 10b, 10c and the space 11 while gradually bending inward. This time, the second region 14 that follows this is inserted into the mounting hole H.

  However, the second region 14 is not parallel to the axis of the leg 2 as in the prior art, and has a taper angle θ2 smaller than the taper angle θ1 of the first region 13. Since each of the engagement pieces 9a, 9b, 9c is inserted while being bent inward and passes through the attachment hole H, the insertion force is effectively reduced as will be described later.

  Therefore, finally, the engagement pieces 9a, 9b, and 9c bent inwardly return to the original shape, and the shoulder 12 is elastically formed from the back side to the hole edge of the mounting hole H as shown in FIG. Thus, as shown in FIG. 7, the cover member 21 is fixed to the vehicle body panel P side by one touch.

  In addition, in this fixed state, as described above, the diameter is gradually increased so that the extended end side of each engaging piece 9a, 9b, 9c facing the protruding piece 8b, 8c has the maximum diameter. Because of this, it is possible to firmly engage with the hole edge of the mounting hole H with a wide width, so that even if a twisting force is applied to the clip, the clip is inadvertently detached from the mounting hole H. There is nothing.

  Further, when the clip leg 2 is inserted into the mounting hole H of the vehicle body panel P, the three projecting pieces 8a, 8b, 8c extending radially from the column 7 are arranged at equal intervals. Since the protruding end comes into contact with the inner peripheral surface of the mounting hole H, even if the leg portion 2 is inserted into the mounting hole H from an oblique direction, the leg portion 2 is brought into contact with the inner peripheral surface by contact with the inner peripheral surface. Since it is inserted straight without being eccentric, the load does not concentrate on a specific one of the engagement pieces 9a, 9b, 9c, and the engagement pieces 9a, 9b, 9c may be bent or damaged. It can be effectively prevented.

  In addition, as described above, each of the engagement pieces 9a, 9b, and 9c has an upper end edge connected to the seal flange 6 and a lower end portion connected to the opposite protruding pieces 8b and 8c in an annular shape. As a result of the increased rigidity, it is possible to effectively prevent the engagement pieces 9a, 9b, and 9c from sag and breakage against the above-described twisting force. However, since the intermediate portion is separated from the projecting pieces 8b and 8c through the slits 10a, 10b, and 10c, even if the extended end side is made the maximum diameter, the insertion force may be increased more than necessary. There is no.

  Next, in this embodiment, the reduction in the insertion force of the leg 2 with respect to the mounting hole H will be described in detail, comparing with the conventional one. Since it is determined by the sum of the load F1 required to reduce the diameter according to the taper angle and the frictional resistance force F2 acting on the contact surface between the engagement piece and the mounting hole of the vehicle body panel, F = F1 + F2. The F1 increases as the taper angle increases. F2 is expressed as F2 = Fn × μ by the ratio of the load Fn pressed against each other between the engagement piece and the mounting hole and the friction coefficient μ therebetween. Here, in the state where the part of the engagement piece having the diameter φd is inserted into the mounting hole of the diameter φD of the vehicle body panel, Fn is the tightening allowance (Δ = φd−φD) and the part of the engagement piece. In a state where it is determined by the rigidity S and there is a gap, Fn = 0. In a state where it is pushed in, Δ is larger and S is larger.

  Therefore, when comparing the conventional clip and the clip of the present embodiment based on such a premise, in the conventional clip, as shown in FIG. 8, the engagement piece has a constant taper angle in the range from the tip a to b2. The outer diameter is gradually enlarged at θ1, the range from b2 to c is made equal (parallel to the axis of the leg), and the outer diameter is gradually decreased from c to d by a reverse taper. Connected to the head of the clip.

  When the conventional clip is inserted into the mounting hole of the vehicle body panel in terms of coordinates where the clip is fixed and the cover member moves relatively, the transition of F1 is shown by a chain line in FIG. Furthermore, since the engagement piece does not contact the attachment hole from the tip a to the position b1 having the same diameter as the attachment hole, F1 = 0, but from b1 to b2, the taper angle θ1 of the engagement piece is constant. Therefore, F1 also becomes a constant value F11. Also, from b2 to c, the taper angle of the engaging piece is 0, so that F1 is also a constant value 0. From c to d, since the taper angle of the engagement piece is <0, F1 is also negative. However, since the insertion of the clip into the mounting hole is already completed, it will not be described in detail and also displayed in the graph Not done.

  Next, as shown by the chain line in FIG. 10 and FIGS. 11 to 12, the transition of F2 is the same as the engagement piece does not contact the mounting hole from the tip a to the position b1 having the same diameter as the mounting hole. No frictional resistance is generated and F2 = 0. From b1 to b2, the outer diameter gradually increases due to the taper angle θ1 of the engaging piece, and the difference (tightening margin) Δ from the diameter φD of the mounting hole is from Δ = 0 as shown by the chain line in FIG. Increase gradually. On the other hand, as described above, the engaging piece has a lower end portion connected to the projecting piece, an upper end edge connected to the head portion, and a slit interposed between them. As shown in FIG. 10, the rigidity S is high at both ends and minimum at the center. For this reason, F2 increases as the tightening allowance Δ increases and the rigidity S increases, and therefore rises along a gentle curve as shown in FIG. In addition, from b2 to c, the tightening allowance Δ does not change, but the rigidity S exceeds the minimum value and starts to increase, so that F2 increases slowly under the influence.

  Therefore, when F is illustrated by F1 and F2 described above, as shown by the chain line in FIG. 13, the insertion force F becomes maximum at the point b2, and then F1 decreases to 0 because F1 becomes 0. However, it is clear that the insertion force F takes the maximum value at the point b2.

  Through the above examination and consideration, by replacing the b3 point to the c point with a gentle taper angle θ2 smaller than the taper angle θ1, both F1 and F2 at the b2 point are lowered, and the maximum value of the insertion force F is increased. I thought it could be reduced.

  The transition of F1 is the same as that of the conventional clip from the tip a to the position b1 having the same diameter as the mounting hole as shown by the solid line in FIG. To b3 are the same as the conventional clip. However, from b3 to c, the taper angle of the engagement piece is switched to a gentle value θ2 and is kept constant, and thus becomes a constant value F12 smaller than F11. Although F1 does not become “zero” as in the conventional clip, the insertion force F in c can be reduced as a result of being suppressed to a value that has been reduced from the previous stage of b2. Note that c to d are the same as those of the conventional clip.

  Next, as shown by solid lines in FIGS. 10 and 11 to 12, the transition of F2 is the same as that of the conventional clip from the tip a to the position b1 having the same diameter as the mounting hole, and b1 to b3. This is the same as the conventional clip. However, from b3 to c, the outer diameter of the engagement piece is smaller than the conventional one due to the effect of changing the taper angle θ2 to be smaller than the taper angle θ1, and the tightening allowance Δ is also the conventional one. Smaller than that. Therefore. As a result, the rigidity S is substantially the same as the conventional one, but as a result, F2 is smaller than that of the conventional clip.

  Therefore, when F is illustrated by F1 and F2 described above, as shown by the solid line in FIG. 13, since both F1 and F2 can be reduced from b3 to b2, the insertion force F itself is also smaller than the conventional one. In particular, it is possible to make it sufficiently small at the point b2 which has been the maximum value of the insertion force F in the prior art.

  In addition, when the actual measurement value is shown in FIG. 14, this actual measurement graph shows a tendency very similar to FIG. 13 showing the above-described analysis examination situation, and the conventional one shows b2 points as shown by the chain line. After the maximum insertion force was generated in Fig. 1, the value decreased sharply, but in the example, as shown by the solid line, it decreased once at the point b3 before the point b2, and then the decrease was suppressed and was lower than before. Although a high value will be shown, if it is judged by the maximum value, it will be a reduced value compared to the conventional case.

  In particular, the clip according to the present invention can reduce the insertion force of the leg portion into the mounting hole and can increase the engagement force of the leg portion with the hole of the mounting hole. In the case of fixing to the panel side, it is convenient.

It is a perspective view which shows the clip concerning the Example of this invention. It is a longitudinal cross-sectional view of the same clip. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line of FIG. It is principal part sectional drawing which shows the state which each engagement piece engaged with the hole edge of the attachment hole of the vehicle body panel. It is principal part sectional drawing which shows the state which fixed the cover member to the vehicle body panel. It is explanatory drawing which shows the shape of the clip which concerns on an Example, and the conventional clip. It is a diagram which shows the load required in order for an engagement piece to reduce a diameter according to a taper angle. It is a diagram which shows the rigidity of an engagement piece. It is a diagram which shows the interference of the engagement piece. It is a diagram which shows the frictional resistance force which acts on the contact surface of an engagement piece and an attachment hole. It is a diagram which shows the insertion force with respect to the attachment hole of a leg part. It is a diagram which shows a measured value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head 2 Leg 3 Neck 4 1st flange 5 2nd flange 6 Seal flange 7 Post 8a Projection piece 8b Projection piece 8c Projection piece 9a Engagement piece 9b Engagement piece 9c Engagement piece 10a Slit 10b Slit 10c Slit 11 Empty Location 12 Shoulder 13 First area 14 Second area 21 Cover member (mounting part)
22 Mounting seat 23 Fitting hole P Body panel (panel)
H Mounting hole

Claims (2)

In a clip comprising a head portion for holding a mounting part and a leg portion that engages with a mounting hole of the panel, the leg portion includes at least three pillars extending from the bottom surface of the head and radially extending from the pillar. Each projecting piece and an engaging piece that extends in the circumferential direction from the projecting end of each projecting piece and is disposed between the projecting pieces, each engaging piece having an upper end edge connected to the lower surface of the head. The slits are provided between the projecting pieces whose lower end portions are connected to the opposing projecting pieces and the extending end portions in the circumferential direction of the intermediate parts are opposed to each other. In the axial direction from the portion engaged with the first region, the first region has a taper angle from the lower end to the upper end and is smaller than the inner diameter of the mounting hole, and the first region continues from the first region. And a second region having a taper angle smaller than the taper angle, and engages with the edge of the mounting hole of each engagement piece The peripheral surface, a shoulder that engages the back side hole edge of the mounting hole has a larger outer diameter than the mounting hole of the panel is formed, the outer peripheral surface of each of the shoulder portion, with intervening slit A clip characterized by being formed with the same radius from the intermediate position in the circumferential direction of the engaging piece to the extending end so that the maximum diameter is obtained at the extending end of the engaging piece facing the protruding piece. . The clip according to claim 1, wherein each engaging piece is extended at a position slightly contracted in a small diameter direction from a protruding end of the protruding piece.

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