JP2005067029A - Clip fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the possibility that a fitting part of a clip disengages from an expanded part of a tube body when the clip is raised, and to broaden the degree of freedom on the design of the frontal shape of the clip. <P>SOLUTION: The expanded part 3 which has a cross section shaped substantially like a letter T and projects outward in the radial direction is provided outside the tube body 2. A pair of engagement grooves 31 extending in the longitudinal direction is formed outside the opposite lateral walls of the expanded part 3. A pair of projections 32 is provided in the portion above the engagement grooves 31 outside the opposite lateral walls of the expanded part 3. On the other hand, the base part of the clip 4 is provided with the fitting part 5 having a cross section shaped substantially like a letter C. A pair of projecting parts 51 for engagement is formed inside the opposite lateral walls of the fitting part 5. A pair of engagement holes 52 is provided in the portion above the projecting parts 51 for engagement inside the opposite lateral walls of the fitting part 5. On the occasion when the fitting part 5 is fitted externally on the expanded part 3 of the tube body 2, the projecting parts 51 for engagement is engaged with the engagement grooves 31, while the projections 32 is engaged with the engagement holes 52. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a clip mounting structure. Specifically, the present invention relates to a clip mounting structure of a type in which a mounting portion provided at a base portion of a clip is externally fitted to a bulging portion provided on an outer surface of a cylindrical body of a writing instrument (for example, a shaft cylinder or a cap of a writing instrument). In the present invention, “front” refers to the free end side of the clip, and “rear” refers to the base side of the clip. In the present invention, the “left-right direction” refers to the left-right direction with respect to the clip symmetry axis when the clip is viewed from the front in the vertical direction. In the present invention, “upper” means the surface side of the clip and the protruding end side in the radial direction of the bulging portion, and “lower” means the opposite side.

  Conventionally, in this type of clip mounting structure, Patent Document 1 states that “a clip of a writing instrument formed by engaging a base portion of a rear end of a clip projecting on an outer surface of a resin shaft and provided on a clip. In the fixing structure, the clip is provided with a pair of opposing engaging projections on the inner side of the base side portion, and a cut portion is formed in the upper portion of the base portion toward the front of the clip. The mounting portion has a substantially T-shaped cross section, an engagement groove is formed on the side, and a protrusion is provided on the upper portion. The engagement protrusion of the clip is engaged with the engagement groove of the shaft body. "A clip fixing structure for a writing instrument in which the projecting portion is fitted to the cut portion in the combined state."

  Further, Patent Document 1 states that “a step portion is formed in front of the clip engaging protrusion in the axial direction, and a step portion is formed in front of the axial end of the shaft body engaging groove in the axial direction. The front part of the clip is provided to be inclined toward the axial center, and the step of the clip engagement protrusion is the shaft body engagement groove in a state where the engagement protrusion of the clip is engaged with the engagement groove of the shaft body. It is disclosed that it is provided so as to be engaged with a step portion of the

  However, in the clip mounting structure of Patent Document 1, when the clip is lifted, the engagement protrusion is opened in the left-right direction and the engagement between the step of the engagement groove and the step of the engagement protrusion is released. As a result, the engagement protrusion of the clip may be disengaged from the engagement groove of the shaft body.

Moreover, since the notch part is provided in the upper part of the base of a clip, the clip attachment structure of the said patent document 1 receives the restrictions on the design of a clip front shape.
Japanese Patent Laid-Open No. 2002-287991

  The present invention solves the above-mentioned conventional problems, and when the clip is lifted, the clip has a sufficient mounting strength so that the mounting portion of the clip does not come off from the bulging portion of the cylinder, and the clip It is an object of the present invention to provide a clip mounting structure that increases the degree of freedom in design of the front shape.

[1] In the present invention, a bulging portion 3 projecting radially outward is provided on the outer surface of the cylindrical body 2, and a pair of engaging grooves 31 extending in the front-rear direction are formed on the outer surfaces of both side walls of the bulging portion 3. The bulging portion 3 has a substantially T-shaped cross section, and on the other hand, a mounting portion 5 is provided at the base of the clip 4, and a pair of engaging protrusions 51 are formed on the inner surfaces of both side walls of the mounting portion 5. Clip mounting in which the mounting portion 5 has a substantially C-shaped cross section, and the engaging protrusion 51 is engaged with the engaging groove 31 when the mounting portion 5 is externally fitted to the bulging portion 3. In the structure 1, a pair of convex portions 32 are provided in the upper portion of the engaging groove 31 on the outer surface of the both side walls of the bulging portion 3, while the upper portion of the engaging protrusion 51 on the inner surface of the both side walls of the mounting portion 5 is provided. A pair of engagement holes 52 are provided in the portion, and when the mounting portion 5 is externally fitted to the bulging portion 3, the convex portion 32 is engaged with the engagement hole 52 (Claim 1). The matter.

  A pair of convex portions 32 are provided in the upper portion of the engaging groove 31 on the outer surface of the both side walls of the bulging portion 3 of the first aspect, while the upper portion of the engaging protrusion 51 on the inner surface of the both side walls of the mounting portion 5 is provided. When the clip 4 is lifted by providing a pair of engagement holes 52 and fitting the mounting portion 5 to the bulging portion 3 and engaging the convex portion 32 with the engagement hole 52. Even if the engagement protrusion 51 expands in the left-right direction, the portion having the engagement hole 52 on the inner surface of the both side walls of the mounting portion 5 does not expand in the left-right direction. The combined state is maintained. As a result, the attachment portion 5 of the clip 4 is not likely to come off from the bulging portion 3 of the cylindrical body 2, and sufficient attachment strength of the clip 4 is obtained. Further, the clip 4 is not provided with a notch or the like, and the degree of freedom in designing the front shape of the clip 4 is increased.

[2] In the clip mounting structure 1 of the first aspect, it is preferable that the engagement holes 52 are opened from the outer surfaces of both side walls of the mounting portion 5 (Claim 2). Thereby, the depth dimension of the engagement hole 52 can be set deeply, and the strong engagement with the convex part 32 becomes possible further. In particular, when the clip 4 is formed of a synthetic resin injection-molded body, if the engagement holes 52 on the inner surfaces of the both side walls of the mounting portion 5 are not opened from the outer surfaces of the both side walls, the portions of the engagement holes 52 are undercut. Therefore, it is difficult to obtain the engagement hole 52 having a sufficient depth. However, since the engagement hole 52 is opened from the outer surface of the both side walls of the mounting portion 5 according to claim 2, the engagement hole 52 of the outer surface of the both side walls of the mounting portion 5 is divided by the split mold divided in the left-right direction. By forming, the engagement hole 52 having a sufficient depth can be easily obtained.

[3] In the clip mounting structure 1 according to claim 1 or 2, the front portion of the engagement hole 52 on the inner surface of the both side walls of the mounting portion 5 is engaged with the convex portion 32 and the convex portion 32 is engaged. It is preferable to provide a guide groove 53 for guiding the hole 52 (claim 3). As a result, when the mounting portion 5 of the clip 4 is externally fitted to the bulging portion 3 of the cylindrical body 2, the convex portion 32 is smoothly caught in the guide groove 53 without being caught on both side walls of the mounting portion 5. Therefore, the attachment portion 5 can be smoothly inserted into the bulging portion 3, and the convex portion 32 can be reliably engaged with the engagement hole 52.

  According to the first aspect, when the clip is lifted, the attachment portion of the clip has a sufficient attachment strength so that the attachment portion of the clip does not come off from the bulging portion of the cylindrical body, and the degree of freedom in design of the clip front surface is increased.

  According to the second aspect of the present invention, the depth dimension of the engagement hole can be set deeper, and the engagement with the convex portion can be further enhanced.

  According to the third aspect, the attachment portion can be smoothly inserted into the bulging portion, and the convex portion can be reliably engaged with the engagement hole.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 to 5 show an embodiment of the clip mounting structure 1 of the present invention.

  The cylinder 2 is made of an injection-molded body of a synthetic resin (for example, polycarbonate, polyethylene terephthalate, polypropylene, etc.). A bulging portion 3 is integrally formed on the outer peripheral surface of the rear end portion of the cylindrical body 2. A pair of engaging grooves 31 extending in the front-rear direction are formed on the outer surfaces of both side walls of the bulging portion 3. Further, a pair of columnar convex portions 32 projecting in the left-right direction are integrally formed on the outer surfaces of both side walls of the bulging portion 3 in the upper portion from the engagement groove 31. The bulging portion 3 has a substantially T-shape in a cross section including the engaging groove 31 and the convex portion 32. Furthermore, an inclined surface 32a is formed at the rear portion of each of the convex portions 32 so that the protruding amount decreases as it goes rearward. Thereby, it becomes smooth to insert the convex portion 32 into the guide groove 53.

  The clip 4 is made of an injection molded body of synthetic resin (for example, polycarbonate, polyethylene terephthalate, polypropylene, etc.). A mounting portion 5 having a substantially C-shaped cross section with the lower portion opened and the upper portion closed is formed integrally with the base portion of the clip 4. A pair of engaging protrusions 51 extending in the front-rear direction are integrally formed on the inner surfaces of both side walls of the mounting portion 5. Further, a pair of circular engagement holes 52 are provided in the left and right direction on both side walls of the attachment portion 5 at the upper part from the engagement protrusion 51.

  A wall portion 54 that connects the inner surfaces of both side walls is integrally formed at the rear end of the attachment portion 5, and the rear end of the attachment portion 5 is closed by the wall portion 54. The wall portion 54 can suppress the spread of both side walls of the attachment portion 5, and can further prevent the attachment portion 5 of the clip 4 from coming off from the bulging portion 3 of the cylindrical body 2. The front end of the attachment portion 5 is opened, and the bulging portion 3 is inserted from the front end opening portion of the attachment portion 5. Further, the depth of the guide groove 53 is set so that the outer surface of the convex portion 32 is in pressure contact and both side walls of the mounting portion 5 are pushed to the left and right.

  A pair of guide grooves 53 extending in the front-rear direction are formed in front of the engagement holes 52 on the inner surfaces of the both side walls. The guide groove 53 has a front end opened forward and a rear end communicating with the engagement hole 52. The guide groove 53 is set to have a width that is slightly larger than the outer diameter of the convex portion 32 so that the convex portion 32 can be inserted and slid.

  When the clip 4 is attached to the cylinder 2, when the front end of the attachment portion 5 of the clip 4 is inserted forward from the rear end of the bulging portion 3 of the cylinder 2, first, the engagement protrusion 51 is engaged. Inserted into the groove 31, the engaging protrusion 51 moves forward in the engaging groove 31, and at the same time, the convex part 32 is inserted into the guide groove 53, and the convex part 32 spreads both side walls left and right while guiding the guide groove. Move backward in 53. Then, the convex part 32 is engaged with the engagement hole 52, and the attachment of the clip 4 is completed.

  When the clip 4 is lifted by disposing the protrusion 32 above the engagement groove 31 and disposing the engagement hole 52 with which the protrusion 32 is engaged above the engagement protrusion 51, Even if the protrusion 51 extends in the left-right direction, the side walls of the engaging hole 52 are not so wide in the left-right direction, so that the convex portion 32 is not likely to come off the engaging hole 52. Therefore, there is no possibility that the attachment portion 5 of the clip 4 is detached from the bulging portion 3 of the cylindrical body 2.

  Furthermore, the depth dimension of the engagement hole 52 can be set deeply by penetrating the engagement hole 52 in the left-right direction (that is, the engagement hole 52 is opened from the outer surface of both side walls of the mounting portion 5). Further, the engagement between the engagement hole 52 and the convex portion 32 can be further enhanced. Further, the clip 4 is formed of a synthetic resin injection molded body, and the engagement holes 52 on the outer surface of both side walls of the mounting portion 5 are molded by a split mold that is divided in the left-right direction. The engagement hole 52 having a sufficient depth can be easily obtained.

  In this embodiment, the width dimension of the portion of the bulging portion 3 that does not include the convex portions 32 on the outer surfaces of the both side walls is the width dimension of the portion that does not include the engagement holes 52 and the guide grooves 53 on the inner surfaces of both side walls of the mounting portion 5 It is almost coincident. The maximum height h of the convex portion 32 is set to be greater than the depth d of the guide groove 53. Thereby, after the convex part 32 engages with the engagement hole 52, it can prevent reliably that it pulls out in the front-back direction.

  In this embodiment, the convex portion 32 is formed in a columnar shape and the engagement hole 52 is formed in a circular shape, so that the manufacturing becomes relatively easy. However, other than this, the shape of the convex portion 32 may be any of a prismatic shape, a pyramid shape, a spherical shape, and the like, and the shape of the engagement hole 52 is any of a polygonal shape, an elliptical shape, and the like. It may be.

It is a principal part disassembled perspective view which shows the Example of this invention. It is a principal part perspective view which shows the clip attachment state of FIG. It is a longitudinal cross-sectional perspective view of the attaching part of the clip of FIG. FIG. 3 is a front view of FIG. 2. It is the sectional view on the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clip attachment structure 2 Tubular body 3 Enlarged part 31 Engagement groove 32 Projection part 32a Inclined surface 4 Clip 5 Attachment part 51 Engagement protrusion 52 Engagement hole 53 Guide groove 54 Wall part h Maximum height of projection d Guide Groove depth

Claims (3)

A bulging portion protruding radially outward is provided on the outer surface of the cylindrical body, and a pair of engaging grooves extending in the front-rear direction are formed on the outer surface of both side walls of the bulging portion. On the other hand, a mounting portion is provided at the base of the clip, a pair of engaging protrusions are formed on the inner surfaces of both side walls of the mounting portion, the mounting portion has a substantially C-shaped cross section, and the bulging portion A clip mounting structure in which the engaging protrusion is engaged with the engaging groove when the mounting portion is externally fitted to the upper portion of the engaging groove on the outer surface of both side walls of the bulging portion. When a pair of protrusions are provided, and a pair of engagement holes are provided in the upper part of the engagement protrusions on the inner surfaces of both side walls of the attachment part, and the attachment part is externally fitted to the bulging part, the protrusions A clip mounting structure in which a portion is engaged with the engagement hole. The clip mounting structure according to claim 1, wherein the engagement hole is opened from an outer surface of both side walls of the mounting portion. The clip mounting structure according to claim 1 or 2, wherein a guide groove that engages with the convex portion and guides the convex portion to the engaging hole is provided in a front portion of the engaging hole on the inner surface of both side walls of the mounting portion.

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