JP2006062232A - Fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting structure enabling attainment of a fitting force being stable with time. <P>SOLUTION: The fitting structure is a means to fit external and internal members to each other. Engaging parts are formed in the inner surface of the external member, while engaging support parts engaging with the engaging parts are formed in the outer surface of the internal member. The inner shape of the engaging parts is formed to be a little smaller than the outer shape of the engaging support parts, and a run-off part is formed in the rear of the engaging parts or in front of the engaging support parts in this fitting structure of the external and internal members. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fitting means between an outer member and an inner member.

  Japanese Utility Model Laid-Open No. 1-169392 is known as a cylindrical cap on which a rod-shaped object is detachably fitted to a writing shaft body. Specifically, the writing shaft body having the tip tool is accommodated in the outer cylinder with the tip tool protruding, and a step portion and a spiral groove are provided on the inner surface of the front portion and the rear portion of the cylindrical cap, respectively. In addition, the rear inner diameter of the spiral groove is increased, a receiving portion that contacts the core tank of the writing shaft body is provided in the front portion of the cylindrical body, and the cylindrical body is further formed against the inner surface of the rear portion of the outer cylinder. The front portion of the cylindrical body is configured to be movable in the axial direction and locked in the rotational direction, and a slit is provided in the rear portion of the cylindrical body, and a gripping piece of a rod-shaped object holder is slidably fitted into the slit. A rod-like object is held on the holding piece, and a protrusion provided on each holding piece is fitted into the spiral groove of the cylindrical cap.

The front portion of the cylindrical body is detachably fitted to the rear of the core tank, although it is in a press-fitted state. The press-fitting of the cylindrical body and the core tank prevents the outer shaft and the cylindrical cap from being disassembled.
Japanese Utility Model Publication 1-169392

By the way, the inner surface of the cylindrical body and the outer surface of the core tank are always press-fitted (fitted). In other words, since the forces always act on each other, the physical properties of the members constituting the cylindrical body and the core tank change over time, specifically, the mutual elastic force gradually weakens, The input (fitting force) was weakened and it was easy to come out.
As a result, for example, in the case of a product with a grip on the outer cylinder or writing shaft body, if the product is inserted into a pocket and then removed from the pocket, the fitting force is weaker than the frictional resistance between the grip and the pocket (cloth). There has been a problem that only the cylindrical cap (tubular body) comes off.
Further, since the cylindrical body is in a press-fitted (fitted) state, the cylindrical body easily swells in the outer diameter direction, and the swelling (movement in the axial direction) resistance of the cylindrical body with respect to the outer cylinder increases due to the swelling. The operation itself became heavy and the operation was uncomfortable. The bulging phenomenon due to such press-fitting becomes more prominent as the thickness of the cylindrical body becomes thinner.

  The present invention is a fitting means for an outer member and an inner member, wherein an engaging portion is formed on the inner surface of the outer member, and an engaging receiving portion that engages with the engaging portion is formed on the outer surface of the inner member. The inner shape of these engaging portions is formed slightly smaller than the outer shape of the engaging receiving portion, and the relief portion is formed behind the engaging portion or in front of the engaging receiving portion. And

  The present invention is a fitting means for an outer member and an inner member, wherein an engaging portion is formed on the inner surface of the outer member, and an engaging receiving portion that engages with the engaging portion is formed on the outer surface of the inner member. Since the inner shape of the engaging portions is slightly smaller than the outer shape of the engaging receiving portion, and the escape portion is formed behind the engaging portion or in front of the engaging receiving portion. Stable fitting force can be obtained.

One example will be described with reference to FIG. The shaft body 1 includes a front shaft 2, a rear shaft 3, and a tip member 4 that is detachably screwed to the front end of the front shaft 2. Thereafter, a rod-like body (in this example, an eraser) that appears and disappears by a spiral mechanism is disposed inside the shaft 3. Hereinafter, this spiral mechanism will be described. A spiral groove 5 is formed on the inner wall surface of the rear shaft 3, and a rod-shaped body guide member 6 is attached to the rear shaft 3 so as to be able to move back and forth while being rotatable. Slits 7 are formed on both sides of the rod-shaped body guide member 6, and engaging protrusions 10 of the receiving member 9 into which the eraser 8 is press-fitted are fitted. Further, a spiral projection 11 is formed on the engagement projection 10 and is screwed into a spiral groove 5 provided on the inner wall surface of the rear shaft 3.
Further, an extending portion 12 is extended and formed in the front portion of the rod-shaped body guide member 6, and the extending portion 12 is detachably attached to the core tank 13 disposed inside the front shaft 2. Is fitted. Further, the outer peripheral surface of the extending portion 12 has a decagonal shape and is engaged with a decagonal portion formed on the inner surface of the front shaft 2. In other words, the rod-shaped body guide member 6 has the extended portion 12 embedded in the rear portion inside the front shaft 2 and can be moved back and forth with respect to the front shaft 2 but is non-rotatably attached. A slight gap is formed between the inner peripheral surface of the front shaft 2 and the outer peripheral surface of the extending portion 12 so that the extending portion 12 can be easily moved back and forth with respect to the front shaft 2.
In addition, a partition wall 6a is formed at the intermediate portion of the rod-shaped body guide member 6 and at the rear portion of the extending portion 12, and a window hole is formed in front of the partition wall 6a and behind the extending portion 12. (Relief portion of the present invention) 6b is formed at a facing position. And the fitting projection 6c is formed in four places at equal intervals in the front inner surface of the extension part 12 in front of the partition wall 6a, but the opposed window hole 6b has two of them. It is formed on the extension line of the fitting protrusion 6c. That is, two of the four fitting protrusions reach the partition wall, but the remaining two fitting protrusions are formed only by the window portion to the lower end portion of the window portion. . These fitting protrusions 6c correspond to the engaging portions of the present invention. In the present embodiment, the window hole 6b is a through-hole, but may be an arc-shaped groove formed on the inner surface of the rod-shaped body guide member 6. Further, the number of the fitting protrusions and the window holes is not limited to this example, and it is sufficient that there are at least one each. Preferably, the fitting protrusion and the window hole are desirably formed at an appropriate interval. For example, if each is formed one by one, it is preferably formed at a position facing each other.

On the other hand, a tip member 4 is detachably attached to the tip of the front shaft 2 by means such as screwing, and a metal core protection tube 4a is fixed to the tip of the tip member 4. However, these may be integrally formed. A core detent member 14 made of an elastic rubber or the like that holds the core lightly and prevents the core from retreating is press-fitted and fixed to the inner surface of the core protection tube 4a. Alternatively, it may be formed integrally with the tip member 4) and insert molding or two-color molding, and further by electroforming. Thus, by arranging the lead detent member at the tip as much as possible, the remaining core removed from the chuck body can be held until it becomes shorter, so that the remaining core can also be used effectively.
Further, a lead tank 13 capable of accommodating a plurality of cores is disposed inside the front shaft 2 so as to be movable back and forth, and a chuck body 15 for gripping and releasing the core is provided at the tip of the lead tank 13. It is fixed by means such as press fitting. On the other hand, a fitting flange 13 a is formed on the outer peripheral surface of the rear end of the lead tank 13. The outer diameter of the fitting flange 13a is formed larger than the inscribed circle of the fitting protrusion 6c of the rod-shaped body guide member 6, and the fitting flange 13 corresponds to the engagement receiving portion of the present invention. To do. That is, the fitting flange 13a of the lead tank 13 passes over the fitting protrusion 6 of the rod-shaped body guide member 6 in a press-fit state and reaches the window hole 6, and the rear end of the lead tank 13 is the partition wall 6a. The amount of insertion between the rod-shaped body guide member 6 and the core tank 13 is regulated by contacting the front end surface.
In this example, a relief portion is formed by forming a window hole 6a in the middle portion of the rod-shaped body guide member 6, but a circumferential groove portion is formed in front of the fitting flange portion 13a of the core tank 13. Etc., the circumferential groove portion may be used as a relief portion. Of course, it is preferable that the width of the groove is equal to or slightly longer than the length of the fitting protrusion 6 of the rod-shaped body guide member 6.
Reference numeral 16 denotes a chuck ring that opens and closes the chuck body 15, and reference numeral 17 denotes an elastic member made up of a coil spring that biases the chuck body 15 and the core tank 13 backward.

  Next, the operation will be described. When the front shaft 2 and the rear shaft 3 are attached and detached, the fitting collar 13a of the core tank 13 contacts the fitting projection 6c of the rod-shaped body guide member 6, and from this time, the fitting collar 13a faces inward. Although the outer peripheral portion of the fitting projection 6 bulges out, the fitting collar 13 is positioned in the window hole 6b after overcoming the fitting projection 6, and thereby the fitting collar The inward deformation of the portion 13a is released and bulges / restores. At this time, the fitting flange 13a positioned other than the window hole 6b is pressed and deformed by the fitting projection 6c, but the deformation is deformed in the direction of the window 6b. That is, the major axis side is deformed into an elliptical shape located in the window portion 6b. At the same time, the bulging action of the rod-shaped body guide member 6 is also released. As a result, the elliptical fitting flange 13a located in the window 6b abuts and engages with the lower end of the window 6a (see FIG. 10), and the rod-shaped body guide member 6 and the core tank 13 are detached. In addition, in this example, the smooth sliding action of the rear shaft 3 with respect to the front shaft 2 is obtained. Even if the inner member that has been deformed is fitted, the inner member is deformed and crushed in the direction of the fitting protrusion to become elliptical. As a result, the long-diameter side of the ellipse is locked to the window portion to be fitted and prevented from being detached.

  In the above example, the stick-shaped body feeding device in which the eraser, which is a stick-shaped body, is arranged so as to be able to appear and retract is attached to the rear of the mechanical pencil. It may be good. Further, for example, the present invention can be applied to a shaft-to-shaft fitting structure capable of adjusting the length according to the size of the user's hand, or to adjusting the length of a handle such as a broom or a mop. Good.

The longitudinal cross-sectional view which shows one example of this invention. The principal part enlarged view of FIG. The exploded view of FIG. The principal part enlarged view of FIG. The front view of a rod-shaped body guide member. The longitudinal cross-sectional view of FIG. FIG. 6 is a left side sectional view of FIG. 5. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. FIG. 6 is a sectional view taken along line BB in FIG. 5. The CC sectional view taken on the line which shows a fitting state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft body 2 Front shaft 3 Rear shaft 4 Lead member 5 Spiral groove 6 Rod-shaped body guide member 7 Slit 8 Eraser 9 Receiving member 10 Engagement protrusion 11 Spiral protrusion 12 Extension part 13 Core tank 14 Core detent member 15 Chuck body 16 Chuck ring 17 Repellent member

Claims (4)

A fitting means for an outer member and an inner member, wherein an engaging portion is formed on the inner surface of the outer member, and an engaging receiving portion for engaging with the engaging portion is formed on the outer surface of the inner member. An outer member characterized in that the inner shape of the engaging portion is formed slightly smaller than the outer shape of the engaging receiving portion, and a relief portion is formed behind the engaging portion or in front of the engaging receiving portion. A fitting structure between the inner member and the inner member. The fitting structure according to claim 1, wherein the outer member and the inner member are detachably fitted. The fitting structure according to claim 1 or 2, wherein the outer member is one component of a rod-shaped body feeding unit, and the inner member is one component of a writing body unit. 4. The fitting structure according to claim 3, wherein the cursive unit is composed of an outer cylinder and the inner member, and the outer member is interposed between the outer cylinder and the inner member.

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