JP4183531B2 - Female screw member mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a female screw member used in a molded casing or component of a television or a personal computer.
[0002]
[Prior art]
In recent years, recycling of electronic and electrical equipment has been regarded as important. In this recycling, for example, when an embedded nut is used in a mold housing such as a television, it is necessary to remove the embedded embedded nut. However, this removal work is extremely difficult, and there is a problem that the work efficiency is lowered.
[0003]
In order to solve such problems, conventionally, a male screw for a buried hole of a mold casing is formed, and a split groove for reducing the torque at the time of screwing is formed at the lower end portion of the peripheral wall of the buried nut. There has been proposed a method of taking out the embedded nut by rotating the torque using the cross groove at the top of the embedded nut (see Patent Document 1). In addition, a method of rotating the embedded nut from the resin member by torque rotation has been proposed (see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-241423
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-307561 [0006]
[Problems to be solved by the invention]
However, since both proposals rotate the embedded nut by torque, the fixing strength between the embedded nut and the mold housing is reduced. As a result, if a large tightening torque is required between the bolt and the embedded nut, the embedded nut There is a big problem that idling easily occurs between the mold and the mold casing.
[0007]
The present invention has been made in view of the above, and does not cause a decrease in the fixing strength between the mold body and the female screw member, and even if a large tightening torque is required between the male screw member and the female screw member, the mold is provided. An object of the present invention is to provide a female screw member mounting structure capable of suppressing and preventing idling between the body and the female screw member.
[0008]
[Means for Solving the Problems]
In the present invention, in order to solve the above-mentioned problem , a female screw member is attached to the mold body, a male screw member is attached to the female screw member, an attachment region for the female screw member is formed on the mold body, and the thickness thereof is increased. Partially thinning, destroying the thin portion of the attachment region by external force acting on the female screw member, removing the female screw member from the attachment region,
The mounting area of the mold body is used as an embedding hole, the thickness of the bottom is reduced, the bottom of the embedding hole is destroyed by an external force acting in the embedding direction of the female screw member, and the female screw member can be removed from the embedding hole. A breaker blade for a buried hole is formed at an end portion of the female screw member facing the inner bottom surface .
[0009]
The mold body can be a resin article for recycling.
In addition, a fixing projection claw that contacts the peripheral surface of the embedded hole can be formed on the outer peripheral surface of the female screw member.
Further, the protrusion claw of the female screw member may be gradually inclined as it goes from the embedding direction of the female screw member to the anti-embedding direction.
[0010]
Here, the mold body in the scope of claims includes at least synthetic resin recycling articles constituting various electric and electronic devices, such as mold casings and parts of televisions, personal computers, copying machines, transportation devices, and the like. . The female screw member includes various female screws and nuts (for example, a hexagonal nut, a square nut, etc.). Similarly, the male screw member includes various male screws (for example, wood screws, cross-recessed small screws) and bolts (for example, hexagon bolts, hexagon socket bolts, etc.). These screw members are classified into a triangular screw, a square screw, a trapezoidal screw, a sawtooth screw, a circular screw, and the like based on the screw thread, but any of them may be used. Further, the breaking blade may be a protrusion of various shapes or a blade, and does not ask for a plurality.
[0011]
According to the present invention, the female screw member breaks and exposes the thin portion in the mounting region of the mold body based on the action of an external force, so that the outer peripheral surface of the female screw member can be formed relatively freely.
Further, since the female screw member can be removed from the mold body before recycling, there are no metal parts that obstruct recycling, and as a result, the metal female screw member and resin can be easily recycled.
[0012]
Further, if the female screw member is provided with a sharp breaking blade, it is possible to easily break the thin portion of the attachment region as compared with the case where the end portion of the female screw member is flat.
Further, since the projection claw of the female screw member increases the contact resistance with the mold body, even when a relatively large tightening torque is required between the male screw member and the female screw member, the mold body and the female screw member It becomes possible to suppress idling in the meantime.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. The female screw member mounting structure in the present embodiment, as shown in FIG. 1 to FIG. The embedding hole 2 for the embedding nut 10 is formed to reduce the thickness of the bottom 3, and the embedding nut 10 is removed from the damaged bottom 3 of the embedding hole 2 by an external force applied in the embedding direction of the embedding nut 10. I have to.
[0014]
As shown in FIGS. 3 to 5, the cabinet 1 is injection-molded using, for example, a thermoplastic synthetic resin such as polystyrene, and the embedded hole 2 slightly smaller in diameter than the outer diameter of the embedded nut 10 is integrally formed. The embedded nut 10 is press-fitted and fixed to the bottom embedded hole 2 (see FIG. 4). The buried hole 2 is formed in a substantially bottomed cylindrical shape including a rib, and the bottom portion 3 is curved in a substantially hemispherical shape so as to be thinner than other portions, and the bottom portion 3 is easily damaged. .
[0015]
As shown in FIGS. 1 and 2, the embedded nut 10 has a sharply inclined breaking blade 11 for the embedded hole 2 at an end portion (in this embodiment, the lower end surface of the peripheral wall) facing the inner bottom surface of the embedded hole 2. The inner peripheral surface is formed with a screw 12 that is screwed with a bolt for mounting other members (not shown), and an embedded nut that contacts the inner peripheral surface of the embedded hole 2 in the axial direction of the outer peripheral surface. A plurality of fixing protrusions 13 are juxtaposed and a bolt is detachably screwed onto the screw 12. Each protrusion claw 13 is formed in a substantially saw-tooth shape and protrudes outward in the radial direction of the embedded nut 10, and from the embedded direction of the embedded nut 10 (downward direction in FIGS. 3 to 5) to the anti-embedded direction (in FIGS. 3 to 5). It gradually tilts in the upward direction, and functions to reduce the resistance of the embedded nut 10 in the burying direction and increase the resistance in the anti-buried direction.
[0016]
In the above configuration, when removing the embedded nut 10 embedded in the cabinet 1 before recycling, as shown in FIG. 5, for example, a pin 20 having a diameter smaller than the outer diameter of the embedded nut 10 is prepared. It is only necessary to press down on the embedded nut 10 or hit it (see the arrow in FIG. 5).
Then, the breaking blade 11 of the embedded nut 10 is applied to the weakened bottom portion 3 of the embedded hole 2 by an external force / impact acting in the embedded direction of the embedded nut 10, in other words, the screwing direction (upward to downward) of the bolt. The embedded nut 10 can be easily taken out by protruding through the embedded hole 2 where a part of the embedded nut 10 is opened.
[0017]
According to the above configuration, the breaking blade 11 of the embedded nut 10 breaks through the bottom 3 of the embedded hole 2 and opens, so that the outer peripheral surface of the embedded nut 10 can be freely formed. Therefore, the fixing strength between the embedded nut 10 and the cabinet 1 is not lowered, and the work efficiency can be greatly improved. In addition, since the sharp projecting claw 13 of the embedded nut 10 increases frictional force and resistance, even if a large tightening torque is required between the bolt and the embedded nut 10, there is nothing between the embedded nut 10 and the cabinet 1. No idling occurs.
[0018]
【The invention's effect】
As described above, according to the present invention, the thickness of the bottom portion is reduced by using the mounting region of the mold body as a buried hole, and the bottom portion of the buried hole is destroyed by an external force acting in the embedding direction of the female screw member. Can be removed from the embedding hole, and the breaking blade for the embedding hole is formed at the end of the female screw member facing the inner bottom surface of the embedding hole , which may cause a reduction in the fixing strength of the mold body and the female screw member. There is no effect. For example, even when a large tightening torque is required between the male screw member and the female screw member, idling between the mold body and the female screw member can be suppressed or prevented. Furthermore, if the female screw member is provided with a sharp breaking blade, it is possible to easily break the thin portion of the attachment region as compared with the case where the end portion of the female screw member is flat.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an embedded nut in an embodiment of a female screw member mounting structure according to the present invention.
FIG. 2 is a cross-sectional explanatory view showing an embedded nut in an embodiment of a female screw member mounting structure according to the present invention.
FIG. 3 is an explanatory cross-sectional view showing a state in which the embedded nut is fixed to the cabinet in the embodiment of the female screw member mounting structure according to the present invention.
FIG. 4 is a cross-sectional explanatory view showing a state in which an embedded nut is embedded in a cabinet in the embodiment of the female screw member mounting structure according to the present invention.
FIG. 5 is a cross-sectional explanatory view showing a state where the embedded nut is taken out in the embodiment of the female screw member mounting structure according to the present invention.
[Explanation of symbols]
1 Cabinet (mold body)
2 Buried hole (mounting area)
3 Bottom (thin part of the mounting area)
10 Embedded nut (female screw member)
11 Destruction blade 13 Protruding claw

Claims (4)

A female screw member is attached to the mold body, a male screw member is attached to the female screw member, an attachment region for the female screw member is formed on the mold body, and the thickness thereof is partially reduced to act on the female screw member. A female screw member mounting structure that destroys the thin portion of the mounting region by external force and removes the female screw member from the mounting region,
The mounting area of the mold body is used as an embedding hole, the thickness of the bottom is reduced, the bottom of the embedding hole is destroyed by an external force acting in the embedding direction of the female screw member, and the female screw member can be removed from the embedding hole. A female screw member mounting structure, wherein a breaking blade for a buried hole is formed at an end portion of the female screw member facing the inner bottom surface of the female screw member .   The female screw member mounting structure according to claim 1, wherein the molded body is a resin article for recycling. The female screw member mounting structure according to claim 1 or 2, wherein a fixing projection claw that contacts the peripheral surface of the embedded hole is formed on the outer peripheral surface of the female screw member. 4. The female screw member mounting structure according to claim 3, wherein the projection claw of the female screw member is gradually inclined from the embedding direction of the female screw member toward the anti-embedding direction .

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