JP7459529B2 - Fastening structure for electronic device and electronic device equipped with same - Google Patents

Description

This disclosure relates to a fastening structure for electronic devices using screws and an electronic device equipped with the same.

Generally, electronic devices are attached to various locations such as other components, ceilings, and walls using screws. In order to efficiently perform installation and removal of electronic devices, a fastening structure is required that prevents the screw from getting caught in the electronic device and the screw from falling out of the electronic device when the fastening with the screw is released. For example, Patent Document 1 discloses a structure in which a coil spring and a washer are inserted between the screw part and the knob part, and after inserting it into the thumb screw hole, an E-shaped washer is fitted into the neck part to fix the electronic device. The coil spring acts to lift the thumb screw upward, preventing the electronic device body from interfering with the thumb screw when the electronic device is attached or detached. In addition, by fitting the E-shaped washer, the E-shaped washer is hooked after the screw engagement is released, preventing the screw from falling out of the electronic device. In addition, Non-Patent Document 1 discloses a knurled knob with a spring.

Utility Model Publication No. 5-96519

Website "MonotaRO", Spring-loaded knurled knob (threaded part M3) https://www.monotaro.com/p/6110/1714/

However, in conventional structures, the space in which the coil spring is stored and the space in which the anti-fall-out member moves as the screw moves by the amount of the screw engagement are arranged in series, which creates the problem that the members required for fastening and releasing the screw are long.

The present disclosure has been made to solve the problems described above, and aims to provide a fastening structure for electronic devices in which the components required for fastening and releasing the screws are low-profile while preventing the screws from getting caught or falling off when releasing the fastening with the screws, and an electronic device equipped with the same.

Further, the fastening structure for an electronic device according to the present disclosure includes a screw having a head and a shaft portion in which a thread is formed at least in part, and a base surface having a through hole into which the shaft portion of the screw is inserted. and a first fastened member having a flange portion protruding from the base surface so that the opening end of the through hole is narrowed; a falling-off prevention member provided inside the through hole of the member; a second fastened member arranged in line with the first fastened member along the axial direction of the screw and screwed with the screw in the screw hole; In the fastened state of the screw, an elastic member is provided inside the screw hole of the second fastened member, and is abutted against the end of the shaft opposite to the head of the screw and stored in a compressed state. .

The fastening structure for electronic devices disclosed herein is configured such that the elastic member is stored in a groove formed on the outside of the through hole of the first fastened member, and the anti-fall-out member is provided on the inside of the through hole of the first fastened member, thereby making it possible to reduce the height of the members required for fastening and releasing the screws while preventing the screws from getting caught or falling off when releasing the screw fastening.

In addition, according to the fastening structure for electronic devices disclosed herein, the elastic member is stored in a compressed state inside the screw hole of the second fastened member, abutted against the end of the shaft portion opposite the head of the screw, and the anti-fall-out member is provided inside the through hole of the first fastened member, thereby making it possible to reduce the height of the members required for fastening and releasing the screw while preventing the screw from getting caught or falling off.

1 is a cross-sectional view showing a schematic configuration of a fastening structure for an electronic device according to Embodiment 1. FIG. 2 is a cross-sectional view showing a schematic configuration of a fastening structure for an electronic device according to a first embodiment before fastening; 1 is an explanatory diagram showing a comparative example of a fastening structure for an electronic device according to embodiment 1; 11 is a cross-sectional view showing a schematic configuration of a fastening structure for an electronic device according to a second embodiment. FIG.

Embodiment 1.
An example of a fastening structure for an electronic device will be described below, but the present invention is not limited to this configuration.

FIG. 1 is a sectional view showing a schematic configuration of a fastening structure for an electronic device according to a first embodiment. FIG. 1 shows a state in which electronic equipment is fastened with screws. As shown in FIG. 1, a fastening structure 100 for an electronic device according to the present embodiment includes a screw 1, a first fastened member 2 into which the screw 1 is inserted, and a first fastened member 2 along the axial direction of the screw 1. A second member 3 to be fastened is disposed in line with the member 2 to be fastened, and is threadedly engaged with the screw 1.

The screw 1 has a head 1a and a shaft 1b with a thread formed at least partially thereon. The screw 1 is, for example, a bolt, a screw, etc. In the following description, "upper" refers to the head 1a side in the axial direction of the screw 1, and "lower" refers to the opposite side.

The first fastened member 2 has a base surface 21 on which the head 1a of the screw 1 is provided, and a through hole 2a is formed in the base surface 21, into which the shank 1b of the screw 1 is inserted. In the fastened state, the shank 1b of the screw 1 is surrounded by, for example, the inner wall 22 of the through hole 2a. A washer 4 is provided on the base surface 21 of the first fastened member 2 so as to surround the through hole 2a. In the fastened state, the washer 4 is sandwiched between the underside of the head 1a of the screw 1 and the base surface 21 of the first fastened member 2.

A groove portion 2b extending along the axial direction of the screw 1 is formed in the base surface 21 of the first fastened member 2 on the outside of the through hole 2a. An elastic member 5 is housed in the groove 2b. In the example shown in FIG. 1, the groove portion 2b is formed in an annular shape so as to surround the through hole 2a, and a coil spring is accommodated as the elastic member 5. The groove portion 2b does not penetrate the first fastened member 2 and has a bottom surface 2c. Further, the groove portion 2b is covered with a washer 4 so as to cover it from above. Therefore, the outer diameter of the washer 4 is larger than the outer diameter of the groove portion 2b and the outer diameter of the elastic member 5. In the fastened state, the elastic member 5 is pressed against the bottom surface 2c by the washer 4 and is stored in the groove 2b in a compressed state. In this way, by storing the elastic member 5 in the first fastened member 2, when the screw 1 is unfastened, the elastic member 5 pushes up the screw 1, so that the screw 1 can be loosened without getting caught. Here, the washer 4 is not an essential component, and may not be used if the outer diameter of the head 1a of the screw 1 is large enough to cover the groove 2b.

The first fastened member 2 also has a flange portion 2d that protrudes from the base surface 21 on which the head portion 1a of the screw 1 is provided so that the opening end of the through hole 2a narrows. The inner diameter of the through hole 2a is smaller than the outer diameter of the head 1a of the screw 1 at the flange portion 2d. Further, the inner diameter of the through hole 2a is larger than the outer diameter of the shaft portion 1b of the screw 1 below the flange portion 2d. As a result, the shaft portion 1b of the screw 1 and the inner wall 22 of the through hole 2a of the first fastened member 2 are not in contact with each other, so that when releasing the screw fastening, the shaft portion 1b of the screw 1 does not get caught on the first fastened member 2. Can be loosened.

The first member 2 to be fastened can be manufactured, for example, from a resin molded product, thereby realizing the through hole 2a, the groove portion 2b, and the flange portion 2d.

A falling-off prevention member 6 is fitted into the thread of the shaft portion 1b of the screw 1. The falling-off prevention member 6 is, for example, an annular resin washer. The falling-off prevention member 6 can be realized by a metal washer or a thin molded product as long as it can be fixed to the thread of the shaft portion 1b. The fall prevention member 6 is provided inside the through hole 2a below the flange portion 2d of the first fastened member 2. The outer diameter of the falling-off prevention member 6 is larger than the inner diameter of the opening end of the flange portion 2d on the through-hole 2a side.

In this way, by providing the anti-slip member 6 on the inside of the through hole 2a below the flange portion 2d of the first fastened member 2, when the screw is released and the elastic member 5 pushes up the screw 1, the anti-slip member 6 gets caught on the flange portion 2d of the first fastened member 2, preventing the screw 1 from falling out of the first fastened member 2 and becoming completely separated.

The second fastened member 3 has a female thread formed in the screw hole 3a, and is screwed into the screw 1. Here, if the screw 1 is a tapping screw, there is no need to provide a female thread in the screw hole 3a in advance. The second fastened member 3 only needs to be formed with a female thread, and can be realized within the scope of existing technology by threading a resin molded product or a sheet metal.

Next, the procedure for fastening the first fastened member 2 and the second fastened member 3 with the screw 1 will be described. Figure 2 is a cross-sectional view showing the schematic configuration of the fastening structure of the electronic device according to the first embodiment before fastening.

As shown in FIG. 2(a), the shaft portion 1b of the screw 1 is passed through the washer 4. Further, the elastic member 5 is inserted into the groove portion 2b of the first member 2 to be fastened. Then, as shown in FIG. 2(b), the shaft portion 1b of the screw 1 passed through the washer 4 is passed through the through hole 2a of the first member 2 to be fastened. Thereafter, the fall prevention member 6 is attached to the shaft portion 1b of the screw 1 located below the flange portion 2d. At this time, it is preferable to adjust the attachment position so that the fall prevention member 6 does not come into contact with the first fastened member 2 and the second fastened member 3 in the fastened state. By preventing the falling-off prevention member 6 from coming into contact with other members, the screw 1 can be easily turned.

From the state shown in Figure 2, screw 1 is screwed into threaded hole 3a of second fastened member 3. Here, the anti-slip member 6 is attached by engaging with the threads of shaft portion 1b of screw 1, so it will not come off screw 1 unless it is rotated along the threads. As screw 1 is screwed into second fastened member 3, anti-slip member 6 moves together with screw 1. Then screw 1 seats on washer 4 and fastening is completed.

Here, in the fastened state shown in FIG. 1, the length A from the underside of the flange portion 2d to the upper surface of the anti-slip member 6 must be greater than the length C of the engagement between the screw 1 and the second fastened member 3. When the screw 1 is loosened, the anti-slip member 6 moves upward together with the screw 1. By making A > C, it is possible to prevent the anti-slip member 6 from coming into contact with the flange portion 2d of the first fastened member 2 until the screw 1 is released from the second fastened member 3, and it becomes possible to separate the screw 1 and the second fastened member 3.

Next, the effect of the fastening structure 100 for electronic devices according to this embodiment will be described. FIG. 3 is a comparative example for describing the fastening structure for electronic devices according to the first embodiment. In this comparative example, the elastic member 5 is inserted into the through hole 2a into which the shank 1b of the screw 1 is inserted, rather than into the groove 2b of the first fastened member 2. The through hole 2a is formed with a flange 2d that protrudes so that the inner diameter is narrowed in the middle of the axial direction of the screw 1, and the elastic member 5 is supported by the flange 2d. Furthermore, below the elastic member 5 and the flange 2d, the anti-falling member 6 is fitted onto the shank 1b of the screw 1. That is, in this comparative example, the space in which the elastic member 5 is stored and the space in which the anti-falling member 6 moves with the movement of the screw 1 by the engagement allowance are arranged in series.

Therefore, in the comparative example, in order to realize the fastening of the screw 1, the length B of the space in which the elastic member 5 is accommodated in the axial direction of the screw 1, and the distance between the lower surface of the flange portion 2d and the upper surface of the fall prevention member 6 are required. The minimum length was required to be the sum of the length A and the engagement length C of the screw 1 of the second fastened member 3. Further, the length of the first fastened member 2 in the axial direction of the screw 1 is determined by the length B of the space in which the elastic member 5 is accommodated, the thickness of the flange portion 2d, and the falling-off prevention member from the lower surface of the flange portion 2d. The minimum length required was the sum of the length A to the top surface of the member 6 and the thickness of the fall prevention member 6.

In contrast, in the fastening structure 100 for an electronic device according to the present embodiment, the elastic member 5 is housed in the groove 2b provided on the outside of the through hole 2a, and the fall prevention member 6 is provided on the inside of the through hole 2a. And so. Therefore, in the fastening structure 100 for an electronic device, the length of the screw 1 can be made shorter by the length B of the groove 2b in which the elastic member 5 is accommodated, compared to the comparative example. Similarly, the axial length of the first fastened member 2 can be made shorter by the length B of the groove 2b in which the elastic member 5 is accommodated, compared to the comparative example. That is, when releasing the screw fastening, it is possible to reduce the height of the first fastened member 2 while preventing the screw 1 from getting caught and falling off.

When electronic devices are subjected to environmental loads, for example when the product is subjected to large changes in operating temperature and repeatedly loaded, thermal contraction can repeatedly cause dimensional changes in the first fastened member 2, which can cause the screw 1 to loosen. In particular, when the first fastened member 2 is made of resin, the impact of thermal contraction is large. In the fastening structure 100 for electronic devices according to this embodiment, the height of the first fastened member 2 is reduced, thereby suppressing the impact of such thermal contraction and preventing the screw 1 from loosening, thereby ensuring the long-term reliability of the electronic device.

Embodiment 2.
Next, a second embodiment of the present disclosure will be described. In the first embodiment, the elastic member 5 is housed in the groove 2b outside the through hole 2a of the first fastened member 2 into which the shaft 1b of the screw 1 is inserted. In the fastening structure 200 for an electronic device according to the present embodiment, the elastic member 5 is brought into contact with the end of the shaft portion 1b of the screw 1 in the screw hole 3a of the second fastened member 3 into which the screw 1 is screwed. It is designed to be stored in a compressed state.

Figure 4 is a cross-sectional view showing a schematic configuration of the fastening structure of an electronic device according to embodiment 2. As shown in Figure 4, the fastening structure 200 of an electronic device includes a screw 1, a first fastened member 2, and a second fastened member 3. A through hole 2a into which the shank 1b of the screw 1 is inserted is formed on the base surface 21 of the first fastened member 2. A washer 4 is provided on the base surface 21 of the first fastened member 2 so as to surround the through hole 2a. Here, the washer 4 is not an essential component. The first fastened member 2 also has a flange portion 2d that protrudes from the base surface 21 so as to narrow the opening end of the through hole 2a. A fall prevention member 6 is fitted to the shank 1b of the screw 1. The fall prevention member 6 is arranged inside the through hole 2a of the first fastened member 2 in the fastened state. A screw hole 3a into which the screw 1 is screwed is formed on the second fastened member 3. Inside the screw hole 3a, an elastic member 5 is placed in a compressed state in contact with the end of the shaft 1b opposite the head 1a of the screw 1. The elastic member 5 may be, for example, a pin plunger.

As described above, in the fastening structure 200 for an electronic device according to the present embodiment, the fall prevention member 6 is provided in the through hole 2a into which the screw 1 of the first fastened member 2 is inserted, and the elastic member 5 is provided in the through hole 2a into which the screw 1 of the first fastened member 2 is inserted. The screw hole 3a of the second member 3 to be fastened is provided in a compressed state in contact with the end of the shaft portion 1b opposite to the head portion 1a of the screw 1.

As a result, similar to the first embodiment, the length of the screw 1 and the length of the first fastened member 2 are reduced in the groove portion 2b in which the elastic member 5 is accommodated, compared to the comparative example shown in FIG. It can be shortened by length B. When releasing the screw fastening, it is possible to reduce the height of the first fastened member 2 while preventing the screw 1 from getting caught and falling off, and the long-term reliability of the electronic device can be ensured. .

The configuration shown in the above embodiments is an example, and it is possible to combine it with another known technology, and a part of the configuration can be omitted or changed without departing from the gist. It is possible.

REFERENCE SIGNS LIST 1 screw 1a head 1b shaft 2 first fastened member 2a through hole 2b groove 2c bottom surface 2d flange 3 second fastened member 3a screw hole 4 washer 5 elastic member 6 fall-off prevention member 21 base surface 22 inner wall 100, 200 fastening structure for electronic device

Claims (2)

a screw having a head and a shaft portion with a thread formed on at least a portion thereof;
a first fastened member having a base surface in which a through hole into which the shaft portion of the screw is inserted is formed, and a flange portion protruding from the base surface so that an open end of the through hole is narrowed;
a falling-off prevention member that is fitted to the shaft portion of the screw and is provided inside the through hole of the first fastened member in the fastened state of the screw;
a second member to be fastened, which is arranged in line with the first member to be fastened along the axial direction of the screw, and is threadedly engaged with the screw in a screw hole;
When the screw is in a fastened state, it is stored in a compressed state inside the screw hole of the second fastened member, in contact with the end of the shaft opposite to the head of the screw. A fastening structure for an electronic device, comprising an elastic member. An electronic device comprising the fastening structure according to claim 1 .

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