JP2015133553A - Spring hole structure and fitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring hole structure and a fitting device with a rust proof function.SOLUTION: A spring hole 10 includes an opening 12 which is bored in a speaker holder 11 with a planar shape formed in a circle. The hole is formed having a prescribed height with respect to a front face of the speaker holder 11 with an approximately hollow cylindrical longitudinal section. Four ribs 13a, 13b, 13c and 13d are formed at intervals of 90 degrees on the inner wall of the hole. Height of respective ribs 13a-13d is arranged so that a spring does not contact with adjacent ribs of the ribs 13a-13d when the spring is inserted into the spring hole 10. Therefore, outer peripheral surface of the spring does not closely contact with the inner wall of the spring hole as before to be point/line contact so that moisture content kept by surface tension at a contact part or a peripheral part thereof between the outer peripheral surface of the inserted spring and an inner wall surface of the hole can be decreased, less likely to occur corrosion of the spring as a result.

Description

  The present invention relates to a spring hole structure and an attachment device, and more particularly to a structure of a spring hole through which a spring used for fixing a speaker panel of a ceiling speaker is inserted and an attachment device having the structure.

  The speaker panel of the ceiling speaker is provided with a spring on the lower side of the plate material so as to close an opening formed in a corresponding plate material portion on the front surface of a speaker (so-called ceiling speaker) placed on the upper side of the ceiling plate material. It is known to be fixed (see, for example, Patent Document 1). The spring for fixing the speaker panel is connected to a predetermined position of the speaker panel through a spring hole formed in a folding tool provided in a plate around the speaker, and the other end is directly or indirectly connected to the speaker. Tension springs coupled together.

Japanese Patent No. 3467320

  The ceiling to which the above-described ceiling speaker is attached tends to accumulate moisture, and the humidity tends to increase because ventilation air may pass through the speaker hole. The above-described spring hole is not an exception, and is exposed to moisture because of the opening of the spring hole on the speaker opening surface side. On the other hand, the conventional spring hole is a hollow cylindrical hole having a diameter slightly larger than the diameter of the spring for fixing the speaker panel (for example, 0.5 mm), and is very narrow. Therefore, the outer peripheral surface of the spring and the inner wall of the spring hole There are many contact surfaces, and the contact surface of the spring, its inside, and the periphery of the contact surface are difficult to dry. For this reason, in the conventional spring hole, there is a problem that moisture accumulates and the spring may be corroded and broken.

  This invention is made | formed in view of the above point, and it aims at providing the spring hole structure and attachment apparatus which have a rust prevention function.

  In order to achieve the above object, the spring hole structure of the present invention has a plurality of ribs in the circumferential direction of the spring hole on the inner wall of the generally hollow cylindrical spring hole whose inner diameter is larger than the outer diameter of the inserted spring. The plurality of ribs are formed so as to be separated from each other, and the spring does not contact the inner wall of the spring hole when the adjacent spring supports the spring at the time of insertion.

  Here, the plurality of ribs in the spring hole structure of the present invention may be formed in a vertically long shape that is long in the axial direction of the spring hole, and the opening of the spring hole is along the shape of the opening. It may be formed. Further, auxiliary ribs may be further formed between adjacent ribs in the opening. In order to achieve the above object, in the spring hole structure of the present invention, a slit penetrating from the inside of the hole to the outside of the hole may be formed in a wall surface portion of the wall surface of the spring hole where no rib is formed. .

In order to achieve the above object, the mounting device of the present invention includes an opening (25) drilled at a position corresponding to the opening surface of the speaker body (20) to be placed, and an outer peripheral portion of the speaker body. First and second spring holes (23a, 23b) of the spring hole structure of the present invention, which are respectively drilled at two opposite end positions on the outer side,
The speaker main body is mounted on the upper surface of the ceiling plate (27) with the ceiling speaker opening (28) drilled therein, and is inserted into the first and second spring holes, and By fixing both ends of the spring (24) inserted through the ceiling speaker opening to the speaker panel (29), the speaker panel is attached to the lower side of the ceiling plate so as to close the speaker opening by the contraction force of the spring. It is characterized by that.

  According to the present invention, it is possible to reduce the moisture accumulated in the contact portion between the outer peripheral surface of the spring to be inserted and the inner wall surface of the hole and the peripheral portion thereof, and as a result, the spring can be hardly corroded.

It is the top view and sectional drawing of one Embodiment of the spring hole structure of this invention. It is a perspective view of an example of a ceiling speaker. It is a longitudinal cross-sectional view of one Embodiment of the attachment apparatus of this invention. It is sectional drawing and side view of a ceiling speaker and speaker panel for the attachment method description of a speaker panel. It is explanatory drawing of the spring approach direction to the spring hole of one Embodiment of this invention. It is explanatory drawing of the rib which the spring which approached the spring hole of one Embodiment of this invention contacts. It is detail sectional drawing of the principal part of one Embodiment of the spring hole structure of this invention. It is a figure which shows the relationship between the cross section of each example of a spring and a rib. It is explanatory drawing of the starting angle of a rib. It is a figure which shows an example of the range of the rust of the spring inserted in the conventional spring hole structure and the spring hole structure of one Embodiment of this invention. It is sectional drawing and the perspective view of the principal part of the 1st modification of the spring hole structure of this invention. It is the top view of the 2nd modification of the spring hole structure of this invention, and sectional drawing of the principal part. It is the top view of the 3rd modification of the spring hole structure of this invention, and sectional drawing of the principal part.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1A and 1B show a plan view and a cross-sectional view of an embodiment of a spring hole structure according to the present invention. In FIGS. 2A and 2B, the spring hole 10 has a circular opening 12 formed in the speaker holder 11 and has a predetermined height with respect to the surface of the speaker holder 11. Is a hole having a generally hollow cylindrical longitudinal section whose inner diameter is larger than the outer diameter of the inserted spring. On the inner wall of the spring hole 10, four ribs 13a, 13b, 13c and 13d are formed at equal angular intervals of 90 degrees in a direction orthogonal to the axial direction of the spring hole.

  As shown in FIG. 1B, each of the ribs 13a, 13b, 13c, and 13d is longer in the same length as the axial direction of the spring hole than in the direction perpendicular to the axial direction of the spring hole. The height in the direction orthogonal to the inner wall surface of the spring hole 10 is formed to be, for example, 0.4 mm. The height of the ribs 13 a to 13 d is a value at which the spring does not contact the inner wall of the spring hole 10 when the spring at the time of insertion is supported by the adjacent rib. The radius of the opening 12 is 0.4 mm wider than that of the conventional spring hole. Therefore, the diameter of the virtual circle connecting the vertices in the height direction of the ribs 13a to 13d is the same as the diameter of the conventional spring hole. The details of the structure of the spring hole 10 will be described later.

  Here, the spring hole 10 of the present embodiment holds the speaker main body of the ceiling speaker on the upper surface of the ceiling plate material and closes the opening formed in the corresponding ceiling plate material portion on the front surface of the speaker main body. First, the ceiling speaker will be described since it is a spring hole formed in the speaker holder for holding the speaker panel below the ceiling plate material.

  FIG. 2 shows a perspective view of an example of a ceiling speaker. In the figure, the ceiling speaker 20 is composed of a speaker body 21 and a speaker holder 22. In FIG. 2, the speaker body 21 is shown obliquely behind the built-in speaker, and the front surface (opening surface) of the speaker is not shown in FIG. The speaker holder 22 is a holder indicated by 11 in FIG. 1A, in which the speaker main body 21 is fixed to the upper surface in order to support the speaker main body 21. The speaker holder 22 has spring holes 23 a and 23 b that are formed in two opposing positions on the outer peripheral portion of the speaker body 21. The spring holes 23a and 23b have the same structure, and one of them is shown as the spring hole 10 in FIG. The spring 24 is a tension coil spring that passes over the rear part of the speaker body 21 and is inserted into the spring holes 23a and 23b.

  FIG. 3 shows a longitudinal sectional view of an embodiment of the mounting apparatus according to the present invention. In FIG. 3, the same components as those in FIG. In FIG. 3, the spring 24 shown in FIG. 2 is not shown. In FIG. 3, the speaker holder 22 is an embodiment of the mounting device according to the present invention, and is mounted on the upper surface with the opening surface of the speaker body 21 (specifically, the sound emitting surface of the built-in speaker) on the lower side. It is fixed. The speaker holder 22 has an opening 25 at a position facing the opening surface of the speaker main body 21 of the speaker holder 22.

  The speaker main body 21 includes a driver unit 211 and a frame 212. The frame 212 has a through hole 213 formed in the center of the frame 212 and a through hole 214 formed in the periphery thereof.

  The frame 212 and the driver unit 211 have a rear end of the driver unit 211 and a surface facing the rear end of the driver unit 211 in the frame 212 fixed by an adhesive, and screws 215 are through holes in the frame 212. It is fixed by passing through 213 and screwing into a screw groove provided at the rear end of the driver unit 211.

  The through hole 214 is formed in order to confirm the application state such as the application amount and distribution of the adhesive interposed between the frame 212 and the driver unit 211.

  By the way, when the frame 212 is formed of a material different from that of the driver unit 211 (for example, in the case of a resin frame), when the speaker main body 21 is discarded, the driver unit 211 and the frame 212 are separated and discarded. It is desirable. With the screw 215 loosened or removed, the driver unit 211 and the frame 212 are easily separated by mechanically impacting the rear end of the driver unit 211 from the outside through the through hole 214. be able to.

  As described above, the through-hole 214 has a function of confirming the application state of the adhesive interposed between the frame 212 and the driver unit 211, and easily separates the driver unit 211 and the frame 212. It has the function of.

  In addition, the speaker holder 22 has spring holes 23 a and 23 b that are formed at two opposing positions on the outer peripheral portion of the speaker body 21. The spring holes 23a and 23b are substantially hollow cylindrical holes each having a predetermined height with respect to the surface of the speaker holder 22, and ribs 13 are formed on the respective inner walls. The rib 13 shown in FIG. 3 corresponds to two ribs among the ribs 13a to 13d shown in FIGS. That is, as shown in FIGS. 1A and 1B, the elongated ribs 13 are formed on the inner walls of the spring holes 23a and 23b at intervals of 90 degrees in the direction perpendicular to the axial direction of the spring holes. Four pieces are formed.

  Next, a method for attaching the speaker panel will be described with reference to cross-sectional views and side views of FIGS. 4A and 4B, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof is omitted. First, as shown in FIG. 4A, the ceiling speaker 20 shown in FIGS. 2 and 3 has the speaker body 21 with the opening surface side down, and one of the speaker holders 22 is slightly lifted. It is lifted and placed on the ceiling board 27 through the ceiling speaker opening 28 having a predetermined diameter formed in the ceiling board 27 while being in an oblique state. As shown in FIG. 4A, the placement position is such that the opening surface of the speaker body 21 corresponds to the ceiling speaker opening 28 of the ceiling plate 27.

  Next, as shown in FIG. 4A, the spring 24 is passed through the spring holes 23a and 23b. The spring 24 is provided with hooks 26a and 26b at both ends. Subsequently, after the operator pulls the hook 26 a by hand against the spring force of the spring 24 and hooks it on one end of the opposite ends of the speaker panel 29, the hook 26 b is similarly applied to the spring force of the spring 24. Pull the hand against the other end of the speaker panel 29 and release the hand. The spring 24 is a tension coil spring, and a spring whose contraction force is larger than the weight of the speaker panel 29 is used. Therefore, when the hand is released, the spring 24 automatically pulls the speaker panel 29 upward to the ceiling plate 27 and fixes the opening 28 to cover the opening 28 as shown in FIG. . In this manner, the speaker holder 22 as the mounting device of the present embodiment is opposed to the upper side and the lower side of the ceiling plate 27 by the spring 24 inserted through the speaker body 21 and the speaker panel 29 into the spring holes 23a and 24b. Let it attach.

  Next, the spring hole structure of this embodiment will be described in detail.

  4A and 4B, the spring 24 for fixing the ceiling speaker 20 and the speaker panel 29 has a central portion of the spring hole with respect to the spring holes 23a and 23b when the speaker panel 29 is fixed. Instead, it enters obliquely from the upper end toward the center of the spring hole. That is, as shown in the perspective view of FIG. 5, the spring is a spring hole 10 (corresponding to 23a and 23b in FIGS. 3 and 4) from the upper end of the spring hole as shown by an arrow A. The ribs 13a to 13d provided on the inner wall 10 are inserted so as to enter obliquely in the direction of the center portion (that is, the spring hole center portion).

  Here, in the spring hole structure of the present embodiment, when the height of each of the ribs 13 a to 13 d (the length from the inner wall of the spring hole 10 toward the center of the spring hole) is inserted into the spring hole 10. The ribs 13a to 13d are arranged at a height at which the spring does not contact with the adjacent rib. For this reason, when the spring is pulled so as to come out in the lower left direction in FIG. 5, when the spring enters the spring hole 10, for example, the spring 13 is pointed with the ribs 13 a and 13 b indicated by dotted circles in the plan view of FIG. 6. Contact. On the other hand, when the spring escapes, the spring makes point contact with the ribs 13c and 13d.

  In other words, no matter how the spring passes with respect to the spring hole 10, the outer peripheral surface of the spring does not come into close contact with the inner wall surface of the spring hole as in the prior art, and is in point / line contact. For this reason, according to the spring hole structure of the present embodiment, it is possible to reduce moisture accumulated due to surface tension at the contact portion between the outer peripheral surface of the spring and the inner wall surface of the hole and the peripheral portion thereof as compared with the conventional case. Corrosion can hardly occur.

  Next, a structure that can smoothly guide the spring in the spring hole structure of the present embodiment will be described. FIG. 7 is a cross-sectional view of the main part of an embodiment of the spring hole structure according to the present invention, and FIG. 8 is a view showing the relationship between the cross-section of each example of the rib and the spring. In FIG. 7, the same components as those in FIG. In the spring hole structure of this embodiment, the ribs 13a to 13d formed on the inner wall of the spring hole 10 have a vertically long shape extending in the axial direction of the hole, whereas the spring is a tension coil spring indicated by 24 in FIG. Since the wire is wound in a lateral direction substantially perpendicular to the axial direction of the hole, the spring is caught by the rib tip when the spring is pulled depending on the shape of the tip of the rib.

  That is, as shown in FIG. 8 showing the relationship between the spring and the cross section of the rib, the rib 132 having the tip portion 32 formed in a slightly curved surface is more than the rib 131 having the tip portion 31 formed at a right angle. It is difficult for the spring 24 to be caught, and the rib 133 having the tip 33 formed on a curved surface having a larger curvature can be less likely to be caught by the spring 24. Therefore, in the spring hole structure in the present embodiment, the ribs 13a to 13d are formed with the rib start position 15 from the opening surface on the entry side of the spring entering in the direction indicated by the arrow A in the spring hole 10, as shown in FIG. The length from the rib start position 15 to the rib height maximum position 16 is appropriate, and the structure has a substantially trapezoidal cross section in which the rib start angle θ shown in FIG. 9 is an appropriate angle. The ribs 13a to 13d have a generally triangular shape with the rib start position 15 at the apex, as shown in FIG. 7, from the rib start position 15 to the rib height maximum position 16. The length from the rib start position 15 to the rib height maximum position 16 is, for example, about 1 mm.

  Furthermore, in the spring hole structure of this embodiment, in order to allow the spring to be smoothly inserted into the spring hole 10, the spring hole 10 is formed from a tip portion corresponding to the opening surface of the spring hole as shown by 14 in FIG. A portion up to immediately before the rib start position 15 is not a right angle but is formed in a curved surface shape having a certain curvature (for example, R1.5).

  Next, two comparative experimental results of the spring hole structure of the present embodiment described above and the conventional spring hole structure will be described.

<Comparison experiment 1>
For each of the spring hole structure of the present embodiment with ribs and the conventional spring hole structure without ribs under conditions of a temperature of 26.6 ° C. (room temperature) and a humidity of 45%, each is immersed in water with a spring inserted. An experiment was conducted to confirm which one loses moisture quickly when left standing for a certain period of time (3 trials of 20 minutes, 40 minutes, and 60 minutes). As a result, in the conventional spring hole structure, water remained after 60 minutes, but in the spring hole structure of this embodiment, the water almost disappeared after 40 minutes, and when 60 minutes passed, the water was completely lost. Was confirmed.

<Comparison experiment 2>
The spring hole structure of this embodiment with ribs and the conventional spring hole structure without ribs under conditions of salt concentration 5% (± 1%) and intermittent 4 cycles 96 hours (1 cycle 8 hours salt spray 16 hours) About each of these, the salt spray experiment was done in the state which inserted the spring. When the state of rust was confirmed 96 hours after the start of the experiment, the range of rust in the horizontal cross section of the spring insertion portion was the range indicated by 41 in FIG. 10 (A) for the spring inserted in the conventional spring hole structure, In the spring inserted into the spring hole structure of the present embodiment, the range indicated by 42 in FIG. 10B is present, and the spring inserted into the spring hole structure of the present embodiment has a larger range in which rust does not exist. Was confirmed.

  As described above, in both of the comparative experiments 1 and 2, the spring hole structure of the present embodiment is closer to the contact portion between the outer peripheral surface of the spring and the inner wall surface of the hole and its peripheral portion than the conventional spring hole structure. It was confirmed that the moisture accumulated by the surface tension could be reduced quickly, and as a result, the spring could not be easily corroded by rust.

  In addition, this invention is not limited to the above embodiment, The following various modifications are also included. FIGS. 11A and 11B show a cross-sectional view and a perspective view of a main part of a first modification of the spring hole structure according to the present invention. In FIGS. 1A and 1B, the same components as those in FIGS. 1A and 1B are denoted by the same reference numerals, and description thereof is omitted. 11A and 11B, the spring hole 50 of this embodiment is characterized in that slits 52, 53, and 54 penetrating from the inside of the hole to the outer periphery of the hole are formed. The spring hole 50 has a generally hollow cylindrical shape having a circular opening 51 formed in the speaker holder 11 and having a predetermined height with respect to the surface of the speaker holder 11. It is a hole having a longitudinal section, and the inner wall has four ribs 13a, 13b, 13c and 13d formed at equal angular intervals of 90 degrees in a direction orthogonal to the axial direction of the spring hole. This is the same as the spring hole 10 of the embodiment. According to this modification, the air permeability inside the spring hole 50 becomes better than that of the spring hole 10, and a higher rust prevention effect on the spring can be exhibited.

  12A and 12B are a plan view and a cross-sectional view of the main part of a second modification of the spring hole structure according to the present invention. A spring hole 60 shown in FIGS. 4A and 4B is a hole having a generally hollow cylindrical longitudinal section having a circular opening 61, and an inner wall thereof has an end of the opening 61, that is, an opening end. This is a structure in which four ribs 62a to 62d extending up to are formed. The ribs 62a to 62d are formed at equal angular intervals of 90 degrees in a direction orthogonal to the axial direction of the spring hole. The four ribs 62a to 62d in this modification are immediately bent as shown in FIGS. 4A and 4B at the opening end of the spring hole 60 when two adjacent ribs are inserted into the spring hole 60. The height of the spring 24 is set so as not to contact the inner wall of the spring hole 60 when the spring 24 is supported. For this reason, in this modification, even if the spring is bent at the opening end of the spring hole 60, there is an effect that it is not necessary to touch the inner wall of the spring hole 60.

  FIGS. 13A and 13B are a plan view of a third modification of the spring hole structure according to the present invention and a cross-sectional view of a main part taken along line II of FIG. 13A and 13B, the same components as those in FIGS. 12A and 12B are denoted by the same reference numerals, and description thereof is omitted. The spring hole 70 shown in FIGS. 13A and 13B has a rib 63a only between the four ribs 62a to 62d formed on the inner wall of the spring hole 60 shown in FIG. This is a structure in which 63b, 63c and 63d are added.

  As shown in FIG. 13A, when the spring is bent along the opening of the spring hole 70, the rib interval a at the opening end is wider than the rib interval b inside the hole. In the spring holes 10, 50, 60, there is a possibility that the spring contacts the inner wall near the open end of the spring hole. Therefore, in the spring hole 70 of this modification, the ribs 63a, 63b, 63c and 63d are added as auxiliary ribs only in the vicinity of the opening end, so that the spring is formed on the inner wall near the opening end of the spring hole. The phenomenon of contact can be prevented. Here, when adding a rib near the open end, the auxiliary rib to be added has a radial height set so that the spring does not touch the inner wall of the spring hole at the open end, You may narrow the space | interval of the circumferential direction of the rib to arrange | position.

  In addition to the above-described modification, even in the spring hole structure in which one or several annular ribs parallel to the opening surface of the spring hole are formed on the inner wall of the spring hole, the spring is formed on the inner wall near the opening end of the spring hole. The phenomenon of contact can be prevented.

  Further, when the spring extends in a direction shifted from the spring hole axis, the interval between the ribs on the opening end side where the spring extends may be narrowed by setting the interval between the ribs as unequal intervals. As a result, even if the spring is displaced due to an impact and comes off between the ribs, it will fit between the adjacent ribs so that it does not contact the inner wall of the spring hole near the open end more securely. Can be.

  Moreover, the spring hole structure which removed the spring hole wall surface part of the position facing the rib which the spring bent at the opening end of the spring hole contacts may be sufficient. Further, a rib may be formed on the inner wall near the open end of the spring hole in a spiral shape in the direction opposite to the winding direction of the spring (tensile coil spring) to be inserted. In this case, the spring can be inserted without being caught by the rib, and the spiral rib can prevent the spring from coming into contact with the inner wall near the opening end of the spring hole.

10, 23a, 23b, 50, 60, 70 Spring hole 11, 22 Speaker holder 13, 13a, 13b, 13c, 13d, 62a, 62b, 62c, 62d Rib 63a, 63b, 63c, 63d Auxiliary rib 14 Curved surface 15 Rib start Position 16 Rib height maximum position 20 Ceiling speaker 21 Speaker body 24 Spring 25 Openings 26a, 26b Hook 27 Ceiling plate 28 Ceiling speaker opening 29 Speaker panel

Claims (6)

A plurality of ribs are formed apart from each other in the circumferential direction of the spring hole on the inner wall of the generally hollow cylindrical spring hole whose inner diameter is larger than the outer diameter of the inserted spring.
The spring hole structure, wherein the plurality of ribs do not contact the inner wall of the spring hole when the spring at the time of insertion is supported by adjacent ribs.   The spring hole structure according to claim 1, wherein the plurality of ribs are formed in a vertically long shape that is long in an axial direction of the spring hole.   The spring hole structure according to claim 1, wherein the plurality of ribs are formed along the shape of the opening at the opening of the spring hole.   The spring hole structure according to any one of claims 1 to 3, wherein an auxiliary rib is further formed between adjacent ribs in the opening.   The slit which penetrates from the inside of a hole to the exterior of a hole is formed in the wall surface part in which the said some rib is not formed among the wall surfaces of the said spring hole, The Claim 1 thru | or 4 characterized by the above-mentioned. The spring hole structure described. An opening formed at a position corresponding to the opening surface of the speaker main body to be placed;
The first and second spring holes of the spring hole structure according to any one of claims 1 to 5, wherein the first and second spring holes are formed at two opposite end positions outside the outer periphery of the speaker body, respectively.
With
The ceiling speaker is mounted on an upper surface of a ceiling board having an opening for a ceiling speaker, the speaker body is attached to the upper side of the ceiling board, and the ceiling speaker is inserted through the first and second spring holes. The speaker panel is attached to the lower side of the ceiling plate so as to close the speaker opening by the contraction force of the spring by fixing both ends of the spring inserted through the opening for the speaker to the speaker panel. Mounting device.