JP5860740B2 - Case cover structure - Google Patents

Description

  Embodiments described herein relate generally to a housing cover structure that covers a housing of an electronic device.

  The housing of a conventional aircraft-mounted device is covered with a housing cover that is an independent flat panel on both the left and right side surfaces, the top surface, and the bottom surface of the housing. Here, the left side surface of the housing is screwed to the left side surface cover, the right side surface is screwed to the right side surface cover, and the bottom surface is screwed to the bottom surface cover. Further, a top cover is fastened to the top surface of the housing.

JP 2007-27656 A JP 2004-6546 A

  As in the above-described conventional configuration, the case cover with a four-sided structure in which the left and right side surfaces, the upper surface, and the bottom surface of the case are covered with independent case covers has a large number of parts and is inferior in maintainability and cost. Therefore, it is desired to integrate the housing cover.

  In addition, the housing cover of the aircraft-mounted device is required to satisfy the following conditions.

(1) The cover should be of an integral structure.
(2) To reduce the number of fixed parts as much as possible to improve maintainability.
(3) Screws have a fall-off prevention structure.
(4) Excellent rigidity and strength and light weight.
(5) Screws should not protrude from the housing.
(6) Excellent EMI property.
(7) A floating structure so as to absorb dimensional errors.
(8) Do not sacrifice the effective space inside the chassis. It can be installed in a small space.
(9) Low cost.

  The biggest problem among these conditions is (8) “Do not sacrifice the effective space inside the chassis. This is because the conventional split cover structure can be attached to the housing even if a member for incorporating a screw, fastener, or the like protrudes inside each cover. However, in the case of a cover having an integral structure, the cover is slid and placed on the housing, so that the protrusion inside the cover interferes with the housing. For this reason, it is necessary to provide a “relief portion” in the housing for preventing interference with the projection inside the cover when the cover is attached. This “relief” space becomes a dead space, reducing the effective space of the housing. Therefore, in an aircraft-mounted device that requires high-density mounting, securing the effective space of the housing is an important factor, and thus it is desired to prevent a reduction in the effective space of the housing.

  The present embodiment has been made paying attention to the above circumstances, is excellent in maintainability and cost, and can prevent a reduction in the effective space of the housing even when the cover is slid onto the housing. The object is to provide a body cover structure.

According to the embodiment, the three-sided integrated case cover that covers the three surfaces of the opposite two side surfaces and the upper surface of the case is provided. A plurality of fixing portions having screw holes for fixing the housing cover are provided in the housing, and a portion of the housing cover corresponding to the fixing portion of the housing is depressed toward the inside of the housing cover. And a recess having a size capable of accommodating a head of a fixing screw screwed into the screw hole of the housing. A fixing position where the male screw portion of the fixing screw is screwed into the screw hole to the inner bottom portion of the concave portion of the housing cover, the male screw portion of the fixing screw is removed from the screw hole, and the head of the fixing screw is removed from the screw hole. A screw drop prevention portion is provided that is supported so as to be movable between a fixed release position that protrudes to the outside of the recess. The screw drop-off prevention portion has a cylindrical inner guide that is mounted in an insertion hole of the fixing screw formed in an inner bottom portion of the recess of the housing cover so as to be movable in the insertion / removal direction of the fixing screw. One end portion of the inner guide is held in a portion of a shaft portion between the male screw portion and the head portion of the fixing screw so as to be movable in the insertion / removal direction of the fixing screw, and the other end portion of the inner guide is When the fixing screw is moved to the fixing release position, a stopper is provided that contacts the peripheral portion of the insertion hole of the fixing screw and prevents the fixing screw from falling out of the fixing screw through the outside.

The longitudinal cross-sectional view which shows the fixing | fixed part of the housing | casing and housing | casing cover in the housing | casing cover structure of 1st Embodiment. The longitudinal cross-sectional view which shows the state which removed the fixing screw of the housing | casing cover in the housing | casing cover structure of 1st Embodiment, and moved it to the fixing release position. The top view which shows the attachment state of the nut plate in the housing | casing cover structure of 1st Embodiment. The longitudinal cross-sectional view which shows the attachment state of the nut plate in the housing | casing cover structure of 1st Embodiment. The longitudinal cross-sectional view which expands and shows the attachment part of the inner guide in the housing | casing cover structure of 1st Embodiment. The longitudinal cross-sectional view which shows the inner guide in the housing | casing cover structure of 1st Embodiment. The top view which shows the retaining ring of the inner guide in the housing | casing cover structure of 1st Embodiment. 1A and 1B are side views showing a state before a housing cover is attached to a housing, and FIG. 3B is a side view showing a state where the housing cover is attached to the housing. Explanatory drawing for demonstrating the state which the member which protrudes inside the cover interferes with a housing | casing at the time of the operation | work which attaches a housing | casing cover to a housing | casing. The side view which shows the inclination-angle of the flare part between the plane of the head end surface of the fixing screw of 1st Embodiment, and a shaft part. The longitudinal cross-sectional view of the principal part which shows the screw hole of the wall surface of the housing | casing in the housing | casing cover structure of 2nd Embodiment.

[First Embodiment]
(Constitution)
1 to 10 show a first embodiment. FIG. 1 is a longitudinal cross-sectional view showing a fixed portion between a housing 1 and a housing cover 2 in a housing cover structure of a housing of an aircraft-mounted device according to the first embodiment. As shown in FIG. 8 (A), the housing cover 2 of the present embodiment has a three-surface integrated type U that covers three surfaces of the housing 1 on the left and right sides 1a, 1b and the upper surface 1c. A character-shaped cover body 3 is provided. That is, the cover main body 3 includes a left side cover 3 a that covers the left side 1 a of the housing 1, a right side cover 3 b that covers the right side 1 b of the housing 1, and an upper surface that covers the top surface 1 c of the housing 1. And a cover 3c.

  The housing 1 is provided with a plurality of fixing portions 5 having screw holes 4 for fixing the housing cover 2. As shown in FIGS. 3 and 4, the fixing portion 5 includes a nut plate (nut member) 6 that is separate from the casing 1 fixed to the chassis 1 d of the casing 1. As for this nut plate 6, the screw hole 4 is formed in the center site | part of the plate main body 6a. The nut plate 6 has a plate body 6a fixed to the chassis 1d by a pair of first screws 7a and 7b and second screws 8a and 8b.

  Further, a concave portion 9 that is recessed by drawing toward the inside of the housing cover 2 is provided in a portion of the housing cover 2 that corresponds to the fixing portion 5 of the housing 1. The depth of the recess 9 is set to a size that can accommodate the head 10 a of the fixing screw 10 that is screwed into the screw hole 4 of the housing 1.

  An insertion hole 11 through which the fixing screw 10 is inserted is formed in the inner bottom portion of the recess 9 of the housing cover 2. Furthermore, a screw fall prevention portion of a floating structure that supports the fixing screw 10 around the insertion hole 11 so as to be movable in the direction in which the fixing screw 10 is inserted into and removed from the insertion hole 11 (in the axial direction of the fixing screw 10) 12 is provided. The screw drop-off prevention part 12 removes the male screw part 10b of the fixing screw 10 from the screw hole 4 and a fixing position (see FIG. 1) where the male screw part 10b of the fixing screw 10 is screwed with the screw hole 4. The fixing screw 10 is supported so as to be movable in the direction of insertion / removal from the insertion hole 11 between the fixing release position (see FIG. 2) in which the head 10 a of the fixing screw 10 protrudes to the outside of the recess 9. As shown in FIG. 8A, the housing cover 2 is provided with the screw drop-off prevention portions 12 on at least two side surfaces facing the left and right two side surfaces 1a and 1b of the housing 1.

  Further, the screw drop-off prevention unit 12 includes a flip-up mechanism 16 for the fixing screw 10 including a cylindrical inner guide 13, a washer member 14 for the fixing screw 10, and a coil spring (spring member) 15. The inner guide 13 is disposed around the shaft portion 10c between the head portion 10a of the fixing screw 10 and the male screw portion 10b, and is attached to the insertion hole 11 so as to be movable in the insertion / removal direction of the fixing screw 10. Yes. Here, a flange-shaped first stopper 13 a protruding outward is formed at the upper end of the inner guide 13 in FIG. 1. In addition, a flange-like second stopper (fixed screw movement restricting portion) 13 b protruding inward is formed at the lower end portion of the inner guide 13 in FIG. 1. The second stopper 13b of the inner guide 13 is held so as to be movable in the axial direction of the fixing screw 10 along the shaft portion 10c between the head portion 10a of the fixing screw 10 and the male screw portion 10b.

  Furthermore, as shown in FIG. 6, the inner guide 13 is formed with a ring-shaped groove 13c on the outer peripheral surface of the second stopper 13b. A retaining ring 17 is fitted in the ring-shaped groove 13c. The retaining ring 17 is formed of a C-shaped C-ring as shown in FIG. The inner diameter of the retaining ring 17 is set to be substantially the same as the inner diameter of the ring-shaped groove 13c.

  The inner guide 13 is held so that the second stopper 13b can be engaged with a terminal portion of the male screw portion 10b (a connecting portion between the male screw portion 10b and the shaft portion 10c) of the fixing screw 10, and FIG. As shown in FIG. 5, the first stopper 13 a comes into contact with the receiving portion 11 a at the peripheral portion of the insertion hole 11 of the fixing screw 10 when the fixing screw 10 moves to the fixing release position. Thereby, when the fixing screw 10 moves to the fixing release position, the movement of the fixing screw 10 in the insertion / removal direction is restricted, and the fixing screw 10 falls off from the insertion hole 11 of the fixing screw 10 to the outside side. It is preventing.

  Further, the washer member 14 is disposed around the head 10 a of the fixing screw 10. The washer member 14 is formed with a ring-shaped spring seat groove 14 a that receives one end of the coil spring 15. The coil spring 15 is disposed between the washer member 14 and the inner bottom portion of the recess 9. The head 10 a of the fixing screw 10 is urged toward the outer side of the recess 9 by the coil spring 15. Therefore, as shown in FIG. 1, at the fixed position where the male screw portion 10 b of the fixing screw 10 is screwed into the screw hole 4 of the nut plate 6, the coil spring 15 is held in a contracted and accumulated state. As a result, when the fixing screw 10 is loosened from the fixing position, the fixing screw 10 and the washer member 14 jump up by the tension (elastic return force) at which the contracted coil spring 15 returns to the original shape. At this time, the inner guide 13 is moved in the axial direction by the second stopper 13b of the inner guide 13 being engaged with the terminal portion of the male screw portion 10b of the fixing screw 10. Then, as shown in FIG. 2, the first stopper 13 a of the inner guide 13 abuts on the receiving portion 11 a at the peripheral portion of the insertion hole 11 of the housing cover 2, so that the fixing screw 10 is moved to the fixing release position. It is designed to be held up.

  Further, as shown in FIG. 10, the fixing screw 10 of the present embodiment has a large inclination angle θ of the flare portion 10e between the flat surface 10d of the end face of the head portion 10a and the shaft portion 10c, for example, 120 ° or more. This is a thin screw in which the height of the head 10a is reduced.

(Function)
Next, the operation of the above configuration will be described. In the housing cover structure of the present embodiment, before the housing 1 and the housing cover 2 are assembled as shown in FIG. 8A, the fixing screw 10 of the screw drop-off prevention portion 12 of the housing cover 2 is 2 is held in a flip-up state moved to the fixed release position shown in FIG. Therefore, since the head 10 a of the fixing screw 10 of the screw drop-off prevention portion 12 protrudes outside the recess 9 of the housing cover 2, the male screw portion 10 b at the tip of the fixing screw 10 is inside the housing cover 2. The protruding amount that protrudes can be suppressed to a length that is smaller than the entire length of the fixing screw 10.

  In this state, as shown by an arrow in FIG. 8A, the housing cover 2 is slid downward from the top of the housing 1 and assembled in a state of covering the housing 1. Then, as shown in FIG. 8 (B), the screw of the housing cover 2 is dropped into the screw hole 4 of the fixing portion 5 of the housing 1 while being slid to the position where the housing cover 2 is put on the housing 1. An operation of screwing the fixing screw 10 of the prevention unit 12 is performed. When the fixing screw 10 is screwed in, the fixing screw 10 is pushed together with the washer member 14 toward the inside of the concave portion 9 of the housing cover 2 against the spring force of the coil spring 15 of the screw drop-off prevention portion 12. . Then, as shown in FIG. 1, the male screw portion 10 b at the tip of the fixing screw 10 is screwed into the screw hole 4 of the nut plate 6, whereby the fixing screw 10 is fixed at the fixing position. As a result, as shown in FIG. 8B, the casing 1 is fixed with the casing cover 2 covered. At this time, since the head 10 a of the fixing screw 10 of the screw drop-off prevention part 12 is accommodated in the recess 9 of the housing cover 2, the head 10 a of the fixing screw 10 protrudes outside the housing cover 2. The outer surface of the housing cover 2 can be held in a smooth state.

  When removing the housing 1 from the housing cover 2, the male screw portion 10 b of the fixing screw 10 is removed from the screw hole 4 of the nut plate 6. At this time, when the fixing screw 10 is loosened from the fixing position, the fixing screw 10 and the washer member 14 jump up by the tension (elastic return force) at which the contracted coil spring 15 returns to the original shape. As the fixing screw 10 springs up, the second stopper 13 b of the inner guide 13 is engaged with the terminal portion of the male screw portion 10 b of the fixing screw 10, so that the inner guide 13 is moved in the axial direction together with the fixing screw 10. Then, as shown in FIG. 2, the first stopper 13 a of the inner guide 13 abuts on the receiving portion 11 a at the peripheral portion of the insertion hole 11 of the housing cover 2, so that the fixing screw 10 is moved to the fixing release position. Held in a flipped state. In this state, the casing 1 can be detached from the casing cover 2 as shown in FIG. 8A by sliding the casing cover 2 upwardly above the casing 1.

(effect)
Therefore, the above configuration has the following effects. That is, as shown in FIG. 8A, the housing cover 2 of the present embodiment is a three-surface integrated type that covers the three surfaces of the housing 1 facing left and right two side surfaces 1a and 1b and the upper surface 1c. Since the substantially U-shaped cover body 3 is provided, the number of parts of the housing cover 2 is reduced, which is advantageous in terms of maintainability and cost.

  Further, the housing 1 is provided with a plurality of fixing portions 5 having screw holes 4 for fixing the housing cover 2, and the portion corresponding to the fixing portion 5 in the housing cover 2 is directed to the inside of the housing cover 2. A recess 9 having a size capable of accommodating the head 10a of the fixing screw 10 screwed into the screw hole 4 of the housing 1 is provided. Then, on the inner bottom portion of the recess 9 of the housing cover 2, a fixing position where the male screw portion 10 b of the fixing screw 10 is screwed into the screw hole 4, and the male screw portion 10 b of the fixing screw 10 are removed from the screw hole 4, and the fixing screw A floating structure screw drop-off prevention portion 12 is provided that supports the 10 head portions 10a so as to be movable between a fixed release position in which the head portions 10a protrude outside the concave portion 9. Accordingly, since the protruding amount of the male screw portion 10b at the tip of the fixing screw 10 protruding inside the housing cover 2 is small, the fixing screw 10 is moved when the housing cover 2 is slid and placed on the housing 1. The length of the interference part that interferes with the body 1 can be reduced. Therefore, for example, as shown in FIG. 9, when the housing cover 2 is slid and covered on the housing 1 as in the case where the entire fixing screw 10 protrudes inside the housing cover 2, the fixing screw 10 is attached to the housing 1. It can prevent that the length L of the escape part 21 for preventing interference with the body 1 becomes long. As a result, the dead space formed inside the housing cover 2 can be reduced.

  Further, in the flip-up mechanism 16 of the screw drop prevention portion 12 of the present embodiment, the stroke of the fixing screw 10 is ensured to be twice or more than usual by the action of the inner guide 13. Then, by the jumping mechanism 16 of the high-stroke fixing screw 10, when the fixing screw 10 is fixed (when the coil spring 15 is contracted), the head of the fixing screw 10 is inserted into, for example, the recess 9 having a depth of 3 mm. A very space-saving structure capable of accommodating the portion 10a can be achieved.

  Furthermore, in the present embodiment, as shown in FIG. 10, the fixing screw 10 increases the inclination angle θ of the flare portion 10e between the flat surface 10d of the end face of the head portion 10a and the shaft portion 10c, for example, 120 ° or more. This is a thin screw in which the height of the head 10a is reduced. Therefore, the depth of the concave portion 9 recessed toward the inside of the housing cover 2 can be reduced, which is effective in preventing reduction of the effective space of the housing 1.

  As described above, the present embodiment is excellent in maintainability and cost, and can prevent the reduction of the effective space of the housing 1 even when the housing cover 2 is slid and put on the housing 1. The structure of the cover 2 can be provided.

[Second Embodiment]
(Constitution)
FIG. 11 shows a second embodiment. The present embodiment is a modification in which the configuration of the housing cover structure of the first embodiment (see FIGS. 1 to 10) is changed as follows. That is, in the first embodiment, the nut plate 6 is provided separately from the housing 1 fixed to the chassis 1 d of the housing 1, and the screw hole 4 is formed in the central portion of the plate body 6 a of the nut plate 6. Although the formed configuration is shown, in the present embodiment, instead of this, a screw hole 32 that is screwed into the male screw portion 10b of the fixing screw 10 is directly formed on the wall surface of the main body 31 itself of the housing 1.

(Action / Effect)
Therefore, in addition to the effects similar to those of the first embodiment, the present embodiment can further simplify the configuration of the housing 1 and reduce the number of parts and maintainability. This is more advantageous in terms of cost.

  As described above, the embodiment described above is excellent in maintainability and cost, and can prevent the reduction of the effective space of the housing 1 even when the housing cover 2 is slid onto the housing 1. The structure of the body cover 2 can be provided.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A plurality of fixing portions each provided with a three-sided integrated case cover that covers three surfaces of two opposite side surfaces and the upper surface of the case, and provided with screw holes for fixing the case cover to the case A portion of the housing cover corresponding to the fixing portion of the housing is recessed toward the inside of the housing cover, and a head portion of the fixing screw that is screwed into the screw hole of the housing is provided. A recessed portion having a size that can be accommodated is provided, and a fixing position where the male screw portion of the fixing screw is screwed into the screw hole on the inner bottom portion of the concave portion of the housing cover, and the male screw portion of the fixing screw is extended from the screw hole. A housing cover structure comprising a screw drop-off preventing portion that is detachably supported so as to be movable between a fixing release position in which the head of the fixing screw protrudes outside the concave portion.
[2] The screw drop prevention portion is a cylindrical inner guide that is mounted in an insertion hole of the fixing screw formed in the inner bottom portion of the concave portion of the housing cover so as to be movable in the insertion / removal direction of the fixing screw. One end portion of the inner guide is held movably in the insertion / removal direction of the fixing screw at a portion of the shaft portion between the male screw portion and the head portion of the fixing screw. The other end abuts against the peripheral portion of the insertion hole of the fixing screw when the fixing screw moves to the fixing release position, and prevents the fixing screw from falling out of the fixing screw through the outside. The housing cover structure according to [1], further including a stopper.
[3] The inner guide is fixed so that when the fixing screw moves to the fixing release position, the inner guide engages with a terminal portion of the male screw portion of the fixing screw to restrict movement of the fixing screw in the insertion / removal direction. The housing cover structure according to [2], further including a screw movement restricting portion.
[4] The screw drop-off preventing portion is attached between a washer member arranged around the head of the fixing screw and an inner bottom portion of the recess with the head of the fixing screw facing the outer side of the recess. The housing cover structure according to [1], further including a spring member that biases.
[5] The housing cover structure according to [4], wherein the washer member has a spring seat for fixing one end of the spring member on the inner surface side.
[6] The housing cover structure according to [1], wherein the housing cover is provided with the screw drop-off preventing portion on at least two side surfaces facing the two side surfaces of the housing.
[7] The casing is fixed to the main body of the casing, and at least one of a nut member separate from the casing or a screw hole formed in a wall surface of the main body of the casing itself. The housing cover structure according to [1], wherein the fixing portion is formed.
[8] The fixing screw is a thin screw in which the inclination angle θ of the flare portion between the flat surface of the head end surface and the shaft portion is increased to reduce the height of the head portion. The housing cover structure according to [1].

    DESCRIPTION OF SYMBOLS 1 ... Housing, 1a, 1b ... Side surface, 1c ... Upper surface, 2 ... Housing cover, 4 ... Screw hole, 5 ... Fixing part, 9 ... Recessed part, 10 ... Fixing screw, 10a ... Head, 10b ... Male screw part, 10c ... shaft part, 12 ... screw drop-off prevention part.

Claims (7)

A three-sided housing cover that covers three surfaces of two opposite sides and the upper surface of the housing is provided.
Provide a plurality of fixing portions with screw holes for fixing the casing cover to the casing;
A portion of the housing cover corresponding to the fixing portion of the housing is recessed toward the inside of the housing cover, and a head of a fixing screw that is screwed into the screw hole of the housing can be accommodated. Provided a recess of size,
A fixing position where the male screw portion of the fixing screw is screwed into the screw hole to the inner bottom portion of the concave portion of the housing cover, the male screw portion of the fixing screw is removed from the screw hole, and the head of the fixing screw is removed from the screw hole. set screw disengagement prevention part for movably supported between the unlocking position which projects outwardly of the recess,
The screw drop-off prevention portion has a cylindrical inner guide that is mounted in an insertion hole of the fixing screw formed in an inner bottom portion of the recess of the housing cover so as to be movable in the insertion / removal direction of the fixing screw. ,
One end portion of the inner guide is held in a portion of a shaft portion between the male screw portion and the head portion of the fixing screw so as to be movable in the insertion / removal direction of the fixing screw, and the other end portion of the inner guide is And a stopper that abuts the peripheral portion of the insertion hole of the fixing screw when the fixing screw moves to the fixing release position, and prevents the fixing screw from falling out of the fixing screw through the outside. A housing cover structure characterized by The inner guide engages with a terminal end portion of the male screw portion of the fixing screw and restricts movement of the fixing screw in the insertion / removal direction when the fixing screw moves to the fixing release position. The housing cover structure according to claim 1 , further comprising a restriction portion.   The screw drop-off prevention portion is a spring that urges the head of the fixing screw toward the outer side of the recess between a washer member disposed around the head of the fixing screw and the inner bottom portion of the recess. The housing cover structure according to claim 1, further comprising a member. The case cover structure according to claim 3 , wherein the washer member has a spring seat for fixing one end of the spring member on the inner surface side.   The housing cover structure according to claim 1, wherein the housing cover is provided with the screw drop-off preventing portion on at least two side surfaces facing the two side surfaces of the housing.   The casing is fixed to the main body of the casing, and the fixing portion is at least one of a nut member separate from the casing or a screw hole formed in a wall surface of the main body of the casing itself. The housing cover structure according to claim 1, wherein the housing cover structure is formed.   2. The thin screw in which the inclination angle θ of the flare portion between the flat surface of the head end surface and the shaft portion is increased to reduce the height of the head. The housing cover structure described in 1.

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