JP2008311314A - Fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure in which no stress is caused on a nail after a board is fitted on the nail. <P>SOLUTION: In the fixing structure, a case has nails 7 which are disposed on corners formed of the bottom face and the side faces of the case to function as locking portions. The board has at least a pair of cutouts which cowork with the nail 7 to function as a locked portion that fixes the case and the board. The nail 7 has a pair of return-preventing ribs 23a and 23b located to be approximately engaged with the paired cutouts, and a board fixing nail portion 24 which when the nail 7 is inserted in the paired cutouts, comes in contact with an end of the board to push the return-preventing ribs 23a and 23b widthwise to make them ready for engagement with the paired cutouts, and when the nail 7 is pulled out of the paired cutouts, does not come in contact with the end of the board to narrow a gap between the return-preventing ribs 23a and 23b and comes in contact with an end face other than the paired cutouts to help the nail 7 deforming into a shape incapable of engaging with the paired cutouts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixing structure between a substrate and a housing, and more particularly to a fixing structure using claws.

  Various proposals have been made for a fixing structure between a substrate and a housing. In particular, a structure that can be fixed and released without using a tool by using a nail with fewer screws and the like is convenient, and many proposals have been made.

  FIG. 9 is a diagram showing an example of such a structure (see Patent Document 1). In the structure shown in FIG. 9, when the board | substrate 114 is engage | inserted in the recessed part 117 provided in the side surface of the housing | casing, the leaf | plate spring 109a which pushes the board | substrate 114 upward from the bottom face 101a side is provided.

Japanese Utility Model Publication No. 4-119208

  However, in the structure shown in FIG. 9, since stress is always applied to the substrate 114, there is a possibility that the leaf spring 109a loses its elasticity and does not function due to a change in temperature or passage of time. In addition, there is a problem that the weight exceeding the yield point of the material cannot be lifted.

  An object of the present invention is to prevent stress from being generated in the nail after the substrate is fitted. Moreover, it aims at providing the fixing structure applicable also to a large sized apparatus.

  According to one aspect of the present invention, there is provided a fixing structure of a casing having an opening at the top and a plate-like substrate, and the casing is provided at a corner formed by a bottom surface and a side surface of the casing. A claw portion that functions as a locking portion is provided, and the substrate functions as a locked portion that fixes the housing and the substrate in cooperation with the claw portion, and enters at least the inner side toward the back of the substrate. A pair of notch portions, and the claw portion is provided with a pair of return-preventing ribs provided at positions substantially engaging with the pair of notch portions, and when inserted into the pair of notch portions, Abutting against the edge of the substrate, the return-preventing rib is expanded in the width direction so that it can be engaged with the pair of cutout portions. Narrow the expansion of the return-preventing rib without abutting and abut against the end surfaces other than the pair of notches Fixed structure characterized by having a substrate fixing claw portions help deformed so as to engage a condition not to the pair of notches is provided by Rukoto.

  The substrate fixing claw portion is provided on the substrate side of the claw portion, has an inclined surface that approaches the substrate side downward, and can move in a direction opposite to the substrate when the inclined surface is pushed from the substrate side. It is preferable that it is comprised. When the substrate is moved downward, the end portion of the substrate slides while pushing the inclined surface, and pushes the return preventing rib in the width direction.

  It is preferable that the substrate fixing claw portion has a bottom surface provided at a position in contact with the upper surface of the substrate following the inclined surface. Further, the claw portion is a foot portion formed away from the bottom surface of the housing by a distance in the extending direction of one side of the bottom surface, and the substrate fixing claw portion is pressed by the substrate. Further, it may have a foot that tilts by elastic deformation in the direction of the substrate and the direction away from the substrate. The feet may be paired. Furthermore, it may have a substrate receiving rib that is provided at a position that rises from the bottom plate of the housing and faces the bottom surface of the substrate fixing claw portion, and fixes the substrate by abutting the upper surface thereof against the lower surface of the substrate. . The claw portion can be formed as an integral molded product.

  According to the present invention, it is easy to fix / remove the substrate. Long life of the fixed structure. In addition, since there is no need for screwing, there is an advantage that it can be realized at low cost and is friendly to the environment.

  Hereinafter, a fixing structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing one configuration example of the housing side in the fixing structure according to the present embodiment. As shown in FIG. 1, the fixing structure according to the present embodiment includes a housing 1, a claw portion 7 provided at a corner between the bottom surface 1 a and the side surface of the housing 1, and a substrate holding portion 5. is doing. FIG. 2 is a diagram showing a substrate 11 that is a target fixed to the housing 1 in addition to the housing 1 shown in FIG. 1. The substrate 11 has substantially the same size as the housing 1 and is provided with various electronic components 11a. When the casing 1 and the substrate 11 are fixed, they are brought closer to each other as indicated by reference numeral L1.

  FIG. 3 is a diagram illustrating a detailed configuration example of the claw portion 7. FIG. 3A is a diagram illustrating an external configuration example in a stationary state (a state in which no force is applied). As shown in FIG. 3A, the claw portion 7 has two foot portions 27a and 27b formed on the bottom plate 1a so as to be separated from each other by a certain distance. The foot portions 27a and 27b are provided in the vicinity of the side portion of the bottom plate 1a, are formed to be long in the direction along the side portion and short in the direction perpendicular to the side portion, and are formed of an elastic member such as plastic. Thus, it can be inclined in a direction perpendicular to the side portion.

  The foot portions 27a and 27b are connected to each other by a connecting portion 21 that is parallel to the side portion. Near the center of the connecting portion 21 in the side direction, there is provided a board fixing claw portion 24 having a certain width and capable of being inclined by elastic deformation in a direction perpendicular thereto. The substrate fixing claw portion 24 has an inclined surface 25 having an inclination toward the opposite side to the side portion on the opposite side to the side portion in a stationary state, and a slightly wider bottom surface 25a on the lower side. Have.

  A substrate receiving rib 29 is provided below the substrate fixing claw 24 at a certain distance from the bottom surface 1a to the bottom of the bottom surface 25a. When the substrate is fixed, the substrate receiving rib 29 is supported by the upper surface of the substrate receiving rib 29 and has a positioning function in the height direction.

  Further, return-preventing ribs 23a and 23b projecting in a direction substantially perpendicular to the side portions are provided at both end portions of the upper portions of the foot portions 27a and 27b, respectively. The detailed structure of the return prevention ribs 23a and 23b will be described later. The claw portion 7 can be manufactured as an integrally molded product.

  As shown in FIG. 3B, when the inclined surface 25 is pressed, the substrate fixing claw portion 24 is rotated (tilted) in the direction of L2 (side direction).

  Further, as shown in FIGS. 4A and 4B, the substrate 11 is provided with notches 31a and 31b, and the inclination of the notch surfaces of the return preventing ribs 23a and 23b. It almost coincides with the inward tilt angle. However, the angle of the inclined surfaces of the return preventing ribs 23 a and 23 b is changed depending on the position of the substrate fixing claw portion 24. When the substrate fixing claw portion 24 is pushed, the return preventing ribs 23a and 23b spread in the lateral direction and can be inserted into the cutout portions 31a and 31b. When inserted at one end, as shown in FIGS. 4A and 4B, even if the position of the substrate fixing claw 24 changes, the return preventing ribs 23a and 23b work in the direction of spreading from the inside. (L4, L3), the return prevention ribs 23a, 23b are prevented from being detached from the cutout portions 31a, 31b. Accordingly, the substrate 11 is firmly fixed to the housing 1. The return preventing ribs 23a and 23b and the cutout portions 31a and 31b need only be locked even if they are not completely fitted at the fixed position. There is also an advantage that does not deteriorate.

  In addition, the lower surface of the substrate 11 is in contact with the upper surface of the substrate receiving rib 29 for holding the vertical position of the substrate 11 in the fixed position by the substrate receiving rib 29 that is arbitrarily provided. 11 is held more stably.

  FIG. 5 is a diagram illustrating the locking operation of the claw portion 7 with the substrate 11. As shown in FIG. 5, the substrate 11 is gradually moved downward from above the housing 1. Here, the return prevention ribs 23a and 23b are moved downward at positions where the cutout portions 31a and 31b are engaged. Then, the inclined surface 25 of the substrate fixing claw portion 24 comes into contact with the end surface of the substrate 11. When the substrate 11 is further moved downward, the inclined surface 25 of the substrate fixing claw 24 is pressed by the end surface of the substrate 11 and is pushed to the opposite side of the substrate surface while rotating around the base point by elastic deformation. Eventually, the end surface of the substrate 11 comes off from the inclined surface 25 of the substrate fixing claw portion 24, and as shown in FIG. 6, the substrate fixing claw portion 24 elastically returns and returns in the direction L5, and its bottom surface 25a is the substrate. 11 is slid on the upper surface, and rests in a state where it is completely elastically restored. This state is the same in the other claw portions 7, and a fixing structure between the housing 1 and the substrate 11 is formed. In this fixing structure, since there is almost no stress applied to the fixing portions (return prevention ribs 23a and 23b and notches (31a and 31b)), stable fixing can be performed and the life of the fixing structure can be extended.

  Next, an operation for releasing the fixation between the housing 1 and the substrate 11 will be described with reference to FIGS. 7 (A) and 7 (B). When the inclined portion 25 of the substrate fixing claw portion 24 is pushed outward from the state shown in FIG. 6A (L8) as shown in FIG. 7A, the bottom surface 25a and the substrate upper surface 11a slide while preventing slipping. The ribs 23a and 23b and the cutout portions 31a and 31b move while sliding in the releasing direction while being engaged. At this time, a force in the direction spreading outward acts on the return preventing ribs 23a and 23b as indicated by reference numerals L6 and L7.

  Then, as shown in FIG. 7B, when the engagement between the return prevention ribs 23a and 23b and the cutout portions 31a and 31b is completely released, the return prevention that has been spread laterally until then. As long as the ribs 23a and 23b are elastically restored in the direction in which the width is reduced and the substrate fixing claw portion 24 is not pushed, the tip portions 23a-1 and 23b-1 of the return preventing ribs 23a and 23b and the end surfaces 21a and 21b of the substrate are It abuts (reference P1) and is configured so that the return prevention ribs 23a and 23b cannot be inserted into the cutout portions 31a and 31b. Therefore, unless the operation of moving the substrate 11 from the upper side to the lower side again is performed, the substrate 11 is not easily engaged, so that it is not caught when the substrate is pulled out and is easily pulled out.

  FIG. 8A is a diagram showing a state immediately before the substrate 11 is fitted to the entire housing 1, and FIG. 8B is an overall view showing a completely fitted state. In the state of FIG. 8 (B), when the claw portions 7 are removed by pushing the inclined surfaces 25 of the individual substrate fixing claw portions 24, the above-mentioned return preventing mechanism again until all the claw portions 7 are removed. It is convenient because it can be easily removed, for example, with one hand in order without being fitted.

  As described above, according to the fixing structure of the present embodiment, the substrate can be easily fixed / removed. In addition, since there is no need for screwing, there is an advantage that it can be realized at low cost and is friendly to the environment.

  In the above description, the projector has been described as an example. However, in addition to the projector, it can be used as a fixing structure for many electronic devices such as a liquid crystal television receiver and a personal computer, and an optical device. .

  The present invention can be used as a fixing structure of an electronic device.

It is a perspective view which shows one structural example of the housing | casing side among the fixing structures by this Embodiment. It is a figure which shows the board | substrate which is the object fixed to this housing | casing in addition to the housing | casing 1 shown in FIG. It is a figure which shows the detailed structural example of a nail | claw part. It is a figure which shows the relationship between a notch part and a return prevention rib. It is a figure which shows the operation | movement which a nail | claw part latches with a board | substrate. It is a figure following FIG. It is a figure which shows the operation | movement which cancels | releases fixation of a housing | casing and a board | substrate from the state of FIG. It is a figure which shows the operation | movement which cancels | releases fixation of a housing | casing and a board | substrate from the state of FIG. It is a figure which shows a mode that a board | substrate fits with respect to the whole housing | casing. It is a figure which shows an example of the fixing structure described in patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... Bottom surface, 5 ... Substrate holding part, 7 ... Claw part, 11 ... Substrate, 11a ... Substrate upper surface, 27a, 27b ... Leg part, 21 ... Connection part, 24 ... Substrate fixing claw part, 25 ... Inclined surface, 25a ... bottom surface, 29 ... substrate receiving rib, 23a, 23b ... return preventing rib.

Claims (6)

It is a fixing structure between a housing having an opening at the top and a plate-like substrate,
The housing is provided with a claw portion that is provided at a corner portion formed by the bottom surface and the side surface of the housing and functions as a locking portion,
The substrate functions as a locked portion that fixes the housing and the substrate in cooperation with the claw portion, and has at least a pair of cutout portions that enter the inside toward the back of the substrate,
The claw portions are in contact with a pair of return preventing ribs provided at positions that substantially engage with the pair of cutout portions, and when they are inserted into the pair of cutout portions, The return-preventing ribs are spread in the width direction so that they can be engaged with the pair of cutout portions, and the return-prevention ribs are not brought into contact with the end portions of the substrate when extracted from the pair of cutout portions. A board fixing claw portion that assists in deformation so as to be in a state where it cannot be engaged with the pair of notch portions by narrowing the spread of the plate and abutting against end faces other than the pair of notch portions. Construction.   The substrate fixing claw portion is provided on the substrate side of the claw portion, has an inclined surface that approaches the substrate side downward, and can be moved in a direction opposite to the substrate when the inclined surface is pressed from the substrate side. The fixing structure according to claim 1, wherein the fixing structure is configured.   The fixing structure according to claim 2, wherein the substrate fixing claw portion has a bottom surface provided at a position in contact with the upper surface of the substrate when the housing and the substrate are fixed, following the inclined surface.   Further, the claw portion is a foot portion formed away from the bottom surface of the housing by a distance in the extending direction of one side of the bottom surface, and the substrate fixing claw portion is pressed by the substrate. The fixing structure according to any one of claims 1 to 3, further comprising a foot portion that is tilted by elastic deformation toward a direction of the substrate and a direction away from the substrate.   Further, the substrate receiving rib is provided at a position that rises from the bottom plate of the housing and faces the bottom surface of the substrate fixing claw portion, and has an upper surface that contacts the lower surface of the substrate to fix the substrate from below. The fixing structure according to any one of claims 1 to 4.   The fixing structure according to any one of claims 1 to 5, wherein the claw portion is an integrally molded product.

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