JP6784048B2 - Electronic circuit board dropout prevention structure - Google Patents

Description

The present invention relates to a fall-prevention member and a fall-prevention structure that prevent an electronic circuit board that is detachably attached and electrically connected and held in a housing from falling off.

There is known a fall-out prevention structure that prevents an electronic circuit board such as a daughter board from coming off from a fitting portion in a housing due to vibration such as an earthquake. For example, Patent Document 1 describes an electric board storage case having a falling-out prevention mechanism so that the electric board does not come off. Patent Document 2 describes that a lock structure is used so that the circuit board package does not fall off. Patent Document 3 describes a printed circuit board holding structure that prevents the printed circuit board from falling off.

Japanese Unexamined Patent Publication No. 7-240588 Japanese Unexamined Patent Publication No. 8-333262 Japanese Unexamined Patent Publication No. 2010-278230

When the electronic circuit board housed in the housing is prevented from falling off from the housing due to vibration, a special dropout prevention member is used to bring the electronic circuit board into contact with the plate end surface of the electronic circuit board. For example, in the conventional technique described in Patent Document 1, a pair of guide holes for sliding a rod-shaped engaging operation portion over a side wall of an opening of an electric board storage case are opposed to both side walls of the opening. It is provided to prevent it from falling off. However, since the guide holes are formed on both side walls of the opening, there is a problem that the storage case itself becomes large and the manufacturing cost for the engaging operation portion and the guide hole increases.

The lock structure of Patent Document 2 and the printed circuit board holding structure described in Patent Document 3 also employ a structure in which the printed circuit board is slid along the plate end surface to hold the plate end surface.

In the printed circuit board holding structure of Patent Document 3, a support plate that supports the printed circuit board, a slit that is drilled at a position facing the printed circuit board of the support plate, and a protrusion that is a stopper that protrudes through the slit are provided. The printed circuit board holding member to have is provided. However, there are still the stopper protrusions when the printed board was taken out, there is a problem that impede insertion or ejection operation of the path Tsu cage. That is, there is a possibility that the printed circuit board or the stopper may be broken when the printed circuit board is taken out. Since the stopper is a small part on the lower side, there is a problem that the printed circuit board or the like is broken when the user tries to forcibly remove the printed circuit board without noticing that the function is to prevent the printed circuit board from falling off.

The present invention has been made in view of the above-mentioned conventional problems, and uses a fall-prevention member capable of realizing a fall-prevention mechanism for an electronic circuit board (hereinafter, also referred to as a package) housed in a housing at low cost. It is an object of the present invention to provide a drop-out prevention structure.

The fall-out prevention structure of the present invention crosses and is fixed to the plate end surface on the front opening side of an electronic circuit board that is inserted through the front opening of the housing and is detachably and electrically connected to the back plate of the housing. It is a fall-prevention structure of an electronic circuit board provided with a fall-prevention member.
The fall-out prevention member is a strip-shaped body, and is provided at both ends of the strip-shaped body and a pair of sliding grooves intersecting in the longitudinal direction of the strip-shaped body and at both ends of each of the sliding grooves. It has a locking part and
Further including a holding means for holding the fall-out prevention member with respect to the edge portion of the front opening of the housing through the sliding groove and the locking portion.
The fall-out prevention member is provided in at least two directions along the sliding groove between a position where the electronic circuit board of the locking portion can be inserted and removed and a position where the electronic circuit board of the locking portion is prevented from falling off. It is characterized by being movable.

According to the present invention, in a fixed structure of an electronic circuit board (hereinafter, also referred to as a package), one screw as a holding means is tightened and loosened, and the fall-prevention member falls off by sliding in at least two directions in the opening plane. It is possible to realize the prevention function and change its cancellation.

FIG. 1 is a schematic plan view showing a part of the dropout prevention member of the first embodiment according to the present invention. FIG. 2 is a schematic exploded perspective view showing a part of the housing and the package of the first embodiment in a package-insertable state. FIG. 3 is a partial side view of the housing and the package of the first embodiment showing how the injector is housed inside the locking groove of the opening edge when the fitting connector and the base connector are fitted. .. FIG. 4 is a schematic perspective view of the package dropout prevention member of the first embodiment. FIG. 5 is a partial side view of the housing and the package of the first embodiment showing how the package dropout prevention member and the injector are buffering when the package is stored and inserted into the housing. FIG. 6 is a schematic plan view showing a part of the package dropout prevention member of the first embodiment. FIG. 7 is a side view of the stepped spacer of the first embodiment. FIG. 8 is a partial side view of the housing and the package of the first embodiment showing the state of the dropout prevention member and the injector when the package is stored and inserted into the housing. FIG. 9 is a schematic exploded perspective view showing a part of the housing and the package of the first embodiment in the package dropout prevention state. FIG. 10 is a partial side view of the housing and the package of the first embodiment in the package dropout prevention state. FIG. 11 is a diagram illustrating a state in which the package dropout prevention member of the first embodiment is in the package insertable / removeable position to the package dropout prevention position. FIG. 12 is a schematic plan view showing a part of the package dropout prevention member of the modified example of the embodiment.

Hereinafter, an example of the dropout prevention member according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following examples. In the examples, the components having substantially the same function and configuration are designated by the same reference numerals, so that duplicate description will be omitted.

FIG. 1 is a schematic exploded perspective view showing a part of the package housing structure of the bookshelf type unit according to the first embodiment of the present invention.

The bookshelf type unit 1 is a rectangular parallelepiped housing having an opening with an open front surface. Side plates 1a are assembled to the left and right of the bookshelf type unit (hereinafter referred to as a housing) 1. However, the left side plate is not shown for clarity.

Behind the opening of the housing 1 closed by the rear plate 2, between the top plate 3 and bottom plate 4 which is held between the left and right side plates 1a, a hollow space for a plurality of packages housing is field constant There is.

A locking recess 6 extending along the edge 5 is formed inside the edge 5 at the upper part of the opening of the housing 1. The locking recess 6 has a "U" -shaped cross section and is formed by opening downward. The edge portion 5 is integrated or fixed to the top plate 3.

A plurality of base connectors 7a connected to each package (not shown) are attached to the back plate 2 side by side in the horizontal direction. The guide 8 that guides the package is formed parallel to the depth direction. The guide 8 is composed of, for example, a linear gap between the punched portions of a plurality of ventilation openings formed by punching sheet metal processing on the top plate 3 and the bottom plate 4. A base connector 7a corresponds to an extension line of each guide 8.

A pair of female screw through holes 9 are screwed at both ends of the edge 5 of the opening of the housing 1. The fall-off prevention member 10 for preventing the package from falling off is fixed by screwing the mounting screws 40a and 40b into the through holes 9 via the first and second irregular shaped holes 11 and 12 of the connecting portions 10b at both ends thereof. The stepped spacer 30 is fixed to the edge 5 by the mounting screw 40a. Mounting screw 40a side of the de-drop preventing member 10 is slidably held by the edge portion 5 via a stepped spacer 30.

FIG. 2 is a schematic exploded perspective view showing a part of the housing 1 and the package PB of the first embodiment in a package-insertable state. In the figure, the fall-off prevention member 10 is held at an open position where the package PB can be inserted and removed from the front inside the housing 1.

The package PB is a rectangular electronic circuit board having a size that can be inserted into the hollow space. A conductive pattern (not shown) and a large number of electronic components are formed on the mounting surface of the package PB. A fitting connector 7b connected to a conductive pattern is provided on one side of the back surface of the package PB. An injector E for insertion / removal is provided at the upper corner of the front side of the package PB.

The package PB is inserted from the fitting connector 7b side through the front of the housing 1 into the inside under the fall-out prevention member 10. When the package PB is housed inside the housing 1, the fitting connector 7b is fitted to the base connector 7a as shown in FIG. 2, and the package PB is electrically connected to the external device.

FIG. 3 is a partial side view showing how the injector E is housed inside the locking recess 6 of the edge portion 5 when the fitting connector is fitted to the base connector when the package is stored.

The injector E is rotatably attached to the upper corner of the plate end surface on the front opening side of the package PB about the rotation shaft Ea. The injector E has a handle portion Eb that projects long from the rotation shaft Ea, and an action portion Ec that projects shortly on the contrary. When the injector E is stored, the handle portion Eb is lowered along the plate end surface on the front opening side of the package PB, and the action portion Ec projects from the plate end surface on the upper portion of the package PB. In the injector E, the free end portion of the handle portion Eb, the rotation shaft Ea, and the action portion Ec have a relationship of a force point, a fulcrum point, and an action point.

FIG. 4 is a schematic perspective view of the dropout prevention member 10 of the first embodiment. The dropout prevention member 10 is a strip-shaped metal plate having a length similar to that of the edge 5 of the opening of the housing 1. The fall-out prevention member 10 is provided with a protruding portion 10c formed by bending the main body 10a at a cross section of approximately 90 degrees from the longitudinal side surface thereof, leaving the portions of the connecting portions 10b at both ends. The strip-shaped body of the main body 10a of the fall-out prevention member 10 has a bent portion 10d having a “he” -shaped cross section that is bent at approximately 0 to 90 degrees on the side opposite to the protruding portion 10c between both ends thereof. .. The main body 10a and the bent portion 10d form a bending angle θ. As described above, the dropout prevention member 10 of the first embodiment has a corner portion A that rises in the same direction as the protruding portion 10c.

If the length of the protruding portion 10c of the dropout prevention member 10 is adjusted, as shown in FIG. 5, when the package PB is stored and inserted in the housing 1, the protruding portion 10c is buffered by the acting portion Ec of the injector E. It can be set so that the fitting connector 7b does not reach the base connector 7a of the housing 1 and the connectors do not come into contact with each other when the connector fitting is not intended. With this protruding portion 10c, half-insertion prevention of the package PB can be achieved.

As shown in FIG. 4, the main body 10a of the dropout prevention member 10 and the left and right connecting portions 10b of the bent portion 10d are provided with first and second deformed holes 11 and 12 penetrating the plate thickness, respectively. As shown in FIG. 6, the first and second irregular holes 11 and 12 are composed of restraint position grooves 15 and 20, release position grooves 16 and 21, and sliding grooves 17 and 22, respectively. The sliding grooves 17 and 22 extend vertically so as to intersect the longitudinal direction of the dropout prevention member 10. The restraint position grooves 15 and 20 and the release position grooves 16 and 21 are screw locking portions, and a pair of parallel locking grooves extending in the same direction parallel to the longitudinal direction from both ends of the sliding grooves 17 and 22. Is. In the first and second irregular holes 11 and 12, the restraint position grooves 15 and 20 and the release position grooves 16 and 21 are bored in parallel and stepwise. The distance L between the center lines of the restraint position grooves 15 and 20 and the release position grooves 16 and 21 is equal. The distance L between the restraint position grooves 15 and 20 and the release position grooves 16 and 21 is such that the longitudinal side surface of the main body 10a intersects the handle portion Eb of the injector E on the plate end surface of the package and the dropout prevention position and the longitudinal side surface of the main body 10a are the package. It is separated by a corresponding distance from the insertable / removable position that does not intersect the handle portion Eb of the injector E on the plate end surface. The distance LL between the center lines of the sliding grooves 17 and 22 is equal to the distance between the centers of the through holes 9 (FIG. 1) of the pair of female screws. Further, the screw position spacing between the restraint position grooves 15 and 20 and the screw position spacing between the release position grooves 16 and 21 are also equal to the center line spacing LL of the sliding grooves 17 and 22. That is, the restraint position grooves 15 and 20 and the release position grooves 16 and 21 are terminated at equal distances from the sliding grooves 17 and 22. The widths of the restraint position groove 12, the release position groove 21, and the sliding groove 22 of the second irregular hole 12 are set to the paddle portion of the mounting screw 40b when the inserted mounting screw 40b (FIG. 1) is loosened. On the other hand, the width is set so that the fall-off prevention member 10 can slide.

FIG. 7 is a side view of the stepped spacer 30 of the first embodiment. The stepped spacer 30 has a shape in which two large and small outer diameter cylinders are coaxially stacked. The step portion 30a having a small outer diameter in contact with the edge portion 5 (FIG. 1) has a step portion length of 30 L and a step portion outer diameter of 30 sD. The widths 15W and 16W of the restraint position groove 15 and the release position groove 16 (FIG. 6) of the dropout prevention member 10 are slightly larger than the step diameter 30sD of the step spacer 30. Further, the step portion length 30L is longer than the plate thickness 10T (FIG. 4) of the dropout prevention member 10. Therefore, the step portion 30a can be fitted into the restraint position groove 15 and the release position groove 16 of the first irregular hole 11. The width 17W of the sliding groove 17 (FIG. 6) of the dropout prevention member 10 is larger than the diameter 30D of the stepped spacer 30. Therefore, the stepped spacer 30 allows the dropout prevention member 10 to slide in the sliding groove 17.

The operation of the first embodiment will be described. As shown in FIG. 8, while turning the handle Eb of the injector E in the direction of the arrow in the figure to make it horizontal, the package PB is made vertical and inserted into the inside from the front opening of the housing 1 along the guide 8. When the fitting connector 7b of the inserted package PB comes into contact with the base connector 7a of the housing 1, the insertion of the package PB is temporarily stopped. After the insertion is stopped, the handle Eb of the injector E is rotated in the direction opposite to the arrow and lowered. The acting portion Ec that has entered the locking recess 6 of the edge portion 5 of the opening comes into contact with the inner side surface of the recess, and the package PB side is pushed into the housing 1 by reaction. In this case, the principle of leverage based on the handle portion Eb and the fulcrum of the action portion Ec works, and the fitting connector 7b can be fitted to the base connector 7a with a slight force. The acting portion Ec is inserted into the locking recess 6 of the edge portion 5, and the acting portion Ec is held in the locking recess 6 (FIG. 3). A plurality of package PBs are arranged in parallel and sequentially stored inside the housing 1 by the same operation procedure.

Next, after the package fitting is completed, the dropout prevention member 10 is changed to the package dropout prevention position.

As shown in FIG. 2, loosen the right mounting screw 40b, and move the fall-out prevention member 10 from the lower stage (release position grooves 16 and 21 in FIG. 6) to the upper stage (FIG. 6) of the first and second irregular holes 11 and 12. Transfer to the groove side of the restraint position grooves 15 and 20) of 6. That is, as shown in FIG. 9, the fall prevention member 10 is slid downward in the plane of the front opening of the housing 1. By transferring the stepped spacer 30 and the mounting screw 40b shown in FIG. 9 to the upper grooves of the first and second deformed holes 11 and 12, as shown in FIG. 10, the main body 10a of the dropout prevention member 10 is an injector. It comes to face the handle portion Eb of E in a wide area. In this state, the mounting screw 40b is tightened to fix the fall prevention member 10. As a result, the main body 10a of the dropout prevention member 10 suppresses the rotation of the injector E while holding the acting portion Ec of the injector E in the locking recess 6.
By suppressing the rotation of the injector E in this way, it is possible to prevent all of the plurality of package PBs housed inside the housing 1 from coming off. As shown in FIG. 10, since the handle portion Eb of the injector E is suppressed by the main body 10a of the dropout prevention member 10, the acting portion Ec is held in the locking recess 6 even if vibration or the like is applied.

The procedure for changing the dropout prevention member 10 to the package dropout prevention position will be described more specifically. FIG. 11 is a diagram showing a time-series state from the state in which the fall-off prevention member 10 is in the package insertion / removal position with respect to the edge portion 5 of the housing to the package drop-out prevention position. The columns of FIGS. 11A to 11E show the appearance in chronological order, and each row shows the left side view of the edge portion 5 and the dropout prevention member 10, the partial front view of only both ends of the dropout prevention member 10, and the edge portion 5 and the dropout prevention member. It is a right side view of 10. At the package insertion / removal position shown in FIG. 11A, the falling-out prevention member 10 has the mounting screw 40a at the release position groove 16 of the first irregular hole 11 and the mounting screw 40b at the release position groove 21 of the second irregular hole 12. It is tightened and fixed in the release position groove). As shown in FIG. 11B, loosen the right mounting screw 40b out of the two screws fixing the fall prevention member 10. The fall prevention member 10 is moved to the left. As shown in FIG. 11C, the fall-off prevention member 10 is lifted from the edge 5 of the housing and slid downward. As shown in FIG. 11D, the fall-off prevention member 10 is lowered to the upper end of the second deformed hole 12 and applied to the mounting screw 40b. As shown in FIG. 11E, the dropout prevention member 10 is shifted to the right (restriction position groove). Then, the mounting screw 40b is tightened (package dropout prevention position). In this way, the fall-off prevention member 10 is slid with respect to the housing 1 so as to draw a "U" shape from below, and the package fall-off prevention state as shown in FIGS. 9 and 10 is obtained.

As described above, according to the present embodiment, the package fixing structure can be changed to realize and release the fall prevention function by tightening and loosening one screw and sliding the fall prevention member. Since there is no obstacle in the position where the package can be inserted / removed when the dropout prevention function is released, the package and the dropout prevention member are not destroyed when the package is inserted / removed. When removing the package, there is a drop-out prevention member at the point where the hand touches, so you will notice that the member is in the state of the drop-out prevention function, and you will not forcibly remove the package and break the drop-off prevention member. Never. With one structure (fall-off prevention member), two functions, a half-insertion prevention function and a fall-off prevention function, can be obtained for all the accommodation packages. Since the function can be changed without removing the screw, the screw and the fall-off prevention member will not fall off. If you use a screw that prevents the screw from falling off, you can prevent the screw from falling off accidentally.

In the above embodiment, the example applied to the housing has been described, but by changing the width and length of the dropout prevention member, it can also be applied to a device having a package and parts that require attachment / detachment. is there. Various packages having different depths (distance x between the main body 10a of FIG. 10 and the handle portion Eb) by setting the angle θ between the main body 10a and the bent portion 10d of the fall prevention member 10 shown in FIG. 4 to an arbitrary bending angle. It can also be applied to built-in devices.

Further, as a modification of the present embodiment, in addition to the sliding groove pattern in which the above-mentioned falling-out prevention member 10 is slid with respect to the housing 1 in a "U" shape, the falling-off prevention member is provided with another sliding groove pattern. It is also possible to slide the 10 so that the package can be inserted and removed and the package can be prevented from falling off.

FIG. 12 is a schematic plan view showing a part of the package dropout prevention member of the modified example of the first embodiment. According to the sliding groove pattern of the fall prevention member 10 shown in FIG. 12A, the fall prevention member 10 slides with respect to the housing 1 so as to draw a shape obtained by inverting the shape of the number "7" from below. Then, it becomes possible to transition from the package insertable state to the package dropout prevention state. According to the sliding groove pattern of the fall prevention member 10 shown in FIG. 12B, the fall prevention member 10 is slid with respect to the housing 1 so as to draw a shape in which the "Z" shape is inverted upside down. , It is possible to transition from the package insertable state to the package dropout prevention state. According to the sliding groove pattern of the fall-out prevention member 10 shown in FIG. 12C, the fall-off prevention member 10 is slid with respect to the housing 1 so as to draw a character shape in which the brackets and brackets are combined. It is possible to transition from the package insertable state to the package dropout prevention state. In the present invention, the sliding grooves 17 and 22 provided at both ends of the sliding grooves 17 and 22 that define the pullout preventable position and the package dropout prevention position of the dropout prevention member 10. It suffices that there are locking portions, that is, restraining position locking portions 15a and 20a and releasing position locking portions 16a and 21a, and the falling-off prevention member 10 is slidable in at least two directions between the locking portions .

1 Housing 2 Back plate 3 Top plate 4 Bottom plate 5 Edge 6 Locking recess 7a Base connector 7b Fitting connector 8 Guide 9 Through hole 10 Falling prevention member 10a Main body 10b Connecting part 10c Protruding part 10d Bending part 11 1st variant Hole 12 2nd irregular hole 15, 20 Suppression position groove 16, 21 Release position groove 17, 22 Sliding groove 30 Stepped spacer PB package E injector

Claims (6)

Injector for insertion and removal is provided in the corner portion of the electronic circuit board, the front opening side of the electronic circuit board which is freely electrically connected detachably to the back plate is inserted through the front opening of the housing the housing It is an electronic circuit board dropout prevention structure provided with a dropout prevention member that intersects and is fixed to the plate end surface of the injector and faces the handle portion of the injector .
The fall-out prevention member is a strip-shaped body, and is provided at both ends of the strip-shaped body and a pair of sliding grooves intersecting in the longitudinal direction of the strip-shaped body and at both ends of each of the sliding grooves. It has a locking part and
Further including a holding means for holding the fall-out prevention member with respect to the edge portion of the front opening of the housing through the sliding groove and the locking portion.
The fall-out prevention member is provided in at least two directions along the sliding groove between a position where the electronic circuit board of the locking portion can be inserted and removed and a position where the electronic circuit board of the locking portion is prevented from falling off. movable der is,
The fall-prevention member has a bent portion bent from a corner of the main body of the fall-prevention member between both ends of the fall-prevention member.
Each of the pair of sliding grooves is provided so as to straddle the corner portion from the main body of the dropout prevention member to the bent portion.
A restraint position groove and a release position groove are provided as the locking portion in each of the sliding grooves with the corner portion interposed therebetween.
When the edge portion of the main body of the dropout prevention member on the opposite side of the bent portion moves from the insertable position by the release position groove to the dropout prevention position by the restraint position groove in the state where the electronic circuit board is connected, A structure for preventing the electronic circuit board from falling off, characterized in that the bending angle of the corner portion is set so as to approach the handle portion of the injector from the plate end surface on the front opening side . Injector for insertion and removal is provided in the corner portion of the electronic circuit board, the front opening side of the electronic circuit board which is freely electrically connected detachably to the back plate is inserted through the front opening of the housing the housing A strip-shaped dropout prevention member that intersects the end surface of the plate and is movably held along the edge of the front opening of the housing and faces the handle of the injector .
It has a pair of sliding grooves that are provided at both ends of the fall prevention member and intersect in the longitudinal direction of the fall prevention member.
Each of the sliding grooves has locking portions provided at both ends of the sliding groove.
The distance between the locking portions is such that the falling prevention position where the longitudinal side surface of the main body of the falling prevention member intersects the plate end surface of the electronic circuit board and the longitudinal side surface of the falling prevention member intersect with the plate end surface of the electronic circuit board. It is separated from the removable position by the corresponding distance ,
The fall-prevention member has a bent portion bent from a corner of the main body of the fall-prevention member between both ends of the fall-prevention member.
Each of the pair of sliding grooves is provided so as to straddle the corner portion from the main body of the dropout prevention member to the bent portion.
A restraint position groove and a release position groove are provided as the locking portion in each of the sliding grooves with the corner portion interposed therebetween.
When the edge portion of the main body of the dropout prevention member on the opposite side of the bent portion moves from the insertable position by the release position groove to the dropout prevention position by the restraint position groove in the state where the electronic circuit board is connected, A fall-out prevention member, characterized in that the bending angle of the corner portion is set so as to approach the handle portion of the injector from the plate end surface on the front opening side . The fall-prevention member according to claim 2, further comprising a protruding portion that is erected from the longitudinal side surface of the fall-prevention member and is bent on the side opposite to the bent portion. The dropout prevention member according to claim 2 or 3 , wherein one of the pair of sliding grooves is wider than the other. The dropout prevention according to any one of claims 2 to 4 , wherein the locking portion is a locking groove extending parallel to the longitudinal direction of the strip from one end of the sliding groove. Element. Any of claims 2 to 4 , wherein the locking portion is a pair of parallel locking grooves extending parallel to the longitudinal direction of the strip from both ends of the sliding groove. The fall-off prevention member according to 1.

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