JPH0533033Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a mechanism for preventing a sheet (printed circuit board unit) carrying circuit components of electronic equipment such as a communication device from falling out during operation of the equipment.

[Conventional technology]

Conventionally, various electronic devices of this type have been implemented, and for example, there is one shown in FIG. 7.

FIG. 7 is a perspective view showing a conventional communication device disclosed in Japanese Utility Model Application No. 60-109385.

In FIG. 7, reference numeral 1 denotes a shelf that accommodates a plurality of sheets 2 in line. Guide grooves 3a and 3b are formed in the upper and lower parts of this shelf 1, and a shelf-side connector 4 is attached to the rear of the shelf 1. It is being

The seat 2 is accommodated in the shelf 1 by sliding into the upper and lower guide grooves 3a and 3b, and a seat-side connector 5 corresponding to the shelf-side connector 4 is attached to the rear of the seat 2 for electrical connection. It's summery.

Reference numeral 6 denotes a sheet pulling handle used when pulling out the sheet 2 from the shelf 1 in order to perform maintenance or replacement of the sheet 2. This handle 6 is generally formed by bending a metal round bar, and has a tip end. It has pin 7 on.

A hole 8 (see FIG. 8) into which the pin 7 is inserted is formed in the front part of the seat 2.

In the above configuration, when pulling out the sheet 2 from the shelf 1 for maintenance or replacement of the sheet 2, the pin 7 of the handle 6 is inserted from the side into the hole 8 of the sheet 2 (see FIG. 8), and the handle 6 is removed. When pulled toward you, the seat-side connector 5 is removed from the shelf-side connector 4, and the seat 2 is pulled out from the shelf 1.

[Problem that the invention attempts to solve]

However, the conventional configuration has the following problems.

FIG. 8 shows an example in which a measuring jack is provided at the front of the seat, and this measuring jack 9 is used for maintenance, inspection, etc. performed during operation of the apparatus.

A measuring plug 10 corresponding to the measuring jack 9 has its terminal 10a inserted into the hole 9a of the jack 9, and a measuring device connected via a cable 11 measures predetermined data.

In the case of this data measurement, when the measuring plug 10 is pulled out from the measuring jack 9, the seat 2 is pulled forward, so that the mating between the seat side connector 5 and the shelf side connector 4 shown in FIG. 7 is released. There is a risk that the electrical connection may become unstable, and as a result, it is necessary to hold the front part of the seat 2 with one hand while pulling out the measuring plug 10 with the other hand, which poses a problem of poor operability. Ta.

Further, there was a problem in that the sheet 2 would be pulled out forward not only during data measurement but also during normal operation of the device and due to external vibrations such as earthquakes.

There is a method shown in FIG. 9 as a means for solving these problems.

That is, the cover 1 is placed in the opening of the shield 1.
2 is covered, and a measuring jack 9 is attached to this cover 12.
A square hole 12a for exposing the jack 9 is formed at a position of the cover 12 corresponding to the square hole 12a.

Since the cover 12 is fixed to the opening of the shelf 1 with screws 13, the sheet 2 will not come out even when the measuring plug 10 is pulled out from the measuring jack 9 as shown in FIG.

However, with the above configuration, when sheets are frequently replaced, the cover 12 must be attached and removed each time, and moreover, when a plurality of sheets are stored in the same shelf 1, Even when replacing only one cover 12, the cover 12 must be attached and detached, resulting in poor operability.

Therefore, this invention was devised by focusing on the above-mentioned problem, and its purpose is to prevent the sheets housed in the shelf from being damaged during maintenance or during equipment operation due to external vibrations caused by earthquakes, etc. To provide a mechanism for preventing a sheet from coming off.

[Means for solving problems]

This invention in accordance with the above object includes a lock piece having a lock portion, a mounting hole that allows the movement of the lock piece in the front and rear directions as well as the vertical direction, and a mounting hole that allows the lock piece to be inserted into the mounting hole and placed at the lower front side of the seat. a locking piece attachment means consisting of a fitting to be attached;
It is provided with a locked part that is provided at the lower part of the shelf and removably engages with the locking part of the locking piece.

The mounting tool is a pair of screws provided at the front lower part of the seat, and the mounting hole is an elongated hole and an L-shaped hole arranged in parallel at the rear of the lock piece, or the mounting hole is a pair of screws provided at the front lower part of the seat. are a pair of shafts integrally formed with the lock piece, and the mounting holes are elongated holes and L-shaped holes arranged in parallel at the lower front side of the seat.

[Effect]

In the above configuration, when pulling out the locked sheet from the shelf, first lift the front part of the locking piece and pull it toward you to release the locked state.

Next, the sheet is pulled out using the sheet pull-out handle.

In addition, when storing the seat in a locked state in the shelf, the seat is stored in the shelf while sliding, and when the storage is completed, the lock part of the locking piece engages with the locked part, and the back and forth movement of the seat is prevented. Locked.

This allows the sheets in the shelf to be
Alternatively, the above-mentioned problem can be eliminated since the device will not come off during operation of the device due to external vibrations such as earthquakes.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIG. 1 is a front view showing the sheet slip-off prevention mechanism according to the first embodiment, and FIG. 2 is a sectional view taken along the line -- in FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a shelf of a communication device that accommodates a seat 2, and the seat 2 is attached to this shelf 1 via a guide groove 3a so as to be slidable in the front and rear directions.

At the lower front side of the seat 2, there are two screws 17a having flanges 16a, 16b on the heads.
17b are fixed at regular intervals, and the front screw 17a is set at a slightly higher position than the rear screw 17b.

The means for fixing the screws 17a, 17b to the sheet 2 is as follows: male threaded portions 19a, 19b of the screws 17a, 17b protrude from through holes 18 formed in the sheet 2, and nuts are screwed into the male threaded portions 19a, 19b. 20a, 20b and the shaft portions 21a, 21b, the screws 17a, 17b are attached to the seat 2.
It is becoming fixed.

Reference numeral 22 denotes a lock piece that locks the seat 2 from moving back and forth, and a rectangular lock part 23 is cut out at the lower front part of this lock piece 22, and an elongated hole 24 and an L-shaped irregularly shaped hole 25 are formed at the rear part. has been done.

The elongated hole 24 and the irregularly shaped hole 25 are provided with screws 17a,
The lock piece 22 has a width slightly larger than the diameter of the shaft portions 21a, 21b of the locking member 17b, so that the lock piece 22 can be moved back and forth and up and down by loosely inserting the shaft portions 21a, 21b.

A tapered portion 26 is formed that slopes from the lower end of the left side 23a of the lock portion 23 toward the portion of the irregularly shaped hole 25.

The lower front end of the shelf 1 is formed with a concave portion 28 and a protruding locked portion 29 connected to each other, and the left side 23a of the locking portion 23 of the locking piece 22 comes into contact with this locked portion 29, causing the seat 2 to move forward. is becoming more and more locked.

Next, the operation of the mechanism configured as described above will be explained with reference to FIGS. 3 and 4.

Figure 3 is an explanatory diagram showing the unlocked state;
The figure is an explanatory diagram showing a state of transition to lock.

When pulling out the sheet 2 in the locked state shown in FIG. 1 from the shelf 1, first lift the front part of the locking piece 22 upward and pull it toward you to obtain the unlocked state shown in FIG. 3.

Next, in this unlocked state, the sheet 2 is pulled out using the sheet pull-out handle 6 shown in FIG.

When storing the sheet 2 in the shelf 1 in a locked state, first insert the sheet 2 into the upper and lower guide grooves 3a and slide it.
The tapered portion 26 of the locking piece 22 slides up to the tip of the locked portion 29, and when storage is completed, the locking portion 23 engages with the locked portion 29, ensuring the locked state shown in FIG. 1. be done.

This prevents the sheet 2 inside the shelf 1 from falling out during maintenance or during operation of the apparatus due to external vibrations caused by earthquakes or the like.

FIG. 5 is a sectional view showing the second embodiment, and FIG. 6 is a sectional view showing the third embodiment.

The second and third embodiments have substantially the same construction as the first embodiment, but differ in the lock piece attachment means for attaching the lock piece 22 to the seat 2 so that it can move back and forth and up and down.

That is, the second embodiment uses rivets 30a and 30b as fixtures, and instead of the male threads and nuts of the first embodiment, the tips of the rivets 30a and 30b are caulked and fixed. It is something.

Note that 31a and 31b are the tips of the rivets 30a and 30b that have been deformed by caulking.

Further, in the third embodiment, the lock piece and the fixture are integrally formed, and the lock piece 32 has two shafts 33a and 33b having circular cross sections, which serve as fixtures, integrally molded.

At positions on the seat 2 corresponding to these shafts 33a and 33b, elongated holes 24a and irregularly shaped holes 25a, similar to those in the first embodiment, are formed.

Shafts 33a, 3 are provided at the tips of the shafts 33a, 33b.
E-ring 34 as a locking tool to prevent removal of 3b
is installed.

The operations of the second and third embodiments having the above configuration are substantially the same as those of the first embodiment, so a description thereof will be omitted.

It should be noted that this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made.

For example, in the first embodiment, a lock piece is described in which a tapered part is provided between the lock part and the irregularly shaped hole, but the present invention is not limited to this. It is also possible to store the seat in the shelf with the front part of the sheet raised and then push down the front part of the locking piece to achieve the locked position as shown in FIG.

Further, in the third embodiment, an E-ring is used as the locking device, but the locking device is not limited to this, and a split pin may be used to attach the locking device to the tip of the shaft.

[Effect of idea]

As is clear from the above description, according to this invention, there is provided a lock piece having a lock portion, a mounting hole that allows the lock piece to move in the front-rear direction as well as an up-down direction, and a lock piece that is inserted into the mounting hole. The locking piece is configured to include a locking piece attachment means consisting of a fitting to be attached to the front lower part of the seat, and a locked part provided at the lower part of the shelf and removably engaging with the locking part of the locking piece. Therefore, even if the measuring plug is removed from the measuring jack while the sheet is housed in the shelf, the sheet will not come out and the operation of the equipment will not be hindered.

Of course, the sheet will not come off even if it is subjected to external vibrations such as an earthquake.

Furthermore, since the structure is extremely simple and easy-to-operate locking pieces can be attached to all seats in the shelf, each seat can be operated and maintained reliably, improving the reliability of the entire device. You can get the effect that you can.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the sheet slip-off prevention mechanism according to the first embodiment, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 shows the unlocked state of the first embodiment. An explanatory diagram, FIG. 4 is an explanatory diagram showing the state of transition to lock in the first embodiment, FIG. 5 is a sectional view showing the slippage prevention mechanism of the second embodiment, and FIG. 6 is a diagram showing the third embodiment. 7 is a perspective view showing a conventional example, FIG. 8 is an explanatory view showing problems in the conventional example, and FIG. 9 is an explanatory view showing other problems in the conventional example. be. 1...Sielf, 2...Sheet, 17a, 17
b...Screw, 20a, 20b...Nut, 22...
...Lock piece, 23...Lock part, 24...Elongated hole,
25... Unusual hole, 26... Tapered part, 29... Locked part, 30a, 30b... Rivet, 32...
...Lock piece, 33a, 33b...Shaft, 34...E
ring.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a sheet slipping prevention mechanism that prevents a sheet that is removably stored in the shelf of an electronic device and is electrically connected via a connector from slipping out during operation of the device, a lock portion A lock piece mounting means comprising: a lock piece having a lock piece; a mounting hole that allows the lock piece to move in the front-rear direction as well as an up-down direction; and a fixture that is inserted into the mounting hole and attaches the lock piece to the lower front side of the seat. A mechanism for preventing a sheet from coming off, comprising: a locked part provided at the lower part of the shelf and releasably engaged with a locking part of a locking piece. 2. The mounting device is a pair of screws provided at the front lower part of the seat, and the mounting holes are elongated holes and L-shaped holes arranged in parallel at the rear of the lock piece. A sheet slipping prevention mechanism according to claim 1 of the patent registration claim. 3. A utility model characterized in that the mounting tool is a pair of shafts integrally formed on the lock piece, and the mounting holes are elongated holes and L-shaped holes arranged in parallel at the lower front side of the seat. A sheet slipping prevention mechanism according to registered claim 1.