JPH0135518Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking mechanism for a printed circuit board that is directly mounted in a plug-in type to a connector of a communication device, an electronic device, etc., and prevents the printed circuit board from coming off.

Usually, a plurality of printed circuit boards of this kind are arranged in parallel at predetermined intervals and inserted into the housing from the front of the housing, but it is necessary to lock each printed circuit board to prevent the printed circuit boards from coming out after insertion. In this case, the locking mechanism as a means for preventing the lock from slipping out has conventionally been
As shown in the figure, there is a slidable lock bar 3 having a protrusion 4 for preventing the printed circuit board from coming off, a rail 1 having a groove 2 in which the lock bar 3 slides, and a hole provided at one end of the lock bar 3. A holding member 6 which has an oval hole 7 at a position corresponding to 5 and holds the lock bar 3, and a step-shaped hole 11 which engages with the hole 7 of the holding member 6 and is attached to the holding member 6. a lever 10 which is inserted into the hole 5 of the lock bar 3 through the holes 11 and 7;
and screws 14 for fixing the holding member 6 to the housing frame 15. When the knob 12 of the lever 10 is pressed, the lock bar 3 is pressed in response.
slides in the direction of arrow A, the protrusion 4 moves to the position of the notch corner 16a of the printed circuit board 16, and the printed circuit board 16 is prevented from coming off in the forward direction B. However, such a conventional locking mechanism has a drawback that it requires a large number of man-hours to assemble because it has a large number of parts and requires work such as press-fitting a pin.

The object of the invention is to provide a locking mechanism which eliminates the above-mentioned drawbacks.

For this purpose, the locking mechanism of the present invention includes an L-shaped lock bar with a hole, which has a plurality of notches into which a plurality of printed circuit boards are inserted, and which is movable in a horizontal direction with respect to the front surface of the printed circuit board; a holding member (lock bar guide member) having an L-shaped groove into which the shaped lock bar is inserted, and a stepped notch groove with one end open in the horizontal direction on the front wall surface constituting the L-shaped groove;
A longitudinal groove on the upper and lower surfaces, a hollow clover-shaped protrusion on the axial extension surface of the longitudinal groove, and the hole L on the rear surface.
a slide block having a protrusion that fits into a hole in a shaped lock bar; the protrusion of the slide block fits into the hole of the lock bar inserted into the L-shaped groove of the holding member; and the holding member is stepped. By engaging longitudinal grooves on the upper and lower surfaces of the block with the notch grooves and sliding the block in the horizontal direction, the L-shaped lock bar can be moved and the printed circuit board can be prevented from coming off. be.

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

Fig. 2 is a partially exploded perspective view of a printed circuit board storage casing to which the present invention is applied; Fig. 2 is a perspective view of a printed circuit board locking mechanism according to an embodiment of the present invention, disassembled in the order of assembly. It is. Further, FIG. 4 is a side sectional view taken along line C-C in FIG. 2,
FIG. 5 is a front cross-sectional view taken along the line DD in FIG. 2, showing the state of the printed circuit board when it is locked. As mentioned above, the locking mechanism of the present invention is roughly composed of the lock bar 20, the lock bar holding member (lock bar guide member) 24, and the slide block 29. Each of these parts will be explained in detail.

First, the lock bar 20 is held at the upper front edge of the frame 15 of the housing housing for the printed circuit board 16 so as to be slidable in the lateral direction with respect to the printed circuit board insertion/removal direction (indicated by arrow F in FIG. 2). . lock bar 2
0 is a generally L-shaped elongated member, and a plurality of notches 18 are formed at the lower edge thereof at the same intervals as the arrangement intervals of the printed circuit boards 16. Note that the printed circuit board 16 has a notch at its front upper edge as shown by reference numeral 16a. The lower edge of the lock bar 20 is laterally slidable through this notched corner 16a. The lock bar 20 of this embodiment is also provided with a locking hole 19 as shown in FIG.

The lock bar guide member 24 is connected to the lock bar 2.
An L-shaped groove 21 (FIGS. 3 and 4) is formed so that 0 can be inserted laterally, and the front surface 24
A stepped notch groove 23 with one end open is formed in a. The stepped notch groove 23 has a pair of stepped portions or recessed portions 22, 2 separated by a predetermined distance S on the opening side of the groove.
2' is formed, and the back side thereof is a straight notch groove. This lock bar guide member 24 is held in a fixed position relative to the housing frame.

The slide block 29, as shown in FIG.
A knob 17 is formed on the front surface thereof, and a locking protrusion 27 that fits into the locking hole 19 of the lock bar 20 is formed on the back surface thereof. A pair of guide grooves 25 and 26 are formed between the front and back sides of the slide block 29, and a hollow clover-shaped protrusion 28 is provided at one end of the guide groove to protrude in the direction of extension of the guide groove. ing. This clover-shaped protrusion 28 is formed by bending, for example, a leaf spring, and therefore has some elasticity in the vertical direction.

With this configuration, the lock bar 20 is inserted into the L-shaped groove 21 of the lock bar guide member 24, and the slide block 29 is inserted into the stepped notch groove 23 of the guide member 24 with its guide grooves 25, 26 and clover-shaped protrusion 28. The guide member 2 is fitted so as to fit into the guide member 2.
4, and the locking protrusion 27 on the back surface of the guide member is fitted into the locking hole 19 of the lock bar 20. At this time, the protrusion of the hollow clover-shaped protrusion 28 is inserted into the recessed part 22, 2 of the lock bar guide member 24.
2'. When inserting or removing the printed circuit board 16 (when releasing the lock), slide block 2
9 to slide the block (in this case, the lock bar 20 also slides in the same direction at the same time due to the engagement of the locking hole 19 and the locking protrusion 27), and move the clover-shaped protrusion 28 toward the back. recessed part 2
2', each notch 18 of the lock bar 20 is positioned at the position of each printed circuit board 16, so the printed circuit board 16 can be inserted or removed by passing through these notches 18. can do. Next, when the printed circuit board is inserted,
When the slide block 29 is slid in the opposite direction by operating the knob 17 and the protrusion of the clover-shaped protrusion 28 is engaged with the recess 22 on the opening side, the notch 18 of the lock bar 20 is opened as shown in FIG. Since the position of the printed circuit board 16 deviates from the position of the printed circuit board 16 by the distance S between the recesses 22 and 22', the upper edge of the printed circuit board 16 engages with the lower edge of the lock bar 20, making it impossible to insert or remove it, resulting in a locked state. .

As described above, according to the present invention, it is possible to lock and unlock the printed circuit board very easily just by operating the slide block knob, and it is possible to reduce the number of parts and assembly man-hours, thereby significantly reducing manufacturing costs. It is possible to lower the width.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional printed circuit board locking mechanism, Fig. 2 is a partially cutaway perspective view of a printed circuit board housing case to which the present invention is applied, and Fig. 3 is an exploded perspective view of a conventional printed circuit board locking mechanism. FIG. 4 is a perspective view showing the locking mechanism disassembled in the order of assembly.
5 is a sectional view taken along line C, and FIG. 5 is a sectional view taken along line DD in FIG. 2. 15... Housing frame, 16... Printed circuit board, 18... Notch, 19... Locking hole, 20...
... Lock bar, 22, 22' ... Recessed part, 23
... Stepped notch groove, 24 ... Lock bar guide member, 25, 26 ... Guide groove, 27 ... Locking projection, 28 ... Hollowed clover-shaped projection, 29 ... Slide block.

Claims (1)

[Scope of utility model registration request] A locking mechanism for a printed circuit board that prevents a plurality of printed circuit boards from slipping out of a housing in which the plurality of printed circuit boards are mounted in parallel, the lock mechanism having a plurality of spaced apart notches through which the plurality of printed circuit boards are inserted, and a lock bar that is slidable in the transverse direction with respect to the insertion direction of the board; a lock bar guide member that slidably holds the lock bar and has a stepped notch groove on the front surface; It has a guide groove that engages with the stepped notch groove of the guide member, and a slide block having a hollow clover-shaped protrusion, and after the printed circuit board is inserted, the lock bar is moved by a lateral sliding operation of the slide block. A locking mechanism for a printed circuit board, characterized in that a spaced apart notch is shifted from an insertion position of the printed circuit board to prevent the printed circuit board from coming off.