JPH0451516Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is rotatably supported on a printed circuit board, and is used to attach or detach the printed circuit board in a direction parallel to the board surface using a lever action. This invention relates to a detachable lever for a printed circuit board.

[Background technology and its problems]

As is well known, this printed circuit board attachment/detachment lever is used for a card board (a printed circuit board formed into a card shape of the same size). That is,
A large number of card boards are inserted in parallel into the many guide rails of the board storage section provided in the electronic device, and the connector provided at the tip of each card board is connected to the connector provided on the connection board. It is designed to be inserted into the that time,
The connector has a large number of connection pins,
A large amount of force is required to attach and detach the card board. Therefore, a detachment lever is rotatably supported on each card board so that each card board can be easily attached and detached in a direction parallel to the board surface by utilizing the lever action of the detachment lever.

However, most of the conventional attachment/detachment levers are only for removing the card board.
Not helpful when inserting the card board.

Incidentally, FIG. 1 shows a conventional example of a detachable lever that makes it possible to both remove and insert a card board.

That is, this detachment/detachment lever 1 is approximately T-shaped, and has an end 2 opposite to the direction in which the card board 2 is inserted.
A is rotatably supported around a rotation fulcrum 3. When removing the card board 2 from the guide rail 4 of the board storage section, as shown by the solid line, the lower surface 6a of the short arm 6 on the opposite side of the operating arm 5 of the attachment/detachment lever 1 is attached to the outer periphery of the board storage section. The card board 2 is rotated in the direction of the arrow a by the operating arm 5 while in contact with the edge 7a of the first frame 7, and the card board 2 is easily moved in the direction of the arrow c using the lever action of the lever ratio at that time. Pull it out. Next, when inserting the card board 2 into the guide rail 4, as shown by the one-dot chain line, the upper surface 6b of the short arm 6 of the detachable lever 1 is in contact with the edge 8a of the second frame 8, and the operating arm is 5, the card board 2 is rotated in the direction of the arrow b, and the card board 2 is easily inserted in the direction of the arrow d by utilizing the leverage effect of the lever ratio at that time.

However, in order to implement this conventional example,
A pair of first and second frames 7 and 8 are definitely required, and for example, the first frame 7 can be formed integrally with the outer periphery of the chassis 9, which needs to be provided on the outer periphery of the board storage section. , second frame 8
cannot be formed integrally with the chassis 9, and a separately formed second frame 8 must be screwed to the chassis 9 using a large number of screws 10.

Therefore, the chassis structure becomes complicated, and the number of parts and assembly steps increase, resulting in a significant increase in cost. Furthermore, since the first and second pairs of frames 7 and 8 must be mounted vertically in parallel with a predetermined distance 1 between them, there is wasted space in the vertical direction. There was a space problem when it came to downsizing. Furthermore, during the rotation operation of the attachment/detachment lever 1, the upper and lower surfaces 6a and 6b of the short and small arms 6 touch both frames 7 and 8.
In order to slide the edges 7a, 8a of the frames 7, 8, it is necessary to chamfer the edges 7a, 8a of both frames 7, 8, which also increases the cost. Even if these edges 7a and 8a are chamfered, the upper and lower surfaces 6a and 6b of the short arm 6
Also, it was not possible to prevent the edges 7a and 8a from being worn out, and there was a problem with durability.

[Purpose of invention]

The present invention does not require a pair of first and second frames 7, 8 spaced apart vertically around the outer periphery of the board storage section as in the conventional example shown in Figure 1. It enables both insertion and removal of the printed circuit board by simply providing, for example, the first frame 7 integral with the chassis 9.

[Summary of the idea]

The present invention is a printed circuit board attachment/detachment lever in which the printed circuit board is rotatably supported, and a pair of short and small arms are provided in a bifurcated manner on the side opposite to the operating arm of the rotation fulcrum.

The operation of the present invention constructed in this way will be explained with reference to FIGS. 3 and 4.

First, when removing the card board 22, which is a printed circuit board, from the guide rail 26 of the board storage section,
With the first short arm 17 of the detachable lever 14 in contact with the upper surface 28a of the frame 28 as shown by the dashed line in FIG. 4, the detachable lever 14 is moved to the position shown by the solid line in FIG. Rotate in the direction of arrow a until Then, the card board 22 can be easily pulled out in the direction of the arrow c by using the lever action of the lever ratio at that time.

Next, when inserting the card board 22 into the guide rail 22 of the board storage section, the second short arm 18 of the detachment/detachment lever 14 is brought into contact with the lower surface 28b of the frame 28, as shown by the one-dot chain line in FIG. in a state of
This detachment lever 14 is moved to the fourth position by the operation arm 16.
Rotate in the direction of arrow b to the position shown by the solid line in the figure. Then, using the lever action of the lever ratio at that time, the card board 2 is removed by the detachment lever 14.
2 can be easily inserted in the direction of arrow d.

According to the present invention, which operates in this way, it is possible to use the upper and lower surfaces 28a and 28b of one frame 28 to provide leverage in both directions on the detachable lever 14, unlike the conventional example shown in FIG. A pair of first and second frames 7, 8 are provided on the outer periphery of the board storage section.
There is no need to provide space above and below, just
By providing only one frame 28, both the removal and insertion of printed circuit boards can be performed.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a lever for attaching and detaching a card board will be described with reference to FIGS. 2 to 4.

First, as shown in FIG. 2, the attachment/detachment lever 14 is made of a plastic molded part, and has a pair of first and second levers on the side opposite to the operation arm 16 which is the operation arm part of the rotation fulcrum mounting hole 15. Short and small arms 17 and 18, which are short and small arm portions, are integrally molded in a bifurcated shape. Furthermore, these pair of short and small arms 1
7 and 18 are curved in substantially arcuate directions in opposite directions. As shown in FIG. 4, the lengths (rotational radii) R ₁ and R ₂ of the pair of short and small arms 17 and 18 from the rotation fulcrum 24 are such that the first short and small arm 17 is short and the second short and small arm 18 is long. It is configured. Note that pins 17a and 18a, which are cylindrical portions, are integrally molded at the tips of these short arms 17 and 18, respectively. Further, a substantially C-shaped recess 19 is formed in the opposing portions of both the short and small arms 17 and 18, and the operation arm 1 is connected from the second short and small arm 18.
A slit 20 is formed along the center portion of the lower surface of 6.

This detachment/detachment lever 14 is inserted into an end 22a of a card board (a printed circuit board formed into a card shape of the same size) 22 on the opposite side to the insertion direction through a slit 20, and the end 22
It is rotatably supported by a rotation fulcrum (pin) 24 inserted into the rotation fulcrum attachment hole 15 through a through hole 23 provided in a. In practice, a pair of left and right detachment levers 14 are rotatably attached to both left and right ends of the card board 22, and the card board 22 is attached and detached by the pair of left and right detachment levers 14.

By the way, as shown in FIGS. 3 and 4, the card board 22 is inserted into and attached to the guide rail 26 of the board storage section, and a chassis, which is a casing provided on the outer periphery of the board storage section, is attached to the card board 22. 27
A horizontal frame 28 is integrally provided on the outer peripheral edge of the frame 28 .

Note that the operation of removing and inserting the card board 22 by the detachment/detachment lever 14 was explained in the section of the function of the invention in the above-mentioned [Summary of the invention] section, so a description thereof will be omitted.

Therefore, the detachment lever 14 in this embodiment
As shown in Fig. 4, a pair of short arms 1
Since the lengths R ₁ and R ₂ from the pivot point 24 of 7 and 18 are configured such that the first short arm 17 is short and the second short arm 18 is long, when the card board 22 is removed or inserted, the detachment lever 14 in Figures 3 and 4
The card board 22 can be rotated easily with almost no play within the approximately 90° rotation range shown by the solid line in the figure, and the card board 22 can be easily removed and inserted.

That is, when the insertion/removal lever 14 is rotated approximately 90 degrees in the direction of arrow b from the vertical position shown by the solid line in FIG. 3 to the horizontal position shown by the solid line in FIG. The upper surface 28a of the frame 28 is almost in contact with the upper surface 28a. Therefore, after this, move the attachment/detachment lever 14 approximately in the direction of arrow a from the horizontal position shown by the solid line in FIG. 4 to the vertical position shown by the solid line in FIG.
By rotating the card board 22 by 90 degrees, the card board 22 can be easily removed without any play.

Moreover, at this time, when the detachment lever 14, which has been rotated in the direction of arrow a, becomes vertical as shown by the solid line in FIG. is biased by a relatively large distance S, creating a gap G between the inner end of the frame 28 and the pin 18a of the second short arm 18. Therefore, at this time, when pulling the card board 22 in the direction of arrow c to completely pull it out from the guide rail 26, the short arm 18 will not accidentally come into contact with the frame 28, and the card board 22 will be pulled out completely from the guide rail 26.
can be easily pulled out.

In addition, arrows a and b of the above-mentioned detachment lever 14
When the pins 17a and 18a of both the short arms 17 and 18 are rotated approximately 90 degrees in the direction of the frame 28,
The frame 28 slides on the upper surface 28a, which is the first surface, and the lower surface 28b, which is the second surface, and does not slide on the edges of the frame 28 at all. Therefore, that frame 2
There is no need to wear out the short arms 17, 18 due to the edges of the frame 28, and there is also no need to chamfer the edges of the frame 28.

[Application example]

The present invention is not limited to the attachment/detachment lever of a card board, but can be applied to the attachment/detachment lever of a printed circuit board for various purposes.

[Effect of idea]

Since the present invention is configured as described above, it is possible to perform both operations for removing and inserting printed circuit boards by simply providing one frame integrated with the chassis, for example, on the outer periphery of the board storage section. , the chassis structure is simplified, and the number of parts and assembly man-hours can be reduced, leading to lower costs.
Further, unlike the conventional example shown in FIG. 1, it is not necessary to provide a pair of frames vertically apart from each other, so there is no wasted space in the vertical direction, which is advantageous in terms of space, and miniaturization can be achieved. In addition, as shown in the embodiment, if the pair of short and small arms are curved in a substantially circular arc shape in opposite directions, the ends of these short and small arms will slide on the top and bottom surfaces of the frame during rotation of the attachment/detachment lever. However, these short arms will not be worn out by the edges of the frame. Moreover,
According to the present invention, the first short arm portion and the second short arm portion are curved in substantially arc shapes in opposite directions so that a substantially C-shaped recess is formed in the opposing portions, and the rotation fulcrum is The length from the pivot point to the cylindrical portion integrally molded at the tip of the first arm portion is shorter than the length from the rotation fulcrum to the cylindrical portion integrally molded at the tip of the second short arm portion. Therefore, when removing or inserting a printed circuit board, the ejector lever must be rotated approximately 90 degrees between the vertical position shown by the solid line in Figure 3 and the horizontal position shown by the solid line in Figure 4. It can be rotated easily with almost no play, and has the special effect of allowing easy removal and insertion of printed circuit boards. That is, when the insertion/removal lever is rotated approximately 90 degrees from the vertical position shown by the solid line in FIG. 3 to the horizontal position shown by the solid line in FIG. When the printed circuit board is almost in contact with the first surface of the body and then rotated approximately 90 degrees from the horizontal position shown by the solid line in Figure 4 to the vertical position shown by the solid line in Figure 3, the printed circuit board can be moved easily without any play. can be extracted and the third
As shown in the figure, when the solid line indicates the vertical state, the cylindrical portion at the tip of the second short arm section is displaced inward by a relatively large distance S relative to the cylindrical portion at the tip of the first short arm section. As a result, a gap G is created between the inner end of the housing and the cylindrical part at the tip of the second short arm part, so when pulling out the printed circuit board,
The cylindrical portion at the tip of the second short arm portion does not come into contact with the housing, and can be easily removed.
In addition to the above-described configuration, the cylindrical portions integrally formed at the tips of the first short arm portion and the second short arm portion may slide on the first surface or the second surface of the housing. Since the respective cylindrical parts do not slide on the edges of the housing, there is no wear on the first and second short arm parts due to the edges of the housing, and the edges of the housing are prevented from sliding. A special effect is that there is no need for chamfering at all.
Furthermore, since the first short arm section is made shorter than the second short arm section, there is a special effect in that the area available for the attachment/detachment lever can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view illustrating a conventional example. Second
Figures 4 to 4 show an embodiment in which the present invention is applied to a lever for attaching and removing a card board. Figure 2 is an exploded perspective view, and Figures 3 and 4 are drawings for removing and inserting a card board. FIG. 3 is a front view illustrating the operation. Also, in the symbols used in the drawings, 14...
Detachment lever, 16... Operating arm (operating arm part), 17... First short arm (first short arm part), 17a... Pin (cylindrical part), 18... Second
Short and small arm (second short and small arm part), 18a...pin (cylindrical part), 22...card board (printed board), 24...rotation fulcrum, 26...guide rail, 28...frame, 28a... . . . upper surface (first surface), 28b . . . lower surface (second surface).

Claims (1)

[Scope of Claim for Utility Model Registration] A detachment lever for a printed circuit board that is rotatably supported on a printed circuit board and is adapted to attach or detach the printed circuit board by bringing its point of action into contact with the casing of an electronic device, The detachment/detachment lever includes an operating arm portion to which an external force is applied, a first short arm portion that is provided on the opposite side of the operating arm portion with respect to a pivot point, and has a cylindrical portion integrally formed at the tip of each arm portion; The first short arm portion and the second short arm portion are curved in substantially arc shapes in opposite directions to each other so that a substantially C-shaped recess is formed in the opposing portions thereof. and the length from the rotation fulcrum to the cylindrical portion at the tip of the first short arm portion is shorter than the length from the rotation fulcrum to the cylindrical portion at the tip of the second short arm portion. By applying an external force to the operating arm so that the cylindrical portion at the tip of the first short arm slides on the first upper surface of the casing of the electronic device, the printed circuit board is removed. is pulled out from the housing, and an external force is applied to the operating arm so that the cylindrical portion at the tip of the second short arm slides on a second surface opposite to the first surface of the housing. A detachable lever for a printed circuit board, characterized in that the printed circuit board is housed in the housing by adding the above.