Mechanism for inserting and removing electronic circuit unit

Details Mechanism for inserting and removing electronic circuit unit Mechanism for inserting and removing electronic circuit unit

2002-10-09

2004-04-13

Duong, Hung Van (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C312S223200, C174S034000, C248S534000

Reexamination Certificate

active

06721172

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to mechanisms for inserting and removing electronic circuit units, and more particularly, to a mechanism for inserting and removing electronic circuit units for an electronic device, such as a communication device, an information processing apparatus, and a measurement apparatus, having a shelf where a large number of the electronic circuit units are installed.
2. Description of the Related Art
An electronic circuit unit is installed in a shelf of an electronic device, such as a communication device, an information processing apparatus, and a measurement apparatus. A lever for inserting and removing is rotatably attached to the electronic circuit unit. The electronic circuit unit is connected to a connector on the back board of the shelf by rotating the lever. The electronic circuit unit is locked with the shelf in order to connect the electronic circuit unit to the connector securely, so that a connection for electric signals is accomplished.
FIG. 1
is a view for explaining a conventional mechanism for inserting and removing electronic circuit units.
FIG. 2
is an exploded perspective view of a lever
12
for inserting and removing.
Referring to
FIGS. 1 and 2
, electronic circuit units
10
are mounted on a shelf
20
having a box configuration. The electronic circuit unit
10
includes the levers
12
for inserting and removing, stoppers
13
, and receiving parts
14
. The levers
12
for inserting and removing are rotatably attached to upper and lower parts of the front end part of an electronic circuit board
11
. The stopper
13
is attached to the lever
12
for inserting and removing so as to be rotated by a spring
19
shown in
FIG. 2
, wherein a pin
16
is the center of the rotation of the stopper
13
. The stopper
13
is received by the receiving part
14
. The mechanism for inserting and removing the electronic circuit unit
10
consists of the lever
12
for inserting and removing, the stopper
13
, and the receiving part
14
.
FIG. 3
is a view for explaining an insertion of the electronic circuit unit
10
shown in
FIG. 1
to the shelf
20
and a lock operation. Since the mechanism for inserting and removing provided at an upper part of the front end part of the electronic circuit unit
10
acts substantially the same as the mechanism for inserting and removing provided at a lower part of the front end part of the electronic circuit unit
10
, only the mechanism for inserting and removing provided at the lower part of the front end part of the electronic circuit unit
10
will be described and explanation of the mechanism for inserting and removing provided at the upper part of the front end part of the electronic circuit unit
10
will be omitted.
In a state shown in FIG.
3
-(A), first the electronic circuit unit
10
shown in
FIG. 1
is inserted to the shelf
20
, and then the lever
12
for inserting and removing is rotated counterclockwise. A claw part
15
comes in contact with a frame
21
of the shelf
20
. The lever
12
is rotated counterclockwise based on the leverage. And thereby, the stopper
13
comes in contact with the receiving part
14
.
In a state shown in FIG.
3
-(B), the lever
12
for inserting and removing is further rotated counterclockwise. The stopper
13
is rotated clockwise in a state where the pin
16
is the center of the rotation of the stopper
13
, so that the stopper
13
is situated at an upper part of the receiving part
14
.
In a state shown in FIG.
3
-(C), the lever
12
for inserting and removing is further rotated counterclockwise, so that the electronic circuit unit
10
shown in
FIG. 1
is further inserted to the shelf
20
. The stopper
13
is situated on a concave part
17
of the receiving part
14
, and thereby the stopper
13
is locked with the receiving part
14
. In this case, a gap having a distance y between the right end of the frame
21
and the front end of the electronic circuit board
11
is made.
A surface board is provided to the electronic circuit unit
10
. A shield gasket is provided around the surface board so as to shield against the leakage of an electromagnetic wave to the outside.
Meanwhile, recently, technology has progressed so that signals connected by the connector have a high frequency. Because of this, the length of a contact pin at the connection part of the connector has become short. Hence, it is required to make a secure connection between the connector of the electronic circuit unit and the connector of the back board.
However, the conventional mechanism for inserting and removing electronic circuit unit
10
has problems with regard to the connection of the connector.
First of all, the conventional mechanism for inserting and removing electronic circuit unit
10
has a backlash, namely play with respect to the lock by the lever
12
for inserting and removing. Hence, it is difficult to assure the connection of the connector securely.
That is, in a state shown in FIG.
3
-(C), the stopper
13
is rotated clockwise wherein a pin
16
is the center of the rotation of the stopper
13
, so that the stopper
13
is moved on the concave part
17
of the receiving part
14
. And thereby, a gap having a distance X between a right end of the concave part
17
and the stopper
13
is made. Accordingly, in a state shown in FIG.
3
-(C), if a force for pulling the electronic circuit unit
10
from the shelf
20
due to a vibration, for example, is applied to the electronic circuit unit
10
, that is, if a force is applied to the electronic circuit unit
10
in an opposite direction to the insertion direction of the electronic circuit unit
10
to the shelf
20
(in a right side direction in FIG.
3
-(C)), a state shown in FIG.
3
-(D) occurs. That is, the gap having the distance X between the stopper
13
and the concave part
17
of the receiving part
14
is closed and the gap between the right end of the frame
21
and the front end of the electronic circuit board
11
is increased from the distance y to a distance y+z.
That means, even if the electronic circuit unit
10
shown in
FIG. 1
is inserted to the shelf
20
and the stopper
13
is situated on the concave part
17
of the receiving part
14
so that the stopper
13
is locked with the receiving part
14
as shown in FIG.
3
-(C), backlash, namely play having a distance Z with respect to the lock by the lever
12
occurs in the conventional mechanisms for inserting and removing the electronic circuit unit
10
. Hence, it is difficult to assure the connection of the connector securely in the conventional mechanisms for inserting and removing the electronic circuit unit
10
.
Second, a shield gasket is provided around the surface board of the electronic circuit unit
10
in the vicinity of the lever
12
for inserting and removing, so as to shield leakage of the electromagnetic wave from the electronic circuit unit to the outside. In a case where an attempt is being made to connect the electronic circuit unit
10
to the shelf
20
by the lever
12
for inserting and removing, the electronic circuit unit
10
is at first manually pushed to be inserted. And then, the lever
12
for inserting and removing is rotated counterclockwise to connect the electronic circuit unit
10
to the shelf
20
, as the operator feels a resistant force (an elastic force) against the insertion of the electronic circuit unit
10
, which is caused by the contact to the shield gaskets of neighboring electronic circuit units.
However, the timing when the operator feels the resistant force (the elastic force) does not always coincide with the timing when the lever
12
for inserting and removing should be rotated to connect the electronic circuit unit
10
to the shelf
20
. Hence, the lever
12
for inserting and removing is rotated in error before the electronic circuit unit
10
is positioned to start being connected to the shelf
20
. That is, it is difficult for the operator to determine to start connecting the electronic circuit unit
10
to the sh

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