Metal working – Means to assemble or disassemble – Means to disassemble electrical device
Reexamination Certificate
1998-09-25
2001-03-20
Young, Lee (Department: 3729)
Metal working
Means to assemble or disassemble
Means to disassemble electrical device
C029S758000, C029S762000, C029S278000, C029S854000, C174S034000, C174S067000
Reexamination Certificate
active
06202294
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to electromagnetic interference/radio frequency interference (EMI/RFI) shield assemblies for circuit boards and, more particularly, to a tool for removing the cover from such a shield assembly to expose the protected circuitry without damaging the shield assembly.
There are numerous applications where electronic circuit components mounted to a printed circuit board must be shielded from electromagnetic interference and/or radio frequency interference. To provide such shielding, metallic shielding assemblies have been developed which cover a group of electronic circuit components mounted to the printed circuit board, with the shield assembly being physically secured in some manner to the printed circuit board while also being grounded thereto. One such shield assembly includes a metallic base and a metallic cover. The base is a rectilinear box having an open side which is secured to the circuit board with the open side adjacent the circuit board, the box enclosing the electronic circuit components. The securing of the box to the circuit board is by using solder to surface mount the box to the board. In order to gain access to the electronic circuit components without removing the shield, the side of the box opposite the circuit board has an enlarged opening therein. This opening is then shielded by the cover, which itself is a metallic rectilinear box having an open side and which fits snugly around the base with the open side of the cover facing the circuit board. When it is desired to gain access to the shielded electronic circuit components, the cover must be removed from the base. In the past, this has presented a problem, since there is no known tool for removing the cover without causing damage to the shield assembly. It would therefore be desirable to provide such a tool.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a tool for removing such a shield cover from the shield base. The inventive tool includes a pair of gripper members each secured to a respective body member. The body members are held together with a slight separation therebetween and are movable toward and away from each other. In use, the tool is placed over the shield cover and the body members are moved toward the circuit board. The body members are then moved toward each other so that the gripper members are under the edges of opposed sides of the cover. The tool is then lifted away from the circuit board, taking the cover with it.
In accordance with an aspect of this invention, a spring is positioned between the body members to resiliently bias them apart.
REFERENCES:
patent: 4461073 (1984-07-01), Harringer et al.
patent: 4858309 (1989-08-01), Korsunsky et al.
patent: 4868975 (1989-09-01), Zaremba et al.
patent: 5502887 (1996-04-01), Gonzales
Davis David L.
Lucent Technologies - Inc.
Tugbang A. Dexter
Young Lee
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