Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – For magnetizing or demagnetizing
Reexamination Certificate
2000-04-10
2001-06-19
Barrera, Ray (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
For magnetizing or demagnetizing
C335S306000
Reexamination Certificate
active
06249199
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a quick magnetizing and demagnetizing device for screwdrivers, which is able to quickly and conveniently demagnetize screwdrivers for use in magnetically sensitive computer equipment or sophisticated instrument. The quick magnetizing and demagnetizing operation also can quickly and conveniently magnetize the screwdrivers for attracting screws.
FIG. 1
shows a conventional screwdriver with magnetism. In the case of fine screw or narrow locking position, an operator can hardly hold the screw with a hand and tighten the screw with a screwdriver. Therefore, during manufacturing, the entire metallic stem
11
or the front end of the metallic stem
11
of the existing screwdriver
10
is generally directly magnetized to form a magnetic section
12
. In use of such screwdriver
10
, the magnetic section
12
is able to attract the screw to facilitate tightening or untightening of the screw. However, after a long period of use or when subject to high temperature or violent shaking, the magnetism of the metallic stem
11
will gradually deteriorate or even disappear. This leads to inconvenience in use of the screwdriver. Also, when applied to computer equipment or sophisticated instrument, the magnetism of a magnetized screwdriver
10
will affect or even damage the computer equipment or sophisticated instrument. Therefore, the screwdriver
10
must be first demagnetized prior to use in the computer equipment or sophisticated instrument.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a quick magnetizing and demagnetizing device for screwdrivers, including two outer casings mated with each other and two sintered magnets received in the outer casings. The quick magnetizing and demagnetizing device is able to quickly and conveniently demagnetize screwdrivers or magnetize the screwdrivers.
It is a further object of the present invention to provide the above quick magnetizing and demagnetizing device in which in cooperation with the resilient expansion of two lateral resilient sides of the outer casings and the inward contraction of the inclined faces thereof, the metallic stems of the screwdrivers with different diameters can be fitted into the screwdriver socket. Therefore, the application range of the quick magnetizing and demagnetizing device is wider.
It is still a further object of the present invention to provide the above quick magnetizing and demagnetizing device in which the two lateral convex resilient sides and the slightly concave demagnetizing faces of the outer casings enable a user to easily hold and operate the quick magnetizing and demagnetizing device.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 3467926 (1969-09-01), Smith
patent: 5502425 (1996-03-01), Tsai
Barrera Ray
Dougherty & Troxell
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