CN2501058Y

CN2501058Y - Dual-purpose pen for writing and testing electricity

Info

Publication number: CN2501058Y
Application number: CN 01264616
Authority: CN
Inventors: 卢恺南
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-09-04
Filing date: 2001-09-04
Publication date: 2002-07-17
Anticipated expiration: 2011-09-04

Abstract

The utility model relates to a writing and electrical operation used test pencil comprising a test contact, a current-limiting resistance, a neon bulb, a metal spring, a touch electrode and a casing. The test contact is a metal writing pencil. When testing the electricity is needed, the metal writing pencil head contacts the tested metal body and the human body contacts the touch electrode. Users can judge whether the tested metal body is charged or not from the starting of the neon bulb. Meanwhile, the utility model can be used as a writing pencil, which is very convenient.

Description

Write and survey electric double-purpose pen

(1) technical field

The utility model relates to a kind of writing and electrical test pencil.

(2) background technology

Existing test pencil mainly is composed in series by test contact, metal spring, current-limiting resistance, neon tube, hand touched electrode, and places in the cavity of shell.When test contact contacts with tested metallic object, whether when human body contacts with the hand touched electrode, it is charged to test tested metallic object.Patent Office of the People's Republic of China is in " patented claim notice " (patent documentation publishing house, 1990.81 disclose a kind of test pencil of discerning safe or dangerous voltage～86), it is to increase a shunt resistance and identification electrode on above-mentioned existing test pencil, one end of shunt resistance is connected with test contact, and its other end links to each other with the identification electrode.When needing the identification safe or dangerous voltage, catch and touch the identification electrode,, then show adventurous electric shock voltage if neon tube is kept starter; If neon tube puts out brightness, then show it is induced potential.In existing test pencil, test contact is made into the screwdriver shape, make test pencil can double as screwdriver usefulness, and normal and test pencil shell is moulded and is formed one.Because the electrical equipment of people's contact is more and more many, Electrical Safety becomes more important, and for example the student often will contact some electrical equipment when last Physical Experiment, should test again sometimes and write, and is not too convenient.

(3) summary of the invention

The purpose of this utility model is to provide a kind of writing function electric double-purpose pen of examination of writing of being with.

In order to realize the writing function of test pencil, only need to change the test contact in the existing test pencil into the metal lettering pen.When needs examination electricity, metal to be write nib contact with tested metallic object, human body contacts with the hand touched electrode, and promptly whether starter judges whether tested metallic object is charged from neon tube.Can be used as simultaneously lettering pen again and use, very convenient.

(4) description of drawings

Fig. 1 is the structure longitudinal sectional drawing of a kind of embodiment of the utility model.

(5) embodiment

As shown in Figure 1, write the electric double-purpose pen of examination and form, write 5 series connection of test contact 1, current-limiting resistance 2, neon tube 3, metal spring 4, hand touched electrode and place the cylindrical cavity of shell 6 by writing test contact 1, current-limiting resistance 2, neon tube 3, metal spring 4, hand touched electrode 5, shell 6 etc.Writing test contact 1 employing housing is the pen core of metal, for example ball pen, pen etc.Shell 6 can adopt the plastics of good insulating to make, and can be transparent plastic or establishes transparent window 7 at place, neon tube 3 places.

At current-limiting resistance 2 and write between the test contact 1 and can set up another metal spring, to obtain good electrical contact.

In order to increase the service time of lettering pen, the comparable existing lengthening of the length of shell, the cross section increasing of pen core.

In order to keep the function that existing test pencil can be used as screwdriver, test contact can adopt writes test contact and screwdriver-like test contact replacing formula structure, for example establishes helicitic texture etc. at the inner chamber front end of shell 1.

Selected material and technologies such as shell should be by related standards design and manufacturings.

Claims

1, writes the electric double-purpose pen of examination, be provided with test contact, current-limiting resistance, neon tube, metal spring, hand touched electrode, shell, it is characterized in that test contact is the metal lettering pen.

2, the electric double-purpose pen of examination of writing as claimed in claim 1 is characterized in that said metal lettering pen is the pen core of metal shell.

3, the electric double-purpose pen of examination of writing as claimed in claim 1 is characterized in that said metal lettering pen is ball pen or pen.

4, the electric double-purpose pen of examination of writing as claimed in claim 1 is characterized in that at current-limiting resistance and writes and set up metal spring between the test contact.

5, the electric double-purpose pen of examination of writing as claimed in claim 1 is characterized in that test contact is write in the test contact employing and the screwdriver-like test contact is changed the formula structure.