CN2350773Y

CN2350773Y - Safety test pencil

Info

Publication number: CN2350773Y
Application number: CN 98244224
Authority: CN
Inventors: 崔汉东
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-21
Filing date: 1998-09-21
Publication date: 1999-11-24
Anticipated expiration: 2008-09-21

Abstract

The utility model discloses safety test pencil. The utility model can reliably test that whether an object to be tested has electricity and can indicate whether the safety test pencil normally works. The utility model is characterized in that two test circuits which have the same structure is arranged in a handle which is connected with a test contact terminal as a whole, and the two test circuits are isolated by an isolation layer. The utility model comprises a current limiting resistor, a neon tube, a metal spring, an elastic electrode which is contacted by hands, and a pressing cover, wherein, the current limiting resistor and the test contact terminal are in electric connection; the elastic electrode which is contacted by hands directly contacts the metal spring, and the elastic electrode which is contacted by hands is pressed by the pressing cover which is connected with the tail end of the handle through screw threads. When used for test, the utility model can effectively avoid false test for achieving the purpose of safety test.

Description

Safe test pencil

Whether charged the utility model relates to the Electric tester that a kind of instructed voltage exists, especially can test out measured object test pencil reliably.

At present, test pencil commonly used is to be in series by test contact, current-limiting resistance, neon tube, metal spring and hand touched electrode in work and the life.Test contact is contacted with measured object, staff contact hand touched electrode, when measured object has high voltage relative to the earth, the neon tube starter, the expression measured object is charged.But, because extraneous factor or neon tube itself damage (or there are quality problems in other elements that comprise neon tube etc.), both made measured object have high voltage under many situations, neon tube is starter normally, so just cause mistake to survey, be directly connected to staff's life security.

The purpose of this utility model is that a kind of safe test pencil will be provided, and whether it can test out measured object reliably charged, and can indicate whether itself working properly.

The purpose of this utility model be achieved in that with handle that test contact is connected as a single entity in two line structures measurement circuit identical and that separated by separation layer is set.This circuit comprises current-limiting resistance, neon tube, metal spring, elastic force hand touched electrode and the gland that is electrically connected with test contact, and gland is threaded with handle end, and pushes down metal spring by elastic force hand touched electrode, to guarantee excellent contact.When staff was pinned two elastic force hand touched electrode simultaneously measured object is tested, if measured object is charged, the element of two measurement circuits was all intact, then two neon tubes starters simultaneously; If have the neon tube of a circuit to damage or because other reasons causes cisco unity malfunction, the neon tube of another circuit still can indicate the existence of measured object voltage, whether can test out measured object reliably charged, can judge another measurement circuit cisco unity malfunction again, solve mistake survey problem effectively, reached the purpose of safety test.

The utility model has adopted double-circuit structure and elastic force hand touched electrode, and whether charged, staff's personal safety is guaranteed if can reliably test out measured object under the normal condition exactly.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is a longitudinal diagram of the present utility model.

Fig. 3 is the enlarged drawing of elastic force hand touched electrode and gland among Fig. 2.

The utility model has been done following improvement to prior art: with handle (2) that test contact (1) is connected as a single entity in two line structures measurement circuit identical and that separated by separation layer (3) is set.This line construction and prior art are basic identical, be current-limiting resistance (4), neon tube (5), metal spring (6), elastic force hand touched electrode (7) and the gland (8) that is electrically connected with test contact (1) successively, in order to guarantee that each interelement well contacts, be provided with elastic force hand touched electrode (7), it directly contacts with metal spring (6) and is pushed down by the gland (8) that is connected with handle (2) end thread.When staff is pinned two elastic force hand touched electrode (7) when measured object is tested simultaneously, if measured object is charged, neon tube in following two measurement circuits of normal condition is all answered starter, if have only a neon tube starter, illustrate that then the neon tube in another measurement circuit damages (generally can not have the loose contact problem).This product can demonstrate the duty of itself intuitively when test, avoided mistake to survey phenomenon effectively, has reached the purpose of safety test.

Claims

1, a kind of safe test pencil, it is by the current-limiting resistance (4) in handle (2) that is connected as a single entity with test contact (1) and the handle (2), neon tube (5), metal spring (6) and gland (8) are formed, it is characterized in that with handle (2) that test contact (1) is connected as a single entity in two line structures measurement circuit identical and that separated by separation layer (3) is set, this circuit comprises the current-limiting resistance (4) that is electrically connected with test contact (1), neon tube (5), metal spring (6), elastic force hand touched electrode (7) and gland (8), elastic force hand touched electrode (7) directly contacts with metal spring (6) and is pushed down by the gland (8) that is connected with handle (2) end thread.