Pressing type test pencil

Abstract

The present invention provides a pressing type test pencil which comprises an electrical measurement contact, a current limiting resistor, a neon tube and a hand touch electrode which are electrically connected in order in an insulating shell. The hand touch electrode comprises a clamping lock block, a pressing connection rod and a hand contact. The outer side wall of the clamping lock block is provided with clamping ridges in annular space distribution. Two ends of the pressing connection rod are rotatingly connected to the clamping lock block and the hand contact. The inner wall of the insulating shell is provided with ridge shoulders corresponding to the clamping ridges. The front end middle part of the insulating shell is provided with a clamp groove, and the electrical measurement contact stretches into and out of the clamp groove. The outer side wall of the insulating shell is provided with a light hole corresponding to the position of the internal neon tube. A first spring is arranged between the electrical measurement contact and the current limiting resistor. A second spring is arranged between the neon tube and the clamping lock block. The pressing type test pencil has the advantages that the contraction and extension of the electrical measurement contact can be controlled through a pressing mode, the contraction of the sharp electrical measurement contact in a carrying process is assisted, more space is saved in carrying, scratching a carried tool is avoided, and the pressing type test pencil is convenient to use.

Description

technical field [0001] The invention belongs to the field of test pens, in particular to a push-type test pen. Background technique [0002] The test pencil, also called the test pencil, is a commonly used electrical tool for detecting whether the circuit is charged. At present, the conventional structure of the known electric test pen is that the electric contact, the current-limiting resistor, the neon tube and the hand-touch electrode are connected in series; High voltage, when the voltage of the measured object is higher than the ground, the neon tube will light up; when the measured object is not charged, the neon tube will not light up. The specific operation is to touch the electric contactor with the object under test, and touch the hand-touch electrode with human hands to form a test circuit, and then observe whether the neon tube is lit to determine whether the object under test is electrified. However, a part of the electric test contact of the existing electric...

AI Technical Summary

Problems solved by technology

However, a part of the electric test contact of the existing electric test pen is plastic-sealed in the insulating shell, and the electric test contact does not have the function of moving or stretching. Such a test lead needs more space when it is carried, and the electric test contact The head is always exposed during the carrying process, and it is easy to scratch the carrying tools used for carrying, which is inconvenient to carry

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