CN2938121Y

CN2938121Y - Test pencil

Info

Publication number: CN2938121Y
Application number: CN 200620054269
Authority: CN
Inventors: 辛炎群
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-19
Filing date: 2006-01-19
Publication date: 2007-08-22
Anticipated expiration: 2016-01-19

Abstract

The utility model discloses a test pencil which can also be used as a screwdriver. The utility model is characterized in that the frontispiece of the crust is configured to be a hole site which can hold a light-emitting diode; the light-emitting diode is powered by a battery which is buried in the crust, so that the rays can converge at the frontage of the cutting edge, thus providing lighting in construction operation.

Description

A kind of test pencil

Technical field

Whether charged the utility model belong to a kind of test circuit instrument, relates to a kind of test pencil that uses as screwdriver that has concurrently.

Background technology

Test pencil is widely used in various occasions as the instrument of electrical maintenance circuit, is generally used for circuit or conductor charged testing whether perhaps is used for fixing the parts that adopt screw to connect simultaneously, uses as instrument.In this class application scenario, exist circuit or conductor present position narrow through regular meeting, the insufficient situation of light.Operating personnel need to use simultaneously illumination, just can effectively keep in repair, and this has brought difficulty to maintenance job.Existing test pencil does not possess the effect of illumination.Owing to be provided with blade along the direction of axis, and test pencil is radially also less, is difficult to the light source installing thereon, and the light that light source is sent can converge at the place ahead of blade cutting edge.

The utility model content

Test pencil of the present utility model can provide the light source of illumination simultaneously owing to possess the effect of illumination for maintenance operation, compare with existing test pencil, and have novel features.

The test pencil of the invention also makes full use of the design feature of himself, and the position of light source is set, and light can be concentrated converge at blade cutting edge the place ahead, so that illuminate the position of operation, and shows its creativeness.

Therefore, the purpose of this utility model is to provide a kind of suprastructure characteristics in use of utilizing that light source is set, and light can be concentrated converge at blade cutting edge the place ahead, so that the test pencil that can throw light in constructing operation.

Secondly, the purpose of this utility model also is to provide a kind of above-mentioned test pencil with good enforcement, mounting structure.

Its purpose is realized by following scheme:

A kind of test pencil comprises the measuring head, shell, hand touched electrode and the test circuit that have blade, is characterized in, forms porose in front end is positive on the shell, on this position, hole light emitting diode is housed, and light emitting diode is by the powered battery that is hidden in the shell.Like this, light emitting diode is positioned at the front portion of test pencil shell, during owing to use, people use the rear portion of holding in shell usually, therefore, and in use, light emitting diode can not be subjected in one's hands stopping, in addition, from blade one side, the part that is appeared on the shell has constituted the front, be loaded on positive light emitting diode and also can be subjected to stopping of other parts of shell, so the light that is sent by light emitting diode can illuminate the place ahead of cutting edge, handled easily personnel construction.

In the such scheme, install on the position, hole of light emitting diode, material transparent can be housed.Can play the sealing process of waterproof and dustproof.

For realizing second purpose of the present utility model:

In the such scheme, the position, hole can enlarge, and on this position, hole base is installed, light emitting diode then be loaded on the base.This scheme can be so that housing and mould thereof be made easily, and the assembling of diode is easier.

Be preferably, in the such scheme, converge at the cutting edge place better for making light, the position of base should be formed at the outer surface higher position, make light emitting diode can be with the incident angle that tilts a little near direct projection in cutting edge.

Be preferably, in the such scheme, shell forms reducing in front end, and base is made in the top of front end reducing, can make equally light emitting diode can be with the incident angle that tilts a little near direct projection in cutting edge, light can more approachingly converge at the cutting edge place.

It is desirable to, in the such scheme, base is convexly set in the side of shell, not only can satisfy the incident angle of light emitting diode to tilt a little, its light that sends is near the requirement of direct projection in cutting edge, and the back of base can be used for by so that forefinger or thumb produce thrust forward.

It is desirable to, in the such scheme, the front end of shell forms outstanding part, so that forefinger or thumb can be costed or stick, is convenient to produce thrust forward, can form base on this part, has the effect of finishing both simultaneously concurrently.

Better is in the such scheme, on the outside of shell, in the place ahead of light emitting diode, to be formed with the conduit of logical light vertically.So that the light that light emitting diode sends can converge at blade cutting edge place closer, more, this scheme can be so that base needn't require to make De Taigao or the shell front end shrinks too soon.

Be preferably, in the such scheme, the power supply of light emitting diode is controlled by switch, and this switch also is arranged on the shell.Like this, the user can control as required.

Description of drawings

Fig. 1 is the synoptic diagram of a kind of concrete enforcement structure of the utility model;

Fig. 2 is the structural drawing of the shell of Fig. 1;

Fig. 3 is the structure enlarged drawing of the base of Fig. 1;

Fig. 4 is a kind of concrete enforcement circuit diagram of the test circuit of Fig. 1 test pencil.

Embodiment

Below in conjunction with accompanying drawing the utility model is done concrete detailed description:

With reference to Fig. 1-Fig. 3, the measuring head 1 with excellent conductive performance and mechanical strength properties is moulded casting in insulation crust 2, and measuring head 1 is made into the shape of screw blade, is that screwdriver uses but make the test pencil double as.Shell 2 can be made of plastics, one cavity is arranged in it, the circuit of Fig. 4 can be hidden in wherein, the side of shell has indicator lamp hole 3, LCD M252 display aperture 4, button hole 5, switch hole 6, hand touched electrode hole 7 and base hole 8, so that Fig. 4 circuit is pipe Ne, light emitting diode D1, LCD M252 display screen, button TEST, K switch, hand touched electrode, can be fixed in enclosure and expose, for observe, operation and using.Base 9 is fixed in the base hole 8, the end face of base 9 can form the cap shape of cap 95, its forward position is a breach 91, the back side of base 9 is a cambered surface, this cambered surface has three independently

posts

92,93,94, and two pins of diode can be clamped on middle post 93, and by the post 92,94 of both sides two pins is further limited, shaven head is tending towards forward and level is stretched out, is exposed to breach 91 places; Base hole 8 extends internally in the inner side edge edge, be formed with retaining layer 81, the retaining layer can carry base 9, and can make the end face of base 9 and the housing parts at 8 places, base hole to coincide, it is fluted 811 that retaining layer 81 is axially gone up in the place ahead, and this groove 811 can carry the shaven head 10 of diode, in addition, on the shell, the place ahead of shaven head, be formed with the conduit 21 of logical light vertically.

With reference to Fig. 1 and Fig. 4, circuit is hidden in housings, wherein, end shown in the circuit arrow is drawn towards internally with measuring head 1 and is connected, it is fixing to be pipe Ne and light emitting diode D1 are directed to indicator lamp hole 3, and it is fixing that LCD M252 display screen is directed to LCD M252 display aperture 4, and TEST button, bull switch K are drawn towards button hole 5 respectively, switch hole 6 is fixing, the hand touched electrode is fixed in the hand touched electrode hole 7 of outer casing end, and light emitting diode D2 then is fixed in base 9.

With reference to Fig. 4, the principle of work of this circuit is: if measuring head gets, and the TEST closure will make transistor G1, G2 conducting, thereby make light emitting diode D1 conducting and send light, simultaneously, LCD M252 shows this voltage, in addition according to the pressure drop of resistance with numeral, when this voltage was enough big, also will make was that pipe Ne is luminous.

Test and use are as follows: when K switch was closed, light emitting diode D2 got electric, sends light, can be for the constructing operation illumination.When measuring head contact testee,, show that then testee has forceful electric power if, be that pipe Ne is luminous with finger contact TEST; If simultaneously with the TEST closure, LCD M252 is according to the pressure drop of resistance, and the voltage of testee is shown with numeral.According to this point, can test electrified body and whether have dangerous voltage.When measuring head contact testee,, show that testee does not have forceful electric power if, be that pipe Ne is not luminous with finger contact TEST; If simultaneously with the TEST closure, when light emitting diode D1 sends light, show that testee has induced voltage, and can demonstrate induced voltage from LCD M252, when not sending light, show that testee is not charged as light emitting diode D1.According to this point, can further test electrified body and whether have induced voltage.

According to above-mentioned effect, the circuit of this test pencil also can be used for identification in following occasion: 1, can carry out electrical testing from the insulation course outside of charged object, for example, can test the electric wire position of burying in the wall, so that the decision construction location; 2, can utilize the bright degree of light emitting diode D1 judge the charged wire rod of insulation course zero, live wire, and the breakpoint location of charged wire rod; 3, can also utilize human body charged, by an end of measuring head contact conductor, the other end of a hand contact conductor, another hand is costed the TEST button, judges the break-make of device or wire rod.

Claims

1, a kind of test pencil comprises the measuring head, shell, hand touched electrode and the test circuit that have blade, it is characterized in that, forms porose in front end is positive on the shell, on this position, hole light emitting diode is housed, and light emitting diode is by the powered battery that is hidden in the shell.

2, according to the test pencil of claim 1, it is characterized in that, install on the position, hole of light emitting diode, material transparent also is housed.

According to the test pencil of claim 1 or 2, it is characterized in that 3, the position, hole can enlarge, on this position, hole base is installed, and light emitting diode then be loaded on the base.

According to the test pencil of claim 3, it is characterized in that 4, the position of base is formed at the outer surface higher position, perhaps shell is made in the top of front end reducing in front end formation reducing and base.

According to claim 4 test pencil, it is characterized in that 5, base is convexly set in the outside of shell.

6, according to the test pencil of claim 5, it is characterized in that, the end face of base is the cap shape, its forward position is a breach, and the back side of base is a cambered surface, and this cambered surface has three independently posts, post in the middle of two pins of light emitting diode can be clamped on, and by the post of both sides two pins are further limited, shaven head is tending towards forward and level is stretched out, be exposed to indentation, there.

According to the test pencil of claim 6, it is characterized in that 7, the inner side edge of position, hole is along extending internally, be formed with the retaining layer, retaining layer carrying base, and can make the end face of base and the housing parts at place, position, hole to coincide, and the retaining layer has the groove of carrying light emitting diode on the place ahead is axial.

According to the test pencil of one of claim 1-5, it is characterized in that 8, the front end of shell forms outstanding part, hub end is formed in this part.

9, according to the test pencil of one of claim 1-7, it is characterized in that, on the outside of shell,, be formed with the conduit of logical light vertically in the place ahead of light emitting diode.

According to the test pencil of one of claim 1-9, it is characterized in that 10, the power supply of light emitting diode is controlled by switch, this switch also is arranged on the shell.