CN2899201Y

CN2899201Y - Carbon-brush wear controller of electric tool

Info

Publication number: CN2899201Y
Application number: CN 200620100605
Authority: CN
Inventors: 徐伟强
Original assignee: ZHEJIANG CROWN ELECTRIC TOOLS MANUFACTURE CO Ltd
Current assignee: ZHEJIANG CROWN ELECTRIC TOOLS MANUFACTURE CO Ltd
Priority date: 2006-01-18
Filing date: 2006-01-18
Publication date: 2007-05-09
Anticipated expiration: 2016-01-18

Abstract

The utility model belongs to the electric tool field, in particular to a carbon-brush wear controller of electric tool, which comprises a brush handle, a spring, a carbon brush and a copper sheathing, and which is characterized in that the carbon brush is provided with a concave slot without the backward end communicated, a contact rack is arranged on the outside of the brush handle, a fixation splice with a fixation hole is arranged on end side of the contact rack, the upward of the fixation splice is provided with a rack girder extending to the upside of the brush handle, a contact splice of ladder like is extended to the carbon brush forward in the downward of the rack girder, a contact foot in the downward of the contact splice vertically extends to the concave slot of the carbon brush but not touches the concave slot, the upward of the contact splice is arranged with an insertion holder that can connect and insert stator leading line. The equipment can make the electric motor stop automatically when the carbon brush wear to the extreme state, and prompt the operator to change the carbon brush in time, thereby protecting the machine and prolong the life-span of the machine, and widely used to all kinds of electric tool.

Description

Electric tool carbon brush wear control device

Technical field

The utility model belongs to field of power tools, is specifically related to a kind of electric tool carbon brush wear control device.

Background technology

Common non-carbonate limit of wear shutdown unit in the existing electric tool if carbon brush may wear to untimely replacing carbon brush after the limit, can cause the scraping of copper brush pigtail and commutator and cause motor to descend useful life, when serious even the burning machine.

Summary of the invention

At the problems referred to above, the purpose of this utility model provides the electric tool carbon brush wear control device that a kind of operator of making in time changes carbon brush, the effect of playing the protection machine and prolonging the useful life of machine.

The purpose of this utility model realizes as follows: a kind of electric tool carbon brush wear control device, comprise brush carrier, spring, carbon brush and copper sheathing, it is characterized in that carbon brush is provided with the groove that a rear end does not connect, brush carrier is provided with contact bar outward, contact bar one side has a stator that has a fixing hole, the stator upper end has one to extend to setting a roof beam in place of brush carrier top, the end of setting a roof beam in place has one to be folded to toward extension of carbon brush front end and stepped contact chip, the haptic element of contact chip lower end vertically stretches in the groove on the carbon brush but does not touch groove, and the contact chip upper end is provided with the plug base that can patch stator lead.

Because the plug base of copper sheathing and contact bar upper end all inserts the stator lead loop; carbon brush is when normal operating conditions; haptic element and carbon brush on the contact bar are in off-state; the motor operate as normal; wearing and tearing gradually along with carbon brush; carbon brush can move forward under the promotion of spring gradually; when carbon brush wears up to limiting condition; the haptic element of contact chip lower end will contact with the groove walls of carbon brush rear end; make contact bar and copper sheathing be in conducting state, i.e. stator lead loop short circuit, motor will shut down; prompting operation person in time changes carbon brush, thus the effect of playing the protection machine and prolonging the useful life of machine.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the structural representation of the utility model when carbon brush wears up to limiting condition.

Fig. 3 is the structural representation of contact bar of the present utility model (3).

Among the figure: 1 expression brush carrier; 2 expression springs; 3 expression contact bars; 4 expression carbon brush; 5 expression copper sheathings; 6 expression grooves; 7 expressions are set a roof beam in place; 8 expression plug bases; 9 expression contact chips; 10 expression stators; 11 expression haptic elements.

Embodiment

The utility model will be further described below with reference to accompanying drawing and by embodiment.

As Fig. 1, shown in Figure 2, electric tool carbon brush wear control device comprises brush carrier 1, spring 2, carbon brush 4 and copper sheathing 5, the groove 6 that has a rear end not connect on the carbon brush 4, the brush carrier 1 outer contact bar 3 that is provided with, as shown in Figure 3, contact bar 3 one sides have a stator 10 that has a fixing hole, contact bar 3 can be fixed on the electric tool casing by this stator, stator 10 upper ends have one extend to brush carrier top set a roof beam in place 7,7 ends of setting a roof beam in place have one to be folded to toward extension of carbon brush 4 front ends and stepped contact chip 9, the haptic element 11 of contact chip 9 lower ends vertically stretches in the groove 6 on the carbon brush 4 but does not touch groove, and contact chip 9 upper ends are provided with the plug base 8 that can patch stator lead.Because the plug base 8 of copper sheathing 5 and contact bar 3 upper ends all inserts the stator lead loop; when carbon brush 4 during in normal operating conditions; haptic element 11 on the contact bar 3 is in off-state with carbon brush 4; the motor operate as normal; wearing and tearing gradually along with carbon brush 4; carbon brush 4 can move forward under the promotion of spring 2 gradually; when carbon brush 4 wears up to limiting condition; the haptic element 11 of contact chip 9 lower ends will contact with the groove walls of carbon brush 4 rear ends; be that contact bar 3 is in conducting state with copper sheathing 5, make the short circuit of stator lead loop, motor will shut down; prompting operation person in time changes carbon brush, thus the effect of playing the protection machine and prolonging the useful life of machine.

Claims

1. electric tool carbon brush wear control device, comprise brush carrier (1), spring (2), carbon brush (4) and copper sheathing (5), it is characterized in that carbon brush (4) is provided with the groove (6) that a rear end does not connect, the outer contact bar (3) that is provided with of brush carrier (1), contact bar (3) one sides have a stator (10) that has a fixing hole, there are set a roof beam in place (7) that extend to the brush carrier top stator (10) upper end, (7) end of setting a roof beam in place has one to be folded to toward extension of carbon brush (4) front end and stepped contact chip (9), the haptic element (11) of contact chip (9) lower end vertically stretches in the groove (6) on the carbon brush (4) but does not touch groove, and contact chip (9) upper end is provided with the plug base (8) that can patch stator lead.