CN100495615C

CN100495615C - Switch of electric tool

Info

Publication number: CN100495615C
Application number: CNB2006100766552A
Authority: CN
Inventors: 储云跃
Original assignee: CHANGZHOU YUNJIE ELECTRIC Co Ltd
Current assignee: CHANGZHOU YUNJIE ELECTRIC Co Ltd
Priority date: 2006-04-28
Filing date: 2006-04-28
Publication date: 2009-06-03
Anticipated expiration: 2026-04-28
Also published as: CN101064225A

Abstract

The invention discloses an electromotion tool switch that comprises shell and a switch one end of which extends out of the shell, the first, the second, the third static contactor are set at the bottom of the shell, besides, the forth static contactor is set in the shell; the shell possesses landscape orientation channel, said switch arm is set in the channel, the first dynamic contactor which is contacted with the first static contactor is set on bottom of the switch arm, the turn part of the first static contactor which is at side of the switch arm is connected with the second and the third dynamic contactor which are corresponding with the second and the third static contactor, boss id set on the side surface of the switch arm, during the movement of the switch, the first dynamic contactor is contacted with the second and the third static contactor, synchronously, the switch arm can control the contact between the second and the third dynamic contactor and the corresponding second and the third static contactor. The switch possesses two independent loops, and it is two-contactor contact, it can branch off, and decreases the radiation, the reliability of switch is good, the service life is extended.

Description

Electric tool switch

Technical field

The present invention relates to a kind of electric switch, specifically is a kind of two circuit electric tool switch that has.

Background technology

Electric tool switch in the market all is single-circuit, single-circuit switch is during in the course of the work by big electric current, immediate current in switching is very big, very strong electric spark can appear between the switch contact, the switch contact point is caused bigger galvanic corrosion phenomenon, make contact point aging and switch is damaged at last.In addition, single-circuit switch electric current in the energising course of work is bigger, when big electric current can cause the contact chip heating of switch during by switch, heat transferred causes the temperature of plastic support thing to raise to the plastic support thing that contacts with contact chip, and the plastic support thing is will Yin Wendu too high and be out of shape after temperature is raised to a certain degree, thereby cause the contact chip displacement, make switch failure, not only shortened the useful life of switch, also have potential safety hazard.

Summary of the invention

The electric tool switch that the purpose of this invention is to provide a kind of safe and reliable, long service life.

The technical scheme that realizes the object of the invention is: a kind of electric tool switch, comprise that a housing and an end stretch out the switch arm of housing, vertically be provided with first static contact, second static contact, the 3rd static contact on the bottom surface in the housing, in addition, also be provided with the 4th static contact in the housing, an end of the 4th static contact stretches out outside the housing; Be provided with interconnection in the housing, described above-mentioned switch arm is arranged in this passage, the switch arm bottom is provided with first movable contact spring that often contacts with first static contact, being on the first static contact return portion of switch arm side laterally, lever is connected with corresponding second static contact respectively, second movable contact spring of the 3rd static contact, the 3rd movable contact spring, the side of switch arm is provided with boss, switch arm is in moving, first movable contact spring priority and second static contact, the contact of the 3rd static contact, synchronously, switch arm can successively be controlled second movable contact spring by boss, the 3rd movable contact spring and the second corresponding static contact, the contact of the 3rd static contact.

Described boss on the above-mentioned switch arm side is an angle square shape.

Above-mentioned switch arm comprises the spring in matrix and the insertion matrix chamber, and the outer end of spring is against on the sidewall of housing.

Above-mentioned all movable contact springs all are elastic contact blade.

Be connected for guiding between above-mentioned switch arm and housing interconnection bottom surface.

Above-mentioned switch arm is connected with guiding between the housing interconnection to be taked to establish rail groove on the interconnection bottom surface, the bottom surface of switch arm is provided with and the corresponding gib block of above-mentioned rail groove, and switch arm is connected with the housing bottom surface with the cooperation of described rail groove by gib block and moves in passage along described rail groove.

The present invention has positive effect: because this electric tool switch has fully independently two loops, i.e. major loop, a standby subsidiary loop, with respect to single loop switch commonly used at present, even having a loop to damage lost efficacy, also do not influence the another one loop, switch also can operate as normal, thereby this double loop switch has very high reliability.Switch is during in the course of the work by big electric current; with respect to single-circuit switch; this double loop switch is two contact contacts, has shunting action, and is less relatively by electric current on each contact; reduced the galvanic corrosion of switch contact point; protect contact, reduced the heating of contact chip simultaneously, reduced the possibility of the supporter temperature distortion of contact chip; the security reliability of switch is better, has prolonged the useful life of switch.

Description of drawings

Fig. 1 is the structural representation of switch of the present invention;

Fig. 2 is that the A of switch arm among Fig. 1 is to view;

Fig. 3 is the rearview of switch arm among Fig. 1;

Fig. 4 is the structural representation of first static contact and second movable contact spring that is connected with first static contact, the 3rd movable contact spring;

Fig. 5 is the structural representation of second static contact;

Fig. 6 is the structural representation of the 3rd static contact;

Fig. 7 is the structural representation of the 4th static contact;

Fig. 8 is the structural representation of switch arm a kind of state of switch in motion process;

Fig. 9 is the circuit diagram of switch of the present invention under off-state;

Figure 10 is the circuit diagram of switch arm a kind of state of switch in moving process;

Figure 11 is the circuit diagram of switch arm another kind of state of switch in moving process.

Embodiment

See Fig. 1 to Fig. 7, this electric tool switch comprises that a housing 5 and an end stretch out the switch arm 6 of housing 5, vertically be provided with first static contact 1, second static contact 2, the 3rd static contact 3 (seeing Fig. 4,5,6 respectively) on the interior diapire of housing 5, the wire connecting ends of first static contact 1 and the 3rd static contact 3 is all stretched out outside the housing 5 and first static contact 1 is connected with power cathode; In addition, also be provided with the 4th static contact 4 (see figure 7)s in the housing 5, the 4th static contact is connected with positive source, and an end of the 4th static contact 4 stretches out outside the housing 5.Be provided with interconnection 5-1 in the housing 5, described switch arm 6 is arranged among this passage 5-1, switch arm 6 comprises the spring 6-3 in matrix 6-2 and the insertion matrix chamber, the outer end of spring 6-3 is against on the madial wall of housing 5, on the side of described switch arm 6 and be in second movable contact spring 12, the 3rd movable contact spring 13 tops are provided with angle square shape boss 6-1, angle square shape boss 6-1 is made up of leptoprosopy part 6-1-1 and wide face portion 6-1-2, corresponding second movable contact spring 12 of leptoprosopy part 6-1-1, corresponding the 3rd movable contact spring 13 of wide face portion 6-1-2, switch arm 6 bottoms are provided with first movable contact spring, 11, the first movable contact springs 11 that often contact with first static contact 1 and realize that by spring 6-4 elasticity connects.

Be connected for guiding between above-mentioned switch arm 6 and housing 5 interconnection 5-1 bottom surfaces, interconnection 5-1 establishes rail groove 5-2 on the bottom surface, the bottom surface of switch arm 6 is provided with the corresponding gib block 6-5 with above-mentioned rail groove 5-2, and switch arm 6 is connected with the housing bottom surface by gib block and the cooperation of rail groove and moves in passage 5-1 along the rail groove.Being on first static contact, 1 return portion of switch arm 6 sides laterally, lever is connected with corresponding second static contact 2, second movable contact spring 12 of the 3rd static contact 3, the 3rd movable contact spring 13 respectively, second movable contact spring 12 realizes that by spring 12-1 (not drawing among the figure) elasticity connects, the 3rd movable contact spring 13 realizes that by spring 13-1 elasticity connects, and promptly above-mentioned all movable contact springs all are elastic contact blade.

See Fig. 1, Fig. 8～Figure 11, when not having external force to be applied on the switch arm 6, switch arm 6 pushes up laterally under the elastic force of spring 6-3, and this moment, whole switch was in off-state, and circuit theory diagrams are seen shown in Figure 9.When using, there is external force to be applied on the switch arm 6, switch arm 6 moves in housing 5 along interconnection 5-1 under external force, first movable contact spring 11 of switch arm 6 drives simultaneously moves: when the front end of first movable contact spring 11 contacts with second static contact 2, the boss leptoprosopy part 6-1-1 of switch arm 6 eliminates the compressing to second movable contact spring 12, second movable contact spring 12 is pressed in downwards on second static contact 2 at its contact under the effect of its spring 12-1 (not drawing), make second movable contact spring 12 and corresponding second static contact, 2 contacts, this moment, this switch promptly formed two path conductings, as shown in figure 10; When first movable contact spring 11 continues with switch arm 6 when the effect lower edge of external force interconnection 5-1 is mobile in housing 5, the front end of first movable contact spring 11 contacts with the 3rd static contact 3, meanwhile, the wide face portion 6-1-2 of boss on described switch arm 6 sides eliminates the compressing to the 3rd movable contact spring 13, the 3rd movable contact spring 13 is pressed in downwards on the 3rd static contact 3 at contact under the effect of its spring 13-1, make the 3rd movable contact spring 13 and corresponding the 3rd static contact 3 contacts, this moment, switch promptly formed two other path conducting, as shown in figure 11, at this moment second movable contact spring 12 still connects with corresponding second static contact 2 under spring action, but because there is impedance in mosfet transistor Q1, second movable contact spring 12 and transistor Q1 place path are equivalent to be in off-state, electric current fully from two paths at the 3rd static contact 3 places flow through and this moment electric current reach maximum.

In the process that switch arm 6 moves in housing 5 under external force, when moving, regulates by switch arm 6 the variable resistor unit on the control circuit 14, regulate the duty ratio of control circuit 14 output currents, thereby the ON time of control mosfet transistor Q1, ON time by control Q1 is come the effective value of oxide-semiconductor control transistors Q1 output direct current, thus the control load rotating speed of motor.Between output switching terminal and load motor, also be provided with reversing arrangement 15, in order to the positive and negative rotation direction of control load motor.

When the external force on being applied to switch arm 6 removed, switch arm 6 moved outside housing 5 at the elastic force lower edge of spring 6-3 interconnection 5-1, reverse repetition said process.

Claims

1, a kind of electric tool switch, comprise that a housing (5) and an end stretch out the switch arm (6) of housing (5), it is characterized in that: vertically be provided with first static contact (1), second static contact (2), the 3rd static contact (3) on the bottom surface in the housing (5), in addition, also be provided with the 4th static contact (4) in the housing (5); Be provided with interconnection (5-1) in the housing (5), described switch arm (6) is arranged in this passage (5-1), switch arm (6) bottom is provided with first movable contact spring (11) that often contacts with first static contact (1), being on the first static contact return portion of switch arm (6) side laterally, lever is connected with corresponding second static contact (2) respectively, second movable contact spring (12) of the 3rd static contact (3), the 3rd movable contact spring (13), the side of switch arm (6) is provided with boss (6-1), switch arm (6) is in moving, first movable contact spring (11) priority and second static contact (2), the 3rd static contact (3) contact, synchronously, switch arm (6) can successively be controlled second movable contact spring (12) by boss (6-1), the 3rd movable contact spring (13) and corresponding second static contact (2), the 3rd static contact (3) contact.

2, electric tool switch according to claim 1 is characterized in that: the described boss (6-1) on above-mentioned switch arm (6) side is an angle square shape.

3, electric tool switch according to claim 1 is characterized in that: above-mentioned switch arm (6) comprises the spring (6-3) in matrix (6-2) and the insertion matrix chamber, and the outer end of spring (6-3) is against on the madial wall of housing (5).

4, electric tool switch according to claim 1 is characterized in that: all movable contact springs all are elastic contact blade.

5, electric tool switch according to claim 1 is characterized in that: be connected for guiding between above-mentioned switch arm (6) and housing (5) interconnection (5-1) bottom surface.

6, electric tool switch according to claim 5, it is characterized in that: switch arm (6) is connected with guiding between housing (5) interconnection (5-1) to be taked to establish rail groove (5-2) on interconnection (5-1) bottom surface, the bottom surface of switch arm (6) is provided with the gib block (6-5) corresponding with above-mentioned rail groove (5-2), and switch arm (6) is connected with the housing bottom surface with the cooperation of described rail groove by gib block and moves in passage (5-1) along described rail groove.