CN2906875Y

CN2906875Y - Electric tool switch

Info

Publication number: CN2906875Y
Application number: CN 200620018885
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: 2007-05-30
Anticipated expiration: 2016-04-28

Abstract

The utility model discloses an electric switch, which comprises a casing and a switch arm protruding from the casing; a first, a second and a third static contact chips are vertically arranged at the bottom of the casing; in addition, the casing is also provided with a fourth static contact chip and a transverse channel, the switch arm is positioned in the transverse channel; the bottom of the switch arm is provided with the first dynamic contact chip keeping in contact with the first static contact chip; for the first static contact chip nearby the switch arm, the turning portion is transversely connected to the second and the third dynamic contact chips correspondingly to the second and third static contact chips; a boss is positioned laterally on the switch arm; the first dynamic contact chip contacts with the second and the third static contact chips in sequence during the shift of the switch arm; similarly, the switch arm can control the second and the third dynamic contact chips via a boss to contact with the second and the third static contact chips. With two independent loops for double-chip contact, the switch can reduce the heating of the contact chip through shunting, and guarantee excellent stability and reliability with longer service life.

Description

Electric tool switch

Technical field

The utility model 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.

The utility model content

The purpose of this utility model provides a kind of electric tool switch of safe and reliable, long service life.

The technical solution of the utility model 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, second, third 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, be on the first static contact return portion of switch arm side second and third movable contact spring that horizontal lever is connected with respectively corresponding second and third static contact, the side of switch arm is provided with boss, switch arm is in moving, first movable contact spring successively contacts with second and third static contact, synchronously, switch arm can successively be controlled second and third movable contact spring and second and third corresponding static contact contact by boss.

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 transverse rails groove by gib block and moves in passage along the rail groove.

Good effect of the present utility model is: 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

For the easier quilt of content of the present utility model is clearly understood, according to specific embodiment also in conjunction with the accompanying drawings, the utility model is described in further detail, wherein below

Fig. 1 is the structural representation of the utility model switch;

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, second movable contact spring that is connected with first static contact;

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 the utility model switch in motion process;

Fig. 9 is the circuit diagram of the utility model switch 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, second, third

static contact

1,2,3 (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 4 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, interconnection 5-1 establishes rail groove 5-2 on the bottom surface, 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, three

movable contact springs

12,13 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, switch arm 6 can move in this passage 5-1, 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 with the cooperation of transverse rails groove by gib block and moves in passage 5-1 along the rail groove.Be on first static contact, 1 return portion of switch arm 6 sides second and third

movable contact spring

12,13 that horizontal lever is connected with respectively corresponding second and third

static contact

2,3, second movable contact spring 12 realizes that by spring 12-1 elasticity connects (not drawing among the figure), and the 3rd movable contact spring 13 realizes that by spring 13-1 elasticity connects.Be that 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 has effect lower edge interconnection 5-1 to move in housing 5 in 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, second, third static contact (1,2,3) 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 above-mentioned 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), be on the first static contact return portion of switch arm (6) side laterally lever and be connected with respectively corresponding second, three static contacts (2,3) second, three movable contact springs (12,13), the side of switch arm (6) is provided with boss (6-1), switch arm (6) is in moving, first movable contact spring (11) is successively with second, three static contacts (2,3) contact, synchronously, switch arm (6) can successively control second by boss (6-1), three movable contact springs (12,13) with corresponding second, three static contacts (2,3) contact.

2, electric tool switch according to claim 1 is characterized in that: the 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 transverse rails groove by gib block and moves in passage (5-1) along the rail groove.