CN2896485Y

CN2896485Y - Dust-proof speed-regulation switch of electric tool

Info

Publication number: CN2896485Y
Application number: CN 200620100138
Authority: CN
Inventors: 杨法德
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-01
Filing date: 2006-01-01
Publication date: 2007-05-02
Anticipated expiration: 2016-01-01

Abstract

The utility model discloses a dust-proof speed-control switch for electric tools, comprising a switch body (2), a trigger (1), a pushrod assembly (3), upper and lower cover plates (4, 5), a first and a second movable contact plates (8, 9), the bracket (13), the brush (18), and the control circuit board (19). The obverse and the reverse sealed grooves (16, 17) are arranged surrounding the area of contact movement (20) of the switch body (2); the upper and the lower cover plates (4, 5) contains cord tissues which match the obverse and the reverse sealed grooves (16, 17); the switch body (2) contains a seal ring (15) which match the pushrod assembly (3). The bracket (13) is set on the switch body (2); the first and the second movable contact plates (8, 9) are movably set on the bracket (13); the pushrod assembly (3) has two springs (10, 11) and sliders (6, 7); the sliders (6, 7) contact movably with the first and the second contact plates (8, 9) in sequence. With the above construction, the utility model has a simple but reasonable structure, good dust-proof effect, and uniform pressure between contacts; it is safe and reliable, and has a long service life.

Description

The electric tool speed-regulating switch that prevents dust

Technical field

The utility model relates to the switch that uses on a kind of electric tool, particularly a kind of AC speed regulating switch of controlling the electric tool rotating speed.

Background technology

At present, for the ease of regulating the rotary speed of electric tool, on general electric tool, speed-regulating switch is housed all, as Chinese patent 99227970.4 disclosed a kind of electric tool electronic speed-regulating switch, this switch in use has two big weak points: the one, and switch in use dust can directly enter into the contact active region of switch inside from the slit that cooperatively interacts, will influence the serviceability of switch after dust accumulates over a long period, cause problems such as the contact sparking is serious, closure is not in place; The 2nd, the plate of movable contact up and down of this switch is by the two-way contact force that provides of same spring, in moving process, can make up and down that the contact contact pressure of movable contact plate changes (time big, time little), phenomenons such as sparking, flashover between the contact very easily appear, the silver layer of contact is sustained damage, shorten the useful life of switch, when serious between the contact even produce sintering, appearance can not disjunction phenomenon, thereby the effect of forfeiture switch.

Summary of the invention

In order to overcome the above-mentioned defective that existing speed-regulating switch exists, problem to be solved in the utility model provides the dustproof speed-regulating switch of electric tool that pressure is even, safe and reliable, the life-span is long between a kind of simple and reasonable, good dustproof effect, contact.The technical scheme that its technical problem that solves the utility model adopts, it comprises switch body, trigger, push-rod assembly, cover plate up and down, first and second movable contact plate, support, contact chip, binding post, brush, control circuit board, the first movable contact plate is provided with and corresponding contact, binding post contact, the second movable contact plate is provided with and corresponding contact, contact chip contact, the contact active region periphery of described switch body is provided with the front and back seal groove, on, lower cover is provided with the raised line that is complementary with the front and back seal groove, switch body is provided with the sealing ring that is sealed and matched with push-rod assembly, makes the contact active region of switch body form airtight space.Described brush one end is arranged on the push-rod assembly, and its other end contacts with control circuit board.

For the contact contact pressure on first and second movable contact plate is consistent substantially, described support is arranged on the switch body, first and second movable contact plate is movably arranged on the support respectively, push-rod assembly is provided with the spring and the slide block of two groups of mutual dislocation, slide block contacts with first and second movable contact plate is movable successively, and first and second movable contact plate is arranged on the same side of push-rod assembly.

After adopting said structure, the contact active region of switch body forms airtight space, can prevent effectively that dust from entering the contact active region from the slit that cooperates; Two groups of springs are set on the push-rod assembly contact with first and second movable contact plate is movable respectively, the contact contact pressure on first and second movable contact plate all can be remained unchanged, thereby make switch contact obtain reasonable, effective, lasting effect with slide block; Have advantages such as simple and reasonable, good dustproof effect, working stability are reliable, long service life.

Description of drawings

Fig. 1 is a Facad structure schematic diagram of the present utility model.

Fig. 2 is a structure schematic diagram of the present utility model.

Fig. 3 is the A-A cross-sectional view of Fig. 1.

Fig. 4 is the B enlarged diagram of Fig. 3.

Fig. 5 is the C enlarged diagram of Fig. 3.

Embodiment

Fig. 1 is to shown in Figure 5, specific embodiments for the dustproof speed-regulating switch of a kind of electric tool of the utility model, it comprises switch body 2, trigger 1, push-rod assembly 3, cover plate 4 up and down, 5, first and second

movable contact plate

8,9, support 13, contact chip 14, binding post 12, brush 18, control circuit board 19, the first movable contact plate 8 is provided with and corresponding contact, binding post 12 contacts, the second movable contact plate 9 is provided with and corresponding contact, contact chip 14 contacts, binding post 12, contact chip 14 respectively with power input, the motor input connects, contact active region 20 peripheries of described switch body 2 are provided with front and

back seal groove

16,17, on,

lower cover

4,5 are provided with and front and

back seal groove

16,17 raised lines that are complementary, switch body 2 is provided with the sealing ring 15 that is sealed and matched with push-rod assembly 3, make the contact active region 20 of switch body 2 form airtight space, can prevent effectively that dust from entering contact active region 20 from the slit that cooperates, solve because the contact dust stockpiles and causes sparking, closed problem not in place.Described brush 18 1 ends are arranged on the push-rod assembly 3, and its other end contacts with control circuit board 19.Described support 13 is arranged on the switch body 2 by flexure strip, first and second

movable contact plate

8,9 are movably arranged on respectively on the support 13, with support 13 as first and second movable contact plate 8, the strong point of 9 activities, push-rod assembly 3 is provided with the spring 10 of two groups of mutual dislocation, 11 and

slide block

6,7,

slide block

6,7 successively with first and second

movable contact plate

8,9 movable contacts, first and second

movable contact plate

8,9 are arranged on the same side of push-rod assembly 3, make first and second

movable contact plate

8,9 contact pressures that are subjected to all can remain unchanged, thereby the contact of switch is obtained rationally, effective and lasting use.

The utility model course of work is as follows: press trigger action 1, trigger 1 drives push-rod assembly 3 and moves inward, two groups of

slide blocks

6,7 that push-rod assembly 3 drives push-rod assembly 3 slide at first and second

movable contact plate

8,9 successively, when slide block 6 at first slips over support 13 strong points of the first movable contact plate 8, the closing of contact of the contact of the first movable contact plate 8 and binding post 12, and connect circuit and start working; When push-rod assembly 3 continued to move inward, push-rod assembly 3 drove brush 18 and slides on the resistive film of control circuit board 19, constantly changes the resistance of resistive film, and constantly changes output voltage; When slide block 7 slips over support 13 strong points of the second movable contact plate 9, the closing of contact of the contact of the second movable contact plate 9 and contact chip 14, this moment control circuit board 19 by short circuit, the output voltage maximum, thus realize the function of stepless time adjustment.

Claims

1, a kind of electric tool speed-regulating switch that prevents dust, comprise switch body (2), trigger (1), push-rod assembly (3), cover plate (4 up and down, 5), first and second movable contact plate (8,9), support (13), contact chip (14), binding post (12), brush (18), control circuit board (19), the first movable contact plate (8) is provided with and corresponding contact, binding post (12) contact, the second movable contact plate (9) is provided with and corresponding contact, contact chip (14) contact, it is characterized in that: contact active region (20) periphery of described switch body (2) is provided with front and back seal groove (16,17), on, lower cover (4,5) be provided with and front and back seal groove (16,17) raised line that is complementary, switch body (2) is provided with the sealing ring (15) that is sealed and matched with push-rod assembly (3), makes the contact active region (20) of switch body (2) form airtight space.

2, the dustproof speed-regulating switch of electric tool according to claim 1, it is characterized in that: described support (13) is arranged on the switch body (2), first and second movable contact plate (8,9) is movably arranged on respectively on the support (13), push-rod assembly (3) is provided with the spring (10,11) and the slide block (6,7) of two groups of mutual dislocation, slide block (6,7) contacts with first and second movable contact plate (8,9) is movable successively, and first and second movable contact plate (8,9) is arranged on the same side of push-rod assembly (3).

3, the dustproof speed-regulating switch of electric tool according to claim 1 and 2, it is characterized in that: described brush (18) one ends are arranged on the push-rod assembly (3), and its other end contacts with control circuit board (19).