CN2676379Y

CN2676379Y - Switch mechanism

Info

Publication number: CN2676379Y
Application number: CN 03277674
Authority: CN
Inventors: 刘全刚
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2003-08-15
Filing date: 2003-08-15
Publication date: 2005-02-02
Anticipated expiration: 2013-08-15

Abstract

The utility model relates to a switch mechanism, comprising the first snap fastener (1), the second snap fastener (2) which is apart from the first snap fastener at a certain distance, and a switch (3). A rail (4) is arranged in the second snap fastener, and a triggering mechanism (5) is pivotally connected with the first snap fastener and moves on the rail. When the first snap fastener and the second snap fastener are all pressed down, the triggering mechanism triggers the switch and makes the switch be in the first operating state; when any one of the first snap fastener and the second snap fastener is loosened, the switch is in the second operating state. The switch mechanism has simple structure, convenient operation and low cost.

Description

Switching mechanism

Technical field

The utility model relates to a kind of switching mechanism, refers to a kind of electric tool that is used for especially, as the switching mechanism on the lopping shears.

Background technology

In the prior art, with reference to United States Patent (USP) the 5th, 724, No. 737, this patent disclosure a kind of switching mechanism that is used on the electric shrub and hedge trimmer.This switching mechanism comprises first, second starting switch, is located at switch, the joystick member that links to each other with switch and a safety switch in the casing.During operation, start safety switch earlier, when depressing first, second starting switch simultaneously then, starting switch; When unclamping any one in first, second starting switch, off switch.But, the more thereby structure more complicated of the element of this switching mechanism, cost is higher relatively.So, be necessary to provide a kind of simple in structure and switching mechanism of convenient and reliable operation.

Summary of the invention

The purpose of this utility model is to provide a kind of switching mechanism simple in structure.

The purpose of this utility model is achieved in that a kind of switching mechanism, second snapper and a switch of comprising first snapper, being separated by with first snapper, be provided with track in described second snapper, one trigger mechanism and described first snapper are pivotally connected, and trigger mechanism is arranged on the described track movably; When first snapper and second snapper all are in the state of depressing, described trigger mechanism conflict switch makes switch be in first operating state, when first snapper or second snapper were in the state that unclamps, described trigger mechanism breaks away from switch made switch be in second operating state.

The beneficial effects of the utility model: the parts of switching mechanism are few and simple in structure, so with low cost; The while convenient and reliable operation.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified;

Fig. 1 is applied to the cutaway view of lopping shears for the utility model;

Fig. 2 is first snapper and second snapper structure chart when being in the state that unclamps;

Fig. 3 is that first snapper is depressed, the structure chart when second snapper unclamps;

Fig. 4 is that second snapper is depressed, the structure chart when first snapper unclamps;

Fig. 5 is that second snapper is depressed, the structure chart when first snapper is depressed;

Fig. 6 is the partial enlarged drawing of Fig. 5.

Among the figure: 1. first snapper, 10. casings, 11. motors, 12 blades, 13. first pivots, 14. second pivots, 15. fixed handles 16. the 3rd pivot, 17. springs, 2. second snappers, 3. switches, 4. tracks, 5. trigger mechanisms, 6. rollers, 7. connecting rods 32. trigger lever 34. contacts 35. surface 42. first spigot surfaces, 44. second spigot surfaces, 46. transition faces

Embodiment

With reference to Fig. 1, switching mechanism of the present utility model is generally used on a kind of electric tool that is called on the lopping shears.Lopping shears generally include casing 10, are located at the motor 11 in the casing 10, the blade 12 that is driven by motor 11, and the switching mechanism that is connected with the casing phase pivot.

Fig. 2 is in the position diagram of initial condition for above-mentioned switching mechanism.This switching mechanism comprises first snapper 1, and first snapper 1, second snapper 2 separated by a distance, is located at trigger mechanism 5 and switch 3 between first snapper 1 and second snapper 2.When position shown in Figure 2, this switch 3 is in second operating state, and promptly switch disconnects.

First snapper 1 is connected with casing 10 phase pivots by first pivot 13, and second snapper 2 is connected with casing 10 phase pivots by second pivot 14.Lopping shears of the present utility model also comprise a fixed handle 15, and this fixed handle 15 is positioned at the below of first snapper 1 and links to each other with first snapper 1 by spring 17.Be provided with a track 4 in the front end of second snapper 2.This track 4 comprises first spigot surface 42, second spigot surface 44 and the transition face 46 that connects first spigot surface 42 and second spigot surface 44.Described trigger mechanism 5 is included in a roller 6 and a connecting rod 7 that rolls on the track 4.Described roller 6 rolls on described first,

second spigot surface

42,44 and transition face 46.Described connecting rod 7 is a kind of steel wire or similar material, and one end and roller 6 are pivotally connected and the other end is pivotally connected by the 3rd pivot 16 and first snapper 1.Switch 3 is located in the casing 1, comprises triggering lever 32 and contact 34, wherein triggers lever 32 and has a surface 35.

Fig. 3 is that first snapper 1 is depressed (direction shown in arrow a among the figure) around first pivot 13 to fixed handle 15, and the position diagram of the switching mechanism of second snapper 2 when motionless.At this moment, trigger mechanism 5 can move forward and backward around the 3rd pivot 16 along with the rotation of first snapper 1, and roller 6 upwards climbs along first spigot surface 42 of track 4 simultaneously.Because the distance between first spigot surface 42 and the triggering lever 32 is greater than the diameter of roller 6, trigger switch 3 makes 3 on switch be in second operating state so roller 6 can not touch triggering lever 32.

Fig. 4 is second snapper 2 when depressing (direction shown in arrow b among the figure) fully around second pivot 14, and the position of the switching mechanism 5 of first snapper 1 when motionless.At this moment, the track 4 of second snapper 2 is pushing away roller 6 works relative to moving of making progress.When depressing (promptly being in extreme position) fully at snapper 2, roller 6 contacts with the surface 35 of triggering lever 32 but there is no active force therebetween and produces, and still is in second operating state so the triggering lever 32 of switch 3 can not be triggered, i.e. the state of switch disconnection.

Figure 5 shows that the operating state when first,

second snapper

1,2 is all depressed (direction shown in arrow a, the b), this state is the stack of the position of Fig. 3 and switching mechanism shown in Figure 4.At this moment, under the effect of first,

second snapper

1,2, roller 6 is pushed to and the triggering lever 32 thereby the triggering lever 32 of depress switch 3 trigger contacts 34, and like this, switch 3 changes to first operating state from second operating state, i.e. the state of switch closure.Therebetween, roller 6 rolls along first spigot surface 42 of track 4.Unclamp any one in first,

second snapper

1,2, then roller 6 is under the drive of first or

second snapper

1,2 and break away from the triggering lever 32 of switch 3, and this moment, switch 3 carried out the transition to second operating state from first operating state again.

With reference to Fig. 6, when switch 3 was in first operating state shown in Figure 5, the surface 35 of described triggering lever 32 and first spigot surface 42 of described track 4 be keeping parallelism roughly.Because of first,

second snapper

1,2 is manual, so the active force on it can be not in full accord and be had small variation, but the minor variations of this active force can't cause switch 3 to change to second operating state from first operating state; At this moment, roller 6 can because of the minor variations of the active force on first,

second snapper

1,2 in rolling between first spigot surface 42 of track 4 and the surface 35 of triggering lever 32.Because between the surface 35 of first spigot surface 42 of track 4 and triggering lever 32 is almost parallel, so roller 6 can trigger lever 32 stably and guarantee that switch 3 has reliable and stable operating state.

Claims

1, a kind of switching mechanism, second snapper (2) and the switch (3) that comprise first snapper (1), be separated by with first snapper (1), it is characterized in that: be provided with track (4) in described second snapper (2), one trigger mechanism (5) is pivotally connected with described first snapper (1), and trigger mechanism (5) is arranged on the described track (4) movably; When first snapper (1) and second snapper (2) all are in the state of depressing, described trigger mechanism (5) conflict switch (3) makes switch (3) be in first operating state, when first snapper (1) or second snapper (2) were in the state that unclamps, described trigger mechanism (5) breaks away from switch (3) made switch (3) be in second operating state.

2, switching mechanism according to claim 1, it is characterized in that: described trigger mechanism (5) comprises a roller (6) and a connecting rod (7) that rollably is arranged on the track (4), one end of described connecting rod (7) and roller (6) are pivotally connected, and the other end of connecting rod (7) and first snapper (1) are pivotally connected.

3, switching mechanism according to claim 2, it is characterized in that: described track (4) comprises first spigot surface (42), second spigot surface (44) and connects first spigot surface (42) and the transition face (46) of second spigot surface (44) that the circumferential surface of described roller (6) is positioned on described first spigot surface (42) or second spigot surface (44) or the transition face (46).

4, switching mechanism according to claim 1 is characterized in that: described switch (3) comprises that one triggers lever (32), and this triggering lever (32) comprises a surface (35).

5, switching mechanism according to claim 4 is characterized in that: when switch (3) is in first operating state, and first spigot surface (42) almost parallel on the surface (35) of described triggering lever (32) and the described track (4).

6, switching mechanism according to claim 4 is characterized in that: when switch (3) was in first operating state, the periphery of described roller (6) was positioned on first spigot surface (42) of described track (4).

7, switching mechanism according to claim 4 is characterized in that: when switch (3) was in second operating state, the distance between the surface (35) of described switch (3) and first spigot surface (42) of track (4) was greater than the diameter of roller (6).

8. switching mechanism according to claim 1 is characterized in that: described first snapper (1) is pivotally connected by first pivot (13) and casing (10).

9. switching mechanism according to claim 1 is characterized in that: described second snapper (2) is pivotally connected by second pivot (14) and casing (10).