CN1205082A

CN1205082A - Opening arrangement of ammeter pincers

Info

Publication number: CN1205082A
Application number: CN 97191357
Authority: CN
Inventors: D·阿诺克斯; A·阿诺克斯; C·让特
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-10
Filing date: 1997-10-10
Publication date: 1999-01-13

Abstract

The invention concerns an opening arrangement of pliers such as a clamp-on probe. The arrangement comprises a fixed pliers jaw (1) carried by a fixed lever (2) and a mobile pliers jaw (3) carried by a lever (4) mounted pivoting on the fixed lever, about an axis (O) integral with it, between the opening and closing positions of the pliers, a draw spring for returning the pivoting lever in the closing position of the pliers. The arrangement is characterised in that the spring (7) is set between a location (P) on the fixed lever (2) and a location (M) on the pivoting lever (4), so that the spring is extended when the lever (4) pivots from its closing position into its opening position and draws nearer to the pivoting axis (O) such that the increase in the restoring force (Fr) is accompanied by a decrease of the lever arm (dr) of this force about the pivoting axis (O). The invention is useful for clamp-on probes.

Description

The opener of ammeter pincers

What the present invention relates to is the opener of pliers, the opener of tong-type ammeter for example, this opener comprises a fixedly mounting board that is carried by fixed handle, with a movable mounting board that carries by swing handle, the coupling shaft that live splint is stuck on the fixed handle around this fixed handle rotates, slewing area is between the closure and open site of pliers, and this opener also has a handle return tension spring that can rotate in the pliers make-position.

The opener of more known ammeter pincers has used some tension springs and compression spring, and the opening force of spring is on the axle of spring.The subject matter of this mechanism is the opening force linear increase with opening angle substantially of pliers, and this just makes range of application be restricted, and make to open needed power increase, and opening force also increases with the angle of opening.

The object of the present invention is to provide a kind of pliers opener that overcomes above-mentioned defective.

In order to achieve the above object, mechanism of the present invention is characterised in that: a spring is set between fixed handle position and swing handle position, when handle spring elongation when the pliers make-position turns to the open site of pliers, this spring is near the rotating shaft of these two handles, so the increase of restoring force reduces the arm of force of handle when rotating around the axis of this power of generation.

According to a feature of the present invention, be roughly the right angle between the axle of tension spring and the axle of opening force.

According to a favorable characteristics of the present invention, an end of helical spring spring preferably is fixed to swing handle free end zone, and the helical spring other end is fixed to the be separated by position of preset distance of fixed handle and rotating shaft swing handle, thereby spring shaft and be roughly the right angle by the angle between the straight line of rotating shaft and spring fixed position.

Will more be expressly understood the present invention below by description taken together with the accompanying drawings, and can be more clearly visible other details of the present invention and advantage, these accompanying drawings only are that the example of the embodiment of the invention as an illustration provides, wherein:

Fig. 1 is the skeleton view of tong-type ammeter of the present invention;

Fig. 2 and Fig. 3 are perpendicular to the synoptic diagram on the II-II plane of Fig. 1 ammeter pincers, and the opener of expression pliers of the present invention is the position when pliers is in closed and unlatching respectively;

The view of Fig. 4 is represented ruuning situation of the present invention.

Can see as Fig. 1 to 3, reometer with opener of the present invention comprises a fixedly mounting board 1 that is carried by box-like fixed handle 2, with a movable mounting board 3 that carries by the handle 4 that is called clamp, handle 2 is used to install the circuit arrangement of pliers, handle 4 is contained in the box-like handle 2, and the axle 0 that winds by fixed handle 2 supportings rotates.

As shown in the figure, with to form fixed part by mounting board 1 and handle 2 the same, obtain mounting board 3 and handle 4 by two half component groups with respect to vertical mid-plane II-II symmetry are fitted together, above-mentioned plane is perpendicular to rotating shaft 0.

Can also see, mounting board is pivotally connected to the inside of box 2, make it simultaneously by a hole 6 that is arranged on box 2 sides.In Fig. 2 and Fig. 3, pliers only is shown half, in order to be clear that per half fixture and the movable part inner structure of pliers, so second half pliers has been removed, these two half pliers are in the both sides of described middle symmetrical plane.Because other ordinary construction feature of pliers is not as a part of the present invention, so no longer be described in detail.

Pliers opener of the present invention is characterised in that it comprises a volute spring 7, one end (representing with m) of this spring is fixed to the free end of mounting board, and its other end be fixed to one with pin 10 that box 2 is connected on, this pin is in the P place separated by a distance with rotating shaft 0, straight line by rotating shaft 0 and position P is represented with a, angle between the axle of this straight line and the spring 7 represented with b is α, and this corner connection is near or equal the right angle.

As shown in the figure, in order to open pliers, mounting board 4 is turned to position shown in Figure 3 from position shown in Figure 2, apply a directed force F o to mounting board simultaneously, this acting force is opposite with the restoring force Fr of spring 7.In these accompanying drawings, label do and dr represent around the shaft the handle arm of force of the moment that 0 power Fo and Fr produce.

Now Fig. 2 and Fig. 3 are compared, can find that spring 7 has extended, that is to say, restoring force almost increases with rotational angle β is linear, this can see clearlyer in Fig. 4, in the figure, PM1 and PM2 represent the spring 7 of pliers when closed and unlatching, and OM1 and OM2 represent mounting board in both cases.

But these accompanying drawings also clearly illustrate that, the spring shaft shown in PM1 on Fig. 4 and the direction of PM2 is near rotating shaft 0, and arm of force dr of this expression handle obviously reduces, and this is as dr1 and dr2 shown in relatively.

Therefore, the minimizing of handle arm of force dr has replenished the increase of restoring force.That is to say that mechanism of the present invention is with respect to well known organization, opening force is along with opening angle slowly increases.In addition, another advantage of the present invention is to have reduced volume with respect to well known organization.Because the closed necessary forces of mounting board defines the size of spring.The present invention can be arranged on spring in a part of mounting board, rather than is arranged in a part of box, and this can help to increase the volume of mechanism, and this as described in the prior art.The sky space of getting off can be used for electronic section is installed in the box like this.

Certainly, can carry out various variations to the present invention who describes in conjunction with the accompanying drawings, but not exceed scope of the present invention.Also can be arranged in the swing handle recited above, and be arranged between the position on the handle of run-on point 0 top recovering spring.In Fig. 2, the axle that is spring when the above-mentioned position that can reach that mixes that dotted line illustrates as an example.

Claims

1. the opener of a pliers, the opener of tong-type ammeter pliers for example, this opener comprises a fixedly mounting board that is carried by fixed handle, with a movable mounting board that carries by swing handle, the coupling shaft that live splint is stuck on the fixed handle around this fixed handle rotates, slewing area is between the closure and open site of pliers, this opener also has a handle return tension spring that can rotate in the pliers make-position, it is characterized in that between position (P) on the fixed handle (2) and the position (M) on the swing handle (4), a spring (7) being set, when handle (4) spring elongation when the pliers make-position turns to the open site of pliers, this spring is near rotating shaft (0), and the arm of force (dr) when rotate (0) around the shaft so the increase of restoring force (Fr) makes the handle of this power of generation reduces.

2. mechanism according to claim 1 is characterized in that when pliers is closure state, is roughly the right angle between the axle (b) of tension spring (7) and the axle (Fo) of opening force.

3. mechanism according to claim 2, it is characterized in that will be preferably an end (M) of helical spring spring (7) be fixed to the free end zone of swing handle (4), and with the be separated by position of preset distance of the rotating shaft that the helical spring other end (P) is fixed to fixed handle, thereby spring shaft (b) and be roughly the right angle by the angle (α) between the straight line (a) of rotating shaft (0) and spring (7) fixed position (P) with swing handle (4).

4. according to claim 2 or 3 described mechanisms, it is characterized in that spring (7) is arranged in the flexible handle (4), and with the substantially parallel axes of flexible handle.

5. mechanism according to claim 1 is characterized in that (P M) is positioned between the rotating shaft (0) and mounting board (1,3) in the part handle (2,4) for the fixed position of spring (7).

6. according to the described mechanism of above-mentioned arbitrary claim, it is characterized in that swing handle (4) is arranged in the fixed handle (2) versatilely, spring (7) is fixed in the fixed handle (2) (representing with P).