CN2341261Y - Stepless speed changing switch - Google Patents

Abstract

The utility model relates to a structural design of a stepless speed changing switch utilizing on an electric tool. The utility model is mainly formed by the combination of a left casing, a right casing, a pressing part, a guide rod and a control circuit board; the left casing and the right casing are respectively provided with a holding part for holding the control circuit board and the guide rod; the left casing and the right casing are combined to form a complete casing; the pressing part is longitudinally installed on the front end of the casing; the rotary speed of a motor on an electric tool can be automatically controlled by the downward pressing force application of the pressing part and the action of a control circuit to cause the convenience for users to be improved.

Description

The continuous variable speed switch

The utility model is the structural design of relevant a kind of utilization continuous variable speed switch on electric tool, makes it promote user's convenience.

Along with science and technology development, everything requires quick, convenient and for the use of electric tool the trend that increases is gradually arranged, but following several forms of the big reduction of a fraction of electric tool switch structure on the market now:

1, the electric tool of constant speed switch:

This kind construction of switch only can only provide simple ON-OFF power turn-on, makes the rotating speed of electric tool can only be maintained in certain speed, makes so at work, also can't effectively utilize as must use the electric tool of different rotating speeds the time, increases user's inconvenience.

2, the electric tool of sectional varying speed switch:

This kind construction of switch promptly adds a segmentation speed change knob by above-mentioned construction of switch from the side, make it have the segmentation speed changing function, though partly improve the shortcoming of above-mentioned switch, often must stop in using the electric tool way, adjusts the speed change knob and carries out work again.Obviously at present the switch of electric tool all has its shortcoming, and can't satisfy the user need, further improved necessity is arranged really.

In view of this this creator satisfies the scientific principle knowledge of utilization itself and practical experience for many years, and a kind of novel continuous variable speed switch is developed in throw oneself into research and test repeatedly finally.

In view of this, the purpose of this utility model provides a kind of continuous variable speed switch, its utilizes the size of pushing the application of force in the press section downwards, and can control the speed of the rotating speed of motor on the electric tool automatically via the control circuit effect, makes it promote user's convenience.

The utility model is mainly by left and right housing, press section, guide rod and control circuit board combine, this left and right housing respectively has a holding part for placing control circuit board and guide rod, left and right shell combination is then formed a complete housing, this press section is vertically to be installed on the housing front end, according to the size of the press section application of force, can control the speed of rotating speed of the motor of electric tool automatically.

For ease of understanding the purpose of this utility model, feature and effect, now in conjunction with specific embodiments, and conjunction with figs., the utility model is described in detail:

Description of drawings:

Fig. 1 is a stereogram of the present utility model;

Fig. 2 is STRUCTURE DECOMPOSITION figure of the present utility model;

Fig. 3 is an interior views of the present utility model;

Fig. 4 is an effect schematic diagram of the present utility model;

Fig. 5 is an action schematic diagram of the present utility model ();

Fig. 6 is an action schematic diagram of the present utility model (two);

Fig. 7 is control circuit figure of the present utility model;

Fig. 8 is a circuit diagram of the present utility model.

The figure number explanation:

10 ... switch 31 ... half-arc groove

20 ... left shell 32 ... holding part

21 ... half-arc groove 321 ... raised line

22 ... holding part 322 ... projection

23 ... lug 33 ... n-type rack

24 ... lug 331 ... protruding button

25 ... junction surface 332 ... protruding button

30 ... right shell body 34 ... first conducting strip

341 ... salient point 52 ... control circuit

342 ... connect spring 521 ... carbon plate resistance

343 ... arc portion 522 ... semifixed resistor

35 ... second conducting strip 523 ... rectification circuit

351 ... salient point 60 ... L type conducting strip

352 ... connect spring 61 ... salient point

353 ... arc portion 70 ... guide rod

36 ... junction surface 71 ... cylinder

361 ... slot 72 ... carbon brush

37 ... rectangular channel 73 ... slotted eye

371 ... circular groove 74 ... sliding tray

38 ... conducting block 75 ... long hypotenuse

381 ... hole 76 ... short hypotenuse

382 ... spiral shell 77 ... pothole

383 ... salient point 78 ... packing ring

384 ... pad 79 ... Jie's type projection

39 ... screw 80 ... fixing button

40 ... press section 81 ... spring

41 ... circular recess 90 ... returning spring

42 ... flange 100 ... motor

421 ... rectangular opening

50 ... control circuit board

51 ... circuits for triggering

As shown in Figure 1 to Figure 3, the utility model is a kind of structural design of continuous variable speed switch 10, and it mainly is made up of press section 40, left and right housing 20,30, guide rod 70 and control circuit board 50, wherein:

Be provided with a circular recess 41 in the middle of the rear portion of press section 40, one side appropriate location is provided with flange 42, and a rectangular opening 421 is arranged at these flange 42 tops.

The front portion of left shell 20 is provided with a half-arc groove 21, be provided with holding part 22 in it and place for control circuit board 50, its junction surface 25 is provided with two lugs 23,24, again below this lug 24, other has installed L type conducting strip 60, and these L type conducting strip 60 ends are provided with a salient point 61.

The front portion of right shell body 30 is provided with a half-arc groove 31, two slots 361 are arranged on its junction surface 36, in be provided with holding part 32 and place for guide rod 70, raised line 321 is arranged in the middle of in the holding part 32, be connected with one " Jiong " type frame 33 on its raised line 321, appropriate location, both sides that should " Jiong " type frame 33 respectively has two protrudingly relatively to buckle 331,332 in order to buckle first conducting strip 34 and second conducting strip 35, these first conducting strip, 34 upper ends are to be special arc portion 343, its bottom is provided with a salient point 341, these second conducting strip, 35 upper ends are to be a special arc portion 353 again, its bottom side is provided with a salient point 351, and its first, second guide card 34,35 appropriate location is socketed with and connects spring 342,352, this two connections spring 342,352 the other end respectively is socketed on two projections 322, connect spring 342 in order to two, 352 is fixing, and can allow first, two conducting strips 34,35 reply action.

Be equipped with two conducting blocks 38 in right shell body 30 bottoms, other device has pad 384 on this conducting block 38, this pad 384 is provided with a salient point 383, and be a hole 381 in the middle of this two conducting block 38, insert for power line, and utilize screw 382 to place two screws 39 in right shell body 30 outsides, deciding power line by clamping, be provided with flange 42 insertions of a rectangular channel 37 in addition for press section 40 in the outside of right shell body 30, and on rectangular channel 37 front ends, be provided with a circular groove 371 in addition, for fit fixing button 80 and spring 81, and can be by pushing fixing button 80, make its leading edge penetrate default rectangular opening 421 on the flange 42 of press section 40, and can reach the fixedly position of press section 40, further reach the purpose of switch 10 constant speed.

The front portion of guide rod 70 is to be a cylinder 71, socket is placed through the circular recess 41 on the press section 40, and a slotted eye 73 is arranged on its guide rod 70 1 sides, in order to be nested with carbon brush 72, Jie's type projection 79 of outer likeness in form " Jie " font is arranged on its opposite side, should be provided with a sliding tray 74 in the middle of " Jie " shape projection 79, the one side is long hypotenuse 75, and opposite side is provided with a flange 761 in addition for short hypotenuse 76 on this weak point hypotenuse 76, in these guide rod 70 bottoms one pothole 77 is arranged again, place for returning spring 90.

As shown in Figure 7, also include control circuit 52 and circuits for triggering 51 on this control circuit board 50, wherein control circuit includes:

Carbon plate resistance 521 by the resistance that two carbon plates are formed, is used for adjusting the magnitude of voltage of control circuit output.

Semifixed resistor 522 can be done the laser fine setting to the carbon plate thickness of carbon plate resistance 521, and face is assisted the action of carbon plate resistance 521.

Rectification circuit 523 is made up of two rectifier diode D1, D2, is direct current with AC rectification.

Circuits for triggering 51 are with the direct current after the rectification, make its short circuit as triggering the SCR element.

During assembling, earlier control circuit board 50 and L type conducting strip 60 are inserted left shell 20, in regular turn " Jiong " type frame 33 and two conducting blocks 38 are inserted in the holding part 32 of right shell body 30 again.Again with first, two conducting strips 34,35 are fastened on that the both sides of " Jiong " type frame 33 are protruding buckles 331, on 332, and to connect spring 342,352 connect first, two conducting strips 34,35 and be fixed on the projection 322, in addition the bottom pothole 77 of guide rod 70 is inserted returning spring 90 earlier, then the sliding tray 74 of guide rod 70 is aimed at raised line 321 on the holding part 32 of right shell bodies 30, and also guide rod 70 is placed in the holding part 32, the cylinder 71 of its guide rod 70 front portions also places half-arc groove 31, returning spring 90 also props up in holding part 32 bottoms in addition, again packing ring 78 is penetrated cylinder 71 and be placed in the half-arc groove 31, vertically the circular recess 41 of press section 40 is aimed at again and inserted cylinder 71, and the flange 42 of press section 40 is also aimed in the rectangular channel 37 of inserting right shell body 30 and fit is fixed, last again with two lugs 23 at left shell 20 junction surfaces 25,24, cooperate and be plugged in two slots 361 at right shell body 30 junction surfaces 36, finish combination, and carbon brush 72 two ends on the guide rod 70 also are contacted with on the two carbon plate resistance 521 of control circuit board 50, and form complete continuous variable speed switch 10 assemblys.

As shown in Figure 4, be to be effect schematic diagram of the present utility model, wherein guide rod places once spring 90 again for 70 times, this is first years old, two conducting strips 34,35 appropriate location is buckled on respectively that the both sides of " Jiong " type frame 33 are protruding buckles 331, on 332, and this first, two conducting strips 34, the arc portion 343 of 35 upper ends, 353, also take respectively in length, short two hypotenuses 75, on 76, because of returning spring 90 can produce a back stretch that makes progress is arranged, make its two conducting strip 34,35 along with upwards effect of guide rod 70, and take advantage of a situation two connection springs 342,352 outwards pull, make two conducting strips 34,35 do not touch the conducting block 38 that is connected to power line, and fail conducting.

As shown in Figure 5, when push downwards press section 40, guide rod 70 is promptly to lower slider, because of the long hypotenuse 75 of guide rod 70 is not provided with a chimb 761, make the arc portion 343 of its first conducting strip 34 not be subjected to earlier guide rod 70 effects, and allow connection spring 342 produce a restoring force, make the salient point 341 of the conducting strip 34 of winning touch the salient point 383 of conducting block 38, and form conducting.

Fig. 7, shown in Figure 8 and for example, after the 34 contact conductings of first conducting strip, promptly can make control circuit 52 conductings, after control circuit 52 conductings, also be contacted with on the carbon plate resistance 521 by the carbon brush on the guide rod 70 72, can be along with the moving and semifixed resistor 522 effects and can determine the carbon plate resistance value of guide rod 70, and output voltage on can control circuit, make the speed of the rotating speed of motor 100 on its decision electric tool.

Again as shown in Figure 6, when all push downwards press section 40, then the arc portion 353 of second conducting strip 35 is not because of being subjected to guide rod 70 effects, make it connect spring 352 and produce a restoring force, and allow the salient point 351 of second conducting strip 35 touch the salient point 61 of L type conducting strip 60 and to form full conducting, and after rectification circuit 523 becomes direct current with AC rectification, trigger the SCR element and make the control circuit 52 at this moment can automatic short-circuit, make the motor 100 on its electric tool reach full rotating speed.

In sum, the size that continuous variable speed switch 10 provided by the utility model is pushed the application of force downwards according to press section 40 can be controlled the speed of motor 100 rotating speeds on the electric tool automatically, makes its convenience of promoting the user, truly has practical effect.

The diagram of above said content and illustrated embodiment only is a preferable enforcement example of the present utility model, knows the personage of this skill generally, and various variations and modification according to spirit of the present utility model makes must be included in the claim of this case.

Claims (4)

1, a kind of continuous variable speed switch is characterized in that: formed by the left and right housing in press section, guide rod and control circuit board, wherein:

Be provided with a circular recess in the middle of the rear portion of press section, one side appropriate location is provided with a flange, and this flange top is provided with a rectangular opening;

The front portion of left shell is provided with a half-arc groove, is provided with a holding part in it, places for control circuit board, and its junction surface is provided with two lugs, and below this lug, other is equipped with a L type conducting strip again, and this L type conducting strip end is provided with a salient point;

The front portion of right shell body is provided with a half-arc groove, its junction surface is provided with the corresponding slot of lug on the junction surface with left shell, be provided with a holding part in it, place for guide rod, be provided with a raised line in the middle of in this holding part, be equipped with one " Jiong " type frame on this raised line, respectively there are two protruding relatively buttons the appropriate location, both sides of being somebody's turn to do " Jiong " type frame, in order to buckle two conducting strips, this two conducting strips upper end is arc portion, and the lower end respectively is provided with a salient point, the bottom of this right shell body is provided with two conducting blocks, its outside is provided with a rectangular channel, and is provided with a circular groove on this rectangular channel in addition, for fit fixing button and spring;

The front portion of guide rod is a cylinder, the one side is provided with a slotted eye in order to be nested with carbon brush, Jie's type projection that one " Jie " font is arranged on its opposite side, should be provided with a sliding tray in the middle of " Jie " shape projection, the one side is to be long hypotenuse, and opposite side is for short hypotenuse, is provided with a chimb in addition on this weak point hypotenuse, in this guide rod bottom one pothole is arranged again, place for returning spring;

On the control circuit board, comprising having:

Carbon plate resistance by the resistance that two carbon plates are formed, is used for adjusting the magnitude of voltage of circuit output;

Semifixed resistor is to do the laser fine setting to the carbon plate thickness of carbon plate resistance, is used for assisting the action of carbon plate resistance;

Rectification circuit is made up of two rectifier diodes, is direct current with AC rectification;

Circuits for triggering are with the direct current after the rectification, make it trigger the SCR element;

Form a complete switch via above-mentioned each member,, can control the speed of motor speed on the electric tool automatically according to the size of pushing the application of force in the press section downwards.

2, continuous variable speed switch as claimed in claim 1, its feature have a hole respectively in the middle of two conducting blocks of described right shell body, insert for power line and also can utilize the screw locking.

3, continuous variable speed switch as claimed in claim 1, its feature are equipped with one respectively and connect spring in the appropriate location of described two conducting strips, its connection spring other end also is fixed on two projections of right shell body, replys action in order to two conducting strips.

4, continuous variable speed switch as claimed in claim 1, its feature is with a packing ring on the anterior cylinder of described guide rod, and makes on its half-arc groove that places right shell body, horizontally slips arbitrarily to prevent guide rod.

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