CN2314470Y

CN2314470Y - Safety switch with protective circuit

Info

Publication number: CN2314470Y
Application number: CN 97227840
Authority: CN
Inventors: 王明山
Original assignee: Individual
Current assignee: You Congmou
Priority date: 1997-09-29
Filing date: 1997-09-29
Publication date: 1999-04-14
Anticipated expiration: 2007-09-29

Abstract

The utility model relates to a safety switch with protective circuits, which comprises a switch main body, three lug plates, and a push-pull rod. A contact spring sheet is arranged on the center of a dish type doublet metal sheet. A gap part is arranged on the center of a positioning end. A free end is wider than the positioning end. A curve arc shape with bidirectional spring function is formed. A combination hole is arranged on the free end, and the push-pull rod is in the linkage of the combination hole. The upper end is sheathed in the longways pivot hole produced when pressing the lug of a pressing lampshade. A limit stop is arranged on the switch main body. The lampshade is pressed in the room temperature, and the doublet metal sheet is in a concave bidirectional spring state or a convex bidirectional spring state for an instant to achieve the on-off. The dish type doublet metal sheet has the reverse deformation and is in a totally trip or a semi strip state on the current overload or the lampshade malfunction, so the switch is in a continuous off state. The goal of safe power utilization can be achieved.

Description

Safety switch with protection circuit

The utility model relates to the electric switch in a kind of essential electronic element field; particularly relate to and a kind ofly do not need other additional elastic component and can when normal temperature, have two-way spring function, and have the safety switch that when power supply transships automatic escape can be guaranteed Electrical Safety with protection circuit.

See also shown in Figure 1, be existing general Illuminated Switch in indoor use, it is a kind of rocker switch, and it mainly is when utilizing briquetting 11 arbitrary ends to be pressed, the blocking projection 110 of its bottom makes it constitute path or off state ejection one shell fragment contact seesaw 12; But this structure is a passive switch structure, it is the power path or the conversion of opening circuit each time, all need cooperate a push action, otherwise channel status still is a path, does not therefore have automatic shifting function, so when being in channel status at switch, and electricity usage is when surpassing load, because of it does not have automatic escape function, the as easy as rolling off a log electric wire that causes cocks off, and therefore dangerous anxiety is arranged in the use.

Again, seeing also Fig. 2, shown in Figure 3, is that the patent No. is the main organigram of ZL922300682 patent case; It is the improvement of doing at above-mentioned defective, it mainly is the briquetting 21 that is pivoted in a combination housing 1 upper end, be provided with two set of connections sheets 3 respectively at the place, bottom again, 3 ', wherein a set of connections sheet 3 is provided with contact spring 25, and this contact spring 25 is provided with a platinum contact 251, these contact spring 25 1 ends are corresponding to another lug plate 3 ' top, and can contact with the platinum contact 31 on it and communicate, briquetting 21 1 bottom portions are provided with a double-action plate 23 again, double-action plate 23 end in addition is connected with in contact spring 25, when pushing briquetting 21, the lug plate 3 of two connection power lines will be made, 3 ' by contact spring 25 and

platinum contact

251,31 connect, when overload takes place power supply, the varicose degree of contact spring 25 changes because of temperature raises, and from the platinum contact 31 escape, make electric power disconnection, to guarantee Electrical Safety.

Though the more existing rocker switch of the switch of above-mentioned patent case has when power supply transships it to be opened circuit and reach safe effect, it still has following defective in the use:

One, pushed down or screens by external force when briquetting 21, or curved arc shell fragment 24 elastic fatigues, because of briquetting 21 and double-action plate 23 are continuous action relation, cause the contact spring 25 (pairing sheet metal) can't escape in when overload, this moment, temperature continued to rise, and then caused body to melt down, and dangerous anxiety.

Two, again, its manner of execution is to utilize the contact spring 25 that is made of the pairing sheet metal when overload, temperature rise is during to the escape temperature (generally being set at 100 ℃-150 ℃), its elastic force is greater than curved arc shell fragment 24, promptly move to the OFF state, this moment is when being pressed into conducting ON state with briquetting 21, if the elasticity of this contact spring 25 still greater than curved arc shell fragment 24, then skips to the OFF state again after

platinum contact

251,31 contacts immediately; This moment is if use the strong briquetting 21 of hand, though then

platinum contact

251,31 contacts, but contact spring 25 loses effect, and temperature continue to rise, and the contact of

platinum contact

251,31 is the strength of hand therefore the time again, if because of strength is used uneven, therefore the time load is arranged, loose contact again then can cause pyrophoric behavio(u)r during contact, so

platinum contact

251,31 very easily oxidations cause its life-span to reduce.

Three, in addition this contact spring 25 be a planar configuration, only has unidirectional distortion function, so must utilize this arc spring lamination 24 to reach the function of two-way moment escape; Yet this curved arc shell fragment 24 is by metal stamping formed, and the elastic force after its each bending tablet moulding is difficult to consistent, has the defective that causes elastic force excessive or too small easily, when elastic force is excessive, easily make the contact spring 25 can't escape, cause temperature to continue to rise in when overload, and dangerous anxiety; Again when elastic force is too small, then easily cause contact spring 25 loosening, make the platinum contact 251 on it contact defective tightness, and cause easily spark and reduction useful life with another platinum contact 31.

See also shown in Figure 4ly, be a kind of structural map of existing contact spring 7 ' moulding, it is to utilize punching press to be the type when making, and makes its moulding.The escape distortion is it and opens circuit when utilizing its current overload temperature rise, then returns back to original state when temperature descends.But the contact spring 7 ' of this dish-like pairing sheet metal that utilizes the punch forming mode and make only has the function of unidirectional escape, because of having destroyed its inner stress structure, thereby has reduced useful life, and the accuracy of its Tripping Current is reduced.

Because the drawback that above-mentioned existing switch exists, the design people is based on abundant practical experience and professional knowledge, through constantly studying, design, and after studying sample repeatedly and improving, creates the utility model finally.

Main purpose of the present utility model is; overcome the defective of existing switch; and provide a kind of safety switch of new structure with protection circuit; make dish-like pairing sheet metal wherein get rid of the mode that existing switch punching press is out of shape; utilize the condensation assembling structure to make it form bent radian naturally; and has the effect of two-way escape; and do not destroy its inner stress structure; can improve useful life; and can accurately utilize V=IR and W=VA formula to set the amperage of overload current; the defective products rate of product can be reduced, and the accuracy of overload trip electric current can be improved.

Another purpose of the present utility model is; a kind of safety switch with protection circuit is provided; make it on the free end of dish-like pairing sheet metal, be provided with combined hole; can make up and interlock with a pull bar; by the effect that pushes away or draw; make dish-like pairing sheet metal become recessed or protruding body by two-way escape, can reach the purpose of path (ON) or open circuit (OFF), and have the effect of simplifying member and reducing cost.

Another purpose of the present utility model is; a kind of safety switch with protection circuit is provided; make it utilize the bounce space Δ S portion of this pull bar on push-press lamp cover; make when push-press lamp cover because of external force or break down can't move the time; also can make dish-like pairing sheet metal do the distortion of half escape; switch is continue to open circuit (OFF) state, and can guarantees safety.

The purpose of this utility model is realized by following technical scheme.According to the safety switch with protection circuit that the utility model proposes, it mainly comprises: a Switch main body, and it generally is the square box of a hollow, and is pivoted with a push-press lamp cover in the upper surface, and other its and arranged on left and right sides is provided with the elasticity blocking and colludes; Three lug plates, wherein the power line two ends are connected to the first, the 3rd lug plate, and its top of first lug plate forms the bending body, be installed with a platinum contact on this bending body, and its top of second lug plate also is formed with the bending body, this bending body top connects a dish-like pairing sheet metal, and this dish-like pairing sheet metal below is with respect to the platinum contact on first lug plate, also be installed with a platinum contact, the 3rd lug plate in addition, it connects a resistance with a conductor wire; One neon lamp is arranged at the below of push-press lamp cover, and is provided with to be located at intrinsic some projections location, its two conductor wire is connected with the resistance and second lug plate respectively, when first, second lug plate communicates and during energized, then neon lamp is shinny, show to be conducting state; One pull bar, its upper end laterally form a bending body, embed one and are located at the lug that the push-press lamp cover inner edge protrudes out, and be pin-jointed structure, and its bottom then is arranged at the free-ended combined hole of aforementioned dish-like pairing sheet metal; Be primarily characterized in that: this dish-like pairing sheet metal, be provided with a contact flat spring by free end to the positioning end extension on its median plane, the tail end of this contact flat spring is reserved with one for the fixing through hole of aforementioned platinum contact, and in cutting one appropriate gap portion of positioning end central authorities, and be respectively equipped with location hole at the positioning end of these clearance portion both sides, this positioning end forms the free end broad and the narrower structure of positioning end to the clearance portion closing, forms a shape naturally like dish-like bending arc shape with its internal stress; Whereby, make it not need other additional elastic component and can when normal temperature, have the function of two-way spring; Moreover the free end of this dish-like pairing sheet metal is provided with a combined hole; This pull bar, body is colluded for being bent in its bottom, and wears the interlock setting with the combination of aforesaid combined hole, and the upper end of pull bar also is bent into button, is inserted in the lug of push-press lamp cover, and is pin-jointed structure; Aforesaid lug, its pivoted hole be for being longitudinally elongated shape, and form a bounce space Δ S portion that is shifted up and down for button; This Switch main body, suitable height above the reverse relative position of the platinum contact of pairing sheet metal and the first lug plate platinum contact is provided with a block; Combined by above-mentioned member, have when normal temperature and make the effect of pull bar because of pushing away or drawing via push-press lamp cover, make dish-like pairing sheet metal be recessed or protruding two-way escape function of moment, and the purpose that reaches path or open circuit; And at current overload or when lampshade breaks down, dish-like pairing sheet metal can be the distortion of full escape or half escape by temperature rise moment reversal deformation, and then the contact of its central contact flat spring is separated, switch is presented continue to open circuit (OFF) state, can reach the effect of Electrical Safety.

The purpose of this utility model can also further realize by following technical measures.

Aforesaid safety switch with protection circuit, wherein said push-press lamp cover can make into the lampshade of passing structural formula, and the button that the lampshade of this passing structural formula also is provided with pivoted hole and pull bar upper end is articulated.

Aforesaid safety switch with protection circuit, wherein said Switch main body its can be directly and socket be shaped to one, or be made for the switch that the constant nothing of overall structure is held the silk structure separately.

The utility model compared with prior art has tangible advantage and good effect.By above technical scheme as can be known, the utlity model has the safety switch of protection circuit, it comprises: Switch main body; Three lug plates, wherein a lug plate is provided with platinum contact, sets firmly a dish-like pairing sheet metal with platinum contact on the lug plate and have in addition; And one upper end and push-press lamp cover articulate, and the lower end is passed the pull bar of pairing sheet metal free end combined hole and is constituted; It is characterized in that: this dish-like pairing sheet metal is a structure kenel of getting rid of the existing unidirectional escape of switch punch forming, utilize the condensation group to stand and make it form shape naturally like dish-like bent radian, and concavo-convex two-way moment spring changes and the effect of reversal deformation escape during the overload temperature rise when having normal temperature, because of not destroying its inner stress structure, can accurately set the amperage of overload current, the defective products rate of product can be reduced, and the accuracy of overload temperature rise escape can be improved.Moreover the reverse position of this dish-like pairing sheet metal platinum contact is provided with block, can prevent excessive bouncing distortion, and utilize this pull bar, in free-ended combined hole, because of the effect that pushes away or draw, and has concavo-convex two-way escape function, the purpose that can reach path or open circuit; And when push-press lamp cover because of external force or when breaking down, utilize pull bar when having a bounce space Δ S portion also can make dish-like pairing sheet metal on the lampshade, to be the distortion of half escape in overload, switch is continue to open circuit (OFF) state, can reach the effect of Electrical Safety.

In sum, dish-like pairing sheet metal of the present utility model has been got rid of the mode of existing switch punching press distortion, utilize the condensation assembling structure to make it form bent radian naturally, and has the effect of two-way escape, and do not destroy its inner stress structure, can improve useful life, and can set the amperage of overload current exactly, reduce the defective products rate of product, and can improve the accuracy of overload trip electric current; It is provided with combined hole on the free end of dish-like pairing sheet metal, the interlock with pull bar combination, make dish-like pairing sheet metal become recessed or protruding body by two-way escape by the effect that pushes away or draw, can reach the purpose of path (ON) or open circuit (OFF), and have the effect of simplifying member and reducing cost; It utilizes the bounce space Δ S portion of this pull bar on push-press lamp cover in addition, make when push-press lamp cover because of external force or break down can't move the time, also can make dish-like pairing sheet metal do the distortion of half escape, switch is continue to open circuit (OFF) state, and can guarantee safety.No matter it structurally or bigger improvement is all arranged on the function, and produced handy and practical effect, and have the effect of enhancement really, thereby be suitable for practicality more, really is a new and innovative, progressive, practical new design.

Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the organigram of existing rocker switch.

Fig. 2 is the switch structure schematic diagram one of ZL922300682 patent case.

Fig. 3 is the switch structure schematic diagram two of ZL922300682 patent case.

Fig. 4 is the formation structure stereogram of existing contact spring.

Fig. 5 is the exploded perspective view of the utility model preferred embodiment.

Fig. 6 is the organigram of the utility model preferred embodiment at the ON state.

Fig. 7 is the organigram of the utility model preferred embodiment at the OFF state.

Fig. 8 is the structural plan schematic diagram one of the pairing sheet metal of the utility model preferred embodiment.

Fig. 9 is the structural plan schematic diagram two of the pairing sheet metal of the utility model preferred embodiment.

Figure 10 is the stereogram of the pairing sheet metal combination back of the utility model preferred embodiment at the ON state.

Figure 11 is the stereogram of the pairing sheet metal combination back of the utility model preferred embodiment at the OFF state.

Figure 12 is the structural representation of the main member of the utility model preferred embodiment from ON → OFF state.

Figure 13 is the structural representation that the pairing sheet metal of the utility model preferred embodiment is half escape state.

Figure 14 is the cross-sectional schematic of A-A section among Figure 13.

Figure 15 is the cross-sectional schematic of B-B section among Figure 13.

Figure 16 is the section of structure of another possible embodiments of the utility model.

Figure 17 is the temperature rise comparison diagram of the utility model and existing switch.

Below in conjunction with accompanying drawing and preferred embodiment, to according to its concrete structure of the safety switch with protection circuit, feature and the effect thereof that the utility model proposes, describe in detail as after.

At first see also Fig. 5 to shown in Figure 11, the utlity model has the safety switch of protection circuit, it mainly comprises:

One Switch main body 3, it generally is the square box of a hollow, and is pivoted with a push-press lamp cover 31 in the upper surface, and its and arranged on left and right sides is provided with the elasticity blocking and colludes 32 in addition;

Three

lug plates

4,5,6, wherein, the two ends of power line (not shown) are connected to the first, the

3rd lug plate

4,6, and first lug plate, 4 its tops form bending body 41, set firmly a platinum contact 42 on this bending body 41, and second lug plate, 5 its tops also are formed with bending body 51, these bending body 51 tops connect a dish-like pairing sheet metal 7, and these dish-like pairing sheet metal 7 belows are with respect to the platinum contact 42 on first lug plate 4, also be installed with a platinum contact 71, the 3rd lug plate 6 in addition, it utilizes a conductor wire 61 to connect a resistance 62;

One neon lamp 8, be arranged at push-press lamp cover 31 belows, and some projections 33 setting of locating in the body 3 is located in utilization, its two

conductor wire

81,82 is connected with the resistance 62 and second lug plate 5 respectively, when first,

second lug plate

4,5 communicates and during energized, then neon lamp 8 is shinny, is the state of conducting with demonstration;

One pull bar 9, its upper end laterally form a bending body 91, and can embed one and be located at the lug 34 of push-press lamp cover 31 inner edges, and be the pivot joint state, but its bottom aforesaid dish-like pairing sheet metal 7 free-ended combined holes of push-and-pull then; It is characterized in that:

See also shown in Figure 8, this dish-like pairing sheet metal 7, be provided with a contact flat spring 72 by free end to the positioning end extension on its median plane, the tail end of this contact flat spring 72 is reserved with a through hole 721 and fixes for aforementioned platinum contact 71, and a T1 of appropriate gap portion cuts in central authorities at positioning end, and is respectively equipped with location hole 73 at the positioning end of clearance portion T1 both sides; Please then consult shown in Figure 8ly, to clearance portion T1 closing, make it dwindle into width W 2 by original width W 1 positioning end, this moment should dish-like pairing sheet metal 7 formation free end broads and the narrower structure kenel of positioning end;

See also shown in Figure 10ly, location hole 73 condensations of the positioning end of dish-like pairing sheet metal 7 are fixed on the bending body 51 salient point rivets 74 of second lug plate 5; Thin sheet metal constitutes because this dish-like pairing sheet metal 7 is served as reasons, and the clearance portion T2 that contact flat spring 72 its both sides of central authorities and tail end three faces are all sky, so, when the positioning end condensation of pairing sheet metal 7 is less width W 2, making it form a shape naturally like dish-like bending arc shape by its internal stress, is that contact spring 25 utilizes the punching press distortion to make it be the mode of unidirectional bending arc shape to replace existing pairing sheet metal.And this frame mode of pairing sheet metal one end condensation that utilizes makes the structure of its shaping, because be not subjected to mechanical punching press distortion, so the bending degree of its default current overload temperature rise can not changed; And the dish-like pairing sheet metal 7 of this that it constituted, by setting the proper proportion of this free-ended width W 1 with the width W 2 of positioning end, then make it have the function that two-way spring changes, be that it can be as shown in figure 10, be rendered as the spill state, and when this dish-like pairing sheet metal 7 was spill, this contact flat spring 72 then was the state that downward bullet is stretched naturally by mechanics principle.Otherwise, when dish-like pairing sheet metal 7 is that then this contact flat spring 72 converts the state that upsprings and stretch naturally to, so as to the position of platinum contact 71 set on mobile contact flat spring 72 tail ends when being rendered as the convex arc state shown in 11; Moreover the free end of this dish-like pairing sheet metal 7 is provided with a combined hole 75;

This pull bar 9, body 91 is colluded for being bent in its bottom, and can wear interlock with 75 combinations of aforesaid combined hole, and the upper end of pull bar 9 also is bent into button 92, and can be inserted in the pivoted hole 341 of lug 34 of push-press lamp cover 31, and is the pivot joint state;

Aforesaid lug 34, its pivoted hole 341 be for being longitudinally elongated shape (as shown in Figure 6), and form a bounce space Δ S portion that is shifted up and down for button 92; And

This Switch main body 3, suitable height above the reverse relative position of the platinum contact 71 of pairing sheet metal and first lug plate, 4 platinum contacts 42 is provided with a block 35 (as shown in Figure 6);

Combined by above-mentioned member, when it has current overload, this dish-like pairing sheet metal 7 moment automatic reverse distortion, and make its central contact flat spring 72 escapes, and present (OFF) state that continues to open circuit, can reach the effect of Electrical Safety.

The utility model is by above-mentioned structure, and the enforcement state of its integral body and the enhancement effect that can obtain thereof illustrate as the back now more one by one:

See also Fig. 6 to shown in Figure 12, when push-press lamp cover 31 is pushed to the right, the free end of this dish-like pairing sheet metal 7 is for upwards being driven by the body 91 that colludes of pull bar 9 bottoms, when the free end of dish-like pairing sheet metal 7 rises gradually, make the connecting portion 722 of contact flat spring 72 reach bent arc and change when critical that then escape is concavity moment, and contact flat spring 72 is bounced downwards, make its platinum contact 71 contact conducting with the platinum contact 42 of first lug plate 4, this moment, neon lamp 8 was shinny, to show conducting state.

See also Fig. 7 and shown in Figure 13, when push-press lamp cover 31 is pushed left, these lug 34 beginnings are to bottom offset, but pivoted hole 341 is provided with a bounce space Δ S portion, so after must waiting this lug 34 to move down the height of a Δ S, just can utilize the upper limb face of its pivoted hole 341 to make the button 92 of pull bar 9 stressed and move down, this moment, the free end of dish-like pairing sheet metal 7 was also pushed downwards by the body 91 that colludes of pull bar 9, when dish-like pairing sheet metal 7 is displaced downwardly to bent arc gradually and changes critical point, then escape is convex moment, and contact flat spring 72 is popped up, the platinum contact 42 of the platinum contact point 71 and first lug plate 4 is separated, this moment, neon lamp 8 extinguished, and was (OFF) state that opens circuit with demonstration.

Therefore, when push-press lamp cover 31 is pushed left, its lug 34 is for moving a height L1, but pull bar 9 is because of the height of deduction bounce space Δ S, therefore its actual L2 height that moves also makes the free end travel L2 height of dish-like pairing sheet metal 7, and this L2 highly, just be enough to make it to be convex, and presenting off state by the concavity escape; Again, when contact flat spring 72 pops up, platinum contact 71 on it promptly separates with relative platinum contact 42, and the height that upwards bounces up for fear of this contact flat spring 72 is too big, and easily cause elastic fatigue, 35 of blocks that therefore are positioned at the top that a limitation function just can be provided, to guarantee its useful life, and can improve and push texture, produce audio.And this block 35 also can design and change a platinum contact into, makes it become a kind of change over switch.

Aforesaid dish-like pairing sheet metal 7 is that two kinds of different sheet metals of the hot retractility of chance are harmonious it through forging, when electric current passes through, the resistance value that has by sheet metal, use the principle mode of V=IR and W=VA, be set at the dish-like pairing sheet metal 7 of arcs of recesses (ON) when making normal temperature, when electrorheological ambassador temperature rose, Yin Gaowen changed its surperficial varicose degree, and can make its distortion escape.The principle of this pairing sheet metal is a prior art, has been disclosed use, and really can reach the expection effect, so do not repeat them here.

The utility model utilization aforementioned principles, and by the ingenious utilization of the condensation assembling structure and the pull bar 9 of two-way dish-like pairing sheet metal 7, and can improve the defective of existing switch.The front that is configured in of the dish-like pairing sheet metal 7 of this reversible is described in detail, so no longer repeat.

See also shown in Figure 12, be use situation of the present utility model, this dish-like pairing sheet metal 7 can become convex by the arcs of recesses escape because of when the current overload, make contact flat spring 72 upspring from bottom to top, and then two

platinum contacts

71,42 are separated and be (OFF) state that opens circuit; Owing to dish-like pairing sheet metal 7 of the present utility model is to utilize an end to close up to make it be curvature; therefore be not subjected to mechanical punching press distortion; so the amperage of the current loading that it is default has the stable characteristic accurately that reaches; automatic escape when its temperature rises to the escape design temperature can reach the effect of protection circuit really.The more important thing is, when dish-like pairing sheet metal 7 of the present utility model breaks down and can't move at push-press lamp cover 31, then dish-like pairing sheet metal 7 also can be made half escape, to guarantee Electrical Safety, and why the utility model can obtain so effect, be because the pull bar 9 of this dish-like pairing sheet metal 7 is not to become to engage or the fixed structure relation with lug 34, see also Figure 13, Figure 14, shown in Figure 15, the utility model is when being conducting (ON) state, this lug 34 is upwards and utilizes the bottom drawing pull bar 9 of its pivoted hole 341, make dish-like pairing sheet metal 7 laterally and vertically all distortion be concave arc shape (shown in dotted line), the contact flat spring 72 downward bullets of central authorities stretched and made platinum contact 71 platinum contact relative 42 contact conductings with another; But when push-press lamp cover 31 or pull bar 9 break down and can not be to bottom offsets, though this dish-like pairing sheet metal 7 laterally can not bounce downwards, but its free end is not fixed by the pull bar 9 of lug 34, bounce space Δ S portion by this pivoted hole 341, the function that vertically still can maintain its surperficial varicose degree of this dish-like pairing sheet metal 7 then because of high temperature changes, become convex by the arcs of recesses escape, all, contact flat spring 72 pops up so that being the state of half escape, platinum contact 71 platinum contact relative with another 42 separated, and present (OFF) state that opens circuit, to reach Electrical Safety.And existing safety switch is to utilize curved arc shell fragment 24, because of its briquetting 21 and double-action plate 23 and platinum contact 251 interlocks, can't utilize the contact flat spring 25 buffering areas distortion of pairing sheet, so can only make full escape, can't reach the effect of half escape.

See also shown in Figure 16, be another possible embodiments of the utility model, it is that push-press lamp cover is made into passing formula lampshade 31 ', this passing formula lampshade 31 ' also utilizes its pivoted hole 341 and the button 92 of pull bar 9 upper ends to be articulated, left and right displacement by the formula of passing lampshade 31 ', reach ON ← → function of OFF, and utilize the bounce space Δ S portion of pivoted hole 341, still can make contact flat spring 72 have the function of half escape; Because of itself and previous embodiment have the effect that equates, so do not give unnecessary details.

See also shown in Figure 17 (a), for in the ZL922300682 patent case when the break down schematic diagram of contact spring 25 its load current temperature rise can't escape time of its switch, its can along with the time chien shih temperature continue to rise, burn switch and dangerous anxiety and have, and the applicant is at the switch of No. 95217469.3 patents of Patent Office of the People's Republic of China's application, when its catch can't promote and during current overload, this pairing sheet metal is an escape, but when temperature descends, the pairing sheet metal rebound original position again of this unidirectional escape function continues conducting (ON), so the temperature rise of switch is shown in Figure 17 (b), be rendered as rising (escape) state that (contact) more constantly repeat that descends again, though so when heating up overload automatically escape be and open circuit, but the contact that repetitiousness covers is influential for the life-span of electrical home appliances, and but dish-like pairing sheet metal 7 of the present utility model is the double-deformation escape, be that it can be spill and also can be the convex state, and it is extremely shown in Figure 15 as Figure 13, when making contact flat spring 72 be half escape because of temperature rise is too high, this dish-like pairing sheet metal 7 opens circuit after (OFF), though the laterally not distortion of this dish-like pairing sheet metal 7, but it vertically becomes convex by spill, and its distortion curvature has surpassed horizontal line, according to material mechanics principle, after dish-like pairing sheet metal 7 temperature descend, can not become again yet and be spill, when so the utility model breaks down at switch, this temperature rise is shown in Figure 17 (c), automatic escape when reaching load current high temperature, even temperature descends, unless and after fixing a breakdown, otherwise this switch can not contact use automatically again; Therefore, it has the effect that can guarantee that switch can not burn than the variation diagram shown in Figure 17 (a); And, then do not have repetitiousness and cover to be and open circuit and path and influence the electrical equipment defective in useful life than the variation diagram shown in Figure 17 (b); Therefore the utility model has safety really and promotes the household electrical appliances effect in useful life.

Can be known by above embodiment and to learn that the utility model is except promoting safety function, its spare part is more simplified than existing switch of the same type, and also comparatively convenient in the assembling, has more the value of industry.

The above safety switch that discloses, it is a separate state, generally is to be installed on the socket, as the usefulness of protection circuit; Certainly, as needing based on industry, Switch main body 3 of the present utility model also can directly and socket be one-body molded or do not hold a switch use as having separately, and overall structure is constant, also is possible embodiments of the present utility model.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1, a kind of safety switch with protection circuit, it mainly comprises:

One Switch main body, it generally is a hollow square box, and is pivoted with a push-press lamp cover in the upper surface, and other its and arranged on left and right sides is provided with the elasticity blocking and colludes;

Three lug plates, wherein the power line two ends are connected to the first, the 3rd lug plate, and its top of first lug plate forms the bending body, be installed with a platinum contact on this bending body, and its top of second lug plate also is formed with the bending body, this bending body top connects a dish-like pairing sheet metal, and this dish-like pairing sheet metal below is with respect to the platinum contact on first lug plate, also be installed with a platinum contact, the 3rd lug plate in addition, it connects a resistance with a conductor wire;

One neon lamp is arranged at the below of push-press lamp cover, and is provided with to be located at intrinsic some projections location, and its two conductor wire is connected with the resistance and second lug plate respectively;

One pull bar, its upper end laterally form a bending body, embed one and are located at the lug that the push-press lamp cover inner edge protrudes out, and be pin-jointed structure, and its bottom then is arranged at the free-ended combined hole of aforementioned dish-like pairing sheet metal;

It is characterized in that:

This dish-like pairing sheet metal, be provided with a contact flat spring by free end to the positioning end extension on its median plane, the tail end of this contact flat spring is reserved with one for the fixing through hole of aforementioned platinum contact, and in cutting one appropriate gap portion of positioning end central authorities, and be respectively equipped with location hole at the positioning end of these clearance portion both sides, this positioning end forms the free end broad and the narrower structure of positioning end to the clearance portion closing, forms a shape naturally like dish-like bending arc shape with its internal stress; Moreover the free end of this dish-like pairing sheet metal is provided with a combined hole;

This pull bar, body is colluded for being bent in its bottom, and wears the interlock setting with the combination of aforesaid combined hole, and the upper end of pull bar also is bent into button, is inserted in the lug of push-press lamp cover, and is pin-jointed structure;

Aforesaid lug, its pivoted hole be for being longitudinally elongated shape, and form a bounce space Δ S portion that is shifted up and down for button;

This Switch main body, suitable height above the reverse relative position of the platinum contact of pairing sheet metal and the first lug plate platinum contact is provided with a block.

2, the safety switch with protection circuit according to claim 1 is characterized in that described push-press lamp cover can make into the lampshade of passing structural formula, and the button that the lampshade of this passing structural formula also is provided with pivoted hole and pull bar upper end is articulated.

3, the safety switch with protection circuit according to claim 1 and 2, it is characterized in that described Switch main body its can be directly and socket be shaped to one, or be made for the switch that the constant nothing of overall structure is held the silk structure separately.