CN2447931Y

CN2447931Y - Safety switch with protective circuit

Info

Publication number: CN2447931Y
Application number: CN 00243066
Authority: CN
Inventors: 王明山
Original assignee: YOU CONGMO
Current assignee: YOU CONGMO
Priority date: 2000-07-14
Filing date: 2000-07-14
Publication date: 2001-09-12
Anticipated expiration: 2010-07-14

Abstract

The utility model relates to a safety switch with protective circuits, which mainly comprises a switch main body, a lug plate, a conducting strip and a push-and-pull rod. The upper end of the push-and-pull rod is pivoted with the inner edges of a switching button, and the lower end is provided with a push and a pull bodies which can push and pull a free end of the conducting strip; meanwhile, the switching of on and off is realized by that a first and a second springs, and a backlash groove are matched. Under the state of switching on, the conducting strip is in the state of collapse and evasion; when temperatures and the deformation of the conducting strip is risen up because of the overload, the conducting strip can not bear the temperatures, the utility model can deform and escape in an off state, and a power supply is immediately cut off, and the safety in utilizing electric energy is ensured. The utility model has the advantages of simple structure and high safety.

Description

Safety switch with protective circuit

The utility model relates to a kind of diverter switch with protective circuit, particularly relates to a kind of pull bar that utilizes and cooperates spring and the safety switch of play groove push-and-pull conducting strip to realize switching.

Press, as shown in Figure 1, the lamp switch of general indoor use is a kind of rocker switch, and when mainly utilizing any end of briquetting (or claim switch bar) 11 to be pressed, the blocking projection 110 of its bottom makes it to constitute path or off state with ejection seesaw 12.Obviously, this construction of switch is a kind of passive construction of switch, and power path each time or the conversion of opening circuit all must be implemented a push action, otherwise circuit state will be kept.Therefore, be in channel status when switch and during the power supply excess load, can not automatically switch, thereby very easily cause electric wire to cock off, become potential safety hazard.

Shown in Fig. 2 A and Fig. 2 B, be the switch that improves design at above-mentioned defective with protective circuit; A briquetting 13 mainly is pivoted in combination housing 10 upper ends, set up three set of

connections sheets

15,16,17 separately in the bottom, wherein lug plate 17 is provided with contact spring 170, contact spring 170 is provided with platinum contact 171, and an end of contact spring 170 also can contact with platinum contact on it 160 corresponding to the top of lug plate 16; The bottom of briquetting 13 1 ends is provided with a double-action plate 14, the end in addition of double-action plate 14 is connected with contact spring 170, when pressing lower lock block 13, connect by contact spring 170 and platinum contact 171,160 making the

lug plate

16,17 that connects power supply, when overload appears in power supply, the varicose degree of contact spring 170 changes because of temperature raises and from platinum contact point 160 escapes, makes electric power disconnection, to guarantee Electrical Safety.

Compare with existing rocker switch,, still have following defective in actual use though above-mentioned switch with protective circuit has the effect of overload cut out:

1, pushed down or screens by external force when briquetting 13, or during curved arc shell fragment 18 elastic fatigues, will make the contact spring 170 (bimetal leaf) can't be from platinum contact 160 escapes when overload, this moment, temperature continues to rise, and then caused the body dangerous anxiety that melts down.

2, the operation principle of above-mentioned protective circuit is, during to " escape temperature " (generally being set at 100-150 ℃), its elastic force will promptly move to " disconnection " greater than curved arc shell fragment 18 contact spring 170 that is made of bimetal leaf because of the overload temperature rise.Be pressed into " conducting " state with briquetting 13 this moment, if the elasticity of contact spring 170 is still greater than curved arc shell fragment 18, then skip to " disconnection " state again immediately behind the platinum contact 171 contact platinum contacts 160, if this moment is with the strong briquetting 13 of hand, though then platinum contact 171,160 contacts, contact spring 170 loses effect, if push application of force inequality, easily cause spark when then contacting, very easily oxidation and reducing useful life of platinum contact 171,160.

Therefore 3, contact spring 170 is a planar configuration, and unidirectional escape function is only arranged, and must utilize arc spring lamination 18 to realize two-way moment escape.But curved arc elasticity 18 is by metal stamping formed, and the elastic force after the brake forming is difficult to consistent, easily causes elastic force excessive or too small.When elastic force is excessive, easily make the contact spring 170 can't escape in when overload; And when elastic force is too small, easily cause contact spring 170 loosening again, make the platinum contact 171 on it cause spark with platinum contact 160 loose contacts, reduce its useful life.

Shown in Fig. 3 A and Fig. 3 B; be at the defective of rocker switch and improve the switch that the another kind of design has protective circuit; its switch bar 20 1 ends are provided with insulation actuator 21 and connector 22, and connector 22 1 sides folder is established guide card 23 1 ends, and insulation actuator 21 1 ends connect an elastic component 24.When current overload, guide card 23 distortion escape contacts.Insulation actuator 21 is blocked the galvanic circle to arc groove 25 location.Yet there is above-mentioned defective equally in this switch with protective circuit, promptly when arbitrary element breaks down in switch bar 20, insulation actuator 21 and the connector 22, all will make the guide card 23 can't escape when overload.Moreover elastic component 24 is by the metal wire cans, and elastic force is difficult to consistent, equally easily causes elastic force excessive or little, therefore, and also non-perfect, safe switch.

The purpose of this utility model promptly is to provide a kind of safety switch with protective circuit simple in structure, safe in utilization.

To achieve these goals, the utility model utilizes Switch main body, lug plate, conducting strip and pull bar to constitute a kind of safety switch with protective circuit.The upper end of pull bar is articulated in the inner edge of switch bar, and its lower end is provided with and is used for that the push-and-pull conducting strip is free-ended to be pushed away body and draw body; The appropriate location of Switch main body is respectively equipped with first, second spring and the play groove of working in coordination with pull bar.

Like this safety switch that constitutes makes by the operation switch bar and to move on the pull bar or to move down, and can make conducting strip reversal deformation escape, and then realizes the switching of " conducting " and " opening circuit "; Under the conducting state, conducting strip is can collapse the escape state, when conducting strip because of the overload temperature rise when being out of shape the escape temperature, the deformability escape is to off state.

Be described in further detail below in conjunction with the technical characterictic of specific embodiment the safety switch that the utlity model has protective circuit.

Fig. 1 is the structural representation of existing rocker switch;

Fig. 2 A and Fig. 2 B are a kind of construction of switch schematic diagram with protective circuit;

Fig. 3 A and Fig. 3 B are another kind of construction of switch schematic diagram with protective circuit;

Fig. 4 is the exploded perspective view that the utlity model has the safety switch of protective circuit;

Fig. 5 and Fig. 5 A are the safety switch conducting state schematic diagram that the utlity model has protective circuit;

Fig. 6 and Fig. 6 A are the safety switch off state schematic diagram that the utlity model has protective circuit;

Fig. 7 is another embodiment exploded perspective view of safety switch that the utlity model has protective circuit;

Fig. 8 and Fig. 8 A are another embodiment conducting state schematic diagram of safety switch that the utlity model has protective circuit;

Fig. 9 and Fig. 9 A are another embodiment off state schematic diagram of safety switch that the utlity model has protective circuit.

With reference to figure 4, Fig. 5 and shown in Figure 6, the safety switch that the utlity model has protective circuit mainly comprises Switch main body 3, lug plate 4,5,6, conducting strip 7 and pull bar 8.

Switch main body 3 is the hollow square box, its upper surface is pivoted with switch bar 31, its left and right sides is provided with elasticity blocking hook 32, its sidewall 33 book offices are provided with play groove 34, be provided with first spring 35 that can contact pull bar acting surface 83 from inside to outside corresponding to initial point position (conducting state) on the pull bar 8, corresponding to 8 times initial point positions of pull bar (off-state) but lateral surface be provided with ecto-entad and contact second spring 36 that pull bar 8 draws body 86.

First lug plate, 4 tops form bending body 41, are installed with platinum contact 42 on this bending body 41; Second lug plate, 5 tops also form bending body 51, and these bending body 51 tops connect the conducting strip 7 that is made of bimetal leaf, and conducting strip 7 belows are installed with platinum contact 71 corresponding to the platinum contact 42 of first lug plate 4, and the front end of conducting strip 7 is provided with body flange 72.

The upper end of pull bar 8 laterally forms axis body 81 and can embed in the lug 311 of being located at switch bar 31 inner edges and forms the pivot joint state, but the free end of its lower end push-and-pull conducting strip 7, axis body 81 belows form dead slot 82, and saturating dead slot 82 root edges form can be for pushing up the acting surface 83 of pulling; Acting surface 83 bottoms form a narrow and small clip slot 85, on the clip slot 85 corresponding to conducting strip 7 body flanges 72 places be provided with protrude out push away body 84, clip slot 85 root edges then are the flat body 86 that draws.

The safety switch that constitutes like this, when the conducting strip in the Switch main body 37 is conducting state, its leading section raises up, shown in Fig. 5 A, first spring, 35 little pushing tow pull bar 8 acting surfaces 83 of trying hard to recommend outwards abut in the play groove 34 pull bar 8 bottoms, utilize this differential seat angle and make the body flange 72 of conducting strip 7 break away from clip slots 85 but still be positioned to push away body 84 belows, therefore, during as pull bar 8 action downwards, still can utilize to push away body 84 and promote the reverse escape of conducting strips 7 distortion and become off state.When conducting strip 7 because of the overload temperature rise when being out of shape the escape temperature, because of the outer end of conducting strip 7 links with pull bar 8, therefore can be collapse formula distortion escape and make electric power disconnection, to guarantee Electrical Safety.

Moreover, after conducting strip 7 is because of collapse formula distortion escape, only need switch bar 31 is pushed to the right, this moment, pull bar 8 bottoms broke away from play groove 34 to the bottom offset and second spring 36 of conflicting, the acting surface 83 of pull bar 8 breaks away from first spring 35 simultaneously, first spring 35 is positioned on the dead slot 82, shown in Fig. 6 and Fig. 6 A.At this moment, first spring 35 no longer contacts ejection acting surface 83, second spring 36 then ecto-entad ejection draws body 86, make the body flange 72 of conducting strip 7 embed in the clip slot 85, constitute continuous action relation with pull bar 8, that is when drawing on the pull bar 8, can force in conducting strip 7 by drawing body 86, make its distortion bounce into conducting state; And pull bar 8 is when top offset, first spring 35 can contact acting surface 83 again, shown in Fig. 5 A, make pull bar 8 be subjected to outside thrust, and to cooperate play groove 34 and make pull bar 8 serve as spool to be skewed, to make the body flange 72 of conducting strip 7 break away from clip slot 85 once more with axis body 81, presents overload and can collapse state.

Fig. 7-9 is depicted as another embodiment of the present utility model, and its main aufbauprinciple is identical with last embodiment, and its difference only is that the desired location of the sliding body length of pull bar 8 ＇ and direction and first spring, second spring and play groove is different.

Axis body 81 belows of pull bar 8 ＇ form dead slot 82, and saturating dead slot 82 root edges form the acting surface 83 that can pull for the top, and acting surface 83 1 sides form the weak point that vertically protrudes out and push away body 84 ＇ and longly draw body 86 ＇, and establish clip slot 85 ＇ in both links.

Sidewall 33 book offices of Switch main body 3 are provided with play groove 34, be provided with from inside to outside corresponding to the following initial point position (conducting state) of pull bar 8 ＇ that item touches long first spring 35 that draws body 86 ＇, corresponding to the last initial point position (off-state) of pull bar 8 ＇ but be provided with second spring 36 that ecto-entad contacts acting surface 83.

The structure of present embodiment and last embodiment has different song wonderful with it, and difference is that the conducting strip 7 in the present embodiment there is no body flange 72, and length draws body 86 ＇ and weak point pushes away body 84 ＇ and conducting strip 7 is vertical setting.Be located at the safety switch of conducting strip 7 outer ends for some platinum contact 71, can utilize the length of a slightly inclined to one side side to draw body 86 ＇ and shortly push away the switching that body 84 ＇ control conducting strip 7, required to meet industry.

The collapse formula escape of present embodiment, its action situation is similar to last embodiment, and only direction is opposite, shown in Fig. 8 and Fig. 8 A.When the conducting strip in the Switch main body 37 is conducting state, its leading section is out of shape downwards, this moment, first spring, 35 little top length of trying hard to recommend were drawn body 86 ＇, make the bottom of pull bar 8 ＇ outwards abut in the play groove 34, utilize this differential seat angle, make the outer end of conducting strip 7 break away from clip slot 85 ＇, but still be positioned at the long body 86 ＇ top of drawing, therefore move upward as pull bar 8 ＇, still can utilize length to draw body 86 ＇ upwards to spur the reverse escape of conducting strip 7 distortion and become off state.When conducting strip 7 because of the overload temperature rise when being out of shape the escape temperature, the outer end of conducting strip 7 also is limited by short body 84 ＇ that push away, and therefore can be collapse formula distortion escape and make electric power disconnection, to guarantee Electrical Safety.

Moreover, shown in Fig. 9 and Fig. 9 A, after conducting strip 7 is because of collapse formula distortion escape, only need switch bar 31 is pushed to the right, this moment, pull bar 8 ＇ bottoms broke away from play groove 34 to top offset, its acting surface 83 conflicts second spring 36, second spring, 36 ecto-entads are little to be tried hard to recommend pushing tow pull bar 8 ＇ and conducting strip 7 outer ends is embedded among clip slot 85 ＇, constitute relation with pull bar 8 ＇ interlocks, be that pull bar 8 ＇ are when pushing away downwards, utilize weak point to push away body 84 ＇ and force in conducting strip 7, and make its distortion escape become conducting state, and pull bar 8 ＇ are when bottom offset, second spring 36 will break away from acting surface 83, and first spring 35 will contact long body 86 ＇ that draw, shown in Fig. 8 A, make pull bar 8 ＇ bottoms be subjected to an outward thrust, and to cooperate play groove 34 and make pull bar 8 ＇ serve as spool to be skewed with axis body 81, make the outer end of conducting strip 7 break away from clip slot 85 ＇ once more, can collapse state when being overload.

Among above-mentioned two embodiment, conducting strip all is the state that can collapse when overload, be not subjected to the restriction that pushes away body or draw body of pull bar, but the reversal deformation escape is off state, and under the common state, still has the function of general diverter switch.

In sum, the utility model is simple in structure, safe, and it is required to meet industry development really fully, is to propose patent application in accordance with the law, earnestly asks the examination and approval early of an ancient unit of weight office.

Claims

1, a kind of safety switch with protective circuit is characterized in that comprising Switch main body, lug plate, conducting strip and pull bar; Described Switch main body is the hollow square box, its upper surface is pivoted with switch bar, both sides are provided with elasticity blocking hook, sidewall is provided with the play groove, last initial point position corresponding to pull bar is provided with first spring that can contact the pull bar acting surface from inside to outside, contacts second spring that pull bar draws body but be provided with ecto-entad corresponding to the lateral surface of initial point position under the pull bar; Described lug plate comprises first, second and the 3rd lug plate, first lug plate top forms the bending body and sets firmly a platinum contact, second lug plate top also forms the bending body, bending body top connects the conducting strip that is made of bimetal leaf, the conducting strip below also is provided with platinum contact corresponding to the first lug plate platinum contact, and the front end of conducting strip is provided with body flange; The upper end of described pull bar laterally forms axis body and embeds and is located in the lug of switch bar inner edge, its bottom and conducting strip free end are worked in coordination, the axis body below forms saturating dead slot, saturating dead slot root edge forms can be for pushing up the acting surface of pulling, the acting surface bottom forms clip slot, the clip slot top is provided with the body that pushes away that protrudes out corresponding to conducting strip body flange place, and the clip slot root edge is the flat body that draws.

2, a kind of safety switch with protective circuit is characterized in that comprising Switch main body, lug plate, conducting strip and pull bar; Described Switch main body is the hollow square box, its upper surface is pivoted with switch bar, both sides are provided with elasticity blocking hook, sidewall is provided with the play groove, be provided with corresponding to initial point position under the pull bar and can contact first spring that pull bar length is drawn body from inside to outside, but be provided with second spring that ecto-entad contacts the pull bar acting surface corresponding to initial point position on the pull bar; Described lug plate comprises first, second and the 3rd lug plate, first lug plate top forms the bending body, set firmly a platinum contact on the bending body, second lug plate top also forms the bending body, bending body top connects the conducting strip that is made of bimetal leaf, and the conducting strip below is installed with a platinum contact corresponding to the first lug plate platinum contact; The upper end of described pull bar laterally forms an axis body and embeds and is located in the lug of switch bar inner edge, its bottom and conducting strip free end are worked in coordination, the axis body below forms saturating dead slot, saturating dead slot root edge forms can be for pushing up the acting surface of pulling, acting surface one side forms the weak point that vertically protrudes out and pushes away body and the long body that draws, and the short body that pushes away draws the link of body to be provided with a clip slot with long.