CN216749692U - Switch for large current electric tool - Google Patents

Abstract

The utility model discloses a high-current electric tool switch, which structurally comprises a shell, a bracket terminal, a static contact piece terminal, a positive terminal, a reversing assembly, a trigger assembly, a conductive connecting bridge, a reversing rod and the like, wherein the conductive connecting bridge is rotationally assembled on a conductive rod through arc contact, so that the heating generated in the contact area of the conductive connecting bridge is reduced, the temperature rise is reduced, meanwhile, a quick on-off bulge is additionally arranged on the outer surface of the middle part of the conductive connecting bridge, and elastic seats are arranged on two sides of the conductive connecting bridge for structural cooperation so as to realize quick on-off, rebound prevention and arc pulling prevention between the conductive connecting bridge and the static contact piece terminal; in addition, the reversing rod drives the reversing rotary disc to rotate in the reversing bottom shell in a reciprocating mode for double positioning, looseness caused by impact and vibration of a motor terminal in actual use can be reduced, the situations of electric arc ignition, heating, melting, deformation, failure and the like generated when the reversing assembly is used can be avoided, and therefore the use reliability and the service life of the high-current electric tool switch are better guaranteed.

Description

Large-current electric tool switch

Technical Field

The utility model relates to an electric tool switch, in particular to a high-current electric tool switch.

Background

Along with the power demand of the complete machine of the tool on the market is higher and higher, the current-carrying requirement on the switch of the electric tool is higher and higher, and the current application of the current of the common electric tool switch is limited due to the current-carrying structural design, local heating temperature rise and the like. Firstly, the main switch structure design form of the existing electric tool switch is mainly a tension spring type structure and a bullet type structure, and the contact parts of the corresponding bracket terminal and the conductive connecting bridge are formed by stamping process, so that local concentrated heating is easily generated in the contact area of the bracket terminal and the conductive connecting bridge in the process of switch on or switch off, and the switch temperature rise is too high; secondly, the problems of quick on-off of the existing speed regulating switch, rebound prevention between a moving contact and a static contact, arc discharge prevention and the like are difficult to solve by the bullet structure of the existing speed regulating switch, so that the contacts are easy to ablate, adhere and generate high temperature under the condition of the same power, the working reliability is reduced, and the service life is shortened; when a large current is applied and the reversing assembly is used as a current switch, the reversing assembly cannot be effectively and quickly rotated and positioned, so that electric arcs are easily generated between a reversing contact piece and a motor terminal when the reversing assembly is used as a switch, and the reversing assembly is heated, melted, deformed and failed; in the reversing component of the existing electric tool switch, a motor terminal is easy to loosen under the influence of impact and vibration in use, and the reversing component can also generate electric arcs and be heated, melted, deformed and failed in use. Meanwhile, besides the four main use defects, the existing structural form also has the defects of complex assembly process, difficult realization of automatic production, relatively high cost and the like.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a high-current electric tool switch which can effectively reduce the local heating and the temperature rise of the contact area between a conductive connecting bridge and a bracket terminal, can realize the rapid on-off, anti-rebound and anti-arcing between a movable contact on the conductive connecting bridge and a static contact on a static contact terminal, and can prevent the arc ignition and the heating melting deformation failure when a reversing assembly is used as the switch, thereby better ensuring the use reliability and prolonging the service life.

The technical problem of the utility model is realized by the following technical scheme:

a high-current electric tool switch comprises a shell, a bracket terminal, a static contact piece terminal, a positive terminal and a reversing assembly which are arranged in the shell, and a trigger assembly and a reversing rod which are arranged outside the shell; the bracket terminal is provided with a conductive connecting bridge which is rotatably arranged in a see-saw manner and is provided with a rear end adjacent to the static contact terminal and a front end far away from the static contact terminal; the trigger assembly is provided with a bullet which elastically pushes the outer surface of the conductive connecting bridge, the bullet is driven by the trigger assembly to slide back and forth along the outer surface of the conductive connecting bridge and drives the front end and the rear end of the conductive connecting bridge to respectively form a seesaw type ascending or descending, and the top of the bracket terminal is provided with a conductive rod and an elastic seat; the inner surface of the middle part of the conductive connecting bridge is rotationally assembled on the conductive rod through arc contact, and the outer surface of the middle part of the conductive connecting bridge is provided with a rapid on-off bulge; the elastic seat is provided with elastic side walls which respectively extend to two sides of the conductive connecting bridge, and the opposite surfaces of the elastic side walls at the two sides are respectively provided with a limiting convex hull; the trigger assembly is pressed inwards to move, and drives the bullet to slide backwards to cross the quick on-off bulge, the bullet pushes the rear end of the conductive connecting bridge to quickly descend and contact the static contact terminal, so that quick connection conduction between the static contact terminal and the bracket terminal is formed, and the rear end of the conductive connecting bridge is also pressed down and limited by the limiting convex hulls on the elastic side walls at two sides when quickly descending; the trigger assembly moves outwards to reset, the bullet is driven to slide forwards to cross the rapid on-off protrusion, the bullet pushes the front end of the conductive connecting bridge to descend rapidly, the rear end of the conductive connecting bridge rises rapidly to separate from the static contact terminal, rapid disconnection conduction between the static contact terminal and the support terminal is formed, and the rear end of the conductive connecting bridge also is pushed upwards by the limiting convex bags on the elastic side walls on two sides to limit the position of the conductive connecting bridge when rising rapidly.

The reversing assembly comprises a reversing bottom shell, a motor terminal arranged outside the reversing bottom shell, a reversing rotary disc rotatably assembled in the reversing bottom shell and a reversing splicing piece arranged on the reversing rotary disc, wherein an eccentric shaft is arranged on the reversing rotary disc, the eccentric shaft penetrates through an arc-shaped hole in the reversing bottom shell and is assembled in a straight circular hole in the front of a reversing rod, and the middle part of the reversing rod is rotatably arranged in the shell; the reversing rod rotates around the middle part, the eccentric shaft is driven by the straight round hole to slide along the arc-shaped hole in a reciprocating mode, the eccentric shaft drives the reversing rotary disc to rotate in the reversing bottom shell in a reciprocating mode, and then the reversing splicing piece is driven to conduct electricity between the motor terminal and the positive terminal or disconnect the electricity between the motor terminal and the positive terminal.

The front end of the reversing rod is provided with an outer positioning bead which is pushed forwards elastically, the outer surface of the reversing bottom shell is correspondingly provided with a wave-shaped passing boss, and the reversing rod rotates around the middle part and drives the outer positioning bead to be positioned in the passing boss selectively; the reversing rotary table is rotatably assembled in a rotary groove of the reversing bottom shell, an inner positioning bead which is elastically pushed outwards is arranged on the outer circumferential surface of the reversing rotary table, a plurality of positioning grooves are correspondingly arranged on the inner groove wall of the rotary groove, the reversing rotary table rotates in the rotary groove in a reciprocating mode and drives the inner positioning bead to be selectively positioned in the plurality of positioning grooves.

The inner surface of the middle part of the conductive connecting bridge is provided with an arc-shaped groove extending along the width direction of the conductive connecting bridge, the conductive rod is cylindrical, and the inner surface of the middle part of the conductive connecting bridge is assembled on the cylindrical conductive rod through the arc-shaped groove to form arc-shaped contact rotation.

Two sides of the rear end of the conductive connecting bridge are respectively provided with a chamfer inclined plane, and two ends of the arc-shaped groove are respectively provided with a limiting groove; the rapid on-off protrusion is a slope arranged on the outer surface of the middle part of the conductive connecting bridge, the slope bottom of the slope is close to the front end of the conductive connecting bridge and serves as a first gear passing point, and the slope top of the slope is close to the rear end of the conductive connecting bridge and serves as a second gear passing point.

The support terminal top be equipped with the location tongue piece of buckling backward, the both sides of this location tongue piece are equipped with respectively and supply the conducting rod passes and forms electrically conductive connection of installing and lack and the connecting hole, be equipped with the electrically conductive connection pin of welding with conducting rod one end formation in connecting and lack one side.

The elastic seat is a U-shaped seat formed by a bottom plate and an elastic side wall formed by bending the two ends of the bottom plate in the same direction, a positioning hole and a positioning column which form positioning, assembling and fixing are respectively arranged between the bottom plate and the positioning tongue piece, and a positioning pin and a positioning notch which form positioning, assembling and fixing are respectively arranged between the rear side of the bottom plate and the rear end of the positioning tongue piece.

Each elastic side wall is provided with an arc-shaped buckle lug on one side.

The bracket terminal is provided with a mounting groove and a locking convex hull.

The top of the static contact terminal is provided with a static contact, the rear end of the conductive connecting bridge is correspondingly provided with a movable contact which is matched and contacted with the static contact, the bottom of the static contact terminal and the bottom of the bracket terminal extend out of the shell to be exposed, and a connector assembly in conductive connection is arranged between the bottom of the static contact terminal and the bottom of the bracket terminal.

Compared with the prior art, the utility model is mainly characterized in that a conductive rod and an elastic seat are additionally arranged on the top of a bracket terminal, the inner surface of the middle part of a conductive connecting bridge is rotationally assembled on the conductive rod through arc contact, a rapid on-off bulge is also arranged on the outer surface of the middle part of the conductive connecting bridge, the elastic seat is provided with elastic side walls which respectively extend to two sides of the conductive connecting bridge, and the opposite surfaces of the elastic side walls at the two sides are respectively provided with a limiting convex closure; therefore, when the trigger assembly is pressed inwards to move, the bullet can be driven to slide backwards to cross the quick on-off bulge, the bullet can push the rear end of the conductive connecting bridge to quickly descend to contact the static contact terminal, so that quick connection conduction between the static contact terminal and the bracket terminal is formed, and the rear end of the conductive connecting bridge is quickly descended and is pressed down to limit by the limiting convex hulls on the elastic side walls at two sides; when the trigger assembly moves outwards to reset, the bullet can be driven to slide forwards to cross the rapid on-off protrusion, the bullet can push the front end of the conductive connecting bridge to descend rapidly, and the rear end of the conductive connecting bridge rises rapidly to separate from the static contact terminal, so that the rapid off conduction between the static contact terminal and the support terminal is formed, and the rear end of the conductive connecting bridge also is pushed upwards by the limiting convex packet on the elastic side walls on the two sides to limit the position when rising rapidly. Obviously, the improvement of the structure can effectively reduce the local heating and the temperature rise of the contact area of the conductive connecting bridge and the bracket terminal, and can realize the quick on-off, rebound prevention and arc discharge prevention between the movable contact on the conductive connecting bridge and the static contact on the static contact terminal; meanwhile, the reversing rod drives the reversing turntable to rotate in a reciprocating manner in the reversing bottom shell for double positioning, so that looseness of a motor terminal caused by impact and vibration in actual use can be reduced, and the situation that electric arc ignition is easily generated between a reversing contact piece and the motor terminal when the reversing assembly is used as a switch, and then the reversing assembly is heated, melted, deformed and failed can be avoided; therefore, the structural improvements can better ensure the use reliability of the high-current electric tool switch and greatly prolong the service life.

Drawings

Fig. 1 is a schematic cross-sectional view of a power tool switch in an open state.

Fig. 2 is a diagram showing the positional relationship among the conductive bridge, the bracket terminal and the stationary contact terminal in fig. 1 in an open state.

Fig. 3 is a schematic cross-sectional view of the power tool switch in a closed state.

Fig. 4 is a diagram showing the positional relationship among the conductive bridge, the bracket terminal and the stationary contact terminal in fig. 3 in a closed state.

Fig. 5 is an exploded perspective view of the components constituting the present invention.

Fig. 6 is an exploded perspective view of the various components of fig. 5, fully exploded.

Fig. 7 is a schematic structural diagram of the conductive bridge installed on the bracket and located at the rear end and tilted up and the front end and lowered down.

Fig. 8 is a left side view of fig. 7.

Fig. 9 is a right side view of fig. 7.

Fig. 10 is an enlarged view of fig. 7 at a.

Fig. 11 is a perspective view of fig. 7.

Fig. 12 is an exploded perspective view of fig. 11.

Fig. 13 is a perspective view of one of the carrier terminals.

Fig. 14 is another perspective view of the bracket terminal.

Fig. 15 is a perspective view of the elastic seat.

Fig. 16 is a schematic structural diagram of a conductive bridge.

Fig. 17 is an enlarged view of fig. 16 at B.

Fig. 18 is a top view of fig. 16.

Fig. 19 is a perspective view of fig. 16.

FIG. 20 is a schematic view of the trigger assembly.

Fig. 21 is an exploded perspective view of fig. 20.

Figure 22 is a schematic view of the reversing lever in one of its positions in cooperation with the reversing assembly.

Fig. 23 is a rear view of fig. 22.

FIG. 24 is a schematic view of the reversing lever in another position with the reversing assembly engaged.

Fig. 25 is a rear view of fig. 24.

Fig. 26 is a perspective view of the reversing assembly.

Fig. 27 is a perspective view of the opposite side of fig. 26.

Fig. 28 is an exploded perspective view of fig. 27.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the above drawings.

As shown in fig. 1 to 28, 1 is a housing, 10 is a connector assembly, 11 is a bottom shell, 111 is a fastening groove, 12 is a housing cover, 13 is a spring, 14 is a conductive rod, 2 is a bracket terminal, 21 is a positioning tongue piece, 211 is a positioning column, 212 is a positioning notch, 22 is a connecting notch, 23 is a connecting hole, 24 is a connecting pin, 25 is a mounting groove, 26 is a locking convex bag, 3 is a static contact terminal, 30 is a static contact, 4 is a positive terminal, 5 is a trigger assembly, 51 is a spring head, 52 is a push rod, 521 is an end hole, 522 is a side hole, 53 is a dust ring, 54 is a trigger block, 55 is a positioning pin, 56 is a push rod spring, 57 is a spring head spring, 6 is a conductive connecting bridge, 60 is a movable contact, 61 is an arc-shaped groove, 62 is a quick on-off protrusion, 621 is a first over-stop point, 622 is a second over stop point, 63 is a limit groove, 64 is a chamfer inclined plane, 7 is an elastic seat, 71 is a bottom plate, 711, and 711 is a positioning hole, 712. The motor comprises a positioning pin 72, an elastic side wall 721, a limiting convex hull 722, an arc-shaped buckling lug 8, a reversing rod 81, a rotating shaft 82, a straight round hole 83, an outer positioning ball 83, a reversing assembly 9, a reversing bottom shell 91, a reversing bottom shell 911, a rotating groove 912, a gear passing protrusion 913, a positioning groove 914, an arc-shaped hole 92, a reversing rotary disc 921, an eccentric shaft 921, an inner positioning ball 93, a reversing connecting piece 94 and a motor terminal 95.

A large-current electric tool switch is mainly used as an electric tool switch with high current-carrying requirements as shown in figures 1-6, and in the embodiment, the left side of a view shown in figure 1 is used as the rear end of the electric tool switch, and the right side of the view is used as the front end of the electric tool switch, and the large-current electric tool switch structurally comprises a shell 1, a bracket terminal 2, a static contact terminal 3, a positive terminal 4 and a reversing assembly 9 which are arranged in the shell, and a trigger assembly 5, a reversing rod 8 and the like which are arranged outside the shell.

The housing 1 is formed by fastening a bottom case 11 and a housing cover 12, wherein the bottom case 11 and the housing cover 12 are made of non-conductive plastic material, and other components are enclosed by fastening the bottom case 11 and the housing cover 12.

The static contact terminal 3, the support terminal 2 and the positive terminal 4 are sequentially arranged side by side at intervals from left to right as shown in fig. 1 and fig. 3, the bottom of the static contact terminal 3, the bottom of the support terminal 2 and the bottom of the positive terminal 4 all extend out of the bottom of the shell 1 to be exposed, and a connector assembly 10 in conductive connection is arranged between the bottom of the static contact terminal 3 and the bottom of the support terminal 2.

The top of the static contact piece terminal 3 is vertically bent and then is provided with a fixed static contact 30; 2 tops of support terminal be equipped with conducting rod 14, elastic seat 7 and wane formula and rotate the electrically conductive bridge 6 of installing on conducting rod 14, the concrete structure is: as shown in fig. 13 and 14, the top of the bracket terminal 2 is provided with a positioning tongue piece 21 which is bent by punching and bending by 90 degrees and extends backwards, that is, is bent perpendicularly towards the static contact terminal 3, the positioning tongue piece is provided with a cylindrical positioning column 211 formed by punching, and the rear end of the positioning tongue piece is provided with a rectangular positioning notch 212; two sides of the positioning tongue piece 21 are respectively provided with a connecting notch 22 and a connecting hole 23, the connecting notch 22 is formed by bending one side of the positioning tongue piece 21 backward by 90 degrees, and the other side of the positioning tongue piece 21 is provided with a rectangular through hole formed by bending the other side of the positioning tongue piece 21 backward by 90 degrees.

The conductive rod 14 is cylindrical, two ends of the cylindrical conductive rod 14 respectively penetrate through the connecting notches 22 and the connecting holes 23 to form conductive installation, one side of each connecting notch 22 is provided with a connecting pin 24, and the conductive rod 14 at one end of each connecting notch is bent to form welding conduction with the connecting pin 24 through an electric welding process or a soldering process.

Connecting hole 23 one side be equipped with mounting groove 25, support terminal 2 middle part is equipped with locking convex closure 26, this support terminal 2 coincide through mounting groove 25 and locking convex closure 26 and inlay the dress in casing 1 to form comparatively stable mounting structure, its design objective is in order to in the use of electric tool switch, even receive influence such as impact, vibration can not lead to support terminal 2 not to appear the installation not hard up, guaranteed support terminal 2's use reliability.

The conductive bridge 6 is a long strip plate-shaped component, the inner surface of the middle part of the conductive bridge 6 is provided with an arc-shaped groove 61 extending along the width direction of the conductive bridge, and the conductive bridge 6 is assembled on the cylindrical conductive rod 14 through the arc-shaped groove 61 of the inner surface of the middle part to form smooth rotation of arc contact, namely, seesaw rotation, so that the conductive bridge 6 is provided with the rear end adjacent to the static contact terminal 3 and the front end far away from the static contact terminal 3, the rear end of the conductive bridge 6 is also provided with a movable contact 60 which can form matched contact conduction with the static contact 30 at the top of the static contact terminal 3; and two ends of the arc-shaped groove 61 are respectively provided with a limiting groove 63 which can be clamped at the top of the bracket terminal 2.

The outer surface of the middle part of the conductive bridge 6 is provided with a rapid on-off projection 62 formed by stamping, the rapid on-off projection is a slope arranged on the outer surface of the middle part of the conductive bridge 6, the slope bottom of the slope is close to the front end of the conductive bridge and serves as a first gear passing point 621, and the slope top of the slope is close to the rear end of the conductive bridge and serves as a second gear passing point 622.

As shown in fig. 15, the elastic seat 7 is a U-shaped seat formed by a bottom plate 71 and an elastic side wall 72 formed by bending two ends of the bottom plate in the same direction, the bottom plate 71 is provided with a circular positioning hole 711, and the rear side of the bottom plate 71 is provided with a positioning leg 712 bent upward; thus, the elastic seat 7 is fixed together by riveting process after being positioned and assembled with the positioning post 211 on the positioning tongue piece 21 through the positioning hole 711 on the bottom plate 71; the positioning leg 712 at the back of the bottom plate 71 is also clamped in the positioning notch 212 at the back end of the positioning tongue piece 21 to form a positioning and assembling fixation, so that the elastic seat 7 forms a mounting fixation on the top of the bracket terminal 2.

Meanwhile, two elastic side walls 72 of the elastic seat 7 respectively extend to two sides of the rear end of the conductive bridge 6, the two elastic side walls 72 form an arc shape which is relatively convex inwards, a limit convex hull 721 is respectively arranged on the opposite surfaces of the elastic side walls 72 on two sides of the rear end of the conductive bridge 6, and an arc-shaped fastening lug 722 is arranged on one side of each elastic side wall 72; when the rear end of the conductive bridge 6 descends rapidly, the rear end of the conductive bridge can be pressed downwards for limiting through the limiting convex hulls 721 on the elastic side walls 72 at two sides, namely, the electric tool switch is kept in a stable opening state; when the rear end of the conductive bridge 6 rises rapidly, the conductive bridge can be pushed upwards to limit the rear end of the conductive bridge through the limiting convex hulls 721 on the elastic side walls 72 at two sides, namely, the electric tool switch is ensured to be maintained in a stable closing state; the two sides of the rear end of the conductive bridge 6 are respectively provided with a chamfer inclined surface 64 so as to be matched with the downward pressing limit or the upward pushing limit of the limit convex hull 721, and the arc-shaped buckling lugs 722 on the two sides mainly provide elasticity to press the conductive bridge 6, so that the arc-shaped groove 61 on the inner surface of the middle part of the conductive bridge can form close and reliable contact with the outer surface of the conductive rod 14 without loosening.

As shown in fig. 20 and 21, the trigger assembly 5 includes a push rod 52, an inner end of the push rod, i.e., a rear end shown in fig. 1, extends into the housing 1 to form an end hole 521, an outer end of the push rod, i.e., a front end shown in fig. 1, extends out of the housing 1 to form a trigger block 54, and a dust ring 53 is further sleeved on the outer end of the push rod 52 and is spaced from the trigger block 54 to play a dust-proof role when the push rod 52 reciprocates; the end hole 521 is internally provided with a positioning pin 55 which is elastically pushed backwards by a push rod spring 56, and the positioning pin is positioned and fixed in the shell 1, so that the push rod 52 can be provided with a reset thrust which elastically moves outwards by the push rod spring 56, and correspondingly, when the trigger block 54 is pressed inwards, the push rod 52 can be driven to synchronously move inwards and compress the push rod spring 56; the bottom side of the front part of the push rod 52 is provided with a side hole 522 which is opened downwards, the inside of the side hole is provided with a bullet 51 which is elastically pushed downwards by a bullet spring 57, and the bullet is just elastically pushed on the outer surface of the conductive connecting bridge 6, so that the bullet 51 can be driven by the inner and outer driving of the trigger component 5 to slide back and forth along the outer surface of the conductive connecting bridge 6, and the front end and the rear end of the conductive connecting bridge can be driven to rotate around the conductive rod 14 respectively to form the rising or falling of a seesaw type.

Moreover, when the bullet 51 is driven by the trigger assembly 5 to slide back and forth along the outer surface of the conductive bridge 6, the bullet passes through the rapid on-off protrusion 62, specifically: when the trigger assembly 5 is pressed inward and drives the bullet 51 to slide backward through the first passing point 621 but not through the second passing point 622, the elastic force applied to the bullet 51 pushes directly on the conductive rod 14, and at this time, the rear end of the conductive bridge 6 is still pushed up by the limit protrusions 721 on the elastic side walls 72 on both sides to limit, that is, the electric tool switch is still in the off state in this structural state.

When the trigger assembly 5 continues to move by pressing inward and drives the bullet 51 to continuously slide backward through the second passing point 622, the elastic force on the bullet 51 pushes the rear end of the conductive bridge 6 directly, at this time, the elastic force on the rear end of the conductive bridge overcomes the upward pushing limit of the limiting convex hulls 721 on the elastic side walls 72 on both sides, so that the rear end of the conductive bridge 6 is pushed to rapidly descend and contact the static contact terminal 3, thereby forming rapid conduction between the static contact terminal 3 and the bracket terminal 2, namely, the electric tool switch is in an open state in the structural state, and the rear end of the conductive bridge 6 is rapidly descended and is pressed down and limited by the limiting convex hulls 721 on the elastic side walls 72 on both sides.

When the trigger assembly 5 is pressed inwards to move, the push rod spring 56 is always compressed, so when the inwards pressing force on the trigger assembly 5 is released, the trigger assembly is pushed by the elastic force of the push rod spring 56 to move outwards to reset, and the bullet 51 is driven to slide forwards through the second passing point 622, due to the special slope design of the quick on-off protrusion 62, the bullet 51 slides quickly through the first passing point 621 as well, and the elastic force on the bullet 51 pushes the bullet to directly act on the front end of the conductive bridge 6, at this time, the front end of the conductive bridge descends quickly and the rear end of the conductive bridge ascends quickly, the rear end of the conductive bridge ascends quickly overcomes the pressing limit of the limiting convex bag 721 on the elastic side walls 72 at two sides to quickly separate from the static contact terminal 3, so as to form quick off conduction between the static contact terminal and the bracket terminal 2, namely, the electric tool switch is in a closed state under the structural state, and the rear end of the conductive bridging 6 is pushed up by the limiting convex hulls 721 on the two side elastic side walls 72 for limiting while rapidly rising.

The reversing assembly 9 comprises a reversing bottom shell 91, a motor terminal 95 arranged outside the reversing bottom shell, a reversing rotary disk 92 rotatably assembled in the reversing bottom shell 91 and a reversing connecting piece 94 elastically installed on the reversing rotary disk 92 through a spring 13, wherein an eccentric shaft 921 is arranged on the reversing rotary disk 92, the eccentric shaft passes through an arc-shaped hole 914 on the reversing bottom shell 91 and is assembled in a straight round hole 82 at the front part of the reversing rod 8, the middle part of the reversing rod 8 is rotatably installed in the shell 1 through a rotating shaft 81, and particularly is installed in a round shaft hole formed by mutually buckling a semicircular buckling groove 111 of the bottom shell 11 and a semicircular buckling groove 111 of the shell cover 12; thus, the reversing lever 8 rotates around the middle rotating shaft 81, so that the eccentric shaft 921 is driven by the straight circular hole 82 to slide along the arc-shaped hole 914 in a reciprocating manner, and the eccentric shaft 921 drives the reversing rotary disc 92 to rotate in a reciprocating manner in the reversing bottom case 91, so as to drive the reversing tab 94 to switch on or switch off the conduction between the motor terminal 95 and the positive terminal 4.

In addition, the front end of the reversing lever 8 is provided with an outer positioning ball 83 which is elastically pushed forward by a spring 13, and correspondingly, the outer surface of the reversing bottom shell 91 is provided with a wave-shaped shift-passing protrusion 912, so that when the reversing lever 8 rotates around the rotating shaft 81, the outer positioning ball 83 can be driven to be selectively positioned in the shift-passing protrusion 812; meanwhile, the reversing rotary table 92 is rotatably mounted in the rotary groove 911 of the reversing bottom case 91, an inner positioning bead 93 elastically pushed outward by a spring 12 is also disposed on the outer circumferential surface of the reversing rotary table 92, a plurality of positioning grooves 913 are correspondingly disposed on the inner groove wall of the rotary groove 911, and the reversing rotary table 92 is reciprocally rotated in the rotary groove 911 to drive the inner positioning bead 93 to be selectively positioned in the plurality of positioning grooves 913. Therefore, the reversing rod 8 drives the reversing rotary disc 92 to rotate in the reversing groove 911 of the reversing bottom case 91 in a reciprocating manner to form double positioning, so that looseness caused by impact and vibration in actual use of the motor terminal 95 can be reduced, and the situation that arc ignition is easily generated due to the fact that the reversing component cannot rotate and position effectively and quickly between the reversing contact piece 94 and the motor terminal 95 when the reversing component 9 is used as a switch, and then the reversing component 9 is heated, melted, deformed and failed can be avoided.

In summary, the present invention has the following structural advantages:

firstly, the bracket terminal 2 is used as a current-carrying component, and the outer circle surface of the conductive rod 14 is in arc surface contact fit with the arc-shaped groove 61 of the conductive bridge 6, so that the generation of electric arc is effectively reduced in the switching-on or switching-off process, and the arc-extinguishing device has an obvious arc-extinguishing effect, thereby reducing the possibility of generating heat at the contact part of the two and also obtaining larger current-carrying capacity.

The support terminal 2 is structurally provided with the conductive rod 14 in the form of the connecting notches 22 and the connecting holes 23, one end of the conductive rod is welded on the connecting pins 24 of the support terminal 2, the mounting stability of the conductive rod 14 can be guaranteed, the contact current-carrying capacity can be effectively improved, the structure and the assembling process are simpler, and the production cost is greatly reduced.

Thirdly, the mounting groove 25 and the anti-loosening convex hull 26 designed on the bracket terminal 2 can enable the bracket terminal 2 to be positioned in the shell 1 without loosening, so that electric arcs between the conductive bridge 6 and the conductive rod 14 caused by vibration in the using process are avoided, and the service life of the electric tool switch is prolonged.

And fourthly, the elastic force generated by the arc-shaped buckling lug 722 on the elastic sheet seat 7 can ensure that the conductive bridge 6 can effectively keep good contact with the conductive rod 14 on the bracket terminal 2 even under the vibration condition, thereby preventing the generation of electric arcs and overheating phenomena.

Fifthly, the trigger component 5 drives the bullet 51 to slide backwards, namely when the electric tool switch is switched from a closed state to an open state, the elastic force generated by the two limiting convex hulls 721 on the elastic sheet seat 7 is matched with the quick on-off protrusion 62 on the conductive contact bridge 6 and the chamfer inclined planes 64 on the two sides of the rear end of the conductive contact bridge, so that quick connection between the conductive contact bridge 6 and the static contact sheet terminal 3 can be realized, rebound in the closing process is avoided, effective contact can still be kept under the vibration condition, ignition and ablation between contacts are avoided, and the electric service life of the electric tool switch is prolonged.

Sixthly, the trigger component 5 drives the bullet 51 to slide forward, namely when the electric tool switch is switched from an open state to a closed state, the elastic force generated by the two limit bulges 721 on the elastic sheet seat 7 is matched with the rapid on-off protrusion 62 on the conductive contact bridge 6, so that the conductive contact bridge 6 and the static contact piece terminal 3 can be quickly disconnected, the arc discharge and ablation between contacts are avoided, and the electric service life of the electric tool switch is prolonged.

Seventhly, the outer positioning ball 83 at the front end of the reversing rod 8, the over-stop protrusion 912 on the reversing bottom shell 91, the inner positioning ball 93 on the outer circumferential surface of the reversing rotary disc 92 and the plurality of positioning grooves 913 on the inner groove wall of the rotary groove 911 form double positioning matching for use, so that the quick reversing capability of the reversing assembly 9 is greatly enhanced, the generation of electric arcs between the reversing contact piece 91 and the motor terminal 95 is effectively prevented, and the electric service life of the electric tool switch is prolonged.

The above description is only an example of the present invention, and those skilled in the art will understand that any equivalent structure design of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A high-current electric tool switch comprises a shell (1), a bracket terminal (2), a static contact terminal (3), a positive terminal (4) and a reversing assembly (9) which are arranged in the shell, and a trigger assembly (5) and a reversing rod (8) which are arranged outside the shell (1); a conductive connecting bridge (6) which is arranged in a seesaw type rotating manner is arranged on the bracket terminal (2), and the conductive connecting bridge is provided with the rear end of the adjacent static contact piece terminal (3) and the front end far away from the static contact piece terminal (3); the trigger assembly (5) is provided with a bullet (51) elastically pushing the outer surface of the conductive connecting bridge (6), the bullet is driven by the trigger assembly (5) to slide back and forth along the outer surface of the conductive connecting bridge (6) and drives the front end and the rear end of the conductive connecting bridge (6) to respectively form a seesaw type ascending or descending, and the elastic switch is characterized in that the top of the bracket terminal (2) is provided with a conductive rod (14) and an elastic seat (7); the inner surface of the middle part of the conductive connecting bridge (6) is rotationally assembled on the conductive rod (14) through arc contact, and the outer surface of the middle part of the conductive connecting bridge (6) is provided with a rapid on-off bulge (62); the elastic seat (7) is provided with elastic side walls (72) which respectively extend to two sides of the conductive connecting bridge (6), and the opposite surfaces of the elastic side walls at the two sides are respectively provided with a limit convex hull (721); the trigger assembly (5) is pressed inwards to move, the bullet (51) is driven to slide backwards to cross the quick on-off protrusion (62), the bullet (51) pushes the rear end of the conductive connecting bridge (6) to quickly descend and contact the static contact terminal (3), so that quick connection conduction between the static contact terminal and the support terminal (2) is formed, and the rear end of the conductive connecting bridge (6) is quickly descended and is pressed downwards to be limited by the limiting convex hulls (721) on the elastic side walls (72) at two sides; trigger subassembly (5) outwards remove and reset to drive warhead (51) and slide forward and cross quick break-make arch (62), this warhead (51) pushes up conductive bridge (6) front end and descends fast and the rear end rises fast and breaks away from static contact terminal (3), and then constitutes the quick disconnection between static contact terminal and support terminal (2) electrically conductive, and also is pushed up spacing by spacing convex closure (721) on both sides elasticity lateral wall (72) when conductive bridge (6) rear end rises fast.

2. A high current electric tool switch according to claim 1, wherein said commutation assembly (9) comprises a commutation base case (91), a motor terminal (95) mounted outside the commutation base case, a commutation turntable (92) rotatably fitted in the commutation base case (91), and a commutation tab (94) mounted on the commutation turntable, the commutation turntable (92) is provided with an eccentric shaft (921) thereon, the eccentric shaft passes through an arc-shaped hole (914) in the commutation base case (91) and is fitted in a straight circular hole (82) in front of the commutation rod (8), and the middle of the commutation rod (8) is rotatably mounted in the housing (1); the reversing rod (8) rotates around the middle part, the eccentric shaft (921) is driven by the straight round hole (82) to slide along the arc-shaped hole (914) in a reciprocating mode, the eccentric shaft (921) drives the reversing rotary disc (92) to rotate in the reversing bottom case (91) in a reciprocating mode, and then the reversing connection piece (94) is driven to be connected with the conduction between the motor terminal (95) and the positive terminal (4) or the conduction between the motor terminal (95) and the positive terminal (4) is disconnected.

3. A high current electric tool switch according to claim 2, wherein the front end of the reversing lever (8) is provided with an outer positioning bead (83) which is pushed forward elastically, correspondingly, the outer surface of the reversing bottom shell (91) is provided with a wave-shaped shift-passing protrusion (912), and the reversing lever (8) rotates around the middle part and drives the outer positioning bead (83) to be positioned in the shift-passing protrusion (912); the reversing rotary table (92) is rotatably assembled in a rotary groove (911) of the reversing bottom case (91), an inner positioning bead (93) which is elastically pushed outwards is arranged on the outer circumferential surface of the reversing rotary table (92), a plurality of positioning grooves (913) are correspondingly arranged on the inner groove wall of the rotary groove (911), and the reversing rotary table (92) rotates in the rotary groove (911) in a reciprocating manner and drives the inner positioning bead (93) to be selectively positioned in the plurality of positioning grooves (913).

4. A high current electric tool switch according to claim 1, wherein said conducting bridge (6) has an arc-shaped groove (61) extending along the width direction of the conducting bridge on the inner surface of the middle portion thereof, said conducting rod (14) is cylindrical, and said conducting bridge (6) has an arc-shaped contact rotation by fitting the inner surface of the middle portion thereof on the cylindrical conducting rod (14) through said arc-shaped groove (61).

5. A high current electric tool switch according to claim 1, wherein both sides of the rear end of the conductive bridge (6) are respectively provided with a chamfer inclined plane (64), and both ends of the arc-shaped groove (61) are respectively provided with a limit groove (63); the rapid on-off protrusion (62) is a slope arranged on the outer surface of the middle part of the conductive bridge (6), the slope bottom of the slope is close to the front end of the conductive bridge and serves as a first gear passing point (621), and the slope top of the slope is close to the rear end of the conductive bridge and serves as a second gear passing point (622).

6. A high current electric tool switch according to claim 1, characterized in that the top of the bracket terminal (2) is provided with a positioning tongue piece (21) bent backwards, the two sides of the positioning tongue piece are respectively provided with a connecting notch (22) and a connecting hole (23) for the conductive rod (14) to pass through and form conductive installation, and one side of the connecting notch is provided with a connecting pin (24) which forms conductive welding with one end of the conductive rod (14).

7. A high current electric tool switch according to claim 6, wherein said elastic seat (7) is a U-shaped seat formed by a bottom plate (71) and an elastic side wall (72) formed by bending the two ends of the bottom plate in the same direction, a positioning hole (711) and a positioning post (211) for positioning, assembling and fixing are respectively arranged between the bottom plate (71) and the positioning tongue piece (21), and a positioning pin (712) and a positioning notch (212) for positioning, assembling and fixing are respectively arranged between the rear side of the bottom plate (71) and the rear end of the positioning tongue piece (21).

8. A high current power tool switch according to claim 7, wherein each of said resilient side walls (72) is provided with an arcuate shaped tab (722) on one side.

9. A high current electric tool switch according to claim 1, wherein said carrier terminal (2) is provided with mounting grooves (25) and locking protrusions (26).

10. A high current electric tool switch according to claim 1, wherein said static contact terminal (3) is provided with a static contact (30) at the top and a movable contact (60) adapted to contact said static contact at the rear end of the conductive bridge (6), and wherein said static contact terminal (3) and said support terminal (2) are exposed at the bottom extending out of the housing (1) and wherein a conductive connector assembly (10) is provided between the bottom of the static contact terminal (3) and the bottom of the support terminal (2).

Images