CN212761486U - Safety interlocking device of electric saw - Google Patents

Abstract

The utility model discloses a safety interlock of electric saw, include: a press locking mechanism, a motor start button and a machine head locking mechanism; the push-down locking mechanism is: the middle parts of the swing rod and the downward pressing catch are respectively hinged with the handpiece shell, the inner end of the downward pressing catch is lifted upwards under the action of a torsion spring, the front end of the swing rod is positioned above the inner end of the downward pressing catch, the rear end of the swing rod is fixed with the unlocking block, and a reset spring is arranged above the rear end of the swing rod; the machine head locking mechanism is as follows: the mounting rack is provided with a hinged locking plate, the front end of the locking plate is provided with a locking groove, the machine head shell is provided with a rotating shaft, a locking pin and a driving piece, the inner end of the rotating shaft is provided with a slope-shaped boss, and the outer end of the rotating shaft is fixed with the driving piece; the machine head shell is provided with a connecting rod fixed with a motor starting button, the rear part of the swing rod is provided with a blocking boss, the connecting rod is provided with a hook groove, and the rotating shaft is provided with a hook platform. The device can improve the safety of the electric saw and is convenient for replacing the saw blade.

Description

Safety interlocking device of electric saw

Technical Field

The utility model relates to an electric tool field, concretely relates to safety interlock of electric saw.

Background

The structure of the existing electric saw includes: the bottom plate is used for pressing the sawn object during cutting, the mounting frame and the machine head are provided with the saw blade, the saw blade is driven by a motor in the machine head to rotate, the mounting frame is arranged on the bottom plate, the rear end of the machine head is hinged with the mounting frame, so that the machine head can swing up and down on the mounting frame, a compression spring which can upwards push the machine head and upwards reset the machine head is arranged between the machine head and the mounting frame, the machine head upwards resets to abut against a limiting backer on the mounting frame and then enables the saw blade to be positioned above the bottom plate, the machine head is downwards pressed to overcome the elasticity of the compression spring and drive the saw blade to downwards swing and then enable the saw blade to downwards extend out of the bottom plate, the saw blade downwards extends out of the bottom plate and can be driven by the motor to rotate to cut the sawn object, in addition, when the saw blade needs to be changed, the machine head also needs to be downwards pressed, the machine head is also provided with a press locking mechanism which can be pressed to swing downwards after being unlocked, and a motor starting button which is reset by a spring and can start the motor after being pressed, the power supply is arranged in the machine head and supplies power to the motor through a power supply circuit, and after the motor starting button is pressed, the motor is electrified to start to drive the saw blade to rotate. However, the push-down locking mechanism and the motor start button on the existing electric saw are independent from each other and are not interlocked with each other, so that the push-down locking mechanism can be pushed down to drive the saw blade to rotate without being unlocked, and thus, great potential safety hazards exist. In addition, in the whole saw blade changing process, a worker is required to always press the machine head to keep the machine head at the position for changing the saw blade, and one hand of the worker is required to press the machine head, so that the worker can only change the saw blade by the other hand, the saw blade can be changed conveniently, and the labor intensity of the worker can be increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: a safety interlock device for a power saw capable of improving safety of the power saw is provided.

In order to solve the above problem, the utility model discloses the technical scheme who adopts does: a safety interlock for a power saw comprising: install mounting bracket on the bottom plate, with mounting bracket articulated aircraft nose, set up the motor start button who pushes down locking mechanical system and one by button spring reset on the aircraft nose, its characterized in that: further comprising: a head locking mechanism capable of locking the head for replacing the saw blade when the head is pressed down to swing down to a saw blade replacement position; the structure of the pressing locking mechanism is as follows: a swing rod moving forwards and backwards, a downward pressing catch moving leftwards and rightwards, and an unlocking block, wherein the middle parts of the swing rod and the downward pressing catch are respectively hinged with the handpiece shell, the inner end of the downward pressing catch is upwards lifted under the action of a catch torsion spring arranged in the handpiece, so that the outer end of the downward pressing catch is pressed to a position where the outward end of the downward pressing catch can abut against a blocking block on the mounting frame to prevent the handpiece from swinging downwards, the downward pressing locking mechanism is in a locking state at the moment, the front end of the swing rod is positioned above the inner end of the downward pressing catch, the rear end of the swing rod is fixed with the unlocking block, the front end of the swing rod can swing downwards by driving the upward moving energy of the unlocking block to press the inner end of the downward pressing catch, the outer end of the downward pressing catch can tilt upwards to a position where the handpiece is not prevented from swinging downwards, the downward pressing locking mechanism is in an unlocking state at the moment, and the rear end of the swing rod, which is positioned between the swing rod and a return spring for returning; the structure of the handpiece locking mechanism is as follows: a locking plate is arranged on the mounting frame and is positioned on the side surface of the machine head, the rear end of the locking plate is hinged with the mounting frame, so that the locking plate can swing up and down, a locking groove with an upward opening is arranged at the front end of the locking plate, the locking plate swings upwards under the action of a locking plate torsion spring arranged on the mounting frame until the front end of the locking plate abuts against a limit stop strip on the mounting frame, a rotatable rotating shaft with left and right directions is arranged on the machine head shell, a locking pin which is reset by the locking pin spring and has left and right directions, a driving piece, the inner end of the locking pin is arranged opposite to the inner end of the rotating shaft, the outer end of the locking pin faces to the side of the locking plate, a slope-shaped boss which can press the locking pin is arranged at the inner end of the rotating shaft, the outer end of the rotating shaft is fixed with the driving piece, so that, the outer end of the lock pin can extend out to a working position, the outer end of the lock pin at the working position can press the lock piece when the machine head swings downwards, so that the lock piece can swing downwards, the outer end of the lock pin can swing downwards by being attached to the upper side surface of the lock piece, when the machine head swings downwards to a position for replacing a saw blade, the outer end of the lock pin just moves to the upper side of the lock groove, the lock piece can rotate upwards and reset under the action of a lock piece torsion spring, the outer end of the lock pin is clamped into the lock groove, so that the machine head can be locked by the lock piece, the machine head locking mechanism is in a locking state, when unlocking is needed, the slope-shaped boss can gradually loosen the press of the lock pin after the rotating shaft is driven to rotate reversely by the driving piece, so that the lock pin can retract under the action of the lock pin spring and is; the head shell is also provided with a connecting rod which moves forwards and backwards and can slide forwards and backwards, the connecting rod and a rotating shaft are both positioned below the swing rod, the rotating shaft is positioned in front of the connecting rod, the connecting rod and the motor starting button are fixed, so that the connecting rod can move backwards along with the pressing of the motor starting button, the side wall at the rear part of the swing rod is provided with a blocking boss, when the pressing locking mechanism is in a locking state, the blocking boss is positioned behind the connecting rod and can block the backward movement of the connecting rod, so that the connecting rod can not move backwards and the pressing of the motor starting button can be prevented, when the pressing locking mechanism is in an unlocking state, the blocking boss can swing upwards along with the rear end of the swing rod and can not be blocked behind the connecting rod, so that the motor starting button can be pressed to start the motor, the front end part of the connecting rod is provided with a hook groove with an opening at the bottom, the, the hook platform can be hooked upwards into the hook groove along with the forward rotation of the rotating shaft, so that the hook platform can be abutted against the front side wall of the hook groove, the connecting rod cannot move backwards, and the motor starting button can be prevented from being pressed down; when the motor start button is pressed down, the bottom wall of the front end of the connecting rod can move backwards to a position where the hook table is blocked from rotating forwards, so that the hook table cannot rotate forwards and the rotating shaft can be prevented from rotating forwards, and the lock pin cannot extend out of the working position.

Further, the safety interlock of the electric saw as described above, wherein: the driving piece is a handle, and the lower extreme and the pivot outer end of handle are fixed mutually, and the drive handle enables pivot forward rotation after swinging forward, and the drive handle enables pivot antiport after swinging backward, still is provided with on the aircraft nose casing and supplies forward wobbling handle to support and lean on and carry out preceding spacing chimb and can supply backward wobbling handle to support and carry out spacing back spacing chimb after to the handle.

Further, the safety interlock of the electric saw as described above, wherein: be provided with the card platform in the pivot outer end, be provided with the draw-in groove on handle lower extreme inboard, the handle lower extreme passes through the screw looks locking with the pivot and fixes to card platform card is gone into to the draw-in groove during fixed, makes the handle can be rotatory through matched with card platform and draw-in groove drive pivot.

Further, the safety interlock of the electric saw as described above, wherein: the inner side wall of the handle can respectively extrude the two positioning bosses when swinging back and forth, the elastic sheet where the positioning bosses are located can elastically deform inwards when the positioning bosses are extruded, so that the two positioning bosses can move inwards to abut against the inner side wall of the handle; when the handle swings forwards to abut against the front limiting convex edge, the front positioning boss can be just inserted into the front positioning hole to perform front positioning on the handle; when the handle swings backwards to abut against the rear limiting convex edge, the rear positioning boss can be just inserted into the rear positioning hole to perform rear positioning on the handle.

Further, the safety interlock of the electric saw as described above, wherein: a U-shaped frame straddling the shell of the handpiece is arranged above the handle, and one side of the U-shaped frame is fixed with the upper end of the handle.

Further, the safety interlock of the electric saw as described above, wherein: the hook groove is an arc hook groove, and the hook platform is an arc hook platform.

The utility model has the advantages that: the safety interlocking device of the electric saw is additionally provided with the machine head locking mechanism, so that the machine head can be locked by the machine head locking mechanism when swinging downwards to the position of replacing the saw blade, the machine head can be kept at the position of replacing the saw blade without manually pressing the machine head when the saw blade is replaced, and the saw blade can be conveniently replaced; in addition, the press locking mechanism, the motor starting button and the machine head locking mechanism in the safety interlocking device have the following interlocking relationship: (1) the motor starting button can be pressed only when the pressing locking mechanism is in an unlocking state and a hook platform on a rotating shaft in the machine head locking mechanism is not hooked into the hook groove; (2) when the motor starting button is pressed down, the rotating shaft cannot rotate in the positive direction, so that the lock pin in the machine head locking mechanism cannot extend out to a working position, the machine head locking mechanism cannot lock the machine head at the position of replacing the saw blade, and the safety performance of the electric saw can be greatly improved due to the interlocking relation.

Drawings

Fig. 1 is a schematic perspective view of a viewing angle of the electric saw according to the present invention.

Fig. 2 is a schematic perspective view of another viewing angle of the electric saw according to the present invention.

Fig. 3 is a schematic view of the three-dimensional structure of the electric saw of the present invention in the state of replacing the saw blade.

Fig. 4 is a schematic view of the three-dimensional structure of the handpiece after the housing and the handle are removed from one side.

Fig. 5 is a schematic view of the three-dimensional structure of the electric saw after the machine head is removed.

Fig. 6 is a schematic structural diagram of the positions of the relevant parts when the handle is not swung forward and the motor start button is not pressed.

Fig. 7 is a schematic structural diagram of positions of relevant parts when the handle swings forward and the motor start button is not pressed.

Fig. 8 is a schematic view of the structure of the handle shown in fig. 1.

Fig. 9 is a schematic view of a portion of the housing of the handpiece shown in fig. 1 that mates with the handle.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

As shown in fig. 1, 2, 3, 4, 5, 6, and 7, the safety interlock device of the electric saw includes: the motor starting device comprises a mounting frame 9 mounted on a bottom plate, a machine head 1 hinged with the mounting frame 9, a pressing locking mechanism arranged on the machine head 1 and a motor starting button 3 reset by a button spring, wherein the button spring for resetting the motor starting button 3 is arranged between the motor starting button 3 and a machine head shell, and the button spring is compressed when the motor starting button 3 is pressed; further comprising: a head locking mechanism capable of locking the head 1 to replace the saw blade when the head 1 is pressed down and swung down to a saw blade replacement position; the structure of the pressing locking mechanism is as follows: a swing rod 21 moving forwards and backwards, a downward pressing baffle 22 moving leftwards and rightwards and an unlocking block 2 are arranged on a casing of the machine head 1, the middle parts of the swing rod 21 and the downward pressing baffle 22 are respectively hinged with the casing of the machine head 1, the inner end of the downward pressing baffle 22 is lifted upwards under the action of a baffle torsion spring arranged in the machine head 1, so that the outer end of the downward pressing baffle 22 is pressed to a position which can be abutted against a baffle block on an installation frame 9 to prevent the machine head 1 from swinging downwards, at the moment, a downward pressing locking mechanism is in a locking state, the front end of the swing rod 21 is positioned above the inner end of the downward pressing baffle 22, the rear end of the swing rod 21 is fixed with the unlocking block 2, the front end of the swing rod 21 can swing downwards to press the inner end of the downward pressing baffle 22 by driving the upward movement of the unlocking block 2, so that the outer end of the downward pressing baffle 22 can tilt upwards to a position which does not prevent the machine head 1 from swinging downwards, a return spring 23 which is positioned between the swing rod 21 and the shell of the machine head 1 and can press the rear end of the swing rod 21 downwards to enable the unlocking block 2 to reset downwards is arranged above the rear end of the swing rod 21; the structure of the handpiece locking mechanism is as follows: a locking plate 43 positioned on the side surface of the machine head 1 is arranged on the mounting frame 9, the rear end of the locking plate 43 is hinged with the mounting frame 9, so that the locking plate 43 can swing up and down, a locking groove 431 with an upward opening is arranged at the front end of the locking plate 43, the locking plate 43 swings up under the action of a locking plate torsion spring arranged on the mounting frame 9 until the front end of the locking plate 43 abuts against a limiting barrier on the mounting frame 9, a rotatable rotating shaft 41 in the left-right direction, a locking pin 42 reset by the locking pin spring in the left-right direction and a driving piece 4 are arranged on the shell of the machine head 1, the locking pin spring resetting the locking pin 42 is positioned between the locking pin 42 and the shell of the machine head 1, and the locking pin spring is; the inner end of the lock pin 42 is opposite to the inner end of the rotating shaft 41, the outer end of the lock pin 42 faces the side of the lock sheet 43, a slope-shaped boss 411 capable of pressing the lock pin 42 is arranged at the inner end of the rotating shaft 41, and the outer end of the rotating shaft 41 is fixed with the driving part 4, so that the rotating shaft 41 can be driven to rotate through the driving part 4; moreover, after the driving part 4 drives the rotating shaft 41 to rotate forward, the slope-shaped boss 411 can gradually press the lock pin 42 outwards through the slope, so that the outer end of the lock pin 42 can extend outwards to a working position, the outer end of the lock pin 42 at the working position can press the lock plate 43 when the machine head 1 swings downwards, so that the lock plate 43 can swing downwards, so that the outer end of the lock pin 42 can swing downwards by being attached to the upper side surface of the lock plate 43, when the machine head 1 swings downwards to a position for replacing the saw blade, the outer end of the lock pin 42 just moves to the upper side of the lock groove 431, at the moment, the lock plate 43 can rotate upwards and reset under the action of the lock plate torsion spring, so that the outer end of the lock pin 42 is clamped into the lock groove 431, so that the lock plate 43 can lock the machine head 1, at the time, when the machine head locking mechanism is in a locking state, after the rotating shaft 41 is driven, so that the lock pin 42 can be retracted to be disengaged from the lock piece 43 by the lock pin spring, thereby enabling the handpiece lock mechanism to be in the unlocked state.

The reason why the locking piece 43 can be pressed when the outer end of the locking pin 42 in the working position swings downwards is that: the motion track of the locking groove 431 is on a small circle with the hinge point of the locking plate 43 as the center of a circle, the motion track of the locking pin 42 is on a large circle with the hinge point of the handpiece 1 as the center of a circle, the small circle corresponding to the locking groove 431 and the large circle corresponding to the locking pin 42 intersect at two points, and the center of the small circle is positioned in the large circle; the outer end of the detent 42 can snap into the detent 431 because: the two circles have an intersection, so that the outer end of the lock pin 42 and the lock groove 431 can be clamped at the intersection of the two circles; the locking plate 43 can lock the handpiece 1 after the outer end of the lock pin 42 is clamped in the locking groove 431 because: the centers of the movement tracks of the lock pin 42 and the lock groove 431 are not the same, and after the lock groove 431 and the lock pin 42 are clamped, the lock groove 431 and the lock pin 42 can be limited to swing up or down, so that the lock pin 42 and the lock groove 431 can be limited to be clamped and cannot swing, and the lock plate 43 can lock the handpiece 1.

A connecting rod 31 which can slide back and forth is arranged on the shell of the machine head 1, the connecting rod 31 and a rotating shaft 41 are both arranged below the swing rod 21, the rotating shaft 41 is arranged in front of the connecting rod 31, the connecting rod 31 and the motor starting button 3 are fixed, so that the connecting rod 31 can move back along with the pressing of the motor starting button 3, a blocking boss 24 is arranged on the side wall of the rear part of the swing rod 21, when the press locking mechanism is in a locking state, the blocking boss 24 is arranged behind the connecting rod 31 and can block the backward movement of the connecting rod 31, so that the connecting rod 31 can not move back and the pressing of the motor starting button 3 can be prevented, when the press locking mechanism is in an unlocking state, the blocking boss 24 can swing up along with the rear end of the swing rod 21 and can not block behind the connecting rod 31, so that the motor starting button 3 can be pressed to start the motor, a hook groove 32 with an opening at the bottom is arranged, a hook platform 44 is arranged on the rotating shaft, in the embodiment, the hook groove 32 is an arc hook groove, and the hook platform 44 is an arc hook platform; when the motor start button 3 is not pressed, the hook platform 44 can hook upwards into the hook groove 32 along with the forward rotation of the rotating shaft 41, so that the hook platform can abut against the front side wall of the hook groove 32, the connecting rod 31 cannot move backwards, and the motor start button 3 can be prevented from being pressed; when the motor start button 3 is pressed, the bottom wall of the front end of the connecting rod 31 moves backward to a position for blocking the forward rotation of the hook platform 44, so that the hook platform 44 cannot rotate forward and the rotating shaft 41 can be prevented from rotating forward, and the lock pin 42 cannot extend to the working position.

From the above, after the downward-pressing locking mechanism is in the unlocking state, the machine head can be pressed downward and swung downward; after the motor starting button is pressed down, the saw blade on the machine head can rotate; after a lock pin in the machine head locking mechanism extends to a working position, the machine head can be locked at the position of replacing the saw blade.

The following interlocking relationship exists among the press locking mechanism, the motor start button and the machine head locking mechanism: (1) the motor start button 3 can be pressed only when the push-down locking mechanism is in the unlocked state and the hook platform 44 on the rotating shaft 41 in the head locking mechanism is not hooked into the hook groove 32; (2) when the motor start button 3 is pressed, the rotating shaft 41 cannot rotate in the forward direction, so that the lock pin 42 in the handpiece locking mechanism cannot extend to the working position, and the handpiece locking mechanism cannot lock the handpiece at the position of replacing the saw blade.

In this embodiment, driving piece 4 is a handle, the lower extreme of handle 4 is fixed mutually with 41 outer ends of pivot, drive handle 4 can make 41 forward rotations of pivot after the forward swing, drive handle 4 can make 41 counter-rotation of pivot after the backward swing, still be provided with on the casing of locomotive 1 and supply forward wobbling handle 4 to support and support forward wobbling handle 4 and support and carry out spacing rear limit chimb 12 behind handle 4.

The outer end of the rotating shaft 41 is provided with a clamping table 45, the inner side of the lower end of the handle 4 is provided with a clamping groove 46, the lower end of the handle 4 is locked and fixed with the rotating shaft 41 through screws, and the clamping table 45 is clamped into the clamping groove 46 during fixing, so that the handle 4 can drive the rotating shaft 41 to rotate through the clamping table 45 and the clamping groove 46 which are matched with each other.

As shown in fig. 8 and 9, two elastic sheet holes 7 arranged in front and back are formed in the surface of the casing of the handpiece 1 opposite to the inner side wall of the handle 4, an elastic sheet 71 with one end fixed to the casing of the handpiece 1 and the other end not fixed is arranged in each of the two elastic sheet holes 7, a positioning boss protruding outwards from the surface of the casing of the handpiece 1 is arranged on the outer surface of the unfixed end of each of the two elastic sheets 71, the two positioning bosses are respectively a front positioning boss 61 and a rear positioning boss 62, a front positioning hole 51 and a rear positioning hole 52 are formed in the inner side wall of the handle 4, the inner side wall of the handle 4 can respectively extrude the two positioning bosses when swinging back and forth, and the elastic sheet 71 where the positioning bosses are located can elastically deform inwards when the positioning bosses are extruded, so that the two positioning bosses can move inwards and abut against the inner side wall of; when the handle 4 swings forwards to abut against the front limiting convex edge 11, the front positioning boss 61 can be just inserted into the front positioning hole 51 to position the handle 4 forwards; when the handle 4 swings backwards to abut against the rear limiting convex edge 12, the rear positioning boss 62 can be just inserted into the rear positioning hole 52 to perform rear positioning on the handle 4. The handle 4 is positioned to prevent the handle 4 from swinging when not being driven.

A U-shaped frame 47 straddling the shell of the handpiece 1 is arranged above the handle 4, and one side of the U-shaped frame 47 is fixed with the upper end of the handle 4. The U-shaped bracket 47 is provided, on the one hand, to facilitate the swinging of the driving handle 4 and, on the other hand, to guide the forward and backward swinging of the handle 4.

Claims (6)

1. A safety interlock for a power saw comprising: install mounting bracket on the bottom plate, with mounting bracket articulated aircraft nose, set up the motor start button who pushes down locking mechanical system and one by button spring reset on the aircraft nose, its characterized in that: further comprising: a head locking mechanism capable of locking the head for replacing the saw blade when the head is pressed down to swing down to a saw blade replacement position; the structure of the pressing locking mechanism is as follows: a swing rod moving forwards and backwards, a downward pressing catch moving leftwards and rightwards, and an unlocking block, wherein the middle parts of the swing rod and the downward pressing catch are respectively hinged with the handpiece shell, the inner end of the downward pressing catch is upwards lifted under the action of a catch torsion spring arranged in the handpiece, so that the outer end of the downward pressing catch is pressed to a position where the outward end of the downward pressing catch can abut against a blocking block on the mounting frame to prevent the handpiece from swinging downwards, the downward pressing locking mechanism is in a locking state at the moment, the front end of the swing rod is positioned above the inner end of the downward pressing catch, the rear end of the swing rod is fixed with the unlocking block, the front end of the swing rod can swing downwards by driving the upward moving energy of the unlocking block to press the inner end of the downward pressing catch, the outer end of the downward pressing catch can tilt upwards to a position where the handpiece is not prevented from swinging downwards, the downward pressing locking mechanism is in an unlocking state at the moment, and the rear end of the swing rod, which is positioned between the swing rod and a return spring for returning; the structure of the handpiece locking mechanism is as follows: a locking plate is arranged on the mounting frame and is positioned on the side surface of the machine head, the rear end of the locking plate is hinged with the mounting frame, so that the locking plate can swing up and down, a locking groove with an upward opening is arranged at the front end of the locking plate, the locking plate swings upwards under the action of a locking plate torsion spring arranged on the mounting frame until the front end of the locking plate abuts against a limit stop strip on the mounting frame, a rotatable rotating shaft with left and right directions is arranged on the machine head shell, a locking pin which is reset by the locking pin spring and has left and right directions, a driving piece, the inner end of the locking pin is arranged opposite to the inner end of the rotating shaft, the outer end of the locking pin faces to the side of the locking plate, a slope-shaped boss which can press the locking pin is arranged at the inner end of the rotating shaft, the outer end of the rotating shaft is fixed with the driving piece, so that, the outer end of the lock pin can extend out to a working position, the outer end of the lock pin at the working position can press the lock piece when the machine head swings downwards, so that the lock piece can swing downwards, the outer end of the lock pin can swing downwards by being attached to the upper side surface of the lock piece, when the machine head swings downwards to a position for replacing a saw blade, the outer end of the lock pin just moves to the upper side of the lock groove, the lock piece can rotate upwards and reset under the action of a lock piece torsion spring, the outer end of the lock pin is clamped into the lock groove, so that the machine head can be locked by the lock piece, the machine head locking mechanism is in a locking state, when unlocking is needed, the slope-shaped boss can gradually loosen the press of the lock pin after the rotating shaft is driven to rotate reversely by the driving piece, so that the lock pin can retract under the action of the lock pin spring and is; the head shell is also provided with a connecting rod which moves forwards and backwards and can slide forwards and backwards, the connecting rod and a rotating shaft are both positioned below the swing rod, the rotating shaft is positioned in front of the connecting rod, the connecting rod and the motor starting button are fixed, so that the connecting rod can move backwards along with the pressing of the motor starting button, the side wall at the rear part of the swing rod is provided with a blocking boss, when the pressing locking mechanism is in a locking state, the blocking boss is positioned behind the connecting rod and can block the backward movement of the connecting rod, so that the connecting rod can not move backwards and the pressing of the motor starting button can be prevented, when the pressing locking mechanism is in an unlocking state, the blocking boss can swing upwards along with the rear end of the swing rod and can not be blocked behind the connecting rod, so that the motor starting button can be pressed to start the motor, the front end part of the connecting rod is provided with a hook groove with an opening at the bottom, the, the hook platform can be hooked upwards into the hook groove along with the forward rotation of the rotating shaft, so that the hook platform can be abutted against the front side wall of the hook groove, the connecting rod cannot move backwards, and the motor starting button can be prevented from being pressed down; when the motor start button is pressed down, the bottom wall of the front end of the connecting rod can move backwards to a position where the hook table is blocked from rotating forwards, so that the hook table cannot rotate forwards and the rotating shaft can be prevented from rotating forwards, and the lock pin cannot extend out of the working position.

2. The safety interlock device for a power saw of claim 1, wherein: the driving piece is a handle, and the lower extreme and the pivot outer end of handle are fixed mutually, and the drive handle enables pivot forward rotation after swinging forward, and the drive handle enables pivot antiport after swinging backward, still is provided with on the aircraft nose casing and supplies forward wobbling handle to support and lean on and carry out preceding spacing chimb and can supply backward wobbling handle to support and carry out spacing back spacing chimb after to the handle.

3. The safety interlock device for a power saw of claim 2, wherein: be provided with the card platform in the pivot outer end, be provided with the draw-in groove on handle lower extreme inboard, the handle lower extreme passes through the screw looks locking with the pivot and fixes to card platform card is gone into to the draw-in groove during fixed, makes the handle can be rotatory through matched with card platform and draw-in groove drive pivot.

4. A safety interlock device for a power saw according to claim 2 or 3, wherein: the inner side wall of the handle can respectively extrude the two positioning bosses when swinging back and forth, the elastic sheet where the positioning bosses are located can elastically deform inwards when the positioning bosses are extruded, so that the two positioning bosses can move inwards to abut against the inner side wall of the handle; when the handle swings forwards to abut against the front limiting convex edge, the front positioning boss can be just inserted into the front positioning hole to perform front positioning on the handle; when the handle swings backwards to abut against the rear limiting convex edge, the rear positioning boss can be just inserted into the rear positioning hole to perform rear positioning on the handle.

5. A safety interlock device for a power saw according to claim 2 or 3, wherein: a U-shaped frame straddling the shell of the handpiece is arranged above the handle, and one side of the U-shaped frame is fixed with the upper end of the handle.

6. A safety interlock device for a power saw according to claim 1, 2 or 3, wherein: the hook groove is an arc hook groove, and the hook platform is an arc hook platform.

Images