CN102848016B - Portable cutter - Google Patents

Abstract

The invention provides a kind of portable cutter, comprise, saw blade, there is saw blade plane; Drive the motor of saw blade; Housing; Movably be installed on the guard shield on housing, guard shield is provided with saw blade through hole and is provided for saw blade and extends there through, guard shield movably moves between the first position and the second position relative to housing, when guard shield is positioned at primary importance, saw blade does not pass from saw blade through hole, when guard shield is positioned at the second place, saw blade passes from saw blade through hole; Be arranged on the switch module on housing, switch module has the control on-off circuit of motor, the trigger member of exercisable triggered switch circuit and lock piece, lock piece has the latched position simultaneously locking guard shield and trigger member position, and discharging the off-position of guard shield and trigger member simultaneously, lock piece also has release guard shield and locks the centre position of trigger member.Nationality has centre position by switch module, and realizing user cannot triggered switch circuit when observing saw blade, improves processing safety.

Description

Portable cutter

Technical field

The present invention relates to a kind of power tool, especially relate to a kind of portable cutter.

Background technology

Existing portable cutter, as portable electric annular saw comprises saw blade, for driving the motor of described saw blade, the transmission mechanism between described saw blade and described motor, and the housing of collecting motor, transmission mechanism and part saw blade.The position of the described saw blade of described housing collecting part is provided with guard shield, and described guard shield can move realization relative to described housing and expose described saw blade, or is housed in completely by described saw blade in space that described guard shield and described housing surround.

User, by the switch of the described portable electric annular saw of operation, just can start described motor, thus carry out cutting work.But, in some cases, user needs the abrasion condition of the sawtooth observing described saw blade, or whether need to expose described saw blade enough to observe current cutting-in, now described switch is in the state that can trigger all the time, if observing described saw blade or observing in the process of cutting-in, trigger unintentionally described switch, then can bring great Personal Risk to user.

Summary of the invention

In view of this, the present invention is for a kind of portable cutter of handling safety.

In order to solve the problem, the invention provides a kind of portable cutter, comprising, saw blade, there is saw blade plane; Drive the motor of described saw blade; Housing; Movably be installed on the guard shield on described housing, described guard shield is provided with saw blade through hole and is provided for described saw blade and extends there through, described guard shield movably moves between the first position and the second position relative to described housing, when described guard shield is positioned at described primary importance, described saw blade does not pass from described saw blade through hole, when described guard shield is positioned at the described second place, described saw blade passes from described saw blade through hole; Switch module is on the housing installed, described switch module has the on-off circuit controlling described motor, the trigger member of the described on-off circuit of exercisable triggering and lock piece, described lock piece has the latched position simultaneously locking guard shield and described trigger member position, and discharging the off-position of described guard shield and described trigger member simultaneously, described lock piece also has release guard shield and locks the centre position of described trigger member.

Preferably, described lock piece has the first axle perpendicular to described saw blade plane, and exercisable the rotation relative to described first axle of described lock piece is in described latched position, described centre position or described trigger position.

Preferably, when described lock piece is in described latched position or centre position, the torque produced described lock piece with joint efforts that described lock piece is subject to described trigger member applied pressure is zero.

Preferably, when described lock piece is in described centre position, what described lock piece was subject to described trigger member applied pressure makes a concerted effort to create the torque that described lock piece is moved towards described latched position.

Preferably, described trigger member has second axis parallel with described first axle, and exercisable the rotation relative to described second axis of described trigger member is in the trigger position triggering described on-off circuit, do not trigger the original position of described on-off circuit, described lock piece has can the first stopper section of trigger member described in backstop, when described lock piece is in described centre position or described off-position, described first stopper section is positioned at described trigger member around described second axis towards on the path that described trigger position rotates.

Preferably, described lock piece has the second stopper section for guard shield described in backstop, and only when described lock piece is in described latched position, described second stopper section is positioned at described guard shield towards on the path of described second place movement.

Preferably, the distance between described first axle and described second axis is greater than 10mm, and is less than 25mm.

Preferably, the rotational angle that described lock piece turns to described off-position process from described latched position is greater than 5 degree, and is less than 15 degree.

Preferably, the exercisable direction along vertical described saw blade plane of described lock piece is moved, and realizes being in described latched position, described centre position or described trigger position.

Preferably, described lock piece comprises the lock piece connecting portion extended along the direction lengthwise perpendicular to described saw blade plane, and the radial direction along described lock piece connecting portion extends and is respectively used to the first stopper section of trigger member described in backstop and the second stopper section for guard shield described in backstop.

Described portable cutter has the described lock piece of described latched position, described centre position and described off-position by arranging, realize user and described lock piece can be arranged on described centre position, maloperation can start portable cutter to observe the state of described saw blade without the need to worry, so arrange and greatly improve user operation security.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, further detailed description is done to the present invention.

The stereogram of the portable cutter that Fig. 1 provides for first embodiment of the invention, wherein guard shield is in primary importance;

Fig. 2 is the stereogram of portable cutter described in Fig. 1, and wherein, guard shield is in the second place to expose saw blade;

Fig. 3 is the top view of portable cutter described in Fig. 1;

Fig. 4 is the stereo amplification figure of the guard shield of portable cutter described in Fig. 1;

The lock piece that Fig. 5 is portable cutter described in Fig. 1 and the stereo decomposing enlarged drawing of the first reposition element;

The trigger member that Fig. 6 is portable cutter described in Fig. 1 and the stereo decomposing enlarged drawing of the second reposition element;

The trigger member that Fig. 7 is portable cutter described in Fig. 1 and lock piece connect schematic diagram;

Fig. 8 is the cross-sectional schematic of the linearly I-I of portable cutter described in Fig. 3, and wherein lock piece is in latched position;

Fig. 9 is the cross-sectional schematic of the linearly I-I of portable cutter described in Fig. 3, and wherein lock piece mediates;

Figure 10 is the cross-sectional schematic of the linearly I-I of portable cutter described in Fig. 3, and wherein lock piece is in off-position;

The partial cutaway view schematic of the portable cutter that Figure 11 provides for second embodiment of the invention;

The lock piece that Figure 12 is portable cutter described in Figure 11 coordinates schematic diagram with guard shield, and wherein, lock piece is in the latched position of locking guard shield and trigger member;

The lock piece that Figure 13 is portable cutter described in Figure 12 coordinates schematic diagram with trigger member;

The lock piece that Figure 14 is portable cutter described in Figure 11 coordinates schematic diagram with guard shield, and wherein, lock piece is in locking trigger member and discharges the centre position of guard shield;

The lock piece that Figure 15 is portable cutter described in Figure 14 coordinates schematic diagram with trigger member;

The lock piece that Figure 16 is portable cutter described in Figure 11 coordinates schematic diagram with guard shield, and wherein, lock piece is in the off-position simultaneously discharging guard shield and trigger member;

The lock piece that Figure 17 is portable cutter described in Figure 16 coordinates schematic diagram with trigger member.

Wherein:

10. portable cutter 16. guard shield 22. head capsule

12. housing 17. saw blade plane 24. connecting portions

14. saw blade 18. switch module 26. motor shells

15. sawtooth 20. tool drives axle 28. housing mating parts

30. grip stopper section 66. connecting wall 88. limiting section

42. generating laser 67. on-off circuit 90. second press sections

44. head capsule sidewall 68. trigger member 91. second reposition elements

45. locating part 70. lock piece 92. second rotating shafts

46. depth adjusting mechanism 71. first reposition element 94a. first confined planes

48. fluting 72. rotation section 94b. second confined planes

50. adjusting part 74. first stopper section 94c. the 3rd confined planes

51. guard shield resetting-mechanism 76. second stopper section 96. spacing block sets

52. base plate 78. first press section O-O. first axles

54. guide rail 80. first rotating shaft R-R. second axis

56. saw blade host cavity 82a. first stop surface H-H. axis

58. abutment face 82b. second stop surface F. pressure

60. saw blade through hole 82c. the 3rd stop surface F '. make a concerted effort

62. spacing preiections 84. keep out end

Face 86. pivot part kept out by 64. guard shields

Specific embodiment

Refer to Fig. 1, first embodiment of the invention provides a kind of portable cutter 10 to comprise housing 12, be housed in the motor (not shown) in housing 12, be positioned at housing 12 by the power transmission of motor to the transmission component (not shown) of saw blade 14, install on housing 12 and the guard shield 16 that can slide relative to housing 12, and be positioned at the switch module 18 housing 12 controlling motor and whether work.

The power supply of portable cutter 10 is AC power, namely by AC power to motor power supplying, now portable cutter 10 has stronger power, and does not limit by electricity, is applicable to work long hours.Certain portable cutter 10 also can adopt direct current energy to power, namely on portable cutter 10, power brick is installed, by power brick to motor power supplying, now portable cutter 10 portability is better, it can not be subject to the impact of power line, and user can carry portable cutter 10 and carry out cutting work in any place.

Motor can be carbon brush motor, brushless motor etc., or corresponds to the energy source of portable cutter 10, and motor can be alternating current motor or d.c. motor.Motor has motor output shaft (not shown), and the rotation of motor is exported by installing gear on motor output shaft.

Transmission component and motor output shaft connect, and the rotation that motor output shaft exports is passed to saw blade 14.Transmission component comprises the tool drives axle 20 for installing saw blade 14, and tool drives axle 20 has axis H-H.Saw blade 14 is installed on one end of tool drives axle 20, and the other end of tool drives axle 20 can be connected by the gear of direct geared and motor output shaft, realizes motor-driven tool driving shaft 20 and rotates.Certainly, between motor output shaft and tool drives axle 20, can also reduction gearing etc. be set, no longer describes in detail as space is limited at this.With the axis perpendicular of motor output shaft or can be arranged in parallel about axis H-H, in the present embodiment, axis H-H is mutually vertical with the axis of motor output shaft.

See also Fig. 1, Fig. 2 and Fig. 3, saw blade 14 is saw blade, it has the sawtooth 15 that circumference is arranged, and two parallel saw blade planes 17 (only illustrating in figure) are defined in sawtooth 15 inside, saw blade plane 17 is perpendicular with the axis H-H of tool drives axle 20, thus saw blade plane 17 is parallel to each other with the lengthwise bearing of trend of housing 12.The central area of saw blade plane 17 is provided with installing hole, for saw blade 14 is fixedly mounted on portable cutter 10.

Housing 12 entirety extends along the first lengthwise bearing of trend vertical with axis H-H, and comprises and be positioned at housing 12 one end and accommodate the head capsule 22 of part saw blade 14 and the motor shell 26 of the other end.

Motor shell 26 for accommodating fixing motor, and is provided with air inlet (not shown) and air outlet (not shown) on motor shell 26.

The part be connected with head capsule 22 at motor shell 26 forms connecting portion 24.Connecting portion 24 partial receipt transmission component, and in order to the structure of Appropriate application connecting portion 24 more, connecting portion 24 is designed to the grip part of portable cutter 10, namely user carries out cutting work by holding grip part operation portable cutter 10, because holding area is between head capsule 22 and motor shell 26, namely grip part and head capsule 22 adjacent.User is equivalent to when holding grip part constitute fulcrum between head capsule 22 and motor shell 26, the part of fulcrum both sides mutually can restrict under respective gravity effect, realize after user holds grip part, portable cutter 10 is in more stable state, be very easy to carry out cutting operation, improve the comfort level of operation, preferably, the center of gravity of portable cutter 10 is positioned on grip part, and now portable cutter 10 has best operational comfort.

Certainly; grip part is not limited to be formed in connecting portion 24, also can form grip part for motor shell 26, and those skilled in the art also may make other and change; as long as but its function and effect and the present invention same or similar, all should be covered by scope.

Head capsule 22 for installing guard shield 16, and can accommodate part transmission mechanism and collecting part saw blade 14.The tool drives axle 20 of transmission mechanism is contained in head capsule 22, and head capsule 22 has the opening for connecting with guard shield 16, and saw blade 14 part is goed deep in opening, and is mounted on tool drives axle 20.

Head capsule 22 is provided with generating laser 42.Generating laser 42 can send laser, and laser forms a line of cut at surface of the work, namely when user promote portable cutter 10 carry out cutting work time, saw blade 14 can cut along line of cut, so arranges the cutting accuracy that improve user.

Head capsule 22 has two head capsule sidewalls 44 vertical with the axis H-H of tool drives axle 20, namely the bearing of trend of two head shell side walls 44 and the saw blade plane 17 of saw blade 14 parallel, and two head shell side walls 44 lay respectively at the side of saw blade 14.The locating part 45 for coordinating with guard shield 16 is respectively arranged with back to the surface of saw blade 14 at each head capsule sidewall 44.After guard shield 16 is mounted to head capsule 22, it can coordinate with locating part 45 and realizes sliding within the specific limits relative to head capsule 22.In the present embodiment, locating part 45 is the bearing be installed on by screw on head capsule sidewall 44, and the quantity of each head capsule sidewall 44 upper limit part 45 is three, highly stable when guard shield 16 so can be made to slide relative to head capsule 22.

Further, in order to realize the cutting of depthkeeping degree, head capsule 22 is provided with depth adjusting mechanism 46, and it can realize carrying out spacing in different depth position to guard shield 16, thus realizes depthkeeping cutting.Depth adjusting mechanism 46 can be positioned at above any one head capsule sidewall 44, two head shell side walls 44 can certainly be provided with depth adjusting mechanism 46 respectively.In the present embodiment, only a head shell side wall 44 arranges depth adjusting mechanism 46 wherein, this depth adjusting mechanism 46 is included in the fluting 48 on head capsule sidewall 44 and the adjusting part 50 also can located at an arbitrary position that can slide fluting 48 in.Be provided with the scale indicating cutting-in near the position of fluting 48 at head capsule sidewall 44.Adjusting part 50 comprises and is positioned at the inner installing plate (not shown) of head capsule 22, is connected with installing plate and has the spanner of cam surface, and is connected the pointer being used to indicate current scale with installing plate.Spanner is exercisable is exerted pressure to head capsule sidewall 44 by cam surface, is clamped between cam surface and installing plate by head capsule sidewall 44, thus realizes the location of adjusting part 50, and the scale now indicated by pointer is the degree of depth that portable cutter 10 cuts.

See also Fig. 1 and Fig. 8, between head capsule 22 and guard shield 16, be provided with guard shield resetting-mechanism 51.In the present embodiment, it is inner that guard shield resetting-mechanism 51 is arranged on head capsule 22, its always to head capsule 22 and guard shield 16 apply to make the two away from power.

Guard shield 16 can accommodate saw blade 14 jointly with head capsule 22, and it can slide relative to head capsule 22, makes guard shield 16 have primary importance and the second place.Wherein, guard shield resetting-mechanism 51 applies the power making the two be separated from each other to guard shield 16 and head capsule 22, be and guard shield 16 is moved towards the second place.As shown in Figure 1, when guard shield 16 is in primary importance, saw blade 14 entirety is housed in the space that guard shield 16 and head capsule 22 surround, and as shown in Figure 2, when guard shield 16 is in the second place, saw blade 14 stretches out guard shield 16 can carry out cutting work.

See also Fig. 1, Fig. 2 and Fig. 4, guard shield 16 comprise for against workpiece base plate 52, for coordinate with locating part 45 guide rail 54, for accommodating the saw blade host cavity 56 of saw blade 14.

Base plate 52 has for the abutment face 58 against workpiece, and when portable cutter 10 cut workpiece, abutment face 58 is resisted against surface of the work, and can slide relative to surface of the work, makes saw blade 14 cut workpiece.Base plate 52 is also provided with saw blade through hole 60 be provided for saw blade 14 and extend there through, when guard shield 16 is positioned at primary importance, saw blade 14 does not pass from saw blade through hole 60, and when guard shield 16 is positioned at the second place, saw blade 14 passes from saw blade through hole 60.

Guide rail 54 is installed on base plate 52, and for coordinating with locating part 45, realizing guard shield 16 can slide relative to head capsule 22.In the present embodiment, the quantity of guide rail 54 is two, when guard shield 16 is assembled to portable cutter 10, two guide rails 54 coordinate with the locating part 45 be arranged on two head shell side walls 44 respectively, guard shield 16 is slided relative to portable cutter 10, and saw blade host cavity 56 can be contained in head capsule 22 inside.Simultaneously, guide rail 54 is provided with spacing preiection 62, when guard shield 16 is along after locating part 45 slides certain distance, spacing preiection 62 can prop up on the cam surface of depth adjusting mechanism 46, thus realizes depthkeeping cutting.

Face 64 kept out by guard shield guard shield 16 is provided with for coordinating with switch module 18, and namely guard shield is kept out face 64 and can be moved towards the second place to stop guard shield 16 by switch module 18 backstop, so realizes guard shield 16 and is locked in primary importance.In the present embodiment, guard shield is kept out face 64 and is arranged on the position that base plate 52 closes on grip part, and guard shield keeps out face 64 back to abutment face, so arranges and is structurally convenient to very much design, and the easy position coordinating to realize locking guard shield 16 with switch module 18.

In order to make the structure of guard shield 16 more durable, connecting wall 66 is set between two guide rails 54, and connecting wall 66 protrudes base plate 52 connect two guide rails 54 from base plate 52 near the edge of grip part, face 64 is kept out back to the end face formation guard shield of base plate 52 at connecting wall 66, setting like this and improve guard shield 16 integrated stress intensity, portable cutter 10 can be realized again there is guard shield 16 lock function, improve the security that product uses.

Seeing also Fig. 1, Fig. 2 and Fig. 3, in order to improve the safety in utilization of portable cutter 10, between guard shield 16 and grip part, being provided with the gripping stopper section 30 that backstop user points, thus prevent guard shield 16 from moving process, squeezing the finger of hindering user.In the present embodiment, when guard shield 16 is in primary importance or the second place, guard shield 16 partly overlaps with the bearing of trend of housing 12 along axis H-H, wherein when guard shield 16 is in the second place and has maximum cutting-in, the two part along axis H-H overlap reaches maximum, the region that now housing 12 is overlapping with guard shield 16 is housing mating part 28, gripping stopper section 30 is arranged between housing mating part 28 and grip part, so realize portable cutter 10 and be in any cutting-in, the finger of user well can both be held stopper section 30 backstop and can not be squeezed wound by guard shield 16.

When user grips portable cutter 10, finger very naturally can be resisted against and grip on stopper section 30, now just avoid when guard shield 16 is towards in the process of second place movement, the finger of user is squeezed wound by guard shield 16, thus realize improve safety in utilization, and grip the region that stopper section 30 clearly defines grip part, make the correct holding mode of user's definitely portable cutter 10.In the present embodiment, when guard shield 16 is in the second place, guide rail 54 is overlapped along axis H-H with housing 12, forms housing mating part 28 on housing 12.

Grip stopper section 30 and protrude housing 12 along the direction of the H-H that parallels to the axis, thus gripping stopper section 30 is had back to head capsule 20 and saw blade 14 and bears the stress surface (sign) of pressure, when user promotes portable cutter 10 cut workpiece, pressure can be applied to stress surface, now identical with the direction of motion of portable cutter 10 owing to executing stressed direction, user only need apply very little strength and just can promote portable cutter 10 and cut forward.The present invention greatly improves operational comfort compared to conventional art.In conventional art, user firmly holds grip part and drives cutting machine to carry out cutting work by the frictional force between hand and grip part, now the pushing phase of user is firmly easily tired out, and hand can easily slide relative to grip part after perspiring under normal circumstances, now the guard shield of the easy cut machine of the non-constant of operational comfort and hand is accidentally injured.Stopper section 30 is gripped by arranging on grip part in the present invention, user just can easily promote portable cutter 10 without the need to firmly gripping grip part, and when the hand of user is perspired, hand stops even if also can be held stopper section 30 relative to grip part slip, well serve anti-skidding effect, and improve the security of operation.

In the present embodiment, coordinate with the head capsule sidewall 44 of saw blade 14 both sides respectively because guard shield 16 has two guide rails 54, housing 12 is formed with two housing mating parts 28 thus, therefore housing 12 has two gripping stopper sections 30 and lays respectively at the both sides of saw blade 14.Two gripping stopper sections are respectively and grip stopper section 30a for first of backstop user thumb, and grip stopper section 30b for second of other fingers of backstop user, the very effectively and targetedly backstop finger of user is so set, and while realizing this backstop function, also there is the advantage of the simple and low cost of structure.

Certainly, grip stopper section 30 after protrusion housing 12, circumference one circle that can be set to along grip part protrudes from surface, grip part, also can be some projections protruding from grip part, in the present embodiment, first grips stopper section 30a and second gripping stopper section 30b is separately positioned between grip part and housing mating part 28, namely grip stopper section 30 and define grip part and housing mating part 28 zone line, and the first gripping stopper section 30a and second gripping stopper section 30b extends to form fin continuously along the circumference of grip part respectively.Thus have preferably grip comfort level when gripping.Preferably, grip stopper section 30 and there is the second lengthwise bearing of trend, and the second lengthwise bearing of trend is vertical with the first lengthwise bearing of trend, and the first gripping stopper section 30a and second gripping stopper section 30b simultaneously diffraction second longitudinally extends in the same way, setting like this, while improve processing safety, grip comfort level and reach best.

In order to further improve the gripping comfort level of portable cutter 10, each gripping stopper section is connected with adopting arc transition between grip part, so arranges, and is more suitable for user's hand and grips, meet ergonomic designs.

The height that grip part is protruded in gripping stopper section 30 is greater than 5mm, and be less than 20mm, within the scope of this, grip stopper section 30 and can carry out sufficient backstop to user's finger, and the volume of portable cutter 10 can not be affected, more can not reduce portable cutter 10 carries out cutting work suitable application region at some small spaces, namely can not affect the accessibility of portable cutter 10.Preferably, the height that grip part is protruded in gripping stopper section 30 is 10mm, and now user's handling comfort level and backstop effect reach best.

In the present embodiment, grip stopper section 30 and adopt integrative-structure to make with grip part, so make simple, and sturdy and durable.Certainly, other structures can also be arranged in gripping stopper section 30 in the present invention, it can adopt split design with housing 12, and by some position-limit mechanisms, gripping stopper section 30 is mounted to grip part, and the material gripping stopper section 30 can be plastics, rubber or resin etc., also can be the metal material such as aluminium alloy or stainless steel.The height that grip part is protruded in gripping stopper section 30 also can set according to actual needs, as long as it can be known define grip part, place, and can stop that the finger of user prevents it from being accidentally injured by guard shield 16.Those skilled in the art also may make other design under the enlightenment of the technology of the present invention marrow, as long as but its function realized and the effect that reaches and the present invention same or similar, all should be covered by scope.

Certainly, corresponding to the axis of motor output shaft and the axis H-H of tool drives axle 20 is parallel or situation about overlapping, usually on head capsule 22, be formed with handle, and form grip part on handle, it is substantially identical with foregoing description that it arranges the structure gripping stopper section 30, no longer repeats at this.

Portable cutter 10 grips stopper section 30 by arranging, realize can the finger of backstop user to prevent from being extruded by guard shield 16, thus improve the safety in utilization of user.

See also Fig. 1 and Fig. 8, switch module 18 is installed between grip part and head capsule 22, and be positioned at the side of portable cutter 10 back to user, it comprise control motor and whether work on-off circuit 67, exercisable triggered switch circuit 67 trigger member 68 and the lock piece 70 of guard shield 16 and trigger member 68 can be locked.

See also Fig. 3, Fig. 5 and Fig. 8, lock piece 70 comprise be rotationally connected with housing 12 rotation section 72, can backstop trigger member 68 movement the first stopper section 74, can backstop guard shield 16 movement the second stopper section 76 and be depressed by the user the first press section 78 that lock piece 70 is rotated around rotation section 72.Exerting pressure to the first press section 78 of user-operable, makes lock piece 70 have the latched position simultaneously locking guard shield 16 and trigger member 68, the off-position simultaneously discharging guard shield 16 and trigger member 68, and release guard shield 16 lock the centre position of trigger member 68.Setting like this greatly improves the safety in utilization of portable cutter 10, simultaneously easy and simple to handle.

Rotation section 72 has the first rotating shaft 80, and namely lock piece 70 is installed on housing 12 by the first rotating shaft 80, and lock piece 70 can be made to be in latched position, off-position or centre position around the first rotating shaft 80 rotation.In the present embodiment, first rotating shaft 80 has the first axle O-O of vertical saw blade plane 17, make the rotation direction of lock piece 70 parallel with saw blade plane 17, so be set using when family grips portable cutter 10 and very easily just can operable lock stop member 70 rotate, and realize lock piece 70 and change between the different positions.

First reposition element 71 is also installed between the first rotating shaft 80 and housing 12, first reposition element 71 provides the power that lock piece 70 is moved towards latched position all the time to lock piece 70, thus realize when user completes cutting work, portable cutter 10 automatically locks the position of guard shield 16 and trigger member 68, thus avoid the unconscious maloperation of user and cause personal injury, greatly improve security.In the present embodiment, the first reposition element 71, for being set in the torsion spring in the first rotating shaft 80, so arrange structure simple, and cost is lower.Certain first reposition element 71 also can adopt other technologies scheme, as arranged spring etc. between lock piece 70 and housing 12, introduces no longer one by one as space is limited at this, but the technical scheme realizing this function all should be covered by scope.

First stopper section 74 is connected with rotation section 72, and when lock piece 70 is in latched position, trigger member 68 can be kept out in the first stopper section 74, to stop trigger member 68 triggered switch circuit 67.In the present embodiment, first stopper section 74 has the stop surface that can abut against with trigger member 68, stop surface is positioned at the side of the first stopper section 74 back to the first rotating shaft 80, when trigger member 68 is by lock piece 70 backstop, stop surface and trigger member 68 abut against, and now realize stoping trigger member 68 position to be moved.

See also Fig. 5, Fig. 7 and Fig. 8, portable cutter 10 in an initial condition, lock piece 70 is in latched position, now user applies pressure F to trigger member 68, under the effect of pressure F, trigger member 68 can abut against with the first stopper section 74, and apply pressure to stop surface, that now sets stop surface to be under pressure makes a concerted effort as F ', then the direction of F ' is vertical with first axle O-O with joint efforts, and the bearing of trend of the F ' that makes a concerted effort is through first axle O-O, or the F ' that makes a concerted effort creates the torque that lock piece 70 is moved towards latched position direction.

When the bearing of trend of the F ' that makes a concerted effort is vertical with first axle O-O coplanar, the torque that the F ' that makes a concerted effort acts on the first rotating shaft 80 generation is zero, and the F ' that now makes a concerted effort cannot drive lock piece 70 to rotate around first axle O-O, when the bearing of trend of the F ' that makes a concerted effort is vertical with first axle O-O antarafacial, make a concerted effort F ' act on first rotating shaft 80 produce torque be greater than zero, but torque is rotated towards latched position for making lock piece 70, because the second stopper section 76 of now lock piece 70 can be resisted against on head capsule 22, so make lock piece 70 further cannot rotate around first axle O-O towards the direction of latched position under the impact of torque, thus the position realizing lock piece 70 is defined, as can be seen here when the bearing of trend of the F ' that makes a concerted effort is through first axle O-O, or when the torque that the F ' that makes a concerted effort produces is for making lock piece 70 move towards latched position direction, lock piece 70 can be stable be in latched position, and then the firm position having locked guard shield 16 and trigger member 68.

Certainly, as made a concerted effort, F ' also may create the torque that lock piece 70 is moved towards off-position, but when torque is very little or level off to zero time, torque can by the frictional force between lock piece 70 and trigger member 68 or the first reposition element 71 offset, cause lock piece 70 cannot move towards off-position, thus realize locking trigger member 68.Under marrow of the present invention enlightenment, those skilled in the art also may make other design, will not enumerate at this, as long as but its function and effect and the present invention is same or similar all should be covered by scope.

First stopper section 74 can comprise multiple stop surface, in the present embodiment, first stopper section 74 comprises and the first stop surface 82a of the axis being parallel of the first rotating shaft 80, the second stop surface 82b and the 3rd stop surface 82c, and the distance of the first axle O-O of the first stop surface 82a, the second stop surface 82b and the 3rd stop surface 82c to the first rotating shaft 80 reduces gradually, now nationality defines three step surfaces by the first stop surface 82a, the second stop surface 82b and the 3rd stop surface 82c.When lock piece 70 and trigger member 68 abut against, when limiting the position of trigger member 68, the first stop surface 82a, the second stop surface 82b and the 3rd stop surface 82c abut against with trigger member 68 simultaneously.Owing to have employed the mode that three stop surfaces abut against with trigger member 68 simultaneously, thus make the spacing highly stable of guard shield 16, simultaneously compared to the situation of the stop surface only arranged in above-mentioned three stop surfaces, the area arranging three stop surfaces is larger, thus realize the pressure of unit are on stop surface and relatively diminish, make lock piece 70 be not easy to damage, extend service life.Moreover, because stop surface is made up of multiple step surface, when applying pressure to the first press section 78 and making lock piece 70 rotate relative to first axle O-O, only need lock piece 70 to rotate less angle and just realize stop surface and trigger member 68 is separated to discharge trigger member 68.

Be appreciated that; the quantity of stop surface also can be one, two, four and five etc.; its concrete quantity can be arranged according to concrete structure; its basic structure is substantially identical with the structure arranging three stop surfaces; no longer be described in detail as space is limited at this, certainly, those skilled in the art also may make other and change under the enlightenment of the technology of the present invention marrow; as long as but its function realized and the effect that reaches and the present invention same or similar, all should be covered by scope.

Second stopper section 76 is connected with rotation section 72, for keeping out guard shield 16, slides relative to housing 12 to stop guard shield 16.In the present embodiment, second stopper section 76 extends along the radial direction of the first rotating shaft 80, its have can keep out guard shield 16 keep out end 84, when lock piece 70 is in latched position, keep out the guard shield that end 84 is positioned at guard shield 16 and keep out face 64 towards on the path of second place movement, and abut against by keeping out face 64 with passport, realize stoping guard shield 16 relative to housing 12 towards the second place motion of exposing saw blade 14.

Certainly, because the first reposition element 71 applies towards the power in latched position direction to lock piece 70 all the time, even if when lock piece 70 is in latched position, also the power having some is applied on lock piece 70, therefore when lock piece 70 is in latched position, the second stopper section 76 can and guard shield keep out while face 64 abuts against, also can be resisted against on head capsule 22, now nationality is limited by the position of head capsule 22 pairs of lock pieces 70, makes its stable being in the locked position.

First press section 78 has the stress surface parallel with the first axle O-O of the first rotating shaft 80, user-operable to stress surface apply pressure, make lock piece 70 around pivot axis.Preferably, more reliable and more stable when exerting pressure to stress surface to make user, anti-skid structure can be set on stress surface surface, as arranged nonskid coating or arrange the fin etc. slightly protruding from stress surface surface on stress surface.

When lock piece 70 turns to off-position from latched position, lock piece 70 needs the angle of rotating for being greater than 5 degree, and can be less than 15 degree, so, vibrational power flow can be made comparatively compact, and user has preferably operability.Preferably, the rotational angle of lock piece 70 is 10 degree, and now user has operability as snug as a bug in a rug.

Refer to Fig. 6, Fig. 7 and Fig. 8, trigger member 68 is for exercisable triggered switch circuit 67, and then realization control portable cutter 10 carries out work, it can rotate relative to housing 12, realize the trigger position that trigger member 68 has triggered switch circuit 67, and the original position of non-triggered switch circuit 67.In the present embodiment, on-off circuit 67 is connected with power supply and motor, when on-off circuit 67 be triggered part 68 trigger time, namely trigger member 68 moves to trigger position, now on-off circuit 67 can allow power supply to motor power supplying, thus realize motor drive saw blade 14 carry out cutting work.When trigger member 68 is released, namely trigger member 68 moves to original position, and now on-off circuit 67 can be electrically connected with the confession of motor by deenergization, and motor is quit work.

In the present embodiment, trigger member 68 comprises: the second press section 90 being contained in the pivot part 86 in housing 12, limiting section 88 and being partly exposed to outside housing 12.

Trigger member 68 is mounted to housing 12 by pivot part 86, thus realizes trigger member 68 and can rotate relative to housing 12.In the present embodiment, pivot part 86 is rotationally connected with housing 12 by the second rotating shaft 92.

See also Fig. 3 and Fig. 6 and Fig. 7, second rotating shaft 92 has the second axis R-R that and disalignment parallel with first axle O-O is arranged, trigger member 68 is pressed when user-operable, it is made to rotate around the second axis R-R, now limiting section 88 also can move towards trigger position along with trigger member 68, when lock piece 70 is in latched position or centre position, due to the first stopper section 74 be positioned at limiting section 88 towards trigger position rotate path on, thus realize trigger member 68 by lock piece 70 backstop, and the position limiting trigger member 68 makes it cannot triggered switch circuit 67.

Distance between second axis R-R and first axle O-O is greater than 10mm, and be less than 25mm, now the space that takies in housing 12 of lock piece 70 and trigger member 68 is less, housing 12 inner space is arranged comparatively reasonable, and housing 12 overall dimensions can not be made too large, the gripping comfort level of user can not be affected.Preferably, the distance between the second axis R-R and first axle O-O is 16mm, and now in housing 12, space utilization is the most reasonable, and has best gripping comfort level.

Limiting section 88 is connected between pivot part 86 and the second press section 90, has and abuts against with lock piece 70 confined planes limiting trigger member 68 position.Confined planes is positioned at the side of limiting section 88 towards housing 12 inside, namely when trigger member 68 moves from original position to trigger position, confined planes can towards the direction of motion, and can abut to lock piece 70 realize hinder trigger member 68 move towards trigger position, the position so realizing trigger member 68 is locked, when user carries out the operation such as replacing saw blade 14, adjustment cutting-in, just portable cutter 10 can not be started because of maloperation, thus avoid maloperation and cause portable cutter 10 couples of users to produce injury, and then improve processing safety.

Second reposition element 91 is installed between trigger member 68 and housing 20, and the second reposition element 91 applies towards the power of original position motion to trigger member 68 all the time.In the present embodiment, the second reposition element 91, for being arranged at the spring in trigger member 68, is so arranged, and structure is simple, easy processing and manufacturing.Certainly; second reposition element 91 can also adopt other technical scheme to realize; as arranged torsion spring etc. in the second rotating shaft 92; those skilled in the art also may make other and change; no longer make introductions all round as space is limited at this, as long as but its function and effect and the present invention is same or similar all should be covered by scope.

The first stopper section 74 corresponding to lock piece 70 has the structure of multiple stop surface, limiting section 88 also can have multiple confined planes accordingly, in the present embodiment, the quantity of confined planes is three, be respectively the first confined planes 94a, the second confined planes 94b and the 3rd confined planes 94c, and corresponding first confined planes 94a can be spacing by the first stop surface 82a backstop, second confined planes 94b can be spacing by the second stop surface 82b backstop, and the 3rd confined planes 94c can be spacing by the 3rd stop surface 82c backstop.The quantity of certain confined planes is not limited to foregoing description; when the quantity of stop surface changes; the quantity of confined planes arranges and also can change accordingly; and those skilled in the art also the quantity of confined planes or structure may make other and change under the enlightenment of the technology of the present invention marrow, as long as but its function and effect and the present invention is same or similar all should be covered by scope.

Second press section 90 has and the stress surface that be exposed to housing 12 outside parallel with the second axis R-R, user-operable apply pressure to stress surface, trigger member 68 is rotated, to realize turning to trigger position from original position around the second axis R-R.Preferably, more reliable and more stable when exerting pressure to stress surface to make user, anti-skid structure can be set on stress surface surface, as arranged nonskid coating or arrange the fin etc. slightly protruding from stress surface surface on stress surface.

End in the second press section 90 away from the second rotating shaft 92 is provided with spacing block set 96.Spacing block set 96 protrudes from the second press section 90 for coordinating with housing 12, realizes the rotational angle range of trigger member 68, prevents trigger member 68 excessive around the rotational angle of the second rotating shaft 92, as whole second press section 90 exposes housing 12 outside.So improve comfort by arranging spacing block set 96.

Refer to Fig. 1 and Fig. 8, in an initial condition, lock piece 70 is in latched position to portable cutter 10, and now user cannot press trigger member 68 to start portable cutter 10, and guard shield 16 also cannot be made to move to expose saw blade 14 relative to housing 12, refer to Fig. 2 and Fig. 9, when user operation portable cutter 10 carries out cutting work, first can press the first press section 78 makes lock piece 70 rotate around the first rotating shaft 80, in lock piece 70 rotation process, first the second stopper section 76 to be no longer resisted against on head capsule 22 and and pull open certain distance between head capsule 22, cause the second stopper section 76 cannot keep out face 64 with the guard shield of guard shield 16 to abut against, namely be in can freely relative to the release conditions of head capsule 22 movement for guard shield 16, but the stop surface of lock piece 70 still can keep out the confined planes of trigger member 68, make trigger member 68 cannot turn to trigger position relative to the second rotating shaft 92, namely the position of trigger member 68 has been locked, now lock piece 70 is in centre position, user can operate guard shield 16 and observe saw blade 14, also base plate 52 can be resisted against the edge of work makes saw blade 14 expose to outside the edge of workpiece, whether the cutting-in of now observing saw blade 14 is suitable, so can make user that the cutting-in of portable cutter 10 is set more accurately, refer to Figure 10, when user continues pressing first press section 78, lock piece 70 is made to continue to rotate relative to the first rotating shaft 80, make between the confined planes of the stop surface of lock piece 70 and trigger member 68, to have pulled open enough distances, user presses trigger member 68 can not can triggered switch circuit 67 by stop surface backstop, now lock piece 70 is in off-position, and user can use portable cutter 10 to carry out cutting work.

Certainly, lock piece 70 and trigger member 68 also can be rotated around same axis, make lock piece 70 be in latched position, centre position and off-position, and make trigger member 68 be in original position and off-position.Namely on lock piece 70, be provided with cam surface, when lock piece 70 moves towards off-position, cam surface can towards the direction of motion; Being provided with in housing 12 can along the stop part of the first lengthwise bearing of trend movement, when lock piece 70 is positioned at latched position or centre position, stop part is positioned on the rotation path that trigger member 68 rotates towards trigger position, so realizes making trigger member 68 cannot triggered switch circuit 67; When user operation lock piece 70 moves to off-position, cam surface can apply pressure to stop part, stop part is moved along the first lengthwise bearing of trend, and departs from the path that trigger member 68 moves towards trigger position, now realizing trigger member 68 can triggered switch circuit 67.So, by arranging cam surface and can along the stop part of the first lengthwise bearing of trend movement, realizing lock piece 70 and trigger member 68 when same axis rotates, also can realize lock piece 70 and there is release guard shield 16 and the centre position locking trigger member 68.Further, between stop part and housing 12, can back-moving spring be set, to apply to stop part to make it be in the power of locking trigger member 68 direction motion, thus when user unclamps lock piece 70 and trigger member 68, stop part automatically resets, and ensure that processing safety.

Refer to Figure 11, its portable cutter 100 provided for second embodiment of the invention, portable cutter 100 is substantially identical with the structure of the portable cutter 10 that the first embodiment provides, the element number identical in this structure is identical with the first embodiment, the two difference is: the lock piece 111 of portable cutter 100 can move along the axis H-H of tool drives axle 20 relative to guard shield 16 and trigger member 68, realize the latched position that lock piece 111 is in locking guard shield 16 and trigger member 68 position, release guard shield 16 also locks the centre position of trigger member 68, and discharge the off-position of guard shield 16 and trigger member 68 simultaneously.

See also Figure 11 and Figure 12, lock piece 111 comprises first stopper section 113 that can limit trigger member 68 position, the second stopper section 115 of guard shield 16 position can be limited, stretch out housing 12 and exercisable the first press section 117 being applied in the movement of pressure drive lock piece 111, and connect the lock piece connecting portion 121 of the first stopper section, stopper section 113, second 115 and the first press section 117.

Lock piece connecting portion 121 extends along the direction lengthwise perpendicular to saw blade plane, first stopper section 113 and the second stopper section 117 all extend along the radial direction of lock piece connecting portion 121, and there is the angle being greater than zero degree between the first stopper section 113 and the bearing of trend of the second stopper section 117, difference backstop trigger member 68 and guard shield 16 both so realizing.

The connecting wall 44 of guard shield 16 is provided with the guard shield that can abut against with lock piece 111 and keeps out face 64, and can accommodate the groove 119 of the second stopper section 115 of lock piece 111.When lock piece 111 is in latched position, its second stopper section 115 can be kept out face 64 with guard shield and be abutted against, thus realizes guard shield 16 and be locked in primary importance.Refer to Figure 14 and Figure 16, when lock piece 111 mediate or off-position time, second stopper section 115 aligns with groove 119, namely now guard shield 16 can move to the second place from primary importance, and when guard shield 16 is in the second place, the second stopper section 115 can be housed in groove 119.

See also Figure 12 and Figure 13, when lock piece 111 is in latched position, first stopper section 113 is on the rotation path of trigger member 68, if now user applies pressure to trigger member 68, then pressure acts on torque trigger member 68 creating and rotates around the second axis R-R, and now abut against with trigger member 68 due to the first stopper section 113, make trigger member 68 cannot be turned to trigger position relative to the second axis R-R by stopping, simultaneously, second stopper section 115 of lock piece 111 is kept out face 64 with the guard shield of guard shield 16 and is abutted against, realize the position limiting guard shield 16, realize the position simultaneously locking trigger member 68 and guard shield 16 when lock piece 111 is in latched position thus.

See also Figure 11, 14 and Figure 15, lock piece 111 is made to move to centre position along the axis H-H of tool drives axle 20 when user presses the first press section 117, first stopper section 113 is still positioned on the rotation path of trigger member 68, thus trigger member 68 still cannot be rotated relative to the second axis R-R, therefore still cannot move to trigger position, and now the second stopper section 115 moves to the position corresponding with groove 119 just, so time guard shield 16 is exercisable moves to the second place relative to housing 12 from primary importance, be housed in groove 119 to make the second stopper section 115.Now user can observe the abrasion condition of saw blade, or whether enough to observe saw blade cutting-in, and without the need to worrying that maloperation can start portable cutter 100, so brings facility to user, and has preferably processing safety.

See also Figure 16 and Figure 17, lock piece 111 is made to move to off-position along the axis H-H of tool drives axle 20 when user continues pressing first press section 117, now the first stopper section 113 departs from the rotation path of trigger member 68, so time trigger member 68 can turn to its trigger position relative to the second contour R-R, thus portable cutter 100 can be started carry out cutting work.Simultaneously, the second stopper section 115 is still corresponding with groove 119, and guard shield 16 is exercisable moves to the second place relative to housing 12, and corresponding second stopper section 115 is contained in groove 119, and now saw blade can stretch out guard shield and carries out cutting work.

The 3rd reposition element (not shown) is provided with between lock piece connecting portion 121 and housing 12,3rd reposition element provides the power towards latched position movement to lock piece 111 all the time, thus realize after user unclamps lock piece 111, lock piece automatically returns to latched position, improves safety in utilization.

In the present invention, portable cutter is by arranging the lock piece with latched position, centre position and off-position, realize user and lock piece can be arranged on centre position, maloperation can start portable cutter to observe the state of saw blade without the need to worrying, so arranging and greatly improving user operation security.

The present invention is not limited to aforementioned embodiments, those skilled in the art also may make under the enlightenment of the technology of the present invention marrow other change, as long as but its realize function and the present invention same or similar, all should be covered by scope.

Claims (9)

1. a portable cutter, comprises,

Saw blade, has saw blade plane;

Drive the motor of described saw blade;

Housing;

Movably be installed on the guard shield on described housing, described guard shield is provided with saw blade through hole and is provided for described saw blade and extends there through, described guard shield movably moves between the first position and the second position relative to described housing, when described guard shield is positioned at described primary importance, described saw blade does not pass from described saw blade through hole, when described guard shield is positioned at the described second place, described saw blade passes from described saw blade through hole;

Switch module is on the housing installed, described switch module has the on-off circuit controlling described motor, the trigger member of the described on-off circuit of exercisable triggering and lock piece, described lock piece has the latched position simultaneously locking guard shield and described trigger member position, and discharge the off-position of described guard shield and described trigger member simultaneously

It is characterized in that: described lock piece also has release guard shield and locks the centre position of described trigger member.

2. portable cutter according to claim 1, it is characterized in that: described lock piece has the first axle perpendicular to described saw blade plane, and exercisable the rotation relative to described first axle of described lock piece is in described latched position, described centre position or described off-position.

3. portable cutter according to claim 2, is characterized in that: when described lock piece is in described latched position or centre position, and the torque produced described lock piece with joint efforts that described lock piece is subject to described trigger member applied pressure is zero.

4. portable cutter according to claim 2, it is characterized in that: when described lock piece is in described centre position, what described lock piece was subject to described trigger member applied pressure makes a concerted effort to create the torque that described lock piece is moved towards described latched position.

5. the portable cutter according to claim 3 or 4, it is characterized in that: described trigger member has second axis parallel with described first axle, and exercisable the rotation relative to described second axis of described trigger member is in the trigger position triggering described on-off circuit, and does not trigger the original position of described on-off circuit.

6. portable cutter according to claim 5, is characterized in that: the distance between described first axle and described second axis is greater than 10mm, and is less than 25mm.

7. portable cutter according to claim 6, is characterized in that: the rotational angle that described lock piece turns to described off-position process from described latched position is greater than 5 degree, and is less than 15 degree.

8. portable cutter according to claim 1, is characterized in that: the exercisable direction along vertical described saw blade plane of described lock piece is moved, and realizes being in described latched position, described centre position or described off-position.

9. portable cutter according to claim 8, it is characterized in that: described lock piece comprises the lock piece connecting portion extended along the direction lengthwise perpendicular to described saw blade plane, and the radial direction along described lock piece connecting portion extends and is respectively used to the first stopper section of trigger member described in backstop and the second stopper section for guard shield described in backstop.