KR20180130936A - Portable Electric Saw - Google Patents

Abstract

The present invention relates to a portable electric saw capable of minimizing a forward and rearward movement of a cutting object, including a skeleton portion having a rectangular frame shape as a whole with an open lower middle portion and including a middle opening portion open on the lower side; a cutting saw guiding unit coupled to the front and rear ends of a cutting saw and guiding the cutting saw for a forward and rearward reciprocating motion on the lower side of the skeleton portion; a power transmission unit applying a predetermined tensile force to the cutting saw coupled to the cutting saw guiding unit and transmitting a force for forward and rearward reciprocating of the cutting saw; a motor unit generating power for forward and rearward reciprocating of the cutting saw; a power conversion unit converting the rotational motion of a rotary shaft of the motor unit into a linear motion and transmitting the linear motion to the cutting saw guiding unit or the power transmission unit through a power connecting member; a main handle portion installed in the upper rear portion of the skeleton portion; an auxiliary handle portion installed on one upper surface of the skeleton portion perpendicularly to the skeleton portion; a front oscillation prevention guide installed so as to be adjustable in front and rear position in the middle opening portion and sliding upward together in accordance with the degree of cutting of the cutting object while supporting the front surface portion of the cutting object; and a rear oscillation prevention guide installed in the rear portion of the middle opening portion and sliding upward together in accordance with the degree of cutting of the cutting object while supporting the rear surface portion of the cutting object. According to the present invention, precision can be sufficiently ensured even without fixing of each cutting object before work. In addition, work time and process reduction can be achieved.

Description

[0001] Portable Electric Saw [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric power saw, and more particularly, to a portable electric power saw having a flow preventing guide so as to minimize movement of a cut object back and forth while a cut object is cut by a cutter.

Generally, a cutting saw is a kind of cutting mechanism used in the process of cutting a workpiece such as wood or a metal material to form a hole or forming a curve, and the cutting saw is long and thin and difficult to work with holding by hand, The cutting operation is performed using the holder.

For example, as shown in FIG. 1, the cut top holder 100 includes a bent portion 110 formed at both ends of the housing at an angle and having a predetermined space therebetween at regular intervals, and a bent portion 110 formed between the bent portions 110 And a knob 130 mounted on a rear end portion of the bent portion 110 and gripped by a hand during the cutting operation.

Therefore, when the object is to be cut by the cutter holder 100, when the knob 130 is reciprocated while holding the knife 130 in a state in which a desired shape of the cutter 120 is engaged in the space between the bent portions 110, The workpiece is cut because the cutting saw 120 repeats forward and backward movement.

However, since the cutting top holder 100 performs only a role of supporting the cutting saw 120, and the series of cutting operations by the cutting top holder 100 is performed only by hand, There is a problem that the work process is increased.

Accordingly, not only is the working process performed by the cutting top holder 100 difficult, but also the precision of the cutting operation by the cutting saw 120 is lowered and the reliability of the cutting operation is lowered.

When the object to be cut is not firmly fixed to the support base or the like, the object moves back and forth due to the resistance between the cutter top 120 and the object in the cutting process by the cutter top 120, There is a problem that the object to be cut is often difficult to fix easily, such as when using a cutting saw for medical purposes.

Korean Patent Publication No. 10-2010-0027603 (Published Date March 11, 2010) Korean Patent Laid-Open Publication No. 10-2012-0001182 (public date January 04, 2012)

Patent Literature 1 proposes a portable saw which can reciprocate the saw blade by a simple method using an endless track belt so that the structure is simple and the cutting performance is excellent as well as it is installed in various devices and can be used interchangeably. The object is moved back and forth in the cutting process, and the accuracy of the work is further lowered.

Patent Document 2 proposes a power saw capable of automating various work processes according to the cutting operation of the cutting saw to improve the convenience of cutting operation as well as to reduce the cutting process and improve precision, A driving mechanism which is reciprocated with respect to the body, and a protection mechanism provided with the article fixing means, and the like.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a portable electric saw having a flow prevention guide and minimizing the movement of the object to be cut back and forth while the object is being cut by the cutting saw, So that sufficient accuracy can be secured without fixing the object to be cut beforehand, and work time and work process can be reduced.

Further, sufficient accuracy can be ensured even when the operator carries out the cutting operation, so that the reliability can be increased.

According to an aspect of the present invention, there is provided a portable electric saw capable of minimizing back and forth movement of an object to be cut, the portable electric saw including a central opening portion having a rectangular frame shape with an open lower part as a whole, Skeleton; A cutting top guide coupled to the front end and the rear end of the cutting saw to guide the cutting saw to reciprocate back and forth from below the framework; A power transmitting portion for applying a predetermined tensile force to the cutting saw joined to the cutting saw guide portion and transmitting a force for reciprocating the cuttingaw back and forth; A motor for generating power to reciprocate the cutting saw forward and backward; A power converting unit that converts the rotational motion of the rotary shaft of the motor unit into a linear motion and transmits the linear motion to the cut saw guide unit or the power transmitting unit through the power connecting member; A main gripping portion provided at an upper rear portion of the skeleton portion; An auxiliary handle disposed on one side of an upper side of the skeleton and perpendicular to the skeleton; A front anti-flow guide bar provided so as to be adjustable in forward and backward positions in the central opening and slidable upward according to a cutting degree of the object to be cut while supporting a front face portion of the object to be cut; And a rearward flow prevention guide bar provided at a rear portion of the central opening portion and slidable upward in accordance with the severance of the object to be cut while supporting a rear portion of the object to be cut.

Here, the skeleton portion may include: an upper frame extending upward and backward; A front frame extending vertically at a front end thereof; A rear frame extending vertically at a rear end thereof; A front side plate coupled to a front portion of the upper frame and a side surface of the front frame; And a rear side plate coupled to a rear portion of the upper frame and a side surface of the rear frame, wherein a lower end portion of the front side plate is provided with a front lower end blocking portion formed to bend inward, and a lower end portion of the rear side plate The main grip portion is provided on the upper rear portion of the rear frame and the auxiliary grip portion is provided on one side of the upper frame perpendicularly to the skeleton portion.

Here, the first vertical guide bar is installed and fixed to the inside of the front side plate; A second vertical guide rod fixedly installed inside the rear side plate; A first horizontal guide rod installed and fixed between an upper end of the first vertical guide bar and an upper end of the second vertical guide bar; The upper end portion is slidably coupled to the first horizontal guide rod so as to be movable forward and rearward and the lower end portion is connected to the front and rear position adjusting vertical member ; A first moving member slidably coupled to the first vertical guide bar and a second moving member slidably coupled to the second vertical guide bar, the second moving member being installed to be spaced apart from the front and rear position adjusting vertical members A second horizontal guide rod; And a third moving member slidably coupled to the second horizontal guide bar and having front and rear position fixing members, wherein an upper end of the forward flow prevention guide is coupled and fixed to the third moving member, The frontward flow prevention guide bar is slidably engaged with the front and rear position adjusting vertical member so that the rearward flow prevention guide bar can be moved, and the upper end of the rearward flow prevention guide bar is coupled and fixed to the second moving member.

Here, each of the forward flow prevention guide bar and the rear flow prevention guide bar is provided with a through-hole slit formed in the front-rear direction so that the cutting saw can reciprocate without hitching.

Here, the cutting top guide portion may include: a cutting top front end joining member to which a front end portion of the cutting saw is engaged; A front linear bearing fixedly installed inside the front side plate;

A cutting top rear end engaging member to which a rear end of the cutting top is engaged and fixed; And a rear linear bearing mounted and fixed to the inside of the rear side plate, wherein the cutting top front end engaging member is coupled to the front linear bearing so as to be movable back and forth, and the cutting end rear end engaging member is connected to the rear linear bearing To the front and rear of the vehicle.

Here, the power transmitting portion may include: a first pulley rotatably installed inside the upper front corner portion of the front side plate; A second pulley rotatably installed inside the lower front corner portion of the front side plate; A third pulley rotatably installed inside the upper rear corner of the rear side plate; A fourth pulley rotatably installed inside the lower rear corner of the rear side plate; Wherein the first pulley, the second pulley, the second pulley, the third pulley, and the fourth pulley are disposed to be engaged with the first pulley, the second pulley, the third pulley, and the fourth pulley, The power transmitting member And a tension adjuster coupled to a portion of the power transmitting member to adjust tension applied to the power transmitting member.

Here, the tension adjusting unit includes: a first coupling member coupled to the power transmitting member via a first row fixing joint; A second coupling member coupled to the power transmitting member via a second row fixed joint; And a pair of tension adjusting bolts threaded through the first engaging member and screwed to the second engaging member.

The tension adjusting unit may further include a spring coupled to a portion of the power transmitting member so as to minimize occurrence of a resonance phenomenon.

Here, the power conversion unit is installed and fixed inside the lower rear corner of the rear side plate, and the motor connection unit is disposed at one side of the power conversion unit and the other side is disposed inside the rear side plate and reciprocates And an end of the power connecting member is coupled to the cutting-back rear end engaging member.

Here, the main grip portion may include a battery portion installed inside the main grip portion and supplying power to the motor portion; And a main switch for controlling operation of the motor unit.

Here, the auxiliary handle part may be foldably installed on one side of the upper side of the skeleton part.

According to the portable electric saw of the present invention, sufficient accuracy can be secured without fixing the object to be cut before work, and the effect of reducing the working time and the work process is obtained.

Further, even when the operator carries out the cutting operation, sufficient accuracy can be ensured and the reliability is increased.

1 is a schematic view showing a conventional cutting top holder,
2 is a side view of a portable electric power saw according to an embodiment of the present invention;
3 is a side view of the portable electric saw showing a state in which the forward flow prevention guide is moved forward;
Fig. 4 is a side view of the portable electric power saw showing a state in which the forward flow prevention guide bar and the rearward flow prevention guide bar are moved downward in the state of Fig. 3;
FIG. 5 is a bottom perspective view of the portable electric saw shown in the state of FIG. 3 viewed from below,
6 is an exploded perspective view showing a part of the configuration of the tension adjusting portion;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the present invention is not limited to the embodiments.

Hereinafter, a configuration of a portable electric power saw according to the present invention will be described.

FIG. 2 is a side view of the portable electric power saw according to an embodiment of the present invention, FIG. 3 is a side view of the portable electric power saw showing a state in which the forward flow prevention guide is moved forward, FIG. Fig. 5 is a bottom perspective view of the portable electric power saw shown in the state of Fig. 3 as viewed from the lower side, and Fig. 5 is a bottom perspective view of the portable electric power saw shown in Fig. 6 is an exploded perspective view showing a part of the configuration of the tension adjusting portion.

Referring to the portable electric power tool 1 shown in Fig. 2, the left direction of the figure is the front direction, the right direction of the figure is the rear direction, the direction leading to the front part of the figure is the left direction, The outgoing direction is the right direction. Hereinafter, the description will be made using the direction based on the portable electric power tool 1 as a reference.

A portable electric power saw 1 according to the present invention includes a skeleton 10, a cutting top guide portion, a power transmission portion, a motor portion 40, a power conversion portion 50, a main grip portion 60, an auxiliary grip portion 70, a forward flow prevention guide base 80, and a rear flow prevention guide base 90.

The skeleton part 10 is a part forming the overall appearance and skeleton of the portable electric power saw 1 according to the present invention and has a rectangular frame shape with the lower central part being opened as a whole and has a central opening part 11, A front frame 13, a rear frame 14, a front side plate 15, a front lower end blocking portion 16, a rear side plate 17 and a rear lower end blocking portion 18.

The upper frame 12 is a member extending in the front-rear direction on the upper side of the framework 10, and may have a structure in which a left plate member and a right plate member extended in the front-rear direction are coupled through a plurality of engaging members However, in order to improve the structural strength, it is preferable to use a member having a square pipe shape.

A front frame 13 extending in the vertical direction is provided below the front end of the upper frame 12, and the front frame 13 may have various structures, but a rectangular pipe-shaped member is preferably used.

A front side plate 15 is coupled and fixed to one side of the front portion of the upper frame 12 and the front frame 13 and a front lower end blocking portion 16 bent inward at a lower end portion of the front side plate 15, .

A rear frame 14 extending vertically is provided under the rear end of the upper frame 12, and the rear frame 14 may have a variety of structures, but a rectangular pipe-shaped member is preferably used.

A rear side plate 17 is coupled and fixed to one side of the rear portion of the upper frame 12 and the rear frame 14 and a rear lower end blocking portion 18 bent inward at a lower end of the rear side plate 17. [ .

A central opening 11 opened downward is formed between the front side plate 15 and the rear side plate 17 and a cutting saw 3 is provided so as to cross the lower side of the central opening 11, And the object to be cut is moved into the central opening portion 11 while being cut by the cutting teeth on the lower side of the cutting saw 3.

The cutting saw guide portion is a portion engaged with the front end portion and the rear end portion of the cutting saw 3 and serving to guide the cutting saw 3 to reciprocate forward and backward from the lower side of the skeleton portion 10, A front linear bearing 22, a cutting saw rear end engagement member 23, and a rear linear bearing 24. [

The cutting saw front end engaging member 21 is engaged with the front linear bearing 22 fixed to the inside of the front side plate 15 as a member to be engaged with the front end portion of the cutting saw 3, The end joint member 23 is coupled to the rear linear bearing 24 that is fixed to the inside of the rear side plate 17 as a member that is engaged with the rear end of the cutting saw 3.

The power transmitting portion is a portion that applies a predetermined tensile force to the cutting saw 3 coupled to the cutting saw guide portion and transmits a force for reciprocating the cutting saw 3, and includes a first pulley 31, A second pulley 32, a third pulley 33, a fourth pulley 34, a power transmitting member 35, and a tension adjusting portion 36. [

The first pulley 31 is rotatably installed inside the upper front corner portion of the front side plate 15 and the second pulley 32 is rotatably installed inside the lower front corner portion of the front side plate 15, The third pulley 33 is rotatably disposed inside the upper rear corner portion of the rear side plate 17 and the fourth pulley 34 is rotatably installed inside the lower rear corner portion of the rear side plate 17. [

On the other hand, the power transmitting member 35 has a sufficient strength as a linear member which is moved in the direction changing by being caught by the first pulley 31, the second pulley 32, the third pulley 33 and the fourth pulley 34 Wire or chain may be used.

One end of the power transmitting member 35 is engaged with the cutting tip front end engaging member 21 and the other end is engaged with the cutting end rear end engaging member 23 and a portion therebetween is connected to the first pulley 31, The second pulley 32, the third pulley 33, and the fourth pulley 34, respectively.

On the other hand, when a chain is used as the power transmitting member 35, a suitable sprocket is used instead of each of the first pulley 31, the second pulley 32, the third pulley 33 and the fourth pulley 34 Lt; / RTI >

The tension adjusting portion 36 is a portion that is attached to a part of the power transmitting member 35 so as to adjust the tension applied to the power transmitting member 35 and includes a first engaging member 37a, a second engaging member 37b, And a tension adjusting bolt 38.

The first engagement member 37a is a member that is fixedly coupled to the power transmitting member 35 via the first line fixing joint 361a and the second engagement member 37b is a member that is fixed to the power transmission member 35 via the second line fixing joint 361b And the pair of tension adjusting bolts 38 are members that are threaded through the first engaging member 37a and screwed to the second engaging member 37b.

6, a first joint installation hole 362a through which a first row fixing joint 361a is inserted is formed at the center of the first joint member 37a, and a tension adjusting bolt 38 is provided on both sides of the first joint mounting hole 362a. And a first screw coupling hole 364a is formed at the center of the upper surface of the bolt through hole 363a.

The first joint fixing screw 361a is inserted into the first joint mounting hole 362a and the first joint fixing screw 365a is inserted into the first joint mounting hole 362a, It is possible to fix the first row fixing joint 361a by fastening it to the coupling hole 364a.

A second joint installation hole 362b is formed in the center of the second joint member 37b to receive the second row fixing joint 361b and a pair of tension adjusting bolts 38 are screwed on both sides of the second joint mounting hole 362b. And a second screw coupling hole 364b is formed at the center of the upper surface.

The second joint fixing screw 365b is inserted into the second joint mounting hole 362b and the second joint fixing screw 365b is inserted into the second joint mounting hole 362b after the second row fixing joint 361b, It is possible to fix the second row fixing joint 361b by fastening it to the coupling hole 364b.

Then, a pair of tension adjusting bolts 38 are passed through the bolt through holes 363a of the first engaging member 37a and screwed to the bolt engaging holes 363b of the second engaging member 37b It is possible to adjust the initial tension applied to the power transmitting member 35 by tightening or loosening.

At this time, one or more locknuts may additionally be coupled to each of the pair of tension adjusting bolts 38. Therefore, after the initial tension is adjusted, the lock nut is rotated or fixed so as to apply the pressing force in the direction of the second engaging member 37b, or the lock nut is rotated and fixed so as to be pressed against each other, It is possible to prevent the tension adjusting bolt 38 from being loosened from the bolt fitting hole 363b of the second engaging member 37b.

The tension adjusting unit 36 may further include a spring 39 coupled to a portion of the power transmitting member 35 so as to minimize the occurrence of a resonance phenomenon.

In the present invention, when the wire is used as the power transmitting member 35, the spring 39 may not be used, but it is preferable that the spring 39 is used when the chain is used as the power transmitting member 35.

When the spring 39 is used, it is preferable to select and use the spring 39 having a modulus of elasticity (k) capable of quickly stabilizing the change in the tension applied to the power transmitting member 35.

For this purpose, after measuring the damping coefficient (c = f _c / v), which is the ratio of the resistance to the moving speed of the power transmitting member 35 in the state where the power transmitting member 35 is installed, (K) to obtain a critical attenuation returning to the normal state, and uses the spring 39 having the calculated elastic modulus k.

The equation of motion of the damping system is as follows.

를 만족하여야 하는바,

인 탄성계수를 갖는 스프링(39)을 선택하여 사용하면 된다.To obtain the critical attenuation

Respectively,

A spring 39 having a modulus of elasticity may be selected and used.

Here, m is a total mass of the motion members except for the spring 39, and is the sum of masses of the cutting saw 3, the cutting top front end joining member 21, the cutting top rear end joining member 23, the power transmitting member 35, The weight of the first engaging member 37a, the second engaging member 37b, and the pair of tension adjusting bolts 38 is included.

The motor unit 40 is preferably a BLDC motor with low noise, high efficiency, and long lifetime, which functions as a component that generates power for reciprocating the cutting saw 3 back and forth.

The power converting unit 50 is a component that converts the rotational motion of the rotating shaft of the motor unit 40 into a linear motion and transmits the rotational motion to the cutting top guide unit or the power transmitting unit. Various known configurations can be employed, and are configured to include a power connection member 51. [

The power conversion unit 50 is installed and fixed inside the lower rear corner of the rear side plate 17. The motor unit 40 is provided on one side of the power conversion unit 50 and the power connection member 51 is provided on the other side. Is disposed inside the rear side plate 17. [

Then, the end of the power connecting member 51 is coupled to the cutting-tip rear end engaging member 23 to reciprocate back and forth.

The main grip portion 60 has a battery portion 65 and a main switch 67 as a portion where the user can grip the grip portion 60 with one hand and adjust the operation of the motor portion 40. [

The battery unit 65 is a component that is installed inside the main grip unit 60 and supplies power to the motor unit 40. It is preferable that a lithium ion battery or a lithium polymer battery is used.

The main grip portion 60 is provided on the upper rear portion of the skeleton portion 10, and preferably on the upper rear portion of the rear frame 14.

The auxiliary handle portion 70 is a portion that the user can grasp with the other hand and can support the portable electric power saw 1 and is installed horizontally perpendicularly to the skeleton portion 10 on the upper side of the skeleton portion 10 , Preferably horizontally on one side of the upper frame 12, and may be foldably installed on one side of the upper side of the framework 10.

The forward flow prevention guide 80 is a member that is adjustably adjustable in the front and rear positions within the central opening 11 and slides upward together with the degree of severance of the object to be cut while supporting the front face of the object to be cut, The prevention guide 90 is a member which is provided on the rear portion of the central opening portion 11 and slides upward together with the severance of the object to be cut while supporting the rear portion of the object to be cut.

Hereinafter, a configuration for adjusting the forward and backward positions of the forward flow prevention guide 80 and then sliding upward and downward together with the rearward flow prevention guide 90 will be described.

The first vertical guide bar 81 and the second vertical guide bar 83 are components for guiding the up and down movement of the forward flow prevention guide 80 and the backward flow prevention guide 90, The rod 81 is fixed vertically to the inside of the front side plate 15 and the second vertical guide rod 83 is fixed to the inside of the rear side plate 17. [

The first moving member 82 is slidably coupled to the first vertical guide bar 81 so that the second moving member 84 is slidably coupled to the second vertical guide rod 83 And,

The second moving member 84 is provided with a vertical position fixing member such as a wing bolt which can fix the second moving member 84 to the second vertical guide bar 83.

A first horizontal guide bar 85 is installed between the upper end of the first vertical guide bar 81 and the upper end of the second vertical guide bar 83. That is, the front end of the first horizontal guide rod 85 is fixed to the inside of the front side plate 15 and the rear end is fixed to the inside of the rear side plate 17.

The front and rear position adjusting vertical member 86 has a function of guiding the forward movement position of the forward flow prevention guide 80 to be fixed and the forward flow prevention guide 80 to be slid up and down along the front and rear position adjustment vertical member 86 The upper end of the screw rod 7 is slidably engaged with the first horizontal guide rod 85 and can be moved forward and backward. The lower end of the screw rod 7 is rotatably supported at one end thereof .

The screw rod 7 is a component that is installed to penetrate through the support member 5 fixed to the inside of the front side plate 15. One end of the screw rod 7 is rotatably engaged with the lower end of the front- And the other side is protruded forward of the skeleton 10 through the through hole of the front frame 13 and the knob 200 for manually rotating the screw rod 7 is provided at the other end.

Therefore, by rotating the knob 200 at the other end of the screw rod 7 in a state in which the front and rear positions of the upper end of the front and rear position adjusting vertical member 86 are fixed, a rearward pushing force is applied to the lower end of the front and rear position adjusting vertical member 86 .

It is also possible to adjust the screwing force with the screw rod 7 by tightening or loosening the wing bolt or the like of the screw rod fixing member 9 provided inside the front side plate 15 and it is difficult to rotate the screw rod 7 As shown in FIG.

A second horizontal guide rod 87 is provided between the first moving member 82 and the second moving member 84 so as to be spaced apart from the first horizontal guide rod 85. In the second horizontal guide rod 87, 3 movable member 88 is slidably coupled to the front side and the rear side of the third moving member 88 so that the third moving member 88 can be fixed to the second horizontal guide rod 87, A fixing member is provided.

The upper end of the forward flow prevention guide bar 80 is engaged with the third moving member 88 and the forward flow prevention guide bar 80 is slidably coupled to the front and rear position adjustment vertical member 86 up and down The upper portion of the rearward flow prevention guide bar 90 is engaged with the second moving member 84 and can be slid up and down together with the second moving member 84. [

The upper end of the forward flow prevention guide bar 80 is coupled to the third moving member 88 so as to be slidable upward and downward, The third moving member 88 is fixed so as not to be movable back and forth using the front and rear position fixing members and the knob 200 is rotated after joining the wing bolt etc. of the screw rod fixing member 9, The frontward flow prevention guide bar 80 and the front and rear position adjusting vertical member 86 can not be moved forward or backward when a rearward pushing force is applied to the lower end portion of the position adjusting vertical member 86. [

However, the forward flow prevention guide bar 80 is vertically slidably coupled to the front-rear position adjustment vertical member 86, and the second horizontal guide bar 87, the third moving member 88, The guide bar 80 can be slid up and down together with the first moving member 82 and the second moving member 84 and the rearward flow preventing guide bar 90 can be slid up and down together with the second moving member 84 So that the forward flow prevention guide base 80 and the rear flow prevention guide base 90 can be slid up and down together.

On the other hand, in order to allow the cutting saw 3 to reciprocate without being hung at the time of vertically moving the forward flow prevention guide bar 80 and the rear flow prevention guide bar 90, Each of the bases 90 is provided with through-slits 89 and 99 formed in the front-rear direction (see FIG. 5).

Hereinafter, a process of cutting the object to be cut using the portable electric power tool 1 according to the present invention will be described.

At first, the portable electric power tool 1 is prepared as shown in Fig.

The front and rear position fixing members of the third moving member 88 are unfastened and the screw bolt and the like of the screw rod fixing member 9 are unfastened and then the front and rear position adjusting vertical member 86, the third moving member 88, The prevention guide 80 is moved forward to be spaced apart from the rearward flow prevention guide base 90 by a distance necessary for cutting the object to be cut (see FIG. 3).

Thereafter, the upper and lower position fixing members of the second movable member 84 are disengaged and then the first movable member 82, the second movable member 84, the second horizontal guide rod 87, the third movable member 88 ), The forward flow prevention guide 80 and the rearward flow prevention guide 90 are moved down together (see FIG. 4).

Then, after the object to be cut is positioned between the forward flow prevention guide 80 and the rearward flow prevention guide 90, the front and rear position adjusting vertical member 86, the third moving member 88, The guide 80 is moved backward so that the forward flow prevention guide 80 contacts the front face of the object to be cut and the rear flow prevention guide 90 touches the rear face of the object to be cut.

In this state, the front and rear position fixing members of the third moving member 88 are locked so that the front and rear position adjusting vertical member 86, the third moving member 88 and the forward flow preventing guide 80 can be moved back and forth The knob 200 is rotated to apply a rearward pushing force to the lower end portion of the front and rear position adjusting vertical member 86. In this case,

Thereafter, the portable electric power tool 1 is operated to cut the object to be cut, and the forward flow prevention guide band 80 and the rear flow prevention guide band 90 are slid upward together according to the degree of severance of the object to be cut , It is possible to minimize the movement of the object to be cut back and forth while the object to be cut is cut.

INDUSTRIAL APPLICABILITY In the portable electric power saw according to the present invention, sufficient accuracy can be secured without fixing the objects to be cut before work, and the work time and work process can be advantageously reduced.

Further, even when the operator carries out the cutting operation, sufficient accuracy can be ensured and reliability is increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, such modifications or changes should be construed as being included within the scope of the present invention.

1: Portable chainsaw
3: Cutting saw 5: Support member
7: screw rod 9: screw rod fixing member
10: skeleton part
11: central opening part 12: upper frame
13: front frame 14: rear frame
15: front side plate 16: front lower end blocking portion
17: rear side plate 18: rear lower end blocking portion
21: cutting saw front end engaging member 22: forward linear bearing
23: cutting edge rear end engaging member 24: rear linear bearing
31: first pulley 32: second pulley
33: third pulley 34: fourth pulley
35: Power transmission member
36:
361a: first row fixing joint 361b: second row fixing joint
362a: First joint installation hole 362b: Second joint installation hole
363a: Bolt through hole 363b: Bolt coupling hole
364a: first screw coupling hole 364b: second screw coupling hole
365a: first joint fixing screw 365b: second joint fixing screw
37a: first engagement member 37b: second engagement member
38: tension adjusting bolt 39: spring
40:
50: power converting section 51: power connecting member
60: Main handle portion
65: Battery section 67: Main switch
70: auxiliary handle portion
80: forward flow prevention guide base 81: first vertical guide rod
82: first moving member 83: second vertical guide rod
84: second moving member 85: first horizontal guide rod
86: longitudinal position adjustment vertical member 87: second horizontal guide rod
88: third moving member 89: through slit
90: backward flow prevention guide pedestal 99: through slit
200: Knob

Claims (11)

A portable electric saw capable of minimizing back and forth movement of an object to be cut,
A skeleton portion having a rectangular opening shape with a lower central portion as a whole and including a central opening portion opened at a lower side;
A cutting top guide coupled to the front end and the rear end of the cutting saw to guide the cutting saw to reciprocate back and forth from below the framework;
A power transmitting portion for applying a predetermined tensile force to the cutting saw joined to the cutting saw guide portion and transmitting a force for reciprocating the cuttingaw back and forth;
A motor for generating power to reciprocate the cutting saw forward and backward;
A power converting unit that converts the rotational motion of the rotary shaft of the motor unit into a linear motion and transmits the linear motion to the cut saw guide unit or the power transmitting unit through the power connecting member;
A main gripping portion provided at an upper rear portion of the skeleton portion;
An auxiliary handle disposed on one side of an upper side of the skeleton and perpendicular to the skeleton;
A front anti-flow guide bar provided so as to be adjustable in forward and backward positions in the central opening and slidable upward according to a cutting degree of the object to be cut while supporting a front face portion of the object to be cut; And
And a rearward flow preventing guide provided at a rear portion of the central opening portion and slidable upward in accordance with a degree of severance of the object to be cut while supporting a rear portion of the object to be cut.
The method according to claim 1,
The skeleton portion,
An upper frame extending on the upper side in the front-rear direction;
A front frame extending vertically at a front end thereof;
A rear frame extending vertically at a rear end thereof;
A front side plate coupled to a front portion of the upper frame and a side surface of the front frame; And
And a rear side plate coupled to a rear portion of the upper frame and a side surface of the rear frame,
A front lower end blocking portion formed to bend inward is provided at a lower end portion of the front side plate,
And a rear lower end blocking portion formed to be bent inward is provided at a lower end portion of the rear side plate,
Wherein the main grip portion is provided on an upper rear portion of the rear frame,
Wherein the auxiliary handle is installed on one side of the upper frame so as to be perpendicular to the skeleton.
3. The method of claim 2,
A first vertical guide rod fixedly installed inside the front side plate;
A second vertical guide rod fixedly installed inside the rear side plate;
A first horizontal guide rod installed and fixed between an upper end of the first vertical guide bar and an upper end of the second vertical guide bar;
And an upper end portion of the screw rod is slidably coupled to the first horizontal guide rod so as to be movable forward and rearward, and an end portion of the screw rod, which is screwed to a support member installed and fixed to the inside of the front side plate, A vertical member;
A first moving member slidably coupled to the first vertical guide bar and a second moving member slidably coupled to the second vertical guide bar, the second moving member being installed to be spaced apart from the front and rear position adjusting vertical members A second horizontal guide rod; And
And a third moving member slidably coupled to the second horizontal guide rod and having front and rear position fixing members,
An upper end portion of the forward flow prevention guide band is coupled and fixed to the third shifting member,
The forward flow prevention guide is slidably coupled to the front and rear position adjusting vertical member so as to be movable up and down,
And an upper end of the rearward flow prevention guide band is engaged and fixed to the second moving member.
The method of claim 3,
Wherein each of the forward flow prevention guide bar and the rear flow prevention guide bar is provided with a through slit formed in the forward and backward direction so that the cutting saw can reciprocate without hitching.
5. The method of claim 4,
The cutting top guide portion
A cutting saw front end engaging member to which the front end of the cutting saw is engaged and fixed;
A front linear bearing fixedly installed inside the front side plate;
A cutting top rear end engaging member to which a rear end of the cutting top is engaged and fixed; And
And a rear linear bearing installed and fixed inside the rear side plate,
Wherein the cutting top front end engaging member is coupled to the front linear bearing so as to be movable back and forth,
And the cutting top rear end engagement member is coupled to the rear linear bearing in a back and forth moveable manner.
6. The method of claim 5,
The power transmission unit includes:
A first pulley rotatably installed inside the upper front corner portion of the front side plate;
A second pulley rotatably installed inside the lower front corner portion of the front side plate;
A third pulley rotatably installed inside the upper rear corner of the rear side plate;
A fourth pulley rotatably installed inside the lower rear corner of the rear side plate;
Wherein the first pulley, the second pulley, the second pulley, the third pulley, and the fourth pulley are disposed to be engaged with the first pulley, the second pulley, the third pulley, and the fourth pulley, The power transmitting member And
And a tension adjuster coupled to a portion of the power transmitting member to adjust tension applied to the power transmitting member.
The method according to claim 6,
The tension adjusting unit may include:
A first coupling member coupled to the power transmitting member via a first row fixed joint;
A second coupling member coupled to the power transmitting member via a second row fixed joint; And
And a pair of tension adjusting bolts penetrating through the first engaging member and screwed to the second engaging member.
8. The method of claim 7,
The tension adjusting unit may include:
Further comprising: a spring coupled to a portion of the power transmitting member so as to minimize the occurrence of a resonance phenomenon.
9. The method of claim 8,
Wherein the power conversion portion is fixed to the inside of the lower rear corner portion of the rear side plate,
The power conversion unit includes the motor unit on one side and the power connection member on the other side disposed inside the rear side plate and reciprocating,
And an end of the power connection member is coupled to the cutting-back rear end engagement member.
10. The method according to any one of claims 1 to 9,
The main gripping portion
A battery unit installed inside the main grip unit and supplying power to the motor unit; And
And a main switch for controlling operation of the motor unit.
10. The method according to any one of claims 1 to 9,
The auxiliary handle portion
And a foldable portion provided on an upper side of the skeleton.

Images