KR101006002B1 - Power tool - Google Patents

Abstract

PURPOSE: An electric tool capable of reducing the fatigue of an operator by reducing vibration, is provided to reduce vibration using the first and second vibration reducing member in crushing or boring operation. CONSTITUTION: An electric tool capable of reducing the fatigue of an operator by reducing vibration comprises a first vibration reducing unit(100) and a second vibration reducing unit. The first vibration reducing unit comprises a guide pin(120), an elastic member(130) and a counter weight(140). The elastic member is elastically supported with the outer circumference of the guide pin. The elastic member is expanded and contracted relative to the vibration direction. The elastic member is inserted to both side of the counter weight. The counter weight contracts the elastic member according to the guide pin and reduces vibration.

Description

Power Tool

The present invention relates to a power tool such as a hammer drill, and more particularly, to effectively reduce both the strong intensity vibration and the weak intensity vibration generated when using the power tool.

In general, among a variety of power tools, the hammer drill is a tool for converting the rotational force of the motor into the reciprocating motion of the piston, the rotation of the bit and the striking force to break or drill concrete or rock, and the air pressure generated by the piston generates the striking force. And rotates the bit through the gear power train.

This hammer drill is largely composed of a main body and a handle portion including a motor housing, a crank housing and a tool holder portion.

Moreover, the motor housing of the main body houses a motor that generates rotational force by electrical energy. The crank housing is provided with a motion conversion mechanism for converting the rotational motion of the motor into a reciprocating motion and a blow mechanism portion for generating a blow force by generating air pressure. On the front of the striking mechanism section is a tool holder section for mounting and detaching work tools.

The handle portion is composed of a handle that accommodates the tool by the operator, and a handle coupling portion that connects the handle with the main body. In addition, the handle is provided with a switch for turning on / off the hammer drill.

When the switch provided in the handle is pulled, electric energy is applied to the electric motor, and the motor housed in the motor housing generates a rotational force. The motor rotational force thus generated is transmitted to the motion conversion mechanism of the crank housing. The motion converting mechanism housed in the crank housing converts the rotational force of the motor into linear reciprocating motion to generate a linear reciprocating motion of the piston stored in the striking mechanism part.

The striking mechanism portion is provided with a cylinder extending in a direction orthogonal to the axis of rotation of the motor. The piston is slidable in the cylinder. The piston reciprocates along the inner circumference of the cylinder by the motion converting mechanism. At the front of the piston, the striking member is slidably provided along the inner circumference of the cylinder. An air chamber is formed between the piston and the striker in the cylinder. By the linear reciprocating motion of the piston, the air pressure in the air chamber is repeatedly raised and lowered to impart a striking force to the striking person.

The tool holder part is located in front of the hitter, and anvil is seated inside the tool holder part. The anvil slidably operates the inner circumferential surface of the tool holder portion. The tool holder part is coaxial with the cylinder, and the striking force moves forward and impinges on the rear end of the anvil, and the striking force is transmitted to the anvil. The tool holder is mounted on the front of the anvil by the tool holder, and the striking force applied to the anvil impinges the rear end of the working tool so that the striking force is applied to the working tool. The workpiece is crushed by the striking force applied to the work tool.

As a result of the above operation process, the piston, the hitter, the anvil and the work tool are vibrated by reciprocating motion and mutual collision, and the generated vibration is transmitted to the worker through the handle part, which makes it difficult to proceed smoothly, as well as fatigue during work. There is a problem that is further weighted.

In order to solve the problem of such a general electric hammer drill, a power tool having a vibration reduction mechanism has been conventionally proposed. For example, US Pat. No. 7,252,157 (hereinafter referred to as "Patent Document 1") includes a vibration reduction mechanism part in the crank housing.

The vibration reduction mechanism part in the said patent document 1 is provided in the side surface of an impact mechanism part, and is communicated with an impact mechanism part by an air passage. The space formed by the striking mechanism portion and the vibration reduction mechanism portion is formed as a closed space. The vibration reduction mechanism part is provided with a counterweight and two coil compression springs. The counterweight is capable of reciprocating motion parallel to the reciprocating motion of the piston. Two springs are located at each end of the counterweight.

The space formed by the striking mechanism portion and the vibration reduction mechanism portion is a closed space. When the piston moves forward during the operation of the power tool, the counter weight moves backward. Conversely, when the piston moves backwards, the counterweight moves forwards. Thus, the piston is configured to reciprocate in conjunction with the reciprocating motion.

However, the vibration reduction mechanism portion has a disadvantage in that the vibration damping effect is reduced according to the strength of the vibration transmitted to the main body. In other words, since the magnitude of the spring force provided at both ends of the counterweight is fixed to match the vibration of the strong intensity, the vibration of the weak strength cannot be effectively reduced and reduced. In addition, the counterweight does not operate smoothly by friction between the counterweight and the vibration reduction mechanism part housing, and there is a problem in that the vibration reduction mechanism part is expensive.

Another example with a vibration reduction mechanism involves a main body and a handle engaging part vibration isolator as disclosed in US Patent Publication No. 2006/0219418 (hereinafter referred to as "Patent Document 2").

The handle coupling part vibration isolator in the said patent document 2 connects a hammer drill main body and a handle part, and is located in the same or slightly upper part of the axis | shaft of a hitting mechanism part. In addition, it may slide in the same direction as the movement direction of the body in which vibration occurs.

The vibration isolator involves a rubber buffer or coil spring as an elastic element and utilizes friction between the handle rod and the guide as a damping element. The vibration transmitted from the main body of the hammer drill to the handle is configured to attenuate the vibration with the elastic element and the damping element accompanying the vibration isolator.

However, the vibration isolator is not decoupling completely by friction of the hammer drill body and the handle portion, there is a problem that can not effectively block the vibration transmitted from the body. In addition, when using the coil compression spring alone and the rubber buffer alone as the elastic element, due to the physical properties of each element, there is no smooth vibration attenuation.

Although the hammer drill having the vibration reducing mechanism disclosed in the prior art works effectively against the vibration of the strong intensity, it is not effective against the vibration of the weak intensity, there is a problem that does not completely eliminate the fatigue of the operator due to the vibration.

Accordingly, the present invention is to solve the above-mentioned conventional problems, the problem to be solved by the present invention is to reduce the vibration of the strong intensity and weak intensity to reduce the vibration generated during use effectively. .

As a means for solving the above problems,
Electric movement with primary vibration reduction means and secondary vibration reduction means in the main body and the handle part to reduce the vibration generated during the crushing or drilling work while the blow operation and the rotation operation are simultaneously performed or the blow operation is performed. As a tool,
The primary vibration reducing means is provided on at least one side of the main body,
A guide pin, an elastic member that is supported on the outer circumferential surface of the guide pin and stretched in accordance with the vibration direction, and the elastic member is inserted and supported at both sides, and the guide pin is penetrated while the elastic member contracts the elastic member along the guide pin. It comprises a counter weight moving to reduce, and a case for receiving the elastic member and the counterweight while supporting the guide pin,
The secondary vibration reducing means is provided inside the upper side in contact with the main body and the handle part, and extends and is formed inside the handle part to allow the main body and the handle part to be slidably moved in accordance with the vibration so that the main body and the handle part are coupled. The sleeve is coupled to the gap in the slide hole of the insertion tube, and the vibration isolator mechanism consisting of a shock absorbing member for absorbing the vibration between the main body and the inside of the handle portion, and an elastic member carried in the buffer member. It is included.
In addition, the both ends of the guide pin is a structure that prevents the flow of the guide pin, and a ring that acts as a buffer in the event of a collision with a large amplitude of the counterweight due to the movement of the counterweight.
In addition, the inside of the handle portion is provided with a holder at intervals from the side in the main body so that the dustproof mechanism portion is supported.
In addition, the vibration isolator is a structure that further includes a support plate for supporting both ends of the elastic member.
In addition, while being further provided on the lower side coupled to the main body and the handle portion, the lower surface and the lower surface of the handle portion is a structure further comprising a secondary vibration reducing means coupled with a gap to block the vibration.
In addition, the secondary vibration reducing means provided on the lower side of the main body and the handle portion, the structure comprising a shock-absorbing coupling portion is composed of a buffer member fitted in the lower surface of the handle portion, and a fastening member coupled through the buffer member. to be.
In addition, the buffer member is a structure that is coupled to contact the lower surface of the body through the lower surface of the handle portion.
In addition, the structure between the buffer member and the fastening member further includes a tube for maintaining the fastening force with the fastening member.

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Thus, the present invention is provided with primary vibration reducing means on both sides of the main body of the power tool to reduce the vibration generated when working with the power tool, it is possible to reduce the vibration of strong intensity, primary vibration reduction By providing secondary vibration reducing means in the upper and lower positions of the means to reduce the vibration of the weak intensity, it is possible to significantly reduce the fatigue caused by the vibration transmitted to the operator, thereby improving the work efficiency have.

1 is a cross-sectional view showing the overall structure of a hammer drill according to an embodiment of the present invention.
2 is a plan view of the present invention.
3 is an enlarged cross-sectional view of portion A of FIG. 2.
Figure 4 is a perspective view showing the primary vibration reducing means of Figure 3 separately.
5 is a partially cutaway perspective view of the primary vibration reducing means of FIG.
FIG. 6 is an enlarged cross-sectional view of part B of FIG. 1, and is an enlarged cross-sectional view showing the structure of the secondary vibration reducing means provided in the hammer drill according to the present invention.
7 is a perspective view illustrating the dustproof mechanism part of FIG. 4.
8 is a plan sectional view of a portion C of FIG.

DETAILED DESCRIPTION Hereinafter, specific details for carrying out the present invention will be described in detail with reference to the accompanying drawings.

In one embodiment of the present invention, the power tool will be described with respect to the hammer drill (1).

1 is a partial cross-sectional view showing the overall structure of a hammer drill according to an embodiment of the present invention. 2 is a partial cutaway plan view of a hammer drill according to an embodiment of the present invention.

As shown in the figure, the hammer drill 1 according to an embodiment of the present invention is a drive means 20 provided in the interior of the main body 10, and a power for transmitting power by the drive means 20 It consists of a transmission means 30, and a striking portion 40 and a rotating portion 50 which perform the striking and rotating operation by the power transmission means 30.

The driving means 20 is composed of a motor 21 that is driven when electricity is applied, the power transmission means 30 is coupled to the shaft 22 of the motor 21 to transfer the power generated from the motor 21. The first and second gears 31 and 32 which are rotated by receiving, the crankshaft 33 which is coupled to the center of the first gear 31 and rotated, and the end 33a of the crankshaft 33; A connecting rod 34 which is eccentrically coupled to convert the rotational force of the crankshaft 33 into a linear motion, a transmission gear 35 that is coupled to the center of the second gear 32 to transmit the rotational force, and the transmission Coupled with the upper end of the gear 35 is a structure consisting of a bevel gear 36 is rotated by receiving power.

In addition, the striking portion 40 has a cylinder 41 to which the bevel gear 36 is coupled to an outer circumference thereof, and is provided inside the cylinder 41 to perform the linear movement while the connecting rod 34 and the shaft 34a. The air chamber 41a is compressed according to the movement of the piston 42 while the piston 42 connected to the piston 42 and the piston 42 in the cylinder 41 and the air chamber 41a are disposed at opposite sides. It consists of a hitter 43 hitting the anvil 60.

In addition, the rotation unit 50 is provided with a clutch 51 which meshes with the bevel gear 36 and intermittently transmits the rotational force of the bevel gear 36 to the cylinder 41 to rotate.

In other words, when the clutch 51 is separated by the cam (not shown) to release the engagement with the bevel gear 36, the power transmission of the bevel gear 36 is interrupted, and the clutch 51 ) And the bevel gear 36 mesh with each other, the rotation force of the bevel gear 36 is transmitted to the clutch 51, and the clutch 51 rotates. At the same time, the cylinder 41 rotates to give the anvil 60 a rotational force. It is.

Since the above structure is the same as that of the hammer drill which is a conventional power tool, detailed description is abbreviate | omitted below.

Here, the hammer drill 1 according to an embodiment of the present invention by combining the bit to the tool holder unit 70 provided with the anvil 60, the striking operation and the rotation operation proceeds at the same time, or while the striking operation is in progress In order to reduce the vibration transmitted to the hammer drill 1 when performing the work of crushing or drilling concrete or rock, the primary vibration reduction means 100 and 2 in the main body 10 of the hammer drill 1 are performed. As having the vehicle vibration reducing means 200, it is possible to achieve vibration reduction very effectively.

2 and 3, the primary vibration reducing means 100 may be provided on at least one side or both sides of the crank housing 11 inside the main body 10. Although it is preferable to be provided in both surfaces.

Referring to FIG. 3, the primary vibration reducing means 100 includes a case 110, a guide pin 120 provided across the case 110, and the guide pin 120. The elastic member 130 which is supported on the outer circumferential surface, and the counterweight 140 is provided so that the guide pin 120 is penetrated while the elastic member 130 is inserted and supported at both sides.

As shown in FIGS. 4 and 5, the case 110 is composed of first and second case members 111 and 112 divided into two while forming a cylindrical shape as a whole, and one first case member 111 on one side. A locking protrusion 111a is formed at an upper end of the end, and a locking ring 112a is formed at an upper end of the other second case member 112 to be fastened.

In addition, connecting pieces 111b and 112b are extended and formed at both ends of the first and second case members 111 and 112 constituting the case 110 to fasten the fastening members 113 and 114 such as screws or bolts. It is assembled through the structure.

Since the primary vibration reducing means 100 according to the embodiment of the present invention is sealed by the case 110, a foreign material such as dust is very unlikely to be introduced, so the hammer drill according to the present invention is actually constructed. Even in the field, the counterweight 140 provided inside the case 110 may operate smoothly.

Furthermore, rubber rings 121 are fitted to both end sides of the guide pins 120 to prevent the flow of the guide pins 120, and the case may be moved by the large amplitude of the counterweight 140. It prevents damage to the case 110 because it serves as a buffer when colliding with the 110.

In addition, the elastic member 130 is composed of two, provided on both sides of the counterweight 140, it is preferable to constitute a coil spring (131, 132).

The counterweight 140 is formed in a cylindrical shape, and insertion grooves 141 and 142 having a space to insert a portion of the elastic member 130 are formed on both sides thereof. The insertion grooves 141 and 142 are formed in a structure of a circular groove in the circumferential direction with a predetermined depth so that one side of each of the coil springs 131 and 132 can be easily inserted.

In addition, the counterweight 140 is coupled to reciprocate along the guide pin 120, and has a smaller contact area with the guide pin 120 in comparison with the prior art, thereby changing the amplitude of the counterweight 140 due to friction. It does not occur.

The striking force 43 provided in the hammer drill 1 reciprocates to drill or crush the work object (concrete or rock), and then the transverse direction (from the left side) of the main body 10 in the drawing. Vibration energy generated in the main body 10 in the right direction) is transmitted to the primary vibration reducing means 100 to reduce the vibration of the main body 10 in the resonance frequency band.

At this time, the resonant frequency of the primary vibration reducing means 100 is the mass of the counterweight 140 provided in the case 110 constituting the primary vibration reducing means 100 and the coil spring which is the elastic member 130. It can be adjusted by the spring constant of (131, 132). In other words, the vibration of the main body 10 can be reduced by synchronizing the natural frequency of the main body 10 generated by the reciprocating motion of the striking member 43 and the resonance frequency of the primary vibration reducing means 100.

In addition, the counterweight 140 is made of, for example, brass, it is possible to adjust the mass by changing the shape and dimensions. In addition, since the counterweight 140 is guided along the guide pin 120, a large number of parts, such as expensive cylinders, are not required and can be configured as simple parts.

On the other hand, the hammer drill 1 according to the present invention further includes a secondary vibration reducing means 200, when the vibration of a strong intensity is attenuated through the primary vibration reducing means 100, but of weak strength When vibration occurs, the counterweight 140 of the primary vibration reducing means 100 may not operate smoothly, and thus may not effectively achieve vibration reduction, and thus, the vibration of weak strength through the secondary vibration reducing means 200 may occur. Can be attenuated.

6 and 8, in order to block the vibration transmitted to the handle portion 12 is coupled to one side of the main body 10, the secondary vibration reduction means 200 according to an embodiment of the present invention ) Has a structure provided on the upper side and the lower side to which the main body 10 and the handle portion 12 are coupled.

In detail, first, the upper structure of the handle part 12 will be described. As shown in FIG. 6, the holder 210 is spaced apart from the side surface 10a of the main body 10 inside the handle part 12. Is provided. The dustproof mechanism 220 is provided between the side surface 10a of the main body 10 and the holder 210.

In addition, a pair of insertion tubes 10b protrude and form at intervals on the side surface 10a of the main body 10, and the sleeves 12a are extended and formed in the handle part 12, respectively, so that the holder 210 is extended. ) Has a structure coupled to the sliding through the slide hole (10c) formed in the insertion tube (10b).

The sleeve 12a has a structure that penetrates the holder 210. The sleeve 12a does not slidably penetrate the holder 210 and maintains a penetrated state. In other words, it can be said that they are integrally coupled.

In addition, the sleeve 12a is coupled with a gap d1 in the slide hole 10c of the insertion tube 10b, and the sleeve 12a is handled by inserting a fastening member 211 such as a bolt or a screw into the sleeve 12a. It is coupled to the part 12 and fixed.

In addition, the cover 13 is coupled to each side of the insertion tube 10b and the sleeve 12a. In particular, the hammer drill 1 prevents dust from occurring during operation and protects the interior. In accordance with the vibration generated during the operation of the main body 10 to move the reference to the handle portion 12.

That is, the cover 13 is formed in a zigzag form (or pleated), made of a material such as a rubber material or a common sponge to have elasticity.

Therefore, when the hammer drill 1 is operated to generate vibration, the gap d1 is formed, and thus smoothly slides without friction between the insertion pipe 10b and the sleeve 12a of the main body 10. Even if the vibration generated from the striking part 40 is transmitted, the vibration of the main body 10 is made while moving.

On the other hand, the vibration isolator 220 according to an embodiment of the present invention, as shown in Figure 7, is made of a rubber material and the buffer member 221 to serve as a buffer, and provided inside the buffer member 221 It is a structure including an elastic member 222 to be supported, and a support plate 223 made of a metal material while supporting both ends of the elastic member 222.

In addition, the support plate 223 is formed on both sides of the buffer member 221 to support both ends of the elastic member 222 while being made in a flat shape when the buffer member, the elastic member 222 of the buffer member 221 The inner wall is inserted into and fixed to the shock absorbing member 221 so as not to be damaged.

The elastic member 222 is a coil spring, and is disposed to be buffered in the direction in which vibration by the impact is transmitted.

The secondary vibration reducing means 200 provided on the upper side of the handle portion 12 is disposed at the same or slightly above the striking portion 40, the main body 10 and the handle portion 12 of the hammer drill 1 ) To reduce vibrations.

FIG. 8 is an enlarged view of the engaging portion at the lower side of the handle portion 12. FIG. 8 is an enlarged cross-sectional view of the portion C of FIG. 8 shows the secondary vibration reducing means 200 having another structure provided on the lower side of the handle part 12.

Specifically, the buffer coupling portion 230 is provided on both lower surfaces of the main body 10 (shown up and down in the position of the drawing in FIG. 8), and the lower surface of the handle portion 12 ( 12b), a buffer member 231 penetrated and inserted, a tube 232 penetrated through the buffer member 231 and fitted into the lower surface 10d of the main body 10, and the tube 232 penetrated therethrough. It consists of a fastening member 233, such as a screw or bolt to be coupled.

In addition, the buffer member 231 is preferably formed of a rubber material so that the buffer is good.

In addition, the tube 232 is made of a steel material, it can be configured to be integrally molded by inserting the buffer member 231 of the rubber material. Furthermore, since the tube 232 is made of steel, the tube 232 is firmly maintained with the fastening member 233 coupled to the inside of the tube 232.

A coupling groove 10e is formed in the lower surface 10d of the main body 10 into which the buffer member 231 of the buffer coupling part 230 is inserted, and through the coupling groove 10e, the fastening member ( 233) are combined and fixed.

Moreover, the lower surface 12b of the handle portion 12 fitted to the lower surface 10d of the main body 10 is provided with a gap d2. Thus, when vibration is transmitted from the main body 10, the handle portion 12 is movable in the fixed state without friction due to the gap d2 with the handle portion 12, and furthermore, Since the shock absorbing member 231 is coupled to the inner surface of the lower surface 12b of the handle part 12, when the main body 10 moves according to vibration, the tube 232 and the fastening member 233 simultaneously act as a shock absorbing member ( 231) can be moved by pushing. Therefore, the vibration due to the strike is not transmitted directly to the handle portion 12 is to be alleviated.

 However, the shock absorbing member 231 is provided in contact with the lower surface 10d of the main body 10 through the lower surface 12b of the handle portion 12. Accordingly, the left and right swings of the handle part 12 from the main body 10 are prevented.

If the shock absorbing member 231 is spaced apart from the lower surface 10d of the main body 10, since there is no friction when the main body 10 moves, the shock absorbing member 231 may exhibit a vibration reducing effect by moving in response to the vibration. Since the handle portion 12 may swing left and right, it is preferable that the handle portion 12 is in contact with the lower surface 10d of the main body 10.

However, since the shock absorbing member 232 is made of elastic rubber or sponge, when the main body 10 moves due to vibration, the bottom face of the shock absorbing member 232 and the lower surface 10d of the main body 10 are rubbed. This may interfere with the movement of the main body 10, but because it is made of a flexible material having no rigidity, it does not interfere with the movement of the main body 10.

The present invention, in the secondary vibration reducing means 200 provided on the upper side coupled to the main body 10 and the handle portion 12, from the insertion tube (10b) and the handle portion 12 formed from the main body 10 The gap d1 between the elongated and formed sleeves 12a is at least equal to the gap d2 between the lower surface 10d of the main body 10 provided on the lower side and the lower surface 12b of the handle portion 12b. Or more preferably large.

If the upper gap d1 is smaller than the lower gap d2, the hammer part 1 is disposed on the upper side because the striking portion 40 in which vibration is generated is disposed on the upper side. It is difficult to achieve effective vibration reduction because it is transmitted toward the upper side of 10).

Of course, when assembling the gaps d1 and d2 to a sufficient length, there is no room for friction at all, but the vibration reduction effect is possible, but since the handle part 12 can swing left and right, an appropriate gap ( d1) (d2) length must be maintained.

Therefore, in the case where the gap d1 on the upper side to which the main vibration is transmitted is made relatively larger than the gap d2 on the lower side, compared with the case where the length between the gaps d1 and d2 is the same, Vibration reduction effect can be exhibited while minimizing left and right fluctuations.

In other words, while lowering the left side and the right side of the handle part 12 while preventing vibration, the gap d2 is set to a minimum length, and the upper side gap d1 is effectively exhibited while reducing vibration. The length can be set to reduce the left and right fluctuations.

Even when the gaps d1 and d2 are made the same, the vibration reduction effect can be exhibited and the left and right swings of the handle portion 12 can be prevented, but the position where the vibration is mainly transmitted is the main body 10. Since it is the upper side of, the gap d1 on the upper side needs to be set to the maximum length that can smoothly slide without friction, and the gap d2 on the lower side needs to be set only to the minimum length that can be slid.

If the gaps d1 and d2 are set in the same manner, when the gap d1 on the upper side is set in accordance with the gap d2 on the lower side, it is possible to smoothly move the sliding body due to the vibration on the upper side of the main body 10. If the lower gap d2 is set in accordance with the upper gap d1, a smooth sliding operation is possible, but there is a possibility of swinging left and right. It is preferable to set larger than the clearance gap d2 of the lower side.

According to the present invention, when the vibration is generated by the impact of the striking member 43 by operating the hammer drill 1, the vibration of the main body 10 is first attenuated while being transmitted to the primary vibration reducing means 100. The counterweight 140 provided in the case 110 moves along the guide pin 120 by vibration, and at this time, elasticity is provided in the insertion grooves 141 and 142 formed in both directions of the counterweight 140. Since the coil springs 131 and 132, which are the members 130, are inserted and held, respectively, the vibration is reduced by acting as a buffer according to the movement of the counterweight 140.

In this case, it is effective in the case where a strong intensity vibration force is generated, and in the case where a weak intensity vibration occurs, the movement of the counterweight 140 of the primary vibration reduction means 100 is reduced to effectively reduce vibration. Vibration can not be transmitted to the handle portion 12 as it is, the secondary vibration reducing means 200 is provided on the upper side and the lower side to which the main body 10 and the handle portion 12 is coupled, the vibration of weak strength Can be effectively reduced.

In other words, as shown in FIG. 6, the vibration is reduced by the buffer member 221 provided between the side surface 10a and the holder 210 while being provided on the upper side of the main body 10. The elastic member 222 is carried in the buffer member 221 to further reduce vibration.

In addition, as shown in Figure 7, it is coupled to the lower surface (10d) of the main body 10 through the buffer coupling portion 230 on the lower side of the handle portion 12 can be reduced vibration.

Since the shock absorbing portion 230 is coupled to the cushioning member 231 of the rubber material through the handle portion 12 and the lower surface 10d of the main body 10, even when vibration is transmitted, the body 10 moves. Absorbed by the buffer member 231 to reduce the vibration.

Furthermore, since the lower surface 10d of the main body 10 and the lower surface 12b of the handle portion 12 are fitted with a gap d2, the handle portion held by the worker in the same direction as the vibration direction caused by the impact. 12, the main body 10 can be moved smoothly in a fixed state, and thus the vibration blocking effect is exerted.

If the lower surface 10d of the main body 10 and the handle portion 12 are coupled and fixed integrally, the vibration generated from the main body 10 is transmitted to the handle portion 12 as it is and the handle portion 12 Vibration is transmitted to the hand of the worker holding the as it is to increase the fatigue can reduce the work efficiency, as in the embodiment of the present invention, the lower surface 10d and the handle portion 12 of the main body 10 When the lower surface 12b is coupled with the gap d2, the vibration can move according to the vibration, which results in the vibration being blocked without being transmitted to the operator.

The present invention has been described for the hammer drill as an embodiment of the present invention on the basis of the accompanying drawings for convenience, but various modifications and modifications are possible within the scope of the technical idea of the present invention, such modifications and modifications are the present invention It is obvious that it is included within the scope of the claims.

1: hammer drill
10: main body
10a: side
10b: insertion tube
10c: Slide Ball
10d: lower surface
10e: Coupling groove
11: crank housing
12: handle part
12a: insertion tube
12b: lower surface
13: cover
20: drive means
21: motor
22: axis
30; Power transmission
31: first gear
32: second gear
33: crankshaft
33a: end
34: connecting rod
35: transmission gear
36: Bevel Gear
40: hitting part
41: cylinder
41a: air chamber
42: piston
43: Striker
50: rotating part
51: clutch
60: anvil
70: tool holder
100: primary vibration reducing means
110: case
111: first case
111a: jamming
111b: Connecting piece
112: second case
112a: Hanging Hook
112b: Connecting piece
113, 114: fastening member
120: guide pin
121: ring
130: elastic member
131,132: coil spring
140: counterweight
141,142: Insertion groove
200: secondary vibration reducing means
210: Holder
211: fastening member
220: dustproof mechanism
221: buffer member
222: elastic member
223: support plate
230: buffer coupling portion
231: cushioning member
232: tube
233: fastening member
d1, d2: gap

Claims (13)

Electric movement with primary vibration reduction means and secondary vibration reduction means in the main body and the handle part to reduce the vibration generated during the crushing or drilling work while the blow operation and the rotation operation are simultaneously performed or the blow operation is performed. As a tool,
The primary vibration reducing means,
While provided on at least one side in the body,
Guide pin,
An elastic member which is supported on the outer circumferential surface of the guide pin and stretched in accordance with the vibration direction;
While the elastic member is inserted and supported at both sides, the guide pin is provided to penetrate, and the counterweight moves to reduce vibration while contracting the elastic member along the guide pin, and the elastic member and the counterweight while supporting the guide pin. Including a case to accommodate the
The secondary vibration reducing means,
The sleeve is provided inside the upper side in contact with the main body and the handle part and extends and is formed inside the handle part to allow the main body and the handle part to be slidably moved in accordance with the vibration, thereby inserting a fastening member to engage the main body and the handle part in the slide hole of the insertion tube. Combined in a gap from
And an anti-vibration mechanism part comprising a shock absorbing member for absorbing vibrations between the main body and the inside of the handle part, and an elastic member carried inside the shock absorbing member.
delete delete The method according to claim 1,
Both ends of the guide pin to prevent the flow of the guide pin, the power tool characterized in that it comprises a ring that acts as a buffer in the event of a collision with a large amplitude of the counterweight collision.
The method according to claim 1,
Power tool, characterized in that the holder is provided in the handle portion spaced apart from the side in the main body so as to support the dustproof mechanism.
delete delete The method according to claim 1,
The anti-vibration mechanism is a power tool characterized in that it further comprises a support plate for supporting both ends of the elastic member.
delete The method according to claim 1,
While further provided on the lower side coupled to the main body and the handle portion, the power tool further comprises a secondary vibration reducing means coupled with a gap so that the lower surface of the main body and the lower surface of the handle portion to block vibration.
The method according to claim 10,
Secondary vibration reducing means provided on the lower side of the main body and the handle portion, characterized in that it comprises a buffer member which is composed of a cushioning member fitted in the lower surface of the handle portion, and a fastening member coupled through the buffer member. Power tools.
The method of claim 11,
The buffer member is a power tool characterized in that coupled to the lower surface of the body penetrates through the lower surface of the handle portion.
The method according to claim 11 or 12,
Power tool, characterized in that between the buffer member and the fastening member further comprises a tube for maintaining a fastening force with the fastening member.

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