KR102500749B1 - Electric hammer - Google Patents

Abstract

The present invention relates to an electric hammer, wherein a motor is located between a front handle and a rear handle such that the center of gravity of the electric hammer may be located between both gripping hands. Therefore, the user may feel the electric hammer to be lighter, and the entire length of the electric hammer may be configured to be shorter. To this end, the electric hammer according to the present invention, which can be converted into a drill mode, a hammer mode, and a hammer drill mode, and in which a motor is located between the front handle and the rear handle, may comprise: a cylinder which accommodates a piston applying an impact to a bit; a driving power delivering shaft which delivers the driving power of a motor in a back-and-forth reciprocating movement of a piston, a rotating movement of the cylinder, or both of the back-and-forth reciprocating movement of the piston and the rotating movement of the cylinder; and a motor which is located under the power delivering shaft and delivers driving force to a length middle portion of the power delivering shaft.

Description

Electric hammer {Electric hammer}

The present invention relates to an electric hammer, and in particular, the motor is located between the front handle and the rear handle so that the center of gravity of the electric hammer is located between the two gripping hands so that it can be felt more lightly, and the overall length of the electric hammer is reduced. It is made shorter.

The electric tool rotates the bit by the built-in motor or applies the impact with the linear reciprocating piston, so that the operator can substitute the action to be taken for work, increasing the speed of work and reducing the fatigue of the operator.

Conventionally, an electric drill as an example of a power tool can drill a hole in an object by mounting a bit on a chuck and rotating the bit with a motor.

Recently, through the development of power tools, power tools capable of selectively working in a drill mode in which a bit rotates, a hammer mode in which an impact is applied to an object through a bit, and a mixed mode in which both a drill mode and a hammer mode are simultaneously performed have been developed.

A power tool that drills a hard object by applying an impact is called an electric hammer.

In the drawings, FIG. 1 is a conceptual diagram showing an electric hammer according to the prior art, and FIG. 2 is a cross-sectional view of the electric hammer shown in FIG.

As shown in FIG. 1, the front handle 2F is mounted on the front end of the electric hammer 1, the battery is mounted on the bottom of the rear handle 2B, and the drive unit 3 is mounted on the rear of the front handle 2F. is located, the motor 4 is mounted at the rear of the drive unit 3, and the rear handle 2B is located at the rear of the motor 4.

As the front handle 2F, the drive unit 3, the motor 4, and the rear handle 2B are configured in a row as described above, the conventional electric hammer 1 is generally long, and the motor 4 is an electric hammer ( As it is located on the rear side of 1), the center of gravity of the electric hammer 1 is biased to the rear, and a lot of load is placed on the hand holding the rear handle 2B, which increases discomfort and fatigue in work.

The reason why the drive unit 3 and the motor 4 are arranged in a row is that the piston 11 applying the impact in the hammer mode reciprocates in the longitudinal direction of the electric hammer 1, and the power of the motor 4 is applied to the piston The power transmission shaft 13, which transmits the linear reciprocating motion of (11), is also located in the longitudinal direction of the electric hammer 1, and as the motor 4 is connected to the rear end of the power transmission shaft 13, the piston 11 This is because the moving direction, the power transmission shaft 13, and the shaft of the motor 4 are all designed to be located in the longitudinal direction of the electric hammer 1.

In this way, as the moving direction of the piston 11, the power transmission shaft 13, and the shaft of the motor 4 are located in one direction, the length of the electric hammer 1 increases, and the motor 4 is located in the rear. There is a problem in that the center of gravity is biased, which increases difficulty and fatigue in work.

Republic of Korea Patent Registration No. 10-0194896 (1999.06.15.) Japanese Unexamined Patent Publication No. 2021-84216 (2021.06.03.)

The present invention was invented to solve the problems of the prior art as described above, and the overall length can be reduced as the motor and the power transmission shaft are positioned vertically, and the motor is located between the front handle and the rear handle. The purpose is to provide an electric hammer configured to increase the sense of balance in gripping and working with the electric hammer.

The present invention for achieving the above object is an electric hammer that can be switched to a drill mode, a hammer mode, and a hammer drill mode and has a motor located between the front handle and the rear handle, which accommodates a piston that impacts the bit. A power transmission shaft that transmits the power of the cylinder and the motor to the forward and backward reciprocating motion of the piston, or to the rotational motion of the cylinder, or simultaneously to the forward and backward reciprocating motion of the piston and the rotational motion of the cylinder, and is located below the power transmission shaft It is technically characterized by including a motor that transmits power to the middle part of the length of the transmission shaft.

In addition, according to a preferred embodiment of the present invention, the power transmission shaft located below the cylinder in parallel with the cylinder is located below the cylinder and is located at the rear of the drill shaft for rotating the cylinder and the drill shaft and transmits the power of the motor. It is divided into a drive shaft that receives and rotates, and a hammer shaft that is located at the rear of the drive shaft and is connected to the piston to move the piston forward and backward.

In addition, according to a preferred embodiment of the present invention, a driven bevel gear is mounted on the driving shaft, and a driving bevel gear is mounted on the shaft of the motor to transmit power of the motor to the driving shaft by meshing with each other.

In addition, according to a preferred embodiment of the present invention, a drive spur gear is mounted on the drill shaft and a driven spur gear is mounted on the cylinder to transmit the power of the drill shaft to the rotation of the cylinder by interlocking with each other.

In addition, according to a preferred embodiment of the present invention, a swash bearing is mounted on the hammer shaft, and the swash bearing is connected to the piston to transmit the power of the hammer shaft to the linear reciprocating motion of the piston.

In addition, according to a preferred embodiment of the present invention, a first clutch for transmitting or blocking the power of the driving shaft to the drill shaft, and a second clutch for transmitting or blocking the power of the driving shaft to the hammer shaft.

In addition, according to a preferred embodiment of the present invention, a mode conversion knob is mounted on the side of the main body of the electric hammer, and any one of the drill mode, hammer mode, and hammer drill mode is selected by rotation of the mode conversion knob.

In addition, according to a preferred embodiment of the present invention, a first bracket connecting the mode changeover knob and the second clutch and a second bracket connecting the mode changeover knob and the first clutch are included, and when the mode changeover knob is rotated, the The 1st bracket and the 2nd bracket move, and the 2nd clutch and the 1st clutch respectively connected to the 1st bracket and 2nd bracket move, transmitting the power of the driving shaft to the hammer shaft or to the drill shaft, or to the hammer shaft and the drill shaft. delivered at the same time

In addition, according to a preferred embodiment of the present invention, when the mode conversion knob is neutral, it is a hammer drill mode, when the mode conversion knob rotates in one direction, it is a drill mode, and when the mode conversion knob rotates in the other direction, it is a hammer mode. Inside the springs press the first bracket and the second bracket so that the mode conversion knob is positioned in the neutral position.

In addition, according to a preferred embodiment of the present invention, the drive spur gear mounted on the drill shaft, the rear end is connected to the mode conversion knob, the front end is located in front of the drive spur gear, and the front end is formed with a latch portion matched with the drive spur gear. It includes a third bracket, and the latch unit matches the drive spur gear in hammer mode, and the latch unit is spaced apart from the drive spur gear in drill mode and hammer drill mode.

Further, according to a preferred embodiment of the present invention, the latch unit further includes a spring providing an elastic force in a direction away from the drive spur gear.

As described above, the electric hammer according to the present invention can reduce the overall length of the electric hammer as the motor is positioned in the vertical direction of the power transmission shaft to transmit power, and the center of gravity is located toward the center of the length of the electric hammer. The center of gravity is balanced, so it is convenient for workers to work and has the advantage of reducing fatigue.

1 is a conceptual diagram showing an electric hammer according to the prior art;
2 is a cross-sectional view of the electric hammer shown in FIG. 1;
3 is a perspective view showing an electric hammer according to the present invention;
4 is a cross-sectional view of the electric hammer shown in FIG. 3;
5 is a perspective view showing a clutch and a gear of the power transmission shaft shown in FIG. 4;
6 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention is switched to the drill mode;
7 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention is switched to the hammer mode;
8 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention implements a drill mode and a hammer mode at the same time.

Hereinafter, a preferred embodiment of the electric hammer according to the present invention will be described in detail with reference to the accompanying drawings.

In the drawings, FIG. 3 is a perspective view showing an electric hammer according to the present invention, FIG. 4 is a cross-sectional view of the electric hammer shown in FIG. 3, and FIG. 5 is a perspective view showing the clutch and gear of the power transmission shaft shown in FIG. 6 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention is switched to the drill mode, and FIG. 7 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention is switched to the hammer mode, 8 is a conceptual diagram showing the power transmission relationship when the electric hammer according to the present invention implements a drill mode and a hammer mode at the same time.

As shown in FIG. 3 or 4, the electric hammer 100 has a chuck 114 capable of mounting a bit on the front side, and a front handle 111 is mounted on the side of the chuck 114. In addition, a mode conversion knob 113 is mounted on the side of the main body 110 of the electric hammer 100, and a motor 115 is built into the body case 110C under the mode conversion knob 113. In addition, a rear handle 117 is mounted at the rear end of the electric hammer 100, and a battery mounting portion 119 is formed at the lower end of the rear handle 117 to supply power necessary for operating the motor 115 by mounting a battery.

Below, the electric hammer configured as described above will be described in detail.

As shown in FIGS. 3 to 5, inside the electric hammer 100, a piston 123 that applies an impact to the bit is accommodated in a cylinder 121, and the cylinder 121 is horizontal on the top of the main body 110 , the power transmission shaft 130 is positioned horizontally below the piston 123, and the swash bearing 150 is mounted at the rear end of the power transmission shaft 130. The rod 150R of the swash bearing 150 is connected to the upper piston 123. Accordingly, when the power transmission shaft 130 rotates, the piston 123 moves forward and backward by the swash bearing 150 and strikes a bit located in the front to enable hammering.

Meanwhile, a driven bevel gear 142 is mounted in the middle of the length of the power transmission shaft 130, and the driving bevel gear 141 meshed with the driven bevel gear 142 is a motor 115 positioned vertically below the power transmission shaft 130. ) is mounted on the axis of Therefore, when the motor 115 operates, the drive bevel gear 141 rotates, and the driven bevel gear 142 meshed with the drive bevel gear 141 rotates so that the power transmission shaft 130 is rotatable.

In addition, the driven spur gear 144 is mounted on the cylinder 121 surrounding the piston 123, and the driven spur gear 144 is engaged with the driving spur gear 143 mounted on the front end of the power transmission shaft 130. Located. Therefore, when the power transmission shaft 130 rotates, the driving spur gear 143 and the driven spur gear 144 interlock to rotate the cylinder 121 and fix it to the chuck 114 connected to the cylinder 121 and the chuck 114. The bit rotated as well.

Two clutches 161 and 162 are mounted on the power transmission shaft 130, and the clutch located between the driven bevel gear 142 and the drive spur gear 143 is referred to as a first clutch 161, and the driven bevel gear A clutch positioned between the swash bearing 142 and the swash bearing 150 is referred to as a second clutch 162.

Here, the first clutch 161 transmits or blocks power to the drive spur gear 143, and the second clutch 162 transmits or blocks power to the swash bearing 150.

Therefore, when power is transmitted only to the driving spur gear 143 by operating the first clutch 161, the drill mode is switched and the bit rotates. When the power is transmitted only to the swash bearing 150 by operating the second clutch 162, it is converted to a hammer mode and the piston 123 applies an impact to the bit while moving in the forward and backward directions. In addition, when power is simultaneously transmitted to the drive spur gear 143 and the swash bearing 150 through the first clutch 161 and the second clutch 162, it is converted to the hammer drill mode (mixed mode) to rotate the bit and Hammering takes place simultaneously.

In addition, in the electric hammer 100 according to the present invention, a locking function for locking the drive spur gear 143 is further added to prevent rotation of the bit in the hammer mode.

Mode conversion is performed through the mode conversion knob 113 mounted on the side of the electric hammer 100.

As shown in FIGS. 6 to 8, the mode conversion knob 113 is formed on the middle side of the electric hammer 100, and as an example, when the mode conversion knob 113 is located in neutral, it is a hammer drill mode, When the mode conversion knob 113 is rotated counterclockwise from neutral, the drill mode is switched, and when the mode conversion knob 113 located at neutral is rotated clockwise, the hammer mode is switched.

The power transmission shaft 130 is divided into three shafts, the driven bevel gear 142 is mounted on the drive shaft 132 located in the middle, the driving spur gear 143 is mounted on the drill shaft 131, and the hammer shaft ( 133), the swash bearing 150 is mounted, and the first clutch 161 connects the drive shaft 132 and the drill shaft 131 to transmit power to the drill shaft 131 or block power transmission. The second clutch 162 connects the drive shaft 132 and the hammer shaft 133 to transmit power to the hammer shaft 133 or block power transmission.

6 to 8, three brackets 171, 172, and 173 connected to the mode conversion knob 113 are mounted inside the case 110C of the main body 110, and the first bracket 171 The mode conversion knob 113 and the second clutch 162 are connected, so when the mode conversion knob 113 is converted to the drill mode, the second clutch 162 is pushed backward to provide power to the hammer shaft 133 block transmission. In this case, the power transmitted from the motor 115 to the drive shaft 132 is transmitted only to the drill shaft 131 through the first clutch 161, and the drive spur gear 143 mounted on the front end of the drill shaft 131 The driven spur gear 144, the cylinder 121 and the bit rotate through.

In this state, when the mode conversion knob 113 is rotated clockwise to be positioned in the neutral position, the first bracket 171 advances and moves the second clutch 162 forward. Then, the power of the drive shaft 132 is distributed and transmitted to the drill shaft 131 through the first clutch 161 and to the hammer shaft 133 through the second clutch 162 . In this case, as described above, the cylinder 121 and the bit rotate due to the rotation of the drill shaft 131, and at the same time, the swash bearing 150 operates according to the rotation of the hammer shaft 133 to hit the piston 123 Thus, hammering is performed.

On the other hand, the second bracket 172 connects the mode changeover knob 113 and the first clutch 161, so when the neutral mode changeover knob 113 is rotated clockwise to switch to the hammer mode, the second bracket As the 172 moves forward, power transmission between the drill shaft 131 and the drive shaft 132 is blocked. Then, as described above, the drive shaft 132 is connected to the hammer shaft 133 by the second clutch 162 so that the power of the drive shaft 132 is transmitted only to the hammer shaft 133, and only hammering is performed.

Meanwhile, the third bracket 173 extends from the mode conversion knob 113 to the front end of the drive spur gear 143, and the latch portion corresponding to the cross section of the drive spur gear 143 is provided at the front end of the third bracket 173. (173L) is formed.

When the mode conversion knob 113 is in a drill mode or a neutral hammer drill mode, the latch unit 173L is spaced apart from the front of the driving spur gear 143, but when switched to the hammer mode, the mode conversion knob 113 As the third bracket 173 moves backward by the rotation of , the latch unit 173L is matched with the drive spur gear 143 and the drive spur gear 143 is locked so that it does not rotate.

Accordingly, in the hammer mode, transmission of power to the drill shaft 131 is blocked, and at the same time, the latch unit 173L locks the driving spur gear 143 to block rotation of the bit by hammering.

6 to 8, when the mode conversion knob 113 is neutral, the first clutch 161 and the second clutch 162 transmit power to the drill shaft 131 and the hammer shaft 133. The springs (S) press the first bracket (171) to the third bracket (173) so that they are located at the fulcrum, and when the mode conversion knob (113) is rotated in hammer mode or drill mode, each bracket (171, 172, 173) The springs (S) supporting the expand and contract by the rotation of the mode conversion knob (113).

100: electric hammer
110: body
111: front handle
113: mode conversion knob
114: Chuck
115: motor
117: rear handle
119: battery mounting part
121: cylinder
123: piston
130: power transmission shaft
131: drill axis
132: drive shaft
133: hammer axis
141, 142: bevel gear
143, 144: spur gear
150: swash bearing
150R: load
161, 162: clutch
171, 172, 173: bracket
173L: latch part
S: spring

Claims (11)

It is an electric hammer that can be switched to drill mode, hammer mode, and hammer drill mode, and the motor is located between the front handle and the rear handle.
A cylinder 121 accommodating a piston 123 that applies an impact to the bit;
Power that transmits the power of the motor 115 to the forward and backward reciprocating motion of the piston 123, or to the rotational motion of the cylinder 121, or simultaneously to the forward and backward reciprocating motion of the piston 123 and the rotational motion of the cylinder 121 transmission shaft 130;
It is located below the power transmission shaft 130 and includes a motor 115 that transmits power to the middle of the length of the power transmission shaft 130,
The power transmission shaft 130, which is located parallel to the cylinder 121 under the cylinder 121,
A drill shaft 131 located below the cylinder 121 and rotating the cylinder 121, a drive shaft 132 located behind the drill shaft 131 and rotated by receiving power from the motor 115, It is located at the rear of the drive shaft 132 and is divided into a hammer shaft 133 that is connected to the piston 123 and moves the piston 123 in the forward and backward directions,
A first clutch 161 for transmitting or blocking the power of the drive shaft 132 to the drill shaft 131;
And a second clutch 162 for transmitting or blocking the power of the driving shaft 132 to the hammer shaft 133,
A mode conversion knob 113 is mounted on the side of the main body 110 of the electric hammer 100, and any one of the drill mode, hammer mode, and hammer drill mode is selected by rotation of the mode conversion knob 113,
A driving spur gear 143 mounted on the drill shaft 131;
The rear end is connected to the mode conversion knob 113, the front end is located in front of the driving spur gear 143, and the front end includes a third bracket 173 having a latch portion 173L matched with the driving spur gear 143. and
In the hammer mode, the latch portion 173L matches the drive spur gear 143, and in the drill mode and hammer drill mode, the latch portion 173L is spaced apart from the drive spur gear 143,
The electric hammer characterized in that the latch portion (173L) further comprises a spring (S) for providing an elastic force in a direction spaced apart from the driving spur gear (143).
delete According to claim 1,
A driven bevel gear 142 is mounted on the drive shaft 132, and a drive bevel gear 141 is mounted on the shaft of the motor 115 to transmit the power of the motor 115 to the drive shaft 132 by meshing with each other. Electric hammer that does.
According to claim 1,
The drive spur gear 143 is mounted on the drill shaft 131, and the driven spur gear 144 is mounted on the cylinder 121 to transmit the power of the drill shaft 131 to the rotation of the cylinder 121 by interlocking with each other. A featured electric hammer.
According to claim 1,
A swash bearing 150 is mounted on the hammer shaft 133, and the swash bearing 150 is connected to the piston 123 to transmit the power of the hammer shaft 133 to the linear reciprocating motion of the piston 123. A featured electric hammer.
delete delete According to claim 1,
A first bracket 171 connecting the mode conversion knob 113 and the second clutch 162;
It includes a second bracket 172 connecting the mode conversion knob 113 and the first clutch 161,
When the mode conversion knob 113 is rotated, the first bracket 171 and the second bracket 172 move, and the second clutch 162 connected to the first bracket 171 and the second bracket 172, respectively, While the first clutch 161 moves, the power of the driving shaft 132 is transmitted to the hammer shaft 133, to the drill shaft 131, or to the hammer shaft 133 and the drill shaft 131 at the same time. Electric hammer that does.
According to claim 8,
When the mode conversion knob 113 is neutral, it is a hammer drill mode, when the mode conversion knob 113 rotates in one direction, it is a drill mode, and when the mode conversion knob 113 rotates in the other direction, it is a hammer mode, and the main body 110 ) Inside the electric hammer, characterized in that the springs (S) press the first bracket 171 and the second bracket 172 so that the mode conversion knob 113 is located in the neutral position.
delete delete

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