TWI753530B - Electric Grinding Tool Machine - Google Patents

Abstract

An electric grinding tool machine, comprising a holding body, a grinding disc and a battery, the holding body is provided with a tool shaft connected to the grinding disc, a driving component that can make the tool shaft rotate when receiving electricity, and an electric The driving assembly and the circuit board of the battery are sexually connected, and the holding body has a battery mounting seat exposed on the outside. Wherein, the board surface of the circuit board is not perpendicular to the tool axis, the circuit board and the battery mounting seat are respectively located on two opposite sides of the tool axis, and the connection line between the circuit board and the battery mounting seat passes through the tool axis. The present invention reduces the height of the holding body by changing the position of the circuit board, thereby lowering the center of gravity of the holding body, so as to increase the stability of the grinding operation.

Description

Electric Grinding Tool Machine

The present invention relates to an electric grinding tool machine, in particular to an electric grinding tool machine which lowers the center of gravity of the holding body.

Check, US 2020230796A, US 2006068689A and US 2018056473A have disclosed the configuration of the internal components of the electric abrasive tool. The internal structure of the conventional electric grinding tool 50 is as shown in FIG. 1 herein. The electric grinding tool 50 includes a holding body 51 , a grinding disc 52 and a battery 53 . The holding body 51 has a A tool shaft 511 inside the holding body 51 and assembled with the grinding disc 52 , a driving component 512 arranged in the holding body 51 and driving the tool shaft 511 when receiving electricity, and a driving component 512 inside the holding body 51 And connect the drive assembly 512 to the circuit board 513 of the battery 53 . Wherein, since the circuit board 513 is conventionally disposed on the top of the tool shaft 511 (eg, at 515 ), the internal components of the electric grinding tool 50 present a linear up-down configuration. That is to say, the conventional height 514 of the holding body 51 is equal to the sum of the height of the circuit board 513 , the height of the tool shaft 511 and the height of the top of the holding body 51 . However, the disadvantage of the conventional configuration is that the center of gravity of the holding body 51 cannot be lowered due to the high height 514 of the conventional holding body 51. When the user operates and moves the electric grinding machine 50, the holding The main body 51 is easily unstable and falls over. Especially when the user operates the electric abrasive tool 50 to grind an upright board surface, it is more difficult to control the electric abrasive tool 50 stably.

On the other hand, since the circuit board 513 is conventionally disposed on the top of the tool shaft 511 , that is, the circuit board 513 is disposed on the side of the holding body 51 close to the user's palm. The electric research When the grinding machine 50 is in operation, the circuit board 513 will receive electricity to generate heat energy, so that the temperature of the side of the grip body 51 close to the user's palm is increased. When the electric grinding tool 50 is used for a long time, the circuit board 513 will transmit a large amount of thermal energy to the holding body 51 , making it difficult for the user to hold the holding body 51 , thereby affecting the grinding operation.

The main purpose of the present invention is to solve the problem caused by the high center of gravity of the holding body caused by the circuit board of the conventional electric grinding tool machine being arranged on the top of the tool shaft.

Another object of the present invention is to solve the problem that the temperature of the grip body increases after the conventional circuit board receives electric power and generates thermal energy, thereby affecting the user's comfort in gripping the grip body.

In order to achieve the above-mentioned purpose, the present invention provides an electric grinding tool machine, which includes a holding body, a grinding disc and a battery. The holding body is provided with a tool shaft connected to the grinding disc. The shaft-rotating drive assembly is a circuit board electrically connecting the drive assembly and the battery, and the holding body has a battery mounting seat exposed on the outside. Further, the board surface of the circuit board is not perpendicular to the tool axis, the circuit board and the battery mounting seat are respectively located on two opposite sides of the tool axis, and the connection line between the circuit board and the battery mounting seat passes through the tool axis .

In one embodiment, the holding body is formed with a plurality of ventilation holes, and the ventilation holes form an air path passing through the circuit board.

In one embodiment, a plurality of ventilation holes are formed on the holding body, and the ventilation holes form a first air path passing through the circuit board and a second air path flowing on the side of the driving component not facing the circuit board .

In one embodiment, the drive assembly includes a rotor connected to the tool shaft and a stator implemented in cooperation with the rotor.

In one embodiment, the electric grinding tool includes an assembly housing provided in the grip body and provided with the driving component disposed therein, the assembly housing including a tube body and two respectively disposed on both sides of the tube body. cover.

In one embodiment, the tool shaft is provided with a counterweight body and a fan blade assembled on the counterweight body and rotated synchronously with the tool shaft.

In one embodiment, the counterweight body has a first counterweight portion and a second counterweight portion arranged up and down, the second counterweight portion is eccentric relative to the first counterweight portion, and the fan blade is disposed on the first counterweight portion. On the second counterweight.

In one embodiment, the holding body is formed with at least one opening facing the counterweight at one end close to the grinding disc.

In one embodiment, the holding body defines a side of the circuit board as a front side, and the electric grinding tool has an operation panel disposed on the front side of the holding body and electrically connected to the circuit board.

In one embodiment, the holding body has a receiving space on the inner wall surface facing the driving component and providing the circuit board.

In one embodiment, a protruding portion is formed on the outer surface of the holding body relative to the receiving space, and the protruding portion provides a commercial sign and is disposed on it.

In one embodiment, the battery mount has an insertion opening, and the insertion opening is perpendicular to the tool axis.

In one embodiment, the battery mount has an insertion opening, and the insertion opening is parallel to the tool axis.

According to the foregoing disclosure, compared with the conventional technology, the present invention has the following features: the present invention changes the position of the circuit board, so that the circuit board is disposed on the tool shaft not facing the The other side of the battery mount, while the board surface is set not to be perpendicular to the tool axis. In this way, the height of the gripping body of the present invention is about the sum of the height of the tool shaft and the height of the top of the gripping body, which is lower than that of the conventional gripping body, so that the gripping body can be lowered. The center of gravity allows the user to operate the grip body more stably. On the other hand, since the circuit board of the present invention is no longer disposed on the side of the tool shaft not facing the grinding disc, the user's operation will not be affected by the temperature increase of the circuit board when the user grasps the holding body.

10: Electric grinding tool machine

11: Hold the body

101: Height

111: Head

112: Neck

113: Shoulder

114: Tool shaft

115: Drive components

116: circuit board

117: Counterweight

118: The first counterweight

119: Second counterweight

120: extension direction

121: Battery mount

122: Assumed axis

123: Vent hole

124: The first gas path

125: Opening

126: fan blade

127: Second gas path

132: Rotor

133: Stator

134: Assembly column

135: First Bearing

136: Second Bearing

137: Front side

138: Insertion opening

139: Conductive terminal

140: Directions

141: Shaft extension direction

142: Direction

143: Storage space

144: convex part

15: Grinding disc

151: Ontology

152: Assembly

16: Battery

161: Boss

162: Conductive hole

17: Assembly shell

171: Tube body

172:Capping

173: Assembly

18: Operation panel

181: Control signal

50: Electric Grinding Tool Machine

51: Hold the body

511: Tool shaft

512: Drive assembly

513: circuit board

514: height

515: Tool shaft tip

52: Grinding disc

53: Battery

FIG. 1 is a schematic cross-sectional view of a conventional electric abrasive tool machine.

FIG. 2 is a schematic three-dimensional structure diagram of an embodiment of the present invention.

FIG. 3 is a schematic exploded view of the structure of an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view (1) of an embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view (2) of an embodiment of the present invention.

FIG. 6 is a schematic diagram of a unit according to an embodiment of the present invention.

FIG. 7 is a schematic three-dimensional structure diagram of another embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of another embodiment of the present invention.

The detailed description and technical content of the present invention are described in conjunction with the drawings as follows: Please refer to FIG. 2 to FIG. 5 , the present invention provides an electric grinding tool machine 10 . The electric grinding tool machine 10 includes a holding body 11 and a grinding disc 15 . and a battery 16 . In one embodiment, the holding body 11 includes a head 111 , a neck 112 , and a shoulder 113 . The head 111 is held by the user to control the holding body 11 . In addition, the neck 112 extends from one side of the head 111 , and the diameter of the neck 112 is smaller than the diameter of the head 111 and also smaller than the diameter of the shoulder 113 . In addition, the shoulder 113 connects to the neck 112 and faces the neck 112 Extending in the direction not facing the head 111 , the diameter of the shoulder 113 increases gradually from the side of the shoulder 113 facing the neck 112 to the side of the shoulder 113 away from the neck 112 , so that the shoulder 113 trumpet shape. In addition, the side of the shoulder 113 that is not connected to the neck 112 faces the grinding disc 15 , and the diameter of the shoulder 113 away from the neck 112 corresponds to the diameter of the grinding disc 15 .

Further, the holding body 11 further includes a tool shaft 114 , a driving component 115 , and a circuit board 116 . Specifically, the tool shaft 114 is disposed in the holding body 11 , and one end of the tool shaft 114 is assembled with the grinding disc 15 . In one embodiment, the grinding disc 15 includes a body 151 and an assembly 152 connected to the body 151 , and the tool shaft 114 is connected to the assembly 152 . In addition, in one embodiment, the tool shaft 114 is connected to a counterweight 117 facing the grinding disc 15 , and the counterweight 117 has a first counterweight portion 118 and a second counterweight portion 119 arranged up and down. The second counterweight portion 119 is disposed below the first counterweight portion 118 , and the second counterweight portion 119 is eccentric relative to the first counterweight portion 118 . Therefore, through the setting of the counterweight body 117 , The tool shaft 114 can drive the grinding disc 15 to generate an eccentric rotation stroke. On the other hand, the driving component 115 is assembled with the tool shaft 114 and located in the holding body 11 . The driving component 115 can be an electric motor, and the driving component 115 drives the tool shaft 114 to rotate after receiving electricity. In addition, the circuit board 116 is electrically connected to the driving element 115 and the battery 16 , and the circuit board 116 is used to control the operation of the driving element 115 . In this embodiment, the circuit board 116 can be fixed on the inner wall of the holding body 11 , so that the circuit board 116 can be disposed on the neck 112 of the holding body 11 . In more detail, the circuit board 116 has an extension direction 120 along the board surface, the board surface is the plane on which the electronic components are arranged on the circuit board 116 , and the extension direction 120 of the circuit board 116 is not perpendicular to the tool axis 114 . In one embodiment, the extending direction 120 of the circuit board 116 is closer to the tool shaft 114 Parallel arrangement can be adopted to reduce the height of the holding body 11 . On the other hand, the holding body 11 has a battery mounting seat 121 exposed on the surface. The battery mounting seat 121 is used for assembling the battery 16 , so that the power of the battery 16 can be transmitted to the battery through the battery mounting seat 121 . circuit board 116 . In addition, the battery mounting seat 121 is disposed on the side of the tool shaft 114 that does not face the circuit board 116 , the battery mounting seat 121 and the circuit board 116 are located on the same hypothetical axis 122 , and the battery mounting seat 121 and the circuit board 116 are located on opposite sides of the tool shaft 114, respectively. Viewed from the angle of FIG. 4 , the hypothetical axis 122 is orthogonal to the extension direction of the shaft of the tool shaft 114 (eg, reference numeral 141 ).

Therefore, in the present invention, by changing the position of the circuit board 116 , the height 101 of the holding body 11 can be subtracted from the height of the circuit board 116 , which is approximately equal to the height of the tool shaft 114 and the height of the top of the holding body 11 . To sum up, thereby reducing the height 101 of the holding body 11 and achieving the purpose of lowering the center of gravity of the holding body 11 . Through the present invention, when the user operates the electric grinding machine 10, the center of gravity of the gripping body 11 is lowered, so that the gripping body 11 is less likely to tip over when displaced by the operation, and can more stably approach the grinding surface. Especially when the user grinds the upright board surface, the user does not need to spend a lot of effort to control the holding body against the action of gravity, so that the holding body 11 can be close to the board surface, which is convenient for the user to operate. The grinding quality of the electric grinding machine 10 is improved. Furthermore, since the circuit board 116 of the present invention is no longer disposed on the head 111 of the holding body 11 , the user is not affected by the temperature of the circuit board 116 when holding the head 111 , which is convenient for the user to operate. .

2 to 5 , in one embodiment, in order to improve the heat dissipation effect of the circuit board 116 , the grip body 11 is formed with a plurality of ventilation holes 123 , and the ventilation holes 123 are located between the driving element 115 and the driving element 115 . At the position between the circuit boards 116 , the ventilation holes 123 form a heat exchange with the circuit board 116 when the air flow inside the electric grinding machine 10 changes. the first gas path 124. For example, the ventilation holes 123 may be disposed on two opposite sides of the holding body 11 , and one of the ventilation holes 123 located on one side of the holding body 11 can allow external air to enter the holding body 11 , It passes through the circuit board 116 in parallel, and then is discharged from the ventilation holes 123 on the other side of the holding body 11 , thereby allowing the circuit board 116 to dissipate heat. In yet another embodiment, the ventilation holes 123 can also be located between the driving element 115 and the battery mounting seat 121 , so that the ventilation holes 123 can also form a second air path passing through the driving element 115 . 127. As a further example, the ventilation holes 123 can also be respectively disposed on two opposite sides of the holding body 11 , and the ventilation holes 123 located on one side of the holding body 11 allow air to enter from the outside, and the air will The flow on the side of the driving element 115 not facing the circuit board 116 is discharged through the vent holes 123 on the other side of the holding body 11 . In this way, when the driving element 115 is driven to operate, the heat energy of the driving element 115 can be dissipated through the air from the second air passage 127 , thereby avoiding the temperature of the head 111 of the holding body 11 It is too high and difficult for users to hold, and at the same time, it also reduces the radiation of the heat energy of the driving element 115 to the circuit board 116 , and reduces the problem of the circuit board 116 being damaged by the accumulated heat and the life and use stability of the circuit board 116 . In addition, in this embodiment, when the battery 16 is inserted into the battery mounting seat 121 , the air in the second air path 127 can not only provide heat dissipation for the driving component 115 , but also supply power to the battery 16 at the same time. The heat energy generated during the heat exchange. It should be noted that the airflow directions of the first air passage 124 and the second air passage 127 described herein are only for illustration, and are not intended to limit the present case.

In addition, the tool shaft 114 has a fan blade 126 assembled on the counterweight body 117 , the fan blade 126 is disposed on the second counterweight portion 119 and is driven by the tool shaft 114 , thereby making the fan blade 126 It rotates synchronously with the tool shaft 114 . In another embodiment, the holding body 11 is formed with at least one opening 125 facing the counterweight 117 at one end close to the grinding disc 15 , and the opening 125 can allow gas to enter the holding body from the outside. within 11.

On the other hand, please refer to FIG. 2 to FIG. 5, in one embodiment, the driving assembly 115 includes a rotor 132 and a stator 133, wherein the rotor 132 is connected with the tool shaft 114, The rotor 132 starts to rotate after being acted by the magnetic force, and then drives the tool shaft 114 to rotate accordingly. In addition, the stator 133 is disposed on the periphery of the rotor 132 and is implemented in cooperation with the rotor 132 . The specific structure of the stator 133 and the matching manner of the stator 133 and the rotor 132 are known to those skilled in the art, and will not be repeated here.

Further, the electric grinding tool 10 includes an assembly shell 17 in which the drive assembly 115 is disposed, the assembly shell 17 is located in the holding body 11 , and the assembly shell 17 includes a tube body 171 and two Covers 172 are respectively provided on both sides of the tube body 171 . More specifically, the tube body 171 is used for the stator 133 and the rotor 132 to be disposed therein. In one embodiment, the tube body 171 is used for the stator 133 to be fixed thereon. In another embodiment, the stator 133 is formed with at least one set of connecting posts 134 , and the connecting posts 134 are assembled with one of the covers 172 , so that the stator 133 can be fixed in the tube body 171 . In addition, the two covers 172 are used to close the tube body 171 , thereby preventing the dust generated by the electric grinding machine 10 from entering the driving assembly 115 during grinding. In one embodiment, each cover 172 includes at least one assembly 173 , and the assembly 173 can fix the cover 172 and the tube body 171 by screwing. In another embodiment, the driving assembly 115 includes at least one first bearing 135 disposed on the tool shaft 114 , and the first bearing 135 may be disposed on the tool shaft 114 facing one of the covers 172 . On one side, the first bearing 135 is used to reduce the friction force generated when the tool shaft 114 rotates. On the other hand, in one embodiment, the tool shaft 114 may be provided with at least one second bearing 136 located on the counterweight 117 , the second bearing 136 assists the counterweight 117 to reduce the impact of the tool shaft The frictional force when 114 acts and rotates.

On the other hand, please refer to FIG. 3 to FIG. 6 , in one embodiment, the holding body 11 defines the side of the circuit board 116 as a front side 137 , and the electric grinding machine 10 has one side on the holding body 137 . Holding the operation panel 18 on the front side 137 of the main body 11 , the operation panel 18 is electrically connected to the circuit board 116 , the operation panel 18 generates a control signal 181 to the circuit board 116 after being operated, and the circuit board 116 according to the The content of the control signal 181 controls the driving element 115 to start or stop working.

In addition, the battery mounting seat 121 of the present invention has an insertion opening 138 and two conductive terminals 139 disposed in the insertion opening 138, the battery 16 is formed with a boss 161 protruding facing the battery mounting seat 121, and a plurality of The two conductive terminals 139 are inserted into two of the conductive holes 162 in the conductive holes 162 provided on the boss 161 . Further, the insertion opening 138 is defined by the assembly direction of the battery 16 . For the purpose of FIG. 3 herein, the insertion opening 138 (such as the reference numeral 140 ) is perpendicular to the extension direction of the shaft of the tool shaft 114 ( 141 ), that is, the battery 16 is assembled on the battery mounting base 121 in a horizontal insertion manner.

On the other hand, in another embodiment, the direction of the insertion opening 138 (such as the reference numeral 142 ) can also be parallel to the extending direction of the shaft of the tool shaft 114 (such as the reference numeral 141 ). In this way, the battery 16 is straight It is assembled on the battery mounting seat 121 in a plug-in manner, as shown in FIG. 7 herein. Also, please refer to FIG. 8 , in one embodiment, the holding body 11 of the present invention has a receiving space 143 on the inner wall surface of the driving component 115 , the receiving space 143 is disposed on the front side 137 and located in the At the position of the neck 112 , the receiving space 143 is used for the circuit board 116 to be arranged therein. In one embodiment, a convex portion 144 is formed on the outer surface of the holding body 11 relative to the receiving space 143 , and the convex portion 144 can provide a commercial sign (not shown in the figure) on the top, wherein the The trade mark may be a trademark or a product model.

To sum up, the above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention, that is, all equivalent changes and modifications made according to the scope of the patent application of the present invention should still belong to the present invention. patent coverage.

10: Electric grinding tool machine

11: Hold the body

101: Height

114: Tool shaft

116: circuit board

118: The first counterweight

119: Second counterweight

120: extension direction

121: Battery mount

123: Vent hole

125: Opening

126: fan blade

132: Rotor

133: Stator

134: Assembly column

135: First Bearing

136: Second Bearing

141: Shaft extension direction

15: Grinding disc

151: Ontology

152: Assembly

16: Battery

17: Assembly shell

171: Tube body

172:Capping

173: Assembly

18: Operation panel

Claims (15)

An electric grinding tool machine, comprising a holding body, a grinding disc and a battery, the holding body is provided with a tool shaft connected to the grinding disc, a driving component that can make the tool shaft rotate when receiving electricity, and an electric A circuit board for connecting the drive assembly and the battery, the holding body has a battery mounting seat exposed on the outside, and the electric grinding tool is characterized in that: the board surface of the circuit board is not perpendicular to the tool axis, and the circuit board The battery mounting seat and the battery mounting seat are respectively located on two opposite sides of the tool shaft, the circuit board and the battery mounting seat are located on the same hypothetical axis, and the hypothetical axis is orthogonal to the extension direction of the shaft of the tool shaft. The electric grinding tool machine of claim 1, wherein the holding body is formed with a plurality of ventilation holes, and the ventilation holes form an air path passing through the circuit board. The electric grinding tool as claimed in claim 1, wherein a plurality of ventilation holes are formed on the grip body, and the ventilation holes form a first air path passing through the circuit board and a flow through the driving assembly not facing the circuit The second gas path on one side of the plate. The electric grinding tool according to any one of claims 1 to 3, wherein the drive assembly comprises a rotor connected to the tool shaft and a stator implemented in cooperation with the rotor. The electric abrasive tool machine of claim 4, wherein the electric abrasive tool machine includes an assembly housing provided in the grip body and provided with the drive assembly disposed therein, the assembly housing comprising a tube body and two separate Covers arranged on both sides of the tube body. The electric grinding tool according to any one of claims 1 to 3, wherein the tool shaft is provided with a counterweight and a fan blade that is assembled on the counterweight and rotates synchronously with the tool shaft. The electric grinding machine tool of claim 6, wherein the counterweight body has a first counterweight portion and a second counterweight portion arranged up and down, and the second counterweight portion is eccentric relative to the first counterweight portion , the fan blade is arranged on the second counterweight part. The electric grinding tool machine according to claim 7, wherein the holding body is formed with at least one opening facing the counterweight at one end close to the grinding disc. The electric abrasive tool as claimed in claim 6, wherein at least one opening facing the counterweight is formed at one end of the holding body close to the abrasive pad. The electric grinding tool as claimed in claim 9, wherein the holding body defines a side of the circuit board as a front side, and the electric grinding tool has a front side of the holding body and is electrically connected to the The operation panel of the circuit board. The electric grinding tool according to any one of claims 1 to 3, wherein the holding body has a receiving space on the inner wall surface facing the driving assembly and providing the circuit board. The electric grinding tool as claimed in claim 11, wherein a convex portion is formed on the outer surface of the holding body relative to the receiving space, and the convex portion provides a commercial mark and is disposed on it. The electric abrasive power tool according to any one of claims 1 to 3, wherein the battery mounting seat has an insertion opening, and a direction of the insertion opening is perpendicular to the tool axis. The electric abrasive power tool according to any one of claims 1 to 3, wherein the battery mounting seat has an insertion opening, and the insertion opening is parallel to the tool axis. The electric abrasive tool as claimed in any one of claims 1 to 3, wherein the holding body defines a side on which the circuit board is provided as a front side, and the electric abrasive tool has a front side disposed on the handle body and electrically connected to the operation panel of the circuit board.

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