TWI860691B - Power tools with motor directly connected to tool head - Google Patents

Abstract

A motor-directly-connected tool head electric tool comprises a body and a tool head detachably connected to the body, wherein the body has a slot and a motor is arranged in a floating manner inside the body, the motor has a drive shaft and a plug tube surrounding the drive shaft, the rear side of the tool head has an insert block for inserting into the slot, the insert block has a sleeve groove for the plug tube to be inserted and fixed, and the sleeve groove has a connector for connecting the drive shaft to drive the action part of the tool head to work; when the action part of the tool head of the present invention is subjected to force and the tool head is loosely offset relative to the body, since the motor is arranged in a floating manner and the plug tube is inserted into the sleeve groove of the tool head for fixing, the motor can move with the tool head, thereby avoiding the axial deviation of the drive shaft and the connector and maintaining the transmission efficiency and service life of the motor.

Description

Power tools with motor directly connected to tool head

The present invention relates to an electric tool, and more particularly to an electric tool with a motor directly connected to a tool head.

The existing power tool includes a tool head and a body. The tool head is detachably connected to the front end of the body. A motor is fixed in the body and connected to a connector at the rear end of the tool head by its drive shaft. When the power tool is used, the motor drives the working part at the front end of the tool head to rotate through the connector.

Although the above-mentioned electric tool has the effect of electrically driving the working part, since the tool head and the body are connected in a loose manner, when the working part of the tool head is subjected to lateral force, the tool head is easily offset relative to the body, causing the connector at the rear end of the tool head and the drive shaft of the motor to offset and generate friction. In addition to reducing the transmission efficiency of the motor, the connector of the tool head and the motor are also easily damaged due to friction, which reduces the service life.

In view of this, the purpose of the present invention is to provide an electric tool, by arranging the motor in a floating manner inside the body, and cooperating with the structural design that the tool head can be fixedly connected to the motor when inserted into the body, so that when the tool head is offset relative to the body, the transmission between the motor and the tool head is not affected by the offset of the tool head.

In order to achieve the above-mentioned purpose, the present invention provides an electric tool with a motor directly connected to a tool head, comprising a body and a tool head detachably connected to the body. The body has a body shell, the front end of the body shell has a joint, the joint has a slot, the front end of the slot has a socket, a control button is arranged on the body shell, a motor is arranged in the body shell in a manner that it can float at least in a circumferential direction, the motor is activated by the control button, the motor has a drive shaft extending in the direction of the socket, and the motor is also provided with a plug surrounding the drive shaft. The tool head has a tool head shell, a plug block is protruding backwards at the rear end of the tool head shell, the inside of the plug block has a sleeve groove opening toward the rear, the plug block is inserted into the slot through the socket, the plug tube of the motor is inserted into the sleeve groove and fixed, a connector is inserted into the tool head shell, the connector is located in the sleeve groove and connected to the drive shaft, an action part is set at the front end or around the tool head shell, the action part is connected to the front end of the connector and is driven by it to operate.

The effect of the present invention is that, since the motor is arranged in the body in a manner that it can float at least in the circumferential direction, and the plug of the motor is inserted into the sleeve groove at the rear end of the tool head for fixing, the motor and the tool head can be connected as a whole when they are detachably combined. When the working part of the tool head is subjected to force, causing the tool head to loosen and deviate relative to the body, the motor can move with the tool head, thereby avoiding the axis of the drive shaft from deviating relative to the axis of the connector, maintaining the transmission efficiency of the motor driving the working part, and extending the service life of the connector and the drive shaft for transmission between the tool head and the motor.

In order to more clearly explain the present invention, a preferred embodiment is given and described in detail with reference to the drawings. Please refer to FIG. 1 to FIG. 6, which are a preferred embodiment of the present invention, a motor directly connected to a tool head electric tool 100, comprising a body 10 and a tool head 20 detachably coupled to the body 10, the body 10 can be a gun-shaped or rod-shaped body, the tool head 20 can be a hexagonal wrench head, a screwdriver head or a round saw head, in the preferred embodiment, the body 10 is a rod-shaped body, the tool head 20 is a hexagonal wrench head, wherein:

The body 10 has a body shell 12. The body shell 12 is a rod-shaped shell formed by combining left and right half shells and has front and rear ends. The front end of the body shell 12 has a joint 121. The joint 121 has a slot 122. The front end of the slot 122 has a socket 123. The socket 123 is located at the front of the body shell 12. A control button 14 is set on the body shell 12. A motor 16 is provided in a manner that can at least float in the circumferential direction. The motor 16 is electrically connected to the control button 14 and can be activated by the control button 14. The motor 16 has a motor body 161. A transmission shaft 162 is provided at the center of the front of the motor body 161. The transmission shaft 162 extends toward the direction of the socket 123. A plug 163 is provided at the front of the motor body 161. The plug 163 is a straight tube and surrounds the plug 163. In the preferred embodiment, the transmission shaft 162 is entirely located in the plug 163. In other preferred embodiments, the fuselage shell 12 can also be a rod-shaped shell formed by combining upper and lower half shells.

The tool head 20 has a tool head housing 22, and a plug block 24 is protruded backward at the rear end of the tool head housing 22. The inside of the plug block 24 has a sleeve groove 241 opened toward the rear. The plug block 24 is inserted into the slot 122 through the socket 123, and the plug tube 163 of the motor 16 is inserted into the sleeve groove 241 and fixed. When the plug tube 163 is inserted into the sleeve groove 241, the outer peripheral surface of the plug tube 163 is fixed against the inner wall of the sleeve groove 241, so that the tool head 20 and the motor 16 can move together within the floating and movable range of the motor 16 in the body housing 12. A connector 26 is pivoted in the tool head housing 22. The connector 26 is located in the sleeve groove 241 and connected to the drive shaft 162 of the motor 16. An action portion 28 is provided at the front end or around the tool head housing 22. The action portion 28 is connected to the front end of the connector 26 and is driven by the connector 26. In the preferred embodiment, the action portion 28 is a hexagonal wrench provided at the front end of the tool head housing 22; in other preferred embodiments, the action portion 28 may also be a screwdriver or a round saw assembly provided around the tool head housing 22.

When the present invention is used, as in the preferred embodiment described above, the body 10 is held by the user, and when the user presses the control button 14, the drive shaft 162 of the motor 16 is activated to rotate, and the action portion 28 of the tool head 20 is driven to operate via the connector 26 connected to the drive shaft 162. Since the tool head 20 is detachably coupled to the body 10, the tool head 20 of the original hexagonal wrench head can be replaced with a screwdriver head, a round saw head, or other types of tool heads 20.

Because the tool head 20 is replaceable, a loose gap is easily generated between the tool head 20 and the body 10 when the tool head 20 is combined with the body 10. When the action portion 28 of the tool head 20 exerts force on the object, the reaction force may cause the tool head 20 to loosen and deviate relative to the body 10. However, in the present invention, since the motor 16 is floatingly arranged in the body 10 and the insertion tube 16 of the motor 16 3 is inserted into the sleeve groove 241 at the rear end of the tool head 20 and fixed as a whole, so that when the tool head 20 is loosely offset relative to the body 10, the motor 16 can move with the tool head 20, avoiding the axis of the transmission shaft 162 from being offset relative to the axis of the connector 26, and maintaining the transmission efficiency of the motor 16 driving the action part 28 and the service life of the transmission structure between the tool head 20 and the motor 16.

Please refer to Figures 1 to 4B for further explanation of other parts of the preferred embodiment. The body shell 12 is a cylindrical rod-shaped shell and has a side slot 124 at the left and right positions adjacent to the slot 122. The two side slots 124 are symmetrically arranged, and each side slot 124 has a side socket 1241 on the side facing the other side slot 124. In accordance with the positions of the two lateral slots 124, a floating arm 164 is provided on the left and right sides of the motor body 161 of the motor 16. Each of the floating arms 164 is inserted into each of the lateral slots 124 through each of the lateral sockets 1241. The outer end, top edge and bottom edge of each of the floating arms 164 and the inner wall of each of the lateral slots 124 have a floating gap A. By allowing the two floating arms 164 to at least move up, down, left and right in the two lateral slots 124, the motor 16 is disposed in the outer shell of the fuselage shell 12 in a manner that it can float in the circumferential direction at least. In other preferred embodiments, the floating gap A also extends between the front and rear surfaces of each floating arm 164 and the inner wall of each lateral slot 124, so that when the axis direction of the motor 16 is slightly deflected relative to the axis direction of the body shell 12, the axis of the transmission shaft 162 will not be offset relative to the axis of the connector 26.

The front and rear parts of the insert block 24 of the tool head 20 are respectively divided into a front section 242 with a wider outer diameter and a rear section 243 with a narrower outer diameter. The outer diameter of the front section 242 is smaller than the outer diameter of the tool head housing 22. The sleeve groove 241 is located in the rear section 243 so that the rear section 243 becomes an annular tube, and an annular guiding slope 2431 is formed at the inner edge of the rear end of the rear section 243. The inner wall of the slot 122 of the body 10 is non-circular, and the contour around the front section 242 matches the shape of the inner wall of the slot 122, so that after the front section 242 is inserted into the slot 122, the tool head 20 cannot rotate relative to the body 10 with its axis as the rotation center.

In the preferred embodiment, the rear section 243 is an annular circular tube and has a barb 244 on one side of its outer circumference. Specifically, the barb 244 is connected to the top side of the rear end edge of the outer circumference of the rear section 243, and the rear side of the barb 244 has an inclined surface 2441. A buckle ring 21 is provided in the body shell 12 to cooperate with the barb 244. The buckle ring 21 is a circular ring and is located around the insert tube 163. In the preferred embodiment, the front end of the insert tube 163 extends out of the front edge of the buckle ring 21. There is an annular insertion gap A1 between the inner circumference of the buckle ring 21 and the outer circumference of the insert tube 163, and the rear section 243 of the tool head 20 can be inserted. The radial length of the insertion gap A1 corresponding to the top side of the body shell 12 is smaller than the radial length of other parts. One side of the body shell 12 is penetrated by a buckle button hole 125 at the bottom side of the body shell 12 in the preferred embodiment, and a spring seat 126 is formed in the other side of the body shell 12, that is, the top side.

Please refer to Figures 2 to 4B. A buckle ring button 211 is inserted into the buckle ring button hole 125. The inner end of the buckle ring button hole 125 is connected to the bottom side of the buckle ring 21. The spring seat 126 is provided with a spring 212. The spring 212 applies force against the top side of the buckle ring 21, so that the buckle ring 21 maintains a smaller radial length of the top side of the insertion gap A1, and when the buckle ring button 211 is pressed, the buckle ring 21 can move to a release position and reset after the buckle ring button 211 is released.

Please refer to Figures 2 and 6. When the front section 242 of the tool head 20 is inserted into the slot 122 of the body 10 and the rear section 243 is sleeved around the insert tube 163 of the motor 16, the guide slope 2431 is used for the front end of the insert tube 163 to abut against so that the insert tube 163 is smoothly inserted into the sleeve groove 241 for fixation. At the same time, the inclined surface 2441 of the barb 244 pushes the buckle ring 21 away, so that when the insert tube 163 is inserted into the sleeve groove 241 for fixation, the buckle ring 21 buckles the barb 244, and the tool head 20 is detachably coupled to the front end of the body 10.

The above description is only the preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the scope of patent application should be included in the patent scope of the present invention.

[The present invention] 100: Electric tool with motor directly connected to tool head 10: Machine body 12: Machine body housing 121: Joint 122: Slot 123: Socket 124: Lateral slot 1241: Lateral socket 125: Retaining ring button hole 126: Spring seat 14: Control button 16: Motor 161: Motor body 162: Drive shaft 163: Insert tube 164: Floating arm 20: Tool head 21: Retaining ring 211: Retaining ring button 212: Spring 22: Tool head housing 24: Insert block 241: Slot 242: Front section 243: Rear section 2431: Guide slope 244: Hook 2441: Inclined surface 26: Connector 28: Action section A: Floating gap A1: Insertion gap

Figure 1 is a three-dimensional diagram of a preferred embodiment of the present invention. Figure 2 is a side view schematic diagram of the head and the body of the preferred embodiment of the present invention separated. Figure 3 is a rear view of the head of the preferred embodiment of the present invention. Figure 4A is a front view of the body of the preferred embodiment of the present invention. Figure 4B is a front view schematic diagram of Figure 4A with a portion of the body shell cut away. Figure 5 is a side view of the preferred embodiment of the present invention. Figure 6 is a schematic cross-sectional view of Figure 5 in the direction 6-6.

100: Electric tool with motor directly connected to tool head 10: Machine body 12: Machine body housing 121: Joint 14: Control button 20: Tool head 22: Tool head housing 28: Action part

Claims (6)

An electric tool with a motor directly connected to a tool head, comprising: a body, having a body shell, the front end of the body shell having a connection portion, the connection portion having a slot, the front end of the slot having a socket, a control button provided on the body shell, a motor provided in the body shell in a manner that can float at least in a circumferential direction, the motor is activated by the control button, the motor has a drive shaft extending in the direction of the socket, and the motor is provided with a plug surrounding the drive shaft; and A tool head detachably combined with the body has a tool head housing, a plug block is protruding backwards at the rear end of the tool head housing, the inside of the plug block has a sleeve groove opening toward the rear, the plug block is inserted into the slot through the socket, the plug tube of the motor is inserted into the sleeve groove and fixed, a connector is inserted into the tool head housing, the connector is located in the sleeve groove and connected to the drive shaft, an action part is set at the front end or around the tool head housing, the action part is connected to the front end of the connector and driven by it to operate. An electric tool with a motor directly connected to a tool head as described in claim 1, wherein the left and right positions in the body shell are respectively provided with a lateral slot, the two lateral slots are symmetrical on the left and right sides and a lateral socket is provided on the side of each lateral slot facing the other lateral slot; the left and right sides of the motor are provided with a floating arm, each of the floating arms is inserted into each of the lateral slots through each of the lateral sockets, and the outer end, top edge and bottom edge of each of the floating arms and the inner wall of each of the floating arms have a floating gap, so that the motor is arranged in the body shell in a manner that it can float at least in the circumferential direction. An electric tool with a motor directly connected to a tool head as described in claim 1, wherein the front and rear parts of the plug are each divided into a front section with a wider outer diameter and a rear section with a narrower outer diameter, the sleeve groove is located in the rear section to make the rear section an annular tube; the inner wall of the slot is non-circular, and the contour around the front section matches the shape of the inner wall of the slot. The electric tool with a motor directly connected to the tool head as described in claim 3, wherein a barb is provided on one side of the outer peripheral surface of the rear section, and the rear side of the barb has an inclined surface; a buckle ring is provided in the body shell to cooperate with the barb, and the buckle ring is located around the insert tube, and there is an annular insertion gap between the inner peripheral surface of the buckle ring and the outer peripheral surface of the insert tube; a buckle ring button hole is penetrated through one side of the body shell, and a buckle ring button is penetrated through the buckle ring button hole, and the buckle ring The inner end of the ring button is connected to one side of the buckle ring, and a spring seat is formed in the other side of the body shell. The spring seat is provided with a spring. The spring applies force against the other side of the buckle ring, so that when the buckle ring button is pressed, the buckle ring can move to a release position and return to its original position after release; the insertion gap is used for the rear section to be inserted, and the barb pushes the buckle ring away during the insertion of the rear section into the insertion gap, and the buckle ring buckles the barb when the insertion tube is inserted into the sleeve groove and fixed. As described in claim 4, an electric tool with a motor directly connected to a tool head has an annular guiding slope formed on the inner edge of the rear end of the rear section, and the front end of the insert tube abuts against the guiding slope to guide the insert tube to be inserted into the sleeve groove and fixed. An electric tool with a motor directly connected to a tool head as described in any one of claims 1 to 5, wherein the active part is a hexagonal wrench, a screwdriver or a round saw assembly.

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