WO2014000345A1

WO2014000345A1 - Electric angle grinder

Info

Publication number: WO2014000345A1
Application number: PCT/CN2012/081911
Authority: WO
Inventors: 张淼; 刘贵仁
Original assignee: 上海锐奇工具股份有限公司
Priority date: 2012-06-29
Filing date: 2012-09-25
Publication date: 2014-01-03
Also published as: CN102765033B; CN102765033A

Abstract

An electric angle grinder having an open-and-locked in feature, comprising a housing (6), an operating rod (4), and a dial (1). The operating rod (4) is connected at both ends thereof to a housing (6) and is for use in operating a switch part (5) of the electric angle grinder. A gap for installing the dial (1) is formed on the operating rod (4), while the dial (1) is arranged within the gap. A rotary pin (3) is arranged on the dial (1). A portion of the dial (1) is exposed outside of the operating rod (4), while the remaining portion of the dial (1) is arranged within the housing (6). The portion of the dial (1) arranged within the housing (6) is connected to an extension rod (1a). A protruding block (1b) is arranged on one side of the extension rod (1a), while an engaging part (1c) is arranged on the end at the other side of the extension rod (1a). A support block (4a) is arranged on the inside of the operating rod (4). An extension column (6a) is arranged on the edge of the side of the dial (1) where the engaging part is arranged. An indented part (6a-1) is arranged at an end of the extension column (6a). When the dial (1) is in a closed-and-locked up state, the protruding block (1b) presses onto the support block; when the dial (1) is in an open-and-locked in state, the engaging part (1c) engages onto the indented part (6a-1). The present invention allows for reduced occurrence of misoperation, for reduced operation burden, and for increased operation efficiency.

Description

Electric angle grinder

Technical field

The present invention relates to an electric angle grinder for grinding or grinding a workpiece. Background technique

A conventional electric angle grinder generally includes a housing having a working member for grinding or grinding a workpiece at a head portion of the housing, and a drive for driving the working member at a central portion of the housing. The motor is provided with a switch member for switching the energization state and the power-off state of the drive motor in the grip portion of the housing, and an operation lever is disposed below the switch member, and the operator operates the switch located in the housing through the operation lever component. When the drive motor is energized, the grinding wheel of the working part will rotate at a very high speed. Once the operator is not working properly, or the operator is unfamiliar with the tool, the high-speed rotating grinding wheel can easily cause damage to the human body. In order to prevent erroneous operation to the utmost extent, a locking member is usually provided on the operating lever attachment.

For example, PCT Patent No. PCT/JP2009/065295, entitled "Working Tools", discloses an electric angle grinder having a drive motor for driving a grinding or grinding operation on a workpiece. a motor casing that houses the above-described drive motor; a rear cover that is mounted on a rear end region of the motor casing on the opposite side of the grinding wheel mounting portion, and that constitutes a handle portion for the operator to grasp by the motor casing; The operator performs a gripping operation by hand, which is elongated and mounted on both the motor casing and the rear cover; the switch portion has a weight in the rear cover, and the switch portion passes through the opening The portion is connected to the operating lever, and an action is generated by the operation of the operating lever to perform energization control of the above-described driving motor.

In the above patent, in order to prevent the occurrence of erroneous operation, a lock member is provided on the operating lever, and the lock member includes a rotating shaft, a engaging portion, and an operating portion. The principle of the locking is: when in the locked state, the engaging portion is engaged with the convex portion on the operating rod by the elastic action exerted by the spring, and at this time, the operator cannot operate the operating lever; When one hand of the person rotates the locking member through the operating portion, if the force applied by the operator exceeds the elastic force of the spring, the engaging portion of the locking member gradually leaves the convex portion until completely separated, at this time, the operator Need to use the other hand, press the lever up to close the switch part above the operating lever, drive the motor to work, and the grinding wheel starts grinding or grinding. However, during the operation, the operator needs to press the operating lever all the time, otherwise the engaging portion will re-engage on the convex portion due to the spring restoring force, so that the driving motor stops working.

From this, it can be seen that although the above-described locking member can prevent erroneous operation, it additionally increases the operational burden of the operator, reduces the work efficiency of the work, and may cause the drive motor to be erroneously stopped. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric angle grinder which reduces the operational burden of an operator and improves the operation efficiency of the operator.

In order to achieve the above object, the technical solution of the present invention provides an electric angle grinder, comprising a housing, and a working component for grinding or grinding a workpiece on a working end of the housing, the working component is provided Driven by the driving motor of the housing, a switch component is arranged in the grip end of the housing, and the drive motor is switched to the energized state or the power-off state by the switch component, and an operating lever is provided below the switch component, and the operating lever is The two ends are respectively connected to the housing, and a gap for installing a knob is formed on the operating rod, the knob is located in the gap, and a rotating pin is disposed on the knob, and the two ends of the rotating pin are respectively connected to the operating rod, and the rotating pin outer sleeve is twisted a portion of the knob that is exposed outside the operating rod is an operating portion, and is characterized in that: a bump is provided on one side of the portion of the knob in the housing, and a locking portion is provided on the other end portion of the knob. The inner side of the rod is provided with a support block that cooperates with the protrusion, and an extension column is arranged on a side of the knob on the side where the engaging portion is provided, and the extension column is connected with the housing, and the end portion of the extension column is provided with the engaging portion. The mating recesses, when the knob is in the closed lock state, the bumps are pressed against the support block by the torsion spring, and when the knob is in the open lock state, the engaging portion is engaged with the recessed portion.

Preferably, a guide portion is disposed on an end of the portion of the knob that is located on the opposite side of the portion of the housing from the engaging portion, and a guide post is disposed on a side of the knob on a side where the guide portion is provided. When the knob is in the closed lock state, the guide rests on the end of the guide post.

Preferably, the working component comprises a grinding wheel, and a protective cover fixing device is arranged outside the grinding wheel, and the driving motor drives the grinding wheel to rotate by a driving motor, wherein:

The protective cover fixing device comprises a cover body covering the outer surface of the grinding wheel and a front cover attached to the outer casing, and a hoop extending outwardly on a side surface of the cover body facing away from the grinding wheel, and at least a inner side of the hoop is provided a boss having at least one card slot at the top of the front cover, the number of the card slots is equivalent to the number of the bosses, and an annular groove is formed on the outer circumferential surface of the front cover, and the boss of the hoop is embedded through the card slot In the annular groove, the rest of the wrench is located between the hoop and the front cover, and the retaining groove is formed on the hoop, and the gear is placed on the portion between the hoop and the front cover. The teeth, the gear teeth are stuck in the gear groove.

In the electric angle grinder provided by the invention, the state lock of the electric angle grinder is realized by a simple structure, thereby avoiding the occurrence of misoperation to the greatest extent, and at the same time, after the electric angle grinder is opened, When the state is locked, the operator does not need to press the operating lever frequently during the operation, which reduces the work load, improves the work efficiency, and avoids the occurrence of the drive motor being erroneously stopped. DRAWINGS

1A is a partial cross-sectional view showing an electric angle grinder in a closed lock state in the embodiment; FIG. 1B is a partial enlarged view of FIG. 1A;

Figure 2 is a partial cross-sectional view showing the electric angle grinder of the embodiment of the present embodiment after rotating the knob counterclockwise; Figure 3 is a partial cross-sectional view of the electric angle grinder of the embodiment after the operating lever is pressed; Figure 4 is a partial cross-sectional view of the electric angle grinder in the open state of the present embodiment; Figure 5A is an exploded view of the shield fixing device provided by the present invention;

Figure 5B is an assembled view of the protective cover fixing device provided by the present invention;

6A is a schematic view showing the installation of the protective cover fixing device provided by the present invention;

Figure 6B is a protective cover provided with a hoop provided by the utility model;

Figure 6C is a front cover of the protective cover fixing device provided by the present invention;

7A is a schematic view showing the fixing of the protective cover fixing device provided by the present invention:

Figure 7B is a plan view of Figure 7A provided by the present invention;

7C is a schematic view showing the working angle of the adjusting cover of the protective cover fixing device provided by the present invention; FIG. 7D is a top view of FIG. 7C provided by the utility model:

Figure 8 is a schematic view showing the disassembly of the shield fixing device provided by the present invention. detailed description

In order to make the present invention more apparent, the preferred embodiments are described in detail with reference to the accompanying drawings.

As shown in Figs. 1A and 1B, an electric angle grinder provided by the present invention includes a casing 6, and a working member 7 for grinding or grinding a workpiece is provided on a working end of the casing 6. In the drawings provided in this embodiment, the working member Ί is located on the left side. The working member 7 is driven by a drive motor provided in the casing 6. A switch member 5 is provided in the grip end of the housing 6. In the drawings provided in this embodiment, the grip end is located on the right side. The drive motor is switched to the energized state or the power-off state by the switch member 5. When the drive motor is energized, the working member 7 starts grinding or grinding, and when the drive motor is in the power-off state, the working member 7 stops grinding or grinding. An operating lever 4 is provided below the switch member 5, and the operating lever 4 is a strip-shaped member, and the two ends are respectively connected to the housing 6. The operator switches the drive motor to the energized state by pressing the operating lever 4, and when the operating lever 4 is released, the switch member 5 switches the drive motor to the power-off state. A gap for mounting the knob 1 is formed on the operating lever 4, and the knob 1 is located in the gap. A rotating pin 3 is inserted into the middle of the knob 1, and both ends of the rotating pin 3 are respectively inserted into the operating rod 4 so that the knob 1 can be Rotate around the rotating pin 3. A torsion spring 2 is jacketed on the rotating pin 3. The portion of the knob 1 exposed outside the operation lever 4 is the operation portion 1a, and the operator rotates the rotation pin 3 by pulling the operation portion 1a. In the present embodiment, a bump lb is formed to extend outwardly on the right side of the portion of the knob 1 in the housing 6, and an engaging portion lc is formed on the left end portion thereof. In this embodiment, The engaging portion lc has a hook shape, and a guide portion ld is formed at an end portion on the right side thereof. In the present embodiment, the guide portion Id is an L-shaped guide groove. An upwardly extending inner side of the operating lever 4 forms a support block 4a that cooperates with the projection lb. An extension post 6a is provided on the left side of the knob 1, and the extension post 6a is connected to the housing 6, and the end of the extension post 6a is a recessed portion 6a-1 that cooperates with the engaging portion lc. A guide post 6b is provided on the right side of the knob 1.

As shown in Figs. 5A and 5B, the shield fixing device 13 includes a cover 13-1 which is housed outside the grinding wheel 14, and a front cover 13-6 which is connected to the casing 10. A hoop 2 is formed outwardly on an end surface of the cover body 13-1 facing away from the grinding wheel 14, and a boss e, a boss e2, a boss e3, a boss e4, and a convex are provided on the inner side of the hoop 13-2. The table e5 has a card slot gl, a card slot g2, a card slot g3, a card slot g4, and a card slot g5 at the top of the front cover 6, and the card slot cooperates with the boss. An annular groove 13-f is formed on the outer circumferential surface of the hoop 13-2, and the annular groove 13-f is also engaged with the boss. The wrench of the wrench 13-5 is disposed outside, and the remaining portion passes through the upper fixing plate. 13-3 and the screw 13-4 are provided between the hoop 13-2 and the front cover 13-6. A gear slot 13-b is opened on the hoop 13-2, the gear teeth 13-a are disposed on the wrench 13-5, and the gear teeth 13-a are caught in the gear slot 13-b, and the wrench 13- 5 is provided with a magazine 7 between the outer circumferential surface of the front cover 13-6. The cover 13-1 is welded to the hoop 13-2 as a whole 13-8.

As shown in Fig. 6A to Fig. 6C, when installing the protective cover: Press the wrench 13-5, and the boss el, the boss e2, the boss e3, the boss e4, and the boss e5 on the hoop 13-2 are respectively quasi front lid corresponding slot 13-6 gl, slot g2, slot g3, slot _g 4, slot _g 5, the shield sleeve into the front cover 13-6. Rotating the shield so that the boss on the hoop 13-2 fits into the annular groove 13-f of the front cover 13-6, rotates to the position desired by the user, and simultaneously loosens the wrench 13-5, and causes the wrench 13 The gear teeth 13-a on the -5 catch the gear slots 13-b on the hoop 2, and function as a rotation stop to realize the installation of the wheel guard.

As shown in FIG. 7A to FIG. 7D, when the working angle of the shield is fixed and adjusted: the wrench 13-5 is pressed along the slot 13-c in the front cover 13-6 and the upper fixing plate 13-3 (Note: the upper fixing plate 13-3 is fixed in the sliding groove formed by the screw 13-4 on the front cover 13-6, and the gear teeth 13-a of the wrench 13-5 are separated from the gear slots 13-b of the hoop 13-2. After opening (see tl), you can rotate the protective cover, adjust the angle of the protective cover according to the working requirements, and release the wrench 13-5 when it is in position. Under the elastic force of the spring 13-7, the gear teeth 13-a are stuck to the gear. In the slot 13-b (see t2), it acts to position and prevent the shield from rotating.

As shown in Fig. 8, when the protective cover is removed: as long as the wrench 13-5 is pressed and the protective cover 13-1 is rotated to a position corresponding to the front cover 13-6, the wheel guard 13-1 can be taken out, Release the wrench 13-5 at the same time. As shown in FIG. 1, when the knob 1 is in the closed lock state, the bump lb is pressed against the support block 4a by the torsion spring 2, and the guide portion Id is resting on the end of the guide post 6b. The operator cannot press the operating lever 4.

As shown in FIG. 2, when the operator needs to start the electric angle grinder, the operator rotates the knob 1 counterclockwise in the direction of the arrow shown in FIG. 2 through the operation portion la, at this time, the bump lb leaves the support block 4a, and The guide portion Id is separated from the end of the guide post 6b. Next, as shown in Fig. 3, after the operator presses the operating lever 4 in the direction of the arrow shown in Fig. 3, the knob 1 is moved up entirely by the operating lever 4. As shown in FIG. 4, after the guiding portion Id is located above the recessed portion 6a-1, the operator then rotates the knob 1 counterclockwise in the direction shown in FIG. 4 through the operating portion la, and then presses the hand of the operating lever 4 After the opening, the guide portion Id is firmly caught on the recessed portion 6a-1 by the torsion spring 2, and at this time, the knob 1 is in the open-lock state.

Claims

Rights request:

An electric angle grinder comprising a housing (6), on the working end of the housing (6), a working component (7) for grinding or grinding the workpiece, the working component (7) being provided The drive motor provided in the housing (6) is driven to operate in the housing

(6) a switch member (5) is provided in the grip end, and the drive motor is switched to a power-on state or a power-off state by the switch member (5), and an operation lever (4) is disposed below the switch member (5). The two ends of the operating lever (4) are respectively connected to the housing (6), and a gap for mounting the knob (1) is formed on the operating lever (4), and the knob (1) is located in the gap and is worn on the knob (1). There is a rotating pin (3), the two ends of the rotating pin (3) are respectively connected to the operating rod (4), and the rotating pin (3) is provided with a torsion spring (2), and the knob (1) is exposed outside the operating rod (4) The portion is the operation portion (1a), characterized in that: a bump (lb) is provided on one side of a portion of the knob (1) located in the casing (6), and a card is provided on the other end portion thereof. a joint portion (lc) having a support block (4a) fitted to the projection (lb) on the inner side of the operating rod (4) and a engaging portion at the knob (1)

The side of the (lc) side is provided with an extension column (6a), and the extension column (6a) is connected to the casing (6), and the end portion of the extension column (6a) is provided with the engaging portion (lc). The recess (6a-l), when the knob (1) is in the closed lock state, the bump (lb) is pressed against the support block (4a) by the torsion spring (2), when the knob (1) is open In the locked state, the engaging portion (lc) is engaged with the recessed portion (6a-1).

2. An electric angle grinder according to claim 1, wherein: a portion of said knob (1) located in said housing (6) opposite said engaging portion (lc) a guide portion (ld) is provided on the end portion, and a guide post (6b) is disposed on a side of the knob (1) on which the guide portion (Id) is provided, when the knob (1) is closed and locked In the state, the guide (Id) rests on the end of the guide post (6b).

3. An electric angle grinder according to claim 1, wherein said working member (11) comprises a grinding wheel (14), and a protective cover fixing device (13) is provided outside the grinding wheel (14). The drive motor drives the grinding wheel (14) to rotate by a drive motor, wherein:

The shield fixing device (13) includes a cover body (13-1) that is disposed outside the grinding wheel (14) and a front cover (13-6) attached to the housing (10), in the cover body (13-1) a back hoop (13) extending outwardly to form a hoop (13-2), and at least one boss on the inner side of the hoop (13-2), at the front cover (13-6) The top is provided with at least one card slot, the number of the card slots is equivalent to the number of the bosses, and an annular groove (13-f) is formed on the outer circumferential surface of the front cover (13-6), the hoop

The boss of (13-2) is inserted into the annular groove (13-f) through the card slot, and the yoke of the wrench (13-5) is located outside the rest of the hoop (13-2) and the front cover (13- 6) Between the hoop (13-2), there is a gear slot (13-b), on the wrench

(13-5) A gear tooth (13-a) is provided on a portion between the hoop (13-2) and the front cover (13-6), and the gear teeth (13-a) are caught in the gear slot. (13-b).

Figure IB

Figure 4

3/8

Figure 5A

4/8

Figure 6A

5/8

Figure 6C a map

8/9

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7/8

Figure 7D