Electric tool

Abstract

The utility model relates to a handheld electric tool, and belongs to the technical field of electric tools. The tool comprises a speed regulating and gear shifting device rotationally installed on a machine shell and a transmission device which is installed in the machine shell and can switch gears. The speed regulating and gear shifting device comprises a fixed cover fixed to the machine shell and a rotary knob rotationally installed on the fixed cover and exposed. The fixed cover is provided with at least two grooves which are distributed at intervals in the circumferential direction; the knob is provided with a boss which can be clamped with the grooves, and is provided with a first position which is elastically lifted and a second position which is pressed down and descended; when the knob is located at the first position, the boss is clamped into the groove, so that the knob cannot rotate; when the knob is at the second position, the boss is separated from the groove, so that the knob can rotate relative to the fixed cover. According to the speed regulation gear shifting device, locking operation can be achieved without adding extra parts, the structure is simple, unlocking is completed only by pressing the rotary knob to enable the boss to be separated from the groove of the fixing cover, follow-up gear shifting operation is facilitated, operation is convenient, and labor is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric tools, especially, a kind of hand-held electric tool speed regulating knob locking structure improvement, belong to electric tool technical field. BACKGROUND

[0002] In the electric tool operating process, for not to be used application scene, different speed gears need to be switched, i.e. the switching knob needs to be positioned at different gears. US Patent No. US15982802 discloses a selection knob retaining device, the selection knob is rotatably coupled to the housing of the electric tool. The knob can be rotated between a first position corresponding to a first indicator for selecting a first operating mode / operation of the tool at a first speed and a second position corresponding to a second indicator for selecting a second operating mode / operation of the tool at a second speed. A retaining device is installed in the knob, the retaining device includes a spring-loaded retaining button having a radially extending retaining flange distal to the knob and a compression spring proximal to the knob received within a channel in the knob. The retaining flange is movably received in a track defined by the housing, which can include a first locking groove corresponding to the rotational position of the knob to select the first operating mode and a second locking groove corresponding to the rotational position of the knob to select the second operating mode. In order to change the operating speed of the tool, the user can press the distal portion of the retaining button to release the locking button from the current locking groove, then rotate the knob and release the locking button to be retained in the desired locking groove or. The locking structure of the existing speed regulating knob structure is complex, and at the same time, it is inconvenient to apply force to select the knob under the force applied to the retaining device, and the operation is not convenient enough. SUMMARY

[0003] The utility model aims at: in view of the above-mentioned prior art existing defects, propose a kind of electric tool of simple structure, gear shifting easy, operation convenient speed regulating gear shifting device.

[0004] In order to achieve the above purpose, the basic technical scheme of the utility model electric tool is: including the speed regulating gear shifting device rotatably installed in the casing, and the transmission device installed in the casing interior can switch gear position;The speed regulating gear shifting device includes the fixed cover fixed on the casing, and the knob exposed rotatably installed in the fixed cover;The fixed cover has at least two circumferentially spaced recesses, the knob has the boss that can be engaged with the recess and has the first position of elastic lifting and the second position of depression down;When the knob is in the first position, the boss is engaged into the recess so that the knob cannot rotate;When the knob is in the second position, the boss is out of the recess so that the knob can rotate relative to the fixed cover.

[0005] The speed regulating gear shifting device of the utility model does not need to increase additional parts to realize locking operation, has simple structure, and only through pressing knob to make the boss separate from the groove of the fixed cover to complete unlocking, which is convenient for subsequent gear shifting operation, and is convenient and labor-saving to operate.

[0006] The utility model further improves that the speed regulating gear shifting device includes the elastic member that makes the boss of knob reset and is connected in the groove of fixed cover.

[0007] The utility model further improves that the speed regulating gear shifting device includes torsion spring, one end of torsion spring is connected with the knob, and the other end is connected with clutch component;The lower end of clutch component is equipped with an eccentric pin;Mode switching mechanism is connected with speed regulating gear shifting device through eccentric pin.

[0008] The utility model further improves that the speed regulating gear shifting device includes the sealing ring that is arranged between the fixed cover and the knob. ACCURACY OF DRAWINGS

[0009] The utility model will be further explained in connection with the drawings.

[0010] Figure 1 It is the whole machine structure schematic view of the utility model embodiment one.

[0011] Figure 2 It is Figure 1 It is the three-dimensional schematic view of part assembly of the speed regulating gear shifting device of the utility model embodiment.

[0012] Figure 3 It is Figure 2 It is the three-dimensional exploded structure schematic view of the fixed cover of the speed regulating gear shifting device of the utility model embodiment.

[0013] Figure 4 It is Figure 2 It is the three-dimensional exploded structure schematic view of the knob of the speed regulating gear shifting device of the utility model embodiment.

[0014] Figure 5 It is Figure 2 It is the sectional view of the speed regulating gear shifting device of the utility model embodiment in first position.

[0015] Figure 6 It is Figure 2 It is the sectional view of the speed regulating gear shifting device of the utility model embodiment in second position. CONCRETE IMPLEMENTING METHOD Embodiment one

[0016] The whole structure of the electric tool 1 of the embodiment is as shown in the figure. Figure 1As shown, it mainly includes a housing 2, a speed control and shifting device 3 rotatably mounted on the housing 2, and a transmission device (not shown) installed inside the housing that can switch gears. The speed control and shifting device 3 is used to adjust the mode switching mechanism. Users can switch modes according to different usage scenarios.

[0017] Reference Figure 2 As shown, the speed control shifting device 3 includes an annular fixing cover 31 fixed to the housing 2 by screws, and a knob 32 rotatably mounted on the fixing cover 31 and exposed thereon. The fixing cover 31 has at least two circumferentially spaced grooves 311 (e.g., ...). Figure 3 As shown), the knob 32 has a boss 321 that engages with the groove 311 (as shown). Figure 4 (As shown). The groove 311 engages with the boss 321 to achieve circumferential locking between the knob 32 and the fixed cover 31.

[0018] Based on this design, the knob 32 in this embodiment has a first position that is elastically raised (e.g., Figure 5 (as shown) and the second position after the pressure drops (as shown) Figure 6 (As shown). When knob 32 is in the position Figure 5 In the first position shown, the boss engages with the groove, preventing the knob from rotating; the locking operation is achieved by the engagement of the knob 32 with the fixed cover 31, resulting in a simple structure. The user lowers the knob 32 to... Figure 6 The second position shown allows the boss 321 to disengage from the groove 311 to unlock, and allows the knob 32 to rotate relative to the fixed cover, facilitating subsequent gear shifting operations. This makes the operation convenient and effortless.

[0019] The speed control and shifting device 3 also includes an elastic element 33 that can reset the protrusion 321 of the knob 32 into the groove of the fixed cover 31. The two pairs of grooves and protrusions shown in this embodiment correspond to two-speed mode switching. The number of grooves and protrusions is not limited to two pairs and can be adjusted according to the number of speeds for mode switching.

[0020] Reference Figure 2 As shown, the speed control and shifting device 3 in this embodiment also includes a torsion spring 34, one end of which abuts against the knob 32, and the other end of which abuts against the clutch component 35. The clutch component 35 has an eccentric pin 351 at its lower end, and the mode switching mechanism is connected to the speed control and shifting device through the eccentric pin 351. The speed control and shifting device 3 also includes a sealing ring 36 disposed between the fixed cover 31 and the knob 32 to prevent dust from entering the housing.

[0021] In addition to the embodiments described above, this utility model may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. An electric power tool, comprising a speed-adjusting gear rotatably mounted on a housing, and a transmission device mounted in the housing and capable of switching gears; the speed-adjusting gear comprises a ring-shaped fixed cover fixed on the housing, and a knob rotatably mounted on the fixed cover and exposed; characterized in that the fixed cover has at least two circumferentially spaced recesses; the knob has a protrusion capable of being engaged with the recesses, and has a first position elastically raised and a second position depressed; when the knob is in the first position, the protrusion is engaged with the recesses, so that the knob cannot rotate; when the knob is in the second position, the protrusion is disengaged from the recesses, so that the knob can rotate relative to the fixed cover.

2. The power tool of claim 1, wherein: The speed-adjusting gear comprises an elastic member for resetting the protrusion of the knob to be engaged with the recesses of the fixed cover.

3. The power tool of claim 2, wherein: The speed-adjusting gear comprises a torsion spring, one end of the torsion spring abutting against the knob, and the other end abutting against a clutch component; the clutch component has an eccentric pin arranged at a lower end thereof; a mode switching mechanism is connected with the speed-adjusting gear through the eccentric pin.

4. The power tool of claim 3, wherein: The speed-adjusting gear comprises a sealing ring arranged between the fixed cover and the knob.

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