A speed control switch assembly for an impact drill

Abstract

This utility model relates to the field of impact drill technology, specifically to a speed adjustment switch assembly for an impact drill. The assembly includes an impact drill body and a gear shift fork. A panel compression spring is mounted on one side of the impact drill body, and a gear adjustment knob is rotatably mounted on the same side. By using components such as screws, spring washers, gear shift forks, cylindrical pin one, O-rings, cylindrical pin two, knob washers, knob push pins, compression springs, gear adjustment knobs, output shafts, spur gear one, flat keys, sliding gears, spur gear two, and a clutch assembly, this invention effectively solves the problem that existing impact drills typically have rotary switches on their outer casings for adjusting drill bit speed. These rotary switches often lack limit settings, leading to accidental activation and arbitrary rotation. This results in the drill bit speed changing arbitrarily even when the impact drill is idle, increasing the risk of accidents.

Description

Technical Field

[0001] This utility model relates to the field of impact drilling technology, specifically to a speed adjustment switch assembly for an impact drill. Background Technology

[0002] An impact drill is an electric tool that primarily uses rotary cutting, but also incorporates an impact mechanism that relies on the operator's thrust to generate impact force. It is used for drilling holes in materials such as bricks, blocks, and lightweight walls.

[0003] Existing impact drills all have a switch installed on their outer casing to adjust the drill bit speed. These switches are all rotary. In actual use, the rotary switches do not have limit settings, which can lead to accidental activation. This causes the rotary switches to rotate arbitrarily, resulting in the drill bit speed changing randomly when the impact drill is not in use, which increases the risk of accidents. Therefore, corresponding improvements are needed to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a speed adjustment switch assembly for an impact drill to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a speed adjustment switch assembly for an impact drill, comprising an impact drill body and a gear shift fork. A mounting panel compression spring is installed on one side of the impact drill body, and a gear adjustment knob is rotatably mounted on the side of the mounting panel compression spring. The gear shift fork is installed on one side of the gear adjustment knob via a cylindrical pin and a screw, and a spring washer is movably fitted between the screw and the gear shift fork. One side of the gear shift fork is installed on a knob washer via two sets of cylindrical pins, and one side of the knob washer is aligned with the inner side of the gear adjustment knob. A mounting panel compression spring is installed inside the gear adjustment knob, and a knob push pin is installed at the top of the mounting panel compression spring.

[0006] Preferably, one end of the gear adjustment knob has an annular groove, and an O-ring is fitted inside the annular groove.

[0007] Preferably, the knob pad has two sets of through holes inside, and one end of each of the two sets of cylindrical pins passes through the corresponding through holes into the inside of the knob pad.

[0008] Preferably, the output end of the impact drill body is connected to an output shaft, and a spur gear one and a spur gear two are respectively fitted on the outer surface of the output shaft at both ends. A sliding tooth is installed on the outer surface of the output shaft at one end via a flat key. A clutch assembly is connected to the outer surface of the output shaft by meshing with the spur gear one and the spur gear two.

[0009] Preferably, the clutch assembly includes a three-tooth linkage, and a disc spring is installed at one end of the outer surface of the three-tooth linkage via a nut. A helical gear is installed at one end of the outer surface of the three-tooth linkage, and three sets of gears are fixedly sleeved on the outer surface of the three-tooth linkage.

[0010] Preferably, a waist-shaped washer is fitted on the outer surface of the triple gear near the lower part of the disc spring, and copper friction plates are provided at the positions between the bottom end of the waist-shaped washer and the top end of the helical gear, and between the bottom end of the helical gear and the top surface of a set of gears of the triple gear, and the copper friction plates are all fitted on the outer surface of the triple gear.

[0011] Preferably, the knob washer is fitted onto the outer surface of one end of the gear adjustment knob.

[0012] Compared with the prior art, the beneficial effects of this utility model are: By incorporating components such as screws, spring washers, shift forks, cylindrical pin one, O-rings, cylindrical pin two, knob washers, knob push pins, compression springs, shift knobs, output shafts, spur gear one, flat keys, sliding gears, spur gear two, and clutch components, this design effectively solves the problem that existing impact drills typically have rotary switches on their housings for adjusting drill bit speed. These rotary switches often lack limit settings, leading to accidental activation and uncontrolled rotation. This results in arbitrary changes to the drill bit speed even when the drill is idle, increasing the risk of accidents. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the main body of this utility model.

[0014] Figure 2 This is an exploded view of the gear adjustment knob of this utility model.

[0015] Figure 3 This is a three-dimensional structural diagram of the gear adjustment knob of this utility model.

[0016] Figure 4 This is a cross-sectional structural diagram of the output shaft of this utility model.

[0017] Figure 5 This is a schematic diagram of the gear shift fork of this utility model.

[0018] Figure 6 This is a three-dimensional structural diagram of the sliding teeth of this utility model.

[0019] Figure 7 This is a schematic diagram of the clutch assembly of this utility model.

[0020] In the diagram: 1. Impact drill body; 10. Mounting panel; 2. Screw; 3. Spring washer; 4. Gear shift fork; 5. Cylindrical pin one; 6. O-ring; 7. Cylindrical pin two; 8. Knob flat washer; 9. Knob push pin; 10. Compression spring; 11. Gear adjustment knob; 12. Output shaft; 13. Spur gear one; 14. Flat key; 15. Sliding gear; 16. Spur gear two; 17. Clutch assembly; 18. Nut; 19. Disc spring; 20. Waist-shaped washer; 21. Helical gear; 22. Triple gear; 23. Copper friction plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] according to Figures 1-7As shown, the device includes an impact drill body 1 and a gear shift fork 4. A mounting panel compression spring 10 is installed on one side of the impact drill body 1, and a gear adjustment knob 11 is rotatably mounted on the side of the mounting panel compression spring 10. The gear shift fork 4 is installed on one side of the gear adjustment knob 11 via a cylindrical pin 5 and a screw 2. A spring washer 3 is movably fitted between one side of the screw 2 and one side of the gear shift fork 4. One side of the gear shift fork 4 is installed on a knob flat washer 8 via two sets of cylindrical pins 7, and one side of the knob flat washer 8 is connected to the gear adjustment knob 11. The inner side of the gear adjustment knob 11 is arranged with a knob flat washer 8 sleeved on the outer surface of one end of the gear adjustment knob 11. Two sets of through holes are opened inside the knob flat washer 8, and one end of each of the two sets of cylindrical pins 7 passes through the corresponding through holes into the inside of the knob flat washer 8. One end of the gear adjustment knob 11 has an annular groove, and an O-ring 6 is sleeved inside the annular groove. A mounting panel compression spring 10 is installed inside the gear adjustment knob 11, and a knob push pin 9 is installed at the top of the mounting panel compression spring 10. The impact drill body 1... The output end is connected to an output shaft 12, and spur gear 13 and spur gear 2 16 are respectively fitted on the outer surface of the output shaft 12 at both ends. A sliding gear 15 is installed on the outer surface of the output shaft 12 at one end via a flat key 14. A clutch assembly 17 is connected to the outer surface of the output shaft 12 through the meshing of spur gear 13 and spur gear 2 16. One end of the gear shift fork 4 is fitted with one end of the sliding gear 15. The clutch assembly 17 includes a triple tooth 22, and the outer surface of the triple tooth 22 at one end... A disc spring 19 is installed via nut 18. A helical gear 21 is installed on one end of the outer surface of the triple gear 22. Three sets of gears are fixedly fitted on the outer surface of the triple gear 22. A waist-shaped washer 20 is fitted on the outer surface of the triple gear 22 below the disc spring 19. Copper friction plates 23 are provided at the positions between the bottom end of the waist-shaped washer 20 and the top end of the helical gear 21, and between the bottom end of the helical gear 21 and the top surface of one set of gears of the triple gear 22. The copper friction plates 23 are all fitted on the outer surface of the triple gear 22.

[0023] In use, the gear shift fork 4 is fixed to the inner side of the gear adjustment knob 11 by the cylindrical pin 5 and the screw 2, so that it can rotate synchronously. The O-ring 6 is inserted into the annular groove opened at one end of the gear adjustment knob 11, which can prevent oil leakage. The user can rotate the gear adjustment knob 11, which can drive the gear shift fork 4 to rotate accordingly, so that the sliding gear 15 can move on the outer surface of the flat key 14, and thus the sliding gear 15 can slide left and right on the outer surface of the output shaft 12, and can mesh with the gear part set on the outer surface of the triple gear 22 in the clutch assembly 17, thereby realizing three-speed shifting.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable speed adjustment switch assembly of a hammer drill comprising a hammer drill body (1) and a gear shift fork (4), characterized in that: A mounting panel compression spring (10) is installed on one side of the impact drill body (1), and a gear adjustment knob (11) is rotatably installed on one side of the mounting panel compression spring (10). The gear shift fork (4) is installed on one side of the gear adjustment knob (11) through a cylindrical pin (5) and a screw (2). A spring washer (3) is movably fitted between one side of the screw (2) and one side of the gear shift fork (4). One side of the gear shift fork (4) is installed on a knob flat washer (8) through two sets of cylindrical pins (7). One side of the knob flat washer (8) is set on the inner side of the gear adjustment knob (11). The mounting panel compression spring (10) is installed inside the gear adjustment knob (11), and a knob push pin (9) is installed on the top of the mounting panel compression spring (10).

2. A variable speed adjustment switch assembly for an impact drill according to claim 1, characterized in that: One end of the gear adjustment knob (11) has an annular groove, and an O-ring (6) is fitted inside the annular groove.

3. A variable speed adjustment switch assembly for an impact drill according to claim 1, characterized in that: The knob pad (8) has two sets of through holes inside, and one end of each of the two sets of cylindrical pins (7) passes through the corresponding through holes into the inside of the knob pad (8).

4. A variable speed adjustment switch assembly for an impact drill according to claim 1, characterized in that: The output end of the impact drill body (1) is connected to an output shaft (12), and a spur gear one (13) and a spur gear two (16) are respectively fitted on the outer surface of the output shaft (12) at both ends. A sliding tooth (15) is installed on the outer surface of the output shaft (12) at one end via a flat key (14). A clutch assembly (17) is connected to the outer surface of the output shaft (12) via the meshing of the spur gear one (13) and the spur gear two (16).

5. A variable speed adjustment switch assembly for an impact drill according to claim 4, characterized in that: The clutch assembly (17) includes a triple tooth (22), and a disc spring (19) is installed on one end of the outer surface of the triple tooth (22) by a nut (18). A helical gear (21) is installed on one end of the outer surface of the triple tooth (22), and three sets of gears are fixedly sleeved on the outer surface of the triple tooth (22).

6. A variable speed adjustment switch assembly for an impact drill according to claim 5, characterized in that: A waist-shaped washer (20) is fitted on the outer surface of the triple tooth (22) below the disc spring (19). Copper friction plates (23) are provided at the positions between the bottom end of the waist-shaped washer (20) and the top end of the helical gear (21) and between the bottom end of the helical gear (21) and the top surface of a set of gears of the triple tooth (22). The copper friction plates (23) are all fitted on the outer surface of the triple tooth (22).

7. A variable speed adjustment switch assembly for an impact drill according to claim 1, characterized in that: The knob pad (8) is fitted onto the outer surface of one end of the gear adjustment knob (11).

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