Electric drill

Abstract

The utility model relates to an electric drill, which comprises a chuck assembly, a drill rod assembly, a drill rod assembly, a drill rod assembly, a drill rod assembly, a drill rod assembly, a drill rod assembly and a drill rod assembly, and is characterized in that the chuck assembly comprises a clamping piece; the first end of the output shaft is inserted into the channel, and a threaded blind hole is formed in the first end; one end of the threaded fastener is in threaded connection with the threaded blind hole, and the other end of the threaded fastener is limited in the channel; the elastic piece is located in the threaded blind hole and exerts axial pre-tightening force on the threaded fastener in the direction facing the channel. According to the electric drill, the elastic piece is additionally arranged in the threaded blind hole of the output shaft and abuts against the threaded fastener in the direction facing the channel, the threaded fastener is prevented from loosening, and meanwhile the threaded fastener can be repeatedly disassembled and assembled, is not prone to loosening and is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of power tools, in particular to a drill. Background Art

[0002] Due to large torque and convenient use, drills are widely used, and are commonly used for drilling and screwing. The drill quickly clamps the drill bit through a chuck. In the existing drill, the chuck is axially limited by being screwed to the output shaft of the drill through a screw. Since there is a gap in the threaded connection, glue is usually coated on the outer surface of the screw, and the gap is filled with the glue to form an adhesive relationship to enhance the screwing firmness between the screw and the output shaft, thereby preventing the chuck from falling off during the use of the drill. In this solution, the screw is prone to looseness after being disassembled and reinstalled, and cannot effectively prevent the chuck from loosening. Summary of the Utility Model

[0003] Based on the above defects in the prior art, the purpose of the utility model is to provide a drill, in which an elastic member is added in the threaded blind hole of the output shaft to press tightly the threaded fastener along the direction of the channel towards the clamping member, preventing the threaded fastener from loosening. At the same time, the threaded fastener can be disassembled and reinstalled repeatedly and is not easy to loosen, facilitating maintenance.

[0004] For this reason, the utility model provides the following technical solutions.

[0005] The utility model provides a drill, which comprises:

[0006] A chuck assembly, which comprises a clamping member, one end of the clamping member is provided with a chuck for clamping a drill bit and the other end is provided with a channel;

[0007] An output shaft, the first end of which is inserted into the channel and the first end is provided with a threaded blind hole;

[0008] A threaded fastener, one end of which is screwed into the threaded blind hole and the other end is limited in the channel;

[0009] An elastic member, which is located in the threaded blind hole and applies an axial pre-tightening force to the threaded fastener in the direction towards the channel.

[0010] Optionally, the elastic member extends along the axial direction of the threaded blind hole.

[0011] Optionally, both ends of the elastic member respectively abut against the hole wall of the threaded blind hole and the end of the threaded fastener.

[0012] Optionally, the threaded blind hole is provided with a first clamping protrusion, one end of the threaded fastener is provided with a second clamping protrusion, and both ends of the elastic member are respectively clamped to the first clamping protrusion and the second clamping protrusion.

[0013] Optionally, the elastic member is a spring, and the elastic member is in a compressed state to apply an axial preload force to the threaded fastener.

[0014] Optionally, a protrusion is provided in the channel, and the head of the threaded fastener abuts against a surface wall of the protrusion on a side facing away from the threaded blind hole.

[0015] Optionally, the first end is threaded to the passage.

[0016] Optionally, the first end is snap-connected to the channel.

[0017] Optionally, the output shaft is provided with a shoulder, and the shoulder axially abuts against an end surface of the clamping member.

[0018] Optionally, an annular protrusion is provided at one end of the clamping member, and the annular protrusion abuts axially against the shaft shoulder.

[0019] The utility model has the following technical effects:

[0020] The utility model provides an electric drill, which adds an elastic member in the threaded blind hole of the output shaft, applies an axial pre-tightening force to the threaded fastener through the elastic member, and tightens the threaded fastener in the direction toward the channel of the clamping member, thereby eliminating or reducing the gap between the threaded fastener and the threaded blind hole, preventing the threaded fastener from loosening due to vibration generated during the operation of the electric drill, and avoiding the chuck assembly from falling off. At the same time, the threaded fastener can be repeatedly disassembled and assembled and is not easy to loosen, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial cross-sectional structural diagram of the electric drill of the utility model;

[0022] Figure 2 It is a schematic diagram of the assembly structure of the output shaft, threaded fastener and elastic member of the utility model;

[0023] Figure 3 An exploded view of the cross-sectional structure of the output shaft, the chuck assembly and the threaded fastener of the utility model;

[0024] Figure 4 It is an exploded view of the assembly structure of the output shaft, elastic member, threaded fastener and chuck assembly of the utility model.

[0025] Description of Reference Numerals

[0026] 100. Electric drill;

[0027] 1. chuck assembly; 11. clamping member; 111. clamping claw; 112. channel; 1121. protrusion; 113. annular protrusion; 12. rotating sleeve; 13. adjusting ring;

[0028] 2. Output shaft; 21. First end; 211. Threaded blind hole; 22. Axle shoulder;

[0029] 3. Threaded fastener; 31. Head; 32. Threaded post;

[0030] 4. Elastic member. Detailed implementation mode

[0031] To make the technical solutions and beneficial effects of the present utility model more obvious and understandable, the following will be described in detail by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0032] In the description of the present utility model, unless otherwise clearly defined, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplifying the description of the present utility model, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present utility model.

[0033] In the present utility model, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" can clearly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two; the meaning of "several" is at least one; unless otherwise clearly defined.

[0034] In the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection or an integral molding; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly defined, the first feature being "on", "above", "over", "upward", "under", "beneath", "below" or "downward" of the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" or "upward" of the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "downward" of the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] The "front" and "rear" mentioned in the present utility model are both based on Figure 1 the markings in

[0037] The following will Figures 1 to 4 describe in detail the electric drill of the present utility model.

[0038] In the present embodiment, as Figures 1 to 4 shown, the electric drill 100 includes a chuck assembly 1, an output shaft 2, a threaded fastener 3 and an elastic member 4. The chuck assembly 1 includes a clamping member 11 and a rotating sleeve 12. One end of the clamping member 11 is provided with a jaw 111 and the other end is provided with a channel 112. The rotating sleeve 12 is rotatably connected to the outer wall of the clamping member 11. By rotating the rotating sleeve 12, the jaw 111 can be controlled to open or close to clamp a drill bit. The first end 21 of the output shaft 2 is inserted into the channel 112, and a threaded blind hole 211 is provided at the first end 21. One end of the threaded fastener 3 is screwed into the threaded blind hole 211 and the other end is limited in the channel 112. The chuck assembly 1 and the output shaft 2 are assembled by the threaded fastener 3. The elastic member 4 is located in the threaded blind hole 211, and the elastic member 4 applies an axial pre-tightening force to the threaded fastener 3 in the direction towards the channel 112, that is, the elastic member 4 presses the threaded fastener 3 forward. The threaded fastener 3 can be specifically implemented as a screw.

[0039] By adopting the above technical solution, by adding the elastic member 4 in the threaded blind hole 211 and applying an axial pre-tightening force to the threaded fastener 3 through the elastic member 4, pressing the threaded fastener 3 in the direction towards the channel 112, the gap between the threaded fastener 3 and the threaded blind hole 211 is eliminated or reduced, preventing the threaded fastener 3 from loosening due to the vibration generated during the operation of the electric drill 100, and avoiding the chuck assembly 1 from falling off caused thereby. At the same time, the threaded fastener 3 can be repeatedly disassembled and assembled and is not easily loosened, facilitating maintenance.

[0040] In one embodiment, as Figure 1 shown, the elastic member 4 extends along the axial direction of the threaded blind hole 211.

[0041] Further, in one embodiment, if Figures 1 to 3 As shown, the two ends of the elastic member 4 are respectively in contact with the hole wall of the threaded blind hole 211 and the end of the threaded fastener 3, which is convenient for assembly. In order to prevent the elastic member 4 from shaking between the hole wall of the threaded blind hole 211 and the threaded fastener 3, the elastic member 4 is in contact with the hole wall of the threaded blind hole 211 in the radial direction of the threaded blind hole 211, which is conducive to the elastic member 4 to stably pre-tighten the threaded fastener 3 axially.

[0042] In another embodiment, the threaded blind hole 211 is provided with a first clamping protrusion (not shown in the figure), one end of the threaded fastener 3 is provided with a second clamping protrusion (not shown in the figure), and the two ends of the elastic member 4 are respectively clamped to the first clamping protrusion and the second clamping protrusion, so that the two ends of the elastic member 4 are limited and not prone to shaking.

[0043] In one embodiment, if Figure 1 As shown, the elastic member 4 is a spring. After the chuck assembly 1 and the output shaft 2 are assembled, the elastic member 4 is in a compressed state to apply an axial preload force to the threaded fastener 3 .

[0044] In one embodiment, if Figure 1 and Figure 3 As shown, a protrusion 1121 is provided in the channel 112, and the head 31 of the threaded fastener 3 abuts against the side wall of the protrusion 1121 away from the threaded blind hole 211. The threaded column 32 of the threaded fastener 3 is screwed into the threaded blind hole 211, and the protrusion 1121 is limited by the head 31, thereby axially limiting the chuck assembly 1.

[0045] In one embodiment, if Figure 2 and Figure 3 As shown, the first end 21 of the output shaft 2 is threadedly connected to the channel 112, and the output shaft 2 is used to radially and circumferentially limit the chuck assembly 1. In this way, the chuck assembly 1 is assembled in cooperation with the threaded fastener 3 to axially limit the chuck assembly 1.

[0046] In another embodiment, the first end 21 of the output shaft 2 is engaged with the channel 112 (not shown in the figure). Specifically, the outer wall of the output shaft 2 and the channel 112 can be engaged with the limiting protrusion and the limiting groove to achieve radial and circumferential limiting of the chuck assembly 1.

[0047] In one embodiment, if Figure 3 As shown, the output shaft 2 is provided with a shaft shoulder 22 , and the shaft shoulder 22 axially abuts against the end surface of the clamping member 11 to improve the stability of the axial limitation of the output shaft 2 to the chuck assembly 1 .

[0048] Furthermore, if Figure 3As shown, one end of the clamping member 11 is provided with an annular protrusion 113, and the annular protrusion 113 axially abuts against the shoulder 22 to enhance the structural strength of the portion where the clamping member 11 abuts against the shoulder 22.

[0049] In one embodiment, as Figure 3 shown, the chuck assembly 1 further includes an adjusting ring 13. The adjusting ring 13 is located between the jaws 111 and the rotating sleeve 12. The adjusting ring 13 is fixed to the rotating sleeve 12, and the inner wall of the adjusting ring 13 is screwed with the outer wall of the jaws 111. When clamping a drill bit, the user rotates the rotating sleeve 12, and the rotating sleeve 12 drives the adjusting ring 13 to rotate synchronously. Under the thread fit between the adjusting ring 13 and the jaws 111, the jaws 111 can be driven to open or close.

[0050] It should be understood that the above embodiments are all exemplary and do not cover all possible embodiments included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form additional embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only represent several embodiments of the present invention and do not limit the protection scope of the patent of the present invention.

Claims

1. An electric drill, characterized in that: The electric drill (100) comprises: A chuck assembly (1) comprises a clamping member (11), one end of the clamping member (11) being provided with a clamping claw (111) for clamping a drill bit and the other end of the clamping member (11) being provided with a channel (112); An output shaft (2), a first end (21) of which is inserted into the passage (112) and a threaded blind hole (211) is provided at the first end (21); A threaded fastener (3), one end of which is threadedly connected to the threaded blind hole (211) and the other end of which is confined in the passage (112); An elastic member (4) is located in the threaded blind hole (211) and applies an axial pre-tightening force to the threaded fastener (3) in a direction toward the channel (112).

2. The electric drill according to claim 1, characterized in that: The elastic member (4) extends along the axial direction of the threaded blind hole (211).

3. The electric drill according to claim 2, characterized in that: Both ends of the elastic member (4) abut against the hole wall of the threaded blind hole (211) and the end of the threaded fastener (3) respectively.

4. The electric drill according to claim 2, characterized in that: The threaded blind hole (211) is provided with a first clamping protrusion, one end of the threaded fastener (3) is provided with a second clamping protrusion, and both ends of the elastic member (4) are respectively clamped to the first clamping protrusion and the second clamping protrusion.

5. The electric drill according to claim 1, characterized in that: The elastic member (4) is a spring, and the elastic member (4) is in a compressed state to apply an axial pre-tightening force to the threaded fastener (3).

6. The electric drill according to claim 1, characterized in that: A protrusion (1121) is provided in the channel (112), and the head (31) of the threaded fastener (3) abuts against a surface wall of the protrusion (1121) that is away from the threaded blind hole (211).

7. The electric drill according to any one of claims 1 to 6, characterized in that: The first end (21) is screwed to the passage (112).

8. The electric drill according to any one of claims 1 to 6, characterized in that: The first end (21) is snap-connected to the channel (112).

9. The electric drill according to any one of claims 1 to 6, characterized in that: The output shaft (2) is provided with a shaft shoulder (22), and the shaft shoulder (22) axially abuts against the end surface of the clamping member (11).

10. The electric drill according to claim 9, characterized in that: An annular protrusion (113) is provided at one end of the clamping member (11), and the annular protrusion (113) abuts axially against the shaft shoulder (22).

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