An adjustable depth electric hammer drill

Abstract

This utility model discloses an adjustable-depth electric hammer drill, belonging to the field of electric hammer drills. The adjustable-depth electric hammer drill of this utility model includes a rotary motor, a drill chuck mounted at one end of the rotary motor, a first fixed block mounted on the drill chuck side of the rotary motor housing, and a first movable arm mounted on the first fixed block and connected to the first fixed block via a rotary bearing. A first semi-circular plate is mounted on the end of the first movable arm away from the first fixed block. This utility model solves the problems of existing electric hammer drills that rely on operator experience to mark the drill bit or make marks on the wall, visually controlling drilling. This method has large errors, low precision, high operator skill requirements, and low efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electric hammer drills, specifically an adjustable-depth electric hammer drill. Background Technology

[0002] A hammer drill is a common building and renovation tool, widely used for drilling holes in hard materials such as concrete and brick walls. In actual construction, it is often necessary to precisely control the drilling depth. For example, when installing expansion bolts, drilling too deep or too shallow will affect the installation quality and firmness. Current electric hammer drills rely on the operator's experience to mark the drill bit or make marks on the wall, and visual control is used during drilling. This method has large errors, low precision, high requirements for the operator, and low efficiency.

[0003] Therefore, there is a need in the prior art for a depth control device that is integrated into the electric hammer body, is easy to adjust, and has a simple structure. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable depth electric hammer drill, which is simple in structure, low in cost, easy to adjust and highly accurate, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable depth electric hammer drill, comprising a rotary motor, a drill chuck mounted on one end of the rotary motor, a first fixing block mounted on one side of the drill chuck on the rotary motor housing, and a first movable arm mounted on the first fixing block and connected to the first fixing block via a rotary bearing, a first semi-circular plate mounted on the end of the first movable arm away from the first fixing block, a connecting hole provided on the drill chuck, a drill rod mounted in the connecting hole, a depth limiting block mounted on the outer surface of the drill rod, and a second fixing block mounted on the other side of the rotary motor housing away from the first fixing block.

[0006] Furthermore, a second movable arm is installed on the second fixed block. The positions of the second movable arm and the movable arm correspond to each other. The two movable arms cooperate with each other. When it is necessary to adjust the drill bit extension length, the two movable arms are unfolded to adjust the depth of the drill rod inserted into the connecting hole. Then the movable arms are closed and the drill rod is locked by the limiting structure at one end of the movable arm to achieve the purpose of adjusting the drill bit extension length.

[0007] Furthermore, a second semicircular plate is installed at the end of the second movable arm away from the second fixed block, and the second semicircular plate is bolted to the second fixed block.

[0008] Furthermore, a second semicircular locking block is installed on the inner side of the second semicircular plate. The second semicircular locking block and the second semicircular plate are integrally set. The second semicircular plate and the first semicircular plate cooperate with each other. When the two semicircular plates abut to form a circular ring, the bolts are passed through the bolt holes opened on the semicircular plates to fix the two movable arms.

[0009] Furthermore, a first semicircular locking block is installed on the inner wall of the first semicircular plate. The first semicircular locking block is integrally formed with the first semicircular plate. When the first semicircular locking block and the second semicircular locking block lock the limiting block on the drill rod, they cooperate to lock into the groove between the limiting blocks from both sides, thereby achieving the purpose of fixing the length of the drill rod.

[0010] Furthermore, a drill bit is installed at the front end of the drill rod, and the drill bit is welded to the drill rod.

[0011] Furthermore, a handle is installed at the lower end of the rotary motor housing.

[0012] Furthermore, the handle has a battery compartment mounted at its lower end, away from the rotary motor.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention features multiple depth limiting blocks with equal spacing on the outer surface of the drill rod. Movable arms are located on both sides of the drill chuck, with a limiting clamping assembly at one end of each arm. The limiting clamping assembly consists of a semi-circular plate and a locking block. The semi-circular locking blocks on both sides are inserted between the depth limiting blocks to fix the length of the drill rod extending from the connecting hole. This allows for adjustment of the drill bit's extension length to achieve the desired drilling depth. When the semi-circular locking block clamps the drill rod, the second semi-circular plate cooperates with the first semi-circular plate. When the two semi-circular plates abut together to form a circular ring, bolts are passed through bolt holes in the semi-circular plates to fix the two movable arms. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall external structure of this utility model; Figure 2 This is a schematic diagram of the overall left-side structure of this utility model; Figure 3 This is a schematic diagram of the overall main structure of this utility model; Figure 4 This is an enlarged structural diagram of point A of this utility model.

[0015] In the diagram: 1. Battery compartment; 2. Handle; 3. Rotary motor; 301. Drill chuck; 302. Connecting hole; 4. First fixing block; 401. First movable arm; 402. First semicircular plate; 403. First semicircular locking block; 5. Second fixing block; 501. Second movable arm; 502. Second semicircular plate; 503. Second semicircular locking block; 6. Drill rod; 601. Depth limiting block; 602. Drill bit. Detailed Implementation

[0016] 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.

[0017] To address the problems of existing technologies where drilling relies on the operator's experience to mark the drill bit or the wall, and where drilling is controlled visually, resulting in large errors, low precision, high operator skill, and low efficiency, this embodiment provides the following technical solution: Example 1: As Figures 1-4 As shown, the device includes a battery compartment 1, which is fixedly installed at the lower end of the handle 2. The upper end of the handle 2 is fixedly connected to the lower part of the housing of the rotary motor 3. The front output shaft of the rotary motor 3 is coaxially fixedly connected to the drill chuck 301. The drill chuck 301 has a connecting hole 302 at its axial center. A first fixing block 4 is fixedly installed on one side of the front end of the housing of the rotary motor 3, and a second fixing block 5 is fixedly installed on the other side of the front end of the housing of the rotary motor 3, opposite to the first fixing block 4. A first movable arm 401 is hinged to the first fixing block 4 via a rotary bearing, allowing the first movable arm 401 to rotate relative to the first fixing block 4 in a plane parallel to the axis of the drill rod 6. A first semi-circular plate 402 is fixedly installed at the end of the first movable arm 401 away from the hinge end. A first semi-circular locking block 403 is fixedly embedded in the inner arc surface of the first semi-circular plate 402. A second movable arm 501 is hinged to the second fixing block 5 via another rotary bearing, and its rotation plane is parallel to the first movable arm 401. The second semicircular plate 502 is fixedly installed at the end of the second movable arm 501. The second semicircular locking block 503 is fixedly embedded in the inner arc surface of the second semicircular plate 502. The drill rod 6 is slidably inserted into the connecting hole 302 of the drill chuck 301. Multiple depth limiting blocks 601 are fixedly fitted or machined on the outer surface of the drill rod 6 at fixed intervals. The drill bit 602 is fixedly installed at the front end of the drill rod 6.

[0018] During operation, the user first selects the position between the corresponding depth limiting blocks 601 on the drill rod 6 according to the required drilling depth. The first movable arm 401 and the second movable arm 501 are then rotated outwards around their hinge points, separating the first semicircular plate 402 from the second semicircular plate 502, thus creating adjustment space for the drill rod 6. The drill rod 6 is then moved axially to change its length extending beyond the drill chuck 301 connection hole 302 until the target depth limiting block 601 reaches the preset position. The first movable arm 401 and the second movable arm 501 are then brought inwards, causing the first semicircular locking block 403 and the second semicircular locking block 503 to engage with the adjacent grooves of the target depth limiting block 601 from both sides, thereby precisely limiting the axial movement of the drill rod 6. Finally, bolts are used to secure the first semicircular plate 402 and the second semicircular plate 502, making the first movable arm 401 and the second movable arm 501 a rigid unit, firmly locking the extension length of the drill rod 6. Start the electric hammer drill to drill. When the depth limit block 601 moves with the drill rod 6 to contact the end face of the drill chuck 301, the feed stops and the drilling reaches the predetermined depth.

[0019] Example 2: Please refer to Figure 1 - Figure 4 Based on Embodiment 1, material specifications for key components were added and the structure was reinforced. The drill rod 6 and depth limiting block 601 can be made of high-strength alloy steel and surface hardened to enhance their wear resistance and impact resistance. The first semi-circular locking block 403 and the second semi-circular locking block 503 can be made of wear-resistant bronze or have embedded hard alloy plates to reduce wear with the depth limiting block 601 and prevent slippage. The first movable arm 401 and the second movable arm 501 can be made of high-strength engineering plastics or die-cast aluminum alloy to reduce overall weight while ensuring strength. The connecting bolts of the first semi-circular plate 402 and the second semi-circular plate 502 can be designed to prevent loosening.

[0020] During operation, its depth adjustment and locking mechanism is exactly the same as in Embodiment 1. The enhanced materials and structure make this depth adjustment device not only precise and reliable in locking, but also adaptable to long-term use of electric hammer drills under high-impact and high-vibration conditions, significantly improving the durability and service life of the device and reducing the decrease in accuracy and maintenance costs caused by component wear.

[0021] The working principle described above is as follows: The operator rotates and opens the movable arms 401 and 501 on both sides, directly moving the drill rod 6 axially to the desired position. Then, the movable arms are closed, causing the semi-circular locking blocks 403 and 503 at the ends of the movable arms to engage with the grooves in the depth limiting block 601 on the drill rod 6. Finally, the semi-circular plates 402 and 502 on both sides are tightened with bolts, thus quickly and accurately fixing the extension length of the drill rod 6. This process is achieved through a purely mechanical structure, requiring no other tools, and is intuitive and simple to operate. During drilling, when the fixed depth limiting block 601 moves with the drill rod 6 to contact the end face of the drill chuck 301, it cannot continue to advance, and the drilling depth is precisely limited.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] 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. An adjustable depth electric hammer drill, comprising a rotary motor (3), a drill chuck (301) is mounted on one end of the rotary motor (3), and a first fixing block (4) is mounted on the housing of the rotary motor (3) on one side of the drill chuck (301). Its features are: It also includes a first movable arm (401), which is mounted on a first fixed block (4) and connected to the first fixed block (4) via a rotary bearing. A first semi-circular plate (402) is mounted on the end of the first movable arm (401) away from the first fixed block (4). A connecting hole (302) is provided on the drill chuck (301), and a drill rod (6) is installed in the connecting hole (302). A depth limiting block (601) is installed on the outer surface of the drill rod (6). A second fixed block (5) is installed on the other side of the rotary motor (3) housing away from the first fixed block (4).

2. The adjustable-depth electric hammer drill according to claim 1, characterized in that: The second fixed block (5) is equipped with a second movable arm (501), and the position of the second movable arm (501) corresponds to the position of the movable arm (401).

3. The adjustable-depth electric hammer drill according to claim 2, characterized in that: The second movable arm (501) has a second semicircular plate (502) installed at the end away from the second fixed block (5), and the second semicircular plate (502) is bolted to the second fixed block (5).

4. The adjustable-depth electric hammer drill according to claim 3, characterized in that: A second semicircular block (503) is installed on the inner side of the second semicircular plate (502), and the second semicircular block (503) and the second semicircular plate (502) are integrally formed.

5. The adjustable-depth electric hammer drill according to claim 4, characterized in that: The inner wall of the first semicircular plate (402) is equipped with a first semicircular locking block (403), and the first semicircular locking block (403) and the first semicircular plate (402) are integrally formed.

6. The adjustable-depth electric hammer drill according to claim 1, characterized in that: A drill bit (602) is installed at the front end of the drill rod (6), and the drill bit (602) is welded to the drill rod (6).

7. The adjustable-depth electric hammer drill according to claim 1, characterized in that: The rotary motor (3) has a handle (2) installed at the lower end of its housing.

8. The adjustable-depth electric hammer drill according to claim 7, characterized in that: The handle (2) has a battery compartment (1) mounted at its lower end away from the rotary motor (3).

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