Portable hole digger with safety switch

Abstract

The utility model discloses a hand-held earth boring machine with a safety switch, and belongs to the technical field of garden machinery. The hole digger comprises an engine, a rack, a gear box, a drill bit and an overload protection device, the overload protection device is installed on the rack through a body, a rotating shaft on the body is connected with a control soft rod and an eccentric wheel, a torsion spring is sleeved on the rotating shaft, and an accelerator cable bypasses the eccentric wheel to be connected with the engine. When the drill bit touches a hard object and stops rotating, the soft rod is controlled to drive the rotating shaft and the eccentric wheel to rotate, the accelerator cable is loosened, the engine speed is reduced, and overload protection is achieved. The eccentric wheel mechanical mechanism is adopted, the structure is simple, waterproof, dustproof, safe and reliable, and the problem that arms of operators are sprained due to continuous operation of an engine when a drill bit meets resistance in the prior art is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of garden machinery technology, specifically to a handheld post hole digger with a safety switch, which is particularly suitable for garden operation equipment that requires safety protection, such as ground drills, ice drills, handheld post hole diggers, and drilling machines. Background Technology

[0002] In the field of garden machinery, handheld posthole diggers are commonly used tools, mainly for digging holes and drilling. However, existing handheld posthole diggers have a significant drawback: when the drill bit encounters a hard object (such as a rock or tree root), it is forced to stop rotating, but the upper engine continues to run. At this time, the engine's power cannot be transmitted through the drill bit, generating a large reaction force that can easily cause arm sprains for the operator, posing a safety hazard.

[0003] Similar safety protection technologies already exist on the market, such as the electronic switch used as a safety protection device in patent CN216218663U. However, this solution has significant shortcomings: electronic switches have complex structures and high manufacturing costs; in outdoor working environments, electronic components are susceptible to damage from rain, dust, and other factors, leading to malfunctions or decreased sensitivity; and the reliability of electronic switches is relatively low, potentially failing to respond promptly at critical moments and thus failing to effectively protect the safety of operators. Therefore, there is an urgent need for a safety protection device that is simple in structure, safe and reliable, and suitable for outdoor working environments. Utility Model Content

[0004] The purpose of this utility model is to provide a portable hole digger with a safety switch, which achieves overload protection through mechanical structure, solves the safety problem caused by the continuous operation of the engine when the drill bit encounters a hard object in the prior art, overcomes the defects of the existing electronic switch structure being complex and unreliable, and achieves the technical effect of simple structure, waterproof and dustproof, safe and reliable.

[0005] A portable post hole digger with a safety switch includes an engine, a frame, a gearbox, a drill bit, and an overload protection device. The frame is equipped with a throttle switch, which is connected to a throttle cable. The throttle cable is used to control the throttle position of the engine.

[0006] Furthermore, the overload protection device includes a body with a rotating shaft mounted on it. The lower part of the rotating shaft is connected to a control lever, and the upper part is equipped with an eccentric wheel. A torsion spring is sleeved on the rotating shaft. A protective cover is provided on the upper part of the body, and the throttle cable passes around the eccentric wheel and connects to the engine.

[0007] Normal operating condition: When the drill bit rotates normally, the control lever remains in its normal position under the torque of the torsion spring. At this time, the eccentric wheel is at a specific angle, and the throttle cable is wound around the highest point of the eccentric wheel, keeping the throttle cable taut. The throttle cable tension ensures that the throttle switch is in the throttle position, the engine maintains normal speed, and the drill bit operates normally.

[0008] Overload protection mode: When the drill bit encounters a hard object and stops rotating, the engine continues to run. The resistance experienced by the drill bit is transmitted through the transmission system, causing the control lever to contact the operator's body (or displace upon encountering resistance). The displacement of the control lever causes the shaft to rotate, which in turn causes the eccentric wheel to rotate synchronously. After the eccentric wheel rotates, the throttle cable shifts from its highest point to its lowest point, changing from a taut to a slack state. This slack causes the throttle switch to reset, reducing the engine's fuel supply and rapidly lowering the engine speed, preventing injury to the operator's arm from the reaction force generated by continuous high engine speed. Once the hard object is removed, the torsion spring's torque resets the control lever and eccentric wheel, the throttle cable re-tensions, and the engine returns to normal speed.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] Simple and reliable structure: It adopts an eccentric wheel mechanical mechanism, which does not require complex electronic components, has a simple structure, low manufacturing cost, and is easy to maintain.

[0011] Effective safety protection: Overload protection is achieved through mechanical transmission, with a rapid response. When the drill bit encounters obstruction, the engine speed can be reduced in time to effectively prevent operator injury.

[0012] Suitable for outdoor environments: The overload protection device is equipped with a protective cover, which has good waterproof and dustproof performance, and can work stably in harsh outdoor working environments, improving the reliability and service life of the equipment. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a partial structural schematic diagram of the present invention;

[0016] Figure 3 for Figure 2 Enlarged schematic diagram of the upper structure;

[0017] In the picture:

[0018] Engine 1, Frame 2, Throttle switch 21, Gearbox 3, Drill bit 4, Overload protection device 5, Body 51, Shaft 52, Control lever 53, Eccentric wheel 54, Torsion spring 55, Protective cover 56, Throttle cable 6. Detailed Implementation

[0019] 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.

[0020] Example 1

[0021] like Figure 1-3 As shown;

[0022] A portable hole digger with a safety switch.

[0023] This implementation plan addresses the technical problems existing in the prior art, as disclosed in the background section above: "In the field of garden machinery, handheld posthole diggers are commonly used tools, mainly for digging holes and drilling. Existing handheld posthole diggers have significant drawbacks during use: when the drill bit encounters a hard object (such as a rock or tree root), the drill bit is forced to stop rotating, but the upper engine continues to run. At this time, the engine's power cannot be output through the drill bit, generating a large reaction force, which can easily cause arm sprains for the operator, posing a safety hazard."

[0024] Similar safety protection technologies already exist on the market, such as the electronic switch used as a safety protection device in patent CN216218663U. However, this solution has significant shortcomings: electronic switches have complex structures and high manufacturing costs; in outdoor working environments, electronic components are susceptible to damage from rain, dust, and other factors, leading to malfunctions or decreased sensitivity; and the reliability of electronic switches is relatively low, potentially failing to respond promptly at critical moments, thus failing to effectively protect the safety of operators. Therefore, there is an urgent need for a safety protection device that is simple in structure, safe and reliable, and adaptable to outdoor working environments. In practical terms, this problem is clearly real and difficult to solve. Therefore, to address this technical problem, a portable post hole digger with a safety switch is provided.

[0025] like Figure 1-3 As shown in the figure;

[0026] This utility model of a portable post hole digger with a safety switch mainly consists of an engine 1, a frame 2, a gearbox 3, a drill bit 4, and an overload protection device 5. The frame 2 is an integral support frame. The engine 1 is mounted on the upper part of the frame 2. The gearbox 3 is located below the engine 1 and connected to the output shaft of the engine 1. The drill bit 4 is mounted at the lower end of the gearbox 3. Power transmission from the engine 1 to the drill bit 4 is achieved through the gearbox 3.

[0027] An overload protection device 5 is installed on one side of the frame 2, including a body 51, which is fixed to the frame 2 by bolts. A rotating shaft 52 is installed through the body 51, and the rotating shaft 52 can rotate freely within the body 51. The lower part of the rotating shaft 52 extends out of the body 51 and is connected to an operating lever 53. The end of the operating lever 53 faces the operator's hand position, so as to facilitate contact with the operator's body or sense resistance when the drill bit 4 encounters resistance. The upper part of the rotating shaft 52 extends out of the body 51 and is equipped with an eccentric wheel 54. The center of the eccentric wheel 54 is eccentrically set with respect to the axis of the rotating shaft 52 to achieve stroke control of the throttle cable 6 during rotation. A torsion spring 55 is sleeved on the rotating shaft 52 and located inside the body 51. One end of the torsion spring 55 is fixed to the body 51, and the other end is fixed to the rotating shaft 52, providing a reset torque for the rotating shaft 52. A protective cover 56 is installed on the upper part of the main body 51 by screws. The protective cover 56 can prevent rainwater and dust from entering the overload protection device 5 and play a role in waterproofing and dustproofing.

[0028] The throttle switch 21 is installed on the handle of the frame 2 for easy operation by the operator. The throttle switch 21 is connected to the throttle cable 6. One end of the throttle cable 6 is connected to the throttle switch 21, and the other end passes around the outer periphery of the eccentric wheel 54 and is connected to the throttle control mechanism of the engine 1.

[0029] During normal operation, under the torque of the torsion spring 55, the control lever 53 is in the initial position, which drives the rotating shaft 52 and the eccentric wheel 54 to maintain a fixed angle. At this time, the throttle cable 6 is wound around the highest point of the eccentric wheel 54 and is in a taut state, so that the throttle switch 21 is kept in the position of throttle, the engine 1 runs at normal speed, and the drill bit 4 works normally.

[0030] When drill bit 4 encounters a hard object and stops rotating, engine 1 continues to run. The resistance experienced by drill bit 4 is transmitted through gearbox 3, causing a backward force on control lever 53 (or contact with the operator's arm). Control lever 53 drives shaft 52 to rotate against the torque of torsion spring 55, which in turn drives eccentric wheel 54 to rotate. After eccentric wheel 54 rotates, throttle cable 6 slides from its highest point to its lowest point, releasing its length and changing from a tensioned to a slack state. The slack in throttle cable 6 causes throttle switch 21 to reset, reducing the fuel supply to engine 1. Engine speed decreases rapidly, thus eliminating the reaction force caused by drill bit obstruction and protecting operator safety. When the hard object is removed, the torque of torsion spring 55 resets shaft 52 and eccentric wheel 54, throttle cable 6 re-tensions, and engine 1 returns to normal speed.

[0031] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A portable post hole digger with a safety switch, comprising an engine (1), a frame (2), a gearbox (3), and a drill bit (4), wherein the frame (2) is provided with a throttle switch (21), the throttle switch (21) being connected to a throttle cable (6), characterized in that: It also includes an overload protection device (5), which includes a body (51), a rotating shaft (52) is mounted on the body (51), the lower part of the rotating shaft (52) is connected to the control lever (53), the upper part is mounted with an eccentric wheel (54), a torsion spring (55) is sleeved on the rotating shaft (52), the upper part of the body (51) is provided with a protective cover (56), and the throttle cable (6) passes around the eccentric wheel (54) and is connected to the engine (1).

2. A portable post hole digger with a safety switch according to claim 1, characterized in that: The center of the eccentric wheel (54) is eccentrically positioned relative to the axis of the rotating shaft (52).

3. A portable post hole digger with a safety switch according to claim 1, characterized in that: One end of the torsion spring (55) is fixed to the body (51), and the other end is fixed to the rotating shaft (52).

4. A portable post hole digger with a safety switch according to claim 1, characterized in that: The protective cover (56) is fixed to the upper part of the body (51) by screws.

5. A portable post hole digger with a safety switch according to claim 1, characterized in that: The end of the control lever (53) is oriented towards the operator's hand position.

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