Hand-held hole digger with safety guard
By introducing safety protection devices into the post hole digger, and using the combination of metal limit switches and kill wires, the problem of the engine continuing to run when the drill bit encounters hard objects is solved, and automatic shutdown or idling is achieved, avoiding the risk of personal injury and loss of control of the control lever.
Patent Information
- Application Number
- CN202521135228.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-06-02
- Estimated Expiration
- 2035-06-05
AI Technical Summary
When the drill bit of an existing post hole digger hits a hard object, the engine continuously outputs torque, causing a reaction torque to be transmitted to the human body, which can easily cause muscle strains or joint sprains in the arms. Furthermore, if the drill rod gets stuck, it may cause the control lever to swing out of control, endangering the safety of people in the vicinity.
A hole digger with a safety protection device was designed, including a metal limit switch, a contact block, and an ignition stop wire. When the drill rod encounters a hard object, the contact block triggers the switch, and the ignition stop wire sends a signal to shut down the engine or switch it to idle speed to prevent it from continuing to operate.
It effectively prevents injuries caused by the engine running continuously when the drill pipe encounters hard objects, protecting the safety of operators and surrounding personnel.
Smart Images
Figure CN224306356U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of garden machinery technology, specifically relating to a handheld hole digger with safety protection. Background Technology
[0002] A garden handheld hole digger is a portable mechanical device mainly used for quickly digging holes in gardens, tree planting, and other planting scenarios. It is suitable for drilling holes in soil, frozen soil, and ice, and is widely used in gardens, planting, tree planting, geophysical exploration, road construction and other fields.
[0003] In existing posthole diggers, when the drill bit hits a hard object during operation, the upper engine continues to output torque. The reaction torque is transmitted to the human body through the control lever, which can easily cause muscle strain or joint sprain. More seriously, some models continue to spin at high speed even after the drill rod is stuck, which may cause the control lever to swing out of control and cause injury to people in the vicinity. Therefore, we propose a handheld posthole digger with safety protection. Utility Model Content
[0004] To address the issue raised in the background section regarding the existing posthole diggers where, during operation, the upper engine continues to output torque when the drill bit encounters a hard object, the reaction torque is transmitted to the operator via the control lever, easily causing muscle strains or joint sprains. More seriously, some models continue to spin at high speed even after the drill rod jams, potentially causing the control lever to swing uncontrollably and injure nearby personnel. This invention provides a handheld posthole digger with safety protection.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a handheld hole digger with safety protection, comprising an engine and a safety protection device, wherein a ground drill frame is bolted to the bottom of the engine, a gearbox is installed in the middle of the bottom of the ground drill frame, a drill rod is vertically connected to the output end of the gearbox, and a safety protection device is provided on one side of the gearbox;
[0006] The safety protection device is equipped with a protective box, and a metal limit switch is installed on the inner wall of the protective box. A contact block is provided on one side of the metal limit switch, and one end of the metal limit switch is connected to a limit switch kill wire. An engine kill wire is installed inside the engine.
[0007] As a preferred embodiment of the present invention, a portable hole digger with safety protection is provided, wherein the protective box, the limit switch and the contact block form a semi-enclosed structure, and a protective cover is bolted to the lower end of the protective box.
[0008] As a preferred embodiment of the present invention, a portable hole digger with safety protection includes a control lever, a protective box, a rotating shaft, a torsion spring, a limit stake, and a contact block.
[0009] As a preferred embodiment of the present invention, a portable hole digger with safety protection is provided, wherein the upper part of the safety protection device is equipped with a control lever.
[0010] As a preferred embodiment of the present invention, a portable hole digger with safety protection is provided, wherein a rotating shaft is installed inside the protective box, and limit stakes are provided on both sides of the rotating shaft, a torsion spring is sleeved on the outside of the rotating shaft, and the operating lever is connected to the rotating shaft by screws or pins.
[0011] As a preferred embodiment of the present invention, a portable hole digger with safety protection is provided with a rubber plug on the outside of the limit switch shutdown wire, and the rubber plug is made of rubber and pressed into the cable hole of the protective box.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: When the drill rod encounters a hard object and stops rotating during operation, the engine continues to run, which will drive the control lever, rotating shaft and contact block in the safety protection device to rotate together. The rotating contact block will contact the metal limit switch and trigger the switch action. At this time, the limit switch kill line will be connected to the machine body kill line, thereby sending a kill or idle signal to the engine. After receiving the signal, the engine will immediately kill or enter the idle state, thereby avoiding the damage that may be caused by continued operation. 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 overall structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the safety protection device in this utility model;
[0016] Figure 3 This is a schematic diagram of the control lever and protective box in this utility model;
[0017] Figure 4 In this utility model Figure 3 A magnified structural diagram of point A in the middle.
[0018] In the diagram: 1. Engine; 2. Drill frame; 3. Gearbox; 4. Drill rod; 5. Safety protection device; 6. Control lever; 7. Protective box; 8. Shaft; 9. Torsion spring; 10. Rubber plug; 11. Limit post; 12. Contact block; 13. Metal limit switch; 14. Limit switch kill wire; 15. Engine kill wire; 16. Protective cover. 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 Figures 1-4 As shown;
[0022] A portable post hole digger with safety protection includes an engine 1 and a safety protection device 5. A ground drill frame 2 is bolted to the bottom of the engine 1. A gearbox 3 is installed in the middle of the bottom of the ground drill frame 2. A drill rod 4 is vertically connected to the output end of the gearbox 3. The safety protection device 5 is provided on one side of the gearbox 3. A protective box 7 is provided inside the safety protection device 5. A metal limit switch 13 is installed on the inner wall of the protective box 7. A contact block 12 is provided on one side of the metal limit switch 13. One end of the metal limit switch 13 is connected to a limit switch kill wire 14. An engine kill wire 15 is installed inside the engine 1.
[0023] In this implementation plan: when the drill rod 4 encounters a hard object and stops rotating during operation, the engine 1 continues to run, which will drive the control lever 6, the rotating shaft 8, and the contact block 12 in the safety protection device 5 to rotate together. The rotating contact block 12 will contact the metal limit switch 13 and trigger the switch action. At this time, the limit switch kill line 14 will be connected to the machine body kill line 15, thereby sending a kill or idle signal to the engine 1. After receiving the signal, the engine 1 will immediately kill or enter the idle state, thereby avoiding the damage that may be caused by continued operation.
[0024] Furthermore:
[0025] In an optional embodiment, the protective box 7 forms a semi-enclosed structure with the metal limit switch 13 and the contact block 12, and a protective cover 16 is bolted to the lower end of the protective box 7.
[0026] In this implementation plan: the protective box 7 is part of the safety protection device 5, which is used to further prevent dust and moisture from entering and protect core components such as the metal limit switch 13 from dust and debris.
[0027] Furthermore:
[0028] In an optional embodiment, the safety protection device 5 includes a control lever 6, a protective box 7, a rotating shaft 8, a torsion spring 9, a limit post 11, and a contact block 12, with the control lever 6 mounted on the upper part of the safety protection device 5.
[0029] In this embodiment: the control lever 6 is connected to the rotating shaft 8 by screws or pins, which facilitates operator control or disassembly during transportation. The contact block 12 is used to drive the control lever 6 to rotate when it is subjected to external force.
[0030] Furthermore:
[0031] In an optional embodiment, a rotating shaft 8 is installed inside the protective box 7, with limit posts 11 on both sides of the rotating shaft 8, and a torsion spring 9 is sleeved on the outside of the rotating shaft 8. The operating lever 6 is connected to the rotating shaft 8 by screws or pins.
[0032] In this implementation scheme: the control lever 6 can be linked with the contact block 12 through the rotating shaft 8, the limit post 11 can ensure that the rotating shaft 8 will not exceed the predetermined range when rotating, thereby maintaining the stability and reliability of the safety protection device 5, and the torsion spring 9 is used to keep the control lever 6 in a certain position under normal conditions.
[0033] Furthermore:
[0034] In an optional embodiment, a rubber plug 10 is fitted on the outside of the limit switch kill wire 14, and the rubber plug 10 is made of rubber and pressed into the cable through hole of the protective box 7.
[0035] In this embodiment: the rubber stopper 10 is used to seal the exit hole of the fire stop wire of the metal limit switch 13.
[0036] Working principle: The control lever 6 is connected to the rotating shaft 8 by screws or pins, making it easy to remove during packaging and transportation to reduce space occupation and facilitate transportation. The protective box 7 and protective cover 16 are used to protect the internal structure of the safety protection device 5 and prevent dust and debris from entering. The rubber plug 10 is used to seal the exit hole of the metal limit switch 13 to further prevent dust and moisture from entering. Secondly, the engine 1 drives the drill rod 4 to rotate through the gearbox 3 to realize the digging operation. The control lever 6 inside the safety protection device 5 is kept in the normal position under the torsion of the torsion spring 9 and does not come into contact with the human body or other objects. Then, when the drill rod 4 encounters a hard object and stops rotating during operation, the engine 1 may continue to run. At this time, due to the continuous operation of the engine 1, When the drill rod 4 is rotated, it will cause the control lever 6 in the safety protection device 5 to rotate. If the control lever 6 comes into contact with a person or other object, it will cause the rotating shaft 8 and the contact block 12 to rotate together. The rotating contact block 12 will contact the metal limit switch 13 and trigger the switch action. Finally, after the metal limit switch 13 is touched, its limit switch kill wire 14 will be connected to the machine body kill wire 15, thereby sending a kill or idle signal to the engine 1. After receiving the signal, the engine 1 will immediately kill or enter the idle state, thereby avoiding the possible damage caused by continued operation. Through the coordinated action of the metal limit switch 13 in the safety protection device 5 and related components, the function of automatically killing or entering the idle state when the drill rod 4 encounters a hard object is realized, thereby effectively protecting the safety of the operator.
[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is 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 safety protection, comprising an engine (1) and a safety protection device (5), characterized in that: A drilling frame (2) is bolted to the bottom of the engine (1), and a gearbox (3) is installed in the middle of the bottom of the drilling frame (2). A drill rod (4) is vertically connected to the output end of the gearbox (3), and a safety protection device (5) is provided on one side of the gearbox (3). The safety protection device (5) is equipped with a protective box (7), and a metal limit switch (13) is installed on the inner wall of the protective box (7). A contact block (12) is provided on one side of the metal limit switch (13), and a limit switch kill wire (14) is connected to one end of the metal limit switch (13). An engine kill wire (15) is installed inside the engine (1).
2. The handheld post hole digger with safety protection according to claim 1, characterized in that: The protective box (7) forms a semi-enclosed structure with the limit switch (13) and the contact block (12), and a protective cover (16) is bolted to the lower end of the protective box (7).
3. A handheld post hole digger with safety protection according to claim 1, characterized in that: The safety protection device (5) includes a control lever (6), a protective box (7), a rotating shaft (8), a torsion spring (9), a limit post (11), and a contact block (12).
4. A handheld post hole digger with safety protection according to claim 3, characterized in that: The safety protection device (5) is equipped with an operating lever (6) on its upper part.
5. A handheld post hole digger with safety protection according to claim 3, characterized in that: The protective box (7) is equipped with a rotating shaft (8), and limit stakes (11) are provided on both sides of the rotating shaft (8). A torsion spring (9) is sleeved on the outside of the rotating shaft (8). The operating lever (6) is connected to the rotating shaft (8) by screws or pins.
6. A handheld post hole digger with safety protection according to claim 1, characterized in that: A rubber plug (10) is fitted on the outside of the limit switch shutdown wire (14), and the rubber plug (10) is made of rubber and pressed into the cable hole of the protective box (7).