Expansion head and handheld electric expander

Abstract

The utility model relates to the technical field of forcible entry tools, in particular to an expansion head and a handheld electric expander. The expansion head is used for being installed on a handheld hydraulic device and comprises an installation base and at least two expansion arms hinged to the installation base. A top column movably penetrates through the mounting base, the upper end of the top column protrudes to form a top supporting part, and a connecting part is formed at the lower end of the top column; an inner supporting inclined face is formed on the expansion arm, and the top supporting part movably abuts against the inner supporting inclined face. When the jacking column moves in the mounting base, the jacking part can abut against the inner supporting inclined face and slide, so that the expansion arms rotate, and the upper ends of the expansion arms are expanded. According to the technical scheme, the expansion head is small and exquisite in structure, simple in working principle and capable of stretching into some gaps with small sizes to work, and when people encounter some situations needing assistance of forcible entry tools in life, people can conveniently use the product in the technical scheme to conduct rapid treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of demolition tools, in particular to an expansion head and a handheld electric expander. Background Art

[0002] As a common demolition tool, expanders often play an important role in rescue work. Expanders can be inserted into gaps and expand objects to make it easier for people to remove stuck objects.

[0003] For example, a demolition tool disclosed in a fire rescue demolition hydraulic expander disclosed in Chinese patent number CN 201820971179.9, most of the demolition tools on the market are still mainly used by fire brigades or professional rescue teams. Therefore, these attacks are generally large in size and need to be equipped with special motors to work.

[0004] The prior art still has the following deficiencies:

[0005] In daily life, people occasionally encounter situations where they need to use expanders for assistance. Professional demolition tools are generally large in size and expensive, and they also need to be equipped with corresponding equipment, which leads to high costs. At the same time, untrained personnel can easily cause injuries to users during the process. Sometimes the problem is small, and it is a waste of time to seek rescue from the fire brigade or professional rescue teams. In summary, people have a strong demand for an expander that is portable and can solve small problems in life. Utility Model Content

[0006] The utility model aims to provide an expansion head of an expander which is portable and easy to operate and a handheld electric expander.

[0007] The purpose of this utility model is achieved in this way:

[0008] An expansion head, used for installation on a handheld hydraulic device, characterized in that it comprises a mounting seat and at least two expansion arms hinged on the mounting seat;

[0009] A top column is movably provided in the mounting seat, a top support portion is protrudingly formed at the upper end of the top column, and a connecting portion is formed at the lower end of the top column;

[0010] The expansion arm is formed with an inner support inclined surface, and the top support portion movably abuts against the inner support inclined surface;

[0011] When the top column moves in the mounting seat, the top support portion abuts against the inner support inclined surface and slides, so that the expansion arm rotates and the upper ends of the expansion arms are spread apart.

[0012] Preferably, a receiving groove is formed on the expansion arm, and a magnetic attraction member is fixedly arranged in the receiving groove. The magnetic attraction member can adsorb the top column to restrict the rotation of the expansion arm.

[0013] Preferably, the top column is magnetic;

[0014] The top column utilizes magnetism to absorb the expansion arm, so that the expansion arm fits on the top column, which is used to restrict the rotation of the expansion arm.

[0015] Preferably, the expansion arm comprises:

[0016] A hinged portion connected to a hinged seat on the mounting seat so that the expansion arm is hinged on the mounting seat;

[0017] The execution part has a plurality of expansion parts formed thereon.

[0018] Preferably, when the upper ends of the expansion arms are in contact with each other, the distance between the expansion parts at the upper ends is smaller than the distance between the expansion parts at the lower ends.

[0019] Preferably, the top support portion is formed with top support surfaces having the same number as the expansion arms, and the accommodating groove is provided on the inner support inclined surface so that the inner support inclined surface can be fitted on the top support surface.

[0020] Preferably, the edge of the top support portion fits with the edge of the top column.

[0021] Preferably, an expansion slope is formed on the upper end of the expansion arm, and the expansion slope gradually shrinks in a direction away from the mounting seat.

[0022] A handheld electric expander comprises a shell, a hydraulic device and an expansion head as claimed in any one of the claims.

[0023] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0024] 1. The expansion head of the present technical solution has a compact structure, a simple working principle, and can be inserted into some smaller gaps to work. When people encounter some situations in life that require the assistance of demolition tools, they can use the product in the present technical solution to quickly handle them.

[0025] 2. This technical solution can be easily installed and driven by a hydraulic cylinder. At the same time, the demolition head can be easily installed on the handle of the electric tool and can complete demolition work with light weight. It has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the first embodiment of the utility model in a closed state.

[0027] Figure 2 It is a cross-sectional view of the first embodiment of the present utility model.

[0028] Figure 3 It is a schematic diagram of the first embodiment of the utility model in a closed state.

[0029] Figure 4 It is a schematic diagram of the first embodiment of the utility model in the open state.

[0030] Figure 5 It is a structural diagram of the first embodiment of the utility model when assembled at the end of an electric expander.

[0031] Figure 6 It is an assembly schematic diagram of the first embodiment of the utility model when assembled at the end of an electric expander.

[0032] Figure 7 It is a structural schematic diagram of embodiment 3 of the present utility model.

[0033] Reference numerals:

[0034] 1. expansion arm 1; 11. hinged portion; 12. execution portion; 13. inner support inclined surface; 14. receiving groove; 15. expansion portion; 16. expansion inclined surface; 17. expansion arm 2;

[0035] 2. top column; 21. top support portion; 22. top support surface 1; 23. top support surface 2; 24. connecting portion; 25. transmission rod;

[0036] 3. Mounting seat; 31. Articulated seat; 32. Pin shaft; 33. Circlip; 34. Avoidance part;

[0037] 4. Magnetic parts;

[0038] 5. Expansion arm three;

[0039] 6. Shell; 61. Mounting port. DETAILED DESCRIPTION

[0040] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0041] Embodiment 1:

[0042] like Figure 1-Figure 4The expansion head shown is used for installation on a handheld hydraulic device, and includes a mounting base 3 and at least two expansion arms hinged on the mounting base 3. In this embodiment, an expansion arm 1 and an expansion arm 2 17 are hinged on the mounting base 3. This embodiment does not limit the number of expansion arms provided on the mounting base 3, and those skilled in the art can easily understand that merely increasing the number of expansion arms on the mounting base 3 should still be included in the protection scope of this patent.

[0043] It should be noted that the expansion arm 1 and the expansion arm 2 17 provided in this embodiment have the same structure, and different numbers are used to distinguish them only because the expansion arm 1 and the expansion arm 2 17 are provided at different positions. In order to facilitate subsequent explanations, they are distinguished.

[0044] The descriptive words such as "upper end", "lower end" and "horizontal plane" described in this article are not intended to further limit the use status of the product, but are only used for the convenience of explanation based on the illustration direction of the accompanying drawings.

[0045] When the upper ends of the expansion arm 1 and the expansion arm 2 17 are in contact with each other, the expansion head is in a closed state.

[0046] A top column 2 is movably provided in the mounting seat 3 . A top support portion 21 is protruding from the upper end of the top column 2 . A connecting portion 24 is formed at the lower end of the top column 2 . The connecting portion 24 is used to connect to a power source.

[0047] The expansion arm 1 and the expansion arm 2 17 are both formed with an inner supporting inclined surface 13 , and the top supporting portion 21 movably abuts against the inner supporting inclined surface 13 .

[0048] When the top column 2 moves upward along the vertical direction in the mounting seat 3, the top support portion 21 will abut against the inner support inclined surface 13 and slide. Since the inner support inclined surface 13 is inclined relative to the horizontal plane when the inner support inclined surface 13 contacts the top support portion 21, the vertical upward force of the top support portion 21 will be decomposed into part of the horizontal force, so that the expansion arm 1 and the expansion arm 2 17 can rotate, and the upper end of the expansion arm 1 and the upper end of the expansion arm 2 17 are spread apart by the top column 2, so as to realize the expansion action of using the expansion head.

[0049] like Figure 1 and Figure 2 As shown, in this embodiment, both the expansion arm 1 and the expansion arm 2 17 are formed with a receiving groove 14, and a magnetic attraction member 4 is fixedly arranged in the receiving groove 14, and the magnetic attraction member 4 can attract the top column 2. Therefore, when the expansion head is in a closed state, the rotation of the expansion arm 1 and the expansion arm 2 17 can be restricted to prevent the expansion arm 1 and the expansion arm 2 17 from swinging, thereby injuring the operator or the surrounding personnel.

[0050] like Figure 1-Figure 4 As shown, the expansion arm comprises:

[0051] The hinge part 11 is connected to the hinge seat 31 on the mounting seat 3, so that the expansion arm 1 and the expansion arm 2 17 are hinged on the mounting seat 3;

[0052] The execution part 12 is formed with a plurality of expansion parts 15, which are used to abut against the position to be expanded. When the top column 2 moves, the top column 2 will cause the expansion arm 1 and the expansion arm 2 17 to flip to both sides, thereby achieving the purpose of expansion.

[0053] Specific as Figure 4 As shown, when the upper ends of the expansion arm 1 and the expansion arm 2 17 fit each other, that is, the expansion head is in a closed state. The distance between the midpoints of the expansion parts 15 at the same height on the expansion arm 1 and the expansion arm 2 17 is called L. The expansion arm 1 and the expansion arm 2 17 shown in the figure are both formed with four expansion parts 15, so there are L1, L2, L3 and L4 respectively. And the distance between the expansion parts 15 at the upper end is smaller than the distance between the expansion parts 15 at the lower end, that is, L1 <L2<L3<L4。

[0054] Furthermore, the top support portion 21 is formed with the same number of top support surfaces as the expansion arms, and in this embodiment, the top support portion 21 is formed with top support surface 1 22 and top support surface 2 23. When the upper ends of the expansion arm 1 1 and the expansion arm 2 17 fit together, the top support surface 1 22 and the inner support inclined surface 13 on the expansion arm 1 1 are parallel to each other, and the top support surface 23 and the inner support inclined surface 13 on the expansion arm 2 17 are parallel to each other, so that the inner support inclined surface 13 on the expansion arm 1 1 and the expansion arm 2 17 can fit on the outer side of the top support portion 21. In actual work, since the expander needs to prop up heavy objects, the parallel inner support inclined surfaces 13 and the top support surfaces can reduce pressure, prevent parts from being damaged, and extend service life.

[0055] The accommodating groove 14 is formed on the inner supporting inclined surface 13 , so that the inner supporting inclined surface 13 can be more closely fitted on the top supporting surface 1 22 or the top supporting surface 23 .

[0056] like Figure 1-Figure 4 As shown, the edge of the top support portion 21 fits with the edge of the top column 2. When the inner support slope 13 and the top support portion 21 are separated as the top column 2 moves, the edge of the inner support slope 13 will still rest against the side wall of the top column 2, thereby ensuring that the expansion state of the expansion head is stable after the expansion arm 1 and the expansion arm 2 17 are rotated to both sides.

[0057] like Figure 1-Figure 4 As shown, the upper ends of expansion arm 1 and expansion arm 2 17 are formed with expansion slopes 16, and the expansion slopes 16 gradually shrink in the direction away from the mounting seat 3. The expansion slopes 16 enable the expansion head to extend into smaller gaps to expand the working scene.

[0058] like Figure 1-Figure 6 The handheld electric expander shown includes a housing 6 and an expansion head as described above. A mounting opening 61 is formed on the housing 6 so that the mounting seat 3 can be sleeved on the housing 6 .

[0059] The interior of the housing 6 is used to set a hydraulic device, and the connecting portion 24 of the top column 2 is connected to a transmission rod 25. The transmission rod 25 can enable the hydraulic device in the housing 6 to drive the top column 2 to move.

[0060] Embodiment 2:

[0061] This embodiment is basically the same as the first embodiment, except that the present embodiment does not have a magnetic attraction member 4, but uses a magnetic material to make the top column 2. Thus, the top column 2 can be used to magnetically attract the expansion arm, so that the expansion arm fits on the top column 2, which plays a role in restricting the rotation of the expansion arm.

[0062] Embodiment three:

[0063] This embodiment is basically the same as the first embodiment. Figure 7 As shown, the difference is that the mounting seat 3 is provided with an expansion arm 1 and an expansion arm 3 5 of different shapes, wherein the expansion arm 3 5 is fixed on the mounting seat 3, and the expansion arm 1 is hinged on the mounting seat 3. When the expansion head is in a closed state, the expansion arm 1 will abut against the expansion arm 3 5. Since in this embodiment, only the expansion arm 1 can rotate, the expansion arm 3 5 in this embodiment can be abutted against the wall surface, and the expansion arm 1 can be driven to rotate alone. Thereby, the pressure applied to the side wall surface by the expansion arm 3 5 can be reduced.

[0064] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An expansion head for mounting on a handheld hydraulic device, characterized in that: It comprises a mounting seat (3) and at least two expansion arms hinged on the mounting seat (3); A top column (2) is movably provided in the mounting seat (3), a top support portion (21) is protrudingly formed at the upper end of the top column (2), and a connecting portion is formed at the lower end of the top column (2); The expansion arm is formed with an inner support inclined surface (13), and the top support portion (21) movably abuts against the inner support inclined surface (13); When the top column (2) moves in the mounting seat (3), the top support portion (21) abuts against the inner support inclined surface (13) and slides, causing the expansion arm to rotate and the upper ends of the expansion arms to be spread apart.

2. An expansion head according to claim 1, characterized in that: A receiving groove (14) is formed on the expansion arm, and a magnetic attraction component (4) is fixedly arranged in the receiving groove (14). The magnetic attraction component (4) can absorb the top column (2) to restrict the rotation of the expansion arm.

3. An expansion head according to claim 1, characterized in that: The top column (2) is magnetic; The top column (2) uses magnetism to attract the expansion arm so that the expansion arm fits on the top column (2) to restrict the rotation of the expansion arm.

4. An expansion head according to claim 2 or 3, characterized in that: The expansion arm comprises: A hinged portion (11) connected to a hinged seat (31) on the mounting seat (3) so that the expansion arm is hinged on the mounting seat (3); The execution part (12) has a plurality of expansion parts (15) formed thereon.

5. An expansion head according to claim 4, characterized in that: When the upper ends of the expansion arms are in contact with each other, the distance between the expansion parts (15) at the upper ends is smaller than the distance between the expansion parts (15) at the lower ends.

6. An expansion head according to claim 4, characterized in that: The supporting portion (21) is formed with supporting surfaces having the same number as the expansion arms, and the accommodating groove (14) is provided on the inner supporting inclined surface (13), so that the inner supporting inclined surface (13) can be fitted on the supporting surface.

7. An expansion head according to claim 5, characterized in that: The edge of the top support portion (21) fits in with the edge of the top column (2).

8. An expansion head according to claim 5, characterized in that: An expansion slope (16) is formed at the upper end of the expansion arm, and the expansion slope (16) gradually shrinks in a direction away from the mounting seat (3).

9. A handheld electric expander, comprising a housing (6), characterized in that: Also includes: A hydraulic device and an expansion head as claimed in any one of claims 1 to 8.

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