Extension rod of strong magnetic tool

Abstract

The strong magnetic tool extension rod comprises an extension rod body, magnets and magnetic conduction structures, the magnets are symmetrically distributed on the side portion of the extension rod body with the axis of the extension rod body as the center, and the magnetic conduction structures are arranged on the axial side portions of the magnets. Wherein the magnetic conduction structure comprises a front magnetic conduction structure and a rear magnetic conduction structure which are arranged on the two sides of the magnet respectively, the front magnetic conduction structure is arranged at the adaptive tool head connecting end of the extension rod, and the rear magnetic conduction structure is arranged at the receiving tool driving connecting end of the extension rod. Compared with the prior art, the electric tool bit has the advantages that magnetic lines of force are guided and collected towards the bit tip through the magnetic conductive structure, the magnetic field direction is improved, the magnetism of the bit tip is higher, and the technical problem that in the prior art, an electric tool bit is poor in screw adsorption capacity is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electric tool accessory components, and in particular to a strong magnetic tool extension rod. Background Art

[0002] When an electric tool (usually an electric drill) is in operation, in order to improve work efficiency, the screwdriver bit is usually required to have a certain screw-supporting function. In the prior art, a magnetic screwdriver bit is usually used to absorb screws. When using an extension rod, the magnetism of the screwdriver bit mainly comes from the magnet set in the extension rod where the screwdriver bit is installed. The magnet magnetizes the screwdriver bit through contact with the flat surface of the screwdriver bit tail, thereby achieving the effect of screw absorption. Therefore, it can be considered that the magnet located inside the sleeve transfers the magnetism to the screw connected to the screwdriver bit through the screwdriver bit. However, this screw-supporting method is not very effective. The main reasons are that the screw is far away from the magnet, and the contact area between the flat surface of the screwdriver bit tail and the magnet is limited. In addition, the inner hole size of the extension rod limits the increase in the volume of the magnet to achieve further improvement in magnetic force.

[0003] In order to improve the above phenomenon, people set magnets and sleeves for fixing magnets on the outside of the exposed part of the screwdriver bit inserted into the hole of the extension rod, so that the magnet can directly contact and adsorb the screw. In this way, the adsorption capacity of the screw can be increased by using a magnet with a larger volume and a smaller distance from the screw. But the disadvantage is that the diameter of the connecting rod becomes very thick, which affects the user's line of sight. In some working conditions, it is not conducive for the user to smoothly align the tip of the screwdriver bit with the tail interface of the screw, such as when removing the screw. On the other hand, the magnets around the tip of the screwdriver bit with a larger diameter are not conducive to loading and unloading screws in the countersunk hole, and the magnets need to be removed first to change the diameter before the work can be completed. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a strong magnetic tool extension rod, which solves the technical problem in the prior art that the electric tool bit has poor adsorption ability for screws.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A strong magnetic tool extension rod comprises an extension rod, a magnet and a magnetic conductive structure. The magnet is symmetrically distributed on the side of the extension rod with the axis of the extension rod as the center, and the magnetic conductive structure is arranged on the axial side of the magnet.

[0007] Preferably, the aforementioned strong magnetic tool extension rod: the magnetic conductive structure includes a front magnetic conductive structure and a rear magnetic conductive structure respectively arranged on both sides of the magnet, the front magnetic conductive structure is arranged at the adapter tool head connection end of the extension rod, and the rear magnetic conductive structure is arranged at the tool receiving drive connection end of the extension rod.

[0008] Preferably, the aforementioned strong magnetic tool extension rod magnet is annular and sleeved on the extension rod, the front magnetic structure is a front magnetic ring sleeved on the extension rod tool head connecting end, and the rear magnetic structure is a rear magnetic ring sleeved on the extension rod drive tool connecting end.

[0009] Preferably, the axial length of the front magnetic ring of the aforementioned strong magnetic tool extension rod is greater than the axial length of the magnet, and the axial length of the rear magnetic ring is greater than the axial length of the magnet.

[0010] Preferably, the aforementioned strong magnetic tool extension rod magnet is a magnetic ring, and the inner hole of the magnetic ring is in contact with the outer surface of the extension rod.

[0011] Preferably, in the aforementioned strong magnetic tool extension rod, the magnetic conductive structure is in multi-point contact or surface contact with the outer surface of the extension rod.

[0012] Preferably, in the aforementioned strong magnetic tool extension rod, the inner walls of the front magnetic ring and the rear magnetic ring are in contact with the outer surface of the extension rod.

[0013] Preferably, the aforementioned strong magnetic tool extension rod: the extension rod is provided with a bit connection hole, the bottom of the bit connection hole is also provided with an inner rod magnet, and the magnetic pole direction of the inner rod magnet is the same as the magnetic pole direction of the magnetic ring.

[0014] Preferably, in the aforementioned strong magnetic tool extension rod: the axial distance between the front magnetic ring and the magnet does not exceed 3 mm and a non-magnetic structure is provided between the two, and the axial distance between the rear magnetic ring and the magnet does not exceed 3 mm and a non-magnetic structure is provided between the two.

[0015] Preferably, the aforementioned strong magnetic tool extension rod: the extension rod is made of non-magnetic material.

[0016] Preferably, in the aforementioned strong magnetic tool extension rod, the magnetic conductive structure includes an end with a smaller diameter and an end with a larger diameter, and the end with the larger diameter is closer to the magnet than the end with the smaller diameter.

[0017] Preferably, the aforementioned strong magnetic tool extension rod has a detachable structure between the end with a smaller diameter and the end with a larger diameter.

[0018] Preferably, the aforementioned strong magnetic tool extension rod has a smaller diameter end which is a sleeve, a sleeve with an opening on the side, a spring sheet, or one or more combinations of a spring.

[0019] The beneficial effects achieved by the present invention are:

[0020] Compared with the prior art, the present invention guides and gathers the magnetic lines of force to the tip of the bit through the magnetic conductive structure, improves the direction of the magnetic field, makes the tip of the bit more magnetic, and solves the technical problem of the poor adsorption ability of the power tool bit for screws in the prior art. Since the nails are mainly adsorbed by the magnetic field, compared with the existing nail adsorption method, the present invention avoids the wear of the magnet due to direct contact, prolongs the service life of the magnet, and the user's operating field of vision is basically not disturbed by the magnet.

[0021] In the prior art, there is a method of directly adsorbing nails by means of a magnetic ring. However, when encountering a nail with a smaller diameter, the inner hole of the magnetic ring is larger than the outer diameter of the screw head and the screw cannot be adsorbed, or the contact surface of the screw head with the magnetic ring is uneven or cannot be contacted because the screw head is semicircular, resulting in the phenomenon that the screw cannot be straightened. Affected by the diameter of the screwdriver bit, the inner hole diameter of the magnetic ring cannot be less than 7.2 mm, so that the tip of the screwdriver bit can be exposed to drive the screw. Therefore, such an inner hole size of the magnetic ring is not suitable for use with nails with smaller diameters.

[0022] Compared with other strong magnetic connecting rods, the present invention does not rely on the end face of the magnet to absorb the screw plane, so screws of various shapes can be straightened, which is convenient for one-handed operation. Since the magnetic force mainly comes from magnetic field induction, the small-sized hexagonal handle sleeve is also magnetic after being installed on the connecting rod and can absorb the external hexagonal screws, which is convenient for installation and disassembly.

[0023] When a longer bit needs to be replaced, the magnetism of the front end of the bit will not be significantly weakened due to the increase in the length of the bit. The magnetic force of ordinary connecting rods on the market is not strong enough. When using a 1-inch bit, it can barely attract the screws. However, if a 2-inch bit is installed, the magnetic force of the tip of the bit is very weak and cannot attract the screws due to the increase in the distance from the magnetic ring. The connecting rod of the present invention uses a magnetic field induction method, so that the efficiency of magnetic force transmission is much higher than that of ordinary connecting rods. Even if a longer bit is installed, the magnetic force of the tip of the bit is several times higher than that of an ordinary connecting rod, and it is still sufficient to straighten smaller screws. This is very helpful for loading and unloading screws in deeper holes, such as the assembly of electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structure diagram of the present invention;

[0025] Figure 2 is an axial cross-sectional view of the first embodiment of the present invention;

[0026] Figure 3 The present invention does not add a magnetic flux distribution diagram of the magnetic conductive ring;

[0027] Figure 4 This is a distribution diagram of magnetic flux lines of the present invention with the magnetic conductive ring added;

[0028] Figure 5 It is a magnetic flux line distribution diagram in the prior art;

[0029] Figure 6 It is an axial cross-sectional view of the second embodiment of the present invention.

[0030] The meaning of the accompanying numbers: 1-extension rod; 2-magnet; 3-front magnetic ring; 4-rear magnetic ring; 5-tool drive connection end; 6-magnet inside the rod; 7-bit; 31-larger diameter section one; 32-smaller diameter end one; 41-larger diameter section two; 42-smaller diameter section two. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] Embodiment 1

[0033] like Figure 1 and Figure 2 As shown: This embodiment discloses a strong magnetic tool extension rod: including an extension rod 1, a magnet 2 and a magnetic conductive structure. The magnet 2 is symmetrically distributed on the side of the extension rod 1 with the axis of the extension rod 1 as the center. Usually, the magnet is ring-shaped, so it can also be called a permanent magnet ring. The permanent magnet ring is sleeved on the extension rod, and its inner hole is in contact with the outer surface of the extension rod 1.

[0034] The magnetic conductive structure includes a front magnetic conductive structure and a rear magnetic conductive structure respectively arranged on both sides of the magnet. The front magnetic conductive structure and the rear magnetic conductive structure are preferably a front magnetic conductive ring 3 sleeved on the connecting end of the extension rod tool head and a rear magnetic conductive ring 4 sleeved on the connecting end of the extension rod driving tool, and the axial distance between the front magnetic conductive ring 3, the rear magnetic conductive ring 4 and the magnet 2 does not exceed 3mm, usually in a manner of direct end contact.

[0035] The front magnetic conductive structure is arranged at the screw connection end (bit installation end) of the extension rod 1, and the rear magnetic conductive structure is arranged at the tool drive receiving connection end 5 (electric drill clamping end) of the extension rod 1.

[0036] The axial dimension (i.e., length) of the front magnetic ring 3 is greater than the axial dimension of the magnet 2, and the axial dimension of the rear magnetic ring 4 is greater than the axial dimension of the magnet 2. The inner walls of the front magnetic ring 3 and the rear magnetic ring 4 are in contact with the outer surface of the extension rod 1.

[0037] The extension rod 1 is provided with a screwdriver bit connection hole, and an inner rod magnet 6 is provided at the bottom of the screwdriver bit connection hole. The magnetic poles of the inner rod magnet 6 are the same as those of the magnetic ring.

[0038] like Figure 5 As shown, Figure 5It is a magnetic screwdriver bit in the prior art, which attracts the screw to the screwdriver bit through the action of the magnet 6 in the rod. Figure 5 The dotted lines in the figure represent magnetic lines of force. Since the magnetic lines of force are closed curves, although the screwdriver bit 7 can, to a certain extent, distribute the magnetic lines of force as much as possible along the inside of the screwdriver bit 7, the magnet 6 in the rod is far away from the screw, so in actual use, the adsorption effect is poor.

[0039] like Figure 3 As shown, in order to ensure the field of view of the end of the screwdriver bit 7, the magnet 2 should not be too close to the screwdriver bit 7. Therefore, despite the dual effects of the magnet 2 and the magnet 6 in the rod, due to the characteristics of the magnetic lines of force, the magnetism of the end of the screwdriver bit is only slightly greater than that of the end of the screwdriver bit. Figure 5 Enhance the form a little.

[0040] like Figure 4 As shown, relative to Figure 3 , Figure 4 The front magnetic ring 3 and the rear magnetic ring 4 are added. Since the magnetic conductivity of the magnetic ring is much greater than that of air (compared with Figure 3 ), so the front magnetic ring 3 and the rear magnetic ring 4 can stretch the closed magnetic lines of force along the direction of the extension rod 1, which makes the magnetic lines of force passing through the screwdriver bit denser, so the adsorption effect on the screw is stronger.

[0041] Since the magnetism of a magnet does not increase linearly with the increase of its volume, even if the length of the magnet 2 is made very long, the magnetism of its end will not increase with the increase of the length of the magnet 2. Through experiments, after the axial length of the magnet 2 is increased to 5mm, the increase of its end magnetism is also very small. Therefore, even if the front magnetic ring 3, the rear magnetic ring 4, and the magnet 2 are replaced with magnetic rings of equal length, the effect is not significant. Figure 4 The effect is good. Gathering the magnetic lines of force at the end of the screwdriver bit through the magnetic ring can greatly increase the screwdriver bit's ability to absorb the screw.

[0042] On the other hand, the thickness of the magnet 2 is also related to the thickness of the inner magnet 6. Due to the problem of magnetic poles, if the thickness of the magnet 2 is too large, the magnetic pole surface of the inner magnet 6 will be within the range of the opposite magnetic pole surface of the outer magnetic ring (magnet 2). Then, it is possible that the magnetic fluxes of the two magnets cancel each other out, resulting in a phenomenon that the magnetic force at the tip of the screwdriver bit is lower.

[0043] If the length of the screwdriver bit 7 is also regarded as a part of the magnetizer, then according to the principle of symmetrical distribution of the magnetic field and the principle that the magnetic lines of force do not overlap or cross, the length of the rear magnetic conductive ring 4 can indeed better close the magnetic lines of force. The tip of the screwdriver bit will gather the magnetic lines of force more densely, thereby increasing the magnetism of the tip of the screwdriver bit.

[0044] Embodiment 2

[0045] like Figure 6 As shown, compared with the first embodiment, the magnetic conductive structure of this embodiment has undergone some changes, and it is divided into a larger diameter section and a smaller diameter end. Specifically: the front conductive magnetic ring 3 includes a larger diameter section 31 and a smaller diameter end 32, and the conductive magnetic ring 4 includes a larger diameter section 41 and a smaller diameter section 42. The larger diameter section 31 and the smaller diameter section 42 are located at one end close to the magnet 2. In practical applications, the smaller diameter end and the larger diameter end can be a detachable structure. For example, the larger diameter end can adopt a flat washer in the prior art, and the smaller diameter end can be a sleeve, a sleeve with an opening on the side, a spring sheet, or a combination of one or more springs. This has the following advantages: first, it can save product costs; second, the smaller diameter end can make it easier for users to observe the end of the screwdriver bit.

[0046] Compared with the prior art, the present invention guides and gathers the magnetic lines of force to the tip of the screwdriver through a magnetic conductive structure, improves the direction of the magnetic field, makes the tip of the screwdriver stronger in magnetism, and solves the technical problem of poor screw adsorption ability of the electric tool screwdriver in the prior art. Since the nails are mainly adsorbed by the magnetic field, compared with the existing nail adsorption method, the present invention avoids the wear of the magnet caused by direct contact, prolongs the service life of the magnet, and the user's operating field of vision is basically not disturbed by the magnet. Similarly, in the prior art, there are methods of directly adsorbing nails through magnetic rings. When encountering nails with smaller diameters, the inner hole of the magnetic ring is larger than the outer diameter of the screw head, so the screw cannot be adsorbed, or the contact surface of the screw head with the magnetic ring is uneven or cannot be contacted because the screw head is semicircular, causing the phenomenon that the screw cannot be straightened; affected by the diameter of the screwdriver, the inner hole diameter of the magnetic ring cannot be less than 7.2mm, so that the tip of the screwdriver can be exposed to drive the screw, so such a size of the inner hole of the magnetic ring is not suitable for use with nails with smaller diameters.

[0047] Compared with other strong magnetic connecting rods, the present invention does not rely on the end face of the magnet to absorb the screw plane, so screws of various shapes can be straightened, which is convenient for one-handed operation. Since the magnetic force mainly comes from magnetic field induction, the small-sized hexagonal handle sleeve is also magnetic after being installed on the connecting rod and can absorb the external hexagonal screws, which is convenient for installation and disassembly.

[0048] When it is necessary to replace a longer bit 7, the magnetism of the front end of the bit 7 will not be significantly weakened due to the increase in the length of the bit 7. The magnetic force of ordinary connecting rods on the market is not strong enough. When using a 1-inch bit, it can barely attract the screws. However, if a 2-inch bit is installed, the magnetic force of the tip of the bit is very weak and cannot attract the screws due to the increase in the distance from the magnetic ring. The connecting rod of the present invention uses a magnetic field induction method, so that the efficiency of magnetic force transmission is much higher than that of ordinary connecting rods. Even if a longer bit is installed, the magnetic force of the tip of the bit is several times higher than that of an ordinary connecting rod, and it is still sufficient to straighten smaller screws. This is very helpful for loading and unloading screws in deeper holes, such as the assembly of electrical appliances.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A strong magnetic tool extension rod, characterized in that: It comprises an extension rod (1), a magnet (2) and a magnetic conductive structure, wherein the magnet (2) is symmetrically distributed on the side of the extension rod (1) with the axis of the extension rod (1) as the center, and the magnetic conductive structure is arranged on the axial side of the magnet (2).

2. A strong magnetic tool extension rod according to claim 1, characterized in that: The magnetic conductive structure comprises a front magnetic conductive structure and a rear magnetic conductive structure respectively arranged on both sides of the magnet, the front magnetic conductive structure being arranged at the tool head adapter connection end of the extension rod (1), and the rear magnetic conductive structure being arranged at the tool drive receiving connection end (5) of the extension rod (1).

3. The strong magnetic tool extension rod according to claim 1, characterized in that: The magnet is annular and is sleeved on the extension rod. The front magnetic conductive structure is a front magnetic conductive ring (3) sleeved on the tool head connecting end of the extension rod, and the rear magnetic conductive structure is a rear magnetic conductive ring (4) sleeved on the tool driving connecting end of the extension rod.

4. A strong magnetic tool extension rod according to claim 2, characterized in that: The axial length of the leading magnetic ring (3) is greater than the axial length of the magnet, and the axial length of the trailing magnetic ring (4) is greater than the axial length of the magnet (2).

5. A strong magnetic tool extension rod according to any one of claims 1 to 4, characterized in that: The magnet (2) is a magnetic ring, and the inner hole of the magnetic ring is in contact with the outer surface of the extension rod (1).

6. The strong magnetic tool extension rod according to claim 1, characterized in that: The magnetic conductive structure is in multi-point contact or surface contact with the outer surface of the extension rod (1).

7. A strong magnetic tool extension rod according to any one of claims 2 to 4, characterized in that: The inner walls of the front magnetic ring (3) and the rear magnetic ring (4) are both in contact with the outer surface of the extension rod (1).

8. A strong magnetic tool extension rod according to claim 2 or 3, characterized in that: The extension rod (1) is provided with a screwdriver bit connection hole, and the bottom of the screwdriver bit connection hole is also provided with an inner rod magnet (6), and the magnetic pole direction of the inner rod magnet (6) is the same as the magnetic pole direction of the magnetic ring.

9. The strong magnetic tool extension rod according to claim 3, characterized in that: The axial distance between the front magnetic ring (3) and the magnet (2) does not exceed 3 mm, and a non-magnetic structure is provided between the two. The axial distance between the rear magnetic ring (4) and the magnet (2) does not exceed 3 mm, and a non-magnetic structure is provided between the two.

10. A strong magnetic tool extension rod according to any one of claims 1 to 4, characterized in that: The extension rod (1) is made of a non-magnetic material.

11. The strong magnetic tool extension rod according to claim 2, characterized in that: The magnetic conductive structure includes an end with a smaller diameter and an end with a larger diameter, and the end with the larger diameter is closer to the magnet than the end with the smaller diameter.

12. A strong magnetic tool extension rod according to claim 11, characterized in that: The smaller diameter end and the larger diameter end are in a detachable structure.

13. A strong magnetic tool extension rod according to claim 11 or 12, characterized in that: The end with a smaller diameter is one or more combinations of a sleeve, a sleeve with an opening on the side, a spring, and a spring sheet.

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