Screwdriver connecting rod

Abstract

The utility model provides a screw driver connecting rod which comprises a body and a lining which do not have the magnetic conduction characteristic, and a fixing seat, a mandrel, a magnet and a connecting rod which have the magnetic conduction characteristic. The body comprises a polygonal hole forming the front end of the body; an assembly hole is formed in the rear end of the body and communicated with the polygonal hole. The connecting rod is fixed in the assembling hole and extends out of the rear end of the body. The lining, the fixing seat and an elastic piece are jointly arranged in the assembling hole. The bushing is provided with a caulking groove and a hole which are communicated with each other. And the fixed seat is provided with a through hole. One end of the elastic piece enables the fixing base to make contact with the connecting rod, and the other end of the elastic piece drives the lining to move towards the polygonal hole to be in a normal state. The mandrel is partially fixed to the hole, and the rest of the mandrel extends into the through hole. And the magnet is embedded into the embedding groove to form a movable closed end in the polygonal hole, the magnet is in contact with the mandrel, and the magnetic force of the magnet is conducted to the connecting rod through the fixed seat.

Description

Technical Field

[0001] This utility model relates to an extension technology of magnetic adsorption, applicable to the field of a tool being coupled to a screwdriver tip via a screwdriver extension rod. Background Technology

[0002] Taiwanese patent No. TWM308146 discloses an adapter structure including: a connecting rod body, a sliding sleeve, a magnet, an inner spring, and a plug. A polygonal fitting hole is inserted into one end of the connecting rod body, and a through hole extends into the other end of the connecting rod body; the through hole and the fitting hole communicate with each other. The plug, a polygonal cylinder, is inserted into the through hole and remains stationary, thus becoming part of the connecting rod body. The magnet is embedded in the sliding sleeve, and the sliding sleeve and the inner spring are placed in the through hole. One end of the inner spring resists the plug, and the other end pushes against the sliding sleeve, driving the magnet to move towards the polygonal fitting hole as a normal state.

[0003] Normally, the inner spring separates the sliding sleeve and the insert rod, making it difficult for the magnet to attract the insert rod.

[0004] When a screwdriver tip is partially inserted into the polygonal socket, the magnet attracts the end of the tip. Simultaneously, the sliding sleeve retracts into the through hole, compressing the inner spring and maintaining a distance between the sliding sleeve and the insert. The magnet does not attract the insert, and magnetic force cannot be conducted to it. Utility Model Content

[0005] In view of this, the main purpose of this utility model is to provide a screwdriver extension rod that provides a connecting structure for a magnet, so as to achieve the effect of magnetic force being conducted to the outside of the screwdriver extension rod in the area where the tool is connected to the screwdriver head.

[0006] To achieve the above objectives, this utility model provides a screwdriver extension rod, characterized in that it comprises:

[0007] A body that does not have magnetic properties includes: a polygonal hole forming the front end of the body; and an assembly hole forming the rear end of the body, the assembly hole communicating with the polygonal hole.

[0008] A connecting rod is fixed to the assembly hole and extends out from the rear end of the body;

[0009] A bushing that is not magnetically conductive has a slot and a hole that communicate with each other, and the bushing is inserted into the assembly hole;

[0010] A mounting base having a through hole, the mounting base being inserted into the assembly hole;

[0011] An elastic element is inserted into the assembly hole, one end of which causes the fixing seat to contact the connecting rod, and the other end of which drives the bushing to move toward the polygonal hole under normal conditions;

[0012] A mandrel, partially fixed to a hole in the bushing, the remainder of which extends into the through-hole; and

[0013] A magnet is embedded in the groove, and the magnet becomes a movable closed end inside the polygonal hole. The magnet contacts the mandrel, and the magnetic force of the magnet is transmitted to the connecting rod through the fixing seat.

[0014] In a preferred embodiment, the fixing seat and the connecting rod are an integral structure, and the through hole of the fixing seat extends into the connecting rod.

[0015] To make the objectives, features and advantages of this utility model readily understandable, one or more preferred embodiments are listed below, and described in detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a perspective view of a preferred embodiment of the screwdriver extension rod of this utility model.

[0017] Figure 2 This is an exploded 3D view of the screwdriver extension.

[0018] Figure 3 This diagram illustrates the internal structure of the screwdriver before the connecting rod is engaged.

[0019] Figure 4 To present the internal structure of the screwdriver before the connecting rod is engaged from different angles.

[0020] Figure 5 The figure shows the internal structure of the screwdriver after the connecting rod has been engaged.

[0021] Figure 6 This diagram shows the internal structure of the screwdriver lever after it has been engaged, viewed from different angles.

[0022] Explanation of reference numerals in the attached drawings: Magnet 10; Bushing 11; Groove 12; Hole 13; Cylinder 14; Mandrel 15; Fixing base 16; Through hole 17; Small diameter section 18; Elastic element 19; Screwdriver extension 20; Connecting rod 21; Body 22; Polygonal hole 23; Locking hole 24; Assembly hole 25; Positioning hole 26; Locking ball 27; Positioning ball 28; Shoulder 29; Control button 30; Through hole 31; Spring groove 32; Conical surface 33; Ring surface 34; Compression spring 35; Blocking part 36; Screwdriver head 37; Locking part 38. Detailed Implementation

[0023] Next, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar structures or units. It is to be understood that the embodiments described are only examples of some aspects of the present invention, and not all of the embodiments. Other embodiments can be deduced based on the described examples, or the construction can be modified or changed as needed, all of which fall within the scope of protection of the present invention.

[0024] In the following description, directional terms such as "up," "down," "left," "right," "front," "back," "inner," "outer," and "side" are used only for reference to the directions in the accompanying drawings. The use of directional terms is for the purpose of better and clearer description and understanding of this utility model, and does not imply that the described device or element must have a specific orientation, structure, or operation, and therefore should not be construed as a limitation on the technical content of this utility model.

[0025] Unless specifically and explicitly stated otherwise, in the following description, "installed," "connected," "attached," or "on" should be interpreted broadly, including, for example, fixed connection, detachable connection, integral connection, mechanical connection, direct connection, indirect connection, or connection between two components. Those skilled in the art will understand the specific meaning of these terms in the various embodiments and even in the context of this invention based on ordinary knowledge or experience.

[0026] Unless otherwise stated, in the following description, "multiple" means two or more. As shown in the figure, this utility model provides a screwdriver extension rod, including:

[0027] A body that does not have magnetic properties includes: a polygonal hole forming the front end of the body; and an assembly hole forming the rear end of the body, the assembly hole communicating with the polygonal hole.

[0028] A connecting rod that secures the assembly hole extends out from the rear end of the body;

[0029] A bushing that is not magnetically conductive has a slot and a hole that communicate with each other, and the bushing is inserted into the assembly hole;

[0030] A mounting base having a through hole, the mounting base being inserted into the assembly hole;

[0031] An elastic element is inserted into the assembly hole, one end of which causes the fixing seat to contact the connecting rod, and the other end of which normally drives the bushing to move into the polygonal hole;

[0032] A mandrel, partially fixed to the hole, the remainder of which extends into the through hole; and

[0033] A magnet is embedded in the slot, the magnet becoming a movable closed end inside the polygonal hole, the magnet contacting the mandrel, and the magnetic force of the magnet being conducted to the connecting rod through the fixing seat.

[0034] like Figure 1 As shown in the preferred embodiment of this utility model, a screwdriver extension 20 has a control button 30 at one front end, and a connecting rod 21 extends from one rear end of the screwdriver extension 20. Along the length of the screwdriver extension 20, the control button 30 reciprocates relative to a body 22, determining a screwdriver tip 37 (see [reference]). Figure 6 (As shown) It is detachable by combining a polygonal hole 23 with the body 22.

[0035] like Figure 2 As shown, the screwdriver extension 20 removes the connecting rod 21, and the body 22 can be fitted with a magnet 10, a bushing 11, a spindle 15, a fixing seat 16 and an elastic element 19.

[0036] like Figure 4 As shown, the body 22 is a tube. The polygonal hole 23 is inserted into the front end of the body 22 and leads to the rear end of the body 22 through an assembly hole 25. The assembly hole 25 is a circular hole. One diameter of the assembly hole 25 is smaller than the distance between opposite corners of the polygonal hole 23, and the diameter of the assembly hole 25 is larger than the distance between opposite sides of the polygonal hole 23. Therefore, the body 22 has a plurality of blocking portions 36, which are adjacent to each side of the polygonal hole 23 and the wall of the assembly hole 25. Along a radial direction of the body 22, the body 22 forms a locking hole 24 and a positioning hole 26. The locking hole 24 extends from one corner (unlabeled) of the polygonal hole 23 to the outside of the body 22. The positioning hole 26 connects the outer surface of the body 22 to the part where the polygonal hole 23 intersects with the assembly hole 25. A shoulder 29 is formed on the outer surface of the body 22 due to the diameter difference, and the shoulder 29 presents a toroidal surface.

[0037] The connecting rod 21 is a hexagonal prism. The diagonal distance of the connecting rod 21 is slightly larger than the diameter of the assembly hole 25 to partially block the assembly hole 25, thereby securing the connecting rod 21 to the body 22. The remainder of the connecting rod 21 extends beyond the rear end of the body 22 and is detachably coupled to a receiving end of a tool (not shown), such as a hand tool, pneumatic tool, or power tool.

[0038] In this embodiment, the elastic element 19 is a compression spring. One end of the elastic element 19 is fitted with a cylinder 14 of the bushing 11, and the other end of the elastic element 19 is fitted with a small diameter segment 18 of the fixing seat 16.

[0039] When the assembly hole 25 receives the bushing 11, the fixing seat 16, and the elastic member 19, a force from the connecting rod 21 acts on the fixing seat 16, counteracting the elastic force of the elastic member 19 pressing against the fixing seat 16. The fixing seat 16 remains stationary, resisting the end face of the connecting rod 21. The bushing 11 receives the elastic force of the elastic member 19 and normally moves towards the polygonal hole 23. The blocking part 36 blocks the end face of the bushing 11, preventing the bushing 11 from popping out of the body 22.

[0040] The magnet 10 is embedded in a groove 12 of the bushing 11, and the groove 12 and the cylinder 14 are at both ends of the bushing 11. When the bushing 11 is inserted into the assembly hole 25, the magnet 10 becomes a movable closed end inside the polygonal hole 23.

[0041] The mandrel 15 partially secures a hole 13 in the bushing 11, which connects to the groove 12, allowing the magnet 10 to contact the mandrel 15. When the bushing 11 is inserted into the assembly hole 25, the remaining portion of the mandrel 15 extends out of the cylinder 14, thereby entering a through hole 17 in the mounting base 16. The through hole 17 connects to the mounting base 16 via the small-diameter section 18.

[0042] In this embodiment, the bushing 11 and the body 22 are made of non-magnetic materials, such as austenitic stainless steel with a high chromium (Cr) content, designated 302 or 304. Therefore, the bushing 11 and the body 22 do not possess magnetic properties. The spindle 15, the mounting base 16, and the connecting rod 21 are identical to the screwdriver bit 37 (see [link to documentation]). Figure 6 All of the components shown are made of ferromagnetic materials, such as iron (Fe), nickel (Ni), cobalt (Co), and such metal alloys. Therefore, the spindle 15, the fixing seat 16, and the connecting rod 21 have magnetic properties.

[0043] According to the first law of magnetism, opposite poles attract and like poles repel. If one south pole (S) of the magnet 10 attracts one north pole (N) of the spindle 15, or the north pole (N) of the magnet 10 attracts the south pole (S) of the spindle 15, the spindle 15 can be converted into another magnet. Then, the magnetic field of the spindle 15 can magnetize the mounting base 16, causing the south pole (S) of the mounting base 16 to attract the north pole (N) of the connecting rod 21, or vice versa. In this way, the connecting rod 21 magnetically attracts the receiving end of the tool.

[0044] like Figure 6As shown, the screwdriver bit 37 engages with the polygonal hole 23. The magnet 10 attracts the screwdriver bit 37, which penetrates the end face of the polygonal hole 23, causing the bushing 11 to move toward the connecting rod 21. The bushing 11 approaches the fixing base 16, compressing the volume of the elastic member 19. The spindle 15 penetrates the through hole 17, continuing to magnetize the fixing base 16. The fixing base 16 magnetically attracts the connecting rod 21, and the connecting rod 21 maintains its magnetic force.

[0045] Please refer to the following: Figure 2 As shown, the control button 30 is removed from the body 22, and two steel balls and another compression spring 35 with a larger diameter are removed from the outside of the body 22. For clarity of the structure, the two steel balls are defined as the locking steel ball 27 and the positioning steel ball 28.

[0046] Among them, a circular hole in the control button 30 is regarded as a through hole 31. The wall of the through hole 31 is recessed into a spring groove 32. One end of the spring groove 32 forms a conical surface 33, and the other end of the spring groove 32 forms an almost vertical annular surface 34.

[0047] like Figure 3 As shown, when the control button 30 is fitted onto the outside of the body 22, the annular surface 34 is relatively close to the shoulder 29, thus compressing the volume of the compression spring 35. The compression spring 35 is also fitted onto the outside of the body 22. In addition, the spring groove 32 receives the locking ball 27, which freely enters and exits the locking hole 24.

[0048] like Figure 4 As shown, although the bushing 11 is obstructed by the blocking part 36 and will not pop out of the body 22, the outer circumferential surface of the bushing 11 blocks the positioning hole 26, allowing the positioning hole 26 to receive the positioning ball 28. One end of the positioning ball 28 contacts the bushing 11, and the other end of the positioning ball 28 protrudes from the outer surface of the body 22, thereby resisting the end of the control button 30. Thus, the force of the body 22 acts on the positioning ball 28, counteracting the force output by the compression spring 35 through the control button 30, so the control button 30 remains stationary on the body 22.

[0049] from Figure 6 As can be easily understood, the magnet 10, inside the polygonal hole 23, shifts in response to the continuously penetrating screwdriver bit 37. Then, the bushing 11 moves toward the connecting rod 21, no longer blocking the positioning hole 26, and naturally can no longer support the positioning ball 28. The compression spring 35 returns to its original state, releasing its elastic force, which drives the control button 30 to move relative to the body 22. The control button 30 blocks one opening of the positioning hole 26, allowing the positioning ball 28 to protrude into the body 22 through the other opening of the positioning hole 26. The end face of the bushing 11 is obstructed by the positioning ball 28, counteracting the force exerted on the bushing 11 by the elastic element 19.

[0050] like Figure 5 As shown, the conical surface 33 pushes the locking steel ball 27 partially protruding from the polygonal hole 23, locking one of the multiple locking portions 38 forming the exterior of the screwdriver bit 37, preventing the screwdriver bit 37 from disengaging from the front end of the body 22. At this moment, the magnet 10 magnetically attracts the screwdriver bit 37, and the screwdriver bit 37 becomes another magnet, magnetically attracting a fastener (not shown), such as a bolt, stud, or screw.

[0051] In some embodiments, the mounting base 16 and the connecting rod 21 are designed as one piece. The through hole 17 extends into the connecting rod 21. The spindle 15 extends into the through hole 17 to magnetize the mounting base 16 and the connecting rod 21 without affecting the magnetic conductivity.

[0052] Without departing from the broad concept of this utility model, those skilled in the art will understand and be able to modify the embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed in the specification. For example, any modifications made in accordance with the spirit and technical scope of this utility model should be covered and protected by the textual content defined by this utility model.

Claims

1. A screwdriver extension rod, characterized in that, include: A body that does not have magnetic properties includes: a polygonal hole forming the front end of the body; and an assembly hole forming the rear end of the body, the assembly hole communicating with the polygonal hole. A connecting rod is fixed to the assembly hole and extends out from the rear end of the body; A bushing that is not magnetically conductive has a slot and a hole that communicate with each other, and the bushing is inserted into the assembly hole; A mounting base having a through hole, the mounting base being inserted into the assembly hole; An elastic element is inserted into the assembly hole, one end of which causes the fixing seat to contact the connecting rod, and the other end of which drives the bushing to move toward the polygonal hole under normal conditions; A mandrel, partially fixed to a hole in the bushing, the remainder of which extends into the through-hole; and A magnet is embedded in the groove, and the magnet becomes a movable closed end inside the polygonal hole. The magnet contacts the mandrel, and the magnetic force of the magnet is transmitted to the connecting rod through the fixing seat.

2. The screwdriver extension rod as described in claim 1, characterized in that, The fixing seat and the connecting rod are an integral structure, and the through hole of the fixing seat extends into the connecting rod.

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