Combined multi-head screwdriver

Abstract

The utility model belongs to the hardware tool technical field discloses a combined multi -head screwdriver, including a plurality of along length direction detachable connection's screwdriver single body, every screwdriver single body includes the head and the body, the body is connected in the head along the length direction one end, and the other end is provided with the insertion cavity, the outer surface of body is provided with the convex head, the inner wall of insertion cavity is provided with the intercommunication guide groove and locking groove, locking groove extends along the body axial direction, guide groove extends along the direction of deviating from the body axial direction and meets with locking groove; When the body of the last screwdriver single body is inserted into the insertion cavity of the former screwdriver single body, the convex head of the last screwdriver single body can slide into locking groove along the guide groove of the former screwdriver single body. The utility model can realize quick, nondestructive dismounting while ensuring the connecting strength and the anti -torque ability.

Description

Technical Field

[0001] This utility model relates to the field of hardware tool technology, and in particular to a combination multi-head screwdriver. Background Technology

[0002] In various work scenarios such as mechanical repair and home installation, screwdrivers are core fastening and disassembly tools, and their ease of use and applicability directly affect work efficiency. Traditional interlocking screwdrivers mainly consist of multiple screwdriver units that can be plugged into each other. These units form a complete screwdriver structure through interference fit, enabling flexible switching between various bit types. This has been widely used in daily light-duty work. However, relying solely on interference fit, the connection strength between the individual screwdriver units is weak. When the screwdriver is used in applications with high torque, radial slippage may occur between the individual screwdriver units, affecting its use.

[0003] Therefore, there is an urgent need to develop a combination multi-head screwdriver to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a combined multi-head screwdriver that, while ensuring connection strength and torque resistance, enables quick and non-destructive assembly and disassembly.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A modular multi-head screwdriver includes multiple screwdriver units that are detachably connected sequentially along a length direction, each screwdriver unit comprising:

[0007] Blade tip;

[0008] The blade body has one end connected to the blade head along its length and the other end has a insertion cavity. The outer surface of the blade body has a protrusion. The inner wall of the insertion cavity has a connecting guide groove and a locking groove. The locking groove extends along the axial direction of the blade body, and the guide groove extends in a direction deviating from the axial direction of the blade body and merges with the locking groove.

[0009] When the blade of the latter screwdriver unit is inserted into the insertion cavity of the former screwdriver unit, the protrusion of the latter screwdriver unit can slide into the locking groove along the guide groove of the former screwdriver unit.

[0010] Preferably, the blade body includes a connected insertion portion and a gripping portion, and the blade tip is connected to the end of the insertion portion away from the gripping portion; when the blade body of the subsequent screwdriver unit is inserted into the insertion cavity of the preceding screwdriver unit, the insertion portion of the subsequent screwdriver unit is at least partially located within the insertion cavity of the preceding screwdriver unit.

[0011] Preferably, the insertion part is cylindrical, and the guide groove extends spirally from the groove of the insertion cavity around the axis of the blade body.

[0012] Preferably, the insertion part is cylindrical, and the guide groove extends from the slot of the insertion cavity and bends radially to communicate with the locking groove.

[0013] Preferably, the locking groove extends toward the cutting head, and when the protrusion of the subsequent screwdriver unit slides into the locking groove of the preceding screwdriver unit, the insertion portion of the subsequent screwdriver unit is entirely located within the insertion cavity of the preceding screwdriver unit, and the grip portion of the subsequent screwdriver unit abuts against the grip portion of the preceding screwdriver unit.

[0014] Preferably, the outer surface of the blade is provided with a plurality of protrusions spaced apart circumferentially, and the end of the gripping part facing the insertion part is provided with a retraction cone surface, the outer diameter of which gradually decreases in the direction toward the insertion part.

[0015] Preferably, a guide head is provided at one end of the blade body near the blade tip, and the outer diameter of the guide head gradually decreases in the direction toward the blade tip.

[0016] Preferably, the outer surface of the blade body is provided with a plurality of protrusions spaced apart in a circumferential manner, and the groove wall of the insertion cavity is provided with a plurality of guide grooves and a plurality of locking grooves.

[0017] Preferably, the extension trajectory of the guide groove is an arc convex towards the cutter head.

[0018] Preferably, the cutting head is detachably connected to the cutting body.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a modular multi-head screwdriver. When the blade of the subsequent screwdriver unit is inserted into the insertion cavity of the preceding screwdriver unit, its outer protrusion first enters the guide groove. Since the guide groove extends in a direction deviating from the axial direction, the user needs to apply a rotational torque during insertion, forcing the protrusion to slide along this inclined or circumferential trajectory into the locking groove that extends completely axially. Once the protrusion enters the locking groove, the two screwdriver units are completely constrained radially, preventing relative rotation or sliding, thus ensuring operational stability and effective force application. Furthermore, the entire process requires no tools and can be completed quickly with one hand, resulting in high assembly efficiency. The protrusion moves smoothly along the groove throughout the process, avoiding hard snap-locking and damage caused by drastic stress changes. After connection, the modular multi-head screwdriver has no protruding or separable parts on the outside, providing a comfortable grip. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the combined multi-head screwdriver described in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the screwdriver unit described in this embodiment of the utility model;

[0023] Figure 3 This is a cross-sectional view of the screwdriver unit described in this embodiment of the utility model;

[0024] Figure 4 This is a cross-sectional view of two screwdriver units connected together, as described in an embodiment of this utility model.

[0025] In the picture:

[0026] 1. Blade head;

[0027] 2. Tool body; 20. Insertion cavity; 201. Guide groove; 202. Locking groove; 21. Insertion part; 211. Protrusion head; 212. Guide head; 22. Holding part; 221. Retracting cone surface. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1-4 As shown, this utility model provides a combined multi-head screwdriver, comprising multiple screwdriver units that are detachably connected in sequence along the length direction. Each screwdriver unit includes a head 1 and a body 2. One end of the body 2 is connected to the head 1 along the length direction, and the other end has an insertion cavity 20. The outer surface of the body 2 is provided with a protrusion 211. The inner wall of the insertion cavity 20 has a communicating guide groove 201 and a locking groove 202. The locking groove 202 extends along the axial direction of the body 2, and the guide groove 201 extends in a direction deviating from the axial direction of the body 2 and intersects with the locking groove 202. When the body 2 of the subsequent screwdriver unit is inserted into the insertion cavity 20 of the previous screwdriver unit, the protrusion 211 of the subsequent screwdriver unit can slide into the locking groove 202 along the guide groove 201 of the previous screwdriver unit.

[0033] When the blade 2 of the subsequent screwdriver unit is inserted into the insertion cavity 20 of the preceding screwdriver unit, the protrusion 211 on its outer surface first enters the guide groove 201. Since the guide groove 201 extends in a direction deviating from the axial direction, the user needs to apply a rotational torque during insertion, forcing the protrusion 211 to slide along this inclined or circumferential trajectory into the locking groove 202, which extends completely along the axial direction. Once the protrusion 211 enters the locking groove 202, the two screwdriver units are completely constrained radially, preventing relative rotation or sliding, thus ensuring operational stability and effective force application. Furthermore, the entire process requires no tools and can be completed quickly with one hand, resulting in high assembly efficiency. The protrusion 211 moves smoothly along the groove throughout the process, avoiding hard snap-locking and damage caused by drastic stress changes. After connection, the combination multi-head screwdriver has no protruding or separable parts on the outside, providing a comfortable grip.

[0034] Specifically, such as Figure 1 and Figure 2As shown, the blade body 2 includes a connected insertion portion 21 and a grip portion 22, with the blade tip 1 connected to the end of the insertion portion 21 away from the grip portion 22. When the blade body 2 of a subsequent screwdriver unit is inserted into the insertion cavity 20 of a preceding screwdriver unit, the insertion portion 21 of the subsequent screwdriver unit is at least partially located within the insertion cavity 20 of the preceding screwdriver unit. The grip portion 21 and the insertion portion 22 have clearly defined functions. The insertion portion 21, as a structure specifically designed for insertion into the insertion cavity of the preceding unit, can be specifically designed in terms of size and shape to ensure a tight fit with the inner wall of the insertion cavity 20. The grip portion 22 can be ergonomically designed with anti-slip textures, a suitable diameter, or a special shape to improve hand comfort.

[0035] Optionally, the insertion part 21 is cylindrical, and the guide groove 201 extends spirally from the slot of the insertion cavity 20 around the axis of the screwdriver body 2. The cylindrical insertion part 21 fits against the inner wall of the insertion cavity 20, forming a coaxial positioning effect, ensuring that the axes of the front and rear screwdriver units are completely coincident; the extension trajectory of the spiral guide groove 201 matches the torque transmission direction during operation. When splicing, it is only necessary to gently rotate along the spiral direction and push in the next screwdriver unit, and the protrusion 211 can slide into the locking groove 202 along the guide groove 201 to complete the locking operation. At the same time, the spiral structure can lock the protrusion 211 with the help of a "self-locking effect" similar to a thread, resist the torque generated during operation, prevent the protrusion 211 from coming out of the locking groove 202, and further ensure the connection reliability in high torque scenarios.

[0036] Optionally, the insertion part 21 is cylindrical, and the guide groove 201 extends from the slot of the insertion cavity 20 and bends radially to communicate with the locking groove 202. The radial bending can form a circumferential limit on the protrusion 211, preventing radial sliding between individual screwdriver units.

[0037] More specifically, such as Figure 3 As shown, the extension trajectory of the guide groove 201 is an arc convex towards the cutter head 1. This causes the axial preload converted from the rotational force to gradually increase with the rotation angle as the protruding head 211 slides along the guide groove 201, creating a progressive locking effect that tightens as it rotates, thereby further increasing connection stability. The locking groove 202 can extend towards the cutter head 1 to form an upward locking, or it can extend away from the cutter head 1 to form a downward locking.

[0038] More specifically, the locking groove 202 extends towards the screwdriver head 1. When the protrusion 211 of the subsequent screwdriver unit slides into the locking groove 202 of the preceding screwdriver unit, the insertion portion 21 of the subsequent screwdriver unit is entirely located within the insertion cavity 20 of the preceding screwdriver unit, and the grip portion 22 of the subsequent screwdriver unit abuts against the grip portion 22 of the preceding screwdriver unit. By setting the locking groove 202 to extend towards the screwdriver head 1, the insertion portion 21 of the subsequent screwdriver unit is completely submerged within the insertion cavity 20 of the preceding screwdriver unit, achieving complete concealment of the connection structure, avoiding the leverage effect caused by the exposed insertion portion 21, and enhancing the bending strength of the connection point; furthermore, the grip portion 22 of the subsequent screwdriver unit can abut against the end face of the grip portion 22 of the preceding screwdriver unit, which not only clearly defines the final insertion depth of the subsequent screwdriver unit, but also further improves the overall integrity and operating feel of the combination multi-head screwdriver.

[0039] More specifically, such as Figure 2 As shown, the grip 22 has a prism structure. By making the grip 22 a prism, the friction when tightening screws is increased, ensuring a stable and non-slip feel when applying force. This ensures that the applied rotational force is fully converted into tightening or loosening torque of the screw, which not only improves work efficiency but also enhances the reliability of tool use.

[0040] In this embodiment, the gripping part 22 is a regular hexagonal prism.

[0041] In other embodiments, the grip portion 22 may also be a regular square prism. The shape of the grip portion 22 is not specifically limited here and can be flexibly adjusted according to the actual situation.

[0042] More specifically, such as Figure 2 As shown, the end of the gripping part 22 facing the insertion part 21 is provided with a retraction cone surface 221, and the outer diameter of the retraction cone surface 221 gradually decreases in the direction towards the insertion part 21. When the end faces of the two gripping parts 22 are tightly abutted, the retraction cone surface 23 forms a non-contact annular gap between the two parts. This gap can avoid the phenomenon of "seizing" or "sticking" between the two precision-fitting planes due to excessive tightness, making the disassembly process easy and effortless.

[0043] Specifically, such as Figure 1 and Figure 2As shown, a guide head 212 is provided at the end of the cutter body 2 near the cutter head 1. The outer diameter of the guide head 212 gradually decreases in the direction towards the cutter head 1. When assembling two screwdriver units, the guide head 212 of the latter unit will contact the slot of the insertion cavity 20 of the former screwdriver unit before the protrusion 211. Its tapered surface can automatically compensate for minor alignment deviations, guiding the insertion part 21 into the correct axial and radial position like a funnel. This avoids damage to the protrusion 211 and the slot of the guide groove 201 caused by bumping or misalignment at the entrance, as well as the resulting connection jamming problem.

[0044] Specifically, the outer surface of the screwdriver body 2 is provided with multiple protrusions 211 spaced circumferentially, and the groove wall of the insertion cavity 20 is provided with multiple guide grooves 201 and multiple locking grooves 202. The cooperation between the multiple protrusions 211 and the locking grooves 202 allows the torque and axial force to be evenly distributed and transmitted, further improving the maximum torque and bending stiffness that the connection part can withstand. Secondly, the multiple sets of cooperation structures enable the multiple protrusions 211 to automatically correct the axis of the two screwdriver units during screwing, preventing wobble and shaking caused by misalignment, and further ensuring the overall rigidity and stability of the combined multi-head screwdriver.

[0045] In this embodiment, three protrusions 211 are evenly spaced around the outer surface of the blade body 2.

[0046] In other embodiments, two protrusions 211 are evenly spaced around the outer surface of the blade body 2. The number of protrusions 211 is not specifically limited here and can be flexibly set according to the actual situation.

[0047] Specifically, the cutting head 1 is detachably connected to the screwdriver body 2. When a commonly used cutting head 1 wears out due to long-term use, the user does not need to replace the entire screwdriver unit, but only needs to replace the single low-cost cutting head 1, thereby reducing long-term maintenance and usage costs.

[0048] In this embodiment, the tail of the cutter head 1 is engaged with the end of the cutter body 2.

[0049] In other embodiments, an external thread is machined at the tail of the cutter head 1, and a matching internal thread is opened at the end of the cutter body 2. A stable connection between the cutter head 1 and the cutter body 2 can be achieved by screwing. This method has a simple structure and high connection strength.

[0050] In this example, the specifications of the blades 1 of the multiple screwdriver units are not exactly the same. Users can freely select and combine screwdriver units with different specifications, such as Phillips, slotted, and hex heads 1, according to their work needs, to assemble a special combination multi-head screwdriver for specific screws. This improves the portability of the tool and the flexibility of the operation. This set of combined tools can handle most fastening scenarios, reducing the number of tools and the total weight, and achieving a balance between functionality, efficiency, and convenience.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A modular multi-head screwdriver, comprising multiple screwdriver units that are detachably connected sequentially along their length, characterized in that... Each of the aforementioned screwdriver units includes: Blade (1); The blade body (2) is connected to the blade head (1) at one end along its length and has a insertion cavity (20) at the other end. The outer surface of the blade body (2) is provided with a protrusion (211). The inner wall of the insertion cavity (20) is provided with a connecting guide groove (201) and a locking groove (202). The locking groove (202) extends along the axial direction of the blade body (2), and the guide groove (201) extends in a direction deviating from the axial direction of the blade body (2) and intersects with the locking groove (202). When the blade (2) of the latter screwdriver unit is inserted into the insertion cavity (20) of the former screwdriver unit, the protrusion (211) of the latter screwdriver unit can slide into the locking groove (202) along the guide groove (201) of the former screwdriver unit.

2. The combined multi-head screwdriver according to claim 1, characterized in that, The blade body (2) includes a connected insertion part (21) and a gripping part (22), and the blade tip (1) is connected to the end of the insertion part (21) away from the gripping part (22); when the blade body (2) of the latter screwdriver unit is inserted into the insertion cavity (20) of the former screwdriver unit, the insertion part (21) of the latter screwdriver unit is at least partially located in the insertion cavity (20) of the former screwdriver unit.

3. The combined multi-head screwdriver according to claim 2, characterized in that, The insertion part (21) is cylindrical, and the guide groove (201) extends spirally from the groove of the insertion cavity (20) around the axis of the blade body (2).

4. The combined multi-head screwdriver according to claim 2, characterized in that, The plug-in portion (21) is cylindrical, and the guide groove (201) extends from the slot of the plug-in cavity (20) and bends radially to communicate with the locking groove (202).

5. The combined multi-head screwdriver according to claim 3 or 4, characterized in that, The locking groove (202) extends toward the blade head (1). When the protrusion (211) of the subsequent screwdriver unit slides into the locking groove (202) of the preceding screwdriver unit, the insertion part (21) of the subsequent screwdriver unit is entirely located in the insertion cavity (20) of the preceding screwdriver unit, and the gripping part (22) of the subsequent screwdriver unit abuts against the gripping part (22) of the preceding screwdriver unit.

6. The combined multi-head screwdriver according to claim 2, characterized in that, The gripping part (22) is provided with a retraction cone surface (221) at one end facing the insertion part (21), and the outer diameter of the retraction cone surface (221) gradually decreases in the direction toward the insertion part (21).

7. The combined multi-head screwdriver according to claim 1, characterized in that, A guide head (212) is provided at one end of the blade body (2) near the blade head (1), and the outer diameter of the guide head (212) gradually decreases in the direction toward the blade head (1).

8. The combined multi-head screwdriver according to claim 1, characterized in that, The outer surface of the blade body (2) is provided with a plurality of protrusions (211) spaced apart in a circumferential manner, and the groove wall of the insertion cavity (20) is provided with a plurality of guide grooves (201) and a plurality of locking grooves (202).

9. The combined multi-head screwdriver according to claim 4, characterized in that, The extension trajectory of the guide groove (201) is an arc convex toward the cutter head (1).

10. The combined multi-head screwdriver according to claim 1, characterized in that, The cutting head (1) is detachably connected to the cutting body (2).

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