Octagonal driver

Abstract

The utility model discloses a kind of octagonal sockets, it is related to the technical field of socket, including transition connecting rod, working end, micro convex tooth, the top of transition connecting rod is provided with tool connecting part, the bottom of transition connecting rod is provided with working end, the outside of transition connecting rod is provided with auxiliary mechanism, auxiliary mechanism is wrapped according to the output interface of electric or pneumatic by soft rubber sleeve and hard rubber sleeve, while using annular magnetic stripe to the magnetic attraction positioning of output interface, the bottom of working end is provided with threaded peg, each sidewall of working end central position is provided with micro convex tooth.Auxiliary mechanism is wrapped to the electric tool output shaft interface or pneumatic tool quick-change connector by the combination structure of soft rubber sleeve and hard rubber sleeve, wherein soft rubber sleeve adopts elastomer material, and the gap of output interface and auxiliary mechanism is filled by radial compression deformation, realizes dustproof seal, vibration buffering and small tolerance compensation, improves the stability of docking.

Description

Technical Field

[0001] This utility model relates to the technical field of screwdriver bits, specifically to an octagonal screwdriver bit. Background Technology

[0002] Octagonal screwdriver bits, as core components of manual / power tools, are closely related to the standardization process of mechanical manufacturing after the Industrial Revolution. However, due to their high torque transmission capacity and anti-slip performance, octagonal slots have gradually become the mainstream choice for heavy-duty scenarios.

[0003] Existing screwdriver bits rely solely on the surface contact between the main octagonal sidewall and the screw slot to transmit torque, with friction entirely dependent on the normal pressure and surface roughness of the contact surface. During high-torque operation, insufficient local pressure or micro-slippage can easily cause the bit to detach from the screw slot or result in "free-spinning and slippage," which not only affects operating efficiency but may also cause personal injury or workpiece damage due to sudden loss of control of the bit. Summary of the Invention

[0004] The purpose of this invention is to provide an octagonal bit to solve the aforementioned defects caused by the prior art.

[0005] An octagonal screwdriver bit includes a transition link, a working end, micro-protruding teeth, and an annular magnetic strip. A tool connection part is provided directly above the transition link, and the working end is provided directly below the transition link. An auxiliary mechanism is provided on the outside of the transition link. The auxiliary mechanism wraps the electric or pneumatic output interface with a soft rubber sleeve and a hard rubber sleeve, and uses the annular magnetic strip to magnetically position the output interface. A threaded pin is provided directly below the working end, and micro-protruding teeth are provided at the center of each side wall of the working end.

[0006] Preferably, the auxiliary mechanism includes a soft rubber sleeve, a rubber pad, a hard rubber sleeve, an annular magnetic strip, rubber teeth, and a through hole. The axial top end of the soft rubber sleeve is fixedly attached to the bottom end face of the hard rubber sleeve, and the bottom end face of the soft rubber sleeve is completely attached to the upper end face of the rubber pad. The rubber pad and the soft rubber sleeve have a through hole through their central axis. The outer peripheral sidewall of the rubber pad has several annular rubber teeth evenly distributed along the circumferential direction. The inner wall of the hard rubber sleeve is fixed to the annular magnetic strip by a high-temperature resistant adhesive.

[0007] Preferably, the rubber pad forms an interference fit mechanical engagement contact with the cylindrical outer wall of the transition connecting rod by a plurality of annular rubber teeth evenly distributed along the circumference.

[0008] Preferably, the axial top surface of the soft rubber sleeve and the bottom surface of the hard rubber sleeve are fixedly assembled by a high-temperature resistant elastic adhesive, and the bottom surface of the inner hole of the hard rubber sleeve is flush with the inner end surface of the annular magnetic strip.

[0009] Preferably, the axial top end of the threaded nail is machined with a standard octagonal groove along the axial direction, and the octagonal groove forms a radially fitting engagement connection with the cylindrical outer wall of the working end.

[0010] Preferably, each sidewall of the working end is provided with micro-protruding teeth at the center position, which engage with the internal octagonal groove.

[0011] Compared with the prior art, the present invention has the following advantages: 1. On each of the eight sidewalls of the octagonal screwdriver bit, a triangular micro-protrusion tooth structure is symmetrically distributed along the radial cross-section center. The height of the micro-protrusion tooth is controlled within the range of 0.1-0.3mm, the cross-section is an isosceles triangle, the tip points to the radially outward side of the screwdriver bit, and the whole remains parallel to the screwdriver bit axis. At the same time, the upper and lower edges of each sidewall are precision ground to form a uniform 0.5mm arc chamfer. Through the above design, a dual interlocking system of "main octagonal sidewall + auxiliary micro-protrusion tooth" is constructed on the sidewall of the screwdriver bit: the triangular micro-protrusion tooth, with its tiny protrusion structure, can accurately embed into the micro-gap of the inner wall of the octagonal slot of the screw, significantly increasing the normal pressure and friction of the contact interface, effectively avoiding the risk of lateral slippage under high torque conditions; while the arc chamfer of the upper and lower edges of the sidewall optimizes the geometry of the contact transition area, reduces mechanical interference and jamming when the screwdriver bit is inserted into the screw slot, and enhances the adaptability to different machining precisions, improving the meshing compatibility between the screwdriver bit and the screw slot.

[0012] 2. The auxiliary mechanism uses a combination of soft and hard rubber sleeves to enclose the output shaft interface of power tools or quick-connect couplings of pneumatic tools. The soft rubber sleeve is made of elastomeric material and fills the gap between the output interface and the auxiliary mechanism through radial compression deformation, achieving dustproof sealing, vibration buffering, and minor tolerance compensation. The rigid engineering plastic molding provides structural support and limits excessive deformation of the soft rubber sleeve, ensuring the stability of the enclosure.

[0013] 3. The inner wall of the auxiliary mechanism is embedded with a ring-shaped magnetic strip. The magnetic field generates a radial attraction force on the ferromagnetic substrate of the output interface, such as the stainless steel material of the tool body, to achieve axial pre-tight positioning of the bit and the output interface, prevent accidental detachment under high load conditions, and improve the coaxiality of the connection. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the transition link structure in this utility model.

[0016] Figure 3 This is a schematic diagram of the working end and the threaded nail connection structure in this utility model.

[0017] Figure 4 This is a schematic diagram of the auxiliary mechanism in this utility model.

[0018] Figure 5 This is a bottom view of the soft rubber sleeve structure in this utility model.

[0019] in: 1. Transition link; 2. Tool connection part; 3. Working end; 4. Soft rubber sleeve; 5. Rubber pad; 6. Auxiliary mechanism; 7. Threaded nail; 8. Hard rubber sleeve; 9. Micro-convex tooth; 10. Octagonal groove; 11. Annular magnetic strip; 12. Rubber tooth; 13. Through hole. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 5 As shown, an octagonal screwdriver bit includes a transition link 1, a working end 3, micro-protruding teeth 9, and an annular magnetic strip 11. A tool connection part 2 is provided directly above the transition link 1, and the working end 3 is provided directly below the transition link 1. An auxiliary mechanism 6 is provided on the outside of the transition link 1. The auxiliary mechanism 6 wraps the electric or pneumatic output interface with a soft rubber sleeve 4 and a hard rubber sleeve 8, and uses the annular magnetic strip 11 to magnetically position the output interface. A threaded pin 7 is provided directly below the working end 3, and micro-protruding teeth 9 are provided at the center of each side wall of the working end 3.

[0022] In this embodiment, the auxiliary mechanism 6 includes a soft rubber sleeve 4, a rubber pad 5, a hard rubber sleeve 8, an annular magnetic strip 11, rubber teeth 12, and a through hole 13. The axial top end of the soft rubber sleeve 4 is fixedly attached to the bottom end face of the hard rubber sleeve 8, and the bottom end face of the soft rubber sleeve 4 is completely attached to the upper end face of the rubber pad 5. The through hole 13 is opened through the central axis of the rubber pad 5 and the soft rubber sleeve 4. A plurality of annular rubber teeth 12 are evenly distributed along the circumferential direction on the outer peripheral sidewall of the rubber pad 5. The annular magnetic strip 11 is fixed to the inner wall of the hard rubber sleeve 8 by a high-temperature resistant adhesive. The rubber pad 5 forms an interference fit mechanical engagement contact with the cylindrical outer wall of the transition connecting rod 1 by a plurality of annular rubber teeth 12 evenly distributed along the circumferential direction. The axial top end face of the soft rubber sleeve 4 and the bottom end face of the hard rubber sleeve 8 are fixedly assembled by a high-temperature resistant elastic adhesive, and the bottom surface of the inner hole of the hard rubber sleeve 8 is flush with the inner end face of the annular magnetic strip 11.

[0023] Among them: the soft rubber sleeve 4 serves as an elastic outer layer, which fills the gap between the tool interface and the auxiliary mechanism 6 through radial compression deformation, providing dustproof sealing, vibration buffering, and compensating for the manufacturing tolerance of the tool interface, ensuring compatibility of tools of different brands / specifications; the hard rubber sleeve 8 serves as a rigid inner layer, supporting the soft rubber sleeve 4 to prevent excessive deformation and maintain the stability of the wrapping structure.

[0024] In this embodiment, the axial top end of the threaded nail 7 is machined with a standard octagonal groove 10 along the axial direction, and the octagonal groove 10 forms a radially fitting engagement connection with the cylindrical outer side wall of the working end 3; each side wall of the working end 3 is provided with a micro-protruding tooth 9 at the center position, which engages with the inner part of the octagonal groove 10.

[0025] Specifically, the octagonal groove 10 at the top of the threaded nail 7 radially engages with the cylindrical outer wall of the working end 3, firmly connecting the working end 3 to the transition link 1 of the auxiliary mechanism 6, ensuring that the torque is connected from the tool interface to the transition link 1 through the auxiliary mechanism 6, and drives the threaded nail 7 to rotate through the working end 3, thus avoiding power interruption.

[0026] In practical applications, this type of octagonal screwdriver bit includes the following tasks: The soft rubber sleeve 4 serves as an elastic outer layer, filling the gap between the tool interface and the auxiliary mechanism 6 through radial compression deformation, and compensating for the manufacturing tolerance of the tool interface; the hard rubber sleeve 8 serves as a rigid inner layer, supporting the soft rubber sleeve 4 to prevent excessive deformation. The through hole 13 is directly fitted onto the outer side of the cylindrical outer wall of the transition link 1. The outer wall of the transition link 1 and the inner wall of the through hole 13 are not directly fixed. The rubber pad 5 is integrally formed with the soft rubber sleeve 4, and its outer annular rubber teeth 12 form an interference fit mechanical engagement with the cylindrical outer wall of the transition link 1. The elastic deformation of the rubber teeth 12 generates axial frictional resistance, preventing the auxiliary mechanism 6 from axially falling off under high vibration conditions. The inner wall of the hard rubber sleeve 8 is fixed with a ring magnetic strip 11 neodymium iron boron strong magnet by a high temperature resistant adhesive. The magnetic field generates a radial attraction force on the ferromagnetic substrate of the tool interface, realizing the rapid alignment of the bit and the output interface, and providing axial preload through magnetic force. The working end 3 has a regular octagonal cross section, and its sidewalls directly fit into the corresponding groove wall of the screw octagonal groove. The basic torque is transmitted through surface contact to ensure that the bit and the geometric center of the screw are aligned. The triangular micro-protrusion teeth 9 at the center of each sidewall of the working end 3 elastically embed into the micro gaps in the inner wall of the screw octagonal groove when the screw is turned under high torque. The radial pressure of the micro-protrusion teeth 9 prevents the bit from being axially dislodged from the screw groove under high torque. The octagonal groove 10 is located on the part where the axial top of the threaded nail 7 or screw meets the working end 3. Its inner wall is evenly distributed with several positioning steps that match the micro-protruding teeth 9. During operation, the micro-protruding teeth 9 are radially embedded below the positioning steps of the octagonal groove 10 through elastic deformation, forming a double-locking structure in which the tooth end abuts the bottom surface of the step and the tooth side is in an interference fit with the side surface of the step. The radial pressure of the micro-protruding teeth 9 achieves axial positioning of the working end 3 and the octagonal groove 10, and the micro-friction force between the tooth side and the side surface of the step constrains the relative rotation in the circumference. Finally, a cooperative connection mechanism of interlocking and locking is formed to ensure the stability and reliability of torque transmission.

[0027] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. An octagonal screwdriver bit, characterized in that: The device includes a transition link (1), a working end (3), micro-protrusion teeth (9), and an annular magnetic strip (11). A tool connection part (2) is provided directly above the transition link (1), and a working end (3) is provided directly below the transition link (1). An auxiliary mechanism (6) is provided on the outside of the transition link (1). The auxiliary mechanism (6) wraps the electric or pneumatic output interface with a soft rubber sleeve (4) and a hard rubber sleeve (8), and uses the annular magnetic strip (11) to magnetically position the output interface. A threaded pin (7) is provided directly below the working end (3), and micro-protrusion teeth (9) are provided at the center of each side wall of the working end (3).

2. An octagonal screwdriver bit according to claim 1, characterized in that: The auxiliary mechanism (6) includes a soft rubber sleeve (4), a rubber pad (5), a hard rubber sleeve (8), an annular magnetic strip (11), rubber teeth (12), and a through hole (13). The top axial end of the soft rubber sleeve (4) is fixed to the bottom end of the hard rubber sleeve (8). The bottom end of the soft rubber sleeve (4) is completely attached to the top end of the rubber pad (5). The through hole (13) is opened through the central axis of the rubber pad (5) and the soft rubber sleeve (4). Several annular rubber teeth (12) are evenly distributed along the circumferential direction on the outer peripheral sidewall of the rubber pad (5). The annular magnetic strip (11) is fixed to the inner wall of the hard rubber sleeve (8) by a high-temperature resistant adhesive.

3. An octagonal screwdriver bit according to claim 2, characterized in that: The rubber pad (5) forms an interference fit mechanical engagement contact with the cylindrical outer wall of the transition link (1) by a number of annular rubber teeth (12) evenly distributed along the circumference.

4. An octagonal screwdriver bit according to claim 2, characterized in that: The top axial surface of the soft rubber sleeve (4) and the bottom surface of the hard rubber sleeve (8) are fixedly assembled by a high-temperature resistant elastic adhesive, and the bottom surface of the inner hole of the hard rubber sleeve (8) is flush with the inner end surface of the annular magnetic strip (11).

5. An octagonal screwdriver bit according to claim 1, characterized in that: The threaded nail (7) has a standard octagonal groove (10) machined at its axial top end along the axial direction. The octagonal groove (10) forms a radially fitting engagement with the cylindrical outer wall of the working end (3).

6. An octagonal screwdriver bit according to claim 5, characterized in that: The working end (3) has micro-protruding teeth (9) at the center of each side wall, which are engaged with the internal engagement of the octagonal groove (10).

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