Fast-drilling locking device
The fastening device addresses the challenge of simultaneous reaming efficiency and chip removal by employing a dual-width cutting edge and chip-guiding structure, enhancing drilling speed and reducing torque peaks in high-density materials.
Patent Information
- Application Number
- TW114211390
- Authority / Receiving Office
- TW · TW
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-07-11
- Estimated Expiration
- 2035-10-28
AI Technical Summary
Existing fastening devices for rapid drilling face challenges in achieving simultaneous high reaming efficiency and effective chip removal, particularly with high-density materials, leading to prolonged penetration times and increased vibration risks due to chip accumulation and recutting.
A fastening device with a body, drive structure, rotary vane, and drilling unit featuring a first and second cutting edge with varying widths and a chip-guiding structure, forming a progressively expanding hole diameter and continuous chip-guiding path to manage chip accumulation and reduce cutting load concentration.
The device enhances drilling efficiency by shortening the work cycle and improving material feed efficiency without pre-drilling, especially in high-density materials, by suppressing cutting load concentration and reducing peak feed torque.
Smart Images
Figure IMG-2_DRAW_114211390-A0305-14-0001-1 
Figure IMG-2_DRAW_114211390-A0305-14-0002-2 
Figure IMG-2_DRAW_04_A0101_DRAWINGS_1
Abstract
Description
Fast-drilling locking device Technical Field
[0001] A locking device, particularly a locking device that allows for rapid drilling. Prior Technology
[0002] Existing fastening devices for rapid drilling, numbering over 100, employ a single-stage truncate drill bit, as shown in Figure 1. Their operating principle involves tip-in insertion, with a single-stage cutting edge 110 performing both reaming and chip removal, and the chips being discharged through the gap of a single rotary blade 130. However, in practice, the single-diameter configuration limits chip capacity, causing chips to accumulate and repeatedly contact the cutting edge, leading to recutting and unstable feed during drilling. This is especially problematic with high-density wood materials, where the penetration time is significantly prolonged, often requiring pre-drilling to avoid poor locking. To alleviate chip removal issues, a common practice is to set a cutoff at the truncate drill bit or thread initiation area to provide a bypass chip removal path. However, this reduces the rigidity of the truncate drill section, increasing the risk of vibration, and even under high chip volume conditions, maintaining continuous chip removal is difficult. In summary, existing technologies involve a structural trade-off between reaming efficiency and chip removal capability, making it difficult to achieve rapid drilling simultaneously without pre-drilling.
[0003] To address the aforementioned issues, JP7145025B2 proposes a stepped geometry self-drilling screw design. This design utilizes obtuse angles that increase towards the tip of each segment, combined with the cutting edge formed by longitudinal grooves. This allows for slow and gradual insertion of the material, stabilizing torque and achieving high-precision hole machining. However, the JP7145025B2 structure lacks an active mechanism to expand the space to accommodate chips, primarily relying on passive chip guidance through the longitudinal grooves. Therefore, in situations with high chip volume or requiring rapid feed, both chip removal and feed efficiency are limited. Summary of the Invention
[0004] The main purpose of this new invention is to improve the insufficient drilling efficiency of conventional single-stage tee clamping devices.
[0005] To achieve the above objectives, this invention provides a fastening device comprising a body, a drive structure, a rotary vane, and a drilling unit. The body includes a drive end and a drilling end located away from the drive end. The drive structure is disposed at the drive end of the body, and the rotary vane is arranged around the outer periphery of the body. The drilling unit is disposed at the drilling end of the body and includes a piercing portion, a first cutting edge surrounding the outer periphery of the body, a second cutting edge surrounding the outer periphery of the body and connected to the first cutting edge, and a receiving structure disposed around the outer periphery of the body and corresponding to the first and second cutting edges. The first cutting edge includes a first peak and a valley connecting to the body, and the second cutting edge includes a second peak and a second valley connecting to the first cutting edge. The maximum width of the first cutting edge is smaller than the maximum width of the second cutting edge. The receiving structure defines a receiving area around the outer periphery of the body.
[0006] In one embodiment, the first cutting edge and the second cutting edge both point in the same direction as the drilling direction of the puncture portion.
[0007] In one embodiment, the drilling and cutting unit further includes a transition section located between the first cutting edge and the second cutting edge, the transition section forming a linear transition at the outer periphery of the body.
[0008] In one embodiment, the drilling and cutting unit further includes a receiving structure disposed on the outer periphery of the body and corresponding to the first cutting edge and the second cutting edge, the receiving structure defining a receiving area on the outer periphery of the body.
[0009] In one embodiment, the receiving structure includes at least one chip-holding space spaced along the outer periphery of the body, the at least one chip-holding space space dividing the first cutting edge and the second cutting edge into at least one spaced-apart flaps respectively.
[0010] Through the foregoing embodiments of this invention, compared with conventional methods, this invention possesses the following characteristics:
[0011] This novel design utilizes the relative widths of the first and second cutting edges, along with a chip-guiding structure connecting the first and second valleys, to form a progressively expanding hole diameter sequence and a continuous chip-guiding path along the drilling direction during the drilling process. This continuous chip-guiding path allows the chips to remain in the transition chip-receiving zone and be refined by the relative action of the first and second cutting edges, thereby suppressing cutting load concentration and reducing peak feed torque. In other words, it can shorten the work cycle and improve material feed efficiency without the need for pre-drilling. Simple Explanation of the Diagram
[0012] Figure 1 is a schematic diagram of a conventional fastening device. Figure 2 is a schematic diagram of the structure of this novel fastening device. Implementation
[0013] The preferred embodiment of this invention is shown in the figures. The purpose of the figures is to supplement the textual description of the specification with graphics, enabling a person to intuitively and vividly understand each technical feature and the overall technical solution of this invention. However, they should not be construed as limiting the scope of protection of this invention. In the description of this invention, the use of terms such as "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated. In the description of this invention, unless otherwise explicitly defined, terms such as "setup" and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the aforementioned terms in this invention in conjunction with the specific content of the technical solution, which is stated above.
[0014] The detailed description and technical content of this new invention are explained below with reference to the accompanying drawings:
[0015] Referring to Figure 2, this invention provides a fastening device 200, comprising a body 210, a drive structure 230, a rotary vane 250, and a drilling unit 270. The body 210 includes a drive end 211 and a drilling end 212 located away from the drive end 211. The drive structure 230 is disposed at the drive end 211 of the body 210, and the rotary vane 250 is arranged around the outer periphery of the body 210. The drilling unit 270 includes a piercing portion 271, a first cutting edge 272 arranged around the outer periphery of the body 210, a second cutting edge 273 arranged around the outer periphery of the body 210 and connected to the first cutting edge 272, and a receiving structure disposed around the outer periphery of the body 210 and correspondingly configured with the first cutting edge 272 and the second cutting edge 273. The first cutting edge 272 includes a first peak 274 and a first valley 275 connected to the body 210, the second cutting edge 273 includes a second peak 276 and a second valley 277 connected to the first cutting edge 272, and the maximum width of the first cutting edge 272 is smaller than the maximum width of the second cutting edge 273.
[0016] Continuing from above, the piercing portion 271 of the drilling unit 270 is located at the drilling end 212 of the body 210, and the piercing portion 271 is used to guide the fastening device 200 into the workpiece. The first cutting edge 272 is circumferentially disposed around the body 210 and connected to the piercing portion 271, and the second cutting edge 273 is circumferentially disposed around the body 210 and connected to the first cutting edge 272. More specifically, the first valley portion 275 is adjacent to the body 210, defining a primary chip-receiving area 278 between the first cutting edge 272 and the body 210. The second valley portion 277 is located between the first cutting edge 272 and the second cutting edge 273, and the first cutting edge 272 and the second cutting edge 273 define a transition chip-receiving area 279 and communicate with the aforementioned primary chip-receiving area 278. That is, the first cutting edge 272 and the second cutting edge 273 form a continuous chip-guiding path along the outer periphery of the body 210 without the need for additional groove elements. Furthermore, the second cutting edge 273 is configured with a larger maximum width relative to the first cutting edge 272, allowing the hole diameter to transition from the first cutting edge 272 to the second cutting edge 273 along the drilling direction during the drilling process, and to expand in a stepped manner. In other words, the first peak 274 performs primary cutting, and the second peak 276 completes secondary reaming in the subsequent feed stroke. The second valley 277 acts as a chip confluence zone, reducing the rate of chip return to the cutting edge, and allowing the chips to be continuously transported and discharged along the path of the transition chip-receiving area 279 into the thread gap of the blade 250. On the other hand, when the drilling and cutting unit 270 completes the aforementioned two stages of reaming, the blade 250 can enter the workpiece under low friction. The aperture formed by the first cutting edge 272 provides a guiding function, and the larger aperture formed by the second cutting edge 273 provides space for temporary chip storage. The cooperation between the first cutting edge 272 and the second cutting edge 273 is implemented to suppress the torque peak of the fastening device 200.
[0017] Continuing from the above, the implementation sequence of this novel invention is as follows: The piercing section 271 first enters the material, the first peak 274 cuts to form a primary aperture, and the chips accumulate in the first valley 275 and are transported along the continuous chip guide path. During continuous feed, the second peak 276 cuts to form a secondary aperture, and the width of the secondary aperture is greater than that of the primary aperture, thereby releasing the radial strain around the machining position in stages, and transporting it to the gap of the rotary blade 250 through the continuous chip guide path of the second valley 277 and the first valley 275. Accordingly, the entire drilling stroke sequentially completes the operations of piercing, primary reaming, secondary reaming, and thread engagement. It is hereby explicitly stated that this novel invention does not limit the angle between the first peak 274 and the second peak 276, but the maximum width relationship between the first peak 274 and the second peak 276 is maintained such that the first cutting edge 272 is less than
[0018] The second cutting edge 273 is used to achieve the aforementioned stepped load and chip guiding effect during drilling.
[0019] Please refer to Table 1. The tapping speed of this novel fastening device 200 and a conventional single-step fastening device 100 were measured under the same hardwood substrate (e.g., Pacific ironwood), fixed load, fixed lubrication, and consistent feed speed. The time required for the drill bit to penetrate the hardwood substrate, the time required for the threaded section to penetrate the hardwood substrate, and the tapping speed measurement time were measured for both the conventional fastening device 100 and the novel fastening device 200. The results show that, at all measurement points, the total penetration time of the novel device is shorter than that of the conventional fastening device 100. Furthermore, the drill bit insertion time and threaded section penetration time of both the conventional fastening device 100 and the novel fastening device 200 are generally shorter. The performance difference can be attributed to the stepped hole-enlarging sequence established by the relative width relationship of the two cutting edges. Combined with the chip-guiding path connected by the first valley 275 and the second valley 277, the cutting load concentration is reduced and the chip removal efficiency is improved. Therefore, faster penetration is achieved under the same boundary conditions. This advantage is particularly obvious under high-density hardwood conditions.
[0020] Table 1: Time (seconds) required for the drill bit to penetrate the wooden board. Time required to drive the threaded section (in seconds) Attack speed measurement time (seconds) This new type First test 0.25 2.63 3.10 Second test 0.38 2.38 2.60 Third test 0.38 2.63 2.90 Fourth test 0.38 2.63 2.40 Fifth test 0.50 2.38 2.60 customary knowledge First test 0.75 6.00 6.80 Second test 0.63 3.75 4.30 Third test 0.63 5.13 5.60 Fourth test 0.50 5.25 5.90 Fifth test 0.50 5.50 6.20
[0021] Continuing the description, the present invention's receiving structure defines a receiving area on the outer periphery of the body 210. In one embodiment, the receiving structure includes at least one chip-receiving space 281 spaced apart along the outer periphery of the body 210. The at least one chip-receiving space 281 divides the first cutting edge 272 and the second cutting edge 273 into at least one spaced-apart lobes. The aforementioned at least one lobe is connected to each other by the at least one chip-receiving space 281, and receives and collects chips during cutting, reducing the occurrence of re-cutting. During drilling, the first peak 274 and the second peak 276 are sheared, and the two-stage hole diameter difference causes the generated chips to be dispersed and maintained at a small scale within the at least one chip-receiving space 281. The chips are displaced along the movement path of the first cutting edge 272 and the second cutting edge 273 and are continuously disturbed and refined, thereby achieving the effect of suppressing cutting load concentration and reducing the peak value of the feed torque. It is worth noting that the chips are introduced into the at least one chip-containing space 281 from the moment they are generated, and the chips do not need to be externally discharged, thereby improving the cleanliness of the work site.
[0022] As described above, this novel design, using the relative widths of the first cutting edge 272 and the second cutting edge 273, and the chip-receiving space 281 connecting the first valley 275 and the second valley 277, forms a gradually expanding hole diameter sequence and a continuous chip-guiding path along the drilling direction during the drilling process. Therefore, the aforementioned continuous chip-guiding path causes the chips to remain in the transition chip-receiving zone 279, and are refined under the relative action of the first cutting edge 272 and the second cutting edge 273, thereby suppressing cutting load concentration and reducing the peak feed torque. That is, it can shorten the working cycle and improve material feeding efficiency without the need for pre-drilling. Data details are based on the contents shown in Table 1.
[0023] Referring again to Figure 2, in one embodiment, the first cutting edge 272 and the second cutting edge 273 both point in the same direction as the drilling direction of the piercing portion 271. That is, the cutting leading edges of the first peak portion 274 and the second peak portion 276 are arranged facing the drilling direction and are sequentially connected along the outer periphery of the body 210 to facilitate stable cutting during material insertion.
[0024] Continuing from the previous embodiment, the drilling and cutting unit 270 further includes a transition section 280 located between the first cutting edge 272 and the second cutting edge 273, the transition section 280 forming a linear transition at the outer periphery of the body 210. One end of the transition section 280 connects to the first cutting edge 272, and the other end connects to the second cutting edge 273. During drilling, the transition section 280 guides the machining material from primary reaming to secondary reaming and suppresses interference at the step difference.
[0025] 100, 200: Fastening devices 110:Cutting edge 210:Ontology 211: Driver End 212: Drilling end 230: Drive Structure 130, 250: Rotary blades 270: Drilling and Cutting Unit 271: Puncture site 272: First cutting edge 273: Second cutting edge 274: First Peak 275: First Valley Division 276: Second Peak 277: Second Valley 278: Primary chip removal zone 279: Transitional chip-bearing zone 280: Transition Section 281: Chip Space
Claims
1. A fastening device, comprising: a body including a drive end and a drilling end remote from the drive end; a drive structure disposed at the drive end of the body; a rotary blade surrounding the outer periphery of the body; and a drilling and cutting unit disposed at the drilling end of the body, the drilling and cutting unit including a puncture portion, a first cutting edge surrounding the outer periphery of the body, a second cutting edge surrounding the outer periphery of the body and connected to the first cutting edge, and a receiving structure disposed on the outer periphery of the body and correspondingly configured to the first cutting edge and the second cutting edge, the first cutting edge including a first peak and a first valley connected to the body, the second cutting edge including a second peak and a second valley connected to the first cutting edge, the maximum width of the first cutting edge being smaller than the maximum width of the second cutting edge, and the receiving structure defining a receiving area on the outer periphery of the body.
2. The fastening device as described in claim 1, wherein, The first cutting edge and the second cutting edge both point in the same direction as the drilling direction of the puncture part.
3. The fastening device as described in claim 1, wherein, The drilling and cutting unit further includes a transition section located between the first cutting edge and the second cutting edge, which forms a linear transition at the outer periphery of the body.
4. The fastening device as described in claim 1, wherein, The receiving structure includes at least one chip-containing space spaced along the outer periphery of the body, the at least one chip-containing space space dividing the first cutting edge and the second cutting edge into at least one spaced-apart lobes respectively.