Overload protected impact driver

Abstract

A torque transfer assembly for a drill bit holder includes a first lateral member, a second lateral member, and a coupling pin. The first and second lateral members extend substantially parallel to each other along opposite sides of an axial channel of a base of a drive body of the drill bit holder. The drive body includes a drive end configured to engage with a power driver. The coupling pin engages between the drive body and a driven body of the drill bit holder to transfer torque between the drive body and the driven body through engagement of the coupling pin with the first and second lateral members.

Description

Technical Field

[0001] Exemplary embodiments generally relate to drive devices, such as socket tools, drill bit holders, and other fastener drive components. Specifically, exemplary embodiments relate to impact actuators and provide a form of overload protection for impact actuators. Background Technology

[0002] Drive mechanisms, such as sleeve tools and drill bit holders, are common tools used for tightening nuts and driving other drivable components or fasteners. For example, a drill bit holder typically has a drive end that includes a conventional interface for receiving drive energy from a power drive. The drive end may have a standard-sized hexagonal head or other conventional power drill bit drive end geometry. The drill bit holder may also include a driven end driven by a rotational force applied at the drive end by the power drive, which in turn applies drive energy to the drill bit. The drill bit may be housed in a hexagonal sleeve or any other drill bit holding geometry that defines a socket for the drill bit.

[0003] Drill bits of various sizes and shapes can have standard (e.g., hexagonal) heads that allow any of the different drill bits to be interchangeably inserted into the drill bit holder. Therefore, by connecting the drill bit holder to a power drive (e.g., via a power drive chuck), any number of different drill bits can be quickly and easily replaced to meet every situation encountered. Because high torque is often applied through these tools, and high strength and durability are required, drill bit holders are traditionally made of metallic materials such as iron or steel.

[0004] Impact drives are typically used to apply high and sudden torque to fasteners. The high and sudden torque application that can be generated by these devices can be particularly useful for loosening frozen or over-twisted fasteners. However, the application of high and sudden torque is also useful for applying high torque to fasteners used in situations requiring high input torque. In either case, if a drill bit retainer is used with an impact drive, and the retainer is rigidly made of a metallic material, the suddenness of the force applied by the power drive is also abruptly applied to the drill bit through the retainer, which can damage the drill bit, the fastener, or even the retainer itself. Therefore, it may be desirable to improve the design of the drill bit retainer to extend the service life of both the drive and the retainer. Summary of the Invention

[0005] Some exemplary embodiments enable the provision of a drill bit driver including a driven end and a driven end operably coupled to each other via a torque transmission mechanism that, while still applying the full impact energy, ensures that the load through the drill bit holder (and the drill bit) is not completely absorbed or dissipated. Therefore, the lifespan of a high-hardness driven drill bit can be significantly extended.

[0006] In an exemplary embodiment, a resilient torque transmission assembly for a drill bit holder is provided. The resilient torque transmission assembly for the drill bit holder includes a first lateral member, a second lateral member, and a connecting pin. The first and second lateral members extend substantially parallel to each other along opposite sides of an axial passage at the base of a drive body of the drill bit holder. The drive body includes a drive end configured to engage with a power drive. The connecting pin engages between the drive body and a driven body of the drill bit holder to transmit torque between the drive body and the driven body via engagement between the connecting pin and the first and second lateral members.

[0007] In another exemplary embodiment, an impact drill bit holder may be provided. The impact drill bit holder may include: a drive body having a drive end configured to engage with a power drive, and a driven body having a driven end configured to engage with a drill bit. The drive body includes a base. The base of the drive body engages with a coupling pin, which engages between the drive body and the driven body as a resilient torque transmission assembly configured to transmit torque between the drive body and the driven body via the coupling pin. Attached Figure Description

[0008] Some exemplary embodiments have been described in general terms. Reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and in which:

[0009] Figure 1A A perspective view of a drill bit holder according to an exemplary embodiment is shown;

[0010] Figure 1B This is a top view of the manual tool in FIG1 according to an exemplary embodiment;

[0011] Figure 1C According to an exemplary embodiment, along Figure 1B A cross-sectional view of the drill bit holder taken by line A-A';

[0012] Figure 1D This is according to an exemplary embodiment. Figure 1A Exploded view of the drill bit retainer;

[0013] Figure 2A A top view of a drill bit holder according to another exemplary embodiment is shown;

[0014] Figure 2B An example of an embodiment of the process is shown. Figure 2A A cross-sectional view taken by line B-B' in the diagram;

[0015] Figure 2C It is according to the exemplary embodiment that the passage is substantially perpendicular to the defined Figure 2B A cross-sectional view taken from a plane;

[0016] Figure 2D This is according to an exemplary embodiment. Figure 2A An exploded perspective view of the drill bit retainer;

[0017] Figure 3A This is a perspective view of a single continuous retaining ring according to an exemplary embodiment;

[0018] Figure 3B This is a perspective view of a separate cotter pin retaining ring according to an exemplary embodiment;

[0019] Figure 4A This is a cross-sectional view of an alternative torque transmission assembly according to an exemplary embodiment;

[0020] Figure 4B This is a cross-sectional view of another alternative torque transmission component according to an exemplary embodiment;

[0021] Figure 5 This is a perspective view of a torque transmission assembly that physically separates the driving body and the driven body in the axial direction according to an exemplary embodiment;

[0022] Figure 6A This is a perspective view of a drill bit holder having an alternative structure according to an exemplary embodiment;

[0023] Figure 6B According to an exemplary embodiment, along Figure 6A A cross-sectional view taken along the longitudinal centerline or axis of the drill bit retainer; and

[0024] Figure 6C An exemplary embodiment is shown. Figure 6A Exploded view of the drill bit retainer. Detailed Implementation

[0025] Some exemplary embodiments will now be described more fully below with reference to the accompanying drawings, which illustrate some, but not all, of the exemplary embodiments. In fact, the examples described and depicted herein should not be construed as limiting the scope, applicability, or configuration of this disclosure. Rather, these exemplary embodiments are provided to enable this disclosure to meet applicable legal requirements. The same reference numerals throughout denote the same elements. Furthermore, as used herein, the term “or” should be interpreted as a logical operator that results in a true value whenever one or more of its operands are true. As used herein, an operable connection should be understood to refer to a direct or indirect connection, in either case, that enables functional interconnection of components operably connected to each other.

[0026] As described above, some exemplary embodiments may relate to providing a drive tool, such as a drill bit retainer for use with an impact drive. In an exemplary embodiment, the drive tool (which will be described as a drill bit retainer to illustrate an example) may be configured to prevent the drill bit retainer from absorbing and dissipating all torque loads applied to it within the metal shaft or core of such a device. Instead, a structure is employed that strategically distributes forces within the device without reducing the total impact energy that can be transmitted through the device. For example, the drill bit retainer described herein may include a drive end and a driven end, which are manufactured separately and do not directly connect torque between them. Instead, the drive end and the driven end are operatively connected to each other via a resilient torque transmission component. Some structures that may be employed in exemplary embodiments will now be described below by way of example and not limitation.

[0027] Figure 1A A perspective view of a drill bit holder 100 according to an exemplary embodiment is shown. Figure 1B yes Figure 1A A top view of the drill bit holder 100. Figure 1C It shows along Figure 1B The sectional view taken by line A-A' in the middle. Figure 1D This is an exploded perspective view of the drill bit holder 100. The drill bit holder 100 may be defined by a driven end 102 and a driven end 104, which are each separate components operatively connected together via an elastic torque transmission assembly 190 of an exemplary embodiment.

[0028] As described above, the drive end 104 is configured to connect to a power drive device, and the driven end 102 is configured to engage with a drill bit. The drive end 104 may include a drive body 110. The drive body 110 may include a hexagonal head 112 and a shaft 114 coaxial with each other, and a base 116, or defined therewith. The base 116 may be a substantially cylindrical body including an axial channel 120 and a lateral channel 122, each of which extends from the distal end of the drive body 110 (relative to the hexagonal head 112) toward the shaft 114. The axial channel 120 may be drilled (or formed) into a cylindrical channel aligned with the axis of the drill bit holder 100. Meanwhile, the lateral channel 122 may divide the base 116 into lateral members 124 and 126 facing each other around the lateral channel 122. Therefore, the lateral members 124 and 126 can be represented as corresponding fork heads or teeth of a tuning fork, and the base 116 can resemble the corresponding fork heads or teeth of a tuning fork after the axial channel 120 and the lateral channel 122 are formed or cut therein. The shape of the lateral channel 122 can be constant or vary along its length. In the illustrated example, the lateral channel 122 may have an expanded width at its portion spaced apart from the distal end. Furthermore, the expanded width of the lateral channel 122 in this portion can actually make the axial channel 120 discontinuous, existing only at the distal and proximal ends of the base 116. However, other configurations are also possible.

[0029] In this example, the distal end of the base 116 may include shoulders extending toward each other on opposite sides of the lateral channel 122 and the axial channel 120. In this respect, a first shoulder 128 may be formed on a lateral member 124, and a second shoulder 129 may be formed on another lateral member 126.

[0030] Driven end 102 may include a driven body 130. Driven end 102 may be configured to engage with a drill bit to drive the drill bit in response to a torque applied to drive end 104 by a power drive. Driven body 130 may include a hexagonal sleeve 132 and sleeve body 134 coaxial with each other, and a connecting rod 136. Base rod 136 may be a cylinder shaped to fit into the axial channel 120 of drive body 110. Thus, base rod 136 may have a length approximately equal to the axial channel 120, and an outer diameter approximately equal to the inner diameter of the axial channel 120 (at least at shoulders 128 and 129). Base rod 136 may therefore extend between lateral members 124 and 126, and lateral members 124 and 126 may contact the outer peripheral edge of base rod 136 at least at their distal ends and in some cases along their entire length.

[0031] The base rod 136 may also include a radial channel 138 formed in the portion of the base rod 136 near the sleeve body 134. The connecting pin 140 may be configured to fit into the radial channel 138 and may have a longitudinal length substantially equal to the outer diameter of the base 116 of the drive body 110 and / or the outer diameter of the sleeve body 134 of the follower body 130. Shoulders 128 and 129 may each have a groove 142 formed therein, configured to engage the outer peripheral edge of the connecting pin 140. Thus, in this example, the connecting pin 140 extends in a lateral direction substantially perpendicular to the longitudinal axis (or axial direction) of the drill bit holder 100.

[0032] In this exemplary embodiment, the connecting pin 140 arranged in the radial channel 138 of the base rod 136 and the shoulders 128 and 129 of the lateral members 124 and 126 can form a resilient torque transmission assembly 190. Thus, the base 116 of the drive body 110 (of which the lateral members 124 and 126 are part) can be said to resiliently engage the connecting pin 140 to form the resilient torque transmission assembly. The assembly of these components can be relatively simple, but provides a flexible connection that protects the drill bit retainer 100. In this regard, for example, the base rod 136 can be inserted into the axial channel 120 until the distal ends of the lateral members 124 and 126 abut or approach the sleeve body 134. The sleeve body 134 can then be rotated within the axial channel 120 until the radial channel 138 is substantially aligned with the grooves 142 formed in the shoulders 128 and 129 of the drive body 110. The coupling pin 140 can then be inserted through the radial channel 138 to also contact the shoulders 128 and 129 (e.g., at their recesses 142). In some cases, the coupling pin 140 can be press-fitted into its position. Inserting the coupling pin 140 into the radial channel 138 completes the formation of the resilient torque transmission assembly 190 of this example. However, it should be understood that other structures can also be employed to perform the same desired function, namely, to provide some elasticity in the connection between the drive body 110 and the driven body 130.

[0033] When the elastic torque transmission assembly 190 is formed, the torque applied at the drive end 102 (e.g., a large instantaneous torque from an impact actuator) will correspondingly apply torque to the base 116 (e.g., via the hexagonal head 112 and shaft 114). Therefore, the lateral members 124 and 126 will be carried together with the base 116 to rotate the shoulders 128 and 129, which contact the connecting pin 140 and apply rotational force thereto. Rotation of the connecting pin 140 can correspondingly drive the driven body 130 to rotate via the connecting pin 140 engaging with the base rod 136, thereby also applying rotational force to rotate the sleeve body 134 and the hexagonal sleeve 132.

[0034] If we assume that the hexagonal sleeve 132 is in contact with the fastener or the drill bit that engages with the fastener, it can be understood that the driven body 130 transmits rotational torque to the fastener or the drill bit. If the fastener is in an environment that makes the fastener resist rotation, a normal drill bit holder would have to dissipate all the impact torque in the metal structure of the drill bit holder, and the drill bit holder might fail. However, the resilient torque transmission assembly 190 of this exemplary embodiment will allow the maximum torque to still be transmitted to the fastener, but will provide sufficient flexural capacity for the drill bit holder 100 to significantly reduce the likelihood of component failure. In this respect, for example, the lateral members 124 and 126 are able to flex slightly away from each other while still transmitting rotational torque to the coupling pin 140. The flexural capacity of the lateral members 124 and 126 allows torque to be transmitted to the driven body 130, while smaller peak instantaneous stresses are applied to the components of the drill bit holder 100.

[0035] It is worth noting that, Figure 1B The dimensions of the drill bit retainer 100 are shown, including its length (e.g., 3.38 inches) and diameter (e.g., 0.5 inches). However, these measurements should be understood as merely illustrative, and other designs may employ different dimensions. Furthermore, in some cases, the dimensions may simply be scaled up or down to accommodate different hexagonal sleeve 132 sizes.

[0036] In some cases, it may be desirable to limit the permissible deflection of the lateral members 124 and 126. The choice of material (typically steel) and the thickness of the lateral members 124 and 126 can play a significant role in determining the permissible deflection. However, in some cases, other motion limiters may be employed. Figure 2A , 2B Figures 2C and 2D illustrate another exemplary embodiment, which includes examples of some motion restriction options.

[0037] In this regard, for example, Figure 2A A top view of a drill bit holder 100' according to an exemplary embodiment is shown. Figure 2B It shows along Figure 2A The cross-sectional view taken by line B-B' in the figure. Figure 2C Through and limited Figure 2B The cross-sectional view is a cross-sectional view taken from a plane that is substantially perpendicular to the plane. Figure 2D This is an exploded perspective view of the drill bit retainer 100'. Figures 2A-2D In the middle, the drill bit retainer 100' may have the same features as the one referenced above. Figure 1A-1D The drill bit holder 100 has the same structure as described above. However, Figures 2A-2D The drill bit retainer 100' may also include additional structures or components as described herein.

[0038] In an exemplary embodiment, retaining ring 200 and / or bushing 210 may be added. Figure 1A-1D The drill bit retainer 100 provides Figures 2A-2D The drill bit retainer 100'. A retaining ring 200 (if used) may be arranged to extend around the distal ends of the lateral members 124 and 126. The retaining ring 200 may have an inner diameter that is slightly larger than the outer diameter of the lateral members 124 and 126 under no-load conditions (i.e., when no torque is applied to the drive end 102). When torque is applied to the drive end 102, the lateral members 124 and 126 may be allowed to bend, at least until they begin to contact the retaining ring 200. Thus, the retaining ring 200 may provide external restraint, or at least additional structure, to prevent the movement (i.e., deflection) of the lateral members 124 and 126 from exceeding a threshold amount of movement (e.g., defined by the gap between the retaining ring 200 and the lateral members 124 and 126 or by the amount of clearance allowed by the retaining ring 200 due to its structure). Therefore, in some embodiments, the retaining ring 200 can limit the elastic limit of the resilient torque transmission assembly 190 by defining the maximum amount of lateral or axial movement of the lateral members 124 and 126 away from the longitudinal axis of the drill bit retainer 100'.

[0039] The bushing 210 (or housing) can be made of composite materials, resin, etc. Therefore, even when the retaining ring 200 is not in use, the bushing 210 can provide some resistance to prevent the lateral members 124 and 126 from unfolding. However, if the retaining ring 200 is in use, the bushing 210 can also limit the expansion of the retaining ring 200 (e.g., if the retaining ring 200 is configured to flex itself, for example when the retaining ring 200 is not as...). Figure 3A The ring or continuous ring 300 shown is not as shown. Figure 3B (The case of the cotter pin 310 shown). Therefore, the retaining ring 200 and the bushing 210 may each be components of the resilient torque transmission assembly 190 in some exemplary embodiments. In some embodiments, the retaining ring 200 provides resistance to the unfolding of the lateral members 124 and 126, while the bushing 210 does not provide resistance to the unfolding of the lateral members 124 and 126, but is instead configured to rotate freely relative to the follower 130. In any case, the bushing 210 may be arranged to electrically insulate the drill retainer 100' and / or prevent wear on the drill retainer 100' or other components that the drill retainer 100' may come into contact with during use.

[0040] As from Figure 1A-2DAs can be understood, drill bit holders 100 and 100' can be configured to allow the drive member 110 and driven member 130 to effectively transmit torque between them, but in a way that reduces the maximum instantaneous torque experienced in the drill bit holders 100 or 100'. In this regard, the resilient torque transmission assembly 190 flexibly connects the drive member 110 to the driven member 130, providing a small amount of clearance between them under significant loads. By including a small amount of clearance, and by the elasticity provided by the resilient torque transmission assembly 190, although the same torque is ultimately transmitted from the drive member 110 to the driven member 130, the force is distributed in a less concentrated manner through the structure of the drill bit holders 100 / 100', thereby improving durability and reducing the chance of component failure of the drill bit holders 100 / 100' over time.

[0041] In one exemplary embodiment, the drive body 110, the driven body 130, and other internal components may be made of the same type of metallic material (e.g., steel or various alloys thereof). Meanwhile, the bushing 210 may be made of a scratch-resistant or decorative material (e.g., plastic, nylon, or other moldable materials). However, in some embodiments, the bushing 210 may also be designed to bear a load.

[0042] It should also be understood that torque transmission components can take different forms. For example, such as Figure 4A and 4B As shown, the torque transmission assembly can be provided in the form of a high-energy elastomer with a unique shape, which serves to provide engagement between the driving and driven bodies. In this respect, Figure 4A A drill bit holder 400 is shown, configured to operatively connect a drive body 410 to a driven body 420 via an elastomeric member 430. The elastomeric member 430 may have grooves, ridges, or other structures configured to engage with each of the drive body 410 and the driven body 420 to retain the elastomeric member 430 between the drive body 410 and the driven body 420 to transmit torque between them. However, the elastomeric member 430 may include a deformation cavity 432 disposed therein to allow the elastomeric member 430 to undergo some minor deformation in response to a high and sudden torque input. In this respect, the deformation cavity 432 can flex a certain amount in the radial direction in response to an applied high and sudden torque as it changes shape to accommodate the deformation. The shape of the deformation cavity 432 (i.e., teardrop shape) contributes to its flexural capacity.

[0043] exist Figure 4B The example used a slightly different approach. Figure 4BIn this example, the drill bit retainer 450 is also configured to operatively connect the drive body 460 to the driven body 470 via an elastomeric member 480. However, in this example, the outer periphery of the driven body 470 is provided with a shaped ridge 472 that substantially matches the shape of a corresponding valley 462 formed in the drive body 460. Meanwhile, the elastomeric member 480 is formed in the gap between the drive body 460 and the driven body 470 to transmit torque therebetween. The elastomeric member 480 may include a deformation cavity 482 disposed therein to allow the elastomeric member 480 to undergo some minor deformation in response to a high and sudden torque input. In this respect, the deformation cavity 482 may be arranged between each adjacent surface of the ridge 472 and the valley 462 and slightly compressed in response to the applied high and sudden torque, allowing the elastomeric member 480 to flex to a certain extent in the radial direction.

[0044] exist Figure 4A and 4B In the example, the elastomeric members 430 / 480 are arranged between the overlapping (axial) portions of the drive body 410 / 460 and the driven body 420 / 470. However, the torque transmission assembly can also, or alternatively, be arranged between non-overlapping drive and driven bodies. In this respect, for example, Figure 5 A drill bit holder 500 is shown, configured to operatively connect a drive body 510 to a driven body 520 via a thermoplastic connector 530. The thermoplastic connector 530 may have grooves, ridges, or other structures configured to engage with each of the drive body 510 and the driven body 520 to retain the thermoplastic connector 530 between the drive body 510 and the driven body 520, thereby transmitting torque therebetween. However, as... Figure 5 As shown, the driven body 520 and the driving body 510 may not overlap axially. In other words, the thermoplastic coupling 530 may be arranged in a gap region that physically separates the driving body 510 and the driven body 520 axially from each other. The thermoplastic coupling 530 may be made of polyamide-imide, for example... Or note similar materials with superior mechanical, thermal, and chemical resistance. As in the examples above, bushings or housings may also be included. Figure 5 The drill bit retainer 500 shown above.

[0045] Other strategies can also be used. For example, Figure 6A This is a perspective view of a drill bit holder 600 having an alternative structure according to an exemplary embodiment. Figure 6B It is a cross-sectional view taken along the longitudinal centerline or axis of the drill bit retainer 600. Figure 6CThis is an exploded view of the drill bit holder 600. The drill bit holder 600 includes a drive body 610 and a driven body 620, which are again separated from each other in the axial direction. Specifically, the drive body 610 and the driven body 620 are axially separated from each other by a resilient torque transmission assembly 630. The resilient torque transmission assembly 630 includes a plate member 632 having a rectangular plate shape, which extends between a first groove 612 formed in the drive body 610 and a second groove 622 formed in the driven body 620. In some cases, a housing or bushing 640 may be provided on the plate member 632, and the bushing 640 may be molded to also fill around the side edges of the plate member 632 to form a cylindrical body surrounding the drill bit holder 600. Figure 6A , 6B As can be understood in 6C, when a sudden and / or high torque is applied to the drive body 610, the plate member 632 may slightly deflect while transmitting the torque to the driven body 620. The deflection of the plate member 632 may enable the full transmission of the torque, but, as in the example above, slows down its application.

[0046] Some exemplary embodiments of the torque transmission assembly may include a dual function: maintaining the drive body 110 and the driven body 130 axially close to each other and transmitting (or connecting) torque from the drive body 110 to the driven body 130. These two functions can be performed by the elastic properties of an elastic torque transmission assembly 190 that connects the drive body 110 and the driven body 130 while maintaining their axial proximity.

[0047] Therefore, a drive device (e.g., an impact drill bit holder) of exemplary embodiments may be provided, or a torque transmission assembly included in such a drive device. An impact drill bit holder may include: a drive body having a drive end configured to engage with a power drive, and a driven body having a driven end configured to engage with a drill bit. The drive body includes a base. The base of the drive body engages with a coupling pin, which engages between the drive body and the driven body as a resilient torque transmission assembly configured to transmit torque between the drive body and the driven body via the coupling pin.

[0048] In some embodiments, the drill bit retainer may include additional optional features, and / or the aforementioned features may be modified or added. Some examples of modifications, optional features, and extensions are described below. It should be understood that modifications, optional features, and extensions may be added individually, or they may be added cumulatively in any desired combination. In an exemplary embodiment, the base may include an axial channel and lateral members extending along opposite sides of the axial channel, and the lateral members may engage a connecting pin. In some cases, each lateral member may include a shoulder having a groove formed therein, and the groove of each lateral member may engage the outer peripheral edge of the connecting pin. In an exemplary embodiment, the follower may include a base rod extending in an axial direction and configured to be received in the axial channel, and the connecting pin may extend through a radial channel formed in the base rod. In some cases, the length of the connecting pin may be substantially equal to the outer diameter of the sleeve body of the follower and the base. In an exemplary embodiment, the radial channel may extend substantially perpendicular to the axial channel, and the diameter of the connecting pin may be smaller than the diameter of the base rod. In some cases, a retaining ring may be arranged to extend around the connecting pin and the shoulder of each lateral member. In an exemplary embodiment, the bushing may be arranged to extend around the outer periphery of the lateral member and the retaining ring. In some cases, the bushing may be formed of resin or a composite material. In an exemplary embodiment, the retaining ring may be a continuous ring or a cotter pin. In an exemplary embodiment, the retaining ring may define the resilient limit of the resilient torque transmission assembly by defining a maximum amount of axial displacement of the lateral member away from the axial channel.

[0049] Benefiting from the teachings presented in the foregoing description and associated drawings, those skilled in the art will conceive of many modifications and other embodiments of the invention set forth herein. Therefore, it should be understood that the invention is not limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Furthermore, while the foregoing description and associated drawings describe exemplary embodiments in the context of certain exemplary combinations of elements and / or functions, it should be understood that different combinations of elements and / or functions may be provided by alternative embodiments without departing from the scope of the appended claims. In this regard, for example, combinations of elements and / or functions different from those explicitly described above are also contemplated as being set forth in some of the appended claims. Where advantages, benefits, or solutions to problems are described herein, it should be understood that such advantages, benefits, and / or solutions may apply to some exemplary embodiments but not necessarily to all exemplary embodiments. Therefore, any advantages, benefits, or solutions described herein should not be considered critical, essential, or necessary to all embodiments or the embodiments claimed herein. Although specific terms are used herein, they are used only in a general and descriptive sense and not for limiting purposes.

Claims

1. An impact drill bit holder, comprising: A drive body having a drive end configured to engage with a power drive, the drive body including a base; as well as A driven body, having a driven end configured to engage with a drill bit. The base of the drive body engages with a connecting pin, which engages between the drive body and the driven body as an elastic torque transmission assembly, which is configured to transmit torque between the drive body and the driven body via the connecting pin.

2. The impact drill bit holder according to claim 1, wherein the base includes an axial channel and lateral members extending along opposite sides of the axial channel, and The lateral member engages the connecting pin.

3. The impact drill bit holder of claim 2, wherein each of the lateral members includes a shoulder having a groove formed therein, and in, The groove in each of the lateral members engages with the outer peripheral edge of the connecting pin.

4. The impact drill bit holder of claim 3, wherein the driven body comprises a base rod extending in the axial direction and configured to be received in the axial channel, and in, The connecting pin extends through a radial channel formed in the base rod.

5. The impact drill bit holder according to claim 4, wherein the driven body includes a sleeve body, and the length of the connecting pin is substantially equal to the outer diameter of the base of the drive body and the outer diameter of the sleeve body of the driven body.

6. The impact drill bit holder according to claim 4, wherein the radial channel extends substantially perpendicular to the axial channel, and in, The diameter of the connecting pin is smaller than the diameter of the base rod.

7. The impact drill bit retainer of claim 3, wherein the retaining ring is arranged to extend around the shoulder of each of the connecting pin and the lateral member.

8. The impact drill bit retainer of claim 7, wherein the bushing is arranged to extend around the outer periphery of the lateral member and the retaining ring.

9. The impact drill bit retainer according to claim 8, wherein the bushing comprises resin or composite material.

10. The impact drill bit retainer according to claim 7, wherein the retaining ring comprises a continuous ring or a cotter pin.

11. The impact drill bit retainer of claim 7, wherein the retaining ring limits the elastic limit of the elastic torque transmission assembly by limiting the maximum amount of axial displacement of the lateral member away from the axial channel.

12. A resilient torque transmission assembly for a drill bit holder, the resilient torque transmission assembly comprising: A first lateral member and a second lateral member extend substantially parallel to each other along opposite sides of an axial channel at the base of the drive body of the drill bit holder, the drive body having a drive end configured to engage with a power drive. as well as A connecting pin engages between the drive body and the driven body of the drill bit holder to transmit torque between the drive body and the driven body via engagement between the connecting pin and the first lateral member and the second lateral member.

13. The resilient torque transmission assembly of claim 12, wherein both the first lateral member and the second lateral member include a shoulder having a groove formed therein, and in, The groove of each of the first lateral member and the second lateral member engages with the outer peripheral edge of the connecting pin.

14. The resilient torque transmission assembly of claim 13, wherein the base rod of the driven member extends in the axial direction and is configured to be received in the axial channel, and in, The connecting pin extends through a radial channel formed in the base rod.

15. The resilient torque transmission assembly of claim 14, wherein the driven body comprises a sleeve body, and the length of the connecting pin is substantially equal to the outer diameter of the base of the drive body and the outer diameter of the sleeve body of the driven body.

16. The resilient torque transmission assembly of claim 14, wherein the radial channel extends substantially perpendicular to the axial channel, and in, The diameter of the connecting pin is smaller than the diameter of the base rod.

17. The resilient torque transmission assembly of claim 13, further comprising a retaining ring arranged to extend around the shoulder of the coupling pin and each of the first lateral member and the second lateral member.

18. The resilient torque transmission assembly of claim 17, further comprising a bushing arranged to extend around the outer periphery of the lateral member and the retaining ring.

19. The resilient torque transmission assembly of claim 18, wherein the bushing comprises resin or a composite material.

20. The resilient torque transmission assembly of claim 17, wherein the retaining ring limits the resilient limit of the resilient torque transmission assembly by limiting the maximum amount of axial displacement of the lateral member away from the axial channel.

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