Impact drive device with radial hoop wedges

Abstract

A torque transmission assembly for a drill bit holder includes an axial motion limiting subassembly and a rotation limiting subassembly. The axial motion limiting subassembly is configured to hold a drive body of the drill bit holder near a driven body. The rotation limiting subassembly is configured such that torque applied to the drive body is transmitted to the driven body. The rotation limiting subassembly includes a first cam body located at a distal end of the drive body and a second cam body located at a distal end of the driven body. The first and second cam bodies are configured to indirectly transmit most of the torque between the drive body and the driven body via the torque transmission assembly by limiting rotation of the first cam body relative to the second cam body.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Provisional Application No. 62 / 991,139, filed March 18, 2020, pursuant to 35 USC §119(e), the entire disclosure of which is expressly incorporated herein by reference. Technical Field

[0003] 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

[0004] 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 in any other drill bit holding geometry that defines a socket for the drill bit.

[0005] 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 chuck. Therefore, by attaching the drill chuck 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 chuck cylinders are traditionally made of metallic materials such as iron or steel.

[0006] 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 chuck is used with an impact drive, and the drill chuck 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 drill chuck, which can damage the drill bit, the fastener, or even the drill chuck itself. Therefore, it may be desirable to improve the drill chuck design to extend the lifespan of both the drive drill bit and the drill chuck. Summary of the Invention

[0007] Some exemplary embodiments enable the provision of a drill bit driver comprising 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.

[0008] In an exemplary embodiment, a torque transmission assembly for a drill bit holder is provided. The torque transmission assembly may include an axial motion limiting subassembly and a rotation limiting subassembly. The axial motion limiting subassembly is configured to hold a drive body of the drill bit holder near a driven body of the drill bit holder. The rotation limiting subassembly is configured such that torque applied to the drive body is transmitted to the driven body. The rotation limiting subassembly includes a first cam body located at a distal end of the drive body and a second cam body located at a distal end of the driven body. The first and second cam bodies are configured to indirectly transmit most of the torque between the drive body and the driven body via the torque transmission assembly by limiting rotation of the first cam body relative to the second cam body.

[0009] 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; a driven body having a driven end configured to engage with a drill bit; and a torque transmission assembly. The drive body may include a first cam body located distal to the drive end, and the driven body may include a second cam body located distal to the driven end. The torque transmission assembly may be arranged close to the first and second cam bodies and may be configured to transmit torque between the drive body and the driven body. The first and second cam bodies and the torque transmission assembly may be configured to indirectly transmit most of the torque between the drive body and the driven body via the torque transmission assembly. Attached Figure Description

[0010] Having already described some exemplary embodiments in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and in which:

[0011] Figure 1A A perspective view of the drive end of a drill bit holder according to an exemplary embodiment is shown;

[0012] Figure 1B This is a perspective view of the drive end of a drill bit holder according to an exemplary embodiment;

[0013] Figure 2 This is a perspective view of a separate drive body according to an exemplary embodiment;

[0014] Figure 3 This is a perspective view of a separate follower according to an exemplary embodiment;

[0015] Figure 4A This is a perspective view of the first radial member according to an exemplary embodiment;

[0016] Figure 4B This is a perspective view of the second radial member according to an exemplary embodiment;

[0017] Figure 4C This is a perspective view of first and second radial members positioned close to each other according to an exemplary embodiment;

[0018] Figure 4D This is a side view of a wedge-shaped channel formed between a first radial member and a second radial member according to an exemplary embodiment;

[0019] Figure 5 This is a perspective view of a cotter pin forming an elastic member according to an exemplary embodiment;

[0020] Figure 6 This is a perspective view of the cotter pin and the retaining clamp that hold the first radial member and the second radial member according to an exemplary embodiment;

[0021] Figure 7A A perspective view of the drive end of a drill bit holder with its housing removed, according to an exemplary embodiment, is shown;

[0022] Figure 7B This is a perspective view of the drive end of a drill bit holder with its housing removed, according to an exemplary embodiment.

[0023] Figure 8A This is a perspective view of the individual driving body and driven body according to an exemplary embodiment;

[0024] Figure 8B This is according to an exemplary embodiment. Figure 8A A perspective view of the driving body and driven body after the first radial component approaches its positioning;

[0025] Figure 8C This is according to an exemplary embodiment. Figure 8B A perspective view of the driving body and driven body after the second radial member and the limiting hoop are attached;

[0026] Figure 9A and Figure 9B Each showed through Figure 4D Different three-dimensional cross-sectional views of the dividing plane;

[0027] Figure 9C According to an exemplary embodiment, along Figure 9A A cross-sectional view of the drill bit holder taken by line A-A'; and

[0028] Figure 10 A cross-sectional view of a drill bit holder with an alternative elastic member according to an exemplary embodiment is shown. Detailed Implementation

[0029] Some exemplary embodiments will now be described more fully below with reference to the accompanying drawings, which illustrate some, but not all, 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.

[0030] As described above, some exemplary embodiments may relate to providing a drive tool, such as a drill bit holder for use with an impact actuator. In an exemplary embodiment, the drive tool (which will be described as a drill bit holder to illustrate an example) may be configured to prevent the drill bit holder 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 holder described herein may include a drive end and a driven end, which are manufactured separately and do not directly couple 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.

[0031] Figure 1AA perspective view of a drill bit holder 100 according to an exemplary embodiment is shown, showing its driven end 102. Figure 1B This is a perspective view of the drill bit holder 100, showing its drive end 104. As described above, the drive end 104 is configured to connect to a power drive device, and the driven end 102 is configured to connect to the drill bit. The drive end 104 may be included in... Figure 2 The drive body 110 is shown separately. The drive body 110 may include a hexagonal head 112 and a shaft 114 coaxial with each other, and a base plate 116. The base plate 116 may be a cylindrical body that defines a transition to the torque transmission portion of the drive body 110.

[0032] The torque transmission portion of the drive body 110 may include an axial retainer 120, which may be close to and coaxial with the substrate 116, the hexagonal head 112, and the shaft 114. In this exemplary embodiment, the axial retainer 120 is also defined by a cylindrical body. However, the cylindrical body includes an annular groove 122 extending around the circumference of the axial retainer 120 and radially inward from the circumference of the axial retainer 120. In this example, the annular groove 122 is positioned near the longitudinal midpoint of the axial retainer 120, such that a substantial amount of material of the axial retainer 120 is disposed on both sides of the annular groove 112. The torque transmission portion of the drive body 110 may also include a wedge 124 or a cam body. The wedge 124 may be configured to engage with the follower 130 of the driven end 102 and the torque transmission assembly of the exemplary embodiment described in more detail below.

[0033] As described above, the driven end 102 may include a driven body 130. The drive end 102 may be configured to connect to the drill bit to drive the drill bit in response to a torque applied to the drive end 104 by a power drive device. Figure 3 The follower 130 is shown separately. In this respect, the follower 130 may include a hexagonal sleeve 132 and a sleeve body 134 coaxial with each other, as well as a base plate 136. The base plate 136 may be a cylindrical body that defines a transition to the torque transmission portion of the follower 130.

[0034] The torque transmission portion of the follower 130 may include an axial retainer 140, which may be close to the substrate 136 and coaxial with the substrate 136, the hexagonal sleeve 132, and the sleeve body 134. In this exemplary embodiment, the axial retainer 140 is also defined by a cylindrical body and may be mirrored with the axial retainer 120 of the drive body 110. Thus, the cylindrical body of the axial retainer 140 includes an annular groove 142 extending around the circumference of the axial retainer 140 and radially inward from the circumference of the axial retainer 140. In this example, the annular groove 142 is located near the longitudinal midpoint of the axial retainer 140, such that a considerable amount of material of the axial retainer 140 is disposed on both sides of the annular groove 142. The torque transmission portion of the follower 130 may also include a wedge 144 or a cam body. The wedge 144 may be configured to engage with the wedge 124 of the drive body 110 of the drive end 104 and the torque transmission assembly of the exemplary embodiment, as described in more detail below.

[0035] The interface between the wedges 124 and 144 of the drive body 110 and the driven body 130 can be defined in various ways. In this example, the interface can be configured to maintain the axial alignment of the drive body 110 and the driven body 130. Thus, the wedge 124 may have a protrusion 128 extending therefrom, which is coaxial with the longitudinal centerline of the drive body 110 from the distal end of the wedge 124 (relative to the substrate 116). The wedge 144 may have a recess 148 formed therein, which is coaxial with the longitudinal centerline of the driven body 130 and located at the distal end of the wedge 144 (relative to the substrate 136). The recess 148 of the wedge 144 can accommodate the protrusion 128 of the wedge 124 to maintain the coaxiality of the drive body 110 and the driven body 130, while still allowing each of the drive body 110 and the driven body 130 to rotate relative to each other.

[0036] Rotation of the drive body 110 can be transmitted to the driven body 130 via a torque transmission assembly. The torque transmission assembly can be formed in various ways and has various different structures. In one exemplary embodiment, the torque transmission assembly may include a dual function: maintaining the drive body 110 and the driven body 130 axially close to each other (e.g., preventing the protrusion 128 from separating from the recess 148) and transmitting (or communicating) torque from the drive body 110 to the driven body 130. To achieve these dual functions, the torque transmission assembly may include, for example, a pair of radial members (e.g., a first radial member 150 and a second radial member 152, which act as torque transmission elements) and an elastic member (or multiple members).

[0037] Depend on Figure 4A , 4B Figure 4, defined by 4C and 4D, shows the individual first radial member 150. Figure 4A (middle), separate second radial member 152 ( Figure 4B (middle) and the first and second radial members 150 and 152, which are positioned close to each other in their normal configuration. Figure 4C and 4D (Middle). The first radial member 150 and the second radial member 152 may be related to Figure 4D The dividing planes 154 shown are mirror images of each other. The dividing planes 154 may pass along the longitudinal centerline of the drive body 110 and the driven body 130, but also separate the first radial member 150 and the second radial member 152 from each other. Therefore, when positioned in their normal configuration, the first radial member 150 and the second radial member 152 can form a generally cylindrical structure that extends around the wedges 124 and 144 of the drive body 110 and the driven body 130.

[0038] like Figure 4D As best shown, a wedge-shaped channel 155 is provided in the gap formed between the first radial member 150 and the second radial member 152. The wedge-shaped channel 155 may be formed to have a size slightly larger than that of the wedges 124 and 144, but may have a shape that substantially matches the shape of the lateral sides of the wedges 124 and 144. The wedge-shaped channel 155 may be formed by a cam surface 156 facing the lateral sides of the wedges 124 and 144 when the wedges 124 and 144 are inserted into the wedge-shaped channel 155. The longitudinal length of the wedge-shaped channel 155 may be substantially equal to the combined length of the wedges 124 and 144, such that they extend together along their entire length. Therefore, the length of the cam surface 156 may also be substantially equal to the combined length of the wedges 124 and 144, such that the cam surface 156 extends together with the combined length of the lateral sides of the wedges 124 and 144.

[0039] like Figure 4A and 4BAs can be seen and understood from the above description, when the first radial member 150 and the second radial member 152 are arranged close to each other to form a wedge-shaped channel 155 and surround the lateral sides of wedges 124 and 144, the cam surface 156 may terminate at the axial retainers 120 and 140 of the drive body 110 and the follower 130, respectively. Furthermore, the first radial member 150 and the second radial member 152 may each include corresponding examples of annular protrusions 158 configured to insert into annular grooves 122 and 142 of the drive body 110 and the follower 130, respectively. By inserting into the annular grooves 122 and 142, the annular protrusions 158 can keep the drive body 110 and the follower 130 axially close to each other (i.e., such that wedges 124 and 144 are in contact with each other at their respective distal ends (relative to substrates 116 and 136, respectively). However, it should be understood that the torque transmission assembly may further include one or more components for holding the first radial member 150 and the second radial member 152 in a suitable orientation and positioning them close to each other, and further enabling the first member 150 and the second member 152 to perform the dual function described above (i.e., holding the drive body 110 and the driven body 130 in their axial arrangement). Figure 5 -8 shows an example of a component that can perform this function.

[0040] On this point, Figure 5 A perspective view of a cotter pin 200 is shown, which can be used as an example of an elastic member that can be used to hold the first and second radial members 150 and 152 in a proper orientation close to each other, and also prevent the first and second radial members 150 and 152 from moving away from each other when subjected to forces applied to any cam surface 156 (e.g., due to rotational forces applied to the drive body 110 and wedge 124). The cotter pin 200 is configured to resist any radially outward force that would tend to cause the cotter pin 200 to... Figure 5 The stationary position shown is moved. Therefore, when the cotter pin 200 extends around the first and second radial members 150 and 152, as... Figure 6 As shown, any displacement (i.e. radially outward) of the first and second radial members 150 and 152 from their rest positions will also be prevented. Thus, the cotter pin 200 acts as an elastic element to elastically resist movement of either the first or second radial members 150 and 152.

[0041] In one exemplary embodiment, one or more restraining clamps 210 may also be provided to prevent movement of either the first or second radial elements 150 and 152. The restraining clamps 210 may be positioned such that... Figure 6The corresponding longitudinal ends of the cotter pin 200 are shown. The retaining clamp 210 may be an annular or ring-shaped member that extends continuously around the outer periphery of the first and second radial members 150 and 152. The retaining clamp 210 can hold the cotter pin 200 in place, but also helps to keep the first radial member 150 and the second radial member 152 close to each other around the wedges 124 and 144.

[0042] Figure 7 is from Figure 7A and 7B The diagram shows a different perspective view of a fully assembled example of the drill bit holder 100 of FIG1, except that the housing 220 of the drill bit holder 100 shown in FIG1 is... Figure 7A and 7B The text has been removed. Figure 8 is... Figure 8A , 8B As defined by 8C, it illustrates the assembly sequence of the various components of the drill bit holder 100 before reaching the assembly state shown in Figure 7. In this respect, Figure 8A A drive body 110 and a driven body 130 are shown engaging with each other (e.g., by inserting protrusion 128 into recess 148 (see FIG. 9)), and the lateral sides of wedges 124 and 144 are aligned with each other. Figure 8B As shown, the first radial member 150 can be positioned near wedges 124 and 144 such that the lateral sides of wedges 124 and 144 are close to the cam surface 156 of the first radial member 150. The annular protrusion 158 of the first radial member 150 is also inserted into the annular grooves 122 and 142 of the axial retainers 120 and 140 of the drive body 110 and the follower 130, respectively. Thereafter, as... Figure 8C As shown, a second radial member 152 can be placed near the first radial member 150 between substrates 116 and 136 to form a wedge-shaped channel 155, with wedges 124 and 144 arranged inside the wedge-shaped channel. A retaining clamp 210 can then be placed around the outer periphery of the first and second radial members 150 and 152. A cotter pin 200 can also be placed around the outer periphery of the first and second radial members 150 and 152, as further shown in FIG. 7. The housing 220 of FIG. 1 can then be applied.

[0043] Figure 9 is from Figure 9A , 9B As defined in 9C, it illustrates how an exemplary embodiment of the drill bit holder 100 can be constructed to further explain the drill bit holder 100 (e.g., see reference 9C). Figure 9A and 9B ) and operations (e.g., refer to Figure 9A , 9B Cross-sectional view of 9C). Figure 9A and 9B The cross section can be along Figure 4D The dividing plane 154 is shown as the cutoff point. (Refer to...) Figure 9Aand 9B (As shown and described above), the protrusion 128 of wedge 124 can be inserted into the recess 148 of wedge 144. Wedges 124 and 128 can be aligned with each other such that the lateral sides of wedges 124 and 144 are substantially coplanar. As described above, the annular protrusions 158 of the first and second radial members 150 and 152 are also inserted into the annular grooves 122 and 142 of the axial retainers 120 and 140 of the drive body 110 and the driven body 130, respectively. This keeps the drive body 110 and the driven body 130 axially opposed to each other, so that the drive body 110 cannot be axially separated from the driven body 130.

[0044] With the first and second radial members 150 and 152 positioned around wedges 124 and 144 such that the lateral sides of wedges 124 and 144 are close to the cam surfaces 156 of the first and second radial members 150 and 152 (within the wedge channel 155), a relatively small space may exist within the wedge channel 155 to allow for a small amount of movement of one of the wedges 124 or 144 while the other wedge 124 or 144 remains stationary. This small space... Figure 9C As can be seen. However, with any rotational movement of the wedge 124 (e.g., as...), Figure 9C As indicated by arrow 300 in the diagram, wedge 124 applies a force to the cam surfaces 156 of the first and second radial members 150 and 152, facing the leading edge of wedge 124. While wedge 144 does not necessarily move in response to movement of wedge 124 via any direct connection therebetween, the force exerted by wedge 124 on the cam surfaces 156 of the first and second radial members 150 and 152 can cause slight deformation (e.g., radially outward movement) of the first and second radial members 150 and 152. This radially outward movement will be resisted by an elastic element (i.e., cotter pin 200). In response to this resistance, the first and second radial members 150 and 152 will be carried with rotation of wedge 124, rather than deformed further. Wedge 144 will also be carried with rotation of the first and second radial members 150 and 152 through contact between the same cam surface 156 and the other lateral sides of wedge 144. (See reference...) Figure 9C As the wedge 124 rotates as indicated by arrow 300, force is applied to the cam surfaces 156 of the first and second radial members 150 and 152 in the direction and position indicated by arrow 310. Simultaneously, the movement of the first and second radial members 150 and 152 in the direction indicated by arrow 320 and at the position indicated by arrow 320 applies force to the other wedges 144 via the other cam surfaces 156.

[0045] By including a small amount of clearance in the wedge channel 155 and by the elasticity provided by the elastic member (i.e., the cotter pin 200), although the same torque is ultimately transmitted from the drive body 110 to the driven body 130, the force is distributed through the structure of the drill bit holder 100 in a less concentrated manner, thereby improving durability and reducing the chance of component failure of the drill bit holder 100 over time.

[0046] In one exemplary embodiment, the drive body 110 and the driven body 130 may be made of the same type of metallic material (e.g., steel or various alloys thereof). Meanwhile, the housing 220 may be made of a scratch-resistant or decorative material (e.g., plastic, nylon, or other moldable materials). However, in some embodiments, the housing 220 may also be designed to bear a load. Components of the torque transmission assembly (e.g., the first radial member 150 and the second radial member 152, the cotter pin 200, and the retaining clamp 210) may be made of the same or different materials, and may be made of metallic materials (e.g., steel or various alloys thereof). However, non-metallic components may also be used.

[0047] It should also be understood that torque transmission components can take different forms. For example, such as Figure 10 As shown, the same structure can be used for many components of the drill bit holder 100 described above. However, the elastic member 400 can be provided as a series of rings 410 extending around the first and second radial members 150 and 152 (thus replacing the cotter pin 200 and the retaining clamp 210).

[0048] As described above, 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 communicating) torque from the drive body 110 to the driven body 130. These two functions can be performed by corresponding different sub-assemblies, including an axial motion limiting sub-assembly and a rotation limiting sub-assembly. The axial motion limiting sub-assembly maintains the drive body 110 and the driven body 130 axially close to each other, while the rotation limiting sub-assembly limits the possible relative rotation between the drive body 110 and the driven body 130 in order to transmit torque from the drive body 110 to the driven body 130. However, it is worth noting that the rotation limiting sub-assembly and the axial motion limiting sub-assembly may share some components (i.e., some components may perform or cooperate with other components to perform the function of each respective sub-assembly).

[0049] Therefore, a drive device (e.g., a drill bit holder) of exemplary embodiments may be provided, or a torque transmission assembly included in such a drive device may be provided. The torque transmission assembly may include an axial motion limiting subassembly and a rotation limiting subassembly. The axial motion limiting subassembly is configured to hold the drive body of the drill bit holder near the driven body of the drill bit holder. The rotation limiting subassembly is configured such that the torque applied to the drive body is transmitted to the driven body. The rotation limiting subassembly includes a first cam body located at the distal end of the drive body and a second cam body located at the distal end of the driven body. The first and second cam bodies are configured to indirectly transmit most of the torque between the drive body and the driven body via the torque transmission assembly by limiting the rotation of the first cam body relative to the second cam body. For example, most of the torque may be about 80% to 100% of the torque, such that about 0% to 20% of the torque can be directly transmitted between the drive body and the driven body. Therefore, in some cases, the first and second cam bodies can be configured to transmit torque between the drive and driven bodies only indirectly via a torque transmission assembly by limiting the rotation of the first cam body relative to the second cam body. However, in other cases, a small amount of direct transmission may occur between the convex and concave portions at the corresponding ends of the drive and driven bodies. For example, a small portion of the torque, in this example between 0% and 20%, may be transmitted between the drive and driven bodies via a housing 220 that is elastically deformable during operation and may also have a first end and a second end respectively connected to the drive and driven bodies.

[0050] In some embodiments, the connector 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 torque transmission assembly may include a first radial member and a second radial member. The first and second radial members may be combined to form a generally cylindrical shape and define a wedge-shaped channel therebetween. The first and second radial members may form part of a rotation limiting subassembly and define a cam surface adjacent to the wedge-shaped channel. The cam surface may engage with a first cam body and a second cam body to transmit torque from the first cam body to the second cam body via the cam surface. In an exemplary embodiment, the rotation limiting subassembly may include a resilient member arranged to keep the first and second radial members close to each other and to resist radially outward movement of the first and second radial members in response to rotation of the first or second cam body. In some cases, the resilient member may include a cotter pin arranged to extend around the outer periphery of the first and second radial members. In an exemplary embodiment, the resilient member may also include a pair of limiting clamps disposed at opposite longitudinal ends of the cotter pin. In some cases, the resilient member may include a plurality of rings arranged to extend around the outer peripheries of the first radial member and the second radial member. In an exemplary embodiment, the drive body may include a first axial retainer disposed at a proximal end of the first cam body, and the driven body may include a second axial retainer disposed at a proximal end of the second cam body. The first and second axial retainers may each be part of an axial movement limiting subassembly. The first and second axial retainers may engage with the first and second radial members to prevent axial movement of the drive body and the driven body relative to each other. In some cases, the first and second radial members may each include an annular protrusion configured to insert into an annular groove disposed at each of the first and second axial retainers in each of the drive body and the driven body. In an exemplary embodiment, the first and second cam bodies may each include a first wedge and a second wedge. In some cases, the first wedge may include a protrusion at a distal end of the drive body, and the second wedge may include a recess disposed at a distal end of the driven body. The protrusion may be received in the recess to axially align the drive body and the driven body and to enable the drive body to rotate relative to the driven body (although limited by the rotation limiting subassembly). In some cases, the resilient member may include a housing arranged to extend around the outer periphery of the first radial member and the second radial member. In such an example, the housing may be configured to engage the driving member and the driven member to prevent axial movement of the driving member and the driven member relative to each other.

[0051] 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 be applicable 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 first cam body located at its distal end relative to the drive end; A driven body having a driven end configured to engage with a drill bit, the driven body including a second cam body located distal thereto relative to the driven end, the drive body and the first cam body being configured to rotate relative to the driven body and the second cam body; and A torque transmission assembly includes a wedge-shaped channel, a first radial member and a second radial member, and an elastic member, wherein the first radial member and the second radial member define a first cam surface and a second cam surface adjacent to the wedge-shaped channel, wherein the first cam surface and the second cam surface are adjacent to the first cam body and the second cam body and are configured to transmit torque between the drive body and the follower body. The first cam body and the second cam body are enclosed within the wedge-shaped channel of the torque transmission assembly. The first cam body, the second cam body, and the torque transmission assembly are configured to indirectly transmit most of the torque between the drive body and the driven body via the torque transmission assembly.

2. The impact drill bit holder according to claim 1, wherein, The first radial member and the second radial member are combined to form the wedge-shaped channel.

3. The impact drill bit holder of claim 2, wherein the elastic member is arranged to keep the first radial member and the second radial member close to each other and to resist radial outward movement of the first radial member and the second radial member in response to rotation of the first cam body or the second cam body.

4. The impact drill bit holder of claim 3, wherein the resilient member includes a cotter pin arranged to extend around the outer periphery of the first radial member and the second radial member.

5. The impact drill bit holder according to claim 4, wherein the elastic member further comprises a pair of restraining hoops disposed at opposite longitudinal ends of the cotter pin.

6. The impact drill bit holder of claim 3, wherein the elastic member comprises a plurality of rings arranged to extend around the outer periphery of the first radial member and the second radial member.

7. The impact drill bit holder of claim 3, wherein the elastic member comprises a housing arranged to extend around the outer periphery of the first radial member and the second radial member.

8. The impact drill bit holder of claim 7, wherein the housing is configured to engage the drive body and the driven body to prevent axial movement of the drive body and the driven body relative to each other.

9. The impact drill bit holder of claim 2, wherein the drive body includes a first axial retainer disposed near the proximal end of the first cam body relative to the drive end, and the driven body includes a second axial retainer disposed near the proximal end of the second cam body relative to the driven end. in, The first axial retainer and the second axial retainer engage with the first radial member and the second radial member to prevent the drive body and the driven body from moving axially relative to each other.

10. The impact drill bit holder of claim 9, wherein the first radial member and the second radial member each include an annular protrusion configured to insert into an annular groove disposed at each of the first axial retainer and the second axial retainer in each of the drive body and the driven body.

11. The impact drill bit holder according to claim 2, wherein the first cam body and the second cam body respectively include a first wedge and a second wedge.

12. The impact drill bit holder of claim 11, wherein the first wedge includes a protrusion at the distal end of the drive body relative to the drive end. in, The second wedge includes a recess located at the distal end of the driven body relative to the driven end, and The protrusion is received in the recess to axially align the drive body and the driven body, and to enable the drive body to rotate relative to the driven body.

13. The impact drill bit holder according to claim 1, wherein a majority of the torque comprises 80% to 100% of the torque.

14. A torque transmission assembly for a drill bit holder, the torque transmission assembly comprising: An axial movement limiting sub-assembly is configured to hold the drive body of the drill bit holder near the driven body of the drill bit holder; as well as A rotational limiting subassembly is configured such that the torque applied to the drive body is transmitted to the driven body. The rotation limiting sub-assembly includes a first cam body located at the distal end of the drive body relative to the drive end of the drive body, and a second cam body located at the distal end of the driven body relative to the driven end of the driven body. The first cam body and the second cam body are configured to transmit torque between the drive body and the driven body only indirectly via the torque transmission assembly by limiting the rotation of the first cam body relative to the second cam body. The rotation limiting sub-assembly further includes a radial member and an elastic member; The radial member includes a first radial member and a second radial member. A wedge-shaped channel is formed in the gap between the first radial member and the second radial member. A wedge is inserted into the wedge-shaped channel. The first radial member is placed near the wedge, such that the lateral side of the wedge is close to the cam surface of the first radial member.

15. The torque transmission assembly according to claim 14, in, The first radial member and the second radial member combine to form a substantially cylindrical shape and define the wedge-shaped channel therebetween. The first radial member and the second radial member form part of the rotation limiting subassembly and define a cam surface adjacent to the wedge-shaped channel, the cam surface engaging with the first cam body and the second cam body to transmit torque from the first cam body to the second cam body via the cam surface.

16. The torque transmission assembly of claim 14, wherein the elastic member is arranged to keep the first radial member and the second radial member close to each other and to resist radial outward movement of the first radial member and the second radial member in response to rotation of the first cam body or the second cam body.

17. The torque transmission assembly of claim 16, wherein the resilient member includes a cotter pin arranged to extend around the outer periphery of the first radial member and the second radial member, and the resilient member further includes a pair of restraining clamps arranged at opposite longitudinal ends of the cotter pin, or in, The elastic member includes a plurality of rings arranged to extend around the outer periphery of the first radial member and the second radial member, or The elastic member includes a housing arranged to extend around the periphery of the first radial member and the second radial member, the housing being configured to engage the drive body and the driven body to prevent axial movement of the drive body and the driven body relative to each other.

18. The torque transmission assembly of claim 14, wherein the drive body includes a first axial retainer disposed proximal to the first cam body relative to the drive end, and the driven body includes a second axial retainer disposed proximal to the second cam body relative to the driven end, the first axial retainer and the second axial retainer each being part of the axial movement limiting subassembly. in, The first axial retainer and the second axial retainer engage with the first radial member and the second radial member to prevent axial movement of the drive body and the driven body relative to each other, wherein the first radial member and the second radial member each include an annular protrusion configured to insert into an annular groove respectively disposed at each of the first axial retainer and the second axial retainer in each of the drive body and the driven body, and wherein the first cam body and the second cam body each include a first wedge and a second wedge.

19. The torque transmission assembly of claim 18, wherein the first wedge includes a protrusion at the distal end of the drive body relative to the drive end. in, The second wedge includes a recess located at the distal end of the driven body relative to the driven end, and The protrusion is received in the recess to axially align the drive body and the driven body, and to enable the drive body to rotate relative to the driven body.

20. The torque transmission assembly according to claim 15, wherein, The torque transmission assembly is configured to transmit 80% to 100% of the torque between the drive body and the driven body.

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