Reciprocating saw head and reciprocating saw

Abstract

This utility model discloses a reciprocating saw head and a reciprocating saw, relating to the field of medical device technology. The reciprocating saw head includes: a drive shaft; an input shaft, one end of which is sleeved with one end of the drive shaft; and a connecting member, including a rod and end stops at both ends of the rod. The rod radially penetrates the drive shaft and the input shaft, and the end stops prevent the rod from separating from the drive shaft and from the input shaft. The technical solution provided by this utility model improves the reliability of the connection between the input shaft and the drive shaft.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a reciprocating saw head and a reciprocating saw. Background Technology

[0002] A reciprocating saw is a commonly used orthopedic surgical cutting tool, generally consisting of a head, a power handle, and a saw blade. The head connects the power handle and the saw blade and transmits power.

[0003] The saw head typically houses a crank-connecting rod mechanism, a gear-cam combination mechanism, and other transmission mechanisms to convert the rotary motion of the motor in the power handle into the linear reciprocating motion of the saw blade. Between the motor and the transmission mechanism, the saw head also contains an input shaft for connecting the motor shaft and a drive shaft for connecting the transmission mechanism. The input shaft and the drive shaft are connected by cylindrical pins and then fixed by laser welding.

[0004] However, during long-term use of reciprocating saws, there is a risk that connecting parts such as cylindrical pins may fall off, reducing the reliability of the connection between the input shaft and the drive shaft. Utility Model Content

[0005] The main purpose of this invention is to provide a reciprocating saw head and a reciprocating saw, which aims to improve the reliability of the connection between the input shaft and the drive shaft.

[0006] To achieve the above objectives, the reciprocating saw head proposed in this utility model includes:

[0007] transmission shaft;

[0008] An input shaft, one end of which is sleeved with one end of the drive shaft; and

[0009] A connector includes a rod and end stops at both ends of the rod. The rod extends radially through the drive shaft and the input shaft. The end stops are used to prevent the rod from separating from the drive shaft and from the input shaft.

[0010] In one embodiment, the connector is a rivet.

[0011] In one embodiment, the input shaft is provided with a shaft hole extending along its own axial direction, and the input shaft is sleeved on the outside of the transmission shaft through the shaft hole.

[0012] In one embodiment, the drive shaft has a first mounting hole that extends radially through itself, the input shaft has two opposing second mounting holes corresponding to the first mounting hole, and the rod portion passes through the first mounting hole and the two second mounting holes.

[0013] In one embodiment, the rod portion has a transition fit or an interference fit with the first mounting hole; and / or,

[0014] The rod portion is fitted with or has an interference fit with the second mounting hole.

[0015] In one embodiment, the drive shaft and the shaft hole are either transition-fitted or interference-fitted.

[0016] In one embodiment, a transmission gear is provided at the end of the transmission shaft away from the input shaft;

[0017] The drive shaft is connected to the drive gear, or the drive shaft and the drive gear are an integral structure.

[0018] In one embodiment, the end of the input shaft away from the drive shaft is provided with a quick-change structure, which allows the reciprocating saw head to be detached relative to the power source.

[0019] In one embodiment, the reciprocating saw head further includes:

[0020] The housing has a receiving cavity, and the drive shaft and the input shaft are synchronously rotatable inside the receiving cavity; and

[0021] The bearing assembly abuts against the inner wall of the receiving cavity and is sleeved on the outside of at least one of the drive shaft and the input shaft.

[0022] This utility model also proposes a reciprocating saw, comprising:

[0023] The aforementioned reciprocating saw head;

[0024] A power handle is driven to the end of the input shaft furthest from the drive shaft; and

[0025] The saw blade, with the end of the drive shaft away from the input shaft being driven and connected to the saw blade.

[0026] The reciprocating saw head of this utility model includes a drive shaft, an input shaft, and a connector. One end of the input shaft is used to connect to the power handle, and the other end is sleeved with one end of the drive shaft, which helps to ensure the concentricity of the input shaft and the drive shaft. The rod of the connector passes through the drive shaft and the input shaft, allowing the drive shaft to rotate with the input shaft. The end stops at both ends of the rod prevent the rod from coming off, ensuring that the connector will not separate from the drive shaft and the input shaft, thereby improving the firmness of the connection between the drive shaft and the input shaft, and thus improving the reliability of the reciprocating saw head operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A cross-sectional view of a partial structure of an embodiment of the reciprocating saw head provided by this utility model. Figure 1 ;

[0029] Figure 2 A cross-sectional view of a partial structure of an embodiment of the reciprocating saw head provided by this utility model. Figure 2 ;

[0030] Figure 3 This is a cross-sectional view of an embodiment of the reciprocating saw head provided by this utility model;

[0031] Figure 4 A cross-sectional view of a partial structure of an embodiment of the reciprocating saw head provided by this utility model. Figure 3 .

[0032] Explanation of icon numbers:

[0033] 110. Drive shaft; 111. First mounting hole; 120. Drive gear;

[0034] 200. Input shaft; 201. Shaft hole; 202. Second mounting hole; 203. Quick-change structure;

[0035] 300. Connector; 310. Rod; 320. End stop;

[0036] 400. Casing;

[0037] 500. Bearing assembly; 510. Bearing; 520. Inner bushing; 530. Outer bushing;

[0038] 600, reciprocating shaft; 601, saw blade groove; 602, mounting groove; 603, positioning groove;

[0039] 700. Button component;

[0040] 800. Locking structure;

[0041] 900. Elastic component.

[0042] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection, a direct connection or an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] This utility model proposes a reciprocating saw head.

[0048] Please see Figure 1 , Figure 1 A cross-sectional view of a partial structure of an embodiment of the reciprocating saw head provided by this utility model. Figure 1 .

[0049] In one embodiment of this utility model, the reciprocating saw head includes:

[0050] Drive shaft 110;

[0051] Input shaft 200, one end of which is used to connect to the power handle, and the other end of which is sleeved with one end of drive shaft 110; and

[0052] The connector 300 includes a rod portion 310 and end stops 320 disposed at both ends of the rod portion 310. The rod portion 310 passes through the drive shaft 110 and the input shaft 200. The end stops 320 are used to prevent the rod portion 310 from separating from the drive shaft 110 and from the input shaft 200.

[0053] The reciprocating saw head of this utility model includes a drive shaft 110, an input shaft 200, and a connector 300. One end of the input shaft 200 is used to connect to the power handle, and the other end is sleeved with one end of the drive shaft 110, which helps to ensure the concentricity of the input shaft 200 and the drive shaft 110. The rod portion 310 of the connector 300 passes through the drive shaft 110 and the input shaft 200, allowing the drive shaft 110 to rotate with the input shaft 200. The end stops 320 at both ends of the rod portion 310 prevent the rod portion 310 from coming off, ensuring that the connector 300 will not separate from the drive shaft 110 and the input shaft 200, thereby improving the firmness of the connection between the drive shaft 110 and the input shaft 200, and thus improving the reliability of the reciprocating saw head operation.

[0054] The input shaft 200 and the transmission shaft 110 are connected in a manner that either the input shaft 200 is fitted outside the transmission shaft 110, or the transmission shaft 110 is fitted outside the input shaft 200.

[0055] In one embodiment, the connector 300 is a rivet.

[0056] In this embodiment of the invention, a rivet is used as the connecting member 300. The outer diameter of the head of one end of the rivet is larger than the outer diameter of the shank 310, forming an end stop 320. After the shank 310 of the rivet passes through the drive shaft 110 and the input shaft 200, the other end of the rivet can be hammered or pressed to deform it, thereby forming another end stop 320, thus preventing the rivet from falling off. As a standard part, the rivet is readily available, reducing the manufacturing cost of the connecting member 300, and the assembly process is relatively simple and quick. In addition, by applying a greater force, the deformable end of the rivet can produce greater deformation, which is equivalent to shortening the length of the shank 310, making the rivet more securely fixed, reducing the possibility of rivet movement, and further improving the firmness of the connection between the drive shaft 110 and the input shaft 200.

[0057] In one embodiment, the input shaft 200 is provided with a shaft hole 201 extending along its own axial direction, and the input shaft 200 is sleeved on the outside of the transmission shaft 110 through the shaft hole 201.

[0058] Reference Figures 1 to 2 In this embodiment of the invention, the input shaft 200 is provided with a shaft hole 201, and the input shaft 200 is sleeved on the outside of the transmission shaft 110. Specifically, in this embodiment, one end of the input shaft 200 needs to be sleeved on the outside of the transmission shaft 110, and the other end of the input shaft 200 needs to be provided with a quick-change structure 203 for docking with the power handle. Therefore, the input shaft 200 adopts a hollow design, which reduces the processing steps of the input shaft 200 and improves the convenience of manufacturing.

[0059] In one embodiment, the drive shaft 110 is provided with a first mounting hole 111 that extends radially through itself, the input shaft 200 is provided with two opposing second mounting holes 202 corresponding to the first mounting hole 111, and the rod portion 310 passes through the first mounting hole 111 and the two second mounting holes 202.

[0060] Reference Figures 1 to 2 In this embodiment of the invention, the first mounting hole 111 on the drive shaft 110 extends radially through itself, and the two second mounting holes 202 on the input shaft 200 are arranged opposite each other on both sides of the first mounting hole 111. Since the drive shaft 110 and the input shaft 200 are coaxial, the two second mounting holes 202 on the input shaft 200 extend radially along the input shaft 200, making it less likely for the first mounting hole 111 and the second mounting hole 202 to develop gaps, thus ensuring the strength of the input shaft 200 and the drive shaft 110 and reducing the possibility of damage to the input shaft 200 and the drive shaft 110. The rod portion 310 of the connector 300 passes through the first mounting hole 111 and the two second mounting holes 202, making the axial direction of the rod portion 310 perpendicular to the axial direction of the drive shaft 110 and the input shaft 200. This improves the uniformity of force transmission when the input shaft 200 drives the drive shaft 110 to rotate, thereby improving the stability of the rotation of the input shaft 200 and the drive shaft 110 and extending the service life of the reciprocating saw head.

[0061] In one embodiment, the rod portion 310 is fitted with the first mounting hole 111 via a transition fit or an interference fit; and / or,

[0062] The rod 310 has a transition fit or an interference fit with the second mounting hole 202.

[0063] In embodiments of this invention, the rod 310 and the first mounting hole 111 can be fitted with a transition fit, which reduces manufacturing difficulty, facilitates assembly, and lowers the manufacturing cost of the reciprocating saw head. Alternatively, the rod 310 and the first mounting hole 111 can be fitted with an interference fit, making the connection between the rod 310 and the drive shaft 110 tighter, thus making the connector 300 less prone to detachment and further improving the robustness and reliability of the connection between the drive shaft 110 and the input shaft 200. Furthermore, the interference fit prevents relative movement between the connector 300 and the drive shaft 110, thereby reducing vibration and noise during the operation of the reciprocating saw head.

[0064] In embodiments of this invention, the rod 310 and the second mounting hole 202 can be fitted with a transition fit, which reduces manufacturing difficulty, facilitates assembly, and lowers the manufacturing cost of the reciprocating saw head. Alternatively, the rod 310 and the second mounting hole 202 can be fitted with an interference fit, making the connection between the rod 310 and the input shaft 200 tighter, thus making the connector 300 less prone to detachment and further improving the robustness and reliability of the connection between the drive shaft 110 and the input shaft 200. Furthermore, the interference fit prevents relative movement between the connector 300 and the input shaft 200, thereby reducing vibration and noise during the operation of the reciprocating saw head.

[0065] In one embodiment, the drive shaft 110 is transition-fitted or interference-fitted with the shaft hole 201.

[0066] In embodiments of this invention, the drive shaft 110 and the shaft hole 201 can be fitted with an interference fit, which reduces manufacturing difficulty, facilitates assembly, and lowers the manufacturing cost of the reciprocating saw head. Alternatively, the drive shaft 110 and the shaft hole 201 can be fitted with an interference fit, making the connection between the input shaft 200 and the drive shaft 110 more secure, further improving the robustness and reliability of the connection between the drive shaft 110 and the input shaft 200. Furthermore, the interference fit prevents relative movement between the input shaft 200 and the drive shaft 110, thereby reducing vibration and noise during the operation of the reciprocating saw head.

[0067] In one embodiment, a transmission gear 120 is provided at the end of the transmission shaft 110 away from the input shaft 200;

[0068] The drive shaft 110 drives the drive gear 120, or the drive shaft 110 and the drive gear 120 are an integral structure.

[0069] Reference Figures 1 to 3In this embodiment of the invention, a transmission gear 120 is provided at the end of the transmission shaft 110 away from the input shaft 200. The transmission gear 120 is used to connect with subsequent transmission components to realize the functions of transmitting power and changing direction. The transmission shaft 110 can be connected to the transmission gear 120 by means of key connection, pin connection, etc., so that the rotation of the transmission shaft 110 can drive the rotation of the transmission gear 120, reducing the manufacturing difficulty of the transmission shaft 110 and the transmission gear 120; the transmission shaft 110 can also be integrally formed with the transmission gear 120 to ensure the connection strength between the transmission shaft 110 and the transmission gear 120 and improve service life.

[0070] In one embodiment, the input shaft 200 is provided with a quick-change structure 203 at the end away from the drive shaft 110. The quick-change structure 203 is used to make the reciprocating saw head detachable relative to the power source.

[0071] Reference Figures 1 to 3 In this embodiment of the invention, a quick-change structure 203 is provided at the end of the input shaft 200 away from the transmission shaft 110. The quick-change structure 203 enables quick and convenient connection or disconnection with the power source, improving work efficiency. The quick-change structure 203 can be implemented using various methods such as snap-fit, pin connection, or magnetic connection. Specifically, in this embodiment, the power source refers to a power handle, and the quick-change structure 203 includes multiple slots adapted to the power handle, which are evenly distributed along the outer periphery of the input shaft 200.

[0072] In one embodiment, the reciprocating saw head further includes:

[0073] The housing 400 has a receiving cavity, and the drive shaft 110 and input shaft 200 are synchronously rotatable inside the receiving cavity; and

[0074] The bearing assembly 500 abuts against the inner wall of the receiving cavity and is sleeved on the outside of at least one of the drive shaft 110 and the input shaft 200.

[0075] Reference Figure 3In an embodiment of this utility model, the reciprocating saw head further includes a housing 400 and a bearing assembly 500. The housing 400 has a receiving cavity, in which the drive shaft 110 and the input shaft 200 are both housed. The housing 400 protects the internal components, preventing them from being affected by external dust, moisture, and other factors, thus extending the service life of the reciprocating saw head. The bearing assembly 500 is fixed inside the housing 400, providing support for the drive shaft 110 and / or the input shaft 200. The bearing assembly 500 can be fitted only on the outside of the input shaft 200, only on the outside of the drive shaft 110, or on both the outside of the input shaft 200 and the drive shaft 110. The bearing assembly 500 helps reduce friction, making the rotation of the input shaft 200 and the drive shaft 110 smoother and more stable. Specifically, in this embodiment, the bearing assembly 500 includes two bearings 510, both of which are sleeved on the outside of the transmission shaft 110. An outer bushing 530 and an inner bushing 520 are provided between the two bearings 510. The outer bushing 530 separates the outer rings of the two bearings 510, and the inner bushing 520 separates the inner rings of the two bearings 510. The support provided by the two bearings 510 further improves the stability of the transmission shaft 110 rotating within the housing 400.

[0076] In one embodiment, the reciprocating saw head further includes:

[0077] The reciprocating shaft 600 and the drive shaft 110 are connected to the reciprocating shaft 600 via a drive assembly (not shown in the figure). The reciprocating shaft 600 is provided with a saw blade groove 601 for mounting a saw blade.

[0078] A button assembly 700 is disposed on the reciprocating axis 600 and is radially movable along the reciprocating axis 600;

[0079] The locking structure 800 has a first end and a second end. The first end is connected to the button assembly 700, and the second end passes through the reciprocating shaft 600. Driven by the button assembly 700, the second end can extend into the saw blade groove 601 to fix the saw blade within the groove 601, or the second end can exit the saw blade groove 601 to allow the saw blade to be inserted and removed relative to the groove 601.

[0080] An elastic element 900 is disposed between the button assembly 700 and the reciprocating shaft 600, and is used to drive the button assembly 700 to drive the second end of the locking structure 800 to extend into the saw blade groove 601.

[0081] Reference Figures 3 to 4In this embodiment of the invention, the reciprocating saw head further includes a reciprocating shaft 600, a button assembly 700, a locking structure 800, and an elastic element 900. When the user operates the button assembly 700 to insert the second end of the locking structure 800 into the saw blade groove 601, the second end of the locking structure 800 inserts into the limiting hole on the saw blade, thereby fixing the saw blade in the saw blade groove 601 and preventing the saw blade from falling off. When the user operates the button assembly 700 to remove the second end of the locking structure 800 from the saw blade groove 601, the second end of the locking structure 800 leaves the limiting hole on the saw blade, and the saw blade can be inserted and removed relative to the saw blade groove 601, realizing the disassembly, assembly, or replacement of the saw blade. The elastic element 900 provides a driving force to the button assembly 700, so that the button assembly 700 is maintained in the position where the second end of the locking structure 800 extends into the saw blade groove 601, thereby ensuring the firmness of the saw blade fixation and improving the convenience of using the reciprocating saw head.

[0082] Reference Figures 3 to 4 In an embodiment of this utility model, the button assembly 700 is sleeved on the outside of the reciprocating shaft 600. One side of the saw blade groove 601 on the reciprocating shaft 600 is provided with an avoidance hole for the locking structure 800 to pass through. The other side of the saw blade groove 601 is provided with an installation groove 602 on the outer wall opposite to the saw blade groove 601. The elastic element 900 is a cylindrical helical spring, with one end inserted into the installation groove 602 and the other end abutting against the inner wall of the button assembly 700.

[0083] Reference Figures 3 to 4 In the embodiments of this utility model, a plurality of mounting grooves 602 are provided along the axial direction of the reciprocating shaft 600, and an elastic element 900 is correspondingly provided in each mounting groove 602. By providing more elastic elements 900, a stronger driving force is provided for the button assembly 700, thereby ensuring the firmness of the locking structure 800.

[0084] Reference Figures 3 to 4 In an embodiment of this utility model, the inner wall of the saw blade groove 601 is also provided with a positioning groove 603. The positioning groove 603 is arranged opposite to the clearance hole. When the second end of the locking structure 800 extends into the saw blade groove 601, it actually passes through the saw blade groove 601 and extends into the positioning groove 603. This makes the two ends of the locking structure 800 restricted by the inner wall of the positioning groove 603 and the inner wall of the clearance hole, respectively, thereby improving the stability and firmness of the locking structure 800 in the saw blade groove 601, and thus improving the firmness of the saw blade fixation.

[0085] In an embodiment of this utility model, the reciprocating saw head further includes a front housing, which is sleeved over the reciprocating shaft 600 and located on both sides of the button assembly 700. The button assembly 700 has protrusions for user hand contact operation. When the button assembly 700 is in the position that drives the locking structure 800 out of the saw blade groove 601, the protrusions protrude from the outer surface of the front housing, and the user's fingers are not obstructed by the front housing, improving the ease of use of the button assembly 700 and ensuring that the locking structure 800 is fully disengaged.

[0086] This utility model also proposes a reciprocating saw, comprising:

[0087] The aforementioned reciprocating saw head;

[0088] The power handle is driven to the end of the input shaft 200 away from the drive shaft 110; and

[0089] The saw blade is driven by the end of the drive shaft 110 away from the input shaft 200.

[0090] The specific structure of the reciprocating saw head is as described in the above embodiments. Since this reciprocating saw adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0091] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A reciprocating saw head, characterized in that, include: transmission shaft; An input shaft, one end of which is sleeved with one end of the transmission shaft; as well as A connector includes a rod and end stops at both ends of the rod. The rod extends radially through the drive shaft and the input shaft. The end stops are used to prevent the rod from separating from the drive shaft and from the input shaft.

2. The reciprocating saw head as described in claim 1, characterized in that, The connector is a rivet.

3. The reciprocating saw head as described in claim 1, characterized in that, The input shaft has a shaft hole extending along its own axial direction, and the input shaft is sleeved on the outside of the transmission shaft through the shaft hole.

4. The reciprocating saw head as described in claim 3, characterized in that, The drive shaft is provided with a first mounting hole that penetrates it radially, and the input shaft is provided with two opposite second mounting holes corresponding to the first mounting hole. The rod passes through the first mounting hole and the two second mounting holes.

5. The reciprocating saw head as described in claim 4, characterized in that, The rod portion has a transition fit or interference fit with the first mounting hole; and / or The rod portion is fitted with or has an interference fit with the second mounting hole.

6. The reciprocating saw head as described in claim 3, characterized in that, The drive shaft is fitted with or has an interference fit with the shaft hole.

7. The reciprocating saw head as described in any one of claims 1 to 6, characterized in that, A transmission gear is provided at the end of the drive shaft away from the input shaft; The drive shaft is connected to the drive gear, or the drive shaft and the drive gear are an integral structure.

8. The reciprocating saw head as described in any one of claims 1 to 6, characterized in that, The input shaft is provided with a quick-change structure at the end away from the transmission shaft, the quick-change structure being used to make the reciprocating saw head detachable relative to the power source.

9. The reciprocating saw head as described in any one of claims 1 to 6, characterized in that, The reciprocating saw head also includes: The housing has a receiving cavity, and the drive shaft and the input shaft are synchronously rotatable inside the receiving cavity; and The bearing assembly abuts against the inner wall of the receiving cavity and is sleeved on the outside of at least one of the drive shaft and the input shaft.

10. A reciprocating saw, characterized in that, include: The reciprocating saw head as described in any one of claims 1 to 9; A power handle is connected to the end of the input shaft that is away from the drive shaft. as well as The saw blade, with the end of the drive shaft away from the input shaft being driven and connected to the saw blade.

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