Chuck assembly and jig saw

Abstract

The utility model belongs to the technical field of electric tools, and specifically relates to a chuck assembly and a jig saw. The clamping assembly includes a mounting rod and a positioning mechanism. Along the axial direction of the mounting rod, a receiving groove and a through groove connected to the receiving groove are provided in the mounting rod. The saw blade is detachably connected to the mounting rod through the positioning mechanism. The positioning mechanism includes a sliding sleeve and a positioning ball. The sliding sleeve is rotatably sleeved on the outer side of the mounting rod. The inner wall of the sliding sleeve is provided with a first avoidance groove matched with the through groove, and the depth of the first avoidance groove varies along the circumferential direction of the mounting rod. When the chuck assembly is in the first state, the positioning ball is accommodated in the through groove and abuts against the inner wall of the first avoidance groove and the positioning shoulder. When the chuck assembly is in the second state, part of the positioning ball is accommodated in the first avoidance groove, and the saw blade can be separated from the receiving groove. This embodiment simplifies the saw blade replacement operation and improves work efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, and in particular relates to a chuck assembly and a jigsaw. Background Art

[0002] In the existing market, the chuck design of the jigsaw has certain inconveniences. Specifically, when the user needs to replace the saw blade, two steps must be performed: first, the reciprocating rod needs to be pulled outward a certain distance, and secondly, the outer ring of the chuck needs to be rotated so that the saw blade can be loosened. For example, the patent publication number CN214769377U discloses a utility model patent for a quick jigsaw head for jigsaw blades, including a mounting rod, a positioning mechanism and a saw blade. The positioning mechanism includes a sliding sleeve, a positioning ball and a positioning protrusion. When the saw blade is installed, the sliding sleeve needs to be pulled down so that the positioning ball falls into the first avoidance groove of the sliding sleeve. After installation, the sliding sleeve is reset upward to drive the positioning ball to rest against the positioning protrusion for limiting. This design is not only cumbersome to operate, but also reduces work efficiency. Especially when the saw blade needs to be replaced frequently, it brings great inconvenience to the user. Utility Model Content

[0003] The purpose of the utility model is to at least solve the problem that the user needs to complete two steps to loosen the saw blade. This purpose is achieved through the following technical solutions:

[0004] The first aspect of the utility model provides a chuck assembly, which is used to clamp a saw blade and is connected to a tool body, wherein the saw blade has a positioning shoulder and comprises:

[0005] A mounting rod, wherein a receiving groove is provided in the mounting rod along the axial direction of the mounting rod, the receiving groove is used to receive the saw blade, and a through groove is provided in the mounting rod perpendicular to the axial direction and connected to the receiving groove;

[0006] A positioning mechanism, wherein the saw blade is detachably connected to the mounting rod through the positioning mechanism, the positioning mechanism comprising a sliding sleeve and a positioning ball, the sliding sleeve is rotatably sleeved on the outer side of at least a portion of the mounting rod, and along the circumferential direction of the mounting rod, a first avoidance groove matching the through groove is provided on the inner wall of the sliding sleeve, and the depth of the first avoidance groove increases or decreases sequentially along the circumferential direction;

[0007] Among them, when the chuck assembly is in the first state, the positioning ball is accommodated in the through groove and is configured to abut against the inner wall of the first avoidance groove and the positioning shoulder respectively; when the chuck assembly is in the second state, part of the positioning ball is accommodated in the first avoidance groove and is configured to be separated from the positioning shoulder.

[0008] According to the chuck assembly of the utility model, by utilizing the receiving groove arranged along the axial direction inside the mounting rod and the through groove perpendicular to the axial direction, as well as the first avoidance groove and the positioning ball on the matching sliding sleeve, the user can directly realize the quick loosening of the saw blade only by rotating the sliding sleeve. In this process, the positioning ball moves between the through groove and the first avoidance groove, and the user does not need to pull out the reciprocating rod. When in the first state (the state where the saw blade is fixed), the inner wall of the first avoidance groove abuts the positioning ball, so that the positioning ball clamps the saw blade. This design not only greatly simplifies the saw blade replacement operation and improves work efficiency, but also reduces the risk of misoperation that may occur during the operation and enhances the safety of the tool. Therefore, the chuck assembly of this embodiment not only improves the convenience of use and operating efficiency, but also ensures the safety and reliability of operation.

[0009] In addition, the chuck assembly according to the utility model may also have the following additional technical features:

[0010] In some embodiments of the utility model, a limit groove is provided on the sliding sleeve along the circumferential direction of the mounting rod, a limit clamping ring is connected to the mounting rod, and at least part of the limit clamping ring is arranged in the limit groove and cooperates with the limit groove.

[0011] In some embodiments of the utility model, an annular boss is provided on the outer side of the mounting rod, the limiting clamp is clamped between the annular boss and the sliding sleeve, one side of the limiting clamp abuts against the annular boss, and the other side of the limiting clamp abuts against the sliding sleeve.

[0012] In some embodiments of the utility model, the chuck assembly also includes a return spring, which is sleeved on the outside of the mounting rod, one end of the return spring in the axial direction is connected to the mounting rod, and the other end of the return spring in the axial direction is connected to the sliding sleeve, and the return spring is configured to drive the sliding sleeve to return from the second state to the first state.

[0013] In some embodiments of the present invention, along a plane perpendicular to the saw blade, a cross-section of the first avoidance groove is in a half-tear drop shape.

[0014] In some embodiments of the present invention, a protrusion is provided on the outer side of the sliding sleeve.

[0015] In some embodiments of the utility model, the chuck assembly further comprises a pressing ball, the mounting rod is provided with a through hole, and the inner wall of the sliding sleeve is provided with a second avoidance groove matched with the through hole;

[0016] When the chuck assembly is in the first state, the clamping ball is accommodated in the through hole and is configured to abut against the inner wall of the second avoidance groove and the side of the saw blade. When the chuck assembly is in the second state, part of the clamping ball is accommodated in the second avoidance groove and is configured to separate the side of the saw blade.

[0017] In some embodiments of the present invention, the through groove is circular.

[0018] A second aspect of the utility model provides a jigsaw, comprising:

[0019] Tool body;

[0020] Saw blades;

[0021] In the above-mentioned chuck assembly, the saw blade is arranged in the receiving groove of the mounting rod and is connected to the tool body through the chuck assembly.

[0022] In some embodiments of the utility model, the tool body includes a reciprocating rod, the reciprocating rod is connected to the mounting rod of the chuck assembly, and the inner cavity of the reciprocating rod is communicated with the receiving groove of the mounting rod, and an elastic structure is provided on the inner wall of the reciprocating rod, the elastic structure abuts against the saw blade, and the elastic structure can drive the saw blade out of the receiving groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 The structure diagram of a part of the jigsaw according to the embodiment of the utility model is schematically shown;

[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 Schematically shows a front view of a portion of a jigsaw according to an embodiment of the present invention;

[0027] Figure 4 When the chuck assembly is in the first state Figure 3 Sectional view of the middle BB plane;

[0028] Figure 5 When the chuck assembly is in the second state Figure 3 Sectional view of the middle BB plane;

[0029] Figure 6 The structure diagram of a part of the jigsaw (when the sliding sleeve is hidden) according to the embodiment of the utility model is schematically shown;

[0030] Figure 7 Schematically shows a front view of a portion of a jigsaw (with the sliding sleeve hidden) according to an embodiment of the utility model;

[0031] Figure 8 for Figure 7 Sectional view of the middle CC plane;

[0032] Fig. 9 Schematically shows a top view of a portion of a jigsaw (with the sliding sleeve hidden) according to an embodiment of the utility model;

[0033] Fig.10 for Fig. 9 Sectional view of the middle DD plane.

[0034] The reference numerals are as follows:

[0035] 100, chuck assembly;

[0036] 10. Mounting rod; 11. Through slot; 12. Accommodating slot; 13. Annular boss; 20. Positioning mechanism; 21. Positioning ball;

[0037] 22, sliding sleeve; 221, protrusion; 222, limiting groove; 223, first avoidance groove; 224, second avoidance groove; 23, pressing ball; 30, limiting snap ring; 40, return spring;

[0038] 200. jigsaw; 201. saw blade; 202. reciprocating rod; 203. crank connecting rod; 204. elastic structure. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0041] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0042] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0043] For the convenience of description, the structure of the saw blade is first explained. The saw blade has a main body, on which are saw teeth, two side surfaces are respectively provided on both sides of the saw teeth, and a positioning shoulder is also provided on the main body, and the positioning shoulder is provided between the two side surfaces in the same direction as the setting of the saw teeth. The positioning shoulder is provided with a convex block to match the positioning mechanism (such as a positioning ball) in the chuck assembly to ensure the stability and accuracy of the saw blade installation.

[0044] like Figures 1 to 10As shown, according to an embodiment of the present utility model, a chuck assembly 100 is proposed, which is used to clamp a saw blade 201 and is connected to a tool body, wherein the clamp assembly includes a mounting rod 10 and a positioning mechanism 20, wherein the mounting rod 10 is provided with a receiving groove 12 along the axial direction of the mounting rod 10, and the receiving groove 12 is used to receive the saw blade 201, and the mounting rod 10 is provided with a through groove 11 in a direction perpendicular to the axial direction and connected to the receiving groove 12. The saw blade 201 is detachably connected to the mounting rod 10 through the positioning mechanism 20, and the positioning mechanism 20 includes a sliding sleeve 22 and a positioning ball 21, and the sliding sleeve 22 is rotatably sleeved on the outer side of at least part of the mounting rod 10, and along the circumferential direction of the mounting rod 10, a first avoidance groove 223 matching with the through groove 11 is provided on the inner wall of the sliding sleeve 22, and the depth of the first avoidance groove 223 changes (increases or decreases in sequence) along the circumferential direction of the mounting rod 10, and has different depths. Among them, when the chuck assembly 100 is in the first state, the positioning ball 21 is accommodated in the through groove 11 and abuts against the inner wall and the positioning shoulder of the first avoidance groove 223. When the chuck assembly 100 is in the second state, part of the positioning ball 21 is accommodated in the first avoidance groove 223, and the saw blade 201 can be separated from the accommodating groove 12.

[0045] According to the chuck assembly 100 of this embodiment, by utilizing the receiving groove 12 arranged along the axial direction inside the mounting rod 10 and the through groove 11 perpendicular to the axial direction, as well as the first avoidance groove 223 and the positioning ball 21 on the matching sliding sleeve 22, the user can directly realize the quick release of the saw blade 201 by simply rotating the sliding sleeve 22. In this process, the positioning ball 21 moves between the through groove 11 and the first avoidance groove 223, and the user does not need to pull out the reciprocating rod 202. When it is in the first state (the state where the saw blade 201 is fixed), the inner wall of the first avoidance groove 223 abuts against the positioning ball 21, so that the positioning ball 21 clamps the saw blade 201. This design not only greatly simplifies the replacement operation of the saw blade 201 and improves work efficiency, but also reduces the risk of misoperation that may occur during the operation, and enhances the safety of the tool. Therefore, the chuck assembly 100 of this embodiment improves the convenience of use and the operating efficiency while also ensuring the safety and reliability of the operation.

[0046] It can be understood that the specific steps of replacing the saw blade 201 using the chuck assembly 100 provided in this embodiment are described as follows: First, the user inserts the saw blade 201 along the axial direction of the mounting rod 10 so that it is located in the receiving groove 12, and ensures that the positioning shoulder of the saw blade 201 is aligned with the positioning mechanism 20 of the chuck assembly 100. The user then rotates the sliding sleeve 22 located on the outer side of the mounting rod 10. The first avoidance groove 223 on the inner wall of the sliding sleeve 22 cooperates with the through groove 11, and the internal positioning ball 21 is driven to move along the first avoidance groove 223 and the through groove 11 through the rotation of the sliding sleeve 22. When the chuck assembly 100 is in the first state (i.e., the working state), the positioning ball 21 is accommodated in the through groove 11, and abuts against the inner wall of the first avoidance groove 223 and the positioning shoulder of the saw blade 201. At this time, the saw blade 201 is firmly clamped and can perform normal sawing work. When the saw blade 201 needs to be replaced, the user continues to rotate the sleeve 22 until the chuck assembly 100 reaches the second state, at which time the positioning ball 21 is guided and accommodated in the first avoidance groove 223, and the contact between the saw blade 201 and the positioning ball 21 is released, so that the saw blade 201 can freely escape from the receiving groove 12. The user can now easily remove the old saw blade 201 and insert a new saw blade 201 in the same way, and then reset the positioning ball 21 by rotating the sleeve 22 in the opposite direction to complete the replacement process of the saw blade 201. After the saw blade 201 is inserted and positioned, the user releases the sleeve 22, and the reset spring 40 automatically drives the sleeve 22 back to the original position (the first state), ensuring that the new saw blade 201 is firmly clamped and ready for the next step of sawing.

[0047] It can be understood that there are two first avoidance grooves 223 and two positioning balls 21 , and the two first avoidance grooves 223 are symmetrically arranged along the axis of the mounting rod 10 to further clamp the saw blade 201 .

[0048] It is understandable that, along the circumferential direction of the mounting rod 10, a limiting groove 222 is provided on the sliding sleeve 22, and a limiting snap ring 30 is connected to the mounting rod 10, and the limiting snap ring 30 is provided in the limiting groove 222, and the limiting snap ring 30 cooperates with the limiting groove 222 to prevent the sliding sleeve 22 from excessively rotating. Since the first avoidance groove 223 has an arc, when rotating the sliding sleeve 22, the user may use too much force to cause the positioning ball 21 to disengage from the first avoidance groove 223, therefore, by providing the limiting groove 222 and the limiting snap ring 30, the rotation angle of the sliding sleeve 22 is further limited to prevent the sliding sleeve 22 from excessively rotating.

[0049] It can be understood that an annular boss 13 is provided on the outer side of the mounting rod 10, and a limiting snap ring 30 is sandwiched between the annular boss 13 and the sliding sleeve 22, one side of the limiting snap ring 30 abuts against the annular boss 13, and the other side of the limiting snap ring 30 abuts against the sliding sleeve 22. The limiting snap ring 30 is provided between the annular boss 13 and the sliding sleeve 22 to prevent it from falling off.

[0050] It is understandable that the chuck assembly 100 further includes a return spring 40, which is sleeved on the outside of the mounting rod 10, one end of the return spring 40 in the axial direction is connected to the mounting rod 10, and the other end of the return spring 40 in the axial direction is connected to the sliding sleeve 22, and the return spring 40 drives the sliding sleeve 22 to rotate to the first state. The return spring 40 drives the sliding sleeve 22 to automatically return from the second state to the first state, and under certain conditions, such as when the saw blade 201 is replaced, provides an appropriate reverse force to ensure that the sliding sleeve 22 can transition to the first state (i.e., the locked position) more smoothly. After the user completes the replacement of the saw blade 201 and releases the sliding sleeve 22, the return spring 40 can not only automatically pull the sliding sleeve 22 back to the first state, but also assist in locking the sliding sleeve 22 through the reverse force, thereby reducing manual adjustments during the operation, thereby speeding up the operation process and reducing the complexity of the operation.

[0051] It is understandable that if Figure 4 and Figure 5 , along the plane perpendicular to the saw blade 201, the cross-section of the first avoidance groove 223 is half-teardrop-shaped. The half-teardrop-shaped design can guide the positioning ball 21 to slide along the avoidance groove more naturally and smoothly. This shape conforms to the principles of fluid dynamics and has a good guiding effect even in solid physics, so that the positioning ball 21 encounters less resistance when sliding in or out of the avoidance groove. In addition, by optimizing the moving path of the positioning ball 21, the accuracy of positioning is enhanced. The half-teardrop-shaped avoidance groove can effectively guide the positioning ball 21 to the predetermined position, thereby ensuring the stability of the saw blade 201 during installation and the accuracy of repeated positioning.

[0052] It is understandable that the outer side of the sliding sleeve 22 is provided with a protrusion 221. The protrusion 221 provides the user with a better grip and anti-slip effect. This design allows the user to firmly grasp the sliding sleeve 22 even if there is sweat or grease on the hands during use, reducing the risk of slipping or loss of control. In addition, the protrusion 221 can serve as a directional guide during operation, helping the user to more accurately control the rotation angle and position of the sliding sleeve 22, thereby improving the accuracy and convenience of installing and removing the saw blade 201.

[0053] It can be understood that the chuck assembly 100 further includes a pressing ball 23, a through hole is provided on the mounting rod 10, and a second avoidance groove 224 matching the through hole is provided on the inner wall of the sliding sleeve 22. When the chuck assembly 100 is in the first state, the pressing ball 23 is received in the through hole and abuts against the inner wall of the second avoidance groove 224 and the side of the saw blade 201. When the chuck assembly 100 is in the second state, part of the pressing ball 23 is received in the second avoidance groove 224, and the pressing ball 23 is separated from the side of the saw blade 201. The pressing ball 23 is located in the through hole of the mounting rod 10 and abuts against the side of the saw blade 201 in the first state of the chuck assembly 100. Such physical contact increases the friction between the saw blade 201 and the chuck assembly 100, effectively preventing the saw blade 201 from sliding or deflecting during violent movement, and ensuring the stability and accuracy of the cutting process. When the chuck assembly 100 is switched to the second state, the pressing ball 23 partially enters the second avoidance groove 224 and separates from the side of the saw blade 201. This design allows the saw blade 201 to be easily loosened and replaced, greatly simplifying the operation process of replacing the saw blade 201 and improving work efficiency.

[0054] It is understandable that the through slot 11 is circular, and the diameter of the through slot 11 is slightly larger than the positioning ball 21, and the through slot 11 accommodates the positioning ball 21. Since the diameter of the through slot 11 is slightly larger than the positioning ball 21, the positioning ball 21 can be easily moved in the through slot 11, thereby simplifying the installation and removal process of the saw blade 201. When the user replaces the saw blade 201, the operation can be completed more quickly and conveniently, thereby improving work efficiency.

[0055] This embodiment further provides a jigsaw 200 , which includes a tool body, a saw blade 201 and a chuck assembly 100 . The saw blade 201 is disposed in the receiving groove 12 , and the saw blade 201 is connected to the tool body through the chuck assembly 100 .

[0056] It can be understood that the tool body includes a reciprocating rod 202, the reciprocating rod 202 is connected to the mounting rod 10 of the chuck assembly 100, and the inner cavity of the reciprocating rod 202 is communicated with the receiving groove 12 of the mounting rod 10, and an elastic structure 204 is provided on the inner wall of the reciprocating rod 202, and the elastic structure 204 can make a spring, and the elastic structure 204 can abut against the saw blade 201, and the elastic structure 204 can drive the saw blade 201 out of the receiving groove 12.

[0057] It can be understood that the tool body also includes a crank connecting rod 203, and an eccentric wheel is arranged on the transmission shaft of the motor. The eccentric wheel is connected to the reciprocating rod 202 through the crank connecting rod 203 mechanism. When the eccentric wheel or the cam rotates, they convert the rotational motion into the linear reciprocating motion of the reciprocating rod 202 through the crank connecting rod 203.

[0058] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A chuck assembly, the chuck assembly is used to clamp a saw blade and is connected to a tool body, the saw blade has a positioning shoulder, characterized in that: include: A mounting rod, wherein a receiving groove is provided in the mounting rod along the axial direction of the mounting rod, the receiving groove is used to receive the saw blade, and a through groove is provided in the mounting rod perpendicular to the axial direction and connected to the receiving groove; A positioning mechanism, wherein the saw blade is detachably connected to the mounting rod through the positioning mechanism, the positioning mechanism comprising a sliding sleeve and a positioning ball, the sliding sleeve is rotatably sleeved on the outer side of at least a portion of the mounting rod, and along the circumferential direction of the mounting rod, a first avoidance groove matching the through groove is provided on the inner wall of the sliding sleeve, and the depth of the first avoidance groove increases or decreases sequentially along the circumferential direction; Among them, when the chuck assembly is in the first state, the positioning ball is accommodated in the through groove and is configured to abut against the inner wall of the first avoidance groove and the positioning shoulder respectively; when the chuck assembly is in the second state, part of the positioning ball is accommodated in the first avoidance groove and is configured to be separated from the positioning shoulder.

2. The chuck assembly according to claim 1, characterized in that A limiting groove is provided on the sliding sleeve along the circumferential direction of the mounting rod, and a limiting clamp ring is connected to the mounting rod. At least a part of the limiting clamp ring is arranged in the limiting groove and cooperates with the limiting groove.

3. The chuck assembly according to claim 2, characterized in that An annular boss is arranged on the outer side of the mounting rod, the limiting snap ring is clamped between the annular boss and the sliding sleeve, one side of the limiting snap ring abuts against the annular boss, and the other side of the limiting snap ring abuts against the sliding sleeve.

4. The chuck assembly according to claim 1, characterized in that The chuck assembly also includes a return spring, which is sleeved on the outside of the mounting rod, one end of the return spring in the axial direction is connected to the mounting rod, and the other end of the return spring in the axial direction is connected to the sliding sleeve, and the return spring is configured to drive the sliding sleeve to return from the second state to the first state.

5. The chuck assembly according to claim 1, characterized in that Along a plane perpendicular to the saw blade, a cross section of the first avoidance groove is in a half-tear drop shape.

6. The chuck assembly according to any one of claims 1 to 5, characterized in that: A protrusion is arranged on the outer side of the sliding sleeve.

7. The chuck assembly according to any one of claims 1 to 5, characterized in that: The chuck assembly also includes a pressing ball, the mounting rod is provided with a through hole, and the inner wall of the sliding sleeve is provided with a second avoidance groove matched with the through hole; When the chuck assembly is in the first state, the clamping ball is accommodated in the through hole and is configured to abut against the inner wall of the second avoidance groove and the side of the saw blade. When the chuck assembly is in the second state, part of the clamping ball is accommodated in the second avoidance groove and is configured to be separated from the side of the saw blade.

8. The chuck assembly according to any one of claims 1 to 5, characterized in that: The through groove is circular.

9. A jigsaw, characterized in that: include: Tool body; Saw blades; According to the chuck assembly according to any one of claims 1 to 8, the saw blade is arranged in a receiving groove of the mounting rod, and the saw blade is connected to the tool body through the chuck assembly.

10. The jig saw according to claim 9, characterized in that The tool body includes a reciprocating rod, which is connected to the mounting rod of the chuck assembly, and the inner cavity of the reciprocating rod is communicated with the receiving groove. An elastic structure is provided on the inner wall of the reciprocating rod, and the elastic structure abuts against the saw blade. The elastic structure can drive the saw blade out of the receiving groove.

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