Saw blade quick-clamp structure and reciprocating saw

Abstract

This application relates to the field of power tools, specifically to a saw blade quick-clamp structure and a reciprocating saw. The saw blade quick-clamp structure includes an inner chuck ring, a first positioning element, a second positioning element, and an outer chuck ring. An elastic reset element is connected to one side of the outer chuck ring. When the outer chuck ring is in a first rotational position relative to the inner chuck ring, its inner wall surface can press against the first positioning element and / or the second positioning element, thereby forming a clamping force between the first and second positioning elements to clamp and fix the saw blade body. When the outer chuck ring is in a second rotational position relative to the inner chuck ring, the clamping force of the first and second positioning elements on the saw blade body is released. The saw blade quick-clamp structure also includes a circumferentially limited locking element. Under the action of elastic force, the locking element can approach the outer chuck ring, so that the outer chuck ring is circumferentially locked and held in the second rotational position. After the saw blade quick-clamp structure is installed on the reciprocating saw, the saw blade can be quickly installed and removed with one hand. The quick-clamp structure is self-locking and anti-reset when it is released.

Description

Technical Field

[0001] This application relates to the field of power tools, and in particular to a saw blade quick-clamp structure and a reciprocating saw. Background Technology

[0002] A reciprocating saw is an electric tool that cuts by the high-speed reciprocating motion of a saw blade. The saw blade needs to be replaced frequently to adapt to different working conditions. Traditional saw blade clamping mechanisms mostly use bolt fastening or pressure block structures, which have problems such as cumbersome operation, easy jamming, and low replacement efficiency.

[0003] In existing technologies, such as the "reciprocating saw blade clamping mechanism" disclosed in patent CN208276286U, the clamping and releasing of the blade is achieved by rotating the outer ring of the chuck to drive the pin to slide along the Archimedean spiral trajectory. Although this mechanism solves the jamming problem of the pressure block structure, it still has the following drawbacks:

[0004] Insufficient ease of operation: When changing the saw blade, the outer ring of the chuck must be manually rotated while simultaneously maintaining the position of the saw blade, making it impossible to operate with one hand;

[0005] No self-locking function: When changing the saw blade, the outer ring of the chuck needs to be kept loose by continuous external force, and it is easy to accidentally reset during the replacement process. Utility Model Content

[0006] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a saw blade quick clamp structure and a reciprocating saw.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A saw blade quick-clamp structure includes:

[0009] Chuck inner ring;

[0010] The first positioning element and the second positioning element are both installed on the inner ring of the chuck.

[0011] The outer ring of the chuck is fitted outside the inner ring of the chuck, and a resilient reset element is connected to one side.

[0012] The outer ring of the chuck is configured as follows:

[0013] When the outer ring of the collet is in the first rotational position relative to the inner ring of the collet, its inner wall surface can press the first positioning element and / or the second positioning element, so that a clamping force is formed between the first positioning element and the second positioning element to clamp and fix the saw blade body.

[0014] When the outer ring of the collet is in the second rotational position relative to the inner ring of the collet, the squeezing force of its inner wall against the first positioning member and / or the second positioning member disappears, and the clamping force of the first positioning member and the second positioning member on the saw blade body is released.

[0015] The power required for the outer ring of the chuck to change from the second rotational position to the first rotational position is provided by the deformed elastic reset member.

[0016] The saw blade quick clamp structure also includes a locking member that is circumferentially limited. Under the action of elastic force, the locking member can approach the outer ring of the chuck, so that the outer ring of the chuck is circumferentially locked and held in the second rotation position, and the elastic reset member is in an energy storage state.

[0017] When the saw blade body is inserted into the inner ring of the chuck, it is suitable to trigger the locking element to separate the locking element from the outer ring of the chuck. The elastic reset element drives the outer ring of the chuck to switch to the first rotation position, and the first positioning element and the second positioning element clamp and fix the saw blade body.

[0018] Furthermore, when the outer ring of the chuck changes from the first rotational position to the second rotational position under the drive of external force, the clamping force of the first positioning member and the second positioning member on the saw blade body is released, and the locking member pushes the saw blade body out of the clamping space between the first positioning member and the second positioning member under the action of elasticity, and locks the outer ring of the chuck in the second rotational position.

[0019] Furthermore, the saw blade quick clamp structure also includes a slide bar body, with the inner ring of the chuck sleeved on the outside of the slide bar body, a clamping opening at one end of the slide bar body, and a first mounting hole and a second mounting hole communicating with the clamping opening on the surface of the slide bar body;

[0020] One end of the first positioning member passes through the first mounting hole and extends into the clamping opening, and one end of the second positioning member passes through the second mounting hole and extends into the clamping opening. After installation, the first positioning member and the second positioning member keep the inner ring of the chuck and the slide bar body mutually circumferentially limited.

[0021] When the saw blade body is installed, one end of it extends into the clamping opening and is clamped and fixed by the first positioning component and the second positioning component.

[0022] Furthermore, the inner wall surface of the outer ring of the chuck is provided with at least one arc-shaped groove corresponding to the first positioning member. When the outer ring of the chuck changes from the second rotation position to the first rotation position, the arc-shaped groove rotates relative to the first positioning member, and its wall surface gradually squeezes the first positioning member, so that the end of the first positioning member approaches the second positioning member, thereby forming a clamping force.

[0023] Furthermore, the relative rotational trajectory between the arc-shaped groove and the first positioning element is an Archimedean spiral.

[0024] Furthermore, a protective sleeve is installed on the slide bar body, and an elastic element is installed on the protective sleeve. One end of the elastic element is connected to a locking element, and a locking groove corresponding to the locking element is provided on the outer ring of the clamp.

[0025] The locking element is configured as follows:

[0026] When the saw blade body is inserted into the clamping port, it triggers the locking element, causing the locking element to separate from the locking groove. The elastic reset element drives the outer ring of the chuck to rotate to the first rotation position, the locking groove and the locking element are misaligned, and the first positioning element and the second positioning element clamp and fix the saw blade body.

[0027] When the outer ring of the chuck changes from the first rotation position to the second rotation position under the drive of external force, the locking groove corresponds to the locking member, the clamping force of the first positioning member and the second positioning member on the saw blade body is released, and the locking member pushes the saw blade body out from the clamping space between the first positioning member and the second positioning member under the elastic force of the elastic member. The locking member extends into the locking groove and matches the locking groove, and locks the outer ring of the chuck in the second rotation position.

[0028] Furthermore, the elastic reset element is a torsion spring, with one end connected to the sheath and the other end connected to the outer ring of the clamp.

[0029] Furthermore, a limiting rod is provided on the sheath, which passes through the clamping opening. The sheath is circumferentially limited on the slide bar body through the cooperation between the limiting rod and the clamping opening.

[0030] Furthermore, the end of the first positioning member closest to the second positioning member is a tapered end.

[0031] Furthermore, the slide bar body is provided with a through-hole limiting groove, and the locking member passes through the limiting groove. The limiting groove is configured to allow the locking member to move in the direction of approaching and moving away from the outer ring of the chuck, while restricting the rotation of the locking member in the circumferential direction.

[0032] Another saw blade quick-clamp structure provided in this application includes:

[0033] Chuck inner ring;

[0034] The outer ring of the chuck has a locking groove on its circumference and is fitted onto the outside of the inner ring of the chuck, and is connected to an elastic reset member;

[0035] The slide bar body is provided with a clamping opening for holding the saw blade and a through limiting groove;

[0036] A locking element, which passes through the limiting groove;

[0037] An elastic element connects to the locking element and applies an elastic force toward the outer ring of the collet;

[0038] Its features are:

[0039] When the saw blade is not installed, the locking member maintains a limited fit with the locking groove under the action of elastic force, the outer ring of the chuck is locked in the second rotation position, and the elastic reset member is in an energy storage state.

[0040] When the saw blade is inserted into the clamping port, the end of the saw blade pushes the locking member to compress the elastic member and disengage from the locking groove, releasing the locking of the outer ring of the chuck. Under the reset action of the elastic reset member, the outer ring of the chuck automatically rotates to the first rotation position to squeeze the positioning member to clamp the saw blade.

[0041] When an external force drives the outer ring of the chuck to rotate from the first rotation position to the second rotation position, the locking groove aligns with the locking member, and the elastic member drives the locking member to move and spring into the locking groove, so that the locking member pushes the saw blade, ejects the saw blade from the clamping opening, and locks the outer ring of the chuck in the second rotation position.

[0042] Furthermore, the limiting groove is configured as follows:

[0043] The locking element is allowed to move axially along the slide bar body;

[0044] The locking element is prohibited from rotating circumferentially.

[0045] Furthermore, when the outer ring of the chuck rotates to the second rotation position, the central axis of the locking groove is parallel to or coincides with the locking member;

[0046] When the outer ring of the chuck rotates to the first rotation position, the axis of the locking groove is misaligned with the locking member, and the outer ring of the chuck is pressed against the positioning member by the arc-shaped groove arranged on its inner wall surface.

[0047] The advantages of the saw blade quick-clamp structure provided in this application compared to the prior art are as follows:

[0048] 1. This application enables quick one-handed assembly and disassembly of saw blades. Through the linkage design of the locking component and saw blade insertion, inserting the saw blade automatically triggers clamping (the locking component releases the outer ring of the chuck, and the elastic reset component drives the reset). When disassembling, the saw blade automatically pops out (external force rotates the outer ring of the chuck to the second position, the locking component pushes out the saw blade and locks the mechanism). No auxiliary tools or two-handed operation are required throughout the process.

[0049] 2. The quick-clamp structure of this application is self-locking and anti-reset when it is in the loose state. When the clamping force of the saw blade is released, the locking member locks the outer ring of the chuck in the second rotation position under the action of the elastic force, ensuring that the mechanism stably maintains the loose state during the saw blade replacement process, and completely solving the operational burden and accidental reset risk of the prior art that requires continuous force to maintain the loose state.

[0050] 3. When the outer ring of the chuck rotates to the second position, the locking element simultaneously pushes the saw blade out of the clamping space automatically, avoiding the difficulty of manually removing the saw blade in the traditional solution and reducing the workload.

[0051] Another technical solution adopted in this application is to provide a reciprocating saw, including the saw blade quick clamp structure described above.

[0052] The reciprocating saw provided in this application, due to the configuration of the aforementioned saw blade quick-clamp structure, has the corresponding technical effects of the aforementioned saw blade quick-clamp structure. Attached Figure Description

[0053] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the saw blade quick-clamp structure when the outer ring of the chuck is in the second rotation position.

[0055] Figure 2 This is a schematic diagram of the saw blade quick-clamp structure when the outer ring of the chuck is in the first rotational position.

[0056] Figure 3 This is an exploded view of the saw blade quick-clamp structure of this application.

[0057] Figure 4 This is a schematic diagram of the assembly of the sheath and the slide bar body of this application.

[0058] Figure 5 for Figure 1 A schematic diagram of the transverse cross section.

[0059] Figure 6 for Figure 1 A schematic diagram of the longitudinal section.

[0060] Figure 7 for Figure 2 A schematic diagram of the transverse cross section.

[0061] Figure 8 for Figure 2 A schematic diagram of the longitudinal section.

[0062] Figure 9 This is a schematic diagram of the structure of the outer ring of the chuck in this application.

[0063] Figure 10 This is a cross-sectional schematic diagram of the outer ring of the chuck in this application.

[0064] Figure 11 This is a schematic diagram of the transverse cross-section of the saw blade quick-clamp structure of this application when the saw blade is initially inserted into the clamping opening.

[0065] Figure 12 This is a schematic diagram of the transverse cross-section of the saw blade quick-clamp structure of this application when the saw blade is fully inserted into the clamping opening.

[0066] Figure 13 This is a schematic diagram of the longitudinal section of the saw blade quick-clamp structure of this application when the saw blade is fully inserted into the clamping opening. Detailed Implementation

[0067] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0068] Reference Figures 1 to 4 A saw blade quick clamp structure 100 includes a chuck inner ring 10, a first positioning member 101 and a second positioning member 102 mounted on the chuck inner ring 10, a chuck outer ring 20 sleeved on the outside of the chuck inner ring 10, an elastic reset member 30 connected to the chuck outer ring 20, and a slide bar body 40 passing through the inner side of the chuck inner ring 10. One end of the slide bar body 40 is provided with a clamping opening 401, which extends along the length direction of the slide bar body 40. The surface of the slide bar body 40 is provided with a first mounting hole 402 and a second mounting hole 403 communicating with the clamping opening 401.

[0069] Reference Figures 5 to 8 One end of the first positioning member 101 passes through the first mounting hole 402 and extends into the clamping opening 401. One end of the second positioning member 102 passes through the second mounting hole 403 and extends into the clamping opening 401. After installation, the first positioning member 101 and the second positioning member 102 keep the inner ring 10 of the chuck and the slide bar body 40 mutually circumferentially limited. After installation, the inner ring 10 of the chuck will not rotate relative to the slide bar body 40.

[0070] It should be noted that, since the ends of the first positioning member 101 and the second positioning member 102 extend into the clamping opening 401 to clamp and fix the saw blade 200, when the tail ends of the first positioning member 101 and the second positioning member 102 are squeezed, their head ends may come together to form a clamping force. In this application, the inner wall of the rotating chuck outer ring 20 squeezes the tail ends of the first positioning member 101 and / or the second positioning member 102, thereby clamping and fixing the saw blade 400 that extends into the clamping opening 401.

[0071] Reference Figure 9 , Figure 10A protective sleeve 50 is installed on the slide rod body 40. A limiting rod 501 is passed through the protective sleeve 50. When the protective sleeve 50 is installed on the slide rod body 40, the protective sleeve 50 is sleeved from the end of the slide rod body 40. The limiting rod 501 passes through the clamping port 401. The protective sleeve 50 is slid until the limiting rod 501 slides to the end of the clamping port 401. The protective sleeve 50 is circumferentially limited on the slide rod body 40 through the cooperation between the limiting rod 501 and the clamping port 401. At least two elastic elements 60 are installed on the protective sleeve 50. One end of the elastic element 60 is connected to the locking element 70. The outer ring 20 of the chuck is provided with a locking groove 201 corresponding to the locking element 70.

[0072] In addition, the slide bar body 40 is provided with a through limiting groove 404, which extends in the length direction of the slide bar body 40. When the locking member 70 is installed, it passes through the limiting groove 404. The limiting groove is configured to allow the locking member 70 to move in the direction of approaching and moving away from the outer ring 20 of the chuck, while restricting the rotation of the locking member 70 in the circumferential direction.

[0073] In this embodiment, the elastic element 60 can be specifically implemented as a spring, the locking element 70 can be specifically implemented as a rod, and the locking groove 201 is two opposing U-shaped grooves provided on the outer ring 20 of the chuck. Under the elastic force of the elastic element 60, the locking element 70 will approach the outer ring 20 of the chuck. When its two ends match the locking groove 201, the locking element 70 limits the circumferential movement of the outer ring 20 of the chuck. When the locking element 70 is touched, causing the elastic element 60 to be squeezed, the locking element 70 separates from the locking groove 201 and moves away from the outer ring 20 of the chuck, and the circumferential limitation of the locking element 70 on the outer ring 20 of the chuck is released.

[0074] In this embodiment, the elastic reset member 30 can be a torsion spring. When the elastic reset member 30 is installed, it is sleeved on the outside of the slide bar body 40, with one end connected to the sheath 50 and the other end connected to the outer ring 20 of the chuck. When the outer ring 20 of the chuck rotates in one direction, the deformed elastic reset member 30 can drive the outer ring 20 of the chuck to rotate in the opposite direction and reset.

[0075] To achieve linkage control between the outer ring 20 of the chuck and the first positioning member 101 and the second positioning member 102, the inner wall surface of the outer ring 20 of the chuck is provided with a first arc-shaped groove 20a corresponding to the first positioning member 101 and a second arc-shaped groove 20b corresponding to the second positioning member 102. A clamping space is formed between the ends of the first positioning member 101 and the second positioning member 102. The end of the first positioning member 101 near the first arc-shaped groove 20a is designated as the tail end 101a, and the end away from the first arc-shaped groove 20a is designated as the head end 101b. The end of the second positioning member 102 near the second arc-shaped groove 20b is designated as the tail end 101a. The end of the saw blade 200 is the tail end 102a, and the end furthest from the second arc groove 20b is the head end 102b. When the saw blade 200 is installed, its end extends into the clamping opening 401 of the slide bar body 40. When the outer ring 20 of the chuck rotates, the inner wall of the first arc groove 20a will gradually press the tail end 101a of the first positioning member 101, and the inner wall of the second arc groove 20b will gradually press the tail end 102a of the second positioning member 102, thereby causing the first positioning member 101 and the second positioning member 102 to move relative to each other, and the head end 101b and the head end 102b will come together to form a clamping force on the saw blade 200.

[0076] Specifically, in this embodiment, the first positioning member 101 is implemented as a clamping pin, mainly serving to clamp and fix the saw blade 200. The head end 101b of the first positioning member 101 is truncated cone-shaped. The second positioning member 102 is implemented as a positioning pin, mainly serving to stably support the saw blade 200. When the chuck outer ring 20 rotates, the relative rotation trajectory between the first arc groove 20a and the first positioning member 101 is an Archimedean spiral. The second arc groove 20b is set as a common arc groove. Therefore, in this embodiment, the first positioning member 101 is in a movable installation state in the first mounting hole 402, while the installation state of the second positioning member 102 in the second mounting hole 403 is not limited. It can be installed either movably or fixedly. According to the design of the second arc groove 20b, in this embodiment, the second positioning member 102 is implemented as a positioning pin, which mainly plays the role of positioning and support when clamping the saw blade 200. The action of pressing and fixing the saw blade 200 is mainly accomplished by the first positioning member 101. Specifically, when the outer ring 20 of the chuck rotates, the inner wall of the first arc groove 20a will gradually squeeze the tail end 101a of the first positioning member 101, thereby causing the first positioning member 101 to move closer to the second positioning member 102. The inner wall of the second arc groove 20b will always support the tail end 102a of the second positioning member 102, so that the second positioning member 102 is in a stable support state.

[0077] Reference Figure 11 , Figure 12 , Figure 13After all the components of the saw blade quick clamp structure 100 are installed, the sheath 50 is fitted onto the slide bar body 40 and is circumferentially limited by the limiting rod 501. The inner ring 10 of the chuck is fitted onto the outside of the slide bar body 40. After the first positioning member 101 and the second positioning member 102 are inserted into place, the inner ring 10 of the chuck is also circumferentially limited onto the slide bar body 40. The outer ring 20 of the chuck is fitted onto the outside of the inner ring 10 of the chuck. An elastic reset member 30 is connected between the outer ring 20 of the chuck and the sheath 50. A locking member 70 is inserted into the limiting groove of the slide bar body 40.

[0078] When the saw blade 200 is disassembled or not installed, under the elastic force of the elastic element 60, the locking element 70 approaches the outer ring 20 of the chuck and extends into the locking groove 201 of the outer ring 20. Since the locking element 70 itself cannot rotate, the locked outer ring 20 also cannot rotate, and the outer ring 20 is in the second rotation position. It should be noted that in order to reach the second rotation position, the outer ring 20 needs an external force to drive it to rotate. When the outer ring 20 rotates to the second rotation position, the position of the locking groove 201 on it corresponds to the position of the locking element 70. The locking element 70 can smoothly engage with the locking groove 201 under the elastic force of the elastic element 60. After the outer ring 20 is circumferentially locked in the second rotation position, the elastic reset element 30 connected to it is in a deformation energy storage state. At this time, the inner wall of the first arc groove 20a and the first positioning element 1 There is a gap between the tail end 101a of 01, and the outer ring 20 of the chuck will not squeeze the first positioning member 101. That is to say, when the outer ring 20 of the chuck rotates to the second rotation position, there is no clamping force between the first positioning member 101 and the second positioning member 102. The first positioning member 101 is in a free-moving state in the first mounting hole 402. In this embodiment, when the saw blade 200 is disassembled or when the saw blade 200 is not installed, the outer ring 20 of the chuck is always in the second rotation position and the elastic reset member 30 is in a deformation energy storage state.

[0079] In some embodiments, a spring can be installed in the first mounting hole 402. The spring is sleeved on the outside of the first positioning member 101. When the outer ring 20 of the chuck rotates to the second rotation position, there is a gap between the inner wall of the first arc groove 20a and the tail end 101a of the first positioning member 101. The spring can keep the first positioning member 101 in a retracted state, so that a gap is formed between the head end 101b of the first positioning member 101 and the head end 102b of the second positioning member 102, so that there is no clamping force between the first positioning member 101 and the second positioning member 102.

[0080] When the saw blade 200 needs to be installed, one end of the saw blade 200 is inserted into the clamping port 401. Its end first contacts the head end 101b of the first positioning member 101. Since the circumferential surface of the head end 101b is conical, when the end of the saw blade 200 pushes the head end 101b of the first positioning member 101, the first positioning member 101 will retract within the first mounting hole 402. At this time, the end of the saw blade 200 will pass through the gap between the first positioning member 101 and the second positioning member 102, and further push the locking member 70. After being pushed by the saw blade 200, the locking member 70 will compress the elastic member 60 and move within the limiting groove 404. The moving locking member 70 separates from the locking groove 201 on the outer ring 20 of the chuck. At this time, the circumferential surface of the outer ring 20 of the chuck... When the limiting state is released, the elastic reset member 30, which is in the deformation and energy storage state, resets and drives the outer ring 20 of the chuck to rotate. During the rotation of the outer ring 20 of the chuck, the relative rotation trajectory of the first arc groove 20a and the first positioning member 101 is an Archimedean spiral. The first arc groove 20a on the inner wall of the outer ring 20 of the chuck will gradually approach the tail end 101a of the first positioning member 101 and gradually apply a squeezing force to the tail end 101a, so that the head end 101b of the first positioning member 10 approaches the head end 102b of the second positioning member 102. The first positioning member 101 and the second positioning member 102 form opposing clamping forces, thereby clamping and fixing the saw blade 200. At this time, the outer ring 20 of the chuck is in the first rotation position, and the saw blade 200 is installed. It should be noted that when the outer ring 20 of the chuck is in the first rotational position, the position of the locking groove 201 is offset from the position of the locking member 70. When the elastic member 60 is reset, the locking member 70 will be close to one side of the outer ring 20 of the chuck, but it cannot lock the outer ring 20 of the chuck. At this time, the outer ring 20 of the chuck is in a rotatable state (driven by external force).

[0081] After the saw blade 200 is installed, when it needs to be disassembled, the operator needs to rotate the outer ring 20 of the collet (from the first rotation position to the second rotation position). When the outer ring 20 of the collet reaches the second rotation position, the position of the locking groove 201 on it corresponds to the position of the locking member 70. Under the elastic force of the elastic member 60, the locking member 70 springs into the locking groove 201 and engages with it. After the locking member 70 springs into the locking groove 201, it can limit and lock the outer ring 20 of the collet, so that the outer ring 20 of the collet can be smoothly maintained in the second rotation position without the action of external force (at this time, the first positioning member). There is no clamping force between the first positioning member 101 and the second positioning member 102. At the same time, when the locking member 70 springs into the locking groove 201, the locking member 70 will apply a large and short-term ejection force to the end of the saw blade 200. The locking member 70, which quickly springs into the locking groove 201, will push the saw blade 200 out of the space between the first positioning member 101 and the second positioning member 102. That is to say, when the outer ring 20 of the chuck rotates to the second position, the locking member 70 will simultaneously push the saw blade 200 out of the clamping space automatically, avoiding the difficulty of manually removing the saw blade in the traditional solution and reducing the workload.

[0082] When installing the saw blade 200 of this application, a person can insert the saw blade 200 into the retaining port 401 with one hand to complete the installation. When the saw blade needs to be removed, a person can rotate the outer ring 20 of the chuck with one hand, and the saw blade 200 will automatically pop out. The person can then remove the saw blade 200 with one hand. This mechanism can realize the quick installation and removal of the saw blade 200 with one hand. Through the linkage design between the locking member 70 and the insertion of the saw blade, the insertion of the saw blade 200 automatically triggers clamping (the locking member 70 is triggered to release the outer ring 20 of the chuck, and the elastic reset member 30 is driven to reset). When removing, the saw blade 200 automatically pops out (the external force rotates the outer ring of the chuck 20 to the second position, the locking member pushes out the saw blade and locks the mechanism). No auxiliary tools or two-handed operation are required throughout the process.

[0083] Moreover, the quick-clamp structure 100 is self-locking and anti-reset when it is in the loose state. When the clamping force of the saw blade 200 is released, the locking member 70 locks the outer ring 20 of the chuck in the second rotation position under the action of the elastic force, ensuring that the mechanism stably maintains the loose state during the replacement of the saw blade 200, and completely solving the operational burden and accidental reset risk of the prior art that requires continuous force to maintain the loose state.

[0084] Example 2

[0085] Based on the same technical concept, this application provides a reciprocating saw, which includes a motor, a transmission device connected to the motor, and a saw blade quick clamping structure 100 as described in the above embodiment. The motor drives the slide bar body 40 of the saw blade quick clamping structure 100 to perform linear reciprocating motion through the transmission device.

[0086] In the preferred implementation, the reciprocating saw is a DC electric reciprocating saw.

[0087] After installing the saw blade quick-clamp structure 100 on the reciprocating saw, the saw blade can be quickly disassembled and assembled with one hand. The quick-clamp structure is self-locking and prevents reset when it is released.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A saw blade quick-clamp structure, comprising: Chuck inner ring; The first positioning element and the second positioning element are respectively installed on the inner ring of the chuck; The outer ring of the chuck is fitted around the outer side of the inner ring of the chuck and is connected to an elastic reset member; The outer ring of the chuck is configured as follows: When the outer ring of the chuck is in the first rotational position relative to the inner ring of the chuck, its inner wall surface can press the first positioning member and / or the second positioning member, so that a clamping force is formed between the first positioning member and the second positioning member to clamp and fix the saw blade body. When the outer ring of the chuck is in the second rotational position relative to the inner ring of the chuck, the squeezing force of its inner wall against the first positioning member and / or the second positioning member disappears, and the clamping force of the first positioning member and the second positioning member on the saw blade body is released. The power required for the outer ring of the chuck to change from the second rotational position to the first rotational position is provided by the deformed elastic reset member; The feature is that it further includes a locking member that is circumferentially limited, which can approach the outer ring of the chuck under the action of elastic force, so that the outer ring of the chuck is circumferentially locked and held in the second rotational position, and the elastic reset member is in an energy storage state. When the saw blade body is inserted into the inner ring of the chuck, it is adapted to actuate the locking member to separate the locking member from the outer ring of the chuck. The elastic reset member drives the outer ring of the chuck to rotate to the first rotation position, and the first positioning member and the second positioning member clamp and fix the saw blade body.

2. The quick clamping structure of saw blade according to claim 1, characterized in that, When the outer ring of the chuck changes from the first rotation position to the second rotation position under the drive of external force, the clamping force of the first positioning member and the second positioning member on the saw blade body is released, and the locking member pushes the saw blade body out of the clamping space between the first positioning member and the second positioning member under the action of elastic force, and locks the outer ring of the chuck in the second rotation position.

3. The fast clamping structure of saw blade according to claim 1, characterized in that, It also includes a slide bar body, the inner ring of the chuck is sleeved on the outside of the slide bar body, one end of the slide bar body is provided with a clamping opening, and the surface of the slide bar body is provided with a first mounting hole and a second mounting hole communicating with the clamping opening; One end of the first positioning member passes through the first mounting hole and extends into the clamping opening, and one end of the second positioning member passes through the second mounting hole and extends into the clamping opening. After installation, the first positioning member and the second positioning member keep the inner ring of the chuck and the slide bar body mutually circumferentially limited. When the saw blade body is installed, one end of it extends into the clamping opening and is clamped and fixed by the first positioning member and the second positioning member.

4. The fast clamping structure of saw blade according to claim 1, characterized in that, At least one arc-shaped groove corresponding to the first positioning member is provided on the inner wall surface of the outer ring of the chuck. When the outer ring of the chuck changes from the second rotation position to the first rotation position, the arc-shaped groove rotates relative to the first positioning member, and its wall surface gradually squeezes the first positioning member, so that the end of the first positioning member approaches the second positioning member, thereby forming the clamping force.

5. The quick clamping structure of saw blade according to claim 4, wherein, The relative rotational trajectory between the arc-shaped groove and the first positioning element is an Archimedean spiral.

6. The fast clamping structure of saw blade according to claim 3, wherein, A protective sleeve is installed on the slide bar body, and an elastic element is installed on the protective sleeve. One end of the elastic element is connected to the locking element, and a locking groove corresponding to the locking element is provided on the outer ring of the clamp. The locking element is configured as follows: When the saw blade body is inserted into the clamping port, it touches the locking member, causing the locking member to separate from the locking groove. The elastic reset member drives the outer ring of the chuck to switch to the first rotation position. The locking groove is misaligned with the locking member. The first positioning member and the second positioning member clamp and fix the saw blade body. When the outer ring of the chuck changes from the first rotational position to the second rotational position under the drive of external force, the locking groove corresponds to the locking member, the clamping force of the first positioning member and the second positioning member on the saw blade body is released, and the locking member pushes the saw blade body out from the clamping space between the first positioning member and the second positioning member under the elastic force of the elastic member. The locking member extends into the locking groove and matches the locking groove, locking the outer ring of the chuck in the second rotational position.

7. The saw blade quick clamp structure according to claim 6, wherein The elastic reset element is a torsion spring, one end of which is connected to the sheath and the other end is connected to the outer ring of the clamp.

8. The fast clamping structure of saw blade according to claim 6, characterized in that, A limiting rod is provided on the sheath, and the limiting rod passes through the clamping opening. The sheath is circumferentially limited on the slide bar body by the cooperation of the limiting rod and the clamping opening.

9. The fast clamping structure of saw blade according to claim 1, wherein, The end of the first positioning member closest to the second positioning member is a tapered end.

10. The fast clamping structure of saw blade according to claim 3, wherein, The slide bar body is provided with a through-hole limiting groove, and the locking member passes through the limiting groove. The limiting groove is configured to allow the locking member to move in the direction of approaching and moving away from the outer ring of the chuck, while restricting the rotation of the locking member in the circumferential direction.

11. A saw blade quick-clamp structure, comprising: Chuck inner ring; The outer ring of the chuck has a locking groove on its circumference and is fitted onto the outside of the inner ring of the chuck, and is connected to an elastic reset member. The slide bar body is provided with a clamping opening for holding the saw blade and a through limiting groove; A locking element, which passes through the limiting groove; An elastic element connects to the locking element and applies an elastic force toward the outer ring of the collet; Its features are: When the saw blade is not installed, the locking member maintains a limited fit with the locking groove under the action of elastic force, the outer ring of the chuck is locked in the second rotation position, and the elastic reset member is in an energy storage state. When the saw blade is inserted into the clamping port, the end of the saw blade pushes the locking member to compress the elastic member and disengage from the locking groove, releasing the locking of the outer ring of the chuck. Under the reset action of the elastic reset member, the outer ring of the chuck automatically rotates to the first rotation position to squeeze the positioning member to clamp the saw blade. When an external force drives the outer ring of the chuck to rotate from the first rotation position to the second rotation position, the locking groove aligns with the locking member, and the elastic member drives the locking member to move and spring into the locking groove, so that the locking member pushes the saw blade, ejects the saw blade from the clamping opening, and locks the outer ring of the chuck in the second rotation position.

12. The saw blade quick clamp structure according to claim 11, wherein The limiting groove is configured as follows: The locking element is allowed to move axially along the slide bar body; The locking element is prohibited from rotating circumferentially.

13. The saw blade quick clamp structure according to claim 11, wherein When the outer ring of the chuck rotates to the second rotation position, the central axis of the locking groove is parallel to or coincides with the locking member; When the outer ring of the chuck rotates to the first rotation position, the axis of the locking groove is misaligned with the locking member, and the outer ring of the chuck is pressed against the positioning member by the arc-shaped groove arranged on its inner wall surface.

14. A reciprocating saw characterized by, The saw blade quick clamp structure includes any one of claims 1-13.

Images