A reciprocating cutting tool

Abstract

This invention discloses a reciprocating cutting tool, including a base, a battery pack, a guide connection structure, and a linkage shielding mechanism. The base is provided with electrical contacts, the battery pack is detachably connected to the base, the guide connection structure is located between the two to guide installation, and the linkage shielding mechanism includes an action input component, a mechanical locking component, and a shielding component. In the initial installation state of the battery pack, the shielding component is in the shielded position, physically isolating the electrical contacts. When the action input component is operated, it is linked with the mechanical locking component and the shielding component. First, the mechanical locking component is driven to completely mechanically lock the battery pack to the base, and then the shielding component is driven to move to the open position to expose the electrical contacts and establish an electrical connection. The purpose of this application is to provide a reciprocating cutting tool with precise guided installation and a sequential linkage mechanism, thereby reducing component wear, improving connection reliability, and avoiding safety risks caused by a partial connection state.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically, to a reciprocating cutting tool. Background Technology

[0002] In practical applications of reciprocating cutting tools, the detachable connection structure between the battery pack and the base directly affects the overall safety and operational stability of the tool. Currently, the commonly used connection method relies on a combination of a base groove and elastic clips. When the battery pack is inserted into the base, the electrical contacts immediately engage, forming a power circuit. This design has significant shortcomings: Firstly, due to the lack of a dedicated guiding connection structure, the battery pack lacks precise positioning guidance during installation. Operators are prone to tilting or misaligning the battery pack due to centering deviations, causing repeated scratching and wear on the guide surface and bosses, and potentially damaging the electrical contact surface, significantly reducing connection reliability over long-term use. Secondly, the energizing process and the mechanical locking action are independent of each other, lacking an effective sequential linkage mechanism. This allows the electrical contacts to engage prematurely before the battery pack reaches a fully mechanically locked state, creating a dangerous semi-connection. When tools are subjected to high-frequency vibration, such unstable connections are prone to accidental loosening of the battery pack or momentary disconnection of electrical contacts due to vibration and impact, which can lead to phenomena such as arc discharge and circuit interruption. This not only frequently interrupts the normal operation process, but may also induce safety accidents such as electric shock and short circuit, posing a potential threat to operators. Summary of the Invention

[0003] The purpose of this application is to provide a reciprocating cutting tool with a precise guided installation and sequential linkage mechanism, thereby reducing component wear, improving connection reliability, and avoiding safety risks caused by a semi-connected state.

[0004] To address the aforementioned problems, this invention provides a reciprocating cutting tool, comprising: a base, a battery pack, a guide connection structure, and a linkage shielding mechanism; the base is provided with electrical contacts; the battery pack is detachably connected to the base; the guide connection structure is disposed between the base and the battery pack for guiding the battery pack installation; the linkage shielding mechanism includes an action input component, a mechanical locking component, and a shielding component; wherein, in the initial state of the battery pack being installed on the base along the guide connection structure, the shielding component is in a shielded position to physically isolate the effective contact area of ​​the electrical contacts; the action input component is driven to connect with the mechanical locking component and is linked with the shielding component, such that when the action input component is operated, the mechanical locking component is first driven to achieve a fully mechanically locked state between the battery pack and the base, and then the shielding component is driven to move from the shielded position to the open position, thereby exposing the electrical contacts to establish an electrical connection.

[0005] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: This invention uses a guide connection structure to directionally guide the battery pack installation, solving the problems of inaccurate installation positioning and easy misalignment / scratching of parts caused by the lack of effective guidance in existing structures. It eliminates the need for precise manual alignment, making assembly more convenient and efficient. Utilizing the "mechanical locking first, then electrical connection" logic of the linkage shielding mechanism, the electrical contacts in the initial state are physically isolated, and power is only applied after the battery pack is fully locked, avoiding the risk of "power on before complete locking" in existing technologies and improving safety. The mechanical locking component achieves complete mechanical locking between the battery pack and the base, eliminating connection gaps. Compared to the single fixing method of existing elastic buckles, it can resist vibrations during tool operation, effectively preventing the battery pack from loosening or the electrical contacts from detaching, ensuring continuous and reliable operation.

[0006] Furthermore, before the shielding component leaves the shielding position, the mechanical locking assembly has already completed the action of achieving a fully mechanically locked state between the battery pack and the base.

[0007] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: It clearly defines the absolute sequential boundary between locking and energizing, completely eliminating the critical risk of "the shielding component starting to move before locking is complete." Compared to the ambiguous logic of existing technologies where the linkage process is synchronized and energizing occurs before locking is complete, this solution achieves a rigid logical closed loop from locking to energizing by limiting "the shielding component to leave its shielding position only after the mechanical locking component has fully completed its locking action," without any intermediate transition state. Even in extreme scenarios such as high-frequency vibration of the cutting tool or minor assembly deviations, it ensures that the battery pack and base are fully locked before establishing an electrical connection, fundamentally avoiding problems such as battery pack loosening or instantaneous battery disconnection due to insecure locking, further improving connection reliability and usage safety.

[0008] Furthermore, the shielding element is rotatably disposed in the effective contact area of ​​the electrical contact; the linkage shielding mechanism is provided with an elastic reset element, which acts on the shielding element, forcing the shielding element to have a rotational tendency to return from the open position to the shielded position.

[0009] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the shielding component is rotatably set in the effective contact area of ​​the electrical contact, and an elastic reset component is provided for the linkage shielding mechanism. The elastic reset component acts on the shielding component, forcing the shielding component to have a rotational tendency to return from the open position to the shielded position, thereby effectively solving the safety risk that the lack of an automatic reset mechanism after the shielding component moves may lead to the exposure of the electrical contact.

[0010] Furthermore, the mechanical locking assembly includes: an eccentric wheel mechanism; the eccentric wheel mechanism includes an eccentric cam fixedly connected to the motion input component, and a locking block slidably disposed within the base; rotating the motion input component radially pushes the locking block through the eccentric cam to apply radial rigid pressure to the battery pack and eliminate connection gaps.

[0011] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: Existing technologies commonly use elastic snap-fit ​​or friction locking structures, whose locking force relies on the deformation of elastic elements or the static friction of mating surfaces. Under the continuous vibration generated by high-frequency reciprocating operation of tools, creep, loosening, or instantaneous disengagement can easily occur, leading to fretting wear and connection gaps between the battery pack and the base, potentially causing power outages in severe cases. This solution uses an eccentric wheel mechanism to achieve rigid locking. The eccentric cam rotates to drive the locking block radially to tighten the battery pack. This structure has self-locking characteristics, and the locking force is stable and adjustable, independent of elastic deformation, completely eliminating assembly gaps and forming a robust rigid connection. Even under strong vibration conditions, this mechanism maintains a stable locking state, greatly improving the vibration resistance and reliability of the battery pack connection. It effectively avoids safety hazards such as electrical connection interruptions and arcing caused by vibration-induced loosening. Furthermore, its simple structure and labor-saving operation improve assembly efficiency and service life.

[0012] Furthermore, the linkage shielding mechanism also includes a sensor and an electric drive component; the sensor is installed on the inner wall of the base to detect whether the locking block has reached the fully locked position; the electric drive component is connected to the rotating shaft of the shielding component.

[0013] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: The mechanical locking and circuit connection systems operate independently, allowing users to subjectively judge whether the lock is engaged based solely on touch or sound, lacking objective and precise status feedback. Furthermore, purely mechanical linkage mechanisms are prone to asynchrony due to wear after long-term use. This solution introduces an electronically controlled linkage unit composed of sensors and electric drive components. The sensors can detect the physical position of the locking block in real time and accurately, converting the mechanical state of "fully locked" into a identifiable electrical signal. The electric drive components then drive the shielding component based on this signal. This design achieves closed-loop, objective, and high-precision control from "mechanical locking state" to "circuit connection permission," completely eliminating the risk of premature activation due to human subjective misjudgment or mechanical wear. Simultaneously, the electric drive components (such as micro servos) move smoothly and with precise positioning, avoiding mechanical jamming and improving system reliability and lifespan. This electromechanical linkage provides an intelligent and highly reliable solution for tool connection safety.

[0014] Furthermore, after receiving the positioning signal from the sensor, the electric drive unit drives the shielding component to rotate around the rotation axis, from the shielding position that blocks the effective contact area to the open position that lies flat, so as to expose the effective contact area of ​​the electrical contact.

[0015] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: The driving action of the shielding component is strictly bound to the positioning signal emitted by the sensor, ensuring that the electric drive component can only drive the shielding component to rotate from the shielded position to the open position after the battery pack and base have reached a fully mechanically locked state. This mechanism fundamentally avoids the risk of premature exposure of electrical contacts before mechanical locking is complete, eliminates the dangerous semi-connected state, and significantly improves operational safety. The use of an electric drive component makes the flipping action of the shielding component more precise, smooth, and controllable. The design around the rotation axis ensures the clarity of the movement trajectory, effectively avoiding jamming or incomplete action. The shielding component rotating to the "flat" open position not only ensures the complete exposure of the effective contact area of ​​the electrical contacts, creating conditions for establishing a reliable electrical connection, but also minimizes the space occupied by the shielding component in the open state, avoiding interference with the insertion or removal of the battery pack and optimizing structural compactness. This solution, in conjunction with the aforementioned sensors and electric drive components, ensures the mechanical stability and electrical safety of the battery pack connection, effectively preventing safety accidents such as arcing and short circuits caused by incomplete connections, and guaranteeing the safety of operators and the stable operation of equipment.

[0016] Furthermore, the shielding components are equipped with different visual markings, corresponding to the shielded and open positions respectively.

[0017] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: In existing technologies, users need to manually check the battery pack installation or try to start the tool to determine whether the power is locked, which is cumbersome and prone to misjudgment; This solution directly corresponds to the covered position (power off, unlocked) and the open position (power on, locked) with different visual signs, so users do not need to do anything extra and can clearly understand the current status at a glance, which greatly improves the convenience of operation.

[0018] Furthermore, the guide connection structure includes a guide surface and a boss; the guide surface is formed at the open end of the base, and the distance between the guide surfaces gradually decreases inward along the open end; the boss is disposed on the battery pack and matches the guide surface, and is used for automatic alignment when the battery pack is inserted into the base.

[0019] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: Existing technologies rely on the cooperation of sliding grooves and elastic buckles, requiring manual alignment before insertion, which can easily lead to misalignment and jamming due to alignment deviations. This solution, through the design of guide surfaces with gradually decreasing spacing and matching bosses, allows the bosses to slide naturally along the guide surfaces when the battery pack is inserted. The gradual constraint of the guide surfaces automatically corrects deviations, eliminating the need for precise manual alignment and achieving coaxial alignment between the battery pack and the base, thus significantly improving positioning accuracy.

[0020] Furthermore, the guide surface and / or boss are provided with an anti-misinsertion structure.

[0021] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: In the case of misinsertion, the battery pack contacts and connecting surfaces are prone to hard collisions and scratches with the inner wall of the base; This solution intercepts the misinsertion action in advance through the anti-misinsertion structure, avoiding contact between the battery pack and the key mating surfaces and contacts of the base, fundamentally protecting the components from damage and extending their service life.

[0022] Furthermore, all components of the linkage shielding mechanism are integrated onto the base.

[0023] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: In existing technologies, the components of the linkage shielding mechanism are often scattered between the base and the battery pack, which means that the battery pack needs to be adapted to a specific linkage structure to be universal, and incompatibility problems are prone to occur when replacing the battery pack; This solution integrates all linkage components into the base, and the battery pack does not need to be designed with any linkage adaptation structure. It only needs to meet the basic installation and conductivity requirements to be universal, which greatly improves the interchangeability of battery packs of different specifications and batches and reduces the cost of replacing battery packs for users.

[0024] In summary, the above-mentioned technical solutions of this application can have one or more of the following advantages or beneficial effects: i) Constructing an integrated linkage system of "guidance, locking, and power-on", achieving automatic centering of the battery pack during blind installation through a gradient guide surface and matching boss, applying a gapless locking force in conjunction with a rigid transmission component (eccentric wheel mechanism), and simultaneously triggering the linkage of the shielding component through electronic detection, strictly ensuring the rigid logic of "power-on after complete locking", completely eliminating the hidden dangers of partial connection in the prior art, and enhancing operational safety through anti-misinsertion structure and visual markings, enabling it to meet the stable use requirements in high-frequency vibration operation scenarios; ii) The structural design takes into account both convenience and compatibility, with a rotating shielding component. The system features an elastic reset component for automatic power failure protection, an eccentric wheel mechanism for easy and efficient locking, and integrated linkage components in the base to simplify the battery pack structure and improve the interchangeability of various battery pack specifications. All functional modules are compactly integrated without taking up extra space, reducing production and assembly costs and facilitating future maintenance and repair. iii) Durability and adaptability are significantly improved. The rigid locking structure replaces the traditional elastic buckle, avoiding locking failure caused by elastic fatigue. The electric drive linkage solution can be adapted to multiple models through parameter adjustment. Sensors and anti-interference logic ensure stable operation in extreme environments while reducing component scratch damage and extending the service life of the battery pack and base connection structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a reciprocating cutting tool according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the base structure of the reciprocating cutting tool in an embodiment of the present invention;

[0027] Figure 3 This is a structural diagram of the base from other perspectives in an embodiment of the present invention;

[0028] Figure 4 for Figure 3 A sectional view along the middle AA;

[0029] Figure 5 for Figure 2 A magnified view of a section at point B in the middle;

[0030] Figure 6 This is a schematic diagram of the battery pack structure of the reciprocating cutting tool in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the base mounting the sunken storage cavity in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the shielding component and the sunken storage cavity in an embodiment of the present invention;

[0033] Figure 9 for Figure 8 A cross-sectional view along the middle BB.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Base; 11-Electrical contact; 12-Slide groove; 2-Battery pack; 21-Electrical connection; 31-Guide surface; 32-Boss; 33-Open end; 41-Action input component; 42-Mechanical locking assembly; 421-Eccentric wheel mechanism; 422-Locking block; 43-Shielding component; 44-Sensor; 45-Electrical drive component; 46-Storage cavity; 47-Vertical track; 5-Reciprocating cutting tool. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Traditional reciprocating cutting tools 5 typically use a combination of a basic sliding groove 12 and an elastic buckle when connecting the battery pack 2 to the base 1, lacking a dedicated guiding connection structure. This leads to misalignment during the installation of the battery pack 2, causing wear on components and damage to the electrical contacts 11. Furthermore, the energizing process and the mechanical locking action are independent of each other. The electrical contacts 11 may prematurely engage before the battery pack 2 reaches a fully mechanically locked state, resulting in an unstable semi-connection. Under high-frequency vibration operations, this can easily cause safety accidents such as battery pack 2 detachment, arc discharge, and circuit interruption, posing a potential threat to operators.

[0038] If the above problems are not resolved, the battery pack 2 may completely detach from the base 1 during operation, causing the electrical contact 11 to disconnect instantly. This will not only interrupt the cutting process but may also cause safety hazards due to arc discharge. At the same time, the repeated scraping of the electrical contact 11 in the semi-connected state will accelerate component wear and reduce the overall safety performance and service life of the tool.

[0039] For this, see Figures 1 to 9As shown, the present invention provides a reciprocating cutting tool 5, comprising: a base 1, a battery pack 2, a guide connection structure, and a linkage shielding mechanism; the base 1 is provided with electrical contacts 11; the battery pack 2 is detachably connected to the base 1; the guide connection structure is disposed between the base 1 and the battery pack 2 for guiding the installation of the battery pack 2; the linkage shielding mechanism includes an action input component 41, a mechanical locking component 42, and a shielding component 43; wherein, in the initial state of the battery pack 2 being installed on the base 1 along the guide connection structure, the shielding component 43 is in a shielded position to physically isolate the effective contact area of ​​the electrical contacts 11; the action input component 41 is driven to connect with the mechanical locking component 42 and is linked with the shielding component 43, such that when the action input component 41 is operated, the mechanical locking component 42 is first driven to achieve a fully mechanically locked state between the battery pack 2 and the base 1, and then the shielding component 43 is driven to move from the shielded position to the open position, thereby exposing the electrical contacts 11 to establish an electrical connection.

[0040] The guide connection structure refers to the structure disposed between the base 1 and the battery pack 2, used to provide physical guidance and positioning during the installation of the battery pack 2. This structure ensures that the battery pack 2 can be accurately and smoothly inserted into the base 1. The battery pack 2 is provided with an electrical connection part 21 that matches the electrical contacts 11. After the battery pack 2 is installed into the base 1, the mechanical locking assembly 42 is driven to achieve a fully mechanically locked state between the battery pack 2 and the base 1, and the shield 43 between the electrical connection part 21 and the electrical contacts 11 is moved to the open position, and the reciprocating cutting tool 5 is energized.

[0041] The linkage shielding mechanism refers to an integrated mechanical or electromechanical mechanism that includes an action input 41, a mechanical locking component 42, and a shielding component 43, used to coordinate the two processes of mechanical locking of the battery pack 2 and exposure of the electrical contacts 11, ensuring that the two are executed in a preset sequence.

[0042] The action input component 41 refers to the component in the linkage shielding mechanism that is operated by the user. The action of this component is used to activate the mechanical locking and the movement of the shielding component 43.

[0043] Mechanical locking component 42 refers to the component in the linkage shielding mechanism responsible for physically fixing the battery pack 2 and the base 1 to achieve a stable connection.

[0044] The shielding member 43 refers to the component in the linkage shielding mechanism used to physically block the effective contact area of ​​the electrical contact 11 to prevent accidental contact of the electrical contact 11 when not in operation. The shielding position refers to the state or position in which the shielding member 43 is in the position of blocking the effective contact area of ​​the electrical contact 11. The open position refers to the state or position in which the shielding member 43 is moved from the shielding position, exposing the effective contact area of ​​the electrical contact 11 in order to establish an electrical connection.

[0045] The effective contact area refers to the specific surface or area on the electrical contact 11 that is actually used to establish an electrical connection.

[0046] Specifically, the overall structure of the reciprocating cutting tool 5 includes four core parts: base 1, battery pack 2, guide connection structure, and linkage shielding mechanism. Base 1 is an integrated load-bearing housing with pre-set mounting slots inside for fixing electrical contacts 11 and all components of the linkage shielding mechanism; battery pack 2 is an independent power supply unit, which is detachably plugged into base 1 through guide connection structure. It is only configured with basic structure for installation and does not integrate any linkage function components.

[0047] Furthermore, a guide connection structure is positioned between the open end 33 of the base 1 and the insertion end of the battery pack 2 to guide the precise assembly of the battery pack 2. The linkage shielding mechanism includes an action input component 41, a mechanical locking component 42, and a shielding component 43, which work together to achieve the core logic of "locking before powering on". When the battery pack 2 is inserted into the base 1 along the guide connection structure to the initial assembly position, the shielding component 43 is in a preset shielding position, and its structure completely covers the effective contact area of ​​the electrical contact 11, forming a physical barrier and preventing the establishment of an electrical connection. When the action input component 41 is operated, it first drives the mechanical locking component 42 to fix the battery pack 2 and the base 1 in a completely mechanically locked state without gaps, and then drives the shielding component 43 to move to the open position through the linkage structure, exposing the effective contact area of ​​the electrical contact 11, so that the battery pack 2 and the base 1 can establish a stable electrical connection.

[0048] In one example of this application, the mechanical locking assembly 42 has completed the action of fully mechanically locking the battery pack 2 and the base 1 before the shielding member 43 leaves the shielding position.

[0049] Specifically, to ensure the rigidity of the "lock first, then power on" logic, the action sequence is limited through structural design: the locking stroke of the mechanical locking component 42 and the driving stroke of the shielding component 43 are independent of each other, and a trigger association threshold is set. When the operation input component 41 drives the mechanical locking component 42, the locking block 422 must be fully pressed against the side wall of the battery pack 2 to eliminate all assembly gaps and achieve a fully mechanically locked state before the sensor 44 will send a positioning signal. The electric drive component 45 will only drive the shielding component 43 to leave the shielding position after receiving this positioning signal. This dual protection from both structural and control logic ensures that the movement of the shielding component 43 always begins after the mechanical locking is completed.

[0050] In one example of this application, the shielding member 43 is rotatably disposed in the effective contact area of ​​the electrical contact 11; the linkage shielding mechanism is provided with an elastic reset member, which acts on the shielding member 43, forcing the shielding member 43 to have a rotational tendency to return from the open position to the shielded position.

[0051] Specifically, the shielding component 43 adopts a fan-shaped insulating baffle structure adapted to the layout of the electrical contacts 11. Its size precisely matches the contour of the effective contact area of ​​the electrical contacts 11, ensuring complete coverage when shielded and no obstruction of the conductive path when open. At the center of the area of ​​the electrical contacts 11 inside the base 1, a horizontally extending metal rotating shaft is fixed. The fan-shaped shielding component 43 is assembled with the rotating shaft through a bushing, and can rotate freely around the shaft by 90º. The two ends of the rotating shaft are positioned with the inner wall of the base 1 through bearings, ensuring smooth rotation without jamming.

[0052] The linkage shielding mechanism is equipped with a torsion spring as an elastic reset component. The torsion spring is sleeved in the middle of the rotating shaft. One end of the torsion spring is fixed to the side wall lug of the shielding component 43 by a hook, and the other end is embedded in the limiting groove of the inner wall of the base 1. The torsion spring is in a pre-tightened state when the shielding component 43 is in the open position, and always applies a reverse torsional force to the shielding component 43, forcing the shielding component 43 to have a rotational tendency to reset from the flat open position to the upright shielding position, ensuring that the shielding component 43 can automatically return to its original position and disconnect the electrical contact 11 after unlocking.

[0053] In another instance of this application, see [link to application]. Figures 7 to 9 As shown, the shielding member 43 adopts a recessed design to avoid spatial interference with the battery pack 2, which is in a fully locked state.

[0054] Specifically, the shielding member 43 is an insulating baffle that matches the shape of the effective contact area of ​​the electrical contact 11. The insulating baffle has a certain degree of plasticity. The shielding member 43 is initially in the shielding position, shielding a portion of the area of ​​the electrical contact 11. The electric drive member 45 is a miniature linear motor or a servo motor with a rack and pinion transmission mechanism. Its output end is connected to the shielding member 43 to drive it to slide along the vertical track 47 perpendicular to the insertion direction of the battery pack 2.

[0055] Inside the base 1, a horizontal storage cavity is provided directly below the front end of the electrical contact 11. When the sensor 44 detects that the locking block 422 has reached the fully locked position and sends a signal, the control unit controls the electric drive 45 to start, driving the shielding member 43 to slide downwards along the vertical track 47, eventually retracting completely into the storage cavity, thus reaching the open position and fully exposing the electrical contact 11. At this time, there is a safety gap between the bottom of the battery pack 2 and the top of the shielding member 43 in the storage cavity, ensuring no contact. When it is necessary to remove the battery pack, the electric drive moves in the opposite direction, lifting the shielding member 43 from the storage cavity and resetting it to the shielded position.

[0056] This recessed design orthogonally decouples the movement path (vertically downward) of the shielding component 43 from the installation space (horizontal insertion) of the battery pack 2 in three-dimensional space, ensuring that the movement of the shielding component 43 will not physically interfere with the battery pack 2, whether it is in the middle of installation or in the final locked state. This reliably realizes the core logic of "first fully mechanically locking, then moving the shielding component to establish an electrical connection".

[0057] In one example of this application, the mechanical locking assembly 42 includes: an eccentric wheel mechanism 421; the eccentric wheel mechanism 421 includes an eccentric cam fixedly connected to the motion input member 41, and a locking block 422 slidably disposed in the base 1; rotating the motion input member 41, the eccentric cam radially pushes the locking block 422 to apply radial rigid pressure to the battery pack 2 and eliminate the connection gap.

[0058] Specifically, the mechanical locking assembly 42 in this embodiment employs an eccentric wheel mechanism. The eccentric cam of this mechanism is fixedly connected to the shaft of the actuation input component 41 (e.g., a knob) via a key or pin, ensuring synchronous rotation and seamless power transmission. The locking block 422 is a rectangular metal block whose bottom is embedded in a linear groove 12 formed in the inner wall of the base 1. The groove 12 extends parallel to the insertion direction of the battery pack 2, allowing the locking block 422 to slide only radially.

[0059] When the user rotates the motion input 41, the eccentric cam rotates accordingly. Due to the eccentric design, the distance of the cam's outer profile relative to the center of the axis of rotation (i.e., the radius of rotation) constantly changes. During the drive stroke, the "telecentric section" of the cam gradually contacts the contact surface of the locking block 422 and applies a thrust, driving the locking block 422 to move smoothly along the slide groove 12 toward the side wall of the battery pack 2. When the motion input 41 rotates to the end of its stroke (e.g., rotates 90°), the eccentric cam is at its maximum eccentric position. At this time, the locking block 422 is pushed to its farthest end, and the anti-slip teeth (or contact surface) at its end generate a tight and continuous rigid clamping force with the side wall of the battery pack 2.

[0060] This radial rigid pressure acts directly on the main mating surfaces of the battery pack 2 and the base 1, effectively eliminating microscopic assembly gaps caused by manufacturing tolerances or wear, ensuring a stable and wobbly connection of the battery pack 2 within the base 1. The locking force is determined by the mechanical characteristics (eccentricity, friction angle) of the eccentric wheel mechanism, possessing self-locking properties and maintaining its position without continuous external force. Therefore, even under the high-frequency vibration conditions of reciprocating cutting tools, it reliably prevents the battery pack 2 from loosening or shifting, ensuring the long-term stability of the electrical connection and mechanical structure.

[0061] In one embodiment of this application, the linkage shielding mechanism further includes a sensor 44 and an electric drive component 45; the sensor 44 is mounted on the inner wall of the base 1 and is used to detect whether the locking block 422 has reached the fully locked position; the electric drive component 45 is connected to the rotation shaft of the shielding component 43.

[0062] The linkage shielding mechanism also includes a control unit and a backup power supply. The control unit is located inside the base 1 and is electrically connected to the sensor 44, the electric drive unit 45, and the backup power supply. The backup power supply (e.g., a rechargeable button battery or supercapacitor) is independent of the battery pack 2 and is used to provide operating power to the control unit, sensor 44, and electric drive unit 45 when the battery pack 2 is not electrically connected. The control unit is configured to, upon receiving a position signal from the sensor 44, control the backup power supply to power the electric drive unit 45 and drive its operation.

[0063] Specifically, the electronically controlled linkage system consists of a sensor 44, an electric drive component 45, a control unit, and a backup power supply. The sensor 44 is preferably a high-precision microswitch or a Hall sensor, which is fastened to a pre-set mounting base on the inner wall of the base 1 by screws, and its trigger head is precisely aligned with the end position of the sliding stroke of the locking block 422. When the locking block 422 reaches the fully locked position under the drive of the eccentric cam, its end will press down the trigger head of the microswitch or trigger the magnetic induction threshold of the Hall sensor, thereby generating a clear "in position" electrical signal.

[0064] The control unit, serving as the core of the system's logic processing, can be an embedded microcontroller (MCU) or a set of custom relay logic circuits, and is packaged and fixed within the vibration-damping area inside the base 1. This control unit has at least three electrical interfaces: a signal input interface connected to the sensor 44 via a wire; a power interface connected to the backup power supply; and a drive output interface connected to the electric drive unit 45 via a wire.

[0065] The backup power source is an independent energy source for the electronic control system before the battery pack 2 is connected, such as a rechargeable lithium polymer button battery with a rated voltage of 3.7V. It is mounted in the base 1 by a bracket and is always connected to the power interface of the control unit to ensure that the control unit and sensor 44 are in a continuous standby state.

[0066] The electric drive unit 45 is a miniature servo motor, which is securely mounted on the inner wall of the base 1 via a metal bracket. The output of the servo motor is coaxially and fixedly connected to the rotating shaft of the shield 43 through a miniature coupling, ensuring that the rotational power can be transmitted accurately and without error.

[0067] The system works as follows: When the user rotates the input device 41 to complete the mechanical locking, the locking block 422 triggers the sensor 44, and the position signal generated by the sensor 44 is sent to the control unit. The logic circuit or program in the control unit responds immediately, and its drive output interface closes, directing the power from the backup power supply to the micro servo motor (electric drive device 45). The servo motor then begins to rotate, driving the rotation shaft of the shielding device 43 through the coupling, causing it to smoothly rotate approximately 90° from the vertical shielding position to the horizontal open position, thus fully exposing the effective contact area of ​​the electrical contact 11 and establishing a power supply path for the battery pack 2. This process achieves automatic, reliable, and verifiable linkage from the mechanically locked state to the circuit-connected state.

[0068] In one example of this application, after receiving the position signal from the sensor 44, the electric drive 45 drives the shielding member 43 to rotate around the rotation axis, from the shielding position that blocks the effective contact area to the open position that lies flat, so as to expose the effective contact area of ​​the electrical contact 11.

[0069] Specifically, after the sensor 44 (limit switch) is triggered by the locking block 422, it sends a position signal to the electric drive unit 45 (micro servo motor). After receiving the signal, the servo motor starts its internal motor, which transmits power to the output shaft through the reduction gear set, driving the rotating shaft of the shielding member 43 to rotate synchronously.

[0070] The rotation angle of the shield 43 is precisely set to 90º. Initially, it is vertically upright, completely blocking the effective contact area of ​​the electrical contact 11. Driven by the servo motor, the shield 43 rotates downward 90º around the rotation axis, eventually lying horizontally, completely separating from the effective contact area of ​​the electrical contact 11. This allows the conductive sheet of the battery pack 2 to fully adhere to the electrical contact 11, establishing a stable electrical connection. When the servo motor drives the shield 43 to rotate to the preset lying position, its internal position detection mechanism (such as a Hall sensor or potentiometer) sends a positioning signal, and the motor stops rotating, ensuring the accurate positioning of the shield 43.

[0071] In one example of this application, the shielding member 43 is provided with different visual markings, corresponding to the shielding position and the open position respectively.

[0072] Specifically, on the outer end face of the shielding component 43 (the side facing the side wall of the base 1), two color blocks, one red and one green, are set along its flipping trajectory and are formed by spraying with wear-resistant and high-temperature resistant paint. A rectangular observation window is opened on the side wall of the base 1 at the position corresponding to the flipping trajectory of the shielding component 43. The size of the observation window is slightly larger than the size of the color block to ensure that the color block can be fully exposed when the shielding component 43 is in different positions.

[0073] When the shielding component 43 is in the upright shielding position, a red indicator appears in the observation window, indicating that the power is off. When the shielding component 43 is flipped to the flat open position, a green indicator appears in the observation window, indicating that an electrical connection has been established. Users can intuitively judge the power status of the tool through the observation window.

[0074] In one embodiment of this application, the guide connection structure includes a guide surface 31 and a boss 32; the guide surface 31 is formed at the open end 33 of the base 1, and the distance between the guide surfaces 31 gradually decreases inward along the open end 33; the boss 32 is disposed on the battery pack 2 and matches the guide surface 31, and is used for automatic alignment when the battery pack 2 is inserted into the base 1.

[0075] Specifically, the guide connection structure consists of a guide surface 31 on the base 1 and a boss 32 on the battery pack 2, which complement each other. Two tapered guide surfaces 31 are symmetrically machined on the inner wall of the opening end 33 of the base 1. The inlet spacing of the guide surfaces 31 is set to 30mm, and after extending inwards by 50mm along the insertion direction of the battery pack 2, the spacing gradually decreases to 28mm, forming a continuous tapering guide channel. The taper of the guide surfaces 31 is set to 5º to ensure smooth insertion.

[0076] At the insertion end of the battery pack 2, two conical bosses 32 are integrally formed, perfectly matching the taper of the guide surface 31. The height of the bosses 32 is the same as the length of the guide surface 31, and the gap between the outer wall of the bosses 32 and the inner wall of the guide surface 31 does not exceed 0.1mm. When the battery pack 2 is inserted, even if there is an assembly offset of ±1mm, the bosses 32 will automatically correct their position through sliding contact under the gradual constraint of the guide surface 31, so that the assembly center axis of the battery pack 2 and the base 1 coincides, ensuring the alignment accuracy of the electrical contacts 11 and the conductive sheets of the battery pack 2.

[0077] In one example of this application, the guide surface 31 and / or the boss 32 are provided with an anti-misinsertion structure.

[0078] Specifically, the anti-misinsertion structure adopts a complementary "protrusion-groove" design. In the middle of one of the guide surfaces 31, a rectangular protrusion is integrally formed, and the edges of the protrusion are rounded to avoid scratching the battery pack 2.

[0079] On the same side of the battery pack 2, at the corresponding position of the boss 32, a rectangular groove is made that precisely matches the size of the boss. The depth of the groove is 0.2mm greater than the height of the boss, ensuring that the boss can be fully embedded in the groove during assembly. When the battery pack 2 is inserted in reverse or misaligned, the side of the boss 32 without the groove will physically interfere with the boss of the guide surface 31, preventing further insertion into the base 1. This structurally eliminates the risk of damage to the electrical contacts 11 or short circuit caused by misinsertion.

[0080] In one example of this application, all components of the linkage shielding mechanism are integrated on the base 1.

[0081] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A reciprocating cutting tool, characterized in that, include: The base (1) is provided with electrical contacts (11); A battery pack (2) is provided for detachable connection to the base (1); the battery pack is provided with an electrical connection part (21) that matches the electrical contacts (11). A guide connection structure is disposed between the base (1) and the battery pack (2) to guide the installation of the battery pack (2); The linkage shielding mechanism includes an action input component (41), a mechanical locking component (42), and a shielding component (43). In the initial state where the battery pack (2) is installed on the base (1) along the guide connection structure, the shielding member (43) is in the shielding position to physically isolate the effective contact area of ​​the electrical contact (11) and prevent the electrical contact (11) from contacting the electrical connection part (21); The motion input (41) is driven to connect with the mechanical locking assembly (42) and is linked with the shielding member (43). When the motion input (41) is operated, the mechanical locking assembly (42) is first driven to make the battery pack (2) and the base (1) reach a fully mechanically locked state. Then, the shielding member (43) is driven to move from the shielding position to the open position, thereby exposing the effective contact area of ​​the electrical contact (11) to establish an electrical connection between the electrical contact (11) and the electrical connection part (21).

2. The reciprocating cutting tool according to claim 1, characterized in that, Before the shielding member (43) leaves the shielding position, the mechanical locking assembly (42) has completed the action of achieving a fully mechanically locked state between the battery pack (2) and the base (1).

3. The reciprocating cutting tool according to claim 2, characterized in that, The shielding member (43) is rotatably disposed in the effective contact area of ​​the electrical contact (11); The linkage shielding mechanism is provided with an elastic reset member, which acts on the shielding member (43) to make the shielding member (43) have a rotational tendency to return from the open position to the shielding position.

4. The reciprocating cutting tool according to claim 1, characterized in that, The mechanical locking assembly (42) includes: Eccentric wheel mechanism; The eccentric wheel mechanism includes an eccentric cam fixedly connected to the motion input (41) and a locking block (422) slidably disposed in the base (1); rotating the motion input (41) causes the locking block (422) to be radially pushed by the eccentric cam to apply radial rigid pressure to the battery pack (2) and eliminate the connection gap.

5. The reciprocating cutting tool according to claim 4, characterized in that, The linkage shielding mechanism also includes: Sensor (44) and electric drive (45); the sensor (44) is installed on the inner wall of the base (1) and is used to detect whether the locking block (422) has reached the fully locked position; the electric drive (45) is connected to the rotating shaft of the shield (43).

6. The reciprocating cutting tool according to claim 5, characterized in that, Upon receiving the position signal from the sensor (44), the electric drive (45) drives the shielding member (43) to rotate around the rotation axis, from the shielding position that blocks the effective contact area to the open position that lies flat, so as to expose the effective contact area of ​​the electric contact (11).

7. The reciprocating cutting tool according to claim 1, characterized in that, The shielding component (43) is provided with different visual markings, corresponding to the shielding position and the open position respectively.

8. The reciprocating cutting tool according to claim 1, characterized in that, The guide connection structure includes a guide surface (31) and a boss (32); the guide surface (31) is formed at the open end (33) of the base (1), and the distance between the guide surfaces (31) gradually decreases inward along the open end (33); the boss (32) is disposed on the battery pack (2) and matches the guide surface (31) for automatic alignment when the battery pack (2) is inserted into the base (1).

9. The reciprocating cutting tool according to claim 8, characterized in that, The guide surface (31) and / or the boss (32) are provided with an anti-misinsertion structure.

10. The reciprocating cutting tool according to claim 1, characterized in that, All components of the linkage shielding mechanism are integrated on the base (1).

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