Reciprocating saw with quick-change structure

Abstract

The technical scheme belongs to the technical field of reciprocating saws, and particularly relates to a reciprocating saw with a quick-change structure, which comprises a shell, a saw blade and a cutter mounting sleeve, and the rear end of the saw blade is mounted in the cutter mounting sleeve matched with the saw blade; the saw blade is detachably connected with the cutter mounting sleeve through a cutter locking mechanism; the cutter locking mechanism comprises a button moving in the shell, a clamping and pushing piece moving in the cutter containing sleeve and a torsional spring, the cutter containing sleeve is provided with a protruding through hole allowing the clamping and pushing piece to penetrate through, the lower end of the button movably abuts against the upper end of the clamping and pushing piece, the lower end of the clamping and pushing piece extends to form a clamping hook, and the saw blade is correspondingly provided with a clamping groove used for containing the clamping hook. The clamping and pushing piece tends to move towards the button under the action of the torsion spring, the clamping hook and the clamping groove are kept in an embedded matching state, and the saw blade is automatically locked. When the saw blade is replaced, the button is pressed to slide, the button pushes the clamping and pushing piece to move reversely, the clamping hook is immediately separated from the saw blade clamping groove, a new saw blade is installed after an old saw blade is pulled out, the button is loosened to be locked again, replacement operation is convenient, auxiliary tools are not needed, and use convenience is improved.

Description

TECHNICAL FIELD

[0001] The technical scheme relates to the technical field of reciprocating saws, in particular to a reciprocating saw with a quick-change structure. BACKGROUND

[0002] A reciprocating saw is a kind of electric cutting tool, which drives a saw blade to perform high-speed forward and backward reciprocating motion to cut workpieces, and the cutting objects can be wood, metal or other materials.

[0003] The saw blade of the reciprocating saw on the market is usually replaceable, but its installation method needs to use more connecting accessories, and the blade is fixed by screwing, which makes it necessary to use a special tool to screw the screw when disassembling and assembling the saw blade, the operation steps are relatively complicated, the replacement efficiency is reduced, the overall working efficiency of the reciprocating saw is affected, on the other hand, since the saw blade is in a working vibration state for a long time, the screw is easy to loosen due to insufficient self-locking force, which not only affects the cutting accuracy and stability, but also may cause damage to the saw blade, increases the use cost and operation risk, and is inconvenient to use, and needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] The technical scheme is provided to improve the problem that the reciprocating saw has a complex disassembly and replacement structure, low replacement efficiency and inconvenience in use, and provides a reciprocating saw with a quick-change structure.

[0005] The purpose of the technical scheme is achieved as follows:

[0006] The reciprocating saw with a quick-change structure comprises:

[0007] a housing;

[0008] a saw blade arranged at the front end of the housing;

[0009] a blade mounting sleeve arranged in the housing, and the rear end of the saw blade is mounted in the matching blade mounting sleeve; and

[0010] a blade locking mechanism, the saw blade and the blade mounting sleeve are detachably connected through the blade locking mechanism;

[0011] The blade locking mechanism comprises a button movably arranged on the housing, a clamping push piece movably arranged on the blade mounting sleeve, and a torsional spring, the blade mounting sleeve is provided with a protruding through hole for the clamping push piece to pass through, the lower end of the button movably abuts against the upper end of the clamping push piece, the lower end of the clamping push piece extends a clamping hook, a clamping groove for accommodating the clamping hook is arranged on the saw blade, and the clamping push piece has a tendency to move towards the button under the action of the torsional spring, so that the clamping hook and the clamping groove are in a fitted state.

[0012] By the technical scheme, when the reciprocating saw with the quick-change structure is normally used, the elastic force of the torsion spring pushes the clamping push piece to move to the button direction, so that the clamping hook at the lower end of the clamping push piece is embedded into the clamping groove of the saw blade, and automatic locking of the saw blade and the tool mounting sleeve is realized; when the saw blade is replaced, the user presses the button on the shell with one hand, the sliding of which directly pushes the upper end of the clamping push piece, forcing the clamping push piece to move reversely against the resistance of the torsion spring, and the clamping hook is immediately disengaged from the saw blade clamping groove; at this time, the old saw blade can be directly pulled out, and after the new saw blade is mounted, the button is released, the torsion spring is reset to push the clamping push piece to move forward, and the clamping hook is automatically embedded into the new saw blade clamping groove to complete locking, so that the replacement operation is convenient and fast, no auxiliary tool is needed, and the use convenience is improved.

[0013] Preferably, when the rear end face of the saw blade abuts against the inner wall of the tool mounting sleeve, the clamping hook is arranged in position with the clamping groove.

[0014] By the technical scheme, when assembling, the user only needs to push the saw blade into the tool mounting sleeve along the axial direction until the rear end face abuts against the inner wall, that is, a physical limit is triggered, at this time, the clamping groove and the clamping hook are accurately matched in position, manual alignment of the positions of the clamping groove and the clamping hook is not needed, the step of calibrating and assembling is omitted, and the operation continuity and convenience are improved.

[0015] Preferably, the tool mounting sleeve is provided with a mounting hole, the size of the mounting hole is matched with that of the clamping hook, so that the clamping push piece can be installed into the tool mounting sleeve through the mounting hole.

[0016] By the technical scheme, the mounting hole and the clamping hook are accurately matched in size, so that the clamping push piece carrying the clamping hook can be installed into the tool mounting sleeve through the mounting hole, and the upper end of the clamping push piece can correspondingly pass through the through hole and naturally protrude to the working position, so that the clamping push piece can be quickly disassembled and replaced without disassembling the tool mounting sleeve body.

[0017] Preferably, the tool mounting sleeve is provided with a mounting hole, the size of the mounting hole is matched with that of the clamping hook, so that the clamping push piece can be installed into the tool mounting sleeve through the mounting hole.

[0018] A fixing sleeve is arranged in the shell, and the tool mounting sleeve is slidably arranged in the fixing sleeve;

[0019] A gear member is rotationally arranged in the shell, and the gear member is eccentrically provided with an eccentric rod;

[0020] An eccentric ring is fixedly arranged at the end of the tool mounting sleeve, the eccentric ring extends to the side of the gear member, the eccentric ring has an eccentric groove, and the eccentric rod is limited in the eccentric groove.

[0021] The output end of the driving motor drives the gear piece to rotate, and the gear piece drives the tool mounting sleeve to slide reciprocatingly in the fixed sleeve through the cooperation of the eccentric rod and the eccentric groove. The rotation of the gear piece switches the eccentric rod between the first position and the second position. When the eccentric rod is in the first position, the rear end of the tool mounting sleeve is swung upward, so that the saw blade is in an inclined state to the workpiece. When the eccentric rod is in the second position, the tool mounting sleeve drives the saw blade to reset to a horizontal state.

[0022] Through the above technical solution, the driving motor drives the gear piece to rotate, and the eccentric rod is embedded in the eccentric ring groove at the end of the tool mounting sleeve, converting the circular motion into the horizontal reciprocating sliding of the tool mounting sleeve in the fixed sleeve. The saw blade can cut the workpiece. When the eccentric rod rotates to the first position, the eccentric rod pushes against the side wall of the eccentric groove, and the tool mounting sleeve is forced to lift the rear end through the geometric constraint of the eccentric groove. The saw blade is inclined to the workpiece, increasing the cutting angle of the saw blade (increasing the cutting depth), so that the saw blade can continuously exert a force on the workpiece. When it is turned to the second position, the tool mounting sleeve resets to the horizontal state, and the saw blade maintains the standard cutting posture. The operation is reciprocatingly run during the cutting process, deepening the cutting depth and intensity, shortening the processing time, and improving the cutting efficiency and rate.

[0023] Preferably, a gap is left between the tool mounting sleeve and the inner wall of the fixed sleeve, and the tool mounting sleeve swings through the gap by an angle less than or equal to 1°.

[0024] Through the above technical solution, the gap provides the swinging space of the tool mounting sleeve in the fixed sleeve. If the swinging amplitude is too large, the cutting angle of the saw blade will be too large. The range of the swingable angle of the tool mounting sleeve is limited to less than or equal to 0.5°, so as to reduce the damage to the saw blade.

[0025] Preferably, the eccentric rod is sleeved with a bearing piece.

[0026] Through the above technical solution, the outer raceway of the bearing piece forms a rolling fit with the wall of the eccentric ring groove, replacing the sliding friction between the original eccentric rod and the wall of the eccentric ring groove, reducing the scraping damage, and improving the durability.

[0027] Preferably, the tool mounting sleeve is provided with an avoiding groove corresponding to the position of the gear piece.

[0028] Through the above technical solution, the avoiding groove profile matches the outer diameter of the gear piece. When the tool mounting sleeve slides close to the gear piece, the gear piece is partially embedded in the groove to achieve spatial avoidance, reducing the risk of collision and interference, and increasing the compactness of the structure.

[0029] Preferably, the fixed sleeve is provided with an avoiding hole for the button to pass through, and the upper end of the clamping and pushing piece protrudes from the avoiding hole.

[0030] Through the above technical solution, the hole diameter of the avoiding hole is greater than the outer diameter of the button, providing a non-interference movement channel for the button.

[0031] Preferably, the shell has a clearance hole matched with the button, and the button is exposed from the clearance hole.

[0032] Through the above technical scheme, the button can be pressed and contacted through the clearance hole, and the normal interactive use of the button is ensured by limiting the sliding direction of the button.

[0033] Preferably, the button is provided with an anti-extraction part abutting against the inner wall of the shell for limiting the button from being extracted from the clearance hole.

[0034] Through the above technical scheme, the anti-extraction part of the side part of the button abuts against the inner wall of the shell to form a hard block in the axial direction, thereby blocking the extraction of the button.

[0035] The technical scheme has the following prominent and beneficial technical effects compared with the prior art:

[0036] 1. The technical scheme pushes the clamping piece by the torsional spring, so that the clamping hook is embedded into the saw blade clamping groove to realize automatic locking, the saw blade is locked by the lock mechanism, when the saw blade is replaced, the clamping hook is separated by pressing the button, the lock mechanism is unlocked, the saw blade can be pulled out and replaced, the replacement operation is convenient and fast, no auxiliary tool is needed, and the use convenience is improved.

[0037] 2. The technical scheme sets the lifting mechanism, the driving motor drives the gear piece to rotate, the eccentric rod of the gear piece is matched with the eccentric ring groove on the tool mounting sleeve to convert the rotary motion into the horizontal reciprocating motion of the tool mounting sleeve; when the eccentric rod is turned to a specific position (a first position), the tool mounting sleeve is pushed at the rear end to be lifted, the saw blade is inclined to cut into the workpiece, the cutting angle and the feeding force are increased, when the eccentric rod is turned to another position (a second position), the tool mounting sleeve is reset to be horizontal, and therefore the cutting efficiency and speed are improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0039] Figure 2 It is a schematic diagram of the local structure of the embodiment after the hidden part of the shell is removed;

[0040] Figure 3 It is a schematic diagram of the local cross section of the embodiment when the eccentric rod is at a first position;

[0041] Figure 4 It is a schematic diagram of the local structure of the embodiment; Figure 3 a local enlarged schematic diagram;

[0042] Figure 5 It is a schematic diagram of the local structure of the lock mechanism in the embodiment;

[0043] Figure 6 It is a schematic diagram of the local structure of the lock mechanism in the embodiment; Figure 5Another view of the gear member after being hidden

[0044] Figure 7 For the embodiment Figure 6 Partial explosion schematic.

[0045] Reference signs: 1, housing; 2, saw blade; 3, knife mounting sleeve; 4, knife locking mechanism; 41, button; 42, clamping push piece; 43, torsional spring; 5, through hole; 61, clamping hook; 62, clamping groove; 7, driving motor; 8, knife lifting mechanism; 81, fixed sleeve; 82, gear member; 83, eccentric ring; 9, eccentric rod; 10, eccentric groove; 11, bearing member; 12, avoiding groove; 13, avoiding hole; 14, position giving hole; 15, anti-falling part; 16, mounting hole; 100, transmission gear. DETAILED DESCRIPTION

[0046] The specific embodiments of the technical solution will be further described in detail below with reference to the accompanying drawings.

[0047] Embodiment:

[0048] Referring to Figure 1 and Figure 2 , a reciprocating saw with a quick-change structure includes a housing 1 and a saw blade 2. An opening one is formed through the front end of the housing 1, and the rear end of the saw blade 2 is inserted into the housing 1 through the opening one for installation, and the front end of the saw blade 2 extends correspondingly forward out of the housing 1, and the lower edge of the saw blade 2 has saw teeth for cutting use. The housing 1 is provided with a driving motor 7, which is fixedly installed inside the housing 1, and the output end of the driving motor 7 is arranged towards the direction of the saw blade 2. A battery is also installed in the housing 1, which is installed at the rear end of the housing 1, and the battery is electrically connected to the driving motor 7 for storing electrical energy and providing the driving motor 7 with electrical energy required for operation.

[0049] Referring to Figure 2 , Figure 3 and Figure 4 , the housing 1 is provided with a knife lifting mechanism 8, which includes a fixed sleeve 81, a gear member 82 and an eccentric ring 83. The fixed sleeve 81 is fixedly installed inside the housing 1, and the fixed sleeve 81 has an opening two formed through the direction towards the opening one. The knife lifting mechanism 8 also includes a knife mounting sleeve 3, which is slidingly installed inside the corresponding fixed sleeve 81. The sliding direction of the knife mounting sleeve 3 is limited by the inner wall of the fixed sleeve 81, and a gap is left between the knife mounting sleeve 3 and the inner wall of the fixed sleeve 81. The knife mounting sleeve 3 can swing in the fixed sleeve 81 by a certain angle through the gap, and the swing angle is α, which is less than or equal to 1°, and α is preferably 0.5°, that is, the knife mounting sleeve 3 can swing by an angle of 0.5°. One end of the knife mounting sleeve 3 corresponding to the opening two has an opening three, and the rear end of the saw blade 2 can be inserted into the knife mounting sleeve 3 through the opening three.

[0050] The gear member 82 is preferably a bevel gear, which is located inside the fixed sleeve 81 and rotationally connected to the inner side wall of the fixed sleeve 81. The rotational connection can be achieved by a pin shaft arranged between the fixed sleeve 81 and the gear member 82. The output end of the driving motor 7 penetrates through the rear end of the fixed sleeve 81, and a transmission gear 100 is coaxially arranged on the output end of the driving motor 7. The transmission gear 100 is preferably a bevel gear, which is located inside the fixed sleeve 81 and has a rotational axis perpendicular to the rotational axis of the gear member 82, and the two gears are in meshing transmission.

[0051] The eccentric ring 83 is integrally connected to the rear end of the tool mounting sleeve 3 close to the driving motor 7 and located beside the gear member 82. The inner side of the eccentric ring 83 has an eccentric groove 10 in the shape of a strip-shaped groove. The gear member 82 is eccentrically provided with an eccentric rod 9, which penetrates into the eccentric groove 10. The outer side of the eccentric rod 9 is further sleeved with a bearing member 11.

[0052] The driving motor 7 drives the transmission gear 100 to rotate, which in turn drives the gear member 82 to rotate synchronously through meshing transmission. The gear member 82 drives the inner wall of the eccentric groove 10 through the eccentric rod 9 and the bearing member 11 to drive the tool mounting sleeve 3 to reciprocatingly slide along the fixed sleeve 81, thereby converting the circular motion into the sliding motion of the tool mounting sleeve 3, and achieving the reciprocating cutting of the saw blade 2 on the workpiece. The eccentric rod 9 is switched between the first position and the second position, Figure 3 The position of the eccentric rod 9 shown in the figure is the first position, which is the highest point of the gear member 82. At this time, the rear end of the tool mounting sleeve 3 is swung upward, and the swinging angle is α (0.5°). The saw blade 2 is in an inclined state to the workpiece. When the eccentric rod 9 is in the second position, it is at the lowest point of the gear member 82. The tool mounting sleeve 3 drives the saw blade 2 to return to the horizontal state. Thus, when the eccentric rod 9 moves to the first position, the tool mounting sleeve 3 applies a force to the saw blade 2, which is directed to the workpiece, thereby deepening the cutting depth and shortening the processing time, and improving the cutting efficiency and rate.

[0053] Referring to Figure 5 , Figure 6 and Figure 7 , the tool mounting sleeve 3 is provided with an avoiding groove 12 corresponding to the position of the gear member 82. The saw blade 2 is detachably connected to the tool mounting sleeve 3 through the lock tool mechanism 4. The lock tool mechanism 4 includes a button 41, a clamping piece 42, and a torsional spring 43. The lower end of the clamping piece 42 extends outwardly with a clamping hook 61. The tool mounting sleeve 3 is provided with a mounting hole 16, which has a larger cross-sectional size than the cross-sectional size of the clamping hook 61. The clamping piece 42 is installed into the tool mounting sleeve 3 through the mounting hole 16 and is slidingly connected to the tool mounting sleeve 3. The tool mounting sleeve 3 is further provided with a through hole 5, which is located opposite to the mounting hole 16. The fixed sleeve 81 is further provided with an avoiding hole 13, which is in communication with the through hole 5. The upper end of the clamping piece 42 penetrates through the through hole 5 and protrudes into the avoiding hole 13.

[0054] The shell 1 has a clearance hole 14 matched with the button 41, the button 41 is exposed from the clearance hole 14, the button 41 is slidingly installed at the clearance hole 14, and the sliding direction is perpendicular to the sliding direction of the tool mounting sleeve 3 and parallel to the sliding direction of the clamping push piece 42; the button 41 is provided with anti-dropping parts 15, the two anti-dropping parts 15 are symmetrically protruded on the front and rear sides of the button 41, and are used for abutting against the inner wall of the shell 1 to limit the outward dropping of the button 41 from the clearance hole 14.

[0055] One end of the torsion spring 43 is fixed on the tool mounting sleeve 3, and the other end abuts against the lower side of the clamping hook 61; the saw blade 2 is provided with a clamping groove 62, and the sleeve hole depth of the tool mounting sleeve 3 is further designed, when the saw blade 2 is inserted and the rear end surface of the saw blade 2 abuts against the inner wall of the tool mounting sleeve 3, the clamping hook 61 is opposite to the clamping groove 62, at this time, the button 41 is released, the clamping push piece 42 is pushed by the elastic force of the torsion spring 43, the clamping hook 61 is correspondingly embedded in the clamping groove 62 and abuts against the inner wall of the clamping groove 62, so as to limit the pulling out of the saw blade 2; when it is needed to be pulled out, the button 41 is pressed, the button 41 slides downward to press the clamping push piece 42, the clamping push piece 42 overcomes the elastic force of the torsion spring 43, the clamping hook 61 is separated from the clamping groove 62, and the saw blade 2 can be pulled out from the opening of the tool mounting sleeve 3, so that the operation is convenient and the use is convenient.

[0056] The tool mounting sleeve 3 drives the clamping push piece 42 to slide to any position, and the button 41 can be pressed to the clamping push piece 42 protruding from the clearance hole 13.

[0057] The specific working process of the scheme is as follows:

[0058] The technical scheme pushes the clamping push piece 42 to move to the direction of the button 41 by the elastic force of the torsion spring 43, so that the clamping hook 61 at the lower end of the clamping push piece 42 is embedded in the clamping groove 62 of the saw blade 2, and the automatic locking of the saw blade 2 and the tool mounting sleeve 3 is realized; when the saw blade 2 is replaced, a user presses the button 41 on the shell 1 with one hand, the sliding direction of the button 41 directly pushes the upper end of the clamping push piece 42, forces the clamping push piece 42 to move reversely by overcoming the resistance of the torsion spring 43, and the clamping hook 61 is separated from the clamping groove 62 of the saw blade 2, at this time, the old saw blade 2 can be directly pulled out, after the new saw blade 2 is mounted, the button 41 is released, the clamping push piece 42 is pushed forward by the reset of the torsion spring 43, and the clamping hook 61 is automatically embedded in the clamping groove 62 of the new saw blade 2 to lock the new saw blade 2, so that the replacement operation is convenient and fast, no auxiliary tool is needed, and the use convenience is improved.

[0059] The basic principle and main features of the technical solution and the advantages of the technical solution are shown and described above. Those skilled in the art should understand that the technical solution is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the technical solution. Without departing from the spirit and scope of the technical solution, various changes and improvements can be made to the technical solution, and these changes and improvements all fall within the scope of the claimed technical solution. The scope of protection of the technical solution is defined by the appended claims and their equivalents.

Claims

1. A reciprocating saw having a quick change structure, characterized by, The utility model relates to a kind of saw blade locking mechanism, including: Housing (1); Saw blade (2), which is provided at the front end of the housing (1); Blade holder (3), which is provided in the housing (1), and the rear end of the saw blade (2) is installed in the matching blade holder (3);And Locking mechanism (4), the saw blade (2) and the blade holder (3) are detachably connected through the locking mechanism (4); Wherein, the locking mechanism (4) includes a button (41) movably arranged in the housing (1), a card push piece (42) movably arranged in the blade holder (3) and a torsional spring (43), the blade holder (3) is provided with a through hole (5) for the card push piece (42) to protrude, the lower end of the button (41) is movably abutted on the upper end of the card push piece (42), the lower end of the card push piece (42) extends a clamping hook (61), the corresponding saw blade (2) is provided with a clamping groove (62) for accommodating the clamping hook (61), the card push piece (42) has a tendency to move towards the button (41) under the action of the torsional spring (43), so that the clamping hook (61) and the clamping groove (62) are in the embedded state.

2. The reciprocating saw with quick change structure according to claim 1, characterized in that: When the rear end surface of the saw blade (2) abuts against the inner wall of the blade holder (3), the clamping hook (61) and the clamping groove (62) are arranged in position.

3. The reciprocating saw with quick change structure according to claim 1, characterized in that: The blade holder (3) is provided with a mounting hole (16), and the size of the mounting hole (16) is matched with that of the clamping hook (61), so that the card push piece (42) can be installed into the blade holder (3) through the mounting hole (16).

4. The reciprocating saw with quick change structure according to claim 1, characterized in that: Further comprising a driving motor (7) arranged in the housing (1), characterized in that the housing (1) is provided with a lifting mechanism (8), and the lifting mechanism (8) comprises: A fixed sleeve (81) is arranged in the housing (1), and the blade holder (3) is slidably arranged in the fixed sleeve (81); A gear member (82) is rotatably arranged in the housing (1), and the gear member (82) is eccentrically provided with an eccentric rod (9); An eccentric ring (83) is fixedly arranged at the end of the blade holder (3), and the eccentric ring (83) extends to the side of the gear member (82), the eccentric ring (83) has an eccentric groove (10), and the eccentric rod (9) is limited in the eccentric groove (10); The output end of the driving motor (7) drives the rotation of the gear member (82), and the gear member (82) drives the blade holder (3) to reciprocally slide along the fixed sleeve (81) through the cooperation of the eccentric rod (9) and the eccentric groove (10); the rotation of the gear member (82) switches the eccentric rod (9) between the first position and the second position, when the eccentric rod (9) is in the first position, the rear end of the blade holder (3) is swung upward, so that the saw blade (2) is in the state of tilting towards the workpiece; when the eccentric rod (9) is in the second position, the blade holder (3) drives the saw blade (2) to reset to the horizontal state.

5. The reciprocating saw with quick change structure according to claim 4, characterized in that: A gap is left between the blade holder (3) and the inner wall of the fixed sleeve (81), and the blade holder (3) swings through the gap with an angle less than or equal to 1°.

6. The reciprocating saw with quick change structure according to claim 4, characterized in that: The eccentric rod (9) is sleeved with a bearing member (11).

7. The reciprocating saw with quick change structure according to claim 4, characterized in that: The knife mounting sleeve (3) is provided with an avoiding groove (12) corresponding to the position of the gear part (82).

8. The reciprocating saw with quick change structure according to claim 4, characterized in that: The fixing sleeve (81) is provided with an avoiding hole (13) for the button (41) to pass through, and the upper end of the clamping push piece (42) protrudes from the avoiding hole (13).

9. The reciprocating saw with quick change structure according to claim 1, characterized in that: The shell (1) is provided with a position giving hole (14) matched with the button (41), and the button (41) is exposed from the position giving hole (14).

10. The reciprocating saw with quick change structure according to claim 8, characterized in that: The button (41) is provided with an anti-falling part (15) which abuts against the inner wall of the shell (1) to limit the falling of the button (41) from the position giving hole (14).

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