Quick clamping mechanism for swing blade saw

Abstract

The present application relates to a kind of quick clamping mechanism of swing shovel saw blade.The present application includes gear box, is connected to the machine body of electric tool;Main shaft is arranged in the gear box, the surface of the main shaft is provided with radial hole;Locking rod is axially through the main shaft, the surface of the locking rod is provided with radial groove;First elastic element provides the elastic force of the upper end of the locking rod away from the upper end of the main shaft;Retaining assembly includes the retaining frame of main shaft and limiting piece, the limiting piece can be contacted by the radial hole and radial groove, to limit the relative movement of main shaft and the locking rod, the second elastic element is arranged between the main shaft and retaining frame;Toggle component is arranged on the upper end of gear box, to provide the force that the lower end of the locking rod is separated from the lower end of the main shaft;The present application can enable user to operate with one hand to install and disassemble saw blade, simultaneously applicable to different types of saw blade.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and in particular to a quick-clamping mechanism for a swing saw blade. Background Technology

[0002] Currently, a common saw blade clamping mechanism in power tools is the swing saw blade clamping mechanism. However, this design requires the user to hold the saw blade with one hand and use the other hand to operate a lever to lock it, ensuring the saw blade remains stable during use. This operation method is relatively cumbersome, requiring both hands and is not convenient.

[0003] Bosch developed a technology called Starlock that allows users to operate the saw blade with one hand. However, a drawback of this technology is that its saw blade is proprietary and cannot clamp other general-purpose saw blades available on the market. Therefore, in some situations, users cannot use ordinary general-purpose saw blades, limiting its flexibility and convenience. Summary of the Invention

[0004] Therefore, the present invention provides a quick clamping mechanism for swing saw blades, which is designed to allow users to install and remove saw blades with one hand, and is also applicable to conventional general-purpose saw blades.

[0005] To solve the above-mentioned technical problems, the present invention provides a quick clamping mechanism for a swing saw blade, comprising:

[0006] Gearbox, attached to the body of the power tool;

[0007] A spindle is disposed inside the gearbox, and a radial hole is provided on the surface of the spindle;

[0008] A locking rod passes axially through the main shaft, and a radial groove is provided on the surface of the locking rod;

[0009] The first elastic element provides an elastic force at the upper end of the locking rod away from the upper end of the main shaft;

[0010] The retaining assembly includes a retainer sleeved on the spindle and a limiting member. The limiting member can contact the radial groove through the radial hole to restrict the relative movement of the spindle and the locking rod. A second elastic element is provided between the spindle and the retainer.

[0011] An actuating assembly is disposed at the upper end of the gearbox to provide a force for separating the lower end of the locking rod from the lower end of the spindle;

[0012] When the locking rod is in the released position, a clamping space for clamping the saw blade can be formed between the lower end of the locking rod and the lower end of the spindle.

[0013] The saw blade pushes the retainer upward and compresses the second elastic element, causing the limiting member to leave the radial groove and enter the retainer, so that the locking rod is in the locked position and the clamping saw blade is clamped.

[0014] In one embodiment of the present invention, a bearing is provided inside the gearbox, and the main shaft is mounted inside the gearbox via the bearing.

[0015] In one embodiment of the present invention, the main shaft is connected to a shift fork, which swings about the central axis of the main shaft.

[0016] In one embodiment of the present invention, a limiting plate is provided at the upper end of the locking rod, and the first elastic element includes a spring sleeved on the locking rod, with its two ends respectively abutting against the upper end of the main shaft and the limiting plate.

[0017] In one embodiment of the present invention, a locking nut is connected to the lower end of the locking rod, and a mounting protrusion corresponding to the saw blade mounting hole is provided at the lower end of the main shaft, and the clamping space is formed between the locking nut and the mounting protrusion.

[0018] In one embodiment of the present invention, the through hole of the retainer includes a sliding section and a receiving section in the axial direction. The receiving section is provided with a receiving groove corresponding to the position of the radial groove. The limiting member can slide through the sliding section and enter the receiving groove.

[0019] In one embodiment of the present invention, an annular plate extends radially from the lower end of the spindle, and a plurality of protrusions passing through the annular plate are provided at the lower end of the cage.

[0020] In one embodiment of the present invention, a fixing plate is provided inside the gearbox, and the second elastic element includes a spring sleeved on the main shaft, with its two ends abutting against the fixing plate and the upper end of the retainer, respectively.

[0021] In one embodiment of the invention, the gearbox is connected to an upper end cover, and the actuating assembly includes a wrench, a pin, and a torsion spring. One end of the wrench is provided with a cam, and the wrench is connected to the upper end cover via the torsion spring. The pin passes through the upper end cover, with one end contacting the upper end of the locking rod and the other end slidingly contacting the cam. The surface of the cam is configured to drive the pin downward when the wrench is rotated in a first direction to compress the first elastic element. The torsion spring is used to provide a force for the wrench to rotate in a second direction opposite to the first direction.

[0022] In one embodiment of the invention, the contact surface between the radial groove and the limiting member is configured to have a force that drives the limiting member to move radially when the locking rod moves relative to the main shaft.

[0023] The technical solution of the present invention has the following advantages compared with the prior art:

[0024] The swing saw blade quick-clamping mechanism described in this invention allows users to install and remove the saw blade with one hand, greatly improving operational convenience. Users simply insert the saw blade and press upwards to complete the installation, eliminating the need for both hands to lock the lever and the saw blade, significantly saving time and effort.

[0025] The saw blade clamping mechanism of this invention is designed to be compatible with general-purpose saw blades on the market, without being limited by patented saw blades, and offers high flexibility and convenience. Users can select different types of saw blades according to their actual needs without worrying about usage problems caused by incompatible saw blades.

[0026] The clamping space between the locking rod and the spindle of this invention can accommodate saw blades of various thicknesses and remain stable when the saw blade is clamped. The contact design between the limiting member and the radial groove can effectively limit the relative movement between the locking rod and the spindle.

[0027] The design of the radial holes, radial grooves, and limiting components of the saw blade clamping mechanism of this invention results in less wear during saw blade installation and removal, thus enabling long-term and stable use. Attached Figure Description

[0028] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the clamping mechanism of the present invention in the released state.

[0030] Figure 2 This is a schematic diagram of the clamping mechanism of the present invention in the locked state.

[0031] Figure 3 This is a schematic diagram of the cage structure of the present invention.

[0032] Figure 4 This is a schematic diagram of a conventional oscillating saw blade structure.

[0033] Figure 5 This is a schematic diagram of the lower end structure of the main shaft of the present invention.

[0034] Explanation of reference numerals in the instruction manual:

[0035] 1. Gearbox; 3. Torsion spring; 4. Cam; 5. Fixing plate; 6. Saw blade; 7. Limiting element; 8. Bolt; 9. Wrench; 10. Pin; 11. Upper end cover; 12. Cage; 12a. First protrusion; 12b. Second protrusion; 13. Spindle; 14. First elastic element; 15. Shift fork; 16. Second elastic element; 17. Locking rod; 18. Bearing; 19. Locking nut. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0037] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0038] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0040] Reference Figures 1 to 2 As shown, a quick-clamping mechanism for a swing saw blade according to the present invention includes:

[0041] Gearbox 1 is connected to the body of the power tool;

[0042] A main shaft 13 is disposed inside the gearbox 1, and a radial hole is provided on the surface of the main shaft 13;

[0043] A locking rod 17 passes axially through the main shaft 13, and a radial groove is provided on the surface of the locking rod 17.

[0044] The first elastic element 14 provides an elastic force at the upper end of the locking rod 17 away from the upper end of the main shaft 13;

[0045] The retaining assembly includes a retainer 12 sleeved on the spindle 13 and a limiting member 7. The limiting member 7 can contact the radial groove through the radial hole to restrict the relative movement of the spindle 13 and the locking rod 17. A second elastic element 16 is provided between the spindle 13 and the retainer 12.

[0046] An actuating assembly is disposed at the upper end of the gearbox 1 to provide a force for separating the lower end of the locking rod 17 from the lower end of the main shaft 13;

[0047] When the locking rod 17 is in the released position, a clamping space for clamping the saw blade 6 can be formed between the lower end of the locking rod 17 and the lower end of the main shaft 13.

[0048] The saw blade 6 pushes the retainer 12 upward and compresses the second elastic element 16, causing the limiting member 7 to leave the radial groove and enter the retainer 12, so that the locking rod 17 is in the locked position, and the clamping saw blade 6 is clamped.

[0049] Specifically, the gearbox 1 is equipped with a bearing 18, and the main shaft 13 is mounted in the gearbox 1 via the bearing 18. The main shaft 13 is connected to a shift fork 15, which swings around the central axis of the main shaft 13. Driven by the transmission structure, the shift fork 15 swings left and right around the central axis of the main shaft 13, and the main shaft 13 moves together with the shift fork 15. The main shaft 13 and the shift fork 15 cannot move up and down due to the restriction of the bearing 18.

[0050] Specifically, a limiting plate is provided at the upper end of the locking rod 17, and the first elastic element 14 includes a spring sleeved on the locking rod 17, with its two ends respectively abutting against the upper end of the main shaft 13 and the limiting plate.

[0051] Specifically, refer to Figure 4 and Figure 5 As shown, a locking nut 19 is connected to the lower end of the locking rod 17, and an installation protrusion corresponding to the mounting hole of the saw blade 6 is provided at the lower end of the main shaft 13. The clamping space is formed between the locking nut 19 and the installation protrusion.

[0052] Specifically, the through hole of the retainer 12 includes a sliding section and a receiving section in the axial direction. The receiving section is provided with a receiving groove corresponding to the position of the radial groove. The limiting member 7 can slide through the sliding section and enter the receiving groove to restrict the axial movement of the retainer 12 relative to the main shaft 13.

[0053] Specifically, the radial hole on the surface of the spindle 13 can be a through hole or a blind hole.

[0054] Specifically, refer to Figure 3 As shown, the lower end of the main shaft 13 has a radially extending annular plate, and the lower end of the retainer 12 is provided with multiple protrusions passing through the annular plate. When the saw blade 6 is pressed upward, it can contact the protrusions, thereby driving the retainer 12 to move upward. This embodiment provides two protrusions, namely the first protrusion 12a and the second protrusion 12b. In other embodiments, more than three protrusions can be provided. In addition, the retainer 12 does not necessarily need to be provided with protrusions; other structures can be used, as long as it can be driven by the saw blade 6.

[0055] Specifically, a fixing plate 5 is provided inside the gearbox 1, and the second elastic element 16 includes a spring sleeved on the main shaft 13, with its two ends abutting against the fixing plate 5 and the upper end of the retainer 12, respectively.

[0056] Specifically, the gearbox 1 is connected to the upper end cover 11 by bolts 8. The actuating assembly includes a wrench 9, a pin 10, and a torsion spring 3. One end of the wrench 9 is provided with a cam 4. The wrench 9 is connected to the upper end cover 11 by the torsion spring 3. The pin 10 passes through the upper end cover 11, with one end contacting the upper end of the locking rod 17 and the other end slidingly contacting the cam 4. The surface of the cam 4 is configured such that, when passing through the wrench 9 along a first direction ( Figure 1 When rotated clockwise, the pin 10 can be driven to move downward to compress the first elastic element 14. The torsion spring 3 is used to provide the wrench 9 in a second direction opposite to the first direction. Figure 1 The force that rotates counterclockwise.

[0057] Specifically, the limiting member 7 is a steel ball or a cylindrical pin, etc., and the contact surface between the radial groove and the limiting member 7 (the surface of the steel ball, the arc-shaped surface of the cylindrical pin, etc.) is configured to have a force that tends to drive the limiting member 7 to move radially toward the retainer 12 when the locking rod 17 moves relative to the main shaft 13. Figure 1 (To the left), preferably an arc-shaped surface. The contact surface between the receiving groove and the limiting member 7 is configured such that when the limiting member 7 (steel ball surface, cylindrical pin arc-shaped surface, etc.) contacts the contact surface and the main shaft 13 simultaneously, it has a force that tends to drive the limiting member 7 to move radially towards the main shaft 13. Figure 1 (To the right), preferably an arc-shaped surface.

[0058] When using, Figure 1 In the released state, Figure 2In the locked state, the retainer 12 is subjected to a downward force under the action of the second spring and is held in this position. The steel ball 7 can move radially in the radial hole but cannot move axially. The limiting member 7 cannot move radially under the action of the radial groove and the sliding section of the retainer 12. The first elastic element 14 is in a compressed state. The locking rod 17 is always subjected to an upward elastic force, but it cannot move up or down under the restriction of the limiting member 7. This keeps the clamping space between the locking rod 17 and the main shaft 13 in an open state, so that the saw blade 6 can be inserted at any time.

[0059] like Figure 1 As shown, when the user does not operate the wrench 9, the wrench 9 is lifted by the torsion spring 3. The user inserts the saw blade 6, aligns the mounting hole on the saw blade 6 with the mounting protrusion of the spindle 13, and presses it upward. The saw blade 6 will drive the retainer 12 to move upward. After the retainer 12 moves upward, the receiving groove will move to the same height as the limiting member 7, so the limiting member 7 has space to move to the left. The locking rod 17 is always subjected to the upward elastic force of the first elastic element 14, thus driving the limiting member 7 to move to the left and enter the receiving groove. After the limiting member 7 moves to the left and leaves the radial groove of the locking rod 17, the locking rod 17 loses its restriction and moves upward under the action of the first elastic element 14, driving the locking nut 19 to move upward and press the saw blade 6 onto the spindle 13. Figure 2 As shown. To unlock, simply lift lever 9.

[0060] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A quick-clamping mechanism for a swing saw blade, characterized in that, include: Gearbox (1) is connected to the body of the power tool; A spindle (13) is disposed inside the gearbox (1), and a radial hole is provided on the surface of the spindle (13); A locking rod (17) passes axially through the main shaft (13), and a radial groove is provided on the surface of the locking rod (17); The first elastic element (14) provides an elastic force at the upper end of the locking rod (17) away from the upper end of the main shaft (13); The retaining assembly includes a retainer (12) sleeved on the spindle (13) and a limiting member (7). The limiting member (7) can contact the radial groove through the radial hole to restrict the relative movement of the spindle (13) and the locking rod (17). A second elastic element (16) is provided between the spindle (13) and the retainer (12). A toggle assembly is provided at the upper end of the gearbox (1) to provide a force that separates the lower end of the locking rod (17) from the lower end of the main shaft (13); When the locking rod (17) is in the released position, a clamping space for clamping the saw blade (6) can be formed between the lower end of the locking rod (17) and the lower end of the main shaft (13); The saw blade (6) pushes the retainer (12) upward and compresses the second elastic element (16), causing the limiting member (7) to leave the radial groove and enter the retainer (12), so that the locking rod (17) is in the locked position, while clamping the saw blade (6); The lower end of the main shaft (13) has an annular plate extending radially, and the lower end of the retainer (12) is provided with a plurality of protrusions passing through the annular plate.

2. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The gearbox (1) is provided with a bearing (18), and the main shaft (13) is installed in the gearbox (1) through the bearing (18).

3. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The main shaft (13) is connected to a fork (15), which swings about the central axis of the main shaft (13).

4. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The upper end of the locking rod (17) is provided with a limiting plate, and the first elastic element (14) includes a spring sleeved on the locking rod (17), and its two ends respectively abut against the upper end of the main shaft (13) and the limiting plate.

5. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The lower end of the locking rod (17) is connected to a locking nut (19), and the lower end of the main shaft (13) is provided with an installation protrusion corresponding to the mounting hole of the saw blade (6). The clamping space is formed between the locking nut (19) and the installation protrusion.

6. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The through hole of the retainer (12) includes a sliding section and a receiving section. The receiving section is provided with a receiving groove corresponding to the position of the radial groove. The limiting member (7) can slide through the sliding section and enter the receiving groove.

7. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The gearbox (1) is provided with a fixing plate (5), and the second elastic element (16) includes a spring sleeved on the main shaft (13), and its two ends abut against the upper ends of the fixing plate (5) and the retainer (12), respectively.

8. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The gearbox (1) is connected to an upper cover (11). The actuating assembly includes a wrench (9), a pin (10), and a torsion spring (3). One end of the wrench (9) is provided with a cam (4). The wrench (9) is connected to the upper cover (11) via the torsion spring (3). The pin (10) passes through the upper cover (11) and one end of it contacts the upper end of the locking rod (17), while the other end slides in contact with the cam (4). The surface of the cam (4) is configured to drive the pin (10) downward when the wrench (9) rotates in a first direction to compress the first elastic element (14). The torsion spring (3) is used to provide a force for the wrench (9) to rotate in a second direction opposite to the first direction.

9. The oscillating saw blade quick-clamping mechanism according to claim 1, characterized in that, The contact surface between the radial groove and the limiting member (7) is configured to have a force that drives the limiting member (7) to move radially when the locking rod (17) moves relative to the main shaft (13).

Images