Quick-release mechanism of the saw blade in an electric oscillating saw for orthopedic surgery

Abstract

This utility model discloses a quick-release mechanism for the saw blade in an electric oscillating saw for orthopedic surgery, comprising: a head shell; a lower clamping plate on the oscillating saw shaft; a pressure rod passing through the oscillating saw shaft; an upper clamping plate on the pressure rod; a spring cap threaded on the lower end of the pressure rod; a spring step in the lower port of the oscillating saw shaft; pressing the spring against the spring step to push the spring cap; a sliding groove cover threaded on the lower end of the head shell; a knob fitted on the outer side of the sliding groove cover; a slider installed in the sliding groove cover; an annular groove on the side wall of the slider; spiral channels on both sides of the side wall of the sliding groove cover; upper holes on the upper ends of the two spiral channels; vertical drive grooves on both sides of the inner side wall of the knob; and two lifting steel balls located in the two spiral channels, the two vertical drive grooves, and the annular groove, respectively. The aforementioned quick-release mechanism for the saw blade has a simple structure, few parts, and is easy to assemble, thereby greatly reducing the manufacturing cost of the electric oscillating saw.

Description

Technical Field

[0001] This utility model relates to the field of power tools, specifically to a quick-release mechanism for the saw blade in an electric oscillating saw used in orthopedic surgery. Background Technology

[0002] Orthopedic electric oscillating saws are used in orthopedic and trauma surgery, including artificial joint replacement, arthroscopic surgery, joint resection and reconstruction, synovectomy, orthopedic plastic surgery, other joint surgeries, and tumor surgery. They have a wide range of applications and complex operating methods, and the performance and operation of the oscillating saw need to meet the requirements of various surgeries. Currently, the quick-release mechanism of the saw blade in commercially available electric oscillating saws is relatively complex, resulting in numerous parts and cumbersome assembly, thus leading to higher manufacturing costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a saw blade quick-assembly mechanism with simple structure, few parts, and easy assembly.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a quick-release mechanism for the saw blade in an electric oscillating saw for orthopedic surgery, comprising: a head shell, in which the oscillating saw shaft is rotatably and vertically installed via bearings; characterized in that: a lower clamping plate is provided on the upper end of the oscillating saw shaft located outside the head shell; a through hole is provided in the oscillating saw shaft and the lower clamping plate; a pressure rod is movably inserted through the through hole of the oscillating saw shaft; an upper clamping plate is provided on the upper end of the pressure rod, the upper clamping plate being located above the lower clamping plate; a spring pressure cap is threadedly connected to the lower end of the pressure rod; a spring step is provided in the lower port of the oscillating saw shaft; a pressing spring is fitted on the pressure rod between the spring step and the spring pressure cap; the pressing spring... The spring pushes the spring cap downward against the spring step, allowing the saw blade to be clamped between the upper and lower clamping plates and mounted on the end of the swing saw shaft. A circular slide cover, covering the lower end of the pressure rod, is threaded onto the lower end of the headstock. A knob that can rotate left and right is fitted onto the outer side of the slide cover. A circular slider that can slide up and down is installed in the slide cover, located below the spring cap. An annular groove is provided on the side wall of the slider. A spiral channel is provided on each side of the side wall of the slide cover, with an upper hole at the upper end of each spiral channel. A vertical drive groove is provided on each side of the inner side wall of the knob. [Further details about the knob are needed for a complete translation.] Two lifting steel balls of equal height are positioned such that their middle portions are located in two spiral channels, their outer portions in two vertical drive slots, and their interiors in annular grooves. When the manual drive knob is rotated clockwise in the unlocking direction, the knob rotates along with the two lifting steel balls via the two vertical drive slots. These slots vertically guide the steel balls, allowing them to be simultaneously lifted by their respective spiral channels. As the steel balls rotate along the annular grooves while being lifted, the slider rises under their influence, overcoming [the obstacle / challenge]. Pressing the spring lifts the pressure rod, allowing the upper clamping plate to rise and open with the lower clamping plate. The two lifting steel balls are then driven to move simultaneously into the upper holes of their respective spiral channels. At this point, the two lifting steel balls are pressed and positioned in their respective upper holes, ensuring that the upper and lower clamping plates remain open even after the external force on the knob is removed, allowing for saw blade installation. When the manual drive knob is rotated in the opposite direction to the locking position, the two lifting steel balls simultaneously leave their respective upper holes under the action of external force. At this point, the two lifting steel balls descend along their respective spiral channels, and the slider also descends accordingly. The upper clamping plate is then reset and clamped with the lower clamping plate under the action of the pressing spring.

[0005] Furthermore, in the aforementioned electric oscillating saw for orthopedic surgery, the saw blade quick-release mechanism includes: an anti-loosening spring placed between the slider and the bottom of the slide cover; and lower holes provided at the lower ends of the two spiral channels. When the manual drive knob is rotated in the opposite direction to the locking direction, the two lifting steel balls can be driven to move simultaneously into the lower holes of their respective spiral channels. At this time, the slider can press the anti-loosening spring, and under the action of the anti-loosening spring, the two lifting steel balls can be pushed and positioned in their respective lower holes, so that the knob can be positioned after the external force on the knob disappears.

[0006] Furthermore, in the aforementioned electric oscillating saw for orthopedic surgery, the quick-release mechanism for the saw blade includes: several mounting bosses on the upper surface of the lower clamping plate; mounting holes and clearance notches corresponding to each mounting boss on the rear end of the saw blade; the mounting bosses are evenly distributed around the center of the lower clamping plate; when the rear end of the saw blade is placed between the two clamping plates, it can avoid the pressure rod through the clearance notches; the rear end of the saw blade can be positioned by inserting into each mounting hole through each mounting boss; each mounting boss is elongated; each mounting hole is large at both ends and narrow in the middle; the middle of each mounting hole is used for tight fitting and positioning with the sides of the mounting boss.

[0007] Furthermore, in the aforementioned electric oscillating saw for orthopedic surgery, the saw blade quick-release mechanism includes: a circular groove on the lower end face of the upper clamping plate to avoid various mounting bosses; the circular groove does not prevent the upper clamping plate from pressing the saw blade; the cross-section of the mounting boss is a tapered shape that is wider at the bottom and narrower at the top, so that even after the mounting holes on the saw blade are worn and enlarged, they can still fit tightly with the mounting boss.

[0008] Furthermore, in the aforementioned electric oscillating saw for orthopedic surgery, the saw blade quick-release mechanism includes: an annular mounting groove on the slide cover; mounting screws that can be screwed into the annular mounting groove are threaded onto both sides of the knob; and the knob can be rotatably mounted on the slide cover by the two mounting screws engaging with the annular mounting groove.

[0009] The advantages of this utility model are: the saw blade quick-assembly mechanism has a simple structure, few parts, and easy assembly, which can greatly simplify the assembly time of the electric oscillating saw and thus greatly reduce the manufacturing cost of the electric oscillating saw; in addition, the saw blade can be reliably installed after it is matched with the mounting hole and the mounting boss and clamped by the two clamping plates. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the saw blade quick-assembly mechanism described in this utility model.

[0011] Figure 2 This is a three-dimensional structural diagram of the saw blade quick-release mechanism of this utility model after removing the knob.

[0012] Figure 3 for Figure 1 A cross-sectional structural diagram.

[0013] Figure 4 This is a schematic diagram of the oscillating saw shaft.

[0014] Figure 5 This is a schematic diagram of the compression bar.

[0015] Figure 6 This is a schematic diagram of the slide cover.

[0016] Figure 7 This is a schematic diagram of the knob.

[0017] Figure 8 This is a schematic diagram of the saw blade. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the quick-release mechanism of the saw blade in an electric oscillating saw for orthopedic surgery includes: a head shell 1; an oscillating saw shaft 2 rotatably mounted vertically in the head shell 1 via bearings; a lower clamping plate 3 located on the outer side of the head shell 1 is provided on the upper end of the oscillating saw shaft 2; a through hole is provided in the oscillating saw shaft 2, vertically penetrating the oscillating saw shaft 2 and the lower clamping plate 3; a pressure rod 4 is movably inserted through the through hole of the oscillating saw shaft 2; an upper clamping plate 5 is provided on the upper end of the pressure rod 4, located above the lower clamping plate 3; a spring pressure cap 6 is threadedly connected to the lower end of the pressure rod 4; a spring step 7 is provided in the lower port of the oscillating saw shaft 2; a pressing spring 8 is fitted on the pressure rod 4 between the spring step 7 and the spring pressure cap 6; the pressing spring 8 pushes the spring pressure cap 6 downward against the spring step 7, allowing the saw blade 9 to pass through. The rear end is clamped between the upper clamping plate 5 and the lower clamping plate 3 and installed on the end of the swing saw shaft 2. A circular slide cover 10 is threaded onto the lower end of the head shell 1, covering the outer side of the lower end of the pressure rod 4. A knob 11 that can rotate left and right is fitted on the outer side of the slide cover 10. A circular slider 12 that can slide up and down is installed in the slide cover 10. The slider 12 is located below the spring cap 6. An annular groove 13 is provided on the side wall of the slider 12. A spiral channel 14 is provided on each side of the side wall of the slide cover 10. An upper end hole 15 is provided on the upper end of each of the two spiral channels 14. A vertical drive groove 16 is provided on each side of the inner side wall of the knob 11. Two lifting steel balls 17 of equal height are also provided. The middle part of the two lifting steel balls 17 is located in two spiral channels 14, the outer parts of the two lifting steel balls 17 are located in two vertical drive grooves 16, and the inner parts of the two lifting steel balls 17 are located in annular grooves 13. When the manual drive knob 11 is rotated in the unlocking direction, the knob 11 can rotate together with the two lifting steel balls 17 through the two vertical drive grooves 16. At this time, the two vertical drive grooves 16 can vertically avoid the two lifting steel balls 17, so that the two lifting steel balls 17 can be lifted simultaneously under the drive of their respective spiral channels 14. Since the two lifting steel balls 17 can rotate along the annular grooves 13 while being lifted, the slider 12 can rise under the drive of the two lifting steel balls 17 and overcome the elastic force of the pressing spring 8. Raise the pressure bar 4 so that the upper clamping plate 5 can rise and open with the lower clamping plate 3. The two lifting steel balls 17 can be driven to move simultaneously into the upper end hole 15 of the spiral channel 14. At this time, the two lifting steel balls 17 can be pressed and positioned in their respective upper end holes 15, so that the upper clamping plate 5 and the lower clamping plate 3 can remain open after the external force on the knob 11 is removed, so as to install the saw blade 9. After manually driving the knob 11 to rotate in the opposite direction of locking, the two lifting steel balls 17 can leave their respective upper end holes 15 under the action of external force. At this time, the two lifting steel balls 17 will descend along their respective spiral channels 14, and the slider 12 will also descend. The upper clamping plate 5 will be reset and clamped with the lower clamping plate 3 under the action of the pressing spring 8.

[0020] In this embodiment, an anti-loosening spring 18 is placed between the bottom of the slider 12 and the slide cover 10. The lower ends of the two spiral channels 14 are respectively provided with lower end holes 19. After the manual drive knob 11 is rotated in the opposite direction to the locking direction, the two lifting steel balls 17 can be driven to move simultaneously into the lower end holes 19 of their respective spiral channels 14. At this time, the slider 12 can press the anti-loosening spring 18. Under the action of the anti-loosening spring 18, the two lifting steel balls 17 can be pushed and positioned in their respective lower end holes 19, so that after the external force on the knob 11 disappears, the knob 11 can be positioned. With this configuration, when the oscillating saw drives the saw blade to cut, the knob 11 can be positioned and will not rotate freely.

[0021] like Figure 8 As shown, seven mounting bosses 20 are provided on the upper surface of the lower clamping plate 3. The rear end of the saw blade 9 has mounting holes 21 and clearance notches 22 corresponding to each mounting boss 20. The mounting bosses 20 are evenly distributed around the center of the lower clamping plate 3. When the rear end of the saw blade 9 is placed between the two clamping plates, it can avoid the pressure rod 4 through the clearance notches 22. The rear end of the saw blade 9 can be positioned by inserting each mounting boss 20 into each mounting hole 21. Each mounting boss 20 is elongated, and each mounting hole 21 is wider at both ends and narrower in the middle. The middle of each mounting hole 21 is used for tight fitting and positioning with the sides of the mounting boss 20. The wider ends and narrower middle of each mounting hole 21 make it easier and faster to insert the mounting bosses 20 into the mounting holes 21, thus making the installation of the saw blade more convenient.

[0022] A circular groove 23 is provided on the lower end face of the upper clamping plate 5 to avoid the mounting bosses 20. The circular groove 23 does not hinder the upper clamping plate 5 from pressing the saw blade 9. The cross-section of the mounting bosses 20 is tapered, wider at the bottom and narrower at the top, so that even after the mounting holes 21 on the saw blade 9 wear and expand, they can still fit tightly with the mounting bosses 20. When the mounting holes 21 are not worn, the saw blade 9 does not contact the lower clamping plate 3 after installation. As the mounting holes 21 wear and expand, the saw blade 9 will gradually move down after installation until it contacts the lower clamping plate 3. This design can greatly extend the service life of the saw blade 9, so that the saw blade 9 will not be immediately scrapped due to minor wear of the mounting holes 21.

[0023] An annular mounting groove 24 is provided on the slide cover 10. Mounting screws that can be screwed into the annular mounting groove 24 are threaded on both sides of the knob 11. The knob 11 can be rotatably mounted on the slide cover 10 by cooperating with the annular mounting groove 24 through the two mounting screws. This arrangement facilitates the installation of the knob 11.

Claims

1. The quick-release mechanism for the saw blade in an electric oscillating saw used in orthopedic surgery, including: The head shell and the oscillating saw shaft are rotatably and vertically mounted in the head shell via bearings. The head shell features a lower clamping plate located on the outer side of the head shell at the upper end of the oscillating saw shaft. A through hole vertically passes through the oscillating saw shaft and the lower clamping plate. A pressure rod movably passes through the through hole of the oscillating saw shaft. An upper clamping plate is located on the upper end of the pressure rod, positioned above the lower clamping plate. A spring pressure cap is threaded onto the lower end of the pressure rod. A spring step is located at the lower end of the oscillating saw shaft. A pressing spring is fitted onto the pressure rod between the spring step and the spring pressure cap. The pressing spring pushes the spring pressure cap downwards against the spring step, allowing the saw blade to be clamped at its rear end. The saw is mounted on the end of the swing saw shaft between the clamping plate and the lower clamping plate. A circular slide cover, which covers the outer side of the lower end of the pressure rod, is threaded onto the lower end of the head shell. A knob that can rotate left and right is fitted onto the outer side of the slide cover. A circular slider that can slide up and down is installed in the slide cover. The slider is located below the spring pressure cap. An annular groove is arranged around the slider on its side wall. A spiral channel is provided on each side of the side wall of the slide cover, and an upper hole is provided at the upper end of each spiral channel. A vertical drive groove is provided on each side of the inner side wall of the knob. Two lifting steel balls of equal height are also provided, with their middle portions respectively... Located within two spiral channels, the outer portions of the two lifting steel balls are situated in two vertical drive slots, while their interiors are located in annular grooves. When the manual drive knob is rotated clockwise in the unlocking direction, the knob rotates along with the two lifting steel balls via the two vertical drive slots. At this time, the two vertical drive slots vertically avoid the two lifting steel balls, allowing them to be simultaneously lifted under the drive of their respective spiral channels. Because the two lifting steel balls rotate along the annular grooves while being lifted, the slider rises under the drive of the two lifting steel balls, overcoming the spring force of the pressing spring to lift the pressure rod. This allows the upper clamping plate to rise and open with the lower clamping plate, driving the two lifting steel balls to move simultaneously into the upper holes of their respective spiral channels. At this point, the two lifting steel balls are pressed and positioned in their respective upper holes, ensuring that the upper and lower clamping plates remain open for saw blade installation even after the external force on the knob is removed. When the manual drive knob is rotated in the opposite direction to the locking position, the two lifting steel balls simultaneously leave their respective upper holes under the action of external force. At this point, the two lifting steel balls descend along their respective spiral channels, and the slider also descends accordingly. The upper clamping plate resets under the action of the pressing spring and clamps with the lower clamping plate.

2. The quick-release mechanism for the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1, characterized in that: An anti-loosening spring is placed between the slider and the bottom of the slide cover. The lower ends of the two spiral channels are respectively provided with lower end holes. After the manual drive knob is rotated in the opposite direction of locking, the two lifting steel balls can be driven to move simultaneously into the lower end holes of their respective spiral channels. At this time, the slider can press the anti-loosening spring. Under the action of the anti-loosening spring, the two lifting steel balls can be pushed and positioned in their respective lower end holes, so that the knob can be positioned after the external force on the knob disappears.

3. The quick-release mechanism for the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: Several mounting bosses are provided on the upper surface of the lower clamping plate. The rear end of the saw blade is provided with mounting holes and clearance notches that correspond one-to-one with each mounting boss. The mounting bosses are evenly distributed around the center of the lower clamping plate. When the rear end of the saw blade is placed between the two clamping plates, it can avoid the pressure bar through the clearance notches. The rear end of the saw blade can be positioned by inserting into each mounting hole through each mounting boss. Each mounting boss is elongated, and each mounting hole is large at both ends and narrow in the middle. The middle part of each mounting hole is used to fit tightly with the two sides of the mounting boss for positioning.

4. The quick-release mechanism for the saw blade in the electric oscillating saw for orthopedic surgery according to claim 3, characterized in that: A circular groove is provided on the lower end face of the upper clamping plate to avoid the various mounting bosses. The circular groove does not prevent the upper clamping plate from pressing the saw blade. The cross-section of the mounting boss is a cone shape that is wider at the bottom and narrower at the top, so that the mounting holes on the saw blade can still fit tightly with the mounting boss even after wear and expansion.

5. The quick-release mechanism for the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: An annular mounting groove is provided on the slide cover. On both sides of the knob, there are mounting screws that can be screwed into the annular mounting groove. The knob can be rotatably mounted on the slide cover by the two mounting screws cooperating with the annular mounting groove.

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