Clamping and mounting mechanism for saw blade in electric swing saw for orthopedic surgery

Abstract

The invention discloses a clamping and mounting mechanism for a saw blade in an electric swing saw for orthopedic surgery, which comprises a front swing seat, a swing saw shaft mounted in the front swing seat, a lower clamping plate arranged at the upper end of the swing saw shaft, a pressing rod movably penetrating through the swing saw shaft, an upper clamping plate arranged at the upper end of the pressing rod, a base in threaded connection with the lower end of the front swing seat, and a tightening sleeve in threaded connection with the lower end of the pressing rod. A pressing sleeve is sleeved on the outer side of the tightening sleeve, an upper thrust washer is arranged on the top of the inner wall of the pressing sleeve, a lower thrust washer is arranged at the bottom of the outer wall of the tightening sleeve, a ball is arranged between the two thrust washers, a lower supporting cap is in threaded connection with an opening in the bottom of the pressing sleeve, guide blocks are respectively arranged on two sides of the pressing sleeve, two guide grooves are arranged in the base, and the nut sleeve is respectively in threaded connection with the two guide blocks. The lower end of the base is in threaded connection with a lower cap, a lower shifting ring is arranged on the lower portion of the outer wall of the nut sleeve, an upper shifting ring is arranged on the upper portion of the inner wall of the outer knob, and a torsional spring is arranged between the two shifting rings. And the clamping and mounting mechanism can reliably clamp the saw blade.

Description

Technical Field

[0001] The present invention relates to the field of power tools, and more particularly to a clamping and mounting mechanism for a saw blade in an orthopedic surgical power oscillating saw. Background Art

[0002] Orthopedic power oscillating saws are used in orthopedic and trauma surgeries, including artificial joint replacement, arthroscopic surgery, joint resection and reconstruction surgery, synovectomy, orthopedic plastic surgery, other joint surgeries, and tumor surgeries, etc. With a wide range of application scenarios and complex application methods, the performance and operation mode of the oscillating saw need to meet the requirements of various surgeries. Currently, the structure of the power oscillating saws on the market includes: a housing, a front swing seat is installed at the front end of the housing, an oscillating saw shaft is vertically installed in the front swing seat rotatably through a bearing, a lower clamping plate is arranged at the upper end of the oscillating saw shaft outside the front swing seat, a through hole vertically penetrating the oscillating saw shaft and the lower clamping plate is arranged in the oscillating saw shaft, a pressing rod is movably inserted into the through hole of the oscillating saw shaft, an upper clamping plate is arranged at the upper end of the pressing rod, the upper clamping plate is located above the lower clamping plate, several mounting bosses are arranged on the upper surface of the lower clamping plate, mounting holes corresponding to each mounting boss one by one are arranged at the rear end of the saw blade, the rear end of the saw blade is positioned by being inserted into each mounting hole through each mounting boss respectively, and then the pressing rod is driven to descend so that the upper clamping plate and the lower clamping plate clamp the rear end of the saw blade, so that the saw blade can be installed between the two clamping plates. At this time, after the oscillating saw shaft rotates back and forth under the drive of the motor in the housing, the saw blade can be driven to swing for sawing. Usually, the clamping force of the two clamping plates is provided by a spring. Due to the limited installation space, the spring cannot be made very large, which results in that the clamping force cannot be made large, and the force acting on the saw blade is easily greater than the spring force, causing the upper clamping plate to be easily pried up by the saw blade, thus resulting in the saw blade not being reliably clamped. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a clamping and mounting mechanism for a saw blade in an orthopedic surgical power oscillating saw that can reliably clamp the saw blade.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A clamping and mounting mechanism for a saw blade in an electric oscillating saw for orthopedic surgery, comprising: a front swing seat, the oscillating saw shaft is vertically and rotatably mounted in the front swing seat through a bearing, a lower clamping plate located outside the front swing seat is provided at the upper end of the oscillating saw shaft, a through hole vertically penetrating the oscillating saw shaft and the lower clamping plate is provided in the oscillating saw shaft, a pressure rod is movably inserted through the through hole of the oscillating saw shaft, an upper clamping plate is provided at the upper end of the pressure rod, and the upper clamping plate is located above the lower clamping plate. It is characterized in that: a base is threadedly connected to the lower end of the front swing seat, the lower end of the pressure rod extends into the base, a tightening sleeve is threadedly connected to the lower end of the pressure rod, a pressure sleeve is sleeved outside the tightening sleeve, an upper thrust washer is provided at the top of the inner wall of the pressure sleeve, a lower thrust washer is provided at the bottom of the outer wall of the tightening sleeve, and a ball is installed between the upper thrust washer and the lower thrust washer, so that when the pressure sleeve presses the tightening sleeve through the two thrust washers and the ball, it can prevent the tightening sleeve from rotating back and forth with the oscillating saw shaft. A lower retaining cap is threadedly connected to the bottom opening of the pressure sleeve. When the pressure sleeve moves upward, it can lift the tightening sleeve through the lower retaining cap. Guide blocks are respectively provided on both sides of the pressure sleeve, two guide grooves are provided in the base, the two guide blocks are respectively located in the two guide grooves and are respectively vertically guided by the corresponding guide grooves. A nut sleeve is sleeved outside the pressure sleeve and is respectively threadedly connected to the two guide blocks. An outer knob is rotatably sleeved outside the nut sleeve. A lower cover cap is threadedly connected to the lower end of the base, and the base and the lower cover cap can axially limit the outer knob and the nut sleeve. A lower dial ring is provided on the lower part of the outer wall of the nut sleeve, and an upper dial ring is provided on the upper part of the inner wall of the outer knob. An annular cavity is left between the upper dial ring and the lower dial ring, and a torsion spring is placed in the annular cavity. One end of the torsion spring is inserted into the upper dial ring, and the other end of the torsion spring is inserted into the lower dial ring, so that after the outer knob is driven to rotate by an external force, it can drive the nut sleeve to rotate through the torsion spring. After the nut sleeve rotates, it can drive the two guide blocks to drive the pressure sleeve and the lower retaining cap to move up and down. After the outer knob is driven to rotate forward by an external force, the pressure sleeve will descend, and the lower retaining cap will lift the tightening sleeve, the pressure rod, and the upper clamping plate to descend, so that the upper clamping plate and the lower clamping plate can clamp the rear end of the saw blade. Then, after the pressure sleeve continues to descend, it can press the tightening sleeve, so that the upper clamping plate and the lower clamping plate can clamp the rear end of the saw blade; after the outer knob is driven to rotate backward by an external force, the pressure sleeve will rise, and the lower retaining cap will lift the tightening sleeve, the pressure rod, and the upper clamping plate to rise, so that the upper clamping plate and the lower clamping plate can loosen the saw blade.

[0005] Further, in the above-mentioned clamping and mounting mechanism for a saw blade in an electric oscillating saw for orthopedic surgery: a locking elastic piece is further provided on the base, and the locking elastic piece is located above the nut sleeve. After the outer knob is driven to rotate forward by an external force until the two clamping plates are clamped, the locking elastic piece can prevent the nut sleeve from loosening by being deformed by being pressed by the nut sleeve, so that only by overcoming the frictional resistance with an external force can the nut sleeve be driven to rotate backward.

[0006] Further, in the clamping and installation mechanism of the saw blade in the above-mentioned electric oscillating saw for orthopedic surgery, specifically: There is also an annular tooth surface arranged above the outer knob on the base. Teeth are arranged on the lower surface of the annular tooth surface. A spring groove is arranged on the outer knob. A spring and a steel ball are placed in the spring groove. The steel ball abuts against the teeth on the annular tooth surface under the pushing of the spring. When the outer knob rotates, the steel ball will always abut against the teeth on the annular tooth surface and move along the annular tooth surface. After the steel ball abuts against the teeth, a rotational resistance can be applied to the outer knob, so that the outer knob cannot rotate freely without external force.

[0007] Further, in the clamping and installation mechanism of the saw blade in the above-mentioned electric oscillating saw for orthopedic surgery, specifically: The opposite end faces of the upper thrust washer and the lower thrust washer are respectively arranged as spherical arc surfaces that can cooperate with the ball bearings.

[0008] Further, in the clamping and installation mechanism of the saw blade in the above-mentioned electric oscillating saw for orthopedic surgery, specifically: A fixing screw for screwing in the lower end of the tightening rod is screwed into the tightening sleeve.

[0009] Further, in the clamping and installation mechanism of the saw blade in the above-mentioned electric oscillating saw for orthopedic surgery, specifically: A lock screw for screwing in the lower end of the base is screwed into the lower cap.

[0010] Further, in the clamping and installation mechanism of the saw blade in the above-mentioned electric oscillating saw for orthopedic surgery, specifically: Several installation bosses are arranged on the upper surface of the lower clamping plate. Installation holes corresponding to each installation boss one by one are arranged on the rear end of the saw blade. The rear end of the saw blade can be inserted into each installation hole through each installation boss for positioning. A circular groove for avoiding each installation boss is arranged on the lower end surface of the upper clamping plate. The circular groove does not prevent the upper clamping plate from pressing the saw blade. The cross-section of the installation boss is in a tapered shape with a wider lower part and a narrower upper part, so that the installation holes on the saw blade can still be tightly matched with the installation bosses after wear and expansion.

[0011] The advantages of the present invention are as follows: The clamping and installation mechanism drives the nut sleeve to rotate through the outer knob. After the nut sleeve rotates, it drives the pressure sleeve to press the tightening sleeve. A ball bearing is installed between the pressure sleeve and the tightening sleeve. Therefore, when the pressure sleeve presses, it will not affect the operation of the saw blade. After the pressure sleeve presses the tightening sleeve and the tightening rod, it can only be decompressed by driving the outer knob to rotate the nut sleeve. Therefore, without external force driving the outer knob to rotate, the upper clamping plate cannot be pried up by applying external force to the saw blade. Thus, the clamping and installation mechanism can reliably clamp the saw blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the clamping and installation mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to the present invention.

[0013] Figure 2 is Figure 1 a schematic structural diagram of the base in

[0014] Figure 3 is Figure 1 The structural schematic diagram of the middle tension sleeve.

[0015] Figure 4 is Figure 1 The structural schematic diagram of the middle pressure sleeve.

[0016] Figure 5 is Figure 1 The structural schematic diagram of the middle nut sleeve.

[0017] Figure 6 is Figure 1 The structural schematic diagram of the outer knob. Specific embodiments

[0018] The present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0019] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6As shown in the figure, the clamping and installation mechanism of the saw blade in the electric oscillating saw for orthopedic surgery includes: a front swing seat 1, a swing saw shaft 2 is vertically installed in the front swing seat 1 rotatably through a bearing, a lower clamping plate 3 located outside the front swing seat 1 is arranged at the upper end of the swing saw shaft 2, a through hole vertically penetrating the swing saw shaft 2 and the lower clamping plate 3 is arranged in the swing saw shaft 2, a pressure rod 4 is movably inserted into the through hole of the swing saw shaft 2, an upper clamping plate 5 is arranged at the upper end of the pressure rod 4, the upper clamping plate 5 is located above the lower clamping plate 3, a base 6 is threadedly connected to the lower end of the front swing seat 1, the lower end of the pressure rod 4 extends into the base 6, a tightening sleeve 7 is threadedly connected to the lower end of the pressure rod 4, a pressure sleeve 8 is sleeved outside the tightening sleeve 7, an upper thrust washer 9 is arranged at the top of the inner wall of the pressure sleeve 8, a lower thrust washer 10 is arranged at the bottom of the outer wall of the tightening sleeve 7, a ball 11 is installed between the upper thrust washer 9 and the lower thrust washer 10, so that when the pressure sleeve 8 presses the tightening sleeve 7 through the two thrust washers and the ball 11, it can prevent the tightening sleeve 7 from rotating back and forth along with the swing saw shaft 2. A lower retaining cap 12 is threadedly connected to the bottom opening of the pressure sleeve 8, and when the pressure sleeve 8 moves upward, it can lift the tightening sleeve 7 through the lower retaining cap 12. Guide blocks 13 are respectively arranged on both sides of the pressure sleeve 8, two guide grooves 14 are arranged in the base 6, the two guide blocks 13 are respectively located in the two guide grooves 14 and are respectively vertically guided by the corresponding guide grooves 14. A nut sleeve 15 is sleeved outside the pressure sleeve 8 and is respectively threadedly connected to the two guide blocks 13. An outer knob 16 is rotatably sleeved outside the nut sleeve 15. A lower cap 17 is threadedly connected to the lower end of the base 6, and the base 6 and the lower cap 17 can axially limit the outer knob 16 and the nut sleeve 15. A lower dial ring 18 is arranged on the lower part of the outer wall of the nut sleeve 15, an upper dial ring 19 is arranged on the upper part of the inner wall of the outer knob 16, an annular cavity is left between the upper dial ring 19 and the lower dial ring 18, a torsion spring 20 is placed in the annular cavity, one end of the torsion spring 20 is inserted into the upper dial ring 19, and the other end of the torsion spring 20 is inserted into the lower dial ring 18, so that after the outer knob 16 is driven to rotate by an external force, it can drive the nut sleeve 15 to rotate through the torsion spring 20. After the nut sleeve 15 rotates, it can drive the two guide blocks 13 to move the pressure sleeve 8 and the lower retaining cap 12 up and down. After the outer knob 16 is driven to rotate forward by an external force, the pressure sleeve 8 will descend, and the lower retaining cap 12 will support the tightening sleeve 7, the pressure rod 4, and the upper clamping plate 5 to descend, so that the upper clamping plate 5 and the lower clamping plate 3 can clamp the rear end of the saw blade 28. Then, after the pressure sleeve 8 continues to descend, it can press the tightening sleeve 7, so that the upper clamping plate 5 and the lower clamping plate 3 can clamp the rear end of the saw blade 28 tightly; after the outer knob 16 is driven to rotate reversely by an external force, the pressure sleeve 8 will rise, and the lower retaining cap 12 will support the tightening sleeve 7, the pressure rod 4, and the upper clamping plate 5 to rise, so that the upper clamping plate 5 and the lower clamping plate 3 can loosen the saw blade 28.

[0020] Above the nut sleeve 15 is blocked and limited, so that after the nut sleeve 15 rotates, it can drive the pressure sleeve 8 to move downward to tightly press the tension sleeve 7. After the two clamping plates clamp the saw blade, the top of the nut sleeve 15 will be limited and clamped under the action of the reaction force. In order to prevent the outer knob 16 from being lifted by the nut sleeve 15 and abutting against the base 6 and getting stuck, the outer knob 16 and the nut sleeve 15 are not directly fixedly driven, but a torsion spring 20 is used for transmission. In this way, after the nut sleeve 15 is limited and clamped, the outer knob 16 can still rotate normally.

[0021] In this embodiment, a locking spring piece 21 is further arranged on the base 6. The locking spring piece 21 is located above the nut sleeve 15. After the outer knob 16 is driven to rotate forward by an external force until the two clamping plates are clamped, the locking spring piece 21 can prevent the nut sleeve 15 from loosening by being pressed and deformed by the nut sleeve 15, so that only by overcoming the frictional resistance by an external force can the nut sleeve 15 be driven to rotate reversely. After such a setting, the influence of the working vibration of the electric swing saw on the nut sleeve 15 can be effectively reduced.

[0022] An annular tooth surface 22 is further arranged on the base 6 above the outer knob 16. Teeth are arranged on the lower surface of the annular tooth surface 22. A spring groove 23 is arranged on the outer knob 16. A spring and a steel ball 25 are placed in the spring groove 23. The steel ball 25 abuts against the teeth on the annular tooth surface 22 under the pushing of the spring. When the outer knob 16 rotates, the steel ball 25 will always abut against the teeth on the annular tooth surface 22 and move along the annular tooth surface 22. After the steel ball 25 abuts against the teeth, a rotational resistance can be applied to the outer knob 16, so that the outer knob 16 cannot rotate freely without an external force.

[0023] The opposite end faces of the upper thrust washer 9 and the lower thrust washer 10 are respectively arranged as spherical arc surfaces that can cooperate with the ball 11. After such a setting, the rotation can be made smoother.

[0024] A fixing screw 26 for screwing the lower end of the top pressing rod 4 is screwed into the tension sleeve 7. A locking screw 27 for screwing the lower end of the base 6 is screwed into the lower cap 17. Such a setting is to lock the tension sleeve 7 and the lower cap 17 so that they will not loosen during work.

[0025] Several mounting bosses 24 are arranged on the upper surface of the lower clamping plate 3. Mounting holes corresponding to the respective mounting bosses 24 are arranged at the rear end of the saw blade 28. The rear end of the saw blade 28 can be respectively inserted into the respective mounting holes through the respective mounting bosses 24 for positioning. A circular groove 29 for avoiding the respective mounting bosses 24 is arranged on the lower end surface of the upper clamping plate 5. The circular groove 29 does not prevent the upper clamping plate 5 from pressing the saw blade 28. The cross section of the mounting boss 24 is a cone with a wider lower part and a narrower upper part, so that the mounting holes on the saw blade 28 can still be tightly fitted with the mounting bosses 24 after being worn and enlarged.

Claims

1. A clamping and installation mechanism for a saw blade in an electric oscillating saw for orthopedic surgery, comprising: Front swing seat, the swing saw shaft is vertically installed in the front swing seat rotatably through bearings. A lower clamping plate located outside the front swing seat is provided at the upper end of the swing saw shaft. A through hole vertically penetrating the swing saw shaft and the lower clamping plate is provided in the swing saw shaft. A pressure rod is movably inserted into the through hole of the swing saw shaft. An upper clamping plate is provided at the upper end of the pressure rod. The upper clamping plate is located above the lower clamping plate. It is characterized in that: a base is threadedly connected to the lower end of the front swing seat. The lower end of the pressure rod extends into the base. A tightening sleeve is threadedly connected to the lower end of the pressure rod. A pressure sleeve is sleeved outside the tightening sleeve. An upper thrust washer is provided on the inner wall top of the pressure sleeve. A lower thrust washer is provided on the outer wall bottom of the tightening sleeve. A ball is installed between the upper thrust washer and the lower thrust washer, so that when the pressure sleeve presses the tightening sleeve through the two thrust washers and the ball, it can prevent the tightening sleeve from rotating back and forth with the swing saw shaft. A lower support cap is threadedly connected to the bottom opening of the pressure sleeve. When the pressure sleeve moves upward, it can lift the tightening sleeve through the lower support cap. Guide blocks are respectively provided on both sides of the pressure sleeve. Two guide grooves are provided in the base. The two guide blocks are respectively located in the two guide grooves and are respectively vertically guided by the corresponding guide grooves. A nut sleeve is sleeved outside the pressure sleeve and is respectively threadedly connected to the two guide blocks. An outer knob is rotatably sleeved outside the nut sleeve. A lower cover cap is threadedly connected to the lower end of the base. The base and the lower cover cap can axially limit the outer knob and the nut sleeve. A lower dial ring is provided on the outer wall lower part of the nut sleeve. An upper dial ring is provided on the inner wall upper part of the outer knob. An annular cavity is left between the upper dial ring and the lower dial ring. A torsion spring is placed in the annular cavity. One end of the torsion spring is inserted into the upper dial ring. The other end of the torsion spring is inserted into the lower dial ring, so that after the outer knob is driven to rotate by an external force, it can drive the nut sleeve to rotate through the torsion spring. After the nut sleeve rotates, it can drive the two guide blocks to drive the pressure sleeve and the lower support cap to move up and down. After the outer knob is driven to rotate forward by an external force, the pressure sleeve will descend, and the lower support cap will support the tightening sleeve, the pressure rod, and the upper clamping plate to descend, so that the upper clamping plate can clamp the rear end of the saw blade with the lower clamping plate. Then, after the pressure sleeve continues to descend, it can press the tightening sleeve, so that the upper clamping plate and the lower clamping plate can clamp the rear end of the saw blade; after the outer knob is driven to rotate backward by an external force, the pressure sleeve will rise, and the lower support cap will support the tightening sleeve, the pressure rod, and the upper clamping plate to rise, so that the upper clamping plate and the lower clamping plate can loosen the saw blade.

2. The clamping and installation mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1, characterized in that: A locking elastic piece is also provided on the base. The locking elastic piece is located above the nut sleeve. After the outer knob is driven to rotate forward by an external force until the two clamping plates are clamped, the locking elastic piece can prevent the nut sleeve from loosening by being deformed by being pressed by the nut sleeve, so that only by overcoming the frictional resistance by an external force can the nut sleeve be driven to rotate backward.

3. The clamping and mounting mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: An annular tooth surface is also provided on the base. The annular tooth surface is located above the outer knob. Teeth are provided on the lower surface of the annular tooth surface. A spring groove is provided on the outer knob. A spring and a steel ball are placed in the spring groove. The steel ball abuts against the teeth on the annular tooth surface under the pushing of the spring. When the outer knob rotates, the steel ball will always abut against the teeth on the annular tooth surface and move along the annular tooth surface. After the steel ball abuts against the teeth, it can apply a rotational resistance to the outer knob, so that the outer knob cannot freely rotate without an external force.

4. The clamping and mounting mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: The opposite end faces of the upper thrust washer and the lower thrust washer are respectively arranged as spherical arc surfaces capable of cooperating with the ball bearings.

5. The clamping and mounting mechanism for the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: A fixing screw for tightening the lower end of the pressing rod is screwed into the tension sleeve.

6. The clamping and mounting mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: A lock screw for tightening the lower end of the base is screwed into the lower cap.

7. The clamping and mounting mechanism of the saw blade in the electric oscillating saw for orthopedic surgery according to claim 1 or 2, characterized in that: Several mounting bosses are arranged on the upper surface of the lower clamping plate. Mounting holes corresponding to each mounting boss one by one are arranged at the rear end of the saw blade. The rear end of the saw blade can be respectively inserted into each mounting hole through each mounting boss for positioning. A circular groove for avoiding each mounting boss is arranged on the lower end surface of the upper clamping plate. The circular groove does not prevent the upper clamping plate from pressing the saw blade. The cross section of the mounting boss is in a tapered shape with a wider lower part and a narrower upper part, so that the mounting holes on the saw blade can still be tightly fitted with the mounting bosses after being worn and enlarged.

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