Rocker arm locking structure of pull rod miter saw

Abstract

The rocker arm locking structure of the pull rod miter saw comprises a base, a rotating disc is formed on one side of the base, a fixing block is fixed in the rotating disc, and a locking plate is fixed to the outer end of the fixing block; the rocker arm is rotatably arranged on the rotating disc, a locking assembly is arranged on the rocker arm, the locking assembly comprises a locking shaft, the locking shaft is horizontally and transversely arranged and rotatably arranged on the rocker arm, a locking wrench used for operating rotation is fixed to the end of the locking shaft, and a concave part and a convex part are formed on the locking shaft; the main body of the rotating block is in an L shape, the rotating block is hinged to the rocker arm, an L-shaped contact plate which is bent downwards is formed in the middle of the rotating block, the contact plate is located above the lock shaft and half wraps the lock shaft, two positioning columns are formed on the rotating block below the contact plate, an elastic piece plate and a spring plate are limited in the positioning columns, and the elastic piece plate and the spring plate are arranged on the rotating block. And the elastic sheet plate and the spring plate are limited between the rotating block and the locking plate.

Description

A rocker arm locking structure for a pull rod bevel saw Technical Field

[0001] This application relates to the field of oblique cutting saw technology, and in particular to a rocker arm locking structure for a lever oblique cutting saw. Background Technology

[0002] The lever-operated miter saw is a processing tool widely used in wood processing, metal cutting and other fields. The traditional way to operate a miter saw is to loosen the rocker arm locking mechanism, turn the operating handle to rotate the rocker arm to the required angle, and then lock the rocker arm. This operation is complicated, the operating range is too large, and the work efficiency is low.

[0003] Existing beveling saws with more convenient self-locking rocker arm functions, such as the beveling saw with a self-locking function disclosed in Chinese Patent Publication No. CN214721086U, utilize the self-locking characteristics of a worm gear. When the worm rotates to drive the worm wheel, due to the design of the tooth profile and friction angle of the worm gear, the worm wheel has a self-locking capability, which can lock the rocker arm at any position without additional locking action, achieving certain technical effects. However, during its operation and transmission, its stroke involves the rocker arm angle control handle, transmission mechanism, worm, and worm wheel to finally achieve the rocker arm angle adjustment. The transmission stroke is relatively long, there are many parts, and the structure is relatively complex. In addition, the rocker arm angle control handle is positioned low, making operation inconvenient.

[0004] Based on this, this application aims to achieve the angle adjustment and locking of the rocker arm using a method different from the aforementioned patents, and also overcomes the above-mentioned defects.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0006] Based on this, this application provides a rocker arm locking structure for a tie rod oblique cut saw to solve one of the above-mentioned technical problems.

[0007] The technical solution adopted by this application to solve its technical problem is: a rocker arm locking structure for a pull rod oblique cut saw, comprising: a base, a turntable formed on one side of the base, a fixing block fixed inside the turntable, and a locking plate fixed at the outer end of the fixing block; a rocker arm, rotating on the turntable, and a locking assembly provided on the rocker arm, the locking assembly comprising: a locking shaft, horizontally arranged and rotating on the rocker arm, with a locking wrench fixed at its end for operating the rotation, and a recess and a protrusion formed on the locking shaft; and a rotating block, the main body of which is L-shaped and hinged to the rocker arm. On the arm, an L-shaped downward-bent contact plate is formed in the middle. The contact plate is located above the locking shaft and partially encloses the locking shaft. Two positioning posts are formed on the rotating block below the contact plate. A spring plate and a spring plate are limited inside the positioning posts. The spring plate and spring plate are restricted between the rotating block and the locking plate. When the concave part contacts the contact plate, the rotating block is not subjected to force. When the convex part contacts the contact plate, the contact plate is lifted, and the rotating block drives the spring plate to press the locking plate, thereby locking the rocker arm.

[0008] In some embodiments, both the spring plate and the spring plate are provided with positioning grooves that match the positioning post, and the spring plate and the spring plate are limited on the rotating block by the cooperation of the positioning grooves and the positioning post.

[0009] In some embodiments, the spring plate is disposed between the spring plate and the rotating block, and an adjusting bolt is screwed onto the rotating block, the adjusting bolt passing through the rotating block and abutting against the spring plate.

[0010] In some embodiments, the spring plate has a mounting groove on one side and two protrusions on the other side. The protrusions contact the spring plate. A friction-enhancing plate with an outer contour consistent with the mounting groove is provided in the mounting groove. The friction-enhancing plate protrudes slightly from the outer surface of the rotating block. Furthermore, the friction-enhancing plate is constrained between the mounting groove and the locking plate.

[0011] In some embodiments, the edge of the locking plate extends toward the rotating block with an arc-shaped protrusion, and the spring plate above the mounting groove has an opening groove with an arc-shaped wall. When the spring plate abuts against the locking plate, the protrusion is placed in the opening groove.

[0012] In some embodiments, a support column is formed inside the rocker arm, and the support column is directly opposite the spring plate and the friction-increasing block.

[0013] In some embodiments, a limiting block and a limiting groove are formed on the locking wrench, and two positioning blocks are formed on the rocker arm. The positioning blocks are used to cooperate with the limiting block and the limiting groove to limit the rotation range of the locking wrench.

[0014] In some embodiments, a limiting ring groove is formed on the locking shaft, and a retaining ring for positioning the locking shaft is provided in the limiting ring groove.

[0015] The beneficial effects of this application are as follows: by operating the locking wrench to rotate the locking shaft, the convex or concave part is switched to contact the contact plate. When the concave part is in contact with the contact plate, the rotating block is not under force, and the rocker arm can be freely adjusted in angle. When the convex part is in contact with the contact plate, the convex part lifts the contact plate upward, causing the rotating block to rotate, driving the spring plate and friction plate to contact and press the locking plate on the base, thereby locking the rocker arm. The structure is simple and easy to operate, and the rocker arm can be locked and unlocked quickly. Moreover, the locking wrench has a moderate height, a large length and volume, which facilitates the gripping and operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a three-dimensional schematic diagram of this application.

[0018] Figure 2 is a three-dimensional schematic diagram of this application from another angle.

[0019] Figure 3 is an exploded view of the rocker arm and its components in this application.

[0020] Figure 4 is a cross-sectional schematic diagram of this application.

[0021] Figure 5 is a schematic diagram of the base of this application.

[0022] Figure 6 is a schematic diagram of the rotating block and locking shaft of this application.

[0023] Figure 7 is an exploded view of the rotating block and its components according to this application.

[0024] The following are the symbols and their meanings: 1. Base, 2. Turntable, 3. Fixing block, 4. Locking plate, 401. Protruding plate, 5. Rocker arm, 6. Locking shaft, 601. Protrusion, 602. Recess, 603. Limiting ring groove, 7. Locking wrench, 701. Limiting block, 702. Limiting groove, 8. Rotating block, 801. Contact plate, 802. Positioning post, 9. Spring plate, 901. Mounting groove, 902. Protrusion, 903. Opening groove, 10. Spring plate, 11. Positioning groove, 12. Adjusting bolt, 13. Adjusting nut, 14. Friction enhancer, 15. Positioning block, 16. Snap ring, 17. Support post. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0026] In this embodiment of the application, please refer to Figures 1-7. The rocker arm locking structure of the pull rod oblique cut saw mainly includes: a base 1, a turntable 2 formed on one side of the base 1, a fixing block 3 fixed inside the turntable 2, and a locking plate 4 fixed at the outer end of the fixing block 3; a rocker arm 5, rotating on the turntable 2, and a locking assembly is provided on the rocker arm 5. The locking assembly includes: a locking shaft 6, horizontally arranged and rotating on the rocker arm 5, with a locking wrench 7 fixed at its end for operating the rotation, and a recess 602 and a protrusion 601 formed on the locking shaft 6; and a rotating block 8, the main body of which is L-shaped and hinged to the rocker arm 5, with an L-shaped downwardly bent contact plate 801 formed in its middle, the contact plate 801 being located above the locking shaft 6 and half- The locking shaft 6 is wrapped around the rotating block 8 below the contact plate 801, where two positioning posts 802 are formed. The positioning posts 802 contain a spring plate 9 and a spring plate 10, which are restricted between the rotating block 8 and the locking plate 4. The rotating shaft is always in contact with the contact plate 801. When the recess 602 is in contact with the contact plate 801, the rotating block 8 is not under force. When the protrusion 601 is in contact with the contact plate 801, the contact plate 801 is lifted, and the rotating block 8 drives the spring plate 9 to press the locking plate 4, thereby locking the rocker arm 5. Specifically, the spring fixing block 3 is fixed to the turntable 2 by hexagonal bolts, and the locking plate 4 is also fixed to the spring fixing block 3 by hexagonal bolts.

[0027] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0028] As shown in Figure 7, both the spring plate 9 and the spring plate 10 are provided with positioning grooves 11 that match the positioning posts 802. The spring plate 9 and the spring plate 10 are limited on the rotating block 8 by the cooperation of the positioning grooves 11 and the positioning posts 802. The two positioning posts 802 pass through the positioning grooves 11 on the spring plate 9 and the spring plate 10, limiting the spring plate 9 and the spring plate 10 on the rotating block 8, so that the spring plate 9 and the spring plate 10 can only move laterally on the positioning posts 802.

[0029] As shown in Figures 3-4, the spring plate 10 is disposed between the spring plate 9 and the rotating block 8. An adjusting bolt 12 is screwed onto the rotating block 8. The adjusting bolt 12 passes through the rotating block 8 and abuts against the spring plate 10. By adjusting the lateral position of the adjusting bolt 12, the position of the spring plate 10 on the positioning post 802 is adjusted, which ultimately plays the role of adjusting the position of the spring plate 9 and the friction plate, thereby changing and adjusting the pressure of the friction plate 14 on the locking plate 4 when the locking rocker arm 5 is locked.

[0030] In one embodiment, the rotating block 8 is directly threaded onto the adjusting bolt 12, and an adjusting nut 13, threaded onto the adjusting bolt 12, is movably disposed between the rotating block 8 and the adjusting bolt 12. The adjusting nut 13 is in surface contact with the rotating block 8, which improves the stability of the screwed connection between the adjusting bolt 12 and the rotating block 8 and prevents the adjusting nut 13 from loosening due to vibration during use. In addition, the adjusting nut 13 can be rotated with a tool to adjust the lateral position of the adjusting bolt 12, making it convenient to operate the adjusting bolt 12. In another embodiment, the adjusting nut 13 is fixedly disposed on the rotating block 8, and the adjusting bolt 12 is threaded onto the adjusting nut 13. Here, the adjusting nut 13 also enhances the overall stability of the connection between the adjusting bolt 12 and the rotating block 8. When adjusting the lateral position of the adjusting bolt 12, it is necessary to directly rotate the adjusting bolt 12.

[0031] As shown in Figures 3 and 7, the spring plate 9 has a mounting groove 901 on one side and two protrusions 902 on the other side. The protrusions 902 contact the spring plate 10. A friction-enhancing plate 14 with an outer contour consistent with the mounting groove 901 is provided in the mounting groove 901. The friction-enhancing plate 14 protrudes slightly from the outer surface of the rotating block 8. In addition, the friction-enhancing plate 14 is constrained between the mounting groove 901 and the locking plate 4. Specifically, the two protrusions 902 are located at the upper and lower ends of the spring plate 9, respectively. 11. Through protrusions 902, two protrusions 902 directly contact the spring plate 10. The gap between the two protrusions 902 provides space for the elastic deformation of the spring plate 10. Here, the spring plate 10 serves two purposes: first, it acts as an elastic medium between the spring plate 9 and the rotating block 8, ensuring that the spring plate 9 and the locking plate 4 form surface contact rather than point contact, thereby improving the stability of the locking force and the wear resistance of the locking surface; second, during the mitered saw cutting operation, the vibration generated by the high-speed rotation of the saw blade is transmitted to the locking structure through the rocker arm 5. The elastic characteristics of the spring plate 10 can form a dynamic damping effect, reducing the probability of fatigue damage to the locking assembly. The friction-enhancing plate 14 directly contacts the locking plate 4. The friction-enhancing plate 14 is made of a material with a higher coefficient of friction (compared to the spring plate 9), which can increase the friction force on the locking plate 4 under pressure, resulting in a better locking effect. At the same time, the protruding friction-enhancing plate 14 can also cope with the wear of daily use, leaving redundant space for wear and preventing the spring plate 4 from being directly worn.

[0032] During component assembly, the grinding pad is first installed into the mounting groove 901 on the spring plate 9. Then, the spring plate 9 and the spring plate 10 are installed onto the positioning post 802 through the positioning groove 11. Next, the adjusting bolt 12 and the adjusting nut 13 are installed onto the rotating block 8 to position the spring plate 10. Finally, the rotating block 8 is hinged and positioned on the rocker arm 5.

[0033] Furthermore, the locking plate 4 extends an arc-shaped protrusion 401 from its edge toward the rotating block 8. The spring plate 9 above the mounting groove 901 has an opening groove 903 with an arc-shaped wall. When the spring plate 9 abuts against the locking plate 4, the protrusion 401 is placed in the opening groove 903. Since the groove wall of the opening groove 903 can abut against the protrusion 401 when the rocker arm 5 deflects, it prevents the rocker arm 5 from moving and further assists in locking the rocker arm 5. At the same time, the arc-shaped protrusion 401 and the side wall of the opening groove 903 can also distribute the pressure and reduce damage to the components.

[0034] As shown in Figure 3, a support column 17 is formed inside the rocker arm 5. The support column 17 is directly opposite the spring plate 9 and the friction-increasing block. It provides support for the locking plate 4 when the friction-increasing plate 14 presses against the locking plate 4, preventing the locking plate 4 from deforming too much and extending its service life.

[0035] Furthermore, a limiting ring groove 603 is provided on the locking shaft 6, and a retaining ring 16 for positioning the locking shaft 6 is provided in the limiting ring groove 603. The retaining ring 16 and the limiting ring groove 603 lock the locking pin on the rocker arm 5, so that the locking pin can only rotate.

[0036] As shown in Figure 2, the locking wrench 7 has a limiting block 701 and a limiting groove 702, and the rocker arm 5 has two positioning blocks 15. The positioning blocks 15 are used to cooperate with the limiting block 701 and the limiting groove 702 to limit the rotation range of the locking wrench 7.

[0037] In use, when the locking wrench 7 is adjusted so that the recess 602 of the locking pin contacts the contact plate 801, the rotating block 8 is not under force, and there is no pressure between the friction plate 14 and the locking plate 4. The rocker arm 5 can be freely adjusted in angle on the turntable 2. After adjusting to a suitable angle, the locking wrench 7 is operated so that the protrusion 601 of the locking pin contacts the contact plate 801. The contact plate 801 is lifted by force, driving the rotating block 8 to deflect downward and closer to the locking plate 4. This causes the friction plate 14 to be pressed and contact the locking plate 4 on the turntable 2. The friction between the friction plate 14 and the locking plate 4 prevents the rocker arm 5 from rotating on the turntable 2, thus locking the rocker arm 5. If the friction is insufficient, the position of the spring plate 10 can be controlled by adjusting the adjusting bolt 12, so that the position of the friction plate on the spring plate 9 supported by the spring plate 10 is closer to the locking plate 4. This increases the pressure on the friction plate and the friction between it and the locking plate 4, thus locking the rocker arm 5.

[0038] It should be noted that the friction-enhancing plate 14 is a component that directly contacts the locking plate 4, but the friction-enhancing plate 14 is fixed in the mounting groove 901 on the spring plate 9. They can be regarded as two parts of the same component. The description above of the spring plate 9 pressing the locking plate 4 is unambiguous.

[0039] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A rocker arm locking structure for a tie rod bevel saw, characterized in that, include: A base, wherein a turntable is formed on one side of the base, a fixing block is fixed inside the turntable, and a locking plate is fixed to the outer end of the fixing block; A rocker arm rotates on the turntable. A locking assembly is provided on the rocker arm, comprising: a locking shaft, horizontally positioned and rotating on the rocker arm, with a locking wrench fixed to its end for operation; the locking shaft has a recess and a protrusion; and a rotating block, L-shaped in body, hinged to the rocker arm, with an L-shaped downward-bent contact plate in its middle section. The contact plate is located above and partially encloses the locking shaft. Two positioning posts are formed on the rotating block below the contact plate, each containing a spring plate and a spring plate, which are confined between the rotating block and the locking plate. When the recess contacts the contact plate, the rotating block is not subjected to force; when the protrusion contacts the contact plate, the contact plate is lifted, and the rotating block drives the spring plate to press against the locking plate, thus locking the rocker arm.

2. The rocker arm locking structure of a tie rod bevel saw according to claim 1, characterized in that, Both the spring plate and the spring plate are provided with positioning grooves that match the positioning post. The spring plate and the spring plate are limited on the rotating block by the cooperation of the positioning grooves and the positioning post.

3. The rocker arm locking structure of a tie rod bevel saw according to claim 1, characterized in that, The spring plate is disposed between the spring plate and the rotating block. An adjusting bolt is screwed onto the rotating block, and the adjusting bolt passes through the rotating block and abuts against the spring plate.

4. The rocker arm locking structure of a tie rod bevel saw according to claim 3, characterized in that, The spring plate has a mounting groove on one side and two protrusions on the other side. The protrusions contact the spring plate. A friction-enhancing plate with an outer contour consistent with the mounting groove is provided in the mounting groove. The friction-enhancing plate protrudes slightly from the outer surface of the rotating block. In addition, the friction-enhancing plate is constrained between the mounting groove and the locking plate.

5. The rocker arm locking structure of a tie rod bevel saw according to claim 4, characterized in that, The locking plate has an arc-shaped protrusion extending from its edge toward the rotating block. The spring plate above the mounting groove has an opening groove with an arc-shaped wall. When the spring plate is pressed against the locking plate, the protrusion is placed in the opening groove.

6. The rocker arm locking structure of a tie rod bevel saw according to claim 4, characterized in that, A support column is formed inside the rocker arm, and the support column is directly opposite the spring plate and the friction plate.

7. The rocker arm locking structure of a tie rod bevel saw according to claim 1, characterized in that, The locking wrench has a limiting block and a limiting groove, and the rocker arm has two positioning blocks. The positioning blocks are used to cooperate with the limiting block and the limiting groove to limit the rotation range of the locking wrench.

8. The rocker arm locking structure of a tie rod bevel saw according to claim 1, characterized in that, A limiting ring groove is formed on the locking shaft, and a retaining ring for positioning the locking shaft is provided in the limiting ring groove.

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