Connecting rod of tapper

Abstract

The utility model relates to the field of tappers, in particular to a tapper connecting rod. A tapper connecting rod comprises a base, an outer cutting knife connected to the base, a drilling assembly installed on the inner side of the base and a knife lock assembly located on the outer side of the base and used for locking the outer cutting knife, and a threaded hole used for being in threaded fit with the base and a positioning hole located in the side face of the threaded hole are formed in the outer cutting knife. The cutter lock assembly comprises a positioning piece arranged on the base in a sleeving mode and a cutter lock housing rotationally connected with the base, the positioning piece comprises a positioning column penetrating through the base to be inserted into the positioning hole, and the cutter lock housing is in threaded fit with the positioning piece. When the outer cutter needs to be replaced, the cutter lock housing is rotated, and the positioning piece in threaded fit with the cutter lock housing cannot rotate freely due to limitation of the positioning column and the positioning hole, so that the positioning piece moves downwards. And when the positioning column is separated from the positioning hole, the outer cutting knife can be screwed off and replaced by a new outer cutting knife.

Description

Technical Field

[0001] This application relates to the field of hole openers, and more particularly to a hole opener connecting rod. Background Technology

[0002] Currently, when the external cutting blade of the hole opener needs to be replaced, a tool is needed to first unscrew the positioning pin that restricts the relative rotation of the external cutting blade and the base, then remove the external cutting blade that is threaded to the base, and then replace it with a new external cutting blade.

[0003] While the aforementioned technologies do not cause significant problems when used by professionals, the method of replacing the external cutting blade is rather inconvenient when used as a household hole saw. Utility Model Content

[0004] To facilitate the replacement of the external cutting tool, this application provides a hole opener extension rod.

[0005] This application provides a hole opener connector rod, which adopts the following technical solution:

[0006] A hole opener connector includes a base, an external cutting blade connected to the base, a drilling assembly mounted on the inner side of the base, and a tool locking assembly located on the outer side of the base for locking the external cutting blade. The external cutting blade has a threaded hole for threaded engagement with the base and a positioning hole located on the side of the threaded hole. The tool locking assembly includes a positioning element sleeved on the base and a tool locking cover rotatably connected to the base. The positioning element includes a positioning pin that passes through the base and inserts into the positioning hole. The tool locking cover is threadedly engaged with the positioning element.

[0007] By adopting the above technical solution, when the external cutting tool needs to be replaced, the tool lock cover is rotated. The positioning component, which is threaded into the tool lock cover, cannot rotate freely due to the restriction of the positioning pin and the positioning hole, and therefore moves downwards. Until the positioning pin disengages from the positioning hole, it can be unscrewed and a new external cutting tool can be replaced. Then, the tool lock cover is rotated in the opposite direction, causing the positioning pin to re-insert into the positioning hole and lock the external cutting tool. No tools are required to replace the cutting tool, making it more convenient to use.

[0008] Preferably, a groove is formed on the outer side wall of the base, and a rotation limiting element is provided in the groove to cooperate with the knife lock cover and restrict the free rotation of the knife lock cover.

[0009] By adopting the above technical solution, the knife lock cover will not rotate freely when no external force is applied, thanks to the rotation limiting component.

[0010] Preferably, the rotation limiting component includes a rotation limiting ball located in the mounting groove and rotation limiting springs at both ends that abut against the bottom of the mounting groove and the rotation limiting ball, respectively; a continuous rotation limiting groove is formed at the position where the upper end of the knife lock cover mates with the rotation limiting component, forming a wavy inner sidewall.

[0011] By adopting the above technical solution, the rotation limiting spring applies force to the rotation limiting ball, which is pressed against the rotation limiting groove. Only by applying force can the knife lock cover rotate, overcoming the force of the rotation limiting spring and allowing the rotation limiting ball to reach the next rotation limiting groove.

[0012] Preferably, the positioning element includes a positioning ring and two positioning pins integrally formed on both sides above the positioning ring, and the number of positioning holes is two and located on both sides of the threaded hole.

[0013] By adopting the above technical solution, two positioning posts and two positioning holes are set up to cooperate.

[0014] Preferably, it also includes a rod lock assembly for locking the drilling assembly so that the base and the drilling assembly cannot slide relative to each other.

[0015] Preferably, the drilling assembly includes a center drill with an external hexagonal cross-section and a drill bit connected to the upper end of the center drill, and the center of the base is formed with an internal hexagonal hole that mates with the center drill.

[0016] Preferably, the side wall of the base is formed with a lower through hole communicating with the internal hexagonal hole, and the center drill is formed with a groove on the side facing the lower through hole when it is located inside the base; the rod lock assembly includes a rod lock cover sleeved on the outside of the base, a rod lock spring that applies force to the rod lock cover, and a lower lock ball located in the lower through hole, the inner side of the rod lock cover is formed with an abutment ring whose inner wall fits against the base, and the diameter of the lower lock ball is greater than the wall thickness of the small diameter section.

[0017] By adopting the above technical solution, when the drilling is completed and material needs to be removed, the rod lock cover is pressed downwards, causing the abutment ring to disengage from the lower through hole. At this time, the lower locking ball disengages from the groove, allowing the entire base to slide downwards along the center drill. The material cut off from the drill bit then disengages from the outer cutting blade, allowing for quick removal. When drilling is needed again after completion, the base is simply reset.

[0018] Preferably, the diameter of the lower through hole gradually decreases on the side closest to the internal hexagonal hole, and the diameter of the lower locking ball is greater than the small end diameter of the lower through hole and less than the large end diameter of the lower through hole.

[0019] Preferably, a second annular groove is formed on the base below the rod lock cover, and a second limiting ring abuts against the lower end face of the rod lock cover inside the second annular groove.

[0020] By adopting the above technical solution, the relative positions of the locking rod cover and the base are limited by the second limiting ring installed in the second annular groove.

[0021] Preferably, a first annular groove is formed on the base below the knife lock cover, and a first limiting ring abuts against the lower end face of the knife lock cover inside the first annular groove.

[0022] By adopting the above technical solution, the relative positions of the knife lock cover and the base are limited by the first limiting ring installed in the first annular groove.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When changing the external cutting tool, rotate the tool lock cover. The locating element, which is threaded into the tool lock cover, cannot rotate freely due to the restriction of the locating pin and locating hole, and will therefore move downwards. Once the locating pin disengages from the locating hole, it can be unscrewed and a new external cutting tool can be replaced. Then, rotate the tool lock cover in the opposite direction to allow the locating pin to re-insert into the locating hole and lock the external cutting tool. No tools are required for changing the cutting tool, making it more convenient to use. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment;

[0026] Figure 2 This is a cross-sectional schematic diagram of an embodiment;

[0027] Figure 3 This is a partial cross-sectional view of the limiting component portion in the embodiment.

[0028] Explanation of reference numerals in the attached drawings: 1. Base; 2. External cutting tool; 3. Drilling assembly; 4. Tool lock assembly; 5. Rod lock assembly; 6. Large diameter section; 7. Medium diameter section; 8. Small diameter section; 9. Threaded section; 10. Internal hexagonal hole; 11. Upper through hole; 12. Mounting groove; 13. First annular groove; 14. First limiting ring; 15. Lower through hole; 16. Tool body; 17. Base plate; 18. Positioning hole; 19. Center drill; 20. Drill bit; 21. Groove; 22. Positioning component; 23. Tool lock cover; 24. Rotation limiting component; 25. Positioning ring; 26. Positioning pin; 27. Rotation limiting groove; 28. Rotation limiting ball; 29. ​​Rotation limiting spring; 30. Rod lock cover; 31. Rod lock spring; 32. Lower locking ball; 33. Abutment ring; 34. Second annular groove; 35. Second limiting ring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0030] This application discloses a hole opener connecting rod. The terms "up", "down", "left" and "right" used in the embodiments are schematic representations of relative directions and are not limitations on the positional relationship.

[0031] like Figure 1The hole opener connecting rod includes a base 1, an outer cutting blade 2 connected to the base 1, a drilling assembly 3 installed on the inner side of the base 1, a blade locking assembly 4 located on the outer side of the base 1 for locking the outer cutting blade 2, and a rod locking assembly 5 for locking the drilling assembly 3.

[0032] like Figure 2 The base 1 includes a large-diameter section 6, a medium-diameter section 7, and a small-diameter section 8, whose diameters gradually decrease from top to bottom, and a threaded section 9 located above the large-diameter section 6. A hexagonal socket hole 10 is formed in the center of the base 1, extending downwards through the entire base 1. Two upper through holes 11 are formed on the upper surface of the large-diameter section 6, located on both sides of the threaded section 9, extending downwards through the large-diameter section 6 and the medium-diameter section 7. A mounting groove 12 is formed on the side of the medium-diameter section 7. A first annular groove 13 is formed on the outer ring of the middle part of the small-diameter section 8, and a second annular groove 34 is formed on the lower outer ring of the small-diameter section 8. A lower through hole 15, communicating with the hexagonal socket hole 10, is formed on the side of the small-diameter section 8 between the first annular groove 13 and the second annular groove 34. The diameter of the lower through hole 15 gradually decreases on the side closest to the hexagonal socket hole 10.

[0033] like Figure 2 The external cutting tool 2 includes an annular tool body 16 and a base plate 17 connected to the lower end of the tool body 16. The center of the base plate 17 is formed with a threaded hole that mates with the threaded section 9. A positioning hole 18 is formed on each side of the threaded hole on the base plate 17.

[0034] like Figure 2 The drilling assembly 3 includes a central drill 19 with an external hexagonal cross-section and a drill bit 20 connected to the upper end of the central drill 19. When the central drill 19 is located inside the base 1, a groove 21 is formed on the side facing the lower through hole 15.

[0035] like Figure 2 and Figure 3The knife lock assembly 4 includes a positioning member 22 fitted onto the end of the small diameter section 8 near the middle diameter section 7, a knife lock cover 23 that controls the lifting and lowering of the positioning member 22, and a rotation limiting member 24 installed in the mounting groove 12 and cooperating with the knife lock cover 23. The positioning member 22 includes a positioning ring 25 fitted onto the outside of the small diameter section 8 and two positioning posts 26 integrally formed above the positioning ring 25. The positioning posts 26 pass upward through the upper through hole 11 and cooperate with the positioning hole 18. The outer side of the positioning ring 25 is formed with external threads. The knife lock cover 23 is fitted onto the outside of the small diameter section 8 and the middle diameter section 7. A first limiting ring 14 is installed in the first annular groove 13 and abuts against the lower end of the knife lock cover 23, allowing the knife lock cover 23 to rotate only around the base 1. The inner side of the knife lock cover 23 is formed with internal threads that cooperate with the positioning ring 25. A continuous rotation limiting groove 27 is formed at the upper end of the knife lock cover 23 where it cooperates with the middle diameter section 7, forming a wavy inner wall. The rotation limiting component 24 includes a rotation limiting ball 28 located in the mounting groove 12 and rotation limiting springs 29 whose two ends respectively abut against the bottom of the mounting groove 12 and the rotation limiting ball 28.

[0036] like Figure 2 The lever lock assembly 5 includes a lever lock housing 30 connected to the small-diameter section 8, a lever lock spring 31 that applies an upward force to the lever lock housing 30, and a lower locking ball 32 located within the lower through hole 15. The diameter of the lower locking ball 32 is larger than the small end diameter of the lower through hole 15 but smaller than the large end diameter of the lower through hole 15, so that only a portion of the lower locking ball 32 can enter the internal hexagonal hole 10 and engage with the groove 21. Furthermore, the diameter of the lower locking ball 32 is larger than the wall thickness of the small-diameter section 8, so that the base 1 and the lever lock assembly 5 can only slide relative to each other when the lower locking ball 32 moves outward to unlock. An abutment ring 33 is formed on the inner side of the lever lock housing 30, and the inner diameter of the abutment ring 33 is equal to the outer diameter of the small-diameter section 8. A second limiting ring 35 is installed in the second annular groove 34. The lower end of the lever lock spring 31 abuts against the second limiting ring 35, and the upper end of the lever lock spring 31 abuts against the abutment ring 33. When no other external force is applied, the abutment ring 33 is located just outside the lower through hole 15. When the lever lock cover 30 is pressed down, the lever lock spring 31 is compressed, the abutment ring 33 is disengaged from the lower through hole 15, and the lower locking ball 32 can move relative to disengage from the groove 21. At this time, the base 1 can slide along the length direction of the central drill 19.

[0037] Specific usage process:

[0038] When the outer cutting tool 2 needs to be replaced, rotate the tool lock cover 23. The positioning element 22, which is threaded into the tool lock cover 23, cannot rotate freely due to the restriction of the positioning pin 26 and the upper through hole 11, and therefore will move downwards. Until the positioning pin 26 disengages from the positioning hole 18, it can be unscrewed and a new outer cutting tool 2 can be replaced. Then, rotate the tool lock cover 23 in the opposite direction so that the positioning pin 26 re-inserts into the positioning hole 18 to lock the outer cutting tool 2.

[0039] During the drilling operation, the lower locking ball 32 is engaged in the groove 21. When the drilling is complete and material needs to be removed, the rod lock cover 30 is pressed downwards, causing the abutment ring 33 to disengage from the lower through hole 15. At this time, the lower locking ball 32 disengages from the groove 21, allowing the entire base 1 to slide downwards along the central drill 19. The material cut off and located on the drill bit 20 is then removed from the position of the outer cutting blade 2, allowing for quick removal of the material. When drilling is required again after the operation is complete, the base 1 can be reset.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reamer extension rod characterized by, The device includes a base (1), an external cutting tool (2) connected to the base (1), a drilling assembly (3) installed inside the base (1), and a tool locking assembly (4) located outside the base (1) for locking the external cutting tool (2). The external cutting tool (2) has a threaded hole for threaded engagement with the base (1) and a positioning hole (18) located on the side of the threaded hole. The tool locking assembly (4) includes a positioning element (22) sleeved on the base (1) and a tool locking cover (23) rotatably connected to the base (1). The positioning element (22) includes a positioning pin (26) that passes through the base (1) and inserts into the positioning hole (18). The tool locking cover (23) is threadedly engaged with the positioning element (22).

2. The reamer handle of claim 1 wherein, The base (1) has a groove (21) formed on its outer side wall. The groove (21) is provided with a rotation limiting member (24) that cooperates with the knife lock cover (23) to restrict the free rotation of the knife lock cover (23).

3. The reamer handle of claim 2 wherein, The rotation limiting component (24) includes a rotation limiting ball (28) located in the mounting groove (12) and rotation limiting springs (29) whose two ends respectively abut against the bottom of the mounting groove (12) and the rotation limiting ball (28); a continuous rotation limiting groove (27) is formed at the position where the upper end of the knife lock cover (23) cooperates with the rotation limiting component (24) to form a wave-shaped inner wall.

4. The reamer handle of claim 1 wherein, The positioning component (22) includes a positioning ring (25) and two positioning pins (26) integrally formed on both sides above the positioning ring (25). The number of positioning holes (18) is two and they are located on both sides of the threaded hole.

5. The reamer handle of claim 1 wherein, It also includes a rod lock assembly (5) for locking the drilling assembly (3) so that the base (1) and the drilling assembly (3) cannot slide relative to each other.

6. The reamer handle of claim 5 wherein, The drilling assembly (3) includes a center drill (19) with an external hexagonal cross-section and a drill bit (20) connected to the upper end of the center drill (19). The base (1) has an internal hexagonal hole (10) formed in the center to cooperate with the center drill (19).

7. The reamer handle of claim 6 wherein, The base (1) has a lower through hole (15) formed on its side wall, which communicates with the internal hexagonal hole (10). When the center drill (19) is located inside the base (1), a groove (21) is formed on the side facing the lower through hole (15). The rod lock assembly (5) includes a rod lock cover (30) sleeved on the outside of the base (1), a rod lock spring (31) that applies force to the rod lock cover (30), and a lower lock ball (32) located in the lower through hole (15). The inner side of the rod lock cover (30) has an abutment ring (33) whose inner wall fits against the base (1). The diameter of the lower lock ball (32) is greater than the wall thickness of the small diameter section (8).

8. The reamer handle of claim 7 wherein, The diameter of the lower through hole (15) gradually decreases on the side near the internal hexagonal hole (10), and the diameter of the lower locking ball (32) is greater than the small end diameter of the lower through hole (15) and smaller than the large end diameter of the lower through hole (15).

9. The reamer handle of claim 7 wherein, A second annular groove (34) is formed on the base (1) below the rod lock cover (30), and a second limiting ring (35) abuts against the lower end face of the rod lock cover (30) inside the second annular groove (34).

10. The reamer handle of claim 1 wherein, The first annular groove (13) is formed on the base (1) at a position below the knife lock cover (23), and a first limiting ring (14) is in abutment with the lower end surface of the knife lock cover (23) in the first annular groove (13).

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