Expanding guide support sheet detachable tapping device

Abstract

The present application is a reamer guiding support piece detachable type opening device, which is assembled on the front end of the transmission shaft of the drill chuck, provided with a front end bolt part and a front end flywheel, and on the lower side of the front end flywheel, a flywheel nut is screw-engaged on the transmission shaft, a plurality of combination rods are clamped at a certain interval on the front end flywheel, the lower end is blocked by the front of the flywheel nut, a helical spring and a dust scattering prevention cap are sequentially combined on the lower end of the front end bolt which is screw-engaged / detached with the opening main body on the outside of the integrated transmission shaft, a conical fastener filling rod with a screw part at the upper end is formed in one piece on the upper end center of the front end bolt part, a conical fastener ejection helical spring and a conical fastener with a narrow upper part and a wide lower part and a central line through the plug-in hole are sequentially clamped and combined on the conical fastener filling rod on the upper side of the opening main body, and a plurality of reamer guiding support pieces are detached and assembled at a certain interval by the detachable device part on the outside of the conical fastener.

Description

[Technical Field]

[0001] This invention relates to an improved hole-drilling device for drilling holes of a predetermined size on a flat surface such as a ceiling, which is mounted on an electric drill. The improved device is a hole-drilling guide support plate removable hole-drilling device used to drill larger holes (diameters) already drilled in the ceiling or similar locations.

[0002] To be more specific,

[0003] A front bolt and a front flywheel are provided on the front end of the drive shaft mounted on the electric drill chuck. A flywheel nut is screwed onto the drive shaft below the front flywheel. Multiple connecting rods are clamped at intervals on the front flywheel, with their lower ends blocked by the flywheel nut. A helical spring and a dust-proof cap are sequentially connected to the drive shaft, which is integrated with the lower end of the front bolt, which can be screwed onto / separated from the drilling body. A conical fastener loading rod with a screw at its upper end is integrated at the center of the upper end of the front bolt. On the conical fastener loading rod, a conical fastener ejection helical spring and a conical fastener (narrower at the top and wider at the bottom) with a central insertion / removal hole are sequentially clamped and connected on the upper side of the drilling body.

[0004] Furthermore, the conical fastener has a hole-expanding guide support plate loading and unloading device that allows multiple hole-expanding guide support plates to be loaded and unloaded at certain intervals on the outside of the conical fastener. [Background Technology]

[0005] The hole-drilling device used on electric drills is mainly used to drill holes of a predetermined size in ceilings and other flat surfaces when installing various devices such as lights, speakers, and fire detectors.

[0006] Existing opening devices include Korean Utility Model Publication No. 20-1990-10985 and Patent Publication No. 10-1994-10892, as well as Publication No. 10-2004-74943 and Registered Patent No. 10-0473035, etc.

[0007] The following is in conjunction with the appendix Figure 1 These existing opening devices 10 will be described.

[0008] The front end of the drive shaft 12 mounted on the chuck of the electric drill 11 (not shown in detail) has a front bolt part 16 and a front flywheel 18 integrated together. The drive shaft 12 at the lower end of the front flywheel 18 has a flywheel nut 19 that is screwed together. Multiple connecting rods 19-1, which are blocked at the front end by the flywheel nut 19, are clamped on the front flywheel 18 at certain intervals.

[0009] A center drill 21 is provided at the center of the front bolt part 16. The opening body 20 can be screwed together and separated from the outside of the front bolt part 16 by the fastening nut rod located in the center.

[0010] A dust-proof cap 25 is provided (assembled) on the drive shaft 12 on the lower side of the conical head 17, so that the support ring 27 is clamped by the support part 26 and covers the outside of the opening body 20.

[0011] When drilling a hole in the ceiling 1 using the hole-drilling device 10 formed as described above, with the center drill 21 fixed in a predetermined position, the electric drill 11 is started to rotate the hole-drilling body 20, thereby drilling an existing hole 2 of a predetermined size (diameter).

[0012] However, if one wants to use the existing drilling device formed and used as described above to drill an expanded predetermined hole 3 with a diameter larger than the existing hole 2, there are defects in the following aspects.

[0013] Through the existing small-diameter (R1) hole 2 drilled in the ceiling 1, the square material (not shown in the specific diagram) is introduced into the interior (upper side) of the ceiling 1. After the ceiling 1 and the square material (not shown in the specific diagram) are fixed in place by means of long bolts and screws (not shown in the specific diagram), the existing small-diameter opening body 20 is replaced by another opening body 20 with a larger diameter for assembly.

[0014] As described above, with the ceiling 1 and the square material (not shown in the specific illustration) fixed together by the fixing means (long bolts and screws 6), the center drill (not shown in the specific illustration) is inserted through the existing hole 2, the electric drill 11 is started, so that the center drill (not shown in the specific illustration) and the hole-making body 20 operate (rotate) at the same time. Then, while drilling a hole in the square material (not shown in the specific illustration) with the center drill (not shown in the specific illustration), the hole-making body 20 drills a large-diameter (R2) expansion hole 3.

[0015] Then, when drilling a large-diameter (R3) expansion hole 3 in the ceiling 1 using the existing drilling device 10, the square material (not shown in the specific illustration) is introduced into the interior (upper side) of the ceiling 1, and the ceiling 1 and the square material (not shown in the specific illustration) are fixed by fixing means such as long bolts and screws (not shown in the specific illustration). Therefore, in addition to being more cumbersome to operate, it also takes a long time.

[0016] Furthermore, when drilling a hole in the square material (not shown in detail) with a center drill (not shown in detail) and drilling the expansion pre-drilled hole 3 with the hole-opening body 20, if the existing hole-opening device is not firmly gripped, the existing hole-opening device, including the electric drill 11, will shake, making it difficult and impossible to drill the expansion pre-drilled hole 3 accurately. When the center drill (not shown in detail) is combined (spiral joint) with the square material (not shown in detail), the expansion pre-drilled hole 3 may be drilled off-center depending on the position, which will result in the disadvantage of not being able to drill the expansion pre-drilled hole 3 in the accurate position.

[0017] To address the existing problems described above, this invention proposes registered patent No. 10-1926253 (hole enlargement and through-hole type opening device).

[0018] Figure 1 The example in the text is the hole-expanding type hole-opening device (10-1: hole-expanding cap detachable hole-opening device), which was developed by me and first registered with patent number 10-1926253.

[0019] An expandable removable cap 45 can also be fitted on the outside of the conical fastener 40. The expandable removable cap 45 can be locked and released by using the locking (loading and unloading) device of the locking ball 46.

[0020] However, this makes it difficult to manufacture and process other expandable detachable caps 46 of different sizes, and increases manufacturing costs. The structure of the retaining (detachable) device using the locking ball 46 is complex, making it difficult to set up the retaining (detachable) device, and the phenomenon of the locking ball 46 detaching and being lost cannot be avoided. [Summary of the Invention]

[0021] [Technical Issues]

[0022] The present invention provides an opening device that can solve the problems described above through further improvements.

[0023] The purpose of this invention is to provide a front bolt portion and a front flywheel on the front end of the drive shaft assembled in an electric drill chuck. A flywheel nut is screwed onto the drive shaft below the front flywheel. Multiple connecting rods are clamped at intervals on the front flywheel, with the lower end blocked by the flywheel nut. A helical spring and a dust-proof cap are sequentially connected to the lower end of the front bolt, which can be screwed onto / separated from the hole-opening body on the outside. A conical fastener loading rod with a screw portion at the upper center of the front bolt portion is integrally formed. A conical fastener ejection helical spring and a conical fastener (narrower at the top and wider at the bottom) with a central insertion / removal hole are sequentially clamped onto the conical fastener loading rod on the upper side of the hole-opening body. Furthermore, multiple hole-expanding guide support plates are detachable and load / unloaded via a loading / unloading device on the outside of the conical fastener.

[0024] Another object of the present invention is to provide a hole-opening device that provides a plurality of hole-expanding guide support plates mounted on the outside of a conical fastener, which can be easily installed and removed by a loading and unloading device, and can be set with different widths and thus different sizes. The hole-expanding guide support plates of various sizes and widths can be selected and replaced according to the size (diameter) of the existing hole that has been drilled, thereby facilitating the drilling of holes with a larger diameter than the existing holes.

[0025] Another objective of this invention is to provide a hole-expanding guide support plate assembly on the outside of a conical fastener that is extremely simple in structure, easy to drill, lightweight, easy to operate, and can be manufactured in different widths. Therefore, it can be assembled (disassembled) according to the size (diameter) of the existing hole to improve the expandability of the hole-expanding guide support plate assembly and disassembly hole-opening device.

[0026] [Technical Solution]

[0027] To achieve the aforementioned and other objectives, the present invention provides a detachable hole-opening device 10-2 for enlarging guide support plates, preferably...

[0028] A front bolt portion 16 and a front flywheel 18 are provided on the front end of the drive shaft 12 assembled on the chuck of the electric drill 11. On the lower side of the front flywheel 18, a flywheel nut 19 is screwed onto the drive shaft 12. Multiple connecting rods 19-1 are clamped at certain intervals on the front flywheel 18, so that the lower end is blocked by the front of the flywheel nut 19. On the drive shaft 12, which can be screwed onto / separated from the opening body 20, a helical spring 15 and a dust-proof cap 25 are sequentially connected. At the upper center of the front bolt portion 16, a conical fastener loading rod 30 with a screw portion 31 at the upper end is integrally formed. On the conical fastener loading rod 30, a conical fastener ejection helical spring 35 and a conical fastener 40 with a narrow upper part and a wide lower part and a insertion hole 41 passing through the center line are sequentially clamped and connected on the upper side of the opening body 20.

[0029] Furthermore, on the outer side of the conical fastener 40, multiple enlarged hole guide support plates 50 can be loaded and unloaded at certain intervals through the loading and unloading device.

[0030] [Beneficial Effects]

[0031] The beneficial effects of the hole-expanding guide support plate detachable hole-opening device according to the present invention are as follows:

[0032] A front bolt and a front flywheel are provided on the front end of the drive shaft of the electric drill chuck. On the lower side of the front flywheel, a flywheel nut is screwed onto the drive shaft. Multiple connecting rods are clamped at certain intervals on the front flywheel, so that the lower end is blocked by the front of the flywheel nut. On the drive shaft, which can be screwed onto / separated from the hole-opening body, a helical spring and a dust-proof cap are sequentially connected. At the upper center of the front bolt, a conical fastener loading rod with a screw at the upper end is integrally formed. On the conical fastener loading rod, on the upper side of the hole-opening body, a conical fastener ejection helical spring and a conical fastener with a narrow upper part and a wide lower part forming a cone shape with a plug-in hole passing through the center line are sequentially clamped and connected. On the outer side of the conical fastener, multiple hole-expanding guide support plates can be loaded and unloaded at certain intervals through the loading and unloading device.

[0033] According to the present invention, the plurality of reaming guide support plates assembled on the outside of the conical fastener can be easily installed and removed by the installation and removal device. Moreover, the widths can be set differently, and thus the sizes can also be set differently. According to the size (diameter) of the existing hole that has been drilled, the reaming guide support plates of different widths and sizes can be selected, replaced, and installed (removed). Therefore, it is convenient to drill holes with a diameter larger than the existing holes. In addition, the plurality of reaming guide support plates assembled on the outside of the conical fastener have an extremely simple structure, are easy to drill with force, are lightweight, and are easy to operate. They can be manufactured in different widths, so they can be selected and installed (removed) according to the size (diameter) of the existing hole that has been drilled, thereby improving the expansion efficiency. [Attached Image Description]

[0034] Figure 1 This is a perspective view showing the detachable venting device for expanding caps that I developed and have registered;

[0035] Figure 2 This is an example perspective view showing the hole-expanding guide support plate detachable hole-opening device of the present invention;

[0036] Figure 3 This is a perspective view showing the enlarged main parts of the hole-expanding guide support plate detachable hole-opening device of the present invention;

[0037] Figure 4 This is an exploded perspective view showing the hole-expanding guide support plate detachable hole-opening device of the present invention.

[0038] Figure 5 This is a cross-sectional view showing the structure of the hole-expanding guide support plate detachable hole-opening device of the present invention;

[0039] Figure 6a and Figure 6b as well as Figure 6c These are example diagrams showing various embodiments of the reaming guide support plate in the detachable reaming device of the present invention;

[0040] Figure 7a and Figure 7b This is an explanatory diagram illustrating the operation of the hole-expanding guide support plate detachable hole-opening device of the present invention;

[0041] Figure 8a and Figure 8b This is an example diagram showing another embodiment of the hole-expanding guide support plate detachable hole-opening device of the present invention.

[0042] [Symbol Explanation]

[0043] 1: Ceiling; 2: Existing opening;

[0044] 3: Expanding the pre-drilled hole; 10: Opening device;

[0045] 10-1: Hole-expanding type opening device;

[0046] 10-2: Hole-enlarging guide support plate detachable hole-opening device;

[0047] 11: Electric drill; 12: Drive shaft;

[0048] 13, 31: Screw part; 14, 32: Wing nut;

[0049] 15: Coil spring for anti-scattering cap ejection; 20: Main body with opening;

[0050] 21: Center drill; 25: Dust-proof cap;

[0051] 30: Conical fastener loading rod; 35: Conical fastener ejection coil spring;

[0052] 40: Conical fastener; 41: Insertion / removal hole;

[0053] 50, 50-1, 50-2, 50-3: Hole-enlarging guide support plates;

[0054] 51: Fastening tab; 52: Fastening hole;

[0055] 60: Loading and unloading device; 61-1, 61-2: Connecting groove;

[0056] 62: Snap-fit ​​groove; 63: Magnet filling groove;

[0057] 64: Magnet; 65: Anti-detachment washer;

[0058] 67: Washer filling groove; 70: Clamping ball storage compartment;

[0059] 71: Screw part; 72: Snap-fit ​​ball;

[0060] 73: Helical spring; 74: Tension adjusting bolt.

Detailed Implementation Methods

[0061] The present invention and its other objects and technical features are described in detail and clearly below with reference to the accompanying drawings.

[0062] Appendix Figures 2 to 8b This is a specific embodiment of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention. Figure 2 This is an example perspective view showing the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention. Figure 3 This is a perspective view showing an enlarged view of the main parts of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention. Figure 4 and Figure 5This is an exploded perspective view and a combined sectional view showing the detachable hole-opening device 10-2 of the present invention. Figure 6a and Figure 6b as well as Figure 6c These are example diagrams illustrating various embodiments of the reaming guide support plates 50, 50-1, 50-2, and 50-3 in the reaming guide support plate detachable opening device 10-2 of the present invention. Figure 7a and Figure 7b This is an explanatory diagram illustrating the operation of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention. Figure 8a and Figure 8b This is an example diagram showing another embodiment of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention.

[0063] First, the structural composition of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention will be explained.

[0064] The front end of the drive shaft 12 mounted on the chuck of the electric drill 11 is provided with a front bolt part 16 and a front flywheel 18. A flywheel nut 18 is screwed on the drive shaft 12 on the lower side of the front flywheel 18. Multiple connecting rods 19-1 are clamped on the front flywheel 18 at certain intervals, so that the lower end is blocked by the front of the flywheel nut 19.

[0065] The opening body 20 can be assembled by spiral engagement / disengagement on the outer side of the front bolt part 16, and the helical spring 15 and the dust-proof cap 25 are sequentially connected on the drive shaft 12 formed integrally at the lower end of the front bolt part 16.

[0066] The conical fastener loading rod 30 with a screw part 31 at the upper center of the detachable front spiral part 16 of the opening body 20 is integrated with the opening body 20. The conical fastener ejection helical spring 35 is first clamped on the conical fastener loading rod 30 on the upper side of the opening body 20, and then the conical fastener 40 is clamped on the upper side of the conical fastener ejection helical spring 35.

[0067] Preferably, the conical fastener 40 is formed into a cone shape that is narrow at the top and wide at the bottom using metal material or synthetic resin. A plug-in hole 41 is drilled (formed) on the central line for inserting the conical fastener loading rod 30 and the conical fastener ejection helical spring 35, which can be interconnected from top to bottom. A bearing receiving chamber 42 is provided at the upper end of the plug-in hole 41 for inserting the bearing 43.

[0068] The conical fastener 40, which is clamped and engaged by the conical fastener loading rod 30 and ejected by the conical fastener ejection coil spring 35, is a retaining device formed at the upper end of the conical fastener loading rod 30. A screw part 31 is provided at the upper end of the conical fastener loading rod 30 for engaging the wing nut 32.

[0069] The structure described above is similar to that of the existing hole-opening device 10 and hole-expanding type hole-opening device 10-1, so it will not be described in detail again.

[0070] On the outside of the conical fastener 40 assembled to the conical fastener loading rod 30, a plurality of enlarged hole guide support plates 50 made of metal material or synthetic resin are detachably assembled at a certain distance from each other using an assembly device.

[0071] The enlarged hole guide support piece 50 is as follows: Figure 4 and Figure 5 and Figures 6a to 6c The formation shown is as follows. The length of the enlarged hole guide support piece 50 is set to be the same as or similar to the outer length of the conical fastener 40. The locking protrusion 51 protrudes at the center of the front end face to form a means of loading and unloading the loading and unloading device, and can then be locked (joined) in the locking groove 62, which will be described in detail later. The locking protrusion 51 is provided with a locking hole 52 with a transverse through hole.

[0072] Preferably, the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 are as follows: Figures 6a to 6c As shown, the width (W) can be set to various widths (W), such as a narrower width (W1), a medium width (W2), and a wider width (W3). By making the width (W) of the hole-expanding guide support plate 50 so diverse, hole-expanding guide support plates 50: 50-1, 50-2, 50-3 that match the existing small-diameter (R1) hole 2 drilled in the ceiling 1 can be selected and assembled onto the conical fastener 40.

[0073] As an assembly means for connecting the enlarged hole guide support pieces 50: 50-1, 50-2, 50-3 to the outside of the conical fastener 40, a plurality of fastening grooves 62 are provided at certain intervals on the horizontal center line outside the conical fastener 40. The upper and lower ends of each fastening groove 62 are aligned with the mating grooves 61-1 and 61-2 on a straight line. Preferably, the depth of the fastening groove 62 formed on the horizontal center line is deeper than that of the mating grooves 61-1 and 61-2 formed on its upper and lower ends.

[0074] Between the upper and lower ends of each snap-fit ​​groove 62, there are magnet filling grooves 63 with screw grooves 63-1 respectively. On each magnet filling groove 63, a disc-shaped magnet 64 is screwed and assembled with a screw bolt 64-1.

[0075] Each magnet filling slot 63 is equipped with a disc-shaped magnet 64, therefore the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 are preferably made of metal material.

[0076] In the conical fastener 40 and the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 formed as described above, the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 are fastened (joined) into the fastening groove 62 and the engagement groove 61-1, 61-2 formed on a straight line on the outside of the conical fastener 40. The fastening protrusions 51 of the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 are inserted into the fastening groove 62 for engagement. After the inner front ends (upper and lower ends) of the fastening protrusions 51 in the enlarged hole guide support plates 50: 50-1, 50-2, 50-3 are inserted into the engagement grooves 61-1, 61-2 for engagement, the inner front ends (upper and lower ends) of the fastening protrusions 51 are attracted by the magnetic force of the magnet 64 filled in the magnet filling groove 63, thereby maintaining the state of being blocked.

[0077] Furthermore, the upper end face of the conical fastener 40 is fitted with an anti-disengagement washer 65, which makes it easy to engage (assemble) the upper bearing 43 and prevents the upper bearing 43 from disengaging.

[0078] On the upper end face of the conical fastener 40, a washer filling groove 67 is provided in communication with the bearing housing 42, and a plurality of screw grooves 67-1 are provided on the inner edge of the washer filling groove 67. The center of the washer filling groove 67 is through hole, and an anti-disengagement washer 65 with a drilled screw hole 65-4 is placed on the edge of the screw groove 67-1. After the screw bolt 66 is inserted through the screw hole 65-1 of the anti-disengagement washer 65, it is screwed and assembled in the screw groove 67-1.

[0079] Figure 8a and Figure 8b This is an example diagram showing another embodiment of the detachable hole-opening device 10-2 for the hole-expanding guide support plate of the present invention, and another embodiment showing the mounting and dismounting device 60 required to connect the hole-expanding guide support plates 50: 50-1, 50-2, 50-3 to the outside of the conical fastener 40.

[0080] Multiple engagement grooves 62 are provided at certain intervals on the outer horizontal center line of the conical fastener 40. At the upper and lower ends of each engagement groove 62, there are connecting grooves 61-1 and 61-2 arranged on a straight line.

[0081] On one side of each snap-fit ​​groove 62, a snap-fit ​​ball receiving chamber 70 is drilled out from the outside of the conical fastener 40 to the snap-fit ​​groove 62, and the front end 71-1 of the snap-fit ​​ball receiving chamber 70 is formed to be smaller than the diameter of the snap-fit ​​ball 72.

[0082] A screw part 71 is provided on the inner periphery of the snap ball storage chamber 70. The snap ball storage chamber 70 is filled with snap balls 72 and helical springs 73 in sequence, and the tension adjusting bolt 74 is screwed in.

[0083] The tension adjusting bolt 74 is screwed in, which not only prevents the locking ball 72 and the coil spring 73 from disengaging, but also allows the spring force of the locking ball 72 and the coil spring 73 to be adjusted by adjusting the tension adjusting bolt 74.

[0084] The following describes the operation (usage state) of the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention, which is formed (configured) as described below.

[0085] The hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention is such that only the conical fastener 40 is assembled on the conical fastener loading rod 30, or as follows: Figures 2 to 8b As shown, it can be used with the enlarged guide support piece 50 attached to the outside of the conical fastener 40.

[0086] Figures 2 to 7b In the example shown, the expansion guide support piece 50 is attached to each snap-fit ​​groove 62 and engagement groove 61-1, 61-2 formed on the outer side of the conical fastener 40. Then the snap-fit ​​protrusion 51 is inserted into the snap-fit ​​groove 62, and the upper and lower front end faces of the snap-fit ​​protrusion 51 are respectively inserted into the engagement groove 61-1, 61-2. Then the expansion guide support piece 50, which is made of metal material, is attracted by the magnetic force of the magnet 64 and remains in a blocked state.

[0087] on the contrary, Figure 8a and Figure 8b The example shown is that when the enlarged hole guide support piece 50 is engaged with the snap-fit ​​grooves 62 and engagement grooves 61-1, 61-2 formed on the outer side of the conical fastener 40, the snap-fit ​​protrusion 51 is inserted into the snap-fit ​​groove 62, and the upper and lower front end faces of the snap-fit ​​protrusion 51 are respectively inserted into the engagement grooves 61-1, 61-2. Preferably, the snap-fit ​​protrusion 51 is inserted into the snap-fit ​​groove 52, that is, it is filled into the snap-fit ​​ball receiving chamber 70, so that the snap-fit ​​ball 72 ejected by the helical spring 73 engages with the snap-fit ​​hole 52, thereby blocking the enlarged hole guide support piece 50.

[0088] In the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention, when only the conical fastener 40 is assembled on the conical fastener loading rod 30, the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention is oriented upwards, so that the conical fastener 40, which is ejected upwards by the conical fastener ejection helical spring 35, is engaged (inserted) into the existing hole 2.

[0089] As described above, with the conical fastener 40 engaged (inserted) into the existing hole 2, the switch of the electric drill 11 is turned on (not shown in detail). The hole-opening body 20 rotates, causing the hole-expanding guide support plate detachable hole-opening device 10-2 to move upward. The rotating hole-opening body 20 then drills out of the ceiling 1 and drills an expanded predetermined hole 3 to the outside of the existing hole 2.

[0090] Moreover, as Figures 2 to 8b As shown in the figure, the hole-expanding guide support detachable hole-opening device 10-2 of the present invention, which is attached to the outer side of the conical fastener 40 with the hole-expanding guide support plate 50, is such that when the size is similar to the size (diameter) of the existing hole 2 drilled on the ceiling 1, the detachable cap 45 for expanding is attached (assembled) to the outer side of the conical fastener 40, so that the pre-expanded hole 3 can be easily drilled.

[0091] With the conical fastener 40 fastened (assembled) with the enlarging guide support pieces 50: 50-1, 50-2, 50-3 on the outside, and the conical fastener 40 with the enlarging guide support pieces 50: 50-1, 50-2, 50-3 fastened (assembled) facing upwards, the enlarging guide support piece detachable opening device 10-2 is as follows. Figure 7a The example given is to be directed upwards, so that the enlarged hole guide support plates 50: 50-1, 50-2, 50-3, which are ejected upwards by the conical fastener ejection coil spring 35 together with the conical fastener 40, are engaged (inserted) into the existing hole 2.

[0092] As described above, with the enlarging guide support plates 50: 50-1, 50-2, and 50-3, which are attached to the outside of the conical fastener 40, engaged (inserted) into the existing hole 2, the switch of the electric drill 11 is turned on (not shown in detail). The drilling body 20 then rotates, as... Figure 7b The example given shows that the hole-expanding guide support plate detachable hole-opening device 10-2 is further upward, and the rotating hole-opening body 20 drills the ceiling 1, thereby drilling an expanded predetermined hole 3 to the outside of the existing hole 2.

[0093] As described above, the hole-expanding guide support plate detachable hole-opening device 10-2 of the present invention facilitates the replacement and assembly of the hole-opening body 20 for existing holes with a diameter larger than that drilled in places such as ceilings. Therefore, it is easy to drill holes with a diameter larger than existing holes. When the hole-expanding guide support plates 50: 50-1, 50-2, 50-3, which are attached to the conical fastener loading rod, are attached (inserted) into the existing drilled holes, an expanded hole can be drilled without shaking. The size (height, width, etc.) of the hole-expanding guide support plates 50: 50-1, 50-2, 50-3 can be varied. Therefore, by selecting the conical fastener assembly according to the size of the existing hole, it is easy to drill holes with a diameter larger than existing holes.

[0094] The above specific embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; those skilled in the art should understand that modifications or changes can still be made to the technical solutions described in the foregoing embodiments; and these modifications or changes do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions described in the embodiments of the present invention.

Claims

1. A hole-opening device with a detachable guide support plate, wherein a front bolt part (16) and a front flywheel (18) are provided on the front end of the drive shaft (12) of the chuck of an electric drill (11). On the lower side of the front flywheel (18), a flywheel nut (19) is screwed onto the drive shaft (12). Multiple connecting rods (19-1) are clamped at certain intervals on the front flywheel (18), so that the lower end is blocked by the front of the flywheel nut (19). The drive shaft is integrally formed on the lower end of the front bolt part (16), which can be screwed onto / separated from the hole-opening body (20). (12) On the upper part of the bolt part (16), the helical spring (15) and the dust-proof cap (25) are sequentially combined. At the upper center of the bolt part (16), the conical fastener loading rod (30) with the screw part (31) at the upper end is integrally formed. On the conical fastener loading rod (30), the conical fastener ejection helical spring (35) and the conical fastener (40) with a narrow upper part and a wide lower part forming a cone shape and a insertion hole (41) passing through the center line are sequentially clamped and combined. The feature is that On the outer side of the conical fastener (40), multiple enlarged hole guide support plates (50) can be loaded and unloaded at certain intervals by means of the loading and unloading device (60); The loading and unloading device (60) that connects the enlarged guide support plates (50: 50-1, 50-2, 50-3) to the outside of the conical fastener (40) adopts one of the following two methods: Method a: On the outside of the conical fastener (40), multiple snap-fit ​​grooves (62) are formed at certain intervals on the horizontal center line. The upper and lower ends of each snap-fit ​​groove (62) have connecting grooves (61-1, 61-2) set on a straight line. A magnet filling groove (63) with a screw groove (63-1) is formed between each snap-fit ​​groove (62) and connecting groove (61-1, 61-2). A disc-shaped magnet (64) is screwed on each magnet filling groove (63) with a screw bolt (64-1). Method b: Multiple snap-fit ​​grooves (62) are formed at certain intervals on the horizontal center line outside the conical fastener (40). The upper and lower ends of each snap-fit ​​groove (62) have connecting grooves (61-1, 61-2) formed on a straight line. On one side of each snap-fit ​​groove (62), a snap-fit ​​ball receiving chamber (70) is drilled from the outside of the conical fastener (40) to the snap-fit ​​groove (62). A screw part (71) is provided on the inner periphery of the snap-fit ​​ball receiving chamber (70). The snap-fit ​​ball (72) and the helical spring (73) are sequentially filled inside the snap-fit ​​ball receiving chamber (70), and the tension adjusting bolt (74) is screwed in.

2. The reaming pilot support blade removable hole cutting device of claim 1, wherein, The enlarged hole guide support piece (50) is formed in an inclined rectangular shape, and its length is the same as or similar to the outer length of the conical fastener (40), with a snap-fit ​​protrusion (51) protruding from the center of the front end face.

3. The hole-opening device with detachable guide support plate according to claim 1, characterized in that, The hole-expanding guide support piece (50) is formed by making the width (W) of the hole-expanding guide support piece (50) into a narrower width (W1), a middle width (W2), and a wider width (W3).

4. The reaming pilot support blade removable hole cutting device of claim 1 wherein, The enlarged hole guide support plate (50) is formed from metal products or synthetic resin products.

5. The reaming pilot support blade removable hole cutting device of claim 1 wherein, The upper end face of the conical fastener (40) is also fitted with an anti-disengagement washer (65).

6. The reaming pilot support blade removable drilling apparatus of claim 2, wherein, The enlarged hole guide support piece (50) has a snap-fit ​​hole (52) formed on the snap-fit ​​protrusion (51) formed in the center of the front end face, which also has a transverse through hole.

7. The reaming pilot support blade removable drilling apparatus of claim 1 wherein, In method a, the engagement groove (62) and the mating groove (61-1, 61-2) formed on the conical fastener (40) are such that the engagement groove (62) is formed deeper than the mating groove (61-1, 61-2).

8. The reaming pilot support blade removable drilling apparatus of claim 5, wherein, In method b, the anti-disengagement washer (65) also mounted on the upper end face of the conical fastener (40) is formed on the upper end face of the conical fastener (40) such that the washer filling groove (67) communicates with the bearing housing (42), and the anti-disengagement washer (65) with the central through hole is screwed and assembled on the washer filling groove (67) with a screw bolt (66).

9. The reaming pilot support blade removable drilling apparatus of claim 1 wherein, The snap ball receiving chamber (70), which is drilled from the outside of the conical fastener (40) to the snap groove (62), is formed with the front end (71-1) of the snap ball receiving chamber (70) being smaller than the diameter of the snap ball (72).

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