TWM583367U - Hole-drilling saw - Google Patents

Abstract

This creative department provides a screw hole saw, which includes a shaft part, the top end of which is inserted into a rotary tool, and a drill core fixed on the bottom end, and a set of holes on the shaft part; A pair of cutting members are symmetrically connected to each other and fixed to both ends of the crossbar; each cutting member is provided with a fixing block and a combination fixed to the fixing. The cutting blades of the block, the pair of fixed blocks are fixed at both ends of the crossbar in combination, and the axial distance between the pair of cutting blades and the shaft is equal.

Description

Hole saw

This creation relates to a rotary hole saw, in particular to a revealer of the innovative structure of a fixed double-cutting blade.

According to the structure of the conventional rotary hole saw, the cutting blade is generally made of tungsten steel, which is easy to passivate, wear and break during drilling. Therefore, most of the conventional rotary hole saws adopt adjustable design to facilitate adjustment after changing the cutting blade. And correction.

For example, the improved structure of the rotary hole saw of the Republic of China Patent Publication No. 405464 (2), which is based on the sliding displacement of the two sliders on the ruler rod, and then the two-cut blade is adjusted to the required distance; When the slider is moved to the required scale position, the long slot at the top of the slider is locked with a bolt, forcing the through hole of the slider to fit tightly on the ruler rod; however, this structure design The disadvantage is that the slider will slightly slip due to the force of the locking process, which will cause adjustment errors, and it will be fixed by pressing, which is easy to produce looseness or even offset during drilling, which will affect the Due to its round hole accuracy, it has the disadvantages of difficult adjustment and poor drilling accuracy.

In addition, such as the rotary hole saw (commonly known as Hole Saw) of the Republic of China Patent Publication No. 560411, which uses a cup-shaped circular saw to drill the plate, without adjustment and correction, the user only needs to The required specifications can be directly drilled; however, after this type of rotary hole saw is used to cut the plate, the drill core will cause the cut scraps to jam against the core and the circular saw due to chipping, which will cause waste. The chips are difficult to remove, and users need to use other tools to assist in removing them (for example: inserting them with a flat-bladed screwdriver to remove them).

The main purpose of this creation is to provide a rotary hole saw. The technical problem it wants to solve is to make an innovative breakthrough on how to develop a new type of structure with more ideal practicability.

Based on the foregoing object, the present invention provides a rotary hole saw, which includes: a shaft portion, a top portion of which is provided with a plug-in portion for being inserted into a chuck of a rotary tool to be rotated, and a bottom end is inserted through A drill core is fixedly installed, and the shaft portion is provided with a set hole penetrating the shaft portion in a radial direction; a cross bar is penetrated and fixed in the set hole of the shaft portion, and two ends of the cross bar are respectively A connecting portion is provided; a pair of cutting members are symmetrical to each other and are respectively fixedly fixed to both ends of the cross bar; each cutting member has a fixed block and a cutting blade fixedly fixed to the fixed block; the fixed block An assembling part capable of being combined and fixed to the connecting part is provided, and the axial distance between the pair of cutting blades and the shaft part is equal.

Another purpose of this creation is to provide an elastic auxiliary element at the bottom end of the shaft to increase the balance and stability during drilling.

Please refer to Figs. 1, 2, 3, and 4 for the preferred embodiments of the creative rotary hole saw. However, these embodiments are for illustration only and are not limited by this structure in patent applications.

The screw hole saw includes: a shaft part 10, a top part of which is provided with a plug-in part 11 for being inserted into a chuck of a rotary tool so as to be rotatable, and a bottom end of which is provided with a drill core 12, And the shaft portion 10 is provided with a set hole 13 penetrating the shaft portion 10 in a radial direction; a cross bar 20 is penetrated and fixed in the set hole 13 of the shaft portion 10, and two of the cross bar 20 The ends are respectively provided with a connecting portion 21; and a pair of cutting members 30, which are symmetrical to each other and are respectively fixedly fixed to both ends of the crossbar 20; each cutting member 30 has a fixing block 31 and a fixedly fixed to the The cutting blade 32 of the fixed block 31 is provided with an assembly portion 310 that can be fixedly fixed to the connecting portion 21, and the axial distance between the pair of cutting blades 32 and the shaft portion 10 is equal (as shown in FIG. 3). It is shown that the axial distance between the pair of cutting blades 32 and the shaft portion 10 is a predetermined length L).

In this example, the set of holes 13 is a square hole, and the cross section of the crossbar 20 corresponds to the quadrangle of the set of holes 13, so that the crossbar 20 can increase the contact area when the set of holes 13 Make it more stable.

In use, the above-mentioned rotary hole saw is first inserted into the chuck of a rotary tool (such as an electric drill) and rotated, and then the core 12 is drilled into the plate to be sawed. The center of the circle is maintained, and the cutting blades 32 fixed to the two ends of the cross bar 20 are rotated around the outer periphery of the core 12 to drill the plate into circular holes.

As shown in FIG. 2, in this example, an outer surface of the shaft portion 10 is provided with a positioning screw hole 14 and a positioning member 15, and a middle portion of the crossbar 20 is provided with a positioning groove 22; the positioning screw hole 14 is Connected to the group of setting holes 13, the positioning member 15 is screwed in the positioning screw hole 14 and extends into the group of setting holes 13, and one end of the positioning member 15 abuts against the positioning groove 22 by The screw lock of the positioning member 15 enables the one end of the positioning groove 22 to be pressed tightly, thereby fixing the cross bar 20 to be positioned so that both ends are equidistant from the axis of the shaft portion 10.

As shown in FIG. 2, in this example, each connection portion 21 is provided with a through hole 211 and a fastener 212, and the assembly portion 310 of each fixing block 31 has a groove 311 and a groove provided in the groove. The screw holes 312 on the bottom surface of 311, the pair of grooves 311 are respectively sleeved on the two ends of the crossbar 20, and the screw holes 312 are corresponding to the through holes 211 of the connecting portion 21, and the lock member 212 is provided on the The through hole 211 is screwed to the screw hole 312, so that the fixing block 31 is fixed to both ends of the cross bar 20. In practice, the connecting part 21 and the assembling part 310 can also be fixed through different types of structural changes, and are not limited to the above-mentioned design (the combination of the two structures is changed to a common technology, which is not described in detail here).

The cutting blade 32 can be fixed to the side of the fixing block 31 by screwing or welding. The material of the cutting blade 32 is a polycrystalline diamond, which has the advantages of good cutting ability and is not easy to wear. In addition, due to the polycrystalline The drill has high hardness and is not easy to be damaged. The cutting blade 32 has a relatively long service life in use and can be used for a long time without replacement. Therefore, under the consideration of no need to change the tool, in addition to the detachable screw lock combination, Can be combined by welding or other non-removable methods.

The screw hole saw also includes an elastic auxiliary element 40, which is a spring, which is provided at the bottom end of the shaft portion 10. The elastic auxiliary element 40 has a first end 41 and a second The end 42 is provided at the bottom end of the shaft portion 10, and the outer diameter of the elastic auxiliary element 40 is gradually expanded from the first end 41 to the second end 42.

As shown in Figs. 2 and 3, in this example, the shaft portion 10 is provided with a pressing member 16 radially, and the pressing member 16 is screwed on the shaft portion 10, and one end of the shaft portion 10 One end of the drill core 12 protrudes slightly from the outer surface of the shaft portion 10 for the elastic auxiliary element 40 to engage with to avoid detachment from the shaft portion 10.

As shown in FIG. 4, it is the second embodiment of the present creation, wherein the outer surface of the shaft portion 10 is provided with an engaging positioning portion 17 adjacent to the bottom end of the shaft portion 10. For the elastic auxiliary element 40 to be engaged and positioned; in this example, the engaging positioning portion 17 is annularly provided in a recessed portion on the outer surface of the shaft portion 10, and the width of the recessed portion is substantially equal to the spring (the elastic auxiliary element 40 ) Coil diameter, so that the coil of the spring can be engaged in the recess; of course, the engaging positioning portion 17 can also be changed in design to a convex portion looped around the outer surface of the shaft portion 10, which can also make the elastic auxiliary The component 40 is engaged and fixed (not shown).

As shown in FIG. 5, which is the third embodiment of the present creation, the rotary hole saw is further provided with a dust collecting hood 50. The dust collecting hood 50 has a closed end 51, an open end 52, and a receiving space 53. The closed end 51 forms a plurality of receiving grooves, and a center of the closed end 51 is provided with a perforation 54; the shaft portion 10 is pivotally disposed on the perforation 54; and the crossbar 20 and the pair of cutting members 30 are located in the accommodation. In the space 53, the dust collecting hood 50 can receive the generated chips during the drilling of the rotary saw, so as to avoid falling or raising and falling into the eyes of the user.

Based on the above structure composition type and technical characteristics, the operation of the use of this creation is described as follows: As shown in FIG. 6, when the core 12 is drilled into a plate 70 to be sawed, the elastic auxiliary element The 40 is contracted under pressure, so that the elastic force of the elastic auxiliary element 40 abuts against the plate 70, improves the stability during processing, and uses the large outer diameter of the second end 42 to adhere to the plate 70. Come up to increase the overall balance, and when the rotary hole saw cuts a circular hole in the plate 70, the elastic force of the elastic auxiliary element 40 can push the cut waste chips out of the circular hole; more specifically, this In the structural design of the created drill core 12, the outer diameter close to the drill tip is smaller than the outer diameter of the drill body, that is, the thinner design of the front end is used to avoid waste caused by chipping of the drill core 12 after drilling round holes. The problem that the chips are not easy to take out, of course, by using the elastic force design of the elastic auxiliary element 40, the waste chips can be actively withdrawn.

In addition, in the production of the rotary hole saw of this creation, the material of the slicer 32 is a polycrystalline diamond with a cutting ability much higher than that of tungsten steel, and the cutting blade 32 is directly fixed at both ends of the crossbar 20, and Can be made into a variety of sizes (that is, the change in the axial distance between the pair of cutting blades 32 and the shaft portion 10), so that when the user operates, he can simply select the required size to directly drill, which is equivalent in use. Convenient, at the same time, it can eliminate the time of adjustment and correction, effectively increase the work efficiency, and the fixing block 31 is fixed to the crossbar 20 by means of a screw lock, which can effectively solve the problem that the conventional adjustable rotary saw is easy to produce during drilling The problem of looseness or even deviation.

10‧‧‧ Shaft

11‧‧‧ Plugging Department

12‧‧‧ core

13‧‧‧ set holes

14‧‧‧ positioning screw holes

15‧‧‧ Positioning piece

16‧‧‧ Urgent

17‧‧‧ Engagement and positioning section

20‧‧‧cross bar

21‧‧‧ Connection Department

2111‧‧‧through hole

212‧‧‧Lock Firmware

22‧‧‧ positioning groove

30‧‧‧ cutting member

31‧‧‧Fixed block

310‧‧‧Assembly Department

311‧‧‧groove

312‧‧‧Screw holes

32‧‧‧ cutting blade

40‧‧‧ Elastic auxiliary components

41‧‧‧ the first end

42‧‧‧ second end

50‧‧‧ dust collecting hood

51 · ‧‧ closed end

52‧‧‧ open end

53‧‧‧accommodating space

54‧‧‧ perforation

70‧‧‧ plates

L‧‧‧ predetermined length

Figure 1 is a combined perspective view of a preferred embodiment of the present invention.
Figure 2 is an exploded perspective view of a preferred embodiment of the present invention.
FIG. 3 is a front view of the preferred embodiment of the present invention.
FIG. 4 is an exploded perspective view of the second embodiment of this creation.
FIG. 5 is an exploded perspective view of the third embodiment of the present invention.
FIG. 6 is a partial cross-sectional view of the third embodiment of the present invention.

Claims (8)

A screw hole saw includes: a shaft portion, a plug portion is provided at a top end thereof for being inserted into a chuck of a rotary tool so as to be capable of being rotated, and a drill core is fixedly inserted through the bottom end, and the shaft The section is provided with a set hole penetrating through the shaft portion in the radial direction; a cross bar is passed through the set hole fixed in the shaft portion, and two ends of the cross bar are provided with a connecting portion respectively; Cutting members are symmetrical to each other and are respectively fixed on both ends of the cross bar; each cutting member has a fixed block and a cutting blade fixedly fixed to the fixed block, and the fixed block is provided with a fixed and fixed An assembly portion of the connecting portion, and an axial distance between the pair of cutting blades and the shaft portion are equal. According to the rotary hole saw described in item 1 of the scope of patent application, wherein each connecting portion is provided with a through hole and a locking member, the assembly portion of each fixing block has a groove and a groove provided on the bottom surface of the groove. Screw holes, the pair of grooves are respectively sleeved at the two ends of the crossbar, and the screw holes are corresponding to the through holes of the connecting portion, and the locking member is penetrated through the through holes and screwed to the screw holes And the fixing block is fixed on the cross bar in combination. The rotary hole saw according to item 1 or 2 of the scope of patent application, wherein the cutting blade is fixed on the fixing block in a screw lock manner. The rotary hole saw according to item 1 of the scope of patent application, wherein the rotary hole saw is further provided with an elastic auxiliary element, and the elastic auxiliary element is provided at the bottom end of the shaft portion. The rotary hole saw according to item 4 of the scope of patent application, wherein the elastic auxiliary element has a first end and a second end, the first end is provided at the bottom end of the shaft portion, and the elastic auxiliary element The outer diameter gradually increases from the first end to the second end. The rotary hole saw according to item 4 of the scope of patent application, wherein the shaft portion is provided with a pressing member radially, and the pressing member is screwed on the shaft portion. One end of the pressing member is used for pressing. To the drill core, and the other end protrudes slightly from the outer surface of the shaft for the elastic auxiliary element to engage. The rotary hole saw according to item 4 of the scope of patent application, wherein the outer surface of the shaft portion is provided with a snap-in positioning portion, and the snap-in positioning portion is adjacent to the bottom end of the shaft portion for the elastic auxiliary component. Snap-in positioning. The rotary hole saw according to item 1 of the scope of patent application, wherein the outer surface of the shaft portion is provided with a positioning screw hole and a positioning member, and the middle portion of the crossbar is provided with a positioning groove; the positioning screw hole is connected to The set of holes is screwed into the set screw holes and extends into the set of holes, and one end of the set is pressed against the positioning groove.