KR20170002344U

KR20170002344U - Drill bit structure

Info

Publication number: KR20170002344U
Application number: KR2020150008425U
Authority: KR
Inventors: 김만종
Original assignee: 김만종
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2017-06-30

Abstract

The drill bit structure of the present invention comprises a drill bit having a plurality of cut bits formed therein for drilling at its tip; A shaft extending integrally from the drill bit and having at least two or more helical portions, the helical portion having spiral grooves formed from the first and second end surfaces and the ribs extending at equal pitches between the grooves; An intermediate member having a large-diameter cylindrical area extending integrally with the shaft; And a shank which is formed integrally with the center of the area portion and extends integrally from the intermediate member and has a length portion which is integrally coupled to the center portion and which is adjacent to the end portion and has a plurality of grooves for engaging with the chuck of the drill bit tool, Strong anchor bolts are assembled smoothly.

Description

[0001] DRILL BIT STRUCTURE [0002]

The present invention relates to a drill bit, in particular by fixing the length of a drill bit, precisely adjusting the drilling depth, inserting a strong inserted in a perforated area, positioning an anchor bolt in a strong and precisely striking an anchor bolt assembly, To a drill bit structure for assembling a support of a desired object.

Generally, a drill bit is used to insert a drill tool for drilling an anchor bolt into a workpiece such as a ceiling of a concrete structure, a building outer wall, a road separator, or the like. Usually, a drill bit is a form in which a cutting edge of a cemented carbide material having excellent abrasion resistance is fixed to a tip end by a method such as soldering or welding.

A conventional drill bit has a bit equipped with a separate cutting edge at its tip; A lip portion projecting along a groove portion and a spiral groove portion for chip discharge and coolant supply; And drill chucks of other drill tools.

When the drive motor mounted on the other drill tool rotates at a high speed, the drill bit connected to the drive motor rotates the drum at one end of the drill bit, and at the same time, the cutting edge mounted on the tip of the bit is rotated at a high speed, The strong anchor set is assembled by inserting the strong hole in the predetermined position of the water, inserting the strong hole, inserting the anchor bolt and hitting the lower end of the anchor bolt by using a separate striking device to assemble the strong anchor set so that the predetermined structure is suspended .

However, since such a drill bit must use a drill bit tool for drilling a hole for stall insertion and a tool for hitting an anchor bolt for drilling anchor bolt, There is a problem that the operation cost is increased.

A composite drill bit has been disclosed in Korean Patent Laid-Open Publication No. 10-2012-0052093 (May 23, 2012), which is a representative prior art technique. As shown in FIG. 1, A lead portion 5 provided with a helical groove 5a for chip ejection and a handle portion 7 fitted and fixed to a drill bit chuck (not shown) And the striking portion 1 is provided with a striking ring 9, a spiral portion 8, and a striking portion 1, which is positioned between the lead portion 5 and the stalk portion 7, And a latching jaw (2), and is positioned between the lead part (5) and the bag part (7) and is screwed and separated.

This drill bit has a drill bit function to drill a hole for anchor bolt insertion and a hitting function to hitting the bottom of an anchor bolt in a hole so that a series of work processes can be simplified to improve work efficiency and reduce waste of work cost do.

However, this drill bit requires a very skilled worker to drill holes in accordance with Strong's insertion length when the length of the Strong is normalized and the Strong's anchor bolt is installed. Otherwise, a considerable working time . In addition, the striking part is struck by the use for a long time in a state where the striking ring is engaged with the spiral part, and the coupling between the striking ring and the striking part is destroyed.

The object of the present invention is to provide a drill bit structure for accurately fixing the length of a drill bit to precisely adjust the drilling depth, to position a strong inserted in a perforated part, and to securely fasten the strong anchor assembly by accurately striking an anchor bolt There is.

Another object of the present invention is to provide a drill bit having a shaft that coincides with a drill bit depth to a depth of a strong length, and a cutting portion extending from a spiral-shaped recessed portion of the shaft is formed diagonally so that chip and cutting oil can be supplied, A drill bit structure in which an intermediate member composed of a shaft serving as a striking portion of the drill bit tool and an extension portion integrally connected to the shank is formed.

The drill bit structure according to the present invention includes a drill bit having a plurality of cut bits for drilling at its tip;

A shaft extending integrally from the drill bit and having at least two or more helical portions, the helical portion having spiral grooves formed from the first and second end surfaces and the ribs extending at equal pitches between the grooves;

An intermediate member having a large-diameter cylindrical area extending integrally with the shaft;

And a shank which is formed integrally with the center of the area portion and extends integrally from the intermediate member, and is formed with a plurality of grooves adjacent to the end portions thereof, the grooves being engaged with the chuck of the drill bit tool.

The drill bit has first and second main cutting bits protruding from the center connecting portion in a large angle in the rotational direction and having a small inclined face on the opposite side and protrudingly formed adjacent to the central connecting portion and smaller than the first and second main cutting bits First and second sub-cut bits having a large slope in the rotation direction and a small slope in the opposite side are protruded.

A first end face for feeding and chip discharging is formed between the steeply sloping face of the first main cutting bit and the small inclined face of the minor cutting bit, And a second end face for chip discharge are formed.

The area portion formed integrally between the shaft and the shank in the intermediate member has a bifurcated cutout portion formed along the diameter line of the area portion along the slope of the bottom surface of the groove of the shaft and along the cross section of the lip on one side of the groove.

The present invention is constructed in such a way that the intermediate member is integrally formed between the shaft and the shank, and the length of the stallion to be installed is precisely determined and the reliability according to the anchor bolt striking is improved. .

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention, a brief description of the drawings is provided below.
1 is an exploded perspective view showing a conventional technique,
FIG. 2 is a perspective view showing the entire drill bit structure according to the present invention,
3 is a cross-sectional view showing the tip of a drill bit of the drill bit structure according to the present invention.

This design will be described in detail based on the attached drawings as follows. 2 and 3, the drill bit structure 10 according to the present invention includes a drill bit 20 having a plurality of cut bits for drilling at its tip, An intermediate member 40 having a large diameter, and shanks 50 extending integrally from the intermediate member 40 and inserted in the drill bit tool.

As shown in FIG. 2, the drill bit 20 includes first and second main cutting bits 11 and 11 ', which are sloped in the rotational direction with respect to the upper center connecting portion 12 and have a smaller sloped surface on the opposite side The first and second sub-cuts, which are protruded and are adjacent to the central connecting portion 12 and which are sloped at a height smaller than the first and second main cutting bits 11 and 11 'in the rotating direction, The bits 13 and 13 'are protruded. A first end face 14 for supplying and discharging chips is formed between the steeply inclined face of the first main cutting bit 11 and the small inclined face of the minor cut bit 13, A second end face 14 'for supplying oil and discharging chips is formed between the small inclined faces of the first and second cut bits 13'.

Therefore, the drill bit 20 facilitates the drilling operation and the chip discharge is achieved through the smooth supply of oil through the first and second end faces 14, 14 'and through the groove described hereinafter.

The shaft 30 is integrally connected to the drill bit 20 and has at least two or more helical spiral portions 23 which are spirally formed from the first and second end faces 14, (21) are formed and the ribs (22) extend at the same pitch between the grooves (21).

The intermediate member 40 has an area 31 between the shaft 30 and the shank 50 that is enlarged to a diameter greater than their diameter. The area section 31 has a cylindrical shape with a predetermined height and is formed on the diameter line thereof with a sloped cutout portion 33 having the same slope along the bottom face of the groove 21 of the shaft 30 and the cross- . The cutout portion 33 is cut along the inclination of the groove 21 so that the concrete is punctured by the area portion 31 up to the length of the shaft 30 by the drill bit 20, Drain and let the oil supply work. These functions are very important for a series of tasks in the field.

The shank 50 is formed by a length portion 41 integrally joined to the center of the area portion 31 of the intermediate member 40 and has a plurality Grooves 42 are formed.

10: Drill bit structure 11: Drill bit
11, 11 ': first and second main cutting bits
13, 13 ': first and second division bits
14, 14 ': first and second cross section 20: drill bit
21: groove 22: lip
30: shaft 31:
33: cut-out portion 40: intermediate member
50: Shank

Claims

In the drill bit structure,
A drill bit having a plurality of cut bits for drilling at its tip;
A shaft extending integrally from the drill bit and having at least two or more helical portions, the helical portion having spiral grooves formed from the first and second end surfaces and the ribs extending at equal pitches between the grooves;
An intermediate member having a large-diameter cylindrical area extending integrally with the shaft;
And a shank which is formed integrally with the center of the area portion and extends integrally from the intermediate member, and which is formed with a plurality of grooves which are adjacent to the end portions thereof and engage with the chuck of the drill bit tool.

The method according to claim 1,
The drill bit has first and second main cutting bits protruding from the center connecting portion in a large angle in the rotational direction and having a small inclined face on the opposite side and protrudingly formed adjacent to the central connecting portion and smaller than the first and second main cutting bits And the first and second sub-cut bits are protruded and formed into a large inclined face in the rotational direction and a small inclined face in the opposite face.

The method according to claim 1,
A first end face for feeding and chip discharging is formed between the steeply sloping face of the first main cutting bit and the small inclined face of the minor cutting bit, And a second end face for chip discharge.

The method according to claim 1,
Characterized in that an area portion formed integrally between the shaft and the shank in the intermediate member is formed with a bifurcated cutout portion along the diameter line of the area portion along the slope of the bottom surface of the groove of the shaft and the cross- .