CN201474611U

CN201474611U - Hole dilating drill

Info

Publication number: CN201474611U
Application number: CN200920231894XU
Authority: CN
Inventors: 朱国强
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-09
Filing date: 2009-09-09
Publication date: 2010-05-19
Anticipated expiration: 2019-09-09

Abstract

The utility model relates to a hole dilating drill, which belongs to the technical field of hardware tools, wherein the drill comprises a drill handle whose end head is provided with drill edge, the tail end of the drill handle is provided with a clamping structure, the middle portion of the drill handle is provided with a spherical bulge, a position shoulder is arranged between the spherical bulge and the tail end, and the maximum outer diameter of the spherical bulge is smaller than the maximum outer diameter of the drill edge. In use, the hole dilating drill firstly drills straight holes like a common drill, and leads the spherical bulge to enter the holes, then shakes the tail end of the drill handle through using the spherical bulge as a lever fulcrum, thereby enlarging the hole bottom through the drill edge. Obviously, the hole dilating drill has simple structure, convenient operation and economical cost.

Description

Reaming bit

Technical field

The utility model relates to a kind of drill bit that is mainly used in the finishing building trade, and especially a kind of reaming bit belongs to the hardware ﹠ tools technical field.

Background technology

The finishing building trade is different with conventional hole to the requirement of the prebored hole of the crab-bolt of packing into, in order to guarantee to have enough tension pulls out force after crab-bolt is packed into, requires diameter at the bottom of the hole greater than the aperture.

In order to realize above-mentioned functions, understand according to the applicant, existing reamer bit structure complexity, price higher (for example application number is that the disclosed drill bit of 2008201230640 Chinese patents promptly is like this) therefore is difficult to satisfy the actual demand of finishing building trade.

The utility model content

The purpose of this utility model is: propose a kind of simple in structure, easy to operate reaming bit, thereby satisfy the actual demand of finishing building trade.

In order to reach above purpose, the utility model reaming bit contains the drillstock that the termination has drill lip, the tail end of described drillstock has clamp structure, the middle part of described drillstock has ball bumps, have locating shoulder between described ball bumps and the described tail end, the maximum outside diameter of described ball bumps is less than the maximum outside diameter of drill lip.

During use, as common drill bit, get out straight hole earlier, and ball bumps is entered in the hole.Be balance pivot then, shake the drillstock tail end, thereby enlarge at the bottom of making drill lip with the hole with the ball bumps.Obviously it is simple in structure, easy to operate, and cost economy.

The utility model further improves, and kink has limiting gasket between described ball bumps and the locating shoulder, thereby cooperates with locating shoulder, has reliable axial location when shaking the drillstock tail end, reduces the corrupted in aperture.

It is that described limiting gasket forms recess and the curved protrusion that matches respectively with the corresponding contact site of described positioning convex that the utility model further improves.Can when shaking the drillstock tail end, not only have reliable location like this, and make drill lip have the movement locus of stable ideal, thereby guarantee the reaming quality.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of the utility model embodiment one.

Fig. 2 is the structural representation of the utility model embodiment two.

The specific embodiment

Embodiment one

The reaming bit of present embodiment as shown in Figure 1, the termination of drillstock 8 leading portions 4 has the drillstock of the carbide alloy drill lip 1 of welding, this termination is made of positive cone section 2 and inverted cone segment thereafter 3 foremost.The tail end of drillstock 8 has the flat horizontal surface 9 as clamp structure.The middle part of drillstock 8 has ball bumps 5, and the maximum outside diameter of ball bumps 5 is less than the maximum outside diameter of drill lip 1.Has locating shoulder 7 between ball bumps 5 and the tail end, kink has limiting gasket 7 between ball bumps 5 and the locating shoulder 7, this limiting gasket is conical (as the special case of curved protrusion) with positioning convex 6 corresponding contacts site, be convenient to ball bumps and when shaking the drillstock tail end, cooperate axial location, reduce the corrupted in aperture with locating shoulder.

During use, getting out straight hole earlier, ball bumps is entered in the hole, is balance pivot with the ball bumps again, shakes the drillstock tail end, enlarges at the bottom of making drill lip with the hole.

Embodiment two

The reaming bit of present embodiment as shown in Figure 2, basic structure is identical with embodiment one, difference is that limiting gasket 6 forms recess and the curved protrusion that matches respectively with positioning convex 7 corresponding contacts site, be specially limiting gasket 6 and form the concentric spherical surface hill of the centers of circle and ball bumps 5, and the concentric ball-and-socket of the corresponding contact site formation of positioning convex 7 and ball bumps 5.Can when shaking the drillstock tail end, both locate reliably like this, guarantee again that drill lip is to move along stable arc track in the center with the ball bumps center of circle, expanded at the bottom of the reverse taper hole that regular shape.

In addition to the implementation, the utility model can also have other embodiments.For example, also can limiting gasket 6 form the concentric ball-and-socket of the centers of circle and ball bumps 5, and the concentric ball bumps of the corresponding contact site formation of positioning convex 7 and ball bumps 5; Limiting gasket and the corresponding contact site of positioning convex also can form the projection and the recess of other required curve in addition; For another example, drill lip can be an in-line, also can be cross; Or the like.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims

1. reaming bit, contain the drillstock that the termination has drill lip, the tail end of described drillstock has clamp structure, it is characterized in that: the middle part of described drillstock has ball bumps, have locating shoulder between described ball bumps and the described tail end, the maximum outside diameter of described ball bumps is less than the maximum outside diameter of drill lip.

2. reaming bit according to claim 1 is characterized in that: kink has limiting gasket between described ball bumps and the locating shoulder.

3. reaming bit according to claim 2 is characterized in that: the corresponding contact site with positioning convex of described limiting gasket is for conical.

4. reaming bit according to claim 2 is characterized in that: described limiting gasket forms recess and the curved protrusion that matches respectively with the corresponding contact site of described positioning convex.

5. reaming bit according to claim 4 is characterized in that: described limiting gasket forms the center of circle spherical surface hill concentric with ball bumps, and the corresponding contact site of described positioning convex forms the ball-and-socket concentric with ball bumps.

6. reaming bit according to claim 4 is characterized in that: described limiting gasket forms the center of circle ball-and-socket concentric with ball bumps, and the corresponding contact site of described positioning convex forms the ball bumps concentric with ball bumps.