CN2552480Y

CN2552480Y - Bone drill

Info

Publication number: CN2552480Y
Application number: CN 02218165
Authority: CN
Inventors: 黄志海
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2003-05-28
Anticipated expiration: 2012-06-11

Abstract

The utility model discloses a self-tapping bit, which comprises a connecting section, a bit body and a pointed nose; wherein a flute is arranged on the bit body, and thread is tapped on the outer surface of the bit body. The utility model has the advantages that while in drilling, greater pressure is unnecessary, and the stability to hold the electric drill for the operator is enhanced; the swing of the bit is small, and the drilled passage is uniform and without loosening, so the failure of screw fixation is eliminated; the speed of the bit is uniform, so the suspension of bit is effectively controlled, and damage caused by inbursting into surrounding tissue are prevented; thick and distant thread with bigger diameter is tapped on the bit body, and the bit taps while in drilling, so bolts can easily and directly plug into the drilled hole.

Description

The self tapping drill bit

Technical field

This utility model relates to a kind of drill bit that is used with electric drill, especially the self tapping drill bit of medical surgery operation usefulness.

Background technology

When carrying out drilling operation, operator generally sensation can run into bigger resistance to drill bit, needs the operator with bigger pressure to hard objects (as the intravital skeleton of people in the medical surgery operation etc.) being used for, and is especially all the more so during the drill bit rust.Simultaneously, when drill bit was broken through the offside cortical bone, because of this resistance suddenly disappears, and applied pressure can not in time return and removes, and drill bit can be charged into the place ahead and cause tissue injurys such as blood vessel, nerve.In addition, need apply pressure greatly during because of boring, it is unstable to cause that easily electric drill grips, and the duct that gets out like this is just inhomogeneous, thereby causes the fixing loosening even inefficacy of screw.

Summary of the invention

Technical problem to be solved in the utility model need not to apply big pressure when being to propose a kind of boring, can effectively control the advancing of drill bit, can stably get out the self tapping drill bit in even duct, thereby avoids charging into the damage that surrounding tissue causes because of drill bit in the operating process.

For solving the problems of the technologies described above, this utility model self tapping drill bit comprises drill bit linkage section, drill body and drill bit tip, is provided with chip area on drill body, has attacked screw thread on the outer surface of drill body.

Above-mentioned self tapping drill bit, the base diameter of drill bit tip is identical with drill body, attacks shallow and close fine thread on the drill body outer surface.

Above-mentioned self tapping drill bit, the diameter of drill bit tip is less, attacks fine and closely woven and screw thread that diameter is bigger on the drill body outer surface.

Above-mentioned self tapping drill bit, the diameter of drill bit tip is less, attacks careless relatively on the drill body outer surface and the bigger screw thread of diameter.

This utility model makes drill bit energy tap out after piercing object owing to attacked screw thread on the outer surface of drill body, and these screw threads can bear part even the whole resistance that produces in the drill bit traveling process, and the operator just need not apply bigger pressure when operation.According to the pitch of screw thread on the drill body, drill bit can be advanced under even velocity, and a kind of breakthrough sense of gentleness is arranged, therefore can control stopping of drill bit effectively, do not cause damage thereby can not charge into surrounding tissue.Because of need not to apply bigger pressure, so just increased the stability that grips electric drill during operation, the drill bit swing is little, and drill bit advances and carry out according to screw thread, and the even non-loosening in the duct that gets out can not cause the fixed inefficacy of screw.Attack careless on the drill body and behind the screw thread that diameter is bigger, can be in the hole internal tapping in boring, so just direct drivescrew is very convenient.

Description of drawings

Fig. 1 is the structural representation of first kind of embodiment of this utility model automatic drill;

Fig. 2 is the structural representation of the another kind of embodiment of the automatic drill bit of this utility model;

Fig. 3 is the structural representation of automatic the third embodiment of drill bit of this utility model.

The specific embodiment

As shown in Figure 1, the self tapping drill bit comprises drill body 1, drill bit tip 2 and cylindrical drill linkage section 3, and cylindrical drill linkage section 3 is in order to link to each other with drill body during use.Drill body 1 is a spiral bit, which is provided with helical form chip area 4, has attacked screw thread on the outer surface of drill body 1.Helical form chip area 4 intersects with screw thread on drill body 1 outer surface and has formed two helical forms saw swords 5, the enlarged-diameter in the hole that drill bit tip 2 can be got out to the size of the corresponding size of major diameter of thread.The diameter of drill bit tip 2 bottoms is identical with drill body 1, attacks shallow and close fine thread on drill body 1 outer surface.The gait of march of this drill bit is slow and keep suitable self tapping power, and drill bit tip diameter is bigger, can bear bigger stress, and the fracture chance is less.But need after the boring in addition tapping to be carried out in the hole, so that squeeze into hold-down screw.

Self tapping drill bit shown in Figure 2, the diameter of its drill bit tip 2 is less, attacks fine and closely woven and screw thread that diameter is bigger on drill body 1 outer surface.Like this, little at same pressure, the penetration rate of this drill bit is fast, adds bigger screw diameter, and self tapping power is strengthened greatly, and the screw thread on the cortical bone also is difficult for strand and falls.

Self tapping drill bit shown in Figure 3, the diameter of its drill bit tip 2 is also less, attacks careless relatively and the bigger screw thread of diameter on drill body 1 outer surface.This just makes speeding up of bit bore, and tapping can be directly in order to the screw thread of drivescrew, and is very convenient.

Claims

1, self tapping drill bit comprises drill bit linkage section, drill body and drill bit tip, is provided with chip area on described drill body, it is characterized in that, has attacked screw thread on the outer surface of described drill body.

2, self tapping drill bit as claimed in claim 1 is characterized in that, the base diameter of described drill bit tip is identical with described drill body, attacks shallow and close fine thread on described drill body outer surface.

3, self tapping drill bit as claimed in claim 1 is characterized in that, the diameter of described drill bit tip is less, attacks fine and closely woven and screw thread that diameter is bigger on described drill body outer surface.

4, self tapping drill bit as claimed in claim 1 is characterized in that, the diameter of described drill bit tip is less, attacks careless relatively and the bigger screw thread of diameter on described drill body outer surface.

5, as claim 1,2,3 or 4 described self tapping drill bits, it is characterized in that the chip area of offering on the described drill body is the helical form chip area, the screw thread on described helical form chip area and the described drill body outer surface intersects two helical forms saws of formation swords.