Prevent the curved electric drill of drill bitTechnical field
The present invention relates to hand held electric tool technical field, more particularly, to preventing the curved electric drill of drill bit.
Background technique
Electric drill is the drilling machine that power is done using electricity, is the conventional products in electric tool, and have the callElectric tool class product, is generally divided into electric hand drill, impact drill and hammer drill.When drilling, due to the needs of punching, many feelingsAll be to carry out operation using not only thin but also long drill bit under condition, at present the electric drill of market for this drill bit using when have following askTopic: 1, the length of the bit is too long is inconvenient to the angle punched positioning, and being easy, which cuts drill bit, tiltedly deflects；2, since the length of the bit is too long,Can have that drill bit is curved to be happened when holding out against punching, the poor drill bit of some intensity can even have the risk of fracture.
Summary of the invention
In view of the deficiencies of the prior art, present invention offer prevents the curved electric drill of drill bit, when can shorten preliminary punchingElectric drill length, second segment punching can be restored to original length again, easy to operate, facilitate angle when punching to position, Ke YiyouThe phenomenon that effect prevents drill bit from drill bit how long being caused to bend in punching.
The technical solution adopted by the present invention to solve the technical problems is: preventing the curved electric drill of drill bit, including drill bit, brillHead holder, head fixing seat, the drill bit are mounted on the drill bit holder, and being provided in the head fixing seat laterally to slideDynamic first bearing, is provided with sliding block in the first bearing, and the sliding block follows the first bearing to move and can be fromThe bottom position of the drill bit slides into the medium position of the drill bit, second bearing is fixedly mounted in the drill bit holder, instituteIt states position of the sliding block between the first bearing and the second bearing and is provided with convex block, when the sliding block is into the drill bitBetween position when moving to reach certain position, the second bearing is in contact with the convex block, and the sliding block stress is resisted against describedOn drill bit.In this way, can make electric drill when first segment punching, the sliding block is located at the medium position of the drill bit,It is then subjected to pressing against for the second bearing to rotate together on the drill bit, shortens the protruded length of the drill bit,It prevents from cutting when punching tiltedly, and can prevent the drill bit is exposed the drill bit how long is caused to bend.
In above-mentioned technical proposal, it is preferred that be additionally provided with slide switch in the head fixing seat, the slide switch withThe first bearing is fixedly connected, and the first bearing is driven to slide laterally in the head fixing seat.In this way, can be withThe state of the sliding block is controlled by controlling the position of the slide switch in the outside of electric drill.
In above-mentioned technical proposal, it is preferred that be additionally provided with spring in the head fixing seat, the spring drives the cunningDynamic switch drives the position of the sliding block far from the drill bit.In this way, electric drill can be made in second segment punching, the cunningDynamic switch automatically reverts to initial position, so that the sliding block be driven to be returned in the head fixing seat.
In above-mentioned technical proposal, it is preferred that the first bearing and the second bearing are needle bearing.In this way,When the sliding block can be made to be adsorbed on the drill bit, the drill bit can be followed to rotate synchronously.
In above-mentioned technical proposal, it is preferred that the sliding block is 2, is respectively placed in the two sides up and down of the drill bit.It sets in this wayIt sets, the drill bit uniform force, fixation in punching can be made more firm.
In above-mentioned technical proposal, it is preferred that the convex block has tilt angle.In this way, the sliding block is facilitated to bounce backWithout stuck by the second bearing.
The beneficial effects of the present invention are: can be by changing the exposed length of the drill bit to the adjusting of the slide positionDegree.It can make electric drill when first segment punching, the sliding block is located at the medium position of the drill bit, is then subjected to described thePressing against for two bearings rotates together on the drill bit, shortens the protruded length of the drill bit, prevents from cutting when punching tiltedly,And can prevent the drill bit is exposed the drill bit how long is caused to bend, structure is simple, easy to operate.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is original state schematic diagram of the invention.
Fig. 2 is the schematic diagram that sliding block of the invention is resisted against on drill bit.
Fig. 3 is the enlarged diagram in Fig. 1 at A.
Fig. 4 is the enlarged diagram in Fig. 2 at B.
In figure, 1. drill bits, 2. drill bit holders, 3. head fixing seats, 4. first bearings, 5. sliding blocks, 51. convex blocks, 6. slidingsSwitch, 7. springs, 8. second bearings.
Specific embodiment
In figures 1-4, the curved electric drill of drill bit, including drill bit 1, drill bit holder 2, head fixing seat 3, the drill bit are prevented1 is mounted on the drill bit holder 2, is provided with the first bearing 4 that can be slid laterally in the head fixing seat 3, and described firstSliding block 5 is provided in bearing 4, the sliding block 5 follows the movement of first bearing 4 and can be from the bottom position of the drill bit 1It sets the medium position for sliding into the drill bit 1, is fixedly mounted second bearing 8 in the drill bit holder 2, the sliding block 5 is describedPosition between first bearing 4 and the second bearing 8 is provided with convex block 51, when the sliding block 5 is to 1 middle position of drill bitWhen moving to reach certain position, the second bearing 8 is in contact with the convex block 51, and 5 stress of sliding block is resisted against the brillOn first 1.Slide switch 6 and spring 7, the slide switch 6 and the first bearing 4 are additionally provided in the head fixing seat 3It is fixedly connected, the first bearing 4 is driven to slide laterally in the head fixing seat 3, described 7 one end of spring is resisted against describedOn slide switch 6, the slide switch 6 position far from the drill bit 1 that drives the sliding block 5 is driven.
The course of work of the invention is as follows: electric drill pushes the slide switch 6 to drive described first when first segment punchesBearing 4 and the sliding block 5 are moved to the middle position of the drill bit 1, the convex block 51 on the sliding block 5 and the second bearing 8It is in contact, the second bearing 8 is resisted against the sliding block 5 on the drill bit 1 and the drill bit 1 synchronous rotation.To first segmentAfter the completion of punching, the slide switch 6 is unclamped, is slided backward the slide switch 6 by the driving force of the spring 7, instituteIt states sliding block 5 and leaves the drill bit 1.