CN203579513U - Screwdriver head - Google Patents

Abstract

The utility model relates to a hardware tool and especially relates to a screwdriver head whose screw rod is provided with a double-helical structure. The screwdriver head includes a head rod, working head parts arranged on two ends of the head rod and formed integrally with the head rod. Two ends of the head rod are provided with a clamping part each. The head rod on the inner side of each clamping part is provided with clamping grooves having retracting diameters. The head rod is also provided with two spiral grooves in the clockwise direction. The two spiral grooves are arranged opposite to each other in a tube plane of the head rod. By adopting the design with the clockwise spiral structure, the screw rod has a characteristic of being capable of having spiral elastic deformation. Great impact and high torque produced in a screwing moment can be buffered through elastic deformation of the head rod when a user is screwing a screw, so that damages on a contact face of the working head parts of the head and the screw can be avoided and service lifetime of the screwdriver head can be prolonged.

Description

Screwdriver bit

Technical field

The utility model relates to a kind of hardware & tools, relates in particular to and on a kind of screw rod, is provided with double-helical screwdriver bit.

Background technology

Electric screw driver or pneumatic screw driver are for tightening and unscrew a kind of laborsaving of screw etc. and high efficiency instrument that rotating speed is fast, when screw is tightened, because rotating speed can produce strong impulsive force in the moment of tightening soon, easily screw and screwdriver bit work head engaging piece position are caused to damage.

Summary of the invention

The purpose of this utility model is to change deficiency of the prior art, and provide a kind of screwdriver bit, criticize bar and adopt helical structure design, when screw is tightened, utilize spiral elasticity distortion to make the intense impact and the high moment of torsion that under high rotating speed, produce retarded, avoid screwdriver bit and the infringement that is applied screw contact-making surface, thereby extend the service life of pneumatic screwdriver.

The technical scheme that the utility model adopts:

A kind of screwdriver bit, the work head that comprises batch bar, is arranged on batch bar two ends and is connected with batch bar, described batch bar two ends are respectively provided with a clamping part, on batch bar of clamping part inner side, be provided with the clamping groove that diameter inside contracts, it is characterized in that: on described batch bar, be also provided with two spiral grooves.

Described spiral grooves arises from a clamping groove inner side on batch bar, finally criticizes another clamping groove inner side on bar.

Two described spiral grooves are positioned at position toward each other in the pipe plane of batch bar.

Described spiral grooves is clockwise and distributes on batch bar.

The end of described work head is flat recess or cross recess or crosshead or interior hex slot or plum blossom groove.

The beneficial effects of the utility model: the utility model screwdriver bit is criticized bar and adopted clockwise helical structure design, make screw rod there is spiral elasticity distortion, when screw is tightened, the intense impact that the moment of tightening produces and high moment of torsion are cushioned by the strain of batch bar, avoided the infringement of screwdriver bit work head and screw contact-making surface, the life-span of the screwdriver bit of prolongation.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

The specific embodiment

As shown in Figure 1, a kind of screwdriver bit, comprise batch bar 1, the work head (2 that is arranged on batch bar two ends and is connected with batch bar, 3), criticize bar 1 two ends and be respectively provided with a clamping part (4, 5), clamping part (4, 5) on batch bar 1 of inner side, be provided with the clamping groove (6 that diameter inside contracts, 7), at clamping groove (6, 7) on batch bar 1 between, be provided with two spiral grooves (8, 9), spiral grooves (8, 9) on batch bar, be clockwise and distribute, and spiral grooves (8, 9) in the pipe plane of batch bar 1, be positioned at toward each other position and length identical, work head (2, 3) end is flat recess or cross recess or crosshead or interior hex slot or plum blossom groove.

Claims (5)

1. a screwdriver bit, the work head that comprises batch bar, is arranged on batch bar two ends and is connected with batch bar, described batch bar two ends are respectively provided with a clamping part, on batch bar of clamping part inner side, be provided with the clamping groove that diameter inside contracts, it is characterized in that: on described batch bar, be also provided with two spiral grooves.

2. screwdriver bit according to claim 1, is characterized in that: described spiral grooves arises from a clamping groove inner side on batch bar, finally criticizes another clamping groove inner side on bar.

3. screwdriver bit according to claim 1 and 2, is characterized in that: two described spiral grooves are positioned at position toward each other in the pipe plane of batch bar, and length is identical.

4. screwdriver bit according to claim 1, is characterized in that: described spiral grooves is clockwise and distributes on batch bar.

5. screwdriver bit according to claim 1, is characterized in that: the end of described work head is flat recess or cross recess or crosshead or interior hex slot or plum blossom groove.