CN2071113U

CN2071113U - Slip-proof screwdriver

Info

Publication number: CN2071113U
Application number: CN 89218233
Authority: CN
Inventors: 李全胜
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-10-16
Filing date: 1989-10-16
Publication date: 1991-02-13

Abstract

The utility model relates to a slip-proof screwdriver for screwing and unscrewing a screw with spherical head. A slip-proof projection is added respectively on the left and right edges of a tool bit and certain distance is kept from the lower surface of the projection to a knife edge so that while screwing or unscrewing the screw, the projection clips respectively the left and right edges of the upper groove of the screw head to prevent from slipping down, increase the work efficiency and ensure that the arms of the operator can not be scuffed.

Description

Slip-proof screwdriver

The utility model relates to a kind of anti-skidding screwdriver that is used for degree of tightness sphere head screw.

The phenomenon of cutter head slippage from the head of screw groove usually takes place in the normal screws cutter when tightening or unclamp cheese head screw, influence operating efficiency, even scratches arm.

Task of the present utility model is exactly to provide the new-type screwdriver that a kind of driver bit can slippage from the groove of head of screw for people's degree of tightness sphere head screw.

This task realizes with following technical scheme:

Identical with the normal screws cutter, mainly form by handle 1, knife bar 2 and cutter head 3, improved part is: respectively increase an anti-skidding boss 4 at the left and right edges place of cutter head 3, the lower plane of this boss has a segment distance h apart from the edge of a knife 5 of cutter head 3, h be on the head of screw groove depth 1/3～1/2.Like this,, can block the right and left of groove again, cutter head 3 will not be skidded off from the both sides of groove by the inboard of two anti-skidding boss 4 even the edge of a knife 5 stretches into the interior necessary degree of depth of groove on the head of screw.

Below by drawings and Examples the utility model is described further.

Fig. 1 is anti-skidding screwdriver general illustration.

Fig. 2 is the user mode schematic diagram.

Fig. 3 is the cutter head A-A profile of anti-skidding screwdriver.(amplification)

Fig. 4 is the cutter head A-A profile of another embodiment.(amplification)

Referring to Fig. 1, Fig. 2, Fig. 3.1 is that handle, 2 is that knife bar, 3 is cutter head, and 4 is anti-skidding boss.Two anti-skidding boss 4 all are positioned on the same side A of cutter head 3 in the present embodiment, can play anti-skidding effect.5 is the edge of a knife.

Referring to Fig. 4.In second embodiment, different places be two anti-skidding boss 4 lay respectively at positive and negative two sides (A) of cutter head 3 and (B) on, such skidproof effect is better.

The utility model has the advantages that cutter head never skids off, and can't scratch the accident of arm thereby increase work efficiency when degree of tightness sphere head screw from the groove of head of screw. Said sphere head screw comprises oval fillister head screw, button-headed screw and various holding screw.

Claims

1, a kind of anti-skidding screwdriver that is used for degree of tightness sphere head screw, form by handle 1, knife bar 2 and cutter head 3, it is characterized in that an anti-skidding boss 4 is respectively arranged at the left and right edges place of cutter head 3, and the lower plane of this boss apart from the distance h of the edge of a knife 5 of cutter head 3 be on the head of screw groove depth H 1/3～1/2.

2, anti-skidding screwdriver according to claim 1 is characterized in that said two anti-skidding boss 4 all are positioned on the same side A of cutter head 3.

3, anti-skidding screwdriver according to claim 1 is characterized in that said two anti-skidding boss 4 lay respectively on positive and negative two the side A and B of cutter head 3.