CN2588112Y - Check screw - Google Patents

Abstract

The utility model relates to a check screw. A locking pull-rod penetrates through the inner part of a centre hole of the screw, and the head part of the locking pull-rod is provided with a frustum-shaped locking head. One side of the head part of the screw at the rear part of the frustum-shaped locking head is provided with a transverse gap, and the screw at the intermediate position of the gap is provided with an axial breaking slot. A convex sinew is arranged at the position of the frustum-shaped locking head corresponding to the axial breaking slot, and the convex sinew is clamped in the axial breaking slot in a sliding way. The width of the gap with a large width of a transverse slot of the utility model has better be is not more than 0.2 mm, which causes the deformation range between the wall surfaces of the transverse slot at the time of squeezing and stretching to be delimited within a small range and not beyond the limitation of the elastic deformation, when the screw is in use. In addition, the convex sinew of the locking pull-rod is combined with the breaking slot, which prevents the locking pull-rod from rotating at the time of locking and avoids the torsional deformation at the braking slot because of rotation, so as to avoid chipping occurring at the head part of the screw, to effectively improve the service life of the check screw, and to reduce the production cost.

Description

Backing-up screw

Technical field

The utility model relates to field of mechanical technique, relates in particular in a kind of center hole of screw and is coated with the locking pull bar, and head one side of screw has translot, has the backing-up screw of axial fault trough on the screw wall in translot neutral position.

Background technique

Screw is used for fastening occasion, at first will solve loosening problem.The own production and selling of claimant has a kind of backing-up screw, is coated with the locking pull bar in the center hole of screw, and screw head one side has translot, and the translot gap that Xian goes out has axial fault trough on the screw wall in translot neutral position more than 2mm.After in screw screws in screw, screwing, screw the nut of locking pull bar outer end again, make the head of the taper tapered end spreading screw of locking pull bar inner termination, make to produce the applying friction effect between screw head and the screw, thereby reach the locking effect of retaining.But find in actual use, after screw draws off, often have head to split broken phenomenon.Through testing repeatedly, observe and dividing folding, conclusion is: the excessive rotation with the locking pull bar of the width of screw head translot is the root of problem.

The model utility content

The purpose of this utility model is to provide a kind of backing-up screw, and is broken to avoid screw head to split.

For achieving the above object, the technical solution of the utility model is to have adopted a kind of backing-up screw, be coated with the locking pull bar in the center hole of screw, the head of pull bar is provided with the taper type tapered end, head one side at the screw at taper type tapered end rear portion has horizontal slit, have axial fault trough on the screw in neutral position, slit, the corresponding position of taper type tapered end and this fault trough is provided with a convex tendon, and the convex tendon slip clamp is put in this fault trough.

Described gap width is not more than 0.2mm.

Because the width of screw head translot is reduced significantly, makes screw in use, the deformation band between the translot wall when being squeezed and stretch is limited within the very little scope, is unlikely to exceed the limit of its resiliently deformable; In addition, the convex tendon of locking pull bar combines with fault trough, stoped the locking pull bar when locking, to rotate, avoided causing the torsional deflection at fault trough place because of rotation, thereby avoided screw head chipping, improved the working life of backing-up screw effectively, reduced cost of production, favorable economic benefit and social benefit have been arranged.

Description of drawings

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

Fig. 2 is the plan view of Fig. 1.

Embodiment

As shown in Figure 1 and Figure 2, among the figure, the center of screw 3 is provided with through hole 9, is coated with locking pull bar 1 in the through hole 9, and the head of locking pull bar 1 is provided with taper type tapered end 6, and the afterbody of locking pull bar 1 is installed with locking nut 2.The head endoporus of screw 3 is funnel shape enlarging 8, and enlarging 8 rear portions are cut with a translot 4, and the centre of translot 4 has axial fault trough 5, and translot 4 intersects vertically with fault trough 5.Key point of the present utility model is the width of translot 4 is reduced to below the 1mm, and in the present embodiment, the width of translot 4 is 0.2mm, and the width of fault trough 5 is 2.0mm.In addition, screw for fear of locking pull bar 1 usefulness and to rotate when nut 2 is pulled out thereupon, be provided with a convex tendon 7 at the corresponding position of tapered end 6, convex tendon 7 slip clamp are put in the fault trough 5.

Claims (2)

1, a kind of backing-up screw, be coated with the locking pull bar in the center hole of screw, the head of pull bar is provided with the taper type tapered end, it is characterized in that: head one side at the screw at taper type tapered end rear portion has horizontal slit, have axial fault trough on the screw in neutral position, slit, the corresponding position of taper type tapered end and this fault trough is provided with a convex tendon, and the convex tendon slip clamp is put in this fault trough.

2, backing-up screw according to claim 1 is characterized in that: described gap width is not more than 0.2mm.

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