CN101074697A - Concaved bolt and nut and corresponded spanners - Google Patents

Abstract

A concave edges shape bolts, nuts and the corresponding bolt nut wrenches, including bolt-head bolt, bolt head or nut referred to the edge of the concave shape. Wrenches include wrench handle and the curved surface of the corresponding wrench in the face of the medial .When used, it will be wrench arc processes bolt nut stuck in the groove, fastening wrench rotation can be.

Description

A kind of concave edge shape bolt and nut and corresponding spanner thereof

Technical field:

The present invention relates to a kind of fastening piece and special handling tool, a kind of specifically concave edge shape bolt and nut and corresponding spanner thereof.

Background technique:

Usually the fastener bolt nut profile of usefulness be hexagon as shown in Figure 1, versatility is very strong, but through frequent dismounting, the corner angle of hexagonal row bolt and nut are easy to be worn into fillet by spanner, bring great difficulty to dismounting, especially after the shape of nut corrosion limit, can't dismantle at all, though there is the people to design some relevant devices now, power transmission tower theftproof bolt nut device and spanner as China Patent No. CN2204876Y notice of authorization, the self-regulated nut spanner of China Patent No. CN2574842Y notice of authorization and China Patent No. CN1415864A notice of authorization loosen moving bolt, these devices are difficult to fundamentally address the above problem.

Summary of the invention:

The object of the present invention is to provide a kind of concave edge shape bolt and nut and corresponding spanner thereof.

Technical problem solved by the invention can realize by the following technical solutions:

A kind of concave edge shape bolt and nut and corresponding spanner thereof, bolt comprises the bolt shank bolt head, and each limit of described bolt head or nut is a concave edge shape, and the spanner working surface that spanner comprises spanner and handle body correspondence is the arc shaped surface of projection to the inside.

Described bolt head or nut are polygonal, have at least on the limit of two correspondences fluted.

The spanner of described spanner can be the fixed size spanner, also can be movable jaw.

The invention has the beneficial effects as follows, fastening or when dismantling bolt of the present invention or nut, the corner angle that can not produce bolt head or nut are worn into fillet, cause the dismounting situation of difficult, corresponding spanner is easy to dismantle bolt or the nut that has groove, and is simple and practical.

Description of drawings:

Fig. 1 is the schematic representation of existing nut.

Fig. 2 is a kind of nut schematic representation with concave edge of the present invention.

Fig. 3 is a kind of nut schematic representation with groove of the present invention.

Fig. 4 is the schematic representation of spanner of the present invention.

Fig. 5 is the schematic representation of the bolt of a kind of concave edge shape of the present invention.

Embodiment:

The present invention is further described below in conjunction with drawings and Examples: a kind of concave edge shape bolt and nut and corresponding spanner thereof, bolt comprises bolt shank 21 bolt heads 22, each limit of described bolt head or nut is fluted 22, the spanner working surface that spanner comprises spanner 31 and handle body 32 correspondences for the arc shaped surface 30 of projection to the inside (referring to Fig. 2-Fig. 5).

Described bolt head or nut are polygonal, and be all fluted 22 on each limit, also can be only fluted 22 on two opposite sides, do not have groove on other the limit, and polygonal can be that quadrilateral, Hexagon, Octagon etc. are (referring to Fig. 2-Fig. 4).

The spanner of described spanner can be the fixed size spanner, also can be movable jaw (referring to Fig. 5).

When wrench during for adjustable spanner with figure extensively, size adjustable, adjustable spanner comprises handle body 32, fixedly spanner 33, movable jaw 31, adjusting screw rod 34, at the fixing inboard working surface of spanner 33 and movable jaw 31 is arc 30, wherein fixedly spanner 33 and handle body 32 are usually made an integral body, and a side of movable jaw 31 is shaped on partial screw threads, are contained in the chute of fixing spanner 33 (referring to Fig. 5).

When spanner is the fixed size spanner, handle body and fixedly spanner be structure as a whole, the inboard working surface of spanner is an arc.

During use, the arc-shaped protrusions of spanner is blocked in the groove of bolt and nut, the spanner rotation gets final product.

Be not difficult to find out; the present invention turns round reliable than the prior art folder; can slippage; it is handy to use; effectively improve maintenance efficiency of assembling, in addition to the implementation; the present invention can also have other mode of execution, and all employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop within protection scope of the present invention.

Claims (3)

1, a kind of concave edge shape bolt and nut and corresponding spanner thereof is characterized in that:

Each limit of the head of a, described bolt or nut is a concave edge shape;

The spanner working surface that b, described spanner comprise spanner and handle body correspondence is the arc shaped surface of projection to the inside.

2, a kind of concave edge shape bolt and nut according to claim 1 and corresponding spanner thereof is characterized in that described bolt head or nut are polygonal, have at least on the limit of two correspondences fluted.

3, a kind of concave edge shape bolt and nut according to claim 1 and corresponding spanner thereof is characterized in that the spanner of described spanner can be the fixed size spanner, also can be movable jaw.

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