CN2268799Y - Flat head screw - Google Patents

Abstract

The utility model relates to a flat head screw, wherein, the screw head has two stages of different tapers, and the connecting position between the flat head screw and a screw thread part is formed into a minor expanding taper. The top edge of the minor expanding taper is formed into a larger expanding taper and is extended to the circumference of a cutting end to form a cutting section, a loose-proof ring is formed between the cutting section and the cutting end, a plurality of triangular cuts with equal separating angles are arranged in circle on the taper surface of the cutting section, and the inner face of each cut is an inclined plane. One side of the inclined plane is connected with the one inclined edge of each cut, the other inclined edge of each cut is raised above the other side of the inclined plane to form a cutting edge, and a containing space for cutting chips is preset at the inner face of the cut.

Description

Thread screw

The utility model relates to a kind of thread screw, refers to especially a kind ofly can on object, directly cut counter sink, and with the thread screw of making effect such as simple and easy, that reject rate is low.

Screw is a kind of fastener that industrial circle is generally used, though and the ailhead of screw has multiple pattern, so its most common person is still based on thread screw.Existing thread screw all is to establish the screw section in the below of a level and smooth cone shape ailhead, and it uses then by the screw section and screw between object it combination, and ailhead is sunk to object surface, forms the use kenel of a standard.

The counter sink that existing ailhead for thread screw sinks to object surface all needs promptly to be finished by instrument before screw screws in object, and after making it to screw in object fully in the screw section of screw, ailhead can sink to object surface smoothly; If the course of working in advance without this counter sink then after the screw section is in conjunction with object, need apply axial pressure and torsion again, ailhead is sunk to fully.Right this application of force screws in the process of ailhead, not only rather effort and inconvenience, and very easily cause the stressed great disappearance of splitting in object edge; Because ailhead sinks to the chip that is produced and can't effectively discharge, more increased the resistance that screws in ailhead again.In addition, it often is difficult to correct grasp because of axial pressure and the torsion that is applied, and causes causing screw crooked or pierced dark unfavorable condition and take place.

So, industrial circle is provided with from a kind of ailhead of external introduction surface and cuts the thread screw of cutting cutting edge in recent years, can directly cut in screwing in object the time and cut out counter sink, it is as number (Announcement Number: 21249 3) novel patent case one by one of preceding the 812 First Five-Year Plan six of having checked and approved patent.This thread screw mainly is divided into three different sections on the frustum of ailhead, be respectively conical surface lining cutting section, support section and cut and cut section, and this conical surface lining cutting section is distributed in the taper scopes that the angle trisection promptly respectively is 120 degree, and directly extends to the exterior angle of the frustum of countersunk head from the screw section; This support section has a conical surface ring, and evenly forms with conical surface lining cutting section, and smooth-going around near the extension of the maximum radius the upper surface, and passes the formed ring support zone in inclined-plane of its 90 degree groove angle, promptly defines the conical surface; This cuts to cut respectively to have in the section to cut cuts cutting edge, these cut cuts cutting edge and ends at the conical surface place that part defined that support section is finished the work smoothly, and cut and cut section and respectively have expansion angle, so can be between conical surface lining cutting section, conical surface ring and screw section, in addition in wherein still leaving the swarf holding space.So when screwing in object, can directly cut a frustum shape counter sink, sink in it for ailhead, form the use kenel of standard.

Though this thread screw has the effectiveness that can cut a frustum shape counter sink on object; But, and cut and cut section and respectively have expansion angle, and between conical surface lining cutting section, conical surface ring and screw section because its conical surface lining cutting section directly extends to the exterior angle of the frustum of countersunk head from the screw section.Therefore, it makes very difficult, and especially in the scope of the cone-shaped ailhead small size like this of screw, real storage has high degree of difficulty, so its defective products ratio is very high, also embarrasses industrial circle to accept on the price, so the use value of not having.

In view of this, the purpose of this utility model is to provide a kind of thread screw, and it can directly cut counter sink when screwing in, and can fully reach and make the benefit simple and easy, that reject rate is low, with low cost, possesses the value on the industry.

The thread screw that provides according to the utility model, its ailhead has two sections different taperings, and be less expansion tapering in ailhead and connecting part, screw section, the ora terminalis place of this less expansion tapering then form a bigger expansion tapering and extend to the periphery of butt and define one the cutting section, this cutting section terminates in the inboard of butt, therebetween forms a locking ring; Wherein: on the conical surface of this cutting section around being provided with several triangular shape otch, the angle is provided with between these triangular shape otch one-tenth etc., leave the smooth locking conical surface therebetween, and each triangular shape otch forms a side along the ring edge of locking ring, and forms two oblique edges by the ora terminalis of this side towards the crest line place of less expansion tapering; The inner face of each triangular shape otch is a plane of inclination again, and a side of this plane of inclination is connected with an oblique edge, and another oblique edge system slightly forms a cutting blade above the opposite side of this plane of inclination, and all reserves a smear metal holding space in the inner face of each otch;

Thus, when it can screw in the object with ailhead, make the cutting blade of each the triangular shape otch on the cutting section directly cut a conical counter sink, sink in it for ailhead in the place, aperture of object, reach and directly cut counter sink, have concurrently and make effects such as simple and easy, that reject rate is low.

The shape of each otch on this cutting section can be equilateral triangle, scalene or isosceles triangle.

Be the structure of reaching above-mentioned purpose with the utility model more now, the mode with the conjunction with figs. explanation is described in detail as follows.

Fig. 1 is a stereo appearance figure of the present utility model.

Fig. 2 is the local vertical view cutaway drawing of ailhead part of the present utility model.

Fig. 3 is the front view of ailhead part of the present utility model.

Fig. 4 is the upwarding cutaway view of ailhead part of the present utility model.

Fig. 5 partly screws in the generalized section of object in order to the cutting counter sink for the cutting section of ailhead of the present utility model.

The generalized section that combines between each locking position and object when Fig. 6 screws in the object for ailhead of the present utility model fully.

At first please consult shown in Fig. 1 to 4 simultaneously, the utility model thread screw 1 is made of an ailhead 11 and a screw section 12, wherein this ailhead 11 is a frustum of a cone body, and be provided with the fluting 111 an of hexagonal star-shape (or other shapes) in the surface of its butt, can insert for screwdriver, for the usefulness of turn.This ailhead 11 has the section of two sections different taperings, and itself and 12 connecting parts, screw section are less expansion tapering, can screw in the objects for guiding ailhead 11, and can provide one to prevent the auxiliaring effect that gets loose after screwing in; The ora terminalis place of this less expansion tapering forms a bigger expansion tapering and extends to the periphery of butt, cut section 13 to define one, and this cutting section 13 terminates in the inboard of butt, can be for forming a locking ring 14 in butt and 13 of cutting sections; Again on the conical surface of cutting section 13 around being provided with several triangular shape otch 131, angle setting between 131 one-tenths at these triangular shape otch wait can therebetween leave some smooth locking conical surfaces 132; And each triangular shape otch 131 all forms a side along the ring edge of locking ring 14, and intersect at the crest line place of less expansion tapering and form two oblique edges by two ora terminalis of this side are oblique inwardly, the inner face of each triangular shape otch 131 is all a plane of inclination, one side of this plane of inclination is connected with an oblique edge, another oblique edge then omits above the opposite side of this plane of inclination and forms a cutting blade 133, and reserves a smear metal holding space 134 in the inner face of otch 131; The circle of 133 of cutting blades on each triangular shape otch 131 is identical with the thread rotary orientation of screw section 12 around direction again, can cut a conical counter sink in the place, aperture of object when screwing in the objects with screw section 12, sinks in it for ailhead 11.

The utility model is when using such as Fig. 5, shown in 6, in screw section 12 screws in object 2 fully with after screwing togather two articles, the user continues to impose warping force and axial pressure, make this less expansion tapering that is positioned at ailhead 11 and 12 connecting parts, screw section and cutting section 13 enter object 2, then can utilize the cutting blade 133 of each triangular shape otch 131 on the cutting section 13, directly cut a conical counter sink identical shaped with ailhead 11 in place, the aperture of object 2, make ailhead 11 can sink to (see figure 5) in the object 2, and the residual swarf in cutting back can be inserted in the smear metal holding space 134; After treating that locking ring 14 enters in the object 2 fully, can make the firm screw-in (as shown in Figure 6) of thread screw 1, and can be by locking ring 14, the locking conical surface 132 and ailhead 11 expansion tapering with 12 connecting parts, screw section, the fixing effect very closely of acquisition is with getting loose of effectively preventing to produce between thread screw 1 and object.

The utility model really can be by the cutting blade 133 that forms on each otch 131 that cuts section 13, make it can be in ailhead 11 screws in objects 2 time, directly cut a conical counter sink in the place, aperture of object 2, sink in it for ailhead 11, and can save installation time of object 2, and stressed the splitting in edge that can avoid causing object 2.In addition, the utility model only needs on the cutting section 13 of ailhead 11 around several triangular shape otch 131 are set, can effectively reach its creation purpose, so it is very simple and easy on making, and reject rate is extremely low, therefore rather economical and practical on the price, working life is also very long, can fully possess the value on the industry.

In sum, the utility model has on its effect than existing thread screw promotes part, possesses the value on the industry, and it is that the structure design of reaching the creation purpose had not also seen ware again, so have novelty and progressive.

Claims (2)

1, a kind of thread screw, its ailhead has two sections different taperings, and be less expansion tapering in ailhead and connecting part, screw section, the ora terminalis place of this less expansion tapering then form a bigger expansion tapering and extend to the periphery of butt and define one the cutting section, this cutting section terminates in the inboard of butt, therebetween forms a locking ring; It is characterized in that: on the conical surface of this cutting section around being provided with several triangular shape otch, the angle is provided with between these triangular shape otch one-tenth etc., leave the smooth locking conical surface therebetween, and each triangular shape otch forms a side along the ring edge of locking ring, and forms two oblique edges by the ora terminalis of this side towards the crest line place of less expansion tapering; The inner face of each triangular shape otch is a plane of inclination again, and a side of this plane of inclination is connected with an oblique edge, and another oblique edge system slightly forms a cutting blade above the opposite side of this plane of inclination, and all reserves a smear metal holding space in the inner face of each otch.

2, thread screw as claimed in claim 1 is characterized in that: the shape of each otch can be equilateral triangle, scalene or isosceles triangle on this cutting section.

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