CN2399548Y - Improved screw - Google Patents

Abstract

The utility model relates to an improved screw. The connecting corner positions of two adjacent surfaces of a concave hole slot on the top surface of a screw head respectively outwards extend circular arc-shaped cushioning slots which are of an arc shape with the same diameter. The concave hole slot is in a triangle equal section shape, a square equal section shape, a hexagon equal section shape and a cross tapered reducing shape. The utility model has the obvious advantages of effectively reducing mould damage, having large selection space of materials, increasing the contact area of a tool and the hole slot and enlarging the effect of force application. The utility model is improved by aiming at structural characteristics so as to make the existing quality control tool continuously used, and the cost does not increase.

Description

The improvement of screw

The utility model relates to a kind of improvement of screw, belongs to machinery part field in addition.

By screw by people be used for screwing togather member capable for a long time, reuse owing to it can unclamp after screwing togather once more, and have in conjunction with firmly, bear load and the effect of be convenient to construct assembling and dismounting, extensively be people's use so make it.Especially with scientific and technological progress in recent years, make the screw speed of production improve, make its price be tending towards cheap naturally under a large amount of the production, it is universal that this also helps to use.

The structure of screw can roughly be divided into bar portion and head, bar portion periphery have screw thread so that increase when screwing togather with member between combine fastness, head then is that section is bigger, is intended to for the chimeric application of force use of instrument.Head is set for instrument partly also some variations, except that known word screw of people or plus screw, also have a kind of central part to have the depression hole slot, and this depression hole slot can be done triangularity, square, hexagon, cross taper or the like, or equiangular polygon section, when it is constructed,, set in this hole slot and come the application of force with rotation mode then with the corresponding bottle opener of a section configuration size.

This screw can reach basic requirements admittedly, but its disappearance is the respectively corner of this adjacent surface intersection, in process of production during forging molding, often phenomenon such as concentrate, make this hole slot cause occurring as shown in Figure 1 crack A, and then weakened the stress that hole slot can bear because of material flow harden and stress, form quality problems, simultaneously relatively cause punch die acute angle place to burst apart and loss, this was difficult for its quality is done effectively control in today of a large amount of productions; Especially, because this quality problems of appearance in the course of working so can only select for use hardness low on the material, for the forging molding of height flow harden material such as stainless steel, high carbon steel or the metal too of navigating difficulty very then.

Simultaneously, because the specification of instrument is not unified, therefore, even each corner also can be because of stressed relation causes occurring aforesaid crack A during construction after moulding, so that construction quality can not guarantee labor intensive and material resources.

The purpose of this utility model is the improvement that proposes screw, its head hole slot can be reduced the crack occurs, and unlikely the bursting apart in punch die acute angle place, and improve its working life, reduce manufacture cost, select material to have, and help strengthening application of force effect than large space.

The technical measures of implementing the utility model above-mentioned purpose and taking are as described below: the two approximal surfaces handing-over corner place of depression hole slot on the screw head end face, the dashpot of the circular arc that respectively stretches out; Dashpot is isometrical arc; Described depression hole slot is the triangle equal section; Described depression hole slot is square equal section; The depression hole slot is the hexagon equal section; The depression hole slot is a cross taper gradually-reducing shape.

Now the embodiment shown in conjunction with the accompanying drawings is further described the improvement of the utility model screw.Wherein

The schematic representation that Fig. 1 has the crack quality problems for the corner that has screw.

Fig. 2 is added to schematic representation on the tri-angle-holed grooved screw for the utility model dashpot.

Fig. 3 is the schematic representation on the utility model dashpot the is added to tetragonal hole slot screw.

Fig. 4 is added to schematic representation on the hex hole grooved screw for the utility model dashpot.

Fig. 5 is added to schematic representation on the plus screw for the utility model dashpot.

Fig. 6 is the sectional drawing of Fig. 5.

Fig. 7 is the schematic representation that is added on the another kind of plus screw.

Piece number explanation among the figure:

Hole slot 1 corner 11 dashpots 12

As shown in the figure, the utility model screw can be the triangle hole slot as Fig. 2 basically, the tetragonal hole slot of Fig. 3, as the hexagon hole slot of Fig. 4, and even other polygon hole slot, all have the depression of a hole slot 1 on it, before address, this depression is to form via die stamping in the forging mode.

Improvement place of the present utility model is each corner 11 place at hole slot 1, promptly extend this depression outward, and merge with this corner 11 and to form a circular dashpot 12, the shape of these dashpots 12 is different because of the shape of hole slot 1, but it is with isometrical arc basically, and the big acute angle of the unlikely one-tenth of angle of adjacent surface is advisable.

Shown in Fig. 5 to 6 is plus screw, also open known taper depression cross hole slot 1 on the end face of its bar head, be known that corner 11 places of the utility model and be different from the hole slot 1 two adjacent surfaces intersection that respectively is the cross extension, a minibuffer groove 12 respectively stretches out, and these dashpots 12 constitute good with isometrical arc, and itself and hole slot 1 are for one runs through, and its degree of depth as shown in Figure 6, so that be advisable in the turning point of bottom.

As shown in Figure 7 be added to " the rice font plus screw " that people are used to claim for the utility model dashpot, this screw head is corner 11 places in the hole slot 1 two adjacent surfaces intersection that is cross extension, the minibuffer groove 12 that respectively stretches out, and be good with isometrical circular arc.

Please consult accompanying drawing again, the utility model is adding man-hour, before to have addressed be adopt to forge punching press, so when mould also adopts four relative corner places to have the arc overhang that can form dashpot 12, then when punching press applied, the suffered stress of each corner can therefore no longer concentrate and intersection connects sharp corner in the straight line of corner, but be split on the camber line of this dashpot 12, therefore just do not have aforementioned crack A generation, thereby can increase substantially the quality and the up-to-standard rate of product.

So, can obtain very obvious effect via enforcement of the present utility model, in respect of following aspects:

(1) via the circular arc dashpot that extends outward, can reduce damages of bursting apart that adds the mould in man-hour effectively, and improve punch die working life, the reduction manufacture cost.

The circular arc dashpot design of (2) extending has outward reduced the material stress and has concentrated the slight crack that causes, and also makes material select to have bigger space, and height flow harden material such as stainless steel, high carbon steel, and even the material that navigates too all can be processed use.

(3) owing to the interference of no acute angle, just can increase the area of contact of instrument and hole slot, strengthen application of force effect, improve the goods practicability, and reduce damage to each other.

(4) the utility model dashpot is improved at structural characteristics, so to former goods specification and no change, and employed quality control apparatus such as feeler gauge, depth gauge, and even personnel's operation all can be continued to use unlikely increase cost with training.

The utility model disclosed is one of preferred embodiment, and partial alteration or modification and come from the utility model technological thought and this technician is easy to know by inference in order to know such as all do not break away from patent right category of the present utility model.

Claims (6)

1. the improvement of a screw is characterized in that, the two approximal surfaces handing-over corner place of depression hole slot on the screw head end face, the dashpot of the circular arc that respectively stretches out.

2. the improvement of screw as claimed in claim 1 is characterized in that, dashpot is isometrical arc.

3. the improvement of screw as claimed in claim 1 is characterized in that, described depression hole slot is the triangle equal section.

4. the improvement of screw as claimed in claim 1 or 2 is characterized in that, described depression hole slot is square equal section.

5. the improvement of screw as claimed in claim 1 or 2 is characterized in that, described depression hole slot is the hexagon equal section.

6. the improvement of screw as claimed in claim 1 or 2 is characterized in that, described depression hole slot is a cross taper gradually-reducing shape.

Images