CN102252011B - Locking low-resistance screw - Google Patents

Abstract

The invention discloses a locking low-resistance screw, which comprises a screw head, a rod body, a plurality of first screw teeth, a locking part and a plurality of second screw teeth; the second threads are provided with a plurality of opposite open grooves, and the included angle of the first crest of the first threads is smaller than the included angle of the second crest of the second threads; when the screw is locked, the open slot on the second screw tooth can effectively assist the first screw tooth to cut an object and provide chip holding, and the first screw tooth with a smaller first crest angle can strengthen the drill locking stress of the second screw tooth with a larger second crest angle, so that the cutting capability of the locked low-resistance screw is further improved, and the effect of quick locking is achieved.

Description

A kind of locking low resistance screw

technical field

The invention relates to the field of screws, in particular to a locking screw with fast cutting speed and high strength and low resistance.

Background technique

Referring to FIGS. 1 to 3 , the screw 1 disclosed in U.S. Patent No. 2005/0186048 includes a screw head 11, a rod body 12 extending from the screw head 11, a plurality of screw threads 13 with spiral rings arranged on the rod body 12, and A locking portion 14 provided on the rod body 12 and opposite to the screw head 11; wherein, the screw teeth 13 are provided with a plurality of connected cutouts 131, especially, the upper and lower crests of the screw teeth 13 132, 133 intersect to form a tooth crest angle α (about 30 degrees to 35 degrees), and the apex 135 formed by the outer tooth crest 134 on the incision 131 intersects to form a vertex angle α' (about 30 degrees ~58 degrees), and the cutout 131 forms a cutout angle A; therefore, when locking, the existing screw 1 can use the turning function of the cutouts 131 to enhance the cutting effect of the screw teeth 13, and then To achieve the effect of fast locking and positioning.

However, after actual use, it has been found that during the locking of the threads 13 into the object 2, although the setting of the slits 131 can provide a better cutting effect, the angle A of the slit angle A of the slits 131 and the Designs such as the angle α between the tooth crests of the thread 13 are actually likely to affect the locking effect of the screw 1. The specific analysis is as follows:

1. First, consider the angle of the angle A of the cuts:

The cutting ability of these thread teeth 13 is affected by the setting angle of these notch included angles A, that is, if the angle setting of these notch included angles A is too small, then the fast speed will be performed during the cutting process of these thread teeth 13. When the action of locking and entering the object 2, the fibers of the object 2 cannot enter the incisions 131 one by one due to the characteristic of elastic recovery force, so that the incisions 131 cannot effectively provide the function of assisting the turning of the object 2 one by one, Therefore, the cutting ability of these slits 131 is limited, or even has no effect, and it is impossible to guide the screw 1 to penetrate into the object 2; on the contrary, if the slit angle A is too large, the size of the screw teeth 13 may be relatively large. On the contrary, the turning capability of the notches 131 with too large notch angle A is not as good as that of the smaller notch angle A, and such relatively small screw teeth 12 are subjected to bearing due to their weak structure. Insufficient torque can easily lead to broken teeth, which is also worth improving.

2. Considering the design of the angle α between the crests of these threads 13:

The locking effect of the screw 1 is affected by the design angle of the angle α between the crests of the threads 13 and is different. It has better cutting ability, but when the thread 13 encounters a hard object, it is very easy for the thread 13 to be unable to withstand a large screw-in torque, which makes it easy for the thread 13 to be locked during the locking process. Conversely, when the angle α between the crests of the threads 13 is relatively large, although the threads 13 can withstand torque better, the cutting effect is not as good as that of threads with a smaller angle α between the crests , so the use has its limitations, and it needs to be improved.

Contents of the invention

The purpose of the present invention is to provide a low-resistance locking screw to solve the problem of poor locking strength of the screw for improving cutting ability in the prior art.

In order to achieve the above object, the solution of the present invention is:

A locking low-resistance screw, comprising a screw head, a rod body extending from the screw head, a first thread with multiple helical rings arranged on the rod body, and a screw thread opposite to the direction of the screw head and arranged on the rod body Locking portion; each first thread has a first upper crest surface and a first lower crest surface connected to the first upper crest surface; the first upper crest surface and the first crest surface The joints of the lower crest surfaces intersect to form a first crest angle; wherein: the upper helical ring of the rod body is provided with a plurality of second thread teeth that are separately arranged on the first upper crest surface and the first lower crest surface ; Each second thread has a second upper crest surface and a second lower crest surface connected to the second upper crest surface; the second upper crest surface and the second lower crest surface There is a second crest angle at the junction of the two crests; the second upper crest surface and the second lower crest surface are provided with a plurality of opposite grooves; the first crest angle is smaller than the second crest angle.

Further, the diameter of the first thread is smaller than the diameter of the second thread.

Further, the diameter of the first thread is equal to the diameter of the second thread.

After adopting the above-mentioned structure, the present invention relates to a low-resistance locking screw. When locking, the slot can not only effectively cut objects and accommodate chips, but also cooperate with the first screw teeth and set them on the second screw teeth. The way between the two screw teeth, and the included angle of the first crest is smaller than the angle of the second crest can not only enhance the strength of the second crests, but also improve the cutting ability of the locked low-resistance screw, so The invention not only has the effect of fast locking, but also has the characteristics of high strength.

Description of drawings

Fig. 1 is the schematic diagram of existing a kind of screw;

Fig. 2 is a single thread sectional view of an existing screw;

Fig. 3 is the thread schematic diagram of existing screw;

Fig. 4 is the three-dimensional schematic view of the first preferred embodiment of the present invention;

Fig. 5 is a partial enlarged view of Fig. 4;

Fig. 6 is a single thread sectional view of the first preferred embodiment of the present invention;

Fig. 7 is a schematic diagram of the thread of the first preferred embodiment of the present invention;

Fig. 8 is a schematic diagram of the thread of the second preferred embodiment of the present invention;

Fig. 9 is a schematic diagram of the thread of the second preferred embodiment of the present invention;

Fig. 10 is a schematic perspective view of a third preferred embodiment of the present invention;

FIG. 11 is a partially enlarged view of FIG. 10 .

In the picture:

Screw head 11 Rod body 12

Thread 13 Locking part 14

Incision 131 Upper crest 132

Lower tooth crest 133 Outer tooth crest 134

Tooth crest angle α vertex 135

Vertex Angle α’ Cutting Angle A

screw 1 object 2

Lock low resistance screw 3

Screw head 31 Rod body 32

The first thread 33 The peak surface of the first upper tooth 331

The first lower tooth crest surface 332 Locking part 34

Second thread 35 Second upper crest surface 351

The second lower tooth crest surface 352

Grooving B Flank B’

Angle of the first crest β Angle of the second crest θ

Detailed ways

In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples. Before the invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Fig. 4 to Fig. 7, the first preferred embodiment of the locking low-resistance screw 3 of the present invention includes a screw head 31, a rod body 32 extending from the screw head 31, and a plurality of helical rings arranged on the rod body 32 The first thread 33 and a locking portion 34 opposite to the direction of the screw head 31 and provided on the rod body 32; wherein, each first thread 33 has a first upper crest surface 331, and a The first lower crest surface 332 connected to the first upper crest surface 331; the junction of the first upper crest surface 331 and the first lower crest surface 332 intersects with a first crest angle β In particular, the helical ring on the rod body 32 is provided with a plurality of second screw teeth 35 that are divided into the first upper crest surface 331 and the first lower crest surface 332; wherein, each of the second screw teeth 35 There is a second upper crest surface 351 and a second lower crest surface 352 connected to the second upper crest surface 351; the second upper crest surface 351 and the second lower crest surface 352 are connected There is a second crest angle θ at the intersection; at the same time, the second upper crest surface 351 and the second lower crest surface 352 are respectively provided with a plurality of opposite slots B; moreover, the first crest clamping The angle β is smaller than the angle θ of the second tooth crest; it is worth mentioning that in this embodiment, the diameter d of the first thread 33 can be set to be smaller than the diameter D of the second thread 35, specifically As shown in FIG. 6 and FIG. 7 , the groove B is formed by at least two linear ribs B' converging.

Still as mentioned above, when the low-resistance locking screw 3 is locked on an object (not shown in the figure), a rotational torque is first applied to the screw head 31 to drive the locking portion 34 to lock into the object, To make the second thread 35 be able to cut the object, at this time, cooperate with the slots B provided on the second thread 35 to provide auxiliary turning of the object, and the chips after cutting can also be In addition, in view of the manner in which the first screw teeth 33 are arranged between the second screw teeth 35, and the setting of the first tooth crest angle β smaller than the second tooth crest angle θ, when When the screw is drilled and locked, the first thread 33 can firmly support the second thread 35 for drilling and cutting, so the characteristics of the strength of the second threads 35 can be effectively enhanced, and the locking effect is greatly improved. The cutting ability of the resistance screw 3, in order to achieve the effect of fast locking.

Furthermore, the combination of the first screw teeth 33 and the second screw teeth 35 can enhance the strength of the screw teeth and improve the cutting effect, effectively solving the problem of the locking low resistance screw 3 in the cutting process due to the The inappropriate setting angle of the groove B affects the lack of cutting effect, and the diameter d of the first thread 33 is smaller than the diameter D of the second thread 35. The first thread 33 and the second thread A better chip space can be formed between 35, and the chips after cutting can be quickly discharged, so as to achieve the effect of fast locking.

Referring to Fig. 4, Fig. 5 and Fig. 8, Fig. 9, the second preferred embodiment of the present invention, the locking low-resistance screw 3 still includes a screw head 31, a rod body 32, a plurality of first thread teeth 33, a lock Part 34 and a plurality of second screw teeth 35 and other components, and the effects of increasing strength, improving cutting ability, and fast locking are all the same as those described in the first embodiment, and will not be described in detail; especially, this embodiment For example, the diameter d of the first thread 33 is equal to the diameter D of the second thread 35; when locked, the first thread 33 with the smaller first crest angle β is combined with the first thread 33 The second thread 35 with the larger second crest angle θ can be used for the low-resistance locking screw 3 to better withstand stress during the cutting process, so as to increase the strength of the low-resistance locking screw 3 . Drill lock strength; moreover, the slot B still maintains a certain size of chip space, so that during the locking process, there will be no strong resistance due to excessive accumulation of chips, and the effect of fast locking can indeed be achieved.

Referring to Fig. 10 and Fig. 11, the third preferred embodiment of the present invention, the low-resistance locking screw 3 still includes a screw head 31, a rod body 32, a plurality of first thread teeth 33, a locking portion 34 and a plurality of Components such as the second thread 35, and the effects of increasing strength, improving cutting ability, and fast locking are all the same as those described in the first embodiment, and will not be described in detail; The slot B provided on the two screw teeth 35 is composed of a plurality of linear ribs B' relatively gathered; In addition to the best drilling lock strength, the groove B still maintains a certain size of chip space to reduce the locking resistance, and at the same time improve the cutting effect, and indeed achieve fast locking and other effects.

To sum up the above, the low-resistance locking screw of the present invention is provided with a plurality of opposite slots on the second threads, so as to assist the turning of objects and ensure the space for chips. The included angle of the crests strengthens the stress of the second thread, thereby improving the cutting ability of the locking low-resistance screw, thereby achieving the effect of fast locking, so the purpose of the present invention can indeed be achieved.

The above-mentioned embodiments and drawings do not limit the form and style of the product of the present invention, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims (3)

1. A locking low-resistance screw, comprising a screw head, a rod body extending from the screw head, a plurality of helical rings provided on the first screw thread on the rod body, and a screw thread opposite to the direction of the screw head and located on the rod body The upper locking portion; each first thread has a first upper crest surface and a first lower crest surface connected to the first upper crest surface; the first upper crest surface and the first crest surface The junction of the first lower tooth crest surface intersects with a first tooth crest angle; it is characterized in that: The helical ring on the rod body is provided with a plurality of second thread teeth that are separately arranged on the first thread thread, so that the first thread threads can be arranged between the second thread threads, so that the first thread thread can support the first thread thread. Two screw teeth; each second thread has a second upper crest surface on the first upper crest surface and a second upper crest surface on the first lower crest surface and connected to the second upper crest surface The second lower crest surface connected with the second crest surface; the junction of the second upper crest surface and the second lower crest surface intersects with a second crest angle; the second upper crest surface and the second crest surface The lower crest surface is provided with a plurality of opposite grooves formed by gathering linear flanks; the included angle of the first crest is smaller than the included angle of the second crest. 2. The low-resistance locking screw according to claim 1, wherein the diameter of the first thread is smaller than the diameter of the second thread. 3. The low-resistance locking screw according to claim 1, wherein the diameter of the first thread is equal to the diameter of the second thread.