CN2738020Y - Sawtooth thread screw - Google Patents

Abstract

The utility model discloses a screw with sawtooth thread, which mainly comprises a first and a second screw thread segment on a rod body, and a crest angle of the first screw thread segment is greater than a crest angle of the second screw thread segment. At the same time, a plurality of recessed parts are provided on the screw thread, and a cutting edge is formed between any two recessed parts, and the cutting edge is arranged obliquely with respect to the crest center, so that the cutting edges can be arranged in a staggered manner to form a sawtooth shape. Therefore, when locking, in addition to enabling the screw thread at the beginning of the tip to withstand the torque at the initial stage of locking to avoid damage, the recessed part and the cutting edge are used for rapid shearing to achieve a rapid locking effect.

Description

Serrated thread screws

technical field

The utility model relates to a screw, in particular to a screw with a zigzag thread.

Background technique

Referring to Fig. 1, the conventional screw 1 includes a screw head 11, a rod body 12 connected with the screw head 11, and a plurality of screw rings arranged on the rod body 12 such as screw teeth 13; wherein, the screw teeth 13 are A plurality of recessed parts 131 are opened, and a cutting edge 132 is formed between any two recessed parts 131 , so that the thread 13 is in the shape of a gear.

When the screw 1 is locked to an object 10, the concave portion 131 and the cutting edge 132 formed on the screw 13 can make the spirally surrounded screw 13 be in the shape of a gear, so that the wood fiber can be effectively cut, In order to reduce the locking resistance, it is convenient for the screw 1 to quickly lock into the object 10, and at the same time, the sawdust generated by cutting will accumulate in the gap formed by the screw teeth 13, so as to achieve the functions of locking and positioning.

However, after actual use, it is found that the screw 1 still has the following points to be improved, which are described in detail as follows:

1. Since the screw 1 cuts the object 10 with the help of the integrally formed thread 13 to achieve the effect of screwing in the rod body 12, it can be seen that the screw 1 wants to achieve locking and positioning, which depends entirely on the sharpness of the thread 13 formed by rubbing , that is, the forming angle of the thread 13 is small. When the angle between the thread 13 is small, the thickness of the thread 13 is thinner, and the cutting sharpness increases, which can improve the cutting effect of the thread 13. Relatively, it will make the thread 13 The locking torque that the thread 13 can withstand is reduced, and the thread 13 at the beginning of the tip is an incomplete thread, so that the thread 13 cannot bear the initial torque at the beginning of locking, resulting in The starting point of thread 13 is easy to be damaged, which affects the threading of guide rod body 12 into object 10, resulting in more laborious locking process, which needs to be improved.

2. Continuing from the above, when the included angle of the thread 13 is large, the thickness of the thread 13 is thicker, and its locking torque tolerance is increased, so it can withstand the torque generated at the initial stage of locking, and avoid the twist at the beginning of the tip. If the screw teeth 13 are damaged, the sharpness of the screw teeth 13 will be reduced relatively, and the screw teeth 13 will not be able to effectively cut off the wood fibers. The cut wood fiber is very easy to apply pressure on the rod body 12 due to the stretching tension, so that during the locking process, the builder needs to apply a large screw-in torque to allow the rod body 12 to be screwed into the object 10 smoothly. In addition to causing construction inconvenience, it also affects the locking efficiency.

Utility model content

The purpose of the utility model is to provide a zigzag threaded screw with fast locking and reduced locking torque.

In order to achieve the above object, the technical solution of the utility model is: a screw with zigzag thread, which includes a screw head, a rod body arranged on the screw head, and a plurality of spiral rings arranged on the rod body. The rod body has a second thread section adjacent to the screw head, and a first thread section opposite to the second thread section, and each thread of the first and second thread sections has an upper and a lower cutting surface, And the upper and lower cutting surfaces meet to form a crest, and the thread is provided with a plurality of depressions, and a cutting edge is formed between any two depressions; wherein: the crest of the first thread section The included angle is greater than the included angle of the crest of the second thread segment, and at the same time, the cutting edge is inclined to the center of the crest, and each cutting edge is arranged in a staggered manner.

The crest angle of the second thread segment is 40 degrees, and the crest angle of the first thread segment is 60 degrees.

The recess and the cutting edge are only formed on the second thread segment.

The depressed portion is V-shaped.

The cutting edge is pointed.

After adopting the above scheme, the utility model is compared with the prior art, and it can be known that the utility model has the following advantages and effects:

1. Since the crest angle of the first thread segment is larger than the crest angle of the second thread segment, the first thread segment can withstand a large locking torque at the initial stage of locking, avoiding the tip Damage to the crests of the threads at the start will help guide the closure process.

2. Continuing from the above, since the first thread section can bear the torque generated at the initial stage of locking, the situation of the crest of the tooth being damaged is avoided, and the thread of the second thread section is formed with a concave portion and a cut and the cutting edge is also inclined to the center of the tooth crest, so that the cutting blades can be arranged in a staggered manner, so that the tooth crest forms a zigzag shape that is staggered up and down, so that the object can be cut quickly and effectively, thereby reducing the locking resistance The production of the rod body to facilitate the screwing of the rod body into the object will make the locking process more labor-saving and faster.

Description of drawings

Fig. 1 is a schematic diagram of a state of use of a conventional screw;

Fig. 2 is a three-dimensional schematic view of the first preferred embodiment of the utility model;

Fig. 3 is the enlarged schematic view of the second preferred embodiment of the utility model;

Fig. 4 is a partially enlarged schematic diagram of the thread of the first preferred embodiment of the present invention;

5 is an enlarged schematic view of a third preferred embodiment of the present invention;

6 is an enlarged schematic view of a fourth preferred embodiment of the present invention;

Fig. 7 is a schematic diagram of the locking state of the first preferred embodiment of the present invention.

Detailed ways

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same numerals.

Referring to shown in Fig. 2, it is the first preferred embodiment of the present utility model, and this screw 2 comprises a screw head 21, a rod body 22 that is located on the screw head 21, and the screw that most helical rings are located on the rod body 22 tooth 23; wherein, the rod body 22 has a second thread segment 222 adjacent to the screw head 21, and a first thread segment 221 opposite to the second thread segment 222, while the first and second thread segments 221, Each screw tooth 23 of 222 can be the screw tooth shape such as square tooth or pointed tooth, no matter square tooth or pointed tooth all has an upper and lower cutting surface 231,232, and this upper and lower cutting surface 231,232 phase A crest 233 is formed in succession, which will be described as pointed teeth below; in particular, the included angle α of the crest 233 of the first thread segment 221 is greater than the angle θ of the crest 233 of the second thread segment 222, and in this implementation In the example, the angle α of the crest 233 of the first thread segment 221 is represented by 60 degrees, and the angle θ of the crest 233 of the second thread segment 222 is represented by 40 degrees.

Continuing from the foregoing, the thread 23 is provided with a plurality of recesses 234, and the recesses 234 are only formed on the second thread segment 222 in this embodiment, of course, the form of the recesses 234 can also be formed by the first The second thread segment 222 extends to the position of the first thread segment 221 (not shown in the figure), and the concave portion 234 can also form a V-shaped design as shown in FIG. 3 in addition to the shape shown in this embodiment. , the following description of this embodiment is only illustrated by taking FIG. 2 as an example; moreover, a cutting edge 235 is formed between any two recessed parts 234, and each cutting edge 235 is in the shape of a gear. Referring to FIG. 4, the The cutting edge 235 is inclined to the center of the tooth peak 233, and the cutting edge 235 is arranged in a staggered manner as shown in the figure; of course, in addition to the pattern shown in this embodiment, it can also be used as shown in Figure 5 or Figure 6 The pointed cutting edges 235 shown form an interlaced sawtooth pattern.

Referring to Fig. 4 and Fig. 7, when the screw 2 performs locking operation, since the included angle α of the crest 233 of the first thread segment 221 is greater than the angle θ of the crest 233 of the second thread segment 222, the second thread segment 222 The thread 23 of a thread segment 221 can withstand the relatively large torque generated at the initial stage of locking, so as to avoid damage to the crest 233 of the thread 23 at the beginning of the tip, and at the same time cooperate with the cutting edge 235 during the locking process to form a The up and down staggered zigzag design can quickly and effectively cut the object 20 to reduce the generation of locking resistance, so as to achieve a fast locking effect.

To sum up the foregoing, the utility model uses the angle between the crests of the first thread section to be greater than the angle between the crests of the second thread section, and at the same time, there are a plurality of depressions on the thread, and any two depressions A cutting edge is formed between them, and the cutting edge is inclined to the center of the tooth crest, so that the cutting edges can be arranged in a zigzag shape in a staggered manner, so that the thread can withstand the torque at the initial stage of locking, so as to avoid the tooth crest In the event of damage, it can effectively and quickly cut the object to reduce the generation of locking resistance.

Claims (5)

1. A screw with zigzag thread, which includes a screw head, a rod body arranged on the screw head, and a plurality of spiral rings arranged on the rod body, and the rod body has a second screw tooth adjacent to the screw head segment, and the first thread segment of the opposite second thread segment, and each thread of the first and second thread segments has an upper and lower cutting surface, and the upper and lower cutting surfaces meet to form a tooth Peak, and a plurality of depressions are opened on the thread, and a cutting edge is formed between any two depressions; it is characterized in that: The included angle of the crests of the first thread section is larger than the included angle of the crests of the second thread section, and the cutting edge is inclined to the center of the crest, and each cutting edge is arranged in a staggered manner. 2. The screw with zigzag thread according to claim 1, wherein the crest angle of the second thread section is 40 degrees, and the crest angle of the first thread section is 60 degrees. 3. The screw with serrated thread according to claim 1, characterized in that: the concave portion and the cutting edge are only formed on the second thread segment. 4. The screw with zigzag thread according to claim 1, wherein the concave part is V-shaped. 5. The screw with serrated thread according to claim 1, wherein the cutting edge is pointed.

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