CN2846856Y

CN2846856Y - Screw

Info

Publication number: CN2846856Y
Application number: CN 200520122830
Authority: CN
Inventors: 苏国材
Original assignee: LAIXIANG CO Ltd
Current assignee: LAIXIANG CO Ltd
Priority date: 2005-09-30
Filing date: 2005-09-30
Publication date: 2006-12-13
Anticipated expiration: 2015-09-30

Abstract

The utility model discloses a screw, which is characterized in that the free end of a rod body is annularly provided with a first tooth section, and an opposite second tooth section of the free end; meanwhile, the first and the second tooth sections are arranged in the opposite direction; moreover, the outer diameter of the screw thread of the first tooth section is larger than the outer diameter of the screw thread of the second tooth section; furthermore, the angle of the screw thread tooth peak of the first tooth section is smaller than the angle of the screw thread tooth peak of the second tooth section. Therefore, when the utility model is locked, the first tooth section can cut and enter the wood at a high speed conveniently so as to accelerate the locking speed, while the second tooth section presses cutting chips after cutting. The cutting chips can be prevented from extending outside convexly. Moreover, the cutting chips are coated around the second tooth section and can combine the second tooth section with objects effectively. Therefore, the locking and fastening force can be enhanced.

Description

Screw

Technical field

The utility model is about a kind of screw design, the screw that particularly a kind of sealed speed is fast and sealed fastening force is good.

Background technique

Existing often composite material 2 (as the mixing of rubber with wood chip) being stacked and placed on engaged the back use on the timber 3, and the joint method kind is numerous as gummed, chimeric, screw closure etc., the present has been looked into No. 6666638 patent case of a U.S. just with locking mode, and aforementioned this composite material 2 is engaged use with timber 3.

Consult Fig. 1,2, it is No. 6666638 patent case of the U.S., it states a kind of screw 1 that is locked on composite material 2 (as mixing of rubber and wood chip) and timber 3 clearly, this screw 1 includes a spiral shell head 11, one is located at the body of rod 12 on the spiral shell head 11, and a whorl is located at the thread unit 13 on this body of rod 12; Wherein, the end that this body of rod 12 does not set firmly is formed with a free end 121, and aforementioned this thread unit 13 also has the first tooth section 131 of nearly this free end 121, with second a tooth section 132 in contrast to this free end 121, simultaneously this first, two tooth sections 131,132 do not interconnect, this first tooth section 131 is a right-hand thread in addition, and this second tooth section 132 is the left hand screw thread, particularly, the thread outer diameter D 1 of this first tooth section is less than the thread outer diameter D 2 of this second tooth section, and the thread tooth peak angle [alpha] of this first tooth section, pitch P1 is greater than the thread tooth peak angle beta of this second tooth section, pitch P2, in addition this first, two tooth sections 131,132 on this body of rod 12 and be equipped with a projection 14.

Cooperate and consult Fig. 2, the sealed initial stage, bestow this spiral shell head 11 1 rotary torsions earlier, after driving these first tooth section, 131 these composite materials 2 of screw-in, this first tooth section 131 is passed this composite material 2 again and is screwed in this timber 3, establish by the ring of this projection 14 this moment, so that this timber 3 and these composite material 2 fluid-tight engagement, this second tooth section 132 also begins to screw in this composite material 2 simultaneously, and utilize the design of these second tooth section, 132 left hand screw threads, the ribbon and the smear metal of timber 3 that will cutting produce this composite material 2 push back in the lump in this composite material 2 and the timber 3 and finish sealed action.

The right actual back of using finds that No. 6666638 patent case 1 of this U.S. still has not attain improves part, and details are as follows now:

1, sealed speed is not good:

Because the thread tooth peak angle [alpha] of this first tooth section is bigger, just can't apace this composite material 2 be cut with timber 3 when therefore sealed and be entered, the wood fiber wrapping phenomena that easily causes this timber 3, the thread outer diameter D 2 of adding this second tooth section is also big than the first tooth section, and second tooth section 132 be the left hand screw thread so, so this second tooth section 132 of sealed process can't produce any cutting, cause the more shape increase of sealed resistance, cause No. 6666638 sealed speed of patent case of this U.S. significantly to reduce.

2, fastening force is not good:

Because the outer diameter D 1 of this first tooth section is less, therefore sealed after only this second tooth section 132 can be secured on this composite material 2, and this first tooth section 131 just can't effectively fastening this timber 3 on, cause this composite material 2 and timber 3 that the anxiety of disengaging is arranged.

The model utility content

The purpose of this utility model provides a screw, and it has the effect that can promote sealed speed and increase sealed fastening force.

For achieving the above object, solution of the present utility model is: a kind of screw, and it includes a spiral shell head, and one is located at the body of rod on the spiral shell head, and a whorl is located at the thread unit on this body of rod; Wherein, the end that this body of rod does not set firmly is formed with a free end, and aforementioned this thread unit also has nearly this free-ended first tooth section, with one in contrast to this free-ended second tooth section, this first and second tooth Duan Wei interconnects simultaneously, the screw thread of this first tooth section and this second tooth section is the opposite direction setting in addition, and wherein: the thread external diameter of this first tooth section is greater than the thread external diameter of this second tooth section, and the thread tooth peak angle of this first tooth section is less than the thread tooth peak angle of this second tooth section.

Wherein the pitch of this second tooth section is less than the pitch of this first tooth section.

Wherein this body of rod is positioned at the intersegmental anodontia section that is equipped with of this first and second tooth.

After adopting such scheme, the utility model is less by the thread external diameter of the thread tooth peak angle of the first tooth section and this second tooth section, so can produce sharp cutting effect respectively and reduce the friction effect, and then significantly promote outside the sealed speed, be the left hand screw thread design also simultaneously because of the thread external diameter of this first tooth section reaches this second tooth section more greatly, but just fluid-tight engagement of composite material after therefore sealed and timber.

Description of drawings

Fig. 1 is the schematic representation of No. 6666638 patent case of the U.S.;

Fig. 2 is the locked state schematic representation of No. 6666638 patent case of the U.S.;

Fig. 3 is the schematic representation of the utility model preferred embodiment; And

Fig. 4 is the locked state schematic representation of the utility model preferred embodiment.

The explanation of primary clustering conventional letter

4 screws, 41 spiral shell heads, 42 bodies of rod, 43 thread unit

421 free ends, 431 first tooth sections, 432 second tooth section D3, D4 external diameter

P3, P4 pitch γ, θ tooth angle 44 projections, 5 composite materials

6 timber

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present utility model, in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly understand.

Consult Fig. 3, the preferred embodiment of the utility model screw 4, it includes a spiral shell head 41, one is located at the body of rod 42 on the spiral shell head 41, and one whorl be located at thread unit 43 on this body of rod 42, wherein, the end that this body of rod 42 does not set firmly is formed with a free end 421, and aforementioned this thread unit 43 also has the first tooth section 431 of nearly this free end 421, with second a tooth section 432 in contrast to this free end 421, this first and second tooth section 431,432 does not interconnect simultaneously, and this first tooth section 431 is a right-hand thread in addition, and this second tooth section 432 is the left hand screw thread; Particularly, the thread outer diameter D 3 of this first tooth section is greater than the thread outer diameter D 4 of this second tooth section, and the thread tooth peak angle γ of this first tooth section is less than the thread tooth peak angle θ of this second tooth section, this body of rod 42 is positioned at this 431,432 of first and second tooth section and is equipped with an anodontia section 44 simultaneously, in addition the pitch P4 of this second tooth section and less than the pitch P 3 of this first tooth section.

Cooperate and consult Fig. 4, the sealed initial stage is bestowed this spiral shell head 41 1 rotary torsions earlier, screw in this composite material 5 to drive this first tooth section 431, this moment is by the less sharp cutting effect that produces of thread tooth peak angle γ of this first tooth section, and effectively sheared the ribbon of this composite material 5, then this first tooth section 431 is just passed this composite material 5 to screw in this timber 6, this moment is by the setting of this anodontia section 44, so that this composite material 5 and timber 6 fluid-tight engagement, and cooperate the thread outer diameter D 3 of this first tooth section big than the thread outer diameter D 4 of this second tooth section, relatively this first tooth section 431 can just increase by ccontaining chip volume, will help this first tooth section 431 of lifting and be anchored on this timber 6.

Moreover, in the time of these anodontia section 44 effects, this second tooth section 432 also begins to screw in this composite material 5, less in order to do facility with the outer diameter D 4 of this second tooth section, contact to promote sealed speed with this composite material 5 and reduce, and be equipped with the design of these second tooth section, 432 left hand screw threads, so will cut this composite material 5 pushes back in this composite material 5 with ribbon and the wood chip that timber 6 produces, while is by the elastic-restoring force of this composite material 5, be coated on around this second tooth section 432 in order to do just ribbon and wood chip, so this second tooth section 432 just can be anchored on this composite material 5, so that this composite material 5 and timber 6 fluid-tight engagement.

By above-mentioned explanation, and relatively, when learning that the utility model has following listed advantage and an effect with known really with the utility model and known work one:

1, sealed fast:

The sealed initial stage, because the thread tooth peak angle of this first tooth section is less, therefore in sealed process, just can produce sharp cutting effect, in order to do just effectively shearing the ribbon of this composite material and the wood fiber of timber, and in view of the thread external diameter of this second tooth section less, contacting so can reduce with this composite material when sealed, is just can significantly promote sealed speed in the sealed process of the utility model.

2, promote sealed fastening force:

Because the thread external diameter of this first tooth section is bigger, relatively this first tooth section can just increase by ccontaining chip volume, to help this first tooth section of lifting is anchored on this timber, and in view of this composite material has elastic-restoring force, be with when this second tooth section screws in this composite material, cooperate this second tooth section will cut the ribbon that this composite material produces and push back in this composite material, thus this second tooth Duan Yike be anchored on this composite material so that this composite material and timber fluid-tight engagement.

Conclude aforementioned, the utility model is less by the thread external diameter of the thread tooth peak angle of the first tooth section and this second tooth section, so can produce sharp cutting effect respectively and reduce the friction effect, and then significantly promote outside the sealed speed, be the left hand screw thread design also simultaneously because of the thread external diameter of this first tooth section reaches this second tooth section more greatly, but composite material after therefore sealed and timber is fluid-tight engagement just, so can reach the purpose of this utility model really.

The above person of thought, only be explanation preferred embodiment of the present utility model, when not limiting the scope that the utility model is implemented with this, promptly the simple equivalent of doing according to the utility model claim scope and description generally changes and modifies, and all should still belong in the scope that the utility model patent contains.

Claims

1, a kind of screw, it includes a spiral shell head, and one is located at the body of rod on the spiral shell head, and a whorl is located at the thread unit on this body of rod; Wherein, the end that this body of rod does not set firmly is formed with a free end, and aforementioned this thread unit also has nearly this free-ended first tooth section, with one in contrast to this free-ended second tooth section, this first and second tooth Duan Wei interconnects simultaneously, the screw thread of this first tooth section and this second tooth section is the opposite direction setting in addition, it is characterized in that:

The thread external diameter of this first tooth section is greater than the thread external diameter of this second tooth section, and the thread tooth peak angle of this first tooth section is less than the thread tooth peak angle of this second tooth section.

2, screw as claimed in claim 1 is characterized in that: the pitch of this second tooth section is less than the pitch of this first tooth section.

3, screw as claimed in claim 1 is characterized in that: this body of rod is positioned at the intersegmental anodontia section that is equipped with of this first and second tooth.