CN2411375Y

CN2411375Y - Improved wood screw

Info

Publication number: CN2411375Y
Application number: CN 00205757
Authority: CN
Inventors: 徐国泰
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-18
Filing date: 2000-02-18
Publication date: 2000-12-20
Anticipated expiration: 2010-02-18

Abstract

The utility model relates to a wood screw. The utility model mainly has the structure that screw threads on the screwing end are provided with cutting screws of a cutting tooth, and the maximum outer diameter of the cutting screws is smaller than the maximum outer diameter of the screw of a flat section and is smaller than the three-quarter height of a screw tooth of the flat section. Consequently, the wood screw can be prevented from being directly and hard squeezed with a work piece to produce fissure or crack; simultaneously, the engaging strength of the screwed screw teeth of the screw and the work piece is improved.

Description

The wood screw of improvement

The utility model relates to a kind of wood screw.

At present, as shown in Figure 6, wood screw 1 the earliest utilizes on the screw terminal 11 and straight plate 12 that is cone-shaped, the screw thread 13 that is connected with, it can be forced screws in the working substance, this wood screw adopts the compulsory type that does not have cutting to screw in, event is often squeezed wooden working substance firmly and is split, so checking and approving No. 273277 and No. 301373 to the Taiwan application already, the creator can improve above-mentioned shortcoming, promptly on cone-shaped screw terminal 11, be provided with a cutting slot 14, as shown in Figure 7, utilize cutting slot 14 when screw-in screws in timber fast, can earlier it be done a cutting boring, making screw-in is not to force fully to clamp-on, slightly expand in the screw-in workpiece again and can form an aperture earlier, so can significantly avoid screwing in and produce the shortcoming that hard squeeze crack is opened in the action, guarantee the soundness of workpiece combination, cutting slot 14 can't be finished when screw machine shaping simultaneously, must deliver to the Milling Process that other factories carry out cutting slot 14 in addition again, except that the cost that increases Milling Process, up and-down carrying is quite heavy busy, and also can produce certain loss in the course of working, wherein, adding the situation that also has spiral 13 impaired distortion man-hour in clamping takes place.

In addition, because cutting slot 14 biasing is on one side, so the cutting situation when screwing in can produce eccentric phenomenon, the strength inequality, it is bigger to increase the resistance of cutting and inconvenience and cutting ratio, has the situation of clamping stagnation obstruction.

In view of this, the purpose of this utility model provides a kind of wood screw of improvement, and it is to borrow the spiral tooth top on the cone-shaped screw terminal directly to form the flexuose cutting teeth, has cutting boring during for screw-in and expands spiral goove.

The purpose of this utility model is achieved in that a kind of wood screw of improvement, constitute by cone-shaped screw terminal and flat segments, which is provided with continuous spiral, it is characterized in that: the screw thread of screw terminal has the maximum outside diameter of cutting spiral, this cutting spiral of cutting teeth less than the maximum outside diameter of the spiral of flat segments, and is below 3/4ths of height of thread of flat segments; Described cutting teeth is pressed screw-in direction and is formed flexuose; Described cutting teeth has the helix angle of inclination.

Because employing such scheme: can prevent the directly hard workpiece that squeezes of wood screw, to produce crack or be full of cracks, the thread keying strength that while wood screw and workpiece screw improves.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 the utility model first embodiment's schematic representation;

Fig. 2 the utility model first embodiment's partial enlarged drawing;

Fig. 3 the utility model first embodiment's part sectioned view;

Fig. 4 the utility model first embodiment's worm's eye view;

Fig. 5 the utility model second embodiment's schematic representation;

A kind of wood screw schematic representation of commonly using of Fig. 6;

Fig. 7 another kind is commonly used the wood screw schematic representation.

At first, as shown in Figure 1, the cutting spiral 22 on first embodiment's wood screw 2 screw terminals 21 forms equidistant cutting teeth 23 and extends to flat segments 24 places one segment distance and is connected with spiral 25.

Shown in Fig. 2-4, the maximum outside diameter A1 of the cutting spiral 22 of screw terminal 21 is more smaller than the spiral 25 maximum outside diameter A2 of flat segments 24, be about tooth high 3/4ths and angle of thread Q1 less than Q2, its cutting teeth 23 is towards the zigzag fashion of cutting direction, this cutting teeth 23 has the helix angle of inclination, is beneficial to spiral and imports.

As shown in Figure 5, second embodiment is provided with to face upward curviserial several sliver 26 at the bottom of tooth, to increase the function of cutting and dust lead.

Borrow the structure of said elements to form, when screw terminal 21 begins to screw in workpiece simultaneously, at first utilize cutting teeth 23 when advancing, to cut spiral goove simultaneously, it cuts the fine powder bits that get off then can be a part of by discharging at the bottom of the tooth, also some compels to squeeze in space at the bottom of the tooth, makes whole screw-in work quick and laborsaving quite easily; When the spiral 25 of flat segments 24 screws in, has spiral goove owing to be cut tooth 23 cuttings, make the spiral 25 of this section be easy to import and the maximum outside diameter A1 of spiral 25 greater than the maximum outside diameter of cutting spiral 22, so crest still can produce the urgent screw-in of suitable intensity to workpiece such as timber, and the adhesive strength that can not detract.

In sum, the utlity model has following advantages:

1, forms the cutting teeth of spiral inclination on the screw cutting that screw terminal has, can compel incipient The tight expansionary phase continues working substance is carried out spiral cutting and discharges a part of cutting, makes revolving of its screw Enter comparatively fast and easily, more can not produce completely to workpiece that hard squeezing screws in, so can avoid screwing in by force Produce the situation of be full of cracks.

2, owing to cut the maximum gauge of spiral less than the maximum gauge of the general screw thread of flat segments, so straight The section be threaded into after have enough interlock spiral tightnesses, to guarantee the bond strength of work.

3, the cutting spiral cooperates the cutter of processing to finish simultaneously when screw forming, does not need to arrive in addition machine again Platform or factory process can reduce unnecessary trouble and loss, more can reduce cost and reach required Effect.

4, utilize the cutting teeth of cutting spiral, it is powdered when screwing in workpiece to be done upper cut, and then the part smear metal can be discharged at the bottom of tooth, gives birth to the crack with the minimizing forced labor that is squeezed.

What 5, produce fritters bits except that can be by discharging at the bottom of the tooth, part can be by refinement and attached to filling and leading up in the space for reaching the cutting of discharging, make screw and workpiece do the most suitable combining closely, do not push screw-in firmly, do not split or detract adhesive strength so can not produce but can not produce overexpansion.

6, because cutting teeth is evenly distributed on the cutting spiral, when screwing in cutting, the average and resistance of strength can significantly reduce, and to be easy to lathe turner and combination, is three-dimensional cutting.

Claims

1, a kind of wood screw of improvement, constitute by cone-shaped screw terminal (21) and flat segments (24), which is provided with continuous spiral, it is characterized in that: the screw thread of screw terminal (21) has the maximum outside diameter (A1) of cutting spiral (22), this cutting spiral (22) of cutting teeth (23) less than the maximum outside diameter (A2) of the spiral (25) of flat segments (24), and is below 3/4ths of height of thread of flat segments (24).

2, by the wood screw of the described a kind of improvement of claim 1, it is characterized in that: described cutting teeth (23) is pressed screw-in direction and is formed flexuose.

3, by the wood screw of the described a kind of improvement of claim 1, it is characterized in that: described cutting teeth (23) has the helix angle of inclination.