CN2246210Y

CN2246210Y - Improved screw

Info

Publication number: CN2246210Y
Application number: CN 95246620
Authority: CN
Inventors: 林年盛
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-11
Filing date: 1995-12-11
Publication date: 1997-01-29
Anticipated expiration: 2005-12-11

Abstract

The utility model discloses an improved screw, relating to a screw, comprising a head cap and a spiral thread part. The proper position of threads is formed with a convex part slightly bulged outwards and a concave part slightly recessed inwards. The inner circumference of the bottom surface of the head cap is provided with a ratchet surface. The screw having the structure can nail an object to be fixed on the wall surface of concrete or other structures. The utility model has favorable clamping effect, and the object to be fixed can be fixed on a working surface firmly for a long term.

Description

The screw of Improvement in Shape

The screw of a kind of Improvement in Shape of the utility model relates to screw.

Prior art, as Fig. 6, shown in 7, screw A comprises head cap and the uniform screw section of the spiral helicine external diameter of tool, during use, its form of construction work is to be drilled with the sliding C in hole on mixed earth wall earlier, and the fastener B that will be fixed again utilizes screw A, and it is followed closely on wall, when the wall structure comparatively robust, and when working substance is static, effect still can, but when wall comparatively soft, and under the situation of working substance for the moving pipeline D of high pressure string, then relatively smooth because of the surface of contact of the screw A of the even major diameter of thread of tool and concrete hole, it is not enough that clip intensity just seems, very easily comes off in attacking the process of work.

The purpose of this utility model is to provide a kind of screw that has preferable clip effect when mixing on the earth wall with being invested by the earnest nail that has.

The utility model be achieved in that screw comprise head cap and and the spiral helicine screw section of tool, the suitable position of screw thread forms the protuberance of an outside dimpling and the recess of an inside nick.The bottom surface inner circumference edge of head cap is provided with ratchet face.

The utility model screw, because the suitable position of its screw thread has protuberance and recess, when the fixation nail is invested the wall of mixed earth (or other structure), screw is concavo-convex card mutually with contacting of concrete wall face hole, so screw has preferable clip in conjunction with effect, makes fixation be able to firmly be fixed on the working surface for a long time.

The following drawings and embodiment will be described further technical characteristics of the present utility model:

Fig. 1 is front elevation of the present utility model and worm's eye view.

To be the utility model be fixed in action diagram one in the cinclides with fixation to Fig. 2.

To be the utility model be fixed in action diagram two in the cinclides with fixation to Fig. 3.

To be the utility model be fixed in action diagram three in the cinclides with fixation to Fig. 4.

Fig. 5 is that the track local section that screw thread protuberance of the present utility model moves in cinclides cuts open

View.

Fig. 6 is existing screw planimetric map.

Fig. 7 is that existing screw is in the sectional view of soft wall.

Embodiment:

As shown in Figure 1, the utility model screw has head cap 12, and screw thread 14 is a helical, and the suitable position of screw thread 14 forms the protuberance 16 of an outside dimpling and the recess 18 of an inside nick; The bottom surface inner circumference edge of head cap 12 is provided with ratchet face 19.

When the utility model uses, as Fig. 2,3, shown in 4, when being fixed in pipe fitting 50 on the wall, be to hammer into shape among the hole P that goes into to be drilled with in advance with screw 10 cross-under fasteners 30 and with screw 10, when screw 10 is hammered into shape fashionable, screw thread 14 is to screw in the inwall of the mode contact hole P of spiral, if this moment, the structure of hole wall did not belong to more soft by force, the clip strength deficiency of screw thread then, but protuberance 16 can be brought into play great effect, and as shown in Figure 5, protuberance 16 is fashionable by hammer, because the little internal diameter of external diameter greater than hole P, so be powerful contact with hole wall to push advance, protuberance 16 makes hole wall that different distortion be arranged, and makes hole wall not only have many parts and protuberance 16 to be right after, simultaneously also form the recess 18 that many parts snap in screw thread, thereby the clip power of screw in cinclides is increased greatly; And for example Fig. 5 hole wall is by being absorbed in shown in the track 40 that protuberance 16 contacts are advanced, and behind the location, protuberance 16 is able to the clip hole wall, and the clip strength of whole screw is strengthened.This shows, even if the more soft effect that also can reach high firm clip pipe fitting 50 of hole wall system.Shown in Fig. 2,3,4 because ratchet face 19 clips even be absorbed on the peritreme face 32 of fastener 30, make head cap 12 be able to firm and fastener 30 more fluid-tight engagement be one, make fastener fixed fitting 50 more firmly.

Claims

1. the screw of an Improvement in Shape, comprise head cap and and tool spiral thread portion, it is characterized in that the suitable position of screw thread forms the protuberance of an outside dimpling and the recess of an inside nick.

2. the screw of Improvement in Shape according to claim 1 is characterized in that the bottom surface inner circumference edge of head cap is provided with ratchet face.