CN2437894Y - Metal flat head expansion screw - Google Patents

Abstract

The utility model discloses a metal crew cut inflation screw. When the existing metal expansion screw is used, a nut and a screw rod of the existing metal expansion screw often protrude out of a wall body, so that the appearance is influenced, the technical requirements of some projects cannot be met, and the plastic expansion screw is too low in strength and easy to separate from a fixed object when the fixed object is too heavy. And the utility model discloses be provided with the inflation nut 3 that complex appearance is round platform shape or frustum of a sphere shape with it at the inner end of screw rod 1, screw rod 1, inflation nut 3 can expand expansion sleeve 2, fixes the object on the wall body, and the utility model discloses a nut 1-1 can not be outstanding in the object surface, does not influence pleasing to the eye, can satisfy the technical requirement of some engineering.

Description

A kind of metal tack setscrew

The utility model relates to a kind of metal tack setscrew.

Setscrew is of many uses in daily life, when particularly fixing, installing some facility in house decoration or on wall, can not lack especially.Setscrew commonly used at present has two kinds of forms, and a kind of is the expansion of metal screw that comprises expansion sleeve, screw rod and nut that is made of metal, and another kind is by the plastic expansion screw of being made up of the plastic expansion micelle and the metallic screw of non-return sheet.The end that preceding a kind of its screw rod is filled in the wall hole is thick gradually, along with nut screws and the distending expansion sleeve, thereby setscrew is fixed in the wall hole.The plastic expansion micelle of plastic expansion screw can be filled in the wall hole, when screwing metallic screw, plastic expansion micelle distending under the effect of non-return sheet, can be fixed on object on the body of wall.The setscrew of these two kinds of forms for object is fixed on the body of wall, all is effective.When but the expansion of metal screw was fixed on the body of wall, its screw rod and nut protruded in outside the body of wall, and one side influences attractive in appearance, and when needing flat screw as installation indoor split-type air conditioner, aluminum window etc. on the other hand, it is inapplicable just to seem.And the plastic expansion screw is when being fixed on body of wall with object, though its screw cap is a tack, it is made of the plastics micelle after all, and intensity is little, and fixing object is easy to when overweight.

The purpose of this utility model just provides a kind of metal tack setscrew, to overcome above-mentioned the deficiencies in the prior art.

For achieving the above object, the utility model has been taked such measure, a kind of metal tack setscrew, have the screw rod of screw thread by nut one end and be enclosed within the outer expansion sleeve of screw rod by an end and form, to be provided with it the profile that cooperates be the expanding nut of frustoconic shape to a threaded end on screw rod, and the outer side surface of expanding nut is provided with the 1-4 sheet and only revolves fin.

Take the utility model of above-mentioned measure, one end plug that expanding nut can be cooperated with screw rod is gone in the wall hole, screw rod upper cap nut one end promptly exposes outside the wall hole, screw screw rod, expanding nut gets final product the distending expansion sleeve, thereby setscrew or object are fixed on the body of wall, because the nut on the screw rod can be done than book as required, behind the fixed object, outside the object that the outstanding body of wall of nut maybe need be fixed, in addition can be substantially and object surfaces or surface of wall fair, thereby do not affect the appearance, be more suitable for installing object or the equipment that needs flat screw as indoor apparatus of air conditioner or aluminum window etc., can satisfy the technical requirements of some engineering.Though the utility model just improves on prior art slightly, its effect is significant, and implementation methods and prior art are basic identical, thus implement easily, with low cost.

The utility model is described in further detail below in conjunction with drawings and embodiments:

Fig. 1 is the utility model plan view:

Fig. 2 is the A-A cut-away view of Fig. 1;

Fig. 3 is the B-B cut-away view of Fig. 1;

Fig. 4 is the utility model right elevation;

Fig. 5 is the utility model expanding nut plan view;

Fig. 6 is the utility model expanding nut left view.

Shown in above-mentioned accompanying drawing, the utility model is by screw rod 1, expansion sleeve 2 and expanding nut 3 are formed, one end of screw rod 1 has cross recessed nut 1-1, the other end has screw thread 1-2, expansion sleeve 2 is enclosed within outside the screw rod 1, have expansion slot 2-1 on the expansion sleeve 2, there is the end of expansion slot 2-1 can be under the effect of external force on the expansion sleeve 2 by distending, expanding nut 3 matches with the screw thread 1-2 of screw rod 1, the profile of expanding nut 3 is a frustoconic shape, or billiard table shape, the big end diameter of an end diameter is little, and the outer side surface of expanding nut 3 is provided with the 1-4 sheet and only revolves fin 4, when screwing screw rod 1, only revolving in the expansion slot 2-1 that fin 4 can be stuck in expansion sleeve 2 on the expanding nut 3 can not be rotated expanding nut 3 with the rotation of screw rod 1, helps screw rod 1 like this and screws, when screw rod 1 and expanding nut 3 screw, the small end of expanding nut 3 at first enters expansion sleeve 2, and along with the increase gradually of degree of screwing, the big end of expanding nut 3 is distending expansion sleeve 2 gradually.When the utility model uses, expansion sleeve 2 can be enclosed within on the screw rod 1, there is the screw thread 1-2 of the end of expansion slot 2-1 and screw rod 1 end that exists together to be called the inner end on the expansion sleeve 2, the screw thread 1-2 of expanding nut 3 and screw rod 1 works good, the inner end is filled in the wall hole, screw screw rod 1 in nut 1-1 place, expanding nut 3 can make expansion sleeve 2 distendings, thereby fastening the utility model, can unscrew out screw rod 1 and taking-up this moment, repeating the above-mentioned program that screws again after connecting with the fixing object of need can be fixed on object on the wall, after perhaps screw rod 1 and the object that needs to fix being connected, just the wall hole is filled in inner end of the present utility model, screw and object can be fixed on the wall by said procedure.Because nut 1-1 can make more flatly, when working good with the object that is fixed, nut 1-1 can not protrude in body surface, and is attractive in appearance on the one hand, can satisfy the technical requirements of some engineering on the other hand.

Claims (3)

1, a kind of metal tack setscrew, had the screw rod of screw thread by the nut the other end and be enclosed within the outer expansion sleeve of screw rod by an end and forms, the profile that it is characterized in that having on the described screw rod (1) end of screw thread (1-2) to be provided with cooperation with it is the expanding nut (3) of frustoconic shape.

2, setscrew according to claim 1, the profile that it is characterized in that described expanding nut (3) is a billiard table shape.

What 3, setscrew according to claim 1 and 2, the outer side surface that it is characterized in that expanding nut (3) were provided with the 1-4 sheet only revolves fin (4).

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