CN2217705Y

CN2217705Y - Screw expansion-nail

Info

Publication number: CN2217705Y
Application number: CN 95202917
Authority: CN
Inventors: 苗世明
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-02-21
Filing date: 1995-02-21
Publication date: 1996-01-17
Anticipated expiration: 2005-02-21

Abstract

The utility model relates to an expansion screw nail for a flexible wall body, comprising a screw nail and a screw expansion body. The screw nail is a wood screw or a machine screw. The screw expansion body is a conic cylinder whose surface is provided with a convex screw on which 1-4 grooves which are parallel with the bus-bar of a conic surface are arranged, and each screw forms 1-4 cutting edges which are similar to a screw tap. The root of the cutting edge is provided with a bar-shaped mud hole which is communicated with a central hole which penetrates through the screw expansion body, and the end surface of the big end of the screw expansion body is provided with a noncircular screw driver groove. When the flexible wall is drilled, the expansion body is rotated into the wall. When the big end is parallelled with a wall surface, a fixed object is fixed on the screw expansion body through the screw nail. The utility model has convenient use and good fixing effect, and the utility model can bear the function of static force and alternating force.

Description

Screw expansion-nail

The utility model relates to fastening piece, relates in particular to the swell fixture that is used for body of wall.

As everyone knows, at present the commercially available swell fixture that is used for body of wall has two kinds: a kind of expansion sleeve that horizontal fin vertically is provided with gap forms by having on screw and the wall, it is that screw-in expansion sleeve center hole by nail expands outwardly expansion sleeve, makes the expansion sleeve wall press borehole wall on the wall and realizes fixing purpose.Another kind of then be to be that the core body of taper, inner chamber can hold the outer wall of expanding core and be provided with horizontal fin and have the expansion sleeve of vertical gap, an eyelet and a nut and constitute for the double-screw bolt rear end by front end; It is by turning nut, make the taper reach that is inserted in the expansion sleeve, forced expansion sleeve to expand outwardly slightly and made jacket wall be pressed on borehole wall by core body, realizes fastening purpose.Above-mentioned two kinds of swell fixtures have easy to usely really, and the advantage that fixed effect is good is so obtain extensive use.

But we should see: above-mentioned two kinds of swell fixtures are only applicable to the harder body of wall of material, and its fixed effect then is highly undesirable on soft body of wall.So in many tall buildings that are made of coagulation big frame and light block wall, for building components such as fixed gate, window, radiator, washbasins etc., the pre-buried clay piled bricks of having to is with existing swell fixture standing finish.In the place that does not have piled bricks, can only iron splint be set on the body of wall two sides and fix with through-wall bolt, this method not only taken a lot of work, but also waste material, also increased wall quality and made troubles for construction such as plastering of later stage.

The purpose of the utility model is: design a kind of Screw expansion-nail that is specifically designed to soft body of wall, make building components can be under the condition that does not have pre-buried clay piled bricks easily, be fixedly mounted in any position of soft body of wall.

The utility model is to realize above-mentioned purpose like this:

Screw expansion-nail of the present utility model (referring to Fig. 1,2,3) is made of screw (1) and bloated body (2) two-part of spiral.Described screw (1) is wood screw, machine screw or tapping screw; The described spiral body (2) that expands, its external form is a conical cylinder, this cone outer wall has the screw thread (3) of projection, on screw thread (3), be provided with one or 2-4 grooves parallel being symmetrically distributed with cone generatrices, make on each all screw thread of this screw thread and constitute 1-4 cutting edges similar (4) to " screw tap ", have the bar shaped mud hole (5) that parallels with cone element on the conical surface of each cutting edge root, this deslagging bar hole (5) communicates with the center hole (O) that runs through the end, cone top; Described center hole (O) is straight circular hole or cone shape hole, and the inwall in hole is smooth or has vertically straight muscle or female thread; The bigger diameter end end face central part of cone-shape has darker cross or non-circular screw blade groove (5).Be the cutting effect of reinforcement screw thread cutting edge, described 1-4 grooves parallel with bus, an one bottom surface and cone are tangent, and another face then becomes 90 ° ± 10 ° is advisable with the conical surface, and promptly the angle of cut α of two of groove faces is the best with 90 ° ± 10 °.Described bar shaped mud hole is continuous or discontinuous.

Described center hole (O), its aperture approximate screw (1) minor diameter part diameter and are advisable.

Description of drawings:

The structure of Fig. 1-Screw expansion-nail and use schematic representation, wherein:

1-screw, the 2-spiral body that expands, 3-convex thread, 4-sword face, 5-mud hole, 6-screw blade groove, 7-soft wall body of wall, the perforate of 8-body of wall, 9-material installed.

A among Fig. 2-Fig. 1-A sectional drawing, wherein:

O-expansion cone center hole, 6-screw-driver cutter groove.

B among Fig. 3-Fig. 1-B sectional drawing, wherein:

4-sword face, 5-mud hole.

Embodiment and effect:

I use metal and rigid plastics respectively, have made the bloated body of screw of several different sizes by above-mentioned design proposal.Making a call to an aperture on soft body of wall is equal to or slightly greater than bigger slightly than cone front end, the hole of the bloated body length big 1/3 of hole depth rate, turn bloated body (2) with screw-driver, by the cutting of the edge of a knife on the screw thread that protrudes porthole wall, and slag bits are entered center hole (O) and porthole front end by deslagging bar hole (5), make bloated body (2) be screwed into and make expand body and the close kiss of body of wall hole wall smoothly, the big end end of body of waiting to expand stops to turn when equal with soft metope, then will be by the punching of dress thing, the center hole (O) that screw (1) is screwed into the bloated body (2) of spiral also is fixed on material installed on the body of wall by screw (1).Because screw is screwed into, spiral expands body to expansion all around, makes being rotatably assorted between bloated body of spiral and the porthole become drive fit.This Screw expansion-nail has suitable mechanical resistance and rotation friction, so the effect of ability static(al) and alternating force is all had good fixation to fixed static weight and shake or the door and window that rotates etc., has realized the intended purposes of inventing fully.

Test shows: the screw thread on the bloated body of spiral, under the situation higher at thread depth, that pitch is bigger, Screw expansion-nail has load effect preferably.

Claims

1, a kind of Screw expansion-nail that is used for soft body of wall is characterized in that: it is made of screw (1) and bloated body (2) two-part of spiral.Described screw (1) is wood screw, machine screw or tapping screw; The described spiral body (2) that expands, its external form is a conical cylinder, this cone outer wall has the screw thread (3) of projection, on screw thread (3), be provided with one or 2-4 grooves parallel being symmetrically distributed with cone generatrices, make on each all spiral shell mosquito of this spiral shell mosquito and constitute 1-4 cutting edges similar (4) to " screw tap ", have the bar shaped mud hole (5) that parallels with cone element on the conical surface of each cutting edge root, this deslagging bar hole (5) communicates with the center hole (O) that runs through the end, cone top; Described center hole (O) is straight circular hole or cone shape hole, and the inwall in hole is smooth or has vertically straight muscle or female thread; The bigger diameter end end face central part of cone-shape has darker cross or non-circular screw blade groove (6).

2, Screw expansion-nail according to claim 1, it is characterized in that: described 1-4 grooves parallel with bus, an one bottom surface and cone are tangent, and another face then becomes 90 ° ± 10 ° is advisable with the conical surface, and promptly the angle of cut α of two of groove faces is the best with 90 ° ± 10 °.

3, Screw expansion-nail according to claim 1 and 2, English is characterised in that: described bar shaped mud hole is continuous or discontinuous.