CN2145889Y

CN2145889Y - Rod-like plastic expanding plug

Info

Publication number: CN2145889Y
Application number: CN 92242651
Authority: CN
Inventors: 刘冠中
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-12-07
Filing date: 1992-12-07
Publication date: 1993-11-10
Anticipated expiration: 2002-12-07

Abstract

The utility model relates to a rod-like plastic expanding plug in extrusion molding. The outer surfaces of three rod bodies, which are symmetrical, are connected by an expanding band; the inner surface of every rod body is a circular arc surface, and a dovetail groove is composed of the inner lateral surfaces of two neighboring rod bodies, and the inner surface of the expanding band; the center of the outside surface of every rod body is provided with a convex positioning edge. The utility model which has the advantages of uniform stress, large expanding pressure, strong fastening force and simple process can be continuously extruded and can be conveniently used according to the length of a wood screw.

Description

Rod-like plastic expanding plug

The utility model relates to a kind of civil building articles for use, particularly relates to a kind of clavate plastic expansion plug.

Modern civil building nearly all are the walls that brick and cement are built, and all are that very inconvenient, ancient way is to beat a hole so will follow closely a nail at indoor installation electric switch or on wall, timber are hit into again and nail on nail again with fastening object in the hole.In recent years, adopted a kind of plastics taper distinguish expansion plug, structure is such, and top is a cylindrical body, in a cone shape hole is arranged, the bottom is that two lobes are formed.During use it is filled in the hole, be screwed into from cone shape hole, the outside spreading of two lobes is tightened up with wood screw.The shortcoming of this structure is that the wood screw head is thin top thick, and two lobes are the back discontinuity separately, and the bottom fastening force is little, is easy to generate skidding when tightening, and therefore fastening is not firm.And this structural manufacturing process complexity can only singlely be produced.

The purpose of this utility model is that design is a kind of stressed even, the simple clavate plastic expansion of the big technology of fastening force plug.

The utility model is achieved in that a kind of clavate plastic expansion plug of extruding and moulding, the outer surface that it is characterized in that three lobe barred bodies of symmetry is connected by zone of swelling, the internal surface of every lobe barred body is an arc surface, the inner side surface of the adjacent barred body of two lobes and the internal surface of zone of swelling constitute a dovetail groove, and there is the positioning edge of a protrusion centre of every lobe outer surface of rod.

Accompanying drawing has provided embodiment of the present utility model, and is described further in conjunction with the accompanying drawings.

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a vertical cut-away schematic view of the present utility model.

Fig. 3 is a use scheme of installation of the present utility model.

Symbolic representation among Fig. 1-3 is as follows: three lobe barred

bodies

1,2,3, positioning edge 4, garden cambered surface 5, fin 6, fin 7, zone of swelling 8, dovetail groove 9, wall 10, mounting hole 11, fixation 12, wood screw 13, the middle positioning edge 4 that a protrusion is arranged of every lobe barred

body

1,2,3 outer surfaces, the outer rim of positioning edge 4, on the concentric circle of same diameter that with the expansion plug center line is the center of circle, there are fin 6 and fin 7 in the both sides of positioning edge 4.The outer rim of fin 6 and fin 7 is on the concentric circle of the same diameter in the center of circle at the expansion plug center line, and this concentrically ringed diameter is 6 millimeters, 8 millimeters or 10 millimeters.The length of clavate plastic expansion plug is suitable with the length of wood screw.

The utility model is to use like this, at first on wall, beat mounting hole 11, aperture size is identical with fin 7 diameters with fin 6, then clavate plastic expansion plug is vertically knocked in mounting hole, because the slightly larger in diameter of positioning edge 4 is in fin 6,7 diameter, at this moment clavate plastic expansion plug can not rotate in mounting hole 11, wood screw 13 passes the mounting hole on the fixation 12, wood screw 13 screws in clavate plastic expansion plug, wood screw is radially extruded arc surface 5, make three lobe clavates 1,2,3 outwards expand, and make fin 6,7 tightly are pressed in the surface of mounting hole 11, and fixation 12 is fixed on the wall tightly.

The utility model has the advantages that to have overcome existing plastic expansion plug, discontinuity is skidded easily, the shortcoming that fastening force is little, and evenly the bulbs of pressure are big because the utility model is stressed, and fastening force is strong. And technology is simple, can extrude continuously, and is according to the length intercepting of using wood screw, very easy to use.

Claims

1, a kind of clavate plastic expansion plug of extruding and moulding, the outer surface that it is characterized in that symmetrical three lobe barred bodies 1,2,3 is connected by zone of swelling 8, the internal surface of every lobe barred body 1,2,3 is an arc surface 5, the inner side surface of the adjacent barred body of two lobes and the internal surface of zone of swelling 8 constitute a dovetail groove 9, and there is the positioning edge 4 of a protrusion centre of every lobe barred body 1,2,3 outer surfaces.

2, according to the described clavate plastic expansion of claim 1 plug, it is characterized in that the outer rim of the positioning edge 4 of every lobe barred body 1,2,3, be on the concentric circle of the same diameter in the center of circle with the expansion plug center line, there are fin 6 and fin 7 in the both sides of positioning edge 4.

3, according to claim 1,2 described clavate plastic expansion plugs, it is characterized in that the outer rim of fin 6 and fin 7 is being on the concentric circle of the same diameter in the center of circle with the expansion plug center line, this concentrically ringed diameter is 6 millimeters, 8 millimeters or 10 millimeters.