EXPANSION ANCHOR BOLTS
Technical field
The utility model relates to a kind of EXPANSION ANCHOR BOLTS.
Background technique
Present EXPANSION ANCHOR BOLTS, as Chinese patent application number: 200610038227.0 (strong expansion bolts) etc., all be to adopt the nut that is rotated on the screw rod, screw rod is relative to move up (outwards moving), nut moves on screw rod and compresses tapered cap, make the tapered cap that is fixed on the screw rod press to expansion tube, it is fixing to realize expanding.Because screw rod moves up (with respect to expansion tube) relatively, after EXPANSION ANCHOR BOLTS was fixing, it is longer outward that screw rod exposes fixed body, becomes a kind of obstacle, also influences attractive in appearance.
Summary of the invention
The purpose of this utility model is to provide a kind of EXPANSION ANCHOR BOLTS, and after this EXPANSION ANCHOR BOLTS was used, screw rod exposes few, and was attractive in appearance.
To achieve these goals, the technical solution of the utility model is: EXPANSION ANCHOR BOLTS, and it comprises screw rod, expansion tube, and the underpart of expansion tube has the opening slot of five equilibrium, and screw rod is provided with outside thread, and expansion tube is passed in the underpart of screw rod; It is characterized in that: the upper end of screw rod is welded with nut, and nut is positioned at the top of expansion tube; The underpart of screw rod is rotary with the inferior pyramidal nut, the inferior pyramidal nut is positioned at the below of expansion tube, the little head end of inferior pyramidal nut up, the external diameter of the little head end of inferior pyramidal nut is less than or equal to the internal diameter of expansion tube, the external diameter of the stub end of inferior pyramidal nut is greater than the internal diameter of expansion tube.
Outside thread on the described screw rod is made up of upper external thread, lower external thread two-part, and lower external thread and upper external thread on the screw rod are reverse, and the top of screw rod is rotary with upper conical nut, and upper conical nut is positioned at the top of expansion tube; The upper end portion of expansion tube has the opening slot of five equilibrium; The little head end of upper conical nut down, the external diameter of the little head end of upper conical nut is less than or equal to the internal diameter of expansion tube, the external diameter of the stub end of upper conical nut is greater than the internal diameter of expansion tube.
Be with packing ring on the screw rod, packing ring is positioned at the top of expansion tube.
Be with the epicone body on the described screw rod, the epicone body is provided with screw vent, and screw rod passes the screw vent of epicone body, and upper conical body is positioned at the top of expansion tube; The upper end portion of expansion tube has the opening slot of five equilibrium; The little head end of epicone body down, the external diameter of the little head end of epicone body is less than or equal to the internal diameter of expansion tube, the external diameter of the stub end of epicone body is greater than the internal diameter of expansion tube.
The bottom of described nut is a taper, and the upper end portion of expansion tube has the opening slot of five equilibrium; The little head end of the taper of nut down, the external diameter of the little head end of the taper of nut is less than or equal to the internal diameter of expansion tube, the external diameter of the stub end of the taper of nut is greater than the internal diameter of expansion tube.
The beneficial effects of the utility model are: adopt said structure, use the wrench rotary nut, screw rod moves down, and the inferior pyramidal nut moves up, and the inferior pyramidal nut inserts in the expansion tube, and it is fixing to realize expanding; Because screw rod moves down, screw rod exposes few, and is attractive in appearance.Adopt two tapered cup nuts to move to expansion tube simultaneously and insert in the expansion tube, fixed speed is fast, fastness is high, stress effect is good.
Description of drawings
Fig. 1 is the utility model embodiment 1 a structural representation;
Fig. 2 is the utility model embodiment 2 a structural representation;
Fig. 3 is the utility model embodiment 3 a structural representation;
Fig. 4 is the utility model embodiment 4 a structural representation;
Among the figure: 1-screw rod, 2-inferior pyramidal nut, 3-expansion tube, 4-opening slot, the upper conical nut of 5-, 6-packing ring, 7-nut, 8-epicone body.
Embodiment
Embodiment 1:
As shown in Figure 1, EXPANSION ANCHOR BOLTS, it comprises screw rod 1, inferior pyramidal nut 2, expansion tube 3, packing ring 6, nut 7, and the underpart of expansion tube 3 has the opening slot 4 of five equilibrium, and screw rod 1 is provided with outside thread, and expansion tube 3 is passed in the underpart of screw rod 1; The upper end of screw rod 1 is welded with nut 7 (nut 7 also can be structure as a whole with screw rod 1), and nut 7 is positioned at the top of expansion tube 3; Be with packing ring 6 on the screw rod 1, packing ring 6 is positioned at the top of expansion tube 3; The underpart of screw rod 1 is rotary with inferior pyramidal nut 2, inferior pyramidal nut 2 is positioned at the below of expansion tube 3, the little head end of inferior pyramidal nut 2 up, the external diameter of the little head end of inferior pyramidal nut 2 is less than or equal to the internal diameter of expansion tube 3, the external diameter of the stub end of inferior pyramidal nut 2 is greater than the internal diameter of expansion tube 3.The upper end of screw rod 1 has the screw edge of a knife, also can pass through screw edge of a knife rotary screw 1.
Embodiment 2:
As shown in Figure 2, EXPANSION ANCHOR BOLTS, it comprises screw rod 1, inferior pyramidal nut 2, expansion tube 3, upper conical nut 5, packing ring 6, nut 7; The two end part of expansion tube 3 all have the opening slot 4 of five equilibrium; Top, the bottom of screw rod 1 are respectively equipped with outside thread, and the lower external thread and the upper external thread of screw rod 1 are reverse; Be with packing ring 6 on the screw rod 1, packing ring 6 is positioned at the top of expansion tube 3; The top of screw rod 1 is rotary with upper conical nut 5, upper conical nut 5 is (upper conical nut 5 is positioned at the top of expansion tube 3) between packing ring 6 and expansion tube 3, the upper end of screw rod 1 is welded with nut 7 (nut 7 also can be structure as a whole with screw rod 1), and nut 7 is positioned at the top of expansion tube 3; The little head end of upper conical nut 5 down, the external diameter of the little head end of upper conical nut 5 is less than or equal to the internal diameter of expansion tube 3, the external diameter of the stub end of upper conical nut 5 is greater than the internal diameter of expansion tube 3; Expansion tube 3 is passed in the underpart of screw rod 1, the underpart of screw rod 1 is rotary with inferior pyramidal nut 2, inferior pyramidal nut 2 is positioned at the below of expansion tube 3, the little head end of inferior pyramidal nut 2 up, the external diameter of the little head end of inferior pyramidal nut 2 is less than or equal to the internal diameter of expansion tube 3, and the external diameter of the stub end of inferior pyramidal nut 2 is greater than the internal diameter of expansion tube 3.
Embodiment 3:
As shown in Figure 3, substantially the same manner as Example 1, difference is: be with epicone body 8 on the described screw rod 1, epicone body 8 is provided with screw vent, and screw rod 1 passes the screw vent of epicone body 8, and epicone body 8 is positioned at the top of expansion tube 3; The upper end portion of expansion tube 3 has the opening slot of five equilibrium; The little head end of epicone body 8 down, the external diameter of the little head end of epicone body 8 is less than or equal to the internal diameter of expansion tube 3, the external diameter of the stub end of epicone body 8 is greater than the internal diameter of expansion tube 3.During rotation, nut 7 is pressed into epicone body 8 in the expansion tube 3.
Embodiment 4:
As shown in Figure 4, EXPANSION ANCHOR BOLTS, it comprises screw rod 1, inferior pyramidal nut 2, expansion tube 3, nut 7, and the two end part of expansion tube 3 all have the opening slot 4 of five equilibrium, and screw rod 1 is provided with outside thread, and expansion tube 3 is passed in the underpart of screw rod 1; The upper end of screw rod 1 is welded with nut 7 (nut 7 also can be structure as a whole with screw rod 1), and nut 7 is positioned at the top of expansion tube 3; The underpart of screw rod 1 is rotary with inferior pyramidal nut 2, inferior pyramidal nut 2 is positioned at the below of expansion tube 3, the little head end of inferior pyramidal nut 2 up, the external diameter of the little head end of inferior pyramidal nut 2 is less than or equal to the internal diameter of expansion tube 3, the external diameter of the stub end of inferior pyramidal nut 2 is greater than the internal diameter of expansion tube 3; The bottom of described nut 7 is a taper; The little head end of the taper of nut 7 down, the external diameter of the little head end of the taper of nut 7 is less than or equal to the internal diameter of expansion tube 3, the external diameter of the stub end of the taper of nut 7 is greater than the internal diameter of expansion tube 3.