CN201250831Y

CN201250831Y - Expansion screw

Info

Publication number: CN201250831Y
Application number: CNU200820026376XU
Authority: CN
Inventors: 颜丙平
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-27
Filing date: 2008-07-27
Publication date: 2009-06-03
Anticipated expiration: 2018-07-27

Abstract

The utility model relates to an expansion screw which comprises a screw cap, a stud, a taper screw nut and an expansion pipe, and the latter part of the expansion pipe is provided with a plurality of axial gaps. The utility model is characterized in that the screw cap and the stud of the expansion screw are integrated into a whole; screw threads are arranged on the stud; the tail end of the stud is provided with an anti-retreating device; the expansion pipe is sleeved on the stud; a big gasket is clamped between the screw cap and the expansion pipe; the rear of the expansion pipe is provided with the taper screw nut matched with the stud; the small taper end of the taper screw nut is movably embedded in a tail end inner cavity of the expansion pipe; the outer wall of the taper screw nut is provided with axial protruding ribs; the screw threads on the inner wall are matched with the outside screw threads of the stud; the rear of the taper screw nut is provided with a small gasket the diameter of which is no more than the outside diameter of the taper screw nut; the rear of the small gasket is provided with the anti-retreating device; and the screw cap is in a six prism shape, and the top part of the six prism is provided with a protruded cross-shaped groove. The utility model has the advantages of increased mightiness, anti-theft and optional capability.

Description

A kind of setscrew

Technical field

The utility model relates to the fixing setscrew of a kind of body of wall, a kind of setscrew that especially can be antitheft.

Background technique

At present, used setscrew is to be made of expander and T type screw rod usually, by the rotation of the nut on the T type screw rod expander is expanded, reach fixation, because screw rod and nut flexibly connect, therefore, when fixing some door and windows, need only nut laid down and just be easy to door and window is stolen.

Summary of the invention

The utility model purpose is to overcome the defective that existing setscrew can not be antitheft, provide can be antitheft a kind of setscrew.

The utility model is realized in the following way: a kind of setscrew, comprise nut, the spiral shell rod, tapered cup nut, expansion tube, the latter half part of expansion tube has many axial slits, it is characterized in that the nut of setscrew and spiral shell rod be one and the spiral shell rod on screw thread is arranged, the end of spiral shell rod has anti-unloading device; Expansion tube is enclosed within on the spiral shell rod, accompany a big pad between nut and the expansion tube, have one and the tapered cup nut that is complementary of spiral shell rod behind the expansion tube, the conelet end activity of tapered cup nut is nested in the terminal inner chamber of expansion tube, axial protruding rib is arranged on the outer wall of tapered cup nut, and the outside thread of screw thread on the inwall and spiral shell rod is complementary.

Described expansion tube outside is a cylindrical shape, and latter half part has four axial slits that the interval is identical, and the expansion tube interior extremity is an inner conical.

Described nut is six prismatics, and the top of nut has the screw edge of a knife.

The rear of described tapered cup nut has a diameter to be not more than the minipad of tapered cup nut maximum outside diameter, and there is anti-unloading device at the rear of minipad; Described anti-back apparatus structure is: have a pin-and-hole on the end of spiral shell rod, be inserted with pin in the pin-and-hole.

A kind of setscrew, the big pad of setscrew is greater than the external diameter of expansion tube, and minipad is no more than the external diameter of expansion tube, and pin inserts behind the pin-and-hole of spiral shell rod afterbody its bending less than the outer warp of expansion tube.During use setscrew is placed in the hole of accomplishing fluently, clockwise rotate nut with spanner or cross cutter, the spiral shell rod utilizes tailing screw flight pulling tapered cup nut that expansion tube is opened, and reaches the effect of fixed object, if, the opposite spin nut is under the effect of screw thread, and tapered cup nut moves to the rear portion of spiral shell rod, when running into stopping of minipad and pin tapered cup nut is expanded more, therefore, resistance when setscrew withdraws from increases, and screw is not easy to be withdrawed from, thereby reaches antitheft purpose; Get final product when not needing when antitheft pin in the pin-and-hole and minipad to be removed; Therefore, this screw has alternative.

The beneficial effects of the utility model are: have powerful increase, antitheft and selectable advantage.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described further.

Fig. 1 is the utility model structural representation.

Fig. 2 is nut of the present utility model and spiral shell rod structural representation.

Fig. 3 is an expansion tube structural representation of the present utility model.

Fig. 4 is an expansion tube part sectioned view of the present utility model

Fig. 5 is a tapered cup nut structural representation of the present utility model

Fig. 6 is a nut top structure schematic representation of the present utility model

Among the figure, 1. nut, 2. big pad, 3. expansion tube 4. protruding ribs, 5. tapered cup nut, 6. minipad, 7. pin, 8. pin-and-hole, 9. spiral shell rod, 10. expansion tube slit.

Specific embodiment

As shown in Figure 1, a kind of setscrew comprises nut 1, spiral shell rod 9, tapered cup nut 5, expansion tube 3, the latter half part of expansion tube 3 has many axial slits 10, the nut 1 of setscrew and spiral shell rod 9 be one and the spiral shell rod on screw thread is arranged, the end of spiral shell rod 9 has anti-unloading device; Expansion tube 3 is enclosed within on the spiral shell rod 9, accompany a big pad 2 between nut 1 and the expansion tube 3, have one and the tapered cup nut 5 that is complementary of spiral shell rod 9 behind the expansion tube 3, the conelet end activity of tapered cup nut 5 is nested in the terminal inner chamber of expansion tube 3, axial protruding rib 4 is arranged on the outer wall of tapered cup nut 5, and the outside thread of screw thread on the inwall and spiral shell rod 9 is complementary.

When assembling, earlier big pad 2 is inserted on the spiral shell rod 9, again expansion tube 3 is inserted in, the end that slit 10 is arranged is towards the end that pin-and-hole 8 is arranged, and the littler end of tapered cup nut 5 screwed in expansion tube 3 towards an end of nut 1, and corresponding with the slit 10 of expansion tube 3 the protruding rib 4 of tapered cup nut 5, protruding rib 4 is embedded in the slit of expansion tube 3, minipad 6 is inserted in, again pin 7 is passed from pin-and-hole 8 and, make to bend the external diameter of pin external diameter less than expansion tube 3 with pin 7 bendings.

During use, setscrew is bumped in the hole of accomplishing fluently in advance, clockwise rotate nut 1 with spanner or cross cutter, nut 1 drives spiral shell rod 9 and rotates together, spiral shell rod 9 utilizes latter half of screw thread pulling tapered cup nut 5 to move to nut 1 one ends, and then expansion tube 3 is strutted the purpose that reaches installation by tapered cup nut 5, because the inner conical structure of expansion tube 3, therefore, its expansion strength strong a lot of than original tubular structure.Otherwise, if want screw is taken out, be rotated counterclockwise nut 1 under the effect of screw thread, tapered cup nut 5 moves to the rear portion of spiral shell rod 9, when running into stopping of minipad 6 and pin 7 tapered cup nut 5 is expanded more, resistance when then setscrew withdraws from increases screw and is not easy to be withdrawed from, thereby reaches antitheft purpose; Get final product when not needing when antitheft pin in the pin-and-hole 87 and minipad 6 to be removed.

Claims

1. a setscrew comprises nut, the spiral shell rod, tapered cup nut, expansion tube, the latter half part of expansion tube have many axial slits, it is characterized in that the nut of setscrew and spiral shell rod be one and the spiral shell rod on screw thread is arranged, the end of spiral shell rod has anti-unloading device; Expansion tube is enclosed within on the spiral shell rod, accompany a big pad between nut and the expansion tube, have one and the tapered cup nut that is complementary of spiral shell rod behind the expansion tube, the conelet end activity of tapered cup nut is nested in the terminal inner chamber of expansion tube, axial protruding rib is arranged on the outer wall of tapered cup nut, and the outside thread of screw thread on the inwall and spiral shell rod is complementary.

2. a kind of setscrew as claimed in claim 1 is characterized in that described expansion tube outside is cylindrical shape, and latter half part has four axial slits that the interval is identical, and the expansion tube interior extremity is an inner conical.

3. a kind of setscrew as claimed in claim 1 is characterized in that described nut is six prismatics, and the top of nut has the screw edge of a knife.

4. a kind of setscrew as claimed in claim 1 is characterized in that the rear of described tapered cup nut has a diameter to be not more than the minipad of tapered cup nut maximum outside diameter, and there is anti-unloading device at the rear of minipad; Described anti-back apparatus structure is: have a pin-and-hole on the end of spiral shell rod, be inserted with pin in the pin-and-hole.