CN2256052Y

CN2256052Y - Anti-dismounting nut with nominal torque

Info

Publication number: CN2256052Y
Application number: CN 95239306
Authority: CN
Inventors: 李颖民
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-08
Filing date: 1995-03-08
Publication date: 1997-06-11
Anticipated expiration: 2005-03-08

Abstract

The utility model relates to an anti-dismounting nut with nominal torque, belonging to the technical field of fastening. The utility model utilizes a nut with a particular form structure to achieve the nominal torque and reliable anti-dismounting function. The utility model is made of consubstantial materials, wherein, an upper side is a hexagon head 1, a lower side is a frustum cone-shaped nut 2, and the middle part of the utility model is connected through an annular gap 3 in a consubstantial mode. The bottom of the gap is an annular dangerous section. The nut is screwed down by a wrench, the gap is broken, and thus the hexagon head is separated. The torque of the preliminary design can be obtained, and stealing and dismounting can be effectively prevented. When an erector needs to dismount the nut, so long as the both sides of the surface of the frustum cone-shaped nut are ground into mutually parallel plane surfaces, a general wrench can easily disassemble the assembly completely.

Description

The rated torque anti-disassembling nut

The utility model belongs to technical field of fastening.

Known to claimant and agent, being installed in open-air electric power facility, outdoor equipment etc. at present is plain nut owing to what use, is easy to be stolen by lawless person's dismounting.At this situation, the someone imagine the working portion of fastening piece internal and external screw thread directly be provided with prevent reverse rotation mechanism's----this be actually at the lock of making a kind of delicate structure complexity.This product promptly enables to create, and cost is also considerable, loses more than gain.The someone imagines again, at nut and the threaded position of screw rod, designs special ditch, groove, and the special drag washer of purchasing simultaneously in the process of using, is embedded in drag washer and just is considered in the groove pin.But this groove is ready made, and itself does not possess the adaptive capacity of freely locating, and is difficult to fastening just right the finishing synchronously of the embedding of drag washer is fixed and nut.Moreover the difficulty of processing of this groove is very big, and this method also is inconsiderable.

The purpose of this utility model is a kind of rated torque anti-disassembling nut of design.Use the general tool of pulling, in being wrenched this nut process, the hexagon head of nut comes off voluntarily, can reach specified screw-down torque.It had both had reliable fastening effect, can adapt to freely locating of various assemblies again.Can prevent to steal the cruelty dismounting of molecule, can allow the staff utilize the shape of frustrating cutter correction cone surface at leisure again, make it to adapt to the surface of contact of pulling tool, just can successfully unload and take off the utility model, thereby in good condition equipment be disassembled.

The utility model advantage is: want the screw-down torque that reaches specified, what used in the past is the special key that can show torsional moment, also needs the operator to be familiar with the parameter of the specified screw-down torque of the fastened goods of all size simultaneously, perhaps prepares a data, at any time for future reference, pretty troublesome.And the utility model is very simple, as long as hexagon head is twisted, can reach specified screw-down torque, need not detect.When the utility model and plain bolt are used, as long as bolt has enough length, not restricted by the thickness of assembly, can freely locate, fastening effect is fine.Can reach specified screw-down torque after the utility model is fastening, fastening force is better than the plain nut of same specification, and the truncated cone nut profile that stays is special, makes any spanner all can't dismantle.Weight hits it, and is also of no avail.If but setter wants dismounting, only need to frustrate into plane parallel to each other with frustrating the both sides of cutter with truncated cone nut conical surface, then common wrench just can disassemble it.Design of the present utility model is a kind of big breakthrough in fastening piece goods field.It has not only enlarged the product using scope, can develop the multiple product kind in view of the above, especially can develop various tooth form goods, the anti-dismounting of rated torque high strength goods, and special type needs other screw-down torque goods of arbitrary number of level or the like.

The utility model is design like this: the rated torque anti-disassembling nut is connected to form by hexagon head 1 and truncated cone nut 2 consubstantialities, the joint of hexagon head and truncated cone nut is a ring breach 3, and the bottom of this breach is the dangerouse cross-section of a ring; The hexagon head profile is the same with plain nut, and just inner chamber does not have screw thread, and there is screw thread truncated cone nut inside.

The contrast accompanying drawing is described in detail the utility model below.

Fig. 1 is the overall schematic of rated torque anti-disassembling nut.

1-1 hexagon head, 1-2 truncated cone nut, 1-3 breach

Fig. 2 is the partial sectional view of rated torque anti-disassembling nut

The 2-4 screw thread

When tightening the utility model with common wrench, after in case screwing force reaches the specified screw-down torque of this kind specification, because the ultimate load of the dangerouse cross-section of this kind material equals the specified screw-down torque of this kind specification, just can rupture in these breach 3 cross sections, hexagon head 1 promptly separates by the intact like that gold of anticipation with truncated cone nut 2.What play the role of fastening is truncated cone nut 2, and this kind profile is that any spanner all is difficult to set about, thereby prevents the cruelty dismounting of illegal molecule effectively, has protected equipment.

Claims

1. the rated torque anti-disassembling nut of being made up of hexagon head and truncated cone nut is characterized in that breach 3 consubstantialities by a ring connect between hexagon head 1 and the truncated cone nut 2, and the bottom of this breach is the dangerouse cross-section of a ring.

2. by the described rated torque anti-disassembling nut of claim 1, it is characterized in that not having screw thread in the hexagon head 1, in the truncated cone nut 2 screw thread is arranged.