CN2101794U - Nut looseness-proof and anti-theft device - Google Patents

Abstract

The utility model relates to a nut looseness-proof and anti-theft device which is fabricated by elastic metallic yarns and is a spiral wedge with a certain thread pitch. In the utility model the spiral length is larger than half cycle and is smaller than one cycle; an inner diameter is a little smaller than the bottom diameter of the spiral groove of a threaded rod; the outside of one end forms a wedge surface or a conical surface corresponding to the first buckle chamfering of the nut. The nut looseness-proof and anti-theft device can be screwed into the gap of the contact place between the nut and a first buckle spiral teeth matched with a threaded rod, which can effectively eliminate the radial clearance and can lock the nut to play the looseness-proof and anti-theft function. The utility model has the advantages of small size, light weight, low cost, no damage of the nut and convenient assembly by using special tools.

Description

Nut Looseness-proof and anti-theft device

The utility model relates to a kind of nut anti-looseness and anti-theft device, particularly a kind of nut locking radial device.

At present, be used for nut anti-looseness, antitheft device has numerous species.Axial clearance during double nut, spring washer etc. are eliminated screw rod and nut is cooperated by end-face friction can only play locking effect, and is not ideal to the occasion effect that installation requirement is high, and increase material and cost.Patent documentation is reported many nut anti-looseness, anti-theft device in recent years, be broadly divided into three classes by its structure characteristic, one class is to put into butterfly spring, nut tip portion at the internally tangent ring-shaped groove of nut to fix a special spring sheet and embed screw rod, or, carry out nut anti-looseness by the axial clearance that the elastic reaction behind the nut screwing clamping is eliminated between nut and screw rod in methods such as the periphery of plain nut and bottom surface undercut slots.One class is groove of deepening gradually along the screw thread tightening direction of processing on the internal thread of common standard nut, puts into a ball then or squeeze into a key pin at groove in groove, in order to pin nut.The 3rd class is to adopt special periphery to be the nut or the special-shaped nut structure of convex-shaped surface, or adopts the tenon structure all to pack screw rod into to reach the antitheft purpose of nut with special tool.More than the device great majority all will be changed a social system again to standard nut, have weakened the mechanical strength of nut, the locking device structure complexity of increase, and volume is big, the cost height, and generally can not have locking and antitheft function simultaneously concurrently.

The purpose of this utility model is to overcome the deficiencies in the prior art part, provide a kind of simple in structure, volume is little, in light weight, do not change a social system standard nut and can effectively prevent nut loosening and stolen device.The further purpose of the utility model is, for the utility model nut anti-looseness and anti-theft device design a kind of assembling, dismounting special tool.

Design philosophy of the present utility model is as follows: because all there is chamfering at standard nut internal thread two ends, forming the first button thread is non-complete thread, the crest height gradually changes from low to high, therefore when nut cooperates with screw rod, just form a spiral wedge shape (or taper) space in the first button thread contacting point, this space helix length is about half cycle between week, designs the spiral wedge that adapts of space therewith, it is entered and firmly occupy this space, can be from radially nut being locked.

Specifically, the utility model nut anti-looseness and antitheft device are the spiral wedges of being made by elastic metallic yarn, its pitch is identical with pitch on the screw rod, helix length is greater than half cycle and less than a week, internal diameter is slightly less than screw spiral bottom land footpath, and the end outside is and the nut first button corresponding wedge surface of chamfering or the conical surface.According to said structure as can be known, this spiral wedge has elasticity radially.During use, nut is cooperated with screw rod tightens earlier, then with in this spiral wedge (the wedge end is preceding) screw-in screw rod and the wedge gap that nut cooperates, till tightening.At this moment, the top of the non-complete thread of nut first button is pressed on the wedge surface of spiral wedge, because this spiral wedge leans on resilient grip in screw spiral trough, in case nut is because of being vibrated or the varying load desire is loosening when returning, the spiral wedge can not retreat thereupon, and therefore, the spiral wedge is when eliminating nut, screw rod radial clearance, also eliminate its axial clearance, reached the purpose of nut anti-looseness.Because almost all embed in the screw spiral trough during assembling of this spiral wedge, good concealment is difficult for realizing, has realized exactly, if want to back out nut with instruments such as common spanners, also be impossible at all, opposite, because the effect of wedge only can be moved back tighter and tighter, thereby be realized antitheft purpose.

When this spiral wedge is used for the nut anti-looseness of often dismounting, can make its afterbody have the crotch of deflection laterally, during use, its front end embeds in the screw spiral trough, and the afterbody crotch is exposed at outside the nut end face, is convenient to withstand crotch with instrument, its derotation is withdrawed from, thereby made the nut release.

The assembling of this spiral wedge, dismounting (dismounting is only limited to tail end buckle type) if use instruments such as having spanner now, are difficult to finish, and for this reason, the utility model designs a kind of special tool, for practical operation is provided convenience.This special tool is similar to existing spanner, it is made up of handle and working portion, handle has certain length, be used to increase moment, working portion is a circular cylinder, and inwall has and the corresponding to screw thread of screw rod, bottom surface has a boss, the boss inboard has the screw thread continuous with inner thread, also has a screw that connects upper and lower bottom surface on the circular cylinder, and a screwed flexible rod is arranged in this screw.This special tool utilize boss assembling spiral wedge (buckle or not buckle all can), utilize the spiral wedge of flexible rod dismounting afterbody buckle.

With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in detail.

Fig. 1 is nut first button spiral wedge gap schematic representation when cooperating with screw rod.

Fig. 2 is the utility model nut anti-looseness and anti-theft device spiral wedge plan view.

Fig. 3 is that the A of Fig. 2 is to schematic representation.

Fig. 4 is the expansion schematic representation of Fig. 2.

Fig. 5 is the utility model afterbody buckle spiral wedge schematic representation.

Fig. 6 is the assembling of the utility model spiral wedge, dismounting special tool worm's eye view.

Fig. 7 is the B-B schematic representation of Fig. 6.

As shown in Figure 1, when nut 1 cooperates with screw rod 2, there is a spiral wedge shape (or taper) space 3 in the first button thread contacting point.

As Fig. 2, Fig. 3, shown in Figure 4, the utility model spiral wedge is made by elastic metallic yarn, and helix length is greater than half cycle and less than a week, and pitch is identical with pitch on the screw rod, internal diameter is slightly less than footpath at the bottom of the screw channel, and the end outside is for having the wedge surface or the conical surface 4 of several angle.

As shown in Figure 5, spiral wedge afterbody has the crotch 5 of deflection laterally, belongs to detachable type.

As shown in Figure 6 and Figure 7, the assembling of the utility model spiral wedge, dismounting special tool are made up of handle 6 and circular cylinder working portion 8, inboard wall of cylinder has and the corresponding to screw thread 9 of screw flight, at the cylinder bottom surface one boss 7 is arranged, the boss inboard has and the consecutive screw thread 12 of inner thread, also have 10, one the screwed flexible rods 11 of screw that connect upper and lower bottom surface to be arranged in this screw on the cylinder.When assembling is used, earlier with nut screwing clamping on screw rod, with hand supporting spiral wedge is put into screw channel then, again this special tool is screwed in screw rod, boss with its bottom surface withstands spiral wedge tail end, continues rotation and locatees in the spiral wedge gap that this spiral wedge screw-in nut is cooperated with screw rod.When dismounting afterbody buckle spiral wedge, earlier this special tool is screwed in screw rod, when its lower end surface during apart from pitch of nut end face, with hand flexible rod is threaded to downwards with nut end face and contacts, prop up spiral wedge afterbody crotch, impose moment, the derotation of spiral wedge is withdrawed from unloaded.

In the example, the spiral wedge is manufactured with Stainless Steel Wire, can be made into plurality of specifications, to be applicable to various nuts, be used for the M48 nut anti-looseness and when antitheft, about 1.2 millimeters of spiral wedge diameter, wedge surface is about half cycle, weight is 6 grams only, are significantly less than 114 grams of same specification spring washer and 958 grams of hexagonal locking nut.

The utility model is easy to manufacture, and consumptive material is few, and cost is very low.Can form standardization, tandem product, can be from one or both ends locking nut and analog thereof, applied widely, can both play locking and antitheft effect to various screw threads, can not damage nut in the use, spiral wedge device proper also can repeatedly use as damaging.

Claims (3)

1, is used for the internal thread first button thread and has the nut anti-looseness of chamfering and antitheft device, it is characterized in that the spiral wedge made by elastic metallic yarn, its pitch is identical with pitch on the screw rod, helix length is greater than half cycle and less than a week, internal diameter is slightly less than screw spiral bottom land footpath, and the end outside is and the nut first button corresponding wedge surface of chamfering or the conical surface.

2, nut anti-looseness according to claim 1 and antitheft device is characterized in that spiral wedge afterbody has the crotch of deflection laterally.

3, nut anti-looseness according to claim 1 and 2 and antitheft device, it is characterized in that having assembling, dismounting special tool, form by handle and circular cylinder working portion, the circular cylinder inwall has and the corresponding to screw thread of screw rod, bottom surface has a boss, the boss inboard has the screw thread continuous with inner thread, also has a screw that connects upper and lower bottom surface on the circular cylinder, and a screwed flexible rod is arranged in this screw.

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