CN201265589Y - Anti-dismantling screw - Google Patents

Abstract

The utility model relates to an anti-disassembly screw which comprises an iron inner screw, an engineering plastic outer screw and a screwhead, wherein the iron inner screw is molded into the engineering plastic outer screw, the inner screw and the outer screw are integrated, the screwhead is connected with the iron inner screw, the shape of the iron inner screw is the same with that of a common screw, the contact position of the iron inner screw and the screwhead is provided with a transverse anti-loosing groove, a plurality of longitudinal cutting grooves are arranged on the threads of the iron inner screw, 3 to 6 longitudinal cutting grooves can be respectively arranged according to the size of the diameter of the iron inner screw, and the width of each longitudinal cutting groove and the number of the longitudinal cutting grooves are calculated according to torsions of different screws of China to ensure the locking force of screws with different specifications.

Description

Tamper proof screws

Technical field

The utility model relates to a kind of screw, relates in particular to a kind of screw of dismantling prevented.

Background technique

Along with the develop rapidly and the utilization of modern science and technology, high-end sci-tech product enters ordinary hundred property men one after another.When some the interested crowd of science and technology is wanted to untie the secret of high-end science and technology, it is inevitable will having a mind to or dismantle high-end sci-tech product unintentionally voluntarily.Because the installation specification of high-end sci-tech product is generally very high, blindly imitate with dismantling arbitrarily and tend to influence its function, precision, even the incident of the high-end sci-tech product that can be damaged.Dispute between Consumer and the production firm will often appear based on above phenomenon.Complaints are heard everywhere not understand the user of plot, scolds that product quality is bad, producer but think the client removing damaged arbitrarily product.For preventing the generation of above similar incidents, we have invented a kind of tamper proof screws.It is used in producer thinks behind the non-detachable position, the hobby persons just can't dismantle outside screw is exposed to the core position of product and key position with general utility tool, thereby have protected the usability and the selectivity of high-end sci-tech product.

The model utility content

The purpose of this utility model is to provide a kind of anti-dismounting screw; it is used in producer thinks behind the non-detachable position; the hobby persons just can't dismantle outside screw is exposed to the core position of product and key position with general utility tool, thereby have protected the usability and the selectivity of high-end sci-tech product.

For achieving the above object, the utility model provides a kind of anti-dismounting screw, and it comprises: an irony internal thread, an engineering plastics outside nut, a screw terminal.

It is injection-moulded in the irony internal thread in the engineering plastics outside nut, and two are integrated.This screw terminal is connected with this irony internal thread.The profile of this irony internal thread is identical with common similar screw, just is provided with horizontal anticreep groove at this irony internal thread and the contacted position of this screw terminal, and the screw thread of this irony internal thread is provided with some cut grooves longitudinally.This longitudinally the cut groove big I of looking irony internal thread diameter offer the 3-6 bar respectively, the width of this every longitudinal shear groove calculates about the due torsion of different screws through country with quantity, has guaranteed the locking strength of different size screw.

Description of drawings

Fig. 1 is the profile status structural drawing of a kind of tamper proof screws of the utility model.

Fig. 2 is the flat state structural drawing of the screw terminal of a kind of tamper proof screws of the utility model.

Fig. 3 is the sectional view along Figure 1A-A direction of a kind of tamper proof screws of the utility model.

Embodiment

See also Fig. 1 to Fig. 3, a kind of anti-dismounting screw, it comprises: an irony internal thread 1, an engineering plastics outside nut 2, a screw terminal 3.

It is injection-moulded in the engineering plastics outside nut 2, two with irony internal thread 1 and is integrated.This screw terminal 3 is connected with this irony internal thread 1.The profile of this irony internal thread 1 is identical with common similar screw, just is provided with horizontal anticreep groove 11 at this irony internal thread 1 with these screw terminal 3 contacted positions, and the screw thread of this irony internal thread 1 is provided with some cut grooves longitudinally 12.This longitudinally the cut groove 12 big I of looking irony internal thread 1 diameter offer the 3-6 bar respectively, the width of this every longitudinal shear groove 12 calculates about the due torsion of different screws through country with quantity, has guaranteed the locking strength of different size screw.

Also can be when this tamper proof screws uses on the general position with fastening between the two, if only need go into overdrive when using on the position of tamper, screw is screwed to skid both can.

During use general utility tool being aimed at screw terminal 3 exerts all one's effort downwards to rotate to get final product, owing in rotation, clamp-on engineering plastics generation shearing force cut groove 12 on to engineering plastics outside nut 2 at the longitudinal shear groove 12 on the irony internal thread 1, when shearing force during less than the anti-shearing force of engineering plastics, irony internal thread 1 is by clamp-oning the engineering plastics in the longitudinal shear groove 12, drive 2 rotations of engineering plastics outside nut, workpiece is tightened.When shearing force during greater than the anti-shearing force of engineering plastics, the engineering plastics of clamp-oning in the longitudinal shear groove on the irony internal thread 1 12 will be sheared, make irony internal thread 1 in engineering plastics outside nut 2, the concentric rotation that suspends in mid air, thus reached the purpose that prevents the general tool dismounting.

Remarks: be used for dismantling this tamper proof screws and need use special tool(s), do not set forth in this patent the inside.

Claims (1)

1, a kind of anti-dismounting screw, it comprises: an irony internal thread (1), an engineering plastics outside nut (2), a screw terminal (3) is characterized in that: it is injection-moulded in irony internal thread (1) in the engineering plastics outside nut (2); Be provided with horizontal anticreep groove (11) at this irony internal thread (1) and the contacted position of this screw terminal (3), the screw thread of this irony internal thread (1) is provided with some cut grooves longitudinally (12).

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