Wedge barrier

Abstract

FIELD: wedge barriers.SUBSTANCE: devices that impede the progress of wheeled vehicles by forcibly stopping them. The wedge barrier includes a support base, a lifting platform, a manual control lever with steel plates that clamp the drive shaft. The manual control lever is attached to the outer end of the drive shaft by means of at least two steel plates that clamp it and have pointed protrusions. The angles at the tops of the pointed protrusions are 30–60 degrees, and the hardness of the steel from which the plates are made is 50–60 HRC.EFFECT: ensuring reliable fastening of the manual control lever on the drive shaft for controlling the wedge barrier in manual mode.5 cl, 2 dwg

Description

[0001] The invention relates to devices that impede the movement of wheeled vehicles by means of a forced stop, in particular to road blockers - anti-ram devices designed to prevent unauthorized entry of vehicles, in particular at checkpoints of restricted facilities.

[0002] An anti-ram road blocker RU 119754 U1 (published August 27, 2012) is known for preventing the movement of vehicles by forcibly stopping them. It comprises a support base and a blocking element pivotally connected to the support base. The blocker also includes a linear electric actuator whose rod is directly connected to the blocking element. Said linear electric actuator is capable of activating the blocking element and returning it to its operating position.

[0003] This invention has a significant drawback, since it does not have a manual control lever that allows the blocking element to be set in motion by manual control, including in the absence of power supply to the road blocker.

[0004] A road blocker RU 2499974 C1 (published 27.11.2013) is known, which is an anti-ram device designed to prevent the movement of vehicles during unauthorized entry into the territory of protected facilities by forcibly stopping the wheeled transport, including a steel base, a lifting platform, a drive shaft and a hinge mechanism, characterized in that between the base and the platform there is installed at least one torsion spring, the upper hook of each of which rests against the platform, and the lower one - against the base or the surface of the roadway or pavement.

[0005] This invention has a significant drawback, since it does not have a manual control lever attached to the drive shaft, which allows the lifting platform to be moved by manual control, including in the absence of power supply to the road blocker.

[0006] A barrier device RU 183809 U1 (published 03.10.2018) is known, designed to impede the movement of vehicles and prevent unauthorized entry of a vehicle into a prohibited area, including a support base pivotally connected to a blocking element and a drive, characterized in that it additionally contains a stop located in the support base, and the drive is made electromechanical, including an electric motor, a worm gear, a retractable rod, which is pivotally connected to the blocking element and is equipped with a mechanism for adjusting the position of the drive, made in the form of a threaded sleeve.

[0007] This invention has a significant drawback, since it does not have a manual control lever that allows the blocking element to be set in motion by manual control, including in the absence of power supply to the barrier device.

[0008] The closest technical solution to the claimed invention, chosen by the authors as a prototype, is the anti-ram barrier RU 101166 U1 (published January 10, 2011), designed to prevent unauthorized vehicle entry into a protected area. This anti-ram barrier comprises a supporting rectangular frame, to which a barrier, designed as a shield with side walls, is cantilevered via hinges and can be lifted using an electromechanical device or manually. The barrier is also equipped with a rigidly connected rotating axis, the ribbed portion of which extends outside the frame through the side wall and serves for manual control of the barrier's position using a lever.

[0009] The disadvantage of the anti-ram barrier is the unregulated method of connecting the barrier's rotating axis and the barrier's manual lifting control lever, as well as the unregulated characteristics of the materials used for the connecting parts.

[0010] The road blocker claimed by the authors includes a support base 1, a lifting platform 2, a manual control lever 3 with steel plates 4, which compress a drive shaft 5 (Fig. 1).

[0011] The aim of the invention is to obtain a road blocker that provides a reliable fastening of the manual control lever on the drive shaft for controlling the road blocker in manual mode, including in the absence of a power supply.

[0012] The technical result of the invention is achieved by a balanced selection of the technical characteristics of the materials and parts used to attach the manual control lever to the drive shaft, which ensures reliable fastening of the manual control lever to the outer end of the drive shaft due to the required number of steel compression plates of a regulated design and, as a consequence, reliable operation of the proposed design in manual mode, including in the absence of a power supply.

[0013] The technical result is achieved due to:

[0014] 1) fastening the manual control lever to the outer end of the drive shaft using at least two steel plates that clamp it;

[0015] 2) pointed projections made on the crimping steel plates, while the angles at the tops of the pointed projections are 30-60 degrees;

[0016] 3) Selecting the hardness of steel of the crimping steel plates equal to 50-60 HRC.

[0017] Fulfillment of these three conditions ensures: 1) ease of manufacture and high technological effectiveness during installation of the compression plates, uniformly covering the entire surface of the drive shaft at the point of its attachment to the manual control lever; 2) during the process of setting the lifting platform in motion using the manual control lever - the absence of both destructive deformations and abrasion of the surface of the drive shaft from the impact of the pointed protrusions of the compression plates; 3) high strength and wear resistance of the compression steel plates, which, ultimately, ensures the reliable performance of the product's primary function - the forced stop of the vehicle.

[0018] The road blocker claimed by the authors, with a manual control lever attached to the outer end of the drive shaft, operates as follows.

[0019] If the lifting platform cannot be moved by a drive, it is moved by manual force, turning a manual control lever securely attached to the outer end of the drive shaft with steel clamping plates. The sharp protrusions on the steel clamping plates, thanks to optimally selected apex angles and steel hardness, are embedded into the surface of the drive shaft, ensuring a secure attachment of the manual control lever to the drive shaft.

[0020] As a result, the manual control lever ensures reliable operation of the proposed design in manual mode, including in the absence of power supply.

[0021] The guaranteed effectiveness of the invention is achieved when the manual control lever is attached to the outer end of the drive shaft using at least two steel plates that clamp it.

[0022] If the hand control lever is fixed to the outer end of the drive shaft using a single steel plate that crimps it, the projections will not be able to cover more than half the circumference of the drive shaft, which may cause the hand control lever to slip relative to the drive shaft at the crimping point.

[0023] The guaranteed effectiveness of the invention is achieved when the angles at the tops of the pointed protrusions of the crimping steel plates are 30-60 degrees.

[0024] If the angle at the tops of the pointed protrusions that compress the steel plates is less than 30 degrees, plastic deformation of the protrusions or their brittle fracture may occur during compression as a result of interaction with the surface of the drive shaft, which may cause the manual control lever to slip relative to the drive shaft.

[0025] If the angle at the tops of the pointed protrusions that compress the steel plates is more than 60 degrees, the tops of the pointed protrusions may not penetrate into the surface of the drive shaft during compression, which in turn may cause the manual control lever to slip relative to the drive shaft.

[0026] The guaranteed effectiveness of the invention is achieved when the hardness of the steel from which the steel plates that compress the drive shaft are made is 50-60 HRC.

[0027] If the hardness of the steel from which the steel plates that compress the drive shaft are made is less than 50 HRC, then during compression, plastic deformation of the projections may occur as a result of interaction with the surface of the drive shaft, and, as a result, the lack of penetration of the projections into the surface of the drive shaft, which, in turn, may lead to unreliable fastening and slippage of the manual control lever relative to the drive shaft.

[0028] If the hardness of the steel used to make the steel plates that compress the drive shaft is more than 60 HRC, the cusps of the pointed protrusions may brittle due to the interaction with the surface of the drive shaft during compression, which may cause the manual control lever to slip relative to the drive shaft.

[0029] To ensure the required clamping force of the drive shaft, the steel plates can be tightened together by means of threaded connections.

[0030] To hold the lifting platform in the raised position, the manual control lever can be equipped with a locking mechanism.

[0031] For ease of transfer to the transport position, the manual control lever can be made folding.

[0032] For ease of use, a non-slip handle is installed at the end of the manual control lever.

[0033] Thus, the effect of the claimed parameters of the invention made it possible to achieve the claimed technical result - obtaining a road blocker, which ensures reliable fastening of the manual control lever on the drive shaft for controlling the road blocker in manual mode, including in the absence of power supply.

[0034] For testing at the Special Materials Plant of JSC NPO Spetsmaterialov, a road blocker was manufactured. It consisted of a support base 1, a lifting platform 2, a drive 3, a manual control lever 4, and a drive shaft 5 (Fig. 2). To attach the manual control lever to the road blocker's drive shaft, a series of steel compression plate samples with varying angles at the apex of the pointed protrusions and steel hardness values ​​were manufactured.

[0035] Each steel compression plate sample was made of steel with a corresponding hardness of 35, 55, and 62 HRC. The angles at the tops of the pointed protrusions were 20-30-45-60-70 degrees.

[0036] At the special materials testing center of JSC NPO Spetsmaterialov (accreditation certificate No. ROSS RU.0001.22SZ08 dated August 26, 2014), each sample was tested to determine the mean time between failures by counting the number of cycles of raising and lowering the lifting platform using the manual control lever.

[0037] The results of the tests carried out provide sufficient grounds to assert that the most effective samples were those in which the pointed projections of the compression plate at the tops had angles of 30-60 degrees, and the hardness of the steel from which the plates were made was 50-60 HRC.

[0038] The claimed technical solution for the design features of the road blocker is new, since the set of distinctive features of the invention, including in particular cases, is unknown from the literature and practical experience in this field.

[0039] The solution meets the criterion of “inventive step”, since the proposed solution does not follow clearly for a specialist from the analysis of domestic and foreign prior art.

Claims

1. A road blocker comprising a support base, a lifting platform, a drive, a manual control lever and a drive shaft, characterized in that the manual control lever is attached to the outer end of the drive shaft using at least two steel plates that clamp it and have pointed protrusions, wherein the angles at the tops of the pointed protrusions are 30-60 degrees, and the hardness of the steel from which the plates are made is 50-60 HRC.

2. A road blocker according to paragraph 1, characterized in that the steel plates are pulled together by means of threaded connections that provide the necessary clamping force for the drive shaft.

3. A road blocker according to claim 1, characterized in that the manual control lever is equipped with a locking mechanism for holding the lifting platform in a raised position.

4. A road blocker according to paragraph 1, characterized in that the manual control lever is foldable for transferring to the transport position.

5. A road blocker according to paragraph 1, characterized in that a handle made of non-slip material is installed at the end of the manual control lever.

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